WO2018058731A1

WO2018058731A1 - Air conditioning system, air conditioner, and air conditioning method

Info

Publication number: WO2018058731A1
Application number: PCT/CN2016/104107
Authority: WO
Inventors: 宋分平; 陈磊; 徐航; 刘军; 郝自亮; 周荣
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2016-09-30
Filing date: 2016-10-31
Publication date: 2018-04-05
Also published as: CN106369720A

Abstract

An air conditioning system, an air conditioner, and an air conditioning method. The air conditioning system comprises an indoor heat exchanger, a throttling means (4), and an outdoor heat exchanger (6) that are connected in sequence. The indoor heat exchanger and the outdoor heat exchanger (6) are both connected to a compressor (9) by means of a four-way valve (7). A heat exchanger (3) is connected between the throttling means (4) and the indoor heat exchanger, and the outdoor heat exchanger (6) is connected to the four-way valve (7) by means of the heat exchanger (3). Heat energy in a refrigerant discharged from the indoor heat exchanger can be recycled by means of heat exchange between the refrigerant discharged from the indoor heat exchanger and a refrigerant discharged from the outdoor heat exchanger (6). By increasing the temperature of the refrigerant discharged from the outdoor heat exchanger (6) while the refrigerant discharged from the indoor heat exchanger is undercooled, the temperature of return air of the compressor (9) is increased, so that the air exhaust temperature of the compressor (9) is increased, optimizing the overall heating capacity of the air conditioner.

Description

Air conditioning system, air conditioner and air conditioning method

cross reference

The present application claims priority to Chinese Patent Application No. 201610881148x, filed on Sep. 30,,,,,,,,,,,,,,,,,,, Application.

Technical field

The present invention relates to the field of air conditioning technology, and in particular, to an air conditioning system, an air conditioner, and an air conditioning method.

Background technique

The prior art air conditioning system comprises a sequential indoor heat exchanger, a throttling device, an outdoor heat exchanger, and the indoor heat exchanger and the outdoor heat exchanger are connected to the compressor through a four-way valve. When operating in a low temperature environment, the outdoor heat exchanger is severely frosted, thereby increasing the wind resistance of the outdoor unit, resulting in a decrease in the heat transfer coefficient of the heat exchanger and affecting the heating capacity of the air conditioner.

In addition, in a multi-air conditioner, the simultaneous opening of multiple internal machines often causes the air conditioner to fail to meet the heating capacity requirements of each indoor unit.

Summary of the invention

(1) Technical problems to be solved

The object of the present invention is to provide an air conditioning system, an air conditioner and an air conditioning method, which solve the problem of insufficient heating capacity of the existing air conditioner.

(2) Technical plan

In order to solve the above technical problem, the present invention provides an air conditioning system including an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in series, and the indoor heat exchanger and the outdoor heat exchanger pass through four a valve connected to the compressor; further comprising a heat exchanger, the heat exchanger comprising a first line and a second line; the line between the throttling device and the indoor heat exchanger being connected in series a pipeline, the pipeline between the outdoor heat exchanger and the four-way valve is connected in series with the second pipeline to achieve heat exchange.

Preferably, the S nozzle of the four-way valve is connected to the air return port of the compressor, and a heat storage device is connected between the S nozzle and the air return port, and the heat storage device is disposed in the compression a casing for absorbing and storing waste heat of the compressor casing.

Preferably, the heat storage device is provided with an electric heater for supplemental heating.

Preferably, the electric heater is a PTC electric heating rod.

Preferably, the number of the indoor heat exchangers is plural, and a plurality of the indoor heat exchangers are respectively connected in series with the first pipeline.

Preferably, the S-connector is directly connected with the three-way valve, the S-connector is connected to the inlet of the three-way valve, and the first outlet of the three-way valve is directly connected to the air return port. The second outlet of the three-way valve is connected to the air return port by the heat storage device.

The invention also provides an air conditioning method for the above air conditioning system, comprising the steps of:

Obtaining the operating mode of the air conditioning system;

If the air conditioning system is in the cooling mode, the spool of the three-way valve is controlled to move to dissipate the heat storage device, so that the refrigerant flowing out of the S interface flows directly back into the compressor;

If the air conditioning system is in the heating mode, the three-way valve spool is moved to conduct the heat storage device, so that the refrigerant flowing out of the S interface is preheated by the heat storage device and flows into the compressor.

Preferably, when the heat storage device is turned on and the electric heater for supplemental heating is provided in the heat storage device:

Determining whether the temperature in the heat storage device reaches a set temperature;

If the temperature in the heat storage device is lower than the set temperature, the heat storage device is heated by the electric heater;

If the temperature in the heat storage device is higher than the set temperature, the electric heater is turned off.

