Low-temperature preservation box and pressure balancing method

Abstract

The invention discloses a low-temperature preservation box and a pressure balancing method. The low-temperature preservation box comprises a detection hole formed in a box body and further comprises a sealing device for controlling the detection hole to be opened and closed, a sealing cover for shielding the sealing hole through the sealing device and an opening and closing mechanism for controlling the sealing cover to move. An original detection hole structure of the low-temperature preservation box is utilized, an original detection hole rubber plug is replaced with the sealing cover with a certain heat preservation effect, the internal pressure and the external pressure of the preservation box are balanced through the detection hole, an electric heating balance device does not need to be independently arranged, energy consumption is reduced, and cold leakage is reduced. The door opening action is detected and judged, starting of a transmission sealing device is controlled through a set control method, the pressure balancing efficiency is improved, cold leakage is reduced, the structure is simple, and the sealing device can be additionally arranged beside a back detection hole.

Description

Technical Field

[0001] The present invention relates to the technical field of preservation boxes, and in particular to a low-temperature preservation box and a pressure balancing method. Background Art

[0002] With the development of science and technology, low-temperature refrigeration technology has been gradually improved. Among them, the cascade refrigeration system has gradually come into the public eye due to its lower low temperature environment and higher refrigeration efficiency. In the field of medical and health care, ultra-low temperature preservation boxes using cascade systems are widely used, but because the working temperature of the ultra-low temperature preservation box is very low during use (as low as -164°C), the pressure difference between the inside and outside of the box is extremely large, and a pressure balance device is required to open the door.

[0003] The existing solution is to install an electric heating balancing device on the door of the ultra-low temperature preservation box to balance the pressure through the combined action of electric heating and a one-way valve. However, this method has high energy consumption and requires reserved installation space for the electric heating balancing device on the door, which will reduce the insulation layer and increase cold leakage. Summary of the invention

[0004] In order to solve the pressure balance problem of a low-temperature preservation box, the present invention proposes a low-temperature preservation box, which uses a sealing device to control the opening and closing of a detection hole on the preservation box to achieve internal and external pressure balance control of the preservation box, thereby facilitating the opening of the box door, and further provides a pressure balance method.

[0005] The technical solution adopted by the present invention is to design a low-temperature storage box, including a detection hole set on the box body, a sealing device for controlling the on-off of the detection hole, a sealing cover of the sealing hole covered by the sealing device, and an opening and closing mechanism for controlling the movement of the sealing cover.

[0006] In some embodiments, the opening and closing mechanism includes a motor disposed on the box body and a transmission shaft connecting the motor and the sealing cover, and the motor controls the movement of the sealing cover relative to the detection hole through the transmission shaft.

[0007] In some embodiments, the motor shaft is perpendicular to the axial direction of the detection hole, and the rotation of the motor causes the sealing cover to flip relative to the surface of the box body.

[0008] In some embodiments, the motor shaft is parallel to the axial direction of the detection hole, and the rotation of the motor causes the sealing cover to move parallel to the surface of the box body.

[0009] In some embodiments, the sealing cover is made of elastic material.

[0010] In some embodiments, it also includes an opening and closing detection device for detecting whether a door opening action occurs, and the opening and closing detection device is used to detect whether a door lock on the box door is turned. The door opening mechanism controls the sealing state of the sealing cover according to the detection information of the opening and closing detection device.

[0011] In some embodiments, the opening and closing detection device is a tilt sensor provided on the door lock.

[0012] In some embodiments, an opening and closing detection device is further included on the door, and the opening and closing detection device is used to detect the opening and closing state of the door. The opening and closing mechanism controls the sealing state of the sealing cover according to the detection information of the opening and closing detection device.

[0013] In some embodiments, the opening and closing detection device is a door magnetic sensor arranged between the door body and the door frame.

[0014] In some embodiments, a temperature difference detection device is further included for detecting the temperature difference between the inside and outside of the storage box. A plurality of detection holes are provided on the box body. The opening and closing mechanism controls the opening amount of the sealing cover according to the temperature difference detected by the temperature difference detection device.

[0015] The pressure balancing method is used for the low-temperature storage box. If a door opening action is detected, the sealing cover is opened; if it is detected that the box door has been opened, the sealing cover is closed.

