Nitrogen blowing needle and nitrogen blowing mechanism
By designing a nitrogen blowing needle and nitrogen blowing mechanism, simultaneous collection of nitrogen blowing and evaporation mixed gas was achieved, solving the problems of inaccurate concentration ratio control and low automation in the concentration process of small volume samples in existing nitrogen blowing instruments, and improving the automation level of the equipment and the accuracy of the concentration process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU KERUI TECH CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-29
AI Technical Summary
Existing nitrogen blowing devices cannot accurately control the concentration ratio during the concentration of small-volume samples. The photoelectric sensor is easily affected by sample absorption and cannot evaluate the evaporation rate in real time, resulting in low automation of the equipment and the inability to simultaneously blow nitrogen and collect the evaporated mixed gas.
Design a nitrogen blowing needle and nitrogen blowing mechanism. The coaxial needle structure realizes nitrogen blowing and evaporation of mixed gas collection. The design of inner and outer tubes and the structure of air inlet are combined with the installation connector and diverter valve to realize the nitrogen channel. The design of inner and outer tubes realizes the nitrogen channel and realizes the simultaneous collection of nitrogen.
This invention enables the simultaneous collection of evaporated mixed gases generated during solvent concentration via nitrogen blowing. It features a simple structure, convenient collection, improved automation and accuracy of the concentration process, and reduced production costs.
Smart Images
Figure CN224303411U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nitrogen blowing device technology, and more specifically, to a nitrogen blowing needle and a nitrogen blowing mechanism. Background Technology
[0002] Nitrogen blowing concentrators are a commonly used sample pretreatment technique, most commonly using water as the liquid bath medium. The working principle involves placing a concentration cup containing the liquid sample in a water bath. Heating the liquid in the water bath transfers heat to the concentration cup, increasing the evaporation rate of the liquid sample by raising its temperature. Simultaneously, an inert gas (nitrogen) is used as an auxiliary concentrator, continuously blown onto the liquid surface of the concentration cup through a nitrogen blowing needle. This serves two purposes: firstly, to prevent sample medium loss during concentration; and secondly, the nitrogen gas naturally settles, facilitating the removal of gases generated during evaporation and thus accelerating the concentration process.
[0003] like Figure 1 As shown, the gas path structure of currently available nitrogen purging apparatuses includes a nitrogen splitter tube and multiple nitrogen purging needles. The inlet end of the nitrogen splitter tube is connected to a gas source, and the outlet end of the nitrogen splitter tube is connected to multiple nitrogen purging needles. Additionally, control valves are installed at each outlet of the nitrogen splitter tube for convenient control of the multiple nitrogen purging needles. When using this gas path structure to purge solvent in a concentration cup, the volume of the solvent in the concentration cup gradually decreases, thereby achieving solvent concentration.
[0004] In the existing technology, in order to facilitate the monitoring of the solvent concentration process, a common technique is to install a pair of photoelectric sensors on the outside of the concentration cup near the bottom. When the liquid level drops below the photoelectric sensors due to solvent evaporation, the photoelectric sensors will send a signal to control the valve to close, thereby stopping nitrogen blowing. However, this monitoring method has the following problems: 1. This technique is generally suitable for the concentration of large-volume samples and cannot accurately control the concentration ratio of samples with only a few milliliters; 2. When the sample to be volume-determined absorbs the light waves emitted by the photoelectric sensor, this monitoring method will completely fail; 3. Since this technique is generally suitable for the concentration of large-volume samples, the diameter of the concentration cup is generally very large. Therefore, the number of samples concentrated by the nitrogen blower using this method within a unit projected area is unlikely to be very large; 4. Since the evaporation rate of the solvent in each concentration cup cannot be evaluated during the concentration process, when a large number of large-volume samples need to be concentrated and volume-determined, there will be a problem of large differences in the concentration rate. In order to prevent the solvent from evaporating abnormally due to long waiting time for samples that have been volume-determined in advance, thus affecting the accuracy of volume determination, the solvent concentration process needs to be constantly observed by humans so that samples that have been volume-determined can be taken out in advance, which reduces the automation level of the equipment.
