JP2017115988A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device which can be reduced in the size of the whole device and prevent operation abnormality caused by movement of the other end of a spring member.SOLUTION: The other end 43 of a spring member 4 is held in a state of being compressively deformed from a free state by an other end holding part 23 of a valve housing 2, so that large holding power can be obtained by restoring force caused in the spring member 4. Accordingly, even when a flow rate of fluid becomes excessive, the other end 43 is hardly moved, and operation abnormality of a valve device 1A can be prevented. At this time, there is no need to increase the diameter of the other end 43, and the valve device 1A can be reduced in size in its entirety.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a valve device including a valve housing, a valve body, and a spring member.

  Conventionally, a valve device including a valve housing, a valve body, and a compression coil spring (spring member) that urges the valve body has been proposed (see, for example, Patent Document 1). In the valve device described in Patent Document 1, the valve body is closed by a pressure difference generated between the front and rear sides (upper surface side and lower surface side), and the valve body is urged in the valve opening direction by a compression coil spring. When the valve closing force due to the difference is reduced, the valve is opened by the restoring force of the compression coil spring.

  The compression coil spring is disposed on the fluid flow path in the valve housing, and is held by the reverse tapered shaft-shaped portion of the valve body, thereby preventing the valve body from falling off when the fluid flows. ing. Moreover, the diameter of the compression coil spring is increased as the distance from the valve body increases.

JP 2003-269504 A

  In the valve device of Patent Document 1, since the compression coil spring is disposed on the fluid flow path, the fluid flow may cause a collapse or deformation. For example, if the flow rate of the fluid becomes excessive, a part of the compression coil spring may be fitted into the opening (valve port) of the valve seat, and the valve device may not operate normally. was there. In order to eliminate the abnormal operation of the valve device due to the movement of the compression coil spring in this way, the diameter of the end of the compression coil spring opposite to the valve body (the other end) is sufficiently large with respect to the valve port. Although it is possible to cope with this, the overall size of the apparatus is increased. Although it is possible to prevent the compression coil spring from being disposed on the fluid flow path (see FIG. 5 of Patent Document 1), in this case as well, the full length of the device (the dimension along the axial direction of the compression coil spring) is also conceivable. ) Becomes longer, that is, larger.

  The objective of this invention is providing the valve apparatus which can suppress the operation | movement abnormality by moving the other end part of a spring member while reducing the whole apparatus in size.

  In order to solve the above-mentioned problems and achieve the object, the invention described in claim 1 is a valve housing having a valve seat, and a valve which operates so as to be in contact with and away from the valve seat and is seated and separated. And a spring member that is disposed on the fluid flow path inside the valve housing and biases the valve body toward the valve opening side in the operation direction. One end connected to the valve body, a spring main body extending from the one end toward the valve seat, and the other end connected to the valve housing. And the other end portion is expanded or contracted in diameter relative to the spring main body portion in a free state, and the valve housing is held in a state where the other end portion is compressed and deformed from the free state. The other end holding part is a valve device characterized by

  The invention described in claim 2 is the invention described in claim 1, wherein the other end portion is formed in a truncated cone shape in a free state by a plurality of continuous annular portions, and the other end holding portion is The other end portion is configured to be sandwiched from both sides in the operation direction so that the plurality of annular portions at the other end portion are arranged in the radial direction.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the valve body has one end holding portion for holding the one end portion.

  The invention described in claim 4 is the invention according to any one of claims 1 to 3, wherein the spring main body part and the other end part have a truncated cone shape as a whole with the one end part side as a small diameter side. The other end portion has a larger inclination angle with respect to the operation direction than the spring main body portion.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the valve housing houses a housing body having the valve seat, the valve body, and the housing body. A cylindrical plug member attached to the plug member, a distal end portion of the plug member on the other end side in the operation direction, and a facing portion of the housing body that faces the distal end portion in the operation direction. The other end holding part is constituted by the above-mentioned.

