Filter disc and liquid phase detector

Abstract

The present invention provides a filter disc and a liquid phase detector, which relate to the technical field of liquid chromatography analysis. The filter disc comprises a rotating body with a hollow structure; at least one end of the rotating body is open; the side wall of the rotating body is provided with a plurality of mounting holes along the circumferential direction, the edges of the mounting holes are recessed inward to form a groove for mounting the filter, the bottom surface of the groove is an inclined plane, and the inclined plane is used to be perpendicular to the light entering from the opening. The liquid phase detector comprises a filter disc. The filter disc solves the technical problem that the disc-type filter disc in the prior art requires a large space structure, which brings great difficulties to the miniaturization and compact structure of the instrument.

Description

Technical Field

[0001] The invention relates to the technical field of liquid chromatography analysis, in particular to a filter disc and a liquid phase detector. Background Art

[0002] The liquid detector is a core module component of the high performance liquid chromatograph, responsible for quickly and accurately detecting the components separated by the chromatographic column to achieve qualitative and quantitative analysis.

[0003] In the UV-visible detector, the light emitted by the light source module is converged to the slit through the focusing system. There is a filter disc assembly before the slit. Different filters are selected according to different bands through the motor. After the light passes through the filter and reaches the grating for spectrometry, the light of the specified wavelength enters the flow cell sample and is absorbed. Finally, it is focused on the sensor for detection to realize photoelectric conversion. The processing circuit analyzes and processes the electrical signal to obtain the waveform or parameters required by the user.

[0004] The reason for using filters is that the secondary spectral characteristics of the diffraction grating will cause the long-wave spectrum of the primary spectrum and the short-wave spectrum of the secondary spectrum to be superimposed after the grating splits the light.

[0005] From the grating equation d(sinα+sinβ)=mλ, we know that the first-order (m=1) spectral line with wavelength λ, the second-order (m=2) spectral line with wavelength λ / 2, the third-order (m=3) spectral line with wavelength λ / 3... all have the same diffraction angle. That is, βλ, 1=βλ / 2, 2=βλ / 3, 3=βλ / 4, ... m-1=βλ / m, which is the order overlap of the diffraction grating spectrum. That is, the diffraction grating has spectral lines of different orders and different wavelengths at the same position. When conducting high-resolution spectral research or spectral analysis in a wide band, the order overlap of the grating spectrum is very obvious, and effective measures must be taken to isolate or filter out unnecessary bands; for example, using a pre-monochromator, using filters of corresponding bands, etc., can avoid the interference of unnecessary order spectra, thereby ensuring the resolution of the ultraviolet visible spectrophotometer and the accuracy and reliability of analytical test data.

[0006] In conventional liquid phase detectors, the common form of the filter disc is a concentric disc mode, which is driven by a central motor. The disc-type filter disc requires a larger space structure, which brings great difficulties to the miniaturization and compact structure of the instrument. Summary of the invention

[0007] The object of the present invention is to provide a filter disc and a liquid phase detector to alleviate the technical problem in the prior art that the disc-type filter disc requires a larger space structure, which brings great difficulties to the miniaturization and compact structure of the instrument.

[0008] In a first aspect, an embodiment of the present invention provides a filter disc, comprising: a rotating body having a hollow structure;

[0009] At least one end of the rotating body is open;

[0010] The side wall of the rotating body is provided with a plurality of mounting holes along the circumferential direction, the edges of the mounting holes are recessed inwards to form a groove for mounting the filter, the bottom surface of the groove is an inclined plane, and the inclined plane can be perpendicular to the light entering from the opening.

[0011] Furthermore, the outer surface of the side wall is a conical surface, and the inclined plane is a section of the conical surface.

[0012] Furthermore, the rotating body is a hollow truncated cone structure, and the lower bottom surface of the hollow truncated cone structure is open.

[0013] Furthermore, the wall thickness of the hollow truncated cone structure is equal at all locations.

[0014] Furthermore, the plurality of mounting holes are spaced and evenly arranged along the circumference of the rotating body.

[0015] Furthermore, the number of the plurality of mounting holes is at least two greater than the number of filters to be mounted.

[0016] Furthermore, the cross-sectional shape of the groove is rectangular or circular.

