Valve device

Abstract

To provide a valve device capable of solving backlash of a screw part by a simple structure.SOLUTION: In a water path switch valve 1, a valve shaft 15 is provided with a valve 14 on one end side and is equipped with a cylindrical screw part 32 on the other end side in an axial direction of the valve shaft 15. An actuator 16 is equipped with a rotor shaft 41, and the rotor shaft 41 is equipped with a rotation shaft screw part 42 on one end side in the axial direction of the rotor shaft 41. The cylindrical screw part 32 and the rotation shaft screw part 42 are screwed with each other. When the rotor shaft 41 rotates around a center axis of the rotor shaft 41, the valve shaft 15 moves in an axial direction of the valve shaft 15, and the valve 14 abuts on / separates from a seat 13. A reciprocating portion sealing member 181 is provided between a housing 12 and the valve shaft 15.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This disclosure relates to a valve device.

Background Art

[0002] Patent Document 1 discloses a valve device (EGR valve) in which a male screw provided at the other end of a valve shaft is screwed with a female screw provided on an actuator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the valve device disclosed in Patent Document 1, there is backlash in the screw portion (that is, between the male screw of the valve shaft and the female screw of the actuator). Therefore, in order to stably move the valve body, a dedicated spring for eliminating the backlash of the screw portion (that is, taking up the play) is required. As a result, the configuration of the valve device may become complicated.

[0005] Therefore, this disclosure has been made to solve the above problems, and an object thereof is to provide a valve device capable of eliminating the backlash of the screw portion with a simple configuration.

Means for Solving the Problems

[0006] <00One embodiment of the present disclosure made to solve the above problems is a valve device comprising a housing having a flow path, a valve seat provided in the flow path, a valve body that contacts and separates from the valve seat, a valve stem disposed inside the housing and on which the valve body is provided, and an actuator that moves the valve stem in the axial direction of the valve stem, wherein the valve stem has the valve body provided at one end and a valve stem threaded portion at the other end in the axial direction of the valve stem, the actuator has an axial rotating shaft, the rotating shaft has a rotating shaft threaded portion at one end in the axial direction of the rotating shaft, the valve stem threaded portion and the rotating shaft threaded portion are screwed together, the valve stem moves in the axial direction of the valve stem as the rotating shaft rotates about the axis of the rotating shaft, the valve body contacts and separates from the valve seat, and a first sealing member is provided between the housing and the valve stem. A second seal member is provided between the housing and the rotating shaft at a position closer to the actuator than the first seal member. It is characterized by the following.

[0007] According to this embodiment, since the first sealing member is provided, the space between the flow path and the actuator can be sealed, and the intrusion of fluid into the actuator can be suppressed.

[0008] Furthermore, during the movement of the valve body, the first sealing member acts as resistance to the movement of the valve stem. This eliminates backlash in the threaded portion (i.e., backlash between the valve stem threaded portion and the rotating shaft threaded portion). Therefore, there is no need to provide a dedicated spring for the backlash in the threaded portion, and it can be eliminated with a simple configuration. Furthermore, the provision of a second sealing member allows for a seal between the first sealing member and the actuator. Therefore, even if fluid leaks from the first sealing member, it is possible to prevent the fluid from entering the actuator.

[0011] In the above embodiment, the valve device is a three-way valve having an internal passage, an inflow passage for introducing fluid into the internal passage, a first outflow passage for discharging the fluid from the internal passage and provided on the actuator side with respect to the internal passage, and a second outflow passage for discharging the fluid from the internal passage and provided on the side opposite to the actuator with respect to the internal passage, wherein the valve seat comprises a first valve seat disposed on the first outflow passage side of the internal passage and a second valve seat disposed on the second outflow passage side of the internal passage, and the valve body comprises a first valve body that contacts and separates from the first valve seat on the internal passage side and a second valve body that contacts and separates from the second valve seat on the internal passage side.

[0012] According to this embodiment, when the first valve body abuts against the first valve seat and the first outflow passage becomes fully closed, or when the second valve body abuts against the second valve seat and the second outflow passage becomes fully closed, even if the step motor constituting the actuator loses step, the fluid pressure can maintain the first outflow passage and the second outflow passage in a fully closed state.

