TWI554735B - Heat exchange system with automatic defrost function - Google Patents

Description

Heat exchange system with automatic defrosting function

The present invention relates to a heat exchange system, and more particularly to a heat exchange system having an automatic defrosting function capable of automatically performing an evaporator defrosting action in a relatively more simplified configuration.

According to the current hotspots such as air conditioners, refrigerators, air conditioners, ice water main engines, refrigerators, heat pump water heaters, etc., the most basic components include evaporators, compressors, heat exchangers, and expansion. The main components such as valves are sequentially connected between the above components by a refrigerant pipe to form a circulating operation effect of cooling the refrigerant in the evaporator and heating in the heat exchanger.

Taking a conventional heat pump system as an example, a refrigerant, a compressor, a heat exchanger, an expansion valve and the like are sequentially connected in a refrigerant tube, and the refrigerant tube is filled with a refrigerant in each of the refrigerant tubes. The component moves cyclically; in use, the liquid refrigerant enters the evaporator and absorbs external heat in the evaporator to evaporate into a gaseous state.

The gaseous refrigerant is further compressed by the compressor to increase the temperature; then the high-pressure gaseous refrigerant enters the heat exchanger and exchanges heat with the water in the heat exchanger to release heat and liquefy, so that the water in the heat exchanger is heated. Effect; finally the liquid refrigerant moves to the expansion valve and is decompressed, and then re-enters the evaporator for recycling.

Also, when the evaporator of a similar heat exchange system is absorbing heat from the outside When the amount is too large, such as taking heat from cold outdoor low-temperature air, it may cause moisture in the air to condense on the evaporator (frosting), which may hinder the passage of air and cause the evaporator to fail. use. It is known that the conventional heat pump heat system can defrost the evaporator by means of equipment shutdown natural defrosting, hot gas bypass (HGVB) or 4-way valve switching.

However, the overall heat pump system must not only increase the pipeline cost and maintenance cost of the solenoid valve, the square valve and the defrost circuit, but also during the defrosting process of the evaporator, the system will not be able to continue to produce hot water and reduce the water temperature in the thermostat. Therefore, there is often a problem of using cold water without warning; therefore, how to provide a heat exchange system that can automatically perform the defrosting operation of the evaporator in a relatively simpler structure has long been a problem that the industry has been trying to solve. .

In view of the above, the present invention provides a heat exchange system having an automatic defrosting function capable of automatically performing an evaporator defrosting operation in a relatively more simplified configuration, as its main purpose.

The heat exchange system with automatic defrosting function of the invention is characterized in that an evaporator, a compressor, a heat exchanger and an electronic expansion valve are sequentially connected by a refrigerant pipe for supplying refrigerant to the evaporator and the compressor. a heat transfer between the heat exchanger and the electronic expansion valve, and a control circuit electrically connected to at least the evaporator, the compressor and the electronic expansion valve; wherein the heat exchanger is provided with a fluid for controlling the application Passing the flow control device of the heat exchanger or not, the flow control device is electrically connected to the control circuit; and the heat exchange system with automatic defrosting function is provided with the control at the evaporator a temperature sensor electrically connected to the circuit, wherein the temperature sensor outputs a corresponding current signal to the control circuit according to the sensed temperature, and the control circuit is provided with a temperature comparison threshold value, and at least one of the When the current signal of the temperature sensor is higher than the temperature comparison threshold, the valve of the electronic expansion valve maintains the normal opening degree and the normal operation mode of the flow control device is normal, and when the temperature sensor is When the current signal is lower than the temperature comparison threshold value, the valve opening degree of the electronic expansion valve becomes large and the defrosting operation mode for stopping the flow control device is stopped.

By using the above technical features, the heat exchange system with automatic defrosting function of the present invention receives the current signal transmitted by the temperature sensor at any time by the control circuit under normal operating conditions, and determines whether the operation of the evaporator is normal or not. When the evaporator has frosting, it can enter the automatic defrost mode without turning off the compressor, and the valve opening of the electronic expansion valve becomes larger, and the flow control device is temporarily stopped, so that the evaporation is improved. The refrigerant temperature of the device is directly exchanged into the evaporator by the high-temperature refrigerant for heat exchange, and the rapid cold-heat exchange melts the frost to achieve the purpose of automatic defrosting; and when the control circuit determines that the evaporator has returned to the normal temperature, the electronic expansion valve is The valve is returned to the normal opening and the flow control device is returned to normal operation to restore the established normal operating mode.

