A gas-tight sampling device

Abstract

The present application discloses a gas-tight sampling device, which belongs to the field of gas sampling technology, and includes a sampling joint, a sleeve, a sampling bottle, an operating rod, a connecting structure, a blocking plate, a reinforcement structure, an opening and closing structure, and a triggering structure. The opening end of the sleeve is detachably connected to the sampling joint through a connecting structure, the blocking plate is used to block the sampling joint, and the reinforcement structure is used to fix the blocking plate and the sampling joint; the sampling bottle has a coaxially arranged annular partition, and an annular piston body slides in the piston cavity; the operating rod is used to release the fixing of the blocking plate by the reinforcement structure through the opening and closing structure, and the operating rod is used to drive each piston body to slide in turn through the triggering structure. The present application can realize sampling of the sampling bottle directly in the production environment, while taking into account the airtightness of the production environment before and after sampling, thereby improving the accuracy of sampling detection.

Description

Technical Field

[0001] The present application belongs to the technical field of gas sampling and relates to a closed gas sampling device. Background Art

[0002] In the production process of polysilicon, petrochemicals, pharmaceuticals and other products, easily dissipated and toxic gases are often produced. In order to detect these gases, they need to be sampled in a closed manner.

[0003] The existing gas-tight sampling device includes a sampling tube, a valve and a sampling bottle, wherein the sampling tube is connected to the production environment, which may be a production tank, a production cabin, a production pipeline, etc., that is, toxic gas will be produced in the production environment. When sampling, the valve is opened, and the toxic gas enters the sampling bottle through the sampling tube, and then the sampling bottle is removed for detection.

[0004] However, there is often residual gas in the sampling tube. During the sampling process, the sampling bottle will receive the previous gas, which will cause errors in the sampling. Summary of the invention

[0005] Aiming at the problem of error in existing sampling, a gas-tight sampling device is provided.

[0006] The present application provides a gas-tight sampling device, which is specifically implemented by the following technical solutions:

[0007] A gas-tight sampling device comprises a sampling joint, a sleeve, a sampling bottle, an operating rod, a connecting structure, a blocking plate, a reinforcement structure, an opening and closing structure and a trigger structure, wherein the sampling joint is used to communicate with a production environment, one end of the sleeve has an opening, and the other end of the sleeve is closed, the open end of the sleeve is detachably connected to the sampling joint through a connecting structure, the blocking plate is used to block the sampling joint, and the reinforcement structure is used to fix the blocking plate to the sampling joint; the sampling bottle is axially slidingly connected to the inner wall of the sleeve, one end of the sampling bottle has an opening, and the other end of the sampling bottle is closed, A sleeve is fixed at the axis of the bottle, and an operating rod is located in the sleeve. The sampling bottle has a coaxially arranged annular baffle, which forms an annular piston cavity with the inner circumference of the sampling bottle and the outer circumference of the sleeve respectively, and an annular piston body slides in the piston cavity; the closed end of the sampling bottle is provided with a one-way air inlet valve and a one-way air outlet valve corresponding to the piston cavity; the operating rod is passed through the closed end of the sleeve, and the operating rod is rotatably connected to the sleeve and axially slidably connected; the operating rod is used to release the fixation of the reinforcement structure to the blocking plate through the opening and closing structure, and the operating rod is used to drive each piston body to slide in turn through the trigger structure.

[0008] Through the above technical solution, when no sampling is performed, the sealing plate is sealed to the sampling joint, and the reinforcement structure fixes the sealing plate and the sampling joint to ensure the sealing of the sampling joint, thereby preventing the leakage of toxic gases in the production environment.

[0009] When sampling, the sleeve is fixed to the sampling joint through the connecting structure, and then the operating rod slides. The operating rod releases the fixation of the sealing plate by the reinforcement structure through the opening and closing structure, so that the sealing plate leaves the sampling joint. The operating rod slides again to move the sampling bottle through the sampling joint to the production environment, and then the operating rod drives each piston body to slide in turn through the trigger structure, and the piston cavity generates negative pressure. The gas in the production environment directly enters the piston cavity through the one-way air inlet valve. The setting of multiple piston cavities can sample gases in different time periods, thereby improving the sampling accuracy.

[0010] After sampling is completed, the operating rod retracts the sampling bottle into the sleeve, and then the operating rod fixes the sealing plate to the reinforcement structure through the opening and closing structure to achieve the sealing of the sampling joint, and then releases the connection between the sleeve and the sampling joint, moves the sleeve and the sampling bottle to the detection station, and pushes the piston body when releasing the gas for detection to discharge the gas in the piston cavity through the one-way air outlet valve.

[0011] By setting up the sampling joint, sleeve, operating rod, opening and closing structure, reinforcement structure, sampling bottle, and trigger structure, the sampling bottle can be directly sampled in the production environment, while taking into account the airtightness of the production environment before and after sampling, thereby improving the accuracy of sampling detection. In addition, the sampling bottle is flexible to move and can be moved to multiple sampling points for sampling, greatly enhancing the scope of application.

