Mounting structure of built-in frequency conversion device for submersible pump

Abstract

The utility model provides a mounting structure of a built-in frequency conversion device for a submersible pump, and belongs to the technical field of submersible pumps. The technical problems that an existing built-in frequency conversion device for the submersible pump is not stable enough in installation structure, poor in sealing performance, inconvenient to install and the like are solved. According to the installation structure of the built-in frequency conversion device for the submersible pump, the submersible pump comprises a frequency conversion motor device used for driving the pump to work, the frequency conversion motor device comprises a cylindrical motor shell, and a motor assembly and the frequency conversion device are arranged in the cylindrical motor shell; the frequency conversion device comprises a cylindrical shell with a closed containing cavity and a frequency conversion module located in the containing cavity, the shell is provided with a flat plate side wall, a bent elastic fixing piece is arranged in the containing cavity, and the frequency conversion module tightly abuts against the inner side face of the flat plate side wall through elastic deformation of the elastic fixing piece. The LED lamp is good in stability and sealing performance, and heat dissipation is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of submersible pumps, in particular to an installation structure of a built-in 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 water 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. In the existing technology, there is a variable frequency motor controlled by an external inverter, which separates the inverter from the motor and connects it to the motor with a cable. Due to the high modulation frequency of the inverter, the cable has distributed inductance and the motor has distributed capacitance. When the inverter is working, the distributed inductance of the cable and the distributed capacitance of the motor generate a resonant voltage, which affects the motor current and voltage, and in severe cases, the winding will be broken down. The oscillating voltage will generate high-frequency radiation to pollute the electromagnetic spectrum. Due to the distortion of the motor current, the frequency conversion controller will be inaccurate in control, and in severe cases, it may not work properly. Using a built-in inverter can solve the side effects caused by the cable.

[0003] At present, for example, in the Chinese patent "An underwater frequency converter and its assembly method", patent number 2022106846348, the circuit component 200 is screwed and fixed by the screw 500 and the first threaded hole 121, and then the sealant is poured in the installation groove 120 so that the sealant covers the screw 500. However, the circuit component fixed by the screw needs to be drilled and tapped, which will increase the uncontrollable factors on the circuit component; and because the screw holes are processed on the casing, metal shavings need to be cleaned and processed, but we need multiple screws to fix, so there are many processing steps, and the uncontrollable factors will increase, such as insufficient installation of screws, residual metal shavings, leakage caused by the failure of a screw seal, etc., which will bring huge hidden dangers to the frequency converter.

[0004] Another example is the Chinese patent "A submersible pump with a frequency conversion device", patent number 2011103891979, which includes a pump assembly and a frequency conversion motor connected to the pump assembly. The frequency conversion motor includes a motor housing with a sealed motor cavity. The frequency conversion motor assembly and the frequency conversion device are installed in the motor housing. The frequency conversion motor and the frequency conversion device are separated by a shielding sleeve. The outer layer of the frequency conversion device is sealed and fixed between the shielding sleeve and the sealing end cover. Even if the frequency conversion device can be fixed in the motor housing without drilling holes, the heat generated by the frequency conversion device will cause the plastic seal outside the frequency conversion device to expand, causing the components to be damaged and fail, resulting in a shortened life of the frequency converter, and serious direct damage; the expansion of the plastic seal may cause cracks. Since water will enter the motor cavity during the operation of the submersible pump, the water will sink and may penetrate into the cracks of the expanded plastic seal, causing damage to the frequency conversion device.

[0005] Therefore, how to install the frequency converter built into the submersible pump stably, sealed and conveniently plays an important role in improving production efficiency and stability of the frequency converter. Summary of the invention

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a mounting structure for a built-in frequency conversion device for a submersible pump.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a mounting structure for a built-in frequency conversion device for a submersible pump, the submersible pump comprising a frequency conversion motor device for driving the pump to work, the frequency conversion motor device comprising a cylindrical motor shell, a motor assembly and a frequency conversion device are arranged in the cylindrical motor shell, the frequency conversion device comprises a cylindrical outer shell with a closed accommodating cavity and a frequency conversion module located in the accommodating cavity, the outer shell has a flat side wall, a bent elastic fixing part is arranged in the accommodating cavity, and the elastic fixing part presses the frequency conversion module tightly against the flat side wall through its elastic deformation.

