CN212274330U - Defrosting device adopting secondary condensation of refrigerant - Google Patents
Defrosting device adopting secondary condensation of refrigerant Download PDFInfo
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- CN212274330U CN212274330U CN202020912018.XU CN202020912018U CN212274330U CN 212274330 U CN212274330 U CN 212274330U CN 202020912018 U CN202020912018 U CN 202020912018U CN 212274330 U CN212274330 U CN 212274330U
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Abstract
The utility model discloses an adopt defrosting device of refrigerant secondary condensation, including the primary evaporation plant that is arranged in the liquid refrigerant after supplying the condenser condensation to evaporate the endothermic heat absorption, be arranged in carrying the liquid refrigerant in the refrigeration trunk line to the reposition of redundant personnel pipeline in the primary evaporation plant and be used for carrying the vapor-liquid mixture refrigerant or the gas refrigerant that the evaporation endothermal formed to the defrosting pipeline of the evaporimeter department of waiting to defrost, the head end side of reposition of redundant personnel pipeline connects on the refrigeration trunk line that is used for carrying the liquid refrigerant, and the end-to-end connection is in the import department of primary evaporation plant; the head end of the defrosting pipeline is connected with the outlet of the primary evaporation device, and the tail end of the defrosting pipeline is connected with the inlet of the evaporator to be defrosted. The utility model discloses with the vapour-liquid mixture refrigerant or the gas refrigerant that the liquid refrigerant formed after the evaporation heat absorption in evaporation plant as defrosting medium, melt frosting on the evaporimeter, realize the output of twice refrigerating output, effectively improve refrigerating system's refrigerating output.
Description
Technical Field
The utility model relates to a refrigerating system's defrosting device, concretely relates to defrosting device who adopts refrigerant secondary condensation.
Background
In the operation process of the refrigeration system, when the evaporation temperature is lower than 0 ℃, the phenomenon of frosting can occur on the evaporator, so that the heat exchange efficiency and the refrigeration efficiency are reduced, and defrosting treatment is required.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that above-mentioned exists, provide an adopt defrosting device of refrigerant secondary condensation, this defrosting device adopts the vapour-liquid mixture refrigerant or the gas refrigerant that the liquid refrigerant forms after the evaporation heat absorption in an evaporation plant as the medium that defrosts, melts frosting on the evaporimeter, realizes the output of twice refrigerating capacity, effectively improves refrigerating system's refrigerating capacity.
The purpose of the utility model is realized through the following technical scheme:
a defrosting device adopting secondary condensation of a refrigerant is integrated in a refrigerating system and comprises a primary evaporation device, a shunt pipeline and a defrosting pipeline, wherein the primary evaporation device is used for evaporating and absorbing heat for a liquid refrigerant condensed by a condenser, the shunt pipeline is used for conveying the liquid refrigerant in a main refrigeration pipeline to the primary evaporation device, and the defrosting pipeline is used for conveying a vapor-liquid mixture refrigerant or a gas refrigerant formed by evaporation and heat absorption to an evaporator to be defrosted;
the head end of the defrosting pipeline is connected with the outlet of the primary evaporation device, and the tail end of the defrosting pipeline is connected with the inlet of the evaporator to be defrosted.
The defrosting device adopting the secondary condensation of the 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 or gas 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 primary evaporation device through the shunt pipeline, and in the primary evaporation device, 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 primary evaporation device to be evaporated and absorb heat, the main refrigeration pipeline is supercooled or a specific environment is cooled, the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and a primary refrigeration effect is generated.
The vapor-liquid mixture refrigerant or the gas refrigerant is conveyed to an evaporator to be defrosted through a defrosting pipeline, and the mixture refrigerant or the gas refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator. In the defrosting process, a refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to secondary improvement of heat absorption capacity), is conveyed into a refrigerating evaporator, is subjected to secondary evaporation, generates a secondary refrigerating effect, and realizes output of two refrigerating capacities.
The utility model discloses a preferred scheme, wherein, treat that the export of the evaporimeter of defrosting is connected with the head end of secondary evaporation pipeline, and the end-to-end connection of this secondary evaporation pipeline is in the import department of refrigerated evaporimeter.
The utility model discloses a preferred scheme, wherein, evaporation plant includes primary expansion valve and an evaporation heat exchanger, primary expansion valve sets up on the reposition of redundant personnel pipeline.
Preferably, the primary 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 pressure controller who is arranged in adjusting the pressure of the medium of defrosting in the pipeline on the pipeline of defrosting.
The utility model discloses a preferred scheme, wherein, be equipped with the temperature sensor who is arranged in detecting the temperature of the medium of defrosting in the pipeline on the defrosting pipeline.
Compared with the prior art, the utility model following beneficial effect has:
1. after being condensed by the condenser, the refrigerant serving as a defrosting medium is subjected to primary condensation, and the refrigerating capacity is obtained. Part of the liquid refrigerant is shunted into the primary evaporation device, and the liquid refrigerant is evaporated for the first time to absorb heat, so that the primary refrigeration is completed. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to the secondary improvement of the heat absorption capacity), is conveyed to the refrigerated evaporator and is subjected to secondary evaporation to generate a secondary refrigeration effect, so that the output of the secondary refrigeration capacity is realized, and the refrigeration capacity of the refrigeration system is effectively improved.
