Syringe gas transfer device

Abstract

The present application belongs to the technical field of gas test, and discloses a needle cylinder gas transfer device, which comprises a sleeve and a double-end needle. The inside of the sleeve is provided with a fixed block and a piston, and an installation cavity is defined between the piston, the fixed block and the inner wall of the sleeve. The needle heads at both ends of the double-end needle respectively pass through the fixed block and the piston. The double-end needle is internally provided with a floating ball. A gap for gas to pass through is formed between the floating ball and the inner wall of the double-end needle. The floating ball can move upwards and close the needle head above. The sidewall of the double-end needle is provided with a pressure relief hole. The installation cavity is filled with sealing liquid. In the vertical direction, the liquid level of the sealing liquid is above the pressure relief hole. By setting the floating ball, the piston and filling the sealing liquid, the needle cylinder gas transfer device is simple in structure and convenient to operate. The sealing liquid can achieve liquid sealing effect on the pressure relief hole, ensuring the purity of the gas sample in the sampling needle. The piston can eject the sampling needle after the gas sample is transferred, improving the stability and convenience of single-person operation.

Description

Technical Field

[0001] This invention relates to the field of gas testing technology, and more particularly to a syringe gas transfer device. Background Technology

[0002] In transformer safety maintenance, detecting dissolved gases in the transformer oil tank allows for the determination of the insulating oil's composition, thus assessing its safety and reliability, and effectively monitoring and preventing internal transformer faults. Before dissolved gas detection, the oscillating gas in the injection needle syringe (after being vibrated in a constant-temperature, timed oscillator) needs to be transferred to the sampling needle syringe. Traditionally, this transfer uses a micro-positive pressure method, requiring the operator to connect two syringes and maintain an upward driving force to push the needle core of the lower injection needle to transfer the gas. This process is challenging for a single person operating with both hands, and issues such as accidentally pulling out both needles together, causing air leakage, or over-pushing the needle, allowing insulating oil to enter the sampling needle syringe, can occur, affecting the accuracy of the test results. Summary of the Invention

[0003] The purpose of this invention is to provide a syringe gas transfer device that is simple and stable to operate, can automatically remove the needle, and ensure the purity of the gas sample.

[0004] To achieve this objective, the present invention employs the following technical solution: a syringe gas transfer device, comprising a sleeve and a double-ended needle, wherein a fixing block and a piston are provided inside the sleeve, and an installation cavity is defined between the piston, the fixing block, and the inner wall of the sleeve, and the piston is capable of moving up and down relative to the sleeve; the double-ended needle is connected to the fixing block and housed in the installation cavity, the needle tips at both ends of the double-ended needle respectively protrude from the fixing block and the piston, a float is provided inside the double-ended needle, a gap for gas to pass through is provided between the float and the inner wall of the double-ended needle, and the float is capable of moving upward and sealing the needle tip located above it, and a pressure relief hole is provided on the side wall of the double-ended needle; wherein, the installation cavity is filled with a sealing liquid, and in the vertical direction, the liquid level of the sealing liquid is located above the pressure relief hole.

[0005] Preferably, the double-ended needle includes a needle body and a sealing cap, the sealing cap being located below the needle body and connected to the needle body, and the float being housed within the needle body.

[0006] Preferably, the top of the float is provided with a first conical surface, and the inner wall of the needle body is provided with a second conical surface that matches the first conical surface.

[0007] Preferably, the float is configured as a flexible element.

[0008] Preferably, the inner wall of the sealing cap is provided with a third conical surface.

[0009] Preferably, the third conical surface is symmetrically arranged with respect to the second conical surface.

[0010] Preferably, the piston has a through hole through which the needle located above passes.

[0011] Preferably, the needle tips at both ends of the double-ended needle are housed within the sleeve.

[0012] Preferably, both the sleeve and the double-headed needle are made of transparent material.

[0013] Preferably, the outer wall of the double-headed needle is provided with a plurality of reinforcing ribs, which are spaced apart along the circumference of the double-headed needle.

[0014] The beneficial effects of this invention are as follows: After the testing personnel align the injection needle and sampling needle with the needle tips at both ends of the double-ended needle and insert them, they push the needle core of the injection needle. The gas sample in the injection needle enters the sampling needle through the gap between the float and the inner wall of the double-ended needle. When the gas sample is completely transferred, the insulating oil in the injection needle pushes up the float, which moves upward and seals the needle tip above, preventing the insulating oil from entering the sampling needle. As the internal pressure of the double-ended needle increases, the insulating oil flows out of the double-ended needle through the pressure relief hole and into the mounting cavity. With the continuous injection of insulating oil, the liquid in the mounting cavity pushes up the piston, thereby ejecting the sampling needle and achieving automatic needle removal. By setting up a float, piston, and filling with sealing liquid, the syringe gas transfer device has a simple structure and is easy to operate. The sealing liquid can also provide a liquid seal effect on the pressure relief hole, ensuring the purity of the gas sample in the sampling needle. The piston can eject the sampling needle after the gas sample is transferred, improving the stability and convenience of single-person operation. Attached Figure Description

[0015] Figure 1 This is a perspective view of the syringe gas transfer device of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the syringe gas transfer device of the present invention;

[0017] Figure 3 This is an exploded view of the double-headed needle of the present invention.

