Normal-pressure sealed sampling device

Abstract

The normal-pressure sealed sampling device comprises a first sampling pipe, a second sampling pipe, a first blocking valve, a second blocking valve and a conveying pipe, a third sampling pipe is arranged in the middle of the conveying pipe, one end of the third sampling pipe is communicated with the conveying pipe, and the other end of the third sampling pipe is connected with the upper portion of the first sampling pipe through the first blocking valve; the second blocking valve is connected with the lower part of the first sampling tube; the rubber block is plugged at the end part of the second sampling tube, the end cover is mounted at the end part of the second sampling tube through threads, and a plurality of sampling holes are formed in the end cover. The end of the second sampling tube is sealed through the rubber block, air can be prevented from entering the sampling tubes and an injector during sampling, normal operation of equipment is guaranteed, samples are protected against pollution, the multiple sampling holes are formed in the end cover, sampling personnel can conveniently pierce the rubber block regionally, it is avoided that the sampling personnel pierce the rubber block many times in the same region, and sampling efficiency is improved. The service life of the rubber block is prolonged, and the sampled sample is not easily polluted by air.

Description

Technical Field

[0001] The present application relates to the technical field of fine chemical product detection, and in particular to a normal pressure sealed sampling device. Background Art

[0002] At present, in the fine chemical industry, some ultra-high-purity synthetic compounds (purity of 99.999% or more) that are easily oxidized and deteriorate by air and have extremely strict requirements on moisture content will cause oxidation and deterioration of the product if air is leaked into the synthesis and purification process. Moreover, the leaked air will cause ultra-high moisture content, leading to oxidative polymerization and quality problems of the product. Therefore, the synthesis and purification process is carried out in closed pipelines and containers. During the product production process, regular sampling is required. Conventional sampling methods easily lead to air entering the pipeline. Therefore, some closed sampling devices have been designed. For example, Chinese patent application number 201611167791.2 discloses a water cooler sampling device and sampling method. The sampling device includes a sampling pipe connected to the return water section of the water cooler and a syringe sampler that can be inserted into the sampling pipe to sample the cooling water of the return water section. The sampling pipe is arranged at the bottom end of the return water section. The sampling method includes the following steps: inserting a syringe sampler into a sampling pipe, allowing the sampling needle of the syringe sampler to contact the cooling water in the return water section; after sampling is completed, pulling out the syringe sampler. When the device is sampling, the needle needs to be inserted into the elastic sealing rubber pad. After multiple passes, the same position on the elastic sealing rubber pad is pierced multiple times, which will cause the sealing effect to decrease. Frequent sampling requires replacement every 5 to 7 days. If the replacement is not timely, it is easy to cause air to be introduced during sampling, affecting the test results. Therefore, a normal pressure sealing sampling device is needed, which has multiple holes on the end cover to facilitate the sampling personnel to pierce the rubber block in different areas, avoid piercing the same area multiple times, extend the service life of the rubber block, and ensure that the sampled sample is not easily contaminated by the air. Utility Model Content

[0003] In order to solve the above problems, the present application proposes a normal pressure sealed sampling device, which is provided with multiple holes on the end cover to facilitate the sampling personnel to pierce the rubber block in different areas, avoid piercing the same area multiple times, extend the service life of the rubber block, and ensure that the sampled samples are not easily contaminated by the air.

[0004] This application is achieved through the following technical solutions:

[0005] The present application proposes a normal pressure sealed sampling device, comprising: a first sampling tube, a second sampling tube, a first blocking valve, a second blocking valve, and a delivery tube, wherein a third sampling tube is provided in the middle of the delivery tube, one end of the third sampling tube is connected to the delivery tube, the other end of the third sampling tube is connected to the upper part of the first sampling tube through the first blocking valve, and the second blocking valve is connected to the lower part of the first sampling tube; the second sampling tube is connected to the middle of the first sampling tube, a rubber block and an end cover are provided at the end of the second sampling tube, the rubber block is plugged at the end of the second sampling tube, the end cover is installed at the end of the second sampling tube by threads, and a plurality of sampling holes are provided on the end cover.

[0006] Furthermore, a syringe is included, wherein a needle is provided at the end of the syringe, and the needle pierces the rubber block from the sampling hole and extends into the second sampling tube.

[0007] Furthermore, the end portion of the second sampling tube is in a trumpet shape that is larger on the outside and smaller on the inside, and the rubber block fits in contact with the inner wall of the end portion of the second sampling tube.

[0008] Furthermore, a circle of protrusions is provided on the inner wall of the end portion of the second sampling tube.

