Ultralow-temperature storage cabinet

Abstract

The utility model belongs to the technical field of ultra-low temperature storage equipment, and discloses an ultra-low temperature storage cabinet which comprises an ultra-low temperature refrigerating unit and an ultra-low temperature box connected with the ultra-low temperature refrigerating unit, the ultra-low temperature box comprises a box body and a box body cover connected with the top of the box body, the box body cover covers the box body in a matched mode, a containing cavity is formed in the box body cover, and an evaporation box is embedded in the containing cavity. A plurality of layering plates are horizontally arranged in the evaporation box, vertical pipes are vertically inserted into the layering plates, and S-shaped refrigerant flow channels are formed between the layering plates and the inner wall of the evaporation box in an intermittent connection-disconnection mode and used for being filled with refrigerants. The ultra-low temperature storage cabinet (refrigeration house) is brand new in design, a cascade refrigerating unit is adopted as a cold source, the evaporation temperature is required to be about-80 DEG C, the core part of the ultra-low temperature storage cabinet is that a storage area where a vertical pipe is located is directly arranged in an ultra-low temperature refrigerant environment, the vertical pipe is a copper pipe or a stainless steel pipe, heat conduction is good, and heat transfer efficiency is high. The temperature of the storage region may be close to the evaporation temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-low temperature storage equipment, in particular to an ultra-low temperature storage cabinet. Background Art

[0002] Ultra-low temperature preservation refers to a refrigeration temperature range of -30℃~-86℃ or even lower. Ultra-low temperature refrigerators are devices for preserving DNA, vaccines and various biologically active substances. Conventional ultra-low temperature refrigerators mainly use electricity as energy to drive the refrigeration system composed of compressors, evaporators, condensers and refrigerants to achieve the refrigeration effect. R23, as a commonly used refrigerant, can produce an ultra-low temperature of -80℃ during the volatilization process. It is often used in the fields of medicine and biology to freeze vaccines and other biologically active substances in low temperature boxes.

[0003] Usually, the evaporator used for low-temperature storage adopts air-cooled forced convection or coil. In ultra-low temperature environment, the motor used for air-cooled forced convection is difficult to withstand ultra-low temperature environment and has a high failure rate. The coil evaporator has a low heat transfer coefficient and a slow cooling speed. In addition, the evaporation temperature of the commonly used evaporator needs to be 6 to 10K lower than the storage temperature. The existence of the heat transfer temperature difference reduces the efficiency of the refrigeration system and increases energy consumption.

[0004] Therefore, it is urgent to study a kind of ultra-low temperature storage cabinet. Utility Model Content

[0005] The present utility model provides an ultra-low temperature storage cabinet to solve the problems of low efficiency and high energy consumption of the refrigeration system in the prior art. In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A super-low temperature storage cabinet comprises a super-low temperature refrigeration unit and a super-low temperature box connected to the super-low temperature refrigeration unit, the super-low temperature box comprises a box body and a box cover connected to the top of the box body, the box cover cooperates with the box body and is formed with a receiving cavity, an evaporation box is embedded in the receiving cavity, a plurality of layered plates are horizontally arranged in the evaporation box, each layered plate is vertically inserted with a riser, and an S-shaped refrigerant flow channel is formed between each layered plate and the inner wall of the evaporation box in an intermittent connection-disconnection manner for filling the refrigerant.

[0008] The refrigerant of the ultra-low temperature refrigeration unit is connected to the ultra-low temperature box through pipelines, enters the refrigerant flow channel in the evaporator box, cools the riser, and then flows back to the ultra-low temperature refrigeration unit through pipelines, forming a refrigerant cycle.

[0009] Optionally, the riser and the layered plate are sealed by welding or tube expansion.

[0010] Optionally, the ultra-low temperature refrigeration unit is connected to the ultra-low temperature box via a pipeline, the pipeline is one or multiple pipelines connected in parallel, and an expansion valve is installed on each pipeline.

[0011] Optionally, the riser is a copper tube or a stainless steel tube, and the wall thickness of the riser is 0.8-1.5 mm.

[0012] Optionally, the riser surface is ribbed.

[0013] Optionally, the box body adopts a thermal insulation layer.

[0014] The technical solution provided by the embodiment of the utility model may have the following beneficial effects:

[0015] The utility model proposes a newly designed ultra-low temperature storage cabinet (cold storage). The cold source adopts a cascade refrigeration unit, and the evaporation temperature is required to be around -80°C. The core part is to place the storage area where the riser is located directly in the environment of ultra-low temperature refrigerant. The riser adopts copper tubes or stainless steel tubes with good heat conductivity and high heat transfer efficiency. The temperature of the storage area can be close to the evaporation temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0017] Figure 1 This is a schematic diagram of the overall structure of an ultra-low temperature storage cabinet of the utility model;

[0018] Figure 2 This is a top view of an ultra-low temperature storage cabinet of the utility model with the cabinet cover removed;

[0019] Figure 3 This is a schematic diagram of the refrigerant flow direction when the ultra-low temperature refrigeration unit of the utility model is connected to the ultra-low temperature box through a pipeline;

[0020] Figure 4 The utility model is a schematic diagram of the refrigerant flow direction when the ultra-low temperature refrigeration unit is connected to an ultra-low temperature box via multiple parallel pipelines.