[0008] The submersible pump includes a variable frequency motor device that drives the pump to work. The variable frequency device and the motor assembly are installed in the motor housing to form a motor with a built-in variable frequency device, which then drives the pump to work, thereby improving the safety of electricity use and avoiding electromagnetic interference caused by external cables. This solution also requires that the cooling oil 1 fill the entire accommodating cavity of the variable frequency device. The cooling oil 1 can better disperse the heat generated by the variable frequency device and transfer it to the cylindrical outer shell. After the outer shell and the cylindrical motor shell are tightly fitted and pressed, the heat is transferred from the cylindrical outer shell to the cylindrical motor shell. The outer periphery of the cylindrical motor shell is all water flow, and the external water flow can effectively take away the heat of the variable frequency device. Since the motor shell is also filled with cooling oil 2, some leakage will occur during the operation of the submersible pump. When water enters the motor housing, due to the different densities between water and cooling oil, water will sink to the bottom of the motor housing. To prevent water from penetrating into the frequency converter, this solution also makes the housing of the frequency converter so that the frequency converter module can be installed without drilling. The frequency converter module is tightly pressed against the inner side of the flat plate side wall through the elastic deformation of the elastic fixing, reducing the installation risk caused by the uncertainty caused by drilling. After the frequency converter module is tightly pressed against the inner side of the flat plate side wall, the generated heat will be transferred to the entire housing through the flat plate side wall and the cooling oil in the accommodating cavity. The housing and the motor housing are tightly pressed together, so that the heat can be better transferred to the motor housing and heat exchanged with the water outside the motor housing to reduce the temperature. The combination of the above features can make the frequency converter device stable and well sealed, and is also conducive to heat dissipation.

[0009] Furthermore, the frequency conversion module includes a plurality of power tubes, which are attached to the inner side surface of the flat plate side wall. The elastic fixing member includes a first force arm, a fulcrum portion and a second force arm connected in sequence. A limit block protrudes from the inner wall of the shell in the direction close to the power tube, and a first mounting groove is formed between the limit block and the flat plate side wall. After the elastic fixing member passes through the limit block and the power tube in a natural state, the first force arm is located in the first mounting groove and the second force arm is located on the power tube. A fastening strip passes under the first force arm, and the fastening strip presses the first force arm toward the limit block, while the limit block cooperates with the fulcrum portion to force the second force arm to rest against the power tube and press the power tube tightly against the inner side surface of the flat plate side wall.

[0010] The power tube in the frequency conversion module is the main heating element. The power tubes are fixed one by one against the side wall of the flat plate through elastic fixings, so that the heat of the power tube can be better transferred to the cylindrical outer shell and even the cylindrical motor shell. In order to make the elastic fixing have enough elastic force to press the power tube, the elastic fixing is integrally formed with a first force arm, a fulcrum part and a second force arm that are smoothly transitioned in sequence; the elastic fixing can pass through the gap between the limit block and the power tube in the natural state, the first force arm is located in the first installation groove, and the second force arm is located on the power tube, so that it is convenient to install the elastic fixing without affecting the power tube; the power tube does not need to be fixed with screws, and there is no need to process the installation screw holes, and there is no risk of loosening due to vibration, which is more stable and reliable. When fixing multiple power tubes, it only needs to be completed once, which is time-saving and convenient to install. The working state of the elastic fixing part starts when the fastening strip passes under the first force arm, that is, the fastening strip gives a force to the first force arm to force it to approach the limit block, and the outer end of the limit block abuts against the fulcrum to form a fulcrum. Through this fulcrum, when the first force arm approaches the limit block, it will force the second force arm to abut against the outer side of the power tube. In this way, the elastic fixing part can be installed conveniently, and the elastic fixing part can fix the power tube on the side wall of the flat plate to better dissipate heat, making the frequency conversion device stable and well sealed.

[0011] Furthermore, a fixed arm is bent at the end of the first force arm toward the direction of the fastening strip, a stop block protrudes on the side wall of the flat plate toward the direction of the limit block, and an open groove is provided on the stop block opposite to the position of the fixed arm, the notch of the open groove is connected to the first installation groove, and the fastening strip is fixed in the open groove by the fixed arm.

[0012] By using the fixed arm and the open slot in combination, the fastening strip and the elastic fixing piece restrain each other to form a self-locking structure. The fastening strip can fix the elastic fixing piece, and the elastic fixing piece also firmly fixes the fastening strip in the open slot, thereby improving the stability of the frequency converter.