[0017] Beneficial effects:

[0018] The filter disc provided by the present invention adopts a rotating body with a hollow structure, and the side wall of the rotating body is provided with a plurality of mounting holes along the circumferential direction, and the edges of the mounting holes are recessed inward to form a groove, and the filter can be installed in the groove. On the one hand, since the bottom surface of the groove is an inclined plane, the inclined plane is used to be perpendicular to the light entering from the opening, so as to reduce other influences of the filter and ensure the normal propagation of the light; on the other hand, compared with the plane disc filter disc adopted in the prior art, on the basis of the same filter size and number, the filter disc of the present invention can be solved by increasing the side area, and has little impact on the volume of the overall optical unit, that is, the purpose of switching multiple filters can be completed in a smaller space, thereby optimizing the instrument structure and making its structure more delicate and compact.

[0019] In a second aspect, an embodiment of the present invention provides a liquid phase detector, a filter, a housing, a slit plate, and a filter disc as described in any one of the aforementioned embodiments;

[0020] The optical filter is installed in the groove;

[0021] The filter disc is pivotally connected to the housing;

[0022] The slit plate is installed on the housing, and when the filter plate is rotated to the slit plate, the filter plate is parallel to the slit plate.

[0023] Furthermore, the slit sheet is connected to the shell through a bracket.

[0024] Furthermore, the filter disc is connected to a motor;

[0025] The motor is installed on the outside of the shell, and the output shaft of the motor passes through the shell and is drivingly connected with the filter disc.

[0026] Beneficial effects:

[0027] The liquid phase detector provided by the present invention includes the aforementioned filter disc. Therefore, the technical advantages and effects achieved by the liquid phase detector also include the technical advantages and effects achieved by the filter disc, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 One of the structural schematic diagrams of the filter disc provided by the embodiment of the present invention;

[0030] Figure 2 for Figure 1 A top view of the filter disc shown;

[0031] Figure 3 for Figure 1 A side view of the filter disc shown, wherein a filter is installed in some of the grooves;

[0032] Figure 4 For along Figure 3 A cross-sectional view of line AA shown;

[0033] Figure 5 A fourth structural schematic diagram of a filter disc provided in an embodiment of the present invention;

[0034] Figure 6 One of the partial structural schematic diagrams of the liquid phase detector provided by an embodiment of the present invention;

[0035] Figure 7 for Figure 6 A top view of the liquid phase detector shown;

[0036] Figure 8 for Figure 6 The front view of the filter disc, slit plate and "L" shaped bracket in the liquid phase detector is shown.

[0037] icon:

[0038] 100-rotating body; 200-filter; 300-housing; 400-slit plate; 500-"L" shaped bracket; 600-motor;

[0039] 110 - mounting hole; 111 - groove; 120 - light blocking position. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They 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", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0047] This embodiment provides a filter disc, such as Figures 1 to 4 As shown, the filter disc includes a rotating body 100 with a hollow structure; at least one end of the rotating body 100 is open; a plurality of mounting holes 110 are circumferentially provided on the side wall of the rotating body 100, the edges of the mounting holes 110 are recessed inward to form a groove 111 for mounting the filter 200, the bottom surface of the groove 111 is an inclined plane, and the inclined plane can be perpendicular to the light entering from the opening.

[0048] The filter disc provided in this embodiment, on the one hand, because the bottom surface of the groove 111 is an inclined plane, the inclined plane can be perpendicular to the light entering from the opening, so as to reduce other influences of the filter and ensure the normal propagation of the light; on the other hand, compared with the plane disc filter disc used in the prior art, on the basis of the same filter size and number, the filter disc of this embodiment can be solved by increasing the side area of ​​the rotating body 100, which has little impact on the volume of the overall optical unit, that is, the purpose of switching multiple filters can be completed in a smaller space, thereby optimizing the structure of the instrument and making it more compact and compact.

[0049] It should be noted that the function of the filter is to select optical devices with the required radiation band. If the passing light is not perpendicular to the filter, according to the law of light propagation, the passing light will be reflected and refracted. On the one hand, the refracted light changes the propagation path of the incident light, and on the other hand, the reflected light loses the energy of the incident light. Therefore, when using the filter, it should be placed vertically in the light path as much as possible to reduce other influences of the filter and ensure the normal propagation of light.

[0050] In general technology, based on the same filter size and number, the use of a flat disc filter will increase the volume and height of the optical unit, and the larger the filter used, the larger the circumference of the flat disc filter, and the larger the volume of the optical unit, which is very disadvantageous for the integration and miniaturization of the instrument. The cross-sectional shape of the groove 111 can be rectangular or circular. Since these two types of filters are relatively low in cost, they are more commonly used. In the actual processing process, the cross-sectional shape of the groove 111 can be adjusted according to the selection needs.

[0051] The cross-sectional shape of the groove 111 in the present embodiment is rectangular; during installation, the filter 200 can be fixed in the groove 111 of the filter disc using a glass bonding glue such as silicone. At this time, the surface of the filter 200 can be tightly against the inclined plane of the groove 111, making the fixation of the filter 200 more stable and secure.

