CN110388776B

CN110388776B - Operation control method and equipment for low-temperature refrigerant heating equipment

Info

Publication number: CN110388776B
Application number: CN201910706146.0A
Authority: CN
Inventors: 申传涛; 焦华超; 张仕强; 武连发
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-07-07
Anticipated expiration: 2039-08-01
Also published as: CN110388776A

Abstract

The disclosure provides a control method and a controller for refrigerant heating equipment and the refrigerant heating equipment, and relates to the technical field of refrigerant circulation heating. The control method comprises the following steps: acquiring the outdoor environment temperature and/or the exhaust temperature of a compressor of the refrigerant heating equipment after the compressor operates for a preset time; and under the condition that the outdoor environment temperature is less than or equal to the first threshold value or the exhaust temperature is less than or equal to the second threshold value, executing an auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment. According to the method and the device, the temperature of the refrigerant is improved by executing the auxiliary control mode, so that the mixed viscosity of the refrigerant and lubricating oil is reduced, the resistance of the compressor during starting is reduced, and the running pressure of the system is reduced.

Description

Operation control method and equipment for low-temperature refrigerant heating equipment

Technical Field

The disclosure relates to the technical field of refrigerant circulation heating, and in particular relates to an operation control method and equipment of refrigerant heating equipment at low temperature.

Background

In the related art, the refrigerant heating apparatus may be a system having a heating function using a compressor and a refrigerant, such as an air conditioning unit or a multi-split air conditioning apparatus. These devices may suffer from difficulty in starting the compressor at ultra-low temperatures.

Disclosure of Invention

The inventor of the disclosure finds that the refrigerant heating equipment may face the problem of difficult starting of the compressor when being started under the ultralow temperature working condition; alternatively, even if the engine is started, the viscosity of the refrigerant and the lubricating oil is high at a low temperature for the first time, which makes the operation of the compressor difficult and prevents the refrigerant from being circulated for a long time.

In view of this, the present disclosure provides a control method for a refrigerant heating device to solve the problem that a compressor of the refrigerant heating device is difficult to start or operate under a low temperature condition.

According to an aspect of the embodiments of the present disclosure, there is provided a control method for a refrigerant heating apparatus, including: acquiring the outdoor environment temperature and/or the exhaust temperature of a compressor of the refrigerant heating equipment after the compressor operates for a preset time; and executing an auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment when the outdoor environment temperature is less than or equal to a first threshold value or the exhaust temperature is less than or equal to a second threshold value.

In some embodiments, the control method further comprises: detecting the exhaust superheat degree of the refrigerant heating equipment; and judging whether the exhaust superheat degree is larger than or equal to a third threshold value; if so, switching the operation mode of the refrigerant heating equipment from the auxiliary control mode to a normal operation mode, otherwise, continuing to execute the auxiliary control mode.

In some embodiments, the secondary control mode comprises: and starting an internal electric heating device of the refrigerant heating equipment.

In some embodiments, the secondary control mode further comprises: and controlling an inner fan of the refrigerant heating equipment to execute a reverse rotation mode.

In some embodiments, the secondary control mode comprises: and opening an internal machine electronic expansion valve connected with an internal machine heat exchanger in the refrigerant heating equipment to a preset opening range.

In some embodiments, the predetermined opening degree range includes a maximum opening degree of the internal machine electronic expansion valve.

In some embodiments, the secondary control mode comprises: opening the operating frequency of the compressor to a predetermined frequency range.

In some embodiments, the predetermined frequency range includes a maximum operating frequency of the compressor.

In some embodiments, the step of detecting the degree of superheat of the exhaust gas of the refrigerant heating device includes: acquiring the exhaust temperature and the system high-pressure temperature of the refrigerant heating equipment after an auxiliary control mode is executed; and calculating the exhaust superheat degree according to the exhaust temperature of the refrigerant heating equipment after the auxiliary control mode is executed and the system high-pressure temperature, wherein the exhaust superheat degree is the difference value between the exhaust temperature and the system high-pressure temperature.

In some embodiments, the control method further comprises: and executing a normal operation mode under the condition that the outdoor environment temperature is greater than the first threshold value and the exhaust temperature of the compressor after the preset time is operated is greater than a second threshold value.

