Fool-proof and liquid-leakage-proof dip tube

Abstract

A fool-proof and liquid-leakage-proof dip tube comprises an end cover, an inner plug, a small O-shaped sealing ring, a positioning pin, a codon, a large O-shaped sealing ring, a middle O-shaped sealing ring and a tube fitting. Nine password holes are designed in the top of the end cover, the password holes and specific codons are used in a combined mode to correspond to different types of wet electronic chemicals, the fool-proof effect is achieved, and heavy economic losses caused by personnel negligence or nonstandard liquid pumping operation can be effectively prevented. The dip tube and the barrel opening are designed in a double-sealing-ring matching mode, and compared with a traditional single-sealing-ring structure, a better sealing effect can be provided. The inner wall of the central through hole of the end cover of the dip tube and the inclined surface of the conical flaring of the tube are continuously extruded and in interference fit under the action of threaded connection, so that better connection tightness is achieved compared with ultrasonic welding, the end cover of the dip tube and the tube are not prone to falling off, and the risk of liquid leakage in the liquid extraction process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment and its auxiliary equipment, in particular to an extraction device for highly corrosive and highly oxidizing wet electronic chemicals, and specifically to a fool-proof and leak-proof dipping tube. Background Art

[0002] Wet electronic chemicals are raw materials used in large quantities in the production and assembly of electronic components and chips such as integrated circuits, optoelectronic devices, liquid crystal display devices, and computers in the semiconductor industry. They have the characteristics of high purity and high cleanliness. At present, wet electronic chemical packaging containers are mainly plastic barrels, tank trucks, etc. for road transportation. As a key accessory of wet electronic chemical packaging containers, the dip tube plays a very important role in the transportation and extraction process.

[0003] The wet electronic chemicals in the wet electronic chemical packaging container are extracted from the barrel through the cooperation of the extraction gun head and the dip tube. In order to prevent the chemical solution extracted from the production line from being inconsistent with the chemical solution required by the production line due to negligence of personnel, and to prevent the wet electronic chemicals with high cleanliness requirements from cross-contamination during the extraction process due to the use of different wet electronic chemical extraction gun heads, it is necessary to design a fool-proof function on the top of the dip tube end cap and use it with the extraction gun head to effectively avoid the wet electronic chemicals in the wrong barrel from being extracted, which will cause huge losses to the chip production. Due to the different production processes of the end cap and the pipe fittings of the dip tube, they cannot be formed in one piece and can only be connected through welding, assembly and other processes. The commonly used welding method is ultrasonic welding, which can meet the strength requirements in ordinary working scenarios. Since the welding part of the dip tube is immersed in the wet electronic chemicals with strong corrosiveness and strong oxidizing properties for a long time, the welding position is easy to fall off, resulting in the inability to extract liquid. At the same time, the dissolved particles will also cause pollution to the chemicals in the wet electronic chemical packaging container. After the wet electronic chemicals are filled in the wet electronic chemical packaging container, it is necessary to dump and roll it to test its sealing. For the dip tube with unreasonable matching structure design between the end cap of the dip tube and the barrel mouth of the wet electronic chemical packaging container, leakage will occur.

[0004] With the rapid development of the domestic semiconductor industry, the types of wet electronic chemicals are increasing. At the same time, as a key accessory of the wet electronic chemical packaging container, the dip tube is designed to ensure that there is no leakage during transportation and extraction to reduce unnecessary economic losses. Therefore, it is very important to design a dip tube with a fool-proof function, good sealing between the dip tube and the barrel of the wet electronic chemical packaging container, and a fastened connection between the dip tube end cap and the pipe fitting. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems that the existing dip tubes for chemical extraction are prone to inconsistency between the extracted chemical solution and the chemical solution required for the production line due to human negligence, and the technical problem that wet electronic chemicals with high cleanliness requirements are prone to cross contamination during the extraction process due to the use of different wet electronic chemical extraction gun heads. At the same time, in order to enhance the corrosion resistance and oxidation resistance of the dip tubes used for wet electronic chemical extraction, a dip tube with better sealing performance and less leakage during use is proposed.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A foolproof and leakproof liquid-dipping tube comprises a tube, an end cap, and an inner plug. The tube is composed of an extension tube and a connector from bottom to top. The lower end of the extension tube is used to draw liquid. The upper end of the extension tube is the connector. A slot is provided on the upper end of the connector. The inner wall of the slot is provided with a first internal thread.

