New type of airtight quantitative sampling valve

Abstract

The present invention discloses a novel airtight quantitative sampling valve, comprising: a valve body having a valve body cavity; a sampling connection port for connecting a sampling bottle; a valve body inner core disposed in the valve body cavity, including: a first cavity, which is a horizontally penetrating through-hole connecting a first connection port and a second connection port; a second cavity, which is a vertically penetrating through-hole and communicates with the first cavity, wherein the bottom of the second cavity is provided as a sampling hole, and the first cavity communicates with the sampling bottle through the sampling hole; a sampling valve rod movably disposed in the second cavity. The advantages of the present invention are: compact structure, quantitative sampling, convenient operation, beautiful appearance, capable of realizing on-line sampling, ensuring the timeliness and accuracy of sampling, avoiding the risk of employees directly contacting the material, and avoiding the risk of environmental pollution caused by sampling.

Description

Technical Field

[0001] The invention relates to a sampling device for testing and analysis in the fine chemical industry, and in particular to a novel closed quantitative sampling valve for sampling and analysis in an online production state. Background Art

[0002] At present, in the production of fine chemicals such as petrochemicals, coal chemicals, and pharmaceuticals, in order to ensure the safe and stable operation of the equipment and the quality of the products produced, corresponding process control methods are established in important sections, and the quality analysis of intermediate products is used to determine whether the quality of the obtained products is qualified and whether the chemical equipment is running smoothly. The operation plan can be adjusted in time according to the analysis results and needs. The main process control method is to take out the continuous flow medium in the process pipeline for various analyses to obtain the analysis results of the components.

[0003] At present, many chemical companies still use open sampling methods. For example, a branch pipe is welded on the pipeline where the material flows, and a valve is installed. When sampling, in order to ensure the representativeness and accuracy of the material, the valve is first opened to discharge a part of the material at the blind end of the branch pipe, usually into the ditch. When enough material is discharged, it can be collected with a sampling bottle. Only in this way can the sample obtained be the material that is being produced continuously, which is representative and can represent the true quality of the product. Different sampling operators have different sampling methods, and there are certain deviations in the quality of the products taken. Such open sampling will cause contamination of the sample and deviation in its accuracy, and will also cause health hazards to the samplers and environmental pollution.

[0004] In recent years, with the increasing requirements of the country for safety and environmental protection, open sampling methods will gradually be eliminated, and closed samplers are becoming more and more popular among chemical companies. There are many online closed samplers on the market, but most of them are expensive, ranging from tens of thousands to hundreds of thousands, and the operation is complicated. It is difficult to repair the sampler after a leak, which increases the operating cost and the intensity of maintenance work. Summary of the invention

[0005] The main purpose of the present invention is to provide a sampling valve which is compact, environmentally friendly, easy to operate and can continuously take out the working medium in a closed state, aiming to reduce the operating cost, avoid environmental pollution and personal injury caused by the sampling process, and ensure the accuracy and timeliness of the sampled materials.

[0006] The novel sealed quantitative sampling valve of the present invention includes: a valve body having a valve body cavity, including a first connection port and a second connection port that are connected and are respectively used to connect pipelines; a control device for controlling the opening or closing of the first connection port and / or the second connection port; a sampling connection port provided at the bottom of the valve body for connecting a sampling bottle; a valve body core provided in the valve body cavity, including: a first cavity, which is a horizontally penetrating through hole connecting the first connection port and the second connection port; a second cavity, which is a vertically penetrating through hole and is connected to the first cavity, wherein the bottom of the second cavity is provided as a sampling hole, and the first cavity is connected to the sampling bottle through the sampling hole; a sampling valve rod movably provided in the second cavity, including: a columnar rod; a braking part connected to one end of the columnar rod; a sealing part at the other end of the columnar rod for sealing the sampling hole; in the case of sampling, the braking part drives the columnar rod and the sealing part to move upward so that the sampling hole is opened, and the liquid in the first cavity enters the sampling bottle through the sampling hole.

[0007] In some embodiments, it further includes a quantitative valve core provided in the valve body cavity. The quantitative valve core has a quantitative cavity connected to the sampling hole.

[0008] In some embodiments, a packing part is further provided at the upper part of the valve body core for sealing the upper part of the second cavity. The packing part includes a spring and packing surrounding the columnar rod; and a packing gland for pre-tightening the spring and the packing.

[0009] In some embodiments, the spring is a disc spring; the material of the packing includes: graphite or polytetrafluoroethylene.

[0010] In some embodiments, it further includes a valve cover covering the valve body core and connected and fixed to the valve body for sealing the position where the valve body core switches and moves.

