PFA gun head with good corrosion resistance

Abstract

The PFA gun head comprises a connector, a gun head assembly is arranged on the connector, the gun head assembly comprises a body fixedly connected with the connector, a conical opening is formed in the lower end of the body, a baffle ring is arranged in the conical opening, a rubber ring is placed on the baffle ring, a pressing plate is fixedly connected to the rubber ring, and the pressing plate is fixedly connected with the connector. A plurality of limiting sleeves are fixedly connected to the inner wall of the main body, pressing rods are inserted into the limiting sleeves, and the lower ends of the pressing rods abut against the pressing plate. According to the utility model, the gun head assembly is arranged, and the pressing plate is matched with the rubber ring, so that when the gun head is used, the driving shell is rotated to drive the pressing plate to press the rubber ring, so that the rubber ring is deformed, the inner diameter of the rubber ring is further changed, and the aim of adjusting the liquid inlet caliber of the gun head is fulfilled; finally, a user can easily control the speed of sucking and outputting liquid when the gun head is used, and the user can conveniently carry out fine operation.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory equipment and devices, in particular to a PFA gun head with good corrosion resistance. Background Art

[0002] PFA gun tip, also known as PFA pipette tip, is a high-performance pipette accessory made of perfluoropropylene (Perfluoropropylene) material. PFA is also called soluble polytetrafluoroethylene and Teflon. It can be used for trace analysis, isotope detection, I CP-MS / OES / AAS analysis and other experiments. PFA pipette tip, also called pipette gun tip, nozzle. This material has excellent chemical resistance, heat resistance and electrical insulation properties, which makes PFA pipette tip perform well in application. PFA pipette tip has excellent chemical corrosion resistance. Whether it is acidic solution, alkaline solution or organic solvent, PFA pipette tip can resist corrosion well and ensure long-term stable use. This makes PFA pipette tip the first choice when dealing with highly corrosive chemicals.

[0003] In the prior art, the specifications of PFA gun tips are fixed, and the suction speed is only affected by the opening size of the gun tip and the viscosity of the liquid. However, there are many types of liquids in the laboratory, and it is difficult to control the suction and output speeds, which ultimately leads to inconvenience in user operation and affects the experimental progress. Therefore, we propose a PFA gun tip with good corrosion resistance to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and provides a PFA gun head with good corrosion resistance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A PFA gun head with good corrosion resistance, comprising a connecting head, wherein a gun head assembly is arranged on the connecting head;

[0007] The gun head assembly includes a main body fixedly connected to the connecting head, a tapered mouth is provided at the lower end of the main body, a retaining ring is provided in the tapered mouth, a rubber ring is placed on the retaining ring, a pressure plate is fixedly connected to the rubber ring, a plurality of limit sleeves are fixedly connected to the inner wall of the main body, a pressure rod is inserted in the limit sleeve, the lower end of the pressure rod is abutted against the pressure plate, the upper end of the main body is slidably connected to a drive shell, an internal thread is provided in the drive shell, a sliding sleeve is connected to the internal thread of the drive shell, and the lower end of the sliding sleeve is abutted against the pressure rod, and a strip groove is provided on the side wall of the main body close to the drive shell.

[0008] Preferably, the sliding sleeve includes a threaded shell, a connecting nozzle is provided at the upper end of the threaded shell, and a conical tube is connected to the lower end of the threaded shell, a pressure ring is fixedly connected to the lower end of the conical tube, an annular groove is provided on the lower surface of the pressure ring, and a sealing ring is fixedly connected to the side wall of the pressure ring.

[0009] Preferably, the retaining ring is arranged close to the lower end opening of the tapered mouth, and the outer diameter of the rubber ring is smaller than the inner diameter of the lower end of the tapered mouth.

[0010] Preferably, the side wall of the driving housing is provided with a plurality of anti-skid grooves, and the anti-skid grooves are arranged close to the strip grooves.

[0011] Preferably, a limit card is placed at the lower end of the connector, and a ball is arranged in the limit card, and the ball is arranged to abut against the drive housing.

