CN215727203U

CN215727203U - Gas purification system for laboratory detection equipment

Info

Publication number: CN215727203U
Application number: CN202122113615.3U
Authority: CN
Inventors: 李磊; 杨娟娟
Original assignee: Shandong Longhua New Material Co ltd
Current assignee: Shandong Longhua New Material Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-02-01
Anticipated expiration: 2031-09-02

Abstract

The utility model relates to the technical field of laboratory equipment, in particular to a gas purification system for laboratory detection equipment. The gas purification system for the laboratory detection equipment comprises a gas inlet main pipeline, a cold trap and a gas outlet main pipeline which are sequentially connected; the gas inlet main pipeline is connected with a gas cylinder pipeline and a workshop gas pipeline, and a primary pressure reducing valve and a secondary pressure reducing valve are arranged on the gas cylinder pipeline and the workshop gas pipeline; the cold trap comprises an inner container and a cooling liquid cavity, an air inlet pipe of the inner container is connected with an air inlet main pipeline, an air outlet pipe is connected with an air outlet main pipeline, and cooling liquid is filled in the cooling liquid cavity. According to the gas purification system for the laboratory detection equipment, disclosed by the utility model, the pressure of the gas circuit pipeline is stable, and the gas circuit air is purified, so that the measurement precision is improved.

Description

Gas purification system for laboratory detection equipment

Technical Field

The utility model relates to the technical field of laboratory equipment, in particular to a gas purification system for laboratory detection equipment.

Background

Gas circuit systems are commonly used in precision instrumentation, such as gas chromatographs and flame photometers. The flame photometer is used for testing the content of potassium ions and sodium ions in a sample, and the gas chromatograph is mainly applied to petrochemical analysis, environmental analysis, food analysis, medical analysis, physical and chemical research, polymer analysis and the like. The gas chromatography is a separation analysis method with high analysis speed and high separation efficiency, because the gas phase has high transmission speed of a sample, so that the components of the sample can reach equilibrium between the mobile phase and the stationary phase instantly, and in addition, many materials can be selected as the stationary phase. The gas chromatograph consists of the following five systems: the system comprises a gas path system, a sample introduction system, a separation system, a temperature control system and a detection recording system.

Because the pneumatic instrument is more accurate, wherein nozzle and orifice are more, and their latus rectum is less, so the purity requirement to the air supply is higher, mainly should pay attention to following several aspects:

(1) solid impurities: dust in the atmosphere or rust scale in a pipeline, the particle diameter of which is generally not more than 20 μm; for a fluidic element, the diameter must not be greater than 5 μm.

(2) Oil: the oil comes from the lubricating oil of the air compressor cylinder, so an oil-free air compressor should be used. If an oil-containing air compressor is used, the oil content in the air is not more than 15mg/m³。

(3) Corrosive gas: the air sucked by the air compressor must not contain SO₂、H₂S、HCl、NH₄、Cl₂If the corrosive gas cannot be avoided, the sucked air is pretreated by a washing pretreatment device.

(4) Moisture content: the humidity of the air supply must be strictly limited to prevent condensation or icing in the air supply duct and the air path of the instrument. The pressure dew point of the air supply can generally be controlled to be within a range of 5-10 deg.c below the ambient minimum temperature.

The existing gas path system has the following problems: the traditional gas circuit system does not control the pressure on the pipeline, so that the pipeline pressure is suddenly high and suddenly low, and further equipment is damaged; the original impure air can cause the up-and-down movement of the test baseline of a gas chromatograph or a flame photometer, and the detection precision is influenced. Above problem exists can influence precision instruments and detect the precision, and then influences product quality stability, consequently, needs improve laboratory gas circuit system, control gas circuit pressure to carry out purification treatment to the gas circuit air.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the utility model provides a laboratory is gas purification system for check out test set, gas circuit pipeline pressure is stable, and purifies the gas circuit air, has improved measurement accuracy.

The gas purification system for the laboratory detection equipment comprises a gas inlet main pipeline, a cold trap and a gas outlet main pipeline which are sequentially connected; the gas inlet main pipeline is connected with a gas cylinder pipeline and a workshop gas pipeline, and a primary pressure reducing valve and a secondary pressure reducing valve are arranged on the gas cylinder pipeline and the workshop gas pipeline; the cold trap comprises an inner container and a cooling liquid cavity, an air inlet pipe of the inner container is connected with an air inlet main pipeline, an air outlet pipe is connected with an air outlet main pipeline, and cooling liquid is filled in the cooling liquid cavity.

