Solenoid valve

Abstract

The utility model relates to an electromagnetic valve which does not generate unfavorable conditions due to dew condensation. A solenoid valve (100) is provided with: a valve body (30) having a mounting surface (30a) provided with an upper large-diameter hole (30b) (connection hole); a connecting part (22) which is fastened to the upper large-diameter hole part and is welded and fixed to one end part of the housing (51); a coil unit (70) which is fixed to the other end side of the housing and which is provided with a housing (73); a plunger (50) housed inside the housing; and a main valve body (40) in which an upper plate (73a), a lower plate (73b), and a side plate (73c) connecting the upper plate and the lower plate are connected together in accordance with the movement of the plunger, the connection portion is disposed so as to protrude from the mounting surface and has a base portion (22a) facing the lower plate with a gap therebetween, the lower plate is provided with a protruding portion (74) protruding toward the mounting surface, the mounting surface has a recessed portion (37), and the recessed portion fits into the protruding portion to restrict the rotation of the housing. The upper large-diameter hole portion is continuous with the lower large-diameter hole portion.

Description

Technical Field

[0001] The utility model relates to a solenoid valve that can be used in a refrigeration cycle device. Background Art

[0002] Solenoid valves that use electromagnetic actuators to open and close valves have been used in refrigeration cycle systems with refrigerant circuits such as air conditioners, refrigeration devices, and freezing devices.

[0003] Since leads are connected to the coil unit of the solenoid valve, it is necessary to fix the coil unit in such a way that the assembly position is constant with respect to the valve body. For example, in the solenoid valve of Patent Document 1, a convex portion provided at the bottom of the housing of the coil unit is engaged with a concave portion of the valve body and fixed at a constant position.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 2013-213524.

[0007] However, depending on the usage conditions of the solenoid valve, moisture (liquid moisture) from condensation or the external environment may sometimes penetrate into the gap between the valve body and the coil unit. In the solenoid valve of Patent Document 1, if the moisture that has penetrated into the gap freezes, there is a concern about the following problems: positional deviation of the coil unit and deformation of the housing that houses the plunger due to the expansion during freezing. Summary of the Utility Model

[0008] An object of the utility model is to provide a solenoid valve that is less likely to cause problems even in an environment exposed to moisture from condensation or the external environment.

[0009] To solve the above problems and achieve the object, the solenoid valve according to the utility model includes: a valve body having an installation surface with a connection hole portion; a cylindrical housing; a connection portion to which one end side of the housing is fixed and which is fastened to a fastening portion formed in the connection hole portion; a coil unit fixed to the other end side of the housing and having a housing mounted on the coil; a plunger housed inside the housing and driven by the coil; and a valve element that moves with the plunger. The housing is formed by connecting an upper plate, a lower plate, and side plates connecting the upper plate and the lower plate. The connection portion has a base portion that faces the lower plate with a gap. The lower plate has a convex portion protruding toward the installation surface, and the installation surface has a concave portion that fits the convex portion to restrict the rotation of the housing. The concave portion is continuous at least from the position where the convex portion is inserted to the connection hole portion.

[0010] According to the present utility model, it is possible to provide a solenoid valve in which even when exposed to moisture from condensation or the external environment, it is difficult to cause defects such as positional deviation of the coil unit.

[0011] Other objects, features, and advantages of the present utility model will be clarified by the following description of the embodiments of the present utility model based on the drawings. In addition, in each figure, the same reference numerals denote the same or corresponding parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the solenoid valve according to the embodiment of the present utility model, showing the closed valve state.

[0013] Figure 2 It is a cross-sectional view of the solenoid valve according to the embodiment of the present utility model, showing the open valve state.

[0014] Figure 3 It is a cross-sectional view of the solenoid valve according to the embodiment of the present utility model (a cross-section viewed from a direction in which it is rotated 90 degrees about the axis from the Figure 2 state).

[0015] Figure 4 It is an external view of the solenoid valve when observing the state after removing the coil unit of the solenoid valve according to the embodiment of the present utility model from above (the upper side of the axis L).

[0016] Figure 5 It is Figure 3 an enlarged view of part A.

