CN112303948A - Multistage heat exchange system - Google Patents
Multistage heat exchange system Download PDFInfo
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- CN112303948A CN112303948A CN202011051642.6A CN202011051642A CN112303948A CN 112303948 A CN112303948 A CN 112303948A CN 202011051642 A CN202011051642 A CN 202011051642A CN 112303948 A CN112303948 A CN 112303948A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 95
- 238000010257 thawing Methods 0.000 claims abstract description 56
- 238000005057 refrigeration Methods 0.000 claims description 107
- 239000003507 refrigerant Substances 0.000 claims description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 230000017525 heat dissipation Effects 0.000 claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 14
- 230000008859 change Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 14
- 239000002826 coolant Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention belongs to the technical field of heat exchange, and particularly provides a multistage heat exchange system. The invention aims to solve the problems that the existing multistage heat exchange system is difficult to keep high-efficiency operation in a low-temperature and high-humidity environment and has heat waste in the heat exchange process. Therefore, the multistage heat exchange system comprises a heat exchange unit, a heating unit and a refrigerating unit, wherein the heating unit can exchange heat with a first heat exchange component of the heat exchange unit, the refrigerating unit can exchange heat with a second heat exchange component of the heat exchange unit, so that heat generated by the heat exchange unit in the heat exchange process can be effectively utilized, the heat exchange efficiency of the multistage heat exchange system is effectively improved, a defrosting branch is further arranged in the refrigerating unit, and a part of pipelines of the defrosting branch can exchange heat with a heater, so that the frosting problem of the refrigerating heat exchanger can be effectively solved through simple structural change, the heat exchange efficiency is further improved, and the multistage heat exchange system can be effectively ensured to be in a high-efficiency running state in a low-temperature and high-humidity environment.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and particularly provides a multistage heat exchange system.
Background
The heat exchange system has great demands in various fields such as the air conditioning field, the industrial refrigeration field, the refrigeration and freezing field and the like, and along with the continuous expansion of the application field, users also put forward higher and higher requirements on the adaptability of the heat exchange system, and especially pay attention to the heat exchange capability of the heat exchange system in a low-temperature environment. Many existing heat exchange systems directly realize heat exchange through a refrigerant circulation loop, taking a refrigeration process as an example, a liquid (mixed with saturated steam) refrigerant is evaporated in a coil of an evaporator to absorb heat from air outside the coil to realize refrigeration, namely, in the heat exchange process, the refrigerant directly exchanges heat with indoor air, and does not pass through other heat exchange processes in the middle. However, the method of directly cooling air by using refrigerant has the problems of large heat exchange temperature difference, easy frosting, low efficiency, large refrigerant charge amount and the like.
In order to effectively avoid the above problems, in recent years, a multi-stage heat exchange system combining a refrigerant circulation circuit and a secondary refrigerant circulation circuit has been increasingly used. Taking the process of refrigerating by the multistage heat exchange system as an example, the evaporator arranged on the refrigerant circulation loop can exchange heat with the secondary refrigerant in the secondary refrigerant circulation loop firstly, and then exchange heat with indoor air by the secondary refrigerant to realize refrigeration. The multistage heat exchange system mainly realizes heat transfer through the secondary refrigerant, so that the filling amount of the refrigerant is greatly reduced, and the secondary refrigerant circulating loop has the advantages of high safety, high stability and the like because no high-pressure position exists. However, the existing multistage heat exchange system still has some problems, for example, only one of the two heat exchangers in the existing refrigerant circulation loop is usually effectively utilized, and the other heat exchanger only exchanges heat with the outside air in the heat exchange process to assist the normal operation of the heat exchange process, so that the heat involved in the heat exchange process is wasted, and the heat utilization rate is lowered; in addition, the existing multistage heat exchange system usually only focuses on the problem of frosting possibly existing in the refrigerant circulation loop, but does not focus on the problem of frosting possibly existing in the secondary refrigerant circulation loop, so that the problem of low heat exchange efficiency when the existing multistage heat exchange system operates in a low-temperature and high-humidity environment is caused.