[0016] The pressure balancing method is used for the low-temperature preservation box, and a plurality of detection holes are provided on the box body. If it is detected that the temperature difference between the inside and outside of the preservation box is less than the set temperature difference T, one of the sealing covers is opened; if it is detected that the temperature difference between the inside and outside of the preservation box is greater than the set temperature difference T, at least two of the sealing covers are opened.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention utilizes the original detection hole structure of the low-temperature preservation box, replaces the original detection hole rubber plug with a sealing cover with a certain heat preservation effect, balances the pressure inside and outside the preservation box through the detection hole, and does not need to set up an electric heating balance device separately, thereby reducing energy consumption and reducing cold leakage. The door opening action is detected and judged, and the start of the transmission sealing device is controlled by setting a control method, thereby improving the pressure balance efficiency and reducing cold leakage. The structure is simple and can be achieved by only adding a sealing device next to the back detection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0020] Figure 1 This is a schematic diagram of a low-temperature storage box.

[0021] Figure 2 It is a cross-sectional schematic diagram of a low-temperature storage box.

[0022] Figure 3 It is a side view of the low-temperature storage box provided with a detection hole according to the first embodiment.

[0023] Figure 4 It is a schematic diagram of the sealing cover of the first embodiment covering the detection hole.

[0024] Figure 5 It is a schematic diagram of the sealing cover of the first embodiment opening the detection hole.

[0025] Figure 6 A side view of a low-temperature storage box provided with a detection hole according to the second embodiment.

[0026] Figure 7 It is a schematic diagram of the sealing cover of the second embodiment covering the detection hole.

[0027] Figure 8 It is a schematic diagram of the sealing cover of the second embodiment opening the detection hole.

[0028] Fig. 9 It is a flow chart of the pressure balance method.

[0029] In the figure, 1. box body; 2. box door; 3. LCD screen; 4. door lock; 5. mechanical room; 6. tilt sensor; 7. insulation layer; 8. detection hole; 9. sealing cover; 10. opening and closing mechanism; 101. motor; 102. transmission shaft; 11. door magnetic sensor. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solutions of the invention.

[0031] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0032] Embodiment 1

[0033] An ultra-low temperature preservation box is a device specially designed for storing biological samples, drugs, vaccines or experimental materials under extremely low temperature conditions (usually -40℃ to -150℃). It is widely used in medicine, scientific research, biopharmaceuticals and the food industry, especially when samples of high value or sensitivity need to be preserved for a long time. With the development of science and technology, low-temperature refrigeration technology has gradually been improved. Among them, the cascade refrigeration system has gradually come into the public eye due to its lower low temperature environment and higher refrigeration efficiency. In the field of medical and health care, ultra-low temperature preservation boxes using cascade systems are widely used, but because the operating temperature of the ultra-low temperature preservation box is very low during use (as low as -164℃), the pressure difference between the inside and outside of the box is extremely large, and a pressure balance device is required to open the door.

[0034] After the ultra-low temperature storage box is closed, the extremely low temperature inside the box may cause negative pressure, making it difficult to open the door. This is because the air inside the box contracts when the temperature drops, causing the pressure inside the box to be lower than the external pressure.

[0035] The existing solution is to install an electric heating balancing device on the door of the ultra-low temperature preservation box, and use heating to balance the pressure inside and outside the ultra-low temperature preservation box. The core principle of this method is to heat the sealing strip or a local area of ​​the door to make the air in the box expand slightly, thereby reducing the pressure difference between the inside and outside of the box. However, this method has high energy consumption and requires reserving installation space for the electric heating balancing device on the door, which will reduce the insulation layer and increase cold leakage.

[0036] like Figure 1 , 2 As shown, the low temperature storage box includes a detection hole 8 arranged on the box body 1, a sealing device for controlling the opening and closing of the detection hole 8, a sealing cover 9 for covering the sealing hole by the sealing device, and an opening and closing mechanism 10 for controlling the movement of the sealing cover 9. The detection hole 8 passes through the heat preservation layer 7 of the box body 1. A mechanical room 5 for accommodating refrigeration equipment is arranged at the bottom of the box body 1.

