CN217233957U - Pilot type two-position three-way valve - Google Patents

Abstract

The utility model discloses a two three-way valves of pilot-operated formula, including pilot valve and the main valve that sets up in the disk seat, the main valve includes valve body, main valve core, reset spring, and the pilot valve includes coil pack, armature subassembly, pilot valve core, and the armature subassembly includes with axial static armature, move the armature, pilot valve core one end with move the armature and be connected; a pilot type two-position three-way valve is connected in a system, and when a coil assembly is maintained to be powered off, the state that the port A is communicated with the port T can be realized; when the coil assembly is kept electrified, the state that the port A is communicated with the port P can be realized; when the coil assembly is powered on/off according to a set frequency, the A port, the P port and the T port can be completely disconnected, so that the pressure of a pressure control cavity connected with the A port in the system is basically kept unchanged, and the working requirement is met; the utility model discloses a two three-way valves of pilot type can realize the function of two solenoid valves among the prior art, can simplify system architecture, reduce cost.

Description

Pilot type two-position three-way valve

Technical Field

The utility model relates to a valve member technical field, concretely relates to two three-way valves of guide's formula.

Background

The control and adjustment of the pressure of the fluid in the closed cavity is a technique frequently used in the field of fluids.

In the chinese utility model patent with publication number CN106678426A and entitled "hydraulically driven gas injection valve", an oil inlet solenoid valve and an oil outlet solenoid valve are provided, the oil inlet solenoid valve is controlled to open, so that high-pressure hydraulic oil can enter the valve body cavity, the hydraulic oil pressure in the valve body cavity rises, the oil outlet solenoid valve is controlled to open, the hydraulic oil in the valve body cavity flows out of the valve body cavity and flows back to the oil tank, and the hydraulic oil pressure in the valve body cavity is reduced; the hydraulic oil in the valve body cavity generates thrust on the valve core, overcomes the spring force to push the valve core to move and open, and stops moving after the force is balanced with the return spring force, and the position sensor detects and feeds back the position of the valve core, so that the opening of the valve core is accurately controlled.

The above patent has a problem in that the hydraulic oil pressure of the valve body chamber is controlled by two solenoid valves, resulting in a complicated structure and high cost. Therefore, the simplification of the structure and the reduction of the cost are problems to be further solved by the above patent. If the functions of two electromagnetic valves in the patent can be realized by adopting one valve, the problems of complex structure and high cost can be solved to a certain extent.

In the prior art, a traditional two-position three-way valve is provided with a port P, a port A and a port T, wherein the port P is used for communicating high-pressure fluid, the port T is used for communicating low-pressure fluid, and the port A is used as a working port; the pressure of a working cavity connected with the port A in the system can not be maintained. Therefore, the problem of the above-mentioned CN106678426A patent cannot be solved by using a conventional two-position three-way valve.

Therefore, how to improve the conventional two-position three-way valve to realize the state that the port a is communicated with the port P, the state that the port a is communicated with the port T, and the state that the port a is not communicated with the port P and the port T becomes a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims to solve the technical problem that: the pilot type two-position three-way valve can realize the state that the port A is communicated with the port P and the port A is communicated with the port T, and can also realize the state that the port A is not communicated with the port P and the port T, so that the pressure of a working cavity connected with the port A in a system is kept stable, and the working requirement is met.

In order to solve the technical problem, the technical scheme of the utility model is that: the pilot type two-position three-way valve comprises a valve seat, a pilot valve arranged on one side of the valve seat and a main valve arranged on the other side of the valve seat;

the main valve comprises a valve body, a main valve core and a return spring, the valve body is fixedly connected with the valve seat, the valve body is provided with a P port, an A port and a T port which are communicated with an inner cavity of the valve body and are axially spaced, the P port is used for communicating high-pressure fluid, the T port is used for communicating low-pressure fluid, and the A port is used for communicating a pressure control cavity; the main valve core is arranged in the inner cavity of the valve body in a sliding manner and is provided with a valve core flow passage A, a valve core flow passage P, a throttling hole A and a throttling hole P; the reset spring is clamped between an end cover and the main valve core, the end cover is installed at the end part of the inner cavity of the valve body, a cavity A is formed among the end cover, the valve body and the main valve core, and the cavity A is communicated with the port A through the valve core flow passage A and the throttling hole A;

