JP4456623B2 - Normally open solenoid valve and air conditioner - Google Patents

Description

  The present invention relates to a normally open type electromagnetic valve and an air conditioner, and in particular, a normally opened valve body is connected to a plunger of an electromagnetic solenoid device and opens and closes a valve port by movement of the plunger in the axial direction. The present invention relates to a type solenoid valve and an air conditioner.

  In this type of solenoid valve, the valve body is pulled away from the valve seat around the valve port when the valve is open, and the tip end side is in an unsupported state and is located in the valve chamber of the valve housing. For this reason, the valve body is affected by the fluid flow that flows through the valve chamber when the valve is open, and if there is a turbulent flow in the fluid flow, the valve body may be vibrated and resonated, causing noise such as ringing. is there. In an air conditioner to which such a solenoid valve is applied, the rotational speed of the compressor at the start of the cooling operation should reach the maximum rotational speed immediately after the operation so that the cool air is blown out as soon as possible. Since the speed is controlled, an unstable refrigerant flow state is likely to occur, and in such a transient flow state, the valve-opened electromagnetic valve is likely to ring. In particular, in a normally open type electromagnetic valve in which the valve body is pushed up by the spring force of the spring and is positioned in the valve open position, the valve body is only supported by the spring when the valve is open. A vibration system with no damping and a spring constant is established, and the valve body is likely to resonate under the influence of the fluid flow.

  Therefore, the fluid flow (turbulent flow) in the valve chamber is not directly applied to the valve body, and the excitation force due to the fluid flow acting on the valve body is reduced. Some are surrounded by a member (see, for example, Patent Document 1).

In this type of solenoid valve, the valve housing is made of brass, and the valve housing has a first inlet / outlet port that is always in direct communication with the valve chamber, and a first inlet / outlet port that is always in direct communication. And a second inlet / outlet port communicating with the valve chamber via the valve port, and a valve seat portion is defined around the open end of the valve port on the valve chamber side. . First and second copper joint pipes are hermetically joined to the first and second inlet / outlet ports by brazing, respectively. Also, the valve housing defines a plunger Help plunger chamber is fitted movably in the axial direction of the electromagnetic solenoid unit coupled to a valve body of a valve chamber therein, a coil portion of the electromagnetic solenoid apparatus around the periphery A cylindrical stainless steel plunger tube to which is fixed is fixed by brazing. In the plunger tube, a plunger spring (valve opening spring) by a compression coil spring that constantly biases the plunger in the valve opening direction with respect to the valve housing is housed, and when the electromagnetic coil portion is not energized, The valve body is driven in the valve opening direction together with the plunger by the spring force of the plunger spring, and when energized, the plunger is magnetically attracted against the spring force of the plunger spring, thereby driving the valve body in the valve closing direction. A normally open solenoid valve is constructed.

  However, this normally open solenoid valve requires the use of flux to braze the first and second copper joint tubes and the stainless steel plunger tube to the brass valve housing. In addition to high management costs, the use of a large amount of flux may adversely affect the natural environment. In addition, since pickling is performed as a post-treatment for flux removal and oxide scale removal, a work place, a large amount of treated water, fuel, acidic and alkaline solvents are required, and further away for management of the work environment. Since it is performed at a place, there is a need for a storage place to be reserved as an intermediate part (in-process part), which hinders improvement of productivity. Furthermore, depending on the method of processing, the surface of the parts may be deteriorated or foreign substances may not be completely removed, which may adversely affect the performance of the solenoid valve (reliability). As described above, in the normally open type solenoid valve configured using the brass valve housing, the number of parts, the number of processes, and the weight are also increased.

As a solenoid valve that eliminates the need to use flux for brazing and reduces the number of parts, the number of processes, and the weight by using pressed parts, a stainless steel valve housing formed into a tube shape, A first joint and a second joint attached to the valve housing; a plunger provided in the valve housing; a valve body provided in the plunger; And a plunger spring provided between the valve body and the suction element, and the plunger spring connects the valve body to the valve housing of the first joint. There is one that is urged in the direction of the valve seat formed at the mounting end with respect to (for example, see Patent Document 2).
JP 2004-239358 A JP 2002-139169 A

  In the electromagnetic valve described in Patent Document 2 described above, the valve element is driven in the valve closing direction together with the plunger by the spring force of the plunger spring when the electromagnetic coil portion is not energized, and when energized, the plunger is Since the valve body is normally closed and is driven in the valve opening direction by being magnetically attracted against the spring force of the plunger spring, in the valve open state that may be affected by the fluid flow, Since the valve body is held by being pressed by the compressed plunger spring in the plunger that is attracted and held by the magnetic attraction force, the valve body is not vibrated by the turbulence of the fluid flow. There is no need to provide a collar member that surrounds the outer periphery on the distal end side of the valve body in the state.