[0017] REFERENCE SIGNS

[0018] 100 Pilot-operated solenoid valve (solenoid valve)

[0019] 10 Main valve portion

[0020] 20 Pilot valve portion

[0021] 22 Connecting portion

[0022] 22a Base portion

[0023] 22b Threaded cylindrical portion

[0024] 22c Locking hole

[0025] 30 Valve body

[0026] 30a Mounting surface

[0027] 30b Upper large-diameter hole portion (connecting hole portion)

[0028] 31 Inlet port

[0029] 32 Outlet port

[0030] 33 Main valve chamber

[0031] 34 Pilot valve chamber

[0032] 35 Main valve seat

[0033] 37 Recess

[0034] 37a Bottom of the recess

[0035] 40 Main spool valve

[0036] 41 Main valve gasket

[0037] 42 Pilot valve seat

[0038] 43 Piston ring

[0039] 44 Pressure equalizing hole

[0040] 45 Main spool valve shaft hole (pilot passage)

[0041] 46 Main spool valve spring

[0042] 50 Plunger

[0043] 51 Housing

[0044] 52 Spring

[0045] 60 Pilot valve gasket (pilot spool valve)

[0046] 70 Coil unit

[0047] 71 Coil

[0048] 72 Bobbin

[0049] 73 Outer shell

[0050] 73a Upper plate

[0051] 73b Lower plate

[0052] 73c Side plate

[0053] 74 Protrusion

[0054] 75 Bolt

[0055] 80 Attracting member

[0056] 82 Main spool valve receiving portion (space portion)

[0057] 83 O-ring Detailed implementation mode

[0058] Hereinafter, with reference to Figures 1 to 5 The solenoid valve according to the embodiment of the present utility model will be described. These figures are diagrams for explaining the structure of the solenoid valve according to the embodiment of the present utility modelFigure 1 is a sectional view showing a fully closed state, Figure 2 and Figure 3 is a sectional view showing a fully open state. Figure 4 is a top view of the appearance showing the state after removing the coil unit, and is a view capable of seeing the mounting surface of the valve body. Figure 5 is Figure 3 a partial sectional view obtained by magnifying part A of Figure 5 . In addition, only Figures 1 to 5 is hatched. Furthermore, in the description of the following embodiments, the directions of up and down, left and right, inside and outside represent Figures 1 to 5 the directions within the plane of the paper of , and no interpretation that narrows the technical scope of the present utility model is made.

[0059] First, the basic structure of the solenoid valve will be described.

[0060] As Figures 1 to 3 shown, a pilot-operated solenoid valve 100 (abbreviated as solenoid valve) according to an embodiment of the present utility model is a solenoid valve having a main valve portion 10 and a pilot valve portion 20 in a valve body 30 and can be used for a refrigeration cycle of an air conditioner or the like. By opening and closing the main valve portion 10, the flow of fluid between the fluid inlet 31 and the fluid outlet 32 is controlled to be opened and closed. The fluid inlet 31 and the fluid outlet 32 are formed in the valve body 30, and a main valve chamber 33 is provided between the fluid inlet 31 and the fluid outlet 32. As will be described later, a main valve core 40 is accommodated in the main valve chamber 33 so as to be able to slide up and down. A main valve portion 10 is formed on one side (the lower side in the illustrated embodiment) in the sliding direction of the main valve core 40, and a pilot valve portion 20 is formed on the other side (the upper side in the illustrated embodiment). In this solenoid valve 100, the valve body 30 and the main valve core 40 are made of aluminum or an aluminum alloy.

[0061] At the upper center of the solenoid valve 100, a plunger 50 for moving a pilot valve core 60 as a valve core is slidably accommodated in a cylindrical housing 51. The housing 51 is open downward and is fixed (secured) to the connecting portion 22 in a state where the outer peripheral surface is sealed by means such as riveting or welding. In addition, at the upper open end (the other end side) of the housing 51, an attracting member 80 is fixed (secured) in a state of sealing the upper end of the housing 51. A spring 52 is disposed between the plunger 50 and the attracting member 80.

