CN205209947U - Advance infrared liquid sample cell device of pattern and infrared sample cell in succession - Google Patents

Abstract

The utility model provides a simple structure facilitates the use, and one kind of the testing result accuracy is advanced the infrared liquid sample cell device of pattern integration in succession and includes the sample cell with infrared sample cell, sample cell device, advances a kind pipe, play appearance pipe and a sample cell support, the sample cell includes that top surface, bottom surface, front, the back and side are sealed by the cell body that passes through the infrared material preparation, and the front and the back of cell body are the infrared transmission face, and the cell body top surface is provided with two openings, is used for respectively connecting to advance the appearance pipe and going out the appearance pipe, sets up the sample chamber of holding need checking sample's usefulness in the cell body, two openings of cell body top surface switch on with the sample chamber respectively.

Description

A continuous feeding infrared liquid sample cell device and infrared sample cell

technical field

The utility model relates to instruments and equipment used for infrared spectrum detection and analysis, in particular to a sample holding device used for infrared spectrum detection and analysis of liquid samples.

Background technique

Infrared spectroscopy (Infrared Spectroscopy, IR) research began in the early 20th century, since the advent of infrared spectrometer in 1940, infrared spectroscopy has been widely used in organic chemistry research. In organic molecules, the atoms that make up chemical bonds or functional groups are in a state of constant vibration, and its vibration frequency is comparable to that of infrared light. Therefore, when organic molecules are irradiated with infrared light, the chemical bonds or functional groups in the molecules can undergo vibrational absorption. Different chemical bonds or functional groups have different absorption frequencies and will be in different positions on the infrared spectrum, so that the chemical bonds or functional groups contained in the molecule can be obtained. Information.

Therefore, in order to obtain the information of chemical bonds or functional groups of organic molecules, it is often necessary to measure them by infrared spectroscopy. For liquid samples, the traditional method is to utilize the liquid film method. In the process of realizing the utility model, the inventor finds that it has the following problems. The liquid film method is only suitable for non-volatile samples, and the contact angle of non-polar solvents is too small , it is not easy to form a liquid film, and it is difficult to prepare samples with the above-mentioned device; and due to the uncertainty of manual operation, the error of the obtained results is relatively large, and it can only be used for qualitative analysis.

In recent years, technicians in the industry have successively invented liquid sample cell devices for infrared detection such as fixed liquid sample cell devices. Specifically, more information related to the above technical solutions can be found in the following documents:

Application number: 201310235997.4, a Chinese patent application document titled "A Liquid Sample Cell for Mid-Infrared Spectroscopy Analysis";

Application number: 201420761959.2, a Chinese patent application document titled "Mid-infrared Spectrometer";

Application number: 200920107183.1, a Chinese patent application document titled "Infrared spectrum variable temperature dual liquid sample cell device";

Publication number: CN102706804A, a Chinese patent application document titled "Far Infrared Sample Pool";

Publication number: CN104646082A, a Chinese patent application document titled "Constant Temperature Infrared Liquid Sample Cell";

Publication number: CN204027995U, a Chinese patent application document titled "a constant temperature sample cell device".

From the above documents, it can be found that the basic structure of the infrared sample cell device in the prior art includes: a sample cell body, a gasket and a window, wherein the sample cell body is made of metal and other materials, and there are accommodating gaskets and windows inside. The concave part of the sheet, the window includes an upper window and a lower window, and the window is usually made of infrared-transmitting materials such as calcium fluoride. The upper window and the lower window are separated by a gasket, which is a hollow shape such as an O shape, and the space between the upper window and the lower window is used to place the liquid sample to be measured. Between the upper and lower windows, the gasket and the sample cell body, gaskets and other structures are used to seal the liquid to be measured. When placing the sample to be tested, first open the sample cell body, place the lower window and gasket, then drop the liquid to be tested, cover the upper window, then close the sample cell body, press the upper and lower windows through the sample cell body, Prepare the liquid sample cell assembly to be tested.