  Therefore, the electromagnetic valve described in Patent Document 2 has a configuration in which it is not necessary to use a flux for brazing, but the electromagnetic valve described in Patent Document 2 does not necessarily require a collar member. Since it is a closed type, even if the configuration of the solenoid valve of Patent Document 2 is applied to the normally open solenoid valve according to the present invention as it is, it is possible to obtain a normally open solenoid valve that does not require the use of flux for brazing. Can not.

  Therefore, in view of the present situation described above, the present invention can reduce the excitation force caused by the fluid flow acting on the valve body so that the fluid flow (turbulent flow) in the valve chamber does not directly hit the valve body, and brazing can be performed. An object of the present invention is to provide a normally open solenoid valve that eliminates the need to use flux.

The normally open solenoid valve according to claim 1, which has been made to solve the above-mentioned problems, connects a valve body disposed in a valve chamber to a plunger of an electromagnetic solenoid device disposed in the plunger chamber, and connects the valve body to the plunger. When the coil of the electromagnetic solenoid device is not energized, the valve body positioned at the valve open position by the spring biasing force of the movable end of the plunger spring is A normally open electromagnetic valve that magnetically attracts the plunger against a spring biasing force of a plunger spring to drive the plunger to a valve closed position, and defines a small-diameter portion that defines the plunger chamber and the valve chamber A plunger tube / valve body comprising a stainless steel stepped circular tube having a large diameter portion and a stepped portion connecting the small diameter portion and the large diameter portion; A spring receiving and surrounding member made of stainless steel that surrounds the outer periphery of the tip of the valve body in the valve open position is positioned so as to follow the stepped surface in the circular tube of the stepped portion. The first copper joint pipe is fixed in the atmosphere furnace in the atmosphere furnace by a first port which is fixed by non-flux brazing in the atmosphere furnace and is always in communication with the valve chamber formed in the wall portion of the large diameter portion. And a valve chamber of the valve port provided between the second port and the valve chamber at the opening of the large-diameter portion. A stainless steel member having a valve seat formed around the open end on the side is hermetically bonded and fixed by flux-free brazing in an atmospheric furnace, and a second copper joint is fixed to the second port Flux-free brazing of tubes in an atmospheric furnace Connected are more sealed joint, the spring receiving and enclosing member is disposed between the large flat portions arranged at equal intervals with a diameter of the circular arc edge than the inner diameter of the diameter portion and two adjacent flat portions tongue When the flat part is imitated by welding by following the flat part on the step surface in the circular tube, the tongue-like rising part is brazed with no flux. The ring-shaped brazing material arranged along the arc edge of the flat portion is held at the meeting portion between the stepped surface in the circular tube and the inner peripheral surface of the large diameter portion .

According to the first aspect of the present invention, a stainless steel step having a small diameter portion that defines the plunger chamber, a large diameter portion that defines the valve chamber, and a step portion that connects the small diameter portion and the large diameter portion. Adopting a plunger tube / valve body consisting of a circular tube, and receiving a fixed end of the plunger spring as a spring, a spring receiving / enclosure member made of stainless steel surrounding the outer periphery of the tip of the valve body in the valve open position, It is positioned and fixed to follow the stepped surface in the circular tube of the stepped part by flux-free brazing in an atmospheric furnace, but the flat part and tongue-like rising part are provided on the flange of the spring receiving and surrounding member, and it is flat The parts are arranged at equal intervals with arc edges having a diameter smaller than the inner diameter of the large diameter part, the tongue-shaped rising part is arranged between two adjacent flat parts, and the flat part is made to follow the step surface in the circular tube, and the spring The receiving and surrounding member is temporarily fixed by welding. When in, rising portion of the tongue is associated portion of the inner peripheral surface of the flux-free brazing ring-shaped brazing material Pipe stepped surface and the large diameter portion arranged along a circular arc edge of the flat portion to be since it is held in, positioning and fixing of the spring receiving and enclosing member for pipe stepped surface of the stepped portion is arranged along an arc edge of the flat portion in a state of being modeled after pipe step surface It can be accurately performed by flux-free brazing of the ring-shaped brazing material in the atmosphere furnace, and the flux receiving brazing in the atmosphere furnace of the spring receiving and surrounding member to the stepped surface in the circular pipe of the stepped portion, A copper joint pipe for the first port, a stainless steel member having a second port, a valve port, and a valve seat for the large diameter opening, and a second copper joint pipe for the second port Flux-free brazing in an atmospheric furnace It can be carried out in conjunction with.

Normally open solenoid valve according to claim 2 is the normally open electromagnetic valve according to claim 1, wherein said spring receiving and surrounding member, the flange cylindrical portion from one end of the cylindrical portion integrally formed at the other end And a winding end of the fixed end of the plunger spring is seated on the leading edge of the folding portion .

