CN215928569U

CN215928569U - Pilot-operated type electromagnetic valve

Info

Publication number: CN215928569U
Application number: CN202122319795.0U
Authority: CN
Inventors: 刘成; 杜鑫磊
Original assignee: Shanghai Thermostat Factory Co ltd
Current assignee: Shanghai Thermostat Factory Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-03-01
Anticipated expiration: 2031-09-24

Abstract

A pilot-operated solenoid valve includes a valve body member, a control member, and a coil member. The valve body component comprises a valve body, a valve body valve port, a diaphragm assembly and the like. The valve body is formed with a valve body cavity, a valve body inlet and a valve body outlet. The valve body valve port and the diaphragm assembly are arranged in the valve body cavity. The valve port of the valve body is communicated along the up-down direction. The diaphragm assembly is positioned above the valve port of the valve body. The diaphragm assembly blocks the valve port of the valve body. The valve body cavity is divided by the diaphragm assembly and the valve body valve port into a first sub-chamber below the diaphragm assembly and communicated with the valve body inlet, a third sub-chamber below the diaphragm assembly and communicated with the valve body outlet, and a second sub-chamber above the diaphragm assembly. The utility model has the beneficial effects that: the valve has the characteristics of simple structure, low energy consumption, high maximum valve opening pressure difference, high reliability, long service life and high cost performance.

Description

Pilot-operated type electromagnetic valve

Technical Field

The utility model relates to a pilot-operated electromagnetic valve.

Background

At present, the pilot-operated solenoid valve on the market of the refrigeration industry basically improves the maximum valve opening pressure difference through the power of an electromagnetic coil. The electromagnetic valve body and the electromagnetic valve coil are continuously increased along with the increase of the requirement of the valve opening pressure difference. The solenoid valve cannot be miniaturized and lightened, and requires large power for power supply.

Due to the increasing environmental requirements, the common application of new high-pressure refrigerants (carbon dioxide, R32, R410A, etc.) in refrigeration systems has raised higher requirements on the maximum valve opening pressure difference of solenoid valves. Application in particular to small devices

Therefore, it is desired to design a solenoid valve with high valve opening pressure difference, low power consumption, small size and light weight.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the valve opening pressure difference of a pilot-operated solenoid valve in the prior art is limited and cannot meet the requirement of high valve opening pressure difference, and provides a novel pilot-operated solenoid valve which provides higher valve opening pressure on the premise of not improving the power of a coil component and increasing the diameter of a solenoid valve rod.

In order to achieve the purpose, the technical scheme of the utility model is as follows: a pilot-operated solenoid valve comprises a solenoid valve,

a valve body component having a valve body formed with a valve body chamber, a valve body inlet and a valve body outlet, a valve body valve port and a sealing component are arranged in the valve body cavity, the valve body valve port is communicated along the up-down direction, the sealing component is positioned above the valve body valve port and blocks the valve body valve port, the valve body cavity is divided into a first sub-chamber below the sealing component and communicated with the valve body inlet, a second sub-chamber above the sealing component and a third sub-chamber below the sealing component and communicated with the valve body outlet by the sealing component and the valve body valve port, the sealing component is provided with a balance hole and a pilot valve hole, the balance hole is respectively communicated with the first chamber and the second chamber, the pilot valve hole is communicated with the second sub-chamber and the third sub-chamber respectively, wherein the flow area of the balance hole is smaller than that of the pilot valve hole;

a control component located above the valve body component, the control component having a sleeve body, the sleeve body being internally and sequentially provided with a limit stop iron, an upper movable iron core and a lower movable iron core from top to bottom, the limit stop iron being fixed, the upper movable iron core and the lower movable iron core being capable of moving up and down along the sleeve body, the lower movable iron core extending downwards to the inside of the second sub-chamber, the lower movable iron core being formed with a central upper blind hole with an upward opening and a lateral through hole running through in the up-down direction, a reset spring being accommodated inside the central upper blind hole and respectively abutting against the upper movable iron core bottom surface and the central upper blind hole bottom surface, the reset spring being in a compressed state, under the action force of the reset spring, the upper movable iron core top surface abutting against the limit stop iron bottom surface, the lower movable iron core bottom surface abutting against the seal assembly top surface and blocking the guide valve hole, an initial vertical distance is reserved between the upper movable iron core and the lower movable iron core, a limiting push rod is accommodated in the side through hole, the vertical length of the limiting push rod is greater than that of the side through hole, and the vertical length of the limiting push rod is used for limiting the opening distance of the guide valve hole; and the number of the first and second groups,

a coil member surrounding the outside of the bushing body, the coil member being fixed;

if the coil component is electrified, magnetic force generated by the coil component due to electrification can enable the upper movable iron core and the lower movable iron core to move oppositely against the acting force of the return spring, the lower movable iron core leaves the guide valve hole, so that the second sub-chamber is communicated with the third sub-chamber, the internal pressure of the second sub-chamber is smaller than that of the first sub-chamber, the sealing component moves upwards and leaves the valve port of the valve body, so that the first sub-chamber is communicated with the third sub-chamber, and the pilot type electromagnetic valve is switched from a closed state to an open state.

