Self-protection gear pump based on modified gear

Abstract

The utility model discloses a self-protection gear pump based on a modified gear, which comprises a pump body, a driving modified gear and a driven modified gear are arranged in the pump body, the driving modified gear and the driven modified gear are meshed and connected, a sealing sheet for sealing the interior of the gear pump is arranged in the pump body, and the sealing sheet is arranged in the pump body. A communicating pipe is installed at the top end in the pump body, the two ends of the communicating pipe penetrate through the sealing piece to communicate with the interiors of the inlet end and the outlet end of the pump body, when the pressure difference between the inlet end and the outlet end of the pump body does not exceed a set threshold value, the second air groove does not coincide with the first air groove, and when the pressure difference between the inlet end and the outlet end of the pump body exceeds the set threshold value, the second air groove does not coincide with the second air groove. The second air groove and the first air groove coincide, at the moment of coincidence, pressure between the inlet end and the outlet end of the pump body is communicated, high pressure of the outlet end of the pump body is neutralized with low pressure of the inlet end of the pump body, the pressure difference between the inlet end and the outlet end of the pump body is reduced, and self-protection of the pump body is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a self-protection gear pump based on a displacement gear. Background Art

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. Some gear pumps use a displacement gear design, which makes the pump body compact and small in appearance while ensuring the smooth rotation of the gear pair.

[0003] When the displacement gear pump is working, low pressure appears at the inlet end and high pressure appears at the outlet end. When the pressure difference between the inlet and outlet ends exceeds the set threshold, it will cause wear between the displacement gears, thereby affecting the working efficiency of the gear pump. Utility Model Content

[0004] The purpose of the utility model is to provide a self-protection gear pump based on a displacement gear to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-protection gear pump based on displacement gears, comprising a pump body, an active displacement gear and a driven displacement gear are installed inside the pump body, the active displacement gear and the driven displacement gear are meshed and connected, a sealing sheet for sealing the inside of the gear pump is installed inside the pump body, a connecting pipe is installed at the top of the inner part of the pump body, both ends of the connecting pipe are connected to the inlet and outlet ends of the pump body through the sealing sheet, a connecting hole for adjusting the pressure at the inlet and outlet ends of the pump body is opened inside the connecting pipe, the pressure at the inlet and outlet ends of the pump body can be exchanged, a piston is slidably installed inside the connecting hole, pressure-regulating springs are symmetrically fixedly installed at both ends of the piston, one end of the pressure-regulating spring away from the piston is fixedly connected to the inner wall of the corresponding connecting hole of the connecting pipe, a first air groove is opened at one end of the piston close to the outlet end of the pump body, a second air groove is opened on the inner wall of one end of the connecting pipe close to the inlet end of the pump body, and the second air groove is in the same plane as the first air groove.

[0006] As a further preferred embodiment of the present technical solution, sealing rings are installed at the connection points between the two ends of the communicating hole and the sealing sheet.

[0007] As a further preferred embodiment of the present technical solution, installation grooves are symmetrically provided at the inner top of the pump body, and the connecting pipe is installed inside the two installation grooves.

[0008] As a further preferred embodiment of the present technical solution, a chamfer is provided on the top of the mounting groove.

[0009] As a further preferred embodiment of the present technical solution, the pump body is symmetrically provided with sliding grooves on both sides of the corresponding installation grooves, an insert block is slidably installed inside the sliding grooves, a limit rod is fixedly installed at the middle position of the pump body corresponding to the sliding groove, a limit hole is provided in the middle of the insert block corresponding to the position of the limit rod, the limit hole is slidably connected to the limit rod, a return spring is sleeved on the outer side of the limit rod, one end of the return spring is fixedly connected to the insert block, and the other end of the return spring is fixedly connected to the pump body, an inclined surface is provided at one end of the insert block away from the return spring, and holes are symmetrically provided at both ends of the connecting pipe.

[0010] As a further preferred embodiment of the present technical solution, a pulling block is fixedly mounted on one end of the insert block close to the return spring.

[0011] The utility model provides a self-protection gear pump based on variable displacement gears, which has the following beneficial effects:

[0012] (1) When the utility model is used, when the pressure difference between the inlet and outlet ends of the pump body does not exceed the set threshold value, the second air groove and the first air groove do not overlap. When the pressure difference between the inlet and outlet ends of the pump body exceeds the set threshold value, the second air groove and the first air groove overlap. At the moment of overlap, the pressure between the inlet and outlet ends of the pump body will be connected, and the high pressure at the outlet end of the pump body will be neutralized with the low pressure at the inlet end of the pump body, so as to reduce the pressure difference between the inlet and outlet ends of the pump body and realize self-protection of the pump body.

