Online sampling valve

Abstract

The utility model discloses an on-line sampling valve which comprises a valve body, a sleeve, a valve rod and a hand wheel which are vertically arranged are arranged at the upper end of the valve body, a fluid channel and a sampling channel communicated with the fluid channel are arranged in the valve body, and a plunger rod and a plunger head are sequentially connected to the valve rod. The plunger head comprises an elastic cylinder part and a conical part which is integrally connected with the elastic cylinder part and is matched with the sampling channel, two division grooves are formed in the elastic cylinder part and are arranged in a crossed manner, the elastic cylinder part is equally divided into four parts, and a small gap is formed between every two adjacent parts; and therefore, four elastic sheets with elasticity are formed on the elastic cylindrical part. According to the utility model, the division groove is arranged on the elastic cylindrical part of the plunger head, and the four elastic sheets with elasticity are formed at the end part of the elastic cylindrical part, so that the plunger head is elastically connected with the plunger rod under the condition that a pin rod is not needed, the structure is simple, the processing procedure is simplified, and the production cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a sampling valve with a simple structure and a plunger head that is easy to disassemble and assemble. Background Art

[0002] To ensure the quality of chemical products, factories need to conduct sampling and analysis on key production links to determine whether the product quality is stable and reliable. Currently, online sampling is achieved by connecting an online sampling valve with a three-way joint on the delivery pipeline, one of which is connected to an adapter to receive a sampling bottle, and the connection and disconnection of the joint is controlled by the sampling valve.

[0003] To ensure the tightness of the sampling bottle connector, Figure 6 As shown, the prior art usually uses a pin rod 001 to connect the seal to one end of the valve stem of the sampling valve. However, this connection method leads to an increase in parts and components, high cost of use, and also requires opening mounting holes on the seal and the valve stem that match the pin rod, which increases the number of processing steps. Summary of the invention

[0004] In order to overcome the above defects, the utility model provides an online sampling valve, which has a simple structure, concise connecting parts and is easy to install.

[0005] The utility model adopts a technical solution to solve the technical problem as follows: an online sampling valve is provided, comprising a valve body, a vertically arranged sleeve is provided at the upper end of the valve body, a valve stem is provided in the sleeve, a hand wheel for driving the valve stem to rotate around its axis is rotatably connected to the upper end of the sleeve, a horizontally arranged fluid channel is provided in the valve body, a sampling channel connected to the fluid channel is provided at the lower end of the valve body, a plunger rod is provided in the valve body along the vertical direction, the upper end of the plunger rod is transmission-connected to the valve stem, and a plunger head is provided at the lower end;

[0006] The plunger head comprises an elastic cylindrical portion elastically connected to the plunger rod, and a conical portion integrally connected to the elastic cylindrical portion and adapted to the sampling channel, the elastic cylindrical portion is provided with two dividing grooves, the two dividing grooves are cross-arranged, and the elastic cylindrical portion is equally divided into four parts, and a small gap is formed between two adjacent parts, so that four elastic spring pieces are formed on the elastic cylindrical portion;

[0007] Wherein, the hand wheel drives the valve stem to drive the plunger rod to rotate, so that the conical part of the plunger head opens or closes the sampling channel.

[0008] As a further improvement of the utility model, a cylindrical connecting portion is provided between the elastic cylindrical portion and the conical portion of the plunger head, a conical sealing ring is provided on the outer sleeve of the cylindrical connecting portion, and the outer circumferential surfaces of the conical portion and the conical sealing ring form a conical surface that is sealed and abutted against the inner circumferential surface of the sampling channel.

[0009] As a further improvement of the utility model, a first mounting hole and a second mounting hole concentrically arranged with the first mounting hole are recessed in the middle of the lower end of the plunger rod, and the aperture size of the second mounting hole is larger than the aperture size of the first mounting hole, and the elastic cylindrical portion of the plunger head is elastically connected to the first mounting hole; the upper end of the conical sealing ring has a mounting portion sealed and connected to the second mounting hole.

[0010] As a further improvement of the utility model, the plunger rod is detachably connected to the valve stem via a pin, and a plurality of sealing rings sealingly connected to the upper end of the valve body are sleeved on one end of the plunger rod close to the valve stem.

