JP2020159441A - Three-way valve - Google Patents

Abstract

To provide a three-way valve that can suppress increase in passage resistance in a valve body due to reduction in diameter of the valve body, and can prevent seal failure of each radial port due to deflection of a peripheral wall part of the valve body facing each radial port.SOLUTION: A valve body 2 is provided with a reinforcing rib 25 extending in an axial direction along a diameter direction of the valve body passing through a circumferential middle part of a valve opening 22. Also, the portion of the peripheral wall part of the valve body adjacent to one end side in the axial direction of the valve opening 22 is cut out except for a peripheral wall portion 21a in a predetermined circumferential range narrower than the circumferential range of the valve opening 22 and centered on the reinforcing rib 25.SELECTED DRAWING: Figure 5

Description

In the present invention, a valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and a pair of first and second openings opened at two locations in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a radial port and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one axial end of the valve body is an internal space of the valve body and an axial port. A single valve opening is formed on the peripheral wall of the valve body so that the internal space of the valve body and the first and second radial ports can be communicated with each other by the rotation of the valve body. Regarding the three-way valve.

In this type of three-way valve, when the peripheral wall portion of the circumferential portion where the valve opening does not exist faces the first and second radial ports and closes each of these radial ports, it becomes each radial port. The portions of the facing peripheral walls may be pushed by the fluid pressure of each radial port and flex inward in the radial direction, resulting in poor sealing of each radial port.

Therefore, conventionally, it is known that the valve body is provided with reinforcing ribs extending in the axial direction along the diameter direction of the valve body passing through the circumferential intermediate portion of the valve opening (see, for example, Patent Document 1). .. According to this, the bending of the peripheral wall portion facing each radial port can be prevented by the reinforcing rib, and the sealing failure of each radial port can be prevented.

By the way, recently, in order to reduce the size of the three-way valve, it is desired to reduce the diameter of the valve body. However, if the diameter of the valve body is reduced, the passage resistance in the valve body increases. Therefore, in order to reduce the diameter of the valve body, it is necessary to suppress an increase in passage resistance in the valve body.

Japanese Unexamined Patent Publication No. 2010-1925

In view of the above points, it is an object of the present invention to provide a three-way valve capable of suppressing an increase in passage resistance in the valve body due to a small diameter of the valve body.

In order to solve the above problems, the present invention opens a valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and two openings in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a pair of first and second radial ports and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one end in the axial direction of the valve body is a valve body. The internal space of the valve body and the axial port are opened so as to always communicate with each other, and the internal space of the valve body and the first and second radial ports can be communicated with the peripheral wall portion of the valve body by rotating the valve body. In a three-way valve in which a single valve opening is formed, the valve body is provided with reinforcing ribs extending axially along the radial direction of the valve body passing through the circumferential middle portion of the valve opening, and the valve opening The portion of the peripheral wall of the valve body adjacent to one end side in the axial direction is cut out except for the peripheral wall portion of the predetermined circumferential range centered on the reinforcing rib, which is narrower than the circumferential range of the valve opening. It is a feature.

According to the present invention, in a portion of the valve body in which the peripheral wall portion adjacent to one end side in the axial direction (that is, the axial port side) is cut out, a passage between the valve body and the axial port portion by the thickness of the peripheral wall portion. The area becomes large. Therefore, it is possible to suppress an increase in passage resistance in the valve body due to the reduction in the diameter of the valve body. When the peripheral wall portion of the circumferential portion where the valve opening does not exist faces the first and second radial ports, the fluid pressure of each radial port acting on the peripheral wall portion is a reinforcing rib. It can be received at the peripheral wall portion left in a predetermined circumferential range centered on the reinforcing rib. Therefore, even if the peripheral wall portion adjacent to one end side in the axial direction of the valve opening of the valve body is cut out except for the above-mentioned circumferential direction range, the peripheral wall portion facing each radial port does not bend, and each It is possible to prevent defective sealing of the radial port.

The cut side view of the three-way valve of embodiment of this invention. The cut plan view cut by II-II of FIG. The perspective view of the packing and the packing mounting member provided in the three-way valve of the embodiment. The perspective view of the state in which the upper half part of the valve casing provided in the three-way valve of an embodiment is cut off. The perspective view of the valve body provided in the three-way valve of an embodiment.

