Ultralow-temperature cold finger device of magnetic mass spectrometer
By designing a magnetic mass spectrometer ultra-low temperature cold finger device, the combination of deep-cold box and vacuum cold fingers solves the problems of high consumption and high cost in the traditional liquid nitrogen cooling method, achieving low consumption and high efficiency cooling effect, and improving analytical performance and economic benefits.
Patent Information
- Application Number
- CN202421273595.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-06-05
AI Technical Summary
Traditional spherical cold traps use liquid nitrogen to cool, resulting in high consumption, high cost, and need frequent replenishment, which brings inconvenience to users.
A magnetic mass spectrometer ultra-low temperature cold finger device is designed, including a deep-cold box and a vacuum cold finger. A refrigerator is installed inside the deep-cold box. The refrigeration tube is set inside the vacuum cold finger. The front end of the vacuum cold finger is inserted into the ion source cavity as a sensitive component to achieve contact freezing of sample molecules.
It reduces the consumption of coolant, improves cooling efficiency, reduces cost, is easy to use, and improves the analytical performance and economic benefits of special magnetic mass spectrometers.
Smart Images
Figure CN222850556U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of isotope magnetic mass spectrometers, and in particular relates to an ultra-low temperature cold finger device for a magnetic mass spectrometer. Background Art
[0002] When analyzing samples, a dedicated magnetic mass spectrometer needs to cool sensitive components to extremely low temperatures in order to freeze excess samples. The traditional cooling method is to use a spherical cold trap and add liquid nitrogen to achieve cooling. However, this method results in a large consumption of liquid nitrogen, high cost, and requires frequent replenishment, which brings inconvenience to users. Therefore, a solution of a deep cold box combined with a cold finger is proposed to replace the original spherical cold trap. Utility Model Content
[0003] In order to overcome the above-mentioned shortcomings, the inventor of the utility model has continuously reformed and innovated through long-term exploration and attempts, multiple experiments and efforts, and proposed an ultra-low temperature cold finger device for a magnetic mass spectrometer. The device can effectively solve the problems caused by the use of liquid nitrogen for cooling in traditional spherical cold traps, reduce the consumption of coolant, improve cooling efficiency, reduce costs, facilitate use, and improve the analytical performance and economic benefits of special magnetic mass spectrometers.
[0004] To achieve the above purpose, the technical solution adopted by the utility model is to provide an ultra-low temperature cold finger device for a magnetic mass spectrometer. The device comprises a deep cold box and a vacuum cold finger, a refrigerator is installed inside the deep cold box, the lower end of the cryotube is connected to the refrigerator, the cryotube is sleeved inside the vacuum cold finger, and the front end of the vacuum cold finger is inserted into the ion source cavity as a sensitive component to achieve contact freezing of sample molecules.
[0005] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, its further preferred technical scheme is: the vacuum cold finger includes a vacuum outer cavity, a vacuum inner cavity, a sealing plate, and a vacuum flange, the vacuum outer cavity is sleeved on the outside of the vacuum inner cavity, the vacuum outer cavity at the rear end of the vacuum cold finger and the vacuum inner cavity are sealed by a sealing plate, the vacuum outer cavity at the front part of the vacuum cold finger and the vacuum inner cavity are sealed by a vacuum flange, and the vacuum inner cavity extends beyond the vacuum flange to serve as a low temperature cold finger.
[0006] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is that the vacuum outer cavity is overall L-shaped after being sheathed in the vacuum inner cavity, and the low temperature cold finger is extended out of the edge of the deep cold box through the cover plate of the deep cold box.
[0007] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is: the vacuum external cavity includes a first vacuum external cavity and a second vacuum external cavity, the connection between the first vacuum external cavity and the second vacuum external cavity is cut at 45°, and the cut ends are welded and combined to form an L shape.
[0008] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is: the vacuum inner cavity includes a first vacuum inner cavity and a second vacuum inner cavity, the connection between the first vacuum inner cavity and the second vacuum inner cavity is cut at 45°, and the cut ends are welded and combined to form an L shape.
[0009] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is that the material of the vacuum cold finger is 304 stainless steel to eliminate electromagnetic influence.
[0010] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is that the front end of the freezing tube is folded in half and then installed in coordination with the low temperature cold finger.
[0011] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, its further preferred technical solution is: the deep cold box includes an insulation box and an outer box, the insulation box is assembled in the outer box and the refrigerator is assembled in the insulation box, and the cover plates of the insulation box and the outer box are integrated cover plates.
[0012] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is that the freezing tube and the vacuum cold finger are connected to the refrigerator after passing through the heat preservation working hole on the cover plate.
[0013] According to the ultra-low temperature cold finger device of a magnetic mass spectrometer described in the utility model, a further preferred technical solution is: inserting the low temperature cold finger into the instrument ion source cavity, and connecting and assembling the vacuum flange with the instrument by bolts.
