JP6773483B2 - Three-way valve - Google Patents

Description

The present invention is a three-way valve used as a distribution valve or a mixing valve, more specifically, three ports of the first, second and third ports, adjacent to the axial direction of the first port, and always at the first port. A first valve that moves with respect to a first valve seat having a first opening that communicates the valve chamber and the second port in a valve casing that has a valve chamber that communicates with the valve chamber, and changes the opening degree of the first opening. The present invention relates to a three-way valve in which a body and a second valve body that moves with respect to a second valve seat having a second opening for communicating the valve chamber and the third port to change the opening of the second opening are arranged. ..

In a conventional three-way valve, generally, the axial direction of the first port is the X-axis direction, the direction orthogonal to the X-axis direction is the Y-axis direction, and the first valve seat and the second valve seat are the Y-axis directions of the valve chamber. The first valve body and the second valve body are provided in the valve chamber so that one end and the other end are provided so as to be orthogonal to the Y-axis direction and the operation axis long in the Y-axis direction can be moved forward and backward in the Y-axis direction. The first valve seat and the second valve seat are connected to the operation shaft so as to face each other in the Y-axis direction (see, for example, Patent Document 1). In this case, by moving the operation shaft in one direction in the Y-axis direction, the first valve body approaches the first valve seat, the second valve body separates from the second valve seat, and the opening of the first opening increases. At the same time, the opening of the second opening decreases, and the movement of the operating shaft in the Y-axis direction to the other side causes the first valve body to separate from the first valve seat and the second valve body to approach the second valve seat. As a result, the opening degree of the first opening decreases and the opening degree of the second opening increases.

However, this type requires a feed screw mechanism that converts the rotary motion of the electric motor, which is the drive source of the operating shaft, into the linear motion of the operating shaft, which causes a problem of increasing the cost. Therefore, a three-way valve that does not require a feed screw mechanism is also conventionally known (see, for example, Patent Document 2).

Similar to the conventional three-way valve, this three-way valve is provided with the first valve seat and the second valve seat so as to be orthogonal to the Y-axis direction at one end and the other end of the valve chamber in the Y-axis direction. The operating shaft long in the Y-axis direction is rotatable around the axis, and the first and second valve bodies are connected to the operating shafts and are in contact with the first and second valve seats. It is composed of a plate material that rotates around the axis of the operation shaft. Then, the opening degree of the first opening increases and the opening degree of the second opening decreases due to the rotation of both the first and second valve bodies accompanying the rotation of the operating shaft in either the forward or reverse direction. The opening degree of the first opening decreases and the opening degree of the second opening increases due to the rotation of both the first and second valve bodies accompanying the rotation to the opposite direction.

However, although this does not require a feed screw mechanism, like the conventional three-way valve, the second port is located in a portion separated from the valve chamber located at the same position in the Y-axis direction as the first port. It is necessary to arrange the third port at a portion separated from the valve chamber in the Y-axis direction. Therefore, the dimension of the three-way valve in the Y-axis direction becomes large.

Japanese Unexamined Patent Publication No. 2010-38336 Japanese Unexamined Patent Publication No. 2013-83345

In view of the above points, it is an object of the present invention to provide a small three-way valve having a shortened Y-axis direction dimension.