2. 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.
Drawings
FIG. 1 is a pressure-enthalpy diagram of one embodiment 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 primary evaporative heat exchanger inlet, 6 indicates the inlet of the evaporator for defrosting, and 7 indicates the outlet of the evaporator for defrosting; wherein, the circulation path of the refrigerant as the defrosting medium is as follows: 1-2-3-5-6-7-4.
Figure 2 is a pressure enthalpy diagram for another embodiment.
When neglecting the pipe pressure loss, the pressures at points 5, 6, and 7 should be the same, but for clarity of the entire flow of defrosting refrigerant, the pressures at 5, 6, and 7 are slightly differentiated in fig. 1 and 2.
Fig. 3 is a schematic structural diagram of an embodiment of the defrosting apparatus using secondary condensation of the refrigerant according to the present invention, which is applied to a refrigeration system, wherein the dotted line represents a defrosting pipeline.
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 apparatus using secondary condensation of refrigerant in the present embodiment is integrated in a refrigeration system, and includes a primary evaporation apparatus for evaporating and absorbing heat from a liquid refrigerant condensed by a condenser 1, a branch pipe 2 for conveying the liquid refrigerant in a main refrigeration pipe 3 to the primary evaporation apparatus, and a defrosting pipe 3 for conveying a vapor-liquid mixture refrigerant formed by evaporation and absorption to an evaporator 5(a) to be defrosted, wherein a head end of the branch pipe 2 is connected by the main refrigeration pipe 3 for conveying the liquid refrigerant, and a tail end of the branch pipe is connected to an inlet of the primary evaporation apparatus, a head end of the defrosting pipe 3 is connected to an outlet of the primary evaporation apparatus, and a tail end of the defrosting pipe is connected to an inlet of the evaporator 5(a) to be defrosted.
Referring to fig. 3, the outlet of the evaporator 5(a) to be defrosted is connected to the head end of a secondary evaporation pipe, the tail end of which is connected to the inlet of the evaporator 5(b) being refrigerated. Referring to fig. 3, the primary evaporation apparatus includes a primary expansion valve 6 and a primary evaporation heat exchanger 7, and the primary expansion valve 6 is disposed on the diversion conduit 2. Further, the primary evaporation heat exchanger 7 is arranged outside the main refrigeration pipeline 3 for conveying liquid refrigerant, and is used for supercooling the refrigerant in the main refrigeration pipeline 3 and improving the refrigeration capacity of the refrigerant.
Specifically, the defrosting pipe 3 is provided with a pressure controller for adjusting the pressure of the defrosting medium in the pipe and a temperature sensor for detecting the temperature of the defrosting medium in the pipe.
Referring to fig. 1 and 3, the defrosting method using secondary condensation of the refrigerant in the present embodiment includes the following steps:
condensing the high-temperature and high-pressure gas refrigerant into a liquid refrigerant by a condenser 1 of the refrigeration system, as in process 2-3; part of liquid refrigerant (most of the liquid refrigerant is used for normal refrigeration work, and the rest of the liquid refrigerant is used for defrosting of an evaporator) formed after condensation of the condenser 1 is shunted to a primary evaporation device through a shunt pipeline 2, and in the primary evaporation device, the liquid refrigerant is throttled and evaporated to enable the liquid refrigerant in a main refrigeration pipeline 3 to be supercooled; after supercooling, the liquid refrigerant absorbs heat and is converted into a vapor-liquid mixture refrigerant, as in process 3-6; the gas-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipeline 4, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frost on the evaporator, as in the process 6-7. Further, in the present embodiment, the circulation path of the refrigerant as the defrosting medium is: 1-2-3-5-6-7-4; of course, the point 7 and the point 4 may coincide, that is, the defrosted refrigerant is directly used in other refrigeration occasions without throttling.
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.
In the defrosting operation, at least one evaporator is refrigerating, and in this embodiment, two evaporators switched to operate in turn are provided, but of course, the number of the evaporators may be three, four or more. After the defrosting operation is finished, the refrigerant is sent downward to the evaporator 5(b) which is performing cooling to be evaporated, as in process 4-1.
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. 1 and 3, the defrosting apparatus using secondary condensation of the refrigerant in the present embodiment operates according to the following principle:
when the refrigeration system works, the compressor 8 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 1, and then the liquid refrigerant is conveyed to the refrigeration evaporator through the refrigeration main pipeline 3. In the process, the liquid refrigerant formed after the condenser 1 is condensed is shunted into the primary evaporation device through the shunt pipe 2, and the primary evaporation device utilizes part of the liquid refrigerant to carry out supercooling on the liquid refrigerant in the main refrigeration pipe 3, so that the specific enthalpy of the liquid refrigerant to be conveyed to the refrigeration evaporator is lower (the temperature is lower) to improve the heat absorption (refrigeration) capacity of the primary evaporation device.
