A dual-working overflow valve

Abstract

The present invention relates to the technical field of pressure control valves, and discloses a dual-working overflow valve, which includes a main valve body. An oil inlet and an oil outlet are provided on the main valve body. A main valve assembly and an overflow valve assembly are arranged in the main valve body. A passage is formed between the oil inlet and the oil outlet through the main valve assembly and the overflow valve assembly. The overflow valve assembly includes an overflow valve body arranged between the passages of the oil inlet and the oil outlet. An overflow valve damping orifice is provided on the overflow valve body. The overflow valve assembly controls the opening and closing of the overflow valve damping orifice through pressure to control the inlet pressure at the oil inlet. A shunt port is also provided on the main valve body, and a pressure reducing valve assembly is arranged on the main valve body. This dual-working overflow valve has dual working purposes and dual working scenarios. It can not only limit the low working of the inlet pressure of the valve body, but also limit the high working of the outlet pressure of the valve body, thereby forming fixed values for the inlet and outlet pressures of the valve body, greatly improving the functionality of the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure control valves, and specifically to a dual-working overflow valve. Background Technique

[0002] An overflow valve is a type of hydraulic pressure control valve that mainly functions as a constant-pressure overflow, voltage stabilization, system unloading, and safety protection in equipment. Its principle is to control the opening and closing of the valve port through the control pressure of the pressure oil, thereby controlling the inlet pressure and ensuring that the inlet pressure is a constant value. When the inlet pressure does not reach the threshold, the fluid does not flow, and the passage will only open when the inlet pressure reaches.

[0003] The existing overflow valve has a single working scenario and can only be used to control the inlet pressure of the fluid system. When the inlet pressure reaches the threshold, a passage is formed to allow the fluid to flow out through the overflow valve, which is a limitation on the minimum value of the inlet pressure. However, it has no control ability over the upper limit of the inlet pressure. When the inlet pressure is too high, there are no restrictive measures, which may lead to too high an input pressure of the equipment connected to the outlet pressure, causing damage to the equipment and other hazards. Summary of the Invention

[0004] The present invention provides a dual-working overflow valve, which has dual working purposes and dual working scenarios. It can not only limit the low inlet pressure of the valve body but also limit the high outlet pressure of the valve body, thus forming a constant value for both the inlet and outlet pressures of the valve body, greatly improving the functionality of the valve body. It solves the problem mentioned in the above background technique that the existing overflow valve has a single working scenario and can only be used to control the inlet pressure of the fluid system. When the inlet pressure reaches the threshold, a passage is formed to allow the fluid to flow out through the overflow valve, which is a limitation on the minimum value of the inlet pressure. However, it has no control ability over the upper limit of the inlet pressure. When the inlet pressure is too high, there are no restrictive measures, which may lead to too high an input pressure of the equipment connected to the outlet pressure, causing damage to the equipment and other hazards.

[0005] The present invention provides the following technical solution: A dual-working overflow valve includes a main valve body. An oil inlet and an oil outlet are provided on the main valve body. A main valve component and an overflow valve component are arranged inside the main valve body. A passage is formed between the oil inlet and the oil outlet through the main valve component and the overflow valve component;

[0006] The overflow valve component includes an overflow valve body arranged between the passages of the oil inlet and the oil outlet. An overflow valve damping orifice is provided on the overflow valve body. The overflow valve component controls the opening and closing of the overflow valve damping orifice through pressure to control the inlet pressure at the oil inlet;

[0007] A shunt port is further provided on the main valve body. A pressure reducing valve component is arranged on the main valve body. A passage is formed between the oil outlet and the shunt port through the pressure reducing valve component;

[0008] The pressure reducing valve assembly includes a pressure reducing valve body disposed between the oil outlet and the shunt port passage. A pressure reducing valve damping port is formed on the pressure reducing valve body. The pressure reducing valve assembly controls the opening and closing through pressure to control the outlet pressure at the oil outlet of the pressure reducing valve damping port.

