CN212274333U - Defrosting device for secondary condensation and supercooling of main path refrigerant - Google Patents
Defrosting device for secondary condensation and supercooling of main path refrigerant Download PDFInfo
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- CN212274333U CN212274333U CN202020912069.2U CN202020912069U CN212274333U CN 212274333 U CN212274333 U CN 212274333U CN 202020912069 U CN202020912069 U CN 202020912069U CN 212274333 U CN212274333 U CN 212274333U
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Abstract
The utility model discloses a defrosting device for secondary condensation and supercooling a main refrigerant, which comprises a secondary condensation mechanism and a main pipeline supercooling mechanism, wherein the secondary condensation mechanism comprises a first cooler, a shunt pipeline and a defrosting pipeline; the head end of the shunting pipeline is connected to the refrigeration main pipeline in a bypassing mode, and the tail end of the shunting pipeline is connected to the inlet of the first cooler; the head end of the defrosting pipeline is connected to the outlet of the first cooler, and the tail end of the defrosting pipeline is connected to the inlet of the evaporator to be defrosted; the main pipeline supercooling mechanism comprises a second cooler and a defrosting liquid outlet pipeline, wherein the head end of the defrosting liquid outlet pipeline is connected to an outlet of an evaporator to be defrosted, and the tail end of the defrosting liquid outlet pipeline is connected to an inlet of the second cooler. The utility model discloses with the refrigerant that forms behind the evaporation heat absorption of liquid refrigerant in first cooler as the medium that defrosts, melt frosting on the evaporimeter to the refrigerant of refrigerant after adopting the defrosting carries out the subcooling to the refrigerant in the refrigeration trunk line, effectively improves refrigerating system's refrigerating output.
Description
Technical Field
The utility model relates to a refrigerating system's defrosting device, concretely relates to secondary condensation carries out supercooled defrosting device to main road refrigerant.
Background
In a refrigerating system, when a refrigerating unit carries out refrigerating work with an evaporation temperature device lower than 0 ℃, a frosting phenomenon often occurs, so that the heat exchange efficiency of an evaporator is reduced, and the refrigerating efficiency of the unit is reduced.
The existing defrosting modes mainly comprise refrigerant defrosting and non-refrigerant defrosting. The refrigerant defrosting mainly comprises superheated gas defrosting, liquid defrosting and gas-liquid mixed defrosting. The existing method for obtaining the defrosting refrigerant by compressing and then depressurizing increases energy consumption. The defrosting is carried out by mixing liquid refrigerant or vapor and liquid for defrosting, although the same problem as that of superheated gas defrosting does not exist, the specific enthalpy of defrosting is small, the required flow is large, the defrosting efficiency is low, the time required for single defrosting is long, and the defrosting time interval is short. The defrosting medium for liquid defrosting is mainly a high-pressure liquid refrigerant formed by condensing gas through a condenser; the vapor-liquid mixed defrosting refrigerant is directly throttled by the liquid refrigerant, and is not subjected to heating treatment, and has equal enthalpy with the high-pressure liquid refrigerant of the liquid defrosting only for reducing the temperature and the pressure of defrosting.
Further, in a common defrosting process, when a defrosting medium passes through an evaporator, heat is released to defrost, and the defrosting medium is often led into the evaporator to perform evaporation refrigeration. For example, in a continuous defrosting system, the defrosted refrigerant is sent to an evaporator (non-defrosted evaporator) that is cooling to absorb heat by evaporation; in the discontinuous defrosting system, the liquid can be stored temporarily, and the evaporator can be randomly selected to realize evaporation, and can be the evaporator which just completes the defrosting process. The defrosted refrigerant enters a refrigerating evaporator to cool a cooling object, and the evaporating temperature is required to be lower than the temperature of a cooled object, so that the refrigerating capacity of the defrosted refrigerant is not fully utilized, and the refrigerating capacity is small.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problems in the prior art, and provides a defrosting device which is used for secondary condensation and supercooling a main path refrigerant, wherein the defrosting device takes a vapor-liquid mixture refrigerant or a gas refrigerant formed after a liquid refrigerant is evaporated and absorbs heat in a first cooler as a defrosting medium to melt frosting on an evaporator, so that the defrosting device has the advantages of easy control, higher defrosting efficiency and the like, and can effectively improve the refrigerating capacity of a refrigerating system; and the refrigerant in the main refrigerating pipeline is supercooled by the defrosted refrigerant, so that the heat absorption capacity of the refrigerant in the main refrigerating pipeline is improved, the refrigerating capacity of the system is increased, and the defrosting mode is continuous defrosting.
