Low-residue Y-shaped heat preservation sampling device

Abstract

The invention discloses a low-residue Y-shaped heat preservation sampling device, and relates to the technical field of valves, the low-residue Y-shaped heat preservation sampling device comprises a valve body, the valve body comprises a valve body flow channel and a valve body main body, the valve body main body is fixed below the valve body flow channel, a moving channel is arranged in the valve body main body, a valve rod is arranged in the moving channel in a sliding mode, a valve rod head is arranged on the valve rod, and the valve rod head is connected with the valve body main body. The head of the valve rod is of an arc-shaped structure, a sampling body is arranged on the side face of the valve body, a sampling channel communicated with the moving channel is formed in the sampling body, the head of the valve rod is designed according to the shape of a valve body flow channel, when the valve rod is closed, the head of the valve rod is completely attached to the valve body flow channel, and medium staying caused by non-coincidence is reduced. When the valve is completely opened, the arc shape of the head of the valve rod coincides with a sampling outlet flow channel, a flow guiding effect is achieved, and the head of the valve rod is prevented from affecting outlet flow. And meanwhile, the opening height of the valve is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valves, in particular to a low-residual Y-shaped heat-preservation sampling device. BACKGROUND

[0002] In a polycarbonate production process by a non-phosgene method, medium residues in an ester exchange reaction process affect the quality of products, so valves in process pipelines need to avoid "dead zones" to reduce medium residues. Part of the medium in the ester exchange reaction will solidify and crystallize at room temperature, so the valves in the ester exchange process section all adopt heat preservation structures. Most of the sampling valves on the market adopt a stop type structure, the valve is opened by rotating a valve rod, and the flow area between a valve disc and a valve seat is changed to control the sampling amount. The conventional structure is prone to generate "dead zones" at the joint between the valve disc and the valve body, pollute the medium, and cause the analyzed sample liquid to deviate from the medium in the pipeline. In addition, the viscous medium will hang on the wall and deposit on the surface of the flow channel. The opening height of the valve has no limit, and the flow rate of the medium is uneven during each sampling. The transition flow channel between the sampling port and the valve seat does not have a reasonable inclination angle, the viscous medium flows out slowly during sampling, and is prone to be left in the transition flow channel section, affecting the accuracy of sampling. The sampling interface of the sampling valve on the market is mostly connected by threads, the sample liquid is rotated for many circles, and the operation is complex. After the sample liquid is taken out, the medium left in the transition flow channel slowly flows out. The residual medium drops on the ground, causing environmental pollution. SUMMARY

[0003] The application aims to solve the technical problem of providing a low-residual Y-shaped heat-preservation sampling device, and solve the problem of medium deposition in the existing sampling valve.

[0004] TECHNICAL SOLUTION

[0005] To solve the above problems, the technical scheme provided by the application is:

[0006] The utility model provides a low residual Y type heat preservation sampling device, including valve body, the valve body includes valve body flow channel and valve body main part, the valve body main part is fixed in the valve body flow channel below, be equipped with mobile passageway in the valve body main part, the valve rod is slidably equipped in the mobile passageway, be equipped with valve rod head on the valve rod, the valve rod head is arc structure, the valve body main part side is equipped with sampling main part, be equipped with sampling passageway with the mobile passageway intercommunication in the sampling main part, the valve body downside is equipped with nut mounting frame, be equipped with double -end stand between the valve body main part of nut mounting frame both sides, the double -end stand upside on one side is fixedly equipped with close limit ring, the double -end stand downside on the other side is fixedly equipped with open limit ring, be equipped with connecting block on the valve rod, be equipped with handle on the connecting block, the handle with the abutment of double -end stand both sides, when the handle with close limit ring abutment, the valve rod head is pasted with the valve body flow channel, when the handle with open limit ring abutment, the valve rod head is towards the sampling passageway.

[0007] Further, the valve body flow channel and the valve body main part outside are provided with a jacket, the jacket is provided with a gap between the valve body flow channel and the valve body, and a heat preservation medium is filled in the gap between the jacket, the valve body flow channel and the valve body.

[0008] Further, the sampling main part is sleeved with the jacket.

