A flameproof variable frequency permanent magnet motor

Abstract

The present invention belongs to the technical field of electric motors, and is particularly a flameproof variable frequency permanent magnet electric motor, comprising a motor body and a protective member, a limited position sink groove is provided on the inner wall of the shell of the motor body, the limited position sink groove is connected with the air-permeable groove provided on the side wall of the shell, a cover of the protective member is arranged on the outer wall of the shell, and is arranged one-to-one with the air-permeable groove, an outlet pipe connected to one end of the cover is connected to a connecting seat on an inlet pipe connected to the other end through a return pipe, a gas storage tank is arranged on the connecting seat, and a piston member arranged in the cover is fixedly connected to a driving bushing ring through a push rod. The present invention installs a protective member on the shell of the motor, fills the inside of the motor with protective gas, avoids the generation of electric sparks during operation, and achieves the flameproof effect of the motor, and at the same time, the protective gas circulates and quickly takes away the heat generated by the internal operation of the motor, improves the heat dissipation efficiency of the motor, ensures the stable operation of the motor, does not need to use a special flameproof shell, and reduces the production cost of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to a flameproof variable frequency permanent magnet motor. Background Art

[0002] Flameproof variable frequency permanent magnet motor is a special motor that combines flameproof technology, frequency conversion technology and permanent magnet technology. This motor has the characteristics of high efficiency, energy saving, environmental protection and safety. It is widely used in flammable and explosive places such as petroleum, chemical industry, coal, and other industrial fields that require explosion-proof requirements.

[0003] The explosion-proof grade and structural type of the flameproof variable frequency permanent magnet motor meet the relevant standards and regulations. It uses a flameproof enclosure, which can effectively prevent the internal explosion from spreading outward and protect the safety of the surrounding environment. However, the use of a flameproof enclosure cannot avoid the generation of electric sparks inside the motor during operation. At the same time, the flameproof enclosure has high requirements for materials and processes, which increases the production cost of the motor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a flameproof variable frequency permanent magnet motor, which solves the problem that sparks cannot be avoided inside the motor during operation when using a flameproof casing, and that the flameproof casing has high requirements on materials and processes, thereby increasing the production cost of the motor.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A flameproof variable frequency permanent magnet motor comprises a motor body and a protective member, wherein a limit groove is provided on the inner wall of the shell of the motor body, the limit groove is connected with a breathable through groove provided on the side wall of the shell, and a cover of the protective member is arranged on the outer wall of the shell and is arranged one-to-one with the breathable through groove, an air outlet pipe connected at one end of the cover is connected with a connecting seat on an air inlet pipe connected at the other end through a return pipe, an air storage tank is arranged on the connecting seat, and a piston member arranged in the cover is fixedly connected to a driving bushing through a push rod, and a driving rod matched with the driving bushing is fixedly connected to the shaft of a rotor inside the motor body.

[0007] Furthermore, one end of the sealing cover is connected to the air inlet pipe through a first branch pipe, and the other end is connected to the air outlet pipe through a second branch pipe, and a one-way pressure relief valve is installed in a connecting seat integrally arranged on the air inlet pipe, the air inlet pipe is connected to the air outlet port of the air storage tank through the connecting seat, and a pipe cooler is installed on the return pipe connected to the air outlet pipe, one end of the return pipe is connected to the return air hole opened on the side wall of the connecting seat, a connecting ear is integrally arranged on the air inlet pipe, the connecting ear is fixedly connected to the end cover by screws, and a one-way pressure relief valve is installed on the return pipe, and the one-way pressure relief valve is installed at the connecting portion of the return pipe and the connecting seat.

