Gear pump with pressure relief protection function

Abstract

The utility model discloses a gear pump with pressure relief protection, which comprises a pump body comprising an upper pump body, a lower pump body and a middle body arranged between the upper pump body and the lower pump body; a containing cavity communicated with the upper pump body and the lower pump body is formed in the middle body. A first pressure relief channel and a second pressure relief channel which communicate with the containing cavity are formed in the upper pump body. An inflow channel and an outflow channel which are communicated with the containing cavity are formed in the lower pump body; the gear set comprises a driving gear and a driven gear which are meshed with each other, and is arranged in the accommodating cavity; the driving motor is in transmission connection with the driving gear through a coupler; and the one-way pressure relief assembly is arranged in the upper pump body, and when the pressure of the outflow channel exceeds a threshold value, the one-way pressure relief assembly is driven by the liquid pressure of the second pressure relief channel to be opened, so that the second pressure relief channel and the first pressure relief channel form a backflow channel, and the overpressure liquid is directionally released to the containing cavity. The technical problem that in the prior art, when the pressure of an oil inlet cavity exceeds a preset value, a shell is prone to burst is solved.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, and specifically to a gear pump with pressure relief protection. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump cylinder and the meshing gears. The working principle of a gear pump is as follows: during the rotation of the two gears, the volume of the space on the disengaged side of the gears increases from small to large, forming a vacuum, which draws in the liquid; the volume of the space on the meshing side of the gears decreases from large to small, thereby expelling the liquid from the gear pump.

[0003] The gear pump includes a housing, a set of meshing gears, and front and rear covers. After the gears are installed inside the housing, the front and rear sides of the housing are sealed by the front and rear covers, and the meshing gears divide the internal chamber of the housing into an oil inlet chamber and an oil outlet chamber. The oil inlet chamber has a vacuum effect to draw oil into the housing, and then the rotation of the gears carries the oil in the oil inlet chamber to the oil outlet chamber, and finally discharges the oil from the oil outlet chamber. However, when the pressure in the oil inlet chamber exceeds a preset value, the housing is prone to rupture, posing a safety hazard. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a gear pump with pressure relief protection, aiming to solve the technical problem that the housing is prone to bursting when the pressure in the oil inlet chamber exceeds a preset value.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A gear pump with pressure relief protection includes:

[0007] The pump body includes an upper pump body, a lower pump body, and an intermediate body disposed between the upper pump body and the lower pump body;

[0008] The intermediate body has a cavity inside that communicates with the upper pump body and the lower pump body;

[0009] The upper pump body is equipped with a pressure relief channel one and a pressure relief channel two that communicate with the cavity;

[0010] The lower pump body has an inflow channel and an outflow channel that communicate with the cavity;

[0011] The gear set, including a driving gear and a driven gear that mesh with each other, is located in the cavity;

[0012] The drive motor is connected to the drive gear transmission via a coupling;

[0013] The one-way pressure relief component is located inside the upper pump body. When the pressure in the outflow channel exceeds the threshold, the one-way pressure relief component is opened by the liquid pressure in the second pressure relief channel, so that the second pressure relief channel and the first pressure relief channel form a return flow path, realizing the directional release of overpressure liquid into the cavity.

[0014] Furthermore, the one-way pressure relief assembly includes:

[0015] The adjusting screw is threaded into the mounting hole of the upper pump body, and a spring seat is provided at its axial end.

[0016] The sealing ring is fitted onto the outer wall of the adjusting screw and forms a static seal with the inner wall of the upper pump body mounting hole.

[0017] The return spring is sleeved on the outside of the adjusting screw, with one end abutting against the spring seat and the other end abutting against the ball.

[0018] The ball bearings, under the preload of the return spring, seal and fit against the second outlet end face of the pressure relief channel;

[0019] When the liquid pressure in pressure relief channel two exceeds the threshold, the ball bearing is pressed away from the outlet end face, making pressure relief channel two connected to pressure relief channel one.