[0013] Furthermore, the opening groove is semicircular, the fastening strip is cylindrical, and one end of the fastening strip has an inclined surface. The fastening strip is in the shape of a cone, that is, it is similar to a cone, and one end is sharper than the other end, so that the first force arm can be easily inserted when installing the fastening strip. In other words, after the elastic fixing part passes through the limit block and the power tube in a natural state, the tip of the fastening strip passes into the gap between the elastic fixing part and the opening groove, and then the first force arm is lifted through the conical surface of the fastening strip itself until the first force arm contacts the limit block, and the first force arm is fixed. The use of a conical wedge can also minimize the contact area between the fastening strip and the opening groove and the first force arm, minimize the resistance, and make it easier to install. The thickness of the fastening strip can adjust the force applied to the power tube by the elastic fixing part.

[0014] Furthermore, the end of the second lever arm has an arc wall, and the outer arc surface of the arc wall abuts against the power tube. After the second lever arm is compressed, the arc wall abuts against the power tube before the power tube. The second lever arm continues to be stressed so that the arc wall and the power tube have a certain relative movement. The arc wall can reduce the friction on the power tube and better stabilize the power tube.

[0015] Furthermore, the first force arm and the second force arm are staggered and cross-arranged on both sides of the fulcrum portion, and the fulcrum portion is in an S shape to smoothly connect the first force arm and the second force arm.

[0016] The elastic fixing part and the limit block form a lever. The principle of the lever is that when one end is pressed down, the other end will rise. If the elastic fixing part is made into a flat plate, it is necessary to provide a force-bearing space vertically above the frequency conversion module. Since the space inside the shell is limited after the frequency conversion module is installed, there is not enough space for one end of the flat elastic fixing part to bear force. Therefore, the fulcrum part is set in an S shape. The S-shaped setting can give the fulcrum part a height, and then the first force arm and the second force arm are located on both sides of the fulcrum part, staggered and cross-arranged, so that the first force arm and the second force arm are not in a straight line, the limit block and the first mounting groove are arranged on the side of the power tube, and the first mounting groove and the power tube form a stepped space gap for the elastic fixing part to pass through and be placed, and the first mounting groove and the power tube are in a straight line. The first force arm is subjected to force in the first mounting groove and then transmitted to the second force arm through the S-shaped fulcrum part, and the second force arm presses the power tube down on the side wall of the flat plate.

[0017] Furthermore, the fulcrum portion is divided into a plurality of S-shaped fulcrum elastic portions, and the second force arm is also divided into a flat plate portion corresponding to the S-shaped fulcrum elastic portion one by one. One end of the S-shaped fulcrum elastic portion smoothly transitions to the flat plate portion, and the other end smoothly transitions to the first force arm. The flat plate portion is elastically pressed against the power tube. There are a plurality of power tubes, and the number is relatively large. The elastic fixing member is relatively long as a whole. By dividing it into a plurality of S-shaped fulcrum elastic portions, the S-shaped fulcrum elastic portion has better elasticity and can better fix the power tube. The flat plate portion corresponding to the S-shaped fulcrum elastic portion one by one can also better correspond to each power tube, so that each power tube is subjected to a balanced force.

[0018] Furthermore, the first lever and the second lever are arranged to cross at an angle less than 90 degrees, and the fulcrum part is in an arc shape to smoothly connect the first lever and the second lever. The first lever and the second lever can also be arranged to cross at an angle less than 90 degrees, and the limit block and the first mounting groove are arranged on the side of the power tube. The first mounting groove and the power tube form a stepped space gap for the elastic fixing member to pass through and be placed. The first mounting groove and the power tube are in a straight line. The first lever is subjected to force in the first mounting groove and then transmitted to the second lever through the arc-shaped fulcrum part, and the second lever presses the power tube down on the side wall of the flat plate.

[0019] Furthermore, the outer shell includes an upper end cover, a lower end cover and a cylindrical body, the cylindrical body is tightly fitted and pressed against the inner wall of the motor shell, a seal 1 is arranged between the upper end cover and the cylindrical body, the upper end cover and the cylindrical body are fixed by a fixing member 1, a seal 2 is arranged between the lower end cover and the cylindrical body, the lower end cover and the cylindrical body are fixed by a fixing member 2.

