Anti-blocking protection device for liquid inlet pipe of atomic absorption spectrophotometer

Abstract

The utility model relates to the technical field of atomic absorption spectrophotometers, in particular to an anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer. The anti-blocking protection device for the liquid inlet pipe of the atomic absorption spectrophotometer comprises an anti-blocking piece, the anti-blocking piece comprises a pipe body, a pipe cavity is formed in the pipe body, one end of the pipe cavity is a water inlet end, the other end of the pipe cavity is a water outlet end, and the water inlet end is used for being connected with a liquid inlet of the liquid inlet pipe; a first protruding part is arranged on the side face of the water outlet end of the pipe body, and the sum of the thickness of the first protruding part and the outer diameter of the water outlet end of the pipe body is larger than the inner diameter of the liquid inlet pipe. And when the water outlet end of the pipe body is inserted into the liquid inlet pipe. According to the anti-blocking protection device, the probability that the liquid inlet pipe is blocked can be greatly reduced, and the problem of failure of the atomic absorption spectrophotometer caused by blockage of the liquid inlet pipe is avoided, so that the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of atomic absorption spectrophotometers, in particular to an anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer. Background Art

[0002] Atomic absorption spectrophotometer is a precision instrument widely used in the field of chemical analysis. Its core function is to quantitatively analyze the concentration of elements in a sample by measuring the absorption of light of a specific wavelength by atoms. As one of the key components of the atomic absorption spectrophotometer, the liquid inlet tube is responsible for introducing the sample to be tested into the analysis system inside the instrument. However, in practical applications, the liquid inlet tube often faces the risk of blockage. The causes of blockage may include the impurity of the sample, the accumulation of residues inside the pipe, and the aging of the pipe due to long-term use. The blockage problem not only affects the accuracy and efficiency of the experiment, but may also cause instrument failure and increase maintenance costs.

[0003] Therefore, it is necessary to improve the liquid inlet tube of the atomic absorption spectrophotometer to enhance its anti-clogging capability, reduce failures and maintenance costs caused by clogging, and ensure the accuracy and reliability of the experimental results. Utility Model Content

[0004] (I) The problem to be solved by the utility model is that the liquid inlet pipe of the atomic absorption spectrophotometer is often at risk of being blocked, which often causes equipment failure and increases maintenance costs.

[0005] (II) Technical solution

[0006] An anti-blocking protective device for a liquid inlet pipe of an atomic absorption spectrophotometer, comprising an anti-blocking member, the anti-blocking member comprising a tube body, the tube body having a tube cavity, one end of the tube cavity being a water inlet end, and the other end being a water outlet end, the water inlet end being used to be connected to a liquid inlet of the liquid inlet pipe;

[0007] A first protrusion is provided on the side of the water outlet end of the tube body, and the sum of the thickness of the first protrusion and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe;

[0008] When the water outlet end of the tube body is inserted into the liquid inlet pipe, the first protrusion opens the liquid inlet of the liquid inlet pipe and the inner wall of the liquid inlet pipe is attached to the outer surface of the tube body;

[0009] At least one filter element for filtering samples is arranged in the lumen of the tube body.

[0010] According to an embodiment of the utility model, the anti-clogging protection device also includes a hose, one end of which is detachably connected to the water inlet end of the pipe body, and the inner diameter of the hose is smaller than the inner diameter of the liquid inlet pipe.

[0011] According to one embodiment of the utility model, the outer diameter of the water inlet end of the tube body is smaller than the outer diameter of the water outlet end thereof, a second protrusion is provided on the side of the water inlet end of the tube body, and the sum of the thickness of the second protrusion and the outer diameter of the water inlet end of the tube body is greater than the inner diameter of the hose.

[0012] According to one embodiment of the utility model, a limiting protrusion is provided on the side of the tube body close to the water outlet end, and when the water outlet end of the tube body is inserted into the liquid inlet pipe, the first protrusion opens the liquid inlet of the liquid inlet pipe and the inner wall of the liquid inlet pipe fits the part of the tube body located between the limiting protrusion and the water outlet end.