[0012] Optionally, a sealing ring is coaxially fixed to the inner wall of the outlet end of the sampling connector, the sealing plate is circular, and the outer diameter of the sealing plate is larger than the inner diameter of the sealing ring; the opening and closing structure comprises a square block and a first magnetic block, the square block is fixed to the closed end of the sampling bottle, a square hole is provided in the middle of the end face of the sealing plate for axial insertion of the square block, the first magnetic block is embedded in the inner wall of the square hole, the first magnetic block is magnetically connected to the square block, a convex block is fixed to the outer peripheral surface of the operating rod, a first annular groove is coaxially provided in the inner cavity of the sleeve, and the first annular groove is The groove walls on both sides are respectively provided with a first slot and a second slot; the reinforcement structure comprises a plurality of spring pieces, one end of which is fixed to the sealing plate, and the other end of which is set as an abutting end; a notch is provided at the inner diameter of the sealing ring for the abutting end of the spring piece to pass axially; an arc-shaped guide block is integrally formed on the end face of the sealing ring away from the sealing plate, and the thickness of the guide block gradually increases along the circumference of the sealing ring; the guide block is provided with a bayonet, and the inner wall of the bayonet is provided with an inclined surface; when the sampling joint needs to be opened, the abutting end of the spring piece is located in the bayonet, and the convex block is located in the bayonet. In the first slot, the operating rod moves axially in the direction toward the sampling joint to drive the sampling bottle close to the sealing plate, so that the square block cooperates with the square hole, and the operating rod is rotated in the opposite direction. The operating rod drives the sealing plate to rotate in the opposite direction relative to the sealing ring through the sampling bottle, and the abutting end of the spring piece moves in sequence through the inclined surface of the bayonet and the surface of the guide block to be located at the notch. The operating rod moves axially in the direction toward the sampling joint to bring the sealing plate away from the sealing ring, and the sampling bottle moves into the production environment with the operating rod; when the sampling joint needs to be sealed, the operating rod The rod moves axially in the direction away from the sampling joint, and the protrusion moves from the first slot to the second slot. The operating rod continues to move axially in the direction away from the sampling joint. The operating rod drives the sealing plate to move in the direction toward the sealing ring by driving the sampling bottle. The spring plate on the sealing plate moves to the side of the sealing ring away from the sealing plate through the notch. The operating rod is rotated forward, and the operating rod drives the sealing plate to rotate forward relative to the sealing ring through the sampling bottle. The abutting end of the spring plate moves along the surface of the guide block into the bayonet. During the forward movement of the spring plate, the elastic force of the spring plate gradually increases.

[0013] Through the above technical solution, by setting the coordination of the spring piece, the guide block and the sealing ring, when the plugging plate is opened, the operating rod drives the plugging plate to rotate, so that the spring piece is separated from the guide block, and the operating rod can also drive the sampling bottle forward to go deep into the production environment for easy sampling. When the sampling joint needs to be sealed, the operating rod drives the plugging plate to rotate, and the abutting end of the spring piece moves along the surface of the guide block to the bayonet, and during the forward movement of the spring piece, the elastic force of the spring piece gradually increases, and the elastic force of the spring piece makes the abutting cooperation between the plugging plate and the sealing ring tighter, thereby ensuring the sealing performance.

[0014] Optionally, the outer edge of the sealing plate is set as a tapered portion, one end face of the sealing ring is provided with a tapered surface matching with the outer peripheral surface of the tapered portion, and the tapered surface is provided with a rubber pad.

[0015] Through the above technical solution, the contact sealing area is increased by the cooperation between the tapered portion and the tapered surface.

[0016] Optionally, an escape groove connected to the first annular groove is formed at one end of the sleeve away from the sampling connector.

[0017] Through the above technical solution, it is easy to disengage the operating rod from the sleeve, so that the sampling bottle can be taken out from the sleeve, and the sleeve and the sampling bottle can be cleaned conveniently.

[0018] Optionally, the piston chamber is set to two, and the trigger structure includes a connecting rod and a driving plate, the connecting rod is fixedly connected to the piston body, and the end of the connecting rod is fixed with a trigger rod extending radially toward the axis of the sampling bottle, and an offset angle is provided between the trigger rods of two adjacent piston bodies; the driving plate is fixed to the operating rod; the inner cavity of the sleeve is coaxially provided with a second annular groove, and the second annular groove is far away from the sampling connector relative to the first annular groove, and the inner cavity of the sleeve is also provided with a first groove and a second groove, and the value of the circumferential angle between the first groove and the second groove is the value of the offset angle, and the two ends of the first groove and the second groove are respectively connected to the first annular groove and the second annular groove; the sleeve is provided with a limiting structure, and the limiting structure is used to limit the relative position between the sampling bottle and the sleeve; when the sampling bottle moves into the production environment with the operating rod, the limiting structure limits the The relative position between the sampling bottle and the sleeve, the operating rod moves axially relative to the sampling bottle in the direction away from the sampling connector, and the protrusion moves from the first annular groove through the first groove to the second annular groove. During this period, the driving piece of the operating rod abuts against the trigger rod and drives the piston body to move in the direction away from the closed end of the sampling bottle to complete the air intake of the first piston chamber; when it is necessary to intake air to the second piston chamber, the operating rod is moved axially, the protrusion moves from the second annular groove through the first groove to the first annular groove, the operating rod is rotated, the protrusion moves to the position corresponding to the second groove, and the driving piece of the operating rod moves to one side of the trigger rod of the other piston body, the operating rod is moved axially, the protrusion moves from the first annular groove through the second groove to the second annular groove. During this period, the driving piece of the operating rod abuts against the other trigger rod and drives the corresponding piston body to move in the direction away from the closed end of the sampling bottle to complete the air intake of the second piston chamber.

[0019] Through the above technical solution, the movement of each piston body is realized by setting a driving plate and a plurality of trigger rods in sequence, thereby completing the suction sampling, and the setting of a plurality of ring grooves and a plurality of strip grooves is used to move the protrusion of the operating rod to avoid the rotation and sliding of the operating rod from interfering with the sleeve.

[0020] Optionally, the limiting structure includes an electromagnet, a spring and a limiting block, the inner wall of the sleeve is provided with a receiving groove, the electromagnet is located at the bottom of the receiving groove, the limiting block is slidably connected to the receiving groove, the outer peripheral surface of the sampling bottle is provided with a limiting groove, the spring is used to force the limiting block to be inserted into the limiting groove, and the magnetic force of the electromagnet is used to drive the limiting block to slide out of the limiting groove.

[0021] Through the above technical solution, when the position of the sampling bottle needs to be limited, the elastic force of the spring forces the limit block to slide into the limit groove to achieve fixation between the sleeve and the sampling bottle.

[0022] When the fixation of the sampling bottle needs to be released, the electromagnet is energized, and the electromagnet adsorbs the limit block, so that the limit block is separated from the limit groove.

[0023] Optionally, it also includes a supporting plate, which is detachably fixedly connected to the closed end of the sleeve, and the supporting plate is provided with an electric push rod, the telescopic direction of the electric push rod is the axial direction of the operating rod, and a servo motor is fixed to the telescopic end of the electric push rod, and the output shaft of the servo motor is detachably fixedly connected to the operating rod.