[0020] Furthermore, the cylindrical body includes a flat side wall, a large arc side wall connected to the flat side wall at both ends, and a small arc side wall with a gap between the flat side wall and the flat side wall. The flat side wall is axially arranged. The frequency conversion module also includes a frequency conversion control board welded and fixed to the power tube. The inner wall of the shell also has a second mounting groove parallel to the flat side wall. The second mounting groove has two and is symmetrically arranged. The frequency conversion control board is embedded in the second mounting groove, and the frequency conversion control board is against the lower end cover.

[0021] Compared with the prior art, the utility model breaks the prejudice of the prior art through a simple and practical structure and a feasible solution, and is ingeniously designed. The utility model makes the housing of the frequency conversion device so that the frequency conversion module can be installed without drilling. The frequency conversion module is tightly pressed against the inner side of the flat side wall through the elastic deformation of the elastic fixing member. The structure is simple, easy to manufacture, and the installation risk caused by the uncertainty factors brought by drilling is reduced. Through the tight press-fitting of the housing and the motor housing, the frequency conversion module is tightly pressed against the inner side of the flat side wall, and the heat generated will be transferred to the motor housing through the flat side wall and the cooling oil in the accommodating cavity, so that the frequency conversion module can also exchange heat with the water outside the motor housing in a sealed environment to reduce the temperature. The limit block and the first mounting groove cooperate to facilitate the installation and removal of the elastic fixing member, and at the same time cooperate with the fastening strip to press the second force arm against the outer side of the power tube to fix the power tube. The length of the second force arm is between one and two times the length of the first force arm, and the fulcrum is S-shaped, which can more effectively utilize the internal space of the housing and control the overall size within the size of the motor housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the utility model.

[0023] Figure 2 It is an AA enlarged view of the utility model.

[0024] Figure 3 This utility model is a cross-sectional view Figure 2 .

[0025] Figure 4 It is a partial stereogram of the utility model.

[0026] Figure 5 It is a schematic diagram of the installation of the fastening strip of the utility model.

[0027] Figure 6 It is a schematic diagram of a second embodiment of the elastic fixing member of the utility model.

[0028] Figure 7 It is an exploded view of the utility model.

[0029] Figure 8 The utility model is a cross-sectional view Figure 3 .

[0030] Figure number marking: 1. Motor housing; 2. Outer shell; 21. Flat side wall; 22. Limit block; 23. First mounting slot; 24. Open slot; 25. Second mounting slot; 26. Large arc side wall; 27. Small arc side wall; 2a. Upper end cover; 2b. Lower end cover; 2c. Cylinder; 3. Frequency conversion module; 31. Power tube; 32. Frequency conversion control board; 4. Elastic fixing part; 41. First force arm; 42. Fulcrum part; 421. S-shaped fulcrum elastic part; 43. Second force arm; 431. Flat plate part; 44. Fixed arm; 45. Arc wall; 5. Fastening strip; 501. Inclined surface; 6. Seal one; 7. Fixing part one; 8. Seal two; 9. Fixing part two; 10. Cooling oil one. DETAILED DESCRIPTION

[0031] 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.

[0032] according to Figures 1 to 8 As shown, a mounting structure of a built-in frequency conversion device for a submersible pump, the submersible pump includes a frequency conversion motor device for driving the pump, the frequency conversion motor device is composed of a frequency conversion device and a motor, the motor has a motor housing 1, the motor housing 1 is also the motor housing 1 of the frequency conversion motor device, the frequency conversion device is built into the motor housing 1, and the connection with the motor assembly is realized in the motor housing 1, which improves the safety of electricity use and avoids the electromagnetic interference caused by the external cable. The motor assembly has a stator, a rotor, a motor shaft, etc., and the motor shaft is connected to the impeller in the pump to rotate the impeller.

