Bowl-shaped frequency conversion device for submersible pump

Abstract

The utility model provides a bowl-shaped frequency conversion device for a submersible pump, and belongs to the technical field of water pumps. The technical problem that an existing water pump built-in frequency conversion device is not easy to fix and seal is solved. According to the bowl-shaped frequency conversion device for the submersible pump, the submersible pump comprises a cylindrical motor shell, the frequency conversion device comprises an outer shell and a frequency conversion module arranged in the outer shell, and the outer shell comprises a bowl-shaped lower shell with a containing cavity and an upper cover for sealing and fixing the bowl-shaped lower shell; a plane bottom wall used for fixedly installing the frequency conversion module and an arc side wall used for being in tight press fit with the cylindrical motor shell are integrally formed on the bowl-type lower shell, an installation plane block protrudes inwards from the plane bottom wall, a plurality of threaded blind holes are formed in the installation plane block, the frequency conversion module is fixed to the threaded blind holes through first fixing pieces in a threaded mode, and the arc side wall is used for being in tight press fit with the cylindrical motor shell. The containing cavity is filled with cooling oil. According to the utility model, the frequency conversion device is sealed and fixed in the motor, and the heat radiation effect can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps, in particular to a bowl-shaped frequency conversion device for a submersible pump. Background Art

[0002] The biggest feature of the submersible pump is that it is a pump that is immersed in a groundwater well to suck and transport water. It is widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and sewage treatment. As the groundwater level continues to drop, the diving depth of the deep well pump is getting deeper and deeper, the water pressure on the motor is getting greater and greater, and the working environment is becoming more and more harsh.

[0003] Submersible pumps generally include a pump assembly and a motor that drives the pump assembly. Since it needs to work underwater, the motor here is a submersible motor. In the prior art, the submersible motor also includes a frequency converter, which is used to control the motor with frequency conversion. In the prior art, the frequency converter is set in the motor, but the frequency converter needs to be sealed with epoxy glue. However, when the water pump is running, the frequency converter heats up and causes the epoxy glue to expand, causing the components to be damaged and fail, shortening the life of the frequency converter, and causing serious direct damage. The frequency converter sealed with epoxy glue is directly installed in the inner cavity of the motor. The frequency converter heats up and causes the epoxy glue to expand. When the water pump is normally filled with water, moisture will enter the frequency converter, causing leakage. In severe cases, it will directly cause damage to the frequency converter and is not easy to repair. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a bowl-shaped frequency conversion device for a submersible pump. The technical problem to be solved by the utility model is: how to seal and fix the frequency conversion device in the motor and improve the heat dissipation effect.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a bowl-shaped frequency conversion device for a submersible pump, the submersible motor includes a cylindrical motor shell, the frequency conversion device includes a shell and a frequency conversion module arranged in the shell, the shell includes a bowl-shaped lower shell with a accommodating cavity and an upper cover that seals and fixes the bowl-shaped lower shell, the bowl-shaped lower shell is integrally formed with a flat bottom wall for fixing and installing the frequency conversion module and an arc side wall for tightly press-fitting with the cylindrical motor shell, the flat bottom wall protrudes inwardly with a mounting plane block, the mounting plane block has a plurality of threaded blind holes, the frequency conversion module is threadedly fixed to the threaded blind hole through a fixing member, and the accommodating cavity is filled with cooling oil.

[0006] The shell of the frequency converter is sealed by a bowl-shaped lower shell and an upper shell to form a receiving chamber, and the receiving chamber is filled with cooling oil. The bowl-shaped lower shell has a flat bottom wall and an arc side wall. The flat bottom wall protrudes inward with a mounting plane block. The frequency converter module is horizontally arranged on the mounting plane block and fixed. The fixed threaded hole is a threaded blind hole that does not penetrate the flat bottom wall, which can form a good seal to prevent water from leaking into the receiving chamber, and the receiving chamber is filled with cooling oil to form a closed working state. The arc side wall and the cylindrical motor shell are tightly pressed and fixed to fix the entire frequency converter. The frequency converter is sealed internally and can be fixed to the cylindrical motor shell externally, forming a well-sealed and heat-conductive frequency converter.