[0024] Through the above technical solution, the electric push rod is used to accurately control the sliding distance and sliding time of the operating rod, and the servo motor is used to accurately control the rotation angle and rotation time of the operating rod, thereby achieving precise operation, saving manpower, and greatly improving the precision and speed of the sampling operation.

[0025] Optionally, a first spiral sheet and a flexible diaphragm are coaxially provided in the piston cavity, the first spiral sheet is made of rubber, and two ends of the first spiral sheet are detachably fixed to the piston body and the closed end of the sampling bottle respectively, the outer circumferential surface of the first spiral sheet is fitted to the outer diameter circumferential surface of the piston cavity, the flexible diaphragm is cylindrical, the outer circumferential surface of the flexible diaphragm is fitted and fixed to the inner circumferential surface of the first spiral sheet, the annular gap between the flexible diaphragm and the inner diameter circumferential surface of the piston cavity is set as a reflux cavity, and the two ends of the flexible diaphragm form a first passing gap and a second passing gap between the piston body and the closed end of the sampling bottle respectively; the end surface of the piston body is pasted with release paper, and the surface of the release paper is provided with an adhesive layer.

[0026] Through the above technical solution, by setting the first spiral blade and the flexible diaphragm, when the operating rod drives the sampling bottle to rotate, the first spiral blade will guide and drive the large-size solid particles in the gas outside the piston chamber to move in the direction of the piston body, and the gas enters the reflux chamber through the first passing gap. During the gas flow process, the gas in the reflux chamber will be pushed into the second passing gap and then into the first spiral blade, thereby realizing the circulation of gas in the piston chamber.

[0027] When the gas passes through the first gap, the gas turns, and due to inertia, large-size solid particles in the gas will collide with and adhere to the adhesive layer to achieve preliminary filtration of the solid particles, thereby reducing the filtration pressure before detection and improving the accuracy of sampling detection.

[0028] By providing a detachable connection of the first spiral sheet, after the sampling and testing is completed, the piston body can be removed from the sampling bottle, and then the release paper can be removed to replace it with a new adhesive layer.

[0029] Optionally, a second helix is ​​coaxially provided in the reflux chamber, and the second helix is ​​made of rubber. Both ends of the second helix are detachably fixed to the piston body and the closed end of the sampling bottle respectively. The rotation direction of the second helix is ​​opposite to that of the first helix. The inner circumference of the second helix is ​​in contact with the inner diameter circumference of the piston chamber, and the outer circumference of the second helix is ​​in contact with the inner circumference of the flexible diaphragm.

[0030] Through the above technical solution, by setting the second spiral sheet, the circulation flow speed of the gas in the piston chamber is accelerated, thereby increasing the adhesion rate of solid particles, further reducing the filtration pressure before detection, and thus improving the sampling detection accuracy.

[0031] Optionally, the connection structure includes two flanges and a plurality of fastening bolts, the two flanges are fixedly connected to the sampling connector and the sleeve respectively, and the two flanges are fixedly connected by the fastening bolts.

[0032] The beneficial effects of this application are:

[0033] 1. By setting up the sampling joint, sleeve, operating rod, opening and closing structure, reinforcement structure, sampling bottle, and trigger structure, the sampling bottle can be directly used for sampling in the production environment, while taking into account the airtightness of the production environment before and after sampling, thereby improving the sampling detection accuracy. In addition, the sampling bottle is flexible to move and can be moved to multiple sampling points for sampling, greatly enhancing the scope of application;

[0034] 2. The electric push rod is used to accurately control the sliding distance and sliding time of the operating rod, and the servo motor is used to accurately control the rotation angle and rotation time of the operating rod, thereby achieving precise operation, saving manpower, and greatly improving the accuracy and speed of sampling operations;

[0035] 3. By setting the first spiral sheet and the second spiral sheet and combining the rotatability of the sampling bottle, the circulation flow of gas in the piston chamber is realized, so that large-size solid particles in the gas collide with and adhere to the adhesive layer to achieve preliminary filtration of solid particles, thereby reducing the filtration pressure before detection and improving the accuracy of sampling detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is an exploded view of the overall structure of Example 1.

[0037] Figure 2 It is a cross-sectional view of the overall structure of Example 1.

[0038] Figure 3 Schematic diagram of the sampling connector of Example 1.

[0039] Figure 4 Schematic diagram of the sampling bottle of Example 1.

[0040] Figure 5 yes Figure 2 A partial enlarged view of point A in the middle.

[0041] Figure 6 It is a partial cross-sectional view of the sleeve of Example 1.

[0042] Figure 7 It is a schematic diagram of Example 2 for illustrating the connection method between the sleeve and the bearing plate.

[0043] Figure 8 It is a schematic diagram of Example 3 for illustrating the connection relationship between the first spiral sheet and the flexible diaphragm.

[0044] Fig. 9 It is a partial cross-sectional view of the sleeve of Example 3.

[0045] Fig.10 It is a schematic diagram of Example 4 for illustrating the connection relationship between the first spiral sheet, the flexible diaphragm and the second spiral sheet.

[0046] Fig.11 It is a partial cross-sectional view of the sleeve of Example 4.

[0047] Description of reference numerals: 1, sampling connector; 2, sleeve; 3, sampling bottle; 10, production environment; 11, blocking plate; 111, square hole; 12, flange; 13, fastening bolt; 14, sealing ring; 141, conical surface; 15, spring; 16, notch; 17, guide block; 18, bayonet; 19, inclined surface; 20, piston chamber; 21, operating rod; 211, square block; 212, convex block; 22, sleeve; 221, first ring groove; 222, second ring groove; 223, first clamping groove; 224, second clamping groove; 225, first groove; 226, The second groove; 227, the avoidance groove; 23, the annular partition; 24, the piston body; 25, the one-way exhaust valve; 26, the one-way intake valve; 31, the accommodating groove; 32, the limit groove; 33, the electromagnet; 34, the spring; 35, the limit block; 51, the bearing plate; 52, the servo motor; 53, the electric push rod; 61, the connecting rod; 62, the trigger rod; 63, the driving plate; 71, the first spiral plate; 72, the second spiral plate; 73, the flexible diaphragm; 731, the first passing gap; 732, the second passing gap; 74, the release paper; 75, the third magnetic block; 76, the second magnetic block. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the attached Figure 1 -Attached Fig.11 Shown in.

