CN106885389A - Refrigerating plant - Google Patents
Refrigerating plant Download PDFInfo
- Publication number
- CN106885389A CN106885389A CN201710184719.9A CN201710184719A CN106885389A CN 106885389 A CN106885389 A CN 106885389A CN 201710184719 A CN201710184719 A CN 201710184719A CN 106885389 A CN106885389 A CN 106885389A
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- Prior art keywords
- compressor
- port
- refrigerating plant
- heat exchanger
- valve
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- 238000001704 evaporation Methods 0.000 claims abstract description 63
- 230000008020 evaporation Effects 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000002386 leaching Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 241000196324 Embryophyta Species 0.000 description 53
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a kind of refrigerating plant, the refrigerating plant includes：First compressor, the second compressor, First Heat Exchanger, the second heat exchanger and flash evaporation；The flash evaporation is connected between one end of one end of the First Heat Exchanger and second heat exchanger, and the exhaust port of the flash evaporation is connected with the air entry of first compressor；The other end of the First Heat Exchanger is connected with the exhaust outlet of first compressor and is optionally connected with the exhaust outlet of second compressor；The other end of second heat exchanger is connected with the air entry of second compressor and is optionally connected with the air entry of first compressor；The exhaust outlet of second compressor is optionally connected with the other end of the First Heat Exchanger.The refrigerating plant of the embodiment of the present invention, with multiple-working mode, to adapt to various burden requirements, range of operation is wide, and the actual motion efficiency of refrigerating plant is high, good energy-conserving effect.
Description
Technical field
The invention belongs to refrigeration technology field, in particular to a kind of refrigerating plant.
Background technology
In order to improve stability of the refrigerating plant under ultra-low temperature surroundings, the refrigerating plant of a part have selected two stages of compression
System, it has the disadvantage that integrated application efficiency is low.Inventor's research finds, in correlation technique, two-stage compression system cannot be according to negative
Lotus situation selects mode of operation, causes efficiency low, and the major reason for influenceing efficiency is that running environment is complicated and changeable, and two-stage pressure
The compressor cylinder of the high-pressure side of contracting and low-pressure side is than fixing, and two-stage compression system is under the relatively low operating mode of pressure ratio, and efficiency is not high.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.Therefore, the present invention proposes a kind of, institute
State
Refrigerating plant according to embodiments of the present invention, including：First compressor, the second compressor, First Heat Exchanger, second
Heat exchanger and flash evaporation；The flash evaporation be connected to one end of the First Heat Exchanger and second heat exchanger one end it
Between, and the exhaust port of the flash evaporation is connected with the air entry of first compressor；The other end of the First Heat Exchanger
It is connected with the exhaust outlet of first compressor and is optionally connected with the exhaust outlet of second compressor；Described second
The other end of heat exchanger is connected and alternative with the air entry of first compressor with the air entry of second compressor
Ground is connected；The exhaust outlet of second compressor is optionally connected with the other end of the First Heat Exchanger.
Refrigerating plant according to embodiments of the present invention, with multiple-working mode, to adapt to various burden requirements, runs model
Enclose wide, and the actual motion efficiency of refrigerating plant is high, good energy-conserving effect.
Refrigerating plant according to an embodiment of the invention, also includes：Stop valve, the stop valve is connected to described first
Between the other end of the air entry of compressor and second heat exchanger, and air entry positioned at first compressor with
Between the air entry of second compressor, wherein when second compressor is closed, the stop valve is in connected state,
In second compressor operating, the stop valve is in dissengaged positions.
Specifically, the stop valve is magnetic valve.
Refrigerating plant according to an embodiment of the invention, also includes：Switching valve, the switching valve includes valve port a, valve port
B, valve port c, the valve port a are connected with the exhaust outlet of second compressor, the air-breathing of the valve port b and first compressor
Mouthful be connected, the valve port c is connected with the other end of the First Heat Exchanger, the valve port a optionally with the valve
The c connections of mouth b or described valve ports.
Alternatively, the valve port b be connected with the flash evaporation and the exhaust port by the flash evaporation with it is described
The air entry connection of the first compressor.
