Vacuum heat insulation structure and refrigerator
By introducing an air intake mechanism and mechanical control into the vacuum insulation structure, the problems of vacuum degree and thermal bridge effect in the prior art are solved, and a refrigerator design with high vacuum degree and good insulation performance is realized.
Patent Information
- Application Number
- CN202422997384.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-04
AI Technical Summary
Existing insulation structures cannot reduce the thermal bridge effect while ensuring a high vacuum degree inside the vacuum insulation structure, and the thickness and size are difficult to design accurately.
A vacuum insulation structure is designed, including a first component and a getter mechanism. Through the mechanical control of the getter and the second component, a high vacuum is maintained inside the cavity. The getter is wrapped by a protective shell. The driving part of the second component switches to different positions with the external control part to puncture the shell and activate the getter. Combined with the filler, the structural strength is improved.
It effectively reduces the internal air pressure of the cavity, reduces the thermal bridging effect, maintains a high vacuum level, and improves the heat preservation performance, making it suitable for the heat preservation structure design of refrigerators.
Smart Images
Figure CN223470402U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to refrigerator manufacturing technical field, concretely relates to a vacuum heat preservation structure and refrigerator. BACKGROUND
[0002] The low-thermal-conductivity heat preservation structure uses a micro-nano composite structure as a filling material, can obtain good heat insulation capacity, and realizes a thermal conductivity coefficient lower than 3 mW / (mK). Commonly used micro-nano composite structures as filling materials include fumed silica, nanoparticles, and glass fibers, and are often prepared into a core material by laminating micro-nano structures, and then packaged by a film bag made of a film material (mostly composed of a high polymer material, including a polyethylene layer as an adhesive and an aluminum plating layer as a gas barrier layer). Then, the film bag is vacuumized, and the polyethylene adhesive layer is sealed at high temperature to obtain a vacuum low-thermal-conductivity heat preservation structure with a microporous structure. However, the heat preservation structure prepared by this process has low strength and cannot be directly used in the final product as a structural part, and needs to be combined with polyurethane hard foam material and metal structural parts to improve the processing strength and forming capacity, so it is difficult to avoid structural thermal bridges, which increases the overall thermal conductivity of the structure and reduces the heat preservation performance of the product. At the same time, the thickness and size of this heat preservation structure are controlled by the overall strength of the core material and the air pressure, and cannot be accurately designed, which increases the difficulty of structural part design.
[0003] Currently, there is a process of pouring powder-like micro-nano structures into the cavity of a sealed structural part to make a heat preservation structure, which can reduce the processing difficulty and reduce the thermal bridge effect. However, the heat preservation structure made of micro-nano porous structure is affected by Knudsen effect, and it is difficult to obtain a vacuum degree below 1 Pa, that is, the existing heat preservation structure cannot reduce the thermal bridge effect while ensuring the high vacuum degree inside the vacuum heat insulation structure. UTILITY MODEL CONTENTS
[0004] The utility model aims to at least solve the problem that the existing heat preservation structure cannot reduce the thermal bridge effect while ensuring the high vacuum degree inside the vacuum heat insulation structure. The purpose is achieved by the following technical solutions:
[0005] The first aspect of the utility model provides a vacuum heat preservation structure, which comprises a first part and a getter mechanism, the first part has a cavity, the inside of the cavity is provided with a filling part, and the getter mechanism is arranged on the first part; the getter mechanism comprises:
[0006] A getter is arranged in the inside of the cavity, and the getter has a protective shell.
[0007] A second component is sealingly connected with the first component and is movable relative to the first component, the second component having a driving portion and an acting portion, the driving portion being located outside the cavity and capable of driving the acting portion to switch between a first working position and a second working position, in the first working position, the acting portion is spaced apart from the getter, in the second working position, the acting portion pierces the protective shell to enable the getter to communicate with the inside of the cavity.
[0008] The vacuum heat preservation structure comprises a first component and a getter mechanism. The second component is sealingly connected with the first component, which can effectively guarantee the sealing effect of the cavity, at this time, the air pressure inside the cavity can be reduced by external vacuum suction.
