WO2021169526A1

WO2021169526A1 - Heat exchange device, air conditioner and control method therefor

Info

Publication number: WO2021169526A1
Application number: PCT/CN2020/137860
Authority: WO
Inventors: 杨公增; 姜荣伟
Original assignee: 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2020-02-28
Filing date: 2020-12-21
Publication date: 2021-09-02
Also published as: CN111426103A

Abstract

The present invention relates to the technical field of heat exchange, and specifically provides a heat exchange device, an air conditioner and a control method therefor. The present invention aims at solving the problem of low energy efficiency of the existing air conditioner under the partial load working condition. Therefore, the heat exchange device in the present invention comprises multiple heat exchange components. The heat exchange component comprises a first heat exchange branch and a second heat exchange branch connected in parallel. The first heat exchange branch is provided with a first switch valve. The second heat exchange branch is provided with a second switch valve. A communication branch is provided between the first heat exchange branch and the second heat exchange branch, and is provided with a one-way valve. One end of the communication branch is connected to an upstream of the first switch valve of the first heat exchange branch, and the other end of the communication branch is connected to a downstream of the second switch valve of the second heat exchange branch. According to the present invention, the first heat exchange branch and the second heat exchange branch can be merged into a refrigerant channel, so that the flow velocity of a refrigerant can also be ensured in the low load working condition, thereby effectively ensuring the heat exchange efficiency of the air conditioner.

Description

Heat exchange device, air conditioner and control method thereof

Technical field

The invention belongs to the field of heat exchange technology, and specifically provides a heat exchange device, an air conditioner and a control method thereof.

Background technique

With the continuous development of heat exchange technology, users have put forward higher and higher requirements for the comprehensive performance of air conditioners. Since the air conditioner is originally a high-energy-consumption electrical appliance, the energy-saving performance of the air conditioner is often concerned by users. In order to help users better understand the energy consumption levels of different air conditioners, the state has introduced air conditioner energy efficiency rating standards to better judge the energy efficiency level of air conditioners. However, since the energy efficiency standards of existing air conditioners are evaluated for the overall energy efficiency under full load conditions, the energy-saving design focus of existing air conditioners is often focused on the energy efficiency of the whole machine under full load conditions. The air conditioner is actually operated at a partial load condition during most of the working hours. Therefore, the existing air conditioner does not actually achieve a high energy-saving level on the whole.

Correspondingly, a new heat exchange device, air conditioner and control method thereof are needed in the art to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of low energy efficiency of existing air conditioners under partial load conditions, the present invention provides a heat exchange device for an air conditioner. It includes a plurality of heat exchange components, the heat exchange components include a first heat exchange branch and a second heat exchange branch connected in parallel, a first on-off valve is arranged on the first heat exchange branch, and the first A second switch valve is provided on the second heat exchange branch, a communication branch is provided between the first heat exchange branch and the second heat exchange branch, a one-way valve is provided on the communication branch, and One end of the communication branch is connected to the upstream of the first switch valve of the first heat exchange branch, and the other end of the communication branch is connected to the second switch of the second heat exchange branch Downstream of the valve.

In the preferred technical solution of the above heat exchange device, the first on-off valve is arranged at a downstream part of the first heat exchange branch.

In the preferred technical solution of the above heat exchange device, the second on-off valve is arranged in the upstream part of the second heat exchange branch.

In the preferred technical solution of the above heat exchange device, the heat exchange device further includes a heat exchange body, and at least a part of the first heat exchange branch and/or the second heat exchange branch passes through the heat exchange Heat in the main body.

In the preferred technical solution of the above heat exchange device, the first on-off valve and/or the second on-off valve are solenoid valves.

The present invention also provides an air conditioner, which includes the heat exchange device described in any one of the above-mentioned preferred technical solutions.

