CN109945330B - Refrigerating system capable of continuously heating and defrosting control method - Google Patents
Refrigerating system capable of continuously heating and defrosting control method Download PDFInfo
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- CN109945330B CN109945330B CN201910223365.3A CN201910223365A CN109945330B CN 109945330 B CN109945330 B CN 109945330B CN 201910223365 A CN201910223365 A CN 201910223365A CN 109945330 B CN109945330 B CN 109945330B
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- outdoor
- defrosting
- unit
- heating
- units
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a refrigerating system capable of continuously heating and a defrosting control method, comprising the following steps: when the system needs defrosting operation, one outdoor unit is controlled to defrost, and the other outdoor units keep heating operation. The invention can keep the heating mode of the indoor unit when the outdoor unit defrosts, avoids the fluctuation of the indoor environment temperature, ensures the use comfort of users, gives the optimal use experience to the users, and solves the problem that the indoor unit stops heating during the defrosting operation of the multi-connected unit.
Description
Technical Field
The invention relates to the field of air conditioning systems, in particular to a refrigerating system capable of continuously heating and a defrosting control method.
Background
The air source heat pump is increasingly widely applied to small and medium-sized buildings and partial public buildings, and is one of the most active central air conditioning systems at present; when the unit is in heating operation, the outdoor heat exchanger is used as an evaporator, the temperature of the evaporator is low, and when the temperature is lower than zero and the outdoor environment has certain humidity, the outdoor heat exchanger can frost; frosting of the outdoor heat exchanger can cause the heat exchange performance of the heat exchanger to be poor, air circulation is blocked, the heating capacity of a unit is poor, and no heating effect or even cold air blowing phenomenon can occur in serious cases; leading to poor user experience and even customer complaints; therefore, when the unit is in heating operation, the defrosting of the unit can be timely carried out according to the judgment of conditions such as the unit operation state and the like so as to ensure the heating effect of the unit; when the existing air conditioning unit is operated in defrosting mode, the direction is generally changed by a four-way valve, the mode is switched into a refrigerating operation mode, an indoor heat exchanger is used as an evaporator, an outdoor heat exchanger is used as a condenser, and a frost layer is melted by heat dissipated by the condenser through condensation; as such, during defrosting, since the indoor heat exchanger is an evaporator, it may cause the indoor ambient temperature to fluctuate, giving a user an uncomfortable experience.
Disclosure of Invention
The invention provides a refrigerating system capable of continuously heating and a defrosting control method, aiming at solving the defect that an indoor unit stops heating when a multi-connected unit is defrosted in the prior art.
The invention proposes a refrigeration system comprising: when the system needs defrosting operation, one outdoor unit is controlled to defrost, and the other outdoor units keep heating operation.
The outdoor unit includes: the system comprises a compressor, a four-way valve, an electronic expansion valve, a gas-liquid separator and an outdoor heat exchanger.
And the inlet and outlet pipeline of each outdoor unit is provided with a switch valve.
The invention also comprises a plurality of indoor units connected in parallel, and a switching valve is arranged on the pipeline of each indoor unit.
Preferably, the switching valve is a solenoid valve.
The invention also provides a defrosting control method of the refrigerating system, when the system needs to perform defrosting operation, one of the outdoor units is controlled to perform defrosting operation, and the other outdoor units are kept in heating operation.
In the outdoor unit in the heating operation mode, refrigerant compressed by the compressor is divided into two parts, one part flows to the indoor unit for heating, the other part flows to the outdoor unit in the defrosting operation mode, the outdoor heat exchanger is defrosted after passing through the flow regulating device and the compressor, and then the defrosted refrigerant is converged with the refrigerant flowing out of the indoor unit after passing through the electronic expansion valve and returns to the outdoor unit in the heating operation mode.
When only one outdoor unit in the system is started and operates in a heating operation mode, if an outdoor heat exchanger of the outdoor unit needs defrosting, other outdoor unit or units in the system are controlled to start heating operation.
When the outdoor heat exchangers of a plurality of outdoor units in the system need defrosting, defrosting operation is carried out in sequence according to a preset sequence, and the outdoor units in the non-defrosting operation mode keep a heating operation mode.
Further, the flow regulating device reduces the refrigerant throughput of the outdoor unit pipeline when the outdoor unit is defrosted.