[0020] Furthermore, the ratio of the diameter of the ball to the outlet diameter of the second pressure relief channel is 1.2:1 to 1.5:1, and the surface of the ball is nitrided to form a wear-resistant layer with a hardness ≥60HRC.

[0021] Furthermore, the inlet cross-sectional area of ​​the second pressure relief channel is 1.2-1.5 times the outlet cross-sectional area of ​​the first pressure relief channel, and the axes of the two channels form an angle of 15°-30°.

[0022] Furthermore, the intermediate body is provided with a connecting post that penetrates through it, and the lower end face of the upper pump body and the upper end face of the lower pump body are provided with connecting holes corresponding to the positions of the connecting post.

[0023] Furthermore, it also includes at least three sets of locking screws evenly distributed circumferentially. Each set of locking screws passes through the mounting hole one of the upper pump body and the mounting hole two of the intermediate body in sequence, and is threaded into the mounting hole three of the lower pump body. A sealing ring is provided between the upper pump body, the intermediate body and the lower pump body.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] A gear pump with pressure relief protection is provided, including a pump body, gear set, drive motor, and one-way pressure relief assembly. The pump body comprises an upper pump body, a lower pump body, and an intermediate body between the upper and lower pump bodies. By designing the pump body with a three-section connection structure, the need for complete pump failure due to partial damage is reduced. When a component fails, only the affected part needs to be replaced, extending the overall service life of the pump body. The one-way pressure relief assembly opens under the liquid pressure of the second pressure relief channel when the pressure in the outflow channel exceeds a threshold. This creates a return flow path between the second and first pressure relief channels, allowing for the directional release of overpressured liquid into the cavity, reducing the risk of casing rupture and mitigating safety hazards. Attached Figure Description

[0026] Figure 1 The figure shown is a three-dimensional structural diagram of this utility model;

[0027] Figure 2 The diagram shown is a structural diagram of the pump body;

[0028] Figure 3 The diagram shows the disassembled assembly structure of the pump body;

[0029] Figure 4 The image shown is a perspective view of the upper pump body.

[0030] Figure 5 The diagram shown is of the upper pump body structure.

[0031] Figure 6 The diagram shows the assembly structure of the intermediate body and the lower pump body.

[0032] Figure 7 The diagram shown is of the intermediate structure.

[0033] Figure 8 The diagram shown is of the lower pump body structure.

[0034] Figure 9 The diagram shows the structure of a one-way pressure relief assembly.

[0035] In the diagram: 1. Pump body; 2. Gear set; 3. Drive motor; 4. One-way pressure relief assembly; 5. Locking screw; 11. Upper pump body; 12. Intermediate body; 13. Lower pump body; 21. Drive gear; 22. Driven gear; 41. Adjusting screw; 42. Sealing ring; 43. Return spring; 44. Ball bearing; 111. Pressure relief channel one; 112. Pressure relief channel two; 113. Connecting hole; 114. Mounting hole one; 121. Cavity; 122. Connecting post; 123. Mounting hole two; 131. Inflow channel; 132. Outflow channel; 133. Connecting hole; 134. Mounting hole three; 411. Spring seat. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] See Figure 1-9 As shown, this utility model provides a technical solution: a gear pump with pressure relief protection, comprising:

[0038] Pump body 1 includes an upper pump body 11, a lower pump body 13, and an intermediate body 12 disposed between the upper pump body 11 and the lower pump body 13;

[0039] The intermediate body 12 has a cavity 121 that communicates with the upper pump body 11 and the lower pump body 13;

[0040] The upper pump body 11 is provided with a pressure relief channel 111 and a pressure relief channel 112 that are connected to the cavity 121;

[0041] The lower pump body 13 is provided with an inflow channel 131 and an outflow channel 132 that communicate with the cavity 121;

[0042] Gear set 2, including a driving gear 21 and a driven gear 22 that mesh with each other, is disposed in cavity 121;

[0043] The drive motor 3 is connected to the drive gear 21 via a coupling.

