Sliding switching valve

Abstract

The present invention provides a sliding switching valve. In the sliding switching valve, by suppressing the deviation of the acting force generated due to the difference in the sliding direction of the valve element and making the pressing load of the valve element against the valve seat portion stable, good operability and sealing performance are obtained. It includes a hollow cylindrical valve body (1) and a valve seat member (4) provided on the valve body (1) and having a plurality of valve ports (4C, 4S, 4E). In addition, it includes a valve element (2) slidably provided inside the valve body (1) in the axial direction (X) and a leaf spring (3) that applies a force to the valve element (2) toward the valve seat member (4). The leaf spring (3) includes: a base portion (31) that is mounted on the top of the valve element (2); an extension portion (32) that extends radially outward from the base portion (31) in a cross-sectional plane intersecting the axial direction (X); and a contact portion (33) that is provided at the front end of the extension portion (32) and can contact the inner peripheral surface of the valve body (1).

Description

Technical Field

[0001] The present invention relates to a sliding switching valve applicable to a refrigeration cycle system such as an air conditioner. Background Art

[0002] Conventionally, as a switching valve for switching a refrigerant flow path in a refrigeration cycle or the like, a sliding switching valve (Patent Document 1) including a cylindrical valve body, a bowl-shaped valve element slidably disposed inside the valve body, and a valve seat portion fixed to the valve body and having a plurality of valve ports is known. Further, a biasing member is fixed to the valve element, and the valve element is biased toward the valve seat portion by the biasing member, whereby a pressing load is applied to the seat surface of the valve seat portion.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 62-200155 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the above-described conventional switching valve, the biasing member has a V shape extending from the top of the valve element to one side and the other side in the sliding direction, and the front ends of one side and the other side are in sliding contact with the inner peripheral surface of the valve body. Therefore, the front end of the biasing member is likely to catch on the inner peripheral surface of the valve body, and the load becomes stronger when the V-shaped portion is tightened due to the difference in the sliding direction of the valve element, and the load becomes weaker when released, resulting in a deviation in the acting force, and the sealing performance of the valve element may become unstable.

[0008] An object of the present invention is to obtain good operability and sealing performance of the valve seat portion with respect to the valve element by suppressing a deviation in the acting force caused by the difference in the sliding direction of the valve element and stabilizing the pressing load of the valve element toward the valve seat portion in a sliding switching valve.

[0009] Means for Solving the Problems

[0010] The sliding switching valve of the present invention includes: a hollow cylindrical valve body; a valve seat portion provided on the valve body and having a plurality of valve ports; a valve core slidably provided inside the valve body in the axial direction; and a biasing member that biases the valve core toward the valve seat portion. The sliding switching valve is characterized in that the valve core is formed in a bowl shape opening toward the valve seat portion, and the open end edge of the valve core serves as a sealing portion that slidably contacts the sealing surface of the valve seat portion. The biasing member has: a mounting portion mounted on the top of the valve core on the side opposite to the sealing portion; an extending portion extending radially outward from the mounting portion in a cross-sectional plane intersecting the axial direction; and a contact portion provided at the front end of the extending portion and capable of contacting the inner peripheral surface of the valve body.

[0011] At this time, preferably, the sliding switching valve is characterized in that the extending portion of the biasing member has a base end portion connected to the mounting portion and a folded-back portion that folds back from the base end portion and extends in the opposite direction, and the contact portion is provided at the front end of the folded-back portion.

[0012] In addition, preferably, the sliding switching valve is characterized in that the biasing member is constituted by a leaf spring in which the mounting portion, the extending portion, and the contact portion are integrated.

[0013] In addition, preferably, the sliding switching valve is characterized in that the contact portion of the biasing member is formed in a convex spherical shape toward the inner peripheral surface of the valve body.

[0014] In addition, preferably, the sliding switching valve is characterized in that the contact portion of the biasing member is provided at a plurality of positions in the axial direction.

