Efficient noise reduction oil scavenger pump

Abstract

According to the efficient noise reduction oil scavenger pump, an oil passing hole with a certain-inclination inclined plane structure is formed in a piston sealing cover, so that brake fluid can be released more intensively, air in a pipeline can be emptied easily, and working noise is reduced; compared with the prior art, the lip-shaped sealing part on the plunger head has the advantages that the area of the lip opening part is increased, so that the sealing performance is better along with the increase of the oil pressure of a pump cavity, in the design, the plunger head is made of the PEEK material, the brake fluid resistance and the wear resistance are good, and the service life of the pump can be obviously prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil return pump technical field, concretely relates to a kind of high-efficiency noise reduction oil return pumps. BACKGROUND

[0002] In prior art, oil return pump is noisy when working, affect the comfort of use environment, in order to reduce noise, some oil return pumps have adopted complex noise reduction structure, but these structures often increase manufacturing cost and maintenance difficulty.In addition, the deficiency of sealing performance also leads to the service life of pump shortening, increase the use cost of user. SUMMARY

[0003] Therefore, the utility model provides a kind of high-efficiency noise reduction oil return pump.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of high-efficiency noise reduction oil return pump, including pump body, the pump body is composed of piston cover, liquid outlet steel ball seat and piston rod, the piston cover is arranged at the side of liquid outlet steel ball seat, oil passing hole is arranged on the piston cover, the hole wall of oil passing hole has inclined surface structure, the movable cavity is formed in the liquid outlet steel ball seat, plunger head is arranged in the movable cavity.

[0006] Preferably, the plunger head has body part, lip seal part, spring connecting part and piston contact part, the lip seal part is sealed with the inner wall of movable cavity, the steel ball groove is formed in the body part, the steel ball groove is provided with steel ball and liquid inlet spring, the two ends of the liquid inlet spring are respectively against steel ball and the inner wall of steel ball groove, one end of the steel ball extends out of the steel ball groove, one end of the piston rod extends into the movable cavity and is against the steel ball.

[0007] Preferably, the groove wall of the side of the steel ball groove away from steel ball is protruded to form guide end, the liquid inlet spring is sleeved on the guide end, the spring connecting part is protruded to form at the end of the body part close to the piston cover, the return spring is sleeved on the spring connecting part, the two ends of the return spring are respectively against the inner wall of movable cavity and the body part of liquid outlet steel ball seat, the gap of 2mm is formed between the return spring and the inner wall of movable cavity.

[0008] Preferably, the piston cover has cover connecting end, the end of the liquid outlet steel ball seat close to the piston cover is provided with connecting groove, the liquid outlet steel ball is arranged in the connecting groove, the connecting groove is communicated with movable cavity, the cover connecting end extends into the connecting groove and is in interference fit with the liquid outlet steel ball seat, the liquid inlet spring groove is set up on the cover connecting end, the liquid inlet spring is arranged in the liquid inlet spring groove, the two ends of the liquid inlet spring are respectively against the liquid outlet steel ball and the groove wall of liquid inlet spring groove.

[0009] Preferably, the liquid outlet steel ball seat is sleeved with filter screen on the side away from the piston cover.

[0010] Preferably, a rod oil hole is provided on the piston rod, and the diameter of the rod oil hole is 3.2 mm.

[0011] Preferably, the wire diameter of the liquid inlet spring is 0.9 mm.

[0012] Preferably, the outer diameter of the plunger head body is 9.5 mm.

[0013] The beneficial effects of the present invention are: by opening an oil-through hole with a certain slope inclined surface structure on the piston cover, the brake fluid can be released more concentratedly, which is conducive to emptying the air in the pipeline and reducing working noise; compared with the prior art, the lip sealing part on the plunger head has an increased lip part area, so that the sealing performance becomes better as the oil pressure in the pump chamber increases, and in this design, the plunger head is made of PEEK material, which has excellent brake fluid resistance and wear resistance, and can significantly improve the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Attachment Figure 1 This is a schematic structural diagram of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] The utility model provides the following technical solutions:

[0019] As attached Figure 1As shown, the utility model discloses a high-efficiency noise-reducing oil return pump, including a pump body, which is composed of a piston cover 1, a liquid outlet steel ball seat 3 and a piston rod 4. The piston cover 1 is arranged on one side of the liquid outlet steel ball seat 3. An oil hole 5 is arranged on the piston cover 1. The hole wall of the oil hole 5 has a slope structure 6. An active cavity 7 is formed in the liquid outlet steel ball seat 3. A plunger head 8 is arranged in the active cavity 7. The plunger head 8 has a body part 9, a lip sealing part 10, a spring connecting part 11 and a piston contact part 12. The lip sealing part 10 is sealed with the inner wall of the active cavity 7. A steel ball groove 13 is formed in the body part 9. A steel ball 14 and a liquid inlet spring 16 are arranged in the steel ball groove 13. The two ends of the liquid inlet spring 16 respectively press against the steel ball 14 and the inner wall of the steel ball groove 13. One end of the steel ball 14 extends out of the steel ball groove 13, and one end of the piston rod extends into the active cavity 7 to press against the steel ball 14. Specifically, in the present design, in order to reduce the noise during the operation of the oil return pump, an oil hole 5 with a slope structure 6 with a certain slope is opened on the piston cover 1, so that the brake fluid can be released more concentratedly, which is conducive to emptying the air in the pipeline and reducing the working noise; the lip sealing part 10 on the plunger head 8 is larger than the existing technology, so that the sealing performance becomes better as the oil pressure in the pump chamber increases, and in the present design, the plunger head 8 is made of PEEK material, which has good resistance to brake fluid and wear resistance, and can significantly improve the service life of the pump.

[0020] Furthermore, a guide end 15 is formed on the groove wall of the steel ball groove 13 away from the steel ball 14, and the liquid inlet spring 16 is sleeved on the guide end 15. The spring connecting portion 11 is formed on the end of the main body 9 close to the piston cover 1. A return spring 12 is sleeved on the spring connecting portion 11. The two ends of the return spring 12 respectively press against the inner wall of the active cavity 7 and the main body 9 of the liquid outlet steel ball seat 3, and a gap of 2 mm is formed between the return spring and the inner wall of the active cavity. Specifically, in this embodiment, by providing the guide end 15 and the return spring 12, it can be ensured that the steel ball 14 is always in the correct position during the operation of the plunger head 8, thereby ensuring the sealing effect. The protruding design of the guide end 15 helps the liquid inlet spring 16 to remain stable during movement, avoiding the failure of the steel ball 14 seal due to offset. The piston rod 4, steel ball 14, liquid inlet spring 16 and plunger head body 8 together constitute a liquid inlet assembly. In the working state, the liquid inlet assembly reciprocates in the active cavity 7 inside the steel ball seat. When the liquid inlet assembly moves toward one end of the piston cover 1, the pressure inside the active cavity 7 increases, causing the steel ball 14 to cling to the piston rod 4; when the liquid inlet assembly moves toward the end away from the piston cover 1, the pressure flowing through the oil hole 22 increases, pushing the steel ball 14 open.

[0021] Furthermore, the piston cover 1 has a cover connection end 17, and the liquid outlet steel ball seat 3 is provided with a connection groove 18 at one end close to the piston cover 1. The liquid outlet steel ball 2 is arranged in the connection groove 18, and the connection groove 18 is connected to the active chamber 7. The cover connection end 17 extends into the connection groove 18 and is interference-fitted with the liquid outlet steel ball seat 3. A liquid inlet spring groove 19 is provided on the cover connection end, and a liquid inlet spring 20 is provided in the liquid inlet spring groove 19. The two ends of the liquid inlet spring 20 respectively press against the liquid outlet steel ball 2 and the groove wall of the liquid inlet spring groove 19. Specifically, in this embodiment, by optimizing the connection structure between the piston cover 1 and the liquid outlet steel ball seat 3, the sealing performance and working stability of the return oil pump are further improved. The provision of the liquid inlet spring 20 enables the liquid outlet steel ball 2 to maintain appropriate pre-pressure when the pump is working, ensuring good contact between the liquid outlet steel ball 2 and the plunger head 8, thereby effectively preventing the brake fluid from flowing back in the pump chamber and further reducing noise.

[0022] Furthermore, a filter screen 21 is provided on the side of the liquid outlet steel ball seat 3 away from the piston cover 1. Specifically, in this embodiment, the filter screen 21 is provided on the outside of the liquid outlet steel ball seat 3 to filter impurities in the brake fluid, ensuring the cleanliness of the brake fluid, thereby extending the service life of the oil return pump and improving its operating stability. A star-shaped sealing ring 23 and a retaining ring 24 are sequentially provided on the side of the filter screen away from the liquid outlet steel ball seat 3 to ensure the fixation of the filter screen 21 and the sealing effect of the pump body after assembly.

