Height adjusting mechanism for gas needle of nitrogen blowing concentrator

Abstract

The utility model relates to a height adjusting mechanism for a gas needle of a nitrogen blowing instrument, which comprises a support, a mounting hole is arranged on the support, an adjusting sleeve is connected in the mounting hole, a needle valve tube is arranged in the adjusting sleeve in a sliding and penetrating manner, and the bottom of the needle valve tube is connected with a needle head; the bottom of the adjusting sleeve protrudes out of the bottom of the support, a first notch is formed in the bottom of the adjusting sleeve in the axis direction of the adjusting sleeve and penetrates through the bottom of the adjusting sleeve, a second notch is formed in the adjusting sleeve in the circumferential direction of the adjusting sleeve, and the second notch is communicated with the first notch; the adjusting sleeve is provided with a first notch, the adjusting sleeve is located on the two sides of the first notch to form a fixed end and a movable end respectively, a through hole is formed in the movable end, a threaded hole is formed in the fixed end, and the through hole and the threaded hole are connected through a bolt. The height of the needle valve tube can be adjusted without rotation.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen blowing instruments, in particular to a gas needle height adjustment mechanism for a nitrogen blowing instrument. Background Art

[0002] The principle of the nitrogen blowdown instrument is mainly to use the inactive nature of nitrogen to break the gas-liquid equilibrium above the liquid and accelerate the volatilization rate of the liquid by blowing it quickly, continuously and controllably onto the heated sample surface.

[0003] The nitrogen blowdown instrument is provided with multiple gas needles, and the upper and lower heights of the gas needles are adjustable, so that the gas needles can be inserted into the corresponding sample container when in use. For example, the Chinese utility model patent with the announcement number CN214844384U discloses a nitrogen blowdown instrument bracket, which is provided with adjustment grooves on the needle valve tube, and the hole wall of the adjusting bolt adjusting inner hole is provided with avoidance grooves that allow the adjustment grooves to pass through and transverse grooves that match the adjustment grooves. The height of the needle valve tube is adjusted and fixed by rotating the needle valve tube to adjust the relative position of the adjustment grooves in the adjusting inner hole. However, in this technical solution, the height adjustment process of the needle valve tube requires a rotating action, and rotating the needle valve tube will cause the nitrogen gas pipeline to be twisted, which is easy to cause damage to the gas pipeline. Summary of the invention

[0004] In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide a nitrogen blowdown instrument gas needle height adjustment mechanism, which can achieve height adjustment of the needle valve tube without rotating it.

[0005] In order to solve the above technical problems, the utility model provides a nitrogen blowing instrument gas needle height adjustment mechanism, including a bracket, a mounting hole is provided on the bracket, an adjustment sleeve is connected in the mounting hole, a needle valve tube is slidably inserted in the adjustment sleeve, and a needle head is connected to the bottom of the needle valve tube; the bottom of the adjustment sleeve protrudes from the bottom of the bracket, a first notch is provided at the bottom of the adjustment sleeve along its axial direction, the first notch passes through the bottom of the adjustment sleeve, a second notch is provided on the adjustment sleeve along its circumferential direction, and the second notch is connected to the first notch; the adjustment sleeve is located on both sides of the first notch to form fixed

[0006] A fixed end and a movable end, the movable end is provided with a through hole, the fixed end is provided with a threaded hole, and the through hole and the threaded hole are connected by bolts.

[0007] Preferably, a circle of bosses is protrudingly provided on the outer periphery of the adjustment sleeve, and the bosses are overlapped on the top of the bracket.

[0008] Preferably, the boss separates the adjustment sleeve into a supporting section and a connecting section, the upper portion of the connecting section is provided with an external thread threadedly connected to the mounting hole, and the lower portion of the connecting section is provided with the first notch and the second notch.

[0009] Preferably, a fixing ring is protrudingly provided on the upper part of the outer circumference of the needle valve tube, and a spring is compressed and abutted between the fixing ring and the boss.