In the supercooling process, the liquid refrigerant is evaporated and absorbs heat to be converted into a vapor-liquid mixture refrigerant, and then the vapor-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipeline 4, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator.
Specifically, referring to the figure 1, the abscissa represents the magnitude of the enthalpy, the ordinate represents the magnitude of the pressure, the curve represents the saturation curve, the medium in the region enclosed by the curve is in a vapor-liquid mixed state, the left side is in a liquid state, and the right side is in a gaseous state. Wherein, the 1-2 process is a process that the compressor 8 compresses the gas, so that the low-temperature and low-pressure gas is changed into high-temperature and high-pressure gas, the 2-3 process is an isobaric cooling process, the 3-4 process is an isenthalpic pressure reduction process, and the 4-1 process is an isobaric heat absorption process, namely representing the heat absorption capacity of the refrigeration medium.
2-3*The refrigerant contains compression work and condensation heat, and the heat release is completed in the condenser of the traditional refrigeration system if the refrigerant is to be positioned at 2-3*The defrosting medium is used for defrosting under the state, namely an evaporator to be defrosted is a condenser of a traditional refrigerating system, and compression work or condensation heat is transferred to air, so that the refrigerating efficiency of the refrigerating system is reduced. On the contrary, although at 3*The liquid in the state of-3 does not contain compression work and condensation heat, has small enthalpy value, is easy to control, has the capacity of releasing heat equal to the capacity of absorbing heat, but has large required flow, low defrosting efficiency and short defrosting time interval.
Further, after the refrigerant is condensed by the condenser 1 (equivalent to the refrigerant serving as the defrosting medium is subjected to primary condensation), the part of the refrigerant enters the primary evaporation device to be evaporated and absorb heat, and is subcooled in the main refrigeration pipeline 3, so that the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and the primary refrigeration effect is generated. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to secondary improvement of heat absorption capacity), and is conveyed to the evaporator 5(b) for refrigeration to perform secondary evaporation, so that a secondary refrigeration effect is generated, and the output of two refrigeration amounts is realized.
Example 2
Referring to fig. 2, unlike embodiment 1, in the present embodiment, after being supercooled, the liquid refrigerant is converted into a gas refrigerant by heat absorption, as in processes 3 to 6; the gas-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipe 4, and the gas refrigerant is used as a defrosting medium for releasing heat to melt frost on the evaporator, as in the 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 (6)
1. A defrosting device adopting secondary condensation of a refrigerant is integrated in a refrigerating system and is characterized by comprising a primary evaporation device, a shunt pipeline and a defrosting pipeline, wherein the primary evaporation device is used for evaporating and absorbing heat for a liquid refrigerant condensed by a condenser, the shunt pipeline is used for conveying the liquid refrigerant in a main refrigeration pipeline into the primary evaporation device, the defrosting pipeline is used for conveying a vapor-liquid mixture refrigerant or a gas refrigerant formed by evaporation and heat absorption to an evaporator to be defrosted, the head end of the shunt pipeline is connected to the main refrigeration pipeline for conveying the liquid refrigerant in a bypassing manner, and the tail end of the shunt pipeline is connected to the inlet of the primary evaporation device;
the head end of the defrosting pipeline is connected with the outlet of the primary evaporation device, and the tail end of the defrosting pipeline is connected with the inlet of the evaporator to be defrosted.
2. The defrosting apparatus using secondary condensation of refrigerant according to claim 1 wherein the outlet of the evaporator to be defrosted is connected to the head end of a secondary evaporation pipe, the tail end of which is connected to the inlet of the evaporator being refrigerated.
3. The defrosting apparatus using secondary condensation of refrigerant according to claim 1 wherein the primary evaporation apparatus comprises a primary expansion valve and a primary evaporation heat exchanger, the primary expansion valve being provided on the diverging pipe.
4. The defrosting device adopting secondary condensation of refrigerant according to claim 3, wherein the primary evaporation heat exchanger is arranged outside a main cooling pipeline for conveying liquid refrigerant and is used for supercooling the refrigerant in the main cooling pipeline so as to improve the refrigerating capacity of the refrigerant.
5. A defrosting apparatus using secondary condensation of refrigerant according to any one of claims 1 to 4 wherein the defrosting pipe is provided with a pressure controller for adjusting the pressure of the defrosting medium in the pipe.
6. The defrosting apparatus using secondary condensation of refrigerant according to any one of claims 1 to 4 wherein the defrosting pipe is provided with a temperature sensor for detecting the temperature of the defrosting medium in the pipe.
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| CN202020912018.XU CN212274330U (en) | 2020-05-26 | 2020-05-26 | Defrosting device adopting secondary condensation of refrigerant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111536720A (en) * | 2020-05-26 | 2020-08-14 | 广东省现代农业装备研究所 | Defrosting method and device adopting secondary condensation of refrigerant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536720A (en) * | 2020-05-26 | 2020-08-14 | 广东省现代农业装备研究所 | Defrosting method and device adopting secondary condensation of refrigerant |
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