CN221857611U - Sliding type switching valve - Google Patents

Abstract

The present utility model provides a sliding type switching valve, which improves the valve leakage performance by improving the fixing strength of a valve seat component relative to a valve main body and inhibiting the deformation and stripping of the valve seat component. The sliding type switching valve is provided with: a hollow cylindrical valve body; a valve seat portion provided to the valve main body; a valve body slidably provided in the valve body in the axial direction; and a driving section for slidably driving the valve body, wherein the valve seat section has a metal valve seat member integrated with a resin forming the valve body by insert molding, and the valve seat member has: the sliding contact surface is a plane for sliding contact of the valve core; an abutting face including a curved face protruding to a side opposite to the sliding contact face; and a plurality of valve ports penetrating from the sliding contact surface to the close contact surface, the close contact surface having a larger surface area than the sliding contact surface, the close contact surface of the valve seat member being provided in close contact with the inner peripheral surface of the valve body.

Description

Sliding switch valve

Technical Field

The utility model relates to a sliding type switching valve.

Background Art

As a switching valve for switching the flow path of a refrigerant in a refrigeration cycle, etc., a sliding switching valve is known, which includes a cylindrical valve body, a valve core slidably provided inside the valve body, a valve seat member provided on the valve body, and a driving unit that drives the valve core to slide along the axial direction (for example, refer to Patent Document 1). The valve body is a resin molded component, and the valve seat member is composed of a thin metal plate, and the valve seat member is fixed to the valve body by bonding or insert molding.

Prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application Publication No. 2022-150818

Utility Model Content

Issues to be Solved by Utility Models

In the conventional sliding switching valve, the resin valve body is easily deformed due to pressure fluctuations inside and outside. Therefore, the valve seat component composed of a thin metal plate is deformed along with the deformation of the valve body, and the sealing performance between the valve core and the valve seat component is reduced, which may cause valve leakage. On the other hand, when a valve seat component composed of a thick metal plate is used for a sliding switching valve, the valve body is easily deformed, but the valve seat component is difficult to deform, so there is a possibility that the valve seat component will be separated from the valve body along with the deformation of the valve body.

The utility model aims to provide a sliding type switching valve, which improves the valve leakage performance by increasing the fixing strength of a valve seat component relative to a valve body and inhibiting the deformation and peeling of the valve seat component.

Solutions to Solve Problems

20. The operative position of claim 19, wherein the operative position of the valve core is operative on a rear portion of the spool of the valve body and the spool of the valve core is operative on a rear portion of the spool of the valve body.

According to the utility model, the valve seat component has a close contact surface including a curved surface that is convex to the opposite side of the sliding contact surface, so that the wall thickness of the valve seat component can be increased and its rigidity can be improved compared with the valve seat component composed of a thin metal plate. Therefore, even if the valve body is deformed due to the pressure difference between the inside and the outside, the valve seat component can be suppressed from deforming along with the deformation. In addition, the close contact surface including the curved surface of the valve seat component is in close contact with the inner peripheral surface of the cylinder in the valve body, so compared with the valve seat component composed of a thin metal plate, the close contact area becomes larger, the fixing strength of the valve seat component relative to the valve body can be improved, and the valve seat component can be suppressed from peeling off from the valve body. Therefore, a sliding type switching valve can be provided, which improves the valve leakage performance by improving the fixing strength of the valve seat component relative to the valve body and suppressing the deformation and peeling of the valve seat component. In addition, since the curved surface of the valve seat component can be set along the inner peripheral surface of the valve body, the wall thickness of the valve seat component can be increased without changing the overall size of the sliding type switching valve, and the large-scale sliding type switching valve can be suppressed.

At this time, Scheme 2 is preferably, wherein the valve body comprises: a cylindrical portion; an opening portion, which is open on the side where the driving portion is located; a bottom portion, which is arranged on the side opposite to the side where the driving portion is located; and a wall portion, which is upright and arranged on the inner circumferential surface of the cylindrical portion between the opening portion and the bottom portion, and the valve seat component comprises: a pair of side end surfaces, which connect the sliding contact surface and the side end edges of the curved surface to each other; and a pair of front end surfaces, which constitute the two end portions in the axial direction, the curved surface and the side end surfaces constitute the close-fitting surface, and one of the pair of front end surfaces is in close contact with the bottom portion and the other of the pair of front end surfaces is arranged in close contact with the wall portion.

According to the utility model, the close contact surface of the valve seat component is in close contact with the inner peripheral surface of the cylinder in the valve body, one of the pair of front end surfaces is in close contact with the bottom of the cylinder, and the other of the pair of front end surfaces is in close contact with the wall of the valve body. Thus, by making the portion other than the sliding contact surface of the valve seat component in close contact with the structure on the valve body side, the contact area between the valve seat component and the valve body can be increased in the axial direction and the width direction intersecting the axial direction, and the fixing strength of the valve seat component relative to the valve body can be improved. Therefore, it is possible to suppress the valve seat component from peeling off from the valve body due to the deformation of the valve body.

In addition, in this case, it is preferable that the opening has a circular inner peripheral surface, and the driving part is inserted so as to fit into the inner peripheral surface.

According to such a configuration, for example, when the outer shape of the driving portion is formed in a cylindrical shape, the driving portion can be easily fitted into the opening portion, and the slide-type switching valve can be assembled.

In the fourth aspect, the valve body preferably includes a protrusion that protrudes from the bottom portion toward the opening, and the protrusion is in close contact with the sliding contact surface of the valve seat member.

According to such a configuration, the valve seat member can be fixed by sandwiching the protrusion in close contact with the sliding contact surface and the inner peripheral surface of the cylinder in close contact with the curved surface, so that the fixing strength of the valve seat member to the valve body can be further improved.

In addition, in scheme 5, the valve port preferably includes: an expanded diameter portion that opens on the side opposite to the sliding contact surface; and a step portion that extends from the expanded diameter portion toward the inner diameter side, and the inner peripheral surface of the expanded diameter portion constitutes a part of the close contact surface.

