A corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis

Abstract

The present invention relates to the technical field of pipe joints, and discloses a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, comprising a joint pipe, wherein the upper and lower ends of the joint pipe are respectively provided with an inlet and an outlet; a telescopic connecting component for staggered flow connection of hydrochloric acid liquid; a pressure self-flushing mechanism for self-flushing the joint pipe; the telescopic connecting component comprises an upper contraction pipe, and the upper contraction pipe is slidably connected to the inner wall of the joint pipe. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, through the telescopic connecting component, can utilize the squeezing force of the fluid to drive the relative movement of the upper contraction pipe and the lower contraction pipe when sulfuric acid is connected in the pipeline, thereby forming a fluid channel for hydrochloric acid. When the hydrochloric acid fluid pressure disappears, the upper contraction pipe and the lower contraction pipe can automatically clean the acidic liquid attached to the pipe wall in the reset state, thereby reducing pipeline corrosion caused by the adhesion of hydrochloric acid and improving the overall service life of the joint.

Description

Technical Field

[0001] The invention relates to the technical field of pipe joints, in particular to a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis. Background Art

[0002] Currently, domestic chemical companies generate HCl gas through processes such as the hydrolysis and combustion of chlorosilane to produce fumed silica, the thermal contraction of chlorobenzene and trichlorosilane, and the production of phenyltrichlorosilane. To ensure that system exhaust emissions meet standards, this is primarily removed through elution in water absorption towers, resulting in large amounts of hydrochloric acid as a byproduct. The hydrochloric acid is separated out through a hydrochloric acid desorption unit, and the HCl gas is recovered through hydrochloric acid desorption in a conventional desorption tower and supplied to the polysilicon reduction furnace for the trichlorosilane hydrogen reduction reaction.

[0003] At present, hydrochloric acid analysis requires pipeline transportation, and the pipelines are connected by pipeline joints. However, during the flow of hydrochloric acid, after long-term use, the hydrochloric acid remaining or accumulated on the pipeline joints will gradually corrode the joints, which can easily cause subsequent seal failure and leakage problems. In the existing technology, after the experiment or analysis is completed, the external water pipe is basically used to flush it to flush the hydrochloric acid solution attached to the joint. However, this method is too cumbersome and requires the operator to change the pipeline of the joint to connect it to the water pipe, which is extremely inconvenient. Therefore, a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, which solves the problem in the existing technology that after hydrochloric acid analysis, the hydrochloric acid solution attached to the surface of the pipe joint will cause acid corrosion of the pipe joint after long-term use, resulting in a decrease in the subsequent sealing performance and affecting the subsequent use of the joint.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, comprising a joint pipe, wherein the upper and lower ends of the joint pipe are respectively provided with an inlet and an outlet; a telescopic connecting component for staggered flow connection of the hydrochloric acid liquid; a pressure self-flushing mechanism for self-flushing the joint pipe; the telescopic connecting component comprises an upper contraction pipe, which is slidably connected to the inner wall of the joint pipe, and the surface of the upper contraction pipe is slidably connected to a lower contraction pipe, the upper contraction pipe is squeezed and slid down by the pressure of the hydrochloric acid fluid, and the lower contraction pipe is driven upward by the transmission component to form a staggered movable connection.

[0008] Preferably, the transmission assembly includes a rotating gear, one side of the rotating gear is engaged with a connecting rack, the top of the connecting rack is fixedly connected to the top of the upper contraction tube, the surface of the lower contraction tube is fixedly provided with teeth, the other side of the rotating gear is engaged with the teeth, the bottom of the connecting rack is connected to a sliding plate, the sliding plate is slidably connected to the surface of the lower contraction tube, and the power gear is connected to the rotating gear through a connecting rod.

[0009] Preferably, the inner wall of the upper shrink tube is slidably connected to a pull sleeve, the top of the pull sleeve is fixedly connected to a pull rod, and the top of the pull rod is fixedly connected to the inner wall of the joint tube through a tripod.

