CN113639485B - Method and device for adjusting exhaust superheat degree of heat pump equipment and heat pump equipment - Google Patents

Abstract

The application relates to the technical field of heat pump equipment and discloses a method for adjusting the exhaust superheat degree of the heat pump equipment. The method for adjusting the degree of superheat of the exhaust gas of the heat pump device comprises the following steps: obtaining the exhaust superheat degree of a compressor of the heat pump equipment and the operation mode of the heat pump equipment, wherein the operation mode comprises a heating mode and a refrigerating mode; determining the refrigerant storage speed or the refrigerant release speed of the liquid storage device according to the operation mode and the exhaust superheat degree, wherein the refrigerant storage speed corresponds to the heating mode, and the refrigerant release speed corresponds to the refrigerating mode; and adjusting a flow control valve for controlling the liquid storage device to an opening corresponding to the refrigerant storage speed or the refrigerant release speed. The method for adjusting the exhaust superheat degree of the heat pump equipment can give consideration to the refrigerant quantity and the exhaust superheat degree in the circulating system, and improves the working efficiency of the heat pump equipment. The application also discloses a device for adjusting the exhaust superheat degree of the heat pump equipment and the heat pump equipment.

Description

Method, device and heat pump device for regulating the degree of superheat of heat pump device exhaust gas

technical field

The present application relates to the technical field of heat pump equipment, for example, to a method and device for adjusting the superheat degree of exhaust gas from the heat pump equipment, and the heat pump equipment.

Background technique

At present, because the capacity of the water heater system is generally small, the sensitivity of the water heater system to the amount of refrigerant is high. The small difference in the amount of refrigerant in the system operation has a great impact on the overall performance of the system. The optimal amount of refrigerant is different. The existing hot water machine system adds a liquid storage tank to solve the problem of different refrigerant volumes for heating and cooling. The liquid storage tank generally uses the difference in density of the gas-liquid two-phase state of the refrigerant to separate the gas and liquid. Part of the liquid refrigerant is stored in the liquid tank to realize the adjustment of the amount of refrigerant in the water heater system.

The exhaust superheat of the compressor refers to the temperature difference between the compressor exhaust pipe and the saturation temperature corresponding to the current condensing pressure in the condenser. Too high or too low exhaust superheat will have an adverse effect on the water heater. In some In the prior art, if the exhaust superheat is too low, the refrigerant will be injected into the circulation system of the hot water machine from the liquid storage tank, and if the exhaust superheat is too high, the injection of refrigerant into the circulation system of the water heater will be stopped. Actively adjust the amount of refrigerant participating in the cycle, so as to maintain the exhaust superheat within a certain range.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in related technologies:

The water heater in the heating mode needs less refrigerant, and the water heater in the cooling mode needs more refrigerant. When the water heater switches from the heating mode to the cooling mode, or from the cooling mode to the heating During the switching process of the mode, the aforementioned prior art cannot take into account both the amount of refrigerant and the degree of superheat of the exhaust gas.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a method, device and heat pump device for adjusting the exhaust superheat of heat pump equipment, so as to solve the technical problem that the amount of refrigerant and the exhaust superheat cannot be considered in the prior art during operation mode switching.

In some embodiments, the heat pump equipment includes a liquid storage device, and the method for adjusting the exhaust superheat degree of the heat pump equipment includes: obtaining the exhaust superheat degree of the compressor of the heat pump equipment, and the operation mode of the heat pump equipment, The operation mode includes a heating mode and a cooling mode; according to the operation mode and the exhaust superheat, the refrigerant storage speed or the refrigerant release speed of the liquid storage device is determined, and the refrigerant storage speed is related to the heating The mode corresponds, and the release rate of the refrigerant corresponds to the cooling mode; the flow control valve used to control the liquid storage device is adjusted to an opening corresponding to the storage rate of the refrigerant or the release rate of the refrigerant.

Optionally, according to the operation mode and the degree of superheat of the exhaust gas, determining the refrigerant storage rate or refrigerant release rate of the liquid storage device includes: obtaining the current refrigerant amount of the liquid storage device; obtaining a set refrigerant amount A refrigerant amount difference from the current refrigerant amount; according to the refrigerant amount difference and the degree of superheat of the exhaust gas, determine the refrigerant storage rate or the refrigerant release rate of the liquid storage device.

Optionally, determining the refrigerant storage rate or the refrigerant release rate of the liquid storage device according to the refrigerant amount difference and the exhaust superheat degree includes: obtaining the exhaust gas superheat corresponding to the The refrigerant storage speed or the refrigerant release speed; according to the refrigerant storage speed or the refrigerant release speed, obtain the estimated duration for the refrigerant amount difference to be zero; when the estimated duration is less than the set duration In the case of , according to the refrigerant amount difference and the preset duration, re-determine the refrigerant storage rate or the refrigerant release rate, so that the new estimated duration for the refrigerant amount difference to become zero is greater than or equal to The set duration.