Further, there is the flash evaporation port d, the port d to be immersed under the refrigerant liquid level in the flash evaporation.
Alternatively, the valve port b is directly connected with the air entry of first compressor.
Alternatively, described refrigerating plant also includes：Blending tank, the exhaust port of the flash evaporation, the valve port
B, the other end of second heat exchanger are connected by the blending tank with the air entry of first compressor.
Refrigerating plant according to an embodiment of the invention, the flash evaporation has a port e and port f, the port e and
The port f is submerged under the refrigerant liquid level in the flash evaporation, and the port e and described the one of second heat exchanger
End is connected, and the port f is connected with described one end of the First Heat Exchanger.
Refrigerating plant according to an embodiment of the invention, the exhaust port of the flash evaporation and the described first compression
The check element from the flash evaporation to the first compressor one-way conduction is provided between the air entry of machine.
Refrigerating plant according to an embodiment of the invention, also includes：Control valve, the control valve has valve port h, valve port
I, valve port j, valve port k, the valve port h be connected with the exhaust outlet of first compressor and with the exhaust outlet of second compressor
Optionally it is connected, the valve port i is connected with the other end of first heat exchange unit, the valve port j and described
The other end of two heat exchange units is connected, and the valve port k is connected and with described first with the air entry of second compressor
The air entry of compressor is optionally connected.
Refrigerating plant according to an embodiment of the invention, also includes：It is arranged on the first temperature on the First Heat Exchanger
Degree sensor and the second temperature sensor being arranged at the air intake of second heat exchanger, in a heating mode, T2≤t2, and
During T1 >=t1, the exhaust outlet of second compressor is connected with the air entry of first compressor, wherein, T1 is described first
The detected value of temperature sensor, T2 is the detected value of the second temperature sensor, and t1 is the first preset temperature value, and t2 is second
Preset temperature value.
Preferably, meet：T1 >=45 DEG C, t2≤- 5 DEG C.
Refrigerating plant according to an embodiment of the invention, first compressor and second compressor are constant speed
Compressor, meets：0.20≤V1/V2≤0.85, V1 is the delivery space of first compressor, and V2 is second compressor
Delivery space.
Refrigerating plant according to an embodiment of the invention, first compressor is constant speed compressor, second pressure
Contracting machine is frequency-changeable compressor, is met：V1≤V25, V1 are the delivery space of first compressor, and V2 is second compressor
Delivery space.
Refrigerating plant according to an embodiment of the invention, first compressor is constant speed compressor, second pressure
Contracting machine is constant speed double-cylinder variable-capacity compressor, is met：0.20≤V1/V2≤0.70,0.05≤V1/V3≤0.35, V1 is described the
The delivery space of one compressor, V2 is the minimum delivery space of second compressor, and V3 is the maximum of second compressor
Delivery space.
Refrigerating plant according to an embodiment of the invention, first compressor is constant speed compressor, second pressure
Contracting machine is constant speed double-cylinder variable-capacity compressor, is met：0.50≤V1/V2≤0.85,0.25≤V1/V3≤0.55, V1 is described the
The delivery space of one compressor, V2 is the minimum delivery space of second compressor, and V3 is the maximum of second compressor
Delivery space.
Refrigerating plant according to an embodiment of the invention, first compressor is constant speed double-cylinder variable-capacity compressor, institute
The second compressor is stated for frequency conversion positive displacement compressor, is met：V1≤V3, V2≤V4, V1 are the minimum exhaust of first compressor
Volume, V2 is the maximum delivery space of first compressor, and V3 is the minimum delivery space of second compressor, and V4 is institute
State the maximum delivery space of the second compressor.
Refrigerating plant according to an embodiment of the invention, the refrigerating plant has the first mode of operation, and described
Under first mode of operation, first compressor operating, second compressor is closed, the air entry of first compressor with
The other end connection of second heat exchanger.