[0011] In some embodiments, the bottom of the valve body further includes a vent port and an exhaust port communicating with the sampling bottle.

[0012] In some embodiments, the sampling hole is a conical opening, and the sealing part is a conical component that can cooperate with the conical opening.

[0013] In some embodiments, the aperture of the conical opening is between 4 mm and 6 mm.

[0014] In some embodiments, the lower end of the columnar rod is a T-shaped ring groove, the sealing part has a T-shaped structure, and the columnar rod and the sealing part are connected through the T-shaped ring groove and the T-shaped structure.

[0015] In some embodiments, the control device is a cock valve structure. Description of the Drawings

[0016] Figure 1 Structural schematic diagram in an embodiment of the present invention;

[0017] Figure 2 Structural schematic diagram of the valve body in an embodiment of the present invention;

[0018] Figure 3 Structural schematic diagram of the valve inner core in an embodiment of the present invention.

[0019] Symbol description in the drawings:

[0020] 10 Valve body;

[0021] 11 First connection port;

[0022] 12 Second connection port;

[0023] 13 Control handle;

[0024] 14 Circumferential positioning groove;

[0025] 15 Cock bushing;

[0026] 16 Quantitative valve core;

[0027] 17 Axial positioning ring;

[0028] 18 Vent port;

[0029] 19 Exhaust port;

[0030] 20 Sampling connection port;

[0031] 30 Valve inner core;

[0032] 31 First cavity;

[0033] 32 Second cavity;

[0034] 33 Sampling hole;

[0035] 34 Sealing sleeve;

[0036] 35 Packing gland;

[0037] 36 Stainless steel sleeve;

[0038] 37 Spring;

[0039] 38 Packing;

[0040] 39 Connecting screw;

[0041] 40 Sampling valve stem;

[0042] 41 Columnar rod;

[0043] 42 Braking part;

[0044] 43 Sealing part;

[0045] 50 Sampling bottle;

[0046] 60 Valve cover;

[0047] 61 Nut;

[0048] 62 Stud;

[0049] 63 Adjusting screw;

[0050] 64 Directional pressure ring;

[0051] 65 Angle ring;

[0052] 66 Sealing ring;

[0053] 67 Teflon gasket;

[0054] 68 Stainless steel gasket. Detailed implementation mode

[0055] The technical features of the present invention are further described below with reference to the accompanying drawings through specific embodiments:

[0056] This embodiment provides a new type of airtight quantitative sampling valve, and its structure is as Figures 1 to 3 shown, including: a valve body 10, a sampling connection port 20, an inner valve body core 30, and a sampling valve rod 40. Among them, the valve body 10 has a valve body cavity, including a first connection port 11 and a second connection port 12 that are connected, and are respectively used to connect pipelines; a control device for controlling the opening or closing of the first connection port 11 and / or the second connection port 12; a sampling connection port 20 provided at the bottom of the valve body 10 for connecting the sampling bottle 50; an inner valve body core 30 provided in the valve body cavity, including: a first cavity 31, which is a horizontally penetrating through-hole connecting the first connection port 11 and the second connection port 12; a second cavity 32, which is a vertically penetrating through-hole and is connected to the first cavity 31. Among them, the bottom of the second cavity 32 is set as a sampling hole 33, and the first cavity 31 is connected to the sampling bottle 50 through the sampling hole 33; a sampling valve rod 40 that can be movably provided in the second cavity 32, including: a columnar rod 41; a braking part 42 connected to one end of the columnar rod 41; a sealing part 43 at the other end of the columnar rod 41 for sealing the sampling hole 33; in the case of sampling, the columnar rod 41 and the sealing part 43 are linked to move upward through the braking part 42, so that the sampling hole 33 is opened, and the liquid in the first cavity 31 enters the sampling bottle 50 from the sampling hole 33.

[0057] In some embodiments, the present invention controls the amount of quantitative sampling by connecting the capacity of the sampling bottle 50. In other embodiments, a quantitative valve core 16 is further included in the valve body cavity of the present invention, and the amount of quantitative sampling is controlled by the quantitative valve core 16. In this embodiment, the control device in the valve body 10 is taken as an example of a cock valve structure for illustration. The control device includes a control handle 13. The interior of the valve body 10 includes a circumferential positioning groove 14 and an axial positioning ring 17 that cooperate with the cock bushing 15 to ensure that the cock bushing 15 does not undergo axial displacement when rotating relative to the valve body 10. A cock valve core is provided inside the valve body cavity. The middle part of the cock valve core is processed into a quantitative flow-through space to form a certain quantitative valve core 16 to ensure the quantification of sampling. Specifically, during implementation, the cock valve core is rotated circumferentially by the control handle 13 to control the opening or closing of the first connection port 11 and the second connection port 12. At the same time, a certain amount of liquid is retained inside the quantitative valve core 16. When the braking part 42 drives the sealing part 43 to open the sampling hole 33, the liquid inside the quantitative valve core 16 enters the sampling bottle 50 through the sampling hole 33. Preferably, the first connection port 11 and the second connection port 12 are set as a flange connection structure, and the valve body 10 is made of 316L stainless steel with good corrosion resistance; preferably, the control handle 13 is made of stainless steel to ensure that it is not easily corroded in a harsh environment.