[0049] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Example 1

[0051] Example 1 discloses a gas-tight sampling device, such as Figure 1 , Figure 2 As shown, the gas-tight sampling device includes a sampling connector 1, a sleeve 2, a sampling bottle 3, an operating rod 21, a connecting structure, a sealing plate 11, a reinforcement structure, an opening and closing structure and a trigger structure. The sampling connector 1 is used to connect with the production environment 10. The sampling connector 1 is a circular tubular structure. The production environment 10 can be the internal space of a production tank, a production cabin, a production pipeline, etc. One end of the sampling connector 1 is fixed to the side wall of the above-mentioned production environment 10.

[0052] like Figure 2, Figure 3 As shown, the sealing plate 11 is a circular plate, which is used to seal the sampling connector 1. Specifically, a sealing ring 14 is coaxially fixed to the inner wall of the outlet end of the sampling connector 1. The outer diameter of the sealing plate 11 is larger than the inner diameter of the sealing ring 14. The outer edge of the sealing plate 11 is set as a tapered portion. One end face of the sealing ring 14 is provided with a tapered surface 141 that matches the outer peripheral surface of the tapered portion. The tapered surface 141 is provided with a rubber pad (not shown in the figure).

[0053] like Figure 3 As shown, the reinforcement structure includes a plurality of spring pieces 15, each of which is evenly spaced around the sealing plate 11, one end of the spring piece 15 is fixed to the sealing plate 11, and the other end of the spring piece 15 is set as an abutting end. A notch 16 is provided at the inner diameter of the sealing ring 14 for the abutting end of the spring piece 15 to pass axially. The end surface of the sealing ring 14 facing away from the sealing plate 11 is integrally formed with an arc-shaped guide block 17, and the thickness of the guide block 17 gradually increases along the circumference of the sealing ring 14. The guide block 17 is provided with a bayonet 18, and the inner wall of the bayonet 18 is provided with a slope 19.

[0054] When the sampling connector 1 is in a sealed state, the conical portion of the sealing plate 11 and the conical surface 141 of the sealing ring 14 cooperate with each other, and the spring piece 15 is in the bayonet 18. At this time, the spring piece 15 has elastic force, and the elastic force of the spring piece 15 will force the sealing plate 11 to move axially, making the abutment between the sealing plate 11 and the sealing ring 14 tighter, thereby ensuring the sealing performance.

[0055] like Figure 2 As shown, one end of the sleeve 2 has an opening, and the other end of the sleeve 2 is closed. The open end of the sleeve 2 is detachably connected to the sampling connector 1 through a connecting structure. In this embodiment, the connecting structure includes two flanges 12 and a plurality of fastening bolts 13. The two flanges 12 are fixedly connected to the sampling connector 1 and the sleeve 2, respectively, and the two flanges 12 are fixedly connected by the fastening bolts 13.

[0056] like Figure 4 , Figure 5 As shown, the outer circumferential surface of the sampling bottle 3 is circular, the outer diameter of the sampling bottle 3 is equal to the inner diameter of the sealing ring 14 and the inner diameter of the sleeve 2, the sampling bottle 3 is axially slidingly connected to the inner wall of the sleeve 2, the end of the sampling bottle 3 facing the open end of the sleeve 2 is closed, and the other end of the sampling bottle 3 has an opening.

[0057] A sleeve 22 is fixed at the axis of the sampling bottle 3, and the sampling bottle 3 has a coaxially arranged annular partition 23. The annular partition 23 forms an annular piston cavity 20 with the inner circumference of the sampling bottle 3 and the outer circumference of the sleeve 22, that is, in this embodiment, there are two piston cavities 20. In other embodiments, the annular partitions 23 are provided in plurality and arranged in concentric circles, and an annular piston cavity 20 is formed between adjacent annular partitions 23.

[0058] An annular piston body 24 is coaxially slidably disposed in the piston chamber 20 .

[0059] The closed end of the sampling bottle 3 is provided with a one-way air inlet valve 26 and a one-way air outlet valve 25 corresponding to the piston chamber 20. The one-way air inlet valve 26 only allows external gas to enter the piston chamber 20, and the one-way air outlet valve 25 only allows the gas in the piston chamber 20 to be discharged outward.

[0060] like Figure 5 , Figure 6 As shown, the operating rod 21 is penetrated through the closed end of the sleeve 2, and a sealing ring (not shown in the figure) is provided at the penetration point, so that the operating rod 21 is rotationally connected to the sleeve 2 and axially slidably connected; the operating rod 21 is located in the sleeve 22, the outer diameter of the operating rod 21 is equal to the inner diameter of the sleeve 22, a protrusion 212 is fixed to the outer peripheral surface of the operating rod 21, and a first annular groove 221 is coaxially provided in the inner cavity of the sleeve 22, and the groove walls on opposite sides of the first annular groove 221 are respectively provided with a first groove 223 and a second groove 224, and the shapes of the first groove 223 and the second groove 224 are adapted to the protrusion 212.

[0061] An escape groove 227 connected to the first annular groove 221 is formed at one end of the sleeve 22 away from the sampling connector 1 , that is, the protrusion 212 of the operating rod 21 can enter the first annular groove 221 through the escape groove 227 .

[0062] like Figure 5 As shown, the opening and closing structure includes a square block 211 and a first magnetic block. The square block 211 is fixed at the middle position of the closed end of the sampling bottle 3. A square hole 111 is provided in the middle of the end surface of the sealing plate 11 for axial insertion of the square block 211. The inner wall of the square hole 111 is embedded with a first magnetic block (not shown in the figure). The first magnetic block can be a permanent magnet, and the first magnetic block is magnetically connected to the square block 211.