[0009] As an alternative embodiment of the dual-working overflow valve of the present invention, wherein: a first oil chamber and a second oil chamber are formed in the main valve body. The first oil chamber is communicated with the oil inlet, and the overflow valve body is disposed in the second oil chamber;

[0010] A first communication groove, a second communication groove, and a third communication groove are further formed in the main valve body. The first oil chamber is communicated with the oil outlet through the first communication groove. The second oil chamber is communicated with the first oil chamber through the second communication groove. The second oil chamber is communicated with the oil outlet through the third communication groove.

[0011] As an alternative embodiment of the dual-working overflow valve of the present invention, wherein: the main valve assembly includes a main valve body disposed in the first oil chamber. A main valve damping port and a plurality of main valve body communication holes are formed on the main valve body. The inner cavity of the main valve body is communicated with the first oil chamber through the plurality of main valve body communication holes.

[0012] As an alternative embodiment of the dual-working overflow valve of the present invention, wherein: the main valve assembly further includes a main valve core slidably disposed in the main valve body. A main valve spring seat is disposed in the first oil chamber;

[0013] A main valve spring is sleeved on the main valve spring seat. One end of the main valve spring is connected to the main valve spring seat, and the other end of the main valve spring is connected to the main valve core. The main valve core is blocked at the main valve damping port by the elastic force of the main valve spring.

[0014] As an alternative embodiment of the dual-working overflow valve of the present invention, wherein: the overflow valve assembly further includes a plurality of overflow valve body communication holes formed on the overflow valve body. The inner cavity of the overflow valve body is communicated with the second oil chamber through the plurality of overflow valve body communication holes;

[0015] The overflow valve assembly further includes an overflow valve core slidably disposed in the overflow valve body. An overflow valve spring seat is disposed in the second oil chamber;

[0016] An overflow valve spring is sleeved on the overflow valve spring seat. One end of the overflow valve spring is connected to the overflow valve spring seat, and the other end of the overflow valve spring is connected to the overflow valve core. The overflow valve core is blocked at the overflow valve damping port by the elastic force of the overflow valve spring.

[0017] As an alternative embodiment of the dual-working overflow valve of the present invention, the following components are included: The overflow valve assembly further includes an overflow valve adjustment assembly for adjusting the preset pressure of the overflow valve spring. The overflow valve adjustment assembly includes a first threaded hole formed in the main valve body, and a first screw is threadedly connected to the first threaded hole;

[0018] A second threaded hole is formed in the first screw, and a second screw is threadedly connected to the second threaded hole. The second screw is connected to the overflow valve spring seat, and a nut is threadedly connected to the second screw. A handle is provided on the second screw.

[0019] As an alternative embodiment of the dual-working overflow valve of the present invention, the following components are included: The pressure reducing valve assembly further includes a pressure reducing valve body communication hole formed in the overflow valve body. The inner cavity of the pressure reducing valve body is communicated with the diversion port through the pressure reducing valve body communication hole;

[0020] The pressure reducing valve assembly further includes a pressure reducing valve spool slidably disposed in the pressure reducing valve body, and a pressure reducing valve spring seat is disposed in the oil outlet;

[0021] A pressure reducing valve spring is sleeved on the pressure reducing valve spring seat. One end of the pressure reducing valve spring is connected to the pressure reducing valve spring seat, and the other end of the pressure reducing valve spring is connected to the pressure reducing valve spool. The pressure reducing valve spool is blocked at the pressure reducing valve damping port by the elastic force of the pressure reducing valve spring.

[0022] As an alternative embodiment of the dual-working overflow valve of the present invention, the following components are included: The pressure reducing valve assembly further includes a pressure reducing valve adjustment assembly for adjusting the preset pressure of the pressure reducing valve spring. The structure of the pressure reducing valve adjustment assembly is the same as that of the overflow valve adjustment assembly.

[0023] As an alternative embodiment of the dual-working overflow valve of the present invention, the following components are included: A fourth communication groove is further formed in the main valve body. There are two pressure reducing valve body communication holes, and the two pressure reducing valve body communication holes are symmetrically arranged based on the pressure reducing valve body. The inner cavity of the pressure reducing valve body communication hole is communicated with the fourth communication groove through the other pressure reducing valve body communication hole. A plurality of pressure reducing valve spool communication holes are formed in the pressure reducing valve spool;

[0024] The pressure reducing valve assembly further includes a control assembly for controlling the opening and closing of the fourth communication groove.

