Anti-icing automatic defrosting system of heating ventilation air conditioner heat pump unit

Abstract

The anti-icing automatic defrosting system comprises an evaporator, an expansion valve, a drying bottle, a compressor, a condenser, a heat storage device, an electromagnetic four-way valve, an air outlet and an electric controller, and the evaporator, the expansion valve, the drying bottle, the compressor, the condenser, the heat storage device and the electromagnetic four-way valve are connected through pipelines. The inner walls of the two opposite sides of the heat storage device are connected with a first air inlet pipe, a second air inlet pipe and a heat exchange pipe correspondingly, the first air inlet pipe is connected with the air outlet, an air pump is installed on the first air inlet pipe, and the second air inlet pipe communicates with a pipeline between the compressor and the evaporator. Part of the outer wall of the heat exchange pipe is sequentially attached to the evaporator, the pipeline between the evaporator and the condenser and the outer wall of the condenser. The anti-icing automatic defrosting system of the heating ventilation air conditioner heat pump unit has the effects that the heat loss in a room can be reduced, and defrosting of multiple parts in an air conditioner can be synchronously achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heating and ventilation, and in particular to an anti-icing automatic defrosting system for a heating and ventilation air conditioning heat pump unit. Background Art

[0002] The HVAC heat pump unit is a device that can provide both cooling and heating. It absorbs heat from the air through the reverse Carnot cycle principle, raises it to a higher temperature, and then transfers the heat to the room through the circulation system, achieving the functions of heating in winter and cooling in summer.

[0003] Generally, when a HVAC heat pump is used, if the unit is operated in a low-temperature environment, the surface temperature of the evaporator is lower than the dew point temperature of the ambient air, which directly causes water vapor to condense into frost, affecting the normal use of the air conditioner. Some air conditioners on the market have automatic defrosting effects, but most of them defrost by directly extracting indoor heating air. Therefore, during the defrosting process, the indoor temperature will drop rapidly, reducing comfort. Summary of the invention

[0004] The invention discloses an anti-icing automatic defrosting system for a HVAC heat pump unit, aiming to solve the technical problem that the automatic defrosting effect of existing air conditioners is mostly achieved by directly extracting indoor warm air to perform defrosting, which directly leads to a rapid drop in indoor temperature and reduced comfort during the defrosting process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An anti-icing automatic defrost system for a HVAC heat pump unit comprises an evaporator, an expansion valve, a drying bottle, a compressor, a condenser, a heat storage device, an electromagnetic four-way valve, an air outlet and an electric control, wherein the evaporator, the expansion valve, the drying bottle, the compressor, the condenser, the heat storage device and the electromagnetic four-way valve are mutually connected by a pipeline, and the inner walls on opposite sides of the heat storage device are respectively connected to a first air inlet pipe, a second air inlet pipe and a heat exchange pipe, the first air inlet pipe is connected to the air outlet, and an air pump is installed on the first air inlet pipe, the second air inlet pipe is connected to a pipeline between the compressor and the evaporator, and a part of the outer wall of the heat exchange pipe is sequentially attached to the evaporator, the pipeline between the evaporator and the condenser, and the outer wall of the condenser.

[0007] By providing a heat storage device and a heat exchange tube, and through the provision of a first air inlet pipe and a second air inlet pipe, air can be drawn into the heat storage device for heating, and then the heat exchange tubes are attached to the surfaces of multiple structures to achieve the defrosting effect of multiple structures. Under this defrosting structure, compared with the method of directly extracting warm air from the room for reuse, this method can reduce the loss of warm air, and limit the flow range of air through the heat exchange tubes, reduce the amount of air required for defrosting, and achieve the defrosting effect of multiple parts at the same time.

[0008] In a preferred solution, an electronic thermometer is provided on one side of the evaporator, and the measuring end of the electronic thermometer is attached to the outer wall of the evaporator, the middle inner wall of the heat exchange tube is provided with a second exhaust port, and the end inner wall of the heat exchange tube is provided with a first exhaust port;

[0009] The second exhaust port is connected to a first air valve, the middle section of the heat exchange tube is provided with a second air valve, and the second air valve is located behind the second exhaust port;

[0010] The second air inlet pipe is provided with a third air valve, and the third air valve is connected to the second air inlet pipe and the pipe connection between the compressor and the evaporator. The electric control is equipped with a temperature monitoring system, and the temperature monitoring system is simultaneously connected to the motor thermometer, the first air valve, the second air valve, the third air valve and the heat storage device;

[0011] The temperature monitoring system includes a temperature monitoring module, a value recognition module, a temperature partition module and a control module. The temperature monitoring module is connected to an electronic thermometer and is used to obtain the measurement results of the electronic thermometer and record and upload them.

