A cooling circulation device for gas chromatographic determination of N,N-dimethylformamide in water

Abstract

This utility model discloses a cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water, belonging to the technical field of N,N-dimethylformamide determination in water. This cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water includes a cooling mechanism and a placement mechanism. The cooling mechanism includes a cooling box, with an evaporator fixedly installed at the upper end inside the cooling box. A heat-conducting pipe is embedded at the upper end of the evaporator, and the heat-conducting pipe is arranged in a spiral pattern. The placement mechanism includes a placement box, with its bottom end connected to the top end of the cooling box. A pump is fixedly installed on one side of the bottom end inside the placement box, and the output end of the pump is connected to one end of the heat-conducting pipe. The other end of the heat-conducting pipe extends through the placement box into its interior. A placement rack is installed at the upper end inside the placement box, and several placement slots are embedded in the rack. This utility model can effectively improve the efficiency of gas chromatography determination of N,N-dimethylformamide in water.

Description

Technical Field

[0001] This utility model relates to the field of N,N-dimethylformamide determination technology in water, specifically a cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water. Background Technology

[0002] N,N-Dimethylformamide is an organic compound with the chemical formula C3H7NO, and is a colorless, transparent liquid. It is both a widely used chemical raw material and a versatile and excellent solvent. It is miscible with water and most organic solvents, and has good solubility for a variety of organic and inorganic compounds. Based on the above, the inventors have discovered the following problem: Currently, when performing gas chromatography determination of N,N-dimethylformamide in water, the most common method when the sample temperature is too high is natural cooling, waiting until it cools to a temperature suitable for gas chromatography before detection. However, natural cooling relies on slow heat exchange between the sample and the environment, resulting in an extremely slow cooling rate. For environmental monitoring stations or chemical enterprise laboratories undertaking a large number of testing tasks, the cooling process alone consumes a significant amount of time, severely affecting the timeliness of test reports and hindering timely data support for environmental assessments and product quality control.

[0003] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water, in order to achieve a more practical purpose. Utility Model Content

[0004] The purpose of this invention is to provide a cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water, so as to solve the problem mentioned in the background art that the natural cooling efficiency is low when the sample temperature is too high during the gas chromatography determination of N,N-dimethylformamide in water.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water includes a cooling mechanism and a placement mechanism. The cooling mechanism includes a cooling box, an evaporator fixedly installed at the upper end of the cooling box, and a heat-conducting pipe embedded at the upper end of the evaporator, the heat-conducting pipe being distributed in a spiral pattern. The placement mechanism includes a placement box, the bottom end of which is connected to the top end of the cooling box. A pump is fixedly installed on one side of the bottom end of the placement box, the output end of which is connected to one end of the heat-conducting pipe, the other end of which extends through the placement box into the interior. A placement rack is installed at the upper end of the interior of the placement box, and several placement slots are embedded in the placement rack.

[0007] Furthermore, a condenser is inserted into one side of the interior of the cooling box, and one side of the condenser extends through the cooling box to the outside, and several fans are embedded therein.

[0008] The beneficial effect of adopting the above-mentioned further solution is that the condenser, together with the fan, cools and liquefies the high-temperature gaseous refrigerant discharged from the compressor, releases heat, maintains the continuous operation of the refrigeration cycle, and ensures the stability of the low-temperature environment of the evaporator.

[0009] Furthermore, a compressor is fixedly installed at one end of the interior of the cooling box. The input end of the compressor is connected to the output end of the evaporator through a pipe, and the output end of the compressor is connected to the input end of the condenser through a pipe.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the compressor compresses the low-temperature, low-pressure gaseous refrigerant generated by the evaporator into a high-temperature, high-pressure gas, providing power for the refrigeration cycle, and transferring heat through the condenser to ensure the refrigeration efficiency of the cooling mechanism.

[0011] Furthermore, a dryer filter is fixedly installed at the other end of the interior of the cooling box, and the input end of the dryer filter is connected to the output end of the condenser through a pipe.

[0012] The beneficial effects of adopting the above-mentioned further solutions are that the dryer filter removes moisture and impurities from the refrigerant, prevents blockage or ice blockage in the refrigeration system pipelines, extends the service life of the equipment, and ensures the stability and reliability of the refrigeration cycle.