  According to the first aspect of the present invention, the other end portion of the spring member is held in a state of being compressed and deformed from the free state by the other end holding portion of the valve housing, so that the restoring force generated in the spring member is A large holding force can be obtained. Therefore, even when the flow rate of the fluid becomes excessive, the other end portion of the spring member is difficult to move, and an abnormal operation of the valve device can be suppressed. At this time, it is not necessary to increase the diameter of the other end, and the entire apparatus can be reduced in size.

  According to the invention described in claim 2, the other end portion is clamped from the operation direction by the other end holding portion so that the plurality of annular portions are arranged in the radial direction, thereby further strengthening the other end portion. It can hold | maintain and can suppress further abnormal operation of a valve device. Since the spring member is spiral, a closed ring portion is not formed, but a reference position is defined in the circumferential direction, and one round from the reference position is called an annular portion.

  According to the third aspect of the invention, the one end portion of the spring member is held by the one end holding portion of the valve body, so that the one end portion is prevented from dropping from the valve body, and the valve device malfunctions. Further suppression can be achieved.

  According to the invention described in claim 4, the spring main body portion is formed in the shape of a truncated cone, so that deformation due to an external force along the radial direction can be suppressed. In addition, the other end holding portion can be disposed outside the truncated cone of the spring main body portion so that the other end portion can be easily held because the inclination angle of the other end portion is larger than the inclination angle of the spring main body portion. Can do.

  According to the fifth aspect of the present invention, the other end holding portion is configured by the tip portion of the plug member and the facing portion of the housing body, so that the other end can be easily attached by attaching the plug member to the housing body. Part can be held. That is, when the plug member containing the valve body is attached to the housing body, if the other end portion is sandwiched between the opposite end portion by the tip end portion of the plug member, the other end portion can be easily attached by the other end holding portion. Can be held.

It is sectional drawing which shows the valve apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the said valve apparatus. It is sectional drawing which shows the spring member of the said valve apparatus. It is sectional drawing which shows the mode before the compression of the other end part of the said spring member, and the state after compression. It is sectional drawing which shows the valve apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the principal part of the said valve apparatus. It is sectional drawing which shows the principal part of the valve apparatus of a modification. It is sectional drawing which shows the other end part of the spring member in the valve apparatus of another modification.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 A of valve apparatuses of this embodiment are pilot type solenoid valves, Comprising: As shown in FIG. 1, the valve housing 2, the main valve body 3 as a valve body, the spring member 4, the electromagnetic coil apparatus 5, Is provided. 1 A of valve apparatuses are provided in the flow path through which a refrigerant | coolant (fluid) passes, for example in an air conditioner. In the present embodiment, the operation direction of the main valve body 3 is the Z direction, the inflow and outflow directions of the fluid are the X direction, and the direction substantially perpendicular to the Z direction and the X direction is the Y direction. Further, the valve device 1A is configured to open when the main valve body 3 moves upward in FIG. 1, and closes when the main valve body 3 moves downward. In the following, the upper side of FIG. The open side is called the lower side, and the lower side is called the valve closing side.

  The valve housing 2 includes a cylindrical housing main body 21 extending in the X direction, and a plug member 22 connected substantially perpendicularly to a substantially central portion in the longitudinal direction of the housing main body 21.

  The housing body 21 is connected to the right inflow port 211 in FIG. 1, the inflow passage 212 connected to the inflow port 211, the left outflow port 213, the outflow passage 214 connected to the outflow port 213, and the outflow passage 214. A valve port 215 extending along the Z direction so as to be separated from the passage 212 and opening to the valve opening side, a valve seat 216 formed at the end of the valve port 215, and a plug for holding the plug member 22 Holding part 217.