[0010] Preferably, the pressure self-flushing mechanism includes a suction component and a reset component, the reset component includes a power gear, a power gear is meshed with a power gear rod, the left end of the power gear rod is fixedly connected to a piston sleeve, the surface of the joint pipe is fixedly connected to a pressure pipe, the piston sleeve is slidably connected to the inside of the pressure pipe, the left side of the piston sleeve is connected to a compression spring, and the power gear is rotatably connected to the inside of the joint pipe through a connecting rod.

[0011] Preferably, the suction assembly includes a suction tube, one end of the suction tube is connected to the pressure tube, and the other end of the suction tube is connected to the water tank through a pipe. A flow cavity is provided inside the connecting tube, and an injection head is connected to the inside of the pressure tube. One end of the injection head is connected to the internal cavity of the pressure tube, and the other end of the injection head is connected to the flow cavity. A plurality of through holes are opened on the inner wall of the connecting tube, and the through holes are connected to the flow cavity.

[0012] Preferably, the interior of the flow chamber is slidably connected to a closing sleeve, which is provided with a plurality of drainage ports. When the piston sleeve moves to the left, the aqueous solution in the water tank will be sucked out through the suction tube, and then the piston sleeve will move to the right to inject the aqueous solution into the interior of the flow chamber through the injection head.

[0013] Preferably, one-way valves are provided inside the suction tube and the injection head, and two groups of suction components are provided, and the two groups of suction components are symmetrically distributed with the center line of the joint pipe as the symmetry axis.

[0014] Preferably, a pressure display assembly is also included, the pressure display assembly includes a dial, the dial is fixed on the joint tube, a pointer is rotatably connected to the dial, the pointer is fixedly connected to a connecting gear through an axle rod, a movable rack is engaged on the connecting gear, one end of the movable rack is connected to the top of the upper shrink tube, and the bottom of the movable rack is connected to the sliding plate.

[0015] Preferably, the top of the upper shrinkage tube and the bottom of the lower shrinkage tube are funnel-shaped, and the funnel-shaped end surfaces of the top of the upper shrinkage tube and the lower shrinkage tube are connected with stainless steel round sleeves, and the stainless steel round sleeves are slidably connected to the inner wall of the joint pipe.

[0016] Preferably, the inner walls of the joint pipe, the upper shrinkage pipe and the lower shrinkage pipe are all sprayed with a ceramic coating.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, which has the following beneficial effects:

[0019] 1. This corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, through the provision of a telescopic connecting component, can utilize the extrusion force of the fluid to drive the relative movement of the upper and lower contraction tubes when sulfuric acid is connected in the pipeline, thereby forming a fluid channel for hydrochloric acid. When the hydrochloric acid fluid pressure disappears, the upper and lower contraction tubes can automatically clean the acidic liquid attached to the pipe wall in the reset state, thereby reducing pipeline corrosion caused by the adhesion of hydrochloric acid and increasing the overall service life of the joint.

[0020] 2. This corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis can automatically pump a fixed amount of aqueous solution through the set pressure self-flushing mechanism. When there is no hydrochloric acid fluid pressure in the pipeline, it means that the hydrochloric acid analysis has ended. It will automatically use the principle of elastic "syringe" to inject the pumped aqueous solution into the pipe wall through the flow cavity to achieve automatic water washing, thereby improving the anti-corrosion effect of the entire joint, maximizing the flushing of hydrochloric acid solution attached to the surface, and achieving the two-way effect of self-flushing and self-cleaning of the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the overall cross-sectional structure of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the transmission assembly structure of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of a pressure self-flushing mechanism for a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the shrink tube connection structure of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0026] Figure 6 This is a partial structural diagram of a reduction tube of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention;

[0027] Figure 7 This is a schematic structural diagram of a pressure display component of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention.

