CN219014671U - Condenser flow path structure with frost prevention function - Google Patents
Condenser flow path structure with frost prevention function Download PDFInfo
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- CN219014671U CN219014671U CN202320052431.7U CN202320052431U CN219014671U CN 219014671 U CN219014671 U CN 219014671U CN 202320052431 U CN202320052431 U CN 202320052431U CN 219014671 U CN219014671 U CN 219014671U
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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
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- 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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Abstract
The utility model provides a condenser flow path structure with an anti-frost function, which comprises a compressor, an indoor heat exchanger, an indoor expansion valve bypass check valve, an indoor electronic expansion valve, an outdoor heat exchanger, an outdoor electronic expansion valve and an outdoor expansion valve bypass check valve, wherein the indoor heat exchanger is connected with the indoor heat exchanger; the compressor is connected with the indoor side heat exchanger through a pipeline, and the indoor side heat exchanger is connected with the indoor control valve assembly through a pipeline; the indoor control valve assembly is connected with the outdoor control valve assembly through a pipeline, the outdoor control valve assembly is connected with the outdoor heat exchanger through a pipeline, and the outdoor heat exchanger is connected with the compressor through a pipeline. The condenser flow path structure with the frost prevention function is characterized in that the refrigerant in the frost prevention flow path is a medium-temperature medium-pressure refrigerant before throttling in heating, and the temperature is higher, so that the frost is not formed at the part which is easy to accumulate outside the condenser in heating, and the frost is not frozen.
Description
Technical Field
The utility model belongs to the technical field of central air conditioning equipment, and particularly relates to a condenser flow path structure with a frost prevention function.
Background
In the field of medical purification, particularly in places requiring a large fresh air ratio, all temperature and humidity loads of fresh air of an air conditioning system are often born by adopting an air-cooled direct expansion unit. Usually, the working conditions of the machine are all full fresh air working conditions, namely the environment working conditions of the evaporator and the condenser are consistent.
In general, in a cooling or heating mode, the temperature and humidity of the environment where the outdoor condenser is located are consistent with the temperature and humidity of the inlet air of the indoor evaporator. Often under the refrigeration operating mode, the unit operation is stable, and under the heating operating mode, because the air inlet humiture of evaporimeter and condenser is unanimous to it is less to cause system high low pressure differential. In particular, in the case of low ambient temperatures, the suction pressure of the air conditioning unit is constantly at a comparatively low pressure, which results in a low evaporation temperature.
The lower evaporation temperature directly leads to lower surface temperature of the finned tube of the air-cooled finned heat exchanger, so that moisture in the humid air is condensed on the surface of the finned tube, and the moisture is condensed into frost when the moisture is further lower than the freezing point. Therefore, the air-cooled direct expansion unit is often provided with an automatic defrosting function, and the frost severity degree is automatically judged through various parameters of the acquisition system, so that automatic defrosting is realized.
Often, the outdoor side condenser is of an upright structure, and when defrosting, the surface temperature of the fins is higher than the freezing point, so that the frost layer is melted into water, and the defrosting water vertically flows down along the fins. The water at the bottom of the fin type heat exchanger is obviously more than the water at the upper part, the water draining time of the bottom of the fin type heat exchanger is obviously shorter than the water at the upper part in the limited defrosting time, and even the water is switched into a heating mode without complete evaporation. The outdoor fin type heat exchanger of the heating mode is an evaporator, and water can directly cause icing due to the fact that the surface temperature of the evaporator is low. And the phenomenon that accumulated water is frozen and accumulated more and thicker is generated at the bottom of the fin type heat exchanger through reciprocating circulation, and finally, the unit is in fault.
