Sampling device for chemical waste gas detection

Abstract

The utility model discloses a sampling device for chemical waste gas detection, relates to the technical field of chemical waste gas detection, and aims to solve the technical problems that when a plug of the current sampling device is pulled out of an opening of a waste gas storage tank, external air enters, a waste gas sample is diluted, and the detection accuracy is influenced. Comprising a sampling pipe and an air exhaust rod installed in the sampling pipe, a sampling head is fixedly installed at the lower end of the sampling pipe, a plugging piece for plugging an opening of the sampling head is fixedly installed in the sampling pipe, the sampling head comprises a connecting pipe, and a communicated insertion pipe is integrally formed at the lower end of the connecting pipe; according to the utility model, through the matching of the sampling head and the plugging piece, when the sampling head is inserted into the opening of the waste gas tank, the convex block drives the baffle plate to move upwards through the extrusion of the pipe opening, so that the plugging plate is pushed to move upwards to be separated from the bottom of the inner cavity of the connecting pipe, and the communication effect is achieved; and the exhaust gas extraction sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical waste gas detection technology, and more specifically, to a sampling device for chemical waste gas detection. Background Technology

[0002] Chemical production processes generate various waste gases with complex compositions that can pose serious threats to the environment and human health. Accurate waste gas sampling is crucial for effective monitoring and treatment of these gases.

[0003] Currently, some sampling devices, during their design and operation, may allow outside air to enter the device when the plug is pulled out of the waste gas storage tank due to poor sealing or airflow characteristics. This mixed air dilutes the waste gas sample, alters its composition ratio, and results in impure waste gas sampling, affecting the accuracy of waste gas detection and failing to accurately reflect the original state of chemical waste gas. In view of this, we propose a sampling device for chemical waste gas detection. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a sampling device for chemical waste gas detection, so as to solve the technical problem that when the plug of the sampling device is pulled out from the waste gas storage tank, outside air enters, causing dilution of the waste gas sample and affecting the accuracy of detection.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a sampling device for detecting chemical waste gas, including a sampling tube and an internally installed suction rod, wherein a sampling head is fixedly installed at the lower end of the sampling tube, and a sealing component for sealing the opening of the sampling head is fixedly installed inside the sampling tube;

[0006] The sampling head includes a connecting tube, the lower end of which is integrally formed with a communicating insertion tube, and a corresponding movable groove is provided on the side of the insertion tube.

[0007] The sealing component includes a spring, and a sealing plate is fixedly installed at the lower end of the spring to fit against the top of the inner cavity of the connecting tube. The bottom of the sealing plate is integrally formed with two sealing movable grooves of baffles, and each of the two baffles is fixedly provided with a protrusion protruding outward of the insertion tube on the opposite side.

[0008] This invention utilizes the cooperation between the sampling head and the sealing component. When the sampling head is inserted into the exhaust gas tank opening, the compression of the tube opening causes the protrusion to move the baffle upward, thereby pushing the sealing plate upward and separating it from the bottom of the connecting tube's inner cavity, thus achieving a connection. This allows for the extraction of exhaust gas samples from the exhaust gas tank when the suction rod is pulled up. After sample extraction, pulling up the sampling tube causes the sealing plate to automatically reset under the action of a spring, ensuring that the suction port is blocked before the connecting tube is removed from the tank opening, preventing external air from entering. This improves the purity of the extracted sample and enhances the accuracy of subsequent testing.

[0009] Preferably, each of the opposite sides of the movable groove has an arc-shaped positioning block integrally formed near the bottom, and the side of the protrusion has a positioning groove that engages with the positioning block.

[0010] Preferably, the sampling tube has a first external thread on its bottom outer wall, and the connecting tube has a first threaded groove on its inner wall that is adapted to connect with the first external thread.

[0011] Preferably, a hemispherical groove is provided on the outer wall of the connecting pipe, and several anti-slip grooves are also provided vertically on the outer wall of the connecting pipe.

[0012] Preferably, a fixing ring is fixedly provided on the outer wall of the sampling tube, an elastic plate is fixedly provided at the bottom of the fixing ring and close to the position of the slot, and a card block that engages with the slot is fixedly provided on the side of the elastic plate.

[0013] Preferably, the lower end of the insertion tube has a second internal thread on its inner wall, and the outer wall of the filter element has a second external thread that is adapted to and connected to the second internal thread.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the cooperation of the sampling head and the sealing component, allows the sampling head to be inserted into the exhaust gas tank opening. The compression of the tube opening causes the protrusion to move the baffle upward, thereby pushing the sealing plate upward and separating it from the bottom of the connecting tube's inner cavity, thus achieving a connection. In this way, when the suction rod is pulled up, the exhaust gas in the exhaust gas tank can be sampled. After the sample is extracted, when the sampling tube is pulled up, the sealing plate can automatically reset under the action of the spring force, so that the suction port can be blocked before the connecting tube is removed from the tank opening, preventing external air from entering. This can improve the purity of the sample extraction and enhance the accuracy of subsequent testing.

