Tablet pressing assembly and mold

Abstract

The tablet pressing assembly is used for manufacturing sheets, the sheets are used for diluting a cold disc in a refrigerating machine, the cold disc comprises a base plate, the base plate is provided with a first groove and a first via hole, the first via hole penetrates through the groove bottom wall of the first groove, the tablet pressing assembly comprises a hole pin, a first through hole and a second through hole, one end of the sheet structure extends out of the first groove, the other end of the sheet structure extends out of the first groove and is higher than the height of the material in the first groove, the sheet structure is used for temporarily blocking the first via hole to prevent the material from entering the first via hole, and a through hole communicated with the first via hole is formed in the sheet structure; and the pressing head is used for extruding the material arranged in the first groove to make a sheet structure, the outer side wall of the pressing head is matched with the inner side wall of the first groove, and the pressing head is further provided with a second via hole which is coaxial with the first via hole and has the same size as the first via hole. According to the assembly, the sheet-shaped structure of the sintered sheet before sintering can be obtained.

Description

Technical Field

[0001] The utility model belongs to the field of refrigeration technology, in particular to a tablet pressing component and a mold. Background Art

[0002] Among the existing refrigeration technologies, heat exchange technology is a more commonly used method. For example, a dilution refrigerator achieves cooling in multiple refrigeration areas by heat exchange, such as continuous heat exchangers, cold plates, sintered step heat exchangers, etc.

[0003] At extremely low temperatures, the temperature difference and interfacial thermal resistance between liquid helium and the solid surface make heat conduction between the liquid helium and solid interface difficult. In order to improve the heat exchange between the solid and liquid helium, the thermal contact area must be increased. As a component connected to the cold plate, the main function of the cold plate is to transfer its cold energy to the cold plate, which requires increasing the heat exchange area of ​​the cold plate to reduce the influence of the Kapitsa thermal resistance. In order to increase the heat exchange area of ​​the cold plate, it is necessary to prepare a sintered sheet with a larger heat exchange area on the cold plate. How to prepare a sintered sheet on the cold plate is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to realize the preparation of sheets on a cold plate. The utility model provides the following technical solutions:

[0005] On one hand, the present application provides a tablet pressing assembly for manufacturing a sheet material, wherein the sheet material is used for a cold plate in a dilution refrigerator, wherein the cold plate comprises a substrate, wherein the substrate is provided with a first groove and a first through hole, wherein the first through hole penetrates a bottom wall of the first groove, and the tablet pressing assembly comprises:

[0006] A hole pin, one end of which is detachably disposed in the first via hole, and the other end of which extends out of the first groove and is higher than the height of the material in the first groove, and is used to temporarily block the first via hole to prevent the material from entering the first via hole, and to form a through hole on the sheet structure that is conductive with the first via hole;

[0007] The pressing head is used to extrude the material arranged in the first groove to form the sheet structure. The outer wall of the pressing head matches the inner wall of the first groove, and the pressing head is also provided with a second through hole coaxial with the first through hole and of the same size.

[0008] A tablet pressing assembly as described above, further, the cold plate also includes a conduit, one end of which is located in the first through hole, and the other end extends outside the substrate; the tablet pressing assembly also includes a base, the base is provided with a main body surface, and a second groove recessed from the main body surface, the second groove is used to accommodate the other end of the conduit, and the base is used to support the substrate through the main body surface.

[0009] A tablet pressing assembly as described above further includes an outer mold, which is arranged on the first groove, and is also provided with a third through hole passing through the outer mold, the inner side wall of the third through hole is the same size as the inner side wall of the first groove, and the third through hole is coaxially arranged with the first groove.

[0010] A tablet pressing assembly as described above, further, a first positioning protrusion is provided on the surface edge of the outer mold facing the substrate, and the inner side wall of the first positioning protrusion matches the outer side wall of the substrate to constrain the relative position of the outer mold and the substrate.

[0011] The tablet pressing assembly as described above further includes a first screw group, wherein the first screw group is used to connect the outer mold and the base plate.

[0012] The tablet pressing assembly as described above further includes a second screw group, wherein the second screw group is used to connect the base and the substrate, and is staggered with the first screw group on the substrate.

[0013] In the tablet pressing assembly as described above, further, the outer mold is transparent, a scale is provided on the outer mold along the height direction, a marking point is provided on the pressing head, and the marking point is located in the third through hole before and after the material is pressed.

