CN111637585A - Refrigerant regulation method, refrigerant regulation system and air conditioner used in air conditioning cooling or heating mode - Google Patents

Abstract

The present invention relates to a refrigerant regulation method, a refrigerant regulation system and an air conditioner used in the cooling or heating mode of an air conditioner. The present invention can determine whether the current operation needs to start the refrigerant adjustment based on the consistency judgment between the current operation mode and the previous operation mode, avoids the redundant action of the refrigerant adjustment to zero, and improves the effect of the refrigerant adjustment on the refrigeration/control system. Thermal mode response efficiency. Further, the present invention can also solve the problem of inconsistent refrigerant filling amount required for the best performance point of the heat pump air-conditioning system in the cooling and heating modes, so that the performance of the air-conditioning system can be optimized in both cooling and heating; The quality of the refrigerant actually participating in the cycle when the air conditioner is cooling and heating, so that the quality of the refrigerant actually participating in the cycle when the air conditioner is cooling and heating is at the optimal value.

Description

Refrigerant regulation method and refrigerant regulation for use in air conditioning cooling or heating mode Systems and Air Conditioning

technical field

The present application relates to the technical field of air conditioners, and in particular, to a refrigerant adjustment method, a refrigerant adjustment system, and an air conditioner used in a cooling or heating mode of an air conditioner.

Background technique

With the depletion of fossil energy and the increasing global greenhouse effect, people's awareness of energy conservation is increasing day by day. As a common household electrical appliance, room air conditioners have the characteristics of wide popularity, long use time, high operating power consumption, and large power consumption. global warming effect. Therefore, improving the energy efficiency ratio of air conditioners is an important direction for the progress of air conditioner technology.

On the one hand, when the air conditioner operates in the cooling or heating mode, it is usually necessary to adopt different refrigerant regulation strategies, such as recovering the refrigerant in the cooling mode and releasing the refrigerant in the heating mode. Therefore, it can be understood that the refrigerant adjustment is performed in response to the cooling/heating mode of the air conditioner. However, in the prior art, when the current air conditioner operates in the cooling or heating mode, the influence of the last air conditioner operation mode on the current operation is often not considered. And when the last air conditioning operation ends, the traditional method is to return the refrigerant adjustment to an initial state (or return to zero), which is between the refrigerant adjustment during cooling and the refrigerant adjustment during heating. state, so that when the current air conditioner is running, the refrigerant adjustment process starts from this initial state (taking it as the starting point), and in response to the instruction that the air conditioner needs to operate in the cooling or heating mode, the corresponding refrigerant adjustment process is carried out. . In this way, every time the air conditioner finishes cooling or heating or before the next operation starts, it needs to go through a process of adjusting the refrigerant to zero, resulting in unreasonable situations such as redundant occupancy in the refrigerant adjustment process, and leading to refrigeration The response efficiency of the agent adjustment to the cooling/heating mode is reduced.

On the other hand, the optimal value of the refrigerant charge required by the heat pump room air conditioner is not the same when it operates in the cooling and heating modes. Usually, the optimal refrigerant charge required by the air conditioner is in the cooling mode. The value is less than the optimal value of the refrigerant injection amount required for running the heating mode. The air-conditioning system designer usually takes a compromise value for the refrigerant injection amount during the development and debugging stage of the air conditioner to ensure the energy efficiency ratio of the air conditioner during cooling. It will not be too low, and it has a higher capacity when heating, but this approach also leads to the fact that the air conditioner cannot achieve the best energy efficiency when cooling, and cannot exert its maximum capacity when heating.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a refrigerant regulation system and an air conditioner for air conditioners, so as to overcome the shortcomings of the prior art, such as the unreasonable response process and low response efficiency of the refrigerant regulation process to the currently operating cooling/heating mode, and further Solve the problem of inconsistent refrigerant injection volume required for the optimal performance point of heat pump air conditioners in cooling and heating modes.

To this end, according to a first aspect of the present application, there is provided a refrigerant adjustment method for an air conditioner in a cooling or heating mode, the air conditioner comprising a refrigerant storage tank (1), the refrigerant storage tank (1) A refrigerant circulation passage connected to the air conditioner in a controllable open-close manner; characterized in that, the method includes:

Determine whether the last operating mode of the air conditioner is the cooling or heating mode;

Determine whether the current operation mode of the air conditioner is the cooling or heating mode;

During this operation, if the current operation mode is consistent with the last operation mode, the connection between the storage tank and the circulation passage is closed; if the current operation mode is the same as the last operation mode If they are inconsistent, the connection between the storage tank and the circulation passage is conducted, so that the storage tank can participate in the recovery or release of the refrigerant in the circulation passage.