[0009] Meanwhile, the driving portion of the second component is arranged outside the cavity, and the driving portion can drive the acting portion to switch from the spaced first working position to the second working position that pierces the getter, thereby activating the getter inside the cavity by mechanical control while maintaining the sealing of the cavity, further reducing the air pressure inside the vacuum heat preservation structure, and maintaining the vacuum degree and heat preservation performance for a long time, which helps to solve the problem that the existing heat preservation structure cannot reduce the thermal bridge effect while maintaining the high vacuum degree inside the vacuum heat preservation structure.
[0010] In addition, the vacuum heat preservation structure according to the utility model can also have the following additional technical features:
[0011] In some embodiments of the utility model, at least two getter mechanisms are arranged on the first component.
[0012] In some embodiments of the utility model, the thickness of the protective shell is in the range of 0.05mm to 1mm.
[0013] In some embodiments of the utility model, a baffle is arranged on the driving portion, and the acting portion is arranged on the baffle and penetrates through the first component.
[0014] The getter mechanism further comprises a sealing member, which is clamped between the baffle and the first component and seals the baffle and the first component.
[0015] In some embodiments of the utility model, the sealing member is a flexible sealing ring, and the cross-sectional diameter of the flexible sealing ring is in the range of 1mm to 5mm.
[0016] In some embodiments of the utility model, the flexible sealing ring's available compression ratio is 0.3~0.8, and the flexible sealing ring's available stroke is greater than or equal to 0.5mm.
[0017] In some embodiments of the utility model, the air suction mechanism further comprises a bracket, the bracket is arranged inside the cavity, the air suction agent is arranged on the bracket and is in contact with or spaced apart from the inner wall of the cavity.
[0018] In some embodiments of the utility model, the first component is a metal piece, and the metal piece comprises an iron piece, a copper piece, an aluminum piece or an alloy piece.
[0019] In some embodiments of the utility model, the first component is provided with a discharge port, and vacuum suction is performed through the discharge port.
[0020] In some embodiments of the utility model, the air suction mechanism further comprises a sharp structure, and the sharp structure is detachably arranged on the action part.
[0021] In some embodiments of the utility model, the filler is a glass fiber component, an organic fiber component or a component formed by inorganic powder.
[0022] And / or, the filler is a porous structure.
[0023] The second aspect of the utility model further proposes a refrigerator comprising the vacuum heat insulation structure of the utility model.
[0024] The refrigerator of the utility model sets the vacuum heat insulation structure and uses the first component as the heat preservation component of the refrigerator, and the sealing connection between the second component and the first component can effectively guarantee the sealing effect inside the cavity, so that the external suction vacuum mode can be used to reduce the air pressure inside the cavity. Meanwhile, the driving part of the second component is arranged outside the cavity, and the driving part can drive the action part to switch from the first working position spaced apart from the air suction agent to the second working position of piercing the air suction agent, so that the air suction agent inside the cavity can be activated by mechanical control under the condition of maintaining the sealing of the cavity, thereby further reducing the air pressure inside the vacuum heat insulation structure, maintaining the vacuum degree and heat preservation performance for a long time, and helping to improve the heat preservation effect and service life of the refrigerator. BRIEF DESCRIPTION OF DRAWINGS
[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present application thereto, as the present application can have application in forms other than those illustrated. Moreover, in the drawings, like reference numerals designate like parts throughout the various figures. In the drawings:
[0026] Figure 1 A structural schematic diagram of a vacuum heat-insulating structure according to an embodiment of the present application is schematically shown;
[0027] Figure 2 For Figure 1 A partial structural schematic diagram of an air suction mechanism shown in FIG. 1 in a first working state;
[0028] Figure 3 For Figure 1 A partial structural schematic diagram of an air suction mechanism shown in FIG. 1 in a second working state;
[0029] Figure 4 For Figure 1 Another structural schematic diagram of an air suction mechanism shown in FIG. 1.