In the process of realizing the utility model, the inventor found that although the fixed liquid sample pool device that appeared in recent years can be used to measure volatile liquids, the assembly of the whole device is relatively complicated, the windows are easily damaged, and the thickness of the liquid film is difficult to control and difficult to clean. and other shortcomings, so that its use has been limited. Moreover, manual sampling takes a long time for a single operation, and the sampling frequency cannot be increased to achieve the purpose of real-time tracking and monitoring of the reaction pool.

Utility model content

Therefore, it is necessary to provide an infrared liquid sample cell device and an infrared sample cell with simple structure, convenient use and accurate detection results.

In order to achieve the above object, the inventor provides a continuous feeding infrared liquid sample cell device, which is characterized in that it includes a sample cell, a sample inlet tube, a sample outlet tube and a sample cell bracket;

The sample cell includes a cell body made of infrared-transmitting material. The top, bottom, front, back and sides of the cell body are sealed. The cell body is provided with a sample cavity for accommodating the sample to be tested. Infrared transmission surface, the top surface of the cell body is provided with a first opening and a second opening, which are respectively used to connect the sampling tube and the sampling tube. The outer wall of the sampling tube is pluggable with the inner wall of the first opening. The outer wall is pluggably fitted with the inner wall of the second opening. When the sample inlet tube is plugged into the first opening and the sample outlet tube is plugged into the second opening, the plug joints are in a liquid-tight fit. The first opening and The second openings are respectively connected to the sample cavity;

The sample cell support includes a back plate and a positioning groove, the positioning groove is connected to the back plate, the groove of the positioning groove is compatible with the sample cell body, the sample cell body and the positioning groove can be plugged and matched, and the positioning groove The direction of the groove is parallel to the back plate. After the sample cell body is inserted into the positioning groove, the front and back of the sample cell body are parallel to the back plate. The positioning groove corresponds to the position of the front and back of the sample cell body. The back plate corresponds to the position of the back of the sample cell body and the first light-transmitting part, and a second light-transmitting part is opened.

Optionally, the outer contour of the pool is a cuboid, the pool body is made of calcium fluoride material, and the positioning groove is in a U-shaped structure.

Optionally, the sample inlet tube and the sample outlet tube respectively include a connector and a connector tube, one end of the inlet tube through the connector is pluggably fitted with the first opening, and the sample outlet tube passes through one end of the connector It is pluggably matched with the second opening, the other end of the connector is pluggably matched with the connecting pipe, and the connector is liquid-tightly matched with the socket of the connecting pipe.

Optionally, the infrared liquid sample pool device also includes a sample pump and a reactor, the reactor and the sample pool are connected through a sample pipeline, the sample pipeline includes a sample inlet tube and a sample outlet tube, and the sample pump Set on the sample line.

Optionally, the sample pump is a peristaltic pump, the peristaltic pump includes a pump head and a power mechanism, and mounting holes are arranged on the back plate, the peristaltic pump is installed on the back plate, and the pump head is installed on the back plate One side of the plate is provided with a sample pool, the power mechanism is installed on the other side of the back plate, and the transmission shaft of the power mechanism passes through the installation hole and is connected with the pump head.

Optionally, the connection method between the back plate and the positioning groove is selected from: screw connection, clamping, welding and bonding.

Optionally, the back plate is a metal plate, and the positioning groove is a plastic groove, a rubber groove or a metal groove.

The inventor also provides a continuous feed type infrared liquid sample cell, the sample cell includes a cell body made of infrared-transmitting material, the top surface, bottom surface, front, back and sides of the cell body are sealed, and the front and back of the cell body are infrared On the transmission surface, the top surface of the cell body is provided with a first opening and a second opening, which are respectively used to connect the sampling tube and the sampling tube. The outer wall of the sampling tube is pluggable with the inner wall of the first opening, and the outer wall of the It can be plugged and matched with the inner wall of the second opening. When the sample inlet tube is plugged into the first opening and the sample outlet tube is plugged into the second opening, the plug joints are liquid-tightly matched, and there is a storage space in the cell body. A sample cavity for measuring samples, the first opening and the second opening are respectively connected to the sample cavity;

Optionally, the outer contour of the pool is a cuboid, the pool body is made of calcium fluoride material, and the positioning groove is in a U-shaped structure.

Optionally, cross-sections of the first opening and the second opening are circular.