Refrigerating plant according to an embodiment of the invention, the refrigerating plant has the second mode of operation, and described
Under second mode of operation, second compressor operating, first compressor is closed, the air entry of first compressor with
The other end cut-out of second heat exchanger, the exhaust outlet of second compressor is described another with the First Heat Exchanger
One end connects.
Refrigerating plant according to an embodiment of the invention, the refrigerating plant has the 3rd mode of operation, and described
Under 3rd mode of operation, first compressor and second compressor run, the air entry of first compressor with
The other end cut-out of second heat exchanger, the air entry of the exhaust outlet of second compressor and first compressor
Connection.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the structural representation of the refrigerating plant according to an embodiment of the present invention；
Fig. 2 is the structural representation of the refrigerating plant according to another kind embodiment of the invention；
Fig. 3 is the structural representation of the refrigerating plant according to another embodiment of the invention.
Reference：
Refrigerating plant 100,
First compressor 1, the second compressor 2, First Heat Exchanger 3, the second heat exchanger 4, flash evaporation 5, stop valve 6, switching
Valve 7, controls valve 8, check element 9, blending tank 10, first throttle element 11, the second restricting element 12, the first temperature sensor
13, second temperature sensor 14.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that define " first ", the feature of " second " can be expressed or hidden
Include one or more this feature containing ground.In the description of the invention, unless otherwise indicated, " multiple " is meant that two
Or two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Refrigerating plant 100 according to embodiments of the present invention is described below with reference to Fig. 1-Fig. 3.
As shown in Figure 1-Figure 3, refrigerating plant according to an embodiment of the invention 100 includes：First compressor 1, second
Compressor 2, First Heat Exchanger 3, the second heat exchanger 4 and flash evaporation 5.
Wherein, flash evaporation 5 is connected to one end of First Heat Exchanger 3 (for example, the left end in Fig. 1-Fig. 3) and the second heat exchanger
Between 4 one end (for example, the left end in Fig. 1-Fig. 3).Flash evaporation 5 is used to for the refrigerant in two-phase section to carry out gas-liquid separation,
Such as flash evaporation 5 can have port e and port f, port e and port f to be submerged under the refrigerant liquid level in flash evaporation 5, and
Port e is connected with one end of the second heat exchanger 4, and port f is connected with one end of First Heat Exchanger 3.
Further, first throttle element 11 is provided between flash evaporation 5 and First Heat Exchanger 3, flash evaporation 5 and second exchanges heat
The second restricting element 12 is provided between device 4, the restricting element 12 of first throttle element 11 and second is used in refrigerating plant 100
Refrigerant carries out reducing pressure by regulating flow.
The exhaust port g of flash evaporation 5 is connected with the air entry of the first compressor 1, has gas-phase space, row in flash evaporation 5
Gas port g can be located at the top of flash evaporation 5, and be connected with gas-phase space, and the refrigerant steam in flash evaporation 5 can be by exhaust
Port g is connected with the air entry of the first compressor 1, can between the air entry of the exhaust port g of flash evaporation 5 and the first compressor 1
To be provided with check element 9, check element 9 from the one-way conduction of the compressor of flash evaporation 5 to the first 1, to prevent refrigerant countercurrently.
The other end (for example, the right-hand member in Fig. 1-Fig. 3) of First Heat Exchanger 3 is connected with the exhaust outlet of the first compressor 1, and
The above-mentioned other end of First Heat Exchanger 3 is optionally connected with the exhaust outlet of the second compressor 2, the second heat exchanger 4 it is another
End (for example, the right-hand member in Fig. 1-Fig. 3) be connected with the air entry of the second compressor 2, and the second heat exchanger 4 the other end and first
The air entry of compressor 1 is optionally connected, and the air entry of the exhaust outlet of the second compressor 2 and the first compressor 1 may be selected
Property ground be connected, can be joined directly together (example when the exhaust outlet of the second compressor 2 is connected with the air entry of the first compressor 1
Such as, Fig. 2), or indirectly it is connected (for example, Fig. 1 and Fig. 3).
First compressor 1 is selectively operable or closes, and the second compressor 2 is selectively operable or closes.
