CN214199279U - CO2 air source heat pump unit without defrosting reversing device - Google Patents
CO2 air source heat pump unit without defrosting reversing device Download PDFInfo
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- CN214199279U CN214199279U CN202022746646.8U CN202022746646U CN214199279U CN 214199279 U CN214199279 U CN 214199279U CN 202022746646 U CN202022746646 U CN 202022746646U CN 214199279 U CN214199279 U CN 214199279U
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Abstract
The utility model provides a CO without defrosting reversing device2An air source heat pump unit comprises a water heat exchanger connected with an air heat exchanger through a pipeline, and CO is arranged on the pipeline connecting the input end of the water heat exchanger with the air heat exchanger2The compressor or the air pipe two-way valve, the expansion valve or the liquid pipe two-way valve is arranged on a pipeline connecting the output end of the water heat exchanger and the air heat exchanger, and the bottom of the air heat exchanger is higher than the top of the water heat exchanger. The utility model discloses a do not need defrosting switching-over device's CO2The air source heat pump unit and the defrosting method thereof do not need a switching device, and thoroughly solve the problems of complexity, low reliability, high cost and the like of the traditional reversing device; the surface temperature of the wind heat exchanger is far lower than that of the traditional reverse circulation scheme, the heat loss is obviously reduced, the defrosting energy consumption is low, and the comprehensive operation efficiency is improved; the defrosting process has no high-low pressure switching, eliminates the impact and fluid reversing of the traditional defrosting mode, effectively protects the operation safety of each part, prolongs the service life and reduces the defrosting noise.
Description
Technical Field
The utility model relates to a refrigeration heat pump technical field especially relates to a CO that does not need defrosting switching-over device2An air source heat pump unit.
Background
CO2The air source heat pump unit obtains wide attention and research in recent years by virtue of excellent heating capacity and natural working medium, and at present, CO is troubled2The heat pump has a great problem of heating and defrosting, and the existing air source heat pump generally adopts a reverse cycle defrosting method, namely, the air source heat pump is switched to a refrigerating mode to absorb heat from a water system, and a compressor is used for transferring the heat to an air heat exchanger to increase the surface temperature of the air heat exchanger so as to melt and remove frost. But for CO2Because the pressure of the heat pump is very high, no proper four-way reversing valve exists at present, an electromagnetic valve bank or a three-way valve bank is usually adopted to replace the four-way reversing valve to perform reverse circulation defrosting, or a hot gas bypass defrosting method is adopted, and the following problems exist:
1) the electromagnetic valve bank or the three-way valve bank has high price, complex structure, low reliability and capability of treating CO2The popularization of the heat pump causes certain difficulty, and although the number of valves of the hot gas bypass defrosting scheme is small, the defrosting speed is slow.
2) The air heat exchanger is heated to a higher temperature, which can reach more than 50 ℃ at most, regardless of reverse cycle defrosting or hot gas bypass defrosting, because the air temperature is low in winter, a large amount of heat is dissipated into the air, the lower the air temperature is, the greater the heat dissipation loss is, and in addition, because the defrosting phenomenon is caused by no frost and error, the heat loss caused by defrosting is larger.
3) During defrosting, valves are switched, fluid is reversed, and system pressure and temperature are changed violently, so that impact is caused on all parts of the system, normal oil return of a press is not facilitated, the whole service life of a unit is shortened, extra noise is generated, and the noise problem of the air source heat pump is aggravated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects existing in the prior art and provide a CO without defrosting and reversing device2The air source heat pump unit reduces heat loss, has low defrosting energy consumption and improves comprehensive operation efficiency. The utility model adopts the technical proposal that:
CO without defrosting reversing device2The air source heat pump unit comprises a water heat exchanger, the water heat exchanger is connected with an air heat exchanger through a pipeline, and CO is arranged on the pipeline connecting the input end of the water heat exchanger and the air heat exchanger2The air heat exchanger is arranged above the water heat exchanger.
Preferably, said CO does not require a defrost switch2The air source heat pump unit is characterized in that a liquid storage device is further arranged on a pipeline connected with the output end of the water heat exchanger and the air heat exchanger, an expansion valve or a liquid pipe two-way valve is arranged on the pipeline connected with the output end of the liquid storage device and the output end of the water heat exchanger, and a fluorine pump is arranged on the pipeline connected with the liquid pipe two-way valve and the liquid storage device.
