Patent Application
20210131453
High pressure hydraulic circuits may be used, for instance, with pneumatic devices or tools for various purposes. However, not only are these circuits fairly complicated including reservoirs, sensors, pumps, valves, fillers, drains, etc., which can make then liable to failures, they can also be expensive. In other instances, high pressure fluid sources for providing stored energy may not be readily available.
Aspects of the present disclosure provide a system comprising a hydraulic amplifier. The hydraulic amplifier includes a piston body including a movable piston having a base that divides an interior of the piston body into a first chamber and a second chamber. The piston also includes a shaft, the piston body including at least one fluid port for filling the first chamber with a first fluid. The first fluid is a compressible fluid. The hydraulic amplifier also includes a hydraulic body attached to the piston body, the hydraulic body including a third chamber having a second fluid therein. The second fluid is a second compressible fluid. The shaft is arranged at least partially in the third chamber, the hydraulic body further including a plurality of fluid ports including a first fluid port for attachment with a pressure sensor and a second fluid port for attachment with a tool. The shaft is configured to compress the second fluid by amplifying a pressure of the first fluid according to a ratio of a cross-sectional area of the first or second chamber to a cross-sectional area of the third chamber.
In one example, the system also includes the tool, and the compressed second fluid is configured to activate the tool by way of the second fluid port. In another example, the piston body further includes another fluid port configured to allow the compressed fluid to escape the first chamber in order to reset the movable piston. In another example, the at least one fluid port is arranged to enable gravity to assist the compressed first fluid in filling the first chamber, and the another fluid port is arranged to enable gravity to assist fluid in escaping the first chamber. In another example, the first fluid is compressed air. In addition, the second fluid is hydraulic oil. In another example, the hydraulic body further includes a third fluid port configured as a safety device for situations in which pressure of the second fluid surpasses a threshold. In another example, the hydraulic body further includes a third fluid port configured for adding the second fluid to the third chamber. In another example, the hydraulic body further includes a third fluid port configured for draining the second fluid from the third chamber for maintenance. In another example, the piston body is cylindrical, and the hydraulic body is cylindrical. In this example, the ratio corresponds to a square of a radius of the first chamber or the second chamber to the square of a radius of the third chamber. In another example, the amplification is at least 40 times.
Another aspect of the disclosure provides a hydraulic amplifier. The hydraulic amplifier consists essentially of a piston body and a hydraulic body. The piston body includes a movable piston having a base that divides an interior of the piston body into a first chamber and a second chamber. The piston also includes a shaft, the piston body including at least one fluid port for filling the first chamber with a first fluid, the first fluid being a compressible fluid. The hydraulic body is attached to the piston body. The hydraulic body including a third chamber having a second fluid therein, the second fluid being a second compressible fluid, the shaft being arranged at least partially in the third chamber. The hydraulic body also includes a plurality of fluid ports including a first fluid port for attachment with a pressure sensor and a second fluid port for attachment with a tool. The shaft is configured to compress the second fluid by amplifying a pressure of the first fluid according to a ratio of a cross-sectional area of the first or second chamber to a cross-sectional area of the third chamber.
In one example, the first fluid is compressed air. In addition, the second fluid is hydraulic oil. In another example, the piston body is cylindrical and the hydraulic body is cylindrical. In this example, the ratio corresponds to a square of a radius of the first chamber or the second chamber to the square of a radius of the third chamber. In another example, the amplification is at least 40 times.
A further aspect of the disclosure provides a method for using a hydraulic amplifier including a hydraulic body and a piston body including a first chamber and a second chamber. The method includes filling the first chamber of the piston body with a first fluid via a first fluid port of the piston body; causing a piston to move within the piston body from a rest position to an active position and thereby increasing a size of the first chamber and decreasing a size of a second chamber; compressing a second fluid within a third chamber of a hydraulic body; and using the compressed second fluid to activate a tool connected to a fluid port of the hydraulic body.
In one example, the method also includes, after activating the tool, causing the piston to return to the rest position.
The present disclosure generally relates to situations in which high pressure hydraulic circuits are required. As noted above, such circuits may typically be used, for instance, for pneumatic devices or tools for various purposes. However, not only are these circuits fairly complicated including reservoirs, sensors, pumps, valves, fillers, drains, etc., which can make then liable to failures, they can also be expensive. In other instances, high pressure fluid sources for providing stored energy may not be readily available. To address these shortcomings, a simplified, unibody, single-shot hydraulic amplifier may be used to replace an entire hydraulic circuit.
The hydraulic amplifier may include a cylindrical piston body and a cylindrical hydraulic body. Within the piston body is a movable piston. The piston divides the piston body into first and second chambers. The piston body may include a first fluid port in fluid communication with the first chamber. The first fluid port may be attached to a fluid source, such as a compressor that provides compressed air.
