CN1920354B - Valve device and manufacturing method thereof - Google Patents

Abstract

The present invention provides a valve device comprising: a cylindrical main body having a small diameter part and a large diameter part connected to the small diameter part through a step part, and a joint engaging hole is formed on the large diameter part; In the joint engaging hole, the first joint engaged with the large-diameter portion; has a valve seat portion and a cylindrical joint holding portion connected thereto, and an annular valve seat whose outer peripheral portion is joined to the opening end portion of the large-diameter portion Components; a second joint engaged with the joint holding part in a fitted state; a plunger having a freely slidable fit with the small diameter part, protruding from the plunger in a manner opposite to the valve seat part, and facing the valve seat part a valve body for switching; and a valve body driving mechanism for switching and driving the valve body.

Description

Valve device and manufacturing method thereof

technical field

The invention relates to a valve device which is easy to manufacture.

Background technique

An example of an electromagnetic switch valve that switches a fluid flow path is disclosed in JP-A-2004-092664. The solenoid valve includes: a valve body, a plunger, an attractor, a valve body, a seat forming member, a seat, a coil spring, and an electromagnetic coil. The valve body made of stainless steel has a cylindrical shape with one end closed. The plunger is slidably accommodated at one end of the valve main body. The attractor is fitted into the central portion of the valve main body in such a manner as to face the plunger. The valve body passes through the suction piece and is connected with the plunger. The valve seat forming member made of stainless steel plugs the opening at the other end of the valve main body. The valve seat formed on the seat forming member and opened and closed by the valve body and the coil spring disposed between the plunger and the attractor generate force to separate the valve body from the valve seat. The electromagnetic coil excites the attracting member, so that the valve body overcomes the elastic force of the coil spring to plug the valve seat.

Japanese Unexamined Patent Application Publication No. 2002-139169 discloses a solenoid valve including a valve main body, a cylindrical plunger, a valve body, an attractor, a spring, and a solenoid coil. One end of the valve main body is bent inward to form a cylindrical shape forming a valve seat. A cylindrical plunger is slidably accommodated at one end of the valve body. The front end portion of the valve body held by the plunger can open and close the valve seat portion. The suction piece is fitted into the valve main body so as to plug the opening at the other end of the valve main body. A spring is installed between the attractor and the base end of the valve body, and applies elastic force to the valve body to plug the valve seat. The electromagnetic coil excites the attracting member, so that the valve body overcomes the elastic force of the spring and opens the valve seat.

The conventional solenoid valve disclosed in JP-A-2004-092664 has a cylindrical shape with one end of the valve main body closed. Therefore, after the plunger, the valve body integrated with it, the suction member and the coil spring, etc. are loaded into the valve body in advance, it is necessary to TIG-weld the valve seat forming part on the valve body to plug the other end of the valve body. Open your mouth. Therefore, there are large restrictions on assembly and a complicated manufacturing process is required. In addition, since a pair of copper pipes connected to the piping are respectively brazed to the valve main body and the valve seat forming member, it needs to be performed separately from the operation of TIG welding the valve seat forming member to the valve main body, thus reducing the number of operating steps. and manufacturing costs increase.

In the solenoid valve disclosed in Japanese Patent Laid-Open No. 2002-139169, a pair of joints connected to piping can be brazed to the valve body, and the plunger, valve body and spring can be accommodated in the valve body, and then the suction member can be inserted into the valve body. The other end of the valve body is riveted into one. Therefore, compared with JP-A-2004-092664, it can manufacture easily. The valve body disclosed in JP-A-2002-139169 is effective when the flow rate of the fluid flowing through the pair of joints is small. However, as the inner diameter of the joint increases, the volume of the valve chamber formed in the valve body needs to be increased. Therefore, there is a disadvantage that the inner diameter of the valve body becomes larger than necessary and the weight of the entire valve device increases.

Contents of the invention

The object of the present invention is to provide a valve device which is easy to manufacture and assemble, and which can avoid unnecessary enlargement of the valve main body and miniaturize the entire device even if a large-diameter joint capable of passing a large amount of fluid is installed, and the valve device. manufacturing method.