Optionally, obtaining the refrigerant storage rate or the refrigerant release rate corresponding to the exhaust superheat includes: in the heating mode, if the exhaust superheat is greater than a first set temperature , then determine that the refrigerant storage rate is the first storage rate; if the exhaust gas superheat is less than or equal to the second set temperature, then determine that the refrigerant storage rate is the second storage rate, wherein the first storage The speed is greater than the second storage speed; in the refrigeration mode, if the exhaust superheat is greater than the second set temperature, the refrigerant release rate is determined to be the first release rate; if the exhaust superheat If it is less than or equal to the second set temperature, then the refrigerant release rate is determined to be the second release rate, wherein the first release rate is smaller than the second release rate.

Optionally, obtaining the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount includes: in the heating mode, determining the difference between the first set refrigerant amount and the current refrigerant amount as the refrigerant amount amount difference; in cooling mode, the difference between the current refrigerant amount and the second set refrigerant amount is determined as the refrigerant amount difference; wherein, the first set refrigerant amount is greater than the second set refrigerant amount Set the amount of refrigerant.

Optionally, the method for adjusting the degree of superheat of the exhaust gas of the heat pump equipment further includes: when the refrigerant amount difference is less than or equal to the set refrigerant amount difference, increasing the refrigerant storage rate or the refrigerant release rate Determined to be zero.

Optionally, the method for adjusting the degree of superheat of the heat pump device further includes: reducing the frequency of the compressor and/or increasing the frequency of the fan of the heat pump device when the degree of superheat of the exhaust gas is greater than a set temperature Rotational speed; when the degree of superheat of the exhaust gas is less than or a set temperature, increase the frequency of the compressor, and/or decrease the rotational speed of the fan of the heat pump device.

In some embodiments, the apparatus for adjusting the exhaust superheat of the heat pump device includes: an obtaining module, a first determination module and a first control module, wherein the obtaining module is configured to obtain the exhaust gas of the compressor of the heat pump device degree of superheat, and the operation mode of the heat pump device, the operation mode includes a heating mode and a cooling mode; the first determining module is configured to determine the storage capacity according to the operation mode and the degree of superheat of the exhaust The refrigerant storage speed or refrigerant release speed of the liquid device, the refrigerant storage speed corresponds to the heating mode, and the refrigerant release speed corresponds to the cooling mode; the first control module is configured to use The flow control valve controlling the liquid storage device is adjusted to an opening corresponding to the refrigerant storage speed or refrigerant release speed.

In some embodiments, the device for adjusting the exhaust superheat of heat pump equipment includes a processor and a memory storing program instructions, and the processor is configured to perform the functions provided by the foregoing embodiments when executing the program instructions A method for adjusting the exhaust superheat of heat pump equipment.

In some embodiments, the heat pump equipment includes the device for adjusting the superheat degree of exhaust gas from the heat pump equipment provided in the foregoing embodiments.

The method, device, and heat pump equipment for adjusting the exhaust superheat of heat pump equipment provided by the embodiments of the present disclosure can achieve the following technical effects:

In the heating mode, the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system. At this time, the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed; In the cooling mode, the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system. At this time, the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant. On the one hand, the circulation of the heat pump equipment can be improved. The amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by corresponding drawings, and these exemplifications and drawings do not constitute limitations to the embodiments, and elements with the same reference numerals in the drawings are regarded as similar elements, and where:

FIG. 1 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure;

Fig. 2 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure;

Fig. 3 is a schematic diagram of a method for adjusting the exhaust superheat of a heat pump device provided by an embodiment of the present disclosure;

Fig. 4 is a schematic diagram of a device for adjusting the exhaust superheat of a heat pump device provided by an embodiment of the present disclosure;

Fig. 5 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first", "second" and the like in the description and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances so as to facilitate the embodiments of the disclosed embodiments described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiments of the present disclosure, the character "/" indicates that the preceding and following objects are an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and/or B means: A or B, or, A and B, these three relationships.

The heat pump device in the embodiments of the present disclosure refers to a device composed of a compressor, a condenser, an evaporator, etc., and may be a water heater or an air conditioner.

Fig. 1 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure. As shown in FIG. 1 , the circulation system of the heat pump equipment includes a compressor 11 , an internal heat exchanger 12 , an external heat exchanger 13 , a throttle valve 14 , a liquid storage device 15 , and valves A, B and C. Wherein, the compressor 11 is connected with the heat exchanger 12 of the internal machine, the compressor 11 is connected with the heat exchanger 13 of the external machine, the heat exchanger 13 of the external machine is connected with the throttle valve 14, and the throttle valve 14 is exchanged with the internal machine through the valve C. Heater 12 is connected, the pipeline between throttle valve 14 and valve C is connected to one end of valve A, the other end of valve A extends to the inside of liquid storage device 15 through pipeline a, and the internal heat exchanger 12 and valve C The pipeline in between is connected to one end of valve B, and the other end of valve B extends to the inside of the liquid storage device 15 through the pipeline b, and the port of the pipeline a inside the liquid storage device 15 is connected to that of the pipeline b in the liquid storage device 15 above the internal ports. Valve A, valve B, and valve C form flow control valves for adjusting the amount of refrigerant inside the liquid storage device 15. When the heat pump equipment is in the heating mode, valve A and valve B are opened, and the refrigerant is stored by the circulation system of the heat pump equipment. To the liquid storage device 15, at this time the valve C can be closed or have a certain opening; when the heat pump equipment is in cooling mode, valve A and valve B are opened, and the refrigerant is released from the liquid storage device 15 to the circulation system of the heat pump equipment , at this time the valve C can be closed or have a certain opening.

