Liquid-phase ultraviolet visible light detector

Abstract

The utility model discloses a liquid phase ultraviolet visible light detector, belongs to the technical field of liquid chromatography equipment, the liquid phase ultraviolet visible light detector comprises a case, a light source assembly, a thermal insulation layer and a monochromator assembly, the light source assembly is installed in the case, the monochromator assembly is installed at the opening of the side face of the light source assembly, and the thermal insulation layer is installed on the monochromator assembly. According to the utility model, by arranging the positions of the deuterium lamp and the tungsten lamp in the light source assembly, the orientation of the tail parts of the deuterium lamp and the tungsten lamp can be limited, the follow-up direction synchronization of the flow cell in the monochromator assembly is matched, and an operator opens the front door of the case, so that the deuterium lamp and the tungsten lamp can be conveniently operated. The tungsten lamp, the deuterium lamp and the flow cell can be clearly and visually observed, subsequent rapid replacement and maintenance are facilitated, the whole part shell does not need to be disassembled, the influence of the external temperature on equipment operation can be stably reduced in cooperation with a heat preservation layer, a temperature control fan and an air duct, and the overall accuracy of the equipment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of liquid chromatography equipment technology, specifically relating to a liquid chromatography ultraviolet-visible light detector. Background Technology

[0002] A liquid chromatography (LC) system is a scientific instrument used for the separation, identification, and quantitative analysis of components in a mixture. It consists of several main parts: a solvent delivery system, an injection system, a column oven, and a detector. The ultraviolet-visible (UV-Vis) detector is the most common, and its performance largely determines the overall performance of the LC system. A UV-Vis detector is an instrument that detects and quantifies components in a sample based on the absorption characteristics of substances to ultraviolet or visible light. Its working principle follows that the absorbance of a substance is proportional to its concentration and the optical path length (the flow cell path length of the detector). Specifically, when light of a specific wavelength passes through a sample, compounds in the sample absorb this light, resulting in a decrease in light intensity. The detector measures this change in light intensity and converts it into an electrical signal, thereby enabling the detection and quantitative analysis of sample components.

[0003] Chinese utility model patent 201020657518X discloses an optical path structure for an ultraviolet-visible light detector, which includes a lamp holder, a convex lens group, a slit, a filter, a plane mirror, a concave grating, a semi-transparent and semi-reflective mirror, a reference receiver, a flow cell, and a sample receiver. The lamp holder can simultaneously install a deuterium lamp and a tungsten lamp. The concave grating is driven by a grating motor via a grating motor mount. Different wavelengths can be selected by rotating the grating motor at different angles.

[0004] The above design, driven by a grating motor, can measure light absorption changes in the range of 190nm to 700nm. However, there are some problems in actual use. Specifically, the device is not convenient to operate and maintain, especially the replacement of the light source, which requires disassembling the instrument casing. At the same time, noise and drift, two common and difficult-to-handle indicators, also need to be improved. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A liquid phase ultraviolet-visible light detector includes a chassis, a light source assembly, an insulation layer, and a monochromator assembly. The light source assembly is installed inside the chassis, and the monochromator assembly is installed at an opening on the side of the light source assembly. An insulation layer is provided outside the light source assembly and the monochromator assembly. The light source assembly includes a tungsten lamp, a tungsten lamp lens, a deuterium lamp, a deuterium lamp holder, and a tungsten lamp holder. The tungsten lamp holder is installed inside the chassis, the deuterium lamp holder is installed on the side of the tungsten lamp holder, the tungsten lamp is installed inside the tungsten lamp holder, and the deuterium lamp is installed inside the deuterium lamp holder. The tungsten lamp and the deuterium lamp are internally connected, and a tungsten lamp lens is installed at the connection between the tungsten lamp and the deuterium lamp.