[0008] The end cover is composed of a plug and a first connecting part from top to bottom. An O-ring is provided on the periphery of the plug. The upper end of the plug is open, and a receiving cavity for receiving an inner plug is provided inside the plug. A first external thread is provided on the outer side of the first connecting part. The first connecting part is threadedly connected to the first internal thread in the slot of the pipe fitting through the first external thread from the opening of the slot to the inside of the slot under rotational movement.

[0009] The inner plug is composed of an inner plug head and a second connecting part from top to bottom, and the outer periphery of the second connecting part is provided with a second external thread; the inner wall of the accommodating cavity is provided with a second internal thread, and the inner plug is connected to the second internal thread of the accommodating cavity through the second external thread. When in use, the inner plug head is inserted into the accommodating cavity through the upper end opening of the plug head, and the inner plug head is threadedly connected to the accommodating cavity by rotating the inner plug head. A countersunk hole is formed at the upper end of the inner plug head and extends downward. The countersunk hole cooperates with an external tool such as a screwdriver to enable the inner plug to be screwed into or out of the end cover. Preferably, the countersunk hole is a triangular countersunk hole.

[0010] A through hole is opened along the radial direction of the second connecting part and on the wall of the second connecting part. After the inner plug is placed in the accommodating cavity, the through hole is located below the inner plug and on the wall of the second connecting part, and is located in the middle position between the lower end of the plug head and the first external thread. With this structure, the pressure difference inside and outside the barrel can be balanced during the liquid extraction process to avoid deformation of the barrel.

[0011] The lower section of the first connecting part of the end cover extends downward to form a cylindrical structure, and the first external thread is arranged on the outside of the cylindrical structure. The lower end of the cylindrical structure is open. After the inner plug is placed in the accommodating cavity, the inner plug closes the upper end of the cylindrical structure, and a cavity can be formed by extending from the lower end opening of the cylindrical structure to the inside of the cylindrical structure. After the first connecting part is connected to the connecting head of the pipe fitting through the first external thread, the inner tube body of the extension tube is in tight contact with the inner wall of the cylindrical structure at the extended end at the upper end; the end cover is connected to the liquid extraction port of the barrel through the external thread, and a large O-ring and a medium O-ring are arranged on the external thread from top to bottom. With this structure, on the one hand, the end cover can be well connected to the pipe fitting through the threaded connection to achieve the first sealing of the part, and on the other hand, the second sealing of the part can be achieved through the tight contact between the extended end and the inner wall of the cylindrical structure.

[0012] After the pipe fitting is threadedly connected to the end cap, the inner tube body of the extension tube is at a horizontal position at the end of the upper extension end, which is located between the horizontal position of the uppermost end of the first external thread and the horizontal position of the lowermost end. This can better achieve the second sealing of this part.

[0013] The longitudinal section of the inner tube body of the extension tube at the extended end at the upper end is a conical expansion shape, and the conical expansion tends to expand to both sides. The interference connection is gradually squeezed through the inner wall of the cylindrical structure at the bottom of the end cover, which can effectively avoid the risk of leakage caused by gaps at the connection between the pipe fitting and the end cover.

[0014] The pipe fitting and the end cover are an integrally formed structure, the outer diameter of the extension pipe in the pipe fitting is smaller than the outer diameter of the connecting head; the outer diameter of the first connecting part in the end cover is smaller than the outer diameter of the plug head; the outer diameter of the second connecting part in the inner plug is smaller than the outer diameter of the inner plug head; the outer diameter of the connecting head of the pipe fitting is smaller than the outer diameter of the plug head of the end cover, so that the pipe fitting and the end cover can cleverly form a whole after being connected, and can be easily connected to the barrel cover of the barrel filled with liquid, so as to facilitate the absorption of the liquid in the barrel, and the structure is conducive to processing.