When the heat pump device is in the heating mode, adjust the amount of refrigerant inside the liquid storage device 15 to the first set refrigerant amount L1, then close valve A and valve B, and open valve C to the maximum opening; when the heat pump device is in In cooling mode, adjust the amount of refrigerant inside the liquid storage device 15 to the second set refrigerant amount L2, then close valve A and valve B, and open valve C to the maximum opening.

Fig. 2 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure. As shown in FIG. 2 , the circulation system of the heat pump equipment includes a compressor 11 , an internal heat exchanger 12 , an external heat exchanger 13 , a throttle valve 14 , a liquid storage device 15 , and valves D and E. Wherein, the compressor 11 is connected with the internal heat exchanger 12, the compressor 11 is connected with the external heat exchanger 13, the external heat exchanger 13 is connected with the throttle valve 14, and the throttle valve 14 is connected with the internal heat exchanger 12. connection, the pipeline between the compressor 11 and the external unit heat exchanger 13 is connected to one end of the valve E, and the other end of the valve E extends to the inside of the liquid storage device 15 through the pipeline e, and the internal unit heat exchanger 12 is connected to the throttling The pipeline between the valves 14 is connected to one end of the valve D, and the other end of the valve D extends to the inside of the liquid storage device 15 through the pipeline d, wherein the port of the pipeline e in the liquid storage device 15 is in the position of the pipeline d in the storage device. above the port in the liquid device 15. Valve E and valve D constitute flow control valves for adjusting the amount of refrigerant inside the liquid storage device 15. When the heat pump equipment is in the heating mode, valve D and valve E are opened, and the refrigerant is stored in the liquid storage by the circulation system of the heat pump equipment. Device 15; when the heat pump equipment is in cooling mode, the valve D and the valve E are opened, and the refrigerant is released from the liquid storage device 15 to the circulation system of the heat pump equipment.

When the heat pump device is in the heating mode, adjust the amount of refrigerant inside the liquid storage device 15 to the first set refrigerant amount L1, and then close the valve D and valve E; The refrigerant amount inside the liquid device 15 is adjusted to the second set refrigerant amount L2, and then the valve D and the valve E are closed.

Fig. 3 is a schematic diagram of a method for adjusting the exhaust superheat degree of a heat pump device provided by an embodiment of the present disclosure. The method for adjusting the superheat degree of exhaust gas from a heat pump device can be executed by a controller of the heat pump device.

As shown in Figure 3, the methods for adjusting the exhaust superheat of the equipment include:

S301. Obtain the exhaust superheat degree of the compressor of the heat pump device, and the operation mode of the heat pump device, where the operation mode includes a heating mode and a cooling mode.

When the heat pump equipment is in the heating mode, the refrigerant of the heat pump system condenses and releases heat in the internal heat exchanger; when the heat pump equipment is in the cooling mode, the refrigerant of the heat pump system evaporates and absorbs heat in the internal heat exchanger.

The exhaust superheat of the compressor of the heat pump equipment refers to the temperature difference between the exhaust temperature of the compressor and the saturation temperature corresponding to the condensation pressure in the condenser. Obtain the exhaust temperature of the compressor and the condensation pressure in the condenser, then obtain the saturation temperature corresponding to the condensation pressure, and calculate the difference between the exhaust temperature and the saturation temperature to obtain the exhaust superheat.

S302. Determine a refrigerant storage rate or a refrigerant release rate of the liquid storage device according to the operation mode and the degree of superheat of the exhaust gas. The refrigerant storage rate corresponds to the heating mode, and the refrigerant release rate corresponds to the cooling mode.

The amount of refrigerant required by heat pump equipment for heating is usually lower than the amount of refrigerant required for cooling. The above-mentioned refrigerant storage speed corresponds to the heating mode, which means that the heat pump equipment determines the refrigerant storage speed in the heating mode. When the heat pump equipment is switched from the cooling mode to the heating mode, the circulation system of the heat pump equipment needs to store the refrigerant in the liquid storage device to reduce the amount of refrigerant in the circulation system of the heat pump equipment, and the aforementioned refrigerant storage speed is the cycle The speed at which the system stores refrigerant in the liquid storage device;

In some application scenarios, the heat pump device was running in the cooling mode last time, and it is running in the heating mode when it is turned on this time, that is, the heat pump device is switched from the cooling mode to the heating mode; or, the heat pump device running in the heating mode enters the cooling mode. In frost mode, after the end of defrost mode, the heat pump equipment switches from cooling mode to heating mode.

