Sealing device of immersion type liquid nitrogen freezing grinder
By designing the composite structure combined with the upper plate and the thermal insulation layer in the liquid nitrogen frozen grinding instrument, the elastic retreat ability of the upper plate is used to solve the problem that the samples in the existing technology are difficult to maintain in the ultra -low temperature state for a long time, and the effectiveness of liquid nitrogen is achieved. Safety grinding of sealing and samples.
Patent Information
- Application Number
- CN202421060049.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Existing liquid nitrogen freezing grinders are difficult to keep the samples in ultra-low temperature for a long time, resulting in uneven grinding effects and cross-contamination with the outside world after the temperature rises.
A sealing device for an immersed liquid nitrogen freezing grinder is designed. It adopts a composite structure combining an upper pressure plate and an insulation layer. It uses the elastic retreat ability of the upper pressure plate to reduce the volatilization of liquid nitrogen, and realizes splitting through the design of the connecting shaft and spring. Effective sealing of joints.
It effectively reduces the evaporation rate of liquid nitrogen, ensures that the sample is always in liquid nitrogen, avoids cross-contamination with the outside world during the sample grinding process, and achieves a simple, safe and convenient sealing effect.
Smart Images
Figure CN222384994U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of biological test equipment, in particular to a sealing device for an immersion type liquid nitrogen freezing grinder. Background Art
[0002] In the field of biological experiments, in order to maintain the activity of biological substances, the samples must be ground at a low temperature of -196°C. This requires that the samples be completely immersed in liquid nitrogen and that the samples be completely sealed and ultra-low temperature to prevent the rapid volatilization of liquid nitrogen. This requires a liquid nitrogen sealing device. Conventional grinders and ordinary liquid nitrogen cryo-grinders cannot keep the samples in an ultra-low temperature environment for a long time, resulting in uneven grinding effects, and cross-contamination with the outside world when the temperature rises. Therefore, grinding in a closed environment with almost no leakage is effective. Utility Model Content
[0003] The problem to be solved by the utility model is to provide a sealing device for an immersed liquid nitrogen freezing grinder, and to improve the sealing of the opening and closing parts. The upper pressing plate has elastic retraction ability, which reduces the volatilization of liquid nitrogen, ensures that the sample is always immersed in liquid nitrogen during grinding, and prevents cross contamination with the outside world during the sample grinding and crushing process.
[0004] In order to solve the above problems, the utility model provides an immersion liquid nitrogen cryo-grinder sealing device. To achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:
[0005] The sealing device of an immersion liquid nitrogen cryo-grinder comprises: a liquid nitrogen basin, the opening of which is provided with an openable and closable upper cover; a grinding chamber, which is located in the liquid nitrogen basin; an upper pressing plate, the inner wall of which is provided with an upper pressing plate; a heat-insulating layer is provided between the upper cover and the upper pressing plate, a connecting shaft is vertically fixed between the upper cover and the upper pressing plate, the upper pressing plate has a linear translational freedom along the axis of the connecting shaft, the connecting shaft limits the farthest limit distance between the upper cover and the upper pressing plate, and a spring is also sleeved on the connecting shaft to allow the upper pressing plate to have a tendency to move away from the upper cover; when the upper cover and the opening of the liquid nitrogen basin are closed, the upper pressing plate covers the opening of the liquid nitrogen basin and retracts in a direction close to the upper cover.
[0006] The beneficial effect of adopting the above technical solution is that the sealing device mainly improves the sealing part of the opening and closing mechanism. The upper pressure plate has the ability of elastic retraction, which can not only prevent the liquid nitrogen from causing unnecessary harm to the human body during the working process, but also effectively reduce the volatilization rate of the liquid nitrogen in the liquid nitrogen basin, and can ensure that the sample is always completely immersed in the liquid nitrogen during grinding, eliminating the possibility of cross contamination with the outside world during the sample grinding and crushing process. It is a simple, safe and convenient sealing device.