[0033] The motor shell 1 of the frequency conversion motor device here is cylindrical, and a cylindrical shell 2 is also provided to fasten the frequency conversion device with the cylindrical motor shell 1. The specific frequency conversion device includes a cylindrical shell 2 with a closed accommodating cavity and a frequency conversion module 3 located in the accommodating cavity. The shell 2 has a flat side wall 21, and a bent elastic fixing member 4 is provided in the accommodating cavity. The elastic fixing member 4 presses the frequency conversion module 3 tightly against the inner side of the flat side wall 21 through its elastic deformation. After the frequency conversion module 3 is installed, the accommodating cavity needs to be filled with cooling oil 10. The cooling oil 10 can better disperse and transfer the heat generated by the frequency conversion device to the cylindrical shell 2. After the shell 2 and the cylindrical motor shell 1 are tightly fitted and pressed, the heat is transferred from the cylindrical shell 2 to the cylindrical motor shell 1. The outer periphery of the cylindrical motor shell 1 is water flow, and the external water flow can effectively take away the heat of the frequency conversion device. Since the motor casing 1 is also filled with cooling oil 2, some water will leak into the motor casing 1 during the operation of the submersible pump. Due to the different densities between water and cooling oil 2, water will sink to the bottom of the motor casing 1. In order to prevent water from penetrating into the frequency converter, the casing 2 of the frequency converter is made so that the frequency converter module 3 can be installed without drilling. The frequency converter module 3 is tightly pressed against the inner side of the flat side wall 21 through the elastic deformation of the elastic fixing part 4, reducing the installation risk caused by the uncertainty caused by drilling. After the frequency converter module 3 is tightly pressed against the inner side of the flat side wall 21, the generated heat will be transferred to the entire casing 2 through the flat side wall 21 and the cooling oil 10 in the accommodating cavity. The casing 2 and the motor casing 1 are tightly pressed together, so that the heat can be better transferred to the motor casing 1 and heat exchanged with the water outside the motor casing 1 to reduce the temperature. Of course, the entire frequency conversion device is detachably installed and fixed. When a problem occurs during use, the cooling oil 10 can be poured out and the frequency conversion module 3 in the frequency conversion device can be repaired, instead of plastic-sealing the frequency conversion module 3 and making it impossible to repair.

[0034] The frequency conversion module 3 includes a plurality of power tubes 31 and a frequency conversion control board 32. The power tubes 31 are attached to the inner side of the flat side wall 21. The elastic fixing member 4 includes a first force arm 41, a fulcrum 42, and a second force arm 43 which are smoothly connected in sequence. A limit block 22 protrudes from the inner wall of the housing 2 near the power tube 31. The limit block 22 is on the left side of the power tube and is slightly higher than the power tube. A first mounting groove 23 is formed between the limit block 22 and the flat side wall 21. The first mounting groove 23 and the power tube 31 are in a straight line. Figure 3As shown, the elastic fixing member 4 is in a natural state. At this time, the elastic fixing member 4 can easily pass between the limit block 22 and the power tube 31, and the first force arm 41 is located in the first installation groove 23, and the second force arm 43 is located on the power tube 31. The power tube 31 is located between the second force arm 43 and the flat side wall 21. Since the elastic fixing member 4 has no elasticity in the natural state, the second force arm 43 can also easily pass between the power tube 31 and the frequency conversion control board 32 and is located in the gap between the power tube 31 and the frequency conversion control board 32. Figure 2 As shown, when the fastening strip 5 passes through the bottom of the first lever 41, the fastening strip 5 presses the first lever 41 toward the limit block 22, and at the same time, the limit block 22 cooperates with the fulcrum portion 42 to force the second lever 43 to lean against the power tube 31 and the power tube 31 is tightly pressed against the inner side of the flat side wall 21. The working state of the elastic fixing member 4 starts when the fastening strip 5 passes through the bottom of the first lever 41, that is, the fastening strip 5 gives a force to the first lever 41 to force the first lever 41 to approach the limit block 22, and the outer end of the limit block 22 leans against the fulcrum portion 42 to form a fulcrum, through which when the first lever 41 approaches the limit block 22, the second lever 43 is forced to lean against the power tube 31, and the second lever 43 presses the power tube 31 tightly against the flat side wall 21.

[0035] Since the power tube 31 in the frequency conversion module 3 is the main heating element, the power tubes 31 are abutted against the flat side wall 21 one by one and fixed by the elastic fixing member 4, so that the heat of the power tube 31 can be better transferred to the cylindrical shell 2 and even the cylindrical motor shell 1.