Accordingly, there is a need in the art for a new multi-stage heat exchange system that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems that the conventional multi-stage heat exchange system is difficult to operate in a low-temperature and high-humidity environment and is prone to heat waste during heat exchange, the present invention provides a multi-stage heat exchange system, which includes a heat exchange unit, a heating unit and a refrigerating unit, wherein the heat exchange unit includes a refrigerant circulation loop, and a first heat exchange member, a throttling member, a second heat exchange member and a compressor sequentially disposed on the refrigerant circulation loop, the heating unit includes a heating pipeline, and a third heat exchange member and a heat dissipation member disposed on the heating pipeline, the third heat exchange member is configured to absorb heat released by the first heat exchange member, the heat dissipation member is configured to release heat absorbed by the third heat exchange member, the refrigerating unit includes a refrigerating circulation loop and a defrosting branch, the refrigeration cycle loop is sequentially provided with a fourth heat exchange component, a refrigeration heat exchanger and a refrigeration pump, the fourth heat exchange component is arranged to be capable of absorbing the cold energy released by the second heat exchange component, the refrigeration heat exchanger is arranged to be capable of releasing the heat absorbed by the fourth heat exchange component, the defrosting branch is connected with the refrigeration heat exchanger in parallel, the defrosting branch is provided with a defrosting pump, and part of pipelines of the defrosting branch can exchange heat with the heater, so that the temperature of the secondary refrigerant in the defrosting branch is increased, and defrosting is realized.
In the preferable technical scheme of the multi-stage heat exchange system, the two ends of the defrosting branch are both provided with defrosting valves so as to control the on-off state of the defrosting branch.
In the preferable technical scheme of the multistage heat exchange system, the refrigeration cycle loop is further provided with two refrigeration valves, and the two refrigeration valves are respectively located at two ends of the refrigeration heat exchanger so that the refrigeration heat exchanger can be selectively communicated with the defrosting branch or the refrigeration cycle loop.
In the preferable technical scheme of the multistage heat exchange system, the refrigeration heat exchanger is a fin heat exchanger.
In the preferable technical scheme of the multistage heat exchange system, the distance between two adjacent fins of the fin heat exchanger is larger than 4 mm.
In a preferred technical solution of the above multistage heat exchange system, the first heat exchange member and the third heat exchange member are both disposed in a first heat exchange shell, and a heat exchange medium is filled in the first heat exchange shell to promote heat exchange between the first heat exchange member and the third heat exchange member; and/or the second heat exchange member and the fourth heat exchange member are arranged in a second heat exchange shell, and a heat exchange medium is filled in the second heat exchange shell to promote the heat exchange of the second heat exchange member and the fourth heat exchange member.
In the preferable technical scheme of the multistage heat exchange system, the heating unit further comprises a heating pump arranged on the heating pipeline, the heating pump is positioned at the upstream of the third heat exchange component, and the heating pipeline is connected end to form a heating circulation loop.
In a preferred technical scheme of the multistage heat exchange system, the heat dissipation member is a heating heat exchanger, and the heating heat exchanger is used for providing hot air and/or hot water.
In a preferred technical solution of the multistage heat exchange system, the heat dissipation member is a cooling tower.
In a preferred technical scheme of the multistage heat exchange system, the refrigeration pump includes a first refrigeration pump and a second refrigeration pump which are arranged in parallel, and/or the heating pump includes a first heating pump and a second heating pump which are arranged in parallel.
