A syringe for a laboratory and a method of using the same

Abstract

A syringe for laboratory use and its method of use include a syringe body, a piston disposed within the syringe body, a push-pull rod disposed at one end of the piston, a front plate disposed at one end of the syringe body, and a rear plate disposed at the other end of the syringe body. A perforation is formed in the rear plate, through which one end of the push-pull rod passes. A short outlet tube and a feed inlet are disposed in the front plate. The short outlet tube is located on the vertical center line of the front plate, with its inner edge close to the inner edge of the syringe body. A plug is disposed in the feed inlet. A cleaning port is formed in the rear plate. The syringe is placed horizontally with the short outlet tube positioned above the front plate to expel excess air from the liquid within the syringe body, leaving a small amount of air inside. The syringe is then rotated 180° axially so that the short outlet tube is positioned below the front plate. The syringe is connected to an injection pump. The length of the liquid column within the syringe body is read from a length scale. This value and the injection time are input into the injection pump, and the injection begins.

Description

Technical Field

[0001] This invention relates to the field of injection equipment technology, and in particular to a syringe for laboratory use and its method of use. Background Technology

[0002] In chemical laboratory experiments, syringes are needed to add various reagent solutions to reaction flasks at regular intervals and in precise quantities. However, existing syringes have the following drawbacks: 1. The outlet of existing syringes is located in the center of the syringe barrel. When drawing liquid, excess air is inevitably drawn in. When the syringe capacity is small and can be pushed by hand, it is easy to expel excess air. However, when a large-capacity syringe cannot be pushed by hand and needs to be attached to a syringe pump, the syringe is placed horizontally, making it difficult to expel air from the outlet in the center of the syringe barrel. 2. Most existing syringes are suction-type, which makes it very difficult to draw in high-viscosity solutions. In experiments on the synthesis of coatings and adhesives, drawing in solutions containing large amounts of... When pre-emulsifying foam, the vacuum inside the syringe will significantly increase the volume of the pre-emulsified solution; third, existing syringes are generally small-capacity, while laboratories need larger-capacity syringes. Large-capacity syringes mean larger syringe diameters, larger sealing surfaces, and greater force to push the piston, requiring syringes with high-strength structures; fourth, existing syringes are usually designed for single-use medical use, making them inconvenient to clean and reuse, wasting resources and increasing experimental costs; fifth, existing syringes are not specifically designed for laboratories, and their sealing rings are particularly susceptible to solvent corrosion, quickly swelling and failing in solvents such as acetone, toluene, acrylates, and tetrahydrofuran. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a syringe for laboratory use and its method of use that has a large capacity, can be directly fed without suction, can be placed horizontally to expel excess air, can be washed and reused to reduce experimental costs, has high structural strength and a long service life.

[0004] The present invention provides a technical solution for a syringe used in a laboratory: comprising an injection barrel, a piston disposed within the injection barrel, a push-pull rod disposed at one end of the piston, a front plate disposed at one end of the injection barrel, and a rear plate disposed at the other end of the injection barrel, a perforation being formed in the rear plate, one end of the push-pull rod passing through the perforation, a liquid outlet tube and a feed inlet disposed in the front plate, the liquid outlet tube being located on the vertical center line of the front plate, the inner wall edge of the liquid outlet tube being close to the inner wall edge of the injection barrel, a plug disposed in the feed inlet, and a cleaning port disposed in the rear plate.

[0005] Furthermore, the edge of the feed inlet is close to the inner wall edge of the injection cylinder.

[0006] Furthermore, the feed inlet is provided with an internal thread, and the plug is provided with an external thread, and the plug and the feed inlet are threadedly engaged.

[0007] Furthermore, the edge of the cleaning port is close to the inner wall edge of the injection cylinder.

[0008] Furthermore, three or more connecting rods are provided on the outer wall of the injection cylinder between the front plate and the rear plate.

[0009] Furthermore, a length scale is provided on one of the connecting rods.

[0010] Furthermore, the front panel is provided with three or more support feet.

[0011] Furthermore, a sealing groove is formed on the outer ring of the piston, and a perfluoroether rubber sealing ring is placed in the sealing groove.