[0007] The upper pressure plate, the thermal insulation layer and the upper cover form a sandwich-type composite thermal insulation layer structure, which has a good thermal insulation effect.
[0008] The elastic retraction of the upper pressing plate is guided by the connecting shaft, and the guiding effect is good and the elastic recovery is good, and the upper pressing plate itself does not need to have elastic deformation ability. The upper pressing plate can withstand large-value movement. Correspondingly, the elastic extrusion force between the upper pressing plate and the liquid nitrogen basin can also be very large.
[0009] As a further improvement of the utility model, the hardness of the upper pressing plate is greater than the hardness of the thermal insulation layer; the thickness of the thermal insulation layer is not greater than the minimum limit distance from the upper cover to the upper pressing plate.
[0010] The beneficial effect of adopting the above technical solution is that the thermal insulation layer does not interfere with the movement of the upper pressing plate itself.
[0011] As a further improvement of the present invention, the opening of the liquid nitrogen basin itself is provided with a circle of upwardly convex convex edge stoppers; when the upper cover and the opening of the liquid nitrogen basin itself are closed, all parts of the convex edge stoppers are in contact with the upper pressure plate.
[0012] The beneficial effects of adopting the above technical solution are: the convex edge stop ensures a circle of continuous line contact when closed to prevent liquid nitrogen from leaking, and each seal is also rated to withstand a large extrusion pressure.
[0013] As a further improvement of the utility model, the connecting shaft is further covered with a shaft sleeve, and the thermal insulation layer has a through passage for the shaft sleeve to move axially.
[0014] The beneficial effect of adopting the above technical solution is that the shaft sleeve and the through-channel can avoid the adverse effect of the insulation layer on the connecting shaft.
[0015] As a further improvement of the utility model, washers and bolts are respectively installed at both ends of the connecting shaft, the bolts are located on the side of the upper pressure plate facing the liquid nitrogen basin, and the two ends of the spring are respectively in contact with the washers and the shaft sleeve.
[0016] The beneficial effects of adopting the above technical solution are: the washers and nuts are used to fix the connecting shaft axially, and the bolts are detachable, which is convenient for the inspection and replacement of the insulation layer.
[0017] As a further improvement of the utility model, the bolts are arranged in a rectangular array on the upper pressing plate.
[0018] The beneficial effect of adopting the above technical solution is that this design makes the upper cover limited by its own size and shape.
[0019] As a further improvement of the utility model, a side of the upper pressure plate facing the thermal insulation layer is provided with convex ribs, and the thermal insulation layer has grooves for avoiding the convex ribs.
[0020] The beneficial effect of adopting the above technical solution is that the convex ribs strengthen the bending strength of the upper pressing plate.
[0021] As a further improvement of the present invention, the grinding chamber is fixed to the middle part of the upper pressing plate, and the grinding chamber is never fixed to the inner wall of the liquid nitrogen basin.
[0022] The beneficial effect of adopting the above technical solution is to ensure that the grinding chamber is surrounded by liquid nitrogen.
[0023] As a further improvement of the utility model, the liquid nitrogen basin is wrapped with a layer of nano aerogel felt.
[0024] The beneficial effect of adopting the above technical solution is that the nano aerogel felt has a good thermal insulation effect.
[0025] As a further improvement of the utility model, a base shell is further provided on the periphery of the liquid nitrogen basin, the upper cover and the base shell are hinged by hinges, a gas strut is connected between the upper cover and the base shell, and the upper cover is provided with a lock for assembly with the base shell.
[0026] The beneficial effect of adopting the above technical solution is that it facilitates the opening, closing and locking of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model in an opened state;
[0029] Figure 2 It is a longitudinal sectional view of an embodiment of the utility model in an open state;
[0030] Figure 3 It is a partial enlarged view of point A of one embodiment of the utility model;
[0031] Figure 4 It is a longitudinal sectional view of one embodiment of the utility model in a closed state;
[0032] Figure 5 It is a BB cross-sectional view of an implementation manner of the utility model.
