Sealed electrical box and air conditioning system

Abstract

The utility model discloses a sealed electric appliance box and air conditioning system with dehumidification function. The sealed electric appliance box comprises a box body, a dehumidification device communicated with the box body, the dehumidification device comprises a dehumidification bin, an adsorbing material arranged in the dehumidification bin, an air outlet and an air inlet arranged at both ends of the box body, an air pipe communicated with the air outlet and the air inlet and penetrating through the dehumidification bin, and an air guide fan arranged on the air pipe, when the air guide fan works, the air in the box body circulates between the dehumidification bin and the box body. The utility model can effectively control the air humidity in the electric appliance box, keep the internal environment dry, and prevent the damage of the mainboard and electric components caused by condensation.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a sealed electrical box with dehumidification function and an air conditioning system using the sealed electrical box. Background Technology

[0002] In air conditioning systems, the mainboard and drive boards used to control components such as the compressor are usually housed in an electrical box. Since these electrical components can be damaged by humid air or condensation, several solutions have been developed to address this issue. The most prominent of these is the use of a fully enclosed electrical box. However, fully enclosed electrical boxes are susceptible to damage due to manufacturing processes, assembly, and aging, which can lead to poor sealing and allow humid air to enter the box, causing damage to the mainboard.

[0003] On the other hand, during the operation of the air conditioning system, the mainboard, driver board, and other components generate heat. This heat accumulates in the electrical box, causing its temperature to rise continuously. When the temperature exceeds a certain range, it can damage the mainboard, driver board, and other components. Therefore, heat dissipation of the electrical box is necessary. Currently, a common heat dissipation method is to install a heat dissipation device on the back of the electrical box. A portion of the liquid refrigerant introduced into the air conditioning system passes through this device to dissipate heat from the electrical box. For example, the IPM heat dissipation device is a type of radiator used to dissipate heat from the high-power mainboard (mainly referring to the compressor driver board) inside the electrical box. A portion of the liquid refrigerant in the air conditioning system flows through the radiator, which uses arc-shaped pipes to increase the heat exchange contact area and enhance heat exchange. However, this method also has limitations. For instance, when the heat generated by the mainboard or driver board inside the electrical box is less than the heat dissipation of the refrigerant, the air temperature inside the electrical box may be lower than the dew point temperature, resulting in condensation. This condensation can cause a short circuit in the mainboard or driver board. It is not uncommon for condensation inside the electrical box to damage the control board during the operation of air conditioning systems.

[0004] Therefore, it is essential to design a new technology that can completely solve the problem of air condensation inside the electrical box causing damage to the motherboard. Utility Model Content

[0005] This utility model proposes a sealed electrical box and air conditioning system with dehumidification function to solve the technical problem of damage to electrical components such as motherboards caused by humid air or air condensation.

[0006] This utility model proposes a sealed electrical box, including a box body and a dehumidification device communicating with the box body. The dehumidification device includes a dehumidification chamber, an adsorbent material disposed in the dehumidification chamber, an air outlet and an air inlet disposed at both ends of the box body, an air duct connecting the air outlet and the air inlet and passing through the dehumidification chamber, and an exhaust fan disposed on the air duct. When the exhaust fan is working, the air inside the box body circulates between the dehumidification chamber and the box body.

[0007] Preferably, the adsorbent material is activated carbon or molecular sieve.

[0008] Furthermore, the box is equipped with a temperature sensor and a humidity sensor.

[0009] Furthermore, the dehumidification device also includes a heating tube passing through the dehumidification chamber for the regeneration of the adsorbent material.

[0010] Furthermore, a heat dissipation device is provided on one side of the sealed electrical box.

[0011] Preferably, the radiator device is an arc-shaped tube radiator, with both ends connected to refrigerant pipes.

[0012] This utility model also proposes an air conditioning system, including a compressor, an outdoor heat exchanger, a first electronic expansion valve, an indoor unit, and the aforementioned sealed electrical box. One end of the heat dissipation device in the sealed electrical box is connected to the refrigeration outlet pipe of the first electronic expansion valve, and the other end is connected to the refrigeration inlet pipe of the indoor unit. The heating pipe inlet in the sealed electrical box is connected to the exhaust pipe of the compressor through a second electronic expansion valve, and the heating pipe outlet is connected to the low-pressure pipe of the air conditioning system through a one-way valve.

