CN110296554B - Shunting assembly, shunting control method thereof and multi-connected air conditioner - Google Patents
Shunting assembly, shunting control method thereof and multi-connected air conditioner Download PDFInfo
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- CN110296554B CN110296554B CN201910589717.7A CN201910589717A CN110296554B CN 110296554 B CN110296554 B CN 110296554B CN 201910589717 A CN201910589717 A CN 201910589717A CN 110296554 B CN110296554 B CN 110296554B
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- electronic expansion
- expansion valve
- opening degree
- control method
- temperature sensing
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a shunt assembly, a shunt control method thereof and a multi-connected air conditioner. The flow dividing assembly comprises a first electronic expansion valve, a flow divider, a plurality of second electronic expansion valves, a first temperature sensing bulb and a plurality of second temperature sensing bulbs, wherein the first electronic expansion valve, the flow divider and the plurality of second electronic expansion valves are sequentially connected; the first temperature sensing bulb is arranged on a pipeline between the first electronic expansion valve and the flow divider, and one second temperature sensing bulb is arranged on a pipeline of each second electronic expansion valve correspondingly communicated with one indoor unit. The opening degree of the first electronic expansion valve and/or the second electronic expansion valve is regulated and controlled, so that the pressure ratio before and after the second electronic expansion valve is larger than or equal to a set value, and the purpose of achieving shunting control meeting the use requirements of each evaporator is achieved.
Description
Technical Field
The invention belongs to the technical field of air conditioner control, and particularly relates to a shunt assembly, a shunt control method thereof and a multi-connected air conditioner.
Background
The current split-flow control method between the indoor units of the two-stage compression multi-connected air conditioner is to split the air to each indoor unit through a split-flow pipe; meanwhile, the electronic expansion valves corresponding to the indoor units adjust the flow according to the superheat degree corresponding to the indoor units.
The shunting method is easy to cause that each indoor unit is fully opened or opened more, the shunting does not meet the requirement, and sometimes the problem cannot be solved even if the difference adjustment compensation of a larger (or limit) step number of each electronic expansion valve is used, so that a certain indoor unit cannot obtain the required capacity under certain conditions.
Disclosure of Invention
Therefore, an object of the present invention is to provide a flow distribution assembly, a flow distribution control method thereof, and a multi-connected air conditioner, which can control the flow distribution state of each indoor unit and meet the respective use requirements of the indoor units.
In order to solve the above problems, the present invention provides a flow dividing assembly, which comprises a first electronic expansion valve, a flow divider, a plurality of second electronic expansion valves, a first thermal bulb and a plurality of second thermal bulbs, wherein the first electronic expansion valve, the flow divider, the plurality of second electronic expansion valves are sequentially connected; the first temperature sensing bulb is arranged on a pipeline between the first electronic expansion valve and the flow divider, and one second temperature sensing bulb is arranged on a pipeline of each second electronic expansion valve correspondingly communicated with one indoor unit.
Preferably, a plurality of the second electronic expansion valves are vertically connected to the flow divider, and the flow divider is horizontally installed.
According to another aspect of the present invention, there is provided a flow distribution control method of a flow distribution assembly, including
The first temperature sensing bulb measures and calculates the pressure in a pipeline between the first electronic expansion valve and the second electronic expansion valve;
the pressure in a pipeline where the second electronic expansion valve is communicated with the indoor unit is measured and calculated by the second temperature sensing bulb;
calculating the ratio of the pressure measured by the first bulb to the pressure measured by the second bulb, and comparing the ratio with a set value: and if the ratio is smaller than the set value, adjusting the opening degree of the first electronic expansion valve or/and adjusting the opening degree of the second electronic expansion valve until the ratio is larger than or equal to the set value.
Preferably, the set value is 1.66.
Preferably, the set value is greater than 1.9.
Preferably, the adjusting the opening degree of the first electronic expansion valve includes: adjusting the set opening degree in each set time period, and maintaining the operation for the set time at the opening degree.
Preferably, the adjusting the opening degree of the first electronic expansion valve includes: the step of opening is increased by 10 to 50 steps every 1 to 5 minutes, and the operation is maintained for 5 to 20 minutes under the opening.
Preferably, the adjusting the opening degree of the second electronic expansion valve includes: adjusting the set opening degree in each set time period, and maintaining the operation for the set time at the opening degree.