[0015] The upper end surface of the end cap is a plane, and a plurality of codon slots are formed on the plane by being recessed away from the plane. The cross-section of the codon slot includes a circle and a regular polygon. The codon slot is used to cooperate with the codon, and the codon is a columnar structure corresponding to the size of the codon slot; the upper end surface of the end cap is used to cooperate with one side of the chuck, and one side of the chuck is provided with a plurality of columns with cross-sectional shapes including a circle and a regular polygon. The chuck cooperates with the codon slot through the columnar body to realize the cooperation connection between the chuck and the end cap; the other side of the chuck is used to connect with the liquid extraction gun head;

[0016] A strip slot is formed on the upper end surface of the end cover and is recessed toward the inside of the plane away from the plane; the middle edge of the strip slot extends toward the center of the plane where the upper end surface of the end cover is located to form an extension slot, or the middle edge of the strip slot extends toward the outermost side of the plane where the upper end surface of the end cover is located to form an extension slot, and the extension slot is connected with the positioning pin, and correspondingly, a protrusion for positioning and centering the positioning pin is provided outwardly on the edge of the chuck; the third internal thread on the upper part of the cavity wall of the accommodating chamber is used for threaded connection with the gun tip of the liquid extraction gun tip.

[0017] When using this device, the following steps are taken:

[0018] Step 1) Connect the end cap to the pipe fitting, insert a tool into the countersunk hole and rotate it to unscrew the inner plug from the end cap, open the liquid extraction port at the lid of the chemical storage barrel, and extend the extension tube of the pipe fitting of the dip tube into the chemical storage barrel from the liquid extraction port;

[0019] Step 2) Connect the end cap, the chuck, and the liquid extraction gun head: insert the positioning pin into the extension slot, select different numbers and shapes of codons according to different chemicals, and place the selected codons into the codon slots at different positions / points;

[0020] According to the matching of the positioning pin and the protrusion, the column on the chuck and the remaining codon slots on the end cover can be quickly aligned, so that the chuck and the end cover can be quickly, efficiently and accurately matched and connected;

[0021] Step 3) Connect the other side of the chuck to the liquid extraction gun head, and extract the chemical liquid in the chemical storage barrel through the liquid extraction gun head;

[0022] Step 4) After the extraction is completed, follow the reverse steps of step 2) to separate the end cap, chuck, and extraction gun head, remove the dip tube from the chemical storage barrel, separate the end cap from the pipe, and reinsert the inner plug into the end cap.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] 1) The present invention uses a plurality of password holes designed on the top of the end cap in combination with the passwords to correspond to different types of wet electronic chemicals, which can effectively avoid chip production line production accidents and chemical pollution caused by negligence of personnel and misuse of the extraction gun head. The foolproof function has the characteristics of simple structure, safety and reliability, and fast docking, which can greatly reduce unnecessary economic losses;

[0025] 2) The present invention can ensure that chemicals will not leak from the barrel mouth during transportation through the cooperation of the double O-ring under the external thread of the end cover and the barrel mouth, thereby eliminating safety risks and reducing chemical pollution;

[0026] 3) In the present invention, the inner wall of the through hole at the bottom of the end cover of the suction tube and the conical inclined surface at the top of the pipe fitting are continuously squeezed into an interference fit under the action of the connection between the external thread at the bottom of the end cover and the internal thread at the top of the pipe fitting, which has better connection tightness than ultrasonic welding, making the end cover and the pipe fitting of the suction tube not easy to fall off, avoiding the risk of leakage during the liquid extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 and Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 3 for Figure 1 Schematic diagram of the structure of the middle pipe fitting;

[0030] Figure 4 for Figure 1 Schematic diagram of the structure after the middle end cover and the inner plug are connected;

[0031] Figure 5 for Figure 1 Cross-section of the middle plug;

[0032] Figure 6 for Figure 1 Schematic diagram of the structure of the middle plug;

[0033] Figure 7 A schematic diagram of the structure of a chuck in an embodiment of the present invention;

[0034] Figure 8 , Fig. 9 Schematic diagram of the connection between the liquid extraction gun head, the chuck, and the suction tube in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] like Figure 1 , Figure 2 As shown, a foolproof and leakproof liquid-dipping tube comprises a tube 8, an end cap 4, and an inner plug 2. The tube 8 is composed of an extension tube 6 and a connector 7 from bottom to top. The lower end of the extension tube 6 is used to draw liquid, and the upper end of the extension tube 6 is the connector 7. The upper end of the connector 7 is provided with a slot 18, and the inner wall of the slot 18 is provided with a first internal thread 26.

