A proportional pressure control valve and a hydraulic system

Abstract

The present invention discloses a proportional pressure control valve and a hydraulic system, and relates to the field of valve technology. The proportional pressure control valve comprises: a first valve core is arranged in a valve sleeve, the first valve core is slidably connected with the valve sleeve in the axial direction of the valve sleeve, and a first inlet and a first outlet are arranged on the valve sleeve; a driving unit is transmission-connected with the first valve core through a first elastic member, the deformation direction of the first elastic member is arranged along the axial direction of the valve sleeve, and the driving unit applies a first force to the first valve core through the first elastic member; a pressure supply unit applies a second force to the first valve core; a first damping unit applies a third force to the first valve core; the first, second and third forces are all arranged along the axial direction of the valve sleeve, the first and second forces are in opposite directions, and the second and third forces are in the same direction; the first damping unit is arranged in the present invention to realize rapid pressure reduction and opening, slow pressure increase and closing of the proportional pressure control valve, thereby reducing the hydraulic shock caused by the working medium to the proportional pressure control valve.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to a proportional pressure control valve and a hydraulic system. Background Art

[0002] In the prior art, the proportional pressure control valve is often damaged by hydraulic shock during opening, closing and pressure regulation. Therefore, how to reduce the hydraulic shock of the proportional pressure control valve during use has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0003] The object of the present invention is to provide a proportional pressure control valve and a hydraulic system to reduce the hydraulic shock to which the proportional pressure control valve of the present invention is subjected during use.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a proportional pressure control valve, the proportional pressure control valve comprising:

[0006] A valve sleeve, wherein a first valve core is disposed in the valve sleeve, the first valve core is slidably connected to the valve sleeve in the axial direction of the valve sleeve, a valve sleeve cavity is disposed in the valve sleeve, and a first inlet and a first outlet connected to the valve sleeve cavity are disposed on the valve sleeve;

[0007] a driving unit, wherein the driving unit is drivingly connected to the first valve core through a first elastic member, the deformation direction of the first elastic member is arranged along the axial direction of the valve sleeve, and the driving unit applies a first force to the first valve core through the first elastic member;

[0008] a pressure supply unit, the pressure supply unit being in communication with the first inlet, and the pressure supply unit applying a second force to the first valve core;

[0009] a first damping unit, wherein the first damping unit applies a third force to the first valve core;

[0010] The first acting force, the second acting force and the third acting force are all arranged along the axial direction of the valve sleeve, the first acting force and the second acting force are in opposite directions, and the second acting force and the third acting force are in the same direction;

[0011] Wherein, when the pressure at the first inlet is less than a set value, the proportional pressure control valve is in a pressurized state, and under an external force, the driving unit increases the first force so that the first force is greater than the sum of the second force and the third force, and the first force causes the first valve core to move in a first direction, and the first valve core gradually blocks the first inlet, and after the pressure at the first inlet meets the set value, under an external force, the driving unit reduces the first force so that the first force is equal to the sum of the second force and the third force, so as to maintain the pressure at the first inlet at the set value;

[0012] When the pressure at the first inlet is greater than the set value, the proportional pressure control valve is in a pressure reducing state. Under the external force, the driving unit reduces the first force so that the first force is less than the sum of the second force and the third force. The second force and the third force cause the first valve core to move in a second direction, and the first valve core gradually releases the blockage of the first inlet. After the pressure at the first inlet meets the set value, under the external force, the driving unit increases the first force so that the first force is equal to the sum of the second force and the third force, so as to maintain the pressure at the first inlet at the set value.

[0013] Preferably, the force applied by the driving unit to the first elastic member is in a linear relationship with the compression amount of the first elastic member.

[0014] Preferably, the first damping unit includes a second elastic member and / or a one-way damper.

[0015] Preferably, the proportional pressure control valve further includes: a first valve body, the first end of the valve sleeve is located in the first valve body, and the valve sleeve, the drive unit, the first elastic member, the pressure supply unit and the first damping unit are all arranged to avoid the first valve body.

[0016] Preferably, the first end of the first valve core is slidably matched with the valve sleeve, and the second end of the first valve core extends out of the first end of the valve sleeve;

[0017] Wherein, the force applied by the driving unit to the first elastic member is arranged along the axial direction of the valve sleeve;

[0018] Alternatively, the force applied by the drive unit to the first elastic member is arranged along the circumference of the valve sleeve, a transmission seat is provided between the drive unit and the first elastic member, the output shaft of the drive unit is threadedly connected to the transmission seat, and the transmission seat and the first valve body are slidably matched along the axial direction of the first valve body.

