Corrosion-resistant double-layer explosion-proof box

Abstract

The utility model relates to the field of electrical system safety explosion-proof equipment, and specifically to a corrosion-resistant double-layer explosion-proof box. It includes an inner box body made of metal material and an outer box body made of plastic material, and the electrical components are arranged in the inner box body; a control knob is arranged on the outer box body, and the control knob is connected to a control shaft, and the control shaft passes through the box wall of the outer box body and the box wall of the inner box body and is connected to the electrical components; an outer through hole is arranged on the box wall of the outer box body, and an inner through hole is arranged on the box wall of the inner box body, and the control shaft is passed through the outer through hole and the inner through hole; an inner bushing is sleeved on the control shaft, and an outer bushing is sleeved on the inner bushing; an outer sealing ring is arranged on the outer end surface of the outer bushing and the inner bushing, and the outer sealing ring covers the gap between the outer bushing and the inner bushing, and a clamping ring is arranged on the outer side of the outer sealing ring, and the control knob is pressed on the outer end of the clamping ring, and the inner end of the clamping ring presses against the outer sealing ring. Through the above settings, an explosion-proof box design with simple processing technology and excellent anti-corrosion and explosion-proof performance is proposed.

Description

Technical Field

[0001] The utility model relates to the field of safety explosion-proof equipment for electrical systems, in particular to a corrosion-resistant double-layer explosion-proof box. Background Art

[0002] Explosion-proof boxes are commonly used electrical safety protection equipment in industry. They are often used in factories with a lot of dust, such as factories that provide food, or factories with a lot of flying catkins, such as textile and garment processing factories. They are also commonly used in chemical plants containing flammable and explosive gases, such as petrochemical processing plants.

[0003] If the explosion-proof box is used in corrosive environments such as seawater, industrial wastewater, and waste acid, the common aluminum or cast iron explosion-proof box is easily corroded. When the corrosion is light, the seal of the lead-out interface of the explosion-proof box will deteriorate and fail, and the control knob or button will be blocked and affect the rebound. Severe corrosion will cause the control knob or button to fail to operate, and even damage the box structure, and the explosion-proof level will be reduced, causing accidents.

[0004] When using explosion-proof boxes in corrosive environments, the existing technology generally starts with the box material, using corrosion-resistant stainless steel or weathering steel to manufacture the explosion-proof box body. However, stainless steel itself is relatively expensive, heavy and difficult to process. For example, stainless steel needs to be machined, which is costly and has high requirements for factory equipment. Utility Model Content

[0005] In view of the above-mentioned deficiencies or defects in the prior art, the utility model provides a corrosion-resistant double-layer explosion-proof box, which is easy to manufacture, and the two boxes can be manufactured independently and finally assembled. The outer box provides an anti-corrosion function, and the inner box plays an explosion-proof function.

[0006] The corrosion-resistant double-layer explosion-proof box includes an inner box body made of metal and an outer box body made of plastic nested outside the inner box body, wherein the electrical components are arranged in the inner box body; a control knob is arranged on the outer box body, and a control shaft is connected to the control knob, and the control shaft passes through the box wall of the outer box body and the box wall of the inner box body and is connected to the electrical components.

[0007] An outer through hole is provided on the box wall of the outer box body, an inner through hole is provided on the box wall of the inner box body, and the control shaft passes through the outer through hole and the inner through hole.

[0008] An inner sleeve is sleeved on the control shaft, and an outer sleeve is sleeved on the inner sleeve. The outer sleeve has an interference fit with the outer through hole and the inner through hole. An outer sealing ring is arranged on the outer end faces of the outer sleeve and the inner sleeve, and the outer sealing ring covers the gap between the outer sleeve and the inner sleeve. A clamping ring is arranged on the outer side of the outer sealing ring, and the control knob is pressed on the outer end of the clamping ring, and the inner end of the clamping ring presses against the outer sealing ring.

[0009] Preferably, inner ends of the outer sleeve and the inner sleeve are further provided with inner sealing rings, and the inner sealing rings cover the gap between the outer sleeve and the inner sleeve.

[0010] Preferably, the inner through hole of the inner box body is provided with a supporting structure, and the inner sealing ring is pressed on the supporting structure to support the inner bushing and the outer bushing.

[0011] Preferably, the inner sealing ring and the outer sealing ring are made of plastic.

[0012] Preferably, the control knob is mounted on the outer box body by bolts, and a gap is left between the bottom of the control knob and the outer box body; the outer end of the clamping ring extends out of the outer box body and contacts the bottom of the control knob, and the control knob presses the clamping ring downward.

[0013] Preferably, the outer end of the clamping ring has a flange extending outward, and a gap is reserved between the flange of the clamping ring and the box wall of the outer box body.

[0014] Preferably, a plastic sleeve is provided between the clamping ring and the outer through hole.

[0015] The above-mentioned technical solution of the utility model provides a corrosion-resistant double-layer explosion-proof box, which has the following effects:

[0016] The inner box is made of the same process as the general aluminum box and cast iron, and is directly cast. The electrical components are set in the inner box made of metal. The inner box provides explosion-proof function to prevent the electric spark leakage of the electrical components, and the metal box structure has high strength and high explosion-proof grade.

