A reversible pressure-maintaining valve

Abstract

The present invention relates to the field of pressure-maintaining valves, and specifically to a reversible pressure-maintaining valve. It includes a valve body, which is formed with a central axis cavity along the axial direction, and five oil-passing cavities are sequentially formed along the axial direction of the central axis cavity, and also includes: a transfer tube, which is fixedly connected to the valve body and can communicate with two oil-passing cavities arranged at both ends of the central axis cavity; a reversing assembly, which includes a reversing valve core, two piston blocks and a shock-absorbing mechanism, the reversing valve core is arranged coaxially with the central axis cavity, the two piston blocks are respectively fixedly connected coaxially with the reversing valve core and are connected to the dynamic seal of the central axis cavity, the shock-absorbing mechanism is connected to one end of the reversing valve core, and the reversing valve core is formed with four groups of pressure relief holes along the axial direction; two groups of constant pressure assemblies, which are respectively arranged on both sides of the reversing valve core, and each group of constant pressure assemblies respectively includes a blocking sleeve, a pressure relief plug rod and a plurality of groups of pressure relief mechanisms, the blocking sleeve is slidably arranged coaxially with the reversing valve core, the pressure relief plug rod is slidably arranged coaxially with the blocking sleeve, and each group of pressure relief mechanisms is connected to the corresponding pressure relief holes.

Description

Technical Field

[0001] The invention relates to the field of pressure-maintaining valves, and in particular to a reversible pressure-maintaining valve. Background Art

[0002] As an important control element in the hydraulic system, the reversible pressure-maintaining valve has multiple key functions. This type of valve body can connect and disconnect different oil circuits by moving or switching the valve core, thereby meeting the system's different requirements for the direction of hydraulic oil flow.

[0003] However, the movement of the valve core in the traditional reversing pressure-maintaining valve is mostly driven by a connecting rod. At this time, due to the time difference between the connecting rod and the power source during the transmission process, the response speed of the valve core will be lagging, which is not conducive to the rapid conversion of the oil flow direction in the valve body. When the flow direction of the oil changes, the pressure change inside the valve body will generate axial force on the piston and the valve core. This force may cause the piston and the valve core to displace or vibrate, affecting the control accuracy and stability of the valve. Although the existing reversing pressure-maintaining valve uses a pressure detection device to monitor the pressure of each oil chamber inside the valve body, when the pressure fluctuates, the oil chamber required to release the pressure will be different due to the different oil flow directions inside the valve body. Therefore, the existing reversing pressure-maintaining valve can only add a pressure relief device to each oil chamber to ensure the safety of the valve body. At this time, the valve body will have defects such as high cost and overly complex structure due to the excessive load of multiple components. At the same time, due to the influence of the reversing function, the traditional single-channel pressure relief device cannot be used in the reversing pressure-maintaining valve. For this, we need to design a special pressure relief structure to release the excess pressure in the pressure-maintaining valve. Ensure that the pressure relief process is carried out within a safe and controllable range to avoid harm to personnel and the surrounding environment. Summary of the invention

[0004] Based on this, it is necessary to provide a reversible pressure-maintaining valve to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A reversible pressure-maintaining valve comprises a valve body, wherein the valve body is formed with a central axis cavity along the axial direction, and five oil-passing cavities are sequentially formed along the axial direction of the central axis cavity, and further comprises:

[0007] A transfer pipe is fixedly connected to the valve body and can communicate with two oil passage chambers arranged at both ends of the central shaft chamber;

[0008] The reversing assembly includes a reversing valve core, two piston blocks and a shock absorbing mechanism. The reversing valve core is coaxially arranged with the central axis cavity. The two piston blocks are respectively coaxially fixedly connected with the reversing valve core and dynamically sealed with the central axis cavity. The shock absorbing mechanism is connected with one end of the reversing valve core and can dampen the axial movement of the reversing valve core. The reversing valve core is formed with four groups of pressure relief holes arranged in a circumferential direction along the axial direction.

[0009] Two groups of constant pressure components are respectively arranged on both sides of the reversing valve core. Each group of constant pressure components includes a sealing sleeve, a pressure relief rod and several groups of pressure relief mechanisms. The sealing sleeve is slidably arranged coaxially with the reversing valve core, and the pressure relief rod is slidably arranged coaxially with the sealing sleeve. Each group of pressure relief mechanisms is connected to the corresponding pressure relief hole.

[0010] Furthermore, the five oil-passing chambers are, in sequence, the first inner chamber, the second inner chamber, the third inner chamber, the fourth inner chamber and the transfer chamber in the direction away from the shock absorbing mechanism. A transition chamber is formed between two adjacent oil-passing chambers. Each piston block is dynamically sealed with the corresponding transition chamber. The first inner chamber can be connected to the transfer chamber through a transfer tube.