[0018] In the diagram: 100, sleeve; 110, fixing block; 120, piston; 130, mounting cavity; 140, sealing fluid; 200, double-ended needle; 210, needle tip; 220, float; 221, first conical surface; 230, needle body; 231, second conical surface; 232, reinforcing rib; 233, transition cavity; 240, sealing cap; 241, third conical surface. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] Reference Figures 1 to 3 As shown, a syringe gas transfer device according to an embodiment of this application includes a sleeve 100 and a double-ended needle 200. The sleeve 100 is provided with a fixing block 110 and a piston 120 inside. The fixing block 110 is fixed inside the sleeve 100 by means of snap-fit, adhesive thread connection, etc. The piston 120 is slidably assembled inside the sleeve 100 and located above the fixing block 110. An installation cavity 130 is defined between the piston 120, the fixing block 110 and the inner wall of the sleeve 100. The piston 120 can move up and down relative to the sleeve 100.

[0024] The double-ended needle 200 is connected to the fixing block 110 and housed in the mounting cavity 130. The needles 210 at both ends of the double-ended needle 200 protrude from the fixing block 110 and the piston 120, respectively. The double-ended needle 200 has a transition cavity communicating with the two needles 210. A floating float 220 is provided in the transition cavity. The inner diameter of a portion of the inner circumferential wall of the transition cavity is larger than the outer diameter of the float 220, and the inner diameter of the end of the transition cavity near the upper needle 210 is smaller than the outer diameter of the float 220. This creates a gap between the float 220 and the inner wall of the transition cavity, allowing gas to pass through. The float 220 can move upwards and close the upper needle 210. A pressure relief hole is provided on the side wall of the double-ended needle 200, and the transition cavity communicates with the mounting cavity 130 through the pressure relief hole. The mounting cavity 130 is filled with a sealing fluid 140, and in the vertical direction, the surface of the sealing fluid 140 is above the pressure relief hole. Optionally, the sealing fluid 140 can be insulating oil extracted on site, or other oil that does not absorb gas samples, which will not be elaborated here.

[0025] Understandably, during gas sample transfer, the testing personnel align the injection needle with the lower tip 210 of the double-ended needle 200 and insert it, then align the sampling needle with the upper tip 210 of the double-ended needle 200 and insert it. They then push the needle core of the injection needle, causing the gas sample in the injection needle to slightly lift the float 220, and then enter the sampling needle through the gap between the float 220 and the inner wall of the transition cavity. When the gas sample transfer is complete, the insulating oil in the injection needle lifts the float 220, causing the float 220 to move upwards and seal the upper needle tip 210, preventing insulating oil from entering the sampling needle. As the internal pressure of the double-ended needle 200 increases, the insulating oil flows out of the double-ended needle 200 through the pressure relief hole and into the mounting cavity 130. With the continuous injection of insulating oil, the liquid in the mounting cavity 130 will lift the piston 120, causing the piston 120 to move upwards and push the rubber sleeve at the end of the sampling needle, thereby ejecting the sampling needle and achieving automatic needle removal.

[0026] By setting up a float 220, a piston 120, and filling it with sealing liquid 140, the syringe gas transfer device has a simple structure and is easy to operate. The sealing liquid 140 can also act as a liquid seal for the pressure relief hole, ensuring the purity of the gas sample in the sampling needle. The piston 120 can push out the sampling needle after the gas sample is transferred, improving the stability and convenience of single-person operation.

[0027] It should be noted that if the sealing fluid 140 is pre-injected into the mounting cavity 130, the sealing fluid 140 may enter the transition cavity of the double-ended needle 200 through the pressure relief hole and then leak from the lower needle tip 210. Therefore, the testing personnel can inject the sealing fluid 140 after inserting the injection needle. In other words, the complete gas transfer procedure is as follows:

[0028] First, align the injection needle with the needle 210 below and insert it;

[0029] The second step is to inject sealing fluid 140 into the mounting cavity 130 and make the sealing fluid 140 overflow the pressure relief hole;

[0030] The third step is to insert piston 120 so that the needle 210 above passes through piston 120;

[0031] Fourth step, align the sampling needle with the upper needle 210 and insert it;

[0032] Fifth step, push the needle core of the injection needle until the piston 120 pushes out the sampling needle above.