According to the second aspect of the invention, the spring receiving and surrounding member, the flange has a folded portion folded back along the inner peripheral surface of the cylindrical portion from one end of the cylindrical portion integrally formed at the other end, since winding end of the fixed end of the plunger spring to the tip edge of該折return part is seated, the urging force of the plunger spring to plunger Ru granted to the valve opening direction.

An air conditioner according to a third aspect includes a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a refrigerant passage connecting these in a loop, and the outdoor heat. An expansion valve provided in a refrigerant passage between the exchanger and the first indoor heat exchanger, and connected between the first indoor heat exchanger and the second indoor heat exchanger. 3. The normally open solenoid valve according to Item 1 or 2, and a throttle passage that communicates the upstream side and the downstream side of the valve port when the normally open solenoid valve is closed.

  According to the invention described in claim 3, when the normally open solenoid valve is closed, the throttle passage performs a throttling action between the first indoor heat exchanger and the second indoor heat exchanger, and dehumidifies. Operation is performed.

According to the first aspect of the present invention, the fixed end of the plunger spring is received by the spring, and the stepped portion of the stainless steel spring receiving and surrounding member surrounding the outer periphery of the tip of the valve body at the valve open position Positioning and fixing with respect to the step surface is accurately performed by flux-free brazing in an atmosphere furnace of a ring-shaped brazing material arranged along the arc edge of the flat portion in a state imitating the step surface in the circular pipe . A stainless steel member having a second port, a valve port, and a valve seat portion with respect to the opening of the large-diameter portion, and a second copper fitting tube with respect to the second port. It can be performed together with flux-free brazing in an atmospheric furnace, and once brazed parts cannot be put into the brazing atmosphere again, all brazing joints are kept in good condition, valve The normally open electromagnetic that can reduce the excitation force caused by the fluid flow acting on the valve body by preventing the fluid flow (turbulent flow) from directly contacting the valve body, and eliminating the need to use flux for brazing A valve-open type can be provided.

According to the second aspect of the present invention, the biasing force of the plunger in the valve opening direction by the plunger spring is applied with reference to the leading edge of the folded portion of the spring receiving and surrounding member fixed to the stepped surface in the circular tube of the stepped portion. that has been.

  According to the invention of claim 3, the normally open solenoid valve in which the spring receiving and surrounding member is provided by flux-free brazing in an atmospheric furnace is provided in the indoor unit of the air conditioner, thereby It is possible to provide an air conditioner that does not cause annoying ringing in the cooling mode and the heating mode in which the electromagnetic valve is open.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are sectional views showing an embodiment of an electromagnetic valve according to the present invention. In the figure, the solenoid valve 10 has a small diameter portion 12a that defines the plunger chamber 11, a large diameter portion 12b that defines the valve chamber 13, and a step portion 12c that connects the small diameter portion 12a and the large diameter portion 12b. A plunger tube / valve body 12 made of a stainless steel stepped circular tube is provided. The large-diameter portion 12b of the plunger tube / valve body 12 is provided with a first inlet / outlet port 14 which is always in communication with the valve chamber 13 in the wall portion, and a stainless steel bowl in the opening portion. A bottomed cylindrical member 15 is provided.

  The bottomed tubular member 15 with a flange is a valve port provided between a tubular portion 15 a having an inner peripheral surface defining a second inlet / outlet port 16, and the valve chamber 13 and the second inlet / outlet port 16. 17 has a bottom portion 15b, and a flange portion 15c hermetically joined by non-flux brazing R in an atmospheric furnace in a state where the outer peripheral edge portion is press-fitted into the inner peripheral surface of the opening portion of the large-diameter portion 12b. . A valve seat 18 is defined around the open end of the valve port 17 on the valve chamber 13 side.

  A first copper joint pipe 19 is inserted into the first inlet / outlet port 14, and the insertion end of the first inlet / outlet port 14 is abutted against the outer peripheral surface of a cylindrical portion 22 </ b> A of a spring receiving and surrounding member 22, which will be described later. It is hermetically bonded and connected by flux-free brazing R in an atmospheric furnace. The second inlet / outlet port 16 has an atmosphere in a state where the second copper joint pipe 20 is inserted into the cylindrical portion 15a forming the port, and the insertion end is abutted against the bottom portion 15b and positioned. It is hermetically bonded and connected by flux-free brazing R in the furnace.

  A valve element 21 is provided in the valve chamber 13 so as to be movable in the axial direction of the plunger tube / valve body 12. The valve body 21 is seated on a valve seat portion 18 defined around the opening end of the valve port 17 on the valve chamber 13 side at the distal end outer peripheral surface 21A, and the valve closed position for closing the valve port 17 (position in FIG. 2). And a valve open position (position in FIG. 1) that is away from the valve seat portion 18 and establishes communication of the valve port 17.