[0013] According to an embodiment of the present invention, the outer diameter of the tube body gradually increases from the water outlet of the tube body to the first protrusion.

[0014] According to an embodiment of the present invention, the outer diameter of the tube body gradually increases from the water inlet of the tube body to the second protrusion.

[0015] According to an embodiment of the utility model, the filter element is filter cotton, and the filter cotton is in a cylindrical shape.

[0016] According to an embodiment of the utility model, a cover body is provided at the water inlet end of the tube body, the cover body is communicated with the tube body, and at least one filter screen is provided inside the cover body.

[0017] According to one embodiment of the utility model, a limiting protrusion is provided on the side of the tube body, and when the water outlet end of the tube body is inserted into the liquid inlet pipe, the first protrusion opens the liquid inlet of the liquid inlet pipe and the inner wall of the liquid inlet pipe fits the part of the tube body located between the limiting protrusion and the water outlet end.

[0018] According to an embodiment of the present invention, the inner diameter of the cover body is at least three times the inner diameter of the tube body.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides an anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer, comprising an anti-blocking component, wherein the anti-blocking component comprises a tube body, wherein a tube cavity is provided in the tube body, wherein one end of the tube cavity is a water inlet end, and the other end is a water outlet end, wherein the water inlet end is used to be connected with a liquid inlet of the liquid inlet pipe; a first protrusion is provided on the side surface of the water outlet end of the tube body, and the sum of the thickness of the first protrusion and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe; when the water outlet end of the tube body is inserted into the inside of the liquid inlet pipe, the first protrusion opens the liquid inlet of the liquid inlet pipe and the inner wall of the liquid inlet pipe is attached to the outer side surface of the tube body; and at least one filter for filtering a sample is provided in the tube cavity of the tube body.

[0021] When the liquid inlet pipe is subjected to anti-blocking treatment, the water outlet end of the tube body in the anti-blocking piece is first inserted into the liquid inlet of the liquid inlet pipe. Since a first protrusion is provided on the side of the water outlet end of the tube body, and the sum of the thickness of the first protrusion and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe, the first protrusion will open the liquid inlet of the liquid inlet pipe and make the liquid inlet pipe tightly fit on the side of the first protrusion and the outer surface of the water outlet end of the tube body, so as to ensure the sealing of the connection between the anti-blocking piece and the liquid inlet pipe, and facilitate the rapid installation and disassembly between the two. Since a filter is provided in the lumen of the tube body, the impurities and residues in the sample passing through the tube body will be intercepted by the filter and cannot enter the liquid inlet pipe, thereby greatly reducing the probability of the liquid inlet pipe being blocked, avoiding the problem of atomic absorption spectrophotometer failure caused by the blockage of the liquid inlet pipe, thereby reducing the maintenance cost, and the experimental results are more accurate and reliable because the impurities and residues are intercepted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A connection diagram of a liquid inlet pipe, a hose and an anti-blocking member provided in the first embodiment of the utility model;

[0024] Figure 2 A cross-sectional view of a liquid inlet pipe, a hose and an anti-blocking member provided in Embodiment 1 of the utility model;

[0025] Figure 3 The utility model embodiment 1 provides Figure 2 A magnified view of part A;

[0026] Figure 4 A structural diagram of an anti-blocking member provided in Embodiment 2 of the present utility model;

[0027] Figure 5 A cross-sectional view of the anti-blocking member provided in the second embodiment of the utility model;

[0028] Figure 6 A connection diagram of a liquid inlet pipe and an anti-blocking member provided in Embodiment 3 of the present utility model;

[0029] Figure 7 A cross-sectional view of a liquid inlet pipe and an anti-blocking member provided in Embodiment 3 of the present utility model;

[0030] Figure 8 The third embodiment of the present invention provides Figure 7 Magnified view of part B.