It is understood that running status and the first compressor 1 by controlling the first compressor 1 and the second compressor 2
With the second compressor 2 and the annexation of miscellaneous part, the mode of operation of refrigerating plant 100 can be adjusted, so as to according to load
Situation, selects operational mode.
Refrigerating plant 100 according to embodiments of the present invention, with multiple-working mode, to adapt to various burden requirements, fortune
Line range is wide, and the actual motion efficiency of refrigerating plant 100 is high, good energy-conserving effect.
Reference picture 1- Fig. 3, refrigerating plant 100 can also include：Stop valve 6, stop valve 6 is connected to the first compressor 1
Between the other end of air entry and the second heat exchanger 4, and stop valve 6 is located at the air entry and the second compressor 2 of the first compressor 1
Air entry between.Wherein when the second compressor 2 is closed, stop valve 6 is in connected state, the now suction of the first compressor 1
Gas port is connected with the above-mentioned other end of the second compressor 2；When the second compressor 2 runs, stop valve 6 is in dissengaged positions, this
When the first compressor 1 air entry and the second compressor 2 the above-mentioned other end be cut off.Specifically, stop valve 6 can be electromagnetism
Valve, is so easy to delicately control its break-make.
Reference picture 1- Fig. 3, refrigerating plant 100 can also include：Switching valve 7, switching valve 7 includes valve port a, valve port b, valve port
C, valve port a are connected with the exhaust outlet of the second compressor 2, and valve port b is connected (direct or indirect) with the air entry of the first compressor 1,
Valve port c can be connected with the other end of First Heat Exchanger 3, and valve port c is connected with the exhaust outlet of the first compressor 1, and valve port a may be selected
Property ground connected with valve port b or valve port c.Switching valve 7 can have two kinds of connection situations：Valve port a- valve port b, valve port a- valve port c, lead to
The annexation crossed between switching valve port, can adjust the connection state of the exhaust outlet of the second compressor 2, and switching valve 7 can be
Triple valve.
In a specific embodiment of the invention, as shown in figure 1, valve port b can be connected and with flash evaporation 5 by dodging
The exhaust port for sending out device 5 is connected with the air entry of the first compressor 1, and there is flash evaporation 5 port d, port d to be immersed in flash evaporation 5
Under interior refrigerant liquid level.So, the exhaust of the second compressor 2, with liquid refrigerants heat exchange, can be changed into saturation in flash evaporation 5
Gas, and it is passed through the air entry of the first compressor 1 together with gas in flash evaporation 5.
In another specific embodiment of the invention, as shown in Fig. 2 valve port b straight with the air entry of the first compressor 1
Lead in succession.Compared with the embodiment shown in Fig. 1, the exhaust of the second compressor 2 does not enter flash evaporation 5 and mixes with liquid refrigerants, and
It is directly to mix with the saturated gas discharged from the exhaust port g of flash evaporation 5, subsequently into the first compressor 1.
In another specific embodiment of the invention, as shown in figure 3, refrigerating plant 100 also includes：Blending tank 10,
Exhaust port, valve port b, the above-mentioned other end of the second heat exchanger 4 of flash evaporation 5 are by the compressor 1 of blending tank 10 and first
Air entry is connected.Specifically, blending tank 10 has 4 ports, and this 4 ports connect the air entry of the first compressor 1, cut respectively
Change valve port b, magnetic valve, the exhaust port g of flash evaporation 5 of valve 7, blending tank 10 can make the exhaust of the second compressor 2 and from sudden strain of a muscle
The saturated gas that hair device 5 is isolated is sufficiently mixed, liquid storage, and plays cushioning effect, reduces pulsation.
Further, according to the actual demand of refrigerating plant 100, refrigerating plant 100 can also include：Control valve 8, for example
Four-way valve, to reach the purpose of cold and hot switching.Specifically, control valve 8 have valve port h, valve port i, valve port j, valve port k, valve port h with
The exhaust outlet of the first compressor 1 is connected, and valve port h is optionally connected with the exhaust outlet of the second compressor 2, such as valve port h and
The valve port c of switching valve 7 is connected, and valve port i is connected with the above-mentioned other end of the first heat exchange unit, valve port j and the second heat exchange unit
The above-mentioned other end is connected, and valve port k is connected with the air entry of the second compressor 2, and valve port k is optional with the air entry of the first compressor 1
Selecting property it is connected, such as valve port k is connected with magnetic valve.
