Valve device

Abstract

The invention provides a valve device which can improve corrosion resistance, eliminate existing problem points (external leakage caused by electrochemical corrosion) and improve sealing performance by adopting an electrochemical corrosion prevention unit. A valve device (100a) housed in a housing (H) made of a metal material is provided with: a valve body (20) having a shaft seal part; a housing (71) fixed to the valve body (20) and defining a housing space (3); and an electrochemical corrosion prevention unit. The electrochemical corrosion prevention means seals the housing space (3) from the external environment by sandwiching the shaft seal member (O1) between a shaft seal member housing groove (27a) formed in the shaft seal section and a ring-shaped surface (G1) formed in the housing (H), the shaft seal member housing groove (27a) being formed from a resin material and disposed so as to face each other in the radial direction.

Description

Technical Field

[0001] The present invention relates to a valve device provided with an electrochemical corrosion prevention unit. Background Art

[0002] In the valve device, when it is fixed to a housing or the like, a shaft seal type in which a radial clearance is managed is adopted and flange connection is performed.

[0003] For example, in Patent Document 1, Fig.12 As shown, a valve device 1200 (hereinafter referred to as "conventional valve device") is described, which includes: a guide body 1220, which is made of a metal material; a plunger 1240, which can move in the guide body 1220; a valve core 1250, which is fixed to the front end of the plunger 1240; and a drive unit 1270, which drives the plunger 1240 in the axial direction. In addition, the valve device 1200 in Patent Document 1 is a shaft seal type in which the radial gap is managed, and further includes: a shaft seal component O12, which is accommodated in a sealing frame 1215 made of a metal material provided on the outer peripheral portion of the lower end of the guide body 1220; and a flange portion 1212, which is fixed to the outer peripheral portion of the guide body 1220 and is made of a metal material. In order to attach the valve device 1200 to the valve housing unit H12 in a sealed state, the flange portion 1212 is flange-coupled to the valve seat member 1230 via the fastening screws 1212f while clamping the shaft seal member O12 in the radial direction.

[0004] Among them, the valve device is installed in, for example, the engine room or motor room of a car in an environment where it is not exposed to moisture, but for some reason, liquids such as water may penetrate into it. Therefore, in order to improve corrosion resistance and versatility, it is desired to improve pressure resistance (be able to withstand relatively high pressure, for example, operating conditions of about 3MPa).

[0005] Among them, the existing valve device is a shaft seal type, so if liquid such as water penetrates from the external environment through the gap between the flange part 1212 and the valve seat part 1230, or if condensation water is generated on the outside of the guide body 1220 cooled by the low-temperature internal fluid and penetrates, the penetrated liquid will accumulate on the upper part of the shaft seal part O12. When the flange part 1212, the sealing frame part 1215 and the valve seat part 1230 are made of different metals and are placed in a contact state in an environment where electricity such as water easily flows, there is a possibility that the corrosion rate of the metal with a greater ionization tendency increases, that is, dissimilar metal contact corrosion (hereinafter referred to as "electrochemical corrosion") may occur. Therefore, in the existing valve device, when the surface of the sealing portion of the sealing frame portion 1215 or the valve seat portion 1230 that the shaft sealing component O12 contacts becomes rough due to the electrochemical corrosion, if a relatively high pressure fluid is introduced, leakage to the external environment may occur through the rough sealing portion (hereinafter referred to as "existing problem point (external leakage caused by electrochemical corrosion)").

[0006] Prior art literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2014-169795 Summary of the invention

[0008] An object of the present invention is to provide a valve device which, by adopting an electrochemical corrosion prevention unit, can improve corrosion resistance, eliminate existing problems (external leakage caused by electrochemical corrosion), and achieve improved sealing performance.

[0009] In order to solve the above-mentioned problems, a valve device is housed in a shell formed of a metal material, and comprises: a valve body having a shaft sealing portion; a shell fixed to the valve body and defining a storage space; and an electrochemical corrosion prevention unit, wherein the electrochemical corrosion prevention unit is formed by forming the valve body with a resin material, and clamping the shaft sealing portion between a shaft sealing portion storage groove which is arranged opposite to each other in the radial direction and formed on one side of the shaft sealing portion and the shell, and an annular surface formed on the other side of the shaft sealing portion and the shell, thereby sealing the storage space from the external environment.

[0010] In addition, the above-mentioned valve device may also include: a fixed metal part, which has a circular ring-shaped flange portion, and the inner circumferential side of the flange portion is embedded and molded in the valve body; and a shaft sealing portion reinforcement unit, which reinforces the shaft sealing portion, and the shaft sealing portion reinforcement unit fixes the outer shell on the other end face of the flange portion, and the shaft sealing portion is arranged adjacent to one end face on the inner circumferential side of the flange portion.

[0011] In addition, in the above-mentioned valve device, the shaft sealing portion reinforcement unit may have a cylindrical portion extending toward one end side in the axial direction and continuously formed on the inner circumferential side of the flange portion, and the shaft sealing portion is arranged adjacent to the outer circumferential side of the cylindrical portion which is insert-molded in the valve body.

[0012] Furthermore, in the above valve device, the shaft seal portion reinforcing means may fix a valve seat member to one end of the cylindrical portion.

[0013] In addition, in the above-mentioned valve device, when viewed from the axial direction, the shaft sealing portion reinforcement unit provides a circular step portion on the flange portion adjacent to the outer peripheral side of the shaft sealing portion, and with the step portion as the boundary, the inner peripheral side of the flange portion is offset toward the other end side compared to the outer peripheral side.

[0014] Furthermore, in the above valve device, the shaft seal portion reinforcing means may be provided with at least one through hole in a region of the cylindrical portion buried in the valve body.

[0015] Furthermore, in the above valve device, the shaft seal portion reinforcing means may be provided with a concave-convex portion in at least a portion of a region where the cylindrical portion and the flange portion are buried in the valve body.

[0016] Furthermore, in the above valve device, the resin material may be PPS to which glass fiber or carbon fiber is added as a reinforcing agent.

[0017] Furthermore, in the above valve device, the shaft seal portion reinforcing means may include a fixing plate that sandwiches the flange portion between the fixing plate and the housing.

[0018] Furthermore, in the above valve device, the fixing plate may include a bracket fixing mechanism for the coil.

[0019] Furthermore, in the above valve device, the electrochemical corrosion preventing means may be configured by disposing an anti-corrosion member for preventing electrochemical corrosion between the fixing plate and the housing and the flange portion.

[0020] Furthermore, in the above valve device, the electrochemical corrosion preventing means may be provided with a surface anti-corrosion treatment portion for preventing electrochemical corrosion on at least a surface of the fixing plate facing the housing and the flange portion.

[0021] The effects of the present invention are as follows.

[0022] According to the present invention, it is possible to provide a valve device which can improve corrosion resistance by adopting an electrochemical corrosion prevention unit, solve the conventional problem (external leakage due to electrochemical corrosion), and achieve improved sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view showing a valve device according to a first embodiment of the present invention.

[0024] Figure 2 It means that Figure 1 The valve device is shown in a cross-sectional view in a state where it is mounted on a housing.

[0025] Figure 3 express Figure 2 An enlarged view of the III-III section is shown.

[0026] Figure 4 express Figure 2 The valve device is shown in a front view in the installed state.

[0027] Figure 5 Explanatory diagram showing a modified example of the shaft seal portion of the first embodiment.

[0028] Figure 6 A cross-sectional view showing a valve device according to a second embodiment of the present invention.

[0029] Figure 7 is used for Figure 6 An illustration of a fixing plate of a valve device, wherein (a) is a top view and (b) is a front view.

[0030] Figure 8 It means that Figure 6 The valve device is shown in a cross-sectional view in a state where it is mounted on a housing.

[0031] Fig. 9 express Figure 8 An enlarged view of the IX-IX section is shown.

[0032] Fig.10 express Figure 8 The valve device is shown in a front view in the installed state.

[0033] Fig.11 It is a cross-sectional view showing a valve device according to a third embodiment.

[0034] Fig.12 It is a cross-sectional view showing a valve device and a valve housing unit before installation according to the prior art.