[0008] As a preferred technical solution of this utility model, the light source assembly further includes a light-transmitting tube, a heat insulation pad, and a deuterium lamp lens assembly. The light-transmitting tube is installed on the side of the deuterium lamp holder and on the side opposite to the tungsten lamp holder. The light-transmitting tube has a hollow tubular structure with openings on both sides. The deuterium lamp lens assembly is installed inside the light-transmitting tube. The opening on the other side of the light-transmitting tube is connected to the monochromator assembly, and the heat insulation pad is installed at the openings on both sides of the light-transmitting tube.

[0009] As a preferred embodiment of this utility model, the tungsten lamp, tungsten lamp lens, deuterium lamp, and deuterium lamp lens group are on the same horizontal line, and the tails of both the tungsten lamp and the deuterium lamp face the front door of the chassis.

[0010] As a preferred embodiment of this invention, the monochromator assembly includes a grating assembly, a semi-transparent mirror, a sample receiver, a flow cell, a reference receiver, a plane mirror, a switching assembly, a slit, and a housing. The housing is mounted on the side of the light source assembly, the slit is mounted inside the housing, the switching assembly is mounted inside the housing and located on the side of the slit, the plane mirror is mounted inside the housing, and the switching assembly, slit, and plane mirror are on the same horizontal line. The grating assembly is mounted inside the housing, the semi-transparent mirror is mounted inside the housing, the sample receiver is mounted on the side wall of the housing, the flow cell is mounted inside the housing between the semi-transparent mirror and the sample receiver, and the reference receiver is inside the housing and located above the semi-transparent mirror.

[0011] As a preferred technical solution of this utility model, the grating assembly includes a grating, a first motor base and a grating motor. The first motor base is installed in the housing, the grating motor is installed at the bottom of the first motor base, the grating is disposed on the upper surface of the first motor base, and the output end of the grating motor passes through the first motor base and is connected to the end of the grating.

[0012] As a preferred technical solution of this utility model, the switching component includes a switching motor, a second motor mount, a wavelength calibration glass, and a filter. The second motor mount is installed inside the housing, the switching motor is installed at the bottom of the second motor mount, the wavelength calibration glass is installed on the surface of the second motor mount, the output end of the switching motor is connected to the end of the wavelength calibration glass, and the filter is installed on the side of the wavelength calibration glass.

[0013] As a preferred technical solution of this utility model, the side of the deuterium lamp holder is provided with an air duct inlet, the inside of the chassis is provided with an air duct on the deuterium lamp holder, and a temperature-controlled fan is installed at the top of the air duct.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In this invention, by setting the installation positions of the deuterium lamp and tungsten lamp in the light source assembly, the orientation of the tails of the deuterium lamp and tungsten lamp can be limited. This is synchronized with the direction of the flow cell in the subsequent monochromator assembly. By opening the front door of the chassis, the operator can clearly and intuitively observe the tungsten lamp, deuterium lamp, and flow cell, facilitating quick replacement and maintenance without disassembling the entire component housing. Furthermore, with the addition of an insulation layer, temperature-controlled fan, and air duct, the impact of external temperature on equipment operation can be stably reduced, improving the overall accuracy of the equipment. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model.

[0017] Figure 2 This is a perspective view of the structure of the light source assembly and monochromator assembly of this utility model.

[0018] Figure 3 This is a perspective view of the grating component structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the switching component in this utility model.

[0020] Figure 5 This is a structural schematic diagram of the outer shell of this utility model from the perspective of the front door.

[0021] The correspondence between the labels and component names in the attached figures is as follows:

[0022] 1. Chassis; 2. Light source assembly; 21. Tungsten lamp; 22. Tungsten lamp lens; 23. Deuterium lamp; 24. Light guide tube; 25. Heat insulation pad; 26. Deuterium lamp lens assembly; 27. Deuterium lamp holder; 28. Tungsten lamp holder; 3. Insulation layer; 4. Monochromator assembly; 41. Grating assembly; 411. Grating; 412. First motor holder; 413. Grating motor; 42. Semi-transparent mirror; 43. Sample receiver; 44. Flow cell; 45. Reference receiver; 46. Plane mirror; 47. Switching assembly; 471. Switching motor; 472. Second motor holder; 473. Wavelength calibration glass; 474. Filter; 48. Slit; 49. Housing; 5. PCB components; 6. Cabinet fan; 7. Air duct inlet; 8. Air duct; 9. Temperature-controlled fan; 10. Air duct outlet. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0026] Depend on Figure 1 As shown, it is a schematic diagram of the structure of the liquid phase ultraviolet-visible light detector in this embodiment. The liquid phase ultraviolet-visible light detector includes a housing 1, a light source assembly 2, a heat insulation layer 3, and a monochromator assembly 4. The light source assembly 2 is installed inside the housing 1, and the monochromator assembly 4 is installed at the side opening of the light source assembly 2. The heat insulation layer 3 is provided on the outside of the light source assembly 2 and the monochromator assembly 4.

