Slide type switching valve

Abstract

To obtain a slide type switching valve capable of suppressing deformation of an urging member to a predetermined amount or less by a deformation restriction part even when a valve body is displaced greatly by a load exceeding assumption, and capable of preventing an excessive load from acting on the urging member.SOLUTION: A slide type switching valve 1 comprises a hollow cylindrical valve body 2, a valve seat part 3 having one or more valve ports 30, 31, 32, a valve element 4 provided inside the valve body 2, and an urging member 6 that urges the valve element 4 toward the valve seat part 3. Between the valve element 4 and the valve body 2, provided is a deformation restriction part 7 that extends from at least one of a part of the valve element 4 and an inner peripheral surface of the valve body 2 to the other and restricts the urging member 6 from being deformed beyond a predetermined deformation amount.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a slide type switching valve. [Background technology]

[0002] As a valve device used in a refrigeration cycle or the like, a slide-type switching valve is known that has a valve seat portion having a valve port, and switches the communication state of the valve port by a valve body that is slidable in the axial direction on the valve seat portion. Among them, as a switching valve that switches the flow path of a refrigerant, a slide-type switching valve that includes a cylindrical valve body, a bowl-shaped valve body that is slidable inside the valve body, and a valve seat portion that is fixed to the valve body and has a plurality of valve ports is known (see, for example, Patent Document 1). A biasing member is fixed to the valve body of the slide-type switching valve described in Patent Document 1, and the biasing member biases the valve body toward the valve seat portion, thereby applying contact pressure between the seat surface of the valve body and the valve seat portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 62-200155 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned slide-type switching valve, if the valve disc is significantly displaced in a direction away from the valve seat due to a load greater than expected, such as an impact pressure blowing up from inside the valve disc, the biasing member may be deformed beyond its elastic range, and the desired biasing force may not be obtained.

[0005] The present invention aims to provide a slide-type switching valve that can prevent excessive load from acting on the biasing member by restricting deformation of the biasing member to a predetermined amount or less using a deformation control portion even if the valve body is about to be significantly displaced by a load exceeding that expected. [Means for solving the problem]

[0006] The slide type switching valve of the present invention is a slide type switching valve including a hollow cylindrical valve body, a valve seat portion having one or more valve ports provided in the valve body, a valve body provided inside the valve body so as to be slidable in the axial direction on the valve seat portion and switching the communication state of the valve port, and a biasing member biasing the valve body toward the valve seat portion, wherein a deformation restricting portion is provided between the valve body and the valve body, the deformation restricting portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve body to the other, and restricting the biasing member from deforming beyond a predetermined deformation amount, and a front-side deformation is prevented by a clearance between the deformation restricting portion and either the inner circumferential surface of the valve body or the outer circumferential surface of the valve body. a predetermined deformation amount of the biasing member is specified, the valve body has a seal portion that slides against the seal surface of the valve seat portion and an apex portion opposite the seal portion, the deformation regulating portion is provided extending from the apex portion of the valve body toward the inner circumferential surface of the valve body, the biasing member has an attachment portion attached to the apex portion of the valve body, an extension portion that rises from the attachment portion, and a contact portion that is provided at a tip of the extension portion and is capable of contacting the inner circumferential surface of the valve body, and the deformation regulating portion is provided upstream of the biasing member in the fluid flow direction inside the valve body and is provided overlapping with the attachment portion and the extension portion of the biasing member in the fluid flow direction.

[0007] According to the present invention, the valve body provided inside the valve body is biased toward the valve seat by the biasing member. Therefore, the biasing force of the biasing member presses the valve body against the seal surface of the valve seat, making it difficult for a gap to occur between the seal surface and the valve body, and airtightness inside the valve body can be ensured. In addition, a deformation restriction portion is provided between the valve body and the valve body, extending from at least one of a part of the valve body and the inner circumferential surface of the valve body to the other, and restricts the deformation of the biasing member from exceeding a predetermined deformation amount. Therefore, even if a load exceeding an expected value, such as an impact pressure blowing up from inside the valve body, acts on the valve body, the deformation of the biasing member can be limited to a predetermined deformation amount, thereby suppressing the valve body from being significantly displaced in a direction away from the valve seat. Therefore, even if the valve body is about to be significantly displaced by a load exceeding an expected value, the deformation restriction portion can suppress the deformation of the biasing member to a predetermined amount or less, and a slide-type switching valve can be obtained in which an excessive load is prevented from acting on the biasing member. In addition, with this configuration, the predetermined deformation amount of the biasing member is determined by the clearance between the deformation restricting portion and either the inner circumferential surface of the valve body or the outer circumferential surface of the valve disc. Therefore, in the state before the biasing member deforms to the predetermined deformation amount, i.e., in the normal state, the displacement of the valve disc is not restricted by the deformation restricting portion, so that the valve disc can slide smoothly in the axial direction without impairing its slidability against the valve seat. Furthermore, with this configuration, the deformation restriction portion extending from the top of the valve body toward the inner circumferential surface of the valve body can restrict deformation of the biasing member from exceeding a predetermined deformation amount. Furthermore, with this configuration, the deformation restricting portion is provided upstream of the biasing member in the fluid flow direction inside the valve body, and is provided overlapping with the attachment portion and extension portion of the biasing member in the fluid flow direction. Therefore, the flow velocity of the high-pressure fluid flowing inside the valve body is first reduced by the deformation restricting portion provided upstream, and the force of the fluid against the attachment portion and extension portion of the biasing member on the downstream side can be suppressed, thereby protecting the biasing member.

[0008] a valve seat portion having one or more valve ports provided in the valve body; a valve element provided inside the valve body so as to be slidable in the axial direction on the valve seat portion and switching the communication state of the valve port; and a biasing member biasing the valve element toward the valve seat portion, wherein a deformation restricting portion is provided between the valve element and the valve body, the deformation restricting portion extending from at least one of a part of the valve element and an inner circumferential surface of the valve body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount, the predetermined deformation amount of the biasing member is determined by a clearance between the deformation restricting portion and either the inner circumferential surface of the valve body or the outer circumferential surface of the valve element, and a guide portion is provided inside the valve body, the guide portion rises from a seal surface of the valve seat portion and extends in the axial direction, and guides the valve element in the axial direction, and the clearance is set to be smaller than a height dimension of the guide portion. According to this configuration, the above-mentioned clearance is set smaller than the height dimension of the guide part, so even if an unexpected load such as an impact pressure blowing up from inside the valve body acts on the valve body and the valve body is significantly displaced in a direction away from the valve seat, the valve body can be prevented from displacing in the same direction beyond the height dimension of the guide part. This prevents the valve body from riding up onto the guide part, thereby allowing the guide part, which properly maintains the positions of the valve body and the valve port, to function normally and ensuring the sliding movement of the valve body.