  The plug member 22 is formed in a cylindrical shape extending in the Z direction, and is partitioned into a primary valve chamber 221 and a back pressure chamber 222 by accommodating the main valve body 3, and is attached to the housing main body 21 by a plug holding portion 217. Caulking is fixed and attached. Of the space inside the plug member 22, the Z-direction valve closing side with respect to the main valve body 3 becomes the primary side valve chamber 221, and the valve opening side becomes the back pressure chamber 222.

  The primary side valve chamber 221 always communicates with the inflow passage 212 and communicates with the valve port 215 when the main valve body 3 is opened. Further, a gap is formed between the inner peripheral surface of the plug member 22 and the main valve body 3, and the back pressure chamber 222 communicates with the primary side valve chamber 221. Therefore, the back pressure chamber 222 communicates with the inflow passage 212.

  2, the stopper surface 217A facing the Z-direction valve opening side is formed on the inner peripheral surface of the plug holding portion 217, and the stopper surface 22A facing the Z-direction valve closing side is formed on the plug member 22. The stopper members 217 </ b> A and 22 </ b> A are in contact with each other so that the plug member 22 does not enter the Z-direction valve closing side with respect to the housing body 21.

  When the stopper surfaces 217A and 22A come into contact with each other in this way, the distal end portion 223 of the plug member 22 on the Z-direction valve closing side opposes the portion around the valve seat 216 (opposing portion 218) in the housing body 21 in the Z direction. In addition, the tip portion 223 and the facing portion 218 are separated from each other. The other end 43 (to be described later) of the spring member 4 is arranged and held between the tip 223 and the facing portion 218, and the tip 223 and the facing portion 218 constitute the other end holding portion 23. To do. That is, the other end holding portion 23 is provided at a position where the other end portion 43 is sandwiched from both sides in the Z direction. The distance G between the tip 223 and the facing portion 218 is substantially equal to the diameter of the wire constituting the spring member 4, and the width (diameter dimension) of the tip 223 is three times the diameter of the wire (the other end). 43).

  The main valve body 3 includes a columnar valve body 31 whose axial direction is the Z direction, and an outer cylindrical body 32 that is formed in a cylindrical shape and into which the valve body 31 is press-fitted. Housed inside.

  A pilot passage 311 extending along the axial direction and penetrating from the upper surface (the valve opening side surface) to the lower surface (the valve closing side surface) is formed at a substantially central portion of the valve body 31. Further, when the lower surface of the valve body 31 contacts the valve seat 216, the main valve body 3 is seated on the valve seat 216, and when the lower surface of the valve body 31 is separated from the valve seat 216, the main valve body 3 is moved to the valve seat 216. Get away from 216.

  The outer cylinder 32 is provided such that an outer peripheral surface thereof slides with respect to an inner peripheral surface of the plug member 22 on the valve opening side, and an end holding portion 321 that holds an end portion 41 (to be described later) of the spring member 4 is provided as a valve. It is formed on the closed side. The one-end holding portion 321 includes a small-diameter groove portion 321A and a large-diameter engaging portion 321B formed on the valve closing side of the groove portion 321A, and has a constricted shape.

  The main valve body 3 has a valve closing force due to the pressure difference between the front and rear (upper surface side and lower surface side), the weight of each part (the main valve body 3 itself and a plunger 52 described later), the elastic force of the plunger spring 53 described later, and the like. In order to resist this, the spring member 4 urges the valve to open.

  As shown in FIG. 3, the spring member 4 has one end connected to the main valve body 3 in order from the valve opening side by winding a metal wire in a spiral shape with the Z direction as an axial direction. 41, a spring main body 42 extending from the one end 41 toward the valve seat 216, and the other end 43 connected to the valve seat 216 side (valve closing side) rather than the main valve body 3 in the valve housing 2. Have. The spring member 4 can be regarded as being formed by a plurality of continuous annular portions. 3 shows the spring member 4 in a free state, and FIGS. 1 and 2 show the spring member 4 deformed from the free state.

