JP7437342B2 - Slide type switching valve - Google Patents

Description

The present invention relates to a slide type switching valve suitable for use in a refrigeration cycle system such as an air conditioner.

Conventionally, switching valves that switch the refrigerant flow path in refrigeration cycles, etc., have a cylindrical valve body, a bowl-shaped valve body that is slidably provided inside the valve body, and a plurality of joint pipes that are fixed to the valve body. A slide type switching valve is known that includes a valve seat member to which is connected, and a plate-shaped sealing plate fixed to the valve seat member and having a plurality of valve ports (Patent Document 1). The plate-shaped sealing plate has a sliding surface on the inside of the valve body on which the valve body slides, and a fixing surface that is fixed to the valve seat member on the opposite side of the sliding surface.

China Patent Publication No. 107781455

In the conventional switching valve described above, in the plate-shaped sealing plate, the original warpage of the plate material may remain even after molding, making it difficult to obtain flatness. For this reason, there is a possibility that stable sealing performance between the sealing plate and the valve body cannot be obtained.

In a slide type switching valve, the present invention corrects the flatness of a plate-shaped sliding member on which the valve body slides and suppresses warping, thereby achieving good sealing performance and increasing the degree of close contact with the valve body. The challenge is to ensure fixing strength.

The slide type switching valve of the present invention includes a hollow cylindrical valve body, a valve body slidably provided inside the valve body, and a plate-shaped sliding member fixed to the valve body and in sliding contact with the valve body. A sliding switching valve includes a contacting member, the sliding contacting member being formed entirely in a plate shape, and having a plurality of valve ports lined up in the sliding direction of the valve body, and an inner side of the valve body. a flat sliding surface on which the valve body slides, and a flat fixing surface fixed to the valve body on the opposite side to the sliding surface; It is characterized in that an uneven portion is provided on almost the entire surface.

In this case, it is preferable to use a slide type switching valve characterized in that the uneven portion is composed of a plurality of discretely provided dimple-shaped recesses.

Further, it is preferable that the uneven portion is constituted by a plurality of annular grooves surrounding the valve port.

Further, it is preferable that the uneven portion is constituted by a plurality of linear grooves that extend linearly without being continuous with the valve port.

The uneven portion may include a plurality of linear grooves that extend linearly without being continuous with the valve port, a plurality of intersecting grooves that intersect the linear groove, or a plurality of branch grooves that branch from the linear groove. A slide type switching valve characterized by the following configuration is preferable.

Further, it is preferable that the slide type switching valve is characterized in that a chamfer is provided on the sliding surface side of the inner peripheral edge of the valve port.

Further, it is preferable that the slide type switching valve is characterized in that the sliding contact member is fixed to the valve body by adhesive bonding.

Further, it is preferable that the valve body is formed by resin molding.

Preferably, the sliding switching valve is characterized in that the sliding contact member is integrated into the valve body by insert molding.

According to the slide type switching valve of the present invention, since the fixed surface of the sliding contact member is provided with irregularities, the flatness of the sliding contact surface can be corrected to obtain good sealing performance with the valve body. Fixing strength can be ensured by increasing the degree of adhesion between this sliding member and the valve body. Furthermore, by increasing the degree of close contact with the valve body, it is possible to suppress back leakage from the fixed portion between the sliding member and the valve body.

FIG. 2 is a longitudinal cross-sectional view of the slide type switching valve according to the embodiment of the present invention in a first state. It is a longitudinal cross-sectional view of the 2nd state of the slide type switching valve of an embodiment. 2 is a cross-sectional view taken along the line AA in FIG. 1. FIG. It is a top view of the fixed surface of the valve seat member (sliding member) in the slide type switching valve of the embodiment. It is a figure which shows the modification of the fixed surface of the valve seat member (sliding contact member) in the slide type switching valve of embodiment. It is a partially enlarged sectional view of a valve seat member (sliding member) in the slide type switching valve of the embodiment.