[0033] 1-liquid nitrogen basin; 2-nano aerogel felt; 3-grinding chamber; 4-upper pressure plate; 401-convex rib; 5-upper cover; 6-insulation layer; 601-through passage; 7-connecting shaft; 8-spring; 9-gap layer; 10-sleeve; 11-gas strut; 12-washer; 13-bolt; 14-hinge; 15-lock; 16-exhaust port; 17-base shell; 18-groove; 19-convex edge stop. DETAILED DESCRIPTION
[0034] The following is a further detailed description of the present invention in conjunction with specific embodiments:
[0035] In order to achieve the purpose of the utility model, an immersion liquid nitrogen cryo-grinder sealing device comprises: a liquid nitrogen basin 1, which has an openable upper cover 5 at its opening; a grinding chamber 3, which is located in the liquid nitrogen basin 1; an upper pressing plate 4, and an upper pressing plate 4 is provided on the inner wall of the upper cover 5; an insulation layer 6 is provided between the upper cover 5 and the upper pressing plate 4, a connecting shaft 7 is vertically fixed between the upper cover 5 and the upper pressing plate 4, the upper pressing plate 4 has a linear translational freedom along the axis of the connecting shaft 7, the connecting shaft 7 limits the farthest limit distance between the upper cover 5 and the upper pressing plate 4, and a spring 8 is also sleeved on the connecting shaft 7 to allow the upper pressing plate 4 to have a movement tendency away from the upper cover 5; when the upper cover 5 and the opening of the liquid nitrogen basin 1 are closed, the upper pressing plate 4 covers the opening of the liquid nitrogen basin 1 and retracts in the direction close to the upper cover 5.
[0036] The beneficial effect of adopting the above technical solution is: the sealing device mainly improves the sealing part of the opening and closing mechanism. The upper pressure plate has the ability of elastic retraction, which can not only prevent the liquid nitrogen from causing unnecessary harm to the human body during operation, but also effectively reduce the volatilization rate of the liquid nitrogen in the liquid nitrogen basin, and can ensure that the sample is always completely immersed in liquid nitrogen during grinding, eliminating the possibility of cross contamination with the outside world during the sample grinding and crushing process. It is a simple, safe and convenient sealing device. The upper pressure plate, the insulation layer and the upper cover form a sandwich-type composite insulation layer structure with good insulation effect. The elastic retraction of the upper pressure plate is guided by the connecting shaft, which has good guiding effect and good elastic recovery, and the upper pressure plate itself does not need to have elastic deformation ability. The upper pressure plate can withstand large numerical movements. The corresponding elastic extrusion force between the upper pressure plate and the liquid nitrogen basin can also be very large.
[0037] In some other embodiments of the present invention, the hardness of the upper pressing plate 4 is greater than the hardness of the thermal insulation layer 6 ; the thickness of the thermal insulation layer 6 is not greater than the minimum limit distance from the upper cover 5 to the upper pressing plate 4 .
[0038] The beneficial effect of adopting the above technical solution is that the thermal insulation layer does not interfere with the movement of the upper pressing plate itself.
[0039] In other embodiments of the present invention, the opening of the liquid nitrogen basin 1 itself has a circle of upwardly convex convex edge stoppers 19; when the upper cover 5 and the opening of the liquid nitrogen basin 1 itself are closed, each part of the convex edge stoppers 19 is in contact with the upper pressing plate 4.
[0040] The beneficial effects of adopting the above technical solution are: the convex edge stop ensures a circle of continuous line contact when closed to prevent liquid nitrogen from leaking, and each seal is also rated to withstand a large extrusion pressure.
[0041] In other embodiments of the present invention, the connecting shaft 7 is further sleeved with a shaft sleeve 10 , and the thermal insulation layer 6 has a through passage 601 for the shaft sleeve 10 to move axially.
[0042] The beneficial effect of adopting the above technical solution is that the shaft sleeve and the through-channel can avoid the adverse effect of the insulation layer on the connecting shaft.
