Solenoid valve and manufacturing method thereof

Abstract

The present invention provides a solenoid valve having a fixing structure of a housing, a suction member, and a holder suitable for cost reduction, and a method for manufacturing the same. A solenoid valve (1) is provided with: a main valve body (40) that opens and closes a main valve port (15) located in a valve body (10); a connector (20) for integrally fixing a housing (32) having the plunger (33) disposed on the inner side and the electromagnetic coil (34) mounted on the outer side, a holder (21) connected to the valve body, and a suction member (25) for sucking the plunger; and a pilot valve body (36) which is connected to the plunger via a valve shaft (35) and which opens and closes a pilot valve port (45) located in the main valve body, and in the connection body, the connection portion between the holder and the suction member and the connection portion between the suction member and the housing are both brazed.

Description

Technical Field

[0001] The present invention relates to a solenoid valve and a method for manufacturing the same. Background Art

[0002] Solenoid valves include normally closed types (normally closed at all times) that open only when energized and normally open types (normally open at all times) that close only when energized. In addition, solenoid valves include direct-acting types and pilot-operated types. The direct-acting type directly opens and closes the valve core through an electromagnetic coil, and the pilot-operated type drives a pilot valve to open and close through an electromagnetic coil and opens and closes the main valve following the opening and closing of the pilot valve. These solenoid valves are used separately according to the application. As technologies for disclosing solenoid valves, there are the following patent documents.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-7572

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2023-2057

[0007] In the solenoid valve described in Patent Document 1, a threaded portion is integrally formed on the attracting member in order to thread-connect the attracting member to the valve body. Since the attracting member is obtained by machining a workpiece made of a soft magnetic metal, there is a possibility that the cutting amount of the workpiece is large and the material cost and processing cost increase. In addition, since the attracting member is exposed to the environment outside the housing, the need for corrosion resistance of the attracting member also makes it difficult to reduce costs.

[0008] The solenoid valve described in Patent Document 2 processes a cage having a threaded portion thread-connectable to the valve body and an attracting member as different components, and integrates the cage and the attracting member after processing, thereby reducing the cutting amount of the workpiece. In addition, by welding the housing to the cage and disposing the attracting member inside the housing, it is possible to manufacture the attracting member using a material with low corrosion resistance.

[0009] However, since the housing is welded to the cage, the shape of the cage is complicated so that the torch (coupling portion) of the welding machine does not buffer during welding. Therefore, further research is desired for reducing the processing man-hours and material costs when cutting threaded components. Summary of the Invention

[0010] An object of the present invention is to provide a solenoid valve and a method for manufacturing the same that can solve the above-described technical problems, and that can improve the workability during the manufacture of the solenoid valve and contribute to cost reduction of the solenoid valve by using a fixing structure of a housing, an attracting member, and a cage.

[0011] To achieve the above object, the solenoid valve of the present invention includes: a valve body having a valve port; a connecting body that integrally fixes a housing, a cage, and an attracting member, the housing having a plunger disposed inside and an electromagnetic coil mounted outside, the cage being connected to the valve body, the attracting member attracting the plunger; and a valve core that is connected to the plunger via a valve shaft and opens and closes the valve port, wherein the connecting body has solder at the connecting portion between the cage and the attracting member and at the connecting portion between the attracting member and the housing.

[0012] Alternatively, to achieve the above object, the solenoid valve of the present invention includes: a valve body; a main valve core that opens and closes a main valve port located in the valve body; a connecting body that integrally fixes a housing, a cage, and an attracting member, the housing having a plunger disposed inside and an electromagnetic coil mounted outside, the cage being connected to the valve body, the attracting member attracting the plunger; and a pilot valve core that is connected to the plunger via a valve shaft and opens and closes a pilot valve port located in the main valve core, wherein the connecting body has solder at the connecting portion between the cage and the attracting member and at the connecting portion between the attracting member and the housing.

[0013] To achieve the above object, the manufacturing method of the solenoid valve of the present invention is the manufacturing method of the following solenoid valve, which includes: a valve body having a valve port; a connecting body that integrally fixes a housing, a cage, and an attracting member, the housing having a plunger disposed inside and an electromagnetic coil mounted outside, the cage being connected to the valve body, the attracting member attracting the plunger; and a valve core that is connected to the plunger via a valve shaft and opens and closes the valve port, and the manufacturing method has the following soldering process: manufacturing the connecting body by simultaneously soldering the cage and the attracting member and soldering the attracting member and the housing.