In some embodiments, the refrigerant heating device is an air conditioning unit.

According to another aspect of the embodiments of the present disclosure, there is provided a controller including: the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the outdoor environment temperature and/or the exhaust temperature of a compressor of the refrigerant heating equipment after the compressor operates for a preset time; and a mode execution unit, configured to execute an auxiliary control mode to increase a temperature of a refrigerant in the refrigerant heating apparatus when the outdoor environment temperature is less than or equal to a first threshold, or the discharge temperature is less than or equal to a second threshold.

In some embodiments, the controller further comprises: the detection unit is used for detecting the exhaust superheat degree of the refrigerant heating equipment; the mode execution unit switches the operation mode of the refrigerant heating equipment from the auxiliary control mode to a normal operation mode under the condition that the exhaust superheat degree is larger than or equal to a third threshold value; in the case where the degree of superheat of exhaust gas is smaller than the third threshold value, the mode execution unit continues to execute the assist control mode.

In some embodiments, the obtaining unit is configured to obtain an exhaust temperature and a system high-pressure temperature of the refrigerant heating apparatus after the refrigerant heating apparatus executes the auxiliary control mode; the detection unit is used for calculating the exhaust superheat degree according to the exhaust temperature of the refrigerant heating equipment after the auxiliary control mode is executed and the system high-pressure temperature, wherein the exhaust superheat degree is the difference value between the exhaust temperature and the system high-pressure temperature.

In some embodiments, the mode execution unit is further configured to execute the normal operation mode if the outdoor ambient temperature is greater than the first threshold and the discharge temperature of the compressor after the predetermined time of operation is greater than a second threshold.

According to another aspect of the embodiments of the present disclosure, there is provided a controller including: a memory; and a processor coupled to the memory, the processor configured to perform the method as previously described based on instructions stored in the memory.

According to another aspect of the embodiments of the present disclosure, there is provided a refrigerant heating apparatus including: a controller as hereinbefore described.

In some embodiments, the refrigerant heating apparatus further includes: the first temperature sensor is electrically connected with the controller and used for collecting the outdoor environment temperature and transmitting the outdoor environment temperature to the controller; and the second temperature sensor is electrically connected with the controller and is used for collecting the exhaust temperature of the refrigerant heating equipment and transmitting the exhaust temperature to the controller.

In some embodiments, the refrigerant heating apparatus further includes: the compressor, the inner machine electric heating device, the inner fan and the inner machine electronic expansion valve are respectively electrically connected with the controller.

According to another aspect of embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method as previously described.

In the control method, when the outdoor environment temperature is less than or equal to the first threshold, or the exhaust temperature of the compressor of the refrigerant heating equipment after the compressor operates for a predetermined time is less than or equal to the second threshold, the auxiliary control mode is executed to increase the temperature of the refrigerant in the refrigerant heating equipment. In this way, when the refrigerant heating equipment is in heating start or the compressor is difficult to operate at low temperature, the auxiliary control mode is executed to increase the temperature of the refrigerant, so that the mixed viscosity of the refrigerant and the lubricating oil is reduced, the resistance of the compressor during start or operation is reduced, and the system operation pressure is further reduced.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram illustrating a refrigerant heating apparatus according to some embodiments;

fig. 2 is a flowchart illustrating a control method for a refrigerant heating apparatus according to some embodiments of the present disclosure;

fig. 3 is a flowchart illustrating a control method for a refrigerant heating apparatus according to other embodiments of the present disclosure;

FIG. 4 is a schematic diagram illustrating a structure of a controller according to some embodiments of the present disclosure;

FIG. 5 is a schematic diagram illustrating a configuration of a controller according to further embodiments of the present disclosure;

FIG. 6 is a schematic diagram illustrating a configuration of a controller according to further embodiments of the present disclosure;

fig. 7 is a schematic structural diagram illustrating a refrigerant heating apparatus according to some embodiments of the present disclosure.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The inventor of the disclosure finds that the refrigerant heating equipment may face the problem of difficult starting of the compressor when being started under the ultralow temperature working condition; alternatively, even if the engine is started, the viscosity of the refrigerant and the lubricating oil is high at a low temperature for the first time, which makes the operation of the compressor difficult and prevents the refrigerant from being circulated for a long time. Therefore, the user experience is poor, also affecting the compressor life.