As can be understood by those skilled in the art, in the technical solution of the present invention, the multistage heat exchange system of the present invention includes a heat exchanger unit, a heating unit and a refrigerating unit, the heat exchanger unit includes a refrigerant circulation loop, and a first heat exchange member, a throttling member, a second heat exchange member and a compressor which are sequentially disposed on the refrigerant circulation loop, the heating unit includes a heating pipeline, and a third heat exchange member and a heat dissipation member which are disposed on the heating pipeline, the third heat exchange member is configured to absorb heat released by the first heat exchange member, the heat dissipation member is configured to release heat absorbed by the third heat exchange member, the refrigerating unit includes a refrigerating circulation loop and a defrosting branch, a fourth heat exchange member, a refrigerating heat exchanger and a refrigerating pump are sequentially disposed on the refrigerating circulation loop, the fourth heat exchange member is configured to absorb cold released by the second heat exchange member, the refrigeration heat exchanger is arranged to release the heat absorbed by the fourth heat exchange component, the defrosting branch is arranged in parallel with the refrigeration heat exchanger, a defrosting pump is arranged on the defrosting branch, and a part of pipelines of the defrosting branch can exchange heat with the heater to increase the temperature of the secondary refrigerant in the defrosting branch and accordingly defrost. The heating unit and the refrigerating unit are respectively arranged on the two sides of the heat exchange unit, so that heat involved in the heat exchange process of the first heat exchange member and the second heat exchange member of the heat exchange unit can be effectively utilized, the heat exchange efficiency of the multistage heat exchange system is effectively improved, the defrosting branch is additionally arranged, the frosting problem of the refrigerating heat exchanger can be effectively solved through simple structural change, the heat exchange efficiency of the multistage heat exchange system is further effectively improved, and the multistage heat exchange system can be effectively ensured to constantly keep a high-efficiency operation state in a low-temperature high-humidity environment.
Drawings
FIG. 1 is a schematic overall structural view of a first preferred embodiment of the multistage heat exchange system of the present invention;
FIG. 2 is a schematic overall structure diagram of a second preferred embodiment of the multistage heat exchange system of the present invention;
reference numerals:
11. a heat exchanger unit; 111. a first heat exchange member; 112. a throttling member; 113. a second heat exchange member; 114. a compressor;
12. a heating unit; 121. a third heat exchange member; 122. a heat pump; 1221. a first heat pump; 1222. a second heat pump; 123', a heating heat exchanger; 123 ", a cooling tower; 124. a heating fan;
13. a refrigeration unit; 131. a fourth heat exchange member; 132. a refrigeration heat exchanger; 133. a refrigeration pump; 1331. a first refrigeration pump; 1332. a second refrigeration pump; 134. a defrost pump; 135. a heater; 1361. a first defrost valve; 1362. a second defrost valve; 1371. a first refrigeration valve; 1372. a second refrigeration valve; 138. a refrigeration fan;
14. a first heat exchange housing;
15. a second heat exchange housing.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring first to fig. 1, there is shown a schematic view of the overall configuration of a first preferred embodiment of the multistage heat exchange system of the present invention. As shown in fig. 1, in a first preferred embodiment of the present invention, the multistage heat exchange system of the present invention includes a heat exchanger unit 11, a heating unit 12, and a refrigerating unit 13, wherein the heat exchanger unit 11 includes a refrigerant circulation circuit, and a first heat exchange member 111, a throttling member 112, a second heat exchange member 113, and a compressor 114 sequentially disposed on the refrigerant circulation circuit, a refrigerant flows through the refrigerant circulation circuit, the refrigerant circulates through the refrigerant circulation circuit and flows through the first heat exchange member 111, the throttling member 112, the second heat exchange member 113, and the compressor 114, during circulation, the first heat exchange member 111 serves as a condenser, the second heat exchange member 113 serves as an evaporator, a gaseous refrigerant flowing through the first heat exchange member 111 continuously condenses and releases heat to continuously convert into a gas-liquid refrigerant, the gas-liquid refrigerant further liquefies through the throttling member 112 to convert into a liquid refrigerant, the liquid refrigerant passes through the second heat exchange member 113 again and is evaporated to absorb external heat, thereby being converted into a gaseous refrigerant, the low-temperature and low-pressure gaseous refrigerant flowing out of the second heat exchange member 113 enters the compressor 114, and finally, the gaseous refrigerant is compressed to become a high-temperature and high-pressure gaseous refrigerant and then flows into the first heat exchange member 111 to realize circulation.