[0037] like Figure 3 , 4 As shown in Figure 5, a transmission sealing device is installed next to the back detection hole 8 of the ultra-low temperature preservation box. The sealing device includes an opening and closing mechanism 10 and a sealing cover 9. The pressure in the preservation box is balanced by opening and closing the sealing cover 9, so that the user can easily open the box door 2 to store and retrieve items.

[0038] The opening and closing mechanism 10 includes a motor 101 arranged on the box body 1 and a transmission shaft 102 connecting the motor 101 and the sealing cover 9. The motor 101 controls the movement of the sealing cover 9 relative to the detection hole 8 through the transmission shaft 102, thereby realizing the opening or closing of the detection hole 8. When opening, the inside and outside of the box body 1 are connected, so that the internal and external pressures are equal, which facilitates the opening of the box door 2.

[0039] The motor 101 shaft is perpendicular to the axial direction of the detection hole 8, and the motor 101 rotates to flip the sealing cover 9 relative to the surface of the box body 1. That is, the motor 101 rotates 180 degrees to flip the sealing cover 9, so that the sealing cover 9 quickly leaves or snaps on the detection hole 8.

[0040] The sealing cover 9 is made of elastic material. The sealing cover 9 is made of elastic material with a certain heat preservation effect, which can completely and tightly cover the detection hole 8 to reduce cold leakage.

[0041] It also includes an opening and closing detection device for detecting whether the door opening action occurs or not, and the opening and closing detection device is used to detect whether the door lock 4 on the box door 2 is rotated. The door opening mechanism controls the sealing state of the sealing cover 9 according to the detection information of the opening and closing detection device.

[0042] The inclination sensor 6 is used to predict whether the user has the door opening action (the user must first turn the door lock 4 when opening the door) so that the door opening mechanism controls the opening and closing of the sealing cover 9, allowing the user to easily open the box door 2 to store and access items.

[0043] The opening and closing detection device is an inclination sensor 6 arranged on the door lock 4. The inclination sensor 6 has a simple structure and is easy to use.

[0044] The inclination sensor is a device used to measure the inclination angle of an object, which can sense the change of the object's gravity direction relative to the ground. It is widely used in industries such as industry, automobiles, aerospace, construction, medical, consumer electronics, etc. to monitor the posture, angle change and horizontal state of the equipment. It is a clever solution to use the inclination sensor to detect whether the door lock has a door opening action. The inclination sensor can determine whether the door opening action has occurred by sensing the change in the inclination angle of the door or door lock. This method is suitable for scenarios where the inclination angle of the door body changes significantly, such as the initial inclination change of a revolving door, a flip door or a sliding door. The inclination sensor is installed on the door lock or the door body. When the door rotates, flips or slides, the inclination sensor can detect the angle change and convert it into an electrical signal output. By monitoring the angle change in real time, it can be determined whether the door is in the open or closed state. The door opening action causes the inclination angle of the door lock or door body to change significantly (for example, from 0° to 10° or more). By setting the angle threshold, small-range angle changes caused by slight shaking or other factors can be filtered out to avoid misjudgment.

[0045] It also includes an opening and closing detection device disposed on the door 2, which is used to detect the opening and closing state of the door 2. The opening and closing mechanism 10 controls the sealing state of the sealing cover 9 according to the detection information of the opening and closing detection device. The opening and closing detection device is used to confirm whether the door 2 is open. If the user only turns the door lock 4 without opening the door 2, the sealing cover 9 will be opened and then immediately closed to reduce cold leakage.

[0046] The opening and closing detection device is a door magnetic sensor 11 arranged between the door body and the door frame. The door magnetic sensor 11 has a simple structure and is easy to use.

[0047] The door magnetic sensor is a sensor commonly used for door and window security detection, usually used to monitor whether the door and window are opened. It triggers alarms or links other devices by sensing the open and closed states of doors and windows, and is a common security device. The working principle of the door magnetic sensor is based on the principle of magnetic induction. When the door is closed, the magnet and the sensor are in close or direct contact. The sensor is usually in the closed state because the magnetic field interference keeps the switch inside the Hall effect sensor in the "off" state. When the door is opened, the magnet moves away from the sensor, the switch state inside the sensor changes, and the loss of the magnetic field is sensed, so it switches to the "on" state and sends a switch signal.