[0009] Further, the valve rod is arranged eccentrically with the center line of the valve body flow channel, and the lowest point of the arc structure of the valve rod head is higher than the lowest point of the pipe wall of the valve body flow channel.

[0010] Further, the sampling main part is inclined downward from one side to the other side of the valve body.

[0011] Further, the sampling passageway is tangent to the arc surface of the valve rod head towards the sampling passageway.

[0012] Further, the double-end stand is in a stepped structure at both ends.

[0013] Further, light plane bearings are arranged between the upper and lower sides of the valve rod nut and the nut mounting frame, and shaft clamping springs are fixedly arranged outside the light plane bearings of the nut mounting frame.

[0014] Further, an annular sleeve is fixedly arranged on the lower side of the valve rod nut, and a hand wheel is fixedly arranged on the annular sleeve.

[0015] Further, a connecting sleeve is connected to the sampling main part, a sampling bottle is arranged at the other end of the connecting sleeve, and a sealing ring is arranged on the section where the connecting sleeve is connected to the sampling main part and the sampling bottle.

[0016] Beneficial effects

[0017] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0018] 1. The center of the valve stem is not coincident with the center of the valve body, and the lowest point of the valve stem is higher than the lowest point of the valve body, thereby avoiding that rust and other impurities in the pipeline enter the sampling flow channel.

[0019] 2. The head of the valve stem is designed according to the shape of the flow channel of the valve body, and when the valve is closed, the head of the valve stem completely matches the flow channel of the valve body, thereby reducing the medium residence caused by non-coincidence and affecting the accuracy of sampling. When the valve is fully opened, the limit and shift design ensures that the arc shape of the head of the valve stem coincides with the sampling outlet flow channel, has a flow guiding effect, prevents the head of the valve stem from affecting the outlet flow, and at the same time reduces the opening height of the valve.

[0020] 3. The flow channel of the sampling port is designed to have an inclined angle according to the characteristics of the medium, and when the valve stem is fully opened, the arc of the head of the valve stem is tangent to the inclined angle, so that the medium flows out to the sampling bottle more smoothly, reduces the medium residue caused by unreasonable flow channel design, and affects the accuracy of sampling.

[0021] 4. Light plane bearings are designed on the valve stem nut in an up-down manner, which is different from the light plane bearings pressed by the valve stem nut cover in the valve industry. The design adopts a shaft clamp spring to press the light plane bearing, thereby shortening the height of the valve stem nut and reducing the installation height of the entire valve.

[0022] 5. The design of the quick change-over joint, the connection sleeve is designed to be directly gripped and rotated for disassembly and assembly by one hand, and the connection sleeve is designed to have an exhaust structure. For toxic gas, the customer can equip an activated carbon adsorption device according to needs. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of embodiment 1 of the present application;

[0024] Figure 2 is a sectional view of the valve stem of embodiment 1 of the present application in an unsampling state;

[0025] Figure 3 is a sectional view of the sampling main body and the connection sleeve of embodiment 1 of the present application;

[0026] Figure 4 is a schematic view of the exhaust structure of embodiment 1 of the present application;

[0027] Figure 5 is a sectional view of the valve stem of embodiment 1 of the present application in a sampling state.

[0028] 1, valve body; 11, valve body flow channel; 12, valve body main body; 2, jacket; 3, valve stem; 31, valve stem head; 4, packing; 5, nut mounting frame; 6, packing ring; 7, packing gland; 8, double-end stand; 9, limit ring 9; 10, connecting block 10; 12, handle; 13, open limit ring; 14, valve stem nut; 141, annular sleeve; 15, light plane bearing; 16, shaft clamp spring; 17, hand wheel; 19, sealing ring; 20, connecting sleeve; 21, sampling bottle; 23, spring; 25, clamping cap; 26, insertion rod; 27, clamping groove; 41, sampling main body; 42, sampling channel; 44, exhaust hole; DETAILED DESCRIPTION

[0029] In order to make the technical scheme of the present application clearer, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] Embodiment 1