Fig. 1 is a schematic structural diagram illustrating a refrigerant heating apparatus according to some embodiments. For example, the refrigerant heating apparatus may be an air conditioning unit.

As shown in fig. 1, the refrigerant heating apparatus may include an indoor unit 110 and an outdoor unit 120. The indoor unit 110 may include an indoor unit electric heating device (e.g., an electric heating belt) 111, an indoor fan 112, an indoor unit heat exchanger 113, and an indoor unit electronic expansion valve 114.

The inner electric heater 111, the inner fan 112 and the inner electronic expansion valve 114 may be electrically connected to and controlled by a controller (not shown in fig. 1).

The internal electric heating device 111 can perform a heating function after being electrified.

The inner blower 112 may function as a blower after being energized. The inner fan may include a forward mode and a reverse mode. In the forward rotation mode, the blades of the inner fan 112 rotate forward to blow out heat generated by the inner electric heating device after being electrified, so that the indoor temperature can be increased. In the reverse rotation mode, the blades of the inner fan 112 are reversed, so that a part of heat generated by the inner electric heating device after being electrified can be absorbed to increase the temperature of the refrigerant. For example, in the reverse mode, the inner fan may blow heat generated by the inner machine electric heating device onto the inner machine heat exchanger.

The indoor unit electronic expansion valve 114 is connected to the indoor unit heat exchanger 113 through a pipeline. The indoor unit electronic expansion valve can control the flow rate and the speed of the refrigerant flowing through the indoor unit electronic expansion valve through the opening degree of the indoor unit electronic expansion valve.

For example, in the case of heating in the refrigerant heating equipment, the indoor heat exchanger 113 functions as a condenser.

As shown in fig. 1, the outdoor unit 120 may include a compressor 121, an outdoor unit heat exchanger 122, an outdoor unit electronic expansion valve 123, and the like. For example, when the refrigerant heating device is heating, the outdoor unit heat exchanger 122 functions as an evaporator. Further, fig. 1 also shows an exhaust pipe 131, a liquid pipe 132, an intake pipe 133, and the like. Here, the compressor 121, the outdoor unit heat exchanger 122, the outdoor unit electronic expansion valve 123, the indoor unit heat exchanger 113, the indoor unit electronic expansion valve 114, the gas discharge pipe 131, the liquid pipe 132, the gas suction pipe 133, and the like constitute a refrigerant circulation system. That is, the refrigerant circulates in the refrigerant circulation system.

Fig. 2 is a flowchart illustrating a control method for a refrigerant heating apparatus according to some embodiments of the present disclosure. As shown in fig. 2, the control method may include steps S202 to S204.

In step S202, an outdoor ambient temperature and/or a discharge temperature of the refrigerant heating device after the compressor is operated for a predetermined time are obtained.

Here, the discharge temperature refers to a temperature of a refrigerant in the discharge pipe (for example, a temperature in the discharge pipe of the compressor). The predetermined time may be set according to actual conditions. For example, the predetermined time may be 10 minutes.

In step S204, when the outdoor ambient temperature is less than or equal to the first threshold, or the discharge temperature is less than or equal to the second threshold, the auxiliary control mode is executed to increase the temperature of the refrigerant in the refrigerant heating device. Here, the higher the temperature of the refrigerant, the lower the mixture viscosity of the refrigerant and the lubricating oil, and the lower the resistance to the start-up of the compressor, so that the system operation pressure becomes smaller.

For example, in the case where the outdoor ambient temperature is acquired, it may be determined whether the outdoor ambient temperature is less than or equal to the first threshold value. For another example, in the case where the above-described exhaust gas temperature is acquired, it may be determined whether the exhaust gas temperature is less than or equal to the second threshold value. For another example, in the case where the outdoor ambient temperature and the discharge air temperature are acquired, it may be determined whether the outdoor ambient temperature is less than or equal to the first threshold value, or whether the discharge air temperature is less than or equal to the second threshold value. And if the outdoor environment temperature is less than or equal to the first threshold value or the exhaust temperature is less than or equal to the second threshold value, executing an auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment.