Next, embodiments of the slide type switching valve of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a slide type switching valve according to an embodiment of the present invention in a first state, FIG. 2 is a vertical cross-sectional view of a slide type switching valve according to an embodiment of the present invention in a second state, and FIG. 4 is a plan view of the fixed surface of the valve seat member (sliding contact member) in the slide type switching valve of the embodiment, and FIG. 5 is a valve seat member (sliding contact member) in the slide type switching valve of the embodiment. FIG. 6 is a partially enlarged sectional view of the valve seat member (sliding member) in the slide type switching valve of the embodiment. Note that the concept of "up and down" in the following description corresponds to the up and down in the drawings of FIGS. 1 and 2.

As shown in FIG. 1, this slide type switching valve includes a valve body 1, a valve body 2, a leaf spring 3 as a "biasing member", a valve seat member 4 as a "sliding member", and a housing. 5, a holder portion 6, a magnet rotor 7, and a stator coil 8.

The valve body 1 is formed into a substantially cylindrical shape by resin molding, and has a substantially cylindrical valve chamber 1A inside thereof. Further, the valve body 1 has a side wall portion 11 that is parallel to the sliding direction of the valve body 2 that is parallel to the axis X, and a bottom portion 12 that intersects with this side wall portion 11. The side wall portion 11 of the valve body 1 is provided with a first port 13E, an outlet port 13S, and a second port 13C, and the bottom portion 12 of the valve body 1 is further provided with an inlet port 13D. Note that the first port 13E, the outlet port 13S, and the second port 13C are provided in a part of the side wall portion 11 in a straight line along the sliding direction of the valve body 2. Further, an engagement protrusion 1B is formed on the outer surface of the valve body 1, and by engaging with the engagement groove 5B, the rotational position of the valve body 1 with respect to the housing 5 is regulated. This makes it easy to align the relative positions of the first port 13E, outlet port 13S, and second port 13C of the valve body 1 and the housing-side flow passages 51E, 51S, and 51C on the housing 5 side, which will be described later. , assembly of the valve body 1 to the housing 5 is facilitated. Note that the rotational position of the valve body 1 with respect to the housing 5 may be regulated by providing an engagement groove on the valve body 1 side and an engagement protrusion on the housing 5 side. In this embodiment, the material is resin such as polyphenylene sulfide (PPS), but it may be made of other suitable materials such as metals such as brass, iron, aluminum, and stainless steel.

The valve body 2 has a bulging portion 21 and a hook portion 22 extending from the bulging portion 21 toward the holder portion 6, and a bowl-shaped recess 21A is formed inside the bulging portion 21. The valve body 2 allows the outlet port 13S and the first port 13E to communicate with each other through the bowl-shaped recess 21A at the lower switching end position (first state) in FIG. At this time, the second port 13C communicates with the inlet port 13D within the valve chamber 1A. Further, the valve body 2 allows the outlet port 13S and the second port 13C to communicate with each other through the bowl-shaped recess 21A at the switching end position on the upper side (second state) in FIG. At this time, the first port 13E communicates with the outlet port 13D within the valve chamber 1A.

Further, the hook portion 22 of the valve body 2 is engaged with an end portion of a guide shaft 23 having a rounded prismatic shape and extending along the axis X. That is, the guide shaft 23 is fitted into the holder portion 6 and has an engagement groove 231 on the outer periphery on the valve body 2 side, and the hook portions 22 of the pair of valve bodies 2 are engaged with the engagement groove 231. Further, at the center of the guide shaft 23, a female screw portion 23a coaxial with the axis X and a screw hole thereof are formed. Furthermore, a plate spring 3 serving as a "biasing member" is attached to the upper part of the bulging part 21 of the valve body 2 by a boss part 21a of the bulging part 21.

The leaf spring 3 includes a base 31 whose longitudinal direction is the sliding direction of the valve body 2 (direction along the axis have. Each of the folded portions 32 is provided with a protrusion 33, and the elastic force of the folded portion 32 brings the protrusion 33 into contact with the inner circumferential surface of the valve body 1. As a result, as shown in FIG. 3, the valve body 2 is pressed against a valve seat surface 4A of a valve seat member 4, which will be described later.

