Sampling mechanism for VOC automatic sampling and sample reserving instrument

Abstract

The utility model discloses a sampling mechanism for an automatic VOC (volatile organic compound) sampling and reserving instrument. The sampling mechanism comprises an automatic VOC sampling and reserving instrument body and a pulling component, the VOC automatic sampling and sample reserving instrument body comprises an instrument main body, a sampler and a dustproof plate; the sampler is fixedly arranged on the instrument main body; the dustproof plate is connected with the sampler through a pulling assembly; the pulling assembly comprises a pulling groove, a pulling block, a pulling handle, a positioning groove and a positioning block; a pulling groove is formed in the sampler; the pulling block is arranged in the pulling groove in a sliding mode and fixedly connected with the dustproof plate. The pulling handle is fixedly arranged on the outer surface of the pulling block; positioning grooves are symmetrically formed in the two sides of the inner wall of the pulling groove. The two positioning blocks are symmetrically and fixedly arranged on the two sides of the pulling block, and the positioning blocks are in sliding fit with the positioning groove, the sampling mechanism for the VOC automatic sampling and sample reserving instrument is simple and reasonable in structure and ingenious in design, the dustproof plate can be taken out of the sampler so as to be cleaned, and the using effect is good.

Description

Technical Field

[0001] This utility model relates to the field of VOC automatic sampling and retention technology, specifically a sampling mechanism for an automatic VOC sampling and retention instrument. Background Technology

[0002] VOCs (volatile organic compounds) refer to organic compounds that are easily volatilized at room temperature. Their boiling points are usually between 50℃ and 250℃. According to the World Health Organization (WHO) definition, VOCs refer to various organic compounds with a boiling point between 50℃ and 260℃ under normal pressure. VOCs include a variety of chemical substances, such as formaldehyde, benzene, and propylene, and are widely present in daily life and industrial production, such as chemical products, building materials, cleaning agents, and automobile exhaust. Common sampling methods for automatic VOC sampling and retention instruments include diffusion sampling, pump suction sampling, and probe sampling.

[0003] For example, Chinese utility model patent CN214584350U provides a VOC sampling device, which includes a sampling pump. An exhaust pipe and an intake pipe are fixedly connected to the front of the sampling pump. It also includes a locking mechanism, of which two are provided, each fixedly sleeved on the exhaust pipe and intake pipe. The locking mechanism includes a rectangular block, a locking block, a circular ring plate, a spring, and a sliding tube. A square groove is provided on the front of the rectangular block. Four locking blocks are provided, each penetrating the upper, lower, left, and right inner walls of the square groove. The circular ring plate is fixedly connected to the rear end of the rectangular block, and the spring is fixedly connected to the front of the circular ring plate and sleeved on the rectangular block. This VOC sampling device only requires dragging the sliding tube to move backward relative to the rectangular block to complete the connection between the exhaust pipe and intake pipe and the gas collection hood and sampling bag. The operation is very simple and convenient, effectively improving work efficiency.

[0004] When using an automatic VOC sampling and retention instrument to detect VOCs, a sampling mechanism is required to sample the VOCs. However, existing sampling mechanisms require dust screens to be installed inside the sampling mechanism to block dust and other impurities in the air. The dust screens on existing sampling mechanisms are mostly fixedly embedded inside the sampling mechanism, which makes it inconvenient to clean the dust screens and thus affects the effectiveness of the sampling mechanism. Utility Model Content

[0005] The purpose of this invention is to provide a sampling mechanism for an automatic VOC sampling and retention instrument, so as to solve the problem of inconvenience in cleaning the dustproof net mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sampling mechanism for an automatic VOC sampling and retention instrument, comprising an automatic VOC sampling and retention instrument body and a pull assembly; the automatic VOC sampling and retention instrument body includes an instrument body, a sampler, and a dustproof plate; the sampler is fixedly mounted on the instrument body; the dustproof plate is connected to the sampler via the pull assembly; the pull assembly includes a pull groove, a pull block, and a pull handle; the sampler has a pull groove; the pull block is slidably disposed within the pull groove and fixedly connected to the dustproof plate; the pull handle is fixedly mounted on the outer surface of the pull block.

[0007] Preferably, the sampler includes a flow section and an aeration section; the flow section is connected to the instrument body.

[0008] Preferably, the air expansion section is a hollow frustum-shaped structure, and the dimension of the air expansion section on the side closer to the instrument body is smaller than the dimension of the air expansion section on the side farther from the instrument body.