The utility model has the advantages that: the utility model discloses a do not need defrosting switching-over device's CO2The air source heat pump unit does not need a switching device, and thoroughly solves the problems of complexity, low reliability, high cost and the like of the traditional reversing device; the surface temperature of the wind heat exchanger is far lower than that of the traditional reverse circulation scheme, the heat loss is obviously reduced, the defrosting energy consumption is low, and the comprehensive operation efficiency is improved; the defrosting process has no high-low pressure switching, eliminates the impact and fluid reversing of the traditional defrosting mode, effectively protects the operation safety of each part, prolongs the service life and reduces the defrosting noise.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of embodiment 1 of the present invention.
Fig. 2 is a schematic view of embodiment 2 of the present invention.
FIG. 3 is a schematic diagram of temperature measurement point distribution during defrost mode.
The numbering in the figures is as follows: 1-CO2A compressor; 2-a water heat exchanger; 3-an expansion valve; 4-wind heat exchanger; 5-liquid pipe two-way valve; 6-gas pipe two-way valve; 7-a fluorine pump; 8-reservoir.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
CO without defrosting reversing device2An air source heat pump unit comprises a water heat exchanger 2, wherein the water heat exchanger 2 is connected with an air heat exchanger 4 through a pipeline, and CO is arranged on the pipeline connecting the input end of the water heat exchanger 2 with the air heat exchanger 42The air-conditioning system comprises a compressor 1 or an air pipe two-way valve 6, an expansion valve 3 or a liquid pipe two-way valve 5 is arranged on a pipeline connecting an output end of a water heat exchanger 2 and an air heat exchanger 4, and the air heat exchanger 4 is arranged above the water heat exchanger 2.
CO without defrosting reversing device2The defrosting method of the air source heat pump unit comprises the following steps:
1) when the heat pump unit reaches the defrosting state, CO is closed2 Compressor 1 and wind heat exchanger 4, holding t1Time;
2) opening the air pipe two-way valve 6 and the liquid pipe two-way valve 5, opening the air heat exchanger 4 and the water heat exchanger 2, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger 41And outlet refrigerant temperatureDegree T2And the water temperature T at the inlet of the water heat exchanger 23And the outlet water temperature T4And when any one of the following conditions is reached, the defrosting is finished:
duration of defrosting>tm；
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
Wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) And after defrosting is finished, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are closed.
In the embodiment, the defrosting is carried out by adopting a heat pipe natural circulation mode, and the unit has two operation modes: a heat pump heating mode and a heat pipe defrosting mode, wherein in the heat pump heating mode, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are both closed, and at the moment, CO is in the closed state2The compressor 1, the water heat exchanger 2, the expansion valve 3 and the air heat exchanger 4 form a CO2Heat pump cycle (for ease of illustration, only core components are listed, other COs not related to defrost function2Heat pump accessories are not explicitly shown), the water heat exchanger 2 serves as a condenser and is connected with the tail end demand side to supply circulating hot water for the condenser, the wind heat exchanger 4 serves as an evaporator, and the unit is switched to a heat pipe defrosting mode when defrosting is needed along with the fact that the frost formation of the wind heat exchanger is intensified.
At this time, CO2The compressor 1 is closed, the fan of the air heat exchanger 4 is closed and is kept for a certain time, the pressure and the temperature inside the unit are gradually balanced, then the liquid pipe two-way valve 5 and the air pipe two-way valve 6 are opened, due to the existence of height difference and temperature difference, the air heat exchanger 4 and the water heat exchanger 2 are directly communicated to form a separated heat pipe system, a water channel of the water heat exchanger 2 is kept circulating, hot water heats and evaporates a refrigerant in the water heat exchanger 2 and enters the air heat exchanger 4 through the air pipe two-way valve 6, the air heat exchanger 4 is frosted, the surface temperature is low (not higher than 0 ℃), and therefore refrigerant vapor is condensed into liquid through the air heat exchanger 4, and the liquid is condensed into liquid in the heavy air heat exchangerAnd the heat in the circulating water is transferred to the surface of the wind heat exchanger through the heat pipe operation mode driven by the temperature difference and the height difference, so that the temperature of a frost layer is gradually increased and melted, and when the frost is completely melted, the unit switches the heating mode of the regenerative pump.
