Vacuum outer barrel for dilution refrigerator and refrigeration equipment

Abstract

The utility model provides a vacuum outer barrel for a dilution refrigerating machine and refrigerating equipment, and the vacuum outer barrel for the dilution refrigerating machine comprises a top plate which is suspended on an external structural member; the barrel body is suitable for being assembled on the top plate, and a sealing cavity isolated from the external air environment is defined between the barrel body and the top plate; the detection part is in communication connection with an external vacuum pump, and the vacuum pump is communicated with the sealing cavity; wherein the outer edge of one of the top plate and the barrel body is provided with a shoulder part, the inner edge of the shoulder part is provided with a sliding groove in the circumferential direction, the shoulder part is further provided with at least two notches which are arranged at intervals and communicated with the sliding groove, the other one of the top plate and the barrel body is provided with a protruding edge protruding outwards in the radial direction, and the protruding edge is provided with protruding parts corresponding to the notches. The detection piece responds to the triggering position where the protruding part and the notch are staggered and located in the sliding groove and outputs a control signal to the vacuum pump so that the sealing cavity can be pumped to be in a vacuum state.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a vacuum outer barrel for a dilution refrigerator and refrigeration equipment. Background Art

[0002] The dilution refrigerator is a millikelvin-class refrigeration device that uses a mixture of helium-3 and helium-4 for a dilution refrigeration cycle. In order to achieve an extremely low working temperature, it needs to be placed in a vacuum outer barrel, and the sealed cavity of the vacuum outer barrel must be evacuated to a vacuum state to reduce the loss of cold caused by heat conduction.

[0003] Based on the special usage scenario of the dilution refrigerator, the dilution refrigerator and the vacuum outer barrel are often suspended on external structural parts. In this way, the mechanical vibration of other external equipment connected to the dilution refrigerator can be more effectively reduced and / or isolated, the leakage risk of the high-pressure refrigerator inside it can be reduced (such as allowing the refrigerant to flow naturally to the ground instead of spreading along other equipment), and heat conduction can be further reduced.

[0004] At present, the vacuum outer barrel mainly includes a top plate and a barrel body, and the top plate and the barrel body are mostly connected by a flange. Based on the above-mentioned suspended installation method, when assembling or disassembling the barrel body and the top plate, they need to be lifted by external lifting equipment, and then manually assemble multiple screw structures around the flange, which is a cumbersome operation.

[0005] Therefore, how to provide a vacuum outer barrel and refrigeration equipment for a dilution refrigerator that is easy to disassemble and assemble has become a technical problem that needs to be solved urgently. Utility Model Content

[0006] In order to solve at least one of the above and other technical problems in the prior art, the utility model provides a vacuum outer barrel for a dilution refrigerator and a refrigeration device.

[0007] An embodiment of the utility model provides a vacuum outer barrel for a dilution refrigerator, comprising: a top plate, which is suspended on an external structural member; a barrel body, which is suitable for being assembled on the top plate, and a sealed chamber isolated from an external air environment is defined between the barrel body and the top plate; and a detection member, which is communicatively connected to an external vacuum pump, and the vacuum pump is connected to the sealed chamber; wherein a shoulder is provided on the outer edge of one of the top plate and the barrel body, a slide groove is provided on the inner edge of the shoulder along the circumferential direction, and at least two notches connected to the slide groove are also provided on the shoulder, which are arranged at intervals, and the other of the top plate and the barrel body is provided with a convex edge protruding radially outward, and a protrusion corresponding to the notch is provided on the convex edge, and the detection member outputs a control signal to the vacuum pump in response to a trigger position where the protrusion is misaligned with the notch and is located in the slide groove, so that the sealed chamber is evacuated to a vacuum state.

[0008] According to an embodiment of the utility model, the shoulder is arranged on the top plate, and the convex edge is arranged at the opening position of the barrel body.

[0009] According to an embodiment of the utility model, the detection member is arranged on the top plate, the detection member is penetrated through the top plate, and the detection end of the detection member is arranged facing the slide groove.

