Slide-type switching valve

Abstract

To provide a slide type switching valve capable of improving sealability between a valve element and a valve seat part by devising valve seat part fixing means for suppressing machining cost to position the valve seat part.SOLUTION: A slide type switching valve includes a valve body 2, a valve element 4, and a valve seat part 3. On a fixed face 2bf of the valve body 2, at one end side in the direction of an axial line L and at least one of a pair of lateral sides in the direction perpendicular to the axial line L, guide parts 2cg, 2bg are provided, respectively, which are erected from the fixed face 2bf in the vertical direction to abut on the valve seat part 3. The valve seat part 3 after positioned on the guide parts 2cg, 2bg, is adhered and fixed at its adhesive face 34 to the fixed face 2bf. On the opposite face of at least one of the guide parts 2cg, 2bg and the valve seat part 3, adhesive agent sump parts 61-66 are formed to avoid adhesive agent Ad from extruding from the adhesive face 34 onto a slide contact face 33. As a result, sealability between the valve element 4 and the valve seat part 3 can be improved.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a slide-type switching valve having a guide portion that can come into contact with a valve seat portion. [Background technology]

[0002] In recent years, there has been a demand for improved sealing performance in each device (slide valve) of a refrigeration cycle system in order to improve the coefficient of performance (COP) in the refrigeration cycle system.

[0003] For example, Patent Document 1 (see in particular page 6, line 20 to page 7, line 9 and Figure 5a) describes a slide-type switching valve (hereinafter referred to as a "conventional slide-type switching valve") in which, as positioning means for the valve seat portion and the valve seat receiving portion, a convex portion protruding from the underside of the valve seat portion and a concave groove recessed into the upper surface of the valve seat receiving portion are provided, and the valve seat portion and the valve seat receiving portion are positioned by fitting the convex portion into the concave groove. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent Application Publication No. 101614288 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, a convex portion is provided on the valve seat portion, which makes the processing of the valve seat portion complicated, and the processing of the convex portion causes warping or distortion on the upper surface of the plate-shaped valve seat portion, which may impair the sealing performance with the valve body (hereinafter referred to as the ``first problem of the conventional technology (problem caused by the positioning means of the valve seat portion)'').

[0006] Furthermore, in Patent Document 1 (see in particular page 7, line 20 to page 8, line 1), welding is used as a means of fixing the positioned valve seat portion and valve seat receiving portion, but the surface of the valve seat portion is deformed due to the thermal effects of welding, and it was therefore necessary to perform flattening on the deformed surface of the valve seat portion (hereinafter referred to as the "second conventional problem (problem caused by the fixing means for the valve seat portion)").

[0007] The object of the present invention has been made in view of the above problems, and is to provide a slide-type switching valve that can reduce the processing costs for positioning the valve seat and improve the sealing performance between the valve body and the valve seat by devising a fixing means for the valve seat. [Means for solving the problem]

[0008] In order to solve the above problem, a slide-type switching valve is provided which includes a hollow cylindrical valve body extending along an axial direction, a valve disc provided inside the valve body so as to be slidable along the axial direction, and a plate-shaped valve seat which is fixed to a fixed surface of the valve body and against which the valve disc slides, wherein the valve seat has a plurality of valve ports lined up in the axial direction, a sliding surface against which the valve disc slides, and an adhesive surface located opposite the sliding surface, and at least one of one end side in the axial direction and one of a pair of lateral sides in a direction perpendicular to the axis of the fixed surface of the valve body is provided with a guide section which stands perpendicular to the fixed surface and is able to abut against the valve seat, the valve seat is positioned by the guide section, and the adhesive surface is adhesively fixed to the fixed surface, and an adhesive reservoir section is formed on the opposing surface of at least one of the guide section and the valve seat section to prevent adhesive from spilling out from the adhesive surface onto the sliding surface.

[0009] In the above slide-type switching valve, the total volume of the adhesive reservoir portion may be equal to or greater than the amount of adhesive applied to fix the valve seat portion to the fixing surface.

[0010] Furthermore, in the above-mentioned slide-type switching valve, the adhesive reservoir portion formed on the opposing surface of at least one of the guide portion and the valve seat portion in a direction perpendicular to the axis may have a width greater than the maximum mounting gap between the guide portion and the valve seat portion, and hardened adhesive having a concave surface may be disposed inside the adhesive reservoir portion.

[0011] Furthermore, in the above-mentioned slide-type switching valve, the adhesive reservoir portion formed on the opposing adhesive surfaces of at least one of the guide portion and the valve seat portion in the axial direction may have a width greater than the attachment gap between the guide portion and the valve seat portion, and hardened adhesive having a concave surface may be disposed inside the adhesive reservoir portion.

[0012] Furthermore, in the above-mentioned slide-type switching valve, the guide portion may be provided at one end side in the axial direction and on both sides of a pair of sides in a direction perpendicular to the axis, and a corner R extending along the axial direction may be provided at the corner of the adhesive reservoir portion connecting the fixing surface and the guide portion provided on both sides of the pair of sides.

[0013] Furthermore, in the above-mentioned slide-type switching valve, the radius of curvature of the corner R at a position in the adhesive reservoir portion that has the farthest radius from the axis of the valve body may be 0.5 times or more the plate thickness of the valve seat portion and less than the farthest radius.

[0014] In the slide type switching valve, the radius of curvature of the corner R at a position having the maximum radius farthest from the axis center may be the maximum radius.

[0015] In the slide type switching valve, the corner R may have at least a region recessed with respect to the fixed surface.

[0016] In order to achieve the above object, a slide-type switching valve is provided which includes a hollow cylindrical valve body extending in an axial direction, a valve disc provided inside the valve body so as to be slidable in the axial direction, and a plate-shaped valve seat which is fixed to a fixed surface of the valve body and against which the valve disc slides, wherein the valve seat has a plurality of valve ports arranged in the axial direction, a sliding surface against which the valve disc slides, and an adhesive surface located opposite the sliding surface, and at least one of one end side in the axial direction and one of a pair of sides in a direction perpendicular to the axis of the fixed surface of the valve body is provided with a guide section which stands perpendicular to the fixed surface and is able to abut against the valve seat, the valve seat being positioned by the guide section and the adhesive surface being adhesively fixed to the fixed surface, and an adhesive avoidance space is formed on the outer peripheral surface of the valve disc which faces the guide section so that adhesive which protrudes from the adhesive surface onto the sliding surface does not interfere with the valve body.

[0017] Furthermore, in the above-mentioned slide-type switching valve, the adhesive avoidance space formed on the outer peripheral surface of the valve body facing the guide portion in a direction perpendicular to the axis may be larger than the adhesive overflow width on the sliding contact surface, protrude from the valve body, and be formed by a sliding contact portion that slides against the guide portion.

[0018] In addition, in the above-mentioned slide-type switching valve, the adhesive avoidance space formed on the outer peripheral surface of the valve body facing the guide portion in the axial direction may be larger than the adhesive overflow width on the sliding contact surface, and may be formed by a protruding portion that protrudes from the valve body and abuts against the guide portion. [Effects of the Invention]

[0019] According to the present invention, by devising a fixing means for the valve seat portion, it is possible to provide a slide-type switching valve that can reduce the processing costs for positioning the valve seat portion and improve the sealing performance between the valve body and the valve seat portion. [Brief explanation of the drawings]

[0020] [Figure 1]1 is a cross-sectional view of a slide-type switching valve according to a first embodiment of the present invention. [Figure 2] 1 is a diagram showing a refrigeration cycle system of the present invention. [Figure 3] 2A and 2B are cross-sectional views of the valve body shown in FIG. 1, where (a) is an overall view of the valve body, (b) is a cross-sectional view taken along line IIIb-IIIb shown in (a), and (c) is a cross-sectional view taken along line IIIc-IIIc shown in (a). [Figure 4] 3A and 3B are diagrams illustrating the process of attaching a valve seat to the valve body shown in FIG. 1, where (a) is an overall view of the valve seat shown in FIG. 1, (b) is an arrow view seen from the direction of arrow IVb shown in (a), (c) is an overall view of the valve body shown in FIG. 3A with the valve seat shown in (a) attached, and (d) is a cross-sectional view taken along line IVd-IVd shown in (c). [Figure 5] 1A and 1B are diagrams illustrating the sliding contact state of the valve body with respect to the valve body and valve seat portion in the first embodiment, where (a) is an overall view, (b) is a cross-sectional view along the Vb-Vb line shown in (a), (c) is an enlarged view of the area surrounded by the dashed line Vc shown in (a) in the comparative example, and (d) is an enlarged view of the area surrounded by the dashed line Vd shown in (b) in the comparative example. [Figure 6] 5(c) are enlarged views corresponding to FIG. 5(c) in the first embodiment, where (a) represents mode 1-1 of the first embodiment, (b) represents mode 1-2 of the first embodiment, and (c) represents mode 1-3 of the first embodiment. [Figure 7] 5(d) are enlarged views corresponding to FIG. 5(d) in the first embodiment, where (a) represents mode 2-1 of the first embodiment, (b) represents mode 2-2 of the first embodiment, and (c) represents mode 2-3 of the first embodiment. [Figure 8] 5(b) are enlarged views corresponding to FIG. 5(b) in the first embodiment, where (a) shows mode 3-1 of the first embodiment, (b) shows an enlarged view of the area surrounded by dashed line VIIIb shown in (a), and (c) shows mode 3-2 of the first embodiment corresponding to (b). [Figure 9]8(a) are enlarged views corresponding to FIG. 8(a) in the first embodiment, where (a) shows mode 4-1 of the first embodiment, (b) shows an enlarged view of the area surrounded by dashed line IXb shown in (a), and (c) shows mode 4-2 of the first embodiment corresponding to (b). [Figure 10] 10A and 10B are diagrams illustrating the sliding contact state of the valve body with respect to the valve body and valve seat portion in the second embodiment, where (a) is an overall view, (b) is a cross-sectional view along the Xb-Xb line shown in (a), (c) is an enlarged view of the area surrounded by the dashed line Xc shown in (a) in the second embodiment, and (d) is an enlarged view of the area surrounded by the dashed line Xd shown in (b) in the second embodiment. [Figure 11] 10A and 10B are perspective views of a valve body according to a second embodiment, where FIG. 10A is a top perspective view and FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of the present invention will be described in detail with reference to Figures 1 to 11. However, the present invention is not limited to this embodiment.

