CN216744811U - Refrigerant circulation system and air conditioning unit - Google Patents

Abstract

The utility model relates to a refrigerant circulation system and an air conditioning unit, wherein the refrigerant circulation system includes a compressor and a first control valve, the compressor includes an inlet and an air supply port, and the first control valve is arranged on the connection passage between the air supply port and the inlet , wherein the refrigerant circulation system has a first heating mode. In the first heating mode, the second expansion valve is closed, the first expansion valve and the first control valve are both open, and the air supply port, the first control valve and the inlet are connected in sequence to form the first expansion valve. A self-circulation passage for increasing the internal temperature of the compressor.

Description

Refrigerant Circulation System and Air Conditioning Unit

technical field

The utility model relates to the technical field of air conditioners, in particular to a refrigerant circulation system and an air conditioner unit.

Background technique

With the continuous deepening and refinement of the country's "carbon neutrality", the multi-connection of photovoltaic heat pumps has become one of the important ways to achieve energy conservation and emission reduction. Since the multi-connection of photovoltaic heat pumps mainly relies on the "photovoltaic conversion" energy method to realize the operation of the unit, the electricity consumption of the national grid is reduced, and the carbon emission during thermal power generation is also reduced.

However, in the actual use process, the photovoltaic multi-connection often does not heat for a long time.

It should be noted that the information disclosed in the background of the present utility model is only intended to increase the understanding of the general background of the present utility model, and should not be construed as an acknowledgement or implied in any form that the information constitutes the knowledge of those skilled in the art. well-known prior art.

Utility model content

The embodiments of the present utility model provide a refrigerant circulation system and an air conditioning unit, which solve the problems in the related art that the air conditioning unit cannot be operated for a long time due to the outdoor unit being in a low temperature environment for a long time, the user's usage habits are restricted, or a large amount of liquid refrigerant is stored in the outer unit. heat problem.

According to the first aspect of the present utility model, a refrigerant circulation system is provided, comprising:

compressors, including inlet and make-up ports; and

The first control valve is arranged on the connection passage between the inlet and the air supply port;

The refrigerant circulation system has a first heating mode. In the first heating mode, the first control valve is opened, and the air supply port, the first control valve and the inlet are connected in sequence to form a first self-circulation passage.

In some embodiments, the refrigerant circulation system further includes a first expansion valve disposed between the supplemental air port and the first control valve.

In some embodiments, the refrigerant circulation system further includes an outdoor heat exchanger and a gas-liquid separator, the compressor further includes an outlet, and in the first heating mode, the outlet, the outdoor heat exchanger, the first control valve, the gas-liquid separator and The inlets are connected in sequence to form a second self-circulation passage.

In some embodiments, the refrigerant circulation system further includes a power supply, the compressor includes a rotor and a stator, the refrigerant circulation system has a second heating mode, and in the second heating mode, the power supply is in electrical communication with the stator to energize windings of the stator and dissipate heat.

In some embodiments, the refrigerant circulation system further includes a control device, the control device is signally connected to the first control valve and the power supply, and the control device is used to adjust the refrigerant circulation system to the first heating mode or the second heating mode.

In some embodiments, the refrigerant circulation system further includes a heating belt, the heating belt is wrapped around the outer periphery of the part to be heated in the refrigerant circulation system, the refrigerant circulation system has a third heating mode, and in the third heating mode, the heating belt is activated to pass The heating belt heats the part to be heated.

In some embodiments, the part to be heated includes the bottom of the compressor; or, the refrigerant circulation system further includes an oil-gas separator that communicates with the outlet, and the part to be heated includes the bottom of the oil-gas separator; or, the refrigerant circulation system further includes an oil-gas separator that communicates with the inlet. The gas-liquid separator, the part to be heated includes the bottom of the gas-liquid separator.

In some embodiments, the refrigerant circulation system further includes a control device, the control device is signally connected to the first control valve and the heating belt, and the control device is used to adjust the refrigerant circulation system to the first heating mode or the third heating mode.