[0013] In the above embodiment, the valve device is a three-way valve having an internal passage, an inflow passage for introducing fluid into the internal passage, a first outflow passage for discharging the fluid from the internal passage and provided on the actuator side relative to the internal passage, and a second outflow passage for discharging the fluid from the internal passage and provided on the opposite side of the internal passage from the actuator. The valve seat comprises a first valve seat disposed on the first outflow passage side of the internal passage and a second valve seat disposed on the second outflow passage side of the internal passage. The valve body comprises a first valve body that contacts and separates from the first valve seat on the first outflow passage side and a second valve body that contacts and separates from the second valve seat on the second outflow passage side. Preferably, the first valve seat and the second valve seat are each provided with an elastic member.

[0014] According to this embodiment, when the first valve body abuts against the first valve seat and the first outflow passage becomes fully closed, or when the second valve body abuts against the second valve seat and the second outflow passage becomes fully closed, even if the step motor constituting the actuator loses step, the first outflow passage and the second outflow passage can be maintained in a fully closed state by the follow-up due to the elastic force of the elastic member.

[0015] In the above embodiment, it is preferable that the valve device is a water channel switching valve that switches the flow path of water.

[0016] According to this embodiment, water intrusion into the actuator can be suppressed, and the valve body can be biased using water pressure. 。 [Effects of the Invention]

[0017] According to the valve device of this disclosure, backlash in the screw portion can be eliminated with a simple configuration. [Brief explanation of the drawing]

[0018] [Figure 1] This diagram shows the valve device of the first embodiment (first open valve state). [Figure 2] This diagram shows the valve device of the first embodiment (second open valve state). [Figure 3] This diagram shows the seal structure and its surrounding area. [Figure 4] This diagram shows the valve when it is lowered in the first embodiment. [Figure 5] This is a magnified view of the screw threads as shown in Figure 4. [Figure 6] This figure shows the first embodiment, specifically when the second valve abuts against the second seat. [Figure 7] This is a magnified view of the screw threads as shown in Figure 6. [Figure 8] This diagram shows the valve rising in the first embodiment. [Figure 9] This is a magnified view of the screw threads as shown in Figure 8. [Figure 10] This is a diagram showing the situation when the first valve hits the first sheet in the first embodiment. [Figure 11] This is an enlarged view of the threaded portion at the time of FIG. 10. [Figure 12] This is a diagram showing the situation when the valve descends in the second embodiment. [Figure 13] This is a diagram showing the situation when the first valve hits the first sheet in the second embodiment. [Figure 14] This is an enlarged view of the threaded portion at the time of FIG. 13. [Figure 15] This is a diagram showing the situation when the valve ascends in the second embodiment. [Figure 16] This is a diagram showing the situation when the second valve hits the second sheet in the second embodiment. [Figure 17] This is an enlarged view of the threaded portion at the time of FIG. 16.

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of the valve device of the present disclosure will be described. In the following description, the waterway switching valve 1, which is an example of the embodiment of the valve device of the present disclosure, will be described. This waterway switching valve 1 is a valve that switches a flow path through which water (hereinafter, for example, "cooling water" is cited as an example) flows.

[0020] <First Embodiment> First, the first embodiment will be described.

[0021] (Outline description of the waterway switching valve) As shown in FIGS. 1 and , the waterway switching valve 1 of the present embodiment includes a housing 12 having a flow path, a sheet 13, a valve 14, a valve shaft 15, an actuator 16, a bearing 17, and a seal structure portion 18.

[0022] The waterway switching valve 1 is a three-way valve having an internal flow path 11, one inflow path 21, and two outflow paths (that is, a first outflow path <0000 and a second outflow path 23) as flow paths provided in the housing 12.

[0023] The inflow channel 21 is a channel that allows cooling water to flow into the internal channel 11. The first outflow channel 22 is a channel that allows cooling water to flow out of the internal channel 11 and is located on the actuator 16 side relative to the internal channel 11. The second outflow channel 23 is a channel that allows cooling water to flow out of the internal channel 11 and is located on the side of the internal channel 11 opposite to the actuator 16.