The above refrigerant release speed corresponds to the cooling mode, which means that the heat pump equipment determines the refrigerant release speed in the cooling mode. When the heat pump equipment is switched from the heating mode to the cooling mode, it needs to be circulated from the liquid storage device to the heat pump equipment. The system releases the refrigerant to increase the amount of refrigerant in the circulation system of the heat pump equipment, and the aforementioned release speed of the refrigerant is the speed at which the liquid storage device releases the refrigerant to the circulation system.

In some application scenarios, the heat pump device was running in the heating mode last time, and it is running in the cooling mode when it is turned on this time, that is, the heat pump device switches from the heating mode to the cooling mode; or, the heat pump device running in the heating mode enters the Frost mode means that the heat pump equipment switches from heating mode to cooling mode.

After the heat pump equipment is switched from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode. At this time, the circulation system stores the refrigerant in the liquid storage device, and the storage speed of the refrigerant can be increased, which can quickly reduce the pressure of the refrigerant in the system, which is beneficial to reduce Exhaust superheat; reducing the refrigerant storage speed can slowly reduce the refrigerant pressure in the system, which has the opposite effect on reducing the exhaust superheat and is conducive to maintaining or increasing the exhaust superheat. For example, increasing the frequency of the compressor at the same time can achieve Maintain or increase exhaust superheat.

After the heat pump equipment is switched from the heating mode to the cooling mode, the heat pump equipment is running in the cooling mode. At this time, the liquid storage device releases the refrigerant to the circulation system, increasing the release speed of the refrigerant, which can quickly increase the pressure of the refrigerant in the system, which is conducive to improving the discharge rate. Gas superheat; reducing the refrigerant release speed can slowly increase the refrigerant pressure in the system, which has the opposite effect on increasing the exhaust superheat, which is conducive to maintaining or reducing the exhaust superheat. For example, reducing the frequency of the compressor at the same time can achieve maintenance. Or reduce the exhaust superheat.

If the exhaust superheat is too low, adjust the refrigerant storage speed or refrigerant release speed in the direction that is conducive to increasing the refrigerant pressure in the heat pump equipment circulation system, such as reducing the refrigerant storage speed or increasing the refrigerant release speed; if the exhaust gas superheat is too high High, adjust the refrigerant storage speed or refrigerant release speed in the direction that is beneficial to reduce the refrigerant pressure in the circulation system of the heat pump equipment, such as increasing the refrigerant storage speed or reducing the refrigerant release speed, so as to maintain the exhaust superheat within a certain range . When the degree of superheat of the exhaust gas is within a certain range, it is beneficial to improve the cooling efficiency or heating efficiency of the heat pump equipment, and can reduce the phenomenon of liquid shock.

Optionally, according to the operating mode and the degree of superheat of the exhaust gas, determining the refrigerant storage rate or refrigerant release rate of the liquid storage device includes: obtaining the current refrigerant amount of the liquid storage device; obtaining the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount value; according to the refrigerant amount difference and the degree of superheat of the exhaust gas, determine the refrigerant storage speed or refrigerant release speed of the liquid storage device.

The amount of refrigerant required by heat pump equipment in heating mode is less than the amount of refrigerant required by heat pump equipment in cooling mode. For heat pump equipment with fixed models and fixed working conditions, the optimal amount of refrigerant required in heating mode and in The optimal amount of refrigerant required in the cooling mode is a known value, for example, the optimal amount of refrigerant required by the heat pump device in the heating mode and the optimal amount of refrigerant required by the heat pump device in the cooling mode are obtained through experiments. Wherein, the optimal amount of refrigerant refers to the amount of refrigerant that enables the heat pump equipment to have the highest cooling efficiency or heating efficiency.

After the heat pump equipment switches from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode. At this time, it is necessary to adjust the amount of refrigerant in the circulation system of the heat pump equipment to the optimal amount of refrigerant required by the heat pump equipment in the heating mode. That is, it is necessary to adjust the amount of refrigerant stored in the liquid storage device to a specific value, for example, adjust the amount of refrigerant in the liquid storage device to a first set refrigerant amount.

After the heat pump equipment switches from the heating mode to the cooling mode, the heat pump equipment operates in the cooling mode. At this time, the amount of refrigerant in the circulation system of the heat pump equipment needs to be adjusted to the optimal amount of refrigerant required by the heat pump equipment in the cooling mode, that is, It is necessary to adjust the amount of refrigerant stored in the liquid storage device to a specific value, for example, adjust the amount of refrigerant in the liquid storage device to a second set refrigerant amount, wherein the first set refrigerant amount is greater than the second set refrigerant amount.

By adopting the above technical solution, the refrigerant storage speed or refrigerant release speed of the liquid storage device is adjusted according to the refrigerant amount difference, and the current refrigerant amount of the liquid storage device can be adjusted to the set refrigerant amount, that is, the circulation system of the heat pump equipment The amount of refrigerant is adjusted to the optimal amount of refrigerant.