[0014] Alternatively, to achieve the above object, the manufacturing method of the solenoid valve of the present invention is the manufacturing method of the following solenoid valve, which includes: a valve body; a main valve core that opens and closes a main valve port located in the valve body; a connecting body that integrally fixes a housing, a cage, and an attracting member, the housing having a plunger disposed inside and an electromagnetic coil mounted outside, the cage being connected to the valve body, the attracting member attracting the plunger; and a pilot valve core that is connected to the plunger via a valve shaft and opens and closes a pilot valve port located in the main valve core, and the manufacturing method has the following soldering process: manufacturing the connecting body by simultaneously soldering the cage and the attracting member and soldering the attracting member and the housing.

[0015] Effects of the Invention

[0016] If the fixing structure of the housing, the attracting member, and the cage portion according to the present invention is used, a solenoid valve that can reduce the processing man-hours and material costs during the manufacture of the solenoid valve and can improve the workability can be provided.

[0017] Other objects, features, and advantages of the present invention will be clarified by the following description of embodiments of the present invention based on the drawings. In addition, in each figure, the same reference numerals denote the same or corresponding parts. Description of the Drawings

[0018] Figure 1 It is a cross-sectional view of a solenoid valve according to an embodiment of the present invention.

[0019] Figure 2 is Figure 1 a cross-sectional view of the connecting body of the solenoid valve.

[0020] Symbol Explanation

[0021] 1... Solenoid valve, 10... Valve body, 11... Inlet port, 12... Outlet port, 14... Main valve chamber, 15... Main valve port, 16... Main valve seat, 17... Mounting portion, 20... Connecting body, 21... Cage, 24... Bonding hole, 24a... Flange portion, 25... Attracting member, 25a... Lower end portion, 25b... Upper end portion, 25c... Recess, 26... Housing support surface, 32... Housing, 33... Plunger, 34... Electromagnetic coil, 35... Valve shaft, 35a... Fluid passage, 36... Pilot valve core, 37... Pilot valve chamber, 38... Plunger spring, 39... Valve opening spring, 40... Main valve core, 42... Piston ring, 42a... Pressure equalizing passage, 43... Gasket, 44... Wave washer, 45... Pilot valve port, 46... Pilot valve seat, 48... Bolt-like member, 49... Ring member, 51... Bolt, 53a, 53b... Brazing filler metal. Detailed Description of the Embodiment

[0022] Hereinafter, with reference to Figure 1 , Figure 2 a pilot-operated solenoid valve according to an embodiment of the present invention will be described.

[0023] Figure 1 It is a cross-sectional view of the solenoid valve in the valve-open state according to an embodiment of the present invention. Figure 2 It is an explanatory view of the connecting body, and is a cross-sectional view corresponding to Figure 1 . In the following description, the terms "up and down, left and right" indicate the relative positional relationship of the components described in each figure.

[0024] As Figure 1As shown, the solenoid valve 1 according to this embodiment includes a valve body 10, a connecting body 20, a plunger 33, an electromagnetic coil 34, a valve shaft 35, a pilot valve core 36, and a main valve core 40. Here, the connecting body 20 is a sub-assembly that integrally fixes the attracting member 25, the cage 21 formed with a threaded portion, and the housing 32. The electromagnetic coil 34 has a coil 34a and a housing 34b, and is installed on the outer peripheral portion of the housing 32.

[0025] The valve body 10 has a substantially cylindrical shape. The valve body 10 has an inlet 11, an outlet 12, a main valve chamber 14, a main valve port 15, and a main valve seat 16. The valve body 10 is made of, for example, aluminum alloy. In addition, a thread 10a is formed on the outer peripheral portion of the valve body 10. The solenoid valve 1 of this embodiment is used by being installed on a frame body (flow path block) not shown through the thread 10a. When the valve body 10 is inserted into the valve mounting hole of the frame body, the outlet 12 on the bottom surface of the valve body 10 communicates with the outflow passage opening to the bottom surface of the valve mounting hole of the frame body, whereby the refrigerant in the main valve chamber 14 can flow out through this outflow passage.

[0026] On the other hand, the valve body 10 has a plurality of (four in total, one each in the front, rear, left, and right in this embodiment) openings on its circumferential surface that can be used as a flow path for the refrigerant to flow into the main valve chamber 14, and these openings serve as the above-mentioned inlets 11. When the valve body 10 is inserted into the valve mounting hole of the frame body, the four openings (inlets 11) of the valve body 10 communicate with the inflow passage on the frame body side. Thus, the refrigerant can flow into the main valve chamber 14 through these openings.