The invention also provides an air conditioner comprising the above air conditioning system.

Preferably, the heat exchanger is provided in an outdoor unit of the air conditioner.

(3) Beneficial effects

The technical solution of the present invention has the following advantages: the air conditioning system of the present invention includes An indoor heat exchanger, a throttling device, an outdoor heat exchanger connected in sequence, and the indoor heat exchanger and the outdoor heat exchanger are connected to a compressor through a four-way valve, in the throttling device and the indoor A heat exchanger is further connected between the heat exchangers, and the outdoor heat exchanger is connected to the four-way valve through the heat exchanger. In this solution, heat in the refrigerant flowing out of the indoor heat exchanger is exchanged with the refrigerant flowing out of the outdoor heat exchanger to recover heat in the refrigerant flowing out of the indoor heat exchanger. Specifically, the refrigerant flowing out of the indoor heat exchanger and the refrigerant flowing out of the outdoor heat exchanger exchange heat, and the refrigerant flowing out of the indoor heat exchanger can be supercooled while increasing the temperature of the refrigerant from the outdoor heat exchanger. Thereby, the return air temperature of the compressor is increased and the exhaust temperature of the compressor is further increased to optimize the heating capacity of the air conditioner as a whole.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

Figure 1 is a schematic structural view of an air conditioning system of an embodiment;

In the figure: 1, the refrigerant outlet high pressure pipeline; 2, heat storage device; 3, heat exchanger; 4, throttling device; 5, PTC electric heating rod; 6, outdoor heat exchanger; 7, four-way valve; 8, three-way valve; 9, compressor.

detailed description

The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and Simplifying the description, and not indicating or implying that the device or component referred to must have a particular orientation, constructed and operated in a particular orientation, Therefore, it should not be construed as limiting the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "connected" and "connected" are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly defined and defined. Ground connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

Referring to FIG. 1, the air conditioning system of the present embodiment includes an indoor heat exchanger, a throttle device 4, and an outdoor heat exchanger 6, which are sequentially connected, and the indoor heat exchanger and the outdoor heat exchanger 6 are both passed. The four-way valve 7 is connected to the compressor 9. Further, the air conditioning system further includes a heat exchanger 3 including a first conduit and a second conduit; the conduit between the throttle device 4 and the indoor heat exchanger is connected in series The first pipeline, the pipeline between the outdoor heat exchanger 6 and the four-way valve 7 is connected in series with the second pipeline to achieve heat exchange.

Here, the air conditioning system refers to a system in an air conditioner for increasing the room temperature or lowering the room temperature.

In the present embodiment, heat is exchanged between the refrigerant flowing out of the indoor heat exchanger and the refrigerant flowing out of the outdoor heat exchanger 6, thereby recovering heat in the refrigerant flowing out of the indoor heat exchanger. Specifically, the refrigerant flowing out of the indoor heat exchanger and the refrigerant flowing out of the outdoor heat exchanger 6 exchange heat, and the refrigerant flowing out of the outdoor heat exchanger 6 can be increased while the refrigerant flowing out of the indoor heat exchanger is supercooled. The temperature, thereby increasing the return air temperature of the compressor 9 and thereby increasing the exhaust temperature of the compressor 9, optimizes the heating capacity of the air conditioner as a whole.

Moreover, compared with the air conditioning system of the prior art, the air conditioning system of the present embodiment can reduce the defrosting time and period, thereby adapting to a lower outdoor environment.

In order to ensure that the refrigerant flowing out of the indoor heat exchanger and the refrigerant flowing out of the outdoor heat exchanger 6 exchange heat in the heat exchanger 3, the first pipeline and the second pipeline can be appropriately set, the first pipeline The specific arrangement of the second conduit and the second conduit are not described herein, and it should be understood that any of the arrangements disclosed in the prior art are included in the scope of protection of the present application. Furthermore, the throttling device 4 preferably, but not necessarily, employs an electronic expansion valve.

On the basis of the above, in the air conditioning system of the present embodiment, the S nozzle of the four-way valve 7 is connected to the air return port of the compressor 9, and a heat storage device is connected between the S nozzle and the air return port. 2. The heat storage device 2 is disposed in the outer casing of the compressor 9 for absorbing and storing waste heat of the outer casing of the compressor 9.

Here, the definition of "S takeover" is merely to distinguish the joint and other joints for connecting the return port of the compressor 9, which does not constitute a restriction on the four-way valve 7.

