Patent Application
20160339458
1. Field of the Invention
The present invention relates to spray gun technology and more particularly, to an improved structure of gyrating nozzle spray gun, which comprises a grip, an attachment tube connected to the grip, and a gyrating nozzle head connected to the attachment tube and holding a rotator in a bearing inside an end cap thereof for ejecting compressed air in a spiral pattern.
2. Description of the Related Art
With advances in technology, all aspects of the quality of our lives have been continuously improving. In transportation, cars and motorcycles are widely used by people as personal transportable vehicles. The number of cars and motorcycles keeps increasing. Many automatic washing machines are commercially available for washing cars and motorcycles. These automatic washing machines commonly use rotating brushes for cleaning cars. Cleaning a car with rotating brushes cannot effectively remove stains and dirt from the edges, or convex and concave portions of the body of the car. Some people would wash their car manually with clean water, and then wipe off residual water stains from the body of the car with a dry cloth. However, cleaning a car in this manner is labor intensive and time consuming.
In the implementation of a general cleaning work, people normally will apply a flow of water to the surface of the object to be cleaned and simultaneously wipe the surface of the object with a brush or cloth. When cleaning a car or a building, it is necessary to apply a strong jet of water to the surface to be cleaned and then to wipe the surface with a brush or cloth. For ejecting a strong jet of water onto the surface to be cleaned, people normally will attach a water hose to a water tap and squeeze the terminal end of the water hose with the fingers, causing water to be ejected out of the terminal end of the water hose onto the surface to be cleaned. After washing the surface with jets of water, a brush or cloth is then used to clean the washed surface. This cleaning method is time-consuming and wastes a large amount of water, and therefore, it does not meet the demands of energy and water saving. In order to improve the problem of waste of water resources, some designs are created to combine the use of high-pressure air with a water gun for strengthening the force of water scour and controlling the time of water consumption, avoiding causing a huge loss of water. As illustrated in
Therefore, it is desirable to provide a gyrating nozzle spray gun that eliminates the problem of rubbing between the gyrating nozzle and the inside wall of the horn-shaped barrel and the problem of breaking risk of the gyrating tube during operation.
The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide an improved structure of gyrating nozzle spray gun, which comprises a grip, an attachment tube connected to the grip, and a gyrating nozzle head connected to the attachment tube and holding a rotator in a bearing inside an end cap thereof for ejecting compressed air in a spiral pattern, and thus, the invention eliminates the problem of rubbing between component parts and the problem of breaking risk of the gyrating tube during operation as seen in the prior art design.
In one embodiment of the present invention, the improved structure of gyrating nozzle spray gun comprises a grip that comprises a trigger-controlled valve seat, an attachment tube connected to the valve seat of the grip, and a gyrating nozzle head mounted on the attachment tube. The gyrating nozzle head comprises a connection nut threaded onto the attachment tube, an end cap threaded onto the connection nut, a bearing positioned in an accommodation open chamber of the end cap, and a rotator mounted in the accommodation open chamber of the end cap and rotatable with the inner race of the bearing relative to the end cap. When operating the trigger of the grip to open the valve seat, compressed air is guided from an external high-pressure air source through an air inlet of the grip into the attachment tube and the gyrating nozzle head and then forced out of an oblique jet hole in the rotator of the gyrating nozzle head, and thus, a swirling flow of compressed air is ejected out of the spray gun.
In an alternate form of the present invention, the rotator further comprises a through hole located in the front side thereof. Further, the attachment tube is a T-shaped three-way tube, comprising a bottom connection tube located at a bottom side thereof and mounted with a water tank, a dip tube connected to the bottom connection tube and inserted into the water tank for sucking a fluid (such as clean water, cleaning solution, soapy water or water wax) from the water tank into the bottom connection tube, a water-supply tube connected to the bottom connection tube in communication with the dip tube and inserted into the gas-delivery hole of the attachment tube, the through hole of the connection nut and the plenum chamber of the rotator and terminating in a water outlet tip that is inserted into the through hole in the front side of the rotator. Further, the diameter of the through hole of the rotator is larger than the outer diameter of the water outlet tip so that an annular gap is defined in the through hole of the rotator around the water outlet tip for the passing of compressed air. Thus, when a swirling flow of compressed air is ejected out of the oblique jet hole of the gyrating nozzle, and simultaneously ejected out of the annular gap in the through hole around the water outlet tip, a flow of fluid is sucked into the bottom connection tube of the attachment tube and ejected out of the water outlet tip of the water-supply tube, and the fluid being ejected out of the water outlet tip is then turned into a mist, compressed air is simultaneously ejected out of the oblique jet hole, making the mist finer.
Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure.
Referring to
The grip 1 comprises an air inlet 11 located at a bottom side thereof, a valve seat 12 located at a top side thereof, and a trigger 13 operable to open the valve seat 12 for letting an outer compressed flow of air go through the air inlet 11 into the valve seat 12 toward an air outlet 121 of the valve seat 12.