[0035] In the figure: 100a, 100b, 100c, 100d—valve device, 1a—valve port, 1b—side port, 2—valve chamber, 3—storage space, 10, 10c—fixing metal part, 11—cylindrical part, 12, 12c—flange part, 12a—opening part, 12b—a pair of mounting holes, 12s—stepped part, 12s1—other end side step part, 12s2—one end side step part, 12e—through hole, 12f—a pair of fastening screws, 12g—fastening washer, 13—fixing plate, 13a—through hole, 13b—a pair of mounting holes, 13c—wire Threaded hole for ring bracket (bracket fixing mechanism), 13D—one end side abutment surface, 14—corrosion-resistant component, 20, 20B—guide body (valve body), 23—threaded hole, 23a—internal thread portion, 24—bearing hole, 25—sliding hole, 26—guide rail, 27, 27B—insertion cylinder, 27a—insertion cylinder annular groove (shaft seal component storage groove, shaft seal portion), 27b—insertion cylinder annular surface (shaft seal portion), 30, 30B—valve seat component, 31—boss portion, 32—valve seat component annular groove, 33, 33B—outer peripheral surface, 40—drive shaft , 41—threaded portion, 41a—external threaded portion, 42—guide portion, 43—flange portion, 50—valve core portion, 51—valve bracket, 51a—one end portion, 51b—the other end portion, 52—valve core, 53—gasket, 54—spring seat, 55—compression coil spring, 60—coil component, 61—coil portion, 62—claw portion, 70, 70C—stepping motor, 71, 71C—housing, 72—magnetic rotor, 73, 73C—stator coil, 73a, 73Ca—coil bracket, 73b, 73Cb—fastening screw, 74—magnet portion, 75— Disc portion, 76—metal part, 77—projection, Fb—fastening bolt, Fp1—first flow path, G1—first receiving groove, Gs1—first sealing component receiving groove (shaft sealing component receiving groove), Gs2—second sealing component receiving groove, G2—second receiving groove, Gf—flange portion receiving groove, H, HB, HC—housing, H1—upper surface, L—axis line, O1—first shaft sealing component (shaft sealing component), O2—second shaft sealing component, Pf—sealing joint, Pl1—first piping, Sh—a pair of threaded holes, W1—welding portion, W2—welding portion. DETAILED DESCRIPTION

[0036] Reference Figures 1 to 11 The embodiment of the present invention is described in detail. However, the present invention is not limited to the embodiment. The valve device is described below, but the electrochemical corrosion prevention unit and the shaft seal reinforcement unit in the valve device of the present invention can be applied to an electric valve, a mechanical expansion valve, a mechanical pressure regulating valve, a manual on-off valve, and a solenoid valve.

[0037] <About Terminology>

[0038] In the description of the scope of this specification and the technical solution, "left", "right", "upper" and "lower" mean Figure 1-2 , Figures 4 to 6 , Figure 7 (b) Figure 8 , Figure 10-11 In the description of the scope of the present specification and the technical solution, "one end" and "the other end" mean the "lower end" and "upper end" in the accompanying drawings. In the description of the scope of the present specification and the technical solution, "electrochemical corrosion prevention unit" means "unit for preventing electrochemical corrosion". In the description of the scope of the present specification and the technical solution, "shaft sealing part reinforcement unit" means "unit for reinforcing the shaft sealing part". In addition, in the description of the scope of the present specification and the technical solution, "guide body" means a structure having a guide part for guiding a component that moves in an axial direction (for example, a drive shaft, a valve core part, etc.). Moreover, in the description of the scope of the present specification and the technical solution, "valve body" constitutes at least a part of the outline of the valve device, indicating a structure including a guide body.

[0039] (First Embodiment)

[0040] <About the structure of the valve device>

[0041] use Figure 1 A valve device 100a according to a first embodiment of the present invention will be described. The valve device 100a is mainly composed of a fixing metal member 10, a guide body 20 (valve body), a valve seat member 30, a drive shaft 40, a valve core 50, a coil member 60, and a stepping motor 70. The following will describe the respective structures of the valve device 100a and the housing H (see FIG. 1 ) to which the valve device 100a is mounted. Figure 2 ). Although the details will be described later, the valve device 100a of the first embodiment can improve the corrosion resistance by adopting the electrochemical corrosion prevention unit (1) (shaft sealing portion composed of resin material), thereby eliminating the existing problem (external leakage caused by electrochemical corrosion) and improving the sealing performance.

[0042] The fixing member 10 includes a cylindrical portion 11 which is made of a metal material such as stainless steel and extends in the direction of the axis L and has a cylindrical shape, and a flange portion 12 which is formed continuously with the cylindrical portion 11. An opening 12a which defines a side opening 1b is formed on the side wall of the cylindrical portion 11. Figure 3As shown in the figure, when viewed from the axis L, the flange portion 12 has a shape of approximately three circular ring shapes connected in parallel in the length direction, and a pair of mounting holes 12b are provided in the center of the circular ring shapes on both end sides. A pair of fastening screws 12f are inserted into the pair of mounting holes 12b via fastening washers 12g. Before the stator coil 73 is fixedly arranged on the outer peripheral surface of the housing 71, the pair of fastening screws 12f are inserted into the fastening washers 12g and the pair of mounting holes 12b.

[0043] like Figure 2 As shown in FIG. 1 , as an action of mounting the valve device 100a on the housing H, the pair of fastening screws 12f are screwed into the pair of threaded holes Sh formed on the upper surface H1 of the housing H, while the valve device 100a is moved toward one end side in the direction of the axis L until the outer peripheral portion of one end side of the flange portion 12 abuts against the upper surface H1 of the housing H, which will be described in detail later. As a result, the first shaft seal member O1 (shaft seal member) is clamped between the first receiving groove G1 and the insertion cylinder annular groove 27a (shaft seal member receiving groove, shaft seal portion), and the radial gap between the valve device 100a and the housing H is sealed.

[0044] The guide body 20 has a substantially cylindrical shape and is made of a resin material such as polyphenylene sulfide (PPS), and the fixing member 10 is integrally insert-molded at one end of the guide body 20 .

[0045] The guide body 20 is arranged in such a manner that its axis overlaps with the axis L. In the center of the guide body 20, a threaded hole 23, a bearing hole 24, and a sliding hole 25 are formed on concentric circles so as to penetrate the guide body 20 and be arranged in the direction of the axis L. An internal threaded portion 23a is formed on the inner circumferential surface of the threaded hole 23, and is screwed with an external threaded portion 41a of the drive shaft 40 described later. The guide portion 42 of the drive shaft 40 described later is slidably engaged with the inner circumferential surface of the bearing hole 24. The sliding hole 25 is arranged on one end side and is formed to have a larger diameter than the bearing hole 24. The valve core portion 50 described later is slidably engaged with the sliding hole 25.

[0046] A guide rail 26 composed of spiral ridges is integrally formed on the outer peripheral surface of the other end side of the guide body 20. The adjacent winding parts of the guide rail 26 are arranged at intervals. The guide rail 26 is arranged in a manner that its axis overlaps the axis L, and is screwed with the coil part 61 of the coil component 60 described later, so that the coil component 60 can rotate in the circumferential direction. Guide each winding part of the coil part 61 from one side or both sides.

[0047] In addition, a first receiving groove G1 (see FIG. 1 ) which can be inserted into the insertion hole extending in the axis L direction of the housing H is integrally formed at one end of the guide body 20. Figure 2) is an insertion tube 27. The insertion tube 27 is formed into a cylindrical shape having an outer diameter substantially the same as the inner diameter of the first receiving groove G1. In addition, the insertion tube 27 is formed with an insertion tube annular groove 27a for receiving the shaft seal member O1.

[0048] The valve seat member 30 is made of a metal material such as stainless steel, and includes a boss portion 31, a valve seat member annular groove 32 for accommodating the second shaft seal member O2, and an outer peripheral surface 33 provided between the boss portion 31 and the valve seat member annular groove 32. In addition, a valve port 1a is opened in the center of the valve seat member 30. The boss portion 31 is formed to have an outer diameter smaller than the outer peripheral surface 33, and after being fitted with the cylindrical portion 11 of the fixing metal member 10, the valve seat member 30 is joined to the fixing metal member 10 via a welding portion W2 based on arc welding or the like. As a result, the valve chamber 2 is defined inside the cylindrical portion 11.

[0049] The drive shaft 40 is formed into a cylindrical rod shape using a metal such as stainless steel as a material. The drive shaft 40 is formed with a threaded portion 41, a guide portion 42, and a flange portion 43 arranged at one end of the guide portion 42, which are arranged along the axis L direction. An external threaded portion 41a is formed on the threaded portion 41, and the external threaded portion 41a is screwed with the internal threaded portion 23a of the guide body 20, thereby converting the rotational motion of the drive shaft 40 into a linear motion. The guide portion 42 guides the movement of the drive shaft 40 in the direction of the axis L by slidably engaging with the inner circumferential surface of the bearing hole 24. The drive shaft 40 moves in the direction of the axis L by the thread feed action generated by the rotation. The flange portion 43 rotatably locks the valve core portion 50 described later. In addition, in the first embodiment, the internal threaded portion 23a and the external threaded portion 41a are right-handed threads.

