CN110735928B

CN110735928B - Pilot-operated type electromagnetic valve

Info

Publication number: CN110735928B
Application number: CN201810789366.XA
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: 2018-07-18
Filing date: 2018-07-18
Publication date: 2022-02-18
Anticipated expiration: 2038-07-18
Also published as: CN110735928A

Abstract

The invention discloses a pilot-operated solenoid valve, which comprises a pilot valve part, a main valve part and a piston part, and is characterized by also comprising a pilot valve seat, wherein the pilot valve seat is arranged in an accommodating cavity of the piston part, at least part of a pilot valve port is arranged on the pilot valve seat, the pilot valve port can be communicated with a second flow path port through a flow passage hole of the piston part, a set gap is formed between the radial outer edge surface of the pilot valve seat and the radial inner edge surface of the piston part facing the accommodating cavity, and the pilot valve seat is radially displaced.

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 product is widely used, and is generally used for controlling the opening or closing of a medium with a large flow rate, and fig. 1 is a pilot-operated solenoid valve used in the background art.

As shown in fig. 1, the pilot-operated solenoid valve includes a main valve part 6 and a pilot valve part 1. When the solenoid (not shown) outside the sleeve 2 of the pilot valve member 1 is de-energized, the inlet end 7 of the solenoid is a region of high pressure medium which passes through the balance hole 5-1 of the piston member 5 to the upper chamber of the piston member 5. Because the sum of the fluid pressure borne by the upper part of the piston part 5 and the pressure exerted by the spring 1-1 is larger than the fluid pressure borne by the lower part of the piston part 5, the piston part 5 keeps the contact with the main valve port, namely the main valve port is closed, and the flow path of the inlet end 7 and the outlet end 8 of the electromagnetic valve is disconnected; when the coil is energized, the moving core 102 of the pilot valve part 1 moves in reverse direction to the static core 1-3 under the action of electromagnetic force to open the pilot valve port, so that the high-pressure medium above the piston part 5 flows to the outlet end 8 through the pilot valve port. At this time, the sum of the fluid pressure borne by the upper part of the piston part 5 and the pressure exerted by the spring 1-1 is smaller than the fluid pressure borne by the lower part of the piston part 5, and under the action of the pressure difference, the piston part 5 moves upwards to open the main valve port, and the flow paths of the inlet end 7 and the outlet end 8 are opened.

In the pilot-operated solenoid valve having the above-described structure, the relief passage of the pilot valve is formed by the flow passage 9 and the flow passage 3 and is provided in the side wall portion (axially disposed) and the end cap portion 4 (radially disposed) of the main valve member 6, respectively, so that the overall size of the pilot-operated solenoid valve is increased and the structure thereof is complicated.

Therefore, the design of the pilot-operated solenoid valve is continuously improved and optimized, which is a problem to be continuously solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a pilot type electromagnetic valve with a simple structure.

The pilot type electromagnetic valve comprises a pilot valve part, a main valve part and a piston part, wherein the pilot valve part comprises an installation base, a pilot valve sleeve fixedly connected with the installation base, a static iron core fixedly connected with the pilot valve sleeve, a pilot valve core arranged in a pilot valve cavity of the electromagnetic valve and a movable iron core, and the pilot valve core can slide in the pilot valve cavity to be abutted against or far away from the pilot valve opening of the electromagnetic valve; the main valve member includes a first flow path port communicating with a main valve chamber of the solenoid valve and a second flow path port communicable with the main valve chamber through a main valve port of the solenoid valve, the piston member being slidable in the main valve chamber to abut against or away from the main valve port; the piston component is characterized by further comprising a pilot valve seat, wherein at least part of the pilot valve seat is arranged in the accommodating cavity of the piston component, the pilot valve port is arranged on the pilot valve seat and can be communicated with the second flow path port through the flow passage hole of the piston component, and a set gap is formed between the radial outer edge surface of the pilot valve seat and the radial inner edge surface, facing the accommodating cavity, of the piston component.

According to the pilot electromagnetic valve provided by the invention, the accommodating cavity is formed in the piston component, the guide valve seat is at least partially arranged in the accommodating cavity and can radially displace, and the guide valve port can be communicated with the port of the second flow path through the flow passage hole of the piston component, so that the pilot electromagnetic valve is simple in structure.

Drawings

FIG. 1: the structure schematic diagram of a pilot-operated electromagnetic valve when the valve is closed is given in the background art;

FIG. 2: the invention provides a structural schematic diagram of a pilot-operated electromagnetic valve when the valve is closed;

FIG. 3: FIG. 2 is a schematic structural diagram of a pilot-operated solenoid valve when the valve is opened;

FIG. 4: FIG. 2 is an enlarged schematic view of a pilot operated solenoid valve in a partial region Q;

FIG. 5: the invention provides a schematic diagram of a piston sleeve with a specific structure;

FIG. 6: fig. 4 is an enlarged schematic view of the pilot type solenoid valve in a partial region S.