[0027] In addition, sealing members (O-rings) 33 and 34 respectively installed in two groove portions formed on the outer peripheral surface of the valve body 13 are used to seal between the outside and the inflow passage side and the outflow passage side.

[0028] The cage 21 is coupled to the mounting portion 17 of the valve body 10. An external thread is formed on the outer peripheral surface of the cage 21, and an internal thread is formed on the inner peripheral surface of the mounting portion 17. The cage 21 is screwed (threadedly connected) to the mounting portion 17 of the valve body 10. A coupling hole 24 is formed on the inner peripheral surface of the cage 21. In addition, the material of the cage 21 is preferably a material with relatively good corrosion resistance and machinability such as stainless steel. In addition, an O-ring 22 is disposed at the bottom of the mounting portion 17 to prevent refrigerant leakage.

[0029] The attracting member 25 has a cylindrical shape. The lower end portion 25a of the attracting member 25 protrudes outward in a flange shape, and the outer diameter of the lower end portion 25a is larger than the outer diameter of the upper end portion 25b. The lower end portion 25a is disposed and fixed inside the coupling hole 24 of the cage 21. Specifically, the lower end portion 25a is brazed to the coupling hole 24. The outer diameter of the upper end portion 25b is the same as or slightly smaller (substantially the same) than the inner diameter of the housing 32.

[0030] The attracting member 25 of this embodiment is made of free-cutting steel with soft magnetism. As the material of the attracting member 25, it can also be made of magnetic stainless steel, but a material with high magnetic permeability and low coercive force is preferred.

[0031] The housing 32 is made of non-magnetic stainless steel. The housing 32 has a cylindrical shape, is open at the lower part, and is blocked at the upper part by a bolt-like member 48. The inner diameter of the housing 32 is the same (substantially the same) as the outer diameter of the upper end portion 25b of the attracting member 25. The bolt-like member 48 is hermetically fixed to the housing 32 by welding. The housing 32 is inserted into the outer peripheral portion of the upper end portion 25b of the attracting member 25 and is brazed to the attracting member 25 in a state of being placed on the upper surface (housing support surface 26) of the lower end portion 25a. In addition, the fixing of the cage 21 to the attracting member 25 and the fixing of the attracting member 25 to the housing 32 are both performed by brazing. The fixing structure of the connecting body 20 will be described later.

[0032] The bolt-like member 48 is made of a magnetic material and is composed of a cylindrical head 48a with a large outer diameter that closes the upper surface opening of the housing 32 and a cylindrical foot 48b with a small outer diameter that extends vertically downward from the lower surface of the head 48a. In the central portion of the head 48a, an internal thread 50 is formed from the upper surface of the head 48a. The internal thread 50 is screwed with a bolt 51 of the outer shell 34b of the fixed electromagnetic coil 34 (described later). In addition, the bolt-like member 48 also functions as a stopper for stopping the plunger 33 that moves upward when the valve is opened. Further, in this embodiment, in order to prevent the bolt-like member 48 from contacting and not separating from the plunger 33, a ring member 49 made of resin or metal is interposed between the bolt-like member 48 and the plunger 33.

[0033] The plunger 33 has a cylindrical shape. The outer diameter of the plunger 33 is slightly smaller than the inner diameter of the housing 32. The plunger 33 is arranged inside the housing 32 so as to be movable in the vertical direction. A plunger spring 38 is arranged between the plunger 33 and the attracting member 25. The plunger spring 38 is a compression coil spring. The plunger spring 38 pushes the plunger 33 upward.

[0034] The electromagnetic coil 34 is formed by surrounding a bobbin wound with a coil 34a with an outer shell 34b made of a magnetic material. The electromagnetic coil 34 is arranged outside the housing 32, and the upper plate portion of the outer shell 34b is fixed to the bolt-like member 48 via a bolt 51. The electromagnetic coil 34 magnetizes the attracting member 25, the plunger 33, the bolt-like member 48, and the outer shell 34b. In addition, a corrugated washer 44 as an elastic member is compression-mounted in the gap between the bottom of the electromagnetic coil 34 and the valve body side (precisely, the gap between the lower plate portion of the outer shell 34b and the housing support surface 26 of the attracting member 25).