[0008] Furthermore, the length of the cover is greater than the length of the air-permeable groove on the outer shell, and a sealing ring is embedded in the sealing groove opened at the edge of the piston plate of the piston member in the cover, the sealing ring slides against the inner wall of the cavity between the cover and the outer shell, and one side of the piston plate is in contact with the return spring, and the other end of the return spring is in contact with the inner wall of one end of the cover, and the connecting sleeve integrally arranged at the end of the push rod fixedly connected to the other side of the piston plate is detachably connected to the socket arranged on the outer wall of the driving liner ring through a plug pin, a sealing gasket is arranged at the connection between the cover and the outer wall of the outer shell, and the piston plate is initially located in the middle part of the cavity between the cover and the outer shell, dividing the cavity into an air intake cavity and a compression reflux cavity, and the piston plate is initially located on the air-permeable groove and does not overlap with the end part.

[0009] Furthermore, the driving liner ring is slidably arranged in a limiting groove opened on the inner wall of the outer shell, the plug-in seat is slidably connected to the air-permeable groove and is arranged one-to-one with the air-permeable groove, the plug-in seat is fixedly connected to the outer wall of the driving liner ring by screws, and a spiral spiral baffle is integrally arranged on the inner wall of the driving liner ring, and a resistance rod of the driving rod is slidably abutted on the spiral baffle bar, and the resistance rod is abutted on the end of the spiral baffle bar away from the connecting ring in the initial state, and the connecting ring is fixedly sleeved on the shaft of the rotor.

[0010] Furthermore, a heat dissipation fin plate distributed in a circular array is integrally provided on the outer wall of the shell, and bolt seats are integrally provided at both ends of the shell, the end cover is fixedly connected to the shell by bolts, a sealing gasket is arranged at the connection position between the end cover and the shell, and an insertion sleeve of the rotor shaft is integrally provided on the end cover, and the insertion sleeve is rotatably connected to the shaft through a sealing bearing, a stator matching the rotor is arranged in the internal cavity of the shell, the outer wall of the stator does not contact the inner wall of the shell, and one end of the stator facing away from the driving rod is fixedly connected to the inner wall of the shell, and a support frame is arranged at the lower part of the shell, and the upper end of the support frame is fixedly connected to the bolt seat at the lower part of the shell.

[0011] Compared with the prior art, the present invention provides a flameproof variable frequency permanent magnet motor, which has the following beneficial effects:

[0012] The present invention installs a protective part on the casing of the motor and fills the interior of the motor with protective gas to avoid electric sparks during operation, thereby achieving the explosion-proof effect of the motor. At the same time, the protective gas circulates inside the motor to quickly take away the heat generated by the internal operation of the motor, thereby improving the heat dissipation efficiency of the motor and ensuring the stable operation of the motor. There is no need to use a special explosion-proof casing, thereby reducing the production cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of the housing in the present invention;

[0015] Figure 3 It is a schematic diagram of the structure of the protective member in the present invention;

[0016] Figure 4 It is a schematic diagram of the structure of the gas storage tank, the air inlet pipe, the sealing cover and the air outlet pipe in the present invention;

[0017] Figure 5 It is a structural schematic diagram of the piston member in the present invention;

[0018] Figure 6 It is a schematic structural diagram of the driving bushing and the driving rod in the present invention.