[0022] <Terminology> In this specification and the claims, the terms "left," "right," "upper," and "lower" refer to the directions shown in Figures 1, 2, 3(a), 4(a) and 4(c), 5(a) and 5(c), 6, and 10(a) and 10(c). In this specification and the claims, the terms "one end" and "other end" refer to the left side of the axial direction (negative side of the X-axis direction) and the right side of the axial direction (positive side of the X-axis direction), respectively. In this specification and the claims, the term "side" refers to the direction perpendicular to the axial direction (Y-axis direction). In this specification and the claims, the terms "one side" and "other side" refer to the positive side of the Y-axis direction and the negative side of the Y-axis direction. In this specification and the claims, the term "vertical direction" refers to the Z-axis direction. In this specification and the claims, the term "horizontal direction" refers to the XY plane direction. In this specification and the claims, the term "maximum mounting gap" refers to the sum of the mounting gaps between the pair of side guide portions and the valve seat portion in the direction perpendicular to the axis L. In this specification and the claims, the term "concave surface" refers to a surface that is recessed downward. In this specification and the claims, the term "furthest radius" refers to the radius that is farthest from the axis of the valve body. In this specification and the claims, the term "furthest radius position" refers to the position having the radius that is farthest from the axis of the valve body.

[0023] (First embodiment) <About slide-type switching valves> A slide type switching valve 100 of the first embodiment will be described using Figure 1. The slide type switching valve 100 is mainly composed of a hollow cylindrical housing 1, a hollow cylindrical valve body 2, a valve seat 3 provided in the valve body 2 and having multiple valve ports aligned in the direction of axis L, a valve element 4 slidably provided in a valve chamber 2a inside the valve body 2, and a drive unit 5 that drives the valve element 4 to slide. Each component of the slide type switching valve 100 will be described in order below. Here, axis L in the figure is the central axis of the housing 1, the valve body 2, and the drive unit 5. Note that, for the sake of explanation, the slide type switching valve 100 in this embodiment is a four-way switching valve, but is not limited to this and may be, for example, a two-way valve or a three-way switching valve.

[0024] The housing 1 is made of aluminum and is formed in a cylindrical shape with a bottom. An inlet passage 1d is formed in the left wall of the housing 1, and an insertion port 1a for inserting the valve body 2 is formed in the right wall. In addition, a first passage 1e, an outlet passage 1s, and a second passage 1c are formed in this order along the axis L as a plurality of cylindrical flow paths in the bottom wall of the housing 1. Here, as will be described in detail later, the inlet passage 1d and the outlet passage 1s are connected to the discharge port and the suction port, respectively, of the compressor 200 (see FIG. 2), and the first passage 1e and the second passage 1c are connected to either the condenser or the evaporator, respectively.

[0025] The valve body 2 is made of a resin material such as polyphenylene sulfide (PPS) and is formed in a cylindrical shape with a bottom and an axis O. It includes an inner circumferential wall 2b (see FIG. 3(a)), a first end side wall portion 2c (see FIG. 3(a)), and a second end side opening 2d (see FIG. 3(a)), and defines a valve chamber (interior of the valve body) 2a therein. An inlet port 20 communicating with the valve chamber 2a is formed in the first end side wall portion 2c of the valve body 2. A flat fixing surface 2bf (see FIG. 3(a)) is formed on the lower inner circumferential wall 2b of the valve body 2 along the horizontal direction. A first connecting flow path 21, an outlet connecting flow path 22, and a second connecting flow path 23, each consisting of a plurality of cylindrical flow paths, are formed on this fixing surface 2bf in this order along the axis L. Here, the inlet port 20 and the outlet connection flow path 22 are connected to the inlet path 1d and the outlet path 1s, respectively, and the first connection flow path 21 and the second connection flow path 23 are connected to the first path 1e and the second path 1c, respectively. Furthermore, a cylindrical metal lower cover 24 is fixed to the right end of the valve body 2 by insert molding. As will be described in detail later, an upper cover 25, which is fixed to the partition wall member 54 by insert molding, is fixed to this lower cover 24 by welding or the like. In addition, O-rings 26 are provided on either the outer circumferential wall of the valve body 2 or the inner circumferential wall of the housing 1, and are arranged in a plurality of grooves G at predetermined intervals along the axis L direction. Therefore, when the valve body 2 is inserted into the housing 1 through the insertion port 1a of the housing 1 and fixed to the housing 1 via the top cover 25 by the C-shaped retaining ring 27, the O-ring 26 seals the inlet path 1d, the second path 1c, the outlet path 1s, the first path 1e, and the outside (atmosphere) of the housing 1 between the valve body 2 and the housing 1. Note that the valve seat 3 is adhesively fixed to the valve body 2, as will be described in detail later.

[0026] The valve seat 3 is made of a thin metal plate and is adhesively fixed to the fixing surface 2bf (see FIG. 3(a)) of the valve body 2. The valve seat 3 has a first port 30 communicating with the first connecting flow path 21, an outlet port 31 communicating with the outlet connecting flow path 22, and a second port 32 communicating with the second connecting flow path 23 formed at a predetermined interval in the direction of the axis L. The first port 30, the outlet port 31, and the second port 32 are formed in a cylindrical shape with an inner diameter smaller than the first connecting flow path 21, the outlet connecting flow path 22, and the second connecting flow path 23. The surface of the valve seat 3 facing the valve chamber 2a forms a sliding surface 33.

[0027] The valve body 4 is mainly made of a resin material such as polyphenylene sulfide (PPS), and includes a valve body main body 40 that has the shape of an upside-down bowl-shaped container, and a connecting part 44 that protrudes from the right end in the direction of the axis L. The valve body 4 comes into sliding contact with the sliding surface 33 of the valve seat 3 with its lower surface abutting against it, forming a space between it and the valve seat 3.

[0028] The valve body main body 40 faces the sliding surface 33 of the valve seat portion 3 and has an oval opening edge portion 40a extending in the direction of the axis L, a bowl-shaped portion (the outer peripheral surface of the valve body) 40b protruding from the opening edge portion 40a toward the valve chamber 2a, and a bowl-shaped recess 40c provided inside the bowl-shaped portion 40b.

[0029] The opening edge 40a constitutes a seal portion s that can slide against the sliding surface 33. A spring member 42 is sandwiched between the top of the bowl-shaped portion 40b and the inner peripheral wall of the valve body 2, and this spring member 42 urges the valve body 40 against the valve seat 3, sealing the gap between the valve chamber 2a outside the bowl-shaped portion 40b and the bowl-shaped recess 40c inside the bowl-shaped portion 40b.

[0030] The connecting portion 44 is formed in a hook shape so as to be connected to the driving portion 5. The connecting portion 44 is connected to the driving portion 5 via a shaft member 59, which will be described in detail later.

[0031] The drive unit 5 is a part that drives the valve body 4 to slide, and is equipped with 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.

[0032] The stepping motor 5a includes a can 50 having a cylindrical shape with a bottom, a magnet rotor 51, and a stator coil 52.

[0033] The can 50 is made of a thin metal plate and is formed into a cylindrical shape with a bottom.

[0034] The magnet rotor 51 is a rotor and is disposed inside the can 50 .

[0035] The stator coil 52 is a stator, and is arranged so as to surround the outer periphery of the magnet rotor 51 around the axis L with the can 50 sandwiched therebetween.

[0036] The linear motion mechanism 5b includes a bearing member 53, a partition member 54, a male screw member 55, and a female screw member 56.

[0037] The bearing member 53 is made of a resin material such as polyphenylene sulfide (PPS), is arranged inside the bottom side of the can 50, and has a first bearing hole 53a that is coaxial with the axis L and supports the right end of the male thread member 55.

[0038] The partition member 54 is made of a resin material and is formed into a cylindrical shape with a bottom. A tapered upper cover 25 made of a metal material is fixed to the outer periphery of the partition member 54 by insert molding. The small-diameter portion 25a of the upper cover 25 is fixed to the can 50 by welding or the like to seal the inside of the drive unit 5. The large-diameter portion 25b of the upper cover 25 is fixed to the lower cover 24 by welding or the like. As a result, the central axes of the partition member 54, the can 50, the bearing member 53, and the valve body 2 are arranged coaxially with the axis L. Furthermore, the partition wall 54d, which is the bottom of the partition member 54, has a second bearing hole 54a that supports the left end of the male thread member 55 and a pair of partition holes 54b (only one side is shown in FIG. 1 ) arranged on either side of the second bearing hole 54a, both of which are coaxial with the axis L.

[0039] The male screw member 55 is a rotor shaft having a male screw portion 55d on its outer circumferential surface, and is indirectly fixed to the center of the magnet rotor 51 via a fixing member 55a.

[0040] The female screw member 56 has a female screw portion 56a1 formed on its inner circumferential surface and a threaded cylindrical portion 56a accommodated in the partition wall member 54 with a radial gap therebetween, and a pair of connecting arms 56b (only one side is shown in FIG. 1 ) that are inserted into a pair of partition wall holes 54b in the partition wall member 54 to restrict rotation of the female screw member 56 about the axis L. The pair of connecting arms 56b are connected to the valve body 4 via a shaft 59. The female screw portion 56a1 and the male screw portion 55d are threadedly engaged with each other to form a screw feed mechanism. The threaded engagement area Sa between the female screw portion 56a1 and the male screw portion 55d is always accommodated in the screw-accommodating space Ss defined by the can 50 and the partition wall member 54.

[0041] In the drive unit 5, when the stepping motor 5a rotates the male screw member 55, the screw feed mechanism converts the rotation of the male screw member 55 into linear motion of the female screw member 56. This linear motion of the female screw member 56 drives the valve element 4 connected to the female screw member 56 to move back and forth so as to slide in the direction of the axis L.

[0042] In the present embodiment, the drive unit 5 that drives the valve element 4 to advance and retreat has an externally threaded member 55 indirectly fixed to the magnet rotor 51, but is not limited thereto. For example, the externally threaded member 55 may be directly fixed to the magnet rotor 51. Furthermore, the linear motion mechanism 5b in the present embodiment has an externally threaded member 55 rotatably fixed to the housing 1, and an internally threaded member 56 that slides advance and retreat in the direction of the axis L. However, this is not limited thereto. For example, the linear motion mechanism 5b may have an externally threaded member 55 rotatably fixed to the housing 1, and an internally threaded member 56 that slides advance and retreat in the direction of the axis L. Furthermore, the slide-type switching valve 100 in the present embodiment is used such that the longitudinal axis L is horizontal and the valve element 4 slides horizontally. However, this is not limited thereto. For example, the linear motion mechanism 5b may have an externally threaded member 55 that slides advance and retreat in the direction of the axis L.

