Electromagnetic pressing pressure relief device for ultra-low temperature refrigerator

Abstract

The utility model relates to a pressure relief device technical field, concretely relates to a kind of super-low temperature refrigerator electromagnetic compression pressure relief device, comprising: pressure relief part, including the cover plate being installed in the inside of box door, the cover plate is equipped with air passage valve subassembly, and the air passage valve subassembly inner end side inserts the pre-buried sleeve for the pressure conduction of box inside and outside;The cover plate is rotatably installed with ferromagnetic pressing plate through base, and electromagnet is installed on the base;When the electromagnet attraction, the ferromagnetic pressing plate oppresses the air passage valve subassembly and carries out pressure relief;The super-low temperature refrigerator electromagnetic compression pressure relief device, by the pressure relief part equipped with electromagnet and spring pressure relief collaborative operation can be realized, improves the reliability, stability of pressure relief operation, can have the realization of active pressure relief and passive pressure relief combination;The passive pressure relief function is still had after single electromagnet failure in the present application, improves the service life of equipment, and the device can guarantee that the pressure relief passage avoids the problem of icing blockage.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure relief devices, specifically to an electromagnetic pressure relief device for an ultra-low temperature freezer. Background Technology

[0002] Because of the extreme temperature difference between the inside and outside of ultra-low temperature refrigerators, a significant pressure difference can easily form after the door is opened or closed, making it difficult to open the door again and seriously affecting the user experience. To address this, refrigerator manufacturers equip their refrigerators with door opening or closing pressure relief devices to balance the pressure inside and outside the refrigerator and ensure smooth door opening and closing.

[0003] Currently, the mainstream pressure relief devices for ultra-low temperature freezers are mainly divided into two categories. One type is the spring-engaged passive pressure relief device, which relies on the pressure difference between the inside and outside of the freezer to achieve air intake and thus balance the pressure. This device has strong structural stability, but it has obvious defects: when the pressure difference between the inside and outside of the freezer is low, the opening range of the spring valve core is small, the airflow is poor, and the pressure relief is not complete. The other type is the electromagnetic telescopic rod movable switch pressure relief device, which uses software control to actively open the pressure relief channel at a time or a fixed pressure. However, in practical applications, the engagement accuracy of the front closing cap is insufficient during the opening and closing process of the electromagnetic rod, and the electromagnetic telescopic rod is prone to overheating and damage during long-term energized movement, making it difficult to reliably meet the needs of long-term ventilation.

[0004] In summary, existing pressure relief devices for cryogenic freezers still have shortcomings in terms of pressure relief stability and reliability. A pressure relief device that combines active and passive pressure relief is needed to meet the pressure relief requirements under complex operating conditions. Therefore, we propose an electromagnetic pressure relief device for cryogenic freezers. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings mentioned in the background art and provide an electromagnetic pressure relief device for ultra-low temperature freezers.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An electromagnetic pressure relief device for an ultra-low temperature freezer, comprising: The pressure relief section includes a cover plate installed inside the box door to provide an installation base, a vent valve assembly is installed on the cover plate, and a pre-embedded sleeve for conducting the pressure inside and outside the box is inserted into the inner end of the vent valve assembly. A ferromagnetic pressure plate is rotatably mounted on the cover plate via a base, and an electromagnet for attracting the ferromagnetic pressure plate to rotate is mounted on the base; When the electromagnet is attracted, the ferromagnetic pressure plate presses down on the vent valve assembly to release pressure.

[0007] Preferably, the vent valve assembly includes a positioning sleeve on which an air intake heater and a sleeve valve cover are detachably installed at the inner and outer ends, respectively. An inner clamping cavity with a conductive connection is provided between the positioning sleeve and the sleeve valve cover, and a valve core unit is detachably installed in the inner clamping cavity.

[0008] Preferably, the valve core unit includes a positioning ring cover and a frustum-shaped abutment connected by a connecting plate; The frustum-shaped abutment block has a shaft hole at its center, and a limiting groove is provided around the shaft hole.

[0009] Preferably, a shaft is slidably inserted into the shaft hole, and a sealing valve cap is connected to the outer end of the shaft and located inside the positioning ring cover; A spring is installed inside the limiting groove to push the sealing valve cap outward.

