Refrigerator pressure relief structure and refrigerator

Abstract

The present invention provides a refrigerator pressure relief structure, including a spring pressure relief valve and a rotating shaft pressure relief valve arranged in a refrigerator door shell; wherein the spring pressure relief valve drives an elastic valve ball to block or connect a first pressure relief channel through the spring force, so as to achieve pressure balance inside and outside the refrigerator after closing the door; the rotating shaft pressure relief valve includes a sleeve assembly and a rotating shaft located in the sleeve assembly; one end of the rotating shaft is connected to a rotating handle of the door body, and the rotating handle is rotated to rotate the rotating shaft in the sleeve assembly to different positions to close or connect a second pressure relief channel, so as to achieve pressure balance inside and outside the refrigerator when opening the door. The present invention also provides a refrigerator including the above-mentioned pressure relief structure. The present invention coordinately controls the pressure balance after closing and opening the refrigerator door by simultaneously arranging a spring pressure relief valve and a rotating shaft pressure relief valve linked with the handle, so as to achieve convenient and fast door opening and no cold leakage or frost around the pressure relief valve.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator pressure relief structure and a refrigerator. Background Art

[0002] The refrigerator cavity is a low-temperature area. As the temperature inside the box drops, the pressure gradually decreases, forming a pressure difference between the inside and outside of the box, making it difficult to open the door, or even impossible to open. This is especially true for ultra-low temperature refrigerators. In order to facilitate door opening, the pressure inside and outside the refrigerator needs to be balanced, usually using "manual pressure relief" or "mechanical automatic pressure relief".

[0003] "Manual pressure relief" effectively seals the pressure relief channel, which makes it difficult for frost to form inside the box, has low energy consumption, a simple structure and low cost, but it is cumbersome to operate. When releasing pressure, you need to rotate the hole plug or continuously press the button, which makes it difficult to complete the pressure relief action with one hand.

[0004] "Automatic pressure relief mechanism" is the main measure currently adopted by ultra-low temperature refrigerator products. It mainly uses a spring pressure relief valve for automatic pressure relief. It has a simple structure, low cost, and does not require separate operation. However, in order to meet the automatic pressure relief function, the refrigerator's pressure relief valve has weak elasticity and is very easy to be loosely sealed, resulting in frost in the box. Long-term operation may even cause the valve body to freeze and the door cannot be opened. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a new type of refrigerator pressure relief structure and a refrigerator, by simultaneously arranging a spring pressure relief valve and a rotating shaft pressure relief valve linked to the handle to coordinately control the pressure balance after the refrigerator door is closed and when the door is opened, thereby achieving convenient and fast door opening and no cold leakage or frost around the pressure relief valve.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A refrigerator pressure relief structure comprises a spring pressure relief valve and a rotating shaft pressure relief valve arranged in a refrigerator door shell; wherein, the spring pressure relief valve drives an elastic valve ball to block or connect a first pressure relief channel through the spring force, thereby achieving pressure balance inside and outside the refrigerator after the door is closed; the rotating shaft pressure relief valve comprises a sleeve assembly and a rotating shaft located in the sleeve assembly; one end of the rotating shaft is connected to a door body rotating handle, and the rotating handle is rotated to rotate the rotating shaft in the sleeve assembly to different positions to close or connect a second pressure relief channel, thereby achieving pressure balance inside and outside the refrigerator when the door is opened.

[0008] The present invention coordinately controls the pressure balance after the refrigerator door is closed and when the door is opened by simultaneously providing a spring pressure relief valve and a rotating shaft pressure relief valve linked with the handle, thereby realizing convenient and rapid door opening and preventing cold leakage and frost formation around the pressure relief valve. Among them, the spring pressure relief valve is used to control the internal and external pressure difference after the refrigerator door is closed, which can avoid deformation of the door body and door seal caused by excessive pressure difference. The rotating shaft pressure relief valve drives the rotating shaft to rotate by rotating the rotating handle when opening the door, so that the rotating shaft and the sleeve form a continuous and stable pressure relief channel due to the change in relative position, thereby achieving the effect of fully and rapidly balancing the pressure difference; when closing the door, the handle is used to reset it, that is, the pressure relief channel is closed, and no additional operation steps are added to the user.