[0009] The present invention also provides a slide type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve element provided inside the valve body so as to be slidable in the axial direction on the valve seat portion and switching the communication state of the valve port; and a biasing member for biasing the valve element toward the valve seat portion, wherein between the valve element and the valve body, there is provided a biasing member extending from at least one of a part of the valve element and an inner circumferential surface of the valve body to the other and capable of deforming beyond a predetermined amount. The valve body has a seal portion that slides against the seal surface of the valve seat, an apex portion opposite the seal portion, and a side portion between the apex portion and the seal portion, and the deformation restricting portion is provided so as to extend from both widthwise sides of the valve body toward the inner circumferential surface of the valve body. With this configuration, the deformation restricting portion provided so as to extend from both widthwise sides of the valve body toward the inner circumferential surface of the valve body can restrict the deformation of the biasing member from exceeding the predetermined deformation amount.

[0010] Further, a slide type switching valve of the present invention is a slide type switching valve including: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve element provided inside the valve body so as to be axially slidable on the valve seat portion and switching the communication state of the valve port; and a biasing member biasing the valve element toward the valve seat portion, wherein a deformation regulating portion is provided between the valve element and the valve body, the deformation regulating portion extending from at least one of a part of the valve element and an inner circumferential surface of the valve body to the other and restricting deformation of the biasing member from exceeding a predetermined deformation amount, the predetermined deformation amount of the biasing member is determined by a clearance between the deformation regulating portion and either the inner circumferential surface of the valve body or the outer circumferential surface of the valve element, the valve element has a seal portion in sliding contact with a seal surface of the valve seat portion and an apex portion opposite to the seal portion, and the deformation regulating portion is provided extending from the inner circumferential surface of the valve body toward the apex of the valve element. According to this configuration, the deformation restricting portion extending from the inner circumferential surface of the valve body toward the top of the valve disc can restrict deformation of the biasing member from exceeding a predetermined deformation amount.

[0011] The present invention also provides a slide type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve element provided inside the valve body so as to be slidable in the axial direction on the valve seat portion and switching the communication state of the valve port; and a biasing member biasing the valve element toward the valve seat portion, wherein a deformation restricting portion is provided between the valve element and the valve body, the deformation restricting portion extending from at least one of a part of the valve element and an inner circumferential surface of the valve body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount, The predetermined deformation amount of the biasing member is determined by a clearance between the inner peripheral surface of the valve body and either the outer peripheral surface of the valve body, the valve body has a seal portion that slides against the seal surface of the valve seat portion, an apex opposite to the seal portion, and a side portion between the apex and the seal portion, a step portion that protrudes outward in the width direction is provided on both sides of the width direction of the valve body, the deformation restricting portion is provided extending from the inner peripheral surface of the valve body toward the apex side of the valve body beyond the step portion, and the predetermined deformation amount of the biasing member is determined by a clearance between the deformation restricting portion and the step portion. According to this configuration, a step portion that protrudes outward in the width direction is provided on both sides of the width direction of the valve body, and the deformation restricting portion is provided extending from the inner peripheral surface of the valve body toward the apex side of the valve body beyond the step portion. And the predetermined deformation amount of the biasing member is determined by a clearance between the deformation restricting portion and the step portion. Therefore, the deformation restricting portion, which extends from the inner circumferential surface of the valve body toward the top side of the valve disc beyond the step portion, can restrict deformation of the biasing member from exceeding a predetermined deformation amount. Effect of the Invention

[0012] According to the present invention, even if the valve body is about to be significantly displaced due to a load exceeding that expected, the deformation of the biasing member can be suppressed to a predetermined amount or less by the deformation control portion, thereby providing a slide-type switching valve that can prevent excessive load from acting on the biasing member. [Brief description of the drawings]

[0013] [Figure 1]FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 4A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 4B is a cross-sectional view taken along line BB in FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 13A is a diagram showing the height of a biasing member, and FIG. 13B is a diagram showing the dimensions of a clearance. [Figure 8] 13A and 13B are diagrams showing modified examples of the urging member. [Figure 9] FIG. 6 is an enlarged cross-sectional view of a valve body and a valve element in a first modified example. [Figure 10] FIG. 4 is a cross-sectional view of a slide type switching valve according to a first modified example. [Figure 11] FIG. 11 is an enlarged cross-sectional view of a valve body and a valve element in a second modified example. [Figure 12] FIG. 11 is a cross-sectional view of a slide type switching valve in a second modified example. [Figure 13] FIG. 11 is an enlarged cross-sectional view of a valve body and a valve element in a third modified example. [Figure 14] FIG. 11 is a cross-sectional view of a slide type switching valve in a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 7. The slide type switching valve 1 according to this embodiment is a switching valve that is connected to a compressor, an evaporator, and a condenser in a refrigeration cycle or the like, and switches the flow path of a refrigerant flowing through these devices. The slide type switching valve 1 includes a hollow cylindrical valve body 2, a valve seat portion 3 having a plurality of valve ports provided in the valve body 2, a valve element 4 provided inside the valve body 2 so as to be slidable in the axial line L direction on the valve seat portion 3, a drive portion 5 that slides the valve element 4, a biasing member 6 that biases the valve element 4 toward the valve seat portion 3, and a deformation restricting portion 7 that restricts the biasing member 6 from deforming beyond a predetermined deformation amount. The slide type switching valve 1 of this embodiment has the drive portion 5 on one side in the axial line L direction and an inlet port P (described later) on the other side in the axial line L direction, so that one side in the axial line L direction may be referred to as the drive portion 5 side, and the other side in the axial line L direction may be referred to as the inlet port P side.

[0015] The valve body 2 is formed into a cylindrical shape with a bottom by resin molding, and includes a circular bottom wall 2A and a side wall 2B extending from the periphery of the bottom wall 2A toward the drive unit 5. The inside of the valve body 2 forms the valve chamber 2a. The bottom wall 2A is formed with an inlet port P communicating with the inside and outside of the valve chamber 2a. The inlet port P is a port communicating with a discharge port of a compressor (not shown) via an inlet connection flow path 20 extending in the axial direction L. The inlet port P forms an inlet for high-pressure refrigerant sent from the compressor to flow into the valve chamber 2a. The side wall of the valve body 2 is formed with a first connection flow path 21, an outlet connection flow path 22, and a second connection flow path 23 in this order from the drive unit 5 side along the axial direction L as a plurality of cylindrical flow paths communicating with the inside and outside of the valve chamber 2a. The first connection flow path 21 is a flow path communicating with a first port 30 described later. The first connecting flow passage 21 is connected to the condenser (or evaporator) and constitutes a flow passage for the fluid to flow between the condenser (or evaporator) and the valve chamber 2a.

[0016] The outlet connection flow path 22 is a flow path that communicates with an outlet port 31, which will be described later. This outlet connection flow path 22 is adapted to be connected to the suction port of the compressor, and constitutes a flow path through which low-pressure refrigerant that has returned to the valve chest 2a through the first connection flow path 21 (or the second connection flow path 23) is sent to the compressor. The second connection flow path 23 is a flow path that communicates with a second port 32, which will be described later. This second connection flow path 23 is connected to the evaporator (or the condenser), and constitutes a flow path for a fluid that flows between the evaporator (or the condenser) and the valve chest 2a.