[0009] Furthermore, there are 7 to 10 sampling holes, which are evenly distributed on the end cover.

[0010] Furthermore, both ends of the first blocking valve are connected to the third sampling tube and the first sampling tube through flanges, and the flanges are connected to each other through clamps.

[0011] Furthermore, one side of the flange is an inclined surface, the clamp is squeezed on the inclined surface, and a sealing ring is provided between the flanges.

[0012] The beneficial effects of the present application are as follows: the end of the second sampling tube is sealed by the rubber block, which can prevent air from entering the sampling tube and the syringe during sampling, ensuring the normal operation of the equipment and protecting the sample from contamination. A plurality of sampling holes are provided on the end cover, which facilitates the sampling personnel to pierce the rubber block in different areas, avoiding multiple piercings in the same area, extending the service life of the rubber block, and ensuring that the sampled sample is not easily contaminated by the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a schematic structural diagram of the second sampling tube of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the flange of the utility model;

[0016] Figure 4 This is a schematic structural diagram of the end cover of the utility model;

[0017] In the figure: 1-first sampling tube, 2-second sampling tube, 3-first blocking valve, 4-second blocking valve, 5-delivery tube, 6-third sampling tube, 7-rubber block, 8-end cover, 9-sampling hole, 10-syringe, 11-needle, 12-protrusion, 13-flange, 14-clamp. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0021] like Figures 1 to 4 As shown, an embodiment of the present invention provides a normal pressure sealed sampling device, including: a first sampling tube 1, a second sampling tube 2, a first blocking valve 3, a second blocking valve 4, and a delivery tube 5. A third sampling tube 6 is provided in the middle of the delivery tube 5, one end of the third sampling tube 6 is connected to the delivery tube 5, and the other end of the third sampling tube 6 is connected to the upper part of the first sampling tube 1 through the first blocking valve 3, and the second blocking valve 4 is connected to the lower part of the first sampling tube 1; the second sampling tube 2 is connected to the middle part of the first sampling tube 1, and a rubber block 7 and an end cover 8 are provided at the end of the second sampling tube 2. The rubber block 7 is plugged in the end of the second sampling tube 2, and the end cover 8 is installed at the end of the second sampling tube 2 by threads, and a plurality of sampling holes 9 are provided on the end cover 8.

[0022] For example, when sampling ultra-high purity products, first open the first blocking valve 3 and the second blocking valve 4, so that the ultra-high purity product in the delivery tube 5 is discharged from the lower part of the second blocking valve 4, thereby emptying the air in the first sampling tube 1, the second sampling tube 2, and the third sampling tube 6. After the air is emptied, close the second blocking valve 4, and then use the needle 11 of the syringe 10 to pierce the rubber block 7 and extend into the second sampling tube 2. After pulling the piston rod of the syringe 10, the VC product in the second sampling tube 2 can be extracted. After taking out a specified amount of ultra-high purity product, the needle 11 is pulled out from the rubber block 7. At this time, the rubber block 7 will seal the pierced position by itself under the action of the extrusion force to prevent air from entering the second sampling tube 2. At the same time, due to the small inner diameter of the needle 11, air is not easy to enter the syringe 10 from the needle 11, avoiding contamination of the sample in the syringe 10 and ensuring the test results. When sampling again, open the first blocking valve 3 and the second blocking valve 4 to allow the new product in the delivery tube 5 to flow into the sampling tube and then collect it.

[0023] There are multiple sampling holes 9 on the end cover 8. The sampler can insert the needle into different sampling holes 9. Compared with the random insertion of the sampler, the sampler inserts the needle into different sampling holes 9 in an orderly manner, which can effectively reduce the probability of multiple punctures at the same position, and ensure that the rubber block 7 can seal itself after the needle 11 is pulled out, thereby extending the service life of the rubber block 7 by 2-3 times.

[0024] When replacing the rubber block 7, close the first blocking valve 3 and open the second blocking valve 4, empty the sampling tube, then unscrew the end cover 8 with a wrench, replace the new rubber block 7, and screw back the end cover 8 to complete the replacement.

[0025] In a preferred embodiment, a syringe 10 is further included. A needle 11 is provided at the end of the syringe 10. The needle 11 pierces the rubber block 7 from the sampling hole 9 and extends into the second sampling tube 2. The sample to be tested can be extracted through the syringe 10. The inner diameter of the needle 11 is small, so air is not easy to enter the syringe 10 through the needle 11, thereby preventing the sample from being contaminated.