  Components of the electromagnetic solenoid device 40 are arranged inside and outside the small diameter portion 12a of the plunger tube / valve body 12. The electromagnetic solenoid device 40 is of a type having no attractor, and is fitted to the plunger chamber 11 defined in the small diameter portion 12a of the plunger tube / valve body 12 so as to be movable in the axial direction of the plunger tube / valve body 12. The cup-shaped plunger 41 made of magnetic material, the plug member 42 made of magnetic material that is airtightly fixed to the opening tip of the small-diameter portion 12a by welding, and the plug 43 by bolts 43 outside the small-diameter portion 12a. The outer flange 44 made of a U-shaped magnetic material and a U-shaped outer cage 44 which are connected to each other are fixed to the outer periphery of the small-diameter portion 12a by the connection of the outer cage 44 to the plug member 42. An electromagnetic coil portion 45, and a plunger spring (valve opening spring) 46 by a compression coil spring that urges the plunger 41 toward the plug member 42, that is, in the valve opening direction. It is more configuration.

  The plunger chamber 11 in the small-diameter portion 12a and the valve chamber 13 in the large-diameter portion 12b communicate with each other, and the valve body 21 that exists across the plunger chamber 11 and the valve chamber 13 is in the plunger chamber 11 and the upper stem portion 21B. Are connected to the bottom of the plunger 41 by being integrated with the plunger 41 and moved integrally with the plunger 41 in the axial direction of the plunger tube / valve body 12.

  That is, as shown in FIG. 1, when the electromagnetic solenoid device 40 is not energized, the valve body 21 driven to the valve open position separated from the valve seat portion 18 by the spring force of the plunger spring 46 is shown in FIG. As shown in the figure, it is a normally open type in which the plunger 41 is magnetically attracted against the spring force of the plunger spring 46 and driven to a valve closing position where the plunger 41 is seated on the valve seat portion 18.

  The plunger tube / valve body 12 is made of stainless steel serving as a valve seat guide and a spring receiver that is positioned and fixed so as to follow the stepped surface 12d in the circular tube of the stepped portion 12c that connects the small diameter portion 12a and the large diameter portion 12b. The spring receiving and surrounding member 22 is fixed by flux-free brazing R in an atmospheric furnace. The spring receiving and surrounding member 22 is formed by press molding, and as shown in enlarged views in the partial sectional view of FIG. 3, the perspective view of FIG. 4, and the top view of FIG. 5, the cylindrical portion 22A and the cylindrical portion 22A It has a folded portion 22B folded from one end along the inner peripheral surface of the cylindrical portion 22A, and a flange 22C integrally formed at the other end.

  The spring receiving and surrounding member 22 is fixed by flux-free brazing R in an atmospheric furnace in a state where the flange 22C is temporarily fixed to the stepped surface 12d of the stepped portion 12c by, for example, spot welding. The cylindrical portion 22A and the folded portion 22B are located in the valve chamber 13 and surround the entire outer periphery of the tip 21C of the valve body 21 in the valve open state shown in FIG.

  As shown in FIG. 3, the spring receiving / surrounding member 22 has a tip edge of one end of the cylindrical portion 22 </ b> A whose tip edge is the valve open position so as not to obstruct the flow path in the valve chamber 13. Or the length of the cylindrical portion 22A is set so that the tip of the valve body 21 is slightly protruded. Specifically, the maximum protrusion amount of the valve body 21 from the distal end edge of the cylindrical portion 22A may be about 1.0 to 3.0 mm, preferably about 0.5 mm.

  A winding end of a fixed end, which is one end side of the plunger spring 46, is seated on the distal end edge 22B1 of the folded portion 22B of the spring receiving and surrounding member 22. The winding end of the movable end, which is the other end side of the plunger spring 46, is seated on the stepped portion 41 </ b> A outside the bottom of the cup-shaped plunger 41. With this configuration, the plunger 41 receives a biasing force toward the plug member 42 by the plunger spring 46 formed of a compression coil spring, and the folded portion 22B of the spring receiving and surrounding member 22 fixed to the stepped surface 12d in the circular tube of the stepped portion 12c. The tip edge 22B1 is used as a reference.

  More specifically, on the flange 22C of the spring receiving and surrounding member 22, four arc edges (about 30 °) smaller in diameter than the inner diameter of the large diameter portion 12b of the plunger tube / valve body 12 are arranged at equal intervals. A flat portion 22C1 in which the arc edge ends are connected by a straight line, and a tongue-shaped start-up that is inclined from the middle portion of the four straight edges of the flat portion 22C1 in the protruding direction of the cylindrical portion 22A A portion 22C2 is provided. In the illustrated example, four arc edges are provided. However, 3, 6 or 8 arc edges may be provided, and the angle at which the arc edges are provided can be changed according to the number of arc edges.