[0043] <Operation of the slide type switching valve> 2, the slide-type switching valve 100 is used in a refrigeration cycle system, and a D-type coupling pipe 1D, a C-type coupling pipe 1C, an S-type coupling pipe 1S, and an E-type coupling pipe 1E are attached to the inlet path 1d, the second path 1c, the outlet path 1s, and the first path 1e, respectively. The slide-type switching valve 100 uses a drive unit 5 to drive the valve element 4 back and forth so as to slide in the direction of the axis L, thereby connecting the D-type coupling pipe 1D connected to the discharge port of the compressor 200 and the S-type coupling pipe 1S connected to the suction port of the compressor 200 to either the C-type coupling pipe 1C connected to the outdoor heat exchanger 300 or the E-type coupling pipe 1E connected to the indoor heat exchanger 400, respectively. In this way, the slide-type switching valve 100 switches the fluid paths of the refrigeration cycle system.

[0044] <Operation of the refrigeration cycle system> First, during heating operation, as shown in Fig. 2, the slide type switching valve 100 drives the drive unit 5 to slide the valve element 4 to the left position in the direction of the axis L, and the valve element main body 40 and the valve seat 3 connect the C joint pipe 1C and the S joint pipe 1S via the bowl-shaped recess 40c, and connect the D joint pipe 1D and the E joint pipe 1E via the valve chest 2a and the first port 30. As a result, the high-pressure refrigerant compressed by the compressor 200 flows from the D joint pipe 1D through the valve chest 2a into the E joint pipe 1E, as shown by the solid line in Fig. 2, flows through the indoor heat exchanger 400, the expansion device 500, and the outdoor heat exchanger 300 in this order, flows from the C joint pipe 1C through the bowl-shaped recess 40c into the S joint pipe 1S, and then circulates to the compressor 200. In this case, the outdoor heat exchanger 300 functions as an evaporator, and the indoor heat exchanger 400 functions as a condenser.

[0045] Next, during cooling operation, as shown in Fig. 1, the slide type switching valve 100 drives the drive unit 5 to slide the valve element 4 to the right position in the direction of the axis L, and the valve element main body 40 and the valve seat 3 connect the S joint pipe 1S and the E joint pipe 1E via the bowl-shaped recess 40c, and connect the D joint pipe 1D and the C joint pipe 1C via the valve chest 2a and the second port 32. As a result, the high-pressure refrigerant compressed by the compressor 200 flows from the D joint pipe 1D through the valve chest 2a into the C joint pipe 1C, as shown by the dashed arrow in Fig. 2, flows through the outdoor heat exchanger 300, the expansion device 500, and the indoor heat exchanger 400 in this order, flows from the E joint pipe 1E through the bowl-shaped recess 40c into the S joint pipe 1S, and then circulates to the compressor 200. At this time, during cooling operation, the refrigerant is circulated in the opposite direction to that during heating operation, and the outdoor heat exchanger 300 functions as a condenser, and the indoor heat exchanger 400 functions as an evaporator.

[0046] <Valve seat positioning means> As mentioned above, in conventional slide-type switching valves, the valve seat positioning means was a convex portion formed on the valve seat that was fitted into a concave groove formed in the valve seat receiving portion, which could cause warping or distortion in the sliding surface, which is the upper surface of the valve seat, and could impair the sealing performance with the valve disc. As a result, conventional slide-type switching valves had the first conventional problem (a problem caused by the valve seat positioning means).

[0047] In contrast to this, as will be described in detail later, in the slide-type switching valve 100 of this embodiment, first, in order to solve the first problem (a problem caused by the positioning means of the valve seat portion), the positioning means of the valve seat portion is replaced with a protrusion formed on the valve seat portion, and a guide portion for positioning the valve seat portion provided on the valve body is adopted.

[0048] <About the guide part> As shown in Fig. 3(b), guide portions 2bg, 2cg are formed on the fixing surface 2bf of the valve body 2, extending vertically from the peripheral edge of three sides of the fixing surface 2bf. The guide portions 2bg, 2cg include a one-end guide portion (guide portion) 2cg (see the hatched pattern in Fig. 3) formed on one end of the peripheral edge of the fixing surface 2bf in the direction of the axis L, and a pair of side guide portions (guide portion) 2bg (see the dotted pattern in Fig. 3) formed on a pair of sides of the peripheral edge of the fixing surface 2bf in a direction perpendicular to the axis L. As shown in Figs. 3(a) to 3(c), the one-end guide portion 2cg utilizes the valve chamber 2a side of the one-end side wall portion 2c, while the pair of side guide portions 2bg are formed on the lower side of the inner circumferential wall 2b. Here, in consideration of installation errors, the distance between the pair of side guide portions 2bg in the direction perpendicular to the axis L is set to be slightly larger than the width of the valve seat 3. Furthermore, in order to enable the one-end guide portion 2cg and the pair of side guide portions 2bg to abut against the valve seat 3, the vertical formation area of ​​the one-end guide portion 2cg and the pair of side guide portions 2bg is set to include the area above the valve seat 3, as shown in Figure 4(c).

[0049] In this embodiment, the guide portions 2bg, 2cg are erected from the peripheral edges of three sides of the fixing surface 2bf. However, this is not limiting. Since the valve seat portion 3 can be positioned by the peripheral edges of two sides that share a common corner, the guide portions 2bg may be erected from the peripheral edges of two sides, defined by either one side (the positive side in the Y-axis direction) or the other side (the negative side in the Y-axis direction) of the pair of side guide portions 2bg and the one-end guide portion 2cg. Furthermore, the guide portions 2bg may be erected from the peripheral edges of all four sides of the fixing surface 2bf. Here, the configuration in which the guide portions 2bg are erected from the peripheral edges of three sides of the fixing surface 2bf is preferred because it facilitates insertion and positioning of the valve seat portion 3, which will be described later, on the fixing surface 2bf of the valve body 2.

[0050] <Means for fixing the valve seat> In conventional slide-type switching valves, the valve seat is fixed by welding, and the upper surface of the valve seat, which is the sliding surface, is subject to deformation due to the heat caused by this welding, and therefore it is necessary to perform flattening. As a result, conventional slide-type switching valves have the second conventional problem (a problem caused by the fixing means of the valve seat).

[0051] In contrast, in the slide type switching valve 100 of this embodiment, first, in order to solve the second problem (a problem caused by the fixing means of the valve seat portion), adhesive fixing is adopted instead of welding fixing as the fixing means of the valve seat portion 3. Here, adhesives adopted for adhesive fixing include epoxy resin-based, acrylic resin-based, urethane resin-based, silicone-based, and vinyl acetate-based adhesives.

[0052] <About the valve seat installation process> The process of attaching the valve seat 3 to the valve body 2 will be described using Figure 4. As shown in Figures 4(a) and (b), the valve seat 3 has a sliding surface 33 against which the valve disc 4 slides and an adhesive surface 34 located opposite the sliding surface 33 and to which an adhesive is applied. First, adhesive is applied to the adhesive surface 34. Then, the valve seat 3 is inserted into the valve chamber 2a through the other-end opening 2d of the valve body 2 in the insertion direction M shown in Figure 4(c), and the adhesive surface 34 of the valve seat 3 is pressed against the fixing surface 2bf of the valve body 2 to be adhesively fixed. During this process, the valve seat 3 is positioned in a direction perpendicular to the axis L by the pair of side guide portions 2bg, and slides toward one end in the direction of the axis L. Finally, the valve seat 3 comes into contact with the one-end guide portion 2cg, thereby being positioned in the direction of the axis L. As described above, in this embodiment, by providing the positioning means for the valve seat 3 on the valve body 2 rather than the valve seat 3, the valve seat 3 can be positioned on the valve body 2 without warping or distortion and while maintaining the flatness of the sliding surface 33, thereby solving the first conventional problem (problem caused by the positioning means for the valve seat). In this embodiment, the other end of the valve seat 3 in the axial direction L has a non-linear shape as shown in FIGS. 4(b) and 4(d), which prevents visual errors in the installation direction (axial direction L and front-to-back directions). In addition, in this embodiment, for the sake of explanation, an adhesive is applied to the valve seat 3. However, the present invention is not limited to this. For example, an adhesive may be applied to the fixing surface 2bf of the valve body 2.

[0053] <New issues with the valve seat fixing method (adhesive fixing)> Next, we will use Figure 5 to describe new problems that arise when adhesive fixing is used as a means for fixing the valve seat 3. For the sake of explanation, Figure 5(a) omits the linear motion mechanism 5b connected to the valve body 4 and other components. Figures 5(c) and 5(d) exaggerate the gap between the valve seat 3 and the valve body 2 to emphasize the adhesive Ad (in particular, the adhesive surface 34 of the valve seat 3 and the adhesive surface 34 of the valve body 2 are in contact).

[0054] 5(a) and 5(b), after adhesively fixing the valve seat 3 to the fixing surface 2bf of the valve body 2, the valve element 4 is inserted into the valve chamber 2a from the opening 2d at the other end of the valve body 2, and the opening edge 40a of the valve element 4 is brought into slidable contact with the sliding surface 33 of the valve seat 3. Here, to enable smooth sliding of the valve element 4 in the direction of the axis L, the distance between the pair of side guide portions 2bg is set slightly larger than the width of the valve element 4 in the direction perpendicular to the axis L.

[0055] 5(c) and 5(d), which are comparative examples, when the valve seat 3 is fixed to the valve body 2, the adhesive Ad is extruded vertically upward and horizontally from the adhesive surface 34 of the valve seat 3 through the gap between the valve seat 3 and the valve body 2. As a result, the adhesive Ad is extruded in the movement directions A and B, and hardens in a state where it protrudes from the gap between the valve seat 3 and the valve body 2 onto the sliding surface 33 of the valve seat 3.

[0056] In this way, by using adhesive fixing as a means for fixing the valve seat portion 3, the opening edge portion 40a of the valve body 4, which slides relative to the valve seat portion 3, may ride up on the adhesive Ad, impairing the sealing properties, or may become trapped in the adhesive Ad, causing the valve body 4 to become stuck to the valve seat portion 3, resulting in malfunction.