[0031] In combination with the drawings Figures 1-5 A low-residual Y-shaped heat preservation sampling device, comprising a valve body 1, the valve body 1 is composed of a valve body flow channel 11 located at the top and a valve body main body 12 fixedly connected below the valve body flow channel 11, the valve body flow channel 11 is a pipeline for medium flow for normal medium flow, and the valve body main body 12 is used for installing a valve stem 3 and other related parts, a jacket 2 is fixedly sleeved outside the valve body 1, the jacket 2 is wrapped outside the valve body 1, the jacket 2 and the valve body 1 remain relatively fixed, the jacket 2 is fixed at the valve body main body 12 of the valve body 1 at the bottom, and the jacket 2 and the valve body 1 have a gap therebetween, the gap between the jacket 2 and the valve body 1 is used for flowing a heat preservation medium, and the heat preservation medium is used for heat preservation of the medium in the medium flow pipeline to prevent the medium in the valve body flow channel 11 from solidifying. The jacket 2 completely wraps the valve body flow channel 11 and at the same time wraps part of the valve body main body 12, and the part of the valve body main body 12 wrapped by the jacket 2 and the part of the valve body flow channel 11 wrapped by the jacket 2 are in communication with each other. The heat preservation medium can be selected to be steam or heat conducting oil, etc., to heat the medium in the valve body 1 to prevent the medium from solidifying and crystallizing.

[0032] A moving channel is arranged in the valve body main body 12, the moving channel penetrates through the valve body main body 12, the moving channel extends from the lower side of the valve body main body 12 into the valve body flow channel 11, and a valve stem 3 is slidably arranged in the moving channel, and the valve stem 3 moves up and down in the moving channel.

[0033] The valve rod head 31 is arc-shaped structure, the valve rod 3 is the head to the side of the valve body flow channel 11, the shape of the valve rod head 31 corresponds to the shape of the medium flow pipe inside the valve body flow channel 11, when the valve rod 3 is located at the top of the moving channel, the valve rod head 31 is attached to the inner wall of the valve body flow channel 11, the valve rod head 31 and the inner wall of the valve body flow channel 11 form a complete pipe shape, the valve rod head 31 will not protrude in the valve body flow channel 11, and will not be sunken in the moving channel, the valve rod head 31 can block the opening of the end wall of the valve body flow channel 11 connected to the moving channel. The valve rod head 31 is completely attached to the valve body flow channel 11, preventing the valve rod 3 from extending from the moving channel into the valve body flow channel 11 to hinder the flow of medium in the valve body flow channel 11, reducing the medium residence caused by misalignment; at the same time, it also prevents the valve rod 3 from sinking, forming a gap below the flow channel of the valve body flow channel 11, causing the medium to stay for a long time, affecting the accuracy of the sample solution.

[0034] The valve rod 3 is not aligned with the vertical center line of the valve body flow channel 11 of the valve body 1, the valve rod 3 is eccentrically arranged with the valve body flow channel 11, so that the lowest point of the arc-shaped structure of the valve rod head 31 is higher than the lowest point of the valve body flow channel 11, preventing the deposition of rust and other impurities in the valve body flow channel 11 from entering the moving channel of the valve rod 3 when deposited at the lowest point, causing the sampling to be blocked, affecting the normal sampling and accuracy of the sample solution.

[0035] The valve body 1 is fixedly provided with a sampling main body 41 on the side surface of the valve body main body 12, the sampling main body 41 is provided with a sampling channel 42, the sampling channel 42 is communicated with the moving channel, when the valve rod 3 is lowered, the medium in the valve body flow channel 11 will flow into the moving channel and enter the sampling channel 42. The sampling main body 41 is inclined, the sampling main body 41 is inclined downward from one side to the other side fixedly connected to the valve body 1, and the sampling channel 42 is located at the center of the sampling main body 41, the sampling channel 42 is inclined synchronously with the sampling main body 41, facilitating the flow of medium. The outer side of the sampling main body 41 can also be wrapped with a jacket, and a heat preservation medium is arranged in the jacket to prevent the medium from solidifying during sampling.