Based on the structural arrangement of the refrigerant circulation circuit, the first heat exchange member 111 continuously releases heat and the second heat exchange member 113 continuously absorbs heat during the continuous circulation of the refrigerant. In view of this, in the present invention, the heating unit 12 is disposed at a side close to the first heat exchange member 111, and the refrigerating unit 13 is disposed at a side close to the second heat exchange member 113, so that heat released by the refrigerant in the first heat exchange member 111 can be reasonably utilized by the heating unit 12, and cold released by the refrigerant in the second heat exchange member 113 can be reasonably utilized by the refrigerating unit 13, so that both heat and cold involved in the heat exchange process of the refrigerant can be effectively utilized, and further, the heat exchange efficiency of the multistage heat exchange system is effectively improved.
It should be noted that, the present invention does not limit the specific structural composition of the heat exchanger unit, that is, although the heat exchanger unit 11 in the preferred embodiment only includes a refrigerant circulation loop, and the first heat exchange member 111, the throttling member 112, the second heat exchange member 113 and the compressor 114 which are sequentially arranged on the refrigerant circulation loop, this is not a restrictive structural configuration, and a technician may add other elements to assist the heat exchange process according to the actual use requirement. Meanwhile, the invention also does not limit the specific types of the first heat exchange member 111, the throttling member 112, the second heat exchange member 113 and the compressor 114, and the skilled person can select the heat exchange member according to the actual use requirement, for example, the first heat exchange member 111 may be a water-cooled condenser or an air-cooled condenser; the throttling member 112 may be either an electronic expansion valve or a capillary tube; the second heat exchange member 113 may be a fin type evaporator or a plate type evaporator; the compressor 114 may be either a centrifugal compressor or a screw compressor. In addition, the present invention does not limit the type of the refrigerant circulating in the refrigerant circulation circuit, and the technician can select the refrigerant according to the actual use requirement. The above-described changes in the specific structure are not departed from the basic principle of the present invention and are within the scope of the present invention.
With continued reference to fig. 1, in the first preferred embodiment of the present invention, the heating unit 12 includes a heating circulation loop, and a third heat exchange member 121, a heating pump 122 and a heating heat exchanger 123' which are sequentially disposed on the heating circulation loop, and the heat exchange medium flowing through the heating circulation loop is water. It should be noted that, although the heat exchange medium flowing through the heating circulation loop in the preferred embodiment is water, this is not limitative, and a skilled person may set the type of the heat exchange medium according to actual use requirements, as long as the heat exchange function is achieved. Specifically, the third heat exchange member 121 is disposed close to the first heat exchange member 111, so that water circulating in the third heat exchange member 121 can absorb heat released by the refrigerant in the first heat exchange member 111 to realize temperature rise, and the heated water flows into the heating heat exchanger 123' under the driving action of the heating pump 122; and a heating fan 124 is further disposed near the heating heat exchanger 123 ', and the heating fan 124 drives ambient air to blow out after flowing through the heating heat exchanger 123' for heating so as to provide hot air, so that the hot air is introduced into a space to be heated, thereby realizing a heating function. Meanwhile, a technician can also set a water intake on the heating heat exchanger 123 'to provide hot water, and when a user needs to use hot water, the hot water is led out to be directly used, so that hot air and hot water are provided through the heating heat exchanger 123', heat recycling is realized, and the utilization rate of heat is further effectively improved.
In addition, as a preferable arrangement manner of the heating pump 122, the heating pump 122 includes a first heating pump 1221 and a second heating pump 1222 that are arranged in parallel, and during the daily use, the first heating pump 1221 and the second heating pump 1222 may be used alternately, so that the first heating pump 1221 and the second heating pump 1222 may have a rest alternately, so as to reduce the damage of the heating pump caused by the hot water as much as possible, thereby effectively prolonging the service life of the first heating pump 1221 and the second heating pump 1222, and further effectively improving the reliability of the heating unit 12. When one of the first heating pump 1221 and the second heating pump 1222 is out of order, the other one of the first heating pump 1221 and the second heating pump 1222 can be directly replaced, so that the normal operation of the heating unit 12 is effectively ensured, and the reliability of the multi-stage heat exchange system is greatly improved. Of course, this is only a preferred arrangement, and the skilled person can set the number and the type of the heat pumps 122 according to the actual use requirement.