The inventor also provides a continuous feeding infrared liquid sample cell. The sample cell includes a cell body made of infrared-transmitting material. The top, bottom, front, back and sides of the cell body are sealed, and the front and back of the cell body are infrared transmission surfaces. , the top surface of the cell body is provided with a first opening and a second opening, which are respectively used to connect the sample inlet tube and the sample outlet tube. The inner walls of the two openings can be plugged and matched. When the sample inlet tube is plugged into the first opening and the sample outlet tube is plugged into the second opening, the plugs are liquid-tightly matched, and there is a hole in the cell body to accommodate the sample to be tested. The sample chamber for the purpose, the first opening and the second opening are respectively connected to the sample chamber;

Optionally, the outer contour of the pool is a cuboid, the pool body is made of calcium fluoride material, and the positioning groove is in a U-shaped structure.

Optionally, the two openings are respectively a first opening and a second opening, the sample inlet tube is sealed and connected to the first opening through a sealing connector, and the sample outlet tube is sealed and connected to the second opening through a sealing connector.

Optionally, cross-sections of the first opening and the second opening are circular.

Different from the prior art, when the above technical solution is in use, the liquid sample is directly added through the notch of the sample chamber on the top of the sample pool. Since the bottom, front, back and side of the pool body are sealed, an integrated liquid sample pool is formed, so The cumbersome process of building the sample pool is omitted, and there is no problem of liquid sample leakage due to operational errors during the building process or liquid tightness of the vessel. Moreover, due to the integrated liquid sample pool structure, the size of the sample cavity is fixed, so the thickness of the liquid sample in the sample cavity is fixed, and the measurement accuracy is high. When measuring, insert the sample cell filled with the sample into the positioning groove of the sample cell bracket and fix it, and insert it into the sample position of the infrared spectrometer through the back plate of the sample cell bracket for detection. When the sample needs to be replaced, remove the sample cell from the sample cell It is very convenient to pull out from the positioning slot of the bracket.

Moreover, through the cooperation of the sample inlet tube and the sample outlet tube, the liquid sample to be tested can be continuously introduced into the sample cavity, which is convenient for sampling from the reaction pool to observe the compounding process of the reactant, and the operation time of manual sampling is omitted in the middle, which improves The sampling frequency is improved, and the accuracy of continuous observation is also improved. And the sealing structure is formed by the sample inlet tube, the sample outlet tube and the sample pool, which improves the safety of detecting volatile or toxic liquids.

Description of drawings

Fig. 1 (a) is the schematic diagram of the three-dimensional structure of the continuous feeding infrared liquid sample pool device described in the specific embodiment;

Fig. 1 (b) is the schematic diagram of the three-dimensional structure of the continuous feeding infrared liquid sample pool device described in the specific embodiment;

Fig. 1 (c) is the schematic diagram of the three-dimensional state when the continuous feeding infrared liquid sample cell device described in the specific embodiment is in use;

Fig. 2 (a) is the schematic diagram of the three-dimensional structure of the continuous feeding style infrared liquid sample pool described in the specific embodiment;

Fig. 2 (b) is a schematic diagram of the cross-sectional structure formed by the cut plane parallel to the side of the sample cell described in the specific embodiment;

Fig. 2 (c) is the structural schematic view along the top view angle along the sample pool described in the specific embodiment;

Fig. 2(d) is a structural schematic view along the angle of view parallel to the back plate along the sample cell described in the specific embodiment;

Fig. 3 is a schematic diagram of the three-dimensional structure of the backboard described in the specific embodiment;

Fig. 4 (a) is the schematic diagram of the three-dimensional structure of the positioning groove described in the specific embodiment;

Fig. 4(b) is a schematic cross-sectional structural view of the positioning grooves in the specific embodiment formed along a cut plane parallel to the back plate 30;

Fig. 5 is a schematic cross-sectional structure diagram of the positioning groove in a specific embodiment formed along a cut plane parallel to the front of the sample cell.