According to the above technical feature, the heat exchanger is provided with a heat exchange chamber covering the refrigerant tube; the flow control device is provided with at least one water inlet pipe communicating with the heat exchange chamber, and at least one and the heat exchange chamber The connecting water pipes are respectively provided with a solenoid valve electrically connected to the control circuit at each water inlet pipe and each water outlet pipe.

According to the above technical feature, the heat exchanger is provided with a heat exchange chamber covering the refrigerant tube; the flow control device is provided with a water storage tank, and at least one is connected between the water storage barrel and the heat exchange chamber. The water inlet pipe, and at least one outlet pipe connected between the water storage tank and the heat exchanger, and each of the water inlet pipe and each of the water outlet pipes are respectively provided with a solenoid valve electrically connected to the control circuit.

According to the above technical feature, the heat exchanger is provided with a cold a heat pipe connected to the medium pipe; the flow control device is provided with at least one fan electrically connected to the control circuit.

The heat exchange system with automatic defrosting function is provided with at least one filter at a refrigerant pipe between the heat exchanger and the electronic expansion valve.

The heat exchange system with an automatic defrosting function is provided with at least one filter at a refrigerant pipe between the electronic expansion valve and the evaporator.

The heat exchange system with an automatic defrosting function is disposed at a refrigerant pipe between the heat exchanger and the electronic expansion valve, and at least at a refrigerant pipe between the electronic expansion valve and the evaporator A filter.

The heat exchange system with automatic defrosting function is provided with a high-voltage detector electrically connected to the control circuit at a refrigerant pipe between the compressor and the heat exchanger, and the compressor and the evaporation A low voltage detector electrically connected to the control circuit is disposed at the refrigerant tube between the devices.

The heat exchange system with an automatic defrosting function is disposed at a refrigerant pipe between the electronic expansion valve and the evaporator, and at least one of a refrigerant pipe between the electronic expansion valve and the evaporator a filter; and a high-pressure detector electrically connected to the control circuit between the compressor and the heat exchanger, and a refrigerant pipe between the compressor and the evaporator There is a low voltage detector electrically connected to the control circuit.

The heat exchange system with automatic defrosting function of the invention is characterized in that an evaporator, a compressor, a heat exchanger and an electronic expansion valve are sequentially connected by a refrigerant pipe for supplying refrigerant to the evaporator and the compressor. a heat transfer between the heat exchanger and the electronic expansion valve, and a control circuit electrically connected to at least the evaporator, the compressor and the electronic expansion valve; wherein the heat exchanger is provided with a fluid for controlling the application Passing the flow control device of the heat exchanger or not, the flow control device is electrically connected to the control circuit; characterized in that the heat exchange with automatic defrosting function The system is provided with a temperature sensor electrically connected to the control circuit, and the temperature sensor outputs a corresponding current signal to the control circuit according to the sensed temperature, and the control circuit is provided with a temperature. Comparing the threshold value, and at least one of the normal operation modes of the valve of the electronic expansion valve to maintain the normal opening degree and the normal operation of the flow control device when the current signal of the temperature sensor is higher than the temperature threshold value And a defrosting operation mode in which the valve opening degree of the electronic expansion valve becomes large and the flow control device stops operating when the current signal of the temperature sensor is lower than the temperature comparison threshold; the heat exchange The device is provided with a heat exchange chamber covering the refrigerant tube; the flow control device is provided with a water storage tank, and at least one water inlet pipe connected between the water storage tank and the heat exchange chamber, and at least one connected to a water outlet pipe between the water storage tank and the heat exchanger, and a solenoid valve electrically connected to the control circuit at each of the water inlet pipe and each water outlet pipe; the electronic expansion valve and the electronic expansion valve At least one filter is disposed at a refrigerant pipe between the generator, and at a refrigerant pipe between the electronic expansion valve and the evaporator; a refrigerant pipe is disposed between the compressor and the heat exchanger A high-voltage detector electrically connected to the control circuit, and a low-voltage detector electrically connected to the control circuit at a refrigerant pipe between the compressor and the evaporator.