[0025] As an alternative embodiment of the dual-working overflow valve of the present invention, the following components are included: The control assembly includes a valve plate hinged in the fourth communication groove through a first hinge shaft. A first connecting rod is hinged to the valve plate through a second hinge shaft. A second connecting rod is provided on the pressure reducing valve spool, and the first connecting rod is slidably disposed in the second connecting rod.

[0026] The present invention has the following beneficial effects:

[0027] 1. In addition to the functions of a conventional overflow valve, this dual-working overflow valve can limit the inlet pressure at the oil inlet of the main valve body, so that the pressure at the oil inlet can form a passage with the oil outlet to allow fluid to pass only when it is greater than the set pressure at the damping orifice of the overflow valve. Thus, in addition to performing the functions of constant-pressure overflow, voltage stabilization, system unloading, and safety protection, it also has the function of limiting the outlet pressure at the oil outlet. When the outlet pressure at the oil outlet is too high, it will exceed the predetermined pressure at the pressure reducing valve assembly at the oil outlet, thereby opening the passage between the oil outlet and the shunt port. Through shunt pressure reduction, the outlet pressure is stabilized by relying on the energy of the medium itself. Thus, the effects of dual-working scenarios and dual-working purposes are achieved, greatly improving the functionality of the overflow valve.

[0028] 2. For this dual-working overflow valve, the predetermined pressure at the damping orifice of the overflow valve for controlling the outlet pressure at the oil inlet and the predetermined pressure at the [specific position] for controlling the outlet pressure at the oil outlet can both be adjusted through the adjustment assembly. Specifically, by turning the handle, the spring seat installed with threads is driven to move, thereby affecting the predetermined pressure formed by the spring on the damping orifice. The operation is very simple.

[0029] 3. Considering that after the fluid input at the oil inlet ends, since the damping orifice of the overflow valve is closed again, at this time, part of the fluid remaining inside the main valve body has a reduced pressure due to the loss of driving pressure, which is not conducive to the operation of the equipment connected to the oil outlet terminal. Therefore, a control assembly is provided to inject part of the fluid remaining inside the pressure reducing valve assembly into the oil outlet through the fourth communication groove as a compensation channel, playing a certain compensation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the overall structural schematic diagram of the present invention.

[0031] Figure 2 is the overall sectional structural schematic diagram of the present invention.

[0032] Figure 3 is for the present invention Figure 2 the partial enlarged view at A in

[0033] Figure 4 is the partial sectional structural schematic diagram of the main valve body in the present invention.

[0034] Figure 5 is the partial exploded structural schematic diagram of the main valve assembly in the present invention.

[0035] Figure 6 is the partial exploded structural schematic diagram of the overflow valve assembly in the present invention.

[0036] Figure 7 This is a schematic diagram of the local explosion structure at the pressure reducing valve assembly in the present invention.

[0037] In the figure: 100, main valve body; 110, oil inlet; 120, oil outlet; 130, first oil chamber; 140, first communication groove; 150, second oil chamber; 160, second communication groove; 170, third communication groove; 180, diversion port; 190, fourth communication groove; 200, main valve assembly; 210, main valve body; 220, main valve body communication hole; 230, main valve core; 240, main valve spring seat; 250, main valve spring; 260, main valve damping orifice; 300, overflow valve assembly; 310, overflow valve body; 320, overflow valve body communication hole; 330, overflow valve core; 340, overflow valve spring seat; 350, overflow valve spring; 360, overflow valve adjustment assembly; 361, first threaded hole; 362, first screw; 363, second threaded hole; 364, second screw; 365, nut; 366, handle; 370, overflow valve damping orifice; 400, pressure reducing valve assembly; 410, pressure reducing valve body; 420, pressure reducing valve body communication hole; 430, pressure reducing valve core; 440, pressure reducing valve spring seat; 450, pressure reducing valve spring; 460, pressure reducing valve adjustment assembly; 470, pressure reducing valve core communication hole; 480, control assembly; 481, first hinge shaft; 482, valve plate; 483, second hinge shaft; 484, first connecting rod; 485, second connecting rod; 490, pressure reducing valve damping orifice. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0039] In the prior art, the overflow valve is usually only used in the fluid system scenarios that limit the inlet pressure and is only applied in a single working scenario with a single working purpose. In order to enable the overflow valve to also limit the outlet pressure and thus achieve a dual working purpose, Embodiment 1 is proposed;