It can be understood by those skilled in the art that although the heating heat exchanger 123 ' described in the preferred embodiment can provide both hot wind and hot water, those skilled in the art can adjust the structure of the heating heat exchanger 123 ' according to actual use requirements so that the heating heat exchanger 123 ' can only provide hot wind or hot water; in addition, the invention does not limit the specific structure of the heating heat exchanger 123', and technicians can set the structure according to actual use requirements; for example, the heating heat exchanger 123' may be a fin heat exchanger, or may be only a section of heat exchange pipeline bent back and forth.
It should be noted that, although the heating pipes used in the heating unit 12 described in the preferred embodiment are connected end to form a heating circulation loop, this is only a preferred arrangement, and only one section of heating pipe may be arranged in the heating unit 12, and one end of the heating pipe is directly connected to a water source to continuously provide water for heating; the present invention does not limit the specific structural configuration of the heating unit 12 and the specific type of the third heat exchange member 121, and a technician may adjust the configuration according to the actual use requirement as long as the heating unit 12 can absorb the heat released by the first heat exchange member 111 through the third heat exchange member 121. Changes in this detailed construction can be made without departing from the basic principles of the invention and are intended to be within the scope of the invention.
As a preferred embodiment, in order to effectively improve the heat exchange efficiency of the first heat exchange member 111 and the third heat exchange member 121, the multistage heat exchange system of the present invention further includes a first heat exchange housing 14, the first heat exchange member 111 and the third heat exchange member 121 are both disposed in the first heat exchange housing 14, and a heat exchange medium is further disposed in the first heat exchange housing 14, so that the first heat exchange member 111 and the third heat exchange member 121 can realize efficient heat exchange through the heat exchange medium in the first heat exchange housing 14, thereby effectively improving the heat exchange efficiency of the first heat exchange member 111 and the third heat exchange member 121, and further effectively avoiding heat dissipation. It should be noted that, the present invention does not limit any specific structure of the first heat exchange shell 14, and a skilled person can set the specific structure according to actual use requirements, as long as the first heat exchange shell 14 can accommodate the first heat exchange member 111 and the third heat exchange member 121 at the same time and can be filled with heat exchange media; for example, the first heat exchange housing 14 may be a rectangular parallelepiped box structure filled with a heat exchange medium, and the first heat exchange member 111 and the third heat exchange member 121 are both provided in the box structure.
Further, with reference to fig. 1, in the preferred embodiment, the refrigeration unit 13 includes a refrigeration cycle circuit and a defrosting branch, both of which are coolant, and the coolant does not realize refrigeration through changing its gas-liquid state in the process of circulating flow, but only realizes refrigeration through changing its temperature, so that the refrigeration unit has higher safety, and the multistage heat exchange system can be widely applied. It should be noted that the present invention does not limit the specific type of the coolant, and the skilled person can set the coolant according to the actual use requirement. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Specifically, in the first preferred embodiment, a fourth heat exchange member 131, a refrigeration heat exchanger 132 and a refrigeration pump 133 are sequentially disposed on the refrigeration cycle loop, and the secondary refrigerant realizes circulating flow through the refrigeration cycle loop to perform continuous refrigeration, wherein the fourth heat exchange member 131 is disposed near the second heat exchange member 113, so that the refrigerant flowing in the second heat exchange member 113 can continuously absorb heat from the secondary refrigerant flowing in the fourth heat exchange member 131 during evaporation, that is, the secondary refrigerant flowing in the fourth heat exchange member 131 can absorb cold released by the refrigerant in the second heat exchange member 113 to achieve temperature reduction, the secondary refrigerant after temperature reduction flows into the refrigeration heat exchanger 132 under the driving action of the refrigeration pump 133, and a refrigeration fan 138 is further disposed near the refrigeration heat exchanger 132, and when the refrigeration fan 138 operates, the ambient air is driven to flow through the refrigeration heat exchanger 132 to perform temperature reduction and then blown out to provide cold air, the refrigeration effect can be realized by introducing cold air into the space to be refrigerated. For example, a room to be cooled, or a freezer to be frozen, etc., the present invention does not impose any limitation on a space into which cold air is introduced.