The purpose of the utility model is realized through the following technical scheme:
a defrosting device for secondary condensation and supercooling of a main refrigerant is integrated in a refrigerating system and comprises a secondary condensation mechanism and a main pipeline supercooling mechanism; the secondary condensation mechanism comprises a first cooler for evaporating and absorbing heat of liquid refrigerants condensed by the condenser, a shunt pipeline for conveying the liquid refrigerants in the main refrigeration pipeline to the first cooler, and a defrosting pipeline for conveying vapor-liquid mixture refrigerants or gas refrigerants formed by evaporation and heat absorption to the evaporator to be defrosted; the head end of the shunting pipeline is connected to a refrigeration main pipeline for conveying liquid refrigerant in a bypassing way, and the tail end of the shunting pipeline is connected to the inlet of the first cooler; the head end of the defrosting pipeline is connected to the outlet of the first cooler, and the tail end of the defrosting pipeline is connected to the inlet of the evaporator to be defrosted;
the main pipe supercooling mechanism comprises a second cooler for supercooling the refrigerant of the refrigeration main pipe and a defrosting liquid outlet pipe for conveying the defrosted refrigerant to the second cooler, wherein the head end of the defrosting liquid outlet pipe is connected to the outlet of the evaporator to be defrosted, and the tail end of the defrosting liquid outlet pipe is connected to the inlet of the second cooler.
The defrosting device for performing secondary condensation and supercooling on the main path refrigerant has the working principle that:
when the refrigeration system works, the compressor compresses low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant through compression work, the high-temperature and high-pressure gas refrigerant is converted into liquid refrigerant after being condensed by the condenser, and then the liquid refrigerant is conveyed to the refrigeration evaporator through the refrigeration main pipeline. In the process, the liquid refrigerant formed after condensation of the condenser is shunted to the first cooler through the shunt pipeline, and in the first cooler, the liquid refrigerant is converted into a vapor-liquid mixture refrigerant or a gas refrigerant after evaporation and heat absorption.
Further, after the refrigerant is condensed by the condenser (namely, the refrigerant serving as a defrosting medium is subjected to primary condensation), the part of the refrigerant enters the first cooler to be evaporated and absorb heat, and is supercooled in the main refrigerating pipeline or is cooled in a specific environment, so that the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and a first refrigerating effect is generated.
The vapor-liquid mixture refrigerant is conveyed to an evaporator to be defrosted through a defrosting pipeline, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalently, the heat absorption capacity is improved for the second time), then, the defrosted refrigerant is conveyed into the second cooler through the defrosting liquid outlet pipeline for secondary evaporation, the refrigerant in the refrigeration main pipeline is supercooled, the secondary refrigeration effect is generated, the output of two refrigeration amounts is realized, and finally, the refrigerant which is subjected to supercooling operation is conveyed back to the compressor.
Further, in the second cooler, the refrigerant after defrosting supercools the refrigerant of the main refrigeration pipeline, which is equivalent to a high-pressure liquid refrigerant for transferring cold energy to the main refrigeration pipeline, and then the refrigerant of the main refrigeration pipeline is evaporated in the evaporator (non-defrosting evaporator) which is refrigerating. Since the temperature of the liquid refrigerant of the refrigeration main pipe is higher than the temperature of the cooling object (cooling object) of the refrigeration system, and the evaporation temperature of the refrigerant must be lower than the temperature of the cooling object, the utility model discloses in, with the liquid refrigerant of the refrigeration main pipe as the cooling object of the refrigerant after defrosting, the evaporation temperature of supercooling the liquid refrigerant of the refrigeration main pipe can be higher than the evaporation temperature of the evaporator that is refrigerating (namely the former evaporation pressure is greater than the latter evaporation pressure). According to the refrigeration and evaporation law, the lower the evaporation temperature is, the smaller the refrigeration capacity of the refrigeration system is, the lower the operation efficiency is, and the larger the energy consumption is; so the utility model discloses in, carry out the subcooling to the refrigerant of refrigeration trunk line in the refrigerant after will defrosting is carried to second cooler (evaporating temperature is higher), obtain the refrigerating output that the refrigerating output is greater than carrying the refrigerant after will defrosting to the refrigerating evaporimeter (evaporating temperature is lower) and carry out the evaporation, utilize the refrigerant after the defrosting more fully, obtain more refrigerating outputs.