[0017] As shown in Fig. 4(A) and Fig. 4(B), guide portions 24 are formed at both ends in the width direction X at the periphery of the first connecting flow passage 21, the outlet connecting flow passage 22, and the second connecting flow passage 23 inside the valve body 2. The width direction X in this embodiment is a direction perpendicular to the axis L direction, and is also perpendicular to the height direction Z perpendicular to the axis L direction from the valve seat portion 3 toward a top portion 44 of the valve body 4 described later in the cross-sectional view shown in Fig. 4(A) and Fig. 4(B). This width direction X also indicates the width direction X of the valve body 4. The guide portions 24 are formed in a stepped shape so as to rise in the height direction Z from both ends in the width direction X of a seal surface 33 of the valve seat portion 3 described later and extend in the axis L direction, and guide the valve body 4 in the axis L direction. As shown in FIG. 1, a metallic cylindrical lower cover 25 is fixed to the end of the valve body 2 facing the drive unit 5 by insert molding with the valve body 2, and a metallic bottomed cylindrical upper cover 26 having a bottom wall on the drive unit 5 side is fixed to the end of the lower cover 25 facing the drive unit 5.

[0018] The top cover 26 has a small diameter portion 26a extending toward the drive unit 5 in the direction of the axis L at the center of the bottom wall. A through hole 26b penetrating in the direction of the axis L is formed in the center of the small diameter portion 26a, and a guide member 53 described later is arranged in the through hole 26b. The valve body 2, the bottom cover 25, and the top cover 26 thus configured are accommodated in a housing 8 (shown only in Fig. 4(A) and Fig. 4(B)). Note that the reference symbol G shown in Fig. 1 denotes grooves formed at a plurality of positions in the direction of the axis L at predetermined intervals on either the outer peripheral wall of the valve body 2 or the inner peripheral wall of the housing 8, and the reference symbol 27 denotes an O-ring arranged in the groove G. The O-ring 27 seals the gap between the valve body 2 and the housing 8. Note that in this embodiment, the valve body 2 is made of a resin such as polyphenylene sulfide (PPS), but may be made of other appropriate materials such as metals such as brass, iron, aluminum, and stainless steel.

[0019] The valve seat portion 3 is a portion of the side wall of the valve body 2 on which the first connection flow passage 21, the outlet connection flow passage 22, and the second connection flow passage 23 are formed, and is configured to have a plurality of valve ports. The valve seat portion 3 is formed of a thin metal plate and fixed to the side wall of the valve body 2 by insert molding, bonding, welding, or the like. A first port 30 communicating with the first connection flow passage 21, an outlet port 31 communicating with the outlet connection flow passage 22, and a second port 32 communicating with the second connection flow passage 23 are formed penetrating the plate surface of the valve seat portion 3. Each of the ports 30, 31, and 32 is formed in a cylindrical shape with an inner diameter smaller than that of the first connection flow passage 21, the outlet connection flow passage 22, and the second connection flow passage 23, and is arranged at a predetermined interval in the axial direction L. The plate surface of the valve seat portion 3, the surface opposite to the surface on which the connection flow passages 21, 22, and 23 are formed, constitutes a seal surface 33 that comes into sliding contact with a seal portion S of the valve body 4 described later. Therefore, the multiple valve ports 30 , 31 , 32 open to the sealing surface 33 .

[0020] The valve body 4 is mainly made of a resin such as polyphenylene sulfide (PPS) and is provided inside the valve body 2 so as to be slidable in the axial direction L on the valve seat 3. The valve body 4 is configured to switch the communication state of the valve ports P, 30, 31, and 32, and in this embodiment, is configured with a bowl-shaped valve body main body 40 that seats on the valve seat 3 to communicate or block each of the inlet port P, the first port 30, the outlet port 31, and the second port 32. The valve body main body 40 is configured with an elliptical opening edge 40a that is long in the axial direction L and is provided to face the seal surface 33 of the valve seat 3, and a bowl-shaped side portion 40b that protrudes from the opening edge 40a to the side opposite to the side where the valve seat 3 is located, and the inside forms a bowl-shaped recess 40c that serves as a fluid flow path. That is, the valve body 4 is formed in a bowl shape that opens toward the valve seat 3. The dimension of the opening edge 40a of the bowl-shaped recess 40c in the axial direction L is set to a length sufficient to cover two adjacent ports among the first port 30, the outlet port 31, and the second port 32. In addition, the dimension of the opening edge 40a in the width direction X is set to a length sufficient to cover one port among the first port 30, the outlet port 31, and the second port 32.

[0021] The bowl-shaped recess 40c constitutes a seal portion S whose opening edge 40a slides against the above-mentioned seal surface 33. That is, the valve body 4 has a seal portion S which slides against the seal surface 33 of the valve seat portion 3. When the seal portion S abuts against the seal surface 33, for example, the first port 30 and the outlet port 31 are surrounded by the bowl-shaped recess 40c and are blocked from the other ports P and 32. As a result, the first port 30 and the outlet port 31 are communicated, and the inlet port P and the second port 32 are communicated. Then, when the seal portion S slides toward the inlet port P while sliding on the seal surface 33, the outlet port 31 and the second port 32 are surrounded by the bowl-shaped recess 40c and are blocked from the other ports P and 30. As a result, the outlet port 31 and the second port 32 are communicated, and the inlet port P and the first port 30 are communicated. That is, the valve body 40 slides and the seal portion S comes into sliding contact with the seal surface 33, whereby the ports P, 30, 31, 32 can be switched between communication and cut-off.

[0022] A stopper 41 is formed on the end of the valve body 40 on the inlet port P side, protruding in the axial direction L toward the inlet port P side. The stopper 41 is a protrusion for restricting the sliding movement of the valve body 4, and the protruding end abuts against the surface 2A1 on the valve chamber 2a side of the bottom wall 2A of the valve body 2 to restrict the movement of the valve body 4 toward the inlet port P side. In other words, the stopper 41 and the surface 2A1 on the valve chamber 2a side of the bottom wall 2A of the valve body 2 define the limit position of the movement of the valve body 4 toward the inlet port P side. A connecting portion 42 is formed on the end of the valve body 40 on the drive unit 5 side, protruding toward the drive unit 5 side. The connecting portion 42 forms a thin plate-shaped thin plate portion 42a whose end on the drive unit 5 side extends in the height direction Z from the side where the valve seat 3 is located to the opposite side where the valve seat 3 is located. A notch 42b is formed in the thin plate portion 42a, the notch 42b being open on the side opposite to the side where the valve seat portion 3 is located, and this makes the thin plate portion 42a hook-shaped.

[0023] Both end faces in the width direction X of the thin plate portion 42a are sandwiched in the width direction X by two connecting arms 55b of the female screw member 55 described later, and are connected to the female screw member 55 by a fixing pin 57 disposed in the notch 42b in this state, and a metal hose band 43 that circumferentially surrounds the connecting arms 55b and the thin plate portion 42a and tightens them in the same direction. The end of the valve body main body 40 in the height direction Z (the end opposite to the side where the seal portion S is located) constitutes the apex 44 of the valve body 4. With this configuration, the valve body 4 has the seal portion S, the apex 44 opposite to the seal portion S, and a side portion 40b between the apex 44 and the seal portion S. As shown in FIG. 5, the apex 44 is formed in a stepped shape that bulges in the height direction Z toward the side opposite to the side where the valve seat portion 3 is located and extends in the direction of the axis L, and a tip surface 44a of the apex 44 that faces the inner circumferential surface of the valve body 2 is formed flat so that a biasing member 6 described later can be installed. A mounting protrusion 44b is formed in the center of the tip surface 44a in the axial direction L so as to rise up and be fitted into a mounting hole 60a of a mounting portion 60 of the biasing member 6, which will be described later. As shown in Figs. 4(A) and 4(B), both sides 40b1 in the width direction X of the side portion 40b of the valve body 4 are provided with guided portions 45 that can slide in the axial direction L and the height direction Z relative to the above-mentioned guide portion 24. The guided portions 45 are provided so as to protrude outward in the width direction X. The guided portions 45 are provided so as to form step portions 45a on the top portion 44 side of the valve body 4. That is, both sides 40b1 in the width direction X of the valve body 4 are provided with step portions 45a that protrude outward in the width direction X.

