JP2597378Y2 - Explosion-proof solenoid valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof solenoid valve, and more particularly, to easily and securely fix a housing of a drive unit without increasing the size of a housing, regardless of the piping direction to a valve body. The present invention relates to an explosion-proof solenoid valve which can be used.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG. 5, for example, an explosion-proof solenoid valve comprises a valve body 101, a driving section 104 for driving a valve 103 accommodated in a valve box 102 of the valve body 101, Department
And a housing 105 for covering 104. This housing
Reference numeral 105 denotes a cup-shaped body 106, a terminal box 107 connected to the body 106, and a lid 108 for covering an upper end opening of the body 106, and is inserted through a hole 109 formed in the bottom wall of the body 106, Plunger tube assembly 110 screwed into
The nut 111 is connected to the valve box 102.

[0003] A gap is provided between the bottom wall of the housing 105 and the valve box 102 and the plunger tube assembly 110 which is smaller than the maximum gap for maintaining explosion-proof performance so that the housing 105 can rotate with respect to the valve box 102. ing. Housing 105 against rotation of housing 105
Only the frictional force generated by the elasticity of the O-ring 112 for the purpose of sealing between the O-ring 112 and the plunger tube assembly 110 acts as resistance.

The driving section 104 includes a coil 113 and a yoke 11
4 and yoke 114 to plunger tube assembly 11
And a spring 115 that presses against the zero nut 111. The plunger 116 of the plunger tube assembly 110 is inserted into the center hole of the nut 111 and the coil 113 so as to be able to advance and retreat and to be rotatable.
The coil 113 and the yoke 114 are joined together with the housing 105 to the plunger tube assembly 110 and the valve box 10.
You can now rotate about 2.

On the outside of the terminal box 107, a joint 117 for screwing a conduit for external wiring is fixed.
Insertion holes 118 for introducing external wiring into the terminal box 107 are formed in the terminal box 107 and the terminal box 107. One of the external wires is body-grounded to the terminal box 107 inside the terminal box 107, and the other is connected to the lead wire 119 of the coil 113 via the internal terminal.

[0006]

In the conventional explosion-proof solenoid valve, it is not necessary to rotate the housing 105 after the piping work to change the drawing direction of the conduit, but in an environment where vibration is applied, the housing 105 is not required. Bottom wall and valve box 102 and plunger tube assembly 110
, The housing 105 slightly moves with respect to the valve box 102 and the plunger tube assembly 110.

When vibration is continuously applied to the explosion-proof solenoid valve for a long period of time, the fine movement causes wear on the housing 105, the valve box 102, and the plunger tube assembly 110, and the gap between them deteriorates the explosion-proof performance. The gap may be larger than the maximum gap required for the explosion, and the explosion-proof performance may be impaired. For example, as shown in the cross-sectional view of FIG. By tightening, it has been devised that fine movement of the housing 105 with respect to the valve box 102 and the plunger tube assembly 110 is eliminated.

However, in the explosion-proof solenoid valve according to the prior invention, the shape of the housing 105 becomes complicated and large, and the set screw 121 becomes difficult to operate due to the piping connected to the valve body 101. May become inoperable. The present invention has been made in view of the above circumstances, and can easily and reliably fix the housing of the drive unit without increasing the size of the housing, regardless of the piping direction to the valve body. An object of the present invention is to provide an explosion-proof solenoid valve as described above.

[0009]

According to the present invention, there is provided an explosion-proof electromagnetic device in which a housing of a drive unit is rotatably connected to a valve box of a valve body, and a detent means for preventing rotation of the housing relative to the valve box is provided. In the valve, in order to achieve the above object, the rotation preventing means is provided with a number of engagement projections provided over the entire circumference in the rotation direction of the housing, and is screwed to the outer surface of the valve box to be engaged with the engagement projections. And a locking member that engages.

[0010]

In the present invention, since the engaging projection is formed on the outer periphery of the housing, it is not necessary to make the housing large. Further, since the locking member engaged with the engagement protrusion can be screwed to an arbitrary side surface of the valve box, by appropriately selecting an installation position corresponding to the piping direction of the valve body, the locking member to the valve box can be fixed. Regardless of the piping direction, the screw for screwing the locking member can be easily occupied.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. However, the present invention is not limited to the embodiments, and the present invention will be described with reference to the accompanying drawings. The invention is broadly applicable throughout the full intended range. As shown in the sectional view of FIG. 1 and the side view of FIG. 2, an explosion-proof solenoid valve according to one embodiment of the present invention drives a valve body 1 and a valve 3 housed in a valve box 2 of the valve body 1. And a housing 5 that covers the driving unit 4.

The housing 5 has a cup-shaped body 6, a terminal box 7 fixed to one side of the body, and a body 6.
And a lid 8 covering the upper end opening of the plunger. The lid 8 is inserted into a hole 9 formed in the bottom wall of the body 6 and connected to the valve box 2 by a nut 11 of a plunger tube assembly 10 screwed to the valve box 2. . A gap is provided between the bottom wall of the housing 5 and the valve box 2 and the plunger tube assembly 10 which is smaller than the maximum gap capable of maintaining the explosion-proof performance.
Can rotate with respect to the valve box 2.

