CN106802008B

CN106802008B - Air conditioner

Info

Publication number: CN106802008B
Application number: CN201710028796.5A
Authority: CN
Inventors: 刘景升; 张中晓; 杨坤; 董德智; 郭翠彦; 陈晓伟; 刘晓蕾
Original assignee: Qingdao Haier Air Conditioning Electric Co Ltd
Current assignee: Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2017-01-16
Filing date: 2017-01-16
Publication date: 2020-01-17
Anticipated expiration: 2037-01-16
Also published as: CN106802008A

Abstract

The invention discloses an air conditioner, which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and a throttling unit arranged between the indoor heat exchanger and the outdoor heat exchanger, wherein the throttling unit is provided with a first throttling state for refrigeration, a second throttling state for heating and a third throttling state for defrosting, and the throttling amount of the throttling unit in the first throttling state is smaller than that in the third throttling state. In the invention, the throttling quantity of the throttling unit in the first throttling state is less than that in the third throttling state, so that the throttling capacity of the air conditioner is higher under the heating defrosting condition, and the temperature of the refrigerant returning to the outdoor heat exchanger is higher, so that more heat can be released at the outdoor heat exchanger, the evaporation of a frost layer on the surface of the outdoor heat exchanger is accelerated, and the defrosting effect of the air conditioner is improved.

Description

Air conditioner

Technical Field

The invention relates to the technical field of air conditioning, in particular to an air conditioner.

Background

When the heat pump air conditioning system heats, when the outdoor environment temperature is lower than the freezing point, water vapor in the air can be condensed on the surface of the heat exchanger, a frost layer can be formed on the surface of the heat exchanger along with the change of time, and the frost directly increases the heat transfer resistance between the surface of the heat exchanger and flowing air, so that the air flow flux passing through the heat exchanger is reduced, the heat exchange efficiency is reduced, the heat exchange quantity of the system is reduced, the heating working condition of the system is worsened, and measures are required to be taken for defrosting.

Existing air conditioners generally include cooling and heating cycles, and a defrost cycle during heating that is enabled when a heat exchanger of the air conditioner needs to be defrosted. Because the outdoor throttling device is determined according to the rated refrigeration or the rated heating of the air conditioner in the design test process of the refrigerant, the throttling can meet the design requirement of the system under the working condition of the rated refrigeration or the rated heating. In the defrosting stage, because the air conditioner operates and refrigerates under the heating condition, the throttling capacity of the throttling device outside the system is not matched with the throttling capacity required during defrosting, and the effect of the system in the refrigerating and defrosting stage is poor.

Disclosure of Invention

The invention aims to provide an air conditioner, which can match the throttling capacity of an outdoor throttling device of the air conditioner under a defrosting working condition with the throttling capacity required during defrosting, and improve the defrosting effect.

According to an aspect of the present invention, there is provided an air conditioner including a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, and a throttle unit disposed between the indoor heat exchanger and the outdoor heat exchanger, the throttle unit having a first throttle state for cooling, a second throttle state for heating, and a third throttle state for defrosting, a throttle amount of the throttle unit in the first throttle state being smaller than a throttle amount in the third throttle state.

In the invention, the throttling unit of the air conditioner has three throttling states, namely a first throttling state for refrigeration, a second throttling state for heating and a third throttling state for defrosting, and the throttling amount of the throttling unit in the first throttling state is smaller than that in the third throttling state, so that the throttling capacity of the air conditioner is higher under the defrosting condition, the temperature of a refrigerant returning to the outdoor heat exchanger is higher, more heat can be released at the outdoor heat exchanger, the evaporation of a frost layer on the surface of the outdoor heat exchanger is accelerated, and the defrosting effect of the air conditioner is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

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

Fig. 1 is a structural view of an air conditioner according to an embodiment of the present invention;

FIG. 2 is a block diagram of a throttling unit of an embodiment of the present invention;

fig. 3 is a structural diagram of a throttle unit of the embodiment of the present invention.

Description of reference numerals: 10. a compressor; 20. an indoor heat exchanger; 30. an outdoor heat exchanger; 40. a four-way valve; 50. a throttling unit; 51. a first control valve; 52. a first throttling device; 53. a first check valve; 54. a second throttling device; 55. a second control valve; 56. and a third throttling device.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.

Referring to fig. 1 in combination, an embodiment of the present invention discloses an air conditioner including a compressor 10, an indoor heat exchanger 20, an outdoor heat exchanger 30, a four-way valve 40, and a throttling unit 50 disposed between the indoor heat exchanger 20 and the outdoor heat exchanger 30, the throttling unit 50 having a first throttling state for cooling, a second throttling state for heating, and a third throttling state for defrosting, a throttling amount of the throttling unit 50 in the first throttling state being smaller than a throttling amount in the third throttling state.

