JP2020076479A - Valve gear - Google Patents

Abstract

To provide a valve gear which can fix a support member to a body case accurately while achieving reduction of costs.SOLUTION: A valve gear includes: a valve body 5 having a body case 2 having a cylindrical part 22, in which an inner peripheral surface is formed with a step part 21, a valve disc 3 housed in the body case, and a support member 4 which is disposed in contact with the step part of the body case and supports the valve disc in the body case; and a flange 6 having a fitting part 61 which is fitted in the cylindrical part of the body case. The support member has: a connection part connected to the valve disc; and an extension part extending from the connection part to the radial outer side. An end part 22a of the cylindrical part is fixed to the fitting part by swaging in a state that the extension part of the support member is pressed so as to be plastically deformed between the step part of the cylindrical part and the fitting part fitting in the cylindrical part. The cylindrical part, the flange, and the support member are formed by the same material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve device.

  Conventionally, for example, in a refrigeration cycle of a car air conditioner or the like, a valve device for pressure adjustment is arranged between an evaporator (evaporator) and a compressor (compressor), and the valve device for pressure adjustment (pressure adjustment valve) is arranged. By this, the refrigerant pressure in the evaporator is adjusted so as not to fall below a predetermined pressure to prevent frosting (frost) of the evaporator.

  As a conventional technology of such a pressure control valve, for example, in Patent Document 1, the valve is connected to a refrigerant pipe connected to an evaporator and a compressor, and the bellows expands and contracts in the main body case according to the pressure of the refrigerant to open and close the valve. A valve device is disclosed.

  In the valve device disclosed in Patent Document 1, a washer is provided to support the bellows with respect to the main body case. The washer has a central portion fixed to the end portion of the bellows and three extending portions that extend radially outward from the central portion. The end of the extending portion is axially sandwiched between the flange and the stepped portion of the body case, and the washer is attached to the body case by crimping the end of the body case to the flange. It will be.

  Here, since the washer material has rigidity or hardness higher than that of the material of the flange and the main body case, an axis that is pressed from the flange to the washer toward the stepped portion of the main body case at the time of assembling. When a force is applied, the flange with which the end of the extending portion of the washer abuts and the stepped portion of the main body case are deformed so as to be depressed. Since the end portion of the extending portion sinks into this recess, the washer is supported so as not to be rotatable relative to the main body case and the flange around the axis.

JP, 2005-4395, A

  However, in such a conventional technique, three extension parts of the washer are provided, and if the recesses are not evenly secured in each extension part, the washer tilts with respect to the axis line, and the smooth operation of the valve device is prevented. There is a risk of damage. Therefore, when assembling the valve device, it is required that the caulking pressure be evenly applied when the end portion of the main body case is caulked to the flange. However, since it is difficult to apply the crimping pressure evenly and accurately, the number of manufacturing steps increases, resulting in an increase in cost.

  The present invention has been made in view of the above problems, and an object thereof is to provide a valve device capable of accurately fixing a support member to a main body case while achieving cost reduction.

  In order to solve the above-mentioned problems, a valve device according to the present invention includes a main body case having a cylindrical portion having a step portion formed on an inner peripheral surface thereof, a valve body housed in the main body case, and the main body case. A valve body having a support member that is disposed in contact with the step portion and that supports the valve body in the main body case, and a flange having a fitting portion that is fitted to the cylindrical portion of the main body case. , And the support member has a connecting portion connected to the valve body, and an extending portion extending radially outward from the connecting portion, the extending portion of the support member, With the step portion of the cylindrical portion and the fitting portion fitted to the cylindrical portion being pressed so as to be plastically deformed, the end portion of the cylindrical portion is caulked with respect to the fitting portion. It is fixed, and the cylindrical portion, the flange, and the support member are formed of the same material.

  According to the present invention, it is an object of the present invention to provide a valve device capable of accurately fixing a support member to a main body case while reducing costs.