As a preferred embodiment, in order to effectively improve the heat exchange efficiency of the second heat exchange member 113 and the fourth heat exchange member 131, the multistage heat exchange system of the present invention further includes a second heat exchange housing 15, the second heat exchange member 113 and the fourth heat exchange member 131 are both disposed in the second heat exchange housing 15, and a heat exchange medium is further disposed in the second heat exchange housing 15, so that the second heat exchange member 113 and the fourth heat exchange member 131 can realize efficient heat exchange through the heat exchange medium in the second heat exchange housing 15, thereby effectively improving the heat exchange efficiency of the second heat exchange member 113 and the fourth heat exchange member 131, and further effectively avoiding heat dissipation. It should be noted that, the present invention does not limit the specific structure of the second heat exchange shell 15, and a technician can set the specific structure according to the actual use requirement, as long as the second heat exchange shell 15 can accommodate the second heat exchange member 113 and the fourth heat exchange member 131 at the same time and can be filled with the heat exchange medium; for example, the second heat exchange housing 15 may be a rectangular parallelepiped box structure filled with a heat exchange medium, and the second heat exchange member 113 and the fourth heat exchange member 131 are both provided in the box structure.
In addition, it should be noted that the present invention does not limit the specific structure of the refrigeration heat exchanger 132, and the technician can set the configuration according to the actual use requirement. As a preferred embodiment, the refrigeration heat exchanger 132 is configured as a fin heat exchanger, so as to effectively improve the heat exchange efficiency between the coolant and the air; further preferably, the fin heat exchanger selects the heat exchanger with the large fin spacing that the spacing between two adjacent fins is greater than 4mm, so that the liquid attached to the surface of the fin can be discharged in time, even if the surface of the fin has generated frost, the frost can also drop rapidly as long as the fin slightly heats up, and further the heat exchange efficiency of the refrigeration heat exchanger 132 is effectively ensured.
As a preferable arrangement manner of the refrigeration pump 133, the refrigeration pump 133 includes a first refrigeration pump 1331 and a second refrigeration pump 1332 that are arranged in parallel, and in the process of daily use, the first refrigeration pump 1331 and the second refrigeration pump 1332 can be used alternately, so that the first refrigeration pump 1331 and the second refrigeration pump 1332 can have a rest alternately, so as to reduce the damage of the low-temperature coolant to the refrigeration pumps as much as possible, thereby effectively prolonging the service lives of the first refrigeration pump 1331 and the second refrigeration pump 1332, and further effectively improving the reliability of the refrigeration unit 13. When one of the first refrigeration pump 1331 and the second refrigeration pump 1332 fails, the other of the first refrigeration pump 1331 and the second refrigeration pump 1332 can be directly replaced, so that the normal operation of the refrigeration unit 13 is effectively ensured, and the reliability of the multistage heat exchange system is greatly improved. Of course, this is only a preferred arrangement, and the technician can set the number and kinds of the refrigeration pumps 133 according to the actual use requirement.
Further, the defrosting branch is connected in parallel with the refrigeration heat exchanger 132, a defrosting pump 134 is disposed on the defrosting branch, and a part of pipelines of the defrosting branch are disposed near the heater 135, so that the heater 135 can rapidly heat the coolant in the defrosting branch to raise the temperature of the coolant, and the heated coolant is conveyed to the refrigeration heat exchanger 132, thereby effectively achieving defrosting. By additionally arranging the defrosting branch, the refrigerating unit 13 effectively solves the problem that the surface of the refrigerating heat exchanger 132 is easy to frost only through simple structural change, so that the heat exchange efficiency of the multistage heat exchange system is further effectively improved, and the multistage heat exchange system can be effectively ensured to be in a high-efficiency operation state constantly in a low-temperature and high-humidity environment. It should be noted that the present invention does not limit the specific types of the defrosting pump 134 and the heater 135, and the skilled person can set the types according to the actual use requirement. As a preferred embodiment, the heater 135 includes a casing and a heating wire disposed in the casing, and a portion of the defrosting branch is disposed in the casing in a back-and-forth bending manner, so as to effectively increase the heating speed of the coolant by the heater 135.
