CN111426030A - Control method of fixed frequency air conditioner in heating state - Google Patents

Abstract

The invention relates to the technical field of air conditioners, in particular to a control method of a fixed-frequency air conditioner in a heating state. The invention aims to solve the problem that the comfort of a user is reduced due to large fluctuation of the rotating speed of an indoor fan in the conventional control method of the fixed-frequency air conditioner. For the purpose, the control method of the fixed-frequency air conditioner in the heating state provided by the invention determines the target superheat degree based on the acquired actual outdoor environment temperature, and adjusts the flow of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree. Therefore, the purpose of changing the heating quantity or the heating effect of the air conditioner can be realized without adjusting the wind speed of the fan of the indoor unit, so that the wind speed of the hot wind of the indoor unit can be stably kept in a range suitable for a user. Meanwhile, the frequency of repeated halt of the compressor can be reduced, and the service life of the compressor is prolonged.

Description

Control method of fixed frequency air conditioner in heating state

technical field

The invention relates to the technical field of air conditioners, in particular to a control method of a fixed frequency air conditioner in a heating state.

Background technique

When the fixed-frequency air conditioner is working, the operating frequency of the compressor is basically unchanged. When the indoor temperature reaches the temperature set by the user, the air conditioner will automatically stop, and the indoor temperature is adjusted by continuously "on and off" the compressor.

The control method of the traditional fixed frequency air conditioner is to control the rotational speed of the indoor fan and the outdoor fan according to the indoor temperature, the inner coil temperature and the outdoor ambient temperature. However, the temperature of the air outlet of the fixed-frequency air conditioner is a key factor in determining the comfort of the air conditioner user. The large fluctuation of the rotational speed of the indoor fan causes the large fluctuation of the wind speed, thereby reducing the comfort of the user. At the same time, in the current control method of fixed-frequency air conditioners, under the conditions determined by the outdoor unit and the electronic expansion valve, there must be a strict type of indoor unit to match it, which limits the user's choice.

Accordingly, there is a need in the art for a new control method for a fixed-frequency air conditioner to solve the above problems.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, that is, in order to solve the problem that the fluctuation of the rotational speed of the indoor fan in the existing fixed-frequency air conditioner control method causes the user's comfort to decrease, the present invention provides a fixed-frequency heating state. Air conditioner control method.

The present invention provides a control method for a fixed-frequency air conditioner in a heating state, comprising: acquiring an actual outdoor ambient temperature; determining a target superheat degree based on the actual outdoor ambient temperature; adjusting the fixed-frequency air conditioner based on the target superheat degree The flow of medium refrigerant.

As a preferred technical solution of the above-mentioned control method provided by the present invention, the step of "determining the target superheat degree based on the actual outdoor ambient temperature" specifically includes: taking the actual outdoor ambient temperature as a retrieval item, in a preset The target superheat degree is queried in the corresponding relationship between the outdoor ambient temperature and the target superheat degree.

As a preferred technical solution of the above-mentioned control method provided by the present invention, the corresponding relationship includes a plurality of outdoor ambient temperature ranges and a target superheat degree corresponding to each of the plurality of outdoor ambient temperature ranges; The step of querying the target degree of superheat in the corresponding relationship between the set outdoor ambient temperature and the target degree of superheat specifically includes: determining the target degree of superheat by comparing the actual outdoor ambient temperature with the end value of each outdoor ambient temperature range. The outdoor ambient temperature range where the actual outdoor ambient temperature is located; and the target superheat degree is determined based on the outdoor ambient temperature range where the actual outdoor ambient temperature is located.

As a preferred technical solution of the above control method provided by the present invention, the corresponding relationship is set in the form of a lookup table or a function.

As a preferred technical solution of the above-mentioned control method provided by the present invention, the step of "adjusting the flow rate of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree" specifically includes: obtaining the actual discharge temperature of the compressor; The exhaust temperature calculates the actual superheat degree of the fixed-frequency air conditioner; compares the actual superheat degree with the target superheat degree; controls the opening degree of the electronic expansion valve based on the actual superheat degree and the target superheat degree to adjust the Describe the flow rate of the refrigerant in the fixed frequency air conditioner.