The attachment tube 2 comprises a mating connection end piece 21 located at one end thereof, a mating connection screw rod 22 located at an opposite end thereof, and a gas-delivery hole 20 axially extending through the mating connection end piece 21 and the mating connection screw rod 22.
The gyrating nozzle head 3 comprises a connection nut 31, an end cap 32 fastened to the connection nut 31, and a rotator 33 and a bearing 34 movably mounted in the end cap 32. The connection nut 31 comprises a through hole 310 extending through opposing front and rear sides thereof, a screw hole 311 located in the rear side within the through hole 310, and an outer thread 312 extending around the periphery of the front side. The end cap 32 comprises an accommodation open chamber 320, an inner thread 321 located in one side of the accommodation open chamber 320 and threaded onto the outer thread 312 of the connection nut 31, and an opening 322 located in an opposite side of the accommodation open chamber 320. The rotator 33 is accommodated in the accommodation open chamber 320 of the end cap 32, comprising a recessed plenum chamber 330, an oblique jet hole 331 eccentrically and obliquely located at the front wall 334 in communication with the plenum chamber 330, a radial stop flange 332 formed around the plenum chamber 330 and a circular peripheral stop wall 333 located on the front surface of the radial stop flange 332. The bearing 34 is mounted in the accommodation open chamber 320 of the end cap 32 around the rotator 33 and stopped at the radial stop flange 332 of the rotator 33 with the inner race 340 thereof abutted against the circular peripheral stop wall 333 of the rotator 33. Thus, after the outer race of the bearing 34 is positioned in the accommodation open chamber 320 of the end cap 32, the front wall 334 of the rotator 33 is rotatably inserted into the opening 322 of the end cap 32 with the oblique jet hole 331 facing toward the outside of the end cap 32, and the rotator 33 can then be rotated with the inner race 340 of the bearing 34 in the accommodation open chamber 320 of the end cap 32.
In installation of the gyrating nozzle spray gun, the air inlet 11 of the grip 1 is connected to an external high-pressure air source (such as air compressor), and then, the mating connection end piece 21 of the attachment tube 2 is connected to the air outlet 121 of the valve seat 12 of the grip 1, and then a gasket ring 221 is attached to the tubular mating connection screw rod 22 of the attachment tube 2, and then the screw hole 311 of the connection nut 31 of the gyrating nozzle head 3 is threaded onto the tubular mating connection screw rod 22 of the attachment tube 2 and stopped against the gasket ring 221 tightly to seal the gap in the connection between the connection nut 31 and the tubular mating connection screw rod 22 and to keep the through hole 310 of the connection nut 31 and the plenum chamber 330 of the rotator 33 in line and communication with the gas-delivery hole 20 of the attachment tube 2. Thus, the grip 1, the attachment tube 2 and the gyrating nozzle head 3 are assembled to constitute the gyrating nozzle spray gun of the present invention. When a flow of high-pressure air is delivered through the air inlet 11 of the grip 1 and the air outlet 121 of the valve seat 12 into the gas-delivery hole 20 of the attachment tube 2 and the plenum chamber 330 of the rotator 33, the running flow of high-pressure air will be accumulated in the plenum chamber 330 of the air rotator 33 and forced out of the oblique jet hole 331, and the rotator 33 will be simultaneously forced by the running flow of high-pressure air to rotate with the inner race 340 of the bearing 34 in the end cap 32.
In actual application of the gyrating nozzle spray gun, the user can operate the trigger 13 of the grip 1 to open the valve seat 12, enabling a flow of high-pressure air to be delivered from the external high-pressure air source through the air inlet 11 of the grip 1 and the air outlet 121 of the valve seat 12 into the gas-delivery hole 20 of the attachment tube 2, the through hole 310 of the connection nut 31 and then the plenum chamber 330 of the rotator 33. When the running flow of high-pressure air is being delivered into the plenum chamber 330 of the air rotator 33, it will be accumulated in the plenum chamber 330 of the air rotator 33 and forced out of the oblique jet hole 331. Because the oblique jet hole 331 is eccentrically and obliquely located at the front wall 334 and the bearing 34 is supported on the radial stop flange and circular peripheral stop wall 333 of the rotator 33, when the high-pressure air is accumulated in the plenum chamber 330 of the air rotator 33 and forced out of the oblique jet hole 331, the rotator 33 will be forced by the running flow of high-pressure air to rotate with the inner race 340 of the bearing 34 in the opening 322 of the end cap 32, and therefore, the high-pressure air is continuously ejected out of the oblique jet hole 331 of the rotator 33 in a spiral pattern.