[0063] like Figure 4 As shown, the trigger structure includes a connecting rod 61 and a driving plate 63. The connecting rod 61 is fixedly connected to the piston body 24. The connecting rod 61 is parallel to the axial direction of the sampling bottle 3. The end of the connecting rod 61 away from the piston body 24 is fixed with a trigger rod 62 extending radially toward the axis of the sampling bottle 3. There is an offset angle between the trigger rods 62 of two adjacent piston bodies 24.

[0064] like Figure 4 , Figure 6As shown, the drive plate 63 is fixed on the operating rod 21, and the drive plate 63 is radially extended. The inner cavity of the sleeve 22 is coaxially provided with a second annular groove 222, and the second annular groove 222 is far away from the sampling connector 1 relative to the first annular groove 221. The inner cavity of the sleeve 22 is also provided with a first groove 225 and a second groove 226, and the two ends of the first groove 225 and the second groove 226 are respectively connected to the first annular groove 221 and the second annular groove 222, and the value of the circumferential angle between the first groove 225 and the second groove 226 is the value of the offset angle.

[0065] like Figure 5 As shown, the sleeve 2 is provided with a limiting structure, which is used to limit the relative position between the sampling bottle 3 and the sleeve 2. Specifically, the limiting structure includes an electromagnet 33, a spring 34 and a limiting block 35. The inner wall of the sleeve 2 is provided with a receiving groove 31, the electromagnet 33 is located at the bottom of the receiving groove 31, the limiting block 35 is slidably connected to the receiving groove 31, and the sliding direction is the radial direction of the sleeve 2. The outer peripheral surface of the sampling bottle 3 is provided with a limiting groove 32, the spring 34 is located in the receiving groove 31, and the end of the spring 34 is fixed to the limiting block 35. The elastic force of the spring 34 forces the limiting block 35 to be inserted into the limiting groove 32, and the magnetic force of the electromagnet 33 is used to drive the limiting block 35 to slide out of the limiting groove 32.

[0066] The implementation method of Example 1 is as follows: before sampling, the abutting end of the spring piece 15 is located in the bayonet 18, and the elastic force of the spring piece 15 will force the sealing plate 11 to tightly abut against the sealing ring 14, and then the sleeve 2 is installed on the sampling connector 1 through the connecting structure, and the electromagnet 33 is energized. The magnetic force of the electromagnet 33 forces the limit block 35 to be located in the accommodating groove 31, that is, the sampling bottle 3 can move freely relative to the sleeve 2. At this time, the protrusion 212 is located in the first slot 223, and the operating rod 21 moves axially in the direction toward the sampling connector 1 to drive the sampling bottle 3 to approach the sealing plate 11, so that the square block 211 cooperates with the square hole 111, that is, the sampling bottle 3 and the sealing plate 11 are relatively fixed, and the operating rod is rotated in the opposite direction. 21, the operating rod 21 drives the sealing plate 11 to rotate in the opposite direction relative to the sealing ring 14 through the sampling bottle 3, and the abutting end of the spring piece 15 moves through the inclined surface 19 of the bayonet 18 and the surface of the guide block 17 in sequence and is located at the notch 16, and then the operating rod 21 is moved axially in the direction toward the sampling connector 1 (the spring piece 15 axially passes through the notch 16) to bring the sealing plate 11 away from the sealing ring 14, and the sampling bottle 3 is moved into the production environment 10 with the operating rod 21. At this time, the limit groove 32 of the sampling bottle 3 is located near the limit block 35, the electromagnet 33 is de-energized, and under the action of the spring 34, the limit block 35 slides and is inserted into the limit groove 32, so that the sampling bottle 3 and the sleeve 2 are relatively fixed.

[0067] The operating rod 21 moves axially relative to the sampling bottle 3 in a direction away from the sampling connector 1, so that the protrusion 212 moves from the first slot 223 to the first annular groove 221, and then the operating rod 21 is rotated and slid, so that the protrusion 212 moves from the first annular groove 221 to the second annular groove 222 through the first groove 225. During this period, the driving plate 63 of the operating rod 21 abuts against the trigger rod 62 and drives the piston body 24 to move in a direction away from the closed end of the sampling bottle 3, and the piston chamber 20 generates negative pressure. The gas in the production environment 10 directly enters the piston chamber 20 through the one-way air inlet valve 26 to complete the air intake of the first piston chamber 20.

[0068] When it is necessary to inlet air into the second piston chamber 20, the operating rod 21 is moved axially, and the protrusion 212 moves from the second annular groove 222 to the first annular groove 221 through the first groove 225, and the operating rod 21 is rotated, and the protrusion 212 moves to the position corresponding to the second groove 226, and the driving plate 63 of the operating rod 21 moves to one side of the trigger rod 62 of another piston body 24, and the operating rod 21 is moved axially, and the protrusion 212 moves from the first annular groove 221 to the second annular groove 222 through the second groove 226. During this period, the driving plate 63 of the operating rod 21 abuts against another trigger rod 62 and drives the corresponding piston body 24 to move in a direction away from the closed end of the sampling bottle 3 to complete the air intake of the second piston chamber 20, so as to sample the gas in different time periods, thereby improving the sampling accuracy. That is, the operating rod 21 can drive each piston body 24 to slide in sequence through the trigger structure.

