CN115540397A

CN115540397A - Heat exchanger and air conditioner

Info

Publication number: CN115540397A
Application number: CN202211000859.3A
Authority: CN
Inventors: 滕兆龙; 代传民; 孙萍; 魏伟; 张心怡
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Smart Technology R&D Co Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Smart Technology R&D Co Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-12-30
Anticipated expiration: 2042-08-19
Also published as: CN115540397B

Abstract

The application relates to the technical field of air conditioners, and discloses a heat exchanger, including: the heat exchange pipeline comprises a condensation section; the liquid storage tank is arranged at the condensation section and is provided with a first inlet and outlet pipe and a second inlet and outlet pipe; the first end of the first inlet and outlet pipe is communicated with the liquid storage tank, and the second end of the first inlet and outlet pipe is communicated with one part of the condensation section; the first end of the second inlet and outlet pipe is communicated with the liquid storage tank, and the second end of the second inlet and outlet pipe is communicated with the other part of the condensation section; the distance from the first end of the first inlet and outlet pipe to the bottom of the liquid storage tank is smaller than the distance from the first end of the second inlet and outlet pipe to the bottom of the liquid storage tank; and the heating device is arranged on the outer wall of the liquid storage tank and used for heating the refrigerant in the liquid storage tank. The refrigerant flow of the refrigerant circulation loop is self-adaptively adjusted through the liquid storage tank under different working conditions, the structure is simple, the cost is low, control is not needed, and the system reliability is high. The application also discloses an air conditioner.

Description

Heat exchanger and air conditioner

Technical Field

The application relates to the technical field of air conditioners, for example to a heat exchanger and an air conditioner.

Background

At present, an air conditioner, as a very common electric appliance, can operate in a cooling or heating mode to adjust the indoor temperature of a user, and is widely applied to various living or working environments such as homes, offices, markets and the like. The optimal refrigerant amount required by the air conditioner is different when the air conditioner operates under different operating environment temperatures and different loads. For example, when an air conditioner refrigerates, the heat exchange coefficient of the condenser is large, and the content of the liquid refrigerant in the condenser is increased. However, at this time, the refrigerant flow rate required by the evaporator is small, that is, the actual refrigerant flow rate is larger than the refrigerant flow rate required by the system, thereby causing energy efficiency loss of the system.

In the related art, a refrigerant storage device is generally arranged between an indoor heat exchanger and an outdoor heat exchanger, and electromagnetic valves and capillary tubes are arranged at two ends of the refrigerant storage device to control the flow of the refrigerant, so that the refrigerant storage device plays a role in storing the refrigerant.

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

because the solenoid valve and the capillary tube are needed to be arranged at the two ends of the refrigerant storage device to control the refrigerant flow, the pipeline cost is high, the control is complex, and the system reliability is poor. Moreover, the temperature of the refrigerant storage device cannot be adjusted.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a heat exchanger and an air conditioner, and solves the problems of high pipeline cost, complex control, poor system reliability and incapability of adjusting temperature of a refrigerant storage device.

In some embodiments, the heat exchanger comprises:

the heat exchange pipeline comprises a condensation section;

the liquid storage tank is arranged at the condensation section and is provided with a first inlet and outlet pipe and a second inlet and outlet pipe; the first end of the first inlet and outlet pipe is communicated with the liquid storage tank, and the second end of the first inlet and outlet pipe is communicated with one part of the condensation section; the first end of the second inlet and outlet pipe is communicated with the liquid storage tank, and the second end of the second inlet and outlet pipe is communicated with the other part of the condensation section; the distance from the first end of the first inlet and outlet pipe to the bottom of the liquid storage tank is smaller than the distance from the first end of the second inlet and outlet pipe to the bottom of the liquid storage tank;

and the heating device is arranged on the outer wall of the liquid storage tank and used for heating the refrigerant in the liquid storage tank.

Optionally, the heating device comprises:

optionally, the heating coil is located at the middle lower part of the side surface of the liquid storage tank.

Optionally, the power of the heating coil is adjustable.

Optionally, the heat exchanger further comprises:

the fins surround the side face of the tank body of the liquid storage tank and are uniformly arranged along the axis of the liquid storage tank;

the heating coil is disposed between adjacent fins.

Alternatively, the number of turns of the heating coil between adjacent ones of the fins is the same.

In some embodiments, the air conditioner includes the heat exchanger of any of the above embodiments.

Optionally, the heat exchanger is used as an outdoor unit of the air conditioner.

Optionally, when the air conditioner operates in a refrigeration mode, a refrigerant flows into the liquid storage tank from the first inlet and outlet pipe, and flows out of the liquid storage tank from the second inlet and outlet pipe.

Optionally, when the air conditioner operates in the heating mode, the refrigerant flows into the liquid storage tank from the second inlet/outlet pipe, and flows out of the liquid storage tank from the first inlet/outlet pipe.