The three-way valve of the embodiment of the present invention shown in FIGS. 1 and 2 has a valve chamber 11 having a cylindrical peripheral surface and an axial port 12 communicating with one axial end (lower end of FIG. 1) of the valve chamber 11. , and a valve housing 1 having a first and a ₂ second pair of radial ports 13 _1, 13 which is open in the circumferential direction two portions of the circumferential surface of the valve chamber 11. Incidentally, the three-way valve switches the mixing ratio of the first fluid and the second fluid flow from the second radial port 13 ₂ axially port 12 to flow from the first radial port 13 ₁ in the axial direction port 12 mixing valve, or is to use as a distribution valve for switching the distribution ratio of the first radial port 13 ₁ of the fluid flowing axially port 12 and the second radial port 13 _2.

The three-way valve further includes a valve body 2 having a cylindrical peripheral wall portion 21 rotatably provided in the valve chamber 11. One end of the valve body 2 in the axial direction is open so as to always communicate with the internal space of the valve body 2 and the axial port 12. Further, the peripheral wall 21 of the valve body 2, the interior space and first and second respective radial ports 13 _1, 13 ₂ and communicable a single valve opening in the valve body 2 by the rotation of the valve body 2 22 is formed. A valve shaft 23 is erected on the end wall of the other end of the valve body 2 in the axial direction. Then, the valve shaft 23 is connected to the motor 3 mounted on the outer surface of the valve housing 1, and the valve body 2 is rotated by the motor 3.

Further, as shown in FIG. 5, a stopper protrusion 24 is inserted into an arcuate groove 14 formed on the other end surface of the valve chamber 11 in the axial direction at one location on the outer peripheral portion of the end wall at the other end in the axial direction of the valve body 2. Is projected. The rotation range of the valve body 2 is limited by the stopper protrusions 24 contacting both ends of the arcuate groove 14.

Around the open end with respect to the first and second respective radial ports 13 _1, 13 ₂ of the valve chamber 11, an annular packing mounting groove 4 is provided. An annular packing 5 in contact with the outer peripheral surface of the peripheral wall portion 21 of the valve body 2 is mounted in each packing mounting groove 4. Each packing mounting groove 4 and each packing 5 has an annular shape as seen from the valve chamber 11 side.

Further, in the present embodiment, the outer peripheral side groove wall 41 of each packing mounting groove 4 is integrally formed with the valve housing 1. On the other hand, receives an inner circumferential side groove wall 42 of the packing mounting groove 4 surrounding the open end, the valve chamber 11 side opposite to the base end portion 51 of the gasket 5 with respect to each radial port 13 _1, 13 ₂ of the valve chamber 11 the bottom wall 43 of each packing mounting groove 4, the valve housing 1 separately, are formed in each packing mounting member 6 of an annular that is fitted and fixed to the valve housing 1 in each radial port 13 _1, 13 ₂ ing.

With reference to FIG. 3, at four locations in the circumferential direction of the tubular portion 61 extending outward from the portion of each packing mounting member 6 serving as the bottom wall 43, claw portions 62 elastically deformable in the radial direction of the tubular portion 61 Is provided. Further, as shown in FIG. 4, the peripheral surface of each radial port ₁₃ 1, 13 _2, grooves 131 corresponding to the respective claw portions 62 are formed. Then, in a state in which each gasket 5 in the circumferential groove wall 42 within which is formed in each packing mounting member 6 was fitted to, when inserted from the outside of each packing mounting member 6 on each radial port 13 _1, 13 ₂ , where each packing mounting member 6 has reached a predetermined set position, the pawl portions 62 are engaged enters elastically in the groove 131, in each packing mounting members 6 each radial port 13 _1, 13 ₂ It is fitted and fixed to the valve housing 1.

The base end portion 51 of each packing 5 is formed in a flange shape that bends toward the outer peripheral side. Further, on the outer periphery of the radial ports 13 _1, 13 _2, by positioning the proximal end of the portion to be the outer periphery side groove wall 41 of the packing mounting groove 4, to form a step 132 that faces outward. When each packing mounting member 6 reaches the set position, the flange-shaped base end portion 51 of each packing 5 is sandwiched between the step 132 and the bottom wall 43.

