X fluorescence analyzer
By placing the X-ray tube and detector inside the measurement chamber and outside the sample in the X-ray fluorescence analyzer, and using the isolation membrane and airflow channel to purge the air gap, the problems of sample and measurement component contamination and air gap instability are solved, thereby improving measurement accuracy and signal-to-noise ratio.
Patent Information
- Application Number
- CN202423311983.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing X-ray fluorescence analyzers, the sample and measurement components are in the same analysis chamber, which makes them susceptible to contamination, leading to reduced performance, and the unstable air gap affects measurement accuracy.
The X-ray tube and detector are placed inside the measurement cavity enclosed by the housing, while the sample is placed outside and isolated by a diaphragm and a separator. An airflow channel is set up for purging to ensure a stable atmosphere, and high-purity helium or nitrogen is used to purge the air gap.
It avoids contamination of measurement components, improves measurement accuracy and signal-to-noise ratio, achieves consistency of optical path medium absorption state, and prevents contamination by external impurities.
Smart Images
Figure CN223815348U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of X fluorescence detection, in particular to an X fluorescence analyzer. BACKGROUND
[0002] Most of the existing X fluorescence analyzers generally place the measuring assembly and the sample in the same analysis chamber, but the X-ray tube or the X fluorescence detector is easily contaminated by volatile samples or dust, which causes damage and even reduces performance, and the cleaning work after contamination is difficult. If the measuring assembly and the sample are not placed in the same analysis chamber, a necessary safety air gap is left between the sample and the measuring assembly, but the safety air gap is greatly affected by the site conditions, and the atmosphere is extremely unstable, which absorbs X-rays and causes the test results to drift, resulting in poor measurement accuracy. CONTENT OF THE UTILITY MODEL
[0003] The utility model provides a kind of X fluorescence analyzer to solve the technical problem of air gap between sample and measuring assembly in prior art affecting measurement accuracy.
[0004] To achieve the above purpose, the technical scheme provided by the utility model is as follows:
[0005] The first aspect of the utility model provides an X fluorescence analyzer, which comprises a shell, an X-ray tube, a detector, a separation membrane and a separation piece. The shell encloses a measuring cavity. The X-ray tube and the detector extend into the measuring cavity. A first through hole is provided on the bottom end face of the shell to emit X-rays onto a sample. The separation membrane covers the first through hole to isolate the measuring cavity from the sample. An air gap is formed between the bottom end of the shell and the sample. The separation piece is located between the shell and the sample, and its upper end face is connected to the bottom end face of the shell. A second through hole is formed in the separation piece, which is correspondingly arranged with the first through hole to allow X-rays to pass through the separation membrane and the second through hole to irradiate the sample. An airflow channel is formed in the separation piece to introduce gas into the second through hole for purging.
[0006] Further, the X fluorescence analyzer comprises an air inlet pipe, which extends into the measuring cavity from the side face of the shell and extends out of the measuring cavity into the separation piece from the bottom end face of the shell. The air inlet pipe is in communication with the airflow channel in the separation piece, and the end of the airflow channel is in communication with the second through hole.
[0007] Further, the number of air inlet pipes is two, and the two air inlet pipes are symmetrically arranged on both sides of the separation piece. The number of airflow channels is two, and each air inlet pipe is in communication with an airflow channel.
[0008] Further, the air inlet pipe is sealingly connected with the bottom end surface of the shell.
[0009] Further, the X fluorescence analyzer comprises a silica gel pad, a groove is formed on the periphery of the first through hole on the bottom end surface of the shell, the silica gel pad is placed in the groove, and the isolation film cover is arranged on the first through hole and abuts against the silica gel pad.
[0010] Further, the isolation film is a Mylar film, and the thickness is 0.20mm-0.25mm.
[0011] Further, the isolation piece is fixedly connected with the bottom end surface of the shell through bolts.
[0012] Further, the X-ray tube and the detector are sealingly connected with the shell respectively.
[0013] Further, the X fluorescence analyzer comprises sealing rings, and the sealing rings are arranged between the X-ray tube and the shell and between the detector and the shell respectively.
[0014] Further, the X fluorescence analyzer comprises a pressure balance piston, the pressure balance piston is arranged outside the measuring cavity, and the measuring cavity is communicated with the pressure balance piston.