[0030] The various signs in the drawings represent the following:
[0031] 1000, a vacuum heat-insulating structure;
[0032] 100, a first part; 200, a filler; 300, an air suction mechanism;
[0033] 10, an upper side wall;
[0034] 20, an air suction agent; 21, a protective shell;
[0035] 30, a second part; 31, a driving part; 32, an acting part; 33, a baffle;
[0036] 40, a support;
[0037] 50, a sealing member;
[0038] 60, a sharp structure;
[0039] 70, a circular tube;
[0040] 80, a sealing ring. DETAILED DESCRIPTION
[0041] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.
[0042] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0043] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0044] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0045] The low-thermal-conductivity thermal insulation structure uses a micro-nano composite structure as a filling material, and can obtain good thermal insulation capacity and realize a thermal conductivity of less than 3 mW / (mK). Commonly used micro-nano composite structures as filling materials include fumed silica, nanoparticles, and glass fibers, and are often prepared into a core material by laminating micro-nano structures, and then packaged by a film bag made of a film material (mostly composed of a high polymer material, including a polyethylene layer as an adhesive and an aluminum plating layer as a gas barrier layer). Then, the film bag is vacuumized, and the polyethylene adhesive layer is sealed at high temperature to obtain a vacuum low-thermal-conductivity thermal insulation structure with a microporous structure.
[0046] However, the thermal insulation structure prepared by this process has low strength and cannot be directly used as a structural part in the final product, and needs to be combined with polyurethane hard foam material and metal structural parts to improve the processing strength and forming capacity, so it is difficult to avoid structural thermal bridges, which increases the overall thermal conductivity of the structure and reduces the thermal insulation performance of the product. At the same time, the thickness and size of the thermal insulation structure are controlled by the overall strength of the core material and the gas pressure, and cannot be accurately designed, which increases the difficulty of structural part design.
[0047] At present, low-thermal-conductivity thermal insulation structures are mostly prepared by a process of pouring powdered micro-nano structures into the cavity of a sealed structural part. Although this process can reduce the processing difficulty and reduce the thermal bridge effect, the thermal insulation structure made of micro-nano porous structures is difficult to obtain a high vacuum degree due to the Knudsen effect.
[0048] To solve the above technical problems, the vacuum thermal insulation structure 1000 is proposed to solve the problem that the existing thermal insulation structure cannot reduce the thermal bridge effect while ensuring the high vacuum degree inside the vacuum thermal insulation structure 1000.
[0049] Overall design, the vacuum thermal insulation structure 1000 includes a first component 100 and a getter mechanism 300. The first component 100 has a cavity, and the cavity has a filling piece 200 inside, and the getter mechanism 300 is arranged on the first component 100. The getter mechanism 300 includes a getter 20 and a second component 30. The getter 20 is arranged inside the cavity, and the getter 20 has a protective shell. The second component 30 is sealingly connected with the first component 100 and can move relative to the first component 100, and the second component 30 has a driving part 31 and an acting part 32, the driving part 31 is located outside the cavity, and can drive the acting part 32 to switch between the first working position and the second working position. In the first working position, the acting part 32 is arranged in a spaced manner with the getter 20, and in the second working position, the acting part 32 pierces the protective shell 21 to communicate the getter 20 with the inside of the cavity.
[0050] Specifically, by sealingly connecting the second component 30 with the first component 100, the sealing effect inside the cavity can be effectively guaranteed, at this time, the air pressure inside the cavity can be reduced by external suction vacuum. The setting of the filler 200 can improve the structural strength of the first component 100, thereby avoiding the deformation caused by vacuum suction, and also helps to reduce the air in the cavity, thereby reducing the suction amount of vacuum suction. At the same time, by setting the driving part 31 of the second component 30 outside the cavity, and the driving part 31 can drive the action part 32 to switch from the first working position spaced from the getter 20 to the second working position of piercing the getter 20, it realizes that the getter 20 inside the cavity is activated by mechanical control under the condition of keeping the cavity sealed, thereby further reducing the internal air pressure of the cavity, and long-term maintaining the vacuum degree and heat preservation performance, which helps to solve the problem that the existing heat preservation structure cannot reduce the thermal bridge effect while guaranteeing the high vacuum degree inside the vacuum heat preservation structure 1000.