[0013] (2) The utility model installs the connecting pipe inside the installation groove, and the connecting pipe will squeeze the inclined surface of the plug block, driving the plug block to slide inside the slide groove. At this time, the return spring is in a compressed state. After the connecting pipe is completely installed inside the installation groove, the return spring squeezes the plug block to drive the plug block to slide into the socket, which is used to fix the position of the connecting pipe. When the connecting pipe is disassembled, the pull block is pushed to drive the plug block to slide inside the slide groove, and the plug block is slid out of the socket. The connecting pipe can be taken out from the inside of the installation groove, which is convenient for the installation and disassembly of the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall explosion structure of the utility model;

[0016] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0017] Figure 4 It is a schematic diagram of the partial explosion structure of the utility model;

[0018] In the figure: 1. pump body; 2. active shifting gear; 3. driven shifting gear; 4. sealing plate; 5. connecting pipe; 6. connecting hole; 7. piston; 8. pressure regulating spring; 9. first air groove; 10. second air groove; 11. sealing ring; 12. mounting groove; 13. chamfer; 14. slide groove; 15. plug-in block; 16. limiting rod; 17. limiting hole; 18. reset spring; 19. inclined surface; 20. plug-in hole; 21. pull block. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] The utility model provides a technical solution: Figures 1 to 4 As shown, in this embodiment, a self-protection gear pump based on a displacement gear comprises a pump body 1, wherein an active displacement gear 2 and a driven displacement gear 3 are installed inside the pump body 1, and the active displacement gear 2 and the driven displacement gear 3 are meshed and connected, and a sealing sheet 4 for sealing the inside of the gear pump is installed inside the pump body 1, and a connecting pipe 5 is installed at the top of the inner part of the pump body 1, and the two ends of the connecting pipe 5 pass through the sealing sheet 4 and are connected to the inlet and outlet ends of the pump body 1, and a connecting hole 6 for adjusting the pressure at the inlet and outlet ends of the pump body 1 is opened inside the connecting pipe 5, and the pressure at the inlet and outlet ends of the pump body 1 can be exchanged, and a piston 7 is slidably installed inside the connecting hole 6, and pressure regulating springs 8 are symmetrically fixedly installed at both ends of the piston 7, and the two pressure regulating springs 8 are compressed and stretched to balance To balance the pressure difference between the inlet and outlet ends of the pump body 1, the end of the pressure regulating spring 8 away from the piston 7 is fixedly connected to the inner wall of the corresponding connecting hole 6 of the connecting pipe 5, the piston 7 is provided with a first air groove 9 at the end close to the outlet end of the pump body 1, and the inner wall of the end of the connecting pipe 5 close to the inlet end of the pump body 1 is provided with a second air groove 10, the second air groove 10 and the first air groove 9 are in the same plane, when the pressure difference between the inlet and outlet ends of the pump body 1 does not exceed the set threshold value, the second air groove 10 does not overlap with the first air groove 9, when the pressure difference between the inlet and outlet ends of the pump body 1 exceeds the set threshold value, the second air groove 10 overlaps with the first air groove 9, at the moment of overlap, the pressure between the inlet and outlet ends of the pump body 1 will be connected, the high pressure at the outlet end of the pump body 1 will be neutralized with the low pressure at the inlet end of the pump body 1, so as to reduce the pressure difference between the inlet and outlet ends of the pump body 1.

[0021] like Figures 1 to 4 As shown, sealing rings 11 are installed at the connection points between the two ends of the communicating hole 6 and the sealing sheet 4 .

[0022] It is used to seal between the sealing sheet 4 and the connecting pipe 5, thereby ensuring the sealing inside the pump body 1.

[0023] like Figures 1 to 4As shown, the top inner portion of the pump body 1 is symmetrically provided with mounting grooves 12 , and the connecting pipe 5 is installed inside the two mounting grooves 12 .

[0024] Used for positioning the connecting pipe 5.

[0025] like Figures 1 to 4 As shown, a chamfer 13 is formed on the top of the mounting groove 12 .

[0026] It is convenient to slide the connecting pipe 5 into the installation groove 12.

[0027] like Figures 1 to 4 As shown, the pump body 1 is symmetrically provided with slide grooves 14 at both sides corresponding to the installation groove 12, and an insert block 15 is slidably installed inside the slide groove 14. A limit rod 16 is fixedly installed at the middle position of the pump body 1 corresponding to the slide groove 14, and a limit hole 17 is provided in the middle of the insert block 15 corresponding to the position of the limit rod 16. The limit hole 17 is slidably connected to the limit rod 16, and a return spring 18 is sleeved on the outer side of the limit rod 16, one end of the return spring 18 is fixedly connected to the insert block 15, and the other end of the return spring 18 is fixedly connected to the pump body 1, and an inclined surface 19 is provided at one end of the insert block 15 away from the return spring 18, and holes 20 are symmetrically provided at both ends of the connecting pipe 5.

[0028] When the connecting tube 5 is installed inside the mounting groove 12, the connecting tube 5 will squeeze the inclined surface 19 of the plug block 15, driving the plug block 15 to slide inside the slide groove 14. At this time, the reset spring 18 is in a compressed state. After the connecting tube 5 is completely installed inside the mounting groove 12, the reset spring 18 squeezes the plug block 15 to drive the plug block 15 to slide into the socket 20, which is used to fix the position of the connecting tube 5 and ensure the stable installation of the connecting tube 5.

