CN117780616A - Hydraulic pump pressure adjusting mechanism and using method - Google Patents
Hydraulic pump pressure adjusting mechanism and using method Download PDFInfo
- Publication number
- CN117780616A CN117780616A CN202311791788.8A CN202311791788A CN117780616A CN 117780616 A CN117780616 A CN 117780616A CN 202311791788 A CN202311791788 A CN 202311791788A CN 117780616 A CN117780616 A CN 117780616A
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- pressure regulating
- hydraulic pump
- pressure
- screw sleeve
- nut
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 175
- 238000007789 sealing Methods 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
Abstract
The invention discloses a hydraulic pump pressure regulating mechanism and a use method thereof, wherein the hydraulic pump pressure regulating mechanism comprises a shell (1), a pressure regulating valve sleeve (2) is arranged in the shell (1), a pressure regulating valve core (3) is arranged in the pressure regulating valve sleeve (2), a screw sleeve (4) connected with the shell (1) is arranged on one side of the pressure regulating valve core (3), a pressure regulating spring (5) is arranged between the screw sleeve (4) and the pressure regulating valve core (3), one end of the screw sleeve (4) extends out of the shell (1) and is provided with a pressure regulating nut (6), the outer side end of the screw sleeve (4) is closed, and the pressure regulating spring (5) is positioned on the inner side of the pressure regulating screw sleeve (4); the pressure regulating valve core (3) is provided with a first convex ring (7), and one end of the pressure regulating spring (5) is abutted to the first convex ring (7). The invention has the advantages of stable hydraulic pump outlet pressure and low failure rate.
Description
Technical Field
The invention relates to a hydraulic pump pressure regulating mechanism and a using method thereof.
Background
Hydraulic pumps are widely used in open hydraulic systems, which are hydraulic systems in which a hydraulic pump sucks oil from a tank and the oil returns to the tank through a working element of a hydraulic circuit, and the control objective is to ensure that the outlet pressure of the hydraulic pump is maintained at a rated level. In practical application, because the impedance of the hydraulic system of the user and the impedance of the hydraulic test system of the factory are different, and the impedance of the hydraulic system of the user also changes along with the change of the use condition and the use time, the pressure regulating mechanism is required to be arranged on the hydraulic pump to properly regulate the outlet pressure so as to be matched with the control requirement of the system.
The existing pressure regulating mechanism comprises a shell, wherein a pressure regulating valve sleeve is arranged in the shell, a pressure regulating valve core is arranged in the pressure regulating valve sleeve, a threaded sleeve connected with the shell is arranged on one side of the pressure regulating valve core, a pressure regulating spring is arranged between the threaded sleeve and the pressure regulating valve core, the pretightening force of the pressure regulating spring determines the outlet pressure of the hydraulic pump, the pretightening force of the pressure regulating spring is changed by changing the screwing depth of the threaded sleeve, and the pretightening force of the pressure regulating spring determines the outlet pressure of the hydraulic pump. As in the patent publication CN112166674B, the outlet pressure of the hydraulic pump is changed by adjusting the seat cover (i.e., the screw sleeve) to change the preload of the pressure spring (i.e., the pressure adjusting spring).
The oil liquid in the pressure regulating mechanism flows to form certain vibration force, and the threaded sleeve is in threaded connection with the shell, so that axial displacement of the threaded sleeve is formed under the action of the vibration force to change the pretightening force of the pressure regulating spring, the outlet pressure of the hydraulic pump is set to be changed along with the change, and the outlet pressure of the hydraulic pump is unstable.
Therefore, the existing pressure regulating mechanism has the defect that the outlet pressure of the hydraulic pump is unstable.
Disclosure of Invention
The invention aims to provide a hydraulic pump pressure regulating mechanism and a using method thereof. The invention has the advantages of stable hydraulic pump outlet pressure and low failure rate.
The technical scheme of the invention is as follows: the hydraulic pump pressure regulating mechanism comprises a shell, wherein a pressure regulating valve sleeve is arranged in the shell, a pressure regulating valve core is arranged in the pressure regulating valve sleeve, a threaded sleeve connected with the shell is arranged on one side of the pressure regulating valve core, a pressure regulating spring is arranged between the threaded sleeve and the pressure regulating valve core, one end of the threaded sleeve extends out of the shell and is provided with a pressure regulating nut, the outer side end of the threaded sleeve is closed, and the pressure regulating spring is positioned on the inner side of the pressure regulating threaded sleeve.