[0010] Preferably, the bolt is a handle bolt.

[0011] Preferably, the outer diameter of the fixing ring is larger than the inner diameter of the adjusting sleeve.

[0012] Preferably, the length of the second notch is two-thirds of the circumference of the adjustment sleeve.

[0013] Preferably, the inner wall of the movable end is provided with friction convex patterns.

[0014] The utility model has the following beneficial effects: when the height of the needle valve tube needs to be adjusted, the utility model only needs to loosen the bolts so that the movable end and the fixed end are separated from each other, so that the needle valve tube can slide relative to the adjustment sleeve. After the height of the needle valve tube is adjusted to the right position, the bolts are tightened so that the movable end and the fixed end are close to each other. At this time, the inner circumference of the space enclosed between the movable end and the fixed end is gradually reduced, so that the needle valve tube is gradually clamped, so that the position of the needle valve tube relative to the adjustment sleeve is fixed. It can be seen that in the utility model, during the height adjustment process of the needle valve tube, there is no need to rotate the needle valve tube, and only the bolts need to be tightened or loosened to achieve the clamping or release of the needle valve tube, which makes the adjustment more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0016] Figure 1 A structural steel schematic diagram of a nitrogen blowing instrument gas needle height adjustment mechanism according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the adjustment sleeve implemented in the utility model.

[0018] Reference numerals:

[0019] 1- bracket; 2- adjusting sleeve; 21- boss; 22- supporting section; 23- connecting section; 231- through hole; 232- threaded hole; 24- first notch; 25- second notch; 3- needle valve tube; 31- fixing ring; 4- needle; 5- spring. DETAILED DESCRIPTION

[0020] Here, it should be noted that the functions and methods involved in the present invention are merely conventional adaptive applications of the prior art. Therefore, the improvement of the present invention on the prior art is essentially the connection relationship between the hardware, rather than the functions and methods themselves. That is, although the present invention involves some functions and methods, it does not include improvements to the functions and methods themselves. The description of the functions and methods in the present invention is to better illustrate the present invention so as to better understand the present invention.

[0021] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0022] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0023] like Figure 1 and Figure 2 As shown, this embodiment provides a nitrogen blowdown instrument gas needle height adjustment mechanism, including a bracket 1, a mounting hole is provided on the bracket 1, an adjustment sleeve 2 is connected in the mounting hole, a needle valve tube 3 is slidably penetrated in the adjustment sleeve 2, and a needle 4 is connected to the bottom of the needle valve tube 3. In this embodiment, the needle valve tube 4 is used to connect to a nitrogen gas source.

[0024] The outer periphery of the adjusting sleeve 2 is protrudingly provided with a circle of bosses 21, which are overlapped on the top of the bracket 1, and the bosses 21 separate the adjusting sleeve into a supporting section 22 and a connecting section 23, wherein the upper part of the connecting section 23 is provided with an external thread threadedly connected to the mounting hole of the bracket 1, and the lower part of the connecting section 23 is provided with a clamping structure capable of clamping the needle valve tube 3, and the bottom of the connecting section 23 protrudes from the bottom of the bracket 1.

[0025] Specifically, the clamping structure includes a first notch 24 provided at the bottom of the adjusting sleeve 2 along the axial direction thereof, the first notch 24 penetrates the bottom of the adjusting sleeve 2, and a second notch 25 is provided on the adjusting sleeve 2 along the circumference thereof, the second notch 25 communicates with the first notch 24. The adjusting sleeve 2 is located on both sides of the first notch 24 to form a fixed end and a movable end, respectively, a through hole 231 is provided on the movable end, and a threaded hole 232 is provided on the fixed end, the through hole 231 and the threaded hole 232 are connected by a bolt (not shown in the figure), and the bolt is specifically a handle bolt, so as to facilitate loosening or tightening.