[0050] The valve body portion 50 includes a valve holder 51 , a valve body 52 , a gasket 53 , a spring seat 54 , and a compression coil spring 55 .

[0051] The valve holder 51 is formed in a cylindrical shape having an outer diameter substantially equal to the inner diameter of the sliding hole 25 of the guide body 20. The valve holder 51 is engaged along the sliding hole 25 so as to be slidable in the axis L direction.

[0052] The valve core 52 has a truncated cone shape at one end, and is fixedly mounted to one end 51a of the valve bracket 51 in such a manner that the front end of the truncated cone is opposite to the valve port 1a. The valve core 52 adjusts the flow rate by increasing or decreasing the opening of the valve port 1a and the valve seat from the maximum opening of the valve to the minimum opening of the valve (or the fully closed state).

[0053] The flange portion 43 of the drive shaft 40 is rotatably engaged with the other end portion 51b of the valve holder 51. Specifically, a gasket 53 is inserted between the flange portion 43 of the drive shaft 40 and the other end portion 51b of the valve holder 51, and the other end portion 51b of the valve holder 51 is rotatably engaged with the drive shaft 40 through the flange portion 43. Through this engagement, the valve holder 51 is movable in the direction of the axis L and supported by the drive shaft 40 so as to be rotatable around the axis L. In addition, an opening portion having a larger radial movable range than the drive shaft 40 is formed at the other end portion 51b of the valve holder 51. In addition, a spring seat 54 is movably provided in the direction of the axis L in the valve holder 51. A compression coil spring 55 is installed between the spring seat 54 and the valve core 52 in a compressed state with a predetermined load applied thereto. As a result, the spring seat 54 is pressed toward the other end side and abuts against the gasket 53 and one end portion of the drive shaft 40.

[0054] The coil component 60 integrally includes a coil portion 61 in the shape of a spiral spring and a claw portion 62 protruding radially outward from one end of the coil portion 61. The coil portion 61 is screwed to the guide rail 26 of the guide body 20 so as to be rotatable in the circumferential direction. The coil component 60 can be easily manufactured by molding a metal wire such as stainless steel.

[0055] The stepping motor 70 includes a housing 71 , a magnetic rotor 72 , and a stator coil 73 .

[0056] The housing 71 is made of a metal material such as stainless steel, and has a generally bottomed cylindrical shape with the upper end blocked. The opening end of the housing 71 is airtightly joined to the inner circumference of the flange 12 of the fixing metal member 10 via a weld W1 based on arc welding or the like, thereby defining the storage space 3.

[0057] The magnetic rotor 72 integrally includes a cylindrical magnet portion 74 whose outer circumference is multi-polarly magnetized, a disk portion 75 that blocks the other end thereof, and a protrusion 77. The magnetic rotor 72 is fixedly mounted on the drive shaft 40 via a metal fitting 76 that is molded into the center of the disk portion 75. Thus, the magnetic rotor 72 is rotatably disposed in the housing 71 around the axis L of the drive shaft 40. Among them, the protrusion 77 of the magnetic rotor 72 can abut against the claw portion 62 of the coil component 60. Therefore, by the rotation of the magnetic rotor 72, the coil component 60 is pressed and rotated in the circumferential direction via the claw portion 62. As a result, the coil component 60 abuts against the upper limit stopper (not shown) or the lower limit stopper (not shown), the rotation of the coil component 60 is restricted, and the rotation of the magnetic rotor 72 is also restricted. Therefore, the valve core portion 50 is restricted from moving beyond the position of the maximum opening or the position of the minimum opening (or the closed valve state).

[0058] The stator coil 73 is fixedly disposed on the outer peripheral surface of the housing 71 , and when a pulse signal is applied to the stator coil 73 , the magnetic rotor 72 is rotated according to the number of pulses.

[0059] When the magnetic rotor 72 rotates, the drive shaft 40 rotates together with the magnetic rotor 72, and the drive shaft 40 moves along the axis L direction due to the thread feeding action based on the external thread portion 41a and the internal thread portion 23a, and the valve core portion 50 moves forward and backward relative to the valve port 1a. As a result, the opening of the valve port 1a and the valve seat changes, and the flow rate of the fluid flowing from the valve port 1a to the side port 1b (or from the side port 1b to the valve port 1a) is controlled.

[0060] use Figure 2 as well as Figure 3 The shape of the housing H will be described. Figure 3 yes Figure 2 In the enlarged view of the III-III cross section shown, the valve core portion 50 is omitted for the sake of convenience of explanation.

[0061] The housing H is made of metal materials such as aluminum. Figure 2 As shown, a through hole having a plurality of annular step portions that are successively reduced in diameter from the other end side to the one end side is formed along the axis L. A first receiving groove G1 and a second receiving groove G2 are successively formed in the plurality of annular step portions. Figure 2 The first flow path Fp1 is connected to the front side of the paper, and the first receiving groove G1 is formed with a side ( Figure 2 The valve body 52 of the second flow path (not shown) is connected to the valve body 52 of the paper. In addition, a pair of threaded holes Sh are formed at symmetrical positions on the upper surface H1 of the housing H across the first housing groove G1.

[0062] Furthermore, in the first embodiment, Figure 2 as well as Figure 3 Although the shape of the housing H shown in the figure has been described, this is only an example, and the housing H may have any shape as long as it has an insertion hole and an outer shape that allows the valve device 100a to be inserted into the insertion hole.

[0063] <About the installation action of the valve device>

[0064] use Figure 2 as well as Figure 4 , the installation operation of the valve device 100a to the housing H is described. First, Figure 2As shown, the valve device 100a is inserted from the first receiving groove G1 along the axis L direction of the housing H. Then, the pair of fastening screws 12f are screwed into the pair of threaded holes Sh while being moved toward one end side in the axis L direction until the outer peripheral portion of one end side of the flange portion 12 abuts against the upper surface H1 of the housing H. At this time, the second shaft seal member O2 is clamped between the second receiving groove G2 and the valve seat member annular groove 32 of the valve seat member 30, the first receiving groove G1 and the second receiving groove G2 are sealed, and the first shaft seal member O1 is clamped between the first receiving groove G1 and the insertion tube annular groove 27a, and the first receiving groove G1 and the external environment are sealed.

[0065] Then, if Figure 4 As shown, the stator coil 73 is fixed to the housing H by screwing the fastening screw 73b into the mounting hole (not shown) of the coil bracket 73a made of metal material and the threaded hole (not shown) formed in the side wall of the housing H. In the mounted state of the valve device 100a, the valve port 1a defined by the valve seat member 30 is communicated with the first pipe Pl1 via the first flow path Fp1 and the sealing joint Pf fixed to the housing H by the fastening bolt Fb, and on the other hand, the side port 1b defined by the opening portion 12a of the cylindrical portion 11 is communicated with the second pipe (not shown) via the second flow path.

[0066] <About the existing problem (external leakage caused by electrochemical corrosion)>

[0067] As mentioned above, in Fig.12 In the conventional valve device shown, if liquid such as water infiltrates from the external environment through the gap between the flange portion 1212 and the valve seat member 1230, or if condensation water is generated on the outside of the guide body 1220 cooled by the low-temperature internal fluid and intrudes, the infiltrated liquid accumulates on the upper part of the shaft seal member O12. In the case where the flange portion 1212, the sealing frame portion 1215, and the valve seat member 1230 are made of different metals and are placed in a contact state in an environment where electricity such as water easily flows, electrochemical corrosion may occur. Therefore, in the conventional valve device, in the case where the surface of the sealing portion of the sealing frame portion 1215 or the valve seat member 1230 that the shaft seal member O12 contacts becomes rough due to the electrochemical corrosion, if a relatively high pressure fluid is introduced, there is the existing problem (external leakage caused by electrochemical corrosion), so the sealing performance may be reduced.

[0068] In contrast, the valve device 100a of the first embodiment is housed in a housing H made of a metal material such as aluminum. Therefore, by adopting an electrochemical corrosion prevention unit (1) (a shaft sealing portion made of a resin material), it is possible to improve corrosion resistance, eliminate existing problems (external leakage caused by electrochemical corrosion), and achieve improved sealing.