In addition, in the preferred embodiment, a first defrost valve 1361 and a second defrost valve 1362 are further disposed at two ends of the defrost branch, and the on-off state of the defrost branch can be controlled by controlling the on-off states of the first defrost valve 1361 and the second defrost valve 1362, so that the defrost branch can selectively communicate with the refrigeration cycle circuit. It should be noted that, the present invention does not limit the specific types of the first defrosting valve 1361 and the second defrosting valve 1362, and the technician can set the defrosting branch according to the actual use requirement, as long as the on-off state of the defrosting branch can be controlled, and the technician can set the manner of controlling the on-off state of the defrosting branch according to the actual use requirement, or even the technician can directly control the on-off state of the heater 135 to control the defrosting function. Meanwhile, a first refrigeration valve 1371 and a second refrigeration valve 1372 are arranged on the refrigeration cycle loop, and the first refrigeration valve 1371 and the second refrigeration valve 1372 are respectively positioned at the upper end and the lower end of the refrigeration heat exchanger 132, so that the refrigeration heat exchanger 132 can be selectively communicated with the defrosting branch or the refrigeration cycle loop; of course, this arrangement is not limiting, and the technician can adjust the arrangement according to the actual use requirement; for example, as another preferred embodiment, the technician may also replace the first defrost valve 1361 and the first refrigeration valve 1371 and the second defrost valve 1362 and the second refrigeration valve 1372 with two three-way valves, respectively, thereby effectively achieving the effect of selective communication. Changes in this detailed construction can be made without departing from the basic principles of the invention and are intended to be within the scope of the invention.
Based on the above structural arrangement, when the refrigeration heat exchanger 132 needs defrosting, the first defrosting valve 1361 and the second defrosting valve 1362 are controlled to be opened and the first refrigeration valve 1371 and the second refrigeration valve 1372 are controlled to be closed, in this case, the secondary refrigerant only circulates between the refrigeration heat exchanger 132 and the defrosting branch, so that the cycle period and path of the secondary refrigerant are effectively shortened, and the defrosting efficiency of the refrigeration unit 13 is effectively improved; when the refrigeration heat exchanger 132 does not need defrosting, the first defrosting valve 1361 and the second defrosting valve 1362 are controlled to be closed and the first refrigeration valve 1371 and the second refrigeration valve 1372 are controlled to be opened, and in this case, the coolant flows in a circulating manner only through the refrigeration cycle loop, so that unnecessary flow paths are effectively saved, and the refrigeration efficiency of the refrigeration unit 13 is effectively ensured.
Referring next to fig. 2, there is shown a schematic view of the overall configuration of a second preferred embodiment of the multi-stage heat exchange system of the present invention. As shown in fig. 2, the cooling tower 123 ″ is used as a heat dissipation member in the second preferred embodiment instead of the heating heat exchanger 123' in the first preferred embodiment, and the rest of the structural configuration is the same as that in the first preferred embodiment, and therefore, the description thereof is omitted. In the second preferred embodiment, the cooling tower 123 "can release the heat absorbed by the third heat exchange member 121, the hot water flowing out of the third heat exchange member 121 can enter the cooling tower 123" in a spraying manner so as to achieve the first temperature reduction, after entering the cooling tower 123 ", the cooling tower 123" is provided with a plurality of cooling holes, the hot water stored in the cooling tower 123 "can exchange heat with the outside air continuously so as to achieve the temperature reduction, and the cooled water enters the heating circulation loop again through an outlet arranged at the bottom of the cooling tower 123" to continue to circulate. It should be noted that the present invention does not limit the specific structure of the cooling tower 123 ", and the skilled person can set the cooling tower 123" according to the actual use requirement as long as the cooling tower 123 "can perform the cooling effect on the hot water.