[0069] After sampling is completed, the operating rod 21 is rotated and slid so that the protrusion 212 is located in the second slot 224, and the electromagnet 33 is energized. The magnetic force of the electromagnet 33 forces the limit block 35 to be located in the receiving slot 31, that is, the sampling bottle 3 can move freely relative to the sleeve 2, and the operating rod 21 moves axially in the direction away from the sampling connector 1. Since the square block 211 and the square hole 111 are still fixed, the operating rod 21 will drive the sealing plate 11 to move in the direction toward the sealing ring 14 by driving the sampling bottle 3. The sealing plate 11 The spring piece 15 on the upper part moves through the notch 16 to the side of the sealing ring 14 away from the sealing plate 11, and the operating rod 21 is rotated forward. The operating rod 21 drives the sealing plate 11 to rotate forward relative to the sealing ring 14 through the sampling bottle 3. The abutting end of the spring piece 15 moves along the surface of the guide block 17 to the bayonet 18. During the forward movement of the spring piece 15, the elastic force of the spring piece 15 gradually increases. The elastic force of the spring piece 15 makes the abutment between the sealing plate 11 and the sealing ring 14 more tightly, thereby ensuring the sealing. That is, the operating rod 21 can release the fixing of the reinforcing structure on the sealing plate 11 or fix the sealing plate 11 through the opening and closing structure, and at this time, the sampling bottle 3 is completely withdrawn into the sleeve 2. Then remove the fastening bolts 13, remove the sleeve 2 and the sampling bottle 3 from the sampling connector 1, move the sleeve 2 and the sampling bottle 3 to the detection station, and when releasing the gas for detection, push the piston body 24 to discharge the gas in the piston chamber 20 through the one-way gas outlet valve 25.

[0070] In this way, by setting the sampling connector 1, sleeve 2, operating rod 21, opening and closing structure, reinforcement structure, sampling bottle 3, and trigger structure, the sampling bottle 3 can be directly sampled in the production environment 10, while also taking into account the airtightness of the production environment 10 before and after sampling, thereby improving the accuracy of sampling detection.

[0071] Furthermore, the sampling bottle 3 is flexible in movement and can be moved to multiple sampling points for sampling, thus greatly enhancing the scope of application.

[0072] Example 2

[0073] The difference between Example 2 and Example 1 is that Figure 7 As shown, the gas-tight sampling device further comprises a bearing plate 51, and the bearing plate 51 is detachably fixedly connected to the closed end of the sleeve 2, and the detachable fixed connection method can be bolt fixing.

[0074] The supporting plate 51 is fixed with an electric push rod 53, the telescopic direction of the electric push rod 53 is the axial direction of the operated rod 21, the telescopic end of the electric push rod 53 is fixed with a servo motor 52, the output shaft of the servo motor 52 is detachably fixedly connected to the operating rod 21, and the detachable fixed connection method can be bolt fixing.

[0075] Compared with Example 1 which uses manual control of the operating rod 21, this embodiment is equipped with a carrying plate 51, an electric push rod 53 and a servo motor 52 on the basis of Example 1, wherein the electric push rod 53 is used to accurately control the sliding distance and sliding time of the operating rod 21, and the servo motor 52 is used to accurately control the rotation angle and rotation time of the operating rod 21, thereby achieving precise operation, saving manpower, and greatly improving the precision and speed of the sampling operation.

[0076] Example 3

[0077] The difference between Example 3 and Example 1 is that Figure 8 , Fig. 9 As shown, a first spiral sheet 71 and a flexible diaphragm 73 are coaxially provided in the piston chamber 20. The first spiral sheet 71 is made of rubber. Both ends of the first spiral sheet 71 are detachably fixed to the piston body 24 and the closed end of the sampling bottle 3, respectively. Specifically, both ends of the first spiral sheet 71 are provided with a second magnetic block 76, and the closed end of the piston body 24 and the sampling bottle 3 are provided with a third magnetic block 75. The second magnetic block 76 is magnetically connected to the third magnetic block 75, thereby realizing a detachable connection.

[0078] The outer circumference of the first spiral sheet 71 is fitted to the outer diameter circumference of the piston chamber 20 (the piston chamber 20 has two circumferences, the circumference with a larger diameter is the outer diameter circumference, and the circumference with a smaller diameter is the inner diameter circumference). The flexible diaphragm 73 can be a plastic film, which is cylindrical. The outer circumference of the flexible diaphragm 73 is fitted to and bonded to the inner circumference of the first spiral sheet 71. The annular gap between the flexible diaphragm 73 and the inner diameter circumference of the piston chamber 20 is set as a reflux chamber. The two ends of the flexible diaphragm 73 respectively form a first passing gap 731 and a second passing gap 732 between the piston body 24 and the closed end of the sampling bottle 3.

[0079] Since both the flexible diaphragm 73 and the first spiral sheet 71 are axially compressible, when the piston body 24 is located near the closed end of the sampling bottle 3, the first spiral sheet 71 and the flexible diaphragm 73 are both in a compressed state. When the piston body 24 slides to the farthest point away from the closed end of the sampling bottle 3, the piston body 24 drives the end of the first spiral sheet 71 to move axially to expand the first spiral sheet 71 to make it spiral. At the same time, the first spiral sheet 71 also expands the flexible diaphragm 73 to make it cylindrical.

[0080] A release paper 74 is pasted on the end surface of the piston body 24 , and an adhesive layer (not shown in the figure) is provided on the surface of the release paper 74 , that is, the release paper 74 can be easily peeled off from the piston body 24 .

[0081] When sampling is completed, the square block 211 is separated from the square hole 111, and the sampling bottle 3 is in a free rotation state. The sampling bottle 3 is driven to rotate by the operating rod 21 to drive the first spiral blade 71 to rotate. Due to the inertia of gas and solid particles (solid particles exist in the production environment 10, and the solid particles will enter the sampling bottle 3 with the negative pressure sampling), the rotating first spiral blade 71 will guide and drive the large-size solid particles in the gas outside the piston chamber 20 to move toward the piston body 24, so that the gas passes through the first passing gap 731 and enters the reflux chamber. In the process of gas flow, the gas in the reflux chamber will be pushed into the second passing gap 732 and re-enter the first spiral blade 71, thereby realizing the circulation of gas in the piston chamber 20.

[0082] Among them, when the gas passes through the first gap 731, the gas will turn. Due to inertia, large-size solid particles in the gas will collide with and adhere to the adhesive layer to achieve preliminary filtration of the solid particles, thereby reducing the filtration pressure before detection (the gas in the sampling bottle 3 still needs to undergo a round of filtration when discharged to the detection station), thereby improving the accuracy of sampling detection.

[0083] After the sampling and testing is completed, the piston body 24 can be removed from the sampling bottle 3, and then the release paper 74 can be removed to replace a new adhesive layer for the next sampling.

