JP4608395B2 - Valve device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a valve device that is easy to manufacture.

  An example of an electromagnetic on-off valve that opens and closes a fluid flow path is disclosed in Patent Document 1. This solenoid valve has a cylindrical stainless steel valve body with one end closed, a plunger slidably accommodated at one end of the valve body, and a central portion of the valve body facing the plunger. A valve element connected to the plunger through the suction element, a valve seat sheet member made of stainless steel that closes the opening on the other end side of the valve body, and the valve seat sheet member A valve seat that is opened and closed by the valve body, a coil spring that is arranged between the plunger and the suction element and biases the valve body away from the valve seat, and resists the spring force of the coil spring. And an electromagnetic coil that excites the attractor so that the valve body closes the valve seat.

  Further, in Patent Document 2, a stainless steel valve body having a cylindrical shape in which one end side is bent inward to form a valve seat portion, and a cylindrical shape slidably accommodated at one end side of the valve main body. A plunger that is held by the plunger and whose tip can open and close the valve seat, a suction element fitted to the valve body so as to close the opening on the other end side of the valve body, and the suction A spring that is interposed between the child and the base end of the valve body and biases the valve body so as to close the valve seat, and the valve body opens the valve seat against the spring force of the spring. It has an electromagnetic coil that excites the attractor.

JP 2004-092664 A JP 2002-139169 A

Since the conventional solenoid valve disclosed in Patent Document 1 has a cylindrical shape in which one end of the valve body is closed, a plunger, a valve body integrated with the plunger, a suction element, a coil spring, and the like are incorporated in the valve body in advance. After that, it is necessary to TIG weld the valve seat member to the valve body so as to close the opening on the other end side of the valve body .

In the electromagnetic valve disclosed in Patent Document 2, after a pair of joints to which piping is connected are brazed to the valve body, the plunger, the valve body, and the spring are accommodated in the valve body, and the suction element is placed in the valve body. Since it can be crimped integrally by being fitted to the other end portion, it can be manufactured more easily than Patent Document 1. In this valve body disclosed in Patent Document 2, Ru effective der when the flow rate of the fluid flowing in the pair of joint is small.

(Object of invention)
It is an object of the present invention to avoid unnecessary enlargement of the valve body even when a large-diameter joint capable of flowing a large amount of fluid is easy to manufacture and assemble. Is to provide a valve device that can be made compact and a method for manufacturing the valve device.

The first aspect of the present invention has a small diameter portion and a large diameter portion connected to the small diameter portion via a step portion, and a main body having a tubular shape in which a joint joint hole is formed in the large diameter portion,
A first joint having a cylindrical shape that is inserted into the joint joint hole and joined to the large diameter portion so as to protrude from the large diameter portion;
It has a valve seat part and a cylindrical joint holding part that follows, and the outer peripheral edge part is joined to the opening end part of the large-diameter part so that they are aligned with the longitudinal axis of the main body. An annular valve seat member;
A second joint having a cylindrical shape joined to the joint holding portion in a state of being fitted thereto;
A valve body that has a plunger that is slidably fitted to the small-diameter portion, and projects from the plunger so as to face the valve seat portion, thereby opening and closing the valve seat portion;
An annular spring receiver fixed to the stepped portion, and a compression spring that is interposed between the spring receiver and the plunger and biases the valve body away from the valve seat portion, A valve device characterized by comprising valve body driving means for opening and closing the valve body.

  In the present invention, the valve seat portion is opened and closed by operating the valve body driving means to guide the plunger integral with the valve body to the small diameter portion, and between the first joint and the second joint. Switches between fluid movement and fluid movement stop. In such a valve device, the first joint and the valve seat member are integrally joined to the main body, and the second joint is integrally joined to the valve seat member. The valve body is accommodated from the opening end side of the small diameter portion to the large diameter portion side.

In the valve device according to the first aspect of the present invention, the large- diameter portion may have a caulking portion for fixing the spring receiver to the main body.

  The first joint can have positioning means that can bulge from its outer peripheral surface and be locked to the opening edge of the joint joint hole.

