CN110260023B

CN110260023B - Pilot-operated type electromagnetic valve

Info

Publication number: CN110260023B
Application number: CN201810198307.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2018-03-12
Filing date: 2018-03-12
Publication date: 2022-03-11
Anticipated expiration: 2038-03-12
Also published as: CN110260023A

Abstract

The invention discloses a pilot-operated electromagnetic valve, which comprises a valve sleeve, a movable iron core component and a piston component, and is characterized by further comprising a sliding component, wherein the sliding component comprises a stop rod, at least part of the stop rod is arranged in an axial through groove or an axial through hole of the movable iron core component in a sliding manner, when the pilot-operated electromagnetic valve is electrified, the movable iron core and a static iron core are attracted, the piston component pushes the sliding component to axially slide towards the static iron core, and when the stop rod is abutted against the static iron core, the piston component stops axially sliding.

Description

Pilot-operated type electromagnetic valve

Technical Field

The invention belongs to the technical field of fluid control, and particularly relates to a pilot-operated electromagnetic valve.

Background

The pilot-operated solenoid valve is widely used, for example, for controlling the opening or closing of a medium with a large flow rate. The structure of the more guide type solenoid valves used in the market at present generally uses a sleeve pipe processed by a sleeve pipe material and a valve seat processed and formed by a copper material, the valve seat and the sleeve pipe are welded and combined, and a piston can be matched in an inner cavity of the valve seat in a sliding mode. Two fluid connecting pipes are welded on the valve seat, so the valve seat has larger size and the product has complicated structure and is inconvenient to process.

In order to miniaturize the overall structure of the pilot-operated solenoid valve, the background art adopts a technical scheme as shown in fig. 7, in which a valve sleeve 10 ' is of a tubular structure, a valve seat 30 is disposed at one end of the valve sleeve, a piston member 50 ' is directly in sliding fit in the valve sleeve, and in order to limit the stroke of the piston member 50 ', the valve sleeve is arranged into different inner diameter sections to form a step surface as a limiting part, so that the moving stroke of the piston is limited by the limiting part.

However, in the above-described structure, since the piston member 50' and the magnetic driving member are mounted, the sleeve needs to be flared, and since the step is provided as a restricting portion to limit the sliding of the piston, the length of the sleeve is increased, and the volume of the solenoid valve is increased. Therefore, how to further reduce the volume of the solenoid valve and realize miniaturization to reduce the cost has raised further improvement requirements for those skilled in the art.

Disclosure of Invention

The invention aims to provide a pilot-operated electromagnetic valve, which reduces the length of a sleeve and realizes the miniaturization of the electromagnetic valve.

The pilot-operated electromagnetic valve comprises a valve sleeve, wherein one end of the valve sleeve is fixedly connected with a static iron core, the other end of the valve sleeve is fixedly connected with a valve seat, and the valve seat is provided with a main valve port; a moving iron core component slidably disposed in the interior cavity of the valve housing; the movable iron core component comprises a movable iron core and a valve core body; the piston component is slidably arranged between the movable valve core body and the main valve port and is provided with a valve guide port;

the sliding component comprises a stopping rod; the stop rod is at least partially slidably arranged in the axial through groove or the axial through hole of the movable iron core; when the pilot electromagnetic valve is electrified to enable the movable iron core and the static iron core to be attracted, the piston component pushes the sliding component to axially slide towards the static iron core, and when the stop rod is abutted against the static iron core, the piston component stops axially sliding.

According to the electromagnetic valve provided by the invention, the sliding component is arranged in the valve sleeve, and the stop rod of the sliding component is at least partially slidably arranged in the axial through groove or the axial through hole of the movable iron core. The axial space of the valve sleeve cavity is fully utilized, the axial size of the valve sleeve can be reduced, the structure of the valve sleeve is simple, and the electromagnetic valve is integrally miniaturized.