[0040] Please refer to Figures 1 - 7 , a dual-working overflow valve, including a main valve body 100. An oil inlet 110 and an oil outlet 120 are opened on the main valve body 100. A main valve assembly 200 and an overflow valve assembly 300 are arranged in the main valve body 100. A passage is formed between the oil inlet 110 and the oil outlet 120 through the main valve assembly 200 and the overflow valve assembly 300;

[0041] The overflow valve assembly 300 includes an overflow valve body 310 disposed between the passages of the oil inlet 110 and the oil outlet 120. An overflow valve damping port 370 is formed on the overflow valve body 310. The overflow valve assembly 300 controls the opening and closing of the overflow valve damping port 370 through pressure to control the inlet pressure at the oil inlet 110.

[0042] A diversion port 180 is further formed on the main valve body 100. A pressure reducing valve assembly 400 is disposed on the main valve body 100. The oil outlet 120 forms a passage with the diversion port 180 through the pressure reducing valve assembly 400.

[0043] The pressure reducing valve assembly 400 includes a pressure reducing valve body 410 disposed between the passages of the oil outlet 120 and the diversion port 180. A pressure reducing valve damping port 490 is formed on the pressure reducing valve body 410. The pressure reducing valve assembly 400 controls the opening and closing of the pressure reducing valve damping port 490 through pressure to control the outlet pressure at the oil outlet 120.

[0044] A first oil chamber 130 and a second oil chamber 150 are formed inside the main valve body 100. The first oil chamber 130 is communicated with the oil inlet 110, and the overflow valve body 310 is disposed inside the second oil chamber 150.

[0045] A first communication groove 140, a second communication groove 160 and a third communication groove 170 are further formed inside the main valve body 100. The first oil chamber 130 is communicated with the oil outlet 120 through the first communication groove 140. The second oil chamber 150 is communicated with the first oil chamber 130 through the second communication groove 160. The second oil chamber 150 is communicated with the oil outlet 120 through the third communication groove 170.

[0046] In this embodiment: An oil inlet 110 and an oil outlet 120 are formed at the lower end of the main valve body 100. The oil inlet 110 is directly communicated with the first oil chamber 130 formed inside the main valve body 100. The first oil chamber 130 is communicated with the second oil chamber 150 formed above it through the second communication groove 160. The second oil chamber 150 is communicated with the oil outlet 120 through the third communication groove 170 to form a passage.

[0047] A main valve assembly 200 is vertically arranged at the first oil chamber 130, and a relief valve assembly 300 is horizontally arranged at the second oil chamber 150. Among them, the relief valve body 310 is fixed to the inner wall of the second oil chamber 150. A relief valve damping orifice 370 is provided at the right end of the relief valve body 310, and a pressure-controlled opening and closing device is arranged at the relief valve damping orifice 370. When the inlet pressure at the inlet port 110 is less than the set pressure at the relief valve damping orifice 370, the relief valve damping orifice 370 will not open, and at this time, no passage will be formed between the inlet port 110 and the outlet port 120. When the inlet pressure at the inlet port 110 is greater than the set pressure at the relief valve damping orifice 370, the relief valve damping orifice 370 opens, and the fluid can flow through the inlet port 110, the main valve assembly 200, the first oil chamber 130, the inner cavity of the relief valve body 310, the relief valve damping orifice 370, the second oil chamber 150, and the third communication groove 170 and finally flow out through the outlet port 120, thus completing the function of the relief valve. Selecting a pilot-operated relief valve to complete the relief valve function has good sealing performance. At the same time, its action is little affected by the back pressure.