[0036] When the valve stem 3 is lifted in the moving channel, the valve stem 3 itself rotates, and the arc-shaped structure of the valve stem head 31 is rotated to face the sampling channel 42 in the direction of the smooth inner wall of the valve body flow channel 11. The arc-shaped structure of the valve stem head 31 is rotated to face the sampling channel 42, ensuring that the arc surface of the valve stem head 31 faces the opening of the sampling channel 42 connected to the moving channel. The arc-shaped structure has a good flow guiding effect, and the medium in the moving channel can be guided to the sampling channel through the arc surface of the valve stem head 31. If the arc surface of the valve stem head 31 is misaligned with the sampling channel 42, the higher side of the arc-shaped structure of the valve stem head 31 will block the opening of the sampling channel 42, affecting the outlet flow of the medium during sampling. The arc-shaped structure of the head of the valve stem 3 allows the valve stem 3 to be lowered without being completely lowered to the lower side of the opening of the sampling channel 42, reducing the opening height of the valve.

[0037] The inclination angle of the sampling body 41 is set according to different flow media in the valve body flow channel 11. The sampling channel 42 is located on the axial centerline of the sampling body 41. Preferably, the sampling body 41 is rotated 10 degrees clockwise in the horizontal direction, and the sampling channel 42 is also inclined. The inclination angle of the sampling channel 42 is also 10°, following the inclination angle of the sampling body 41.

[0038] Further, when the valve stem 3 is fully opened, the arc surface of the arc-shaped structure of the valve stem head 31 is tangent to the inclination angle of the wall of the sampling channel 42, allowing the medium to flow more smoothly into the sampling bottle 21, reducing the residual medium due to unreasonable flow channel design, and affecting the accuracy of sampling.

[0039] The valve stem 3 extends downward from the valve body 1 of the valve body 1, and the lower side of the valve body 1 is provided with a packing groove. The valve stem 3 passes through the center of the packing groove. The packing groove is used to seal the valve stem 3. The gap between the inner wall of the packing groove and the valve stem 3 is filled with packing 4. The packing groove is also provided with a packing pressing ring 6 for plugging the filled packing 4. The lowermost side of the packing groove is also provided with a packing gland 7. The packing gland 7 abuts and compresses the packing pressing ring 6, and the packing pressing ring 6 compresses the packing 4, so that the valve stem 3 is sealed by the packing 4.

[0040] The lower side of the valve body 1 is provided with a nut mounting frame 5. The lower side of the valve body 1 of the valve body 1 is provided with an outwardly expanded flange. The nut mounting frame 5 and the flange of the valve body 1 are provided with a double-headed column 8. The double-headed column 8 is arranged on both sides of the valve body 1 and the nut mounting frame 5. The two ends of the double-headed column 8 are stepped structures, and the diameters of the two ends are smaller than the diameter of the middle part. The two ends of the double-headed column 8 pass through the nut mounting frame 5 and the valve body 1 respectively, and the middle part with a slightly larger diameter is supported between the nut mounting frame 5 and the valve body 1, so that the nut mounting frame 5 and the valve body 1 maintain a certain distance. The two ends of the double-headed column 8 pass through the nut mounting frame 5 and the valve body 1 and are fixed by nuts.

[0041] The valve stem nut 14 is rotatably arranged in the nut mounting frame 5, and the valve stem nut 14 is concentric with the valve stem 3. The nut mounting frame 5 is provided with light plane bearings 15 for the rotation of the valve stem nut 14 relative to the nut mounting frame 5. The light plane bearings 15 are arranged at the upper and lower ends of the valve stem nut 14. The nut mounting frame 5 is provided with shaft clamping springs 16 corresponding to the light plane bearings 15. The shaft clamping springs 16 are fixed outside the light plane bearings 15 at the upper and lower ends. The shaft clamping springs 16 are used to fix the light plane bearings 15, and can prevent the valve stem nut 14 from moving up and down, so that the valve stem nut 14 can only rotate.

[0042] The valve stem 3 passes through the threaded hole of the valve stem nut 14. The valve stem 3 is provided with threads for screwing with the valve stem nut 14. The valve stem nut 14 can drive the valve stem 3 to move up and down by rotating. The valve stem nut 14 is integrally provided with an annular sleeve 141 extending downward from the bottom surface of the valve stem nut 14. The annular sleeve 141 is sleeved with a hand wheel 17. The hand wheel 17 is fixedly connected with the annular sleeve 141. The fixed position of the annular sleeve 141 and the hand wheel 17 can be a polygonal structure. The hand wheel 17 is provided with a hole matched with the polygonal structure. The polygonal structure of the annular sleeve 141 is clamped with the annular sleeve 141. Thus, the annular sleeve 141 is rotated by rotating the hand wheel 17, and the valve stem nut 14 is further rotated. The annular sleeve 141 can be provided with threads, so that the hand wheel 17 is fixed on the annular sleeve 141 by double nuts. The double nuts can prevent the hand wheel 17 from falling off under long-term use.