[0014] On the other hand, the present application provides a mold, including the above-mentioned pressing assembly, and also including a clamping plate unit, the clamping plate unit includes a first clamping plate and a second clamping plate, the pressing assembly is arranged between the first clamping plate and the second clamping plate, and at least one side of the clamping plate unit is provided with a force structure for squeezing the first clamping plate and the second clamping plate.

[0015] As described above, the mold further comprises a third groove provided at a middle position of a surface of the clamping plate unit away from the tablet pressing assembly, and the third groove is a position for applying force to the clamping plate unit.

[0016] As described above, the mold further comprises: a third screw group is provided at the edge of the first clamping plate and the second clamping plate located at the third groove; the third screw group also comprises a gasket, and the rebound of the gasket is used to offset the shrinkage of the sheet during sintering.

[0017] The beneficial effect of the utility model is that the component can realize the sheet structure of the sintered sheet before sintering, and the through holes formed on the sheet structure can provide a passage for the refrigeration fluid in the space on the sintered sheet. In addition, the hole pin also plays a limiting role on the pressure head, and the pressure head plays a guiding role in acting on the material.

[0018] The mold provided by the utility model includes the above-mentioned tablet pressing assembly, and therefore has the same beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the cold plate in the embodiment of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the tablet pressing assembly in the embodiment of the utility model.

[0021] Figure 3 It is an exploded view of the tablet pressing assembly in the embodiment of the present utility model.

[0022] Figure 4 It is a structural schematic diagram of the mold in the embodiment of the utility model.

[0023] Figure 5 It is an exploded view of the mold in the embodiment of the utility model.

[0024] In the reference numerals:

[0025] 1. cold plate; 11. base plate; 111. first groove; 112. first through hole; 12. conduit; 100. tabletting assembly; 2. pressing head; 21. second through hole; 3. outer mold; 31. third through hole; 4. base; 41. second groove; 5. hole pin; 61. first screw group; 62. second screw group; 63. third screw group; 71. first clamping plate; 72. second clamping plate; 711. third groove; 712. air vent; 81. first force-applying mechanism; 82. second force-applying mechanism. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limitations on the present application.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] like Figure 1 As shown, the cold plate 1 in the dilution refrigerator includes a base plate 11 and a conduit 12. The base plate 11 is provided with a first groove 111 and a first through hole 112. The first through hole 112 penetrates the bottom wall of the first groove 111. One end of the conduit 12 is located in the first through hole 112, and the other end extends outside the base plate 11. The first groove 111 is used to place a refrigerant fluid that reduces the temperature of the cold plate 1. In order to improve the heat exchange effect between the cold plate 1 and the refrigerant fluid, a sintered sheet is provided in the first groove 111 to increase the heat exchange area between the cold plate 1 and the refrigerant fluid.

[0030] In order to prepare the sheet material for forming the sintered sheet in the cold plate 1, as Figure 2 and Figure 3 As shown: The embodiment of the present application discloses a tablet pressing assembly 100, including a hole pin 5 and a pressing head 2. One end of the hole pin 5 is detachably arranged in the first through hole 112, and the other end extends out of the first groove 111 and is higher than the height of the material in the first groove 111, which is used to temporarily block the first through hole 112 to prevent the material from entering the first through hole 112, and form a through hole on the sheet structure that is conductive with the first through hole 112. The pressing head 2 is used to extrude the material arranged in the first groove 111 to form the sheet structure, the outer side wall of the pressing head 2 matches the inner side wall of the first groove 111, and the pressing head 2 is also provided with a second through hole 21 that is coaxial and of the same size as the first through hole 112.

[0031] Based on this assembly, one end of the hole pin 5 is first placed in the first through hole 112, and then the material for making the sheet is placed in the first groove 111, and then the material in the first groove 111 is pressed by the pressure head 2 until it is pressed into a sheet structure, wherein the material is a metal powder material. When the pressure head 2 presses the material in the first groove 111, since the hole pin 5 extends out of the first groove 111 and is higher than the height of the material, the second through hole 21 provides movement space for the pressure head 2 in the process of pressing the material. In addition, the height setting of the hole pin 5 can ensure that a through hole connected to the first through hole 112 is formed on the sheet structure, and the through hole can provide a passage for the refrigerant fluid on the sintered sheet. In addition, the hole pin 5 also plays a role in limiting and guiding the pressure head 2.

