Positive-pressure moisture-proof pressure detection device for explosion-proof cavity of coal mining machine

Abstract

The utility model relates to a positive pressure moisture-proof pressure detection device for an explosion-proof cavity of a coal mining machine, which is arranged in an electric control cavity of underground electrical equipment and comprises a U-shaped display pipeline, a connecting pipeline and an air pressure box, an electric control box gauge outfit is arranged in the electric control cavity, and the U-shaped display pipeline is arranged on the front side wall of the electric control box gauge outfit. A dial gauge extending vertically is arranged on the front side wall of the electric cabinet gauge head, gauge head through holes formed in the front side wall of the electric cabinet gauge head are formed in the top of the dial gauge, the two ends of the upper portion of the U-shaped display pipeline penetrate through the gauge head through holes to extend into the rear side of the front side wall of the electric cabinet gauge head respectively, and an air pressure box is arranged on one side of the electric cabinet gauge head. The air pressure box is in the shape of a cone with a flat top, the air pressure box is connected with one end of the U-shaped display pipeline through the connecting pipeline, and in a word, the device has the advantages that the structure is simple, operation is convenient, space is saved, extra power supply is not needed, the device is not affected by dry ice, and maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of underground electrical equipment technology, specifically relating to a positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine. Background Technology

[0002] The operating environment of underground electrical equipment is humid and harsh, and equipment failure or damage often occurs due to moisture or water ingress into the electrical control chamber, greatly increasing the failure rate. Statistics show that more than 70% of underground electrical failures are caused by moisture or water ingress. How to prevent moisture in electrical equipment is the key to reducing the failure rate. Analysis of the causes of moisture in electrical equipment reveals that during operation, the internal cavity of the electrical equipment heats up, and the gas expands. When the cavity is not airtight, the gas will escape outward. When the equipment cools down, the cavity pressure drops, and external humid air is drawn in. Over time, this leads to moisture ingress into the electrical components. Structural analysis shows that underground electrical equipment chambers have good airtightness. The main causes of moisture ingress are poor airtightness due to the drying of the explosion-proof protective oil and the aging of seals, leading to water ingress. However, there is currently no device that utilizes the good airtightness of underground electrical equipment to test its moisture-proof performance.

[0003] The utility model patent with application number CN201721416491.3 discloses a micro-positive pressure moisture-proof system for switchgear, including a pressure detector installed inside the switchgear, an air inlet pipe connected to the switchgear, and an air dryer, an air filter, and an air booster sequentially installed on the air inlet pipe. The air dryer is used to perform condensation dehumidification and drying on the air entering it, the air filter is used to filter the dried air to remove impurities, and the air booster is used to pressurize the air after impurity removal and deliver it to the switchgear through the air inlet pipe. A solenoid valve is installed at one end of the air inlet pipe connected to the switchgear. The pressure detector, solenoid valve, and air booster are all connected to a controller. However, the pressure detection device, solenoid valve, and air booster require additional power supply, which not only increases energy consumption but also requires an additional controller for electrical control. This is not only inconvenient to replace but also prone to electrical spark failure, increasing the risk of accidents in underground coal mining spaces. At the same time, it is also prone to detection errors in environments with a large amount of dry ice gas.

[0004] Therefore, there is an urgent need for a positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine to solve the problems mentioned above, such as complex structure, increased cost, need for power supply, unsuitability for underground environment, insensitivity to ambient gas, and occupation of extra space. Utility Model Content

[0005] In view of this, this utility model proposes a positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine, which belongs to the field of underground electrical equipment technology and solves the technical problems of complex structure, increased cost, need for power supply, unsuitability for underground environment and occupation of extra space.

[0006] To achieve the above-mentioned technical objectives, the specific technical solution adopted by this utility model is as follows:

[0007] A positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine is installed inside the electrical control cavity of underground electrical equipment. It includes a U-shaped display pipe, a connecting pipe, and a pressure box. An electrical control box is installed inside the electrical control cavity. The U-shaped display pipe is located on the front wall of the electrical control box, and a vertically extending scale is installed on the front wall of the electrical control box. The scale is located within the surrounding area of ​​the U-shaped display pipe. The lower part of the U-shaped display pipe bends around the scale. The top of the scale has a through hole in the front wall of the electrical control box. The upper two ends of the U-shaped display pipe pass through the through hole and extend to the rear side of the front wall of the electrical control box. A pressure box is installed on one side of the electrical control box. The pressure box is shaped like a flattened cone. The pressure box is connected to one end of the U-shaped display pipe via the connecting pipe. The end of the U-shaped display pipe furthest from the pressure box is vertically exposed to the air inside the electrical control cavity.