[0013] Furthermore, a subcooler is provided between the sealed electrical box and the indoor unit. A branch line is led out from the refrigeration inlet pipe of the indoor unit and connected to the low-pressure pipe of the air conditioning system. A third electronic expansion valve is provided on the branch line. After being throttled by the branch line, part of the refrigerant enters the subcooler to subcool the refrigerant in the main line.

[0014] When the dehumidifier is working, the exhaust fan is turned on to introduce the air from the sealed electrical box into the dehumidification chamber. The dehumidified air is then returned to the sealed electrical box until the air temperature inside the sealed electrical box is higher than the dew point temperature.

[0015] In cooling mode, when the defrosting temperature of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated and the system enters dehumidification mode.

[0016] In heating mode, when the suction side pressure of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated and the system enters dehumidification mode.

[0017] Furthermore, the dehumidification control method also includes a dehumidification device heating and regeneration mode: when the cumulative running time NC of the dehumidification device is greater than the first set time A, the heating and regeneration mode is started. At this time, the second electronic expansion valve is opened and the induced draft fan is turned off. The heating and regeneration mode ends after the running time reaches the second set time B, and the second electronic expansion valve is turned off.

[0018] Preferably, the second set time B is 10 minutes.

[0019] Compared with the prior art, the technical solution proposed in this utility model has the following advantages:

[0020] 1. This utility model effectively controls the air humidity inside the electrical box, keeps the internal environment dry, and prevents damage to the motherboard and electrical components caused by condensation.

[0021] 2. This utility model can achieve dehumidification without reducing the compressor frequency, completely solving the condensation problem, and will not affect indoor comfort.

[0022] 3. The dehumidification and adsorption material regeneration control method for the sealed electrical box proposed in this utility model enables the dehumidification device to start when there is a potential risk of condensation inside the electrical box; when the adsorption material is close to saturation in terms of moisture absorption, regeneration is achieved by high-temperature and high-pressure gas discharged from the compressor; the control is simple, convenient, efficient and low cost.

[0023] 4. The dew point temperature TL calculation formula and boundary conditions (the value restrictions of T and Φ) proposed in this utility model reflect the refined design for actual application scenarios. Attached Figure Description

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the sealed electrical box proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the back of the sealed electrical box;

[0027] Figure 3 This is a schematic diagram of an air conditioning system equipped with the sealed electrical box of this utility model;

[0028] Figure 4 This is the control flowchart for dehumidification inside the sealed electrical box;

[0029] Figure 5 This is the control flow diagram for the heating and regeneration of the dehumidification device.

[0030] in:

[0031] 1. Box body, 2. Heat dissipation device, 3. Dehumidification chamber, 4. Air outlet, 5. Air inlet, 6. Air duct, 7. Exhaust fan, 8. Refrigerant pipe, 9. Heating pipe, 10. Compressor, 11. Oil separator, 12. Four-way valve, 13. Outdoor heat exchanger, 14. First electronic expansion valve, 15. Sealed electrical box, 16. Subcooler, 17. Indoor unit, 18. Vapor separator, 19. Second electronic expansion valve, 20. One-way valve, 21. Branch circuit, 22. Third electronic expansion valve, 23. Temperature sensor, 24. Humidity sensor.

[0032] t dry bulb temperature;

[0033] Φ Wet-bulb temperature;

[0034] PL intake side pressure value;

[0035] Defrosting temperature of Tf air conditioning unit;

[0036] The cumulative operating time of the NC dehumidifier in defrost mode, in hours;

[0037] TL electrical box internal air dew point temperature;

[0038] A. First set time;

[0039] B. Second set time. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0041] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of protection of the invention.

[0042] While techniques, methods, and devices known to those skilled in the art are not discussed in detail herein, such techniques, methods, and devices should be considered part of this specification where appropriate. Any specific values ​​in this specification should be interpreted as merely exemplary and not as limiting the scope of this invention.

[0043] For ease of description, the terms used in the specification to describe position, such as "above", "to the left of", "in front of", etc., are only used to describe the spatial positional relationship between a certain component and other components in the embodiment shown in the figure. When the position of the component is different, the relative position will change. Therefore, the positional relationship of the embodiment in the figure should not constitute a limitation on the present invention.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" in the specification is merely for distinguishing similar components and does not imply any order of precedence. Therefore, it should not be construed as limiting the scope of protection of this utility model.