As a preferred technical solution of the above control method provided by the present invention, "control the opening degree of the electronic expansion valve based on the actual superheat degree and the target superheat degree so as to adjust the flow rate of the refrigerant in the fixed frequency air conditioner" The step specifically includes: if the actual degree of superheat is less than the target degree of superheat, reducing the opening degree of the electronic expansion valve; and/or, if the actual degree of superheat is greater than the target degree of superheat, increasing The opening of the electronic expansion valve.

As a preferred technical solution of the above control method provided by the present invention, the step of "compare the actual degree of superheat and the target degree of superheat" specifically includes: calculating the difference between the actual degree of superheat and the target degree of superheat ; The step of "controlling the opening of the electronic expansion valve based on the actual degree of superheat and the target degree of superheat so as to adjust the flow of the refrigerant in the fixed-frequency air conditioner" further comprises: based on the actual degree of superheat and the target degree of superheat The difference value of the target superheat degree is determined, and the numerical value of reducing/increasing the opening degree of the electronic expansion valve is determined.

As a preferred technical solution of the above control method provided by the present invention, the fixed-frequency air conditioner includes a duct machine, an embedded machine or a cabinet machine, and the corresponding relationship includes different correspondences for the duct machine, the embedded machine or the cabinet machine relation.

As a preferred technical solution of the above-mentioned control method provided by the present invention, the control method further comprises: before determining the target superheat degree based on the actual outdoor ambient temperature, determining the type of the fixed-frequency air conditioner; The step of querying the target degree of superheat in the corresponding relationship between the outdoor ambient temperature and the target degree of superheat specifically includes: in a preset corresponding relationship between the outdoor ambient temperature of the fixed-frequency air conditioner and the target degree of superheat. Query the target superheat in .

As a preferred technical solution of the above control method provided by the present invention, the step of "determining the type of the fixed frequency air conditioner" specifically includes: determining the type of the fixed frequency air conditioner according to detected user input information.

The control method of the fixed frequency air conditioner provided by the present invention determines the target superheat based on the obtained actual outdoor ambient temperature, and adjusts the flow rate of the refrigerant in the fixed frequency air conditioner based on the target superheat. Therefore, without adjusting the wind speed of the indoor unit fan, the purpose of changing the heating amount or the heating effect of the air conditioner can be achieved, so that the wind speed of the indoor unit can be stably maintained within a suitable range for the user. At the same time, it can also reduce the number of repeated shutdowns of the compressor and prolong the service life of the compressor.

Further, the control method for a fixed-frequency air conditioner in a heating state provided by the present invention also uses the actual outdoor ambient temperature as a retrieval item to query the target superheat degree in the preset corresponding relationship between the outdoor ambient temperature and the target superheat degree, Therefore, the purpose of determining the target superheat degree based on the actual outdoor ambient temperature is realized, which provides convenience for adjusting the flow rate of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree, so that the hot air of the indoor unit can be better realized through the control method. The wind speed can be stably maintained within a suitable range for the user, and the same outdoor unit can be matched with different types of indoor units.

Description of drawings

The control method of the fixed-frequency air conditioner in the heating state of the present invention will be described below with reference to the accompanying drawings. In the attached picture:

1 is a schematic flowchart of a control method for a fixed-frequency air conditioner in a heating state of the present embodiment;

FIG. 2 is a schematic flowchart of a specific implementation of step S2 of the present embodiment;

FIG. 3 is a schematic flowchart of a specific implementation of step S3 in this embodiment.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the end value of the outdoor ambient temperature range and the target superheat degree corresponding to the air duct machine, embedded machine or cabinet machine in this embodiment are described with specific values, the definition of the outdoor ambient temperature range, as well as the duct machine, The value of the target superheat degree corresponding to the embedded machine or the cabinet machine is not static in practice, and should not be construed as a limitation on the protection scope of the present invention. Make adjustments to suit the specific application.