After the heat pump equipment is switched from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode, the amount of refrigerant in the circulation system of the heat pump equipment is greater than the optimal amount of refrigerant required by the heat pump equipment in the heating mode, and the liquid storage device The current amount of refrigerant is less than the first set refrigerant amount; after the heat pump equipment is switched from the heating mode to the cooling mode, the heat pump equipment is running in the cooling mode, and the refrigerant volume in the circulation system of the heat pump equipment is less than the maximum required by the heat pump equipment in the cooling mode. Optimal amount of refrigerant, the current amount of refrigerant in the liquid storage device is greater than the second set amount of refrigerant. The refrigerant amount difference between the set refrigerant amount and the current refrigerant amount can be obtained in the following ways: in the heating mode, the difference between the first set refrigerant amount and the current refrigerant amount is determined as the refrigerant amount difference; in the cooling mode , determining the difference between the current refrigerant amount and the second set refrigerant amount as the refrigerant amount difference.

In some application scenarios, the smaller the refrigerant amount difference is, the smaller the refrigerant storage rate or the refrigerant release rate of the liquid storage device is. When the circulation system of the heat pump equipment is in the heating cycle, the liquid storage device is in the state of storing refrigerant, that is, the amount of refrigerant in the liquid storage device only increases and does not decrease; when the circulation system of the heat pump equipment is in the cooling mode, the liquid storage device is in the state of The state of releasing the refrigerant, that is, the amount of refrigerant in the liquid storage device only decreases but does not increase. The smaller the difference in the amount of refrigerant, the smaller the refrigerant storage speed or refrigerant release speed of the liquid storage device, the current refrigerant in the liquid storage device can be reduced. The amount of refrigerant can be adjusted to the set refrigerant amount more accurately, reducing the occurrence of excessive storage or excessive release.

Alternatively, determining the refrigerant storage speed or refrigerant release speed of the liquid storage device according to the refrigerant amount difference and the degree of superheat of the exhaust gas may include: obtaining the refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas; or the refrigerant release speed, to obtain the estimated time for making the refrigerant amount difference to zero; if the estimated time is less than the set time, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset time , so that the new estimated time period for the refrigerant amount difference to be zero is greater than or equal to the set time period.

For example, when the unit of refrigerant storage speed or refrigerant release speed is mL/s, and the unit of refrigerant amount difference is cm, the product of the refrigerant amount difference and the cross-sectional area of the liquid storage device can be calculated first, and then the The estimated duration can be obtained by multiplying the product by the refrigerant storage speed or refrigerant release speed.

When the heat pump device is in the heating mode, obtain the first refrigerant amount difference between the first set refrigerant amount and the current refrigerant amount, and determine that the current refrigerant amount reaches the first set refrigerant amount according to the first refrigerant amount difference and the refrigerant storage speed The first estimated duration of the amount. If the first estimated duration is less than the first set duration, the refrigerant storage speed is re-determined according to the first refrigerant amount difference and the first set duration.

When the heat pump device is in cooling mode, obtain the second refrigerant amount difference between the current refrigerant amount and the second set refrigerant amount, and determine that the current refrigerant amount reaches the second set refrigerant amount according to the second refrigerant amount difference and the refrigerant release speed The second estimated duration; if the second estimated duration is less than the second set duration, the refrigerant release rate is re-determined according to the second refrigerant amount difference and the second set duration.

The estimated duration includes the first preset duration and the second estimated duration, and the set duration includes the first preset duration and the second preset duration. Here, the size relationship between the first preset duration and the second preset duration is not discussed. Specific limits.

In the above technical solution, if the estimated duration is less than the set duration, it means that the current amount of refrigerant in the liquid storage device is about to reach the set amount of refrigerant. The new estimated time period that becomes zero is greater than or equal to the set time period, so as to reduce the phenomenon that the liquid storage device stores too much refrigerant or releases refrigerant.

Further, after obtaining the estimated time period for making the refrigerant amount difference to zero according to the refrigerant storage speed or refrigerant release speed, if the estimated time length is greater than or equal to the set time length, then according to the refrigerant release speed or refrigerant storage speed The flow control valve of the liquid storage device is controlled.

By setting a set duration, when the difference between the current refrigerant amount in the liquid storage device and the set refrigerant amount is large, the refrigerant storage speed or refrigerant release speed will not be reduced, so as to reduce the adjustment of the current refrigerant amount to The length of time required to set the amount of refrigerant, that is, the length of time to reduce the amount of refrigerant in the circulation system of the heat pump equipment to reach the optimal amount of refrigerant; the difference between the current amount of refrigerant in the liquid storage device and the amount of refrigerant set is small When the refrigerant is stored or released, the refrigerant storage speed or refrigerant release speed is reduced to reduce the phenomenon that the liquid storage device stores too much refrigerant or releases refrigerant, and accurately adjusts the current refrigerant amount in the liquid storage device to the set refrigerant amount. That is, the amount of refrigerant in the circulation system of the heat pump device is accurately adjusted to the optimal amount of refrigerant.