In some embodiments, the refrigerant circulation system further includes a control device and a heating belt, the heating belt is wrapped around the outer periphery of the part to be heated in the refrigerant circulation system, the refrigerant circulation system has a third heating mode, and in the third heating mode, the heating belt is activated , in order to heat the part to be heated by the heating belt, the control device is connected with the first control valve, the power supply and the heating belt signal, and the control device is used to adjust the refrigerant circulation system to the first heating mode, the second heating mode or the third heating mode model.

According to a second aspect of the present invention, an air conditioning unit is provided, including the above-mentioned refrigerant circulation system.

Based on the above technical solutions, by setting the first self-circulation passage in the embodiment of the present invention, it is possible to realize the heating function of the compressor through the self-circulation of part of the pipeline of the outdoor unit when the indoor unit is kept in a non-working state, and effectively improve the compression rate. It can quickly drive the flow of the liquid refrigerant remaining in the outdoor heat exchanger and other components, so as to shorten the time for the air conditioning unit to start heating when the outdoor temperature is low, the user is accustomed to shutting down the air conditioning unit at night, or the air conditioning unit is left for a long time. Time is also conducive to protecting the compressor and improving the service life of the compressor.

Description of drawings

The accompanying drawings described here are used to provide further understanding of the present invention and constitute a part of the present application. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 is a schematic diagram of an embodiment of the refrigerant circulation system of the present invention.

FIG. 2 is a control flow chart of an embodiment of the refrigerant circulation system of the present invention.

FIG. 3 is a control flow chart of the second heating mode in an embodiment of the refrigerant circulation system of the present invention.

In the picture:

1, compressor; 2, indoor heat exchanger; 3, outdoor heat exchanger; 4, subcooler; 5, first expansion valve; 6, first control valve; 7, second expansion valve; 81, first Heating belt; 82, second heating belt; 83, third heating belt; 9, gas-liquid separator; 10, oil and gas separator; 11, control device; 12, photovoltaic power generation device; 13, load; 14, four-way valve ; 15, the third expansion valve; 16, the fourth expansion valve; 17, the second control valve; 18, the third control valve.

Detailed ways

The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "horizontal", "longitudinal", "front", "rear", "left", "right", "upper", "lower", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility. The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present invention.

In view of the phenomenon that photovoltaic multi-connection often does not heat for a long time, the inventor has conducted in-depth research and found that the main reasons for this phenomenon are:

1. The outdoor unit and pipeline are in a low temperature environment for a long time: the outdoor unit of the multi-connected unit is generally placed outdoors, and the connecting pipe of the internal and external units is relatively long. Although it is wrapped with thermal insulation cotton, it is still in direct contact with the low temperature environment;

2. Restrictions by user requirements or habits: the temperature in winter is low, and some commercial places will shut down or power off the air conditioning unit after get off work until the next day when it is turned on again, the unit cannot continue to heat, and the unit quickly cools down to the environment temperature, the unit does not heat for a long time when it is turned on again;

3. After being placed for a long time, the refrigerant is cooled, and there is a large amount of liquid refrigerant in the external unit and the long connecting pipe. After starting the next day, the liquid refrigerant in the external unit and the long connecting pipe must be heated first. This heating will be very long and affect Heating speed.

Based on the above findings, the inventor believes that for the problem that the photovoltaic heat pump multi-line unit does not heat for a long time, the first problem to be solved is the long-term shutdown or power-off state in a low temperature environment. The specific analysis is as follows:

A. Reasons for not heating at low temperature: The heating of the air source heat pump relies on the compressor to generate high temperature and high pressure gaseous refrigerant, and the heat is transferred to the room through the indoor heat exchanger. After being placed at a low temperature for a long time, a large amount of refrigerant becomes a liquid refrigerant, and the heat generated by the compressor must first heat this part of the liquid refrigerant, which greatly consumes the heating time. Moreover, in the case of extremely low temperature, due to the low ambient temperature, the low pressure of the system is too low, and the protection function of the system itself will limit the compressor to further increase the frequency, which will further cause the slow heating of the heating.