[0009] As one of the preferred embodiments of the present invention, a channel A is formed inside the sleeve assembly, and a channel B is formed inside the rotating shaft; when the rotating shaft rotates in the sleeve assembly with the rotating handle to a position where the channel B is connected to the channel A, the second pressure relief channel is quickly connected.

[0010] As one of the preferred embodiments of the present invention, the sleeve assembly includes a first air duct, a sleeve and a second air duct; the first air duct is connected to the air vent A on the inner side of the door body, and the other end thereof is connected to the sleeve; the sleeve is fixed to the refrigerator door body, a rotating shaft is accommodated in the sleeve, a second air duct is connected to the outside of the sleeve, and a terminal end of the second air duct is connected to the outer side of the door body; a "Z"-shaped channel A is formed between the internal pipes of the first air duct, the sleeve and the second air duct.

[0011] As one of the preferred embodiments of the present invention, the end of the sleeve away from the first air duct is connected to a C-shaped plate; the C-shaped plate is fixed to the inner end of the refrigerator door shell, and the sleeve is installed and fixed to the corresponding position of the refrigerator door body through the C-shaped plate.

[0012] As one of the preferred embodiments of the present invention, an air guide groove is provided on one end of the rotating shaft close to the first air guide pipe, and an air guide port is provided on the outer wall of the rotating shaft corresponding to the air guide groove; the air guide groove is connected to the air guide port to form an "L"-shaped channel B.

[0013] As one of the preferred embodiments of the present invention, when the rotating shaft rotates in the sleeve, the air guide port on the rotating shaft rotates accordingly; when the air guide port rotates to a position connected with the second air guide pipe, channel B is connected to channel A to form a continuous second pressure relief channel, thereby achieving the effect of fully and quickly balancing the pressure difference.

[0014] As one of the preferred embodiments of the present invention, the spring pressure relief valve and the shaft pressure relief valve are respectively provided with heating structures for heating the corresponding pressure relief valves.

[0015] As one of the preferred embodiments of the present invention, the heating structure is a heater or a heating wire; when the heating structure is a heater, the heater is arranged in the pipeline of the spring pressure relief valve and the rotating shaft pressure relief valve; when the heating structure is a heating wire, the heating wire is wrapped around the outside of the pipeline of the spring pressure relief valve and the rotating shaft pressure relief valve.

[0016] As one of the preferred embodiments of the present invention, the spring force of the spring pressure relief valve is greater than or equal to 4.13N (the spring force is greater than that of a conventional spring pressure relief valve), and the diameter of the first pressure relief channel is 16.2mm; the diameter of the second pressure relief channel of the shaft pressure relief valve is 10mm.

[0017] A refrigerator comprises the above-mentioned refrigerator pressure relief structure.

[0018] The advantages of the refrigerator and the above-mentioned refrigerator pressure relief structure over the prior art are the same, which will not be repeated here.

[0019] Beneficial effects:

[0020] (1) The present invention simultaneously provides a spring pressure relief valve and a rotating shaft pressure relief valve linked with the handle to coordinately control the pressure balance after the refrigerator door is closed and when the door is opened, thereby realizing convenient and fast door opening and preventing cold leakage and frost formation around the pressure relief valve; wherein the spring pressure relief valve is used to control the internal and external pressure difference after the refrigerator door is closed, thereby avoiding deformation of the door body and door seal caused by excessive pressure difference; the rotating shaft pressure relief valve drives the rotating shaft to rotate by rotating the rotating handle when the door is opened, so that the air guide port on the rotating shaft is connected to the second air guide pipe of the sleeve, thereby forming a continuous and stable second pressure relief channel (the traditional spring pressure relief valve for door opening pressure relief, whose channel will decrease as the pressure difference decreases, is unstable, and will make the pressure relief slower and slower), thereby achieving the effect of fully and quickly balancing the pressure difference; when closing the door, the handle is rotated to reset it, that is, the pressure relief channel is closed, and no additional operation steps are added to the user;