That is, a balance is struck between quickly adjusting the amount of refrigerant in the circulation system of the heat pump device to the optimal amount of refrigerant and accurately adjusting the amount of refrigerant in the cycle system of the heat pump device to the optimal amount of refrigerant.

In practical applications, the current amount of refrigerant is usually obtained by detecting the liquid level in the liquid storage device. When the liquid level of the liquid storage device changes quickly, that is, the cross-sectional area of the liquid storage device is small, you can set a A larger setting time; when the liquid level of the liquid storage device changes slowly, that is, the cross-sectional area of the liquid storage device is larger, a smaller setting time can be set.

The embodiment of the present disclosure does not limit the specific numerical value of the set duration, and those skilled in the art can determine an appropriate set duration according to the actual cross-sectional area of the liquid storage device.

The refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas can be obtained in the following manner: in the heating mode, if the degree of superheat of the exhaust gas is greater than the first set temperature, determine the refrigerant storage speed as the first storage speed; If the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the storage rate of the refrigerant as the second storage rate, wherein the first storage rate is greater than the second storage rate; in cooling mode, if the degree of superheat of the exhaust gas is greater than the second If the temperature is set, the refrigerant release rate is determined to be the first release rate; if the exhaust gas superheat is less than or equal to the second set temperature, the refrigerant release rate is determined to be the second release rate, wherein the first release rate is less than the second release rate speed.

If the refrigerant amount difference is greater than the set refrigerant amount difference, perform the preceding steps: obtain the refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas; obtain the refrigerant amount according to the refrigerant storage speed or refrigerant release speed The estimated time when the difference becomes zero; if the estimated time is less than the set time, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset time, so that the refrigerant amount difference becomes zero The new estimated duration for is greater than or equal to the set duration.

In the case that the refrigerant amount difference is less than or equal to the set refrigerant amount difference, the refrigerant storage rate or the refrigerant release rate is determined to be zero.

Setting the refrigerant amount difference is an exit condition for adjusting the refrigerant amount in the circulation system of the heat pump equipment. The determined refrigerant storage speed or refrigerant release speed is also getting smaller and smaller, but the accuracy of the flow control valve of the liquid storage device is limited. When the refrigerant amount difference is less than or equal to the set refrigerant amount difference, Exit the adjustment process of the amount of refrigerant in the circulation system of the heat pump device to reduce the occurrence of a smaller meaningless refrigerant storage speed or refrigerant release speed (for example, a refrigerant storage speed or refrigerant release speed that is less than the minimum accuracy of the flow control valve, That is, the phenomenon of meaningless refrigerant storage speed or refrigerant release speed).

S303. Adjust the flow control valve used to control the liquid storage device to an opening corresponding to the refrigerant storage speed or the refrigerant release speed.

For example, the corresponding relationship between the inlet pressure, outlet pressure, refrigerant storage speed or refrigerant release speed, and the opening of the flow control valve of the liquid storage device can be stored in the database. After obtaining the inlet pressure and outlet pressure of the liquid storage device , the refrigerant storage speed or the refrigerant release speed, the opening of the flow control valve corresponding to the refrigerant storage speed or the refrigerant release speed can be obtained.

Alternatively, the correspondence between the operating frequency of the compressor, the refrigerant storage speed or refrigerant release speed, and the opening of the flow control valve can be stored in the database. After obtaining the compressor operating frequency, refrigerant storage speed or refrigerant release speed, That is, the opening degree of the flow control valve corresponding to the refrigerant storage speed or the refrigerant release speed can be obtained through the database.

In the heating mode, the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system. At this time, the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed; In the cooling mode, the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system. At this time, the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant. On the one hand, the circulation of the heat pump equipment can be improved. The amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.

In order to adjust the exhaust superheat to the set temperature more quickly, the method for adjusting the exhaust superheat of the heat pump equipment may further include: reducing the frequency of the compressor when the exhaust superheat is greater than the set temperature, and /or, increase the fan speed of the heat pump equipment; increase the frequency of the compressor, and/or decrease the fan speed of the heat pump equipment when the degree of superheat of the exhaust gas is less than or a set temperature.

Fig. 4 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure. The device for adjusting the exhaust superheat of the heat pump equipment is implemented in the form of software, hardware or a combination of the two. Referring to FIG. 4, the device for adjusting the exhaust superheat of the heat pump equipment includes: an obtaining module 41, a first determination module 42 and the first control module 43, wherein the obtaining module 41 is configured to obtain the exhaust superheat degree of the compressor of the heat pump equipment, and the operation mode of the heat pump equipment, the operation mode includes heating mode and cooling mode; the first determining module 42 is configured to determine the refrigerant storage speed or refrigerant release speed of the liquid storage device according to the operation mode and the degree of superheat of the exhaust gas, the refrigerant storage speed corresponds to the heating mode, and the refrigerant release speed corresponds to the cooling mode; the first control module 43 It is configured to adjust the flow control valve for controlling the liquid storage device to an opening degree corresponding to the refrigerant storage speed or the refrigerant release speed.

