JP2018080713A - Three-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a dimension in a Y-axis direction orthogonal to an X-axis direction as an axial direction of a first port, in a three-way valve including a first valve element 2 moving to a first valve seat 15 having a first opening portion 15a for communicating a valve chest 14 constantly communicated to the first port 11 and a second port 12, and a second valve element 3 moving to a second valve seat 16 having a second opening portion 16a for communicating the valve chest 14 and a third port 13.SOLUTION: One of first and second valve seats, for example, the second valve seat 16 is disposed on a part of a peripheral face along a Y-axis direction of a valve chest 14, and a third port 13 may be disposed in a state of being overlapped to the valve chest 14 in the Y-axis direction. A second valve element 3 is connected to a rotated and driven operation shaft 4 longitudinal in the Y-axis direction so that it is rotated around an axis of the operation shaft 4 in a state of being kept into contact with the second valve seat 16.SELECTED DRAWING: Figure 1

Description

  In the valve casing having the first, second, and third ports, and the valve chamber that is adjacent to the first port in the axial direction and always communicates with the first port. A first valve body that moves relative to a first valve seat having a first opening that communicates with the two ports to vary the opening of the first opening, and a second opening that communicates the valve chamber and the third port The present invention relates to a three-way valve used as a distribution valve or a mixing valve in which a second valve body that moves relative to a second valve seat having a portion and changes the opening degree of a second opening is arranged.

  In the 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 direction of the valve chamber. The first valve body and the second valve body are provided in one end and the other end so as to be orthogonal to the Y-axis direction, and an operation shaft that is long in the Y-axis direction can be advanced and retracted in the Y-axis direction. The first and second valve seats 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, when the operating shaft moves in one direction in the Y-axis direction, the first valve body approaches the first valve seat, the second valve body is separated from the second valve seat, and the opening degree of the first opening decreases. In addition, the opening of the second opening increases, and the movement of the operating shaft to the other side in the Y-axis direction causes the first valve body to move away from the first valve seat and the second valve body to approach the second valve seat. Then, the opening degree of the first opening portion increases and the opening degree of the second opening portion decreases.

  However, this requires a feed screw mechanism that converts the rotational motion of the electric motor, which is the drive source of the operating shaft, into the linear motion of the operating shaft, leading to an increase in cost. Thus, a three-way valve that does not require a feed screw mechanism is also known in the art (see, for example, Patent Document 2).

  Like the conventional three-way valve, this three-way valve is provided with the first valve seat and the second valve seat at one end and the other end in the Y-axis direction of the valve chamber so as to be orthogonal to the Y-axis direction. The operation shaft that is long in the Y-axis direction is rotatable about its axis, and the first and second valve bodies are connected to the operation shaft and in contact with the first and second valve seats, respectively. It consists of a plate that rotates around the axis of the operating shaft. The opening of the first opening is increased and the opening of the second opening is decreased by the rotation of both the first and second valve bodies accompanying the rotation of the operation shaft in the forward and reverse directions. The opening of the first opening is decreased and the opening of the second opening is increased by the rotation of both the first and second valve bodies accompanying the rotation in the forward and reverse directions.

  However, in this case, although the feed screw mechanism is not required, the second port is located at a position away from the valve chamber located at the same position as the first port in the Y-axis direction, as in the conventional three-way valve. In addition, it is necessary to dispose the third port in a portion away from the valve chamber to the other side in the Y-axis direction. Therefore, the Y-axis direction dimension of the three-way valve becomes large.

JP 2010-38336 A JP2013-83345A

  This invention makes it the subject to provide the small three-way valve which shortened the dimension of the Y-axis direction in view of the above point.

  In order to solve the above-described problems, the present invention provides a valve having first, second, and third three ports, and a valve chamber that is adjacent to the first port in the axial direction and always communicates with the first port. A first valve body that moves relative to a first valve seat having a first opening communicating with the valve chamber and the second port in the casing to vary the opening of the first opening, 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 communicating with the port and changes the opening degree of the second opening is disposed, the axis of the first port The first valve body and the second valve body are rotated in accordance with the rotation of the common operation shaft that is long in the Y-axis direction in the forward and reverse directions, where the direction is the X-axis direction and the direction orthogonal to the X-axis direction is the Y-axis direction. The opening of the first opening is increased by the movement of both the first and second valve bodies and the opening of the second opening is decreased. The opening of the first opening is decreased and the opening of the second opening is increased by the movement of both valve bodies, and one of the first valve seat and the second valve seat is The valve seat is configured by a valve seat provided on a part of the circumferential surface along the same direction as the Y-axis direction of the valve chamber, and having a cross-sectional shape orthogonal to the Y-axis direction and an arcuate curved surface. One valve body that moves relative to one valve seat of the one valve body and the second valve body has a curved surface with an arc-shaped cross section perpendicular to the same direction as the Y-axis direction. It is characterized by comprising a valve body connected to the operation shaft so as to turn around the axis of the operation shaft in contact with the valve seat.