FIG. 1 is an axial sectional view showing an embodiment of a pressure regulating valve according to the present invention. FIG. 2 is a plan view of the washer 4 as seen in the direction of the axis L. FIG. 3 is a perspective view of the washer 4. FIG. 4 is an enlarged view showing an arrow A portion of FIG. FIG. 5 is an enlarged view of a portion indicated by an arrow A in FIG. 1, showing a state before a load is applied by the pressing device. FIG. 6 is an enlarged view of a portion indicated by an arrow A in FIG. 1 and shows a state after a load is applied by the pressing device. FIG. 7 is a plan view of the washer 4A according to the modification.

  Hereinafter, embodiments of a valve device according to the present invention will be described with reference to the drawings. In the following, the valve device according to the present invention will be described mainly by exemplifying a pressure control valve used in a refrigeration cycle of a car air conditioner or the like, but the valve device according to the present invention is not limited to the pressure control valve. Can also be applied to various types of valve devices such as check valves.

<Structure of pressure regulating valve>
FIG. 1 shows a cross-sectional view of the pressure regulating valve according to the embodiment of the present invention. Here, the axis of the pressure regulating valve 1 is L.

  A pressure regulating valve 1 shown in FIG. 1 has a refrigerant passage through which a refrigerant passes, and a substantially cylindrical main body case 2, a valve body 3 housed in the main body case 2, and a valve body 3 are supported in the main body case 2. A valve body 5 including a washer (supporting member) 4 and a flange 6 fixed to the valve body 5. A refrigerant pipe (not shown) connected to, for example, an evaporator and a compressor is connected to the valve body 5 and the flange 6 to form a refrigeration cycle. Here, it is assumed that the right side of the pressure regulating valve 1 is the inlet side of the refrigerant and the left side is the outlet side of the refrigerant, as indicated by the arrows in FIG.

  The main body case 2 of the valve main body 5 has a connecting portion 23 connected to the refrigerant pipe, and a cylindrical portion 22 having an inner diameter larger than that of the connecting portion 23 and a step portion 21 formed on the inner peripheral surface. The inside of the connecting portion 23 is, for example, an inlet-side flow passage 23b through which the refrigerant flows from the evaporator via a refrigerant pipe, and a projecting portion 24 is formed at the inlet-side end portion 23a so as to face away from the axis L. Has been done. A female screw hole 24a for fastening the refrigerant pipe is formed in the protruding portion 24 of the connecting portion 23 in parallel with the axis L. A valve seat 25 is formed at an outlet side end 23c of the connecting portion 23 so that a valve seat portion 31c of a valve portion 31, which will be described later, can be seated / separated.

  The valve body 3 housed in the main body case 2 has a valve portion 31 slidably fitted in the connection portion 23 of the main body case 2, and a bellows assembly 33 for adjusting the valve opening pressure of the valve portion 31. The bellows assembly 33 is made of a metal plate 35 that is gripped by the valve portion 31, and a metal bellows that is connected to the valve portion 31 via the plate 35 and is retractably housed in the cylindrical portion 22 of the main body case 2. 32 and an adjusting screw 34 for adjusting the set load of the bellows 32.

  The valve portion 31 has a function of moving along the axis L in the main body case 2 according to the refrigerant pressure and adjusting the flow rate of the refrigerant flowing from the inlet side flow passage 23b. The valve portion 31 has a substantially cylindrical sliding portion 31a having a refrigerant flow passage formed therein and having an outer shape that is substantially the same as the inner diameter of the connecting portion 23 of the body case 2, and has a larger diameter than the sliding portion 31a. The outer edge portion of the lever has a valve seat 25 of the connection portion 23 and a valve seat portion 31c which is seated / separated. A plurality of deficient portions 31b are formed on the side portion of the sliding portion 31a at substantially equal intervals in the circumferential direction, and the deficient portions 31b secure a flow path through which the refrigerant passes. Further, a through hole 31e is formed substantially in the center of the valve seat portion 31c, and a plurality of claw portions 31d are formed on the outer edge of the outlet side surface 31f of the valve seat portion 31c at positions substantially symmetrical with respect to the axis L. To be done. Further, between the through hole 31e and the claw portion 31d, a convex portion 31g having a height lower than that of the claw portion 31d is formed.