In this way, the present application can determine whether the refrigerant adjustment needs to be started in the current operation based on the consistency judgment between the current operation mode and the previous operation mode, avoiding the redundant action of zeroing the refrigerant adjustment, and improving the refrigerant adjustment Response efficiency to cooling/heating mode.

Further, the judging that the last operating mode of the air conditioner is the cooling or heating mode includes:

When the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured to be the configured amount of the air conditioner operating in the cooling or heating mode;

And when the air conditioner operates for the first time, the last operation mode is determined to be the cooling or heating mode corresponding to the refrigerant configuration amount at the factory.

In this way, the present application adopts the configuration amount of the refrigerant in the storage tank and the passage from the factory to the configuration amount in the cooling or heating mode of the air conditioner, thereby overcoming the problem of the lack of the condition of the previous operation mode when the air conditioner is operated for the first time, so that the The air conditioner can be seamlessly connected to the process of adopting the corresponding refrigerant adjustment strategy based on the mode judgment of the present application from the first operation.

Further, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured to be the configured amount of the air conditioner operating in the cooling or heating mode, including:

When the configuration is the configuration amount of the air conditioner operating in the cooling mode, the configuration amount of the refrigerant in the circulation passage is m1;

When the configuration is the configuration amount that the air conditioner operates in the heating mode, the configuration amount of the refrigerant in the circulation passage is m2;

Wherein, m1 is the optimal refrigerant circulation quality required when the air conditioner operates in the cooling mode, and m2 is the optimal refrigerant circulation quality required when the air conditioner operates in the heating mode.

In this way, the present application can configure the refrigerant quality to meet the optimal value required by the cooling or heating mode at the time of delivery, so that the process of adopting the corresponding refrigerant adjustment strategy based on the mode judgment of the present application can use the optimal value As the starting point, in the cycle process of the subsequent adjustment strategy, the quality of the refrigerant actually participating in the cycle during the cooling and heating of the air conditioner is always adjusted to the optimal value.

Further, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured to be the configuration amount of the air conditioner operating in the cooling mode, and the configuration amount of the refrigerant in the circulation passage is m1, and the The configuration of the refrigerant in the storage tank is m3=m2-m1+mx, where mx takes a value greater than zero and when the air conditioner operates in the cooling or heating mode, the pressure in the storage tank is higher or lower than the cooling respectively. condensing pressure of the agent.

In this way, by configuring the residual refrigerant mass mx in the storage tank in the heating mode, the present application helps to ensure that when the air conditioner operates in the cooling or heating mode, the pressure in the storage tank is respectively higher or lower than the condensing pressure of the refrigerant. , so as to ensure the smooth progress of the refrigerant recovery and release process. In addition, since mx can be configured according to the above conditions, the filling amount is not unique, it can be applied to more scenarios, and the project development cycle can be shortened; and it can ensure that there is a certain amount of refrigerant in the tank, which can overcome the cooling after long-term operation to a certain extent. Solvent leakage and other problems, thus avoiding the problem of after-sales filling to a certain extent, so that the air conditioner can be in the best refrigerant quantity state for a longer time.

Further, making the connection between the storage tank and the circulation passage conduct, so that the storage tank can participate in the recovery or release of the refrigerant in the circulation passage, includes:

When the air conditioner operates in the cooling mode, the inflow of the refrigerant recovery from the circulation passage to the storage tank is monitored, so that when the quality of the refrigerant remaining in the circulation passage is the optimum refrigerant required in the cooling mode When the circulation quality is high, the connection between the storage tank and the circulation passage is closed;

When the air conditioner operates in the heating mode, the outflow amount of the refrigerant released from the storage tank to the circulation passage is monitored, so that when the quality of the refrigerant remaining in the circulation passage is the optimum required in the heating mode When the refrigerant circulation quality is high, the connection between the storage tank and the circulation passage is closed.

In this way, the present application solves the problem of inconsistency in the amount of refrigerant required for the optimal performance point of the heat pump air conditioning system in the cooling and heating modes, so that the performance of the air conditioning system can be optimized in both cooling and heating; The quality of the refrigerant that actually participates in the cycle during cooling and heating, so that the quality of the refrigerant actually participating in the cycle during air conditioning cooling and heating is at the optimal value.

Further, the method also includes:

When the air conditioner operates in a cooling mode, the refrigerant storage tank (1) is positioned on the high pressure side of the circulation passage;

When the air conditioner operates in a heating mode, the refrigerant storage tank (1) is placed on the low pressure side of the circulation passage.

In this way, by placing the refrigerant storage tank on the high pressure side or the low pressure side in the cooling or heating mode, the present application can help to ensure that when the air conditioner operates in the cooling or heating mode, the pressure in the storage tank is respectively higher or lower than that of the cooling Condensation pressure of the refrigerant, so as to ensure the smooth progress of the refrigerant recovery and release process.