[0052] Optionally, the rotating body 100 may be in various forms. For example, the outer surface of the side wall of the rotating body 100 is an inclined surface, a cylindrical surface, a conical surface, etc.

[0053] This embodiment selects the form of a conical surface. Specifically, the outer surface of the side wall of the rotating body 100 is a conical surface, and the inclined plane is a section of the conical surface. Such a configuration can simplify the processing technology of processing the groove 111 with an inclined plane on the conical surface, and compared with the cylindrical surface and the inclined surface, it can also increase the side surface area, which is convenient for the layout of multiple filters 200.

[0054] Optionally, when the outer surface of the side wall of the rotating body 100 is a conical surface, the inner surface of the side wall of the rotating body 100 may be a conical surface or a cylindrical surface.

[0055] In this embodiment, the inner surface of the side wall of the rotating body 100 is also in the form of a conical surface. Such a configuration can gradually increase the cross-sectional size of the hollow structure from the outside to the inside. Since the size of the open opening is larger, it is convenient for the light source to enter along the direction perpendicular to the inclined plane of the groove 111, and it is also convenient to find a reasonable position for arranging the light source.

[0056] Specifically, Figure 1 As shown, the rotating body 100 is a hollow truncated cone structure, and the lower bottom surface of the hollow truncated cone structure is open. Such an arrangement allows the light source light to be emitted from the lower bottom surface of the hollow truncated cone structure to the filter 200.

[0057] Please continue to refer to Figure 1, the wall thickness of the hollow truncated cone structure is equal at all places. Such a setting can ensure that when processing the mounting hole 110, the shrinkage at all places is consistent, ensuring the dimensional accuracy of the processed product. In general technology, for structures with uneven wall thickness, the shrinkage of the part with a larger wall thickness is greater than that of the part with a smaller wall thickness, and the dimensional accuracy of the processed product cannot be guaranteed, and the dimensional accuracy is poor.

[0058] It has been introduced above that the side wall of the rotating body 100 is provided with a plurality of mounting holes 110 along the circumferential direction. Next, the plurality of mounting holes 110 will be further described.

[0059] like Figure 1 , Figure 4 or Figure 5 As shown, a plurality of mounting holes 110 are spaced and evenly arranged along the circumference of the rotating body 100. Such an arrangement can determine the distance between two adjacent mounting holes 110, that is, the distance between two adjacent filters 200. When the filters 200 rotate under the drive of the power source, the angle of one rotation of the rotating body 100 can be set by the distance between the two filters 200.

[0060] Further, see Figure 4 The number of the plurality of mounting holes 110 is at least two greater than the number of the optical filters 200 to be mounted.

[0061] In this embodiment, the number of the mounting holes 110 and the angles between them are determined according to the size of the light spot passing through the filter in the specific light path, the size of the filter and the cone size of the designed rotating body 100 .

[0062] For example, the number of the plurality of mounting holes 110 in this embodiment is four, i.e., four mounting positions. In a specific configuration, one more mounting position than the four mounting holes 110 positions, i.e., five mounting positions are spaced and evenly arranged along the circumferential direction of the side wall of the rotating body 100. The circumferential angle corresponding to the two mounting positions is 72°.

[0063] Among them, refer to Figure 4 and Figure 5 Three mounting holes 110 are used to install the filter 200. For example, the wavelengths passed are 300-380nm, 380nm-600nm, and 600nm-800nm ​​respectively. The remaining mounting hole 110 is not installed with other components, and the wavelength passed is 190nm-300nm. There is also an installation position, which is a light blocking position.

[0064] In short, the filter disc has five positions, namely the first filter position, the second filter position, the third filter position, the blank position and the light blocking position 120. When the filter disc is driven by a power source to rotate a certain angle, the corresponding gear position can be turned to the corresponding position.

[0065] It should be noted that the five positions of the filter disk can be set as needed and are not limited to the above arrangement order. For example, one arrangement order may be: first filter position, blank position, second filter position, third filter position and light blocking position 120.

[0066] For example, the wavelength of the first filter can be 300nm, 310nm, 320nm, 330nm, 340nm, 350nm, 360nm, 370nm, 380nm, etc. The wavelength of the second filter can be 380nm, 400nm, 450nm, 500nm, 550nm, 600nm, etc. The wavelength of the third filter can be 600nm, 650nm, 700nm, 750nm, 800nm, etc. The wavelength of the blank position is 190nm, 200nm, 250nm, 300nm, etc.

