CN103574953A - Multiple-temperature heat exchange system under single-compressor refrigerant control - Google Patents
Multiple-temperature heat exchange system under single-compressor refrigerant control Download PDFInfo
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- CN103574953A CN103574953A CN201310559482.XA CN201310559482A CN103574953A CN 103574953 A CN103574953 A CN 103574953A CN 201310559482 A CN201310559482 A CN 201310559482A CN 103574953 A CN103574953 A CN 103574953A
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Abstract
The invention discloses a multiple-temperature heat exchange system under single-compressor refrigerant control. A single refrigerating unit is used for achieving the requirement for controlling multiple isolated temperatures, thus, the temperature of a controlled object is controlled, overall energy consumption is reduced and production cost is saved.
Description
[technical field]
The present invention relates to heat exchange field, relate in particular to many temperature heat-exchange system that a kind of single compressed machine refrigerant is controlled.
[background technology]
How can accurately control the flow (the expansion flow of compressed refrigerant) of refrigerator refrigerant, carry out heat exchange with liquid or gas, thereby to control be refrigerator refrigerant to the precision temperature that reaches liquid or gas--water or air heat exchange frozen water machine in industry for the important topic of the temperature constant of equipment or object.For there being a plurality of independent temperature to control, particularly the constant temperature system of precision temperature demand for control, typically uses a plurality of independently compressors and freezes or heat.Use media or the object of a plurality of pinpoint target temperature of single refrigeration unit controls, particularly precision temperature is controlled, need to solve the difference due to the operating mode of variant temperature channel, as: move or stop, temperature is high or low, and affects the problem of the compression/expansion of precision that other channel temperatures control and refrigeration system refrigerant.
[summary of the invention]
The technical problem to be solved in the present invention is to provide many temperature heat-exchange system that a kind of single compressed machine refrigerant is controlled, and uses single refrigeration unit to complete a plurality of independent temperature demands for control, to reach temperature control, energy-conservation object.
For solving the problems of the technologies described above, the invention provides many temperature heat-exchange system that a kind of single compressed machine refrigerant is controlled, comprise the first circulation of fluid path, the second circulation of fluid path, cooling fluid circuit and factory's business fluid passage,
Described the first circulation of fluid path comprises First Heat Exchanger, the first circulation of fluid entrance and the outlet of the first circulation of fluid, the first circulation of fluid and cooling fluid carry out heat exchange at described First Heat Exchanger place, described First Heat Exchanger comprises first input end mouth, the first output port being communicated with first input end mouth, the second input port and the second output port being communicated with the second input port
Described the second circulation of fluid path comprises the second heat exchanger, the second circulation of fluid entrance and the outlet of the second circulation of fluid, the second circulation of fluid and cooling fluid carry out heat exchange at described the second heat exchanger place, described the second heat exchanger comprises the 3rd input port, the 3rd output port, the four-input terminal mouth that are communicated with the 3rd input port and the 4th output port being communicated with four-input terminal mouth
Described cooling fluid circuit comprises compressor, the 3rd heat exchanger, the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve, cooling fluid and factory's business fluid carry out heat exchange at described the 3rd heat exchanger place, described the 3rd heat exchanger comprises the 5th input port, the 5th output port being communicated with the 5th input port, the 6th input port and the 6th output port being communicated with the 6th input port, the output port of described the first electric expansion valve is connected with the second input port of described First Heat Exchanger, the input port of described the first electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, the output port of described the second electric expansion valve is connected with the four-input terminal mouth of described the second heat exchanger, the input port of described the second electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, described the 3rd output port of electric expansion valve and the input port of described compressor are connected, the input port of described the 3rd electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, the output port of described compressor is connected with the 6th input port of described the 3rd heat exchanger, the input port of described compressor is connected with the second output port of described First Heat Exchanger, or be connected with the 4th output port of described the second heat exchanger, or be connected with the output port of the 3rd electric expansion valve,
Described factory business fluid flows into from the 5th input port of described the 3rd heat exchanger, from the 5th output port of described the 3rd heat exchanger, flows out.