  The large-diameter portion can further include alignment means that can bulge from the inner peripheral surface at the opening end portion and can be locked by the outer peripheral edge of the valve seat portion.

  According to a second aspect of the present invention, there is provided a method of manufacturing a valve device according to the first aspect of the present invention, in which a step of press-molding a cylindrical main body and a joint joint hole in the large-diameter portion of the main body are formed. A step of press-molding an annular valve seat member; a tubular first joint is inserted into the joint joint hole; the valve seat member is inserted into an open end of the large-diameter portion; A cylindrical second joint is inserted into the joint holding portion, and the valve seat member and the first and second joints are respectively positioned in the furnace while being brazed in the furnace. And a step of incorporating a valve body into the main body from the small diameter portion side.

  In the present invention, a cylindrical main body having a small-diameter portion and a large-diameter portion connected to the small-diameter portion via a step portion is press-molded from a preform formed in a predetermined shape close to the shape of the plate material, pipe material, or main body. At the same time, a joint joint hole is formed in the large-diameter portion of the main body, while an annular valve seat member having a valve seat portion and a cylindrical joint holding portion that follows the valve seat portion is press molded. Next, the valve seat member is inserted into the opening end of the large-diameter portion so that the valve seat portion and the joint holding portion of the valve seat member are aligned with the longitudinal axis of the main body, and the joint holding of the valve seat member is performed. A cylindrical second joint is inserted into the part, while a cylindrical first joint is inserted into the joint joint hole. Then, the valve seat member and the first and second joints are respectively positioned with respect to the main body, and these are brazed together in the furnace. Thereafter, the valve body is incorporated into the main body from the small diameter side.

  In the method for manufacturing a valve device according to the second aspect of the present invention, the step of incorporating an annular spring receiver into the step portion of the main body prior to brazing in the furnace and fixing the large diameter portion to the main body by caulking the large diameter portion. Can further comprise.

According to a first embodiment of the valve device of the present invention, the body and the first joint and the valve seat member can be collectively bonded to the second joint, yet open end of the small diameter portion after these junctions A valve body and a plunger can be incorporated into the body from the side. For this reason, manufacture and an assembly of a valve apparatus are easy, and it is possible to reduce the manufacturing cost. Further, it is only necessary to change the size of the large diameter portion according to the diameters of the first and second joints, and it is not necessary to change the diameter of the small diameter portion, so that the entire valve device can be made compact and light. it can. In addition, an additional component for fixing the spring receiver to the main body is not necessary, and an increase in the weight of the valve device can be suppressed.

  When the first joint has positioning means that bulges from the outer peripheral surface and can be locked to the opening end edge of the joint joint hole, the first joint is for maintaining the relative position when the main body and the first joint are joined. The jig can be omitted or simplified, and the manufacturing process can be further simplified.

  When the large-diameter portion further has alignment means that bulges from the inner peripheral surface at the opening end portion thereof and can be locked by the outer peripheral edge portion of the valve seat portion, the relative position of these when the main body and the valve seat member are joined Can be omitted or simplified, and the manufacturing process can be further simplified.

  According to the method for manufacturing the valve device of the second aspect of the present invention, after the cylindrical main body is press-molded, the joint joint hole is formed in the large-diameter portion of the main body, and the annular valve seat member is press-molded. Insert a cylindrical first joint into the joint hole, insert a valve seat member into the open end of the large-diameter portion, and then insert a cylindrical second joint into the joint holding portion. Since the seat member and the first and second joints are respectively positioned and brazed together in the furnace, the valve body is incorporated into the main body from the small diameter side, so the main body and the first joint After the valve seat member and the second joint are joined together, the valve body and the plunger can be incorporated into the main body from the opening end side of the small diameter portion. For this reason, manufacture and assembly of a valve apparatus are easy, and it is possible to reduce the manufacturing cost. Moreover, it is only necessary to change the size of the large diameter portion according to the diameters of the first and second joints, and it is not necessary to change the diameter of the small diameter portion, so that the entire valve device can be made compact.