[0032] In one embodiment, the tablet pressing assembly 100 further includes a base 4, the base 4 is provided with a main body surface, and a second groove 41 recessed from the main body surface, the second groove 41 is used to accommodate the other end of the conduit 12, and the base 4 is used to support the substrate 11 through the main body surface. Since the conduit 12 partially protrudes from the lower end surface of the substrate 11, the lower end surface of the cold plate 1 is uneven. In the present application, the base 4 is provided with a second groove 41 recessed on the main body surface, and the second groove 41 can accommodate the portion of the conduit 12 located outside the substrate 11, or at least accommodate the portion of the conduit 12 perpendicular to the substrate 11, so that when the pressure head 2 applies pressure to the material in the first groove 111, the base 4 provides an upward support force for the substrate 11, thereby supporting the entire substrate 11 and all structures above it.

[0033] In one embodiment, the tablet pressing assembly further includes an outer mold 3, the outer mold 3 is arranged on the first groove 111, and a third through hole 31 penetrating the outer mold 3 is further arranged on the outer mold 3, and the inner side wall of the third through hole 31 has the same size as the inner side wall of the first groove 111 and is coaxially arranged. In this embodiment, before the material is pressed, the volume of the material is large and the material may overflow from the first groove 111. This solution sets the outer mold 3 and sets the third through hole 31 penetrating the outer mold 3 on the outer mold 3, so that the outer mold 3 is equivalent to the extension of the first groove 111 in the depth direction, thereby avoiding the overflow of the material and providing a guide groove for the pressing head 2 to extrude the material in the first groove 111.

[0034] In one of the embodiments, in order to fix the outer mold 3 and the substrate 11, a first positioning protrusion (not shown in the figure) is provided on the surface edge of the outer mold 3 facing the substrate 11, and the inner side wall of the first positioning protrusion matches the outer side wall of the substrate 11, which is used to constrain the relative position of the outer mold 3 and the substrate 11. The provision of the first positioning protrusion can constrain the relative position of the outer mold 3 and the substrate 11. Since the outer mold 3 needs to be removed from the substrate 11 after preparing the sintered sheet, this embodiment not only realizes constraining the relative position of the outer mold 3 and the substrate 11, but also facilitates the removal of the outer mold 3 from the substrate.

[0035] In another embodiment, in order to fix the outer mold 3 and the substrate 11, the tablet pressing assembly 100 further includes a first screw group 61, and the first screw group 61 is used to connect the outer mold 3 and the substrate 11. Since the substrate 11 also needs to be connected with other components when used in the dilution refrigerator, a plurality of mounting holes are provided on the substrate 11. In this embodiment, at least two corresponding mounting holes are provided on the outer mold 3, and the first screw group 61 fixes the outer mold 3 and the substrate 11 by passing through the mounting holes.

[0036] In one embodiment, in order to fix the base 4 and the substrate 11, the tablet pressing assembly 100 further includes a second screw group 62, the second screw group 62 is used to connect the base 4 and the substrate 11, and is staggered with the first screw group 61 on the substrate 11. In this embodiment, the base 4 and the substrate 11 are positioned by the second screw group 62, so that when the pressing head 2 squeezes the material in the first groove 111, there is no misalignment between the base 4 and the substrate 11. In addition, the first screw group 61 and the second screw group 62 are staggered on the substrate 11, which can ensure that the base 4 and the outer mold 3 are fixed on the substrate 11 at the same time.

[0037] In one of the embodiments, in order to ensure that the ram 2 can complete the extrusion of the material, the sum of the height of the ram 2 and the thickness of the sintered sheet is not less than the sum of the depths of the third through hole 31 and the first groove 111. In detail, the cross-sectional dimension of the ram 2 at the part away from the first groove is smaller than the cross-sectional dimension near the first groove. In one of the embodiments, the ram 2 is provided with a certain height at the part close to the first groove 111 and the dimension matches the dimension of the first groove 111, and the dimension at other positions is smaller than the dimension at the first groove 111. The part matching the dimension of the first groove 111 can also prevent the ram 2 from shaking in the first groove 111 when the extrusion of the material is completed, and the ram 2 at other positions can be used as a handle or connected to the driving structure.

[0038] In one embodiment, in order to measure the thickness of the current sheet structure, a measuring ruler is provided on the side wall of the press head 2 along the height direction, and the measuring ruler is used to measure the height of the press head 2 in the total groove, and the total groove is formed by the third via hole 31 and the first groove 111. In this embodiment, by obtaining the height of the press head 2 in the total groove, based on the known depth of the first groove 111, the pressing condition of the current sheet structure can be obtained by obtaining the relative position of the press head 2 in the third via hole 31 in real time, and providing a basis for judging whether the target thickness has been pressed.