[0036] The end cover 4 is composed of a plug and a first connecting part 20 from top to bottom. An O-ring 16 is provided on the periphery of the plug 29. The upper end of the plug 29 is open, and a receiving cavity for receiving the inner plug 2 is provided inside the plug. A first external thread 19 is provided on the outer side of the first connecting part 20. The first connecting part 20 is threadedly connected to the first internal thread 26 in the slot of the pipe fitting 8 through the first external thread 19 under rotational movement from the opening of the slot to the inside of the slot.

[0037] like Figures 3 to 6 As shown, the inner plug 2 is composed of an inner plug head 28 and a second connecting portion 23 from top to bottom, and a second external thread 24 is provided on the periphery of the second connecting portion 23; the inner wall of the accommodating cavity is provided with a second internal thread 22, and the inner plug 2 is connected with the second internal thread 22 of the accommodating cavity through the second external thread 24. When in use, the inner plug head 28 is inserted into the accommodating cavity through the upper end opening of the plug head 29, and the inner plug head 28 is threadedly connected to the accommodating cavity by rotating the inner plug head 28. A countersunk hole 14 is formed at the upper end of the inner plug head 28 and extends downward. The countersunk hole 14 cooperates with an external tool such as a screwdriver to realize the inner plug 2 being screwed into the end cover 4 or screwed out of the end cover 4. Preferably, the countersunk hole is a triangular countersunk hole.

[0038] A through hole 21 is opened along the radial direction of the second connecting part 23 and on the wall of the second connecting part 23. After the inner plug 2 is placed in the accommodating cavity, the through hole 21 is located below the inner plug 2 and on the wall of the second connecting part 23, and is located in the middle position between the lower end of the plug head 29 and the first external thread 19. With this structure, the pressure difference inside and outside the wet electronic chemical packaging container can be balanced during the liquid extraction process to avoid barrel deformation.

[0039] The lower section of the first connecting portion 20 of the end cover 4 extends downward to form a cylindrical structure, and the first external thread 19 is arranged on the outside of the cylindrical structure. The lower end of the cylindrical structure is open. After the inner plug 2 is placed in the accommodating cavity, the inner plug 2 closes the upper end of the cylindrical structure, and a cavity 25 can be formed by extending from the lower end opening of the cylindrical structure to the inside of the cylindrical structure. After the first connecting portion 20 is connected to the connecting head 7 of the pipe fitting 8 through the first external thread 19, the inner tube body of the extension tube 6 is in close contact with the inner wall of the cylindrical structure at the extended end 27 at the upper end; the end cover 4 is connected to the liquid extraction port of the barrel through the external thread, and a large O-ring and a medium O-ring are arranged on the external thread from top to bottom. With this structure, on the one hand, the end cover 4 can be well connected to the pipe fitting 8 through the threaded connection to achieve the first sealing of this part, and on the other hand, the second sealing of this part can be achieved through the close contact of the extended end 27 with the inner wall of the cylindrical structure.

[0040] After the pipe fitting 8 is threadedly connected to the end cap 4, the inner tube body of the extension tube 6 is at a horizontal position at the end of the upper extension end 27, which is located between the horizontal position where the uppermost end of the first external thread 19 is located and the horizontal position where the lowermost end is located. This can better achieve the second sealing of this part.

[0041] The longitudinal section of the inner tube body of the extension tube 6 at the upper extension end 27 is a conical expansion shape, and the conical expansion tends to expand to both sides. The interference connection is gradually squeezed by the inner wall of the cylindrical structure at the bottom of the end cover, which can effectively avoid the risk of leakage caused by the gap at the connection between the pipe fitting 8 and the end cover 4.