When valve port h is connected with valve port i, and valve port j, when being connected with valve port k, refrigerating plant 100100 is freezed, and first changes
, equivalent to condenser, the second heat exchanger 4 is equivalent to evaporator for hot device 3；When valve port h is connected with valve port j, and valve port i and valve port k connects
When logical, refrigerating plant 100100 is heated.
It is of course also possible to be not provided with controlling valve 8, now refrigerating plant 100 can only have refrigerating function.
When refrigerating plant 100 possesses heat-production functions, as shown in Figure 1-Figure 3, refrigerating plant 100 also includes：First temperature
Sensor 13 and second temperature sensor 14, the first temperature sensor 13 are arranged on First Heat Exchanger 3, second temperature sensor
14 are arranged at the air intake of the second heat exchanger 4, in a heating mode, T2≤t2, and during T1 >=t1, the exhaust of the second compressor 2
Mouth is connected with the air entry of the first compressor 1, wherein, T1 is the detected value of the first temperature sensor 13, and T2 is that second temperature is passed
The detected value of sensor 14, t1 is the first preset temperature value, and t2 is the second preset temperature value, it is preferable that met：T1 >=45 DEG C, t2
≤-5℃。
It is understood that in a heating mode, the first compressor 1 can first be connected in parallel with the second compressor 2, work as temperature
After degree comes up, the first compressor 1 is changed to connect with the second compressor 2, and the valve port a of switching valve 7 is connected with valve port b, refrigerating plant
100 enter two-stage compression pattern, to provide the job stability and efficiency of refrigerating plant 100.
First compressor 1 and the second compressor 2 can have multiple combination form, be described below therein several.
In the first combining form, the first compressor 1 and the second compressor 2 can be constant speed compressor, meet：
0.20≤V1/V2≤0.85, V1 is the delivery space of the first compressor 1, and V2 is the delivery space of the second compressor 2.
In second combining form, the first compressor 1 is constant speed compressor, and the second compressor 2 is frequency-changeable compressor, full
Foot：V1≤V2, V1 are the delivery space of the first compressor 1, and V2 is the delivery space of the second compressor 2.
In the third combining form, the first compressor 1 is constant speed compressor, and the second compressor 2 is constant speed twin-tub transfiguration
Compressor, meets：0.20≤V1/V2≤0.70,0.05≤V1/V3≤0.35, V1 is the delivery space of the first compressor 1, V2
It is the minimum delivery space of the second compressor 2, V3 is the maximum delivery space of the second compressor 2.
In the 4th kind of combining form, the first compressor 1 is constant speed compressor, and the second compressor 2 is constant speed twin-tub transfiguration
Compressor, meets：0.50≤V1/V2≤0.85,0.25≤V1/V3≤0.55, V1 is the delivery space of the first compressor 1, V2
It is the minimum delivery space of the second compressor 2, V3 is the maximum delivery space of the second compressor 2.
In the 5th kind of combining form, the first compressor 1 is constant speed double-cylinder variable-capacity compressor, and the second compressor 2 is frequency conversion
Positive displacement compressor, meets：V1≤V3, V2≤V4, V1 are the minimum delivery space of the first compressor 1, and V2 is the first compressor 1
Maximum delivery space, V3 is the minimum delivery space of the second compressor 2, and V4 is the maximum delivery space of the second compressor 2.
The refrigerating plant 100 of the embodiment of the present invention at least has following mode of operation.
Refrigerating plant 100 has the first mode of operation, and in the first operation mode, the first compressor 1 runs, the second pressure
Contracting machine 2 is closed, and the air entry of the first compressor 1 is connected with the other end of the second heat exchanger 4.