Specifically, the heat exchange system with automatic defrosting function disclosed in the present invention can produce the following effects:

1. The defrosting action can be performed while the compressor is running, so that the established operating efficiency can be quickly replied.

2. It can save the cost of construction and maintenance of high-priced valve parts and complicated pipelines.

3, can be applied to the heat pump system, with a relatively more active and reliable means to solve the problem of lowering the temperature of the hot water when the heat pump water heater is defrosting

4. It can be applied to the refrigerating and air-conditioning system to solve the problem of low heat exchange efficiency caused by frosting of the refrigerating and air-conditioning system in the evaporator with relatively more active and reliable means. question.

10‧‧‧ refrigerant tube

20‧‧‧Evaporator

30‧‧‧Compressor

40‧‧‧ heat exchanger

41‧‧‧Flow control device

411‧‧‧ water pipes

412‧‧‧Outlet

413‧‧‧Solenoid valve

414‧‧ ‧ water bucket

415‧‧‧fan

42‧‧‧Heat exchange room

43‧‧‧ radiator

50‧‧‧Electronic expansion valve

60‧‧‧Control circuit

70‧‧‧temperature sensor

81‧‧‧Filter

82‧‧‧High Voltage Detector

83‧‧‧Low-voltage detector

1 is a schematic diagram showing the basic composition of a heat exchange system with an automatic defrosting function according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing the circulation of the refrigerant and the applied fluid in the normal operation mode of the heat exchange system with the automatic defrosting function of the first embodiment.

Fig. 3 is a schematic view showing the circulation of the refrigerant in the automatic defrosting mode of the heat exchange system with the automatic defrosting function of the first embodiment.

Fig. 4 is an enlarged schematic view showing the structure of a heat exchanger in the first embodiment of the present invention.

Fig. 5 is a schematic view showing the basic composition of a heat exchange system with an automatic defrosting function according to a second embodiment of the present invention.

The present invention mainly provides a heat exchange system with an automatic defrosting function capable of automatically performing an evaporator defrosting operation in a relatively more simplified configuration. As shown in FIG. 1, the heat exchange with automatic defrosting function of the present invention is shown. The system basically connects an evaporator 20, a compressor 30, a heat exchanger 40 and an electronic expansion valve 50 in sequence with the refrigerant pipe 10 for supplying refrigerant to the evaporator 20, the compressor 30, and the like. The heat exchanger 40 and the electronic expansion valve 50 are cyclically moved, and another control circuit 60 is electrically connected to at least the evaporator 20, the compressor 30, and the electronic expansion valve 50.

The heat exchanger 40 is provided with a flow control device 41 for controlling whether or not the applied fluid passes through the heat exchanger 40. The flow control device 41 is electrically connected to the control circuit 60. The present invention is characterized in that: The heat exchange system having an automatic defrosting function is provided at the evaporator 20 with at least a temperature sensor 70 electrically connected to the control circuit 60, and the temperature sensor 70 controls the temperature according to the sensed temperature. The circuit 60 outputs a corresponding current signal, the control circuit 60 is provided with a temperature comparison threshold value, and at least one of the electronic expansion valve 50 is used when the current signal of the temperature sensor 70 is higher than the temperature comparison threshold value. The normal operating mode in which the valve maintains the normal opening and the flow control device 41 is normally operated, and when the current signal of the temperature sensor 70 is lower than the temperature comparison threshold, the valve of the electronic expansion valve 50 is opened. The defrosting mode of operation is increased and the flow control device 41 is stopped.

In principle, the heat exchange system with automatic defrosting function of the present invention receives the current signal transmitted by the temperature sensor 70 at any time by the control circuit 60 under normal operating conditions, and determines whether the operation of the evaporator 20 is normal or not. In the case where the evaporator 20 has no frost, the control circuit 60 controls the heat exchange system with the automatic defrosting function to control the normal operation mode of the valve of the electronic expansion valve 50 to maintain the normal opening degree and the flow control device 41 to operate normally. .