[0045] The concept of this utility model is to design a small dehumidifier that works in conjunction with a sealed electrical appliance box. The dehumidifier contains an absorbent material that can absorb moisture. The dehumidifier and the electrical appliance box are connected via a flexible duct or similar material. An exhaust fan draws air from inside the sealed electrical appliance box into the dehumidifier, dehumidifies it, and then returns it to the sealed electrical appliance box. This process circulates the air between the dehumidifier and the electrical appliance box until the air temperature inside the electrical appliance box exceeds its dew point temperature, thus completely eliminating the damage caused by air humidity and condensation to the motherboard and electrical components.

[0046] The sealed electrical box proposed in this utility model effectively solves the problem of condensation inside the electrical box due to loss of its function of blocking humid air after poor sealing.

[0047] In addition, this invention connects the dehumidification device to the refrigerant system of the air conditioning system. By allowing high-temperature gas to flow through the dehumidification device, the adsorption material in the dehumidification device is regenerated, thereby extending the service life of the adsorption material and reducing costs.

[0048] Figure 1 This is a schematic diagram of the sealed electrical box proposed in this utility model. The sealed electrical box proposed in this utility model includes: a box body 1, which houses electrical components such as a motherboard and a driver board; a heat dissipation device 2, installed close to one side of the sealed box for heat dissipation; and a dehumidification device connected to the box body. The dehumidification device includes a dehumidification chamber 3 filled with adsorbent material, preferably activated carbon or molecular sieve; an air outlet 4 and an air inlet 5 respectively located at the upper and lower ends of the box body; an air duct 6 connecting the air outlet and the air inlet and passing through the dehumidification chamber, preferably a flexible air duct; and an exhaust fan 7 installed on the air duct. When the exhaust fan is working, the air inside the box is returned to the box body 1 by the exhaust fan through the air outlet 4, air duct 6, dehumidification chamber 3, air duct 6, and air inlet 5. Through air circulation between the dehumidification chamber 3 and the box body 1, the air inside the box loses moisture under the action of the adsorbent material in the dehumidification chamber, eliminating the risk of condensation.

[0049] Heat dissipation device 2 is preferably an arc-shaped tube radiator (such as...) Figure 2 As shown, this arc-shaped tube radiator can increase the heat exchange contact area and enhance heat exchange, making it particularly suitable for cooling high-power motherboards inside the electrical box. The heat dissipation device 2 introduces liquid refrigerant from the air conditioning system through refrigerant pipe 8. The liquid refrigerant flows through the radiator to cool the electrical box and then returns to the air conditioning system.

[0050] The adsorbent material filling the dehumidification chamber can be activated carbon or molecular sieves, which are regenerable and reusable. For example... Figure 1As shown, the dehumidification device also includes a heating pipe 9 that passes through the dehumidification chamber 3 for regenerating the adsorbent material. During operation, a portion of high-temperature, high-pressure gaseous refrigerant is introduced from the exhaust pipe of the air conditioning system through the heating pipe to heat and regenerate the adsorbent material in the dehumidification chamber.

[0051] This invention innovates on the structure of the electrical box, proposing a combined design of "electrical box + small dehumidifier + flexible duct circulation system". It uses adsorption materials to absorb moisture and utilizes the high-temperature gas from the air conditioning refrigerant system to regenerate the dehumidifier. This structure integrates physical adsorption and thermal regeneration technologies, breaking through the traditional approach of simple, single-enclosed dehumidification.

[0052] The air conditioning system is equipped with the sealed electrical box and dehumidification device proposed in this utility model. The box body 1 and the dehumidification chamber 3 are connected through the air duct 6. A portion of the high-temperature and high-pressure refrigerant gas discharged from the compressor is introduced from the air conditioning system through the heating pipe 9. The high-pressure refrigerant gas passes through the dehumidification chamber to heat and regenerate the adsorbent material. After the refrigerant in the heating pipe exchanges heat with the adsorbent material, it returns to the air conditioning system.

[0053] The sealed electrical box proposed in this invention effectively solves the problem of damage to the mainboard caused by moisture condensation on the surface of the control board in humid air.