Drawings

FIG. 1: the invention provides a structural schematic diagram of a pilot-operated electromagnetic valve in a valve closing state;

FIG. 2: the structure of the pilot-operated solenoid valve in fig. 1 is schematically shown in an open state;

FIG. 3: FIG. 1 is a schematic structural diagram of a movable iron core in a pilot-operated solenoid valve;

FIG. 4: FIG. 1 is a schematic view of a sliding member of a pilot type solenoid valve;

FIG. 5: the invention provides another structural schematic diagram of the movable iron core;

FIG. 6: the invention provides a schematic structural diagram of another sliding part;

FIG. 7: the prior art is a schematic structural diagram of a pilot-operated solenoid valve.

Notation and illustration in fig. 1-6:

100-a solenoid valve body;

10-valve housing, 11-lumen;

20-a stationary core;

30-a valve seat;

31-main valve port;

40-a moving iron core part;

41/41A-movable iron core, 42-valve core body;

43-axial through groove, 44-axial through hole;

50-a piston member;

51-piston body, 52-sealing body;

53-guide valve port, 54-communicating hole;

60-a sliding member;

61-connector, 62/62a abutment/stop bar;

70-lateral connecting pipe and 80-axial connecting pipe;

90-a spring;

200-electromagnetic coil.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a pilot-operated solenoid valve in a closed valve state, fig. 2 is a schematic structural diagram of a pilot-operated solenoid valve in an open valve state, fig. 3 is a schematic structural diagram of a plunger in the pilot-operated solenoid valve of fig. 1, and fig. 4 is a schematic structural diagram of a sliding component in the pilot-operated solenoid valve of fig. 1.

As shown in fig. 1, 2, 3 and 4.

In this embodiment, the pilot type solenoid valve includes a solenoid valve body 100 and a solenoid 200. The solenoid valve body 100 includes a valve housing 10, and the valve housing 10 is typically formed by stamping or machining from metal tubing. The static iron core 20 is disposed in the inner cavity 11 of the valve housing 10 and is welded and fixed with the valve housing 10. A valve seat 30 is welded and fixed to the other end of the valve housing 10. The valve seat 30 is generally formed by metal cutting, and an axial through hole is formed in the valve seat 30, and a main valve port 31 is formed in an upper portion of the through hole.

The movable iron core component 40 is slidably disposed in the inner cavity 11 of the valve housing 10, and the movable iron core component 40 includes a movable iron core 41 and a steel ball fixed at an end of the movable iron core 41, and the steel ball serves as a valve core body 42.

The piston member 50 is slidably provided between the plunger 41 and the main valve port 31, and the piston member 50 includes a piston body 51 and a seal body 52. The piston body 51 is generally cylindrical in shape and has an outer edge that engages the inner wall of the valve housing 10 to allow the piston body 51 to slide axially along the inner wall of the valve housing 10. The seal body 52 is typically made of a non-metallic material (e.g., a rubber or plastic material). One end of the seal body 52 is fitted to the main valve port 31, and opens or closes the main valve port 31. The other end of the seal body 52 is provided with a pilot valve port 53, and the seal body 52 is further provided with a communication hole 54 for communicating the main valve port 31 and the pilot valve port 53. The valve core body 42 is matched with the pilot valve port 53, and can open or close the pilot valve port 53.

In this embodiment, the movable iron core 41 is provided with two axial through grooves 43, and the axial through grooves 43 are symmetrically arranged relative to the axis of the movable iron core 41.

The sliding member 60 includes a connecting portion 61, the connecting portion 61 is substantially in a ring-shaped sheet structure, two axially extending stop rods 62 are further welded and fixed to an upper end portion of the connecting portion 61, the stop rods 62 are symmetrically arranged with respect to an axis of the plunger 41, and the stop rods 62 serve as stop portions of the sliding member 60. The connecting portion 61 and the piston body 51 are fixed by caulking (may be fixed by welding). The stop rod 62 of the catch member 60 cooperates with the axial through slot 43 so that it can slide axially inside the axial through slot 43. When the solenoid 200 of the pilot type solenoid valve is energized, the movable iron core 41 slides toward the stationary iron core 20 against the biasing force of the return spring 90 under the action of the solenoid force, so that the valve core body 42 opens the pilot valve port 53. Fluid flows from the pilot port 53 into the side connection pipe, and a pressure difference is generated between the upper and lower sides of the piston member 50, and the seal body 52 of the piston member 50 slides upward to open the main valve port 31 by the pressure difference. While the piston body 51 of the piston member 50 continues to slide the stopper rod 62 of the slide member 60 upward, the stopper rod 62 can be axially displaced with respect to the plunger 41. When the stopper rod 62 of the sliding member 60 abuts against the stationary core 20, the movement of the piston member 50 is stopped to achieve the limit.