The inside of the valve chamber 1A of the valve body 1 is made of a thin metal plate that is fixed to the valve body 1 by adhesive or the like, or is fixed by insert molding together with the valve body 1, and is processed by press molding or the like. A case 15 is fixed to the end of the valve body 1 opposite to the bottom 12. The surface of the valve seat member 4 on the axis X side becomes the valve seat surface 4A as a "sliding surface" on which the valve body 2 slides, and the valve seat member 4 has a valve port 4E opposite to the first port 13E. A valve port 4S facing the outlet port 13S and a valve port 4C facing the second port 13C are formed. Further, FIG. 6 is an enlarged sectional view of a portion indicated by a dashed-dotted circle P in FIG. 1, and shows, for example, the area around the valve port 4S facing the outlet port 13S. Note that the valve ports 4E and 4C also have the same structure as the valve port 4S. An R surface 4a shown in FIG. 6(A) or a tapered surface 4b shown in FIG. 5(B) is formed as a "chamfer" on the edge of the valve port 4S on the valve seat surface 4A side. Thereby, when the valve body 2 slides on the valve seat surface 4A, stable operation can be obtained without the valve body 2 getting caught on the edges of the valve ports 4S, 4E, and 4C. The surface of the valve seat member 4 opposite to the valve seat surface 4A is a fixing surface 4B that is fixed to the valve body 1, and this fixing surface 4B is provided with an uneven portion as described later. There is. In addition, the valve ports 4S, 4E, 4C of the valve seat member 4, the "chamfer" of the valve seat surface 4A, and the uneven portion of the fixing surface 4B may all be formed by press molding, and in this case, the "chamfer" is formed by press molding. It is preferable to form a sagging surface by shearing such as. Further, the "chamfer" may be formed by an appropriate method such as cutting by machining or plastic working by pressing with a jig after press-forming the valve port and the "uneven part" described below. The material of the valve seat member 4 may be any suitable material such as metal such as brass, iron, aluminum, or stainless steel. Further, the processing method may be, in addition to press molding, cutting from a plate material.

The housing 5 is made of die-cast aluminum and has a substantially cylindrical housing chamber 5A centered on the axis X, and the valve body 1 is housed in the housing chamber 5A. The housing 5 has an engagement groove 5B on its inner periphery that engages with the engagement protrusion 1B of the valve body 1. Note that a seal is provided between the valve body 1 and the housing 5 by an O-ring 10 at a predetermined position. Further, housing-side channels 51E, 51S, and 51C are formed in the housing 5 and open to the side wall of the accommodation chamber 5A. It communicates with each of the first port 13E, the exit port 13S, and the second port 13C. Furthermore, a housing-side flow path 51D is formed at a position of the housing 5 facing the bottom portion 12 of the valve body 1, and communicates with the valve chamber 1A via an inlet port 13D.

The holder part 6 is mainly made of resin, and includes a substantially cylindrical valve guide part 61, a bearing part 62 formed at the upper end of the valve guide part 61, and an insert molded part on the outer periphery of the valve guide part 61. It is composed of a fixed lid 63 made of metal and approximately disc-shaped. The holder part 6 is fixed by welding to the upper end of the case 15 fixed to the valve body 1 via a fixed lid 63. Note that a C ring 20 that fixes the housing 5 and the valve body 1 is fitted between the upper end of the housing 5 and the fixed lid 63. The valve guide portion 61 is formed with a guide hole 61a coaxial with the axis X and having rounded corners and a prismatic cavity. The guide shaft 23, which is engaged with the hook portion 22 of the valve body 2, is inserted into the guide hole 61a.

Further, a can 64 that seals the valve chamber 1A of the valve body and the inside of the case 15 is fixed to the fixed lid 63, and the magnet rotor 7 is housed within this can 64. A rotor shaft 71 is attached to the center of the magnet rotor 7, and a male threaded portion 71a is provided on the outer periphery of the rotor shaft 71 on the valve body 2 side to be screwed into the female threaded portion 23a of the guide shaft 23 engaged with the valve body 2. It is formed. Further, this rotor shaft 71 is supported by a bearing portion 62 of the holder portion 6. Thereby, the magnet rotor 7 is rotatably supported within the can 64. In addition, sliding washers 66 and 67 are arranged between the bearing part 62 and the flange part 72 of the rotor shaft 71 and between the magnet rotor 7 and the bearing part 62 in the upper part of the guide hole 61a. .