[0021] (2) The elastic force of the existing spring pressure relief valve is relatively weak, usually between 1 and 5 N. If the elastic force is too small, the spring pressure relief valve will repeatedly operate with the temperature changes caused by the start and stop of the compressor, causing severe cold leakage and frosting. If the elastic force is too large, it is easy to cause the automatic pressure relief valve to have a large pulling force to open the door. At the same time, since the pressure relief channel of the spring pressure relief valve will also decrease as the pressure difference between the inside and outside of the box decreases, the waiting interval for continuous door opening will be relatively long.

[0022] In the present invention, since the spring pressure relief valve is not directly used for pressure relief and door opening, the elastic force can be designed to be relatively sufficient, for example, "greater than or equal to 4.13N", and the situation where the spring pressure relief valve has a weak elastic force and keeps moving with the temperature fluctuation in the box will not occur; at the same time, the air intake of the shaft pressure relief valve when opening the door can be greatly reduced, thereby reducing the waiting time for opening the door;

[0023] (3) The action of the rotary shaft pressure relief valve of the present invention is the rotation of the shaft surface, which is almost unaffected by the pressure difference between the inside and outside of the box, thus ensuring the reliable operation of the valve body; at the same time, after the rotary shaft pressure relief valve is linked with the rotating handle, the door opening force is relatively comfortable through the lever principle of the rotating handle;

[0024] (4) The spring pressure relief valve and the shaft pressure relief valve of the present invention can be fully sealed, and there is no need to increase the heating power compared to the conventional spring pressure relief valve. At the same time, because the heating structure of the present invention does not need to be heated continuously, heating for about 3 minutes every 5 minutes can maintain the activity and permeability of the pressure relief channel, which can further reduce the energy consumption of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the refrigerator pressure relief structure in Example 1;

[0026] Figure 2 is a partial cross-sectional structural diagram of the refrigerator pressure relief structure in Example 1;

[0027] Figure 3 yes Figure 2 A magnified view of the structure of the middle part A;

[0028] Figure 4 is another partial cross-sectional structural diagram of the refrigerator pressure relief structure in Example 1;

[0029] Figure 5 yes Figure 4 A magnified view of the structure of the middle B section;

[0030] Figure 6 This is a diagram showing the air vents on the inner side of the refrigerator door in Example 1;

[0031] Figure 7 is a schematic diagram of the disassembled structure of the rotating shaft pressure relief valve in Example 1;

[0032] Figure 8 is a structural diagram of the rotating shaft pressure relief valve in the open state in the first embodiment;

[0033] Fig. 9 yes Figure 8 Cross-sectional structural diagram;

[0034] Fig.10 is a diagram showing the positions of the sleeve and the rotating shaft in the connected state in Example 1;

[0035] Fig.11 is a structural diagram of the rotating shaft pressure relief valve in the closed state in Example 1;

[0036] Fig.12 This is a position display diagram of the sleeve and the rotating shaft in Example 1 when they are not connected.

[0037] In the figure: 100 is a refrigerator, 101 is a door body, 102 is a door shell, 103 is a rotary handle, 1 is a spring pressure relief valve, 11 is a spring, 12 is an elastic valve ball, 13 is a first pressure relief channel, 14 is an air vent B, 2 is a shaft pressure relief valve, 21 is a sleeve assembly, 211 is a first air guide pipe, 212 is a sleeve, 213 is a second air guide pipe, 214 is an air vent A, 215 is a C-type plate, 22 is a shaft, 221 is an air guide groove, 222 is an air guide port, 23 is a second pressure relief channel, and 3 is a heating wire. DETAILED DESCRIPTION