The present invention also provides a control method for an air conditioner. The air conditioner includes a heat exchange device, the heat exchange device includes a plurality of heat exchange components, and the heat exchange components include first heat exchange components connected in parallel. The first heat exchange branch is provided with a first on-off valve, the second heat exchange branch is provided with a second on-off valve, and the first heat exchange branch is connected to the second heat exchange branch. A communication branch is arranged between the second heat exchange branches, a one-way valve is arranged on the communication branch, and one end of the communication branch is connected to the first heat exchange branch of the first heat exchange branch. Upstream of the on-off valve, the other end of the communication branch is connected to the downstream of the second on-off valve of the second heat exchange branch; the control method includes: obtaining the demand load of the air conditioner; The required load of the air conditioner controls the opening and closing states of the first on-off valve and the second on-off valve of each of the heat exchange components.

In the preferred technical solution of the above control method, the step of "controlling the opening and closing states of the first on-off valve and the second on-off valve of each of the heat exchange components according to the demand load of the air conditioner" Including: if the ratio of the required load of the air conditioner to the full load of the air conditioner is less than a preset ratio, controlling a preset number of the first on-off valves and the second on-off valves of the heat exchange assembly The on-off valve is closed and the first on-off valve and the second on-off valve that control the remaining heat exchange components are opened.

In the preferred technical solution of the above control method, the preset number is determined according to the difference between the preset ratio and the ratio of the demand load of the air conditioner to the full load of the air conditioner.

In the preferred technical solution of the above control method, the step of "controlling the opening and closing states of the first on-off valve and the second on-off valve of each of the heat exchange components according to the demand load of the air conditioner" It also includes: if the ratio of the demand load of the air conditioner to the full load of the air conditioner is greater than or equal to the preset ratio, controlling the first on-off valves and the first on-off valves of all the heat exchange components and the The second on-off valve is opened.

Those skilled in the art can understand that in the technical solution of the present invention, the heat exchange device of the present invention includes a plurality of heat exchange components, and the heat exchange components include a first heat exchange branch and a second heat exchange branch connected in parallel. A heat exchange branch, a first switch valve is arranged on the first heat exchange branch, a second switch valve is arranged on the second heat exchange branch, and the first heat exchange branch communicates with the second heat exchange A communication branch is provided between the branches, a one-way valve is provided on the communication branch, and one end of the communication branch is connected to the upstream of the first switch valve of the first heat exchange branch, so The other end of the communication branch is connected to the downstream of the second switch valve of the second heat exchange branch. When the air conditioner needs to operate under heavy load conditions, the first on-off valve and the second on-off valve are controlled to open, and the heat exchange assembly has the first heat exchange branch and the second There are two refrigerant flow passages in the heat exchange branch, and the large amount of refrigerant involved in circulating heat exchange in the air conditioner can maintain the best flow state in the heat exchange device, so as to effectively ensure that the air conditioner can maintain under heavy load conditions The state of high-efficiency heat exchange; when the air conditioner needs to operate under low load conditions, the first on-off valve and the second on-off valve are controlled to close, and the first heat exchange branch and the second The heat exchange branches can be merged into a refrigerant flow channel through the communicating branches. Therefore, although the circulation of the refrigerant per unit time in the air conditioner is reduced, the refrigerant can still maintain the optimum in the heat exchange device Flow state, so as to effectively ensure that the air conditioner can still maintain an efficient heat exchange state under low load conditions, and because the first heat exchange branch and the second heat exchange branch pass through the communicating branch It is merged into a refrigerant flow channel, so that the refrigerant can still flow through most of the pipes in the heat exchange device, so that the refrigerant flow area of the heat exchange device is retained to the greatest extent, thereby further effectively improving the air conditioner The heat exchange efficiency of the heat exchanger under low load conditions.

Further, in the present invention, the first on-off valve is arranged in the downstream part of the first heat exchange branch. When the first on-off valve is closed, this arrangement can effectively prolong the flow of refrigerant in the first exchange. The flow length in the hot branch can effectively ensure the refrigerant flow area of the heat exchange device, thereby effectively ensuring the heat exchange efficiency of the air conditioner.

