CN216114828U - Outdoor side heat exchange mechanism of large capacity air conditioner - Google Patents
Outdoor side heat exchange mechanism of large capacity air conditioner Download PDFInfo
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- CN216114828U CN216114828U CN202122622872.XU CN202122622872U CN216114828U CN 216114828 U CN216114828 U CN 216114828U CN 202122622872 U CN202122622872 U CN 202122622872U CN 216114828 U CN216114828 U CN 216114828U
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Abstract
An outdoor heat exchange mechanism of a large-capacity air conditioner comprises a defrosting and deicing pipeline; the defrosting and deicing pipeline is connected with the gas-liquid separator through a branch which flows out after the secondary supercooling pipeline flows through the subcooler again and sequentially flows through the electronic expansion valve, the filter, the outdoor heat exchanger and the defrosting and deicing valve; the pressure relief parallel unit is connected with the outdoor heat exchanger in parallel, and a pressure control valve is arranged on the high-capacity pressure relief branch. The utility model aims at the defrosting and deicing design of the outdoor unit of the large-capacity air conditioning system, and the refrigerant flowing through the defrosting and deicing pipeline is decompressed through the large-capacity decompression branch, so that the influence on the heat exchange performance caused by local airflow disturbance and overlarge pressure fluctuation due to overlarge temperature difference is avoided, and the problem of uneven heat exchange of two-phase flow is effectively solved.
Description
Technical Field
The utility model relates to the field of defrosting and deicing of an outdoor unit of a large-capacity air conditioner, in particular to an outdoor side heat exchange mechanism of the large-capacity air conditioner.
Background
In the existing defrosting and deicing modes, the forward circulating defrosting and deicing technology is widely applied, particularly in northern areas, the outdoor environment is severe, and the phenomenon of icing of a heat exchanger is easily caused. When the whole machine is defrosted and deiced in the forward circulating deicing process, the heating is maintained and the direction is not changed, so that the stable heating of customers is ensured. However, in the prior art, branch control is independently arranged on a high-temperature refrigerant at an exhaust port of a compressor or an outlet of an oil equalizer, and the high-temperature refrigerant is guided into an outdoor heat exchanger for defrosting and deicing. According to the scheme, customers can enjoy the quality, but in the defrosting and deicing stages, the effective circulation volume of the system refrigerant is reduced due to the fact that the refrigerant of the main path is consumed, outdoor heat absorption capacity is low, heating capacity of the customer side is affected, the unit can continuously control the frequency of the compressor through self regulation, and therefore power consumption is increased.
At present, due to the problems of refrigerant capacity and pressure of a large-capacity air conditioning system, local airflow disturbance and overlarge pressure fluctuation caused by overlarge temperature difference affect the heat exchange performance, and the phenomenon of uneven two-phase flow heat exchange is caused by the existing defrosting and deicing design aiming at an outdoor unit of the large-capacity air conditioning system in the market.
SUMMERY OF THE UTILITY MODEL
The utility model provides an outdoor side heat exchange mechanism of a large-capacity air conditioner, aiming at the problems that the defrosting and deicing of the large-capacity air conditioning system cause local airflow disturbance and influence on heat exchange performance due to overlarge temperature difference and overlarge pressure fluctuation.
In order to achieve the purpose, the utility model adopts the following technical scheme: an outdoor heat exchange mechanism of a large-capacity air conditioner comprises a subcooler and an outdoor heat exchanger which are arranged on a circulating heating pipeline of a large-capacity air conditioning system, and a secondary subcooling pipeline which is formed by a branch of the circulating heating pipeline after flowing through the subcooler, a subcooling electronic expansion valve and a gas-liquid separator which are connected with each other after flowing through the subcooler, wherein the outdoor heat exchange mechanism also comprises a defrosting and deicing pipeline;
the defrosting and deicing pipeline is connected with the gas-liquid separator through a branch which flows out after the secondary supercooling pipeline flows through the subcooler again and sequentially flows through the electronic expansion valve, the filter, the outdoor heat exchanger and the defrosting and deicing valve;
the pressure relief parallel unit is connected with the outdoor heat exchanger in parallel, and a pressure control valve is arranged on the high-capacity pressure relief branch.
Preferably, the defrosting and deicing pipeline is further provided with a solenoid valve for controlling the secondary supercooling pipeline, and the solenoid valve is positioned between the electronic expansion valve and the defrosting and deicing valve.