[0036] like Figure 1-5As shown, a fixed arm 44 is bent at the end of the first force arm 41 toward the direction of the fastening strip 5, and a stopper is protruded on the flat side wall 21 toward the direction of the limit block 22. An open slot 24 is provided on the stopper, which is opposite to the position of the fixed arm 44. The notch of the open slot 24 is connected to the first installation slot 23, and the fastening strip 5 is elastically pressed and fixed in the open slot 24 by the first force arm 41 of the fixed arm 44. By using the fixed arm 44 and the open slot 24 in coordination, the fastening strip 5 and the elastic fixing member 4 are mutually constrained to form a self-locking structure, that is, the fastening strip 5 can fix the elastic fixing member 4, and the elastic fixing member 4 also stabilizes the fastening strip 5 in the open slot 24, thereby improving the stability of the frequency conversion device. The open slot 24 is semicircular, the fastening strip 5 is cylindrical, and one end of the fastening strip 5 has an inclined surface 501. In this way, when installing the fastening strip 5, it is convenient to extend into the gap between the first force arm 41 and the open slot 24. That is to say, after the elastic fixing member 4 passes through the limit block 22 and the power tube 31 in a natural state, the end of the fastening strip 5 with the inclined surface 501 is relatively sharp and then passes through the gap between the fixed arm 44 and the opening groove 24, and then the first force arm 41 is lifted by the fastening strip 5 until the first force arm 41 contacts the limit block 22, and the first force arm 41 is fixed. The cylindrical fastening strip 5 has the least contact area with the semicircular opening groove 24 and the first force arm 41, and the resistance is also the least, which is easier to install. The thickness of the fastening strip 5 can adjust the force applied by the elastic fixing member 4 to the power tube 31.

[0037] like Figure 1-4 As shown, the end of the second lever arm 43 has an arc wall 45, and the outer arc surface of the arc wall 45 abuts against the power tube 31. After the second lever arm 43 is compressed, the arc wall 45 abuts against the power tube 31 before the power tube 31. The second lever arm 43 continues to be stressed so that the arc wall 45 and the power tube 31 have a certain relative movement. The arc wall 45 can reduce the friction on the power tube 31 and better stabilize the power tube 31.

[0038] like Figure 1-4 As shown, in order to make the elastic fixing member 4 have sufficient elastic force to press the power tube 31, the first force arm 41 and the second force arm 43 are staggered and cross-arranged on both sides of the fulcrum part 42, and the fulcrum part 42 is S-shaped and smoothly connects the first force arm 41 and the second force arm 43. The limit block and the first mounting groove 23 are arranged on the side of the power tube 31, the limit block 22 is slightly higher than the power tube, the first mounting groove 23 and the power tube 31 are in a straight line, the frequency conversion control board 32 is against the limit block 22, and the gap between the frequency conversion control board 32 and the power tube 31 forms a stepped space gap with the first mounting groove 23, and the stepped space gap can be passed through and placed by the elastic fixing member, the first force arm 41 is subjected to force in the first mounting groove 23 and then transmitted to the second force arm 43 through the S-shaped fulcrum part, and the second force arm 43 can press down the power tube 31 in the gap between the frequency conversion control board 32 and the power tube 31 to fix the power tube 31 on the flat side wall 21.

[0039] The point where the fulcrum part 42 contacts the limit block 22 forms a fulcrum, the length of the first force arm 41 is the distance from the force point where the first force arm 41 contacts the fastening strip 5 to the fulcrum, and the length of the second force arm 43 is the distance from the force point where the second force arm 43 contacts the power tube 31 to the fulcrum. The elastic fixing member 4 and the limit block 22 form a lever, and the fastening strip 5 is used to apply a force to the first force arm 41 so that the force is transmitted to the second force arm 43 through the fulcrum. However, when the fulcrum is closer to the fastening strip 5, that is, the length of the first force arm 41 is shortened and the length of the second force arm 43 is increased, the first force arm 41 will be deformed or even broken due to the excessive force caused by being too short; when the fulcrum is farther away from the fastening strip 5, that is, the length of the first force arm 41 is increased and the length of the second force arm 43 is shortened, in order to match the length of the first force arm 41, the length of the limit block 22 needs to be increased, and the limit block 22 will occupy the space of the shell, causing the shell to become larger as a whole. Therefore, the length of the second lever arm 43 is between 0.5 and 5 times the length of the first lever arm 41, and preferably between 1 and 3 times the length of the first lever arm 41. This can prevent the elastic fixing member 4 from deforming and save space, so that there is still enough elastic force to press the power tube 31.

