Bidirectional operation gear pump with one-way valve

Abstract

The utility model discloses a bidirectional operation gear pump with a one-way valve, which comprises a pump body, one end of the pump body is provided with a pump cavity, a gear assembly is arranged in the pump cavity and is matched with the pump cavity, a pump cover is fixedly arranged on the pump body and is matched with the pump cavity in a sealing way, and the other end of the pump body is communicated with a pressure relief cavity in a sealing way. One end of the transmission shaft penetrates through the pressure relief cavity and the pump body and then is fixedly connected with the gear assembly, the gear assembly divides the pump cavity into a first hydraulic cavity and a second hydraulic cavity, the first hydraulic cavity and the second hydraulic cavity are both communicated with the pressure relief cavity in a sealed mode through pressure relief channels, and one-way valve assemblies are arranged in the two pressure relief channels in a sealed mode. The pump cover is provided with a first oil inlet and outlet channel and a second oil inlet and outlet channel, the first oil inlet and outlet channel communicates with the first hydraulic cavity, and the second oil inlet and outlet channel communicates with the second hydraulic cavity. Hydraulic oil in the pump cavity enters the pressure relief cavity after leaking, the hydraulic oil in the pressure relief cavity enters the pump cavity through the pressure relief channel and the one-way valve assembly, and therefore the hydraulic oil cannot leak.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a bidirectional operating gear pump with a one-way valve. Background Art

[0002] In the gear pump in the existing technology, the driving motor drives the active gear to rotate in the pump body through the transmission shaft. Since the rotation speed of the transmission shaft is very high, the pressure in the pump chamber in the pump body increases, and the sealing effect between the transmission shaft and the pump body will deteriorate, resulting in oil leakage. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a bidirectional gear pump with a one-way valve.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] The cam is secured to the pump with a secure connection to the pump housing, and the cam is secured to the pump housing by a secure connection to the pump housing.

[0006] Furthermore, a mounting cavity is provided on the bottom of the pump cavity, an end of the pressure relief channel is communicated with the bottom of the mounting cavity, and the one-way valve assembly is sealed and fixedly provided in the mounting cavity.

[0007] Furthermore, the one-way valve assembly includes a limit sleeve, a return spring and a blocking member. The limit sleeve is sealed and fixed in the installation cavity. The blocking member is sealingly arranged on one end of the limit sleeve and seals with the limit sleeve. One end of the return spring is arranged on the other end of the limit sleeve, and the other end of the return spring is pressed against the blocking member. The blocking member is arranged close to the pressure relief cavity side.

[0008] Furthermore, the one-way valve assembly also includes a locking terminal, the end of the reset spring is arranged in the locking terminal, the locking terminal and the limiting sleeve are threadedly matched, and a penetrating oil hole is provided on the locking terminal.

[0009] Furthermore, the gear assembly includes a driving gear, a driven gear and a crescent plate, the driven gear is rotatably arranged in the pump chamber and cooperates with the pump chamber, the driving gear is coaxially fixed on the transmission shaft, and the external teeth of the driving gear are engaged with the internal teeth of the driven gear, the crescent plate is arranged between the driving gear and the driven gear, and the first hydraulic chamber and the second hydraulic chamber are respectively arranged on the two end sides of the crescent plate.

[0010] Furthermore, a wear-resistant ring is fixedly provided on the inner wall of the pump chamber, and the driven gear is coaxially provided in the wear-resistant ring and cooperates with the wear-resistant ring.

[0011] Furthermore, a first pressure plate is provided between the gear assembly and the bottom of the pump chamber, and first oil holes cooperating with the pressure relief channel are provided on both sides of the first pressure plate.

[0012] Furthermore, a second pressure plate is provided between the gear assembly and the pump cover, and second oil holes cooperating with the first inlet and outlet oil channels and the second inlet and outlet oil channels are provided on both sides of the second pressure plate.

[0013] The beneficial effects of the utility model are:

[0014] 1) In this technology, the hydraulic oil in the pump chamber leaks into the pressure relief chamber, and the hydraulic oil in the pressure relief chamber enters the pump chamber through the pressure relief channel and the one-way valve assembly, which does not cause leakage of the hydraulic oil.