[0035] In addition, when the bolt 51 is tightened to fix the top plate portion of the housing 34b to the bolt-like member 48, the corrugated washer 44 is compressed and elastically deformed, thereby coming into a state of being in press contact (contact in a pressed state) with both the lower plate portion of the housing 34b and the housing support surface 26 of the lower end portion 25a of the attracting member 25. Thus, even if there are deviations (tolerances) in the dimensions of the housing 34b or the fixing position of the electromagnetic coil 34 in the vertical direction based on the bolt 51, these deviations (tolerances) can be absorbed to prevent the occurrence of gaps, and the lower plate portion of the housing 34b, the corrugated washer 44, and the lower end portion 25a can be made to closely adhere to each other to form a good magnetic circuit. Additionally, a spring washer can be used instead of the corrugated washer 44.

[0036] The valve shaft 35 is in a shaft shape or a rod shape. The upper end portion of the valve shaft 35 is fixed to the lower end portion of the plunger 33. The valve shaft 35 is disposed so as to penetrate the attracting member 25. The valve shaft 35 is supported by the attracting member 25 so as to be movable in the vertical direction. The valve shaft 35 has a fluid passage 35a, and the inner space of the plunger 33 is connected to the outer space through the fluid passage 35a. The pilot valve element 36 is fixed to the lower end portion of the valve shaft 35. The pilot valve element 36 is a gasket made of synthetic resin in a disc shape.

[0037] The main valve element 40 is disposed inside the main valve chamber 14 so as to be movable in the vertical direction, and divides the main valve chamber 14 and the pilot valve chamber 37. The main valve element 40 has a pilot valve port 45 penetrating in the vertical direction. The pilot valve port 45 connects the main valve port 15 and the pilot valve chamber 37. The upper end of the pilot valve port 45 is open on the upper surface of the main valve element 40, and a pilot valve seat 46 surrounding the pilot valve port 45 is formed.

[0038] The main valve element 40 has a pressure equalizing passage 42a connecting the main valve chamber 14 and the pilot valve chamber 37. A groove is formed on the outer peripheral surface on the upper side of the main valve element 40, and a piston ring 42 is housed therein. A disc-shaped gasket 43 is mounted on the lower surface of the main valve element 40. The gasket 43 is made of synthetic resin, for example. An opening valve spring 39 is disposed between the main valve element 40 and the valve body 10. The opening valve spring 39 is a compression coil spring that pushes the main valve element 40 upward.

[0039] In the electromagnetic valve 1, the inner spaces of the main valve chamber 14, the pilot valve chamber 37, and the housing 32 are spaces for introducing refrigerant, and are sealed from the environment outside the housing 32.

[0040] Next, an example of the operation of the electromagnetic valve 1 will be described.

[0041] In Figure 1In the solenoid valve 1 shown, the electromagnetic coil 34 is in a non-energized state. In this state, the pilot valve core 36 separates from the pilot valve seat 46, and the pilot valve port 45 opens. The refrigerant pressure in the main valve chamber 14 is greater than the refrigerant pressure in the pilot valve chamber 37. Due to the pressure difference, the main valve core 40 is pushed upward and separates from the main valve seat 16, and the main valve port 15 opens. The solenoid valve 1 is in an open valve state.

[0042] In addition, when the compressor (not shown) of the refrigeration cycle stops, the pressure difference between the refrigerant pressure in the main valve chamber 14 and the refrigerant pressure in the pilot valve chamber 37 disappears or becomes smaller. Therefore, the main valve core 40 is pushed upward by the valve opening spring 39 and separates from the main valve seat 16, becoming an open valve state.

[0043] When the electromagnetic coil 34 becomes energized, the attracting member 25 and the plunger 33 are magnetized, and the plunger 33 approaches the attracting member 25 against the elastic force of the plunger spring 38. The pilot valve core 36 moves together with the plunger 33. When the pilot valve port 45 is closed, the refrigerant flows into the pilot valve chamber 37 from the pressure equalizing passage 42a (accurately, the gap between the inner peripheral surface of the main valve chamber 14 and the outer peripheral surface of the main valve core 40 and the pressure equalizing passage 42a). The refrigerant pressure in the pilot valve chamber 37 is greater than the refrigerant pressure in the main valve chamber 14. Due to this pressure difference, the main valve core 40 is pushed toward the main valve port 15 side. Then, the main valve core 40 closes the main valve port 15, and the solenoid valve 1 becomes a closed valve state.

