CN206601283U - A kind of closed nitrogen blows automatics - Google Patents

Abstract

The utility model discloses a closed nitrogen blowing automatic device, which comprises a control area, an operation box and a metal bath. The control area includes an air inlet, a semiconductor heating strip, an air spring and a control panel. The control panel includes a switch, a liquid crystal display, a nitrogen temperature display, a temperature display, a gas flow meter, and flow adjustment buttons. The operation box includes air distribution system, operation door, handle and sealing magnetic strip. The gas distribution system includes vent pipes, rubber hoses, gas flow meter probes, nitrogen blowing needles, sliding racks, gears, and sliders. The metal bath includes a sample placement groove, a slide rail, and a temperature-insulating rubber strip. The sample tube is placed on the sample storage tank, and the metal bath heats the sample. The control panel can set the nitrogen temperature, nitrogen blowing time, metal bath temperature and storage temperature. The utility model has two types of sample placement tanks, which can heat nitrogen and store samples for a long time. The automatic device can improve the operation efficiency, shorten the sample concentration time, and reduce the experimental error.

Description

A closed nitrogen blowing automatic device

technical field

The utility model belongs to the field of sample concentration devices in liquid phase, gas phase and mass spectrometry analysis, in particular to a nitrogen purging instrument.

Background technique

Sample concentration is a problem involved in many chemical laboratories, which can be concentrated by rotary evaporator or freeze dryer. The rotary evaporator can quickly distill various samples, especially for those inexperienced operators. The disadvantage is that the loss is large, it is easy to bump, and it cannot concentrate a small amount of samples. The freeze dryer can maintain the rehydration of the freeze-dried sample, and can maintain the integrity of the sample to the greatest extent, and the structural organization is not damaged. The disadvantage is that the organic solvent cannot be concentrated, and corrosive solvents such as strong acid and strong alkali are easy to damage the equipment. In this case, nitrogen blowing instrument came into being, which can solve the shortcomings of rotary evaporator and freeze dryer.

Nitrogen is an inert gas that can isolate oxygen and prevent oxidation of samples. The nitrogen blowing instrument is suitable for the concentration of a small number of samples. It blows nitrogen to the surface of the heated sample quickly, continuously and controllably to realize the rapid concentration of a large number of samples. It has the characteristics of time saving, convenient operation and easy control. It can quickly The expected results are obtained, therefore, the nitrogen blowing instrument is widely used in pesticide residue analysis, commodity inspection, food, environment, pharmaceuticals, biological products and other industries.

The existing nitrogen blowing instrument consists of three parts: a heating device, a sample positioning device and a gas supply device. Nitrogen is blown into the sample container fixed on the sample positioning device and placed in the heating device through the blowing pipe of the gas supply device, so that the organic solvent in the sample in the sample container is quickly volatilized, thereby realizing the concentration of the sample. There are also following deficiencies in the present nitrogen blowing instrument:

1. The nitrogen blowing efficiency of the existing nitrogen blowing device is low, only 8-10 samples can be blown at a time, and there is only one type of heating device. After a nitrogen blow, it is necessary to manually adjust the equipment to add samples, which will easily lead to large errors in the same batch of samples, and even affect the test results. At the same time, the automation of nitrogen blowing for multiple samples cannot be realized, and the samples cannot be stored for a long time after nitrogen blowing.

2. For the heating device, the existing instrument either does not have a pre-heating system or a heating device is installed separately. If there is no pre-heating system, the consumption of room temperature gas is relatively large during the experiment, which may take a long time and the test efficiency is relatively low. Existing instruments do not have a device for heating nitrogen, and hot nitrogen can improve nitrogen blowing efficiency.

Utility model content

The purpose of this utility model is to provide a novel automatic nitrogen blowing instrument in order to solve the above problems.

A nitrogen blowing device comprises a control area, an operation box and a metal bath, the upper part of the operation box is connected with the control area, and the lower part is connected with the metal bath. The control area controls the operation box and metal bath through the control panel. The control area includes air inlet, semiconductor heating block, air spring and control panel. The air inlet is connected to the back of the control area. The semiconductor heating block is installed at the air inlet. The air spring is located directly above the control area. directly in front of the control area. The control panel includes a switch, a liquid crystal display, a temperature display, a nitrogen temperature display, a gas flow meter, and flow adjustment buttons. The operation box includes a gas distribution system, an operation door, a handle, and a sealing magnetic strip. The handle is connected to the left side of the operation door, the sealing magnetic strip is installed around the operation door, and the gas distribution system is installed on the left and right sides of the operation box. The gas distribution system includes a vent pipe, a rubber hose, a gas flow meter probe, a nitrogen blowing needle, a sliding rack, a gear, and a slider. Connect the nitrogen blowing needle, the upper side of the sliding rack is connected to the gear, and the bottom is connected to the slider. The operation box is connected to the slide rail in the metal bath through the sliding rack and slider of the gas distribution system. The gas distribution system is installed above the metal bath. The sliding rack and slider of the gas distribution system can control the vertical rolling of the gas distribution system and horizontal sliding to achieve the effect of automatic control. The metal bath includes a sample placement groove, a slide rail, and a temperature-insulating rubber strip, and the temperature-insulating rubber strip is installed on the metal bath, and both sides of the metal bath are connected to the slide rails.

