JP5793745B2 - Cooling trap device - Google Patents

Description

The present invention related to cooling trap apparatus and, more particularly, the solvent vapor to be evacuated by vacuum drying at room temperature and concentrated under reduced pressure, and condensed or frozen is introduced into the trap vessel which is cooled to a low temperature by the refrigerant of the refrigerator about the cold trap device for trapping.

  There is known a cooling trap device for cooling and collecting liquefied or solidified vapor discharged by vacuum room temperature drying or vacuum concentration. The cold trap device cools the trap tank to a low temperature by circulating a low-temperature refrigerant from the refrigeration cycle through a cooling channel provided in the trap tank, and liquefies or solidifies the solvent vapor by cooling the solvent tank in the low-temperature trap tank. (See, for example, Patent Document 1).

JP 2008-23479A

  When a large amount of solvent vapor is generated over a long period of time during drying or concentration operations, a large amount of solid matter (frost) adheres to the trap tank or a large amount of liquid is trapped in the trap tank. In some cases, the capacity of the cooling trap device may be reduced.

  In this case, it is necessary to use a large-capacity cold trap device or switch between multiple cold trap devices, and in any case, the solvent vapor collection operation will be temporarily suspended, and The cost required for operation was a factor. In addition, in the cold trap device for physics and chemistry experiments, since organic solvent vapor may be collected, it is necessary to prevent leakage of the organic solvent to the outside when removing solids and liquid in the trap tank. is there.

The present invention aims at providing a large number of even solvent vapor as occurs, a cold trap equipment capable prolonged continuous operation when performing vacuum dried at room temperature and concentrated under reduced pressure.

In order to achieve the above object , solvent vapor is introduced into a trap tank cooled by a low-temperature refrigerant flowing through the evaporator of a refrigeration cycle including a compressor, a condenser, an expansion valve and an evaporator according to the present invention, A first configuration of a cold trap device that cools and collects solvent vapor in a trap tank includes a plurality of trap tanks and a liquid storage tank that stores a liquid containing a liquid for defrosting , and the plurality of traps The tank includes a solvent vapor inflow path for allowing the solvent vapor to flow into the trap tank, a steam inflow valve provided in the solvent vapor inflow path, an exhaust path for evacuating the trap tank, and an exhaust provided in the exhaust path. gas inlet path for introducing a valve, a trap tank bottom and the liquid storage tank and a connection to the liquid introduced deriving path and said liquid introducing derived liquid introduction deriving valve provided in the path, the gas in the trap vessel Each comprise a fine the gas inlet passage gas inlet valve provided in the refrigerating cycle, comprising a heater for heating the liquid for defrosting of the liquid storage tank by a high-temperature high-pressure refrigerant compressed by the compressor A plurality of high-temperature refrigerant paths, the condenser for condensing the high-temperature high-pressure refrigerant that has passed through the high-temperature refrigerant path, and a plurality of high-pressure refrigerants condensed in the condenser for introduction into a plurality of evaporators provided in each trap tank. High-pressure refrigerant paths, high-pressure refrigerant valves provided in the high-pressure refrigerant paths, expansion valves that expand the high-pressure refrigerant that has passed through the high-pressure refrigerant valves, and low-temperature refrigerant that has been expanded by the expansion valves are introduced into the evaporators. A low-temperature refrigerant introduction path, a gaseous refrigerant deriving path for deriving the gaseous refrigerant evaporated in each evaporator from each evaporator, and a gaseous refrigerant derived from one evaporator to the gaseous refrigerant deriving path. A refrigerant introduction path for pre-cooling to be introduced into the evaporator, and compressor suction path for circulating sucked into the compressor via the compressor suction valve gaseous refrigerant derived to the gaseous refrigerant outlet path, for the pre-cooling is introduced from the refrigerant introduction path into the other evaporator and a pre-cooling refrigerant circulating path for circulating sucked into the compressor through the precooling valve refrigerant precooling derived the other evaporator, a plurality of trap tank In one of the trap tanks, the steam inlet valve, the exhaust valve, the high-pressure refrigerant valve, and the compressor intake valve of the one trap tank are opened, and the gas inlet valve and the liquid inlet / outlet valve are closed. Vapor collection that cools and solidifies the solvent vapor flowing from the solvent vapor inflow path into the one trap tank by introducing a low-temperature refrigerant into the trap tank evaporator to cool the one trap tank. Do the process When the other trap tank is open, the liquid inlet / outlet valve is opened with the steam inlet valve, the exhaust valve, the high-pressure refrigerant valve and the gas inlet valve of the other trap tank closed, and the defrost is heated with the high-temperature / high-pressure refrigerant. A heating and melting stage for sucking liquid from the liquid storage tank and liquefying the frost adhering to the cooling surface of the other trap tank by heating and dissolving with the defrosting liquid; A liquid discharge stage for introducing gas into the trap tank and returning the defrosting liquid including the liquid liquefied by frost melting to the liquid storage tank, and closing the liquid introduction derivation valve and the gas inflow valve, exhaust valve and pre-cooling A gaseous refrigerant derived from an evaporator of one trap tank that opens a valve and performs a vapor collecting process is introduced into the evaporator of another trap tank, and the gaseous refrigerant passes through the evaporator of the other trap tank. A regeneration process including a pre-cooling stage in which the compressor is sucked into the compressor. It is characterized by carrying out switching between regeneration step and the vapor absorption step in a plurality of trap tank.