Explanation of reference signs:

10. Pool body,

101. The first opening,

102, the second opening,

105, sample cavity,

121, the top of the pool body,

122. The side of the pool body,

123, the bottom surface of the pool body,

125. Pond front,

126. The back of the pool body,

20. Positioning groove,

210. The first light-transmitting part,

212, the groove of the positioning groove,

218, screw hole,

30. Backplane,

317. The second light-transmitting part,

311, mounting holes,

40. Injection tube,

50. Sample tube,

60. Peristaltic pump,

601. Pump head;

602, motor;

70. Straight head sealing connector.

detailed description

In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

Please refer to Fig. 1 (a) to Fig. 5, the present embodiment provides a kind of continuous feeding pattern infrared liquid sample pool device, comprises sample pool, sample tube, sample tube and sample pool bracket; Wherein sample pool is integrated infrared Liquid sample cell.

As shown in Figures 1 (a) to 1 (b) and Figures 2 (a) to 2 (d), the sample cell includes a cell body 10 made of an infrared-transmitting material, a top surface 121 of the cell body, and a bottom surface 123 of the cell body , the pool body front 125, the pool body back 126 and the pool body side 122 are sealed, the front and the back of the pool body are infrared transmission surfaces, the pool body is provided with a sample cavity 105 for accommodating samples to be tested, and the top surface of the pool body is provided with Two openings, respectively the first opening 101 and the second opening 102, are respectively used to connect the sample inlet tube 40 and the sample outlet tube 50, and a sample cavity 105 for accommodating the sample to be tested is provided in the cell body, and the top of the cell body is The two openings on the surface (the first opening 101 and the second opening 102 ) are respectively connected to the sample chamber 105 . The first opening 101 and the second opening 102 are respectively used to connect the sample inlet tube and the sample outlet tube. Pull fit, when the sample tube is plugged into the first opening and the sample tube is plugged into the second opening, the joints are liquid-tightly fitted, at this time the sample tube is connected to the sample tube and the sample inside the sample cell The cavities together form a closed cavity.

In the above embodiments, the infrared-transmitting material used to prepare the cell body is calcium fluoride material.

In the embodiment shown in Fig. 2(a) to Fig. 2(d), the outer contour of the cell is a cuboid, and the cuboid cell body is easy to process and produce, and it is also convenient to insert and fit with the positioning groove of the sample cell bracket. Of course, in other embodiments, the cell body of the sample cell may be in the shape of a flat cylinder, or a shape such as a triangular or trapezoidal flat prism in cross section. The front of the pool body and the back of the pool body.

In the embodiment shown in Fig. 2 (a) ~ Fig. 2 (d), the sample chamber 105 is a three-dimensional space, which has two faces parallel to the front 125 of the cell body and the back 126 of the cell body, and the sample chamber 105 is connected to the first opening 101 and the back of the cell body. The second opening 102 conducts.

The perspective view of the cell body is shown in Figure 2(c) and Figure 2(d), the thickness of the sample chamber 105 is very thin, so that the liquid sample to be detected is prepared as a thin liquid sample film, and the liquid to be detected is obtained from The opening 101 leads into a sample chamber 105 . The radial dimensions of the first opening 101 and the second opening 102 are larger than the thickness of the sample cavity 105 . One of the first opening 101 and the second opening 102 is used as a liquid inlet, and the other is used as a liquid outlet, which solves the problem that the thickness of the sample chamber 105 is too small to lead to the difficult introduction of the liquid to be tested; It is poured out from the first opening 101 and the second opening 102 . The two openings are the sample inlet tube 40 and the sample outlet tube 50 respectively, which solve the problem that the liquid sample to be tested is continuously introduced into the cell.

Preferably, the sample inlet tube and the sample outlet tube respectively include a connector and a connecting tube, and the connector is preferably a sealed connector; one end of the connector is in fluid-tight fit with the inner wall of the first opening, and the other end is in fluid-tight fit with the connecting tube. One end of the sample inlet tube is pluggably matched with the first opening through the connector, and the one end of the sample outlet tube is pluggably matched with the second opening through the connector. When in use, the connection tube can be plugged and unplugged to reduce the The plugging and unplugging of the connector can effectively prolong the wear of the first opening and the second opening, and prolong the service life of the sample pool.

The connecting pipe can be rubber pipe, glass pipe, pvc pipe and so on.