[0010] According to an embodiment of the utility model, a suction port connected to the vacuum pump is provided on the top plate.

[0011] According to an embodiment of the utility model, the vacuum outer barrel for the dilution refrigerator further comprises a positioning member, which is arranged on the shoulder and protrudes from the shoulder to a side facing the convex edge.

[0012] According to an embodiment of the utility model, a waist-shaped hole corresponding to the above-mentioned positioning piece is arranged on the above-mentioned convex edge, and the width of the first end of the above-mentioned waist-shaped hole in the long direction is greater than the width of the second end in the long direction; wherein, a convex head is arranged at the end of the above-mentioned positioning piece away from the above-mentioned shoulder, and the width of the above-mentioned convex head is smaller than the width of the first end of the above-mentioned waist-shaped hole, and greater than the width of the second end of the above-mentioned waist-shaped hole.

[0013] According to an embodiment of the utility model, the vacuum outer barrel for the dilution refrigerator further comprises a sealing member disposed between the top plate and the barrel body, which is suitable for sealing the sealing cavity.

[0014] According to an embodiment of the utility model, the vacuum outer barrel for the dilution refrigerator further comprises a fixing member penetrating between the shoulder and the flange, which is suitable for fixing the barrel body and the top plate.

[0015] According to an embodiment of the utility model, the vacuum outer barrel for the dilution refrigerator further comprises a handle arranged on the outer end surface of the barrel body.

[0016] The embodiment of the utility model also provides a refrigeration device, including a mounting frame; a vacuum outer barrel for a dilution refrigerator, the vacuum outer barrel for the dilution refrigerator being suspended on the mounting frame; and a dilution refrigerator, which is mounted in a sealed cavity of the vacuum outer barrel for the dilution refrigerator.

[0017] According to the vacuum outer barrel and refrigeration equipment for the dilution refrigerator provided by the utility model, the shoulders and convex edges respectively arranged on the top plate and the barrel body can be assembled by means of interlocking and sliding when the top plate and the barrel body are disassembled and assembled, which is a simple assembly method and can reduce the screw structure required for sealing. When the detection component detects in real time that the top plate and the barrel body are assembled in place, a control signal is triggered to make the external vacuum pump draw the sealing cavity into a vacuum state, so that the barrel body is adsorbed on the top plate under the action of the external atmospheric pressure, so as to facilitate the subsequent installation of a small number of fixing parts (such as screw structures). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional diagram of a vacuum outer barrel for a dilution refrigerator according to an exemplary embodiment of the utility model, viewed from above;

[0019] Figure 2 yes Figure 1 A perspective view of the illustrated exemplary embodiment from a bottom perspective;

[0020] Figure 3 yes Figure 2 A partial enlarged view of section A of the illustrated exemplary embodiment;

[0021] Figure 4 is a bottom-up perspective view of another exemplary embodiment showing a fixing member;

[0022] Figure 5 yes Figure 1 A partial enlarged view of the opening portion of the barrel body of the exemplary embodiment shown.

[0023] In the drawings, the meanings of the reference numerals are as follows:

[0024] 1. Top plate;

[0025] 11. Air extraction port;

[0026] 12. Gap;

[0027] 13. Chute;

[0028] 14. Positioning parts;

[0029] 2. Barrel body;

[0030] 21. convex edge;

[0031] 22. Fixing parts;

[0032] 23. protrusion;

[0033] 231, chamfer section;

[0034] 24. Waist-shaped hole;

[0035] 25. Annular groove;

[0036] 3. handles; and

[0037] 4. Inspection pieces. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0039] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0040] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0041] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0042] Dilution refrigerator is a millikelvin-class refrigeration equipment that uses a mixture of helium-3 and helium-4 for dilution refrigeration cycle. Under the temperature condition of 0.86K, helium-3 and helium-4 will separate into two phases, of which the concentrated phase located in the upper layer mainly includes helium-3, and the dilute phase located in the lower layer is a mixture of helium-3 and helium-4. During the dilution refrigeration process, the pump group is suitable for pumping helium-3 in the dilute phase to the room temperature gas circuit circulation and returning to the concentrated phase. Since the mixed liquid needs to maintain chemical potential equilibrium, the helium-3 atoms in the concentrated phase will enter the dilute phase and absorb heat in the process, so that the dilution refrigerator has a refrigeration effect.