The heat exchanger and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

when the heat exchanger is used as a condenser, the refrigerant enters the liquid storage tank from the first inlet and outlet pipe and flows out of the liquid storage tank from the second inlet and outlet pipe. Because the first end of the first inlet and outlet pipe and the first end of the second inlet and outlet pipe have a height difference, the volume of the liquid storage tank corresponding to the height difference can store the refrigerant, and therefore the refrigerant flow of the system is reduced. In addition, when the heat exchanger is used as an evaporator, the refrigerant enters the liquid storage tank from the second inlet and outlet pipe and flows out of the liquid storage tank from the first inlet and outlet pipe. At the moment, the refrigerant in the liquid storage tank is less, and most of the refrigerant is discharged through the first inlet and outlet pipe, so that the refrigerant flow of the system is increased. Therefore, the refrigerant flow of the refrigerant circulation loop is self-adaptively adjusted through the liquid storage tank under different working conditions, the structure is simple, the cost is low, control is not needed, and the system reliability is high.

And heat can be transferred to the refrigerant in the liquid storage tank through the heating device. When the heat exchanger is used as an evaporator, the heating device supplies heat to the liquid storage tank so as to improve the temperature of the refrigerant, so that the liquid refrigerant in the liquid storage tank is gasified to participate in refrigerant circulation, and the heating capacity of the air conditioner is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic structural diagram of a heat exchanger provided by an embodiment of the present disclosure;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of a semiconductor refrigeration device provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural view of a heating coil provided in the embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a phase change heat storage material provided by an embodiment of the disclosure;

fig. 6 is a schematic structural diagram of a fin provided in an embodiment of the present disclosure.

Reference numerals:

100: a liquid storage tank; 101: a first inlet pipe and a first outlet pipe; 102: a second inlet and outlet pipe; 110: a semiconductor refrigeration device; 120: a heating coil; 130: a fin; 140: a phase change heat storage material;

200: a heat exchanger; 201: a first heat exchange path; 202: a second heat exchange path; 210: a first main pipeline; 211: a second main pipeline; 220: a first shunt element; 221: a second flow dividing element.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides orientation or position, for example, the term "on" may also be used to indicate some kind of attachment or connection in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

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

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1-6, an embodiment of the present disclosure provides a heat exchanger 200, which includes a heat exchange pipeline, a liquid storage tank 100, and a heating device. Wherein, the heat exchange pipeline comprises a condensing section and a supercooling section which are communicated with each other; the liquid storage tank 100 is arranged at the condensation section, and the liquid storage tank 100 is provided with a first inlet and outlet pipe 101 and a second inlet and outlet pipe 102; wherein, the first end of the first inlet and outlet pipe 101 is communicated with the liquid storage tank 100, and the second end is communicated with a part of the condensation section; a first end of the second inlet and outlet pipe 102 is communicated with the liquid storage tank 100, and a second end thereof is communicated with the other part of the condensation section; moreover, the distance from the first end of the first inlet and outlet pipe 101 to the bottom of the liquid storage tank 100 is less than the distance from the first end of the second inlet and outlet pipe 102 to the bottom of the liquid storage tank 100. The heating device is disposed on an outer wall of the liquid storage tank 100 for heating the refrigerant in the liquid storage tank 100.

With the heat exchanger 200 provided in the embodiment of the present disclosure, when the heat exchanger 200 is used as a condenser, the refrigerant enters the liquid storage tank 100 through the first inlet/outlet pipe 101 and flows out of the liquid storage tank 100 through the second inlet/outlet pipe 102. Because the first end of the first inlet and outlet pipe 101 and the first end of the second inlet and outlet pipe 102 have a height difference, the volume of the liquid storage tank 100 corresponding to the height difference can store the refrigerant, thereby reducing the refrigerant flow of the system. In addition, when the heat exchanger 200 is used as an evaporator, the refrigerant enters the accumulator 100 through the second inlet/outlet pipe 102 and flows out of the accumulator 100 through the first inlet/outlet pipe 101. At this time, the refrigerant in the liquid storage tank 100 is less, and most of the refrigerant is discharged through the first inlet and outlet pipe 101, thereby increasing the refrigerant flow rate of the system. Therefore, the refrigerant flow of the refrigerant circulation loop is self-adaptively adjusted through the liquid storage tank 100 under different working conditions, the structure is simple, the cost is low, the control is not needed, and the system reliability is high.

And, heat can be transferred to the refrigerant in the accumulator 100 by the heating device. When the heat exchanger 200 is used as an evaporator, heat is supplied to the liquid storage tank 100 through the heating device to increase the temperature of the refrigerant, so that the liquid refrigerant in the liquid storage tank 100 is gasified to participate in refrigerant circulation, thereby improving the heating capacity of the air conditioner.

Optionally, the first inlet and outlet pipes 101 are vertically arranged. Thus, the inflow and outflow of the refrigerant are facilitated, and the stroke of the refrigerant in the receiver 100 is reduced.