In the invention, the throttling unit 50 of the air conditioner has three throttling states, namely a first throttling state for refrigeration, a second throttling state for heating and a third throttling state for defrosting, and the throttling amount of the throttling unit in the first throttling state is smaller than that in the third throttling state, so that the throttling capacity of the air conditioner is higher under the defrosting condition, and the temperature of the refrigerant flowing to the outdoor heat exchanger is higher, therefore, the refrigerant can release more heat at the outdoor heat exchanger, the evaporation of a frost layer on the surface of the outdoor heat exchanger is accelerated, and the defrosting effect of the air conditioner is improved.

Optionally, in the above embodiment, there are multiple implementation manners for setting the first throttling state, the second throttling state and the third throttling state, as an optional embodiment, as shown in fig. 1 and fig. 2, the throttling unit 50 includes a main throttling path, a first throttling finger path and a second throttling branch path, the main throttling path includes a first control valve 51 and a first throttling device 52 connected in series, the first throttling branch path is connected in parallel with the first control valve 51, the second throttling branch path is connected in parallel with the main throttling path, when the throttling unit 50 is in the first throttling state, the main throttling path is turned on, the second throttling branch path is turned off, the first throttling branch path is turned on, when the throttling unit 50 is in the second throttling state, the main throttling path is turned off, the second throttling branch path is turned off, and the first throttling branch path is turned on; when the throttling unit 50 is in the third throttling state, the main throttling path is disconnected, the first throttling branch is connected, and the second throttling branch is connected.

In this embodiment, when the throttling unit is in the first throttling state, that is, the air conditioner is used for cooling, the throttling amount required by the air conditioner is small, the main throttling path is on, the second throttling branch is off, and the first throttling branch is on, because the first throttling branch is connected in parallel with the first control valve 51, the refrigerant mainly passes through the main throttling path with a small throttling amount, and in this embodiment, as shown in fig. 1, the flow direction of the air conditioning refrigerant is: 10-2-3-30-50-6-20-8-3-9-10, wherein the refrigerant in the throttling unit 50 passes through the throttling main path. When the throttling unit is in the second throttling state, that is, the air conditioner is used for heating, the amount of heat exchange required in the room is large, the main throttling path is disconnected, the main throttling path can be disconnected by using the closing control valve 51, and at this time, the refrigerant passes through the first throttling device 52 and the first throttling branch, as shown in fig. 1, the flow direction of the refrigerant is: 10-2-3-8-20-6-50-30-3-9-10, wherein the refrigerant flows from the first throttling device 52 to the first throttling branch in the throttling unit 50, and the refrigerant is more fully vaporized through the twice throttling actions of the first throttling device 52 and the first throttling branch, and can absorb more heat to heat the indoor space. When the throttling unit 50 is in the third throttling state, that is, the air conditioner is used for defrosting, the throttling amount required by the air conditioner is large, the throttling main path is disconnected, the first throttling branch is connected, the second throttling branch is connected, the refrigerant mainly passes through the second throttling branch with large throttling amount, in this embodiment, the flowing direction of the refrigerant is as follows: 10-2-3-30-50-6-20-8-3-9-10, wherein the refrigerant passes through the second throttling branch and the first throttling branch in the throttling unit 50, and the throttling capacity of the air conditioner is higher and is matched with the throttling capacity required during defrosting.

As another alternative embodiment, as shown in fig. 3, the throttling unit 50 includes a main throttling path, a first throttling branch and a second throttling branch, the main throttling path includes a first control valve 51, a first one-way valve 53 and a first throttling device 52 connected in series, the first throttling branch is connected in parallel with the first one-way valve 53, the second throttling branch is connected in parallel with the main throttling path, the first throttling branch includes a second throttling device 54, and the second throttling branch includes a second control valve 55 and a third throttling device 56 connected in series.

In the present embodiment, when the throttling unit 50 is in the first throttling state, that is, when the air conditioner is used for cooling, the throttling amount required by the air conditioner is small, and the first control valve 51 and the first check valve 53 are opened, and the second control valve 55 is closed, since the first check valve 53 is connected in parallel with the first throttling branch, the refrigerant mainly passes through the main throttling path with the small throttling amount, and in the present embodiment, as shown in fig. 1, the flow direction of the air conditioning refrigerant is: 10-2-3-30-50-6-20-8-3-9-10, wherein the refrigerant in the throttling unit 50 passes through the throttling main path. When the throttle unit 50 is in the second throttle state, that is, when the air conditioner is used for heating, the amount of heat exchange required in the room is large, the first check valve 53 and the second control valve 55 are closed, the first control valve 51 is opened, and the refrigerant passes through the first throttle device 52 and the second throttle device 54, in this embodiment, as shown in fig. 1, the flow direction of the refrigerant is: 10-2-3-8-20-6-50-30-3-9-10, wherein the refrigerant flows from the first throttling device 52 to the second throttling device 54 in the throttling unit 50, and at this time, the refrigerant can be more fully vaporized through the first throttling device 53 and the second throttling device 54, so as to absorb more heat for heating the room. When the throttling unit 50 is in the third throttling state, that is, the air conditioner is used for defrosting, the throttling amount required by the air conditioner is large, the first control valve 51 is closed, and the second control valve 55 is opened, so that the refrigerant passes through the second throttling branch with the large throttling amount, in this embodiment, the flowing direction of the refrigerant is: 10-2-3-30-50-6-20-8-3-9-10, wherein the refrigerant passes through the second throttling branch and the first throttling branch in the throttling unit 50, and the throttling capacity of the air conditioner is higher and is matched with the throttling capacity required during defrosting.