[0031] Icons: 1. Liquid inlet pipe; 2. Hose; 3. Anti-blocking part; 301. First tube body; 302. First raised portion; 303. Limiting protrusion; 304. Second tube body; 305. Second raised portion; 306. Conical surface; 307. Cover body; 308. Filter box; 4. Filter cotton; 5. Filter screen. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Embodiment 1:

[0034] like Figure 1-Figure 3 As shown, one embodiment of the utility model provides an anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer, comprising an anti-blocking component 3, the anti-blocking component 3 comprising a tube body, the tube body having a tube cavity, one end of the tube cavity being a water inlet end, and the other end being a water outlet end, the water inlet end being used to be connected to the liquid inlet of the liquid inlet pipe 1; a first protrusion 302 is provided on the side of the water outlet end of the tube body, the sum of the thickness of the first protrusion 302 and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe 1; when the water outlet end of the tube body is inserted into the interior of the liquid inlet pipe 1, the first protrusion 302 opens the liquid inlet of the liquid inlet pipe 1 and the inner wall of the liquid inlet pipe 1 is attached to the outer surface of the tube body; at least one filter element for filtering the sample is provided in the tube cavity of the tube body.

[0035] In this embodiment, the liquid inlet pipe 1 is a plastic hose. When the liquid inlet pipe 1 is subjected to anti-blocking treatment, the water outlet end of the tube body in the anti-blocking component 3 is first inserted into the liquid inlet of the liquid inlet pipe 1. Since a first protrusion 302 is provided on the side of the water outlet end of the tube body, and the sum of the thickness of the first protrusion 302 and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe 1, the first protrusion 302 will open the liquid inlet of the liquid inlet pipe 1 and make the liquid inlet pipe 1 tightly fit on the side of the first protrusion 302 and the outer surface of the water outlet end of the tube body, so as to ensure the sealing of the connection between the anti-blocking component 3 and the liquid inlet pipe 1, and facilitate the rapid installation and disassembly between the two. Because a filter is provided in the lumen of the tube body, impurities and residues in the sample passing through the tube body will be intercepted by the filter and cannot enter the liquid inlet tube 1, thereby greatly reducing the probability of the liquid inlet tube 1 being blocked, avoiding the problem of atomic absorption spectrophotometer failure caused by blockage of the liquid inlet tube 1, thereby reducing maintenance costs, and because impurities and residues are intercepted, the experimental results are more accurate and reliable.

[0036] As a preferred embodiment, Figure 1 and Figure 2 As shown, the anti-clogging protection device also includes a hose 2, one end of which is detachably connected to the water inlet end of the tube body, and the inner diameter of the hose 2 is smaller than the inner diameter of the liquid inlet pipe 1. It should be noted that because the hose 2 is smaller in size and its inner diameter is smaller than the liquid inlet pipe 1, it can effectively filter out large particles of impurities and residues in the sample, reducing the risk of these large particles of impurities entering the liquid inlet pipe 1 and causing blockage.

[0037] It should be noted that when some small particulate impurities and residues enter the anti-blocking component 3 through the hose 2, they will be intercepted by the filter element in the anti-blocking component 3. In this way, the sample passes through the dual filtering effect of the hose 2 and the filter element, and the purity of the sample entering the liquid inlet pipe 1 is greatly improved, which also ensures that the liquid inlet pipe 1 will not be blocked.

[0038] In addition, it should be noted that in this solution, due to the small inner diameter of the hose 2, it may still be blocked by some small particles, impurities and residues. Therefore, when this problem occurs, the staff can use scissors or other tools to cut off the blocked part of the hose 2. Generally, the blockage in the hose 2 is basically concentrated at the water inlet of the hose 2, so it is only necessary to cut off the hose 2 near the water inlet.

[0039] In addition, when the filter element is clogged, the anti-blocking element 3 can be removed, and then a new filter cotton 4 can be replaced, and then the anti-blocking element 3 can be reinstalled.

[0040] Preferably, the anti-blocking element 3 comprises a tube body and a filter element, wherein the tube body is as follows: Figure 3 As shown, it includes a first tube body 301 and a second tube body 304, the first tube body 301 and the second tube body 304 are connected, the outer diameter of the first tube body 301 is larger than the outer diameter of the second tube body 304, the first tube body 301 is used to connect with the liquid inlet pipe 1, and the second tube body 304 is used to connect with the hose 2.

