CN215419826U

CN215419826U - Explosion-proof brushless direct current motor

Info

Publication number: CN215419826U
Application number: CN202121165675.3U
Authority: CN
Inventors: 刘江; 刘涛; 李强
Original assignee: Zhongshan Shijie Industrial Design Co ltd
Current assignee: Zhongshan Shijie Industrial Design Co ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2022-01-04
Anticipated expiration: 2031-05-27

Abstract

The utility model discloses an explosion-proof brushless direct current motor, which comprises a motor base, wherein a stator is arranged on the motor base, the stator comprises a coil support fixedly connected to the motor base, coils are uniformly arranged on the coil support in the circumferential direction, silicon steel sheets are arranged on the coils, part of the silicon steel sheets are blocked at the outer end of the coils, and a rotor which is made of a permanent magnet and can rotate relative to the stator is sleeved outside the stator; an explosion-proof shell capable of surrounding the coil to separate the coil from the outside is arranged between the motor base and the stator, and the explosion-proof shell is detachably connected to the stator. The explosion-proof device has the advantages of simple structure, low cost, convenience in automatic assembly, convenience in disassembly and maintenance and effective explosion prevention.

Description

Explosion-proof brushless direct current motor

Technical Field

The utility model relates to the technical field of brushless direct current motors, in particular to an explosion-proof brushless direct current motor.

Background

The household appliance using the refrigerant needs to have an explosion-proof requirement, and as part of the refrigerant has a combustible characteristic, when the refrigerant leaks and the motor fails, the coil can be subjected to spark after being damaged or broken, so that the risk of explosion caused by refrigerant ignition is increased.

The existing explosion-proof brushless direct current motor uses a plastic package process, namely a method for sealing a coil by pouring explosion-proof plastic, and the method has high cost, is difficult to automatically produce and cannot be disassembled for maintenance.

The present invention has been made based on such a situation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides the brushless direct current motor which is simple in structure, low in cost, convenient to assemble automatically, convenient to disassemble and maintain and effective in explosion prevention.

The utility model is realized by the following technical scheme:

an explosion-proof brushless direct current motor comprises a motor base, wherein a stator is arranged on the motor base, the stator comprises a coil support fixedly connected to the motor base, coils are uniformly arranged on the coil support in the circumferential direction, silicon steel sheets are arranged on the coils, part of the silicon steel sheets is blocked at the outer end of the coils, and a rotor which is made of a permanent magnet and can rotate relative to the stator is sleeved outside the stator; an explosion-proof shell capable of surrounding the coil to separate the coil from the outside is arranged between the motor base and the stator, and the explosion-proof shell is detachably connected to the stator.

The explosion-proof brushless direct current motor comprises an upper shell and a lower shell, wherein the stator is clamped between the upper shell and the lower shell, a connecting structure for detachably connecting the upper shell and the lower shell is arranged between the upper shell and the lower shell, and the connecting structure is positioned at a gap from the side surface of a coil to the outside; the upper housing covers the coil from above, and the connecting structure covers a gap from the side, through which the coil passes, to the outside.

According to the explosion-proof brushless direct current motor, the connecting structure comprises the upper isolation column arranged at the lower part of the upper shell and the lower isolation column arranged at the upper part of the lower shell and capable of being clamped with the corresponding upper isolation column, and a group of upper isolation columns and lower isolation columns are arranged at gaps between every two adjacent coils.

According to the explosion-proof brushless direct current motor, the lower part of the upper isolation column is provided with the clamping hook, the lower isolation column is provided with the insertion hole into which the lower part of the upper isolation column can be inserted, and the insertion hole is internally provided with the first limiting step which can be clamped by the clamping hook.

According to the explosion-proof brushless direct current motor, the second limiting step capable of limiting the insertion depth of the lower part of the upper isolation column in the insertion hole is arranged in the middle of the upper isolation column.

According to the explosion-proof brushless direct current motor, the lower portion of the coil support is provided with the lead inserting column for fixing and conducting, one pole lead of the coil is electrically connected with the lead inserting column, and the lower shell is provided with the positioning hole for inserting the lead inserting column.

According to the explosion-proof brushless direct current motor, the circuit substrate is arranged between the motor base and the lower shell, the lower end of the wire inserting column is fixedly connected with the circuit substrate, the wire inserting column is electrically connected with the circuit substrate, and the circuit substrate is connected with a wire used for connecting an external power supply.

According to the explosion-proof brushless direct current motor, the motor base is provided with the central column, the lower shell, the coil support and the upper shell are sequentially sleeved on the central column, and the coil support is fixedly connected to the central column.

