Quartz capillary tube sealing device

Abstract

The utility model discloses a quartz capillary tube sealing device, and relates to the technical field of analysis instrument sealing. The device comprises an ethylene propylene diene monomer sealing block, a compression mechanism sleeved outside the ethylene propylene diene monomer sealing block and a needle guide piece. And the compression mechanism consists of a sealing seat, a nylon clamping jaw sleeved outside the sealing block and a sleeve in threaded connection with the sealing seat. The device is specially designed for a vacuumizing process; a channel is pre-formed through the needle guide piece, so that nondestructive insertion and extraction of the capillary tube are realized; the nylon clamping jaw is pressed by screwing the sleeve, so that the sealing block is radially deformed to realize vacuum sealing; the device can be flexibly placed as an independent tool. The utility model has the core effects that the problems that the capillary tube is easily damaged, the operation is complicated and the sealing is unreliable in the traditional temporary sealing method are solved, and a special tool which can quickly finish sealing and unsealing in the vacuum preparation stage, is simple and convenient to operate and can effectively protect the capillary tube is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fluid connection technology of analytical instrument or experimental equipment, and particularly relates to a quartz capillary sealing device. BACKGROUND

[0002] Before introducing the sample into a high-vacuum analytical instrument (such as a mass spectrometer) for analysis, the sample introduction system must first be evacuated to achieve the required working pressure. During this process, if one end of the quartz capillary of the connection system is in an open state, it will cause atmospheric air to directly enter the system, making it impossible to effectively establish a vacuum. Therefore, temporary and reliable sealing of this end of the capillary is required.

[0003] Currently, the common temporary sealing method is to manually wrap and seal using a sealing film. This method is not only cumbersome to operate and difficult to ensure sealing effectiveness, but can also cause micro-leakage and prolong the vacuuming time. More seriously, the sealing film can easily generate uneven stress on the brittle quartz capillary during wrapping, causing it to break. In addition, when the vacuum is up to standard and the sample needs to be introduced, the process of removing the sealing film also has the risk of damaging the capillary, and is inconvenient to operate.

[0004] Therefore, this method cannot meet the requirements of "temporary sealing, quick opening and closing", and flexible arrangement. Therefore, there is an urgent need for a temporary sealing device that is specifically used for the vacuuming process, is easy to operate, is reliable in sealing, and can maximize the protection of the capillary. SUMMARY

[0005] The technical problem to be solved by the utility model is that, in the prior art, the temporary sealing method for the end of the quartz capillary during the vacuuming stage of the analytical instrument is cumbersome to operate, has poor reliability, is prone to damage the capillary, and lacks a special tool. The utility model provides a temporary sealing device that is simple in structure, flexible to use, and can achieve quick and reliable sealing and unsealing.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The quartz capillary sealing device comprises:

[0008] The sealing block is made of an elastic material;

[0009] The compression mechanism is sleeved on the outside of the sealing block and is used to compress the sealing block to cause radial deformation thereof.

[0010] As an optional implementation, the material of the sealing block is ethylene propylene diene rubber.

[0011] As an optional implementation, the compression mechanism comprises:

[0012] The sealing seat;

[0013] Nylon clamping jaw, coaxially sleeved on the outside of the sealing block and placed in the cavity of the sealing seat together with the sealing block;

[0014] Sleeve, provided with internal threads matched with external threads on the sealing seat and mounting holes for the quartz capillary to pass through;

[0015] Wherein, the sleeve and / or the sealing seat are rotated to drive the sleeve and the sealing seat to approach each other, compress the nylon clamping jaw to make the sealing block radially deform.

[0016] As an optional implementation, the nylon clamping jaw comprises a splicing section and a clamping jaw section;

[0017] The internal diameters of the splicing section and the clamping jaw section are consistent, but the external diameter of the clamping jaw section is larger;

[0018] The splicing section is spliced in the cavity of the sealing seat;

[0019] The clamping jaw section is exposed outside the cavity and has an external diameter larger than the internal diameter of the sleeve.

[0020] As an optional implementation, it further comprises a needle guide inserted into the sealing block to form a preformed channel.

[0021] As an optional implementation, the sealing block is provided with a guide hole for the needle guide to be inserted into.

[0022] As an optional implementation, the external surface of the sleeve is provided with anti-skid lines.

[0023] The utility model is specially designed for the temporary sealing requirement in the vacuum stage of an analytical instrument, and through the design of the needle guide preformed channel, it ensures that the brittle quartz capillary can be effectively prevented from being damaged in the process of insertion and extraction, which is very important for the temporary sealing scene requiring frequent insertion and extraction.

[0024] Secondly, the device realizes manual quick locking and loosening through the cooperation of the nylon clamping jaw and the threaded sleeve, the operation is extremely simple, and the working efficiency can be significantly improved; in the locked state, it can provide reliable sealing sufficient to maintain the system vacuum degree, and when loosened, it can quickly release the restraint on the capillary.

