Air conditioner defrosting system with multiple cooperative compressors

Abstract

An air conditioner defrosting system with multiple compressors cooperating comprises an indoor heat exchanger and an outdoor heat exchanger, at least two circulation loops are arranged between the indoor heat exchanger and the outdoor heat exchanger, and a compressor, a four-way valve and a throttling component are sequentially arranged on any circulation loop. According to the technical scheme, when one circulation loop executes the heating circulation, the frosting condition of the outdoor heat exchanger is obtained, if the outdoor heat exchanger has a frosting phenomenon or has a frosting tendency, the other circulation loop is controlled to execute the heating circulation, namely when the surface of the outdoor heat exchanger is frosted, the other circulation loop is controlled to execute the heating circulation; one compressor is used for defrosting, the other compressor is still used for heating, and the stability and safety of the water temperature of the system are ensured while the efficient defrosting requirement is met.

Description

[Technical field]

[0001] The utility model relates to the technical field of air conditioner defrosting, in particular to an air conditioner defrosting system with multiple compressors working together. [Background technology]

[0002] The air conditioner uses a compressor to compress the refrigerant, and the refrigerant absorbs and releases heat to achieve cooling and heating functions. In winter when the outdoor temperature is low, in order to maintain the indoor temperature, the air conditioner is running for heating. The low-temperature and low-pressure refrigerant absorbs heat in the outdoor heat exchanger of the air conditioner, which easily makes the body temperature of the outdoor heat exchanger lower than the outdoor temperature and frost forms, affecting the heat exchange efficiency of the outdoor heat exchanger, resulting in poor heating effect of the air conditioner.

[0003] To address the problem of frosting on the outdoor heat exchanger, the existing air-conditioning system adopts a single compressor defrosting method. During the defrosting process, the air-conditioning system will suspend the heating function and only use a single compressor for defrosting. Although this method can remove the frost layer, it is easy to cause large fluctuations in the system water temperature, affecting the stability of the indoor temperature, and also reducing the overall heating efficiency of the system. [Contents of the utility model]

[0004] In view of the shortcomings of the prior art, the purpose of the present application is to provide an air-conditioning defrosting system with multiple compressors coordinated, which can ensure the stability and safety of the system water temperature while meeting the needs of efficient defrosting.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A multi-compressor coordinated air conditioning defrosting system includes an indoor heat exchanger and an outdoor heat exchanger, wherein at least two circulation loops are respectively arranged between the indoor heat exchanger and the outdoor heat exchanger, and a compressor, a four-way valve and a throttling component are sequentially arranged on any of the circulation loops.

[0007] The utility model is further configured to include a bypass circuit, one end of which is connected to the pipeline between the compressor and the four-way valve, and the other end is connected to the pipeline between the outdoor heat exchanger and the throttling component; the bypass circuit is provided with a control valve for controlling opening and closing.

[0008] The utility model is further configured as follows: the bypass circuit is provided with a current limiting device which plays a current limiting role.

[0009] The utility model is further configured as follows: the circulation loop is also provided with a filtering device for removing medium impurities.

[0010] The utility model is further configured as follows: the circulation loop is also provided with an electromagnetic stop valve for opening and closing the loop.

[0011] The utility model is further configured as follows: the throttling component adopts an electronic expansion valve.

[0012] The utility model is further configured as follows: the outdoor heat exchanger is equipped with an information collection device for collecting temperature and humidity information, and the information collection device includes a temperature sensor and a humidity sensor.

[0013] The utility model is further configured to include: a control device for coordinating the operation of the compressor, the control device is connected to the information collection device, and the control device is connected to the compressor.

[0014] The utility model is further configured as follows: the outdoor heat exchanger is divided into at least two independent defrost areas, and each of the defrost areas is connected to the corresponding compressor through the four-way valve.

[0015] The utility model is further configured that: the number of the compressors is greater than the number of the defrosting areas.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The utility model obtains the frosting condition of the outdoor heat exchanger when one circulation loop executes the heating cycle. If frosting occurs or there is a tendency for frosting on the outdoor heat exchanger, the other circulation loop is controlled to execute the heating cycle. That is, when frosting occurs on the surface of the outdoor heat exchanger, one compressor is used for defrosting while the other compressor is still used for heating. The stability and safety of the system water temperature are ensured while meeting the demand for efficient defrosting.

Brief Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of the multi-compressor coordinated air conditioning defrosting system of this embodiment;

[0019] Figure 2 Schematic diagram of the bypass circuit of the air conditioning defrost system of this embodiment.

[0020] Figure numerals: 1. Indoor heat exchanger; 2. Outdoor heat exchanger; 3. Circulation loop; 31. Compressor; 32. Four-way valve; 33. Throttling component; 34. Filter device; 4. Bypass loop; 41. Control valve. [Specific implementation method]

[0021] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0022] It should be understood that the various steps described in the method implementation of the present utility model can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present utility model is not limited in this respect.