Preferably, the defrosting and deicing pipeline flows through the outdoor heat exchanger from bottom to top along a flow channel of the outdoor heat exchanger.
Preferably, the outdoor heat exchanger is provided with a defrosting thermal bulb for acquiring frost or ice layer thickness.
Preferably, the circulating heating pipeline is connected with the outdoor heat exchanger through the subcooler, the heating electronic expansion valve and the heating filter in sequence, and flows out through the outdoor heat exchanger to be connected to a main refrigerant pipeline of the air conditioning system, wherein a branch is further arranged at the outflow end of the heating electronic expansion valve and is connected to the inflow end of the heating electronic expansion valve through a one-way valve.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model aims at the outdoor unit defrosting and deicing design of a large-capacity air conditioning system, the refrigerant flowing through the defrosting and deicing pipeline is decompressed through the large-capacity decompression branch, and the refrigerant of the defrosting and deicing pipeline is effectively regulated and throttled through the electronic expansion valve, so that the influence on the heat exchange performance caused by local airflow disturbance and overlarge pressure fluctuation due to overlarge temperature difference is avoided, and the problem of uneven heat exchange of two-phase flow is effectively solved.
Drawings
In order to more clearly illustrate the technical solution, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partial structural schematic diagram of fig. 1.
Detailed Description
For a clear and complete understanding of the technical solutions, the present invention will now be further described with reference to the embodiments and the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
As shown in fig. 1 and 2, an outdoor heat exchange mechanism of a large-capacity air conditioner includes a subcooler 100 and an outdoor heat exchanger 200 disposed on a circulating heating pipeline of the large-capacity air conditioning system, and a secondary subcooling pipeline 500 formed by connecting a branch of the circulating heating pipeline passing through the subcooler 100, a sub-cooling electronic expansion valve 300, and the subcooler 100, with a gas-liquid separator 400, wherein the circulating heating pipeline passes through the subcooler 100, a heating electronic expansion valve 600, and a heating filter 700 in sequence, is connected with the outdoor heat exchanger 200, and flows out through the outdoor heat exchanger 200 to access a main refrigerant pipeline of the air conditioning system, and an outflow end of the heating electronic expansion valve 600 further includes a branch that is connected to an inflow end of the heating electronic expansion valve through a one-way valve. When the large-capacity air conditioning system is in heating operation, high-temperature and high-pressure refrigerant discharged by the compressor 800 enters the circulating heating pipeline through the oil-liquid separator and the oil equalizer, and the secondary supercooling pipeline 500 configured on the circulating heating pipeline is used for performing secondary supercooling on the refrigerant of the circulating heating pipeline through the subcooler so as to solve the problem of insufficient indoor side condensation.
The defrosting and deicing pipeline 900 is connected with the gas-liquid separator 400 through an electronic expansion valve 901, a filter 902, the outdoor heat exchanger 200 and a defrosting and deicing valve 903 in sequence by a branch of the secondary supercooling pipeline 500 flowing through the subcooler 100 again, and the defrosting and deicing pipeline 900 flows along a flow passage of the outdoor heat exchanger from bottom to top;
the front end of the outdoor heat exchanger 200 flowing through is also provided with a large-capacity pressure relief branch which is connected with the defrosting and deicing valve to form a pressure relief parallel unit which is connected with the outdoor heat exchanger in parallel, and the large-capacity pressure relief branch is provided with a pressure control valve 904.
The defrosting and deicing pipeline 900 is further provided with an electromagnetic valve 905 for controlling the secondary supercooling pipeline 500, and the electromagnetic valve is positioned between the electronic expansion valve and the defrosting and deicing valve; the outdoor heat exchanger has a defrosting bulb 201 for obtaining the thickness of the frost or ice layer.
When the embodiment is used for heating, in order to avoid loss waste caused by the fact that the secondary supercooling pipeline absorbs heat of the circulating heating pipeline and directly flows into the gas-liquid separator, the defrosting and deicing pipeline uses waste heat of the secondary supercooling pipeline for defrosting and deicing of the outdoor heat exchanger, so that the real-time temperature of the outdoor heat exchanger is obtained through the defrosting and deicing pipeline, and the defrosting and deicing pipeline is controlled to be started in cooperation with control analysis of an air conditioning system on indoor and outdoor heat exchange conditions.
