JP2020159440A - Rotary switching valve - Google Patents

Abstract

To reduce costs by fixing packing mounting members without using other components excluding the packing mounting members and a valve casing in a rotary type switching valve in which annular packings 5 are mounted in annular packing mounting grooves 4 formed around opening ends to a valve chest 11, of radial ports 131, 132 formed on the valve casing 1, the annular packing mounting members 6 having inner peripheral-side groove walls 42 and bottom walls 43 of the packing mounting grooves are disposed separately from the valve casing, and the packing mounting members are fitted and fixed to the valve casing at the radial ports.SOLUTION: Recessed grooves 131 are formed on peripheral wall surfaces of radial ports 131, 132 of a valve casing 1, and claw portions 62 elastically fitted to and engaged with the recessed grooves 131 are disposed on the packing mounting members 6. Fixing means of the packing mounting members 6 are composed of the recessed grooves 131 and the claw portions 62. Further the packing mounting members 6 may be fixed by press fitting, thermal deformation, adhesion and the like.SELECTED DRAWING: Figure 2

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 at least one radial port opening in a part of the peripheral surface of the valve chamber in the circumferential direction are provided. 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. The present invention relates to a rotary switching valve in which a valve opening is formed on the peripheral wall portion of the valve body so that the internal space of the valve body and the radial port can be communicated with each other by the rotation of the valve body.

Originally, in this type of rotary switching valve, an annular packing in contact with the outer peripheral surface of the peripheral wall portion 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 prevents fluid from leaking from the radial port into the gap between the outer peripheral surface of the peripheral wall of the valve body and the peripheral surface of the valve chamber.

The outer peripheral side groove wall of the packing mounting groove, the inner peripheral side groove wall of the packing mounting groove surrounding the opening end of the radial port with respect to the valve chamber, and the bottom of the packing mounting groove that receives the base end opposite to the valve chamber side of the packing. It is also possible to integrally form the wall with the valve housing. However, in this case, it is necessary to mount the packing in the packing mounting groove from the valve chamber side, which deteriorates the assembling property.

Therefore, conventionally, the outer peripheral side groove wall of the packing mounting groove is integrally formed with the valve housing, but the inner peripheral side groove wall and the bottom wall of the packing mounting groove are separate from the valve housing, and are formed in the valve housing at the radial port. It is known that it is formed on an annular packing mounting member that is fitted and fixed (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 with the packing externally fitted to the inner peripheral groove wall formed on the packing mounting member, and the assembleability is improved. improves.

Here, in the above-mentioned conventional example, 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 portion of the radial port. There is. In this case, a base member is required, and a seal member for sealing between the base member and the valve housing is also required, which increases the number of parts and increases the cost.

JP-A-2018-1686969

In view of the above points, it is an object of the present invention to provide a rotary switching valve using a packing mounting member and capable of reducing costs.

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 a part of the peripheral surface of the valve chamber 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 the valve chamber are provided, and one axial end of the valve body is the internal space and axis of the valve body. It is a rotary switching valve that is open so as to always communicate with the directional port and has a valve opening formed on the peripheral wall of the valve body so that the internal space of the valve body and the radial port can be communicated by the rotation of the valve body. An annular packing that is in contact with the outer peripheral surface of the peripheral wall of the valve body is mounted in the annular packing mounting groove provided around the opening end of the radial port with respect to the valve chamber, and the outer peripheral groove wall of the packing mounting groove is a valve. It has a groove wall on the inner peripheral side of the packing mounting groove that is integrally formed with the housing and surrounds the opening end of the radial port with respect to the valve chamber, and a bottom wall of the packing mounting groove that receives the base end opposite to the valve chamber side of the packing. An annular packing mounting member that is separate from the valve housing is provided, and the packing mounting member is fitted and fixed to the valve housing at the radial port. The packing mounting member is fixed to the valve housing by means of the valve housing and the valve housing. It is characterized in that it is configured without using any 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 conventional example is used. Compared to this, cost reduction can be achieved.

As the fixing means, press-fitting, thermal deformation, adhesion and the like can be exemplified, but these take some time and effort. On the other hand, a concave groove is formed on 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 concave groove, and is fixed by the concave groove and the claw portion. If the means is configured, the packing mounting member can be fixed with one touch simply by inserting the packing mounting member into the radial port from the outside, and the assembling property is improved.

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

The rotary switching 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 communicating with an axial end (lower end of FIG. 1) of the valve chamber 11. 12, comprises 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 rotary switching valve, 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 for switching, 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 rotary switching valve further includes a valve body 2 having a cylindrical peripheral wall portion 21 rotatably provided in the valve chamber 11. With reference to FIG. 3, 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, a stopper protrusion 24 inserted into the arcuate groove 14 formed on the other end surface of the valve chamber 11 in the axial direction is projected at one position on the outer peripheral portion of the end wall at the other end in the axial direction of the valve body 2. .. The rotation range of the valve body 2 is limited by the stopper protrusions 24 contacting both ends of the arcuate groove 14.