Alternatively, the second inlet and outlet pipes 102 are vertically arranged. Thus, inflow and outflow of the refrigerant are facilitated, and a stroke of the refrigerant in the accumulator 100 is reduced.

According to the phase state of the refrigerant flowing in the condensation section of the heat exchanger 200, the condensation section may be divided into a gas phase region, a liquid phase region, and a gas-liquid two-phase region, and the liquid storage tank 100 is disposed in the gas-liquid two-phase region.

Illustratively, the heat exchange pipeline is constructed into a vertical single-row structure, comprises twelve heat exchange pipes, and an eighth heat exchange pipe and a ninth heat exchange pipe counted from top to bottom are positioned in the gas-liquid two-phase region. The liquid storage tank 100 is communicated between the eighth heat exchange tube and the ninth heat exchange tube.

In the present embodiment, as shown in fig. 1 and 2, the heat exchange pipeline includes a first main pipeline 210, a second main pipeline 211, a first heat exchange passage 201 and a second heat exchange passage 202. Wherein a first end of first heat exchange passage 201 and a first end of second heat exchange passage 202 are communicated with first flow dividing element 220, and a second end of first heat exchange passage 201 and a second end of second heat exchange passage 202 are communicated with second flow dividing element 221; first shunt element 220 communicates with first main conduit 210, and second shunt element 221 communicates with second main conduit 211. Wherein, the first heat exchange passage 201 flows through the first, second, eighth to tenth heat exchange tubes counted from top to bottom, the second heat exchange passage 202 flows through the third to seventh heat exchange tubes counted from top to bottom, and the second main pipeline 211 flows through the eleventh and twelfth heat exchange tubes counted from top to bottom. The liquid storage tank 100 is arranged on the first heat exchange passage 201, and the second end of the first inlet and outlet pipe 101 is communicated with the eighth heat exchange pipe counted from top to bottom; the second end of the second inlet and outlet pipe 102 is communicated with the ninth heat exchange pipe counted from top to bottom.

Alternatively, as shown in fig. 4, the heating means includes a heating coil 120. The heating coil 120 is disposed around the side of the fluid reservoir 100. When the heating coil 120 is energized, it generates heat, and then supplies heat to the refrigerant inside the liquid storage tank 100 through the sidewall of the liquid storage tank 100, so that the liquid refrigerant in the liquid storage tank 100 is gasified to participate in the refrigerant circulation, thereby improving the heating capability of the air conditioner.

Alternatively, the heating coil 120 is located at a middle lower portion of the side of the liquid storage tank 100. The liquid refrigerant stored in the liquid storage tank 100 is mainly located at the middle lower portion thereof, and the heating coil 120 is disposed at a position convenient for heating the refrigerant.

Alternatively, the power of the heating coil 120 may be adjusted. In this embodiment, the power of the heating coil 120 is adjusted to adjust the vaporization rate of the refrigerant in the liquid storage tank 100, so as to adjust the amount of the refrigerant participating in the circulation. For example, the power of the heating coil 120 is set to three, and the heating capacity of the air conditioner is improved by increasing the power of the heating coil 120 and further increasing the refrigerant flow rate by increasing the shift position of the heating coil 120 as the outside temperature decreases.

Optionally, the heat exchanger 200 further comprises a plurality of fins 130. The plurality of fins 130 surround the side of the fluid reservoir tank 100 and are uniformly arranged along the axis of the fluid reservoir tank 100; the heating coil 120 is disposed between adjacent fins 130.

In the present embodiment, the heat exchange capability of the liquid storage tank 100 is improved by providing the fins 130, so as to facilitate the improvement of the dryness of the refrigerant at the inlet of the evaporator when the heat exchanger 200 is used as a condenser. The heating coil 120 may be disposed to supply heat to the refrigerant in the liquid storage tank 100, so as to improve the flow rate of the refrigerant when the heat exchanger 200 is used as an evaporator.

Alternatively, the number of turns of the heating coil 120 between the adjacent fins 130 is the same. Thus, heat can be supplied to the refrigerant in the receiver 100 more uniformly, and the liquid refrigerant in the receiver 100 is gasified to participate in the refrigerant circulation.

Optionally, as shown in fig. 3, the heat exchanger 200 further comprises the semiconductor refrigeration device 110. The semiconductor refrigeration device 110 is disposed on an outer wall of the liquid storage tank 100 for adjusting a temperature of a refrigerant in the liquid storage tank 100.

In this embodiment, the semiconductor refrigeration device 110 can transmit cold or heat to the refrigerant in the accumulator 100. When the heat exchanger 200 is used as a condenser, the semiconductor refrigeration device 110 cools the refrigerant in the liquid storage tank 100 to reduce the temperature of the refrigerant, which is equivalent to supercooling the refrigerant, thereby reducing the length of a supercooling section and reducing the cost and size of the heat exchanger 200. In addition, by controlling the amount of cooling supplied from the semiconductor cooling device 110, the supercooling degree of the air conditioning system can be accurately controlled, thereby improving the cooling capacity of the air conditioner. When the heat exchanger 200 is used as an evaporator, the semiconductor refrigeration device 110 supplies heat to the liquid storage tank 100 to increase the temperature of the refrigerant, so that the liquid refrigerant in the liquid storage tank 100 is gasified to participate in refrigerant circulation, thereby improving the heating capacity of the air conditioner.