  According to the present invention, since one of the first valve seat and the second valve seat is provided on the peripheral surface portion along the same direction as the Y-axis direction of the valve chamber, the second port, the third port, It is possible to arrange one port communicating with the valve chamber through an opening formed in one valve seat so that at least a part of the port overlaps the valve chamber in the Y-axis direction. Therefore, compared with the three-way valve of the conventional example, in which the second port and the third port have to be arranged at portions separated from each other in the Y-axis direction with respect to the valve chamber, respectively, the Y-axis direction dimension is shortened, The three-way valve can be downsized.

  In particular, if the one port is provided at the same position as the first port in the Y-axis direction so that the axis of the one port is perpendicular to the same direction as the Y-axis direction, the three-way valve can be dimensioned in the Y-axis direction. It can be shortened as much as possible and is advantageous.

  Further, in the present invention, when the one valve seat is provided in a portion located on the opposite side to the first port on the circumferential surface of the valve chamber in the X-axis direction, it matches the axis of the operation shaft of the valve chamber. It is desirable to make the distance from the center position to the curved surface of one valve seat shorter than the distance from the center position to the communication port. According to this, even if the one valve body turns 180 ° from the closed position, a gap is secured between the communication port and the one valve body, and the fluid flows into the valve chamber from the first port. Therefore, the distribution ratio (when a three-way valve is used as a distribution valve) and the mixing ratio (when a three-way valve is used as a mixing valve) can be designed to gradually vary within the 180 ° rotation range of the operating shaft. The resolution of mixing ratio adjustment is improved.

The cutting | disconnection side view of the three-way valve of 1st Embodiment of this invention. Sectional drawing cut | disconnected by the II-II line | wire of FIG. Sectional drawing cut | disconnected by the III-III line | wire of FIG. The figure which shows the positional relationship of the 2nd valve body with respect to the 2nd valve seat in the closed position of the 2nd valve body seen from the arrow IV direction of FIG. The disassembled perspective view of the principal part of the three-way valve of 1st Embodiment. The cutaway side view of the three-way valve of 2nd Embodiment of this invention. Sectional drawing cut | disconnected by the VII-VII line of FIG. The disassembled perspective view of the principal part of the three-way valve of 2nd Embodiment.

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

  In the valve casing 1, a first valve that moves relative to a first valve seat 15 having a first opening 15 a that communicates the valve chamber 14 and the second port 12 to vary the opening of the first opening 15 a. The second valve body 3 which moves relative to the body 2, the second valve seat 16 having the second opening 16a communicating with the valve chamber 14 and the third port 13, and changes the opening of the second opening 16a. A common operation shaft 4 for moving both the first and second valve bodies 2 and 3 is disposed.

  Hereinafter, each of the first and second valve seats is defined by assuming that the axial direction (vertical direction in FIG. 1) of the first port 11 is the X-axis direction and the direction orthogonal to the X-axis direction (left-right direction in FIG. 1) is the Y-axis direction. The first and second valve bodies 2 and 3 and the operation shaft 4 will be described in detail with reference to FIGS.

  The operation shaft 4 is long in the Y-axis direction. Further, an electric motor 5 composed of a stepping motor is disposed on the outer surface of one end of the valve casing 1 in the Y-axis direction (right side in FIG. 1). Then, one end of the operation shaft 4 in the Y-axis direction is connected to the electric motor 5 through a through hole 17 formed in one end of the valve casing 1 in the Y-axis direction. An O-ring 41 that is a seal member for preventing water leakage from the through hole 17 is attached to the portion of the operation shaft 4 that is inserted through the through hole 17. Further, the valve casing 1 includes a plug body 18 attached to the other end (left side in FIG. 1) in the Y-axis direction of the valve chamber 14, and an operation shaft is provided in a support hole 19 formed in the plug body 18. The other end in the Y-axis direction of 4 is inserted and supported.

  The first valve seat 15 is provided at one end of the valve chamber 14 in the Y-axis direction so as to be orthogonal to the Y-axis direction. The direction from the valve chamber 14 toward the first port 11 is one side in the X-axis direction, and one half of the first valve seat 15 is positioned outside the central hole 15b through which the operation shaft 4 is inserted. Thus, as shown in FIGS. 2 and 5, a circular arc-shaped first opening 15 a is formed over a half circumference. In the present embodiment, the first valve seat 15 is constituted by a member separate from the main body of the valve casing 1, but the first valve seat 15 may be integrally formed with the main body of the valve casing 1. It is.

