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CN-122016446-A - Focusing device for pre-concentration instrument

CN122016446ACN 122016446 ACN122016446 ACN 122016446ACN-122016446-A

Abstract

The invention discloses a focusing device for a pre-concentration instrument, which comprises a shell, a refrigerant pipeline, an interlayer sleeve and a sample transmission pipe, wherein the interlayer sleeve is sleeved on the sample transmission pipe, the interlayer sleeve and the sample transmission pipe are arranged in the refrigerant pipeline, the refrigerant pipeline is arranged in a cavity enclosed by the shell, a first branch pipe used for introducing refrigerant into the refrigerant pipeline is further arranged on the refrigerant pipeline, two pipe orifices of the refrigerant pipeline and the pipe orifice of the first branch pipe penetrate through the outer wall of the shell, the refrigerant pipeline is provided with a plurality of through holes used for spraying refrigerant, and a refrigerant outlet communicated with the cavity is further formed in the outer wall of the shell. The invention has the advantages of simple structure, low use cost, high-efficiency utilization of the refrigerant and the like.

Inventors

  • ZHANG YONGZHEN
  • YUE PIN
  • LEI XIAOBIN
  • CHEN JIJIE

Assignees

  • 优泰(湖南)环保科技有限责任公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. A focus ware for preconcentrator, includes casing (1), refrigerant pipeline (2), interlayer sleeve pipe (3) and sample transmission pipe (4), interlayer sleeve pipe (3) cover is established on sample transmission pipe (4), interlayer sleeve pipe (3) and sample transmission pipe (4) set up in refrigerant pipeline (2), refrigerant pipeline (2) set up in cavity (5) that casing (1) encloses, still be equipped with on refrigerant pipeline (2) and be used for the refrigerant to let in first branch pipe (6) of refrigerant pipeline (2), two mouth of pipe and the mouth of pipe of first branch pipe (6) of refrigerant pipeline (2) all pass the outer wall of casing (1), refrigerant pipeline (2) are equipped with a plurality of through-holes (7) that are used for refrigerant spun, still set up on the outer wall of casing (1) with refrigerant export (8) of cavity (5) intercommunication.
  2. 2. The focuser for a pre-concentrator of claim 1 wherein the refrigerant tubing (2), the spacer sleeve (3) and the sample transfer tube (4) are all U-shaped tubes.
  3. 3. A focussing device for a preconcentrator according to claim 1, wherein the two nozzles of the refrigerant conduit (2) are connected to the housing (1) by a first sealing assembly (9).
  4. 4. A focus for a preconcentrator according to claim 3, wherein the first sealing assembly (9) comprises a sealing joint (91), a first sealing ferrule (92) and a first ferrule nut (93).
  5. 5. The focuser for a pre-concentrator of claim 1 further comprising a tee joint (10), a first port (101) of the tee joint (10) being in communication with the spacer sleeve (3), a second port (102) of the tee joint (10) being for the passage of heating gas, the third port (103) being sealed by a second sealing assembly (11), one end of the sample transfer tube (4) passing through the first port (101) and the third port (103) of the tee joint (10).
  6. 6. The focus for a pre-concentrator according to claim 5, wherein the first interface (101) is sealingly connected to the spacer sleeve (3) by a third sealing assembly (12).
  7. 7. The focuser for a preconcentrator of claim 5, wherein the second seal assembly (11) comprises a second seal ferrule (111) and a second ferrule nut (112).
  8. 8. The focuser for a preconcentrator of claim 6, wherein the third seal assembly (12) comprises a third seal ferrule (121) and a third ferrule nut (122).
  9. 9. A focussing device for a preconcentrator according to any of claims 1 to 8, wherein the sample delivery tube (4) is a capillary metal tube or a quartz tube.
  10. 10. A focussing device for a preconcentrator according to any of claims 1 to 8, wherein the spacer sleeve (3) is of thin-walled construction.