Further, in the second configuration, the high-temperature refrigerant path includes a bypass path that bypasses the heater and a bypass valve provided in the bypass path in parallel with the heater, and the steam of the one trap tank The inflow valve, the exhaust valve, the high-pressure refrigerant valve, and the compressor intake valve are opened, the gas inflow valve and the liquid introduction / derivation valve are closed, and a low-temperature refrigerant is introduced into the evaporator of the one trap tank. When the trapping step of cooling and trapping the solvent vapor flowing from the solvent vapor inflow path into the one trapping tank by cooling the trapping tank is performed in the one trapping tank, The bypass valve is opened, and the high-temperature and high-pressure refrigerant that bypasses the heater is caused to flow to the condenser via the bypass path. In other trap tanks, a steam inlet valve, an exhaust valve, and an exhaust valve of the other trap tank are used. With the high-pressure refrigerant valve closed, the gas inflow valve and the liquid introduction / delivery valve are opened to introduce the gas into the other trap tank and discharge the liquid collected in the other trap tank to the liquid storage tank. The liquid discharge stage, the liquid inlet / outlet valve and the gas inflow valve are closed, the exhaust valve and the precooling valve are opened, and the gaseous refrigerant derived from the evaporator of one trap tank performing the vapor collection process is transferred to the other trap tank. In the first configuration and the second configuration, including a pre-cooling step in which a gaseous refrigerant having passed through the evaporator in the other trap tank is sucked into the compressor . When the plurality of trap tanks are three tanks, the second trap tank performs the heating and dissolving stage and the liquid discharging stage when the first trap tank is performing the vapor collecting process, and the third trap tank The tank is characterized by performing a pre-cooling stage .

The third configuration includes a plurality of trap tanks and a liquid storage tank that stores a liquid containing a defrosting liquid, and the plurality of trap tanks cause the solvent vapor to flow into the trap tank. Connecting the inflow path and the steam inflow valve provided in the solvent vapor inflow path, the exhaust path for evacuating the inside of the trap tank, the exhaust valve provided in the exhaust path, and the bottom of the trap tank and the liquid storage tank A liquid introduction / extraction path, a liquid introduction / extraction valve provided in the liquid introduction / extraction path, a gas inflow path for allowing gas to flow into the trap tank, and a gas inflow valve provided in the gas inflow path, respectively. The refrigeration cycle includes a high-temperature refrigerant path that discharges the high-temperature and high-pressure refrigerant compressed by the compressor, the condenser that condenses the high-temperature and high-pressure refrigerant that has passed through the high-temperature refrigerant path, and the high-pressure refrigerant that is condensed in the condenser. A plurality of high-pressure refrigerant paths for introduction into the plurality of evaporators provided in the respective trap tanks, high-pressure refrigerant valves respectively provided in the high-pressure refrigerant paths, and high-pressure refrigerant that has passed through the high-pressure refrigerant valves are expanded. An expansion valve, a low-temperature refrigerant introduction path for introducing the low-temperature refrigerant expanded by each expansion valve into each evaporator, a gaseous refrigerant deriving path for deriving the gaseous refrigerant evaporated by each evaporator from each evaporator, A precooling refrigerant introduction path for introducing the gaseous refrigerant derived from one evaporator into the gaseous refrigerant extraction path to another evaporator, and a compressor intake valve for the gaseous refrigerant derived from the gaseous refrigerant extraction path. A pre-cooling refrigerant introduced into the other evaporator through the pre-cooling refrigerant introduction path and led to the other evaporator through the pre-cooling valve. Circulating suction into the machine And a pre-cooling refrigerant circulation path for, in one trap tank of the plurality of trap tank, said one of the trap tank of the steam inlet valve, exhaust valve, respectively a high-pressure refrigerant valve and compressor suction valve open gas inlet valve And the liquid inlet / outlet valve is closed, and a low-temperature refrigerant is introduced into the evaporator of the single trap tank to cool the single trap tank, thereby flowing into the single trap tank from the solvent vapor inflow path. when you are the the solvent vapor by performing a vapor collection step of collecting by cooling liquefaction, in other trap tank, gas is closed steam admission valves of the other trap tank, an exhaust valve and the high pressure refrigerant valve A liquid discharge stage for opening the inflow valve and the liquid introduction / derivation valve, introducing a gas into the other trap tank, and discharging the liquid collected in the other trap tank to the liquid storage tank; and a liquid introduction / derivation valve And gas inlet valve Close and open the exhaust valve and precooling valve, introduce the gaseous refrigerant derived from the evaporator of one trap tank that is performing the vapor collection process into the evaporator of the other trap tank, and evaporate the other trap tank A regeneration process including a precooling step for sucking the gaseous refrigerant that has passed through the compressor into the compressor is performed, and the steam collecting process and the regeneration process are switched in a plurality of trap tanks.

