Brushless electronic water pump

Abstract

The utility model relates to a brushless electronic water pump which comprises a shell, the inner wall of the shell is fixedly connected with a stator, the middle of the shell is fixedly connected with a bearing, the outer surface of the bearing is fixedly connected with heat dissipation silicone grease, the interior of the bearing is fixedly connected with a rotating shaft, and one end of the rotating shaft penetrates out of an impeller to form an extending end. The efficient heat dissipation structure of the automobile electronic water pump has the advantages that due to the design of the efficient heat dissipation structure of the automobile electronic water pump, the heat dissipation hole is formed in the center of the bearing, the heat dissipation hole is connected with the circuit board, part of cooling water in the water pump can take away heat on the circuit board through the heat dissipation hole and the circuit board, and heat dissipation efficiency is improved; and the working temperatures of the electronic control board and the bearing are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of electronic water pumps, in particular to a brushless electronic water pump. Background Art

[0002] The brushless electronic water pump uses the principle of a permanent magnet brushless DC motor, with an impeller added to its rotor. The outer shell structure is designed to form a cavity that allows the liquid to move centrifugally. Since there is no carbon brush friction, no sparks will be generated. It has high efficiency, low power consumption, longer life than a brushed motor, and low noise.

[0003] The heat generated inside the existing brushless electronic water pump when running at high speed is difficult to dissipate in time. The magnetism of the permanent magnet will be reduced in a high temperature environment, and the life of other components will also be shortened. In particular, the bearings will generate more serious heat due to long-term rolling friction, and the electronic control board will also generate heat during operation.

[0004] To this end, the applicant has proposed a brushless electronic water pump, the patent number of which is:

[0005] CN215256842U, which adopts, includes a shell, the inner wall of the shell is fixedly connected with a stator, the middle part of the shell is fixedly connected with a bearing, the outer surface of the bearing is fixedly connected with heat dissipation silicone grease, the inside of the bearing is fixedly connected with a rotating shaft, the middle part of the rotating shaft is fixedly connected with a permanent magnet, the right side of the rotating shaft is fixedly connected with an impeller, the right side of the bearing is fixedly connected with a sealing ring, the two sides of the shell are provided with main water channels, the middle part of the shell is provided with a first water channel, the left side of the shell is provided with a second water channel, the right side of the shell is fixedly connected with a front cover, the right side of the front cover is fixedly connected with a water inlet pipe, the front cover The upper side of the shell is fixedly connected with a water outlet pipe, the left end of the shell is fixedly connected with an electronic control board, the right side of the electronic control board is fixedly connected with a thermally conductive silicone sheet, the left side of the shell is fixedly connected with a back cover, the right side of the back cover is fixedly connected with a ceramic heat sink, the surface of the back cover is provided with heat dissipation holes, and the bottom of the shell is fixedly connected with a base. Through the mechanism consisting of the main water channel, the second water channel, the thermally conductive silicone sheet, the ceramic heat sink, and the heat dissipation holes, the heat generated during the operation of the electronic control board is absorbed by the thermally conductive silicone sheet and transferred to the water flow in the second water channel, and part of the heat is absorbed by the ceramic heat sink and dissipated from the heat dissipation holes, thereby quickly cooling the electronic control board;

[0006] However, this structure still has defects. When the water pressure in the water chamber connected to the electronic water pump is unexpectedly insufficient or the water source is short of water, the electronic water pump is prone to frequent start and stop, which causes the life of the electronic components to be sharply shortened. It is necessary to improve this. Utility Model Content

[0007] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art.

[0008] Provides long life brushless electronic water pump with alarm assembly.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a brushless electronic water pump, comprising a shell, the inner wall of the shell is fixedly connected to a stator, the middle part of the shell is fixedly connected to a bearing, the outer surface of the bearing is fixedly connected to a heat dissipation silicone grease, the inside of the bearing is fixedly connected to a rotating shaft, the middle part of the rotating shaft is fixedly connected to a permanent magnet, the right side of the rotating shaft is fixedly connected to an impeller, the right side of the bearing is fixedly connected to a sealing ring, both sides of the shell are provided with main water channels, the middle part of the shell is provided with a first water channel, the left side of the shell is provided with a second water channel, and the shell A front cover is fixedly connected to the right side of the shell, a water inlet pipe is fixedly connected to the right side of the front cover, a water outlet pipe is fixedly connected to the upper side of the front cover, an electronic control board is fixedly connected to the left end of the shell, a thermal conductive silicone sheet is fixedly connected to the right side of the electronic control board, a rear cover is fixedly connected to the left side of the shell, a ceramic heat sink is fixedly connected to the right side of the rear cover, heat dissipation holes are opened on the surface of the rear cover, and a base is fixedly connected to the bottom of the shell, characterized in that one end of the rotating shaft passes through the impeller to form an extended end, and the extended end is equipped with an alarm component that can rotate with the rotating shaft.