[0024] The driving unit 5 is a part that drives the valve body 4 to slide, and includes a stepping motor 5a as an electric motor having a rotatable rotor, and a linear motion mechanism 5b that converts the rotation of the stepping motor 5a into linear motion and transmits it to the valve body 4. As shown in Fig. 1, the stepping motor 5a includes a metal, bottomed, cylindrical can 50 that is fixed to the small diameter portion 26a of the top cover 26 and seals the inside of the driving unit 5, a magnet rotor 51 built in the can 50, and a stator coil (not shown) that is arranged to surround the outer periphery of the magnet rotor 51 around the axis L with the can 50 in between. The can 50 is formed into a bottomed cylindrical shape from a thin metal material, is arranged so that its central axis is coaxial with the axis L of the valve body 2, and its tip is fixed to the edge of the small diameter portion 26a of the above-mentioned top cover 26 by welding or the like. The linear motion mechanism 5b includes a bearing member 52 disposed inside the bottom side (opposite the inlet port P side) of the can 50, a guide member 53 fixed to the upper cover 26, a male screw 54 as a rotor shaft fixed to the center of the magnet rotor 51 via a fixing member 54a, and a female screw member 55 having a female screw portion 55a1 that screws into a male screw portion 54d formed on the outer circumferential surface of the male screw 54. That is, the linear motion mechanism 5b is configured as a screw feed mechanism having a male screw portion 54d and a female screw portion 55a1 that screw into each other.

[0025] The bearing member 52 is a member that supports the male screw 54 rotatably around the axis L, and is formed in a cylindrical shape. The bearing member 52 is inserted into the can 50 so that its central axis is coaxial with the axis L of the valve body 2, and is positioned so that its end opposite the inlet port P in the direction of the axis L abuts against the inner surface of the bottom wall of the can 50. A first bearing hole 52a that opens toward the inlet port P side is formed in the center of the bearing member 52, which is the axial center position of the male screw 54. The first bearing hole 52a is a bottomed recessed hole into which a first shaft portion 54b, which will be described later, can be inserted.

[0026] The guide member 53 is a cylindrical member with a bottom, and is disposed in the through hole 26b of the upper lid 26 so that the bottom is located on the inlet port P side and the tip is located on the opposite side to the inlet port P. The guide member 53 has a fixing ring 56 integrally provided by insert molding at approximately the center in the axis L direction, and is fixed to the upper lid 26 by welding the fixing ring 56 to the edge of the small diameter portion 26a of the upper lid 26. The guide member 53 is disposed so that its central axis is coaxial with the axis L of the valve body 2, and this disposition results in the above-mentioned can 50, bearing member 52, and guide member 53 being disposed so that their central axes are all coaxial with the axis L of the valve body 2. A second bearing hole 53a is formed in the center of the guide member 53, which is the axial center position of the male screw 54, and opens to face the first bearing hole 52a in the axis L direction. The second bearing hole 53a is a bottomed recessed hole provided so that a second shaft portion 54c described later can be inserted.

[0027] 2, a pair of guide holes 53b are formed in the bottom wall of the guide member 53 at a portion radially outward of the second bearing hole 53a, through which a connecting arm portion 55b of the female screw member 55 described later is inserted so as to be capable of advancing and retreating in the direction of the axis L. The edge of the guide hole 53b is formed in a shape that conforms to the outer circumferential surface of the connecting arm portion 55b, so that even if the connecting arm portion 55b attempts to rotate about the axis L when advancing and retreating in the direction of the axis L, it cannot rotate because the outer wall surface abuts against the edge of the guide hole 53b. In other words, the guide member 53 is configured to guide the female screw member 55 so as to be unable to rotate about the axis L and to advance and retreat in the direction of the axis L.

[0028] The male screw 54 is fixed to the center of the magnet rotor 51 by using a fixing member 54a, extends in the direction of the axis L, and is configured to rotate around the axis L together with the magnet rotor 51. One end of the male screw 54 forms a cylindrical first shaft portion 54b, and the other end of the male screw 54 forms a cylindrical second shaft portion 54c, and a male screw portion 54d is formed on the outer circumferential surface of the portion between the first shaft portion 54b and the second shaft portion 54c. The first shaft portion 54b is fitted into the first bearing hole 52a, and the second shaft portion 54c is fitted into the second bearing hole 53a, so that the male screw 54 is supported in the first bearing hole 52a and the second bearing hole 53a so that the central axis is coaxial with the axis L so as to be rotatable around the axis L.

[0029] The female screw member 55 is configured to include a cylindrical base end portion 55a that is accommodated in the guide member 53 and whose outer circumferential wall is in sliding contact with the inner circumferential wall of the guide member 53, and two connecting arms 55b that extend from the base end portion 55a in the axial direction L toward the inlet port P side and extend through the above-mentioned guide hole 53b into the valve chamber 2a. The base end portion 55a is formed so that its central axis is coaxial with the central axis of the guide member 53. A female screw portion 55a1 is formed in the center of the female screw member 55 along the axial line L. The female screw portion 55a1 is configured to screw into the male screw portion 54d. With this configuration, the female screw member 55 can advance and retreat in the axial direction L coaxially with the central axis as the male screw 54 rotates. The connecting arms 55b are a portion for connecting the drive unit 5 and the valve body 4. The connecting arms 55b extend in the direction of the axis L from part of the periphery of the base end 55a through the guide holes 53b to the valve chamber 2a. As shown in Fig. 2, a through hole 55b1 is formed in the tip of each connecting arm 55b, penetrating the connecting arm 55b in the plate thickness direction, and a shaft-shaped fixing pin 57 is inserted and fixed in the through hole 55b1.

[0030] The biasing member 6 is a member for biasing the valve body 4 toward the valve seat portion 3, and in this embodiment, is configured as a leaf spring formed by pressing or the like using a metal material such as phosphorus bronze. As shown in FIG. 6, the biasing member 6 includes an attachment portion 60 attached to the tip surface 44a at the top 44 of the valve body main body 40, an extension portion 61 rising from the attachment portion 60 in the height direction Z, and a contact portion 62 provided at the tip of the extension portion 61 and capable of contacting the inner peripheral surface of the valve body 2, and is disposed between the tip surface 44a at the top 44 of the valve body main body 40 and the inner peripheral surface of the valve body 2 as shown in FIG. 3. The attachment portion 60, the extension portion 61, and the contact portion 62 are integrally formed. The attachment portion 60 is formed in a flat plate shape that is aligned with the tip surface 44a of the top 44 and has a smaller dimension in the axis L direction than the tip surface 44a. A mounting hole 60a for fitting the above-mentioned mounting protrusion 44b is formed penetrating in the plate thickness direction at the center of the mounting portion 60 in the direction of the axis L. This mounting portion 60 is fixed to the valve body 40 by abutting the end face on the valve seat 3 side against the tip face 44a and fitting the mounting protrusion 44b into the mounting hole 60a.

