CN211146679U - Multi-split indoor unit and multi-split system - Google Patents
Multi-split indoor unit and multi-split system Download PDFInfo
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- CN211146679U CN211146679U CN201922272815.6U CN201922272815U CN211146679U CN 211146679 U CN211146679 U CN 211146679U CN 201922272815 U CN201922272815 U CN 201922272815U CN 211146679 U CN211146679 U CN 211146679U
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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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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The application provides a multi-split indoor unit and a multi-split system, and belongs to the technical field of air conditioners. The multi-connected system comprises an outdoor unit, an inner and outer connecting pipe, a branch pipe and a plurality of multi-connected indoor units, wherein the outdoor unit is connected with the plurality of multi-connected indoor units through the inner and outer connecting pipe and the branch pipe. The air conditioner comprises an indoor unit body, a refrigerant conveying pipe, a first electronic expansion valve, a second electronic expansion valve and a pressure sensor, wherein the refrigerant conveying pipe comprises a first end and a second end, the first end is used for being connected with a branch pipe, and the second end is connected with the indoor unit body; the first electronic expansion valve and the pressure sensor are both arranged on the refrigerant conveying pipe, and the second electronic expansion valve is arranged in the indoor unit body. The design results in a multi-split system which enables different expansion valves in different working modes. Therefore, the opening degree of the corresponding expansion valve can be adjusted according to the feedback of the refrigerant pressure of different internal machines, and the refrigerant distribution is more uniform.
Description
Technical Field
The utility model relates to an air conditioning technology field particularly, relates to an online indoor unit of ally oneself with and ally oneself with online system more.
Background
At present, when the refrigerant conveying pipe is lengthened when the multi-connected indoor unit is installed, a corresponding control mode is provided at present to compensate the pressure loss caused by the increase of the refrigerant conveying pipe, but the split flow caused by the difference of the indoor unit pressure due to the uneven length of the installation refrigerant conveying pipe is uneven, and the adjustment can only be realized by depending on an electronic expansion valve of the indoor unit. However, the opening degree of the internal electronic expansion valve is limited, and the expected effect is often difficult to achieve by the internal electronic expansion valve alone.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a many online indoor units and many online systems, it can improve the uneven problem of refrigerant reposition of redundant personnel of different indoor units.
A multi-connected indoor unit comprises an indoor unit body, a refrigerant conveying pipe, a first electronic expansion valve, a second electronic expansion valve and a pressure sensor, wherein the refrigerant conveying pipe comprises a first end and a second end, the first end is used for being connected with a branch pipe, and the second end is connected with the indoor unit body; the first electronic expansion valve and the pressure sensor are both arranged on the refrigerant conveying pipe, and the second electronic expansion valve is arranged in the indoor unit body.
After the multi-split air conditioner adopts the multi-split air conditioner indoor unit, the first expansion valve plays a throttling role in a refrigerating mode, and the second expansion valve plays a throttling role in a heating mode, so that refrigerant distribution in different modes is uniform.
Further, the first electronic expansion valve is arranged close to the first end of the refrigerant conveying pipe.
In the cooling mode, the refrigerant flows from the first end to the second end of the refrigerant conveying pipe. The first expansion valve is disposed at a position near the first end, which enables the flow rate to be adjusted at the source by adjusting the opening degree. Because the length of the refrigerant conveying pipe of each multi-connected indoor unit is different, the pressure loss of the pipeline is different; if the first expansion valve is positioned near the second end, it results in a reduced flow equalization effect in the cooling mode.
Further, the pressure sensor is arranged close to the second end of the refrigerant conveying pipe.
In the heating mode, the refrigerant flows from the second end to the first end of the refrigerant conveying pipe. The first expansion valve is disposed at a position near the second end, which enables the flow rate to be adjusted at the source by the adjustment of the opening degree. Because the length of the refrigerant conveying pipe of each multi-connected indoor unit is different, the pressure loss of the pipeline is different; if the first expansion valve is arranged close to the second end, it results in a reduced flow equalization effect in heating mode.
