Internal and external circulation cooling and heating integrated machine

Abstract

The present invention discloses an internal and external circulation refrigeration and heating integrated machine, including an internal circulation loop and an external circulation loop; the internal circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a second expansion valve, a dehumidifier and a four-way valve connected at the end; the external circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a one-way valve group, a third expansion valve, an evaporator and a four-way valve connected at the end. The present invention adopts the internal and external circulation refrigeration and heating integrated machine of the above structure, by setting the internal circulation loop and the external circulation loop, the internal circulation and the external circulation are flexibly switched through the heat exchanger according to the external ambient temperature, and by controlling the opening and closing of the four-way valve and the one-way valve group, the refrigerant in the control loop is operated forward or reversely, thereby switching the cooling mode or the heating mode, which is more practical.

Description

Technical Field

[0001] The present invention relates to a refrigeration and heating technology, and in particular to an internal-external circulation refrigeration and heating integrated machine. Background Art

[0002] At present, the heat pump drying equipment on the market is classified into two types: integral integrated and split dryers. The integral heat pump drying equipment can be divided into two types: external circulation and internal circulation. The biggest advantage of the internal circulation type is that it can work normally without being restricted by the ambient temperature; the disadvantage is that the heating speed is slow and the temperature is not high. The advantage of the external circulation type is the fast heating speed; the disadvantage is that it is easily affected by the outdoor environment. When the outdoor temperature is high, the heating speed is fast, and when the outdoor temperature is low, the heating speed is slow. If the outdoor temperature is too low, it will not heat up normally, thus failing to achieve the ideal effect. The existing drying equipment can only choose external circulation or internal circulation, and cannot be flexibly switched according to the external environment. Summary of the invention

[0003] The purpose of the present invention is to provide an internal and external circulation refrigeration and heating integrated machine. By setting an internal circulation loop and an external circulation loop, the internal circulation and the external circulation can be flexibly switched through a heat exchanger according to the external ambient temperature, and by controlling the opening and closing of a four-way valve and a one-way valve group, the refrigerant in the control circuit can be operated forward or reversely, thereby switching the cooling mode or the heating mode, which is more practical.

[0004] To achieve the above-mentioned object, the present invention provides an internal and external circulation refrigeration and heating integrated machine, comprising an internal circulation loop and an external circulation loop;

[0005] The internal circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a second expansion valve, a dehumidifier and a four-way valve connected at the end;

[0006] The external circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a one-way valve group, a third expansion valve, an evaporator and a four-way valve connected at the end.

[0007] Preferably, the one-way valve group includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve connected in parallel;

[0008] The input end of the first one-way valve is connected in parallel with the output end of the second one-way valve, the output end of the first one-way valve is connected in parallel with the output end of the third one-way valve, the input end of the third one-way valve is connected in parallel with the output end of the fourth one-way valve, and the input end of the fourth one-way valve is connected in parallel with the input end of the second one-way valve;

[0009] The first one-way valve input end and the second one-way valve output end are also connected between the heat exchanger and the dehumidifier via a pipeline, the output end of the first one-way valve and the output end of the third one-way valve are connected between the second one-way valve input end and the fourth one-way valve input end via a two-way valve and the third expansion valve, and the output end of the fourth one-way valve and the input end of the third one-way valve are connected to the evaporator.

[0010] Preferably, the exhaust port of the compressor is connected to the D pipe of the four-way valve, and an oil return device is also connected between the exhaust port of the compressor and the D pipe of the four-way valve;

[0011] The first air suction port of the compressor is connected to the S pipe of the four-way valve, and an oil return device is also connected between the first air suction port of the compressor and the S pipe of the four-way valve;

[0012] The C tube of the four-way valve is connected to the condenser, and the E tube of the four-way valve is connected to the dehumidifier and the evaporator respectively.

[0013] Preferably, a fifth one-way valve is also connected between the dehumidifier and the E tube of the four-way valve.

[0014] Preferably, the heat exchanger is also connected to the second air intake port of the compressor via an enthalpy-increasing injection pipe.

[0015] Preferably, the first expansion valve, the second expansion valve and the third expansion valve are all electronic expansion valves.

[0016] Therefore, the present invention adopts the internal and external circulation refrigeration and heating integrated machine of the above-mentioned structure, and by setting up an internal circulation loop and an external circulation loop, the internal circulation and the external circulation can be flexibly switched through the heat exchanger according to the external ambient temperature, and by controlling the opening and closing of the four-way valve and the one-way valve group, the refrigerant in the control circuit can be operated forward or reversely, thereby switching the cooling mode or the heating mode, which is more practical.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a pipeline layout diagram of an internal and external circulation refrigeration and heating integrated machine according to an embodiment of the present invention;

[0019] Figure 2 It is a structural schematic diagram of an internal-external circulation refrigeration and heating integrated machine according to an embodiment of the present invention.