A method for controlling a fixed-frequency air conditioner in a heating state provided by this embodiment, as shown in FIG. 1 , includes:

S1. Obtain the actual outdoor ambient temperature;

S2. Determine the target superheat based on the actual outdoor ambient temperature;

S3. Adjust the flow rate of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree.

In the control method for a fixed-frequency air conditioner in a heating state provided by this embodiment, a target superheat degree is determined based on the obtained actual outdoor ambient temperature, and the flow rate of the refrigerant in the fixed-frequency air conditioner is adjusted based on the target superheat degree. Therefore, without adjusting the wind speed of the indoor unit fan, the purpose of changing the heating amount or heating effect of the air conditioner can be achieved, so that the wind speed of the hot air of the indoor unit can be stably maintained within a suitable range for the user. At the same time, it can also reduce the number of repeated shutdowns of the compressor and prolong the service life of the compressor.

Wherein, the step of "determining the target superheat degree based on the actual outdoor ambient temperature" in step S2 specifically includes: taking the actual outdoor ambient temperature as a retrieval item, and querying the corresponding relationship between the preset outdoor ambient temperature and the target superheat degree Target superheat.

The control method for a fixed-frequency air conditioner in a heating state provided by this embodiment also uses the actual outdoor ambient temperature as a retrieval item to query the target superheat degree in the corresponding relationship between the preset outdoor ambient temperature and the target superheat degree, thereby realizing The purpose of determining the target superheat degree based on the actual outdoor ambient temperature provides convenience for adjusting the flow rate of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree, so that the wind speed of the indoor unit can be stably controlled by this control method. It can be kept within a suitable range for users, and the same outdoor unit can be matched with different types of indoor units.

As a preferred implementation of the above-mentioned control method provided in this embodiment, the above-mentioned corresponding relationship includes a plurality of outdoor ambient temperature ranges and a target superheat degree corresponding to each of the plurality of outdoor ambient temperature ranges; thus, as shown in FIG. 2, step S2 specifically includes:

S21. Determine the outdoor ambient temperature range where the actual outdoor ambient temperature is located by comparing the actual outdoor ambient temperature with the end value of each outdoor ambient temperature range;

S22. Determine the target superheat degree based on the outdoor ambient temperature range where the actual outdoor ambient temperature is located.

As a preferred implementation of the above control method provided in this embodiment, the corresponding relationship may be set in the form of a lookup table or a function. For example, it can be expressed in functional form as:

Among them, a, b, and c are the target superheat degrees corresponding to different outdoor ambient temperature ranges. According to different types of air conditioners and different specifications of the same type of air conditioners, the target superheat degrees can be set to different values, -5°C and 7°C. °C is the end value of the outdoor ambient temperature range (this is just an example, not the only one in practice).

As a preferred implementation of the above-mentioned control method provided in this embodiment, as shown in FIG. 3 , the step of “adjusting the flow rate of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree” in step S3 specifically includes:

S31. Obtain the actual exhaust temperature of the compressor;

S32. Calculate the actual superheat degree of the fixed-frequency air conditioner based on the actual exhaust temperature;

S33. Compare the actual superheat degree with the target superheat degree;

S34 , control the opening degree of the electronic expansion valve based on the magnitude of the actual superheat degree and the target superheat degree to adjust the flow rate of the refrigerant in the fixed frequency air conditioner.

The actual superheat degree is the actual discharge superheat degree of the compressor, and the calculation method is: actual discharge superheat degree = actual discharge temperature of the compressor - saturation temperature corresponding to the actual discharge pressure. By controlling the opening of the electronic expansion valve to adjust the flow of the refrigerant in the fixed frequency air conditioner, the actual exhaust superheat of the compressor can be adjusted to the target superheat degree to ensure the heating effect of the fixed frequency air conditioner.