[0044] The one-way pressure relief component 4 is located inside the upper pump body 11. When the pressure in the outflow channel 132 exceeds the threshold, the one-way pressure relief component 4 is opened by the liquid pressure in the second pressure relief channel 112, so that the second pressure relief channel 112 and the first pressure relief channel 111 form a return flow path, realizing the directional release of overpressure liquid to the cavity 121.

[0045] By designing the pump body with a three-section connection structure, the risk of the entire pump body being scrapped due to partial damage is reduced. When a component is damaged, only the damaged part needs to be replaced, thus extending the overall service life of the pump body. By incorporating a one-way pressure relief component 4, when the pressure in the outflow channel 132 exceeds a threshold, the one-way pressure relief component 4 is opened by the liquid pressure in the second pressure relief channel 112. This creates a return flow path between the second pressure relief channel 112 and the first pressure relief channel 111, enabling the directional release of overpressured liquid into the cavity 121. This reduces the possibility of shell rupture and helps mitigate safety hazards.

[0046] See Figure 4-5As shown, the inlet cross-sectional area of ​​pressure relief channel 2 112 is 1.2-1.5 times the outlet cross-sectional area of ​​pressure relief channel 1 111. The inlet cross-sectional area forms a gradually narrowing flow channel structure, and the axes of the two channels are at an angle of 15°-30°.

[0047] See Figure 5-8 As shown, the intermediate body 12 is provided with a connecting post 122 that penetrates through it, and the lower end face of the upper pump body 11 and the upper end face of the lower pump body 13 are provided with connecting holes (113, 133) corresponding to the position of the connecting post 122. Through the above design, a three-stage positioning structure (connecting post + double-end holes) is formed, and the assembly accuracy is improved.

[0048] See Figure 2 , 6 As shown in Figure -8, the system also includes at least three sets of locking screws 5 evenly distributed circumferentially. Each set of locking screws 5 passes sequentially through the mounting hole 114 of the upper pump body 11 and the mounting hole 123 of the intermediate body 12, and is threaded into the mounting hole 134 of the lower pump body 13. Sealing rings are provided on the end faces of the upper pump body 11, intermediate body 12, and lower pump body 13. Through this design, the connection between the upper pump body 11, intermediate body 12, and lower pump body 13 is secure and easy to assemble and disassemble. The sealing rings further enhance the sealing performance between the upper pump body 11, intermediate body 12, and lower pump body 13, reducing the risk of fluid leakage.

[0049] See Figure 9 As shown, the one-way pressure relief assembly 4 includes: an adjusting screw 41, threaded into the mounting hole of the upper pump body 11, with a spring seat 411 at its axial end; a sealing ring 42, fitted onto the outer wall of the adjusting screw 41, forming a static seal with the inner wall of the mounting hole of the upper pump body 11; a return spring 43, fitted onto the outside of the adjusting screw 41, with one end abutting against the spring seat 411 and the other end abutting against a ball bearing 44; the ball bearing 44, under the preload of the return spring 43, seals against the outlet end face of the second pressure relief channel 112; when the liquid pressure in the second pressure relief channel 112 exceeds the threshold, the ball bearing 44 is pressed away from the outlet end face, connecting the second pressure relief channel 112 with the first pressure relief channel 111. Replacing the traditional planar valve core with a ball seal utilizes spherical contact to achieve low-pressure sealing adaptability, while reducing the risk of particulate matter entrapment.

[0050] The ratio of the diameter of the ball bearing 44 to the outlet orifice diameter of the pressure relief channel 112 is 1.2:1 to 1.5:1, and the surface of the ball bearing 44 is nitrided to form a wear-resistant layer with a hardness ≥60HRC. The ratio of the ball bearing diameter to the outlet orifice diameter ensures a balance between sealing reliability and opening sensitivity.

