The present disclosure generally relates to spaying equipment, and more particularly to high-pressure and low-pressure airless spray nozzle assemblies.
A variety of techniques are currently available for airless spray nozzle assemblies. Because airless sprayers have the characteristics of light weights and stable output pressures, the sprayers have been widely used in home finishing, building and road constructions, dock constructions and other industries. The demand is increasing both at home and abroad. The airless sprayers spray various fluid by output atomization through the spray tip. The key components for achieving atomized output are a spray tip and a saddle-shaped seal ring, which are usually sold an accessory assembly.
The spray tip needs to be closely fitted to the saddle-shaped sealing ring and fixed in a spray tip guard, which is coupled with a spray gun frame via nuts to facilitate atomized spraying.
Traditionally, the spray tip and the seal ring are precisely fitted to form a metal-to-metal hard seal, the required dimensions of the saddle-shaped semi-cylinder metal surface have to be very accurate, and the surfaces of the spray tip and the seal ring can only be seamlessly fitted by precision machining. Such process is very costly, inefficient and unreliable, which directly affects effectiveness of the atomization and normal use of the airless spray tip. Further, the airless spray tip needs to be reversed for internal cleanse between uses by turning the spray tip 180 degrees to a clean position. Thus, the spray tip and the saddle-shaped seal undergo certain amount of torque and friction, which causes the fitted surfaces to be scratched, resulting in a matching gap, and causing drips or splashes to occur during use.
Additionally, the sprayed pattern may have nonuniform diffusion due to different fluid pressure at the inlet of the passage and the fluid pressure loss at the outlet of the passage.
Thus, an airless nozzle with better sealing properties having a longer service life and a spray tip having an improved internal flow channel structure for a large range pressure fluid sprayer to produce a uniformity of the spray pattern is desired. As disclosed below, significantly improves upon the state-of-the-art, solves the above problems effectively, and enables functions that could not have been successfully performed before.
The background description provided here is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.
An airless spray nozzle includes a spray tip guard, a spray tip configured to be inserted into the spray tip guard perpendicularly to the axis of the spray tip guard, and a saddle seal assembly configured to be inserted into the spray tip guard along the axis of the spray tip guard. The saddle seal assembly includes a metal sealing sleeve and a cylindrical elastic seal. The metal sealing sleeve includes a first saddle-shaped semi-cylinder surface closely matching with an outer surface of the spray tip to form an outer hard sealing structure. The cylindrical elastic seal includes a second saddle-shaped semi-cylinder surface closely matching with the outer surface of the spray tip to form an inner flexible sealing structure. A first end portion of the cylindrical elastic seal is configured to be inserted into the metal sealing sleeve. The first saddle-shaped semi-cylinder surface and the second saddle-shaped semi-cylinder surface are configured to be spliced to form a continuous saddle-shaped semi-cylinder surface in order to seal a stepped inlet hole of the airless spray nozzle.
The saddle seal assembly may further include a metal sleeve insert attached to the inner surface of the cylindrical elastic seal to provide harder and durable inner surface to extend the service life. Additionally, the cylindrical elastic seal may further include bevels angled on its contacting surface to reduce friction between the contacting surfaces to further extend the service life of the assembly.
An airless spraying equipment includes a spray tip guard, a spray tip configured to be inserted into the spray tip guard perpendicularly to the axis of the spray tip guard, a handle arranged on one end of the spray tip, a bevel arranged on the other end of the spray tip, a retaining shoulder, a ring collar, a mounting hole having a channel axis, a pre-atomizing component, and a tip atomizing component. The pre-atomizing component and the tip atomizing component are connected to each other sequentially along the channel axis, in a fluid stream direction. The pre-atomizing component further includes a feeding channel, a pre-atomization channel, and at least two pre-atomization regulating channels. Further, the feeding channel, the pre-atomization channel, and the at least two pre-atomization regulating channel are coaxial hollow channels sequentially defined and connected along the channel axis inside the pre-atomizing component. A saddle seal assembly is configured to be inserted into the spray tip guard along the axis of the spray tip guard. The saddle seal assembly includes a metal sealing sleeve having a first saddle-shaped semi-cylinder surface closely matching with an outer surface of the spray tip to form an outer hard sealing structure, a cylindrical elastic seal having a second saddle-shaped semi-cylinder surface closely matching with the outer surface of the spray tip to form an inner flexible sealing structure, and a metal sleeve insert includes a hollow cylinder shape that matches the inner surface of the cylindrical elastic seal. In addition, a first end portion of the cylindrical elastic seal is configured to be inserted into the metal sealing sleeve. The first saddle-shaped semi-cylinder surface and the second saddle-shaped semi-cylinder surface are configured to be spliced to form a continuous saddle-shaped semi-cylinder surface, to thereby seal a stepped inlet hole of the high-pressure airless spray nozzle. The metal sleeve insert is attached onto the inner surface of the cylindrical elastic seal.
Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims, and the drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.
The present disclosure will become more fully understood from the detailed description and the accompanying drawings.
In the drawings, reference numbers may be reused to identify similar and/or identical elements.
The present disclosure describes an airless spray nozzle assembly that has the following enhanced outcomes: for example, 1) greatly increases the production efficiency and reduces production costs for saddle seal assembly by combining a soft sealing structure with a hard sealing structure; 2) improves sealing effect and extends the seal’s service life; 3) lowers the requirement for manufacturing measurement precision; 4) allows more convenient operation without a tool; and 5) produces a uniform spraying pattern and eliminates streaks of spraying fluid deposits formed at or near the edges of the sprayed area. As such, the spraying fluid can be uniformly applied to the surface of the workpiece, with no obvious fringe, therefore greatly improves the coating quality.
The internal structure of a traditional typical spray tip flow channel includes two parts, a first part being a spraying fluid feed channel and a second part being a spraying fluid atomizing component. The inside of the spraying fluid feed channel is a general circular through hole, which serves to guide the flow of the spraying fluid. The spraying fluid is transmitted to the chamber of the spraying fluid atomizing component, then enters an outlet passage of the spraying fluid atomizing component, and finally passes through a tip outlet orifice with a wedge-shaped cut to produce an atomized spray.
Since this structure does not produce spray fluid turbulence in the spraying fluid feed channel, the net pressure loss of the spraying fluid at the outlet orifice is significant. In other words, the output pressure at the outlet orifice and the input pressure at the inlet of the spraying fluid feed channel are quite different. The spraying pressure cannot produce uniform atomization, causing more spray fluid deposited at or near the edge of a spray pattern. This results in streaks on the edges of the pattern, and the distribution of the paint is uneven, as shown in
The problem of non-uniformity of the spray pattern (especially under low pressure conditions) can be solved by changing the internal flow channel structure of the spray tip.
Various embodiments and examples are disclosed in the present disclosure to illustration the solution.
As shown in
Specifically,
The one or more diverging tip guard members 1c are configured to support the spray tip 2 and keep the spray tip 2 from touching the ground. The one or more diverging tip guard members can also serve as carrying handles when the spray tip 2 is not in use. The one or more diverging tip guard members 1c are configured to be connected to the outside of the wear-resistant inner sleeve 8.
Additionally, a horizontal hole 1a is opened/defined in an axial direction of the spray tip guard 1. One end of the horizontal hole 1a is an inlet, and the other end is an outlet. A vertical hole 1b, which joins with the horizontal hole 1a, is opened/defined in a radial direction of the spray tip guard 1.
As shown in
The metal sealing sleeve 5 is disposed inside the horizontal hole 1a and located close to the inlet end of the horizontal hole 1a. The metal sealing sleeve 5 further includes a saddle-shaped semi-cylinder surface 5a on the side close to the spray tip 2 and configured to match/fit with the outer surface of the spray tip 2 with end C of the metal sealing sleeve 5. The airless nozzle 10 further includes the cylindrical elastic seal 6 configured to be inserted into the metal sealing sleeve 5 with end A of the cylindrical elastic seal 6, extended beyond the saddle-shaped semi-cylinder surface 5a, having a saddle-shaped semi-cylinder surface 6a match/fit with the outer surface of the spray tip 2. When the saddle-shaped semi-cylinder surface 6a seals one end of the stepped inlet hole 2a, the saddle-shaped semi-cylinder surface 5a and the saddle-shaped semi-cylinder surface 6a are spliced (combined) to form a continuous saddle-shaped semi-cylinder surface, which seals the stepped inlet hole 2a. In other words, the saddle-shaped semi-circular surface 5a serves as a preliminary seal, and the saddle-shaped semi-cylinder surface 6a serves as a complemental seal to further prevent leakage.