According to a second aspect of the present invention, there is provided a refrigerant regulation system for air conditioners, the regulation system applies the above regulation method, and is characterized in that: the regulation system comprises the refrigerant storage tank (1), a connection A pipe and a solenoid valve device, the solenoid valve device is arranged in the connecting pipe, and the refrigerant storage tank (1) is connected to the connecting pipe and the solenoid valve device in a controllable opening and closing manner circulation pathway.

Further, the air conditioner includes an outdoor unit heat exchanger (3), and the storage tank is respectively connected to both sides of the outdoor unit heat exchanger (3) through the connecting pipe; the solenoid valve device includes a normally closed Solenoid valves A and B are respectively arranged in the connecting pipes connected on the two sides;

In addition, when both the normally closed solenoid valves A and B are closed, the connection between the storage tank and the circulation passage is closed; when at least one of the normally closed solenoid valves A and B is turned on, the storage tank is closed. The connection between the tank and the circulation passage is conducted.

In this way, the simple configuration of the parallel connection between the refrigerant storage tank and the heat exchanger of the outdoor unit of the air conditioner in the present application can make use of the difference between the pressure of the outdoor heat exchanger and the connecting pipelines at both ends during the cooling and heating of the air conditioner and the pressure in the storage tank. , recovery and release of refrigerant, has the advantages of simple structure, simple control logic, stable operation and high reliability.

Further, the solenoid valves located upstream of the refrigerant circulation flow in the normally closed solenoid valves A and B are turned on, and the solenoid valve located downstream of the refrigerant circulation flow is closed, so that the storage tank and the circulation passage are connected. The connection is turned on.

In this way, the present application can avoid the system cooling efficiency caused by the refrigerant passing through the outdoor unit heat exchanger or not passing through the outdoor unit heat exchanger before or after the refrigerant flows into or out of the storage tank in the cooling or heating mode. lowering problem.

Further, the adjustment system further includes a flow meter arranged in the storage tank or in the flow path that the refrigerant must pass through when entering and leaving the storage tank, so as to:

When the air conditioner operates in the cooling mode, the flowmeter monitors the refrigerant recovery inflow Δm=m2-m1 of the storage tank from the circulation passage, and closes the connection between the storage tank and the circulation passage ;

When the air conditioner operates in the heating mode, when monitoring the outflow of refrigerant from the storage tank to the circulation passage Δm'=m2-m1, the connection between the storage tank and the circulation passage is closed;

Wherein, m1 is the optimal refrigerant circulation quality required when the air conditioner operates in the cooling mode, and m2 is the optimal refrigerant circulation quality required when the air conditioner operates in the heating mode.

In this way, the present application can precisely control the adjustment of the refrigerant, and by changing the quality of the refrigerant that actually participates in the cycle during cooling and heating, the quality of the refrigerant actually participating in the cycle during cooling and heating of the air conditioner is at The optimal value.

According to a third aspect of the present invention, there is provided an air conditioner, characterized in that the air conditioner is a heat pump type air conditioner using compressed vapor refrigeration, and the air conditioner has the refrigerant conditioning system as described above.

In this way, when the refrigerant conditioning system of the present application is applied to the air conditioner, the quality of the refrigerant participating in the refrigeration cycle is reduced, and under the same cooling capacity and the same working conditions, the evaporating pressure of the refrigerant in the heat exchanger of the indoor unit remains unchanged, and the heat exchange of the outdoor unit The condensing pressure of the refrigerant in the compressor decreases (need to adjust the throttling device accordingly, such as shortening the refrigeration capillary, increasing the opening of the electronic expansion valve, etc.), that is, the compressor discharge pressure decreases, and the suction pressure remains unchanged, so the compression ratio decreases. Small. The suction pressure of the compressor remains unchanged, and the exhaust temperature decreases when the compression ratio decreases, and the compressor power and current decrease. When the exhaust temperature decreases and the current value decreases, the compressor will only enter the overload protection at a higher outdoor ambient temperature, that is, the tripping temperature will be higher, thereby improving the reliability of the air conditioner.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

FIG. 1 is a schematic flowchart of a method for adjusting a refrigerant in an air conditioner cooling or heating mode of the present application.

FIG. 2 is a schematic diagram of the structure of the refrigerant conditioning system for air conditioners of the present application and the refrigerant flow in cooling and heating modes.