[0042] The pipe fitting 8 and the end cover 4 are an integrally formed structure, the outer diameter of the extension tube 6 in the pipe fitting 8 is smaller than the outer diameter of the connecting head 7; the outer diameter of the first connecting portion 20 in the end cover 4 is smaller than the outer diameter of the plug 29; the outer diameter of the second connecting portion 23 in the inner plug 2 is smaller than the outer diameter of the inner plug 28; the outer diameter of the connecting head 7 of the pipe fitting 8 is smaller than the outer diameter of the plug 29 of the end cover 4, so that the pipe fitting 8 and the end cover 4 can cleverly form a whole after connection, and can be very easily connected to the barrel cover of the barrel filled with liquid, thereby facilitating the absorption of the liquid in the barrel, and the structure is conducive to processing.

[0043] like Figures 7 to 9 As shown, the upper end surface of the end cap 4 is a plane, and a plurality of codon slots 3 are formed on the plane by being recessed away from the plane. The cross-section of the codon slot 3 includes a circle and a regular polygon. The codon slot 3 is used to cooperate with the codon 1, and the codon 1 is a columnar structure corresponding to the size of the codon slot 3; the upper end surface of the end cap 4 is used to cooperate with one side of the chuck 31, and one side of the chuck 31 is provided with a plurality of columns 30 with cross-sectional shapes including a circle and a regular polygon. The chuck 31 cooperates with the codon slot 3 through the columnar body 30 to realize the cooperation connection between the chuck 31 and the end cap 4; the other side of the chuck 31 is used to be connected with the liquid extraction gun head;

[0044] A strip slot is formed on the upper end surface of the end cover 4 and is recessed toward the inside of the plane away from the plane; the middle edge of the strip slot extends toward the center of the plane where the upper end surface of the end cover 4 is located to form an extension slot, or the middle edge of the strip slot extends toward the outermost side of the plane where the upper end surface of the end cover 4 is located to form an extension slot, and the extension slot is connected with the positioning pin 5, and correspondingly, a protrusion 32 for positioning and centering the positioning pin 5 is provided outwardly on the edge of the chuck; the third internal thread 17 on the upper part of the wall of the accommodating chamber is used for threaded connection with the gun head of the liquid extraction gun head.

[0045] When using this device, the following steps are taken:

[0046] Step 1: Connect the end cap 4 to the pipe fitting 8, then insert a tool into the countersunk hole 14 and rotate it to unscrew the inner plug 2 from the end cap 4, open the liquid extraction port at the lid of the chemical storage barrel, and extend the extension tube 6 of the pipe fitting 8 of the dip tube into the chemical storage barrel from the liquid extraction port;

[0047] Step 2: Connect the end cap 4, the chuck 31, and the liquid extraction gun head: insert the positioning pin 5 into the extension groove, select different numbers and shapes of codons 1 according to different chemicals (for example, different numbers and shapes of codons 1 need to be selected for sulfuric acid extraction or phosphoric acid extraction, and the selected codons 1 are inserted into the codon slots 3 at different positions / points, so that there will be no mistakes when extracting liquid), and insert the selected codons 1 into the codon slots 3 at different positions / points;

[0048] According to the pairing of the positioning pin 5 and the protrusion 32, the columnar body 30 on the chuck 31 and the remaining codon slots on the end cover 4 can be quickly aligned, so that the chuck 31 and the end cover 4 are quickly, efficiently and accurately matched and connected;

[0049] Step 3: Connect the other side of the chuck 31 to the liquid extraction gun head, and extract the chemical liquid in the chemical storage barrel through the liquid extraction gun head;

[0050] Step 4: After the extraction is completed, separate the end cover 4, the chuck 31, and the liquid extraction gun head according to the reverse steps of step 2, and take out the suction tube from the chemical storage barrel; separate the end cover 4 from the chemical storage barrel, and separate the end cover 4 from the pipe fitting 8, and reinsert the inner plug 2 into the end cover 4.

[0051] In step 1, when connecting the end cap 4 to the pipe fitting 8, the connecting head of the pipe fitting 8 and the first connecting portion 20 of the end cap 4 are screwed together by threads, so that the conical expansion of the extension end 27 is gradually squeezed by the inner wall of the cylindrical structure at the bottom of the end cap during the screwing process to form an interference fit; this not only facilitates the manufacturing and processing of the end cap 4 and the pipe fitting 8, but also effectively avoids the risk of leakage caused by a gap at the connection between the pipe fitting 8 and the end cap 4;

[0052] In step 1, the chemical liquid storage barrel can be selected as a plastic barrel with a threaded liquid extraction port, and the threaded liquid extraction port is used to cooperate with the external thread 15 on the plug of the end cover 4. After the threaded connection, under the cooperation of the large O-ring and the medium O-ring, the suction tube and the chemical liquid storage barrel can have good sealing at the connection.