That is, in the first operation mode, the isolated operation of the first compressor 1, under the conditions of refrigeration or heating operation, when
When load is smaller or improves efficiency test, the pattern can be selected, its circulation is：First compressor 1- controls valve 8 (h-i)-the
One heat exchange unit-first throttle element 11- flash evaporations 5, two phase refrigerants enter flash evaporation 5, gas-liquid separation, and gas path is sudden strain of a muscle
The air entry of the first compressor of port g- check element 9- 1 of hair device 5；Liquid path is the second restricting elements of port e- of flash evaporation 5
The air entry of the heat exchange units of 12- second-control valve 8 (j-k)-the first compressors of stop valve 6- 1.Now the second compressor 2 is not opened
Move, and the valve port a of switching valve 7 is connected with valve port b.
Refrigerating plant 100 has the second mode of operation, and in the second operation mode, the second compressor 2 runs, the first pressure
Contracting machine 1 is closed, the cut-out of the other end of the air entry of the first compressor 1 and the second heat exchanger 4, the exhaust outlet of the second compressor 2 with
The other end connection of First Heat Exchanger 3.
That is, in the second operation mode, the isolated operation of the second compressor 2, under the conditions of refrigeration or heating operation, when
When load is slightly weighed compared with the first mode of operation, the pattern is selected, its circulation is：Second compressor 2- switching valves 7 (a-c)-control valve 8
(h-i) the-the first heat exchange unit-the second heat exchange units of the-the second restricting element 12- of first throttle element 11- flash evaporations 5 (f-e)-control
The compressor 2 of valve processed 8 (j-k)-the second.Now the first compressor 1 does not start, and stop valve 6 is closed, at check element 9
In reverse check working condition.
Refrigerating plant 100 has the 3rd mode of operation, and in the third mode of operation, the first compressor 1 and second compresses
Machine 2 runs, the cut-out of the other end of the air entry of the first compressor 1 and the second heat exchanger 4, the exhaust outlet of the second compressor 2 with
The air entry connection of the first compressor 1.
That is, in the third mode of operation, refrigerating plant 100 realizes two-stage compression, specifically, it is more than in pressure ratio
When more than 6.5, two stages of compression pattern is selected, its circulation is：The suction of second the-the first compressor 1 of compressor 2- switching valves 7 (a-b)
Gas port, wherein, in the embodiment shown in fig. 1, switching valve 7 (a-b)-flash evaporation 5 port d is cold with liquid in flash evaporation 5
Matchmaker exchanges heat, and is changed into saturated gas, with gas in flash evaporation 5 together from the first compressor of port g- check element 9- 1 of flash evaporation 5
Air entry, in the embodiment shown in Figure 2, air entry and the circuit flash evaporation 5 of the compressor 1 of circuit switching valve 7 (a-b)-the first
The air entry of the first compressor of port d- check element 9- 1 mixes at the air entry of the first compressor 1, in the reality shown in Fig. 3
Apply in example, the air entry of switching valve 7 (a-b)-the first compressors of blending tank 10- 1, the port g- check elements 9- of flash evaporation 5 mixes
The air entry of the first compressors of tank 10- 1, the path that refrigerant enters after the first compressor 1 is that the first compressor 1- controls the (h- of valve 8
I) the-the first heat exchange unit-port f of first throttle element 11- flash evaporations 5, in flash evaporation 5, gas-liquid separation, gas is from flash evaporation
5 upper port g are discharged, and liquid coolant is from the second heat exchange units of the second restricting elements of port e- 12- of flash evaporation 5-(j- of control valve 8
K) the-the second compressor 2.Now stop valve 6 is in and closes cut-off state.
Other of refrigerating plant 100 according to embodiments of the present invention are constituted and operated for those of ordinary skill in the art
For be all known, be not detailed herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example are described
Structure, material or feature are contained at least one embodiment of the invention or example.In this manual, to above-mentioned term
Schematic representation is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or spy
Point can in an appropriate manner be combined in one or more any embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
Can these embodiments be carried out with various changes, modification, replacement and modification in the case of departing from principle of the invention and objective, this
The scope of invention is limited by claim and its equivalent.