Description of reference numbers:

1-refrigerant storage tank; 2-throttle device; 3-outdoor unit heat exchanger; 4-indoor unit heat exchanger; 5-four-way valve; 6-compressor; 7-vapor-liquid separator; 8-split device; 9-normally closed solenoid valve A; 10-normally closed solenoid valve B.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the embodiments of this application, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, the phrases "if determined" or "if detected (the stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (the stated condition or event)," depending on the context )" or "in response to detection (a stated condition or event)".

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a commodity or system comprising a list of elements includes not only those elements, but also includes not explicitly listed other elements, or elements inherent to the commodity or system. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the article or system that includes the element.

Referring to FIGS. 1 and 2 , they respectively indicate a flow chart of a non-limiting embodiment of the method for adjusting refrigerant in an air conditioning cooling or heating mode of the present application and a schematic diagram of a refrigerant adjusting system architecture. Wherein, the air conditioner includes a refrigerant storage tank 1, and the refrigerant storage tank 1 is connected to a refrigerant circulation passage of the air conditioner in a controlled opening and closing manner.

Referring to accompanying drawing 1, the refrigerant regulation method of the present application includes:

Determine whether the last operating mode of the air conditioner is the cooling or heating mode;

Determine whether the current operation mode of the air conditioner is the cooling or heating mode;

During this operation, if the current operation mode is consistent with the last operation mode, the connection between the storage tank and the circulation passage is closed; if the current operation mode is inconsistent with the last operation mode, the connection between the storage tank and the circulation passage so that the storage tank can participate in the recovery or release of the refrigerant in the circulation path.

In this way, the present application can determine whether the refrigerant adjustment needs to be started in the current operation based on the consistency judgment between the current operation mode and the previous operation mode, avoiding the redundant action of zeroing the refrigerant adjustment, and improving the refrigerant adjustment Response efficiency to cooling/heating mode.

Specifically in this embodiment, the adjustment method of the present application includes at least three situations: "the last operation mode was heating", "the last operation mode was cooling", and "the last operation was the first operation of the air conditioner" (see appendix figure 1).

(1) The last operating mode was heating

When it is judged that the last operation mode is heating, it is further judged whether the current air conditioner operation mode is cooling or heating;

If it is determined that the current air conditioner operation mode is heating, the connection between the storage tank and the circulation passage is closed (for example, the normally closed solenoid valves A and B in Figure 2 are closed), and the air conditioner operates normally in the heating mode. At this time, since the connection between the storage tank and the circulation passage is kept closed (the connection between the storage tank and the circulation passage is closed after the last operation of the heating mode), the storage tank is in the normal operation of the heating mode this time. The amount of refrigerant in the circulation passage is the same as the amount when the heating mode was operated last time, so there is no need to perform additional adjustment actions of the refrigerant, thus avoiding the redundant action of adjusting the refrigerant to zero, and improving the effect of refrigerant adjustment on cooling. / Response efficiency in heating mode.

If it is judged that the current air conditioning operation mode is cooling, since the optimal demand for the refrigerant participating in the cycle is different in the cooling and heating modes of the air conditioner, it is necessary to perform a refrigerant adjustment action, so that the storage tank and the circulation passage are connected. Conduction (for example, make any one of the normally closed solenoid valves A and B in FIG. 2 conduct), so that the storage tank can recover the refrigerant in the circulation passage.

(2) The last operating mode was cooling

When it is judged that the last operation mode is cooling, it is further judged whether the current operation mode of the air conditioner is cooling or heating;

If it is determined that the current air conditioner operation mode is cooling, the connection between the storage tank and the circulation passage is closed (for example, the normally closed solenoid valves A and B in Figure 2 are closed), and the air conditioner operates normally in the cooling mode. At this time, since the connection between the storage tank and the circulation passage is kept closed (the connection between the storage tank and the circulation passage is closed after the last operation of the refrigeration mode), the internal and external circulation of the storage tank and the circulation passage during the normal operation of the refrigeration mode this time The amount of refrigerant in the passage is equal to the amount when the cooling mode was operated last time, so there is no need to perform additional adjustment actions of the refrigerant, thus avoiding the redundant action of refrigerant adjustment to zero, and improving the effect of refrigerant adjustment on cooling/heating. Mode response efficiency.

If it is judged that the current air conditioning operation mode is heating, since the optimal demand for the refrigerant participating in the circulation of the air conditioner is different in the cooling and heating modes, it is necessary to carry out the refrigerant adjustment action, so that the gap between the storage tank and the circulation passage is changed. The connection is turned on (for example, any one of the normally closed solenoid valves A and B in FIG. 2 is turned on), so that the storage tank can release the refrigerant into the circulation passage.

(3) The last operation is the first operation of the air conditioner

When the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured to the configuration amount of the air conditioner running in the cooling or heating mode;

And when the air conditioner operates for the first time, the last operation mode is judged as the cooling or heating mode corresponding to the refrigerant configuration amount at the factory.