[0023] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "connected" may be directly connected or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0024] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0025] like Figure 1 and 2 As shown, the utility model discloses a multi-compressor coordinated air conditioning defrosting system, including an indoor heat exchanger and an outdoor heat exchanger, wherein at least two circulation loops are respectively arranged between the indoor heat exchanger and the outdoor heat exchanger, and a compressor, a four-way valve and a throttling component are sequentially arranged on any circulation loop. When one of the circulation loops performs a heating cycle, the frosting condition of the outdoor heat exchanger is obtained. If the outdoor heat exchanger is frosted or has a tendency to frost, the other circulation loop is controlled to perform a heating cycle, that is, when the surface of the outdoor heat exchanger is frosted, one compressor is used for defrosting, and the other compressor is still used for heating, so as to meet the demand for efficient defrosting while ensuring the stability and safety of the system water temperature.

[0026] By alternately defrosting, the system can effectively remove the frost on the surface of the outdoor heat exchanger while ensuring the heating effect. The system can maintain efficient operation in low-temperature winter environments while avoiding heating interruptions caused by long defrosting. At the same time, in a multi-compressor system, in order to ensure safe and efficient operation of the system, the number of compressors that are defrosted at the same time will be controlled. Usually, the number of compressors that are defrosted at the same time does not exceed 30% of all compressors. In a multi-compressor system, both the stability of the heating effect and the safety of the system can be taken into account.

[0027] Specifically, when the air conditioning system is in heating operation, the compressor sucks in low-temperature, low-pressure gas refrigerant. After compression, the refrigerant becomes high-temperature, high-pressure saturated gas and is sent to the indoor heat exchanger through a four-way valve. The high-temperature, high-pressure saturated gas releases heat in the indoor heat exchanger, and after cooling, it maintains constant pressure and condenses into low-temperature, high-pressure liquid and is discharged from the indoor heat exchanger. When passing through the throttling component, it is blocked, the gas pressure drops, and part of the liquid refrigerant turns into gas. During the transformation, it absorbs the latent heat of vaporization, and the temperature of the refrigerant itself also decreases, becoming low-temperature, low-pressure wet steam, and then enters the outdoor heat exchanger. In the outdoor heat exchanger, the low-temperature, low-pressure wet steam absorbs heat from the outdoor air while the pressure remains unchanged, making the air around the outdoor heat exchanger colder. The water vapor in the air easily condenses on the body of the outdoor heat exchanger, causing frost.

[0028] When defrosting is required, the high-temperature and high-pressure refrigerant gas discharged from another compressor is guided into the outdoor heat exchanger through the four-way valve. The high-temperature and high-pressure refrigerant gas can increase the body temperature of the outdoor heat exchanger in a relatively short time, so that the frost melts quickly.

[0029] Optionally, a bypass circuit is also included, one end of which is connected to the pipeline between the compressor and the four-way valve, and the other end is connected to the pipeline between the outdoor heat exchanger and the throttling component; the bypass circuit is provided with a control valve for controlling opening and closing.

[0030] When defrosting is required, the air conditioning system sends an open control command to the control valve, the control valve opens, and the high-temperature and high-pressure refrigerant gas discharged from the compressor directly enters the outdoor heat exchanger through the bypass loop. The high-temperature and high-pressure refrigerant gas can increase the body temperature of the outdoor heat exchanger in a short time, so that the frost melts quickly. After defrosting is completed, the air conditioning system sends a close control command to the control valve, the control valve closes, and the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the indoor heat exchanger through the four-way valve, and the air conditioning system continues to heat.

[0031] Specifically, the system uses the added bypass circuit to send the high-temperature and high-pressure gas compressed by the compressor directly to the outdoor heat exchanger for defrosting. During the defrosting process, the compressor does not stop, the four-way valve does not change direction, and the system continues to heat, which can greatly ensure the heating effect of the air conditioner and improve the user's comfort.

[0032] Optionally, in order to control the flow of high-temperature and high-pressure gas discharged from the compressor directly into the outdoor heat exchanger through the bypass loop during the defrost process, and thereby accurately defrost the outdoor heat exchanger, the bypass loop may be provided with a current limiting device that plays a current limiting role. The current limiting device may be a capillary tube, and the thickness of the capillary tube is set according to the power usage of the system; or the current limiting device may be a solenoid valve.

[0033] Optionally, the circulation loop is also provided with a filtering device for removing medium impurities. The filtering device is mainly responsible for removing impurities in the water in the system, such as particles, silt, rust, etc., to ensure the cleanliness of the water channels inside the system, to prevent the pipes, valves, pumps and other components in the system from being blocked by impurities, and to ensure the normal operation of the system.