[0043] Due to the special use scenario of the dilution refrigerator at extremely low temperatures, the dilution refrigerator and the vacuum outer barrel are often suspended on external structural parts. Based on the above-mentioned suspended installation method, when assembling the barrel body and the top plate of the vacuum outer barrel for the dilution refrigerator, it is necessary to lift it up through external lifting equipment, and then manually assemble the multiple screw structures around the flange, which is cumbersome.

[0044] Therefore, how to provide a vacuum outer barrel and refrigeration equipment for a dilution refrigerator that is easy to disassemble and assemble has become a technical problem that needs to be solved urgently.

[0045] Figure 1 It is a three-dimensional diagram from a top view of a vacuum outer barrel for a dilution refrigerator according to an illustrative embodiment of the utility model.

[0046] According to the vacuum outer barrel (i.e., OVC barrel) for a dilution refrigerator provided by the utility model, Figure 1 As shown, it includes a top plate 1, a barrel body 2 and a detection member 4. The top plate 1 is suspended on an external structural member. The barrel body 2 is suitable for being assembled on the top plate 1, and a sealed cavity isolated from the external air environment is defined between the barrel body 2 and the top plate 1. The detection member 4 is connected to an external vacuum pump in communication, and the vacuum pump is connected to the sealed cavity. Among them, the outer edge of one of the top plate 1 and the barrel body 2 is provided with a shoulder, the inner edge of the shoulder is provided with a slide groove 13 along the circumferential direction, and at least two notches 12 connected to the slide groove 13 are also provided on the shoulder. The other of the top plate 1 and the barrel body 2 is provided with a convex edge 21 protruding radially outward, and the convex edge 21 is provided with a protrusion 23 corresponding to the notch 12. The detection member 4 responds to the trigger position where the protrusion 23 is misaligned with the notch 12 and is located in the slide groove 13, and outputs a control signal to the vacuum pump (not shown in the figure) so that the sealed cavity is evacuated to a vacuum state.

[0047] In an illustrative embodiment, Figure 1 As shown, the top plate 1 includes but is not limited to being configured as a disc structure. In detail, the top plate 1 can be mounted on an external structural member (not shown in the figure, such as a mounting frame) by a screw structure to be suspended on a working surface (such as the ground).

[0048] In an illustrative embodiment, Figure 1 As shown, the barrel body 2 is adapted to the shape of the top plate 1, including but not limited to a barrel structure configured as a cylindrical shape. In detail, the barrel body 2 has a cylindrical hollow barrel plate, and a bottom plate installed at the bottom of the barrel plate. Among them, the barrel plate and the bottom plate include but are not limited to connections sealed by welding, riveting, screw connection, integral manufacturing or any other means. That is, the barrel body 2 can only be connected to the external air environment through the opening formed by the above-mentioned barrel body 2. It should be understood that the embodiments of the utility model are not limited to this.

[0049] For example, the top plate 1 and the barrel body 2 may also be configured into other shapes and / or body structures.

[0050] According to the embodiments of the present utility model, Figure 1 As shown, the vacuum outer barrel for the dilution refrigerator further includes a handle 3 arranged on the outer end surface of the barrel body 2.

[0051] In an illustrative embodiment, Figure 1As shown, a plurality of handles 3 are provided on the outer end surface of the barrel body 2. In detail, the plurality of handles 3 are evenly spaced along the circumference of the outer end surface of the barrel body 2 so as to be held by the operator, and in the held state, the barrel body 2 is rotated relative to the top plate 1 around the axis of the barrel body 2 and the top plate 1, so that the protrusion 23 is rotated from the first position located in the notch 12 to the second position misaligned with the notch 12 and located in the slide groove 13, so as to keep the barrel body 2 on the top plate 1; in this process, the protrusion 23 is detected by the detection end of the detection member 4, so that the detection member 4 outputs a control signal (such as an electrical signal) to the vacuum pump.