  If an annular spring receiver is installed in the step of the main body prior to brazing in the furnace, and the large diameter part is fixed to the main body by caulking, an additional part for fixing the spring receiver to the main body Is unnecessary, and an increase in the weight of the valve device can be suppressed.

  An embodiment in which the valve device according to the present invention is applied to a throttle valve for dehumidification of an air conditioner will be described in detail with reference to FIG. 1 showing the overall cross-sectional structure and FIG. However, the present invention is not limited to such an embodiment, and all changes and modifications included in the concept of the present invention described in the claims are possible, and therefore belong to the spirit of the present invention. Of course, it can be applied to any other technology.

  The dehumidifying throttle valve 10 according to the present embodiment is a so-called normally open electromagnetic drive type that is opened when de-energized, and is connected to the small diameter portion 11a and the small diameter portion 11a via a step portion 11b. A cylindrical main body 11 having a large-diameter portion 11c, and a first joint 13 having a cylindrical shape formed of a copper pipe inserted into a joint joint hole 12 formed in the large-diameter portion 11c of the main body 11. An annular valve seat member 14 having a valve seat portion 14a and a cylindrical joint holding portion 14b following the valve seat portion 14a, and having an outer peripheral edge portion joined to the open end portion 15 of the large diameter portion 11c. A second joint 16 that is joined to the joint holding portion 14b of the member 14 in a fitted state and is formed of a copper tube and a plunger 17 that is slidably fitted to the small diameter portion 11a. From the plunger 17 to the valve seat 14a A valve element 18 which projects to face can open and close the valve seat portion 14a, and comprises a valve body drive means 19 for opening and closing of the valve body 18.

  A refrigerant circulation pipe (not shown) is connected to the first and second joints 13 and 16, respectively. In the valve opening position shown in FIG. 1 where the valve body 18 is separated from the valve seat portion 14a, the first joint 13 and the second joint 16 communicate with each other via a valve chamber 20 formed in the large-diameter portion 11c. Is in a state. On the contrary, in the valve closing position shown in FIG. 2 where the valve body 18 presses against the valve seat portion 14a, the first joint 13 and the second joint 16 are a throttle device which will be described later and incorporated in the valve body 18. Communicate via

  The valve body drive means 19 in the present embodiment is interposed between an annular spring receiver 21 fixed to the step portion 11b of the main body 11 and the spring receiver 21 and the plunger 17, and the valve body from the valve seat portion 14a. A compression spring 22 that urges the valve 18 away from the main body 11 and a solenoid unit 23 that drives the valve body 18 toward the valve seat 14a against the spring force of the compression spring 22 are provided.

  The main body 11 in the present embodiment is formed by press-molding a circular stainless steel plate having a predetermined diameter and thickness, and the flange portion 21a of the spring receiver 21 is in contact with the stepped portion 11b. ing. The spring receiver 21 formed of stainless steel or the like in the form of a disk has the above-described annular flange portion 21a and a cylindrical guide that projects from the flange portion 21a toward the valve seat portion 14a to guide the movement of the valve body 18. Part 21b. The flange portion 21a of the spring receiver 21 is pressed against the step portion 11b by the caulking portion 24 formed by recessing a part of the large diameter portion 11c adjacent to the step portion 11b toward the inner peripheral side. Are integrally fixed. The guide portion 21b of the spring receiver 21 suppresses an unstable operation of the valve body 18 that may occur during the movement of the spring receiver 21 and causes a stable movement. Further, by surrounding the tip end portion of the valve body 18 (the outer peripheral edge portion of the port plate 36 described later) in the valve open state shown in FIG. 1, the refrigerant between the first joint 13 and the second joint 16 is surrounded. The vibration caused by the flow and the noise generated along with this can be suppressed. In addition, it is possible to suppress such a problem that the valve body 18 is drawn in the direction of the valve seat portion 14a due to the flow of the refrigerant, and the flow of the refrigerant becomes unstable.