In some embodiments, the first threshold may have a value range of: the first threshold value is less than or equal to-20 ℃. Of course, the value range of the first threshold is merely exemplary, and the scope of the disclosure is not limited thereto.

In some embodiments, the range of values of the second threshold may be: the second threshold value is more than or equal to 40 ℃ and less than or equal to 80 ℃. Of course, the value range of the second threshold is merely exemplary, and the scope of the disclosure is not limited thereto.

To this end, a control method for a refrigerant heating apparatus according to some embodiments of the present disclosure is provided. In the control method, when the outdoor environment temperature is less than or equal to a first threshold value or the exhaust temperature of the compressor of the refrigerant heating equipment after the compressor operates for a preset time is less than or equal to a second threshold value, an auxiliary control mode is executed to increase the temperature of the refrigerant in the refrigerant heating equipment. Thus, in the case where the compressor is difficult to start due to a low outdoor ambient temperature or difficult to operate due to a high resistance of the compressor for a long time, the temperature of the refrigerant is increased by performing the auxiliary control mode. The mixed viscosity of the refrigerant and the lubricating oil can be reduced, the resistance of the compressor during starting or running is reduced, the running pressure of the system is further reduced, and the problem that the compressor of the refrigerant heating equipment is difficult to start or run under the low-temperature condition is solved.

In some embodiments, the secondary control mode may include: and starting an internal electric heating device of the refrigerant heating equipment. For example, the internal machine electric heating device can be turned on completely. This can increase the temperature of the refrigerant, thereby reducing the mixed viscosity of the refrigerant and the lubricating oil.

In some embodiments, the auxiliary control mode may further include: and controlling an inner fan of the refrigerant heating equipment to execute a reverse rotation mode. Under the condition of starting the inner fan electric heating device, the inner fan executes a reverse rotation mode, and the heat generated by the inner fan electric heating device can be partially absorbed, so that the heating speed of the refrigerant is further accelerated. And the condensation of the refrigerant in the internal heat exchanger can be reduced, and the high temperature of the refrigerant is ensured to enter the liquid inlet pipe and return to the outdoor side.

In some embodiments, the secondary control mode comprises: and opening an internal machine electronic expansion valve connected with an internal machine heat exchanger in the refrigerant heating equipment to a preset opening range. The refrigerant can be circulated quickly by opening the electronic expansion valve of the internal unit to a preset opening range, so that the heating speed of the refrigerant is accelerated.

For example, the predetermined opening degree range may include a maximum opening degree of the internal machine electronic expansion valve. The refrigerant can be circulated quickly by opening the electronic expansion valve of the internal unit to the maximum opening degree, so that the heating speed of the refrigerant is accelerated.

The predetermined opening degree range may be a range of opening degrees lower than the maximum opening degree. The opening degrees within this opening degree range are all relatively large. For example, the opening degrees within the opening degree range may each be greater than an opening degree threshold (e.g., two-thirds of the maximum opening degree). This also has the effect of accelerating the refrigerant circulation and increasing the temperature of the refrigerant.

In some embodiments, the secondary control mode comprises: the operating frequency of the compressor is turned on to a predetermined frequency range. The running frequency of the compressor is opened to a preset frequency range, so that the circulation of the refrigerant can be accelerated, and the temperature rising speed of the refrigerant is accelerated.

For example, the predetermined frequency range may include a maximum operating frequency of the compressor. The maximum flow of the refrigerant can be ensured by opening the operating frequency of the compressor to the maximum operating frequency, so that the circulation speed of the refrigerant is accelerated, and the heating speed of the refrigerant is further accelerated.

It should be noted that the predetermined frequency range may be a frequency range lower than the maximum operating frequency. The operating frequencies within this frequency range are all relatively large. For example, the operating frequencies within the frequency range may each be greater than a frequency threshold (e.g., 90% of the maximum operating frequency). This also has the effect of accelerating the refrigerant circulation and increasing the temperature of the refrigerant.

In some embodiments, the control method may further include: detecting the exhaust superheat degree of refrigerant heating equipment; and judging whether the exhaust superheat degree is greater than or equal to a third threshold value; if so, switching the operation mode of the refrigerant heating equipment from the auxiliary control mode to the normal operation mode, otherwise, continuing to execute the auxiliary control mode.

