CN-224202828-U - Sealed sampling membrane holds in palm and VOCs on-line monitoring equipment

Abstract

The utility model discloses a sealed sampling membrane support and VOCs on-line monitoring equipment, which belongs to the technical field of environmental monitoring, wherein the sealed sampling membrane support comprises a membrane support block and a membrane pressing block, a membrane tray is arranged between the membrane support block and the membrane pressing block, the membrane tray is cylindrical, the bottom of the membrane tray is of a porous structure, a membrane pressing ring which is in a closed ring shape after installation is arranged in the membrane tray, a limit bulge is arranged on the inner side wall of the membrane tray, the lower surface of the limit bulge is an inclined surface, a first cavity is formed between the membrane support block and the membrane tray, a second cavity is formed between the membrane support block and the membrane pressing block, sealing devices are arranged on the contact surfaces of the membrane support block and the membrane tray and the membrane pressing block, an air inlet joint is arranged on the membrane support block, an air outlet joint is arranged on the membrane pressing block, and a locking device is arranged on the outer sides of the membrane support block and the membrane pressing block. The sealed sampling membrane support and VOCs on-line monitoring equipment disclosed by the utility model have good sealing property and accurate sampling value.

Inventors

• WANG PENGJIAO
• HUANG FENGFENG
• LIAO YIBIN
• YU TENGYUE
• ZHANG CHUNCHAO
• WANG BINGTAO
• LUO XIAO

Assignees

• 北京鹏宇昌亚环保科技有限公司

Dates

Publication Date

20260505

Application Date

20250506

Claims (9)

1. 1. The utility model provides a sealed type sampling membrane holds in palm, its characterized in that, including relative membrane support piece and the membrane briquetting that sets up, be equipped with the membrane tray that is used for bearing filter membrane between membrane support piece and the membrane briquetting, wherein: The membrane tray is cylindrical, the bottom of the membrane tray is of a porous structure, a membrane compression ring which is in a closed ring shape after being installed is arranged in the membrane tray, a limit bulge is arranged on the inner side wall of the membrane tray, and the lower surface of the limit bulge is an inclined plane capable of extruding and fixing the membrane compression ring to fix the filter membrane; A first cavity is formed between the film support block and the film tray, a second cavity is formed between the film tray and the film pressing block, sealing devices are arranged on the contact surface of the film support block and the film tray and the contact surface of the film tray and the film pressing block, an air inlet joint is arranged on the film support block, and an air outlet joint is arranged on the film pressing block; The outside of membrane riding block and membrane briquetting is equipped with the locking device who is used for extrusion locking two relative positions.
2. 2. The sealed sampling membrane holder of claim 1, wherein the membrane pressure ring is a C-shaped membrane pressure ring with an opening; or the membrane compression rings are two semicircular membrane compression rings.
3. 3. The sealed sampling membrane holder of claim 1, wherein the membrane pressure ring is provided with radial through holes.
4. 4. The sealed sampling membrane holder of claim 1, wherein the membrane holder block is provided with a sealing ring accommodating groove on a contact surface with the membrane tray and the membrane pressing block is provided with a silica gel sealing ring arranged in the sealing ring accommodating groove.
5. 5. The sealed sampling membrane support according to claim 1, wherein one end of the membrane pressing block, which is close to the membrane supporting block, is provided with a containing groove, the outer diameter of the membrane tray is smaller than or equal to the inner diameter of the containing groove, and one end of the membrane supporting block, which is close to the membrane pressing block, is provided with a plug-in part matched with the containing groove.
6. 6. The sealed sampling membrane holder of claim 5, wherein the locking device is a membrane holder lock nut sleeved on the membrane pressing block, the membrane holder lock nut comprises an annular main body and a blocking portion located at the lower end of the annular main body and extending inwards and matched with the outer end face of the membrane pressing block, an inner thread is arranged on the inner side of the upper end of the annular main body, and an outer thread matched with the inner thread is arranged on the outer side of the upper portion of the inserting portion of the membrane holder block.
7. 7. The sealed sampling membrane holder according to claim 1, wherein the inner sides of the tail ends of the air inlet connector and the air outlet connector are provided with inverted horn mouths, clamping sleeves are arranged in the inverted horn mouths, and nuts capable of pushing the clamping sleeves to move are connected with the outer side threads of the air inlet connector and the air outlet connector.
8. 8. The sealed sampling membrane holder of claim 1, wherein the first cavity and the second cavity are both frustum-shaped, and the lower bottom surfaces of the two frustums are oppositely arranged.
9. 9. VOCs on-line monitoring equipment, characterized by comprising the sealed sampling membrane support of any one of claims 1-8.

