Corrosion-resistant pipeline joint for electronic grade hydrochloric acid analysis

Abstract

The invention relates to the technical field of pipeline joints, and discloses a corrosion-resistant pipeline joint for electronic grade hydrochloric acid desorption, which comprises a joint pipe, and the upper end and the lower end of the joint pipe are respectively provided with an inlet and an outlet; the telescopic communication assembly is used for performing staggered flow communication on the hydrochloric acid liquid; the pressure self-flushing mechanism is used for automatically flushing the joint pipe; the telescopic communication assembly comprises an upper contracted pipe, and the upper contracted pipe is connected to the inner wall of the connector pipe in a sliding mode. According to the corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis, through the arranged telescopic communication assembly, when sulfuric acid in a pipeline is communicated, the extrusion force of fluid can be used for driving the upper contracted pipe and the lower contracted pipe to move relatively, so that a fluid channel of hydrochloric acid is formed, and after the fluid pressure of hydrochloric acid disappears, the upper contracted pipe and the lower contracted pipe are in a reset state; acid liquid attached to the pipe wall can be automatically cleaned, so that pipeline corrosion caused by attachment of hydrochloric acid is reduced, and the overall service life of the connector is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline joints, and particularly to a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid desorption. Background Art

[0002] At present, domestic chemical enterprises produce HCl gas in processes such as the hydrolysis and combustion of chlorosilane to prepare fumed silica, and the thermal condensation of chlorobenzene and trichlorosilane to prepare phenyltrichlorosilane. To meet the emission standards of system tail gas, water absorption towers are mainly used for scrubbing to obtain a large amount of by-product hydrochloric acid. Hydrochloric acid is desorbed of HCl through a hydrochloric acid desorption device, and HCl gas is recovered through a conventional desorption tower, which can be supplied to a polysilicon reduction furnace for the hydrogen reduction reaction of trichlorosilane.

[0003] Currently, during the hydrochloric acid desorption process, pipelines are required for transportation, and pipelines are connected through pipeline joints. However, during the long-term use of hydrochloric acid flowing, the hydrochloric acid remaining or accumulating on the pipeline joints will gradually corrode the joints, easily causing subsequent sealing failure and leakage problems. In the existing technology, basically, after the experiment or desorption is completed, an external water pipe is connected to flush it to wash away the hydrochloric acid solution attached to the joints. However, this method is too cumbersome and requires operators to change the pipeline of the joint to connect the water pipe, making the operation extremely inconvenient. Therefore, a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid desorption is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid desorption, which solves the problem that the hydrochloric acid solution attached to the surface of the pipeline joint in the prior art will cause acidic corrosion of the pipeline joint during long-term use, resulting in a reduction in the sealing performance in the later stage and affecting the use of the joint in the later stage.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: A corrosion-resistant pipeline joint for electronic-grade hydrochloric acid desorption, including a joint pipe, with an inlet and an outlet respectively opened at the upper and lower ends of the joint pipe; a telescopic connection assembly for alternately flowing and connecting hydrochloric acid liquid; a pressure self-flushing mechanism for self-flushing the joint pipe; the telescopic connection assembly includes an upper shrinkage pipe, which is slidably connected to the inner wall of the joint pipe, and a lower shrinkage pipe is slidably connected to the surface of the upper shrinkage pipe. The upper shrinkage pipe slides downward under the pressure of hydrochloric acid fluid, and drives the lower shrinkage pipe to move upward through a transmission assembly, forming an alternating movement connection.

[0006] 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 retractable tube, the surface of the lower retractable 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 with a sliding piece, and the sliding piece is slidably connected to the surface of the lower retractable tube.

[0007] Preferably, a pulling sleeve is slidably connected to the inner wall of the upper retractable tube, a pull rod is fixedly connected to the top of the pulling sleeve, and the top of the pull rod is fixedly connected to the inner wall of the joint pipe through a triangular frame.