  The bellows 32 has a bellows-shaped and expandable / contractible side wall portion 32a and a bottom plate portion 32b that closes the inlet side of the side wall portion 32a in the axis L direction, and the outlet side in the axis L direction is open. . The bottom plate portion 32b of the bellows 32 is welded to a substantially disc-shaped metal plate 35. The plate 35 is sandwiched between the claw portion 31d and the convex portion 31g provided on the outlet side surface 31f of the valve seat portion 31c, so that the bellows 32 is connected to the valve portion 31. Further, the outlet end of the bellows 32 on the outlet side is welded and joined to the enlarged diameter portion 34b provided on the inlet end 34a of the adjusting screw 34, whereby a sealed space SP is formed inside the bellows 32. An inert gas such as nitrogen or helium is enclosed in the closed space SP.

  The adjusting screw 34 adjusts the set load of the bellows 32. A male screw 34e screwed on the outer peripheral surface of the screw portion 34d is screwed with a female screw 41e screwed on the inner peripheral surface of the washer 4 described later. ing. Since the washer 4 is fixed to the main body case 2 as described later, when a tool (not shown) is engaged with the engaging slit 34g at the end of the adjusting screw 34 to rotate the adjusting screw 34, a female screw is formed. The adjustment screw 34 moves in the direction of the axis L by screwing the screw portion 34d with respect to 41e, and the length of the bellows 32 changes accordingly, so that the set load of the bellows 32 is adjusted. The adjusting screw 34 is screwed to the washer 4 and is supported inside the main body case 2 via the washer 4. After the adjustment of the adjusting screw 34 is completed, the lock nut 36 is screwed into the adjusting screw 34, whereby the unintentional screwing of the female screw 41e and the adjusting screw 34 can be prevented.

  Inside the bellows 32, a stem 331, a guide 332, a coil spring 333, and a bellows retainer 334 are provided. The stem 331, the guide 332, the coil spring 333, and the bellows retainer 334 are made of metal members.

  The stem 331 and the guide 332 are guide members that guide the movement of the valve portion 31 in the axis L direction. The stem 331 is a shaft member extending in the direction of the axis L of the body case 2. The inlet end portion of the stem 331 protruding from the end opening of the guide 332 on the valve portion 31 side is fixed to a bellows retainer 334 that presses the bottom plate portion 32b of the bellows 32 from the inside. Therefore, the stem 331 is connected to the valve portion 31 via the bellows retainer 334 and the bottom plate portion 32b of the bellows 32, and moves together with the valve portion 31.

  The outlet side portion of the stem 331 is inserted inside a guide 332 that is a cylindrical member, and is slidable inside the guide 332. The outlet side end of the guide 332 is fitted and held by the facing enlarged diameter portion 34 b of the adjusting screw 34. Further, the outlet side end of the guide 332 is biased by the coil spring 333 and is constantly pressed against the adjusting screw 34, so that it is held without being separated from the expanded diameter portion 34b.

  Like the bellows 32, the coil spring 333 applies a load to the valve portion 31 toward the side that closes the refrigerant passage. The outlet side end of the coil spring 333 is held by the outlet side end of the guide 332, and the inlet side end of the coil spring 333 is held by the bellows retainer 334.

  Next, the washer 4 will be described. 2 is a plan view of the washer 4 as seen in the direction of the axis L, and FIG. 3 is a perspective view of the washer 4. The axis of the washer 4 is X. The washer 4 has a central annular portion (connecting portion) 41 and a plurality of (here, three) extending portions 42 that radially extend outward from the central annular portion 41 in the radial direction. The outer end of the extending portion 42 is an outer peripheral portion 43 that extends in the circumferential direction to form a single annular shape. On the inner peripheral surface of the central annular portion 41, a female screw 41e screwed with a male screw 34e screwed on the screw portion 34d of the adjusting screw 34 is screwed. The connecting portion between the central annular portion 41 and the extending portion 42 is connected with a smooth arc when viewed in the axis X direction, and the connecting portion between the extending portion 42 and the outer peripheral portion 43 is smooth when viewed in the axis X direction. It is connected by an arc.

