KR101246372B1 - An experimental and training apparatus for two-stage compression refrigeration - Google Patents

Abstract

The present invention relates to a two-stage compressed refrigeration frozen laboratory apparatus. According to one aspect of the invention, comprising a control panel unit for controlling the operation of the components of the two-stage refrigeration refrigeration unit and the two-stage refrigeration refrigeration unit, the two-stage refrigeration refrigeration unit is: An evaporator for evaporating the low temperature low pressure refrigerant through heat exchange; A low stage compressor for compressing and discharging the refrigerant passing through the evaporator to an intermediate pressure; A high stage compressor for compressing and discharging the refrigerant sucked from the intermediate cooler at high temperature and high pressure; A high stage condenser for condensing the refrigerant discharged from the high stage compressor to an intermediate cooler; A high stage expansion valve for expanding the refrigerant supplied from the high stage condenser and supplying it to the intermediate cooler, or a subcooling bypass tube for bypassing and expanding a portion of the refrigerant supplied to the intermediate cooler from the high stage condenser and supplying it to the intermediate cooler; The refrigerant supplied from the low stage compressor and the refrigerant introduced through the high stage expansion valve are mixed or the refrigerant supplied from the low stage compressor and the refrigerant mixed through the subcooling bypass pipe and the refrigerant flowing into the high stage condenser are not introduced through the subcooling bypass pipe. An intermediate cooler configured to heat-exchange the refrigerant, supply the liquid refrigerant to the expansion valve for the evaporator, and provide the gaseous refrigerant to the high stage compressor; And an expansion valve for the evaporator for expanding the refrigerant introduced from the intermediate cooler to supply the evaporator. It is proposed a two-stage compression refrigeration freezing laboratory humid apparatus comprising a.

Description

Two stages refrigeration refrigeration laboratory equipment {AN EXPERIMENTAL AND TRAINING APPARATUS FOR TWO-STAGE COMPRESSION REFRIGERATION}

The present invention relates to a two-stage compressed refrigeration frozen laboratory apparatus. Specifically, the present invention relates to an educational two-stage cold storage refrigeration laboratory apparatus for use in experiments and the understanding of the principle of two-stage cold storage refrigeration system for technicians or students in the field of refrigeration and freezing.

In the single stage refrigeration cycle system that has been used in the field of refrigeration and freezing in the past, when the evaporation temperature is about -30 ° C. or less, the evaporation pressure is too low to increase the compression ratio. As a result, the high pressure gas remaining in the clearance of the compressor is disturbed by suction, and the volumetric efficiency is lowered. As the evaporation pressure is low, the specific volume of the gaseous refrigerant is increased, the refrigerant circulation amount is decreased, and the discharge gas temperature is increased to deteriorate the lubricating oil. There is a problem that is easy to be.

Because of this problem, when the evaporation temperature is below a certain level, for example, below -30 ° C, a two-stage compression method is adopted in which the compression is divided into two stages without performing one-stage compression. When the two-stage compression is performed, the compression ratio is reduced to prevent the decrease in volumetric efficiency, and the discharged gas temperature after the two-stage compression can be lowered by cooling and recompressing the discharged gas after the one-stage compression.

Refrigeration freezers of two-stage compression method are commercially available, and two-stage compression method includes two-stage compression one-stage expansion method and two-stage compression two-stage expansion method.

Although two-stage refrigeration refrigerators are commercially available, no educational or training device has been proposed.

 The present invention is to solve the above problems, to provide a technician or students in the field of refrigeration refrigeration two-stage compression refrigeration refrigeration laboratory training apparatus used for understanding the principles of the two-stage refrigeration refrigeration system and experiment of the system. .

More specifically, the two-stage compression refrigeration refrigeration system having a two-stage refrigeration refrigeration unit and a control panel unit for controlling the operation of the configuration of the two-stage refrigeration refrigeration unit, so that the two-stage compression refrigeration for education more easily It is intended to provide a laboratory training device to understand and practice the system.

In addition, according to a preferred aspect of the present invention, to provide an educational two-stage compression refrigeration refrigeration laboratory training apparatus that can easily adjust the temperature or / and pressure of the intermediate cooler.

In order to achieve the above object, according to one aspect of the present invention, comprising a control panel unit for controlling the operation of the two-stage compression refrigeration refrigeration unit and the two-stage compression refrigeration refrigeration unit, two-stage compression refrigeration The refrigeration unit includes: an evaporator installed in the chamber to evaporate the low temperature low pressure refrigerant through heat exchange; A low stage compressor for compressing and discharging the refrigerant passing through the evaporator to an intermediate pressure; A high stage compressor for compressing and discharging the refrigerant sucked from the intermediate cooler at high temperature and high pressure; A high stage condenser for condensing the refrigerant discharged from the high stage compressor to an intermediate cooler; A high stage expansion valve for expanding a refrigerant supplied from the high stage condenser and supplying the medium to the intermediate cooler; The refrigerant introduced through the high stage expansion valve and the refrigerant provided from the low stage compressor are mixed to separate the lower liquid refrigerant and the upper gas phase refrigerant, and the lower liquid refrigerant is supplied to the expansion valve for the evaporator and the gaseous refrigerant is provided to the high stage compressor. Intermediate cooler; And an expansion valve for the evaporator for expanding the refrigerant introduced from the intermediate cooler to supply the evaporator. It is proposed a two-stage compression refrigeration freezing laboratory humid apparatus comprising a.

Preferably, the two-stage compressed refrigeration refrigeration unit further includes a pressure regulating bypass pipe which bypasses a portion of the refrigerant supplied from the high stage condenser before the high stage expansion valve and supplies the intermediate cooler to the intermediate cooler to control the pressure of the intermediate cooler. do.