Finally, it should be noted that, although the above two preferred embodiments are described only when the heat dissipation members are the heating heat exchanger 123' and the cooling tower 123 ", this is not a limitation to the heat dissipation members, and the skilled person can select the specific type of the heat dissipation members according to the actual use requirement.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A multi-stage heat exchange system is characterized by comprising a heat exchange unit, a heating unit and a refrigerating unit,
the heat exchange unit comprises a refrigerant circulation loop, a first heat exchange member, a throttling member, a second heat exchange member and a compressor which are sequentially arranged on the refrigerant circulation loop,
the heating unit comprises a heating pipeline, and a third heat exchange component and a heat dissipation component which are arranged on the heating pipeline, wherein the third heat exchange component is arranged to absorb the heat released by the first heat exchange component, the heat dissipation component is arranged to release the heat absorbed by the third heat exchange component,
the refrigerating unit comprises a refrigerating circulation loop and a defrosting branch,
a fourth heat exchange component, a refrigeration heat exchanger and a refrigeration pump are sequentially arranged on the refrigeration cycle loop, the fourth heat exchange component is arranged to be capable of absorbing the cold energy released by the second heat exchange component, the refrigeration heat exchanger is arranged to be capable of releasing the heat absorbed by the fourth heat exchange component,
the defrosting branch circuit is connected with the refrigeration heat exchanger in parallel, a defrosting pump is arranged on the defrosting branch circuit, and a part of pipelines of the defrosting branch circuit can exchange heat with the heater, so that the temperature of the secondary refrigerant in the defrosting branch circuit is increased, and defrosting is realized.
2. The multi-stage heat exchange system according to claim 1, wherein a defrosting valve is arranged at each end of the defrosting branch so as to control the on-off state of the defrosting branch.
3. The multi-stage heat exchange system of claim 2, wherein two refrigeration valves are further provided on the refrigeration cycle loop,
the two refrigeration valves are respectively positioned at two ends of the refrigeration heat exchanger so that the refrigeration heat exchanger can be selectively communicated with the defrosting branch or the refrigeration circulation loop.
4. The multi-stage heat exchange system of claim 1, wherein the refrigeration heat exchanger is a fin heat exchanger.
5. The multi-stage heat exchange system according to claim 4, wherein the spacing between two adjacent fins of the fin heat exchanger is greater than 4 mm.
6. The multi-stage heat exchange system of claim 1, wherein the first heat exchange member and the third heat exchange member are both disposed in a first heat exchange shell, and a heat exchange medium is filled in the first heat exchange shell to promote heat exchange between the first heat exchange member and the third heat exchange member; and/or
The second heat exchange member and the fourth heat exchange member are both arranged in a second heat exchange shell, and a heat exchange medium is filled in the second heat exchange shell to promote the second heat exchange member and the fourth heat exchange member to exchange heat.
7. The multi-stage heat exchange system according to any one of claims 1 to 6, wherein the heating unit further comprises a heating pump disposed on the heating pipeline,
the heating pump is positioned at the upstream of the third heat exchange component, and the heating pipelines are connected end to form a heating circulation loop.
8. The multi-stage heat exchange system according to claim 7, wherein the heat dissipation member is a heating heat exchanger for supplying hot wind and/or hot water.
9. The multi-stage heat exchange system of claim 7, wherein the heat sink member is a cooling tower.
10. The multi-stage heat exchange system of claim 7, wherein the refrigeration pump comprises a first refrigeration pump and a second refrigeration pump arranged in parallel, and/or
The heating pump comprises a first heating pump and a second heating pump which are arranged in parallel.
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| CN202011051642.6A CN112303948A (en) | 2020-09-29 | 2020-09-29 | Multistage heat exchange system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011051642.6A CN112303948A (en) | 2020-09-29 | 2020-09-29 | Multistage heat exchange system |
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| CN112303948A true CN112303948A (en) | 2021-02-02 |
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| CN211316644U (en) * | 2019-12-07 | 2020-08-21 | 辽宁科池能源科技有限公司 | High-efficient heating device of low temperature environment |
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|---|---|---|---|---|
| CN101608844A (en) * | 2009-07-03 | 2009-12-23 | 苏州大学 | A kind of all-in-one machine integrated with heat and cold sources |
| CN103075848A (en) * | 2013-01-21 | 2013-05-01 | 深圳市庄合地能产业科技有限公司 | Cold and heat balancing system combining lithium bromide set and refrigeration house |
| EP3043127A1 (en) * | 2015-01-12 | 2016-07-13 | LG Electronics Inc. | Air conditioner and control method thereof |
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