[0008] Furthermore, an observation window is provided on the electrical control chamber, and the instrument head of the electrical control box is positioned horizontally directly opposite the observation window, so as to observe the position of the liquid inside the U-shaped display pipe within the scale through the observation window.

[0009] Furthermore, the connection between the pressure box and the connecting pipe is coated with epoxy resin, and the outer end of the pressure box is equipped with a sealing cap that can be rotated open.

[0010] Furthermore, the air pressure box is fixed inside the electrical control cavity on the inner wall of the meter head of the electrical control box, and the connecting pipe is fixed to the inner wall of the meter head of the electrical control box with tape.

[0011] Furthermore, a connector is provided in the middle of the connecting pipe. The connector is shaped like the needle of an infusion tube. The part of the connecting pipe that connects to the pressure box is inserted into the part of the connecting pipe that connects to the U-shaped display pipe through the connector.

[0012] Furthermore, the control box is equipped with a display screen. The U-shaped display tube located on the front side wall of the control box and the scale are located on one side of the display screen and extend parallel to the vertical edge of the display screen.

[0013] Furthermore, the graduations on the scale are distributed in a direction that increases sequentially from bottom to top.

[0014] The working principle of this utility model is as follows: dry gas is filled into the electrical control cavity. When the electrical equipment has good sealing performance, the internal pressure of the cavity will be higher than the external pressure. When the sealing performance decreases, the gas pressure will drop. By detecting the change in gas pressure, the airtightness of the electrical control cavity can be detected, thereby indirectly detecting the moisture-proof performance of the equipment. The high-pressure gas inside the cavity can actively prevent the entry of external humid air.

[0015] By adopting the above technical solution, this utility model can also bring the following beneficial effects:

[0016] This invention utilizes a positive pressure moisture-proof method, which can actively protect equipment and better monitor its status. It can significantly reduce the risk of moisture damage to explosion-proof equipment, and is low in cost, simple in structure and easy to manufacture, requires little installation space, and has clear and easy-to-observe scales. It can be modified and applied to equipment with observation windows, and the pressure observation method allows for very intuitive observation, which can greatly improve the efficiency of equipment maintenance and better promote the achievement of the goal of reducing manpower and increasing efficiency. It is very suitable for large-scale promotion. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This utility model provides a structural schematic diagram of a positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine;

[0019] Figure 2 This is a schematic diagram of the connection structure between the air pressure box and the sealing cover in this utility model;

[0020] The components include: 1. U-shaped display pipe; 2. connecting pipe; 3. air pressure box; 4. electrical control box meter head; 5. scale; 6. meter head through hole; 7. sealing cover; 8. connector; 9. display screen. Detailed Implementation

[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0024] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0026] In one embodiment of this utility model, such as Figure 1 and Figure 2The device shown is a positive pressure and moisture-proof pressure detection device for the explosion-proof cavity of a coal mining machine. It is installed inside the electrical control cavity of underground electrical equipment and includes a U-shaped display pipe 1, a connecting pipe 2, and a pressure box 3. An electrical control box meter 4 is installed inside the electrical control cavity. The U-shaped display pipe 1 is located on the front wall of the electrical control box meter 4. A vertically extending scale 5 is installed on the front wall of the electrical control box meter 4, and the scale 5 is located within the surrounding area of ​​the U-shaped display pipe 1. The lower part of the U-shaped display pipe 1 bends around the scale 5. The top of the meter 5 is provided with a meter head through hole 6 opened on the front side wall of the meter head 4 of the electrical control box. The upper two ends of the U-shaped display pipe 1 pass through the meter head through hole 6 and extend into the rear side of the front side wall of the meter head 4 of the electrical control box. A pressure box 3 is provided on one side of the meter head 4 of the electrical control box. The pressure box 3 is shaped like a flat cone with a flat top. The pressure box 3 is connected to one end of the U-shaped display pipe 1 through a connecting pipe 2. The end of the U-shaped display pipe 1 away from the pressure box 3 is vertically exposed to the air inside the electrical control cavity.