The airless nozzle design according to the present disclosure greatly improves parts production efficiency and reduces the production cost by combining a flexible sealing structure and a hard sealing structure. The saddle-shaped semi-cylinder surface 5a closely matching/fitting with the outer surface of the spray tip 2 forms an outer hard sealing structure. The saddle-shaped semi-cylinder surface 6a closely matching/fitting with the outer surface of the spray tip 2 forms an inner flexible sealing structure.
Specifically, the connection hole of the wear-resistant inner sleeve 8 is hard sealed with the spray tip 2. When the spray tip guard 1 is screwed onto the connecting tube 3b of the spray gun 3 by the mounting nut 1d, the connecting end 3a of the spray gun 3 pushes back the saddle seal assembly 4 into close contact with the spray tip 2. The preliminary seal provided by the saddle-shaped semi-circular surface 5a is a hard seal while the seal between the saddle-shaped semi- cylinder surface 6a and the spray tip 2 is a soft seal.
In addition, the outer surface of the metal sealing sleeve 5 is in close contact with the inner surface of the horizontal hole 1a. When the wear-resistant inner sleeve 8 is used, the metal sealing sleeve 5 is placed inside the wear-resistant inner sleeve 8 and is hard sealed with the inner surface of the wear-resistant inner sleeve 8.
During the mounting process, the cylindrical elastic seal 6 is pressed by the connecting end face 3a. Since the cylindrical elastic seal 6 has a tendency to move toward the spray tip 2, the saddle-shaped semi-cylinder surface 6a can maintain a close contact with the outer surface of the spray tip 2 to achieve a good seal.
The spray tip 2 may include a cylinder-shaped structure, which has a bevel 2f on one end and a handle 2b on the other end. The cylinder-shaped structure further includes a retaining shoulder 2d and a tip ring collar 2c located close to the end connecting with the handle 2b. The spray tip 2 needs to be rotated 180 degrees to be cleansed. The tip ring collar 2c interferes with the frontend surface of the diverging tip guard members 1c during the rotation of the spray tip 2 to thereby limit the rotation range of the spray tip 2. As such, the step inlet hole 2a turns to the front of the spray tip guard to be at the outlet position. The tip ring collar 2c is designed to increase grip to make mounting and rotating spray tip 2 easier.
The spray tip 2 often needs to be rotated for being cleansed. The rotating torque causes wearing off the surface of the spray tip 2 and the saddle-shaped semi-cylinder surface 6a. The cylindrical elastic seal 6 can compensate to the sealing surface because of its elasticity even after the contacting surfaces are worn off. As such, the sealing effect is maintained and the service life of the seal is extended.
The sealing structure mainly relies on the deformation of the cylindrical elastic seal 6 to form a close fit with the surface of the spray tip 2′s stepped inlet hole 2a. Accordingly, the required dimensional precision of the manufacturing process is greatly reduced to thereby greatly improve parts production efficiency and reduce the production cost.
Because the cylindrical elastic seal 6 has some deformation elasticity, the spray tip guard seal 1 can be hand-fastened by a user without the help of a tool (e.g., a wrench, etc.).
Additionally, and/or alternatively, a ring collar 6b is disposed on the cylindrical elastic seal 6 at end B. The ring collar 6b abuts against the end D of the metal sealing sleeve 5. End B of the cylindrical elastic seal 6 is away from where the cylindrical elastic seal 6 is inserted into the metal sealing sleeve 5. End D of the metal sealing sleeve 5 is away from the saddle-shaped semicircular surface 5a. The purpose of the ring collar 6b is to prevent the metal sealing sleeve 5 from coming off cylindrical elastic seal 6, thereby improving the assembly structural strength and stability.
The cylindrical elastic seal 6 with a circumferential positioning structure further includes an inner coupling plane 6c configured to be disposed between the metal sealing sleeve 5 and the cylindrical elastic seal 6. One end of the inner coupling plane 6c is adapted to be inserted into the metal sealing sleeve 5.
The purpose of the inner coupling plane 6c is to prevent the metal sealing sleeve 5 from rotating relative to the cylindrical elastic seal 6 and to avoid a gap between the saddle-shaped semi-cylinder surface 6a and the outer surface of the spray tip 2.