[0007] Furthermore, the plane bottom wall has a plurality of round bosses protruding outwards, and the round bosses correspond to the threaded blind holes one by one. The frequency conversion module includes a fixedly connected power tube and a frequency conversion control board. The power tube abuts against the mounting plane block. The frequency conversion control board has a mounting hole corresponding to the threaded blind hole. After the fixing piece passes through the mounting hole, it abuts against the power tube and is screwed and fixed with the threaded blind hole. The power tube is the main heating element in the frequency conversion module. The power tube is fixed to the mounting plane block, and the heat is conducted out through the mounting plane block and the cooling oil.

[0008] Furthermore, the plane bottom wall protrudes outward with a plurality of evenly arranged heat dissipation plates, and a heat dissipation channel is formed between two adjacent heat dissipation plates. The heat dissipation channel can better dissipate the heat of the power tube.

[0009] Furthermore, the bowl-shaped lower shell also has two symmetrically arranged flat side walls, the two flat side walls are connected to the two arc side walls in sequence, the flat side wall protrudes outwardly with a mounting truncated platform 1, the mounting truncated platform 1 is provided with a fixing hole 1, the arc side wall protrudes inwardly with a mounting truncated platform 2, the mounting truncated platform 2 is provided with a fixing hole 2, a sealing member is provided between the upper cover and the bowl-shaped lower shell, the upper cover is provided with a fixing hole 3 corresponding to the fixing hole 1, and a fixing hole 4 corresponding to the fixing hole 2, the fastener 2 passes through the fixing hole 3 and is screwed and fixed to the fixing hole 1, and the fastener 3 passes through the fixing hole 4 and is screwed and fixed to the fixing hole 2. This solution makes the sealing effect of the upper shell and the bowl-shaped lower shell better.

[0010] Furthermore, the upper cover has a sealing boss protruding inwardly, the sealing member is sleeved outside the sealing boss, and the sealing member has a through hole 1 corresponding to the fixing hole 1 and a through hole 2 corresponding to the fixing hole 2.

[0011] Furthermore, the mounting truncated platform 1 is located in the middle of the flat plate side wall and the outer peripheral surface of the mounting truncated platform 1 abuts against the inner wall of the motor housing, so that the frequency conversion device can be better fixed.

[0012] Furthermore, the mounting truncated platform 1 and the flat plate side wall are connected with an L-shaped reinforcing plate, and the outer peripheral surface of the reinforcing plate abuts against the inner wall of the motor housing, so as to better fix the frequency conversion device.

[0013] Furthermore, the upper cover has an oil filling hole, which is a stepped threaded hole, and the fastening bolt passes through the sealing gasket and is fixed with the thread of the oil filling hole. Cooling oil is poured into the oil filling hole, and then fastened and sealed by the fastening bolt and the sealing gasket to prevent water and oil leakage.

[0014] Furthermore, the upper cover protrudes outwardly with a wire mounting platform, the wire mounting platform is provided with a concave hole, a sealing rubber sheath is embedded in the concave hole, the wire mounting platform is provided with a wire through hole, a wire passes through the wire through hole, and the wire passes through the sealing rubber sheath, a pressing plate is provided outside the sealing rubber sheath, and the pressing plate is fixed on the wire mounting platform. To prevent leakage of the wire through hole, the sealing rubber sheath is used for better sealing.

[0015] Compared with the prior art, the technical effect of the utility model is as follows: the outer shell of the frequency converter is sealed by a bowl-shaped lower shell and an upper shell to form a accommodating cavity, the bowl-shaped lower shell has a flat bottom wall and an arc side wall, the frequency converter module is transversely arranged on the flat bottom wall and fixed, and then the accommodating cavity is filled with cooling oil to form a closed working state, and then the arc side wall and the cylindrical motor shell are tightly pressed and fitted to fix the entire frequency converter, the frequency converter is sealed internally and can be fixed to the cylindrical motor shell externally, and the heat dissipation performance of the frequency converter is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the cylindrical motor housing and the bowl-shaped lower housing of the utility model.

