JPH09280391A - Valve seat structure of three-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a valve opening force by a fluid pressure for a second on-off valve by a method wherein the seat diameter of a second valve seat is decreased to a value lower than that of the seat of a first valve seat. SOLUTION: A flow passage diabeter of one end 20B of a valve seat flow passage 20 fronting on a first flow passage 3 is ϕA, and the flow passage diameter of the other end 20A thereof fronting on a second flow passage 2 is decreased to a value lower than a flow passage diameter ϕA. Namely, the seat diameter of the first valve seat 6 consists of ϕA and the seat diameter of the second valve seat 5 consists of ϕB, and ϕA is greater than ϕB. In this way, a flow rate of fluid flowing in a third flow passage 7 from the first flow passage 3 during non-energization to an electromagnetic device S and a flow rate flowing in the second flow passage 2 from the third flow passage 7 during energization to the electromagnetic device S are adjusted to a desired flow rate. Thus, by reducing the seat diameter ϕB of the second valve seat 5 to a value lower than the valve diameter ϕA of the first valve seat 6, only a valve opening force exerted on the second on-off valve 10 is reduced.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a first state in the first state.
The on-off valve opens the first valve seat and the second on-off valve opens the second
When the valve seat is closed, the first valve seat communicates the first flow passage and the third flow passage, and the second valve seat closes the third flow passage and the second flow passage, while in the second state, the first flow passage is closed. When the open / close valve closes the first valve seat and the second open / close valve opens the second valve seat, the first valve seat closes the first flow path and the third flow path, and the second valve seat opens the third flow path. The present invention relates to a three-way valve that connects a flow passage and a second flow passage, and relates to a valve seat structure of the first valve seat and the second valve seat. This three-way valve is used for switching the flow of the fluid flowing in the fluid passage and for switching the pressure.

[0002]

2. Description of the Related Art A conventional three-way valve valve seat structure is shown in FIG.
Is shown in Reference numeral 1 denotes a valve body, and a bottom portion 2 below the upper end.
The second flow path 2 is recessed toward A. This second channel 2
Opens to the side of the valve body 1 and is connected to the flow path of a device (not shown). Further, the first flow path 3 is recessed from the lower end of the valve body 1 toward the upper bottom portion 2B. This first channel 3 is the valve body 1
Of the device shown in FIG.

The lower bottom portion 2A and the upper bottom portion 2B are connected by a valve seat passage 4 having a diameter A, and the other end 4A above the valve seat passage 4 has a first The second valve seat 5 is formed so as to face and open in the two flow paths 2, and one end 4B below the valve seat 4 is formed.
A first valve seat 6 is formed in the first valve seat 6 so as to face and open in the first flow path 3.

The seat diameters of the second valve seat 5 and the first valve seat 6 are the same as the diameter of the valve seat flow passage 4.
By having a straight diameter of A, both have a sheet diameter of φA.

A third portion is provided in the middle of the valve seat channel 4.
The flow path 7 is opened, and the third flow path 7 is
Of the device shown in FIG.

A first opening / closing valve 8 is movably arranged in the first flow path 3 and controls opening / closing of the first valve seat 6, and is biased by a spring 9 to close the first valve seat 6. It Reference numeral 10 denotes a second opening / closing valve that is movably arranged in the second flow passage 2 and controls opening / closing of the second valve seat 6. Below the second opening / closing valve 10, a valve seat passage 4 is provided. Pushing rod 10A for pushing the first opening / closing valve 8
Is integrally formed, and a connecting rod 10B is integrally formed above the second opening / closing valve 10.

Reference numeral S denotes an electromagnetic device in which a coil bobbin 13 around which a coil 12 is wound is housed and arranged in a housing 11 having a cylindrical shape with a bottom, and the coil bobbin 13 is integrally formed at the bottom of the housing 11. The fixed core 14 is inserted and arranged, and the movable core 1 is opposed to the fixed core 14.
5 is movably arranged. Reference numeral 16 is a spring that is contracted between the movable core 15 and the fixed core 14.

The electromagnetic device S is fixedly arranged on the valve body 1, and the upper end of the connecting rod 10B integrally formed with the second opening / closing valve 10 is integrally attached to the movable core 15. It Therefore, the second opening / closing valve 10 including the pressing rod 10A and the connecting rod 10B moves integrally with the movable core 15.

