Anti-explosion submersible pump

Abstract

In order to improve the compression resistance of a threading hole and prolong the service life of the threading hole, the explosion-proof submersible pump comprises a machine body, a wiring end cover located at the top of the machine body and a filtering base located at the bottom of the machine body, an explosion-proof mechanism is arranged between the machine body and the wiring end cover, and the explosion-proof mechanism comprises an explosion-proof space formed in the explosion-proof mechanism; two ends of the explosion-proof mechanism are respectively in sealing connection with the end face of the machine body and the end face of the wiring end cover; a plurality of ceramic binding posts are arranged at the top of the explosion-proof space in a penetrating manner; two terminals of each ceramic binding post are respectively positioned in the explosion-proof space and the terminal end cover; and pressure reduction structures for prolonging and reducing the pressure of the explosion inner cavity are arranged between the explosion-proof mechanism and the wiring end cover and between the explosion-proof mechanism and the machine body.

Description

Technical Field

[0001] The present application relates to the field of explosion-proof submersible pumps, and in particular to an explosion-proof submersible pump. Background Art

[0002] When performing drainage operations in flammable and explosive situations, especially for water supply and drainage in mines, traditional sewage submersible pumps face higher requirements and need to have better motor performance and safety to cope with harsh operating environments.

[0003] In the prior art, the submersible pump usually uses the top of the shell as a wiring compartment, and sets a threading hole in the compartment wall for threading the winding lead wire, which is then sealed with a sealant. Since the winding lead wire may be entangled, twisted, and adhered during the installation process, the sealant in the threading hole may be unevenly distributed, or the gap between the lead wire and the inner wall of the threading hole may not be completely covered, thereby reducing the pressure resistance and service life of the submersible pump at this location. Utility Model Content

[0004] In order to improve the pressure resistance and service life of the threading holes, the present application provides an explosion-proof submersible pump.

[0005] The explosion-proof submersible pump provided in this application adopts the following technical solution:

[0006] An explosion-proof submersible pump comprises a body, a terminal cover located at the top of the body, and a filter seat located at the bottom of the body, wherein a flameproof mechanism is arranged between the body and the terminal cover, wherein the flameproof mechanism comprises a flameproof space opened inside the body, and two ends of the flameproof mechanism are respectively sealed and connected to the end face of the body and the end face of the terminal cover;

[0007] A plurality of ceramic terminals are provided on the top of the flameproof space, and two terminals of each ceramic terminal are located in the flameproof space and the terminal cover respectively;

[0008] A pressure reducing structure for extending and reducing the pressure of the explosion cavity is provided between the explosion-proof mechanism, the terminal cover and the machine body.

[0009] Further, the pressure reduction structure includes an upper limit ring located at one end of the terminal cover facing the flameproof mechanism, an upper positioning ring is provided at one end of the flameproof mechanism facing the terminal cover, the outer peripheral surface of the upper limit ring abuts against the inner peripheral surface of the upper positioning ring, and the flameproof mechanism is further provided with an abutting ring abutting against the end of the upper limit ring facing the flameproof mechanism;

[0010] The upper limit ring is integrally formed with the terminal cover.

[0011] Furthermore, the pressure reduction structure includes a lower positioning groove opened at one end of the body facing the explosion-proof mechanism, and a lower limiting ring is provided at one end of the explosion-proof mechanism facing the body, and the lower limiting ring is embedded in the lower positioning groove, and the outer peripheral surface of the lower limiting ring abuts against the side wall of the lower positioning groove;

[0012] The lower limiting ring is in contact with the bottom of the lower positioning groove at one end facing the machine body.

[0013] Furthermore, a plurality of connection holes are provided on the top of the flameproof space, and each ceramic terminal corresponds to each connection hole one by one and is threadedly connected;

[0014] Both ends of each connecting hole are provided with connecting protrusions, and each connecting protrusion is provided with a threaded hole connected with the corresponding connecting hole.

[0015] Furthermore, the longitudinal section of the sealing surface between the upper positioning ring and the terminal cover, and the longitudinal section of the sealing surface between the end surface of the flameproof mechanism and the body are both wavy structures.

[0016] Furthermore, the filter seat includes a connecting ring for connecting to the body, a base for supporting the body and a plurality of filter levers;

[0017] A thread groove is formed at one end of the base facing the connecting ring, one end of each filter lever is fixedly connected to the connecting ring or integrally formed, and the other end of each filter lever is threadedly connected to the side wall of the thread groove.