Further, in the third configuration, when the plurality of trap tanks are three tanks, the second trap tank performs a liquid discharge stage when the first trap tank is performing the vapor collecting step, 3 trap tanks are characterized by performing the pre-cooling stage. In the first to third configurations, the liquid storage tank may be configured to overflow the liquid in the liquid storage tank when the liquid level of the liquid in the liquid storage tank exceeds a preset height. An overflow path 19 for discharging from the storage tank is provided .

  According to the present invention, since a plurality of trap tanks can be operated by switching between a vapor collection step and a regeneration step, even when the amount of solvent vapor to be trapped is large, the solvent vapor is continuously collected for a long time. Can be collected.

It is a systematic diagram of the principal part which shows one example of the cooling trap apparatus of this invention. It is a systematic diagram which shows one example of the refrigerating cycle in the cold trap apparatus provided with two trap tanks. It is explanatory drawing which shows the flow of a refrigerant | coolant when a collection process is started in one trap tank, and a defrost process or a collection liquid discharge process is started by the other trap tank. It is explanatory drawing which shows the flow of a refrigerant | coolant when the pre-cooling step is similarly performed in the other trap tank. It is explanatory drawing which shows the flow of a refrigerant | coolant when similarly switching one trap tank to a defrost process or a collection liquid discharge process, and switching the other trap tank to a collection process. It is explanatory drawing which shows the flow of a refrigerant | coolant when the pre-cooling step is similarly performed in one trap tank.

  The cold trap apparatus shown in this embodiment includes two trap tanks 11a and 11b, a refrigeration cycle 12 for cooling the trap tanks 11a and 11b, and a heating tank 13 provided in the path of the refrigeration cycle 12. And.

  In each of the trap tanks 11a and 11b, the solvent vapor inflow paths 14a and 14b through which the solvent vapor generated in the drying apparatus and the concentrating apparatus flows into the trap tanks 11a and 11b, and the trap tanks 11a and 11b are evacuated. Exhaust paths 15a, 15b, liquid introduction / derivation paths 16a, 16b connecting the bottoms of the trap tanks 11a, 11b and the heating tank 13, and gas inflow paths for allowing gas to flow into the trap tanks 11a, 11b 17a and 17b are provided.

  The solvent vapor inflow paths 14a and 14b have steam inflow valves 14Va and 14Vb, the exhaust paths 15a and 15b have exhaust valves 15Va and 15Vb, and the liquid introduction / derivation paths 16a and 16b have liquid introduction / derivation valves 16Va and 16Vb. However, gas inlet valves 17Va and 17Vb are provided in the gas inlet paths 17a and 17b, respectively.

  The refrigeration cycle 12 includes a compressor 21 that compresses refrigerant into a gaseous high-temperature and high-pressure refrigerant, and a condenser 22 that cools and condenses the high-temperature and high-pressure refrigerant discharged from the compressor 21 to the high-temperature refrigerant path 31. Expansion valves 23a and 23b for expanding the liquid high-pressure refrigerant condensed in the condenser 22 and led to the two high-pressure refrigerant paths 32a and 32b via the high-pressure refrigerant valves 32Va and 32Vb, and the expansion valves 23a and 23b. And the evaporators 24a and 24b for evaporating the low-pressure liquid low-pressure refrigerant led to the low-temperature refrigerant introduction paths 33a and 33b, and evaporated by the evaporators 24a and 24b to the gaseous refrigerant lead-out paths 34a and 34b. One of the compressor suction path 35 and the evaporators 24a and 24b, where the derived gaseous refrigerant is merged and then circulated to the suction side of the compressor 21 via the compressor suction valve 35V. The gaseous refrigerant led out to either one of the gaseous refrigerant lead-out paths 34a, 34b is introduced into the other evaporator 24a, 24b as a precooling refrigerant, and the precooling refrigerant lead-out path 36a from the evaporators 24a, 24b. , 36b are provided with precooling refrigerant circulation paths 37a, 37b for circulating the precooling refrigerant led to the suction side of the compressor 21 via precooling valves 36Va, 36Vb.

  The said heating tank 13 is a tank for storing the liquid containing the liquid for defrost, Comprising: The heating tank 13 heats the liquid in the heating tank 13 by using the high temperature / high pressure refrigerant | coolant which flows through the high temperature refrigerant path 31 as a heating source. A heater 31a for heating, a drain valve 18 for discharging the liquid in the heating tank 13 from the bottom of the tank, and heating when the liquid level of the liquid in the heating tank 13 exceeds a preset height. An overflow path 19 for overflowing the liquid in the tank 13 and discharging it from the heating tank 13 is provided.