  The extending portions 42 are arranged at substantially equal intervals in the circumferential direction, and a refrigerant flow path is formed by the three spaces PG surrounded by the central annular portion 41, the extending portion 42, and the outer peripheral portion 43. Further, the thickness of the washer 4 is such that the female screw 41e screwed on the inner peripheral surface and the male screw 34e (FIG. 1) of the screw portion 34d of the adjusting screw 34 can be screwed sufficiently long, for example, when the internal refrigerant flow or when the vehicle is traveling. It is designed to withstand the vibration of. As shown in FIG. 1, the washer 4 is fixed to the adjusting screw 34 by the lock nut 36 after the set load of the bellows 32 is adjusted by the adjusting screw 34.

  In FIG. 1, the hollow flange 6 has a fitting portion 61 and a connecting portion 62. The inner peripheral surface 61c of the fitting portion 61 is gradually reduced in diameter toward the outlet side and is connected to the inner peripheral surface 62a of the connecting portion 62 having a substantially constant inner diameter. An annular groove portion 61b is formed on the outer peripheral surface of the fitting portion 61, and an O-ring 63 as a seal member that seals between the inner peripheral surface of the cylindrical portion 22 and the outer peripheral surface of the fitting portion 61 is formed in the annular groove portion 61b. It is installed.

  The inside of the connecting portion 62 is, for example, an outlet-side flow path that allows the refrigerant to flow out to the compressor via a refrigerant pipe, and a protruding portion 64 is formed toward the side away from the axis L. A female screw 64a for fastening the refrigerant pipe is formed parallel to the axis L direction.

  An annular recess 65 is formed on the outer peripheral surface of the fitting portion 61 at a portion corresponding to the outlet end 22a of the cylindrical portion 22 of the main body case 2. A plurality of portions of the outlet side end portion 22a of the cylindrical portion 22, specifically, four portions of the outlet side end portion 22a are pressed and deformed toward the depressions 65 at equal intervals in the circumferential direction, and the cylinder of the main body case 2 is deformed. The portion 22 and the fitting portion 61 of the flange 6 are fixed by the caulking C, which will be described in detail later.

  The main body case 2 including the cylindrical portion 22, the flange 6, and the washer 4 are formed of the same material (here, aluminum material).

  FIG. 4 is an enlarged view of a portion indicated by an arrow A in FIG. 1, in which the surface roughness is exaggerated. Here, the surface roughness of the inlet side end portion 61a of the fitting portion 61, the surface roughness of the step portion 21 of the cylindrical portion 22 of the main body case 2, and the first portion of the outer peripheral portion 43 of the washer 4 that abuts the inlet side end portion 61a. The surface roughness of the first surface 43a and the surface roughness of the second surface 43b of the outer peripheral portion 43 of the washer 4 that contacts the step portion 21 are substantially equal. Specifically, each surface roughness is 20 μm to 30 μm in terms of arithmetic average roughness, and the difference is preferably 10 μm or less.

<Operation of pressure regulating valve>
Next, the operation of the pressure regulating valve 1 described above will be briefly described. In FIG. 1, for example, the refrigerant pressure of an evaporator connected to the main body case 2 of the valve main body 5 via a refrigerant pipe (not shown) urges the valve portion 31 in the valve closing direction (rightward in FIG. 1). When the load is smaller than the set load of the bellows 32 and the coil spring 333, the valve seat portion 31c of the valve portion 31 is seated on the valve seat 25 of the connecting portion 23 of the main body case 2, and the flow rate of the refrigerant flowing through the pressure regulating valve 1 is reduced.