[0062] The connecting portion 22 as a whole has a cylindrical shape with through holes formed vertically. As described above, the connecting portion 22 is composed of a base portion 22a and a threaded cylindrical portion 22b. The base portion 22a has an upper inner peripheral surface that fixes the lower open end (one end side) of the housing 51 in a sealed state. The threaded cylindrical portion 22b is connected to the lower side of the base portion 22a, and an external thread is formed on the outer peripheral surface. In addition, the base portion 22a of the connecting portion 22 has a flat surface on the surface (upper surface) where the housing 51 is fixed in a protruding manner. The connecting portion 22 is fastened to the fastening portion via the external thread of the threaded cylindrical portion 22b. The fastening portion is formed in the upper large-diameter hole portion 30b that is a connecting hole portion formed in the valve body 30. The upper large-diameter hole portion 30b is formed in the mounting surface 30a that is the upper surface of the valve body 30. In a state where the connecting portion 22 is fastened to the upper large-diameter hole portion 30b, when observed from the side (orthogonal direction of the axis L), the upper surface of the base portion 22a is configured not to protrude from the mounting surface 30a. In addition, the upper large-diameter hole portion 30b includes a fastening portion (internal thread) that fastens to the external thread of the connecting portion 22 and a cylindrical portion formed on the upper side of the fastening portion (constituted by two cylindrical portions in this embodiment). In addition, the connecting portion 22 is made of a stainless steel material.

[0063] A cylindrical main spool housing portion (space portion) 82 is formed inside the threaded cylindrical portion 22b of the connecting portion 22. The main spool 40 is housed in the main spool housing portion 82 in a slidable manner in the vertical direction. The space is vertically divided by the main spool 40, so that the lower part of the space becomes the main valve chamber 33, and the upper part is set as the pilot valve chamber 34. The outside of the connecting portion 22 and the valve body 30 are appropriately sealed by an O-ring 83. A piston ring 43 is arranged on the outer peripheral surface of the main spool 40 that slides inside the connecting portion 22 (the portion that slides with the inner peripheral surface of the threaded portion of the connecting portion 22), and is configured to suppress the leakage of the refrigerant.

[0064] The main valve portion 10 is composed of a main valve gasket 41 installed on the lower side of the main spool 40 and a main valve seat 35 formed between the fluid inlet 31 and the fluid outlet 32 of the valve body 30. The pilot valve portion 20 is composed of a pilot valve gasket 60 (pilot spool) installed on the bottom surface of the plunger 50 and a pilot valve seat 42 formed on the upper side of the main spool 40. A main spool shaft hole (pilot passage) 45 and a pressure equalizing hole 44 are formed in the main spool 40. The pressure equalizing hole 44 connects the main valve chamber 33 and the pilot valve chamber 34. The cross-sectional area of the narrowest part of the pressure equalizing hole 44 is smaller than the cross-sectional area of the narrowest part of the pilot passage 45. As will be described later, by forming the pressure equalizing hole 44, the main valve chamber 33 and the pilot valve chamber 34 are equalized in pressure, making the opening and closing operation of the main spool 40 easier and smoother.

[0065] The coil unit 70 is constituted by surrounding a bobbin 72 wound with a coil 71 with a housing 73 made of a magnetic material. The bobbin 72 is covered with resin to prevent moisture from infiltrating into the coil 71.Figure 3 It can be seen that the outer shell 73 is a so-called yoke, which is formed by processing a soft magnetic material into a U-shaped cross-section. Specifically, the outer shell 73 is constituted by connecting and arranging an upper plate 73a in the form of a plate disposed on the upper surface, a lower plate 73b disposed on the lower surface, and side plates 73c connecting the upper plate 73a and the lower plate 73b. The upper plate 73a of the outer shell 73 is fixed to the attracting member 80 at the upper end of the housing 51 by bolts 75.

[0066] As Figure 3 shown, a circular convex portion 74 protruding downward is formed on the lower plate 73b of the outer shell 73. On the other hand, a concave portion 37 serving as a linear groove is formed on the mounting surface 30a of the valve body 30. In a state where the tip of the convex portion 74 is inserted and locked in the concave portion 37, the coil unit 70 is fixed by bolts 75. Thus, in the concave portion 37, the locking portion of the convex portion 74 becomes a rotation-stopping portion that restricts the rotation of the coil unit 70 about the axis L. The specific structure of this rotation-stopping mechanism will be described later. In addition, in a state where the connecting portion 22 is mounted on the upper large-diameter hole portion 30b and the coil unit 70 is fixed to the other end portion of the housing 51 via bolts 75 and the attracting member 80, the lower plate 73b faces the upper surface (mounting surface 30a) of the valve body 30 with a gap (G2) therebetween (refer to Figure 5 ). Here, the state where the tip of the convex portion 74 is inserted into the concave portion 37 means a state where the concave portion 37 and the convex portion 74 have an overlapping region in the height direction (axis L direction).

[0067] Next, the operation of the solenoid valve 100 will be described.