[0010] By adopting the above technical scheme, the utility model provides an alarm component that can rotate with the rotating shaft on the rotating shaft. Under normal working conditions, the rotating shaft will drive the impeller to rotate continuously. When an abnormal situation occurs, as described in the background technology, when the water source in the water chamber connected to the electronic water pump has insufficient pressure or water shortage, the electronic water pump is prone to frequent start and stop. At this time, due to the lack of water inside the water pump, the water-cooled heat dissipation cannot work normally, and long-term idling can easily cause the water pump to burn out. By setting the alarm component, under normal working conditions, water continues to flow through the alarm component, driving the alarm component to rotate, so the alarm component will not sound an alarm. When no water flows through the alarm component or the water flows continuously for less than a certain time, the alarm component sends a signal to the electronic control board, informing the control board of the abnormal start and stop, thereby making the water pump inoperative for a certain period of time to prevent overheating and burning.

[0011] The above-mentioned brushless electronic water pump can be further configured as follows: the alarm component includes an alarm shell, a first cavity is provided at one end of the alarm shell, a switch sensor is provided in the first cavity, the first cavity is sealed after the switch sensor is installed, at least one first water inlet is provided at the other end of the alarm shell, an impeller accommodating cavity is provided in the middle of the alarm shell, an alarm impeller is provided in the impeller accommodating cavity, the alarm shell is provided with at least one first water outlet in the circumferential direction of the impeller accommodating cavity, a water outlet channel is formed between the first water inlet and the first water outlet, an alarm impeller shaft that can drive the alarm impeller to rotate is provided in the middle of the alarm impeller, one end of the alarm impeller shaft penetrates into the first cavity and is connected to a trigger member that can control the on and off of the switch sensor.

[0012] By adopting the above technical scheme, the switch sensor and the electronic control board are connected by wires or wirelessly, and the rotation of the alarm impeller triggers the switch sensor. No matter how large the hydraulic force of the water flow from the first water inlet through the first water outlet is, as long as it can continuously drive the alarm impeller to rotate for more than a certain period of time, the alarm impeller shaft can drive the trigger element to trigger the switch sensor, thereby energizing the entire component, so that no false alarm will be issued.

[0013] The brushless electronic water pump may be further configured as follows: the alarm impeller is disposed in the impeller accommodating chamber and is located between the first water inlet and the first water outlet.

[0014] By adopting the above technical scheme, in order to ensure that the water flow in the water channel of the alarm housing can cause the alarm impeller to rotate and drive the alarm impeller shaft to rotate, the alarm impeller is arranged between the first water inlet and the first water outlet. After the water flow enters the impeller accommodating cavity, it will first drive the alarm impeller to rotate, and then go out from the water outlet, thereby improving the working stability of the alarm component.

[0015] The above-mentioned brushless electronic water pump can be further configured as follows: a box body with an opening toward one end of the impeller accommodating cavity is provided in the first cavity, the trigger member is located in the box body, and the box body is provided with an avoidance groove with a give-way design at the corresponding position of the switch sensor; the first cavity is sealed with waterproof glue after the switch sensor is installed.

[0016] By adopting the above technical solution, a box body is set in the first cavity and the trigger is set in the box body. An avoidance groove is designed in the box body at the position of the switch sensor. On the one hand, it is convenient to install the switch sensor, and on the other hand, it also plays a role in the installation positioning of the switch sensor. After the switch sensor is installed, it is sealed with waterproof glue. After sealing, it is ensured that water will not enter the first cavity, thereby ensuring the sealing performance.