[0019] In the figure: 1. motor body; 101. rotor; 102. housing; 1021. heat dissipation fin plate; 1022. bolt seat; 1023. limit sink; 1024. air-permeable groove; 103. end cover; 104. support frame; 2. protective part; 201. gas storage tank; 202. air intake pipe; 2021. connection seat; 2022. connection ear; 203. cover; 2031. first branch pipe; 2032. second branch pipe; 204, air outlet pipe; 2041, return pipe; 2042, pipe cooler; 205, piston member; 2051, piston plate; 2052, sealing ring; 2053, push rod; 2054, connecting sleeve; 2055, plug pin; 2056, return spring; 206, drive bushing; 2061, plug socket; 2062, spiral baffle; 207, drive rod; 2071, resistance rod; 2072, connecting ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, an embodiment of the present invention proposes: a flameproof variable frequency permanent magnet motor, comprising a motor body 1 and a protective member 2, a limited position sinking groove 1023 is provided on the inner wall of the shell 102 of the motor body 1, the limited position sinking groove 1023 is connected with the air permeable groove 1024 provided on the side wall of the shell 102, and the cover 203 of the protective member 2 is arranged on the outer wall of the shell 102, and is arranged one by one with the air permeable groove 1024, so as to ensure that the protective gas entering the cover 203 enters the interior of the motor from the position of the air permeable groove 1024, effectively protect the interior of the motor, avoid the generation of electric sparks inside the motor during the operation of the motor, and ensure the stable and smooth operation of the motor, the outlet pipe 204 connected at one end of the cover 203 is connected to the connecting seat 2021 on the air inlet pipe 202 connected at the other end through the return pipe 2041, and the connecting seat 2021 is provided with a gas storage tank 201, so as to facilitate the protective gas in the gas storage tank 201 to enter the air inlet The pipe 202 enters the cover 203, and then flows from the cover 203 into the interior of the motor for effective protection. At the same time, the protective gas that absorbs heat inside the motor is transported from the cover 203 to the outlet pipe 204, and the protective gas that absorbs heat is cooled, and then flows back to the intake pipe 202 for recycling. The piston member 205 arranged in the cover 203 is fixedly connected to the driving bushing 206 through the push rod 2053, and the driving rod 207 arranged on the driving bushing 206 is fixedly connected to the shaft of the rotor 101 inside the motor body 1, so that when the motor is running, the shaft of the rotor 101 can be used to drive the driving rod 207 to rotate, and the driving rod 207 can push the driving bushing 206 to slide on the outer shell 102. During the sliding process, the driving bushing 206 runs with the piston member 205, and pushes the protective gas that absorbs heat from the cover 203 into the outlet pipe 204, so as to realize the circulation of the protective gas.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, one end of the sealing cover 203 is connected to the air inlet pipe 202 through the first branch pipe 2031, and the other end is connected to the air outlet pipe 204 through the second branch pipe 2032, so that the sealing cover 203, the air inlet pipe 202 and the air outlet pipe 204 are stably connected together, so that the protective gas can flow smoothly among the three to form a circulation, so as to stably and effectively protect the inside of the motor, and a one-way pressure relief valve is arranged in the connecting seat 2021 integrally arranged on the air inlet pipe 202, and the air inlet pipe 202 is connected to the air outlet port of the gas storage tank 201 through the connecting seat 2021, and the gas storage tank 201 is stably installed on the air inlet pipe 202. At the same time, the one-way pressure relief valve is used to ensure that the gas storage tank 201 can stably supply protective gas to the air inlet pipe 202 to avoid backflow of protective gas. When the protective gas inside the motor is insufficient and the air pressure becomes small, the gas storage tank 20 1. The protective gas can be supplied to the inside of the motor in time to effectively protect the motor. A pipe cooler 2042 is installed on the return pipe 2041 connected to the outlet pipe 204. One end of the return pipe 2041 is connected to the return air hole opened on the side wall of the connecting seat 2021. The return air hole is opened between the one-way pressure relief valve installed on the connecting seat 2021 and the transition part connected to the intake pipe 202, so that the return protective gas can smoothly enter the intake pipe 202, which is convenient for cooling the high-temperature protective gas discharged from the motor. At the same time, the protective gas after cooling is transported to the connecting seat 221 and enters the motor from the intake pipe 202 for recycling. In this process, the circulating flow of the protective gas is used to quickly take away the heat generated by the internal operation of the motor, improve the heat dissipation efficiency of the motor, and ensure the stable operation of the motor.

[0023] The air inlet pipe 202 is integrally provided with a connecting ear 2022, which is fixedly connected to the end cover 103 by screws, so that the air inlet pipe 202 can be stably installed on the motor, so as to be stably used and transport the protective gas to the inside of the motor. A one-way pressure relief valve is arranged on the return pipe 2041, and the one-way pressure relief valve is arranged at the connection part between the return pipe 2041 and the connecting seat 2021 to prevent the protective gas from entering the return pipe 2041 from flowing back. When the gas enters the inside of the pipe and the air pressure increases, the one-way pressure relief valve opens to input the cooled gas into the air inlet pipe 202 for recycling.