the pilot valve comprises a coil assembly, an armature assembly and a pilot valve core, wherein the coil assembly is fixedly connected with the valve seat, and a guide sleeve is arranged in the center of the coil assembly; the armature component comprises a static armature and a movable armature which are in the same axial direction, the static armature is fixedly connected with the valve seat, the static armature is provided with a static armature central through hole, the movable armature is arranged on the guide sleeve in a sliding mode and is connected with one end of the pilot valve core, the pilot valve core is arranged in the static armature central through hole in a sliding mode, the other end of the pilot valve core is provided with an end part conical surface, and the static armature central through hole is provided with a sealing structure which is matched with the end part conical surface and is used for forming a sealing conical surface; a cavity P is formed among the main valve element, the valve body, the static armature, the sealing structure and the pilot valve element, and the cavity P is communicated with the port P through the throttling hole P and the valve element flow passage P.

Wherein, chamber P is provided with pressure relief structure, pressure relief structure includes: the valve body diversion groove is arranged on the peripheral surface of the valve body, and the static armature pressure relief hole is arranged in the static armature and is communicated with the central through hole of the static armature; when the cavity P is decompressed, fluid communicates the cavity P, the central through hole of the static armature, the decompression hole of the static armature, the diversion trench of the valve body and the T port.

Wherein, two three-way valves of pilot-operated type still be provided with the armature pressure balance structure moves that T mouth communicates, move armature pressure balance structure and include: the static armature flow guide groove is formed in the peripheral surface of the static armature, the movable armature flow guide surface is formed in the peripheral surface of the movable armature, and the movable armature flow guide flow channel is formed in the movable armature.

The movable armature is arranged to be a cylinder, the peripheral surface of the cylinder is provided with a plane structure, and the plane structure is used as a flow guide surface of the movable armature; the movable armature diversion flow passage comprises a movable armature axial flow passage and a movable armature radial flow passage which are communicated.

One end of the central through hole of the static armature is arranged to be an expanding section, the sealing structure is arranged to be a sealing seat sleeve, and the sealing seat sleeve is embedded in the expanding section.

The radial sizes of the valve core flow passages P are sequentially increased along the direction from the port P to the cavity P, valve core inserts are arranged on the large-diameter sections of the valve core flow passages P, and the throttling holes P are arranged on the valve core inserts.

The guide sleeve is a non-magnetic guide sleeve, one end of the guide sleeve is closed, and the other end of the guide sleeve is open.

After the technical scheme is adopted, the beneficial effects of the utility model are as follows:

because the utility model discloses a two three-way valves of pilot-operated formula include pilot valve and the main valve that sets up in the disk seat, and the main valve includes valve body, main valve core, reset spring, and the pilot valve includes coil pack, armature subassembly, pilot-operated valve core, and the armature subassembly includes with axial quiet armature, move the armature, pilot-operated valve core one end with move the armature and be connected; the pilot type two-position three-way valve is connected in the system, and the state that the port A is communicated with the port T can be realized when the coil assembly is kept in power-off; when the coil assembly is kept electrified, the state that the port A is communicated with the port P can be realized; when the coil assembly is powered on/off according to a set frequency, the A port, the P port and the T port can be completely disconnected, so that the pressure of a pressure control cavity connected with the A port in the system is basically kept unchanged, and the working requirement is met. And, the utility model discloses a two three-way valves of pilot type can realize the function of two solenoid valves among the prior art, have simplified system architecture, the cost is reduced.

Drawings

Fig. 1 is a schematic structural view of a pilot-operated two-position three-way valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the state of the port A, the port T and the port A of the pilot-operated two-position three-way valve in FIG. 1;

FIG. 3 is a schematic diagram of the state of the port A of the pilot-operated two-position three-way valve in FIG. 1, which is communicated with the port P;

FIG. 3.1 is a schematic diagram of the pilot-operated two-position three-way valve in FIG. 3 showing the connection between the port A and the port P;

FIG. 4 is a schematic diagram of the pilot-operated two-position three-way valve of FIG. 1 showing the non-connection of port A with port P and port T;

in the figure: 1. a valve seat; 2. a main valve; 21. a valve body; 211. a valve body diversion trench; 22. a main valve element; 221. a valve core flow passage A; 222. an orifice A; 223. a spool flow passage P; 224. an orifice P; 225. a spool insert; 23. a return spring; 24. an end cap; 3. a pilot valve; 31. a coil assembly; 32. a guide sleeve; 33. a static armature; 331. a static armature pressure relief vent; 332. a static armature diversion trench; 34. sealing the seat cover; 35. a moving armature; 351. a movable armature flow guide surface; 352. a moving armature axial flow passage; 353. a movable armature radial flow passage; 36. a pilot valve spool; a. a cavity A; p, cavity P.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples.