[0044] When the electromagnetic coil 34 becomes non-energized again, the magnetization of the attracting member 25 and the plunger 33 is eliminated, and the plunger 33 is pushed by the plunger spring 38 and separates from the attracting member 25. The pilot valve core 36 moves together with the plunger 33, and the pilot valve port 45 opens. The refrigerant flows from the pilot valve chamber 37 to the main valve port 15 through the pilot valve port 45. The refrigerant pressure in the main valve chamber 14 is greater than the refrigerant pressure in the pilot valve chamber 37. Therefore, the main valve core 40 moves upward (in the valve opening direction), and the solenoid valve 1 becomes an open valve state.

[0045] The connecting body 20, which is a characteristic structure of the present invention, will be described.

[0046] Figure 2 is an explanatory view of the connecting body 20. The connecting body 20 connects two connecting parts by brazing. In the brazing process, it is introduced into the brazing furnace in the Figure 2 assembled state. Figure 2It is in a state where the cage 21, the attracting member 25, and the housing 32 are placed in this order. At this time, the solder 53a is disposed in the gap between the cage 21 and the attracting member 25. The solder 53b is disposed between the attracting member 25 and the housing 32. In addition, the housing 32 is placed in such a manner as to insert the outer peripheral portion of the attracting member 25. By performing soldering in this way, the cage 21, the attracting member 25, and the housing 32 can be fixed integrally in one soldering process. That is, the soldering of the cage and the attracting member and the soldering of the attracting member and the housing are performed simultaneously in the soldering process for manufacturing the connecting body 20.

[0047] In addition, the solders 53a and 53b are solders formed in a ring shape (so-called ring solder). The cage 21 supports the lower end portion 25a of the attracting member 25 through the inner flange portion 24a of the coupling hole 24, and the attracting member 25 supports the housing 32 through the lower end portion 25a.

[0048] In the soldering process of the present embodiment, the solder 53a disposed in the gap between the cage 21 and the attracting member 25 and the solder 53b disposed between the attracting member 25 and the housing 32 are in relatively close positions. The materials of the solders 53a and 53b are the same and both are in contact with the attracting member 25. Therefore, even if there is some deviation in the temperature distribution of the soldering furnace, the solders 53a and 53b are at the same temperature, so it is difficult to cause soldering defects in the soldering process.

[0049] A tapered portion 21b is formed on the upper end side of the coupling hole 24 of the cage 21 to widen the gap. The solder 53a is disposed in the recess formed between the tapered portion 21b and the attracting member 25. Due to the tapered portion 21b, the disposition of the solder 53a becomes easy, and the molten solder (53a) is difficult to flow out, so it is easy to penetrate between the cage 21 and the attracting member 25. In the connecting body after soldering, it becomes a state where the solidified solder exists in the connecting portion between the cage 21 and the attracting member 25 and the connecting portion between the attracting member 25 and the housing 32, and sufficient connection strength is ensured for the connecting portion.

[0050] The attracting member 25 has a concave portion 25c on the outer peripheral surface at a height continuous with the housing support surface 26 which is the upper surface of the lower end portion 25a, and the disposition of the solder 53b and the molten solder 53b in the soldering furnace easily penetrate between the attracting member 25 and the housing 32. The molten solder 53b invades the gap between the outer peripheral portion of the attracting member 25 and the housing 32 and solidifies, so sufficient connection strength can be ensured for the connecting portion.

[0051] The solder 53b is substantially disposed on the housing support surface 26 of the lower end portion 25a, so there is no need to worry about the positional deviation of the solder 53b before melting. Even if a part of the melted solder 53b overflows to the outside of the housing 32, it only spreads on the housing support surface 26 of the lower end portion 25a. Therefore, the solder does not adhere to the outer peripheral portion of the housing 32 and does not hinder the installation of the electromagnetic coil 34. In addition, the concave portion 25c is not an essential structure, and the solder 53b can also be configured to be sandwiched between the lower end portion 25a and the lower end of the housing 32.

[0052] According to the present invention, the cutting amount and processing man-hours of the cage 21 and the attracting member 25 can be reduced, and a connecting body 20 in which the housing, the attracting member, and the cage are fixed together can be manufactured in a single soldering process. Therefore, it is possible to contribute to the improvement of workability during the manufacture of the solenoid valve and the cost reduction of the solenoid valve. In addition, since there is no welded portion in the portion where the electromagnetic coil 34 is disposed, the installation of the electromagnetic coil 34 becomes smooth.

[0053] As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment. As long as it does not violate the gist of the present invention, embodiments in which those skilled in the art appropriately add, delete, or design-change the constituent elements of the above-described embodiment are also included in the scope of the present invention. For example, instead of the bolt 51 of the above-described embodiment, a locking structure using a clip or a pin may be employed.

