Heat dissipation system for driving control panel of heating ventilation air conditioner and control method of heat dissipation system

Abstract

The invention relates to the technical field of heating, ventilation and air conditioning, in particular to a heating, ventilation and air conditioning drive control panel heat dissipation system and a control method thereof. A water cooling heat exchanger is connected with a water inlet pipe and a water outlet pipe, a water flow switch is arranged on the water inlet pipe, a temperature sensor is arranged on a drive control panel, and one side of the drive control panel abuts against a heat dissipation pipeline; one end of the heat dissipation pipeline is communicated with the water inlet pipe, the other end of the heat dissipation pipeline is connected with the variable frequency water pump, part of cold water in the water inlet pipe is conveyed into the heat dissipation pipeline through the variable frequency water pump to conduct heat dissipation on the IPM module of the driving control panel, the heat dissipation capacity is improved, and the performance of the system is improved; the operation frequency of the variable frequency water pump is controlled according to the real-time temperature of the IPM module, then the heat dissipation effect of the heat dissipation pipeline is adjusted, it is guaranteed that the real-time temperature of the IPM module is kept within the set target temperature range, the condensation phenomenon is prevented, the reliability is improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air conditioning, and in particular to a heating, ventilation and air conditioning drive control panel heat dissipation system and a control method thereof. Background Art

[0002] HVAC refers to the system or related equipment responsible for heating, ventilation and air conditioning indoors or in a car. The HVAC system can control the temperature and humidity of the air and improve indoor comfort. It is an important part of medium and large industrial buildings or office buildings. There are currently two main ways to dissipate heat from the drive control board of the HVAC. One is to use a heat sink for heat dissipation, and the other is to use a refrigerant for heat dissipation. However, the heat dissipation capacity of the heat sink is insufficient, which can easily cause the temperature of the drive control board to be too high. Using refrigerant for heat dissipation will sacrifice the performance of the air conditioning system. In addition, because the temperature of the refrigerant is low, condensation can easily occur on the drive control board, causing a short circuit on the circuit board or damage to electronic components, resulting in low reliability and shortened equipment life. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a HVAC drive control board heat dissipation system and a control method thereof that improves heat dissipation capacity, improves system performance, prevents condensation, improves reliability and extends equipment service life.

[0004] The technical solution adopted by the present invention is:

[0005] A heating and ventilation air conditioning drive control board heat dissipation system includes a refrigerant circulation device and a drive control board for driving and controlling the refrigerant circulation device. The refrigerant circulation device includes a variable frequency compressor, a heat exchanger, an expansion valve and a water-cooled heat exchanger which are connected in sequence through pipelines to form a closed loop. The water-cooled heat exchanger is connected to a water inlet pipe and a water outlet pipe. The water inlet pipe is provided with a water flow switch. A temperature sensor is provided on the drive control board. A heat dissipation pipe is abutted on one side of the drive control board. One end of the heat dissipation pipe is connected to the water inlet pipe, and the other end is connected to a variable frequency water pump. The water inlet end of the variable frequency water pump is connected to the water inlet pipe through a pipe.

[0006] Preferably, a four-way valve is further included, wherein four ports are provided in the four-way valve, two of which are respectively connected to the inlet and outlet of the variable frequency compressor through pipelines, and the other two ports are respectively connected to the heat exchanger and the water-cooled heat exchanger through pipelines.

[0007] Preferably, the expansion valve is an electronic expansion valve.

[0008] Preferably, the heat dissipation pipe is arranged in a circuitous shape.

[0009] Preferably, an IPM module is provided on the drive control board, and a temperature sensor detects the temperature of the IPM module.

[0010] Preferably, the IPM module includes a first integrated power module and a second integrated power module, the first integrated power module is electrically connected to the variable frequency compressor, and the second integrated power module is electrically connected to the variable frequency water pump.

[0011] Preferably, the diameter of the heat dissipation pipe ranges from 9 mm to 25.4 mm.