As shown in fig. 1, the two-position three-way valve of the pilot type of the embodiment of the present invention includes a valve seat 1, a main valve 2 disposed on one side of the valve seat 1, and a pilot valve 3 disposed on the other side of the valve seat 1.

Wherein the main valve 2 comprises: valve body 21, main valve core 22, return spring 23. The valve body 21 is fixedly connected with the valve seat 1, the valve body 21 is provided with a P port, an A port and a T port which are communicated with an inner cavity of the valve body and are spaced along the axial direction, the P port is used for communicating high-pressure fluid, the T port is used for communicating low-pressure fluid (such as an oil return tank), and the A port is used for communicating a pressure control cavity. The main valve core 22 is slidably arranged in the inner cavity of the valve body, the main valve core 22 is provided with a valve core flow passage A221, a valve core flow passage P223, an orifice A222 and an orifice P224, and the valve core flow passage A221 is not communicated with the valve core flow passage P223; the optimized design is that the radial size of the valve core flow passage P223 is sequentially increased along the direction from the port P to the cavity Pp, a valve core insert 225 is arranged on the large-diameter section of the valve core flow passage P223, and a throttling hole P224 is arranged on the valve core insert 225; orifice a222 and orifice P224 reduce the flow rate of the fluid, slow the flow of the fluid, and reduce the impact of the reciprocation of main valve element 22. The return spring 23 is clamped between the end cover 24 and the left end of the main valve element 22, the end cover 24 is installed at the end part of the inner cavity of the valve body, a cavity Aa is formed among the end cover 24, the valve body 21 and the left end of the main valve element 22, and the cavity Aa is communicated with the port A of the valve body 21 through a valve element flow passage A221 and an orifice A222.

Wherein, the pilot valve 3 includes: coil assembly 31, armature assembly, pilot valve core 36. Coil pack 31 and 1 fixed connection of disk seat are provided with uide bushing 32 at coil pack 31's center to uide bushing 32 is the uide bushing of non-magnetic conduction, like materials such as no magnetism stainless steel, copper, aluminium, and uide bushing 32 one end is sealed, and the other end is uncovered. The armature component comprises a static armature 33 and a movable armature 35 which are coaxial, the static armature 33 is fixedly connected with the valve seat 1, the static armature 33 is provided with a static armature center through hole, the movable armature is slidably arranged on the guide sleeve 32 and is connected with one end of a pilot valve core 36, the pilot valve core 36 is slidably arranged on the static armature center through hole, the left end of the pilot valve core 36 is provided with an end part conical surface, the static armature center through hole is provided with a sealing structure which is matched with the end part conical surface and is used for forming a sealing conical surface, the sealing structure is optimally designed into a sealing seat sleeve 34, the left end of the static armature center through hole is optimally arranged into an expanding section, the sealing seat sleeve 34 is embedded into the expanding section, the sealing seat sleeve 34 is easy to replace after being worn, and sealing reliability can be guaranteed. A cavity Pp is formed among the right end of the main valve element 22, the valve body 21, the static armature 33, the sealing seat sleeve 34 and the left end of the pilot valve element 36, and the cavity Pp is communicated with a port P of the valve body 21 through a throttling hole P224 and a valve element flow passage P223.

Wherein, chamber Pp is provided with the pressure release structure, and the pressure release structure includes: a valve body guide groove 211 arranged on the outer peripheral surface of the valve body 21, and a static armature pressure relief hole 331 arranged in the static armature 33 and communicated with the central through hole of the static armature; when the cavity Pp is decompressed, the cavity Pp, the static armature center through hole, the static armature decompression hole 331 and the valve body guide groove 211 are communicated with the T port of the valve body 21 by fluid.