[0051] Working principle: The drive motor 3 drives the drive gear 21 through the coupling. When the drive gear 21 meshes with the driven gear 22, the space between the gears increases, forming a partial vacuum. Under atmospheric pressure, the liquid is drawn into the pump (i.e., the liquid enters from the inflow channel 131). The drawn-in liquid is carried into the tooth groove as the gear rotates and moves along the inner wall of the pump body. When the gears re-mesh, the space decreases, the liquid is compressed and discharged from the outlet under high pressure (i.e., the liquid is discharged from the outflow channel 132). When the pressure in the outflow channel 132 exceeds the threshold, the one-way pressure relief component 4 is opened by the liquid pressure in the second pressure relief channel 112, so that the second pressure relief channel 112 and the first pressure relief channel 111 form a return flow path, realizing the directional release of overpressure liquid to the cavity 121, reducing the possibility of shell rupture and facilitating the reduction of safety hazards.

Claims

1. A gear pump with pressure relief protection, characterized in that, include: The pump body (1) includes an upper pump body (11), a lower pump body (13) and an intermediate body (12) disposed between the upper pump body (11) and the lower pump body (13). The intermediate body (12) has a cavity (121) that communicates with the upper pump body (11) and the lower pump body (13). The upper pump body (11) is provided with a pressure relief channel one (111) and a pressure relief channel two (112) that are connected to the cavity (121). The lower pump body (13) is provided with an inflow channel (131) and an outflow channel (132) that communicate with the cavity (121). The gear set (2) includes a driving gear (21) and a driven gear (22) that mesh with each other, and is disposed in the cavity (121); The drive motor (3) is connected to the drive gear (21) via a coupling; The one-way pressure relief component (4) is located inside the upper pump body (11). When the pressure in the outflow channel (132) exceeds the threshold, the one-way pressure relief component (4) is driven to open by the liquid pressure of the pressure relief channel two (112), so that the pressure relief channel two (112) and the pressure relief channel one (111) form a return flow path, thereby realizing the directional release of overpressure liquid to the cavity (121).

2. The gear pump with pressure relief protection of claim 1, wherein, The one-way pressure relief assembly (4) includes: Adjusting screw (41) is threaded into the mounting hole of the upper pump body (11), and its axial end is provided with spring seat (411). The sealing ring (42) is fitted on the outer wall of the adjusting screw (41) and forms a static seal with the inner wall of the mounting hole of the upper pump body (11); The return spring (43) is sleeved on the outside of the adjusting screw (41), with one end abutting against the spring seat (411) and the other end abutting against the ball (44). The ball (44) seals against the outlet end face of the pressure relief channel two (112) under the preload of the return spring (43); When the liquid pressure in the second pressure relief channel (112) exceeds the threshold, the ball (44) is pressed away from the outlet end face, so that the second pressure relief channel (112) is connected to the first pressure relief channel (111).

3. The gear pump with pressure relief protection of claim 2, wherein, The ratio of the diameter of the ball (44) to the outlet diameter of the pressure relief channel (112) is 1.2:1 to 1.5:1, and the surface of the ball (44) is nitrided to form a wear-resistant layer with a hardness ≥60HRC.

4. The gear pump with pressure relief protection of claim 1, wherein, The inlet cross-sectional area of ​​the second pressure relief channel (112) is 1.2-1.5 times the outlet cross-sectional area of ​​the first pressure relief channel (111), and the axes of the two channels form an angle of 15°-30°.

5. The gear pump with pressure relief protection of claim 1, wherein, The intermediate body (12) is provided with a docking post (122) that penetrates through it, and the lower end face of the upper pump body (11) and the upper end face of the lower pump body (13) are provided with docking holes (113, 133) corresponding to the position of the docking post (122).

6. The gear pump with pressure relief protection of claim 1, wherein, It also includes at least three sets of locking screws (5) evenly distributed in the circumference. Each set of locking screws (5) passes through the first mounting hole (114) of the upper pump body (11) and the second mounting hole (123) of the intermediate body (12) in sequence, and is threaded into the third mounting hole (134) of the lower pump body (13). A sealing ring is provided between the upper pump body (11), the intermediate body (12) and the lower pump body (13).

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