[0015] The X fluorescence analyzer provided by the utility model places the X-ray tube and the detector in the measuring cavity surrounded by the shell, places a sample outside the measuring cavity, and arranges a first through hole on the bottom end surface of the shell to enable X rays to irradiate on the sample from the measuring cavity; in order to separate the measuring assembly from the sample and enable the X rays to pass through, an isolation film is arranged on the first through hole. In addition, an isolation piece is arranged on the bottom end of the shell, a second through hole corresponding to the first through hole is arranged on the isolation piece, the X rays can irradiate on the sample through the second through hole, an air flow channel communicated with the second through hole is arranged in the isolation piece, and air can be introduced into the second through hole to be blown, so that the light path medium absorption state is consistent, and the measurement accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0017] Figure 1 Part of the structure of the X fluorescence analyzer in the utility model embodiment is shown in the figure.
[0018] Reference signs:
[0019] 11, measuring cavity; 12, sealing ring;
[0020] 20, X-ray tube; 30, detector;
[0021] 40, spacer; 41, second through hole; 42, air flow channel;
[0022] 50, sample; 51, air gap; 60, air inlet tube. DETAILED DESCRIPTION
[0023] In order to make the technical personnel in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0026] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly specified.
[0027] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings of the present disclosure are merely intended to facilitate the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. Therefore, any modification, change in proportion or adjustment in size that does not affect the effect and purpose of the present disclosure shall still fall within the scope of the present disclosure.
[0028] As shown in Figure 1 The X-ray fluorescence analyzer provided by the present embodiment comprises a shell, an X-ray tube 20, a detector 30, a separation film and a separation piece 40. The shell encloses a measuring cavity 11. The X-ray tube 20 and the detector 30 respectively extend into the measuring cavity 11. A first through hole is arranged on the bottom end surface of the shell to emit X-rays onto a sample 50. The separation film is arranged on the first through hole to separate the measuring cavity 11 from the sample 50. An air gap 51 is formed between the bottom end of the shell and the sample 50. The separation piece 40 is located between the shell and the sample 50, and the upper end surface of the separation piece 40 is connected to the bottom end surface of the shell. A second through hole 41 is formed on the separation piece 40, and the second through hole 41 is arranged corresponding to the first through hole to allow the X-rays to pass through the separation film and the second through hole 41 and irradiate on the sample 50. An air flow channel 42 is formed in the separation piece 40 to introduce gas into the second through hole 41 for purging.
[0029] Currently, the X-ray fluorescence analyzer generally places the scanning measurement assembly and the sample 50 in the same analysis chamber, which causes the windows of the X-ray tube 20 and the detector 30 to be contaminated, and it is very difficult to clean. If the scanning measurement assembly and the sample 50 are not placed in the same analysis chamber, the atmosphere in the air gap 51 between the scanning measurement assembly and the sample 50 is greatly affected by the site conditions, and the atmosphere is extremely unstable, which can result in poor precision of the test results.
[0030] The X-ray fluorescence analyzer of the present embodiment places the X-ray tube 20 and the detector 30 in the measuring cavity 11 enclosed by the shell, and places the sample 50 outside the measuring cavity 11. A first through hole is arranged on the bottom end surface of the shell to allow the X-rays to irradiate on the sample 50 from the measuring cavity 11. In order to separate the measurement assembly from the sample 50 and allow the X-rays to pass through, a separation film is arranged on the first through hole. In addition, a separation piece 40 is installed on the bottom end of the shell, and a second through hole 41 corresponding to the first through hole is arranged on the separation piece 40 to allow the X-rays to irradiate on the sample 50 through the second through hole 41. An air flow channel 42 communicating with the second through hole 41 is arranged in the separation piece 40 to introduce gas into the second through hole 41 for purging, thereby ensuring that the light path medium has a consistent absorption state and improving the measurement accuracy. The purging gas is selected from high-purity helium or nitrogen.