In order to achieve the above object, according to one aspect of the present invention, comprising a control panel unit for controlling the operation of the two-stage compression refrigeration refrigeration unit and the two-stage compression refrigeration refrigeration unit, two-stage compression refrigeration The refrigeration unit includes: an evaporator installed in the chamber to evaporate the low temperature low pressure refrigerant through heat exchange; A low stage compressor for compressing and discharging the refrigerant passing through the evaporator to an intermediate pressure; A high stage compressor for compressing and discharging the refrigerant sucked from the intermediate cooler at high temperature and high pressure; A high stage condenser for condensing the refrigerant discharged from the high stage compressor to an intermediate cooler; A bypass tube for supercooling that bypasses a portion of the refrigerant supplied from the high stage condenser to the intermediate cooler, and includes an expansion valve to expand the bypassed refrigerant and supply it to the intermediate cooler; It has a closed inner tube which allows the refrigerant supplied without bypassing from the high stage condenser to the expansion valve for evaporator, and the supercooled expanded refrigerant introduced through the subcooling bypass tube and the refrigerant supplied from the low stage compressor An intermediate cooler for cooling the refrigerant flowing through the closed inner tube by the mixed refrigerant of the mixture and providing the mixed refrigerant to the high stage compressor; And an expansion valve for the evaporator for expanding the refrigerant introduced from the intermediate cooler to supply the evaporator. It is proposed a two-stage compression refrigeration freezing laboratory humid apparatus comprising a.

Preferably, the two-stage compression refrigeration refrigeration unit bypasses a portion of the refrigerant supplied from the high stage condenser to the intermediate cooler separately from the subcooling bypass tube and supplies the intermediate cooler to be mixed with the refrigerant supplied from the low stage compressor. It further includes a pressure control bypass pipe for adjusting the pressure of the.

Preferably, the pressure control bypass pipe may include: a pressure drop bypass pipe having a narrow pipe portion for adjusting the pressure of the refrigerant to be lowered to lower the pressure of the intermediate cooler; And a booster bypass tube configured to adjust the pressure to increase the pressure of the intermediate cooler, which includes a pipe having a larger diameter than the pressure drop bypass tube. It is provided.

In addition, preferably, according to another aspect of the present invention, the two-stage compression refrigeration refrigeration unit described above further comprises a low-stage condenser for condensing the refrigerant discharged from the low-stage compressor to the intermediate cooler.

Preferably, the two-stage compression refrigeration refrigeration unit described above further includes a low stage bypass pipe which is installed between the low stage compressor and the intermediate cooler and bypasses the refrigerant discharged from the low stage compressor to the low stage compressor. do.

Preferably, according to yet another aspect of the present invention, the two-stage compressed refrigeration unit described above is installed between the evaporator and the low-stage compressor, and separates the non-evaporated liquid refrigerant from the refrigerant recovered from the evaporator. An accumulator for providing a gaseous refrigerant to the low stage compressor; And a high stage receiver installed between the high stage condenser and the intermediate cooler to temporarily store the refrigerant condensed in the high stage condenser and provide the stored refrigerant to the intermediate cooler. .

Preferably, the two-stage compression refrigeration refrigeration unit described above comprises: a low stage condenser for condensing the refrigerant discharged from the low stage compressor to an intermediate cooler; And a low stage receiver configured to be installed between the low stage condenser and the intermediate cooler, wherein the low stage side condenser provides a refrigerant having undergone condensation in the low stage condenser to the intermediate cooler. It further includes.

Preferably, according to one aspect of the present invention, the two-stage compression refrigeration refrigeration units described above are: for measuring the pressure of the refrigerant flowing into the low stage compressor and the high stage compressor and the refrigerant discharged from the low stage compressor and the high stage compressor. Pressure sensor; And a temperature sensor for measuring the temperature in the chamber; It is provided. More preferably, there is also an intermediate cooler sensor for measuring the temperature or pressure in the intermediate cooler.

More preferably, according to another aspect of the present invention, the above-described control panel unit: to control the control object connected through a plurality of connection terminals, overload breaker, connecting terminal to be connected to the connection jacks to the various control means A power control switch for controlling a power supply for a plurality of lamps, a plurality of lamps for checking whether a control object is connected through a connection terminal, a plurality of on-off switches for on-off operation of a control object connected through a connection terminal, An operation module panel including a plurality of relays and magnetic switches for controlling the operation of the control object connected through the connection terminal, and a pressure switch for controlling the pressure on the control object connected through the connection terminal; And a configuration of the two-stage compressed refrigeration refrigeration unit to be controlled, a plurality of connecting terminals to be connected to the control targets and a part of the plurality of temperature control means through a connecting jack, and a control target connected through the connecting terminal. A graphic module panel including a plurality of temperature control means for controlling temperature; It is provided.

Further preferably, according to another aspect of the present invention, the control panel unit is provided with a switch for controlling the operation of the components of the two stage refrigeration refrigeration unit and a digital thermometer capable of controlling the temperature in the intermediate cooler, The temperature of the refrigerant mixed in the intermediate cooler is controlled according to the temperature set in the thermometer.

Preferably, according to yet another aspect of the present invention, the control panel unit is a pressure control controller capable of controlling the pressure of the mixed refrigerant in the intermediate cooler and the switch for controlling the operation of the components of the two-stage compressed refrigeration refrigeration unit And adjusting the amount or pressure of the refrigerant flowing from the high stage condenser to be mixed in the intermediate cooler or the amount of refrigerant sucked from the intermediate cooler to the high stage compressor according to the pressure set in the pressure control controller. To control the pressure.

Furthermore, preferably, according to another aspect of the present invention, the aforementioned control panel units have an interface that is wired or wirelessly connected to an external computer, and is controlled by an external computer connected to the control panel unit, and via an interface. The temperature, pressure, or temperature and pressure data of the components of the two stage refrigeration refrigeration unit are provided to an external computer.

Although not explicitly mentioned as one preferred aspect of the present invention, embodiments of the present invention in accordance with the various possible combinations of the above-mentioned technical features may be obvious to those skilled in the art.

According to an aspect of the present invention, by including a two-stage compressed refrigeration refrigeration unit having a two-stage compressed refrigeration refrigeration system and a control panel unit for controlling the operation of the configuration of the two-stage refrigerated refrigeration unit, two-stage education more easily It is now possible to provide laboratory equipment for understanding and practicing compressed refrigeration systems.

In addition, according to one embodiment of the present invention, it is possible to provide an educational two-stage compression refrigeration freezing laboratory apparatus that can easily adjust the temperature or / and pressure of the intermediate cooler.

It is apparent that various effects not directly referred to in accordance with various embodiments of the present invention can be derived by those of ordinary skill in the art from the various configurations according to the embodiments of the present invention.