Optionally, the semiconductor cooling device 110 comprises a cooling fin. The refrigerating sheet is attached to an outer wall of the liquid storage tank 100 and used for supplying cold or heat to the refrigerant in the liquid storage tank 100.

In this embodiment, the cooling fins operate by using a dc current, and the polarity of the dc current is changed to determine whether to perform cooling or heating on the same cooling fin. The refrigerating sheet supplies cold or heat to the refrigerant inside the liquid storage tank 100 through the outer wall thereof.

Optionally, the semiconductor refrigeration device 110 further comprises a mount. The mounting seat is arranged on the outer wall of the liquid storage tank 100 and used for fixing the refrigeration sheet.

Optionally, the semiconductor refrigeration device 110 is disposed at the bottom of the outside of the liquid storage tank 100. In this embodiment, the refrigeration sheet is fixed to the bottom of the liquid storage tank 100 through the mounting seat, and the refrigeration sheet supplies cold or heat to the refrigerant inside the refrigeration sheet through the bottom wall of the liquid storage tank 100.

Alternatively, two semiconductor refrigeration devices 110 are oppositely disposed on the sidewalls of both sides of the liquid storage tank 100. In this embodiment, the refrigeration piece is fixed in the both sides and the height of liquid storage pot 100 through the mount pad and is the same, and the refrigeration piece of both sides is to the inside refrigerant simultaneous cooling or heat supply of liquid storage pot 100 like this, and the temperature variation of refrigerant is more even.

Optionally, the plurality of semiconductor refrigeration devices 110 are uniformly disposed on the sidewall of the liquid storage tank 100 along the axis of the liquid storage tank 100. In the present embodiment, the plurality of cooling fins are uniformly arranged along the axis of the liquid storage tank 100, i.e. along the height direction of the liquid storage tank 100, so that the cooling or heating effect is ensured under the condition that the liquid level of the liquid storage tank 100 is high.

Optionally, the heat exchanger 200 further comprises a phase change thermal storage device. The phase change heat storage device is disposed on an outer wall of the liquid storage tank 100, and is configured to absorb heat of the refrigerant in the liquid storage tank 100 through phase change.

In this embodiment, when the heat exchanger 200 is used as a condenser, the phase change heat storage device absorbs heat of the refrigerant in the liquid storage tank 100 to reduce the temperature of the refrigerant, which is equivalent to supercooling the refrigerant, thereby reducing the length of the supercooling section and reducing the cost and size of the heat exchanger 200.

Alternatively, as shown in fig. 5, the phase change heat storage device includes a phase change heat storage material 140. The phase change heat storage material 140 is wrapped on the outer wall of the liquid storage tank 100, and the phase change heat storage material 140 absorbs heat of the refrigerant inside the liquid storage tank 100 through the outer wall of the liquid storage tank and stores the heat through phase change.

Optionally, a phase change thermal storage material 140 is wrapped around the sides and bottom of the fluid reservoir tank 100. Thus, the heat of the refrigerant inside the receiver 100 is absorbed.

Optionally, a phase change thermal storage material 140 is wrapped around the lower-middle portion of the sides of the fluid reservoir tank 100. The liquid refrigerant stored in the liquid tank 100 is mainly located at the lower portion thereof, and the phase change heat storage material 140 is disposed at a position to absorb heat of the refrigerant.

Optionally, the thickness of the phase change thermal storage material 140 wrapped around the side of the fluid reservoir 100 is greater than the thickness of the phase change thermal storage material 140 wrapped around the bottom of the fluid reservoir 100. The reservoir tank 100 has a cylindrical shape, and the area of the side surface is larger than the area of the bottom surface. Therefore, the phase change heat storage material 140 wrapped on the side of the liquid storage tank 100 has a larger thickness, which is beneficial to absorbing the heat of the refrigerant in the liquid storage tank 100.

Optionally, the phase change temperature of the phase change heat storage material 140 is 20 ℃ to 30 ℃. When the heat exchanger 200 is used as a condenser, the temperature of the refrigerant flowing through the liquid storage tank 100 is 35-40 ℃. At this time, the temperature of the refrigerant is higher than the phase change temperature of the phase change heat storage material 140, and the heat of the refrigerant is transferred to the phase change heat storage material 140 to cause phase change, thereby reducing the temperature of the refrigerant.

Optionally, the storage tank 100 further comprises a heat exchange device. The heat exchange device is disposed on an outer wall of the liquid storage tank 100, so as to facilitate heat exchange of the refrigerant inside the liquid storage tank 100.