  The tongue-like rising portion 22C2 includes a large-diameter portion 12b of the plunger tube / valve body 12 and a spring receiving / enclosing member taken along the cross-sectional lines XX and YY in FIG. 6 and 7 showing the relationship 22, the free end 22C21 protrudes from the arc edge 22C11 of the flat portion 22C1 within a range not contacting the inner peripheral surface of the large diameter portion 12b. Note that the outer diameter of the arc edge 22C11 of the flat portion 22C1 and the rising amount of the tongue-shaped rising portion 22C2 are fixed when the flat portion 22C1 is fixed to follow the stepped surface 12d in the circular tube of the stepped portion 12c. The ring-shaped brazing material 25 before melting disposed along the arc edge 22C11 is held by the rising portion 22C2 at the meeting portion between the stepped surface in the circular tube of the stepped portion 12c and the inner peripheral surface of the large diameter portion 12b. It is said to be a big size.

  The valve body 21 is located immediately above the valve port 17, and a passage that connects the first inlet / outlet port 14 and the second inlet / outlet port 16 in the valve closed state is formed in the valve body 21. Most of this passage is provided by a hollow opening 21D that opens to the front end face (lower bottom face) facing the valve port 17. The hollow opening 21D opens (lower end opening) toward the valve port 17 at the distal end surface of the valve body 21, and forms a bottomed hole with the upper end closed.

  The valve body 21 has a small diameter portion 21E having a diameter in a range from the intermediate portion in the axial direction to the connecting end side (upper end side) with the plunger 41, which is smaller than the outer diameter of the tip portion 21C. Part 21F is formed. The valve body 21 is provided with a plurality of radial passages 21G communicating the upper end closed side of the hollow opening 21D and the outer peripheral surface of the small diameter portion 21E. Here, the above-mentioned passage is constituted by a hollow opening 21D and a radial passage 21G, and is a communication that connects the valve chamber 13, that is, the first inlet / outlet port 14 and the second inlet / outlet port 16 when the valve is closed. A passage, in other words, a communication passage that connects the upstream side and the downstream side of the valve port 17 is formed.

  A cylindrical filter element 26 made of a porous material for trapping contaminants is fitted and mounted on the outer peripheral portion of the small diameter portion 21E, and is held between the step portion 21F and the bottom portion of the plunger 41. Accordingly, the radial passage 21G communicates with the inner wall surface of the cylindrical filter element 26. The cylindrical filter element 26 captures contaminants and subdivides the gas particles in the gas-liquid mixed fluid. Even if the cylinder filter element 26 is clogged to some extent, the pressure loss in the filter does not become larger than the pressure loss due to the orifice member 28 described later. Required.

  A filter element 27 made of a porous body, an orifice member 28 having an orifice hole (throttle hole) 28A, and a filter element 29 made of a porous body are sequentially inserted into the hollow opening 21D from the lower end opening. It is fixed to the valve body 21 by caulking at the tip part forming the surface 21A.

  Next, the operation of the electromagnetic valve 10 configured as described above will be described. In a state where the electromagnetic solenoid device 40 is not energized, the valve body 21 is lifted together with the plunger 41 by the spring force of the plunger spring 46 as shown in FIG. A valve open state is obtained in which the valve port 17 is fully open and there is no substantial throttling action of full opening.

  When the valve is in the open state, the outer periphery of the distal end side (the distal end portion 21C) of the valve body 21 is surrounded by the cylindrical portion 22A of the spring receiving and surrounding member 22, so that the inside of the valve chamber 13 is connected to the valve port from the first inlet / outlet port 14. 17. The fluid flow (turbulent flow) flowing to the second inlet / outlet port 16 does not directly hit the valve body 21. Thereby, the excitation force by the fluid flow which acts on the valve body 21 reduces. As a result, the valve body 21 is hardly affected by the fluid flow in the valve chamber 13, and the valve body 21 is prevented from resonating and no ringing occurs.

  Further, since the valve body 21 is hardly affected by the fluid flow flowing through the valve chamber 13 by the spring receiving and surrounding member 22, the flow rate of this fluid flow increases, so that the valve body 21 is moved from the valve opening position to the valve closing direction. It becomes difficult to be affected by the suction phenomenon sucked into the valve, and it becomes unnecessary to increase the valve opening holding pressure by increasing the spring force of the plunger spring 46. As a result, the spring force of the plunger spring 46 can be reduced, and it becomes unnecessary to increase the ampere turn of the electromagnetic coil that drives the plunger against the spring force of the plunger spring 46. It does not have to be converted.