Figure 1 is a schematic block diagram of a two-stage compressed refrigeration frozen laboratory practice apparatus according to an embodiment of the present invention.
Figure 2 is a schematic block diagram of a two-stage compression refrigeration refrigeration laboratory learning apparatus according to another embodiment of the present invention.
Figure 3 is a schematic view showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed refrigerated laboratory experiment apparatus according to an embodiment of the present invention.
Figure 4 is a schematic view showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed refrigerated refrigeration laboratory apparatus according to another embodiment of the present invention.
Figure 5 is a schematic view showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed cold storage laboratory humid apparatus according to another embodiment of the present invention.
Figure 6 is a schematic diagram showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed cold storage laboratory humid apparatus according to another embodiment of the present invention.
Figure 7 is a photograph showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed refrigerator refrigeration laboratory apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of a first embodiment of the present invention; Fig. In the description, the same reference numerals denote the same components, and additional descriptions that may overlap or limit the meaning of the invention may be omitted.

Prior to the detailed description, unless a component is referred to herein as 'directly connected' or 'directly coupled' with another component, one component is simply referred to as 'connected' or 'coupled'. The elements may be connected or coupled 'directly' to the other component, and furthermore in the form in which another component is connected or coupled between them unless contradictory to the description or contrary to the inventive concept. It should be understood that it can exist.

Although singular expressions are set forth herein, it should be noted that they are used in the sense of including a plurality of expressions unless contradictory to the concept of the invention and contradictory or obviously interpreted differently. It is to be understood that the words "comprising", "having", "having", "comprising", etc. in this specification are to be understood as the presence or addition of one or more other features or components or combinations thereof.

1 is a schematic block diagram of a two-stage compressed refrigerated refrigeration laboratory experiment apparatus according to an embodiment of the present invention, Figure 2 is a two-stage compressed refrigerated frozen laboratory practice apparatus according to another embodiment of the present invention Figure 3 is a schematic block diagram, Figure 3 is a schematic diagram showing a two-stage compressed refrigeration refrigeration unit of the two-stage compressed cold storage laboratory apparatus according to an embodiment of the present invention, Figure 4 is another one of the present invention Figure 2 is a schematic view showing a two-stage compressed refrigeration refrigeration laboratory unit of the two-stage compressed refrigerated refrigeration laboratory apparatus according to an embodiment of the present invention, Figure 5 is a two-stage compressed refrigerated refrigerated laboratory experiments of the present invention Figure 2 is a schematic view showing a two-stage compressed refrigeration refrigeration unit, Figure 6 schematically shows a two-stage compressed refrigeration refrigeration unit of the two-stage compressed refrigeration refrigeration laboratory apparatus according to another embodiment of the present invention. 7 is a photograph showing a two-stage compressed refrigerator refrigeration unit of a two-stage compressed refrigerator freezer laboratory apparatus according to an embodiment of the present invention.

First, with reference to Figures 1, 3 and 5, one embodiment of the present invention will be described.

According to one embodiment of the present invention, the two-stage compressed refrigerator refrigeration laboratory apparatus is a control panel unit 300 for controlling the operation of the configuration of the two-stage compressed refrigerator refrigeration unit 100 and the two-stage compressed refrigerator refrigeration unit (100). )

Specifically, referring to FIG. 1, the two-stage compression refrigeration refrigeration unit 100 includes an evaporator 110, a low stage compressor 120, an intermediate cooler 140, a high stage compressor 160, a high stage condenser 170, and a high stage expansion. Valve 190 and expansion valve 180 for the evaporator. In the present exemplary embodiment, the low stage condenser 130, the accumulator 230, the low stage / high stage receivers 240 and 250 illustrated in FIG. 3 will be described. In addition, the pressure regulating bypass pipe 210 and the low end side bypass pipe 260 of FIG. 5 will also be described in an omitted form.

First, referring to FIG. 1, 3 or 7, the low stage side, the evaporator 110 of the two-stage compression refrigeration refrigeration unit 100 is installed in the chamber 109 to evaporate the low-temperature low-pressure refrigerant through heat exchange. The low stage compressor 120 compresses and discharges the refrigerant passing through the evaporator 110 to an intermediate pressure. In the present invention, the intermediate pressure refers to a pressure between the low pressure of the refrigerant flowing into the low stage compressor 120 and the high pressure of the refrigerant flowing out of the high stage compressor 160, rather than the pressure of two points between the low pressure and the high pressure. The expansion valve 180 for the evaporator expands and supplies the refrigerant introduced from the intermediate cooler 140 to the evaporator 110.

Next, referring to FIG. 1 or 3, the high stage compressor 160 may compress and discharge the refrigerant sucked from the intermediate cooler 140 to high temperature and high pressure. The high stage condenser 170 condenses and discharges the refrigerant discharged from the high stage compressor 160. The refrigerant supplied from the high stage condenser 170 is expanded through the high stage expansion valve 190 and is supplied from the high stage expansion valve 190 to the intermediate cooler 140.

The intermediate cooler 140 mixes the refrigerant introduced through the high stage expansion valve 190 and the refrigerant provided from the low stage compressor 120 to separate the lower liquid refrigerant and the upper gas phase refrigerant, and the lower liquid refrigerant for the evaporator. The expansion valve 180 is supplied and the gaseous refrigerant is provided to the high stage compressor 160. In the middle cooler 140, the refrigerant generated at the low stage side and the refrigerant generated through the high stage expansion valve 190 at the high stage side are mixed, and the high stage side is a gas medium refrigerant having a relatively medium temperature and medium pressure that reduces the superheat degree than the refrigerant provided from the low stage side. It is to be sucked into the high stage compressor 160 to reduce the required power of the high stage compressor 160 and to increase the compression efficiency of the high stage compressor (160). In addition, in the intermediate cooler 140, the remaining mixed refrigerant liquid separated from the gaseous refrigerant is supercooled than the refrigerant liquid provided from the lower end side, and reduces the amount of flash gas generated when passing through the expansion valve 180 for the evaporator. In addition, the intermediate cooler 140 may serve to prevent liquid compression in the high stage compressor 160 by supplying the separated gaseous refrigerant.

