Air conditioner and control method thereof

文档序号：166235 发布日期：2021-10-29 浏览：28次中文

阅读说明：本技术 一种空调器及其控制方法 (Air conditioner and control method thereof ) 是由王俊吴灿炎韩昕洋于 2021-08-05 设计创作，主要内容包括：本发明公开了一种空调器及其控制方法。所述空调器包括：依次连接后形成循环回路的压缩机、内机换热器、第一电子膨胀阀和外机换热器；热气旁通管路,接设在所述循环回路中且与所述外机换热器并联设置；旁通换热器,所述旁通换热器利用第二路制冷剂对第一路制冷剂进行换热升温,所述第一路制冷剂为经所述第一电子膨胀阀节流后的制冷剂,所述第二路制冷剂为所述热气旁通管路中的制冷剂。(The invention discloses an air conditioner and a control method thereof. The air conditioner includes: the compressor, the inner machine heat exchanger, the first electronic expansion valve and the outer machine heat exchanger are sequentially connected to form a circulation loop; the hot gas bypass pipeline is connected in the circulation loop and is connected with the outer machine heat exchanger in parallel; and the bypass heat exchanger utilizes a second path of refrigerant to carry out heat exchange and temperature rise on a first path of refrigerant, the first path of refrigerant is the refrigerant throttled by the first electronic expansion valve, and the second path of refrigerant is the refrigerant in the hot gas bypass pipeline.)

1. An air conditioner, characterized in that the air conditioner comprises:

the compressor, the inner machine heat exchanger, the first electronic expansion valve and the outer machine heat exchanger are sequentially connected to form a circulation loop;

the hot gas bypass pipeline is connected in the circulation loop and is connected with the outer machine heat exchanger in parallel;

and the bypass heat exchanger utilizes a second path of refrigerant to carry out heat exchange and temperature rise on a first path of refrigerant, the first path of refrigerant is the refrigerant throttled by the first electronic expansion valve, and the second path of refrigerant is the refrigerant in the hot gas bypass pipeline.

2. The air conditioner according to claim 1, wherein a first end of the hot gas bypass line is connected to the circulation circuit between the inner heat exchanger and the first electronic expansion valve, and a second end of the hot gas bypass line is connected to the circulation circuit between the compressor and the outer heat exchanger.

3. The air conditioner according to claim 1, wherein a first end of the hot gas bypass line is connected to the circulation circuit between the outlet of the compressor and the inner heat exchanger, and a second end of the hot gas bypass line is connected to the circulation circuit between the compressor and the outer heat exchanger.

4. The air conditioner according to claim 2 or 3, wherein the bypass heat exchanger is a double pipe heat exchanger,

the shell pass of the double-pipe heat exchanger is connected in the hot gas bypass pipeline; and the tube side of the double-tube heat exchanger is connected with the circulating loop.

5. The air conditioner of claim 1, further comprising a second electronic expansion valve,

the second electronic expansion valve is arranged on the hot gas bypass pipeline and is positioned on the downstream side of the bypass heat exchanger.

6. The air conditioner according to claim 1, further comprising:

and the mixer is arranged between the outer machine heat exchanger and the compressor and used for mixing the refrigerant in the bypass heat exchanger and the refrigerant subjected to heat exchange by the outer machine heat exchanger on the front side of the compressor.

7. The air conditioner according to claim 6, further comprising:

and the temperature detection device is used for detecting the temperature of the outer machine heat exchanger and/or the temperature of the front side of the inlet of the compressor.

8. A control method of an air conditioner, characterized in that the control method is used for controlling the air conditioner of any one of claims 1 to 7,

the control method comprises the following steps:

when the air conditioner enters an external machine defrosting mode, the refrigerant before entering the external machine heat exchanger is subjected to temperature rise treatment by utilizing partial exhaust of the compressor.

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

detecting the temperature of the heat exchanger of the external unit when the defrosting mode of the external unit is executed;

and adjusting the heat exchange process of part of exhaust gas of the compressor and the refrigerant before entering the outer machine heat exchanger according to the temperature of the outer machine heat exchanger so as to enable the temperature of the refrigerant flowing into the outer machine heat exchanger to be higher than 0 ℃.