According to the explosion-proof brushless direct current motor, the bottom of the lower shell is provided with the positioning flange, the motor base is provided with the clamping groove for inserting the bottom of the lower shell, and the clamping groove is provided with the positioning opening for clamping the positioning flange.

According to the explosion-proof brushless direct current motor, the lower shell and the upper shell are both made of insulating fireproof materials.

Compared with the prior art, the utility model has the following advantages:

1. an explosion-proof shell capable of surrounding the coil so as to separate the coil from the outside is arranged between the motor base and the stator, and the explosion-proof shell is detachably connected to the stator. Because the part of the silicon steel sheet is blocked at the outer end of the coil, the outer end of the coil is prevented from directly contacting with the outside air, a gap is reserved between adjacent coils, and the upper part and the lower part of each coil can also directly contact with the outside air. The coil can be surrounded by the explosion-proof shell, the coil is isolated from the outside air, and the coil is effectively prevented from being in direct contact with the outside air, so that once the combustible refrigerant leaks, the coil is damaged or broken down, sparks are generated, but due to the existence of the explosion-proof shell, the sparks cannot be in contact with the combustible refrigerant and ignite, and the explosion-proof shell is effective. In addition, because the explosion-proof shell is detachably connected to the stator, the explosion-proof shell is convenient to assemble, disassemble and maintain, the automatic assembly is facilitated, the structure is simple, and the cost is much lower than that of a plastic package process.

2. According to the utility model, a gap is directly formed between two adjacent coils, external air can contact the coils through the gap, but the connecting structure is inserted into the gap, so that the external air is effectively prevented from entering the gap, and although the gap is not completely sealed, sparks generated by the coils can be effectively blocked by the connecting structure and cannot ignite the external air. And the upper shell and the lower shell respectively clamp and shield the coil from the upper direction and the lower direction, so that the coil is wrapped by the upper shell, the lower shell, the connecting structure and the silicon steel sheet, and the explosion prevention is realized effectively.

3. The upper isolation column and the lower isolation column can be clamped correspondingly, so that the upper shell, the lower shell and the stator are fixed together; the upper isolation column and the lower isolation column are clamped together to form the connecting structure inserted in the gap between two adjacent coils. The lower part of the upper isolation column is provided with a clamping hook, the lower isolation column is provided with an insertion hole into which the lower part of the upper isolation column can be inserted, and a first limiting step which can be clamped by the clamping hook is arranged in the insertion hole. Namely, after the lower part of the upper isolation column is inserted into the jack, the first limiting step clamps the clamping hook, so that the upper isolation column and the lower isolation column are fastened together. Simple structure, easy assembly and disassembly.

4. The wire inserting column can be used for two purposes, namely, the wire inserting column is inserted into the positioning hole and can fix the coil support and the lower shell; and one pole lead of the wire inserted column coil is connected to conduct electricity between the coil and other parts, and the lead of the coil does not directly penetrate through the lower shell, so that the assembly is convenient, and the lead of the coil can be prevented from being pulled apart during the assembly.

Drawings

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings, in which:

FIG. 1 is a perspective view of the present invention (rotor not shown);

FIG. 2 is an exploded view of the present invention (rotor not shown);

FIG. 3 is a top view of the present invention (rotor not shown);

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

fig. 5 is a schematic diagram of the use of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 to 5, an explosion-proof brushless dc motor includes a motor base 1, a stator 2 is disposed on the motor base 1, the stator 2 includes a coil support 21 fixedly connected to the motor base 1, coils 211 are uniformly disposed on the coil support 21 in a circumferential direction, silicon steel sheets 212 are disposed on the coils 211, and portions of the silicon steel sheets 212 are blocked at outer ends of the coils 211, a rotor 3 made of a permanent magnet and capable of rotating relative to the stator 2 is disposed outside the stator 2, a gap is formed between the rotor 3 and the stator 2, and the rotor 3 is fixed on a rotating member; an explosion-proof shell 4 capable of surrounding the coil 211 so as to separate the coil 211 from the outside is arranged between the motor base 1 and the stator 2, and the explosion-proof shell 4 is detachably connected to the stator 2. Because the silicon steel sheet 212 is partially blocked at the outer end of the coil 211, the outer end of the coil 211 is prevented from directly contacting with the outside air, but a gap is still formed between adjacent coils 211, and the upper part and the lower part of each coil 211 can also directly contact with the outside air. And explosion-proof shell 4 can surround coil 211, keeps apart coil 211 and outside air, effectively prevents coil 211 and outside air direct contact, has produced the spark in case like this when the flammable refrigerant of emergence is leaked, coil 211 is damaged or is punctured, nevertheless because the existence of explosion-proof shell 4 for the spark can't contact and ignite the flammable refrigerant, thereby effective explosion-proof. In addition, because the explosion-proof shell 4 is detachably connected to the stator 2, the explosion-proof shell 4 is convenient to assemble, disassemble and maintain, the automatic assembly is facilitated, the structure is simple, and the cost is much lower than that of a plastic package process.