A first aspect of the present invention capable of achieving this object is a valve device characterized by comprising: a small-diameter portion and a large-diameter portion connected to the small-diameter portion through a step portion, and a large diameter portion is formed on the large-diameter portion. A joint engaging hole, made into a cylindrical main body; inserted into the above-mentioned joint engaging hole, engaged with the large-diameter portion in a manner protruding from the above-mentioned large-diameter portion, and made into a cylindrical first joint; having a valve seat portion and connecting therewith A cylindrical joint holding portion, an annular valve seat in which the outer peripheral portion is engaged with the opening end of the large-diameter portion so that the valve seat portion and the joint holding portion are aligned with the longitudinal axis of the main body Components; engaged with the above-mentioned joint holding part in a fitted state and made into a cylindrical second joint; having a plunger that is freely slidably fitted with the above-mentioned small-diameter part, and is moved from the valve seat in a manner opposed to the above-mentioned valve seat. a valve body capable of opening and closing the above-mentioned valve seat portion protruding from the plunger; and a valve body driving mechanism for opening and closing the valve body.

In the present invention, the valve body drive mechanism is operated to guide the plunger integrated with the valve body into the small diameter portion, and the valve seat portion is opened and closed by the valve body to switch the movement of the fluid between the first joint and the second joint. or cessation of fluid movement. In this valve device, the first joint, the valve seat member and the main body are integrally joined together, and the second joint and the valve seat member are integrally joined together. The valve body is accommodated from the opening end side of the small diameter portion toward the large diameter portion side.

According to the valve device of the first aspect of the present invention, the main body, the first joint, the valve seat member, and the second joint can be joined together, and after they are joined, the valve body and the plunger can be joined together on the opening end side of the small diameter portion. inserted into the body. Therefore, the valve device is easy to manufacture and assemble, and its manufacturing cost can be reduced. In addition, it is only necessary to change the size of the large-diameter portion in accordance with the diameters of the first and second joints, and it is not necessary to change the diameter of the small-diameter portion. Therefore, it is possible to reduce the size and weight of the entire valve device.

In the valve device of the first aspect of the present invention, the valve body driving mechanism may have: an annular spring bracket fixed on the stepped portion; A compression spring that exerts elastic force in a partial manner. In this case, the large diameter portion can have a rivet for fastening the spring support to the main body. This eliminates the need for additional parts for fixing the spring bracket to the main body, and can suppress an increase in the weight of the valve device.

The first joint may have a positioning mechanism protruding from its outer peripheral surface and capable of locking with the edge of the opening end of the joint engaging hole. In this case, the jig for maintaining the relative position of the main body and the first joint when they are engaged can be omitted or simplified, thereby further simplifying the manufacturing process.

The large-diameter portion may further have an alignment mechanism that bulges out from the inner peripheral surface at the opening end thereof and can be engaged with the outer peripheral portion of the valve seat portion. In this case, it is possible to omit or simplify the jig for maintaining the relative position of the main body and the valve seat member when they are joined, so that the manufacturing process can be further simplified.

The main body and the first joint, the main body and the valve seat part, and the valve seat part and the second joint may be joined together by furnace brazing, respectively. In this case, all the engaging operations in the valve device can be performed simultaneously, so that the operability thereof can be improved.

A second aspect of the present invention is the method for manufacturing a valve device according to the first aspect of the present invention, comprising: a step of pressurizing a cylindrical main body; and a step of forming a joint engaging hole in a large-diameter portion of the main body. ; A process of pressure-forming an annular valve seat member; inserting the cylindrical first joint into the above-mentioned joint engaging hole, inserting the above-mentioned valve seat member into the opening end of the above-mentioned large-diameter portion, and then making the cylindrical The second joint of the shape is inserted into the above-mentioned joint holding part, in the state where the above-mentioned valve seat member and the above-mentioned first and second joints are respectively positioned relative to the above-mentioned main body, and they are brazed in a furnace together. The process of inserting the body into the main body from the small diameter portion side.