The heat exchange system with automatic defrosting function is in a normal operation mode (as shown in FIG. 2), the liquid refrigerant enters the evaporator 20, and absorbs external heat in the evaporator 20 to evaporate into a gaseous state. The gaseous refrigerant is then further compressed by the compressor 30 to increase the temperature, and then the high pressure gaseous refrigerant enters the heat exchanger 40 and exchanges heat with the fluid passing through the heat exchanger 40 to release heat and liquefy, passing through the heat exchanger 40. The fluid produces a heating effect; finally, the liquid refrigerant moves to the electronic expansion valve 50 and is decompressed, and then re-enters the evaporator 20 for recycling.

Moreover, when the control circuit 60 determines that the evaporator 20 has frosting according to the current signal transmitted by the temperature sensor 70, it can enter the automatic defrost mode without expanding the compressor 30, and expand the electron. The valve opening degree of the valve 50 becomes large, and the flow control device 41 is temporarily stopped (as shown in Fig. 3), so that the passage is improved. The temperature of the refrigerant of the evaporator 20 is directly exchanged into the evaporator 20 for heat exchange by the high-temperature refrigerant, and the rapid cold-heat exchange causes the frost to melt to achieve the purpose of automatic defrosting; and when the control circuit 60 determines that the evaporator 20 has returned to the normal temperature. That is, the valve of the electronic expansion valve 50 is returned to the normal opening degree, and the flow control device 41 is returned to the normal operation to restore the established normal operating mode.

In the embodiment shown in FIGS. 1 to 4, the heat exchanger 40 is provided with a heat exchange chamber 42 covering the refrigerant tube 10; the flow control device 41 is provided with at least one An inlet pipe 411 communicating with the heat exchange chamber 42 and at least one outlet pipe 412 communicating with the heat exchange chamber 42 and an electromagnetic connection electrically connected to the control circuit 60 at each inlet pipe 411 and each outlet pipe 412 are respectively provided. The valve 413 is configured to control whether the set inlet pipe 411 or the outlet pipe 412 is electrically connected by the electromagnetic valve 413 to control whether the applied fluid (water liquid) passes through the heat exchanger 40 or not.

In the embodiment, the heat exchanger 20 is provided with a heat exchange chamber 42 for enclosing the refrigerant tube 10. The whole flow control device 41 is provided with a water storage tank 414, and at least one is connected to the storage. The water inlet pipe 411 between the water tank 414 and the heat exchange chamber 42 and at least one water outlet pipe 412 connected between the water storage tank 414 and the heat exchanger 40 are further divided into the water inlet pipes 411 and the water outlet pipes 412. A solenoid valve 413 that is electrically coupled to the control circuit 60 is provided to further form a complete heat pump system.

Of course, the heat exchange system with the automatic defrosting function of the present invention may be implemented as shown in FIG. 5, and the heat exchanger 40 is provided with a heat sink 43 connected to the refrigerant tube 10; The flow control device 41 is provided with at least one fan 415 electrically connected to the control circuit 60, so as to further form a complete refrigerating and air-conditioning system, and control the fan 415 by controlling whether the fan 415 is operated or not. The applied fluid (empty) passes through the heat exchanger 40 or not purpose.

It is worth mentioning that the heat exchange system with automatic defrosting function of the present invention is applied to the heat pump system shown in Figs. 1 to 4 or to the refrigerating air conditioning system as shown in Fig. 5. a heat exchange system having an automatic defrosting function, wherein at least one filter 81 is disposed between the heat exchanger 40 and the electronic expansion valve 50; or the electronic expansion valve 50 At least one filter 81 is disposed at the refrigerant pipe 10 between the evaporators 20, and the moisture in the refrigerant is filtered by the filter 81.

Of course, a heat exchange system having an automatic defrosting function as shown in the figure is shown at the refrigerant pipe 10 between the heat exchanger 40 and the electronic expansion valve 50, and the electronic expansion valve 50 and the evaporator. Preferably, at least one filter 81 is provided at each of the refrigerant tubes 10 between the two.