[0008] Preferably, the pressure self-flushing mechanism includes a suction component and a reset component. The reset component includes a power gear, a power rack is engaged with the power gear, the left end of the power rack is fixedly connected to a piston sleeve, a pressure pipe is fixedly connected to the surface of the joint pipe, the piston sleeve is slidably connected to the inside of the pressure pipe, a compression spring is connected to the left side of the piston sleeve, the power gear is connected to the power gear through a connecting rod, and the power gear is rotatably connected to the inside of the joint pipe through a connecting rod.

[0009] Preferably, the suction component includes a suction pipe, one end of the suction pipe is communicated with the pressure pipe, the other end of the suction pipe is connected to a water tank through a pipeline, a flow cavity is arranged inside the joint pipe, an injection head is connected to the inside of the pressure pipe, one end of the injection head is communicated with the inner cavity of the pressure pipe, the other end of the injection head is communicated with the flow cavity, and a plurality of through holes are formed in the inner wall of the joint pipe, and the through holes are communicated with the flow cavity.

[0010] Preferably, a sealing sleeve is slidably connected to the inside of the flow cavity, and a plurality of drain ports are formed in the sealing sleeve. When the piston sleeve moves to the left, the aqueous solution in the water tank will be sucked through the suction pipe, and then through the rightward movement of the piston sleeve, the aqueous solution will be injected into the inside of the flow cavity through the injection head.

[0011] Preferably, one-way valves are arranged inside both the suction pipe and the injection head, and there are two groups of suction components, and the two groups of suction components are symmetrically distributed with the center line of the joint pipe as the axis of symmetry.

[0012] Preferably, a pressure display component is further included. The pressure display component includes a dial, the dial is fixed on the joint pipe, a pointer is rotatably connected to the dial, the pointer is fixedly connected to a connecting gear through a shaft rod, a moving rack is engaged with the connecting gear, one end of the moving rack is connected to the top of the upper retractable tube, and the bottom of the moving rack is connected to the sliding piece.

[0013] Preferably, the top of the upper shrinkage pipe and the bottom of the lower shrinkage pipe are in a funnel shape, and stainless steel round sleeves are connected to the funnel-shaped end faces of the upper shrinkage pipe and the lower shrinkage pipe. The stainless steel round sleeves are slidably connected to the inner wall of the joint pipe.

[0014] Preferably, ceramic coatings are sprayed on the inner walls of the joint pipe, the upper shrinkage pipe and the lower shrinkage pipe.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis, which has the following beneficial effects: 1. For the corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis, through the telescopic connection component provided, when sulfuric acid is connected in the pipeline, the relative movement of the upper shrinkage pipe and the lower shrinkage pipe can be driven by the extrusion force of the fluid, so as to form a fluid channel for hydrochloric acid. After the hydrochloric acid fluid pressure disappears, in the reset state, the upper shrinkage pipe and the lower shrinkage pipe can automatically clean the acidic liquid attached to the pipe wall, thereby reducing the pipeline corrosion caused by the attachment of hydrochloric acid and improving the overall service life of the joint.

[0016] 2. For the corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis, through the pressure self-flushing mechanism provided, automatic suction of a quantitative aqueous solution can be realized. When there is no hydrochloric acid fluid pressure in the pipeline, it means that the hydrochloric acid analysis has ended. It will automatically inject the sucked aqueous solution onto the pipe wall through the flow cavity by using the principle of an elastic "syringe", so as to realize automatic water washing and flushing, thereby improving the anti-corrosion effect of the whole joint, maximizing the flushing of the hydrochloric acid solution attached to the surface, and realizing the dual effects of self-flushing and self-cleaning of the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 2 FIG. 2 is a schematic diagram of the overall sectional structure of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 3 FIG. 3 is a schematic diagram of the transmission component structure of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 4 FIG. 4 is a schematic diagram of the pressure self-flushing mechanism of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 5 FIG. 5 is a schematic diagram of the connection structure of the upper shrinkage pipe of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 6 FIG. 6 is a partial structure diagram of the lower shrinkage pipe of a corrosion-resistant pipeline joint for electronic-grade hydrochloric acid analysis proposed by the present invention; Figure 7Schematic structural diagram of the pressure display component of a corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis proposed by the present invention.