According to such a structure, in the valve seat component, the inner circumferential surface, curved surface, side end surface and front end surface of the expanded diameter portion are all in close contact with the cylindrical portion of the valve body. Therefore, the portion of the valve seat component extending in the axial direction between the expanded diameter portion and the front end surface is difficult to displace in the axial direction, thereby further improving the fixing strength of the valve seat component in the same direction. In addition, according to such a structure, for example, when the valve seat component is embedded, the resin can be injected in a state where the cylindrical pin-shaped mold is pressed against the step portion to close the valve port, thereby forming the valve body. Therefore, the resin can be prevented from intruding into the valve port and the sliding contact surface side.

In addition, in the sixth aspect, it is preferred that the valve seat member has a flat surface parallel to the sliding contact surface on the opposite side of the sliding contact surface, and the flat surface constitutes a part of the close contact surface.

According to such a structure, since a flat surface parallel to the sliding contact surface is formed on the opposite side of the sliding contact surface, the curved surface side of the valve seat component can be easily processed compared to a structure without a flat surface. Specifically, for example, even if a tool such as a drill is pressed on the curved surface side, the tool is difficult to slide, and the hole opening operation from the curved surface side to the sliding contact surface side can be easily and accurately performed. Therefore, the processability when forming the valve port on the valve seat component can be improved.

In addition, in the seventh aspect, it is preferable that a rough surface is formed on at least a part of the curved surface, the pair of side end surfaces, and the pair of front end surfaces.

According to such a structure, since the contact area between the resin and the metal is increased by the irregularities of the rough surface, the fixing strength of the valve seat member to the valve body can be further improved by a so-called anchor effect.

In addition, Scheme 8 is preferably that, with respect to the side end surface, the side where the curved surface is located constitutes a part of the close-fitting surface, the side where the sliding contact surface is located is not in close contact with the valve body and becomes an exposed portion, and the valve body has a guide portion for guiding the valve core in sliding, and a space is formed between the guide portion and the exposed portion.

According to such a structure, even if the valve core is ground and foreign matter is generated due to the sliding of the valve core and the valve seat component, the foreign matter can be released between the guide portion and the exposed portion and stored. Therefore, it is possible to prevent the valve core from tilting due to the collision with the foreign matter, thereby preventing valve leakage from occurring unexpectedly. In addition, according to such a structure, a part of the mold can be arranged in the portion that becomes the space between the guide portion and the exposed portion, for example, when the valve seat component is embedded in the molding. That is, the valve seat component can be guided in a manner of clamping the valve seat component by a part of the mold that abuts against a pair of side end surfaces, thereby improving the positioning accuracy of the valve seat component relative to the valve body.

In addition, in scheme 9, it is preferable that a step surface extending outward in a width direction intersecting the axial direction is provided on the side of the side end surface where the curved surface is located, and the step surface constitutes a part of the close contact surface.

According to such a structure, in the valve seat component, the step surface and the curved surface are in close contact or in close contact with the cylinder of the valve body. Therefore, the valve seat component is clamped by the cylinder along the plate thickness direction from the sliding contact surface toward the curved surface, and is more difficult to move in the same direction, which can further improve the fixing strength of the valve seat component in the same direction.

In addition, in aspect 10, preferably, the valve seat member is formed of a magnetic material.

According to such a configuration, for example, during insert molding of the valve seat member, by installing a magnet or the like in the mold, the valve seat member can be easily fixed to the mold, and the positioning accuracy of the valve seat member can be easily improved.

In addition, in the eleventh aspect, it is preferable that the valve body is housed in a housing connected to a refrigerant pipe with a gap therebetween, and the valve port and the refrigerant pipe can communicate with each other via the gap between the valve body and the housing.

According to such a structure, the pressure resistance of the valve body can be improved by the shell that accommodates the valve body, so the resin itself that constitutes the valve body can be made thinner. In addition, by making the shell, for example, metal, the refrigerant piping and the shell can be easily connected by brazing, welding, etc., and the difficulty of joining the resin valve body made of different materials and the metal refrigerant piping can be avoided. In addition, according to such a structure, the refrigerant piping is connected to the shell, not directly connected to the valve body, so the valve body can be easily detached from the shell, which can help improve the maintainability.

Utility Model Effect

According to the present invention, a slide-type switching valve can be provided which improves valve leakage performance by increasing the fixing strength of a valve seat member relative to a valve body and suppressing deformation and peeling of the valve seat member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a slide-type switching valve according to an embodiment of the present invention cut along the axial direction of a valve body.

FIG. 2 is a cross-sectional view of the valve body and the valve seat portion cut along the axial direction of the valve body.

Fig. 3 is a view taken along line A-A in Fig. 1 .

4(A) is a perspective view of the valve seat member as viewed from obliquely above, FIG. 4(B) is a side view of the valve seat member, and FIG. 4(C) is a perspective view of the valve seat member as viewed from obliquely below.

5 is a cross-sectional view of a valve body and a valve seat portion according to a first modified example, cut along a direction perpendicular to the axis of the valve body.

FIG. 6 is an enlarged cross-sectional view of a region A of FIG. 5 .

7(A) and 7(B) are views showing a method for manufacturing a valve body and a valve seat portion in a first modified example.

FIG. 8 is a diagram showing a method for manufacturing a valve body and a valve seat portion according to a first modified example.

9 is a cross-sectional view of a valve body and a valve seat portion according to a second modified example, cut along a direction perpendicular to the axis of the valve body.

FIG. 10 is an enlarged cross-sectional view of a region B of FIG. 9 .

11 is a cross-sectional view showing a valve body and a valve seat portion according to the second embodiment cut along the axial direction of the valve body.

FIG. 12 is an enlarged cross-sectional view of a region C of FIG. 11 .

FIG. 13 is a perspective view of a valve seat portion in the second embodiment.

In the figure:

a—close fitting surface; L—axis line; 1—sliding switching valve; 10—valve body; 11—bottom wall (bottom); 12—side wall (cylinder); 12a—opening; 19—wall; 20—valve seat; 21—valve seat component; 22—sliding contact surface; 23—curved surface; 24—side end surface; 25—front end surface; 26—E switching port (multiple valve ports); 27—S port (multiple valve ports); 28—C switching port (multiple valve ports); 30—valve core; 40—driving part.