B. At the same time, it will also cause greater harm and impact on the compressor:

1. The lubricating oil of the compressor is diluted by the liquid refrigerant, because the liquid refrigerant continuously migrates to the inside of the compressor, and under the condition of low temperature, the oil and the refrigerant dissolve in each other, which is equivalent to diluting the oil, so it will cause oil shortage when the compression starts. resulting in internal wear;

2. Extend the time to achieve the heating effect, because the liquid refrigerant must be heated first, so it will directly affect the comfort;

3. The low temperature will also cause the viscosity of the oil to increase, which will cause the internal wear of the compressor.

For example, in the low temperature standby stage of the compressor, as the pressure and oil temperature superheat decrease, the more refrigerant in the oil pool, the lower the dissolved viscosity, which is detrimental to the reliability of the compressor; When starting, the discharge pressure of the compressor rises rapidly, and the temperature of the compressor changes relatively slowly, so the oil temperature superheat is low for a period of time after starting; while in the stable operation stage, the oil discharge rate of the compressor is relatively low. If the pressure is too high, the system pressure difference is large, and there is a risk of failure to return oil smoothly or liquid hammer.

To this end, the inventor has improved the refrigerant circulation system.

As shown in FIG. 1, in some embodiments of the refrigerant circulation system provided by the present invention, the refrigerant circulation system includes a compressor 1 and a first control valve 6, the compressor 1 includes an inlet 1a and an air supply port 1c, and the first control valve The valve 6 is provided on the connection passage between the inlet 1a and the air supply port 1c.

Among them, the refrigerant circulation system has a first heating mode. In the first heating mode, the first control valve 6 is opened, and the air supply port 1c, the first control valve 6 and the inlet 1a are connected in sequence to form a first self-circulation passage. The refrigerant circulates in the first self-circulation passage to increase the internal temperature of the compressor 1 .

In the above embodiment, by setting the first self-circulation passage, the heating function of the compressor can be realized through the self-circulation of part of the pipeline of the outdoor unit when the indoor unit is kept in a non-working state, and the internal temperature of the compressor can be effectively increased , which can quickly drive the flow of the liquid refrigerant remaining in the outdoor heat exchanger and other components, so that the time for the refrigerant circulation system to start heating can be shortened when the outdoor temperature is low, the user is accustomed to shutting down at night, or the refrigerant circulation system is placed for a long time. It is also beneficial to protect the compressor and improve the service life of the compressor.

In some embodiments, the refrigerant circulation system further includes a first expansion valve 5 , and the first expansion valve 5 is disposed on the connection passage between the air supply port 1 c and the first control valve 6 . By providing the first expansion valve 5, it can be used to change the state of the refrigerant in the first self-circulation passage.

In some embodiments, the refrigerant circulation system further includes a gas-liquid separator 9 , and the outlet of the gas-liquid separator 9 communicates with the inlet 1a of the compressor 1 . In the first self-circulation passage, the air supply port 1c, the first expansion valve 5, the first control valve 6, the gas-liquid separator 9 and the inlet 1a are communicated in sequence.

In some embodiments, the refrigerant circulation system further includes an outdoor heat exchanger 3 and a gas-liquid separator 9, and the compressor further includes an outlet 1b. In the first heating mode, the outlet 1b, the outdoor heat exchanger 3, and the first control valve 6 , The gas-liquid separator 9 and the inlet 1a are connected in sequence to form a second self-circulation passage.

By providing the second self-circulation passage, the flow rate for heating the compressor 1 can be increased, and the temperature increase rate of the compressor 1 can be increased.

In some embodiments, the refrigerant circulation system further includes an indoor heat exchanger 2 and a subcooler 4, the subcooler 4 is connected between the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the subcooler 4 is connected to the compressor The air supply port 1c and the inlet 1a of 1 are communicated respectively.

In some embodiments, the refrigerant circulation system further includes a second expansion valve 7 , and the second expansion valve 7 is disposed on the connection passage between the subcooler 4 and the indoor heat exchanger 2 .

In some embodiments, the refrigerant circulation system further includes a power supply, the compressor 1 includes a rotor and a stator, and the refrigerant circulation system has a second heating mode. In the second heating mode, the power supply is in electrical communication with the stator, and the windings of the stator are energized and energized. Heat is dissipated to increase the internal temperature of the compressor 1 .