Preferably, the adjusting the opening degree of the second electronic expansion valve includes: closing the valve for 10/N-50/N steps every 1-5 minutes, and keeping the operation for 5-20 minutes under the opening degree; n is the number of the opened indoor units.
According to still another aspect of the present invention, there is provided a multi-connected air conditioner including the flow dividing assembly as described above.
The invention provides a flow distribution assembly, which comprises a first electronic expansion valve, a flow divider, a plurality of second electronic expansion valves, a first temperature sensing bulb and a plurality of second temperature sensing bulbs, wherein the first electronic expansion valve, the flow divider and the plurality of second electronic expansion valves are sequentially connected; the first temperature sensing bulb is arranged on a pipeline between the first electronic expansion valve and the flow divider, and one second temperature sensing bulb is arranged on a pipeline of each second electronic expansion valve correspondingly communicated with one indoor unit. The opening degree of the first electronic expansion valve and/or the second electronic expansion valve is regulated and controlled, so that the pressure ratio before and after the second electronic expansion valve is larger than or equal to a set value, and the purpose of achieving shunting control meeting the use requirements of each evaporator is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a shunt assembly according to an embodiment of the present invention.
The reference numerals are represented as:
1. a condenser; 2. a first electronic expansion valve; 3. a flash evaporator; 4. a flow divider; 41. a first bulb; 5. a second electronic expansion valve; 51. a second thermal bulb.
Detailed Description
Referring to fig. 1 in combination, according to an embodiment of the present invention, a flow splitting assembly includes a first electronic expansion valve 2, a flow splitter 4, a plurality of second electronic expansion valves 5, a first bulb 41, and a plurality of second bulbs 51; the first thermal bulb 41 is arranged on a pipeline between the first electronic expansion valve 2 and the flow divider 4, and one second thermal bulb 51 is arranged on a pipeline of each second electronic expansion valve 5 correspondingly communicated with one indoor unit.
The temperature sensing bags are arranged on the front flow path and the rear flow path of the flow divider 4 of the two-stage compression multi-connected heat pump unit, the temperature of fluid on the flow paths can be sensed by the temperature sensing bags, the temperature information is converted into the pressure information, and the pressure ratio converted by the first temperature sensing bag 41 and the second temperature sensing bag 51 is higher than a set value by regulating the opening degree of the first electronic expansion valve 2 and/or the second electronic expansion valve 5; because each pipeline communicated with each indoor unit is provided with a corresponding second temperature sensing bulb 51, the regulation and control process can ensure that the required refrigerant quantity of each indoor unit conforms to the running state of the evaporator. Alternatively, the opening degrees of the first electronic expansion valve 2 and the second electronic expansion valve 5 may be controlled according to the pressure ratio measured by the first bulb 41 and the second bulb 51.
If the invention adopts two-stage compression and further comprises a flash evaporator 3, the splitter 4 is arranged at the downstream of the flash evaporator 3, compared with single-stage compression, the pressure of the splitter 4 before splitting is smaller, and the splitting operation is very unfavorable. However, the temperature sensing bulbs are arranged in front of and behind the flow divider 4, so that pressure change can be monitored accurately, the opening degree of the electronic expansion valve can be regulated and controlled conveniently, and each evaporator can meet respective use requirements.
In practical application, in order to improve the flow dividing effect and ensure that the use requirements of each evaporator are met, the second electronic expansion valve 5 is vertically connected to the flow divider 4, and the flow divider 4 is horizontally arranged.
For the shunt assembly, the shunt control method comprises the following steps
The first bulb 41 measures and calculates the pressure in the pipeline between the first electronic expansion valve 2 and the second electronic expansion valve 5;
the second temperature sensing bulb 51 measures and calculates the pressure in the pipeline where the second electronic expansion valve 5 is located and the indoor unit is communicated;
calculating the ratio of the pressure measured by the first temperature sensing bulb 41 to the pressure measured by the second temperature sensing bulb 51, and comparing the ratio with a set value: if the ratio is smaller than the set value, the opening degree of the first electronic expansion valve 2 is increased, or/and the opening degree of the second electronic expansion valve 5 is decreased until the ratio is larger than or equal to the set value.
The opening degree of the first electronic expansion valve 2 and/or the second electronic expansion valve 5 is regulated and controlled according to the ratio of the two pressure values measured by the first temperature sensing bulb 41 and the second temperature sensing bulb 51, and the pressure ratio is compared with a set value to enable the pressure ratio to be larger than or equal to the set value; the setpoint is 1.66, preferably the setpoint is greater than 1.9.