In order to solve the above problems, the present invention has a valve having three ports of first, second and third, and a valve chamber which is adjacent to the axial direction of the first port and always communicates with the first port. A first valve body that moves with respect to a first valve seat having a first opening that communicates the valve chamber and the second port in the casing to change the opening of the first opening, and a valve chamber and a third. A three-way valve in which a second valve body that moves with respect to a second valve seat having a second opening that communicates with a port and changes the opening of the second opening is arranged, and is a three-way valve with the first valve body. In the second valve body, the opening degree of the first opening increases and the opening degree of the second opening portion increases due to the movement of both the first and second valve bodies due to the rotation of the common operation shaft in the forward and reverse directions. It is configured so that the opening of the first opening decreases and the opening of the second opening increases due to the movement of both the first and second valve bodies as the operating shaft rotates in the forward and reverse directions. The axial direction of the first port is the X-axis direction, the direction orthogonal to the X-axis direction is the Y-axis direction, and the first valve seat is located at one end of the valve chamber in the Y-axis direction in the Y-axis direction. A plate material provided so as to be orthogonal to each other, the operating shaft is longitudinal in the Y-axis direction, and the first valve body is connected to the operating shaft and rotates around the axis of the operating shaft in contact with the first valve seat. The second valve seat is provided on a part of the peripheral surface of the valve chamber along the same direction as the Y-axis direction, and the second valve body is in the same direction as the Y-axis direction from a part of the outer periphery of the first valve body. It is composed of a plate material that extends around the axis of the operation shaft in contact with the second valve seat , the first valve seat is composed of a member separate from the valve casing, and the first valve seat is the Y axis. A spring is provided to urge one direction, and when the first valve body contacts the first valve seat from one side in the Y-axis direction, the spring is compressed, and the compression reaction force of the spring causes the first valve seat and the first valve. and the body, characterized in Rukoto is maintained in pressure contact state.

According to the present invention, since the second valve seat is provided on the peripheral surface portion of the valve chamber along the same direction as the Y-axis direction, the second valve seat communicates with the valve chamber through the second opening formed in the second valve seat. It is possible to arrange the three ports so that at least a part thereof overlaps the valve chamber in the Y-axis direction. Therefore, compared to the conventional three-way valve in which the third port must be arranged in a portion distant from the valve chamber in the Y-axis direction, the Y-axis direction dimension is shortened to reduce the size of the three-way valve. be able to.

In particular, if the third port is provided at the same position as the first port in the Y-axis direction and the axis of the third port is orthogonal to the same direction as the Y-axis direction, the Y-axis direction dimension of the three-way valve is possible. Can be shortened to.

The cut side view of the three-way valve of embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. The perspective view of the disassembled state of the main part of the three-way valve of an embodiment.

With reference to FIG. 1, in the water heater having the heat exchanger a, the three-way valve A according to the embodiment of the present invention has a bypass water channel c and a heat exchanger a in which water from the water supply channel b is parallel to the heat exchanger a. It is used as a distribution valve that distributes to the heat exchange water channel d connected to. The three-way valve A has an axial direction of the first port 11 connecting the water supply channel b, the second port 12 connecting the bypass water channel c, the third port 13 connecting the heat exchange water channel d, and the first port 11. A valve casing 1 having a valve chamber 14 that is adjacent to the first port 11 and is always connected to the first port 11 is provided.

In the valve casing 1, the first opening 15a moves with respect to the first valve seat 15 having the first opening 15a (see FIGS. 2 and 3) that communicates the valve chamber 14 and the second port 12. The opening degree of the second opening portion 16a is increased by moving with respect to the second valve seat 16 having the first valve body 2 having a variable opening degree and the second opening portion 16a communicating the valve chamber 14 and the third port 13. A variable second valve body 3 and a common operating shaft 4 for moving both the first and second valve bodies 2 and 3 are arranged.

Hereinafter, the axial direction of the first port 11 is the X-axis direction, and the direction orthogonal to the X-axis direction is the Y-axis direction, the first and second valve seats 15 and 16, and the first and second valve bodies. 2 and 3 and the operation shaft 4 will be described in detail with reference to FIGS. 2 and 3.

The first valve seat 15 is provided at one end of the valve chamber 14 in the Y-axis direction (to the right in FIG. 1) so as to be orthogonal to the Y-axis direction. In the present embodiment, the first valve seat 15 is composed of a member separate from the valve casing 1. Then, the support cylinder 171 extending in one Y-axis direction protruding from the plug 17 mounted on the other end in the Y-axis direction of the valve chamber 14 extends to the other end in the Y-axis direction protruding from the first valve seat 15. The shaft portion 151 is inserted to support the first valve seat 15 in the valve casing 1. A ridge 151a long in the Y-axis direction that bulges outward in the radial direction is provided on a part of the peripheral surface of the shaft portion 151 in order to prevent the first valve seat 15 from rotating with respect to the support cylinder 171. .. Further, the first valve seat 15 is urged in one direction in the Y-axis direction by a spring 152 in the support cylinder 171 and a claw portion 151b provided at the other end in the Y-axis direction of the ridge 151a is formed in the support cylinder 171. The first valve seat 15 is prevented from coming off from the support cylinder 171 by being inserted into the slit 171a and engaging the claw portion 151b with one end edge of the slit 171a in the Y-axis direction.