[0041] Further, in Figure 3 In the embodiment, the left port of the first tube body 301 is the water outlet end of the tube body, and the right port of the second tube body 304 is the water inlet end of the tube body. The first protrusion 302 is arranged on the side of the water outlet end of the first tube body 301, and the first protrusion 302 is integrally formed with the first tube body 301. The first protrusion 302 is in a circular ring shape. Furthermore, from the water outlet of the first tube body 301 to the first protrusion 302, the outer diameter of the tube body gradually increases, so that a conical surface is formed at the water outlet end of the first tube body 301, and the conical surface is connected to the side of the first protrusion 302. In this way, when the anti-blocking member 3 is inserted into the liquid inlet pipe 1, due to the existence of the conical surface, the anti-blocking member 3 can be more easily inserted into the liquid inlet pipe 1.

[0042] Preferably, a limiting protrusion 303 is provided on the outer side surface of the middle position of the first tube body 301, and the limiting protrusion 303 is annular, and its cross section is an isosceles trapezoid. It should be noted that an elastic rubber ring is sleeved on the portion between the limiting protrusion 303 and the first raised portion 302 on the first tube body 301, and the elastic rubber ring is slightly smaller than the outer diameter of the portion between the limiting protrusion 303 and the first raised portion 302 on the first tube body 301. In this way, when the water outlet end of the first tube body 301 is inserted into the interior of the liquid inlet pipe 1, the inner wall of the water inlet end of the liquid inlet pipe 1 will fit tightly on the side of the portion between the limiting protrusion 303 and the first protrusion 302 on the first tube body 301, and the elastic rubber ring plays the role of tightening the liquid inlet pipe 1, so that the liquid inlet pipe 1 can fit more tightly on the side of the portion between the limiting protrusion 303 and the first protrusion 302 of the first tube body 301, which can further enhance the sealing performance of the connection between the first tube body 301 and the liquid inlet pipe 1. The limiting protrusion 303 is mainly used to block the elastic rubber ring to prevent it from separating from the liquid inlet pipe 1 under the action of external force. That is, Figure 3 As shown, the area formed between the limiting protrusion 303 and the first protrusion 302 is used to limit the elastic rubber ring. The elastic rubber ring is limited in the area and cannot move along the axis of the anti-blocking member 3.

[0043] Preferably, Figure 3 As shown, on the right side of the first tube 301, that is, the portion of the first tube 301 from the limiting protrusion 303 to the connection with the second tube 304, the diameter of the first tube 301 decreases successively, and specifically, the diameter of the first tube 301 in this portion gradually decreases in a step-like manner. It should be noted that the purpose of such a setting is to reduce material loss and thus reduce the injection molding cost of the anti-blocking member 3.

[0044] More specifically, Figure 3 A second protrusion 305 is provided on the side of the water inlet end of the second tube body 304. The second protrusion 305 is in a circular ring shape. The function of the second protrusion 305 is similar to that of the first protrusion 302. It is to open the hose 2 so that the hose 2 can fit tightly on the second protrusion 305 to enhance the sealing performance with the hose 2.

[0045] Preferably, in this embodiment, the outer diameter of the second tube body 304 between its water inlet and the second protrusion 305 gradually increases, so that the second tube body 304 can be inserted into the hose 2 more smoothly.

[0046] Furthermore, the connection between the second tube body 304 and the first tube body 301 is chamfered so that a tapered surface 306 is formed at the connection between the second tube body 304 and the first tube body 301. The area between the tapered surface 306 and the second raised portion 305 is used to limit the elastic rubber ring. An elastic rubber ring is sleeved on the second tube body 304 between the tapered surface 306 and the second raised portion 305. The elastic rubber ring is used to tighten the hose 2 so that the hose 2 can fit more closely to the second tube body 304 between the tapered surface 306 and the second raised portion 305.

[0047] In this embodiment, the inner diameter of the first tube body 301 is larger than the inner diameter of the second tube body 304, and the filter element is filter cotton 4, which is made of sponge material and forms a cylinder on the outside. The filter cotton 4 is inserted into the inner cavity of the first tube body 301 to filter impurities and residues in the sample.