In the heating mode, the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system. At this time, the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed; In the cooling mode, the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system. At this time, the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant. On the one hand, the circulation of the heat pump equipment can be improved. The amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.

Optionally, the first determining module includes a first obtaining unit, a second obtaining unit, and a determining unit, wherein the first obtaining unit is configured to obtain the current amount of refrigerant of the liquid storage device;

The second obtaining unit is configured to obtain the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount;

The determining unit is configured to determine a refrigerant storage rate or a refrigerant release rate of the liquid storage device according to the refrigerant amount difference and the degree of superheat of the exhaust gas.

Optionally, the determination unit is specifically configured to: obtain a refrigerant storage rate or a refrigerant release rate corresponding to the degree of superheat of the exhaust gas; and obtain an estimated time period for making the refrigerant amount difference to zero according to the refrigerant storage rate or refrigerant release rate ; When the estimated duration is less than the set duration, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset duration, so that the new estimated duration when the refrigerant amount difference becomes zero is greater than or equal to the set duration. Timing length.

Optionally, obtaining the refrigerant storage rate or refrigerant release rate corresponding to the degree of superheat of the exhaust gas includes: in the heating mode, if the degree of superheat of the exhaust gas is greater than the first set temperature, determining that the refrigerant storage rate is the first storage rate speed; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the refrigerant storage speed as the second storage speed, wherein the first storage speed is greater than the second storage speed; in cooling mode, if the degree of superheat of the exhaust gas is greater than For the second set temperature, determine the refrigerant release rate as the first release rate; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the refrigerant release rate as the second release rate, wherein the first release rate is less than the first release rate 2. Release speed.

Optionally, the first obtaining unit is specifically configured to: in the heating mode, determine the difference between the first set refrigerant amount and the current refrigerant amount as the refrigerant amount difference; in the cooling mode, determine the difference between the current refrigerant amount and The difference of the second set refrigerant amount is determined as the refrigerant amount difference; wherein, the first set refrigerant amount is greater than the second set refrigerant amount.

Optionally, the device for adjusting the degree of superheating of the exhaust gas of the heat pump equipment further includes a second determination module configured to store the refrigerant The velocity or refrigerant release velocity is determined to be zero.

Optionally, the device for adjusting the exhaust superheat of the heat pump equipment further includes a second control module and a third control module, and the second control module is configured to reduce the frequency, and/or, increase the fan speed of the heat pump equipment; the third control module is configured to increase the frequency of the compressor, and/or, reduce the fan speed of the heat pump equipment when the degree of superheat of the exhaust gas is less than or the set temperature Rotating speed.

In some embodiments, the device for adjusting the exhaust superheat of the heat pump equipment includes a processor and a memory storing program instructions, and the processor is configured to execute the method for adjusting the heat pump equipment provided in the foregoing embodiments when executing the program instructions. Method of exhaust superheat.

Fig. 5 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure. As shown in Figure 5, the device for adjusting the exhaust superheat of the heat pump equipment includes:

A processor (processor) 51 and a memory (memory) 52 may also include a communication interface (Communication Interface) 53 and a bus 54 . Wherein, the processor 51 , the communication interface 53 , and the memory 52 can communicate with each other through the bus 54 . The communication interface 53 can be used for information transmission. The processor 51 can call the logic instructions in the memory 52 to execute the method for adjusting the superheat degree of the exhaust gas of the heat pump device provided in the foregoing embodiments.

In addition, the logic instructions in the above-mentioned memory 52 may be implemented in the form of software function units and when sold or used as an independent product, they may be stored in a computer-readable storage medium.

As a computer-readable storage medium, the memory 52 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 51 executes functional applications and data processing by running software programs, instructions and modules stored in the memory 52, that is, implements the methods in the foregoing method embodiments.

The memory 52 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 52 may include a high-speed random access memory, and may also include a non-volatile memory.

An embodiment of the present disclosure provides a heat pump device, including the device for adjusting the superheat degree of exhaust gas from the heat pump device provided in the foregoing embodiments.

The heat pump device can be an air conditioner or a water heater.

An embodiment of the present disclosure provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are configured to execute the method for adjusting the superheat degree of exhaust gas from a heat pump device provided in the foregoing embodiments.

An embodiment of the present disclosure provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is made to execute the information provided in the foregoing embodiments. A method for regulating the degree of superheat of the exhaust gas of a heat pump plant.

The above-mentioned computer-readable storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present disclosure can be embodied in the form of software products, which are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc. A medium that can store program code, or a transitory storage medium.