[0039] In another embodiment, the outer mold 3 is transparent, and the pressure head 2 or the outer mold 3 is provided with a scale in the height direction, and the corresponding outer mold 3 or the pressure head 2 is provided with a marking point in the height direction. Specifically, when the scale is set on the pressure head 2, the marking point is set on the outer mold 3; when the scale is set on the outer mold 3, the marking point is set on the pressure head 2. This embodiment is based on the known depth of the first groove 111, and the corresponding position of the marking point on the scale is obtained, so as to obtain the pressing condition of the current sheet structure, and provide a basis for judging whether the target thickness has been pressed.

[0040] In a preferred embodiment, the outer mold 3 is transparent, and a scale is provided along the height direction of the outer mold 3. A marking point is provided on the pressure head 2, and the marking point is located in the third through hole 31 before and after the material is pressed. In this embodiment, since the pressure head 2 is easily deformed during multiple stamping processes, the scale located on the pressure head 2 is deformed. When the scale is set on the outer mold 3, the position of the marking point on the pressure head 2 on the scale before stamping is used as the initial value, and the position of the marking point on the scale after stamping is used as the end value. The difference between the end value and the initial value after the end is the difference in thickness of the material pressed into a sheet. It will not be affected by the deformation of the pressure head 2, and the scale on the outer mold 3 will not be subjected to force, resulting in inaccurate scale.

[0041] The working process of the tablet pressing assembly 100 corresponding to one of the above embodiments is as follows:

[0042] The outer mold 3 and the base 4 are fixed on the base plate 11 respectively;

[0043] Place one end of the hole pin 5 in the first through hole 112, and leave the other end suspended in the third through hole 31 of the outer mold 3. Since the first through hole 112 has a certain depth, the hole pin 5 will not fall over.

[0044] Put the material from the outer mold 3 into the first groove 111. When there is a lot of material, the material is distributed around the hole pin 5 in the first groove 111 and the third through hole 31.

[0045] The indenter 2 is placed in the third through hole 31, and the suspended end of the orifice pin 5 passes through the third through hole 31. The indenter 2 is placed on the material, and the thickness of the material is obtained by obtaining the position of the marking point on the scale based on the known thickness of the first groove 111;

[0046] Under the guidance and constraint of the third through hole 31 and the orifice pin 5, the pressing head 2 presses the material in the third through hole 31 and the first groove 111. By observing the position of the marking point on the scale and comparing it with the target pressing thickness of the sheet structure, it is determined in real time whether it is necessary to continue to apply pressure to change the thickness of the sheet structure.

[0047] Based on the same application concept, Figure 4 and Figure 5As shown, an embodiment of the present application also proposes a mold, including the above-mentioned tablet pressing assembly 100, and also including a clamping plate unit, the clamping plate unit including a first clamping plate 71 and a second clamping plate 72, the tablet pressing assembly 100 is arranged between the first clamping plate 71 and the second clamping plate 72, and at least one side of the clamping plate unit is provided with a force-applying structure for squeezing the first clamping plate 71 and the second clamping plate 72. The tablet pressing assembly 100 in the above scheme presses the material into a sheet structure, which is used to sinter the sheet structure in this scheme to form a sintered sheet. In this embodiment, the tablet pressing assembly 100 is placed between the first clamping plate 71 and the second clamping plate 72. During the sintering process of the sheet structure, the setting of the force-applying structure can further compress the sheet structure, and the tablet pressing assembly 100 includes a sheet structure that has been pressed to a target thickness. In addition, the present application is provided with a first force applying mechanism 81 and a second force applying mechanism 82 to squeeze the first clamping plate 71 and the second clamping plate 72 respectively, so that the force applied to the sheet structure is relatively uniform, and the sheet structure is effectively prevented from being broken during sintering and re-pressurizing.

[0048] In one embodiment, a third groove 711 is provided at the middle position of the surface of the clamping plate unit away from the tablet assembly 100 (the third groove in the second clamping plate 72 is not shown), and the third groove 711 is the position for applying force to the clamping plate unit. The third groove 711 can constrain the force application area of ​​the force application structure on the clamping plate unit, so that the applied pressure can be evenly dispersed through the clamping plate unit, preventing the deviation of the force application position from causing the sheet structure to rupture.

[0049] In one embodiment, the third groove 711 is provided with a vent hole 712 penetrating the corresponding clamping plate unit (the vent hole in the second clamping plate 72 is not shown). Since the sintering furnace chamber needs to be evacuated first and then hydrogen is introduced during sintering, the vent hole 712 is provided to facilitate the extraction of air in the tablet assembly 100 during evacuation, and hydrogen enters the gap of the tablet assembly 100 during sintering to protect the powder from oxidation. In addition, the vent hole 712 is provided to make it easier for the temperature in the sintering furnace to be transferred to the sheet structure during the sintering process.