[0017] The manufacturing process of plastic boxes is very mature, and the outer box made of plastic can be directly manufactured by injection molding. The outer box made of plastic is put on the inner box to form a shielding layer to isolate the inner box from corrosive liquids.

[0018] To control the electrical components in the inner box, it is necessary to set control knobs or control buttons on the outer wall of the outer box. These control knobs are connected to the electrical components 3 through control shafts to control the electrical components 3. The control shaft runs through the box walls of the inner box and the outer box.

[0019] In order to prevent the corrosive liquid from leaking between the inner box and the outer box, especially to prevent further leakage into the inner box. Therefore, a corresponding anti-leakage sealing structure is set at the connection between the control shaft and the inner box and the outer box. Specifically, two layers of bushings are arranged outside the control shaft, namely the inner bushing and the outer bushing. The outer bushing is fixed on the inner and outer vias by interference fit. The inner hole of the inner bushing and the control shaft have a relatively high precision, and it can be assumed that no leakage will occur. Therefore, possible leakage will occur in the gap between the inner bushing and the outer bushing.

[0020] Therefore, an outer sealing ring is also arranged on the outer end surface of the outer bushing and the inner bushing, and the outer sealing ring covers and blocks the gap between the outer bushing and the inner bushing. Then, the control knob body is used to apply pressure to the clamping ring, and finally the clamping ring presses the outer sealing ring onto the end surface of the inner and outer bushings.

[0021] Other features and advantages of the utility model will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the internal structure of the corrosion-resistant double-layer explosion-proof box of the utility model;

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0024] Description of Reference Numerals

[0025] 1-inner box; 2-outer box; 3-electrical components; 4-control knob; 5-control shaft; 6-inner bushing; 7-outer bushing; 8-outer sealing ring; 9-inner sealing ring; 10-pressure ring; 11-plastic sleeve. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0027] In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" usually refer to the orientation in the assembled state. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] In order to solve the problem of high cost and difficulty in processing the traditional corrosion-resistant explosion-proof box mentioned in the background technology part, the utility model provides a corrosion-resistant double-layer explosion-proof box, such as Figure 1As shown, the corrosion-resistant double-layer explosion-proof box includes an inner box body 1 made of metal material, and an outer box body 2 made of plastic material nested outside the inner box body 1. The inner box body 1 is the same as an ordinary cast metal explosion-proof box, including a box body and a box cover. The outer box body 2 is the same as a common low-explosion-proof plastic explosion-proof box, which is formed by plastic injection molding and also includes a box body and a box cover. The plastic material itself has good corrosion resistance. The outer box body 2 is used to protect the inner box body 1 to prevent the corrosion of the inner box body 1 from affecting the explosion-proof performance of the inner box body 1.

[0030] The electrical components 3 are arranged in the inner box 1. The explosion-proof box itself needs to have sufficient structural strength to achieve the purpose of explosion-proof. Therefore, the material of the inner box 1 is selected from metal materials, which have high structural strength and controllable cost. Preferably, aluminum and cast iron materials are included, which are easy to shape, have mature processing technology, and have sufficient strength to meet the explosion-proof requirements.

[0031] The outer box body 2 is provided with a control knob 4, and the control knob 4 includes a base industry knob. The base is fixed on the outer box body 2, and the control shaft 5 is rotatably arranged on the base, and the knob is connected to the control shaft 5. The person rotates the knob to drive the control shaft 5 to rotate. The control shaft 5 penetrates the box wall of the outer box body 2 and the box wall of the inner box body 1 and is connected to the electrical component 3.

[0032] An outer through hole is provided on the wall of the outer box body 2, an inner through hole is provided on the wall of the inner box body 1, and the control shaft 5 is passed through the outer through hole and the inner through hole. In order to prevent the corrosive liquid from leaking into the inner box body 1 from the gap between the inner through hole, the outer through hole and the control shaft 5. Therefore, an inner bushing 6 is sleeved on the control shaft 5, and an outer bushing 7 is sleeved on the inner bushing 6. The outer bushing 7 has an interference fit with the outer through hole and the inner through hole; an outer sealing ring 8 is provided on the outer end surface of the outer bushing 7 and the inner bushing 6, and the outer sealing ring 8 covers the gap between the outer bushing 7 and the inner bushing 6. A clamping ring 10 is provided on the outer side of the outer sealing ring 8, and the control knob 4 is pressed on the outer end of the clamping ring 10, and the inner end of the clamping ring 10 presses against the outer sealing ring 8.