  The trap tanks 11a and 11b shown in this embodiment have a part of the evaporators 24a and 24b wound around the outer periphery of the tank body, and the entire inner surface of the tank is used as a cooling surface. Further, in the refrigeration cycle 12 shown in this embodiment, a bypass path 38 that bypasses the heater 31a is provided in parallel with the heater 31a, and when the liquid in the heating tank 13 does not need to be heated, a bypass is provided. By opening the bypass valve 38V provided in the path 38, the high-temperature and high-pressure refrigerant flows into the condenser 22 without passing through the heater 31a.

  Hereinafter, using the cooling trap apparatus shown in the present embodiment, the operation procedure for continuous operation for a long time in the first operation method in which the solvent vapor is cooled and solidified in the trap tanks 11a and 11b and collected will be described. To do. When the solvent vapor is solidified and collected, a predetermined amount of defrosting liquid is introduced into the heating tank 13. In addition, the drain valve 18 in the heating tank 13 is kept in a closed state, and when the overflow valve 19 is provided in the overflow path 19, the overflow valve 19V is kept in an open state and the inside of the heating tank 13 is at atmospheric pressure. It is in a state.

  One trap tank (hereinafter referred to as the first trap tank) 11a was switched from the regeneration process to the steam collecting process, and the other trap tank (hereinafter referred to as the second trap tank) 11b was switched from the steam collecting process to the regeneration process. In the first trap tank 11a, the steam inlet valve 14Va, the exhaust valve 15Va, the high-pressure refrigerant valve 32Va, and the compressor intake valve 35V related to the first trap tank 11a are opened, and the gas inlet valve 17Va and the liquid introduction / derivation valve 16Va are closed.

  Thereby, as shown by a solid line in FIG. 3, the refrigerant circulating in the refrigeration cycle 12 is compressed by the compressor 21, condensed by the condenser 22, and expanded by the expansion valve 23a. The cooling surface of the first trap tank 11a is cooled by the low-temperature refrigerant introduced into the evaporator 24a of the first trap tank 11a through the 33a and evaporated in the evaporator 24a, and the gaseous refrigerant lead-out path 34a from the evaporator 24a. The low-temperature refrigerant led to is circulated to the suction side of the compressor 21 through the compressor suction path 35 via the compressor suction valve 35V.

  Further, the inside of the first trap tank 11a is depressurized through an exhaust passage 15a connected to a vacuum pump (not shown), so that the solvent vapor generated in the drying device and the concentrating device is sucked and the solvent vapor inflow passage 14a. Then, it flows into the first trap tank 11a and is cooled inside the first trap tank 11a, so that it is solidified in the form of frost on the cooling surface and collected in the first trap tank 11a. At this time, in the heating tank 13, the defrosting liquid in the heating tank 13 is heated by the high-temperature and high-pressure refrigerant flowing through the heater 31a.

  On the other hand, in the second trap tank 11b, the first heating and melting stage in the regeneration process starts, and the steam inlet valve 14Vb, the exhaust valve 15Vb, the high-pressure refrigerant valve 32Vb, and the gas inlet valve 17Vb related to the second trap tank 11b are connected. In a closed state, the flow of the solvent vapor into the second trap tank 11b is blocked, and the introduction of the low-pressure refrigerant to the evaporator 24b is blocked. When the liquid introduction / derivation valve 16Vb is opened in this state, the liquid is introduced through the liquid introduction / derivation path 16b into the second trap tank 11b, which is decompressed by the vacuum pump in the vapor collection process before entering the regeneration process. The defrosting liquid heated to a preset temperature is sucked up from the tank 13. Thereby, the inside of the 2nd trap tank 11b will be in the state filled with the heated defrosting liquid, and the solvent solidified thing which solidified and collected in the frost form on the cooling surface of the 2nd trap tank 11b will defrost. It is heated and dissolved in the liquid for use to become a liquid, and is mixed in the liquid for defrosting.

  After finishing the heating and melting stage for a preset time, the process enters the second liquid discharge stage in the regeneration process, and the gas inlet valve 17Vb is opened while the liquid introduction / derivation valve 16Vb is kept open. Thereby, gas, for example, air flows into the second trap tank 11b through the gas inflow path 17b, and the defrosting liquid including the liquid liquefied by the frost in the second trap tank 11b is liquefied by its own weight. It flows down from the introduction / derivation path 16 b toward the heating tank 13.

  The second trap tank 11b that has discharged the defrosting liquid at the liquid discharge stage enters the third precooling stage in the regeneration process, closes the liquid introduction / derivation valve 16Vb and the gas inflow valve 17Vb, and opens the exhaust valve 15Vb, Vacuum evacuation in the second trap tank 11b starts. Further, the compressor intake valve 35V is closed and the precooling valve 36Vb is opened.