[0043] The valve stem 3 between the nut mounting frame 5 and the valve body 1 is fixedly provided with a connecting block 10. The connecting block 10 can be fixed on the valve stem 3 by a pin shaft. The pin shaft penetrates the valve stem 3 and the connecting block 10 to fix them. The side surface of the connecting block 10 is symmetrically provided with a handle 12. The length of the handle 12 exceeds the length of the double-headed column 8 on both sides. The handle 12 on the connecting block 10 can rotate synchronously with the valve stem 3 through the connecting block 10. Thus, when the handle 12 rotates with the connecting block 10, the limit angle of the handle 12 is the abutment between the handle 12 and the double-headed column 8.

[0044] The open limiting ring 13 and the close limiting ring 9 are respectively fixed on the double-headed columns 8 on both sides, the distance between the opposite faces of the open limiting ring 13 and the close limiting ring 9 is the lifting distance of the valve rod 3, and in actual setting, the thickness of the handle 12 needs to be added to remove the influence of the thickness of the handle 12 on the limiting distance of the open limiting ring 13 and the close limiting ring 9, the open limiting ring 13 is located on the lower side of the double-headed column 8 on one side, and the close limiting ring 9 is located on the upper side of the double-headed column 8 on the other side, that is, when the handle 12 abuts against the open limiting ring 13, the arc-shaped structure of the valve rod head 31 faces the sampling channel 42, and when the handle 12 contacts the close limiting ring 9, the arc-shaped structure of the valve rod head 31 is attached to the inner wall of the valve body flow channel 11 to form a perfect flow channel, the double-headed columns 8 are used to limit the rotation angle of the handle 12, the handle 12 only cooperates with the open limiting ring 13 of one of the double-headed columns 8 and the close limiting ring 9 on the other double-headed column 8, and the handle 12 rotates between the close limiting ring 9 and the open limiting ring 13 of the double-headed columns 8 on both sides and moves up and down, so as to realize the opening and closing of the valve rod 3. The open limiting ring 13 on the double-headed column 8 is located on the lower side, and the close limiting ring 9 on the double-headed column 8 is located on the upper side, and the double-headed columns 8 on both sides can be provided with the close limiting ring 9 and the open limiting ring 13.

[0045] In actual setting, the double-headed columns 8 on both sides of the valve body 1 are symmetrically arranged on both sides of the valve body 1, and the radial center lines of the double-headed columns 8 on both sides are on the same straight line, because the thickness of the double-headed columns 8 and the handle 12 in actual setting causes the rotation arc of the handle 12 to be less than 180 degrees, the position of the sampling channel 42 needs to be set according to the rotation angle of the handle 12 and the arc-shaped structure of the valve rod head 31, preferably, when the handle 12 is located at the position abutting against the close limiting ring 9, the arc surface of the arc-shaped structure of the valve rod head 31 is perpendicular to the flow direction of the valve body flow channel 11, because the handle 12 cannot rotate by 180 degrees, the sampling channel 42 and the flow direction of the valve body flow channel 11 should not be arranged perpendicularly, and an acute angle is formed between the sampling channel 42 and the valve body flow channel 11, and the rotation angle of the head of the valve body 1 is an obtuse angle, so that the two limit rotation angles of the handle 12 are the angles at which the arc-shaped structure of the valve rod head 31 is completely attached to the valve body flow channel 11 and the angle at which the arc-shaped structure faces the sampling channel 42, and thus the position of the sampling channel 42 is designed according to the limit angle of the rotation of the handle 12.

[0046] The flow channel of the valve body 1 and the arc surface of the valve rod head 31 are both polished, and the surface roughness reaches 0.2 μm, so as to reduce the flow resistance in each part of the pipeline. The surface of the valve rod 3 is sprayed with wear-resistant and corrosion-resistant materials and is subjected to fine grinding treatment, so as to improve the hardness and roughness of the surface of the valve rod 3.