In this embodiment, the unit does not have an active defrosting function, defrosting completely depends on the heat pipe mode, and the problems of reliability, heat loss, high energy consumption and the like caused by reverse cycle defrosting are completely eliminated, but the defrosting capacity of the heat pipe mode completely depends on the ambient temperature and the water temperature, particularly the water temperature, the higher the water temperature is, the larger the driving temperature difference is, the stronger the defrosting capacity is, and as mentioned in the background, CO2The water temperature of the heat pump is generally higher, so the defrosting effect of the heat pump is ensured.
Example 2
CO without defrosting reversing device2An air source heat pump unit comprises a water heat exchanger 2, wherein the water heat exchanger 2 is connected with an air heat exchanger 4 through a pipeline, and CO is arranged on the pipeline connecting the input end of the water heat exchanger 2 with the air heat exchanger 42The air-conditioning system comprises a compressor 1 or an air pipe two-way valve 6, an expansion valve 3 or a liquid pipe two-way valve 5 is arranged on a pipeline connecting an output end of a water heat exchanger 2 and an air heat exchanger 4, and the air heat exchanger 4 is arranged above the water heat exchanger 2.
The pipeline that 2 output of water heat exchanger and air heat exchanger 4 are connected still sets up reservoir 8, set up expansion valve 3 or liquid pipe two-way valve 5 on the pipeline that reservoir 8 and 2 output of water heat exchanger are connected, set up fluorine pump 7 on the pipeline that liquid pipe two-way valve 5 and reservoir 8 are connected.
CO without defrosting reversing device2The defrosting method of the air source heat pump unit comprises the following steps:
1) when the heat pump unit reaches the defrosting state, CO is closed2 Compressor 1 and wind heat exchanger 4, holding t1Time;
2) opening an air pipe two-way valve 6 and a liquid pipe two-way valve 5, opening an air heat exchanger 4 and a water heat exchanger 2, starting a fluorine pump 7, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger 41And outlet refrigerant temperature T2And the water temperature T at the inlet of the water heat exchanger 23And the outlet water temperature T4And when any one of the following conditions is reached, the defrosting is finished:
duration of defrosting>tm；
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
Wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) And after defrosting is finished, the liquid pipe two-way valve 5, the gas pipe two-way valve 6 and the fluorine pump 7 are closed.
This embodiment has adopted fluorine pump circulation mode to defrost, and the unit has two kinds of mode of operation: a heat pump heating mode and a fluorine pump defrosting mode, wherein in the heat pump heating mode, the fluorine pump 7, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are all closed, and at the moment, CO is in the state2The compressor 1, the water heat exchanger 2, the expansion valve 3, the liquid storage device 8 and the air heat exchanger 4 form a CO2Heat pump cycle (for ease of illustration, only core components are listed, other COs not related to defrost function2Heat pump accessories are not explicitly shown), the water heat exchanger 2 is used as a condenser and connected with the tail end demand side to supply circulating hot water for the condenser, the air heat exchanger 4 is used as an evaporator, and the unit is switched to a fluorine pump defrosting mode when defrosting is needed as the frosting of the air heat exchanger is increased.
At this time, CO2The compressor 1 is closed, the fan of the air heat exchanger 4 is closed and is kept for a certain time, the pressure and the temperature in the unit are gradually balanced, then, the fluorine, 7, the liquid pipe two-way valve 5 and the air pipe two-way valve 6 are opened, the air heat exchanger 4 and the water heat exchanger 2 are directly communicated through the fluorine pump 7 to form a fluorine pump system, and as the water path of the water heat exchanger 2 is kept circulating, hot water heats and evaporates a refrigerant in the water heat exchanger 2 and enters the refrigerant through the air pipe two-way valve 6The air heat exchanger 4 and the air heat exchanger are frosted, the surface temperature is low (not higher than 0 ℃), refrigerant steam is condensed into liquid through the air heat exchanger 4 and is kept in a liquid storage device, the liquid is circularly sent to the water heat exchanger 2 through the fluorine pump 7, the refrigerant is driven to circulate through the fluorine pump 7, heat in hot water is transferred to the surface of the air heat exchanger 4, the temperature of a frost layer is gradually increased and melted, and when frost is completely melted, the unit switches a regenerative pump heating mode.