In this embodiment, when the heat exchanger 200 is used as a condenser, the temperature of the refrigerant in the liquid storage tank 100 is reduced by heat exchange between the refrigerant and the external environment through the heat exchange device, which is equivalent to supercooling the refrigerant, thereby reducing the length of the supercooling section and reducing the cost and size of the heat exchanger 200. And, the refrigerant quality of the evaporator inlet is improved.

Optionally, as shown in fig. 6, the heat exchange means comprises fins 130. Fins 130 are disposed around the sides of the tank of the fluid reservoir tank 100. This is beneficial to the heat exchange between the refrigerant in the liquid storage tank 100 and the external environment, thereby reducing the temperature of the refrigerant.

Alternatively, the plurality of fins 130 are arranged along the axis of the fluid reservoir 100. In the present embodiment, the plurality of fins 130 are disposed along the axis of the liquid storage tank 100, i.e., along the height direction of the liquid storage tank 100, so that the heat exchange effect is ensured under the condition that the liquid level of the liquid storage tank 100 is high.

Optionally, the spacing of adjacent fins 130 is the same. This is beneficial to the uniform heat exchange between the refrigerant in the liquid storage tank 100 and the external environment.

Alternatively, the fins 130 are integrally formed with the fluid reservoir tank 100. This simplifies the connection between the fins 130 and the fluid reservoir tank 100.

Alternatively, the fins 130 are made of aluminum, copper, or an aluminum alloy. The aluminum, copper or aluminum alloy has excellent heat conductivity, and is beneficial to heat exchange between the refrigerant in the liquid storage tank 100 and the external environment.

Optionally, a temperature sensor is provided within the fluid reservoir tank 100. The temperature sensor is used for detecting the temperature of the refrigerant in the liquid storage tank 100. Thus, the temperature of the refrigerant in the liquid storage tank 100 can be monitored in real time through the temperature sensor.

Optionally, a pressure sensor is provided within the fluid reservoir tank 100. The pressure sensor is used for detecting the pressure of the refrigerant in the liquid storage tank 100. Thus, the pressure of the refrigerant in the liquid storage tank 100 can be monitored in real time by the pressure sensor.

The embodiment of the present disclosure further provides an air conditioner, which includes the heat exchanger 200 described in any of the above embodiments.

Alternatively, the heat exchanger 200 serves as an outdoor unit of an air conditioner.

In this embodiment, when the air conditioner operates in a cooling mode, i.e., the heat exchanger 200 serves as a condenser, the refrigerant flows into the liquid storage tank 100 through the first inlet/outlet pipe 101, and flows out of the liquid storage tank 100 through the second inlet/outlet pipe 102. Since a height difference exists between the first end of the first inlet/outlet pipe 101 and the first end of the second inlet/outlet pipe 102, a volume of the accumulator tank 100 corresponding to the height difference may store the refrigerant, thereby reducing a refrigerant flow rate. When the air conditioner operates in a heating mode, i.e., the heat exchanger 200 serves as an evaporator, the refrigerant flows into the reservoir tank 100 through the second inlet/outlet pipe 102 and flows out of the reservoir tank 100 through the first inlet/outlet pipe 101. At this time, the refrigerant in the liquid storage tank 100 is less, and most of the refrigerant is discharged through the first inlet/outlet pipe 101, thereby increasing the refrigerant flow rate of the refrigerant circulation circuit. Therefore, the air conditioner automatically adjusts the refrigerant flow of the refrigerant circulation loop through the liquid storage tank 100 in a refrigeration mode or a heating mode, and the energy efficiency of the air conditioner is effectively improved.

The embodiment of the present disclosure further provides a method for adjusting a refrigerant circulation amount of an air conditioner, including:

when the air conditioner is in a low-load operation condition, the refrigerant storage amount of the liquid storage tank is adjusted, and then the refrigerant circulation amount of the heat exchanger is adjusted.

When the air conditioner operates in a refrigeration mode, the air conditioner comprises different refrigeration operation working conditions such as rated refrigeration, intermediate refrigeration, low-temperature intermediate refrigeration and the like, the loads of the different refrigeration operation modes are different, and the optimal refrigerant quantity in a required refrigerant circulating flow path is also different. The low-load operation condition may be an operation condition lower than rated refrigeration, such as an operation condition of intermediate refrigeration, low-temperature intermediate refrigeration, and the like.

When the air conditioner is in the low-load operation working condition, the refrigerant storage amount of the liquid storage tank is adjusted, and then the refrigerant circulation amount of the heat exchanger is adjusted, namely, the refrigerant circulation amount of the air conditioner under the low-load operation working condition is adjusted, and the energy efficiency of the air conditioner is improved.