[0015] In addition, preferably, the sliding switching valve is characterized in that the mounting portion of the biasing member is formed in a plate shape extending in the axial direction, and is fixed to the valve core at one place in the central portion thereof, and a restricting portion that abuts against the side edge of the mounting portion and restricts rotation is provided on the valve core.

[0016] Effects of the Invention

[0017] According to the sliding switching valve of the present invention, it is possible to suppress the deviation of the acting force caused by the difference in the sliding direction of the valve core, and it is difficult for the front end of the biasing member to catch on the inner peripheral surface of the valve body. By stabilizing the pressing load of the valve core against the valve seat portion, good operability and sealing performance of the valve core with respect to the valve seat portion can be obtained. Description of the Drawings

[0018] Figure 1 is a longitudinal sectional view of the first state of the sliding switching valve according to the embodiment of the present invention.

[0019] Figure 2It is a longitudinal sectional view of the second state of the sliding switching valve according to the embodiment.

[0020] Figure 3 It is Figure 1 a sectional view taken along the A-A direction of

[0021] Figure 4 a perspective view and a top view of the valve core in the sliding switching valve according to the embodiment.

[0022] Figure 5 a perspective view of the contact portion side, a top view, and a perspective view of the mounting portion side of the leaf spring (biasing member) in the sliding switching valve according to the embodiment.

[0023] Figure 6 a top view of the modified example of the leaf spring (biasing member) in the sliding switching valve according to the embodiment, a sectional view corresponding to A-A, and a top view of the valve core.

[0024] In the figure:

[0025] 1 - valve body, 1A - valve chamber, 11 - side wall portion, 12 - bottom, 13E - first port, 13C - second port, 13S - outlet port, 13D - inlet port, 2 - valve core, 21 - bulging portion, 21a - boss portion, 21b - restricting portion, 23 - guide shaft, 23a - internal thread portion, 3 - leaf spring (biasing member), 31 - base portion (mounting portion), 32 - extending portion, 33 - contact portion, 4 - valve seat member (valve seat portion), 4A - valve seat surface, 4B - fixing surface, 5 - housing, 51E - housing side flow path, 51C - housing side flow path, 51S - housing side flow path, 51D - housing side flow path, 6 - bracket portion, 61 - valve guiding portion, 62 - bearing portion, 63 - fixing cover, 7 - magnetic rotor, 71 - rotor shaft, 71a - external thread portion, 8 - stator coil. Specific Embodiments

[0026] Hereinafter, embodiments of the sliding switching valve of the present invention will be described with reference to the accompanying drawings. Figure 1 It is a longitudinal sectional view of the first state of the sliding switching valve according to the embodiment of the present invention, Figure 2 it is a longitudinal sectional view of the second state of the sliding switching valve according to the embodiment, Figure 3 it is Figure 1 a sectional view taken along the A-A direction of Figure 4 a perspective view and a top view of the valve core in the sliding switching valve according to the embodiment, Figure 5 a perspective view of the contact portion side, a top view, and a perspective view of the mounting portion side of the leaf spring (biasing member) in the sliding switching valve according to the embodiment. In addition, the concept of "up and down" in the following description corresponds to up and down in the Figure 1 and Figure 2 accompanying drawings.

[0027] As Figure 1 shown, the sliding switching valve includes a valve body 1, a valve core 2, a leaf spring 3 as a "biasing member", a valve seat member 4 as a "valve seat portion", a housing 5, a bracket portion 6, a magnetic rotor 7, and a stator coil 8.