[0048] Embodiment 2:

[0049] like Figure 4 and Figure 5 As shown, this second embodiment provides another anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer, which includes an anti-blocking member 3, which is different from the anti-blocking member 3 in the first embodiment in structure. Specifically, the anti-blocking member 3 in this embodiment includes a first tube body 301, a filter box 308, and a second tube body 304 that are sequentially connected. The filter box 308 is disc-shaped in shape, with a cavity inside, a first circular hole is provided at the center of one side of the filter box 308, and a second circular hole is provided at the center of the other side, wherein the first circular hole is connected to the water inlet of the first tube body 301, and the second circular hole is connected to the water outlet of the second tube body 304.

[0050] Furthermore, the inner diameter of the filter box 308 is at least twice the inner diameter of the first tube body 301 , and the filter element is filter cotton 4 , which is installed inside the filter box 308 .

[0051] It should be noted that, due to the large inner diameter of the filter box 308 , the size of the filter cotton 4 installed in the filter box 308 is large, so that the filter cotton 4 has a large filtering area and can be used for a longer time, thereby increasing the service life of the anti-blocking component 3 .

[0052] It should be noted that the structure of the second tube body 304 in this embodiment is completely the same as that of the second tube body 304 in the first embodiment, with a slight difference, specifically, a truncated cone-shaped pipe is connected to one end of the second tube body 304 in this embodiment close to the filter box 308, a tapered surface 306 is formed on the side of the pipe, and one end of the pipe is connected to the second circular hole of the filter box 308. The other structures are the same as those of the second tube body 304 in the first embodiment.

[0053] The structure of the first tube body 301 in this embodiment is slightly different from that of the first tube body 301 in the first embodiment, specifically, the length of the first tube body 301 in this embodiment is less than that of the first tube body 301 in the first embodiment, the first tube body 301 is no longer provided with a stepped pipe structure, and the first protrusion 302 is directly provided on the side of the first tube body 301 at one end close to the filter box 308. The other structures are the same as those of the first tube body 301 in the first embodiment.

[0054] Embodiment three:

[0055] like Figure 6 , Figure 7 and Figure 8 As shown, this third embodiment provides an anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer, which includes an anti-blocking member 3, which is different from the anti-blocking members 3 in the first and second embodiments.

[0056] In this embodiment, the anti-blocking member 3 is directly and detachably mounted on the liquid inlet of the liquid inlet pipe 1 and does not need to be used in conjunction with the hose 2 .

[0057] Specifically, the anti-blocking member 3 includes a cover 307, a first tube 301 and a filter 5, wherein the first tube 301 is identical in structure to the first tube 301 in the second embodiment and will not be described in detail herein. The cover 307 is in the shape of a bottle cap, with a circular hole provided at the center of the side of the cover 307, the side of the cover 307 is connected to the water inlet of the first tube 301, the internal cavity of the cover 307 is connected to the tube cavity of the first tube 301, and the filter 5 is installed in the cavity of the cover 307.

[0058] So when using, Figure 8As shown, first, the water outlet end of the anti-blocking component 3 is inserted into the liquid inlet port of the liquid inlet pipe 1, and the first protrusion 302 on the first tube body 301 will open the liquid inlet port of the liquid inlet pipe 1 and make the liquid inlet pipe 1 tightly fit on the side of the first protrusion 302 and the outer side of the water outlet end of the first tube body 301 to ensure the sealing of the connection between the anti-blocking component 3 and the liquid inlet pipe 1, and then an elastic rubber ring is sleeved on the part of the first tube body 301 between the limiting protrusion 303 and the first protrusion 302, and the elastic rubber ring plays the role of tightening the liquid inlet pipe 1, so that the liquid inlet pipe 1 can fit more closely on the side of the part of the first tube body 301 between the limiting protrusion 303 and the first protrusion 302, which can further enhance the sealing performance of the connection between the first tube body 301 and the liquid inlet pipe 1. The filter 5 arranged inside the cover body 307 can intercept impurities and residues in the sample by the filter element and prevent them from entering the liquid inlet pipe 1, thereby greatly reducing the probability of the liquid inlet pipe 1 being blocked, avoiding the problem of atomic absorption spectrophotometer failure caused by blockage of the liquid inlet pipe 1, thereby reducing maintenance costs, and because the impurities and residues are intercepted, the experimental results are more accurate and reliable.