[0012] The present invention also provides a control method for a heat dissipation system of a HVAC driving control panel, comprising the following steps:

[0013] S1, set the minimum target temperature of the IPM module to T1, and set the maximum target temperature of the IPM module to T2;

[0014] S2, obtain the power-on signal and control the water flow switch to close;

[0015] S3. After the water flow switch is closed, the variable frequency water pump is powered on and the variable frequency compressor is started, so that the refrigerant circulates through the variable frequency compressor, the four-way valve, the heat exchanger, the expansion valve and the water-cooled heat exchanger in sequence, so that the cold water flows in the water inlet pipe and heats up after passing through the water-cooled heat exchanger, and is discharged from the water outlet pipe after heating. At the same time, part of the cold water in the water inlet pipe is transported to the heat dissipation pipeline through the variable frequency water pump to dissipate the heat of the IPM module of the drive control board;

[0016] S4, the variable frequency water pump runs at the initial frequency F0 when the variable frequency compressor is started, and at the same time the real-time temperature Ti of the IPM module in the drive control board is detected by the temperature sensor;

[0017] S5. When T1≤Ti≤T2, the variable frequency water pump is controlled to maintain the current frequency operation; when Ti<T1, the operating frequency of the variable frequency water pump is reduced; when Ti>T2, the operating frequency of the variable frequency water pump is increased;

[0018] S6. When the water flow switch is disconnected, the variable frequency water pump is controlled to stop running and return to standby state.

[0019] The beneficial effects of the present invention are:

[0020] The HVAC drive control board heat dissipation system and control method thereof transport part of the cold water in the water inlet pipe to the heat dissipation pipe through a variable frequency water pump to dissipate the heat of the IPM module of the drive control board, thereby improving the heat dissipation capacity and the performance of the system. The real-time temperature of the IPM module in the drive control board is detected by a temperature sensor, and the operating frequency of the variable frequency water pump is controlled according to the real-time temperature of the IPM module, thereby adjusting the heat dissipation effect of the heat dissipation pipe, ensuring that the real-time temperature of the IPM module is maintained within the set target temperature range, preventing condensation, improving reliability and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the heat dissipation system of the HVAC drive control panel.

[0022] Figure 2 Flow chart of a control method for a heat dissipation system of a HVAC drive control panel.

[0023] In the figure: 1. Drive control board; 2. Variable frequency compressor; 3. Heat exchanger; 4. Expansion valve; 5. Water-cooled heat exchanger; 6. Water inlet pipe; 7. Water outlet pipe; 8. Water flow switch; 9. Heat dissipation pipe; 10. Variable frequency water pump; 11. Four-way valve. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1 The present invention provides a technical solution: a heat dissipation system of a heating and ventilation air conditioning drive control board, comprising a refrigerant circulation device and a drive control board 1 for driving and controlling the refrigerant circulation device, the refrigerant circulation device comprising a variable frequency compressor 2, a heat exchanger 3, an expansion valve 4 and a water-cooled heat exchanger 5 which are sequentially connected through pipelines to form a closed loop, the water-cooled heat exchanger 5 is connected with a water inlet pipe 6 and a water outlet pipe 7, the water inlet pipe 6 is provided with a water flow switch 8, a temperature sensor is provided on the drive control board 1, a heat dissipation pipe 9 is abutted on one side of the drive control board 1, one end of the heat dissipation pipe 9 is connected with the water inlet pipe 6, and the other end is connected with a variable frequency water pump 10, and the water inlet end of the variable frequency water pump 10 is connected with the water inlet pipe 6 through a pipeline;

[0026] A portion of the cold water in the water inlet pipe 6 is transported to the heat dissipation pipe 9 through the variable frequency water pump 10, and the IPM module of the drive control board 1 is heat exchanged through the heat dissipation pipe 9 to achieve the effect of heat dissipation of the IPM module. In addition, compared with the method of heat dissipation using a heat dissipation block, the heat dissipation capacity is improved, and compared with the method of heat dissipation using a refrigerant, the performance of the system is improved. The real-time temperature of the IPM module in the drive control board 1 is detected by a temperature sensor, and the operating frequency of the variable frequency water pump 10 is controlled according to the real-time temperature feedback of the IPM module, thereby changing the water flow rate of the heat dissipation pipe 9, and then adjusting the heat dissipation effect of the heat dissipation pipe 9, ensuring that the real-time temperature of the IPM module is maintained within the set target temperature range, preventing condensation, improving reliability and extending the service life of the equipment.