In this case, the heat storage device 2 can recover and reuse the waste heat on the outer casing of the compressor 9. Wherein, since the heat storage device 2 is disposed between the S nozzle and the air return port, it can preheat the refrigerant in the heat storage device 2 before returning the refrigerant to the compressor 9, thereby further increasing the return air temperature of the compressor 9 and Exhaust temperature to further optimize the heating capacity of the air conditioner.

Among them, the heat storage device 2 can be in a long-pass state. That is, regardless of the mode of operation of the air conditioning system, and regardless of the environment and other factors described in the air conditioning system, the refrigerant must first flow back through the heat storage device 2 back into the compressor 9.

Of course, it is also possible to control the on/off of the heat storage device 2 through a three-way valve 8, thereby disconnecting the heat storage device 2 when it is not needed. Specifically, a three-way valve 8 is connected between the S nozzle and the air return port, and the S nozzle is connected to the inlet of the three-way valve 8, and the first outlet of the three-way valve 8 is directly connected to the air return port. The second outlet of the three-way valve 8 is connected to the air return port through the heat storage device 2. Therefore, when the inlet of the three-way valve 8 is in communication with the first outlet, the refrigerant does not directly flow back to the compressor 9 through the heat storage device 2; when the inlet of the three-way valve 8 is in communication with the second outlet, the refrigerant is stored The preheating of the thermal device 2 is returned to the compressor 9. In this case, the three-way valve 8 can be adjusted in accordance with the operating mode of the air conditioning system. Of course, the three-way valve 8 can also be adjusted depending on the ambient temperature or other factors.

When the three-way valve 8 is adjusted according to the operation mode of the air conditioning system: when the air conditioning system is in the heating mode, in order to improve the heating capacity of the air conditioning system, it is desirable to increase the return air temperature of the compressor 9, and at this time, control the tee The spool of the valve 8 moves, so that the inlet of the three-way valve 8 is in communication with the second outlet; when the air conditioning system is in the cooling mode, there is not much demand for the return air temperature of the compressor 9 at this time, at this time, the control three The spool of the valve 8 moves, The inlet of the three-way valve 8 is brought into communication with the first outlet.

The three-way valve 8 in this embodiment is preferably, but not limited to, an electronic three-way valve 8.

It is worth mentioning that the heat storage device 2 in this embodiment can be disposed on other devices and can be disposed on other devices except that the waste heat of the casing 9 of the compressor 9 is absorbed and stored. Waste heat is absorbed and stored, not listed here.

In some cases, the temperature of the heat storage device 2 does not reach the set temperature, so that the return air temperature of the compressor 9 cannot be increased. At this time, in order to prevent the air conditioning system from being unstable or causing other disadvantages in order to prevent the return air temperature of the compressor 9 from being too low, it is preferable that the heat storage device 2 is provided with an electric heater for supplemental heating. Also, the electric heater is preferably, but not limited to, the PTC electric heating rod 5.

Further, a temperature sensor can be provided in the heat storage device 2. Further, the setting determination module determines the relationship between the temperature in the heat storage device 2 and the set temperature. When the temperature in the heat storage device 2 is lower than the set temperature, the PTC electric heating rod 5 is activated, otherwise the PTC electric heating rod 5 is turned off.

The air conditioning system of the present embodiment has a significant effect when it is applied to a multi-turn air conditioner technology, and can largely solve the problem of low heating capacity of a plurality of air conditioners.

In this case, the number of indoor heat exchangers is plural, and a plurality of the indoor heat exchangers are respectively connected in series with the first pipeline. For example, in Figure 1, the number of refrigerant outlet high pressure lines 1 is two, and the two refrigerant outlet high pressure lines 1 are respectively connected to an indoor heat exchanger (the indoor heat exchanger is not shown in Fig. 1), so that The number of indoor heat exchangers is also two. Of course, the number of indoor heat exchangers is not limited by the Figure 1.

The embodiment further provides an air conditioning method according to the above air conditioning system, which comprises the following steps:

Obtaining the operating mode of the air conditioning system;

If the air conditioning system is in the cooling mode, the spool of the three-way valve 8 is controlled to move to open the heat storage device 2, so that the refrigerant flowing out of the S interface flows directly back into the compressor 9;

If the air conditioning system is in the heating mode, control the three-way valve 8 spool to move The heat device 2 causes the refrigerant flowing out of the S interface to be preheated by the heat storage device 2 and then flows into the compressor 9.

