CN211601217U - Two-stage collocation refrigerating system for ultralow temperature environment room - Google Patents
Two-stage collocation refrigerating system for ultralow temperature environment room Download PDFInfo
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- CN211601217U CN211601217U CN201921584498.5U CN201921584498U CN211601217U CN 211601217 U CN211601217 U CN 211601217U CN 201921584498 U CN201921584498 U CN 201921584498U CN 211601217 U CN211601217 U CN 211601217U
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Abstract
The utility model provides a two-stage collocation refrigeration system for an ultra-low temperature environment chamber, which comprises a high-pressure stage compressor, a condenser, an intermediate pressure expansion valve, an intercooler, a gas-liquid separator, a hot gas-liquid separator with a return, an evaporation module and a low-pressure stage compressor; the condenser and the gas-liquid separator are connected with the high-pressure stage compressor, the output port of the condenser is connected with a first branch and a second branch, and the input end of the first branch is sequentially provided with a first electromagnetic valve and an intermediate pressure expansion valve; the output ends of the first branch and the second branch are connected with an intercooler, and the intercooler is connected with a gas-liquid separator through a third branch; the hot gas liquid separator with the return function is connected with the intercooler, the hot gas liquid separator with the return function is connected with the third branch through the sixth branch, the sixth branch is provided with the low-pressure compressor, the two ends of the evaporation module are connected with the hot gas liquid separator with the return function, the output port of the evaporation module is connected with the third branch through the fifth branch, and the fifth branch is provided with the fourth electromagnetic valve.
Description
Technical Field
The utility model relates to a refrigerating system field especially relates to an ultra-low temperature environment is two-stage collocation refrigerating system for room.
Background
The ultra-low temperature environment chamber is a laboratory capable of simulating a low temperature environment. The ultra-low temperature environment chamber has wide application in the scientific experiment field and the product development service, such as the aspects of energy/nuclear technology, transportation/transportation, machinery, food/medicine, medical treatment/health, electronic information and the like. The refrigerating system is a key component of the ultra-low temperature environment chamber, and the cooling rate and the temperature stability of the ultra-low temperature environment chamber are directly influenced by the performance of the refrigerating system. For a traditional wide-working-condition ultralow-temperature environment laboratory refrigeration system, two independent refrigeration systems are adopted, a single-stage compression refrigeration system is adopted under a medium-high-temperature working condition, a two-stage compression refrigeration system or a cascade refrigeration system is adopted under a low-temperature working condition, and the two systems are independently controlled. Two sets of independent refrigerating systems are adopted, so that more refrigerating parts are needed, a larger installation space is occupied, and the initial investment of an ultralow-temperature laboratory is higher. Two independent refrigeration systems need two independent control systems, so that the control systems are complex and difficult to realize. In addition, the ultralow temperature environment chamber is high energy consumption experimental equipment, the refrigerating system is the highest part of the ultralow temperature laboratory, and the energy consumption can be obviously reduced by improving the performance coefficient of the refrigerating system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ultra-low temperature is two-stage collocation refrigerating system for environment room adopts less equipment part to reduce installation space, the switching of reasonable control solenoid to realize single-stage/doublestage compression refrigeration mode, make environment room cooling rate faster, temperature control is more stable.
In order to realize the above-mentioned purpose, the utility model provides an ultra-low temperature environment room is with two-stage collocation refrigerating system, include high-pressure stage compressor, condenser, intermediate pressure expansion valve, intercooler, vapour and liquid separator, take back vapour and liquid separator, evaporation module and low-pressure stage compressor, wherein:
the input port of the condenser is connected with the high-pressure stage compressor, the output port of the condenser is respectively connected with the input ends of a first branch and a second branch, and the first branch is sequentially provided with the first electromagnetic valve and the intermediate pressure expansion valve from the input end;
the intercooler is provided with a first inlet, a first outlet, a second inlet and a second outlet, the output end of the first branch is connected with the first inlet, the output end of the second branch is connected with the second inlet, the first outlet is connected with the input port of the gas-liquid separator through a third branch, and the output port of the gas-liquid separator is connected with the input port of the high-pressure stage compressor;
the hot gas liquid separator with the return function is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, the third inlet is connected with the second outlet, an input port of the evaporation module is connected with the third outlet, an output port of the evaporation module is respectively connected with input ends of a fourth branch and a fifth branch, an output end of the fourth branch is connected with the fourth inlet, an output end of the fifth branch is connected with the third branch, and a fourth electromagnetic valve is arranged on the fifth branch; the fourth outlet is connected with the third branch through a sixth branch, and the sixth branch is provided with the low-pressure stage compressor.