[0052] In an illustrative embodiment, the number of handles 3 includes but is not limited to 2, 3, 4, 5, 6 and any other number, so as to be suitable for the outer diameter and / or circumference of the barrel 2 and to meet the grip and force application of the operator. It should be understood that the embodiments of the present utility model are not limited thereto.

[0053] For example, a plurality of handles 3 may also be arranged axially along the outer end surface of the barrel body 2, so that the operator has at least two different gripping positions in the axial direction of the barrel body 2, thereby facilitating lifting and rotation.

[0054] In a preferred embodiment, the handle 3 includes but is not limited to the following Figure 1 The horizontal handle shown. In detail, a plurality of mounting seats are evenly spaced in the circumferential direction of the outer end surface of the barrel body 2, and an arc groove is formed on the side of the mounting seat facing the barrel body 2, and the arc groove is adapted to the curvature of the outer end surface of the barrel body 2 so as to fit with the outer end surface of the barrel body 2. Furthermore, a horizontal handle is pivotally mounted on each mounting seat, and the horizontal handle can be unfolded in a substantially horizontal direction in response to the force applied by the operator when being held by the operator, so that the operator can hold and drive the barrel body 2 to rotate relative to the top plate 1, and when the barrel body 2 and the top plate 1 are assembled, the horizontal handle can swing downward under the action of its own weight and hang down in a direction substantially parallel to the axial direction of the barrel body 2, thereby reducing the unfolded area of ​​the handle 3 protruding in the radial direction of the barrel body 2.

[0055] In such an embodiment, the assembly and disassembly of the top plate 1 and the barrel body 2 can be realized by the cooperation of the shoulders and the convex edges 21 respectively provided on the top plate 1 and the barrel body 2. The protrusion 23 can be moved between the first position located in the notch 12 and the disengagement position located outside the notch 12 in the vertical direction by lifting by human and / or external lifting equipment (such as a lifting vehicle, a forklift, etc.); when the protrusion 23 is in the first position, the operator only needs to hold the handle 3 to rotate the barrel body 2 relative to the top plate 1, so that the protrusion 23 can be embedded in the slide groove 13 formed by the shoulder. In this way, the barrel body 2 and the top plate 1 are initially connected, and the detection member 4 is triggered, and then the air in the sealed cavity is extracted by the vacuum pump; as the pressure difference between the internal and external pressures of the sealed cavity gradually increases, when the pressure difference between the internal and external pressures of the sealed cavity is greater than (especially much greater than) the self-weight of the barrel body 2, the barrel body 2 can be firmly adsorbed on the top plate 1. During this process, the operator only needs to fix the barrel body 2 and the top plate 1 by a small number of fixing parts and / or positioning parts (such as screw structures) to maintain the sealing between the barrel body 2 and the top plate 1. In addition, since part of the assembly process of the operator is carried out simultaneously with the vacuum extraction process, it can also save the steps required for assembly and shorten the time required for assembly (and the overall process of assembly and vacuum extraction).

[0056] Figure 2 yes Figure 1 The illustrated exemplary embodiment is a perspective view from below. Figure 3 yes Figure 2 A partial enlarged view of portion A of the exemplary embodiment shown.

[0057] According to the embodiments of the present utility model, Figure 2 and Figure 3 As shown, a shoulder is provided on the top plate 1 , and a convex edge 21 is provided at the opening position of the barrel body 2 .

[0058] In an illustrative embodiment, Figure 2 and Figure 3 As shown, the outer edge of the top plate 1 is provided with a shoulder protruding outward. In detail, the lower end of the shoulder is provided with a plurality of notches 12 opening downward at even intervals along the circumferential direction. Furthermore, the inner edge of the shoulder is provided with a chute 13 unidirectionally along the circumferential direction from the position where the notch 12 is provided, and the length of each chute 13 is configured to be substantially the same. That is, the plurality of chute 13 are intermittent and extend in the same direction (e.g., extending from the notch 12 in a clockwise or counterclockwise direction).