As a non-limiting example, as shown in FIG. 1 , the last operation mode may be determined as the cooling mode corresponding to the refrigerant configuration amount at the factory. It should be noted that, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage can also be configured as the configured amount when the air conditioner operates in the heating mode. However, a more preferred method of the present application is to configure the amount of refrigerant in the storage tank and the circulation passage from the factory to the configuration amount of the air conditioner operating in the cooling mode during the hot season (such as summer or late spring and early autumn when the temperature is high). , in the cold season (such as winter or early spring and late autumn when the temperature is relatively low), configure the amount of refrigerant in the storage tank and the circulation passage from the factory to the configuration amount of the air conditioner operating in the heating mode. In this way, the user can directly enter the normal operation of the corresponding cooling or heating without additional adjustment of the refrigerant during the first startup operation, thereby reducing the waiting time of the user and improving the user experience.

In this way, the present application adopts the configuration amount of the refrigerant in the storage tank and the passage from the factory to the configuration amount in the cooling or heating mode of the air conditioner, thereby overcoming the problem of the lack of the condition of the previous operation mode when the air conditioner is operated for the first time, so that the The air conditioner can be seamlessly connected to the process of adopting the corresponding refrigerant adjustment strategy based on the mode judgment of the present application from the first operation.

Preferably, when the air conditioner operates in the cooling mode, the recovery inflow of the refrigerant from the circulation passage to the storage tank is monitored, so that when the quality of the refrigerant remaining in the circulation passage is the optimum refrigerant circulation quality m1 required in the cooling mode, Close the connection between the storage tank and the circulation passage;

When the air conditioner operates in the heating mode, monitor the outflow of the refrigerant from the storage tank to the circulation passage, so that when the quality of the refrigerant left in the circulation passage is the optimal refrigerant circulation quality m2 required in the heating mode, let The connection between the storage tank and the circulation path is closed.

It should be noted that, in the development stage of the air conditioner, the air conditioning system designer can determine the optimal values m1 and m2 of the refrigerant injection amount required for the cooling and heating of the air conditioner through experiments or calculation methods.

In this way, the present application solves the problem of inconsistency in the amount of refrigerant required for the optimal performance point of the heat pump air conditioning system in the cooling and heating modes, so that the performance of the air conditioning system can be optimized in both cooling and heating; The quality of the refrigerant that actually participates in the cycle during cooling and heating, so that the quality of the refrigerant actually participating in the cycle during air conditioning cooling and heating is at the optimal value.

Further preferably, a flow meter (not shown in the figure) can also be set in the storage tank or in the flow path that the refrigerant must pass through when entering and leaving the storage tank, so that:

When the air conditioner operates in cooling mode, the flowmeter monitors the refrigerant recovery inflow from the circulation passage to the storage tank Δm=m2-m1, and closes the connection between the storage tank and the circulation passage;

When the air conditioner operates in the heating mode, monitor the outflow of the refrigerant released from the storage tank to the circulation passage Δm'=m2-m1, close the connection between the storage tank and the circulation passage;

In this way, the present application can precisely control the adjustment of the refrigerant, and by changing the quality of the refrigerant that actually participates in the cycle during cooling and heating, the quality of the refrigerant actually participating in the cycle during cooling and heating of the air conditioner is at The optimal value.

Further considering the initialization of the air conditioner when it leaves the factory, when the air conditioner leaves the factory, when the amount of refrigerant in the storage tank and the circulation path is configured to the configuration amount of the air conditioner operating in the cooling mode, the configuration amount of the refrigerant in the circulation path is m1; When the configuration is the configuration amount of the air conditioner operating in the heating mode, the configuration amount of the refrigerant in the circulation passage is m2.

In this way, the present application can configure the refrigerant quality to meet the optimal value required by the cooling or heating mode at the time of delivery, so that the process of adopting the corresponding refrigerant adjustment strategy based on the mode judgment of the present application can use the optimal value As the starting point, in the cycle process of the subsequent adjustment strategy, the quality of the refrigerant actually participating in the cycle during the cooling and heating of the air conditioner is always adjusted to the optimal value.

As a preferred implementation of this embodiment, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation path can be configured to be the configuration amount when the air conditioner operates in the cooling mode, and the configuration amount of the refrigerant in the circulation path is m1 , the configuration of the refrigerant in the storage tank is m3=m2-m1+mx, where mx takes a value greater than zero and when the air conditioner operates in cooling or heating mode, the pressure in the storage tank is higher or lower than the condensation of the refrigerant, respectively. pressure.