[0038] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0039] Example 1

[0040] See also Figure 1-12 :A refrigerator pressure relief structure of this embodiment includes a spring pressure relief valve 1 and a shaft pressure relief valve 2 arranged in the door shell 102 of the refrigerator 100. Among them, the spring pressure relief valve 1 drives the elastic valve ball 12 to block or connect the first pressure relief channel 13 through the elastic force of the spring 11, so as to achieve the pressure balance inside and outside the refrigerator 100 after the door is closed. The shaft pressure relief valve 2 includes a sleeve assembly 21 and a shaft 22 located in the sleeve assembly 21; one end of the shaft 22 is fixedly connected to the rotating handle 103 on the door body 101, and the rotating handle 103 is rotated to rotate the shaft 22 to different positions in the sleeve 212 of the sleeve assembly 21 to close or connect the second pressure relief channel 23, so as to achieve the pressure balance inside and outside the refrigerator 100 when the door is opened.

[0041] This embodiment simultaneously provides a spring pressure relief valve 1 and a rotating shaft pressure relief valve 2 linked with the rotating handle 103 to coordinately control the pressure balance after the refrigerator 100 is closed and when the door is opened, so as to achieve convenient and fast door opening and no cold leakage or frost around the pressure relief valve. Among them, the spring pressure relief valve 1 is used to control the internal and external pressure difference after the refrigerator 100 is closed, which can avoid deformation of the door body 101 and the door seal caused by excessive pressure difference. The rotating shaft pressure relief valve 2 drives the rotating shaft 22 to rotate by rotating the rotating handle 103 when opening the door, so that the rotating shaft 22 and the sleeve 212 form a continuous and stable second pressure relief channel 23 due to the change in relative position, so as to achieve the effect of fully and quickly balancing the pressure difference; when closing the door, the second pressure relief channel 23 is closed by resetting the rotating handle 103, and no additional operation steps are added to the user.

[0042] Further, in this embodiment, the sleeve assembly 21 of the rotating shaft pressure relief valve 2 specifically includes a first air duct 211, a sleeve 212, and a second air duct 213. The first air duct 211 is connected to the air vent A214 opened on the inner side of the door body 101, and the other end thereof is connected to the sleeve 212; the end of the sleeve 212 away from the first air duct 211 is connected to a C-shaped plate 215, the C-shaped plate 215 is fixed to the inner end of the door shell 102 of the refrigerator 100, and the sleeve 212 is installed and fixed to the corresponding position of the door body 101 of the refrigerator 100 through the C-shaped plate 215, the sleeve 212 contains the rotating shaft 22, and the sleeve 212 is connected to the outside of the second air duct 213, and the end of the second air duct 213 is connected to the outer side of the door body 101; the internal pipes of the first air duct 211, the sleeve 212, and the second air duct 213 form a "Z"-shaped channel A.

[0043] The rotating shaft 22 is solid as a whole, but an air guide groove 221 is opened on one end of the rotating shaft 22 close to the first air guide pipe 211, and an air guide port 222 is opened on the outer wall of the rotating shaft 22 corresponding to the air guide groove 221; the air guide groove 221 and the air guide port 222 are connected to form an "L"-shaped channel B.

[0044] When the rotating shaft 22 rotates in the sleeve 212 along with the rotating handle 103, the air guide port 222 on the rotating shaft 22 rotates accordingly; when the air guide port 222 rotates to a position connected with the second air guide pipe 213, the channel B communicates with the channel A to form a continuous second pressure relief channel 23, so as to achieve the effect of fully and quickly balancing the pressure difference.

[0045] Furthermore, in the present embodiment, the structure of the spring pressure relief valve 1 is consistent with the conventional spring pressure relief valve 1 in the field, and will not be elaborated here. It is only necessary to adjust the elastic force of the spring 11 of the pressure relief valve to be greater than or equal to 4.13N; at the same time, one end of the spring pressure relief valve 1 is connected to the air vent B14 on the inside of the door body 101, and the other end is connected to the outside of the door body 101.

[0046] Furthermore, in this embodiment, the effective diameter of the first pressure relief channel 13 of the spring pressure relief valve 1 is set to 16.2 mm; and the effective diameter of the second pressure relief channel 23 of the shaft pressure relief valve 2 is set to 10 mm.