  The first valve body 2 is configured by a fan-shaped plate member connected to the operation shaft 4 so as to rotate around the axis of the operation shaft 4 in a state in contact with the other surface in the Y-axis direction of the first valve seat 15. . And the 1st valve body 2 is the operating shaft 4 between the open position which makes the 1st opening part 15a a full open state, and the closed position which rotated 180 degrees from the fully open position and makes the 1st opening part 15a a full closed state. Rotate forward and backward in one and the other. In the present embodiment, the first valve body 2 is integrally formed with the operation shaft 4. However, a separate first valve body may be connected to the operation shaft 4.

  3 to 5, the second valve seat 16 is a part of the circumferential surface along the same direction as the Y-axis direction of the valve chamber 14, more specifically, the first port on the circumferential surface of the valve chamber 14. 11, the cross-sectional shape orthogonal to the Y-axis direction is provided in a portion (a portion 180 degrees away from the communication port 11a in the circumferential direction) located on the opposite side to the communication port 11a with respect to the X-axis direction. It consists of a valve seat with a face. The second valve seat 16 is provided with a second opening 16a at the same position as the first port 11 in the Y-axis direction. The third port 13 is provided at the same position as 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 “direction equivalent to the Y-axis direction” includes not only a direction completely matching the Y-axis direction but also a direction slightly inclined with respect to the Y-axis direction. In the present embodiment, the second valve seat 16 is integrally formed with the plug body 18, but the second valve seat 16 may be integrally formed with the main body of the valve casing 1. Further, the plug body 18 is provided with an end plate portion 18a that is located at one end portion in the Y-axis direction of the second valve seat 16 and faces the first valve seat 15 with the first valve body 2 interposed therebetween. The end plate portion 18a is formed with a hole 18b through which the second valve body 3 and the operation shaft 4 can be inserted.

  The second valve body 3 has an arcuate curved surface whose cross-sectional shape is perpendicular to the Y-axis direction, and is operated so as to turn around the axis of the operation shaft 4 in a state where the curved surface is in contact with the second valve seat 16. The valve body is connected to the shaft 4. And in the open position of the 1st valve body 2, the 2nd valve body 3 exists in the closed position which makes the opening degree of the 2nd opening part 16a the minimum, and in the closed position of the 1st valve body 2, the 2nd valve body 3 exists in the open position which makes the 2nd opening part 16a a full open state. Accordingly, the operation shaft 4 is rotated in the forward direction (counterclockwise in FIGS. 2 and 3) from the state where the first valve body 2 is in the closed position and the second valve body 3 is in the open position (the state shown in FIGS. 2 and 3). ), The opening of the first opening 15a increases and the opening of the second opening 16a decreases, the distribution ratio to the bypass channel c increases, and the first valve body 2 opens. When the operating shaft 4 is rotated in the reverse direction (clockwise in FIGS. 2 and 3) from the state where the second valve body 3 is in the closed position, the opening of the first opening 15a is reduced and the second opening The opening degree of 16a increases and the distribution ratio to the bypass channel c decreases.

  In the present embodiment, the second opening 16a is not completely closed at the closed position of the second valve body 3, but this allows even a small amount of water to pass through the heat exchange water channel d to the bypass water channel c. This is to suppress a rapid increase in the distribution ratio. Of course, the second opening 16a can be fully closed at the closed position of the second valve body 3. In the present embodiment, the second valve body 3 is integrally formed with the operation shaft 4, but a second valve body that is a separate body may be connected to the operation shaft 4.

  Here, the distance L1 from the center position matching the axis of the operation shaft 4 of the valve chamber 14 to the curved surface of the second valve seat 16 is shorter than the distance L2 from the center position to the communication port 11a. Therefore, even if the second valve body 3 rotates 180 ° from the closed position to the open position, a gap is secured between the communication port 11a and the second valve body 3, and fluid flows from the first port 11 to the valve chamber 14. Flows in. Therefore, it can be designed so that the distribution ratio to the bypass channel c gradually changes in the 180 ° rotation range of the operation shaft 4, and the resolution of the distribution ratio adjustment is improved. Moreover, in this embodiment, while forming the half part by the side of the reverse rotation direction of the 1st opening part 15a in a taper shape, the Y-axis direction other side edge of the 2nd valve body 3 and the 2nd opening part 16a is a normal rotation direction. The resolution of the distribution ratio adjustment can be further improved by inclining in one direction in the Y axis direction.