  It is also possible to form the main body 11 by press molding from a stainless steel pipe having a predetermined thickness and diameter. Further, when the spring receiver 21 is fixed to the large-diameter portion 11c of the main body 11, it is not caulked as described above, but spot welding, brazing in the furnace together with the first joint 13, the valve seat member 14, and the second joint 16. You may make it join by attaching.

  The 1st coupling 13 is joined to this large diameter part 11c via the brazing part 25 so that it may protrude to the radial direction outer side (right side in the figure) from the large diameter part 11c. The first joint 13 is formed with a pair of inner positioning protrusions 26 spaced apart by 180 degrees that protrude outward in the circumferential direction and can be locked to the opening edge of the joint joint hole 12 on the inner wall side of the large diameter portion 11c. Yes. Further, a pair of outer positioning protrusions 27 that are 90 degrees out of phase with respect to the pair of inner positioning protrusions 26 are formed 180 degrees apart, and these pair of outer positioning protrusions 27 are formed on the outer wall side of the large-diameter portion 11c. It can be locked to the opening edge of the joint joint hole 12. That is, the fitting position of the first joint 13 is regulated by the two pairs of positioning projections 26 and 27 while the joint joint hole 12 of the large-diameter portion 11c is sandwiched. When inserting into the joint joint hole 12, it should be noted that the pair of inner positioning protrusions 26 are press-fitted into the joint joint hole 12. As long as the two pairs of positioning projections 26 and 27 functioning as positioning means for the first joint 13 in the present invention are formed at equal intervals in the circumferential direction of the first joint 13, three or more are formed respectively. Is also possible. Even in this case, it is preferable that the phases of the inner positioning protrusions 26 and the outer positioning protrusions 27 are shifted by a half pitch along the circumferential direction. It is to be noted that, when two or more positioning projections 26 and 27 are formed on the first joint 13, the rotation of the first joint 13 with respect to the joint joint hole 12 of the large-diameter portion 11 c is more appropriately formed. The alignment work can be speeded up by reducing the restrictions on the phase.

  The valve seat member 14 machined from stainless steel or the like having a disc shape is formed on the large diameter portion 11c of the main body 11 so that the valve seat portion 14a and the joint holding portion 14b are aligned with the longitudinal axis of the main body 11. The second joint 16 is also joined to the joint holding portion 14b of the valve seat member 14 so that the longitudinal axis thereof is aligned with the longitudinal axis of the main body 11. 29 is joined. In this embodiment, in order to facilitate positioning of the valve seat member 14 with respect to the open end of the large diameter portion 11c of the main body 11, the inner peripheral wall of the large diameter portion 11c that regulates the insertion position of the valve seat member 14 with respect to the large diameter portion 1c. A plurality of caulking portions 30 protruding inward in the radial direction are formed at the opening end portion 15 of the large diameter portion 11c.

  Of course, the relative positions of the first joint 13 and the valve seat member 14 with respect to the main body 11 can be regulated by means other than the positioning protrusions 26 and 27 and the caulking portion 30 as described above.

  On the open end side (the upper side in FIG. 1) of the small diameter portion 11a located on the opposite side of the second joint 16 with the large diameter portion 11c interposed therebetween, a plug 31 that closes the open end of the small diameter portion 11a is tightly connected. It is inserted in. The plunger 17 described above has a cup-shaped cross section through which the tip of the plug 31 can be inserted, and an annular buffer member 32 that can abut against the tip of the plug 31 is accommodated at the bottom of the plunger 17.

  The valve body 18 has a base end integrally caulked to the bottom portion of the plunger 17 and a valve rod 33 having a flange portion 33a formed at the distal end, and a valve-like surface of the valve rod 33 with a film-like gap 34 interposed therebetween. And a port plate 36 whose outer peripheral edge is caulked to the outer peripheral edge of the flange portion 33a of the valve rod 33 with the throttle plate 35 interposed therebetween. A plurality of first ports 37 communicating with the gap 34 between the diaphragm plate 35 and the diaphragm plate 35 are formed on the outer peripheral side of the flange portion 33a. In addition, a throttle passage 39 is formed in the central portion of the diaphragm plate 35 to communicate the gap 34 described above and the film-like gap 38 formed between the diaphragm plate 35 and the port plate 36. Further, a plurality of second ports 40 communicating with the gap 38 between the diaphragm plate 35 are formed on the outer peripheral side of the port plate 36 whose outer periphery becomes a tapered conical surface toward the valve seat portion 14a. . The portions up to the first and second ports 37 and 40 before and after the throttle passage 39 described above constitute the throttle device described above.