[0059] In an illustrative embodiment, Figure 2 and Figure 3As shown, the opening position of the barrel body 2 (i.e., the upper end of the barrel body 2) is provided with a flange 21 protruding radially outward. In detail, the outer diameter of the flange 21 should be configured to be smaller than the inner diameter of the shoulder provided on the top plate 1. Further, a protrusion 23 is provided at a position on the flange 21 corresponding to the notch 12 formed by the shoulder (i.e., in the state of being in the first position, in the orthographic projection along the axial direction of the barrel body 2, the projection of the protrusion 23 formed by the flange 21 coincides with the projection of the notch 12 formed by the shoulder), and the width of the protrusion 23 (i.e., the distance between the two ends of the protrusion along the radial direction of the barrel body 2) should be configured to be substantially the same as the groove depth of the slide groove 13 formed by the shoulder.

[0060] In an illustrative embodiment, Figure 2 and Figure 3 As shown, the protrusion 23 is integrally formed on the outer side of the convex edge 21 and forms an arc-shaped block structure. Further, the end of the protrusion 23 facing the slide groove 13 (such as Figure 3 The right end shown in FIG. 1 is formed into a chamfered section 231, and the thickness of the chamfered section 231 is configured to be smaller than that of other parts of the protrusion 23 (such as Figure 3 The thickness of the chamfered section 231 is less than the left end of the protrusion 23 shown in the figure, and is less than the groove width of the chute 13 (preferably, the groove width of the chute 13 should be configured to be substantially the same as the thickness of the main part of the protrusion 23). The chamfer formed by the chamfered section 231 includes but is not limited to being configured to be 30°. Furthermore, a concave portion with a gradually narrowing width is also provided in the portion of the chute 13 corresponding to the chamfered section 231 formed by the protrusion 23, so that when the protrusion 23 is assembled in the chute 13, it forms a concave-convex fit with the chamfered section 231 for position limiting.

[0061] In an illustrative embodiment, Figure 2 and Figure 3 As shown, the number of the notch 12 formed by the shoulder and / or the protrusion 23 formed by the convex edge 21 includes but is not limited to 4. It should be understood that the embodiments of the present utility model are not limited thereto.

[0062] For example, the number of the notches 12 formed by the shoulder and / or the protrusions 23 formed by the ridge 21 can be configured to be 2, 3, 5, 6 or any other number.

[0063] For another example, similar to the above embodiment, a shoulder may be formed at the opening of the barrel body 2 , and the flange 21 may be correspondingly disposed on the top plate 1 .

[0064] In such an embodiment, when the barrel body 2 is raised or lowered, the protrusion 23 can be moved more accurately between a first position located inside the notch 12 and a disengaged position located outside the notch 12, and when in the first position, it is accurately guided into the slide groove 13 by the narrower chamfered section 231 to rotate to the second position engaged with the slide groove 13, so that the barrel body 2 and the top plate 1 are coaxially limited and connected.

[0065] According to the embodiments of the present utility model, Figure 2 and Figure 3 As shown, the detection member 4 is arranged on the top plate 1. In detail, the detection member 4 is penetrated on the top plate 1, and the detection end of the detection member 4 is arranged to face the slide groove 13.

[0066] In an illustrative embodiment, Figures 1 to 3 As shown, a through hole is provided on the top plate 1 and penetrates in the thickness direction. Specifically, the detection end of the detection member 4 is inserted into the through hole. Furthermore, in order to maintain the sealing of the top plate 1, a corresponding sealing material should be provided between the detection member 4 and the inner edge of the through hole to prevent gas from leaking into the sealed cavity.