Specifically, the explosion-proof housing 4 includes an upper housing 41 and a lower housing 42, the stator 2 is sandwiched between the upper housing 41 and the lower housing 42, a connection structure for detachably connecting the upper housing 41 and the lower housing 42 is provided between the upper housing 41 and the lower housing 42, and the connection structure is located at a gap from the side of the coil 211 to the outside; the upper housing 41 covers the coil 211 from above, and the connecting structure covers the lateral gap between the coil 211 and the outside. As shown in fig. 2, there is a gap between two adjacent coils 211, and the external air may contact the coils 211 through the gap, but the connection structure is inserted at the gap, so that the external air is effectively blocked from entering the gap, and although not completely sealed, the sparks generated by the coils 211 can be effectively blocked by the connection structure and cannot ignite the external air. The upper shell 41 and the lower shell 42 respectively clamp and shield the coil 211 from the top and bottom, so that the coil 211 is wrapped by the connection structure of the upper shell 41 and the lower shell 42 and the silicon steel sheet 212, thereby effectively preventing explosion.

Specifically, the connection structure includes an upper isolation column 411 disposed at the lower portion of the upper housing 41, and a lower isolation column 421 disposed at the upper portion of the lower housing 42 and capable of being engaged with the corresponding upper isolation column 411, and a group of upper isolation columns 411 and a group of lower isolation columns 421 are disposed at a gap between two adjacent coils 211. That is, the corresponding upper and

lower spacers

411 and 421 can be engaged with each other, so as to fix the upper and

lower housings

41 and 42 and the stator 2 together; the upper isolation column 411 and the lower isolation column 421 are clamped together to form the connection structure inserted into the gap between two adjacent coils 211, and the connection structure is simple in structure and convenient to disassemble and assemble. Preferably, the upper isolation pillar 411 and the lower isolation pillar 421 should be adapted to the shape and size of the gap between two adjacent coils 211, so that the upper isolation pillar 411 and the lower isolation pillar 421 can effectively seal the gap.

Specifically, as shown in fig. 2 and 4, a hook 4111 is arranged at the lower part of the upper isolation column 411, an insertion hole 4211 into which the lower part of the upper isolation column 411 can be inserted is arranged on the lower isolation column 421, and a first limit step 4212 which can be clamped by the hook 4111 is arranged in the insertion hole 4211. That is, after the lower portion of the upper standoff column 411 is inserted into the insertion hole 4211, the first limit step 4212 catches the catch 4111, so that the upper standoff column 411 and the lower standoff column 421 are fastened together. Simple structure, easy assembly and disassembly.

Specifically, as shown in fig. 4, in order to further facilitate assembly, a second limiting step 4112 capable of limiting the insertion depth of the lower portion of the upper standoff column 411 in the insertion hole 4211 is disposed in the middle of the upper standoff column 411.

Specifically, the lower portion of the coil support 21 is provided with a wire insertion post 213 for fixing and conducting, a leading wire of one pole of the coil 211 is electrically connected to the wire insertion post 213, and the lower housing 42 is provided with a positioning hole 422 for inserting the wire insertion post 213. As shown in fig. 2, the wire insertion column 213 can be used for two purposes, one is that the wire insertion column 213 is inserted into the positioning hole 422, so as to fix the coil support 21 and the lower housing 42; the lead wire of one pole of the coil 211 of the wire inserting column 213 is connected to conduct electricity between the coil and other components, instead of using the lead wire of the coil 211 to directly pass through the lower shell 42, so that the assembly is convenient, and the lead wire of the coil 211 can be prevented from being torn off during the assembly.

Specifically, be equipped with circuit substrate 5 between motor base 1 and the lower casing 42, post 213 lower extreme and the 5 fixed connection of circuit substrate are inserted to the wire, just post 213 and the 5 electric connection of circuit substrate are inserted to the wire, circuit substrate 5 is connected with the wire that is used for connecing external power supply. The lower end of the wire inserting column 213 is preferably welded on the circuit substrate 5, so that the circuit substrate 5 is fixed on the coil support 21, and the coil 211 is electrically conducted with the circuit substrate 5, and the wire inserting column has a simple structure and is convenient to assemble.

Specifically, the motor base 1 is provided with a center post 11, the lower shell 42, the coil support 21 and the upper shell 41 are sequentially sleeved on the center post 11, and the coil support 21 is tightly connected to the center post 11. The coil support 21 and the central column 11 are preferably in interference fit, so that the coil support 21 is tightly fixed on the central column 11, the structure is simple, and the assembly is convenient.