In the hydraulic pump pressure regulating mechanism, the pressure regulating valve core is provided with a first convex ring, and one end of the pressure regulating spring is abutted against the first convex ring.
In the hydraulic pump pressure regulating mechanism, the outer peripheral surface of the inner side end of the screw sleeve is a cylindrical smooth surface, a first sealing ring is arranged on the outer side of the cylindrical smooth surface, a first annular groove for accommodating the first sealing ring is arranged in the shell, and the outer peripheral surface of the outer side end of the screw sleeve is in threaded connection with the shell.
In the hydraulic pump pressure regulating mechanism, a first spring seat is arranged between the pressure regulating spring and the pressure regulating valve core, a concave cavity is formed in the end face, facing the pressure regulating valve core, of the first spring seat, the bottom surface of the concave cavity is a conical surface, one end of the pressure regulating valve core is inserted into the concave cavity, and the end, inserted into the concave cavity, of the pressure regulating valve core is provided with a spherical surface abutting against the conical surface.
In the hydraulic pump pressure regulating mechanism, a second spring seat is arranged between the pressure regulating spring and the screw sleeve, and the second spring seat is positioned in the screw sleeve.
In the hydraulic pump pressure regulating mechanism, the inner side end of the screw sleeve is in threaded connection with the shell, a second annular groove is formed in the middle of the screw sleeve, and a first sealing ring is arranged in the second annular groove.
In the hydraulic pump pressure regulating mechanism, the screw sleeve is provided with the positioning check ring positioned at the outer side of the shell, the pressure regulating nut is positioned at the outer side of the positioning check ring, the pressure regulating nut is arranged at the outer side of the pressure regulating nut and is connected with the screw sleeve, the outer side end face of the second spring seat is abutted to the inner bottom face of the pressure regulating nut, the outer peripheral face of the second spring seat is provided with the third annular groove, and the second annular groove is internally provided with the second sealing ring.
According to the application method of the hydraulic pump pressure adjusting mechanism, the pre-tightening force of the pressure adjusting spring is changed by changing the axial position of the pressure adjusting screw sleeve, the outlet pressure of the hydraulic pump is adjusted, and the axial position of the pressure adjusting screw sleeve is locked by the pressure adjusting nut, so that the outlet pressure of the hydraulic pump is stable.
According to the application method of the hydraulic pump pressure adjusting mechanism, the pre-tightening force of the pressure adjusting spring is changed by changing the axial position of the pressure adjusting nut, the outlet pressure of the hydraulic pump is adjusted, and the axial position of the pressure adjusting nut is locked by the pressure adjusting nut, so that the outlet pressure of the hydraulic pump is stable.
Compared with the prior art, the invention improves the structure of the pretightening force of the adjusting spring on the basis of the existing pressure adjusting mechanism, and comprises the following steps:
1) The pressure regulating nut is added on the screw sleeve, and the screw sleeve is locked through the pressure regulating nut, so that the pretightening force of the pressure regulating spring is prevented from changing due to axial displacement of the screw sleeve, and the pressure of the outlet of the hydraulic pump is stable.
2) The pressure regulating spring is connected with the pressure regulating valve core through the first spring seat, a concave cavity with a conical surface is arranged on the first spring seat, and a spherical surface is arranged at the end part of the pressure regulating valve core, so that the valve core is hinged with the first spring seat in a spherical mode, smooth movement of the pressure regulating valve core in the pressure regulating valve sleeve is ensured, and the fault rate is reduced.
3) The pressure regulating spring is connected with the pressure regulating nut through the second spring seat, the pressure regulating nut is connected with the threaded sleeve, when the pretightening force of the pressure regulating spring is regulated, the first sealing ring is kept still, the regulating mechanism is ensured not to leak oil at the first sealing ring, the second sealing ring only moves axially and cannot be extruded between the second spring seat and the threaded sleeve, and the regulating mechanism is ensured not to leak oil at the second sealing ring, so that the fault rate of the pressure regulating mechanism is further reduced.
In summary, the present invention has the advantages of stable hydraulic pump outlet pressure and low failure rate.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1.
Fig. 2 is a schematic diagram of the pressure regulating valve core in embodiment 1.
Fig. 3 is a schematic structural diagram of embodiment 2.
Fig. 4 is a schematic diagram of a pressure regulating valve core in example 2.
Fig. 5 is a schematic view of a first spring seat in embodiment 2.
Fig. 6 is a schematic structural diagram of embodiment 3.
FIG. 7 is a cross-sectional view at A-A of example 3.