[0033] After inserting the injection needle, inject sealing fluid 140. Use the rubber sleeve and inner cavity of the injection needle to seal the needle tip 210 below, preventing the sealing fluid 140 from leaking out and ensuring the airtightness of the entire gas sample transfer process.

[0034] It should be noted that the liquid level of the sealing fluid 140 (i.e., the pre-injected amount of sealing fluid 140) is related to the position of the pressure relief hole. If the pressure relief hole is positioned higher relative to the middle section of the double-ended needle 200, the liquid level of the sealing fluid 140 will be higher; if the pressure relief hole is positioned lower relative to the middle section of the double-ended needle 200, the liquid level of the sealing fluid 140 will be lower. No specific limitations are made on the position of the pressure relief hole and the liquid level of the sealing fluid 140, as long as the sealing fluid 140 can effectively seal the pressure relief hole and ensure that the gas sample can flow in the transition chamber.

[0035] Furthermore, both the sleeve 100 and the double-headed needle 200 are made to be transparent.

[0036] Both the sleeve 100 and the double-ended needle 200 are made transparent, allowing inspectors to directly observe the gas transfer and insulating oil flow in the double-ended needle 200 through the transparent sleeve 100 and double-ended needle 200, effectively improving the observability of the syringe gas transfer device.

[0037] Furthermore, the outer wall of the double-headed needle 200 is provided with multiple reinforcing ribs 232, the reinforcing ribs 232 are trapezoidal in shape, and the multiple reinforcing ribs 232 are arranged at intervals along the circumference of the double-headed needle 200.

[0038] By setting reinforcing ribs 232, the strength and rigidity of the double-ended needle 200 can be effectively enhanced, preventing the double-ended needle 200 from bending, deforming or breaking during use, thereby ensuring that the gas can be transferred stably and accurately into the sampling needle, and effectively extending the service life of the double-ended needle 200.

[0039] Reference Figure 1 As shown, it can be understood that the needle tips 210 at both ends of the double-ended needle 200 are housed within the sleeve 100. In other words, along the radial direction of the sleeve 100, the length of the sleeve 100 is greater than the length of the double-ended needle 200, and the double-ended needle 200 is located between the end faces on both sides of the sleeve 100.

[0040] The double-ended needle 200 is housed within the sleeve 100. On one hand, the sleeve 100 can conceal the needle tips 210 at both ends of the double-ended needle 200, preventing personnel from being pricked or injured by the needle tips 210 during use, thus effectively improving the safety of the syringe gas transfer device. On the other hand, the openings at both ends of the sleeve 100 can guide the movement of the rubber sleeves at the ends of the injection needle and the sampling needle, enabling the needle tip 210 to stably pierce the rubber sleeve and connect with the injection needle and the sampling needle, further improving the ease of use of the syringe gas transfer device.

[0041] Furthermore, the piston 120 is provided with a through hole through which the needle 210 located above passes, and the needle 210 is in clearance fit with the through hole.

[0042] By setting a through hole, when the user inserts the piston 120, the needle 210 passes through the through hole, which can avoid the needle 210 directly piercing the piston 120, the piston 120 debris clogging the needle 210, and contaminating the gas sample, thus effectively improving the structural rationality of the syringe gas transfer device.

[0043] Reference Figure 2 and Figure 3 As shown, the double-ended needle 200 includes a needle body 230 and a sealing cap 240. The sealing cap 240 is located below the needle body 230 and connected to it. The sealing cap 240 and the needle body 230 cooperate to form a transition cavity. The pressure relief hole is opened on the side wall of the needle body 230 or the side wall of the sealing cap 240. Optionally, the sealing cap 240 can be detachably connected to the needle body 230 by means of snap-fit, plug-in, threaded connection, etc., or it can be directly bonded or welded to the needle body 230 for fixation, which will not be elaborated here. The float 220 of the needle body 230 is housed within the needle body 230, and needle tips 210 are respectively provided on the opposite sides of the needle body 230 and the sealing cap 240.

[0044] By setting the needle body 230 and the sealing cap 240, users can easily install and remove the float 220 and clean the double-ended needle 200, making the double-ended needle 200 reusable and reducing the operating cost of the syringe gas transfer device.

[0045] Furthermore, the top of the float 220 is provided with a first conical surface 221 that is smaller at the top and larger at the bottom, and the inner wall of the needle body 230 is provided with a second conical surface 231 that matches the first conical surface 221.

[0046] By setting the first conical surface 221 and the second conical surface 231, when the injection needle injects insulating oil into the transition cavity inside the double-ended needle 200, the insulating oil lifts the float 220, so that the first conical surface 221 on the float 220 and the second conical surface 231 on the inner wall of the needle body 230 correspond to each other and fit together, effectively increasing the sealing area between the float 220 and the inner wall of the needle body 230, and enhancing the sealing effect of the float 220.