[0012] The technical solution of the present invention for a method of using a syringe in a laboratory includes the following steps: ① Insert the outlet tube connected to the hose into the liquid to be drawn. By pulling the push-pull rod, the push-pull rod drives the piston to move backward, so that the liquid is drawn into the syringe through the outlet tube. Alternatively, open the plug and add the liquid directly from the inlet, and then seal it with the plug. ② Place the syringe horizontally so that the dispensing tube is located at the top of the front plate. Connect the syringe to the injection pump. The injection pump drives the push-pull rod, which in turn moves the piston forward to expel excess air from the liquid inside the syringe. A small amount of air remains inside the syringe. At this point, the piston stops moving. ③ Separate the syringe from the injection pump, rotate the syringe axially 180° so that the liquid outlet tube is located at the bottom of the front plate, reconnect the syringe to the injection pump, and use a hose to connect the syringe to the reactor; ④ Read the length of the liquid column inside the syringe from the length scale, input the value and injection time into the syringe pump, and start the injection dripping.

[0013] The beneficial effects of the syringe for laboratory use and its method of use according to the present invention are: 1. A liquid outlet is provided on the inner wall edge of the front plate near the syringe body to facilitate the removal of excess air when filling reagents; 2. When expelling excess air, leave a small air bubble, invert the syringe and start dripping. When the dripping is complete, the air bubble will squeeze out all the liquid in the syringe and the connecting tubing between the syringe and the reaction flask, leaving no residue. 3. The feed inlet is designed to allow for the quick and convenient addition of highly viscous materials and materials that are not suitable for suction, such as pre-emulsions; Fourth, the syringe barrel piston can be easily cleaned daily through the cleaning port and feed port. The edges of the cleaning port and feed port are close to the inner wall edge of the syringe barrel, which facilitates the rapid and thorough discharge of cleaning fluid, especially cleaning fluid containing particulate residue. The assembly structure of the syringe barrel, front plate, rear plate and connecting rod can be quickly disassembled and the piston pulled out to thoroughly clean the inner wall of the barrel, piston and sealing ring, and then quickly reassembled. The syringe can be reused after cleaning, reducing experimental costs. 5. Compared with wet friction, dry friction between the sealing ring and the inner wall of the syringe barrel increases the resistance many times over. Water or a suitable solvent can be easily dripped into the cleaning port to wet the sealing ring, which greatly reduces the piston back resistance and ensures the smooth operation of the syringe pump. 6. A support foot is provided on the front side of the front panel so that the syringe can be placed vertically, which takes up less table space and facilitates the drainage of cleaning fluid in the syringe, allowing the inside of the syringe to dry quickly. 7. The syringe has high structural strength and can withstand the high push and pull force of the injection pump for high-pressure injection, thus enabling large-capacity injection. 8. The piston is equipped with a perfluoroether rubber seal, which can withstand the corrosion of most chemicals and has an extremely long service life. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the front side of a syringe for laboratory use according to the present invention; Figure 2 This is a rear perspective view of a syringe for laboratory use according to the present invention; Figure 3 This is a schematic diagram of the structure of a syringe for laboratory use according to the present invention, in which the dispensing tube is located on the upper part of the front plate; Figure 4 yes Figure 3 A magnified view of part A; Figure 5 yes Figure 3 A magnified view of part B; Figure 6 This is a schematic diagram of the structure of a syringe for laboratory use according to the present invention, in which the liquid outlet tube is located at the lower part of the front plate; Figure 7 This is a three-dimensional schematic diagram of a syringe and injection pump used in the laboratory according to the present invention.

[0015] In the diagram, 1. Injector body; 2. Piston; 3. Push-pull rod; 4. Front plate; 5. Rear plate; 6. Liquid outlet short pipe; 7. Inlet; 8. Plug; 9. Perforation; 10. Cleaning port; 11. Connecting rod; 14. Length scale; 15. Sealing groove; 16. Perfluoroether rubber sealing ring; 17. Support foot; 18. Liquid; 19. Small air bubble; 20. Injection pump; 21. Motor; 22. Nut; 23. Push-pull block; 24. Cover plate; 25. Insert; 26. Corrosion-resistant sealing gasket; 27. Ordinary elastic gasket. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0017] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "set," "equipped with," "installed," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0018] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0019] To further illustrate the content, features, and effects of this invention, the invention will be described in detail below with reference to the accompanying drawings and examples, but this should not be construed as limiting the invention.

[0020] This invention relates to a syringe for laboratory use, such as... Figure 1 — Figure 7 As shown, the device includes an injection cylinder 1, a piston 2 disposed within the injection cylinder 1, a push-pull rod 3 disposed at one end of the piston 2, a front plate 4 disposed at one end of the injection cylinder 1, and a rear plate 5 disposed at the other end of the injection cylinder 1. A perforation 9 is formed in the rear plate 5, and one end of the push-pull rod 3 passes through the perforation 9. A liquid outlet short tube 6 and a feed inlet 7 are disposed in the front plate 4. The liquid outlet short tube 6 is located on the vertical center line of the front plate 4, and the inner wall edge of the liquid outlet short tube 6 is close to the inner wall edge of the injection cylinder 1. A plug 8 is disposed in the feed inlet 7, and a cleaning port 10 is formed in the rear plate 5.

