JP7152342B2 - rotary switching valve - Google Patents

Description

The present invention comprises a valve chamber having a cylindrical peripheral surface, an axial port communicating with one axial end of the valve chamber, and at least one radial port opening at a portion of the peripheral surface of the valve chamber in the circumferential direction. and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber, and one end in the axial direction of the valve body always communicates the inner space of the valve body with the axial port. and a rotary switching valve in which a valve opening is formed in the peripheral wall of the valve body so that the internal space of the valve body can communicate with a radial port by rotation of the valve body.

Originally, in this type of rotary switching valve, an annular packing that contacts the outer peripheral surface of the peripheral wall of the valve body is mounted in an annular packing mounting groove provided around the opening end of the radial port with respect to the valve chamber. The packing can prevent fluid from leaking from the radial port into the gap between the outer peripheral surface of the peripheral wall portion of the valve body and the peripheral surface of the valve chamber.

In addition, the outer peripheral groove wall of the packing mounting groove, the inner peripheral groove wall of the packing mounting groove surrounding the opening end of the radial port to the valve chamber, and the bottom of the packing mounting groove that receives the base end portion of the packing opposite to the valve chamber side It is also possible to form the walls integrally with the valve housing. However, in this case, it becomes necessary to install the packing into the packing installation groove from the valve chamber side, which deteriorates the assembling efficiency.

Therefore, conventionally, the outer peripheral groove wall of the packing mounting groove is formed integrally with the valve housing, but the inner peripheral groove wall and the bottom wall of the packing mounting groove are formed separately from the valve housing, and are attached to the valve housing at the radial direction port. There is known one formed in a fittingly fixed annular packing mounting member (see, for example, Patent Document 1). According to this, the packing can be assembled by simply inserting the packing mounting member into the radial port from the outside in a state in which the packing is externally fitted in the inner peripheral groove wall formed in the packing mounting member, and the assembly is easy. improves.

Here, in the conventional example described above, the packing mounting member is fixed to the valve housing by pressing the packing mounting member from the outside by a mouthpiece member separate from the valve housing, which is attached to the outer end of the radial port. there is This requires a mouthpiece member and a seal member for sealing between the mouthpiece member and the valve housing, increasing the number of parts and increasing the cost.

JP 2018-168969 A

In view of the above points, it is an object of the present invention to provide a rotary switching valve that uses a packing mounting member and is capable of achieving cost reduction.

In order to solve the above-mentioned problems, the present invention provides 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 portion of the peripheral surface of the valve chamber opening in the circumferential direction. A valve housing having at least one radial port, and a valve body having a cylindrical peripheral wall portion rotatably provided in a valve chamber, wherein one axial end of the valve body communicates with the inner space of the valve body and the shaft. A rotary switching valve that is open so as to always communicate with a directional port, and in which a valve opening is formed in the peripheral wall of the valve body so that the internal space of the valve body and the radial direction port can be communicated by rotation of the valve body. An annular packing is mounted in an annular packing mounting groove provided around the opening end of the radial port for the valve chamber, and is in contact with the outer peripheral surface of the peripheral wall portion of the valve body. It is formed integrally with the housing and has an inner circumferential groove wall of a packing mounting groove surrounding the opening end of the radial port to the valve chamber, and a bottom wall of the packing mounting groove receiving the base end portion of the packing opposite to the valve chamber side. wherein an annular packing mounting member separate from the valve housing is provided, and the packing mounting member is fitted and fixed to the valve housing at the radial port, wherein the means for fixing the packing mounting member to the valve housing comprises the valve housing and the valve housing; It is characterized in that it is configured without using parts other than the packing mounting member.

According to the present invention, since the packing mounting member is fixed to the valve housing by the fixing means configured without using any parts other than the valve housing and the packing mounting member, the number of parts does not increase, and the above-described conventional example can be achieved. Cost can be reduced in comparison.

Examples of fixing means include press-fitting, thermal deformation, adhesion, etc., but these are more or less troublesome. On the other hand, a groove is formed in the peripheral wall surface of the radial port of the valve housing, and the packing mounting member is provided with a claw portion that elastically enters and engages with the groove, and is fixed by the groove and the claw portion. If the means is constructed, the packing mounting member can be fixed with one touch only by inserting the packing mounting member into the radial port from the outside, thereby improving the assembling efficiency.