[0011] As a further improvement of the utility model, the valve body is sealedly connected to a sampling adapter at one end close to the sampling channel outlet, the sampling adapter is connected to a sampling bottle, and the sampling adapter is provided with a liquid outlet channel connected to the sampling channel.

[0012] As a further improvement of the utility model, the sampling adapter is also provided with a connecting air channel parallel to the liquid outlet channel and arranged beside the liquid outlet channel, and the valve body is provided with an air inlet channel connected to the connecting air channel and arranged horizontally, and the inlet end of the air inlet channel is detachably connected with a plug.

[0013] As a further improvement of the present invention, the outlet ends of the liquid outlet channel and the communicating air channel both extend into the sampling bottle.

[0014] The beneficial effects of the utility model are:

[0015] 1. By arranging a dividing groove on the elastic cylindrical part of the plunger head, four elastic spring pieces are formed at the end thereof, so that the plunger head and the plunger rod are elastically connected without using a pin rod, which has a simple structure, streamlined processing procedures and low production cost;

[0016] 2. The sampling channel and plunger head are tapered in structure. The sampling flow rate and sampling volume can be controlled by adjusting the position relationship between the sampling channel and the plunger head.

[0017] 3. An air exchange channel connected to the sampling bottle is provided on the valve body to avoid the potential safety hazard caused by the pressure generated by the accumulation of air in the sampling bottle during the sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is an enlarged structural schematic diagram of the plunger head and the conical sealing ring of the utility model;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model in one direction;

[0021] Figure 4 For this utility model Figure 3 A schematic diagram of the enlarged structure at point A;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the utility model in another direction;

[0023] Figure 6 This is a structural schematic diagram of the connection method using a pin rod in the prior art.

[0024] Combined with the attached drawings, the following description is given:

[0025] 1. Valve body; 101. Fluid channel; 102. Sampling channel; 103. Air inlet;

[0026] 2. Sleeve; 201. Valve stem; 3. Handwheel; 4. Plunger rod; 401. First mounting hole; 402. Second mounting hole; 5. Plunger head; 501. Elastic cylindrical portion; 5011. Dividing groove; 5012. Shrapnel; 502. Conical portion; 503. Columnar connecting portion; 6. Conical sealing ring; 601. Mounting portion; 7. Pin shaft; 8. Sealing ring; 9. Sampling adapter; 901. Liquid outlet channel; 902. Connecting airway; 10. Sampling bottle; 11. Plug; 001. Pin rod. DETAILED DESCRIPTION

[0027] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0028] See also Figures 1 to 5 The utility model provides an online sampling valve, including a valve body 1, wherein the two ends of the valve body 1 in the horizontal direction are respectively a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel and the liquid outlet channel are interconnected to form a fluid channel 101, and the upper end of the valve body 1 in the vertical direction is connected with a sleeve 2 through a valve cover, and a valve stem 201 coinciding with its central axis is arranged in the sleeve 2, and a hand wheel 3 is arranged at the upper end of the sleeve 2, and the hand wheel 3 is rotatable relative to the sleeve 2, and at the same time, the center of the hand wheel 3 is fixedly connected to the upper end of the valve stem 201, and when the hand wheel 3 is rotated, the valve stem 201 can be driven to rotate synchronously.

[0029] A center hole is provided in the vertical direction at the junction of the inlet channel and the outlet channel in the valve body 1. The center hole is coaxially arranged with the valve stem 201, and the center hole forms a cylindrical mounting hole at the upper end of the valve body 1, and forms a tapered sampling channel 102 at the lower end of the valve body 1. The sampling channel 102 is connected with the fluid channel 101, that is, the inlet end of the sampling channel 102 is arranged on the fluid channel 101, and the outlet end is arranged at the lower end of the valve body 1, and the aperture size of the inlet end is larger than the aperture size of the outlet end, thereby forming a tapered sampling channel 102. At the same time, the valve body 1 is sealed and connected with a sampling adapter 9 at one end close to the outlet of the sampling channel 102, and the sampling adapter 9 is connected with a sampling bottle 10, and the sampling adapter 9 is provided with a liquid outlet channel 901 connected with the sampling channel 102, so that the medium in the fluid channel 101 can flow into the sampling bottle 10 after passing through the sampling channel 102 and the liquid outlet channel 901, so as to realize online sampling. Among them, the sampling adapter 9 is a prior art and will not be described in detail in this application.