[0026] Specifically, if Figure 2 As shown, the end of the second sampling tube 2 is trumpet-shaped with a larger outside and a smaller inside. The rubber block 7 fits against the inner wall of the end of the second sampling tube 2. After tightening the end cap 8, the end cap 8 presses the rubber block 7 to move into the second sampling tube 2, causing the rubber block 7 to be compressed and deformed. After the needle 11 pierces the rubber block 7, the needle 11 is pulled out. The mutual squeezing of the rubber blocks 7 can block the micropores formed by the needle 11, thereby preventing air from entering the sampling tube.

[0027] Preferably, a circle of protrusions 12 is provided on the inner wall of the end of the second sampling tube 2 , which can further compress the outer wall of the rubber block 7 to prevent air from entering the second sampling tube 2 through the gap between the rubber block 7 and the second sampling tube 2 .

[0028] In a specific embodiment, Figure 4 As shown, there are 7 to 10 sampling holes 9, and the sampling holes 9 are evenly distributed on the end cover 8. Under normal circumstances, the micropores formed by the sealing needle 11 can be sealed by mutual squeezing inside the rubber block 7. However, when a position is punctured multiple times, the micropores are connected to each other to form a large hole, resulting in sealing failure. Compared with the random puncture by the sampler, the sampler punctures different sampling holes 9 in an orderly manner, reducing the probability of multiple punctures at the same position, ensuring that the rubber block 7 can seal itself after the needle 11 is pulled out, and extending the service life of the rubber block 7 by 2-3 times.

[0029] Preferably, both ends of the first blocking valve 3 are connected to the third sampling tube 6 and the first sampling tube 1 through flanges 13, and the flanges 13 are connected to each other through clamps 14, which facilitates the overall replacement of the first sampling tube 1 and the first blocking valve 3 and improves maintenance efficiency.

[0030] In a preferred embodiment, Figure 3 As shown, one side of the flange 13 is an inclined surface, and the clamp 14 is squeezed on the inclined surface. A sealing ring is provided between the flanges 13. When the clamp 14 squeezes the inclined surface, the two flanges 13 can be clamped closer, and under the action of the sealing ring, the first blocking valve 3 and the first sampling tube 1 and the first blocking valve 3 and the second sampling tube 2 are sealed.

[0031] Of course, the present application may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present application.

Claims

1. A normal pressure sealed sampling device, characterized in that: include: A first sampling tube (1), a second sampling tube (2), a first blocking valve (3), a second blocking valve (4), and a delivery tube (5); a third sampling tube (6) is provided in the middle of the delivery tube (5); one end of the third sampling tube (6) is communicated with the delivery tube (5); the other end of the third sampling tube (6) is connected to the upper part of the first sampling tube (1) through the first blocking valve (3); and the second blocking valve (4) is connected to the lower part of the first sampling tube (1); the second sampling tube (2) is connected to the middle part of the first sampling tube (1); a rubber block (7) and an end cap (8) are provided at the end of the second sampling tube (2); the rubber block (7) is plugged at the end of the second sampling tube (2); the end cap (8) is installed at the end of the second sampling tube (2) through a thread; and a plurality of sampling holes (9) are provided on the end cap (8).

2. The atmospheric pressure sealed sampling device according to claim 1, characterized in that: It also comprises a syringe (10), the end of which is provided with a needle (11), and the needle (11) pierces the rubber block (7) from the sampling hole (9) and extends into the second sampling tube (2).

3. The atmospheric pressure sealed sampling device according to claim 1, characterized in that: The end of the second sampling tube (2) is in a trumpet shape with a larger outer portion and a smaller inner portion, and the rubber block (7) is in contact with the inner wall of the end of the second sampling tube (2).

4. The atmospheric pressure sealed sampling device according to claim 1, characterized in that: The inner wall of the end portion of the second sampling tube (2) is provided with a circle of protrusions (12).

5. The atmospheric pressure sealed sampling device according to claim 1, characterized in that: There are 7 to 10 sampling holes (9), and the sampling holes (9) are evenly distributed on the end cover (8).

6. The atmospheric pressure sealed sampling device according to claim 1, characterized in that: Both ends of the first blocking valve (3) are connected to the third sampling tube (6) and the first sampling tube (1) through flanges (13), and the flanges (13) are connected to each other through a clamp (14).

7. The atmospheric pressure sealed sampling device according to claim 6, characterized in that: One side of the flange (13) is an inclined surface, the clamp (14) is pressed on the inclined surface, and a sealing ring is provided between the flanges (13).

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