[0009] Preferably, the pulling component further includes a positioning groove and a positioning block; the inner wall of the pulling groove is symmetrically provided with positioning grooves on both sides; the two positioning blocks are symmetrically fixed on both sides of the pulling block, and the positioning blocks are slidably engaged with the positioning grooves.

[0010] Preferably, it also includes a resistance component; the resistance component is arranged on the positioning block.

[0011] Preferably, the resistance component includes a resistance groove and a resistance block; the positioning groove has a resistance groove inside; the resistance block is fixed on the positioning block and contacts the resistance groove.

[0012] Preferably, the resistance block has a stepped structure, and the shape of the resistance block is adapted to the shape of the resistance groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, by setting up a pulling component, allows the dustproof plate to slide within the pulling groove by pulling the handle, and the positioning block to slide within the positioning groove, until the pulling block slides out of the pulling groove, allowing the dustproof plate to be cleaned. After cleaning, the pulling block is inserted into the pulling groove, and the positioning block is inserted into the positioning groove, causing the pulling block to slide the dustproof plate in the opposite direction within the pulling groove, and the positioning block to slide in the opposite direction within the positioning groove, until the side of the positioning block contacts the inner wall of the positioning groove. At this point, the dustproof plate moves to its original position. Compared with the prior art, this utility model has a simple and reasonable structure and ingenious design, allowing the dustproof plate to be removed from the sampler for cleaning, and has a better usage effect.

[0015] 2. This utility model sets up a resistance groove and a resistance block, and makes the resistance block contact the resistance groove. The resistance block is set as a stepped structure to facilitate the extension of the contact area between the resistance block and the resistance groove, and to increase the friction between the resistance block and the resistance groove, thereby improving the stability of the position of the pulling block in the pulling groove. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a partially disassembled sectional view of the present invention.

[0019] Figure 4 For the present utility model Figure 2 Enlarged diagram of point A in the middle.

[0020] In the picture:

[0021] 1. VOC automatic sampling and retention instrument body; 2. Pull assembly; 3. Resistance assembly;

[0022] 101. Main body of the instrument; 102. Sampler; 103. Dustproof plate;

[0023] 1021. Distribution Department; 1022. Gas Expansion Department;

[0024] 201. Pull groove; 202. Pull block; 203. Pull handle; 204. Positioning groove; 205. Positioning block;

[0025] 301. Resistance groove; 302. Resistance block. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1 to 4This utility model provides a technical solution: a sampling mechanism for an automatic VOC sampling and retention instrument, comprising an automatic VOC sampling and retention instrument body 1 and a pulling component 2; the automatic VOC sampling and retention instrument body 1 comprises three parts: an automatic sampling and retention device for early warning of excessive volatile organic compound emissions (photoionization detector PID, continuous monitor, automatic gas bag sampler), a network transmission system, and an early warning operation management platform (software name); when the volatile organic compound emissions from the exhaust stack of a fixed pollution source exceed the system's set value, the system triggers an audible and visual alarm and uses a vacuum chamber, air pump, and other devices to automatically collect and store the volatile organic compound sample in a chemically inert gas bag; simultaneously, monitoring alarms, sampling and retention information are transmitted to the terminal platform; the automatic VOC sampling and retention instrument body 1 comprises an instrument body 101, a sampler 102, and a dustproof plate 103; the sampler 102 is fixed to the instrument body 101; the dustproof plate 103... Plate 103 is connected to sampler 102 via pull assembly 2; pull assembly 2 includes pull groove 201, pull block 202, pull handle 203, positioning groove 204, and positioning block 205; pull groove 201 is provided on sampler 102; pull block 202 is slidably disposed in pull groove 201 and fixedly connected to dustproof plate 103; pull handle 203 is fixedly disposed on outer surface of pull block 202; sampler 102 includes flow section 1021 and expansion section 1022. The gas section 1022; the circulation section 1021 is connected to the instrument body 101; the gas expansion section 1022 is a hollow frustum structure, and the size of the gas expansion section 1022 on the side closer to the instrument body 101 is smaller than the size of the gas expansion section 1022 on the side farther away from the instrument body 101; positioning grooves 204 are symmetrically opened on both sides of the inner wall of the pull groove 201; two positioning blocks 205 are symmetrically fixed on both sides of the pull block 202, and the positioning blocks 205 slide with the positioning grooves 204.