[0031] The extension portion 61 includes a base end portion 61a connected to one end of the mounting portion 60 in the width direction X, and a folded portion 61b folded back from the base end portion 61a and extending to the other end side in the width direction X, i.e., the opposite side. The extension portion 61 is configured so that the base end portion 61a and the folded portion 61b are deformed to approach each other when the urging member 6 receives a force such as a pressing force in the height direction Z, and the urging force is generated by the force of the urging member 6 trying to restore its shape after deformation. The contact portion 62 is a protrusion provided at the tip of the folded portion 61b in the extension portion 61, and is formed to protrude in a hemispherical shape toward the inner circumferential surface of the valve body 2. With this configuration, the protruding end portion of the contact portion 62 formed in a hemispherical shape abuts against the inner circumferential surface of the valve body 2, and the mounting portion 60 formed in a flat plate shape is fixed to the tip surface 44a of the top 44, so that the urging member 6 is provided between the inner circumferential surface of the valve body 2 and the top 44 of the valve body 4. The biasing member 6 biases the valve body 4 toward the valve seat portion 3, thereby preventing the valve body 4 from floating up in the height direction Z.

[0032] The deformation restricting portion 7 is a portion that restricts the deformation of the biasing member 6, which deforms as described above, from exceeding a predetermined deformation amount that the biasing member 6 can deform as described above, and is made of a resin material such as polyphenylene sulfide (PPS) and is molded integrally with the valve body 4. As shown in FIG. 5, the deformation restricting portion 7 extends from both ends of the top portion 44 of the valve body 4 in the axial direction L toward the inner peripheral surface of the valve body 2 (i.e., in the height direction Z), and also extends in the width direction X, and is formed in a plate shape that overlaps with the mounting portion 60 and the extension portion 61 of the biasing member 6 in the axial direction L. That is, the deformation restricting portion 7 is provided between the valve body 4 and the valve body 2. In this configuration, when the valve body 4 displaces in the height direction Z toward the opposite side to the valve seat portion 3, when the tip of the deformation restricting portion 7 abuts against the inner peripheral surface of the valve body 2, the valve body 4 cannot be displaced further in the height direction Z, and the biasing member 6 cannot be deformed. As shown in FIG. 4B, a clearance A is provided between the tip of the deformation restricting portion 7 and the inner peripheral surface of the valve body 2. As described above, when the deformation restricting portion 7 abuts against the inner peripheral surface of the valve body 2, the biasing member 6 cannot deform any further, and this clearance A functions as a gap that determines the predetermined deformation amount of the biasing member 6. In other words, the predetermined deformation amount of the biasing member 6 is determined by the clearance A between the tip of the deformation restricting portion 7 and the inner peripheral surface of the valve body 2. As shown in FIG. 4A and FIG. 4B, the dimension of the clearance A is set smaller than the height dimension H1, which is the dimension in the height direction Z of the above-mentioned guide portion 24. This prevents the valve body 4 from displacing in the height direction Z of the guide portion 24 beyond the height dimension H1 of the guide portion 24, even if the valve body 4 is displaced in a direction away from the valve seat portion 3, and prevents the valve body 4 from riding up the guide portion 24.

[0033] 7, the dimension of the clearance A is set to a clearance dimension H4 that is about 50% or less of the combined height dimension (first dimension H2+second dimension H3) of the extension portion 61 and the contact portion 62 of the urging member 6, where the dimension in the height direction Z of the extension portion 61 is the first dimension H2 and the dimension in the height direction Z of the contact portion 62 is the second dimension H3. That is, the dimension of the clearance A between the tip of the deformation restricting portion 7 and the inner circumferential surface of the valve body 2 is set to about half or less of the combined height dimension of the extension portion 61 and the contact portion 62 of the urging member 6. Note that, since the clearance A is provided, the fluid flowing in the valve chamber 2a may flow through the clearance A. In this embodiment, since the inlet port P is open in the axial direction L, the high-pressure fluid flowing into the valve chamber 2a often flows in the axial direction L from the inlet port P side toward the drive portion 5 side (the inlet port P side is upstream of the valve body 4).

[0034] However, as described above, the dimension of the attachment portion 60 of the biasing member 6 in the axial direction L is smaller than the dimension of the tip surface 44a of the top portion 44 of the valve body 4 in the axial direction L, so that as shown in FIG. 1, each deformation regulating portion 7 is disposed so as to sandwich the biasing member 6 from the drive portion 5 side and the inlet port P side in the axial direction L. As a result, for example, when the axial direction L is the fluid flow direction, each deformation regulating portion 7 extends in a direction intersecting the fluid flow direction (height direction Z and width direction X), and at least one of the deformation regulating portions 7 is provided upstream of the biasing member 6 in the fluid flow direction inside the valve body 2. In detail, of the deformation regulating portions 7, the deformation regulating portion 7 located on the inlet port P side is located on the inlet port P side of the biasing member 6, and since the inlet port P side is upstream of the valve body 4 as described above, the deformation regulating portion 7 on the inlet port P side is provided upstream of the biasing member 6 in the fluid flow direction inside the valve body 2.

[0035] As described above, the deformation restricting portion 7 is provided so as to overlap the mounting portion 60 and the extending portion 61 of the biasing member 6 in the axial line L direction, and therefore each deformation restricting portion 7 is provided so as to overlap the mounting portion 60 and the extending portion 61 of the biasing member 6 in the fluid flow direction. In addition, as shown in Figs. 4(A) and 4(B), a chamfered portion 7a is formed on the tip edge of each deformation restricting portion 7. The chamfered portion 7a is provided by chamfering so as to follow the outer shape of the biasing member 6 as viewed from the above-mentioned fluid flow direction. In this embodiment, the chamfered portion 7a is formed by chamfering one end side of the deformation restricting portion 7 in the width direction X along the folded portion 61b of the extending portion 61 of the biasing member 6 as viewed from the fluid flow direction.

[0036] In this embodiment, the deformation restricting portion 7 is configured so as not to unnecessarily impede the fluid flowing through the valve chamber 2a, as shown in Fig. 5. Specifically, when the valve body 4 is viewed from the top 44 side, the deformation restricting portion 7 is disposed so as not to extend beyond the outer shape of the top 44 in the axis L direction and width direction X, and is contained between the top 44 and the inner peripheral surface of the valve body 2, as shown in Fig. 5.