[0019] Preferably, the first damping unit is provided between the driving unit and the first valve core, and the first damping unit includes:

[0020] a second valve body, the second valve body is located in the first valve body, the second valve body and the first valve body are slidably matched in the axial direction of the first valve body, the first end of the second valve body is arranged close to the second end of the first valve core, a second valve body cavity is arranged in the second valve body, and a second inlet and a second outlet are arranged on the second valve body;

[0021] a second valve core, the second valve core being movably disposed in the second valve body along an axial direction of the second valve body;

[0022] a third elastic member, the third elastic member being located between the second valve core and the first end of the second valve body, the third elastic member applying a fourth force to the second valve core, the fourth force causing the second valve core to block the second inlet;

[0023] A first valve body cavity is provided in the first valve body, a working medium is stored in the first valve body cavity, the working medium exerts a fifth force on the second valve body, and the second inlet and the second outlet are both in communication with the second valve body cavity and the first valve body cavity;

[0024] When the first valve core moves toward the second direction, the direction of the fourth force is opposite to the direction of the fifth force, the fifth force is greater than the fourth force, and the fifth force causes the second valve core to move in a direction away from the second inlet, thereby releasing the blockage of the second inlet;

[0025] When the first valve core moves toward the first direction, the direction of the fourth force is the same as the direction of the fifth force, and the fourth force and the fifth force enable the second valve core to keep blocking the second inlet.

[0026] Preferably, the first end of the second valve body abuts against the second end of the first valve core, and an installation error tolerance area is provided on the second end of the first valve core;

[0027] And / or, a sealing member is provided between the valve sleeve and the first valve body;

[0028] And / or, a first mounting surface is provided on the outer side of the valve sleeve, and a second mounting surface matching the first mounting surface is provided in the first valve body.

[0029] In addition, the present invention also provides a hydraulic system, which includes the proportional pressure control valve.

[0030] Compared with the prior art, the present invention has achieved the following technical effects:

[0031] In the present invention, a first valve core is provided in the valve sleeve, the valve core and the valve sleeve are slidably connected in the axial direction of the valve sleeve, a valve sleeve cavity is provided in the valve sleeve, and a first inlet and a first outlet communicated with the valve sleeve cavity are provided on the valve sleeve; a driving unit is transmission-connected with the first valve core through a first elastic member, a deformation direction of the first elastic member is arranged along the axial direction of the valve sleeve, the driving unit applies a first force to the first valve core through the first elastic member, a pressure unit is connected to the first inlet, the pressure unit applies a second force to the first valve core, and the first damping unit applies a third force to the first valve core; the first force, the second force and the third force are all arranged along the axial direction of the valve sleeve, the first force and the second force are in opposite directions, and the second force and the third force are in the same direction;

[0032] Based on the above structure, when the pressure at the first inlet is less than the set value, under external force, such as by manually adjusting the driving unit or by adjusting the driving unit by a controller connected to the driving unit signal, the driving unit increases the first force applied to the first valve core through the first elastic member, so that the first force is greater than the sum of the second force and the third force, so that the first valve core moves in the first direction under the first force, gradually blocks the first inlet, and increases the pressure at the first inlet. When the pressure at the first inlet reaches the set value, under external force, the driving unit reduces the first force, so that the first force is equal to the sum of the second force and the third force, and the pressure at the first inlet is maintained at the set value;

[0033] When the pressure at the first inlet is greater than the set value, under the external force, the driving unit reduces the first force, making the first force less than the sum of the second force and the third force, so that the first valve core moves in the second direction under the second force and the third force, gradually releasing the blockage of the first inlet, reducing the pressure at the first inlet, and after the pressure at the first inlet reaches the set value, under the external force, the driving unit reduces the first force, making the first force equal to the sum of the second force and the third force, and maintaining the pressure at the first inlet at the set value;

[0034] It can be seen that the present invention can adjust the pressure at the first inlet through the cooperation of the driving unit, the first elastic member, the pressure supply unit and the first damping unit, so that the proportional pressure control valve in the present invention can be applied to hydraulic pressure adjustment under various pressure conditions (such as low-pressure hydraulic system and ultra-high-pressure hydraulic system);