[0051] It should be understood that the first component 100 can be provided in a cuboid shape, at this time, as shown in Figure 1 The cross-sectional shape of the first component 100 is a square structure. The first component 100 is provided with a filler, which is a porous structure. The first component 100 is provided with a getter mechanism 300, at this time, the getter mechanism 300 is provided on the first component 100, and one end of the getter mechanism 300 is located inside the cavity, and the other end of the getter mechanism 300 is located outside the cavity. In this embodiment, the getter mechanism 300 includes a getter 20 and a second component 30. Among them, the getter 20 is arranged inside the cavity, the second component 30 is sealingly connected with the first component 100 and can move relative to the first component 100, and the driving part 31 of the second component is located outside the cavity.
[0052] Still as Figure 1As shown, the upper side wall 10 of the first component 100 is taken as an example for description, and the upper side wall 10 is provided with the air suction mechanism 300. In the embodiment, the getter 20 is arranged inside the cavity and is spaced apart from the upper side wall 10. The second component 30 is sealingly connected to the first component 100 and is movable relative to the first component 100, and the second component 30 has a driving part 31 and an acting part 32. The acting part 32 has a first working position and a second working position and can be switched between the first working position and the second working position along with the movement of the driving part 31, that is, the air suction mechanism 300 has a first working state and a second working state. When the air suction mechanism 300 is in the first working state, the acting part 32 is in the first working position and is spaced apart from the getter 20. At this time, the acting part 32 can be arranged inside the cavity, on the first component 100, or outside the cavity, which is not limited here. When the air suction mechanism 300 is in the second working state, the acting part 32 is in the second working position and abuts against and pierces the protective shell of the getter 20, so that the getter 20 works.
[0053] It should be noted that the structure of the first component 100 can be other shapes, such as U-shaped, ring-shaped, semicircular, or special-shaped structures, which are not limited here.
[0054] It should be further understood that the first component 100 is provided with a discharge port, and vacuum suction is performed through the discharge port. In the embodiment, the first component 100 is a rigid structure that can be externally vacuumed and sealed. By setting the first component 100 as a rigid structure, it is helpful to ensure that the overall structure of the first component 100 does not deform under the internal pressure of the cavity below 0.01 Pa. Alternatively, the first component 100 and the discharge port can be arranged by using existing structures, which are not described here. At the same time, the first component 100 is a sealed structure, which is helpful to ensure the implementation of external vacuuming.
[0055] It should be further understood that in the embodiment, the getter 20 is arranged to have the ability to adsorb gas under high vacuum, which can further improve the vacuum degree inside the vacuum heat insulation structure 1000, wherein the high vacuum degree refers to the internal pressure of the cavity being lower than 10 Pa. The getter 20 can include a gas adsorbent that absorbs target gas, wherein the gas adsorbent can be a nitrogen adsorbent that absorbs nitrogen and a moisture adsorbent that absorbs moisture.
[0056] Specifically, since the first component 100 is vacuumed through the exhaust port, the main gas remaining inside the cavity is nitrogen, oxygen, water, and carbon dioxide. Nitrogen, oxygen, and water all have high thermal conductivity, and their presence in the cavity greatly affects the deterioration of thermal conductivity. Therefore, in the present embodiment, the getter 20 can include a material having a nitrogen adsorption capacity, because the getter 20 is present in the cavity or absorbs nitrogen gas introduced from the outside into the cavity. Specifically, the material of the nitrogen adsorbent is at least one of lithium (Li), vanadium (V), and zirconium (Zr), for example, metallic lithium and / or a lithium alloy. Alternatively, the material of the nitrogen adsorbent is a lithium-barium (Li-Ba) alloy, which has good adsorption performance in terms of high nitrogen.
[0057] Since the getter 20 is present in the cavity, and there is moisture in the cavity, in order to reduce the effect of moisture on the getter, the getter 20 optionally includes an adsorbent material having a moisture adsorption capacity, i.e., a moisture adsorbent. The moisture adsorbent is not particularly limited and can be an alkaline earth oxide as a chemical moisture adsorbent. The alkaline earth oxide is one or a mixture thereof selected from the group consisting of calcium oxide, magnesium oxide, strontium oxide, and barium oxide. Specifically, calcium oxide can absorb moisture in an environment with very low vapor pressure, and is preferred in terms of cost. It is expected that calcium oxide with a large specific surface area is easy to absorb moisture.