[0026] Specifically, the length of the second notch 25 is two-thirds of the circumference of the adjusting sleeve 2 , so that the movable end can be smoothly deformed during the tightening or loosening process of the bolt to clamp or release the needle valve tube 3 .

[0027] In this embodiment, when it is necessary to adjust the height of the needle valve tube 3, it is only necessary to loosen the bolt so that the movable end and the fixed end are away from each other, so that the needle valve tube 3 can slide relative to the adjustment sleeve 2. After the height of the needle valve tube 3 is adjusted to the right position, the bolt is tightened so that the movable end and the fixed end are close to each other. At this time, the inner circumference size of the space enclosed between the movable end and the fixed end gradually decreases, so that the needle valve tube 3 is gradually clamped, so that the position of the needle valve tube 3 relative to the adjustment sleeve 2 is fixed.

[0028] Furthermore, in order to ensure that the needle valve tube 3 is clamped, friction convex patterns are provided on the inner wall of the movable end in this embodiment to increase the friction between the two.

[0029] Furthermore, a fixing ring 31 is protrudingly provided on the upper part of the outer periphery of the needle valve tube 3, and a spring 5 is compressed and abutted between the fixing ring 31 and the boss 21, and the outer diameter of the fixing ring 31 is larger than the inner diameter of the adjusting sleeve 2. When the bolt is loosened and the height of the needle valve tube 3 is adjusted downward, the spring 5 is compressed and stored, and applies an upward force to the needle valve tube 3 to ensure that the needle valve tube 3 will not fall downward rapidly accidentally, so as to improve the safety of the sample container. In addition, the design of the spring 5 can also play an auxiliary role when adjusting the height of the needle valve tube 3 upward, which is more labor-saving and convenient.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A nitrogen blowdown instrument gas needle height adjustment mechanism, characterized in that: include: A bracket, wherein a mounting hole is provided on the bracket, an adjusting sleeve is connected in the mounting hole, a needle valve tube is slidably inserted in the adjusting sleeve, and a needle is connected to the bottom of the needle valve tube; The bottom of the adjusting sleeve protrudes from the bottom of the bracket, a first notch is arranged at the bottom of the adjusting sleeve along the axial direction thereof, the first notch passes through the bottom of the adjusting sleeve, and a second notch is arranged on the adjusting sleeve along the circumference thereof, the second notch is communicated with the first notch; The adjusting sleeve is located at two sides of the first notch to form a fixed end and a movable end respectively, the movable end is provided with a through hole, the fixed end is provided with a threaded hole, and the through hole and the threaded hole are connected by bolts.

2. A nitrogen blowing instrument gas needle height adjustment mechanism according to claim 1, characterized in that: A circle of bosses is protrudingly provided on the outer periphery of the adjusting sleeve, and the bosses are overlapped on the top of the bracket.

3. A nitrogen blowing instrument gas needle height adjustment mechanism according to claim 2, characterized in that: The boss divides the adjusting sleeve into a supporting section and a connecting section. The upper portion of the connecting section is provided with an external thread threadedly connected to the mounting hole. The lower portion of the connecting section is provided with the first notch and the second notch.

4. A nitrogen blowing instrument gas needle height adjustment mechanism according to claim 2, characterized in that: A fixing ring is protrudingly provided on the upper part of the outer circumference of the needle valve tube, and a spring is compressed and abutted between the fixing ring and the boss.

5. The nitrogen blowing instrument gas needle height adjustment mechanism according to claim 1, characterized in that: The bolt is a handle bolt.

6. A nitrogen blowing instrument gas needle height adjustment mechanism according to claim 4, characterized in that: The outer diameter of the fixing ring is greater than the inner diameter of the adjusting sleeve.

7. The nitrogen blowing instrument gas needle height adjustment mechanism according to claim 1, characterized in that: The length of the second notch is two-thirds of the circumference of the adjustment sleeve.

8. The nitrogen blowing instrument gas needle height adjustment mechanism according to claim 1, characterized in that: The inner wall of the movable end is provided with friction convex patterns.

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