FIG. 8 is a cross-sectional view of example 3 at B-B.
FIG. 9 is a cross-sectional view of example 3 at C-C.
The marks in the drawings are: the device comprises a shell, a 2-pressure regulating valve sleeve, a 3-pressure regulating valve core, a 4-threaded sleeve, a 5-pressure regulating spring, a 6-pressure regulating nut, a 7-first convex ring, an 8-cylindrical smooth surface, a 9-first sealing ring, a 10-first annular groove, a 11-first spring seat, a 12-concave cavity, a 13-spherical surface, a 14-second spring seat, a 15-second annular groove, a 17-positioning retainer ring, a 18-pressure regulating nut, a 19-third annular groove, a 20-second sealing ring and a 21-fuse hole.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Example 1. The hydraulic pump pressure regulating mechanism, as shown in figures 1 and 2, comprises a shell 1, a pressure regulating valve sleeve 2 is arranged in the shell 1, a pressure regulating valve core 3 is arranged in the pressure regulating valve sleeve 2, a screw sleeve 4 connected with the shell 1 is arranged on one side of the pressure regulating valve core 3, a pressure regulating spring 5 is arranged between the screw sleeve 4 and the pressure regulating valve core 3, and the characteristics are as follows,
one end of the screw sleeve 4 extends out of the shell 1 and is provided with a pressure regulating nut 6, the outer side end of the screw sleeve 4 is closed, and a pressure regulating spring 5 is positioned at the inner side of the pressure regulating screw sleeve 4.
The pressure regulating valve core 3 is provided with a first convex ring 7, and one end of the pressure regulating spring 5 is abutted against the first convex ring 7.
The outer peripheral surface of the inner side end of the screw sleeve 4 is a cylindrical light surface 8, a first sealing ring 9 is arranged on the outer side of the cylindrical light surface 8, a first annular groove 10 for accommodating the first sealing ring 9 is arranged in the shell 1, and the outer peripheral surface of the outer side end of the screw sleeve 4 is in threaded connection with the shell 1.
The method of use of example 1: the pressure regulating nut 6 is loosened, the screw sleeve 4 is rotated, the axial position of the pressure regulating screw sleeve 4 is changed, the pretightening force of the pressure regulating spring 5 is changed, then the pressure regulating nut 6 is screwed down, the axial position of the pressure regulating screw sleeve 4 is locked, and the outlet pressure of the hydraulic pump is stable.
Example 2. The hydraulic pump pressure regulating mechanism comprises a shell 1, a pressure regulating valve sleeve 2 is arranged in the shell 1, a pressure regulating valve core 3 is arranged in the pressure regulating valve sleeve 2, a screw sleeve 4 connected with the shell 1 is arranged on one side of the pressure regulating valve core 3, a pressure regulating spring 5 is arranged between the screw sleeve 4 and the pressure regulating valve core 3,
one end of the screw sleeve 4 extends out of the shell 1 and is provided with a pressure regulating nut 6, the outer side end of the screw sleeve 4 is closed, and a pressure regulating spring 5 is positioned at the inner side of the pressure regulating screw sleeve 4.
A first spring seat 11 is arranged between the pressure regulating spring 5 and the pressure regulating valve core 3, a concave cavity 12 is arranged on the end face, facing the pressure regulating valve core 3, of the first spring seat 11, the bottom surface of the concave cavity 12 is a conical surface, one end of the pressure regulating valve core 3 is inserted into the concave cavity 12, a spherical surface 13 which is abutted to the conical surface is arranged at the end part, inserted into the concave cavity 12, of the pressure regulating valve core 3, and a spherical hinge is formed between the pressure regulating valve core 3 and the first spring seat 11.
A second spring seat 14 is arranged between the pressure regulating spring 5 and the threaded sleeve 4, and the second spring seat 14 is positioned inside the threaded sleeve 4.
The inner side end of the screw sleeve 4 is in threaded connection with the shell 1, a second annular groove 15 is formed in the middle of the screw sleeve 4, a first sealing ring 9 is arranged in the second annular groove 15, and the middle of the screw sleeve 4 is in sliding connection with the shell 1 through the first sealing ring 9.
The method of use of example 2 is the same as that of example 1.