[0030] Furthermore, a plunger rod 4 is provided in the center hole, and the upper end of the plunger rod 4 is detachably connected to the lower end of the valve stem 201 through a pin shaft 7, which facilitates the disassembly, assembly and replacement of the plunger rod 4. At the same time, a sealing ring 8 is sleeved on the plunger rod 4, so that the plunger rod 4 forms a sealed connection with the upper end of the valve body 1, ensuring the sealing effect in the valve body 1. The center of the lower end of the plunger rod 4 is concavely provided with a second mounting hole 402 and a first mounting hole 401 from bottom to top, and the two mounting holes are arranged in a stepped shape, that is, the aperture size of the second mounting hole 402 is larger than the aperture size of the first mounting hole 401.

[0031] Furthermore, in order to control the sampling flow rate and the sampling volume, the lower end of the plunger rod 4 is connected to a plunger head 5, which is formed by connecting an elastic cylindrical portion 501, a cylindrical connecting portion 503 and a conical portion 502 in sequence and integrally formed. Two dividing grooves 5011 are provided on the elastic cylindrical portion 501, and the two dividing grooves 5011 are arranged crosswise to divide the elastic cylindrical portion 501 into four equal parts, and a small gap is formed between two adjacent parts, so that four elastic spring pieces 5012 are formed on the elastic cylindrical portion 501; that is, the plunger head 5 The elastic cylindrical portion 501 thereon is installed in cooperation with the first mounting hole 401 of the plunger rod 4. When the elastic cylindrical portion 501 is installed into the first mounting hole 401 from one end thereof, the four spring pieces 5012 are pressed close to each other, and are reset and stretched after the installation is completed, so that the end of the plunger head 5 is elastically connected to the plunger rod 4, abandoning the existing connection method using the pin rod 001. It has a simple structure and a convenient installation process. There is no need to open a mounting hole matching the pin rod 001 on the plunger rod and the plunger head, thereby saving production and processing costs.

[0032] The hand wheel 3 drives the valve stem 201 to drive the plunger rod 4 to rotate, so that the tapered portion 502 of the plunger head 5 opens or closes the sampling channel 102. In addition, the sampling channel 102 and the plunger head 5 are tapered in structure. When the plunger head 5 is gradually lifted upward to open the sampling channel 102, the gap between the outer circumference of the plunger head 5 and the inner circumference of the sampling channel 102 gradually increases, so that the sampling flow rate gradually increases; on the contrary, it gradually decreases, and then the sampling flow rate and the sampling amount can be controlled by adjusting the positional relationship between the plunger head and the sampling channel according to the sampling requirements.

[0033] Furthermore, in order to ensure the sealing effect between the plunger head 5 and the sampling channel 102 when sampling is not performed, a conical sealing ring 6 is sleeved on the cylindrical connecting portion 503 of the plunger head 5, and the outer circumference of the conical portion 502 of the plunger head 5 and the conical sealing ring 6 just form a conical surface that is sealed against the conical inner circumference of the sampling channel 102. The mounting portion 601 at the upper end of the conical sealing ring 6 is just placed in the second mounting hole 402 and forms a sealing connection with the second mounting hole 402.

[0034] Furthermore, the sampling adapter 9 is also provided with a connecting air channel 902 which is parallel to the liquid outlet channel 901 and arranged beside the liquid outlet channel 901, and the valve body 1 is provided with an air inlet 103 which is connected to the connecting air channel 902 and arranged horizontally, and the inlet end of the air inlet 103 is detachably connected with a plug 11. When sampling, the plug 11 is removed to exchange the air in the sampling bottle 10 with the outside air, thereby preventing the safety hazard caused by the pressure generated by the accumulation of air in the sampling bottle 10 during sampling.