The utility model discloses a preferred scheme, wherein, first cooler includes first expansion valve and first evaporative heat exchanger, first expansion valve sets up on the reposition of redundant personnel pipeline.
Preferably, the first evaporation heat exchanger is arranged outside a main refrigeration pipeline for conveying liquid refrigerant and used for supercooling the refrigerant in the main refrigeration pipeline and improving the refrigeration capacity of the refrigerant.
The utility model discloses a preferred scheme, wherein, be equipped with the defrosting pressure controller that is arranged in adjusting the pressure of the defrosting medium in the pipeline and be arranged in detecting the temperature sensor of the temperature of the defrosting medium in the pipeline on the defrosting pipeline.
The utility model discloses a preferred scheme, wherein, the import of second cooler is connected with the head end of return circuit pipeline, and the end-to-end connection of this return circuit pipeline's head end is in the import department of compressor.
Preferably, a loop pressure controller for adjusting the pressure of the gas refrigerant in the pipeline is arranged on the loop pipeline, and the loop pressure controller is used for controlling the evaporation temperature in the second cooler, so that the evaporation pressure of the defrosted refrigerant is the same as the defrosting condensation pressure.
The utility model discloses a preferred scheme, wherein, the second cooler includes the subcooling evaporimeter, and this subcooling evaporimeter sets up in the outside of refrigeration trunk line. The specific structure of the supercooling evaporator can refer to the structure of the evaporator in the prior art.
Compared with the prior art, the utility model following beneficial effect has:
1. the utility model provides a defrosting device is as defrosting medium with the vapour-liquid mixture refrigerant or the gas refrigerant that liquid refrigerant formed after the evaporation heat absorption in first cooler, melts frosting on the evaporimeter, has advantages such as easy control and defrosting efficiency are higher.
2. After being condensed by the condenser, the refrigerant serving as a defrosting medium is subjected to primary condensation, and the refrigerating capacity is obtained. And part of the liquid refrigerant is shunted into the first cooler, and the liquid refrigerant is evaporated for the first time to absorb heat, so that the first refrigeration is completed. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalently, the heat absorption capacity is improved for the second time), then, the defrosted refrigerant is subjected to secondary evaporation in the second cooler, the refrigerant in the main refrigerating pipeline is supercooled, a secondary refrigerating effect is generated, the output of twice refrigerating capacity is realized, and the refrigerating capacity of the refrigerating system is effectively improved.
3. Compare with traditional superheated gas defrosting mode (get the gas pipe mouth and arrange on the refrigeration trunk line between oil separator and condenser), the utility model discloses a liquid mouth of pipe can be arranged on the high-pressure liquid pipeline between condenser and evaporimeter to the refrigerant is got the liquid mouth of pipe, is closer cooled environment, has effectively shortened pipeline length and has reduced the pipeline quantity.
4. Adopt the refrigerant after the defrosting to carry out the subcooling to the refrigerant in the main refrigeration pipeline, be equivalent to transmit cold volume for the high-pressure liquid refrigerant of main refrigeration pipeline, the refrigerant by the main refrigeration pipeline evaporates in the refrigerated evaporimeter again, because of the liquid refrigerant's of main refrigeration pipeline temperature is higher than the cooling thing, the event carries out the evaporating temperature that the subcooling was carried out to the refrigerant of main refrigeration pipeline and is higher than the evaporating temperature who adopts refrigerated evaporimeter, has improved the heat absorption capacity of the refrigerant in the main refrigeration pipeline, has increased the refrigerating output.
Drawings
FIG. 1 is a pressure-enthalpy diagram of one embodiment of the present invention, wherein the numbers indicate the location of the refrigerant, 1 indicates the compressor inlet, 2 indicates the condenser inlet, 3 indicates the expansion valve inlet, 4 indicates the inlet of the evaporator for cooling, 5 indicates the first cooler inlet, 6 indicates the inlet of the evaporator to be defrosted, 7 indicates the second cooler inlet, 8 indicates the outlet of the defrosted refrigerant in the second cooler, and 9 indicates the inlet of the main line refrigerant of the first cooler; wherein, the circulation path of the refrigerant as the defrosting medium is as follows: 8-2-9-5-6-7, the circulation path of the refrigerant for normal refrigeration is as follows: 1-2-3-4.
Figure 2 is a pressure enthalpy diagram for another embodiment.