Further, in the two-stage matching refrigeration system for the ultra-low temperature environment chamber, an oil separator is arranged between the output port of the high-pressure stage compressor and the input port of the condenser.
Further, in the two-stage collocation refrigeration system for the ultra-low temperature environment chamber, the intercooler is a plate heat exchanger.
Further, in the two-stage collocation refrigeration system for the ultra-low temperature environment chamber, the evaporation module is of a double-evaporator structure.
Further, in the two-stage collocation refrigeration system for the ultra-low temperature environment chamber, the evaporation module is composed of a medium temperature evaporation route and a low temperature evaporation route which are connected in parallel, the medium temperature evaporation route is sequentially provided with a second electromagnetic valve, a medium temperature expansion valve and a first evaporator from the input end, and the low temperature evaporation route is sequentially provided with a third electromagnetic valve, a low temperature expansion valve and a second evaporator from the input end; and a through one-way valve is arranged between the medium-temperature evaporation route and the low-temperature evaporation route, an input port of the one-way valve is connected with a liquid inlet pipe of the second evaporator, and an output port of the one-way valve is connected with a liquid inlet pipe of the first evaporator.
Further, in the two-stage collocation refrigeration system for the ultra-low temperature environment chamber, the first evaporator and the second evaporator are both fin tube type evaporators.
Further, ultra-low temperature environment room two-stage collocation refrigerating system in, still include control system, control system includes control panel, PLC controller, evaporimeter thermocouple and environment room thermocouple, the control panel with the PLC controller electricity is connected, the PLC controller passes through the evaporimeter thermocouple measures the evaporating temperature of refrigerant, the PLC controller passes through the environment room thermocouple is measured the return air temperature of evaporation module, the PLC controller respectively with high-pressure compressor, first solenoid valve, fourth solenoid valve, evaporation module and low-pressure compressor electricity are connected.
Further, in the two-stage collocation refrigeration system for the ultra-low temperature environment chamber, the high-pressure stage compressor adopts a frequency conversion technology, namely, the PLC controller controls the frequency of the high-pressure stage compressor through a frequency converter.
Further, ultra-low temperature environment room in with two-stage collocation refrigerating system, be equipped with cooling water inlet and cooling water export on the condenser, cooling water inlet department is equipped with the cooling water circulating pump, the PLC controller with the cooling water circulating pump electricity is connected.
Further, ultra-low temperature environment room in with two-stage collocation refrigerating system, be equipped with the evaporimeter fan in the evaporation module, the evaporimeter fan is used for control the evaporation rate of first evaporimeter and second evaporimeter, the evaporimeter fan adopts frequency conversion technique, promptly the PLC controller passes through the frequency converter control the frequency of evaporimeter fan, just the PLC controller respectively with second solenoid valve and third solenoid valve electricity are connected.
Compared with the prior art, the beneficial effects of the utility model are mainly embodied in that: through the opening and closing of the electromagnetic valve, a single-stage compression refrigeration mode, a double-stage compression refrigeration mode and a single-stage and double-stage switching refrigeration mode can be carried out, different refrigeration modes are selected according to different working conditions, the single-stage refrigeration mode is selected during medium-high temperature working conditions, the refrigeration coefficient is obviously improved, the control system is easy to realize, and the operation is simple.
Drawings
FIG. 1 is a schematic diagram of a two-stage collocation refrigeration system for middle and ultra-low temperature environmental chambers of the present invention;
fig. 2 is the schematic diagram of the control system of the two-stage collocation refrigeration system for the middle and ultra-low temperature environment chamber.