[0047] In normal sampling, the handle 12 abuts against the closed limit ring 9, and the arc surface of the valve stem head 31 abuts against the inner wall of the valve body flow passage 11 to form a perfect flow passage for the medium, when sampling, the worker can rotate the hand wheel 17 to drive the valve stem nut 14 to rotate, first the valve stem nut 14 drives the valve stem 3 to rotate, the handle 12 on the valve stem 3 is moved to the position abutting against the double-headed column 8 where the open limit ring 13 is located by the closed limit ring 9, at this time the valve stem head 31 on the valve stem 3 is rotated from the direction towards the inside of the flow passage to the direction of the sampling channel 42, continue to rotate the hand wheel 17, at this time the handle 12 on the valve stem 3 cannot continue to rotate due to the limitation of the double-headed column 8, at this time, the continuous rotation of the valve stem nut 14 drives the valve stem 3 to descend through the thread cooperation between the valve stem nut 14 and the valve stem 3, the valve stem 3 descends to drive the handle 12 to descend synchronously, until the handle 12 abuts against the closed limit ring 9, at this time the arc surface of the valve stem head 31 is aligned with the sampling channel 42 and makes the moving channel and the sampling channel communicate, the flowing medium in the valve body flow passage 11 will flow into the sampling channel 42 through the moving channel, when closing the sampling channel, reverse the hand wheel 17, the handle 12 will rotate from the position abutting against the open limit ring 13 to the position abutting against the double-headed column 8 where the closed limit ring 9 is located, then the handle 12 rises with the rotation of the hand wheel 17 until it abuts against the closed limit ring 9, at this time the valve stem head 31 abuts against the valve body flow passage 11 again.

[0048] The connecting sleeve 20 is connected to the sampling body 41, one end of the connecting sleeve 20 is connected to the sampling body 41, and the other end is connected to the sampling bottle 21, the connecting sleeve 20 is sleeved on the end of the sampling body 41, the connecting sleeve 20 is designed as a detachable structure that can be directly gripped and rotated with one hand, which is convenient to detach together with the sampling bottle 21 from the sampling body 41, the quick release structure of the connecting sleeve 20 has various designs, preferably, the connecting sleeve 20 is provided with a clamping structure, the opening and closing structure includes a clamping groove, a clamping cap 25 is slidably arranged in the clamping groove, a through hole is arranged in the clamping cap 25, a limiting block is fixedly arranged in the clamping groove and connected to the end wall outside the through hole of the clamping groove, a spring 23 is arranged between the limiting block and the through hole wall of the clamping groove, a plug rod 26 is connected to the clamping cap 25, and a clamping groove 27 corresponding to the plug rod 26 is arranged on the sampling body 41, when the connecting sleeve 20 is installed on the sampling body 41, first pull the clamping cap 25 outward, the clamping cap 25 drives the plug rod 26 to move outward, at this time the connecting sleeve 20 is screwed on the sampling body 41, after the connecting sleeve 20 is installed on the sampling body 41, the clamping cap 25 can be released, when the plug rod 26 of the connecting sleeve 20 corresponds to the clamping groove 27, the spring 23 can push the plug rod 26 into the clamping groove 27, at this time the connecting sleeve 20 and the sampling body 41 are fixed to each other, the cooperation of the plug rod 26 and the clamping groove 27 can prevent the connecting sleeve 20 from falling off the sampling body 41.

[0049] The connecting sleeve 20 and the sampling body 41 can be provided with corresponding matching grooves and protrusions, facilitating the connection of the sampling body 41 and the connecting sleeve 20 as a reference. After the connecting sleeve 20 is sleeved on the sampling body 41, the plug rod 26 will be inserted into the clamping groove 27 under the action of the spring 23 when the connecting sleeve 20 is installed in the correct position on the sampling body 41

[0050] In other embodiments, the connecting sleeve 20 can be selected and screwed onto the sampling body 41. The outer surface of the sampling body 41 and the inner surface of the connecting sleeve 20 are provided with corresponding matching threads, and the connecting sleeve 20 is screwed onto the sampling body 41 by thread cooperation.