[0012] The temperature partition module is used to set the values ​​of different partitions, the value recognition module is used to identify the monitoring results obtained by the temperature monitoring module, determine and match them to different temperature zones, and the control module is used to automatically control the first gas valve, the second gas valve, the third gas valve and the heat storage device according to the recognition results of the value recognition module;

[0013] The temperature zoning module is specifically used to set the temperature values ​​of the medium temperature zone, the low temperature zone, and the ultra-low temperature zone, wherein the temperature of the medium temperature zone is set at 5°C-0°C, the temperature of the low temperature zone is set at 0°C--2°C, and the temperature of the ultra-low temperature zone is set below -2°C.

[0014] By setting up a temperature monitoring system, in the temperature monitoring system, the measurement result of the electronic thermometer is monitored by the temperature monitoring module, and the temperature zone of the temperature is identified by the value recognition module. That is, the required defrost mode can be adjusted by the control module. Since the evaporator is the component most prone to frost, the degree of frost inside the air conditioner can be determined according to the partition by directly monitoring its surface temperature. In this way, the defrost state can be adjusted according to different temperature environments, which can save defrost costs to a certain extent.

[0015] In a preferred embodiment, the heat storage device includes a support bin, and the inner center of the support bin is connected to the heat storage bin, the top inner wall of the support bin is installed with an electric heating plate, and the inner walls on both sides of the support bin are respectively provided with a first air inlet, a second air inlet and an air outlet;

[0016] A heat exchange channel is arranged inside the heat storage bin, and the input end of the heat exchange channel is respectively connected to the first air inlet and the second air inlet, the output end of the heat exchange channel is connected to an extension pipe, and the extension pipe is connected to the air outlet, and the heat storage bin is filled with phase change heat storage material.

[0017] By providing a heat storage device, the heat conduction through the heat exchange flow channel in the heat storage device can make the internal phase change heat storage material absorb the heating temperature and store it, and can save the residual heat after the electric heating plate is turned on and the heat absorbed by the heating, so that the internal temperature of the entire heat storage bin can be maintained in a relatively warm constant temperature state. Therefore, when the cool air extracted by the compressor enters the heat storage device and mixes with the heating, the mixed air can be heated after passing through the heat exchange flow channel again so that it can meet the defrosting temperature within the medium temperature range. Under this structure, the extracted heating temperature can be fully utilized to reduce the heating electricity expenditure of the electric heating plate and reduce the cost of using air conditioners.

[0018] As can be seen from the above, an anti-icing automatic defrosting system for a HVAC heat pump unit includes an evaporator, an expansion valve, a drying bottle, a compressor, a condenser, a heat storage, an electromagnetic four-way valve, an air outlet and an electric control, wherein the evaporator, the expansion valve, the drying bottle, the compressor, the condenser, the heat storage and the electromagnetic four-way valve are connected to each other through pipes, and the inner walls on opposite sides of the heat storage are respectively connected with a first air inlet pipe, a second air inlet pipe and a heat exchange pipe, the first air inlet pipe is connected to the air outlet, and an air pump is installed on the first air inlet pipe, the second air inlet pipe is connected to the pipe between the compressor and the evaporator, and part of the outer wall of the heat exchange pipe is sequentially attached to the evaporator, the pipe between the evaporator and the condenser, and the outer wall of the condenser. The anti-icing automatic defrosting system for a HVAC heat pump unit provided by the present invention has the technical effect of reducing the heat loss in the room and simultaneously realizing the defrosting of multiple parts inside the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an anti-icing and automatic defrosting system for a HVAC heat pump unit proposed by the present invention.

[0020] Figure 2 This is a structural schematic diagram of a temperature monitoring system for an anti-icing and automatic defrosting system of a HVAC heat pump unit proposed by the present invention.

[0021] Figure 3 The invention provides an anti-icing automatic defrosting system for a heating, ventilation and air conditioning heat pump unit. Figure 1 Enlarged view of position A in the middle.

[0022] Figure 4 This is a schematic diagram of the heat storage structure of an anti-icing and automatic defrosting system for a HVAC heat pump unit proposed by the present invention.

[0023] Figure 5A schematic diagram of the internal structure of a heat storage device of an anti-icing and automatic defrosting system of a HVAC heat pump unit proposed by the present invention.

[0024] Figure 6 This is a top cross-sectional view of a heat storage bin of an anti-icing and automatic defrosting system for a HVAC heat pump unit proposed by the present invention.