  The one end portion 41 is, for example, an end turn formed on one end side of the spring member 4, and is constituted by about three turns (about three annular portions) that are in contact with or close to each other in the axial direction. It is formed in a cylindrical shape with the Z direction as the axial direction. By providing the annular portion constituting the one end portion 41 in the groove portion 321A of the main valve body 3, the annular portion is locked by the locking portion 321B and the movement toward the valve closing side is restricted, and the one end portion 41 is held by one end holding portion 321.

  The spring body 42 is, for example, a portion of the spring member 4 that is compressed and biases the main valve body 3, and is constituted by about 5 turns (about 5 ring portions) spaced apart from each other in the axial direction. In a free state, it is formed in a truncated cone shape with the Z direction as the axial direction and the valve opening side as the small diameter side. The number of turns of the spring body 42 is the effective number of turns of the spring member 4. The inclination angle θ1 of the spring body 42 with respect to the Z direction is about 25 to 35 °. Since the annular portions constituting the spring main body 42 are spaced apart in the axial direction, a restoring force that tends to extend in the axial direction is generated in the spring main body 42 compressed in the axial direction.

  The other end 43 is, for example, an end turn formed on the other end of the spring member 4 and is constituted by about three turns (about three ring portions) that are in contact with or close to each other in the axial direction. In the state, it is formed in a truncated cone shape having the Z direction as the axial direction and the valve opening side as the small diameter side. The inclination angle θ2 of the other end 43 with respect to the Z direction is about 40 to 50 °. Therefore, the inclination angles θ1 and θ2 with respect to the Z direction of the spring main body portion 42 and the other end portion 43 have a relationship of θ1 <θ2. The number of turns of the one end portion 41, the spring main body portion 42, and the other end portion 43 is not limited to the above number, and may be set as appropriate according to the wire diameter of the wire, the pressure of the fluid to be controlled, and the like.

  The height H of the other end portion 43 in the free state is larger than the gap G between the tip end portion 223 and the facing portion 218 constituting the other end holding portion 23. Furthermore, as shown to FIG. 4 (A), each annular part 431-433 which comprises the other end part 43 has an internal diameter substantially equal to the outer diameter of the annular part adjacent to a valve opening side, respectively. That is, when the other end portion 43 is viewed from the Z direction, the inner periphery and the outer periphery of the adjacent annular portions overlap. 4 shows a state of the other end portion 43 on the X direction entrance side, the other end portion 43 has substantially the same configuration in other circumferential positions except for the end portion of the wire. ing.

  Since the gap G between the distal end portion 223 and the facing portion 218 is smaller than the height H of the other end portion 43, the other end holding portion 23 holds the other end portion 43 in a state of being compressed and deformed from the free state. . Further, since the gap G is substantially equal to the wire diameter of the wire member of the spring member 4, the annular portions 431 to 433 are arranged in the radial direction, and the other end portion 43 is sandwiched from the Z direction by the other end holding portion 23. That is, the other end 43 abuts on both the tip 223 and the facing portion 218.

  The spring member 4 as described above is connected to the main valve body 3 and the valve housing 2. In a state where the main valve body 3 is separated from the valve seat 216, the spring member 4 is slightly compressed from the free state and can be further compressed. When the valve is closed, the spring member 4 is further compressed, and the main valve body is restored by a restoring force. 3 is biased toward the valve opening side.

  The electromagnetic coil device 5 forms a back pressure chamber 222 of the main valve body 3 and has a cylindrical portion 51 whose axial direction is the Z direction, a plunger 52 accommodated in the cylindrical portion 51, and a plunger 52 attached to the valve closing side. It has a plunger spring 53 that is energized, a coil 54 that is disposed outside the cylindrical portion 51 and moves the plunger 52 to the valve opening side, and a suction element 55 that is disposed on the valve opening side of the plunger 52.

  A ball valve 521 as a pilot valve is provided at the tip (end on the valve closing side) of the plunger 52. When the plunger 52 moves to the valve closing side, the opening of the pilot passage 311 formed in the main valve body 3 is closed by the ball valve 521.