[0024] The sheet 13 is provided in the flow path provided in the housing 12. In this embodiment, the sheet 13 comprises a first sheet 131 and a second sheet 132. The first sheet 131 is located on the first outflow flow path 22 side of the internal flow path 11. The second sheet 132 is located on the second outflow flow path 23 side of the internal flow path 11.

[0025] The housing 12 is made of resin. The seat 13 is made of resin, but may be made of rubber. Also, seat 13 is an example of a “valve seat” in this disclosure, the first seat 131 is an example of a “first valve seat” in this disclosure, and the second seat 132 is an example of a “second valve seat” in this disclosure.

[0026] The valve 14 is located in a passage provided in the housing 12 and is connected to the valve shaft 15. It is fixed and contacts and separates from the seat 13. In this embodiment, the valve 14 includes a first valve 141 and a second valve 142. The first valve 141 contacts and separates from the first seat 131 on the internal flow path 11 side. The second valve 142 contacts and separates from the second seat 132 on the internal flow path 11 side.

[0027] Although the valve 14 is formed of resin, it may also be formed of metal. Furthermore, the valve 14 is an example of a "valve body" in this disclosure, the first valve 141 is an example of a "first valve body" in this disclosure, and the second valve 142 is an example of a "second valve body" in this disclosure.

[0028] The valve shaft 15 is located inside the housing 12, and the valve 14 is mounted on it. The valve shaft 15 is located between the actuator 16 and the second valve 142, and is positioned to pass through the assembly hole 24 (see Figure 3) which is formed perpendicularly through the housing 12. The valve shaft 15 is made of resin, but it may also be made of metal.

[0029] In this embodiment, the valve shaft 15 has a valve 14 at one end and a cylindrical portion 31 at the other end in the axial direction of the valve shaft 15. The valve shaft 15 is movable in the thrust direction, which is the central axis direction of the valve shaft 15. Note that the valve shaft 15 is an example of the "valve shaft" of this disclosure.

[0030] Furthermore, the assembly hole 24 is arranged with the valve shaft 15 at its center, and the bearing 17 and the seal structure 18 are positioned within it.

[0031] The actuator 16 is a drive unit that moves the valve shaft 15 in the axial direction. In this embodiment, the actuator 16 is composed of a stepper motor and includes a rotor shaft 41 as an axial rotating shaft that is part of the rotor of the stepper motor and outputs power. This rotor shaft 41 is made of metal, for example, and is located inside the cylindrical portion 31 of the valve shaft 15. A rotor shaft threaded portion 42 (male thread) formed on the outer surface of one end of the rotor shaft 41 in the axial direction is screwed into a cylindrical portion threaded portion 32 (female thread) formed on the inner surface of the cylindrical portion 31 of the valve shaft 15. The rotor shaft threaded portion 42 is an example of the "rotating shaft threaded portion" in this disclosure, and the cylindrical portion threaded portion 32 is an example of the "valve shaft threaded portion" in this disclosure.

[0032] Then, as the rotor shaft 41 of the actuator 16 rotates about its central axis, the valve shaft 15, which has a cylindrical portion 31, moves in the axial direction, causing the valve 14 to come into contact with and separate from the seat 13.

[0033] The bearing 17 is located between the actuator 16 and the seal structure 18, and is provided between the housing 12 and the rotor shaft 41 of the actuator 16, rotatably supporting the rotor shaft 41.

[0034] The seal structure 18 is provided at a position between the internal flow path 11 (valve 14) and the bearing 17, and seals the space between the internal flow path 11 and the bearing 17 (actuator 16). In this embodiment, the seal structure 18 includes a reciprocating seal member 181 and a rotating seal member 182. Details of the seal structure 18 will be described later.

[0035] In this configuration, the water channel switching valve 1 moves the valve shaft 15 in the axial direction of the valve shaft 15 by the actuator 16, thereby achieving the first open state shown in Figure 1 ( The valve can be switched between a fully open state of the first outflow channel 22 and a fully closed state of the second outflow channel 23, as shown in Figure 2, and a second open state of the valve (fully closed state of the first outflow channel 22 and fully open state of the second outflow channel 23).