[0069] <Electrochemical Corrosion Prevention Unit (1) (Shaft Seal Made of Resin Material)>

[0070] The electrochemical corrosion prevention unit (1) (a shaft sealing portion made of resin material) forms a guide body 20 made of resin material, and clamps the first shaft sealing component O1 between the annular groove 27a of the insertion tube 27 of the guide body 20 and the annular surface of the first receiving groove G1 of the shell H arranged opposite to each other in the radial direction, thereby sealing the receiving space 3 from the external environment.

[0071] In the first embodiment, an electrochemical corrosion prevention unit (1) (a shaft sealing portion made of a resin material) is used, and a component that clamps the first shaft sealing component O1 is set to a guide body 20 made of a resin material. Therefore, even if liquid such as water penetrates from the external environment through the gap between the flange portion 12 and the housing H, or, for example, condensation water is generated on the outside of the guide body 1220 that has been cooled by a low-temperature internal fluid and invades and accumulates on the upper part of the first shaft sealing component O1, the existing problem point (external leakage caused by electrochemical corrosion) can be eliminated and the sealing performance can be improved.

[0072] <Concerns (Reduction in the strength of the shaft seal)>

[0073] The valve device 100a of the first embodiment adopts an electrochemical corrosion prevention unit (1) (a shaft seal part made of a resin material), and sets a part that clamps the first shaft seal component O1 as a guide body 20 made of a resin material. Generally, resin materials have lower pressure resistance than metal materials and are easily deformed. Therefore, if the insertion cylinder 27 of the guide body 20 having the shaft seal part is significantly deformed in the direction of the axis L or in the radial direction, the first shaft seal component O1 will not have the desired compression margin, and the sealing performance may be reduced (hereinafter referred to as "concern (reduction in pressure resistance of the shaft seal part)").

[0074] In contrast, the valve device 100a of the first embodiment can adopt a shaft seal reinforcement unit for reinforcing the insertion cylinder 27 having the shaft seal in addition to the electrochemical corrosion prevention unit (1) (shaft seal made of resin material), thereby eliminating concerns (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance. The shaft seal reinforcement unit in the first embodiment is composed of a shaft seal reinforcement unit (1) (fixing the housing to the flange), a shaft seal reinforcement unit (2) (cylindrical portion), a shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), a shaft seal reinforcement unit (4) (stepped portion of the flange), a shaft seal reinforcement unit (5) (through hole of the cylindrical portion), a shaft seal reinforcement unit (6) (concave and convex portion of the buried area), and a shaft seal reinforcement unit (7) (addition of a reinforcing agent to the resin material), and thus will be described in sequence below.

[0075] <Shaft seal reinforcement unit (1) (Fix the housing to the flange)>

[0076] Regarding the shaft seal reinforcement unit (1) (fixing the housing to the flange), as Figure 2 As shown, the inner circumference of the annular flange 12 is embedded in the guide body 20, and an insertion tube 27 is arranged adjacent to one end surface of the inner circumference of the flange 12. Figure 3 As shown in the figure, when viewed from the axis L, the housing 71 is fixed to the other end surface of the flange 12 via a welding portion W1 having an annular shape. The flange 12 is provided with a second end side step portion 12s1, and the outer diameter of the second end side step portion 12s1 is set to be equal to or slightly smaller than the inner diameter of one end of the housing 71. Thus, the housing 71 is fixed after being positioned to the flange 12 via the second end side step portion 12s1.

[0077] In the first embodiment, by adopting the shaft seal reinforcement unit (1) (fixing the housing to the flange), the flange 12 to which the housing 71 is fixed has a relatively high structural rigidity, and the pressure resistance of the inner circumference of the flange 12 is improved. In addition, the insertion tube 27 having the shaft seal is adjacent to one end surface of the inner circumference of the flange 12 having improved pressure resistance, so that the pressure resistance is mainly improved in the direction of the axis L, thereby eliminating concerns (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance.

[0078] <Shaft seal reinforcement unit (2) (cylindrical part)>

[0079] like Figure 2 as well as Figure 3As shown, the shaft seal reinforcement unit (2) (cylindrical portion) has a cylindrical portion 11 that is continuously formed and extends toward one end side in the direction of the axis L on the inner circumference side of the flange portion 12. The other end side of the cylindrical portion 11 is insert-molded relative to the guide body 20, and an annular groove 27a as an insertion cylinder of the shaft seal is adjacently arranged on the outer circumference side of the buried area of ​​the cylindrical portion 11.

[0080] In the first embodiment, by adopting the shaft seal reinforcement unit (2) (cylindrical portion), the cylindrical portion 11 formed continuously on the inner peripheral side of the flange portion 12 has a relatively high structural rigidity and improved pressure resistance. In addition, the annular groove 27a of the insert cylinder as the shaft seal is adjacently arranged on the outer peripheral side of the cylindrical portion 11 with improved pressure resistance, so that the pressure resistance in the radial direction is mainly improved, thereby eliminating the worry (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance.

[0081] <Shaft seal reinforcement unit (3) (fixing the valve seat member to the cylinder)>

[0082] like Figure 2 As shown, the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion) fixes the valve seat member 30 to one end of the cylindrical portion 11 via the welding portion W2. A boss portion 31 is formed on the other end side of the valve seat member 30, and the outer diameter of the boss portion 31 is set to be equal to or slightly smaller than the inner diameter of one end of the cylindrical portion 11. Thus, the valve seat member 30 is fixed after being positioned on the cylindrical portion 11 via the boss portion 31.

[0083] In the first embodiment, by adopting the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the cylindrical portion 11 to which the valve seat member 30 is fixed has a relatively high structural rigidity and improved pressure resistance. In addition, similarly to the shaft seal reinforcement unit (2) (cylindrical portion), the annular groove 27a of the insertion cylinder of the shaft seal is arranged adjacent to the outer peripheral side of the cylindrical portion 11 with improved pressure resistance, so that the radial pressure resistance is mainly improved, thereby eliminating the concern (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance. Furthermore, by making the valve seat member 30 a component different from the fixing metal member 10, it is not necessary to form the valve port 1a in the fixing metal member 10, so that the processing of the fixing metal member 10 is simplified, and the wall thickness of the valve seat of the valve port 1a can be formed thicker, so that stable valve leakage performance can be obtained.

[0084] <Shaft seal reinforcement unit (4) (stepped portion of flange)>

[0085] like Figure 3As shown, the shaft seal reinforcement unit (4) (the step portion of the flange portion) is provided with a step portion 12s1 on the other end side (see FIG. Figure 2 ) and one end side step portion 12s2 (refer to Figure 2 ) is formed into a circumferential step portion 12s. With respect to the flange portion 12, the inner circumference of the flange portion 12 is offset toward the other end side compared to the outer circumference with the step portion 12s as a boundary. The step portion 12s can be formed by, for example, performing a stamping process on the flange portion 12.

[0086] In the first embodiment, by adopting the shaft seal reinforcement unit (4) (the step portion of the flange portion), the rigidity becomes relatively high in the step portion 12s of the flange portion 12 due to work hardening caused by plastic deformation, and the pressure resistance of the inner peripheral side of the flange portion 12 is improved. In addition, similarly to the shaft seal reinforcement unit (1) (fixing the housing to the flange portion), the insertion cylinder 27 having the shaft seal portion is arranged adjacent to one end surface of the inner peripheral side of the flange portion 12 with improved pressure resistance, so that the pressure resistance is mainly improved in the direction of the axis L, thereby eliminating the concern (the pressure resistance of the shaft seal portion is reduced) and achieving further improvement of the sealing performance.

[0087] <Shaft seal reinforcement unit (5) (through hole in cylindrical portion)>

[0088] like Figure 3 As shown, the shaft seal reinforcement unit (5) (through hole of the cylindrical portion) is provided with at least one (for example, four) through holes 12e in the buried area of ​​the cylindrical portion 11 toward the guide body 20. When the fixing metal member 10 is insert-molded relative to the guide body 20, the resin material is solidified in a state of filling at least one through hole 12e. In addition, in the first embodiment, the plurality of through holes 12e are evenly arranged in the circumferential direction, but the invention is not limited thereto. For example, the plurality of through holes 12e may be unevenly arranged in the circumferential direction.

[0089] In the first embodiment, by adopting the shaft seal reinforcement unit (5) (the through hole in the cylindrical portion), the joint strength of the guide body 20 in the axial direction L and radial direction relative to the cylindrical portion 11 via the through hole 12e, that is, the pressure resistance, is improved, thereby eliminating concerns (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance.