By setting the power supply, the windings of the stator can be energized when the rotor does not move, so that the windings of the stator can dissipate heat to heat the compressor 1 .

In some embodiments, the refrigerant circulation system further includes a control device 11, the control device 11 is signally connected to the first control valve 6 and the power supply, and the control device 11 is used to adjust the refrigerant circulation system to the first heating mode or the second heating mode .

In some embodiments, the refrigerant circulation system further includes a heating belt, the heating belt is wrapped around the outer periphery of the part to be heated in the refrigerant circulation system, the refrigerant circulation system has a third heating mode, and in the third heating mode, the heating belt is activated to pass The heating belt heats the part to be heated.

By setting the heating belt, the part to be heated can be heated, thereby increasing the internal temperature of the compressor.

In some embodiments, the part to be heated includes the bottom of the compressor 1; or, the refrigerant circulation system further includes an oil-gas separator 10 that communicates with the outlet 1b, and the part to be heated includes the bottom of the oil-gas separator 10; or, the refrigerant circulation system further includes The gas-liquid separator 9 communicated with the inlet 1a is included, and the part to be heated includes the bottom of the gas-liquid separator 9 .

As shown in FIG. 1 , the heating belt includes a first heating belt 81 , a second heating belt 82 and a third heating belt 83 , the first heating belt 81 is wrapped around the bottom periphery of the compressor 1 , and the second heating belt 82 is wrapped around the gas-liquid On the outer periphery of the bottom of the separator 9 , the third heating belt 83 is wrapped around the outer periphery of the bottom of the oil-gas separator 10 .

The first heating belt 81 can directly heat the compressor 1, increase the internal temperature of the compressor 1, accelerate the vaporization of the liquid refrigerant inside the compressor 1, and improve the heating speed of the refrigerant circulation system. The bottom of the gas-liquid separator 9 can be heated by the second heating belt 82 , which is beneficial to accelerate the flow of the refrigerant remaining in the gas-liquid separator 9 , thereby accelerating the flow of the refrigerant in the compressor 1 and increasing the internal temperature of the compressor 1 . . The bottom of the oil-gas separator 10 can be heated by the third heating belt 83 , which is beneficial to accelerate the flow of the refrigerant remaining in the oil-gas separator 10 , thereby accelerating the flow of refrigerant in the compressor 1 and increasing the internal temperature of the compressor 1 .

In some embodiments, the refrigerant circulation system further includes a control device 11, the control device 11 is signally connected with the first expansion valve 5, the first control valve 6, the second expansion valve 7 and the heating belt, and the control device 11 is used for circulating the refrigerant The system adjusts to either the first heating mode or the third heating mode.

In some embodiments, the refrigerant circulation system further includes a control device 11 and a heating belt, the heating belt is wrapped around the outer periphery of the part to be heated in the refrigerant circulation system, the refrigerant circulation system has a third heating mode, and in the third heating mode, the heating belt Start, to heat the part to be heated by the heating belt, the control device 11 is connected with the first control valve 6, the power supply and the heating belt signal, and the control device 11 is used to adjust the refrigerant circulation system to the first heating mode and the second heating mode or the third heating mode.

In some embodiments, the first heating mode and the third heating mode can be turned on at the same time, or the second heating mode and the third heating mode can be turned on at the same time. Although the first heating mode and the second heating mode cannot be used at the same time, they can be used at intervals . Using two modes to heat the compressor 1 at the same time can effectively improve the heating efficiency, and can more effectively shorten the time for the refrigerant circulation system to start heating.

Based on the refrigerant circulation systems in the above embodiments, the present invention further provides an air-conditioning unit, which includes the above-mentioned refrigerant circulation system.

The control flow of the refrigerant circulation system provided by the utility model includes:

Detect the internal temperature of compressor 1;

According to the internal temperature of compressor 1, select the heating mode;

When the selected heating mode is the first heating mode, the first control valve 6 is opened, so that the air supply port 1c, the first expansion valve 5, the first control valve 6 and the inlet 1a are connected in sequence to form a first self-circulation passage, and the refrigerant circulates The refrigerant in the system circulates in the first self-circulation passage.

