Pilot-operated type proportional pressure reducing valve

Abstract

The utility model provides a pilot-operated type proportional pressure reducing valve which comprises a pilot-operated valve part, a main valve part and a flow stabilizer part located between the pilot-operated valve part and the main valve part, and a proportional electromagnet is arranged on the front portion of the pilot-operated valve part. Compared with a common direct-acting type proportional pressure reducing valve, the direct-acting type proportional pressure reducing valve has a pilot level and can meet the requirements of high-pressure and large-flow occasions under the condition of small drift diameter; the structural design of a valve element of the main valve part is matched with a main valve main hole of a main valve body, pressure reduction through a port A and a port T can be achieved in practical application, the load pressure of an outlet is limited to an adjusting value, and the pressure protection function is achieved; the pilot valve part can adopt cone valve seats with different hole diameters to meet different maximum pressure adjustment requirements, and when the maximum pressure is adjusted, only the cone valve seats need to be replaced, so that the cost is greatly reduced, and important practical significance is achieved; a control signal can be remotely input through the proportional electromagnet, continuous and proportional pressure adjustment can be achieved, and the pressure requirements of the system under different conditions are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control valves, in particular to a pilot-operated proportional pressure reducing valve. Background Art

[0002] Hydraulic transmission is a transmission method that uses liquid as the working medium to exchange, transfer and control energy. It has become an irreplaceable and important basic technology in the process of modernization of industry, agriculture, national defense and science and technology.

[0003] Hydraulic systems are usually composed of two parts: hydraulic components (including energy components, actuators, hydraulic control components, auxiliary components) and working media. Hydraulic control components have many specifications, wide application and flexibility. Through different combinations of hydraulic valves, various types of hydraulic systems can be formed. Hydraulic valves play an important role in hydraulic systems.

[0004] In common hydraulic systems, the pressure in a branch circuit is often lower than the oil supply pressure of the main oil circuit. At this time, a pressure reducing valve is needed to achieve this requirement. Currently, the common domestic six-diameter small flow proportional pressure reducing valves are mostly two-way direct-acting pressure reducing valves, which are difficult to meet some occasions with higher requirements for pressure and other parameters. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a pilot-operated proportional pressure reducing valve with an improved structure, in particular to provide a six-diameter pilot-operated three-way proportional pressure reducing valve.

[0006] To achieve the above purpose, the solution adopted by the utility model is as follows:

[0007] The utility model provides a pilot-operated proportional pressure reducing valve, comprising a pilot valve part, a main valve part and a flow stabilizer part located between the pilot valve part and the main valve part, wherein a proportional electromagnet is arranged at the front of the pilot valve part; wherein:

[0008] The pilot valve part includes a pilot valve block and a pilot valve main hole provided in the pilot valve block, a pilot valve assembly is provided in the pilot valve main hole, an oil inlet P and an oil outlet T are provided on the pilot valve block of the pilot valve part, and the oil outlet T is communicated with the pilot valve main hole;

[0009] The main valve part includes a main valve body and a main valve main hole opened in the main valve body, the main valve main hole includes a main valve core hole, a P cavity, an A cavity, a B cavity and two communicating T cavities, and a main valve core that can move axially is arranged in the main valve core hole;

[0010] The stabilizer part includes a stabilizer mounting block and a stabilizer assembly. The stabilizer mounting block is located between the pilot valve block and the main valve body. The stabilizer mounting block is provided with a mounting hole for mounting the stabilizer assembly and a blind hole located at the front end of the main valve core of the main valve part. The blind hole is communicated with the mounting hole of the stabilizer assembly. The stabilizer assembly is provided with an inner hole. The inner hole has flow channels connected with the P cavity of the main valve part and the pilot valve main hole of the pilot valve part.

[0011] Preferably, the pilot valve assembly comprises a cone valve seat, a cone valve core, a first spring located between the cone valve seat and the cone valve core, and a second spring located between the cone valve core and the proportional solenoid.

[0012] Preferably, the cone valve seat is fixed to the front end of the pilot valve main hole of the pilot valve part by a nut, and a cone valve core spring chamber is formed at the rear end of the cone valve seat, the cone valve core, the first spring and the second spring are located in the cone valve core spring chamber, the oil outlet T of the pilot valve part is connected to the cone valve core spring chamber, and a flow channel connected to the cone valve core spring chamber is provided on the flow stabilizer assembly.

[0013] Preferably, cone valve seats with different aperture sizes are used according to different pressure levels.

[0014] Preferably, a rear end cover is provided at the rear of the main valve portion.

[0015] Preferably, a main valve core spring chamber is provided at the rear end of the main valve core of the main valve part, a third spring is provided in the main valve core spring chamber, and a rear end of the third spring abuts against the rear end cover.