[0017] The above-mentioned brushless electronic water pump can be further configured as follows: the switch sensor includes a switch circuit board and a Hall sensor installed on the switch circuit board, the switch circuit board is electrically connected to the electronic control board through wires or wirelessly, and the trigger member is a magnet.

[0018] By adopting the above technical solution, the switch sensor is set as a switch circuit board and a Hall sensor installed on the switch circuit board. Of course, the switch circuit board is just a name, and it can be any circuit board that can install a Hall sensor and transmit the Hall sensor signal. When the alarm impeller rotates under the flushing of water flow, the magnet installed at one end of the alarm impeller shaft in the first cavity will rotate accordingly. When rotating, the Hall sensor will generate a pulse signal. The electronic control board will start the water pump when it detects a continuous pulse signal within a certain period of time, otherwise it will not start.

[0019] The brushless electronic water pump can be further configured as follows: the bottom opening of the main water channel is located at an end of the shell close to the impeller side, and the upper opening of the main water channel is located at an end of the impeller away from the alarm shell.

[0020] By adopting the above technical solution, the structure arranged in this way is more conducive to the flow of water.

[0021] The above-mentioned brushless electronic water pump can be further configured as follows: the main water channel is connected to the first water channel and the second water channel respectively, the first water channel passes through the inside of the heat dissipation silicone grease, the second water channel contacts the thermal conductive silicone sheet, the front cover and the rear cover are fixed to the shell by screws, the ceramic heat sink is connected to the electronic control board, and the heat dissipation holes correspond to the positions of the ceramic heat sink.

[0022] By adopting the above technical scheme, through the mechanism consisting of the main water channel, the second water channel, the thermally conductive silicone sheet, the ceramic heat sink, and the heat dissipation holes, the heat generated during the operation of the electronic control board is absorbed by the thermally conductive silicone sheet and transferred to the water flow in the second water channel. Part of the heat is absorbed by the ceramic heat sink and dissipated from the heat dissipation holes, thereby quickly cooling the electronic control board. This scheme is an existing scheme and will not be described in detail here.

[0023] The brushless electronic water pump may be further configured as follows: a plurality of first water inlets are provided on the alarm housing, and a flow guide structure is formed between the first water inlets to cause the water flowing from the first water inlets to the alarm impeller to form a vortex.

[0024] By adopting the above technical solution and providing a diversion structure, the water flow flowing in from the first water inlet is rotated in advance, thereby reducing the water flow that triggers the switch sensor and improving stability.

[0025] The brushless electronic water pump can be further configured as follows: the guide structure includes a guide column arranged at the first water inlet, each first water inlet is circumferentially arranged on the guide column, and the guide column is provided with an arc guide plate on one side of each water inlet.

[0026] By adopting the above technical solution, by setting up a guide column and an arc guide plate, the water flow is guided by the arc guide plate and then enters the impeller accommodating cavity through the first water inlet with a certain rotation, thereby reducing the water flow that triggers the switch sensor and improving stability.

[0027] The brushless electronic water pump may be further configured such that an angle less than 90° is formed between the arc-shaped guide plate and the first water inlet.

[0028] By adopting the above technical solution, the acute angle makes the pressure of water flow greater when entering the first water inlet, further reducing the required water flow rate.

[0029] The beneficial effects of the utility model are: 1. The design of the efficient heat dissipation structure of the automotive electronic water pump sets a heat dissipation hole in the center of the bearing, and the heat dissipation hole is connected with the circuit board. Part of the cooling water in the water pump will pass through the heat dissipation hole through the circuit board, take away the heat on the circuit board, and effectively reduce the working temperature of the electronic control board and the bearing.

[0030] 2. Integrated design of alarm components: This project sets up an alarm component on the circuit board of the brushless electronic water pump. The alarm component monitors the current on the circuit board. When the water flow in the water pump is too large, the current becomes larger. When it exceeds the limit value, the alarm component will alarm. When the water flow in the water pump is too small, the current becomes smaller and is lower than the minimum value. The alarm component will alarm, thereby extending the service life of the water pump.

[0031] 3. Optimization design of the guide structure: This project has designed a guide structure, including a guide column and an arc-shaped guide plate connected to the first water inlet. The arc-shaped guide plate and the first water inlet form an angle less than 90°, so that the water flow enters the impeller accommodating chamber through the first water inlet after a certain rotation under the guidance of the arc-shaped guide plate, further reducing the required water flow and improving the stability of the overall system.