In some embodiments, the control flow further includes:

To provide a power supply, the compressor 1 includes a rotor and a stator;

When the selected heating mode is the second heating mode, the power supply is in electrical communication with the stator, the windings of the stator are energized and heat is dissipated, so as to increase the internal temperature of the compressor 1 .

In some embodiments, the control flow further includes:

Provide a heating belt, which is wrapped around the periphery of the part to be heated in the refrigerant circulation system;

When the selected heating mode is the third heating mode, the heating belt is activated, and the part to be heated is heated by the heating belt.

In some embodiments, according to the internal temperature of the compressor 1, the operation of selecting the heating mode includes:

Determine whether the internal temperature of the compressor 1 satisfies the first preset condition;

When the internal temperature of the compressor 1 satisfies the first preset condition, the second heating mode and the third heating mode are activated;

If the first preset condition is not met, continue to judge whether the internal temperature of the compressor 1 meets the second preset condition;

If the second preset condition is satisfied, the first heating mode and the third heating mode are activated.

In some embodiments, the first preset condition includes: in the continuous time of t2, the internal temperature of the compressor 1 is greater than or equal to T2, and less than T1; the second preset condition includes: in the continuous time of t3, the compression The internal temperature of machine 1 is less than T2, where t1<t2<t3, T1>T2.

In some embodiments, before judging whether the internal temperature of the compressor 1 satisfies the first preset condition, according to the internal temperature of the compressor 1, the operation of selecting the heating mode further includes:

Determine whether the refrigerant circulation system satisfies the third preset condition;

When the refrigerant circulation system meets the third preset condition, start the preheating function;

After the preheating function is turned on, determine whether the internal temperature of the compressor 1 meets the fourth preset condition;

If the internal temperature of the compressor 1 satisfies the fourth preset condition, no heating mode will be activated; if the internal temperature of the compressor 1 does not meet the fourth preset condition, enter the process of judging whether the internal temperature of the compressor 1 satisfies the first preset condition Conditional steps.

In some embodiments, the refrigerant circulation system includes a photovoltaic power generation device 12 that provides power, and the third preset condition includes: the refrigerant circulation system is powered on for the first time or has been powered on and the standby time exceeds t0, and the generated voltage of the photovoltaic power generation device 12 is not less than a preset value The voltage value; the fourth preset condition includes: the internal temperature of the compressor 1 is not less than T1 during the continuous time of t1.

In some embodiments, the preset voltage value may be 90% of the voltage required when the first heating mode, the second heating mode or the third heating mode is activated.

In some embodiments, according to the internal temperature of the compressor 1, the operation of selecting the heating mode further includes:

After starting the first heating mode and the third heating mode, determine whether the internal temperature of the compressor 1 satisfies the fifth preset condition;

When the internal temperature of the compressor 1 satisfies the fifth preset condition, the preheating function is turned off.

In some embodiments, the fifth preset condition includes:

When the working time of the first heating mode and the third heating mode reaches t4, the difference between the internal temperature of the compressor 1 and the outdoor ambient temperature is greater than T3; or

During the continuous time of t4, the internal temperature of the compressor 1 is not less than T4.

In some embodiments, in the second heating mode, the control flow further includes:

When the refrigerant circulation system is in the standby state, the heating demand of the indoor unit is zero, and the continuous shutdown time of the compressor 1 is less than t5, the electrical connection between the power supply and the stator is disconnected;

When the refrigerant circulation system is in the standby state, the internal temperature of the compressor 1 is greater than or equal to T5 and less than T6 within the continuous time of t6, and when the compressor 1 is powered on for the first time or has been powered on and the standby time exceeds t7, the power supply and the The stator is in electrical communication.