[0016] 2. This utility model also ensures that the baffle will not shift during movement by cooperating with the positioning block and the positioning groove. When the whole is moved to the detection position, it can improve the sealing of the sampling head, and at the same time improve the reliability and stability of the structural fit. It also reduces the phenomenon of gaps caused by shaking during movement, improves the sealing of the waste gas sample storage, and further improves the purity of the waste gas sample extraction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the exploded decomposition structure of this utility model;

[0020] Figure 4 for Figure 2 Enlarged structural diagram of section A;

[0021] Figure 5 This is a cross-sectional structural diagram of the sampling head in this utility model;

[0022] Figure 6 This is a schematic diagram of one usage state of the present invention.

[0023] The following are the labels in the diagram: 1. Sampling tube; 101. Limiting block; 102. First external thread; 103. Fixing ring; 104. Elastic plate; 105. Locking block; 2. Suction rod; 3. Sampling head; 301. Connecting tube; 302. Insertion tube; 303. First thread groove; 304. Movable groove; 305. Positioning block; 306. Second internal thread; 307. Locking groove; 308. Groove; 4. Sealing component; 401. Spring; 402. Sealing plate; 403. Baffle; 404. Protrusion; 405. Positioning groove; 5. Filter component; 501. Second external thread. Detailed Implementation

[0024] like Figures 1 to 6 As shown, this utility model relates to a sampling device for detecting chemical waste gas, including a sampling tube 1 and an internally installed suction rod 2. A sampling head 3 is fixedly installed at the lower end of the sampling tube 1, and a sealing component 4 is fixedly installed inside the sampling tube 1 to block the opening of the sampling head 3. The cooperation between the sampling tube 1 and the suction rod 2 can perform waste gas extraction. The cooperation between the sampling head 3 and the sealing component 4 can maintain an automatic sealing state, making it easy to directly seal the extraction port after extraction, reducing the probability of contact with the outside air.

[0025] The sampling head 3 includes a connecting tube 301, the lower end of which is integrally formed with a connecting tube 302. A corresponding movable groove 304 is provided on the side of the connecting tube 302. The sealing component 4 includes a spring 401, the lower end of which is fixedly fitted with a sealing plate 402 that fits against the top of the inner cavity of the connecting tube 301. The bottom of the sealing plate 402 is integrally formed with two baffles 403 that have two sealing movable grooves 304. Each of the two baffles 403 has a protrusion 404 protruding outwards from the side opposite to the connecting tube 302. The movable grooves 304 facilitate the vertical movement of the protrusions 404, and the baffles 403 are designed to... While achieving the connection effect, it can also achieve the effect of sealing the movable groove 304. Under the support of the spring 401, the sealing plate 402 can achieve the effect of elastic automatic reset, which can easily automatically seal the air extraction port of the sampling head 3. In addition, a groove 308 is also provided at the air extraction port position of the connecting pipe 301, so that the sealing plate 402 is embedded in the groove 308, increasing the contact surface and improving the sealing performance. The spring 401 is installed on the limiting block 101 on the inner wall of the sampling tube 1. The limiting block 101 restricts the installation position of the spring, so that the sealing plate 402 is pressed and adhered to the top inner wall of the connecting pipe 301 by the spring 401.

[0026] In the embodiments of this utility model, the movable groove 304 has an arc-shaped positioning block 305 integrally formed on the opposite side near the bottom, and the protrusion 404 has a positioning groove 405 that engages with the positioning block 305 on its side. The engagement of the positioning block 305 and the positioning groove 405 can further limit the position of the sealing plate 402, so that it maintains a good fit without external force and is not easily affected by vibration and gaps.

[0027] In an embodiment of this utility model, a first external thread 102 is formed on the outer wall of the bottom of the sampling tube 1, and a first threaded groove 303 adapted to connect with the first external thread 102 is formed on the inner wall of the connecting tube 301. The combination of the first external thread 102 and the first threaded groove 303 can facilitate the disassembly of the sampling head 3 and ensure the stability of the connection. When it is necessary to replace or repair the sampling head 3, it can also be easily disassembled by rotating the thread.