The operation shaft 4 is longitudinal in the Y-axis direction and is rotationally driven by an electric motor 5 arranged at one end of the valve casing 1 in the Y-axis direction. The first valve body 2 is made of a plate material that is connected to the other end of the operation shaft 4 in the Y-axis direction and rotates around the axis of the operation shaft 4 in contact with the first valve seat 15. In this embodiment, the first valve body 2 is integrally molded with the operation shaft 4. The first valve seat 15 is provided with a pair of first openings 15a so as to be point-symmetric with respect to the axis of the operation shaft 4, and the first valve body 2 has a size equal to or larger than the first opening 15a. The valve openings 2a of the above are opened in pairs so as to be point-symmetric with respect to the axis of the operation shaft 4. Then, the first valve body 2 is in a fully open state of the first opening 15a shown in FIG. 2 in which the entire first opening 15a is accommodated in each valve opening 2a, and each valve opening 2a is from each first opening 15a. It is designed to rotate between the fully closed state of the first opening 15a, which is completely disengaged and rotated 90 ° clockwise from the fully open state.

The outer diameter of the first valve seat 15 is smaller than the diameter of the valve chamber 14, and the outer diameter of the first valve seat 15 is located on the outer peripheral portion of the first valve body 2 between the outer peripheral surface of the first valve seat 15 and the peripheral wall surface of the valve chamber 14. An annular protrusion 21 that enters the gap is provided. Further, the valve casing 1 is positioned at one end of the valve chamber 14 in the Y-axis direction to form an annular step portion 18 projecting inward in the radial direction so as to face one end in the Y-axis direction of the first valve body 2. The shoulder portion 22 provided on the outer periphery of the surface is brought into contact with the step portion 18 via the seal ring 23. By this contact, the first valve seat 15 is pushed to the other side in the Y-axis direction via the first valve body 2, the spring 152 is compressed, and the compression reaction force of the spring 152 causes the first valve seat 15 and the first valve. The body 2 is maintained in a pressure contact state.

Further, the second valve seat 16 is provided on a part of the peripheral surface of the valve chamber 14 along the same direction as the Y-axis direction. The second valve seat 16 is provided with a second opening 16a at a position equivalent to that of the first port 11 in the Y-axis direction. Then, the third port 13 is provided at a position equivalent to the first port 11 in the Y-axis direction so that the axis of the third port 13 is orthogonal to the same direction as the Y-axis direction. Here, the above-mentioned "direction equivalent to the Y-axis direction" includes not only a direction that completely matches the Y-axis direction but also a direction that is slightly inclined with respect to the Y-axis direction. In the present embodiment, the third port 13 is provided so that its axis line is along the X-axis direction, but the axis line intersects the X-axis direction, for example, along the direction orthogonal to the paper surface of FIG. It is also possible to provide the third port 13.

The second valve body 3 extends from a part of the outer circumference of the first valve body 2, that is, a part of the annular protrusion 21 in the same direction as the Y-axis direction, and is in contact with the second valve seat 16. It is composed of a tongue piece-shaped plate material integrated with the first valve body 2 that swivels around the axis of 4. Then, in the fully open state of the first opening 15a shown in FIG. 2, the opening of the second opening 16a is minimized when the second valve body 3 faces the second opening 16a, and 90 in the clockwise direction from this state. When the first opening 15a is fully closed by rotating °, the second valve body 3 is completely separated from the second opening 16a so that the second opening 16a is fully opened.