[0016] Preferably, a channel is provided on the central axis of the main valve core of the main valve part, one end of the channel is closed at the position of cavity A, and the other end is open and connected to the main valve core spring cavity to connect the main valve core spring cavity with cavity A.

[0017] Preferably, a damping hole is provided at the rear end portion of the passage of the main valve core of the main valve part.

[0018] Preferably, the flow stabilizer assembly comprises a flow stabilizer sleeve, a flow stabilizer spring and a flow stabilizer valve core, and the inner hole of the flow stabilizer assembly is located on the flow stabilizer sleeve and the flow stabilizer valve core.

[0019] Beneficial Effects

[0020] The utility model provides a pilot-operated proportional pressure-reducing valve, which, compared with the common direct-acting proportional pressure-reducing valve, has a pilot stage and can meet the high-pressure and high-flow occasions under small-diameter conditions; the structural design of the valve core of the main valve part cooperates with the main valve main hole of the main valve body, and can achieve pressure reduction from port A to port T in actual applications, limit the load pressure of the outlet to the adjustment value, and has the function of pressure protection; the pilot valve part can adopt cone valve seats with different apertures to meet the needs of different maximum pressure adjustments. When adjusting the maximum pressure, only the cone valve seat needs to be replaced, which greatly reduces the cost and has important practical significance; the control signal can also be remotely input through the proportional solenoid, so as to achieve continuous and proportional pressure adjustment to meet the pressure requirements of the system under different conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is an assembly cross-sectional view of the pilot-operated proportional pressure reducing valve.

[0022] Figure 2 It is a functional symbol diagram of the pilot-operated proportional pressure reducing valve involved in the utility model.

[0023] Figure 3 The utility model is an assembly cross-sectional view of a flow stabilizer assembly of a pilot-operated proportional pressure reducing valve. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] To this end, the following solutions are proposed:

[0031] See also Figure 1-2 The utility model provides a pilot-operated proportional pressure reducing valve, and in particular provides a six-diameter pilot-operated three-way proportional pressure reducing valve. The entire valve body is installed on a standard six-diameter mounting plane by means of a screw 1, and includes a pilot valve portion 100, a main valve portion 200, and a flow stabilizer portion 300 located between the pilot valve portion 100 and the main valve portion 200. A proportional solenoid 2 is arranged at the front of the pilot valve portion 100, and a rear end cover 3 is arranged at the rear of the main valve portion 200.

[0032] Specifically, the pilot valve part 100 includes a pilot valve block 101 and a pilot valve main hole 102 opened in the pilot valve block 101, and a pilot valve assembly 110 is arranged in the pilot valve main hole 102. The pilot valve assembly 110 includes a cone valve seat 111, a cone valve core 112, a first spring 113 located between the cone valve seat 111 and the cone valve core 112, and a second spring 114 located between the cone valve core 112 and the proportional solenoid 2.

[0033] In some embodiments, in the pilot valve part 100, cone valve seats 111 with different aperture sizes can be used according to the requirements of different pressure levels, and the cone valve seat 111 is fixed to the front end of the pilot valve main hole 102 of the pilot valve part 100 through a nut 116, and a cone valve core spring chamber 115 is formed at the rear end of the cone valve seat 111, and the cone valve core 112, the first spring 113 and the second spring 114 are located in the cone valve core spring chamber 115. An inner hole is provided in the cone valve seat 111, which is connected to the cone valve core spring chamber 115.

[0034] In the pilot-operated proportional pressure reducing valve provided by the utility model, the main valve part 200 includes a main valve body 201 and a main valve main hole 202 opened in the main valve body 201, the main valve main hole 202 includes a main valve core hole 203, a main valve core 204 that can move axially is provided in the main valve core hole 203, a main valve core spring chamber 205 is provided at the rear end of the main valve core 204, a third spring 206 is provided in the main valve core spring chamber 205, and the rear end of the third spring 206 abuts against the rear end cover 3. In some embodiments, a channel 207 is provided on the central axis of the main valve core 204, one end of the channel 207 is closed at the position of cavity A, and the other end is open and communicated with the main valve core spring chamber 205, so as to connect the main valve core spring chamber 205 with cavity A. A damping hole 208 is also provided at the rear end of the channel 207 of the main valve core 204.

[0035] In the pilot proportional pressure reducing valve provided by the utility model, the stabilizer part 300 includes a stabilizer mounting block 301 and a stabilizer assembly 310. The stabilizer mounting block 301 is located between the pilot valve block 101 and the main valve body 201. A mounting hole 302 for mounting the stabilizer assembly 310 and a blind hole 303 located at the front end of the main valve core 204 of the main valve part 200 are provided on the stabilizer mounting block 301. The blind hole 303 is connected to the mounting hole 302 of the stabilizer assembly 310.