[0018] In the figure: 1, joint pipe; 2, inlet; 3, pressure self-flushing mechanism; 301, rotating gear; 302, connecting rack; 303, sliding piece; 304, pressure pipe; 305, piston sleeve; 306, compression spring; 307, injection head; 308, flow cavity; 309, sealing sleeve; 310, drain port; 311, through hole; 4, outlet; 5, pull sleeve; 6, pull rod; 7, upper shrinking pipe; 8, pressure display component; 81, dial; 82, pointer; 83, shaft rod; 84, moving rack; 85, connecting gear; 9, lower shrinking pipe; 91, teeth; 10, power tooth rod; 11, power gear; 12, extraction pipe. Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1 - 7, A corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis and resolution, comprising 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 connection assembly for alternately connecting and flowing hydrochloric acid liquid; the telescopic connection assembly includes an upper contraction pipe 7, the upper contraction pipe 7 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 pressed and slides down by the pressure of the hydrochloric acid fluid, and drives the lower contraction pipe 9 to move upward through a transmission assembly, forming an alternating movement connection. The pressure self-flushing mechanism 3 includes a suction assembly and a reset assembly. The reset assembly includes a power gear 11, a power rack 10 is engaged with the power gear 11, the left end of the power rack 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 inside the pressure pipe 304, a compression spring 306 is connected to the left side of the piston sleeve 305, the power gear 11 is connected to the power gear 11 through a connecting rod, and the power gear 11 is rotatably connected inside the joint pipe 1 through a connecting rod. Utilizing the fluid pressure of the solution, the upper contraction pipe 7 will be gradually pushed downward until the funnel end of the upper contraction pipe 7 moves below the pull sleeve 5. At this time, the solution will enter from the internal channel of the upper contraction pipe 7, reach the inside of the lower contraction pipe 9, and then be discharged from the bottom outlet 4 position of the joint pipe 1 to realize the flow of the solution. When the upper contraction pipe 7 moves downward, it will synchronously drive 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 other side-engaged lower contraction pipe 9 to move upward. At this time, the lower contraction pipe 9 and the lower contraction pipe 9 form a relatively contracted state. Because in the contracted state, after the subsequent hydrochloric acid analysis and resolution are completed, the relative reset of the upper contraction pipe 7 and the lower contraction pipe 9 can be used to automatically process the entire inner wall of the joint, and then scrape off the hydrochloric acid solution adhering to the inner wall of the joint, thereby ensuring the maximum cleanliness of the entire pipe wall. And the entire joint can achieve automatic processing, without the need for operators to replace the joint or manually flush it. The overall joint realizes the effects of automatic cleaning and automatic quantitative flushing, maximally improving the overall anti-corrosion effect of the pipe joint, and also avoiding the attachment of some impurities, ensuring the stable connection between the joint and the pipeline, and reducing the problem of seal failure at the joint from the side.

[0021] In this embodiment, the transmission assembly includes a rotating gear 301. One side of the rotating gear 301 meshes with a connecting rack 302. The top of the connecting rack 302 is fixedly connected to the top of the upper shrinking pipe 7. Teeth 91 are fixedly arranged on the surface of the lower shrinking pipe 9. The other side of the rotating gear 301 meshes with the teeth 91. The bottom of the connecting rack 302 is connected to a sliding piece 303. The sliding piece 303 is slidably connected to the surface of the lower shrinking pipe 9. By arranging the transmission assembly, after the upper shrinking pipe 7 moves downward unidirectionally, it can drive the upper movement of the lower shrinking pipe 9, thus forming a relative movement state. Since the inner diameter of the upper shrinking pipe 7 is smaller, the flow rate of hydrochloric acid will be increased to a certain extent, ensuring the normal operation of hydrochloric acid analysis.