[0018] Furthermore, the cross section of the filter lever is a trapezoidal structure.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] The utility model can solve the problems of uneven sealant distribution or failure to completely cover the gap between the lead and the inner wall of the threading hole caused by winding, twisting, adhesion, etc. of the winding lead, and can make the motor explode without spreading outward, thereby improving the pressure resistance and service life of the internal circuit of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of embodiment 1;

[0022] Figure 2 is a cross-sectional view of embodiment 1;

[0023] Figure 3 It is a partial schematic diagram of the first embodiment;

[0024] Figure 4 It is a partial schematic diagram of the second embodiment;

[0025] Figure 5 for Figure 2 A in the enlarged view;

[0026] Figure 6 for Figure 2 Enlarged view of point B in .

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Machine body; 11. Lower positioning groove; 2. Terminal cover; 21. Upper limiting ring; 3. Filter seat; 31. Connecting ring; 32. Filter lever; 33. Base; 34. Threaded groove; 4. Explosion-proof mechanism; 41. Explosion-proof space; 42. Upper positioning ring; 43. Abutment ring; 44. Lower limiting ring; 45. Connecting hole; 46. Connecting protrusion; 5. Ceramic terminal. DETAILED DESCRIPTION

[0028] Embodiment 1 The following is combined with the attached Figure 1-3 , 5, and 6 further describe this application in detail.

[0029] The embodiment of the present application discloses an explosion-proof submersible pump, the main structure of which includes a body 1, a terminal cover 2 located at the top of the body 1, and a filter seat 3 located at the bottom of the body 1. The body 1 is equipped with submersible pump related parts such as a motor. In this embodiment, a flameproof mechanism 4 is arranged between the body 1 and the terminal cover 2, and a flameproof space 41 is provided inside the flameproof mechanism 4. The two ends of the flameproof mechanism 4 are respectively sealed and connected to the end face of the body 1 and the end face of the terminal cover 2, so that the motor will not spread outward when it explodes.

[0030] Specifically, in this embodiment, a plurality of ceramic terminals 5 are provided on the top of the flameproof space 41. The number of ceramic terminals 5 matches the number of leads of the submersible pump motor, which is usually 3, and the two terminals of each ceramic terminal 5 are respectively located in the flameproof space 41 and the terminal cover 2. Each ceramic terminal 5 is connected to a lead wire, which extends from the inside of the body 1 into the flameproof space 41 and is electrically connected to the terminal of the ceramic terminal 5. The other terminal of the ceramic terminal 5 is located in the terminal cover 2 and is electrically connected to the external lead wire.

[0031] The specific installation method of the ceramic terminal 5 is to fix it through a number of connection holes 45 opened at the top of the flameproof space 41. Each ceramic terminal 5 includes an insulating ceramic ring, which is fixed by corresponding the insulating ceramic ring to each connection hole 45 one by one and threadedly connected. In order to increase the contact area between the ceramic terminal 5 and the connection hole 45, the present embodiment adds a connection protrusion 46 at both ends of each connection hole 45 (compared with directly thickening the top of the flameproof space 41, space can be reserved to accommodate the wiring space in the external lead and the terminal cover 2), and each connection protrusion 46 is provided with a threaded hole connected to the corresponding connection hole 45. The insulating ceramic ring is threadedly connected to the inner wall of the threaded hole and the threaded hole of the connecting protrusion 46 at the same time. By increasing the area of ​​the threaded connection of the insulating ceramic ring, the gap between the flameproof space 41 and the inner cavity of the terminal cover 2 is lengthened. If sparks or high-pressure gas are generated in the flameproof space 41 or the inner cavity of the terminal cover 2, it is difficult to pass through the gap at the threaded connection of the insulating ceramic ring, thereby improving the flameproof performance of the present embodiment.

[0032] The external lead wire can be inserted through the wiring hole of the terminal cover 2, and explosion-proof glue or other high temperature resistant, corrosion resistant, waterproof and dustproof glue is poured into the wiring hole to ensure the sealing and safety of the wiring hole. Specifically, epoxy resin glue, silicone rubber glue, polyurethane glue, polyacrylic acid glue, etc. can be used, which is not limited in this embodiment. The ceramic terminal 5 is resistant to high temperature, has good insulation, corrosion resistance, and stable performance. The lead wire of the submersible pump motor is separated from the external lead wire. The two terminal ends of the ceramic terminal 5 are respectively in two independent explosion-proof areas, which improves the safety of this embodiment.

[0033] In addition, in terms of the connection method of the flameproof mechanism 4, this embodiment also provides a pressure reducing structure for extending and reducing the pressure of the explosion cavity between the flameproof mechanism 4 and the terminal cover 2 and the body 1.