[0013] Furthermore, an expansion valve is fitted at the output end of the dryer filter, and the other end of the expansion valve is connected to the input end of the evaporator through a pipe.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the expansion valve throttles and reduces the pressure of the high-pressure liquid refrigerant output from the dryer filter, making it a low-temperature and low-pressure liquid, which facilitates evaporation and heat absorption in the evaporator, thereby achieving precise control of the cooling effect.

[0015] Furthermore, a water inlet pipe is installed on the bottom side of the placement box, and a box door is hinged to the upper side of the placement box via a pair of hinges.

[0016] The advantages of adopting the above-mentioned further solution are that the water inlet pipe is used to inject coolant into the interior of the placement box, and in conjunction with the circulation of the heat conduction pipe, the coolant can better remove the temperature of the water sample in the sample tube, and the box door can easily seal the placement box.

[0017] Furthermore, infrared temperature sensors are embedded in the bottom of the cabinet door above each of the aforementioned placement slots.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the infrared temperature sensor monitors the water sample temperature in the sampling tube clamped in the placement tank in real time, and the data is fed back to the touch panel, which makes it convenient for the operator to adjust the cooling parameters in real time. When the internal temperature of one of the sampling tubes is cooled to a suitable temperature, the user can take it out for testing.

[0019] Furthermore, the inner wall of the placement groove is provided with several cavities, and a pressing block is slidably installed on one side of each cavity. A spring is fixedly installed on one side of each cavity, and one end of the spring is connected to one end of the pressing block.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the spring pushes the squeezing block to clamp the water sample test tube, preventing the test tube from shaking or tipping over during the cooling process; the elastic structure also provides cushioning to prevent the test tube from being damaged due to squeezing.

[0021] Furthermore, a touch panel is fixedly installed on the bottom side of the cooling box.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the touch panel integrates device control and status display functions, improving the ease of operation and efficiency.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: This cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water uses a cooling mechanism that cools the sample tubes inserted in the placement slot within the placement box through heat exchange between the evaporator and the heat-conducting pipe. A pump drives the circulation of coolant within the heat-conducting pipe, and the spiral-shaped heat-conducting pipe increases the heat dissipation area, improving cooling efficiency. The placement rack and placement slot allow for the orderly placement of water sample tubes and fix the sample tubes, facilitating pretreatment cooling before gas chromatography determination. The compressor compresses the low-temperature, low-pressure gaseous refrigerant generated by the evaporator into a high-temperature, high-pressure gas, providing power for the refrigeration cycle. Heat transfer is achieved through the condenser, ensuring the cooling efficiency of the cooling mechanism. The water inlet pipe injects coolant into the interior of the placement box, which, in conjunction with the circulation of the heat-conducting pipe, allows the coolant to better remove the temperature of the water sample inside the sample tube. A spring pushes the squeezing block to clamp the water sample tube, preventing the tube from shaking or tipping over during cooling. The elastic structure also provides cushioning to prevent the tube from breaking due to squeezing. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a three-dimensional structural diagram of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a three-dimensional structural diagram of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the cooling box of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 1 ;

[0028] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the cooling box of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 2 ;

[0029] Figure 6 This is a top cross-sectional view of the placement tank of the cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the internal three-dimensional structure of the cooling box for gas chromatography determination of N,N-dimethylformamide in water disclosed in this embodiment of the present invention. Figure 3 .