[0036] In the first open valve state shown in Figure 1, the first valve 141 is spaced apart from the first seat 131, and the second valve 142 is in contact with the second seat 132, and the cooling water introduced from the inlet passage 21 is discharged from the first outlet passage 22. In the second open valve state shown in Figure 2, the first valve 141 is in contact with the first seat 131, and the second valve 142 is spaced apart from the second seat 132, and the cooling water introduced from the inlet passage 21 is discharged from the second outlet passage 23.

[0037] (Regarding the sealing structure) Next, the seal structure 18 will be described.

[0038] In this embodiment, as shown in Figure 3, the seal structure 18 comprises two seal members. Specifically, the seal structure 18 comprises a reciprocating seal member 181 provided on the internal flow path 11 side and a rotating seal member 182 provided on the actuator 16 side. The reciprocating seal member 181 and the rotating seal member 182 are made of, for example, rubber. Furthermore, the reciprocating seal member 181 is an example of the "first seal member" of this disclosure, and the rotating seal member 182 is an example of the "second seal member" of this disclosure.

[0039] The reciprocating seal member 181 is provided between the housing 12 and the cylindrical portion 31 of the valve shaft 15. The rotating seal member 182 is provided between the housing 12 and the rotor shaft 41 of the actuator 16, at a position closer to the actuator 16 than the reciprocating seal member 181 (i.e., on the opposite side from the internal flow path 11, the upper side in Figure 3).

[0040] In this way, the reciprocating seal member 181 seals the space between the flow path of the housing 12 and the actuator 16. This reduces the leakage of coolant from the reciprocating seal member 181 to the actuator 16 side to a seepage level, thereby preventing coolant from entering the actuator 16.

[0041] Furthermore, the reciprocating seal member 181 prevents cooling water and foreign matter from entering the cylindrical threaded portion 32 of the valve shaft 15 and the rotor shaft threaded portion 42 of the actuator 16 from the flow path of the housing 12.

[0042] Furthermore, even if cooling water leaks from the reciprocating seal member 181 to the actuator 16 side, the rotating seal member 182 prevents the cooling water from entering the actuator 16 and bearing 17. In particular, the rotor shaft 41 of the actuator 16, which slides with the rotating seal member 182, rotates without moving in the vertical direction (axial direction of the rotor shaft 41). Therefore, cooling water adhering to the rotor shaft 41 is less likely to leak to the actuator 16 side and bearing 17 side than to the rotating seal member 182.

[0043] Furthermore, in this embodiment, when the actuator 16 that moves the valve 14 is driven, the reciprocating seal member 181 acts as resistance to the movement of the valve shaft 15, making it possible to eliminate backlash (i.e., reduce play) between the cylindrical threaded portion 32 of the valve shaft 15 and the rotor shaft threaded portion 42 of the actuator 16.

[0044] That is, consider the case when the valve 14 descends as shown in Figure 4. At this time, as shown in Figure 5, the sealing tension of the lip 51 of the reciprocating seal member 181 (i.e., the force with which the lip 51 presses against the cylindrical portion 31 of the valve shaft 15) causes the cylindrical portion of the valve shaft 15 to be compressed. As a result, the 31 becomes less likely to descend, and the upper side 82 of the threaded portion 81 of the cylindrical portion 32 is pressed against the lower side 73 of the threaded portion 71 of the rotor shaft threaded portion 42. Therefore, backlash between the cylindrical portion 32 and the rotor shaft threaded portion 42 can be eliminated without the need for a dedicated spring to eliminate backlash. Consequently, the contact state between the cylindrical portion 31 of the valve shaft 15 and the rotor shaft 41 of the actuator 16 can be maintained. Thus, by rotating the rotor shaft 41, the cylindrical portion 31 of the valve shaft 15 can be stably lowered, and the valve 14 can be lowered.