[0067] This embodiment also provides a liquid phase detector, such as Figures 6 to 8 As shown, the liquid phase detector includes a filter 200, a housing 300, a slit plate 400 and the aforementioned filter disc; the filter 200 is installed in the groove 111; the filter disc is pivotally connected to the housing 300; the slit plate 400 is installed in the housing 300, and when the filter 200 is rotated to the slit plate 400, the filter 200 is parallel to the slit plate 400 (see Figure 8 ). The liquid phase detector provided in this embodiment includes the aforementioned filter disc. Therefore, the technical advantages and effects achieved by the liquid phase detector also include the technical advantages and effects achieved by the filter disc, which will not be repeated here.

[0068] An optical unit (not shown in the drawings) is also mounted on the housing 300 .

[0069] like Figure 6 and Figure 7 As shown, the slit sheet 400 is connected to the housing 300 through a bracket. In one embodiment of the present application, the bracket adopts an "L"-shaped bracket 500, and the slit sheet 400 is installed on the long side segment or the short side segment of the "L"-shaped bracket 500. Of course, the structural type of the bracket is not limited to the "L" shape, and can also be other structures. As long as the structural form that can meet the installation requirements of the slit sheet 400 is within the protection scope of the present invention.

[0070] In this embodiment, the housing 300 is Figure 6When placed in the state shown, the slit sheet 400 is mounted on the long side section of the "L"-shaped bracket 500 and is arranged vertically, and the short side section of the "L"-shaped bracket 500 is fixedly connected to the housing 300. The advantage of selecting the "L"-shaped bracket 500 is that it is easy to install the slit sheet 400, and at the same time, it is easy to make the installation position of the "L"-shaped bracket 500 meet the design requirement that the slit sheet 400 is parallel to the filter 200.

[0071] Optionally, the short side section of the “L”-shaped bracket 500 and the housing 300 may be detachably connected, for example, by plugging, threading, etc.

[0072] In this embodiment, the filter disc is connected to a motor 600; the motor 600 is installed outside the housing 300, and the output shaft of the motor 600 passes through the housing 300 and is in driving connection with the filter disc. Such an arrangement can further reduce the volume of the housing 300.

[0073] In the conventional technology, the volume of the planar disc filter disk in the same optical unit occupies a large space, and the volume of the housing 300 needs to be enlarged.

[0074] One test process for a liquid phase detector is:

[0075] The motor 600 rotates to drive the filter disc to rotate to a certain angle and then stops, so that the filter 200 of the required wavelength is rotated to the position of the slit plate 400, and the filter 200 is parallel to the slit plate 400;

[0076] Start the light source (not shown in the drawings), the light from the light source passes vertically toward the filter 200 and is output through the slit 400;

[0077] When it is necessary to switch to another position, the motor 600 is restarted to drive the filter disc to rotate a corresponding angle.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A filter disc, characterized in that: include: A rotating body having a hollow structure; At least one end of the rotating body is open; The side wall of the rotating body is provided with a plurality of mounting holes along the circumferential direction, the edges of the mounting holes are recessed inward to form a groove for mounting the filter, the bottom surface of the groove is an inclined plane, and the inclined plane can be perpendicular to the light entering from the opening; The outer surface of the side wall is an inclined surface, a cylindrical surface or a conical surface; When the outer surface of the side wall is a conical surface, the inclined plane is a section of the conical surface, the rotating body is a hollow truncated cone structure, and the lower bottom surface of the hollow truncated cone structure is open.

2. The filter disc according to claim 1, characterized in that: The wall thickness of the hollow truncated cone structure is equal at all locations.

3. The filter disc according to any one of claims 1 to 2, characterized in that: The plurality of mounting holes are spaced and evenly arranged along the circumference of the rotating body.

4. The filter disc according to claim 3, characterized in that: The number of the plurality of mounting holes is at least two greater than the number of filters to be mounted.

5. The filter disc according to any one of claims 1 to 2, characterized in that: The cross-sectional shape of the groove is rectangular or circular.

6. A liquid phase detector, characterized in that: A filter, a housing, a slit plate, and a filter disc as claimed in any one of claims 1 to 5; The optical filter is installed in the groove; The filter disc is pivotally connected to the housing; The slit plate is installed on the housing, and when the filter plate is rotated to the slit plate, the filter plate is parallel to the slit plate.

7. The liquid phase detector according to claim 6, characterized in that: The slit sheet is connected to the housing through a bracket.

8. The liquid phase detector according to claim 7, characterized in that: The filter disc is connected to a motor; The motor is installed on the outside of the shell, and the output shaft of the motor passes through the shell and is drivingly connected with the filter disc.

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