In this way, by configuring the residual refrigerant mass mx in the storage tank in the heating mode, the present application helps to ensure that when the air conditioner operates in the cooling or heating mode, the pressure in the storage tank is respectively higher or lower than the condensing pressure of the refrigerant. , so as to ensure the smooth progress of the refrigerant recovery and release process. In addition, since mx can be configured according to the above conditions, the perfusion volume is not unique, it can be applied to more scenarios, and the project development cycle can be shortened; The problem of refrigerant leakage after the air conditioner has been used for many years), thus avoiding the problem of after-sales filling to a certain extent, and making the air conditioner in the best refrigerant quantity state for a longer time.

As a preferred implementation of this embodiment, when the air conditioner operates in the cooling mode, the refrigerant storage tank 1 is located at the high pressure side of the circulation passage; when the air conditioner operates in the heating mode, the refrigerant storage tank 1 is located at the low pressure side of the circulation passage. side.

Referring to FIG. 2 , one side of the outdoor unit heat exchanger 3 is connected to the four-way valve 5 , and the other side is connected to one side of the indoor unit heat exchanger 4 through the throttling device 2 and the flow dividing device 8 in sequence. In the four-way valve 5 , except one way is connected to the outdoor unit heat exchanger 3 , the other three ways are connected to the compressor 6 , the vapor-liquid separator 7 and the other side of the indoor unit heat exchanger 4 respectively.

When the air conditioner operates in the cooling mode or the heating mode, the four-way valve 5 is selectively opened and closed in different ways (refer to FIG. 2 , in the cooling mode, the four-way valve 5 is not energized, so that AB and CD are connected and AD is connected. When closed with BC, the refrigerant in the passage can flow in the direction of the solid arrow; in the heating mode, the four-way valve 5 is energized, so that AD and BC are connected and AB and CD are closed, so that the refrigerant in the passage can be hollowed out. flow in the direction of the arrow). In this way, when the air conditioner is operating in the cooling mode, the refrigerant storage tank 1 is located on the high pressure side of the passage (usually, when the air conditioner is operating in the cooling or heating mode, the refrigerant from the outlet of the air conditioner compressor to the part before the throttling device is the high pressure side, and the part that goes through the throttling device to the inlet of the air conditioner compressor is the low pressure side); when the air conditioner operates in the heating mode, the refrigerant storage tank 1 is located on the low pressure side of the passage.

In this way, by placing the refrigerant storage tank on the high pressure side or the low pressure side in the cooling or heating mode, the present application can help to ensure that when the air conditioner operates in the cooling or heating mode, the pressure in the storage tank is respectively higher or lower than that of the cooling Condensation pressure of the refrigerant, so as to ensure the smooth progress of the refrigerant recovery and release process.

According to a second aspect of the present invention, there is provided a refrigerant conditioning system for an air conditioner, wherein the conditioning system applies the conditioning method described above. The regulating system includes a refrigerant storage tank 1, a connecting pipe and a solenoid valve device (such as the normally closed solenoid valves A and B in FIG. 2), the solenoid valve device is arranged in the connecting pipe, and the refrigerant storage tank 1 is connected to the electromagnetic The valve device is connected to the circulation passage so as to be open and closed in a controllable manner.

Referring to Figure 2, it can be seen that when both the normally closed solenoid valves A and B are closed, the connection between the storage tank and the circulation passage is closed; when at least one of the normally closed solenoid valves A and B is turned on, the connection between the storage tank and the circulation passage is closed. The connection is turned on.

Referring to FIG. 2, the connecting pipe may have two sections connecting the two sides of the storage tank respectively, one of which is connected to the pipeline between the outdoor unit heat exchanger 3 and the throttling device 2, and the other end of the other side is located in the pipeline between the outdoor unit heat exchanger 3 and the throttle device 2. The pipeline between the four-way valve 5 and the outdoor unit heat exchanger 3 forms a parallel relationship between the refrigerant storage tank 1 and the outdoor unit heat exchanger 3 . After the refrigerant storage tank 1 is connected to the air conditioning system, the airtightness of the air conditioning system will not be affected. It should be noted that the above-mentioned parallel connection relationship is not the only implementation of the present application. For example, the storage tank can be connected to only a section of the connecting pipe, and the connecting pipe can be further branched to two ends to be connected to the two sides of the outdoor unit heat exchanger 3 respectively. side.

In this way, the simple configuration of the parallel connection between the refrigerant storage tank and the heat exchanger of the outdoor unit of the air conditioner in the present application can make use of the difference between the pressure of the outdoor heat exchanger and the connecting pipelines at both ends during the cooling and heating of the air conditioner and the pressure in the storage tank. , recovery and release of refrigerant, has the advantages of simple structure, simple control logic, stable operation and high reliability.