[0048] A pressure reducing valve body 410 is fixedly installed on the inner wall of the outlet port 120. A pressure reducing valve damping orifice 490 is provided near the outlet port 120 of the pressure reducing valve body 410, and a pressure-controlled opening and closing device is also arranged at the pressure reducing valve damping orifice 490. When the outlet pressure at the outlet port 120 is relatively high, the hydrostatic pressure received at the pressure reducing valve damping orifice 490 exceeds the set pressure at the pressure reducing valve damping orifice 490, and the pressure reducing valve damping orifice 490 will be opened. At this time, part of the fluid flowing out of the outlet port 120 will flow out through the pressure reducing valve damping orifice 490 from the diversion port 180 provided on the main valve body 100. A pipeline for recovering the fluid can be connected to the diversion port 180, and the outlet pressure at the outlet port 120 is reduced through the diversion effect, thus completing the function of the pressure reducing valve. Embodiment 2

[0049] To realize the function of the main valve, Embodiment 2 is proposed;

[0050] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 2 - 5 , the main valve assembly 200 includes a main valve body 210 arranged in the first oil chamber 130. A main valve damping orifice 260 and a plurality of main valve body communication holes 220 are provided on the main valve body 210. The inner cavity of the main valve body 210 is communicated with the first oil chamber 130 through a plurality of main valve body communication holes 220;

[0051] The main valve assembly 200 further includes a main valve core 230 slidably arranged in the main valve body 210, and a main valve spring seat 240 is arranged in the first oil chamber 130;

[0052] A main valve spring seat 240 is sleeved with a main valve spring 250. One end of the main valve spring 250 is connected to the main valve spring seat 240, and the other end of the main valve spring 250 is connected to the main valve core 230. The main valve core 230 is blocked at the main valve damping port 260 by the elastic force of the main valve spring 250.

[0053] In this embodiment: The main valve body 210 is fixed on the inner wall of the first oil cavity 130. The bottom end of the main valve body 210 is provided with a main valve damping port 260, and a plurality of main valve body communication holes 220 are provided on the whole body. The main valve core 230 is slidably installed on the inner wall of the main valve body 210. The main valve spring seat 240 is fixed on the top wall of the first oil cavity 130. The two ends of the main valve spring 250 are respectively fixed on the main valve spring seat 240 and the main valve core 230. The main valve core 230 is pressed against the main valve damping port 260 by the elastic force provided by the main valve spring 250 to block the main valve damping port 260. At this time, the main valve body communication hole 220 that forms a connection with the oil inlet 110 and the oil outlet 120 is blocked by the main valve core 230 and cannot be connected.

[0054] At this time, the fluid entering from the oil inlet 110 will pass through the first oil cavity 130 and the second communication groove 160 and enter the second oil cavity 150, rather than entering the oil outlet 120. Embodiment 3

[0055] To achieve the function of the overflow valve, Embodiment 3 is proposed;

[0056] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 2 - 6 , the overflow valve assembly 300 further includes a plurality of overflow valve body communication holes 320 opened on the overflow valve body 310. The inner cavity of the overflow valve body 310 is communicated with the second oil cavity 150 through the plurality of overflow valve body communication holes 320;

[0057] The overflow valve assembly 300 further includes an overflow valve core 330 slidably disposed in the overflow valve body 310, and an overflow valve spring seat 340 is disposed in the second oil cavity 150;

[0058] An overflow valve spring 350 is sleeved on the overflow valve spring seat 340. One end of the overflow valve spring 350 is connected to the overflow valve spring seat 340, and the other end of the overflow valve spring 350 is connected to the overflow valve core 330. The overflow valve core 330 is blocked at the overflow valve damping port 370 by the elastic force of the overflow valve spring 350.

[0059] In this embodiment: The setting of the overflow valve assembly 300 is similar to that of the main valve assembly 200. The difference is that the fit between the main valve damping orifice 260 and the main valve spool 230 is trapezoidal, while the fit between the overflow valve damping orifice 370 and the overflow valve spool 330 is conical. The elastic force provided by the overflow valve spring 350 presses the overflow valve spool 330 against the overflow valve damping orifice 370 to block the overflow valve damping orifice 370.