In the present embodiment, it is provided with a two-stage compressed two-stage expansion structure that is first expanded through the high stage expansion valve 190 and again expanded in the expansion valve 180 for the evaporator. In this embodiment, the amount of the liquid refrigerant under the intermediate cooler 140 discharged to the expansion valve 180 for the evaporator is controlled by the pressure of the expanded refrigerant introduced into the intermediate cooler 140 through the high stage expansion valve 190. Can be. When the amount of the refrigerant provided to the expansion valve 180 for the evaporator in the intermediate cooler 140 is changed, the amount of refrigerant evaporated in the evaporator 110 is changed and in the chamber 109 provided with the evaporator 110 according to the amount of evaporation. The temperature will change. In addition, in the present embodiment, when the amount of the refrigerant expanded through the high stage expansion valve 190 is large, the temperature of the refrigerant mixed in the intermediate cooler 140 is lowered and more subcooled, and the supercooled refrigerant passes through the expansion valve 180 for the evaporator. Since the evaporator 110 is supplied and evaporated, the temperature in the chamber 109 provided with the evaporator 110 may be further lowered.

In this embodiment, referring to Figure 1, the control panel unit 300 is connected to the two-stage compressed refrigeration refrigeration unit 100 to control the operation of the refrigeration refrigeration components according to the user's operation. For example, operation or / and operating capacity change of the low-stage and / or high-stage compressors 120 and 160 or operation or / and operating capacity change of the high-stage condenser 170 or operation and / or operating capacity of the evaporator 110. Can be controlled. 1 and 7, refrigeration refrigeration components, such as evaporator 110, low / high stage compressor (120, 160), intermediate cooler 140, expansion valve for evaporator 180, high stage expansion valve 190 ), The low stage / high stage condenser (130, 170) may be controlled through the operation of the digital thermometer (309). Preferably, the control panel unit 300 may be provided with a lamp 304 or a graphic panel 300b that can know the operating state of the components of the two-stage refrigeration refrigeration unit (100). In addition, the control panel unit 300 is the two-stage compression refrigeration refrigeration unit for the operation state and / or the operating capacity state of the component of the two-stage compression refrigeration refrigeration unit 100, the result of the detection through a pressure gauge or / and a thermometer, etc. Provided to the refrigeration unit 100 can be displayed or transmitted to a computer (not shown) such as an external PC connected by wire or wireless.

Next, another embodiment of the present invention will be described with reference to FIG. 5. 5 is a modification of the embodiment according to FIG. 1 or / and FIG. 3. However, in the present exemplary embodiment, the low stage condenser 130, the accumulator 230, the low stage / high stage receivers 240 and 250 which are not shown in FIG. 1 will be described. In addition, the low end side bypass pipe 260 of FIG. 5 will also be described in an embodiment omitted.

Referring to FIG. 5, in one embodiment of the present invention, the two-stage compression refrigeration refrigeration unit further includes a pressure regulating bypass tube 210. The pressure regulating bypass pipe 210 is for adjusting the pressure of the intermediate cooler 140, and bypasses a part of the refrigerant supplied from the high stage condenser 170 before the high stage expansion valve 190, thereby allowing the intermediate cooler 140 to pass through. To supply. According to an embodiment, the pressure control bypass tube 210 may be a boost bypass tube for raising the pressure of the intermediate cooler 140. When the pressure control bypass pipe 210 is used for boosting pressure, the pressure drop of the intermediate cooler 140 may be adjusted through the high stage expansion valve 190. Alternatively, according to another embodiment, the pressure regulating bypass pipe 210 is not shown, for example, a booster bypass pipe for boosting the pressure of the intermediate cooler 140, for example, 220a and 220b in FIG. 6. And a pressure drop bypass tube for lowering the pressure of the intermediate cooler 140. Preferably, as shown in Figure 5, the pressure regulation bypass pipe 210 may be provided with a solenoid valve (225). When the solenoid valve 225 is provided, the amount of refrigerant bypassed under the control of the solenoid valve 225 is adjusted. Preferably, the pressure control bypass pipe 210 is not a capillary tube that causes a pressure drop when the purpose of boosting pressure is such that a pipe and a pressure drop that are connected to the high stage expansion valve 190 from the high stage condenser 170 are not generated. Use a pipe with a diameter of. According to this embodiment, by varying the pressure inside the intermediate cooler 140 by the refrigerant supplied through the pressure control bypass pipe 210, the amount of refrigerant supplied to the expansion valve for evaporator 180 is changed.

Next, another embodiment of the present invention will be described with reference to FIGS. 2, 4 and 6. According to one embodiment of the present invention, the two-stage compressed refrigeration refrigeration laboratory apparatus is a control panel unit for controlling the operation of the configuration of the two-stage compressed refrigeration refrigeration unit (100 ') and the two-stage refrigerated refrigeration unit (100'). It consists of 300.

Specifically, referring to Figures 2 and 4, the two-stage compression refrigeration refrigeration unit (100 ') is an evaporator 110, low stage compressor 120, intermediate cooler 150, high stage compressor 160, high stage condenser 170 , The supercooling bypass pipe 200 and the expansion valve 180 for the evaporator are made. Tanks 2 and 4 show a two-stage compressed one-stage expansion structure unlike FIGS. In the present exemplary embodiment, the low stage condenser 130, the accumulator 230, the low stage / high stage receivers 240 and 250 illustrated in FIG. 4 will be described. In addition, the boost bypass tube 220a, the pressure drop bypass tube 220b, and the low end side bypass tube 260 of FIG. 6 will also be described in the form of exclusion.

For the evaporator 110, the low stage compressor 120, the high stage compressor 160, the high stage condenser 170, and the expansion valve 180 for the evaporator, the descriptions of the foregoing embodiments will be referred to, and redundant descriptions will be omitted. do. The control panel unit 300 will also be described with reference to the previous embodiment.

2 and 4, in the present embodiment, the subcooling bypass pipe 200 bypasses a part of the refrigerant supplied from the high stage condenser 170 to the intermediate cooler 150, undergoes an expansion process, and the intermediate cooler. Supply to 150. The subcooling bypass pipe 200 includes an expansion valve 205 to expand the refrigerant bypassed.