The cylindrical elastic seal 6 is nestled inside the metal sealing sleeve 5 to form the saddle seal assembly 4 by fitting the inner surface of the metal sealing sleeve 5 with the outer surface of the cylindrical elastic seal 6. The outer surface of the saddle seal assembly 4 is fitted with the inner surface of the horizontal hole 1a (i.e., the outer surface of the metal sealing sleeve 5 is fitted with the inner surface of the horizontal hole 1a and the ring collar 6b is fitted with the inner surface of the horizontal hole 1a).
The overall tight sealing structure effectively prevents dripping and splashing in actual use.
The metal sealing sleeve 5 with a circumferential positioning structure further includes at least one outer coupling plane 5b disposed on the inner surface of the metal sealing sleeve 5. The inner coupling plane 6c is fitted with the outer coupling plane 5b and is disposed at end A of the cylindrical elastic seal 6. End A of the cylindrical elastic seal 6 is adapted to be inserted into the metal sealing sleeve 5. The circumferential positioning structure prevents circumferential rotation and makes installation easier.
Additionally, and/or alternatively, two inner fitting planes 6c may be symmetrically arranged and two outer fitting planes 5b may be symmetrically arranged. The two inner fitting planes 6c and the two outer fitting planes 5b are configured to be matched each other respectively.
Alternatively, the circumferential positioning structure may include other shapes. For example, a non-circular hole may be defined inside the metal sealing sleeve 5, and the end portion of the cylindrical elastic seal 6 configured to be inserted into the metal sealing sleeve 5 may be shaped to match/fit the non-circular hole.
Additionally, the circumferential positioning structure further includes a retaining step 7 disposed at the end of the horizontal hole 1a closer to the inlet, and a positioning surface 5c disposed at the end C of the metal sealing sleeve 5. The positioning surface 5c abuts against the retaining step 7. As such, the metal sealing sleeve 5 is prevented from moving too close to the spray tip 2, thereby avoiding excessive wear between the metal sealing sleeve 5 and the spray tip 2. The sealing between the metal sealing sleeve 5 and the spray tip 2 is thus maintained, and the service life of the overall structure is extended.
The design of including the positioning surface 5c further strengthens and avoids radial deformation of the structure of the airless spray nozzle assembly.
The circumferential positioning structure prevents the metal sealing sleeve 5 from moving excessively close to the spray tip 2, and thus reduces the wear caused by excessive contact between the metal sealing sleeve 5 and the spray tip 2.
As shown in
The cylindrical elastic seal 6 can be made of, for example, nylon, or rubber, or any other elastic materials etc.
The above configuration reduces the wear caused by contacts between the metal sealing sleeve 5 and the inner surface of the horizontal hole 1a, thereby helping the soft sealing structure of the cylindrical elastic seal 6 to be more effective.
Further,
The wear-resistant inner sleeve 8 prevents sealing from deterioration caused by the wear between the spray tip 2 and the wear-resistant inner sleeve 8, thereby extending its service life.
The production efficiency of the airless spray nozzle assembly disclosed herein is greatly increased and the production costs of which is greatly reduced by combining a soft sealing structure and a hard sealing structure.
Because the elastic sealing design requires lower machining precision of the cylindrical elastic seal 6, the cylindrical elastic seal 6 may be injection molded in its entirety. As such, the manufacturing process has much higher production capacity and much lower processing costs than that of a mechanical machining process.
The cylindrical elastic seal 6′ includes a first bevel 6′e and a second bevel 6′f. The beveled cylindrical elastic seal 6′ is angled on its contacting surface to reduce contacting areas to thereby reduce friction between the contacting surfaces. For example, during assembly process of inserting the cylindrical elastic seal 6′ into the metal sealing sleeve 5, the contacting surface with the second bevel 6′f is pressed onto the end D of the metal sealing sleeve 5, with smaller contacting area and less friction. It takes longer for the components to wear off, and thus the service life of the assembly is further extended. Further, the pressure is now applied to a smaller area, thereby decreasing the deformation. As such, the saddle seal assembly 4′ with the improved cylindrical elastic seal 6′ is more durable.
Additionally, the saddle seal assembly 4′ includes a metal sleeve insert 7′ that is configured to be attached onto the inner surface 6′g of the cylindrical elastic seal 6′. Similar to the cylindrical elastic seal 6 of the saddle seal assembly 4, the cylindrical elastic seal 6′ can be made of, for example, plastic, nylon, rubber, or any other elastic materials. The airless sprayers spray various fluid through the saddle seal assembly 4′ before atomization through the spray tip. The inner surface 6′g of the cylindrical elastic seal 6′ can be worn off over time by such fluid spray. The metal sleeve insert 7′ generally includes a hollow cylinder shape that matches the inner surface 6′g of the cylindrical elastic seal 6′, and is attached to the inner surface 6′g of the cylindrical elastic seal 6′ to provide a much harder inner surface than those made of elastic materials. As such, the improved structure can significantly extend the service life of the saddle seal assembly 4′.