[0022] Furthermore, a pulling sleeve 5 is slidably connected to the inner wall of the upper shrinking pipe 7. The top of the pulling sleeve 5 is fixedly connected to a pull rod 6. The top of the pull rod 6 is fixedly connected to the inner wall of the joint pipe 1 through a tripod. The purpose of arranging the pulling sleeve 5 is to provide a temporarily closed space. When the hydrochloric acid solution enters the inner shaft of the joint pipe 1 from the pipeline, using the funnel structure at the top, the hydrochloric acid solution will be guided to provide a squeezing force for the movement of the upper shrinking pipe 7, ensuring that the upper shrinking pipe 7 can slide downward. When the upper shrinking pipe 7 moves downward and disengages from the pulling sleeve 5, the channel inside the upper shrinking pipe 7 will be opened, and the hydrochloric acid solution will flow out from the opened channel to the outlet 4.

[0023] In addition, the suction assembly includes a suction pipe 12. One end of the suction pipe 12 communicates with a pressure pipe 304. The other end of the suction pipe 12 is connected to a water tank through a pipeline. A flow cavity 308 is arranged inside the joint pipe 1. An injection head 307 is connected inside the pressure pipe 304. One end of the injection head 307 communicates with the inner cavity of the pressure pipe 304, and the other end of the injection head 307 communicates with the flow cavity 308. A plurality of through holes 311 are opened on the inner wall of the joint pipe 1, and the through holes 311 communicate with the flow cavity 308. When the upper shrinking pipe 7 and the lower shrinking pipe 9 move, the whole joint will automatically suck aqueous solution. Specifically, when the piston sleeve 305 moves leftward, a negative pressure suction force will be generated through the internal cavity. Then, the aqueous solution inside the water tank will be extracted by the suction pipe 12 and then sucked into the pressure pipe 304 for temporary quantitative storage. After the hydrochloric acid analysis is completed and there is no fluid pressure inside, when the compression spring 306 resets and pushes the piston sleeve 305 to reset, the extracted aqueous solution inside will be squeezed and injected 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 closing sleeve 309, and then be discharged from the overlapping hole positions formed by the drain port 310 and the through holes 311. Therefore, the aqueous solution will be discharged from the positions of the plurality of through holes 311, thereby flushing and cleaning the inner wall surface of the joint pipe 1, and treating the hydrochloric acid adhering liquid again. This greatly avoids the attachment of hydrochloric acid solution to the joint, improves the anti-corrosion effect of the whole joint, and also improves the overall service life of the joint.

[0024] In addition, a sealing sleeve 309 is slidably connected inside the flow chamber 308. A plurality of drain ports 310 are formed in the sealing sleeve 309. When the piston sleeve 305 moves leftward, the aqueous solution in the water tank will be sucked through the suction pipe 12. Then, by moving the piston sleeve 305 rightward, the aqueous solution is injected into the inside of the flow chamber 308 through the injection head 307. Since it is necessary to ensure that the drain port 310 cannot communicate with the through hole 311 when the hydrochloric acid solution flows, otherwise the hydrochloric acid will enter the inside of the flow chamber 308 from the position of the through hole 311 when flowing, the sealing sleeve 309 is provided. Only after the sealing sleeve 309 moves upward will the drain port 310 and the through hole 311 form a matching and overlapping communication state. And the condition for the sealing sleeve 309 to move upward is caused by the upward extrusion of the aqueous solution below. Therefore, when the entire hydrochloric acid solution flows, the position of the through hole 311 is directly blocked by the sealing sleeve 309, and the hydrochloric acid solution will not enter the inside of the flow chamber 308.

[0025] It should be noted that one-way valves are provided inside both the suction pipe 12 and the injection head 307. Two sets of suction components are provided, and the two sets of suction components are symmetrically distributed with the center line of the joint pipe 1 as the axis of symmetry. By providing the one-way valve, it can be avoided that when the piston sleeve 305 is reset and extruded, the aqueous solution inside will be discharged from the position of the suction pipe 12. Utilizing the characteristic of one-way conduction, the aqueous solution can only be discharged from the position of the injection head 307, providing certain assistance for subsequent flushing.

