Negative pressure type door body handle structure of ultra-low temperature refrigerator
By designing a hollow handle shell, drainage groove, and sealing structure in the ultra-low temperature freezer, the problems of handle freezing and difficult opening are solved, achieving safe and convenient door operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG GANGTONG ELECTRICAL APPLIANCES CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-19
AI Technical Summary
The handles of existing ultra-low temperature freezers are prone to freezing in low-temperature environments and require effort to open. Traditional designs also suffer from cold bridging effects and strong negative pressure adsorption.
A negative pressure door handle structure was designed, including a hollow handle shell, a drainage groove, a sealing ring, and a spring. By reducing heat conduction, draining condensate, and balancing air pressure, the surface temperature and opening resistance are reduced.
It effectively prevents the handle from freezing, reduces the difficulty of opening, improves operational safety and convenience, and reduces cold loss.
Smart Images
Figure CN224262042U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of door handle technology, specifically a negative pressure door handle structure for an ultra-low temperature freezer. Background Technology
[0002] The negative pressure door handle of an ultra-low temperature freezer is a specialized opening and closing device designed for ultra-low temperature environments below -80℃. It achieves door sealing and easy opening through a unique air pressure balance principle. Its core structure includes a built-in negative pressure spring, a sealing strip, and a lever-type handle assembly. When closing, the handle mechanically compresses the sealing strip between the freezer and the door, simultaneously triggering the negative pressure spring to create a slight internal negative pressure. This pressure difference enhances the sealing performance, preventing the intrusion of hot air and subsequent cold air loss. When opening, the handle's built-in unlocking mechanism breaks the negative pressure balance, and the lever design reduces opening resistance, avoiding the difficulty of opening caused by the hardening and sticking of the rubber sealing strip at low temperatures. However, existing freezer handles still have some problems in use:
[0003] For example, the technical solution of the freezer with application number 201210499546.7 includes: a cabinet body, a door body, a door handle, and a controller. Specifically, a refrigeration compartment is formed inside the cabinet body, and the door body is located on the cabinet body for opening and closing the refrigeration compartment; the door handle is located on the door body; and the controller is located on the door handle. However, the handles of existing freezers for ultra-low temperature freezers have the risk of freezing at low temperatures. Traditional handles are in direct contact with the door body, and the cold bridge effect causes the surface temperature of the handle to drop sharply, making it easy for the handle to freeze and stick to the operator's gloves. Under negative pressure, the door body has a large suction force, and traditional handles cannot provide sufficient torque to open it.
[0004] In view of this, in-depth research was conducted on the above issues, which led to the creation of this case.
[0005] To address the aforementioned issues, an innovative design was implemented based on the existing freezer handles. Utility Model Content
[0006] The purpose of this invention is to provide a negative pressure door handle structure for an ultra-low temperature freezer, so as to solve the problems mentioned in the background art, such as the risk of freezing at low temperatures and the difficulty in opening the freezer.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A negative pressure door handle structure for an ultra-low temperature freezer includes a handle housing, which is installed on the front side of the negative pressure door body and hinged to the upper edge of the ultra-low temperature freezer body on the rear side. Mounting holes are provided on the left and right sides of the front side of the negative pressure door body, and connecting pipes pass through these holes. The connecting pipes are connected to the rear side of the handle housing, and mounting blocks are provided at the front ends of the connecting pipes. The front ends of the mounting blocks are connected to the left and right sides of the rear end of the handle housing. A sealing sleeve is fixedly installed on the rear side of the mounting holes of the negative pressure door body, and the connecting pipe passes through the interior of the sealing sleeve.
[0009] Preferably, the handle housing has a hollow groove inside, and the handle housing has a hollow structure.
[0010] By adopting the above technical solution, the hollow groove inside the handle shell makes it hollow, which reduces the heat conduction area between the handle and the door, reduces the cold bridge effect, and avoids the operator's gloves from freezing and sticking due to the excessively low surface temperature of the handle.
[0011] Preferably, a drainage groove is provided on the rear side of the mounting block, and the drainage groove forms a drainage structure for condensate.
[0012] Using the above technical solution, the drainage groove on the rear side of the mounting block can guide the condensate to flow along a preset path and be discharged, preventing the condensate from freezing at the connection between the door and the handle, and avoiding affecting the normal use of the handle due to icing.
[0013] Preferably, a sealing ring is provided on the front side of the mounting holes on both the left and right sides of the negative pressure door body, and the connecting pipe passes through the sealing ring and is connected to the rear side of the mounting block.
[0014] By adopting the above technical solution, the sealing ring on the front side of the mounting hole tightly wraps the connecting pipe, enhancing the sealing performance at the mounting hole of the door, preventing external hot air from entering the interior of the freezer, and reducing the loss of cold air.
