KR101273872B1 - Pilot solenoid valve - Google Patents

Abstract

assignment

Provided is a pilot type solenoid valve which can reliably prevent the return of the main valve body without causing an increase in the number of parts, the number of processes, and the cost.

Solution

The pilot valve solenoid valve 1 which opens and closes and drives the pilot valve body 35 with the electromagnetic actuator 20, responds to this pilot valve body 35, and opens and closes the main valve body 15, The said main valve body And a stopper for restricting movement in the valve opening direction of (15), wherein the stopper includes a stopper surface portion 50D in which end surfaces of the main valve body 15 abut each other, and a stopper surface portion 50D of the main valve body. It consists of the recessed part 50E which recessed in the valve opening direction.

Actuator, solenoid valve

Description

Pilot Solenoid Valve {PILOT SOLENOID VALVE}

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows one Embodiment of the pilot solenoid valve which concerns on this invention.

2 is an enlarged view of an essential part of the pilot solenoid valve shown in FIG. 1;

3 is a cross-sectional view taken by the X-X arrow of FIG.

4 is a longitudinal sectional view showing a conventional example of a pilot solenoid valve.

<Code description>

1: pilot type solenoid valve 10: valve body

11: inlet joint (inlet) 12: outlet joint (outlet)

13: main valve chamber 14: main valve seat

15: main valve body 20: electronic actuator

25: aspirator 26: valve closing spring

30: plunger 33: valve opening spring

35: pilot valve body 37: pilot passage

40: back pressure chamber 50: guide pipe

50A: Small diameter 50B: Large diameter

50C: valve body forming portion 50D: stopper surface portion

50E: recess

Field of technology

This invention opens and closes a pilot valve body by the electromagnetic actuator which consists of a coil for energization excitation, the suction member arrange | positioned at the inner peripheral side of this coil, and the plunger arrange | positioned facing the suction member. A pilot type solenoid valve which drives and responds to this pilot valve body to open and close a main valve body.

Conventional technology

The prior art example of this kind of pilot solenoid valve is shown in FIG. 4 (refer patent document 1 etc. below). Pilot type solenoid valve 1 'of the example shown is used for refrigeration cycles, such as an air conditioner, Comprising: The valve main body 10 provided with the main valve chamber 13 which has the main valve seat (valve opening) 14, An inlet joint (inlet) 11 connected to the main valve chamber 13 of the valve body 10 and a filling joint (outlet) 12 connected downstream from the main valve seat 14 in the valve body 10. And a main valve body 15 which slides freely into the valve body 10 and folds on the main valve seat 14, and an electronic actuator 20.

The electromagnetic actuator 20 is disposed on the coil 22 for energizing excitation, the housing 21 arranged to cover the outer circumference of the coil 22, and the upper inner circumferential side of the coil 22, and the bolt 28 is provided. And cylindrical bottomed cylindrical suction column 25 fixed to the housing 21 by this, and the plunger 30 which is arrange | positioned facing this suction unit 25 is provided. The support hole 31 is provided in the front-end | tip of the plunger 30, The pilot valve body 35 which consists of balls is accommodated in this support hole 31 in the state which exposed the part of the lower surface, and caulking fixed (caulking part) (31a)). The upper part of the plunger 30 is provided with the vertical hole (spring chamber) 30a and the horizontal hole (pressure equalizing hole) 30b which the valve closing spring 26 which consists of a coil spring inserts and latches.

The plunger 30 slides freely in the guide pipe 32 in which the upper part is arrange | positioned between the coil 22 and the aspirator 25. As shown in FIG. The upper end 32a of the guide pipe 32 is fixed to the outer circumferential step of the aspirator 25 by a method such as welding, and the outer circumferential portion of the lower end flange 32b of the valve body 10 The upper inner circumferential step 16 is sealed. The lower flange portion 32b of the guide pipe 32 is caulked with the ring-shaped member 17 interposed therebetween by a caulking portion 16a provided in the upper inner circumferential step portion 16 of the valve body 10. The caulking portion 16a, the ring-shaped member 17, and the guide pipe 32 are fixed by soldering (soldering portion 18).

The main valve body 15 is a unitary cast member consisting of an outer circumferential member 15B made of brass and an inner circumferential member 15A made of teflon in cross-sectional convex shape which is internally wound and caulked and fixed (caulking part 15c). The pilot passage 37 is opened and closed by the pilot valve body 35 so as to penetrate through the central portion thereof. In the outer circumferential member 15B of the main valve body 15, a equalizing hole 19 is formed so as to contact the inner circumferential member 15A.

Moreover, the valve opening spring 33 which consists of a coil spring which adds the main valve body 15 to a valve opening direction is shrink-equipped in the main valve chamber 13.

Between the plunger 30 and the main valve body 15 is the back pressure chamber 40, when the main valve body 15 is closed, it is introduced into the main valve chamber 13 from the inlet joint (inlet) 11. The supplied fluid is introduced into the back pressure chamber 40 between the outer circumferential surface of the main valve body 15 and the inner circumferential surface of the valve body 10 (between the slide surfaces), and the plunger 30 is introduced from the back pressure chamber 40. Between the outer circumferential surface of the guide pipe 32 and the inner circumferential surface of the guide pipe 32 (between the slide surfaces) and the horizontal hole 30b and the vertical hole 30a, and between the lower surface of the aspirator 25 and the plunger 30. It is also led to the gap space S formed.