[0032] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0034] Figure 2 It is the appearance diagram of the embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of the enlarged structure of the alarm housing of an embodiment of the utility model;

[0036] Figure 4 The enlarged three-dimensional structure diagram of the alarm housing of the utility model embodiment Figure 1 ;

[0037] Figure 5 The enlarged three-dimensional structure diagram of the alarm housing of the utility model embodiment Figure 2 ;

[0038] Figure 6 This is a schematic diagram of an exploded view of an alarm housing according to an embodiment of the utility model;

[0039] Figure 7 This is an enlarged schematic diagram of part A of an embodiment of the utility model;

[0040] Figure 8 This is an enlarged schematic diagram of part B of an embodiment of the utility model; DETAILED DESCRIPTION

[0041] like Figures 1 to 8 The brushless electronic water pump shown in the figure comprises a housing 1, a stator 2 is fixedly connected to the inner wall of the housing 1, a bearing 3 is fixedly connected to the middle of the housing 1, a heat dissipation silicone grease 4 is fixedly connected to the outer surface of the bearing 3, a rotating shaft 5 is fixedly connected to the inside of the bearing 3, a permanent magnet 6 is fixedly connected to the middle of the rotating shaft 5, an impeller 7 is fixedly connected to the right side of the rotating shaft 5, a sealing ring 8 is fixedly connected to the right side of the bearing 3, a main water channel 9 is opened inside the two sides of the housing 1, a first water channel 10 is opened in the middle of the housing 1, and a A second water channel 11 is provided, a front cover 12 is fixedly connected to the right side of the housing 1, a water inlet pipe 13 is fixedly connected to the right side of the front cover 12, a water outlet pipe 14 is fixedly connected to the upper side of the front cover 12, an electronic control board 15 is fixedly connected to the left end of the housing 1, a heat-conducting silicone sheet 16 is fixedly connected to the right side of the electronic control board 15, a rear cover 17 is fixedly connected to the left side of the housing 1, a ceramic heat sink 18 is fixedly connected to the right side of the rear cover 17, a heat dissipation hole 19 is opened on the surface of the rear cover 17, and a base 20 is fixedly connected to the bottom of the housing 1;

[0042] The bottom opening of the main water channel 9 is close to the water inlet pipe 13, and the upper opening of the main water channel 9 is close to the water outlet pipe 14. When the water pump is working, water can enter the main water channel 9 from the bottom opening and flow out from the upper opening; the main water channel 9 is connected to the first water channel 10 and the second water channel 11 respectively, and the water in the main water channel 9 flows through the first water channel 10 and the second water channel 11 respectively and then converges; the first water channel 10

[0043] The second water channel 11 passes through the heat dissipation silicone grease 4, and contacts the heat conductive silicone sheet 16. The water flow in the first water channel 10 can take away the heat on the heat dissipation silicone grease 4, and the water flow in the second water channel 11 can take away the heat on the heat conductive silicone sheet 16. The front cover 12 and the rear cover 17 are fixed to the housing 1 by screws, which is convenient for repairing the inside of the housing 1. The ceramic heat sink 18 is connected to the electronic control board 15, and the heat dissipation hole 19 corresponds to the position of the ceramic heat sink 18. The ceramic heat sink 18 can absorb the heat on the electronic control board 15 and dissipate it through the heat dissipation hole 19.

[0044] One end of the rotating shaft 5 passes through the impeller to form an extended end 51, and the extended end 51 is installed with an alarm component 501 that can rotate together with the rotating shaft 5;

[0045] By adopting the above technical scheme, the utility model provides an alarm component that can rotate with the rotating shaft on the rotating shaft. Under normal working conditions, the rotating shaft will drive the impeller to rotate continuously. When an abnormal situation occurs, as described in the background technology, when the water source in the water chamber connected to the electronic water pump has insufficient pressure or water shortage, the electronic water pump is prone to frequent start and stop. At this time, due to the lack of water inside the water pump, the water-cooled heat dissipation cannot work normally, and long-term idling can easily cause the water pump to burn out. By setting the alarm component, under normal working conditions, water continues to flow through the alarm component, driving the alarm component to rotate, so the alarm component will not sound an alarm. When no water flows through the alarm component or the water flows continuously for less than a certain time, the alarm component sends a signal to the electronic control board, informing the control board of the abnormal start and stop, thereby making the water pump inoperative for a certain period of time to prevent overheating and burning.