DETAILED DESCRIPTION

Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4(C). The sliding switching valve 1 of the present embodiment is a switching valve that is connected to a compressor, an outdoor heat exchanger, and an indoor heat exchanger in a refrigeration cycle, etc., and switches the flow path of the refrigerant flowing in these devices. The sliding switching valve 1 includes a hollow cylindrical valve body 10, a valve seat portion 20 provided in the valve body 10, a valve core 30 slidably provided inside the valve body 10 along the axis L direction, a driving portion 40 that drives the valve core 30 to slide, and a housing 50 that accommodates the valve body 10. In addition, in the description of the present embodiment, in the axis L direction of the valve body 10, the side where the driving portion 40 is located is set as the axis L direction side, which is recorded as one side L1. In addition, in the axis L direction of the valve body 10, the opposite side of the one side L1 is set as the other side, which is recorded as the other side L2. In addition, a direction perpendicular to the axis L and corresponding to the short side direction of the valve seat member 21 described later is referred to as a width direction Y, one side of the width direction Y is referred to as a left side Y1, and the other side of the width direction Y is referred to as a right side Y2. In addition, a depth direction of the valve core 30 is referred to as an up-down direction Z, one side of the up-down direction Z is referred to as an upper side Z1, and the other side of the up-down direction Z is referred to as a lower side Z2.

As shown in FIG. 1 , the valve body 10 includes a circular bottom wall 11, a cylindrical side wall 12 (cylindrical portion) extending from the peripheral edge of the bottom wall 11 to one side L1, an opening 12a formed on one side L1 of the side wall 12, and a valve chamber 13 provided inside the side wall 12, and is formed into a bottomed cylindrical shape by resin molding using polyphenylene sulfide (PPS) or the like as a material. A D port 14 communicating with the inside and outside of the valve chamber 13 is formed on the bottom wall 11. The D port 14 is connected to the discharge hole of the compressor via a D connecting flow path 14d extending in the direction of the axis L, a D connecting path 53 described later, and a D joint pipe 53d. As shown in FIG. 2 , a plate-shaped protrusion 15 protruding in the direction of the axis L toward the opening 12a is formed on the wall surface of the bottom wall 11 on the valve chamber 13 side. As shown in FIG. 3 , a pair of protrusions 15 are provided at a distance from each other in the width direction Y, and surfaces facing the lower side Z2 are in close contact with a sliding contact surface 22 of a valve seat member 21 described later.

An opening 12a having a circular inner peripheral surface is provided at the end of one side L1 of the side wall 12, and is communicated with the valve chamber 13 inside. On the wall surface of the side wall 12, as a plurality of flow paths communicating with the inside and outside of the valve chamber 13, an E connection flow path 16, an S connection flow path 17, and a C connection flow path 18 are formed in sequence from one side L1 along the axis L direction. The E connection flow path 16 is communicated with the indoor heat exchanger (evaporator or condenser) via the E switching port 26, the E communication path 54, and the E joint pipe 54e described later. The S connection flow path 17 is communicated with the suction hole of the compressor via the S port 27, the S communication path 55, and the S joint pipe 55s described later. The C connection flow path 18 is communicated with the outdoor heat exchanger (condenser or evaporator) via the C switching port 28, the C communication path 56, and the C joint pipe 56c described later. As shown in FIG. 2 , a plate-shaped wall portion 19 protruding toward the upper side Z1 is formed on the inner peripheral surface of the side wall 12, on the inner peripheral surface of the lower side Z2 (the inner peripheral surface on the side where the E connecting flow path 16, the S connecting flow path 17, and the C connecting flow path 18 are formed). The wall portion 19 is formed between the opening 12a and the E connecting flow path 16. That is, the wall portion 19 is vertically provided on the inner peripheral surface of the side wall 12 between the opening 12a and the bottom wall 11. The surface of the wall portion 19 facing the other side L2 is in close contact with the front end surface 25 facing the one side L1 of a pair of front end surfaces 25 of the valve seat member 21 described later.

As shown in FIG. 1 , a connection portion 60 is provided at the opening end edge of the opening portion 12a of the valve body 10. The connection portion 60 is a metal component that connects the valve body 10 to the housing 41a described later. The connection portion 60 includes a substantially cylindrical lower cover 61 and a substantially cylindrical upper cover 62 connected to the lower cover 61. The end edge of the other side L2 of the lower cover 61 is insert-molded along the axis L direction relative to the valve body 10. The opening end edge of the other side L2 of the upper cover 62 is formed by expanding the diameter in the radial direction, and the opening end edge of the other side L2 is fixed to the opening end edge of one side L1 of the lower cover 61 by welding. On the other hand, the opening end edge of one side L1 of the upper cover 62 is fixed to the opening end edge of the other side L2 of the housing 41a by welding.

The valve body 10 and the connection part 60 formed in this way are accommodated in the housing 50. The housing 50 has a receiving hole 51 at the center portion which is coaxial with the axis L and has an inner diameter larger than the outer diameter of the valve body 10, and the valve body 10 and the connection part 60 are inserted into the receiving hole 51 along the axis L direction in a state where a gap is generated in the radial direction. In addition, in FIG. 1, the symbol G is a groove formed at a plurality of positions in the axis L direction at a predetermined interval on either the outer peripheral wall of the valve body 10 or the inner peripheral wall of the receiving hole 51, and the symbol 50a is a sealing member such as an O-ring disposed in the groove G. And the symbol 50b is a retaining ring which abuts against the upper cover 62 and restricts the movement of the valve body 10 to one side L1.

A D connecting passage 53 communicating with the D port 14 and the D connecting passage 14d is formed on the bottom wall of the shell 50. A D joint pipe 53d is connected to the D connecting passage 53. An E connecting passage 54, an S connecting passage 55, and a C connecting passage 56 are formed in sequence along the axis L direction from one side L1 as a plurality of connecting passages communicating with the E connecting passage 16, the S connecting passage 17, and the C connecting passage 18, respectively. An E joint pipe 54e is connected to the E connecting passage 54, an S joint pipe 55s is connected to the S connecting passage 55, and a C joint pipe 56c is connected to the C connecting passage 56. These E joint pipe 54e, S joint pipe 55s, and C joint pipe 56c are refrigerant pipes for the refrigerant to flow. That is, the shell 50 is connected with the refrigerant pipes.