Compared with the prior art, the invention controls one outdoor unit to convert the heating operation into the refrigerating operation for defrosting operation, so that the high-temperature refrigerant is defrosted by the outdoor heat exchanger of the outdoor unit, the other outdoor units keep heating operation, and the flow regulating device on the outdoor unit in defrosting operation is controlled, the refrigerant throughput of the pipeline communicated with the heating mode outlet of the four-way valve is reduced by the flow regulating device, and the refrigerant is prevented from circulating only between the outdoor units and not passing through the indoor unit. The indoor unit can keep a heating mode when the outdoor unit defrosts, so that fluctuation of indoor environment temperature is avoided, the use comfort of a user is ensured, the optimal use experience is provided for the user, and the problem that the indoor unit of the multi-connected unit stops heating during defrosting operation is solved.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of the flow direction of the refrigerant in the heating operation of the present invention;
fig. 2 is a schematic diagram of the flow direction of the refrigerant in the defrosting operation of the present invention.
Detailed Description
The invention provides a refrigerating system, which comprises a multi-connected unit, wherein the multi-connected unit comprises a controller, a plurality of outdoor units and indoor units which are connected in parallel, a flow regulating device 1 is arranged on a pipeline communicated with a heating mode outlet of a four-way valve in each outdoor unit, the flow regulating device 1 is a flow control valve, when the system needs defrosting operation, the controller controls one outdoor unit needing defrosting to be converted from heating operation to refrigerating operation for defrosting operation, so that high-temperature refrigerant defrosts an outdoor heat exchanger of the outdoor unit, the other outdoor units keep heating operation, the controller simultaneously controls the flow regulating devices 1 on the outdoor units in defrosting operation, the refrigerant throughput of the pipeline communicated with the heating mode outlet of the four-way valve is reduced through the flow regulating devices 1, and the refrigerant is prevented from circulating only between the outdoor units and not passing through. The indoor unit can keep a heating mode when the outdoor unit defrosts, so that fluctuation of indoor environment temperature is avoided, the use comfort of a user is ensured, the optimal use experience is provided for the user, and the problem that the indoor unit of the multi-connected unit stops heating during defrosting operation is solved.
The main components of the outdoor unit include: the air conditioner comprises a compressor 2, a four-way valve 3, an electronic expansion valve 4, a gas-liquid separator 5 and an outdoor heat exchanger 6, wherein power is provided for a refrigerant by the compressor 2 for circulation.
As shown in fig. 1, when all the outdoor units in the system are in the heating operation mode, the low-temperature and low-pressure gaseous refrigerant evaporated in the outdoor heat exchanger 6 flows into the compressor 2 through the vapor-liquid separator 5, is compressed by the compressor 2 to become a high-temperature and high-pressure gaseous refrigerant, flows to the indoor unit, is condensed by the indoor unit heat exchanger to become a high-pressure liquid refrigerant, is throttled by the heating electronic expansion valve 4 to become a low-pressure liquid refrigerant, and enters the outdoor heat exchanger 6 to be evaporated, thereby completing the whole cycle.
As shown in fig. 2, when one outdoor unit in the system is in the defrosting operation mode, the outdoor unit is switched from the heating operation mode to the cooling operation mode, and the other outdoor units still maintain the heating operation mode, in all the outdoor units in the heating operation mode, the low-temperature and low-pressure gaseous refrigerant evaporated in the outdoor heat exchanger 6 flows into the compressor 2 after passing through the vapor-liquid separator 5, and is compressed by the compressor 2 to become a high-temperature and high-pressure gaseous refrigerant, and the high-temperature gaseous refrigerant is divided into two parts, one part of which flows into the indoor unit, and is condensed into a medium-temperature and high-pressure liquid refrigerant after being condensed in the indoor heat exchanger of the indoor; the other part of the high-temperature gaseous refrigerant flows to the outdoor unit in the defrosting operation mode, is throttled by the flow regulating device 1 and then is secondarily compressed by the compressor 2 to form the high-temperature high-pressure gaseous refrigerant, flows to the outdoor heat exchanger 6 of the outdoor unit, is condensed and radiated in the outdoor heat exchanger 6 to defrost, is condensed and radiated to form the high-temperature gaseous refrigerant into the medium-temperature high-pressure liquid refrigerant, is converged with the refrigerant flowing back from the indoor unit, is throttled by the electronic expansion valve 4 of the outdoor unit in the heating operation mode to form the low-temperature low-pressure liquid refrigerant, and enters the outdoor heat exchanger 6 in the heating operation mode to evaporate, so that the circulation.