As a preferred solution of the utility model, the air inlet is connected with a semiconductor heating block, and the control panel can set whether to heat the nitrogen and the heating temperature, and the hot nitrogen can improve the nitrogen blowing efficiency.

As a preferred solution of the utility model, the sliding rack and slide block on the gas distribution system can control the vertical sliding and horizontal sliding of the gas distribution system to achieve the effect of automatic control. The automatic design greatly improves the operation efficiency and shortens the time required for sample concentration.

There are two different sample loading models, one nitrogen blowing can prepare at least four 50mL samples or six 10mL samples, 50mL test tube tank can prepare 32 samples, and 10mL test tube tank can prepare 48 samples.

As a preferred solution of the utility model, each row of sample placement tanks has an independent metal bath for heating, and the storage temperature after nitrogen blowing can be set to preserve samples for a long time. Set different nitrogen temperature, nitrogen blowing time, metal bath temperature, and storage temperature according to the number of samples and solution concentration.

As a preferred solution of the utility model, the operation door is installed with sealed magnetic strips around it. After nitrogen blowing, it can be stored at low temperature. After all nitrogen blowing is completed, the air spring will automatically close, and the device can be filled with nitrogen to store samples for a long time.

Description of drawings

Fig. 1 is a structural representation of a novel nitrogen blowing instrument described in the utility model.

Fig. 2 is a schematic structural diagram of the gas distribution system of this embodiment. The gas distribution system 20 includes a vent pipe 19 , a rubber hose 26 , a gas flow meter probe 25 , a nitrogen blowing needle 16 , a sliding rack 17 , a gear 18 , and a slider 15 .

Fig. 3 is a sectional view of the control panel of this example. Including semiconductor temperature probe 27, tee pipe 28, air spring 24.

Fig. 4 is a structural schematic diagram of the metal bath of this example. The metal bath 11 includes a temperature-insulating rubber strip 8 , a sample placement groove 9 , and a slide rail 10 .

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in FIG. 1 , a novel automatic nitrogen blowing instrument is characterized in that: a control panel 7 , an operation box 21 , and a metal bath 11 . The control panel 7 includes a switch 5, a temperature display 1, a nitrogen temperature display 2, a liquid crystal display 3, a gas flow meter 4, a flow adjustment button 6, and an air spring 24 right above. The operation box 21 includes a gas distribution system 20 , an operation door 12 , a handle 13 , and a sealing magnetic strip 14 . The gas distribution system 20 includes a vent pipe 19 , a rubber hose 26 , a gas flow meter probe 25 , a slider 15 , a nitrogen blowing needle 16 , a sliding rack 17 , and a gear 18 . The metal bath 11 is installed under the operation box 21 , and the metal bath 11 includes a temperature-insulating rubber strip 8 , a sample placement groove 9 , and a slide rail 10 .

Embodiment 1 In the above structure, start the switch 5, open the operation door 12, preheat the metal bath 11 to the specified temperature in advance, and blow nitrogen for 5 minutes to exhaust the air in the operation box 21. The sample tube is placed on the sample placement tank 9, and the temperature of each metal bath 11 will be sequentially displayed on the temperature display 1 in real time. Set the nitrogen heating temperature on the control panel 7, the nitrogen temperature will be displayed on the nitrogen temperature display 2, set the temperature of each row of metal baths, nitrogen blowing time, number of nitrogen blowing rows, storage temperature after nitrogen blowing, the minimum temperature is 4 °C . The 50mL sample placement tank 9 is a row of 8 nitrogen blowing needles 16, and the 4 nitrogen blowing needles 16 are controlled by a separate air inlet and the gas flow meter 4, and the 10mL sample placement tank 9 is a row of 12 nitrogen blowing needles 16 , 6 nitrogen blowing needles 16 are controlled by a sub-inlet and gas flow meter 4. The total nitrogen gas is introduced from the air inlet 23 and blows to the sample through the nitrogen blowing needle 16 of the gas distribution system 20. The gas flow rate can be adjusted by the flow adjustment knob 6, which can control the nitrogen flow rate and switch of each sample. The real-time flow rate will be displayed on the gas flow meter 4 on. After the control panel 7 is set, the gas distribution system 20 starts to start, the gear 18 rolls down, and the nitrogen blowing needle 16 drops to a designated position, and the nitrogen blowing is instructed according to the setting. After a row of nitrogen blowing ends, the sliding rack 17 and the gear 18 interact, the gas distribution system 20 rises, and at the same time, the slide block 15 will slide backwards to the next designated position to start the next row of nitrogen blowing. The entire blowing structure is carried out in the operation box 20, and the internal gas will be discharged to the outside through the air spring 24. After all the nitrogen blowing ends, the air spring 24 will automatically close to keep the operation box 21 filled with nitrogen.