  The thickness of the gap 34 along the reciprocating direction of the valve rod 33, that is, the distance between the tip surface of the valve rod 33 and the surface of the throttle plate 35 facing the valve rod 33 is set to be narrower than the inner diameter of the throttle passage 39. Similarly, the thickness of the gap 38 along the reciprocating direction of the valve rod 33, that is, the facing distance between the throttle plate 35 and the port plate 36 is also set narrower than the inner diameter of the throttle passage 39. In general, it is generally preferable that the thickness of the gaps 34 and 38 is set to be narrower to about 1/4 of the inner diameter of the throttle passage 39 because the fluid between the throttle passage 39 and the gaps 34 and 38 is not preferable. This is because the change in the cross-sectional area of the channel becomes the smoothest. The two gaps 34, 38 communicating with both sides of the throttle passage 39 define a slit-like refrigerant passage extending in a direction orthogonal to the axis of the throttle passage 39, so that noise generated in the throttle passage 39 is generated. It is difficult for the two gaps 34 and 38 to be transmitted to the outside, and good silence can be obtained.

  In the present embodiment, the first joint 13 communicates with the first joint 13 at the valve closing position as shown in FIG. 2 where the conical outer peripheral surface of the port plate 36 at the tip of the valve rod 33 contacts the valve seat 14a. Since the opening end of the port 37 is set so as to be located in the extending region Z along the longitudinal direction of the first joint 13 of the refrigerant passage defined by the first joint 13, the first joint The flow direction of the fluid flowing between the first port 37 and the first port 37 can be maintained substantially linear without being strongly bent, thereby making it possible to reduce noise.

  By the way, when a minute foreign matter or the like is mixed in the refrigerant passing through the dehumidifying throttle valve 10, such a foreign matter is formed in the first port 37 of the flange portion 33 a or the throttle passage 39 formed in the throttle plate 35, Alternatively, the second port 40 of the port plate 36 may be blocked, and the normal function of the dehumidifying throttle valve 10 may not be achieved. From this point of view, in the present embodiment, one end side is disposed so as to surround the outer peripheral edge portion of the flange portion 33a, and a tubular filter 41 that is caulked integrally with the flange portion 33a by the port plate 36 is attached to the valve rod 33. ing. The other end of the filter 41 is integrally embedded in a collar 42 that is tightly fitted to the stepped portion 33 b of the valve rod 33, and the first port 37 and the first joint 13 are interposed via the filter 41. Are in a state of communication.

  Regarding the configuration and attachment method of the filter, there are matters that can be arbitrarily selected other than the present embodiment. Similarly, the configuration of the valve body 18 and the above-described throttling device is not directly related to the present invention, and thus any other configuration can be adopted.

  The solenoid unit 23 of the valve body 18 in the present embodiment uses an electromagnetic coil 43, and a bobbin 44 that accommodates the electromagnetic coil 43, and the bobbin 44 is embedded together with the electromagnetic coil 43 via a sealing resin 45. And a frame-like casing 47 fixed to the plug 31 via a bolt 46. A cable (not shown) drawn from the electromagnetic coil 43 to the outside via the sealing resin 45 is connected to the power source via the on / off circuit. The bobbin 44 is disposed so as to surround the plunger 17 via the small diameter portion 11a, and generates an electromagnetic force that moves the plunger 17 toward the large diameter portion 11c when energized.

  As described above, the compression spring 22 for urging the valve body 18 away from the valve seat portion 14a is incorporated between the bottom portion of the plunger 17 and the flange portion 21a of the spring receiver 21, and therefore, the electromagnetic coil. When the power is not supplied to 43, the first joint 13 and the second joint 16 are in communication with each other through the valve chamber 20 of the main body 11 without the valve body 18 as shown in FIG.