[0005] To address the aforementioned issues, a method for determining the degree of solvent concentration by detecting the content of volatile organic compounds in the evaporated mixed gas during solvent concentration is proposed. However, this method requires collecting the evaporated mixed gas simultaneously with nitrogen blowing. Existing nitrogen blowing instruments only blow nitrogen gas through their nitrogen blowing needles and cannot collect the evaporated mixed gas at the same time. Therefore, there is an urgent need for a nitrogen blowing needle and nitrogen blowing mechanism that can be used in conjunction with this method. Utility Model Content
[0006] The purpose of this invention is to provide a nitrogen blowing needle and nitrogen blowing mechanism that can collect the evaporated mixed gas generated during the solvent concentration process while blowing nitrogen gas. It has a simple structure and is easy to collect.
[0007] To achieve the purpose of this utility model, the technical solution adopted is as follows: a nitrogen blowing needle, including a mounting connector and a coaxial needle, wherein the mounting connector has a common channel port A, a channel port B, and a channel port C, and the coaxial needle is installed in the channel port A; the coaxial needle includes an inner tube and an outer tube arranged coaxially and radially at intervals, and the inner tube and the outer tube are respectively connected to the channel port B and the channel port C.
[0008] Furthermore, an air inlet is provided on the circumferential surface of the outer tube, which communicates with its interior.
[0009] Furthermore, the needle tip of the inner tube is flush with the needle tip of the outer tube, or the needle tip of the inner tube extends outward from the needle tip of the outer tube.
[0010] Furthermore, the needle tip diameter of the inner tube is smaller than the diameter of the inner tube inlet end, and / or the needle tip diameter of the outer tube is smaller than the diameter of the outer tube outlet end.
[0011] Furthermore, the tip of the outer tube is conical.
[0012] Furthermore, there are multiple air inlets, which are evenly spaced along the circumference of the outer tube.
[0013] Furthermore, channel A and channel B are arranged coaxially, and the diameter of channel A is larger than the diameter of channel B. Channel C is connected to channel A. The outer tube is fixed inside channel A, and the inner tube passes through channel A and is fixed inside channel B.
[0014] Furthermore, the end of the mounting connector away from the coaxial pin is provided with a connecting thread, which is located on the wall of the hole at the channel opening B or on the outer wall of the mounting connector.
[0015] Furthermore, the outer circular surface of the mounting joint is also fitted with multiple sealing rings, which are located on both sides of the channel opening C.
[0016] Furthermore, an annular groove is formed on the outer circular surface of the mounting joint, and the outer end of the channel opening C is located inside the annular groove.
[0017] Furthermore, the outer wall of the mounting joint is divided into three sections, with the annular groove located in the middle section of the mounting joint.
[0018] Furthermore, the diameter of the outer wall of the mounting joint gradually decreases, and the large-diameter end of the mounting joint is also provided with anti-slip texture.
[0019] A nitrogen blowing mechanism, comprising a nitrogen blowing needle as described above.
[0020] The beneficial effects of this utility model are:
[0021] The nitrogen blowing needle provided by this utility model can collect the evaporated mixed gas generated during the solvent concentration process while blowing nitrogen. This allows the solvent concentration degree to be determined by detecting the content of volatile organic compounds in the evaporated mixed gas during the solvent concentration process. It is not only simple in structure and convenient in data collection, but also allows the nitrogen blowing needle to be directly installed on the diverter valve during use. This eliminates the need for pipeline connection between the coaxial needle and the diverter valve, making the structure simpler when multiple coaxial needles are arranged together, and reducing the production cost of the equipment. Attached Figure Description
[0022] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.
[0023] Figure 1 This is a cross-sectional view of the nitrogen blowing needle provided by this utility model;
[0024] Figure 2 This is a cross-sectional view of another embodiment of the nitrogen blowing needle provided by this utility model;
[0025] Figure 3 This is a cross-sectional view of another embodiment of the nitrogen blowing needle provided by this utility model;
[0026] Figure 4 This is a structural diagram of the installation connector;
[0027] Figure 5 This is a sectional view of the mounting connector;
[0028] Figure 6 This is a front view of the nitrogen blowing mechanism provided by this utility model;
[0029] Figure 7 This is a cross-sectional view of the nitrogen blowing mechanism provided by this utility model.