[0058] In addition, a physical moisture adsorbent can also be used. As a physical moisture adsorbent, for example, at least one selected from the group consisting of zeolite, alumina, and silica gel can be used.
[0059] It is further understood that in the present embodiment, the cavity is provided with a filler 200, which is a porous structure. Optionally, the filler 200 is a glass fiber member, an organic fiber member, or a member formed of inorganic powder. In the present embodiment, the filler 200 is composed of glass fibers. On the one hand, it helps to improve the structural strength of the first component 100, avoiding the deformation of the first component, and on the other hand, it can guarantee the filling effect inside the cavity and ensure that the getter 20 can effectively adsorb the gas inside the cavity when working.
[0060] Further, the first component 100 is provided with at least two getter mechanisms 300.
[0061] Specifically, by setting at least two getter mechanisms 300 on the first component 100, on the one hand, the problem that the gas in the partial space cannot be adsorbed due to the structure shape can be prevented, and the high vacuum degree inside the vacuum heat preservation structure 1000 can be ensured; on the other hand, since the getter mechanism 300 is mechanically controlled, the getter agent 20 can be first punctured, and the subsequent getter agent 20 can be punctured after a period of time, so that the vacuum heat preservation structure 1000 can maintain the vacuum degree for a long time, and the service life of the vacuum heat preservation structure 1000 can be further improved.
[0062] It should be understood that in the present embodiment, the getter mechanism 300 can be arranged on the upper side wall, the left side wall, the right side wall, the front side wall and the rear side wall of the first component 100, and adjacent two getter mechanisms are arranged at intervals, and the interval distance is designed according to the actual size of the first component 100, and can also be designed in combination with the getter capacity of the getter agent, and is not limited here.
[0063] Further, the first component 100 is a metal piece, which includes an iron piece, a copper piece, an aluminum piece or an alloy piece.
[0064] Specifically, by setting the first component 100 as a metal piece, the structural strength of the first component 100 can be ensured, so that the first component 100 will not deform when the getter agent 20 works. By limiting the material of the metal piece to include iron, copper and aluminum, the manufacturing difficulty of the first component 100 can be reduced, and the manufacturing efficiency of the first component 100 can be improved.
[0065] It should be understood that the first component 100 can be composed of iron, copper or aluminum and an alloy with them as the main component, at this time, the cavity can ensure that the outside of the structure does not deform under an internal pressure of 0.01 Pa or less. In the present embodiment, the first component 100 is composed of stainless steel, and the product of stainless steel is mature and can be directly purchased and used, which helps to improve the manufacturing efficiency of the first component 100. Of course, in addition thereto, the first component 100 can also be made of other materials, such as plastic, wood, stone, etc., as long as the outside of the cavity can be prevented from deforming under low pressure.
[0066] Further, the thickness of the protective shell is in the range of 0.05mm to 1mm.
[0067] Specifically, by limiting the thickness of the protective shell 21, on the one hand, the protective shell 21 can be prevented from being accidentally damaged during installation due to the thickness being too thin; on the other hand, the protective shell 21 can be prevented from being difficult to puncture due to being too thick, so that the getter agent 20 cannot be activated.
[0068] It should be understood that the protective shell 21 adopts a rigid structure with low hardness, and the protective shell 21 is optionally made of iron, copper or aluminum and an alloy with the same as the main component. In the embodiment, the protective shell 21 is made of an aluminum alloy, and at this time, the protective shell 21 is easily pierced under the extrusion of an external sharp metal, thereby helping to ensure that the getter 20 can be effectively activated. The thickness of the protective shell is in the range of 0.05mm to 1mm. Preferably, the thickness of the protective shell is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm...0.85mm, 0.9mm, 0.95mm, 1.0mm. Among them, the effect is best when the thickness of the protective shell ranges from 0.1mm to 0.3mm, so in the embodiment, the thickness of the protective shell is 0.1mm.