[0011] Furthermore, the reversing assembly also includes a transfer curved plate and two limit slide rails. The two limit slide rails are symmetrically arranged on both sides of the transfer tube and fixedly connected to the valve body. The lower end of the transfer curved plate is fixedly connected to the reversing valve core, and the upper end is abutted against the dynamic seal of the transfer tube. An avoidance hole is formed on the upper part of the transfer curved plate, and the avoidance hole is connected to the transfer tube.

[0012] Furthermore, the reversing assembly also includes an electromagnet, an electromagnetic generator, a permanent magnet and a limit sleeve, and the constant pressure assembly also includes a first cylinder and a second cylinder. The electromagnetic generator is fixedly connected to an end of the valve body away from the shock absorbing mechanism, the electromagnet is fixedly connected to an output end of the electromagnetic generator, the limit sleeve is arranged on a side of the electromagnet away from the valve body and is fixedly connected to the valve body, the permanent magnet is coaxially slidably connected to the limit sleeve and is fixedly connected to the reversing valve core, the first cylinder is fixedly connected to the reversing valve core and the output end is fixedly connected to the blocking sleeve, and the second cylinder is fixedly connected to the blocking sleeve and the output end is fixedly connected to the pressure relief plug.

[0013] Furthermore, the reversing assembly also includes a contact pressure top block, a contact pressure spring and a contact pressure top plate. The contact pressure top plate is fixedly arranged at one end of the central axis cavity close to the electromagnetic generator, the contact pressure top block is arranged on one side of the transfer cavity close to the contact pressure top plate, the contact pressure spring is sleeved on the outside of the reversing valve core, one end of the contact pressure spring is fixedly connected to the contact pressure top block, and the other end is fixedly connected to the contact pressure top plate.

[0014] Furthermore, the shock-absorbing mechanism also includes a sliding shaft seat, a sliding top block, a sliding spring, a plurality of shock-absorbing short rods, a plurality of shock-absorbing short shafts, a plurality of shock-absorbing springs and a plurality of shock-absorbing shaft seats. The sliding top block is fixedly arranged on a side of the first inner cavity away from the second inner cavity. The sliding shaft seat is coaxially fixedly connected to the reversing valve core, one end of the sliding spring is fixedly connected to the sliding shaft seat, and the other end is fixedly connected to the sliding top block. The plurality of shock-absorbing short rods are arranged in an array at equal angles along the circumferential direction of the sliding shaft seat, one end of the plurality of shock-absorbing short rods is hinged to the sliding shaft seat, and the plurality of shock-absorbing short shafts are respectively hinged to the other ends of the plurality of shock-absorbing short rods, the plurality of shock-absorbing shaft seats are respectively fixedly connected to the valve body and slidably connected to the plurality of shock-absorbing short shafts, the plurality of shock-absorbing springs are respectively sleeved on the outside of the plurality of shock-absorbing short shafts, one end of the plurality of shock-absorbing springs is respectively fixedly connected to the plurality of shock-absorbing shaft seats, and the other end is respectively fixedly connected to the plurality of shock-absorbing short shafts, and the lower end of the adapter curved plate is fixedly connected to the sliding shaft seat.

[0015] Furthermore, the pressure relief mechanism also includes a pressure relief baffle, a pressure relief spring, a connecting short shaft, a transfer baffle, a connecting steel ball and a plurality of liquid blocking rollers. A partition is formed in the middle of the reversing valve core. The transfer baffle is fixedly connected coaxially with the pressure relief hole, the connecting short shaft is slidingly connected coaxially with the transfer baffle, the connecting steel ball is rotatably connected to the lower end of the connecting short shaft, the pressure relief baffle is fixedly connected to the upper end of the connecting short shaft, the pressure relief spring is sleeved on the outside of the connecting short shaft, the upper end of the pressure relief spring is fixedly connected to the pressure relief baffle, and the lower end is fixedly connected to the transfer baffle. A plurality of liquid blocking rollers are evenly arranged at equal angles along the circumferential direction of the lower end of the pressure relief baffle, and a plurality of liquid blocking rollers are respectively fixedly connected to the pressure relief baffle. The transfer baffle is formed with a plurality of transfer holes at equal angles along the circumferential direction, and the liquid blocking rollers are respectively connected to the corresponding transfer holes with dynamic seals.