Wherein: high-pressure stage compressor 11, oil separator 12, condenser 13, first branch 21, second branch 22, first solenoid valve 23, intermediate pressure expansion valve 24, intercooler 3, first inlet 31, first outlet 32, second inlet 33, second outlet 34, gas-liquid separator 41, third branch 42, hot-gas-liquid separator with return 5, third inlet 51, third outlet 52, fourth inlet 53, fourth outlet 54, second solenoid valve 61, medium temperature expansion valve 62, first evaporator 63, third solenoid valve 64, low temperature expansion valve 65, second evaporator 66, check valve 67, cooling water inlet 71, cooling water outlet 72, cooling water circulation pump 73, fourth branch 81, fifth branch 82, fourth solenoid valve 83, sixth branch 84, low-pressure stage compressor 85, control panel 91, PLC controller 92, evaporator thermocouple 93, environmental chamber thermocouple 94, frequency converter 95, PLC 95, and PLC controller 92, An evaporator fan 96.
Detailed Description
The two-stage collocation refrigeration system for ultra-low temperature environment chambers of the present invention will now be described in greater detail with reference to the schematic drawings, in which preferred embodiments of the present invention are shown, it being understood that those skilled in the art can modify the invention described herein while still achieving the beneficial effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
As shown in fig. 1, the utility model provides a two-stage collocation refrigerating system is used to ultra-low temperature environment room, include high-pressure stage compressor 11, condenser 13, intermediate pressure expansion valve 24, intercooler 3, vapour and liquid separator 41, take back vapour and liquid separator 5, evaporation module, low pressure stage compressor 85 and control system.
Specifically, as shown in fig. 1, an oil separator 12 is disposed between an output port of the high-pressure stage compressor 11 and an input port of the condenser 13, the output port of the condenser 13 is connected to input ports of a first branch 21 and a second branch 22, respectively, and the first branch 21 is provided with a first electromagnetic valve 23 and an intermediate pressure expansion valve 24 in order from the input port. The intercooler 3 is a plate heat exchanger, the first inlet 31, the first outlet 32, the second inlet 33, and the second outlet 34 are provided on the intercooler 3, a first flow passage communicating the first inlet 31 and the first outlet 32 exists in the intercooler 3, a second flow passage communicating the second inlet 33 and the second outlet 34 also exists in the intercooler 3, and the first flow passage and the second flow passage only perform heat transfer. The output end of the first branch 21 is connected with the first inlet 31, the output end of the second branch 22 is connected with the second inlet 33, the first outlet 32 is connected with the input port of the gas-liquid separator 41 through the third branch 42, and the output port of the gas-liquid separator 41 is connected with the input port of the high-pressure stage compressor 11.
Meanwhile, as shown in fig. 1, the hot gas-liquid separator 5 with a return is provided with a third inlet 51, a third outlet 52, a fourth inlet 53 and a fourth outlet 54, the hot gas-liquid separator 5 with a return has a separation chamber for gas-liquid separation, the hot gas-liquid separator 5 with a return also has a third flow channel communicated with the third inlet 51 and the third outlet 52, the third flow channel penetrates through the separation chamber, the fourth inlet 53 is an air inlet of the separation chamber, and the fourth outlet 54 is an air outlet of the separation chamber. A third inlet 51 of the hot gas-liquid separator 5 with the return function is connected with a second outlet 34 of the intercooler 3, an input port of an evaporation module is connected with a third outlet 52 of the hot gas-liquid separator 5 with the return function, an output port of the evaporation module is respectively connected with input ends of a fourth branch 81 and a fifth branch 82, an output end of the fourth branch 81 is connected with a fourth inlet 53, an output end of the fifth branch 82 is connected with a third branch 42, and a fourth electromagnetic valve 83 is arranged on the fifth branch 82; the fourth outlet 54 is connected to the third branch 42 by a sixth branch 84, and a low pressure stage compressor 85 is provided on the sixth branch 84.
Further, as shown in fig. 1, the evaporation module is a dual-evaporator structure, and is composed of a medium-temperature evaporation route and a low-temperature evaporation route which are connected in parallel, the medium-temperature evaporation route is provided with a second solenoid valve 61, a medium-temperature expansion valve 62 and a first evaporator 63 in sequence from the input end, and the low-temperature evaporation route is provided with a third solenoid valve 64, a low-temperature expansion valve 65 and a second evaporator 66 in sequence from the input end; a through one-way valve 67 is arranged between the medium-temperature evaporation route and the low-temperature evaporation route, an input port of the one-way valve 67 is connected with a liquid inlet pipe of the second evaporator 66, and an output port of the one-way valve 67 is connected with a liquid inlet pipe of the first evaporator 63. Meanwhile, an evaporator fan 96 is arranged in the evaporation module, the evaporator fan 96 is used for controlling the evaporation rate of the first evaporator 63 and the second evaporator 66, and the first evaporator 63 and the second evaporator 66 are both fin-tube evaporators.
