RU184258U1 - Chromatograph Thermostat Cooling Device - Google Patents

Abstract

The utility model relates to analytical instrumentation, to devices for cooling the thermostat of a chromatograph. The chromatograph thermostat cooling device comprises a housing in which an antifreeze container is arranged for circulating antifreeze through the chromatograph thermostat heat exchanger by means of a circulation pump with a check valve installed on the antifreeze supply channel, to which, after the circulation pump, the air supply channel is connected with an air supply compressor and with a controllable valve and a non-return valve sequentially placed on it. Technical is the expansion of the arsenal of technical means, improving the safety of the device, increasing the efficiency of the device, expanding operational characteristics and functionality. 1 ill.

Description

The utility model relates to analytical instrumentation, in particular, to devices for cooling the chromatograph thermostat.

The following solutions are known in the art.

So from the description of the patent of the Russian Federation No. 2529665 (published September 27, 2014), the thermostat of the columns of the chromatograph is known, which contains a door and elements for cooling.

For the closest analogue to the patented decision, the design of a liquid-cooled device was adopted, which contains a heat exchanger, a pump for supplying refrigerant, a valve (see RF patent No. 2607201, published January 10, 2017).

The disadvantages of the analogue are the bulkiness and inconvenience of service due to the design of the device, the low reliability of the device.

The technical problem to which the claimed utility model is aimed is to eliminate these drawbacks, expand the arsenal of technical means, increase the safety of the device, increase the efficiency of the device, expand operational characteristics and functionality.

The technical result of the patented solution is to increase the reliability and safety of the device.

The technical result is achieved through the use of a chromatograph thermostat cooling device containing a housing in which an antifreeze container is arranged, which is capable of circulating antifreeze through a chromatograph thermostat heat exchanger by means of a circulation pump with a check valve installed on the antifreeze supply channel to which the channel is connected after the circulation pump air supply, made with the possibility of connection with the air supply compressor and with sequentially placed and it controlled valve and check valve.

The use of a tank for antifreeze and a circulation pump allows the antifreeze to be supplied to the heat exchanger, and the presence of a controlled valve on the air supply channel helps to remove antifreeze from the heat exchanger with compressed air at the end of work, which together contributes to reliable and safe operation of the chromatograph thermostat cooling device (cooling device), also improves the efficiency of the device.

Thanks to the presence of one non-return valve on the air supply channel, the risk of getting antifreeze into the compressor is eliminated, and the other non-return valve on the antifreeze channel - air entering the circulation pump, which increases the safety of the device, which in turn increases the reliability and efficiency of the device.

Next, the solution is illustrated by reference to the figure, which depicts the following.

In FIG. 1 is a diagram of a cooling device with a chromatograph thermostat.

According to the figure, the cooling device comprises a housing 1 with exhaust and inlet openings 15.16 for the possibility of connecting to the heat exchanger 2, and an air supply opening 17 with the possibility of connecting to the compressor 3, an insulated container 4 with antifreeze pre-cooled to negative temperatures, which can non-combustible ethylene glycol should be used. To supply antifreeze from the tank 4 to the heat exchanger 2, an antifreeze supply channel 5 is used, which passes through the outlet 15, and on which, between the tank 4 and the outlet 15, is installed a circulation pump 6 with a check valve 7, while as a circulation pump 6 a gear pump can be used to increase the reliability of the device. To remove antifreeze from the heat exchanger 2 back to the tank 4, an antifreeze supply channel 14 is used, which passes through the inlet 16 in the housing 1. To supply air from the compressor 3 to the cooling device, an air supply channel 8 is used which passes through the air supply hole 17 and interfaced with the antifreeze supply channel 5 after the circulation pump 6. Also, on the air supply channel 8, a controlled valve 9 and a non-return valve 10 are installed sequentially after the air supply opening 17. The heat exchanger 2 is a curved copper pipe on which to increase the efficiency of heat exchange plates are fixed by soldering round shape (plate heat exchanger). The heat exchanger 2 is attached to the door of the thermostat of the chromatograph 11 from the inside over the thermally insulating material through fluoroplastic sleeves. Antifreeze 5.14 and air supply channels 8 are thermally insulated flexible hoses. After the cooling process is completed, compressed air from the compressor 3 is used to remove antifreeze from the heat exchanger 2, which enters the air supply channel 8 through the controlled valve 9. One check valve 10 is installed on the air supply channel 8 and prevents the antifreeze from entering the compressor 3 when the circulation pump 6 Another check valve 7 is installed on the air supply channel 5 after the circulation pump 6, which reduces the risk of air entering the circulation pump 6 when removing antifreeze from the heat exchanger 2. Also, a power supply and an electronic control board are installed inside the device for stable and reliable operation of the cooling device. In the tank for antifreeze 4 can also be installed level sensor 12 and temperature 13 to monitor the parameters of antifreeze.