  Further, for example, when the refrigerant pressure of the evaporator is larger than the set loads of the bellows 32 and the coil spring 333 that urge the valve portion 31 in the valve closing direction, the valve portion 31 moves in the valve opening direction (left in FIG. 1). Then, the valve seat portion 31c of the valve portion 31 is separated from the valve seat 25 of the connection portion 23 of the main body case 2, and the flow rate of the refrigerant flowing through the pressure regulating valve 1 is increased.

<Assembly of pressure control valve>
Next, a process of assembling the pressure regulating valve 1 described above will be described. When assembling the pressure regulating valve 1, first, the stem 331, the guide 332, the coil spring 333 and the bellows retainer 334 are assembled in the bellows 32 as described above, and then the plate 35 and the adjusting screw 34 are welded to the bellows 32. The bellows assembly 33 is manufactured by joining them, and the bellows assembly 33 and the valve portion 31 and the like are integrally assembled to manufacture the valve body 3. Next, the washer 4 is screwed onto the screw portion 34d of the adjusting screw 34 of the valve body 3 to be arranged at a predetermined position, and the washer 4 is fixed to the screw portion 34d of the adjusting screw 34 by the lock nut 36. Next, the newly assembled valve body 3, washer 4, and lock nut 36 are inserted into the main body case 2, and the sliding portion 31a of the valve portion 31 of the valve body 3 is fitted into the connecting portion 23 of the main body case 2. At the same time, the outer peripheral portion 43 of the washer 4 is placed in contact with the step portion 21 of the cylindrical portion 22 of the main body case 2.

  Next, with the O-ring 63 attached to the annular groove 61b, the fitting portion 61 of the flange 6 is fitted into the cylindrical portion 22 of the body case 2 from the outlet side end 22a of the body case 2. An arrow A portion of FIG. 1 in such a state is enlarged and shown in FIG. As shown in FIG. 5, when the flange 6 and the main body case 2 are simply in contact with the outer peripheral portion 43 of the washer 4, the outer peripheral portion 43 is not deformed.

  After that, the body case 2 and the flange 6 are pressed with a predetermined pressure or more in the axis L direction by using, for example, a pressing device (not shown). As a result, as shown in FIG. 6, the inlet-side end portion 61a of the fitting portion 61 and the first surface 43a of the outer peripheral portion 43 of the washer 4 that abuts on the inlet-side end portion 61a are plastically deformed and expand in the radial direction. Becomes Further, the second surface 43b of the outer peripheral portion 43 of the washer 4 that abuts the step portion 21 of the cylindrical portion 22 is also plastically deformed and swells in the radial direction. As a result, a gap δ is generated between the central portion of the outer peripheral portion 43 of the washer 4 in the axis L direction (FIG. 1) and the inner peripheral surface of the cylindrical portion 22. Further, an end portion of the outer peripheral portion 43 of the washer 4 in the direction of the axis L (FIG. 1) and an inner peripheral surface of the cylindrical portion 22 are in contact with each other at a contact point P.

  However, since the main body case 2, the flange 6 and the washer 4 are formed of the same material, the inlet side end portion 61a of the fitting portion 61 that abuts the first surface 43a of the outer peripheral portion 43 of the washer 4 also has its first portion. The stepped portion 21 of the cylindrical portion 22 that abuts the second surface 43b is also not substantially recessed. In other words, even if the main body case 2 and the flange 6 are pressed with a strong pressure, the deformation of the step portion 21 in the direction of the axis L can be suppressed, so that the axis X of the washer 4 is the axis of the pressure regulating valve 1. Inclination with respect to L can be suppressed.

  Further, while maintaining the state in which the main body case 2 and the flange 6 are pressed with a predetermined pressure or more in the axis L direction, a plurality of locations of the outlet side end portion 22a of the cylindrical portion 22 are formed on the outer peripheral surface of the fitting portion 61. The cylindrical portion 22 of the main body case 2 and the fitting portion 61 of the flange 6 are fixed by the caulking C by pressing inward in the radial direction toward the formed recess 65. This completes the assembly of the pressure regulating valve 1.