[0060] When the overflow valve damping orifice 370 is closed, the pressures above and below the main valve spool 230 are equal, and it is in the lowest position of the main valve damping orifice 260 under the pressure of the main valve spring 250. When the inlet pressure at the oil inlet 110 is greater than the elastic force of the overflow valve damping orifice 370, the overflow valve spool 330 will be pushed open, allowing the fluid to enter the right side of the second oil chamber 150, and then enter the oil outlet 120 through the third communication groove 170. At this time, under the pressure-reducing effect of the overflow valve damping orifice 370, the pressure on the upper side of the main valve spool 230 decreases, and the resultant force causes it to lift. At this time, the oil inlet 110 and the oil outlet 120 will also be directly connected. Embodiment 4

[0061] According to the different application scenarios of the fluid system, the limitation on the inlet pressure will be different. At this time, it is necessary to adjust the preset pressure of the overflow valve spring 350. Therefore, Embodiment 4 is proposed;

[0062] This embodiment is an improved description based on Embodiment 3. Specifically, please refer to Figures 1 - 6 , the overflow valve assembly 300 further includes an overflow valve adjustment assembly 360 for adjusting the preset pressure of the overflow valve spring 350. The overflow valve adjustment assembly 360 includes a first threaded hole 361 opened on the main valve body 100, and a first screw 362 is threadedly connected in the first threaded hole 361;

[0063] A second threaded hole 363 is opened on the first screw 362, a second screw 364 is threadedly connected in the second threaded hole 363, and the second screw 364 is connected to the overflow valve spring seat 340. A nut 365 is threadedly connected to the second screw 364, and a handle 366 is provided on the second screw 364.

[0064] In this embodiment: The first screw 362 is fixed to the main valve body 100 by threaded connection. The second screw 364 is threadedly installed on the first screw 362, and the second screw 364 is fixed to the overflow valve spring seat 340. By turning the handle 366 to drive the second screw 364 to rotate, the overflow valve spring seat 340 can be driven to move left and right. The left and right movement of the overflow valve spring seat 340 will affect the compression degree of the overflow valve spring 350, and thus affect the preset pressure formed by the overflow valve spring 350 on the overflow valve damping orifice 370. After the movement is completed, the nut 365 can be screwed to be close to the handle 366 to fix the position and fix the preset pressure. Embodiment 5

[0065] To achieve the function of the pressure reducing valve, Embodiment 5 is proposed;

[0066] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 1 - 7 , the pressure reducing valve assembly 400 further includes a pressure reducing valve body communication hole 420 opened on the overflow valve body 310, and the inner cavity of the pressure reducing valve body 410 is communicated with the diversion port 180 through the pressure reducing valve body communication hole 420;

[0067] The pressure reducing valve assembly 400 further includes a pressure reducing valve spool 430 slidably disposed within the pressure reducing valve body 410, and a pressure reducing valve spring seat 440 is disposed within the oil outlet 120;

[0068] A pressure reducing valve spring 450 is sleeved on the pressure reducing valve spring seat 440. One end of the pressure reducing valve spring 450 is connected to the pressure reducing valve spring seat 440, and the other end of the pressure reducing valve spring 450 is connected to the pressure reducing valve spool 430. The pressure reducing valve spool 430 is blocked at the pressure reducing valve damping port 490 by the elastic force of the pressure reducing valve spring 450;

[0069] The pressure reducing valve assembly 400 further includes a pressure reducing valve adjustment assembly 460 for adjusting the preset pressure of the pressure reducing valve spring 450. The structure of the pressure reducing valve adjustment assembly 460 is the same as that of the overflow valve adjustment assembly 360.

[0070] In this embodiment: The structure of the pressure reducing valve assembly 400 is similar to that of the main valve assembly 200 and the overflow valve assembly 300. The pressure reducing valve spool 430 is pressed against the pressure reducing valve damping port 490 by the elastic force provided by the pressure reducing valve spring 450 to block the pressure reducing valve damping port 490.