Further, the maximum flow rate of the first electronic expansion valve is equal to the maximum flow rate of the second electronic expansion valve (0.8-1.2).
The design can save resources as much as possible under the condition of not influencing conventional refrigeration and heating. If the flow of the first electronic expansion valve is too large, the waste cost of resources is inevitably increased; if the flow rate is too small, it may affect conventional cooling and heating.
The multi-online system comprises an outdoor unit, a branch pipe and the multi-online indoor units, wherein the branch pipe comprises a main pipe and a plurality of branch pipes, the outdoor unit is connected with the main pipe, and the branch pipes are respectively connected with the multi-online indoor units.
After the multi-online indoor unit is adopted, the opening degrees of the first expansion valve and the second expansion valve are correspondingly adjusted according to the pressure of the refrigerant conveying pipe of each multi-online indoor unit, so that the refrigerant can be distributed more uniformly among different indoor units.
The controller is respectively in communication connection with the first electronic expansion valves, the second electronic expansion valves and the pressure sensors on the branch pipes;
the controller can obtain signals of the pressure sensors and obtain a pressure mean value, and can adjust the opening degree of the first electronic expansion valve or/and the second electronic expansion valve on the corresponding branch pipe according to the size relation between the pressure value on each branch pipe and the pressure mean value.
The design enables the adjustment of the refrigerant to be more automatic, and the flow equalizing effect is further improved.
Further, the lengths of the first electronic expansion valves on the branch pipes from the main pipe to the joint of the main pipe and the branch pipes are equal.
The design enables the same opening degree of the first electronic expansion valves on different branch pipes to correspond to the same flow and pressure loss, thereby being beneficial to improving the flow equalizing effect.
Further, the pipe lengths between the pressure sensors on the plurality of branch pipes and the second electronic expansion valve are equal.
The design enables the pressure measured by the pressure sensors on different branches to be more accurate.
The beneficial effects of the technical scheme that this application provided include:
according to the multi-online indoor unit and the multi-online system obtained through the design, the first expansion valve plays a role in throttling in a refrigeration mode, and the second expansion valve plays a role in throttling in a heating mode; i.e. different expansion valves are activated in different operating modes. Therefore, the opening degree of the corresponding expansion valve can be adjusted according to the feedback of the refrigerant pressure of different internal machines, and the refrigerant distribution is more uniform.
Drawings
Fig. 1 is a schematic flow diagram of a refrigerant of a multi-split system in a refrigeration mode;
fig. 2 is a schematic flow diagram of refrigerant of a multi-split air-conditioning system in a heating mode.
Icon: 1-indoor machine body; 2-refrigerant conveying pipe; 3-a first electronic expansion valve; 4-a second electronic expansion valve; 5-a manifold; 6-inner and outer connecting pipe.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and 2, the present embodiment provides a multi-online system, which includes an outdoor unit, an inner and outer connecting pipe 6, a branch pipe 5, and a plurality of multi-online indoor units, wherein the outdoor unit is connected to the plurality of multi-online indoor units through the inner and outer connecting pipe 6 and the branch pipe 5. The multi-connected indoor unit comprises a refrigerant conveying pipe 2 and an indoor unit body 1; the branch pipe 5 comprises a main pipe and a plurality of branch pipes, the main pipe is connected with the inner and outer connecting pipes 6, and the plurality of branch pipes are respectively connected with the plurality of refrigerant conveying pipes 2.
The multi-connected indoor unit further comprises a first electronic expansion valve 3, a second electronic expansion valve 4 and a pressure sensor; the first electronic expansion valve 3 is arranged on the refrigerant conveying pipe 2, and the second electronic expansion valve 4 is arranged in the indoor unit body 1.