Example 2 and example 1 compare: in embodiment 2, since the spherical hinge is formed between the pressure regulating valve core 3 and the first spring seat 11, when an included angle exists between the axis of the pressure regulating spring 5 and the axis of the pressure regulating valve core 3, the component force generated by the pressure regulating spring 5 in the radial direction is less applied to the pressure regulating valve core 3, so that the pressure regulating valve core 3 is prevented from being jammed in the pressure regulating valve sleeve 2 due to deflection, smooth movement of the pressure regulating valve core 3 in the pressure regulating valve sleeve 2 is ensured, and the failure rate is reduced.
Example 3. On the basis of the embodiment 2, the screw sleeve 4 is provided with a positioning check ring 17 positioned on the outer side of the shell 1, and the screw sleeve 4 is screwed and fixed on the shell 1 through the positioning check ring 17. The pressure regulating nut 6 is located the outside of location retaining ring 17, and the outside of pressure regulating nut 6 is equipped with the pressure regulating nut 18 of connecting swivel nut 4, and the outside terminal surface butt of second spring holder 14 is on the interior bottom surface of pressure regulating nut 18, is equipped with third ring channel 19 on the outer peripheral face of second spring holder 14, is equipped with second sealing washer 20 in the third ring channel 19.
The radial section of the positioning retainer ring 17, the radial section of the pressure regulating nut 6 and the radial section of the end part of the pressure regulating nut 18 are all regular hexagons, and the end parts of the positioning retainer ring 17, the pressure regulating nut 6 and the pressure regulating nut 18 are all provided with a plurality of locking fuse holes 21. The fuses sequentially pass through all the fuse holes 21 and are screwed, so that the threaded sleeve 4, the pressure regulating nut 6 and the pressure regulating nut 18 form an integral structure to prevent loosening.
The method of use of example 3: the pressure regulating nut 6 is unscrewed, the pressure regulating nut 18 is screwed, the axial position of the pressure regulating nut 18 is changed, the pretightening force of the pressure regulating spring 5 is changed, the outlet pressure of the hydraulic pump is regulated to a proper value, the pressure regulating nut 6 is screwed, the axial position of the pressure regulating nut 18 is locked, and the outlet pressure of the hydraulic pump is stable.
Example 3 and example 2 compare: in the embodiment 2, as the screw sleeve 4 is screwed in or out, the first sealing ring 9 is extruded by the inner hole of the shell 1 to deform, and a certain part of the outer circle of the first sealing ring 9 may be extruded into a gap between the screw sleeve 4 and the shell 1, because the filling rate design value of the first sealing ring 9 is generally larger, the screw sleeve 4 is extruded and biased at the first sealing ring 9, the contact part of the extruded and deformed first sealing ring 9 and the shell 1 is taken as a fulcrum, the screw sleeve 4 rotates, serious internal and external thread interference occurs between the screw sleeve 4 and the shell 1 at the screwed joint, the screw sleeve 4 cannot rotate, the outlet pressure of the hydraulic pump cannot be adjusted, and the fault risk exists; meanwhile, the threaded sleeve 4 has radial force under the deformed first sealing ring 9, and interferes with the shell 1 to slide, so that irreparable abrasion is easy to generate, and the risk of oil leakage is increased, namely the risk of failure rate is increased.
In embodiment 3, since the screw sleeve 4 does not need to be screwed, the first sealing ring 9 is prevented from being extruded by the shell 1 to deform, and part of the first sealing ring 9 is prevented from being extruded into a gap between the screw sleeve 4 and the shell 1, so that the outer circle of the pressure regulating screw sleeve 6 is prevented from being extruded to one side, irreparable abrasion is prevented from being generated between the screw sleeve 4 and the shell 1, and the oil leakage risk is reduced. In embodiment 3, the second sealing ring 20 does not rotate circumferentially relative to the second spring seat 14 and only moves axially by rotating the pressure regulating nut 18 to regulate the pre-tightening force of the spring, so that the second sealing ring 20 is not pressed into the gap between the second spring seat 14 and the threaded sleeve 4, and smooth rotation of the pressure regulating nut 18 is ensured, and no oil leakage exists at the second sealing ring 20. The failure rate of example 3 is significantly reduced.
Claims (10)
1. The utility model provides a hydraulic pump pressure adjustment mechanism, includes casing (1), is equipped with air-vent valve cover (2) in casing (1), is equipped with air-vent valve core (3) in air-vent valve cover (2), and one side of air-vent valve core (3) is equipped with swivel nut (4) of connecting casing (1), is equipped with pressure regulating spring (5), its characterized in that between swivel nut (4) and air-vent valve core (3): one end of the screw sleeve (4) extends out of the shell (1) and is provided with a pressure regulating nut (6), the outer side end of the screw sleeve (4) is closed, and a pressure regulating spring (5) is positioned at the inner side of the pressure regulating screw sleeve (4).