[0054] Figure 3 This is a schematic diagram of an air conditioning system equipped with the sealed electrical box of this utility model. The air conditioning system includes a compressor 10, an oil separator 11, a four-way valve 12, an outdoor heat exchanger 13, a first electronic expansion valve 14, a sealed electrical box 15, an indoor unit 17, and a vapor separator 18, all connected by pipes. A subcooler is also provided between the sealed electrical box 15 and the indoor unit 17. A branch line 21, connected to the low-pressure pipe of the air conditioning system, is led out from the refrigerant inlet pipe of the indoor unit. A third electronic expansion valve 22 is provided on this branch line. Part of the refrigerant is throttled by the third electronic expansion valve 22 on the branch line and then enters the subcooler 16 to subcool the refrigerant in the main line.

[0055] One end of the heat dissipation device 2 in the sealed electrical box is connected to the refrigeration outlet pipe of the first electronic expansion valve 14, and the other end is connected to the outlet of the branch 21. The high-temperature and high-pressure gas discharged from the compressor 10 is condensed by the outdoor heat exchanger 13 and becomes a high-pressure, room-temperature liquid. Then, after being throttled by the first electronic expansion valve 14, it becomes a low-pressure, low-temperature liquid. At this time, it enters the heat dissipation device 2 of the sealed electrical box to cool down the mainboard and other electrical components inside the box 1, ensuring that these electrical components operate within the normal temperature range.

[0056] The inlet of the heating tube 9 in the sealed electrical box is connected to the exhaust pipe of the compressor through the second electronic expansion valve 19, and the outlet of the heating tube is connected to the steam separator 18 through the one-way valve 20. When the second electronic expansion valve is opened, a portion of the compressor exhaust is introduced to heat and regenerate the adsorbent material in the dehumidification chamber, so that the adsorbent material can be recycled and maintain a stable water absorption effect.

[0057] The box 1 is equipped with a temperature sensor 23 and a humidity sensor 24.

[0058] The sealing electrical box proposed in this utility model includes the following aspects in terms of dehumidification control: real-time detection of temperature and humidity inside the sealing electrical box, and calculation of the dew point temperature of the air inside the sealing electrical box; and activation of the dehumidification device based on the comparison results of defrosting of the air conditioning unit and dew point temperature, or the comparison results of low-pressure side pressure and dew point temperature of the air conditioning system.

[0059] When the dehumidifier is working, the exhaust fan 7 is turned on, and the air in the sealed electrical box is introduced into the dehumidification chamber 3 through the air duct 6 for dehumidification. The dehumidified air is then returned to the sealed electrical box through the air duct 6 until the air temperature in the sealed electrical box is higher than the dew point temperature.

[0060] This invention innovates in its control method: it designs a dynamic control logic for dehumidification and adsorption material regeneration, including:

[0061] Real-time monitoring and triggering: The dew point temperature (TL) is calculated by the temperature and humidity sensor, and dehumidification is intelligently started in cooling / heating mode based on the comparison of Tf, PL and TL.

[0062] Adsorbent material regeneration control: The adsorbent material is regenerated using the high temperature of the compressor exhaust, and the regeneration cycle is automatically triggered by the cumulative running time (NC).

[0063] Technological synergy: By linking the air conditioning refrigerant system with the electrical box dehumidification system, energy recycling (such as using waste heat regeneration) is achieved, improving overall energy efficiency.

[0064] The electrical box proposed in this utility model includes a dehumidification mode and a dehumidification device heating and regeneration mode in terms of dehumidification control.

[0065] Figure 4 This is the control flowchart for dehumidification inside the sealed electrical box. In cooling mode, when the defrosting temperature of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated, and the system enters dehumidification mode. In heating mode, when the low-pressure side pressure of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated, and the system enters dehumidification mode.

[0066] I. Dehumidification Mode

[0067] The dehumidification device will only detect and determine whether to activate when the air conditioning unit is running. Dehumidification will not start when the unit is off.

[0068] When the air conditioning unit is running, the temperature sensor 23 and humidity sensor 24 built into the sealed electrical box detect the dry bulb temperature t and wet bulb temperature Φ inside the box in real time, and calculate the dew point temperature TL of the air inside the electrical box in real time based on the detected parameters.