[0030] The attached diagram shows the markings and corresponding component names:
[0031] 1. Installation connector; 2. Coaxial pin; 3. Flow divider valve;
[0032] 1-1. Channel opening A; 1-2. Channel opening B; 1-3. Channel opening C; 1-4. Annular groove; 1-5. Sealing ring; 1-6. Connecting thread; 1-7. Anti-slip texture.
[0033] 2-1. Outer tube; 2-2. Inner tube; 2-3. Air inlet;
[0034] 3-1. Installation port; 3-2. Nitrogen channel; 3-3. Gas collection channel; 3-4. VOC sensor. Detailed Implementation
[0035] 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 for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.
[0036] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0037] like Figures 1 to 5 As shown, the present invention provides a nitrogen blowing needle, including a mounting connector 1 and a coaxial needle 2. The mounting connector 1 is not only used for mounting the coaxial needle 2, but also for connecting the coaxial needle 2 and the flow divider valve 3. The mounting connector 1 has a channel port A1-1, a channel port B1-2, and a channel port C1-3, which are all connected. The coaxial needle 2 is installed in the channel port A1-1.
[0038] In this embodiment, the coaxial needle 2 includes an inner tube 2-2 and an outer tube 2-1. The inner tube 2-2 is located inside the outer tube 2-1. The central axis of the inner tube 2-2 and the central axis of the outer tube 2-1 are on the same straight line, and both ends of the inner tube 2-2 and the outer tube 2-1 are open. There is a certain gap between the outer wall of the inner tube 2-2 and the inner wall of the outer tube 2-1, so that an airflow channel is formed between the outer wall of the inner tube 2-2 and the inner wall of the outer tube 2-1. When the coaxial needle 2 is installed in the channel opening A1-1, the inner tube 2-2 is connected to the channel opening B1-2, and the airflow channel formed between the outer wall of the inner tube 2-2 and the inner wall of the outer tube 2-1 is connected to the channel opening C1-3.
[0039] By using the joint 1 and coaxial needle 2 together, when the solvent needs to be concentrated, nitrogen can be blown out through the channel port B1-2 and the inner tube 2-2. The evaporation mixture generated during the solvent concentration process can enter the airflow channel between the outer wall of the inner tube 2-2 and the inner wall of the outer tube 2-1 through the needle tip of the outer tube 2-1, and finally be discharged through the channel port C1-3 to be sent to the next process.
[0040] To prevent the nitrogen gas blown out from the inner tube 2-2 from being directly drawn into the evaporated gas mixture through the outer tube 2-1, the needle tip of the outer tube 2-1 is sealed, and multiple air inlets 2-3 communicating with its interior are provided on the circumferential surface of the outer tube 2-1. These multiple air inlets 2-3 are arranged at intervals along the circumference of the outer tube 2-1. Alternatively, there can be multiple sets of air inlets 2-3 on the outer tube 2-1, with multiple air inlets 2-3 in the same set arranged at intervals along the circumference of the outer tube 2-1, or multiple sets of air inlets 2-3 arranged at intervals along the axis of the outer tube 2-1, with the air inlets 2-3 in adjacent sets staggered. When it is necessary to draw out the evaporated gas mixture generated during the concentration process, the evaporated gas mixture enters the outer tube 2-1 through the air inlets 2-3 and is finally discharged through the channel port C1-3.
[0041] To facilitate the insertion of the coaxial needle 2 into the test tube, the tip of the outer tube 2-1 is conical, and the tip of the outer tube 2-1 is flush with the tip of the inner tube 2-2. This allows the tip of the outer tube 2-1 to be welded onto the inner tube 2-2, thus achieving a seal and making the forming of the coaxial needle 2 more convenient.
[0042] In this embodiment, while ensuring that the needle tip of the outer tube 2-1 is closed, the needle tip of the inner tube 2-2 can also be conical; alternatively, the inner tube 2-2 can be a straight tube, with the needle tip of the inner tube 2-2 extending outward from the outer tube 2-1, such as... Figure 6 As shown; alternatively, the needle tip of the inner tube can be directly set as a small-diameter thin tube, and the needle tip of the inner tube can be made to transition to the rear end of the inner tube in a conical shape, such as... Figure 7 As shown. Of course, the needle tip shape and diameter of the outer tube 2-1 and the needle tip shape and diameter of the inner tube 2-2 can be designed according to actual needs.
