JPH0640543U - Structure of solenoid valve electrical connection - Google Patents

Abstract

(57) [Summary] [Purpose] To secure the internal space of the receptacle case as wide as possible and realize the structure of the electrical connection part of the solenoid valve that is satisfactory in terms of strength. A structure in which a pair of receptacle cases are housed back to back inside a terminal box having a hermetic structure, and the solenoid plunger device of an electromagnetic valve and external wiring are connected by the receptacle case. The case has the same outer shape, and has a concavo-convex engaging piece that fits with each other on the back surface of the top wall.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of an electrical connection part of a solenoid valve, and in particular, a pair of receptacle cases are housed back to back inside a terminal box having a hermetically sealed structure, and a solenoid plunger device for a solenoid valve and an external unit are provided by the receptacle case. The present invention relates to the structure of the electrical connection part of a solenoid valve for hydraulic equipment that is designed to be connected to wiring.

[0002]

[Prior art]

 FIG. 8 is an exploded perspective view showing a structure of an electrical connection portion of a conventional solenoid valve, in which a bottomed terminal box 2 is mounted and fixed on an upper surface of a solenoid valve body 1 having a solenoid plunger device (not shown). A pair of receptacle cases 3 are housed back to back inside the box 2, and the upper surface of the terminal box 2 is covered with a lid 4. Terminal screws 5 are provided on the upper surface of the receptacle case 3 so as to be spaced apart from each other in the left-right direction so as to form a recess communicating in the front-back direction. Are arranged to indicate electricity, and each of the receptacle cases has a completely closed wall structure in which all internal circuit elements and the like are individually covered with a wall to prevent dust.

[0003]

[Problems to be solved by the device]

 In the conventional structure shown in FIG. 8, when the pair of receptacle cases are housed in the bottomed terminal box 2 and the terminal screws 5 are tightened, the reaction force is individually supported by each receptacle case. Therefore, the strength of the case was a problem. Further, when the pair of receptacle cases 3 are housed back to back in the terminal box 2, the back wall of each case becomes a double structure and occupies a wasteful space, thus narrowing the circuit component storage space in the case. pointed out.

The present invention intends to realize a structure in which the internal space of the receptacle case is as wide as possible and the strength is satisfactory.

[0005]

[Means for Solving the Problems]

 According to the first aspect of the present invention, a pair of receptacle cases are housed back to back inside a terminal box having a hermetically sealed structure, and the solenoid plunger device of the electromagnetic valve and external wiring are connected by the receptacle case. In the above-mentioned one, a pair of concave and convex engaging pieces are provided on the back surfaces of the upper surface walls of the pair of receptacle cases, and both cases are formed in the same outer shape.

According to the second aspect of the present invention, the partition wall serving as a partition between the receptacle cases is formed in the terminal box so that the upper edge is located immediately below the concave and convex engaging pieces of the receptacle cases in the stored state. It is integrally formed on the inner surface.

[0007]

[Action]

 In the present invention, a pair of receptacle cases housed back to back have the same outer shape in the terminal box, and a concavo-convex engaging piece is provided on the back surface of the upper wall of each receptacle case so as to fit with each other. Therefore, in the state of being housed in the box, each case is integrated by being fitted with each other by the concavo-convex engaging pieces on the back surface of the top wall. Therefore, the reaction force when tightening the terminal screws can be supported by the pair of receptacle cases that are integrated with each other, and stress concentration is avoided, so that damage is less likely to occur.

According to the second aspect of the present invention, a single partition wall is formed on the inner surface of the terminal box so as to reach directly below the concavo-convex occlusal pieces of a pair of back-to-back receptacle cases. In the storage state without forming a back wall, the partition wall forms a partition wall that makes the inside of each receptacle case a substantially closed space, and the concavo-convex bite of both cases is supported on the upper edge of this partition wall. There is no concern about the strength of the cases, and the space inside each case can be increased by one wall.

[0009]

【Example】

 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view, and FIG. The device 12 is mounted. On the upper surface of the solenoid valve body 11 is mounted a terminal box 13 which is internally fixed to the body by a mounting screw 16. Inside the terminal box 13, a pair of receptacle cases 14 having the same shape are assembled back to back. It is stored. The upper surface of the terminal box 13 that houses the receptacle case 14 is sealed by a lid 4, and the lid 4 is screwed to the upper surface of the terminal box 14.

Each terminal box 13 is made of an integrally molded product of resin such as die casting or self-extinguishing property, and its outer peripheral surface has an upper portion of an insertion hole 17 of a bolt for fixing the solenoid valve body 11 to a manifold or the like. A recess 18 is provided at a position corresponding to each hole 17 so as not to form a portion projecting into the space, so that it is necessary to touch the inside of the terminal box 13 while being fixed to the solenoid valve body 11. The rotation of the bolt in the hole 17 can be handled without using a wrench or the like.