[0026] Furthermore, there is a pressure display component 8. The pressure display component 8 includes a dial 81. The dial 81 is fixed on the joint pipe 1. A pointer 82 is rotatably connected to the dial 81. The pointer 82 is fixedly connected to a connecting gear 85 through a shaft rod 83. A moving rack 84 is engaged with the connecting gear 85. One end of the moving rack 84 is connected to the top of the upper contraction pipe 7, and the bottom of the moving rack 84 is connected to the sliding piece 303. When the upper contraction pipe 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. By using the meshing transmission of the gear and the rack again, it 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 rod 83. Therefore, the operator can view the downward movement distance of the upper contraction pipe 7 at this time according to the rotation state of the pointer 82. Because after the upper contraction pipe 7 moves downward to a certain distance, that is, after it is separated from the pulling sleeve 5, the fluid passage can be opened. If there is a leakage in the internal sealing, at this time, when the upper contraction pipe 7 moves downward and the hydrochloric acid flows, the pointer 82 will gradually rotate and reset. Therefore, the operator can directly judge whether the internal sealing of the joint is intact according to the rotation of the pointer 82, avoiding the situation where the operator cannot quickly know when there is a solution leakage.

[0027] Furthermore, the top of the upper constriction tube 7 and the bottom of the lower constriction tube 9 are in a funnel shape, and stainless steel sleeves are connected to the funnel-shaped end faces of the upper constriction tube 7 and the lower constriction tube 9. The stainless steel sleeves are slidably connected to the inner wall of the joint pipe 1. Since hydrochloric acid hardly reacts with stainless steel, and the funnel-shaped structure needs to slide reciprocally for a long time, the use of stainless steel sleeves can improve the reciprocating motion stability of the upper constriction tube 7 and the lower constriction tube 9, and the funnel-shaped structure can conduct flow. At the same time of conducting flow, a certain extrusion force will be generated to provide the downward pressing force for the integrated structure of the funnel and the upper constriction tube 7.

[0028] In addition, the inner walls of the joint pipe 1, the upper constriction tube 7 and the lower constriction tube 9 are all sprayed with ceramic coatings. The overall anti-corrosion performance of the joint can be further improved by the sprayed ceramic coatings, because the characteristics of the ceramic coatings are high hardness, wear resistance, high temperature resistance > 1000°C, and strong corrosion resistance, which are suitable for some acidic pipelines.