Then, when the coil 12 of the electromagnetic device S is not energized, the movable core 15 is pressed downward by the spring force of the spring 16, whereby the second open / close valve 1
0 closes the second valve seat 5, while the first opening / closing valve 8 is pressed downward by the pressing rod 10A to open the first valve seat 6. Therefore, the first flow path 3 and the third flow path 7 communicate with each other, and the second flow path 2 is blocked from the first flow path 3 and the third flow path 7.

When a current is supplied to the coil 12 of the electromagnetic device S, the movable core 15 is attracted to the fixed core 14 by the magnetic force and moves upward against the spring force of the spring 16. According to this, since the pressure on the first opening / closing valve 8 by the pressing rod 10A is released, the first opening / closing valve 8 is moved upward by the spring 9 to close the first opening / closing valve 8 or the first valve seat 6, On the other hand, the second opening / closing valve 10 opens the second valve seat 5. Therefore, the third flow path 7 and the second flow path 2 are communicated with each other,
The first flow path 3 is cut off from the third flow path 7 and the second flow path 2.

[0011]

According to such a conventional valve seat structure of a three-way valve, when the electromagnetic device S is not energized, the third flow path 7 is passed from the first flow path 3 through the first valve seat 6. The flow rate of the fluid flowing into the inside is X (L / H), and when the electromagnetic device S is energized, it flows into the second passage 2 from the third passage 7 through the second valve seat 5. The flow rate of the fluid is Y (L / H). Since the seat diameter of the first valve seat 6 and the seat diameter of the second valve seat 5 are formed in the valve seat passage 4 having a single diameter A, the flow rate Y (L / H) is Flow rate X (L / H)
Larger flow rate.

Here, the flow rate X (L / H) of the fluid flowing from the first flow path 3 into the third flow path 7 and the second flow path from the third flow path 7 to the second flow path 7
Considering the flow rate Y (L / H) of the fluid flowing into the flow path 2, the flow rate is a predetermined flow rate Q (L / H).
Must be satisfied. From the relationship of the above-mentioned flow rate X (L / H) <flow rate Y (L / H), the flow rate X (of the fluid flowing from the first flow path 3 to the third flow path 7 via the first valve seat 6 is L / H) is defined by Q (L /
H) The diameter A of the valve seat flow path 4 should be A or higher
Is selected. In other words, the seat diameter of the first valve seat 6 and the seat diameter of the second valve seat 5 are selected as the diameter A. In addition, from the third flow path 7 to the second flow path 2
The flow rate Y (L / H) of the fluid flowing in is X (L / H)
A flow rate equal to or higher than Q (L / H) determined from the relationship of <Y (L / H) is obtained.

Here, the valve opening force due to the fluid pressure on the second opening / closing valve 10 is determined by the seat diameter A of the second valve seat 5, and it is desirable that the valve opening force due to the fluid pressure is as small as possible. . This is because the valve opening force by the fluid is small, the spring force of the spring 16 can be small, the suction force generated in the electromagnetic device can be small, and the entire electromagnetic device can be made compact. .

An object of the valve seat structure of a three-way valve according to the present invention is to provide a valve seat structure capable of reducing the valve opening force due to the fluid pressure on the second on-off valve.

[0015]

In order to achieve the above object, a valve seat structure of a three-way valve according to the present invention has a valve body, one end of which opens into a first flow path and the other end of which has a second flow path. A valve seat flow path that opens inside is formed, and a first valve seat is formed at one end of the valve seat flow path that faces the first flow path and is opened and closed by a first opening / closing valve, and the other end of the valve seat flow path Second to
In a three-way valve that faces the flow path and forms a second valve seat that is opened and closed by the second opening / closing valve, and further has a third flow path opened in the middle of the valve seat flow path, the seat diameter of the second valve seat Is smaller than the seat diameter of the first valve seat.

[0016]

Since the seat diameter of the second valve seat is smaller than the seat diameter of the first valve seat, the valve opening force by the fluid pressure to the second opening / closing valve that opens and closes the second valve seat can be reduced. Therefore, the spring force of the spring of the electromagnetic device can be weakened and the electromagnetic device can be made compact.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve seat structure of a three-way valve according to the present invention will be described with reference to FIG. Note that the same reference numerals are used for the same structural parts as in FIG. 2, and the description will be omitted. Valve seat channel 20
Has a flow path diameter of φA at one end 20B facing the first flow path 3, and a flow path diameter φB of the other end 20A facing the second flow path 2 is smaller than the flow path diameter φA. That is, the seat diameter of the first valve seat 6 is formed with φA, the seat diameter of the second valve seat 5 is formed with φB, and they are φA> φB.
Becomes The seat diameter φA of the first valve seat 6 is the same as the seat diameter φA of the first valve seat 6 of FIG.