[0033] In actual use, a small amount of corrosive liquid leaks between the inner box 1 and the outer box 2. It will only slightly corrode the surface of the inner box 1 and will not have a substantial impact. However, if it leaks into the inner box 1, it will have a serious impact. Therefore, an inner sealing ring 9 is also provided at the inner end of the outer bushing 7 and the inner bushing 6, and the inner sealing ring 9 covers the gap between the outer bushing 7 and the inner bushing 6. In addition, the inner through hole of the inner box 1 is provided with a support structure, and the inner sealing ring 9 is pressed on the support structure to support the inner bushing 6 and the outer bushing 7. Figure 2 As shown in the figure, the corrosive liquid leaking between the inner box 1 and the outer box 2 will first gather at the bottom of the outer box 2. Only a small amount of liquid located at the inner through hole may leak into the inner box 1. The present application uses the inner liner 6 and the outer liner 7 to press the inner seal ring 9, and the inner seal ring 9 presses the support structure. The channel for the liquid to enter the inner box 1 is closed.

[0034] Specifically, the inner sealing ring 9 and the outer sealing ring 8 are made of plastic. In addition, the inner sealing ring 9 and the outer sealing ring 8 have good elasticity and can be made of PC or PVC material.

[0035] Through the above arguments and Figure 2 It can be seen that the clamping ring 10 needs to press down the outer sealing ring 8, and then the outer sealing ring 8 can compress the inner bushing 6 and the outer bushing 7, and then the inner bushing 6 and the outer bushing 7 compress the inner sealing ring 9, and the inner sealing ring 9 is in the compression support mechanism. Therefore, the control knob 4 is installed on the outer box body 2 by bolts, and a gap is left between the bottom of the control knob 4 and the outer box body 2; the outer end of the clamping ring 10 extends out of the outer box body 2 and contacts the bottom of the control knob 4, and the control knob 4 presses the clamping ring 10 downward. Specifically, the base of the control knob 4 compresses the outer sealing ring 8, and the control shaft 5 can be simply rotated and installed on the base.

[0036] In order to improve the stability of the base of the control knob 4, the outer end of the clamping ring 10 has a flange extending outward, which expands the contact area between the control knob 4 and the clamping ring 10. A gap is reserved between the flange of the clamping ring 10 and the box wall of the outer box body 2 to prevent the flange of the clamping ring 10 from transmitting the clamping stress to the outer box body 2.

[0037] A plastic sleeve 11 is arranged between the clamping ring 10 and the outer through hole. The plastic sleeve 11 is mainly used to prevent the clamping ring 10 from shaking, so that the clamping ring 10 can only apply stress downwards to avoid uneven stress.

[0038] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0040] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. The corrosion-resistant double-layer explosion-proof box is characterized by: The invention comprises an inner box body (1) made of metal material, and an outer box body (2) made of plastic material nested outside the inner box body (1), wherein the electrical component (3) is arranged inside the inner box body (1); a control knob (4) is arranged on the outer box body (2), and a control shaft (5) is connected to the control knob (4); the control shaft (5) penetrates the box wall of the outer box body (2) and the box wall of the inner box body (1) and is connected to the electrical component (3); An outer through hole is formed on the wall of the outer box body (2), an inner through hole is formed on the wall of the inner box body (1), and the control shaft (5) is passed through the outer through hole and the inner through hole; An inner bushing (6) is sleeved on the control shaft (5), an outer bushing (7) is sleeved outside the inner bushing (6), and the outer bushing (7) is respectively interference-fitted with the outer through hole and the inner through hole; an outer sealing ring (8) is arranged on the outer end surfaces of the outer bushing (7) and the inner bushing (6), and the outer sealing ring (8) covers the gap between the outer bushing (7) and the inner bushing (6); a clamping ring (10) is arranged on the outer side of the outer sealing ring (8), and the control knob (4) is pressed on the outer end of the clamping ring (10), and the inner end of the clamping ring (10) presses against the outer sealing ring (8).

2. The corrosion-resistant double-layer explosion-proof box according to claim 1 is characterized in that: Inner sealing rings (9) are also provided at the inner ends of the outer bushing (7) and the inner bushing (6), and the inner sealing ring (9) covers the gap between the outer bushing (7) and the inner bushing (6).

3. The corrosion-resistant double-layer explosion-proof box according to claim 2 is characterized in that: The inner through hole of the inner box body (1) is provided with a support structure, and the inner sealing ring (9) is pressed on the support structure to support the inner bushing (6) and the outer bushing (7).

4. The corrosion-resistant double-layer explosion-proof box according to claim 2 is characterized in that: The inner sealing ring (9) and the outer sealing ring (8) are made of plastic.

5. The corrosion-resistant double-layer explosion-proof box according to claim 1 is characterized in that: The control knob (4) is mounted on the outer box (2) by means of bolts, with a gap being left between the bottom of the control knob (4) and the outer box (2); the outer end of the clamping ring (10) extends out of the outer box (2) and contacts the bottom of the control knob (4), and the control knob (4) presses the clamping ring (10) downward.

6. The corrosion-resistant double-layer explosion-proof box according to claim 5, characterized in that: The outer end of the clamping ring (10) is provided with a flange extending outward, and a gap is reserved between the flange of the clamping ring (10) and the box wall of the outer box body (2).

7. The corrosion-resistant double-layer explosion-proof box according to claim 6, characterized in that: A plastic sleeve (11) is provided between the clamping ring (10) and the outer through hole.

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