[0016] Furthermore, a blocking head is formed at the end of the pressure relief rod near one end of the partition, the blocking head is dynamically sealed with the inner wall of the sealing sleeve, a blocking flange is formed on the side of the blocking head away from the partition, and conical chamfers are formed on the blocking flange and the blocking head respectively, a plurality of leakage holes are formed at equal angles along the circumferential direction of the pressure relief rod on the side of the blocking flange near the blocking head in the pressure relief rod, a pressure relief chamber is formed in the middle of the pressure relief rod, the pressure relief chamber is connected with the plurality of leakage holes, and the pressure relief chamber is connected with the output end of the suction device through a conduit.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the device realizes the conversion of the oil flow direction in the valve body by setting five oil passage chambers, and the movement of the reversing valve core is controlled by an electromagnet. Compared with the connecting rod control of the traditional reversing pressure-maintaining valve, the movement of the reversing valve core under electromagnetic operation is more stable and has a faster response speed;

[0019] Second: the device realizes the vibration reduction of the reversing valve core through the vibration reduction mechanism, so as to avoid the vibration of the reversing valve core caused by the pressure change on both sides of the piston block before and after the reversing, thereby preventing the damage to the internal structure of the valve body;

[0020] Third: When the pressure inside the valve body is too high, the device quickly relieves the oil inside the valve body through the constant pressure component. During this process, the two pressure relief rods can respectively guide the oil on both sides of the partition out of the valve body through the pressure relief pipe. At this time, the pressure in different passages in the valve body is relieved accordingly, which can more accurately control the pressure relief process and avoid the problem of uneven pressure or insufficient pressure relief that may occur when the entire system is uniformly relieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment;

[0022] Figure 2 is a three-dimensional structural schematic diagram of the embodiment from another angle;

[0023] Figure 3 yes Figure 2 A magnified view of the structure at center;

[0024] Figure 4 is a half-section view of the first embodiment in a downward direction;

[0025] Figure 5 is a half-section view of the second embodiment of the flow downward;

[0026] Figure 6 yes Figure 5 A magnified view of the structure at B in the middle;

[0027] Figure 7 yes Figure 5 A magnified view of the structure at C in the middle;

[0028] Figure 8 is a half-section view of the three-dimensional structure of an embodiment;

[0029] Fig. 9 yes Figure 8 Enlarged view of the structure at point D in the middle.

[0030] The numbers in the figure are:

[0031] 1. Valve body; 2. Middle shaft cavity; 3. Oil passage cavity; 4. First inner cavity; 5. Second inner cavity; 6. Third inner cavity; 7. Fourth inner cavity; 8. Adapter cavity; 9. Adapter tube; 10. Reversing assembly; 11. Adapter curved plate; 12. Avoidance hole; 13. Limiting slide rail; 14. Reversing valve core; 15. Touch-pressure top block; 16. Touch-pressure spring; 17. Touch-pressure top plate; 18. Pressure relief hole; 19. Partition plate; 20. Piston block; 21. Electromagnet; 22. Electromagnetic generator; 23. Permanent magnet; 24. Limiting sleeve; 25. Shock-absorbing mechanism; 26. Sliding shaft seat; 27. Sliding spring; 28. Sliding top block; 29. ​​Shock-absorbing short rod; 30. Shock-absorbing short shaft; 31. Shock-absorbing spring; 32. Shock-absorbing shaft seat; 33. Constant pressure assembly; 34. Sealing sleeve; 35. First cylinder; 36. Second cylinder; 37. Pressure relief plug rod; 38. Pressure relief chamber; 39. Cone; 40. Blocking head; 41. Conical chamfer; 42. Blocking flange; 43. Leakage hole; 44. Pressure relief mechanism; 45. Pressure relief baffle; 46. Liquid blocking roller; 47. Pressure relief spring; 48. Connecting short shaft; 49. Transfer baffle; 50. Transfer hole; 51. Connecting steel ball. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] refer to Figures 1 to 9 A reversible pressure-maintaining valve comprises a valve body 1, wherein the valve body 1 is formed with a central axis cavity 2 along the axial direction (such as Figure 4 As shown in FIG. 1 ), five oil passage chambers 3 are sequentially formed along the axis direction of the middle shaft chamber 2, and further include:

[0034] The transfer tube 9 is fixedly connected to the valve body 1 and can communicate with the two oil passage chambers 3 arranged at both ends of the central shaft chamber 2;

[0035] The reversing assembly 10 includes a reversing valve core 14, two piston blocks 20 and a shock absorbing mechanism 25. The reversing valve core 14 is coaxially arranged with the middle shaft cavity 2. The two piston blocks 20 are respectively coaxially fixedly connected with the reversing valve core 14 and dynamically sealed with the middle shaft cavity 2. The shock absorbing mechanism 25 is connected with one end of the reversing valve core 14 and can dampen the axial movement of the reversing valve core 14. The reversing valve core 14 is formed with four groups of pressure relief holes 18 arranged in an array along the circumferential direction along the axial direction.