[0027] An observation window is provided on the electrical control chamber, with the control box meter 4 positioned horizontally directly opposite it, facilitating observation of the liquid level within the scale 5 inside the U-shaped display pipe 1. A display screen 9 is mounted on the control box meter 4. The portion of the U-shaped display pipe 1 located on the front wall of the control box meter 4 and the scale 5 are positioned to one side of the display screen 9, extending parallel to its vertical edge. The graduations on the scale 5 are distributed in a progressively increasing direction from bottom to top.

[0028] The connection between the pressure box 3 and the connecting pipe 2 is coated with epoxy resin for sealing and moisture protection. The outer end of the pressure box 3 is equipped with a rotatable sealing cap 7. The pressure box 3 is fixed inside the electrical control chamber on the inner wall of the meter 4 in the electrical control box. The connecting pipe 2 is fixed to the inner wall of the meter 4 in the electrical control box with tape. A connector 8 is located in the middle of the connecting pipe 2. The connector 8 is shaped like an IV needle. The portion of the connecting pipe 2 that connects to the pressure box 3 is inserted into the portion of the connecting pipe 2 that connects to the U-shaped display pipe 1 through the connector 8.

[0029] In use, this invention first treats the mating surfaces of the electrical control cavity with Vaseline. This seals the cavity and allows it to absorb heat during an explosion, while simultaneously releasing high-pressure gas for explosion protection. Dry ice is then placed inside the cavity, creating positive pressure to prevent the entry of external humid gases and diluting the internal oxygen concentration, thus reducing component aging. In the event of a short circuit or explosion within the electrical equipment, the low oxygen concentration suppresses electrical sparks, reducing the intensity of the explosion. Furthermore, the protection status of the cavity can be assessed by observing changes in gas pressure within it, making inspection more accurate and timely. In summary, this invention offers advantages such as simple structure, convenient operation, space saving, no need for external power supply, immunity to dry ice effects, and improved maintenance efficiency.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A positive pressure moisture-proof pressure detection device for a coal mining machine explosion-proof chamber, arranged in the electric control chamber of an underground electrical equipment, characterized in that: The utility model provides an electric control cavity, including U type display pipeline (1), connecting pipeline (2) and air pressure box (3), electric control chamber inside is provided with electric control box meter head (4), U type display pipeline (1) is set up on the front side wall of electric control box meter head (4), the front side wall of electric control box meter head (4) is provided with the vertical extension scale meter (5), scale meter (5) is located in the surrounding range of U type display pipeline (1), the lower part of the surrounding scale meter (5) of U type display pipeline (1) is bent, the top of scale meter (5) is provided with the meter head through -hole (6) of opening in the front side wall of electric control box meter head (4), the upper part of U type display pipeline (1) two ends respectively passes through meter head through -hole (6) and goes into the rear side of the front side wall of electric control box meter head (4), one side of electric control box meter head (4) is provided with air pressure box (3), the shape of air pressure box (3) is the top flat conical shape, air pressure box (3) is connected with one end of U type display pipeline (1) through connecting pipeline (2), and the end of U type display pipeline (1) away from air pressure box (3) is vertically exposed in the air in the inside of electric control cavity.

2. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 1, characterized in that: The electric control cavity is provided with an observation window, and the electric control box meter head (4) is horizontally opposite to the observation window, so that the liquid in the U type display pipeline (1) can be observed through the observation window.

3. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 2, characterized in that: The connecting part of the air pressure box (3) and the connecting pipeline (2) is coated with epoxy resin, and the outer end of the air pressure box (3) is provided with a sealable cover (7) that can be rotated.

4. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 3, characterized in that: The air pressure box (3) is fixed on the inner wall of the electric control cavity on the side of the electric control box meter head (4), and the connecting pipeline (2) is fixed on the inner wall of the electric control box meter head (4) by adhesive tape.

5. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 4, characterized in that: A connecting head (8) is arranged at the middle part of the connecting pipeline (2), the connecting head (8) is in the shape of a needle head of a transfusion tube, and the connecting pipeline (2) connected with the air pressure box (3) is inserted into the connecting pipeline (2) connected with the U type display pipeline (1) through the connecting head (8).

6. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 5, characterized in that: A display screen (9) is arranged on the electric control box meter head (4), and the part of the U type display pipeline (1) on the front side wall of the electric control box meter head (4) and the scale meter (5) are arranged on one side of the display screen (9) and extend parallel to the vertical edge of the display screen (9).

7. The positive pressure detection device for the explosion-proof chamber of a coal mining machine according to claim 6, characterized in that: The scales on the scale meter (5) are arranged in the direction of increasing from bottom to top.

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