  Such a dehumidifying throttle valve 10 can be manufactured as follows. First, a cylindrical main body 11 is press-molded in a plurality of times from a stainless steel plate punched into a circle having an appropriate diameter, and a joint joint hole 12 is punched into a large-diameter portion 11 c of the main body 11. An annular valve seat member 14 is press-molded from a disk-shaped plate material, and the valve seat portion 14a is punched out simultaneously. Similarly, the spring receiver 21 is obtained by press molding from a plate-like plate material.

  Next, the spring receiver 21 is inserted from the opening end side of the large diameter portion 11c of the main body 11 with the flange portion 21a forward, and the flange portion 21a is placed on the step portion 11b. In this state, a part of the large-diameter portion 11 c adjacent to the step portion 11 b is recessed toward the inner peripheral side to form a caulking portion 24, and the spring receiver 21 is integrally fixed to the step portion 11 b of the main body 11. At this time, the caulking portion 30 is also formed at the same time.

  On the other hand, although the first and second joints 13 and 16 are prepared, two pairs of positioning protrusions 26 and 27 are previously press-formed on the first joint 13.

  Thereafter, the first joint 13 is inserted into the joint joint hole 12, the valve seat member 14 is inserted into the open end 15 of the large diameter portion 11c, and the second joint 16 having a cylindrical shape is formed in the joint holding portion 14b. Insert and insert an annular solid brazing material into these joints. And in the state which positioned the valve seat member 14 and the 1st and 2nd couplings 13 and 16 with respect to the main body 11, these were collectively brazed in the furnace, and the main body 11 and the 1st couplings 13, The main body 11 and the valve seat member 14, and the valve seat member 14 and the second joint 16 are integrated. In this case, since it is not necessary to use a flux together, post-treatment for that purpose can be completely eliminated.

  Finally, the compression spring 22, the valve body 18 and the plunger 17, the buffer member 32, and the plug 31 are sequentially inserted from the opening end side of the small diameter portion 11 a, and the small diameter portion is sealed and sealed between the opening end of the small diameter portion 11 a and the plug 31. This is integrated with the part 11a. Finally, the casing 47 is fitted into the small-diameter portion 11a, and is integrally fixed to the plug 31 with the bolt 46, whereby the dehumidifying throttle valve 10 of the present embodiment is completed.

  When the spring receiver 21 is brazed to the step portion 11b of the main body 11 as described above, an annular solid brazing material is placed on the outer peripheral edge of the flange portion 21a, and the valve seat member 14 and the first and first The two joints 13 and 16 can be brazed together in the furnace.

  During the dehumidifying operation using the dehumidifying throttle valve 10, the electromagnetic coil 43 is conducted, the valve body 18 is biased toward the second joint 16 against the spring force of the compression spring 22, and the port plate 36 is The valve 14 is brought into contact with the seat 14a to be in the closed state shown in FIG. Along with this, the gas-liquid two-phase refrigerant flowing from the first joint 13 into the valve chamber 20 of the main body 11 flows from the first port 37 to the outer peripheral portion of the gap 34 and proceeds radially inward from here. The air bubbles are gradually compressed, and large bubbles are subdivided and flow into the central throttle passage 39, where they are further compressed, and a predetermined flow rate of refrigerant is guided to the second joint 16 side. The refrigerant guided from the throttle passage 39 to the gap 38 radially expands radially outward, but since the gap 38 is narrow, its rapid expansion is suppressed and the refrigerant expands gently. It flows out to the second joint 16. As a result, noise generated with the expansion of the bubbles can be suppressed to a low level.

  Note that, in a flow path in which two phases of gas and liquid are mixed, there is a possibility that bubbles are fixed to the inner wall of the flow path and the cross-sectional area of the flow path is substantially narrowed, thereby impairing the smooth flow of the refrigerant. In the embodiment, since the opening end of the second port 40 facing the second joint 16 is open close to the inner wall of the second joint 16, the refrigerant flows out from the second port 40 to the second joint 16. Has the effect of causing the bubbles attached to the inner wall of the second joint 16 to flow.