In addition to the above configuration, in the pilot type solenoid valve 1 ′ of the illustrated example, the lower circumferential side (flat surface) of the lower flange portion 32b of the guide pipe 32 opens the valve of the main valve body 15. It is a stopper surface part which regulates the movement of a direction (upward).

In the pilot solenoid valve 1 'having such a configuration, when the coil 22 is energized, the plunger 30 is attracted to the suction 25 and attracted thereto, and with this, the pilot valve body 35 Is moved (lifted) in the valve opening direction (upward). As a result, the pilot passage 37 opens, and the fluid in the back pressure chamber 40 passes through the pilot passage 37 at once and is discharged to the outlet joint (outlet) 12. For this reason, the back pressure chamber 40 is depressurized, the main valve body 15 is lifted by the biasing force of the valve opening spring 33, and valve opening is carried out. In this case, the main valve body 15 is lifted until the upper end face of the stopper face part (inner circumferential side portion of the lower flange portion of the guide pipe 32) 32b faces each other, and the stopper face part 32b. Surface contact with the ring-shaped flat surface and stop.

Patent Document 1: Japanese Patent Laid-Open No. 10-103556

However, in the conventional pilot solenoid valve as described above, since the entire upper surface of the main valve body (ring flat surface) is brought into surface contact with the stopper surface portion (ring flat surface), the stopper surface portion and the main valve body are in contact with each other. Even if the pilot valve body 35 tries to return to the valve closing direction (downward) by the fluid (refrigerant) or surface tension (sucking action) of the lubricating oil, the main valve body does not fall into the stopper surface portion and fall. This may not return to the valve closed state.

In order to prevent such a return of the main valve body, it is necessary to provide a special stopper separately or to perform special processing on the main valve body. Tend to be.

This invention is made | formed in view of the said situation, The objective is the pilot type electronic which can reliably prevent the return of a main valve body, without causing an increase in the number of components, process number, and cost. It is to provide a valve.

In order to achieve the above object, the pilot solenoid valve according to the present invention is basically configured to open and close the pilot valve body by an electromagnetic actuator, and operate according to the pilot valve body to open and close the main valve body. And a stopper for restricting movement in the valve opening direction of the main valve body, wherein the stopper includes a stopper face portion where the end faces of the main valve body are in contact with each other, and a concave portion concave in the valve opening direction of the main valve body from the stopper face portion. It is characterized by.

More specifically, a valve main body provided with a main valve chamber having a main valve seat, a main valve body which is in contact with the main valve seat, an inlet provided upstream from the main valve seat, an outlet provided downstream from the main valve seat, and A valve opening spring for adding the main valve body in the valve opening direction, a valve closing spring for adding the pilot valve body in the valve closing direction, a coil for energizing excitation, and a suction member disposed on the inner circumferential side of the coil; A plunger disposed opposite the aspirator, a pilot valve body adapted to move integrally with the plunger, a back pressure chamber formed between the plunger and the main valve body, and a pilot passage communicating with the back pressure chamber and the outlet; The pilot passage is opened and closed by the pilot valve body.

And a stopper for restricting movement in the valve opening direction of the main valve body, wherein the stopper includes a stopper face portion in which end faces of the main valve body are in contact with each other, and a concave portion concave in the valve opening direction of the main valve body from the stopper face portion. It is characterized by consisting of.

The pilot passage is preferably formed in the main valve body.

The back pressure chamber is preferably divided into the plunger, a pilot valve body attached to the tip of the plunger, a guide pipe serving as a guide of the plunger, and the main valve body.

The guide pipe preferably includes a small diameter portion in which the plunger slides freely and a large diameter portion in which the main valve body slides freely, and the end portion between the small diameter portion and the large diameter portion, It is a stopper which has the said stopper surface part and a recessed part.

The pilot valve body is preferably made of a ball.

In the pilot solenoid valve according to the present invention, the stopper includes a stopper face portion where the end faces of the main valve body are in contact with each other, and a recess that is concave in the valve opening direction of the main valve body from the stopper face portion. And the entire surface of the end face of the main valve body is not in surface contact with the stopper face as in the related art, so that the suction force due to the surface tension is weakened. Therefore, it is possible to reliably prevent the main valve body from returning.

In addition, since the press drawing process is applied to the pipe, which is the material of the guide pipe, and the stopper consisting of the stopper surface portion and the recessed portion can be integrally formed, the solution is solved without causing an increase in the number of parts and the number of maneuvers, and the cost is kept low. can do.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the pilot type solenoid valve of this invention is described, referring drawings.

1 is a longitudinal sectional view showing an embodiment of a pilot solenoid valve according to the present invention.

In the pilot solenoid valve 1 of the shown embodiment, the code | symbol common is attached | subjected to the part which has the same structure or the same function as each part of the pilot type solenoid valve 1 'of the conventional example shown in FIG. 4 mentioned above. The overlapping description is omitted, and the differences will be mainly described below.