[0035] At the same time, when the second forces of the proportional pressure control valve provided with the first damping unit and the proportional pressure control valve without the first damping unit are the same in magnitude and the first force is adjusted down to the same value, compared with the second force alone, the second force and the third force can apply greater power and acceleration to the first valve core moving in the second direction, so that the first valve core can move to the set position in the second direction at a faster speed, and the pressure at the first inlet is reduced to the set value in a shorter time, thereby accelerating the pressure reduction and opening speed of the proportional pressure control valve in the present invention, and reducing the problem that the high second force acts on the first inlet for a long time due to the slow opening speed of the proportional pressure control valve, causing hydraulic shock to the first inlet, the first valve core and other structures of the proportional pressure control valve, and causing damage;

[0036] Correspondingly, when the second forces of the proportional pressure control valve provided with the first damping unit and the proportional pressure control valve not provided with the first damping unit are the same in magnitude and the first force is adjusted to the same value, compared with the case where only the second force exists, when the second force and the third force exist at the same time, the acceleration that the first force can apply to the first valve core moving in the first direction is smaller, thereby slowing down the speed of pressure increase and closing of the proportional pressure control valve, so that the working medium entering from the first inlet can have more sufficient time to be discharged from the first outlet, the flow rate of the working medium can gradually decrease, and the pressure can drop steadily, thereby alleviating the problem that the proportional pressure control valve closes too quickly, causing the working medium to continuously impact the first outlet due to inertia, causing hydraulic shock to the first outlet and other structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0038] Figure 1 It is a structural schematic diagram of a proportional pressure control valve;

[0039] Figure 2 is a schematic diagram of a longitudinal section of a first damping unit;

[0040] Among them, 1. valve sleeve; 2. first valve core; 3. first valve body; 4. first damping unit; 5. first elastic member; 6. transmission seat; 7. transmission screw; 8. connecting seat; 9. bearing; 10. end cover; 11. coupling sleeve; 12. support; 13. drive unit; 14. valve seat; 15. second valve core; 16. third elastic member; 17. sliding seat; 18. first inlet; 19. first outlet; 20. second inlet; 21. second outlet; 22. sealing member; 23. installation tolerance zone. DETAILED DESCRIPTION

[0041] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 1 , Figure 2 As shown, the present invention discloses a proportional pressure control valve, which comprises: a valve sleeve 1, a first valve core 2 is arranged in the valve sleeve 1, the first valve core 2 is slidably connected with the valve sleeve 1 in the axial direction of the valve sleeve 1, a valve sleeve cavity is arranged in the valve sleeve 1, and a first inlet 18 and a first outlet 19 which are connected with the valve sleeve cavity are arranged on the valve sleeve 1; a driving unit 13, the driving unit 13 is transmission-connected with the first valve core 2 through a first elastic member 5, the deformation direction of the first elastic member 5 is arranged along the axial direction of the valve sleeve 1, and the driving unit 13 applies a first force to the first valve core 2 through the first elastic member 5; a pressure supply unit, the pressure supply unit is connected with the first inlet 18, and the pressure supply unit applies a second force to the first valve core 2; a first damping unit 4, and the first damping unit 4 applies a third force to the first valve core 2; the first force, the second force and the third force are all arranged along the axial direction of the valve sleeve 1, the first force and the second force are in opposite directions, and the second force and the third force are in the same direction;

[0044] When the pressure at the first inlet 18 is less than the set value, the proportional pressure control valve is in a pressurized state. Under the external force, the driving unit 13 increases the first force so that the first force is greater than the sum of the second force and the third force. The first force causes the first valve core 2 to move in the first direction, and the first valve core 2 gradually blocks the first inlet 18. After the pressure at the first inlet 18 meets the set value, under the external force, the driving unit 13 reduces the first force so that the first force is equal to the sum of the second force and the third force, so as to maintain the pressure at the first inlet 18 at the set value.

[0045] When the pressure at the first inlet 18 is greater than the set value, the proportional pressure control valve is in a pressure reduction state. Under the external force, the driving unit 13 reduces the first force, making the first force less than the sum of the second force and the third force. The second force and the third force cause the first valve core 2 to move in the second direction, and the first valve core 2 gradually releases the blockage of the first inlet 18. After the pressure at the first inlet 18 meets the set value, under the external force, the driving unit 13 increases the first force, making the first force equal to the sum of the second force and the third force, so as to maintain the pressure at the first inlet 18 at the set value. The set value refers to the pressure value required to be reached at the first inlet 18 according to the working condition requirements.