In the present invention, from a sheet material, a pipe material, or a preform formed into a predetermined shape close to the shape of the main body, a cylindrical shape having a small diameter portion and a large diameter portion connected to the small diameter portion through a stepped portion is press-molded. The main body, and a joint engaging hole is formed on the large diameter portion of the main body. An annular valve seat member having a valve seat portion and a cylindrical joint holding portion connected thereto is further press-molded. Next, insert the valve seat member into the opening end of the large-diameter portion, and insert the cylindrical second joint into the joint holding portion of the valve seat member so that the valve seat portion and the joint holding portion of the valve seat member It is in a straight line with the longitudinal axis of the main body. Further, the first joint made into a cylindrical shape is inserted into the joint engaging hole. Next, the valve seat member and the first and second joints are furnace-brazed together in a state where they are respectively positioned relative to the main body. Then, insert the valve body into the main body from the small diameter portion side.

According to the method of manufacturing a valve device according to the second aspect of the present invention, after the main body, the first joint, the valve seat member, and the second joint are joined together, the valve body and the plunger can be inserted into the main body from the opening end side of the small diameter portion. . Therefore, the valve device is easy to manufacture and assemble, and its manufacturing cost can be reduced. In addition, it is only necessary to change the size of the large-diameter portion in accordance with 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 overall size of the valve device can be reduced.

In the manufacturing method of the valve device according to the second aspect of the present invention, it may further include: before brazing in the furnace, insert the ring-shaped spring support into the stepped part of the main body, and fix it to the main body by riveting the large-diameter part on the process. In this case, an additional component for fixing the spring bracket to the main body is unnecessary, and an increase in the weight of the valve device can be suppressed.

Description of drawings

FIG. 1 is a cross-sectional view showing an internal structure of an embodiment of a throttle valve for dehumidification in which a valve device according to the present invention is applied to an air-conditioning apparatus.

Fig. 2 is an extracted enlarged cross-sectional view of main parts of the throttle valve for dehumidification shown in Fig. 1 , showing a valve closed state.

Detailed ways

Referring to FIG. 1 showing its overall cross-sectional structure and FIG. 2 in which main parts of the valve body are extracted and enlarged, an embodiment of a throttle valve for dehumidification in which the valve device of the present invention is applied to an air-conditioning device will be described in detail. . The present invention is not limited to such embodiments, and all changes and modifications included in the concept of the present invention described in the claims are possible, so it is of course also applicable to other arbitrary technologies belonging to the gist of the present invention.

The dehumidification throttle valve 10 of the present embodiment is a so-called normally open electromagnetically driven valve that is in an open state when no power is applied. The throttle valve 10 for dehumidification includes: a cylindrical main body 11, a cylindrical first joint 13, an annular valve seat member 14, a cylindrical second joint 16, a valve body 18, and A valve body drive mechanism 19 that drives the valve body 18 to open and close. The main body 11 has a small-diameter portion 11a and a large-diameter portion 11c connected to the small-diameter portion 11a by a stepped portion 11b. A first joint 13 formed of a copper pipe is inserted into a joint engaging hole 12 formed on the large-diameter portion 11 c of the main body 11 . The valve seat member 14 has a valve seat portion 14a and a cylindrical joint holding portion 14b connected thereto, and its outer peripheral portion is joined to the opening end portion 15 of the large diameter portion 11c. The second joint 16 formed of a copper tube is joined to the joint holding portion 14 b of the valve seat member 14 in a state of being fitted thereto. The valve body 18 has a plunger 17 slidably fitted into the small-diameter portion 11a, protrudes from the plunger 17 so as to face the valve seat portion 14a, and can open and close the valve seat portion 14a.

Refrigerant circulation piping (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 are in a communication state through the valve chamber 20 formed in the large-diameter portion 11c. On the contrary, at the closed position shown in FIG. 2 where the valve body 18 is pressed against the valve seat portion 14a, the first joint 13 and the second joint 16 communicate through a throttle device inserted into the valve body 18 which will be described later.