[0012] Preferably, the pressure ring is made of a rigid material, and the sealing ring is disposed against the inner wall of the main body.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides a gun head assembly and adopts a pressure plate to match the rubber ring. When the gun head is used, the driving shell belt and the pressure plate can be rotated to press the rubber ring to deform the rubber ring, thereby changing the inner diameter of the rubber ring, thereby achieving the purpose of adjusting the liquid inlet diameter of the gun head. Finally, the user can easily control the speed of the gun head to suck in and output liquid when in use, which is convenient for the user to perform more delicate operations.

[0015] 2. The utility model provides a sliding sleeve to cooperate with the connecting nozzle and other components to ensure that the gun head can be adjusted externally while having good sealing performance. On the other hand, after use, the parts inside the main body can be taken out for comprehensive cleaning to ensure the reusability of the gun head and avoid contamination of other liquids during subsequent use due to difficulty in cleaning the inside of the gun head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a PFA gun head with good corrosion resistance proposed by the utility model;

[0017] Figure 2 This is a schematic cross-sectional structure diagram of the upper part of a PFA gun head with good corrosion resistance proposed by the utility model;

[0018] Figure 3 The utility model provides a cross-sectional structural schematic diagram of the lower half of a PFA gun head with good corrosion resistance.

[0019] In the figure: 1. Connector; 2. Main body; 3. Conical mouth; 4. Retaining ring; 5. Rubber ring; 6. Pressure plate; 7. Drive housing; 8. Internal thread; 9. Sliding sleeve; 91. Threaded housing; 92. Connecting nozzle; 93. Pressing ring; 10. Pressing rod; 11. Strip groove; 12. Anti-slip groove; 13. Limiting card. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-3 , a PFA gun tip with good corrosion resistance, comprising a connecting head 1, on which a gun tip assembly is arranged;

[0022] The gun head assembly includes a main body 2 fixedly connected to the connector 1. The specific shape of the main body 2 is shown in the schematic diagram. It is composed of multiple sections of FPA pipelines with different inner diameters. A tapered mouth 3 is provided at the lower end of the main body 2. A retaining ring 4 is provided in the tapered mouth 3, and a rubber ring 5 is placed on the retaining ring 4. A pressure plate 6 is fixedly connected to the rubber ring 5. A plurality of limit sleeves are fixedly connected to the inner wall of the main body 2, and a pressure rod 10 is inserted in the limit sleeve, and the lower end of the pressure rod 10 is abutted against the pressure plate 6. The upper end of the main body 2 is slidably connected to a drive shell 7, and an internal thread 8 is provided in the drive shell 7. The internal thread 8 of the drive shell 7 is connected to a sliding sleeve 9, and the lower end of the sliding sleeve 9 is abutted against the pressure rod 10. A strip groove 11 is provided on the side wall of the main body 2 close to the drive shell 7.

[0023] Furthermore, the sleeve 9 includes a threaded shell 91, the upper end of which is provided with a connecting nozzle 92, and the lower end of the threaded shell 91 is connected to a conical tube, the lower end of the conical tube is fixedly connected to a pressing ring 93, the lower surface of the pressing ring 93 is provided with an annular groove, and the side wall of the pressing ring 93 is fixedly connected to a sealing ring. In this design, the connecting nozzle 92 is used to connect with the pipette to ensure that the liquid passes through the sleeve 9 from the conical tube. It should be noted that the method of compressing the rubber ring 5 to deform and change its inner diameter has a very small moving stroke for the entire conical tube, and the connecting nozzle 92 will not be separated from the pipette. On the other hand, in most cases, the single pipetting amount often does not fill the entire gun head, so this type of gun head will not leak when in use.

[0024] Furthermore, the retaining ring 4 is arranged close to the lower end opening of the tapered mouth 3, and the outer diameter of the rubber ring 5 is smaller than the inner diameter of the lower end of the tapered mouth 3. After the rubber ring 5 is deformed under force, not only the inner diameter will decrease, but the outer diameter will also increase. Therefore, a certain gap needs to be left between the rubber ring 5 and the inner wall of the tapered mouth 3.

[0025] Furthermore, the side wall of the driving shell 7 is provided with a plurality of anti-skid grooves 12 , and the anti-skid grooves 12 are arranged close to the strip grooves 11 . The anti-skid grooves 12 are provided to facilitate the user to directly rotate the driving shell 7 by hand.