In some embodiments, in the second heating mode, the control flow further includes:

After starting the second heating mode, before measuring the internal temperature of the compressor 1 or when the difference between the internal temperature of the compressor 1 and the outdoor ambient temperature is not greater than T7, the energization current of the stator winding satisfies: A1=a*T0 ² +b*T0+c, where T0 is the outdoor ambient temperature, and a, b and c are constants;

When the difference between the internal temperature of the compressor 1 and the outdoor ambient temperature is greater than T7, the energization current of the stator windings satisfies: A2=A0*(1+d), where A0 is the current current size, and d is the current of the compressor 1. The amount of periodical change of the internal temperature, and d is a constant.

In each embodiment provided by the present invention, the internal temperature of the compressor 1 can be the temperature of the top of the compressor 1, and the top of the compressor 1 can more accurately reflect the actual temperature inside the compressor 1 and is convenient for measurement.

Below in conjunction with accompanying drawing 1 and 2, the working process of one embodiment of the utility model refrigerant circulation system and air-conditioning unit will be described:

As shown in Figure 1, the outdoor unit includes a compressor 1, an outdoor heat exchanger 3, a subcooler 4, a first expansion valve 5, a first control valve 6, a gas-liquid separator 9, an oil-gas separator 10, and a four-way valve 14. The third expansion valve 15 and the fourth expansion valve 16. The indoor unit includes a plurality of indoor heat exchangers 2 and a plurality of corresponding second expansion valves 7 . The outer periphery of the bottom of the compressor 1 is wrapped with a first heating belt 81 . The outer periphery of the bottom of the gas-liquid separator 9 is wrapped with a second heating belt 82 . The outer periphery of the bottom of the oil-gas separator 10 is wrapped with a third heating belt 83 . A second control valve 17 and a third control valve 18 are provided on the connecting pipeline between the indoor unit and the outdoor unit.

The air conditioning unit further includes a control device 11 , a photovoltaic power generation device 12 and a load 13 . The photovoltaic power generation device 12 may provide power for the air conditioning unit. The load 13 can be a component that is signally connected to the control device 11, and the control device 11 can electrically control these components. For example, the load 13 can be the first expansion valve 5, the second expansion valve 7, the third expansion valve 15, the fourth expansion valve The expansion valve 16, the first control valve 6, the second control valve 17, the third control valve 18, the first heating belt 81, the second heating belt 82, the third heating belt 83, and the like.

In this embodiment, the compressor 1 is an enthalpy injection scroll compressor, and a middle pressure enthalpy injection port is provided in the middle position of the stationary scroll. Through the air supply port 1c, a part of the intermediate pressure gas can be inhaled, and the partially compressed gas can be inhaled. The refrigerant is mixed and recompressed, and a single compressor realizes two-stage compression, which increases the refrigerant flow in the condenser and increases the enthalpy difference of the main circulation loop, thereby greatly improving the efficiency of the compressor.

The stator winding of the compressor can also be energized with excitation current, that is, when the rotor is not rotating, the stator can generate electromagnetic heat by energizing the stator winding to heat the internal temperature of the compressor.

When the stator heating and the heat generation of the heating belt are relatively slow, the compressor 1 can be started, and the internal refrigerant circulation can generate heat through the first self-circulation passage and the second self-circulation passage to realize the heating of the compressor 1 .

As shown in FIG. 1 , when the first heating mode is turned on, the first expansion valve 5 is opened to the maximum opening; the first control valve 6 is in a power-on state, that is, an open state; the four-way valve 14 is in a power-off state, that is, closed state; the third expansion valve 15 and the fourth expansion valve 16 are opened to the maximum opening degree; the opening degree of the second expansion valve 7 is opened to zero. Compressor 1 can run at H1 by default. When compressor 1 is in a continuous period of time, the detected temperature of the high-pressure sensor is not less than X1 or the detected temperature of the low-pressure sensor is not greater than X2, then the operating frequency of compressor 1 decreases ΔH each time, But the minimum operating frequency is not lower than H1.

The path of the first self-circulation path is:

It is ejected from the supplemental air inlet 1c of the compressor 1, to the first expansion valve 5, to the first control valve 6, to the gas-liquid separator 9, and finally to the suction port of the compressor 1.