Preferably, the solenoid valve located upstream of the refrigerant circulation flow in the normally closed solenoid valves A and B is turned on, and the solenoid valve located downstream of the refrigerant circulation flow is closed, so that the connection between the storage tank and the circulation passage is conducted. Below in conjunction with accompanying drawing 2, divide into cooling mode and heating mode two kinds of situations are explained:

(1) When the air conditioner operates in the cooling mode, referring to the refrigerant circulation flow direction indicated by the solid arrow in FIG. 2 , the normally closed solenoid valve B is located upstream of the flow direction, and the normally closed solenoid valve A is located downstream of the flow direction (the refrigerant The flow direction is: from upstream to downstream). The present application preferably keeps the normally closed solenoid valve A closed and the normally closed solenoid valve B open. At this time, the refrigerant in the circulation passage will enter the storage tank due to the pressure difference. When the quality of the refrigerant left in the circulation passage is a predetermined value (such as the optimal refrigerant circulation quality m1 required in the cooling mode), the control will normally Close solenoid valve B is closed.

It should be noted that if valve A is opened (open A and close B or AB at the same time), the storage tank 1 can also recover the refrigerant, but it will first pass through the outdoor unit heat exchanger 3 for heat exchange (this step is not actually required), This reduces the cooling efficiency of the system.

(2) When the air conditioner operates in the heating mode, referring to the refrigerant circulation flow direction indicated by the hollow arrow in FIG. 2 , the normally closed solenoid valve A is located upstream of the flow direction, and the normally closed solenoid valve B is located downstream of the flow direction. The present application preferably keeps the normally closed solenoid valve B closed and the normally closed solenoid valve A open. At this time, the refrigerant in the storage tank will enter the circulation passage due to the pressure difference. When the quality of the refrigerant left in the circulation passage is a predetermined value (such as the optimal refrigerant circulation quality m2 required in the heating mode), control the Normally closed solenoid valve A is closed.

It should be noted that if valve B is opened (open B and close A or AB at the same time), the storage tank 1 can also release the refrigerant, but it will not exchange heat through the outdoor unit heat exchanger 3, thereby reducing the cooling efficiency of the system.

In this way, the present application can avoid the system cooling efficiency caused by the refrigerant passing through the outdoor unit heat exchanger or not passing through the outdoor unit heat exchanger before or after the refrigerant flows into or out of the storage tank in the cooling or heating mode. lowering problem.

According to a third aspect of the present invention, there is provided an air conditioner, characterized in that the air conditioner is a heat pump type air conditioner using compressed vapor refrigeration, and the air conditioner has the above refrigerant conditioning system.

In this way, when the refrigerant conditioning system of the present application is applied to the air conditioner, the quality of the refrigerant participating in the refrigeration cycle is reduced, and under the same cooling capacity and the same working conditions, the evaporating pressure of the refrigerant in the heat exchanger of the indoor unit remains unchanged, and the heat exchange of the outdoor unit The reduction of the refrigerant condensing pressure in the compressor requires corresponding adjustment of the throttling device, such as shortening the refrigeration capillary, increasing the opening of the electronic expansion valve, etc., that is, the compressor discharge pressure is reduced, and the suction pressure is unchanged, so the compression ratio is reduced. The suction pressure of the compressor remains unchanged, and the exhaust temperature decreases when the compression ratio decreases, and the compressor power and current decrease. When the exhaust temperature decreases and the current value decreases, the compressor will only enter the overload protection at a higher outdoor ambient temperature, that is, the tripping temperature will be higher, thereby improving the reliability of the air conditioner.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims (11)