Here, the normal operation mode refers to a normal mode when the refrigerant heating device is in a heating operation. In the normal operation mode, the refrigerant heating apparatus realizes heating by refrigerant circulation. For example, in the refrigerant circulation process, the high-temperature and high-pressure refrigerant gas can play a role in heat release through the condensation of the inner machine heat exchanger, so that heating is realized. The normal operation mode is a known heating mode of the refrigerant heating device, and therefore, a person skilled in the art can fully understand the specific operation process of the normal operation mode, and the detailed description is omitted here.

In some embodiments, the third threshold may range from: the third threshold value is more than or equal to 15 ℃ and less than or equal to 40 ℃. Of course, the value range of the third threshold is merely exemplary, and the scope of the disclosure is not limited thereto.

In some embodiments, the step of detecting the superheat degree of the exhaust gas of the refrigerant heating device may include: acquiring the exhaust temperature and the system high-pressure temperature of the refrigerant heating equipment after the auxiliary control mode is executed; and calculating the exhaust superheat degree according to the exhaust temperature of the refrigerant heating equipment after the auxiliary control mode is executed and the system high-pressure temperature. The exhaust superheat degree is the difference between the exhaust temperature and the system high-pressure temperature. That is, the degree of superheat of the exhaust gas is exhaust gas temperature — system high-pressure temperature. The high pressure temperature of the system is expressed in the unit of DEG C and can be converted according to the saturated steam pressure. For example, the system high pressure temperature may be represented by the saturated steam temperature.

In the above embodiment, the exhaust superheat degree is one of the parameters for displaying the capacity of the device, and a sufficient exhaust superheat degree generally represents that the refrigerant heating device can normally operate, and the higher the exhaust superheat degree is, the better the heating effect is. In order to prevent the over-high low pressure and the damage to the unit, the exhaust superheat degree is used as a judgment value to carry out a stop command of an auxiliary control mode, and the normal operation of the equipment is determined after the exhaust superheat degree is increased to a certain value.

In some embodiments, the control method may further include: and executing a normal operation mode under the condition that the outdoor environment temperature is greater than the first threshold value and the exhaust temperature of the compressor after the compressor operates for a preset time is greater than the second threshold value. That is, if the outdoor ambient temperature is greater than the first threshold value and the discharge temperature of the compressor after the compressor is operated for the predetermined time is greater than the second threshold value, the refrigerant heating device is enabled to heat according to the normal operation mode.

Fig. 3 is a flowchart illustrating a control method for a refrigerant heating apparatus according to other embodiments of the present disclosure. As shown in fig. 3, the control method may include steps S302 to S320.

In step S302, the outdoor ambient temperature and the discharge temperature after the compressor of the circulation heating apparatus is operated for a predetermined time are acquired.

In step S304, it is determined whether the outdoor ambient temperature is less than or equal to a first threshold, or the discharge temperature is less than or equal to a second threshold. If so, the process advances to steps S306 to S312; otherwise the process proceeds to step S314.

Here, steps S306 to S312 are specific operations of the assist control mode according to some embodiments of the present disclosure.

In step S306, the internal electric heating device is turned on.

In step S308, the inner fan is controlled to perform the reverse rotation mode.

In step S310, the internal electronic expansion valve is opened to the maximum opening degree.

In step S312, the operating frequency of the compressor is turned on to the maximum operating frequency.

Through the steps S306 to S312, the refrigerant circulation and the refrigerant temperature rise are accelerated.

In step S314, the normal operation mode is executed.

In step S316, the degree of superheat of the exhaust gas of the circulation heating apparatus is detected.

In step S318, it is determined whether the exhaust gas superheat degree is greater than or equal to a third threshold value. If so, the process proceeds to step S320; otherwise, the process returns to steps S306 to S312, i.e., the auxiliary control mode continues to be executed.

In step S320, the operation mode of the circulation heating apparatus is switched from the auxiliary control mode to the normal operation mode.