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

detecting a temperature of a front side of an inlet of a compressor while the external defrosting mode is performed;

and controlling the refrigerant flowing out of the hot gas bypass pipeline to be mixed with the refrigerant flowing out of the outer machine heat exchanger according to the temperature of the front side of the inlet of the compressor, so that the mixed refrigerant meets the preset suction superheat degree before flowing into the compressor.

Technical Field

The invention relates to the technical field of defrosting of air conditioners, in particular to an air conditioner and a control method thereof.

Background

At present, along with the development of economy, the living standard of people is improved, the demand on an air conditioner is continuously improved, the function of the air conditioner is also improved, only the refrigerating and heating functions can not meet the demands of customers, the traditional air conditioner frequently frosts when heating in winter, the temperature in a defrosting shutdown room is greatly reduced, and the comfort is poor.

Disclosure of Invention

In view of this, the invention discloses an air conditioner and a control method thereof, which are used for at least solving the problem that the user experience is reduced because the air conditioner needs to be shut down when defrosting.

In order to achieve the above object, the invention adopts the following technical scheme:

a first aspect of the present invention discloses an air conditioner, comprising:

the compressor, the inner machine heat exchanger, the first electronic expansion valve and the outer machine heat exchanger are sequentially connected to form a circulation loop;

the hot gas bypass pipeline is connected in the circulation loop and is connected with the outer machine heat exchanger in parallel;

Further optionally, a first end of the hot gas bypass pipeline is connected to the circulation loop and located between the inner heat exchanger and the first electronic expansion valve, and a second end of the hot gas bypass pipeline is connected to the circulation loop and located between the compressor and the outer heat exchanger.

Further optionally, a first end of the hot gas bypass pipeline is connected to the circulation loop and located between the outlet of the compressor and the inner heat exchanger, and a second end of the hot gas bypass pipeline is connected to the circulation loop and located between the compressor and the outer heat exchanger.

Further optionally, the bypass heat exchanger is a double pipe heat exchanger,

the shell pass of the double-pipe heat exchanger is connected in the hot gas bypass pipeline; and the tube side of the double-tube heat exchanger is connected with the circulating loop.

Further optionally, the air conditioner further comprises a second electronic expansion valve,

the second electronic expansion valve is arranged on the hot gas bypass pipeline and is positioned on the downstream side of the bypass heat exchanger.

Further optionally, the air conditioner further includes:

and the temperature detection device is used for detecting the temperature of the outer machine heat exchanger and/or the temperature of the front side of the inlet of the compressor.

In a second aspect of the present invention, there is disclosed a control method of an air conditioner for controlling the air conditioner as set forth in any one of the above,

the control method comprises the following steps:

Further optionally, the control method further includes:

detecting the temperature of the heat exchanger of the external unit when the defrosting mode of the external unit is executed;

Further optionally, the control method further includes:

detecting a temperature of a front side of an inlet of a compressor while the external defrosting mode is performed;

Has the advantages that: according to the invention, the hot gas bypass is added in the exhaust of the compressor, so that the defrosting mode is realized without shutdown, the indoor unit continuously supplies heat, the human body comfort is effectively improved, and the problems that the shutdown is required when the traditional air conditioner heats and defrosts, and the indoor unit blows cold air, the indoor environment temperature is reduced, and the human body comfort is seriously influenced are solved.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

FIG. 1 illustrates a schematic diagram of an air conditioner system according to an embodiment;

fig. 2 shows a configuration of a double pipe heat exchanger according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

The existing air conditioner needs to stop the indoor unit when defrosting, and the indoor temperature can be quickly reduced by the operation, so that the user experience is influenced. According to the invention, the hot gas bypass pipeline is added on the exhaust pipeline of the compressor, the external throttling device is arranged to realize defrosting operation of the outdoor unit, the indoor unit can be ensured not to stop, and the user experience is improved.

To further illustrate the technical solution of the present invention, the following specific examples are provided as shown in fig. 1-2.

