Online sampling device

Abstract

The utility model provides an on-line sampling device which comprises a sampling pipe, a flange and a sampling valve, the flange is connected to a main pipe, the sampling pipe is arranged in the flange and can axially move relative to the flange, a sealing assembly is arranged between the sampling pipe and the flange, and the sampling valve is arranged on the flange. The rear end of the sampling pipe is connected to the inlet end of the sampling valve, when the sampling valve axially moves towards the flange, the front end of the sampling pipe can enter the inner cavity of the main pipe, and when the sampling valve axially moves away from the flange, the front end of the sampling pipe retreats from the inner cavity of the main pipe. The utility model is safe and convenient, effectively protects the sampling pipe, slows down the erosive wear of the sampling pipe, ensures the medium stability of the main pipe, and reduces the maintenance cost of the sampling pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of on-line sampling, in particular to an on-line sampling device. Background Technique

[0002] In the fields of petrochemical, gas, water treatment and electric power, each section of process parameters is different. It is necessary to monitor the pressure and temperature changes in the system in real time and sample and analyze the medium in the pipeline irregularly. The current common sampling method is to add sampling holes on the process main pipe and perform on-line sampling through a sampler. The on-line sampling has high efficiency, can sample in real time, and ensures the accuracy and representativeness of the sample.

[0003] However, the existing on-line samplers often fix the sampling pipe on the main pipe. Since the medium basically has a certain pressure, speed, particulate matter, and even toxic and corrosive properties, etc., the sampling pipe is placed in the main pipe for a long time and is washed by the medium. Over time, the sampling pipe will be worn. On the one hand, it will pollute the medium, and on the other hand, it will increase the maintenance cost of the sampling pipe. Content of the Utility Model

[0004] The purpose of the utility model is to provide an on-line sampling device, which solves the technical problems pointed out in the background technique that the sampling pipe in the existing on-line sampling is easily worn by the medium scouring when staying in the main pipe for a long time, pollutes the medium, and increases the maintenance cost.

[0005] To achieve the above purpose, the utility model provides an on-line sampling device: including a sampling pipe, a flange, and a sampling valve. The flange is connected to the main pipe. The sampling pipe is arranged inside the flange. The sampling pipe can axially move relative to the flange. A sealing component is arranged between the sampling pipe and the flange. The rear end of the sampling pipe is connected to the inlet end of the sampling valve. When the sampling valve axially moves towards the flange, the front end of the sampling pipe can enter the inner cavity of the main pipe. When the sampling valve axially moves away from the flange, the front end of the sampling pipe withdraws from the inner cavity of the main pipe.

[0006] Preferably, a limiting shoulder is arranged inside the flange. A limiting sleeve is arranged at the front end of the sampling pipe. The front end of the sampling pipe can axially move between the limiting shoulder and the inner cavity of the main pipe.

[0007] Preferably, the sealing component includes a packing pad, packing, and a packing gland. The packing gland is connected to the flange and holds the packing between the sampling pipe and the flange.

[0008] Preferably, a first guiding ring and a second guiding ring are respectively arranged inside the packing gland. The first guiding ring is arranged on one side adjacent to the packing pad, and the second guiding ring is arranged on the side far from the packing pad.

[0009] Preferably, a locking nut is provided on the stuffing gland.

[0010] Preferably, a spiral wound gasket is provided inside the flange.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: when sampling, the sampling pipe is inserted into the main pipe. After sampling is completed, the sampling pipe is retracted into the sampling device, avoiding the sampling pipe staying in the main pipe and being scoured by the medium in the main pipe. The present utility model is safe and convenient, effectively protects the sampling pipe, slows down the erosion and wear of the sampling pipe, ensures the stability of the medium in the main pipe, and reduces the maintenance cost of the sampling pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure shows a schematic structural diagram of the present utility model;

[0013] In the figure, 1. Sampling pipe; 2. Flange; 3. Packing gasket; 4. Packing; 5. First guide ring; 6. Locking nut; 7. Stuffing gland; 8. Second guide ring; 9. Sampling valve; 10. Limit sleeve; 11. Main pipe; 12. Branch pipe; 13. Bolt and nut; 14. Spiral wound gasket; 15. Limit shoulder; 16. Front end; 17. Rear end; 18. Inlet end. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0016] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0017] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0018] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0019] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0020] The following will describe in detail some embodiments of the present utility model with reference to the drawings.

[0021] As shown in the Figure 1 drawings, an on-line sampling device according to the present utility model includes a sampling tube 1, a flange 2, and a sampling valve 9. The flange 2 is composed of two parts with substantially the same structure and is connected together by bolts and nuts 13. Preferably, a winding gasket 14 is arranged in the flange 2 in the radial direction, and the winding gasket 14 can provide effective sealing between the flange contact surfaces. One end of the flange 2 is welded to the branch pipe 12, and the branch pipe 12 is perpendicularly welded to the outer wall of the main pipe 11. Channels communicating with the inner cavity of the main pipe 11 are arranged inside the branch pipe 12 and the flange 2. The sampling tube 1 is arranged inside the flange 2. The front end 16 of the sampling tube 1 is arranged in a needle tip shape, and the rear end 17 extends out of the flange 2 and is connected to the inlet end 18 of the sampling valve 9. The sampling tube 1 can move axially relative to the flange 2, and a sealing assembly is arranged between the sampling tube 1 and the flange 2. When the sampling valve 9 moves axially towards the flange 2, the front end 16 of the sampling tube 1 gradually enters the inner cavity of the main pipe 11; when the sampling valve 9 moves axially away from the flange 2, the front end 16 of the sampling tube 1 retracts from the inner cavity of the main pipe 11.