Description

Sealed sampling membrane holds in palm and VOCs on-line monitoring equipment Technical Field The utility model relates to the technical field of environmental monitoring, in particular to a sealed sampling membrane support and VOCs on-line monitoring equipment. Background VOCs (Volatile Organic Compounds ) are organic compounds having a saturated vapor pressure of 70Pa or more at normal temperature and a boiling point of 260 ℃ or less at normal pressure, or all organic compounds having a vapor pressure of 10Pa or more and having volatility at 20 ℃. VOCs are involved in the formation of ozone and secondary aerosols in the atmospheric environment, which have an important impact on regional atmospheric ozone pollution, PM2.5 pollution. VOCs are important precursors for causing city dust haze and photochemical smog, and are mainly derived from the processes of coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and use and the like. VOCs have a great impact on environmental safety and are dangerous to human health, so that detection and treatment of VOCs produced in industrial activities and daily living are required. The existing VOCs on-line monitoring equipment can collect and analyze gas, output the analysis result of the VOCs and provide reference for the formulation of pollution control strategies. The sampling device of VOCs on-line monitoring equipment generally utilizes the filter membrane to carry out filtration collection to gas, and the better the leakproofness of sampling device, the more accurate the sampling result. The existing sampling device in the market has the problems of certain sealing and leakage, and the main reason is that the sampling device is not provided with a sealing ring, or the sealing ring is directly contacted with a filter membrane, and the filter membrane is breathable, so that the complete sealing effect cannot be achieved. When the sampling device is applied to high-flow VOCs monitoring equipment (for example, the particulate matter sampling flow is a few liters per minute), the leakage problem can be ignored, but when the sampling device is applied to low-flow VOCs monitoring equipment (for example, the particulate matter sampling flow is a few milliliters per minute), the sampling device has leakage, and the sampling numerical result can be influenced. Disclosure of utility model Therefore, the embodiment of the utility model provides the sealed sampling film support and VOCs on-line monitoring equipment which are good in sealing performance and accurate in sampling value. In order to solve the technical problems, the utility model provides the following technical scheme: In one aspect, the utility model provides a sealed sampling membrane support, which comprises a membrane support block and a membrane pressing block which are oppositely arranged, wherein a membrane tray for supporting a filter membrane is arranged between the membrane support block and the membrane pressing block, and the membrane tray comprises: The membrane tray is cylindrical, the bottom of the membrane tray is of a porous structure, a membrane compression ring which is in a closed ring shape after being installed is arranged in the membrane tray, a limit bulge is arranged on the inner side wall of the membrane tray, and the lower surface of the limit bulge is an inclined plane capable of extruding and fixing the membrane compression ring to fix the filter membrane; A first cavity is formed between the film support block and the film tray, a second cavity is formed between the film tray and the film pressing block, sealing devices are arranged on the contact surface of the film support block and the film tray and the contact surface of the film tray and the film pressing block, an air inlet joint is arranged on the film support block, and an air outlet joint is arranged on the film pressing block; The outside of membrane riding block and membrane briquetting is equipped with the locking device who is used for extrusion locking two relative positions. Further, the membrane press ring is a C-shaped membrane press ring with an opening; or the membrane compression rings are two semicircular membrane compression rings. Further, the membrane compression ring is provided with a radial through hole. Further, the contact surface of the membrane support block and the membrane tray and the contact surface of the membrane pressing block and the membrane tray are respectively provided with a sealing ring accommodating groove, and the sealing device is a silica gel sealing ring arranged in the sealing ring accommodating groove. Further, the one end that the membrane briquetting is close to the membrane support piece is equipped with the holding tank, the external diameter of membrane tray is less than or equal to the internal diameter of holding tank, the membrane support piece is close to the one end of membrane briquetting be equipped with holding tank matched with