[0068] Figure 1 FIG. shows a state where no power is supplied to the coil unit 70 (coil). In this case, since no attractive force is generated in the attracting member 80, the plunger 50 is pressed downward in the housing 51 due to the elastic force of the spring 52, and the pilot valve portion 20 (pilot valve seat 42) is set to the closed state (i.e., the pilot passage 45 is closed). In addition, since the pilot valve seat 42 is closed, the pressures in the main valve chamber 33 and the pilot valve chamber 34 are the same, and no pressure difference is generated to raise the main valve core 40. At this time, since the elastic force of the spring 52 is stronger than the elastic force of the main valve core spring 46, the main valve core 40 is pressed downward in the main valve chamber 33, and the main valve seat 35 formed in the valve body 30 is closed by the main valve gasket 41 formed on the lower side of the main valve core 40, and the main valve portion 10 is set to the closed state. In this state, the flow of a fluid such as refrigerant from the inlet 31 to the outlet 32 is blocked.

[0069] When power is supplied from Figure 1When the coil unit 70 (coil 71) is energized in the shown state, the attracting member 80 and the plunger 50 are magnetized, and an electromagnetic attraction force is generated between them, so that the plunger 50 is pulled up against the elastic force of the spring 52. Since the pilot valve core 60 is fixed to the bottom surface of the plunger 50, the pilot valve portion 20 (pilot valve seat 42) becomes an open state.

[0070] In this state, if the compressor (not shown) is operated, the refrigerant flows into the main valve chamber 33 from the inlet port 31. At this time, the refrigerant flows from the main valve chamber 33 to the pilot valve chamber 34 via the pressure equalizing hole 44 (specifically, the clearance between the inner peripheral surface of the threaded cylindrical portion 22b and the outer peripheral surface of the main valve core 40 and the pressure equalizing hole 44), but compared with the amount of refrigerant flowing into the pilot valve chamber 34, the amount of refrigerant flowing out from the pilot valve chamber 34 to the outlet port 32 side via the pilot passage 45 is larger. Therefore, the pressure in the pilot valve chamber 34 is smaller than the pressure in the main valve chamber 33, and a force acting upward is generated on the main valve core 40, and the main valve portion 10 is transferred to the open valve state together with the elastic force of the main valve core spring 46 ( Figure 2 、 3 state). In this state, fluids such as refrigerant flow from the inlet port 31 to the outlet port 32. In addition, in the present embodiment, if the pilot valve portion 20 is in the open state, even when the compressor is in the stopped state, the main valve core 40 will open due to the elastic force of the main valve core spring 46 ( Figure 2 、 3 state).

[0071] In Figure 2 、 3 the shown state (open valve state), when the energization of the coil unit 70 stops, the electromagnetic attraction force of the coil unit 70 on the attracting member 80 disappears, and the plunger 50 is pressed downward by the elastic force of the spring 52. The pilot valve core 60 moves downward together with the plunger 50 and abuts against the pilot valve seat 42, and the pilot valve portion 20 becomes a closed state.

[0072] Since the pilot valve seat 42 is closed, when the refrigerant flows into the pilot valve chamber 34 via the pressure equalizing hole 44, the pressure difference between the pilot valve chamber 34 and the main valve chamber 33 gradually becomes smaller, and the force for moving the main valve core 40 upward becomes smaller. When the pressure difference between the pilot valve chamber 34 and the main valve chamber 33 becomes small enough, the main valve core 40 moves downward due to the elastic force of the spring 52, and the main valve gasket 41 formed on the lower side of the main valve core 40 is pressed against the main valve seat 35 formed in the valve body 30 against the elastic force of the spring 46, so that the main valve portion 10 becomes a closed state ( Figure 1 state).

[0073] Here, the characteristic structure of the present utility model will be described.

[0074] As Figure 4As shown, four recesses 37 are formed on the mounting surface 30a of the valve body 30 by machining or grinding. The four recesses 37 are all linear and extend continuously from the side end of the valve body 30 to the upper large-diameter hole portion 30b. In addition, the four recesses 37 are arranged so as to intersect at right angles at the center of the upper large-diameter hole portion 30b. Specifically, as Figure 4 shown, two pairs of recesses 37 formed on the mounting surface 30a with the center of the upper large-diameter hole portion 30b therebetween both have a common center line C1, C2, and the center line C1 intersects the center line C2 at right angles at the center of the upper large-diameter hole portion 30b.