[0067] In a preferred embodiment, the detection member 4 includes but is not limited to a proximity switch. In detail, the proximity switch includes but is not limited to any one of an inductive, capacitive, infrared and ultrasonic type. Accordingly, the protrusion 23 should be configured to be suitable for the material and structure detected by the detection member 4. Among them, the detection end of the proximity switch can be configured to be roughly flush with the bottom surface of the top plate 1, that is, the detection end of the proximity switch is arranged in the through hole to prevent the proximity switch from hindering the rotation of the protrusion 23 along the slide groove 13. It should be understood that the embodiments of the utility model are not limited to this.

[0068] For example, the detection end of the proximity switch may protrude from the bottom surface of the top plate 1 , and accordingly, a groove structure suitable for accommodating the protruding detection end is provided on the protruding portion 23 to prevent the proximity switch from hindering the sliding of the protruding portion 23 .

[0069] Alternatively, the detection member 4 may adopt other detection devices, such as a photoelectric sensor, a displacement sensor or other devices suitable for sensing the position change of the protrusion 23 .

[0070] For another example, the detection member 4 can be constructed in multiple numbers, such as arranged in pairs, and the detection members 4 in each pair detect the position changes of at least two protrusions 23, and one of them can serve as a redundancy for the other.

[0071] For another example, the position changes of different protrusions 23 can be detected by multiple detection parts 4 to determine the synchronization and / or consistency of the cooperation between the protrusion 23 and the slide groove 13, and the sealing of the top plate 1 and the barrel body 2 can be obtained based on the above synchronization and / or consistency (such as detecting the position of the protrusion 23 in the slide groove 13 to obtain whether each protrusion 23 is located in the same plane, so as to determine whether the protrusion 23 is worn and uneven, or whether local leakage occurs).

[0072] According to the embodiments of the present utility model, Figure 2 and Figure 3 As shown, the top plate 1 is provided with an air suction port 11 connected to a vacuum pump.

[0073] In an illustrative embodiment, Figure 1 As shown, the air suction port 11 includes but is not limited to being arranged in the middle of the top surface of the top plate 1. In detail, the air suction port 11 protrudes from the top surface of the top plate 1 and is pre-installed on an external structural member (such as a mounting frame) and is connected to an external vacuum pump.

[0074] According to the embodiments of the present utility model, Figure 3 As shown, the vacuum outer barrel for the dilution refrigerator further includes a positioning member 14 , which is disposed on the shoulder and protrudes from the shoulder toward the side facing the convex edge 21 .

[0075] According to the embodiments of the present utility model, Figure 3 As shown, the convex edge 21 is provided with a waist-shaped hole 24 corresponding to the positioning member 14, and the width of the first end of the waist-shaped hole 24 in the long direction is greater than the width of the second end in the long direction. Among them, the positioning member 14 is provided with a convex head at one end away from the shoulder, and the width of the convex head is smaller than the width of the first end of the waist-shaped hole 24, and greater than the width of the second end of the waist-shaped hole 24.

[0076] In an illustrative embodiment, Figure 3 As shown, a plurality of positioning members 14 are evenly spaced along the circumference of the shoulder. Further, a waist-shaped hole 24 is provided at a position on the flange 21 corresponding to the positioning member 14 (i.e., in the orthographic projection along the axial direction of the barrel body 2, the projection of the positioning member 14 coincides with the projection of the first end (i.e., the end with a larger inner diameter) of the waist-shaped hole 24, and the second end (i.e., the end with a smaller inner diameter) of the waist-shaped hole 24 is provided on the flange 21 extending in the same direction as the extension direction of the chute 13).

[0077] In an illustrative embodiment, Figure 3 As shown, the positioning member 14 includes but is not limited to a screw. In detail, the screw shaft portion of the screw is pre-installed on the top plate 1. Further, the screw head of the screw protrudes downward from the top plate 1.