[0014] Compared with the prior art, the technical solution of the utility model has the following advantages / benefits:
[0015] 1. This device reduces the consumption of coolant, reduces the coolant consumption cost and also reduces the maintenance cost.
[0016] 2. Convenient operation. The design of the deep freezer is simple to operate. There is no need to frequently add liquid nitrogen to the liquid nitrogen barrel. The purpose of freezing sample molecules can be achieved by opening the deep freezer for a long time.
[0017] 3. The vacuum chamber is pumped to a high vacuum state for heat preservation and insulation. The freezing pipe passes through the vacuum inner cavity pipeline directly to the front end of the cold finger to ensure the freezing effect of the cold finger. The refrigeration compressor performs heat exchange to ensure the ultra-low temperature output of the refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 The utility model is a structural schematic diagram of an ultra-low temperature cold finger device of a magnetic mass spectrometer.
[0020] Figure 2 The utility model is a schematic diagram of the internal structure of an ultra-low temperature cold finger device of a magnetic mass spectrometer.
[0021] Figure 3 The utility model is a structural schematic diagram of a freezing tube of an ultra-low temperature cold finger device of a magnetic mass spectrometer.
[0022] Figure 4 The utility model discloses a vacuum cold finger structure schematic diagram of an ultra-low temperature cold finger device of a magnetic mass spectrometer.
[0023] Figure 5 The utility model discloses an explosion schematic diagram of a vacuum cold finger of an ultra-low temperature cold finger device of a magnetic mass spectrometer.
[0024] The markings in the figure are: 1. deep cold box 101. insulation box 102. outer box 103. cover plate 2. vacuum cold finger 3. refrigerator 4. freezing tube 5. vacuum outer cavity 501. first vacuum outer cavity 502. second vacuum outer cavity 6. vacuum inner cavity 601. first vacuum inner cavity 602. second vacuum inner cavity 7. sealing plate 8. vacuum flange 9. low temperature cold finger. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the embodiment of the utility model is clearly and completely described below. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the detailed description of the embodiment of the utility model provided below is not intended to limit the scope of the utility model claimed for protection, but only represents the selected embodiment of the utility model.
[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in the subsequent drawings.
[0027] Example:
[0028] like Figure 1-Figure 4 As shown, a magnetic mass spectrometer ultra-low temperature cold finger device comprises a cryogenic box 1 and a vacuum cold finger 2. A refrigerator 3 is installed inside the cryogenic box 1. The lower end of a cryogenic tube 4 is connected to the refrigerator 3. The cryogenic tube 4 is sleeved inside the vacuum cold finger 2. The front end of the vacuum cold finger 2 is inserted into the ion source cavity as a sensitive component to achieve contact freezing of sample molecules.
[0029] As attached Figure 2 , Figure 3 As shown, the vacuum cold finger 2 includes a vacuum outer cavity 5, a vacuum inner cavity 6, a sealing plate 7, and a vacuum flange 8. The vacuum outer cavity 5 is mounted on the outside of the vacuum inner cavity 6. The vacuum outer cavity 5 at the rear end of the vacuum cold finger 2 and the vacuum inner cavity 6 are sealed by a sealing plate 7. The vacuum outer cavity 5 at the front of the vacuum cold finger 2 and the vacuum inner cavity 6 are sealed by a vacuum flange 8. The vacuum inner cavity 6 exceeds the vacuum flange 8 as a low-temperature cold finger 9. The various parts are combined together by laser welding. The vacuum flange 8 is sealed and connected to the ion source cavity of the equipment. The vacuum cavity is pumped to a high vacuum state by a vacuum pump for heat insulation. The freezing pipe 4 passes through the vacuum inner cavity 6 pipeline directly to the front end of the cold finger to ensure the freezing effect of the cold finger. The refrigeration compressor performs heat exchange to ensure the ultra-low temperature output of the refrigerant. The material of the low-temperature cold finger 9 is 304 stainless steel (the overall material can be made of stainless steel) to eliminate electromagnetic influence. The various parts are connected together by vacuum welding to form a highly sealed vacuum cavity environment after being connected to the instrument. The cryogenic cold finger 9 is a special structure or a component, which is the part of the inner vacuum cavity protruding from the vacuum flange 8. It will extend into another vacuum cavity to freeze the stray impurities inside it. That is, the cryogenic cold finger 9 is a part of the inner vacuum cavity and an extension of the inner vacuum cavity. Of course, when necessary, it can also be a special structure connected to the inner vacuum cavity. The shape of the cryogenic cold finger 9 can be changed according to the equipment requirements.