  Here, a procedure for attaching the plug member 22 to the housing body 21 will be described. First, one end 41 of the spring member 4 is connected to the main valve body 3, and the main valve body 3 is accommodated in the plug member 22. At this time, the other end portion 43 of the spring member 4 is overlapped with the tip end portion 223 of the plug member 22 in the Z direction. Such a plug member 22 is made to approach the housing main body 21 in the Z direction, and the other end portion 43 is disposed between the tip end portion 223 and the facing portion 218 of the housing main body 21, and is compressed and deformed as described above. Thereafter, the plug member 22 is caulked and brazed by the plug holding portion 217 of the housing body 21, and the attachment is completed. By brazing, the inside of the valve is secured and the plug member 22 is lifted or the spring member 4 is moved by the restoring force of the other end 43 to the valve opening side. It is suppressed.

  Hereinafter, valve opening and valve closing operations of the entire valve device 1A will be described. First, when the coil 54 is off, the plunger 52 is moved to the valve closing side by the plunger spring 53, whereby the pilot passage 311 of the main valve body 3 is closed and the main valve body 3 is moved to the spring member 4. The valve device 1A is moved to the valve closing side against the elastic force and seated on the valve seat 216, and the valve device 1A enters the valve closed state.

  At this time, the outflow passage 214 is partitioned from the primary valve chamber 221 by the main valve body 3 and from the back pressure chamber 222 by the ball valve 521. The primary valve chamber 221 and the back pressure chamber 222 have substantially the same pressure as the inflow passage 212, and the inflow passage 212 is higher in pressure than the outflow passage 214 and the valve port 215. Receive the power to.

  In such a valve closed state, the coil 54 is turned on, and the plunger 52 and the attractor 55 are attracted to each other by magnetic force, so that the ball valve 521 is separated from the upper surface of the main valve body 3 when the plunger 52 moves to the valve opening side. The pilot passage 311 is opened to the back pressure chamber 222. As a result, the pressure in the back pressure chamber 222 decreases and becomes substantially equal to the pressure in the outflow passage 214. The force applied to the upper surface of the main valve body 3 becomes equal to or smaller than the force applied to the lower surface, and the main valve body 3 is moved to the valve opening side by the restoring force of the spring member 4 and is separated from the valve seat 216, 1 A of valve apparatuses will be in a valve open state as shown in FIG.

  As a result, the inflow passage 212 communicates with the outflow passage 214 via the primary valve chamber 221 and the valve port 215, and fluid can flow from the inflow port 211 to the outflow port 213. At this time, the spring member 4 is disposed on the fluid flow path inside the valve housing 2.

  According to this embodiment, there are the following effects. That is, the other end portion 43 of the spring member 4 is held in a state of being compressed and deformed from the free state by the other end holding portion 23 of the valve housing 2, thereby obtaining a large holding force by the restoring force generated in the spring member 4. be able to. Therefore, even when the flow rate of the fluid becomes excessive, the other end portion 43 becomes difficult to move, and an abnormal operation of the valve device 1A can be suppressed. At this time, it is not necessary to increase the diameter of the other end portion 43, and the entire valve device 1A can be reduced in size.

  Also, the one end 41 of the spring member 4 is held by the one end holding portion 321 of the main valve body 3, so that the one end 41 is prevented from dropping from the main valve body 3, and the operation abnormality of the main valve body 3 is prevented. Further suppression can be achieved.

  Further, since the stopper surface 217A of the housing main body 21 and the stopper surface 22A of the plug member 22 are configured to contact each other, the plug member 22 is assembled to the housing main body 21 so that the stopper surfaces contact each other. These relative position shifts can be suppressed. Moreover, when the other end part 43 is not normally hold | maintained by the other end holding part 23, it is hard to contact | abut stopper surfaces, and an operator is easy to notice an assembly | attachment defect. Further, since the displacement of the relative position between the housing main body 21 and the plug member 22 is suppressed in this way, the variation in the valve opening force that the spring member 4 applies to the main valve body 3 can be suppressed.