The valve body driving mechanism 19 of the present embodiment includes an annular spring holder 21 , a compression spring 22 that applies elastic force to separate the valve body 18 from the valve seat portion 14 a , and a solenoid unit 23 . The spring bracket 21 is fixed on the stepped portion 11 b of the main body 11 . A compression spring 22 is installed between the spring bracket 21 and the plunger 17, and exerts elastic force to make the valve body 18 leave the valve seat portion 14a. The solenoid unit 23 attached to the main body 11 drives the valve body 18 to the valve seat portion 14 a side against the elastic force of the compression spring 22 .

In addition, the main body 11 of the present embodiment is formed by press-forming a circular stainless steel plate having a predetermined diameter and thickness, and is in a state where the flange portion 21a of the spring bracket 21 is in contact with the stepped portion 11b. The spring holder 21 formed of disc-shaped stainless steel or the like has: the above-mentioned annular flange portion 21a; Guide part 21b. The flange portion 21a of the spring bracket 21 is pressed against the stepped portion 11b by the caulking portion 24 formed by denting a part of the large-diameter portion 11c close to the stepped portion 11b toward the inner peripheral side, and is integrally formed with the main body 11. fixed. The guide portion 21b of the spring support 21 can suppress the unstable movement of the valve body 18 that would occur during movement, thereby achieving stable movement. In addition, in the valve-open state shown in FIG. 1 , by surrounding the front end portion of the valve body 18 (the outer peripheral portion of the port plate 36 described later), it is possible to suppress the friction between the first joint 13 and the second joint 16 . Vibration caused by the flow of refrigerant and noise associated with it. Furthermore, it is also possible to suppress the disadvantage that the valve body 18 moves toward the valve seat portion 14a due to the flow of the refrigerant, thereby destabilizing the flow of the refrigerant.

In addition, the main body 11 can also be formed from a stainless steel pipe having a predetermined thickness and diameter by press molding. In the case of fixing the spring bracket 21 on the large-diameter portion 11c of the main body 11, the above-mentioned riveting may not be used, but spot welding or the first joint 13, the valve seat member 14 and the second joint 16 may be used for furnace brazing together. welding etc. to join.

The first joint 13 protrudes radially outward (right side in the drawing) from the large-diameter portion 11c, and is joined to the large-diameter portion 11c via a brazing portion 25 . On the first joint 13, a pair of inner positioning protrusions 26 protruding outward in the circumferential direction and capable of engaging with the opening end edge of the joint engaging hole 12 on the inner wall side of the large-diameter portion 11c are formed at a distance of 180°. A pair of outer positioning protrusions 27 that are shifted in phase by 90° with respect to the pair of inner positioning protrusions 26 are formed at a distance of 180°. The pair of outer positioning protrusions 27 can be engaged with the opening end edge of the joint engaging hole 12 on the outer wall side of the large-diameter portion 11c. That is, the fitting position of the first joint 13 is restricted in a state where the joint engaging hole 12 of the large-diameter portion 11 c is sandwiched by the two pairs of positioning protrusions 26 , 27 . In this case, note that when the first joint 13 is inserted into the joint engaging hole 12 , portions of the pair of inside positioning protrusions 26 are brought into a press-fit state with respect to the joint engaging hole 12 .

However, it is not necessary to clamp the joint engaging hole 12 with two pairs of positioning protrusions 26, 27, and to form the positioning protrusions 26, 27 at equal intervals along the circumferential direction of the first joint. The positioning projections 26 and 27 only need to be able to define the posture of the first joint 13 with respect to the joint engaging hole 12 of the large-diameter portion 11c. Positioning protrusions are also effective. In this case, the alignment operation can be easily and quickly performed.

The valve seat member 14 made of disc-shaped stainless steel is joined to the large-diameter portion 11c of the main body 11 through the brazing portion 28 so that the valve seat portion 14a and the joint holding portion 14b are aligned with the longitudinal axis of the main body 11. shape. In addition, the second joint 16 is joined to the joint holding portion 14 b of the valve seat member 14 through the brazing portion 29 such that its longitudinal axis is also aligned with the longitudinal axis of the main body 11 . In this embodiment, on the opening end 15 of the large-diameter portion 11c, a plurality of protrusions protruding radially inward from the inner peripheral wall of the large-diameter portion 11c to restrict the insertion position of the valve seat member 14 relative to the large-diameter portion 11c are formed. Riveting part 30. Thereby, the positioning of the valve seat member 14 with respect to the opening end of the large diameter part 11c of the main body 11 can be performed easily.