Notation and illustration in fig. 2-6:

100-a pilot valve member;

110-a resilient element;

120-stationary core;

130-a movable iron core;

140-a pilot valve core;

150-a guide valve sleeve;

160-a mounting base;

161-a base part;

162-a cylindrical portion;

163-center hole;

164-inner circular surface;

170-a valve guide cavity;

180-a pilot valve seat;

181-a pilot valve port;

182-a tapered bottom hole;

183-radial outer edge face;

200-a main valve component;

210-a main valve body;

220-first flow path port;

230-second flow path port;

240-first take over;

250-a second adapter;

260-main valve port;

270-inner/main valve chamber;

300 a piston member;

310-a piston body;

311-a sealing member;

312 — balance holes;

313-an upper end;

314-outer circular surface;

315-center hole;

320-a piston sleeve;

321-an outer edge projection;

322-an upper barrel portion;

323-lower cylinder part;

324-a receiving cavity;

325-tapered protrusions;

326-flow channel holes;

327-a notch portion;

328-radial holes;

329-arc portion;

3210-radially inner edge surface;

3211-outer circular surface;

330-main valve sealing plug.

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. It should be noted that the upper and lower terms used herein are defined by the positions of the components shown in the drawings, and are only used for clarity and convenience of technical solution, and it should be understood that the terms used herein should not limit the scope of the claims.

Fig. 2 and fig. 3 are schematic structural diagrams of a pilot-operated solenoid valve according to the present invention when the valve is closed and opened, respectively.

As shown in fig. 1 and 2. In this embodiment, the pilot-operated solenoid valve includes three parts, a pilot valve part 100, a main valve part 200, and a piston part 300.

The pilot valve member 100 basically includes a mounting base 160, a pilot valve housing 150, a plunger 130, a plunger 120, etc. The lower end of the guide valve sleeve 150 extends into the central bore 163 of the mounting base 160 and is welded to the mounting base 160. The stationary core 120 is welded and fixed to an upper end portion of the guide valve housing 150. The plunger 130 is disposed within the guide valve housing 150 and is axially slidable. The guide valve core 140 is disposed in the inner hole of the plunger 130, and the spring (i.e., the elastic member 110) is disposed in the guide valve housing 150. One end of the spring 110 elastically abuts against the stationary core 120, and the other end of the spring 110 elastically abuts against the upper end of the guide valve body 140.

The main valve member 200 includes a main valve body 210 having a substantially columnar shape in a vertical direction, and the main valve body 210 is opened with a first passage port 220 and a second passage port 230. The first adapter 240 is welded and fixed to the first flow path port 220, and the second adapter 250 is welded and fixed to the second flow path port 250. The main valve body 210 is generally made of metal material, and the main valve body 210 is provided with an inner cavity as a main valve cavity 270. A main valve port 260 is formed at the bottom of the main valve chamber 270, the second flow path port 250 can communicate with the main valve chamber 270 through the main valve port 260, and the first flow path port 220 communicates with the inner chamber 270.

The mounting base 160 of the pilot valve member 100 includes a base portion 161 and a cylindrical portion 162, and a center hole 163 is formed in the base portion 161. The cylindrical portion 162 is formed with external threads, and the inner wall of the main valve body 210 is formed with internal threads, and the mounting base 160 is screwed and fixed to the main valve body 210.

Fig. 4 is an enlarged schematic view of the pilot-operated solenoid valve of fig. 2 in a partial region Q.

As shown in fig. 4 and with reference to fig. 2. In this embodiment, the piston assembly 300 is a two-piece structure including a piston body 310 and a piston sleeve 320, wherein the piston sleeve 320 is disposed in the central hole 315 of the piston body 310. The piston body 310 has a substantially disc-shaped configuration with a main valve sealing plug 330 provided at a lower end thereof. The outer circumferential surface 314 of the piston body 310 engages the inner circumferential surface 164 of the barrel 162 to allow the piston member 300 to slide within the main valve chamber 270, with the main valve sealing plug 330 in abutment with or away from the main valve port 260.

The piston body 310 further includes a sealing member 311, and the sealing member 311 seals the outer circumferential surface 314 of the piston body 310 and the inner circumferential surface 164 of the cylindrical portion, isolating the upper end of the piston body 310 from the lower end of the main valve chamber 270.

Of course, the piston body 310 and the piston sleeve 320 may be integrally formed.