Preferably, the first opening 101 and the second opening 102 are hollowed out cylinders, and their cross-sections are circular, so as to connect the sample tube 50 and the sample tube 40 respectively through a sealing connector, and the sealing connector can be a straight head sealing connection parts, or elbow seal connections. According to the size of the joint of the connecting piece, the radial dimensions of the first opening 101 and the second opening 102 are also different, and the straight head sealing connecting piece 70 shown in Fig. 4(a) and Fig. 4(b) is preferably used. Of course, the cross-sections of the first opening 101 and the second opening 102 and the corresponding sample inlet tube and sample outlet tube can also be other shapes, such as polygons such as hexagon. When in use, it matches the direction of sample introduction and sample discharge. When the first opening is used for sample introduction and the second opening is used for sample discharge, the first opening is also called a sample inlet, and the second opening is also called a sample inlet. called the sample outlet.

The liquid mixture in the reaction pool (or reactor) is the source of the sample to be tested.

The infrared liquid sample pool device also includes a sample pump and a reactor, the reactor and the sample pool are connected through a sample pipeline, the sample pipeline includes a sample inlet tube and a sample outlet tube, and the sample pump is arranged on the sample pipeline, It is used to transfer the sample to be tested in the reactor to the sample pool. On the other hand, the sample in the sample pool is output (for example, sent to a reactor or a trash can) through the function of the sample pump.

The sample pump can be a peristaltic pump, the peristaltic pump includes a pump head and a power mechanism, the back plate is provided with mounting holes, the peristaltic pump is installed on the back plate, the pump head is installed on the back plate and is provided with One side of the sample pool, the power mechanism is installed on the other side of the back plate, and the transmission shaft of the power mechanism is connected with the pump head through the installation hole.

As shown in FIG. 1(a) and FIG. 1(b), the sampling tube 50 is connected to the outlet hose of the peristaltic pump, and the inlet hose of the peristaltic pump is connected to the reaction pool. In some other embodiments, the inlet hose of the peristaltic pump can also be connected to the sample tube (as shown in the figure, arrows C and D indicate the flow direction of the liquid to be tested). During the detection process, the reaction mixture in the reaction cell is continuously introduced into the sample cell by a peristaltic pump for continuous detection to monitor the degree of compounding in the reaction cell. The flow rate of the sample to be tested can also be controlled by the peristaltic pump.

As shown in Figure 1(a), Figure 1(b) and Figure 3, the peristaltic pump 60 is fixed on the back plate 30, and the connection between the back plate and the peristaltic pump can be screw connection, clamping, welding or bonding . Specifically, in the embodiment shown in FIG. 3 , a mounting hole 321 is opened on the back plate 30, and a corresponding mounting hole is opened on the peristaltic pump 60. The pump head 601 of the peristaltic pump passes through the mounting hole 321 on the back plate, Located on the same side as the sample cell, the power mechanism of the peristaltic pump, such as the motor 602 in FIG. 1( b ), is located on the other side of the back plate. Screwed to the corresponding screw hole of the peristaltic pump.

As shown in Fig. 1 (a), Fig. 1 (b), Fig. 3, Fig. 4 (a) and Fig. 4 (b), the sample cell support includes a back plate 30 and a positioning groove 20, and the positioning groove 20 and The back plate 30 is connected, the groove 212 of the positioning groove is adapted to the cell body 10 of the sample cell, the cell body 10 of the sample cell is pluggably matched with the positioning groove, and the direction of the groove of the positioning groove is parallel to the back plate, so that the cell body 10 After being inserted into the positioning slot, the front 125 of the pool body and the back 126 of the pool body are parallel to the back plate 30, and the positioning slot corresponds to the position of the front 125 of the pool body and the back 126 of the pool body, and a first light-transmitting portion 210 is provided, so that the positioning slot 20 as a whole has a shape of U-shaped structure.

The back plate corresponds to the position of the back of the sample cell and the first light-transmitting part, and a second light-transmitting part 317 is opened. During detection, the infrared light passes through the first light-transmitting part 210 and the second light-transmitting part 317 and passes through the sample cell body 10 to realize the detection of the sample.