[0036] Two groups of constant pressure components 33 are respectively arranged on both sides of the reversing valve core 14, each group of constant pressure components 33 includes a blocking sleeve 34, a pressure relief plug rod 37 and a plurality of pressure relief mechanisms 44, and the blocking sleeve 34 is coaxially slidably arranged with the reversing valve core 14 (such as Fig. 9 As shown in the figure), the pressure relief rod 37 is slidably arranged coaxially with the blocking sleeve 34, and each group of pressure relief mechanisms 44 is connected to the corresponding pressure relief hole 18.

[0037] When the device is in operation, after the oil is introduced into the valve body 1, the oil is pumped into the valve body 1 as the gear pump operates. At this time, the oil inside the valve body 1 flows to the reference Figure 4 and Figure 5 During this process, the five oil passage chambers 3 can guide the oil flowing in opposite directions twice (the valve body 1 takes a two-position four-way valve as an example, and the specific flow process of the oil refers to the working principle of the two-position four-way valve).

[0038] In this process, when the reversing valve core 14 moves, in order to prevent the reversing valve core 14 from being impacted by the change in pressure on both sides of the piston block 20 during the reversing process, thereby affecting the stability of the reversing valve core 14, the shock absorbing mechanism 25 can buffer the vibration of the reversing valve core 14 in the axial direction, and prevent the reversing valve core 14 from being damaged due to excessive rigid impact. When the constant pressure assembly 33 is in operation, when the pressure inside the valve body 1 is too high, in order to quickly extract the oil inside the valve body 1, the two sets of constant pressure assemblies 33 can respectively relieve the pressure of the flow channel used each time the valve body 1 is in operation, avoiding the problem of uneven pressure or insufficient pressure relief that may occur when the entire system is uniformly relieved.

[0039] In order to supplement the specific structure of the oil passage chamber 3, the following features are also specifically provided:

[0040] The five oil passage chambers 3 are sequentially divided into the first inner chamber 4, the second inner chamber 5, the third inner chamber 6, the fourth inner chamber 7 and the transfer chamber 8 in the direction away from the damping mechanism 25. A transition chamber is formed between two adjacent oil passage chambers 3. Each piston block 20 is dynamically sealed with the corresponding transition chamber. The first inner chamber 4 can be connected with the transfer chamber 8 through the transfer tube 9. When the valve body 1 is working, when the oil inside the valve body 1 is as Figure 4 When the oil flows as shown in FIG. 1 , a portion of the oil will first flow into the valve body 1 from the third inner cavity 6, and then flow out from the second inner cavity 5, and another portion of the oil will flow into the valve body 1 from the fourth inner cavity 7, and then flow out of the valve body 1 after passing through the transfer cavity 8, the transfer tube 9 and the first inner cavity 4; when the oil inside the valve body 1 is as shown in FIG. Figure 5 As shown in the flow, a part of the oil will first flow into the valve body 1 from the third inner cavity 6, and then flow out from the fourth inner cavity 7. At this time, since the transfer cavity 8 is blocked, another part of the oil will flow into the valve body 1 from the second inner cavity 5, and then flow out of the valve body 1 through the first inner cavity 4.

[0041] The above specific process refers to the oil flow direction switching principle of the two-position four-way valve. Since it is a prior art, it is only briefly described here.

[0042] In order to block the flow channel of the transfer tube 9, the following features are also specifically provided:

[0043] The reversing assembly 10 also includes a transfer curved plate 11 and two limit slide rails 13. The two limit slide rails 13 are symmetrically arranged on both sides of the transfer tube 9 and are fixedly connected to the valve body 1. The lower end of the transfer curved plate 11 is fixedly connected to the reversing valve core 14, and the upper end is in dynamic sealing contact with the transfer tube 9. The upper part of the transfer curved plate 11 is formed with an avoidance hole 12 (such as Figure 6 As shown in the figure, the avoidance hole 12 is connected to the transfer tube 9. When the transfer chamber 8 needs to be blocked, in order to prevent part of the oil from flowing back into the first inner chamber 4, the reversing valve core 14 will drive the transfer curved plate 11 to move and make the avoidance hole 12 and the transfer tube 9 staggered. At this time, the oil in the transfer tube 9 cannot flow into the first inner chamber 4, thereby realizing the control of the flow direction of the oil.

[0044] It should be noted that in order to prevent the oil in the transfer tube 9 from leaking prematurely when the avoidance hole 12 and the flow path of the transfer tube 9 are offset during the movement of the transfer plate 11, a sealing sleeve should be provided on the outside of the transfer tube 9 to increase the diameter of the transfer tube 9 to ensure the stability of the oil pressure inside the valve body 1 when the transfer plate 11 moves.