As a result, when the operation shaft 4 is rotated clockwise from the fully open state of the first opening 15a shown in FIG. 2, the first opening is rotated clockwise by the rotation of both the first and second valve bodies 2 and 3. As the opening degree of the first opening 15a decreases, the opening degree of the second opening 16a increases, the distribution ratio to the bypass channel c decreases, and the operation shaft 4 is rotated counterclockwise from the fully closed state of the first opening 15a. When rotated, the opening of the first opening 15a increases and the opening of the second opening 16a decreases due to the clockwise rotation of both the first and second valve bodies 3 and 3, and the bypass channel The distribution ratio to c increases. The size of the second valve body 3 is made smaller than the size of the second opening 16a so that the second opening 16a is not completely closed in the minimum opening state of the second opening 16a. This is because even a small amount of water is passed through the heat exchange channel d to suppress a sharp increase in the distribution ratio to the bypass channel c. Of course, it is also possible to make the second opening 16a fully closed while the first opening 15a is fully open.

If the second valve seat 16 is provided on the peripheral surface portion of the valve chamber 14 along the same direction as the Y-axis direction as described above, the second valve seat 16 communicates with the valve chamber 14 via the second opening 16a formed in the second valve seat 16. The third port 13 can be arranged so that at least a part thereof overlaps the valve chamber 14 in the Y-axis direction. Therefore, as compared with the conventional three-way valve in which the third port 13 must be arranged at a portion distant from the valve chamber 14 in the Y-axis direction, the Y-axis direction dimension is shortened and the three-way valve is downsized. Can be planned.

In particular, as in the present embodiment, if the third port 13 is provided at the same position as the first port 11 in the Y-axis direction and the axis of the third port 13 is orthogonal to the same direction as the Y-axis direction, a three-way valve is provided. The Y-axis direction dimension can be shortened as much as possible.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, the three-way valve A of the above embodiment is used as a distribution valve, but is a mixing valve that allows two types of fluids to flow in from the second port 12 and the third port 13 and flows out from the first port 11. The present invention can be similarly applied to the three-way valve used as the

1 ... Valve casing, 11 ... 1st port, 12 ... 2nd port, 13 ... 3rd port, 14 ... Valve chamber, 15 ... 1st valve seat, 15a ... 1st opening, 16 ... 2nd valve seat, 16a ... 2nd opening, 2 ... 1st valve body, 3 ... 2nd valve body, 4 ... Operating shaft.

Claims (2)

The valve chamber and the second port are arranged in a valve casing having three ports of the first, second and third ports, and a valve chamber that is adjacent to the axis direction of the first port and always communicates with the first port. A first valve body that moves with respect to a first valve seat having a first opening to communicate with and changes the opening degree of the first opening, and a second opening having a second opening that communicates between the valve chamber and the third port. It is a three-way valve in which a second valve body that moves with respect to the two valve seats and changes the opening degree of the second opening is arranged.
In the first valve body and the second valve body, the opening of the first opening increases and the second opening increases due to the movement of both the first and second valve bodies due to the rotation of the common operating shaft in the forward and reverse directions. The opening degree of the portion decreases, and the opening degree of the first opening portion decreases and the opening degree of the second opening portion increases due to the movement of both the first and second valve bodies due to the rotation of the operation shaft to the opposite direction. In what is configured to increase
The axial direction of the first port is the X-axis direction, the direction orthogonal to the X-axis direction is the Y-axis direction, and the first valve seat is provided at one end of the valve chamber in the Y-axis direction so as to be orthogonal to the Y-axis direction. The operating shaft is longitudinal in the Y-axis direction, and the first valve body is made of a plate material that is connected to the operating shaft and rotates around the axis of the operating shaft in contact with the first valve seat. The valve seat is provided on a part of the peripheral surface of the valve chamber along the same direction as the Y-axis direction, and the second valve body extends from a part of the outer periphery of the first valve body in the same direction as the Y-axis direction. 2 Consists of a plate material that swivels around the axis of the operating shaft while in contact with the valve seat .
The first valve seat is composed of a member separate from the valve casing, is provided with a spring that urges the first valve seat in one direction in the Y-axis direction, and the first valve body is attached to the first valve seat from one side in the Y-axis direction. abutting a spring is compressed by, the three-way valve in which the first valve seat by the compression reaction force of the spring and the first valve body and said Rukoto is maintained in pressure contact state. The three-way valve according to claim 1, wherein the third port is provided at a position equivalent to the first port in the Y-axis direction so that the axis of the third port is orthogonal to the same direction as the Y-axis direction.

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