[0015] Preferably, a spring is fixedly installed on the rear side of the mounting block, and the rear end of the spring is connected to the front side of the sealing ring, and the spring is located outside the connecting pipe.
[0016] Using the above technical solution, the spring on the back of the mounting block provides elastic support, ensuring that the sealing ring always fits tightly against the door surface and maintains the sealing performance. At the same time, the spring buffers and reduces operating resistance when opening the door.
[0017] Preferably, the connecting pipe is slidably connected inside the sealing sleeve.
[0018] The above technical solution allows the connecting pipe and the sealing sleeve to slide together, enabling the handle housing to move back and forth and providing mechanical space for the air pressure balance operation when the door is opened.
[0019] Preferably, the upper surface of the sealing sleeve has an opening, and the surface of the connecting pipe has an air hole, and the forward and backward movement of the connecting pipe constitutes an opening or closing structure for the air hole.
[0020] Using the above technical solution, the opening on the sealing sleeve is opened or closed by the movement of the connecting tube. When the door is opened, the connecting tube moves backward to connect the air hole and the opening, balance the air pressure inside and outside the freezer, reduce the negative pressure adsorption force, and make it easier to open the handle.
[0021] Compared with the prior art, the beneficial effects of this utility model are: the negative pressure door handle structure of this ultra-low temperature freezer,
[0022] 1. Anti-freeze and heat insulation design: The hollow structure of the handle shell reduces heat conduction and lowers the surface temperature. The drainage groove on the back of the mounting block can guide the condensate to flow along the preset path and be discharged, preventing the condensate from freezing at the connection between the door and the handle. This avoids affecting the normal use of the handle due to icing. The sealing ring and sealing sleeve block the cold bridge, preventing the handle from freezing and sticking to the gloves, and improving the safety of operation.
[0023] 2. Negative pressure balance and effortless opening: The upper surface of the sealing sleeve has an opening, and the forward and backward movement of the connecting tube forms an opening or closing structure for the opening. When the handle shell moves backward, it drives the connecting tube to work with the spring. When the door is opened, the connecting tube moves backward to open the opening, balances the air pressure inside and outside the freezer, overcomes the negative pressure suction force, and at the same time, the spring provides buffering assistance, reducing the opening force and making the operation more convenient. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of the ultra-low temperature freezer body of this utility model;
[0025] Figure 2 This is a schematic diagram of the overall installation structure of the handle shell of this utility model;
[0026] Figure 3 This is a schematic diagram of the overall exploded structure of the handle shell of this utility model;
[0027] Figure 4 This is a schematic diagram of the handle shell structure of this utility model;
[0028] Figure 5 This is a schematic diagram of the mounting block structure of this utility model;
[0029] Figure 6 This is a cross-sectional view of the sealing sleeve of this utility model.
[0030] In the diagram: 1. Handle housing; 2. Negative pressure door body; 3. Ultra-low temperature freezer body; 4. Empty slot; 5. Mounting block; 6. Drainage channel; 7. Sealing ring; 8. Connecting pipe; 9. Spring; 10. Sealing sleeve; 11. Opening; 12. Air hole. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0032] Please see Figure 1-6 This utility model provides a technical solution:
[0033] A negative pressure door handle structure for an ultra-low temperature freezer includes a handle housing 1, which is installed on the front side of a negative pressure door body 2. The rear side of the negative pressure door body 2 is hinged to the upper edge of the ultra-low temperature freezer body 3. Mounting holes are provided on the left and right sides of the front side of the negative pressure door body 2, and a connecting pipe 8 passes through the mounting holes. The connecting pipe 8 is connected to the rear side of the handle housing 1, and a mounting block 5 is provided at the front end of the connecting pipe 8. The front end of the mounting block 5 is connected to the left and right sides of the rear end of the handle housing 1. A sealing sleeve 10 is fixedly installed on the rear side of the mounting holes of the negative pressure door body 2, and the connecting pipe 8 passes through the interior of the sealing sleeve 10.
[0034] The handle housing 1 has a hollow groove 4 inside, and the handle housing 1 has a hollow structure. The mounting block 5 has a drainage groove 6 on the rear side, and the drainage groove 6 forms a drainage structure for condensate. The hollow groove 4 inside the handle housing 1 makes it a hollow structure, which reduces the heat conduction area between the handle and the door, reduces the cold bridge effect, and prevents the operator's gloves from freezing and sticking due to the excessively low surface temperature of the handle. The drainage groove 6 on the rear side of the mounting block 5 can guide the condensate to flow along a preset path and be discharged, preventing the condensate from freezing at the connection between the door and the handle, and avoiding the impact of icing on the normal use of the handle.
