JPH02159486A - Electromagnetic valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a solenoid valve capable of adjusting flow rate.

BACKGROUND ART Conventionally, this type of solenoid valve has had a structure as shown in FIG. 2, as shown in Japanese Utility Model Publication No. 7908/1983.

That is, by moving the valve body 101 away from the valve seat 102, it is possible to set a large flow rate, and by bringing the valve body 101 and the valve seat 102 into contact, it is possible to set a low flow rate through the small hole 104. Become.

Problems to be Solved by the Invention However, with such a structure, when the valve movable part moves due to the tM1 operation, a suction noise is generated when it collides with the suction element 103.

Further, when a solenoid valve having such a configuration is used to adjust the flow rate of refrigerant in an air conditioner or the like, there is a problem in that refrigerant noise is generated because the refrigerant expands rapidly near the exit of the small hole 104.

Furthermore, it is difficult to machine a complicated small hole 104 like the one shown in FIG. There may be cases where this is not the case.

Therefore, the present invention aims to reduce noise even when the valve movable part (plunger) is adsorbed or when a refrigerant is passed through it, and is also easy to process and provides a stable flow rate.

! ! ! ! Means for Solving the Problems and Technical Means of the present invention for solving the above problems is to reduce the contact area (
It is equipped with a protrusion.

Further, an enlarged portion with a large opening area is formed on the outlet side of the small hole formed in the valve body of the plunger.

Further, the small hole is formed by a penetrating horizontal hole and a vertical hole extending in a direction perpendicular to the horizontal hole and opening at the tip of the valve body.

action The effects of these technical means are as follows.

That is, in the present invention, when the valve movable part is attracted, since the contact area between the plunger and the imprint stone is small, the suction noise is reduced.

In addition, when used to adjust the refrigerant flow rate, the refrigerant expands slowly near the outlet of the small hole, so pressure fluctuations in this area are suppressed and the sound when the refrigerant passes is reduced.

Furthermore, in the present invention, the structure is such that the small hole provided in the valve movable portion is passed through, thereby facilitating workability. Furthermore, since the number of small holes is reduced to two due to the penetration, the flow rate remains stable even when the valve movable part rotates.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

First, the overall structure of the solenoid valve will be explained with reference to FIG.

In the figure, 1 is the solenoid valve body, the electromagnet part 2 and the valve 3.
It is composed of

The electromagnet section 2 includes an iron core 201, a coil 202 surrounding the core, a housing 203 housing these, and a lead wire 2 for energizing the coil 202.
04, it is composed of a plunger 206 that is attracted by the magnetic force of the iron core 201 and the coil 202, and is always urged in a direction away from the iron core 201 by a spring 205. The iron core 201 is fixed to the housing 203 with bolts 208 via washers 207.

The valve part 3 is formed by a valve case 303 provided with fluid passage pipes 301 and 302, passage parts 304 and 305 that communicate the fluid passage pipes 301 and 302, and a valve seat 306 formed at the end of the passage part 305. has been done.

4 is a smoothed valve body part provided at the tip of the plunger 206 and is in contact with the valve seat 306, and the plunger 206
communication of the passage portions 304 and 305 by the vertical movement of;
Performs a cutoff operation.

The valve body portion 4 includes a through passage 401 formed at the tip of the plunger 206, a passage 402 provided in a direction perpendicular to the through passage 401 and opened at the tip of the plunger 206, and a passage 402 formed at the tip of the plunger 206. It is comprised of an enlarged part 403 formed so that its opening area gradually increases on the exit side.

Furthermore, a protrusion 5 is provided on the end surface of the plunger 206 that comes into contact with the iron core 201 to reduce the area of contact with the iron core 201. This protrusion 5 slightly protrudes from the end surface of the plunger 206.

Next, the fluid flow control operation of the electromagnetic valve having the above configuration will be explained.

First, the state when the solenoid valve is fully open will be explained.

In this case, when the coil 202 is energized, the plunger 20
6 is attracted to the absorber core 201. At this time, a sound is generated due to the collision between the plunger 206 and the iron core 201, but since the cross-sectional area of the contact part is made very small by the protrusion 5,
The contact area is small and the adsorption sound is small.

Next, a case will be described in which the solenoid valve having the above configuration is used to adjust (throttle) the flow rate of refrigerant in an air conditioner or the like.

Furthermore, it flows through the enlarged portion 403 . When passing through this enlarged portion 403, the refrigerant expands slowly, so pressure fluctuations during expansion are suppressed, and the sound when the refrigerant passes is small. Therefore, even if the plunger 206 rotates, a constant flow rate can always be obtained.

In this embodiment, the protrusion 5 is connected to the plunger 206.
However, the protrusion 5 may be provided on the iron core 201 side, or may be provided on both the plunger 206 and the iron core 201 so that their axes coincide with each other.

Effects of the Invention As is clear from the above embodiments, the solenoid valve of the present invention provides the following effects.

(]) By reducing the contact area between the valve plunger and the iron core, the impact noise when the valve is fully opened can be reduced.

[2] By creating a structure in which the vicinity of the exit of the small hole passage is gradually expanded, it is possible to reduce the sound of refrigerant passing when fluid is used as a refrigerant.

(3) By forming a horizontal hole passing through the small hole passage, the fluid can have two inlets, resulting in a stable flow rate and easy machining.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a solenoid valve showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional solenoid valve. 1... Solenoid valve body, 2... Electromagnet part,
3... Valve part, 4... Valve body part, 20
1... Iron core, 202... Coil, 20
5...Spring, 206...Plunger,
306... Valve seat, 401... Channel, 4
02...Flow path, 403...Enlarged part. Name of agent Patent attorney Shigetaka Awano 1 person 1- to magnetic valve body 2--electromagnet part 3- valve part 4--#body part 201---3 to 75 pieces (:; 2Q2---- Coil 20E---Spring 2f) 6---Bunjar, 706---Valve Eaves 4Q+, 4Q2・-Flow path orientation---Low Large part Figure 1 Figure 2 q2

Claims (3)

[Claims] (1) Equipped with an electromagnet consisting of a coil and an iron core at one end,
A cylindrical electromagnetic valve body having a valve seat formed at the other end is provided with a plunger that is attracted to the iron core of the electromagnet and is biased so as to be in contact with the valve seat on the normally closed side, so that the plunger can move forward and backward, and the electromagnet A solenoid valve, wherein a protrusion is provided on a contact surface between the electromagnet and the plunger to reduce the contact area, and the protrusion is provided on at least one of the contact surfaces of the electromagnet and the plunger. (2) A valve body that comes into contact with the valve seat is provided at the tip of the plunger, a small hole passage is provided inside the valve body that communicates both passages sandwiching the valve seat, and the opening area of the small hole passage is on the outlet side. The electromagnetic valve according to claim 1, wherein a large enlarged portion is formed. (3) The small hole passage is formed by a horizontal hole penetrating in a direction perpendicular to the direction of movement of the plunger, and a vertical hole extending in a direction perpendicular to the horizontal hole and opening at the tip of the valve body. Solenoid valve described in section.