As a preferred solution of the present invention, nitrogen can be heated to improve nitrogen blowing efficiency. Each row of sample placement tanks is set with a separate metal bath heating and storage temperature after nitrogen blowing. Set up two different types of sample placement tanks and place a large number of samples, and realize large-scale automatic nitrogen blowing through the settings of gears and slide rails. The switch of the air spring can be controlled by the microelectronic design, which increases the time for storing samples.

The basic principles, main features and advantages of the present utility model have been shown and described above. The utility model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model.

Utilize the utility model, according to the step described in embodiment 1, detect the residual content of omethoate pesticide in the tealeaves, carry out contrast with common nitrogen blowing instrument. 12 samples were carried out for 3 repeated tests to investigate the positive effect of the utility model.

Table 1 Comparison of nitrogen blowing results of two devices.

Note: RSD is the relative standard deviation, and different uppercase and lowercase letters indicate that the components are significantly different at P<0.01 and P<0.05 levels, respectively. The nitrogen heating temperature of the utility model is 40°C, the metal bath temperature is 50°C, 12 samples are blown with nitrogen at a time and the nitrogen blowing time is 1 hour, and the sample storage temperature is 4°C. 12 samples were blown with nitrogen at a time using a common nitrogen blowing instrument and the nitrogen blowing time was 2 hours; the water content of the samples was measured with anhydrous copper sulfate.

As can be seen from Table 1, the utility model greatly shortens the nitrogen blowing time and improves the sample purity. In addition, the utility model only needs to add samples once to realize automatic control, and the control group needs to manually add samples three times and cannot be cooled and stored. Furthermore, in the utility model, all samples are blown with nitrogen under the same condition during the whole experiment process, and the error between samples is small.

Claims (5)

1. a kind of closed nitrogen blows automatics, it is characterised in that：Including control zone, control box, metal bath；Connect above control box Connect control zone, lower section connection metal bath；Control zone passes through control panel control operation case, metal bath；Include air inlet on control zone On mouth, semiconductor heat block, air spring and control panel, control panel install switch, LCDs, temperature indicator, Nitrogen temperature display, gas flowmeter, flow regulation button；Control box includes air distribution system, operation door, handle, sealing magnetic Bar；Air distribution system includes breather pipe, glue flexible pipe, gas flowmeter probe, nitrogen blow needle, sliding rack, gear, sliding block；Distribution system System is arranged on above metal bath, the slide rail connection in sliding rack, sliding block and the metal bath of air distribution system；Metal bath is arranged on behaviour Make below case, sample standing groove, slide rail, thermal insulation rubber strip are installed in metal bath.

2. a kind of closed nitrogen as claimed in claim 1 blows automatics, it is characterised in that：Air inlet is connected with semiconductor heating Whether block, control panel can be set to nitrogen heating and heating-up temperature, and hot nitrogen can improve nitrogen and blow efficiency.

3. a kind of closed nitrogen as claimed in claim 1 blows automatics, it is characterised in that：The sliding rack of air distribution system and Sliding block can control the vertical rolling of air distribution system and level to slide, and reach that automatic nitrogen blows effect.

4. a kind of closed nitrogen as claimed in claim 1 blows automatics, it is characterised in that：There are two kinds of models on metal bath Sample standing groove, each column sample standing groove has an independent metal bath heating, can set after metal bath temperature and nitrogen blows Storage temperature；Blown the time according to the nitrogen number of sample is different with solution concentration setting, metal bath temperature and storage temperature.

5. a kind of closed nitrogen as claimed in claim 1 blows automatics, it is characterised in that：Operate door surrounding sealing magnetic stripe Install, after whole nitrogen blowing beams, air spring can be closed automatically, sample can be preserved for a long time full of nitrogen in device.