[0036] In some embodiments, the stabilizer assembly 310 has an inner hole, and the inner hole has a flow channel connected to the P cavity of the main valve part 200 and the pilot valve main hole 102 of the pilot valve part 100. Figure 3 As shown, the stabilizer assembly 310 includes a stabilizer sleeve 311 , a stabilizer spring 312 and a stabilizer valve core 313 , and the inner hole of the stabilizer assembly 310 is located on the stabilizer sleeve 311 and the stabilizer valve core 313 .

[0037] In the pilot proportional pressure reducing valve provided by the utility model, the bottom surface of the main valve body 201 of the main valve part 200 is a standard six-diameter plane, and the main valve main hole 202 thereof includes a P chamber, an A chamber, a B chamber and two interconnected T chambers, the P chamber is connected to the oil inlet P, the A chamber and the B chamber are respectively connected to the working oil port A and the working oil port B, and the main valve main hole 202 is axially symmetrical with respect to the center of the P chamber. An oil inlet P and an oil outlet T are provided on the pilot valve block 101 of the pilot valve part 100, the oil outlet T is connected to the pilot valve main hole 102, and the oil outlet T of the pilot valve part 100 is connected to the cone valve core spring chamber 115. A flow channel (not shown in the figure) is provided on the flow stabilizer assembly 310, which is respectively connected to the P chamber of the main valve part 200 and the inner hole of the cone valve core 111 of the pilot valve part 100 and the cone valve core spring chamber 115. When the pressure of the P cavity of the main valve part 200 is greater than the set pressure, the pilot oil enters from the P cavity of the main valve part 200, and then flows from the flow channel to the pilot valve part 100 after the stabilizing effect of the flow stabilizer assembly 310, and then flows through the inner hole of the cone valve seat 111 in the pilot valve part 100, flows through the cone valve core spring cavity 115, and then flows to the oil outlet T of the pilot valve part 100 back to the oil tank. Among them, one end of the inner hole of the flow stabilizer valve core 313 of the flow stabilizer assembly 310 is very small, forming a damping hole, which can limit the flow and pressure of the pilot oil.

[0038] During the use of the pilot-operated proportional pressure reducing valve provided by the utility model, when no power is supplied, the main valve core 204 of the main valve part 200 does not move, and the working oil port A is connected to the T chamber, which can prevent the pressure rebound impact on the load end. At this time, the P chamber is blocked on both sides, which can avoid the instantaneous pressure impact caused by inertial load or elastic load, etc., and play a safety protection role.

[0039] When the proportional solenoid 2 is energized but the pressure has not reached the set value, under the action of electromagnetic force, by inputting different control signals, the magnetic core push rod generates different thrusts, and acts on the cone valve core 112 through the second spring 114, so that different control pressures can be established in the pilot valve part 100. When the oil starts to flow into the P chamber of the main valve part 200, the pilot control oil flows to the stabilizer assembly 310 through the flow channel of the pilot valve part 100. Through the inner hole of the stabilizer valve core 313, the pilot control oil flows to the blind hole 303 (i.e., the left end of the main valve core 204) of the stabilizer mounting block 301 and the inner hole of the cone valve seat 111, respectively, pushing the main valve core 204 to move to the right and applying a force to the cone valve core 112. At this time, the P chamber and the A chamber of the main valve part 200 are slowly opened and connected, forming a pressure reducing valve port from P to A. Because the inner hole channel 207 of the main valve core 204 connects the A chamber and the main valve core spring chamber 205 at the right end of the main valve core 204, when the pressure is balanced, the pressures at the left and right ends of the main valve core 204 are equal. With the help of the flow channel of the flow stabilizer mounting block 301, the pressure of the A chamber of the main valve part 200 is equal to the pressure in the cone valve seat 111 in the pilot valve part 100, that is, the pressure given to the cone valve core 112 of the pilot valve part 100 is equal to the pressure of the A chamber of the main valve part 200. As the pressure increases, when the pressure of the A chamber of the main valve part 200 is greater than the pressure set by the proportional solenoid 2, the cone valve core 112 of the pilot valve part 100 is pushed open, and the excess hydraulic oil flows from the cone valve core spring chamber 115 of the cone valve core 112 to the oil outlet T of the pilot valve part 100 back to the oil tank. In a very short period of time, the pressure drops due to the pilot oil returning to the tank. At this moment, the pressure in the main valve core spring chamber 205 at the right end of the main valve core 204 of the main valve part 200 is higher than the left end of the main valve core 204 because the inner hole channel 207 of the main valve core 204 has a damping hole 208. A pressure difference is formed at both ends of the damping hole 208. Therefore, the main valve core 204 moves to the left, reducing the pressure between the P port and the A port, and keeping the pressure of the oil outlet T of the main valve part 200 at a stable value.