A switching valve 7 is arranged on a pipeline of each outdoor unit connected with the indoor unit, so that the outdoor units can be conveniently and independently stopped; and the pipeline connected with each indoor unit is also provided with a switch valve 7, which is an electromagnetic valve and is convenient for independently stopping the indoor unit.
The invention also provides a defrosting control method of the refrigerating system, when the system needs defrosting operation, one of the outdoor units is controlled to defrost, and the other outdoor units are controlled to keep heating operation.
In the outdoor unit in the heating operation mode, the compressed refrigerant is divided into two parts, and one part flows to the indoor unit for heating; the other part flows to the outdoor unit in defrosting operation, defrosting an outdoor heat exchanger of the outdoor unit after passing through the flow regulating device and the compressor, and then converging the defrosting refrigerant with the refrigerant flowing out of the indoor unit after passing through the electronic expansion valve to return to the outdoor unit in a heating operation mode.
When only one outdoor unit in the system is started and operates in a heating mode, if an outdoor heat exchanger of the outdoor unit needs defrosting, other outdoor units or a plurality of outdoor units in the system are controlled to start heating operation, and the indoor units can be guaranteed to continuously heat.
When outdoor heat exchangers of a plurality of outdoor units in the system need defrosting, defrosting operation is carried out in sequence according to a preset sequence, the outdoor units in the non-defrosting operation mode keep a heating operation mode, and the stability of the units is ensured.
The flow regulator reduces the refrigerant passing amount of the outdoor unit pipe when the outdoor unit is defrosted, and prevents the refrigerant from circulating only between the outdoor units and not passing through the indoor unit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A refrigeration system comprising: the multi-connected unit is characterized in that a flow regulating device (1) is arranged on a pipeline communicated with a four-way valve heating mode outlet in each outdoor unit, when the system needs defrosting operation, one of the outdoor units is controlled to perform defrosting operation, the other outdoor units are kept in heating operation, a controller controls the flow regulating device (1) on the outdoor unit in defrosting operation, and the refrigerant throughput of the pipeline communicated with the four-way valve heating mode outlet is reduced through the flow regulating device (1).
2. The refrigeration system of claim 1, wherein the outdoor unit comprises: the system comprises a compressor (2), a four-way valve (3), an electronic expansion valve (4), a gas-liquid separator (5) and an outdoor heat exchanger (6).
3. The refrigerating system as claimed in claim 1, wherein each of said outdoor units has an opening and closing valve (7) on an inlet and outlet pipe.
4. The refrigeration system according to claim 1, further comprising a plurality of indoor units connected in parallel, wherein a switching valve (7) is provided on a pipe of each of the indoor units.
5. A refrigerating system as claimed in claim 3 or 4, characterized in that said on-off valve (7) is a solenoid valve.
6. A defrosting control method of a refrigerating system as claimed in any one of claims 1 to 5, wherein when the system needs to perform a defrosting operation, one of the outdoor units is controlled to perform the defrosting operation, and the remaining outdoor units are controlled to maintain a heating operation.
7. The defrosting control method of claim 6, wherein the refrigerant compressed by the compressor of the outdoor unit in the heating operation mode is divided into two parts, and one part flows to the indoor unit for heating; the other part flows to the outdoor unit in defrosting operation, defrosting is carried out on the outdoor heat exchanger after passing through the flow regulating device and the compressor, and then the defrosting is converged with the refrigerant flowing out of the indoor unit after passing through the electronic expansion valve and returns to the outdoor unit in heating operation mode.
8. The defrosting control method of claim 6 wherein when only one outdoor unit in the system is turned on and operates in the heating operation mode, if the outdoor heat exchanger of the outdoor unit needs to be defrosted, the other outdoor unit or units in the system are controlled to start the heating operation.