The metal sleeve insert 7′ can be made of any conventionally processed metal, such as stainless steel, which has a good corrosion resistance and is cost-effective. The metal sleeve insert 7′ can be, for example, press fit, seamlessly interference fit, or glued onto the inner surface 6′g of the cylindrical elastic seal 6′. The cylindrical elastic seal 6′ attached with the metal sleeve insert 7′ can be used as one component. A test has shown that the saddle seal assembly 4′ has increased the service life to 5 times longer than that of the saddle seal assembly 4 without the attached metal sleeve insert 7′.
Similar to connecting the spray gun 3 with the saddle seal assembly 4, the connecting end 3a of the spray guy 3 also can push the saddle seal assembly 4′ into close contact with the spray tip 2. Now that the first bevel 6′e is angled on the contacting surface of the cylindrical elastic seal 6′ with the spray tip 2, the close contacting area is also reduced with the angled bevel 6′e. As such, the friction between the contacting surfaces is reduced during the mounting process when the saddle seal assembly 4′ is pressed toward the spray tip 2, to thereby further extend the service life while maintaining the sealing effectiveness.
As shown in
The tip atomizing component 30 includes a turbulence chamber 3′a, an outlet passage 3′d, and an outlet orifice 3′e that are coaxially defined and sequentially connected along the channel axis X inside the tip atomizing component 30. The turbulence chamber 3′a is a cylindrical cavity. Additionally, a frustoconical passage 3′c is arranged between the turbulence chamber 3′a and the outlet passage 3e. The frustoconical passage 3′c and the turbulence chamber 3′a are coaxial. The outlet passage 3′e is a cylindrical passage that extends from the turbulence chamber 3′a to the outlet orifice 3′e.
Furthermore, as shown in
As shown in
As such, the fluid having flown through the feeding channel 2′a may be compressed when flowing through the narrow cylindrical pre-atomization channel 2′b and its flowing speed is increased. When the fluid flows through the two frustoconical shaped pre-atomization regulating channels 2′c and 2′d. The outlet of the feeding channel 2′a is connected to the small inlet of the frustoconical shaped pre-atomization regulating channel 2′c, and the large outlet of the pre-atomization regulating channel 2′c is then connected to the large inlet of the frustoconical shaped pre-atomization regulating channel 2′d, and the small outlet of the pre-atomization regulating channel 2′d is sequentially connected to the wide cylindrical pre-atomization regulating channel 2′e with a uniform or a tapered diameter. As such, quickly changing the passage diameter from small to large, the pressure of the fluid can be quickly released and the fluid achieves stabilized pre-atomization. The fluid particles going through the pre-atomizing regulating channels 2′c and 2′d are violently mixed through the pre-atomization process, forming a turbulent fluid in disordered motions to reduce the net pressure loss of the fluid and refine the fluid particles. The fluid can be further regulated or stabilized when flowing through the wide cylindrical pre-atomization regulating channel 2′e.
Accordingly, the spray tip with such structure can operate well at a pressure of 800-3000 psi, which covers at least 50% lower than the normal operating pressure of a airless sprayer in today’s market, such as 2000 psi to 3000 psi. The example tip atomizing component 30 can have a spray angle 40 shown in
In addition, the spray tip that operates well at low pressure can save paint by half, increase the working lifespan by at least 50%, can meanwhile resolve the issue of overspraying. Furthermore, the working fluid particles are appropriately refined through the pre-atomization process, which promotes the uniformity of the spray pattern.
Having pre-atomization channels with small dimension significantly improves compression of working fluids. Manufacturing such parts are normally done by powder pressing (PM) or metal injection molding (MIM).
Alternatively, in some other embodiments of the pre-atomizing component 20, as shown in
The fluid enters the feeding channel 2′a through an upstream feeding entry. The feeding channel 2′a with the feed turbulence thread 2′a1 on its inner surface may increase the disturbance of the fluid to form a vortex that forces the fluid to rotate towards the upstream along the internal surface of the pre-atomization channel 2′b. As such, the mass flow rate is increased and the net pressure loss of the fluid is also reduced. Specifically, the fluid is propelled by a swirling force against the internal surface of the internal thread groove of the feed turbulence thread 2′a1 to thereby reducing the mass flow rate and the net pressure loss of the working fluid.