[0034] Specifically, the pressure reduction structure includes two parts, one part includes an upper limit ring 21 located at one end of the terminal cover 2 facing the flameproof mechanism 4, and an upper positioning ring 42 is provided at one end of the flameproof mechanism 4 facing the terminal cover 2, and the outer peripheral surface of the upper limit ring 21 abuts against the inner peripheral surface of the upper positioning ring 42 (the outer peripheral surface of the upper limit ring 21 and the inner peripheral surface of the upper positioning ring 42 are preferably non-rotating body shapes, such as polygons, which can play a fool-proof role during the assembly process, facilitate assembly positioning, and improve assembly efficiency). At the same time, the flameproof mechanism 4 is also provided with an abutment ring 43 abutting against the end of the upper limit ring 21 facing the flameproof mechanism 4. Through the cooperation of the upper positioning ring 42, the upper limit ring 21 and the abutment ring 43, if an explosion occurs in the terminal cover 2, the gas pressure needs to pass through the abutment ring 43, the inner wall of the upper positioning ring 42, the terminal cover 2 and the end face of the explosion-proof mechanism 4 in sequence to diffuse to the outside. This sufficiently narrow gap will cool the sparks leaking from the inner cavity of the terminal cover 2 and the high-temperature gas after the explosion to a safe temperature, thereby achieving the purpose of "explosion-proof".

[0035] In order to improve the structural strength of the upper limit ring 21 , the upper limit ring 21 and the terminal cover 2 can be formed in one piece.

[0036] Similarly, another part of the pressure reduction structure in this embodiment includes a lower positioning groove 11 opened at one end of the body 1 facing the flameproof mechanism 4, and a lower limiting ring 44 is provided at one end of the flameproof mechanism 4 facing the body 1 (the longitudinal section is preferably an inverted right-angle trapezoidal structure, and the lower limiting ring 44 is inclined on the inner side, which is convenient for embedding itself into the lower positioning groove 11 and facilitating assembly). The lower limiting ring 44 is embedded in the lower positioning groove 11, and the outer peripheral surface of the lower limiting ring 44 abuts against the side wall of the lower positioning groove 11 (the outer peripheral surface of the lower positioning groove 11 and the inner peripheral surface of the lower limiting ring 44 are also preferably non-rotating body shapes, such as polygons, which can play a fool-proof role in the assembly process, facilitate assembly positioning, and improve assembly efficiency). At the same time, the lower limiting ring 44 is abutted against the bottom of the lower positioning groove 11 at one end facing the body 1. If an explosion occurs in the explosion-proof space 41, the gas pressure needs to pass through the bottom of the lower positioning groove 11, the side wall of the lower positioning groove 11, the sealing surface of the body 1 and the explosion-proof mechanism 4 in sequence to diffuse to the outside world. Through a sufficiently narrow and long gap, the sparks in the explosion-proof space 41 and the high-temperature gas after the explosion are cooled to a safe temperature, thereby achieving the purpose of "explosion-proof".

[0037] In order to further extend the gap for cooling and reducing pressure, in this embodiment, the longitudinal section of the sealing surface between the upper positioning ring 42 and the terminal cover 2, and the longitudinal section of the sealing surface between the end face of the flameproof mechanism 4 and the body 1 are designed to be a wave-like structure. At the same time, sealing structures such as seals can be embedded there to improve the sealing and explosion-proof performance. The terminal cover 2 and the flameproof mechanism 4, as well as the flameproof mechanism 4 and the body 1 can be connected by bolts for easy loading and unloading.

[0038] Since the width of the sealing surface between the upper positioning ring 42 and the terminal cover 2, and the width of the sealing surface between the end face of the explosion-proof mechanism 4 and the body 1 are affected by the specifications of the submersible pump, and installation space must be reserved for the bolts, the present embodiment does not limit the width and amplitude of the wavy structure, and may be provided in only one section, or may be provided on both sides of the bolt, which will not be described in detail in this embodiment.

[0039] Embodiment 2

[0040] like Figure 1 and Figure 4As shown, in some applications, there are a lot of strips of garbage or debris, which flow in an undirected manner under the influence of the water flow, and then entangle on the filter seat 3, making it difficult to remove. Therefore, based on the above-mentioned implementation, the filter seat 3 is improved in this embodiment to facilitate the staff to clean the filtered objects entangled on the filter seat 3. Specifically, the filter seat 3 in this embodiment includes a connecting ring 31 for connecting the body 1, a base 33 for supporting the body 1, and a plurality of filter levers 32. The connecting ring 31 is detachably fixedly connected to the bottom of the body 1 by fasteners, such as bolts, which is easy to replace and suitable for filtering requirements in different occasions.