[0031] In the diagram: 1. Cooling mechanism; 101. Cooling box; 102. Evaporator; 103. Dryer filter; 104. Compressor; 105. Condenser; 106. Fan; 107. Heat pipe; 108. Expansion valve; 2. Placement mechanism; 201. Placement box; 202. Placement rack; 203. Placement slot; 204. Box door; 205. Infrared temperature sensor; 206. Water inlet pipe; 207. Pump; 208. Cavity; 209. Spring; 210. Extrusion block; 3. Touch panel. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-7This utility model provides a technical solution: a cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water, comprising a cooling mechanism 1 and a placement mechanism 2. The cooling mechanism 1 includes a cooling box 101, with an evaporator 102 fixedly installed at the upper end of the cooling box 101. A heat-conducting pipe 107 is embedded at the upper end of the evaporator 102, and the heat-conducting pipe 107 is arranged in a spiral pattern. The placement mechanism 2 includes a placement box 201, with the bottom end of the placement box 201 connected to the top end of the cooling box 101. A pump 207 is fixedly installed on one side of the bottom end of the placement box 201, and the output end of the pump 207 is connected to one end of the heat-conducting pipe 107. The other end of the heat pipe 107 extends through the placement box 201 into the interior. A placement rack 202 is installed at the upper end of the interior of the placement box 201. Several placement slots 203 are embedded in the placement rack 202. The cooling mechanism 1 cools the sample tubes inserted in the placement slots 203 in the placement box 201 by exchanging heat between the evaporator 102 and the heat pipe 107. The pump 207 drives the coolant in the heat pipe 107 to circulate. The spiral heat pipe 107 increases the heat dissipation area and improves the cooling efficiency. The placement rack 202 and the placement slots 203 realize the orderly placement of water sample tubes and fix the sample tubes, which is convenient for pretreatment cooling before gas chromatography determination.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1-7A condenser 105 is inserted into one side of the interior of the cooling box 101. One side of the condenser 105 extends through the cooling box 101 to the outside and is fitted with several fans 106. A compressor 104 is fixedly installed at one end of the interior of the cooling box 101. The input end of the compressor 104 is connected to the output end of the evaporator 102 via a pipe, and the output end of the compressor 104 is connected to the input end of the condenser 105 via a pipe. A dryer filter 103 is fixedly installed at the other end of the interior of the cooling box 101. The input end of the dryer filter 103 is connected to the output end of the condenser 105 via a pipe, and an expansion valve 108 is fitted onto the output end of the dryer filter 103. The other end of the expansion valve 108 is connected to the input end of the evaporator 102 via a pipe. The condenser 105, in conjunction with the fans 106, [processes / dissipates / contains / etc.]. The high-temperature gaseous refrigerant discharged by the compressor 104 is cooled and liquefied, releasing heat to maintain the continuous operation of the refrigeration cycle and ensure the stability of the low-temperature environment of the evaporator 102. The compressor 104 compresses the low-temperature, low-pressure gaseous refrigerant generated by the evaporator 102 into a high-temperature, high-pressure gas, providing power for the refrigeration cycle. Heat transfer is achieved through the condenser 105, ensuring the refrigeration efficiency of the cooling mechanism 1. The dryer filter 103 removes moisture and impurities from the refrigerant, preventing blockage or ice blockage in the refrigeration system pipeline, extending the service life of the equipment, and ensuring the stability and reliability of the refrigeration cycle. The expansion valve 108 throttles and reduces the pressure of the high-pressure liquid refrigerant output from the dryer filter 103, making it a low-temperature, low-pressure liquid, which is convenient for evaporation and heat absorption in the evaporator 102, achieving precise control of the refrigeration effect.

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figures 1-7A water inlet pipe 206 is installed on the bottom side of the placement box 201. A door 204 is hinged to the upper side of the placement box 201 via a pair of hinges. Infrared temperature sensors 205 are embedded in the bottom of the door 204 above several placement slots 203. Several cavities 208 are formed in the inner side wall of the placement slots 203. A pressing block 210 is slidably installed on one side of each cavity 208. A spring 209 is fixedly installed on one side of each cavity 208. One end of the spring 209 is connected to one end of the pressing block 210. A touch panel 3 is fixedly installed on the bottom side of the cooling box 101. The water inlet pipe 206 is used to inject coolant into the interior of the placement box 201 to cooperate with the circulation of the heat pipe 107. This design allows the coolant to better remove the temperature of the water sample inside the sample tube. The door 204 facilitates the sealing of the placement box 201. The infrared temperature sensor 205 monitors the temperature of the water sample in the clamped sampling tube inside the placement slot 203 in real time, and the data is fed back to the touch panel 3, allowing the operator to adjust the cooling parameters in real time. When the internal temperature of one of the sampling tubes cools to a suitable temperature, the user can take it out for testing. The spring 209 pushes the squeezing block 210 to clamp the water sample test tube, preventing the test tube from shaking or tipping over during the cooling process. The elastic structure also provides cushioning to prevent the test tube from being damaged due to squeezing. The touch panel 3 integrates equipment control and status display functions, improving the convenience and efficiency of operation.