[0043] In other embodiments of the present invention, washers 12 and bolts 13 are respectively installed at both ends of the connecting shaft 7. The bolts 13 are located on the side of the upper pressure plate 4 facing the liquid nitrogen basin 1, and the two ends of the spring 8 are in contact with the washers 12 and the sleeves 10 respectively.
[0044] The beneficial effects of adopting the above technical solution are: the washers and nuts are used to fix the connecting shaft axially, and the bolts are detachable, which is convenient for the inspection and replacement of the insulation layer.
[0045] In some other embodiments of the present invention, the bolts 13 are arranged in a rectangular array on the upper pressing plate 4 .
[0046] The beneficial effect of adopting the above technical solution is that this design makes the upper cover limited by its own size and shape.
[0047] like Figure 3 As shown, in other embodiments of the present invention, a convex rib 401 is provided on one side of the upper pressing plate 4 facing the thermal insulation layer 6 , and the thermal insulation layer 6 has a groove 18 for avoiding the convex rib 401 .
[0048] The beneficial effect of adopting the above technical solution is that the convex ribs strengthen the bending strength of the upper pressing plate.
[0049] In some other embodiments of the present invention, the grinding chamber 3 is fixed to the middle portion of the upper pressing plate 4 , and the grinding chamber 3 is never fixed to the inner wall of the liquid nitrogen basin 1 .
[0050] The beneficial effect of adopting the above technical solution is to ensure that the grinding chamber is surrounded by liquid nitrogen.
[0051] In some other embodiments of the present invention, the liquid nitrogen basin 1 is wrapped with a layer of nano aerogel felt 2 .
[0052] The beneficial effect of adopting the above technical solution is that the nano aerogel felt has a good thermal insulation effect.
[0053] In other embodiments of the utility model, a base shell 17 is further provided on the periphery of the liquid nitrogen basin 1, the upper cover 5 and the base shell 17 are hinged by a hinge 14, a gas strut 11 is connected between the upper cover 5 and the base shell 17, and the upper cover 5 is provided with a lock 15 for assembly with the base shell 17.
[0054] The beneficial effect of adopting the above technical solution is that it facilitates the opening, closing and locking of the entire device.
[0055] The upper pressing plate 4 is also provided with an exhaust port 16 for exhausting the gas in the gap layer 9 so that the upper pressing plate 4 can be retracted.
[0056] like Figure 3 As shown, when the upper pressing plate 4 is not pressed, a gap layer 9 is formed between the upper pressing plate 4 and the thermal insulation layer 6 .
[0057] First, wrap the liquid nitrogen basin 1 around and below with nano aerogel felt 2, tie it tightly with fine steel wire or cable ties, and wrap the joints tightly with aluminum foil tape. Then install the lock buckles 15 at the junction of the shell base shell 17 and the upper cover 5 respectively, and then install six washers 12 and six connecting shafts 7 on the upper cover 5, and then install the insulation layer 6. At this time, install six springs 8 and six sleeves 10 on the connecting shafts 7 in sequence, and then install the upper pressure plate 4 on the insulation layer 6. At this time, install the gas strut 11 and hinge 14, connect the upper cover 5 with the base shell 17, and finally, install the exhaust pipe.
[0058] When in the closed and sealed state, press the upper cover 5 downward by hand until the upper pressure plate 4 contacts the upper surface of the base shell 17, and continue to press downward by hand. After the sleeve 10 touches the spring 8, the spring 8 is compressed. At this time, the upper pressure plate 4 tightly seals the top opening of the liquid nitrogen basin 1 in the middle of the base shell 17, and the insulation layer 6 is also compressed and deformed due to the downward pressure, and is tightly sealed with the base shell 17 on all sides, and then the lock buckle 15 can be locked.