[0078] In such an embodiment, when the barrel body 2 is lifted, the handle 3 can be manually held to make a preliminary adjustment of the barrel body 2 relative to the top plate 1 until each positioning member 14 protrudes from the waist-shaped hole 24 formed by the convex edge 21, thereby confirming the position of the protrusion 23 relative to the notch 12, so that the protrusion 23 is now in the first position located in the notch 12. Afterwards, the barrel body 1 is manually rotated relative to the top plate 1, so that the protrusion 23 can be rotated to the second position tightly fitted with the slide groove 13, and the detection member 4 is triggered to generate a control signal (such as an electrical signal). After the vacuum pump draws the barrel body 2 to a vacuum state, the positioning member 14 can be further tightened, that is, the convex head (such as the screw head of a screw) of the positioning member 14 is pressed against the convex edge 21, thereby achieving the fixing and sealing of the barrel body 2 relative to the top plate 1.

[0079] Figure 4 is a bottom-up perspective view of another exemplary embodiment showing a fixing member.

[0080] According to the embodiments of the present utility model, Figure 4 As shown, the vacuum outer barrel for the dilution refrigerator further includes a fixing member 22 penetrating between the shoulder and the flange 21 , which is suitable for fixing the barrel body 2 and the top plate 1 .

[0081] In an exemplary embodiment, the fixing member 22 includes but is not limited to a screw structure. In a preferred embodiment, the screw includes but is not limited to an M8*30 hexagon socket head screw, and the screw head of the screw includes but is not limited to extending to 13 mm below the bottom surface of the top plate 1, so as to pass through the flange 21 and be pressed against the bottom surface of the flange 21.

[0082] In this way, after the barrel body 2 and the top plate 1 are positioned and vacuum is drawn (such as during the vacuum drawing process, or after the vacuum drawing process is completed), the barrel body and the top plate 1 can be fixed by the fixing member 22 to maintain the sealing of the vacuum outer barrel for the dilution refrigerator.

[0083] In an illustrative embodiment, Figure 4 As shown, the fixing member 22 and the positioning member 14 can be used in combination, that is, the barrel body 2 and the top plate 1 are assembled by the positioning member 14, and then the positioning member 14 and the fixing member 22 are respectively locked and fixed, so that the vacuum outer barrel can have a better sealing effect. It should be understood that the embodiments of the utility model are not limited to this.

[0084] In a preferred embodiment, reference may be made to Figure 3As shown, the fixing member 22 can be replaced by the positioning member 14, that is, the positioning member 14 also has the function of the fixing member 22. For example, when the positioning member 14 is at the first end (i.e., the end with a larger inner diameter) of the waist-shaped hole 24, it is suitable for positioning the top plate 1 (including the shoulder) and the barrel body 2 (including the convex edge 21) so that the top plate 1 and the barrel body 2 are coaxially engaged; in response to the rotation of the barrel body 2 relative to the top plate 1, the convex head (such as the screw head of a nut or a screw) of the positioning member 14 is located in the second end (i.e., the end with a smaller inner diameter) of the waist-shaped hole 24. On this basis, the positioning member 14 can be tightened so that the convex head (such as the screw head of a nut or a screw) is pressed against the convex edge 21 of the barrel body 2, thereby fixing and sealing the barrel body 2 and the top plate 1. In this way, the fixing member 22 can be further omitted, so that the assembly of the vacuum outer barrel for the dilution refrigerator is more convenient.

[0085] Figure 5 yes Figure 1 A partial enlarged view of the opening portion of the barrel body of the exemplary embodiment shown.

[0086] According to the embodiments of the present utility model, Figure 5 As shown, the vacuum outer barrel for the dilution refrigerator further comprises a sealing member arranged between the top plate 1 and the barrel body 2, which is suitable for sealing the sealing cavity.

[0087] In an illustrative embodiment, Figure 5 As shown, an annular groove 25 is provided on the top surface of the barrel body 2. In detail, the annular groove 25 is suitable for arranging a seal, wherein the seal includes but is not limited to an O-ring. In a preferred embodiment, the O-ring should be arranged in the annular groove 25 after being cleaned and coated with vacuum silicone grease, so that the top plate 1 and the barrel body 2 can be sealed when the vacuum is drawn.