1. A refrigerant conditioning method for an air conditioner in a cooling or heating mode, the air conditioner comprising a refrigerant storage tank (1), the refrigerant storage tank (1) being connected to the A refrigerant circulation path of an air conditioner; characterized in that the method comprises: Determine whether the last operating mode of the air conditioner is the cooling or heating mode; Determine whether the current operation mode of the air conditioner is the cooling or heating mode; During this operation, if the current operation mode is consistent with the last operation mode, the connection between the storage tank and the circulation passage is closed; if the current operation mode is the same as the last operation mode If they are inconsistent, the connection between the storage tank and the circulation passage is conducted, so that the storage tank can participate in the recovery or release of the refrigerant in the circulation passage. 2 . The refrigerant conditioning method according to claim 1 , wherein the judging that the last operation mode of the air conditioner is a cooling or heating mode comprises: 2 . When the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured to be the configured amount of the air conditioner operating in the cooling or heating mode; And when the air conditioner operates for the first time, the last operation mode is determined to be the cooling or heating mode corresponding to the refrigerant configuration amount at the factory. 3 . The refrigerant adjustment method according to claim 2 , wherein, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured so that the air conditioner operates in cooling or heating. 4 . The amount of configuration in the mode, including: When the configuration is the configuration amount of the air conditioner operating in the cooling mode, the configuration amount of the refrigerant in the circulation passage is m1; When the configuration is the configuration amount that the air conditioner operates in the heating mode, the configuration amount of the refrigerant in the circulation passage is m2; Wherein, m1 is the optimal refrigerant circulation quality required when the air conditioner operates in the cooling mode, and m2 is the optimal refrigerant circulation quality required when the air conditioner operates in the heating mode. 4 . The refrigerant adjustment method according to claim 3 , wherein, when the air conditioner leaves the factory, the amount of refrigerant in the storage tank and the circulation passage is configured as the configuration amount when the air conditioner operates in a cooling mode. 5 . , and the configuration amount of refrigerant in the circulation passage is m1, and the configuration amount of refrigerant in the storage tank is m3=m2-m1+mx, where mx takes a value greater than zero and makes the air conditioner operate in cooling or heating mode , the pressure in the storage tank is respectively higher or lower than the condensation pressure of the refrigerant. 5 . The method for regulating refrigerant according to claim 1 , wherein the connection between the storage tank and the circulation passage is conducted, so that the storage tank can participate in the Recovery or release of refrigerant in the circulation path, including: When the air conditioner operates in the cooling mode, the inflow of the refrigerant recovery from the circulation passage to the storage tank is monitored, so that when the quality of the refrigerant remaining in the circulation passage is the optimum refrigerant required in the cooling mode When the circulation quality is high, the connection between the storage tank and the circulation passage is closed; When the air conditioner operates in the heating mode, the outflow amount of the refrigerant released from the storage tank to the circulation passage is monitored, so that when the quality of the refrigerant remaining in the circulation passage is the optimum required in the heating mode When the refrigerant circulation quality is high, the connection between the storage tank and the circulation passage is closed. 6. The refrigerant adjustment method according to any one of claims 1-5, wherein the method further comprises: When the air conditioner operates in a cooling mode, the refrigerant storage tank (1) is positioned on the high pressure side of the circulation passage; When the air conditioner operates in a heating mode, the refrigerant storage tank (1) is placed on the low pressure side of the circulation passage. 7. A refrigerant conditioning system for air conditioning, wherein the conditioning system applies the conditioning method according to any one of claims 1-6, wherein the conditioning system comprises the refrigerant storage tank (1) , a connecting pipe and a solenoid valve device, the solenoid valve device is arranged in the connecting pipe, and the refrigerant storage tank (1) is connected to the solenoid valve device through the connecting pipe and the solenoid valve device in a controlled open-close manner the circulation path. 8 . The refrigerant conditioning system according to claim 7 , wherein the air conditioner comprises an outdoor unit heat exchanger ( 3 ), and the storage tank is respectively connected to the outdoor unit heat exchanger ( 3 ) through the connecting pipe. 9 . 3) The two sides are connected; the solenoid valve device includes normally closed solenoid valves A and B, which are respectively arranged in the connecting pipes connected on the two sides; In addition, when both the normally closed solenoid valves A and B are closed, the connection between the storage tank and the circulation passage is closed; when at least one of the normally closed solenoid valves A and B is turned on, the storage tank is closed. The connection between the tank and the circulation passage is conducted. 9 . The refrigerant regulating system according to claim 8 , wherein the solenoid valves located upstream of the refrigerant circulation flow in the normally closed solenoid valves A and B are turned on, and the solenoid valves located downstream of the refrigerant circulation flow are made to conduct. 10 . The solenoid valve is closed, so that the connection between the storage tank and the circulation passage is conducted. 10. The refrigerant regulating system according to any one of claims 7-9, wherein the regulating system applies the regulating method according to claim 5, and the regulating system further comprises: The refrigerant entering and leaving the storage tank must pass through the flow meter in the flow path, so that: When the air conditioner operates in the cooling mode, the flowmeter monitors the refrigerant recovery inflow Δm=m2-m1 of the storage tank from the circulation passage, and closes the connection between the storage tank and the circulation passage ; When the air conditioner operates in the heating mode, when monitoring the outflow of refrigerant from the storage tank to the circulation passage Δm'=m2-m1, the connection between the storage tank and the circulation passage is closed; Wherein, m1 is the optimal refrigerant circulation quality required when the air conditioner operates in the cooling mode, and m2 is the optimal refrigerant circulation quality required when the air conditioner operates in the heating mode. 11. An air conditioner, characterized in that the air conditioner is a heat pump type air conditioner using compressed vapor refrigeration, and the air conditioner has the refrigerant conditioning system according to any one of claims 7-10.

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