  As a result, as shown by the solid line in FIG. 4, the refrigerant is introduced into the evaporator 24a of the first trap tank 11a from the low-temperature refrigerant introduction path 33a, and is cooled to the gaseous refrigerant lead-out path 34a after cooling the first trap tank 11a. Since the compressor suction valve 35V is closed, the low-temperature refrigerant flows back in the gaseous refrigerant lead-out path 34b of the second trap tank 11b, and is introduced to the outlet side of the evaporator 24b of the second trap tank 11b to be supplied to the evaporator 24b. The second trap tank 11b is cooled by passing through and is led out to the low-temperature refrigerant introduction path 33b from the inlet side of the evaporator 24b. The low-temperature refrigerant led out to the low-temperature refrigerant introduction path 33b passes through the pre-cooling refrigerant lead-out path 36b through the pre-cooling valve 36Vb, and further circulates from the pre-cooling refrigerant circulation path 37b to the suction side of the compressor 21 through the compressor suction path 35. To do. Therefore, the second trap tank 11b is pre-cooled to a preset pre-cooling temperature by the low-temperature refrigerant derived from the evaporator 24a of the first trap tank 11a.

  After the pre-cooling time set in advance has passed and the temperature of the second trap tank 11b has sufficiently decreased, the first trap tank 11a is switched from the steam collecting process to the regeneration process, and the second trap tank 11b is moved from the regeneration process. Switch to the steam collection process. That is, the steam inlet valve 14Vb, the exhaust valve 15Vb, the high-pressure refrigerant valve 32Vb, and the compressor intake valve 35V related to the second trap tank 11b are opened, and the gas inlet valve 17Vb and the liquid introduction / derivation valve 16Vb are closed, respectively. State.

  Thus, as shown by the solid line in FIG. 5, in the refrigeration cycle 12, the refrigerant compressed by the compressor 21 is a high-temperature refrigerant path 31, the condenser 22, the high-pressure refrigerant valve 32Vb, and the high-pressure refrigerant path 32b including the heater 31a. , The expansion valve 23b, the low-temperature refrigerant introduction path 33b, the evaporator 24b of the second trap tank 11b, the gaseous refrigerant outlet path 34b, the compressor intake valve 35V, and the compressor intake path 35 circulate to the compressor 21. As a result, the solvent vapor is sucked into the second trap tank 11b decompressed via the exhaust passage 15b and cooled, solidified in the form of frost on the cooling surface, and collected in the second trap tank 11b.

  In the first trap tank 11a switched to the regeneration process, the steam inlet valve 14Va, the exhaust valve 15Va, the high-pressure refrigerant valve 32Va, and the gas inlet valve 17Va are closed, and the liquid introduction / derivation valve 16Va is opened to open the first trap tank 11a. The defrosting liquid is sucked up from the heating tank 13 and the solvent solidified material collected in the first trap tank 11a is heated and dissolved, and the gas inflow valve 17Va is opened to open the first trap tank 11a. The liquid discharging step of discharging the liquid from the liquid introduction / derivation path 16a to the heating tank 13 is performed.

  Next, the pre-cooling stage of the first trap tank 11a is entered, the liquid introduction / derivation valve 16Va, the gas inflow valve 17Va and the compressor suction valve 35V are closed, and the exhaust valve 15Va and the pre-cooling valve 36Va are opened, and the first trap tank 11a is opened. As shown by the solid line in FIG. 6, the low temperature refrigerant led out from the evaporator 24b of the second trap tank 11b to the gaseous refrigerant lead-out path 34b is transferred from the gaseous refrigerant lead-out path 34a to the first trap. The first trap tank 11a is pre-cooled by the low-temperature refrigerant which is caused to flow backward to the evaporator 24a of the tank 11a and derived from the evaporator 24b of the second trap tank 11b.

  When the regeneration process of the first trap tank 11a is completed, the first trap tank 11a is switched to the steam collecting process, and the second trap tank 11b is switched to the regeneration process. In this way, by alternately switching between the vapor collection process and the regeneration process in the first trap tank 11a and the second trap tank 11b, the solvent vapor collected in the vapor collection process can be recovered in the regeneration process. Since it can be removed, a large amount of vapor can be continuously collected over a long period of time.

  Moreover, since the frost (solidified solvent vapor) is directly heated and melted by the defrosting liquid heated by the high-temperature and high-pressure refrigerant flowing through the heater 31a, the hot gas for defrosting by introducing the high-temperature and high-pressure refrigerant into the cooler Compared with the method, frost can be reliably removed in a short time, and the switching time between the steam collecting step and the regeneration step can be shortened. Therefore, since it is possible to switch between the steam collecting process and the regeneration process in a short time, it becomes possible to use a small-capacity trap tank, and it is possible to reduce the size and cost of the entire apparatus.