[0035] The negative pressure door body 2 has sealing rings 7 on the front of the mounting holes on both sides. The connecting pipe 8 passes through the sealing rings 7 and connects to the rear of the mounting block 5. A spring 9 is fixedly installed on the rear of the mounting block 5, and the rear end of the spring 9 is connected to the front of the sealing ring 7. The spring 9 is located outside the connecting pipe 8. The sealing ring 7 on the front of the mounting hole tightly wraps the connecting pipe 8, which enhances the sealing performance at the mounting hole of the door, prevents external hot air from entering the interior of the freezer, and reduces the loss of cold air. The spring 9 on the rear of the mounting block 5 provides elastic support, so that the sealing ring 7 always fits tightly against the surface of the door and maintains the sealing performance. At the same time, the spring 9 buffers and reduces the operating resistance when the door is opened.
[0036] The connecting pipe 8 is slidably connected to the inside of the sealing sleeve 10. The upper surface of the sealing sleeve 10 has an opening 11, and the surface of the connecting pipe 8 has an air hole 12. The forward and backward movement of the connecting pipe 8 forms an opening or closing structure for the air hole 12. The connecting pipe 8 is slidably connected to the sealing sleeve 10, allowing the handle housing 1 to move forward and backward, providing mechanical movement space for the air pressure balance operation when the door is opened. The opening 11 on the sealing sleeve 10 is opened or closed by the movement of the connecting pipe 8. When the door is opened, the connecting pipe 8 moves backward, so that the air hole 12 and the opening 11 are connected, balancing the air pressure inside and outside the freezer, reducing the negative pressure adsorption force, and making it easier to open the handle.
[0037] Working principle:
[0038] In use, under normal sealing conditions, the handle housing 1 is fixed to the front of the negative pressure door body 2 via the connecting pipe 8. The sealing ring 7 and the sealing sleeve 10 ensure a seal at the mounting hole, preventing cold loss and maintaining a tight seal between the door and the freezer body, thus maintaining a slight negative pressure inside the freezer. When the door is opened, the handle housing 1 is pushed back slightly, and the connecting pipe 8 slides back along the sealing sleeve 10. The spring 9 is further compressed and stores energy. When the connecting pipe 8 moves back to a certain position, the air hole 12 and the opening 11 connect, and external air enters the freezer through the opening 11, balancing the internal and external air pressure. At this time, the handle housing 1 provides an opening torque through the lever principle, overcoming the adhesive force of the door sealing strip, and easily opening the door. The condensate caused by the temperature difference between the inside and outside of the freezer gathers in the drainage groove 6 on the rear side of the mounting block 5 and is discharged to the outside of the door along the groove, preventing the condensate from freezing in a low-temperature environment and affecting the stability of the handle structure.
[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.
[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A negative pressure door handle structure for an ultra-low temperature freezer, comprising a handle housing (1), wherein the handle housing (1) is installed on the front side of a negative pressure door body (2), and the rear side of the negative pressure door body (2) is hinged to the upper edge of the ultra-low temperature freezer body (3), characterized in that: The negative pressure door body (2) has mounting holes on the left and right sides of the front side, and a connecting pipe (8) passes through the mounting holes. The connecting pipe (8) is connected to the rear side of the handle shell (1), and a mounting block (5) is provided at the front end of the connecting pipe (8). The front end of the mounting block (5) is connected to the left and right sides of the rear end of the handle shell (1). A sealing sleeve (10) is fixedly installed on the rear side of the mounting hole of the negative pressure door body (2), and the connecting pipe (8) passes through the inside of the sealing sleeve (10).
2. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 1, characterized in that: The handle housing (1) has a hollow groove (4) inside, and the handle housing (1) has a hollow structure.
3. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 1, characterized in that: The mounting block (5) has a drainage groove (6) on its rear side, and the drainage groove (6) forms a drainage structure for condensate.
4. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 1, characterized in that: The negative pressure door body (2) has sealing rings (7) on the front of the mounting holes on both sides, and the connecting pipe (8) passes through the sealing rings (7) and connects to the rear of the mounting block (5).
5. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 4, characterized in that: A spring (9) is fixedly installed on the rear side of the mounting block (5), and the rear end of the spring (9) is connected to the front side of the sealing ring (7), and the spring (9) is located outside the connecting pipe (8).
6. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 5, characterized in that: The connecting pipe (8) is slidably connected inside the sealing sleeve (10).
7. The negative pressure door handle structure of an ultra-low temperature freezer according to claim 6, characterized in that: The sealing sleeve (10) has an opening (11) on its upper surface, and the connecting pipe (8) has an air hole (12) on its surface. The forward and backward movement of the connecting pipe (8) forms an opening or closing structure for the air hole (12).