[0021] Furthermore, the edge of the feed inlet 7 is close to the inner wall edge of the injection cylinder 1. The liquid to be injected can be added directly through the feed inlet 7, or after the injection is completed, the cleaning solution can be added through the feed inlet 7 to clean the inner wall of the injection cylinder 1 in front of the piston 2. After cleaning, the feed inlet 7 is turned downwards so that the liquid in the injection cylinder 1 in front of the piston 2 can be discharged. The edge of the feed inlet 7 is close to the inner wall edge of the injection cylinder 1, making it easier for the liquid to be discharged completely, especially when the cleaning solution contains solid residue, it is less likely to remain.

[0022] Furthermore, the feed inlet 7 is provided with an internal thread, and the plug 8 is provided with an external thread, and the plug and the feed inlet 7 are threadedly engaged.

[0023] Furthermore, the edge of the cleaning port 10 is close to the inner wall edge of the syringe barrel 1. After the injection dripping is completed, the cleaning solution can be added through the cleaning port 10 to clean the inner wall of the syringe barrel 1 located behind the piston 2. After cleaning, the cleaning port 10 is turned downwards so that the liquid in the syringe barrel 1 located behind the piston 2 can be discharged. The closer the inner wall edge of the cleaning port 10 is to the inner wall edge of the syringe barrel 1, the cleaner the liquid will be discharged, especially when the cleaning solution contains particulate residue, it is less likely to remain.

[0024] Furthermore, three or more connecting rods 11 are provided on the outer wall of the injection cylinder 1 between the front plate 4 and the rear plate 5. These rods both compress the sealing gasket between the front plate 4 and the injection cylinder 1 to seal the syringe and prevent leakage under certain pressure, and also provide support for the glass injection cylinder 1 to prevent it from cracking due to excessive pressure.

[0025] Furthermore, a length scale 14 is provided on one of the connecting rods 11. The length of the liquid column inside the syringe 1 can be observed through the length scale 14.

[0026] Furthermore, the front plate 4 is provided with three or more support feet 17. The support feet 17 can be directly welded to the front side of the front plate 4, or they can be integrally connected with the connecting rod 11, that is, the front end of the connecting rod 11 extends through the front plate 4 to form the support feet 17, and its length must be longer than the length of the liquid outlet tube 6. After cleaning the inside of the syringe body 1, the syringe body 1 can be placed vertically with one end of the support feet 17 facing down to allow the cleaning liquid to drain fully and dry quickly.

[0027] Furthermore, a sealing groove 15 is formed on the outer ring of the piston 2, and a perfluoroether rubber sealing ring 16 is installed in the sealing groove 15. The perfluoroether rubber sealing ring 16 can withstand the corrosion of most chemicals and has an extremely long service life.

[0028] The present invention also relates to a method of using a syringe for laboratory use, comprising the following steps: ① Insert the outlet tube 6 into the tubing to be sucked up. Pull the push rod 3, which will cause the piston 2 to move backward, so that the liquid is sucked into the syringe body 1 through the outlet tube 6. Alternatively, open the plug 8 and add the liquid directly from the feed port 7, and then seal it with the plug 8. ② Place the syringe horizontally so that the liquid outlet tube 6 is located above the front plate 4. Connect the syringe to the injection pump. The injection pump drives the push rod 3, which in turn drives the piston 2 to move forward, expelling excess air above the liquid in the syringe barrel 1. A small amount of air remains in the syringe barrel 1. At this time, the piston 2 stops moving. ③ Separate the syringe from the injection pump, rotate the syringe axially 180° so that the liquid outlet tube 6 is located at the lower part of the front plate 4, reconnect the syringe to the injection pump, and use a hose to connect the syringe to the reactor. ④ Read the length of the liquid column inside the syringe 1 from the length scale 14, input the value and injection time into the syringe pump, and start the injection dripping.