The stator coil 8 is constructed by winding the coils 82A and 82B around a resin bobbin 81 and stacking a pair of coil parts in the axis X direction. A yoke) 83 is integrally assembled by molding. Further, the stator coil 8 has a cylindrical insertion hole 8H centered on the axis X at the center, and the magnetic pole teeth 83a of the yoke 83 are arranged on a part of the inner peripheral surface of the insertion hole 8H. has been done. The stator coil 8 is attached to the valve body 1 by fitting the can 64 of the valve body 1 into the fitting hole 8H. As a result, the magnetic pole teeth 83a of the stator coil 8 are arranged to face the outer peripheral surface of the can 64.

With the above configuration, the coils 82A and 82B generate lines of magnetic force by applying pulse output to the coils 82A and 82B of the stator coil 8. As a result, the magnetic poles (N, S poles) of the magnetic pole teeth 83a change alternately, generating magnetic attraction force and magnetic repulsion force with respect to the magnet rotor 7, and the magnet rotor 7 and rotor shaft 71 rotate. As a result, the guide shaft 23 is moved in the direction of the axis X by the screw feeding mechanism formed by the male threaded portion 71a of the rotor shaft 71 and the female threaded portion 23a of the guide shaft 23 engaged with the valve body 2, and together with this guide shaft 23, the valve is opened. The body 2 slides in the direction of the axis X. Then, the flow path is switched from the first state shown in FIG. 1 to the second state shown in FIG. 2, or from the second state shown in FIG. 2 to the first state shown in FIG. In this way, the rotor shaft 71, the magnet rotor 7, and the screw feeding mechanism constitute a "driver".

The housing-side flow path 51D is connected to the discharge port of the compressor and introduces high-temperature, high-pressure refrigerant into the valve chamber 1A of the valve body 1. The housing-side flow path 51S is connected to the suction port of the compressor and Return the refrigerant to. Moreover, the housing side flow path 51E is communicated with the evaporator of the refrigeration cycle, and the housing side flow path 51C is communicated with the condenser of the refrigeration cycle. In the first state of FIG. 1, the high-temperature refrigerant flowing from the inlet port 13D flows to the second port 13C via the valve chamber 1A, and in the second state of FIG. , flows to the first port 13E via the valve chamber 1A.

FIG. 4 is a plan view of the fixing surface 4B of the valve seat member 4, and the fixing surface 4B has dimple-shaped recesses 41 as "uneven parts" processed during press molding of the valve seat member 4. It is provided. A plurality of these recesses 41 are provided discretely around the valve ports 4C, 4S, and 4E. In this way, since the fixed surface 4B of the valve seat member 4, which is a sliding contact member, is provided with irregularities, the flatness of the plate-shaped valve seat member 4 is corrected, and the valve seat surface 4A (sliding contact surface) Good sealing performance with the valve body 2 can be obtained. Further, when the seat member 4 is bonded or insert-molded to the valve body 1, the degree of closeness of the seat member 4 to the valve body 1 is increased, and fixing strength can be ensured. Therefore, by increasing the degree of close contact with the valve body 1, back leakage from the fixed portion between the fixed surface 4B of the valve seat member 4 and the valve body 1 can be suppressed.

FIG. 5 is a diagram showing a modification of the uneven portion of the valve seat member 4. Modification 1 in FIG. This circular annular groove 42 is composed of a plurality of annular grooves surrounding the valve ports 4C, 4S, and 4E. Modification 2 in FIG. 5(B) is an example in which a polygonal annular groove 43 is formed as an "uneven part" on the fixed surface 4B, and this annular groove 43 has a plurality of grooves surrounding the valve ports 4C, 4S, and 4E. Consists of an annular groove. In these modified examples 1 and 2, in addition to the effects of the embodiment shown in FIG. It is possible to suppress the occurrence of back leakage from the fixing part.