Further, described the first circulation of fluid path also comprises the first temperature sensor for detection of described the first circulation of fluid temperature, described the second circulation of fluid path also comprises the second temperature sensor for detection of described the second circulation of fluid temperature, and the circulation of fluid temperature detecting based on described the first temperature sensor and the second temperature sensor is controlled the switch ratio of the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve.
Further, the switch ratio of described the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve is controlled.
Further, described cooling fluid circuit has three loops, and article one loop is: the loop that described compressor, described the 3rd heat exchanger, described the first electric expansion valve and described First Heat Exchanger form,
Second loop is: the loop that described compressor, described the 3rd heat exchanger, described the 3rd electric expansion valve form,
Article three, loop is: the loop that described compressor, described the 3rd heat exchanger, described the second electric expansion valve and described the second heat exchanger form.
Further, described the first circulation of fluid path also comprises the first circulating pump for increasing described the first circulation of fluid circulation power, the input port of described the first circulating pump is communicated with the first output port of described First Heat Exchanger, and the output port of described the first circulating pump is communicated with described the first circulation of fluid outlet.
Further, described the first circulating pump is provided with primary heater, to improve the temperature of the first circulation of fluid.
Further, described the second circulation of fluid path also comprises the second circulating pump for increasing described the second circulation of fluid circulation power, the input port of described the second circulating pump is communicated with the 3rd output port of described the second heat exchanger, and the output port of described the second circulating pump is communicated with described the second circulation of fluid outlet.
Further, described the second circulating pump is provided with secondary heater, to improve the temperature of the second circulation of fluid.
Further, described circulation of fluid is liquid or gas, and described cooling fluid is freon refrigerant, and described factory business fluid is cooling water.
Compared with prior art, the present invention uses single refrigeration unit to complete a plurality of independent temperature demands for control, makes it both to have controlled controlled object temperature, has reduced again overall energy consumption, has saved production cost.
[accompanying drawing explanation]
Fig. 1 is many temperature heat-exchange system of controlling of single compressed machine refrigerant in the present invention structural representation in one embodiment.
Wherein: 100 is many temperature heat-exchange system that single compressed machine refrigerant is controlled, 110 is the first circulation of fluid path, 111 is the first circulation of fluid entrance, 112 is the first circulation of fluid outlet, 113 is First Heat Exchanger, 114 is the first temperature sensor, 115 is primary heater, 116 is the first circulating pump, 120 is the second circulation of fluid path, 121 is the second circulation of fluid entrance, 122 is the second circulation of fluid outlet, 123 is the second heat exchanger, 124 is the second temperature sensor, 125 is secondary heater, 126 is the second circulating pump, 130Wei factory business fluid passage, 131Wei factory business fluid intake, 132Wei factory business fluid issuing, 133 is the 3rd heat exchanger, 140 is cooling fluid circuit, 141 is the first electric expansion valve, 142 is the second electric expansion valve, 143 is the 3rd electric expansion valve, 144 is compressor.
[specific embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the specific embodiment, the present invention is further detailed explanation.
Alleged " embodiment " or " embodiment " refer to that special characteristic, structure or the characteristic relevant to described embodiment at least can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur also nonessentially all refer to same embodiment, must not be yet with other embodiment mutually exclusive separately or select embodiment.In addition, represent sequence of modules in method, flow chart or the functional block diagram of one or more embodiment and revocablely refer to any particular order, not also being construed as limiting the invention.
Fig. 1 is many temperature heat-exchange system of controlling of single compressed machine refrigerant in the present invention structural representation in one embodiment.As shown in Figure 1, many temperature heat-exchange system 100 that described single compressed machine refrigerant is controlled comprises the first circulation of fluid path 110, the second circulation of fluid path 120, cooling fluid circuit 140He factory business fluid passage 130.
Described the first circulation of fluid path 110 comprises First Heat Exchanger 113, the first circulation of fluid entrance 111 and the first circulation of fluid outlet 112.The first circulation of fluid and cooling fluid carry out heat exchange at described First Heat Exchanger 113 places.