[0053] Example:

[0054] A foolproof and leakproof dipping tube comprises an end cap 4, an inner plug 2, a small O-type sealing ring, a positioning pin 5, a codon 1, a large and medium O-type sealing ring and a pipe fitting 8.

[0055] The end cap 4 comprises an end cap composed of 3 regular hexagonal password holes, 6 circular password holes, 4 rectangular grooves, 1 U-shaped groove, 1 positioning groove, 2 internal threads, 2 external threads, 2 O-ring grooves, 2 elliptical holes and a central through hole structure; an inner plug composed of an external thread and a triangular countersunk hole structure; a small O-ring; a positioning pin; a password; a large-medium O-ring; and a pipe fitting composed of an internal thread, a conical flared slope and a cylindrical tube, a total of seven parts.

[0056] Further, the end cap 4 comprises a regular hexagonal password hole, a circular password hole, a rectangular groove 11, a U-shaped groove 12, a positioning groove, an internal thread, an external thread, an O-ring groove 16, an elliptical hole and a central through hole structure; the regular hexagonal password hole, the circular password hole and the rectangular groove are evenly distributed on the top of the end cap 4 and cooperate with the password 1 to realize the foolproof function;

[0057] The positioning groove is centrally placed in the U-shaped groove; the internal threads (17, 22) are coaxially distributed on the end cover 4 and are respectively connected to the external threads of the liquid extraction gun head and the inner plug; the external threads (15, 19) are located at the upper and lower positions of the end cover 4 and are respectively connected to the internal threads of the barrel mouth and the internal threads 26 on the top of the pipe fitting; the O-ring groove 16 is located below the upper external thread and cooperates with the large and medium O-rings; the elliptical hole is located at the bottom of the end cover 4, which can balance the pressure difference between the inside and outside of the barrel to avoid deformation of the barrel during the liquid extraction process; the central through hole is located at the bottom of the end cover 4, and its inner surface is in contact with the conical expansion slope at the top of the pipe fitting.

[0058] Furthermore, the inner plug 2 comprises an external thread and a triangular countersunk hole structure; the external thread is located at the bottom of the inner plug 2 and is connected to the internal thread of the end cover; the triangular countersunk hole is located at the center of the top of the inner plug 2 and cooperates with the barrel opener to complete the unscrewing of the inner plug 2. The triangular structure can effectively prevent slipping failure caused by long-term screwing.

[0059] Furthermore, the small O-ring has a circular cross section and is in an annular shape as a whole, and contacts the lower surface of the boss of the inner plug 2 to prevent leakage of wet electronic chemicals.

[0060] Furthermore, the positioning pin 5 has a circle of bosses that are interference fit with the positioning groove 13 on the end cover 4 to prevent it from falling off, and the liquid extraction gun head can quickly confirm the position of the gun head code disk through the positioning pin 5.

[0061] Furthermore, the codon 1 includes two structures, a conical shape and a hexagonal cylinder, and is connected with the regular hexagonal codon hole 9 and the circular codon hole 10 on the end cap 4 by interference fit. The numbers of the three codons inserted in different combinations correspond to a chemical, thereby achieving a foolproof effect.

[0062] Furthermore, the large-medium O-ring has a circular cross section and is annular in shape as a whole, and cooperates with the O-ring groove 16 on the end cover 4 to form a double seal, and has better sealing performance than a single seal.

[0063] Furthermore, the pipe fitting 8 comprises an internal thread 26, a tapered flared bevel and a cylindrical tube; the internal thread 26 is located at the top of the pipe fitting 8 and is connected to the external thread 24 at the bottom of the end cover. During the continuous screwing process, the tapered flared bevel at the top of the pipe fitting and the inner surface 27 of the through hole at the bottom of the end cover gradually squeeze the interference connection, which can effectively avoid the risk of leakage caused by a gap at the connection between the pipe fitting 8 and the end cover 4; the cylindrical tube extends to the bottom of the barrel to realize the filling and extraction of wet electronic chemicals in the barrel.