Description

Focusing device for pre-concentration instrument Technical Field The invention mainly relates to the technical field of gas detection equipment, in particular to a focusing device for a pre-concentration instrument. Background In the VOC preconcentration instrument, the focus ware is a key part, mainly plays the effect of carrying out secondary concentration and focusing to target compound to more high-efficient introduction sample detects with follow-up analytical instrument (such as gas chromatograph) for example, focus ware can replace manual introduction needle sample introduction, guarantees the uniformity of introduction. The existing refrigerating modes of the focusing device mainly comprise Stirling refrigeration, electronic refrigeration and refrigerant refrigeration, because Stirling refrigeration cost is too high and few, electronic refrigeration is limited by the problems of power, refrigeration efficiency, equipment volume, noise, vibration and the like, limit refrigeration can only reach-80 ℃, but common VOCs are of hundreds of types, boiling point temperature ranges from 120 ℃ to-126 ℃ are different, therefore VOCs target substances lower than refrigeration temperature cannot be effectively grasped through low temperature, and the refrigeration temperature of the refrigerant can reach-200 ℃, so that most of the prior art adopts the mode that the refrigerant is sprayed onto a heat conducting piece, and the target substances are cooled through the heat conducting piece. How to effectively utilize the refrigerant is a difficult point of each manufacturer, because the refrigerant is only in short local contact after being sprayed on the heat conducting member, a large amount of refrigerant is required to be continuously sprayed to cover the heat conducting member, and a large amount of refrigerant is input to cause great temperature fluctuation. After flowing down from the heat conducting member, the refrigerant is generally directly discharged, and the discharged gas contains a large amount of gasified liquid refrigerant (in a semi-gas and semi-liquid state) which causes a large amount of waste, and the refrigerant is generally liquid nitrogen or liquid helium, so that the cost is very high, the use cost of equipment is high, and the refrigerant tank needs to be replaced frequently. How to realize the effective utilization of the refrigerant is a technical problem to be solved by the person skilled in the art. Disclosure of Invention Aiming at the technical problems existing in the prior art, the invention provides the focusing device for the pre-concentration instrument, which has the advantages of simple structure, low use cost and capability of realizing efficient utilization of the refrigerant. In order to solve the technical problems, the invention adopts the following technical scheme: A focus ware for preconcentration appearance, includes casing, refrigerant pipeline, interlayer sleeve pipe and sample transmission tube, interlayer sleeve pipe sets up on the sample transmission tube, interlayer sleeve pipe and sample transmission tube set up in the refrigerant pipeline, the refrigerant pipeline sets up in the cavity that the casing encloses, still be equipped with on the refrigerant pipeline and be used for the refrigerant to let in the first branch pipe of refrigerant pipeline, two mouth of pipe of refrigerant pipeline and the mouth of pipe of first branch pipe all pass the outer wall of casing, the refrigerant pipeline is equipped with a plurality of through-holes that are used for refrigerant spun, still seted up the refrigerant export with the cavity intercommunication on the outer wall of casing. As a further improvement of the invention, the refrigerant pipeline, the interlayer sleeve and the sample transmission pipe are all U-shaped pipes. As a further development of the invention, the two nozzles of the refrigerant line are connected to the housing by means of a first sealing assembly. As a further development of the invention, the first sealing assembly comprises a sealing joint, a first sealing ferrule and a first ferrule nut. The invention further comprises a tee joint, wherein a first interface of the tee joint is communicated with the interlayer sleeve, a second interface of the tee joint is used for introducing heating gas, a third interface is sealed through a second sealing assembly, and one end of the sample transmission pipe passes through the first interface and the third interface of the tee joint. As a further development of the invention, the first connection is connected with the spacer sleeve in a sealing manner by means of a third sealing assembly. As a further development of the invention, the second sealing assembly comprises a second sealing ferrule and a second ferrule nut. As a further development of the invention, the third sealing assembly comprises a third sealing ferrule and a third ferrule nut. As a further improvement of the invention, the sample transmi