The pilot solenoid valve 1 of this embodiment is also used for refrigeration cycles, such as an air conditioner, for example, and the structure of a guide pipe differs from the above-mentioned conventional example.

That is, the guide pipe 50 of this embodiment is as shown in FIG.2, FIG.3, 50A of small diameter parts which the plunger 30 slides freely, and the main valve body 15 slide freely. A large diameter portion 50B to be placed and a valve body forming portion 50C having a larger diameter than that of the large diameter portion 50B, and the end portion between the small diameter portion 50A and the large diameter portion 50B has a flat stopper surface portion ( 50D) and the stopper which has concave part 50E (three places by 120 degree space | interval) of the cross-sectional triangular shape concave up.

In other words, press-drawing is given to the pipe which is a raw material of the guide pipe, and the main valve body 15 is formed from the stopper surface portion 50D and the corresponding stopper surface portion 50D where the end surfaces (upper end surfaces) of the main valve body 15 come into contact with each other. The recessed part 50E which was recessed in the valve opening direction of () is integrally molded.

In addition, a concave portion 15b serving as a back pressure chamber 40 is formed in an upper portion of the main valve element 15, and an upper end surface portion 15a on the outer circumferential side of the concave portion 15b is formed on the stopper surface portion 50D. It is supposed to be face to face.

In the pilot type solenoid valve 1 having such a configuration, when the coil 22 is energized, the plunger 30 is attracted to the aspirator 25 and adsorbed, and with this, the pilot valve body 35 It is moved (lifted) in the valve opening direction (upward). As a result, the pilot passage 37 opens, and the fluid in the back pressure chamber 40 passes through the pilot passage 37 at once and is discharged to the outlet joint (outlet) 12. For this reason, the back pressure chamber 40 is depressurized and the main valve body 15 is lifted and opened by the biasing force of the valve opening spring 33. In this case, the main valve body 15 is lifted until the upper end surface portion 15a is brought into contact with the stopper surface portion 50D and stopped in surface contact with the stopper surface portion 50D.

Here, in the present embodiment, the stopper is concave in the valve opening direction of the main valve body 15 from the stopper surface portion 50D where the upper end surface portion 15a of the main valve body 15 abuts each other and the stopper surface portion 50D. Since the recess 50E is &quot; released &quot; and the entire surface of the end face portion of the main valve body is not in surface contact with the stopper face portion as in the prior art, the suction force due to the surface tension Weakens. Therefore, the return of the main valve body 15 can be prevented reliably.

In addition, since the stopper which consists of the stopper surface part 50D and the recessed part 50E can be integrally formed by pressing drawing process to the pipe which is a raw material of a guide pipe, it does not cause an increase in the number of parts, a process number, etc. It is possible to reduce the cost.

In the pilot solenoid valve according to the present invention, the stopper includes a stopper face portion where the end faces of the main valve body are in contact with each other, and a recess that is concave in the valve opening direction of the main valve body from the stopper face portion. And the entire surface of the end face of the main valve body is not in surface contact with the stopper face as in the related art, so that the suction force due to the surface tension is weakened. Therefore, it is possible to reliably prevent the main valve body from returning.

In addition, since the press drawing process is applied to the pipe, which is the material of the guide pipe, and the stopper consisting of the stopper surface portion and the recessed portion can be integrally formed, the solution is solved without causing an increase in the number of parts and the number of maneuvers, and the cost is kept low. can do.

Claims (6)

delete The actuator opens and closes the pilot valve body by an electronic actuator, operates according to the pilot valve body to open and close the main valve body, A valve main body provided with a main valve chamber having a main valve seat, a main valve body that is in contact with the main valve seat, an inlet provided upstream of the main valve seat, an outlet provided downstream of the main valve seat, and the main valve body are opened. A valve opening spring added in the direction, a valve closing spring that applies the pilot valve element in the valve closing direction, a coil for energizing excitation, a suction member disposed on the inner circumferential side of the coil, and the suction member facing each other. And a pilot passage formed in the main valve body so as to communicate the back pressure chamber and the outlet with the pilot valve body configured to move integrally with the plunger, the back pressure chamber formed between the plunger and the main valve body. And a pilot solenoid valve configured to open and close the pilot passage by the pilot valve body. And a stopper for restricting the movement of the main valve body in the valve opening direction, wherein the stopper comprises a stopper face portion in which end faces of the main valve body are in contact with each other, and a concave portion concave in the valve opening direction of the main valve body from the stopper face portion. , The back pressure chamber is partitioned into the plunger, a pilot valve body attached to the tip of the plunger, a guide pipe serving as a guide of the plunger, and the main valve body, The guide pipe includes a small diameter portion into which the plunger slides freely and a large diameter portion into which the main valve body slides freely, and a end portion between the small diameter portion and the large diameter portion includes a stopper surface portion and the concave portion. A pilot type solenoid valve, characterized in that. 3. The method of claim 2, The pilot valve body is made of a ball, characterized in that the pilot solenoid valve. delete delete delete

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