[0090] <Shaft seal reinforcement unit (6) (concave and convex portion of buried area)>

[0091] like Figure 2As shown in FIG. 1 , the shaft seal reinforcement unit (6) (concavoconvex portion of the buried area) is provided with concavoconvex portions (not shown) on at least a portion of the buried area of ​​the cylindrical portion 11 and the flange portion 12 facing the guide body 20. In the first embodiment, the buried area provided with the concavoconvex portions is preferably provided on the outer peripheral surface of the other end side of the cylindrical portion 11 and the inner peripheral side end surface of the flange portion 12 (see FIG. Figure 2 In addition, as for the concavo-convex portion, a predetermined area of ​​the fixing metal member 10 made of a metal material such as stainless steel is subjected to a process of forming a micron-sized concavo-convex portion on the surface of the metal material by chemical etching or the like. As a result, when the fixing metal member 10 is insert-molded relative to the guide member body 20, the resin material is cured in a state of entering the concavo-convex portion, so that the bonding strength is further improved by the anchoring effect.

[0092] In the first embodiment, by adopting the shaft seal reinforcement unit (6) (the concavo-convex portion of the buried area), the joint strength of the guide body 20 in the axial L direction and / or radial direction relative to the fixed metal member 10 via the concavo-convex portion, that is, the pressure resistance is improved, thereby eliminating the worry (the pressure resistance of the shaft seal is reduced) and achieving further improvement in sealing performance. In addition, in the first embodiment, the buried area provided with the concavo-convex portion is set to the outer peripheral surface of the other end side of the cylindrical portion 11 and the inner peripheral side end surface of the flange portion 12 (refer to Figure 2 In the case of a continuous area in the circumferential direction of any one of the guide body 20 and the L-shaped area marked with "x" in the figure), no leakage path is formed through the boundary on the housing H side between the guide body 20 and the fixing metal fitting 10, so leakage to the external environment can be reliably suppressed. In addition, in the first embodiment, the boundary on the housing 71 side between the guide body 20 and the fixing metal fitting 10 is connected to the storage space 3 in the housing 71, so even if the bonding strength between the fixing metal fitting 10 and the guide body 20 is reduced, no leakage to the external environment occurs through the boundary on the housing 71 side.

[0093] <Shaft seal reinforcement unit (7) (addition of reinforcing agent to resin material)>

[0094] The shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material) is a resin material of the guide body 20 made of PPS with glass fiber or carbon fiber added as a reinforcing agent. The PPS with the added reinforcing agent has a very high tensile strength (for example, 150 MPa). In addition, the guide body 20 may also be a PPS with polytetrafluoroethylene (PTFE) added. The PPS with the added PTFE has good sliding properties, so the durability of the guide body 20 can be improved.

[0095] In the first embodiment, by adopting the shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material), the pressure resistance of the guide body 20 itself, that is, the insertion tube 27 having the shaft seal, in the axial L direction and the radial direction is improved, thereby eliminating concerns (reduction in the pressure resistance of the shaft seal) and achieving further improvement in sealing performance.

[0096] As described above, the valve device 100a of the first embodiment can improve the corrosion resistance by adopting the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material), thereby eliminating the existing problem (external leakage caused by electrochemical corrosion) and achieving improved sealing. In addition, the valve device 100a of the first embodiment can eliminate the concerns (reduction in the pressure resistance of the shaft seal portion) by adopting the shaft seal portion reinforcement unit (1) (fixing the housing to the flange portion), the shaft seal portion reinforcement unit (2) (cylindrical portion), the shaft seal portion reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the shaft seal portion reinforcement unit (4) (step portion of the flange portion), the shaft seal portion reinforcement unit (5) (through hole of the cylindrical portion), the shaft seal portion reinforcement unit (6) (concave and convex portion of the buried area) and the shaft seal portion reinforcement unit (7) (addition of a reinforcing agent to the resin material) to reinforce the insertion cylinder 27 having the shaft seal portion, thereby achieving further improved sealing.

[0097] The valve device 100a of the first embodiment adopts the electrochemical corrosion prevention unit (1) (shaft sealing portion made of resin material), and all of the parts from the shaft sealing portion reinforcement unit (1) (fixing the housing to the flange portion) to the shaft sealing portion reinforcement unit (7) (adding a reinforcing agent to the resin material), but is not limited to this. For example, the valve device 100a of the first embodiment may also adopt only the electrochemical corrosion prevention unit (1) (shaft sealing portion made of resin material). In addition, for example, the valve device 100a of the first embodiment may adopt at least one of the parts from the shaft sealing portion reinforcement unit (1) (fixing the housing to the flange portion) to the shaft sealing portion reinforcement unit (7) (adding a reinforcing agent to the resin material) in addition to the electrochemical corrosion prevention unit (1) (shaft sealing portion made of resin material) (for example, the shaft sealing portion reinforcement unit (1) (fixing the housing to the flange portion) or the shaft sealing portion reinforcement unit (7) (adding a reinforcing agent to the resin material)).

[0098] (Modification of the Shaft Seal of the First Embodiment)

[0099] use Figure 5A valve device 100b of a modified example of the shaft seal of the first embodiment is described. Since the valve device 100b of the modified example of the shaft seal of the first embodiment adopts a shaft seal reinforcement unit (8) (a cylindrical insertion cylinder) and a shaft seal reinforcement unit (9) (a cylindrical valve seat member), it is different from the valve device 100a of the first embodiment in the clamping unit of the first shaft seal member O1 and the clamping unit of the second shaft seal member O2, but the other structures are the same as those of the first embodiment. The same symbols are marked on the same structures, and repeated descriptions are omitted.

[0100] <Shaft seal reinforcement unit (8) (cylindrical insertion tube)>

[0101] The shaft seal reinforcement unit (8) (cylindrical insertion tube) sets the shaft seal as the insertion tube annular surface 27b (shaft seal) in the insertion tube 27B of the guide body 20B, and clamps the first shaft seal component O1 between the first seal component receiving groove Gs1 (shaft seal component receiving groove) formed in the first receiving groove G1 of the housing HB.

[0102] In the modified example of the shaft seal portion of the first embodiment, by adopting the shaft seal portion reinforcement unit (8) (cylindrical insertion tube), it is not necessary to provide the insertion tube annular groove 27a in the insertion tube 27 as in the first embodiment, so the structural rigidity of the insertion tube 27B is relatively high, and the pressure resistance is improved, so that the worry (the pressure resistance of the shaft seal portion is reduced) can be eliminated, and the sealing performance can be reliably further improved. In addition, the shape of the guide body 20B (particularly the shape of the insertion tube 27B) can be simplified, so that the cost can be reduced.

[0103] <Shaft seal reinforcement unit (9) (cylindrical valve seat member)>

[0104] The shaft seal reinforcing means (9) (cylindrical valve seat member) sandwiches the second shaft seal member O2 between the outer peripheral surface 33B of the valve seat member 30B and the second seal member receiving groove Gs2 formed in the second receiving groove G2 of the housing HB.

[0105] In the modified example of the shaft seal of the first embodiment, by adopting the shaft seal reinforcement unit (9) (cylindrical valve seat member), it is not necessary to provide the valve seat member annular groove 32 in the valve seat member 30 as in the first embodiment, so the rigidity of the valve seat member 30B is relatively high. Therefore, in the modified example of the shaft seal of the first embodiment, similarly to the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the pressure resistance of the insert cylinder annular surface 27b of the shaft seal is improved mainly in the radial direction by fixing the cylindrical portion 11 of the valve seat member 30B, so that the concern (reduction in the pressure resistance of the shaft seal) can be eliminated, and the sealing performance can be further improved reliably. In addition, the shape of the valve seat member 30B can be simplified, so that the cost can be reduced.