[0059] The device is sealed in the middle with a stainless steel plate, which is not easy to deform. The liquid nitrogen basin is surrounded by nano-aerogel felt 2 materials for cold preservation, which greatly reduces the volatilization of liquid nitrogen. In addition, there are exhaust holes 16 on the upper pressure plate 4, and an exhaust pipe is installed at the back to prevent the excessive pressure in the cavity of the liquid nitrogen basin 1 from causing unnecessary harm to the human body. In addition, the work of the sealing device is synchronized with the upper cover 5. You only need to press the upper cover 5 downward by hand, open the lock 15, and then lift the upper cover 5 upward. With the help of the upward thrust of the gas strut 11, it can be easily opened.
[0060] In this technical solution, the grinding chamber 3 is completely immersed in a stainless steel liquid nitrogen basin 1 filled with liquid nitrogen. The grinding chamber 3 can quickly reach a liquid nitrogen temperature of -196°C during the grinding process. The liquid nitrogen basin 1 is surrounded and below with ultra-low temperature resistant nano aerogel felt 2 materials for cold preservation. The top of the liquid nitrogen basin 1 is sealed with a metal upper pressure plate 4, which can effectively prevent the large amount of liquid nitrogen from volatilizing.
[0061] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. An immersion liquid nitrogen cryo-grinder sealing device, characterized in that: include: The liquid nitrogen basin has an openable and closable upper cover at its opening; The grinding chamber is located in the liquid nitrogen basin; An upper pressing plate, the inner wall of the upper cover is provided with an upper pressing plate; an insulation layer is provided between the upper cover and the upper pressing plate, a connecting shaft is vertically fixed between the upper cover and the upper pressing plate, the upper pressing plate has a linear translation freedom along the axis of the connecting shaft itself, the connecting shaft limits the farthest limit distance between the upper cover and the upper pressing plate, and a spring is also sleeved on the connecting shaft to allow the upper pressing plate to have a tendency to move away from the upper cover; When the upper cover and the opening of the liquid nitrogen basin are closed, the upper pressing plate covers the opening of the liquid nitrogen basin and retracts toward the upper cover.
2. The sealing device for the immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The hardness of the upper pressing plate is greater than the hardness of the thermal insulation layer; the thickness of the thermal insulation layer is not greater than the minimum limit distance from the upper cover to the upper pressing plate.
3. The sealing device for the immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The opening of the liquid nitrogen basin itself is provided with a circle of upwardly convex convex edge stoppers; when the upper cover and the opening of the liquid nitrogen basin itself are closed, each part of the convex edge stoppers is in contact with the upper pressing plate.
4. The sealing device for an immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The connecting shaft is also covered with a shaft sleeve, and the thermal insulation layer is provided with a through passage for the shaft sleeve to move axially.
5. The sealing device for the immersion liquid nitrogen cryo-grinder according to claim 4, characterized in that: The two ends of the connecting shaft are also equipped with washers and bolts respectively. The bolts are located on the side of the upper pressure plate facing the liquid nitrogen basin. The two ends of the spring are in contact with the washers and the shaft sleeves respectively.
6. The sealing device for the immersion liquid nitrogen cryo-grinder according to claim 5, characterized in that: The bolts are arranged in a rectangular array on the upper pressing plate.
7. The sealing device for an immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The upper pressing plate is provided with convex ribs on one side facing the thermal insulation layer, and the thermal insulation layer is provided with grooves for avoiding the convex ribs.
8. The sealing device for an immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The grinding chamber is fixed to the middle part of the upper pressing plate, and the grinding chamber is never fixed to the inner wall of the liquid nitrogen basin.
9. The sealing device for an immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: The liquid nitrogen basin is wrapped with a layer of nano aerogel felt.
10. The sealing device for an immersion liquid nitrogen cryo-grinder according to claim 1, characterized in that: A base shell is also provided on the periphery of the liquid nitrogen basin, the upper cover and the base shell are hinged by hinges, a gas strut is connected between the upper cover and the base shell, and the upper cover is provided with a lock for assembly with the base shell.