[0046] It can be seen from the above content that the present invention can achieve the regulation of the pressure at the first inlet 18 through the cooperation of the drive unit 13, the first elastic member 5, the pressure supply unit and the first damping unit 4, which makes the proportional pressure control valve in the present invention suitable for hydraulic regulation under various pressure conditions, such as low-pressure hydraulic systems and ultra-high-pressure hydraulic systems (the hydraulic pressure of the ultra-high-pressure hydraulic system is greater than 50MPa, or even greater than 100MPa); and the proportional pressure control valve in the present invention can be used in a hydraulic environment of hydraulic oil, water or other types of working media.

[0047] At the same time, when the second forces of the proportional pressure control valve provided with the first damping unit 4 and the proportional pressure control valve without the first damping unit 4 are the same in magnitude and the first force is adjusted down to the same value, compared with the second force alone, the second force and the third force can apply greater power and acceleration to the first valve core 2 to move in the second direction, so that the first valve core 2 can move in the second direction to the set position at a faster speed, and the pressure at the first inlet 18 is reduced to the set value in a shorter time, thereby accelerating the speed of pressure reduction and opening of the proportional pressure control valve in the present invention, and reducing the problem that the high second force acts on the first inlet 18 for a long time due to the slow opening speed of the proportional pressure control valve, causing hydraulic shock to the first inlet 18, the first valve core 2 and other structures of the proportional pressure control valve, thereby causing damage;

[0048] Correspondingly, when the second forces of the proportional pressure control valve provided with the first damping unit 4 and the proportional pressure control valve without the first damping unit 4 are the same in magnitude and the first force is adjusted to the same value, compared with the case where only the second force exists, when the second force and the third force exist at the same time, the first force in the present invention can apply a smaller acceleration to the first valve core 2 moving in the first direction, thereby slowing down the speed of pressure increase and closing of the proportional pressure control valve, so that the working medium entering from the first inlet 18 can have more sufficient time to be discharged from the first outlet 19, the flow rate of the working medium can gradually decrease, and the pressure can drop steadily, thereby alleviating the problem that the proportional pressure control valve closes too quickly, causing the working medium to continuously impact the first outlet 19 due to inertia, causing hydraulic shock to the first outlet 19 and other structures.

[0049] The drive unit 13 in the present invention can specifically be a structure such as a cylinder, an electric push rod, etc. that can apply a first force to the first valve core 2 and can output a greater output force than the proportional solenoid in the electro-hydraulic proportional pressure control valve in the prior art (due to the limitations of the supply current and the size of the proportional solenoid, the proportional solenoid in the electro-hydraulic proportional servo valve in the prior art is difficult to output a larger output force).

[0050] On the one hand, the first elastic member 5 transmits the force of the drive unit 13 to the first valve core 2. On the other hand, because the second end of the first valve core 2 is connected to the drive unit 13 through the first elastic member 5, and the first elastic member 5 is elastic, the first elastic member 5 can be deformed along the axial direction of the valve sleeve 1, which enables the first valve core 2 to move in the second direction when the sum of the second force and the third force is greater than the first force, laying a foundation for the opening and pressure reduction of the proportional pressure control valve; if the first valve core 2 and the output end of the drive unit 13 are directly connected, since the drive unit 13 cannot move, the drive unit provides rigid support for the first valve core 2. In this way, even when the sum of the second force and the third force is greater than the first force, the rigid support of the drive unit 13 to the first valve core 2 prevents the first valve core 2 from moving in the second direction, causing the proportional pressure control valve to fail to open and reduce the pressure.

[0051] The first elastic member 5 may be a spring or other elastic structure. The pressure supply unit may be a pump or a pipeline provided with a pump, etc., which conveys a pressurized medium to the first valve core 2, and the pressurized medium applies a second force to the first valve core 2. The force applied by the drive unit 13 to the first elastic member 5 is linearly related to the compression of the first elastic member 5, and the compression of the first elastic member 5 is linearly related to the first force applied by the drive unit 13 to the first valve core through the first elastic member 5. This allows the operator to adjust the amplitude of the drive unit 13, or the controller connected to the signal of the drive unit 13 adjusts the electrical modulation signal (voltage or current signal) of the drive unit 13, which is proportional to the first force applied by the drive unit 13 to the first valve core 2 through the first elastic member 5, thereby realizing the "proportional pressure control" of the proportional pressure control valve in the present invention.