Claims (21)
1. a kind of refrigerating plant, it is characterised in that including：First compressor, the second compressor, First Heat Exchanger, the second heat exchange
Device and flash evaporation；
The flash evaporation is connected between one end of one end of the First Heat Exchanger and second heat exchanger, and the shwoot
The exhaust port of device is connected with the air entry of first compressor；
The other end of the First Heat Exchanger be connected with the exhaust outlet of first compressor and with the row of second compressor
Gas port is optionally connected；
The other end of second heat exchanger be connected with the air entry of second compressor and with the suction of first compressor
Gas port is optionally connected；
The exhaust outlet of second compressor is optionally connected with the other end of the First Heat Exchanger.
2. refrigerating plant according to claim 1, it is characterised in that also include：Stop valve, the stop valve is connected to institute
State between the air entry of the first compressor and the other end of second heat exchanger, and positioned at the suction of first compressor
Between the air entry of gas port and second compressor, wherein when second compressor is closed, the stop valve is in and connects
Logical state, in second compressor operating, the stop valve is in dissengaged positions.
3. refrigerating plant according to claim 2, it is characterised in that the stop valve is magnetic valve.
4. refrigerating plant according to claim 1, it is characterised in that also include：Switching valve, the switching valve includes valve port
A, valve port b, valve port c, the valve port a are connected with the exhaust outlet of second compressor, the valve port b and first compressor
Air entry be connected, the valve port c is connected with the other end of the First Heat Exchanger, the valve port a optionally with
The valve port b or described valve ports c connections.
5. refrigerating plant according to claim 4, it is characterised in that the valve port b is connected and passes through with the flash evaporation
The exhaust port of the flash evaporation is connected with the air entry of first compressor.
6. refrigerating plant according to claim 5, it is characterised in that the flash evaporation has port d, the port d leachings
Under refrigerant liquid level not in the flash evaporation.
7. refrigerating plant according to claim 4, it is characterised in that the air-breathing of the valve port b and first compressor
Mouth is directly connected.
8. refrigerating plant according to claim 4, it is characterised in that also include：Blending tank, the row of the flash evaporation
Gas port, the valve port b, the other end of second heat exchanger pass through the blending tank and first compressor
Air entry is connected.
9. refrigerating plant according to claim 1, it is characterised in that the flash evaporation has port e and port f, described
Port e and the port f are submerged under the refrigerant liquid level in the flash evaporation, and the port e and second heat exchanger
Described one end be connected, the port f is connected with described one end of the First Heat Exchanger.
10. refrigerating plant according to claim 1, it is characterised in that the exhaust port of the flash evaporation with it is described
The check element from the flash evaporation to the first compressor one-way conduction is provided between the air entry of the first compressor.
11. refrigerating plants according to claim 1, it is characterised in that also include：Control valve, the control valve has valve
Mouthful h, valve port i, valve port j, valve port k, the valve port h be connected with the exhaust outlet of first compressor and with second compressor
Exhaust outlet be optionally connected, the valve port i is connected with the other end of first heat exchange unit, the valve port j
The other end with second heat exchange unit is connected, the valve port k be connected with the air entry of second compressor and with
The air entry of first compressor is optionally connected.
12. refrigerating plants according to claim 1, it is characterised in that also include：It is arranged on the First Heat Exchanger
First temperature sensor and the second temperature sensor being arranged at the air intake of second heat exchanger, in a heating mode, T2
≤ t2, and during T1 >=t1, the exhaust outlet of second compressor is connected with the air entry of first compressor, wherein, T1 is
The detected value of first temperature sensor, T2 is the detected value of the second temperature sensor, and t1 is the first preset temperature value,
T2 is the second preset temperature value.
13. refrigerating plants according to claim 12, it is characterised in that meet：T1 >=45 DEG C, t2≤- 5 DEG C.
14. refrigerating plant according to any one of claim 1-13, it is characterised in that first compressor and described
Second compressor is constant speed compressor, meets：0.20≤V1/V2≤0.85, V1 is the delivery space of first compressor,
V2 is the delivery space of second compressor.