[0027] In order to facilitate the switching of the flow direction of the refrigerant medium, in this embodiment, preferably, a four-way valve 11 is further included, and the four-way valve 11 has four ports, two of which are respectively connected to the inlet and outlet of the variable frequency compressor 2 through pipelines, and the other two ports are respectively connected to the heat exchanger 3 and the water-cooled heat exchanger 5 through pipelines;

[0028] The purpose is to control the switching of the flow direction of the refrigerant medium through the four-way valve 11. In the cooling mode, the refrigerant medium flows from the exhaust end of the variable frequency compressor 2 to the water-cooled heat exchanger 5 through the switching of the four-way valve 11, and then the water-cooled heat exchanger 5 cools and liquefies the refrigerant medium and enters the expansion valve 4, and then enters the heat exchanger 3 from the expansion valve 4. Finally, the low-pressure gas flowing out of the heat exchanger 3 flows to the suction end of the variable frequency compressor 2 through the four-way valve 11, and cools the outdoor air through the heat exchanger 3;

[0029] In the heating mode, the refrigerant flows from the exhaust end of the variable frequency compressor 2 to the heat exchanger 3 through the switching of the four-way valve 11, and then the heat exchanger 3 cools and liquefies the refrigerant and enters the expansion valve 4, and then enters the water-cooled heat exchanger 5 from the expansion valve 4. Finally, the low-pressure gas flowing out of the water-cooled heat exchanger 5 flows to the suction end of the variable frequency compressor 2 through the four-way valve 11, and heats the outdoor air through the heat exchanger 3.

[0030] In order to improve the regulation accuracy of the refrigerant flow rate, in this embodiment, preferably, the expansion valve 4 adopts an electronic expansion valve, so that the electronic expansion valve can accurately regulate the refrigerant flow rate through an electronic control signal.

[0031] In order to improve the heat dissipation effect, in the present embodiment, preferably, the heat dissipation pipe 9 is arranged in a circuitous shape. The purpose is to increase the contact area between the heat dissipation pipe 9 and the drive control board 1 by arranging the heat dissipation pipe 9 in a circuitous shape, increase the heat dissipation surface area of ​​the drive control board 1, make the heat dissipation of the drive control board 1 more uniform, and improve the heat dissipation effect.

[0032] In order to conveniently detect the temperature of the driving module in the driving control board 1 , in this embodiment, preferably, an IPM module is provided on the driving control board 1 , and a temperature sensor detects the temperature of the IPM module.

[0033] In order to facilitate the drive control of the variable frequency compressor 2 and the variable frequency water pump 10, in this embodiment, preferably, the IPM module includes a first integrated power module and a second integrated power module, the first integrated power module is electrically connected to the variable frequency compressor 2, and the second integrated power module is electrically connected to the variable frequency water pump 10. The purpose is to drive and control the variable frequency compressor 2 through the first integrated power module, and then control the operating frequency of the variable frequency compressor 2, and drive and control the variable frequency water pump 10 through the second integrated power module, and then control the operating frequency of the variable frequency water pump 10.

[0034] In order to facilitate the selection of water pumps, in this embodiment, preferably, the diameter range of the heat dissipation pipe 9 is 9mm-25.4mm. The purpose is to set the heat dissipation pipe 9 to be within the diameter range of 9mm-25.4mm. The size is reasonable, which is conducive to structural design and will not cause problems such as inability to assemble or insufficient space. It is also conducive to balancing the relationship between water flow and water pressure drop, which is conducive to water pump selection.

[0035] See also Figure 2 The present invention also provides a method for controlling a heat dissipation system of a heating and ventilation air conditioning drive control panel, comprising the following steps:

[0036] S1, set the minimum target temperature of the IPM module to T1, and set the maximum target temperature of the IPM module to T2;

[0037] S2, obtain the power-on signal and control the water flow switch 8 to close;

[0038] S3, after the water flow switch 8 is closed, the variable frequency water pump 10 is powered on and the variable frequency compressor 2 is started, so that the refrigerant circulates through the variable frequency compressor 2, the four-way valve 11, the heat exchanger 3, the expansion valve 4 and the water-cooled heat exchanger 5 in sequence, so that the cold water flows in the water inlet pipe 6 and heats up after heat exchange in the water-cooled heat exchanger 5, and is discharged from the water outlet pipe 7 after the temperature is increased. At the same time, part of the cold water in the water inlet pipe 6 is transported to the heat dissipation pipe 9 through the variable frequency water pump 10 to dissipate the heat of the IPM module of the drive control board 1;

[0039] S4, the variable frequency water pump 10 runs at the initial frequency F0 when the variable frequency compressor 2 is started, and at the same time, the real-time temperature Ti of the IPM module in the drive control board 1 is detected by the temperature sensor;

[0040] S5. When T1≤Ti≤T2, the variable frequency water pump 10 is controlled to maintain the current frequency operation. When Ti<T1, the operation frequency of the variable frequency water pump 10 is reduced, that is, the water flow of the heat dissipation pipe 9 is reduced, thereby reducing the heat dissipation effect of the heat dissipation pipe 9. When Ti>T2, the operation frequency of the variable frequency water pump 10 is increased, that is, the water flow of the heat dissipation pipe 9 is increased, thereby improving the heat dissipation effect of the heat dissipation pipe 9.