[0088] Based on the same inventive concept as the vacuum outer barrel for a dilution refrigerator, the utility model also provides a refrigeration device, not shown in the figure, comprising a mounting frame, a vacuum outer barrel for a dilution refrigerator, and a dilution refrigerator. The vacuum outer barrel for the dilution refrigerator is suspended on the mounting frame. The dilution refrigerator is installed in the sealed cavity of the vacuum outer barrel for the dilution refrigerator. The refrigeration device has a similar technical effect as the vacuum outer barrel for a dilution refrigerator, and can conveniently assemble the dilution refrigerator and the configured vacuum outer barrel for the dilution refrigerator.

[0089] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only for reference to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention.

[0090] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A vacuum outer barrel for a dilution refrigerator, characterized in that: include: A top plate (1) is suspended on an external structural member; A barrel body (2) is suitable for being assembled on the top plate (1), wherein a sealed cavity isolated from an external air environment is defined between the barrel body (2) and the top plate (1); as well as The detection element (4) is connected to an external vacuum pump for communication, and the vacuum pump is connected to the sealing chamber; The outer edge of one of the top plate (1) and the barrel body (2) is provided with a shoulder, the inner edge of the shoulder is provided with a slide groove (13) along the circumferential direction, and the shoulder is also provided with at least two gaps (12) arranged at intervals and connected to the slide groove (13); the other of the top plate (1) and the barrel body (2) is provided with a convex edge (21) protruding radially outward, and the convex edge (21) is provided with a protrusion (23) corresponding to the notch (12); the detection member (4) outputs a control signal to the vacuum pump in response to a trigger position where the protrusion (23) is misaligned with the notch (12) and is located in the slide groove (13), so that the sealed cavity is evacuated to a vacuum state.

2. The vacuum outer barrel according to claim 1, characterized in that: The shoulder is provided on the top plate (1), and the convex edge (21) is provided at the opening position of the barrel body (2).

3. The vacuum outer barrel according to claim 2, characterized in that: The detection member (4) is arranged on the top plate (1), the detection member (4) penetrates the top plate (1), and the detection end of the detection member (4) is arranged facing the slide groove (13).

4. The vacuum outer barrel according to any one of claims 1 to 3, characterized in that: The top plate (1) is provided with an air extraction port (11) which is in communication with the vacuum pump.

5. The vacuum outer barrel according to any one of claims 1 to 3, characterized in that: It also includes a positioning piece (14), wherein the positioning piece (14) is arranged on the shoulder and protrudes from the shoulder toward a side facing the convex edge (21).

6. The vacuum outer barrel according to claim 5, characterized in that: The convex edge (21) is provided with a waist-shaped hole (24) corresponding to the positioning member (14), and the width of the first end of the waist-shaped hole (24) in the long direction is greater than the width of the second end in the long direction; Wherein, a convex head is provided at one end of the positioning member (14) away from the shoulder, and the width of the convex head is smaller than the width of the first end of the waist-shaped hole (24) and larger than the width of the second end of the waist-shaped hole (24).

7. The vacuum outer barrel according to any one of claims 1 to 3, characterized in that: It also includes a sealing member disposed between the top plate (1) and the barrel body (2), suitable for sealing the sealing cavity.

8. The vacuum outer barrel according to any one of claims 1 to 3, characterized in that: It also includes a fixing member (22) passing between the shoulder and the flange (21), which is suitable for fixing the barrel body (2) and the top plate (1).

9. The vacuum outer barrel according to any one of claims 1 to 3, characterized in that: It also includes a handle (3) arranged on the outer end surface of the barrel body (2).

10. A refrigeration device, characterized in that: include: Mounting frame; The vacuum outer barrel for a dilution refrigerator according to any one of claims 1 to 9, wherein the vacuum outer barrel for a dilution refrigerator is suspended on the mounting frame; and The dilution refrigerator is installed in the sealed cavity of the vacuum outer barrel for the dilution refrigerator.

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