Additionally, the number of turns of the feed turbulent thread 2′a1 can be increased or decreased according to the length of the feeding channel 2′a, which is a first-stage turbulent chamber for the fluid flowing downstream. Specifically, the number of turns of the feed turbulent thread 2′a1 may depend on the thread pitch and the relevant specifications that influence the thread turns. For example, smaller number of turns of the feed turbulent thread 2′a1 may be configured for the feeding channel 2′a having steeper pitch threads but same length. Bigger number of turns of the feed turbulent thread 2′a1 may be configured for the feeding channel 2′a having same pitch threads but greater length.
In some alternative embodiments,
These spare pre-atomizing components are configured to regulate before atomize the fluid. For example, the fluid having flown from the feeding channel 2a′a may be regulated/agitated when flowing into the wide pre-atomization regulating channel 2a′b and its flowing speed is decreased. The fluid is then compressed when flowing into the frustoconical shaped pre-atomization channels 2a′c via its small inlet and out from its large outlet. Such structure is designed for fluid with high consistency as fluid with high consistency can be fully agitated before atomization to decrease pressure loss.
The diameter of the feeding channel 2a′a is about 1.5 mm - 5 mm. The diameter of the pre-atomization regulating channel 2a′b is about 3 mm - 5 mm. The small inlet diameter of the pre-atomization channel 2a′c is about 0.4 mm - 0.8 mm, and the large outlet diameter of the pre-atomization channel 2a′c is about 2.0 mm - 4.0 mm.
The diameter of the feeding channel 2b′a is about 1.5 mm - 5 mm. The diameter of the pre-atomization regulating channel 2b′b is about 3 mm - 5 mm. The diameter of the pre-atomization channel 2b′e is about 1 mm - 2 mm. The small inlet diameter of the pre-atomization channel 2a′c is about 0.4 mm - 0.8 mm, and the large outlet diameter of the pre-atomization channel 2a′c is about 2.0 mm - 4.0 mm.
The diameter of the feeding channel 2c′a is about 1.5 mm - 5 mm. The diameter of the pre-atomization regulating channel 2c′b is about 3 mm - 5 mm. The small inlet diameter of the pre-atomization channel 2c′c is about 0.4 mm - 0.8 mm, and the large outlet diameter of the pre-atomization channel 2c′c is about 2.0 mm - 4.0 mm.
Additionally, a washer 2a′f can be arranged between the feeding channel 2a′a and the pre-atomization channel 2a′c; a washer 2b′f can be arranged between the pre-atomization regulating channel 2b′b and the pre-atomization channel 2b′c; and two washers 2c′f can be arranged at both ends of the pre-atomization channel 2c′c for tightly fitted structures. Washers 2a′f, 2b′f, and 2c′f may have various sizes of thickness. Specifically, the two washers 2c′f in the pre-atomizing component 20c of
Similar to the example spray tip 2′ of
Firstly, whether spraying with an electric spray gun or an airless sprayer, the spraying equipment can diffuse the spray pattern uniformly during high and low pressure spraying, thereby applying the spray fluid uniformly to the surface of the workpiece and eliminating the streaks of spray fluid deposits formed at or near the edges, which greatly improves the coating quality.
Secondly, the use of spraying equipment can also significantly extend the lifespan of the sprayer. The higher the pressure, the greater the friction, and the lower the service life, and vice versa. For example, when the high-pressure airless sprayer uses the current inventive spray tip, the working pressure can be reduced by at least one-half compared to the use of conventional high-pressure spray tips, therefore, the service life of the sprayer can be almost doubled. It also solves the problem of overspray of the spray fluid.
Thirdly, the spray pattern of the spray tip of the current invention has the characteristics of high density in the middle and uniform dilution on both edges. As such, during continuous spraying, two adjacent thin edges are overlapped to form substantially the same density as the middle portion, which greatly reduces the difficulty of splicing adjacent painting areas, and therefore improves the aesthetics of the coating.
Lastly, the current invention realizes a secondary atomization by improving the internal flow channels, so that the particles of the sprayed fluid after atomization are further refined than the conventional low-pressure and high-pressure spray tips, which further improves the aesthetics of the coating.