[0057] In contrast, in the first embodiment, adhesive reservoirs 61-66 are formed to prevent the adhesive Ad from spilling out from the bonding surface 34 of the valve seat portion 3 onto the sliding contact surface 33. Note that, as will be described in detail later, the first embodiment is broadly divided into Mode 1 (one-end side adhesive reservoirs 61-63) and Mode 2 (side adhesive reservoirs 64-66) depending on the formation positions of the adhesive reservoirs 61-66. Below, the first embodiment will be described in the order of Mode 1 of the first embodiment and Mode 2 of the first embodiment.

[0058] (Aspect 1 of the first embodiment) As shown in Figures 6(a) to (c), Mode 1 of the first embodiment consists of three modes, Mode 1-1 to Mode 1-3, depending on the material in which the one-end side adhesive reservoirs 61 to 63 are formed and the shape of the adhesive reservoirs.

[0059] (Mode 1-1) As shown in FIG. 6(a), a recess 2cr is formed at the lower end of the one-end guide portion 2cg, recessed toward one end in the direction of the axis L and extending in a direction perpendicular to the axis L. The one-end adhesive reservoir 61 is defined between the recess 2cr and the opposing surface of the valve seat 3 that faces the recess 2cr, and has a rectangular cross section. Note that, although the one-end adhesive reservoir 61 in Mode 1-1 of this embodiment is formed so as to be continuous in the horizontal direction with the fixing surface 2bf of the valve body 2A, this is not limiting, and it may be formed, for example, on any of the opposing surfaces of the one-end guide portion 2cg that face the valve seat 3.

[0060] The one-end adhesive reservoir 61 has a width X1 in the direction of the axis L, a height Z1 in the vertical direction, and a depth D1 (not shown) in the direction perpendicular to the axis L, with a total volume of X1 × Z1 × D1. The total volume of the one-end adhesive reservoir 61 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3 to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the one-end adhesive reservoir 61, the one-end adhesive reservoir 61 will not be completely filled with adhesive Ad. Furthermore, in the direction of the axis L, the one-end adhesive reservoir 61 has a width X1 that is greater than the attachment gap G1 between the one-end guide 2cg and the valve seat 3 (X1 > G1). As a result, when attaching the adhesive Ad to the fixing surface 2bf of the valve seat portion 3, the pressure of the adhesive Ad increases locally, and even if the adhesive Ad tries to rise through the gap between the one-end guide portion 2cg and the valve seat portion 3 at a relatively high speed, the speed of the adhesive Ad is suppressed because the one-end adhesive reservoir portion 61 is interposed in the path, and as a result, the adhesive Ad can be stored in a stable state inside the one-end adhesive reservoir portion 61.

[0061] Here, when the mounting gap G1≠0, that is, when the one-end guide portion 2cg and the valve seat portion 3 are not in contact, the upper space of the one-end adhesive reservoir portion 61 is in communication with the valve chamber 2a. At this time, the surface tension generated in the adhesive Ad causes the adhesive Ad to be drawn into the one-end adhesive reservoir portion 61. After that, the hardened adhesive Ad having a concave surface is placed inside the one-end adhesive reservoir portion 61.

[0062] On the other hand, when the mounting gap G1=0, that is, when the one-end guide portion 2cg and the valve seat portion 3 are in contact, the upper space of the one-end adhesive reservoir portion 61 communicates with the valve chamber 2a via a gap between a pair of side guide portions 2bg (described below) and the valve seat portion 3 in a direction perpendicular to the axis L, and therefore, due to the surface tension generated in the adhesive Ad, the adhesive Ad is drawn into the one-end adhesive reservoir portion 61, just as in the case where the mounting gap G1≠0. Thereafter, the hardened adhesive Ad having a concave surface is disposed inside the one-end adhesive reservoir portion 61.

[0063] In this way, in mode 1-1 of this embodiment, the one-end guide portion 2cg and adhesive fixing are adopted as the means for fixing the valve seat portion 3 instead of welding fixing, so that the first and second problems (problems caused by the positioning means of the valve seat portion and the fixing means of the valve seat portion) can be resolved, and unlike the comparative example in Figure 5(c), by adopting the one-end adhesive reservoir portion 61, it is possible to prevent the adhesive from spilling out from the adhesive surface 34 of the valve seat portion 3 onto the sliding surface 33, so that a new problem with the fixing means (adhesive fixing) of the valve seat portion can also be resolved.

[0064] As described above, in mode 1-1 of this embodiment, by adopting the one-end side adhesive reservoir portion 61, it is possible to solve all of the first and second problems of the conventional art (problems caused by the positioning means of the valve seat portion and the fixing means of the valve seat portion).

[0065] (Mode 1-2) As shown in FIG. 6(b), a chamfered notch 3c1 is formed in a lower corner of the valve seat 3A so as to extend in a direction perpendicular to the axis L. The one-end adhesive reservoir 62 is defined between the notch 3c1, the one-end guide 2cg, and the fixing surface 2bf and has a triangular cross section. Note that in aspect 1-2 of this embodiment, the one-end adhesive reservoir 62 is formed in the lower corner of the valve seat 3A, but is not limited thereto and may be formed in an upper corner of the valve seat 3A, for example.

[0066] The one-end adhesive reservoir 62 has a width X2 in the axial direction L, a height Z2 in the vertical direction, and a depth D2 (not shown) in the direction perpendicular to the axial line L, with a total volume of (X2 × Z2 × D2) / 2. The total volume of the one-end adhesive reservoir 62 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3A to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the one-end adhesive reservoir 62, the one-end adhesive reservoir 62 will not be completely filled with adhesive Ad. Furthermore, in the axial direction L, the one-end adhesive reservoir 62 has a width X2 that is greater than the mounting gap G1 between the one-end guide 2cg and the valve seat 3 (X2 > G1). As a result, as in mode 1-1, even if the adhesive Ad attempts to rise through the gap between the one-end guide portion 2cg and the valve seat portion 3 at a relatively high speed, the one-end adhesive reservoir portion 62 is inserted in the path, so the speed of the adhesive Ad is suppressed, and as a result, the adhesive Ad can be stored in a stable state inside the one-end adhesive reservoir portion 62.

[0067] Here, when the mounting gap G1≠0, as in mode 1-1, the upper space of the one-end adhesive reservoir 62 is in communication with the valve chamber 2a, and therefore the surface tension generated in the adhesive Ad causes the adhesive Ad to be drawn into the one-end adhesive reservoir 62. After that, the hardened adhesive Ad having a concave surface is placed inside the one-end adhesive reservoir 62.

[0068] On the other hand, when the mounting gap G1=0, as in mode 1-1, the upper space of the one-end adhesive reservoir 61 communicates with the valve chamber 2a via a gap perpendicular to the axis L between a pair of side guide portions 2bg and the valve seat 3 (described below), and the adhesive Ad is drawn into the one-end adhesive reservoir 61 by surface tension generated in the adhesive Ad. After that, the hardened adhesive Ad having a concave surface is placed inside the one-end adhesive reservoir 61.

[0069] In this way, by employing the one-end adhesive reservoir 62 in mode 1-2 of the present embodiment, it is possible to achieve the same effect as mode 1-1 of the present embodiment, that is, to solve all of the first and second problems of the conventional art (problems caused by the valve seat positioning means and the valve seat fixing means). In addition, in mode 1-2 of the present embodiment, the one-end adhesive reservoir 62 is provided by chamfering the plate-shaped valve seat 3A rather than the valve body 2, which has a complex shape, and therefore processing costs can be reduced.

[0070] (Modes 1-3) As shown in Figure 6(c), an upper corner of the valve seat 3B has a step 3s1 that is recessed toward the other end in the direction of the axis L and extends in a direction perpendicular to the axis L. The one-end adhesive reservoir 63 is defined between the step 3s1 and the opposing surface of the one-end guide 2cg that faces the step 3s1, and has a rectangular cross section. Note that in aspect 1-3 of this embodiment, the one-end adhesive reservoir 63 is formed in an upper corner of the valve seat 3B, but is not limited to this. For example, the one-end adhesive reservoir 63 may be formed on any of the opposing surfaces of the valve seat 3B that face the one-end guide 2cg.

[0071] The one-end adhesive reservoir 63 has a width X3 in the axial direction L, a height Z3 in the vertical direction, and a depth D3 (not shown) in the direction perpendicular to the axial line L, with a total volume of (X3 × Z3 × D3). The total volume of the one-end adhesive reservoir 63 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3B to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the one-end adhesive reservoir 63, the one-end adhesive reservoir 63 will not be completely filled with adhesive Ad. Furthermore, in the axial direction L (X-axis direction), the one-end adhesive reservoir 63 has a width X3 that is greater than the attachment gap G1 between the one-end guide 2cg and the valve seat 3B (X3 > G1). As a result, as in mode 1-1, even if the adhesive Ad attempts to rise through the gap between the one-end guide portion 2cg and the valve seat portion 3 at a relatively high speed, the one-end adhesive reservoir portion 63 is inserted in its path, so the speed of the adhesive Ad is suppressed, and as a result, the adhesive Ad can be stored in a stable state inside the one-end adhesive reservoir portion 63.

[0072] In Mode 1-3, whether the mounting gap G1≠0 or G1=0, the upper space of the one-end adhesive reservoir 63 is in communication with the valve chamber 2a, and the surface tension of the adhesive Ad causes the adhesive Ad to be drawn into the one-end adhesive reservoir 63. After that, the hardened adhesive Ad having a concave surface is visibly disposed inside the one-end adhesive reservoir 63. Furthermore, because the one-end adhesive reservoir 63 is located above the gap between the one-end guide 2cg and the valve seat 3, the adhesive area between the one-end guide 2cg and the valve seat 3 is relatively large, thereby improving the adhesive strength of the valve seat 3 to the valve body 2.

[0073] Thus, in Mode 1-3 of this embodiment, by employing the one-end adhesive reservoir 63, the same effect as in Mode 1-1 of this embodiment can be achieved, i.e., all of the first and second problems of the conventional valve seat (problems arising from the valve seat positioning means and valve seat fixing means) can be resolved. Furthermore, Mode 1-3 of this embodiment also achieves the same effect as Mode 1-2 of this embodiment, i.e., the one-end adhesive reservoir 63 is formed by processing a stepped portion into the plate-shaped valve seat 3B, thereby reducing processing costs. Additionally, in Mode 1-3 of this embodiment, the cured adhesive Ad having a concave surface disposed inside the one-end adhesive reservoir 63 is visible, which more reliably prevents the adhesive Ad from spilling onto the sliding contact surface 33. Furthermore, in Mode 1-3 of this embodiment, the adhesive area between the one-end guide portion 2cg and the valve seat 3 is relatively large, thereby improving the adhesive strength of the valve seat 3 to the valve body 2.