[0029] With the above structure, the working principle of this case is that during the hydrochloric acid analysis process, the hydrochloric acid solution will surely flow through the pipeline and enter the interior of the joint pipe 1 from the upper inlet 2 of the joint pipe 1. At this time, due to the blockage of the pull sleeve 5, the solution will gradually fill the top space of the upper constriction pipe 7. After that, when the solution is continuously injected, using the fluid pressure of the solution, the upper constriction pipe 7 will be gradually pushed downward until the funnel end of the upper constriction pipe 7 moves below the pull sleeve 5. Only then will the solution enter from the internal channel of the upper constriction pipe 7, enter the interior of the lower constriction pipe 9, and then be discharged from the bottom outlet 4 of the joint pipe 1 to achieve the circulation of the solution. When the upper constriction pipe 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. The rotation of the rotating gear 301 will drive the meshing lower constriction pipe 9 on the other side to move upward in the reverse direction. At this time, the lower constriction pipe 9 and the lower constriction pipe 9 form a relatively contracted state. Because in the contracted state, after the subsequent hydrochloric acid analysis is completed, using the relative reset of the upper constriction pipe 7 and the lower constriction pipe 9, the entire inner wall of the joint can be automatically processed, 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 power gear 11 to rotate through the connecting rod, and then, through the meshing relationship of the gear and the toothed rod again, control the leftward movement of the power toothed rod 10. The leftward sliding of the power toothed rod 10 will push the piston sleeve 305 to move leftward and compress the compression spring 306. Therefore, 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 constriction pipe 7. When there is no solution pressure at the inlet 2, the compression spring 306 will push the piston sleeve 305 to return elastically. Through the reverse principle, it will control the relative reset movement of the upper constriction pipe 7 and the lower constriction pipe 9. At this time, the funnel end face will slide on the inner wall of the joint pipe 1, so as to automatically scrape the hydrochloric acid solution attached to the inner wall. Moreover, when the upper constriction pipe 7 moves upward, the position of the pull sleeve 5 remains fixed. Therefore, in the relative state, the pull sleeve 5 will also synchronously clean the inner wall of the upper constriction pipe 7 to avoid the attachment of hydrochloric acid solution. The scraped hydrochloric acid solution will flow out along the inner wall towards the outlet 4, thereby improving the anti-corrosion effect of the entire joint.In order to further improve the anti-corrosion effect of the joint, when the upper reducing pipe 7 and the lower reducing pipe 9 move, the entire joint will automatically suck the aqueous solution. Specifically, when the piston sleeve 305 moves leftward, a negative pressure suction will be generated through the internal cavity. Then, the aqueous solution inside the water tank will be extracted by the suction pipe 12 and then sucked into the inside of the pressure pipe 304 for temporary quantitative storage. After the hydrochloric acid analysis is completed and there is no fluid pressure inside, as the compression spring 306 resets and pushes the piston sleeve 305 to reset, the aqueous solution extracted inside will be squeezed and injected into the inside of the flow chamber 308 from the position of the injection head 307. Then, the aqueous solution will gradually fill the flow chamber 308. After that, the water pressure is used again to lift the sealing sleeve 309 a small distance, so that the drain port 310 and the through hole 311 are in a coincident state. At this time, the aqueous solution will flow into the sliding cavity of the sealing sleeve 309 and then be discharged from the coincident hole position formed by the drain port 310 and the through hole 311. Therefore, the aqueous solution will be discharged from the positions of multiple through holes 311 at this time, thereby flushing and cleaning the inner wall surface of the joint pipe 1 and treating the hydrochloric acid adhering liquid again. The flushed solution will automatically drain from the position of the outlet 4 through the channel formed by the upper reducing pipe 7 and the lower reducing pipe 9. Therefore, the automatic suction and quantitative aqueous solution flushing of the inner wall of the joint and the scraping treatment of the automatic reciprocating motion are realized as a whole, greatly avoiding the attachment of hydrochloric acid solution to the joint, improving the anti-corrosion effect of the entire joint and also improving the overall service life of the joint. And a pressure display component 8 is also provided on the entire joint to always display whether there is pressure loss in the fluid inside the joint pipe 1. When the upper reducing pipe 7 moves downward, it will synchronously drive the sliding piece 303 to move downward. The downward movement of the sliding piece 303 will drive the moving rack 84 to move downward. By using the meshing transmission of the gear and the rack again, the rotation of the connecting gear 85 will be driven. The rotation of the connecting gear 85 will drive the rotation of the pointer 82 through the shaft rod 83. Therefore, the operator can view the downward movement distance of the upper reducing pipe 7 at this time according to the rotation state of the pointer 82. Because after the upper reducing pipe 7 moves downward a certain distance, that is, after it is separated from the pulling sleeve 5, the fluid channel can be opened. If there is a leakage in the internal sealing performance, when the upper reducing pipe 7 moves downward and the hydrochloric acid flows, the pointer 82 will gradually rotate and reset. Therefore, the operator can directly judge whether the internal sealing performance of the joint is intact according to the rotation of the pointer 82, which is convenient for the subsequent overall maintenance and repair of the joint.