[0025] In the figure: 1, evaporator; 2, first exhaust port; 3, second exhaust port; 4, expansion valve; 5, first air valve; 6, second air valve; 7, electronic thermometer; 8, drying bottle; 9, compressor; 10, condenser; 11, air outlet; 12, first air inlet pipe; 13, heat storage device; 14, second air inlet pipe; 15, electromagnetic four-way valve; 16, third air valve; 17, electronic control; 18, heat exchange tube;

[0026] 1301. Support bin; 1302. First air inlet; 1303. Second air inlet; 1304. Electric heating plate; 1305. Air outlet; 1306. Heat storage bin; 1307. Heat exchange channel; 1308. Phase change heat storage material; 1309. Extension tube. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] The invention discloses an anti-icing automatic defrosting system for a HVAC heat pump unit, which is mainly used in the scenario of air conditioning defrosting.

[0029] Reference Figure 1, an anti-icing automatic defrosting system for a HVAC heat pump unit, comprising an evaporator 1, an expansion valve 4, a drying bottle 8, a compressor 9, a condenser 10, a heat storage 13, an electromagnetic four-way valve 15, an air outlet 11 and an electric control 17, the evaporator 1, the expansion valve 4, the drying bottle 8, the compressor 9, the condenser 10, the heat storage 13 and the electromagnetic four-way valve 15 are connected to each other through pipelines, the inner walls on opposite sides of the heat storage 13 are respectively connected with a first air inlet pipe 12, a second air inlet pipe 14 and a heat exchange pipe 18, the first air inlet pipe 12 is connected to the air outlet 11, and an air pump is installed on the first air inlet pipe 12, the second air inlet pipe 14 is connected to the pipeline between the compressor 15 and the evaporator 1, and part of the outer wall of the heat exchange pipe 18 is sequentially attached to the evaporator 1, the evaporator 1 and the condenser 10 Through the arrangement of the first air inlet pipe 12 and the second air inlet pipe 14, warm air can be drawn from the air outlet 11 and mixed with the air drawn by the compressor 9 which is diverted from the second air inlet pipe 14. After entering the heat storage 13 for heating, the heat exchange tube 18 is attached to the surface of the evaporator 1, the condenser 10 and the corresponding structure to achieve the defrosting effect of multiple structures. Under this defrosting structure, the warm air is directly diverted from the air outlet 11 to make full use of the warm air. Compared with the method of directly drawing warm air from the room for reuse, this method can reduce the loss of warm air. The heat exchange tube 18 is used to limit the flow range of the air, reduce the amount of air required for defrosting, and achieve the defrosting effect of multiple parts at the same time.

[0030] Reference Figure 1 In a preferred embodiment, an electronic thermometer 7 is provided on one side of the evaporator 1, and the measuring end of the electronic thermometer 7 is attached to the outer wall of the evaporator 1, a second exhaust port 3 is provided on the inner wall of the middle section of the heat exchange tube 18, and a first exhaust port 2 is provided on the inner wall of the end section of the heat exchange tube 18.

[0031] Reference Figure 1 In a preferred embodiment, the second exhaust port 3 is connected to a first air valve 5 , a second air valve 6 is provided in the middle section of the heat exchange tube 18 , and the second air valve 6 is located behind the second exhaust port 3 .

[0032] Reference Figure 1 In a preferred embodiment, a third air valve 16 is provided on the second air intake pipe 14, and the third air valve 16 is connected to the second air intake pipe 14 and the pipe connection between the compressor 15 and the evaporator 1. The electronic control 17 is installed with a temperature monitoring system, and the temperature monitoring system is simultaneously connected to the motor thermometer 7, the first air valve 5, the second air valve 6, the third air valve 16 and the heat storage device 13.

[0033] Reference Figure 2In a preferred embodiment, the temperature monitoring system includes a temperature monitoring module, a value recognition module, a temperature partitioning module and a control module. The temperature monitoring module is connected to the electronic thermometer 7. The temperature monitoring module is used to obtain the measurement results of the electronic thermometer 7 and record and upload them.

[0034] Reference Figure 2 In a preferred embodiment, the temperature partitioning module is used to set the numerical values ​​of different partitions, the numerical recognition module is used to identify the monitoring results obtained by the temperature monitoring module, determine and match them to different temperature zones, and the control module is used to automatically control the first gas valve 5, the second gas valve 6, the third gas valve 16 and the heat storage device 13 according to the recognition results of the numerical recognition module.