[0074] (Aspect 2 of the first embodiment) 7(a) to 7(c), Mode 2 of the first embodiment is divided into three modes, Mode 2-1 to Mode 2-3, depending on the material in which the side adhesive reservoirs 64 to 66 are formed and the shape of the adhesive reservoirs. The spacing between the pair of side guide portions 2bg is set slightly larger than the width of the valve seat 3 in the direction perpendicular to the axis L, taking into account installation errors. The maximum installation gap G2 is the gap that occurs when the valve seat 3 is installed offset toward one of the pair of side guide portions 2bg in the direction perpendicular to the axis L, i.e., the sum of the installation gaps between the pair of side guide portions 2bg and the valve seat 3, and is set to a value greater than zero (G2>0).

[0075] (Mode 2-1) As shown in FIG. 7(a), a recess 2br is formed at the lower end of the side guide portion 2bg, recessed to one side in a direction perpendicular to the axis L (the positive side in the Y-axis direction) and extending in the direction of the axis L. The side adhesive reservoir 64 is defined between the recess 2br and the opposing surface of the valve seat 3 that faces the recess 2br, and has a rectangular cross section. Note that in aspect 2-1 of this embodiment, the side adhesive reservoir 64 is formed so as to be continuous with the fixing surface 2bf of the valve body 2B in the horizontal direction, but is not limited to this. For example, the side adhesive reservoir 64 may be formed on any of the opposing surfaces of the side guide portion 2bg that face the valve seat 3.

[0076] This side adhesive reservoir 64 has a width Y1 in the direction perpendicular to the axis L, a height Z4 in the vertical direction, and a depth D4 (not shown) in the direction of the axis L, with a total volume of Y1 × Z4 × D4. The total volume of this side adhesive reservoir 64 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3 to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the side adhesive reservoir 64, the side adhesive reservoir 64 will not be completely filled with adhesive Ad. Furthermore, in the direction perpendicular to the axis L, the side adhesive reservoir 64 has a width Y1 that is greater than the maximum mounting gap G2 between the side guide portion 2bg and the valve seat 3 (Y1 > G2). As a result, when attaching the adhesive Ad to the fixing surface 2bf of the valve seat portion 3, the pressure of the adhesive Ad increases locally, and even if the adhesive Ad tries to rise through the gap between the lateral guide portion 2bg and the valve seat portion 3 at a relatively high speed, the speed of the adhesive Ad is suppressed because the lateral adhesive reservoir portion 64 is interposed in the path, and as a result, the adhesive Ad can be stored in a stable state inside the lateral adhesive reservoir portion 64.

[0077] As shown in Figure 7(a), the upper space of the side adhesive reservoir 64 is in communication with the valve chamber 2a. At this time, due to the surface tension generated in the adhesive Ad, the adhesive Ad is drawn into the side adhesive reservoir 64. After that, the hardened adhesive Ad having a concave surface is placed inside the side adhesive reservoir 64.

[0078] Thus, by employing the side adhesive reservoir 64 in Mode 2-1 of this embodiment, the same effect as Mode 1-1 of this embodiment can be achieved, that is, the first and second problems of the conventional valve seat (problems caused by the valve seat positioning means and the valve seat fixing means) can all be resolved. Additionally, in Mode 2-1 of this embodiment, the side guide portion 2bg in which the recess 2br is formed is open to the other end in the axial direction L (the right side in the drawing) as shown in FIG. 4(d). This allows the adhesive Ad stored in the side adhesive reservoir 64 to flow out from the open side of the side adhesive reservoir 64 before hardening. This more reliably prevents the adhesive Ad from spilling onto the sliding surface 33. At this time, the adhesive Ad flows from the sliding surface 33 of the valve seat 3 onto the fixing surface 2bf (see FIG. 4(c)), which is spaced downward, so the opening edge 40a of the valve body 4 does not interfere with the adhesive Ad.

[0079] (Mode 2-2) As shown in FIG. 7(b), a chamfered notch 3c2 is formed in a lower corner of the valve seat 3C on one side (the positive side in the Y-axis direction) in a direction perpendicular to the axis L so as to extend in the direction of the axis L. The side adhesive reservoir 65 is defined between the notch 3c2, the side guide portion 2bg, and the fixing surface 2bf and has a triangular cross section. Note that in aspect 2-2 of this embodiment, the side adhesive reservoir 65 is formed in the lower corner of the valve seat 3C, but is not limited thereto, and may be formed in an upper corner of the valve seat 3C, for example.

[0080] This side adhesive reservoir 65 has a width Y2 in the direction perpendicular to the axis L, a height Z5 in the vertical direction, and a depth D5 (not shown) in the direction of the axis L, with a total volume of (Y2 × Z5 × D5) / 2. The total volume of this side adhesive reservoir 65 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3 to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the side adhesive reservoir 65, the side adhesive reservoir 65 will not be completely filled with adhesive Ad. Furthermore, in the direction perpendicular to the axis L, the side adhesive reservoir 65 has a width Y2 greater than the maximum mounting gap G2 between the side guide portion 2bg and the valve seat 3C (Y2 > G2). As a result, as in mode 2-1, even if the adhesive Ad attempts to rise through the gap between the lateral guide portion 2bg and the valve seat portion 3 at a relatively high speed, the speed of the adhesive Ad is suppressed because the lateral adhesive reservoir portion 65 is interposed in its path, and as a result, the adhesive Ad can be stored in a stable state inside the lateral adhesive reservoir portion 65.

[0081] 7(b), as in mode 2-1, the upper space of the side adhesive reservoir 65 is in communication with the valve chamber 2a, and therefore, due to the surface tension generated in the adhesive Ad, the adhesive Ad is drawn into the side adhesive reservoir 65. After that, the hardened adhesive Ad having a concave surface is placed inside the side adhesive reservoir 65.

[0082] In this way, by employing the side adhesive reservoir 65 in Mode 2-2 of the present embodiment, the same effect as Mode 2-1 of the present embodiment is achieved, that is, the first and second conventional problems (problems caused by the valve seat positioning means and the valve seat fixing means) are all resolved, and the adhesive Ad is caused to flow out from the open side of the side adhesive reservoir 65, more reliably preventing the adhesive Ad from spilling onto the sliding surface 33. Additionally, in Mode 2-2 of the present embodiment, the side adhesive reservoir 65 is provided by chamfering the plate-shaped valve seat 3C, rather than the valve body 2 having a complex shape, and therefore processing costs can be reduced.

[0083] (Mode 2-3) As shown in FIG. 7(c), a step 3s2 is formed at an upper corner of one side (positive side in the Y-axis direction) of the valve seat 3D in a direction perpendicular to the axis L, recessing toward the other side (negative side in the Y-axis direction) in the direction perpendicular to the axis L and extending in the X-axis direction. The side adhesive reservoir 66 is defined between the step 3s2 and the opposing surface of the side guide 2bg that faces the step 3s2, and has a rectangular cross section. Note that, in aspect 2-3 of this embodiment, the side adhesive reservoir 66 is formed at an upper corner of the valve seat 3D, but is not limited thereto. For example, the side adhesive reservoir 66 may be formed on any of the opposing surfaces of the valve seat 3D that face the side guide 2bg.

[0084] The side adhesive reservoir 66 has a width Y3 in the direction perpendicular to the axis L, a height Z6 in the vertical direction, and a depth D6 (not shown) in the direction parallel to the axis L, with a total volume of Y3 × Z6 × D6. The total volume of the side adhesive reservoir 66 is set to be equal to or greater than the amount of adhesive Ad used to secure the valve seat 3D to the fixing surface 2bf. Therefore, even if the adhesive Ad is stored in the side adhesive reservoir 66, the side adhesive reservoir 66 will not be completely filled with adhesive Ad. Furthermore, in the direction perpendicular to the axis L (the Y-axis direction), the side adhesive reservoir 66 has a width Y3 that is greater than the maximum mounting gap G2 between the side guide portion 2bg and the valve seat 3D (Y3 > G2). As a result, as in mode 2-1, even if the adhesive Ad attempts to rise through the gap between the lateral guide portion 2bg and the valve seat portion 3 at a relatively high speed, the speed of the adhesive Ad is suppressed because the lateral adhesive reservoir portion 66 is interposed in its path, and as a result, the adhesive Ad can be stored in a stable state inside the lateral adhesive reservoir portion 66.

[0085] As shown in Figure 7(c), as in Mode 2-1, the upper space of the side adhesive reservoir 66 is connected to the valve chamber 2a, and the adhesive Ad is drawn into the side adhesive reservoir 66 by the surface tension generated in the adhesive Ad. After that, the hardened adhesive Ad having a concave surface is visibly arranged inside the side adhesive reservoir 66. Furthermore, because the side adhesive reservoir 66 is provided above the gap between the side guide portion 2bg and the valve seat 3, the adhesive area between the side guide portion 2bg and the valve seat 3 is relatively large, and therefore the adhesive strength of the valve seat 3 to the valve body 2 can be improved.

[0086] Thus, in Mode 2-3 of the present embodiment, by employing the side adhesive reservoir 66, the same effect as Mode 2-1 of the present embodiment is achieved, that is, the first and second problems of the conventional valve seat (problems arising from the valve seat positioning means and valve seat fixing means) are all eliminated, and the adhesive Ad is caused to flow out of the open side of the side adhesive reservoir 66, more reliably preventing the adhesive Ad from spilling onto the sliding surface 33. Furthermore, Mode 2-3 of the present embodiment also achieves the same effect as Mode 2-2 of the present embodiment, that is, the side adhesive reservoir 66 is formed by processing the plate-shaped valve seat 3D to have a stepped shape, thereby reducing processing costs. Additionally, in Mode 2-3 of the present embodiment, the cured adhesive Ad having a concave surface disposed inside the side adhesive reservoir 66 is visible, more reliably preventing the adhesive Ad from spilling onto the sliding surface 33. Furthermore, in the mode 2-3 of this embodiment, the adhesive area between the side guide portion 2bg and the valve seat portion 3 is relatively large, so that the adhesive strength of the valve seat portion 3 to the valve body 2 can be improved.