[0047] Furthermore, in this embodiment, a heating structure is also provided on the spring pressure relief valve 1 and the rotating shaft pressure relief valve 2, respectively, for heating the corresponding pressure relief valve. The heating structure is specifically a heater or a heating wire 3; when the heating structure is a heater, the heater is provided in the pipelines of the spring pressure relief valve 1 and the rotating shaft pressure relief valve 2, and the two can share a heater; when the heating structure is a heating wire 3, the heating wire 3 is wound around the outside of the pipelines of the spring pressure relief valve 1 and the rotating shaft pressure relief valve 2, and the heating efficiency is better than that of the heater.

[0048] In addition, the door opening tension and interval time of the refrigerator 100 under the application of the pressure relief structure of this embodiment are calculated as follows:

[0049] Ideal gas pressure formula: pv / T=nR;

[0050] The formula of pressure F and force-bearing surface S is: p = F / S;

[0051] The conversion formula between thermodynamic temperature T and Celsius temperature t: T = t + 273.15 ° C;

[0052] Since the strain of the spring 11 in this embodiment is below the stress limit, Hooke's law is directly used: F = -k·x or ΔF = -k·Δx.

[0053] Lever principle: power × power arm = resistance × resistance arm, expressed algebraically as F1·l1=F2·l2.

[0054] Calculation conditions for pressure difference before opening the door: Refrigerator 100 is a container whose internal temperature changes with refrigeration, but the total amount of gas and volume remain unchanged, so nR is a constant. Therefore, the relationship between pressure p1 and temperature T1 before refrigeration and pressure p2 and temperature T2 after refrigeration can be obtained: p1 / T1=p2 / T2.

[0055] Taking the -80°C ultra-low temperature refrigerator 100 as an example, the internal and external pressures are both atmospheric pressure before refrigeration, p1=101325Pa, T1=15°C+273.15°C=288.15k, T2=-80°C+273.15°C=193.15k, and p2=67919Pa.

[0056] If the effective contact area Sa of the refrigerator door box is 1m 2 If the pressure is not released at this time, the door opening tension Fa=p1*Sa-p2*Sa=40087N, so the pressure relief valve is an indispensable component of the ultra-low temperature refrigerator 100.

[0057] At present, the fluctuation range of ultra-low temperature refrigerators 100 in the industry is required to be ≤10℃, so the minimum elastic force Fb of the spring pressure relief valve 1 is calculated to be -71℃ to -81℃ = 4.13N. If it is not greater than this value, the spring pressure relief valve 1 will repeatedly operate with the temperature changes caused by the start and stop of the compressor, causing cold leakage and severe frost. However, the door opening pulling force Fa corresponding to the minimum elastic force Fb is 6014.8N. Even after the rotating handle 103 saves effort through the lever principle, it will still reach more than 1000N. Usually, the door can only be opened by further reducing Fb and reducing the temperature fluctuation range in the box. This is why the door of the ultra-low temperature refrigerator 100 often cannot be opened or is frosted a lot.

[0058] If the design is as in the present embodiment to ensure the minimum elastic force of the spring pressure relief valve 1, and the shaft pressure relief valve 2 is used to completely relieve the pressure when the door is opened, the shaft pressure relief valve 2 will work within 8 seconds (the diameter of this pressure relief channel is 10 mm), and the pressure difference between the inside and the outside will be basically the same. At this time, opening the door will be effortless, and the problem of frost in the box caused by the spring pressure relief valve 1 can be avoided.

[0059] In summary: in this embodiment, when the effective ventilation diameter of the spring pressure relief valve 1 is 16.2mm and the effective ventilation diameter of the shaft pressure relief valve is 10mm, the door opening pulling force Fa corresponding to the minimum spring elastic force Fb is 6014.8N. After the door is opened, the average temperature in the box returns to -45℃ and then the door is closed. The interval time for opening the door again is ≤31s.