[0084] Example 4

[0085] The difference between Example 4 and Example 3 is that Fig.10 , Fig.11 As shown, a second spiral piece 72 is coaxially provided in the reflux chamber. The second spiral piece 72 is made of rubber. Both ends of the second spiral piece 72 are detachably fixed to the piston body 24 and the closed end of the sampling bottle 3 respectively. The detachable connection method is the same as the detachable connection method of the first spiral piece 71, which is also a magnetic connection.

[0086] The rotation direction of the second spiral piece 72 is opposite to that of the first spiral piece 71 . The inner circumference of the second spiral piece 72 is in contact with the inner diameter circumference of the piston chamber 20 , and the outer circumference of the second spiral piece 72 is in contact with the inner circumference of the flexible diaphragm 73 .

[0087] The sampling bottle 3 is driven to rotate by the operating rod 21, so as to drive the first spiral piece 71 and the second spiral piece 72 to rotate simultaneously. The driving direction of the second spiral piece 72 for solid particles is opposite to the driving direction of the first spiral piece 71, so that the circulation flow speed of the gas in the reflux chamber is accelerated, thereby increasing the adhesion rate of the solid particles, further reducing the filtration pressure before detection, and thus improving the accuracy of sampling detection.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A gas-tight sampling device, characterized in that: The invention comprises a sampling joint (1), a sleeve (2), a sampling bottle (3), an operating rod (21), a connecting structure, a blocking plate (11), a reinforcement structure, an opening and closing structure and a trigger structure. The sampling joint (1) is used to communicate with a production environment (10). One end of the sleeve (2) has an opening, and the other end of the sleeve (2) is closed. The open end of the sleeve (2) is detachably connected to the sampling joint (1) via a connecting structure. The blocking plate (11) is used to block the sampling joint (1). The reinforcement structure is used to fix the blocking plate (11) and the sampling joint (1). The sampling bottle (3) is axially slidably connected to the inner wall of the sleeve (2). One end of the sampling bottle (3) has an opening, and the other end of the sampling bottle (3) is closed. A sleeve (22) is fixed at the axis of the sampling bottle (3). The rod (21) is located in the sleeve (22); the sampling bottle (3) has a coaxially arranged annular partition (23); the annular partition (23) and the inner circumference of the sampling bottle (3) and the outer circumference of the sleeve (22) respectively form an annular piston cavity (20); an annular piston body (24) slides in the piston cavity (20); the closed end of the sampling bottle (3) is provided with a one-way air inlet valve (26) and a one-way air outlet valve (25) corresponding to the piston cavity (20); the operating rod (21) is penetrated through the closed end of the sleeve (2); the operating rod (21) is connected to the sleeve (2) in a rotational manner and in an axially sliding manner; the operating rod (21) is used to release the fixing of the reinforcing structure to the blocking plate (11) through the opening and closing structure, and the operating rod (21) is used to drive each piston body (24) to slide in sequence through the trigger structure.

2. The gas-tight sampling device according to claim 1, characterized in that: A sealing ring (14) is coaxially fixed to the inner wall of the outlet end of the sampling connector (1); the sealing plate (11) is circular, and the outer diameter of the sealing plate (11) is larger than the inner diameter of the sealing ring (14); the opening and closing structure comprises a square block (211) and a first magnetic block; the square block (211) is fixed to the closed end of the sampling bottle (3); a square hole (111) is provided in the middle of the end surface of the sealing plate (11) for axial insertion of the square block (211); the first magnetic block is embedded in the inner wall of the square hole (111); the first magnetic block is magnetically connected to the square block (211); A protrusion (212) is fixed on the outer peripheral surface of the operating rod (21); a first annular groove (221) is coaxially provided in the inner cavity of the sleeve (22); and a first clamping groove (223) and a second clamping groove (224) are respectively provided on the groove walls on opposite sides of the first annular groove (221); the reinforcement structure comprises a plurality of spring sheets (15); one end of the spring sheet (15) is fixed to the sealing plate (11); the other end of the spring sheet (15) is set as an abutting end; a notch (16) is provided at the inner diameter of the sealing ring (14) for the abutting end of the spring sheet (15) to pass axially; and the sealing ring (14) is away from the sealing plate (11). The end surface of the sealing ring (14) is integrally formed with an arc-shaped guide block (17), the thickness of the guide block (17) gradually increases along the circumference of the sealing ring (14), the guide block (17) is provided with a bayonet (18), and the inner wall of the bayonet (18) is provided with an inclined surface (19); when it is necessary to open the sampling connector (1), the abutting end of the spring piece (15) is located in the bayonet (18), the protrusion (212) is located in the first slot (223), and the operating rod (21) moves axially in the direction toward the sampling connector (1) to drive the sampling bottle (3) close to the blocking plate (11), so that the square block (211) cooperates with the square hole (111), rotates the operating rod (21) in the opposite direction, and the operating rod (21) drives the sealing plate (11) to rotate in the opposite direction relative to the sealing ring (14) through the sampling bottle (3). The abutting end of the spring piece (15) moves in sequence through the inclined surface (19) of the bayonet (18) and the surface of the guide block (17) to be located at the notch (16). The operating rod (21) moves axially in the direction toward the sampling connector (1) to bring the sealing plate (11) away from the sealing ring (14), and the sampling bottle (3) moves into the production environment (10) along with the operating rod (21);When the sampling connector (1) needs to be blocked, the operating rod (21) moves axially in a direction away from the sampling connector (1), the protrusion (212) moves from the first clamping groove (223) to the second clamping groove (224), and the operating rod (21) continues to move axially in a direction away from the sampling connector (1). The operating rod (21) drives the sampling bottle (3) to drive the blocking plate (11) to move in a direction toward the sealing ring (14), and the blocking plate (11) is moved upward. The spring piece (15) passes through the notch (16) and moves to the side of the sealing ring (14) away from the sealing plate (11), and the operating rod (21) is rotated in the positive direction. The operating rod (21) drives the sealing plate (11) to rotate in the positive direction relative to the sealing ring (14) through the sampling bottle (3). The abutting end of the spring piece (15) moves along the surface of the guide block (17) into the bayonet (18). During the positive movement of the spring piece (15), the elastic force of the spring piece (15) gradually increases. ; 3. The gas-tight sampling device according to claim 2, characterized in that: The outer edge of the blocking plate (11) is provided as a tapered portion, one end surface of the sealing ring (14) is provided with a tapered surface (141) matching with the outer peripheral surface of the tapered portion, and the tapered surface (141) is provided with a rubber pad.