Compared with the prior art that the limiting structure of the piston part is directly arranged on the valve sleeve (for example, the valve sleeve forms a step part as a limiting part through reducing), the technical scheme provided by the invention fully utilizes the space of the inner cavity of the valve sleeve to arrange the sliding part, so that the valve sleeve has a simple structure, can be directly processed into a pipe shape with approximately consistent diameter, and is particularly suitable for stainless steel materials with relatively low tensile deformation performance. And the axial length of the valve sleeve can be relatively reduced, so that the electromagnetic valve is miniaturized.

Fig. 5 is a schematic structural view of another movable core according to the present invention, and fig. 6 is a schematic structural view of another sliding member according to the present invention.

As shown in fig. 5 and 6. Different from the foregoing technical solutions, in this embodiment.

The movable iron core 41A is provided with two axial through holes 44 instead of the axial through groove 43, and the axial through holes 44 are circumferentially and symmetrically arranged relative to the axis of the movable iron core 41A.

The slide member 60 directly employs two independent stop rods 62A. The fixed connection 61 of the stopper member 60 is disposed between the plunger 41 and the piston body 51 in the bore 11, and the stopper rod 62A of the stopper member 60 is fitted to the axial through hole 44 so as to be axially slidable in the axial through hole 44.

The technical solution can also achieve the technical improvement purpose of the present invention, and is not described herein again.

In the above-mentioned solution, both ends of the stop rod 62A as the stopper sliding member 60 may be disposed to penetrate the axial through hole 44, or in a further technical solution, the upper end of the stop rod 62A may be disposed to penetrate the axial through hole 44, the lower end of the stop rod 62A is disposed in the through hole 44, opposite convex round rods are processed on the piston member, and the convex round rods extend into the axial through hole 44 to be matched with the stop rod 62A.

The above is only an exemplary preferred embodiment for better illustrating the technical solution of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present invention, and all such modifications and decorations should be regarded as the protection scope of the present invention.

Claims

1. A pilot operated solenoid valve comprising:

one end of the valve sleeve is fixedly connected with the static iron core, the other end of the valve sleeve is fixedly connected with the valve seat, and the valve seat is provided with a main valve port;

a moving iron core component slidably disposed in the interior cavity of the valve housing; the movable iron core component comprises a movable iron core and a valve core body;

the piston component is arranged between the movable iron core and the main valve port in a sliding mode and is provided with a valve guide port;

the sliding component is characterized by further comprising a sliding component, the sliding component comprises a stopping rod, at least part of the stopping rod is slidably arranged in an axial through groove or an axial through hole of the movable iron core, when the pilot electromagnetic valve is electrified to enable the movable iron core to be attracted with the static iron core, the piston component pushes the sliding component to axially slide towards the static iron core, and when the stopping rod is abutted to the static iron core, the piston component stops axially sliding.

2. The pilot-operated electromagnetic valve according to claim 1, wherein the stopper rod is two and is disposed symmetrically with respect to an axis of the movable core.

3. The pilot operated solenoid valve as recited in claim 1 wherein said slide member further comprises a connecting portion, said connecting portion being of generally annular sheet like configuration, said stop rod being fixedly connected to said connecting portion, said connecting portion being fixedly connected to said piston member.

4. The pilot operated solenoid valve as set forth in claim 2 wherein said check rod is fixed with said piston member.

5. The pilot operated solenoid valve according to claim 1, wherein said piston member includes a piston body and a sealing body, one end of said sealing body being capable of cooperating with said main valve port to close said solenoid valve; the valve guide port is arranged at the other end of the sealing body, and the sealing body further comprises a communicating hole for communicating the main valve port with the valve guide port.

6. The pilot operated solenoid valve of any one of claims 1 to 5 further comprising a nipple welded to said valve housing, said valve housing and said nipple being formed of stainless steel material, said valve housing being formed of a stainless steel tube of constant diameter.