  According to the present embodiment, the surface roughness of the inlet-side end portion 61a of the fitting portion 61, the surface roughness of the step portion 21 of the cylindrical portion 22 of the main body case 2, and the outer circumference of the washer 4 that abuts the inlet-side end portion 61a. The surface roughness of the first surface 43a of the portion 43 and the surface roughness of the second surface 43b of the outer peripheral portion 43 of the washer 4 that is in contact with the step portion 21 are substantially equal in the state of being machined. Therefore, by applying a strong pressing force in the direction of the axis L, the inlet-side end portion 61a and the first surface 43a are strongly engaged with each other, and the step portion 21 and the second surface 43b are strongly and closely contacted with each other. Since they are engaged with each other in this state, it is possible to prevent the washer 4 from rotating relative to the main body case 2 due to the frictional force (and ringing phenomenon) resulting from this.

  Further, since the washer 4 has the annular outer peripheral portion 43, the washer 4 abuts the inlet side end portion 61a and the step portion 21 over the entire circumference, that is, the outer end of the extending portion 42 without the outer peripheral portion 43 abuts. Since the contact area is greatly increased as compared with the case where the washer 4 is rotated, relative rotation of the washer 4 with respect to the main body case 2 can be more effectively prevented. Further, by providing the annular outer peripheral portion 43, the eccentricity with respect to the step portion 21 having substantially the same diameter is suppressed, so that the coaxiality of the washer 4 with respect to the main body case 2 is improved and the smooth operation of the bellows assembly 33 is secured. You can also do it.

[Modification]
A modified example of the washer according to the present invention is shown in FIG.

  The washer 4A in FIG. 7 includes a central annular portion 41, an extending portion 42 that radially extends outward from the central annular portion 41, and an outer peripheral portion that extends from the outer end of each extending portion 42 to both sides in the circumferential direction. 43A. Each outer peripheral portion 43A may be a part of a coaxial ring. The lengths extending from the respective extension portions 42 do not have to be equal on both sides, and may differ for each extension portion 42. With respect to the other configurations, the same reference numerals are given and duplicate description is omitted.

  The present invention is not limited to the above embodiment. Modifications of any of the above-described embodiments are possible within the scope of the invention. Further, in the above-described embodiment, arbitrary constituent elements can be added or omitted.

1 Pressure regulating valve 2 Body case 3 Valve body 4 Washer (supporting member)
5 Valve Main Body 6 Flange 21 Stepped Part 22 Cylindrical Part 23 Connection Part 24 Projection Part 25 Valve Seat 31 Valve Part 32 Bellows 33 Bellows Assembly 34 Adjustment Screw 35 Plate 41 Central Annular Part 42 Extending Part 43 Outer Part 61 Fitting Part 62 Connection part 63 O-ring 64 Projection part L axis

Claims (4)

A main body case having a cylindrical portion with a stepped portion formed on the inner peripheral surface thereof, a valve body housed in the main body case, and abuttingly disposed on the stepped portion of the main body case, the valve body A valve body having a support member supported therein,
A flange having a fitting portion fitted to the cylindrical portion of the main body case,
The support member includes a connecting portion connected to the valve body, and an extending portion extending radially outward from the connecting portion,
The extending portion of the supporting member is pressed so as to be plastically deformed between the step portion of the cylindrical portion and the fitting portion fitted to the cylindrical portion, and the end portion of the cylindrical portion is It is fixed by caulking to the fitting part,
The cylindrical portion, the flange, and the support member are formed of the same material,
A valve device characterized by the above. The extending portion has an outer peripheral portion extending in a circumferential direction from an outer end thereof, and the outer peripheral portion is sandwiched between a step portion of the cylindrical portion and the fitting portion.
The valve device according to claim 1, wherein: The outer peripheral portion has a continuous annular shape in the circumferential direction,
The valve device according to claim 2, wherein: With the end portion of the cylindrical portion fixed by crimping to the fitting portion, the axial center portion of the outer peripheral portion has a gap with respect to the cylindrical portion, and the axial end portion of the outer peripheral portion is formed. The part contacts the cylindrical part,
The valve device according to claim 2 or 3, characterized in that.

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