Optionally, adjusting the refrigerant storage capacity of the liquid storage tank, and then adjusting the refrigerant circulation capacity of the heat exchanger, includes: the method comprises the steps of obtaining the current operation capacity and the current operation power of the air conditioner, and increasing the storage amount of a refrigerant of a liquid storage tank when the current operation capacity meets a preset condition and the current operation power is larger than or equal to a first preset power threshold value so as to reduce the refrigerant circulation amount of a heat exchanger. Or when the current operation capacity is smaller than the preset capacity threshold value and the current operation power is smaller than a second preset power threshold value, the refrigerant storage capacity of the liquid storage tank is reduced so as to increase the refrigerant circulation volume of the heat exchanger.

The energy efficiency of an air conditioner is related to the operation capacity and operation power of the air conditioner. When the current operation capacity meets the preset condition and the current operation power is greater than or equal to the first preset power threshold value, the current operation power of the air conditioner is considered to be larger, and therefore the energy efficiency of the air conditioner is reduced. At the moment, the refrigerant storage capacity of the liquid storage tank can be increased to reduce the refrigerant circulation amount of the heat exchanger, so that the circulation amount of the whole refrigerant circulation system of the air conditioner is reduced, the operating power of the air conditioner is reduced, and the energy efficiency of the air conditioner is improved.

When the current operation capacity is smaller than the preset capacity threshold value and the current operation power is smaller than the second preset power threshold value, the current operation capacity of the air conditioner is considered to be lower, and the current operation power of the air conditioner is also lower, so that the energy efficiency of the air conditioner is lower. At the moment, the refrigerant storage capacity of the liquid storage tank can be reduced to increase the refrigerant circulation amount of the heat exchanger, so that the circulation amount of the whole refrigerant circulation system of the air conditioner is increased, the operation capacity and the operation power of the air conditioner are improved, and the energy efficiency of the air conditioner is improved.

Alternatively, the current operation capability satisfies the preset condition, which may be understood as that the current operation capability of the air conditioner is greater than or equal to a preset capability basic value. Alternatively, the preset capacity basic value of the air conditioner may be different under different loads, and the preset capacity basic value corresponding to the current operation load of the air conditioner may be selected according to the current operation load of the air conditioner.

Similarly, the first preset power threshold and the second preset power threshold of the air conditioner may be different under different loads, and the first preset power threshold and the second preset power threshold corresponding to the current operating load of the air conditioner may be selected according to the current operating load of the air conditioner.

Optionally, after acquiring the current operating capacity and the current operating power of the air conditioner, the method for adjusting the refrigerant circulation amount of the air conditioner further includes:

establishing a model curve of the running frequency of the compressor and the dryness of the first refrigerant pipe; obtaining the fitting dryness of the corresponding first refrigerant pipe under the current operating frequency of the compressor according to the model curve; obtaining the refrigerant storage capacity of the liquid storage tank under the current operation frequency of the compressor according to the fitting dryness; the first refrigerant pipe is a refrigerant pipe communicated with the second end of the first inlet and outlet pipe.

Optionally, the method for adjusting the refrigerant storage capacity of the liquid storage tank includes:

and adjusting the operation frequency of the compressor according to the corresponding relation between the operation frequency of the compressor and the dryness of the first refrigerant pipe in the model curve, and further adjusting the refrigerant storage capacity of the liquid storage tank.

Here, when the proportion of the liquid state in the refrigerant in the gas-liquid mixed state in the liquid storage tank is large, the refrigerant storage amount of the liquid storage tank is large, and when the proportion of the liquid state in the refrigerant in the gas-liquid mixed state in the liquid storage tank is small, the refrigerant storage amount of the liquid storage tank is small. Under different compressor operating frequencies, the dryness of the first refrigerant pipe in the gas-liquid two-phase area is different. And the first refrigerant pipe is directly communicated with the first inlet and outlet pipe of the liquid storage tank, so that the proportion of gas and liquid in the refrigerant in a gas-liquid mixed state entering the liquid storage tank can be obtained from the dryness fraction value of the first refrigerant pipe, and the current refrigerant storage capacity of the liquid storage tank is further obtained.

Optionally, the model curve of the operating frequency of the compressor and the dryness of the first refrigerant pipe is as follows:

k1= (P-B) × M + K, where K1 is a fitting quality of the first refrigerant pipe at the current operating frequency of the compressor, K is an initial quality of the first refrigerant pipe or a fitting quality of the first refrigerant pipe at a previous time, B is a set frequency of the compressor, P is the current operating frequency of the compressor, and M is a correlation coefficient.

when the air conditioner is in a low-load operation condition, the refrigerant storage amount of the liquid storage tank 100 is adjusted, and then the refrigerant circulation amount of the heat exchanger 200 is adjusted.

When the air conditioner is in the low-load operation condition, the refrigerant storage amount of the liquid storage tank 100 is adjusted, and further the refrigerant circulation amount of the heat exchanger 200 is adjusted, namely the refrigerant circulation amount of the air conditioner under the low-load operation condition is adjusted, and the energy efficiency of the air conditioner is improved.