If the pressure ratio is smaller than the set value, the opening degree of the first electronic expansion valve 2 is adjusted, or/and the opening degree of the second electronic expansion valve 5 is adjusted until the ratio is larger than or equal to the set value. Preferably, the opening degree of the first electronic expansion valve 2 is appropriately increased, or the opening degree of the second electronic expansion valve 5 is appropriately decreased so that the ratio is not less than the set value.
In a specific operation, the step of increasing the opening degree of the first electronic expansion valve 2 includes: and (3) increasing the set opening degree within each set time period, and maintaining the operation for a set time under the opening degree, for example, increasing the opening degree by 10-50 steps every 1-5 minutes, and maintaining the operation for 5-20 minutes under the opening degree. Or
The step of reducing the opening degree of the second electronic expansion valve 5 includes: reducing the set opening degree within each set time period, and maintaining the operation for a set time under the opening degree, wherein if the step is reduced by 10/N-50/N every 1-5 minutes, the operation is maintained for 5-20 minutes under the opening degree; n is the number of the opened indoor units.
The opening degree of the first electronic expansion valve 2 can be increased and the opening degree of the second electronic expansion valve 5 can be decreased simultaneously, so that the pressure ratio is not less than the set value.
The above set value is 1.66, i.e. the pressure ratio must reach above 1.66 (this is an empirical value); preferably, the set value is greater than 1.9.
As shown in fig. 1, the refrigerant from the condenser 1 is reduced in pressure to an intermediate pressure by the first electronic expansion valve 2, and the intermediate pressure bulb collects the pressure (Y)Intermediate (II)) Then, the pressure is reduced to the evaporation pressure of each indoor unit through the adjustment of the electronic expansion valve of each corresponding indoor unit, and the second thermal bulb 51 correspondingly collects the maximum value (Y) of the pressureIs steamed into). When the heat pump set is in stable operation, the pressure ratio (Y)Intermediate (II)/YIs steamed into) When the opening degree of the first electronic expansion valve 2 is smaller (smaller than 1.66), the opening degree is preferably adjusted to be larger by 30 steps every 3 minutes, then the opening degree is maintained for 10 minutes, and adjustment is performed according to an actual target value; meanwhile, it is also preferable to appropriately decrease the electronic expansion valves of the corresponding indoor units, for example, the electronic expansion valves are adjusted in steps of closing 30/N (N is the number of the opened indoor units) every 3 minutes, and then the electronic expansion valves are operated for 10 minutes while maintaining the opening value, and the electronic expansion valves are adjusted according to the actual target value. By expansion of electronsThe expansion valve is adjusted to ensure that the front-back pressure ratio (Y) of the electronic expansion valve (refrigeration second stage) corresponding to each internal machineIntermediate (II)/YIs steamed into) Reaching more than 1.66 times.
The number of electronic expansion valves used is not limited to the number shown in fig. 1, and depends on the number of internal machines to be used. Fig. 1 shows that the three indoor units are freely matched, and when the three indoor units work, the three second electronic expansion valves 5 are all adjusted according to requirements (when the indoor unit of the air conditioner works, the corresponding second electronic expansion valve 5 is adjusted).
In another embodiment of the present invention, a multi-connected air conditioner includes the above-mentioned flow dividing assembly and a corresponding control method.
Before the split-flow control method is applied to the multi-connected air conditioner, under some working conditions, such as (32 ℃/23 ℃, 54 ℃ /), (21 ℃/15 ℃, 18 ℃ /), (27 ℃/24 ℃, 27 ℃ /), at least the following problems occur in the experimental process:
1. when in refrigeration operation, the outlet pipe temperature of each internal machine evaporator has larger difference.
2. When in refrigeration operation, the electronic expansion valve corresponding to each internal machine has a large difference in control steps.
3. The indoor units of the same type are simultaneously started, and sometimes the air outlet temperature and the air outlet capacity have larger difference under the same condition.
The problems are solved by adopting the shunt control method.
It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.