  When the electromagnetic solenoid device 40 is energized, the plunger 41 is magnetically attracted toward the lower piece 44A of the outer casing 44 against the spring force of the plunger spring 46, and the valve body 21 is moved in the valve closing direction. As shown in FIG. 2, the valve body 21 is driven and seated on the valve seat portion 18 with the tip outer peripheral surface 21 </ b> A.

  In this valve closed state, the valve chamber 13 and the second inlet / outlet port 16 communicate with each other through the cylindrical filter element 26, the radial passage 21G, the filter element 27, the orifice hole 28A of the orifice member 28, and the filter element 29. When the inlet / outlet port 14 is on the high pressure side and the second inlet / outlet port 16 is on the low pressure side, the cylindrical filter element 26 → the radial passage 21G → the filter element 27 → the orifice hole 28A of the orifice member 28 → the filter element A fluid such as a refrigerant flows in the order of 29.

  When the fluid flows as described above, first, a cylindrical filter element 26 having a large surface area captures contamination in the fluid flow and subdivides bubbles (gas particles) in the liquid flow. . Then, the fluid passes through the plurality of radial passages 21G, flows into the filter element 27 in a dispersed flow, and sequentially passes through the filter element 27, the orifice hole 28A of the orifice member 28, and the filter element 29. Thereby, a throttling effect is obtained by the orifice hole 28 </ b> A of the orifice member 28.

  When the solenoid valve 10 is closed, the fluid enters the small diameter portion 12a from the valve chamber 13 through the arrangement portion of the spring receiver / enclosure member 22 and flows to the cylindrical filter element 26. Therefore, the spring receiver / enclosure member 22 flows. The tip 21C of the valve body 21 moves largely from the folded portion 22B into the valve chamber 13 in the valve closed state so as not to cause a road obstruction, and between the inner circumferential surface of the folded portion 22B and the outer circumferential surface of the valve body 21. A flow path G is formed in the turbulent flow so as not to generate a turbulent flow that generates a fluid passing sound.

  Next, a method for assembling the solenoid valve will be described below. In assembly, first, after a ring-shaped brazing material is arranged at the meeting portion between the stepped portion 12c and the large diameter portion 12b of the plunger tube / valve body 12, the spring receiving / surrounding member 22 is attached to the plunger tube / valve body 12. The flat portion 22C1 of the flange 22C is set so as to be received by the stepped surface 12d in the circular tube of the stepped portion 12c.

  After that, by energizing between the spot welding electrodes with the stepped portion 12c and the flat portion 22C1 sandwiched therebetween, the joint surface between the stepped portion 12c and the flat portion 22C1 is spot welded, and the plunger tube / valve body 12 is spring-loaded. The cum surrounding member 22 is temporarily fixed. In this temporarily fixed state, as described above with reference to FIGS. 6 and 7, the ring-shaped brazing material 25 before melting is arranged along the arc edge 22C11 of the flat portion 22C1, and the step portion 12c is formed by the rising portion 22C2. And a semi-finished product shown in FIG.

  Next, in the semi-finished product of FIG. 8, the flange portion 15c of the bottomed cylindrical member 15 with a flange is press-fitted and fixed to the inner peripheral surface of the opening of the large diameter portion 12b. This press-fitting is performed with the hooked end in the state where the opening edge of the large-diameter portion 12b of the plunger tube / valve body 12 is applied to the outer peripheral edge of the flanged portion 15c of the flanged bottomed cylindrical member 15 that has received the flange portion 15c. By pressing the plunger tube / valve body 12 by a predetermined amount against the bottom tube member 15, the flange portion 15c of the bottomed tube member 15 with a flange is press-fitted and fixed at a predetermined position of the opening of the large diameter portion 12b. The semi-finished product shown in is obtained.

  When the semi-finished product shown in FIG. 9 is obtained, next, the first copper joint pipe 19 is inserted into the first inlet / outlet port 14 of the large-diameter portion 12b, and the insertion end is a cylinder of the spring receiver / enclosure member 22 The second copper joint pipe 20 is inserted into the cylindrical portion 15a forming the second inlet / outlet port 16, and the insertion end thereof is connected to the bottom portion 15b. The semi-finished product shown in FIG.

In the state of the semi-finished product of FIG. 10, along the outer periphery of the first copper joint pipe 19 and the second copper joint pipe 20 along the opening edges of the first inlet / outlet port 14 and the second inlet / outlet port 16, respectively. A ring-shaped brazing material (not shown ) before melting is disposed, and a ring before melting along the outer peripheral edge of the flange 15c press-fitted to the inner periphery of the opening of the large diameter portion 12b. Flux-shaped brazing is performed by placing a large number of brazing materials (not shown) in a brazing jig (not shown), carrying them in an atmosphere furnace and heating them. . The brazing jig holds a large number of the semi-finished products in FIG. 10 in an inclined manner so that the ring-shaped brazing material before melting disposed at a predetermined position is not displaced.