[0045] In order to quickly respond to the movement of the reversing valve core 14, the following features are also specifically provided:

[0046] The reversing assembly 10 further includes an electromagnet 21, an electromagnetic generator 22, a permanent magnet 23 and a limit sleeve 24. The constant pressure assembly 33 further includes a first cylinder 35 and a second cylinder 36. The electromagnetic generator 22 is fixedly connected to one end of the valve body 1 away from the damping mechanism 25. The electromagnet 21 is fixedly connected to the output end of the electromagnetic generator 22. The limit sleeve 24 is arranged on the side of the electromagnet 21 away from the valve body 1 and is fixedly connected to the valve body 1. The permanent magnet 23 is coaxially slidably connected to the limit sleeve 24 and is fixedly connected to the reversing valve core 14. The first cylinder 35 is fixedly connected to the reversing valve core 14 and its output end is fixedly connected to the blocking sleeve 34. The second cylinder 36 is fixedly connected to the blocking sleeve 34 and its output end is fixedly connected to the pressure relief plug 37. When it is necessary to drive the reversing valve core 14 to perform axial displacement, the electromagnetic generator 22 is started and drives the electromagnet 21 to generate magnetic force. At this time, the permanent magnet 23 will move from one end of the limit sleeve 24 to the other end of the limit sleeve 24 under the action of the electromagnet 21. During this process, the reversing valve core 14 fixedly connected to the permanent magnet 23 will also move synchronously with the permanent magnet 23 , and the movement of the reversing valve core 14 will drive the piston block 20 fixedly connected thereto to move, thereby switching the flow direction of the oil inside the valve body 1 .

[0047] When the reversing valve core 14 moves, the first cylinder 35 connected to the reversing valve core 14 will move synchronously with the reversing valve core 14. When pressure relief is required, the first cylinder 35 will drive the blocking sleeve 34 to move along the axis of the reversing valve core 14. The movement of the blocking sleeve 34 will drive the pressure relief plug 37 to move through the second cylinder 36. When the second cylinder 36 is started, the second cylinder 36 will drive the pressure relief plug 37 to move. When the pressure relief plug 37 moves, the corresponding pressure relief mechanism 44 will be used to quickly extract the oil inside the valve body 1.

[0048] In order to limit the movement of the reversing valve core 14, the following features are also specifically provided:

[0049] The reversing assembly 10 further includes a contact pressure top block 15, a contact pressure spring 16 and a contact pressure top plate 17. The contact pressure top plate 17 is fixedly arranged at one end of the central shaft cavity 2 close to the electromagnetic generator 22, and the contact pressure top block 15 is arranged at one side of the transfer cavity 8 close to the contact pressure top plate 17 (refer to Figure 4 ), the contact pressure spring 16 is sleeved on the outside of the reversing valve core 14, one end of the contact pressure spring 16 is fixedly connected to the contact pressure top block 15, and the other end is fixedly connected to the contact pressure top plate 17. When the reversing valve core 14 moves, the contact pressure spring 16 limits the movement of the reversing valve core 14, balances the various external forces received by the reversing valve core 14 when it moves, and prolongs the service life of the device.

[0050] In order to supplement the specific structure of the shock absorbing mechanism 25, the following features are also specifically provided:

[0051] The damping mechanism 25 further includes a sliding shaft seat 26, a sliding top block 28, a sliding spring 27, a plurality of damping short rods 29, a plurality of damping short shafts 30, a plurality of damping springs 31 and a plurality of damping shaft seats 32. The sliding top block 28 is fixedly arranged on the side of the first inner cavity 4 away from the second inner cavity 5. The sliding shaft seat 26 is coaxially fixedly connected to the reversing valve core 14. One end of the sliding spring 27 is fixedly connected to the sliding shaft seat 26, and the other end is fixedly connected to the sliding top block 28. The plurality of damping short rods 29 are arranged in an equiangular array along the circumferential direction of the sliding shaft seat 26. The plurality of shock-absorbing short rods 29 are arranged in series, one end of the plurality of shock-absorbing short rods 29 is hinged to the sliding shaft seat 26, the plurality of shock-absorbing short shafts 30 are respectively hinged to the other end of the plurality of shock-absorbing short rods 29, the plurality of shock-absorbing shaft seats 32 are respectively fixedly connected to the valve body 1 and are slidably connected to the plurality of shock-absorbing short shafts 30, the plurality of shock-absorbing springs 31 are respectively sleeved on the outside of the plurality of shock-absorbing short shafts 30, one end of the plurality of shock-absorbing springs 31 is respectively fixedly connected to the plurality of shock-absorbing shaft seats 32, and the other end is respectively fixedly connected to the plurality of shock-absorbing short shafts 30, and the lower end of the transfer curved plate 11 is fixedly connected to the sliding shaft seat 26. During the movement of the reversing valve core 14, in order to prevent the reversing valve core 14 from moving due to the different pressures on both sides of the two piston blocks 20 when the oil flow direction is switched, the reversing valve core 14 will be damped by the sliding spring 27 and the plurality of shock-absorbing springs 31, so as to eliminate the excess force generated in the axial direction of the reversing valve core 14. When the reversing valve core 14 moves, the sliding shaft seat 26 drives the plurality of shock-absorbing short shafts 30 to move through the plurality of shock-absorbing short rods 29 , and at this time the corresponding plurality of shock-absorbing springs 31 are compressed, thereby achieving the limit of the reversing valve core 14 .