[0031] In the embodiment of the present application, the X-ray tube 20, the detector 30 and the sample 50 are not placed in the same analysis chamber, so that the problem of damage of the window of the scanning measurement assembly due to pollution is avoided. The spacer 40 is installed at the bottom end of the shell, and the purge gas is introduced into the second through hole 41 of the spacer 40 through the air flow channel 42. The air gap 51 between the scanning measurement assembly and the sample 50 is purged by the purge gas. The unstable components in the air gap 51 are removed by the purge gas, the signal-to-noise ratio of the detection is improved, and the particle deposits accumulated on the surface of the isolation film are blown away, so that the self-cleaning function of the isolation film is realized. In addition, the spacer 40 also has the functions of blocking external stray light from entering the detection light path and limiting the surface focal spot of the sample 50, and plays the role of collimation and diaphragm.
[0032] In the embodiment of the present application, the second through hole 41 on the spacer 40 is correspondingly arranged with the first through hole on the bottom end surface of the shell. The isolation film arranged on the first through hole plays the role of allowing light to pass through and isolating the sample 50 from the scanning measurement assembly. The X-ray can pass through, and the X-ray irradiates on the sample 50 through the second through hole 41. The characteristic X-ray generated by the sample 50 excited by the X-ray is reflected into the detector 30 through the second through hole 41, the first through hole and the isolation film. During detection, the isolation film can block the volatile substances or dust particles brought by the sample 50 outside the measurement area, so as to prevent the measurement assembly from being polluted.
[0033] In some embodiments, the X-ray fluorescence analyzer includes a gas inlet pipe 60. The gas inlet pipe 60 extends into the measurement cavity 11 from the side surface of the shell and extends out of the measurement cavity 11 into the spacer 40 from the bottom end surface of the shell. The gas inlet pipe 60 is in communication with the air flow channel 42 in the spacer 40, and the end of the air flow channel 42 is in communication with the second through hole 41.
[0034] In the embodiment of the present application, the gas inlet pipe 60 introduces the purge gas into the air flow channel 42, and then the purge gas is introduced into the area of the second through hole 41. Due to the structure of the spacer 40 and the space limitation between the spacer 40 and the shell, the gas inlet pipe 60 is arranged to first extend into the measurement cavity 11, and then extend into the air flow channel 42 of the spacer 40 from the measurement cavity 11. Referring to Figure 1 , a “zigzag” shaped channel is formed. The purge gas forms a purge gas flow in the air gap 51 in the area of the second through hole 41 and the vicinity thereof, so as to blow away the unstable components therein, ensure that the light path medium has the same absorption state, and improve the measurement accuracy.
[0035] Further, the number of the gas inlet pipes 60 is two, and the two gas inlet pipes 60 are symmetrically arranged on both sides of the spacer 40. The number of the air flow channels 42 is two, and each gas inlet pipe 60 is in communication with an air flow channel 42. In the embodiment of the present application, the two symmetrically arranged gas inlet pipes 60 can enhance the purging strength, and further blow away the unstable components in the air gap 51.
[0036] Further, the air inlet pipe 60 is sealingly connected with the bottom end surface of the shell. It can be understood that the sealing connection between the air inlet pipe 60 and the bottom end surface of the shell can avoid external gas from entering the measurement cavity 11 to disturb the atmosphere thereof.
[0037] In some embodiments, the X-ray fluorescence analyzer comprises a silica gel pad, a groove is formed on the periphery of the first through hole on the bottom end surface of the shell, the silica gel pad is placed in the groove, and the isolation film cover is arranged on the first through hole and abuts against the silica gel pad. In the embodiment of the present application, the silica gel pad is arranged at the position where the bottom end surface of the shell contacts the isolation film, and when the isolation piece 40 is connected with the bottom end of the shell, the silica gel pad and the isolation film can be extruded, so that the isolation film is more stably arranged on the first through hole.
[0038] Specifically, the isolation film is a Mylar film, and the thickness thereof is 0.20mm-0.25mm. In the embodiment of the present application, the Mylar film can ensure that X-ray photons of most wavelengths pass through, and can enable the characteristic X-ray backscattering generated by the sample 50 to enter the detector 30 in the measurement cavity 11; in addition, the Mylar film can also isolate volatile substances or dust particles brought by the sample 50 outside the measurement cavity 11, so as to avoid pollution of the internal scanning measurement components.