[0025] Furthermore, the device is an independent tool module, and its placement position has high flexibility, can be placed nearby according to the operation habit and the shortest distance principle, and greatly optimizes the operation dynamic line.

[0026] Finally, its structure is strong and durable, can withstand repeated use, EPDM sealing block and nylon jaw have good durability, together constitute a special for vacuum preparation process design, set protection, convenience, reliability and flexibility in one ideal temporary sealing solution. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a state diagram after the capillary tube needle guide is inserted into the sealing device of the utility model;

[0028] Figure 2 is Figure 1 the internal state diagram;

[0029] Figure 3 is Figure 1 the explosion diagram;

[0030] In the figure: 1, sealing block; 2, sealing seat; 201, cavity; 3, nylon jaw; 4, sleeve; 401, anti-skid pattern; 402, mounting hole; 5, needle guide; 6, quartz capillary tube. DETAILED DESCRIPTION

[0031] The specific embodiments of the utility model will be described in detail below in conjunction with the drawings of the specification.

[0032] Please refer to Figures 1 to 3 It can be seen that the sealing device provided by the utility model mainly consists of three core parts of sealing block 1, compression mechanism and needle guide 5.

[0033] Among them, the sealing block 1 is made of elastic material, preferably EPDM, which has excellent elastic recovery performance and chemical stability, and its shape can be a cylindrical structure. In order to facilitate the smooth insertion of the needle guide 5, a guide hole can be optionally provided in the inside of the sealing block 1 along the axial direction. Of course, the diameter of the guide hole can have various specifications, but the prerequisite is to be smaller than the outer diameter of the quartz capillary tube 6. Experimenters can replace the sealing block 1 with different sizes of guide holes to meet the sealing needs of quartz capillary tubes 6 with different outer diameters.

[0034] The compression mechanism, as a key component to realize the sealing function, specifically consists of a sealing seat 2, a nylon jaw 3 and a sleeve 4.

[0035] As Figure 3The sealing seat 2 may include a platform and a cylindrical structure with external threads extending upward from the platform. The cylindrical structure contains a cavity 201 for accommodating the nylon gripper 3 and the sealing block 1. In practical use, the sealing seat 2 can be made of magnetic material or have several threaded holes drilled on the edge of the platform to facilitate fixing the sealing seat 2 near experimental platforms such as sample inlets. This ensures that during the sealing process, the entire sealing device will not fall off due to accidents, preventing the quartz capillary 6 from breaking or being damaged.

[0036] The nylon gripper 3 is coaxially sleeved on the outside of the sealing block 1. Its structure can be specially designed, comprising two parts: a plug section and a gripper section. The outer diameter of the plug section matches the inner diameter of the cavity 201 of the sealing seat 2, and is fixedly installed at the end of the cavity 201 by an interference fit. The outer diameter of the gripper section is significantly larger than that of the plug section, and, for example... Figure 3 or Figure 2 As shown, in order to enhance the deformation capability of the gripper segment and reduce the resistance encountered by the rotating sealing seat 2 or sleeve 4 later, we can open a circumferential array of through grooves at the end of the gripper segment, and the part of the gripper segment that contacts and presses against the sleeve 4 is designed to be arc-shaped. In this way, the "claw"-shaped gripper segment will shrink towards the middle under the continuous compression of the sleeve 4, thereby clamping the middle sealing block 1 and applying pressure to achieve the purpose of sealing the quartz capillary 6.

[0037] The sleeve 4 serves as an external operating component. It has an internal thread that mates with the external thread of the sealing seat 2, and a mounting hole 402 at its top for the quartz capillary tube 6 to pass through. The outer surface of the sleeve 4 can also be machined with anti-slip textures 401. These anti-slip textures 401 can be different patterns such as straight lines, grids, or waves. Their main function is to increase the friction during manual operation, making rotation easier.

[0038] The needle guide 5 can be made of stainless steel and has an overall tubular structure. Its inner diameter matches the diameter of the quartz capillary tube 6. Utilizing its good structural strength, it is first inserted into the guide hole, which is then enlarged to form a pre-fabricated channel. This allows the sealing end of the quartz capillary tube 6 to enter the sealing block 1 from inside the needle guide 5. Then, the needle guide 5 is pulled upwards, completing the introduction and sealing of the quartz capillary tube. At this point, due to the obstruction of the sealing device, the needle guide 5 cannot be easily removed from the quartz capillary tube 6 and remains fitted on the quartz capillary tube 6 outside the sealing device. However, this does not affect the sealing effect or the use of the quartz capillary tube 6. It can be removed when the seal is released.