[0035] Reference Figure 2 In a preferred embodiment, the temperature partition module is specifically used to set the temperature values ​​of the medium temperature zone, the low temperature zone, and the ultra-low temperature zone, wherein the temperature of the medium temperature zone is set at 5°C-0°C, the temperature of the low temperature zone is set at 0°C--2°C, and the temperature of the ultra-low temperature zone is set below -2°C. In the temperature monitoring system, the temperature monitoring module monitors the measurement results of the electronic thermometer, and the value recognition module identifies which temperature zone the temperature is in, that is, the required defrosting mode can be adjusted through the control module. Based on the fact that the evaporator 1 is the component most prone to frost, directly monitoring its surface temperature can determine the degree of frost inside the air conditioner according to the partition, wherein the medium temperature zone indicates that the evaporator 1 itself may have For the frosting phenomenon, a small amount of hot air can be used to defrost the evaporator 1 by reducing the air suction volume of the first air intake pipe 12 and closing the second air valve 6. The low temperature zone indicates that the evaporator 1 itself may be frozen. On the basis of the regulation in the medium temperature zone, the heating of the heat storage device 13 is controlled to meet the defrosting of the evaporator 1. The ultra-low temperature zone indicates that the ambient temperature is too low, and components other than the evaporator 1 may also be frosted. Therefore, on the basis of the regulation in the low temperature zone, the air suction volume of the first air intake pipe 12 is increased, and the second air valve 6 is opened synchronously, so that the warm air can pass through multiple structures in sequence to complete the overall defrosting. Under this structure, the defrosting state can be adjusted according to different temperature environments, which can save the defrosting cost to a certain extent.

[0036] Reference Figure 4-Figure 6 In a preferred embodiment, the heat storage device 13 includes a support bin 1301, and a heat storage bin 1306 is connected to the inner center of the support bin 1301, an electric heating plate 1304 is installed on the top inner wall of the support bin 1301, and the inner walls on both sides of the support bin 1301 are respectively provided with a first air inlet 1302, a second air inlet 1303 and an air outlet 1305.

[0037] Reference Figure 4-Figure 6In a preferred embodiment, a heat exchange channel 1307 is provided inside the heat storage bin 1306, and the input end of the heat exchange channel 1307 is respectively connected to the first air inlet 1302 and the second air inlet 1303, the output end of the heat exchange channel 1307 is connected to an extension pipe 1309, and the extension pipe 1309 is connected to the air outlet 1305, the heat storage bin 1306 is filled with a phase change heat storage material 1308, and the heat storage device 13 mainly absorbs and exchanges heat through the phase change heat storage material 1308 filled in the heat storage bin 1306. When part of the warm air drawn out from the air outlet 11 enters the heat exchange channel 1307, the heat inside can be made to The phase change heat storage material 1308 in the part absorbs the heating temperature and stores it. Based on the excellent heat storage and heat exchange effects of the phase change heat storage material 1308, the residual heat after the electric heating plate 1304 is turned on and the heat absorbed by the heating can be preserved, so that the internal temperature of the entire heat storage bin 1306 can be maintained in a relatively warm constant temperature state. Therefore, when the cool air extracted by the compressor enters the heat storage device 13 and mixes with the heating air, the mixed air can be heated after passing through the heat exchange flow channel 1307 again so that it can meet the defrosting temperature in the medium temperature range. Under this structure, the extracted heating temperature can be fully utilized to reduce the heating electricity expenditure of the electric heating plate 1304 and reduce the cost of using air conditioners.