[0043] To facilitate the installation of the inner tube 2-2 and the outer tube 2-1 on the mounting connector 1, the channel openings A1-1 and B1-2 are arranged coaxially, and the central axis of both the channel A and the channel B1-2 is on the same straight line as the central axis of the mounting connector 1. At the same time, the diameter of the channel opening A1-1 is larger than the diameter of the channel opening B1-2, and the channel opening C1-3 is connected to the channel opening A1-1. During installation, the outer tube 2-1 is directly inserted and fixed in the channel opening A1-1, while the inner tube 2-2 is directly passed through the channel opening A1-1 and fixed in the channel opening B1-2. This separates the channel in the inner tube 2-2 from the channel in the outer tube 2-1, preventing the nitrogen to be blown out from mixing with the vaporized mixed gas to be collected.
[0044] It should be noted that, in order to avoid the outer pipe 2-1 covering the channel opening C1-3 during installation, the outer pipe 2-1 should be installed with a certain distance between its installation end and the channel opening C1-3, so as to ensure that the channel opening C1-3 is open and that the collected evaporative mixed gas can be discharged normally from the installation joint 1.
[0045] To facilitate the installation of the nitrogen injection needle onto the diverter valve 3, a connecting thread 1-6 is provided at the end of the mounting connector 1 furthest from the coaxial needle 2. This connecting thread 1-6 is located on the outer wall of the mounting connector 1 and is an external thread. When the nitrogen injection needle needs to be installed, the mounting connector 1 can be directly tightened and fixed onto the diverter valve 3, making the installation of the nitrogen injection needle faster and more convenient. In this utility model, when the mounting port 3-1 on the diverter valve 3 for mounting connector 1 is an external thread, the connecting thread 1-6 on the mounting connector 1 can also be an internal thread. In this case, the connecting thread 1-6 is located on the inner wall of the channel opening B1-2. That is, the selection of the connecting thread 1-6 on the mounting connector 1 can be determined according to the thread at the mounting port 3-1 on the diverter valve 3, thereby ensuring that the installation of the mounting connector 1 is more convenient.
[0046] To ensure a better seal between the mounting connector 1 and the diversion valve 3 when the mounting connector 1 is installed on the diversion valve 3, at least a plurality of sealing rings 1-5 are fitted on the outer circumference of the mounting connector 1. These sealing rings 1-5 are divided into two groups, located on either side of the channel opening C1-3. This prevents gas from leaking through the gap between the outer wall of the mounting connector 1 and the mounting port 3-1 of the diversion valve 3 when the nitrogen injection needle is installed on the diversion valve 3, thus ensuring both the nitrogen injection rate and the amount of collected evaporated mixed gas. In this invention, the number of sealing rings 1-5 can be two, three, four, etc., and the specific selection of sealing rings 1-5 can be determined according to the actual situation.
[0047] When the mounting connector 1 is installed on the diversion valve 3, in order to ensure the connectivity between the diversion valve 3 and the channel port C1-3, an annular groove 1-4 is also provided on the outer wall of the mounting connector 1, and the outer end of the channel port C1-3 is located in the annular groove 1-4. When the nitrogen blowing needle is installed on the diversion valve 3, the annular groove 1-4 and the mounting port 3-1 on the diversion valve 3 cooperate to form an annular chamber, so that the channel port C1-3 and the flow channel on the diversion valve 3 can be connected through the annular chamber. This makes it possible to install the nitrogen blowing needle without the need for precise alignment between the channel port C1-3 and the flow channel on the diversion valve 3, making the installation of the nitrogen blowing needle faster and more convenient.
[0048] To facilitate the installation of the mounting connector 1, its outer wall can be designed as a three-section structure. The outer diameter of the mounting connector 1 gradually increases from the end installed on the diverter valve 3 to the end where the coaxial needle 2 is installed. The annular groove 1-4 is located on the middle section of the mounting connector 1, and the connecting thread 1-6 is located on the small diameter section of the mounting connector 1. During installation, the small diameter section and the middle section of the mounting connector 1 are located inside the installation port 3-1 of the diverter valve 3, while the large diameter section of the mounting connector 1 is located outside the installation port 3-1 of the diverter valve 3. This allows the operator to easily hold the large diameter section of the mounting connector 1 for installation or removal. To prevent the operator's hand from slipping while tightening the mounting connector 1, anti-slip grooves 1-7 are also provided on the large diameter section of the mounting connector 1.