Filling the first chamber with fluid, such as the compressed air, via the first fluid port may cause the piston to be moved towards the hydraulic body connected to the piston body. This movement may increase the size of the first chamber and decrease the size of the second chamber. The air may also be able to escape from the first chamber via the first fluid port, or alternatively through a second port which may be a drain or vent port that can be opened in order to allow air to exit the first chamber and allow the movable piston to rest.
The movable piston also includes a shaft arranged at least partially in an opening corresponding to a third chamber in the hydraulic body. The third chamber may include a plurality of fluid ports for various purposes.
The configuration of the hydraulic amplifier enables a lower pressure fluid source to create a higher pressure compressed fluid. This highly compressed fluid may then be used to activate a tool connected to a fluid port of the hydraulic body.
The features described herein may provide a simplified hydraulic amplifier which can be used to replace many types of more complicated hydraulic circuits. The hydraulic amplifier may thus be useful in various applications including manufacturing, automation, etc. which require high pressure fluid sources for actuating tools for forming, holding, crimping, cutting, etc. In addition, the hydraulic amplifier may be especially useful in situations in which other high-pressure fluid sources are not readily available.
The piston 210 also includes a shaft 240 arranged at least partially in an opening 250 there by creating a third chamber 260 in the hydraulic body 120. The third chamber 260 may include a second fluid. This second fluid may be a non-compressible fluid, to more easily achieve higher pressures, such as hydraulic oil.
The piston body includes a first fluid port 230 in fluid communication with the first chamber 222. The first fluid port 230 may allow a first fluid to enter into the first chamber 222. This first fluid may be a compressible fluid, such as air. In this regard, the first fluid port 230 may be attached to a fluid source, such as an air compressor 610 that provides compressed air shown in
The hydraulic body 120 may also include a plurality of fluid ports in fluid communication with the third chamber 260 for various purposes.
A sixth fluid port 440 may be used to fill the third chamber with fluid, and thereafter, the sixth fluid port may be sealed, for instance, using a plug or other device or materials.
For example,
At block 520 of
At block 530 of
The configuration of the hydraulic amplifier may enable a lower pressure fluid source to create a higher pressure compressed fluid. For instance, pumping air into the first chamber 222 may cause the piston 210 to force the shaft 240 into the third chamber 260, and thereby compress the second fluid in the third chamber. The difference in diameter of the first or second chamber 222, 224 (as these chambers have the same diameters) relative to the diameter of the third chamber may actually cause an amplification in the pressure of the second fluid in the third chamber. This amplification may be defined as a ratio of the cross-sectional area of the third chamber to the cross-sectional area of the first or second chamber 222, 224.
The cross-sectional area of each of the first, second, and third chambers 222, 224, 260 may be defined by π*r2, where r represents a respective radius of each chamber. Because pressure is determined by force over area, the ratio may be simplified to the square of the radius of the first or second chamber 222, 224 over the square of the radius of the third chamber 260. For example, if the radius R3 of the third chamber 260 is 6.5 times smaller than the radius R1, R2 respectively, of the first or second chamber 222, 224, the amplification of the pressure of the first and second fluids or rather, between the second and third chambers may be 42.25 times (or 6.5 squared). In that regard, if compressed air at 100 PSI is introduced into the first chamber, this may result in the hydraulic oil being compressed to approximately 4225 PSI.
At block 540 of
Of course, as noted above, the hydraulic amplifier may be used to replace hydraulic circuits for any number of different types of applications. However, to ensure proper function of the hydraulic amplifier, the hydraulic amplifier should be mounted such that the path of the piston is generally perpendicular to the direction of gravity and such that gravity can be used to assist or enable the filling and draining of the first chamber.
After the tool is activated, the first fluid may also be able to escape from the first chamber via the first fluid port 230. In this regard, the first fluid port may enable fluid (e.g. air) exit from the first chamber 222 and allow the movable piston to reset or return to the rest position depicted in
The features described herein may provide a simplified hydraulic amplifier which can be used to replace many types of more complicated hydraulic circuits. The hydraulic amplifier may thus be useful in various applications including manufacturing, automation, etc. which require high pressure fluid sources for actuating tools for forming, holding, crimping, cutting, etc. In addition, the hydraulic amplifier may be especially useful in situations in which other high-pressure fluid sources are not readily available.
Most of the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. As these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the subject matter defined by the claims. As an example, the preceding operations do not have to be performed in the precise order described above. Rather, various steps can be handled in a different order or simultaneously. Steps can also be omitted unless otherwise stated. In addition, the provision of the examples described herein, as well as clauses phrased as “such as,” “including” and the like, should not be interpreted as limiting the subject matter of the claims to the specific examples; rather, the examples are intended to illustrate only one of many possible embodiments. Further, the same reference numbers in different drawings can identify the same or similar elements.