Optionally, adjusting the refrigerant storage amount of the liquid storage tank 100, and thus adjusting the refrigerant circulation amount of the heat exchanger 200, includes:

and acquiring the current operation capacity and the current operation power of the air conditioner, and increasing the refrigerant storage capacity of the liquid storage tank 100 when the current operation capacity meets a preset condition and the current operation power is greater than or equal to a first preset power threshold value so as to reduce the refrigerant circulation amount of the heat exchanger 200. Or when the current operation capacity is smaller than the preset capacity threshold and the current operation power is smaller than the second preset power threshold, the refrigerant storage capacity of the liquid storage tank 100 is reduced to increase the refrigerant circulation amount of the heat exchanger 200.

The energy efficiency of an air conditioner is related to the operating capacity and operating power of the air conditioner. When the current operation capacity meets the preset condition and the current operation power is greater than or equal to the first preset power threshold, the current operation power of the air conditioner is considered to be larger, and therefore the energy efficiency of the air conditioner is reduced. At this time, the refrigerant storage amount of the liquid storage tank 100 can be increased to reduce the refrigerant circulation amount of the heat exchanger 200, so that the circulation amount of the whole refrigerant circulation system of the air conditioner is reduced, the operating power of the air conditioner is reduced, and the energy efficiency of the air conditioner is improved.

When the current operation capacity is smaller than the preset capacity threshold value and the current operation power is smaller than the second preset power threshold value, the current operation capacity of the air conditioner is considered to be lower, and the current operation power of the air conditioner is also lower, so that the energy efficiency of the air conditioner is lower. At this time, the refrigerant storage amount of the liquid storage tank 100 can be reduced to increase the refrigerant circulation amount of the heat exchanger 200, so that the circulation amount of the whole refrigerant circulation system of the air conditioner is increased, the operation capacity and the operation power of the air conditioner are improved, and the energy efficiency of the air conditioner is further improved.

Optionally, after the current operating capacity and the current operating power of the air conditioner are obtained, the method for adjusting the refrigerant circulation quantity of the air conditioner further includes:

establishing a model curve of the running frequency of the compressor and the dryness of the first refrigerant pipe; obtaining the fitting dryness of the corresponding first refrigerant pipe under the current operating frequency of the compressor according to the model curve; obtaining the refrigerant storage capacity of the liquid storage tank 100 under the current operation frequency of the compressor according to the fitting dryness; the first refrigerant pipe is a refrigerant pipe communicated with the second end of the first inlet and outlet pipe 101.

Optionally, the method for adjusting the refrigerant storage capacity of the liquid storage tank 100 includes:

and adjusting the operation frequency of the compressor according to the corresponding relation between the operation frequency of the compressor and the dryness of the first refrigerant pipe in the model curve, and further adjusting the refrigerant storage capacity of the liquid storage tank 100.

Here, when the ratio of the liquid state of the refrigerant in the gas-liquid mixed state in the receiver 100 is large, the refrigerant storage amount of the receiver 100 is large, and when the ratio of the liquid state of the refrigerant in the gas-liquid mixed state in the receiver 100 is small, the refrigerant storage amount of the receiver 100 is small. Under different compressor operating frequencies, the dryness of the first refrigerant pipe in the gas-liquid two-phase area is different. Moreover, the first refrigerant pipe is directly communicated with the first inlet and outlet pipe 101 of the liquid storage tank 100, so that the proportion of gas and liquid in the gas-liquid mixed refrigerant entering the liquid storage tank 100 can be obtained from the dryness fraction value of the first refrigerant pipe, and the current refrigerant storage capacity of the liquid storage tank 100 can be further obtained.

And obtaining the corresponding relation between different compressor operating frequencies and the fitting dryness of the first refrigerant pipe through the model curve. Optionally, at the beginning of the establishment of the model curve, the fitting quality of the current first refrigerant pipe is obtained according to the initial quality of the first refrigerant pipe. And then, calculating the fitting dryness K1 of the first refrigerant pipe under the current operating frequency of the compressor by taking the fitting dryness of the first refrigerant pipe at the previous moment as K. Alternatively, the set frequency of the compressor may be a set frequency of the compressor when the air conditioner is electrically operated.

Optionally, the refrigerant storage capacity of the receiver 100 is:

q = (H1 × K1+ H2 × 1-K1)) = V, in which Q is the refrigerant storage amount of the liquid storage tank 100, H1 is the saturated gaseous refrigerant density of the first refrigerant pipe at the current refrigerant temperature, H2 is the liquid refrigerant density of the first refrigerant pipe at the current refrigerant temperature, and V is the volume of the liquid storage tank 100.

According to the formula, the refrigerant storage quality of the liquid storage tank 100 under the current fitting dryness K1 can be calculated, and the refrigerant storage capacity of the liquid storage tank 100 corresponding to the current operation frequency of the compressor is further obtained.

Optionally, the value range of M includes 0.005-0.015.