To cool the ethylene glycol vapors and cool the hoses at the points of contact with the heat exchanger 2 installed on the door of the thermostat of the chromatograph 11, an external heat exchanger and two hoses are installed to connect an external heat exchanger to the additional pump (not shown in Fig.). An additional pump allows you to condense the coolant vapors and protect the hoses from overheating at the points of their attachment to the chromatograph. When the working area of the chromatograph is heated, the remaining 2 drops of ethylene glycol remaining in the heat exchanger will turn into steam, which will be discharged through the drain hose into the atmosphere, which is undesirable. To capture and condense ethylene glycol vapors, an external pipe-in-pipe heat exchanger is installed on the inlet and outlet pipes of ethylene glycol. An additional pump constantly supplies coolant to the jacket of the outdoor heat exchanger. In the case of an industrial cryostat, a standard pump is used, which constantly pumps the cooled ethylene glycol, while cooling the vapors leaving the heat exchanger 2 inside the working area. The condensed liquid is discharged into the bath (or other container) of the cryostat, after which it is cooled and again enters the cooling cycle.

The cooling device operates as follows.

After turning on the circulation pump 6, the cooled antifreeze from the insulated tank 4 through the antifreeze supply channel 5 enters the heat exchanger 2 and circulates in it, cooling the thermostat of the chromatograph. After completion of work, compressed air is used to remove antifreeze from the heat exchanger 2, which enters from compressor 3 through the controlled valve 9 through the air supply channel 8. The non-return valve 7 prevents air from entering the circulation pump 6, and the non-return valve 10 prevents the antifreeze from entering the compressor 3. Next, the antifreeze through the feed channel of the antifreeze 14 enters the tank 4. After completion of work, the cycle repeats.

Options for using antifreeze may be as follows:

antifreeze is cooled to the required negative temperatures in any refrigeration device (refrigerator, freezer chest), after which it is transferred to a heat-insulated container and used to cool the thermostat (single measurements),

antifreeze is continuously cooled in the freezer, from where it enters the chromatograph with a pump (periodic operation),

Antifreeze is continuously cooled in a laboratory cryostat, from where it enters the chromatograph (continuous operation).

The cooling device is very simple to manufacture, in the production of used plumbing parts (valves, adapters), produced in bulk. There are no high pressures, which dramatically increases its reliability and safety at a temperature difference in the chromatograph (from -4 to +280 degrees C).

The cooling device can be installed on any chromatograph. To do this, it is enough to replace the standard thermostat door with a modified one (for this, two holes are drilled in the door and a heat exchanger is installed).

Thanks to the combination of all structural solutions, high reliability, efficiency and safety of the device are achieved.

Claims (1)

A chromatograph thermostat cooling device, characterized in that it contains a housing in which an antifreeze container is arranged, capable of circulating antifreeze through a chromatograph thermostat heat exchanger by means of a circulation pump with a check valve installed on the antifreeze supply channel to which, after the circulation pump, an air supply channel is connected made with the possibility of connection with an air supply compressor and with a controllable valve sequentially placed on it and tn valve.

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