Further, in the present invention, the second on-off valve is arranged in the upstream part of the second heat exchange branch. When the second on-off valve is closed, this arrangement can effectively prolong the refrigerant in the second exchange. The flow length in the hot branch can further effectively ensure the refrigerant flow area of the heat exchange device, thereby ensuring the heat exchange efficiency of the air conditioner to the greatest extent.

Those skilled in the art can understand that in the technical solution of the present invention, the control method of the present invention can control the first on-off valve and the second on-off valve corresponding to each heat exchange component according to the demand load of the air conditioner. The open and closed state can control the flow rate of the refrigerant in the heat exchange branch by controlling the connection of each heat exchange component, thereby effectively ensuring that the air conditioner can operate efficiently under low load conditions.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the heat exchange device of the present invention;

2 is a flowchart of specific steps of a preferred embodiment of the control method of the present invention;

Reference signs: 11, main inlet pipe; 12, main outlet pipe; 13, heat exchange assembly; 131, first heat exchange branch; 1311, first solenoid valve; 132, second heat exchange branch; 1321, first Two solenoid valves; 133, connecting branch; 1331, one-way valve; 14, heat exchange body; 141, through hole.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the various steps of the method of the present invention are described in a specific order in this application, these orders are not limitative, and those skilled in the art can follow a different order without departing from the basic principles of the present invention. Perform the steps described.

It should be noted that in the description of the preferred embodiment, the terms "left", "right", "front", "rear", "inner", "outer" and other terms indicating the direction or positional relationship are based on the appendix The direction or position relationship shown in the figure is only for ease of description, and does not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly defined and defined, the terms "connected" and "connected" should be interpreted broadly, for example, they may be directly connected or indirectly through an intermediary. The connection can also be the connection between the two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

First, refer to FIG. 1, which is a schematic diagram of the overall structure of the heat exchange device of the present invention. As shown in Figure 1, the air conditioner of the present invention includes a heat exchange device including a main inlet pipe 11, a main outlet pipe 12, and a plurality of heat exchange components 13; There are two heat exchange components 13, but the technicians can obviously set the number of heat exchange components 13 according to actual use requirements. This specific number change does not deviate from the basic principle of the present invention. Specifically, the multiple heat exchange components 13 are connected in parallel, the main inlet pipe 11 is connected to the multiple heat exchange components 13, so as to supply refrigerant to the multiple heat exchange components 13, and the main outlet pipe 12 is also connected to the multiple heat exchange components. The components 13 are connected so that the refrigerant in the multiple heat exchange components 13 can flow out through the main outlet pipe 12. Of course, although the heat exchange device described in this preferred embodiment is provided with a main inlet pipe 11 and a main outlet pipe 12, the heat exchange device can also directly connect the two ends of the multiple heat exchange components 13 with other components. The change of this specific connection mode does not deviate from the basic principle of the present invention, and the present invention does not impose any restrictions on the location of the heat exchange device in the air conditioner. The technician can set it according to actual needs. Certainly. In addition, those skilled in the art can understand that the technical personnel can set the specific structures of the main inlet pipe 11 and the main outlet pipe 12, such as copper pipes, by themselves according to actual use requirements, and the change of this specific structure does not deviate from the present invention. The basic principle of should belong to the protection scope of the present invention.