Fig. 5 is a schematic view of a piston sleeve of one particular construction according to the present invention.

As shown in fig. 5 and with reference to fig. 4. In this particular embodiment, the piston sleeve 320 is generally a cylindrical structure with an external step. The middle portion extending toward the outer edge serves as an outer edge projection 321. The outer edge projection 321 is substantially of an end plate type and abuts the upper end 313 of the piston body 320. The cylindrical portion of the piston sleeve 320 at the upper end of the outer edge protrusion 321 serves as an upper cylindrical portion 322, and the cylindrical portion of the piston sleeve 320 at the lower end of the outer edge protrusion 321 serves as a lower cylindrical portion 323.

The upper cylinder 322 includes an arc 329 and a notch 327 formed by machining, the arc 329 partially extends into the inner hole of the guide valve sleeve 150, and an outer circular surface 3211 of the arc 329 is fitted to the inner circular surface 151 of the guide valve sleeve 150, so that the upper cylinder 150 can slide in the axial direction of the guide valve sleeve 150.

The inner hole of the upper cylinder portion 322 serves as the accommodation chamber 324, and the notch portion 327 is provided with a radial hole 328, and the radial hole 328 communicates with the accommodation chamber 324. A flow passage hole 326 is formed in the bottom of the housing chamber 324, the flow passage hole 326 communicates with the second flow passage port 230, and a tapered protrusion 325 is provided in the upper cylinder 322 at a position where the flow passage hole 326 and the housing chamber 324 are connected.

A pilot valve seat 180 made of a compressible material is disposed in the receiving cavity 324. A predetermined gap is formed between the radially outer edge surface 183 of the pilot valve seat 180 and the radially inner edge surface 3210 of the upper cylindrical portion 322 of the piston sleeve 320 facing the accommodating chamber 324, so that the pilot valve seat 325 can be fitted in the accommodating chamber 324 and can be radially displaced.

In the present embodiment, the pilot valve seat 180 has a substantially circular structure, and the "radial outer edge surface" thereof is the outer circular surface of the cylinder. Of course, the pilot valve seat may also be a non-circular structure, and its "radial outer edge surface" is defined as the outer side surface radially away from the axis; in the present embodiment, the receiving cavity 324 is a substantially circular hole structure, and the "radially inner edge surface" is the outer circular surface of the circular hole.

The clearance between the radially outer and radially inner edge surfaces is required to allow radial displacement of the pilot valve seat, so that size control is generally considered to be well over the size selected for clearance fit. Preferably between 1mm and 3 mm.

The upper end of the pilot valve seat 180 is provided with a pilot valve port 181 and the pilot valve spool 140 can slide within the pilot valve cavity 170 to abut or move away from the pilot valve port 181. The lower end of the pilot valve seat 180 faces the bottom of the receiving chamber 324, and is provided with a tapered bottom hole 182, and the tapered bottom hole 182 communicates with the pilot valve port 181. The valve guide chamber 170 can pass through the valve guide port 181 and communicate with the second flow path port 230 via the flow path hole 326.

Fig. 6 is an enlarged schematic view of the pilot-operated solenoid valve of fig. 4 in a partial region S.

As shown in fig. 6 and with reference to fig. 3. As a specific embodiment, the conical bottom hole 182 of the pilot valve seat 180 is in fit abutment with the conical protrusion 325 of the piston sleeve 320, and since the angle R1 of the conical bottom hole 182 of the pilot valve seat 180 is not equal to the angle R2 of the conical protrusion 325 of the piston sleeve 320 (R1> R2), the conical bottom hole 182 of the pilot valve seat 180 can be in close line sealing abutment with the conical protrusion 325 of the piston sleeve 320, thereby providing sealing reliability between the pilot valve port 181 (and the flow passage 326) and the accommodating cavity 324.

Further, the pilot valve seat 180 is sleeved in the accommodating cavity 324, and since the front end of the pilot valve element 140 is a cone, after the front end of the pilot valve element 140 abuts against the pilot valve port 181, the pilot valve seat 180 can be axially centered with the pilot valve element 140 through radial displacement adjustment, errors possibly occurring in the assembling and machining processes are made up, and the sealing reliability between the pilot valve element 140 and the pilot valve port 181 is improved.

Further, due to the use of the piston sleeve 320, the pilot valve seat 180 is at least partially disposed within the receiving cavity 324 of the piston sleeve 320. The pilot chamber 170 can communicate with the second flow path port 230 through the pilot port 181 of the pilot seat 180 and through the flow path hole 326. Therefore, compared with the background art, the electromagnetic valve has compact structure and convenient processing.