Wherein, in order to release the pressure that the armature 35 motion produced to hydraulic oil, reduce the moving resistance of moving armature 35, still be provided with the armature pressure balance structure that moves with T mouth intercommunication, this armature pressure balance structure that moves includes: the armature flow guiding device comprises a static armature flow guiding groove 332 arranged on the outer peripheral surface of the static armature 33, a moving armature flow guiding surface 351 arranged on the outer peripheral surface of the moving armature 35, and a moving armature flow guiding channel arranged in the moving armature 35, wherein the moving armature flow guiding channel comprises a moving armature axial flow channel 352 and a moving armature radial flow channel 353 which are communicated with each other; the movable armature 35 is preferably configured as a cylinder, and the outer circumference of the cylinder is configured with a planar structure, which serves as a movable armature guide surface 351.

The utility model discloses two three-way valves of pilot type's operating mechanism as follows:

setting the rated pressure of the high-pressure fluid to be P0, the target pressure of the pressure control cavity to be P1, P1 to be P0, the target pressure deviation to be delta P, the delta P is greater than 0, the size of the delta P can be determined through experiments, and the actual pressure at the opening A is P;

when control coil assembly 31 is de-energized for an extended period of time, as shown in FIG. 2, main spool 22 is at the rightmost end, with port A communicating with port T, under the force of return spring 23.

When the pressure of the fluid at the port P is 0, the coil assembly 31 is not electrified, and the pilot valve element 36 is in a free state; when coil assembly 31 is energized, pilot spool 36 moves to the left closing the sealing cone.

When the port P pressure is not equal to 0 (e.g., the rated pressure P0), port P hydraulic oil flows to the chamber Pp through the spool flow passage P223 and the orifice P224, if the coil assembly 31 is energized to close the sealing conical surface, the hydraulic oil generates a thrust force which is larger than the acting force of the return spring 23 and the hydraulic pressure of the chamber A a, and the main spool 22 moves leftward; the hydraulic oil in the chamber Aa is discharged to the port a through the spool flow passage a221 and the orifice a222, the chamber A a becomes small, the port a is disconnected from the port T, the port a communicates with the port P, and the port a pressure rises, as shown in fig. 3.

When it is determined that P rises to P1, for example, P1- Δ P1, control coil assembly 31 is de-energized to open the sealing cone, chamber Pp is depressurized, main spool 22 moves to the right, chamber Aa is enlarged, and port a pressure continues to rise until main spool 22 moves to a position where port a and port P begin to be disconnected; main spool 22 continues to move rightward to a position where port a and port P begin to be disconnected, as shown in fig. 3.1, when port a pressure is slightly higher than a set target pressure, for example, P1 +. DELTA.P 2; main spool 22 continues moving rightward, chamber Aa continues increasing, and port a pressure gradually decreases; when main spool 22 continues to move to the right to the position shown in fig. 4, port a is completely disconnected from port P and port T, and port a pressure drops to the set target pressure, P being P1. The sizes of Δ P1 and Δ P2 are determined by experiments.

When the port A, the port P and the port T are all disconnected, the coil assembly 31 is controlled to be powered on/off according to the set frequency, so that the pressure of the port A can be dynamically adjusted, the pressure of a working cavity connected with the port A in the system can be basically kept unchanged, the working cavity is always kept in the range of P1 +/-Delta P, and the working requirement is met.

The frequency or time interval of the energization/deenergization of coil assembly 31 depends mainly on the size of orifice a222 and orifice P224, the larger the orifice, the faster the flow rate, the shorter the time interval, the higher the frequency; conversely, the smaller the orifice, the slower the flow rate, the longer the time interval, and the lower the frequency; the utility model discloses in, the frequency optimal design of coil pack 31 circular telegram/outage is within the several seconds scope.

The above is an example of hydraulic control, and the embodiments of the present invention have been described in detail. Obviously, the present invention is not limited to hydraulic control, but is also applicable to pneumatic control, and is not limited herein.