Modified example 3 in FIG. 5(C) is an example in which a plurality of straight grooves 44 extending linearly as "uneven parts" are formed on the fixed surface 4B, and these straight grooves 44 are formed in the valve ports 4C, 4S, and 4E. It is formed without being continuous. Modification 4 in FIG. 5(D) is an example in which a plurality of straight grooves 45 as "uneven parts" and a plurality of branch grooves 46 branching from the straight grooves 45 are formed on the fixed surface 4B. 45 and the branch groove 46 are formed so as not to be continuous with the valve ports 4C, 4S, and 4E. In addition, regarding modification 4, in this embodiment, it is formed by a plurality of branch grooves 46 branching from the straight groove 45, but it may be formed by a plurality of intersecting grooves that intersect by penetrating the straight groove 45, or a plurality of It may be formed by combining branch grooves and intersecting grooves. In these modified examples 3 and 4, in addition to the effects of the embodiment shown in FIG. 4, the creepage distance from the outer edge of the valve seat member 4 to the valve ports 4C, 4S, and 4E via the grooves becomes longer. Further, it is possible to suppress back leakage from the fixed portion between the fixed surface 4B of the valve seat member 4 and the valve body 1. Although some of the above-mentioned modifications have complicated shapes of "uneven parts", they can be easily processed because they are formed using a mold during press molding as described above.

Regarding the "uneven parts" of the valve seat member 4, the depth of the recess 41, the annular grooves 42, 43, the straight grooves 44, 45, the branch grooves 46, etc. are approximately 3 times the plate thickness of the valve seat member 4. % to 80%. Further, it is preferable that the dimple diameter of the recess 41 and the width of the annular grooves 42, 43, straight grooves 44, 45, branched grooves 46, etc. be approximately 0.25 to 2 mm. Further, it is preferable that the area ratio (interval) between the groove and the convex portion around the groove is approximately 30 to 60%.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

1 Valve body 1A Valve chamber 11 Side wall portion 12 Bottom portion 13E First port 13C Second port 13S Outlet port 13D Inlet port 2 Valve body 21 Swelling portion 23 Guide shaft 23a Female thread portion 3 Leaf spring (biasing member)
31 Base 32 Folded portion 4 Valve seat member (sliding contact member)
4A Valve seat surface (sliding surface)
4B Fixed surface 41 Recess (uneven part)
42 Annular groove (uneven part)
43 Annular groove (uneven part)
44 Straight groove (uneven part)
45 Straight groove (uneven part)
46 Branch groove (uneven part)
5 Housing 51E Housing side flow path 51C Housing side flow path 51S Housing side flow path 51D Housing side flow path 6 Holder portion 61 Valve guide portion 62 Bearing portion 63 Fixed lid 7 Magnet rotor 71 Rotor shaft 71a Male thread portion 8 Stator coil

Claims (9)

A sliding type comprising a hollow cylindrical valve body, a valve body slidably provided inside the valve body, and a plate-shaped sliding contact member fixed to the valve body and with which the valve body slides. A switching valve,
The sliding contact member is formed entirely in a plate shape, and includes a plurality of valve ports arranged in the sliding direction of the valve body, and a flat sliding surface on the inside of the valve body with which the valve body slides. a flat fixing surface fixed to the valve body on the opposite side to the sliding contact surface;
A slide type switching valve characterized in that an uneven portion is provided on substantially the entire surface of the fixed surface of the sliding contact member. 2. The slide type switching valve according to claim 1, wherein the uneven portion is composed of a plurality of discretely provided dimple-shaped depressions. 2. The slide type switching valve according to claim 1, wherein the uneven portion is composed of a plurality of annular grooves surrounding the valve port. 2. The slide type switching valve according to claim 1, wherein the uneven portion is composed of a plurality of straight grooves that extend linearly without being continuous with the valve port. The uneven portion includes a plurality of linear grooves that extend linearly without being continuous with the valve port, a plurality of intersecting grooves that intersect the linear groove, or a plurality of branch grooves that branch from the linear groove. The slide type switching valve according to claim 1, characterized in that: The slide type switching valve according to any one of claims 1 to 5, wherein a chamfer is provided on the sliding surface side of the inner peripheral edge of the valve port. The slide type switching valve according to any one of claims 1 to 6, wherein the sliding contact member is fixed to the valve body by adhesive bonding. The slide type switching valve according to any one of claims 1 to 7, wherein the valve body is formed by resin molding. 9. The slide type switching valve according to claim 8, wherein the sliding contact member is integrated into the valve body by insert molding.

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