When the system judges that defrosting and deicing are needed to be carried out on the outdoor heat exchanger, the electromagnetic valve for controlling the secondary supercooling pipeline is controlled to be closed, at the moment, the refrigerant for secondary heat exchange in the subcooler enters the outdoor heat exchanger through the electronic expansion valve and the filter, the refrigerant entering the outdoor heat exchanger reversely flows along the direction of the thickness of the ice layer from bottom to top along the flow channel, the defrosting and deicing period can be shortened due to large temperature difference heat exchange, the refrigerant passing through the outdoor heat exchanger flows to the gas-liquid separator through the secondary supercooling pipeline again, and is separated into gaseous refrigerants to enter the circulating heating pipeline.
When the system judges that the pressure of the defrosting and deicing pipeline is too large or the temperature difference between the freezing temperature of the outdoor heat exchanger and a refrigerant is too large, local airflow disturbance or too large pressure fluctuation is easily caused due to the too large temperature difference for heat exchange, and the pressure control valve of the large-capacity pressure relief branch is controlled to release pressure at the moment, so that the system pressure fluctuation is avoided and the heat exchange performance is prevented from being influenced.
The above disclosure is intended to be illustrative of one or more of the preferred embodiments of the present invention and is not intended to limit the utility model in any way, which is equivalent or conventional to one skilled in the art and which is intended to cover all modifications, equivalents, and alternatives falling within the scope of the utility model as defined by the appended claims.
Claims (5)
1. An outdoor heat exchange mechanism of a large-capacity air conditioner comprises a subcooler and an outdoor heat exchanger which are arranged on a circulating heating pipeline of a large-capacity air conditioning system, and a secondary subcooling pipeline which is formed by a branch of the circulating heating pipeline after flowing through the subcooler, a subcooling electronic expansion valve and a gas-liquid separator which are connected with each other after flowing through the subcooler, and is characterized by also comprising a defrosting and deicing pipeline;
the defrosting and deicing pipeline is connected with the gas-liquid separator through a branch which flows out after the secondary supercooling pipeline flows through the subcooler again and sequentially flows through the electronic expansion valve, the filter, the outdoor heat exchanger and the defrosting and deicing valve;
the pressure relief parallel unit is connected with the outdoor heat exchanger in parallel, and a pressure control valve is arranged on the high-capacity pressure relief branch.
2. An outdoor side heat exchanging mechanism of a large capacity air conditioner according to claim 1, wherein: the defrosting and deicing pipeline is also provided with an electromagnetic valve for controlling the secondary supercooling pipeline and is positioned between the electronic expansion valve and the defrosting and deicing valve.
3. An outdoor side heat exchanging mechanism of a large capacity air conditioner according to claim 1, wherein: the defrosting and deicing pipeline flows through the outdoor heat exchanger and flows along the flow channel of the outdoor heat exchanger from bottom to top.
4. An outdoor side heat exchanging mechanism of a large capacity air conditioner according to claim 1, wherein: the outdoor heat exchanger is provided with a defrosting thermal bulb for acquiring the thickness condition of a frost or ice layer.
5. An outdoor side heat exchanging mechanism of a large capacity air conditioner according to claim 1, wherein: the circulating heating pipeline is connected with the outdoor heat exchanger through the subcooler, the heating electronic expansion valve and the heating filter in sequence, flows out of the outdoor heat exchanger and is connected with a main refrigerant pipeline of the air conditioning system, wherein the outflow end of the heating electronic expansion valve is also provided with a branch which is connected with the inflow end of the heating electronic expansion valve through a one-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122622872.XU CN216114828U (en) | 2021-10-29 | 2021-10-29 | Outdoor side heat exchange mechanism of large capacity air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122622872.XU CN216114828U (en) | 2021-10-29 | 2021-10-29 | Outdoor side heat exchange mechanism of large capacity air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN216114828U true CN216114828U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122622872.XU Active CN216114828U (en) | 2021-10-29 | 2021-10-29 | Outdoor side heat exchange mechanism of large capacity air conditioner |
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| Country | Link |
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| CN (1) | CN216114828U (en) |
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2021
- 2021-10-29 CN CN202122622872.XU patent/CN216114828U/en active Active
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