[0051] The connecting sleeve 20 is provided with an exhaust structure, such as an exhaust hole 44, which can filter toxic gases in time. Customers can equip the exhaust structure with activated carbon adsorption devices according to their needs. The outer side of the connecting sleeve 20 can be provided with a plurality of recessed grooves to facilitate the rotation of the connecting sleeve 20 by workers.

[0052] The connecting sleeve 20 is provided with a sealing ring 19 at both ends, which is arranged on the two connecting surfaces of the connecting sleeve 20, so as to respectively maintain the sealing between the connecting sleeve 20 and the sampling body 41, and the sealing between the connecting sleeve 20 and the sampling bottle 21, preventing the leakage of the medium sampling medium.

[0053] The connecting sleeve 20 and the sampling bottle 21 can be connected by thread cooperation. The outer surface of the sampling bottle 21 is provided with threads, and the inner surface of the connecting sleeve 20 is provided with threads, so that the sampling bottle 21 and the connecting sleeve 20 are connected by threads. The connecting sleeve 20 and the sampling bottle 21 are connected together in advance, and then integrally connected to the sampling body 41. The connecting sleeve 20 is provided with a transition channel corresponding to the sampling channel 42. After the medium flows into the sampling channel 42, it directly enters the sampling bottle 21 through the transition channel. After sampling is completed, the user pulls out the clamping cap 25, pulls out the plug rod 26 from the clamping groove 27, rotates the connecting sleeve 20, and removes the connecting sleeve 20 and the sampling bottle 21 from the sampling body 41, which can complete the sampling. At the same time, a spare connecting sleeve 20 is loaded on the sampling body 41, or a closed cap is directly screwed in.

[0054] The sampling valve of the above technical scheme is applicable to a range of ≤100 mm in diameter, a pressure range of ≤1.6 MPa, and a temperature of ≤300°C in the polyester industry, such as ester exchange reaction of polyester fiber, diphenyl carbonate, phenol and other media.

[0055] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A low-residue Y-shaped heat-insulating sampling device, characterized in that: The nut mounting bracket is provided on the lower side of the valve body, and double-headed columns are provided on both sides between the nut mounting bracket and the valve body. A limiting ring is fixedly provided on the upper side of the double-headed column on one side of the column, and an opening limiting ring is fixedly provided on the lower side of the double-headed column on the other side. A connecting block is provided on the valve stem, and a handle is provided on the connecting block. The handle abuts against the double-headed columns on both sides. When the handle abuts against the closing limiting ring, the valve stem head fits against the valve body flow channel. When the handle abuts against the opening limiting ring, the valve stem head faces the sampling channel. The valve stem and the center line of the valve body flow channel are eccentrically arranged, and a jacket is provided on the valve body flow channel and the outside of the valve body main body.

2. A low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: A gap is provided between the jacket, the valve body flow channel and the valve body, and the gap between the jacket, the valve body flow channel and the valve body is filled with a heat-insulating medium.

3. A low-residue Y-shaped heat-insulating sampling device according to claim 2, characterized in that: The jacket is disposed outside the sampling body.

4. A low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: The lowest point of the arc-shaped structure of the valve stem head is higher than the lowest point of the pipe wall of the valve body flow channel.

5. A low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: The sampling body is tilted downward from one side fixedly connected to the valve body to the other side.

6. A low-residue Y-shaped heat-insulating sampling device according to claim 5, characterized in that: The sampling channel is tangent to the arcuate surface of the valve stem head facing the sampling channel.

7. The low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: Both ends of the double-headed column are stepped structures.

8. The low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: A light plane bearing is provided between the upper and lower side surfaces of the valve stem nut and the nut mounting frame, and a shaft retaining spring is fixedly provided on the outside of the light plane bearing on the nut mounting frame.

9. The low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: An annular sleeve is fixedly provided on the lower side of the valve stem nut, and a hand wheel is fixedly provided on the annular sleeve.

10. The low-residue Y-shaped heat-insulating sampling device according to claim 1, characterized in that: The sampling body is connected with a connecting sleeve, the other end of the connecting sleeve is provided with a sampling bottle, and a sealing ring is provided on the section where the connecting sleeve is connected with the sampling body and the sampling bottle.

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