Referring to
In application, connect the air inlet 11 of the grip 1 to an external high-pressure air source (air compressor) with a high pressure hose 111, and then operate the trigger 13 of the grip 1 to control the intake of compressed air from the external high-pressure air source through the air inlet 11 and an air-delivery hole 121 of the valve seat 12 into the gas-delivery hole 20 of the attachment tube 2, enabling the intake flow of compressed air to go through the through hole 310 of the connection nut 31 of the gyrating nozzle head 3 into the plenum chamber 330 of the rotator 33 of the gyrating nozzle head 3 and then to go from the plenum chamber 330 through the oblique jet hole 331 toward the outside of the spray gun and to simultaneously force the rotator 33 to rotate with the inner race 340 of the bearing 34 relative to the end cap 32, and thus, a strong jet of air is continuously rotated and ejected out of the spray gun. When the intake flow of compressed air goes through the annular gap in the through hole 335 around the water outlet tip 2331, a Venturi effect is created in the through hole 335 of the rotator 33, causing the contained fluid to be sucked from the water tank 231 through the dip tube 232 and the bottom connection tube 23 into the water-supply tube 233 and then guided out of the water-supply tube 233 through the water outlet tip 2331 that is inserted into the through hole 335 of the rotator 33. When a flow of fluid is being ejected out of the water outlet tip 2331, compressed air is continuously guided into the plenum chamber 330 of the rotator 33 and ejected out of the oblique jet hole 331 and the annular gap in the through hole 335 around the water outlet tip 2331, causing the flow of fluid being ejected out of the water outlet tip 2331 to be turned into a mist.
Thus, when the user operates the trigger 13 of the grip 1 to let a flow of compressed air go from the external high-pressure air source through the air inlet 11 into the attachment tube 2 to the outside of the spray gun through the oblique jet hole 331 of the rotator 33 of the gyrating nozzle head 3 and the annular gap in the through hole 335 around the water outlet tip 2331, a flow of fluid is ejected out of the water outlet tip 2331 and turned into a mist. When a strong jet of compressed air is ejected out of the annular gap in the through hole 335 around the water outlet tip 2331 to turn the ejected flow of fluid into a mist, compressed air is simultaneously ejected out of the oblique jet hole 331, making the mist finer.
Further, the threading direction of the connection between the inner thread 321 of the end cap 32 and the outer thread 312 of the connection nut 31 is reversed to the direction of rotation of the rotator 33 in the accommodation open chamber 320 of the end cap 32. Therefore, in application, the end cap 32 will not be forced away from the connection nut 31, assuring a high level of spray gun operating safety and reducing the degree of danger in application.
As described above, the attachment tube 2 is connected to the grip 1 and the screw hole 311 of the connection nut 31 of the gyrating nozzle head 3 is threaded onto the tubular mating connection screw rod 22 of the attachment tube 2, and then the end cap 32 of the gyrating nozzle head 3 is threaded onto the connection nut 31 to hold the bearing 34 and the rotator 33 therein. In application, the air inlet 11 of the grip 1 is connected to an external high-pressure air source. When the trigger 13 is operated to open the valve seat 12, compressed air is guided through the air inlet 11 of the grip 1 and the gas-delivery hole 20 of the attachment tube 2 and the rotator 33 of the gyrating nozzle head 3, and then forced out of the oblique jet hole 331 of the rotator 33, and the centrifugal force thus produced causes the rotator 33 to rotate with the inner race 340 of the bearing 34. Further, the water tank 231 is connected to the bottom connection tube 23 of the attachment tube 2, and the dip tube 232 is connected to the bottom connection tube 23 and dipped in the water tank 231. Thus, when a swirling flow of compressed air is ejected out of the annular gap in the through hole 335 around the water outlet tip 2331, a flow of fluid is sucked into the dip tube 232 and guided through the water-supply tube 233 and the water outlet tip 2331 toward the outside of the rotator 33, and the fluid being ejected out of the water outlet tip 2331 is then turned into a mist, compressed air is simultaneously ejected out of the oblique jet hole 331, making the mist finer.
In conclusion, the invention provides an improved structure of gyrating nozzle spray gun, which comprises a grip that comprises a trigger-controlled valve seat, an attachment tube connected to the valve seat of the grip, and a gyrating nozzle head mounted on the attachment tube. The gyrating nozzle head comprises a connection nut threaded onto the attachment tube, an end cap threaded onto the connection nut, a bearing positioned in an accommodation open chamber of the end cap, and a rotator mounted in the accommodation open chamber of the end cap and rotatable with the inner race of the bearing relative to the end cap. When operating the trigger of the grip to open the valve seat, compressed air is guided from an external high-pressure air source through an air inlet of the grip into the attachment tube and the gyrating nozzle head and then forced out of an oblique jet hole in the rotator of the gyrating nozzle head, and thus, a swirling flow of compressed air is ejected out of the spray gun. Further, the attachment tube can be configured to provide a bottom connection tube for the connection of a water tank, and a water-supply tube can be mounted in the attachment tube and extended from the bottom connection tube to the rotator. Thus, when a swirling flow of compressed air is ejected out of the annular gap in the through hole around the water outlet tip, a flow of fluid is sucked into the bottom connection tube of the attachment tube and ejected out of the water outlet tip of the water-supply tube, and the fluid being ejected out of the water outlet tip is then turned into a mist, compressed air is simultaneously ejected out of the oblique jet hole, making the mist finer.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