Disclosure of Invention
In view of the above, the present utility model aims to provide a condenser flow path structure with frost prevention function, which has a simple structure and is convenient to use.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a condenser flow path structure with frost prevention function comprises a compressor, an indoor side heat exchanger, an indoor side expansion valve bypass check valve, an indoor side electronic expansion valve, an outdoor side heat exchanger, an outdoor side electronic expansion valve and an outdoor side expansion valve bypass check valve;
the compressor is connected with the indoor side heat exchanger through a pipeline, and the indoor side heat exchanger is connected with the indoor control valve assembly through a pipeline;
the indoor control valve assembly is connected with the outdoor control valve assembly through a pipeline, the outdoor control valve assembly is connected with the outdoor heat exchanger through a pipeline, and the outdoor heat exchanger is connected with the compressor through a pipeline.
Further, the indoor control valve assembly comprises an indoor side expansion valve bypass check valve and an indoor side electronic expansion valve, and the indoor side expansion valve bypass check valve and the indoor side electronic expansion valve are connected in parallel through pipelines.
Further, the outdoor control valve assembly comprises an outdoor electronic expansion valve and an outdoor expansion valve bypass check valve, and the outdoor electronic expansion valve and the outdoor expansion valve bypass check valve are connected in parallel through pipelines;
further, an inlet side of the frost prevention loop is arranged on a pipeline between the indoor control valve assembly and the outdoor control valve assembly, the inlet side of the frost prevention loop is connected with an outlet side of the frost prevention loop through a pipeline, the inlet side of the frost prevention loop is connected with an outdoor heat exchanger through a pipeline, and the outdoor pipe heat exchanger is arranged on one side of the inlet side of the frost prevention loop and one side of the outlet side of the frost prevention loop.
Further, the outdoor heat exchanger comprises an outdoor side heat exchanger liquid distributor and an outdoor side heat exchanger gas collecting tube, and a plurality of outdoor side heat exchanger liquid distributors are connected with a plurality of outdoor side heat exchanger gas collecting tubes.
Further, the outdoor side heat exchanger liquid distributor and the outdoor side heat exchanger gas collecting tube are respectively connected with the inlet side of the frost prevention loop through pipelines.
Further, the outdoor side heat exchanger is a fin heat exchanger.
Compared with the prior art, the condenser flow path structure with the frost prevention function has the following beneficial effects:
1. the condenser flow path structure with the frost prevention function is characterized in that the refrigerant in the frost prevention flow path is a medium-temperature medium-pressure refrigerant before throttling in heating, and the temperature is high, so that the frost is not formed at the part, which is easy to accumulate frost, of the outer side of the condenser in heating, and the frost is not frozen.
2. The condenser flow path structure with the frost prevention function only occupies 6 pipelines at the outer side of the bottom of the air-cooled fin type heat exchanger, and the flow path can perform a preheating function on air flow flowing through, so that the fin tubes at the inner side are not easy to frost.
3. The frost prevention flow path of the double-electronic expansion valve can be used as a supercooling pipeline of a condenser during refrigeration, and can be used for deeply supercooling the condensed medium-temperature refrigerant, so that the refrigeration performance is effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic diagram of a condenser flow path structure with frost prevention function in a heating mode according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a condenser flow path structure with frost prevention function in a cooling mode according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a compressor; 2. an indoor side heat exchanger; 3. an indoor side expansion valve bypass check valve; 4. an indoor electronic expansion valve; 5. an inlet side of the anti-frost loop; 6. an outlet side of the frost prevention loop; 7. an outdoor electronic expansion valve; 8. an outdoor expansion valve bypass check valve; 9. an outdoor side heat exchanger knockout; 10. outdoor side heat exchanger gas collecting tube; 11. heating cycle indication arrow; 12. the refrigeration cycle indicates an arrow.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
A condenser flow path structure with frost prevention function comprises a compressor 1, an indoor side heat exchanger 2, an indoor side expansion valve bypass check valve 3, an indoor side electronic expansion valve 4, an outdoor side heat exchanger, an outdoor side electronic expansion valve 7 and an outdoor side expansion valve bypass check valve 8; the compressor 1 is connected with the indoor side heat exchanger 2 through a pipeline, and the indoor side heat exchanger 2 is connected with the indoor control valve assembly through a pipeline; the indoor control valve assembly is connected with the outdoor control valve assembly through a pipeline, the outdoor control valve assembly is connected with the outdoor heat exchanger through a pipeline, and the outdoor heat exchanger is connected with the compressor 1 through a pipeline. The indoor control valve assembly comprises an indoor expansion valve bypass check valve 3 and an indoor electronic expansion valve 4, and the indoor expansion valve bypass check valve 3 and the indoor electronic expansion valve 4 are connected in parallel through pipelines.