[0069] Further, the vacuum heat insulation structure 1000 further comprises a bracket 40, the bracket 40 is arranged in the cavity, the getter 20 is arranged on the bracket 40 and in contact with or spaced from the inner wall of the cavity.
[0070] Specifically, by arranging the bracket 40, a containing space can be formed on the side wall of the first component 100, which can be used to contain the getter 20 on the one hand, and ensure the installation effect of the getter 20, and on the other hand, provide a moving space for the second component 30, that is, ensure that the acting part 32 of the second component 30 will not be affected when moving from the first working position to the second working position.
[0071] It should be understood that the getter mechanism 300 further comprises a bracket 40, in the embodiment, as shown in Figure 2 and Figure 3 The bracket 40 can be arranged in a square structure, the side of the bracket 40 facing the second component 30 is open, and the bracket 40 and the first component 100 can be fixedly connected in a screwing manner, or other connection manners such as clamping, bonding, buckling connection, welding, etc., so as to ensure that the bracket 40 will not move when the second component 30 works. The getter 20 is arranged on the bracket 40 and in communication with the cavity, which helps to ensure the working effect of the getter 20.
[0072] It should be pointed out that in addition to the arrangement of the getter 20 spaced from the inner wall of the cavity, the getter 20 can also be connected with the inner wall of the cavity, at this time, when the acting part 32 of the second component 30 pierces the getter 20, the working effect of the getter 20 can still be ensured.
[0073] Further, the driving part 31 is provided with a baffle 33, and the acting part 32 is arranged on the baffle 33 and penetrates through the first component 100. The air suction mechanism 300 further comprises a sealing member 50, which is clamped between the baffle 33 and the first component 100 and seals the baffle 33 and the first component 100.
[0074] Specifically, the baffle 33 is arranged, which can provide a mounting basis for the driving part 31, and can cooperate with the sealing member 50, so as to guarantee the connection effect of the second component 30 and the first component 100.
[0075] It should be understood that the second component 30 is arranged as a fastener, which is screwed on the first component 100, and at this time, the second component 30 is sealed with the first component 100. Alternatively, the second component 30 is arranged as a screw, a bolt or a stud. In this embodiment, the second component 30 is a drill screw, which comprises a screw head, a circular platform and a screw rod. Figure 2 and Figure 3 As shown in the drawings, the screw head is the driving part 31, the circular platform is the baffle 33, and the baffle 33 is used to clamp the sealing member 50 in cooperation with the first component 100. The screw rod is the acting part 32, and is screwed on the first component 100, and the end of the screw rod away from the screw head is provided with a drill bit, which can be used to pierce the protective shell 21. Arranging the second component 30 as a drill screw can further reduce the manufacturing difficulty and cost of the vacuum heat-insulating structure 1000, and improve the manufacturing efficiency of the vacuum heat-insulating structure 1000.
[0076] It should be pointed out that in this embodiment, the driving part 31, the acting part 32 and the baffle 33 are integrally formed, of course, in addition, the driving part 31, the acting part 32 and the baffle 33 can also be fixed together by screwing or welding and the like.
[0077] In addition, the sealing member 50 can be arranged as a rigid sealing member, and when the acting part 32 is located at the second working position, the two ends of the sealing member 50 abut against the baffle 33 and the first component 100, respectively. Alternatively, the sealing member 50 and the baffle 33 or the first component 100 can adopt a stepped structure or other way of contact. The sealing member 50 can be arranged as a flexible sealing member, at this time, the sealing member 50 can deform when the acting part 32 switches between the first working position and the second working position, that is, the sealing member 50 abuts against the baffle 33 and the first component 100 when the acting part 32 is at the first working position and the second working position.
[0078] In addition, the second component 30 can also be arranged in other shapes, so as to realize the external operation of the second component 30 and the damage to the air suction agent 20. Figure 4As shown, the second component 30 is provided as a combination of a round tube and a stud, wherein the round tube 70 is arranged on the first component 100 and sealed with the first component 100 by the sealing ring 80, and the stud is screwed in the interior of the round tube 70 and can slide relative to the round tube 70.