[0054] In the description of the above embodiment, the case where the pilot spool 36 is provided separately from the valve shaft 35 and the gasket 43 is provided on the lower surface of the main spool 40 has been described, but the present invention is not limited thereto. As long as the pilot valve seat 46 and / or the main valve seat 16 can be well closed, a structure in which the pilot spool 36 and / or the gasket 43 is replaced with another structure may also be employed.

[0055] In addition, although the solenoid valve according to the above-described embodiment is a normally open pilot-type solenoid valve, the present invention is not limited to such a pilot-type solenoid valve. The connecting body 20, which is a characteristic structure of the present invention, can also be applied to a direct-acting solenoid valve. For example, a direct-acting solenoid valve has the following structure: it does not have a main spool as in the above-described embodiment, and the main valve seat is opened and closed by a valve portion mounted on a plunger. The connecting portion and the connecting body 20 mounted on the housing can also be adopted in such a direct-acting solenoid valve.

[0056] In addition, the solenoid valve according to the present invention can typically be preferably used for refrigeration cycle devices having a refrigerant circuit such as an air conditioner (air conditioner), a freezer / refrigerator, etc., but is not limited to these. In addition, the solenoid valve according to the present invention can be used in various applications.

Claims

1. A solenoid valve having: a valve body having a valve port; A connecting body that fixes a housing, a retaining frame, and an attracting member into one body, wherein a plunger is arranged inside the housing and an electromagnetic coil is installed outside the housing, the retaining frame is connected to the valve body, and the attracting member attracts the plunger; and A valve core is connected to the plunger via a valve shaft to open and close the valve port. It is characterized in that The connecting body has solder at a connecting portion between the holder and the suction member and a connecting portion between the suction member and the housing.

2. A solenoid valve, comprising: a valve body; a main valve core, which opens and closes a main valve port located in the valve body; a connecting body, which fixes a housing, a retaining frame and an attracting member as a whole, wherein a plunger is arranged on the inner side of the housing and an electromagnetic coil is installed on the outer side, the retaining frame is connected to the valve body, and the attracting member attracts the plunger; and a pilot valve core, which is connected to the plunger via a valve shaft and opens and closes a pilot valve port located in the main valve core, It is characterized in that The connecting body has solder at a connecting portion between the holder and the suction member and a connecting portion between the suction member and the housing.

3. The solenoid valve according to claim 1 or 2, characterized in that: The upper end portion of the suction member is disposed inside the housing.

4. The solenoid valve according to claim 1 or 2, characterized in that: The retaining frame has a coupling hole for fixing the lower end side of the suction member, The suction member has a housing support surface on which the housing is placed.

5. The solenoid valve according to claim 4, characterized in that: The coupling hole has a tapered portion at an upper end side.

6. The solenoid valve according to claim 4 or 5, characterized in that: An elastic component is provided, which is installed to compress the gap between the bottom of the electromagnetic coil and the housing support surface of the attracting member and is made of magnetic material.

7. The solenoid valve according to claim 6, characterized in that: The elastic component is a wave washer or a spring washer.

8. A method for manufacturing a solenoid valve, the solenoid valve comprising: a valve body having a valve port; A connecting body that fixes a housing, a retaining frame, and an attracting member into one body, wherein a plunger is arranged inside the housing and an electromagnetic coil is installed outside the housing, the retaining frame is connected to the valve body, and the attracting member attracts the plunger; and A valve core is connected to the plunger via a valve shaft to open and close the valve port. It is characterized in that The manufacturing method includes a brazing step of manufacturing the connection body by simultaneously brazing the retainer and the attracting member and brazing the attracting member and the housing.

9. A method for manufacturing a solenoid valve, the solenoid valve comprising: a valve body; a main valve core, the main valve core opens and closes a main valve port located in the valve body; a connecting body, the connecting body fixing a housing, a retaining frame and an attracting member as a whole, the housing having a plunger disposed on the inner side and an electromagnetic coil mounted on the outer side, the retaining frame being connected to the valve body, the attracting member attracting the plunger; and a pilot valve core, the pilot valve core being connected to the plunger via a valve shaft, and opening and closing a pilot valve port located in the main valve core, It is characterized in that The manufacturing method includes a brazing step of manufacturing the connection body by simultaneously brazing the retainer and the attracting member and brazing the attracting member and the housing.

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