As shown in FIG. 3, screw holes 19 are provided on both end faces of the terminal box 13 so that a conduit from an external power source or the like can be inserted and the plug can be fixed. Each of the holes 20 is provided so that the pin 22 of the connection plug 21 connected to the coil of the solenoid plunger device 12 can be inserted into the terminal box through the through hole.

As shown in FIGS. 3 and 4, thick portions 23 are integrally formed at the centers of both sides of the bottom surface of the terminal box 13, and the thick portions 23 have through holes penetrating the bottom surface. The mounting screws 16 are inserted into the through holes, and the lower portions of the mounting screws 16 are screwed into the solenoid valve body 11, so that the heads of the mounting screws 16 and the upper surfaces of the thick-walled portions 23. It is designed to be fastened by engagement with. In this case, preferably, as shown in FIG. 5, an annular protrusion 25 is integrally formed on the upper hole edge of the through hole 24, and the annular protrusion 25 is crushed by the lower surface of the head of the mounting screw 16 during the fastening. By doing so, the seal in the through hole 24 can be fulfilled at the same time as the fastening.

As shown in FIG. 4, the internal space of the terminal box 13 has a bilaterally symmetrical plane shape, and a partition wall 26 is integrally formed at a position that divides it into left and right parts. As shown in FIG. 1, in the space, a pair of receptacle cases 14 having an outer peripheral shape that matches the planar shape of the bisection space can be housed in a back-to-back assembled state.

As shown in FIG. 6, each receptacle case 14 has a concavo-convex occlusal piece 27 on the back surface of the upper surface wall, and the upper edge of the partition wall 26 has both receptacle cases 14 in the terminal box 13. When properly stored, it reaches directly below the concavo-convex bite piece 27 of each receptacle case 14. For this reason, the receptacle case 14 itself is not provided with a back wall that does not affect the strength at all, and instead the partition wall 26 forms a partition wall that makes the inside of each receptacle case 14 a substantially closed space. It is supposed to form.

FIG. 7 is a top view showing a state in which a pair of receptacle cases 14 are housed back to back in the terminal box 13. In the receptacle case 14 housed in the state as shown in FIG. 7, the stress generated when tightening the terminal screws 28 located on the left and right of the upper surface is engaged with each other by the concavo-convex engaging pieces 27 on the back surface of the upper surface wall. It is reduced to the other party's receptacle case 14 and terminal box 13.

[0016]

[Effect of device]

 As described above, according to the first aspect of the present invention, the concavo-convex engaging piece is provided on the back surface of the upper wall of each receptacle case, so that the reaction force when the terminal screw is tightened is integrated. Since it can be supported by a pair of receptacle cases, stress concentration is avoided and damage is less likely to occur.

According to the second aspect of the present invention, each of the receptacles is formed by integrally forming one partition wall on the inner surface of the terminal box so as to reach directly below the concavo-convex engaging piece of the pair of back-to-back receptacle cases. Even when the case itself is not provided with a back wall, the partition walls form a partition wall that substantially closes the inside of each receptacle case in the stored state, and the concavo-convex engaging pieces of both cases are supported on the upper edge of the partition wall. By doing so, there is no concern about the strength of the case, and the space in each case can be expanded by one wall.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an embodiment of the present invention.

FIG. 3 is an explanatory view showing a configuration of a side end surface side of the terminal box with the left side from the center line as a cross-sectional view and the right side as a side view.

FIG. 4 is a plan view of a terminal box.

FIG. 5 is a partial cross-sectional view showing a sealing mechanism of a mounting screw at the bottom of the terminal box.

FIG. 6 is a plan view of a receptacle case having a concavo-convex occlusion piece.

FIG. 7 is a plan view showing a state in which a pair of receptacle cases are housed back to back in a terminal box.

FIG. 8 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 11: Solenoid valve body 13: Terminal box 14: Receptacle case 15: Lid 28: Terminal screw 12: Solenoid plunger device 26: Partition wall 27: Concavo-convex bite piece

Claims (2)

[Scope of utility model registration request] 1. A pair of receptacle cases are housed back to back inside a terminal box having a hermetically sealed structure, and a solenoid plunger device of an electromagnetic valve and external wiring are connected by the receptacle case. The structure of the electrical connection portion of the solenoid valve is characterized in that the receptacle case is formed in the same outer shape having concavo-convex engaging pieces on the back surface of the upper surface wall. 2. A partition wall serving as a partition between the receptacle cases is integrally formed on the inner surface of the terminal box so that the upper edge is located directly below the concave and convex engaging pieces of the receptacle cases in the stored state. The structure of the electrical connection portion of the solenoid valve according to claim 1.