The gas inlet main pipeline adopts a gas cylinder and two gas paths in a workshop to provide laboratory gas, and two-stage pressure reduction is arranged on the two gas path pipelines, so that the pressure of the gas path pipelines is stabilized, and the damage to detection equipment caused by the sudden high and low pipeline pressures is avoided; and conventional components such as a pressure gauge, a valve and the like are arranged on the gas cylinder pipeline and the workshop gas pipeline, and one gas circuit pipeline is kept open and the other gas circuit pipeline is kept closed during gas utilization.

The cooling liquid cavity is provided with a cooling liquid external circulation pipeline, and a circulation refrigerator is arranged on the cooling liquid external circulation pipeline. The cooling is carried out through the external circulation of the cooling liquid, and sufficient cooling capacity is provided for the gas in the inner container.

And a filter screen and an active carbon layer are arranged in the inner container. The activated carbon layer is arranged below the filter screen, and the activated carbon layer and the filter screen are arranged between the bottom of the air inlet pipe and the bottom of the air outlet pipe of the inner container. After the gas enters the inner container, a part of impurities are removed through cooling, then the gas is sequentially adsorbed by the activated carbon layer and filtered by the filter screen, the impurities are further removed, and finally solid impurities, oil, corrosive gas and moisture in the air are removed, so that the effect of air purification is achieved.

The main gas outlet pipeline is connected with a plurality of gas branch pipelines, and each gas branch pipeline is provided with conventional components such as a pressure gauge, a valve and the like. The purified gas is connected with different detection devices through gas branch pipelines to supply gas to the devices.

The working principle of the gas purification system for the laboratory detection equipment is as follows:

a workshop gas pipeline is added on the basis of the original gas cylinder pipeline, and two gas circuits are connected in parallel to keep one gas circuit for supplying gas; meanwhile, a primary pressure reducing valve and a secondary pressure reducing valve are respectively arranged on the two gas circuit pipelines to stabilize the gas supply pressure of the gas circuit; and then introducing the gas into the cold trap, removing solid impurities, oil, corrosive gas and moisture in the air under the combined action of cooling liquid cooling, activated carbon layer adsorption and filtering by a filter screen, introducing the purified gas into each gas distribution pipeline through a gas outlet main pipeline, supplying gas to the detection equipment, and ensuring the measurement precision of the detection equipment.

Compared with the prior art, the utility model has the following beneficial effects:

(1) according to the gas purification system for the laboratory detection equipment, the gas bottle and the workshop are adopted to provide laboratory gas, and the two gas circuit pipelines are provided with the secondary pressure reducing valves, so that the pressure of the gas circuit pipelines is stabilized, and the detection equipment is prevented from being damaged due to the fact that the pipeline pressure is suddenly high or low;

(2) according to the gas purification system for the laboratory detection equipment, the cold trap is arranged, so that solid impurities, oil, corrosive gas and moisture in the air are removed, the effect of air purification is achieved, and the measurement precision of a precision instrument is improved.

Drawings

FIG. 1 is a schematic diagram of a gas purification system for laboratory test equipment according to the present invention;

in the figure: 1. a gas cylinder line; 2. a shop gas line; 3. a primary pressure reducing valve; 4. a secondary pressure reducing valve; 5. an intake main line; 6. a main gas outlet line; 7. a gas distribution pipeline; 8. cold trap; 9. a filter screen; 10. an activated carbon layer; 11. an inner container; 12. a coolant chamber; 13. a circulating refrigerator.

Detailed Description

The present invention is further illustrated by the following examples, but the scope of the present invention is not limited thereto.

Example 1

As shown in fig. 1, the gas purification system for laboratory detection equipment includes a gas inlet main line 5, a cold trap 8 and a gas outlet main line 6 which are connected in sequence; the gas inlet main pipeline 5 is connected with a gas cylinder pipeline 1 and a workshop gas pipeline 2, and a primary pressure reducing valve 3 and a secondary pressure reducing valve 4 are arranged on the gas cylinder pipeline 1 and the workshop gas pipeline 2; the cold trap 8 comprises an inner container 11 and a cooling liquid chamber 12, an air inlet pipe of the inner container 11 is connected with the air inlet main pipeline 5, an air outlet pipe of the inner container is connected with the air outlet main pipeline 6, and cooling liquid is filled in the cooling liquid chamber 12.