[0029] This invention discloses a syringe for laboratory use and its method of use. The syringe body 1 can be made of transparent glass and is in the shape of a hollow cylinder. A front plate 4 is provided at one end of the syringe body 1, and a rear plate 5 is provided at the other end. A corrosion-resistant sealing gasket 26 can be provided at the contact point between the syringe body 1 and the front plate 4, and a common elastic gasket 27 can be provided at the contact point between the syringe body 1 and the rear plate 5. A piston 2 is provided inside the syringe body 1. The front plate 4 and the piston 2 can be made of corrosion-resistant stainless steel, titanium, or polyethylene. Made of materials such as PTFE or polypropylene, the rear plate 5 can be made of stainless steel. A push-pull rod 3 is installed at one end of the piston 2, and the rear end of the push-pull rod 3 passes through the perforation 9 of the rear plate 5. A liquid outlet short tube 6 and a feed inlet 7 are installed in the front plate 4. The liquid outlet short tube 6 is located on the vertical center line of the front plate 4, and the inner wall edge of the liquid outlet short tube 6 is close to the inner wall edge of the injection cylinder 1 (due to the manufacturing process of the injection cylinder 1, the inner diameter of each injection cylinder 1 has an error of 1-2 mm; the liquid outlet short tube 6, feed inlet 7, and...). The cleaning port 10 is designed with the smallest possible inner diameter of the syringe barrel 1 and a small safety distance is reserved. Therefore, all openings can only be close to the inner wall of the syringe barrel 1, but cannot be completely flush. The inlet 7 and the cleaning port 10 are slightly further away from the inner wall of the syringe barrel 1, which has little impact on draining the cleaning liquid. However, the outlet short tube 6 is as close as possible to the inner wall of the syringe barrel 1 to reduce liquid residue in the syringe barrel 1 after injection. When using this syringe for injection, first insert the outlet short tube 6 into the tubing to be drawn up with the liquid 18. By pulling the push rod 3, the push rod 3 drives the piston 2 to move backward, so that the liquid 18 is drawn into the syringe barrel 1 through the outlet short tube 6. Alternatively, open the plug 8 and add the liquid 18 directly from the inlet 7, and then seal it with the plug 8. At this time, since there is a lot of air left in the syringe barrel 1, it is necessary to expel the excess air. Therefore, place the syringe horizontally so that the outlet short tube 6 is located on the upper part of the front plate 4. Connect the push rod 3 of the syringe to the injection pump 20 (e.g., Figure 7As shown, the specific structure of the syringe pump 20 is existing technology. The syringe pump can use a motor 21, and a controller can be installed on the motor 21. The controller can be used to input the length of the liquid column to be injected and the injection time, thereby controlling the speed and working time of the motor 21. The output shaft of the motor 21 is connected to a lead screw, and a lead screw nut 22 is provided on the lead screw. A protruding push-pull block 23 is provided on the lead screw nut. The two sides of the push-pull block 23 can be limited by the cover plate 24. A socket 25 is opened at the head of the push-pull rod 3. The push-pull rod 3 is fitted onto the push-pull block 23 through the socket 25 and driven by the motor 21. The lead screw rotates, causing the lead screw nut 22 to move back and forth. The lead screw nut 22, through the push-pull block 23, causes the push-pull rod 3 to move back and forth. The injection pump 20 can be fixed to the syringe by fasteners. During injection, the injection pump 20 drives the push-pull rod 3 to move forward, and the push-pull rod 3 drives the piston 2 to move forward. First, the air above the liquid is discharged from the liquid outlet short tube 6 at the top of the front plate 4 until only small air bubbles 19 remain (the volume of the remaining small air bubbles 19 can be determined according to the length and inner diameter of the hose connecting the liquid outlet short tube 6 to the reaction bottle, for example, the hose is 50cm long and the inner diameter is 1mm, the volume of the remaining small air bubbles 19 can be calculated based on the length and inner diameter of the hose connecting the liquid outlet short tube 6 to the reaction bottle). The volume inside the tube is approximately 0.4 ml, and the volume of the remaining small air bubbles needs to be greater than 0.4 ml. If the actual volume of the small air bubbles is 1-2 ml, the resulting dripping time error of less than 1% is acceptable for a total liquid volume of several hundred milliliters. However, if the total liquid volume is only tens of milliliters, the error may be too large. Several tests should be conducted beforehand, referring to the length scale on the syringe to determine the appropriate air bubble length. Then, separate the syringe from the injection pump 20, rotate the syringe axially 180° so that the dispensing short tube 6 is located below the front plate 4, while the small air bubbles 19 still float on top of the liquid 18, and then... Connect the syringe to the syringe pump 20, and connect the syringe to the reactor using a hose. Read the length of the liquid column in the syringe barrel 1 from the length scale 14. Input this value and the injection time into the syringe pump and start the injection dripping. Within the set time, gradually inject the required liquid 18 into the reaction bottle through the liquid outlet short tube 6 and the hose until all the liquid 18 in the syringe barrel 1 is squeezed out. Finally, squeeze the small air bubbles 19 from the liquid outlet short tube 6 into the hose. Through this air, squeeze out all the remaining small amount of liquid 18 in the hose, thus completing the timed and quantitative injection dripping in the laboratory.