[0029] like Figures 1 to 4 As shown, a pull block 21 is fixedly mounted on one end of the insert block 15 close to the return spring 18 .

[0030] By pushing the pull block 21 , the insert block 15 is driven to slide inside the slide groove 14 , and the insert block 15 is slid out of the insertion hole 20 , so that the connecting pipe 5 can be easily taken out from the inside of the installation groove 12 .

[0031] The utility model provides a self-protection gear pump based on variable displacement gears, and the specific working principle is as follows:

[0032] When the device is in use, low pressure appears at the inlet end of the pump body 1, and high pressure appears at the outlet end of the pump body 1. Under the action of the pressure difference between the inlet and outlet ends of the pump body 1, the piston 7 will move inside the connecting hole 6, and the pressure difference will act on the two pressure regulating springs 8. The two pressure regulating springs 8 will be compressed and stretched. When the pressure difference between the inlet and outlet ends of the pump body 1 does not exceed the set threshold, the second air groove 10 does not overlap with the first air groove 9. When the pressure difference between the inlet and outlet ends of the pump body 1 exceeds the set threshold, the second air groove 10 overlaps with the first air groove 9. At the moment of overlap, the pressure between the inlet and outlet ends of the pump body 1 will be connected, and the high pressure at the outlet end of the pump body 1 will be neutralized with the low pressure at the inlet end of the pump body 1, so as to reduce the pressure difference between the inlet and outlet ends of the pump body 1 and realize the self-protection of the pump body 1.

[0033] When installing the connecting pipe 5, the connecting pipe 5 will be installed inside the installation groove 12, and the connecting pipe 5 will squeeze the inclined surface 19 of the plug block 15, driving the plug block 15 to slide inside the slide groove 14. At this time, the reset spring 18 is in a compressed state. After the connecting pipe 5 is completely installed inside the installation groove 12, the reset spring 18 squeezes the plug block 15 to drive the plug block 15 to slide into the socket 20, which is used to fix the position of the connecting pipe 5. When disassembling the connecting pipe 5, push the pull block 21 to drive the plug block 15 to slide inside the slide groove 14, slide the plug block 15 out of the socket 20, and the connecting pipe 5 can be taken out from the inside of the installation groove 12.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-protecting gear pump based on a displacement gear, comprising a pump body (1), wherein an active displacement gear (2) and a driven displacement gear (3) are installed inside the pump body (1), wherein the active displacement gear (2) and the driven displacement gear (3) are meshedly connected, and a sealing sheet (4) for sealing the inside of the gear pump is installed inside the pump body (1), characterized in that: A connecting pipe (5) is installed at the top of the inner part of the pump body (1). The two ends of the connecting pipe (5) pass through the sealing sheet (4) and are connected to the inlet and outlet ends of the pump body (1). A connecting hole (6) is provided inside the connecting pipe (5) for adjusting the pressure at the inlet and outlet ends of the pump body (1). The pressure at the inlet and outlet ends of the pump body (1) can be exchanged. A piston (7) is slidably installed inside the connecting hole (6). Pressure regulating springs (8) are symmetrically fixedly installed at both ends of the piston (7). The end of the pressure regulating spring (8) away from the piston (7) is fixedly connected to the inner wall of the corresponding connecting hole (6) of the connecting pipe (5). A first air groove (9) is provided at one end of the piston (7) close to the outlet end of the pump body (1). A second air groove (10) is provided on the inner wall of one end of the connecting pipe (5) close to the inlet end of the pump body (1). The second air groove (10) and the first air groove (9) are in the same plane.

2. A self-protection gear pump based on displacement gear according to claim 1, characterized in that: Sealing rings (11) are installed at the connection points between the two ends of the communicating hole (6) and the sealing sheet (4).

3. A self-protection gear pump based on displacement gear according to claim 1, characterized in that: The top end of the pump body (1) is symmetrically provided with mounting grooves (12), and the connecting pipe (5) is installed inside the two mounting grooves (12).

4. A self-protection gear pump based on displacement gear according to claim 3, characterized in that: The top of the installation groove (12) is provided with a chamfer (13).

5. A self-protection gear pump based on displacement gear according to claim 4, characterized in that: The pump body (1) is symmetrically provided with slide grooves (14) at positions on both sides corresponding to the mounting groove (12), and an insert block (15) is slidably installed inside the slide groove (14). A limit rod (16) is fixedly installed at a middle position of the pump body (1) corresponding to the slide groove (14), and a limit hole (17) is provided in the middle of the insert block (15) corresponding to the position of the limit rod (16). The limit hole (17) is slidably connected to the limit rod (16), and a return spring (18) is sleeved on the outer side of the limit rod (16), one end of the return spring (18) is fixedly connected to the insert block (15), and the other end of the return spring (18) is fixedly connected to the pump body (1), and an inclined surface (19) is provided at one end of the insert block (15) away from the return spring (18), and plug holes (20) are symmetrically provided at both ends of the connecting pipe (5).

6. A self-protection gear pump based on displacement gear according to claim 5, characterized in that: A pull block (21) is fixedly mounted on one end of the insert block (15) close to the return spring (18).

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