[0046] The alarm assembly includes an alarm housing 502, a first cavity 503 is provided at one end of the alarm housing 502, a switch sensor 504 is provided in the first cavity 503, and the first cavity 503 is sealed after the switch sensor 504 is installed. A plurality of first water inlets 505 are provided at the other end of the alarm housing 502, an impeller accommodating cavity 506 is provided in the middle of the alarm housing 502, an alarm impeller 507 is provided in the impeller accommodating cavity 506, and at least one first water outlet 508 is opened in the circumferential direction of the impeller accommodating cavity 506 of the alarm housing 502, a water outlet channel is formed between the first water inlet 505 and the first water outlet 508, an alarm impeller shaft 5071 which can drive the alarm impeller 507 to rotate is provided in the middle of the alarm impeller 507, one end of the alarm impeller shaft 5071 penetrates into the first cavity 503 and is connected to a trigger 509 which can control the on and off of the switch sensor 504;

[0047] The switch sensor is connected to the electronic control board through a wire or wirelessly. The alarm impeller rotates to trigger the switch sensor. The water flow from the first water inlet through the first water outlet drives the alarm impeller to rotate. No matter how large the hydraulic force of the water flow is, as long as it can continuously drive the alarm impeller to rotate for more than a certain period of time, the alarm impeller shaft can drive the trigger element to trigger the switch sensor, thereby realizing the power-on of the entire component, so that no false alarm will be issued;

[0048] The alarm impeller 507 is disposed in the impeller accommodating chamber 506 and is located between the first water inlet 505 and the first water outlet 508;

[0049] In order to ensure that the water flow in the water channel of the alarm housing can cause the alarm impeller to rotate and drive the alarm impeller shaft to rotate, the alarm impeller is arranged between the first water inlet and the first water outlet. After the water flow enters the impeller accommodating cavity, it will first drive the alarm impeller to rotate, and then it will go out from the water outlet, thereby improving the working stability of the alarm component;

[0050] A box body 510 is provided in the first cavity 503 and is open toward one end of the impeller accommodating cavity 506. The trigger member 509 is located in the box body 510. The box body 510 is provided with a relief groove designed to give way at a position corresponding to the switch sensor. After the switch sensor 504 is installed, the first cavity 503 is sealed by waterproof glue.

[0051] The trigger is arranged in the box body by arranging the box body in the first cavity, and an avoidance groove is designed in the box body at the position of the switch sensor, which is convenient for installing the switch sensor on the one hand, and also plays a role in the installation positioning of the switch sensor on the other hand. After the switch sensor is installed, it is sealed by waterproof glue, and after sealing, it is ensured that water will not enter the first cavity, thereby ensuring the sealing performance;

[0052] The switch sensor includes a switch circuit board and a Hall sensor installed on the switch circuit board, the switch circuit board is electrically connected to the electronic control board through wires or wirelessly, and the triggering member is a magnet;

[0053] The switch sensor is set as a switch circuit board and a Hall sensor installed on the switch circuit board. Of course, the switch circuit board is just a name, and it can be any circuit board that can install a Hall sensor and transmit a Hall sensor signal. When the alarm impeller rotates under the flushing of the water flow, the magnet installed at one end of the alarm impeller shaft located in the first cavity rotates along with it. When rotating, the Hall sensor generates a pulse signal. The electronic control board detects a continuous pulse signal for a certain period of time and turns on the water pump, otherwise it does not turn on;

[0054] The alarm housing 502 is provided with a plurality of first water inlets, and a flow guide structure is formed between the first water inlets to enable the water flowing from the first water inlets to the alarm impeller to form a vortex;

[0055] By setting a diversion structure, the water flowing in from the first water inlet is rotated in advance, reducing the water flow that triggers the switch sensor and improving stability;

[0056] The flow guiding structure includes a flow guiding column 511 arranged at the first water inlet, each first water inlet is arranged circumferentially on the flow guiding column 511, and the flow guiding column 511 is provided with an arc-shaped flow guiding plate 512 on one side of each water inlet 505;