[0017] Figure 2 The utility model is a three-dimensional Figure 1 .

[0018] Figure 3 The utility model is a three-dimensional Figure 2 .

[0019] Figure 4 It is a three-dimensional diagram of the upper cover of the utility model.

[0020] Figure 5 This utility model is a cross-sectional view Figure 2 .

[0021] Figure 6 It is an exploded view of the utility model.

[0022] Figure number marking: 1. Cylindrical motor housing; 2. Bowl-shaped lower housing; 21. Flat bottom wall; 211. Installing plane block; 212. Threaded blind hole; 213. Round boss; 214. Heat dissipation channel; 215. Heat dissipation plate; 22. Arc side wall; 221. Installing round table 2; 222. Fixing hole 2; 23. Flat side wall; 231. Installing round table 1; 232. Fixing hole 1; 233. Reinforcement plate; 3. Upper cover; 301. Fixing Hole three; 302, fixing hole four; 303, oil filling hole; 31, sealing boss; 32, outlet mounting platform; 321, recessed hole; 322, outlet through hole; 4, fixing part one; 5, power tube; 6, frequency conversion control board; 601, mounting hole; 7, sealing part; 701, through hole one; 702, through hole two; 8, fastening bolt; 9, sealing rubber sheath; 10, wire; 11, pressure plate; 12, sealing gasket; 13, cooling oil. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] according to Figures 1 to 6 As shown: a bowl-shaped frequency conversion device for a submersible pump, the submersible pump includes a motor, the motor drives the impeller of the submersible pump to rotate, the motor includes a cylindrical motor shell 1, the frequency conversion device is installed in the cylindrical motor shell 1, and the frequency conversion device includes a shell and a frequency conversion module arranged in the shell. The shell of the frequency conversion device is composed of a bowl-shaped lower shell 2 and an upper shell sealed and fixed, the bowl-shaped lower shell 2 and the upper shell are sealed together to form a receiving cavity, and the receiving cavity is mainly located in the bowl-shaped lower shell 2. The bowl-shaped lower shell 2 is integrally formed with a plane bottom wall 21 for fixing and installing the frequency conversion module and an arc side wall 22 for tightly press-fitting with the cylindrical motor shell 1. The frequency conversion module is transversely arranged on the plane bottom wall 21 and fixed, and then the cooling oil 13 is filled in the receiving cavity to form a closed working state, and then the arc side wall 22 is tightly press-fitted with the cylindrical motor shell 1 to fix the entire frequency conversion device, and the frequency conversion device is sealed inside and can be fixed to the cylindrical motor shell 1 outside.

[0025] The plane bottom wall 21 protrudes inwardly with a mounting plane block 211, and the mounting plane block 211 has a plurality of threaded blind holes 212. The plane bottom wall 21 protrudes outwardly with a plurality of round bosses 213, and the round bosses 213 correspond to the threaded blind holes 212. The frequency conversion module includes a fixedly connected power tube 5 and a frequency conversion control board 6. The power tube 5 abuts against the mounting plane block 211, and the frequency conversion control board 6 has a mounting hole 601 corresponding to the threaded blind hole 212. The fixing member 4 passes through the mounting hole 601 and is screwed and fixed to the threaded blind hole 212. The plane bottom wall 21 protrudes outwardly with a plurality of evenly arranged heat dissipation plates 215, and a heat dissipation channel 214 is formed between two adjacent heat dissipation plates 215. The power tube 5 is the main heating element in the frequency conversion module. The power tube 5 is fitted and fixed to the mounting plane block 211, and the heat is conducted out through the mounting plane block 211 and the cooling oil 13. The heat dissipation channel 214 can better dissipate the heat of the power tube 5.