  Furthermore, by providing the overflow path 19 in the heating tank 13, even if the amount of defrosting liquid in the heating tank 13 is increased by the liquid in which the frost is heated and dissolved, the excess liquid overflows in the liquid discharge stage. Since it can discharge | emit to an external collection container etc. from the path | route 19, a fixed amount of defrosting liquid can be hold | maintained in the heating tank 13, and the heating of the defrosting liquid by the high temperature / high pressure refrigerant | coolant which flows through the heater 31a is possible. Can be reliably performed in a certain time.

  Further, in the second operation method in which the solvent vapor is cooled and liquefied and collected in the trap tanks 11a and 11b, it is not necessary to heat and dissolve the solidified material with the defrosting liquid. What is necessary is just to start from the liquid discharge stage of the second stage when the heating and dissolving stage is omitted and the regeneration process is switched.

  That is, when performing the same steam collecting step of liquefying and collecting the solvent vapor in one trap tank, for example, the first trap tank 11a, in the second trap tank 11b, the steam inlet valve 14Vb, the exhaust gas The valve 15Vb and the high-pressure refrigerant valve 32Vb are closed, and the gas inflow valve 17Vb is opened in a state where the inflow of the solvent vapor into the second trap tank 11b and the cooling of the second trap tank 11b are stopped. By setting the same state as the liquid discharge stage, the liquid collected in the second trap tank 11b is discharged from the liquid introduction / derivation path 16b to the heating tank 13 by its own weight. The second trap tank 11b from which the liquid has been discharged is subjected to a pre-cooling stage next to the liquid discharge stage in the same manner as in the regeneration step in the first operation method described above, and the evacuation in the second trap tank 11b and the first trap Pre-cooling is performed with a low-temperature refrigerant derived from the evaporator 24a of the tank 11a.

  Thus, even when the solvent vapor is cooled and liquefied and collected, by alternately switching between the regeneration step and the vapor collection step in which the heating and dissolving step is omitted in the first trap tank 11a and the second trap tank 11b, A large amount of steam can be continuously collected over a long period of time.

  Further, since there is no need to heat the liquid in the heating tank 13, the bypass valve 38V is opened and the high-temperature and high-pressure refrigerant is diverted to the bypass path 38 without passing through the heater 31a. The heated liquid is no longer heated, and the generation of solvent vapor from the heating tank 13 can be prevented. Further, the drain valve 18 of the heating tank 13 is opened, and the liquid that has flowed down to the heating tank 13 in the liquid discharge stage can be recovered in another recovery container or the like without being stored in the heating tank 13. Can always be left empty.

  When the solvent vapor is water vapor, the defrosting liquid may be water, and the gas flowing into the trap tank at the liquid discharge stage may be air, but when the solvent vapor to be collected is a substance insoluble in water, When a liquid capable of dissolving substances is used as a defrosting liquid and the solvent vapor to be collected is a harmful organic solvent vapor, the defrosting liquid and the gas flowing into the trap tank are appropriately selected, and the overflow path It is preferable to employ a sealed structure so that the organic solvent vapor does not leak out of the apparatus from the gas inflow path.

  In addition, the configuration of the refrigeration cycle can adopt an optimal configuration as appropriate according to the refrigeration capacity. For example, in the refrigeration cycle 12 shown in this embodiment, a gaseous state derived from one of the evaporators 24a and 24b. Although the gaseous refrigerant lead-out paths 34a and 34b are used as the pre-cooling refrigerant introduction path for introducing the low-temperature refrigerant into the other of the evaporators 24a and 24b, a dedicated pre-cooling refrigerant introduction path may be provided. Can also be arranged at an appropriate position. Furthermore, three or more trap tanks can be provided and used for switching. For example, in the case of three tanks, when the first trap tank is performing the vapor collecting process, the second trap tank is heated and dissolved ( It is possible to set the third trap tank to perform the pre-cooling stage, only during solidification collection) and the liquid discharge stage.

  11a, 11b ... trap tank, 12 ... refrigeration cycle, 13 ... heating tank, 14a, 14b ... solvent vapor inflow path, 14Va, 14Vb ... steam inflow valve, 15a, 15b ... exhaust path, 15Va, 15Vb ... exhaust valve, 16a, 16b ... Liquid introduction / derivation path, 16Va, 16Vb ... Liquid introduction / derivation valve, 17a, 17b ... Gas inflow path, 17Va, 17Vb ... Gas inflow valve, 18 ... Drain valve, 19 ... Overflow path, 21 ... Compressor, 22 ... Condensation 23a, 23b ... expansion valve, 24a, 24b ... evaporator, 31 ... high temperature refrigerant path, 31a ... heater, 32a, 32b ... high pressure refrigerant path, 32Va, 32Vb ... high pressure refrigerant valve, 33a, 33b ... low temperature refrigerant introduction Route, 34a, 34b ... Gaseous refrigerant lead-out route, 35 ... Compressor intake route, 35V ... Compressor intake valve, 36a, 36b ... Pre-cooling Medium derived route, 36Va, 36Vb ... pre-cooling valve, 37a, 37b ... the pre-cooling refrigerant circulation path, 38 ... bypass route, 38V ... bypass valve