The outdoor control valve assembly comprises an outdoor electronic expansion valve 7 and an outdoor expansion valve bypass check valve 8, and the outdoor electronic expansion valve 7 and the outdoor expansion valve bypass check valve 8 are connected in parallel through pipelines; an anti-frost loop inlet side 5 is arranged on a pipeline between the indoor control valve assembly and the outdoor control valve assembly, the anti-frost loop inlet side 5 is connected with an anti-frost loop outlet side 6 through a pipeline, the anti-frost loop inlet side 5 is connected with an outdoor heat exchanger through a pipeline, and the outdoor pipe heat exchanger is arranged on one side of the anti-frost loop inlet side 5 and one side of the anti-frost loop outlet side 6. The outdoor heat exchanger comprises an outdoor side heat exchanger liquid distributor 9 and an outdoor side heat exchanger gas collecting tube 10, and a plurality of outdoor side heat exchanger liquid distributors 9 are connected with a plurality of outdoor side heat exchanger gas collecting tubes 10. The outdoor side heat exchanger liquid distributor 9 and the outdoor side heat exchanger gas collecting tube 10 are respectively connected with the inlet side 5 of the frost prevention loop through pipelines. The outdoor side heat exchanger is a fin heat exchanger.
As shown in fig. 1, in the condenser flow path structure having the frost prevention function, the indoor side electronic expansion valve 4 is in a closed state during the heating operation, and the refrigerant is completely bypassed by the indoor side expansion valve bypass check valve 3. Therefore, in the heating process, the outdoor electronic expansion valve 7 is really used for throttling. And an outdoor side expansion valve bypass check valve 8 connected in parallel with the outdoor side electronic expansion valve 7, wherein the opening flow direction of the bypass check valve is opposite to the flow direction of the heating refrigerant. Therefore, during the heating operation, the outdoor-side expansion valve bypass check valve 8 is always closed, and the refrigerant must flow through the outdoor-side electronic expansion valve 7.
As shown in fig. 1, in the condenser flow path structure having the frost prevention function, the indoor side heat exchanger 2 corresponds to a condenser in a refrigeration system during a heating operation, and the outdoor side heat exchanger 13 corresponds to an evaporator in the refrigeration system.
As shown in fig. 1, a condenser flow path structure with frost prevention function, the flow of refrigerant in heating operation is: the high-temperature high-pressure exhaust gas of the compressor 1 enters the indoor side heat exchanger 2, the refrigerant is condensed and releases heat in the indoor side heat exchanger 2 (condenser), passes through the indoor side expansion valve bypass check valve 3 and then enters the outdoor side frost prevention loop inlet side 5, at the moment, the refrigerant is converted into a medium-temperature medium-pressure state, flows out of the frost prevention loop outlet side 6 after flowing through 6 finned tubes, enters the outdoor side heat exchanger liquid separator 9 of the outdoor side heat exchanger after being throttled and depressurized by the outdoor side electronic expansion valve 7, flows out of the evaporator by the outdoor side heat exchanger gas collecting tube 10 after evaporating and absorbing heat of the evaporator, is converted into low-temperature low-pressure gaseous refrigerant, and finally returns to the air suction side of the compressor 1.
