Capillary tube fixing device of atomic absorption spectrophotometer

Abstract

A capillary tube fixing device of an atomic absorption spectrophotometer is arranged on a protective tube of an atomizer and comprises a hose matched with the inner wall of the protective tube and a hose clamping mechanism, one end of the hose is inserted into the protective tube, and the other end of the hose is connected with a capillary tube in a sleeved mode; the hose clamping mechanism comprises a reducing sleeve, a hose supporting piece and a jacking piece, the reducing sleeve comprises a large-diameter pipe section and a small-diameter pipe section which are integrally formed, the hose is sleeved with the small-diameter pipe section, and the protective pipe is sleeved with the large-diameter pipe section which is in threaded connection with the large-diameter pipe section; the hose supporting piece is arranged in the hose; and the jacking piece penetrates through the small-diameter pipe section and is jacked to the outer wall of the hose. The capillary tube and the protection tube are connected through the hose, a gap between the capillary tube and the protection tube is reduced, the hose supporting piece playing a supporting role is arranged in the hose, the variable-diameter sleeve can be arranged on the outer side of the protection tube and the outer side of the hose in a sleeved mode in a matched mode, and the hose is tightly jacked and fixed to the protection tube through the jacking piece. The phenomenon that the capillary tube is separated from the atomizer is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of spectrophotometers, in particular to a capillary fixing device for an atomic absorption spectrophotometer. Background Art

[0002] A spectrophotometer is an atomic absorption spectrometer, which is mainly used for element analysis and detection. Atomic absorption spectrometer includes a nebulizer, which is a key component in atomic absorption spectrometer and is used to convert samples into a gaseous form suitable for analysis.

[0003] The nebulizer is connected to the sample through a capillary tube, and the nebulizer can suck in the sample and atomize it. However, the capillary tube in the prior art passes through the protective tube at the feed end of the nebulizer and is connected to the spray needle of the nebulizer. The capillary tube is directly inserted into the protective tube for connection. The inner diameter of the protective tube is larger than the outer diameter of the capillary tube. During the operation of the nebulizer or the operation of the staff, the capillary tube is easy to fall off from the protective tube, resulting in the sample not being able to enter the nebulizer normally, causing a large deviation in the analysis data of the atomic absorption spectrometer. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a capillary fixing device for an atomic absorption spectrophotometer.

[0005] The technical solution of this utility model is as follows:

[0006] A capillary fixing device for an atomic absorption spectrophotometer is arranged on a protective tube of an atomizer, and comprises a hose matched with the inner wall of the protective tube and a hose clamping mechanism, one end of the hose is inserted in the protective tube, and the other end is sleeved with the capillary;

[0007] The hose clamping mechanism includes a reducing sleeve, a hose support and a tightening member, one end of the reducing sleeve is sleeved on the outside of the hose, and the other end is sleeved on the outside of the protective tube and is detachably connected thereto;

[0008] The hose support is arranged in the hose, and its interior is a hollow structure, which is communicated with the hose, and one end of which extends into the small diameter pipe section and can support the inner wall of the hose;

[0009] The pressing piece passes through the reducing sleeve and is pressed against the outer wall of the hose.

[0010] The capillary tube has a small diameter and is not convenient for being directly connected to the protective tube of the atomizer. Therefore, the capillary tube and the protective tube are connected by a hose to reduce the gap between the capillary tube and the protective tube, and a hose support is provided in the hose to play a supporting role. The hose support can cooperate with the reducing sleeve mounted on the outside of the protective tube and the hose, and the hose can be tightened and fixed on the protective tube by the tightening piece to avoid the capillary tube from detaching from the atomizer.

[0011] The reducing sleeve comprises an integrally formed large-diameter pipe section and a small-diameter pipe section. The large-diameter pipe section is sleeved on the outside of the protective pipe and threadedly connected thereto, and the small-diameter pipe section is sleeved on the outside of the hose, and the tightening piece is threadedly connected to the small-diameter pipe section.

[0012] The specific structure of the above-mentioned tightening member is that the tightening member includes a fastening bolt that passes through the small diameter pipe section and is threadedly connected thereto, and its axis is perpendicular to the axis of the small diameter pipe section. The tightening member is configured as a fastening bolt for easy operation and quick tightening.

[0013] In order to increase the contact area between the fastening bolt and the hose, one end of the fastening bolt located in the small diameter pipe section is rotatably connected with a clamping plate, and a surface of the clamping plate close to the hose is matched with the outer surface of the hose.

[0014] Regarding the structure of the hose support, the hose support is an elastic plastic tube or spring. Compared with the plastic tube, the spring has better elasticity and reset ability, which is conducive to the normal transportation of the sample.

[0015] The specific structure of the above-mentioned spring is that the pitch of the spring increases from one end located on the outside of the protective tube to the other end. The pitch of the spring located on the outside of the protective tube is smaller, which is convenient for cooperating with the tightening piece to clamp the hose, thereby avoiding the tightening piece from tightening on the hose between adjacent spring coils of the spring, causing the hose to lack support and affecting the clamping effect.