FIG. 2 is a cutaway side view of the rotary switching valve of the embodiment of the present invention; FIG. 2 is a plan view cut along II-II in FIG. 1; The perspective view of the valve body provided in the rotary switching valve of embodiment. FIG. 4 is a perspective view of a packing and a packing mounting member provided in the rotary switching valve of the embodiment; FIG. 4 is a perspective view of a state in which the upper half of the valve housing provided in the rotary switching valve of the embodiment is cut;

The rotary switching valve of the embodiment of the present invention shown in FIGS. 1 and 2 includes a valve chamber 11 having a cylindrical peripheral surface and an axial port communicating with one axial end (lower end in FIG. 1) of the valve chamber 11. 12 and a pair of first and second radial ports 13 ₁ and 13 ₂ that open at two circumferential locations on the circumferential surface of the valve chamber 11 . This rotary switching valve has a mixing ratio of the first fluid flowing from the first radial port ₁₃₁ to the axial port 12 and the second fluid flowing from the _second radial port 132 to the axial port 12. or a distribution valve for switching the ratio of distribution of the fluid flowing into the axial port 12 to the _first radial port 13-1 and the _second radial port 13-2.

The rotary switching valve further includes a valve body 2 having a cylindrical peripheral wall portion 21 rotatably provided within the valve chamber 11 . Also referring to FIG. 3 , one axial end of the valve body 2 is open so that the internal space of the valve body 2 and the axial port 12 are always communicated with each other. In addition, a single valve opening is formed in the peripheral wall portion 21 of the valve body 2 so that the inner space of the valve body 2 can communicate with the first and second radial ports 13 ₁ and 13 ₂ by rotation of the valve body 2 . 22 are formed. A valve shaft 23 is erected on the end wall of the other axial end of the valve body 2 . The valve shaft 23 is connected to a motor 3 mounted on the outer surface of the valve housing 1 so that the motor 3 rotates the valve body 2 .

Also, a stopper projection 24 is protruded at one place on the outer peripheral portion of the end wall of the other axial end of the valve body 2 to be inserted into an arcuate groove 14 formed in the other axial end surface of the valve chamber 11 . . The rotation range of the valve body 2 is restricted by the stopper projections 24 coming into contact with both ends of the arcuate groove 14 .

The valve body 2 is further provided with reinforcing ribs 25 extending axially along the diameter of the valve body 2 passing through the circumferentially intermediate portion of the valve opening 22 . Here, when the circumferential wall portion 21 in the circumferential portion where the valve opening 22 does not exist faces the first and second radial ports 13 ₁ and 13 ₂ and closes the radial ports 13 ₁ and 13 ₂ . , the portions of the peripheral wall 21 facing the radial ports 13 ₁ , 13 ₂ are pushed by the fluid pressure of the radial ports _{13 1} , 13 ₂ and bend radially inward. resulting in ₁₃₂ seal failures. The reinforcing ribs 25 help prevent sealing failures of the radial ports 13 ₁ and 13 ₂ as will be described later.

By the way, if the diameter of the valve body 2 is also reduced for the purpose of reducing the size of the valve, the passage resistance in the valve body 2 will increase. Therefore, the portion of the peripheral wall portion 21 of the valve body 2 adjacent to one axial end side of the valve opening 22 (the lower end side of FIGS. 1 and 3, i.e., the axial port 12 side) is moved from the circumferential range of the valve opening 22. It is notched except for a narrow peripheral wall portion 21a in a predetermined peripheral direction centered on the reinforcing rib 25.例文帳に追加A cutout portion of the peripheral wall portion 21 is indicated by a chain double-dashed line in FIG. According to this, in the portion where the peripheral wall portion 21 is notched, the passage area between the axial direction port 12 is increased by the thickness of the peripheral wall portion 21, and the passage resistance in the valve body 2 due to the reduction in the diameter of the valve body 2 is increased. increase can be suppressed.

When the peripheral wall portion 21 of the peripheral portion where the valve opening 22 does not exist faces the first and second radial ports 13 ₁ and 13 ₂ , each radial port acting on the portion of the peripheral wall portion 21 The fluid pressures of 13 ₁ and 13 ₂ can be received by the peripheral wall portion 21 a via reinforcing ribs 25 . Therefore, it is possible to prevent a sealing failure due to bending of the portion of the peripheral wall portion 21 facing the radial ports 13 ₁ and 13 ₂ .

An annular packing mounting groove 4 is provided around the opening ends of the first and second radial ports 13 ₁ and 13 ₂ with respect to the valve chamber 11 . Annular packings 5 in contact with the outer peripheral surface of the peripheral wall portion 21 of the valve body 2 are mounted in the packing mounting grooves 4 . Each packing mounting groove 4 and each packing 5 has a substantially square annular shape when viewed from the valve chamber 11 side.

Further, in this embodiment, the outer groove wall 41 of each packing mounting groove 4 is formed integrally with the valve housing 1 . On the other hand, the inner circumferential groove walls 42 of the packing mounting grooves 4 surrounding the opening ends of the radial ports 13 ₁ and 13 ₂ with respect to the valve chamber 11 and the base ends 51 of the packings 5 opposite to the valve chamber 11 side are received. The bottom wall 43 of each packing mounting groove 4 is formed in each annular packing mounting member 6 which is separate from the valve housing 1 and is fitted and fixed to the valve housing 1 at each of the radial ports 13 ₁ and 13 ₂ . ing.