[0028] In the figure: 1. Connecting pipe; 2. Inlet; 3. Pressure self-flushing mechanism; 301. Rotating gear; 302. Connecting rack; 303. Sliding plate; 304. Pressure pipe; 305. Piston sleeve; 306. Compression spring; 307. Injection head; 308. Flow chamber; 309. Closing sleeve; 310. Drain outlet; 311. Through hole; 4. Outlet; 5. Pull sleeve; 6. Pull rod; 7. Upper reduction tube; 8. Pressure display assembly; 81. Dial; 82. Pointer; 83. Shaft; 84. Moving rack; 85. Connecting gear; 9. Lower reduction tube; 91. Teeth; 10. Power gear rod; 11. Power gear; 12. Pumping tube. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7A corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis comprises a joint pipe 1, with an inlet 2 and an outlet 4 respectively provided at the upper and lower ends of the joint pipe 1; a telescopic connecting assembly for interlaced flow connection of the hydrochloric acid liquid; the telescopic connecting assembly comprises an upper contraction pipe 7, which is slidably connected to the inner wall of the joint pipe 1, and a lower contraction pipe 9 is slidably connected to the surface of the upper contraction pipe 7. The upper contraction pipe 7 is squeezed downward by the pressure of the hydrochloric acid fluid, and the lower contraction pipe 9 is driven upward by the transmission assembly to form an interlaced movable connection. The pressure self-flushing mechanism 3 comprises a suction assembly and a reset assembly. The reset assembly comprises a power gear 11, a power gear rod 10 is meshed on the power gear 11, and a piston sleeve 305 is fixedly connected to the left end of the power gear rod 10. A pressure pipe 304 is fixedly connected to the surface of the joint pipe 1, and the piston sleeve 305 is slidably connected to the inside of the pressure pipe 304. A compression spring 306 is connected to the left side of the piston sleeve 305. The power gear 11 is rotatably connected to the inside of the joint pipe 1 via a connecting rod. By utilizing the fluid pressure of the solution, the upper contraction tube 7 will be gradually pushed downward until the funnel end of the upper contraction tube 7 moves to the bottom of the pull sleeve 5. At this time, the solution will enter from the internal channel of the upper contraction tube 7, into the interior of the lower contraction tube 9, and then be discharged from the bottom outlet 4 of the joint tube 1 to realize the circulation of the solution. When the upper contraction tube 7 moves downward, it will synchronously drive the two connecting racks 302 to move downward. Through the meshing relationship of the gears, it will drive the rotating gear 301 to rotate, and the rotation of the rotating gear 301 will reversely drive the meshing lower contraction tube 9 on the other side to move upward. At this time, the lower contraction tube 9 and the upper contraction tube 7 form a relatively contracted state, because in the contracted state, After the subsequent hydrochloric acid analysis is completed, the upper shrink tube 7 and the lower shrink tube 9 can be relatively reset to automatically process the entire inner wall of the joint, and then the hydrochloric acid solution attached to the inner wall of the joint can be scraped off, thereby ensuring that the entire pipe wall is clean to the greatest extent. The entire joint can be automatically processed without the need for operators to change the joint or manually flush it. The overall joint achieves the effect of automatic cleaning and automatic quantitative flushing, maximizes the overall anti-corrosion effect of the pipeline joint, and can also avoid the adhesion of some impurities, ensure the stable connection between the joint and the pipeline, and reduce the problem of sealing failure at the joint from the side.

[0031] In this embodiment, the transmission assembly includes a rotating gear 301, one side of which is meshed with a connecting rack 302, the top of which is fixedly connected to the top of the upper contraction tube 7, and the surface of the lower contraction tube 9 is fixedly provided with teeth 91. The other side of the rotating gear 301 is meshed with the teeth 91, and the bottom of the connecting rack 302 is connected to a sliding piece 303, which is slidably connected to the surface of the lower contraction tube 9. The power gear 11 is connected to the rotating gear 301 via a connecting rod. The transmission assembly is configured to drive the lower contraction tube 9 to move upward after the upper contraction tube 7 moves downward unilaterally, thereby forming a state of relative motion. Since the diameter of the upper contraction tube 7 is relatively small, the flow rate of the hydrochloric acid will be increased to a certain extent, ensuring the normal operation of the hydrochloric acid analysis.