[0028] This invention features a pull assembly 2. By pulling the pull handle 203, the pull block 202 causes the dustproof plate 103 to slide within the pull groove 201, and the positioning block 205 to slide within the positioning groove 204. This continues until the pull block 202 slides out of the pull groove 201, allowing for cleaning of the dustproof plate 103. After cleaning, the pull block 202 is inserted back into the pull groove 201, and the positioning block 205 is inserted into the positioning groove 204. The pull block 202 then causes the dustproof plate 103 to slide in the opposite direction within the pull groove 201, and the positioning block 205 slides in the opposite direction within the positioning groove 204, until the side of the positioning block 205 contacts the inner wall of the positioning groove 204. At this point, the dustproof plate 103 moves back to its original position. Compared to existing technologies, this invention has a simple and reasonable structure, and an ingenious design. It allows the dustproof plate 103 to be removed from the sampler 102 for cleaning, resulting in better performance.

[0029] As a preferred embodiment, it also includes a resistance component 3; the resistance component 3 is arranged on the positioning block 205; the resistance component 3 includes a resistance groove 301 and a resistance block 302; the positioning groove 204 has a resistance groove 301; the resistance block 302 is fixed on the positioning block 205 and contacts the resistance groove 301; the resistance block 302 has a stepped structure, and the shape of the resistance block 302 is adapted to the shape of the resistance groove 301; when the side of the positioning block 205 contacts the inner sidewall of the positioning groove 204, the pulling block 202 and the flow part 1021 form a complete cylindrical structure.

[0030] This invention provides a resistance groove 301 and a resistance block 302, with the resistance block 302 in contact with the resistance groove 301. The resistance block 302 is designed as a stepped structure to extend the contact area between the resistance block 302 and the resistance groove 301, thereby increasing the friction between the resistance block 302 and the resistance groove 301 and improving the stability of the position of the pulling block 202 within the pulling groove 201.

[0031] Working principle: During cleaning, by pulling the handle 203, the pull block 202 causes the dustproof plate 103 to slide within the pull groove 201, and the positioning block 205 to slide within the positioning groove 204. This causes the resistance block 302 to no longer contact the resistance groove 301, until the pull block 202 slides out of the pull groove 201, at which point the dustproof plate 103 can be cleaned. After cleaning, the pull block 202 is inserted into the pull groove 201, and the positioning block 205 is inserted into the positioning groove 204. The pull block 202 causes the dustproof plate 103 to slide in the opposite direction within the pull groove 201, and the positioning block 205 slides in the opposite direction within the positioning groove 204, until the side of the positioning block 205 contacts the inner wall of the positioning groove 204. At this point, the resistance block 302 contacts the resistance groove 301, and the dustproof plate 103 moves back to its original position.

[0032] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sampling mechanism for an automatic VOC sampling and retention instrument, characterized in that, The instrument includes an automatic VOC sampling and retention device body (1) and a pull assembly (2); the automatic VOC sampling and retention device body (1) includes an instrument body (101), a sampler (102) and a dustproof plate (103); the sampler (102) is fixed on the instrument body (101); the dustproof plate (103) is connected to the sampler (102) through the pull assembly (2); the pull assembly (2) includes a pull groove (201), a pull block (202) and a pull handle (203); the sampler (102) has a pull groove (201); the pull block (202) is slidably disposed in the pull groove (201) and fixedly connected to the dustproof plate (103); the pull handle (203) is fixed on the outer surface of the pull block (202).

2. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 1, characterized in that, The sampler (102) includes a flow section (1021) and an aeration section (1022); the flow section (1021) is connected to the instrument body (101).

3. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 2, characterized in that, The expansion section (1022) is a hollow frustum-shaped structure, and the size of the expansion section (1022) on the side closer to the instrument body (101) is smaller than the size of the expansion section (1022) on the side farther away from the instrument body (101).

4. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 1, characterized in that, The pull assembly (2) further includes a positioning groove (204) and a positioning block (205); the inner wall of the pull groove (201) is symmetrically provided with positioning grooves (204) on both sides; the two positioning blocks (205) are symmetrically fixed on both sides of the pull block (202), and the positioning blocks (205) slide with the positioning grooves (204).

5. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 4, characterized in that, It also includes a resistance component (3); the resistance component (3) is arranged on the positioning block (205).

6. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 5, characterized in that, The resistance component (3) includes a resistance groove (301) and a resistance block (302); the positioning groove (204) has a resistance groove (301) inside; the resistance block (302) is fixed on the positioning block (205) and contacts the resistance groove (301).

7. The sampling mechanism for an automatic VOC sampling and retention instrument according to claim 6, characterized in that, The resistance block (302) has a stepped structure, and the shape of the resistance block (302) is adapted to the shape of the resistance groove (301).

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