[0069] The dew point temperature TL of the air inside the electrical box is calculated using the following formula:

[0070] TL=-35.957-1.8726*(lnΦ+C8 / T+C9+C20*T+C21*T 2 +C22*T 3 +

[0071] C23*lnT)+1.1689*(lnΦ+C8 / T+C9+C20*T+C21*T 2 +C22*T 3 +C23*lnT) 2 ;

[0072] in:

[0073] T = t + 273.15, refers to the dry-bulb temperature of the air inside the electrical box, which is detected by temperature sensor 23; the value of t is in the range of [10℃, 40℃], and the value is taken according to the boundary value when it exceeds the boundary value;

[0074] Φ is the wet-bulb temperature (%) of the air inside the electrical box, detected by a humidity sensor 24; the value range of Φ is [20%, 90%], and the value is taken according to the boundary value when it exceeds the boundary value;

[0075] C8 = -5800.2206

[0076] C9 = 1.3914993

[0077] C20 = -0.04860239

[0078] C21 = 0.41764768 × 10 -4

[0079] C22 = -0.14452093 × 10 -7

[0080] C23 = 6.5459673

[0081] The above formula for calculating the dew point temperature TL was derived from experiments, where parameters C8, C9, C20, C21, C22, and C23 are experimental fitting data.

[0082] The range of the dew point temperature TL inside the electrical box is [5, 24]. If the calculated value of TL exceeds the boundary value, the boundary value shall be used.

[0083] In practical applications, the formula for calculating the dew point temperature inside the electrical box is pre-programmed and set in the control chip. During calculation, only the dry-bulb and wet-bulb temperatures need to be input for a quick result. Taking a dry-bulb temperature t = 27℃ and a wet-bulb temperature φ = 65% inside the electrical box as an example, substituting these values ​​into the formula yields a dew point temperature of approximately 19.86℃. This dew point temperature TL falls within the range [5, 24], therefore the actual calculated value is used as the basis for judgment.

[0084] 1.1 Cooling Mode

[0085] During the operation of the air conditioning unit, the temperature and humidity inside the sealed electrical box are monitored in real time, and the dew point temperature TL inside the box is calculated.

[0086] When the defrosting temperature Tf in the unit's cooling mode is lower than the dew point temperature TL of the air inside the electrical box, there is a risk of condensation. In this case, the dehumidification device needs to be activated to enter dehumidification mode. At this time, the exhaust fan 7 is turned on, and the air inside the box 1 is introduced into the dehumidification chamber 3 through the air outlet 4 and the air duct 6 for dehumidification. The dehumidified air then returns to the inside of the box 1 through the air duct 6 and the air inlet 5. This cycle continues until the humidity inside the box 1 is reduced below the risk level of condensation.

[0087] 1.2 Heating Mode

[0088] When the low-pressure side pressure PL of the air conditioning unit is lower than the dew point temperature TL in heating mode, there is a risk of condensation or icing. In this case, the dehumidification device needs to be activated to enter dehumidification mode. At this time, the induced draft fan 7 is turned on, and the air in the housing 1 is introduced into the dehumidification chamber through the air duct 6 for dehumidification. The dehumidified air then returns to the housing through the air duct 6 and the air inlet 5. This cycle continues until the humidity in the electrical box is reduced below the risk level of condensation.

[0089] When the outdoor temperature is below -15℃, dehumidification is unnecessary because there is virtually no water vapor in the air at this low temperature.

[0090] II. Dehumidification device heating regeneration mode

[0091] After prolonged operation, the adsorbent material inside the dehumidification chamber of a dehumidifier can easily become saturated with water. At this point, it is necessary to regenerate the adsorbent material through heating. Heating regeneration can be achieved by using a compressor to discharge air at high temperature and pressure.

[0092] After the dehumidifier has accumulated NC hours of operation, a heating regeneration operation is initiated. During this time, the second electronic expansion valve 19 is opened, allowing some compressor exhaust to enter the dehumidifier chamber and heat the adsorbent material. Heating continues for a second set time B, after which the valve is closed. The empirical value for the second set time B is 10 minutes. When the heating time is up, the second electronic expansion valve 19 is closed, completing the heating regeneration operation. At this point, the accumulated operating time NC of the dehumidifier is reset to zero.

[0093] During the heating and regeneration process, the dehumidification device's exhaust fan 7 must be kept off; otherwise, heat will be introduced into the box, causing overheating and damage to internal electrical components such as the main board.