In the above embodiment, the first control valve 51 may be a solenoid valve as shown in fig. 2. Optionally, a first check valve 53 is disposed between the electromagnetic valve and the first throttling device 52, the first check valve 53 is in one-way communication with the first throttling device 52 from the outdoor heat exchanger 30, and the electromagnetic valve is connected in series with the first check valve 53 and then connected in parallel with the first throttling branch.

In the embodiment, since the first check valve 53 is in one-way conduction from the outdoor heat exchanger 30 to the first throttling device 52, when the throttling unit 50 is in the first throttling state, that is, the air conditioner is used for cooling, the refrigerant can flow from the outdoor heat exchanger 30 to the first throttling device 52, and when the throttling unit 50 is in the second throttling state, that is, the air conditioner is used for heating, the refrigerant cannot directly flow from the first throttling device 52 to the outdoor heat exchanger 30, but flows from the first throttling device 52 to the outdoor heat exchanger through the first throttling branch, and the refrigerant can be sufficiently vaporized, so that more heat can be absorbed, and the indoor heating requirement can be met.

Optionally, the first throttle branch comprises a second throttle device 54 for throttling purposes of the first throttle branch.

Optionally, the second throttle branch comprises a second control valve 55 and a third throttling device 56 in series. Wherein the second control valve 55 is used for controlling the opening and closing of the second throttling branch and the third throttling means 56 is used for realizing the throttling function of the second throttling branch.

Optionally, in any of the above embodiments, the first throttling means 52, the second throttling means 54 and the third throttling means 56 are capillary tubes. In the present invention, the first, second and

third throttling devices

52, 54 and 56 may be other throttling devices, such as electronic expansion valves, etc., but are not limited thereto as long as the purpose of throttling can be achieved.

Optionally, the second control valve 55 is a solenoid valve, and the on and off of the second throttling branch can be controlled by a switch of the solenoid valve.

Optionally, the throttling amount of the first throttling device 52 is smaller than that of the third throttling device 56, so that the requirements of the air conditioner on the throttling capacity under different working conditions can be met.

It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. An air conditioner is characterized by comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and a throttling unit arranged between the indoor heat exchanger and the outdoor heat exchanger, wherein the throttling unit is provided with a first throttling state for refrigeration, a second throttling state for heating and a third throttling state for defrosting, and the throttling amount of the throttling unit in the first throttling state is smaller than that in the third throttling state.

2. The air conditioner according to claim 1, wherein the throttling unit comprises a main throttling path, a first throttling branch path and a second throttling branch path, the main throttling path comprises a first control valve and a first throttling device which are connected in series, the first throttling branch path is connected with the first control valve in parallel, the second throttling branch path is connected with the main throttling path in parallel, when the throttling unit is in a first throttling state, the main throttling path is conducted, the second throttling branch path is disconnected, and the first throttling branch path is conducted; when the throttling unit is in a second throttling state, the throttling main circuit is disconnected, the second throttling branch circuit is disconnected, and the first throttling branch circuit is connected; when the throttling unit is in a third throttling state, the throttling main circuit is disconnected, the first throttling branch circuit is connected, and the second throttling branch circuit is connected.

3. The air conditioner according to claim 1, wherein the throttling unit comprises a main throttling path, a first throttling branch path and a second throttling branch path, the main throttling path comprises a first control valve, a first check valve and a first throttling device which are connected in series, the first throttling branch path is connected in parallel with the first check valve, the second throttling branch path is connected in parallel with the main throttling path, the first throttling branch path comprises a second throttling device, and the second throttling branch path comprises a second control valve and a third throttling device which are connected in series.

4. An air conditioner according to claim 2 or 3, wherein said first control valve is a solenoid valve.

5. The air conditioner as claimed in claim 2, wherein a first check valve is further disposed between the first control valve and the first throttling device, the first check valve is in one-way communication from the outdoor heat exchanger to the first throttling device, and the first control valve is connected in series with the first check valve and then connected in parallel with the first throttling branch.

6. The air conditioner according to claim 4, wherein the first, second and third throttling means are capillary tubes.

7. The air conditioner according to claim 4, wherein the second control valve is a solenoid valve.

8. The air conditioner according to claim 6, wherein a throttle amount of the first throttling means is smaller than a throttle amount of the third throttling means.