[0048] The storage box also includes a temperature difference detection device for detecting the temperature difference between the inside and outside of the storage box. The box body 1 is provided with a plurality of detection holes 8. The opening and closing mechanism 10 controls the opening amount of the sealing cover 9 according to the temperature difference detected by the temperature difference detection device. Therefore, when the temperature difference between the inside and outside of the low-temperature storage box is small, only a little ventilation is needed to balance the pressure and open the box door 2.

[0049] like Fig. 9 As shown, if a door opening action is detected, the sealing cover 9 is opened; if it is detected that the box door 2 has been opened, the sealing cover 9 is closed. The specific control is as follows:

[0050] If the inclination angle of the door lock is detected to be θ≥θ1, the sealing cover is opened to balance the pressure inside and outside the preservation box through the detection hole; if the inclination angle of the door lock is detected to be θ≥θ1 and the ultra-low temperature preservation box door is not opened, the sealing cover is in the open state until the preservation box door is opened and the sealing cover is closed. If the inclination angle of the door lock is detected to be θ<θ1 and the ultra-low temperature preservation box door is opened, or the inclination angle of the door lock is detected to be θ≥θ1 and the ultra-low temperature preservation box door is opened, the sealing cover is closed to seal the detection hole tightly to reduce cold leakage.

[0051] The box body is provided with a plurality of detection holes. If it is detected that the temperature difference between the inside and outside of the preservation box is less than the set temperature difference T, one of the sealing covers is opened; if it is detected that the temperature difference between the inside and outside of the preservation box is greater than the set temperature difference T, at least two of the sealing covers are opened.

[0052] Number of Sealing Cover Openings and Ambient Temperature T a and the temperature inside the box T d When the temperature difference between the inside and outside of the low-temperature storage box is small, only a little ventilation is needed to balance the pressure and open the door, that is, when T a -T d When <T, open a sealing cover; when T a -T d When ≥T, both sealing covers are open. In particular, as long as the ultra-low temperature storage chamber door is open, the sealing covers are closed.

[0053] In addition, the user can also customize the pressure balance time through the LCD display 3 according to the user's actual usage, ensuring that the user can easily open the box door to store and retrieve items.

[0054] Embodiment 2

[0055] like Figure 6 , 7 8, different from the above embodiments, the motor 101 shaft is parallel to the axial direction of the detection hole 8, and the motor 101 rotates so that the sealing cover 9 moves parallel to the surface of the box body 1. That is, the motor 101 and part of the transmission shaft 102 of this embodiment are arranged on the inner side of the back plate of the box body 1, and part of the transmission shaft 102 and the sealing cover 9 are arranged on the outer side of the back plate of the box body 1, and can rotate 360° with the motor shaft, and the specific position is not limited.

[0056] The detection hole (also called test hole or sampling hole) of the ultra-low temperature preservation box is an opening specially designed for external equipment interface, data acquisition or environmental monitoring. It can perform temperature monitoring, sensor arrangement, or gas injection without frequent opening and closing of the box door, thereby avoiding temperature fluctuations and improving the stability of the preservation box.

[0057] Using the detection hole of the ultra-low temperature preservation box to balance the pressure inside and outside the box is an economical and effective solution, especially suitable for equipment that is not equipped with an automatic pressure balancing valve. The negative pressure phenomenon in the ultra-low temperature preservation box is usually caused by the cold shrinkage effect, that is, the volume of the air in the box shrinks when the temperature drops, generating negative pressure. If the outside air is properly introduced through the detection hole, the pressure inside and outside the box can be quickly balanced, solving the problem of difficulty in opening the door. Setting a control valve on the pressure detection hole of the ultra-low temperature preservation box is a scientific and effective way to control the connection of the pressure inside and outside the box. By manually or automatically adjusting the control valve, the pressure inside and outside the box can be quickly balanced when needed, thereby solving the problem of difficulty in opening the door caused by negative pressure. Using a sealing cover covering the detection hole and controlling the opening and closing of the sealing cover by a motor is an intelligent solution that can improve the efficiency of the ultra-low temperature preservation box in terms of operational convenience, sealing performance and automatic control. This design combines mechanical sealing and automatic control technology and is suitable for scenarios where the pressure inside and outside the box needs to be adjusted frequently. The two methods of using the flip opening or translation opening of the sealing cover on the detection hole have their own advantages. The specific choice can be optimized according to actual needs, equipment structure and operating habits.