  Further, since the spring main body 42 is formed in a truncated cone shape, deformation due to an external force along the radial direction can be suppressed. Furthermore, since the inclination angle θ2 of the other end portion 43 is larger than the inclination angle θ1 of the spring main body portion 42, the other end holding portion 23 can be disposed outside the truncated cone of the spring main body portion 42. 43 can be easily held.

  Furthermore, since the other end holding portion 23 is configured by the tip portion 223 of the plug member 22 and the facing portion 218 of the housing body 21, the other end portion 43 can be easily attached by attaching the plug member 22 to the housing body 21. Can be retained.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The valve device 1B of the present embodiment is a pilot-type electromagnetic valve, and as shown in FIG. 5, a valve housing 6, a main valve body 3B as a valve body, a spring member 7, an electromagnetic coil device 5, Is provided. In the present embodiment, the operation direction of the main valve body 3B is the Z direction, and the directions substantially orthogonal to the Z direction are the X direction and the Y direction. Further, the valve device 1B is configured to open when the main valve body 3B moves upward in FIG. 5 and closes when the main valve body 3B moves downward. In the following, the upper side of FIG. The open side is called the lower side, and the lower side is called the valve closing side.

  The valve housing 6 includes a cylindrical housing main body 61 that extends in the Z direction and has a valve seat 611, an inflow pipe member 62 that extends in the X direction to form an inflow passage and is connected to the housing main body 61, and An outflow pipe member 63 that extends to form an outflow passage and is connected to the housing body 61, and a ring member 64 that is attached to the housing body 61.

  As shown in FIG. 6, the ring member 64 is formed in an annular shape so as to hold the other end 73 described later of the spring member 7, and in the Z direction with respect to the facing surface 612 in the housing body 61. Opposite and spaced apart, fixed to the housing body 61. The ring member 64 is press-fitted and fixed to the outer periphery of the cylindrical portion 613 constituting the valve seat 611 in the housing body 61. At this time, the ring member 64 is positioned in the Z direction by causing the upper surface of the ring member 64 and the upper surface of the cylindrical portion 613 to coincide (become the same height). The other end holding portion 65 is configured by the ring members 64 and the opposing surfaces 612 disposed on both sides in the Z direction with respect to the other end portion 73, and the other end portion 73 is held by the other end holding portion 65.

  In the valve device 1B of the present embodiment, the main valve body 3B is accommodated in the housing main body 61, and the electromagnetic coil device 5 is directly connected to the housing main body 61 without a plug member. Moreover, the main valve body 3B is not provided with an outer cylinder body, but is constituted only by a valve main body, and the outer peripheral surface includes a portion that slides with respect to the inner peripheral surface of the housing main body 61, and the main valve of the first embodiment. An end holding portion similar to the body 3 is formed.

  As shown in FIG. 6, the spring member 7 has a cylindrical one end 71 connected to the main valve body 3 </ b> B, a cylindrical spring main body 72, and a valve closed more than the main valve body 3 </ b> B in the valve housing 6. And the other end 73 connected to the side (the valve seat 611 side).

  In the free state, the other end portion 73 is reduced in diameter with respect to the one end portion 71 and the spring main body portion 72 and has an inclination such that the diameter decreases toward the Z-direction valve closing side, and the valve closing side has a small diameter. It is formed in a truncated cone shape on the side. That is, the ring member 64 for holding the other end 73 is disposed inside the spring member 7. In addition, the other end portion 73 disposed between the ring member 64 and the facing surface 612 has an annular portion aligned in the radial direction, like the other end portion 43 of the spring member 4 of the first embodiment. Compressed.