Claims (6)

Compressor, a condenser, introducing solvent vapor into the expansion valve and the trap tank being cooled by cold refrigerant flowing through the evaporator of the refrigeration cycle having an evaporator, capturing and cooling the solvent vapor in the trap tank The cooling trap device to be collected includes a plurality of trap tanks and a liquid storage tank for storing a liquid containing a defrosting liquid, and the plurality of trap tanks have a solvent vapor inflow for allowing the solvent vapor to flow into the trap tank. A path, a steam inlet valve provided in the solvent vapor inlet path, an exhaust path for evacuating the inside of the trap tank, an exhaust valve provided in the exhaust path, and the bottom of the trap tank and the liquid storage tank are connected to each other A liquid introduction / extraction path, a liquid introduction / extraction valve provided in the liquid introduction / extraction path, a gas inflow path for allowing gas to flow into the trap tank, and a gas inflow valve provided in the gas inflow path; Comprising respectively, the freezing cycle, the high-temperature refrigerant path by a high-temperature high-pressure refrigerant compressed by the compressor with a heater for heating the liquid for defrosting of the liquid storage tank, the high-temperature high-pressure refrigerant which has flowed through the high-temperature refrigerant passage And a plurality of high-pressure refrigerant paths for introducing the high-pressure refrigerant condensed in the condenser into the plurality of evaporators provided in each trap tank, and the high-pressure refrigerant paths, respectively. A high-pressure refrigerant valve, an expansion valve that expands the high-pressure refrigerant that has passed through each high-pressure refrigerant valve, a low-temperature refrigerant introduction path that introduces the low-temperature refrigerant expanded by each expansion valve into each evaporator, and a gas that has evaporated in each evaporator gaseous refrigerant outlet path for deriving respective refrigerant from the evaporator, the refrigerant introduction path for pre-cooling to introduce a gaseous refrigerant derived gaseous refrigerant outlet passage to another evaporator from one evaporator, Serial and compressor suction path gaseous refrigerant derived gaseous refrigerant outlet path through the compressor intake valve circulates sucked into the compressor, is introduced from the refrigerant introduction path for the pre-cooling to the other evaporator and a pre-cooling refrigerant circulating path for circulating the suction precooling refrigerant derived the other evaporator to the compressor via a pre-cooling valve, in one trap tank of the plurality of trap tank, said one trap vessel The steam inlet valve, the exhaust valve, the high-pressure refrigerant valve and the compressor intake valve are opened to close the gas inlet valve and the liquid inlet / outlet valve, and a low-temperature refrigerant is introduced into the evaporator of the one trap tank. While performing a vapor collection step of cooling and solidifying the solvent vapor flowing from the solvent vapor inflow path into one trap tank by cooling one trap tank, The other tiger Open the liquid inlet / outlet valve with the steam inlet valve, exhaust valve, high pressure refrigerant valve and gas inlet valve of the tank closed, and suck the defrosting liquid heated with the high temperature / high pressure refrigerant from the liquid storage tank. The frost adhering to the cooling surface of the other trap tank is heated and dissolved by the defrosting liquid to liquefy it, and the gas inlet valve is opened to introduce gas into the other trap tank. A liquid discharging stage for returning the defrosting liquid including the dissolved and liquefied liquid to the liquid storage tank, the liquid introduction / derivation valve and the gas inflow valve are closed, the exhaust valve and the precooling valve are opened, and the vapor collecting process is performed. Including a pre-cooling stage in which a gaseous refrigerant derived from an evaporator of one trap tank is introduced into an evaporator of another trap tank, and the gaseous refrigerant having passed through the evaporator of the other trap tank is sucked into a compressor. Performing the process, the steam collector in a plurality of trap tanks Cold trap apparatus which comprises carrying out switching between regeneration steps and. The high-temperature refrigerant path includes a bypass path that bypasses the heater and a bypass valve provided in the bypass path in parallel with the heater, and a steam inlet valve, an exhaust valve, and a high-pressure refrigerant of the one trap tank By opening the valve and the compressor intake valve and closing the gas inflow valve and the liquid introduction / delivery valve, respectively, by introducing a low-temperature refrigerant into the evaporator of the one trap tank and cooling the one trap tank, When the vapor trapping step for collecting and collecting the solvent vapor flowing from the solvent vapor inflow path into the one trap tank is cooled and liquefied in the one trap tank, the bypass valve is opened and the heating is performed. The high-temperature and high-pressure refrigerant that bypasses the condenser flows to the condenser via the bypass path, and in the other trap tank, the steam inlet valve, the exhaust valve, and the high-pressure refrigerant valve of the other trap tank are closed. A liquid discharge stage for opening the gas inflow valve and the liquid introduction / derivation valve, introducing the gas into the other trap tank and discharging the liquid collected in