In addition, as shown in fig. 2, the control system includes a control panel 91, a PLC controller 92, an evaporator thermocouple 93, and an environmental chamber thermocouple 94, the control panel 91 is electrically connected to the PLC controller 92, the PLC controller 92 measures the evaporation temperature of the refrigerant by the evaporator thermocouple 93, and the PLC controller 92 measures the return air temperature of the evaporation module by the environmental chamber thermocouple 94. Meanwhile, the high-pressure stage compressor 11 and the evaporator fan 96 both adopt a frequency conversion technology, and the frequency variation range of the high-pressure stage compressor 11 is 30Hz to 50 Hz. The condenser 3 is provided with a cooling water inlet 71 and a cooling water outlet 72, and a cooling water circulating pump 73 is provided at the cooling water inlet 71. In summary, the PLC controller 92 is electrically connected to the high-pressure stage compressor 11, the cooling water circulation pump 73, the first electromagnetic valve 23, the second electromagnetic valve 61, the second evaporator 66, the fourth electromagnetic valve 83, the evaporator fan 96 and the low-pressure stage compressor 85, and the PLC controller 92 controls the operating frequencies of the high-pressure stage compressor 11 and the evaporator fan 96 through the frequency converter 95.
As shown in fig. 1 to 2, in the single-stage compression refrigeration mode, the PLC controller sequentially controls the cooling water circulation pump 73, the evaporator fan 96, and the high-pressure stage compressor 11 to be started, the coils of the second electromagnetic valve 61 and the fourth electromagnetic valve 83 to be energized, the electromagnetic valves to be opened, the coils of the first electromagnetic valve 23 and the third electromagnetic valve 64 to be de-energized, and the electromagnetic valves to be closed. The signal values measured by the evaporator thermocouple 93 and the environmental chamber thermocouple 94 are subjected to temperature digital/analog conversion and then transmitted to the PLC controller, until the evaporation temperature of the refrigerant is reduced to-25 ℃ or the return air temperature of the evaporator is reduced to-20 ℃, the PLC controller controls the low-pressure stage compressor 85 to be started, the second electromagnetic valve 61 and the fourth electromagnetic valve 83 are powered off and closed, and the first electromagnetic valve 23 and the third electromagnetic valve 64 are powered on and opened, so that the switching of the single/double-stage refrigeration mode is completed.
As shown in fig. 1 to 2, the specific operation is as follows:
under the medium-high temperature working condition, the operation mode of the refrigeration system is a single-stage compression refrigeration mode, the high-pressure stage compressor 11 is started, the second electromagnetic valve 61 and the fourth electromagnetic valve 83 are opened, and the first electromagnetic valve 23 and the third electromagnetic valve 64 are closed. When the high-pressure stage compressor 11 is started, the maximum output frequency of the frequency converter 95 is 50Hz, and the high-pressure stage compressor 11 is operated at full speed, so that the ambient temperature is rapidly reduced to the required temperature, then the frequency of the frequency converter 95 is reduced to an appropriate value, and the high-pressure stage compressor 11 is operated at low speed to maintain the ambient temperature as a set value.