In addition, the intermediate cooler 150 is a closed inner tube for allowing the refrigerant supplied from the high stage condenser 170 to flow through the expansion valve 180 for the evaporator without being bypassed through the subcooling bypass tube 200 therein ( 153). In the intermediate cooler 150, the refrigerant flowing through the closed inner tube 153 by the mixed refrigerant between the supercooled expanded refrigerant introduced through the subcooling bypass pipe 200 and the refrigerant supplied from the low stage compressor 120 is Is cooled. The intermediate cooler 150 provides such a mixed refrigerant, more specifically, a gaseous mixed refrigerant to the high stage compressor 160. In the intermediate cooler 150, the refrigerant passing through the subcooling bypass pipe 200 is mixed with the refrigerant at the low stage and the high stage condenser 170 without passing the mixed refrigerant and the subcooling bypass pipe 200. Heat exchange is made between the refrigerant introduced from the expansion valve 180 for the evaporator, and the mixed refrigerant is a high stage compressor of the high stage side in a state of gaseous refrigerant having a relatively medium to moderate pressure that reduces the superheat degree than the refrigerant provided from the low stage side. Suction is reduced to the required power of the high stage compressor (160) and increases the compression efficiency of the high stage compressor (160). In addition, since the refrigerant provided to the expansion valve 180 for the evaporator is heat exchanged and supercooled, the amount of flash gas generated when passing through the expansion valve 180 for the evaporator is reduced.

6, another embodiment of the present invention will be described. 6 is a modification of the embodiment according to FIG. 2 or / and 4. However, in the present exemplary embodiment, the low stage condenser 130, the accumulator 230, the low stage / high stage receivers 240 and 250, etc., which are not shown in FIG. 2, and the low stage side bypass pipe 260 of FIG. 6 are excluded. It will be explained in the form.

In this embodiment, the two stage refrigeration refrigeration unit further includes a pressure control bypass tube. The pressure regulating bypass pipe, for example, the boosting bypass pipe 220a and / or the pressure drop bypass pipe 220b, is separated from the supercooling bypass pipe 200 and the intermediate cooler 150 from the high stage condenser 170 side. Part of the refrigerant supplied to the bypass is supplied to be mixed with the refrigerant supplied from the low stage compressor 120 side in the intermediate cooler 150. The pressure control bypass tube controls the pressure of the intermediate cooler 150 by supplying the bypassed coolant such that the bypassed coolant and the refrigerant received from the low stage compressor 120 are mixed in the intermediate cooler 150.

Preferably, according to one embodiment, the pressure control bypass pipe, as shown in Figure 6, having a narrow pipe portion (not shown) to reduce the pressure of the flowing refrigerant of the intermediate cooler 150 The pressure drop bypass tube 220b and the pressure drop bypass tube 220b are adjusted to lower the pressure, and the diameter is larger than that of the intermediate cooler 150. A booster bypass tube 220a is provided. Since the pressure drop occurs when passing through the capillary tube, the pressure drop bypass tube 220b bypasses a portion of the refrigerant supplied from the high stage condenser 170 and lowers the pressure and temperature of the refrigerant. Accordingly, the refrigerant flowing through the closed inner tube 153 inside the intermediate cooler 150 is further cooled and supplied to the expansion valve 180 for the evaporator. Since the boost bypass tube 220a is formed of a larger diameter tube than the pressure drop bypass tube 220b, the pressure drop does not occur, and the intermediate cooler 150 supplies more refrigerant to the intermediate cooler 150. The pressure of the refrigerant mixed in the) increases, and thus the amount of the refrigerant supplied from the intermediate cooler 150 to the high stage compressor 160 is increased. Preferably, the pressure regulating bypass tube, for example, the boost bypass tube 220a or / and the pressure drop bypass tube 220b, is provided with a solenoid valve 225, and is controlled by the solenoid valve 225. The amount of refrigerant passed is controlled.

With reference to Figures 3 to 7 looks at another embodiment of the present invention.

3 to 7, the two-stage compressed refrigeration refrigeration unit in the above-described embodiments further includes a low stage condenser (130). The low stage compressor 130 condenses the refrigerant discharged from the low stage compressor 120 and sends it to the intermediate coolers 140 and 150. In this embodiment, the accumulator 230 shown in FIGS. 3 to 6, the low / high stage receivers 240 and 250, and the pressure regulating bypass pipe 210 shown in FIGS. The pass pipe 220a, the pressure drop bypass pipe 220b, the low end side bypass pipe 260, etc. may be implemented in a form that is omitted, and other embodiments of the type including some of the above-described components are possible. .

In addition, referring to Figures 5 to 6, according to another embodiment of the present invention, the two-stage compressed refrigeration unit is installed between the low stage compressor 120 and the intermediate coolers (140, 150) but the low stage compressor (120) The low stage side bypass pipe 260 for bypassing the refrigerant discharged to the low stage condenser 130 to supply to the intermediate cooler (140, 150). The low stage bypass tube 260 is for supplying the refrigerant discharged from the low stage compressor 120 directly to the intermediate coolers 140 and 150 without operating the low stage condenser 130. Although the accumulators 230, 230a and 230b and the low end and high end receivers 240 and 250 are illustrated in FIGS. 5 to 7, all or some of them may be omitted. have. In addition, the pressure control bypass tube 210, the boost bypass tube 220a and the pressure drop bypass tube 220b shown in FIG. 5 or 6 may be omitted or included.

Preferably, the low stage side bypass pipe 260 is provided with a solenoid valve 265, the refrigerant bypassed by the control of the solenoid valve 265 is blocked or the amount is adjusted. In addition, the low stage bypass pipe 260 further includes a check valve 263 near the point where the low stage side condenser 130 meets the pipe connected from the low stage condenser 130 to the intermediate coolers 140 and 150. Blocks backflow of the refrigerant provided from the low stage condenser 130 to the intermediate coolers 140 and 150. Further, preferably, the solenoid valve 145 which controls the amount of refrigerant discharged from the low stage side receiver 240 is provided before the low stage side bypass pipe 260 is incorporated.

In addition, with reference to Figures 3 to 7 looks at another embodiment of the present invention.