[0087] In the above embodiment, for the sake of explanation, in modes 2-1 to 2-3, the side adhesive reservoirs 64 to 66 are formed only on one side (the positive side in the Y-axis direction) of the pair of side guide portions 2bg in a direction perpendicular to the axis L, but this is not limiting, and for example, they may be formed only on the other side (the negative side in the Y-axis direction) of the pair of side guide portions 2bg in a direction perpendicular to the axis L, or they may be formed on both sides. Also, in this embodiment, modes 1-1 to 1-3 and modes 2-1 to 2-3 are provided separately, but this is not limiting, and for example, modes 1-1 to 1-3 and modes 2-1 to 2-3 may be combined as appropriate. In this embodiment, even when Modes 1-1 to 1-3 and Modes 2-1 to 2-3 are combined, the total volume of the combined adhesive reservoirs 61 to 66 is set to be equal to or greater than the application amount of adhesive Ad used to secure the valve seat portions 3, 3A, 3B, 3C, and 3D to the fixing surfaces 2bf, and hardened adhesive Ad having concave surfaces is arranged inside the combined adhesive reservoirs 61 to 66. Furthermore, when Modes 1-1 to 1-3 and Modes 2-1 to 2-3 are combined, it is preferable to combine them so that the one-end adhesive reservoirs 61 to 63 and the side adhesive reservoirs 64 to 66 are easily connected to each other.

[0088] <New problems with the side adhesive reservoir> Next, a new problem that occurs in the side adhesive reservoir 64 will be described with reference to FIG. 7(a).

[0089] First, in general, when an internal pressure is applied to a thin-walled cylindrical pressure vessel, circumferential stress in the circumferential direction and axial stress in the axial direction occur as stresses to withstand the internal pressure. Although a detailed explanation is omitted, this circumferential stress is twice the axial stress. This explanation can also be applied to the valve body 2, which has a substantially cylindrical shape.

[0090] For example, as shown in Figures 6(a) and 7(a), the one-end adhesive reservoir 61 and the side adhesive reservoir 64 each have a corner between them and the fixing surface 2bf. Therefore, when the pressure in the valve chamber 2a increases, axial stress is generated in the corner of the one-end adhesive reservoir 61 in a direction that widens the interior angle, and circumferential stress is generated in the corner C1 of the side adhesive reservoir 64 in a direction that widens the interior angle. As described above, because the circumferential stress is twice as large as the axial stress, a relatively large stress concentration occurs, particularly in the corner C1 of the side adhesive reservoir 64. In some cases, cracks may occur, potentially causing the valve body 2 to break.

[0091] In contrast, in modes 3 and 4 of the first embodiment, by forming corners R at the corners of the side adhesive reservoirs 67, 67', 68, 68', which extend in the direction of the axis L and have an R-shaped cross-sectional shape, stress concentration at the corners can be alleviated and the pressure resistance of the valve bodies 2', 2'', 2''', and 2'''' can be increased, thereby eliminating the new problems with the side adhesive reservoirs.

[0092] Furthermore, the corners of the side adhesive reservoirs 67, 67', 68, 68' are located at positions P1far and P2far (hereinafter referred to as "farthest radius positions") with a radius R0 (hereinafter referred to as "farthest radius") farthest from the axis O of the valve body 2', 2", 2''', 2''" and therefore serve as the starting points for stress concentration. Therefore, by setting the radius of curvature of the corner R at the corners of the side adhesive reservoirs 67, 67', 68, 68' within a predetermined range (0.5T or more and the farthest radius R0 or less), stress concentration can be more reliably alleviated and the pressure resistance of the valve body can be further improved. Here, T represents the thickness of the valve seat. Note that if the radius of curvature at the corners of the side adhesive reservoirs 67, 67', 68, 68' is less than 0.5T, the effect of alleviating stress concentration will be reduced, and therefore it will be necessary to combine it with another curve. Furthermore, if the radius of curvature at the corner of the lateral adhesive reservoir 67, 67', 68, 68' exceeds the furthest radius R0, the corner of the lateral adhesive reservoir 67, 67', 68, 68' will no longer be at the furthest radius position, and it will be necessary to form a corner R at the newly formed furthest radius position.

[0093] Therefore, as specific examples, the radius of curvature of the corner R formed at the farthest radius positions P1far and P2far is broadly divided into Mode 3 (side adhesive reservoirs 67, 67') in which a relatively small value is selected from a predetermined range, and Mode 4 (side adhesive reservoirs 68, 68') in which a relatively large value is selected. Mode 3 of the first embodiment and Mode 4 of the first embodiment will be described below with reference to FIGS. 8 and 9. The dashed dotted lines shown along the valve bodies 2', 2'', 2''', and 2'''' in FIGS. 8 and 9 indicate a circle or arc having the farthest radius R0.

[0094] (Aspect 3 of the first embodiment) 8(b) and 8(c), in Mode 3 of the first embodiment, the radius of curvature of the corner R at the farthest radius position P1far of the side adhesive reservoirs 67, 67' is selected to be a relatively small value (here, the minimum value of 0.5T) within the range of 0.5T or more and the farthest radius R0 or less. Depending on the shape of the side adhesive reservoirs, there are two modes, Mode 3-1 and Mode 3-2.

[0095] (Mode 3-1) 8(a) and 8(b), the corner of the side adhesive reservoir 67 connecting the pair of side guide portions 2bg and the fixing surface 2bf in the direction perpendicular to the axis L is the farthest radial position P1far, which is the starting point of stress concentration. To mitigate this stress concentration, a corner R consisting of a first curve Cu1 with a curvature radius of 0.5T1 is formed at the farthest radial position P1far. Here, T1 represents the plate thickness of the valve seat portion 3'. As a result, the corner R of the side adhesive reservoir 67 has a recessed portion 2br consisting of only one curve (the first curve Cu1).

[0096] Thus, in Mode 3-1 of the present embodiment, by adopting the lateral adhesive reservoir portion 67 having a corner R composed of one curve (only the first curve Cu1), the same effects as those in Mode 2-1 of the present embodiment can be achieved, that is, all of the conventional first and second problems (problems caused by the valve seat positioning means and the valve seat fixing means) can be solved. Further, in Mode 3-1 of the present embodiment, by forming a corner R composed of the first curve Cu1 at the most separated radius position P1far, stress concentration can be reliably alleviated, so that new problems of the lateral adhesive reservoir portion can also be solved. Furthermore, by selecting a relatively small radius of curvature for the radius of curvature R1 of the first curve Cu1, the volume of the lateral adhesive reservoir portion 67 can be appropriately set, and the region of the lateral guide portion 2bg can be secured. In addition, since the corner R in the lateral adhesive reservoir portion 67 can be composed of one curve (only the first curve Cu1), it can be formed relatively easily.

[0097] (Mode 3-2) As shown in FIG. 8(c), at the most separated radius position P1far, since it serves as the starting point of stress concentration as in Mode 3-1, in order to relieve this stress concentration, a corner R composed of the first curve Cu1' having a radius of curvature of 0.5T2 is formed at the most separated radius position P1far. Here, T2 represents the plate thickness of the valve seat portion 3''. Further, in order to expand the region of the lateral guide portion 2bg, on one side (the plus side in the Y-axis direction) of the first curve Cu1', the second curve Cu2 (radius of curvature R2: less than 0.5T2) is continuously and smoothly connected via the connection portion P1, and this second curve Cu2 is connected to the lower end portion of the lateral guide portion 2bg. In FIG. 8(c), the radius of curvature R2 of the second curve Cu2 is set to be 0.3T2, and the plate thickness T2 of the valve seat portion 3'' is a smaller value (T2 < T1) than the plate thickness T1 of the valve seat portion 3'. As a result, the corner R in the lateral adhesive reservoir portion 67' has a recessed portion 2br composed of two curves (the first curve Cu1' and the second curve Cu2).

[0098] In this way, in mode 3-2 of the present embodiment, by employing a side adhesive reservoir 67' having a corner R formed by two curves (first curve Cu1' and second curve Cu2), it is possible to achieve the same effect as mode 3-1 of the present embodiment, that is, it is possible to solve all of the conventional first and second problems (problems caused by the valve seat positioning means and valve seat fixing means) and the new problems of side adhesive reservoirs. Furthermore, in mode 3-2 of the present embodiment, the second curve Cu2 (having a smaller radius of curvature R2 than the first curve Cu1') is continuously and smoothly connected to one side of the first curve Cu1'. Therefore, compared to mode 3-1 of the present embodiment, the height of the side adhesive reservoir 67' is lowered, and the area of ​​the side guide portion 2bg is more reliably secured. In addition, the thickness T2 of the valve seat portion 3'' is made thinner (T2 <T1)させることができる。

[0099] In mode 3-2 of this embodiment, a relatively small value is selected as the radius of curvature R1' of the first curve Cu1'. Specifically, the upper limit of the radius of curvature R1' of the first curve Cu1' is set to be equal to or less than the minimum radius R0 × 1 / 4, thereby ensuring the area of ​​the fixing surface 2bf. Also, in mode 3-2 of this embodiment, two curves (the first curve Cu1' and the second curve Cu2) are connected to form a corner R between the lower end of the side guide portion 2bg and the end of the fixing surface 2bf. However, the number of curves, the radii of curvature, and the combination of curves are not limited to this. For example, the corner R may be formed by connecting one or more curves continuously and smoothly to at least one of the two sides of the first curve Cu1'.

[0100] (Aspect 4 of the first embodiment) As shown in Figures 9(b) and (c), in Mode 4 of the first embodiment, the radius of curvature of the corner R at the farthest radius position P2far of the side adhesive reservoirs 68, 68' is selected to be a relatively large value (here, the maximum farthest radius R0) within the range of 0.5T or more and the farthest radius R0 or less. There are two modes, Mode 4-1 and Mode 4-2, depending on the shape of the side adhesive reservoirs. Mode 4 of the first embodiment differs from Mode 3 of the first embodiment not only in the shape of the side adhesive reservoirs, but also slightly in the shape of the valve seat portion 3''' and the formation area of ​​the pair of side guide portions 2bg.

[0101] First, the valve seat 3''' is made of a plate-like material such as stainless steel with a uniform thickness, and is integrally formed by pressing. It is arranged horizontally (in the XY plane) and includes a rectangular flat plate 3a''' and a pair of reinforcing portions 3b''' rising from both lateral (Y-axis) edges of the flat plate 3a'''. Furthermore, the pair of side guide portions 2bg (see the dotted pattern in Figure 9) of the valve body 2''', 2'''' are formed on the lower side of the inner circumferential wall 2b, and have vertical formation regions at positions opposite the pair of reinforcing portions 3b'''.