[0106] As described above, the valve device 100b in the modified example of the shaft seal of the first embodiment can eliminate the existing problem (external leakage caused by electrochemical corrosion) and achieve improved sealing performance by adopting the electrochemical corrosion prevention unit (1) (shaft seal made of resin material) as in the first embodiment. In addition, the valve device 100b in the modified example of the shaft seal of the first embodiment can eliminate the worry (reduction in the pressure resistance of the shaft seal) and achieve further improved sealing performance by adopting the shaft seal reinforcement unit (1) (fixing the housing to the flange), the shaft seal reinforcement unit (2) (cylindrical part), the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical part), the shaft seal reinforcement unit (4) (stepped part of the flange), the shaft seal reinforcement unit (5) (through hole of the cylindrical part), the shaft seal reinforcement unit (6) (concave and convex part of the buried area) and the shaft seal reinforcement unit (7) (addition of a reinforcing agent to the resin material) as in the first embodiment. Furthermore, the valve device 100b in the modified example of the shaft sealing portion of the first embodiment can eliminate concerns (reduction in the pressure resistance of the shaft sealing portion) and reliably achieve further improvement in sealing performance by adopting a shaft sealing portion reinforcement unit (8) (a cylindrical insertion cylinder) and a shaft sealing portion reinforcement unit (9) (a cylindrical valve seat component).

[0107] The valve device 100b in the modified example of the shaft seal portion of the first embodiment adopts the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material) and all of the parts from the shaft seal portion reinforcement unit (1) (fixing the housing to the flange portion) to the shaft seal portion reinforcement unit (9) (cylindrical valve seat member), but is not limited to this. For example, the valve device 100b in the modified example of the shaft seal portion of the first embodiment may also adopt only the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material). In addition, for example, the valve device 100b in the modified example of the shaft seal portion of the first embodiment may adopt at least one of the parts from the shaft seal portion reinforcement unit (1) (fixing the housing to the flange portion) to the shaft seal portion reinforcement unit (9) (cylindrical valve seat member) (for example, the shaft seal portion reinforcement unit (1) (fixing the housing to the flange portion) or the shaft seal portion reinforcement unit (7) (adding a reinforcing agent to the resin material)) in addition to the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material).

[0108] (Second Embodiment)

[0109] use Figure 6 The valve device 100c of the second embodiment is described. The valve device 100c of the second embodiment is different from the valve device 100a of the first embodiment mainly in the outer shape of the flange portion 12C of the fixing metal member 10C and the use of the fixing plate 13, but the other basic structures are roughly the same as those of the first embodiment. Among them, the same symbols are marked for the same structures, and repeated descriptions are omitted. In addition, the housing 71C and the coil bracket 73Ca of the stator coil 73C in the second embodiment (see Fig.10 ) is slightly different from the first embodiment in length of the housing 71 and the coil bracket 73a of the stator coil 73 in the direction of the axis L, but the structure is the same, so the description is omitted.

[0110] The valve device 100c of the second embodiment mainly comprises a fixing member 10C, a fixing plate 13, a guide body 20 (valve body), a valve seat member 30, a drive shaft 40, a valve core 50, a coil member 60, and a stepping motor 70C. The fixing member 10C, the fixing plate 13, and the housing HC to which the valve device 100c is mounted, which differ in structure from the first embodiment, are described in order below (see Figure 8 ).

[0111] <About fixing hardware>

[0112] The fixing member 10C includes a cylindrical portion 11 which is made of a metal material such as stainless steel and extends in the direction of the axis L and has a cylindrical shape, and a flange portion 12C which is formed continuously with the cylindrical portion 11. An opening 12a which defines a side opening 1b is formed on the side wall of the cylindrical portion 11. Fig. 9 As shown, when viewed from the axis L direction, the flange portion 12C has a circular ring shape.

[0113] <About the fixing plate>

[0114] The fixing plate 13 is made of metal materials such as aluminum, stainless steel, plated steel, or resin materials, such as Figure 7 As shown in (a), when viewed from the axis L, the fixing plate 13 has a substantially rhombus shape with rounded corners. The fixing plate 13 has an insertion hole 13a provided with the axis L as the center and a pair of mounting holes 13b provided at both ends in the longitudinal direction. Figure 7 As shown in (b), the threaded hole 13c (bracket fixing mechanism) for the coil bracket in the second embodiment is formed on the side wall of the fixing plate 13 instead of the side wall of the housing H in the first embodiment. Figure 6 As shown, before the stator coil 73C is fixedly arranged on the outer peripheral surface of the housing 71C, the housing 71C is inserted into the insertion hole 13a of the fixing plate 13. In addition, a pair of fastening screws 12f are inserted into the pair of mounting holes 13b via fastening washers 12g.

[0115] The housing HC is made of a metal material such as aluminum. Figure 8 as well as Fig. 9 The shape of the housing HC will be described. Fig. 9 yes Figure 8 In the enlarged cross-sectional view taken along line IX-IX, the valve core portion 50 is omitted for the sake of convenience.

[0116] like Figure 8 As shown, a through hole having a plurality of annular step portions that are gradually reduced in diameter from the other end side to the one end side is formed in the housing HC along the axis L direction. The plurality of annular step portions are sequentially formed with a flange receiving groove Gf, a first receiving groove G1, and a second receiving groove G2. Among them, a flange receiving groove Gf is formed in the second receiving groove G2 with a side ( Figure 8 The first flow path Fp1 is connected to the front side of the paper, and the first receiving groove G1 is formed with a side ( Figure 8 The valve body 52 of the second flow path (not shown) is connected to the valve body 52 of the second flow path (not shown). In addition, a pair of threaded holes Sh are formed at symmetrical positions across the first receiving groove G1 on the upper surface H1 of the housing HC.

[0117] Furthermore, in the second embodiment, Figure 8 as well as Fig. 9 Although the shape of the housing HC shown in the figure has been described, this is only an example, and the housing HC may have any shape as long as it has an insertion hole and an outer shape that allows the valve device 100c to be inserted into the insertion hole.

[0118] <About the installation action of the valve device>

[0119] use Figure 8 as well as Fig.10 , the installation operation of the valve device 100c to the housing HC is described. Figure 8 As shown, the valve device 100c is inserted from the first receiving groove G1 along the axis L direction of the housing HC. Then, while the pair of fastening screws 12f are screwed into the pair of threaded holes Sh via the fastening washers 12g and the pair of mounting holes 13b, the valve device 100c is moved toward one end side in the axis L direction until the outer peripheral portion of one end side of the flange portion 12C is received in the flange portion receiving groove Gf and abuts against the upper surface H1 of the housing HC. At this time, the second shaft seal member O2 is clamped between the second receiving groove G2 and the valve seat member annular groove 32 of the valve seat member 30, the first receiving groove G1 and the second receiving groove G2 are sealed, and the first shaft seal member O1 is clamped between the first receiving groove G1 and the insertion tube annular groove 27a, and the first receiving groove G1 and the external environment are sealed.

[0120] Then, if Fig.10 As shown, by screwing the fastening screw 73Cb into the mounting hole (not shown) of the coil bracket 73Ca made of metal material and the threaded hole 13c for the coil bracket formed on the side wall of the fixing plate 13 (see Figure 7 (b)), thereby fixing the stator coil 73C to the housing HC. As a result, the stator coil 73C can be reliably fixed to the housing HC via the fixing plate 13. In addition, there is no need to provide a threaded hole as a bracket fixing mechanism in the housing HC, so the design freedom of the housing HC is improved. In the installed state of the valve device 100c, the valve port 1a defined by the valve seat member 30 is connected to the first piping Pl1 via the first flow path Fp1 and the sealing joint Pf fixed to the housing HC by the fastening bolts Fb, and on the other hand, the side port 1b defined by the opening portion 12a of the cylindrical portion 11 is connected to the second piping (not shown) via the second flow path.

[0121] <Concerns (Management of the pressure resistance of the shaft seal)>

[0122] The valve device 100a of the first embodiment, in addition to the electrochemical corrosion prevention unit (1) (the shaft sealing part made of resin material), also adopts a shaft sealing part reinforcement unit (shaft sealing part reinforcement unit (1) (fixing the housing to the flange part) to the shaft sealing part reinforcement unit (7) (adding a reinforcing agent to the resin material), etc., so that even if a relatively high pressure fluid is introduced, the existing problem point (external leakage caused by electrochemical corrosion) can be eliminated and the sealing performance can be improved.

[0123] However, in the valve device 100a of the first embodiment, the pressure resistance and the direction of action (axis L direction and / or radial direction) of the shaft seal part are different depending on the (combination of) shaft seal part reinforcement units used. Therefore, in the valve device 100a of the first embodiment, when it is necessary to deal with extremely high-pressure fluids, it is necessary to manage the pressure resistance (sum) of the shaft seal part in the axis L direction to be above the required value by the (combination of) shaft seal part reinforcement units (hereinafter referred to as "concerns (management of pressure resistance of shaft seal part)").