[0037] In the slide type switching valve 1 configured as described above, the valve element 4 slides in the direction of the axis L to switch the flow path of the refrigerant. First, when the drive unit 5 is driven to move the valve element 4 toward the inlet port P, the valve element 4 slides toward the inlet port P while being guided by the guide unit 24 while properly maintaining the position relative to the valve ports 30, 31, 32, and the second port 32 and the outlet port 31 are covered by the valve element main body 40. This allows the second port 32 to communicate with the outlet port 31. Also, the inlet port P and the first port 30 are communicated with each other. At this time, high-pressure refrigerant flows into the valve chamber 2a through the inlet connection flow path 20 and the inlet port P, and the high-pressure refrigerant is sent to the condenser through the first port 30 and the first connection flow path 21. Meanwhile, low-pressure refrigerant sent from the evaporator flows into the bowl-shaped recess 40c via the second port 32 and the second connecting passage 23, and the low-pressure refrigerant is sent to the intake port of the compressor via the outlet port 31 and the outlet connecting passage 22.

[0038] Next, when the valve body 4 is moved toward the drive unit 5, the valve body 4 slides toward the drive unit 5 while being guided by the guide portion 24 while properly maintaining the position of the valve ports 30, 31, and 32, and the valve body main body 40 covers the outlet port 31 and the first port 30. As a result, the outlet port 31 and the first port 30 are communicated. Also, the inlet port P and the second port 32 are communicated. At this time, high-pressure refrigerant flows into the valve chamber 2a through the inlet connection passage 20 and the inlet port P, and the high-pressure refrigerant is sent to the evaporator through the second port 32 and the second connection passage 23. Meanwhile, low-pressure refrigerant sent from the condenser flows into the bowl-shaped recess 40c through the first port 30 and the first connection passage 21, and the low-pressure refrigerant is sent to the suction port of the compressor through the outlet port 31 and the outlet connection passage 22. Regardless of whether any of the ports P, 30, 31, 32 are in communication or blocked, the fluid in the valve chamber 2a may flow into the valve chamber 2a through between the inner circumferential surface of the valve body 2 and the top 44 of the valve element 4, because a clearance A is provided between the deformation restricting portion 7 and the inner circumferential surface of the valve body 2. However, because the biasing member 6 and the deformation restricting portion 7 are provided in the above-mentioned positional relationship, the flow velocity of the fluid is first reduced by the deformation restricting portion 7 provided on the upstream side, and the momentum of the fluid against the mounting portion 60 and extension portion 61 on the downstream side is suppressed.

[0039] When the valve body 40 is in communication with or blocking each of the ports P, 30, 31, 32, the sealing portion S of the valve body 4 is pressed against the sealing surface 33 of the valve seat 3 by the biasing force of the biasing member 6, making it difficult for a gap to form between the sealing portion S and the sealing surface 33, thereby ensuring airtightness within the valve body 4. In this state, if the valve body 4 is significantly displaced in a direction away from the valve seat 3 due to a load that exceeds expectations, such as an impact pressure blowing up from inside the valve body 4, the biasing member 6 will deform in the same direction, but the tip of the deformation restriction portion 7 will abut against the inner circumferential surface of the valve body 2, eliminating the above-mentioned clearance A, and the valve body 4 will not be displaced any further, so that deformation of the biasing member 6 beyond a predetermined deformation amount is suppressed.

[0040] According to the above embodiment, the slide type switching valve 1 is a slide type switching valve 1 including a hollow cylindrical valve body 2, a valve seat portion 3 having a plurality of valve ports 30, 31, 32 provided in the valve body 2, a valve element 4 provided inside the valve body 2 so as to be slidable in the axial L direction on the valve seat portion 3 and switching the communication state of the valve ports 30, 31, 32, and a biasing member 6 that biases the valve element 4 toward the valve seat portion 3, and a deformation control portion 7 is provided between the valve element 4 and the valve body 2, which extends from a part of the valve element 4 to the inner surface of the valve body 2 and controls the deformation of the biasing member 6 beyond a predetermined deformation amount.

[0041] According to the present invention, the valve body 4 provided inside the valve body 2 is biased toward the valve seat 3 by the biasing member 6. Therefore, the biasing force of the biasing member 6 presses the valve body 4 against the seal surface 33 of the valve seat 3, making it difficult for a gap to occur between the seal surface 33 and the valve body 4, and airtightness inside the valve body 4 can be ensured. In addition, a deformation restriction portion 7 is provided between the valve body 4 and the valve body 2, which extends from a part of the valve body 4 to the inner circumferential surface of the valve body 2 and restricts the deformation of the biasing member 6 from exceeding a predetermined deformation amount. Therefore, even if a load exceeding an expected value, such as an impact pressure blowing up from inside the valve body 4, acts on the valve body 4, the deformation of the biasing member 6 can be restricted to a predetermined deformation amount, thereby restricting the valve body 4 from being significantly displaced in a direction away from the valve seat 3. Therefore, even if the valve body 4 is about to be significantly displaced by a load exceeding an expected value, the deformation restriction portion 7 can restrict the deformation of the biasing member 6 to a predetermined amount or less, and a slide type switching valve 1 can be obtained in which an excessive load is prevented from acting on the biasing member 6.

[0042] According to this embodiment, the predetermined deformation amount of the urging member 6 is determined by the clearance A between the deformation restricting portion 7 and the inner peripheral surface of the valve body 2. According to this configuration, before the urging member 6 is deformed to the predetermined deformation amount, that is, in the normal state, the displacement of the valve body 4 is not restricted by the deformation restricting portion 7, so that the valve body 4 can be smoothly slid in the axial direction L without impairing the slidability with respect to the valve seat portion 3. Furthermore, the valve body 4 has a seal portion S that is in sliding contact with the seal surface 33 of the valve seat portion 3 and a top portion 44 on the opposite side to the seal portion S, and the deformation restricting portion 7 is provided so as to extend from the top portion 44 of the valve body 4 toward the inner peripheral surface of the valve body 2. According to this configuration, the deformation restricting portion 7 provided so as to extend from the top portion 44 of the valve body 4 toward the inner peripheral surface of the valve body 2 can restrict the deformation of the urging member 6 from exceeding the predetermined deformation amount.

[0043] Moreover, the deformation restricting portion 7 is provided upstream of the biasing member 6 in the fluid flow direction inside the valve body 2, and is provided so as to overlap with the attachment portion 60 and the extension portion 61 of the biasing member 6 in the fluid flow direction. For this reason, the flow velocity of the high-pressure fluid flowing inside the valve body 2 in particular is first reduced by the deformation restricting portion 7 provided on the upstream side, and the momentum of the fluid against the attachment portion 60 and the extension portion 61 of the biasing member 6 on the downstream side can be suppressed, thereby protecting the biasing member 6.

[0044] In addition, the clearance A between the tip of the deformation restricting portion 7 and the inner peripheral surface of the valve body 2 is set to be equal to or less than half the height dimension (first dimension H2+second dimension H3) of the extension portion 61 and the contact portion 62 of the urging member 6 combined, so that the deformation of the urging member 6 can be appropriately suppressed. In addition, the deformation restricting portion 7 is formed in a plate shape that extends from the top portion 44 of the valve body 4 toward the inner peripheral surface of the valve body 2 and extends in a direction intersecting the fluid flow direction (the axis L direction in this embodiment), and the tip edge of the deformation restricting portion 7 is provided with a chamfered portion 7a that follows the outer shape of the urging member 6 as seen from the fluid flow direction. In this way, the tip edge of the deformation restricting portion 7 formed in a plate shape is provided with a chamfered portion 7a that follows the outer shape of the urging member 6 as seen from the fluid flow direction, so that the urging member 6 can be protected while suppressing the deformation restricting portion 7 from becoming larger than necessary.