[0052] The first damping unit 4 can be arranged between the driving unit 13 and the first valve core 2. In this case, the first damping unit 4 can be arranged at an end of the first elastic member 5 close to the first valve core 2, or at an end of the first elastic member 5 away from the first valve core 2; alternatively, the first damping unit 4 may not be arranged between the driving unit 13 and the first valve core 2, so as to ensure that the first damping unit 4 can apply a third force to the first valve core 2; the specific setting method depends on the working conditions.

[0053] The first damping unit 4 has a variety of settings. For example, the first damping unit 4 includes a second elastic member and / or a one-way damper whose force direction is the same as the second force; when the first damping unit 4 is a second elastic member, the second elastic member needs to be arranged to avoid the first elastic member 5 to ensure that their respective functions are smoothly realized. The second elastic member can be a spring or other elastic structure, and the one-way damper can be a one-way damper in the patent document CN107965545B. It should be noted that the third force of the first damping unit needs to be large enough but not too large, so as to realize the rapid opening, pressure reduction and slow closing and pressure increase functions of the proportional pressure control valve under the cooperation of the pressure supply unit, the drive unit 13 and the first elastic member 5, and the first damping unit 4 is not limited to the second elastic member or the one-way damper, and can also be other structures that can meet the condition of "needing to be large enough but not too large, so as to realize the rapid opening and slow closing functions of the proportional pressure control valve under the cooperation of the pressure supply unit, the drive unit 13 and the first elastic member 5".

[0054] like Figure 1 , Figure 2As shown, the proportional pressure control valve in the present invention also includes: a first valve body 3, the first end of the valve sleeve 1 is located in the first valve body 3, and the pressure supply unit, the first elastic member 5, the first valve core 2, the first inlet 18, the first outlet 19, and the drive unit 13 are all arranged to avoid the first valve body 3. The first valve body 3 plays a role in supporting, positioning and installing the valve sleeve 1, the first valve core 2 and other structures, and the first valve body 3 and the first valve core 2 and other structures are installed at the desired position through the first valve body 3. The valve sleeve 1, the first elastic member 5, the first valve core 2, the pressure supply unit, the first damping unit 4, and the drive unit 13 are all arranged to avoid the first valve body 3, which means that the first valve body 3 and the pressure supply unit, the first elastic member 5, the first valve core 2, the valve sleeve 1, the first damping unit 4, and the drive unit 13 will not interfere with the realization of their respective functions.

[0055] like Figure 1 , Figure 2 As shown, the first end of the first valve core 2 is slidably matched with the valve sleeve 1, and the second end of the first valve core 2 extends out of the first end of the valve sleeve 1, that is, the second end of the first valve core 2 is located in the first valve body 3, and the second end of the first valve core 2 can extend out of the first valve body 3 and be connected to the first elastic member 5, or the output shaft of the drive unit 13 is deep into the first valve body 3 and is connected to the first valve body 3 through the first elastic member 5. The specific setting depends on the working conditions.

[0056] At this time, different settings are provided according to different types of the driving unit 13. Specifically, when the force applied by the driving unit 13 to the first elastic member 5 is arranged along the axial direction of the first valve body 3, the driving unit 13 is a device such as an electric push rod or a cylinder that can output a force along the axial direction of the first shaft body. In this way, a first force is formed by the force output by the driving unit 13 and the force of the first elastic member 5, so that the first valve core 2 has a tendency to move in the first direction.