[0028] The valve body 1 is formed into a substantially cylindrical shape by resin molding, and has a substantially cylindrical valve chamber 1A inside thereof. In addition, the valve body 1 has a side wall portion 11 parallel to the sliding direction of the valve core 2 and parallel to the axis X, and a bottom portion 12 intersecting the side wall portion 11. Further, a first port 13E, an outlet port 13S, and a second port 13C are provided in the side wall portion 11 of the valve body 1, and an inlet port 13D is provided in the bottom portion 12 of the valve body 1. In addition, the first port 13E, the outlet port 13S, and the second port 13C are arranged in a straight line along a part of the side wall portion 11 in the sliding direction of the valve core 2. Further, an engaging projection 1B is formed on the outer side surface of the valve body 1, and the rotational position of the valve body 1 relative to the housing 5 is restricted by engaging with an engaging groove 5B. Thereby, it is possible to easily perform alignment of the relative positions of the first port 13E, the outlet port 13S, and the second port 13C of the valve body 1 with the housing-side flow paths 51E, 51S, 51C on the housing 5 side described later, and the assembly of the valve body 1 relative to the housing 5 becomes easy. In addition, an engaging groove may be provided on the valve body 1 side, and the rotational position of the valve body 1 relative to the housing 5 may be restricted by providing an engaging projection on the housing 5 side. In addition, in this embodiment, the material is a resin such as polyphenylene sulfide (PPS), but in addition, it may be made of an appropriate material such as a metal such as brass, iron, aluminum, or stainless steel.

[0029] The valve core 2 is mainly made of a resin such as polyphenylene sulfide (PPS), and has a bowl-shaped bulging portion 21 opening toward the valve seat member 4 (valve seat portion) and a hook portion 22 extending from the bulging portion 21 toward the bracket portion 5 side, and a bowl-shaped concave portion 21A is formed inside the bulging portion 21. In addition, the opening end edge of the bulging portion 21 is a sealing portion 2B that slidably contacts the "sealing surface", i.e., the valve seat surface 4A, of the valve seat member 4. Moreover, the valve core 2 is at the switching end position on the lower side (first state), and the outlet port 13S is communicated with the first port 13E through the bowl-shaped concave portion 21A. At this time, the second port 13C is communicated with the inlet port 13D in the valve chamber 1A. In addition, the valve core 2 is at the switching end position on the upper side (second state), and the outlet port 13S is communicated with the second port 13C through the bowl-shaped concave portion 21A. At this time, the first port 13E is communicated with the outlet port 13D in the valve chamber 1A. Figure 1 the lower side (first state), and the outlet port 13S is communicated with the first port 13E through the bowl-shaped concave portion 21A. At this time, the second port 13C is communicated with the inlet port 13D in the valve chamber 1A. In addition, the valve core 2 is at the switching end position on the upper side (second state), and the outlet port 13S is communicated with the second port 13C through the bowl-shaped concave portion 21A. At this time, the first port 13E is communicated with the outlet port 13D in the valve chamber 1A. Figure 2 the upper side (second state), and the outlet port 13S is communicated with the second port 13C through the bowl-shaped concave portion 21A. At this time, the first port 13E is communicated with the inlet port 13D in the valve chamber 1A.

[0030] In addition, the hook portion 22 of the valve element 2 engages with the end portion of the rounded-corner prism-shaped guide shaft 23 extending along the axis X. That is, the guide shaft 23 is inserted into the support portion 6 and has an engagement groove 231 on the outer periphery on the valve element 2 side, and the hook portions 22 of the pair of valve elements 2 engage with the engagement groove 231. Moreover, an internal thread portion 23a and its threaded hole coaxial with the axis X are formed in the center of the guide shaft 23. And a leaf spring 3 as a "biasing member" is mounted on the top of the bulging portion 21 of the valve element 2.

[0031] The leaf spring (3) (biasing member) has: a base portion (31) as a "mounting portion", which is mounted on the top of the valve element (2) on the side opposite to the sealing portion (2B); a pair of extending portions (32), which extend radially outward from the base portion (31) in a cross-sectional plane intersecting the axis (X) direction; and a convex contact portion (33), which is provided at the front end of the extending portion (32) and can contact the inner peripheral surface of the valve body (1). The base portion (31), the extending portions (32), and the contact portion (33) are integrally formed from a material such as a spring steel strip of SUS, special steel, etc. by stamping or the like. In addition, the "radial direction" means the radial direction of the circumference centered on the axis X.