Referring to FIG. 4, at four locations in the circumferential direction of cylindrical portion 61 extending outward from the bottom wall 43 of each packing mounting member 6, elastically deformable radially of cylindrical portion 61 is provided. A claw portion 62 is provided on the outer surface side of the cylinder portion 61 . Further, as shown in FIG. 5, grooves 131 corresponding to the claw portions 62 are formed on the peripheral surfaces of the radial ports 13 ₁ and 13 ₂ . When each packing mounting member 6 is inserted into each of the radial ports 13 ₁ and 13 ₂ from the outside while each packing 5 is fitted to the inner peripheral groove wall 42 formed in each packing mounting member 6 . , when each packing mounting member 6 reaches a predetermined set position, each pawl portion 62 elastically enters into the recessed groove 131 and engages, and each packing mounting member 6 is in each radial direction port 13 ₁ , 13 ₂ . It is fitted and fixed to the valve housing 1 .

A base end portion 51 of each packing 5 is formed in a flange shape that bends toward the outer peripheral side. In addition, a step 132 facing outward is formed on the peripheral surface of each of the radial ports 13 ₁ and 13 ₂ so as to be located at the base end of the outer peripheral groove wall 41 of each packing mounting groove 4 . Then, when each packing mounting member 6 reaches the set position, the flange-like base end portion 51 of each packing 5 is sandwiched between the step 132 and the bottom wall 43 .

Further, ridges 63 are provided at diagonal positions on the outer surface of the distal end portion of the cylindrical portion 61 of each packing mounting member 6 . On the other hand, grooves 133 extending in the longitudinal direction of the radial ports 13 ₁ and 13 ₂ are formed at diagonal positions on the peripheral surfaces of the radial ports 13 ₁ and 13 ₂ and engageable with the ridges 63 . . The phases of the packing mounting members 6 are determined by the engagement of the ridges 63 with the grooves 133 .

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, in the above-described embodiment, the means for fixing each packing mounting member 6 to the valve housing 1, which is configured without using parts other than the valve housing 1 and each packing mounting member 6, is provided by each of the radial ports 13 ₁ and 13 ₂ . , and claw portions 62 provided on each packing mounting member 6. However, it is also possible to constitute fixing means by press fitting, thermal deformation, adhesion, or the like. However, according to the above embodiment, only by inserting the packing mounting members 6 into the radial ports 13 ₁ and 13 ₂ from the outside, the claws 62 are engaged with the recessed grooves 131 and the packings can be mounted with one touch. Since the member 6 can be fixed, it is advantageous in that the ease of assembly is improved.

In the above embodiment, the valve housing 1 is provided with the first and second radial ports 13 ₁ and 13 ₂ . The present invention can also be applied to a rotary switching valve that communicates with or blocks communication with a port or switches the flow rate of fluid flowing between both ports. Furthermore, although the rotary switching valve of the above embodiment is an electric type in which the valve body 2 is rotated by the motor 3, it may be a manual type.

DESCRIPTION OF SYMBOLS 1... Valve housing 11... Valve chamber 12... Axial port ₁₃₁ , 132... Radial port 131... Concave groove ₂ ... Valve body 21... Peripheral wall part 22... Valve opening 4... Packing attachment Groove 41 Outer peripheral groove wall of packing mounting groove 42 Inner peripheral groove wall of packing mounting groove 43 Bottom wall of packing mounting groove 5 Packing 51 Base end of packing 6 Packing mounting member 62... Claw portion.

Claims (2)

a valve housing having a valve chamber having a cylindrical peripheral surface, an axial port communicating with one axial end of the valve chamber, and at least one radial port opening in a circumferential portion of the peripheral surface of the valve chamber; a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber, one end in the axial direction of the valve body being open so as to always communicate the inner space of the valve body and the axial port; A rotary switching valve in which a valve opening is formed in the peripheral wall of the valve body so that the inner space of the valve body can communicate with the radial port by rotation of the valve body,
An annular packing that contacts the outer peripheral surface of the peripheral wall portion of the valve body is attached to an annular packing attachment groove provided around the opening end of the radial port with respect to the valve chamber,
The outer peripheral groove wall of the packing mounting groove is formed integrally with the valve housing and consists of the inner peripheral groove wall of the packing mounting groove surrounding the opening end of the radial port for the valve chamber and the base end of the packing opposite to the valve chamber side. wherein an annular packing mounting member separate from the valve casing is provided, the packing mounting member having a bottom wall of the packing mounting groove for receiving the packing, and the packing mounting member is fitted and fixed to the valve casing at the radial port,
1. A rotary switching valve, wherein means for fixing the packing mounting member to the valve casing is constructed without using parts other than the valve casing and the packing mounting member. A groove is formed in the peripheral wall surface of the radial port of the valve housing, and the packing mounting member is provided with a claw portion that elastically enters and engages with the groove. 2. The rotary switching valve according to claim 1, characterized in that:

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