9. The defrosting control method of claim 6, wherein when there are a plurality of outdoor heat exchangers of the outdoor units in the system to be defrosted, the defrosting operation is sequentially performed according to a predetermined order, and the outdoor units in the non-defrosting operation mode maintain the heating operation mode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910223365.3A CN109945330B (en) | 2019-03-22 | 2019-03-22 | Refrigerating system capable of continuously heating and defrosting control method |
| PCT/CN2019/127437 WO2020192202A1 (en) | 2019-03-22 | 2019-12-23 | Refrigeration system and defrosting control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910223365.3A CN109945330B (en) | 2019-03-22 | 2019-03-22 | Refrigerating system capable of continuously heating and defrosting control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109945330A CN109945330A (en) | 2019-06-28 |
| CN109945330B true CN109945330B (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910223365.3A Active CN109945330B (en) | 2019-03-22 | 2019-03-22 | Refrigerating system capable of continuously heating and defrosting control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109945330B (en) |
| WO (1) | WO2020192202A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945330B (en) * | 2019-03-22 | 2019-12-24 | 珠海格力电器股份有限公司 | Refrigerating system capable of continuously heating and defrosting control method |
| CN110500713B (en) * | 2019-08-22 | 2020-12-22 | 珠海格力电器股份有限公司 | Defrosting control method and device for ensuring continuous heating and multi-split system |
| CN110779080B (en) * | 2019-10-10 | 2021-03-23 | 珠海格力电器股份有限公司 | Continuous heating heat recovery air conditioner outdoor system, heat recovery air conditioner and using method thereof |
| CN112161378B (en) * | 2020-09-07 | 2022-06-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Outdoor unit defrosting control method and device and air conditioner |
| CN112539520B (en) * | 2020-12-17 | 2021-10-22 | 珠海格力电器股份有限公司 | Defrosting control method and device and multi-split air conditioner |
| CN112797587B (en) * | 2021-01-26 | 2022-01-28 | 珠海格力电器股份有限公司 | Air conditioner control method and air conditioner system |
| CN113944987B (en) * | 2021-11-24 | 2023-05-30 | 广东美的制冷设备有限公司 | Control method, device, equipment and storage medium of air conditioning system |
| CN114413416B (en) * | 2022-01-26 | 2023-04-25 | 宁波奥克斯电气股份有限公司 | Defrosting control method for multi-split air conditioner, storage medium and multi-split air conditioner |
| CN115585537B (en) * | 2022-12-12 | 2023-03-28 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device of multi-split system and multi-split system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197581A (en) * | 2014-09-01 | 2014-12-10 | 广东志高暖通设备股份有限公司 | Refrigerating and heating method and system of three-pipe heat recovery multiple-on-line system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952537A (en) * | 2005-10-17 | 2007-04-25 | 海尔集团公司 | Refrigerant circulation control device and method for multi-connected air conditioner |
| JP4920717B2 (en) * | 2009-04-21 | 2012-04-18 | 三菱電機株式会社 | Refrigeration equipment |
| EP2927623B1 (en) * | 2012-11-29 | 2019-02-06 | Mitsubishi Electric Corporation | Air-conditioning device |
| CN103123147A (en) * | 2013-03-27 | 2013-05-29 | 宁波奥克斯空调有限公司 | Variable refrigerant flow air conditioning system and control method thereof |
| CN203385256U (en) * | 2013-06-17 | 2014-01-08 | 南京天加空调设备有限公司 | Multi-split air conditioner parallel connection module system for defrosting without shutdown |
| CN203385089U (en) * | 2013-07-08 | 2014-01-08 | 南京天加空调设备有限公司 | Modularized multi-split air-conditioning system |
| CN105091436B (en) * | 2015-08-26 | 2018-04-17 | 珠海格力电器股份有限公司 | Air-conditioner set and its heating defrosting method |
| CN106969428A (en) * | 2017-05-09 | 2017-07-21 | 广东美的暖通设备有限公司 | Multi-connected air conditioner device |
| CN109269140B (en) * | 2018-10-30 | 2020-06-26 | 天津商业大学 | Air source heat pump unit capable of continuously supplying heat and defrosting |
| CN109945330B (en) * | 2019-03-22 | 2019-12-24 | 珠海格力电器股份有限公司 | Refrigerating system capable of continuously heating and defrosting control method |
-
2019
- 2019-03-22 CN CN201910223365.3A patent/CN109945330B/en active Active
- 2019-12-23 WO PCT/CN2019/127437 patent/WO2020192202A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197581A (en) * | 2014-09-01 | 2014-12-10 | 广东志高暖通设备股份有限公司 | Refrigerating and heating method and system of three-pipe heat recovery multiple-on-line system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109945330A (en) | 2019-06-28 |
| WO2020192202A1 (en) | 2020-10-01 |
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