3 to 7, the two-stage compressed refrigeration unit in the above-described embodiments further includes an accumulator (230, 230a) and the high stage side receiver (250). In this embodiment, the low stage condenser 130 and the low stage receiver 240 shown in FIGS. 3 to 6, the pressure regulating bypass tube 210 and the boosting bypass tube 220a of FIG. ) And the pressure drop bypass tube 220b, the low end side bypass tube 260, and the like, may be implemented in other forms, and other embodiments may include some of the above-described components. FIG. 7 illustrates an embodiment in which a low stage receiver is excluded, and an accumulator 230b is further added between the intermediate cooler 140 and the high stage compressor 160 on the high stage side.

 3 to 7, the accumulators 230 and 230a are installed between the evaporator 110 and the low stage compressor 120 to separate the refrigerant of the liquid that is not evaporated from the refrigerant recovered from the evaporator 110. The low stage compressor 120 provides a gaseous refrigerant. The high stage receiver 250 is installed between the high stage condenser 170 and the intermediate coolers 140 and 150, and temporarily stores the refrigerant condensed in the high stage condenser 170 and stores the stored refrigerant as the intermediate coolers 140 and 150. to provide. In addition, as shown in FIG. 7, the accumulator 230b may be further added between the intermediate cooler 140 and the high stage compressor 160 at the high stage side.

In addition, referring to Figures 3 to 6, another embodiment of the present invention, the two-stage compressed refrigeration unit further includes a low stage condenser 130 and a low stage side receiver 240. The low stage condenser 130 condenses the refrigerant discharged from the low stage compressor 120 and sends it to the intermediate coolers 140 and 150. The low stage receiver 240 is installed between the low stage condenser 130 and the intermediate coolers 140 and 150, and provides the refrigerant having undergone condensation in the low stage condenser 130 to the intermediate coolers 140 and 150. In the low stage receiver 240, the refrigerant that has undergone condensation is temporarily stored. Preferably, the present embodiment may provide the intermediate coolers 140 and 150 with the gaseous refrigerant, the liquid refrigerant, or the mixed refrigerant among the refrigerants temporarily stored in the low stage side receiver 240 through the condensation process in the low stage condenser 130. Can be.

3 to 6, preferably, between the low stage receiver 240 and the intermediate coolers 140 and 150, and / or the high stage receiver 250 and the intermediate coolers 140 and 150, a solenoid valve ( 145 and 155 are provided, and the amount of the refrigerant discharged from the low stage side and / or high stage side receivers 240 and 250 is controlled by the control of the solenoid valves 145 and 155. Preferably, referring to Figure 4, the solenoid valve 155 for adjusting the amount of refrigerant discharged from the high stage side receiver 250 is installed before the subcooling bypass pipe 200 is branched. Also, referring to FIGS. 5 and 6, the solenoid valve 155 for adjusting the amount of refrigerant discharged from the high stage receiver 250 may include a pressure control bypass tube 210 and a boost bypass tube 220a. ) And the pressure drop bypass tube 220b may be installed at a point before branching.

In addition, although not shown, a filter drier or / and sight glass may be disposed between the high stage receiver 250 and the intermediate coolers 140 and 150, or between the intermediate coolers 140 and 150 and the expansion valve 180 for the evaporator. Can be installed.

Preferably, with reference to Figures 3 to 7 looks at another embodiment of the present invention. 3 to 7, the two-stage compressed refrigeration unit in the above-described embodiments is a refrigerant in the low stage compressor 120 and the high stage compressor 160 and the low stage compressor 120 and the high stage compressor 160 Pressure sensors 120a, 120b, 160a and 160b for measuring the pressure of the discharged refrigerant are provided. It is also equipped with a temperature sensor (not shown) for measuring the temperature in the chamber 109 including the evaporator 110. More preferably, an intermediate cooler sensor for measuring temperature, pressure, or temperature and pressure in the intermediate coolers 140 and 150 is further provided. Reference numeral 140a of FIG. 7 denotes a pressure gauge indicating the pressure of the intermediate cooler, and unlike the illustrated figure, a digital gauge is also possible. In addition, preferably, the pressure switch 121 is provided to control the pressure of the low / high stage compressor (120, 160). The pressure switch 121 is preferably composed of a high pressure cutoff switch and a low pressure cutoff switch, and may be configured as a digital or analog pressure switch. The temperature, pressure, or temperature and pressure in the intermediate coolers 140 and 150 are measured, and the suction amount and / or discharge pressure of the high stage compressor 160, the pressure control bypass pipe 210, and / or the boost bypass pipe ( 220a) and the intermediate cooler 140 through the control of the solenoid valve in the pressure drop bypass tube 220b, the solenoid valve for controlling the amount of refrigerant discharged from the low end or / and the high stage side receivers (240, 250) Changes in temperature, pressure, or changes in temperature and pressure and the efficiency of the two stage refrigerated refrigeration unit can be observed.

Preferably, with reference to Figure 7 looks at another embodiment of the present invention.

Referring to FIG. 7, according to another embodiment of the present invention, the control panel unit 300 includes an operation module panel 300a and a graphic module panel 300b. The operation module panel 300a is overloaded with a plurality of connection terminals 301 and two-stage refrigerated refrigerating units 100 and 100 'such that connection jacks are connected to various control means, such as various switches and digital thermometers 309. Overload breaker 302 for blocking the control object connected via the connection terminal 301, for example, the evaporator 110, low / high stage compressor (120, 160) in Figures 1 to 6, low / high stage compressor (130, 170) , A power control switch 303 for controlling the supply of control power for controlling the intermediate coolers 140 and 150, and a plurality of lamps 304 for checking whether the control object connected through the connection terminal 301 is operated. ), A plurality of on-off switches 305 for on-off operation of the control object connected through the connection terminal 301, a plurality of relays for controlling the operation of the control object connected through the connection terminal 301 ( Not shown) and the magnetic switch 307, and the connection terminal 301 It includes a pressure switch 308 for controlling the pressure for the control object connected via. The pressure switch 308 may preferably be composed of a high pressure and a low pressure shut off switch. Reference numeral 206 shown in FIG. 7 denotes a relay base on which a relay is installed. In addition, as shown in FIG. 7, a timer 310, a thermal relay 311, a voltmeter 312, an ammeter 313, and the like may be further added. In the operation module panel 300a, the commercial power is converted into a control power supply, for example, a 24V DC power supply, and the control power is supplied to various control means through the operation of the power control switch 303.