Described First Heat Exchanger 113 comprises first input end mouth, the first output port being communicated with first input end mouth, the second input port and the second output port being communicated with the second input port.
Described the first circulation of fluid is the first input end mouth inflow First Heat Exchanger 113 by described First Heat Exchanger 113 through the first circulation of fluid entrance 111, fluid flows out from the first output port of First Heat Exchanger 113, and flows out by described the second circulation of fluid outlet 112.
Described the second circulation of fluid path 120 comprises that the second heat exchanger 123, the second circulation of fluid entrance 121 and the second circulation of fluid outlet 122, the second circulation of fluids and cooling fluid carry out heat exchange at described the second heat exchanger 123 places.
Described the second heat exchanger 123 comprises the 3rd input port, the 3rd output port, the four-input terminal mouth that are communicated with the 3rd input port and the 4th output port being communicated with four-input terminal mouth.
Described the second circulation of fluid flows into the second heat exchanger 123 through the second circulation of fluid entrance 121 by the 3rd input port of described the second heat exchanger 123, fluid flows out from the 3rd output port of the second heat exchanger 123, and flows out by described the second circulation of fluid outlet 122.
Described factory business fluid intake 131 is connected with the 5th input port of described the 3rd heat exchanger 133, and described factory business fluid issuing 132 is connected with the 5th output port of described the 3rd heat exchanger 133.
Described cooling fluid circuit 140 comprises compressor 144, the 3rd heat exchanger 133, the first electric expansion valve 141, the second electric expansion valve 142 and the 3rd electric expansion valve 143.Cooling fluid and factory's business fluid carry out heat exchange at described the 3rd heat exchanger 133 places.
Described the 3rd heat exchanger 133 comprises the 5th input port, the 5th output port being communicated with the 5th input port, the 6th input port and the 6th output port being communicated with the 6th input port, the output port of described the first electric expansion valve 141 is connected with the second input port of described First Heat Exchanger 113, the input port of described the first electric expansion valve 141 is connected with the 6th output port of described the 3rd heat exchanger 133, the output port of described the second electric expansion valve 142 is connected with the four-input terminal mouth of described the second heat exchanger 123, the input port of described the second electric expansion valve 142 is connected with the 6th output port of described the 3rd heat exchanger 133, the output port of described the 3rd electric expansion valve 143 is connected with the input port of described compressor 144, the input port of described the 3rd electric expansion valve 143 is connected with the 6th output port of described the 3rd heat exchanger 133, the output port of described compressor 144 is connected with the 6th input port of described the 3rd heat exchanger 133, the input port of described compressor 144 is connected with the second output port of described First Heat Exchanger 113, or be connected with the 4th output port of described the second heat exchanger 123, or be connected with the output port of the 3rd electric expansion valve 143.
Described cooling fluid flows out the 6th input port through the 3rd heat exchanger 133 via the output of compressor 144, a part flows into First Heat Exchanger 113 through the first electric expansion valve 141, cooling fluid flows out from the second delivery outlet end of First Heat Exchanger 113, by the input of compressor 144, is got back in compressor 144; Another part, through the 3rd electric expansion valve 143, is got back in compressor 144 by the input of compressor 144; Some flows into the second heat exchanger 123 through the second electric expansion valve 142, and cooling fluid flows out from the 4th delivery outlet end of the second heat exchanger 123, by the input of compressor 144, is got back in compressor 144.