Claims

1. A foolproof and leakproof dip tube, characterized in that: The invention comprises a pipe fitting (8), an end cover (4), and an inner plug (2), wherein the pipe fitting (8) is composed of an extension pipe (6) and a connector (7) from bottom to top, wherein the lower end of the extension pipe (6) is used for drawing liquid, the upper end of the extension pipe (6) is the connector (7), the upper end of the connector (7) is provided with a slot (18), and the inner wall of the slot (18) is provided with a first internal thread (26); The end cover (4) is composed of a plug head and a first connecting portion (20) from top to bottom. An O-ring (16) is arranged on the outer periphery of the plug head (29). The upper end of the plug head (29) is open, and a receiving cavity for receiving the inner plug (2) is arranged inside the plug head. A first external thread (19) is arranged on the outer side of the first connecting portion (20). The first connecting portion (20) is threadedly connected to a first internal thread (26) in the slot of the pipe fitting (8) through the first external thread (19) from the opening of the slot to the inside of the slot under rotational movement.

2. The foolproof and leakproof dip tube according to claim 1, characterized in that: The inner plug (2) is composed of an inner plug head (28) and a second connecting portion (23) from top to bottom, and a second external thread (24) is provided on the periphery of the second connecting portion (23); the inner wall of the accommodating cavity is provided with a second internal thread (22), and the inner plug (2) is connected to the second internal thread (22) of the accommodating cavity through the second external thread (24). When in use, the inner plug head (28) is inserted into the accommodating cavity through the upper end opening of the plug head (29), and the inner plug head (28) is threadedly connected to the accommodating cavity by rotating the inner plug head (28). A countersunk hole (14) is formed at the upper end of the inner plug head (28) and extends downward. The countersunk hole (14) cooperates with an external tool such as a screwdriver to enable the inner plug (2) to be screwed into the end cover (4) or screwed out of the end cover (4).

3. The foolproof and leakproof dip tube according to claim 2, characterized in that: A through hole (21) is opened along the radial direction of the second connecting portion (23) and on the wall of the second connecting portion (23); after the inner plug (2) is placed in the accommodating cavity, the through hole (21) is located below the inner plug (2) and on the wall of the second connecting portion (23), and is located at a middle position between the lower end of the plug head (29) and the upper side of the first external thread (19).

4. The foolproof and leakproof dip tube according to any one of claims 1 to 3, characterized in that: The lower section of the first connecting portion (20) of the end cover (4) extends downward to form a cylindrical structure, the first external thread (19) is arranged on the outside of the cylindrical structure, the lower end of the cylindrical structure is open, after the inner plug (2) is placed in the accommodating cavity, the inner plug (2) closes the upper end of the cylindrical structure, and a cavity (25) is formed by extending from the lower end opening of the cylindrical structure to the inside of the cylindrical structure, after the first connecting portion (20) is connected to the connector (7) of the pipe fitting (8) through the first external thread (19), the inner tube body of the extension tube (6) is in tight contact with the inner wall of the cylindrical structure at the upper extension end (27); the end cover (4) is connected to the liquid extraction port of the barrel through the external thread, and a large O-ring and a medium O-ring are arranged on the external thread from top to bottom.

5. The foolproof and leakproof dip tube according to claim 4, characterized in that: After the pipe fitting (8) is threadedly connected to the end cover (4), the inner tube body of the extension tube (6) is at a horizontal position at the end of the upper extension end (27), which is located between the horizontal position where the uppermost end of the first external thread (19) is located and the horizontal position where the lowermost end is located.

6. The foolproof and leakproof dip tube according to claim 4, characterized in that: The longitudinal section of the inner tube body of the extension tube (6) at the upper extension end (27) is conically expanded, and the conical expansion tends to expand to both sides. The interference fit connection is gradually squeezed by the inner wall of the cylindrical structure at the bottom of the end cover, which can effectively avoid the risk of leakage caused by a gap at the connection between the pipe fitting (8) and the end cover (4).