The valve body 2 is further provided with a reinforcing rib 25 extending in the axial direction along the radial direction of the valve body 2 passing through the circumferential intermediate portion of the valve opening 22. Here, when the valve opening 22 is the peripheral wall 21 of the circumferential portions having no closed first and one second each radial port _13, 13 ₂ opposed each radial port 13 1 to _{13 2} , each radial port ₁₃ 1, 13 the ₂ parts of the opposing wall portions 21 to flex pushed in the radial direction side to the fluid pressure of each radial port ₁₃ 1, 13 _2, each radial port ₁₃ 1, 13 results in ₂ of the seal failure. Reinforcing ribs 25 serve to prevent the poor sealing of the radial ports ₁₃ 1, 13 ₂ as will be described later.

By the way, if the diameter of the valve body 2 is also reduced in order to reduce the size of the valve, the passage resistance in the valve body 2 becomes large. Therefore, 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 3, 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. According to this, in the portion where the peripheral wall portion 21 is cut out, the passage area between the peripheral wall portion 21 and the axial 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. Can be suppressed from increasing.

Incidentally, 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 through the reinforcing ribs 25. Therefore, it is possible to prevent causing poor sealing at the deflection of the portion of each radial port 13 _1, 13 ₂ opposed to the peripheral wall portion 21.

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. 4, four locations in the circumferential direction of the tubular portion 61 extending outward from the portion of each packing mounting member 6 that becomes the bottom wall 43 can be elastically deformed in the radial direction of the tubular portion 61 to the outside. A claw portion 62 is provided whose end portion is raised on the outer surface side of the tubular portion 61. Further, as shown in FIG. 5, the peripheral surface of the 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.

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 embodiment, configured without using the valve housing 1 and the parts other than the packing mounting member 6, the valve housing and fixing means for one, each radial port 13 1 of the packing mounting members _6, 13 ₂ Although it is composed of a concave groove 131 formed on the peripheral surface of the above and a claw portion 62 provided on each packing mounting member 6, it is also possible to form a fixing means by press fitting, thermal deformation, adhesion or the like. However, according to the above embodiment, only the respective packing mounting member 6 is inserted from the outside in each radial port 13 _1, 13 _2, each packing mounting one-touch claw portion 62 is engaged with the groove 131 Since the member 6 can be fixed, the assembling property is improved, which is advantageous.

In the above embodiment, the first and second two radial ports 13 1 to the valve housing _1, 13 is ₂ is provided, provided with a single radial port, axial port and a radial direction The present invention can also be applied to a rotary switching valve that communicates with and shuts off a port and switches the flow rate of a fluid flowing between both ports. Further, the rotary switching valve of the above embodiment is an electric type in which the valve body 2 is rotated by the motor 3, but may be a manual type.

1 ... valve housing, 11 ... valve chamber, 12 ... axial port, 13 ₁ , 13 ₂ ... radial port, 131 ... concave groove, 2 ... valve body, 21 ... peripheral wall, 22 ... valve opening, 4 ... packing mounting Groove, 41 ... Outer peripheral side groove wall of packing mounting groove, 42 ... Inner peripheral side 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 part.

Claims (2)

A valve housing having a valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and at least one radial port opening in a part of the peripheral surface of the valve chamber in the circumferential direction. It is equipped with 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 is opened so as to always communicate with the internal space of the valve body and the axial port. A rotary switching valve in which a valve opening is formed on the peripheral wall of the valve body so that the internal space of the valve body and the radial port can be communicated with each other by the rotation of the valve body.
An annular packing that is in contact with the outer peripheral surface of the peripheral wall of the valve body is mounted in the annular packing mounting 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 integrally formed with the valve housing, and the inner peripheral groove wall of the packing mounting groove surrounding the opening end of the radial port with respect to the valve chamber and the base end portion opposite to the valve chamber side of the packing are formed. An annular packing mounting member having a bottom wall of a packing mounting groove to be received, which is separate from the valve housing, is provided, and the packing mounting member is fitted and fixed to the valve housing at a radial port.
A rotary switching valve characterized in that the means for fixing the packing mounting member to the valve housing is configured without using any parts other than the valve housing and the packing mounting member. A concave groove is formed on 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 concave groove, and the concave groove and the claw portion form a fixing means. The rotary switching valve according to claim 1, wherein the rotary switching valve is characterized in that.

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