Graphic module panel 300b is shown in the configuration of the two-stage compressed refrigerator refrigeration unit (100, 100 ') to be controlled, the control object and a plurality of temperature control means, such as a part of the digital thermometer 309 through a connecting jack It includes a plurality of connection terminals 301 to be connected to and a plurality of temperature control means, for example, a digital thermometer 309 for controlling the temperature of the control object connected through the connection terminal 301.

More preferably, referring to another embodiment of the present invention with reference to Figure 7, the control panel unit 300, for example, various switches for controlling the operation of the components of the two-stage compression refrigeration refrigeration unit (100, 100 '), for example And a power control switch 303, various on-off switches 305, relays and magnetic switches 307, thermal relays 311, pressure switches 308, timers 310, and the like. In addition, it is provided with a digital thermometer that can control the temperature in the intermediate cooler (140, 150). According to the temperature set in the digital thermometer of the control panel unit 300, the temperature of the refrigerant mixed in the intermediate coolers 140 and 150 is controlled. 7, the evaporator chamber 309, the low stage / high stage compressors 120 and 160, the low stage / high stage compressors 130 and 170, and the expansion valve for the evaporator as well as the temperature in the intermediate coolers 140 and 150. 180, a digital thermometer 309 for controlling the temperature of the refrigerant in or passing through the high stage expansion valve 190 is provided.

Further preferably, according to another embodiment of the present invention, the control panel unit 300 is a switch and the intermediate cooler (140, 150) for controlling the operation of the components of the two stage refrigeration refrigeration unit (100, 100 ') And a pressure control controller capable of controlling the pressure of the mixed refrigerant in the chamber, for example, the pressure switch 308 of FIG. The amount of refrigerant sucked from the intermediate coolers 140 and 150 to the high stage compressor 160 or mixed in the intermediate coolers 140 and 150 according to the pressure set in the pressure control controller or the pressure switch 308, for example, the high pressure / low pressure cut-off switch. The pressure of the mixed refrigerant in the intermediate coolers 140 and 150 is controlled by adjusting the amount or the pressure of the refrigerant flowing from the high stage condenser 170 side as much as possible. In addition, referring to FIG. 7, a pressure switch 141 for controlling the pressure of the intermediate coolers 140 and 150 may be provided in the two-stage compression refrigeration refrigeration unit (100, 100 '). More preferably, the control panel unit 300 is a digital thermometer that can control the temperature in the intermediate cooler (140, 150), for example, next to the evaporator shown graphically in the graphic module panel (300b in Figure 7) digital thermometer ( 309 is further provided to control the temperature or / and pressure of the refrigerant mixed in the intermediate coolers 140 and 150 according to the temperature set in the digital thermometer and / or the pressure control controller, for example, the pressure set in the pressure switch 309. do.

Furthermore, preferably, according to another embodiment of the present invention, although not shown, the control panel unit 300 in the above-described embodiments is provided with an interface that is wired or wirelessly connected to an external computer. Further, setting control is performed by an external computer connected to the control panel unit 300. Then, the temperature, pressure, or temperature and pressure data of the components of the two stage refrigeration refrigeration unit (100, 100 ') are provided to an external computer through the interface.

In the above, the foregoing embodiments and the accompanying drawings are described by way of example to assist those of ordinary skill in the art to understand the present invention, and should be considered as illustrative rather than limiting. Accordingly, various embodiments of the invention may be embodied in various forms without departing from the essential characteristics thereof, and the scope of the invention should be construed in accordance with the invention as set forth in the appended claims. Alternatives, and equivalents by those skilled in the art.

100, 100 ': 2-stage compressed refrigeration unit 110: evaporator
120: low stage compressor 130: low stage compressor
140, 150: intermediate cooler 145, 155, 225, 265: solenoid valve
160: high stage compressor 170: high stage compressor
180: expansion valve for evaporator 190: high stage expansion valve
200: subcooling bypass tube 205: subcooling expansion valve
210: pressure regulating bypass pipe 230, 230b: accumulator
240: low stage receiver 250: high stage receiver
260: low side bypass tube 300: control panel unit
300a: operation module panel 300b: graphic module panel

Claims (14)