[0045] Subsequently, as shown in Figure 6, when the second valve 142 abuts against the second seat 132 and the second outlet passage 23 becomes fully closed, as shown in Figure 7, the rotor shaft 41 attempts to move upward (towards the opening direction of the second valve 142) due to the stepping out of the actuator 16 (which is composed of a step motor). However, the second valve 142 is pushed downward (towards the closing direction) by the water pressure (i.e., the pressure of the cooling water flowing through the internal passage 11), so the fully closed state of the second outlet passage 23 can be maintained.

[0046] Next, consider the case when the valve 14 rises, as shown in Figure 8. At this time, as shown in Figure 9, the sealing tension of the lip 51 of the reciprocating seal member 181 makes it difficult for the cylindrical portion 31 of the valve shaft 15 to rise, and the lower side 83 of the threaded portion 81 of the cylindrical portion 32 is pressed against the upper side 72 of the threaded portion 71 of the rotor shaft threaded portion 42. Therefore, backlash between the cylindrical portion 32 and the rotor shaft threaded portion 42 can be eliminated without providing a dedicated spring to eliminate backlash. Thus, the contact state between the cylindrical portion 31 of the valve shaft 15 and the rotor shaft 41 of the actuator 16 can be maintained. Therefore, by rotating the rotor shaft 41, the cylindrical portion 31 of the valve shaft 15 can be stably raised, and the valve 14 can be raised.

[0047] Subsequently, as shown in Figure 10, when the first valve 141 abuts against the first seat 131 and the first outflow passage 22 becomes fully closed, as shown in Figure 11, the rotor shaft 41 attempts to move downward (towards the opening direction of the first valve 141) due to the actuator 16 losing step. However, the first valve 141 is pushed upward (towards the closing direction) by the water pressure, so the fully closed state of the first outflow passage 22 can be maintained.

[0048] (Effects of this embodiment) According to this embodiment, in the water channel switching valve 1, a reciprocating sealing member 181 is provided between the housing 12 and the cylindrical portion 31 of the valve shaft 15.

[0049] Since the reciprocating seal member 181 is provided in this manner, it is possible to seal the space between the flow path of the housing 12 and the actuator 16 and bearing 17, thereby preventing the intrusion of cooling water into the actuator 16 and bearing 17.

[0050] Furthermore, when the valve 14 is lowered and raised, the sealing tension of the lip 51 of the reciprocating seal member 181 acts as resistance to the movement of the valve shaft 15. This eliminates the backlash between the cylindrical threaded portion 32 and the rotor shaft threaded portion 42. Therefore, since there is no need to provide a dedicated spring to eliminate the backlash, the backlash between the cylindrical threaded portion 32 and the rotor shaft threaded portion 42 can be eliminated with a simple configuration.

[0051] Furthermore, the reciprocating seal member 181 prevents foreign matter from entering the threaded portion (the cylindrical threaded portion 32 of the valve shaft 15 or the rotor shaft threaded portion 42 of the actuator 16) from the flow path.

[0052] Furthermore, the sealing force of the reciprocating sealing member 181 can also suppress eccentricity of the cylindrical portion 31 of the valve shaft 15 and the rotor shaft 41 of the actuator 16 caused by play in the threaded portion.

[0053] Furthermore, in the water channel switching valve 1, a rotating part seal member 182 is provided between the housing 12 and the rotor shaft 41 of the actuator 16, at a position closer to the actuator 16 than the reciprocating part seal member 181.

[0054] The presence of the rotating part sealing member 182 allows for a seal between the reciprocating part sealing member 181 and the actuator 16 and bearing 17. This prevents coolant leaking from between the lip 51 of the reciprocating part sealing member 181 and the cylindrical portion 31 of the valve shaft 15 from entering the actuator 16 and bearing 17.

[0055] Furthermore, the rotor shaft 41 of the actuator 16 that slides against the rotating seal member 182 rotates around its central axis and does not move in the axial direction. Therefore, leakage (seepage) of cooling water from the rotating seal member 182 to the actuator 16 and bearing 17 due to the driving of the rotor shaft 41 is unlikely to occur.

[0056] Furthermore, the water channel switching valve 1 of this embodiment includes a first valve 141 that contacts and separates from the first seat 131 on the internal flow path 11 side, and a second valve 142 that contacts and separates from the second seat 132 on the internal flow path 11 side.