[0075] The cross-section of the recess 37 orthogonal to the center line C1 (or C2) is rectangular, and the depth (the dimension from the upper surface of the mounting surface 30a to the bottom surface 37a of the recess 37) and the width (the width of the recess 37) are set to be slightly larger than the height (the protruding amount protruding from the bottom surface of the lower plate 73b) and the diameter of the convex portion 74, respectively. In particular, the width of the recess 37 is preferably such a dimension that there is no gap or a slight gap in the transverse direction (the direction toward the side wall of the recess 37) in the state where the convex portion 74 is inserted, and there is no wobbling in the rotational direction in the state where the coil unit 70 is mounted on the valve body 30 side. In addition, since the cross-section of the recess 37 is rectangular, the bottom surface 37a is flat, but the bottom surface shape may also be non-flat.

[0076] In addition, in the state where the coil unit 70 is mounted on the valve body 30, the convex portion 74 is located outside the base portion 22a of the connecting portion 22 (the outer peripheral side when viewed from above) so that the convex portion 74 can be inserted into the recess 37. In addition, there are four positions where the convex portion 74 is inserted into the recess 37 at 90-degree intervals around the axis L, so that the recess 37 into which the convex portion 74 is inserted can be selected from the four according to the direction in which the coil unit 70 is to be fixed. In addition, locking holes 22c are formed at two places on the upper surface of the connecting portion 22, and the locking holes 22c lock a tool when the connecting portion 22 is screwed into the upper large-diameter hole portion 30b of the valve body 30.

[0077] The four recesses 37 of the present embodiment are all formed continuously from the upper large-diameter hole portion 30b of the mounting surface 30a of the valve body 30 to the outer end. That is, by forming the recesses 37 that extend coaxially in the longitudinal and transverse directions with the upper large-diameter hole portion 30b therebetween on the mounting surface 30a, the man-hours for machining (or grinding) can be reduced. In addition, as long as the recess 37 extends continuously from the position where the convex portion 74 is inserted to the upper large-diameter hole portion 30b (accurately, the cylindrical portion above the fastening portion of the upper large-diameter hole portion 30b), the function as the anti-rotation mechanism of the present utility model can be achieved. That is, even if the recess 37 does not extend in the outer direction compared with the insertion position of the convex portion 74, there is no problem in function.

[0078] byFigure 5 It can be seen that when the coil unit 70 is fixed to the other end of the housing 51 via the bolts 75 and the attracting member 80, a gap G1 is formed between the lower plate 73b and the upper surface of the base portion 22a, and a gap G2 is formed between the lower plate 73b and the mounting surface 30a (the surface of the mounting surface 30a where the recess 37 is not formed). The gap G1 and the gap G2 are connected and continuous in the horizontal direction (the direction orthogonal to the axis L). With such a structure, the gap G1 communicates with the outside via the gap G2, so that liquids such as condensed dew that have invaded are easily discharged. That is, even if condensed dew or the like adheres and freezes, it is possible to prevent the occurrence of defects such as position deviation of the coil unit. In addition, as described above, the recess 37 is continuous from the position of the fitting convex portion 74 to the upper large-diameter hole portion 30b, so that the recess 37 is continuous with the gap G1. The condensed dew or the like that has invaded the gap G1 is also discharged from the recess 37.

[0079] In the present embodiment, the height of the gap (designated as G3) between the lower plate 73b and the bottom surface 37a of the recess 37 is set to be larger than the height of the gap G1. The heights of the gaps G1 and G2 are both values greater than 0 (zero). In the present embodiment, the height of the gap G1 is greater than the height of the gap G2, and the height of the gap G3 is set to be greater than the height of the gap G1. Therefore, water such as condensed dew in the gap G1 is easily discharged from the recess 37.

[0080] In the present embodiment, the upper surface of the base portion 22a is located at a position lower than the mounting surface 30a. However, even when the upper surface of the base portion 22a is higher than or at the same height as the mounting surface 30a, as long as the gap G1 and the gap G2 are connected, the water or the like that has invaded the gap G1 is also discharged to the outside via the gap G2 and the gap G3.

[0081] In addition, since the recess 37 is continuous to the upper large-diameter hole portion 30b, the other three recesses 37 that do not fit the convex portion 74 also function as discharge paths for discharging the water accumulated in the gaps G1 and G2 to the outside. According to the above structure, it is easy to discharge the condensed dew from the gaps G1, G2, and G3. Therefore, not to mention preventing rust, it is also possible to effectively prevent the occurrence of defects caused by the freezing of condensed dew or the like. Since the water or the like that has invaded the gap G1 is discharged to the outside, it is difficult for water to invade the gap between the outer periphery of the housing 51 and the coil unit 70, and there is no possibility that the housing 51 is damaged by ice puncture. In addition, although the upper surface of the base portion 22a of the present embodiment is provided as a flat surface, as long as there is a gap G1, it may also be a tapered surface or a stepped flat surface that slopes downward toward the outer peripheral side.