Wherein the switch ratio of the first electric expansion valve 141, the second electric expansion valve 142 and the 3rd electric expansion valve 143 is adjustable, be opened into 0% unlatching such as 100%, adjust grade, so have 0% for every 5% 1,5%, 10% ...---95%, 100% much more so switch ratio grades, like this with respect to overall system control flow bore, can point-device adjustment flow, thus the power of heat exchange can be controlled accurately, and then the temperature of accurate controlled circulation fluid.Each electric expansion valve, with stepper motor or the direct current generator of gauge tap ratio, is controlled the switch ratio of described electric expansion valve by controlling described stepper motor or direct current generator.During high temperature, as 80 degrees Celsius of circulation of fluids, need be down to 20 degrees Celsius, allowing the first electric expansion valve 141 open tunes up, the second electric expansion valve 142 is opened and is tuned up, the 3rd electric expansion valve 143 is opened and is turned down or close, and increases the heat exchange amount of cooling fluid and circulation of fluid, reduces the object of circulation of fluid temperature to reach high-amplitude; During low temperature, as 25 degrees Celsius of circulation of fluids, need be down to 20 degrees Celsius, allowing the first electric expansion valve 141 open turns down, the second electric expansion valve 142 is opened and is turned down, the 3rd electric expansion valve 143 is opened and is tuned up, and reduces the heat exchange amount of cooling fluid and circulation of fluid, reduces the object of circulation of fluid temperature to reach low amplitude.
Can find out, described cooling fluid circuit 140 has three paths, article one, path is: the loop that described compressor 144, described the 3rd heat exchanger 133, described the first electric expansion valve 141 and described First Heat Exchanger 113 form, concrete, described cooling fluid flows out from described compressor 144, flow through described the 3rd heat exchanger 133, the first electric expansion valve 141 and described First Heat Exchanger 113, at described the 3rd heat exchanger 133 and First Heat Exchanger 113 places, carry out heat exchange, get back to subsequently described compressor 144.
Second loop is: the loop that described compressor 144, described the 3rd heat exchanger 133, described the 3rd electric expansion valve 143 form, concrete, described cooling fluid flows out from described compressor 144, flow through described the 3rd heat exchanger 133 and the 3rd electric expansion valve 143, at described the 3rd heat exchanger 133 places, carry out heat exchange, get back to subsequently described compressor 144.
Article three, loop is: the loop that described compressor 144, described the 3rd heat exchanger 133, described the second electric expansion valve 142 and described the second heat exchanger 123 form, concrete, described cooling fluid flows out from described compressor 144, flow through described the 3rd heat exchanger 133, the second electric expansion valve 142 and described the second heat exchanger 123, at described the 3rd heat exchanger 133 and the second heat exchanger 123 places, carry out heat exchange, get back to subsequently described compressor 144.
In the present embodiment, described the first circulation of fluid path 110 also comprises the first circulating pump 116 for increasing described the first circulation of fluid circulation power, the input port of described the first circulating pump 116 is communicated with the first output port of described First Heat Exchanger 113, and the output port of described the first circulating pump 116 is communicated with described circulation of fluid outlet 112.In order to improve the temperature of the first circulation of fluid, described the first circulating pump 116 is provided with primary heater 115.Described the second circulation of fluid path 120 also comprises the second circulating pump 126 for increasing described the second circulation of fluid circulation power, the input port of described the second circulating pump 126 is communicated with the 3rd output port of described the second heat exchanger 123, and the output port of described the second circulating pump 126 is communicated with described the second circulation of fluid outlet 122.In order to improve the temperature of the second circulation of fluid, described the second circulating pump 126 is provided with secondary heater 125.
On described the first circulation of fluid path 110, also comprise the first temperature sensor 114, it is for detection of the temperature of described the first circulation of fluid.The input port of described the first temperature sensor 114 is communicated with the output port of described the first circulating pump 116, and the output port of described the first temperature sensor 114 is connected with described the first circulation of fluid outlet 112.Described the first circulation of fluid flows out from the first output port of described First Heat Exchanger 113, through the first circulating pump 116 and the first temperature sensor 114, arrives the first circulation of fluid outlet 112.Described the second circulation of fluid path 120 also comprises the second temperature sensor 124, and it is for detection of the temperature of described the second circulation of fluid.The input port of described the second temperature sensor 124 is communicated with the output port of described the second circulating pump 126, and the output port of described the second temperature sensor 124 is connected with described the second circulation of fluid outlet 122.Described the second circulation of fluid flows out from the 3rd output port of described the second heat exchanger 123, through the second circulating pump 126 and the second temperature sensor 124, arrives the second circulation of fluid outlet 122.