The connection mode between the back plate and the positioning groove can be screw connection, card connection, welding or bonding. Specifically, in the embodiment shown in Figure 3, Figure 4(a) and Figure 4(b), a through hole 317 is provided on the back plate 30, and a screw hole 218 is provided on the positioning groove 20, and through the through hole 317, and screwed to the screw hole 218, the back plate 30 and the positioning groove 20 are fixed.

In an embodiment, the back plate 30 can be a metal plate, such as a stainless steel plate, an aluminum alloy plate, a copper alloy plate, etc. Of course, a plastic plate can also be used.

The positioning groove is a plastic groove, a rubber groove or a metal groove, such as polytetrafluoroethylene material.

When in use, place the sample cell on its side as shown in Figure 1(c), so that the sample inlet is located below the sample outlet, which facilitates the liquid sample to fill the entire cavity, and is also conducive to the uniform flow of the sample, making the detection result more accurate. It can be understood that the position of the peristaltic pump relative to the sample pool is optional, and in different embodiments, the peristaltic pump can be located at any position relative to the sample pool. In an embodiment shown in Figure 1 (c), the arrow on the sample tube indicates the direction of liquid flow, and the peristaltic pump 60 sends the liquid sample to be detected into the sample pool 10, and the liquid sample to be detected enters from the bottom. The sample port (the sample inlet is connected with the sample tube 40) enters the sample cell, and leaves the sample cell 10 from the sample outlet (the sample port is connected with the sample tube 50) above, so that bubbles will not appear in the sample cell like this, and the liquid The sample fills the entire cavity of the sample cell.

When the above-mentioned embodiment is in use, the liquid sample is directly added through the first opening or the second opening of the sample cavity on the top of the sample pool, and an integrated liquid sample pool is formed due to the sealing of the top, bottom, front, back and side of the pool body , so the cumbersome process of building the sample pool is omitted, and there is no problem of liquid sample leakage due to operational errors during the building process or liquid tightness of the vessel. Moreover, due to the integrated liquid sample pool structure, the size of the sample cavity is fixed, so the thickness of the liquid sample in the sample cavity is fixed, and the measurement accuracy is high. When measuring, insert the sample cell filled with the sample into the positioning groove of the sample cell bracket and fix it, and insert it into the sample position of the infrared spectrometer through the back plate of the sample cell bracket for detection. The cell is pulled out from the positioning groove of the sample cell holder, which is very convenient.

Moreover, through the cooperation of the sample inlet tube and the sample outlet tube, the liquid sample to be tested can be continuously introduced into the sample cavity, which is convenient for sampling from the reaction pool to observe the compounding process of the reactant, and the operation time of manual sampling is omitted in the middle, which improves The sampling frequency is improved, and the accuracy of continuous observation is also improved. And the sealing structure is formed by the sample inlet tube, the sample outlet tube and the sample pool, which improves the safety of detecting volatile or toxic liquids.

It can be understood that by continuously introducing the liquid sample to be tested, it is also beneficial to continuously test and collect kinetic information of the liquid to be tested, so as to facilitate the detection of the chemical reaction occurring in the sample in real time. At the same time, when cleaning, the moving direction of the cleaning liquid is in the forward direction, and then reversed, so that the cycle is repeated several times. The moving direction of the cleaning liquid is controlled by the peristaltic pump, which solves the problem that the washing from the bottom to the top may not be in place.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or terminal equipment comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements identified, or also include elements inherent in such a process, method, article, or end-equipment. Without further limitations, an element defined by the words "comprising..." or "comprising..." does not exclude the presence of additional elements in the process, method, article or terminal device comprising said element. In addition, in this article, "greater than", "less than", "exceeding" and so on are understood as not including the original number; "above", "below", "within" and so on are understood as including the original number.

Although the above-mentioned embodiments have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts, so the above is only a summary of the present utility model. The embodiment does not limit the scope of patent protection of the present utility model, and any equivalent structure or equivalent process conversion made by using the specification of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields, is the same. Included within the scope of patent protection of the utility model.