[0052] In order to supplement the specific structure of the pressure relief mechanism 44, the following features are also specifically provided:

[0053] The pressure relief mechanism 44 also includes a pressure relief baffle 45, a pressure relief spring 47, a connecting short shaft 48, a transfer baffle 49, a connecting steel ball 51 and a plurality of liquid blocking rollers 46. The middle part of the reversing valve core 14 is formed with a partition 19 (refer to Figure 4 ), the transfer baffle 49 is coaxially connected to the pressure relief hole 18 (reference Figure 7), the connecting short shaft 48 is slidably connected with the transfer baffle 49 coaxially, the connecting steel ball 51 is rotatably connected with the lower end of the connecting short shaft 48, the pressure relief baffle 45 is fixedly connected to the upper end of the connecting short shaft 48, the pressure relief spring 47 is sleeved on the outside of the connecting short shaft 48, the upper end of the pressure relief spring 47 is fixedly connected to the pressure relief baffle 45, and the lower end is fixedly connected to the transfer baffle 49, a plurality of liquid blocking rollers 46 are evenly arranged at equal angles along the circumferential direction of the lower end of the pressure relief baffle 45, a plurality of liquid blocking rollers 46 are respectively fixedly connected to the pressure relief baffle 45, and the transfer baffle 49 is formed with a plurality of transfer holes 50 at equal angles along the circumferential direction, and the liquid blocking rollers 46 are respectively connected to the corresponding transfer holes 50 in a dynamic seal. When pressure relief is not required, a number of liquid blocking rollers 46 are respectively inserted into the corresponding transfer holes 50. At this time, the oil inside the valve body 1 will not enter the reversing valve core 14. When pressure relief is required, as the connecting steel ball 51 is pushed up by the pressure relief plug rod 37 in the direction away from the axis of the reversing valve core 14, the connecting steel ball 51 will drive the pressure relief baffle 45 to move through the connecting short shaft 48. When the pressure relief baffle 45 moves, it will drive the number of liquid blocking rollers 46 and the corresponding number of transfer holes 50 to separate. At this time, the oil will pass through the transfer hole 50 and flow into the interior of the reversing valve core 14, thereby realizing the release of the over-pressure oil inside the valve body 1.

[0054] In order to supplement the specific structure of the pressure relief plug 37, the following features are also specifically provided:

[0055] The end of the pressure relief plug 37 near the partition 19 is formed with a blocking head 40 (refer to Figure 4 and Figure 7 ), the blocking head 40 is dynamically sealed with the inner wall of the blocking sleeve 34, a blocking flange 42 is formed on the side of the blocking head 40 away from the partition 19, and conical chamfers 41 are formed on the blocking flange 42 and the blocking head 40 respectively, and a plurality of leakage holes 43 are formed at equal angles along the circumferential direction of the pressure relief plug 37 on the side of the blocking flange 42 of the pressure relief plug 37 close to the blocking head 40, a pressure relief cavity 38 is formed in the middle of the pressure relief plug 37, the pressure relief cavity 38 is connected with the plurality of leakage holes 43, and the pressure relief cavity 38 is connected with the output end of the suction device through a conduit 39. When the pressure relief plug 37 moves by lifting the connecting steel ball 51 through the blocking head 40, a part of the oil will flow into the reversing valve core 14 from the side of the blocking head 40 away from the blocking flange 42, and the oil will be drawn away by the conduit 39 through the pressure relief chamber 38, while another part of the oil will flow into the reversing valve core 14 from the side of the blocking head 40 close to the blocking flange 42, and the oil will pass through a number of leakage holes 43 and then be drawn away by the conduit 39 through the pressure relief chamber 38. In this process, the conical chamfer 41 can ensure that the blocking head 40 and the blocking flange 42 can pass through the lower end of the connecting steel ball 51 and lift the connecting steel ball 51, and the blocking sleeve 34 can block the pressure relief hole 18 that does not need to work during the pressure relief process after lifting the connecting steel ball 51, so as to ensure the singleness and stability of the flow channel during pressure relief.