[0047] Furthermore, the float 220 is configured as a flexible component made of lightweight rubber or soft rubber.

[0048] The float 220 is configured as a flexible component. As the injection needle continuously injects insulating oil, the pressure in the transition cavity increases. The insulating oil presses against the float 220, thereby causing the float 220 to deform slightly. This increases the stress between the inner walls of the float 220 and the needle body 230, improves the fit between the first conical surface 221 and the second conical surface 231, and further enhances the sealing effect of the float 220.

[0049] Reference Figure 3 As shown, it can be understood that the inner wall of the sealing cover 240 is provided with a third conical surface 241 that is larger at the top and smaller at the bottom.

[0050] By setting the third conical surface 241, when the injection needle injects gas sample into the transition cavity inside the double-ended needle 200, the third conical surface 241 can guide the gas sample diffusion, reduce the pressure and speed of the gas sample, and prevent the gas sample from rapidly pushing the float 220 to close the upper needle head 210, which would affect the gas sample transmission and effectively improve the smoothness of use of the syringe gas transfer device.

[0051] Furthermore, the third conical surface 241 is symmetrically arranged with the second conical surface 231. In other words, the third conical surface 241 can also fit with the first conical surface 221.

[0052] With the third conical surface 241 symmetrically arranged with the second conical surface 231, and the needle body 230 connected to the sealing cap 240, the double-ended needle 200 has a symmetrical spindle shape. The pressure relief hole is located on the side wall of the needle body 230. In this configuration, the double-ended needle 200 can be used normally regardless of whether the float 220 inside the needle body 230 is installed correctly or incorrectly. Users do not need to disassemble the sealing cap 240 to reinstall the incorrectly installed float 220, effectively improving the fault tolerance of the double-ended needle 200. In particular, the sealing cap 240 can also be symmetrical with the needle body 230, thus facilitating the design and manufacturing of the double-ended needle 200 and reducing its production cost.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A syringe gas transfer device, characterized in that, include: A sleeve (100) is provided with a fixing block (110) and a piston (120) inside. An installation cavity (130) is defined between the piston (120), the fixing block (110) and the inner wall of the sleeve (100). The piston (120) is slidably fitted inside the sleeve (100) and located above the fixing block (110). The piston (120) can move up and down relative to the sleeve (100). A double-ended needle (200) is connected to the fixing block (110) and housed in the mounting cavity (130). The needles (210) at both ends of the double-ended needle (200) pass through the fixing block (110) and the piston (120) respectively. A float (220) is provided inside the double-ended needle (200). There is a gap between the float (220) and the inner wall of the double-ended needle (200) for gas to pass through. The float (220) can move upward and close the needle (210) located above. A pressure relief hole is provided on the side wall of the double-ended needle (200). After the double-ended needle (200) is inserted into the injection needle, a sealing liquid (140) is injected into the mounting cavity (130). In the vertical direction, the liquid level of the sealing liquid (140) is located above the pressure relief hole.

2. The syringe gas transfer device according to claim 1, characterized in that, The double-headed needle (200) includes a needle body (230) and a sealing cap (240). The sealing cap (240) is located below the needle body (230) and connected to the needle body (230). The float (220) is housed within the needle body (230).

3. The syringe gas transfer device according to claim 2, characterized in that, The top of the float (220) is provided with a first conical surface (221), and the inner wall of the needle body (230) is provided with a second conical surface (231) that matches the first conical surface (221).

4. The syringe gas transfer device according to claim 3, characterized in that, The float (220) is configured as a flexible component.

5. The syringe gas transfer device according to claim 3, characterized in that, The inner wall of the sealing cap (240) is provided with a third conical surface (241).

6. The syringe gas transfer device according to claim 5, characterized in that, The third conical surface (241) is symmetrically arranged with respect to the second conical surface (231).

7. The syringe gas transfer device according to any one of claims 1-6, characterized in that, The piston (120) has a through hole through which the needle (210) located above passes.

8. The syringe gas transfer device according to any one of claims 1-6, characterized in that, The needle tips (210) at both ends of the double-ended needle (200) are housed within the sleeve (100).

9. The syringe gas transfer device according to any one of claims 1-6, characterized in that, Both the sleeve (100) and the double-headed needle (200) are made of transparent material.

10. The syringe gas transfer device according to any one of claims 1-6, characterized in that, The outer wall of the double-headed needle (200) is provided with a plurality of reinforcing ribs (232), and the plurality of reinforcing ribs (232) are arranged at intervals along the circumference of the double-headed needle (200).

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