[0015] 2) In this technology, a locking terminal is provided for installing a reset spring. With the threaded fit between the locking terminal and the limit sleeve, the pressure of the reset spring on the sealing member can be adjusted, thereby achieving the function of adjusting the pressure of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the three-dimensional connection structure diagram of the gear pump;

[0017] Figure 2 This is the internal connection structure diagram of the gear pump;

[0018] Figure 3 for Figure 2 A of the enlarged connection structure diagram;

[0019] Figure 4 It is a three-dimensional structural diagram of the pump body;

[0020] Figure 5 A diagram showing the connection structure between the first pressing plate, the second pressing plate and the gear assembly;

[0021] Figure 6 It is a three-dimensional connection structure diagram of the gear assembly;

[0022] In the figure, 1-pump body, 2-pump cover, 3-drive shaft, 4-pressure relief chamber, 5-first hydraulic chamber, 6-second hydraulic chamber, 7-pressure relief channel, 8-first oil inlet and outlet channels, 9-second oil inlet and outlet channels, 10-installation chamber, 11-limit sleeve, 12-reset spring, 13-sealing sleeve, 14-locking terminal, 15-oil hole, 16-driving gear, 17-driven gear, 18-crescent plate, 19-wear-resistant ring, 20-first pressure plate, 21-first oil hole, 22-second pressure plate, 23-second oil hole. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0024] See Figures 1-6 , the utility model provides a technical solution:

[0025] A bidirectional gear pump with a one-way valve comprises a pump body 1, a pump cover 2, a transmission shaft 3, a one-way valve assembly and a gear assembly. A pump chamber is provided on one end of the pump body 1, the gear assembly is provided in the pump chamber and cooperates with the pump chamber, the pump cover 2 is fixedly provided on the pump body 1 and seals with the pump chamber, the other end of the pump body 1 is sealed and connected to the pressure relief chamber 4, one end of the transmission shaft 3 passes through the pressure relief chamber 4 and the pump body 1 and is fixedly connected to the gear assembly, the gear assembly divides the pump chamber into a first hydraulic chamber 5 and a second hydraulic chamber 6, the first hydraulic chamber 5 and the second hydraulic chamber 6 are both sealed and connected to the pressure relief chamber 4 through a pressure relief channel 7, and both pressure relief channels 7 are sealed with a one-way valve assembly that prohibits flow to the pressure relief chamber 4, a first inlet and outlet oil channel 8 and a second inlet and outlet oil channel 9 are provided on the pump cover 2, the first inlet and outlet oil channel 8 is connected to the first hydraulic chamber 5, and the second inlet and outlet oil channel 9 is connected to the second hydraulic chamber 6. Among them, the pump body 1 is arranged on the pump seat, the pressure relief chamber 4 is arranged between the pump body 1 and the pump seat, and the drive shaft 3 and the pump seat are fully sealed. The hydraulic oil in the pressure relief chamber 4 will not flow out through the pump seat, and no sealing ring is set between the pump body 1 and the drive shaft 3. The hydraulic oil enters the first hydraulic chamber 5 through the first inlet and outlet oil channels 8, and the drive shaft 3 is driven to rotate forward by the forward rotation of the motor. The drive shaft 3 presses the hydraulic oil in the first hydraulic chamber 5 into the second hydraulic chamber 6 through the gear assembly. After the second hydraulic chamber 6 becomes a high-pressure chamber, it is discharged through the second inlet and outlet oil channels 9. A small part of the hydraulic oil in the second hydraulic chamber 6 leaks into the pressure relief chamber 4. When the pressure in the pressure relief chamber 4 can open the one-way valve assembly, the hydraulic oil in the pressure relief chamber 4 will enter the first hydraulic chamber 5; the hydraulic oil enters the second hydraulic chamber 6 through the second inlet and outlet oil channels 9, and the drive shaft 3 is driven to rotate reversely by the reverse rotation of the motor. The drive shaft 3 presses the hydraulic oil in the second hydraulic chamber 6 into the first hydraulic chamber 5 through the gear assembly. After the first hydraulic chamber 5 becomes a high-pressure chamber, it is discharged through the first inlet and outlet oil channels 8. A small part of the hydraulic oil in the first hydraulic chamber 5 leaks into the pressure relief chamber 4. When the pressure in the pressure relief chamber 4 can open the one-way valve assembly, the hydraulic oil in the pressure relief chamber 4 will enter the second hydraulic chamber 6.