[0056] The working principle of this device is that when the device is running, after the oil is introduced into the valve body 1, as the gear pump runs, the oil is pumped into the valve body 1. At this time, the oil inside the valve body 1 flows to the reference Figure 4 and Figure 5 During this process, the five oil passage chambers 3 can guide the oil flowing in opposite directions twice (the valve body 1 takes a two-position four-way valve as an example, and the specific flow process of the oil refers to the working principle of the two-position four-way valve).

[0057] In this process, the electromagnet 21 and the permanent magnet 23 cooperate to drive the reversing valve core 14 to move rapidly. In order to prevent the reversing valve core 14 from being impacted by the pressure change on both sides of the piston block 20 during the reversing process, thereby affecting the stability of the reversing valve core 14, the contact spring 16, the sliding spring 27 and the plurality of shock-absorbing springs 31 can buffer the vibration of the reversing valve core 14 in the axial direction, and prevent the reversing valve core 14 from being damaged due to excessive rigid impact. When the internal pressure of the valve body 1 is too high, in order to quickly extract the oil inside the valve body 1, the two groups of pressure relief plug rods 37 move and make the pressure relief baffle 45 move away from the oil of the transfer baffle 49, and the corresponding pressure relief holes 18 can respectively relieve the pressure of the flow channel used each time the valve body 1 is running, avoiding the problem of uneven pressure or insufficient pressure relief that may occur when the entire system is uniformly relieved. The above embodiments only express one or several implementations of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A reversible pressure-maintaining valve, comprising a valve body (1), wherein the valve body (1) is formed with a central axis cavity (2) along the axial direction, and five oil-passing cavities (3) are sequentially formed along the axial direction of the central axis cavity (2), characterized in that: Also includes: A transfer tube (9) is fixedly connected to the valve body (1) and is capable of communicating with two oil passage chambers (3) disposed at both ends of the central shaft chamber (2); A reversing assembly (10) comprises a reversing valve core (14), two piston blocks (20) and a shock absorbing mechanism (25); the reversing valve core (14) is coaxially arranged with the central axis cavity (2); the two piston blocks (20) are respectively coaxially fixedly connected with the reversing valve core (14) and dynamically sealed with the central axis cavity (2); the shock absorbing mechanism (25) is connected to one end of the reversing valve core (14) and can absorb shock to the axial movement of the reversing valve core (14); the reversing valve core (14) is formed with four groups of a plurality of pressure relief holes (18) arranged in an array along a circumferential direction along the axial direction; Two groups of constant pressure components (33) are respectively arranged on both sides of the reversing valve core (14), each group of constant pressure components (33) comprises a blocking sleeve (34), a pressure relief plug rod (37) and a plurality of groups of pressure relief mechanisms (44), the blocking sleeve (34) and the reversing valve core (14) are slidably arranged coaxially, the pressure relief plug rod (37) and the blocking sleeve (34) are slidably arranged coaxially, and each group of pressure relief mechanisms (44) is connected to a corresponding pressure relief hole (18); The pressure relief mechanism (44) further comprises a pressure relief baffle (45), a pressure relief spring (47), a connecting short shaft (48), a transfer baffle (49), a connecting steel ball (51) and a plurality of liquid blocking rollers (46); a partition (19) is formed in the middle of the reversing valve core (14); the transfer baffle (49) is coaxially fixedly connected to the pressure relief hole (18); the connecting short shaft (48) and the transfer baffle (49) are coaxially slidably connected; the connecting steel ball (51) is rotatably connected to the lower end of the connecting short shaft (48); the pressure relief baffle (45) and the connecting short shaft (48) are The upper end of the pressure relief spring (47) is fixedly connected to the pressure relief baffle (45), the pressure relief spring (47) is sleeved on the outside of the connecting short shaft (48), the upper end of the pressure relief spring (47) is fixedly connected to the pressure relief baffle (45), and the lower end is fixedly connected to the transfer baffle (49), a plurality of liquid blocking rollers (46) are evenly arranged at equal angles along the circumferential direction of the lower end of the pressure relief baffle (45), the plurality of liquid blocking rollers (46) are respectively fixedly connected to the pressure relief baffle (45), the transfer baffle (49) is formed with a plurality of transfer holes (50) at equal angles along the circumferential direction, and the liquid blocking rollers (46) are respectively connected to the corresponding transfer holes (50) in a dynamic sealing manner.

2. A reversible pressure-maintaining valve according to claim 1, characterized in that: The five oil passage chambers (3) are, in order along a direction away from the damping mechanism (25), a first inner chamber (4), a second inner chamber (5), a third inner chamber (6), a fourth inner chamber (7) and a transfer chamber (8). A transition chamber is formed between two adjacent oil passage chambers (3). Each piston block (20) is dynamically sealedly connected to a corresponding transition chamber. The first inner chamber (4) can be connected to the transfer chamber (8) via a transfer tube (9).