Further, the heat exchange assembly 13 includes a first heat exchange branch 131 and a second heat exchange branch 132 connected in parallel, wherein the first heat exchange branch 131 is provided with a first solenoid valve 1311, and the second heat exchange branch 131 is provided with a first solenoid valve 1311. A second solenoid valve 1321 is provided on the hot branch 132, a communication branch 133 is provided between the first heat exchange branch 131 and the second heat exchange branch 132, and a check valve 1331 is provided on the communication branch 133, and The upper end of the communication branch 133 is connected to the upstream of the first solenoid valve 1311 of the first heat exchange branch 131, and the lower end of the communication branch 133 is connected to the downstream of the second solenoid valve 1321 of the second heat exchange branch 132. Those skilled in the art can understand that the present invention does not impose any restrictions on the specific connection positions of the two ends of the connecting branch 133, and the technicians can adjust themselves according to actual usage requirements. In addition, although the on-off valve selected in this preferred embodiment is a solenoid valve, the skilled person can obviously also set the type of the on-off valve according to actual use requirements, as long as the on-off valve can control the on-off of the branch. The status is sufficient, and the technician can select the specific type of the one-way valve 1331 by himself.

Continuing to refer to FIG. 1, in this preferred embodiment, the heat exchange device further includes a heat exchange main body 14. The heat exchange main body 14 has a plate-like structure, and the heat exchange main body 14 is provided with a plurality of through holes 141. Pass through the heat exchange body 14 transversely, that is, each through hole 141 traverses the entire heat exchange body 14. The first heat exchange branch 131 and the second heat exchange branch 132 pass through the through hole 141 so as to be able to communicate with The heat exchange body 14 performs heat exchange, and is preferably provided back and forth in the plurality of through holes 141 to effectively improve the heat exchange effect. In addition, the heat exchange body 14 is preferably made of a metal material, and is also provided with a fin structure around it, so as to further effectively improve the heat exchange effect. Those skilled in the art can understand that the present invention does not impose any restrictions on the specific structure of the heat exchange main body 14, and the technicians can set it according to actual use requirements; and the present invention does not impose any restrictions on the first heat exchange branch 131 and the second heat exchange branch 131 and the second heat exchange branch. The connection relationship between the heat branch 132 and the heat exchange main body 14 is subject to any restriction, as long as the first heat exchange branch 131 and the second heat exchange branch 132 can better exchange heat with the outside through the heat exchange main body 14.

Further, referring to the orientation in FIG. 1, the first solenoid valve 1311 is arranged at a position close to the end of the right end of the first heat exchange branch 131, that is, the first solenoid valve 1311 is located on the right side of the heat exchange body 14, and the second solenoid valve 1311 is located on the right side of the heat exchange main body 14. The solenoid valve 1321 is arranged at a position close to the front end of the left end of the second heat exchange branch 132, that is, the second solenoid valve 1321 is located on the left side of the heat exchange body 14. It should be noted that the first solenoid valve 1311 is preferably arranged at the first The downstream part of a heat exchange branch 131 (refer to the flow direction of the refrigerant), so that the refrigerant can flow through most of the pipes of the first heat exchange branch 131 and then flow into the communicating pipeline 133; the second solenoid valve 1321 is preferably arranged in The upstream portion of the second heat exchange branch 132 (refer to the flow direction of the refrigerant), so that the refrigerant can flow through most of the pipes of the second heat exchange branch 132 and then flow out of the heat exchange assembly 13. In this preferred embodiment, when the first solenoid valve 1311 and the second solenoid valve 1321 are closed, the refrigerant can flow rightward along the first heat exchange branch 131, and flow through the first heat exchange branch 131 at the heat exchange After all the pipes in the main body 14 flow into the second heat exchange branch 132 through the connecting branch 133, and then flow to the right along the second heat exchange branch 132 until it flows through the second heat exchange branch 132 and is located in the second heat exchange branch 132. All the pipes in the heat main body 14 then flow out through the main outlet pipe 12. It should be noted that those skilled in the art can set the specific structure types of the first heat exchange branch 131 and the second heat exchange branch 132 according to actual use requirements, as long as the first heat exchange branch 131 and the second heat exchange branch 132 The branch 132 only needs to be able to circulate the refrigerant.