[0032] Furthermore, the inner wall of the upper contraction tube 7 is slidably connected to a pull sleeve 5, and the top of the pull sleeve 5 is fixedly connected to a pull rod 6, and the top of the pull rod 6 is fixedly connected to the inner wall of the joint tube 1 through a tripod. The purpose of the setting of the pull sleeve 5 is to provide a temporarily closed space. When the hydrochloric acid solution enters the internal axis of the joint tube 1 from the pipeline, the funnel structure on the top will guide the hydrochloric acid solution, providing a moving extrusion force for the upper contraction tube 7, ensuring that the upper contraction tube 7 can slide downward. When the upper contraction tube 7 moves downward and separates from the pull sleeve 5, the channel inside the upper contraction tube 7 will be opened, and the hydrochloric acid solution will flow out from the opened channel to the outlet 4.

[0033] In addition, the suction assembly includes a suction tube 12, one end of which is connected to the pressure tube 304, and the other end of the suction tube 12 is connected to the water tank through a pipe. A flow cavity 308 is provided inside the connecting tube 1, and an injection head 307 is connected to the inside of the pressure tube 304. One end of the injection head 307 is connected to the internal cavity of the pressure tube 304, and the other end of the injection head 307 is connected to the flow cavity 308. A plurality of through holes 311 are opened on the inner wall of the connecting tube 1, and the through holes 311 are connected to the flow cavity 308. When the upper and lower contraction tubes 7 and 9 move, the entire joint will automatically draw in the aqueous solution. Specifically, when the piston sleeve 305 moves to the left, a negative pressure suction force will be generated through the internal cavity. The aqueous solution in the water tank will then be drawn by the suction tube 12 and then drawn into the interior of the pressure tube 304 for temporary quantitative storage. After the hydrochloric acid decomposition is completed and there is no fluid pressure inside, the compression spring 306 will reset, pushing the piston sleeve 305 to reset and squeezing the aqueous solution drawn from the inside into the flow cavity 308 from the position of the injection head 307. At this time, the aqueous solution will flow into the sliding cavity of the sealing sleeve 309 and then be discharged from the overlapping hole formed by the drain port 310 and the through hole 311. Therefore, the aqueous solution will be discharged from the position of the multiple through holes 311, thereby flushing and cleaning the inner wall surface of the joint pipe 1 and treating the hydrochloric acid attached liquid again, greatly avoiding the hydrochloric acid solution from adhering to the joint, improving the corrosion resistance of the entire joint and increasing the overall service life of the joint.

[0034] In addition, a sealing sleeve 309 is slidably connected to the interior of the flow chamber 308. The sealing sleeve 309 is provided with multiple drain ports 310. When the piston sleeve 305 moves left, the aqueous solution in the water tank is sucked out through the suction tube 12. Then, when the piston sleeve 305 moves right, the aqueous solution is injected into the flow chamber 308 through the injection head 307. To ensure that the drain ports 310 cannot communicate with the through-holes 311 during the flow of the hydrochloric acid solution, otherwise the hydrochloric acid would enter the flow chamber 308 through the through-holes 311, the sealing sleeve 309 is provided. Only when the sealing sleeve 309 moves upward can the drain ports 310 and the through-holes 311 form a matching, overlapping, and connected state. The condition for the sealing sleeve 309 to move upward is the upward squeezing of the aqueous solution below. Therefore, when the hydrochloric acid solution flows, the through-holes 311 are directly blocked by the sealing sleeve 309, preventing the hydrochloric acid solution from entering the flow chamber 308.

[0035] It's worth noting that both the suction tube 12 and the injection head 307 are equipped with one-way valves. Two sets of suction assemblies are provided, symmetrically arranged about the centerline of the connector tube 1. These one-way valves prevent the aqueous solution inside from being expelled from the suction tube 12 when the piston sleeve 305 is repositioned and squeezed. By utilizing their one-way conduction properties, the aqueous solution can only be expelled from the injection head 307, providing some assistance for subsequent flushing.