The above spray tip design, whether spraying with an electric spray gun or an airless sprayer, with spraying pressure at a wide range of 800-3000 psi can diffuse the spray pattern uniformly during a wide range pressure spraying. Accordingly, the disclosed example spraying equipment can apply the spray fluid uniformly to the surface of the workpiece, eliminate the streaks of spray fluid deposits formed at or near the edges, and greatly improves the coating quality.
In addition, the present spray tip design can substantially extend the lifespan of the sprayer. The higher operating pressure usually wears down the spray tip faster. For example, the presented disclosed spray tip can operate well at a pressure of 1000 psi and lower, which is at least 50% lower than the normal operating pressure of a high-pressure airless sprayer in today’s market, such as 2000 psi to 3000 psi. As such, the spray tip according to the present disclosure can increase the working lifespan by at least 50%, can meanwhile resolve the issue of overspraying.
The foregoing description is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. The broad teachings of the disclosure can be implemented in a variety of forms. Therefore, while this disclosure includes particular examples, the true scope of the disclosure should not be so limited since other modifications will become apparent upon a study of the drawings, the specification, and the following claims. It should be understood that one or more steps within a method may be executed in different order (or concurrently) without altering the principles of the present disclosure. Further, although each of the embodiments is described above as having certain features, any one or more of those features described with respect to any embodiment of the disclosure can be implemented in and/or combined with features of any of the other embodiments, even if that combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and permutations of one or more embodiments with one another remain within the scope of this disclosure.
Spatial and functional relationships between elements (for example, between modules, circuit elements, semiconductor layers, etc.) are described using various terms, including “connected,” “engaged,” “coupled,” “adjacent,” “next to,” “on top of,” “above,” “below,” and “disposed.” Unless explicitly described as being “direct,” when a relationship between first and second elements is described in the above disclosure, that relationship can be a direct relationship where no other intervening elements are present between the first and second elements, but can also be an indirect relationship where one or more intervening elements are present (either spatially or functionally) between the first and second elements.
As used herein, the phrase at least one of A, B, and C should be construed to mean a logical (A OR B OR C), using a non-exclusive logical OR, and should not be construed to mean “at least one of A, at least one of B, and at least one of C.” The term subset does not necessarily require a proper subset. In other words, a first subset of a first set may be coextensive with (equal to) the first set.
In the figures, the direction of an arrow, as indicated by the arrowhead, generally demonstrates the flow of information (such as data or instructions) that is of interest to the illustration. For example, when element A and element B exchange a variety of information but information transmitted from element A to element B is relevant to the illustration, the arrow may point from element A to element B. This unidirectional arrow does not imply that no other information is transmitted from element B to element A. Further, for information sent from element A to element B, element B may send requests for, or receipt acknowledgements of, the information to element A.
In this application, including the definitions below, the term “module” or the term “controller” may be replaced with the term “circuit.” The term “module” may refer to, be part of, or include: an Application Specific Integrated Circuit (ASIC); a digital, analog, or mixed analog/digital discrete circuit; a digital, analog, or mixed analog/digital integrated circuit; a combinational logic circuit; a field programmable gate array (FPGA); a processor circuit (shared, dedicated, or group) that executes code; a memory circuit (shared, dedicated, or group) that stores code executed by the processor circuit; other suitable hardware components that provide the described functionality; or a combination of some or all of the above, such as in a system-on-chip.
The module may include one or more interface circuits. In some examples, the interface circuit(s) may implement wired or wireless interfaces that connect to a local area network (LAN) or a wireless personal area network (WPAN). Examples of a LAN are Institute of Electrical and Electronics Engineers (IEEE) Standard 802.11-2016 (also known as the WIFI wireless networking standard) and IEEE Standard 802.3-2015 (also known as the ETHERNET wired networking standard). Examples of a WPAN are the BLUETOOTH wireless networking standard from the Bluetooth Special Interest Group and IEEE Standard 802.15.4.
The module may communicate with other modules using the interface circuit(s). Although the module may be depicted in the present disclosure as logically communicating directly with other modules, in various implementations the module may actually communicate via a communications system. The communications system includes physical and/or virtual networking equipment such as hubs, switches, routers, and gateways. In some implementations, the communications system connects to or traverses a wide area network (WAN) such as the Internet. For example, the communications system may include multiple LANs connected to each other over the Internet or point-to-point leased lines using technologies including Multiprotocol Label Switching (MPLS) and virtual private networks (VPNs).