[0057] When the force applied by the drive unit 13 to the first valve core 2 is along the circumferential direction of the valve sleeve 1, that is, the first valve core 2 has a tendency to drive the first elastic member 5 and the first valve core 2 to rotate (at this time, the drive unit 13 can be a servo motor or other equipment that can drive the first elastic member 5 to rotate), a transmission seat 6 is provided between the drive unit 13 and the first elastic member 5, and the output shaft of the drive unit 13 is threadedly connected to the transmission seat 6, and the transmission seat 6 and the first valve body 3 slide in the axial direction of the first valve body 3. In this way, when the drive unit 13 is started, the drive unit 13 has a tendency to drive the transmission seat 6 to rotate, but because the first valve body 3 and the transmission seat 6 slide in the axial direction of the first valve body 3, the rotation of the transmission seat 6 is restricted, so that the transmission seat 6 can only move in the first direction or the second direction under the drive of the drive unit 13, and then drive the first valve core 2 to move in the first direction or the second direction. Figure 1 , Figure 2As shown, in the present invention, a connecting seat 8, an end cover 10, and a support 12 are sequentially provided at one end of the first valve body 3 away from the valve sleeve 1 in a direction away from the valve sleeve 1, and a driving unit 13 is provided on the support 12. The output shaft of the driving unit 13 passes through the support 12, and a coupling sleeve 11 (the coupling sleeve can be understood as a coupling) is sleeved on the output shaft of the driving unit 13. The coupling sleeve 11 is connected to the driving screw 7, and the driving screw 7 passes through the end cover 10 and the connecting seat 8 in sequence and is threadedly connected to the driving seat 6. A bearing 9 is provided in the connecting seat 8 and is located between the driving screw 7 and the connecting seat 8, and an interference fit is formed between the bearing 9 and the driving screw 7.

[0058] like Figure 1 , Figure 2 As shown, a first damping unit 4 is provided between the driving unit 13 and the first valve core 2, and the first damping unit 4 includes: a second valve body, the second valve body is located in the first valve body 3, the second valve body and the first valve body 3 are slidably matched in the axial direction of the first valve body 3, the first end of the second valve body is arranged close to the second end of the first valve core 2, a second valve body cavity is provided in the second valve body, and a second inlet 20 and a second outlet 21 are provided on the second valve body; the second inlet 20 and the second outlet 21 are both connected with the second valve body cavity and the first valve body cavity; a second valve core 15, the second valve core 15 is movably provided in the second valve body along the axial direction of the second valve body; a third elastic member 16, the third elastic member 16 is located between the second valve core 15 and the first end of the second valve body, the third elastic member 16 applies a fourth force to the second valve core 15, and the fourth force causes the second valve core 15 to block the second inlet 20; a first valve body cavity is provided in the first valve body 3, a working medium is stored in the first valve body cavity, and the working medium applies a fifth force to the second valve body; wherein, when the first valve core 2 moves in the second direction At the initial stage of movement, the direction of the fourth force is opposite to that of the fifth force, and the fifth force is greater than the fourth force. The fifth force causes the second valve core 15 to move in the direction away from the second inlet 20, i.e., the first direction, gradually releasing the blockage of the second inlet 20, and reducing the resistance of the working medium located at the end of the first valve core 2 facing the second direction to the movement of the first valve core 2 in the second direction. Therefore, although the direction of the fifth force is opposite to that of the second force, it still has the effect of increasing the acceleration of the first valve core 2 moving in the second direction. Therefore, the fifth force at this time can be regarded as the third force mentioned above; when the first valve core 2 moves in the first direction at the initial stage, the direction of the fourth force is the same as that of the fifth force, both of which are the second direction. The fourth force and the fifth force cause the second valve core 15 to maintain the blockage of the second inlet 20. At this time, the fifth force has the effect of slowing down the acceleration of the first valve core 2 moving in the first direction. Therefore, the fifth force at this time can also be regarded as the third force. The third elastic member 16 can be a spring or other structure.

[0059] The force applied by the working medium in the first valve body cavity near the first end of the second valve body to the first end of the second valve body is recorded as A, and the force applied by the working medium in the first valve body cavity near the second end of the second valve body to the second end of the second valve body is recorded as B; when the first valve core 2 moves in the second direction, the second valve body is arranged closer to the valve sleeve 1 under the action of the driving unit 13, which makes the working medium in the first valve body cavity near the first end of the second valve body more than the working medium in the first valve body cavity near the second end of the second valve body. At this time, A>B, the fifth force is AB, and the direction of the fifth force is the same as that of the fourth force The force direction is opposite to that of the fifth force, and the fifth force is in the first direction. The second valve core 15 can move in the direction away from the second inlet 20, i.e., the first direction, under the fifth force, to release the blockage of the second inlet 20, so that the working medium in the first valve body cavity near the first end of the second valve body can reach the area in the first valve body cavity near the second end of the second valve body through the second inlet 20, the second valve body cavity and the second outlet 21, thereby reducing the pressure difference at both ends of the second valve body, reducing the degree to which the first valve core 2 is prevented from moving in the second direction due to the pressure difference, i.e., the fifth force, and thereby accelerating the opening and pressure reduction rate of the proportional pressure control valve.