[0049] Since the outer wall of the mounting joint 1 has a three-section structure, during installation, one set of sealing rings 1-5 fitted on the mounting joint 1 can be directly fitted onto the small diameter section of the mounting joint 1. The connection between the small diameter section and the middle section of the mounting joint 1 restricts the sealing ring 1-5, preventing axial displacement of the sealing ring 1-5 on the mounting joint 1. At the same time, to facilitate the installation of the other set of sealing rings 1-5, a sealing ring groove 1-4 for installing the other set of sealing rings 1-5 is provided on the middle section of the mounting joint 1, and the sealing ring 1-5 is embedded in the sealing ring groove 1-4.
[0050] like Figure 6 , Figure 7As shown, this embodiment also provides a nitrogen blowing mechanism, including a diversion valve 3 and a nitrogen blowing needle as described above. The diversion valve 3 is provided with a nitrogen channel 3-2, a gas collection channel 3-3 and a mounting port 3-1. The nitrogen channel 3-2 is used to deliver the nitrogen required for nitrogen blowing to the inner tube 2-2 of the coaxial needle 2. The gas collection channel 3-3 is used to deliver the evaporated mixed gas collected through the outer tube 2-1. The mounting port 3-1 is used to install the mounting connector 1 on the coaxial needle 2. Since the nitrogen required for nitrogen blowing needs to enter the inner tube 2-2 through the installation connector 1, and the evaporated mixed gas collected by the outer tube 2-1 needs to enter the gas collection channel 3-3 through the installation connector 1, the outlet of the nitrogen channel 3-2 on the diverter valve 3 and the inlet of the gas collection channel 3-3 are both connected to the installation port 3-1. The inner wall of the installation port 3-1 has an internal thread that matches the connecting thread 1-6 on the installation connector 1. When the installation connector 1 is tightened in the installation port 3-1, the channel port B1-2 is connected to the outlet of the nitrogen channel 3-2, and the channel port C1-3 is connected to the inlet of the gas collection channel 3-3 through the annular groove 1-4.
[0051] To enable timely detection of the collected evaporating gas mixture, a VOC sensor 3-4 is installed within the gas collection channel 3-3. This allows for real-time detection of the collected evaporating gas mixture as it flows through the gas collection channel 3-3, enabling analysis of the solvent concentration level in the concentration cup based on the detection results. In this embodiment, since the method of determining the solvent concentration level by detecting the volatile organic compound content in the evaporating gas mixture during solvent concentration is not protected by this invention, and this invention only protects the related equipment structure used in this method, the specific analysis method and steps of the VOC sensor 3-4 after detecting the evaporating gas mixture are not described here.
[0052] Since nitrogen blowing equipment typically concentrates solvent in multiple concentration cups simultaneously, it also requires multiple nitrogen blowing needles, each corresponding to one concentration cup. To simplify and streamline the nitrogen blowing equipment, the diversion valve 3 can be equipped with multiple nitrogen channels 3-2, multiple gas collection channels 3-3, and multiple mounting ports 3-1. Each mounting port 3-1 corresponds to one nitrogen channel 3-2 and one gas collection channel 3-3. Multiple coaxial needles 2 are installed in the multiple mounting ports 3-1, and the inlets of the multiple nitrogen channels 3-2 are connected together, as are the outlets of the multiple gas collection channels 3-3. Each gas collection channel 3-3 is equipped with a VOC sensor 3-4, meaning each VOC sensor 3-4 can detect the evaporation mixture generated during solvent concentration in one concentration cup, thus monitoring the concentration status of the solvent in each concentration cup.