Claims (10)

1. A continuous type infrared liquid sample pool device, characterized in that it comprises a sample pool, a sample inlet tube, a sample outlet tube and a sample pool bracket; The sample cell includes a cell body made of infrared-transmitting material. The top, bottom, front, back and sides of the cell body are sealed. The cell body is provided with a sample cavity for accommodating the sample to be tested. Infrared transmission surface, the top surface of the cell body is provided with a first opening and a second opening, which are respectively used to connect the sampling tube and the sampling tube. The outer wall of the sampling tube is pluggable with the inner wall of the first opening. The outer wall is pluggably fitted with the inner wall of the second opening. When the sample inlet tube is plugged into the first opening and the sample outlet tube is plugged into the second opening, the plug joints are in a liquid-tight fit. The first opening and The second openings are respectively connected to the sample cavity; The sample cell support includes a back plate and a positioning groove, the positioning groove is connected to the back plate, the groove of the positioning groove is compatible with the sample cell body, the sample cell body and the positioning groove can be plugged and matched, and the positioning groove The direction of the groove is parallel to the back plate. After the sample cell body is inserted into the positioning groove, the front and back of the sample cell body are parallel to the back plate. The positioning groove corresponds to the position of the front and back of the sample cell body. The back plate corresponds to the position of the back of the sample cell body and the first light-transmitting part, and a second light-transmitting part is opened. 2 . The device of continuous feeding infrared liquid sample cell according to claim 1 , wherein the outer contour of the cell is a cuboid, the cell body is made of calcium fluoride material, and the positioning groove is in a U-shaped structure. 3. continuous feeding style infrared liquid sample pool device according to claim 1, is characterized in that, described sampling pipe and sample outlet pipe respectively comprise connecting head and connecting pipe, and described sampling pipe connects with one end of connecting head and The first opening can be plugged and fitted, the sample outlet tube can be plugged and fitted with the second opening through one end of the connecting head, the other end of the connecting head can be plugged and fitted with the connecting pipe, and the joint between the connecting head and the connecting pipe is liquid Seal fit. 4. The continuous feeding infrared liquid sample pool device according to claim 1, characterized in that, the infrared liquid sample pool device also includes a sample pump and a reactor, and the reactor and the sample pool are connected by a sample pipeline, The sample pipeline includes a sample inlet tube and a sample outlet tube, and the sample pump is arranged on the sample pipeline for transporting the sample to be tested in the reactor to the sample pool. 5. The continuous feeding infrared liquid sample cell device according to claim 4, wherein the sample pump is a peristaltic pump, the peristaltic pump includes a pump head and a power mechanism, and the back plate is provided with mounting holes , the peristaltic pump is installed on the back plate, the pump head is installed on the side of the back plate provided with the sample pool, the power mechanism is installed on the other side of the back plate, the transmission shaft of the power mechanism passes through the installation hole and the pump head connect. 6 . The continuous feeding infrared liquid sample cell device according to claim 1 , wherein the connection method between the back plate and the positioning groove is selected from: screw connection, clip connection, welding and bonding. 7 . The continuous-feed infrared liquid sample cell device according to claim 1 , wherein the back plate is a metal plate, and the positioning groove is a plastic groove, a rubber groove or a metal groove. 8. A continuous feeding pattern infrared liquid sample cell is characterized in that, the sample cell comprises a cell body prepared by an infrared-transmitting material, the cell body is provided with a sample cavity for accommodating the sample to be measured, the top surface of the cell body, The bottom, front, back and sides are sealed. The front and back of the cell body are infrared transmission surfaces. The outer wall is pluggably fit with the inner wall of the first opening, and the outer wall of the sample outlet tube is pluggably fit with the inner wall of the second opening. When the sample inlet tube is plugged into the first opening, and the sample outlet tube is plugged into the second opening When it is in the middle position, the plug joint is in liquid-tight fit, and the first opening and the second opening are respectively connected to the sample chamber. 9 . The continuous feeding infrared liquid sample cell according to claim 8 , wherein the outer contour of the cell is a cuboid, the cell body is made of calcium fluoride material, and the positioning groove is in a U-shaped structure. 10 . The continuous feeding infrared liquid sample cell according to claim 8 , wherein the cross-sections of the first opening and the second opening are circular. 11 .