[0079] It should be further understood that the getter mechanism 300 further comprises the spike structure 60, which can be arranged on the action portion 32 of the second component 30 and can pierce the getter 20 along with the movement of the action portion 32. Alternatively, the spike structure 60 can be sleeved on or screwed on the second component 30, or arranged on the action portion 32 of the second component 30 by other means such as adhesion.
[0080] Further, the sealing member 50 is provided as a flexible sealing ring, and the cross-sectional diameter of the flexible sealing ring is 1mm-5mm.
[0081] Specifically, by providing the sealing member 50 as a flexible sealing ring, the flexible sealing ring can seal the vacuum environment with air pressure of 0.1Pa or above within a wider compression ratio, thereby ensuring the sealing effect of the vacuum heat insulation structure 1000. By limiting the cross-sectional diameter of the flexible sealing ring, on the one hand, it helps to reduce the low sealing yield, and on the other hand, it can reduce the influence of the sealing member 50 on the second component 30.
[0082] It should be understood that, as shown in Figure 2 and Figure 3 , the sealing member 50 is provided as a flexible sealing ring, and the flexible sealing ring is made of a polymer material. Alternatively, the flexible sealing ring is a flexible sealable structure made of polytetrafluoroethylene material. At this time, the flexible sealing ring has a wider compression ratio, and can thus seal the vacuum environment with air pressure of 0.1Pa or above. Alternatively, the cross-sectional diameter of the flexible sealing ring is 1mm-5mm, wherein the cross-sectional diameter of the flexible sealing ring can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm. Among them, the sealing effect is best when the cross-sectional diameter of the flexible sealing ring is in the range of 2mm to 3mm, which can ensure the movement of the second component 30 on the first component 100. Therefore, in this embodiment, the cross-sectional diameter of the flexible sealing ring is 2mm. Too small cross-sectional diameter will result in low sealing yield, and too large cross-sectional diameter will affect the size of the baffle 33, thereby limiting the size of the second component 30.
[0083] It is further understood that the flexible sealing ring has an effective compression ratio of 0.3-0.8, and the effective stroke of the flexible sealing ring is greater than or equal to 0.5 mm. By limiting the effective compression ratio of the flexible sealing ring, on the one hand, the deformation of the flexible sealing ring is ensured, and the sealing effect can be further improved; on the other hand, the movement of the second component 30 is limited to prevent excessive movement. In actual use, when the second component 30 (fastener) is screwed on the first component 100 and is in the first working state, the compression ratio of the flexible sealing ring is in a larger compression ratio, at this time, the flexible sealing ring can be sealed and the acting part 32 will not contact the protective shell. When the second component 30 (fastener) is screwed on the first component 100 and is in the second working state, the compression ratio of the flexible sealing ring is in a smaller compression ratio, at this time, the flexible sealing ring can be sealed and the acting part 32 penetrates the protective shell, and the getter 20 can play a role, further reducing the vacuum degree.
[0084] It is pointed out that the effective stroke refers to the difference between the maximum and minimum compression ratios of the above-mentioned cross-sectional diameter, and in the present embodiment, the effective stroke is not less than 0.5 mm, effectively ensuring the movement distance of the acting part 32, on the one hand, ensuring that the acting part 32 will not damage the getter 20 during installation, and on the other hand, ensuring that the acting part 32 can damage the getter 20.
[0085] In actual use, the getter 20 is first packaged in the protective shell 21, then the protective shell 21 is fixed on the bracket 40, and the bracket 40 is fixed on the inner side wall of the cavity. The second component 30 (fastener) is fixed on the first component 100 by screwing, and the second component 30 (fastener) is locked to be in the first working state, that is, the acting part 32 is located at the first working position, at this time, the compression ratio of the flexible sealing ring is 0.7. The flexible sealing ring can be sealed and the acting part 32 will not contact the getter 20 shell.
[0086] Then, the cavity is pumped to 15 Pa. The thermal conductivity of the entire vacuum thermal insulation structure 1000 is measured, which is 9.5 mW / mK.