Next, refer to FIG. 2, which is a flowchart of specific steps of a preferred embodiment of the control method of the present invention. As shown in FIG. 2, based on the air conditioner described in the above preferred embodiment, the air conditioner further includes a controller that can obtain the demand load of the air conditioner, and the controller can obtain the required load of the air conditioner according to the The demand load quantity controls the opening and closing states of the first solenoid valve 1311 and the second solenoid valve 1321, thereby controlling the operating state of the air conditioner. Those skilled in the art can understand that the present invention does not impose any restrictions on the specific structure and model of the controller, and the controller may be the original controller of the air conditioner, or it may be used to implement the present invention. For the controller that is set separately according to the control method, technicians can set the structure and model of the controller by themselves according to actual use requirements. The preferred embodiment of the control method of the present invention specifically includes the following steps:

S101: Obtain the demand load of the air conditioner;

S102: Calculate the ratio of the demand load to the full load;

S103: If the calculated ratio is less than the preset ratio, control the first solenoid valve and the second solenoid valve of the preset number of heat exchange components to close and control the first solenoid valve and the second solenoid valve of the remaining heat exchange components to open;

S104: If the calculated ratio is greater than or equal to the preset ratio, control the opening of the first solenoid valve and the second solenoid valve of all the heat exchange components.

Specifically, in steps S101 and S102, the controller can obtain the demand load of the air conditioner, and calculate the demand load and the full load of the air conditioner based on the acquired demand load. Ratio. It should be noted that the present invention does not impose any restriction on the specific method for the controller to obtain the required load. The technician can set the judgment standard of the required load according to the type of air conditioner and actual use demand, for example, according to the target The difference between the temperature and the indoor temperature is used for determination. The change of this specific determination method does not deviate from the basic principle of the present invention, as long as its control method is to control the first solenoid valve 1311 and the first solenoid valve 1311 and the first solenoid valve 1311 according to the demand load of the air conditioner. The opening and closing states of the two solenoid valves 1321 belong to the protection scope of the present invention.

Further, in step S103, if the calculated ratio is less than the preset ratio, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of the preset number of heat exchange components 13 to close and control The first solenoid valve 1311 and the second solenoid valve 1321 of the remaining heat exchange assembly 13 are opened; it should be noted that the technician can set the size of the preset ratio by himself according to actual use requirements, preferably, the preset ratio It is 0.8. This change of the standard value does not deviate from the basic principle of the present invention and belongs to the protection scope of the present invention. When the calculated ratio is less than the preset ratio, the refrigerant in the heat exchange device cannot achieve the best flow state in the heat exchange branch, so it is difficult for the air conditioner to achieve high heat exchange efficiency In this case, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of the preset number of heat exchange components 13 to close, and controls the first solenoid valve 1311 and the second solenoid valve 1311 of the remaining heat exchange components 13 The valve 1321 is opened, that is, the controller can control the first heat exchange branch 131 and the second heat exchange branch 132 of the part of the heat exchange assembly 13 to merge into a refrigerant flow channel, so as to effectively ensure that the refrigerant is in the first heat exchange branch. The flow state in the path 131 and the second heat exchange branch 132, thereby effectively ensuring the heat exchange efficiency of the heat exchange device. In addition, in step S104, if the calculated ratio is greater than or equal to the preset ratio, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of all the heat exchange components 13 to open so as to maximize The fast heat exchange speed meets the heat exchange needs of users as soon as possible.

As a preferred embodiment, when the calculated ratio is greater than or equal to 0.6 and less than 0.8, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of one group of heat exchange components 13 to close, that is, to pre- Set the number to 1; when the calculated ratio is greater than or equal to 0.4 and less than 0.6, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of the two sets of heat exchange components 13 to close, that is, the preset number When the calculated ratio is greater than or equal to 0.2 and less than 0.4, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of the three groups of heat exchange components 13 to close, that is, the preset number is 3. When the calculated ratio is less than 0.2, the controller controls the first solenoid valve 1311 and the second solenoid valve 1321 of the four groups of heat exchange components 13 to close, that is, the preset number is 4. Of course, the setting of this specific numerical range is not restrictive, and technicians can make adjustments according to actual usage requirements. In addition, those skilled in the art can also understand that the technical personnel can set the size of the preset number according to actual use requirements; preferably, the preset number is based on the difference between the preset ratio and the aforementioned ratio. The size is determined, and the greater the difference, the greater the preset number. Of course, the specific value of the preset number also needs to be set according to the specific structure of the heat exchange device and the specific structure of the air conditioner.