To this end, a control method for a refrigerant heating apparatus according to other embodiments of the present disclosure is provided. In the control method, the circulation of the refrigerant can be accelerated and the temperature rise of the refrigerant can be accelerated by starting the inner fan electric heating device, controlling the inner fan to execute a reverse rotation mode, starting the inner fan electronic expansion valve to the maximum opening degree and starting the running frequency of the compressor to the maximum running frequency. Therefore, the mixed viscosity of the refrigerant and the lubricating oil can be reduced, the resistance of the compressor during starting is reduced, and the running pressure of the system is further reduced.

The control method can solve the technical problems that the compressor is difficult to start due to high viscosity of the refrigerant and the lubricating oil under the ultralow temperature working condition, and the refrigerant of the system is difficult to effectively circulate in a short time. Moreover, after the refrigerant passes through the indoor unit at high temperature, the temperature of the refrigerant is increased (namely the low pressure of the system is increased) when the refrigerant flows back to the outdoor unit, and compared with the normal operation mode, the temperature of the refrigerant is shortened, so that the problem that the heating effect experience of users is poor in the early stage of the operation of the system can be solved, and the operation time of the unit with poor heating effect is shortened.

Fig. 4 is a schematic diagram illustrating a structure of a controller according to some embodiments of the present disclosure. As shown in fig. 4, the controller may include an acquisition unit 410 and a mode execution unit 420.

The obtaining unit 410 is configured to obtain an outdoor ambient temperature and/or a discharge temperature of the refrigerant heating device after a compressor operates for a predetermined time.

The mode executing unit 420 is configured to execute the auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating device when the outdoor environment temperature is less than or equal to the first threshold, or the exhaust temperature is less than or equal to the second threshold.

In this embodiment, a controller according to some embodiments of the present disclosure is provided. In the controller, the mode execution unit executes the auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment under the condition that the outdoor environment temperature is less than or equal to the first threshold or the exhaust temperature is less than or equal to the second threshold, so that the mixed viscosity of the refrigerant and the lubricating oil can be reduced, the resistance of the compressor during starting can be reduced, and the system operation pressure can be further reduced.

In some embodiments, the secondary control mode may include: and starting an internal electric heating device of the refrigerant heating equipment.

In some embodiments, the auxiliary control mode may further include: and controlling an inner fan of the refrigerant heating equipment to execute a reverse rotation mode.

In some embodiments, the secondary control mode may include: and opening an internal machine electronic expansion valve connected with an internal machine heat exchanger in the refrigerant heating equipment to a preset opening range. For example, the predetermined opening degree range includes a maximum opening degree of the internal machine electronic expansion valve.

In some embodiments, the secondary control mode may include: the operating frequency of the compressor is turned on to a predetermined frequency range. For example, the predetermined frequency range may include a maximum operating frequency of the compressor.

In some embodiments, as shown in fig. 4, the controller may further include a detection unit 430. The detection unit 430 is configured to detect an exhaust superheat degree of the refrigerant heating device. When the degree of superheat of the exhaust gas is greater than or equal to the third threshold, the mode execution unit 420 switches the operation mode of the refrigerant heating device from the auxiliary control mode to the normal operation mode. In the case where the degree of superheat of the exhaust gas is less than the third threshold value, the mode execution unit 420 continues to execute the assist control mode.

In some embodiments, the obtaining unit 410 is configured to obtain an exhaust temperature and a system high-pressure temperature of the refrigerant heating equipment after the auxiliary control mode is executed. The detecting unit 430 is configured to calculate an exhaust superheat degree according to an exhaust temperature of the refrigerant heating device after the auxiliary control mode is executed and a system high-pressure temperature. The exhaust superheat degree is the difference between the exhaust temperature and the system high-pressure temperature.

In some embodiments, the mode performing unit 420 may be further configured to perform the normal operation mode in a case where the outdoor ambient temperature is greater than a first threshold and the discharge temperature after the compressor is operated for a predetermined time is greater than a second threshold.

FIG. 5 is a schematic diagram illustrating a configuration of a controller according to further embodiments of the present disclosure. The controller includes a memory 510 and a processor 520. Wherein:

the memory 510 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used for storing the instructions in the embodiments corresponding to fig. 2 and/or fig. 3.

