JPH04264606A - Pilot type electromagnetic valve - Google Patents

Abstract

PURPOSE:To obtain a pilot type electromagnetic valve which is inexpensive, which can control a large amount of fluid and whose diameter is large. CONSTITUTION:A valve body 105 which opens/closes the valve seat 103 of a valve mainbody 100 and controls the flow of fluid from a first fluid channel opening part 101 to a second fluid channel opening part 102, and the plunger 116 of the pilot electromagnetic valve 114 which controls the difference pressure of a back room 109 and the second fluid channel opening part 102 and moves up and down the valve body 105 are separately arranged. Since a plunger stroke does not need to be made large even in the electromagnetic valve of the large diameter, a coil can be made small and cost can be reduced. Shock which the plunger is abutted on an absorber is made small, noise can be reduced and a life can be prolonged.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot type solenoid valve for controlling a fluid flow path, and more particularly to an improvement in a large diameter solenoid valve used when the flow rate of fluid is large.

0002

2. Description of the Related Art A conventional pilot type solenoid valve 1 disclosed in Japanese Patent Laid-Open No. 62-274177 etc. is as shown in FIG.
A valve body 4 that closes the valve seat 3 is fitted into the valve body 2 so as to be movable up and down, and a plunger 5 located directly above the valve body 4 is fitted so as to be movable up and down. A suction element 6 located at is inserted.

[0003] A pilot orifice 7 is vertically bored in the valve body 4 . In addition, the plunger 5 has a ball 8 attached to the lower part of the pilot orifice 7 by a method such as caulking, and between the upper part and the lower part of the suction element 6, the ball 8 is pressed against the pilot orifice 7. A spring 9 is interposed therebetween. and,
A housing 10 is fitted into the upper part of the valve body 2, and a coil 11 is disposed inside the housing 10.

Therefore, when the coil 11 is energized, the plunger 5 is attracted to the suction element 6 while compressing the spring 9 and opens the pilot orifice 7, and the back pressure of the valve body 4 escapes to the outlet 12. The valve body 4 rises due to the pressure difference between the outflow port 12 and the inflow port 13, and the fluid flows from the inflow port 13 to the outflow port 12.
flows to.

[0005]

[Problems to be Solved by the Invention] The conventional pilot type solenoid valve 1 is constructed as described above, and includes a valve body 4 and a plunger 5.
Therefore, if the valve seat 3 is to be used with a large flow rate, the inner diameter of the valve seat 3 must be increased, and the stroke of the valve body 4 must be increased. There was a problem in that the stroke of the plunger 5 also increased accordingly. Furthermore, it is necessary to strengthen the suction force of the plunger 5, which causes the problem that the coil 11 becomes large and expensive. Furthermore, as the stroke of the plunger 5 becomes larger, the impact of the plunger 5 colliding with the suction element 6 also becomes stronger, which causes problems in terms of noise and lifespan.

The present invention has been made in view of the above, and an object of the present invention is to provide a large-diameter pilot type solenoid valve that is inexpensive and capable of controlling a large flow rate.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the present invention, a first fluid passage opening provided inside a valve body on the side of the valve body and a second fluid passage on a lower part of the valve body are provided. A valve seat through which fluid flowing through the opening passes, a valve body that is fitted into a valve chamber in the valve body so as to be able to move up and down and closes the lower valve seat based on the elastic force of the spring, and a valve chamber and a valve. It is characterized by comprising a back chamber defined between the upper body parts and a pilot solenoid valve that controls the differential pressure between the back chamber and the second fluid passage opening.

[0008] Furthermore, the valve body or the valve chamber is characterized in that an elastic member is disposed on the valve body or the valve chamber to absorb a shock applied to the valve body when the valve seat is opened.

[0009]

According to the present invention, since the valve body and the plunger are separated from each other, there is no need to increase the plunger stroke even in a large-diameter electromagnetic valve, so that the coil can be made smaller. Furthermore, the impact of the plunger colliding with the suction element is small, resulting in lower noise and longer life. Furthermore, by providing an elastic member such as Teflon on the back of the valve body or inside the valve chamber at a position that takes the necessary stroke to open and close the valve body, the impact of the valve body colliding with the lid or stopper can be reduced. This makes it possible to achieve even lower noise.

0010

[Embodiment] Hereinafter, a pilot type solenoid valve 1A according to the present invention will be described in detail based on an embodiment shown in FIG. The opening 101 is provided with a second fluid passage opening 102 at the lower part, and inside the opening 101 is provided with a second fluid passage opening 102 from the first fluid passage opening 101.
A valve seat 103 is provided in a protruding manner through which a flowing fluid passes through a fluid passage opening 102 of the valve seat 10 .
A valve chamber 104 located above 3 is formed.

A valve body 105 that opens and closes the valve seat 103 is fitted into the valve chamber 104 so as to be movable up and down.
A hole 106 is perpendicularly drilled in the center. Also,
A lid 1 is provided above the opening of the valve body 100, which seals the valve chamber 104 and also serves as a stopper for the raised valve body 105.
07 is attached, and a spring 108 is interposed between the lower surface of the lid 107 and the lower part of the hole 106 to elastically bias the valve body 105 against the valve seat 103. And canopy 107
A back chamber 109 is defined between the lower surface and the upper part of the valve body 105 , and the fluid that has flowed into the first fluid passage opening 101 is allowed to flow into the back chamber 109 . It is designed to flow in through the gap.

[0012] Also, on the upper side of the valve body 100, a protrusion 1 is provided.
10 is provided protrudingly, and inside this protrusion 110, a conduit passage 111 for guiding fluid is bored, and a pilot port 112 is also bored. The second tube is guided by the tube 113.
It is adapted to be discharged into a connecting pipe connected to a fluid passage opening 102 of.