As a preferred implementation of the above control method provided in this embodiment, the step of “controlling the opening of the electronic expansion valve based on the actual superheat degree and the target superheat degree in order to adjust the flow of the refrigerant in the fixed-frequency air conditioner” in step S34 specifically includes : If the actual degree of superheat is less than the target degree of superheat, reduce the opening of the electronic expansion valve, which essentially reduces the flow of refrigerant, that is, reduces the heating capacity of the fixed-frequency air conditioner; and/or, if the actual degree of superheat is greater than the target degree of superheat If the heat is increased, the opening of the electronic expansion valve is increased, which is essentially to increase the flow of the refrigerant, that is, to increase the heating capacity of the fixed-frequency air conditioner. The indoor temperature can be adjusted by controlling the opening of the electronic expansion valve, so that the wind speed of the hot air of the indoor unit can be stably maintained within the user-friendly range without adjusting the wind speed of the indoor unit fan. At the same time, it can also reduce the number of repeated shutdowns of the compressor and prolong the service life of the compressor.

As another preferred implementation of the above control method provided in this embodiment, the step of "compare the magnitude of the actual superheat degree and the target superheat degree" in step S32 specifically includes: calculating the difference between the actual superheat degree and the target superheat degree; step The step of S34 "control the opening degree of the electronic expansion valve based on the actual degree of superheat and the target degree of superheat so as to adjust the flow rate of the refrigerant in the fixed frequency air conditioner" further includes: based on the difference between the actual degree of superheat and the target degree of superheat, determine whether to reduce/ Increase the numerical value of the opening degree of the electronic expansion valve.

As a preferred implementation of the above control method provided in this embodiment, the fixed frequency air conditioner includes a duct machine, an embedded machine or a cabinet machine, and the corresponding relationship includes different types of air duct machines, embedded machines or cabinet machines. Correspondence. For example, the corresponding relationship between the actual outdoor ambient temperature of the duct machine, embedded machine or cabinet machine and the target superheat degree can be expressed as the relationship shown in Table 1:

Table 1

The above illustrates by way of enumeration that for different types of indoor units of air duct units, embedded units or cabinet units, under the condition that the actual outdoor ambient temperature is the same or falls within the same outdoor ambient temperature range, you can set different targets to pass the indoor unit. The heat is used to adjust the flow of the refrigerant in the fixed-frequency air conditioner to realize the adjustment of the indoor temperature. And since different target superheat degrees are set for the same actual outdoor ambient temperature of different indoor units or belong to the same outdoor ambient temperature range, and adjusting the flow of refrigerant in the fixed-frequency air conditioner based on the target superheat degree can change the heating capacity of the air conditioner. , so that the problem that the same outdoor unit and different types of indoor units are difficult to match and use can also be solved.

As a preferred implementation of the above control method provided in this embodiment, the control method further includes: in step S2 "before determining the target superheat degree based on the actual outdoor ambient temperature", determining the type of fixed-frequency air conditioner; The step of querying the target superheat degree in the corresponding relationship between the determined outdoor ambient temperature and the target superheat degree” specifically includes: in the preset corresponding relationship between the outdoor ambient temperature of the fixed-frequency air conditioner and the target superheat degree that is determined in advance Query the target superheat.

As a preferred implementation of the above control method provided in this embodiment, the step of "determining the type of the fixed-frequency air conditioner" specifically includes: determining the type of the fixed-frequency air conditioner according to detected user input information. For example, the user can select and confirm the type of the indoor unit in the air conditioner at the initial stage of installation of the air conditioner.

Of course, the above-mentioned alternative embodiments, as well as between the alternative embodiments and the preferred embodiments, can also be used in cross-combination, so that new embodiments can be combined to be suitable for more specific application scenarios.

It should be noted that although the detailed steps of the method of the present invention are described in detail above, those skilled in the art can combine, split and exchange the order of the above steps without departing from the basic principle of the present invention, so that The modified technical solution does not change the basic idea of the present invention, and therefore also falls within the protection scope of the present invention. For example, the above embodiment is described with the example of “determining the type of fixed-frequency air conditioner before determining the target superheat degree based on the actual outdoor ambient temperature in step S2”, wherein the step of “determining the type of fixed-frequency air conditioner” can be in Before, after, or simultaneously with step S1.