[0034] Optionally, the circulation loop is also provided with an electromagnetic stop valve for opening and closing the loop, which plays a role in controlling the opening and closing of the circulation loop. When a circulation loop needs to be started or closed, the control device will send an instruction to the corresponding electromagnetic stop valve, and the electromagnetic stop valve will open or close according to the instruction, thereby controlling the flow of refrigerant in the loop, so that the system can flexibly adjust the operating state of each circulation loop as needed, thereby improving the flexibility and adaptability of the system.

[0035] Optionally, the throttling component adopts an electronic expansion valve, which can play the role of throttling and reducing pressure, and automatically adjust the refrigerant flow according to the actual operating status of the system. The electronic expansion valve accurately controls the refrigerant flow by receiving the signal sent by the control device to achieve more accurate temperature control.

[0036] Optionally, the outdoor heat exchanger is equipped with an information collection device for collecting temperature and humidity information, and the information collection device includes a temperature sensor and a humidity sensor. In addition, it also includes a control device for coordinating the operation of the compressor, the control device is connected to the information collection device, and the control device is connected to the compressor. Through the above-mentioned electronic control system, the wireless remote monitoring function of the defrost operation can be integrated, the working condition data of each compressor can be reported in real time, and hidden faults can be discovered and eliminated in time. The defrost control parameters, such as the defrost time interval, temperature setting value, etc., can be adjusted remotely to achieve more intelligent and precise control.

[0037] Specifically, an information collection device, namely a temperature sensor and a humidity sensor, is installed on the port of the liquid refrigerant of the outdoor heat exchanger, which transmits the detected defrosting temperature value to the control device connected thereto, and when the defrosting conditions are met, the control device sends a defrosting signal to the corresponding compressor. That is, the control device can obtain the frosting conditions and the degree of frosting of each coil through the information collection device, and can also obtain the temperature and humidity of the environment where the outdoor heat exchanger is located; of course, the present invention does not impose any restrictions on its specific acquisition method, and the technicians can set it according to the actual use requirements. For example, the above parameters can be obtained by setting a temperature sensor.

[0038] Optionally, the outdoor heat exchanger is divided into at least two independent defrost areas, each of which is connected to a corresponding compressor via a four-way valve. When frost occurs in any defrost area, the control device sends a command to the corresponding compressor, so that the corresponding compressor defrosts a specific area of ​​the outdoor heat exchanger without affecting the normal heating operation of other areas of the outdoor heat exchanger, thereby improving the flexibility and efficiency of the system.

[0039] Optionally, the number of compressors is greater than the number of defrost zones. This allows more compressors to participate in the heating cycle during the defrost process to ensure the stability of the indoor temperature. At the same time, the redundant compressors can also be used as backup to improve the reliability of the system. This ensures that during the defrost process, there are always compressors participating in the heating cycle to ensure the stability of the indoor temperature; at the same time, the redundant compressors can also be used as backup to improve the reliability of the system.

[0040] Some exemplary embodiments of the utility model are described above, but those skilled in the art will appreciate that changes may be made to these exemplary embodiments without departing from the principles or spirit of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A multi-compressor coordinated air conditioning defrosting system, characterized in that: It comprises an indoor heat exchanger and an outdoor heat exchanger, wherein at least two circulation loops are respectively arranged between the indoor heat exchanger and the outdoor heat exchanger, and a compressor, a four-way valve and a throttling component are arranged in sequence on any of the circulation loops.

2. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: It also includes a bypass circuit, one end of which is connected to the pipeline between the compressor and the four-way valve, and the other end is connected to the pipeline between the outdoor heat exchanger and the throttling component; the bypass circuit is provided with a control valve for controlling opening and closing.

3. The multi-compressor coordinated air conditioning defrosting system according to claim 2, characterized in that: The bypass circuit is provided with a current limiting device which plays a current limiting role.

4. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: The circulation loop is also provided with a filtering device for removing medium impurities.

5. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: The circulation loop is also provided with an electromagnetic stop valve for opening and closing the loop.

6. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: The throttling component adopts an electronic expansion valve.

7. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: The outdoor heat exchanger is equipped with an information collection device for collecting temperature and humidity information, and the information collection device includes a temperature sensor and a humidity sensor.

8. The multi-compressor coordinated air conditioning defrosting system according to claim 7, characterized in that: It also includes a control device for coordinating the operation of the compressor, wherein the control device is connected to the information collection device, and the control device is connected to the compressor.

9. The multi-compressor coordinated air conditioning defrosting system according to claim 1, characterized in that: The outdoor heat exchanger is divided into at least two independent defrost areas, and each of the defrost areas is connected to the corresponding compressor through the four-way valve.

10. The multi-compressor coordinated air conditioning defrosting system according to claim 9, characterized in that: The number of the compressors is greater than the number of the defrost zones.

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