[0124] In view of this, the valve device 100c of the second embodiment adopts a shaft seal reinforcement unit (10) (fixing plate) in addition to the electrochemical corrosion prevention unit (1) (shaft seal unit made of resin material), so that even if it is necessary to temporarily deal with extremely high-pressure fluid, it is possible to eliminate concerns (management of the pressure resistance of the shaft seal unit) and reliably achieve improved sealing performance. In addition, in the valve device 100c of the second embodiment, the shaft seal reinforcement unit (1) (fixing the housing to the flange part), the shaft seal reinforcement unit (2) (cylindrical part), the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical part), the shaft seal reinforcement unit (4) (stepped part of the flange part), the shaft seal reinforcement unit (5) (through hole of the cylindrical part), the shaft seal reinforcement unit (6) (concave and convex part of the buried area) and the shaft seal reinforcement unit (7) (addition of a reinforcing agent to the resin material) are used as the shaft seal reinforcement unit, but the description thereof is omitted due to duplication.

[0125] <Shaft seal reinforcement unit (10) (fixed plate)>

[0126] First, the fixing plate 13 is a relatively thick plate made of a high-rigidity material (for example, a metal material such as aluminum, stainless steel, or a resin material). Figure 7 As shown in FIG. 1 , when viewed from the axis L, the housing 71C has a substantially rhombus shape with rounded corners, and includes an insertion hole 13a provided with the axis L as the center and a pair of mounting holes 13b provided at both ends in the longitudinal direction. The housing 71C is inserted into the insertion hole 13a. In addition, a pair of fastening screws 12f are inserted into the pair of mounting holes 13b via fastening washers 12g.

[0127] In the second embodiment, when the fixing plate 13 is made of a resin material, PPS is used. In this case, the fixing plate 13 can have a very high tensile strength (for example, 150 MPa) by using PPS to which glass fiber or carbon fiber is added as a reinforcing agent.

[0128] like Figure 8As shown, the shaft seal reinforcement unit (10) (fixed plate) has a fixed plate 13 that clamps the flange portion 12C between the housing HC. Fig. 9 As shown, when viewed from the axis L direction, the fixing plate 13 overlaps with the outer peripheral portion of the flange portion 12C.

[0129] Thus, in the second embodiment, by adopting the shaft seal reinforcement unit (10) (fixing plate), the flange 12 firmly fixed by the fixing plate 13 has extremely high structural rigidity, and the pressure resistance of the inner peripheral side of the flange 12 is greatly improved. In addition, the insertion tube 27 having the shaft seal is adjacently arranged on one end surface of the inner peripheral side of the flange 12 with improved pressure resistance, so that the pressure resistance of the shaft seal in the direction of the axis L is greatly improved, so that the concern (the pressure resistance of the shaft seal decreases) can be eliminated, and the sealing performance can be further improved. Therefore, in the second embodiment, instead of managing the pressure resistance of the shaft seal in different directions (axis L direction and / or radial direction) by the shaft seal reinforcement unit (combination) adopted as in the first embodiment, the shaft seal reinforcement unit (10) (fixing plate) is adopted to uniformly manage the pressure resistance of the shaft seal in the direction of the axis L to be equal to or higher than the required value, thereby eliminating the concern (management of the pressure resistance of the shaft seal), and the sealing performance can be further improved.

[0130] As described above, the valve device 100c of the second embodiment is similar to the first embodiment, and by adopting the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material), the existing problem (external leakage caused by electrochemical corrosion) can be eliminated, and the sealing performance can be improved. In addition, the valve device 100c of the second embodiment is similar to the first embodiment, and by adopting the shaft seal reinforcement unit (1) (fixing the housing to the flange portion), the shaft seal reinforcement unit (2) (cylindrical portion), the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the shaft seal reinforcement unit (4) (stepped portion of the flange portion), the shaft seal reinforcement unit (5) (through hole of the cylindrical portion), the shaft seal reinforcement unit (6) (concave and convex portion of the buried area), and the shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material), it is possible to eliminate the worry (reduction in the pressure resistance of the shaft seal portion) and further improve the sealing performance. Furthermore, the valve device 100c of the second embodiment can eliminate concerns (management of the pressure resistance strength of the shaft seal portion) by adopting the shaft seal portion reinforcement unit (10) (fixing plate), thereby achieving further improvement in sealing performance.

[0131] The valve device 100c of the second embodiment adopts the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material), and all of the parts from the shaft seal reinforcement unit (1) (fixing the housing to the flange portion) to the shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material), and the shaft seal reinforcement unit (10) (fixing plate), but is not limited to this. For example, the valve device 100c of the second embodiment may also adopt only the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material). In addition, for example, the valve device 100c of the second embodiment may adopt at least one of the parts from the shaft seal reinforcement unit (1) (fixing the housing to the flange portion) to the shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material) and the shaft seal reinforcement unit (10) (fixing plate) in addition to the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material).

[0132] (Third Embodiment)

[0133] use Fig.11 The valve device 100d of the third embodiment is described. The valve device 100d of the third embodiment is different from the valve device 100c of the second embodiment in that an anti-corrosion member 14 for preventing electrochemical corrosion is arranged between the fixing plate 13 and the housing HC and the flange portion 12C, but the other basic structures are substantially the same as those of the second embodiment. The same symbols are given to the same structures, and repeated descriptions are omitted.

[0134] <Concerns (Contact area reduction due to electrochemical corrosion)>

[0135] First, in the valve device 100a of the first embodiment, as Figure 2 As shown, if liquid such as water may penetrate from the external environment through the gap between the flange 12 and the housing H. At this time, assuming that the flange 12 and the housing H are made of different metals and placed in a contact state in an environment where electricity such as water easily flows, electrochemical corrosion may occur at the boundary between the flange 12 and the housing H. However, in the valve device 100a of the first embodiment, the pressure introduced is not high compared to the second embodiment, so electrochemical corrosion at the boundary between the flange 12 and the housing H does not become a problem. On the other hand, in order to reliably prevent electrochemical corrosion at the shaft seal portion, an electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material) is used.

[0136] Then, if Figure 8As shown, the valve device 100c of the second embodiment adopts the shaft seal reinforcement unit (10) (fixed plate), but if liquid such as water penetrates from the external environment through the gap between the one end side contact surface 13D of the fixed plate 13 and the upper surface H1 of the housing HC, electrochemical corrosion may occur at the boundary between the fixed plate 13 and the housing H. If the electrochemical corrosion of the boundary between the fixed plate 13 and the housing H is left unchecked, rust or the like will occur at the boundary between the fixed plate 13 and the flange 12C located at the periphery, and the contact area between the fixed plate 13 and the flange 12C will decrease, that is, the pressure resistance of the shaft seal may be reduced by the fixed plate 13 (hereinafter referred to as "concern (reduction in contact area due to electrochemical corrosion)"). In this case, in the valve device 100c of the second embodiment, when it is necessary to stably handle extremely high-pressure fluid, leakage to the external environment may occur due to the reduction in the pressure resistance of the shaft seal caused by the fixed plate 13.

[0137] In contrast, the valve device 100d of the third embodiment adopts an electrochemical corrosion prevention unit (2) (anti-corrosion component) in addition to the electrochemical corrosion prevention unit (1) (shaft seal unit made of resin material), thereby eliminating the concern (reduction of contact area due to electrochemical corrosion) and reliably achieving improved sealing performance. In addition, in the valve device 100d of the third embodiment, the shaft seal reinforcement unit (1) (fixing the housing to the flange), the shaft seal reinforcement unit (2) (cylindrical portion), the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the shaft seal reinforcement unit (4) (stepped portion of the flange), the shaft seal reinforcement unit (5) (through hole of the cylindrical portion), the shaft seal reinforcement unit (6) (concave and convex portion of the buried area), the shaft seal reinforcement unit (7) (addition of a reinforcing agent to the resin material) and the shaft seal reinforcement unit (10) (fixing plate) are also adopted as the shaft seal reinforcement unit, similarly to the valve device 100c of the second embodiment, but the description thereof is omitted due to duplication.

[0138] <Electrochemical Corrosion Prevention Unit (2) (Corrosion Prevention Part)>

[0139] like Fig.11 As shown, the electrochemical corrosion prevention unit (2) (corrosion-resistant component) is provided with an anti-corrosion component 14 (for example, a sheet-shaped component such as resin or rubber having no inherent potential) for preventing electrochemical corrosion between the fixing plate 13 and the housing HC and the flange portion 12C.