[0038] Working principle: through the setting of the first air inlet pipe 12 and the second air inlet pipe 14, the warm air can be drawn from the air outlet 11 and mixed with the air drawn by the compressor 9 which is diverted from the second air inlet pipe 14. After entering the heat storage 13 for heating, the heat exchange tube 18 is attached to the surface of the evaporator 1, the condenser 10 and the corresponding structure to achieve the defrosting effect of multiple structures. Under this defrosting structure, the warm air is directly diverted from the air outlet 11 to make full use of the warm heat. Compared with the method of directly drawing the warm air from the room for reuse, this method can reduce the loss of warm heat, and limit the air flow range through the heat exchange tube 18, reduce the amount of air required for defrosting, and achieve the defrosting effect of multiple parts at the same time. At the same time, in the temperature monitoring system, the measurement results of the electronic thermometer are monitored by the temperature monitoring module, and the temperature zone of the temperature is identified by the numerical recognition module, that is, it can be The required defrost mode is adjusted through the control module. Based on the fact that the evaporator 1 is the component most prone to frost, its surface temperature can be directly monitored to determine the degree of frost inside the air conditioner according to the partition. The medium temperature zone indicates that the evaporator 1 itself may be frosted. By reducing the air suction volume of the first air inlet pipe 12 and closing the second air valve 6, a small amount of hot air can be used to defrost the evaporator 1. The low temperature zone indicates that the evaporator 1 itself may be frozen. On the basis of the medium temperature zone control, the heat storage device 13 is controlled to heat to meet the de-icing of the evaporator 1. The ultra-low temperature zone indicates that the ambient temperature is too low, and components other than the evaporator 1 may also be frosted. Therefore, on the basis of the low temperature zone control, the air suction volume of the first air inlet pipe 12 is increased, and the second air valve 6 is opened synchronously, so that the warm air can pass through multiple structures in sequence to complete the overall defrosting. Under this structure, the defrosting state can be adjusted according to different temperature environments, which can save the defrosting cost to a certain extent.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-icing automatic defrosting system for a HVAC heat pump unit, comprising an evaporator (1), an expansion valve (4), a drying bottle (8), a compressor (9), a condenser (10), a heat storage device (13), an electromagnetic four-way valve (15), an air outlet (11) and an electric control (17), characterized in that: The evaporator (1), the expansion valve (4), the drying bottle (8), the compressor (9), the condenser (10), the heat storage device (13) and the electromagnetic four-way valve (15) are connected to each other through pipelines. The inner walls on opposite sides of the heat storage device (13) are respectively connected to a first air intake pipe (12), a second air intake pipe (14) and a heat exchange pipe (18). The first air intake pipe (12) is connected to an air outlet (11), and an air pump is installed on the first air intake pipe (12). The second air intake pipe (14) is connected to a pipeline between the compressor (15) and the evaporator (1). Part of the outer wall of the heat exchange pipe (18) is sequentially attached to the evaporator (1), the pipeline between the evaporator (1) and the condenser (10), and the outer wall of the condenser (10).

2. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 1, characterized in that: An electronic thermometer (7) is provided on one side of the evaporator (1), and a measuring end of the electronic thermometer (7) is attached to the outer wall of the evaporator (1); a second exhaust port (3) is provided on the inner wall of the middle section of the heat exchange tube (18), and a first exhaust port (2) is provided on the inner wall of the end section of the heat exchange tube (18).

3. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 2, characterized in that: The second exhaust port (3) is connected to a first air valve (5), the middle section of the heat exchange tube (18) is provided with a second air valve (6), and the second air valve (6) is located behind the second exhaust port (3).

4. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 3, characterized in that: The second air intake pipe (14) is provided with a third air valve (16), and the third air valve (16) is connected to the second air intake pipe (14) and the pipe connection between the compressor (15) and the evaporator (1). The electric control (17) is equipped with a temperature monitoring system, and the temperature monitoring system is simultaneously connected to the motor thermometer (7), the first air valve (5), the second air valve (6), the third air valve (16) and the heat storage device (13).

5. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 4, characterized in that: The temperature monitoring system comprises a temperature monitoring module, a value recognition module, a temperature partitioning module and a control module. The temperature monitoring module is connected to the electronic thermometer (7). The temperature monitoring module is used to obtain the measurement results of the electronic thermometer (7) and record and upload them.

6. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 5, characterized in that: The temperature partitioning module is used to set the values ​​of different partitions, the value identification module is used to identify the monitoring results obtained by the temperature monitoring module, determine and match them to different temperature zones, and the control module is used to automatically control the first gas valve (5), the second gas valve (6), the third gas valve (16) and the heat storage device (13) according to the identification results of the value identification module.

7. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 6, characterized in that: The temperature zoning module is specifically used to set the temperature values ​​of the medium temperature zone, the low temperature zone, and the ultra-low temperature zone, wherein the temperature of the medium temperature zone is set at 5°C-0°C, the temperature of the low temperature zone is set at 0°C--2°C, and the temperature of the ultra-low temperature zone is set below -2°C.

8. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 1, characterized in that: The heat storage device (13) comprises a support bin (1301), and a heat storage bin (1306) is connected to the inner center of the support bin (1301), an electric heating plate (1304) is installed on the inner wall at the top end of the support bin (1301), and the inner walls on both sides of the support bin (1301) are respectively provided with a first air inlet (1302), a second air inlet (1303) and an air outlet (1305).

9. The anti-icing automatic defrosting system of a HVAC heat pump unit according to claim 8, characterized in that: A heat exchange channel (1307) is arranged inside the heat storage bin (1306), and the input end of the heat exchange channel (1307) is respectively connected to the first air inlet (1302) and the second air inlet (1303), the output end of the heat exchange channel (1307) is connected to an extension pipe (1309), and the extension pipe (1309) is connected to the air outlet (1305), and the heat storage bin (1306) is filled with a phase change heat storage material (1308).

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