[0060] On the contrary, when the first valve core 2 moves in the first direction, because the second valve body is located away from the valve sleeve 1 under the action of the driving unit 13, the working medium in the first valve body cavity near the first end of the second valve body is less than the working medium in the first valve body cavity near the second end of the second valve body. Then, at this time, B>A, the fifth force is BA, and the direction of the fifth force is the same as the direction of the fourth force, both in the second direction. At this time, the second valve core 15 maintains the blockage of the second inlet 20 under the fourth force and the fifth force, and the working medium in the first valve body cavity located in the area of ​​the second valve body close to the valve sleeve 1 can only flow slowly to the gap between the second valve body and the first valve body cavity to the area of ​​the first valve body cavity located in the second valve body away from the valve sleeve 1; in this way, the second valve body, i.e. the first damping unit 4, will slowly move toward the direction close to the valve sleeve 1, i.e. the closed position, under the action of the large pressure difference at both ends of the second valve body.

[0061] like Figure 2 As shown, the second valve body can be assembled by the valve seat 14 and the sliding seat 17, and the space between the valve seat 14 and the sliding seat 17 forms the second valve body cavity. The second end of the first damping unit 4 is in contact with the second end of the first valve core 2, and the second end of the first valve core 2 is provided with an installation tolerance area 23; the installation tolerance area 23 specifically refers to the shape of the second end of the first valve core 2, such as Figure 1 , Figure 2As shown, the installation tolerance zone 23 can be specifically the second end of the first valve core 2 in a conical shape. By setting the second end of the first valve core 2 in a conical shape, the second end of the first valve core 2 and the second valve body have a larger contact surface. In this way, even if there is a certain error in the second end of the first valve core 2, the second end of the first valve core 2 and the second valve body can still be kept in smooth contact, thereby ensuring the smooth opening and closing of the proportional pressure control valve. In addition, the second end of the first valve core 2 can also be set to other shapes, as long as the second end of the first valve core 2 can still maintain contact with the valve body in the presence of a certain processing error, the proportional pressure control valve can be opened and closed.

[0062] And / or, a sealing member 22 is provided between the valve sleeve 1 and the first valve body 3, and the sealing member 22 ensures the sealing between the valve sleeve 1 and the first valve body 3, and the sealing member 22 can be a sealing ring; and / or, a first mounting surface is provided on the outer side of the valve sleeve 1, and a second mounting surface matching the first mounting surface is provided inside the first valve body 3; Figure 1 , Figure 2 As shown, the first mounting surface and the second mounting surface can specifically be step surfaces that fit together, and the first mounting surface and the second mounting surface are not limited to step surfaces, and the first mounting surface and the second mounting surface can also be mounting surfaces of other shapes, as long as the installation positions of the valve sleeve 1 and the first valve body 3 can be determined by the first mounting surface and the second mounting surface.

[0063] And / or, the proportional pressure control valve also includes a controller, the drive unit 13 is connected to the controller signal, the controller outputs a first signal to the drive unit 13, the first signal may specifically be an electrically modulated signal such as a voltage signal or a current signal, the first signal enables the drive unit 13 to adjust the force acting on the first elastic member 5, and then adjust the first force acting on the first elastic member 5 and the drive unit 13 on the first valve core 2.

[0064] In addition, the present invention also provides a hydraulic system, which includes the proportional pressure control valve described above; the hydraulic system can specifically be a device that can apply the proportional pressure control valve described above under different working conditions such as vehicles or factories.

[0065] The "and / or" mentioned in this article refers to the same sentence, the text content before and / or and the text content after and / or can exist at the same time or separately, for example, A and / or B includes the case where A and B exist at the same time, and the case where only A or B exists. And / or has the same meaning as and / or, which will not be repeated here.

[0066] The present invention discloses multiple technical solutions, but does not provide any contrary technical inspiration.