[0027] During use, the components in the light source assembly 2 emit light, which enters the monochromator assembly 4. The components in the monochromator assembly 4 then transmit and process the light, calculating the overall absorbance of the equipment during operation. The overall installation of the insulation layer 3 provides external protection for the light source assembly 2 and the monochromator assembly 4, preventing external temperatures from affecting the operation of the equipment and improving the overall stability and accuracy of the equipment.

[0028] From the appendix Figure 2As shown, the light source assembly 2 includes a tungsten lamp 21, a tungsten lamp lens 22, a deuterium lamp 23, a light-transmitting tube 24, a heat insulation pad 25, a deuterium lamp lens group 26, a deuterium lamp holder 27, and a tungsten lamp holder 28. The tungsten lamp holder 28 is installed inside the housing 1, the deuterium lamp holder 27 is installed on the side of the tungsten lamp holder 28, the tungsten lamp 21 is installed inside the tungsten lamp holder 28, and the deuterium lamp 23 is installed inside the deuterium lamp holder 27. The tungsten lamp 21 and the deuterium lamp 23 are internally connected, and a tungsten lamp lens 22 is installed at the connection between the tungsten lamp 21 and the deuterium lamp 23. The light-transmitting tube 24 is installed on the side of the deuterium lamp holder 27 and on the side opposite to the tungsten lamp holder 28. The light-transmitting tube 24 is a hollow tubular structure with openings on both sides. The deuterium lamp lens group 26 is installed inside the light-transmitting tube 24. The other opening of the light-transmitting tube 24 is connected to the monochromator assembly 4. The heat insulation pad 25 is installed at the openings on both sides of the light-transmitting tube 24. The tungsten lamp 21, the tungsten lamp lens 22, the deuterium lamp 23 and the deuterium lamp lens group 26 are on the same horizontal line, and the tails of both the tungsten lamp 21 and the deuterium lamp 23 face the front door of the chassis 1.

[0029] During use, the tungsten lamp 21 and the deuterium lamp 23 emit different light. The light emitted by the tungsten lamp 21 enters the deuterium lamp 23 through the tungsten lamp lens 22 and merges with the light emitted by the deuterium lamp 23. Then, the light passes through the deuterium lamp lens group 26, is focused by the deuterium lamp lens group 26, and is input into the monochromator assembly 4. The tails of the tungsten lamp 21 and the deuterium lamp 23 are in the same direction. When the front door of the chassis 1 is opened, the tungsten lamp 21 and the deuterium lamp 23 can be quickly replaced without disassembling the entire housing of the light source assembly 2, which speeds up the overall maintenance and replacement speed.

[0030] From the appendix Figure 2 As shown, the monochromator assembly 4 includes a grating assembly 41, a semi-transparent mirror 42, a sample receiver 43, a flow cell 44, a reference receiver 45, a plane mirror 46, a switching assembly 47, a slit 48, and a housing 49. The housing 49 is mounted on the side of the light source assembly 2, the slit 48 is mounted inside the housing 49, the switching assembly 47 is mounted inside the housing 49 and located on the side of the slit 48, the plane mirror 46 is mounted inside the housing 49, and the switching assembly 47, the slit 48, and the plane mirror 46 are located on the same horizontal line. The grating assembly 41 is mounted inside the housing 49, the semi-transparent mirror 42 is mounted inside the housing 49, the sample receiver 43 is mounted on the side wall of the housing 49, the flow cell 44 is mounted inside the housing 49 between the semi-transparent mirror 42 and the sample receiver 43, and the reference receiver 45 is inside the housing 49 and located above the semi-transparent mirror 42.