[0036] Furthermore, the pressure display component 8 includes a dial 81, which is fixed on the joint tube 1. The dial 81 is rotatably connected to a pointer 82, and the pointer 82 is fixedly connected to a connecting gear 85 through an axis 83. A movable rack 84 is engaged on the connecting gear 85, and one end of the movable rack 84 is connected to the top of the upper shrink tube 7, and the bottom of the movable rack 84 is connected to the sliding sheet 303. When the upper shrink tube 7 moves downward, it will synchronously drive the sliding piece 303 to move downward, and the downward movement of the sliding piece 303 will drive the moving rack 84 to move downward. The meshing transmission of the gear and the rack will drive the rotation of the connecting gear 85, and the rotation of the connecting gear 85 will drive the rotation of the pointer 82 through the shaft 83. Therefore, the operator can check the downward movement distance of the upper shrink tube 7 at this time according to the rotation state of the pointer 82. Because the fluid channel can be opened only after the upper shrink tube 7 moves down to a certain distance, that is, after it is separated from the pull sleeve 5, if the internal sealing leaks, at this time, when the upper shrink tube 7 moves downward at a speed and the hydrochloric acid flows, the pointer 82 will gradually rotate and reset. Therefore, the operator can directly judge whether the sealing inside the joint is intact according to the rotation of the pointer 82, to avoid solution leakage, which the operator cannot quickly know.

[0037] Furthermore, the top of the upper contraction tube 7 and the bottom of the lower contraction tube 9 are funnel-shaped, and the funnel-shaped end surfaces of the upper contraction tube 7 and the lower contraction tube 9 are connected to stainless steel round sleeves, which are slidably connected to the inner wall of the joint tube 1. Because hydrochloric acid hardly reacts with stainless steel, and the funnel-shaped structure requires long-term reciprocating sliding, the use of stainless steel round sleeves can improve the reciprocating stability of the upper contraction tube 7 and the lower contraction tube 9. The funnel-shaped structure can also guide the flow, while also generating a certain amount of squeezing pressure, providing the downward thrust of the integrated structure of the funnel and upper contraction tube 7.

[0038] In addition, the inner walls of the joint pipe 1, the upper reduction pipe 7, and the lower reduction pipe 9 are all sprayed with a ceramic coating. The sprayed ceramic coating can further improve the overall corrosion resistance of the joint, because the ceramic coating is characterized by ultra-high hardness, wear resistance, high temperature resistance >1000°C, and strong corrosion resistance, making it suitable for some acidic pipelines.