For convenience of description, both ends of the refrigerant conveying pipe 2 are named as a first end and a second end, wherein the first end is connected with the branch pipe of the branch pipe 5, and the second end is connected with the indoor unit body 1. In this embodiment, the first electronic expansion valve 3 on each refrigerant conveying pipe 2 is disposed near the first end of the refrigerant conveying pipe 2, and the pressure sensor is disposed near the second end. The maximum flow rate of the first electronic expansion valve 3 is 1.2 times (in other embodiments, 0.8 times or 1 time) that of the second electronic expansion valve 4.
Further, the multi-split system further comprises a controller, and the controller is in communication connection with the first electronic expansion valve 3, the second electronic expansion valve 4 and the pressure sensor on the plurality of branch pipes respectively. The pressure sensor can transmit detection signals of the pressure sensor to the controller in real time, and the controller receives the signals and processes the signals and controls the first electronic expansion valve 3 and the second electronic expansion valve 4 according to processing results.
When the multi-split system is in a refrigeration mode, the first electronic expansion valve 3 on the refrigerant conveying pipe 2 plays a throttling role; the pressure sensors detect refrigerant pressures of the different indoor units (B1, B2, B3, taking 3 indoor units as an example), and calculate an average value B0.
Each internal machine pressure B (1, 2, 3) is compared with B0 (first electronic expansion valve 3a11, a21, a31 initial opening degree 500 steps); if B1 > B0, the opening degree of the first electronic expansion valve 3a11 is decreased by 2 steps (1 step/second), if B1 is equal to B0, the opening degree of the first electronic expansion valve 3a11 is not changed, if B1 is equal to B0, the opening degree of the first electronic expansion valve 3a11 is increased by 2 steps (1 step/second), if B2 > B0, the opening degree of the first electronic expansion valve 3a21 is decreased by 2 steps (1 step/second), if B2 is equal to B0, the opening degree of the first electronic expansion valve 3a21 is not changed, if B2 is equal to B0, the opening degree of the first electronic expansion valve 3a21 is increased by 2 steps (1 step/second), if B3 is equal to B0, the opening degree of the first electronic expansion valve 3a31 is decreased by 2 steps (1 step/second), if B3 is equal to B0, the opening degree of the first electronic expansion valve 3a31 is not changed, if B3 < B0, the opening degree of the first electronic expansion valve 3a 373 a31 is increased.
After adjustment, the operation is stably performed for 3min, the internal machine pressures B (1, 2, 3) and B0 are compared, and the opening degrees of the electronic expansion valves a11, a21 and a31 are adjusted again until B1 is equal to B2 and B3, and the opening degree control of the first electronic expansion valves 3a11, a21 and a31 is stopped.
Heating mode: (the electronic expansion valve a0 has throttling function, and the opening degrees of the electronic expansion valves a11, a21 and a31 are fully opened), the pressure sensors detect different internal refrigerant outlet pressures (B1, B2 and B3, taking 3 internal machines as an example), and an average value B0 is calculated.
Comparing the internal machine pressures B (1, 2 and 3) with B0 (300 steps for the initial opening degrees of the electronic expansion valves A12, A22 and A32); if B1 > B0, the opening degree of the electronic expansion valve a12 is decreased by 2 steps (1 step/second), if B1 is equal to B0, the opening degree of the electronic expansion valve a12 is unchanged, if B1 < B0, the opening degree of the electronic expansion valve a12 is increased by 2 steps (1 step/second), if B2 > B0, the opening degree of the electronic expansion valve a22 is decreased by 2 steps (1 step/second), if B2 is equal to B0, the opening degree of the electronic expansion valve a22 is unchanged, if B2 < B0, the opening degree of the electronic expansion valve a22 is increased by 2 steps (1 step/second), if B3 > B3, the opening degree of the electronic expansion valve A3 is decreased by 2 steps (1 step/second), if B3 is equal to B3, the opening degree of the electronic expansion valve A3 is unchanged, if B3 < B3, the opening degree of the electronic expansion valve A3 is increased by 2 steps.