[0020] Among them: 1. compressor; 2. oil return device; 3. four-way valve; 4. fifth one-way valve; 5. second expansion valve; 6. condenser; 7. liquid storage device; 8. heat exchanger; 9. first expansion valve; 10. third expansion valve; 11. first one-way valve; 12. second one-way valve; 13. third one-way valve; 14. fourth one-way valve; 15. dehumidifier; 16. evaporator; 17. oil-water separator. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0022] Figure 1 This is a pipeline layout diagram of an internal and external circulation refrigeration and heating integrated machine according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an internal and external circulation refrigeration and heating integrated machine according to an embodiment of the present invention. As shown in the figure, the structure of the present invention includes an internal circulation loop and an external circulation loop;

[0023] Among them, the internal circulation loop includes a compressor, a four-way valve (D pipe in and C pipe out), a condenser, a first expansion valve, a heat exchanger, a second expansion valve, a dehumidifier and a four-way valve (E pipe in and S pipe out) connected at the end; the external circulation loop includes a compressor, a four-way valve (D pipe in and C pipe out) connected at the end, a condenser, a first expansion valve, a heat exchanger, a one-way valve group, a third expansion valve, an evaporator and a four-way valve (E pipe-S pipe).

[0024] Specifically, the exhaust port of the compressor is connected to the D tube of the four-way valve, and an oil return device is also connected between the exhaust port of the compressor and the D tube of the four-way valve; the first air intake port of the compressor is connected to the S tube of the four-way valve, and an oil return device is also connected between the first air intake port of the compressor and the S tube of the four-way valve; the C tube of the four-way valve is connected to the condenser, and the E tube of the four-way valve is connected to the dehumidifier and the evaporator respectively. A fifth one-way valve is also connected between the dehumidifier and the E tube of the four-way valve. A liquid reservoir is also connected between the heat exchanger and the condenser to prevent impurities in the pipeline from entering the compressor. The heat exchanger is also connected to the second air intake port of the compressor through the enthalpy-increasing jet pipe. In the enthalpy-increasing mode, the low-temperature gaseous refrigerator enters the middle cavity of the compressor through the enthalpy-increasing jet pipe, which reduces the internal temperature of the compressor, thereby reducing the exhaust temperature at the compressor outlet, thereby improving the operating stability of the refrigeration system. More specifically, the first interface of the heat exchanger is connected to the condenser, the second interface of the heat exchanger is connected to the compressor, the third interface of the heat exchanger is connected to one end of the first expansion valve, the fourth interface of the heat exchanger is connected to the dehumidifier, the other end of the first expansion valve is connected to the condenser via a two-way valve, and the condenser is also connected to the first interface of the heat exchanger; wherein the first expansion valve, the second expansion valve and the third expansion valve are all electronic expansion valves.

[0025] Preferably, the one-way valve group includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve connected in parallel; the input end of the first one-way valve is connected in parallel with the output end of the second one-way valve, the output end of the first one-way valve is connected in parallel with the output end of the third one-way valve, the input end of the third one-way valve is connected in parallel with the output end of the fourth one-way valve, and the input end of the fourth one-way valve is connected in parallel with the input end of the second one-way valve; the input end of the first one-way valve and the output end of the second one-way valve are also connected between the heat exchanger and the dehumidifier via a pipeline, the output end of the first one-way valve and the output end of the third one-way valve are connected between the input end of the second one-way valve and the input end of the fourth one-way valve via a two-way valve and a third expansion valve, and the output end of the fourth one-way valve and the input end of the third one-way valve are connected to the evaporator.

[0026] In the internal circulation mode, the second, third and fourth interfaces of the heat exchanger are opened, and the first interface is closed. The gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, which is filtered by the return oil filter and then enters the condenser to release heat and liquefy. The liquid refrigerant passes through the first expansion valve, the third interface of the heat exchanger, and the fourth interface of the heat exchanger, and then absorbs heat and vaporizes in the evaporator of the dehumidifier. Finally, the vaporized refrigerant enters the compressor for recirculation.

[0027] In the external circulation mode, the first interface, the second interface and the fourth interface of the heat exchanger are opened, and the third interface is closed. In this mode, the cooling mode or the heating mode can be entered by controlling the opening and closing of the one-way valve group;

[0028] In the external circulation refrigeration mode, the first and fourth check valves are opened, and the second and third check valves are closed. The gaseous refrigerant is pressurized by the compressor to become a high-temperature and high-pressure gas. After being filtered by the return oil filter, it enters the condenser (outdoor unit) to release heat and liquefy. The liquid refrigerant enters the evaporator (indoor unit) through the first interface, the fourth interface, and the check valve group of the heat exchanger to absorb heat and vaporize, thereby achieving the purpose of refrigeration. Finally, the vaporized refrigerant enters the compressor for recirculation.