[0045] In addition, since the biasing member 6 can be formed of a leaf spring in which the mounting portion 60, the extension portion 61, and the contact portion 62 are integrated, the biasing member 6 can be made smaller in size than a biasing member 6 in which the mounting portion 60, the extension portion 61, and the contact portion 62 are not integrated. Inside the valve body 2, a guide portion 24 is provided, which rises from the seal surface 33 of the valve seat portion 3, extends in the axial direction L, and guides the valve body 4 in the axial direction L. Since the above-mentioned clearance A is set smaller than the height dimension H1 of the guide portion 24, even if an unexpected load such as an impact pressure blowing up from inside the valve body 4 acts on the valve body 4 and the valve body 4 is significantly displaced in the direction away from the valve seat portion 3, the valve body 4 can be prevented from displacing in the same direction beyond the height dimension H1 of the guide portion 24. Therefore, the valve body 4 is prevented from riding onto the guide portion 24, thereby allowing the guide portion 24, which maintains the proper positioning of the valve body 4 and the valve ports 30, 31, 32, to function normally and ensuring the sliding movement of the valve body 4.

[0046] The present invention is not limited to the above embodiment, and includes other configurations that can achieve the object of the present invention, and the following modified examples are also included in the present invention. FIG. 8 is a diagram showing a modified example of the urging member 6. Reference numeral 6a in FIG. 8 denotes the urging member in this modified example, and the urging member 6a is configured to include an attachment portion 60a1, an extension portion 61A having a base end portion 61a1 and a folded portion 61b1, and a contact portion 62a. The shape of the extension portion 61A is different from the shape of the extension portion 61 in the above embodiment. Specifically, the extension portion 61 in the above embodiment is formed in a shape folded back at an acute angle in a plan view, whereas the extension portion 61A in this modified example is formed in a shape folded back so as to be curved in a plan view.

[0047] Next, a first modified example of the present invention will be described. FIG. 9 is an enlarged cross-sectional view of the valve body 2 and the valve element 4 in the first modified example, and FIG. 10 is a cross-sectional view of the slide type switching valve 1 in the first modified example. Reference numeral 71 in FIG. 9 and FIG. 10 indicates a deformation restricting portion in the first modified example. In this first modified example, the shape and arrangement of the deformation restricting portion 71 are different from those of the deformation restricting portion 7 in the above embodiment, and the deformation restricting portion 71 is provided extending in the height direction Z from both width direction X side portions 40b1 of the valve element 4 toward the inner peripheral surface of the valve body 2. As shown in FIG. 10, the deformation restricting portion 71 is formed in a rod shape so that the tip portion on the side opposite to the valve seat portion 3 has a rounded tip, and is provided on both width direction X side portions 40b1 on the drive portion 5 side and both width direction X side portions 40b1 on the inlet port P side (i.e., four in total). A clearance A1 is provided between the tip of the deformation restricting portion 71 and the inner peripheral surface of the valve body 2. This clearance A1 has the same function as the clearance A in the above embodiment, and its dimension is set smaller than the height dimension H1 of the above-mentioned guide portion 24, and the predetermined deformation amount of the urging member 6 is determined by the clearance A1 between the tip of the deformation restricting portion 71 and the inner circumferential surface of the valve body 2. According to such a first modified example, the same effects as those of the above embodiment are achieved, and the predetermined deformation amount of the urging member 6 can be restricted by the deformation restricting portions 71 provided so as to extend from both side portions 40b1 in the width direction X of the valve disc 4 toward the inner circumferential surface of the valve body 2.

[0048] Next, a second modified example of the present invention will be described. FIG. 11 is an enlarged cross-sectional view of the valve body 2 and the valve element 4 in the second modified example, and FIG. 12 is a cross-sectional view of the slide type switching valve 1 in the second modified example. Reference numeral 72 in FIG. 11 and FIG. 12 indicates a deformation restricting portion in the second modified example. In this second modified example, the shape and arrangement of the deformation restricting portion 72 are different from those of the deformation restricting portions 7, 71 in the above embodiment and the first modified example, and the deformation restricting portion 72 is provided extending from the inner peripheral surface of the valve body 2 toward the top portion 44 of the valve element 4. The deformation restricting portion 72 is formed so as to bulge in the height direction Z from a position facing one end side of the top portion 44 of the valve element 4 in the width direction X and the height direction Z toward the top portion 44, and to extend in the axial direction L from the drive unit 5 side to the inlet port P side. A clearance A2 is provided between the tip of the deformation restricting portion 72 and the top portion 44 of the valve element 4 (i.e., the outer peripheral surface of the valve element 4). This clearance A2 has the same function as the clearances A and A1 in the above embodiment and the first modified example, and its dimension is set smaller than the height dimension H1 of the above-mentioned guide portion 24, and the predetermined deformation amount of the urging member 6 is determined by the clearance A2 between the tip of the deformation restricting portion 72 and the top portion 44 of the valve body 4. According to the second modified example, the same action and effect as the above embodiment is achieved, and the deformation restricting portion 72 extending from the inner peripheral surface of the valve body 2 toward the top portion 44 of the valve body 4 can restrict the predetermined deformation amount of the urging member 6. In addition, in the second modified example, since the deformation restricting portion 72 is formed on the valve body 2 side, the structure of the valve body 4 can be simplified by the amount that the deformation restricting portion 72 is not provided on the valve body 4.

[0049] Next, a third modified example of the present invention will be described. FIG. 13 is an enlarged cross-sectional view of the valve body 2 and the valve element 4 in the third modified example, and FIG. 14 is a cross-sectional view of the slide type switching valve 1 in the third modified example. Reference numeral 73 in FIG. 13 and FIG. 14 indicates a deformation restricting portion in the third modified example. In this third modified example, the shape and arrangement of the deformation restricting portion 73 are different from those of the deformation restricting portions 7, 71, and 72 in the above-mentioned embodiment, the first modified example, and the second modified example, and the deformation restricting portion 73 is provided so as to extend from the inner peripheral surface of the valve body 2 toward the top portion 44 of the valve element 4 beyond the step portion 45a of the guided portion 45 in the width direction X both sides 40b1 of the valve element 4. That is, the deformation restricting portion 73 is provided so as to extend from the inner peripheral surface of the valve body 2 toward the top portion 44 of the valve element 4 beyond the step portion 45a. The deformation restricting portion 73 is formed in a rib shape that extends inward in the width direction X from the inner surface of both sides of the width direction X of the valve body 2 and extends in the axial direction L from the drive unit 5 side to the inlet port P side. A clearance A3 is provided between the tip of the deformation restricting portion 73 and the step portion 45a of the guided portion 45 (i.e., the outer circumferential surface of the valve body 4). The clearance A3 has a function similar to that of the clearances A, A1, A2 in the above-described embodiment, the first modified example, and the second modified example, and its dimension is set smaller than the height dimension H1 (not shown in FIG. 14) of the above-described guide portion 24, and a predetermined deformation amount of the biasing member 6 is determined by the clearance A3 between the tip of the deformation restricting portion 73 and the step portion 45a.