The valve seat portion 20 is a portion where the valve core 30 is seated and in sliding contact, and is configured to include a valve seat component 21, which is provided on the side wall 12 of the valve body 10 where the E connection flow path 16, the S connection flow path 17, and the C connection flow path 18 are formed. The valve seat portion 20 is formed of a metal component such as a magnetic material, and is fixed to the side wall 12 of the valve body 10 (resin forming the valve body 10) by insert molding and integrated. As shown in Figures 4 (A) to 4 (C), the valve seat component 21 includes: a sliding contact surface 22 that is a plane for the valve core 30 to slide in contact with; a curved surface 23 that is curved and convex to the side opposite to the sliding contact surface 22; a pair of side end surfaces 24 that connect the side end edges of the sliding contact surface 22 and the curved surface 23 to each other; and a pair of front end surfaces 25 that constitute both ends in the direction of the axis L.

The sliding contact surface 22 is a so-called sealing surface, and extends in the axis L direction and the width direction Y. The curved surface 23 is curved in a manner that is convex toward the lower side Z2. A pair of side end surfaces 24 extend in the up-down direction Z and connect the sliding contact surface 22 and the curved surface 23. As shown in FIG3, the curved surface 23 and the pair of side end surfaces 24 are in close contact with the inner peripheral surface of the side wall 12 of the valve body 10. That is, the curved surface 23 and the side end surfaces 24 constitute a close contact surface a that is in close contact with the inner peripheral surface of the valve body 10. As shown in FIG3, the surface area of the close contact surface a is larger than the surface area of the sliding contact surface 22. A pair of front end surfaces 25 extend in the up-down direction Z in the same manner as the pair of side end surfaces 24 and connect the sliding contact surface 22 and the curved surface 23. As shown in FIG2, the front end surface 25 (one side) located on the other side L2 of the pair of front end surfaces 25 is in close contact with the bottom wall 11 of the valve body 10. In addition, the front end face 25 (the other side) located on the one side L1 of the pair of front end faces 25 is in close contact with the wall portion 19 of the valve body 10. Rough surfaces are formed on at least a portion of the curved surface 23, the pair of side end faces 24, and the pair of front end faces 25. The rough surfaces are formed using a technique such as chemical treatment, laser irradiation, sputtering, etc., thereby increasing the contact area with the resin when the valve seat member 21 is insert-molded.

A plurality of valve ports are formed on the plate surface of the valve seat member 21 (plate surface of the valve seat portion 20) so as to pass through from the sliding contact surface 22 to the curved surface 23. The plurality of valve ports are composed of an E switching port 26 communicating with the E connecting flow path 16, an S port 27 communicating with the S connecting flow path 17, and a C switching port 28 communicating with the C connecting flow path 18. As shown in FIG. 1, each valve port 26, 27, 28 is communicated with the corresponding refrigerant pipe 54e, 55s, 56c via the above-mentioned connecting flow paths 16, 17, 18 and the communicating paths 54, 55, 56. In addition, at this time, as described above, the inner diameter of the storage hole 51 of the shell 50 is larger than the outer diameter of the valve body 10, so a radial gap is generated between the valve body 10 and the shell 50. Therefore, each valve port 26, 27, 28 can be communicated with the refrigerant pipe 54e, 55s, 56c via the gap between the valve body 10 and the shell 50. Specifically, the E switching port 26 communicates with the E joint pipe 54e via the gap between the E connecting flow path 16 and the E communicating path 54. The S port 27 communicates with the S joint pipe 55s via the gap between the S connecting flow path 17 and the S communicating path 55. The C switching port 28 communicates with the C joint pipe 56c via the gap between the C connecting flow path 18 and the C communicating path 56.

The valve core 30 is mainly made of a resin such as polyphenylene sulfide (PPS), and is slidably provided inside the valve body 10 along the axis L direction. The valve core 30 is configured to switch the communication state of the above-mentioned D port 14, E switching port 26, S port 27, and C switching port 28. In the present embodiment, it is configured to include a valve core body 31 that is in sliding contact with the sliding contact surface 22 of the valve seat portion 20. The valve core body 31 is formed in a bowl shape that opens toward the sliding contact surface 22, and a bowl-shaped recessed portion 32 that serves as a flow path for the fluid is formed inside. The opening end edge of the valve core body 31 serves as a sealing portion 33 that is in sliding contact with the sliding contact surface 22, and its dimension and width dimension in the axis L direction are set to cover two adjacent ports among the E switching port 26, S port 27, and C switching port 28. A hook portion 34 that protrudes toward the one side L1 and opens toward the upper side Z1 is formed at the end of the one side L1 of the valve core body 31.

The hook portion 34 is a portion for connecting the valve core 30 to the drive unit 40. The hook portion 34 is fixed to the drive unit 40 by a fixing pin 49 disposed on the hook-shaped portion and a clamp (not shown) that surrounds and tightens the connecting arm portion 48 and the hook portion 34 in the circumferential direction while being sandwiched by two connecting arms 48 of the female thread member 44 of the drive unit 40. A stopper 35 that protrudes downward in the direction of the axis L is formed at the end portion on the other side L2 of the valve core body 31. The stopper 35 restricts the movement of the valve core body 31 to the other side L2 by abutting the surface of the bottom wall 11 of the valve body 10 on the side of the valve chamber 13 at its protruding end. A biasing member 36 that biases the valve core 30 toward the valve seat portion 20 is provided between the front end surface of the top (end portion on the upper side Z1) of the valve core body 31 and the inner peripheral surface of the valve body 10. The biasing member 36 is, for example, a leaf spring formed by stamping or the like using a metal material such as phosphor bronze. The seal portion 33 of the valve body 31 is pressed against the sliding contact surface 22 by being urged by the urging member 36 , thereby suppressing valve leakage.