In various implementations, the functionality of the module may be distributed among multiple modules that are connected via the communications system. For example, multiple modules may implement the same functionality distributed by a load balancing system. In a further example, the functionality of the module may be split between a server (also known as remote, or cloud) module and a client (or, user) module.
Some or all hardware features of a module may be defined using a language for hardware description, such as IEEE Standard 1364-2005 (commonly called “Verilog”) and IEEE Standard 1076-2008 (commonly called “VHDL”). The hardware description language may be used to manufacture and/or program a hardware circuit. In some implementations, some or all features of a module may be defined by a language, such as IEEE 1666-2005 (commonly called “SystemC”), that encompasses both code, as described below, and hardware description.
The term code, as used above, may include software, firmware, and/or microcode, and may refer to programs, routines, functions, classes, data structures, and/or objects. The term shared processor circuit encompasses a single processor circuit that executes some or all code from multiple modules. The term group processor circuit encompasses a processor circuit that, in combination with additional processor circuits, executes some or all code from one or more modules. References to multiple processor circuits encompass multiple processor circuits on discrete dies, multiple processor circuits on a single die, multiple cores of a single processor circuit, multiple threads of a single processor circuit, or a combination of the above. The term shared memory circuit encompasses a single memory circuit that stores some or all code from multiple modules. The term group memory circuit encompasses a memory circuit that, in combination with additional memories, stores some or all code from one or more modules.
The term memory circuit is a subset of the term computer-readable medium. The term computer-readable medium, as used herein, does not encompass transitory electrical or electromagnetic signals propagating through a medium (such as on a carrier wave); the term computer-readable medium may therefore be considered tangible and non-transitory. Non-limiting examples of a non-transitory computer-readable medium are nonvolatile memory circuits (such as a flash memory circuit, an erasable programmable read-only memory circuit, or a mask read-only memory circuit), volatile memory circuits (such as a static random access memory circuit or a dynamic random access memory circuit), magnetic storage media (such as an analog or digital magnetic tape or a hard disk drive), and optical storage media (such as a CD, a DVD, or a Blu-ray Disc).
The apparatuses and methods described in this application may be partially or fully implemented by a special purpose computer created by configuring a general purpose computer to execute one or more particular functions embodied in computer programs. The functional blocks and flowchart elements described above serve as software specifications, which can be translated into the computer programs by the routine work of a skilled technician or programmer.
The computer programs include processor-executable instructions that are stored on at least one non-transitory computer-readable medium. The computer programs may also include or rely on stored data. The computer programs may encompass a basic input/output system (BIOS) that interacts with hardware of the special purpose computer, device drivers that interact with particular devices of the special purpose computer, one or more operating systems, user applications, background services, background applications, etc.
The computer programs may include: (i) descriptive text to be parsed, such as HTML (hypertext markup language), XML (extensible markup language), or JSON (JavaScript Object Notation), (ii) assembly code, (iii) object code generated from source code by a compiler, (iv) source code for execution by an interpreter, (v) source code for compilation and execution by a just-in-time compiler, etc. As examples only, source code may be written using syntax from languages including C, C++, C#, Objective-C, Swift, Haskell, Go, SQL, R, Lisp, Java®, Fortran, Perl, Pascal, Curl, OCaml, Javascript®, HTML5 (Hypertext Markup Language 5th revision), Ada, ASP (Active Server Pages), PHP (PHP: Hypertext Preprocessor), Scala, Eiffel, Smalltalk, Erlang, Ruby, Flash®, Visual Basic®, Lua, MATLAB, SIMULINK, and Python®.
Number | Date | Country | Kind |
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201810418572.X | May 2018 | US | national |
This application is a continuation in part application of U.S. Patent Application No. 17/396,969, which was filed on Aug. 9, 2021 and which claims the benefit of U.S. Patent Application No. 16/279,653, which was filed on Feb. 19, 2019 and which claims the benefit of Chinese Patent Application 201810418572.X, filed May 4, 2018. The entire disclosures of the applications referenced above are incorporated by reference.
Number | Date | Country | |
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Parent | 17396969 | Aug 2021 | US |
Child | 18199869 | US | |
Parent | 16279653 | Feb 2019 | US |
Child | 17396969 | US |