[0030] During injection, a very thin layer of liquid will adhere to the inner wall of the injection cylinder 1 as the piston 2 passes through. After completion, if the liquid evaporates and leaves solute, water or a suitable solvent should be added through the cleaning port 10 to clean the solute. Then, the piston should be pulled back, and the feed port 7 should be opened to clean the front section of the inner wall of the injection cylinder 1. Alternatively, the piston can be pulled back to the rear end, the rear plate 5 can be removed, and the front plate 4 and connecting rod 11 can be taken off. The inner wall of the cylinder can be cleaned vigorously with a brush. The piston can be pulled out further to thoroughly clean the piston, sealing ring, and inner wall of the cylinder, and then reassembled.

[0031] Although the embodiments of this application disclose the above-described methods, the content is merely an implementation method adopted for ease of understanding. Any person skilled in the art should understand that any modifications and changes in the form and details of the implementation can be made without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. A syringe for laboratory use, comprising a syringe body (1), a piston (2) disposed therein, a push-pull rod (3) disposed at one end of the piston (2), a front plate (4) disposed at one end of the syringe body (1), and a rear plate (5) disposed at the other end of the syringe body (1), wherein a perforation (9) is formed in the rear plate (5), and one end of the push-pull rod (3) passes through the perforation (9), characterized in that: The front plate (4) is provided with a liquid outlet short pipe (6) and a feed inlet (7). The liquid outlet short pipe (6) is located on the vertical center line of the front plate (4). The inner wall edge of the liquid outlet short pipe (6) is close to the inner wall edge of the injection cylinder (1). A plug (8) is provided in the feed inlet (7). A cleaning port (10) is opened in the rear plate (5).

2. A syringe for laboratory use as described in claim 1, characterized in that: The edge of the feed inlet (7) is close to the inner wall edge of the injection cylinder (1).

3. A syringe for laboratory use as described in claim 2, characterized in that: The feed inlet (7) is provided with an internal thread, and the plug (8) is provided with an external thread. The plug and the feed inlet (7) are threaded together.

4. A syringe for laboratory use as described in claim 1, characterized in that: The edge of the cleaning port (10) is close to the inner wall edge of the injection cylinder (1).

5. A syringe for laboratory use as described in claim 1, characterized in that: More than three connecting rods (11) are provided on the outer wall of the injection cylinder (1) between the front plate (4) and the rear plate (5).

6. A syringe for laboratory use as described in claim 5, characterized in that: A length scale (14) is provided on one of the connecting rods (11).

7. A syringe for laboratory use as described in claim 1, characterized in that: The front plate (4) is provided with three or more support feet (17).

8. A syringe for laboratory use as described in claim 1, characterized in that: The piston (2) has a sealing groove (15) on its outer ring, and a perfluoroether rubber sealing ring (16) is provided in the sealing groove (15).

9. A method of using a syringe for laboratory use, the method employing a syringe for laboratory use as described in any one of claims 1-8, characterized in that, Includes the following steps: ① Insert the outlet tube (6) into the tubing to collect the liquid. Pull the push rod (3), which will cause the piston (2) to move backward, so that the liquid is drawn into the syringe (1) through the outlet tube (6). Alternatively, open the plug (8) and add the liquid directly from the feed port (7), and then seal it with the plug (8). ② Place the syringe horizontally so that the liquid outlet tube (6) is located above the front plate (4). Connect the syringe to the injection pump. Drive the push-pull rod (3) through the injection pump. The push-pull rod (3) drives the piston (2) to move forward, expelling the excess air above the liquid in the syringe barrel (1). A small amount of air remains in the syringe barrel (1). At this time, the piston (2) stops moving. ③ Separate the syringe from the injection pump, rotate the syringe axially 180° so that the liquid outlet tube (6) is located at the bottom of the front plate (4), reconnect the syringe to the injection pump, and use a hose to connect the syringe to the reactor; ④ Read the length of the liquid column inside the syringe (1) from the length scale (14), input the value and injection time into the syringe pump, and start the injection dripping.

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