The drive unit 40 is a part that drives the valve core 30 to slide, and includes a stepping motor 41 and a direct-acting mechanism 42 that converts the rotation of the stepping motor 41 into a linear motion and transmits it to the valve core 30. As shown in FIG1 , the stepping motor 41 includes: a housing 41a that is fixed to the opening edge of one side L1 of the upper cover 62 (arranged on one end side of the axis L direction of the valve body 10) to seal the inside of the drive unit 40; an electromagnetic rotor 41b built into the housing 41a; and an electromagnetic coil 41c that surrounds the outer periphery of the electromagnetic rotor 41b in the circumferential direction through the housing 41a. The housing 41a is formed into a bottomed cylindrical shape using a thin plate-like metal material, and is arranged in a manner that the central axis is coaxial with the axis L and the opening edge faces the other side L2, and its opening edge is fixed to the opening edge of one side L1 of the upper cover 62 by welding.

The direct-acting mechanism 42 includes: a bearing component 42a, which is arranged inside the one side L1 of the housing 41a; a guide component 42b, which is fixed to the inner peripheral wall of the upper cover 62; a drive shaft 43 as a drive shaft, which is fixed to the center of the electromagnetic rotor 41b; and an internal thread component 44, which has an internal thread 44a that is screwed with the external thread 43a formed on the outer peripheral surface of the drive shaft 43. That is, the direct-acting mechanism 42 is configured as a thread feed mechanism having the external thread 43a and the internal thread 44a that are screwed with each other. The bearing component 42a is a component that supports the drive shaft 43 rotatably along the axis L direction, and is formed in a disc shape. The bearing component 42a is inserted into the housing 41a in a manner that the central axis is coaxial with the axis L of the valve body 10. In the bearing component 42a, a first bearing hole 42a1 that opens toward the other side L2 is formed at the axial center position of the drive shaft 43, that is, the center. The end of the one side L1 of the drive shaft 43 is inserted into the first bearing hole 42a1.

The guide member 42b includes a main body 45 formed in a bottomed cylindrical shape, and a cover portion 46 protruding radially outward from the main body 45 and fitted into the opening portion 12a of the valve body 10. The main body 45 is fixed to the inner peripheral wall of the upper cover 62 in a manner such that the front end portion is located on one side L1 and the bottom portion is located on the other side L2. The main body 45 is arranged so that the central axis is coaxial with the axis L of the valve body 10. With this arrangement, the housing 41a, the bearing member 42a, and the guide member 42b are all arranged so that the central axis is coaxial with the axis L of the valve body 10. A second bearing hole 45a is formed at the center of the main body 45, which is opposite to the first bearing hole 42a1 in the direction of the axis L. The end portion on the other side L2 of the drive shaft 43 is inserted into the second bearing hole 45a.

A pair of guide holes (not shown) are formed around the second bearing hole 45a on the bottom wall of the main body 45, through which the connecting arm portion 48 of the internal thread member 44 can be inserted so as to advance and retreat in the direction of the axis L. The guide holes are holes that penetrate in the direction of the axis L, so as to prevent the internal thread member 44 from rotating around the axis L and to guide the internal thread member 44 to advance and retreat in the direction of the axis L. The cover portion 46 includes a side wall portion 46a extending in the up-down direction Z, and the outer peripheral surface of the side wall portion 46a is fitted with the inner peripheral surface of the opening portion 12a of the valve main body 10. That is, the drive portion 40 is inserted into the valve main body 10 in a manner that is fitted with the inner peripheral surface of the valve main body 10. The drive shaft 43 is fixed to the center portion of the electromagnetic rotor 41b, extends in the direction of the axis L, and is configured to rotate around the axis L integrally with the electromagnetic rotor 41b. As described above, the outer peripheral surface of the drive shaft 43 is formed with an external thread 43a. The end portion of the drive shaft 43 on one side L1 is inserted into the first bearing hole 42a1 , and the end portion of the drive shaft 43 on the other side L2 is inserted into the second bearing hole 45a , whereby the drive shaft 43 is rotatably supported about the axis L.

The internal thread member 44 includes: a cylindrical base end portion 47 which is accommodated in the guide member 42b and whose outer peripheral wall is in sliding contact with the inner peripheral wall of the guide member 42b; and two connecting arm portions 48 which extend from the base end portion 47 to the other side L2 and extend into the valve chamber 13 through the above-mentioned guide hole. The central axis of the base end portion 47 is coaxial with the central axis of the guide member 42b. An internal thread 44a is formed at the center of the base end portion 47 along the axis L. The internal thread 44a is screwed with the external thread 43a and can move forward and backward along the axis L direction coaxially with the central axis as the drive shaft 43 rotates. The connecting arm portions 48 extend from a part of the peripheral portion of the base end portion 47 through the above-mentioned guide hole to the valve chamber 13. The plate surfaces of the front end portions of each connecting arm portion 48 are opposed to each other, and a fixing pin 49 is fixed to the front end portions of the plate surfaces which are opposed to each other and penetrates the plate surfaces together in the plate thickness direction.

In such a structure, when the drive shaft 43 rotates around the axis L by the drive of the stepping motor 41, the internal thread member 44 moves in the direction of the axis L with the rotation. As a result, the valve core 30 fixed to the connecting arm 48 of the internal thread member 44 also moves in the direction of the axis L with the movement of the internal thread member 44. And, the connection state of each valve port 14, 26, 27, 28 is switched by the valve core body 31 of the valve core 30. For example, in the state shown in FIG. 1, the E switching port 26 is connected to the S port 27 through the bowl-shaped recessed portion 32 of the valve core body 31, and the D port 14 is connected to the C switching port 28 outside the valve core body 31. If the valve core body 31 is moved to the other side L2 by the drive of the stepping motor 41 from here, the C switching port 28 and the S port 27 are connected through the bowl-shaped recessed portion 32 of the valve core body 31, and the D port 14 and the E switching port 26 are connected outside the valve core body 31.