7. The foolproof and leakproof dip tube according to any one of claims 2 to 6, characterized in that: The pipe fitting (8) and the end cover (4) are an integrally formed structure. The outer diameter of the extension pipe (6) in the pipe fitting (8) is smaller than the outer diameter of the connecting head (7); the outer diameter of the first connecting portion (20) in the end cover (4) is smaller than the outer diameter of the plug head (29); the outer diameter of the second connecting portion (23) in the inner plug (2) is smaller than the outer diameter of the inner plug head (28); and the outer diameter of the connecting head (7) of the pipe fitting (8) is smaller than the outer diameter of the plug head (29) of the end cover (4). In this way, the pipe fitting (8) and the end cover (4) can cleverly form an integral body after being connected, and can be easily connected to the barrel cover of a barrel containing liquid, thereby facilitating the absorption of liquid in the barrel. At the same time, the structure is convenient for processing.

8. The foolproof and leakproof dip tube according to claim 1, characterized in that: The upper end surface of the end cap (4) is a plane, and a plurality of codon slots (3) are formed on the plane by being recessed away from the plane. The cross-section of the codon slots (3) includes a circle and a regular polygon. The codon slots (3) are used to be matched and connected with the codon (1). The codon (1) is a columnar structure corresponding to the size of the codon slot (3). The upper end surface of the end cap (4) is used to be matched and connected with one side of a chuck (31). One side of the chuck (31) is provided with a plurality of columnar bodies (30) with cross-sectional shapes including a circle and a regular polygon. The chuck (31) is matched with the codon slots (3) through the columnar bodies (30) to achieve the matched connection between the chuck (31) and the end cap (4). The other side of the chuck (31) is used to be connected with a liquid extraction gun head.

9. The foolproof and leakproof dip tube according to claim 8, characterized in that: A strip slot is formed on the upper end surface of the end cover (4) and is recessed toward the inside of the plane away from the plane; the middle edge of the strip slot extends toward the center of the plane where the upper end surface of the end cover (4) is located to form an extension slot, or the middle edge of the strip slot extends toward the outermost side of the plane where the upper end surface of the end cover (4) is located to form an extension slot, the extension slot is matched and connected with the positioning pin (5), and correspondingly, a protrusion (32) for positioning and centering the positioning pin (5) is provided outwardly on the edge of the chuck; the third internal thread (17) on the upper part of the wall of the accommodating chamber is used for threaded connection with the gun head of the liquid extraction gun head.

10. The foolproof and leakproof dip tube according to claim 8 or 9, characterized in that: When using this device, the following steps are taken: Step 1) Connect the end cover (4) to the pipe fitting (8), insert a tool into the countersunk hole (14) and rotate it to screw the inner plug (2) out of the end cover (4), open the liquid extraction port at the lid of the chemical storage barrel, and extend the extension tube (6) of the pipe fitting (8) of the dip tube into the chemical storage barrel through the liquid extraction port; Step 2) The end cap (4), the chuck (31), and the liquid extraction gun head are matched and connected: the positioning pin (5) is placed in the extension groove, and different numbers and shapes of codons (1) are selected according to different chemicals (for example, different numbers and shapes of codons (1) need to be selected for sulfuric acid extraction or phosphoric acid extraction, and the positions / points of the selected codons (1) to be inserted into the codon slots (3) are also different, so that no mistakes will be made during liquid extraction), and the selected codons (1) are placed in the codon slots (3) at different positions / points; According to the pairing of the positioning pin (5) and the protrusion (32), the columnar body (30) on the chuck (31) and the remaining codon slots on the end cover (4) can be quickly aligned, so that the chuck (31) and the end cover (4) are quickly, efficiently and accurately matched and connected; Step 3) Connect the other side of the chuck (31) to a liquid extraction gun head, and extract the chemical liquid in the chemical storage barrel through the liquid extraction gun head; Step 4) After the extraction is completed, the end cover (4), the chuck (31) and the liquid extraction gun head are separated according to the reverse steps of step 2), the dip tube is taken out of the chemical storage barrel, the end cover (4) is separated from the pipe fitting (8), and the inner plug (2) is reinserted into the end cover (4).

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