[0094] Figure 5 This is the control flowchart for the heating and regeneration of the dehumidifier. When the cumulative running time NC of the dehumidifier is greater than the first set time A, the heating and regeneration mode is started. At this time, the second electronic expansion valve 19 is opened, the induced draft fan 7 is turned off, and the compressor exhaust is introduced into the dehumidifier chamber to heat the adsorbent material. The heating and regeneration mode ends after the running time reaches the second set time B, and the second electronic expansion valve is closed.

[0095] The utility model proposes a sealed electrical box with a small dehumidification device, which effectively protects the electrical components such as the motherboard inside the box from moisture or condensation damage, ensuring their normal operation.

[0096] The sealed electrical box proposed in this invention, combined with a small dehumidifier, can be used in an air conditioning system. This not only allows for heat dissipation from the electrical box using a low-temperature refrigerant, but also for dehumidifying the air inside the electrical box using a medium-temperature refrigerant, thus ensuring the safety of the electrical appliances.

[0097] The sealed electrical box proposed in this invention, when paired with a small dehumidifier, can also heat and regenerate the adsorbent material in the dehumidifier, thereby stabilizing the adsorption effect and reducing the cost of use.

[0098] The above description is merely a specific embodiment of this utility model. It should be noted that any modifications, equivalent substitutions, and variations made within the spirit and framework of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealed electrical box comprising a box body, characterized in that, It also includes a dehumidification device connected to the box body. The dehumidification device includes a dehumidification chamber, an adsorbent material disposed in the dehumidification chamber, an air outlet and an air inlet disposed at both ends of the box body, an air duct connecting the air outlet and the air inlet and passing through the dehumidification chamber, and an exhaust fan disposed on the air duct. When the exhaust fan is working, the air inside the box body circulates between the dehumidification chamber and the box body.

2. The sealed electrical box of claim 1, wherein, The adsorption material is activated carbon or molecular sieve.

3. The sealed electrical box of claim 1, wherein, The box contains a temperature sensor and a humidity sensor.

4. The sealed electrical box of claim 1, wherein, The dehumidification device also includes a heating tube passing through the dehumidification chamber for the regeneration of the adsorption material.

5. The sealed electrical box of claim 1, wherein, A heat dissipation device is provided on one side of the sealed electrical box.

6. The sealed electrical box of claim 5, wherein, The heat dissipation device adopts an arc-shaped tube radiator, with both ends connected to the refrigerant pipe.

7. An air conditioning system comprising a compressor, an outdoor heat exchanger, a first electronic expansion valve, and an indoor unit, characterized by, It also includes the sealed electrical box as described in any one of claims 1-6, wherein one end of the heat dissipation device in the sealed electrical box is connected to the refrigeration outlet pipe of the first electronic expansion valve, and the other end is connected to the refrigeration inlet pipe of the indoor unit; the heating pipe inlet in the sealed electrical box is connected to the exhaust pipe of the compressor through the second electronic expansion valve, and the heating pipe outlet is connected to the vapor separator of the air conditioning system through a one-way valve.

8. The air conditioning system of claim 7, wherein, A subcooler is also provided between the sealed electrical box and the indoor unit. A branch line is led out from the refrigeration inlet pipe of the indoor unit and connected to the low-pressure gas pipe of the air conditioning system. A third electronic expansion valve is provided on the branch line. After being throttled by the branch line, part of the refrigerant enters the subcooler to subcool the refrigerant in the main line.

9. The air conditioning system as described in claim 7, characterized in that, When the dehumidifier is working, the exhaust fan is turned on to introduce the air from the sealed electrical box into the dehumidification chamber. The dehumidified air is then returned to the sealed electrical box until the air temperature inside the sealed electrical box is higher than the dew point temperature.

10. The air conditioning system of claim 7, wherein, In cooling mode, when the defrosting temperature of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated and the system enters dehumidification mode.

11. The air conditioning system of claim 7, wherein, In heating mode, when the suction side pressure of the air conditioning system is lower than the dew point temperature inside the sealed electrical box, the dehumidification device is activated and the system enters dehumidification mode.

12. The air conditioning system of claim 7, wherein, It also includes a dehumidifier heating and regeneration mode: when the cumulative running time NC of the dehumidifier is greater than the first set time A, the heating and regeneration mode is started. At this time, the second electronic expansion valve is opened and the induced draft fan is turned off. The heating and regeneration mode runs for a second set time B and then ends, and the second electronic expansion valve is turned off.

13. The air conditioning system of claim 12, wherein, The second set time T is 10 minutes.

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