As a preferable scheme of the pilot-operated solenoid valve, the sleeve body has a sleeve peripheral wall, a tapered portion is formed on the sleeve peripheral wall, a stop iron ring groove corresponding to the tapered portion is formed on the limit stop iron, and the tapered portion is embedded with the stop iron ring groove to fix the limit stop iron.

As a preferable aspect of the pilot type solenoid valve, the sealing member is a diaphragm member.

As a preferable aspect of the pilot type solenoid valve, the sealing assembly is a piston assembly.

As a preferable scheme of the pilot-operated electromagnetic valve, the lower movable iron core is further formed with a central lower blind hole with a downward opening, and a plugging soft pad is accommodated in the central lower blind hole and used for plugging the guide valve hole.

As a preferable aspect of the pilot type electromagnetic valve, the coil member is fixed to the valve body by a snap spring.

Compared with the prior art, the utility model has the beneficial effects that: the electromagnetic valve has the advantages of simple structure, convenience in installation and capability of effectively improving the valve opening performance of the electromagnetic valve by the optimized control component.

In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems solved by the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram (off state) according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram (open state) according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and drawings. Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a pilot operated solenoid valve is shown that can be adapted for use in a refrigeration system for high pressure refrigerants (e.g., carbon dioxide, R32, R410A, etc.).

The pilot-operated solenoid valve includes a valve member 1, a control member 2, and a coil member 3.

The valve body component 1 comprises a valve body 11, a valve body valve port 12, a diaphragm assembly 13 and the like. The valve body 11 is formed with a valve chamber, a valve inlet 111 and a valve outlet 112. The valve body port 12 and the diaphragm assembly 13 are disposed within the valve body chamber. The valve body port 12 is vertically penetrated. The diaphragm assembly 13 is positioned above the valve body port 12. The diaphragm assembly 13 blocks the valve body port 12. The valve body chamber is partitioned by the diaphragm assembly 13 and the valve body port 12 into a first sub-chamber 1101 below the diaphragm assembly 13 and communicating with the valve body inlet 111, a third sub-chamber 1103 below the diaphragm assembly 13 and communicating with the valve body outlet 112, and a second sub-chamber 1102 above the diaphragm assembly 13. Since the first chamber 1101 communicates with the valve body inlet 111, the first chamber 1101 is a high pressure chamber. Since the third sub-chamber 1103 communicates with the valve body outlet 112, the third sub-chamber 1103 is a low pressure sub-chamber. The diaphragm assembly 13 is formed with a balance hole 131 and a pilot valve hole 132. The balancing holes 131 communicate the first and

second sub-chambers

1101 and 1102, respectively. The pilot hole 132 communicates the second sub-chamber 1102 and the third sub-chamber 1103, respectively. Wherein the flow area of the balance hole 131 is smaller than the flow area of the pilot hole 132. In other embodiments, the diaphragm assembly 13 may be replaced with other types of sealing assemblies such as a piston assembly.

The control part 2 is located above the valve body part 1. The control component 2 is provided with a sleeve body 21, a limit stop 22, an upper movable iron core 23, a lower movable iron core 24, a return spring 25 and a limit push rod 26. The sleeve body 21 is internally provided with the limit stop iron 22, the upper movable iron core 23 and the lower movable iron core 24. The limiting stop iron 22, the upper movable iron core 23 and the lower movable iron core 24 are sequentially arranged from top to bottom.

The limit stop 22 is fixed. In this embodiment, the sleeve body 21 has a sleeve peripheral wall and a sleeve top wall. The sleeve peripheral wall is formed with a tapered portion. The limit stop 22 is formed with a stop ring groove corresponding to the tapered portion. The tapered portion is fitted to the stopper ring groove to fix the stopper 22.

The upper movable core 23 and the lower movable core 24 can move up and down along the sleeve body 21.