The path of the second self-circulation path is:

From the exhaust port of the compressor, it goes to the four-way valve 14, to the outdoor heat exchanger 3, then to the fourth expansion valve 16, through the cooler 4 to the first control valve 6, and then to the gas-liquid separator 9, Finally to the suction port of compressor 1.

When controlling the air-conditioning unit, the first heating mode, the second heating mode or the third heating mode can be used alone, or the combined mode of the first heating mode, the second heating mode and the third heating mode can be used, and the combined mode includes the first heating mode, the second heating mode and the third heating mode. A combination of a heating mode and a second heating mode, a combination of a first heating mode and a third heating mode, a combination of a second heating mode and a third heating mode, and a combination of the first heating mode, the second heating mode and the third heating mode combination. The first heating mode and the third heating mode can be turned on at the same time, and the second heating mode and the third heating mode can also be turned on at the same time. Although the first heating mode and the second heating mode cannot be turned on at the same time, they can be turned on at intervals.

For example, in one embodiment, the second heating mode and the third heating mode can be activated at the same time, which can effectively improve the heating efficiency through dual heat source heating, and heat the refrigerant stored at the bottom of the compressor 1 and separate it from the oil; then , in the default time, if the heating effect is not obvious, you can turn off the second heating mode, start the first heating mode, the heat generated by the compressor self-circulation heating is higher than the stator heating, at this time through the first heating mode and the third heating mode Heating mode dual heat source heating can further increase the heating temperature. The principle of self-circulation heating of the compressor is consistent with the principle of vapor compression refrigeration, that is, part of the condensation heat is generated by the power consumption of the motor, and the other part is generated by the compression of the gas.

The working process of this embodiment is described below:

Referring to Figure 2, when the air conditioner is powered on for the first time or has been powered on and the standby time exceeds t0, and the photovoltaic power generation device 12 generates a voltage not less than 90% of the required voltage when the first heating mode, the second heating mode or the third heating mode is started %, start the preheating function;

After the preheat function is turned on:

1. If the temperature of the top of the compressor 1 is not less than T1 during the continuous time of t1, no heating mode will be activated;

2. If the temperature of the top of the compressor 1 is greater than or equal to T2 and less than T1 within the continuous time of t2, the second heating mode and the third heating mode are activated at the same time;

3. If the temperature of the top of the compressor 1 is lower than T2 in the continuous time of t3, the first heating mode and the third heating mode are activated at the same time.

When the air conditioning unit meets either of the following two conditions, the preheating function is turned off:

1 When the working time of the first heating mode and the third heating mode reaches t4, the difference between the top temperature of the compressor 1 and the outdoor ambient temperature is greater than T3;

2. During the continuous time of t4, the temperature of the top of the compressor 1 is not less than T4.

Among them, as shown in Figure 3, the control principle of the second heating mode is:

After entering the control flow of the second heating mode, when the air conditioning unit is in the standby state, the heating demand of the indoor unit is zero, and the continuous shutdown time of the compressor 1 is less than t5, the electrical connection between the power supply and the stator is made. Disconnected, that is, the second heating mode is off;

When the air-conditioning unit is in the standby state, the top temperature of the compressor 1 is greater than or equal to T5 and less than T6 within the continuous time of t6, and when the compressor 1 is powered on for the first time or has been powered on and the standby time exceeds t7, the power supply and the stator are connected. Electrical connection initiates the second heating mode.

After starting the second heating mode, before measuring the internal temperature of the compressor 1 or when the difference between the top temperature of the compressor 1 and the outdoor ambient temperature is not greater than T7, the energization current of the stator winding satisfies: A1=a*T0 ² +b*T0+c, where T0 is the outdoor ambient temperature, a, b and c are all constants, for example, a=0.03, b=0.07, c=15;

When the difference between the top temperature of compressor 1 and the outdoor ambient temperature is greater than T7, the energization current of the stator winding satisfies: A2=A0*(1+d), where A0 is the current current size, and d is the current of compressor 1. Periodic transformation of the internal temperature, and d is a constant, such as d=0.1.