[0058] The flip-open sealing cover has a simple structure, flips around a fixed axis, and has low design and manufacturing costs.

[0059] The flip-open sealing cover saves space, and the flip angle can be limited to a certain range, without taking up too much surrounding space. The flip-open sealing cover is suitable for small detection holes, especially for scenes with small detection holes (diameter <10cm). The motor controls the sealing cover to flip from "closed" to "open", and the opening angle is adjustable. In other words, the flip-open sealing cover has the characteristics of simple design, high reliability, controllable flip angle, suitable for small equipment, small motor driving force, and low energy consumption.

[0060] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0061] Although some terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention. The execution order of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar sequential terms (for example, "first", "next", "secondly", "again", "then", etc.) used for the convenience of description do not mean that they must be implemented in such an order.

[0062] It should be understood by those skilled in the art that all directional references (for example, above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to facilitate the reader's understanding, and do not represent limitations (for example, on position, orientation or use, etc.) on the scope of the invention as defined by the appended claims. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or slight deviations of conditions, quantities, values, or dimensions, some of which are within the manufacturing deviation or tolerance range. It should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of this application.

Claims

1. A low temperature storage box, comprising a detection hole arranged on the box body, characterized in that: It also includes a sealing device for controlling the on / off state of the detection hole, a sealing cover for covering the sealing hole, and an opening and closing mechanism for controlling the movement of the sealing cover.

2. The low temperature storage box according to claim 1, characterized in that: The opening and closing mechanism includes a motor arranged on the box body and a transmission shaft connecting the motor and the sealing cover, and the motor controls the movement of the sealing cover relative to the detection hole through the transmission shaft.

3. The low temperature storage box according to claim 2, characterized in that: The motor shaft is perpendicular to the axial direction of the detection hole, and the motor rotates to cause the sealing cover to flip relative to the surface of the box body.

4. The low temperature storage box according to claim 2, characterized in that: The motor shaft is parallel to the axial direction of the detection hole, and the rotation of the motor causes the sealing cover to move parallel to the surface of the box body.

5. The low temperature storage box according to claim 1, characterized in that: The sealing cover is made of elastic material.

6. The low temperature storage box according to claim 1, characterized in that: It also includes an opening and closing detection device for detecting whether the door opening action occurs or not. The opening and closing detection device is used to detect whether the door lock on the box door is turned. The door opening mechanism controls the sealing state of the sealing cover according to the detection information of the opening and closing detection device.

7. The low temperature storage box according to claim 6, characterized in that: The opening and closing detection device is a tilt sensor arranged on the door lock.

8. The low temperature storage box according to claim 1, characterized in that: It also includes an opening and closing detection device arranged on the box door, the opening and closing detection device is used to detect the opening and closing state of the box door, and the opening and closing mechanism controls the sealing state of the sealing cover according to the detection information of the opening and closing detection device.

9. The low temperature storage box according to claim 8, characterized in that: The opening and closing detection device is a door magnetic sensor arranged between the door body and the door frame.

10. The low temperature storage box according to claim 1, characterized in that: It also includes a temperature difference detection device for detecting the temperature difference between the inside and outside of the preservation box. The box body is provided with a plurality of detection holes. The opening and closing mechanism controls the opening amount of the sealing cover according to the temperature difference detected by the temperature difference detection device.

11. A pressure balancing method for a low temperature storage box as claimed in any one of claims 1 to 10, characterized in that: If a door opening action is detected, the sealing cover is opened; if it is detected that the box door has been opened, the sealing cover is closed.

12. A pressure balancing method for a low temperature storage box as claimed in any one of claims 1 to 10, characterized in that: The box body is provided with a plurality of detection holes. If it is detected that the temperature difference between the inside and outside of the preservation box is less than the set temperature difference T, one of the sealing covers is opened; if it is detected that the temperature difference between the inside and outside of the preservation box is greater than the set temperature difference T, at least two of the sealing covers are opened.

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