[0031] In use, the light emitted by the tungsten lamp 21 and the deuterium lamp 23 is focused by the deuterium lamp lens group 26 and input into the slit 48. This light then passes through the switching component 47 and illuminates the grating component 41. After the light is split by the grating component 41, the required wavelength component is illuminated by the semi-transparent mirror 42. 10% of the light is reflected to the sensor of the reference receiver 45, and 90% of the light passes through the semi-transparent mirror 42, then through the flow cell 44, and then illuminates the sensor of the sample receiver 43. The signal measured on the reference receiver 45 can represent the intensity I0 of the incident light, and the sampled value measured on the sample receiver 43 can represent the intensity I of the transmitted light. The formula for calculating absorbance can be written as A = lg(I0 / I).

[0032] From the appendix Figure 3 As shown, it is a structural schematic diagram of the grating assembly 41 in this embodiment. The grating assembly 41 includes a grating 411, a first motor base 412 and a grating motor 413. The first motor base 412 is installed inside the outer casing 49. The grating motor 413 is installed at the bottom of the first motor base 412. The grating 411 is disposed on the upper surface of the first motor base 412, and the output end of the grating motor 413 passes through the first motor base 412 and is connected to the end of the grating 411.

[0033] In use, the first motor mount 412 serves as a fixed connection, providing stability for the overall installation of the grating assembly 41. Then, by running the grating motor 413, the rotation angle of the grating 411 can be controlled. Based on the change in the overall angle of the grating 411, a specific wavelength can be selected, thereby realizing the control and selection of the receiving wavelength.

[0034] From the appendix Figure 4 As shown, this is a schematic diagram of the switching component 47 in this embodiment. The switching component 47 includes a switching motor 471, a second motor mount 472, a wavelength calibration glass 473, and a filter 474. The second motor mount 472 is installed inside the housing 49. The switching motor 471 is installed at the bottom of the second motor mount 472. The wavelength calibration glass 473 is installed on the surface of the second motor mount 472. The output end of the switching motor 471 is connected to the end of the wavelength calibration glass 473. The filter 474 is installed on the side of the wavelength calibration glass 473.

[0035] During use, by switching the operation of motor 471, the angles of wavelength calibration glass 473 and filter 474 can be adjusted, allowing wavelength calibration glass 473 and filter 474 to be in the optical path, or neither to be in the optical path. When filter 474 is in the optical path, it can filter out secondary diffraction of ultraviolet light. When wavelength calibration glass 473 is in the optical path, it can put the instrument into wavelength verification or calibration state. The operation of switching motor 471 is used to adjust and change the state of the two. In this embodiment, wavelength calibration glass 473 and filter 474 are installed at 180°.

[0036] From the appendix Figure 1 As shown, in this embodiment, the deuterium lamp holder 27 has an air duct inlet 7 on its side, and the chassis 1 has an air duct 8 on the deuterium lamp holder 27. A temperature-controlled fan 9 is installed at the top of the air duct 8. Air enters the deuterium lamp holder 27 through the air duct inlet 7 and circulates along the channel surrounded by the insulation layer 3. At this time, the operation of the temperature-controlled fan 9 draws in the air, and the air flows into the zero-one section of the chassis 1 through the air duct outlet 10, blowing on the PCB components 5 and power modules inside the chassis 1. The hot air is discharged by the operation of the chassis fan 6, realizing the heat discharge and ensuring the stability of the overall operation of the equipment.