Furthermore, a heat exchange system having an automatic defrosting function as a whole may further be provided with a high voltage detector 82 electrically connected to the control circuit 60 at the refrigerant pipe 10 between the compressor 30 and the heat exchanger 40. Further, a low-voltage detector 83 electrically connected to the control circuit 60 is disposed at the refrigerant pipe 10 between the compressor 30 and the evaporator 20 for monitoring whether the operation state of the refrigerant is normal at any time.

Similarly, a heat exchange system having an automatic defrosting function as shown in the figure, at the refrigerant pipe 10 between the heat exchanger 40 and the electronic expansion valve 50, and the electronic expansion valve 50 and the evaporation At least one filter 81 is respectively disposed at the refrigerant pipe 10 between the devices 20; and a high voltage electrically connected to the control circuit 60 is disposed at the refrigerant pipe 10 between the compressor 30 and the heat exchanger 40. The detector 82 is preferably provided with a structure of a low-voltage detector 83 electrically connected to the control circuit 60 at the refrigerant pipe 10 between the compressor 30 and the evaporator 20.

Compared with the conventional technology, the heat exchange system with automatic defrosting function disclosed in the present invention can produce the following effects:

1. The defrosting action can be performed while the compressor is running, so that the established operating efficiency can be quickly replied.

2. It can save the cost of construction and maintenance of high-priced valve parts and complicated pipelines.

3, can be applied to the heat pump system, with a relatively more active and reliable means to solve the problem of lowering the temperature of the hot water when the heat pump water heater is defrosting

4. It can be applied to the refrigerating and air-conditioning system to solve the problem of low heat exchange efficiency caused by frosting of the refrigerating and air-conditioning system in the evaporator by a relatively more active and reliable means.

In summary, the present invention provides a preferred heat exchange system with an automatic defrosting function, and an application for an invention patent according to the law; the technical content and technical features of the present invention have been disclosed above, but are familiar with the present technology. It is still possible for a person to make various substitutions and modifications without departing from the spirit of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims

10‧‧‧ refrigerant tube

20‧‧‧Evaporator

30‧‧‧Compressor

40‧‧‧ heat exchanger

41‧‧‧Flow control device

411‧‧‧ water pipes

412‧‧‧Outlet

413‧‧‧Solenoid valve

414‧‧ ‧ water bucket

42‧‧‧Heat exchange room

50‧‧‧Electronic expansion valve

60‧‧‧Control circuit

70‧‧‧temperature sensor

81‧‧‧Filter

82‧‧‧High Voltage Detector

83‧‧‧Low-voltage detector

Claims (10)