As described above, according to the present embodiment, the valve seat member 21 has a close contact surface a including a curved surface 23 that is curved and convex in the opposite direction of the sliding contact surface 22, so that the wall thickness (dimension in the vertical direction Z) can be increased compared to the valve seat member 21 made of a thin metal plate, and its rigidity can be improved. Therefore, even if the valve body 10 is deformed due to the pressure difference between the inside and the outside, the valve seat member 21 can be suppressed from deforming along with the deformation. In addition, the close contact surface a including the curved surface 23 of the valve seat member 21 is in close contact with the inner peripheral surface of the side wall 12 (cylindrical portion) in the valve body 10, so that the close contact area becomes larger than that of the valve seat member 21 made of a thin metal plate, and the fixing strength of the valve seat member 21 relative to the valve body 10 can be improved, and the valve seat member 21 can be suppressed from peeling off from the valve body 10. Therefore, it is possible to provide a sliding type switching valve 1 that improves the valve leakage performance by improving the fixing strength of the valve seat member 21 relative to the valve body 10 and suppressing the deformation and peeling of the valve seat member 21. Furthermore, since the curved surface 23 of the valve seat member 21 can be provided along the inner peripheral surface of the valve body 10 , the wall thickness of the valve seat member 21 can be increased without changing the overall size of the slide type switching valve 1 , and the size increase of the slide type switching valve 1 can be suppressed.

In addition, the close contact surface a of the valve seat member 21 is in close contact with the inner peripheral surface of the side wall 12 in the valve body 10, the front end surface 25 (one side) of the pair of front end surfaces 25 located on the other side L2 is in close contact with the bottom wall 11, and the front end surface 25 (the other side) of the pair of front end surfaces 25 located on the one side L1 is in close contact with the wall portion 19 of the valve body 10. Thus, by making the portion other than the sliding contact surface 22 of the valve seat member in close contact with the structure on the valve body 10 side, the contact area between the valve seat member 21 and the valve body 10 can be increased in the axis L direction and the width direction Y, and the fixing strength of the valve seat member 21 to the valve body 10 can be improved. Therefore, it is possible to suppress the valve seat member 21 from peeling off from the valve body 10 accompanying the deformation of the valve body 10.

The drive unit 40 is inserted into the valve body 10 so as to fit into the inner peripheral surface of the valve body 10. With such a structure, for example, when the outer shape of the drive unit 40 is formed in a cylindrical shape, the drive unit 40 can be easily fitted into the opening 12a to assemble the slide type switching valve 1.

In addition, a plate-like protrusion 15 is formed on the wall surface on the valve chamber 13 side of the bottom wall 11 of the valve body 10, which protrudes toward the opening 12a side in the direction of the axis L, and the surface of the protrusion 15 facing the lower side Z2 is in close contact with the sliding contact surface 22 of the valve seat member 21. In addition, the curved surface 23 and the pair of side end surfaces 24 are in close contact with the inner peripheral surface of the side wall 12 of the valve body 10. According to such a structure, the valve seat member 21 can be fixed in a manner of clamping in the vertical direction Z by the protrusion 15 in close contact with the sliding contact surface 22 and the inner peripheral surface of the side wall 12 in close contact with the curved surface 23, so that the fixing strength of the valve seat member 21 relative to the valve body 10 can be further improved.

In addition, since a rough surface is formed on at least a portion of the curved surface 23, a pair of side end surfaces 24, and a pair of front end surfaces 25, the contact area between the resin and the metal can be increased by the projections and depressions of the rough surface, thereby further improving the fixing strength of the valve seat component 21 relative to the valve body 10 through the so-called anchoring effect.

In addition, the valve seat component 21 can be formed by a metal component such as a magnetic material. Therefore, when the valve seat component 21 is insert-molded, the valve seat component 21 can be easily fixed to the mold by installing a magnet or the like into the mold, and the positioning accuracy of the valve seat component 21 can be easily improved.

In addition, the valve body 10 and the connection portion 60 are accommodated in the housing 50. According to such a structure, the pressure resistance of the valve body 10 can be improved by the housing 50 that accommodates the valve body 10, so the resin itself that constitutes the valve body 10 can be made thinner. In addition, for example, by making the housing 50 made of metal, the E joint pipe 54e, the S joint pipe 55s, and the C joint pipe 56c (refrigerant piping, respectively) can be easily connected to the housing 50 by brazing, welding, etc., and the difficulty of joining the resin valve body 10 made of different materials and the metal refrigerant piping can be avoided. In addition, according to such a structure, the refrigerant piping is connected to the housing 50 and is not directly connected to the valve body 10, so the valve body 10 can be easily detached from the housing 50, which can help improve the maintainability.

As mentioned above, although embodiment of the present invention is described in detail with reference to drawings, the specific structure is not limited to these embodiments, and the design change etc. which do not deviate from the summary of the present invention are also included in the present invention.

FIG5 is a cross-sectional view of the valve body 10 and the valve seat portion 20 in the first variant in a direction orthogonal to the axis L. FIG6 is an enlarged cross-sectional view of area A in FIG5 . In the first variant, the structure near the two end portions in the width direction Y of the valve seat component 21 is different from that in the above-mentioned embodiment. Specifically, a pair of guide portions 12b are formed on the inner peripheral surface of the side wall 12 of the valve body 10, which are opposed to each side end surface 24 of the valve seat component 21 with a gap in the width direction Y. The guide portion 12b is composed of a wall surface that can be in sliding contact with the two end portions in the width direction Y of the above-mentioned valve core body 31, extends in the direction of the axis L, and guides the valve core body 31 (valve core 30) to slide in the direction of the axis L through the above-mentioned sliding contact. As shown in FIG6 , in the first modified example, the lower side Z2 (the side where the curved surface 23 is located) portion of the side end surface 24 of the valve seat member 21 constitutes a close contact portion 24a (close contact surface a) that is in close contact with the inner peripheral surface of the side wall 12 (valve body 10), and the upper side Z1 (the side where the sliding contact surface 22 is located) portion is not in close contact with the valve body 10 and becomes an exposed portion 24b. In addition, as shown in FIG6 , a space S is formed between the guide portion 12b and the exposed portion 24b.