A pilot solenoid valve 114 is mounted on the protrusion 110, and this pilot solenoid valve 114 opens and closes a pilot port 112 inside a guide tube 115 inserted vertically into the protrusion 110. Plunger 1
16 is fitted so as to be movable up and down, and a suction element 117 located directly above the plunger 116 is screwed onto the plunger 116. Between the lower part of the suction element 117 and the upper part of the plunger 116, the plunger 116 is forced into the pilot port 112. A biasing spring 118 is interposed. A housing 119 is provided at the upper part of the guide tube 115.
is fitted into the housing 119, and an electromagnetic coil 120 is disposed inside the housing 119.

Therefore, when the electromagnetic coil 120 is not energized, the plunger 116 elastically biased by the spring 118 closes the pilot port 112. The fluid that has flowed into the first fluid passage opening 101 passes through the small gap between the valve chamber 104 and the valve body 105 into the back chamber 10.
9, pressurizes the back chamber 109 and pressurizes the valve seat 103.
The valve body 105 is strongly pressed against the first fluid passage opening 10.
The valve body 105 blocks the flow of fluid from the first fluid passage opening 102 to the second fluid passage opening 102.

On the other hand, when the electromagnetic coil 120 is energized, the plunger 116 compresses the spring 118 and is attracted to the attractor 117 to open the pilot port 112, and the fluid in the back chamber 109 flows through the conduction path 111, The gas is discharged to the connecting pipe through the pilot port 112 and the conduit pipe 113 in order, and the pressure in the back chamber 109 is reduced. And the first
Due to the pressure of the fluid flowing into the lower part of the valve body 105 from the fluid passage opening 101 , the valve body 105 moves up while compressing the spring 108 , and the valve seat 103 is opened and the fluid flows into the first fluid passage opening 101 . to the second fluid passageway opening 102 .

According to the above structure, since the valve body 105 and the plunger 116 of the pilot solenoid valve 114 are separated, there is no need to increase the stroke of the plunger 116 even if the stroke of the valve body 105 is increased, and a small coil can be used. The large-diameter valve seat 103 can be opened, and a large-diameter electromagnetic valve can be provided at low cost. Further, since there is no need to increase the stroke of the plunger 116, the impact of the plunger 116 colliding with the suction element 117 can be reduced, making it possible to reduce noise and extend the life.

Next, FIG. 2 shows a second embodiment of the present invention, in which an elastic member 121 made of Teflon or the like is superimposed on the upper part of the valve body 105.

[0018] This embodiment can also be expected to have the same effect as the above embodiment, and since the elastic member 121 absorbs the impact when the valve body 105 collides with the lid 107, it is possible to reduce noise. It is obvious that it can be done.

Next, FIG. 3 shows a third embodiment of the present invention, in which the valve body 105 in the valve chamber 104 is
A stopper ring 122 made of an elastic member is fitted in a position that ensures the necessary stroke for opening and closing.

[0020] This embodiment can also be expected to have the same effect as the above embodiment, and it is obvious that the valve body 105 collides with the stopper ring 122 and the impact is reduced, so that noise can be reduced. It is.

[0021]

As described above, according to the present invention, the fluid that is provided inside the valve body and flows from the first fluid passage opening on the side of the valve body to the second fluid passage opening on the lower part of the valve body. a valve seat that is passed through the valve seat and a valve body that is vertically movably inserted into the valve chamber in the valve body and closes the lower valve seat based on the elastic bias of the spring;
It includes a back chamber defined between the valve chamber and the upper part of the valve body, and a pilot solenoid valve that controls the differential pressure between the back chamber and the second fluid passage opening. Since the plunger is separated, there is no need to increase the stroke of the plunger even if the stroke of the valve body is increased.
This has the effect that a large diameter valve seat can be opened with a small coil, and a large diameter solenoid valve can be provided at a low cost. Furthermore, since there is no need to increase the stroke of the plunger, the impact of the plunger colliding with the suction element can be reduced, resulting in the effects of lower noise and longer life.

Furthermore, since an elastic member is provided in the valve body 2 or the valve chamber to absorb the impact applied to the valve body when the valve seat is open, the impact can be reduced and noise can be reduced. There is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a pilot-type solenoid valve according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the pilot type solenoid valve according to the present invention.

FIG. 3 is a cross-sectional view showing a third embodiment of the pilot type solenoid valve according to the present invention.

FIG. 4 is a sectional view showing a conventional pilot type solenoid valve.

[Explanation of symbols]

1 Pilot operated solenoid valve 1A
Pilot operated solenoid valve 100 Valve body 101 First fluid passage opening 102 Second fluid passage opening 103 Valve seat 104 Valve chamber 105 Valve body 108 Spring 109 Back chamber 114 Pilot solenoid valve 116 Plunger 121 Elastic member 122 Stopper ring

Claims (2)

[Claims] 1. A valve seat provided inside the valve body and through which fluid flows from a first fluid passage opening on the side of the valve body to a second fluid passage opening at the bottom of the valve body; a valve body that is vertically movably inserted into the valve chamber within the valve body and closes the lower valve seat based on the elastic force of the spring, a back chamber defined between the valve chamber and the upper part of the valve body, and this back chamber. A pilot-type solenoid valve comprising a pilot solenoid valve that controls the differential pressure between the first fluid passage opening and the second fluid passage opening. 2. The pilot type solenoid valve according to claim 1, wherein an elastic member is disposed in the valve body or the valve chamber to absorb a shock applied to the valve body when the valve seat is open.