[0057] By providing the guide column and the arc guide plate, the water flow is guided by the arc guide plate and then enters the impeller accommodating cavity through the first water inlet after a certain rotation, thereby reducing the water flow that triggers the switch sensor and improving stability;

[0058] An angle less than 90° is formed between the arc-shaped guide plate 512 and the first water inlet 505;

[0059] The acute angle makes the water flow have a greater pressure when entering the first water inlet, further reducing the required water flow rate;

[0060] The beneficial effect of the utility model is that the alarm capability of the brushless electronic water pump is improved by arranging the alarm component, so that the brushless electronic water pump can cope with more abnormal situations, thereby increasing the service life.

Claims

1. A brushless electronic water pump, comprising a shell, an inner wall of the shell is fixedly connected with a stator, a middle part of the shell is fixedly connected with a bearing, an outer surface of the bearing is fixedly connected with a heat dissipation silicone grease, a rotating shaft is fixedly connected inside the bearing, a permanent magnet is fixedly connected to the middle part of the rotating shaft, an impeller is fixedly connected to the right side of the rotating shaft, a sealing ring is fixedly connected to the right side of the bearing, main water channels are opened inside the two sides of the shell, a first water channel is opened in the middle part of the shell, a second water channel is opened inside the left side of the shell, a front cover is fixedly connected to the right side of the front cover, a water inlet pipe is fixedly connected to the right side of the front cover, a water outlet pipe is fixedly connected to the upper side of the front cover, an electronic control board is fixedly connected to the left end of the shell, a heat-conducting silicone sheet is fixedly connected to the right side of the electronic control board, a rear cover is fixedly connected to the left side of the shell, a ceramic heat sink is fixedly connected to the right side of the rear cover, a heat dissipation hole is opened on the surface of the rear cover, and a base is fixedly connected to the bottom of the shell, characterized in that: One end of the rotating shaft passes through the impeller to form an extended end, and the extended end is equipped with an alarm component that can rotate with the rotating shaft. The alarm component includes an alarm shell, one end of the alarm shell is provided with a first cavity, the first cavity is provided with a switch sensor, the first cavity is sealed after the switch sensor is installed, the other end of the alarm shell is provided with at least one first water inlet, the middle part of the alarm shell is provided with an impeller accommodating cavity, the impeller accommodating cavity is provided with an alarm impeller, the alarm shell is provided with at least one first water outlet in the circumferential direction of the impeller accommodating cavity, and a water outlet channel is formed between the first water inlet and the first water outlet, the middle part of the alarm impeller is provided with an alarm impeller shaft that can drive the alarm impeller to rotate, one end of the alarm impeller shaft passes through the first cavity and is connected to a trigger that can control the on and off of the switch sensor.

2. The brushless electronic water pump according to claim 1, characterized in that: The alarm impeller is arranged in the impeller accommodating cavity and is located between the first water inlet and the first water outlet.

3. The brushless electronic water pump according to claim 2, characterized in that: A box body opened toward one end of the impeller accommodating cavity is provided in the first cavity, the trigger member is located in the box body, and a relief groove with a give-way design is provided in the box body at a position corresponding to the switch sensor. The first cavity is sealed by waterproof glue after the switch sensor is installed.

4. The brushless electronic water pump according to claim 3, characterized in that: The switch sensor comprises a switch circuit board and a Hall sensor mounted on the switch circuit board. The switch circuit board is electrically connected to the electronic control board through wires or wirelessly, and the triggering member is a magnet.

5. The brushless electronic water pump according to claim 4, characterized in that: The bottom opening of the main water channel is located at one end of the shell body close to the side of the impeller, and the upper opening of the main water channel is located at one end of the impeller body away from the alarm shell body.

6. The brushless electronic water pump according to claim 5, characterized in that: The main water channel is connected to the first water channel and the second water channel respectively. The first water channel passes through the inside of the heat dissipation silicone grease, and the second water channel contacts the thermal conductive silicone sheet. The front cover and the rear cover are fixed to the shell by screws. The ceramic heat sink is connected to the electronic control board, and the heat dissipation holes correspond to the positions of the ceramic heat sink.

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