[0029] In the external circulation heating mode, the second and third check valves are opened, and the first and fourth check valves are closed. The gaseous refrigerant is pressurized by the compressor to become a high-temperature and high-pressure gas. It passes through the oil separator and the four-way pipe E to the evaporator (indoor unit, at this time the evaporator plays the role of condensation) to liquefy and release heat to achieve the purpose of heating. The liquefied refrigerant passes through the third check valve, the third expansion valve, the second check valve, the fourth interface of the heat exchanger, and the first interface of the heat exchanger to enter the condenser (outdoor unit, at this time the condenser plays the role of evaporation) to absorb heat and vaporize. The vaporized refrigerant enters the compressor and circulates again.

[0030] Therefore, the present invention adopts the internal and external circulation refrigeration and heating integrated machine of the above-mentioned structure, and by setting up an internal circulation loop and an external circulation loop, the internal circulation and the external circulation can be flexibly switched through the heat exchanger according to the external ambient temperature, and by controlling the opening and closing of the four-way valve and the one-way valve group, the refrigerant in the control circuit can be operated forward or reversely, thereby switching the cooling mode or the heating mode, which is more practical.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An internal and external circulation refrigeration and heating integrated machine, characterized in that: It includes an inner circulation loop and an outer circulation loop; The internal circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a second expansion valve, a dehumidifier and a four-way valve connected end to end; The external circulation loop includes a compressor, a four-way valve, a condenser, a first expansion valve, a heat exchanger, a one-way valve group, a third expansion valve, an evaporator and a four-way valve connected end to end; The one-way valve group includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve connected in parallel; The input end of the first one-way valve is connected in parallel with the output end of the second one-way valve, the output end of the first one-way valve is connected in parallel with the output end of the third one-way valve, the input end of the third one-way valve is connected in parallel with the output end of the fourth one-way valve, and the input end of the fourth one-way valve is connected in parallel with the input end of the second one-way valve; The first one-way valve input end and the second one-way valve output end are also connected between the heat exchanger and the dehumidifier via a pipeline, the output end of the first one-way valve and the output end of the third one-way valve are connected between the second one-way valve input end and the fourth one-way valve input end via a two-way valve and a third expansion valve, and the output end of the fourth one-way valve and the input end of the third one-way valve are connected to the evaporator; The exhaust port of the compressor is connected to the D pipe of the four-way valve, and an oil return device is also connected between the exhaust port of the compressor and the D pipe of the four-way valve; The first air suction port of the compressor is connected to the S pipe of the four-way valve, and an oil return device is also connected between the first air suction port of the compressor and the S pipe of the four-way valve; The C tube of the four-way valve is connected to the condenser, and the E tube of the four-way valve is connected to the dehumidifier and evaporator respectively; In the internal circulation mode, the second, third and fourth interfaces of the heat exchanger are opened, and the first interface is closed. The gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, which is filtered by the return oil filter and then enters the condenser to release heat and liquefy. The liquid refrigerant passes through the first expansion valve, the third interface of the heat exchanger, and the fourth interface of the heat exchanger, and then absorbs heat and vaporizes in the evaporator of the dehumidifier. Finally, the vaporized refrigerant enters the compressor for recirculation. In the external circulation mode, the first interface, the second interface and the fourth interface of the heat exchanger are opened, and the third interface is closed. In this mode, the cooling mode or the heating mode is entered by controlling the opening and closing of the one-way valve group; In the external circulation refrigeration mode, the first and fourth check valves are opened, the second and third check valves are closed, and the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas. After being filtered by the return oil filter, it enters the condenser to release heat and liquefy. The liquid refrigerant enters the evaporator through the first and fourth interfaces of the heat exchanger and the check valve group to absorb heat and vaporize, achieving the purpose of refrigeration. Finally, the vaporized refrigerant enters the compressor for recirculation. In the external circulation heating mode, the second and third one-way valves are opened, and the first and fourth one-way valves are closed. The gaseous refrigerant is pressurized by the compressor to become a high-temperature and high-pressure gas. It passes through the oil separator and the four-way pipe E to the evaporator to liquefy and release heat to achieve the purpose of heating. The liquefied refrigerant passes through the third one-way valve, the third expansion valve, the second one-way valve, the fourth interface of the heat exchanger, and the first interface of the heat exchanger to enter the condenser to absorb heat and vaporize. The vaporized refrigerant enters the compressor and circulates again.

2. The internal and external circulation refrigeration and heating integrated machine according to claim 1, characterized in that: A fifth one-way valve is also connected between the dehumidifier and the E pipe of the four-way valve.

3. The internal and external circulation refrigeration and heating integrated machine according to claim 1, characterized in that: The heat exchanger is also connected to the second air intake port of the compressor via an enthalpy-increasing injection pipe.

4. The internal and external circulation refrigeration and heating integrated machine according to claim 1, characterized in that: The first expansion valve, the second expansion valve and the third expansion valve are all electronic expansion valves.

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