[0040] When the proportional solenoid 2 is energized and a high-voltage fault occurs suddenly on the load or under special working conditions such as inertial load and elastic load, the instantaneous pressure will push the main valve core 204 directly to the right, thereby opening the A chamber and the T chamber, returning the excess pressure and oil to the oil tank to ensure the safety of equipment and personnel.

[0041] The utility model provides a pilot-operated proportional pressure-reducing valve, which is a six-diameter pilot-operated three-way proportional pressure-reducing valve, which can realize the function of proportional and continuous output pressure. A pilot stage is provided in the structure, and the stiffness of the second spring 114 of the pilot valve part 100 is smaller than the stiffness of the third spring 206 of the main valve part 200. In this way, when the flow rate changes, the pressure fluctuation is reduced, making the pilot-operated proportional pressure-reducing valve of the utility model more suitable for high-pressure occasions.

[0042] The utility model provides a pilot-operated proportional pressure-reducing valve, which, compared with the common direct-acting proportional pressure-reducing valve, has a pilot stage and can meet the high-pressure and high-flow occasions under small-diameter conditions; the structural design of the valve core of the main valve part cooperates with the main valve main hole of the main valve body, and can achieve pressure reduction from port A to port T in actual applications, limit the load pressure of the outlet to the adjustment value, and has the function of pressure protection; the pilot valve part can adopt cone valve seats with different apertures to meet the needs of different maximum pressure adjustments. When adjusting the maximum pressure, only the cone valve seat needs to be replaced, which greatly reduces the cost and has important practical significance; the control signal can also be remotely input through the proportional solenoid, so as to achieve continuous and proportional pressure adjustment to meet the pressure requirements of the system under different conditions.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A pilot-operated proportional pressure reducing valve, characterized in that: It comprises a pilot valve part, a main valve part and a flow stabilizer part located between the pilot valve part and the main valve part, and a proportional solenoid is arranged at the front of the pilot valve part; wherein: The pilot valve part includes a pilot valve block and a pilot valve main hole provided in the pilot valve block, a pilot valve assembly is provided in the pilot valve main hole, an oil inlet P and an oil outlet T are provided on the pilot valve block of the pilot valve part, and the oil outlet T is communicated with the pilot valve main hole; The main valve part includes a main valve body and a main valve main hole opened in the main valve body, the main valve main hole includes a main valve core hole, a P cavity, an A cavity, a B cavity and two communicating T cavities, and a main valve core that can move axially is arranged in the main valve core hole; The stabilizer part includes a stabilizer mounting block and a stabilizer assembly. The stabilizer mounting block is located between the pilot valve block and the main valve body. The stabilizer mounting block is provided with a mounting hole for mounting the stabilizer assembly and a blind hole located at the front end of the main valve core of the main valve part. The blind hole is communicated with the mounting hole of the stabilizer assembly. The stabilizer assembly is provided with an inner hole. The inner hole has flow channels connected with the P cavity of the main valve part and the pilot valve main hole of the pilot valve part.

2. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that: The pilot valve assembly comprises a cone valve seat, a cone valve core, a first spring located between the cone valve seat and the cone valve core, and a second spring located between the cone valve core and a proportional solenoid.

3. The pilot-operated proportional pressure reducing valve according to claim 2, characterized in that: The cone valve seat is fixed to the front end of the pilot valve main hole of the pilot valve part by a nut, and a cone valve core spring cavity is formed at the rear end of the cone valve seat. The cone valve core, the first spring and the second spring are located in the cone valve core spring cavity. The oil outlet T of the pilot valve part is connected to the cone valve core spring cavity, and a flow channel connected to the cone valve core spring cavity is provided on the flow stabilizer assembly.

4. The pilot-operated proportional pressure reducing valve according to claim 2, characterized in that: Cone valve seats with different aperture sizes are used according to different pressure levels.

5. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that: A rear end cover is provided at the rear of the main valve portion.

6. The pilot-operated proportional pressure reducing valve according to claim 5, characterized in that: A main valve core spring chamber is provided at the rear end of the main valve core of the main valve part, a third spring is provided in the main valve core spring chamber, and a rear end of the third spring abuts against the rear end cover.

7. The pilot-operated proportional pressure reducing valve according to claim 6, characterized in that: A channel is provided on the central axis of the main valve core of the main valve part, one end of the channel is closed at the position of cavity A, and the other end is open and communicated with the main valve core spring cavity, so as to connect the main valve core spring cavity with cavity A.

8. The pilot-operated proportional pressure reducing valve according to claim 7, characterized in that: A damping hole is arranged at the rear end portion of the passage of the main valve core of the main valve part.

9. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that: The flow stabilizer assembly comprises a flow stabilizer sleeve, a flow stabilizer spring and a flow stabilizer valve core. The inner hole of the flow stabilizer assembly is located on the flow stabilizer sleeve and the flow stabilizer valve core.

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