2. The hydraulic pump pressure adjustment mechanism of claim 1, wherein: the pressure regulating valve core (3) is provided with a first convex ring (7), and one end of the pressure regulating spring (5) is abutted to the first convex ring (7).
3. The hydraulic pump pressure adjustment mechanism of claim 2, wherein: the outer peripheral surface of the inner side end of the screw sleeve (4) is a cylindrical light surface (8), a first sealing ring (9) is arranged on the outer side of the cylindrical light surface (8), a first annular groove (10) for accommodating the first sealing ring (9) is arranged in the shell (1), and the outer peripheral surface of the outer side end of the screw sleeve (4) is in threaded connection with the shell (1).
4. The hydraulic pump pressure adjustment mechanism of claim 1, wherein: a first spring seat (11) is arranged between the pressure regulating spring (5) and the pressure regulating valve core (3), a concave cavity (12) is formed in the end face, facing the pressure regulating valve core (3), of the first spring seat (11), the bottom surface of the concave cavity (12) is a conical surface, one end of the pressure regulating valve core (3) is inserted into the concave cavity (12), and a spherical surface (13) abutting against the conical surface is arranged at the end portion, inserted into the concave cavity (12), of the pressure regulating valve core (3).
5. The hydraulic pump pressure adjustment mechanism of claim 4, wherein: a second spring seat (14) is arranged between the pressure regulating spring (5) and the screw sleeve (4), and the second spring seat (14) is positioned in the screw sleeve (4).
6. The hydraulic pump pressure adjustment mechanism of claim 5, wherein: the inner side end of the screw sleeve (4) is in threaded connection with the shell (1), a second annular groove (15) is formed in the middle of the screw sleeve (4), and a first sealing ring (9) is arranged in the second annular groove (15).
7. The hydraulic pump pressure adjustment mechanism of claim 6, wherein: the utility model discloses a pressure regulating nut, including shell (1), swivel nut (4), pressure regulating nut (6), second spring holder (14), be equipped with on swivel nut (4) and be equipped with location retaining ring (17) in the shell (1) outside, pressure regulating nut (6) are located the outside of location retaining ring (17), and the outside of pressure regulating nut (6) is equipped with pressure regulating nut (18) of connecting swivel nut (4), and the outside terminal surface butt of second spring holder (14) is on the interior bottom surface of pressure regulating nut (18), is equipped with third ring channel (19) on the outer peripheral face of second spring holder (14), is equipped with second sealing washer (20) in third ring channel (19).
8. The hydraulic pump pressure adjustment mechanism of claim 7, wherein: the radial section of the positioning retainer ring (17), the radial section of the pressure regulating nut (6) and the radial section of the end part of the pressure regulating nut (18) are all regular hexagons, and a plurality of locking fuse holes (21) are formed in the end parts of the positioning retainer ring (17), the pressure regulating nut (6) and the pressure regulating nut (18).
9. The method of using the hydraulic pump pressure adjustment mechanism according to any one of claims 1 to 6, characterized in that: the pre-tightening force of the pressure regulating spring (5) is changed by changing the axial position of the pressure regulating screw sleeve (4), the outlet pressure of the hydraulic pump is regulated, and the axial position of the pressure regulating screw sleeve (4) is locked by the pressure regulating nut (6), so that the outlet pressure of the hydraulic pump is stable.
10. The method of using a hydraulic pump pressure adjustment mechanism according to claim 7 or 8, characterized in that: the pre-tightening force of the pressure regulating spring (5) is changed by changing the axial position of the pressure regulating nut (18), the outlet pressure of the hydraulic pump is regulated, and the axial position of the pressure regulating nut (18) is locked by the pressure regulating nut (6), so that the outlet pressure of the hydraulic pump is stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791788.8A CN117780616A (en) | 2023-12-22 | 2023-12-22 | Hydraulic pump pressure adjusting mechanism and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791788.8A CN117780616A (en) | 2023-12-22 | 2023-12-22 | Hydraulic pump pressure adjusting mechanism and using method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117780616A true CN117780616A (en) | 2024-03-29 |
Family
ID=90390084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311791788.8A Pending CN117780616A (en) | 2023-12-22 | 2023-12-22 | Hydraulic pump pressure adjusting mechanism and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117780616A (en) |
-
2023
- 2023-12-22 CN CN202311791788.8A patent/CN117780616A/en active Pending
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