The lower plunger 24 extends downwardly into the second compartment 1102. The lower movable iron core 24 is formed with a central upper blind hole with an upward opening and lateral through holes running through in the up-down direction. The return spring 25 is accommodated in the central upper blind hole. The return spring 25 extends in the up-down direction. The top surface of the reset spring 25 is abutted against the bottom surface of the upper movable iron core 23, and the bottom surface of the reset spring 25 is abutted against the bottom surface of the central upper blind hole. The return spring 25 is in a compressed state. Under the acting force of the return spring 25, the top surface of the upper movable iron core 23 abuts against the bottom surface of the limit stop 22, the bottom surface of the lower movable iron core 24 abuts against the top surface of the diaphragm assembly 13, the lower movable iron core 24 blocks the valve hole 132 to block the second sub-chamber 1102 and the third sub-chamber 1103, and an initial vertical distance is reserved between the upper movable iron core 23 and the lower movable iron core 24. Preferably, the lower plunger 24 is also formed with a central lower blind hole that opens downwardly. The inside of the central lower blind hole is provided with a plugging soft pad 241. The blocking cushion 241 can better block the guide valve hole 132. The side through hole is internally provided with a limit push rod 26. The limit push rod 26 extends in the up-down direction. The vertical length of the limiting push rod 26 is greater than that of the side through hole. The vertical length of the limit push rod 26 is used for limiting the opening height of the guide valve hole 132. The opening height is the vertical distance between the lower plunger 24 and the pilot hole 132.

The coil component 3 surrounds the casing body 21. The coil component 3 is fixed. The coil component 3 may be fixed to the valve body 11 by a snap spring. The coil element 3 is initially not energized.

The operating principle of the pilot-operated solenoid valve is as follows:

as described above, the coil part 3 is not energized, and the upper movable core 23 and the lower movable core 24 are spaced apart by the initial vertical interval under the urging force of the return spring 25. Due to the initial vertical spacing, the stop push rod 26 is in a free state. The lower movable iron core 24 is at a low position under the action of self weight and the return spring 25, and the lower movable iron core 24 blocks the pilot valve hole 132. At this time, the balance hole 131 is configured such that the second sub-chamber 1102 is communicated with the first sub-chamber 1101 and is not communicated with the third sub-chamber 1103, that is, the internal pressure of the first sub-chamber 1101 is balanced with the internal pressure of the second sub-chamber 1102. The pressure at the valve body inlet 111 is greater than the pressure at the valve body outlet 112, so the pressure above the diaphragm assembly 13 (i.e., the internal pressure of the second sub-chamber 1102) is greater than the pressure below the diaphragm assembly 13 (i.e., the internal pressure of the third sub-chamber 1103), and the diaphragm assembly 13 blocks the valve body port 12 under the two pressures, i.e., the pilot-operated solenoid valve is in the closed state.

Referring to fig. 2, when the coil component 3 is powered on, the upper movable iron core 23 and the lower movable iron core 24 are attracted towards each other against the force of the return spring 25 by the magnetic force generated by the power-on of the coil component 3, that is, the upper movable iron core 23 moves downwards and the lower movable iron core 24 moves upwards from a low position. The pilot valve hole 132 maintains the opening height under the restriction of the stopper rod 26. Since the internal diameter of the pilot valve hole 132 is small and the opening height is also small, the maximum valve opening pressure difference of the pilot type solenoid valve can be greatly increased. When the pilot hole 132 is opened, the second sub-chamber 1102 and the third sub-chamber 1103 communicate with each other through the pilot hole 132, and since the flow area of the pilot hole 132 is larger than the flow area of the balance hole 131, the upper pressure of the diaphragm assembly 13 (i.e., the internal pressure of the second sub-chamber 1102) is closer to the internal pressure of the third sub-chamber 1103. Under the internal pressure of the first compartment 1101, the diaphragm assembly 13 moves upward to be away from the valve body port 12, so that the first compartment 1101 is communicated with the third compartment 1103, that is, the pilot-operated solenoid valve is in an open state, and refrigerant enters from the valve body inlet 111 and exits from the valve body outlet 112.

It can be seen that, in the above opening process of the pilot-operated solenoid valve, the pilot valve hole 132 is always kept at a fixed opening height, so that the stroke of the lower plunger 24 is not affected by the diaphragm assembly 13, and the lower plunger 24 can make the pilot-operated solenoid valve obtain the maximum flow under the condition of the minimum stroke. The maximum valve opening pressure difference of the pilot type electromagnetic valve is increased by reducing the stroke requirement on the lower movable iron core 24.

The above only represents embodiments of the present invention, which are described in more detail and in greater detail, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pilot-operated solenoid valve is characterized by comprising,

2. The pilot-operated solenoid valve according to claim 1, wherein the sleeve body has a sleeve peripheral wall formed with a tapered portion, the stopper is formed with a stopper ring groove corresponding to the tapered portion, and the tapered portion is fitted with the stopper ring groove to fix the stopper.

3. A pilot operated solenoid valve according to claim 1 wherein said sealing assembly is a diaphragm assembly.

4. A pilot operated solenoid valve according to claim 1 wherein said sealing assembly is a piston assembly.

5. The pilot-operated solenoid valve as claimed in claim 1, wherein said lower plunger further defines a central lower blind hole opening downwardly, said central lower blind hole containing a soft sealing pad therein, said soft sealing pad being adapted to seal said pilot valve hole.

6. The pilot operated solenoid valve of claim 1 wherein the coil member is secured to the valve body by a snap spring.