The second circulation of fluid temperature that the first circulation of fluid temperature detecting based on described the first temperature sensor 114 and the second temperature sensor 124 detect is controlled the switch ratio of the first electric expansion valve 141, the second electric expansion valve 142 and the 3rd electric expansion valve 143, thereby realize the control to cooling fluid in many temperature heat-exchange system 100 that single compressed machine refrigerant is controlled, and then realize the accurate temperature control of controlled device.
In the present embodiment, described circulation of fluid is liquid or gas, and described cooling fluid is freon refrigerant, and described factory business fluid is cooling water.
In sum, many temperature heat-exchange system 100 that single compressed machine refrigerant of the present invention is controlled arranges the first electric expansion valve 141 between the 6th output port of described the 3rd heat exchanger 133 and the second input port of described First Heat Exchanger 113; Between the 6th output port of described the 3rd heat exchanger 133 and the four-input terminal mouth of described the second heat exchanger 123, the second electric expansion valve 142 is set.Many temperature heat-exchange system 100 that described single compressed machine refrigerant is controlled also comprises and is arranged at the first temperature sensor 114 for detection of described the first circulation of fluid temperature on described the first circulation of fluid path 110 and is arranged at the second temperature sensor 124 for detection of described the second circulation of fluid temperature on described the second circulation of fluid path 120, the second circulation of fluid temperature that the first circulation of fluid temperature detecting based on described the first temperature sensor 114 and described the second temperature sensor 124 detect is controlled the switch ratio of each electric expansion valve, regulate a part of cooling fluid and first, the heat exchange amount of the second circulation of fluid.Utilize more than 1 or 2 electric expansion valve ratios adjusting to reach wide temperature field control object, thereby effectively accomplish that circulating fluid is at the accurate temperature controlling of a wider temperature range.
Its specific works principle is: described cooling fluid flows out from compressor 144, through the 3rd heat exchanger 133, described cooling fluid carries out after heat exchange at the 3rd heat exchanger 133Chu Yu factory business fluid, a part is through the first electric expansion valve 141 and First Heat Exchanger 113, and described cooling fluid is got back to compressor 144 after First Heat Exchanger 113 places and the first circulation of fluid are carried out heat exchange; A part is through the second electric expansion valve 142 and the second heat exchanger 123, and described cooling fluid is got back to compressor 144 at the second heat exchanger 123 places and after carrying out heat exchange with the second circulation of fluid; Another part is got back to compressor 144 after the 3rd electric expansion valve 143.
It should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. many temperature heat-exchange system that single compressed machine refrigerant is controlled, is characterized in that, comprises the first circulation of fluid path, the second circulation of fluid path, cooling fluid circuit and factory's business fluid passage,
Described the first circulation of fluid path comprises First Heat Exchanger, the first circulation of fluid entrance and the outlet of the first circulation of fluid, the first circulation of fluid and cooling fluid carry out heat exchange at described First Heat Exchanger place, described First Heat Exchanger comprises first input end mouth, the first output port being communicated with first input end mouth, the second input port and the second output port being communicated with the second input port
Described the second circulation of fluid path comprises the second heat exchanger, the second circulation of fluid entrance and the outlet of the second circulation of fluid, the second circulation of fluid and cooling fluid carry out heat exchange at described the second heat exchanger place, described the second heat exchanger comprises the 3rd input port, the 3rd output port, the four-input terminal mouth that are communicated with the 3rd input port and the 4th output port being communicated with four-input terminal mouth
Described cooling fluid circuit comprises compressor, the 3rd heat exchanger, the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve, cooling fluid and factory's business fluid carry out heat exchange at described the 3rd heat exchanger place, described the 3rd heat exchanger comprises the 5th input port, the 5th output port being communicated with the 5th input port, the 6th input port and the 6th output port being communicated with the 6th input port, the output port of described the first electric expansion valve is connected with the second input port of described First Heat Exchanger, the input port of described the first electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, the output port of described the second electric expansion valve is connected with the four-input terminal mouth of described the second heat exchanger, the input port of described the second electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, described the 3rd output port of electric expansion valve and the input port of described compressor are connected, the input port of described the 3rd electric expansion valve is connected with the 6th output port of described the 3rd heat exchanger, the output port of described compressor is connected with the 6th input port of described the 3rd heat exchanger, the input port of described compressor is connected with the second output port of described First Heat Exchanger, or be connected with the 4th output port of described the second heat exchanger, or be connected with the output port of the 3rd electric expansion valve,
Described factory business fluid flows into from the 5th input port of described the 3rd heat exchanger, from the 5th output port of described the 3rd heat exchanger, flows out.
2. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 1 is controlled, it is characterized in that: described the first circulation of fluid path also comprises the first temperature sensor for detection of described the first circulation of fluid temperature, described the second circulation of fluid path also comprises the second temperature sensor for detection of described the second circulation of fluid temperature, and the circulation of fluid temperature detecting based on described the first temperature sensor and the second temperature sensor is controlled the switch ratio of the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve.
3. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 2 is controlled, is characterized in that: the switch ratio of described the first electric expansion valve, the second electric expansion valve and the 3rd electric expansion valve is controlled.
4. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 1 is controlled, it is characterized in that: described cooling fluid circuit has three loops, article one, loop is: the loop that described compressor, described the 3rd heat exchanger, described the first electric expansion valve and described First Heat Exchanger form
Second loop is: the loop that described compressor, described the 3rd heat exchanger, described the 3rd electric expansion valve form,
Article three, loop is: the loop that described compressor, described the 3rd heat exchanger, described the second electric expansion valve and described the second heat exchanger form.
5. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 1 is controlled, it is characterized in that: described the first circulation of fluid path also comprises the first circulating pump for increasing described the first circulation of fluid circulation power, the input port of described the first circulating pump is communicated with the first output port of described First Heat Exchanger, and the output port of described the first circulating pump is communicated with described the first circulation of fluid outlet.
6. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 5 is controlled, is characterized in that: described the first circulating pump is provided with primary heater, to improve the temperature of the first circulation of fluid.
7. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 1 is controlled, it is characterized in that: described the second circulation of fluid path also comprises the second circulating pump for increasing described the second circulation of fluid circulation power, the input port of described the second circulating pump is communicated with the 3rd output port of described the second heat exchanger, and the output port of described the second circulating pump is communicated with described the second circulation of fluid outlet.
8. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 7 is controlled, is characterized in that: described the second circulating pump is provided with secondary heater, to improve the temperature of the second circulation of fluid.
9. many temperature heat-exchange system that single compressed machine refrigerant as claimed in claim 1 is controlled, is characterized in that: described circulation of fluid is liquid or gas, described cooling fluid is freon refrigerant, and described factory business fluid is cooling water.
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| CN201310559482.XA CN103574953B (en) | 2013-11-12 | 2013-11-12 | Many temperature heat-exchange system that a kind of single compressed machine refrigerant controls |
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| CN201310559482.XA CN103574953B (en) | 2013-11-12 | 2013-11-12 | Many temperature heat-exchange system that a kind of single compressed machine refrigerant controls |
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| CN106152583A (en) * | 2016-08-23 | 2016-11-23 | 无锡溥汇机械科技有限公司 | A kind of High-precision temperature control type heat exchange system |
| CN106440595A (en) * | 2016-12-03 | 2017-02-22 | 无锡溥汇机械科技有限公司 | Fluid pressure control system of two-temperature integral water chiller |
| CN106482392A (en) * | 2016-12-01 | 2017-03-08 | 无锡溥汇机械科技有限公司 | A kind of two temperature one frozen water machine precision heat-exchange system |
| CN111023606A (en) * | 2019-12-27 | 2020-04-17 | 无锡溥汇机械科技有限公司 | Large-flow small-temperature-difference precise temperature control heat exchange system |
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| CN111023606A (en) * | 2019-12-27 | 2020-04-17 | 无锡溥汇机械科技有限公司 | Large-flow small-temperature-difference precise temperature control heat exchange system |
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| Publication number | Publication date |
|---|---|
| CN103574953B (en) | 2016-01-13 |
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