[0028] In this embodiment of the present invention, a hemispherical groove 307 is provided on the outer wall of the connecting tube 301, and several anti-slip grooves are also provided vertically on the outer wall of the connecting tube 301. A fixing ring 103 is fixed on the outer wall of the sampling tube 1. An elastic plate 104 close to the groove 307 is fixed at the bottom of the fixing ring 103. A locking block 105 that engages with the groove 307 is fixed on the side of the elastic plate 104. The engagement of the groove 307 and the locking block 105 can further limit the position after the sampling head 3 is tightened, making it less susceptible to loosening due to vibration and maintaining the tightness of the connection. The anti-slip grooves can increase the friction when the sampling head 3 is rotated.

[0029] In an embodiment of this utility model, the lower end of the insertion tube 302 has a second internal thread 306 on its inner wall, and the outer wall of the filter element 5 has a second external thread 501 that is adapted to and connected to the second internal thread 306. The filter element 5 can be easily disassembled and assembled by the combination of the second internal thread 306 and the second external thread 501. The filter element 5 can filter large particulate impurities mixed in the exhaust gas when exhaust gas is extracted, thereby improving the purity of the exhaust gas extraction. The detachable design makes it easy to clean the filter element 5.

[0030] Working Principle: This embodiment provides a sampling device for detecting chemical waste gas. In use, first, the connecting pipe 301 at the lower end of the sampling head 3 is inserted into the waste gas tank opening. After moving a certain distance, the bottom of the protrusion 404 can be aligned with the tank opening. Then, under the downward pressure, the protrusion 404 is squeezed upwards, thereby pushing the sealing plate 402 upwards inside the connecting pipe 301, thus sealing the extraction port. When it is in position, the exhaust gas inside the waste gas tank can be extracted by pulling the extraction rod 2, allowing the exhaust gas to enter the sampling pipe 1 along the sampling head 3. After completing the quantitative extraction, the entire device can be lifted upwards, so that when the protrusion 404 loses its pressure, the exhaust gas can be extracted. The sample head 3 can be pushed back to its original position by the force of the spring 401, or the protrusions 404 on both sides can be pressed down by hand while pulling. Under manual pressure, the positioning grooves 405 on both sides of the protrusion 404 can be engaged with the outside of the positioning block 305, thereby strengthening the limiting effect of the protrusion 404. This allows the sealing plate 402 to re-seal the air extraction port of the sampling head 3, achieving a sealing effect. This combination can block the air extraction port when the sampling head 3 is not removed from the can, thereby reducing the probability of air entering when it is removed, thus improving the purity of the exhaust gas sample and enhancing the accuracy of subsequent exhaust gas detection. The overall structure is simple to use and easy to operate, effectively improving the efficiency of exhaust gas extraction operations.

[0031] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A sampling device for detecting chemical waste gas, characterized in that, It includes a sampling tube (1) and an internally installed suction rod (2). A sampling head (3) is fixedly installed at the lower end of the sampling tube (1), and a sealing component (4) is fixedly installed inside the sampling tube (1) to block the opening of the sampling head (3). The sampling head (3) includes a connecting tube (301), and the lower end of the connecting tube (301) is integrally formed with a communicating insertion tube (302). A corresponding movable groove (304) is provided on the side of the insertion tube (302). The sealing component (4) includes a spring (401), and the lower end of the spring (401) is fixedly provided with a sealing plate (402) that fits against the top of the inner cavity of the connecting tube (301). The bottom of the sealing plate (402) is integrally formed with a baffle (403) having two sealing movable grooves (304). The two baffles (403) are fixedly provided with protrusions (404) protruding outward from the insertion tube (302) on opposite sides.

2. The sampling device for detecting chemical waste gas according to claim 1, characterized in that, The movable groove (304) has an arc-shaped positioning block (305) integrally formed on the opposite side near the bottom, and the protrusion (404) has a positioning groove (405) that engages with the positioning block (305) on its side.

3. The sampling device for detecting chemical waste gas according to claim 1, characterized in that, The sampling tube (1) has a first external thread (102) on its bottom outer wall, and the connecting tube (301) has a first thread groove (303) on its inner wall that is adapted to connect with the first external thread (102).

4. The sampling device for detecting chemical waste gas according to claim 1, characterized in that, The outer wall of the connecting pipe (301) is provided with a hemispherical groove (307), and the outer wall of the connecting pipe (301) is also provided with several anti-slip grooves vertically.

5. The sampling device for detecting chemical waste gas according to claim 4, characterized in that, A fixing ring (103) is fixedly provided on the outer wall of the sampling tube (1). An elastic plate (104) close to the position of the slot (307) is fixedly provided at the bottom of the fixing ring (103). A card block (105) that is engaged with the slot (307) is fixedly provided on the side of the elastic plate (104).

6. The sampling device for detecting chemical waste gas according to claim 1, characterized in that, The lower end of the cannula (302) has a second internal thread (306) on its inner wall, and the outer wall of the filter element (5) has a second external thread (501) that is adapted to and connected to the second internal thread (306).

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