[0053] When it is necessary to concentrate the solvent in the concentration cup, connect the inlets of multiple nitrogen channels 3-2 on the diversion valve 3 to a nitrogen source, and connect the outlets of multiple gas collection channels 3-3 on the diversion valve 3 to an exhaust pipe. Then, tighten the coaxial needle 2 into the mounting port 3-1 on the diversion valve 3 using the connecting thread 1-6 on the mounting connector 1. At this time, the channel port B1-2 on the nitrogen blowing needle is connected to the nitrogen channel 3-2 on the diversion valve 3, while the channel port C1-3 on the nitrogen blowing needle is connected to the gas collection channel 3-3 on the diversion valve 3. Then, nitrogen can enter the channel port B1-2 through the nitrogen channel 3-2 on the diversion valve 3, and the nitrogen entering the channel port B1-2 enters the inner... The solvent is purged through nitrogen through pipe 2-2 and finally discharged through inner pipe 2-2. At the same time, the evaporated mixed gas generated by the solvent during the nitrogen purging process enters the airflow channel between the outer wall of inner pipe 2-2 and the inner wall of outer pipe 2-1 through air inlet 2-3, and finally exits through channel port C1-3 and is sent to the gas collection channel 3-3 in the diversion valve 3. While the evaporated mixed gas passes through the gas collection channel 3-3, the VOC sensor 3-4 detects it and transmits the detection data to the detection equipment for detection, thereby analyzing the concentration degree of the solvent in the concentration cup. After the evaporated mixed gas enters the gas collection channel 3-3 and is detected by VOC sensor 3-4, it is discharged through the exhaust pipe.
[0054] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.
Claims
1. A nitrogen blowing needle, characterized in that, The device includes a mounting connector (1) and a coaxial pin (2). The mounting connector (1) has a common channel port A (1-1), a channel port B (1-2), and a channel port C (1-3), and the coaxial pin (2) is installed in the channel port A (1-1). The coaxial pin (2) includes an inner tube (2-2) and an outer tube (2-1) arranged coaxially and radially. The inner tube (2-2) and the outer tube (2-1) are respectively connected to the channel port B (1-2) and the channel port C (1-3).
2. The nitrogen blowing needle according to claim 1, characterized in that, The outer tube (2-1) has an air inlet (2-3) that communicates with its interior on its circumferential surface; there are multiple air inlets (2-3), and the multiple air inlets (2-3) are evenly spaced along the circumferential direction of the outer tube (2-1).
3. The nitrogen blowing needle according to claim 1, characterized in that, The needle tip of the inner tube (2-2) is flush with the needle tip of the outer tube (2-1), or the needle tip of the inner tube (2-2) extends outward from the needle tip of the outer tube (2-1).
4. The nitrogen blowing needle according to claim 1, characterized in that, The needle tip diameter of the inner tube (2-2) is smaller than the diameter of the inlet end of the inner tube (2-2), and / or the needle tip diameter of the outer tube (2-1) is smaller than the diameter of the outlet end of the outer tube (2-1).
5. The nitrogen blowing needle according to claim 4, characterized in that, The tip of the outer tube (2-1) is conical.
6. The nitrogen blowing needle according to claim 1, characterized in that, The channel opening A (1-1) and the channel opening B (1-2) are arranged coaxially, and the diameter of the channel opening A (1-1) is larger than the diameter of the channel opening B (1-2). The channel opening C (1-3) is connected to the channel opening A (1-1). The outer tube (2-1) is fixed inside the channel opening A (1-1), and the inner tube (2-2) passes through the channel opening A (1-1) and is fixed inside the channel opening B (1-2).
7. The nitrogen blowing needle according to claim 1 or 6, characterized in that, The mounting connector (1) is provided with a connecting thread (1-6) at the end away from the coaxial pin (2). The connecting thread (1-6) is located on the hole wall of the channel opening B (1-2) or on the outer wall of the mounting connector (1).
8. The nitrogen blowing needle according to claim 1, characterized in that, The outer circular surface of the mounting joint (1) is also fitted with multiple sealing rings (1-5), which are located on both sides of the channel opening C (1-3); the outer circular surface of the mounting joint (1) is provided with an annular groove (1-4), and the outer end of the channel opening C (1-3) is located in the annular groove (1-4).
9. The nitrogen blowing needle according to claim 1, characterized in that, The outer wall of the mounting joint (1) is divided into three sections, with the annular groove (1-4) located in the middle section of the mounting joint (1); the diameter of the outer wall of the mounting joint (1) gradually decreases, and the large diameter end of the mounting joint (1) is also provided with anti-slip texture (1-7).
10. A nitrogen blowing mechanism, characterized in that, Includes the nitrogen blow-off needle as described in any one of claims 1 to 9.