The high-pressure stage compressor 11 compresses the refrigerant to a high-temperature high-pressure state, the refrigerant enters the oil separator 12 through a compressor exhaust pipeline, the oil separator 12 separates a mixture of high-temperature high-pressure refrigerant gas and lubricating oil, the oil returns to the high-pressure stage compressor 11 through an oil return pipe, the high-temperature high-pressure refrigerant gas enters the shell-and-tube condenser 13, and the shell-and-tube condenser 13 condenses the high-temperature high-pressure refrigerant gas into medium-temperature high-pressure refrigerant liquid. Because the first electromagnetic valve 23 is closed, the medium-temperature high-pressure refrigerant liquid enters the second flow channel of the intercooler 3 only through the second branch 22, and enters the evaporation module from the hot gas-liquid separator 5, and enters the medium-temperature expansion valve 62 of the medium-temperature evaporation route at the second electromagnetic valve 61, the medium-temperature expansion valve 62 throttles and reduces the pressure of the medium-temperature high-pressure refrigerant liquid into a low-temperature low-pressure refrigerant gas-liquid mixture, and the refrigerant gas-liquid mixture enters the first evaporator 63 to exchange heat with the environment chamber, so that the environment chamber can be maintained in a low-temperature environment with the lowest temperature of-20 ℃. Since the low-pressure stage compressor 85 is not started, the gas-liquid separator 41 is only connected to the evaporation module, that is, the refrigerant vapor evaporated by the first evaporator 63 flows through the fourth electromagnetic valve 83 from the fifth branch 82 and reaches the gas-liquid separator 41, the refrigerant vapor is subjected to gas-liquid separation by the gas-liquid separator 41 to separate liquid droplets in the low-pressure refrigerant, and since the outlet of the gas-liquid separator 41 is connected to the gas inlet end of the high-pressure stage compressor 11, the refrigerant vapor returns to the high-pressure stage compressor 11 through the compressor suction pipe to perform the next refrigeration cycle.
Under the low-temperature working condition, the operation mode of the refrigeration system is a two-stage compression refrigeration mode, the high-pressure stage compressor 11 and the low-pressure stage compressor 85 are both started, the first electromagnetic valve 23 and the third electromagnetic valve 64 are opened, and the second electromagnetic valve 61 and the fourth electromagnetic valve 83 are closed.
The high-pressure stage compressor 11 compresses the refrigerant to a high-temperature high-pressure state, the refrigerant enters the oil separator 12 through a compressor exhaust pipeline, the oil separator 12 separates a mixture of high-temperature high-pressure refrigerant gas and lubricating oil, the oil returns to the high-pressure stage compressor 11 through an oil return pipe, the high-temperature high-pressure refrigerant gas enters the shell-and-tube condenser 13, and the shell-and-tube condenser 13 condenses the high-temperature high-pressure refrigerant gas into medium-temperature high-pressure refrigerant liquid. Because the first electromagnetic valve 23 is opened, the refrigerant liquid respectively enters the first branch 21 and the second branch 22, the refrigerant liquid on the first branch 21 flows through the first electromagnetic valve 23 and enters the intermediate pressure expansion valve 24, the intermediate pressure expansion valve 24 throttles and cools the refrigerant and then introduces the refrigerant into the first flow passage of the intercooler 3, the second branch 22 directly introduces the refrigerant liquid into the second flow passage of the intercooler 3, and the intercooler 3 performs heat exchange between the refrigerant after being cooled and depressurized in the first flow passage and the refrigerant in the second flow passage, so that the refrigerant in the second flow passage is subcooled.
The supercooled refrigerant liquid in the second flow passage enters a third flow passage with a hot gas-liquid return separator 5, and the hot gas-liquid return separator 5 is connected with two ends of an evaporation module, so that refrigerant vapor discharged by the evaporation module further supercools the refrigerant liquid supercooled by the intercooler 3 in the hot gas-liquid return separator 5.
The input port of the evaporation module receives refrigerant liquid which is further subcooled in a third flow channel of the hot gas-liquid separator 5, the second electromagnetic valve 61 is closed, the third electromagnetic valve 64 is opened, the low-temperature expansion valve 65 on the low-temperature evaporation route throttles, lowers the temperature and the pressure of the subcooled high-pressure refrigerant liquid, the first evaporator 63 and the second evaporator 66 are connected with the low-temperature expansion valve 65 by the one-way valve 67, the refrigerant after being lowered in temperature and pressure flows into the two evaporators, and the heat of the environment chamber is evaporated and absorbed, so that the environment chamber can be maintained in a low-temperature environment with the lowest temperature of-40 ℃. The outlets of the two evaporators in the evaporation module are connected, the evaporated refrigerant vapor is guided into the separation cavity with the hot gas-liquid separator 5 through the fourth branch 81, heat exchange is conveniently carried out between the refrigerant vapor in the separation cavity and the supercooled refrigerant liquid in the third flow channel, the refrigerant in the third flow channel is further supercooled, and the refrigerant vapor in the separation cavity is separated out of liquid drops in the low-pressure refrigerant vapor and is reheated.