According to such a structure, for example, even if the valve core body 31 is ground and foreign matter is generated due to the sliding of the valve core body 31 (valve core 30) and the valve seat component 21, the foreign matter can be released and stored between the guide portion 12b and the exposed portion 24b. Therefore, it is possible to prevent the valve core body 31 from tilting due to the collision with the foreign matter, thereby preventing the valve leakage from occurring accidentally. In addition, according to such a structure, in the portion of the space S between the guide portion 12b and the exposed portion 24b, for example, a part of the mold can be arranged when the valve seat component 21 is embedded in the molding. That is, the valve seat component 21 can be guided in a manner of clamping the valve seat component 21 by the mold that respectively abuts against the pair of side end faces 24, so that the positioning accuracy of the valve seat component 21 relative to the valve body 10 can be improved. The improvement of this positioning accuracy is described in detail.

FIG. 7 (A), FIG. 7 (B), and FIG. 8 are diagrams showing a method for manufacturing the valve body 10 and the valve seat portion 20 of the first modified example. Here, the symbol M is a mold center pin mainly used to form the side wall 12 of the valve body 10. The mold center pin M is arranged at a portion where the valve chamber 13 is formed when the valve seat component 21 is insert-molded. At this time, the valve seat component 21 needs to be fixed to the mold center pin M, but the mold center pin M is often used in an upright state with one side L1 facing upward and the other side L2 facing downward. Therefore, due to gravity, the valve seat component 21 falls off from the mold center pin M, etc., making it difficult to position the valve seat component 21. In addition, if the position of the valve seat component 21 is shifted or falls off during the insert molding stage, in addition to the performance of the slide-type switching valve 1 as a valve being reduced, there is also a concern that the mold center pin M may be damaged due to the falling off of the valve seat component 21. However, in this structure, the mold center pin M is formed with a claw portion M1 that abuts against and clamps the side end surface 24 of the valve seat component 21.

Therefore, as shown in FIG. 7(B) and FIG. 8, if the valve seat component 21 is provided on the mold center pin M, as shown in FIG. 7(A), the valve seat component 21 is clamped by the claw portion M1 from the outside toward the inside in the width direction Y. Thus, it is possible to prevent the valve seat component 21 from falling off, and to stably determine the position of the valve seat component 21. In addition, in this case, a magnet not shown in the figure may be buried in the portion of the mold center pin M that abuts against the sliding contact surface 22 of the valve seat component 21. Thus, in the case where the valve seat component 21 is formed of a magnetic body, the valve seat component 21 can be fixed to the mold center pin M by the magnetic force of the magnet, so that the positioning accuracy of the valve seat component 21 can be further improved.

Next, a second modification of the slide-type switching valve 1 will be described. FIG. 9 is a cross-sectional view of the valve body 10 and the valve seat portion 20 in the second modification in a direction orthogonal to the axis L. FIG. 10 is an enlarged cross-sectional view of the area B in FIG. 9 . In the second modification, a step surface 24c protruding outward in the width direction Y is formed on the valve seat member 21. The step surface 24c protrudes outward in the width direction Y from the lower end of the close contact portion 24a in each side end surface 24. That is, the side end surface 24 is provided with a step surface 24c extending outward in the width direction Y intersecting the axis L direction on the side where the curved surface 23 is located. As shown in FIG. 10 , the protruding portion 12c in the side wall 12 of the valve body 10 protruding inward in the width direction Y from the lower end of the guide portion 12b is in close contact with the step surface 24c. That is, the side wall 12 in the valve body 10 is in close contact with the step surface 24c, and the step surface 24c constitutes a part of the close contact surface a. According to such a structure, in the valve seat member 21, the step surface 24c and the curved surface 23 are in close contact with the side wall 12 of the valve body 10. Therefore, the valve seat member 21 is clamped by the side wall 12 in the plate thickness direction, and is more difficult to be displaced in the same direction, which can further improve the fixing strength of the valve seat member 21 in the same direction.

Next, a second embodiment of the slide-type switching valve 1 will be described. FIG. 11 is a cross-sectional view of the valve body 10 and the valve seat portion 20 in the second embodiment in the direction of the axis L. FIG. 12 is an enlarged cross-sectional view of the area C of FIG. 11. FIG. 13 is a perspective view of the valve seat portion 20 in the second embodiment. In the second embodiment, the structure near each valve port 26, 27, and 28 is different from that in the above-mentioned embodiment and the modified example. In addition, the shape of the valve seat portion 20 is different from that in the above-mentioned embodiment and the modified example. Specifically, as shown in FIG. 11, the peripheral edge portion of the lower side Z2 of the E switching port 26, the S port 27, and the C switching port 28 is formed with: an enlarged diameter portion 29a having an inner diameter larger than the inner diameter of the E switching port 26, the S port 27, and the C switching port 28, and opening to the lower side Z2 (the opposite side of the sliding contact surface 22); and a step portion 29b, which is formed from the enlarged diameter portion 29a toward the inner side (inner diameter side) in the width direction Y.

As shown in FIG. 12 , the resin of the side wall 12 (valve body 10) constituting the inner wall surface of the E connecting flow path 16 , the S connecting flow path 17 , or the C connecting flow path 18 is in close contact with the inner peripheral surface of the expanded diameter portion 29a and a part of the step portion 29b. That is, the inner peripheral surface of the expanded diameter portion 29a constitutes a part of the close contact surface a. Furthermore, as shown in FIG. 13 , a flat surface 23a formed by cutting off the convex portion of the curved surface 23 is formed at the end portion of the lower side Z2 of the curved surface 23 of the valve seat member 21. The flat surface 23a is provided in parallel with the sliding contact surface 22 and extends in the axis L direction and the width direction Y. Although not shown in the figure, the flat surface 23a is provided in close contact with the inner peripheral surface of the side wall 12 in the valve body 10 together with the curved surface 23. That is, the flat surface 23a constitutes a part of the close contact surface a.