the other trap tank to the liquid storage tank, and the liquid introduction Close the outlet valve and the gas inlet valve, open the exhaust valve and the precooling valve, introduce the gaseous refrigerant derived from the evaporator of one trap tank that is performing the vapor collection process into the evaporator of the other trap tank, 2. The cooling trap device according to claim 1 , wherein a regeneration step including a pre-cooling step of sucking the gaseous refrigerant having passed through the evaporator of the other trap tank into the compressor is performed . In the case where the plurality of trap tanks are three tanks, the second trap tank performs the heating and dissolving stage and the liquid discharging stage when the first trap tank is performing the vapor collecting step, and the third trap tank The cooling trap device according to claim 1 or 2, wherein the precooling step is performed . A solvent vapor is introduced into a trap tank cooled by a low-temperature refrigerant flowing through the evaporator of a refrigeration cycle including a compressor, a condenser, an expansion valve, and an evaporator, and the solvent vapor is cooled and trapped in the trap tank. The cooling trap device to be collected includes a plurality of trap tanks and a liquid storage tank for storing a liquid containing a defrosting liquid, and the plurality of trap tanks have a solvent vapor inflow for allowing the solvent vapor to flow into the trap tank. A path, a steam inlet valve provided in the solvent vapor inlet path, an exhaust path for evacuating the inside of the trap tank, an exhaust valve provided in the exhaust path, and the bottom of the trap tank and the liquid storage tank are connected to each other A liquid introduction / extraction path, a liquid introduction / extraction valve provided in the liquid introduction / extraction path, a gas inflow path for allowing gas to flow into the trap tank, and a gas inflow valve provided in the gas inflow path; Each of the refrigeration cycles includes a high-temperature refrigerant path that discharges a high-temperature and high-pressure refrigerant compressed by the compressor, the condenser that condenses the high-temperature and high-pressure refrigerant that has passed through the high-temperature refrigerant path, and the high-pressure refrigerant that is condensed in the condenser. Are introduced into a plurality of evaporators provided in each trap tank, a plurality of high-pressure refrigerant paths, high-pressure refrigerant valves provided in the respective high-pressure refrigerant paths, and high-pressure refrigerant via each high-pressure refrigerant valve are expanded. An expansion valve, a low-temperature refrigerant introduction path for introducing the low-temperature refrigerant expanded by each expansion valve to each evaporator, a gaseous refrigerant deriving path for deriving the gaseous refrigerant evaporated by each evaporator from each evaporator, A precooling refrigerant introduction path for introducing the gaseous refrigerant derived from one evaporator to the gaseous refrigerant extraction path to another evaporator, and a compression of the gaseous refrigerant derived to the gaseous refrigerant extraction path A pre-cooling refrigerant introduced into the other evaporator from the pre-cooling refrigerant introduction path through the pre-cooling refrigerant introduction path through the pre-cooling valve through the pre-cooling valve. A pre-cooling refrigerant circulation path that circulates and sucks into the compressor , and in one trap tank, a steam inlet valve, an exhaust valve, a high-pressure refrigerant valve, and a compressor suction valve of the one trap tank Open the gas inlet valve and the liquid inlet / outlet valve and close the trap tank by introducing a low-temperature refrigerant into the evaporator of the trap tank and cooling the trap tank. In the other trap tank, the vapor inlet valve, the exhaust valve, and the high-pressure refrigerant of the other trap tank are used during the vapor trapping process for cooling and collecting the solvent vapor flowing into the solvent vapor inflow path. Valve closed A liquid discharge stage for opening the gas inflow valve and the liquid introduction / derivation valve in the state, introducing the gas into the other trap tank, and discharging the liquid collected in the other trap tank to the liquid storage tank ; Close the inlet / outlet valve and the gas inflow valve, open the exhaust valve and the precooling valve, and introduce the gaseous refrigerant derived from the evaporator of one trap tank performing the vapor collection process into the evaporator of the other trap tank. A regeneration step including a precooling step of sucking the gaseous refrigerant having passed through the evaporator of the other trap tank into the compressor, and switching between the vapor collecting step and the regeneration step in a plurality of trap tanks. A cooling trap device. In the case where the plurality of trap tanks are three tanks, when the first trap tank is performing the vapor collecting process, the second trap tank performs the liquid discharge stage, and the third trap tank performs the pre-cooling stage. cooling trap apparatus according to claim 4, characterized in that. The liquid storage tank includes an overflow path 19 that overflows the liquid in the liquid storage tank and discharges it from the liquid storage tank when the liquid level of the liquid in the liquid storage tank exceeds a preset height. The cooling trap device according to any one of claims 1 to 5, wherein the cooling trap device is provided .

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