[0026] In some embodiments, a mounting cavity 10 is provided at the bottom of the pump chamber. The end of the pressure relief passage 7 communicates with the bottom of the mounting cavity 10, and a one-way valve assembly is sealed and fixedly disposed within the mounting cavity 10. The mounting cavity 10 is used to mount a stop sleeve 11, which seals against the inner wall of the mounting cavity 10. Two mounting cavities 10 are provided, one for each of the first hydraulic chamber 5 and the second hydraulic chamber 6.

[0027] In some embodiments, the one-way valve assembly includes a stopper sleeve 11, a return spring 12, and a plugging member 13. The stopper sleeve 11 is sealed and fixed within the mounting cavity 10. The plugging member 13 is sealed and fitted to one end of the stopper sleeve 11. One end of the return spring 12 is mounted on the other end of the stopper sleeve 11, and the other end of the return spring 12 presses against the plugging member 13. The plugging member 13 is positioned adjacent to the pressure relief chamber 4. The stopper sleeve 11 is used to mount the return spring 12 and the plugging member 13, which together form a one-way flow structure.

[0028] In some embodiments, the one-way valve assembly further includes a locking terminal 14, within which the end of the return spring 12 is disposed. The locking terminal 14 is threadedly engaged with the stop sleeve 11, and an oil hole 15 is provided through the locking terminal 14. The locking terminal 14 is used to mount the return spring 12. The threaded engagement between the locking terminal 14 and the stop sleeve 11 allows the pressure exerted by the return spring 12 on the sealing member 13 to be adjusted.

[0029] In some embodiments, the gear assembly includes a driving gear 16, a driven gear 17, and a crescent plate 18. The driven gear 17 is rotatably mounted within and engaged with the pump chamber. The driving gear 16 is coaxially fixed to the transmission shaft 3, with the external teeth of the driving gear 16 meshing with the internal teeth of the driven gear 17. The crescent plate 18 is positioned between the driving gear 16 and the driven gear 17. The first hydraulic chamber 5 and the second hydraulic chamber 6 are respectively positioned on opposite ends of the crescent plate 18. In the prior art, a motor drives the transmission shaft 3 to rotate, which in turn drives the driving gear 16, which in turn drives the driven gear 17. Under the action of the crescent plate 18, a high-pressure chamber and a low-pressure chamber are formed on either side of the crescent plate 18, respectively. The low-pressure chamber serves as the input chamber, and the high-pressure chamber serves as the output chamber. The driving gear 16, the driven gear 17, and the crescent plate 18 are all of equal height, and their ends contact the first and second pressure plates 20 and 22, respectively. The crescent plate 18 is connected to the pump cover 2 through a fixing pin. When the driving gear 16 and the driven gear 17 rotate, the crescent plate 18 does not rotate with the driving gear 16.

[0030] In some embodiments, a wear-resistant ring 19 is fixedly mounted on the inner wall of the pump chamber, and the driven gear 17 is coaxially disposed within and cooperates with the wear-resistant ring 19. The driving gear 16 drives the driven gear 17 to rotate within the wear-resistant ring 19. The wear-resistant ring 19 can be easily replaced after wear, preventing the driven gear 17 from directly wearing the pump body 1.