  In the above-described embodiment, the throttle valve 10 for dehumidification of the air conditioner is used. However, it can be applied to an expansion valve, and is particularly useful as a throttle device for a refrigerant flow path in a refrigeration cycle. However, it goes without saying that the valve device according to the present invention can be applied to a general on-off valve that opens and closes a flow path other than these throttle devices.

It is sectional drawing showing the internal structure of one Embodiment which applied the valve apparatus by this invention to the throttle valve for dehumidification of an air conditioning apparatus. FIG. 2 is an extracted enlarged cross-sectional view of the main part of the dehumidifying throttle valve shown in FIG. 1, showing a closed state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dehumidifying throttle valve 11 Main body 11a Small diameter part 11b Step part 11c Large diameter part 12 Joint joint hole 13 First joint 14 Valve seat member 14a Valve seat part 14b Joint holding part 15 Open end part 16 Second joint 17 Plunger 18 Valve body 19 Valve body driving means 20 Valve chamber 21 Spring receiver 21a Flange portion 21b Guide portion 22 Compression spring 23 Solenoid unit 24 Caulking portion 25 Brazing portion 26 Inner positioning projection 27 Outer positioning projection 28, 29 Brazing portion 30 Caulking portion 31 Plug 32 Buffer member 33 Valve rod 33a Flange portion 33b Step portion 34 Gap 35 Throttle plate 36 Port plate 37 First port 38 Gap 39 Throttle passage 40 Second port 41 Filter 42 Color 43 Electromagnetic coil 44 Bobbin 45 Sealing resin 46 Bolt 47 Casing Z By the first joint Extending region along the longitudinal direction of the first joint of the refrigerant passage is made

Claims (6)

A small-diameter portion and a large-diameter portion connected to the small-diameter portion via a step portion, and a tubular main body having a joint joint hole formed in the large-diameter portion;
A first joint having a cylindrical shape that is inserted into the joint joint hole and joined to the large diameter portion so as to protrude from the large diameter portion;
It has a valve seat part and a cylindrical joint holding part that follows, and the outer peripheral edge part is joined to the opening end part of the large-diameter part so that they are aligned with the longitudinal axis of the main body. An annular valve seat member;
A second joint having a cylindrical shape joined to the joint holding portion in a state of being fitted thereto;
A valve body that has a plunger that is slidably fitted to the small-diameter portion, and projects from the plunger so as to face the valve seat portion, and can open and close the valve seat portion;
An annular spring receiver fixed to the stepped portion, and a compression spring that is interposed between the spring receiver and the plunger and biases the valve body away from the valve seat portion, And a valve body driving means for opening and closing the valve body. The valve device according to claim 1 , wherein the large-diameter portion further includes a caulking portion for fixing the spring receiver to the main body. The first joint, the valve device according to claim 1 or claim 2 characterized in that it has a positioning means which can engage bulges from the outer peripheral surface on the opening edge of the joint faying hole. The large diameter portion, of claims 1 to 3, characterized by further comprising a positioning means for the outer peripheral edge of the bulges the valve seat portion can be locked from the inner peripheral surface at its open end The valve apparatus in any one. A method for manufacturing a valve device according to any one of claims 1 to 4 , wherein the cylindrical body is press-molded;
Forming a joint joint hole in the large diameter portion of the main body;
Pressing the annular valve seat member;
A first joint that forms a cylinder is inserted into the joint joint hole, the valve seat member is inserted into an opening end of the large-diameter portion, and a second joint that forms a cylinder is inserted into the joint holding portion, Brazing them together in a furnace in a state where the valve seat member and the first and second joints are respectively positioned with respect to the main body;
And a step of incorporating a valve body into the main body from the small diameter portion side. 6. The method according to claim 5 , further comprising the step of incorporating an annular spring receiver in the step portion of the main body prior to brazing in the furnace and fixing the large diameter portion to the main body by caulking the large diameter portion. Method for manufacturing the valve device.

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