Specifically, the bottom of the lower housing 42 is provided with a positioning flange 423, the motor base 1 is provided with a clamping groove 12 for inserting the bottom of the lower housing 42, and the clamping groove 12 is provided with a positioning opening 121 for clamping the positioning flange 423. The positioning flange 423 is clamped in the positioning opening 121, so that the lower shell 42 cannot rotate relative to the motor base 1, and the wire insertion column 213 is inserted into the positioning hole 422, so that the coil support 21 cannot rotate relative to the motor base 1, and the motor support is simple in structure and convenient to assemble.

Specifically, the lower shell 42 and the upper shell 41 are both made of insulating fireproof materials. The lower shell 42 and the upper shell 41 are preferably made of plastics, have certain fireproof capacity, and are easy to produce and low in cost.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An explosion-proof brushless DC motor which characterized in that: the motor comprises a motor base (1), wherein a stator (2) is arranged on the motor base (1), the stator (2) comprises a coil support (21) fixedly connected to the motor base (1), coils (211) are uniformly arranged on the coil support (21) in the circumferential direction, silicon steel sheets (212) are arranged on the coils (211), part of the silicon steel sheets (212) is blocked at the outer end of the coils (211), and a rotor (3) which is made of a permanent magnet and can rotate relative to the stator (2) is sleeved outside the stator (2); an explosion-proof shell (4) capable of surrounding the coil (211) to separate the coil (211) from the outside is arranged between the motor base (1) and the stator (2), and the explosion-proof shell (4) is detachably connected to the stator (2).

2. An explosion-proof brushless dc motor according to claim 1, characterized in that: the explosion-proof shell (4) comprises an upper shell (41) and a lower shell (42), the stator (2) is clamped between the upper shell (41) and the lower shell (42), a connecting structure for detachably connecting the upper shell (41) and the lower shell (42) is arranged between the upper shell (41) and the lower shell (42), and the connecting structure is positioned at a gap from the side surface of the coil (211) to the outside; the upper housing (41) covers the coil (211) from above, and the connecting structure covers a gap from the side, which leads the coil (211) to the outside.

3. An explosion-proof brushless dc motor according to claim 2, characterized in that: the connecting structure comprises an upper isolation column (411) arranged at the lower part of the upper shell (41) and a lower isolation column (421) arranged at the upper part of the lower shell (42) and capable of being clamped with the corresponding upper isolation column (411), and a group of upper isolation columns (411) and lower isolation columns (421) are arranged at gaps between every two adjacent coils (211).

4. An explosion-proof brushless dc motor according to claim 3, characterized in that: the lower portion of the upper isolation column (411) is provided with a clamping hook (4111), the lower isolation column (421) is provided with an insertion hole (4211) into which the lower portion of the upper isolation column (411) can be inserted, and a first limiting step (4212) clamped by the clamping hook (4111) is arranged in the insertion hole (4211).

5. An explosion-proof brushless dc motor according to claim 4, characterized in that: and a second limiting step (4112) capable of limiting the insertion depth of the lower part of the upper isolation column (411) in the insertion hole (4211) is arranged in the middle of the upper isolation column (411).

6. An explosion-proof brushless dc motor according to claim 2, characterized in that: the coil support (21) lower part is equipped with fixed and electrically conductive wire and inserts post (213), a utmost point lead wire and the wire of coil (211) are inserted post (213) electric connection, be equipped with on casing (42) down and supply wire to insert post (213) male locating hole (422).

7. An explosion-proof brushless dc motor according to claim 6, characterized in that: be equipped with circuit substrate (5) between motor base (1) and lower casing (42), post (213) lower extreme and circuit substrate (5) fixed connection are inserted to the wire, just post (213) and circuit substrate (5) electric connection are inserted to the wire, circuit substrate (5) are connected with the wire that is used for connecing external power source.

8. An explosion-proof brushless dc motor according to claim 7, characterized in that: the motor base (1) is provided with a center column (11), the lower shell (42), the coil support (21) and the upper shell (41) are sequentially sleeved on the center column (11), and the coil support (21) is fixedly connected to the center column (11).

9. An explosion-proof brushless dc motor according to claim 6, characterized in that: lower casing (42) bottom is equipped with location flange (423), be equipped with on motor base (1) and supply lower casing (42) bottom male draw-in groove (12), be equipped with location opening (121) that supply location flange (423) card to go into on draw-in groove (12).

10. An explosion-proof brushless dc motor according to claim 2, characterized in that: the lower shell (42) and the upper shell (41) are both made of insulating fireproof materials.