[0140] In the third embodiment, by adopting an electrochemical corrosion prevention unit (2) (anti-corrosion component), an anti-corrosion component 14 that does not have an inherent potential is interposed between the fixing plate 13 and the housing HC and the flange portion 12C, thereby improving corrosion resistance and eliminating concerns (reduction in contact area due to electrochemical corrosion), thereby maintaining the pressure resistance of the fixing plate 13 to the shaft sealing portion. As a result, a further improvement in sealing performance can be achieved.

[0141] <Electrochemical Corrosion Prevention Unit (3) (Surface Corrosion Prevention Treatment Unit)>

[0142] In addition, in the third embodiment, in order to improve the corrosion resistance between the fixing plate 13 and the housing HC and the flange portion 12C, an electrochemical corrosion prevention unit (2) (corrosion prevention component) is used, but the present invention is not limited to this. For example, in the third embodiment, instead of the electrochemical corrosion prevention unit (2) (corrosion prevention component), an electrochemical corrosion prevention unit (3) (surface corrosion prevention treatment portion) may be used, that is, the fixing plate 13 is made of, for example, a plated steel plate, and a surface treatment portion (for example, zinc plating, chrome plating, nickel plating, etc.) for preventing electrochemical corrosion is provided on at least the surface facing the housing HC and the flange portion 12C.

[0143] As described above, the valve device 100d of the third embodiment is similar to the second embodiment, and by adopting the electrochemical corrosion prevention unit (1) (shaft seal portion made of resin material), the existing problem (external leakage caused by electrochemical corrosion) can be eliminated, and the sealing performance can be improved. In addition, the valve device 100d of the third embodiment is similar to the second embodiment, and by adopting the shaft seal reinforcement unit (1) (fixing the housing to the flange portion), the shaft seal reinforcement unit (2) (cylindrical portion), the shaft seal reinforcement unit (3) (fixing the valve seat member to the cylindrical portion), the shaft seal reinforcement unit (4) (stepped portion of the flange portion), the shaft seal reinforcement unit (5) (through hole of the cylindrical portion), the shaft seal reinforcement unit (6) (concave and convex portion of the buried area), and the shaft seal reinforcement unit (7) (adding a reinforcing agent to the resin material), it is possible to eliminate the worry (reduction in the pressure resistance of the shaft seal portion) and further improve the sealing performance. Furthermore, the valve device 100d of the third embodiment can eliminate concerns (management of the pressure resistance of the shaft seal) by adopting the shaft seal reinforcement unit (10) (fixing plate) and further improve the sealing performance. In addition, the valve device 100d of the third embodiment can eliminate concerns (reduction of the contact area due to electrochemical corrosion) by adopting the electrochemical corrosion prevention unit (2) (anti-corrosion component) or the electrochemical corrosion prevention unit (3) (surface anti-corrosion treatment unit) and reliably improve the sealing performance.

[0144] The valve device 100d of the third embodiment adopts the electrochemical corrosion prevention unit (1) (shaft sealing part made of resin material), the electrochemical corrosion prevention unit (2) (anti-corrosion component) (or the electrochemical corrosion prevention unit (3) (surface anti-corrosion treatment part)), and the entirety of the shaft sealing part reinforcement unit (1) (fixing the housing to the flange part) to the shaft sealing part reinforcement unit (7) (adding a reinforcing agent to the resin material), and the shaft sealing part reinforcement unit (10) (fixing plate), but is not limited to this. For example, the valve device 100d of the third embodiment may also adopt only the electrochemical corrosion prevention unit (1) (shaft sealing part made of resin material). In addition, for example, the valve device 100d of the third embodiment can also adopt at least one of the shaft sealing part reinforcement unit (1) (fixing the outer shell to the flange part) to the shaft sealing part reinforcement unit (7) (adding a reinforcing agent to the resin material), the shaft sealing part reinforcement unit (10) (fixing plate), the electrochemical corrosion prevention unit (2) (anti-corrosion component) (or the electrochemical corrosion prevention unit (3) (surface anti-corrosion treatment part)) in addition to the electrochemical corrosion prevention unit (1) (shaft sealing part made of resin material). For example, the shaft sealing part reinforcement unit (1) (fixing the outer shell to the flange part) or the shaft sealing part reinforcement unit (7) (adding a reinforcing agent to the resin material)).

[0145] In addition, only in the third embodiment, the case of using the electrochemical corrosion prevention unit (2) (corrosion prevention component) or the electrochemical corrosion prevention unit (3) (surface corrosion prevention treatment unit) is described, but it is not limited to this. For example, in the first embodiment (refer to Figure 2 ) and a modified example of the shaft seal portion of the first embodiment (see Figure 5 ) An electrochemical corrosion prevention unit (2) (anti-corrosion component) or an electrochemical corrosion prevention unit (3) (surface anti-corrosion treatment portion) is used on one end side of the flange portion 12 that contacts the shell H, HB.

[0146] In addition, only in the modification of the shaft seal portion of the first embodiment, the case where the shaft seal portion reinforcement unit (8) (cylindrical insertion cylinder) and / or the shaft seal portion reinforcement unit (9) (cylindrical valve seat member) are used is described, but the present invention is not limited to this. For example, as the second embodiment (refer to Figure 8 ) and the third embodiment (refer to Fig.11 ) in the insert cylinder 27 and / or the valve seat component 30, the shaft sealing portion reinforcement unit (8) (cylindrical insert cylinder) and / or the shaft sealing portion reinforcement unit (9) (cylindrical valve seat component) may also be used.

[0147] <Others>

[0148] The valve devices 100a to 100d of this embodiment can be applied to all fluid devices and fluid circuits including refrigeration cycles. The present invention is not limited to the above-mentioned embodiments, and appropriate changes and modifications can be made without departing from the technical concept of the present invention.

Claims

1. A valve device housed in a housing made of a metal material, the valve device comprising: a valve body having a shaft sealing portion; a housing fixed to the valve body and defining a storage space; and Electrochemical corrosion prevention unit, The electrochemical corrosion prevention unit is formed by forming a valve body with a resin material, and clamping the shaft sealing component between a shaft sealing component storage groove which is arranged opposite to each other in the radial direction and formed on one side of the shaft sealing part and the housing and an annular surface formed on the other side of the shaft sealing part and the housing, thereby sealing the storage space from the external environment.

2. The valve device according to claim 1, characterized in that Also available: a fixing metal member having a flange portion in an annular shape, wherein the inner peripheral side of the flange portion is insert-molded in the valve body; and a shaft seal reinforcement unit for reinforcing the shaft seal, The shaft seal portion reinforcement unit fixes the housing to the other end surface of the flange portion, and arranges the shaft seal portion adjacent to one end surface on the inner peripheral side of the flange portion.

3. The valve device according to claim 2, characterized in that The shaft seal reinforcement unit includes a cylindrical portion extending and continuously formed toward one end in the axial direction on the inner circumferential side of the flange portion, and the shaft seal is disposed adjacent to the outer circumferential side of the cylindrical portion insert-molded in the valve body.

4. The valve device according to claim 3, characterized in that The shaft seal portion reinforcing unit fixes a valve seat member at one end of the cylindrical portion.

5. The valve device according to claim 2, characterized in that The shaft seal reinforcement unit has a circumferential step portion provided on the flange portion adjacent to the outer peripheral side of the shaft seal portion when viewed in the axial direction, and the inner peripheral side of the flange portion is offset toward the other end side relative to the outer peripheral side with the step portion as a boundary.

6. The valve device according to claim 3, characterized in that The shaft seal portion reinforcing unit is provided with at least one through hole in a region of the cylindrical portion that is buried in the valve body.

7. The valve device according to claim 3, characterized in that The shaft seal portion reinforcing means is provided with a concavo-convex portion in at least a portion of a region where the cylindrical portion and the flange portion are buried in the valve body.

8. The valve device according to claim 1, characterized in that The resin material is PPS with glass fiber or carbon fiber added as a reinforcement.

9. The valve device according to claim 2, characterized in that The shaft seal portion reinforcing unit includes a fixing plate that sandwiches the flange portion between the fixing plate and the housing.

10. The valve device according to claim 9, characterized in that The fixing plate includes a bracket fixing mechanism for the coil.

11. The valve device according to claim 9, characterized in that The electrochemical corrosion prevention unit includes an anti-corrosion member for preventing electrochemical corrosion disposed between the fixing plate and the housing and the flange.

12. The valve device according to claim 9, characterized in that The electrochemical corrosion prevention unit includes a surface anti-corrosion treatment portion for preventing electrochemical corrosion on at least a surface of the fixing plate that faces the housing and the flange portion.

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