[0059] It should be noted that the inner diameter of the cover body 307 is at least three times the inner diameter of the first tube body 301. The diameter of the cavity in the cover body 307 is set to be larger than the diameter of the tube cavity of the first tube body 301. The purpose is to facilitate the manufacture and installation of the filter 5. Because the diameter of the liquid inlet pipe 1 is only 5 mm, the corresponding diameter of the tube cavity of the first tube body 301 will also be very small. Installing the filter 5 in the tube cavity of the first tube body 301 will increase the difficulty of manufacturing and installing the filter 5. In the present application, by installing the filter 5 inside the cover body 307, the diameter of the cover body 307 is much larger than the diameter of the first tube body 301, and the size of the corresponding filter 5 is relatively large, which can reduce the difficulty of manufacturing and installing the filter 5.

[0060] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer, characterized in that: The anti-blocking component (3) comprises a tube body, wherein the tube body has a tube cavity, one end of the tube cavity is a water inlet end, and the other end is a water outlet end, wherein the water inlet end is used to be connected to the liquid inlet of the liquid inlet pipe (1); A first protrusion (302) is provided on the side surface of the water outlet end of the tube body, and the sum of the thickness of the first protrusion (302) and the outer diameter of the water outlet end of the tube body is greater than the inner diameter of the liquid inlet pipe (1); When the water outlet end of the tube body is inserted into the interior of the liquid inlet tube (1), the first protrusion (302) opens the liquid inlet of the liquid inlet tube (1) and the inner wall of the liquid inlet tube (1) fits against the outer surface of the tube body; At least one filter element for filtering samples is arranged in the lumen of the tube body.

2. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 1, characterized in that: The anti-clogging protection device also comprises a hose (2), one end of which is detachably connected to the water inlet end of the pipe body, and the inner diameter of the hose (2) is smaller than the inner diameter of the liquid inlet pipe (1).

3. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 2, characterized in that: The outer diameter of the water inlet end of the tube body is smaller than the outer diameter of the water outlet end thereof, a second protrusion (305) is provided on the side of the water inlet end of the tube body, and the sum of the thickness of the second protrusion (305) and the outer diameter of the water inlet end of the tube body is greater than the inner diameter of the hose (2).

4. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 3, characterized in that: A limiting protrusion (303) is provided on the side surface of the tube body close to the water outlet end. When the water outlet end of the tube body is inserted into the liquid inlet pipe (1), the first protrusion (302) opens the liquid inlet of the liquid inlet pipe (1) and the inner wall of the liquid inlet pipe (1) fits the portion of the tube body between the limiting protrusion (303) and the water outlet end.

5. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 4, characterized in that: From the water outlet of the tube body to the first protrusion (302), the outer diameter of the tube body gradually increases.

6. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 4, characterized in that: From the water inlet of the tube body to the second protrusion (305), the outer diameter of the tube body gradually increases.

7. An anti-blocking protection device for a liquid inlet pipe of an atomic absorption spectrophotometer according to any one of claims 1 to 6, characterized in that: The filter element is filter cotton (4), and the filter cotton (4) is cylindrical.

8. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 1, characterized in that: A cover body (307) is provided at the water inlet end of the tube body. The cover body (307) is in communication with the tube body. At least one filter screen (5) is provided inside the cover body (307).

9. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 8, characterized in that: A limiting protrusion (303) is provided on the side of the tube body. When the water outlet end of the tube body is inserted into the liquid inlet pipe (1), the first protrusion (302) opens the liquid inlet of the liquid inlet pipe (1) and the inner wall of the liquid inlet pipe (1) fits the part of the tube body between the limiting protrusion (303) and the water outlet end.

10. The anti-blocking protection device for the liquid inlet pipe of an atomic absorption spectrophotometer according to claim 9, characterized in that: The inner diameter of the cover body (307) is at least three times the inner diameter of the tube body.

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