The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, procedural, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Also, the terms used in the present application are used to describe the embodiments only and are not used to limit the claims. As used in the examples and description of the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well unless the context clearly indicates otherwise . Additionally, when used in this application, the term "comprise" and its variants "comprises" and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitations, an element qualified by the statement "comprising a ..." does not preclude the presence of additional identical elements in the process, method or apparatus comprising the element. Herein, what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other. For the method, product, etc. disclosed in the embodiment, if it corresponds to the method part disclosed in the embodiment, then the relevant part can refer to the description of the method part.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software may depend on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functions using different methods for each specific application, but such implementation should not be considered as exceeding the scope of the disclosed embodiments. Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units may only be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or may be Integrate into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms. A unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the disclosure. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more executable instruction. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

Claims (10)

1. A method for regulating the exhaust superheat of heat pump equipment, characterized in that the heat pump equipment includes a liquid storage device, and the method comprises: Obtaining the exhaust superheat degree of the compressor of the heat pump equipment, and the operation mode of the heat pump equipment, the operation mode includes a heating mode and a cooling mode; According to the operating mode and the degree of superheat of the exhaust gas, determine the refrigerant storage rate or refrigerant release rate of the liquid storage device, the refrigerant storage rate corresponds to the heating mode, and the refrigerant release rate corresponds to the Corresponding to the cooling mode; The flow control valve used to control the liquid storage device is adjusted to an opening corresponding to the refrigerant storage speed or refrigerant release speed. 2. The method according to claim 1, wherein, according to the operating mode and the exhaust superheat, determining the refrigerant storage rate or refrigerant release rate of the liquid storage device includes: Obtain the current amount of refrigerant in the liquid storage device; Obtain the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount; The refrigerant storage rate or the refrigerant release rate of the liquid storage device is determined according to the refrigerant amount difference and the exhaust gas superheat. 3. The method according to claim 2, wherein determining the refrigerant storage rate or the refrigerant release rate of the liquid storage device according to the refrigerant amount difference and the exhaust gas superheat includes: obtaining the refrigerant storage rate or the refrigerant release rate corresponding to the exhaust gas superheat; According to the refrigerant storage rate or the refrigerant release rate, an estimated time period for the refrigerant amount difference to become zero is obtained; If the estimated duration is less than the set duration, the refrigerant storage rate or the refrigerant release rate is re-determined according to the refrigerant amount difference and the set duration, so that the refrigerant amount difference becomes A new estimated duration of zero is greater than or equal to the set duration. 4. The method according to claim 3, wherein obtaining the refrigerant storage rate or the refrigerant release rate corresponding to the exhaust gas superheat comprises: In the heating mode, if the degree of superheat of the exhaust gas is greater than the first set temperature, determine the storage rate of the refrigerant as the first storage rate; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature , then it is determined that the refrigerant storage rate is the second storage rate, wherein the first storage rate is greater than the second storage rate; In the cooling mode, if the degree of superheat of the exhaust gas is greater than the second set temperature, the release rate of the refrigerant is determined to be the first release rate; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature, Then it is determined that the refrigerant release rate is the second release rate, wherein the first release rate is smaller than the second release rate. 5. The method according to claim 2, wherein obtaining the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount comprises: In the heating mode, the difference between the first set refrigerant amount and the current refrigerant amount is determined as the refrigerant amount difference; In cooling mode, determining the difference between the current refrigerant amount and the second set refrigerant amount as the refrigerant amount difference; Wherein, the first set amount of refrigerant is greater than the second set amount of refrigerant. 6. The method according to claim 2, further comprising: If the refrigerant amount difference is less than or equal to the set refrigerant amount difference, the refrigerant storage rate or the refrigerant release rate is determined to be zero. 7. The method according to any one of claims 1 to 6, further comprising: When the degree of superheat of the exhaust gas is greater than the set temperature, reduce the frequency of the compressor, and/or increase the fan speed of the heat pump device; When the degree of superheat of the exhaust gas is less than or a set temperature, increase the frequency of the compressor, and/or decrease the speed of the fan of the heat pump device. 8. A device for adjusting the degree of superheat of exhaust gas from heat pump equipment, characterized in that the heat pump equipment includes a liquid storage device, and the device includes: An obtaining module configured to obtain the exhaust superheat degree of the compressor of the heat pump device, and the operation mode of the heat pump device, and the operation mode includes a heating mode and a cooling mode; The first determination module is configured to determine a refrigerant storage rate or a refrigerant release rate of the liquid storage device according to the operation mode and the exhaust superheat, the refrigerant storage rate corresponds to the heating mode, The release rate of the refrigerant corresponds to the cooling mode; The first control module is configured to adjust the flow control valve used to control the liquid storage device to an opening degree corresponding to the refrigerant storage speed or the refrigerant release speed. 9. A device for adjusting the exhaust superheat of heat pump equipment, comprising a processor and a memory storing program instructions, characterized in that, the processor is configured to perform as claimed in claim 1 when executing the program instructions. The method for adjusting the exhaust superheat degree of heat pump equipment described in any one of 1 to 7. 10. A heat pump device, characterized in that it comprises the device for adjusting the degree of superheat of exhaust gas from the heat pump device according to claim 8 or 9.

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