Further, a ridge 63 is provided at a diagonal position on the outer surface of the tip end portion of the tubular portion 61 of each packing mounting member 6. On the other hand, the diagonal positions of the peripheral surface of the radial port ₁₃ 1, 13 _2, a groove portion 133 projecting 63 extending in the longitudinal direction of the engageable radial ports ₁₃ 1, 13 ₂ are formed .. Then, each packing mounting member 6 is phase-determined by engaging the protrusion 63 with the groove portion 133.

Incidentally, the peripheral wall portion 21 first and second respective radial directions ports ₁₃ 1, 13 ₂ opposed to each radial port ₁₃ 1 of the circumferential portion of the valve opening 22 of the valve element 2 does not exist, 13 ₂ a closed when, each radial port 13 _1, 13 ₂ opposing portions of the peripheral wall portion 21 is pushed to the fluid pressure of each radial port 13 _1, 13 ₂ flexes radially inward, each radial port 13 _1, 13 is likely to produce a _second seal failure. Further, if the diameter of the valve body 2 is reduced in order to reduce the size of the valve, the passage resistance in the valve body 2 increases.

Therefore, in the present embodiment, as clearly shown in FIG. 5, the valve body 2 is provided with a reinforcing rib 25 extending in the axial direction along the diameter direction of the valve body 2 passing through the circumferential intermediate portion of the valve opening 22. There is. Further, the portion of the peripheral wall portion 21 of the valve body 2 adjacent to the one end side in the axial direction of the valve opening 22 (the lower end side in FIGS. 1 and 5, that is, the axial port 12 side) is set from the circumferential range of the valve opening 22. It is notched except for the peripheral wall portion 21a in a predetermined circumferential range centered on the reinforcing rib 25, which is also narrow. The notched portion of the peripheral wall portion 21 is shown by a two-dot chain line in FIG.

Here, in the portion where the peripheral wall portion 21 adjacent to one end side in the axial direction of the valve opening 22 is cut out, the passage area between the valve opening 22 and the axial port 12 is increased by the thickness of the peripheral wall portion 21. Therefore, it is possible to suppress an increase in passage resistance in the valve body 2 due to the reduction in the diameter of the valve body 2. Further, when the peripheral wall portion 21 of the circumferential portions having no valve opening 22 is opposed to the first and the diameter of the second direction port 13 _1, 13 _2, each radial port acting on the portion of the peripheral wall 21 13 _1, 13 ₂ of the fluid pressure can be received by the peripheral wall portion 21a existing in a predetermined circumferential direction range centered the reinforcing ribs 25 via the reinforcing ribs 25. Therefore, the peripheral wall portion 21 which faces the axial end also part of the peripheral wall portion 21 of the valve body 2 adjacent to the side notching except the peripheral wall portion 21a, the radial ports 13 _1, 13 ₂ of the valve opening 22 it caused the deflection of the portion not, each radial port 13 _1, 13 ₂ of the sealing failure can be prevented.

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 of the above embodiment is an electric type in which the valve body 2 is rotated by a motor 3, but may be a manual type.

1 ... valve housing, 11 ... valve chamber, 12 ... axial port, 13 ₁ ... first radial port, 13 ₂ ... second radial port, 2 ... valve body, 21 ... peripheral wall, 21a ... centered on reinforcing ribs Peripheral wall portion in a predetermined circumferential range, 22 ... valve opening, 25 ... reinforcing rib.

Claims (1)

A valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and a pair of first and second radial ports that open at two locations in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a valve housing and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one axial end of the valve body always communicates with the internal space of the valve body and the axial port. In a three-way valve, a single valve opening is formed on the peripheral wall of the valve body so that the internal space of the valve body and the first and second radial ports can be communicated by the rotation of the valve body. ,
The valve body is provided with reinforcing ribs extending in the axial direction along the radial direction of the valve body passing through the circumferential middle portion of the valve opening.
The peripheral wall portion of the valve body adjacent to one end side in the axial direction of the valve opening is cut out except for the peripheral wall portion in a predetermined circumferential direction centered on the reinforcing rib, which is narrower than the circumferential range of the valve opening. A three-way valve characterized by being present.

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