[0026] The bowl-shaped lower shell 2 also has two symmetrically arranged flat side walls 23, which are connected to the two arc side walls 22 in sequence. The flat side wall 23 has a mounting platform 231 protruding outward, and the mounting platform 231 is provided with a fixing hole 232. The arc side wall 22 has a mounting platform 221 protruding inward, and the mounting platform 221 is provided with a fixing hole 222. A sealing member 7 is provided between the upper cover 3 and the bowl-shaped lower shell 2. The upper cover 3 is provided with a fixing hole 301 corresponding to the fixing hole 1 232 and a fixing hole 4 302 corresponding to the fixing hole 222. The fastener 2 passes through the fixing hole 301 and is screwed and fixed to the fixing hole 1 232. The fastener 3 passes through the fixing hole 4 302 and is screwed and fixed to the fixing hole 222. The upper cover has a sealing boss 31 protruding inward, and the sealing member 7 is sleeved outside the sealing boss 31. The sealing member 7 has a through hole 1 701 corresponding to the fixing hole 1 232 and a through hole 2 702 corresponding to the fixing hole 222. The mounting truncated platform 1 231 is located in the middle of the flat side wall 23, and the outer circumference of the mounting truncated platform 1 231 abuts against the inner wall of the motor housing. The mounting truncated platform 1 231 and the flat side wall 23 are connected by an L-shaped reinforcing plate 233, and the outer circumference of the reinforcing plate 233 abuts against the inner wall of the motor housing.

[0027] The upper cover 3 has an oil filling hole 303, which is a stepped threaded hole. The fastening bolt 8 passes through the sealing gasket 12 and is threadedly fixed to the oil filling hole 303. The cooling oil 13 is poured in from the oil filling hole 303, and then the fastening bolt 8 and the sealing gasket 12 are used to tighten and seal to prevent water and oil leakage.

[0028] The upper cover 3 protrudes outwardly with a wire mounting platform 32, which is provided with a concave hole 321, in which a sealing rubber sheath 9 is embedded, and the wire mounting platform 32 is provided with a wire through hole 322, through which a wire 10 passes, and the wire 10 passes through the sealing rubber sheath 9, and a pressing plate 11 is provided outside the sealing rubber sheath 9, and the pressing plate 11 is fixed on the wire mounting platform 32. To prevent leakage of the wire through hole 322, the sealing rubber sheath 9 is used for better sealing.

[0029] The installation steps are to firstly place the frequency conversion module horizontally on the plane bottom wall 21 and fix it, then seal and fix the upper cover 3 and the bowl-shaped lower shell 2, inject cooling oil 13 through the oil filling hole 303 to fill the entire accommodating cavity, and then install the frequency conversion device as a whole into the cylindrical motor shell 1.

[0030] The outer shell of the frequency converter is sealed by a bowl-shaped lower shell 2 and an upper shell to form a accommodating cavity. The bowl-shaped lower shell 2 has a flat bottom wall 21 and an arc side wall 22. The frequency converter module is transversely arranged on the flat bottom wall 21 and fixed. The accommodating cavity is then filled with cooling oil 13 to form a closed working state. The arc side wall 22 is tightly pressed and fitted with the cylindrical motor shell 1 to fix the entire frequency converter. The frequency converter is sealed internally and fixed externally to the cylindrical motor shell 1, which also improves the heat dissipation performance of the frequency converter.

[0031] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A bowl-shaped frequency conversion device for a submersible pump, the submersible pump comprising a cylindrical motor housing (1), the frequency conversion device comprising a housing and a frequency conversion module arranged in the housing, characterized in that: The housing comprises a bowl-shaped lower shell (2) having a receiving cavity and an upper cover (3) sealing and fixing the bowl-shaped lower shell (2); the bowl-shaped lower shell (2) is integrally formed with a plane bottom wall (21) for fixing and installing a frequency conversion module and an arc side wall (22) for tightly press-fitting with a cylindrical motor housing (1); the plane bottom wall (21) protrudes inwardly with a mounting plane block (211); the mounting plane block (211) has a plurality of threaded blind holes (212); the frequency conversion module is threadedly fixed to the threaded blind holes (212) through a fixing member 1 (4); and the receiving cavity is filled with cooling oil (13).