[0057] As a result, even if the step motor constituting the actuator 16 loses step when the first outflow passage 22 or the second outflow passage 23 is fully closed, the first valve 141 and the second valve 142 are pushed by the water pressure, maintaining the first outflow passage 22 and the second outflow passage 23 in a fully closed state.

[0058] Thus, the water channel switching valve 1 of this embodiment can prevent cooling water from entering the actuator 16 and can also bias the valve 14 using the water pressure of the cooling water.

[0059] <Second Embodiment> Next, we will explain the differences between the second embodiment and the first embodiment, and omit the explanation of the points that are common to both embodiments.

[0060] In this embodiment, the first valve 141 contacts and separates from the first seat 131 on the side of the first outflow passage 22. The second valve 142 contacts and separates from the second seat 132 on the side of the second outflow passage 23. Furthermore, the first seat 131 is provided with a first rubber sheet member 133 as an elastic member, and the second seat 132 is provided with a second rubber sheet member 134 as an elastic member.

[0061] In this embodiment as well, when the actuator 16 that moves the valve 14 is driven, the reciprocating seal member 181 acts as resistance to the movement of the valve shaft 15, making it possible to eliminate backlash between the cylindrical threaded portion 32 of the valve shaft 15 and the rotor shaft threaded portion 42 of the actuator 16.

[0062] That is, consider the case when the valve 14 descends, as shown in Figure 12. At this time, as in the first embodiment, as shown in Figure 5, the sealing tension of the lip 51 of the reciprocating seal member 181 can eliminate the backlash between the cylindrical screw portion 32 and the rotor shaft screw portion 42, and the contact state between the cylindrical portion 31 of the valve shaft 15 and the rotor shaft 41 can be maintained.

[0063] Then, as shown in Figure 13, when the first valve 141 abuts against the first seat 131 and the first outflow passage 22 is fully closed, as shown in Figure 14, the rotor shaft 41 attempts to move upward (towards the opening direction of the first valve 141) due to the actuator 16 losing step. However, although the first valve 142 is also pushed upward by the reaction force (elastic force) of the first rubber seat member 133, its upward movement is suppressed by the rotor shaft screw portion 42 (even when water pressure is applied, the movement is suppressed), so the first valve 141 maintains contact with the first rubber seat member 133 due to the elastic force of the first rubber seat member 133, and the fully closed state of the first outflow passage 22 can be maintained.

[0064] Next, consider the case when the valve 14 rises, as shown in Figure 15. At this time, as in the first embodiment, as shown in Figure 9, the sealing tension of the lip 51 of the reciprocating seal member 181 can eliminate the backlash between the cylindrical screw portion 32 and the rotor shaft screw portion 42, and the contact state between the cylindrical portion 31 of the valve shaft 15 and the rotor shaft 41 can be maintained.

[0065] Then, as shown in Figure 16, when the second valve 142 abuts against the second seat 132 and the second outflow passage 23 becomes fully closed, as shown in Figure 17, the rotor shaft 41 attempts to move downward (towards the direction in which the second valve 142 opens) due to the actuator 16 losing step. However, although the second valve 142 is also pushed downward by the reaction force (elastic force) of the second rubber seat member 134, its downward movement is suppressed by the rotor shaft screw portion 42 (even when water pressure is applied, the movement is suppressed), and the elastic force of the second rubber seat member 134 keeps the second valve 142 in contact with the second rubber seat member 134, thus maintaining the fully closed state of the second outflow passage 23.

[0066] The water channel switching valve 1 of this embodiment includes a first valve 141 that contacts and separates from the first outflow channel 22 side with respect to the first seat 131, and a second valve 142 that contacts and separates from the second outflow channel 23 side with respect to the second seat 132. A first rubber sheet member 133 and a second rubber sheet member 134 are provided on the first seat 131 and the second seat 132, respectively.