[0071] When the static pressure of the fluid at the oil outlet 120 is greater than the elastic force of the pressure reducing valve spring 450, the pressure reducing valve spool 430 will be pushed open, allowing the fluid to enter the interior of the pressure reducing valve body 410 and then flow out through the diversion port 180, playing a role in diverting and reducing pressure.

[0072] Similarly, the preset pressure provided by the pressure reducing valve spring 450 can also be adjusted. Embodiment 6

[0073] When the input of fluid at the oil inlet 110 ends, the overflow valve damping port 370 and the pressure reducing valve damping port 490 will be re-closed due to the decrease in fluid pressure. At this time, the part of the fluid remaining in the right part of the second oil chamber 150 and the part of the fluid in the oil outlet 120 will have a reduced pressure due to the loss of part of the driving pressure. To further enhance the functionality of the valve body and provide a partial compensation function, Embodiment 6 is proposed;

[0074] This embodiment is an improved description based on Embodiment 5. Specifically, please refer to Figures 2 - 7, a fourth communication groove 190 is also formed in the main valve body 100. There are two communication holes 420 in the pressure reducing valve body, and the two communication holes 420 in the pressure reducing valve body are symmetrically arranged based on the pressure reducing valve body 410. The inner cavity of the communication hole 420 in the pressure reducing valve body is communicated with the fourth communication groove 190 through another communication hole 420 in the pressure reducing valve body. A plurality of communication holes 470 are formed in the pressure reducing valve core 430;

[0075] The pressure reducing valve assembly 400 further includes a control assembly 480 for controlling the opening and closing of the fourth communication groove 190;

[0076] The control assembly 480 includes a valve plate 482 hinged in the fourth communication groove 190 through a first hinge shaft 481. A first connecting rod 484 is hinged to the valve plate 482 through a second hinge shaft 483. A second connecting rod 485 is arranged on the pressure reducing valve core 430, and the first connecting rod 484 is slidably arranged in the second connecting rod 485.

[0077] In this embodiment: When fluid is input at the oil inlet 110 and a scenario where the pressure reducing valve assembly 400 needs to perform flow splitting and pressure reduction occurs, part of the fluid will be stored in the inner cavity of the communication hole 420 in the pressure reducing valve body and the inner cavity of the pressure reducing valve core 430 for expanding the storage space.

[0078] When the pressure reducing valve spring 450 causes the pressure reducing valve core 430 to rebound, it can continue to move obliquely upward for a certain distance. At this time, the second connecting rod 485 and the first connecting rod 484 connected to the pressure reducing valve core 430 will drive the valve plate 482 to open, allowing part of the fluid stored in the inner cavity of the communication hole 420 in the pressure reducing valve body and the inner cavity of the pressure reducing valve core 430 to flow into the oil outlet 120 through the fourth communication groove 190 and flow out, so as to increase the outlet pressure of the oil outlet 120 and play a certain compensation function.

[0079] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0080] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A dual-working overflow valve, comprising a main valve body, characterized in that: An oil inlet and an oil outlet are provided on the main valve body. A main valve assembly and a relief valve assembly are arranged inside the main valve body. A passage is formed between the oil inlet and the oil outlet through the main valve assembly and the relief valve assembly; The relief valve assembly includes a relief valve body arranged between the passages of the oil inlet and the oil outlet. A relief valve damping orifice is provided on the relief valve body. The relief valve assembly controls the opening and closing of the relief valve damping orifice through pressure to control the inlet pressure at the oil inlet; A diversion port is also provided on the main valve body. A pressure reducing valve assembly is arranged on the main valve body. A passage is formed between the oil outlet and the diversion port through the pressure reducing valve assembly; The pressure reducing valve assembly includes a pressure reducing valve body arranged between the passages of the oil outlet and the diversion port. A pressure reducing valve damping orifice is provided on the pressure reducing valve body. The pressure reducing valve assembly controls the opening and closing of the pressure reducing valve damping orifice through pressure to control the outlet pressure at the oil outlet; The pressure reducing valve assembly further includes a pressure reducing valve body communication hole provided on the relief valve body. The inner cavity of the pressure reducing valve body is communicated with the diversion port through the pressure reducing valve body communication hole; The pressure reducing valve assembly further includes a pressure reducing valve spool slidably arranged inside the pressure reducing valve body. A pressure reducing valve spring seat is arranged inside the oil outlet; A pressure reducing valve spring is sleeved on the pressure reducing valve spring seat. One end of the pressure reducing valve spring is connected to the pressure reducing valve spring seat, and the other end of the pressure reducing valve spring is connected to the pressure reducing valve spool. The pressure reducing valve spool is blocked at the pressure reducing valve damping orifice by the elastic force of the pressure reducing valve spring; A fourth communication groove is also provided on the main valve body. There are two pressure reducing valve body communication holes, and the two pressure reducing valve body communication holes are symmetrically arranged based on the pressure reducing valve body. The inner cavity of the pressure reducing valve body communication hole is communicated with the fourth communication groove through the other pressure reducing valve body communication hole. A number of pressure reducing valve spool communication holes are provided on the pressure reducing valve spool; The pressure reducing valve assembly further includes a control assembly for controlling the opening and closing of the fourth communication groove; The control assembly includes a valve plate hinged inside the fourth communication groove through a first hinge shaft. A first connecting rod is hinged on the valve plate through a second hinge shaft. A second connecting rod is arranged on the pressure reducing valve spool, and the first connecting rod is slidably arranged inside the second connecting rod.