Compared with the embodiment 1, the fluorine pump 7 is adopted to drive in the mode, so that the application range of the unit is wider, on one hand, the height difference limitation of the air heat exchanger 4 and the water heat exchanger 2 is eliminated, the requirement of the air heat exchanger 4 on the upper part of the water heat exchanger 2 is not met as required in the mode one, on the other hand, the temperature difference requirement of the air heat exchanger 4 and the water heat exchanger 2 is relaxed, even if the temperature difference between the two devices is smaller, the fluorine pump 7 is utilized to forcibly circulate, so that the sufficient heat exchange amount can be provided, and the defrosting effect of the unit is ensured.
The utility model discloses a do not need defrosting switching-over device's CO2The air source heat pump unit and the defrosting method thereof do not need a switching device, and thoroughly solve the problems of complexity, low reliability, high cost and the like of the traditional reversing device; the surface temperature of the wind heat exchanger is much lower than that of the traditional reverse circulation scheme, and the heat loss is obviously reduced. Moreover, the defrosting energy consumption is low, and the comprehensive operation efficiency is improved; the defrosting process has no high-low pressure switching, eliminates the impact and fluid reversing of the traditional defrosting mode, effectively protects the operation safety of each part, prolongs the service life and reduces the defrosting noise.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (2)
1. CO without defrosting reversing device2The air source heat pump unit is characterized by comprising a water heat exchanger (2), wherein the water heat exchangerThe heat exchanger (2) is connected with the air heat exchanger (4) through a pipeline, and CO is arranged on the pipeline connecting the input end of the water heat exchanger (2) and the air heat exchanger (4)2The air-conditioning system is characterized in that the air-conditioning system comprises a compressor (1) or an air pipe two-way valve (6), an expansion valve (3) or a liquid pipe two-way valve (5) is arranged on a pipeline connecting an output end of the water heat exchanger (2) and an air heat exchanger (4), and the air heat exchanger (4) is arranged above the water heat exchanger (2).
2. CO without defrost reversal as claimed in claim 12Air source heat pump unit, its characterized in that still sets up reservoir (8) on the pipeline that water heat exchanger (2) output and air heat exchanger (4) are connected, set up expansion valve (3) or liquid pipe two-way valve (5) on the pipeline that reservoir (8) and water heat exchanger (2) output are connected, set up fluorine pump (7) on the pipeline that liquid pipe two-way valve (5) and reservoir (8) are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022746646.8U CN214199279U (en) | 2020-11-24 | 2020-11-24 | CO2 air source heat pump unit without defrosting reversing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022746646.8U CN214199279U (en) | 2020-11-24 | 2020-11-24 | CO2 air source heat pump unit without defrosting reversing device |
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| Publication Number | Publication Date |
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| CN214199279U true CN214199279U (en) | 2021-09-14 |
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| CN202022746646.8U Active CN214199279U (en) | 2020-11-24 | 2020-11-24 | CO2 air source heat pump unit without defrosting reversing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460848A (en) * | 2020-11-24 | 2021-03-09 | 无锡同方人工环境有限公司 | Air source heat pump unit with heat pipe defrosting function and defrosting method thereof |
| CN112484342A (en) * | 2020-11-24 | 2021-03-12 | 无锡同方人工环境有限公司 | CO without defrosting reversing device2Air source heat pump unit and defrosting method thereof |
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2020
- 2020-11-24 CN CN202022746646.8U patent/CN214199279U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460848A (en) * | 2020-11-24 | 2021-03-09 | 无锡同方人工环境有限公司 | Air source heat pump unit with heat pipe defrosting function and defrosting method thereof |
| CN112484342A (en) * | 2020-11-24 | 2021-03-12 | 无锡同方人工环境有限公司 | CO without defrosting reversing device2Air source heat pump unit and defrosting method thereof |
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