[0030] The vacuum outer chamber 5 is L-shaped after being mounted on the vacuum inner chamber 6 . The low-temperature cold finger 9 is extended out of the edge of the deep-freeze box 1 through the deep-freeze box cover 103 , which is convenient for installing the low-temperature cold finger 9 .
[0031] The vacuum outer cavity 5 comprises a first vacuum outer cavity 501 and a second vacuum outer cavity 502, the connection between the first vacuum outer cavity 501 and the second vacuum outer cavity 502 is cut at 45°, and the cut ends are welded to form an L shape, and the vacuum inner cavity 6 comprises a first vacuum inner cavity 601 and a second vacuum inner cavity 602, the connection between the first vacuum inner cavity 601 and the second vacuum inner cavity 602 is cut at 45°, and the cut ends are welded to form an L shape, so that an angle structure can be easily welded, and there will be no vacuum welding failure. Of course, this is only a structure of the vacuum outer cavity 5 and the vacuum inner cavity 6, and other similar structures can be adopted.
[0032] The front end of the freezing tube 4 is folded in half and then installed in coordination with the low temperature cold finger 9. The structure of the freezing tube 4 is as follows: Figure 4 As shown, the material selected is copper material with good thermal conductivity. The front end size structure in contact with the cold finger is designed according to the cold finger structure, and the front end structure is designed as a surrounding ring to increase the contact area to ensure the refrigeration effect. The freezing tube 4 is a tube, and the refrigeration liquid circulates in the freezing tube 4.
[0033] The cryogenic box 1 includes an insulation box 101 and an outer box 102. The insulation box 101 is assembled in the outer box 102 and the refrigerator 3 is assembled in the insulation box 101. The cover plate 103 of the insulation box 101 and the outer box 102 is an integrated cover plate 103, that is, the cover plate 103 is a plate in which a layer of insulation box 101 and a layer of outer box 102 are stacked together. The cover plate 103 can be set to be movably connected for easy opening of the cover for maintenance.
[0034] The freezing tube 4 and the vacuum cold finger 2 are connected to the refrigerator 3 after passing through the insulation working hole on the cover plate 103, the low-temperature cold finger 9 is inserted into the instrument ion source cavity, and the vacuum flange 8 is connected and assembled to the instrument by bolts. The working hole should be as close as possible to ensure the insulation effect.
[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between 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.
[0037] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A ultra-low temperature cold finger device for a magnetic mass spectrometer, characterized in that: It includes a deep freezing box and a vacuum cold finger. A refrigerator is installed inside the deep freezing box. The lower end of the freezing tube is connected to the refrigerator. The freezing tube is set inside the vacuum cold finger. The front end of the vacuum cold finger is inserted into the ion source cavity as a sensitive component to achieve contact freezing of sample molecules.
2. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 1, characterized in that: The vacuum cold finger includes a vacuum outer cavity, a vacuum inner cavity, a sealing plate, and a vacuum flange. The vacuum outer cavity is mounted on the outside of the vacuum inner cavity. The vacuum outer cavity at the rear end of the vacuum cold finger and the vacuum inner cavity are sealed by the sealing plate. The vacuum outer cavity at the front end of the vacuum cold finger and the vacuum inner cavity are sealed by the vacuum flange. The vacuum inner cavity extends beyond the vacuum flange to serve as a low-temperature cold finger.
3. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 2, characterized in that: The vacuum outer cavity is overall L-shaped after being covered with the vacuum inner cavity, and the low-temperature cold finger is extended out of the edge of the deep cold box through the deep cold box cover.
4. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 2, characterized in that: The vacuum outer chamber comprises a first vacuum outer chamber and a second vacuum outer chamber. The connection between the first vacuum outer chamber and the second vacuum outer chamber is cut at 45 degrees, and the cut ends are welded and combined to form an L shape.
5. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 3 or 4, characterized in that: The vacuum cavity comprises a first vacuum cavity and a second vacuum cavity. The connection between the first vacuum cavity and the second vacuum cavity is cut at 45 degrees, and the cut ends are welded and combined to form an L shape.
6. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 4, characterized in that: The material of the vacuum cold finger is 304 stainless steel to eliminate electromagnetic influence.
7. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 1, characterized in that: The front end of the freezing tube is folded in half and then installed in coordination with the low-temperature cold finger.
8. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 1, characterized in that: The deep freezer comprises an insulation box and an outer box, the insulation box is assembled in the outer box and the refrigerator is assembled in the insulation box, and the cover plates of the insulation box and the outer box are integrated cover plates.
9. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 1, characterized in that: The freezing tube and the vacuum cold finger are connected to the refrigerator after passing through the heat preservation working hole on the cover plate.
10. The ultra-low temperature cold finger device of a magnetic mass spectrometer according to claim 1, characterized in that: Insert the cryogenic cold finger into the ion source chamber of the instrument, and connect and assemble the vacuum flange to the instrument with bolts.