The pilot-operated two-position three-way valve of the utility model can realize the state that the port A is communicated with the port P when the coil assembly is kept electrified; when the coil assembly is kept powered off, the state of the port A communicated with the port T can be realized; when the coil component is powered on/off according to a set frequency, the A port, the P port and the T port can be completely disconnected, so that the pressure of a pressure control cavity connected with the A port in the system is basically kept unchanged, and the working requirement is met. And, the utility model discloses a two three-way valves of pilot type can realize the function of two solenoid valves among the prior art, can simplify system architecture, reduce cost.

The foregoing is an example of the preferred embodiment of the present invention, and those parts not specifically mentioned are known in the art, and the scope of the present invention is defined by the appended claims, and all equivalent changes that can be made based on the teachings of the present invention are within the scope of the present invention.

Claims (7)

1. The pilot type two-position three-way valve is characterized by comprising a valve seat, a pilot valve arranged on one side of the valve seat and a main valve arranged on the other side of the valve seat;

the main valve comprises a valve body, a main valve core and a return spring, the valve body is fixedly connected with the valve seat, the valve body is provided with a port P, a port A and a port T which are communicated with an inner cavity of the valve body and are axially spaced, the port P is used for communicating high-pressure fluid, the port T is used for communicating low-pressure fluid, and the port A is used for communicating a pressure control cavity; the main valve core is arranged in the inner cavity of the valve body in a sliding manner and is provided with a valve core flow passage A, a valve core flow passage P, a throttling hole A and a throttling hole P; the reset spring is clamped between an end cover and the main valve core, the end cover is installed at the end part of the inner cavity of the valve body, a cavity A is formed among the end cover, the valve body and the main valve core, and the cavity A is communicated with the port A through the valve core flow passage A and the throttling hole A;

the pilot valve comprises a coil assembly, an armature assembly and a pilot valve core, wherein the coil assembly is fixedly connected with the valve seat, and a guide sleeve is arranged in the center of the coil assembly; the armature component comprises a static armature and a movable armature which are coaxial, the static armature is fixedly connected with the valve seat, the static armature is provided with a static armature central through hole, the movable armature is arranged on the guide sleeve in a sliding mode and is connected with one end of the pilot valve core, the pilot valve core is arranged on the static armature central through hole in a sliding mode, the other end of the pilot valve core is provided with an end part conical surface, and the static armature central through hole is provided with a sealing structure which is matched with the end part conical surface and is used for forming a sealing conical surface; a cavity P is formed among the main valve element, the valve body, the static armature, the sealing structure and the pilot valve element and is communicated with the port P through the throttling hole P and the valve element flow passage P.

2. Piloted two-position three-way valve according to claim 1, characterized in that said chamber P is provided with pressure relief means comprising: the valve body diversion groove is arranged on the peripheral surface of the valve body, and the static armature pressure relief hole is arranged in the static armature and is communicated with the central through hole of the static armature; when the cavity P is decompressed, fluid communicates the cavity P, the central through hole of the static armature, the decompression hole of the static armature, the diversion trench of the valve body and the T port.

3. The piloted two-position three-way valve of claim 2 further provided with a moving armature pressure balancing structure in communication with the T port, the moving armature pressure balancing structure comprising: the static armature diversion groove is arranged on the peripheral surface of the static armature, the movable armature diversion surface is arranged on the peripheral surface of the movable armature, and the movable armature diversion flow passage is arranged in the movable armature.

4. The pilot-operated two-position three-way valve according to claim 3, wherein the movable armature is provided as a cylinder, and the outer peripheral surface of the cylinder is provided with a planar structure which serves as a flow guide surface for the movable armature; the movable armature diversion flow passage comprises a movable armature axial flow passage and a movable armature radial flow passage which are communicated.

5. The two-position three-way valve of claim 1, wherein one end of the central through hole of the static armature is provided with an expanding section, the sealing structure is provided with a sealing seat sleeve, and the sealing seat sleeve is embedded in the expanding section.

6. The pilot-operated two-position three-way valve according to claim 1, wherein the radial dimensions of the spool flow passage P increase in sequence in the direction from the port P to the chamber P, and a spool insert is provided in a large-diameter section of the spool flow passage P, and the orifice P is provided in the spool insert.

7. The pilot-operated two-position three-way valve according to claim 1, wherein the guide sleeve is a non-magnetic guide sleeve, one end of the guide sleeve is closed, and the other end of the guide sleeve is open.

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