[0023] Furthermore, the piston rod 4 is provided with a rod oil hole 22 having a diameter of 3.2 mm. Specifically, in this embodiment, the provision of the rod oil hole 22 with a diameter of 3.2 mm on the piston rod 4 ensures smooth flow of brake fluid within the pump. Furthermore, the diameter of the rod oil hole 22 is larger than that of the rod oil hole 22 on the piston rod 4 in the prior art, further increasing the oil intake and improving the pumping efficiency of the oil return pump.

[0024] Furthermore, the wire diameter of the liquid inlet spring 16 is 0.9 mm. Specifically, in this embodiment, by selecting a liquid inlet spring 16 with a wire diameter of 0.9 mm, the spring can ensure sufficient elasticity to maintain close contact between the piston rod 4 and the steel ball 14, while avoiding excessive tension that would cause unnecessary wear and noise. In addition, the thinner wire diameter helps reduce the space occupied by the spring, making the entire oil return pump structure more compact.

[0025] Furthermore, the outer diameter of the main body 9 of the plunger head 8 is 9.5 mm. Specifically, in this embodiment, by optimizing the outer diameter of the main body 9 of the plunger head 8 to 9.5 mm, the plunger head 8 can be ensured to have sufficient stability in the active chamber 7, while improving the performance of the oil return pump and the oil extraction efficiency.

[0026] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency noise-reducing oil return pump, comprising a pump body, characterized in that: The pump body consists of a piston cover, a liquid outlet steel ball seat and a piston rod. The piston cover is arranged on one side of the liquid outlet steel ball seat. An oil hole is arranged on the piston cover. The hole wall of the oil hole has a slope structure. An active cavity is formed in the liquid outlet steel ball seat, and a plunger head is arranged in the active cavity.

2. The high-efficiency noise-reducing oil return pump according to claim 1 is characterized in that: The plunger head includes a main body, a lip-shaped sealing portion, a spring connecting portion and a piston contact portion. The lip-shaped sealing portion is sealed with the inner wall of the active chamber. A steel ball groove is formed in the main body. A steel ball and a liquid inlet spring are arranged in the steel ball groove. The two ends of the liquid inlet spring respectively press against the steel ball and the inner wall of the steel ball groove. One end of the steel ball extends out of the steel ball groove, and one end of the piston rod extends into the active chamber to press against the steel ball.

3. The high-efficiency noise-reducing oil return pump according to claim 2 is characterized in that: A guide end is formed by a protrusion on the groove wall on the side of the steel ball groove away from the steel ball, and the liquid inlet spring is sleeved on the guide end. The spring connecting part is protruded and formed at one end of the main body close to the piston cover. A return spring is sleeved on the spring connecting part. The two ends of the return spring respectively press against the inner wall of the active cavity and the main body of the liquid outlet steel ball seat, and a gap of 2 mm is formed between the return spring and the inner wall of the active cavity.

4. The high-efficiency noise-reducing oil return pump according to claim 1 is characterized in that: The piston cover has a cover connecting end, and a connecting groove is provided at one end of the liquid outlet steel ball seat close to the piston cover. A liquid outlet steel ball is arranged in the connecting groove. The connecting groove is connected to the active cavity. The cover connecting end extends into the connecting groove and is interference fit with the liquid outlet steel ball seat. A liquid inlet spring groove is provided on the cover connecting end, and a liquid inlet spring is arranged in the liquid inlet spring groove. The two ends of the liquid inlet spring respectively press against the liquid outlet steel ball and the groove wall of the liquid inlet spring groove.

5. The high-efficiency noise-reducing oil return pump according to claim 1 is characterized in that: A filter screen is sleeved on one side of the liquid outlet steel ball seat away from the piston cover.

6. The high-efficiency noise-reducing oil return pump according to claim 1 is characterized in that: The piston rod is provided with a rod oil hole, and the diameter of the rod oil hole is 3.2 mm.

7. The high-efficiency noise-reducing oil return pump according to claim 2, characterized in that: The wire diameter of the liquid inlet spring is 0.9 mm.

8. The high-efficiency noise-reducing oil return pump according to claim 1 is characterized in that: The outer diameter of the main body of the plunger head is 9.5 mm.

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