Then, when the coil 12 of the electromagnetic device S is not energized, the movable core 15 is pressed downward by the spring force of the spring 16, whereby the second open / close valve 1
0 closes the second valve seat 5, while the first opening / closing valve 8 is pressed downward by the pressing rod 10A to open the first valve seat 6. According to the above, the fluid in the first flow path 3 is
It flows into the third flow path 7 through the first valve seat 6, and at this time, the seat diameter φA of the first valve seat 6 is set.
The sheet diameter φA is selected so that the desired flow rate Q (L / H) can be obtained.

When a current is supplied to the coil 12 of the electromagnetic device S, the movable core 15 is attracted to the fixed core 14 by the magnetic force and moves upward against the spring force of the spring 16. According to this, the pressure on the first opening / closing valve 8 by the pressing rod 10A is released, so the first opening / closing valve 8 is moved upward by the spring 9 to close the first opening / closing valve 8 or the first valve seat 6, On the other hand, the second opening / closing valve 10 opens the second valve seat 5. According to the above, the fluid in the third flow passage 7 flows into the second flow passage 2 through the second valve seat 5, and at this time, the seat diameter φB of the second valve seat 5 is changed to the first valve seat 6 Although the sheet diameter is smaller than the sheet diameter φA, the desired flow rate Q (L / H) can be obtained. As described above, in the conventional valve seat structure of the three-way valve, when the seat diameters of the first valve seat 6 and the second valve seat 5 are the same seat diameter φA, the first passage 3 to the third passage 3 Since the flow rate X (L / H) of the fluid flowing into the flow channel 7 is larger than the flow rate Y (L / H) of the fluid flowing from the third flow channel 7 into the second flow channel 2, To be understood. As described above, by making the seat diameter φB of the second valve seat 5 smaller than the seat diameter φA of the first valve seat 6, the flow rate of the fluid flowing from the first flow passage 3 into the third flow passage 7, The flow rate of the fluid flowing from the third flow path 7 into the second flow path 2 can be set to a desired flow rate Q (L / H).

Then, as described above, the second valve seat 5
By making the seat diameter φB of the first valve seat 6 smaller than the seat diameter φA of the first valve seat 6, the valve opening force by the fluid acting on the second opening / closing valve 10 can be reduced, and the spring of the spring 16 is thereby reduced. The power could be reduced. According to the above, in the electromagnetic device, the second
It is possible to set the electromagnetic attraction force to the movable core 15 including the on-off valve 10 to be small, and thus the electromagnetic device can be downsized.

[0021]

As described above, according to the valve seat structure of the three-way valve according to the present invention, by making the seat diameter of the second valve seat smaller than the seat diameter of the first valve seat, the fluid pressure to the second opening / closing valve is reduced. It was possible to reduce the valve opening force due to. Therefore, the opening operation force for the second on-off valve can be reduced, and for example, the electromagnetic device in the electromagnetic three-way valve can be downsized, and thus the downsized three-way valve can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a valve seat structure in a three-way valve according to the present invention.

FIG. 2 is a vertical sectional view showing a valve seat structure in a conventional three-way valve.

[Explanation of symbols]

 1 Valve Main Body 2 Second Flow Path 3 First Flow Path 4 Valve Seat Flow Path 4A Other End 4B One End 5 Second Valve Seat 6 First Valve Seat 7 Third Flow Path A First Valve Seat Seat Diameter B Second Valve Seat diameter of seat

Claims (1)

[Claims] 1. The valve body 1 is provided with a valve seat channel 4 having one end 4B opening into the first channel 3 and the other end 4A opening into the second channel 2 and the valve seat channel 4 One end 4B
Forming a first valve seat 6 facing the first flow path 3 and being opened / closed by a first opening / closing valve 8, and facing the second flow path 2 at the other end 4A of the valve seat flow path 4; In a three-way valve in which the second valve seat 5 that is opened and closed by the on-off valve 10 is formed, and the third flow path 7 is opened in the intermediate portion of the valve seat flow path 4,
A valve seat structure of a three-way valve, wherein the seat diameter φB of the second valve seat 5 is smaller than the seat diameter φA of the first valve seat 6.