When neglecting the pipe pressure loss, the pressures at points 5, 6, 7 and 8 should be the same, but for clarity of the entire flow of defrosting refrigerant, the pressures at 5, 6, 7 and 8 are treated with slight differentiation in fig. 1 and 2.
Fig. 3 is a schematic structural diagram of an embodiment of the defrosting apparatus for performing secondary condensation and supercooling on the main path refrigerant according to the present invention, which is applied to the refrigeration system, wherein the dotted line represents a defrosting pipe.
Detailed Description
In order to make those skilled in the art understand the technical solution of the present invention well, the present invention will be further described below with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 3, the defrosting device for secondary condensation and supercooling the main refrigerant in the present embodiment is integrated in a refrigeration system, and includes a secondary condensation mechanism and a main pipe supercooling mechanism; the secondary condensation mechanism comprises a first cooler 3 for evaporating and absorbing heat of liquid refrigerant condensed by a condenser 2, a branch pipeline 1 for conveying the liquid refrigerant in a refrigeration main pipeline 4 to the first cooler 3, and a defrosting pipeline 6 for conveying a vapor-liquid mixture refrigerant or a gas refrigerant formed by evaporation and heat absorption to an evaporator 5(a) to be defrosted; the head end of the diversion pipeline 1 is connected to a refrigeration main pipeline 4 for conveying liquid refrigerant in a bypassing way, and the tail end of the diversion pipeline is connected to the inlet of the first cooler 3; the defrosting duct 6 is connected at the head end to the outlet of the first cooler 3 and at the tail end to the inlet of the evaporator 5(a) to be defrosted.
The main pipe supercooling mechanism comprises a second cooler 8 for supercooling the refrigerant of the refrigeration main pipe 4 and a defrosting liquid outlet pipe 7 for conveying the defrosted refrigerant to the second cooler 8, wherein the head end of the defrosting liquid outlet pipe 7 is connected to an outlet of the evaporator 5(a) to be defrosted, and the tail end of the defrosting liquid outlet pipe 7 is connected to an inlet of the second cooler 8.
Referring to fig. 3, the first cooler 3 includes a first expansion valve provided on the divided flow pipe 1 and a first evaporative heat exchanger.
Further, the first evaporation heat exchanger is arranged on the outer side of the main refrigeration pipeline 4 used for conveying liquid refrigerant and used for supercooling the refrigerant in the main refrigeration pipeline 4 and improving the refrigeration capacity of the refrigerant.
Referring to fig. 3, the defrosting duct 6 is provided with a defrosting pressure controller 12 for adjusting the pressure of the defrosting medium in the duct and a temperature sensor 11 for detecting the temperature of the defrosting medium in the duct.
With reference to fig. 3, the inlet of the second cooler 8 is connected to the head end of a circuit pipe 9, the head end of the circuit pipe 9 being connected at the inlet of a compressor 10.
Further, a loop pressure controller 13 for adjusting the pressure of the gas refrigerant in the loop pipe 9 is provided, and the loop pressure controller 13 is used for controlling the evaporation temperature in the second cooler 8 so that the evaporation pressure of the defrosted refrigerant is the same as the defrosting condensation pressure.
Referring to fig. 3, the second cooler 8 comprises a subcooling evaporator which is disposed outside the main refrigeration conduit 4. The specific structure of the supercooling evaporator can refer to the structure of the evaporator in the prior art.
Referring to fig. 1 and 3, the defrosting method of secondary condensation and supercooling of the main path refrigerant in the present embodiment includes the steps of:
part of liquid refrigerant (mostly used for normal refrigeration work and a small part for defrosting of an evaporator) formed after condensation of the condenser 2 is shunted to the first cooler 3 through a shunt pipe 1; the liquid refrigerant evaporates in the first cooler 3 absorbing heat, subcooling the liquid refrigerant in the main refrigeration line 4 so that the liquid refrigerant to be delivered to the refrigerated evaporator 5(b) has a lower specific enthalpy (lower temperature) to increase the heat absorption (refrigeration) capacity; and converted to a vapor-liquid mixture refrigerant as in process 9-6. Delivering a vapor-liquid mixture refrigerant to an evaporator 5(a) to be defrosted through a defrosting pipeline 6, wherein the vapor-liquid mixture refrigerant is used as a defrosting medium to release heat to melt frost on the evaporator, as in the process 6-7; the defrosted refrigerant is conveyed to a second cooler 8 through a defrosted liquid outlet pipeline 7; the defrosted refrigerant evaporates and absorbs heat in the second cooler 8 to supercool the refrigerant in the main refrigerating pipeline 4, as in process 7-8, and the evaporation temperature in the second cooler 8 is higher than that of the evaporator 5(b) which is refrigerating; the gaseous refrigerant having completed the subcooling operation is sent back to the compressor 10 through the return conduit 9 for cycle operation, as in process 8-2.