[0037] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A liquid-phase ultraviolet-visible light detector, characterized in that: The system includes a chassis (1), a light source assembly (2), an insulation layer (3), and a monochromator assembly (4). The light source assembly (2) is installed inside the chassis (1), and the monochromator assembly (4) is installed at the side opening of the light source assembly (2). The light source assembly (2) and the monochromator assembly (4) are surrounded by an insulation layer (3). The light source assembly (2) includes a tungsten lamp (21), a tungsten lamp lens (22), a deuterium lamp (23), and a deuterium lamp holder (24). 27) and tungsten lamp holder (28), wherein the tungsten lamp holder (28) is installed inside the housing (1), the deuterium lamp holder (27) is installed on the side of the tungsten lamp holder (28), the tungsten lamp (21) is installed inside the tungsten lamp holder (28), the deuterium lamp (23) is installed inside the deuterium lamp holder (27), the tungsten lamp (21) and the deuterium lamp (23) are internally connected, and a tungsten lamp lens (22) is installed at the connection between the tungsten lamp (21) and the deuterium lamp (23).

2. The liquid-phase ultraviolet-visible detector according to claim 1, characterized in that: The light source assembly (2) also includes a light-transmitting tube (24), a heat insulation pad (25), and a deuterium lamp lens assembly (26). The light-transmitting tube (24) is installed on the side of the deuterium lamp holder (27) and on the side opposite to the tungsten lamp holder (28). The light-transmitting tube (24) has a hollow tubular structure with openings on both sides. The deuterium lamp lens assembly (26) is installed inside the light-transmitting tube (24). The opening on the other side of the light-transmitting tube (24) is connected to the monochromator assembly (4), and the heat insulation pad (25) is installed at the openings on both sides of the light-transmitting tube (24).

3. The liquid-phase ultraviolet-visible detector according to claim 2, characterized in that: The tungsten lamp (21), tungsten lamp lens (22), deuterium lamp (23) and deuterium lamp lens group (26) are on the same horizontal line, and the tails of both the tungsten lamp (21) and the deuterium lamp (23) face the front door of the chassis (1).

4. The liquid-phase ultraviolet-visible detector according to claim 1, characterized in that: The monochromator assembly (4) includes a grating assembly (41), a semi-transparent mirror (42), a sample receiver (43), a flow cell (44), a reference receiver (45), a plane mirror (46), a switching assembly (47), a slit (48), and a housing (49). The housing (49) is mounted on the side of the light source assembly (2), the slit (48) is mounted inside the housing (49), the switching assembly (47) is mounted inside the housing (49) and located on the side of the slit (48), and the plane mirror (46) is mounted on the housing. Inside (49), the switching assembly (47), the slit (48) and the plane mirror (46) are located on the same horizontal line. The grating assembly (41) is installed inside the housing (49). The semi-transparent mirror (42) is installed inside the housing (49). The sample receiver (43) is installed on the side wall of the housing (49). The flow cell (44) is installed inside the housing (49) between the semi-transparent mirror (42) and the sample receiver (43). The reference receiver (45) is inside the housing (49) and located at the top of the semi-transparent mirror (42).

5. The liquid-phase ultraviolet-visible detector according to claim 4, characterized in that: The grating assembly (41) includes a grating (411), a first motor mount (412), and a grating motor (413). The first motor mount (412) is installed inside the outer casing (49). The grating motor (413) is installed at the bottom of the first motor mount (412). The grating (411) is disposed on the upper surface of the first motor mount (412), and the output end of the grating motor (413) passes through the first motor mount (412) and is connected to the end of the grating (411).

6. The liquid-phase ultraviolet-visible detector according to claim 5, characterized in that: The switching assembly (47) includes a switching motor (471), a second motor mount (472), a wavelength calibration glass (473), and a filter (474). The second motor mount (472) is installed inside the housing (49). The switching motor (471) is installed at the bottom of the second motor mount (472). The wavelength calibration glass (473) is installed on the surface of the second motor mount (472). The output end of the switching motor (471) is connected to the end of the wavelength calibration glass (473). The filter (474) is installed on the side of the wavelength calibration glass (473).

7. The liquid-phase ultraviolet-visible detector according to claim 1, characterized in that: The deuterium lamp holder (27) has an air duct inlet (7) on its side, and the chassis (1) has an air duct (8) located on the deuterium lamp holder (27), with a temperature-controlled fan (9) installed at the top of the air duct (8).

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