A heat exchange system with an automatic defrosting function, wherein an evaporator, a compressor, a heat exchanger and an electronic expansion valve are sequentially connected by a refrigerant pipe for supplying refrigerant to the evaporator, the compressor, and the a heat exchanger and the electronic expansion valve are cyclically moved, and another control circuit is electrically connected to at least the evaporator, the compressor and the electronic expansion valve; wherein the heat exchanger is provided with a fluid for controlling the application a flow control device of the heat exchanger or not, the flow control device is electrically connected to the control circuit; wherein the heat exchange system with automatic defrosting function is provided with at least one control circuit at the evaporator The temperature sensor of the electrical connection, the temperature sensor outputs a corresponding current signal to the control circuit according to the sensed temperature, the control circuit is provided with a temperature comparison threshold value, and at least one of the temperature sensors When the current signal is higher than the temperature comparison threshold, the valve of the electronic expansion valve maintains the normal opening degree and the normal operation mode of the flow control device is normal, A temperature sensor when the current signal is lower than the temperature threshold comparison, and even if the valve opening degree of the electronic expansion valve becomes larger and the flow control means enabling the operation of stopping the defrosting operation mode. The heat exchange system with automatic defrosting function according to claim 1, wherein the heat exchanger is provided with a heat exchange chamber covering the refrigerant tube; and the flow control device is provided with at least one heat exchange chamber The communicating water inlet pipe and the at least one water outlet pipe communicating with the heat exchange chamber are respectively provided with a solenoid valve electrically connected to the control circuit at each water inlet pipe and each water outlet pipe. The heat exchange system with automatic defrosting function according to claim 1, wherein the heat exchanger is provided with a heat exchange chamber covering the refrigerant tube; the flow control device is provided with a water storage bucket, and at least a water inlet pipe connected between the water storage tank and the heat exchange chamber, and at least one water outlet pipe connected between the water storage tank and the heat exchanger, and one at each of the water inlet pipe and each of the water outlet pipes Electrical with the control circuit Connected solenoid valve. The heat exchange system with automatic defrosting function according to claim 1, wherein the heat exchanger is provided with a heat sink connected to the refrigerant tube; the flow control device is provided with at least one The control circuit is electrically connected to the fan. The heat exchange system with automatic defrosting function according to any one of claims 1 to 4, wherein the heat exchange system with automatic defrosting function is between the heat exchanger and the electronic expansion valve At least one filter is provided at the refrigerant pipe. The heat exchange system with automatic defrosting function according to any one of claims 1 to 4, wherein the heat exchange system with automatic defrosting function is between the electronic expansion valve and the evaporator At least one filter is provided at the refrigerant pipe. The heat exchange system with automatic defrosting function according to any one of claims 1 to 4, wherein the heat exchange system with automatic defrosting function is between the heat exchanger and the electronic expansion valve At least one filter is disposed at the refrigerant pipe, and at the refrigerant pipe between the electronic expansion valve and the evaporator. The heat exchange system with automatic defrosting function according to any one of claims 1 to 4, wherein the heat exchange system with automatic defrosting function is between the compressor and the heat exchanger A high-voltage detector electrically connected to the control circuit is disposed at the refrigerant tube, and a low-voltage detector electrically connected to the control circuit is disposed at the refrigerant tube between the compressor and the evaporator. A heat exchange system with an automatic defrosting function according to any one of claims 1 to 2, wherein the heat exchange system having an automatic defrosting function is attached to the electronic expansion valve and the evaporator At least one filter is disposed between the refrigerant tube and the refrigerant tube between the electronic expansion valve and the evaporator; and a refrigerant tube is disposed between the compressor and the heat exchanger The high voltage detector electrically connected to the control circuit is further provided with a low voltage detector electrically connected to the control circuit between the compressor and the evaporator. A heat exchange system with an automatic defrosting function, wherein an evaporator, a compressor, a heat exchanger and an electronic expansion valve are sequentially connected by a refrigerant pipe for supplying refrigerant to the evaporator, the compressor, and the a heat exchanger and the electronic expansion valve are cyclically moved, and another control circuit is electrically connected to at least the evaporator, the compressor and the electronic expansion valve; wherein the heat exchanger is provided with a fluid for controlling the application a flow control device of the heat exchanger or not, the flow control device is electrically connected to the control circuit; wherein the heat exchange system with automatic defrosting function is provided with at least one control circuit at the evaporator The temperature sensor of the electrical connection, the temperature sensor outputs a corresponding current signal to the control circuit according to the sensed temperature, the control circuit is provided with a temperature comparison threshold value, and at least one of the temperature sensors When the current signal is higher than the temperature comparison threshold, the valve of the electronic expansion valve maintains the normal opening degree and the normal operation mode of the flow control device is normal, When the current signal of the temperature sensor is lower than the temperature threshold, the defrosting mode of the valve opening of the electronic expansion valve is increased and the flow control device is stopped; the heat exchanger is Providing a heat exchange chamber covering the refrigerant tube; the flow control device is provided with a water storage tank, and at least one water inlet pipe connected between the water storage tank and the heat exchange chamber, and at least one connected to the storage a water outlet pipe between the water tank and the heat exchanger, and a solenoid valve electrically connected to the control circuit at each water inlet pipe and each water outlet pipe; a refrigerant pipe between the electronic expansion valve and the evaporator And at least one filter is respectively disposed at the refrigerant pipe between the electronic expansion valve and the evaporator; and a refrigerant pipe between the compressor and the heat exchanger is electrically connected to the control circuit. The high voltage detector is further provided with a low voltage detector electrically connected to the control circuit at the refrigerant pipe between the compressor and the evaporator.