Finally, it should be noted that the above-mentioned examples are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. When using the present invention in practice, those skilled in the art can appropriately add or delete a part of the steps as needed, or exchange the order between different steps. This change does not go beyond the basic principle of the present invention, and belongs to the protection scope of the present invention.

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

Claims

A heat exchange device for an air conditioner, characterized in that the heat exchange device includes a plurality of heat exchange components, and the heat exchange components include a first heat exchange branch and a second heat exchange branch connected in parallel. road,

A first on-off valve is provided on the first heat exchange branch, and a second on-off valve is provided on the second heat exchange branch,

A communicating branch is provided between the first heat exchange branch and the second heat exchange branch, a one-way valve is provided on the communicating branch, and one end of the communicating branch is connected to the first The upstream of the first switch valve of the heat exchange branch, and the other end of the communication branch is connected to the downstream of the second switch valve of the second heat exchange branch.
The heat exchange device according to claim 1, wherein the first on-off valve is arranged in a downstream part of the first heat exchange branch.
The heat exchange device according to claim 2, wherein the second on-off valve is arranged in an upstream part of the second heat exchange branch.
The heat exchange device according to claim 1, wherein the heat exchange device further comprises a heat exchange body, and at least a part of the first heat exchange branch and/or the second heat exchange branch passes through In the heat exchange body.
The heat exchange device according to any one of claims 1 to 4, wherein the first on-off valve and/or the second on-off valve are solenoid valves.
An air conditioner, characterized in that the air conditioner comprises the heat exchange device according to any one of claims 1 to 5.
A control method for an air conditioner, characterized in that the air conditioner includes a heat exchange device, the heat exchange device includes a plurality of heat exchange components, and the heat exchange components include first heat exchange components connected in parallel. Branch and the second heat exchange branch, the first heat exchange branch is provided with a first on-off valve, the second heat exchange branch is provided with a second on-off valve, the first heat exchange branch is connected to the A communication branch is arranged between the second heat exchange branches, a one-way valve is arranged on the communication branch, and one end of the communication branch is connected to the first switch of the first heat exchange branch Upstream of the valve, the other end of the communication branch is connected to the downstream of the second switch valve of the second heat exchange branch;

The control method includes:

Acquiring the demand load of the air conditioner;

According to the demand load of the air conditioner, the opening and closing states of the first on-off valve and the second on-off valve of each of the heat exchange components are controlled.
The control method according to claim 7, characterized in that "control the opening and closing of the first on-off valve and the second on-off valve of each of the heat exchange components according to the demand load of the air conditioner The steps of "Status" include:

If the ratio of the demand load of the air conditioner to the full load of the air conditioner is less than a preset ratio, control a preset number of the first on-off valves and the second on-off valves of the heat exchange assembly Closing and controlling the opening of the first on-off valve and the second on-off valve of the remaining heat exchange components.
The control method according to claim 8, wherein the preset number is determined according to a difference between the preset ratio and the ratio of the demand load of the air conditioner to the full load of the air conditioner .
The control method according to claim 8, characterized in that "in accordance with the demand load of the air conditioner, the opening of the first on-off valve and the second on-off valve of each of the heat exchange components is controlled. The steps of "closed state" also include:

If the ratio of the demand load of the air conditioner to the full load of the air conditioner is greater than or equal to the preset ratio, the first switch valves and the second switches of all the heat exchange components are controlled The valve opens.