Processor 520 is coupled to memory 510 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 520 is configured to execute the instructions stored in the memory, and execute the auxiliary control mode at a low temperature or when the compressor is difficult to operate, so as to increase the temperature of the refrigerant in the refrigerant heating device, thereby reducing the mixed viscosity of the refrigerant and the lubricating oil, reducing the resistance when the compressor is started, and further reducing the system operating pressure.

In some embodiments, as also shown in fig. 6, the controller 600 includes a memory 610 and a processor 620. Processor 620 is coupled to memory 610 through a BUS 630. The controller 600 may also be coupled to an external storage device 650 via a storage interface 640 for accessing external data, and may also be coupled to a network or another computer system (not shown) via a network interface 660, which will not be described in detail herein.

In the embodiment, the data instruction is stored in the memory, the processor processes the instruction, and the auxiliary control mode is executed under the condition of low temperature or difficult operation of the compressor, so that the temperature of the refrigerant in the refrigerant heating equipment is increased, the mixed viscosity of the refrigerant and the lubricating oil can be reduced, the resistance when the compressor is started is reduced, and the system operation pressure is reduced.

In an embodiment of the present disclosure, a cooling medium heating apparatus may also be provided. The refrigerant heating device may include the controller (such as the controller shown in fig. 4, 5 or 6) as described above.

Fig. 7 is a schematic structural diagram illustrating a refrigerant heating apparatus according to some embodiments of the present disclosure. For example, the refrigerant heating apparatus may be an air conditioning unit. As shown in fig. 7, the refrigerant heating apparatus may include a controller 710. For example, the controller 710 may be the controller shown in FIG. 4, FIG. 5, or FIG. 6

In some embodiments, as shown in fig. 7, the refrigerant heating apparatus may further include a first temperature sensor 721 and a second temperature sensor 722.

The first temperature sensor 721 is electrically connected to the controller 710. The first temperature sensor may be provided at the outdoor unit. The first temperature sensor 721 is used to collect the outdoor ambient temperature and transmit the outdoor ambient temperature to the controller 710.

The second temperature sensor 722 is electrically connected to the controller 710. The second temperature sensor 722 may be provided on the exhaust pipe. The second temperature sensor 722 is used for collecting the exhaust temperature of the refrigerant heating equipment and transmitting the exhaust temperature to the controller. For example, the second temperature sensor may be a sensor provided in the unit or an external sensor.

In some embodiments, as shown in fig. 7, the refrigerant heating apparatus may further include: and the compressor 121, the inner electric heating device 111, the inner fan 112 and the inner electronic expansion valve 114 are respectively electrically connected with the controller 710. The controller 710 may output corresponding control signals to the compressor 121, the internal electric heater 111, the internal fan 112, and the internal electronic expansion valve 114, respectively, so as to control the compressor 121, the internal electric heater 111, the internal fan 112, and the internal electronic expansion valve 114 to perform corresponding operations, respectively.

In the refrigerant heating equipment of the embodiment of the disclosure, the inner fan is reversely matched with the inner electric heating device, so that the refrigerant in the copper pipe of the heat exchanger can be heated, the high-temperature refrigerant is condensed as little as possible at the indoor machine side, and then the high-temperature refrigerant can pass through the liquid pipe and enter the outdoor machine. Therefore, the temperature of the refrigerant and the lubricating oil in the whole system can be quickly increased, and the problems that the compressor is difficult to start and the flow resistance is large due to the large viscosity of the refrigerant and the lubricating oil at ultralow temperature are solved. The refrigerant circulates rapidly in the system, so that the user side cannot be in a poor heating state for a long time, and the user experience is improved.

In other embodiments, the present disclosure also provides a computer-readable storage medium on which computer program instructions are stored, the instructions implementing the steps of the method in the embodiment corresponding to fig. 2 and/or fig. 3 when executed by a processor. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A control method for a refrigerant heating device comprises the following steps:

acquiring the outdoor environment temperature and/or the exhaust temperature of a compressor of the refrigerant heating equipment after the compressor operates for a preset time; and

executing an auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment under the condition that the outdoor environment temperature is less than or equal to a first threshold value or the exhaust temperature is less than or equal to a second threshold value;

wherein the auxiliary control mode comprises: and starting an internal electric heating device of the refrigerant heating equipment, controlling an internal fan of the refrigerant heating equipment to execute a reverse rotation mode, and starting the running frequency of the compressor to a preset frequency range.