The gas inlet end of the low-pressure stage compressor 85 is connected with the fourth outlet 54 with the hot gas-liquid separator 5, the separated refrigerant gas enters the low-pressure stage compressor 85 through the sixth branch 84, the low-pressure stage compressor 85 compresses the refrigerant to raise the temperature and the pressure, and the refrigerant gas after raising the temperature and the pressure is mixed with the saturated refrigerant vapor discharged from the first flow passage of the intercooler 3 through the third branch 42 and then enters the gas-liquid separator 41. Since the outlet of the gas-liquid separator 41 is connected to the inlet end of the high-pressure stage compressor 11, the refrigerant vapor returns to the high-pressure stage compressor 11 through the compressor suction pipe to perform the next refrigeration cycle.
Under the low-temperature working condition, the operation mode of the refrigeration system is a single/double-stage switching refrigeration mode, the high-pressure stage compressor 11 is started firstly, at the moment, the second electromagnetic valve 61 and the fourth electromagnetic valve 83 are opened, and the first electromagnetic valve 23 and the third electromagnetic valve 64 are closed. When the temperature of the environmental chamber is reduced to-20 ℃, the low-pressure stage compressor 85 is started, the second electromagnetic valve 61 and the fourth electromagnetic valve 83 are closed, the first electromagnetic valve 23 and the third electromagnetic valve 64 are opened, so that the refrigeration mode is switched, the single-stage compression refrigeration mode is adopted before the switching, and the two-stage compression refrigeration mode is adopted after the switching.
In summary, in this embodiment, the proposed two-stage refrigeration system for the ultra-low temperature environmental chamber has the following characteristics:
1. the utility model discloses an improve on the basis of incomplete cooling refrigerating system in the middle of the one-level throttle and form, can carry out single-stage compression refrigeration mode, doublestage compression refrigeration mode and single/doublestage switch the refrigeration mode, select different refrigeration modes according to the operating mode of difference, can provide the stable low temperature environment that reaches-40 ℃ minimum for the ultra-low temperature environment room, it is showing and improves the coefficient of refrigeration to select single-stage refrigeration mode during middle and high temperature operating mode, select doublestage compression refrigeration mode under the low temperature operating mode, make the environment room reach the settlement temperature value fast.
2. Under the low-temperature working condition, when a single/double-stage switching refrigeration mode is adopted, the energy consumption of the system operation can be reduced; when a double-stage compression refrigeration mode is adopted, the time required for the environment chamber to reach the set temperature can be reduced. The customer can adopt different refrigeration modes under the low-temperature working condition according to different requirements.
3. The refrigerating system adopts a two-stage collocation form, and compared with the traditional ultralow-temperature laboratory refrigerating unit (one set of single-stage compression and one set of double-stage compression), the refrigerating system has the advantages that the components of the refrigerating system are reduced, the cost is reduced, and the initial investment of laboratory construction is favorably reduced.
4. The utility model discloses a two-stage collocation refrigerating system can realize the switching of list/doublestage compression refrigeration mode through opening and close of a plurality of solenoid valves, and control system easily realizes easy operation.
5. The utility model discloses a high-pressure stage compressor is inverter compressor, and when the environment room heat load was high, the frequency rose, and the high-speed operation of compressor improved the refrigerating output, made environment room rapid cooling to required ambient temperature, and when the environment room heat load was low, the frequency reduced, and the compressor low-speed operation maintains environment room temperature. The control system can control the output frequency of the frequency converter to change within the range of 30Hz to 50Hz according to the temperature signal, thereby being beneficial to the energy regulation of the refrigeration system and realizing energy conservation.
6. The utility model discloses a take back hot gas liquid separator can effectively reduce the risk of wet compression, and the effective super-cooled rate of increase refrigerant improves the coefficient of refrigeration, improves the temperature of breathing in of low pressure compressor, prevents that the lubricating oil temperature of low pressure compressor from crossing low excessively, influences the lubricating oil performance.