[0102] (Mode 4-1) As shown in FIGS. 9(a) and (b), the corner of the side adhesive reservoir portion 68 that connects the pair of side guide portions 2bg and the fixed surface 2bf in the direction orthogonal to the axis L is at the maximum separation radius position P2far, and since it becomes the starting point of stress concentration, in order to relieve this stress concentration, a corner R formed of a first curve Cu1'' having a radius of curvature of the maximum separation radius R0 is formed at the maximum separation radius position P2far. Here, T3 represents the plate thickness of the valve seat portion 3'''. Further, on one side (the plus side in the Y-axis direction) of the first curve Cu1'', a second curve Cu2'' (the radius of curvature R2'' may be any value) is continuously and smoothly connected via the connection portion P2, and this second curve Cu2'' is connected to the lower end portion of the side guide portion 2bg. Furthermore, on the other side (the minus side in the Y-axis direction) of the first curve Cu1'', a third curve Cu3 (the radius of curvature R3: not less than 0.5T3 and not more than 1 / 4 of the maximum separation radius R0) is continuously and smoothly connected via the connection portion P3. The radius of curvature R3 of this third curve Cu3 is set to be smaller than the radius of curvature R1'' of the first curve Cu1'' (R3 < R1''). In FIG. 9(b), the radius of curvature R′′1 of the first curve Cu1′′ is 13T3, the radius of curvature R′′2 of the second curve Cu2′′ is 1.5T3, and the radius of curvature R3 of the third curve Cu3 is 1.0T3. As a result, the corner R in the side adhesive reservoir portion 68 has a recessed portion 2br composed of three curves (the first curve Cu1'', the second curve Cu2'', and the third curve Cu3).

[0103] Thus, in Mode 4-1 of this embodiment, by employing a side adhesive reservoir 68 having a corner radius formed by three curves (first curve Cu1″, second curve Cu2″, and third curve Cu3), it is possible to achieve the same effect as Mode 3-1 of this embodiment, that is, it is possible to solve both the first and second problems of the conventional valve seat (problems caused by the valve seat positioning means and the valve seat fixing means) and the new problems of side adhesive reservoirs. In particular, by setting the radius of curvature R1″ of the first curve Cu1″ to the farthest radius R0 as in Mode 4-1 of this embodiment, the farthest radius position P2far can be expanded to a region along the circumferential direction, that is, the region from which stress concentration originates can be expanded, thereby more effectively dispersing stress concentration. In addition, in Mode 4-1 of this embodiment, the third curve Cu3 (having a radius of curvature R3 smaller than that of the first curve Cu1″) is continuously and smoothly connected to the other side of the first curve Cu1″, thereby reliably securing the area of ​​the fixing surface 2bf.

[0104] In mode 4-1 of this embodiment, three curves (first curve Cu1'', second curve Cu2'', and third curve Cu3) are connected to form a corner R between the lower end of the side guide portion 2bg and the end of the fixing surface 2bf, but the number of curves, radii of curvature, and combination of curves are not limited to this. For example, the corner R may be formed by continuously and smoothly connecting one or more curves on each side of the first curve Cu1''.

[0105] (Mode 4-2) As shown in FIG. 9(c), the farthest radius position P2far is the starting point of stress concentration, as in mode 4-1. Therefore, to alleviate this stress concentration, a corner R consisting of a first curve Cu1″ having a radius of curvature of the farthest radius R0 is formed at the farthest radius position P2far. Also, as in mode 4-1, a second curve Cu2″ (the radius of curvature R2″ may be any value) is continuously and smoothly connected to one side of the first curve Cu1″ via a connecting portion P2, and a third curve Cu3 (the radius of curvature R3: 0.5T3 or more and the farthest radius R0×¼ or less, and the radius of curvature R3<the radius of curvature R1″) is continuously and smoothly connected to the other side of the first curve Cu1″ via a connecting portion P3. Additionally, a vertical wall Vp is formed at the end of the fixing surface 2bf so as to define the boundary of the side adhesive reservoir portion 68′. A fourth curve Cu4 (radius of curvature R4: 0.5T3 or less) is continuously and smoothly connected to the lower end of this vertical wall Vp and the other side of the third curve Cu3 via connection portions P5 and P4. In FIG. 9(b), the radius of curvature R1" of the first curve Cu1" is 13T3, the radius of curvature R2" of the second curve Cu2" is 1.5T3, the radius of curvature R3 of the third curve Cu3 is 1.0T3, and the radius of curvature R4 of the fourth curve Cu4 is 0.3T3. As a result, the corner R of the side adhesive reservoir 68' has a recessed portion 2br composed of four curves (first curve Cu1", second curve Cu2", third curve Cu3, and fourth curve Cu4).

[0106] Thus, in mode 4-2 of the present embodiment, by employing a side adhesive reservoir 68' having corner radii formed by four curves (first curve Cu1'', second curve Cu2'', third curve Cu3, and fourth curve Cu4), it is possible to achieve the same effect as mode 4-1 of the present embodiment, that is, it is possible to solve both the first and second problems of the conventional system (problems caused by the valve seat positioning means and the valve seat fixing means) and the new problems of side adhesive reservoirs. Furthermore, in mode 4-2 of the present embodiment, similar to mode 4-1 of the present embodiment, by setting the radius of curvature R1'' of the first curve Cu1'' to the farthest radius R0, the farthest radius position P2far can be expanded to a region along the circumferential direction, that is, the region that serves as the starting point of stress concentration can be expanded, thereby more effectively dispersing stress concentration. In addition, in aspect 4-2 of this embodiment, the vertical wall Vp defines the boundary of the lateral adhesive reservoir 68', thereby allowing the width of the lateral adhesive reservoir 68' to be appropriately adjusted and the area of ​​the fixing surface 2bf to be more reliably secured.

[0107] In mode 4-2 of this embodiment, four curves (first curve Cu1'', second curve Cu2'', third curve Cu3 and fourth curve Cu4) are connected to form a corner R between the lower end of the side guide portion 2bg and the lower end of the vertical wall Vp, but the number of curves, radii of curvature, combination of curves, etc. are not limited to this. For example, the corner R may be formed by continuously and smoothly connecting one or more curves on each side of the first curve Cu1''.

[0108] As described above, in aspects 3 and 4 of this embodiment, by forming corners R that extend in the axial direction L and have an R-shaped cross section at the corners of the side adhesive reservoirs 67, 67', 68, 68', it is possible to alleviate stress concentration at the corners and suppress the occurrence of breakage of the valve body 2, that is, to increase the pressure resistance of the valve body 2. Furthermore, in aspects 3 and 4 of this embodiment, by setting the radius of curvature of the corners R at the corners of the side adhesive reservoirs 67, 67', 68, 68' to be within a predetermined range (at least 0.5 times the plate thickness of the valve seat and not more than the furthest radius R0), it is possible to more reliably alleviate stress concentration.

[0109] In addition, the corner R in Modes 3 and 4 of this embodiment has a recessed area with respect to at least the fixing surface 2bf so as not to interfere with the opposing portions of the valve seat 3', 3", and 3'"; however, this is not limited to this. For example, as shown in FIG. 7(b), when a cutout portion 3c2 is formed in the lower corner of the valve seat 3C, the corner R may be formed so that the corner of the corner C2 is rounded and continuously and smoothly connected to the fixing surface 2bf and the side guide portion 2bg so as not to interfere with the valve seat 3C.

[0110] (Second embodiment) A slide type switching valve according to the second embodiment will be described using Figures 10 and 11. The slide type switching valve 100 according to the first embodiment is formed with adhesive reservoirs 61-66 to prevent the adhesive Ad from spilling onto the sliding contact surface 33 of the valve seat 3, whereas the slide type switching valve according to the second embodiment is different in that it is formed with adhesive avoidance spaces 71, 72 to avoid the adhesive Ad spilling onto the sliding contact surface 33 of the valve seat 3. The other basic configuration of the second embodiment is the same as that of the first embodiment. Here, the same configurations are given the same symbols, and duplicated explanations will be omitted.

[0111] 10 and 11, the valve disc 4A includes a valve body 40A having a bowl-shaped portion 40b. The bowl-shaped portion 40b includes a protruding portion 40P that protrudes in the direction of the axis L and extends perpendicular to the axis L, and a pair of sliding contact portions 40S that protrude in the direction perpendicular to the axis L and extend in the direction of the axis L. The pair of sliding contact portions 40S have a small gap between them and the pair of side guide portions 2bg so that the valve disc 4A can slide smoothly relative to the valve seat 3. Here, as shown in FIG. 10(c), the protruding amount WP of the protruding portion 40P in the direction of the axis L is set to be larger than the overflow width Wa1 of the adhesive Ad on the sliding contact surface 33 of the valve seat 3 (WP>Wa1). 10(d), in the direction perpendicular to the axis L, the protrusion amount WS of the sliding contact portion 40S is set to be larger than the overflow width Wa2 of the adhesive Ad on the sliding contact surface 33 of the valve seat 3 (WS>Wa2). Furthermore, as shown in FIG. 11(b), a one-side step portion 4As1 and a side step portion 4As2 are formed between the protrusion portion 40P and the opening edge 40a, and between the sliding contact portion 40S and the opening edge 40a, respectively. Here, the overflow widths Wa1 and Wa2 of the adhesive Ad on the sliding contact surface 33 of the valve seat 3 in this embodiment are based on values ​​measured in advance by experiments, and a predetermined margin is added to these values ​​to be on the safe side.

[0112] <About adhesive avoidance space> The adhesive avoidance spaces 71, 72 consist of a one-end adhesive avoidance space 71 and a side adhesive avoidance space 72. Here, as shown in FIG. 10(c), the one-end adhesive avoidance space 71 is defined between the protrusion 40P, the one-side step portion 4As1, the sliding contact surface 33 of the valve seat portion 3, and the one-end guide portion 2cg, and has a rectangular cross section. Similarly, as shown in FIG. 10(d), the side adhesive avoidance space 72 is defined between the sliding contact portion 40S, the side step portion 4As2, the sliding contact surface 33 of the valve seat portion 3, and the side guide portion 2bg, and has a rectangular cross section. Note that in this embodiment, the total volume of the one-end adhesive avoidance space 71 and the side adhesive avoidance space 72 is set to be equal to or greater than the amount of adhesive Ad applied to fix the valve seat portion 3 to the fixing surface 2bf.