[0032] A convex portion 21a is formed in the center of the top of the valve element 2, and a restricting portion 21b extending parallel to the sliding direction (axis X direction) is formed beside the convex portion 21a. In addition, a mounting hole 34 is formed in the center of the base portion 31 of the leaf spring 3 in the axis X direction. And the convex portion 21a engages with the mounting hole 34 at the central portion 1 of the base portion 31. Due to the elastic force of the extending portion 32 generated by bringing the contact portion 33 into contact with the inner peripheral surface of the valve body 1, the leaf spring 3 (base portion 31) is fixed to the top of the valve element 2, and the sealing portion 2B of the valve element 2 is pressed by the valve seat surface 4A of the valve seat member 4. In addition, one side edge of the base portion 31 of the leaf spring 3 abuts against the restricting portion 21b, whereby the rotation of the leaf spring 3 is restricted. In addition, the fixing of the leaf spring 3 to the top of the valve element 2 can be performed by using an adhesive regardless of the above method, or by melting the convex portion 21a with heat to perform welding, as long as it is fixed by an appropriate method.

[0033] In addition, in the present embodiment, the extending portion 32 of the leaf spring 3 (biasing member) has a base end portion 32a connected to the base portion 31 (mounting portion) and a folded-back portion 32b that folds back from the base end portion 32a and extends in the opposite direction. And a contact portion 33 is provided at the front end of the folded-back portion 32b.

[0034] In the valve chamber 1A of the valve body 1, a valve seat member 4 as a "sliding contact member" is provided. The valve seat member 4 is composed of a thin metal plate that is adhesively fixed to the valve body 1 using an adhesive or the like, or is integrally molded and fixed with the valve body 1. It is processed by stamping or the like, and a housing 15 is fixed to the end of the valve body 1 on the side opposite to the bottom 12. The surface on the axis X side of the valve seat member 4 becomes a valve seat surface 4A that is in sliding contact with the valve core 2, and a valve port 4E opposed to the first port 13E, a valve port 4S opposed to the outlet port 13S, and a valve port 4C opposed to the second port 13C are formed in the valve seat member 4. In addition, chamfers composed of an arc surface (R surface) and a tapered surface are formed on the inner peripheral edge on the valve seat surface 4A side of the valve ports 4S, 4E, and 4C. When the valve core 2 slides on the valve seat surface 4A, the valve core 2 will not catch on the edges of the valve ports 4S, 4E, and 4C and can obtain stable operation. In addition, the material of the valve seat member 4 may be appropriately composed of metals such as brass, iron, aluminum, and stainless steel. In addition, in addition to stamping, the processing method can also be machining from a plate.

[0035] The housing 5 is made of aluminum die-casting and has a storage chamber 5A with a substantially cylindrical shape centered on the axis X. The valve body 1 is stored in the storage chamber 5A. The housing 5 has an engagement groove 5B on its inner circumference that engages with the engagement protrusion 1B of the valve body 1. In addition, the valve body 1 and the housing 5 are sealed by an O-ring 10 at a predetermined position. In addition, housing-side flow paths 51E, 51S, and 51C that open in the side wall portion of the storage chamber 5A are formed in the housing 5, and are respectively communicated with the first port 13E, the outlet port 13S, and the second port 13C on the valve body 1 side through the gap between the valve body 1 and the housing 5. In addition, a housing-side flow path 51D is formed at a position of the housing 5 that faces the bottom 12 of the valve body 1, and is communicated with the valve chamber 1A through the inlet port 13D.