It comprises a control panel unit for controlling the operation of the two-stage compression refrigeration refrigeration unit and the two-stage compression refrigeration refrigeration unit,
The two stage compressed refrigeration unit is:
An evaporator installed in the chamber and evaporating a low temperature low pressure refrigerant through heat exchange;
A low stage compressor for compressing the refrigerant passing through the evaporator to an intermediate pressure and discharging the refrigerant to an intermediate cooler;
A high stage compressor for compressing and discharging the refrigerant sucked from the intermediate cooler at high temperature and high pressure;
A high stage condenser for condensing and discharging the refrigerant discharged from the high stage compressor;
A high stage expansion valve for expanding a refrigerant supplied from the high stage condenser and supplying the medium to a middle cooler;
The refrigerant introduced through the high stage expansion valve and the refrigerant provided from the low stage compressor are mixed to separate the lower liquid refrigerant and the upper gas phase refrigerant, the lower liquid refrigerant is supplied to the expansion valve for the evaporator, and the gaseous refrigerant is supplied to the expansion valve. An intermediate cooler for providing a high stage compressor;
A pressure regulating bypass pipe which bypasses a portion of the refrigerant supplied from the high stage condenser before the high stage expansion valve and supplies the medium to the intermediate cooler to control the pressure of the intermediate cooler; And
An expansion valve for the evaporator for expanding the refrigerant introduced from the intermediate cooler and supplying the refrigerant to the evaporator; Two-stage compression refrigeration refrigeration laboratory learning device comprising a.
delete It comprises a control panel unit for controlling the operation of the two-stage compression refrigeration refrigeration unit and the two-stage compression refrigeration refrigeration unit,
The two stage compressed refrigeration unit is:
An evaporator installed in the chamber and evaporating a low temperature low pressure refrigerant through heat exchange;
A low stage compressor for compressing the refrigerant passing through the evaporator to an intermediate pressure and discharging the refrigerant to an intermediate cooler;
A high stage compressor for compressing and discharging the refrigerant sucked from the intermediate cooler at high temperature and high pressure;
A high stage condenser for condensing and discharging the refrigerant discharged from the high stage compressor;
A bypass tube for supercooling that bypasses a portion of the refrigerant supplied from the high stage condenser to the intermediate cooler, and includes an expansion valve to expand the bypassed refrigerant and supply it to the intermediate cooler;
It has a closed inner tube to allow the refrigerant supplied from the high stage condenser to bypass the high-pressure condenser flows into the expansion valve for the evaporator, and is supplied from the sub-cooled expanded refrigerant and the low stage compressor introduced through the sub-cooling bypass tube An intermediate cooler that cools the refrigerant flowing through the closed inner tube by the mixed refrigerant with the received refrigerant and provides the mixed refrigerant to the high stage compressor; And
An expansion valve for the evaporator for expanding the refrigerant introduced from the intermediate cooler and supplying the refrigerant to the evaporator; Two-stage compression refrigeration refrigeration laboratory learning device comprising a.
The method of claim 3, wherein the two stage refrigeration refrigeration unit,
A pressure for controlling the pressure of the intermediate cooler by bypassing a part of the refrigerant supplied from the high stage condenser to the intermediate cooler separately from the supercooling bypass pipe so as to be mixed with the refrigerant supplied from the low stage compressor in the intermediate cooler. A two-stage compression refrigeration and freezing laboratory apparatus further comprising a control bypass tube.
The method of claim 4,
The pressure control bypass pipe may include: a pressure drop bypass pipe configured to reduce the pressure of the intermediate cooler by lowering the pressure of the refrigerant having a thin pipe portion; And a booster bypass tube configured to adjust a pressure to increase the pressure of the intermediate cooler, which is made of a larger diameter tube than the pressure drop bypass tube. Two-stage compression refrigeration refrigeration laboratory learning device characterized in that it comprises a.
The method according to any one of claims 1, 3, 4, 5,
The two stage compressed refrigeration unit comprises: a low stage condenser for condensing the refrigerant discharged from the low stage compressor to the intermediate cooler; Two-stage compression refrigeration refrigeration laboratory learning device further comprising a.
The method of claim 6,
The two-stage compression refrigeration refrigeration unit further includes a low stage bypass pipe installed between the low stage compressor and the intermediate cooler and bypassing the refrigerant discharged from the low stage compressor to the low stage compressor to the intermediate cooler. Two-stage compressed cold storage laboratory equipment.
The method according to any one of claims 1, 3, 4, 5,
The two stage compressed refrigeration unit is:
An accumulator disposed between the evaporator and the low stage compressor, the accumulator separating the liquid refrigerant not evaporated from the refrigerant recovered from the evaporator and providing a gaseous refrigerant to the low stage compressor; And
A high stage receiver installed between the high stage condenser and the intermediate cooler to temporarily store the refrigerant condensed in the high stage condenser and provide the stored refrigerant to the intermediate cooler; Two-stage compression refrigeration refrigeration laboratory learning device further comprising a.
The method according to claim 8,
The two stage compressed refrigeration unit comprises: a low stage condenser for condensing the refrigerant discharged from the low stage compressor to the intermediate cooler; And a low stage receiver configured to be installed between the low stage condenser and the intermediate cooler to provide a refrigerant having undergone condensation in the low stage condenser to the intermediate cooler. Two-stage compression refrigeration refrigeration laboratory learning device further comprising a.
The method according to any one of claims 1, 3, 4, 5,
The two-stage compressed refrigeration unit includes: a pressure sensor for measuring the pressure of the refrigerant flowing into the low stage compressor and the high stage compressor and the refrigerant discharged from the low stage compressor and the high stage compressor; A temperature sensor for measuring a temperature in the chamber; And an intermediate cooler sensor for measuring a temperature or pressure in the intermediate cooler; Two-stage compression refrigeration refrigeration laboratory learning device characterized in that it further comprises.
The method according to any one of claims 1, 3, 4, 5,
The control panel unit is:
A plurality of connection terminals for connecting a connection jack to various control means, an overload circuit breaker, a power control switch for controlling a power supply for controlling a control object connected through the connection terminal, and a control terminal connected through the connection terminal A plurality of lamps for checking whether the operation, a plurality of on-off switch for the on-off operation of the control object connected through the connection terminal, a plurality of for controlling the operation of the control object connected through the connection terminal An operation module panel including a relay, a magnetic switch, and a pressure switch for controlling a pressure on the control target connected through the connection terminal; And
The configuration of the two-stage compressed refrigeration refrigeration unit to be the control object is shown, a plurality of connection terminals to be connected to the control targets and a portion of the plurality of temperature control means through the connection jack, and is connected through the connection terminal A graphic module panel including a plurality of temperature control means for controlling the temperature of the control object; Two-stage compression refrigeration refrigeration laboratory learning device characterized in that it comprises a.
The method according to any one of claims 1, 3, 4, 5,
The control panel unit includes a switch for controlling the operation of the components of the two-stage compression refrigeration refrigeration unit and a digital thermometer for controlling the temperature in the intermediate cooler, and mixed in the intermediate cooler according to the temperature set in the digital thermometer. A two-stage compressed cold storage laboratory training device characterized in that for controlling the temperature of the refrigerant.
The method according to any one of claims 1, 3, 4, 5,
The control panel unit is provided with a switch for controlling the operation of the components of the two-stage compressed refrigeration refrigeration unit and a pressure control controller for controlling the pressure of the mixed refrigerant in the intermediate cooler, and the pressure set in the pressure control controller Accordingly, the pressure of the mixed refrigerant in the intermediate cooler is controlled by adjusting the amount or pressure of the refrigerant flowing into the high stage compressor from the intermediate cooler or mixing from the high stage compressor to mix in the intermediate cooler. Two stage compression refrigeration freezing laboratory equipment.
The method according to any one of claims 1, 3, 4, 5,
The control panel unit has an interface that is wired or wirelessly connected to an external computer,
Controlled by an external computer connected to the control panel unit,
And provide temperature, pressure, or temperature and pressure data of the components of the two stage refrigerated refrigeration unit to the external computer via the interface.

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