[0113] 10(c), when the valve body 4A moves in the movement direction M1, the protrusion 40P comes into contact with the one-end guide portion 2cg (see FIG. 3(c)) via the contact area Ca. At this time, because the protrusion amount WP of the protrusion 40P, i.e., the one-end adhesive avoidance space 71, is set to be larger than the protrusion width Wa1 of the adhesive Ad on the sliding contact surface 33 of the valve seat 3 (WP>Wa1), the adhesive Ad that has protruded onto the sliding contact surface 33 is reliably contained inside the one-end adhesive avoidance space 71, and the opening edge 40a of the valve body 4A does not interfere with the adhesive Ad.

[0114] 10(d), when the valve body 4A moves in the movement direction M2, the sliding contact portion 40S comes into contact with the side guide portion 2bg via the contact area Ca. At this time, because the protrusion amount WS of the sliding contact portion 40S, i.e., the side adhesive avoidance space 72, is set to be larger than the protrusion width Wa2 of the adhesive Ad on the sliding contact surface 33 of the valve seat 3 (WS>Wa2), the adhesive Ad that has protruded onto the sliding contact surface 33 is reliably contained inside the side adhesive avoidance space 72, and the opening edge portion 40a of the valve body 4A does not interfere with the adhesive Ad.

[0115] In this way, in this embodiment, instead of welding, the one end guide portion 2cg, the side guide portion 2bg, and adhesive fixing are used as the fixing means for the valve seat portion 3, which makes it possible to solve the first and second problems (problems caused by the positioning means for the valve seat portion and the fixing means for the valve seat portion).In addition, by adopting adhesive avoidance spaces 71, 72, the valve body 4A reliably avoids the adhesive Ad that protrudes from the adhesive surface 34 of the valve seat portion 3 onto the sliding surface 33, so that a new problem with the fixing means (adhesive fixing) for the valve seat portion can also be solved.

[0116] As described above, in this embodiment, by employing the adhesive avoidance spaces 71, 72, it is possible to solve all of the first and second problems of the conventional art (problems caused by the positioning means for the valve seat portion and the fixing means for the valve seat portion).

[0117] Although the adhesive reservoir sections 61-66 in the first embodiment and the adhesive avoidance spaces 71, 72 in the second embodiment have been described as being provided separately, this is not limited to this. By combining the adhesive reservoir sections 61-66 in the first embodiment with the adhesive avoidance spaces 71, 72 in the second embodiment, even if the adhesive Ad overflows from the adhesive surface 34 of the valve seat section 3 onto the sliding surface 33 despite the provision of the adhesive reservoir sections 61-66, the adhesive avoidance spaces 71, 72 will function as a fail-safe, so the opening edge section 40a of the valve body 4A will not interfere with the adhesive Ad.

[0118] <Other> It goes without saying that the slide type switching valve 100 of this embodiment can be applied not only to the refrigeration cycle system illustrated, but also to any fluid device and fluid circuit. Furthermore, the present invention is not limited to the above-described aspects, embodiments, and modified examples, and can be appropriately changed or modified within the scope of the technical concept of the present invention. [Explanation of symbols]

[0119] 100 Slide type switching valve 1. Housing 1a Insertion port 1c Pathway 2 1d Entrance route 1e 1st pathway 1s Exit Route 1C C fitting pipe 1D D joint pipe 1E E joint pipe 1S S joint pipe 2, 2', 2'', 2''', 2'''', 2A, 2B valve body 2a Valve chamber (inside the valve body) 2b Inner wall 2bf fixed surface 2bg Side guide part (guide part) 2br recess 2c One end side wall 2cg One end guide part (guide part) 2cr recess 2d Other end opening 20 inlet port 21 First connecting channel 22 Outlet connection channel 23 Second connecting channel 24 Lower lid 25 Top lid 25a Small diameter section 25b Large diameter part 26 O-ring 27 Retaining ring 3,3',3'',3''',3A,3B,3C,3D, valve seat part 3a''' Flat plate part 3b''' Pair of reinforcements 3c1, 3c2 Notch 3s1,3s2 Stepped section 30 Port 1 31 Exit Port 32 Second Port 33 Sliding surface 34 Adhesive surface 4,4A Valve body 4As1 One side step 4As2 Side step 40,40A Valve body 40a opening edge 40b Bowl-shaped portion (outer surface of valve body) 40c bowl-shaped recess 40P protrusion 40S sliding contact part 42 Spring member 44 Connecting part 45 Fastening band 5 Drive unit 5a stepper motor 5b Linear motion mechanism 50 Can 51 Magnet rotor 52 stator coil 53 Bearing materials 53a First bearing hole 54 Partition wall member 54a Second bearing hole 54b Pair of bulkhead holes 54d Partition wall 55 Male threaded member 55a Fixing member 55d male thread 56 Female thread member 56a Threaded cylinder 56a1 female thread 56b Pair of connecting arms 59 Shaft material 61 to 63 One end adhesive reservoir (adhesive reservoir) 64~68,67',68' Side adhesive reservoir (adhesive reservoir) 71 One end adhesive avoidance space (adhesive avoidance space) 72 Lateral adhesive avoidance space (adhesive avoidance space) 200 Compressor 300 Outdoor heat exchanger 400 Indoor heat exchanger 500 aperture device A,B Adhesive movement direction C1,C2 corner Ca contact area Cu1,Cu1',Cu1'' 1st curve Cu2,Cu2'' 2nd curve Cu3 third curve Cu4 4th curve G groove G1 Installation gap between one end guide and valve seat G2 Maximum installation clearance between the side guide and the valve seat L axis M Insertion direction M1 movement direction M2 Moving direction O axis center P1, P2, P3, P4, P5 connection parts P1far,P2far Farthest radius position R0 furthest radius s Seal part Sa threaded area Ss screw storage space T1, T2, T3 Valve seat thickness Vp vertical wall Wa1: Width of adhesive overflow on the sliding surface in the axial direction Wa2: Width of adhesive overflowing from the sliding surface in the direction perpendicular to the axis WP Protrusion amount WS Protrusion of sliding contact part

Claims

1. a hollow cylindrical valve body extending along an axial direction; a valve element provided inside the valve body so as to be slidable along the axial direction; a plate-shaped valve seat portion fixed to a fixing surface of the valve body and with which the valve element slides; A slide type switching valve comprising: the valve seat portion has a plurality of valve ports arranged in the axial direction, a sliding contact surface with which the valve body slides, and an adhesive surface located on the opposite side of the sliding contact surface, a guide portion that stands vertically from the fixing surface and is capable of contacting the valve seat portion is provided on one end side in the axial direction of the fixing surface of the valve body and at least one of a pair of sides in a direction perpendicular to the axis, the valve seat portion is positioned by the guide portion, and the adhesive surface is adhesively fixed to the fixing surface; A slide-type switching valve characterized in that an adhesive reservoir portion is formed on at least one of the opposing surfaces of the guide portion and the valve seat portion to prevent adhesive from spilling out from the adhesive surface onto the sliding contact surface.

2. 2. The slide-type switching valve according to claim 1, wherein a total volume of the adhesive reservoir is equal to or greater than an amount of adhesive to be applied to fix the valve seat to the fixing surface.

3. In the direction perpendicular to the axis, 3. The slide-type switching valve according to claim 2, wherein the adhesive reservoir formed on at least one of the opposing surfaces of the guide portion and the valve seat portion has a width greater than a maximum mounting gap between the guide portion and the valve seat portion, and a hardened adhesive having a concave surface is disposed inside the adhesive reservoir portion.

4. In the axial direction, 3. The slide-type switching valve according to claim 2, wherein the adhesive reservoir formed on the opposing adhesive surfaces of at least one of the guide portion and the valve seat portion has a width greater than an attachment gap between the guide portion and the valve seat portion, and a hardened adhesive having a concave surface is disposed inside the adhesive reservoir portion.

5. The guide portion is provided on one end side in the axial direction and on both sides of a pair of lateral sides in a direction perpendicular to the axis, 4. The slide-type switching valve according to claim 3, wherein a corner R extending along the axial direction is provided at a corner of an adhesive reservoir portion connecting the fixing surface and the guide portion provided on both sides of the pair of sides.

6. 6. The slide-type switching valve according to claim 5, wherein the radius of curvature of the corner R at a position of the adhesive reservoir portion having the greatest radius farthest from the axis of the valve body is 0.5 times or more the thickness of the valve seat portion and is not more than the greatest radius.

7. 7. The slide-type switching valve according to claim 6, wherein the radius of curvature of the corner R at a position having the maximum radius farthest from the axis is the maximum radius.

8. 7. The slide-type switching valve according to claim 6, wherein the corner R has at least a region recessed with respect to the fixed surface.

9. a hollow cylindrical valve body extending along an axial direction; a valve element provided inside the valve body so as to be slidable along the axial direction; a plate-shaped valve seat portion fixed to a fixing surface of the valve body and with which the valve element slides; A slide type switching valve comprising: the valve seat portion has a plurality of valve ports arranged in the axial direction, a sliding contact surface with which the valve body slides, and an adhesive surface located on the opposite side of the sliding contact surface, a guide portion that stands vertically from the fixing surface and is capable of contacting the valve seat portion is provided on one end side in the axial direction of the fixing surface of the valve body and at least one of a pair of sides in a direction perpendicular to the axis, the valve seat portion is positioned by the guide portion, and the adhesive surface is adhesively fixed to the fixing surface; A slide-type switching valve characterized in that an adhesive avoidance space is formed on the outer peripheral surface of the valve body facing the guide portion so that adhesive that overflows from the adhesive surface onto the sliding surface does not interfere with the valve body.

10. In the direction perpendicular to the axis, 10. The slide-type switching valve according to claim 9, wherein the adhesive avoidance space formed on the outer peripheral surface of the valve body facing the guide portion is larger than the width of the adhesive overflowing from the sliding contact surface, protrudes from the valve body, and is formed by a sliding contact portion that slides against the guide portion.

11. In the axial direction, 10. The slide-type switching valve according to claim 9, wherein the adhesive avoidance space formed on the outer peripheral surface of the valve body facing the guide portion is larger than the width of the adhesive overflowing from the sliding contact surface, and is formed by a protruding portion that protrudes from the valve body and abuts against the guide portion.

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