[0036] The support portion 6 is mainly made of resin and is composed of a substantially cylindrical valve guide portion 61, a bearing portion 62 formed at the upper end portion of the valve guide portion 61, and a substantially disk-shaped fixing cover 63 made of metal and provided on the outer circumference of the valve guide portion 61 by insert molding. And the support portion 6 is fixed to the upper end portion of the housing 15 fixed to the valve body 1 via the fixing cover 63 by welding. In addition, a C-ring 20 for fixing the housing 5 and the valve body 1 is fitted between the upper end portion of the housing 5 and the fixing cover 63. A guide hole 61a that is coaxial with the axis X and has a rounded prism cavity is formed in the valve guide portion 61. And a guide shaft 23 that engages with the hook portion 22 of the valve core 2 is inserted into the guide hole 61a.

[0037] In addition, a housing 64 that seals the interior of the valve chamber 1A of the valve body and the housing 15 is fixed to the fixed cover 63. A magnetic rotor 7 is housed within the housing 64. A rotor shaft 71 is installed at the center of the magnetic rotor 7. An external thread portion 71a that is threadedly engaged with an internal thread portion 23a of a guide shaft 23 that engages with the valve element 2 is formed on the outer circumference of the rotor shaft 71 on the valve element 2 side. In addition, the rotor shaft 71 is supported by a bearing portion 62 of the support portion 6. Thus, the magnetic rotor 7 is rotatably supported within the housing 64. Further, sliding washers 66 and 67 are disposed between the bearing portion 62 and the flange portion 72 of the rotor shaft 71, and between the magnetic rotor 7 and the bearing portion 62, above the guide hole 61a.

[0038] The stator coil 8 is formed by laminating a pair of coil portions in the axial direction X by winding and installing coil 82A and coil 82B on a resin bobbin 81. A yoke (magnetic yoke) 83 having magnetic pole teeth 83a is integrally assembled to the bobbin 81 by molding. In addition, the stator coil 8 has a cylindrical insertion hole 8H centered on the axis X at the center. A part of the inner circumferential surface of the insertion hole 8H is provided with the magnetic pole teeth 83a of the yoke 83. And the stator coil 8 is installed on the valve body 1 by being inserted into the insertion hole 8H through the housing 64 of the valve body 1. Thus, the magnetic pole teeth 83a of the stator coil 8 are disposed opposite to the outer circumferential surface of the housing 64.

[0039] With the above structure, by applying a pulse output to the coil 82A and coil 82B of the stator coil 8, magnetic lines of force are generated in the coil 82A and coil 82B. Thus, the magnetic poles (N and S poles) of the magnetic pole teeth 83a alternate, generating a magnetic attraction force and a magnetic repulsive force on the magnetic rotor 7, and the magnetic rotor 7 and the rotor shaft 71 rotate. Thus, using a thread feed mechanism based on the external thread portion 71a of the rotor shaft 71 and the internal thread portion 23a of the guide shaft 23 that engages with the valve element 2, the guide shaft 23 moves in the axial direction X, and the valve element 2 slides in the axial direction X together with the guide shaft 23. And from Figure 1 the first state to Figure 2 the second state, or from Figure 2 the second state to Figure 1 the first state to switch the flow path.

[0040] The housing side flow path 51D is connected to the discharge port of the compressor, and high-temperature and high-pressure refrigerant is introduced into the valve chamber 1A of the valve body 1. The housing side flow path 51S is connected to the suction port of the compressor to return the refrigerant to the compressor. In addition, the housing side flow path 51E communicates with the evaporator of the refrigeration cycle, and the housing side flow path 51C communicates with the condenser of the refrigeration cycle. And in Figure 1 the first state, the high-temperature refrigerant flowing in from the inlet port 13D flows through the valve chamber 1A to the second port 13C. In Figure 2In the second state, the high-temperature refrigerant flowing in from the inlet port 13D flows through the valve chamber 1A to the first port 13E.