[0041] The base 33 is provided with a thread groove 34 at one end facing the connecting ring 31, and a thread is set on the side wall of the thread groove 34. Then one end of each filter lever 32 is fixedly connected or integrally formed with the connecting ring 31 to ensure the fixation of the position and angle of each filter lever 32 and the structural strength. Then the outer side of the other end of each filter lever 32 is threadedly connected to the side wall of the thread groove 34, and the bottom of the filter lever 32 is abutted against the bottom of the thread groove 34. Through such a design, on the one hand, by increasing the number of filter levers 32 and reducing the spacing between each filter baffle, it can play a role in preventing debris from entering the body 1, and on the other hand, it can ensure the support of the body 1. When long strips of debris, such as cloth, rubber, and plastic, are wound around the filter levers 32 and are difficult to cut or remove, the base 33 can be unscrewed to make the downward end of the filter lever 32 a free end, so that the staff can remove the debris wound around the filter lever 32, thereby improving the convenience for the staff to clean the filter seat 3 and facilitating the maintenance and replacement of the worn base 33, thereby reducing the cost compared to replacing the entire filter seat 3.

[0042] In order to improve the support strength of the filter lever 32 and prevent the debris wrapped around the filter lever 32 under the influence of the water flow from being too tight, the cross section of the filter lever 32 is designed to be a trapezoidal structure in this embodiment, which improves the stability of the filter seat 3 and does not affect the removal of the wrapped debris.

[0043] Embodiment 3

[0044] like Figure 1-3 As shown, on the basis of the above-mentioned embodiment, the sealing part between the terminal cover 2 and the flameproof mechanism 4, the flameproof mechanism 4 and the body 1, and each abutting surface in the pressure reduction structure can also achieve a hard sealing effect by improving the processing accuracy. It is further improved that when an explosion occurs in the terminal cover 2 or the flameproof space 41, the difficulty of sparks and high-temperature gases leaking out is improved, thereby improving the safety and reliability of this embodiment.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An explosion-proof submersible pump, comprising a body (1), a terminal cover (2) located at the top of the body (1), and a filter seat (3) located at the bottom of the body (1), characterized in that: A flameproof mechanism (4) is provided between the machine body (1) and the terminal cover (2), the flameproof mechanism (4) comprising a flameproof space (41) opened inside the flameproof mechanism (4), and two ends of the flameproof mechanism (4) are respectively sealedly connected to the end face of the machine body (1) and the end face of the terminal cover (2); A plurality of ceramic terminals (5) are provided on the top of the flameproof space (41), and two terminals of each ceramic terminal (5) are respectively located in the flameproof space (41) and the terminal cover (2); A pressure reducing structure for extending and reducing the pressure of the explosion cavity is provided between the explosion-proof mechanism (4), the terminal cover (2) and the machine body (1).

2. An explosion-proof submersible pump according to claim 1, characterized in that: The pressure reduction structure comprises an upper limit ring (21) located at one end of the terminal cover (2) facing the flameproof mechanism (4); an upper positioning ring (42) is provided at one end of the flameproof mechanism (4) facing the terminal cover (2); an outer peripheral surface of the upper limit ring (21) abuts against an inner peripheral surface of the upper positioning ring (42); and the flameproof mechanism (4) is further provided with an abutting ring (43) abutting against one end of the upper limit ring (21) facing the flameproof mechanism (4); The upper limit ring (21) and the terminal cover (2) are integrally formed.

3. An explosion-proof submersible pump according to claim 2, characterized in that: The pressure reduction structure comprises a lower positioning groove (11) provided at one end of the machine body (1) facing the flameproof mechanism (4); a lower limiting ring (44) is provided at one end of the flameproof mechanism (4) facing the machine body (1); the lower limiting ring (44) is embedded in the lower positioning groove (11), and the outer peripheral surface of the lower limiting ring (44) abuts against the side wall of the lower positioning groove (11); One end of the lower limiting ring (44) facing the machine body (1) abuts against the bottom of the lower positioning groove (11).

4. An explosion-proof submersible pump according to claim 1, 2 or 3, characterized in that: The top of the flameproof space (41) is provided with a plurality of connection holes (45), and each ceramic terminal (5) corresponds to each connection hole (45) one by one and is threadedly connected; Both ends of each connection hole (45) are provided with connection protrusions (46), and each connection protrusion (46) is provided with a threaded hole connected to the corresponding connection hole (45).

5. An explosion-proof submersible pump according to claim 2, characterized in that: The longitudinal sections of the sealing surfaces of the upper positioning ring (42) and the terminal cover (2), and the longitudinal sections of the sealing surfaces of the end surface of the flameproof mechanism (4) and the body (1) are all wavy structures.

6. An explosion-proof submersible pump according to claim 1, 2 or 3, characterized in that: The filter seat (3) comprises a connecting ring (31) for connecting to the body (1), a base (33) for supporting the body (1), and a plurality of filter levers (32); a thread groove (34) is provided at one end of the base (33) facing the connecting ring (31); one end of each filter lever (32) is fixedly connected to the connecting ring (31) or integrally formed; and the other end of each filter lever (32) is threadedly connected to the side wall of the thread groove (34).

7. An explosion-proof submersible pump according to claim 6, characterized in that: The cross section of the filter lever (32) is a trapezoidal structure.

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