[0024] The length of the cover 203 is greater than the length of the air-permeable groove 1024 on the shell 102, so that the air-permeable groove 1024 can be covered to ensure that the protective gas input from the air inlet pipe 202 to the cover 203 can smoothly enter the interior of the motor, effectively protect the interior of the motor, and avoid electric sparks generated inside the motor when the motor is running. In addition, a sealing ring 2052 is embedded in the sealing groove opened at the edge of the piston plate 2051 of the piston member 205 in the cover 203, and the sealing ring 2052 slides against the inner wall of the cavity between the cover 203 and the shell 102 to ensure that the piston plate 2051 and the inner wall of the cavity are stably sealed and connected together. When the piston plate 2051 slides into the cavity without the air-permeable groove 1024, the protective gas in the cavity can be squeezed to increase the air pressure, so that the protective gas can smoothly enter the outlet pipe 204 to achieve protection. The protective gas circulates, and one side of the piston plate 2051 abuts against the return spring 2056, and the other end of the return spring 2056 abuts against the inner wall of one end of the cover 203, which is convenient for compressing the return spring 2056 during the sliding process of the piston plate 2051, and then when the piston plate 2051 loses the driving force, the return spring 2056 drives the piston plate 2051 to reset, and the next gas compression and pushing operation is performed. The connecting sleeve 2054 integrally arranged at the end of the push rod 2053 fixedly connected to the other side of the piston plate 2051 is detachably connected to the socket 2061 arranged on the outer wall of the driving bushing 206 through the plug pin 2055, which is convenient for stably connecting the piston plate 2051 to the driving bushing 206, so that during the movement of the driving bushing 206, the piston plate 2051 is driven to slide smoothly in the cavity between the cover 203 and the shell 102;

[0025] A sealing gasket is arranged at the connection position between the cover 203 and the outer wall of the shell 102 to ensure that the two are sealed and connected together to avoid leakage of the protective gas during use. In the initial state, the piston plate 2051 is located in the middle position of the cavity between the cover 203 and the shell 102, dividing the cavity into an air inlet cavity and a compression reflux cavity. In the initial state, the piston plate 2051 is located on the air permeable groove 1024 and does not overlap with the end portion, ensuring that the compression reflux cavity is connected with the inside of the motor in the initial state of the piston plate 2051, so that the protective gas can smoothly enter the cavity. During use, the protective gas flows from the air inlet pipe 202 to the air inlet cavity, and then enters the inside of the motor and the compression reflux cavity from the air permeable groove 1024 until the air intake is stopped after the air pressure is balanced. During the operation of the motor, as the piston plate 2051 moves, the protective gas in the compression reflux cavity is sent into the air outlet pipe 204, and is discharged from the reflux cavity after cooling. The air flow pipe 2041 enters the air intake pipe 202 for recycling, the air inside the air intake pipe 202 is replenished, the air pressure increases, the gas will again pass through the sealing cover 203 and the inside of the motor, and then the piston plate 2051 is reset, the compression reflux chamber is connected with the inside of the motor, and the protective gas that absorbs heat inside the motor enters the compression reflux chamber again, and this cycle is repeated continuously to achieve the purpose of protective gas circulation inside the motor. At the same time, if there is a leakage of protective gas, the air pressure of the circulation process becomes smaller, the one-way pressure relief valve on the connecting seat 2021 is opened, and the protective gas in the gas storage tank 201 enters the air intake pipe 202 again for gas replenishment to avoid the reduction of protective gas and the weakening of the protective effect. At the same time, the air pressure change caused by the heat of the protective gas during the circulation process is set as the air pressure safety change range, and xenon is selected as the protective gas. Therefore, it is necessary to ensure that the air flow in the motor working space is unobstructed, and to provide corresponding safety protection for the operators to avoid safety hazards;