Before defrosting, the evaporation frequency of the refrigerant as a defrosting medium is several times, namely, the refrigerant is not limited to one time, and can be multiple times, and the specific frequency can be flexibly selected according to practical application.
Referring to fig. 3, in the defrosting operation, at least one evaporator is refrigerating; in this embodiment, two evaporators which are switched to operate in turn are provided, but of course, the number of the evaporators can be three, four or more.
Specifically, in the present embodiment, the evaporation temperature of the refrigerant is higher than the melting temperature of frost formation of the evaporator 5(a) to be defrosted and lower than the condensation temperature of the refrigeration system. Wherein, when the frosting component is ice, the melting temperature is 0 ℃.
Referring to fig. 3, the defrosting duct 6 is connected to the output end of the first cooler 3 at the head end and extends to the evaporator 5(a) to be defrosted at the tail end.
Further, the defrosting pipe 6 is provided with a temperature sensor 11 for detecting the temperature of the refrigerant in the pipe and a defrosting pressure controller 12 for adjusting the pressure of the defrosting medium in the pipe.
Referring to fig. 3, the defrost-outlet duct 7 is connected at its head end to the outlet of the evaporator and at its tail end to the inlet of the second cooler 8.
With reference to fig. 3, the loop conduit 9 is connected at its head end to the outlet of the second cooler 8 and at its tail end to the inlet of the compressor 10.
Further, a loop pressure controller 13 for adjusting the pressure of the gas refrigerant in the loop pipe 9 is provided, and the loop pressure controller 13 is used for controlling the evaporation temperature in the second cooler 8 so that the evaporation pressure of the defrosted refrigerant is the same as the defrosting condensation pressure.
Referring to fig. 3, the first cooler 3 includes a first cold expansion valve and a first supercooling evaporator connected to the rear of the condenser 2 through the diverging pipe 1, and the first supercooling expansion valve is disposed on the diverging pipe 1.
Reference is made to the prior art for details of the construction of the cooler.
Referring to fig. 1 and 3, the defrosting apparatus for secondary condensing and supercooling the main path refrigerant in the present embodiment operates on the principle that:
when the refrigeration system works, the compressor 10 compresses low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant through compression work, the high-temperature and high-pressure gas refrigerant is converted into liquid refrigerant after being condensed by the condenser 2, and then the liquid refrigerant is conveyed to the refrigeration evaporator through the refrigeration main pipeline 4. In the process, the liquid refrigerant formed after condensation of the condenser 2 is branched to the first cooler 3 through the branch pipeline 1, and in the first cooler 3, the liquid refrigerant is converted into a vapor-liquid mixture refrigerant after evaporation and heat absorption.
Further, after the refrigerant is condensed by the condenser 2 (equivalent to the refrigerant serving as the defrosting medium is subjected to primary condensation), the part of the refrigerant enters the first cooler 3 to be evaporated and absorb heat, and is supercooled in the main refrigerating pipeline 4 or is cooled in a specific environment, so that the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and a first refrigeration effect is generated.
The vapor-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipeline 6, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frost on the evaporator. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalently, the heat absorption capacity is improved for the second time), then the defrosted refrigerant is subjected to secondary evaporation in the second cooler 8, the refrigerant in the main refrigerating pipeline 4 is subcooled to generate a secondary refrigerating effect, the output of twice refrigerating capacity is realized, and finally the gas refrigerant after the subcooling operation is conveyed back to the compressor 10, so that the refrigerating capacity of the refrigerating system is effectively improved.