After the adjustment, the operation was stably performed for 3min, the indoor unit pressures B (1, 2, 3) and B0 were compared, the opening degrees of the electronic expansion valves a21, a22, and a32 were adjusted again, and the opening degree control of the electronic expansion valves a21, a22, and a32 was stopped until B1 becomes B2 or B3.
The multi-split system provided by the embodiment has the following beneficial effects: because the first expansion valve and the second expansion valve are arranged, different expansion valves are started under different working modes; therefore, the opening degree of the corresponding expansion valve can be adjusted according to the feedback of the refrigerant pressure of different internal machines, and the refrigerant distribution is more uniform.
Although the present invention is disclosed above, the present invention is not limited thereto. Various modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications are intended to be within the scope of the invention.
Claims (8)
1. The multi-connected indoor unit is characterized by comprising an indoor unit body, a refrigerant conveying pipe, a first electronic expansion valve, a second electronic expansion valve and a pressure sensor, wherein the refrigerant conveying pipe comprises a first end and a second end, the first end is used for being connected with a branch pipe, and the second end is connected with the indoor unit body; the first electronic expansion valve and the pressure sensor are both arranged on the refrigerant conveying pipe, and the second electronic expansion valve is arranged in the indoor unit body.
2. A multi-indoor unit according to claim 1, wherein the first electronic expansion valve is disposed near the first end of the refrigerant delivery pipe.
3. A multi-indoor unit according to claim 1 or 2, wherein the pressure sensor is provided near the second end of the refrigerant delivery pipe.
4. An indoor multi-split unit according to claim 1, wherein the maximum flow rate of the first electronic expansion valve is the maximum flow rate of the second electronic expansion valve (0.8-1.2).
5. A multi-online system, characterized by comprising an outdoor unit, a branch pipe and a plurality of multi-online indoor units as claimed in any one of claims 1 to 4, wherein the branch pipe comprises a main pipe and a plurality of branch pipes, the outdoor unit is connected with the main pipe, and the branch pipes are respectively connected with the plurality of multi-online indoor units.
6. The multi-split system as claimed in claim 5, further comprising a controller in communication with the first electronic expansion valve, the second electronic expansion valve and the pressure sensor on the plurality of branch pipes, respectively;
the controller can obtain signals of the pressure sensors and obtain a pressure mean value, and can adjust the opening degree of the first electronic expansion valve or/and the second electronic expansion valve on the corresponding branch pipe according to the size relation between the pressure value on each branch pipe and the pressure mean value.
7. The multi-split system as claimed in claim 5, wherein the lengths of the first electronic expansion valves of the plurality of branch pipes from the connection of the main pipe and the branch pipes are equal.
8. A multi-split system as claimed in claim 5, wherein the tube lengths between the pressure sensors on the branch tubes and the second electronic expansion valve are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922272815.6U CN211146679U (en) | 2019-12-17 | 2019-12-17 | Multi-split indoor unit and multi-split system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922272815.6U CN211146679U (en) | 2019-12-17 | 2019-12-17 | Multi-split indoor unit and multi-split system |
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| CN211146679U true CN211146679U (en) | 2020-07-31 |
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| CN201922272815.6U Active CN211146679U (en) | 2019-12-17 | 2019-12-17 | Multi-split indoor unit and multi-split system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593516A (en) * | 2022-01-26 | 2022-06-07 | 青岛海尔空调器有限总公司 | Method and device for adjusting air conditioner refrigerant, air conditioner and storage medium |
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2019
- 2019-12-17 CN CN201922272815.6U patent/CN211146679U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593516A (en) * | 2022-01-26 | 2022-06-07 | 青岛海尔空调器有限总公司 | Method and device for adjusting air conditioner refrigerant, air conditioner and storage medium |
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