[0026] The driving bushing 206 is slidably arranged in the limiting groove 1023 opened on the inner wall of the shell 102, so that the driving bushing 206 can move smoothly on the shell 102 and effectively drive the piston plate 2051. The socket 2061 is slidably connected in the breathable groove 1024 and is arranged one by one with the breathable groove 1024. The socket 2061 is fixedly connected to the outer wall of the driving bushing 206 by screws to ensure that the push rod 2053 is stably connected to the driving bushing 206, so that the two are stably connected together, and a spiral spiral baffle 2062 is integrally provided on the inner wall of the driving bushing 206, and the spiral baffle 2062 slides and abuts against a resistance rod 2071 of the driving rod 207. The resistance rod 2071 initially abuts against The connecting ring 2072 is fixedly mounted on the shaft of the rotor 101 so that when the rotor 101 rotates during the operation of the motor, the driving rod 207 is moved and rotated. During the rotation, the resistance rod 2071 slides on the spiral baffle 2062, thereby pushing the driving bushing 206 to slide on the outer shell 102. After the resistance rod 2071 slides from one end of the spiral baffle 2062 to the other end and separates from it, the driving bushing 206 loses the driving force. The driving bushing 206 will slide and reset together with the piston plate 2051 under the action of the reset spring 2056, and then the resistance rod 2071 will resist the initial resistance position on the spiral baffle 2062 again to perform the next driving operation.

[0027] like Figure 1 and Figure 2 As shown, in some embodiments, a heat dissipation fin plate 1021 distributed in a circular array is integrally provided on the outer wall of the housing 102 to improve the heat dissipation performance of the entire motor, and the heat generated inside the motor when it is running is quickly dissipated through the cooperation between the housing 102 and the heat dissipation fin plate 1021, so as to avoid excessive temperature when the motor is running and ensure stable operation of the motor, and bolt seats 1022 are integrally provided at both ends of the housing 102, and the end cover 103 is fixedly connected to the housing 102 by bolts, and a sealing gasket is arranged at the connection part between the end cover 103 and the housing 102, so as to facilitate the stable installation of the end cover 103 on the housing 102, and the gap at the connection part between the two is blocked to avoid leakage of the internal protective gas during operation, and the end cover 103 is integrally provided with an interpenetrating sleeve of the shaft body of the rotor 101, and the interpenetrating sleeve is rotatably connected to the shaft body through a sealed bearing, so as to ensure that the rotor 101 is stably installed in the motor, and then output power when the motor is running;