2. A bowl-shaped frequency conversion device for a submersible pump according to claim 1, characterized in that: The plane bottom wall (21) has a plurality of circular bosses (213) protruding outwards, and the circular bosses (213) correspond one-to-one to the threaded blind holes (212). The frequency conversion module comprises a power tube (5) and a frequency conversion control board (6) which are fixedly connected. The power tube (5) abuts against the mounting plane block (211), and the frequency conversion control board (6) has a mounting hole (601) corresponding to the threaded blind hole (212). The fixing member (4) passes through the mounting hole (601), abuts against the power tube (5), and is screwed and fixed to the threaded blind hole (212).

3. A bowl-shaped frequency conversion device for a submersible pump according to claim 2, characterized in that: The plane bottom wall (21) has a plurality of evenly arranged heat dissipation plates (215) protruding outward, and a heat dissipation channel (214) is formed between two adjacent heat dissipation plates (215).

4. A bowl-shaped frequency conversion device for a submersible pump according to claim 3, characterized in that: The bowl-shaped lower shell (2) further comprises two symmetrically arranged flat plate side walls (23), the two flat plate side walls (23) being connected to the two arc side walls (22) in sequence, the flat plate side walls (23) protruding outwardly with a first mounting truncated platform (231), the first mounting truncated platform (231) being provided with a first fixing hole (232), the arc side walls (22) protruding inwardly with a second mounting truncated platform (221), the second mounting truncated platform (221) being provided with a fixing hole (232) The upper cover (3) is provided with a sealing member (7) between the upper cover (3) and the bowl-shaped lower shell (2); the upper cover (3) is provided with a fixing hole (301) corresponding to the fixing hole (232) and a fixing hole (302) corresponding to the fixing hole (222); the fastener (2) passes through the fixing hole (301) and is screwed and fixed to the fixing hole (232); the fastener (3) passes through the fixing hole (302) and is screwed and fixed to the fixing hole (222).

5. A bowl-shaped frequency conversion device for a submersible pump according to claim 4, characterized in that: The upper cover has a sealing boss (31) protruding inwardly, and the sealing member (7) is sleeved outside the sealing boss (31). The sealing member (7) has a through hole 1 (701) corresponding to the fixing hole 1 (232) and a through hole 2 (702) corresponding to the fixing hole 2 (222).

6. The bowl-shaped frequency conversion device for a submersible pump according to claim 4, characterized in that: The mounting truncated platform (231) is located in the middle of the flat plate side wall (23), and the outer peripheral surface of the mounting truncated platform (231) abuts against the inner wall of the motor housing (1).

7. A bowl-shaped frequency conversion device for a submersible pump according to claim 6, characterized in that: The mounting truncated platform (231) and the flat plate side wall (23) are connected with an L-shaped reinforcing plate (233), and the outer peripheral surface of the reinforcing plate (233) abuts against the inner wall of the motor housing (1).

8. A bowl-shaped frequency conversion device for a submersible pump according to any one of claims 1 to 7, characterized in that: The upper cover (3) has an oil filling hole (303), and the oil filling hole (303) is a stepped threaded hole. The fastening bolt (8) passes through the sealing gasket (12) and is threadedly matched with the oil filling hole (303) to be fixed.

9. A bowl-shaped frequency conversion device for a submersible pump according to any one of claims 1 to 7, characterized in that: The upper cover (3) protrudes outwardly with a wire outlet mounting platform (32), the wire outlet mounting platform (32) is provided with a concave hole (321), a sealing rubber sheath (9) is embedded in the concave hole (321), the wire outlet mounting platform (32) is provided with a wire outlet through hole (322), a wire (10) passes through the wire outlet through hole (322), and the wire (10) passes through the sealing rubber sheath (9), and a pressure plate (11) is provided outside the sealing rubber sheath (9), and the pressure plate (11) is fixed on the wire outlet mounting platform (32).

Images