[0050] In one of the embodiments, the first clamping plate 71 and the second clamping plate 72 are provided with a third screw group 63 at the edge of the third groove 711, which is used to tighten or maintain the distance between the first clamping plate 71 and the second clamping plate 72. It should be noted that, on this basis, the corresponding through holes at the nut ends of the first screw group 61 and the second screw group 62 are countersunk holes, so that the force of the first clamping plate 71 and the second clamping plate 72 is applied to the pressure head 2 and the base 4 on the pressing plate assembly 100. The third screw group 63 also includes a gasket. The present application offsets the shrinkage of the metal powder during sintering by the rebound of the gasket, so that the metal powder is continuously subjected to force during sintering. In this way, on the one hand, the bonding between the metal powder and the substrate is enhanced, and on the other hand, the bonding force between the metal powders is improved, so that the sintered body forms a continuous porous material, thereby improving the ability of the sintered sheet to transfer cold.

[0051] In the description of this specification, the description with reference to the terms "some embodiments" or "examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0052] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, may make any equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which shall be deemed as the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A tablet pressing assembly for manufacturing a sheet material, wherein the sheet material is used for a cold plate in a dilution refrigerator, wherein the cold plate comprises a substrate, wherein the substrate is provided with a first groove and a first through hole, wherein the first through hole penetrates the bottom wall of the first groove, wherein: The tableting assembly includes: A hole pin, one end of which is detachably disposed in the first via hole, and the other end of which extends out of the first groove and is higher than the height of the material in the first groove, and is used to temporarily block the first via hole to prevent the material from entering the first via hole, and to form a through hole on the sheet structure that is conductive with the first via hole; The pressing head is used to extrude the material arranged in the first groove to form the sheet structure. The outer wall of the pressing head matches the inner wall of the first groove, and the pressing head is also provided with a second through hole coaxial with the first through hole and of the same size.

2. A tablet pressing assembly according to claim 1, characterized in that: The cold plate also includes a conduit, one end of which is located in the first through hole and the other end extends outside the substrate; the pressing assembly also includes a base, which is provided with a main body surface and a second groove recessed from the main body surface, the second groove is used to accommodate the other end of the conduit, and the base is used to support the substrate through the main body surface.

3. A tablet pressing assembly according to claim 1 or 2, characterized in that: It also includes an outer mold, which is arranged on the first groove. The outer mold is also provided with a third through hole that passes through the outer mold. The inner side wall of the third through hole has the same size as the inner side wall of the first groove, and the third through hole is coaxially arranged with the first groove.

4. A tablet pressing assembly as claimed in claim 3, characterized in that: A first positioning protrusion is arranged on the surface edge of the outer mold facing the substrate, and the inner side wall of the first positioning protrusion matches the outer side wall of the substrate to constrain the relative position of the outer mold and the substrate.

5. A tablet pressing assembly as claimed in claim 3, characterized in that: It also includes a first screw group, which is used to connect the outer mold and the base plate.

6. A tablet pressing assembly according to claim 2, characterized in that: It also includes a second screw group, which is used to connect the base and the substrate and is staggered with the first screw group on the substrate.

7. A tablet pressing assembly according to claim 3, characterized in that: The outer mold is transparent, and a scale is arranged on the outer mold along the height direction. A marking point is arranged on the pressure head, and the marking point is located in the third through hole before and after the material is pressed.

8. A mold, characterized in that: The tablet pressing assembly comprises the tablet pressing assembly as described in any one of claims 1 to 7, and further comprises a clamping plate unit, wherein the clamping plate unit comprises a first clamping plate and a second clamping plate, the tablet pressing assembly is arranged between the first clamping plate and the second clamping plate, and at least one side of the clamping plate unit is provided with a force-applying structure for squeezing the first clamping plate and the second clamping plate.

9. A mold according to claim 8, characterized in that: A third groove is provided at a middle position of a surface of the clamping plate unit away from the pressing plate assembly, and the third groove is a position for applying force to the clamping plate unit.

10. A mold according to claim 9, characterized in that: A third screw group is arranged at the edge of the first clamping plate and the second clamping plate located at the third groove. The third screw group also includes a gasket, and the rebound of the gasket is used to offset the shrinkage of the sheet during sintering.

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