[0058] It should be noted that in this embodiment, the control device in the valve body 10 is taken as an example of a cock valve structure for illustration, but the present invention is not limited thereto. The structures of other control devices that achieve the same function in the valve body can also be applicable to the present invention.

[0059] In this embodiment, as Figure 3As shown, a packing part is also provided at the upper part of the valve body core 30 for sealing the upper part of the second cavity 32, so as to prevent the liquid in the first cavity 31 from leaking from the upper part of the second cavity 32 due to the up-and-down movement of the columnar rod 41. The packing part includes a spring 37 and a packing 38 surrounding the columnar rod 41. The packing 38 is filled below the spring 37. A stainless steel sleeve 36 for evenly distributing the pre-tightening force is provided above the spring 37. A packing gland 35 is provided above the stainless steel sleeve 36 and is fixedly connected to the valve body core 30 by four connecting screws 39. The packing gland 35 adopts an internal thread structure and cooperates with the columnar rod 41. Preferably, the spring 37 is a disc spring, and the packing 38 is made of graphite or polytetrafluoroethylene. More preferably, the disc springs are placed in an overlapping manner of front side - back side. The disc springs can generate a greater pre-tightening force and a greater axial compensation amount under the action of the packing gland 35, which can ensure a better sealing effect. In this embodiment, the sampling hole 33 is a conical opening, and the sealing part 43 is a conical component that can cooperate with the conical opening. A sealing sleeve 34 is also provided on the inner wall of the sampling hole 33. Preferably, the aperture of the conical opening is between 4 mm and 6 mm.

[0060] In this embodiment, the lower end of the columnar rod 41 is a T-shaped ring groove, and the sealing part 43 has a T-shaped structure. The columnar rod 41 and the sealing part 43 are connected through the T-shaped ring groove and the T-shaped structure, so that the sampling valve rod 40 is easier to process and produce. Preferably, a protective sleeve made of polytetrafluoroethylene is installed on the sealing part 43. Preferably, the braking part 42 of the sampling valve rod 40 is a handwheel. More preferably, the handwheel is a cam-type five-star structure with an embedded stainless steel hub, which is convenient for connecting with the sampling valve rod 24. The operator can hold it properly and conveniently, and it is easy to operate.

[0061] In this embodiment, as Figure 2 shown, a valve cover 60 is further provided above the valve body core 30 and is fixedly connected to the valve body 10 through a nut 61 and a stud 62. The valve cover 60 is fixedly connected to the valve body core 30 through a connection sealing structure. The connection sealing structure includes, from top to bottom: an adjusting screw 63, an orienting pressure ring 64, an angular ring 65, a tetrafluoro pad 67, a stainless steel gasket 68, and a sealing ring 66; a secondary seal is formed through the valve cover 60 to prevent the liquid in the first cavity 31 from leaking between the valve cover 60 and the valve body core 30 due to the rotational movement of the valve body core 30.

[0062] In this embodiment, as Figure 2As shown in the figure, an air vent 18 and an exhaust port 19 communicating with the sampling bottle 50 are also provided at the bottom of the valve body 10. The air vent 18 can be used to connect an inert gas (such as nitrogen), and the exhaust port 19 is connected to an exhaust purification device or a recovery device. The sampling bottle 50 is connected to the sampling connection port 20. An inert gas is introduced into the sampling bottle through the air vent 18 to purge and displace the air in the sampling bottle 50. On the one hand, this can avoid air pollution of the medium liquid inside the valve body cavity caused by sampling, and on the other hand, it is also suitable for avoiding the medium liquid sample obtained from being easily oxidized by air or polluted by the environment.

[0063] Preferably, in the present invention, the sampling bottle 50 is connected to the sampling connection port 20 on the valve body 10 by a threaded structure. The sampling bottle 50 is cylindrical or cuboid-shaped, and the bottle body is made of transparent, high-temperature resistant, and corrosion-resistant glass or plastic.