2. The control method according to claim 1, further comprising:

detecting the exhaust superheat degree of the refrigerant heating equipment; and

judging whether the exhaust superheat degree is larger than or equal to a third threshold value or not; if so, switching the operation mode of the refrigerant heating equipment from the auxiliary control mode to a normal operation mode, otherwise, continuing to execute the auxiliary control mode.

3. The control method according to claim 1 or 2, wherein,

the auxiliary control mode includes: and opening an internal machine electronic expansion valve connected with an internal machine heat exchanger in the refrigerant heating equipment to a preset opening range.

4. The control method according to claim 3,

the predetermined opening degree range includes a maximum opening degree of the internal machine electronic expansion valve.

5. The control method according to claim 1,

the predetermined frequency range includes a maximum operating frequency of the compressor.

6. The control method according to claim 1, wherein the step of detecting the degree of superheat of exhaust gas of the refrigerant heating device includes:

acquiring the exhaust temperature and the system high-pressure temperature of the refrigerant heating equipment after an auxiliary control mode is executed; and

and calculating the exhaust superheat degree according to the exhaust temperature of the refrigerant heating equipment after the auxiliary control mode is executed and the system high-pressure temperature, wherein the exhaust superheat degree is the difference value between the exhaust temperature and the system high-pressure temperature.

7. The control method according to claim 1, further comprising:

and executing a normal operation mode under the condition that the outdoor environment temperature is greater than the first threshold value and the exhaust temperature of the compressor after the preset time is operated is greater than a second threshold value.

8. The control method according to claim 1,

the refrigerant heating equipment is an air conditioning unit.

9. A controller, comprising:

the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the outdoor environment temperature and/or the exhaust temperature of a compressor of the refrigerant heating equipment after the compressor operates for a preset time; and

the mode execution unit is used for executing an auxiliary control mode to increase the temperature of the refrigerant in the refrigerant heating equipment under the condition that the outdoor environment temperature is less than or equal to a first threshold value or the exhaust temperature is less than or equal to a second threshold value;

10. The controller of claim 9, further comprising:

the detection unit is used for detecting the exhaust superheat degree of the refrigerant heating equipment;

the mode execution unit switches the operation mode of the refrigerant heating equipment from the auxiliary control mode to a normal operation mode under the condition that the exhaust superheat degree is larger than or equal to a third threshold value; in the case where the degree of superheat of exhaust gas is smaller than the third threshold value, the mode execution unit continues to execute the assist control mode.

11. The controller according to claim 9 or 10, wherein,

12. The controller of claim 11,

13. The controller of claim 9,

14. The controller of claim 10,

the acquisition unit is used for acquiring the exhaust temperature and the system high-pressure temperature of the refrigerant heating equipment after the auxiliary control mode is executed;

the detection unit is used for calculating the exhaust superheat degree according to the exhaust temperature of the refrigerant heating equipment after the auxiliary control mode is executed and the system high-pressure temperature, wherein the exhaust superheat degree is the difference value between the exhaust temperature and the system high-pressure temperature.

15. The controller of claim 9,

the mode execution unit is further used for executing a normal operation mode under the condition that the outdoor environment temperature is greater than the first threshold value and the exhaust temperature of the compressor after the preset time is greater than a second threshold value.

16. A controller, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the method of any of claims 1-8 based on instructions stored in the memory.

17. A refrigerant heating apparatus includes: a controller as claimed in any one of claims 9 to 16.

18. The apparatus for heating refrigerant according to claim 17, further comprising:

the first temperature sensor is electrically connected with the controller and used for collecting the outdoor environment temperature and transmitting the outdoor environment temperature to the controller; and

and the second temperature sensor is electrically connected with the controller and is used for collecting the exhaust temperature of the refrigerant heating equipment and transmitting the exhaust temperature to the controller.

19. The apparatus for heating refrigerant according to claim 17, further comprising:

the compressor, the inner machine electric heating device, the inner fan and the inner machine electronic expansion valve are respectively electrically connected with the controller.

20. The apparatus for heating a refrigerant according to claim 17,

the refrigerant heating equipment is an air conditioning unit.

21. A computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any one of claims 1 to 8.