JPH1114487A - Structure of cabinet of explosion-proof instrument with display window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembly operability and to reduce the weight of a translucent part and cost by processing the outer peripheral surface of the translucent part so that the gap between a cabinet and the outer peripheral surface of the translucent part may become a standardized size to satisfy the gap and depth of explosion proof. SOLUTION: The outer peripheral surface of a translucent part 3 is processed so that the gap between a cabinet 1 with a window hole 2 for display and the outer peripheral surface of a plate-shaped translucent part 3 fitted into the cabinet 1 may become a standardized size to satisfy the gap 5 and depth L of explosion-prooving. The outer periphery of a tempered glass heat-treated in advance is highly accurately processed by diamond grinding to manufacture the translucent part 3. At the stage that the highly accurately processed translucent part 3 is fitted into the cabinet 1, the above-mentioned gap satisfies the gap 5 and depth L based on an explosion- prooving standard. Therefore, as the translucent part 3 with the same thickness as the depth L based on the explosion-prooving standard is satisfactory, it is possible to reduce its weight and cost. As the gap 5 can be cleared without using a sticking agent formed of a resin adhesive agent, it is possible to improve assembly operability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of an explosion-proof instrument having a display window such as a differential pressure type pressure transmitter.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a housing structure of a conventional explosion-proof instrument with a display window. In the drawing, reference numeral 1 denotes a cylindrical housing of the explosion-proof instrument; Is a translucent component formed to be larger than the display window hole 2 and fitted into the housing 1. The translucent component 3 is a heat-treated reinforced component. It is common to use glass.

[0003] Reference numeral 4 denotes a sealing member for sealing between the housing 1 and the translucent component 3, and 5 denotes a sealing member formed between the outer peripheral surface of the translucent component 3 and the inner peripheral surface of the housing 1. The translucent component 3 is fixed in the housing 1 by injecting and solidifying a fixing agent 6 made of a resin adhesive or the like into the gap 5.

[0004] In the above, when the translucent component 3 is fitted and fixed in the housing 1, in order to prevent the flame when an explosion occurs in the housing 1 from coming out, the housing 1 is transparent. The gap 5 between the optical component 3 and the depth L, which is the fixing distance required for filling the gap 5 with the fixing agent 6, has a standard dimension based on explosion-proof standards, and the standard dimension must be satisfied. There is a condition that must be.

Therefore, when the translucent component 3 is fitted and fixed in the housing 1, a fixing agent 6 is injected into the gap 5 and solidified so as to make the standard condition of the gap 5 zero. Further, the translucent component 3 used at this time is made thicker than the depth L so as to satisfy the standard condition of the depth (fixed distance) L.

[0006]

The housing structure of a conventional explosion-proof instrument with a display window is constructed as described above.
It takes a long time to inject and solidify the fixing agent 6, and the workability is very poor. In addition, the thickness of the translucent component 5 must be increased in order to satisfy the condition of the depth L according to the explosion-proof standard. There were problems such as bulkiness and high cost. Furthermore, since the translucent component 3 is fixed to the housing 1 with a fixing agent 6 such as a resin adhesive, the translucent component 3 cannot be replaced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is not necessary to particularly increase the thickness of a light-transmitting component. It can be used, and can assemble translucent parts in a short time without the need for a bonding agent such as a resin adhesive. This improves the workability of assembly, reduces the weight of translucent parts, and reduces costs. An object of the present invention is to obtain a housing structure of an explosion-proof instrument with a display window that can be downed.

[0008]

A housing structure of an explosion-proof instrument with a display window according to the present invention comprises a housing having a display window hole, a plate-shaped translucent component fitted in the housing. The outer peripheral surface of the translucent component is processed so that the gap between the two has a standard size that satisfies the explosion-proof gap and depth.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a cross-sectional view showing a housing structure of an explosion-proof instrument with a display window according to Embodiment 1 of the present invention. The same or corresponding parts as in FIG. In FIG. 1, the translucent component 3 is formed by processing the outer periphery of a tempered glass that has been heat-treated in advance by diamond polishing with high precision. At the stage of fitting, the gap 5 and the depth L according to the explosion-proof standard are filled. Therefore, the translucent component 3 only needs to have the same thickness as the depth L according to the explosion-proof standard, so that the weight and cost can be reduced and the gap 5 can be formed without using a fixing agent made of a resin adhesive. , The assembly workability is greatly improved.

In the first embodiment, an engaging groove 1a is formed on the inner peripheral surface of the housing 1, and a wave ring 7 and a washer (C ring) 8 are combined to form a fixing member 9. The translucent component 3 is fixed to the housing 1 with the fixing member 9 by fitting the fixing member 9 into the engagement groove 1a. Therefore, as described above, the translucent component 3 can be easily assembled to the housing 1 without the need for a fixing agent, and the assembling work time can be reduced.

Embodiment 2 FIG. 2 is a cross-sectional view showing a housing structure of an explosion-proof instrument with a display window according to Embodiment 2 of the present invention. The same or corresponding parts as in FIGS. I do. Embodiment 2
Then, the screw portion 1b is provided on the non-fitting surface of the translucent component 3 on the inner peripheral surface of the housing 1, and the tightening ring 10 is screwed into the screw portion 1b to be fitted into the housing 1. The light-transmitting part 3 is fastened and fixed. Therefore, in the case of the second embodiment, the same effect as that of the first embodiment can be obtained.

[0012]

As described above, according to the present invention, the gap between the explosion-proof standard and the depth between the casing having the display window and the plate-shaped translucent component fitted in the casing is provided. The outer peripheral surface of the translucent component is processed so as to have a standard size that satisfies the following conditions, and the translucent component is fitted and fixed in the housing, so that the translucent component has the same thickness as the depth according to the explosion-proof standard. Just insert and fix the translucent component in the housing using the optical component,
It is possible to easily and quickly assemble a light-transmitting component that clears the gap and depth without the need for a fixing agent. There are effects such as weight reduction of parts and cost reduction. Further, as described above, since the translucent component can be fitted and fixed in the housing without the need for the fixing agent, there is an effect that the translucent component can be replaced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a housing structure of an explosion-proof instrument with a display window according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing a housing structure of an explosion-proof instrument with a display window according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view showing a housing structure of a conventional explosion-proof instrument with a display window.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Display window hole 3 Translucent component 4 Seal member 5 Gap 9 Fixing member

Claims (1)

[Claims] 1. An instrument body housing having a display window,
A plate-shaped light-transmitting component formed to be larger than the display window hole and fitted into the housing to cover the display window hole from the inside of the housing; In a housing structure of an explosion-proof instrument with a display window, comprising a sealing member for sealing a gap therebetween, and a fixing member for fixing the translucent component in the housing, the housing is fitted into the housing. An explosion-proof type with a display window, wherein an outer peripheral surface of the light-transmitting component is processed such that a gap between the light-transmitting component and an outer peripheral surface thereof has a standard size that satisfies an explosion-proof gap and depth. Instrument housing structure.