[0039] With the above structure, the working principle of this case is that during the hydrochloric acid analysis process, the hydrochloric acid solution will definitely flow through the pipeline and will enter the interior of the joint pipe 1 from the upper inlet 2 position of the joint pipe 1. At this time, because of the blocking of the pull sleeve 5, the solution will gradually fill the top space of the upper contraction tube 7. After that, when the solution continues to be injected, the fluid pressure of the solution will gradually push the upper contraction tube 7 downward until the funnel end of the upper contraction tube 7 moves to the bottom of the pull sleeve 5. At this time, the solution will enter from the internal channel of the upper contraction tube 7, to the interior of the lower contraction tube 9, and then be discharged from the bottom outlet 4 position of the joint pipe 1, realizing the circulation of the solution. When the upper contraction tube 7 moves downward, it will synchronously drive the two connecting racks 302 to move downward, and through the meshing relationship of the gears, it will drive the rotating gear 301 to rotate, and the rotation of the rotating gear 301 will reversely drive the meshing lower contraction tube 9 on the other side to move upward. At this time, the lower contraction tube 9 and the upper contraction tube 7 form a relatively contracted state. Because in the contracted state, after the subsequent hydrochloric acid analysis is completed, the relative reset of the upper contraction tube 7 and the lower contraction tube 9 can be used to automatically process the entire inner wall of the joint, and then the hydrochloric acid solution attached to the inner wall of the joint can be scraped off. When the rotating gear 301 rotates, it will drive the rotation of the power gear 11 through the connecting rod, and then again through the meshing relationship between the gear and the rack, control the left movement of the power rack 10, and the left sliding of the power rack 10 will push the piston The leftward movement of the sleeve 305 compresses the compression spring 306, so at this time the fluid pressure of the solution needs to overcome the elastic force of the compression spring 306 to control the downward movement of the upper contraction tube 7. When there is no solution pressure in the inlet 2, the compression spring 306 will push the piston sleeve 305 to perform elastic reset. Through the reverse principle, the relative reset movement of the upper contraction tube 7 and the lower contraction tube 9 will be controlled. At this time, the end face of the funnel will slide from the inner wall of the joint tube 1, thereby self-scraping the hydrochloric acid solution attached to the inner wall, and the position of the pulling sleeve 5 is fixed when the upper contraction tube 7 moves upward. Therefore, in the relative state, the pulling sleeve 5 will also synchronously clean the inner wall of the upper contraction tube 7 to avoid the adhesion of the hydrochloric acid solution. The scraped hydrochloric acid solution will flow out along the inner wall toward the outlet 4, thereby improving the corrosion resistance of the entire joint.In order to further improve the anti-corrosion effect of the joint, the entire joint will automatically suck the aqueous solution when the upper contraction tube 7 and the lower contraction tube 9 move. Specifically, when the piston sleeve 305 moves to the left, a negative pressure suction will be generated through the internal cavity. The internal aqueous solution of the water tank will be extracted by the suction tube 12, and then sucked into the interior of the pressure tube 304 for temporary quantitative storage. After the hydrochloric acid analysis is completed, when there is no fluid pressure inside, the compression spring 306 will be reset, pushing the piston sleeve 305 to reset. At the same time, the extracted aqueous solution will be squeezed from the position of the injection head 307 and injected into the flow cavity 308. After that, the aqueous solution will gradually fill the flow cavity 308, and then the sealing sleeve 309 will be lifted a short distance by water pressure again. , so that the drain port 310 and the through hole 311 are in an overlapping state. At this time, the aqueous solution will flow into the sliding cavity of the sealing sleeve 309, and then be discharged from the overlapping hole position formed by the drain port 310 and the through hole 311. Therefore, the aqueous solution will be discharged from the position of multiple through holes 311, thereby flushing and cleaning the inner wall surface of the joint pipe 1, and processing the hydrochloric acid attached liquid again. The flushed solution will automatically be discharged from the position of the outlet 4 through the channel formed by the upper contraction tube 7 and the lower contraction tube 9. Therefore, the automatic suction of the quantitative aqueous solution flushing and the automatic reciprocating scraping treatment of the inner wall of the joint are realized as a whole, which greatly avoids the hydrochloric acid solution from adhering to the joint, improves the corrosion resistance of the entire joint, and also increases the service life of the entire joint. The entire joint is also provided with a pressure display assembly 8, which is used to constantly display whether there is a loss of pressure in the fluid pressure inside the joint pipe 1. When the upper shrink tube 7 moves downward, it will synchronously drive the sliding plate 303 to move downward, and the downward movement of the sliding plate 303 will drive the moving rack 84 to move downward. The meshing transmission of the gear and the rack will drive the rotation of the connecting gear 85, and the rotation of the connecting gear 85 will drive the rotation of the pointer 82 through the shaft 83. Therefore, the operator can check the downward movement distance of the upper shrink tube 7 at this time according to the rotation state of the pointer 82. Because the fluid channel can only be opened after the upper shrink tube 7 moves down to a certain distance, that is, after it is separated from the pull sleeve 5, if the internal sealing leaks, the pointer 82 will gradually rotate and reset when the upper shrink tube 7 moves downward at a speed and the hydrochloric acid flows. Therefore, the operator can directly judge whether the sealing inside the joint is intact according to the rotation of the pointer 82, thereby facilitating the subsequent overall maintenance and repair of the joint.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis, comprising a joint pipe (1), characterized in that: The joint pipe (1) is provided with an inlet (2) and an outlet (4) at the upper and lower ends respectively; Also included is a telescopic communication component for providing staggered flow communication for the hydrochloric acid liquid; A pressure self-flushing mechanism (3) is used for self-flushing the joint pipe (1); The telescopic connection assembly includes an upper contraction tube (7), the upper contraction tube (7) is slidably connected to the inner wall of the joint tube (1), and the surface of the upper contraction tube (7) is slidably connected to the lower contraction tube (9). The upper contraction tube (7) is squeezed downward by the pressure of the hydrochloric acid fluid, and the lower contraction tube (9) is driven upward by the transmission assembly to form a staggered movable connection; The pressure self-flushing mechanism (3) includes a suction component and a reset component, the reset component includes a power gear (11), a power gear rod (10) is meshed on the power gear (11), the left end of the power gear rod (10) is fixedly connected to a piston sleeve (305), the surface of the joint pipe (1) is fixedly connected to a pressure pipe (304), the piston sleeve (305) is slidably connected to the inside of the pressure pipe (304), the left side of the piston sleeve (305) is connected to a compression spring (306), and the power gear (11) is rotatably connected to the inside of the joint pipe (1) through a connecting rod; The suction assembly includes a suction tube (12), one end of the suction tube (12) is connected to the pressure tube (304), and the other end of the suction tube (12) is connected to the water tank through a pipeline. A flow cavity (308) is provided inside the joint tube (1), and an injection head (307) is connected to the inside of the pressure tube (304). One end of the injection head (307) is connected to the internal cavity of the pressure tube (304), and the other end of the injection head (307) is connected to the flow cavity (308). The inner wall of the joint tube (1) is provided with a plurality of through holes (311), and the through holes (311) are connected to the flow cavity (308).

2. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: The transmission assembly includes a rotating gear (301), one side of the rotating gear (301) is meshed with a connecting rack (302), the top of the connecting rack (302) is fixedly connected to the top of the upper contraction tube (7), the surface of the lower contraction tube (9) is fixedly provided with teeth (91), the other side of the rotating gear (301) is meshed with the teeth (91), the bottom of the connecting rack (302) is connected to a sliding plate (303), the sliding plate (303) is slidably connected to the surface of the lower contraction tube (9), and the power gear (11) is connected to the rotating gear (301) through a connecting rod.

3. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: The inner wall of the upper shrink tube (7) is slidably connected to a pull sleeve (5), the top of the pull sleeve (5) is fixedly connected to a pull rod (6), and the top of the pull rod (6) is fixedly connected to the inner wall of the joint tube (1) via a tripod.

4. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: The interior of the flow chamber (308) is slidably connected to a sealing sleeve (309), and a plurality of drainage ports (310) are provided on the sealing sleeve (309). When the piston sleeve (305) moves to the left, the aqueous solution in the water tank is sucked through the suction tube (12), and then the piston sleeve (305) moves to the right, and the aqueous solution is injected into the interior of the flow chamber (308) through the injection head (307).

5. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 4, characterized in that: One-way valves are provided inside the suction tube (12) and the injection head (307), and two groups of suction components are provided, and the two groups of suction components are symmetrically distributed with the center line of the joint tube (1) as the symmetry axis.

6. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 2, characterized in that: The pressure display assembly (8) further comprises a dial (81), the dial (81) being fixed on the joint tube (1), the dial (81) being rotatably connected to a pointer (82), the pointer (82) being fixedly connected to a connecting gear (85) via a shaft (83), the connecting gear (85) being meshed with a moving rack (84), one end of the moving rack (84) being connected to the top of the upper shrink tube (7), and the bottom of the moving rack (84) being connected to the sliding sheet (303).

7. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: The top of the upper shrink tube (7) and the bottom of the lower shrink tube (9) are funnel-shaped, and the funnel-shaped end surfaces of the top of the upper shrink tube (7) and the lower shrink tube (9) are both connected to stainless steel round sleeves, and the stainless steel round sleeves are slidably connected to the inner wall of the joint tube (1).

8. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: The inner walls of the joint pipe (1), the upper shrinkage pipe (7) and the lower shrinkage pipe (9) are all sprayed with a ceramic coating.

Images