15. refrigerating plant according to any one of claim 1-13, it is characterised in that first compressor is constant speed
Compressor, second compressor is frequency-changeable compressor, is met：V1≤V25, V1 are the delivery space of first compressor,
V2 is the delivery space of second compressor.
16. refrigerating plant according to any one of claim 1-13, it is characterised in that first compressor is constant speed
Compressor, second compressor is constant speed double-cylinder variable-capacity compressor, is met：0.20≤V1/V2≤0.70,0.05≤V1/V3
≤ 0.35, V1 are the delivery space of first compressor, and V2 is the minimum delivery space of second compressor, and V3 is described
The maximum delivery space of the second compressor.
17. refrigerating plant according to any one of claim 1-13, it is characterised in that first compressor is constant speed
Compressor, second compressor is constant speed double-cylinder variable-capacity compressor, is met：0.50≤V1/V2≤0.85,0.25≤V1/V3
≤ 0.55, V1 are the delivery space of first compressor, and V2 is the minimum delivery space of second compressor, and V3 is described
The maximum delivery space of the second compressor.
18. refrigerating plant according to any one of claim 1-13, it is characterised in that first compressor is constant speed
Double-cylinder variable-capacity compressor, second compressor is frequency conversion positive displacement compressor, is met：V1≤V3, V2≤V4, V1 are described first
The minimum delivery space of compressor, V2 is the maximum delivery space of first compressor, V3 be second compressor most
Small delivery space, V4 is the maximum delivery space of second compressor.
19. refrigerating plant according to any one of claim 1-13, it is characterised in that the refrigerating plant has first
Mode of operation, and in this first operative mode, first compressor operating, second compressor is closed, and described the
The air entry of one compressor is connected with the other end of second heat exchanger.
20. refrigerating plant according to any one of claim 1-13, it is characterised in that the refrigerating plant has second
Mode of operation, and under second mode of operation, second compressor operating, first compressor is closed, and described the
The other end of the air entry of one compressor and second heat exchanger cuts off, the exhaust outlet of second compressor with it is described
The other end connection of First Heat Exchanger.
21. refrigerating plant according to any one of claim 1-13, it is characterised in that the refrigerating plant has the 3rd
Mode of operation, and under the 3rd mode of operation, first compressor and second compressor run, described first
The other end of the air entry of compressor and second heat exchanger cuts off, the exhaust outlet of second compressor and described the
The air entry connection of one compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184719.9A CN106885389A (en) | 2017-03-24 | 2017-03-24 | Refrigerating plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184719.9A CN106885389A (en) | 2017-03-24 | 2017-03-24 | Refrigerating plant |
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| CN106885389A true CN106885389A (en) | 2017-06-23 |
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| CN201710184719.9A Pending CN106885389A (en) | 2017-03-24 | 2017-03-24 | Refrigerating plant |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107202005A (en) * | 2017-07-31 | 2017-09-26 | 广东美芝制冷设备有限公司 | Compressor assembly and the refrigeration system with it |
| CN110986409A (en) * | 2019-10-31 | 2020-04-10 | 珠海格力节能环保制冷技术研究中心有限公司 | Heat exchange system, control method of heat exchange system and air conditioner |
| WO2020098354A1 (en) * | 2018-11-14 | 2020-05-22 | 珠海格力电器股份有限公司 | Cascade air conditioner system |
| CN111288678A (en) * | 2020-03-09 | 2020-06-16 | 中国轻工业武汉设计工程有限责任公司 | Single-stage and double-stage switching evaporation supercooling refrigeration heat pump circulation system |
| CN113251683A (en) * | 2021-06-17 | 2021-08-13 | 广州能茵热泵科技有限公司 | Cascade type air source heat pump system capable of automatically switching high-low evaporation and operation method |
| CN115615048A (en) * | 2022-12-20 | 2023-01-17 | 山东赛斯特冷冻系统有限公司 | Heat pump set heat recovery heating system |
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