  Thereafter, the plunger spring 46 is inserted into the plunger tube / valve body 12 in which the first copper joint pipe 19 and the second copper joint pipe 20 are brazed, through the opening of the small diameter portion 12a. Subsequently, from the opening of the small diameter portion 12a, the filter element 27, the orifice member 28, and the filter element 29 are sequentially inserted into the hollow opening portion 21D and fixed by caulking at the tip portion, and the cylindrical filter element 26 is attached to the outer peripheral portion of the small diameter portion 21E. The fitted valve body 21 and the plunger 41 that is caulked and integrated with the valve body 21 are inserted. Next, the plug member 42 is inserted until the stepped portion 42a hits the opening edge of the small diameter portion 12a. Thereafter, the opening of the small diameter portion 12a and the outer periphery of the plug member 42 fitted in the opening are sealed and joined by welding or the like. The welding of these portions may be performed by a normal welding method such as laser welding or electron beam welding in addition to TIG welding such as argon or plasma.

  The sealing of the plug member 42 fitted in the opening of the small diameter portion 12 a is performed by seating the winding end of the fixed end on the leading edge 22 B 1 of the folded portion 22 B of the spring receiving and surrounding member 22, The plunger spring 46 whose movable end is seated on the step portion 41A is compressed so that a desired spring biasing force can be obtained. Finally, as described above, the outer rod 44 holding the electromagnetic coil portion 45 of the electromagnetic solenoid device 40 is connected to the plug member 42 by the bolt 43, whereby the assembly of the normally open electromagnetic valve is completed.

According to the normally open solenoid valve according to the above-described embodiment, the following effects can be obtained.
(1) Use the flux to braze by replacing the brass parts of the conventional normally open solenoid valve with stainless steel parts while maintaining the functions of airtightness and securing the flow path. The number of parts, the number of processes, and the weight can be reduced by using pressed parts.

(2) The valve body and the plunger tube can be integrated and formed by press working, and the manufacturing cost can be reduced.
(3) Since it is possible to braze the stainless steel members and the stainless steel valve body to the copper joint without using flux, the possibility of adverse effects on the natural environment is reduced. In addition, the cost of managing the work environment can be reduced.

(4) The brazing performed without using the flux of the normally open solenoid valve can be performed at a time, and the productivity can be improved and the working environment can be cleaned.

  FIG. 11 shows an air conditioner in which the above-described valve-opening solenoid valve 10 with a throttle is incorporated as a cycle dry valve.

  This air conditioner includes a compressor 100, an outdoor heat exchanger 101, a first indoor heat exchanger 102, a second indoor heat exchanger 103, and refrigerant passages 105 to 113 that connect these in a loop, An expansion valve 104 provided in a refrigerant passage (107 to 109) between the outdoor heat exchanger 101 and the first indoor heat exchanger 102, and a refrigerant connected in a loop for switching between a cooling mode and a heating mode And a four-way valve 115 for reversing the flow direction of the refrigerant in the passages 105 to 113.

  An electromagnetic valve (cycle dry valve) 10 is connected to the refrigerant passage 110 between the first indoor heat exchanger 102 and the second indoor heat exchanger 103.

  In the cooling mode, the refrigerant circulates in the direction indicated by the solid line arrow in FIG. 11, the cooling mode is obtained in a state where the throttle valve device 10 is opened, and the electromagnetic valve 10 is closed. In this state, the electromagnetic valve 10 acts as a throttle valve, and a cooling cycle dry mode (dehumidification during cooling) is obtained.

  In the heating mode, the refrigerant circulates in the direction opposite to the direction indicated by the arrow in FIG. 11, and the solenoid valve 10 normally maintains the valve open state.

  The electromagnetic valve 10 is provided in the indoor unit of the air conditioner. However, the provision of the spring receiver / enclosure member 22 and the like makes the annoying ringing in the cooling mode and the heating mode in which the electromagnetic valve 10 is opened. Will not occur.

  In the above-described embodiment, the normally open solenoid valve is integrally incorporated with a throttle passage that communicates the upstream side and the downstream side of the valve port when the valve is closed. The throttle passage does not necessarily have to be integrated.