Example 1

As shown in fig. 1, there is provided in the present embodiment an air conditioner including:

the compressor 1, the inner machine heat exchanger 2, the first electronic expansion valve 3 and the outer machine heat exchanger 5 are connected in sequence to form a circulation loop;

the hot gas bypass pipeline is connected in the circulating loop and is arranged in parallel with the external machine heat exchanger;

and the bypass heat exchanger 4 is used for exchanging heat for the refrigerant throttled by the first electronic expansion valve 3 by using the refrigerant shunted by the hot gas bypass pipeline.

The air conditioner in the embodiment is an air conditioner capable of defrosting without stopping the machine, is improved on the basis of a heat exchange system for reversing defrosting of an original four-way valve, and is characterized in that a hot gas bypass is added on an exhaust path of a compressor, and hot gas discharged by the bypass exchanges heat with a refrigerant throttled by a first electronic expansion valve 3 in a sleeve mode, so that the temperature of the hot gas entering an outer machine heat exchanger 5 is increased, and the purpose of defrosting of an outer machine is achieved. This change white mode need not to shut down, and the indoor set lasts the heat supply, effectively improves human travelling comfort, need shut down when solving traditional air conditioner heating and changing white, and the indoor set blows cold wind, leads to indoor ambient temperature to descend, seriously influences human travelling comfort problem.

In some optional ways, for the design of the hot gas bypass line, a first end of the hot gas bypass line may be disposed in the circulation loop between the inner heat exchanger 2 and the first electronic expansion valve 3, and a second end of the hot gas bypass line may be disposed in the circulation loop between the compressor 1 and the outer heat exchanger 5.

Or the first end of the hot gas bypass pipeline is connected in the circulation loop and positioned between the outlet of the compressor 1 and the inner machine heat exchanger 2, and the second end of the hot gas bypass pipeline is connected in the circulation loop and positioned between the compressor 1 and the outer machine heat exchanger 5.

The two connection modes can realize warming treatment of the refrigerant flowing through the outer machine heat exchanger, so that condensed frost on the outer machine heat exchanger is dissolved, the defrosting operation is completed under the condition that the inner machine does not shut down, the heating requirement of a user is guaranteed, and the user experience degree is improved.

In some alternatives, the bypass heat exchanger 4 is a double pipe heat exchanger. Correspondingly, the shell side of the double-pipe heat exchanger is connected in a hot gas bypass pipeline; the tube side of the double-pipe heat exchanger is connected with the circulation loop. Therefore, the two branches separated from the exhaust side of the compressor are adjusted and controlled, the temperature of the refrigerant in the other branch is raised by the refrigerant in the hot gas bypass pipeline and then the refrigerant is sent into the external machine heat exchanger 5, and frost condensed on the external machine heat exchanger 5 is treated. The refrigerant defrosted by the external heat exchanger 5 is mixed with the refrigerant in the hot gas bypass pipeline and finally flows back to the compressor 1.

In some optional ways, the air conditioner further comprises a second electronic expansion valve 6, wherein the second electronic expansion valve 6 is arranged on the hot gas bypass pipeline and is positioned at the downstream side of the bypass heat exchanger; the mixer 7 is arranged between the outer machine heat exchanger 5 and the compressor 1 and is used for mixing the refrigerant in the bypass heat exchanger and the refrigerant subjected to heat exchange by the outer machine heat exchanger 5 on the front side of the compressor 1; and the temperature detection device is used for detecting the temperature of the outer machine heat exchanger and/or the temperature of the front side of the inlet of the compressor.

In order to ensure that the test temperature of the second pipe temperature sensing bulb 9 is greater than 0 ℃, the opening degree of the first electronic expansion valve is controlled by detecting the exhaust temperature T (ensuring the heating capacity) entering the outer machine heat exchanger, such as: at the moment, the opening aB of the first electronic expansion valve which meets the requirement can be finally operated through fuzzy control and PID control; similarly, based on the determination that the detected temperature of the first tube temperature sensing bulb meets the suction superheat degree of 3-5 ℃, corresponding control logic is set, so that the second electronic expansion valve is controlled to ensure that the test temperature of the second tube temperature sensing bulb 9 is greater than 0 ℃ under the condition that the heat exchange is met, for example: the opening bB of the electronic expansion valve which meets the requirement can be finally operated through fuzzy control and PID control.