7. The control system is controlled by the PLC, so that the reliable operation of the refrigerating system is ensured, and the control process is simple, easy to realize and easy to operate.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (10)
1. The utility model provides an ultra-low temperature environment room is with two-stage collocation refrigerating system which characterized in that, includes high-pressure stage compressor, condenser, intermediate pressure expansion valve, intercooler, vapour and liquid separator, takes back vapour and liquid separator, evaporation module and low pressure stage compressor, wherein:
the input port of the condenser is connected with the high-pressure stage compressor, the output port of the condenser is respectively connected with the input ends of a first branch and a second branch, and a first electromagnetic valve and a middle pressure expansion valve are sequentially arranged on the input end of the first branch;
the intercooler is provided with a first inlet, a first outlet, a second inlet and a second outlet, the output end of the first branch is connected with the first inlet, the output end of the second branch is connected with the second inlet, the first outlet is connected with the input port of the gas-liquid separator through a third branch, and the output port of the gas-liquid separator is connected with the input port of the high-pressure stage compressor;
the hot gas liquid separator with the return function is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, the third inlet is connected with the second outlet, an input port of the evaporation module is connected with the third outlet, an output port of the evaporation module is respectively connected with input ends of a fourth branch and a fifth branch, an output end of the fourth branch is connected with the fourth inlet, an output end of the fifth branch is connected with the third branch, and a fourth electromagnetic valve is arranged on the fifth branch; the fourth outlet is connected with the third branch through a sixth branch, and the sixth branch is provided with the low-pressure stage compressor.
2. A two-stage collocation refrigeration system for an ultra-low temperature environment chamber as claimed in claim 1, wherein an oil separator is provided between the output port of the high pressure stage compressor and the input port of the condenser.
3. A two-stage collocation refrigeration system for an ultra-low temperature environment chamber as recited in claim 1 wherein said intercooler is a plate heat exchanger.
4. The two-stage collocation refrigeration system for the ultra-low temperature environment chamber as claimed in claim 1, wherein the evaporation module is of a dual evaporator structure.
5. The two-stage collocation refrigeration system for the ultra-low temperature environment chamber as claimed in claim 4, wherein the evaporation module is composed of a medium temperature evaporation route and a low temperature evaporation route which are connected in parallel, the medium temperature evaporation route is provided with a second solenoid valve, a medium temperature expansion valve and a first evaporator in sequence from the input end, the low temperature evaporation route is provided with a third solenoid valve, a low temperature expansion valve and a second evaporator in sequence from the input end; and a through one-way valve is arranged between the medium-temperature evaporation route and the low-temperature evaporation route, an input port of the one-way valve is connected with a liquid inlet pipe of the second evaporator, and an output port of the one-way valve is connected with a liquid inlet pipe of the first evaporator.
6. A two-stage collocation refrigeration system for an ultra-low temperature environment chamber as recited in claim 5 wherein said first evaporator and said second evaporator are both finned tube evaporators.
7. The two-stage collocation refrigeration system for the ultralow temperature environment chamber as claimed in claim 5, further comprising a control system, wherein the control system comprises a control panel, a PLC controller, an evaporator thermocouple and an environment chamber thermocouple, the control panel is electrically connected with the PLC controller, the PLC controller measures the evaporation temperature of the refrigerant through the evaporator thermocouple, the PLC controller measures the return air temperature of the evaporation module through the environment chamber thermocouple, and the PLC controller is electrically connected with the high-pressure compressor, the first electromagnetic valve, the fourth electromagnetic valve, the evaporation module and the low-pressure compressor respectively.
8. The two-stage collocation refrigeration system for the ultra-low temperature environment chamber as claimed in claim 7, wherein the high pressure stage compressor adopts a frequency conversion technology, i.e. the PLC controller controls the frequency of the high pressure stage compressor through a frequency converter.
9. The two-stage collocation refrigeration system for the ultra-low temperature environment chamber as claimed in claim 7, wherein the condenser is provided with a cooling water inlet and a cooling water outlet, the cooling water inlet is provided with a cooling water circulating pump, and the PLC is electrically connected with the cooling water circulating pump.
10. The two-stage collocation refrigeration system for the ultra-low temperature environment chamber as claimed in claim 7, wherein an evaporator fan is arranged in the evaporation module, the evaporator fan is used for controlling the evaporation rate of the first evaporator and the second evaporator, the evaporator fan adopts a frequency conversion technology, that is, the PLC controller controls the frequency of the evaporator fan through a frequency converter, and the PLC controller is respectively electrically connected with the second electromagnetic valve and the third electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110617655A (en) * | 2019-09-23 | 2019-12-27 | 上海理工大学 | Two-stage collocation refrigerating system for ultralow temperature environment room |
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