Certainly other components other than the above-mentioned positioning protrusions 26 , 27 and the riveting portion 30 may also be used to restrict the relative positions of the first joint 13 and the valve seat component 14 relative to the main body 11 .

The large-diameter portion 11c is sandwiched between the small-diameter portion 11a and the second joint 16, the small-diameter portion 11a is located on the opposite side of the second joint 16, and a plug 31 plugging the open end of the small-diameter portion 11a is tightly fitted. The opening end side (upper side in FIG. 1 ) of the small-diameter portion 11a. The plunger 17 has a cup-shaped cross section into which the front end of the plug 31 can be inserted, and an annular cushioning member 32 capable of contacting the front end of the plug 31 is accommodated at the bottom of the plunger 17 .

The valve body 18 has: a valve rod 33 having a flange portion 33 a formed at its tip; an orifice plate 35 overlapping on the front end surface of the valve rod 33 via a film-like gap 34 ; and a port plate 36 . The base end of the valve rod 33 is riveted integrally with the bottom of the plunger 17 . The outer peripheral portion of the port plate 36 is caulked to the outer peripheral portion of the flange portion 33 a of the valve rod 33 with the throttle plate 35 sandwiched therebetween. A plurality of first ports 37 communicating with the gap 34 between the throttle plate 35 are formed on the outer peripheral side of the flange portion 33 a. At the center of the throttle plate 35 , a throttle passage 39 is formed that communicates the above-mentioned gap 34 with the film-like gap 38 formed between the throttle plate 35 and the port plate 36 . A plurality of second ports 40 communicating with the gap 38 between the throttle plate 35 are formed on the outer peripheral side of the port plate 36 whose outer periphery becomes a conical surface tapered toward the valve seat portion 14 a. The portion including the above-mentioned throttle passage 39 up to the first and second ports 37, 40 before and after it constitutes the above-mentioned throttle means.

The thickness of the gap 34 along the reciprocating direction of the valve rod 33 , that is, the distance between the front end surface of the valve rod 33 and the surface of the throttle plate 35 facing thereto, is set narrower than the inner diameter of the throttle passage 39 . Likewise, the thickness of the gap 38 along the reciprocating direction of the valve rod 33 , that is, the relative interval between the throttle plate 35 and the port plate 36 , is also set narrower than the inner diameter of the throttle passage 39 . Usually, it is preferable to set the thicknesses of the gaps 34 and 38 to be as narrow as about 1/4 of the inner diameter of the throttle passage 39 . The reason for this is that the change in the flow channel cross-sectional area of the fluid between the throttle passage 39 and the gaps 34 and 38 can be made smoothest. The two gaps 34 and 38 communicating with both sides of the throttle passage 39 form a slit-shaped refrigerant passage extending in a direction perpendicular to the axis of the throttle passage 39 . Therefore, the noise generated in the throttle passage 39 is less likely to propagate outward from the two gaps 34, 38, and good quietness can be obtained.

In this embodiment, the valve closing position shown in FIG. 2 where the conical outer peripheral surface of the port plate 36 at the front end of the valve rod 33 is in contact with the valve seat portion 14a is set, and the first port communicating with the first joint 13 side is set. The opening end of the port 37 is located in the extension area Z of the refrigerant passage formed by the first joint 13 along the length direction of the first joint 13 . Therefore, the flow direction of the fluid flowing between the first joint 13 and the first port 37 can be kept substantially linear without being strongly bent, thereby enabling noise reduction.