Through the description of the various embodiments of the refrigerant circulation system and the air conditioning unit of the present invention, it can be seen that the compressor preheating control function is added to the embodiment of the refrigerant circulation system and the air conditioning unit of the present invention, which can effectively improve the reliability and use of the compressor. life.

The air-conditioning unit provided by the utility model can be multi-connected, such as photovoltaic multi-connected, or can be a unit with other structures. Since the photovoltaic power comes from the sun, the photovoltaic multi-line can use the photovoltaic power to maintain its own operation and realize the preheating function without consuming the power of the grid. Using the preheating function of the photovoltaic multi-line itself can improve the reliability of the whole machine, prolong the service life of the compressor, and speed up the time to achieve the heating effect at low temperature.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limit them; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: Under the premise of not departing from the principles of the present invention, the specific embodiments of the present invention can still be modified or some technical features can be equivalently replaced, and these modifications and equivalent replacements should all be included in the scope of the technical solutions claimed by the present invention.

Claims (10)

1. a refrigerant circulation system, is characterized in that, comprises: a compressor (1), including an inlet (1a) and a supplemental air port (1c); and a first control valve (6), arranged on the connection passage between the inlet (1a) and the air supply port (1c); Wherein, the refrigerant circulation system has a first heating mode, and in the first heating mode, the first control valve (6) is opened, the air supply port (1c), the first control valve (6) Connect with the inlet (1a) in sequence to form a first self-circulation passage. 2 . The refrigerant circulation system according to claim 1 , further comprising a first expansion valve ( 5 ) disposed between the air supply port ( 1 c ) and the first control valve ( 6 ). 3 . 3. The refrigerant circulation system according to claim 1, characterized in that it further comprises an outdoor heat exchanger (3) and a gas-liquid separator (9), and the compressor (1) further comprises an outlet (1b), where In the first heating mode, the outlet (1b), the outdoor heat exchanger (3), the first control valve (6), the gas-liquid separator (9) and the inlet (1a) They are connected in sequence to form a second self-circulation passage. 4. The refrigerant circulation system according to any one of claims 1 to 3, characterized in that it further comprises a power supply, the compressor (1) comprises a rotor and a stator, and the refrigerant circulation system has a second heating mode, In the second heating mode, the power supply is in electrical communication with the stator to energize the windings of the stator and dissipate heat. 5 . The refrigerant circulation system according to claim 4 , further comprising a control device ( 11 ), the control device ( 11 ) being signally connected to the first control valve ( 6 ) and the power supply source, 5 . The control device (11) is used to adjust the refrigerant circulation system to the first heating mode or the second heating mode. 6 . The refrigerant circulation system according to claim 1 , further comprising a heating belt, the heating belt is wrapped around the outer periphery of the to-be-heated part of the refrigerant circulation system, and the refrigerant circulation system has a third heating mode. 7 . , in the third heating mode, the heating belt is activated to heat the portion to be heated by the heating belt. 7. The refrigerant circulation system according to claim 6, characterized in that, the part to be heated comprises the bottom of the compressor (1); The oil and gas separator (10) communicated with the outlet (1b) of the oil and gas separator (10), the part to be heated includes the bottom of the oil and gas separator (10); A liquid separator (9), the part to be heated includes the bottom of the gas-liquid separator (9). 8 . The refrigerant circulation system according to claim 6 , further comprising a control device ( 11 ), the control device ( 11 ) being signally connected to the first control valve ( 6 ) and the heating belt, 8 . The control device (11) is used to adjust the refrigerant circulation system to a first heating mode or a third heating mode. 9 . The refrigerant circulation system according to claim 4 , further comprising a control device ( 11 ) and a heating belt, the heating belt is wrapped around the outer periphery of the part to be heated in the refrigerant circulation system, and the refrigerant circulates The system has a third heating mode, and in the third heating mode, the heating belt is activated to heat the part to be heated by the heating belt, and the control device (11) is connected with the first control device The valve (6), the power supply and the heating belt are signally connected, and the control device (11) is used to adjust the refrigerant circulation system to a first heating mode, a second heating mode or a third heating mode. 10. An air conditioning unit, characterized by comprising the refrigerant circulation system according to any one of claims 1 to 9.

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