Further, in the second cooler 8, the refrigerant after defrosting supercools the refrigerant of the main cooling pipe 4, which corresponds to a high-pressure liquid refrigerant that transfers cooling energy to the main cooling pipe 4, and is evaporated in the evaporator 5(b) that is cooling (non-defrosting evaporator) by the refrigerant of the main cooling pipe 4. Since the temperature of the liquid refrigerant of the main cooling pipe 4 is higher than the temperature of the cooling object (cooling object) of the refrigeration system, and the evaporation temperature of the refrigerant must be lower than the temperature of the cooling object, in the present invention, the liquid refrigerant of the main cooling pipe 4 is used as the cooling object of the refrigerant after defrosting, so the evaporation temperature for supercooling the liquid refrigerant of the main cooling pipe 4 can be higher than the evaporation temperature of the evaporator 5(b) being cooled (i.e. the former evaporation pressure is higher than the latter evaporation pressure). According to the refrigeration and evaporation law, the lower the evaporation temperature is, the smaller the refrigeration capacity of the refrigeration system is, the lower the operation efficiency is, and the larger the energy consumption is; so the utility model discloses in, carry out the subcooling to the refrigerant of refrigeration trunk line 4 in second cooler 8 (evaporating temperature is higher) with the refrigerant after the defrosting, obtain the refrigerating output that the refrigerating output is greater than carrying the refrigerant after the defrosting to the refrigerating evaporimeter 5(b) (evaporating temperature is lower) and carry out the evaporation, utilize the refrigerant after the defrosting more fully, obtain more refrigerating outputs.
Example 2
Referring to fig. 2, unlike embodiment 1, the liquid refrigerant evaporates and absorbs heat in the first cooler 3, and after being supercooled, the liquid refrigerant in the main refrigeration pipeline 4 is converted into a gas refrigerant, as in processes 9 to 6. Gaseous refrigerant is delivered to the evaporator 5(a) to be defrosted through the defrosting conduit 6, which acts as a defrosting medium, exothermically melting frost build-up on the evaporator, as in process 6-7.
Example 3
Unlike embodiment 1, when the refrigerant serving as the defrosting medium in this embodiment is first evaporated to absorb heat for cooling the set cooling environment, the energy use efficiency can be improved.
The above is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. A defrosting device for secondary condensation and supercooling of a main refrigerant is integrated in a refrigerating system and is characterized by comprising a secondary condensation mechanism and a main pipeline supercooling mechanism; the secondary condensation mechanism comprises a first cooler for evaporating and absorbing heat of liquid refrigerants condensed by the condenser, a shunt pipeline for conveying the liquid refrigerants in the main refrigeration pipeline to the first cooler, and a defrosting pipeline for conveying vapor-liquid mixture refrigerants or gas refrigerants formed by evaporation and heat absorption to the evaporator to be defrosted; the head end of the shunting pipeline is connected to a refrigeration main pipeline for conveying liquid refrigerant in a bypassing way, and the tail end of the shunting pipeline is connected to the inlet of the first cooler; the head end of the defrosting pipeline is connected to the outlet of the first cooler, and the tail end of the defrosting pipeline is connected to the inlet of the evaporator to be defrosted;
the main pipe supercooling mechanism comprises a second cooler for supercooling the refrigerant of the refrigeration main pipe and a defrosting liquid outlet pipe for conveying the defrosted refrigerant to the second cooler, wherein the head end of the defrosting liquid outlet pipe is connected to the outlet of the evaporator to be defrosted, and the tail end of the defrosting liquid outlet pipe is connected to the inlet of the second cooler.
2. The defrosting device of claim 1 wherein the first cooler includes a first expansion valve and a first evaporative heat exchanger, the first expansion valve being disposed on the tap line.
3. The defrosting device that secondarily condenses and supercools the main path refrigerant according to claim 2, wherein the first evaporative heat exchanger is disposed outside a main cooling pipe for transporting liquid refrigerant.
4. The defrosting apparatus of claim 1 wherein the defrosting conduit is provided with a defrosting pressure controller for adjusting the pressure of the defrosting medium in the conduit and a temperature sensor for detecting the temperature of the defrosting medium in the conduit.
5. The defrosting apparatus of claim 1 wherein the inlet of the secondary cooler is connected to the head of a loop pipe, the tail of the head of the loop pipe being connected to the inlet of the compressor.
6. The defrosting device of claim 5 wherein the circuit conduit is provided with a circuit pressure controller for regulating the pressure of the gaseous refrigerant in the conduit.
7. The defrosting device of secondary condensation and supercooling of a main refrigerant according to any one of claims 1 to 6, wherein the second cooler includes a supercooling evaporator provided outside the main cooling pipe.
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Cited By (1)
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| CN111536723A (en) * | 2020-05-26 | 2020-08-14 | 广东省现代农业装备研究所 | Defrosting method and device for secondary condensation and supercooling of main path refrigerant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111536723A (en) * | 2020-05-26 | 2020-08-14 | 广东省现代农业装备研究所 | Defrosting method and device for secondary condensation and supercooling of main path refrigerant |
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| GR01 | Patent grant |