[0026] Furthermore, a limit card 13 is placed at the lower end of the connector 1, and a ball is arranged in the limit card 13. The ball is arranged to abut against the drive shell 7. Since the limit card 13 is needed to ensure that the position of the drive shell 7 does not move, there is a certain pressure between the limit card 13 and the drive shell 7, so the ball is arranged to reduce friction.

[0027] Furthermore, the pressure ring 93 is made of a rigid material, and the sealing ring is set against the inner wall of the main body 2. In this design, the pressure ring 93 is used to ensure that the pressure rod 10 can be pressed down stably, and the sealing ring is used to avoid the limit sleeve from being used to ensure the sealing between the pressure ring 93 and the inner wall of the main body 2.

[0028] When the user uses the present invention, the user can directly use the gun head assembly by connecting the connecting head 1 to the pipette gun. When performing the pipetting operation, according to the viscosity of the liquid and the actual needs, the user rotates the driving shell 7 and uses the internal thread 8 on the driving shell 7 to drive the sliding sleeve 9 to move up and down. When the sliding sleeve 9 moves downward, the pressure rod 10 can be driven to move downward, and then cooperate with the pressure plate 6 to press the rubber ring 5, so that the rubber ring 5 is deformed. At this time, after the rubber ring 5 is deformed, the inner diameter of the rubber ring 5 becomes smaller, so that the cross-section of the liquid flow becomes smaller, thereby achieving the purpose of adjusting the liquid flow rate within a certain range. For liquids with higher viscosity, the driving shell 7 can be rotated so that the pressure rod 10 no longer presses the rubber ring 5, thereby achieving the purpose of increasing the flow cross-section. On the other hand, in this design, the driving shell 7, the pressure rod 10, the pressure plate 6 and the rubber ring 5 and other components in the main body 2 can be disassembled after use, which is convenient for cleaning after use, ensuring that there is no dead corner in the gun head that is difficult to clean, and convenient for users to reuse the gun head, meeting the actual needs of users.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PFA gun tip with good corrosion resistance, characterized in that: It comprises a connecting head (1), on which a gun head assembly is arranged; The gun head assembly comprises a main body (2) fixedly connected to a connecting head (1), a conical mouth (3) being provided at the lower end of the main body (2), a retaining ring (4) being provided in the conical mouth (3), a rubber ring (5) being placed on the retaining ring (4), a pressure plate (6) being fixedly connected to the rubber ring (5), a plurality of limit sleeves being fixedly connected to the inner wall of the main body (2), a pressure rod (10) being inserted in the limit sleeve, the lower end of the pressure rod (10) being abutted against the pressure plate (6), the upper end of the main body (2) being slidably connected to a drive shell (7), an internal thread (8) being provided in the drive shell (7), a sliding sleeve (9) being connected to the internal thread (8) of the drive shell (7), the lower end of the sliding sleeve (9) being abutted against the pressure rod (10), and a strip groove (11) being provided on the side wall of the main body (2) close to the drive shell (7).

2. A PFA gun tip with good corrosion resistance according to claim 1, characterized in that: The sliding sleeve (9) comprises a threaded shell (91), the upper end of the threaded shell (91) is provided with a connecting nozzle (92), and the lower end of the threaded shell (91) is connected to a conical tube, the lower end of the conical tube is fixedly connected to a pressing ring (93), the lower surface of the pressing ring (93) is provided with an annular groove, and the side wall of the pressing ring (93) is fixedly connected to a sealing ring.

3. A PFA gun tip with good corrosion resistance according to claim 1, characterized in that: The retaining ring (4) is arranged close to the lower opening of the tapered mouth (3), and the outer diameter of the rubber ring (5) is smaller than the inner diameter of the lower end of the tapered mouth (3).

4. A PFA gun tip with good corrosion resistance according to claim 1, characterized in that: The side wall of the driving housing (7) is provided with a plurality of anti-skid grooves (12), and the anti-skid grooves (12) are arranged close to the strip grooves (11).

5. A PFA gun tip with good corrosion resistance according to claim 1, characterized in that: A limit card (13) is placed at the lower end of the connector (1), and a ball is arranged inside the limit card (13), and the ball is arranged to abut against the drive housing (7).

6. A PFA gun tip with good corrosion resistance according to claim 2, characterized in that: The pressure ring (93) is made of a rigid material, and the sealing ring is arranged to abut against the inner wall of the main body (2).

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