It should be understood by those skilled in the art that the control method for a fixed-frequency air conditioner in a heating state provided in this embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute some steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

Furthermore, it will be understood by those skilled in the art that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that a combination of features of different embodiments is meant to be within the protection of the present invention range and form different embodiments. For example, in the claims of this invention, any of the claimed embodiments may be used in any combination.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A control method of a fixed-frequency air conditioner in a heating state is characterized by comprising the following steps:

acquiring actual outdoor environment temperature;

determining a target superheat degree based on the actual outdoor ambient temperature;

and adjusting the flow of the refrigerant in the fixed-frequency air conditioner based on the target superheat degree.

2. The control method according to claim 1, wherein the step of determining the target degree of superheat based on the actual outdoor ambient temperature specifically comprises:

and inquiring the target superheat degree in a preset corresponding relation between the outdoor environment temperature and the target superheat degree by taking the actual outdoor environment temperature as a retrieval item.

3. The control method according to claim 2, wherein the correspondence includes a plurality of outdoor-environment-temperature ranges and one target degree of superheat corresponding to each of the plurality of outdoor-environment-temperature ranges;

the step of "inquiring the target degree of superheat in the preset correspondence between the outdoor ambient temperature and the target degree of superheat" specifically includes:

determining an outdoor environment temperature range within which the actual outdoor environment temperature is located by comparing the actual outdoor environment temperature with the end value of each outdoor environment temperature range;

and determining the target superheat degree based on the outdoor environment temperature range in which the actual outdoor environment temperature is.

4. Control method according to claim 2, characterized in that the correspondence is provided in the form of a look-up table or a function.

5. The control method according to claim 1, wherein the step of "adjusting the flow rate of refrigerant in the constant-frequency air conditioner based on the target superheat degree" specifically includes:

acquiring the actual exhaust temperature of the compressor;

calculating the actual superheat degree of the fixed-frequency air conditioner based on the actual exhaust temperature;

comparing the actual degree of superheat with the target degree of superheat;

and controlling the opening degree of the electronic expansion valve based on the actual superheat degree and the target superheat degree so as to adjust the flow of the refrigerant in the fixed-frequency air conditioner.

6. The control method according to claim 5, wherein the step of controlling the opening degree of the electronic expansion valve based on the actual superheat degree and the target superheat degree so as to adjust the flow rate of refrigerant in the fixed-frequency air conditioner specifically comprises:

if the actual superheat degree is smaller than the target superheat degree, reducing the opening degree of the electronic expansion valve; and/or

And if the actual superheat degree is larger than the target superheat degree, increasing the opening degree of the electronic expansion valve.

7. The control method according to claim 6, wherein the step of "comparing the actual degree of superheat with the target degree of superheat" specifically includes:

calculating the difference value between the actual superheat degree and the target superheat degree;

the step of "controlling the opening degree of the electronic expansion valve based on the actual superheat degree and the target superheat degree so as to adjust the flow rate of refrigerant in the fixed-frequency air conditioner" further includes:

determining a magnitude of a value of decreasing/increasing the opening degree of the electronic expansion valve based on a difference between the actual superheat degree and the target superheat degree.

8. The control method according to any one of claims 2 to 7, wherein the fixed-frequency air conditioner includes a duct type air conditioner, an embedded type air conditioner, or a cabinet type air conditioner, and the correspondence relationship includes different correspondence relationships for the duct type air conditioner, the embedded type air conditioner, or the cabinet type air conditioner.

9. The control method according to claim 8, characterized by further comprising:

determining a type of the fixed frequency air conditioner before determining a target degree of superheat based on the actual outdoor ambient temperature;

the step of "inquiring the target degree of superheat in the preset correspondence between the outdoor ambient temperature and the target degree of superheat" specifically includes:

and inquiring the target superheat degree in a preset corresponding relation between the outdoor environment temperature of the fixed-frequency air conditioner and the target superheat degree.

10. The control method according to claim 9, wherein the step of determining the type of the fixed-frequency air conditioner specifically comprises:

determining the type of the fixed-frequency air conditioner according to the detected user input information.

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