  In the present embodiment, the second valve seat 16 is provided on the peripheral surface portion of the valve chamber 14 that is 180 ° away from the communication port 11a in the circumferential direction, but the angle other than 180 ° in the circumferential direction from the communication port 11a, For example, it is possible to provide the second valve seat 16 on the peripheral surface portion of the valve chamber 14 that is 90 ° apart. In this case, the distance from the center position of the valve chamber 14 to the curved surface of the second valve seat 16 may not be shorter than the distance from the center position to the communication port 11a.

  As described above, if the second valve seat 16 is provided on the peripheral surface portion along the same direction as the Y-axis direction of the valve chamber 14, it communicates with the valve chamber 14 through the second opening 16 a formed in the second valve seat 16. Thus, 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 the other side away 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 achieved. In particular, as in this embodiment, if the third port 13 is provided at the same position as 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, the three-way valve The dimension in the Y-axis direction can be shortened as much as possible.

  Next, a second embodiment shown in FIGS. 6 to 8 will be described. The difference of the second embodiment from the first embodiment is the structure of the first valve seat 15 and the first valve body 2. That is, in the second embodiment, the valve chamber 14 is provided with an extension chamber 14a extending in one direction in the Y-axis direction. The first valve seat 15 is a valve seat that is provided on a part of the circumferential surface along the same direction as the Y-axis direction of the extension chamber 14a and has a curved surface with an arcuate cross section perpendicular to the Y-axis direction. Is configured. In addition, the first valve body 2 has a curved surface with an arc-shaped cross section perpendicular to the Y-axis direction, and the curved surface is in contact with the first valve seat 15 around the axis of the operation shaft 4. It is comprised with the valve body connected with the operating shaft 4 so that it may turn. And in the open position of the 2nd valve body 3 of the structure similar to 1st Embodiment, the 1st valve body 2 exists in the closed position which makes the 1st opening part 15a a full closed state, In the closed position, the first valve body 2 is in an open position that fully opens the first opening 15a.

  Even in the second embodiment, the positional relationship of the second and third ports 12 and 13 in the Y-axis direction with respect to the first port 11 is the same as that in the first embodiment, and the dimensions of the three-way valve in the Y-axis direction are the same. Can be shortened.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, the third port 13, the second valve seat 16 and the second valve body 3 of the above embodiment are replaced with the second port, the first valve seat and the first valve body, and the second port 12 of the above embodiment, It is also possible to constitute a three-way valve in which the first valve seat 15 and the first valve body 2 are replaced with a third port, a second valve seat and a second valve body. In addition, the three-way valve A of the above embodiment is used as a distribution valve, but a mixing valve that allows two types of fluid to flow in from the second port 12 and the third port 13 and flows out of the mixed fluid from the first port 11. The present invention can be applied to a three-way valve used as

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

Claims (3)

The valve chamber and the second port are disposed in a valve casing having first, second and third three ports, and a valve chamber which is adjacent to the first port in the axial direction and is always in communication with the first port. A first valve body that moves relative to a first valve seat having a first opening that communicates to vary the opening of the first opening, and a second opening that communicates the valve chamber and the third port. A three-way valve arranged with a second valve body that moves relative to the two valve seats and varies the opening of the second opening,
The axial direction of the first port is the X-axis direction, and the direction perpendicular to the X-axis direction is the Y-axis direction. The opening of the first opening increases and the opening of the second opening decreases due to the movement of the first and second valve bodies accompanying the rotation of the first valve, and the second opening decreases as the operating shaft rotates in the opposite direction. In the configuration in which the opening of the first opening is decreased and the opening of the second opening is increased by the movement of both the first and second valve bodies,
One of the first valve seat and the second valve seat has a cross-sectional shape that is provided in a part of the circumferential surface along the same direction as the Y-axis direction of the valve chamber and is orthogonal to the same direction as the Y-axis direction. A cross section of one valve body that is composed of a valve seat having an arcuate curved surface and moves relative to one of the first valve body and the second valve body is orthogonal to the Y-axis direction. Has a circular arc-shaped curved surface, and is composed of a valve body connected to the operation shaft so as to turn around the axis of the operation shaft in a state where the curved surface is in contact with one valve seat. valve.   One port communicating with the valve chamber through an opening formed in the one valve seat among the second port and the third port is located at the same position as the first port in the Y-axis direction. The three-way valve according to claim 1, wherein the port axis is provided so as to be orthogonal to a direction equivalent to the Y-axis direction. The three-way valve according to claim 1 or 2, wherein the one valve seat is provided in a portion located on the opposite side to the communication port with respect to the first port on the peripheral surface of the valve chamber in the X-axis direction. The three-way valve, wherein a distance from a central position that matches the axis of the operation axis of the chamber to a curved surface of one of the valve seats is shorter than a distance from the central position to the communication port.

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