3. A reversible pressure-maintaining valve according to claim 2, characterized in that: The reversing assembly (10) further comprises a transfer curved plate (11) and two limit slide rails (13). The two limit slide rails (13) are symmetrically arranged on both sides of the transfer tube (9) and are fixedly connected to the valve body (1). The lower end of the transfer curved plate (11) is fixedly connected to the reversing valve core (14), and the upper end is in dynamic sealing contact with the transfer tube (9). An avoidance hole (12) is formed on the upper part of the transfer curved plate (11), and the avoidance hole (12) is connected to the transfer tube (9).

4. A reversible pressure-maintaining valve according to claim 3, characterized in that: The reversing assembly (10) further comprises an electromagnet (21), an electromagnetic generator (22), a permanent magnet (23) and a limit sleeve (24); the constant pressure assembly (33) further comprises a first cylinder (35) and a second cylinder (36); the electromagnetic generator (22) is fixedly connected to one end of the valve body (1) away from the damping mechanism (25); the electromagnet (21) is fixedly connected to the output end of the electromagnetic generator (22); the limit sleeve (24) is arranged on a side of the electromagnet (21) away from the valve body (1) and is fixedly connected to the valve body (1); the permanent magnet (23) and the limit sleeve (24) are coaxially slidably connected and are fixedly connected to the reversing valve core (14); the first cylinder (35) is fixedly connected to the reversing valve core (14) and its output end is fixedly connected to the blocking sleeve (34); and the second cylinder (36) is fixedly connected to the blocking sleeve (34) and its output end is fixedly connected to the pressure relief plug (37).

5. A reversible pressure-maintaining valve according to claim 4, characterized in that: The reversing assembly (10) further comprises a contact pressure top block (15), a contact pressure spring (16) and a contact pressure top plate (17); the contact pressure top plate (17) is fixedly arranged at one end of the central shaft cavity (2) close to the electromagnetic generator (22); the contact pressure top block (15) is arranged at one side of the transfer cavity (8) close to the contact pressure top plate (17); the contact pressure spring (16) is sleeved on the outside of the reversing valve core (14); one end of the contact pressure spring (16) is fixedly connected to the contact pressure top block (15) and the other end is fixedly connected to the contact pressure top plate (17).

6. A reversible pressure-maintaining valve according to claim 3, characterized in that: The shock absorbing mechanism (25) further comprises a sliding shaft seat (26), a sliding top block (28), a sliding spring (27), a plurality of shock absorbing short rods (29), a plurality of shock absorbing short shafts (30), a plurality of shock absorbing springs (31) and a plurality of shock absorbing shaft seats (32); the sliding top block (28) is fixedly arranged on a side of the first inner cavity (4) away from the second inner cavity (5); the sliding shaft seat (26) is coaxially fixedly connected to the reversing valve core (14); one end of the sliding spring (27) is fixedly connected to the sliding shaft seat (26) and the other end is fixedly connected to the sliding top block (28); the plurality of shock absorbing short rods (29) are arranged along the circumferential direction of the sliding shaft seat (26) The plurality of shock absorbing short rods (29) are arranged in an equal angle array, one end of each of the shock absorbing short rods (29) is hinged to the sliding shaft seat (26), the plurality of shock absorbing short shafts (30) are respectively hinged to the other end of each of the shock absorbing short rods (29), the plurality of shock absorbing shaft seats (32) are respectively fixedly connected to the valve body (1) and are slidably connected to the plurality of shock absorbing short shafts (30), the plurality of shock absorbing springs (31) are respectively sleeved on the outside of the plurality of shock absorbing short shafts (30), one end of each of the shock absorbing springs (31) is respectively fixedly connected to the plurality of shock absorbing shaft seats (32), and the other end of each of the shock absorbing springs (31) is respectively fixedly connected to the plurality of shock absorbing short shafts (30), and the lower end of the transfer curved plate (11) is respectively fixedly connected to the sliding shaft seat (26).

7. The reversible pressure-maintaining valve according to claim 1, characterized in that: A blocking head (40) is formed at an end of the pressure relief plug rod (37) close to one end of the partition (19), and the blocking head (40) is dynamically sealed to the inner wall of the blocking sleeve (34). A blocking flange (42) is formed on the side of the blocking head (40) away from the partition (19), and conical chamfers (41) are formed on the blocking flange (42) and the blocking head (40), respectively. A plurality of leakage holes (43) are formed at equal angles along the circumferential direction of the pressure relief plug rod (37) on the side of the blocking flange (42) of the pressure relief plug rod (37) close to the blocking head (40). A pressure relief chamber (38) is formed in the middle of the pressure relief plug rod (37), and the pressure relief chamber (38) is connected to the plurality of leakage holes (43). The pressure relief chamber (38) is connected to the output end of the suction device through a conduit (39).

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