[0013] With respect to the rotation of the housing 5, only the frictional force generated by the elastic force of the O-ring 12 for the purpose of sealing between the housing 5 and the plunger tube assembly 10 acts as a resistance. The driving unit 4 includes a coil 13 and a yoke.
14 and a spring 15 for pressing the yoke 14 against the nut 11 of the plunger tube assembly 10.

The plunger 16 of the plunger tube assembly 10 is inserted into the center hole of the nut 11 and the coil 13 so as to be able to advance and retreat and to be rotatable.
The coil 13 and the yoke 14 can be rotated together with the housing 5 with respect to the plunger tube assembly 10 and the valve box 2. A joint 17 for screwing a conduit for external wiring is fixed outside the terminal box 7, and an insertion hole 18 for introducing external wiring into the terminal box 7 is formed in the joint 17 and the terminal box 7.

One of the external wires is body-grounded to the terminal box 7 in the terminal box 7, and the other is connected to the lead wire 19 of the coil 13 via the internal terminal. The explosion-proof solenoid valve further includes a detent means 20 for preventing rotation of the housing 5 with respect to the valve box 2, and the detent means 20 includes a plurality of engagements formed over the entire outer periphery of the lower end of the housing 5. The projection 21 and the engagement projection
21 and a screw 23 for fixing the locking member 22 to the outer surface of the valve box 2. As shown in the perspective view of FIG. 3 and the plan view of FIG. A spring 24 is provided for urging the locking member 22 supported by the valve box 2 via the screw 23 in a direction away from the valve box 2.

Since the engaging projection 21 is formed simply by forming a gear at one end of the housing 5, the housing 5 does not become large. Also, the locking member
Any shape can be selected as the shape of 22, for example, or it can be formed in a block shape in which a concave portion into which a plurality of engaging projections 21 are inserted is formed. In order to reduce the component cost, the locking member 22 is formed by a plate member including a main body 25 bent into a U-shape or a U-shape and a screw seat 26 extended from one side of the main body 25. Make up.

At the time of piping, the screw 23 is loosened, the locking member 22 is separated from the valve box 22 by the spring 24, and the engagement between the locking member 22 and the engaging projection 21 is released. When the screw 23 is tightened after piping, the main body 25 of the locking member 22 is positioned at the corresponding position.
21 to prevent rotation of the housing 5 with respect to the valve box 2.

Here, the valve box 2 for screwing the locking member 22 is used.
Is not particularly limited, and therefore, any position other than the piping position to the valve box 2, in this case, as shown in FIG. 1, is opposite to the side surface on which the piping connection ports 27 to 30 of the valve box 2 are arranged. The locking member 20 is disposed on the side surface on the side. Thereby, the operation of the screw 23 can be performed easily and reliably regardless of the piping to the valve box 2.

Since the spring 24 for urging the locking member 22 in the direction away from the valve box 2 and the engagement projection 21 is supported by the valve box 2, the locking member 22 is fixed by the spring 24 during piping. If the housing 5 is separated from the valve box 2 and the engagement projection 21, the housing 5 can be rotated.
It does not need to be removed from This eliminates the risk of losing the locking member 22 and the screw 23 during the piping work, and in the subsequent fixing work of the housing 5, the housing 5 can be easily mounted simply by turning the locking member 22 and screwing the screw 23. Can be fixed.

[0020]

As described above, according to the present invention, since the engaging projections of the rotation preventing means are provided over the entire circumference in the rotation direction of the housing, it is not necessary to increase the size of the housing. Since the locking member to be engaged with the mating projection is screwed to the outer surface of the valve box, by arranging this screwing position at a position different from the haiku position of the valve box,
Regardless of the piping direction of the valve box, the screw can be easily and securely operated to fix the housing.

In the present invention, particularly when the valve box supports a spring for urging the locking member in a direction away from the valve box and the engaging projection, the locking member is spring-loaded at the time of piping. Since the locking member and the screw do not have to be removed from the valve box, there is no risk of losing the locking member and the screw during piping work, and the subsequent fixing work of the housing is simplified. This is advantageous.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a side view of the embodiment of the present invention.

FIG. 3 is a perspective view of a main part of one embodiment of the present invention.

FIG. 4 is a plan view of a main part of one embodiment of the present invention.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is a sectional view of the prior invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Valve box 5 ... Housing 20 ... Detent means 21 ... Engagement protrusion 22 ... Locking member 23 ... Screw 24 ... Spring

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 27/00-31/11

Claims (2)

(57) [Scope of request for utility model registration] 1. An explosion-proof solenoid valve in which a housing of a drive unit is rotatably connected to a valve box of a valve body and provided with a rotation preventing means for preventing rotation of the housing with respect to the valve box. An explosion-proof electromagnetic valve, comprising: a number of engagement projections provided over the entire circumference in the rotation direction of the housing; and a locking member screwed to the outer surface of the valve box and meshing with the engagement projections. 2. The explosion-proof solenoid valve according to claim 1, wherein a spring for urging the locking member in a direction away from the valve box and the engagement projection is supported by the valve box.