[0028] A stator matching the rotor 101 is housed in the internal cavity of the housing 102, and the outer wall of the stator does not contact the inner wall of the housing 102, avoiding movement interference with the drive bushing 206 housed inside the housing 102, thereby ensuring smooth operation. The end of the stator facing away from the drive rod 207 is fixedly connected to the inner wall of the housing 102, and a support frame 104 is housed at the lower part of the housing 102. The upper end of the support frame 104 is fixedly connected to the bolt seat 1022 at the lower part of the housing 102, and the support frame 104 is used as the base of the motor to stably install the motor in the use position.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flameproof variable frequency permanent magnet motor, comprising a motor body (1) and a protective member (2), characterized in that: A limited position sink groove (1023) is provided on the inner wall of the housing (102) of the motor body (1), the limited position sink groove (1023) is connected to a venting groove (1024) provided on the side wall of the housing (102), and a cover (203) of the protective member (2) is arranged on the outer wall of the housing (102) and is arranged one-to-one with the venting groove (1024), and an outlet pipe (204) connected to one end of the cover (203) is connected to the venting groove (1024) through a return pipe (20 41) is connected to a connecting seat (2021) on an air intake pipe (202) connected to the other end, a gas storage tank (201) is mounted on the connecting seat (2021), and a piston member (205) mounted in the cover (203) is fixedly connected to a driving bushing (206) via a push rod (2053), and a driving rod (207) matched with the driving bushing (206) is fixedly connected to the shaft of the rotor (101) inside the motor body (1); One end of the cover (203) is connected to the air inlet pipe (202) via a first branch pipe (2031), and the other end is connected to the air outlet pipe (204) via a second branch pipe (2032), and a one-way pressure relief valve is arranged in a connecting seat (2021) integrally arranged on the air inlet pipe (202), the air inlet pipe (202) is connected to the air outlet port of the air storage tank (201) via the connecting seat (221), and a pipe cooler (2042) is arranged on the return pipe (2041) connected to the air outlet pipe (204), and one end of the return pipe (2041) is connected to a return air hole opened on the side wall of the connecting seat (2021); The length of the cover (203) is greater than the length of the air-permeable groove (1024) on the housing (102), and a sealing ring (2052) is embedded in a sealing groove provided at the edge of a piston plate (2051) of a piston member (205) in the cover (203), the sealing ring (2052) slidably abuts against the inner wall of the cavity between the cover (203) and the housing (102), and one side of the piston plate (2051) abuts against a return spring (2056), and the other end of the return spring (2056) abuts against the inner wall of one end of the cover (203), and a connecting sleeve (2054) integrally arranged at the end of a push rod (2053) fixedly connected to the other side of the piston plate (2051) is detachably connected to a socket (2061) disposed on the outer wall of a drive bushing (206) through a plug pin (2055); The driving bushing (206) is slidably arranged in a limiting recessed groove (1023) provided on the inner wall of the housing (102); the plug-in seat (2061) is slidably connected to the air-permeable groove (1024) and is arranged one-to-one with the air-permeable groove (1024); the plug-in seat (2061) is fixedly connected to the outer wall of the driving bushing (206) by screws; and a spiral retaining bar (2062) is integrally arranged on the inner wall of the driving bushing (206); a retaining bar (2071) of the driving rod (207) is slidably abutted against the retaining bar (2062); the retaining bar (2071) is initially abutted against one end of the spiral retaining bar (2062) away from the connecting ring (2072); and the connecting ring (2072) is fixedly sleeved on the shaft of the rotor (101); The air intake pipe (202) is integrally provided with a connecting ear (2022), the connecting ear (2022) being fixedly connected to the end cover (103) by means of screws, and a one-way pressure relief valve is arranged on the return pipe (2041), the one-way pressure relief valve being arranged at the connection portion between the return pipe (2041) and the connecting seat (221); A sealing gasket is arranged at the connection position between the cover (203) and the outer wall of the shell (102), and the piston plate (2051) is initially located at the middle position of the cavity between the cover (203) and the shell (102), dividing the cavity into an air intake cavity and a compression reflux cavity, and the piston plate (2051) is initially located on the air permeable groove (1024) and does not overlap with the end position.

2. The flameproof variable frequency permanent magnet motor according to claim 1, characterized in that: The outer wall of the housing (102) is integrally provided with heat dissipation fins (1021) distributed in a circular array, and bolt seats (1022) are integrally provided at both ends of the housing (102). The end cover (103) is fixedly connected to the housing (102) by bolts, a sealing gasket is arranged at the connection between the end cover (103) and the housing (102), and an insertion sleeve of the shaft body of the rotor (101) is integrally provided on the end cover (103), and the insertion sleeve is rotatably connected to the shaft body via a sealing bearing.

3. The flameproof variable frequency permanent magnet motor according to claim 2 is characterized in that: A stator matching the rotor (101) is arranged in the internal cavity of the housing (102); the outer wall of the stator does not contact the inner wall of the housing (102); one end of the stator facing away from the drive rod (207) is fixedly connected to the inner wall of the housing (102); a support frame (104) is arranged at the bottom of the housing (102); the upper end of the support frame (104) is fixedly connected to a bolt seat (1022) at the bottom of the housing (102).

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