[0060] In addition, since the spring pressure relief valve 1 and the shaft pressure relief valve 2 of the present embodiment can be fully sealed, there is no need to increase the heating power compared to the conventional spring pressure relief valve 1. At the same time, since the heating structure does not need to be heated continuously, it has been calculated that the device of the present embodiment only needs to heat for 3 minutes every 5 minutes to maintain the activity and permeability of the pressure relief channel.

[0061] Example 2

[0062] See also Figure 1-12 : A refrigerator of this embodiment includes the refrigerator pressure relief structure of the above-mentioned embodiment 1. The specific structure of the refrigerator pressure relief structure on the refrigerator 100 is the same as that of the embodiment 1, which will not be repeated here. At the same time, the refrigerator 100 has the same advantages as the above-mentioned refrigerator pressure relief structure over the prior art, which will not be repeated here.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigerator pressure relief structure, characterized in that: It comprises a spring pressure relief valve and a rotating shaft pressure relief valve arranged in the door shell of the refrigerator; wherein the spring pressure relief valve drives the elastic valve ball to block or connect the first pressure relief channel through the spring force, so as to achieve the pressure balance inside and outside the refrigerator after the door is closed; the rotating shaft pressure relief valve comprises a sleeve assembly and a rotating shaft located in the sleeve assembly; one end of the rotating shaft is connected to the door body rotating handle, and the rotating shaft is rotated to different positions in the sleeve assembly by rotating the rotating handle to close or connect the second pressure relief channel, so as to achieve the pressure balance inside and outside the refrigerator when the door is opened; A channel A is formed inside the sleeve assembly, and a channel B is formed inside the rotating shaft; when the rotating shaft rotates inside the sleeve assembly to a position where the channel B is connected to the channel A, the second pressure relief channel is connected; The sleeve assembly includes a first air duct, a sleeve and a second air duct; the first air duct is connected to the inner side of the door body, and the other end of the first air duct is connected to the sleeve; the sleeve is fixed to the refrigerator door body, a rotating shaft is accommodated in the sleeve, and the second air duct is connected to the outside of the sleeve, and the end of the second air duct is connected to the outer side of the door body; a "Z"-shaped channel A is formed between the internal pipes of the first air duct, the sleeve and the second air duct.

2. The refrigerator pressure relief structure according to claim 1, characterized in that: One end of the sleeve away from the first air duct is connected to a C-shaped plate; the C-shaped plate is fixed to the inner end of the refrigerator door shell, and the sleeve is installed and fixed to the corresponding position of the refrigerator door body through the C-shaped plate.

3. The refrigerator pressure relief structure according to claim 1, characterized in that: An air guide groove is provided on one end of the rotating shaft close to the first air guide pipe, and an air guide port is provided on the outer wall of the rotating shaft corresponding to the air guide groove; the air guide groove is communicated with the air guide port to form an "L"-shaped channel B.

4. The refrigerator pressure relief structure according to claim 3, characterized in that: When the rotating shaft rotates in the sleeve, the air guide port on the rotating shaft rotates accordingly; when the air guide port rotates to a position connected to the second air guide pipe, channel B communicates with channel A to form a connected second pressure relief channel.

5. The refrigerator pressure relief structure according to claim 1, characterized in that: The spring pressure relief valve and the shaft pressure relief valve are also respectively provided with heating structures for heating the corresponding pressure relief valves.

6. The refrigerator pressure relief structure according to claim 5, characterized in that: The heating structure is a heater or a heating wire; when the heating structure is a heater, the heater is arranged in the pipeline of the spring pressure relief valve and the rotating shaft pressure relief valve; when the heating structure is a heating wire, the heating wire is wound around the outside of the pipeline of the spring pressure relief valve and the rotating shaft pressure relief valve.

7. The refrigerator pressure relief structure according to any one of claims 1 to 6, characterized in that: The spring force of the spring pressure relief valve is greater than or equal to 4.13N, and the diameter of the first pressure relief channel is 16.2mm; the diameter of the second pressure relief channel of the shaft pressure relief valve is 10mm.

8. A refrigerator, characterized in that: It comprises the refrigerator pressure relief structure as described in any one of claims 1 to 7.

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