The air inlet main pipeline 5 adopts an air bottle and two air paths in a workshop to provide laboratory air, and two-stage pressure reduction is arranged on the two air path pipelines, so that the pressure of the air path pipelines is stabilized, and the damage to detection equipment caused by the sudden high and low pipeline pressures is avoided; and conventional components such as a pressure gauge, a valve and the like are arranged on the gas cylinder pipeline 1 and the workshop gas pipeline 2, and one gas circuit pipeline is kept open and the other gas circuit pipeline is kept closed during gas use.

The cooling liquid chamber 12 is provided with a cooling liquid external circulation pipeline, and a circulation refrigerator 13 is arranged on the cooling liquid external circulation pipeline. And sufficient cold energy is provided for the gas in the inner container 11 by cooling through the external circulation of the cooling liquid.

And a filter screen 9 and an active carbon layer 10 are arranged in the inner container 11. The activated carbon layer 10 is arranged below the filter screen 9, and the activated carbon layer 10 and the filter screen 9 are arranged between the bottom of the air inlet pipe and the bottom of the air outlet pipe of the inner container 11. After the gas enters the inner container 11, a part of impurities are removed through cooling, and then the gas is adsorbed by the activated carbon layer 10 and filtered by the filter screen 9 in sequence, so that the impurities are further removed, and finally, solid impurities, oil, corrosive gas and moisture in the air are removed, and the effect of air purification is achieved.

The main gas outlet pipeline 6 is connected with a plurality of gas distribution pipelines 7, and each gas distribution pipeline 7 is provided with conventional components such as a pressure gauge, a valve and the like. The purified gas is connected with different detection equipment through gas branch pipelines 7 to supply gas to the equipment.

a workshop gas pipeline 2 is added on the basis of an original gas cylinder pipeline 1, and two gas circuits are connected in parallel to keep one gas circuit for supplying gas; meanwhile, a primary pressure reducing valve 3 and a secondary pressure reducing valve 4 are respectively arranged on the two gas circuit pipelines to stabilize the gas supply pressure of the gas circuits; then, gas is introduced into a cold trap 8, solid impurities, oil, corrosive gas and moisture in the air are removed under the combined action of cooling liquid, adsorption of an activated carbon layer 10 and filtration of a filter screen 9, the purified gas is introduced into each gas branch pipeline 7 through a gas outlet main pipeline 6 to supply gas to detection equipment, and the measurement precision of the detection equipment is ensured.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a laboratory is gas purification system for check-out test set which characterized in that: comprises an air inlet main pipeline (5), a cold trap (8) and an air outlet main pipeline (6) which are connected in sequence; the gas inlet main pipeline (5) is connected with the gas cylinder pipeline (1) and the workshop gas pipeline (2), and the gas cylinder pipeline (1) and the workshop gas pipeline (2) are respectively provided with a primary pressure reducing valve (3) and a secondary pressure reducing valve (4); the cold trap (8) comprises an inner container (11) and a cooling liquid chamber (12), an air inlet pipe of the inner container (11) is connected with an air inlet main pipeline (5), an air outlet pipe is connected with an air outlet main pipeline (6), and cooling liquid is filled in the cooling liquid chamber (12).

2. The gas purification system for laboratory testing equipment according to claim 1, wherein: the cooling liquid chamber (12) is provided with a cooling liquid external circulation pipeline, and a circulation refrigerator (13) is arranged on the cooling liquid external circulation pipeline.

3. The gas purification system for laboratory testing equipment according to claim 1, wherein: an activated carbon layer (10) is arranged in the inner container (11).

4. The gas purification system for laboratory testing equipment according to claim 3, wherein: a filter screen (9) is arranged in the inner container (11).

5. The gas purification system for laboratory testing equipment according to claim 4, wherein: the activated carbon layer (10) is arranged below the filter screen (9), and the activated carbon layer (10) and the filter screen (9) are arranged between the bottom of the air inlet pipe and the bottom of the air outlet pipe of the inner container (11).

6. The gas purification system for laboratory testing equipment according to claim 1, wherein: the gas outlet main pipeline (6) is connected with a plurality of gas utilization branch pipelines (7).