[0041] S6. When the water flow switch 8 is disconnected, the variable frequency water pump 10 is controlled to stop running and return to the standby state.

[0042] Finally, it should be noted that the above description is only a preferred example 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 heating and ventilation air conditioning drive control board heat dissipation system, comprising a refrigerant circulation device and a drive control board (1) for driving and controlling the refrigerant circulation device, characterized in that: The refrigerant circulation device comprises a variable frequency compressor (2), a heat exchanger (3), an expansion valve (4) and a water-cooled heat exchanger (5) which are connected in sequence through pipelines to form a closed loop. The water-cooled heat exchanger (5) is connected to a water inlet pipe (6) and a water outlet pipe (7). A water flow switch (8) is provided on the water inlet pipe (6). A temperature sensor is provided on the drive control board (1). A heat dissipation pipe (9) is abutted on one side of the drive control board (1). One end of the heat dissipation pipe (9) is connected to the water inlet pipe (6), and the other end is connected to a variable frequency water pump (10). The water inlet end of the variable frequency water pump (10) is connected to the water inlet pipe (6) through a pipeline.

2. A heat dissipation system for a HVAC drive control panel according to claim 1, characterized in that: It also includes a four-way valve (11), wherein the four-way valve (11) has four ports, two of which are respectively connected to the inlet and outlet of the variable frequency compressor (2) through pipelines, and the other two ports are respectively connected to the heat exchanger (3) and the water-cooled heat exchanger (5) through pipelines.

3. A heat dissipation system for a HVAC driving control panel according to claim 1, characterized in that: The expansion valve (4) is an electronic expansion valve.

4. A heat dissipation system for a HVAC drive control panel according to claim 1, characterized in that: The heat dissipation pipe (9) is arranged in a circuitous shape.

5. A heat dissipation system for a HVAC drive control panel according to claim 1, characterized in that: The drive control board (1) is provided with an IPM module, and the temperature sensor detects the temperature of the IPM module.

6. A heat dissipation system for a HVAC drive control panel according to claim 1, characterized in that: The IPM module comprises a first integrated power module and a second integrated power module, the first integrated power module is electrically connected to the variable frequency compressor (2), and the second integrated power module is electrically connected to the variable frequency water pump (10).

7. A heat dissipation system for a HVAC driving control panel according to claim 1, characterized in that: The diameter of the heat dissipation pipe (9) ranges from 9 mm to 25.4 mm.

8. A control method for a heat dissipation system of a HVAC drive control panel based on any one of claims 1-7, characterized in that: The following steps are involved: S1, set the minimum target temperature of the IPM module to T1, and set the maximum target temperature of the IPM module to T2; S2, obtaining a power-on signal and controlling the water flow switch (8) to close; S3, after the water flow switch (8) is closed, the variable frequency water pump (10) is powered on and the variable frequency compressor (2) is started, so that the refrigerant circulates through the variable frequency compressor (2), the four-way valve (11), the heat exchanger (3), the expansion valve (4) and the water-cooled heat exchanger (5) in sequence, so that the cold water flows in the water inlet pipe (6) and heats up after passing through the water-cooled heat exchanger (5), and is discharged from the water outlet pipe (7) after being heated. At the same time, part of the cold water in the water inlet pipe (6) is transported to the heat dissipation pipe (9) through the variable frequency water pump (10) to dissipate heat from the IPM module of the drive control board (1); S4, the variable frequency water pump (10) operates at the initial frequency F0 when the variable frequency compressor (2) is started, and at the same time, the real-time temperature Ti of the IPM module in the drive control board (1) is detected by the temperature sensor; S5. When T1≤Ti≤T2, control the variable frequency water pump (10) to maintain the current frequency operation; when Ti<T1, reduce the operating frequency of the variable frequency water pump (10); when Ti>T2, increase the operating frequency of the variable frequency water pump (10); S6. When the water flow switch (8) is disconnected, the variable frequency water pump (10) is controlled to stop running and return to the standby state.

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