[0010] Preferably, the inner wall of the positioning ring cover is provided with a sealing gasket for fitting the sealing valve cap to keep it closed.

[0011] Preferably, a pin is installed at the outer end of the ferromagnetic pressure plate to press the sealing valve cap inward to release pressure during attraction.

[0012] Preferably, the inner end of the pre-embedded sleeve is provided with a through hole cavity that communicates with the inside of the refrigerator.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The electromagnetic pressure relief device for the ultra-low temperature freezer, through its pressure relief section, enables the electromagnet and spring to work together to relieve pressure, thereby improving the reliability and stability of the pressure relief operation and combining active and passive pressure relief. 2. This application still has a passive pressure relief function after a single electromagnet failure, which improves the service life of the equipment, and this device can ensure that the pressure relief channel is not blocked by ice. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is one of the installation diagrams of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the overall device and cover plate installation of this utility model; Figure 3 This is a schematic diagram of the overall structure of this utility model; Figure 4 This is an exploded view of the overall structure and installation relationship of this utility model; Figure 5 This is one of the exploded views of the installation relationship of the vent valve assembly of this utility model; Figure 6 This is the second exploded view of the installation relationship of the vent valve assembly of this utility model; Figure 7 This is a cross-sectional exploded view of the valve core unit of this utility model; Figure 8 This is a schematic diagram of the closed cross-section of the valve core unit according to an embodiment of the present invention; Figure 9 This is a schematic cross-sectional view of the valve core unit in an embodiment of the present invention. Figure 10 This is a schematic diagram of the pre-embedded sleeve of this utility model.

[0015] The meanings of the labels in the diagram are as follows: 1. Box door; 2. Cover plate; 3. Base; 4. Electromagnet; 5. Ferromagnetic pressure plate; 6. Ejector pin; 7. Embedded sleeve; 71. Conductor hole cavity; 8. Vent valve assembly; 81. Positioning sleeve; 82. Valve core unit; 821. Positioning ring cover; 822. Frustum-shaped stop block; 8201. Shaft hole; 8202. Limiting groove cavity; 823. Spring; 824. Sealing valve cap; 825. Shaft; 826. Sealing gasket; 827. Connecting plate; 83. Sleeve valve cover; 84. Inlet heater. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] Please see Figure 1-10 The present invention will describe the above technical solution in detail through the following embodiments: This embodiment uses an electromagnetic pressure relief device for an ultra-low temperature freezer, such as... Figure 8 , Figure 9 The structure shown includes a pressure relief section comprising a cover plate 2 installed inside the door 1 to provide an installation base, a vent valve assembly 8 horizontally installed on the cover plate 2, and a pre-embedded sleeve 7 aligned with the position of the vent valve assembly 8 installed inside the door 1. The inner end of the vent valve assembly 8 is inserted into the pre-embedded sleeve 7, and the inner end of the pre-embedded sleeve 7 is provided with a through hole 71 communicating with the inside of the refrigerator, maintaining an internal and external passage and achieving smooth pressure relief.

[0018] Specifically, a base 3 is detachably installed on the cover plate 2, and a ferromagnetic pressure plate 5 is rotatably installed on the outside of the base 3. A pin 6 is installed on the outer end of the ferromagnetic pressure plate 5, and an electromagnet 4 is installed on the base 3. The electromagnet 4 attracts the ferromagnetic pressure plate 5, which drives the pin 6 at the outer end to press the sealing valve cap 824 inside the vent valve assembly 8 to release pressure.

[0019] like Figures 2-7 As shown in the diagram, the vent valve assembly 8 includes a positioning sleeve 81 with an intake heater 84 and a sleeve valve cover 83 detachably mounted on its inner and outer ends, respectively. It should be noted that the intake heater 84 uses an electric heating rod to ensure the pressure relief passage remains unobstructed by heating, preventing blockage due to condensation freezing. An inner cavity with a conductive connection is provided between the positioning sleeve 81 and the sleeve valve cover 83. A valve core unit 82 is detachably mounted in this inner cavity. When the positioning sleeve 81 and the sleeve valve cover 83 are closed by screws, a connecting plate 827, whose inner and outer ends are connected to a frustum-shaped stop 822 and a positioning ring cover 821, maintains a fixed position within the valve core unit 82. The non-sealed connecting plate 827 is designed to provide a pressure relief passage.