[0087] Then, the second component 30 (fastener) is continuously locked and is in the second working state, that is, the acting part 32 is located at the second working position, at this time, the compression ratio of the flexible sealing ring is 0.4. The flexible sealing ring can be sealed and the tip penetrates the getter 20 shell, and the getter 20 can play a role, reducing the vacuum degree to 2 Pa.
[0088] Finally, the thermal conductivity of the entire vacuum insulation structure is measured again, and the thermal conductivity is 5.6 mW / mK. Therefore, the getter mechanism 300 can further improve the vacuum degree of the vacuum insulation structure, reduce the thermal conductivity, and improve the heat insulation performance of the vacuum insulation structure in the sealed vacuum insulation structure 1000.
[0089] The present embodiment also relates to a refrigerator comprising the above-mentioned vacuum insulation structure 1000.
[0090] Specifically, by arranging the vacuum insulation structure 1000 and taking the first component 100 as the heat preservation part of the refrigerator, the sealing effect of the cavity can be effectively guaranteed by the sealed connection between the second component 30 and the first component 100, so that the air pressure in the cavity can be reduced by external suction of vacuum. At the same time, by arranging the driving part 31 of the second component 30 outside the cavity, and the driving part 31 can drive the action part 32 to switch from the first working position spaced from the getter 20 to the second working position of piercing the getter 20, the getter in the cavity is activated by mechanical control while keeping the cavity sealed, so as to further reduce the air pressure in the vacuum insulation structure 1000, and long-term maintain the vacuum degree and heat preservation performance, which helps to improve the heat preservation effect and service life of the refrigerator.
[0091] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A vacuum thermal insulation structure, characterized by, The first component has a cavity, the inside of which is provided with a filler, and the getter mechanism is arranged on the first component; the getter mechanism comprises: a getter arranged in the inside of the cavity, the getter having a protective shell; a second component in sealed connection with the first component and movable relative to the first component, the second component having a driving part and an acting part, the driving part being located outside the cavity and capable of driving the acting part to switch between a first working position and a second working position, in the first working position, the acting part is arranged in spaced relation to the getter, and in the second working position, the acting part pierces the protective shell to enable the getter to communicate with the inside of the cavity.
2. The vacuum thermal insulating structure according to claim 1, characterized in that, The first component is provided with at least two getter mechanisms. 3.The vacuum thermal-insulation structure according to claim 1, wherein The thickness of the protective shell is in the range of 0.05mm to 1mm. 4.The vacuum thermal-insulation structure according to claim 1, wherein The driving part is provided with a baffle, the acting part is arranged on the baffle and penetrates through the first component; The getter mechanism further comprises a sealing member, which is clamped between the baffle and the first component and seals the baffle and the first component. 5.The vacuum thermal insulation structure according to claim 4, characterized in that, The sealing member is arranged as a flexible sealing ring, the cross-sectional diameter of the flexible sealing ring being in the range of 1mm to 5mm. 6.The vacuum thermal insulation structure according to claim 5, characterized in that, The effective compression ratio of the flexible sealing ring is 0.3 to 0.8, and the effective stroke of the flexible sealing ring is greater than or equal to 0.5mm. 7.The vacuum thermal-insulation structure according to claim 1, wherein The getter mechanism further comprises a bracket arranged in the inside of the cavity, the getter being arranged on the bracket and in contact with or spaced from the inner wall of the cavity. 8.The vacuum thermal-insulation structure according to claim 1, wherein The first component is a metal piece, which includes an iron piece, a copper piece, an aluminum piece or an alloy piece. 9.The vacuum thermal insulation structure according to claim 8, wherein, The first component is provided with a discharge port, wherein vacuum suction is performed through the discharge port. 10.The vacuum thermal-insulation structure according to claim 1, wherein The getter mechanism further comprises a spike structure, which is detachably arranged on the acting part. 11.The vacuum thermal-insulation structure according to any one of claims 1 to 10, wherein, The filler is a glass fiber member, an organic fiber member or a member formed of inorganic powder; and / or, the filler is a porous structure.
12. A refrigerator characterized by comprising: The vacuum heat-insulating structure comprises the vacuum heat-insulating structure according to any one of claims 1 to 11.