[0067] As a result, even if the step motor constituting the actuator 16 loses step when the first outflow channel 22 or the second outflow channel 23 is fully closed, the elastic force of the first rubber sheet member 133 and the second rubber sheet member 134 will follow, allowing the first outflow channel 22 and the second outflow channel 23 to be maintained in a fully closed state.

[0068] It should be noted that the embodiments described above are merely illustrative examples and do not limit this disclosure in any way. Various improvements and modifications are possible without departing from the gist of the disclosure.

[0069] For example, the contents of this disclosure can also be applied when the water channel switching valve 1 is a two-way valve.

[0070] Alternatively, for example, the rotor shaft 41 may have a cylindrical portion at one end in its axial direction, with the valve shaft 15 positioned inside the cylindrical portion, and the threaded portion (female thread) formed on the inner surface of the cylindrical portion of the rotor shaft 41 and the threaded portion (male thread) formed on the outer surface of the valve shaft 15 may be screwed together. In this case, a reciprocating seal member 181 is provided between the non-threaded portion of the valve shaft 15 and the housing 12. [Explanation of symbols]

[0071] 1. Hydrogen switching valve 11 Internal flow channels 12 Housing 13 seats 131 Sheet 1 132 Seat 2 133 First rubber sheet member 134 Second rubber sheet member 14 valves 141 Valve No. 1 142 Second valve 15 Valve shaft 16 Actuators 18. Seal structure 181 Reciprocating seal member 182 Rotating part sealing member 21 Inflow channel 22. First Outflow Channel 23. Second Outflow Channel 31 Cylindrical part 32 Cylindrical part Screw part 41 Rotor shaft 42 Rotor shaft threaded section

Claims

1. A housing equipped with a flow path, A valve seat provided in the aforementioned flow path, A valve body that contacts and separates from the valve seat, A valve stem disposed inside the housing and on which the valve body is provided, An actuator that moves the valve stem in the axial direction of the valve stem, In a valve device having, The valve stem has the valve body provided at one end and a valve stem threaded portion at the other end, in the axial direction of the valve stem. The actuator is equipped with an axial rotating shaft, The aforementioned rotating shaft is provided with a rotating shaft screw portion at one end in the axial direction of the rotating shaft, The valve stem threaded portion and the rotating shaft threaded portion are screwed together. The rotation of the rotating shaft causes the valve stem to move in the axial direction of the valve stem, so that the valve body comes into contact with and separates from the valve seat. A first sealing member is provided between the housing and the valve shaft. A second seal member is provided between the housing and the rotating shaft at a position closer to the actuator than the first seal member. A valve device characterized by the following.

2. In the valve device of claim 1, The valve device is a three-way valve having, as the flow path, an internal flow path, an inflow flow path for introducing fluid into the internal flow path, a first outflow flow path for releasing the fluid from the internal flow path and provided on the actuator side relative to the internal flow path, and a second outflow flow path for releasing the fluid from the internal flow path and provided on the opposite side of the actuator relative to the internal flow path. The valve seat comprises a first valve seat located on the first outflow channel side of the internal flow path, and a second valve seat located on the second outflow channel side of the internal flow path. The valve body comprises a first valve body that contacts and separates from the first valve seat on the internal flow path side, and a second valve body that contacts and separates from the second valve seat on the internal flow path side. A valve device characterized by the following.

3. In the valve device of claim 1, The valve device is a three-way valve having, as the flow path, an internal flow path, an inflow flow path for introducing fluid into the internal flow path, a first outflow flow path for releasing the fluid from the internal flow path and provided on the actuator side relative to the internal flow path, and a second outflow flow path for releasing the fluid from the internal flow path and provided on the opposite side of the actuator relative to the internal flow path. The valve seat comprises a first valve seat located on the first outflow channel side of the internal flow path, and a second valve seat located on the second outflow channel side of the internal flow path. The valve body comprises a first valve body that abuts against and separates from the first valve seat on the first outflow passage side, and a second valve body that abuts against and separates from the second valve seat on the second outflow passage side. The first valve seat and the second valve seat are each provided with an elastic member. A valve device characterized by the following.

4. In any one of claims 1 to 3, The valve device is a water channel switching valve that switches the flow path of water. A valve device characterized by the following.

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