[0022] A limiting shoulder 15 may be provided in the flange 2, and a limiting sleeve 10 may be provided on the front end 16 of the sampling tube 1. When the sampling tube 1 moves until the limiting sleeve 10 abuts against the limiting shoulder 15, the sampling tube 1 cannot continue to move axially. The limiting sleeve 10 and the limiting shoulder 15 are used to limit the moving stroke of the sampling tube 1 to prevent the sampling tube 1 from being separated from the flange 2.

[0023] The sealing assembly provides necessary sealing for the sampling tube 1 and the flange 2 during the axial movement of the sampling tube 1. In a preferred solution, the sealing assembly includes a packing pad 3, a packing 4, and a packing gland 7. The packing gland 7 is threadedly connected to the other end of the flange 2 to press the packing pad 3 and the packing 4 between the sampling tube 1 and the flange 2. The packing 4 can be made of a self-lubricating material such as PTFE or graphite. During the tightening period, the packing gland 7 gives the packing 4 a pre-tightening force so that the packing 4 hugs the outer wall of the sampling tube 1 to ensure the sealing of the sampling tube 1 during the plugging and unplugging process. The packing pad 3 plays a certain guiding role. Furthermore, a first guide ring 5 and a second guide ring 8 can also be arranged in the packing gland 7. The first guide ring 5 is arranged on the side adjacent to the packing pad 3, and the second guide ring 8 is arranged on the side away from the packing pad 3. The first guide ring 5 and the second guide ring 8 are preferably made of non-metallic material. The non-metallic guide ring will not damage the sampling tube 1. At the same time, it has a certain lubricity and ensures that the sampling tube 1 moves linearly on the same horizontal center line together with the packing 3. A locking nut 6 can also be provided on the packing gland 7. After the seasoning gland 7 is tightened on the flange 2, the locking nut 6 can be rotated until its end contacts the end surface of the flange 2. The locking nut 6 can prevent the packing gland 7 from loosening, further ensuring the sealing of the packing 4.

[0024] The working principle of the utility model is as follows: close the sampling valve 9, and axially move the orientation valve 9 toward the flange 2, so that the inlet end of the sampling valve 9 is close to the flange 2. Open the sampling valve 9, and the medium in the main pipe 11 enters through the sampling pipe 1 and flows out through the outlet of the sampling valve 9. After the sampling is completed, close the sampling valve 9, and axially move the sampling valve 9 away from the flange 2, so that the front end 16 of the sampling pipe 1 is withdrawn from the main pipe 11.

[0025] The sampling valve 9 is in a closed state by default, including but not limited to a needle valve, a ball valve and the like. The needle valve has a certain flow rate regulation capability, and the ball valve has a fast sampling capability. The appropriate valve type can be selected according to actual needs.

[0026] The basic principles and advantages of the present utility model have been described above. For those skilled in the art, the above embodiments are only used to illustrate the technical solution of the present utility model, rather than to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, after reading this specification, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features therein. Without departing from the concept of the present utility model, any obvious replacement is within the protection scope of the present utility model.

Claims

1. An on-line sampling device, characterized in that, It includes a sampling pipe (1), a flange (2), and a sampling valve (9). The flange (2) is connected to the main pipe (11). The sampling pipe (1) is arranged inside the flange (2). The sampling pipe (1) can axially move relative to the flange (2). A sealing assembly is arranged between the sampling pipe (1) and the flange (2). The rear end of the sampling pipe (1) is connected to the inlet end of the sampling valve (9). When the sampling valve (9) axially moves towards the flange (2), the front end of the sampling pipe (1) can enter the inner cavity of the main pipe (11). When the sampling valve (9) axially moves away from the flange (2), the front end of the sampling pipe (1) withdraws from the inner cavity of the main pipe (11).

2. The on-line sampling device according to claim 1, characterized in that, A limiting shoulder (15) is arranged inside the flange (2). A limiting sleeve (10) is arranged at the front end of the sampling pipe (1). The front end of the sampling pipe (1) can axially move between the limiting shoulder (15) and the inner cavity of the main pipe (11).

3. An on-line sampling device according to claim 2, characterized in that, The sealing assembly includes a packing gasket (3), packing (4), and a packing gland (7). The packing gland (7) is connected to the flange (2) and holds the packing (4) between the sampling pipe (1) and the flange (2).

4. An on-line sampling device according to claim 3, characterized in that, A first guide ring (5) and a second guide ring (8) are respectively arranged inside the packing gland (7). The first guide ring (5) is arranged on the side adjacent to the packing gasket (3), and the second guide ring (8) is arranged on the side away from the packing gasket (3).

5. An on-line sampling device according to claim 4, characterized in that, A locking nut (6) is arranged on the packing gland (7).

6. An on-line sampling device according to any one of claims 1-5, characterized in that, A spiral wound gasket (14) is arranged inside the flange (2).

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