Wherein, when the heat storage device 2 is turned on and the electric heat storage device 2 is provided with an electric heater for supplemental heating:

Determining whether the temperature in the heat storage device 2 reaches a set temperature;

If the temperature in the heat storage device 2 is lower than the set temperature, the heat storage device 2 is heated by using an electric heater;

If the temperature in the heat storage device 2 is higher than the set temperature, the electric heater is turned off.

Further, the embodiment further provides an air conditioner including the above air conditioning system. Wherein, it is determined whether the air conditioning system belongs to a cooling mode or a heating mode by receiving an indoor unit signal of the air conditioner. Further, since the compressor 9 is located in the outdoor unit of the air conditioner, it is preferable to provide the heat exchanger 3 on the outdoor unit of the air conditioner in order to simplify the configuration of the air conditioner.

The above embodiments are merely illustrative of the invention and are not intended to limit the invention. While the invention has been described in detail herein with reference to the embodiments of the embodiments of the present invention Within the scope of the claims of the present invention.

Industrial applicability

The air conditioning system, the air conditioner and the air conditioning method of the present invention, wherein the air conditioning system comprises an indoor heat exchanger, a throttling device and an outdoor heat exchanger connected in series, and the indoor heat exchanger and the outdoor heat exchanger pass through the four-way The valve is connected to the compressor, a heat exchanger is connected between the throttle device and the indoor heat exchanger, and the outdoor heat exchanger is connected to the four-way valve through the heat exchanger. In this solution, heat in the refrigerant flowing out of the indoor heat exchanger is exchanged with the refrigerant flowing out of the outdoor heat exchanger to recover heat in the refrigerant flowing out of the indoor heat exchanger. Specifically, the refrigerant flowing out of the indoor heat exchanger and the refrigerant flowing out of the outdoor heat exchanger exchange heat, and the refrigerant flowing out of the indoor heat exchanger can be supercooled while increasing the temperature of the refrigerant from the outdoor heat exchanger. Thereby, the return air temperature of the compressor is increased and the exhaust temperature of the compressor is further increased to optimize the heating capacity of the air conditioner as a whole. The air conditioning system of the present invention It conforms to the requirements of energy conservation and environmental protection, and is easy to promote, so it has industrial applicability.

Claims

An air conditioning system includes an indoor heat exchanger, a throttle device, and an outdoor heat exchanger connected in series, and the indoor heat exchanger and the outdoor heat exchanger are connected to a compressor through a four-way valve, wherein And a heat exchanger including a first conduit and a second conduit; a conduit between the throttle device and the indoor heat exchanger in series with the first conduit, The second conduit is connected in series with the line between the outdoor heat exchanger and the four-way valve to effect heat exchange.
The air conditioning system according to claim 1, wherein an S-connector of the four-way valve is connected to a return air port of the compressor, and a heat storage is connected between the S-connector and the air return port. And a heat storage device disposed on the compressor casing for absorbing and storing waste heat of the compressor casing.
The air conditioning system according to claim 2, wherein said heat storage device is provided with an electric heater for supplemental heating.
The air conditioning system of claim 3 wherein said electric heater is a PTC electric heating rod.
The air conditioning system according to claim 2, wherein the number of the indoor heat exchangers is plural, and a plurality of the indoor heat exchangers are respectively connected in series with the first pipeline.
The air conditioning system according to any one of claims 2 to 5, wherein a three-way valve is connected between the S nozzle and the air return port, and the S nozzle is connected to an inlet of the three-way valve. The first outlet of the three-way valve is directly connected to the air return port, and the second outlet of the three-way valve is connected to the air return port through the heat storage device.
An air conditioning method for an air conditioning system according to claim 6, comprising the steps of:

Obtaining the operating mode of the air conditioning system;

If the air conditioning system is in the cooling mode, control the inlet and the first outlet of the three-way valve Passing the heat storage device to disconnect the refrigerant flowing out of the S interface directly into the compressor;

If the air conditioning system is in the heating mode, the inlet of the control three-way valve and the second outlet are turned on to conduct the heat storage device, so that the refrigerant flowing out of the S interface is preheated by the heat storage device and flows into the compressor.
The method according to claim 7, wherein when the heat storage device is turned on and the electric heater for supplemental heating is provided in the heat storage device:

Determining whether the temperature in the heat storage device reaches a set temperature;

If the temperature in the heat storage device is lower than the set temperature, the heat storage device is heated by the electric heater;

If the temperature in the heat storage device is higher than the set temperature, the electric heater is turned off.
An air conditioner comprising the air conditioning system according to any one of claims 1 to 6.
The air conditioner according to claim 9, wherein the heat exchanger is provided in an outdoor unit of the air conditioner.