[0064] When specifically implementing sampling in this embodiment, it includes the steps:

[0065] (1) First, connect the sampling bottle 50 to the sampling connection port 20 on the valve body 10, open the inert gas (such as nitrogen) purge valve, the inert gas enters the sampling bottle 50 through the air vent 18, and close the inert gas purge valve;

[0066] (2) Operate the control handle 13 to the closed valve position, the first connection port 11 and the second connection port 12 are closed, and a quantitative medium liquid is obtained inside the quantitative valve core;

[0067] (3) Slowly rotate the braking part 42 (handwheel), the columnar rod 41 slowly rises, driving the sealing part 43 to open the sampling hole 33. The medium liquid inside the quantitative valve core enters the sampling bottle 50 through the sampling hole 33 under the action of pressure and gravity, and the gas in the sampling bottle 50 leads to the recovery device or the purification device through the exhaust port 19;

[0068] (4) Slowly rotate the braking part 42 (handwheel) in the reverse direction, the columnar rod 41 slowly descends until the sealing part 43 seals the sampling hole 33, operate the control handle 13 to the open valve position, the first connection port 11 and the second connection port 12 are opened, remove the sampling bottle 50, and the sampling is completed.

[0069] The advantages of the present invention are: compact structure, quantitative sampling, convenient operation, beautiful appearance, capable of realizing on-line sampling, ensuring the timeliness and accuracy of sampling, avoiding the risk of employees directly contacting the materials, and avoiding the risk of environmental pollution caused by sampling.

[0070] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A closed quantitative sampling valve, characterized in that, Comprising: A valve body having a valve body cavity, including a first connection port and a second connection port that are connected and are respectively used for connecting pipelines; A sampling connection port is arranged at the bottom of the valve body and is used for connecting a sampling bottle; the bottom of the valve body further includes a ventilation port and an exhaust port that communicate with the sampling bottle, the ventilation port is used for connecting an inert gas, and the exhaust port is connected to an exhaust purification device or a recovery device; A valve body core is arranged in the valve body cavity and includes: a first cavity, which is a horizontally penetrating through-hole and communicates the first connection port and the second connection port; a second cavity, which is a vertically penetrating through-hole and communicates with the first cavity. Wherein, a sampling hole is arranged at the bottom of the second cavity, and the first cavity communicates with the sampling bottle through the sampling hole; A sampling valve rod is movably arranged in the second cavity and includes: a columnar rod; a braking part connected to one end of the columnar rod; a sealing part at the other end of the columnar rod for sealing the sampling hole; in the case of sampling, the columnar rod and the sealing part are driven to move upward through the braking part so that the sampling hole is opened, and the liquid in the first cavity enters the sampling bottle through the sampling hole; A control device, the control device is a plug valve structure and includes a control handle, a plug bushing and a plug valve core. The plug bushing is arranged inside the valve body and is matched with the circumferential positioning groove and the axial positioning ring inside the valve body. The plug valve core is arranged in the valve body cavity and has a quantitative flow-through space in the middle part to form a quantitative valve core. A quantitative cavity communicating with the sampling hole is arranged inside the quantitative valve core to retain a quantitative amount of liquid. The control handle can drive the plug valve core to rotate circumferentially to control the opening or closing of the first connection port and the second connection port. When the control handle is operated to make the plug valve core close the first connection port and the second connection port, a quantitative amount of liquid is obtained in the quantitative cavity, the braking part drives the sealing part to open the sampling hole, and the liquid in the quantitative cavity enters the sampling bottle through the sampling hole.

2. The closed quantitative sampling valve according to claim 1, wherein A packing part is further arranged at the upper part of the valve body core for sealing the upper part of the second cavity. The packing part includes a spring and packing surrounding the columnar rod; and a packing gland for pre-tightening the spring and the packing.

3. The closed quantitative sampling valve according to claim 2, characterized in that, The spring is a disc spring; the material of the packing includes: graphite or polytetrafluoroethylene.

4. The closed quantitative sampling valve according to claim 1, characterized in that, It further includes a valve cover that covers the valve body core and is fixedly connected to the valve body for sealing the position where the valve body core switches and moves.

5. The hermetic quantitative sampling valve according to claim 1, characterized in that, The sampling hole is a conical opening, and the sealing part is a conical part that can cooperate with the conical opening.

6. The hermetic quantitative sampling valve according to claim 5, characterized in that The aperture of the conical opening is between 4 mm and 6 mm.

7. The closed quantitative sampling valve according to claim 1, characterized in that, The lower end of the columnar rod is a T-shaped ring groove, the sealing part has a T-shaped structure, and the columnar rod and the sealing part are connected through the T-shaped ring groove and the T-shaped structure.

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