[0067] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A proportional pressure control valve, characterized in that: The proportional pressure control valve comprises: A valve sleeve, wherein a first valve core is disposed in the valve sleeve, the first valve core is slidably connected to the valve sleeve in the axial direction of the valve sleeve, a valve sleeve cavity is disposed in the valve sleeve, and a first inlet and a first outlet connected to the valve sleeve cavity are disposed on the valve sleeve; a driving unit, wherein the driving unit is drivingly connected to the first valve core through a first elastic member, the deformation direction of the first elastic member is arranged along the axial direction of the valve sleeve, and the driving unit applies a first force to the first valve core through the first elastic member; a pressure supply unit, the pressure supply unit being in communication with the first inlet, and the pressure supply unit applying a second force to the first valve core; a first damping unit, wherein the first damping unit applies a third force to the first valve core; The first acting force, the second acting force and the third acting force are all arranged along the axial direction of the valve sleeve, the first acting force is directed toward a first direction, the second acting force is directed toward a second direction, the first direction is opposite to the second direction, and the first direction is the direction in which the first valve core approaches the valve sleeve; The proportional pressure control valve further comprises: a first valve body, a first valve body cavity is provided in the first valve body, a first damping unit is provided between the driving unit and the first valve core, and the first damping unit comprises: a second valve body, the second valve body is located in the first valve body, the second valve body and the first valve body are slidably matched in the axial direction of the first valve body, the first end of the second valve body is arranged close to the second end of the first valve core, a second valve body cavity is arranged in the second valve body, and a second inlet and a second outlet are arranged on the second valve body; the first end of the second valve body abuts against the second end of the first valve core; a second valve core, the second valve core being movably disposed in the second valve body along an axial direction of the second valve body; a third elastic member, the third elastic member being located between the second valve core and the first end of the second valve body, the third elastic member applying a fourth force to the second valve core, the fourth force causing the second valve core to block the second inlet, the fourth force being directed in the second direction; A working medium is stored in the first valve body cavity, and the working medium applies a fifth force to the second valve body. At this time, the third force is the fifth force; and the fifth force is the difference between the force applied by the working medium in the first valve body cavity near the first end of the second valve body to the first end of the second valve body, and the force applied by the working medium in the first valve body cavity near the second end of the second valve body to the second end of the second valve body; The second inlet and the second outlet are both in communication with the second valve body cavity and the first valve body cavity; Wherein, when the first valve core moves toward the second direction, the first valve core and the second valve body are located close to the valve sleeve, and the force applied by the working medium in the first valve body cavity close to the second end of the second valve body to the second end of the second valve body is greater than the force applied by the working medium in the first valve body cavity close to the first end of the second valve body to the first end of the second valve body. At this time, the fifth force is directed toward the first direction, and the fifth force is greater than the fourth force. The fifth force causes the second valve core to move in a direction away from the second inlet, thereby releasing the blockage of the second inlet. When the first valve core moves toward the first direction, the first valve core and the second valve body are at positions away from the valve sleeve, and the force applied by the working medium in the first valve body cavity near the first end of the second valve body to the first end of the second valve body is greater than the force applied by the working medium in the first valve body cavity near the second end of the second valve body to the second end of the second valve body. At this time, the fifth force is toward the second direction, and the fourth force and the fifth force enable the second valve core to keep blocking the second inlet; The working medium in the first valve body cavity located in the first end region of the second valve body can only flow slowly into the region of the first valve body cavity located in the second end of the second valve body through the gap between the second valve body and the first valve body cavity.

2. The proportional pressure control valve according to claim 1, characterized in that: The force applied by the driving unit to the first elastic member is linearly related to the compression amount of the first elastic member.

3. The proportional pressure control valve according to claim 1, characterized in that: The first end of the valve sleeve is located in the first valve body, and the valve sleeve, the driving unit, the first elastic member, the pressure supply unit and the first damping unit are all arranged to avoid the first valve body.

4. The proportional pressure control valve according to claim 3, characterized in that: The first end of the first valve core is slidably matched with the valve sleeve, and the second end of the first valve core extends out of the first end of the valve sleeve; Wherein, the force applied by the driving unit to the first elastic member is arranged along the axial direction of the valve sleeve; Alternatively, the force applied by the drive unit to the first elastic member is arranged along the circumference of the valve sleeve, a transmission seat is provided between the drive unit and the first elastic member, the output shaft of the drive unit is threadedly connected to the transmission seat, and the transmission seat and the first valve body are slidably matched along the axial direction of the first valve body.

5. The proportional pressure control valve according to claim 1, characterized in that: An installation error tolerance area is provided on the second end of the first valve core; And / or, a sealing member is provided between the valve sleeve and the first valve body; And / or, a first mounting surface is provided on the outer side of the valve sleeve, and a second mounting surface matching the first mounting surface is provided in the first valve body.

6. A hydraulic system, characterized in that: The hydraulic system comprises the proportional pressure control valve according to any one of claims 1-5.

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