[0050] According to the third modified example, the same effect as that of the above embodiment is achieved, and the deformation of the urging member 6 can be restricted from exceeding a predetermined deformation amount by the deformation restricting portion 73 provided extending from the inner circumferential surface of the valve body 2 toward the top portion 44 of the valve body 4 beyond the step portion 45a. According to this modified example, when the valve body 4 is displaced in a direction away from the valve seat portion 3, the step portion 45a of the guided portion 45 of the valve body 4 abuts against the deformation restricting portion 73. At this time, as described above, since the guided portion 45 is provided so as to be able to slide in the height direction Z with respect to each guide portion 24 provided on the valve body 2, the guided portion 45 moves in the height direction Z while sliding against the guide portion 24, whereby the step portion 45a abuts against the deformation restricting portion 73. Therefore, by making the guided portion 45 slide against the guide portion 24 (i.e., by being guided by the guide portion 24), the step portion 45a can be abutted against the deformation control portion 73 without shifting position, and the deformation of the urging member 6 can be restricted to a predetermined amount or less by the deformation control portion 73.

[0051] Although the embodiment and the modified examples 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 modified examples, and the present invention includes design changes within the scope of the present invention. For example, in the above embodiment, the flow direction of the fluid flowing in the valve chamber 2a is the axis L direction, but the flow direction of the fluid is not limited to the axis L direction. For example, the inlet port P may be disposed to face the first port 30, the outlet port 31, and the second port 32 in a direction intersecting the axis L direction. In this case, since the high-pressure fluid flowing in the valve chamber 2a is likely to flow in a direction intersecting the axis L direction, it is preferable to set the direction intersecting the axis L direction as the fluid flow direction, and to provide the deformation restricting portion 7 on the upstream side of the direction intersecting the axis L direction and overlapping with the mounting portion 60 and the extension portion 61. In addition, the above embodiment, the first modified example, the second modified example, and the third modified example may be configured independently of each other, or any or all of these configurations may be combined. In other words, the deformation control portion 7 provided between the valve body 4 and the valve main body 2 extends from at least one of a part of the valve body 4 and the inner circumferential surface of the valve body 2 to the other, and the predetermined deformation amount of the biasing member 6 is determined by the clearance A between the deformation control portion 7 and either the inner circumferential surface of the valve body 2 or the outer circumferential surface of the valve body 4.

[0052] Furthermore, in this embodiment, the valve seat portion 3 is configured to have multiple (three) ports 30, 31, 32, but the valve seat portion 3 does not necessarily have to have multiple ports and may have a configuration with one port. That is, the valve seat portion 3 may have one or multiple valve ports provided in the valve body 2. Furthermore, the valve element 4 does not necessarily have to be formed in a bowl shape, and may have a configuration in which it is slidable on the valve seat portion 3 and can switch between the communicating and blocked states of each port. [Explanation of symbols]

[0053] L axis A Clearance S Seal Part 1 Slide type switching valve 2 Valve body 3 Valve seat 33 Sealing surface 4 Valve body 40a Opening edge 44 Top 5 Drive unit 6. Pressing member 7. Deformation Control Section

Claims

1. A slide-type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve body provided inside the valve body so as to be slidable in an axial direction on the valve seat portion and switching a communication state of the valve port; and a biasing member biasing the valve body toward the valve seat portion, a deformation restriction portion is provided between the valve body and the valve main body, the deformation restriction portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve main body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount; a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and either an inner circumferential surface of the valve body or an outer circumferential surface of the valve disc, The valve body has a seal portion that is in sliding contact with a seal surface of the valve seat portion, and a top portion opposite the seal portion, The deformation restricting portion is provided to extend from the top portion of the valve body toward an inner circumferential surface of the valve main body, the biasing member has an attachment portion attached to the top portion of the valve body, an extension portion rising from the attachment portion, and a contact portion provided at a tip of the extension portion and capable of contacting an inner circumferential surface of the valve body, a pressure vessel that is in contact with the pressure vessel and that is in contact with the pressure vessel and that is in contact with the pressure vessel, the pressure vessel being configured to be in contact with the pressure vessel and that is ...

2. A slide-type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve body provided inside the valve body so as to be slidable in an axial direction on the valve seat portion and switching a communication state of the valve port; and a biasing member biasing the valve body toward the valve seat portion, a deformation restriction portion is provided between the valve body and the valve main body, the deformation restriction portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve main body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount; a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and either an inner circumferential surface of the valve body or an outer circumferential surface of the valve disc, a guide portion is provided inside the valve body, the guide portion rising from a seal surface of the valve seat portion and extending in the axial direction to guide the valve element in the axial direction; The slide type switching valve, wherein the clearance is set smaller than a height dimension of the guide portion.

3. A slide-type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve body provided inside the valve body so as to be slidable in an axial direction on the valve seat portion and switching a communication state of the valve port; and a biasing member biasing the valve body toward the valve seat portion, a deformation restriction portion is provided between the valve body and the valve main body, the deformation restriction portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve main body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount; a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and either an inner circumferential surface of the valve body or an outer circumferential surface of the valve disc, The valve body has a seal portion that is in sliding contact with a seal surface of the valve seat portion, an apex portion opposite to the seal portion, and a side portion between the apex portion and the seal portion, The deformation restricting portion is provided extending from both widthwise sides of the valve body toward an inner peripheral surface of the valve body.

4. A slide-type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve body provided inside the valve body so as to be slidable in an axial direction on the valve seat portion and switching a communication state of the valve port; and a biasing member biasing the valve body toward the valve seat portion, a deformation restriction portion is provided between the valve body and the valve main body, the deformation restriction portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve main body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount; a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and either an inner circumferential surface of the valve body or an outer circumferential surface of the valve disc, The valve body has a seal portion that is in sliding contact with a seal surface of the valve seat portion, and a top portion opposite the seal portion, The slide type switching valve, wherein the deformation restricting portion is provided extending from an inner peripheral surface of the valve body toward the top portion of the valve element.

5. A slide-type switching valve comprising: a hollow cylindrical valve body; a valve seat portion having one or more valve ports provided in the valve body; a valve body provided inside the valve body so as to be slidable in an axial direction on the valve seat portion and switching a communication state of the valve port; and a biasing member biasing the valve body toward the valve seat portion, a deformation restriction portion is provided between the valve body and the valve main body, the deformation restriction portion extending from at least one of a part of the valve body and an inner circumferential surface of the valve main body to the other, and restricting deformation of the biasing member from exceeding a predetermined deformation amount; a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and either an inner circumferential surface of the valve body or an outer circumferential surface of the valve disc, The valve body has a seal portion that is in sliding contact with a seal surface of the valve seat portion, an apex portion opposite to the seal portion, and a side portion between the apex portion and the seal portion, A step portion protruding outward in the width direction is provided on each of both width direction sides of the valve body, The deformation restricting portion is provided to extend from an inner circumferential surface of the valve body toward the top side of the valve element beyond the step portion, A slide type switching valve, wherein a predetermined deformation amount of the biasing member is defined by a clearance between the deformation restricting portion and the step portion.

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