When fine foreign matter or the like is mixed in the refrigerant passing through the throttle valve 10 for dehumidification, such foreign matter may block the first port 37 of the flange portion 33a, the throttle passage 39 formed in the throttle plate 35, or the port. The second port 40 of the board 36 . As a result, there is a possibility that the normal function of the throttle valve 10 for dehumidification cannot be performed. From this point of view, in the present embodiment, the cylindrical filter 41 is attached to the valve with one end side disposed so as to surround the outer peripheral portion of the flange portion 33a and integrally caulked with the flange portion 33a via the port plate 36 . Stick 33 on. The other end of the filter 41 is integrally embedded in a collar 42 tightly fitted on the stepped portion 33 b of the valve rod 33 , and the first port 37 and the first joint 13 are communicated through the filter 41 .

The structure and attachment method of the filter can be selected arbitrarily other than the present embodiment. Likewise, the structures of the valve body 18 and the above-mentioned throttling device are not directly related to the present invention, and other arbitrary structures can be adopted.

The solenoid unit 23 of the valve body 18 of this embodiment uses the electromagnetic coil 43 . That is, the solenoid unit 23 includes a bobbin 44 for accommodating the electromagnetic coil 43 and a frame-shaped case 47 fixed to the plug 31 by bolts 46 . The bobbin 44 is embedded in the case 47 with the electromagnetic coil 43 via the sealing resin 45 . An unillustrated cable led out from the electromagnetic coil 43 to the outside through the sealing resin 45 is connected to a power source through an on/off (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 side when energized.

As described above, between the bottom of the plunger 17 and the flange portion 21a of the spring holder 21, the compression spring 22 that applies elastic force to separate the valve body 18 from the valve seat portion 14a is incorporated. Therefore, when the electromagnetic coil 43 is not energized, the first joint 13 and the second joint 16 are communicated not through the valve body 18 but through the valve chamber 20 of the main body 11 as shown in FIG. 1 .

Such a throttle valve 10 for dehumidification can be manufactured as follows. First, the cylindrical main body 11 is press-formed several times from a stainless steel plate punched out into a circular shape with an appropriate diameter, and the joint engaging hole 12 is punched out in the large-diameter portion 11c of the main body 11 . The ring-shaped valve seat member 14 is press-formed from a disk-shaped plate material, and the valve seat portion 14a is punched out at the same time. Similarly, the spring holder 21 is obtained by pressing and forming a disk-shaped sheet material.

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

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

Then, the first joint 13 is inserted into the joint engaging hole 12, the valve seat member 14 is inserted into the opening end portion 15 of the large-diameter portion 11c, and the second joint 16 made in a cylindrical shape is inserted into the joint holding portion 14b. These joining portions are embedded with solid brazing material formed into a ring shape. Then, in the state where the valve seat member 14 and the first and second joints 13, 16 are respectively positioned relative to the main body 11, they are brazed together in a furnace, so that the main body 11 and the first joint 13, the main body 11 and the valve The seat member 14, the valve seat member 14, and the second joint 16 are integrated. In this case, flux (flux) does not need to be used at the same time, so post-processing can be completely omitted.

Finally, the compression spring 22, the valve body 18, the plunger 17, the cushioning member 32, and the plug 31 are sequentially inserted into the opening end side of the small diameter portion 11a, and the opening end of the small diameter portion 11a and the plug 31 are sealed and welded so that they are The small-diameter portion 11a is integrated. Finally, the housing 47 is fitted into the small-diameter portion 11a, and fixed integrally with the plug 31 by the bolt 46, thereby completing the dehumidification throttle valve 10 of this embodiment.

As described above, when the spring bracket 21 is brazed to the stepped portion 11b of the main body 11, the ring-shaped solid brazing material is placed on the outer peripheral portion of the flange portion 21a, and the valve seat member 14, the second One and second joints 13, 16 are furnace brazed together.

When using this dehumidification throttle valve 10 for dehumidification, the electromagnetic coil 43 conducts, the valve body 18 overcomes the elastic force of the compression spring 22, and applies a force to the second joint 16 side, and the port plate 36 contacts the valve seat portion 14a, forming a 2 shows the closed valve state. Along with this, the gas-liquid two-phase refrigerant flowing into the valve chamber 20 of the main body 11 from the first joint 13 flows into the outer peripheral portion of the gap 34 from the first port 37, and is gradually compressed as it enters the radially inner side from here. , the large air bubbles are divided and flow into the central throttling passage 39 . The refrigerant flowing into the throttle passage 39 is further compressed here, and a predetermined flow rate of refrigerant is guided to the second joint 16 side. The refrigerant introduced into the gap 38 from the throttle passage 39 spreads radially outward in the radial direction. In this case, since the clearance gap 38 is narrow, its rapid expansion is suppressed, and it expands slowly, and flows out from the second port 40 to the second joint 16 . As a result, it is possible to suppress the generation of noise accompanying the bubble expansion to a low level.