4. The gas-tight sampling device according to claim 2, characterized in that: An escape groove (227) connected to the first annular groove (221) is formed at one end of the sleeve (22) away from the sampling connector (1).

5. The gas-tight sampling device according to claim 2, characterized in that: The trigger structure comprises a connecting rod (61) and a driving plate (63), wherein the connecting rod (61) is fixedly connected to the piston body (24), and a trigger rod (62) extending radially toward the axis of the sampling bottle (3) is fixed at the end of the connecting rod (61), and an offset angle is provided between the trigger rods (62) of two adjacent piston bodies (24); the driving plate (63) is fixed to the operating rod (21); a second annular groove (222) is coaxially provided in the inner cavity of the sleeve (22), and the second annular groove (222) is away from the sampling connector (1) relative to the first annular groove (221), and the inner cavity of the sleeve (22) is also provided with a first The first groove (225) and the second groove (226) are connected to each other in the circumferential direction, and the value of the circumferential angle between the first groove (225) and the second groove (226) is the value of the offset angle. The two ends of the first groove (225) and the second groove (226) are respectively connected to the first annular groove (221) and the second annular groove (222). The sleeve (2) is provided with a limiting structure, and the limiting structure is used to limit the relative position between the sampling bottle (3) and the sleeve (2). When the sampling bottle (3) moves into the production environment (10) along with the operating rod (21), the limiting structure limits the relative position between the sampling bottle (3) and the sleeve (2). The operating rod (2 1) The operation rod (21) is axially moved relative to the sampling bottle (3) in a direction away from the sampling connector (1), and the protrusion (212) moves from the first annular groove (221) through the first groove (225) to the second annular groove (222). During this period, the driving plate (63) of the operating rod (21) abuts against the trigger rod (62) and drives the piston body (24) to move in a direction away from the closed end of the sampling bottle (3), so as to complete the air intake of the first piston chamber (20); when it is necessary to intake air into the second piston chamber (20), the operating rod (21) is axially moved, and the protrusion (212) moves from the second annular groove (222) through the first groove (225) to the first annular groove (221). The operating rod (21) is rotated, the protrusion (212) moves to the position corresponding to the second groove (226), and the driving plate (63) of the operating rod (21) moves to one side of the trigger rod (62) of the other piston body (24), and the operating rod (21) is moved axially, and the protrusion (212) moves from the first annular groove (221) through the second groove (226) to the second annular groove (222). During this period, the driving plate (63) of the operating rod (21) abuts against the other trigger rod (62) and drives the corresponding piston body (24) to move in a direction away from the closed end of the sampling bottle (3), so as to complete the air intake of the second piston chamber (20).

6. The gas-tight sampling device according to claim 5, characterized in that: The limiting structure comprises an electromagnet (33), a spring (34) and a limiting block (35); the inner wall of the sleeve (2) is provided with a receiving groove (31); the electromagnet (33) is located at the bottom of the receiving groove (31); the limiting block (35) is slidably connected to the receiving groove (31); the outer peripheral surface of the sampling bottle (3) is provided with a limiting groove (32); the spring (34) is used to force the limiting block (35) to be inserted into the limiting groove (32); and the magnetic force of the electromagnet (33) is used to drive the limiting block (35) to slide out of the limiting groove (32).

7. The gas-tight sampling device according to claim 1, characterized in that: The invention also comprises a bearing plate (51), the bearing plate (51) being detachably fixedly connected to the closed end of the sleeve (2), the bearing plate (51) being provided with an electric push rod (53), the telescopic direction of the electric push rod (53) being the axial direction of the operating rod (21), a servo motor (52) being fixedly connected to the telescopic end of the electric push rod (53), and the output shaft of the servo motor (52) being detachably fixedly connected to the operating rod (21).

8. The gas-tight sampling device according to any one of claims 1 to 7, characterized in that: A first spiral sheet (71) and a flexible diaphragm (73) are coaxially arranged in the piston chamber (20). The first spiral sheet (71) is made of rubber. The two ends of the first spiral sheet (71) are detachably fixed to the piston body (24) and the closed end of the sampling bottle (3). The outer peripheral surface of the first spiral sheet (71) is in contact with the outer diameter peripheral surface of the piston chamber (20). The flexible diaphragm (73) is cylindrical. The outer peripheral surface of the flexible diaphragm (73) is in contact with the inner peripheral surface of the first spiral sheet (71). The annular gap between the flexible diaphragm (73) and the inner diameter peripheral surface of the piston chamber (20) is set as a reflux chamber. The two ends of the flexible diaphragm (73) are respectively formed with the piston body (24) and the closed end of the sampling bottle (3) to form a first passing gap (731) and a second passing gap (732). The end surface of the piston body (24) is pasted with a release paper (74), and the surface of the release paper (74) is provided with an adhesive layer.

9. The gas-tight sampling device according to claim 8, characterized in that: A second spiral sheet (72) is coaxially arranged in the reflux chamber. The second spiral sheet (72) is made of rubber. The two ends of the second spiral sheet (72) are detachably fixed to the piston body (24) and the closed end of the sampling bottle (3), respectively. The rotation direction of the second spiral sheet (72) is opposite to that of the first spiral sheet (71). The inner circumference of the second spiral sheet (72) is in contact with the inner diameter circumference of the piston chamber (20), and the outer circumference of the second spiral sheet (72) is in contact with the inner circumference of the flexible diaphragm (73).

10. The gas-tight sampling device according to claim 1, characterized in that: The connection structure comprises two flanges (12) and a plurality of fastening bolts (13); the two flanges (12) are fixedly connected to the sampling connector (1) and the sleeve (2) respectively; and the two flanges (12) are fixedly connected via the fastening bolts (13).

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