  According to this embodiment, the same effect as the first embodiment can be obtained. Furthermore, the other end portion 73 of the spring member 7 has a smaller diameter than the spring main body portion 72, and the ring member 64 is disposed inside the spring member 7, so that the space inside the spring member 7 is effectively used. Can do. Furthermore, the overall length (Z-direction dimension) of the valve device 1B can be shortened compared to a configuration in which the spring member is not disposed on the fluid flow path.

  In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.

  For example, in the first and second embodiments, the distal end portion 223 of the cylindrical plug member 22 and the annular ring member 64 constitute the other end holding portion, and the other end portion of the spring member over the entire circumferential direction. However, the other end holding portion may be any member as long as it has a sufficient holding force against the fluid flow, and may not hold the other end portion in the entire circumferential direction.

  For example, as shown in FIG. 7, instead of the ring member 64 of the second embodiment, a pressing member 66 having a C-shape in the Z direction may be used. At this time, a counterbore groove 614 is formed on the inner peripheral surface of the housing body 61, so that the pressing member 66 is fitted and fixed. That is, the outer peripheral portion of the pressing member 66 is held. Further, the pressing member 66 is positioned in the Z direction by the upper surface thereof coming into contact with the lower surface of the counterbored groove 614. The method of fixing the ring member and the pressing member to the housing body is not limited to the press-fitting as in the second embodiment or the fitting into the groove as described above, but is moved by the restoring force of the other end of the spring member. Any method can be used as long as the fixing force can be obtained.

  In the first and second embodiments, the one end holding portion for holding one end portion of the spring member is provided on the main valve body. For example, when the axial dimension of one end portion is large, the main valve body When one end is difficult to drop off from the main valve body, such as when one end is greatly elastically deformed at the time of connection to obtain a large holding force by restoring force, or, for example, one end is not placed on the fluid flow path When the relative position between the one end portion and the main valve body is difficult to shift, the one end portion may be connected to the main valve body without providing the one end holding portion. The “connection” here is a concept that includes a configuration that is not fixed to each other, and it is sufficient that one end is in contact with and presses against a specific position of the main valve body. For example, the positioning valve | bulb etc. may be formed in the lower surface of a main valve body, and the structure by which one end part is connected to a main valve body may be simply located in this groove part.

  In the first embodiment, the plurality of annular portions 431 to 433 forming the other end portion 43 of the spring member 4 overlap each other when viewed from the Z direction. When a sufficient holding force is obtained by the holding portion, these annular portions do not have to overlap.

  In the first and second embodiments, the other end holding portion sandwiches the other end portion, and the plurality of annular portions at the other end portion are arranged in the radial direction. It is not necessary to sandwich the portion, and it is sufficient if it is held at least from the valve opening side in contact with the other end portion. Furthermore, when the other end portion is held, the plurality of annular portions may not be arranged in the radial direction, and the other end portion having only one annular portion may be held.

  Moreover, in the said 1st Embodiment, each annular part 431-433 which comprises the other end part 43 of the spring member 4 shall have an internal diameter substantially equal to the outer diameter of the annular part adjacent to a valve opening side, respectively. However, the relationship between the inner diameter and the outer diameter between adjacent annular portions may be set as appropriate. That is, each annular part has an inner diameter smaller than the outer diameter of the annular part adjacent to the valve opening side, so that the annular parts may overlap each other when viewed from the Z direction. The annular portions may be separated from each other when viewed from the Z direction by having an inner diameter larger than the outer diameter of the annular portion adjacent to the valve opening side.

  Here, a configuration in which the annular portions 431 to 433 overlap with each other when viewed from the Z direction is illustrated in FIG. 8. In the free state, as shown in FIG. 8A, the other end portion 43 is smaller in inner diameter DI2 of the second annular portion 432 from the valve opening side than the outer diameter DO1 of the first annular portion 431. The inner diameter DI3 of the second annular portion 433 is smaller than the outer diameter DO2 of the second annular portion 432, and adjacent annular portions 431 to 433 overlap each other when viewed from the Z direction.