2. The dual-working overflow valve according to claim 1, characterized in that: A first oil cavity and a second oil cavity are provided inside the main valve body. The first oil cavity is communicated with the oil inlet, and the relief valve body is arranged inside the second oil cavity; A first communication groove, a second communication groove and a third communication groove are also provided inside the main valve body. The first oil cavity is communicated with the oil outlet through the first communication groove. The second oil cavity is communicated with the first oil cavity through the second communication groove. The second oil cavity is communicated with the oil outlet through the third communication groove.

3. The double-working overflow valve according to claim 2, characterized in that: The main valve assembly includes a main valve body arranged inside the first oil cavity. A main valve damping orifice and a number of main valve body communication holes are provided on the main valve body. The inner cavity of the main valve body is communicated with the first oil cavity through the number of main valve body communication holes.

4. A dual-working overflow valve according to claim 3, characterized in that: The main valve assembly further includes a main valve spool slidably arranged inside the main valve body. A main valve spring seat is arranged inside the first oil cavity; A main valve spring is sleeved on the main valve spring seat. One end of the main valve spring is connected to the main valve spring seat, and the other end of the main valve spring is connected to the main valve spool. The main valve spool is blocked at the main valve damping orifice by the elastic force of the main valve spring.

5. The dual-working overflow valve according to claim 2, characterized in that: The relief valve assembly further includes a number of relief valve body communication holes provided on the relief valve body. The inner cavity of the relief valve body is communicated with the second oil cavity through the number of relief valve body communication holes; The overflow valve assembly further includes an overflow valve spool slidably disposed in the overflow valve body, and an overflow valve spring seat is provided in the second oil chamber; An overflow valve spring is sleeved on the overflow valve spring seat. One end of the overflow valve spring is connected to the overflow valve spring seat, and the other end of the overflow valve spring is connected to the overflow valve spool. The overflow valve spool is blocked at the overflow valve damping port by the elastic force of the overflow valve spring.

6. The double-working overflow valve according to claim 5, characterized in that: The overflow valve assembly further includes an overflow valve adjusting assembly for adjusting the preset pressure of the overflow valve spring. The overflow valve adjusting assembly includes a first threaded hole formed in the main valve body, and a first screw rod is threadedly connected in the first threaded hole; A second threaded hole is formed in the first screw rod, and a second screw rod is threadedly connected in the second threaded hole. The second screw rod is connected to the overflow valve spring seat, and a nut is threadedly connected to the second screw rod. A handle is provided on the second screw rod.

7. The double-working overflow valve according to claim 6, characterized in that: The pressure reducing valve assembly further includes a pressure reducing valve adjusting assembly for adjusting the preset pressure of the pressure reducing valve spring. The structure of the pressure reducing valve adjusting assembly is the same as that of the overflow valve adjusting assembly.

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