[0039] Thus, when the sleeve 4 and the sealing seat 2 are relatively rotated, the sleeve 4 is close to the sealing seat 2 along the axial direction due to the cooperation of the internal thread of the sleeve 4 and the external thread of the sealing seat 2. The lower end edge of the sleeve 4 first contacts the clamping segment of the nylon clamping jaw 3, and the axial pressure applied by the sleeve 4 on the clamping segment gradually increases along with the continuous rotation. Since the outer diameter of the clamping segment is larger than the inner diameter of the sleeve 4 and the material thereof has a certain flexibility, the clamping segment starts to shrink radially under the pressure. The shrinkage force is further transmitted to the internal sealing block 1, forcing the sealing block 1 to elastically deform, and the internal guide hole diameter of the sealing block 1 is reduced, so as to tightly wrap the quartz capillary tube 6 and form a reliable seal.

[0040] In the actual assembly process, the nylon clamping jaw 3 is first sleeved outside the sealing block 1, and then the combination is placed in the cavity 201 of the sealing seat 2, so that the insertion segment of the nylon clamping jaw 3 is completely inserted in place. Then the needle guide 5 is inserted into the mounting hole 402 of the sleeve 4 and accurately inserted into the guide hole of the sealing block 1 to form a complete preset channel. At this time, the device is in a ready-to-use state, which can be placed in the most convenient position, for example, installed on the table surface near the sample inlet by the magnetic attraction structure or bolt fixing method at the bottom of the sealing seat 2.

[0041] When vacuum preparation is needed, the operator only needs to gently push the quartz capillary tube 6 along the preset channel formed by the needle guide 5, and since the preset channel has provided accurate guidance for the quartz capillary tube 6, the deflection or bending of the quartz capillary tube 6 during insertion is completely avoided. After the quartz capillary tube 6 reaches the predetermined position, the needle guide 5 is slowly pulled out, and at this time the quartz capillary tube 6 has been accurately positioned in the guide hole of the sealing block 1. Then the sleeve 4 is rotated by holding the anti-slip part 401 of the sleeve 4 with the hand, and as the sleeve 4 is tightened, the operator can obviously feel that the resistance gradually increases, which indicates that the sealing block 1 is generating radial pressure on the capillary tube. When the resistance reaches a predetermined value, the rotation is stopped, and at this time the device has realized reliable sealing, and the system can start the vacuum operation.

[0042] After the system vacuum degree reaches the standard, when the sealing needs to be released for sampling, the operation process is simpler. Only the sleeve 4 is reversely rotated, and the resistance can be obviously felt to decrease, which indicates that the compression state of the sealing block 1 has been released. At this time, the quartz capillary tube 6 can be easily pulled out of the device and immediately moved into the sample gas source for sampling analysis. The entire operation process usually only needs 10-15 seconds, which greatly improves the work efficiency.

[0043] In summary, the quartz capillary tube 6 temporary sealing device realizes the three goals of reliability, convenience and safety through the ingenious structure design. The cooperation between various components not only ensures the realization of the function, but also considers the manufacturing convenience, and provides an ideal solution for the pre-treatment operation of the analysis instrument.

Claims

1. A quartz capillary sealing device, characterized by, The utility model relates to a sealing block and a compression mechanism for a needle guide, comprising: a sealing block (1) made of elastic material; a compression mechanism, which is sleeved outside the sealing block (1) and is used for compressing the sealing block (1) to make it radially deform; the compression mechanism comprises: a sealing seat (2); a nylon clamping jaw (3), which is coaxially sleeved outside the sealing block (1) and is placed in a cavity (201) of the sealing seat (2) together with the sealing block (1); a sleeve (4), which is provided with internal threads matched with external threads on the sealing seat (2) and a mounting hole (402) through which a quartz capillary tube (6) passes; wherein, the sleeve (4) and / or the sealing seat (2) are rotated to drive the sleeve (4) and the sealing seat (2) to move close to each other, compress the nylon clamping jaw (3) to shrink and make the sealing block (1) radially deform.

2. The quartz capillary sealing device according to claim 1, characterized by: The material of the sealing block (1) is ethylene propylene diene rubber.

3. The quartz capillary sealing device according to claim 1, wherein The nylon clamping jaw (3) comprises a splicing section and a clamping jaw section; the inner diameters of the splicing section and the clamping jaw section are consistent, but the outer diameter of the clamping jaw section is larger; the splicing section is spliced in the cavity (201) of the sealing seat (2); the clamping jaw section is exposed outside the cavity (201) and has an outer diameter larger than the inner diameter of the sleeve (4).

4. The quartz capillary sealing device according to claim 1, wherein It also comprises a needle guide (5) inserted into the sealing block (1) to form a preset channel.

5. The quartz capillary sealing device according to claim 4, wherein The sealing block (1) is provided with a guide hole through which the needle guide (5) is inserted.

6. The quartz capillary sealing device according to claim 1, wherein The outer surface of the sleeve (4) is provided with anti-skid lines (401).

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