Example 2

In the present embodiment, there is provided a control method of an air conditioner for controlling the air conditioner of any one of embodiments 1. The control method comprises the following steps:

when the air conditioner enters an external machine defrosting mode, the temperature of the refrigerant before entering the external machine heat exchanger 5 is raised by utilizing partial exhaust gas of the compressor.

In some alternatives, while performing the outer machine defrosting mode, detecting an outer machine heat exchanger temperature; and adjusting the heat exchange process of partial exhaust of the compressor and the refrigerant before entering the outer machine heat exchanger according to the temperature of the outer machine heat exchanger so as to enable the temperature of the refrigerant flowing into the outer machine heat exchanger to be higher than 0 ℃.

In some optional manners, the control method further includes: detecting a temperature of a front side of an inlet of a compressor when an external defrosting mode is performed; and controlling the refrigerant flowing out of the hot gas bypass pipeline to be mixed with the refrigerant flowing out of the outer machine heat exchanger according to the temperature on the front side of the inlet of the compressor, so that the mixed refrigerant meets the preset suction superheat degree before flowing into the compressor.

The following describes the control method in this embodiment with reference to a specific structure of an air conditioner in the embodiment.

As shown in fig. 1, the air conditioner includes: the system comprises a compressor 1, an internal machine heat exchanger 2, a first electronic expansion valve 3, a double-pipe heat exchanger 4, an external machine heat exchanger 5, a second electronic expansion valve 6, a mixer 7, a first pipe temperature sensing bag 8 and a second pipe temperature sensing bag 9. Specifically, the operation of a compressor 1 for heating is implemented, a refrigerant is compressed by the compressor to generate high-temperature high-pressure gas, the high-temperature high-pressure gas enters an inner machine heat exchanger for heat exchange so as to heat the indoor, the high-temperature high-pressure liquid refrigerant after heat exchange is divided into two paths, the first path is throttled by a first electronic expansion valve 3 to become low-pressure low-temperature liquid, the low-pressure low-temperature liquid enters a sleeve type heat exchanger 4 to exchange heat with a second path (a hot gas bypass pipeline), the heat absorbed by the second path is changed into the refrigerant with the temperature of more than 0 ℃, the refrigerant enters an outer machine heat exchanger for heat exchange and then is gathered into a mixer to be mixed with the refrigerant throttled by a second path of electronic expansion valve 2, wherein the pipe temperature of the outer machine heat exchanger is detected by a second pipe temperature sensing bag 9, the pipe temperature of the mixer 7 is detected by a first pipe temperature sensing bag 8, the opening degree of an expansion valve is controlled so that the refrigerant in the mixer meets the suction superheat degree of 3-5 ℃, and the refrigerant entering the compressor 1 can be in a gaseous state when the refrigerant is overheated degree of 3-5 ℃, liquid refrigerant entering the compressor 1 can generate liquid impact, the compressor 1 can be damaged due to long-time liquid impact, and the reliability of the compressor 1 cannot be ensured; the second path of high-temperature and high-pressure liquid enters the sleeve type heat exchanger 4 to exchange heat with the low-temperature and low-pressure liquid refrigerant throttled by the first path of electronic expansion valve 3 in the sleeve, and the low-temperature and high-pressure liquid after heat exchange is throttled by the second electronic expansion valve 6 to be low-temperature and low-pressure liquid to be mixed with low-temperature and low-pressure gas output by the outer machine heat exchanger 5.

As shown in fig. 2, when the bypass heat exchanger is a double-pipe heat exchanger, the bypass heat exchanger is made of a copper pipe, and is connected to the circulation loop through an inlet 10 of a pipe side and an outlet 12 of the pipe side, and is connected to the hot gas bypass pipeline through an inlet 11 of a shell side and an outlet 13 of the shell side, and the heat exchange is fully performed through the surface convection heat exchange of the sleeve pipe in the pipe side.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

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