[0040] like Figure 4 The fulcrum portion 42 is divided into a plurality of S-shaped fulcrum elastic portions 421, and the second force arm 43 is also divided into a flat plate portion 431 corresponding to the S-shaped fulcrum elastic portion 421. One end of the S-shaped fulcrum elastic portion 421 smoothly transitions to the flat plate portion 431, and the other end smoothly transitions to the first force arm 41. The flat plate portion 431 is elastically pressed against the power tube 31. There are a plurality of power tubes 31, and the number is relatively large. The elastic fixing member 4 is relatively long as a whole. By dividing it into a plurality of S-shaped fulcrum elastic portions 421, the S-shaped fulcrum elastic portion 421 has better elasticity and can better fix the power tube 31. The flat plate portion 431 corresponding to the S-shaped fulcrum elastic portion 421 can also better correspond to each power tube 31, so that each power tube 31 is subjected to a balanced force.

[0041] like Figure 6 As shown, in order to make the elastic fixing member 4 have enough elastic force to press the power tube 31, the first lever arm 41 and the second lever arm 43 can also be arranged to cross each other at an angle less than 90 degrees, and the fulcrum part 42 smoothly connects the first lever arm 41 and the second lever arm 43 in an arc shape.

[0042] like Figure 7As shown, the housing 2 includes an upper end cover 2a, a lower end cover 2b and a cylindrical body 2c, the cylindrical body 2c is tightly fitted and pressed against the inner wall of the motor housing 1, a sealing member 6 is arranged between the upper end cover 2a and the cylindrical body 2c, the upper end cover 2a and the cylindrical body 2c are fixed by a fixing member 7, a sealing member 28 is arranged between the lower end cover 2b and the cylindrical body 2c, and the lower end cover 2b and the cylindrical body 2c are fixed by a fixing member 29. The cylindrical body 2c includes a flat side wall 21, a large arc side wall 26 connected to the flat side wall 21, and a small arc side wall 27 with a gap between the flat side wall 21. The flat side wall 21 is axially arranged. The frequency conversion module 3 also includes a frequency conversion control board 32 welded and fixed to the power tube 31. The inner wall of the housing 2 also has a second mounting groove 25 parallel to the flat side wall 21. The second mounting groove 25 has two and symmetrically arranged. The frequency conversion control board 32 is embedded in the second mounting groove 25, and the frequency conversion control board 32 abuts against the lower end cover 2b. This makes it easy to install and disassemble the frequency conversion device. The cylinder 2c can be directly formed at one time, and the frequency conversion control board 32 is first installed through the second installation groove 25, and the frequency conversion control board 32 is against the lower end cover 2b. At this time, the frequency conversion control board 32 has a basic fixation up and down, left and right, and the frequency conversion control board 32 and the power tube 31 are welded and fixed. The power tube 31 is also attached to the flat side wall 21 at this time, and then the elastic fixing member 4 in the natural state is passed through the gap between the power tube 31 and the limit block 22. After the elastic fixing member 4 is installed, the sharper end of the fastening strip 5 begins to penetrate under the elastic fixing member 4 until the fastening strip 5 is fully inserted. The power tubes 31 are arranged symmetrically in two rows, so the elastic fixing members 4 are also arranged symmetrically in two rows. The utility model breaks the prejudice of the prior art through a simple structure and a practical solution, and is ingeniously conceived. The utility model makes the housing 2 of the frequency conversion device so that the frequency conversion module 3 can be installed without drilling holes, and the frequency conversion module 3 is tightly pressed against the inner side of the flat side wall 21 through the elastic deformation of the elastic fixing member 4. The structure is simple and easy to manufacture, and the installation risk caused by the uncertainty factors brought by drilling holes is also reduced.

[0043] 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 mounting structure for a submersible pump with a built-in frequency conversion device, the submersible pump comprising a frequency conversion motor device for driving the pump, the frequency conversion motor device comprising a cylindrical motor housing (1), a motor assembly and a frequency conversion device being arranged in the cylindrical motor housing (1), characterized in that: The frequency conversion device comprises a cylindrical housing (2) having a closed accommodating cavity and a frequency conversion module (3) located in the accommodating cavity, the housing (2) having a flat side wall (21), a bent elastic fixing member (4) being arranged in the accommodating cavity, the elastic fixing member (4) pressing the frequency conversion module (3) tightly against the flat side wall (21) through its elastic deformation.

2. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 1, characterized in that: The frequency conversion module (3) comprises a plurality of power tubes (31), wherein the power tubes (31) are attached to the inner side surface of the flat plate side wall (21); the elastic fixing member (4) comprises a first force arm (41), a fulcrum portion (42) and a second force arm (43) connected in sequence; a limit block (22) protrudes from the inner wall of the housing (2) in a direction close to the power tube (31); a first mounting groove (23) is formed between the limit block (22) and the flat plate side wall (21); and the elastic fixing member (4) passes through the limit block (22) in a natural state. 2) and the power tube (31), the first force arm (41) is located in the first installation groove (23), the second force arm (43) is located on the power tube (31), and a fastening strip (5) passes through the lower part of the first force arm (41), the fastening strip (5) presses the first force arm (41) toward the limit block (22), and the limit block (22) cooperates with the fulcrum (42) to force the second force arm (43) to abut against the power tube (31) and to tightly abut the power tube (31) against the inner side surface of the flat plate side wall (21).

3. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 2, characterized in that: The end of the first force arm (41) is bent toward the direction of the fastening strip (5) to form a fixed arm (44); a stopper is protruded from the side wall (21) of the flat plate toward the direction of the limit block (22); an opening groove (24) is provided on the stopper and is opposite to the position of the fixed arm (44); the notch of the opening groove (24) is connected to the first installation groove (23); and the fastening strip (5) is fixed in the opening groove (24) by the fixed arm (44) under pressure.

4. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 3, characterized in that: The opening groove (24) is semicircular, the fastening strip (5) is cylindrical, and one end of the fastening strip (5) has an inclined surface (501).

5. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 3, characterized in that: The end of the second force arm (43) has an arc wall (45), and the outer arc surface of the arc wall (45) abuts against the power tube (31).

6. The mounting structure of a built-in frequency conversion device for a submersible pump according to any one of claims 2 to 5, characterized in that: The first force arm (41) and the second force arm (43) are disposed on both sides of the fulcrum portion (42) in an offset and cross-arranged manner, and the fulcrum portion (42) is in an S-shape and smoothly connects the first force arm (41) and the second force arm (43).

7. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 6, characterized in that: The fulcrum portion (42) is divided into a plurality of S-shaped fulcrum elastic portions (421), and the second force arm (43) is also divided into flat plate portions (431) corresponding one to one with the S-shaped fulcrum elastic portions (421). One end of the S-shaped fulcrum elastic portion (421) is smoothly transitioned to the flat plate portion (431), and the other end of the S-shaped fulcrum elastic portion (421) is smoothly transitioned to the first force arm (41), and the flat plate portion (431) is elastically pressed against the power tube (31).

8. The mounting structure of a built-in frequency conversion device for a submersible pump according to any one of claims 2 to 5, characterized in that: The first force arm (41) and the second force arm (43) are arranged to cross each other at an angle less than 90 degrees, and the fulcrum portion (42) is in an arc shape to smoothly connect the first force arm (41) and the second force arm (43).

9. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 1, characterized in that: The housing (2) comprises an upper end cover (2a), a lower end cover (2b) and a cylindrical body (2c); the cylindrical body (2c) is tightly fitted and press-fitted with the inner wall of the motor housing (1); a sealing member (6) is provided between the upper end cover (2a) and the cylindrical body (2c); the upper end cover (2a) and the cylindrical body (2c) are fixed by a fixing member (7); a sealing member (8) is provided between the lower end cover (2b) and the cylindrical body (2c); and the lower end cover (2b) and the cylindrical body (2c) are fixed by a fixing member (9).

10. The mounting structure of a built-in frequency conversion device for a submersible pump according to claim 9, characterized in that: The cylindrical body (2c) comprises a flat side wall (21), a large arc side wall (26) connected end to end to the flat side wall (21), and a small arc side wall (27) having a gap with the flat side wall (21); the flat side wall (21) is arranged axially; the frequency conversion module (3) further comprises a frequency conversion control board (32) welded and fixed to the power tube (31); the inner wall of the housing (2) further comprises a second mounting groove (25) parallel to the flat side wall (21); the second mounting groove (25) has two and is symmetrically arranged; the frequency conversion control board (32) is embedded in the second mounting groove (25), and the frequency conversion control board (32) abuts against the lower end cover (2b).

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