[0041] As described above, the leaf spring 3 as the "biasing member" has: a base portion 31 (mounting portion) mounted on the top of the valve element 2 on the side opposite to the sealing portion 2B; an extension portion 32 extending radially outward from the base portion 31 in a cross-sectional plane intersecting the axis X direction; and a contact portion 33 provided at the front end of the extension portion 32 and capable of contacting the inner peripheral surface of the valve body 1. Therefore, a biasing force can be applied from the top of the valve element 2 toward the valve seat surface 4A side. In addition, since it intersects the sliding direction and contacts the inner peripheral surface of the valve body 1, deviation of the biasing force caused by different sliding directions of the valve element can be suppressed, and the front end of the leaf spring 3 is not easily caught on the inner peripheral surface of the valve body 1. Therefore, the sealing portion 2B of the valve element 2 can stabilize the load pressing the valve seat surface 4A of the valve seat member 4, and the sliding resistance between the sealing portion 2B and the valve seat surface 4A is also stable. Thus, good operability and sealing performance between the valve element 2 and the valve seat member 4 can be obtained. In addition, it is not necessary to increase the size of the actuator, and the actuator can be miniaturized. In addition, if the portion of the inner peripheral surface of the main body 1 that contacts the contact portion 33 is formed by a plane parallel to the valve seat surface 4A, change in the biasing force of the leaf spring 3 when the valve element 2 operates can be suppressed, which is preferable.

[0042] In addition, in the present embodiment, the protruding portion 32 of the leaf spring 3 (biasing member) has a base end portion 32a connected to the base portion 31 (mounting portion), and a folded-back portion 32b that is folded back from the base end portion 32a and extends in the opposite direction. And a contact portion 33 is provided at the front end of the folded-back portion 32b. In this way, the extending portion 32 is formed in a "く" shape having a base end portion 32a and a folded-back portion 32b. Therefore, by changing the height of the "く" or the length of the extending portion 32, it is easy to adjust the pressing load applied to the valve element 2. In addition, the leaf spring 3 is integrally formed with the base portion 31 (mounting portion), the extending portion 32, and the contact portion 33. Therefore, miniaturization of the leaf spring 3 can be achieved. Further, in the present embodiment, the base portion 31 of the leaf spring 3 is integrally formed with the extending portion 32 and the contact portion 33, but the base portion 31, the extending portion 32, and the contact portion 33 may be separate components, and the extending portion 32 may be fixed to the plate-shaped base portion 31 by welding or the like. In addition, the contact portion 33 of the leaf spring 3 is formed in a convex spherical shape facing the inner peripheral surface of the valve body 1. In this way, since the contact portion 33 is formed in a spherical shape, it is less likely to get caught when the contact portion 33 abuts against the inner peripheral surface of the valve body 1 and moves in the sliding direction. Further, if the center of the convex spherical shape that abuts against the inner peripheral surface of the valve body 1 is formed on the axis center line in the sealing portion 2B of the valve element 2, it is easy to vertically apply a pressing load to the sealing portion 2B from the top of the valve element 2. Therefore, a uniform pressing load is applied to the entire surface of the sealing portion 2B, and better operability and sealing performance between the valve element 2 and the valve seat member 4 are obtained, which is therefore preferable. In addition, in this embodiment, the contact portion 33 is formed in a convex spherical shape facing the inner peripheral surface of the valve body 1, but if a concave portion or an opening is formed facing the inner peripheral surface of the main body 1, and a ball made of SUS or the like is fixed to the concave portion or the opening so that the spherical surface of the ball contacts, the sliding resistance with the inner peripheral surface of the valve body 1 is further reduced, which is therefore preferable.

[0043] In addition, the contact portions 33 of the leaf spring 3 are provided at a plurality of positions (two positions) along the axis X direction. In this way, since a plurality of contact portions 33 are provided, the pressing load required for each portion of the contact portion 33 becomes smaller. Therefore, thinning of the leaf spring 3 can be achieved, and the sliding resistance between the sealing portion 2B and the valve seat surface 4A, and between the contact portion 33 and the inner peripheral surface of the valve body 1 becomes smaller, and wear of each sliding surface can be suppressed. In addition, the base portion 31 (mounting portion) of the leaf spring 3 is formed in a plate shape extending along the axis X direction, and is fixed to the valve element 2 at one position in the center thereof. And a restricting portion 21b that abuts against the side edge of the base portion 31 and restricts rotation is provided on the valve element 2. In this way, since the base portion 31 is formed in a plate shape extending along the axis X direction, the installation area with the valve element 2 can be increased, and thus a pressing load can be uniformly applied to the entire surface of the sealing portion 2B. In addition, since the restricting portion 21b is provided, the leaf spring 3 does not shift even when the valve element 2 operates.