[0038] Specifically, the working principle of this cooling circulation device for the gas chromatography determination of N,N-dimethylformamide in water is as follows: During use, the operator inserts the water sample tube into the placement tank 203. Spring 209 pushes the squeezing block 210 to elastically clamp the tube, preventing shaking. Coolant is injected into the placement box 201 through the inlet pipe 206, allowing the water sample tube to be inserted into the coolant. After the pump 207 starts, it drives the coolant in the placement box 201 into the heat transfer pipe 107. As the coolant flows through the evaporator 102 via the spiral pipe, it is cooled through heat exchange. The low-temperature coolant then flows back to the placement box 201, continuously absorbing heat from the water sample in the tube, thus achieving cooling. Inside the unit 1, the compressor 104 compresses the low-temperature, low-pressure gaseous refrigerant generated by the evaporator 102 into a high-temperature, high-pressure gas. The gas is then cooled and liquefied by the condenser 105 and the fan 106. After passing through the dryer filter 103 to remove moisture and impurities, the gas is finally throttled and depressurized by the expansion valve 108 to a low-temperature, low-pressure liquid state and re-enters the evaporator 102 to complete the refrigeration cycle. The infrared temperature sensor 205 on the door 204 monitors the water sample temperature in the water sample tube in real time and transmits the data to the touch panel 3. The operator can adjust the flow rate of the pump 207 or the power of the compressor 104 according to the set threshold. When the temperature of a certain test tube reaches the standard, it can be removed for testing, while the remaining test tubes continue to cool.

[0039] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. A cooling circulation device for the gas chromatographic determination of N,N-dimethylformamide in water, characterized in that, The device includes a cooling mechanism (1) and a placement mechanism (2). The cooling mechanism (1) includes a cooling box (101). An evaporator (102) is fixedly installed at the upper end of the cooling box (101). A heat-conducting pipe (107) is embedded at the upper end of the evaporator (102). The heat-conducting pipe (107) is distributed in a spiral shape. The placement mechanism (2) includes a placement box (201). The bottom end of the placement box (201) is connected to the top end of the cooling box (101). A pump (207) is fixedly installed on one side of the bottom end of the placement box (201). The output end of the pump (207) is connected to one end of the heat-conducting pipe (107). The other end of the heat-conducting pipe (107) extends through the placement box (201) into the interior. A placement rack (202) is installed at the upper end of the interior of the placement box (201). Several placement slots (203) are embedded in the placement rack (202).

2. The cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, A condenser (105) is inserted into one side of the interior of the cooling box (101). One side of the condenser (105) extends through the cooling box (101) to the outside and is fitted with several fans (106).

3. The cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 2, characterized in that, A compressor (104) is fixedly installed at one end of the interior of the cooling box (101). The input end of the compressor (104) is connected to the output end of the evaporator (102) through a pipe, and the output end of the compressor (104) is connected to the input end of the condenser (105) through a pipe.

4. The cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 3, characterized in that, A dryer filter (103) is fixedly installed at the other end of the interior of the cooling box (101), and the input end of the dryer filter (103) is connected to the output end of the condenser (105) through a pipe.

5. A cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 4, characterized in that, An expansion valve (108) is fitted at the output end of the dryer filter (103), and the other end of the expansion valve (108) is connected to the input end of the evaporator (102) through a pipe.

6. The cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, A water inlet pipe (206) is installed on the bottom side of the placement box (201), and a box door (204) is hinged to the upper side of the placement box (201) by a pair of hinges.

7. A cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 6, characterized in that, Infrared temperature sensors (205) are embedded in the bottom of the box door (204) above several of the placement slots (203).

8. The cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, The inner wall of the placement groove (203) is provided with a plurality of cavities (208). A pressing block (210) is slidably installed on one side of each cavity (208). A spring (209) is fixedly installed on one side of each cavity (208). One end of the spring (209) is connected to one end of the pressing block (210).

9. A cooling circulation device for gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, A touch panel (3) is fixedly installed on the bottom side of the cooling box (101).

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