According to such a structure, in the valve seat member 21, the inner peripheral surface of the enlarged diameter portion 29a, the curved surface 23, the side end surface 24, and the front end surface 25 are all in close contact with the side wall 12 of the valve body 10. Therefore, the portion of the valve seat member 21 extending in the axial direction between the enlarged diameter portion 29a and the front end surface 25 is difficult to be displaced in the direction of the axis L, thereby further improving the fixing strength of the valve seat member 21 in the same direction. In addition, according to such a structure, for example, when insert molding the valve seat member 21, the resin can be injected in a state where the valve ports 26, 27, and 28 are closed by pressing the cylindrical pin-shaped mold against the step portion 29b, thereby molding the valve body 10. Therefore, the resin can be prevented from intruding into the valve ports 26, 27, and 28 and the sliding contact surface 22 side.

In this case, the outer diameter of the cylindrical pin-shaped mold can be set larger than the inner diameter of the valve ports 26, 27, 28 and smaller than the inner diameter of the enlarged diameter portion 29a. By setting in this way, even if the position of the cylindrical pin-shaped mold is slightly offset during insert molding of the valve seat member 21, it is possible to prevent the valve ports 26, 27, 28 from being completely blocked by the mold. In addition, it is possible to prevent the inner wall shape of the E-connecting flow path 16, the S-connecting flow path 17, or the C-connecting flow path 18 from being deformed due to the mold accidentally contacting the enlarged diameter portion 29a.

In addition, since a flat surface 23a parallel to the sliding contact surface 22 is formed on the opposite side of the sliding contact surface 22, the curved surface 23 side of the valve seat member 21 can be processed more easily than a structure in which the flat surface 23a is not formed. Specifically, for example, even if a tool such as a drill is pressed on the curved surface 23 side, the tool is unlikely to slide, and the hole opening operation from the curved surface 23 side to the sliding contact surface 22 side can be easily and accurately performed. Therefore, the processability when forming the valve ports 26, 27, and 28 in the valve seat member 21 can be improved.

In addition, the above-mentioned one embodiment, the first variant, the second variant and the second embodiment merely illustrate representative modes of the present invention, and the present invention is not limited thereto. That is, it is possible to implement the present invention by various modifications within the scope of the main purpose of the present invention. For example, one embodiment, the first variant, the second variant and the second embodiment may be combined respectively, or all of these embodiments and variants may be combined. Specifically, the valve body 10 may include a protrusion 15 of one embodiment, a guide portion 12b of the first variant and a protrusion 12c of the second variant. In addition, the valve seat portion 20 may include a close contact portion 24a and an exposed portion 24b of the first variant, a stepped surface 24c of the second variant, an enlarged diameter portion 29a and a stepped portion 29b of the second embodiment, and a flat surface 23a. Furthermore, such a valve body 10 and a valve seat portion 20 may also be used to constitute a sliding switching valve 1. In addition, on the contrary, the protrusion 15, the guide portion 12b and the protrusion 12c can be omitted from the valve body 10, and the close contact portion 24a, the exposed portion 24b, the stepped surface 24c, the enlarged diameter portion 29a, the stepped portion 29b and the flat surface 23a can be omitted from the valve seat member 21.

Claims (11)

1. A sliding type switching valve is provided with: a hollow cylindrical valve body; a valve seat portion provided to the valve main body; a valve body slidably provided in the valve body in an axial direction; and a driving unit for slidably driving the valve element, wherein,

The valve seat portion has a metal valve seat member integrated with a resin forming the valve body by insert molding,

The valve seat member has: a sliding contact surface which is a plane in which the valve element is in sliding contact; an abutting surface including a curved surface that is convex to a side opposite to the sliding contact surface; and a plurality of valve ports penetrating from the sliding contact surface to the contact surface,

The surface area of the close contact surface is larger than the surface area of the sliding contact surface,

The contact surface of the valve seat member is provided in contact with an inner peripheral surface of the valve body.

2. The sliding type switching valve according to claim 1, wherein,

The valve body has: a cylindrical portion; an opening portion that opens on a side where the driving portion is located; a bottom portion provided on a side opposite to the side on which the driving portion is provided; and a wall portion provided upright on an inner peripheral surface of the tube portion between the opening portion and the bottom portion,

The valve seat member includes: a pair of side end surfaces connecting side end edges of the sliding contact surface and the curved surface to each other; and a pair of front end surfaces which constitute both end portions in the axial direction,

The curved surface and the side end surface constitute the close contact surface,

One of the pair of front end surfaces is in close contact with the bottom portion, and the other of the pair of front end surfaces is in close contact with the wall portion.

3. The sliding type switching valve according to claim 2, wherein,

The opening portion has a circular inner peripheral surface, and the driving portion is inserted so as to be fitted to the inner peripheral surface.

4. The sliding type switching valve according to claim 2, wherein,

The valve main body has a protruding portion protruding from the bottom portion toward the opening portion,

The protruding portion is in close contact with the sliding contact surface of the valve seat member.

5. The sliding type switching valve according to claim 1, wherein,

The valve port has: an enlarged diameter portion that opens on the opposite side of the sliding contact surface; and a step portion extending from the diameter-enlarged portion toward the inner diameter side,

The inner peripheral surface of the expanded diameter portion constitutes a part of the contact surface.

6. The sliding type switching valve according to claim 5, wherein,

The valve seat member has a flat surface parallel to the sliding contact surface on the opposite side of the sliding contact surface,

The flat surface forms a part of the contact surface.

7. The sliding type switching valve according to claim 2, wherein,

A rough surface is formed on at least a part of the curved surface, the pair of side end surfaces, and the pair of front end surfaces.

8. The sliding type switching valve according to claim 2, wherein,

The side end surface is formed as a part of the contact surface on the side where the curved surface is located, and the side where the sliding contact surface is located is not in contact with the valve main body but is an exposed portion,

The valve body has a guide portion that slidably guides the valve body, and a space is formed between the guide portion and the exposed portion.

9. The sliding type switching valve according to claim 2, wherein,

A step surface extending outward in the width direction intersecting the axis direction is provided on the side of the side end surface where the curved surface is located,

The step surface constitutes a part of the contact surface.

10. The sliding type switching valve according to claim 1, wherein,

The valve seat member is formed of a magnetic material.

11. The sliding type switching valve according to any one of claims 1 to 10, wherein,

The valve body is accommodated in a housing connected to a refrigerant pipe with a gap therebetween,

The valve port and the refrigerant pipe can communicate with each other through a gap between the valve body and the housing.