[0021] Figure numerals: 1. ultra-low temperature refrigeration unit, 2. expansion valve, 3. box cover, 4. layer plate, 5. riser, 6. box, 7. evaporator box. DETAILED DESCRIPTION

[0022] The following description and the accompanying drawings fully illustrate the specific embodiments of this paper so that those skilled in the art can practice them. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. The scope of the embodiments herein includes the entire scope of the claims, and all available equivalents of the claims.

[0023] An ultra-low temperature storage cabinet, such as Figure 1 and 2 As shown, it includes an ultra-low temperature refrigeration unit 1 and an ultra-low temperature box connected to the ultra-low temperature refrigeration unit 1, the ultra-low temperature box includes a box body 6 and a box cover 3 connected to the top of the box body 6, the box cover 3 is matched to cover the box body 6 and is formed with a receiving cavity, an evaporation box 7 is embedded in the receiving cavity, a plurality of layered plates 4 are horizontally arranged in the evaporation box 7, each layered plate 4 is vertically inserted with a riser 5, and an S-shaped refrigerant flow channel is formed between each layered plate 4 and the inner wall of the evaporation box 7 in an intermittent connection-disconnection manner for filling the refrigerant.

[0024] The refrigerant of the ultra-low temperature refrigeration unit 1 is connected to the ultra-low temperature box through a pipeline, enters the refrigerant flow channel in the evaporation box 7, cools the riser 5, and then flows back to the ultra-low temperature refrigeration unit 1 through the pipeline, forming a refrigerant cycle.

[0025] Optionally, the riser 5 and the layered plate 4 are sealed by welding or tube expansion.

[0026] Optionally, the ultra-low temperature refrigeration unit 1 is connected to the ultra-low temperature box via a pipeline, the pipeline is one or multiple pipelines connected in parallel, and an expansion valve 2 is installed on each pipeline.

[0027] Optionally, the riser 5 is a copper tube or a stainless steel tube, the wall thickness of the riser is 0.8-1.5 mm, the heat transfer efficiency is high, and the temperature of the storage area of ​​the riser 5 is close to the evaporation temperature.

[0028] Optionally, the surface of the riser 5 is ribbed to increase the heat exchange area.

[0029] Optionally, the box body 6 adopts a heat-insulating layer.

[0030] In this embodiment, the riser 5 is an ultra-low temperature storage area, where test tube-like DNA or vaccines can be placed. The riser 5 and the layered plate 4 are closed and not connected to each other. The refrigerant runs in the refrigerant flow channel formed by the layered plate 4, absorbs heat, and cools the riser 5, which is equivalent to the riser 5 being surrounded by the refrigerant environment, and its surface surface is all refrigerant. The ultra-low temperature refrigeration unit 1 adopts a cascade type to achieve an evaporation temperature of about -80°C, and the storage area of ​​the riser 5 can be achieved at -70 to -75°C to meet the temperature requirements for storing DNA or vaccines. There are two ways to implement the cascade unit: one is to divide the total temperature difference into two or more sections, and the high temperature stage bears the condensation load of the low temperature stage to achieve an evaporation temperature of -80°C or below, that is, using two or more stages of cascade; the second is to adopt a refrigerant self-cascade solution. In actual operation, choose according to actual conditions.

[0031] In this embodiment, the refrigerant is R23. Figure 3 and 4 As shown, the expansion of the refrigerant can be one way or multiple ways in parallel to achieve uniform evaporation. The refrigerant flow diagram shows downstream, and countercurrent heat exchange can also be used in the cabinet (cold storage). The ultra-low temperature box is generally placed in a conventional cold storage environment (-22 to -25°C). The box cover 3 is preferably opened electrically, and a manipulator is generally used to take and place items. Manual operation is generally not recommended in an ultra-low temperature environment. If the ultra-low temperature box is small in size, the thickness of the box insulation layer can be increased to reduce heat transfer. After the thickness of the insulation layer is increased, the ultra-low temperature box can be placed in an air-conditioned environment and does not need to be placed in a conventional cold storage (-22 to -25°C).

[0032] The present invention is not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An ultra-low temperature storage cabinet, characterized in that: It includes an ultra-low temperature refrigeration unit and an ultra-low temperature box connected to the ultra-low temperature refrigeration unit. The ultra-low temperature box includes a box body and a box cover connected to the top of the box body. The box cover is fitted on the box body and is formed with a accommodating cavity. An evaporator box is embedded in the accommodating cavity. A plurality of layered plates are horizontally arranged in the evaporator box. A riser is vertically inserted on each layered plate. An S-shaped refrigerant flow channel is formed between each layered plate and the inner wall of the evaporator box in an intermittent connection-disconnection manner for filling the refrigerant.

2. An ultra-low temperature storage cabinet as claimed in claim 1, characterized in that: The vertical pipe and the layered plate are sealed by welding or tube expansion.

3. The ultra-low temperature storage cabinet according to claim 1, characterized in that: The ultra-low temperature refrigeration unit is connected to the ultra-low temperature box via pipelines, the pipelines are one or more pipelines connected in parallel, and an expansion valve is installed on each pipeline.

4. The ultra-low temperature storage cabinet according to claim 1, characterized in that: The vertical pipe is a copper pipe or a stainless steel pipe, and the wall thickness of the vertical pipe is 0.8-1.5 mm.

5. The ultra-low temperature storage cabinet according to claim 1, characterized in that: The surface of the riser is ribbed.

6. The ultra-low temperature storage cabinet according to claim 1, characterized in that: The box body adopts a heat-insulating layer.

Images