[0020] like Figure 7 As shown in the structure, in this embodiment, a shaft hole 8201 and a limiting groove 8202 are coaxially arranged on the frustum-shaped abutment block 822 from the inside to the outside. A shaft rod 825 is slidably inserted into the shaft hole 8201, and a sealing valve cap 824 is fixedly connected to the outer end of the shaft rod 825. A spring 823 is provided at the inner end of the sealing valve cap 824 and inserted into the limiting groove 8202. The spring 823 maintains an elastic force that compresses the sealing valve cap 824 outward. In order to maintain the seal, a sealing washer 826 is provided on the inner wall of the positioning ring cover 821 to fit the sealing valve cap 824 and keep it closed. That is, when the ejector pin 6 does not press the sealing valve cap 824 to release pressure, and the internal and external pressure difference is balanced, the sealing washer 826 is closed.

[0021] The working principle of the electromagnetic pressure relief device for the ultra-low temperature freezer in this embodiment is as follows: When the electromagnet 4 is energized, the ferromagnetic pressure plate 5 rotates inward. At this time, the ejector pin 6 presses the sealing valve cap 824 and squeezes the spring 823 until the sealing valve cap 824 separates from the sealing gasket 826 to achieve gas exchange balance. When the electromagnet 4 is de-energized, the ferromagnetic pressure plate 5 and the sealing valve cap 824 are pushed outward by the spring 823 to reset. When the electromagnet 4 malfunctions, after a pressure difference occurs inside and outside, the sealing valve cap 824 can still be separated by the pressure difference to achieve air intake and passively balance the air pressure.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. An electromagnetic pressure relief device for an ultra-low temperature freezer, characterized in that: include: The pressure relief section includes a cover plate (2) installed inside the box door (1) to provide an installation base, a vent valve assembly (8) is installed on the cover plate (2), and a pre-embedded sleeve (7) for conducting the pressure inside and outside the box is inserted into the inner end of the vent valve assembly (8). A ferromagnetic pressure plate (5) is rotatably mounted on the cover plate (2) via a base (3), and an electromagnet (4) for attracting the ferromagnetic pressure plate (5) to rotate is mounted on the base (3). When the electromagnet (4) is attracted, the ferromagnetic pressure plate (5) presses the vent valve assembly (8) to release pressure.

2. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 1, characterized in that: The vent valve assembly (8) includes a positioning sleeve (81) on which an air intake heater (84) and a sleeve valve cover (83) are respectively detachably installed at the inner and outer ends. An inner clamping cavity with a conductive connection is provided between the positioning sleeve (81) and the sleeve valve cover (83), and a valve core unit (82) is detachably installed in the inner clamping cavity.

3. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 2, characterized in that: The valve core unit (82) includes a positioning ring cover (821) and a frustum-shaped abutment (822) that are connected through a connecting plate (827). The frustum-shaped abutment (822) has a shaft hole (8201) at its center and a limiting groove (8202) around the shaft hole (8201).

4. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 3, characterized in that: A shaft (825) is slidably inserted into the shaft hole (8201), and a sealing valve cap (824) is connected to the outer end of the shaft (825) and located inside the positioning ring cover (821). A spring (823) is installed inside the limiting groove (8202) to push the sealing valve cap (824) outward.

5. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 4, characterized in that: The inner wall of the positioning ring cover (821) is provided with a sealing gasket (826) for fitting the sealing valve cap (824) to keep it closed.

6. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 4, characterized in that: The outer end of the ferromagnetic pressure plate (5) is equipped with a pin (6) for depressurizing the sealing valve cap (824) by pressing it inward during attraction.

7. The electromagnetic pressure relief device for an ultra-low temperature freezer as described in claim 1, characterized in that: The inner end of the pre-embedded sleeve (7) is provided with a through hole cavity (71) that communicates with the inside of the refrigerator.

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