It is sectional drawing which shows the valve open state of one Embodiment of the solenoid valve which concerns on this invention. It is sectional drawing which shows the valve closed state of one Embodiment of the solenoid valve which concerns on this invention. It is an expanded sectional view of the important section of the solenoid valve of one embodiment. It is a perspective view of the spring receiving and surrounding member used with the solenoid valve of one embodiment. It is a top view of the spring receiving and surrounding member used with the solenoid valve of one embodiment. It is sectional drawing which shows the relationship between the large diameter part of the plunger tube / valve main body and the spring receiver / enclosure member which were sectioned at the position of the sectional line XX in FIG. It is sectional drawing which shows the relationship between the large diameter part of the plunger tube and valve main body and the spring receiving and surrounding member which were cross-sectioned at the position of the sectional line YY in FIG. It is sectional drawing which shows the semi-finished product assembled by the assembly process. It is sectional drawing which shows the semi-finished product which press-fitted and fixed the bottomed cylindrical member with a flange to the semi-finished product of FIG. It is sectional drawing which shows the semi-finished product which assembled | attached the 1st and 2nd copper joint pipe | tube to the semi-finished product of FIG. It is a block diagram which shows the air conditioner with which the normally open type solenoid valve which concerns on one embodiment of this invention was integrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Normally-open solenoid valve 11 Plunger chamber 12 Plunger tube and valve main body 12a Small diameter part 12b Large diameter part 12c Step part 12d Circular pipe step surface 13 Valve chamber 14 1st port (1st entrance / exit port)
15 Stainless steel member (bottomed tubular member with flange)
17 Valve port 16 Second port (second inlet / outlet port)
19 1st copper joint pipe 20 2nd copper joint pipe 21 Valve body 22 Spring receiving and surrounding member 22C Flange 22C1 Flat part 22C11 Arc edge 22C2 Tongue-like rising part 25 Ring-shaped brazing material R Brazing 40 Electromagnetic solenoid Device 41 Plunger 45 Coil 46 Plunger spring 100 Compressor 101 Outdoor heat exchanger 102 First indoor heat exchanger 103 Second indoor heat exchanger 104 Expansion valve 115 Four-way valve

Claims (3)

A valve body disposed in the valve chamber is connected to a plunger of an electromagnetic solenoid device disposed in the plunger chamber, and the valve port is opened and closed by moving the valve body together with the plunger. When the coil of the electromagnetic solenoid device is not energized When the coil is energized, the valve element positioned at the valve opening position by the spring biasing force of the movable end of the plunger spring is magnetically attracted to the plunger spring against the spring biasing force of the plunger spring to close the valve. A normally open solenoid valve driven to a position,
Plunger tube comprising a stainless steel stepped circular tube having a small diameter portion defining the plunger chamber, a large diameter portion defining the valve chamber, and a stepped portion connecting the small diameter portion and the large diameter portion. With a valve body,
A stainless steel spring receiving and surrounding member that surrounds the outer periphery of the tip of the valve body in the valve open position while following the fixed end of the plunger spring so as to follow the stepped surface in the circular tube of the stepped portion Positioned and fixed by flux-free brazing in an atmospheric furnace,
The first copper joint pipe is hermetically joined by non-flux brazing in an atmospheric furnace and connected to the first port that is always in communication with the valve chamber drilled in the wall portion of the large-diameter portion,
A second port, and a valve seat formed around an opening end on the valve chamber side of the valve port provided between the second port and the valve chamber, at the opening of the large diameter portion. The stainless steel member that is hermetically joined and fixed by flux-free brazing in an atmospheric furnace,
A second copper joint pipe is hermetically joined to the second port by non-flux brazing in an atmospheric furnace;
The spring receiving and surrounding member is provided with a flat portion having an arc edge having a diameter smaller than the inner diameter of the large diameter portion and a tongue-shaped rising portion disposed between two adjacent flat portions. And when the flat portion is temporarily fixed to the stepped surface in the circular tube by welding, the tongue-shaped rising portion is attached to the arc edge of the flat portion until the flux-free brazing is performed. A normally open solenoid valve, characterized in that a ring-shaped brazing material disposed along the ring is held at a meeting portion between the step surface in the circular tube and the inner peripheral surface of the large-diameter portion . The spring receiving and surrounding member, the flange has a folded portion folded back along the inner peripheral surface of the cylindrical portion from one end of the cylindrical portion integrally formed at the other end,
The normally open solenoid valve according to claim 1 , wherein a winding end of a fixed end of the plunger spring is seated on a leading edge of the folded portion . A compressor,
An outdoor heat exchanger,
A first indoor heat exchanger;
A second indoor heat exchanger;
A refrigerant passage connecting these in a loop;
An expansion valve provided in a refrigerant passage between the outdoor heat exchanger and the first indoor heat exchanger;
The normally open solenoid valve according to claim 1 or 2 connected between the first indoor heat exchanger and the second indoor heat exchanger;
An air conditioner comprising: a throttle passage communicating the upstream side and the downstream side of the valve port when the normally open solenoid valve is closed.

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