[0031] In some embodiments, a first pressure plate 20 is provided between the gear assembly and the bottom of the pump chamber, and first oil holes 21 cooperating with the pressure relief channel 7 are provided on both sides of the first pressure plate 20. A second pressure plate 22 is provided between the gear assembly and the pump cover 2, and second oil holes 23 cooperating with the first inlet and outlet oil channels 8 and the second inlet and outlet oil channels 9 are provided on both sides of the second pressure plate. The function of the first pressure plate 20 and the second pressure plate 22 is to confine the driven gear 16, the driven gear 17 and the crescent plate 18 between the first pressure plate 20 and the second pressure plate 22. The first oil hole 21 facilitates the flow of hydraulic oil in the two pressure relief channels 7, and the second oil hole 23 facilitates the flow / discharge of hydraulic oil from the first inlet and outlet oil channels 8 or the second inlet and outlet oil channels 9 into the pump chamber. The first pressure plate 20 and the second pressure plate 22 do not rotate in the pump chamber.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "one end", "top", "middle", "the other end", "coaxial", "one side", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the present invention, unless otherwise clearly stipulated and limited, the terms "setting", "installation", "connection", "fixation", "hinge" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0034] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A bidirectional gear pump with a one-way valve, characterized in that: The invention comprises a pump body (1), a pump cover (2), a transmission shaft (3), a one-way valve assembly and a gear assembly, wherein a pump cavity is provided on one end of the pump body (1), the gear assembly is provided in the pump cavity and cooperates with the pump cavity, the pump cover (2) is fixedly provided on the pump body (1) and seals with the pump cavity, the other end of the pump body (1) is sealed and communicated with the pressure relief cavity (4), one end of the transmission shaft (3) passes through the pressure relief cavity (4) and the pump body (1) and is fixedly connected to the gear assembly, and the gear assembly divides the pump cavity into a first liquid and a second liquid. A pressure chamber (5) and a second hydraulic chamber (6), the first hydraulic chamber (5) and the second hydraulic chamber (6) are both sealed and communicated with the pressure relief chamber (4) through a pressure relief channel (7), and the two pressure relief channels (7) are both sealed with the one-way valve assembly for prohibiting flow into the pressure relief chamber (4), and the pump cover (2) is provided with a first inlet and outlet oil channel (8) and a second inlet and outlet oil channel (9), the first inlet and outlet oil channel (8) is communicated with the first hydraulic chamber (5), and the second inlet and outlet oil channel (9) is communicated with the second hydraulic chamber (6).

2. A bidirectional gear pump with a one-way valve according to claim 1, characterized in that: An installation cavity (10) is provided on the bottom of the pump cavity, an end of the pressure relief channel (7) is communicated with the bottom of the installation cavity (10), and the one-way valve assembly is sealed and fixedly provided in the installation cavity (10).

3. A bidirectional gear pump with a one-way valve according to claim 2, characterized in that: The one-way valve assembly includes a limit sleeve (11), a return spring (12) and a blocking member (13); the limit sleeve (11) is sealed and fixedly arranged in the installation cavity (10); the blocking member (13) is sealed and arranged on one end of the limit sleeve (11) and is sealed and matched with the limit sleeve (11); one end of the return spring (12) is arranged on the other end of the limit sleeve (11); the other end of the return spring (12) is pressed against the blocking member (13); and the blocking member (13) is arranged close to the pressure relief cavity (4).

4. A bidirectional gear pump with a one-way valve according to claim 3, characterized in that: The one-way valve assembly further comprises a locking terminal (14), the end of the return spring (12) is arranged in the locking terminal (14), the locking terminal (14) and the limiting sleeve (11) are threadedly engaged, and a penetrating oil hole (15) is provided on the locking terminal (14).

5. A bidirectional gear pump with a one-way valve according to any one of claims 1 to 4, characterized in that: The gear assembly comprises a driving gear (16), a driven gear (17) and a crescent plate (18); the driven gear (17) is rotatably arranged in the pump chamber and cooperates with the pump chamber; the driving gear (16) is coaxially fixedly arranged on the transmission shaft (3), and the external teeth of the driving gear (16) are meshed with the internal teeth of the driven gear (17); the crescent plate (18) is arranged between the driving gear (16) and the driven gear (17); the first hydraulic chamber (5) and the second hydraulic chamber (6) are respectively arranged on both end sides of the crescent plate (18).

6. A bidirectional gear pump with a one-way valve according to claim 5, characterized in that: A wear-resistant ring (19) is fixedly arranged on the inner wall of the pump chamber, and the driven gear (17) is coaxially arranged in the wear-resistant ring (19) and matched with the wear-resistant ring (19).

7. A bidirectional gear pump with a one-way valve according to any one of claims 1 to 4, characterized in that: A first pressure plate (20) is provided between the gear assembly and the bottom of the pump chamber, and first oil holes (21) cooperating with the pressure relief channel (7) are provided on both sides of the first pressure plate (20).

8. A bidirectional gear pump with a one-way valve according to any one of claims 1 to 4, characterized in that: A second pressure plate (22) is provided between the gear assembly and the pump cover (2), and second oil holes (23) are provided on both sides of the second pressure plate (2) for respectively cooperating with the first inlet and outlet oil passages (8) and the second inlet and outlet oil passages (9).

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