In the flow path where the gas-liquid two-phase is mixed, the air bubbles are fixed on the inner wall of the flow path, and the cross-sectional area of the flow path is substantially narrowed, possibly impairing the smooth flow of the refrigerant. However, in the present embodiment, since the opening end of the second port 40 facing the second joint 16 side is opened close to the inner wall of the second joint 16, the refrigerant flowing out from the second port 40 into the second joint 16 has The effect of making air bubbles attached to the inner wall of the second joint 16 flow.

In the above-mentioned embodiment, it is used as the throttle valve 10 for dehumidification of an air-conditioning apparatus, but it can also be applied to an expansion valve, and it is especially useful as a throttle device of a refrigerant|coolant flow path of a refrigerating cycle. However, the valve device of the present invention can be applied not only to these throttling devices but also to general on-off valves for opening and closing flow paths.

Claims (7)

1. a control valve unit is characterized in that, comprising:

Have minor diameter, from the mode stepped part that form and the large-diameter portion that by this stepped part with described minor diameter be connected of this minor diameter with enlarged-diameter, on this large-diameter portion, be formed with the connector engages hole, make cylindrical main body;

Insert in the described connector engages hole,, make first joint of tubular to engage with this large-diameter portion from the outstanding mode of described large-diameter portion;

Have seat portion and the coupled joint holding part of making tubular, outer peripheral portion engages with the open end of described large-diameter portion, makes the length-wise axis valve base part of the ring-type of shape in line of described seat portion and described joint holding part and described main body;

Engage under chimeric state with described joint holding part, make second joint of tubular;

Have be free to slide the plunger chimeric with described minor diameter, outstanding in the mode relative from this plunger with described seat portion, can carry out the valve body of switch to described seat portion; With

This valve body is carried out the valve body driving mechanism of switch drive,

Described valve body driving mechanism has: the spring bracket that is fixed on the ring-type on the described stepped part; And be installed between this spring bracket and the described plunger, so that described valve body leaves the pressure spring that the mode of described seat portion applies elastic force.

2. control valve unit as claimed in claim 1 is characterized in that:

Described large-diameter portion also has and is used for described spring bracket is fixed on caulking part on the described main body.

3. control valve unit as claimed in claim 1 is characterized in that:

Described first joint has from its outer circumferential face bulging, the positioning means that can end with the open end edge card in described connector engages hole.

4. control valve unit as claimed in claim 1 is characterized in that:

Described large-diameter portion also has at its open end from inner peripheral surface bulging, the position registration mechanism that can end with the outer peripheral portion card of described seat portion.

5. control valve unit as claimed in claim 1 is characterized in that:

Described main body and described first joint, described main body and described valve base part, described valve base part and described second joint engage together by furnace brazing respectively.

6. manufacture method of making each described control valve unit in the claim 1～5 is characterized in that having:

The operation of press molding cylindrical main body;

On the large-diameter portion of described main body, form the operation in connector engages hole;

The operation of the valve base part of press molding ring-type;

First joint of making tubular is inserted in the described connector engages hole, described valve base part is inserted in the open end of described large-diameter portion, second joint that to make tubular again inserts in the described joint holding part, with described valve base part and described first and second joints respectively under the state with respect to described main body location, the operation of together they being carried out furnace brazing; With

Valve body is inserted operation in the main body from described minor diameter side.

7. the manufacture method of control valve unit as claimed in claim 6 is characterized in that, also has:

Before furnace brazing, the spring bracket of ring-type is inserted in the stepped part of described main body, be fixed in operation on the main body by riveting described large-diameter portion.

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