[0016] Regarding the specific structure of the clamping plate, the length of the clamping plate along the axial direction of the small-diameter pipe section is greater than the sum of the two pitches of the springs adjacent thereto.

[0017] In order to reduce the phenomenon that the section of the spring located outside the protective tube is excessively bent and cannot be reset normally, the length of the section of the spring located outside the protective tube is set to 1 / 3-2 / 3 of the total length of the spring.

[0018] In order to ensure that the pipe section of the spring located outside the protective tube can be located directly below the clamping plate and improve the clamping effect on the hose, the length of the pipe section of the spring located outside the protective tube is consistent with the length of the small diameter pipe section and is greater than the length of the clamping plate along the axis of the small diameter pipe section.

[0019] The beneficial effects of the utility model are:

[0020] Connecting a thinner capillary tube to the protective tube of the atomizer through a hose can reduce the gap when the capillary tube is directly connected to the protective tube, which is conducive to a firm connection between the capillary tube and the atomizer;

[0021] By arranging a hose support at one end of the protective tube where the hose is inserted into the nebulizer, the hose support has a supporting effect on the end of the hose, which can reduce the deformation or bending of the hose when it is inserted into the protective tube, and avoid the phenomenon that the bending of the hose affects the sample from entering the nebulizer;

[0022] The length of the hose support can extend from the end of the hose inserted into the atomizer to a certain length outside the protective tube. The hose support has a certain hardness and elasticity, and can prevent the hose from bending at the junction of the hose and the outer end surface of the protective tube, thereby preventing the hose from twisting or bending at the outer end surface of the protective tube.

[0023] The reducing sleeve is put on the outside of the hose and the protective tube in advance, the large diameter pipe section of the reducing sleeve is threadedly connected to the protective tube, and passes through the small diameter pipe section through the tightening piece, and the hose is clamped between the hose support and the tightening piece. The tightening piece tightens and fixes the hose to the protective tube, and the large diameter pipe section detachably connects the small diameter pipe section to the protective tube, which is easy to disassemble. At the same time, it can avoid the phenomenon of the capillary tube detaching from the atomizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached picture:

[0025] Figure 1 It is a structural schematic diagram;

[0026] Figure 2 It is a top view;

[0027] Figure 3 for Figure 2 A schematic diagram of a partial cross-sectional structure viewed along the AA line;

[0028] Figure 4 for Figure 1 The enlarged structural diagram at A in the middle;

[0029] Figure 5 It is a schematic diagram of the spring structure;

[0030] The components represented by the reference numerals in the figure are:

[0031] 1. Atomizer; 11. Protective tube; 2. Hose; 3. Fastener; 4. Reducer sleeve; 41. Large diameter pipe section; 42. Small diameter pipe section; 5. Hose support; 6. Pressing plate. DETAILED DESCRIPTION

[0032] See also Figure 1 and Figure 2 The capillary fixing device of the atomic absorption spectrophotometer shown is arranged on the protective tube 11 of the nebulizer 1, and includes a hose 2 matched with the inner wall of the protective tube 11 and a clamping mechanism of the hose 2. One end of the hose 2 is inserted into the protective tube 11, and the other end is fixed to the capillary sleeve. The fixing method can be bonding or other methods.

[0033] Among them, see Figure 2 and Figure 3As shown, the clamping mechanism of the hose 2 includes a reducing sleeve 4, a hose support 5 and a tightening member 3. The reducing sleeve 4 includes an integrally formed large-diameter pipe section 41 and a small-diameter pipe section 42. The small-diameter pipe section 42 is sleeved on the outside of the hose 2. The outer circumferential surface of the protective tube 11 is provided with an external thread, and the inner circumferential surface of the large-diameter pipe section 41 is provided with an internal thread matching the external thread. The large-diameter pipe section 41 is sleeved on the outside of the protective tube 11 and is threadedly connected thereto. The tightening member 3 passes through the small-diameter pipe section 42 and is tightened to the outer wall of the hose 2.

[0034] See also Figure 3 and Figure 4 As shown, the hose support 5 is arranged in the hose 2 and can support the inner wall of the hose 2. The hose support 5 is an elastic plastic tube or a spring. The spring has better elasticity and reset ability than the plastic tube, which is conducive to the normal transportation of the sample. Therefore, the present embodiment selects a spring as the hose support 5 of the hose 2. The pitch of the spring increases from one end located outside the protective tube 11 to the other end. The structure of the spring is as shown in FIG. Figure 5 The spring outside the protective tube 11 has a smaller pitch, which is convenient for cooperating with the tensioning member 3 to clamp the hose 2, so as to prevent the tensioning member 3 from pressing on the hose 2 between adjacent spring coils, which makes the hose 2 lack support and affects the clamping effect.

[0035] In order to reduce the phenomenon that the pipe section of the spring located outside the protection tube 11 is excessively bent and cannot be reset normally, the length of the pipe section of the spring located outside the protection tube 11 is set to 1 / 3-2 / 3 of the full length of the spring. In order to improve the pipe section of the spring located outside the protection tube 11 to be located directly below the clamping plate 6 and improve the clamping effect on the hose 2, the length of the pipe section of the spring located outside the protection tube 11 is consistent with the length of the small diameter pipe section 42 and is greater than the length of the clamping plate 6 along the axis of the small diameter pipe section 42.