[0044] Figure 6The top view of the leaf spring (sliding contact member) which is a modified example of the sliding switching valve of the embodiment, the view corresponding to the A-A cross-sectional view, and the top view of the valve element. In this modified example, a leaf spring 9 as a "biasing member" is provided on the top of the valve element 2. The leaf spring 9 has: a base portion 91 as an "attachment portion", which is attached to the top of the valve element 2 on the side opposite to the sealing portion 2B; two pairs (four sets) of extension portions 92, which extend radially outward from the base portion 91 in a cross-sectional plane intersecting the axis X direction; and two pairs (four sets) of convex contact portions 93, which are provided at the front ends of the extension portions 92 and can contact the inner peripheral surface of the valve body 1. In addition, a mounting hole 94 is formed at the center of the base portion 91 of the leaf spring 9 in the axis X direction. And, the boss portion 21a is engaged with the mounting hole 94 at one central portion of the base portion 91, and by the elastic force of the extension portion 92 generated by bringing the contact portion 93 into contact with the inner peripheral surface of the valve body 1, the leaf spring 9 (base portion 91) is fixed to the top of the valve element 2, and the sealing portion 2B of the valve element 2 is pressed against the valve seat surface 4A of the valve seat member 4. In this modified example, the two pairs (four sets) of extension portions 92 of the leaf spring 9 are formed at positions symmetric with respect to the axis X, so that the four contact portions 93 can contact the inner peripheral surface of the valve body 1 at equal positions, and the posture of the valve element 2 can be stabilized.

[0045] As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific structure is not limited to these embodiments, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.

Claims

1. A sliding switching valve, comprising: a hollow cylindrical valve body; a valve seat portion provided on the valve body and having a plurality of valve ports; a valve core slidably provided inside the valve body in the axial direction; and a biasing member that biases the valve core toward the valve seat portion. The sliding switching valve is characterized in that the valve core is formed in a bowl shape opening toward the valve seat portion, and the open end edge of the valve core forms a sealing portion that slidably contacts the sealing surface of the valve seat portion. The biasing member has: a mounting portion mounted on the top of the valve core on the side opposite to the sealing portion; an extending portion having a portion extending linearly radially outward from the mounting portion in a cross-sectional plane orthogonal to the sealing surface and intersecting the axial direction; and a contact portion provided at the front end of the extending portion and capable of contacting the inner peripheral surface of the valve body.

2. The sliding switching valve according to claim 1, characterized in that the extending portion of the biasing member has a base end portion connected to the mounting portion and a folded-back portion that folds back from the base end portion and extends in the opposite direction, and the contact portion is provided at the front end of the folded-back portion.

3. The sliding switching valve according to claim 1, characterized in that the biasing member is composed of a leaf spring in which the mounting portion, the extending portion, and the contact portion are integrated.

4. The sliding switching valve according to claim 1, characterized in that the contact portion of the biasing member is formed in a convex spherical shape toward the inner peripheral surface of the valve body.

5. The sliding switching valve according to claim 1, characterized in that the contact portion of the biasing member is provided at a plurality of positions in the axial direction.

6. The sliding switching valve according to claim 1, characterized in that the mounting portion of the biasing member is formed in a plate shape extending in the axial direction, fixed to the valve core at one place in the central portion thereof, and a restricting portion that abuts against the side edge of the mounting portion and restricts rotation is provided on the valve core.

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