Different correlation coefficients M may be selected according to the size of the air conditioner, for example, the larger the air conditioner, the smaller the correlation coefficient M, such as 0.005, 0.006, 0.007, 0.008, 0.009, or 0.010, etc., and the smaller the air conditioner, the larger the correlation coefficient M, such as 0.011, 0.012, 0.013, 0.014, or 0.015, etc. Alternatively, the correlation coefficient M may be selected differently according to the number of refrigerant pipes of the outdoor heat exchanger 200 of the air conditioner, for example, the correlation coefficient M is smaller as the number of refrigerant pipes is larger, such as 0.005, 0.006, 0.007, 0.008, 0.009, or 0.010, and the correlation coefficient M is larger as the number of refrigerant pipes is smaller, such as 0.011, 0.012, 0.013, 0.014, or 0.015. Alternatively, different correlation coefficients M may be selected according to the amount of refrigerant charge in the air conditioner, for example, the correlation coefficient M is smaller as the refrigerant charge is larger, such as 0.005, 0.006, 0.007, 0.008, 0.009, or 0.010, and the correlation coefficient M is larger as the refrigerant charge is smaller, such as 0.011, 0.012, 0.013, 0.014, or 0.015.

The method for adjusting the refrigerant circulation amount of the air conditioner provided by the present application will be described in detail below with reference to the above embodiments.

S01, when the air conditioner is in a low-load operation working condition, acquiring the current operation capacity and the current operation power of the air conditioner;

s02, establishing a model curve of the running frequency of the compressor and the dryness of the first refrigerant pipe, obtaining the fitting dryness of the first refrigerant pipe corresponding to the current running frequency of the compressor according to the model curve, and obtaining the refrigerant storage capacity of the liquid storage tank 100 at the current running frequency of the compressor according to the fitting dryness, namely obtaining the corresponding relation between the running frequency of the compressor and the refrigerant storage capacity of the liquid storage tank 100;

and S03, when the current operation capacity meets the preset condition and the current operation power is greater than or equal to a first preset power threshold value, according to the corresponding relation between the operation frequency of the compressor and the refrigerant storage amount of the liquid storage tank 100, the refrigerant storage amount of the liquid storage tank 100 is increased by adjusting the operation frequency of the compressor, so that the refrigerant circulation amount of the heat exchanger 200 is reduced.

When the current operation capacity is smaller than the preset capacity threshold value and the current operation power is smaller than the second preset power threshold value, the refrigerant storage amount of the liquid storage tank 100 is reduced by adjusting the operation frequency of the compressor according to the corresponding relationship between the operation frequency of the compressor and the refrigerant storage amount of the liquid storage tank 100, so that the refrigerant circulation amount of the heat exchanger 200 is increased.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural 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 embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat exchanger, comprising:

the heat exchange pipeline comprises a condensation section;

the liquid storage tank (100) is arranged at the condensation section and is provided with a first inlet and outlet pipe (101) and a second inlet and outlet pipe (102); the first end of the first inlet and outlet pipe (101) is communicated with the liquid storage tank (100), and the second end of the first inlet and outlet pipe is communicated with one part of the condensation section; the first end of the second inlet and outlet pipe (102) is communicated with the liquid storage tank (100), and the second end of the second inlet and outlet pipe is communicated with the other part of the condensation section; the distance from the first end of the first inlet and outlet pipe (101) to the bottom of the liquid storage tank (100) is smaller than the distance from the first end of the second inlet and outlet pipe (102) to the bottom of the liquid storage tank (100);

the heating device is arranged on the outer wall of the liquid storage tank (100) and used for heating the refrigerant in the liquid storage tank (100).

2. The heat exchanger of claim 1, wherein the heating device comprises:

and the heating coil (120) is arranged around the side surface of the liquid storage tank (100).

3. The heat exchanger of claim 2,

the heating coil (120) is positioned at the middle lower part of the side surface of the liquid storage tank (100).

4. The heat exchanger according to claim 2 or 3,

the power of the heating coil (120) is adjustable.

5. The heat exchanger of claim 2 or 3, further comprising:

the fins (130) surround the side surface of the liquid storage tank (100) and are uniformly arranged along the axis of the liquid storage tank (100);

the heating coil (120) is disposed between the adjacent fins (130).

6. The heat exchanger of claim 5,

the number of turns of the heating coil (120) between the adjacent fins (130) is the same.

7. An air conditioner characterized by comprising the heat exchanger according to any one of claims 1 to 6.

8. The air conditioner according to claim 7,

the heat exchanger (200) is used as an outdoor unit of the air conditioner.

9. The air conditioner according to claim 8,

when the air conditioner operates in a refrigeration mode, refrigerant flows into the liquid storage tank (100) from the first inlet and outlet pipe (101) and flows out of the liquid storage tank (100) from the second inlet and outlet pipe (102).

10. The air conditioner according to claim 8,

when the air conditioner operates in a heating mode, a refrigerant flows into the liquid storage tank (100) from the second inlet and outlet pipe (102) and flows out of the liquid storage tank (100) from the first inlet and outlet pipe (101).