As shown in fig. 1, in a condenser flow path structure having an anti-frost function, the refrigerant entering the outdoor side anti-frost circuit inlet side 5 is in a medium temperature and medium pressure state, and is often lower than the condensation temperature, but is always at a freezing point of 0 ℃ or higher at the time of heating operation. Therefore, the outer sides of the 6 fin tubes are not frosted, and the icing phenomenon is avoided.
Because the outdoor side heat exchanger is generally vertically arranged, the surface temperature of the other finned tubes except the 6 finned tubes is often lower than 0 ℃ due to the evaporation effect of the refrigerant in the finned tubes during heating operation, and moisture in the air can gradually frost on the outer surfaces of the finned tubes. The general program can control the unit to perform defrosting operation, more defrosting water is often generated after defrosting, and flows down along the fins, so that the surface water of the fin tubes at the lower part is more, and particularly, the water flow can exit from the defrosting operation immediately when reaching the bottom and even running away. At this time, water which is not discharged in time is frozen, and the fin tube is seriously damaged.
In this embodiment, the higher surface temperature of the 6 fin tubes effectively ensures that the water at the bottom of the heat exchanger does not freeze, and once icing occurs, the intermediate-temperature refrigerant can effectively defrost.
As shown in FIG. 1, in a condenser flow path structure with frost prevention function, when 6 finned tubes positioned at the outer side of the bottom of an outdoor side heat exchanger 13 are heated and run, the surface temperature is always higher than 0 ℃ so as to ensure that the surface is not frosted, and meanwhile, the 6 finned tubes can preheat low-temperature air flowing on the surface, so that the evaporation effect of the finned tubes positioned at the rear side of the 6 finned tubes is effectively enhanced.
As shown in fig. 2, in the condenser flow path structure having the frost prevention function, the outdoor side electronic expansion valve 7 is in a closed state during the cooling operation, and the refrigerant is completely bypassed by the outdoor side expansion valve bypass check valve 8. Therefore, in the refrigerating process, the indoor electronic expansion valve 4 is really used for throttling. And the opening flow direction of the indoor side expansion valve bypass check valve 3 connected with the indoor side electronic expansion valve 3 in parallel is opposite to the flow direction of the refrigerating refrigerant. Therefore, during the cooling operation, the indoor-side expansion valve bypass check valve 3 is always closed, and the refrigerant must flow through the indoor-side electronic expansion valve 4.
As shown in fig. 2, in the condenser flow path structure having the frost prevention function, the outdoor side heat exchanger 13 corresponds to a condenser in a refrigeration system during a cooling operation, and the indoor side heat exchanger 4 corresponds to an evaporator in the refrigeration system.
As shown in fig. 2, a condenser flow path structure with frost prevention function, the flow of refrigerant during the cooling operation is: the high-temperature and high-pressure discharge gas of the compressor 1 enters the gas header 10 of the outdoor heat exchanger 13, and the refrigerant is condensed and discharged in the outdoor heat exchanger 13 (condenser), and then flows out through the liquid separator 9 of the outdoor heat exchanger 13. The outdoor expansion valve bypass check valve 8 is automatically opened, and the refrigerant enters the frost prevention loop outlet side 6 after passing through the outdoor expansion valve common check valve 8, and flows out from the frost prevention loop inlet side 5 after passing through the frost prevention loop.
Due to the unidirectional conduction characteristic of the indoor expansion valve bypass check valve 3, the refrigerant must be throttled and depressurized by the indoor expansion valve 4, then enters the indoor heat exchanger 2 (evaporator), and after being evaporated and absorbed by the evaporator, is converted into a low-temperature low-pressure gaseous refrigerant, and finally returns to the suction side of the compressor 1.
During the cooling operation, the frost protection circuit corresponds to the supercooling circuit of the condenser. The refrigerant is supercooled again by the frost prevention loop after being condensed by the outdoor side heat exchanger 13, so that the supercooling degree is effectively increased, and the refrigerating effect is remarkably improved.