[0082] The following describes other modes of the present utility model.

[0083] The embodiments of the present utility model have been described above, but the present utility model is not limited to these structures and can be variously modified. For example, in the above embodiments, an electromagnetic valve (normally closed electromagnetic valve) that becomes in a valve-closed state when power supply is stopped has been described, but as long as it has a structure with a gap between the base portion 22a of the connecting portion 22 and the housing 73 (lower plate 73b), it can also be applied to a normally open electromagnetic valve. In addition, of course, a locking structure using clips or pins can be adopted instead of the bolt 75 in the above embodiments.

[0084] In the description of the above embodiments, the case where a pilot valve gasket 60 is provided at the top end of the plunger 50 and a main valve gasket 41 is provided on the lower surface of the main valve core 40 has been described, but the present utility model is not limited thereto, and a structure without providing the pilot valve gasket 60 and / or the main valve gasket 41 can also be adopted as long as the pilot valve seat 42 and / or the main valve seat 35 can be well sealed.

[0085] In the above embodiments, four recesses 37 are formed at intervals of 90 degrees on the mounting surface 30a, but the number and angular interval of the recesses 37 can be appropriately changed. For example, it can also be a structure having two recesses at intervals of 180 degrees, two or three recesses at intervals of 90 degrees, or eight or four recesses at intervals of 45 degrees. That is, as long as there are at least a plurality of recesses formed at a specified angular interval. In addition, although the mounting surface 30a in the above embodiments is formed on the entire upper surface of the valve body 30, it can also be the upper surface of a cylindrical portion (in this case, a cylindrical surface) continuously formed from the upper surface of the valve body 30.

[0086] In addition, although the electromagnetic valve in the above embodiments is a pilot-operated electromagnetic valve, the present utility model is not limited to pilot-operated electromagnetic valves, and the fixing structure of the coil unit, which is a characteristic structure of the present utility model, can also be applied to direct-acting electromagnetic valves. For example, a direct-acting electromagnetic valve has the following structure: it does not have a main valve core as in the above embodiments, and the main valve seat is opened and closed by a valve portion mounted on the plunger. In such a direct-acting electromagnetic valve, the fixing structure of the connecting portion and the coil unit mounted on the housing can also be directly adopted.

[0087] In addition, the electromagnetic valve according to the present utility model can typically be preferably used in refrigeration cycle devices having a refrigerant circuit such as air conditioners (air conditioning machines), freezers / refrigerators, etc., but is not limited thereto. In addition, the electromagnetic valve according to the present utility model can also be used in various applications.

Claims

1. A solenoid valve, characterized in that: have: A valve body having a mounting surface, wherein the mounting surface has a connecting hole portion; A shell in the shape of a cylinder; a connecting portion to which one end side of the housing is fixed and which is fastened to a fastening portion formed in the connecting hole; a coil unit fixed to the other end of the housing and having a housing mounted on the coil; a plunger received in the housing and driven by the coil; and a valve core which moves with the plunger, The shell is formed by connecting an upper plate, a lower plate and a side plate connecting the upper plate and the lower plate. The connecting portion has a base, and the base is opposite to the lower plate with a gap (G1), The lower plate has a convex portion protruding toward the mounting surface, The mounting surface includes a recessed portion that fits into the convex portion to restrict the rotation of the housing. The recessed portion is continuous from at least a position where the raised portion is fitted to the connecting hole portion.

2. The solenoid valve according to claim 1, characterized in that: The recessed portion is continuous from the connection hole portion to an end portion of the mounting surface.

3. The solenoid valve according to claim 1, characterized in that: A gap (G1) formed between the lower plate and the base is connected to a gap (G2) formed between the lower plate and the mounting surface in a horizontal direction.

4. The solenoid valve according to claim 2, characterized in that: A gap (G1) formed between the lower plate and the base is connected to a gap (G2) formed between the lower plate and the mounting surface in a horizontal direction.

5. The solenoid valve according to any one of claims 1 to 4, characterized in that: A plurality of the recessed portions are formed at predetermined angular intervals.

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