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis and separation, comprising a joint pipe (1), characterized in that, The upper and lower ends of the joint pipe (1) are respectively provided with an inlet (2) and an outlet (4); A telescopic connection assembly for enabling the hydrochloric acid liquid to flow in an interleaved manner; A pressure self-flushing mechanism (3) for self-flushing the joint pipe (1); The telescopic connection assembly includes an upper contraction pipe (7) which is slidably connected to the inner wall of the joint pipe (1). A lower contraction pipe (9) is slidably connected to the surface of the upper contraction pipe (7). The upper contraction pipe (7) slides downward under the pressure of the hydrochloric acid fluid, and drives the lower contraction pipe (9) to move upward through a transmission assembly, forming an interleaved movement connection; The pressure self-flushing mechanism (3) includes a suction assembly and a reset assembly. The reset assembly includes a power gear (11). A power rack (10) is engaged with the power gear (11). The left end of the power rack (10) is fixedly connected to a piston sleeve (305). A pressure pipe (304) is fixedly connected to the surface of the joint pipe (1). 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 connected to the power gear (11) through a connecting rod, 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 pipe (12). One end of the suction pipe (12) is communicated with the pressure pipe (304). The other end of the suction pipe (12) is connected to a water tank through a pipeline. A flow cavity (308) is arranged inside the joint pipe (1). An injection head (307) is connected to the inside of the pressure pipe (304). One end of the injection head (307) is communicated with the inner cavity of the pressure pipe (304), and the other end of the injection head (307) is communicated with the flow cavity (308). A plurality of through holes (311) are formed in the inner wall of the joint pipe (1), and the through holes (311) are communicated with the flow cavity (308); 2. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, wherein: The transmission assembly includes a rotating gear (301). A connecting rack (302) is engaged with one side of the rotating gear (301). The top of the connecting rack (302) is fixedly connected to the top of the upper contraction pipe (7). Teeth (91) are fixedly arranged on the surface of the lower contraction pipe (9). The other side of the rotating gear (301) is engaged with the teeth (91). The bottom of the connecting rack (302) is connected to a sliding piece (303), and the sliding piece (303) is slidably connected to the surface of the lower contraction pipe (9); 3. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: A pull sleeve (5) is slidably connected to the inner wall of the upper contraction pipe (7). A pull rod (6) is fixedly connected to the top of the pull sleeve (5). The top of the pull rod (6) is fixedly connected to the inner wall of the joint pipe (1) through a tripod; 4. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: A sealing sleeve (309) is slidably connected inside the flow chamber (308). A plurality of drain ports (310) are formed in the sealing sleeve (309). When the piston sleeve (305) moves leftward, the aqueous solution in the water tank will be suctioned through the suction pipe (12). Then, by the rightward movement of the piston sleeve (305), 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: Check valves are provided inside both the suction pipe (12) and the injection head (307). There are two sets of suction assemblies, and the two sets of suction assemblies are symmetrically distributed with the center line of the joint pipe (1) as the axis of symmetry.

6. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 2, wherein: It further includes a pressure display assembly (8). The pressure display assembly (8) includes a dial (81). The dial (81) is fixed on the joint pipe (1). A pointer (82) is rotatably connected to the dial (81). The pointer (82) is fixedly connected to a connecting gear (85) through a shaft rod (83). A moving rack (84) is engaged with the connecting gear (85). One end of the moving rack (84) is connected to the top of the upper contraction pipe (7), and the bottom of the moving rack (84) is connected to the sliding piece (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 contraction pipe (7) and the bottom of the lower contraction pipe (9) are in a funnel shape, and stainless steel round sleeves are connected to the funnel-shaped end faces of the top of the upper contraction pipe (7) and the bottom of the lower contraction pipe (9). The stainless steel round sleeves are slidably connected to the inner wall of the joint pipe (1).

8. The corrosion-resistant pipe joint for electronic-grade hydrochloric acid analysis according to claim 1, characterized in that: Ceramic coatings are sprayed on the inner walls of the joint pipe (1), the upper contraction pipe (7), and the lower contraction pipe (9).

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