[0039] In some embodiments, the isolation piece 40 is fixedly connected with the bottom end surface of the shell by means of bolts. In the embodiment of the present application, the isolation piece 40 is effectively connected with the shell, so as to ensure that there is no gap between the two, thereby enabling the purge gas to enter the air gap 51 between the sample 50 and the shell; in addition, the air inlet pipe 60 and the airflow channel 42 in the isolation piece 40 can be smoothly communicated; and the isolation film and the silica gel pad can be extruded.
[0040] In some embodiments, the X-ray tube 20 and the detector 30 are sealingly connected with the shell. In the embodiment of the present application, O-shaped sealing rings 12 can be used to seal between the X-ray tube 20 and the shell and between the detector 30 and the shell. The inside of the measurement cavity 11 is filled with normal-pressure helium, so that the scanning measurement components work in a stable helium atmosphere, thereby reducing the failure rate of the components. Specifically, referring to Figure 1 , the X-ray fluorescence analyzer comprises sealing rings 12, which are respectively arranged between the X-ray tube 20 and the shell and between the detector 30 and the shell.
[0041] In some embodiments, the X-ray fluorescence analyzer comprises a pressure balance piston, which is arranged outside the measurement cavity 11 and in communication with the measurement cavity 11. In the embodiment of the present application, the measurement cavity 11 is communicated with the pressure balance piston outside, so as to ensure that the internal pressure of the measurement cavity 11 is always balanced with the external air pressure, thereby avoiding air from entering the measurement cavity 11 due to leakage of the internal gas of the measurement cavity 11, and forming a single atmosphere in the measurement cavity 11 to ensure reliable work of the scanning measurement components.
[0042] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An X-ray fluorescence analyzer characterized by comprising: The X fluorescence analyzer comprises a shell, an X-ray tube, a detector, a separation film and a separation piece, the shell surrounds a measuring cavity, the X-ray tube and the detector respectively extend into the measuring cavity, a first through hole is arranged on the bottom end surface of the shell to emit X-rays onto a sample, and the separation film is arranged on the first through hole to separate the measuring cavity from the sample. An air gap is formed between the bottom end of the shell and the sample, the separation piece is located between the shell and the sample and the upper end surface of the separation piece is connected with the bottom end surface of the shell, a second through hole is formed on the separation piece and corresponds to the first through hole to allow X-rays to pass through the separation film and the second through hole to irradiate the sample, and an air flow channel is formed in the separation piece to introduce gas to the second through hole for purging.
2. The x-ray fluorescence analyzer of claim 1, wherein, The X fluorescence analyzer comprises an air inlet pipe, the air inlet pipe extends into the measuring cavity from the side surface of the shell and extends out of the measuring cavity to the separation piece from the bottom end surface of the shell, the air inlet pipe communicates with the air flow channel in the separation piece, and the end of the air flow channel communicates with the second through hole.
3. The x-ray fluorescence analyzer of claim 2, wherein, The number of air inlet pipes is two, and the two air inlet pipes are symmetrically arranged on both sides of the separation piece, and the number of air flow channels is two, and each air inlet pipe communicates with an air flow channel.
4. The x-ray fluorescence analyzer of claim 2, wherein, The air inlet pipe is sealingly connected with the bottom end surface of the shell.
5. The x-ray fluorescence analyzer of claim 1, wherein, The X fluorescence analyzer comprises a silica gel pad, a groove is formed on the periphery of the first through hole on the bottom end surface of the shell, the silica gel pad is placed in the groove, and the separation film is arranged on the first through hole and abuts against the silica gel pad.
6. The x-ray fluorescence analyzer of claim 5, wherein, The separation film is a Mylar film with a thickness of 0.20mm-0.25mm.
7. The x-ray fluorescence analyzer according to any one of claims 1 to 6, characterized in that, The separation piece and the bottom end surface of the shell are fixedly connected by bolts.
8. The x-ray fluorescence analyzer according to any one of claims 1 to 6, characterized in that, The X-ray tube and the detector are respectively sealingly connected with the shell.
9. The x-ray fluorescence analyzer of claim 8, wherein, The X fluorescence analyzer comprises a sealing ring, and the sealing ring is arranged between the X-ray tube and the shell and between the detector and the shell.
10. The x-ray fluorescence analyzer according to any one of claims 1 to 6, characterized by, The X fluorescence analyzer comprises a pressure balance piston, the pressure balance piston is arranged outside the measuring cavity, and the measuring cavity communicates with the pressure balance piston.