[0035] In summary, the online sampling valve provided by the utility model, by arranging a dividing groove on the elastic cylindrical part of the plunger head, so that the end of the plunger head is formed with four elastic spring pieces, so that the plunger head and the plunger rod are elastically connected without using a pin rod, the structure is simple, the processing steps are streamlined, and the production cost is low; a sampling channel and a plunger head with a conical structure are adopted, and the sampling flow rate and the sampling volume are controlled by adjusting the positional relationship between the sampling channel and the plunger head; an air exchange channel connected to the sampling bottle is arranged on the valve body, so that the pressure generated by the accumulation of air in the sampling bottle during the sampling process is avoided, which may cause safety hazards.

[0036] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An online sampling valve, comprising a valve body (1), a vertically arranged sleeve (2) being provided at the upper end of the valve body (1), a valve stem (201) being provided in the sleeve (2), a hand wheel (3) being rotatably connected to the upper end of the sleeve (2) for driving the valve stem (201) to rotate around its axis, a horizontally arranged fluid channel (101) being provided in the valve body (1), characterized in that: The lower end of the valve body (1) is provided with a sampling channel (102) connected to the fluid channel (101); a plunger rod (4) is arranged in the valve body (1) in a vertical direction; the upper end of the plunger rod (4) is transmission-connected to the valve stem (201), and the lower end is provided with a plunger head (5); The plunger head (5) comprises an elastic cylindrical portion (501) elastically connected to the plunger rod (4), and a conical portion (502) integrally connected to the elastic cylindrical portion (501) and adapted to the sampling channel (102); two dividing grooves (5011) are provided on the elastic cylindrical portion (501), and the two dividing grooves (5011) are cross-arranged to divide the elastic cylindrical portion (501) into four equal parts, and a small gap is formed between two adjacent parts, so that four elastic spring pieces (5012) are formed on the elastic cylindrical portion (501); The hand wheel (3) drives the valve stem (201) to drive the plunger rod (4) to rotate, so that the conical portion (502) of the plunger head (5) opens or closes the sampling channel (102).

2. The online sampling valve according to claim 1, characterized in that: A cylindrical connecting portion (503) is provided between the elastic cylindrical portion (501) and the conical portion (502) of the plunger head (5), and a conical sealing ring (6) is provided on the outer sleeve of the cylindrical connecting portion (503). The outer peripheral surfaces of the conical portion (502) and the conical sealing ring (6) form a conical surface that is sealed against the inner peripheral surface of the sampling channel (102).

3. The online sampling valve according to claim 2, characterized in that: A first mounting hole (401) and a second mounting hole (402) arranged concentrically with the first mounting hole (401) are recessed in the middle of the lower end of the plunger rod (4), and the aperture size of the second mounting hole (402) is larger than the aperture size of the first mounting hole (401); the elastic cylindrical portion (501) of the plunger head (5) is elastically connected to the first mounting hole (401); and the upper end of the conical sealing ring (6) has a mounting portion (601) sealedly connected to the second mounting hole (402).

4. The online sampling valve according to claim 1, characterized in that: The plunger rod (4) is detachably connected to the valve stem (201) via a pin shaft (7); the plunger rod (4) is sleeved with a plurality of sealing rings (8) on one end close to the valve stem (201) and sealed to the upper end of the valve body (1).

5. The online sampling valve according to claim 1, characterized in that: The valve body (1) is sealedly connected to a sampling adapter (9) at one end close to the outlet of the sampling channel (102); a sampling bottle (10) is connected to the sampling adapter (9); and a liquid outlet channel (901) communicating with the sampling channel (102) is provided on the sampling adapter (9).

6. The online sampling valve according to claim 5, characterized in that: The sampling adapter (9) is also provided with a connecting air channel (902) which is parallel to the liquid outlet channel (901) and arranged beside the liquid outlet channel (901); the valve body (1) is provided with an air inlet channel (103) which is connected to the connecting air channel (902) and arranged horizontally; the inlet end of the air inlet channel (103) is detachably connected with a plug (11).

7. The online sampling valve according to claim 6, characterized in that: The outlet ends of the liquid outlet channel (901) and the communicating air channel (902) both extend into the sampling bottle (10).

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