The condenser flow path structure with the frost prevention function realizes the heating frost prevention function and the refrigerating supercooling function of the frost prevention loop through the combination and the coordinated use of a plurality of groups of electronic expansion valves and one-way valves. On one hand, the embodiment is simple and effective, particularly aims at the using working condition of the fresh air heating type, can effectively avoid the frosting problem of the finned tube, and ensures the reliability of the unit. On the other hand, the embodiment skillfully realizes the switching use of the double electronic expansion valves through the mechanical design of the one-way valve, and has good reference property in a direct evaporation type air conditioning system.
Claims (7)
1. A condenser flow path structure with frost prevention function, characterized in that: the device comprises a compressor (1), an indoor heat exchanger (2), an indoor expansion valve bypass check valve (3), an indoor electronic expansion valve (4), an outdoor heat exchanger, an outdoor electronic expansion valve (7) and an outdoor expansion valve bypass check valve (8);
the compressor (1) is connected with the indoor side heat exchanger (2) through a pipeline, and the indoor side heat exchanger (2) is connected with the indoor control valve assembly through a pipeline;
the indoor control valve assembly is connected with the outdoor control valve assembly through a pipeline, the outdoor control valve assembly is connected with the outdoor heat exchanger through a pipeline, and the outdoor heat exchanger is connected with the compressor (1) through a pipeline.
2. A condenser flow path structure with frost prevention function according to claim 1, wherein: the indoor control valve assembly comprises an indoor expansion valve bypass check valve (3) and an indoor electronic expansion valve (4), and the indoor expansion valve bypass check valve (3) and the indoor electronic expansion valve (4) are connected in parallel through pipelines.
3. A condenser flow path structure with frost prevention function according to claim 1, wherein: the indoor control valve assembly comprises an indoor expansion valve bypass check valve (3) and an indoor electronic expansion valve (4), and the indoor expansion valve bypass check valve (3) and the indoor electronic expansion valve (4) are connected in parallel through pipelines.
4. A condenser flow path structure with frost prevention function according to claim 1, wherein: an anti-frost loop inlet side (5) is arranged on a pipeline between the indoor control valve assembly and the outdoor control valve assembly, the anti-frost loop inlet side (5) is connected with an anti-frost loop outlet side (6) through a pipeline, the anti-frost loop inlet side (5) is connected with an outdoor heat exchanger through a pipeline, and the outdoor pipe heat exchanger is arranged on one side of the anti-frost loop inlet side (5) and one side of the anti-frost loop outlet side (6).
5. The condenser flow path structure with frost prevention function according to claim 4, wherein: the outdoor heat exchanger comprises an outdoor side heat exchanger liquid distributor (9) and an outdoor side heat exchanger gas collecting tube (10), and a plurality of outdoor side heat exchanger liquid distributors (9) are connected with a plurality of outdoor side heat exchanger gas collecting tubes (10).
6. A condenser flow path structure with frost prevention function according to claim 5, wherein: the outdoor side heat exchanger liquid distributor (9) and the outdoor side heat exchanger gas collecting tube (10) are respectively connected with the frost prevention loop inlet side (5) through pipelines.
7. A condenser flow path structure with frost prevention function according to claim 1, wherein: the outdoor side heat exchanger is a fin heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320052431.7U CN219014671U (en) | 2023-01-09 | 2023-01-09 | Condenser flow path structure with frost prevention function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320052431.7U CN219014671U (en) | 2023-01-09 | 2023-01-09 | Condenser flow path structure with frost prevention function |
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| Publication Number | Publication Date |
|---|---|
| CN219014671U true CN219014671U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320052431.7U Active CN219014671U (en) | 2023-01-09 | 2023-01-09 | Condenser flow path structure with frost prevention function |
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2023
- 2023-01-09 CN CN202320052431.7U patent/CN219014671U/en active Active
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