  When such other end portion 43 is held by the other end holding portion, as shown in FIG. 8B, the other end portion 43 is compressed in the Z direction from the free state, and the ring portions 431 to 433 are reduced in diameter. Line up in the direction. At this time, in the other end portion 43 in the free state, the annular portions 431 to 433 overlap each other when viewed from the Z direction, and in the deformed other end portion 43, the annular portions 431 to 433 are adjacent to each other. , The diameter is enlarged or reduced, and the adjacent annular portions 431 to 433 are pressed against each other in the radial direction by the restoring force.

  In the illustrated example, for the sake of simplicity, the second annular portion 432 located in the center is hardly displaced from the free state, and the first annular portion 431 located on the outlet side (inner side) is moved from the free state to the outlet side. Further, the third annular portion 433 that is displaced to the valve closing side and located on the inlet side (outside) is displaced from the free state to the inlet side and the valve opening side. At this time, the first annular portion 431 is pressed against the tip portion 223 positioned on the valve opening side by the restoring force in the Z direction, and the third annular portion 433 is positioned on the valve closing side by the restoring force in the Z direction. Is pressed against the opposing portion 218. Since the gap G between the tip portion 223 and the facing portion 218 is larger than the diameter of the wire member of the spring member 4, the annular portions 431 to 433 are shifted from each other in the Z direction.

  Further, the first annular portion 431 and the third annular portion 433 are pressed against the second annular portion 432 by the restoring force in the radial direction. At this time, since the first annular portion 431 is displaced to the valve opening side from the annular portion 432, the first annular portion 431 is further pressed against the distal end portion 223 by the reaction force received by the second annular portion 432. Similarly, the third annular portion 433 is further pressed against the facing portion 218 by the reaction force received by the second annular portion 432. Therefore, compared with the case where the other end portion having the annular portion that does not overlap in the Z direction is compressed, the annular portions 431 and 433 are pressed more strongly against the other end holding portion 23 to increase the holding force. Can do.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A, 1B Valve device 2, 6 Valve housing 21 Housing body 22 Plug member 218 Opposing portion 223 Tip portion 3, 3B Main valve element (valve element)
4, 7 Spring member 23, 65 Other end holding portion 321 One end holding portion 41, 71 One end portion 42, 72 Spring body portion 43, 73 Other end portion 431-433 Annular portion

Claims (5)

A valve housing having a valve seat;
A valve body that operates so as to contact and separate from the valve seat, and seats and separates;
A spring member disposed on the fluid flow path inside the valve housing and biasing the valve body toward the valve opening side in the operation direction,
The spring member is formed in a spiral shape having the operation direction as an axial direction, and has one end connected to the valve body and a spring main body extending from the one end toward the valve seat. And the other end connected to the valve housing,
The other end is expanded or contracted with respect to the spring body in a free state,
The valve housing includes a second end holding portion that holds the other end portion in a state of being compressed and deformed from a free state. The other end portion is formed in a truncated cone shape in a free state by a plurality of continuous annular portions,
The other end holding portion is configured to sandwich the other end portion from both sides in the operation direction so that the plurality of annular portions at the other end portion are aligned in the radial direction. The valve device according to claim 1.   The valve device according to claim 1, wherein the valve body includes an end holding portion that holds the one end portion. The spring main body part and the other end part are formed in a truncated cone shape as a whole with the one end part side as a small diameter side,
The valve device according to any one of claims 1 to 3, wherein the other end portion has a larger inclination angle with respect to the operation direction than the spring main body portion. The valve housing has a housing main body having the valve seat, and a cylindrical plug member that accommodates the valve body and is attached to the housing main body,
The other end holding portion is configured by a tip portion of the plug member on the other end side in the operation direction and a facing portion of the housing main body facing the tip portion in the operation direction. The valve device according to any one of claims 1 to 4, wherein the valve device is characterized in that:

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