[0036] The spectrophotometer mentioned in the utility model can be the AA-7020 spectrophotometer of Beijing Dongxi Analysis. Based on this improvement, the above-mentioned structure of the utility model plays the role that the diameter of the capillary is small, and it is not convenient to directly connect with the protective tube 11 of the nebulizer 1. For this reason, the capillary and the protective tube 11 are connected by a hose 2 to reduce the gap between the capillary and the protective tube 11, and a hose support 5 playing a supporting role is provided in the hose 2, which can cooperate with the reducing sleeve 4 sleeved on the outside of the protective tube 11 and the hose 2, and the hose 2 is tightened and fixed on the protective tube 11 by the tightening member 3 to avoid the capillary from detaching from the nebulizer 1.

[0037] See also Figure 4As shown, the specific structure of the top fastener 3 is that the top fastener 3 includes a fastening bolt and an adjusting cap. The fastening bolt passes through the small diameter pipe section 42 and is threadedly connected thereto. The adjusting cap is arranged at the end of the fastening bolt away from the hose 2, which is convenient for screwing the fastening bolt. The axis of the fastening bolt is perpendicular to the axis of the small diameter pipe section 42. The top fastener 3 is set as a fastening bolt, which is convenient for operation and quick tightening. In order to increase the contact area between the fastening bolt and the hose 2, one end of the fastening bolt located in the small diameter pipe section 42 is rotatably connected with a clamping plate 6. The side of the clamping plate 6 close to the hose 2 is adapted to the outer surface of the hose 2, so that when the fastening bolt rotates, the clamping plate 6 will not be driven to rotate. Regarding the specific structure of the clamping plate 6, the length of the clamping plate 6 along the axis direction of the small diameter pipe section 42 is greater than the sum of the two pitches of the spring close thereto, so that the clamping plate 6 can cooperate with at least two coils of springs in the hose 2 to clamp the hose 2 and prevent the hose 2 from falling off.

Claims

1. A capillary fixing device for an atomic absorption spectrophotometer, arranged on a protective tube (11) of an atomizer (1), characterized in that: It comprises a hose (2) matched with the inner wall of a protective tube (11) and a hose (2) clamping mechanism, wherein one end of the hose (2) is inserted into the protective tube (11) and the other end is sleeved with a capillary tube; The hose (2) clamping mechanism comprises a reducing sleeve (4), a hose support (5) and a tightening member (3). One end of the reducing sleeve (4) is sleeved on the outside of the hose (2), and the other end is sleeved on the outside of the protective tube (11) and is detachably connected thereto; The hose support (5) is arranged inside the hose (2) and is in communication with the hose (2), one end of which extends to the outside of the protective tube (11) and is capable of supporting the inner wall of the hose (2); The pressing member (3) passes through the reducing sleeve (4) and is pressed against the outer wall of the hose (2).

2. The capillary fixing device for an atomic absorption spectrophotometer according to claim 1, characterized in that: The reducing sleeve (4) comprises an integrally formed large-diameter pipe section (41) and a small-diameter pipe section (42); the large-diameter pipe section (41) is sleeved on the outside of the protective pipe (11), the small-diameter pipe section (42) is sleeved on the outside of the hose (2), and the tightening member (3) is threadedly connected to the small-diameter pipe section (42).

3. The capillary fixing device for an atomic absorption spectrophotometer according to claim 2, characterized in that: The tightening member (3) comprises a tightening bolt which passes through the small diameter pipe section (42) and is threadedly connected thereto, and the axis of the tightening bolt is perpendicular to the axis of the small diameter pipe section (42).

4. The capillary fixing device for an atomic absorption spectrophotometer according to claim 3, characterized in that: One end of the fastening bolt located in the small diameter pipe section (42) is rotatably connected to a clamping plate (6), and a surface of the clamping plate (6) close to the hose (2) is matched with the outer surface of the hose (2).

5. The capillary fixing device for an atomic absorption spectrophotometer according to claim 4, characterized in that: The hose support (5) is an elastic plastic tube or a spring.

6. The capillary fixing device for an atomic absorption spectrophotometer according to claim 5, characterized in that: The pitch of the spring increases gradually from one end located outside the protection tube (11) to the other end.

7. The capillary fixing device for an atomic absorption spectrophotometer according to claim 6, characterized in that: The length of the clamping plate (6) along the axial direction of the small-diameter pipe section (42) is greater than the sum of two pitches of a spring adjacent thereto.

8. The capillary fixing device for an atomic absorption spectrophotometer according to claim 7, characterized in that: The length of the pipe section of the spring located outside the protection pipe (11) is 1 / 3-2 / 3 of the entire length of the spring.

9. The capillary fixing device for an atomic absorption spectrophotometer according to claim 8, characterized in that: The length of the pipe section of the spring located outside the protection pipe (11) is consistent with the length of the small diameter pipe section (42), and is greater than the length of the pressing plate (6) along the axial direction of the small diameter pipe section (42).

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