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. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The flow dividing control method of the flow dividing assembly is characterized in that the flow dividing assembly comprises a first electronic expansion valve (2), a flow divider (4) and a plurality of second electronic expansion valves (5) which are sequentially connected, and is characterized by further comprising a first temperature sensing bulb (41) and a plurality of second temperature sensing bulbs (51); the first temperature sensing bulb (41) is arranged on a pipeline between the first electronic expansion valve (2) and the flow divider (4), and one second temperature sensing bulb (51) is arranged on a pipeline of each second electronic expansion valve (5) correspondingly communicated with one indoor unit;
the shunting control method comprises the following steps:
a first temperature sensing bulb (41) measures and calculates the pressure in a pipeline between the first electronic expansion valve (2) and the second electronic expansion valve (5);
the second temperature sensing bulb (51) measures and calculates the pressure in a pipeline where the second electronic expansion valve (5) is positioned and the indoor unit is communicated;
calculating the ratio of the pressure measured by the first bulb (41) to the pressure measured by the second bulb (51), and comparing the ratio with a set value: if the ratio is smaller than the set value, the opening degree of the first electronic expansion valve (2) is adjusted, or/and the opening degree of the second electronic expansion valve (5) is adjusted until the ratio is larger than or equal to the set value.
2. The split control method according to claim 1, wherein the set value is 1.66.
3. The split control method according to claim 1, wherein the set value is greater than 1.9.
4. The split control method according to claim 1, wherein the step of adjusting the opening degree of the first electronic expansion valve (2) comprises: adjusting the set opening degree in each set time period, and maintaining the operation for the set time at the opening degree.
5. The split control method according to claim 4, wherein the step of adjusting the opening degree of the first electronic expansion valve (2) comprises: adjusting for 10-50 steps every 1-5 minutes, and keeping running for 5-20 minutes under the opening degree.
6. The split control method according to claim 1, wherein the step of adjusting the opening degree of the second electronic expansion valve (5) comprises: adjusting the set opening degree in each set time period, and maintaining the operation for the set time at the opening degree.
7. The split control method according to claim 6, wherein the step of adjusting the opening degree of the second electronic expansion valve (5) comprises: adjusting 10/N-50/N steps every 1-5 minutes, and keeping running for 5-20 minutes under the opening degree; n is the number of the opened indoor units.
8. A multi-connected air conditioner comprising a flow dividing assembly operating according to the flow dividing control method of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910589717.7A CN110296554B (en) | 2019-07-02 | 2019-07-02 | Shunting assembly, shunting control method thereof and multi-connected air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910589717.7A CN110296554B (en) | 2019-07-02 | 2019-07-02 | Shunting assembly, shunting control method thereof and multi-connected air conditioner |
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| CN110296554A CN110296554A (en) | 2019-10-01 |
| CN110296554B true CN110296554B (en) | 2020-08-25 |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4571019B2 (en) * | 2005-06-14 | 2010-10-27 | ダイキン工業株式会社 | Refrigerant shunt |
| WO2012111063A1 (en) * | 2011-02-14 | 2012-08-23 | 三菱電機株式会社 | Refrigeration cycle device and refrigeration cycle control method |
| JP5696069B2 (en) * | 2012-02-29 | 2015-04-08 | 日立アプライアンス株式会社 | Refrigeration cycle equipment |
| US10168068B2 (en) * | 2013-03-12 | 2019-01-01 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| JP6028817B2 (en) * | 2015-01-30 | 2016-11-24 | ダイキン工業株式会社 | Air conditioner |
| CN104833126A (en) * | 2015-03-31 | 2015-08-12 | 广东美的暖通设备有限公司 | Variable refrigerant volume system |
| CN104748425B (en) * | 2015-03-31 | 2017-03-08 | 广东美的暖通设备有限公司 | The off-premises station assembly of multiple on-line system and multiple on-line system |
| CN104748239B (en) * | 2015-03-31 | 2017-10-31 | 广东美的暖通设备有限公司 | Multiple on-line system |
| JP6123878B1 (en) * | 2015-12-22 | 2017-05-10 | ダイキン工業株式会社 | Air conditioner |
| JP2017142039A (en) * | 2016-02-12 | 2017-08-17 | 三菱重工サーマルシステムズ株式会社 | Air conditioner |
| JP6278094B1 (en) * | 2016-10-28 | 2018-02-14 | ダイキン工業株式会社 | Air conditioner |
| CN108469130A (en) * | 2018-05-30 | 2018-08-31 | 佛山市浦路威电器设备有限公司 | Multi-functional multi-gang air conditioner |
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