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

in the closed state of the pilot valve core, the fluid of the first flow path port 220 enters the upper part of the piston body 310 of the main valve cavity 270 through the balance hole 312 formed in the piston body 310, the downward pressure borne by the piston part 300 is greater than the upward pressure, so the piston part 300 is abutted against the main valve port 260, and the first flow path port 220 is not communicated with the second flow path port 230; when a solenoid (not shown) externally sleeved on the guide valve housing 150 is energized, under the action of the electromagnetic force, the movable iron core 130 drives the guide valve core 140 to slide upwards towards the stationary iron core 120, the guide valve port 181 is opened, the high-pressure medium in the main valve cavity 270 on the upper portion of the piston member 300 flows to the second flow path port 230 through the guide valve port 181, at this time, the downward pressure borne by the piston member 300 is smaller than the upward pressure, so that the piston member 300 moves upwards away from the main valve port 260, and the first flow path port 220 is communicated with the second flow path port 230.

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 type electromagnetic valve comprises a pilot valve part, a main valve part and a piston part, wherein the pilot valve part comprises an installation base, a pilot valve sleeve fixedly connected with the installation base, a static iron core fixedly connected with the pilot valve sleeve, a pilot valve core arranged in a pilot valve cavity of the electromagnetic valve and a movable iron core, and the pilot valve core can slide in the pilot valve cavity to abut against or be far away from the pilot valve opening of the electromagnetic valve; the main valve member including a first flow path port communicating with a main valve chamber of the solenoid valve and a second flow path port communicable with the main valve chamber through a main valve port of the solenoid valve, the piston member being slidable in the main valve chamber to abut against or away from the main valve port,

the piston component is provided with a containing cavity, the piston component is provided with a flow passage hole, the piston component is provided with a second flow passage port, the piston component is provided with a radial outer edge surface and a radial inner edge surface, the radial outer edge surface is opposite to the containing cavity, the piston component is provided with a radial inner edge surface, the radial inner edge surface is opposite to the containing cavity, the piston component is provided with a guide valve seat, the guide valve seat is at least partially arranged in the containing cavity of the piston component, the guide valve port is arranged in the guide valve seat and can be communicated with the second flow passage port through the flow passage hole of the piston component, a set gap is formed between the radial outer edge surface of the guide valve seat and the radial inner edge surface of the piston component, the radial inner edge surface faces the containing cavity,

the piston component is provided with a balance hole and further comprises an upper cylinder part, an inner hole of the upper cylinder part serves as the accommodating cavity, and the upper cylinder part can slide along the guide valve sleeve in the axial direction.

2. The pilot operated solenoid valve as described in claim 1 wherein said pilot valve seat further comprises a conical bottom orifice, said conical bottom orifice communicating with said pilot valve port; the piston component further comprises a conical protruding portion facing the conical bottom hole, the conical bottom hole is abutted to the conical protruding portion, and the angle of the conical bottom hole is not equal to that of the conical protruding portion.

3. The pilot operated solenoid valve as claimed in claim 1, wherein said mounting base comprises a base portion and a cylindrical portion, said pilot valve housing being sleeved with a central bore fixed to said base portion, an outer circumferential surface of said piston member being slidably engaged with an inner circumferential surface of said cylindrical portion.

4. The pilot type electromagnetic valve according to claim 3, wherein the piston member further comprises a sealing member that seals an outer circumferential surface of the piston member and an inner circumferential surface of the cylindrical portion.

5. The pilot operated solenoid valve as set forth in claim 1 wherein the clearance between said radially outer edge surface and said radially inner edge surface is between 1mm and 3 mm.

6. The pilot-operated solenoid valve according to any one of claims 1 to 5, wherein the piston member further comprises a piston body and a piston sleeve, the piston sleeve is fixedly fitted to a central hole of the piston body, and the receiving chamber is provided in the piston sleeve.

7. The pilot-operated electromagnetic valve according to claim 6, wherein the piston bush includes a lower cylindrical portion, an outer edge protrusion portion, and the upper cylindrical portion, the outer edge protrusion portion being engaged with the upper end portion of the piston body.

8. The pilot-operated solenoid valve according to claim 7, wherein said upper cylinder portion further comprises a circular arc portion extending at least partially into said guide valve sleeve, an outer circumferential surface of said circular arc portion being slidably engaged with an inner circumferential surface of said guide valve sleeve.

9. The pilot-operated electromagnetic valve according to claim 8, wherein the upper cylinder portion further includes a notched portion that is connected to the circular arc portion, the notched portion being provided with a radial hole that communicates with the accommodation chamber.

10. The pilot-operated solenoid valve according to claim 7, wherein the piston member further comprises a main valve sealing plug which is fitted and fixed to the lower cylinder portion.