WO2017202087A1

WO2017202087A1 - Airtightness check method for refrigeration and freezing device, and refrigeration and freezing device

Info

Publication number: WO2017202087A1
Application number: PCT/CN2017/074605
Authority: WO
Inventors: 娄喜才; 王铭; 牟森; 何胜涛
Original assignee: 青岛海尔股份有限公司
Priority date: 2016-05-26
Filing date: 2017-02-23
Publication date: 2017-11-30
Also published as: CN106017804A; CN106017804B

Abstract

An airtightness check method for a refrigeration and freezing device. A sealed space is provided inside a storage compartment of the refrigeration and freezing device; the sealed space is filled with nitrogen to fresh food therein. The check method comprises: measuring nitrogen concentration inside a sealed space (S302); determining a maintaining duration during which the nitrogen concentration inside the sealed space is maintained within a preset range of concentration to be measured (S304); calculating a duration difference between the maintaining duration and a preset statistical duration (S306); if the duration difference is greater than a preset threshold, determining that the airtightness of the sealed space does not satisfy a preset requirement (S310); and if the duration difference is smaller than or equal to the preset threshold, determining that the airtightness of the sealed space satisfies the preset requirement (S312). The check method can determine, on the basis of a duration required for a change in the nitrogen concentration in a sealed space, whether the airtightness of the sealed box satisfies a preset requirement, and can timely find out cases where sealed boxes are not tightly sealed. Also provided is a refrigeration and freezing device.

Description

Airtightness inspection method for refrigerating and freezing equipment and refrigerating and freezing equipment

Technical field

The present invention relates to the field of article storage, and in particular to a hermetic inspection method for a refrigerating and freezing device and a refrigerating and freezing device.

Background technique

In order to improve their own fresh-keeping effect, some refrigerating and freezing equipments are equipped with a nitrogen-making device inside, and a nitrogen gas is sealed into a sealed box or a sealed drawer of the room to suppress the aerobic respiration and microbial growth of the food itself.

For this type of refrigerating and freezing equipment, after the user opens the sealed box to take food, there is a case where the user forgets to close the sealed box or closes the sealed box. For example, a sealed box with a drawer installed, because the user forgets to close the drawer or does not push the drawer to the end, resulting in a tight seal, and for example, a sealed box with a pivotable door body, because the user does not close the door body, resulting in a seal Strictly wait. These conditions can lead to the rapid loss of nitrogen in the sealed box, thus affecting the preservation effect of the food.

Summary of the invention

In view of the above problems, the present invention has been made in order to provide a hermetic inspection method for a refrigerating and freezing apparatus and a refrigerating and freezing apparatus that overcome the above problems or at least partially solve the above problems.

A further object of the invention is to check the airtightness of the sealed space of the refrigerating and freezing apparatus.

Another further object of the invention is to improve the accuracy of the air tightness inspection.

According to an aspect of the invention, the present invention provides a hermetic inspection method for a refrigerating and freezing apparatus in which a storage space is provided inside a storage compartment of a refrigerating and freezing apparatus, and a sealed space is filled with nitrogen gas to be internal thereto The food is kept fresh, and the inspection method comprises: detecting the nitrogen concentration inside the sealed space; determining the maintenance time of the nitrogen concentration inside the sealed space within the preset concentration range according to the nitrogen concentration; calculating the maintenance time and the preset statistical time The time difference, the statistical time is calculated according to the historical record of the maintenance time; whether the time difference is greater than a preset threshold; if so, it is determined that the airtightness of the sealed space does not reach the preset requirement; and if not, the sealed space is determined The air tightness meets the preset requirements.

Optionally, the step of determining that the nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested comprises: selecting from a preset plurality of concentration ranges according to the detected value of the nitrogen concentration As a concentration range to be tested, the upper limit of the concentration range to be tested is smaller than the detection value of the nitrogen concentration, and each preset concentration range corresponds to a statistical time recorded; the nitrogen concentration is lowered from the upper limit of the concentration range to be tested to The process of the lower limit is timed to obtain the hold time.

Optionally, in the time that the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed space is opened, the inspection is cancelled, and after waiting for the sealed space to be closed and refilled with nitrogen, the detection of the nitrogen concentration inside the sealed space is performed again. step.

Optionally, after the step of determining that the airtightness of the sealed space does not reach the preset requirement, the method further includes: prompting that the airtightness of the sealed space does not reach a preset requirement.

Optionally, after the step of determining that the airtightness of the sealed space reaches a preset requirement, the method further comprises: calculating an average value of the maintenance time and the statistical time, and replacing the average value with the statistical time for use in the next check.

According to another aspect of the present invention, a refrigerating and freezing apparatus is further provided, comprising: a sealed box disposed inside a storage compartment of the refrigerating and freezing apparatus, the sealing box defining a sealed space, the sealed space being filled with nitrogen gas, to The internal food is preserved; the nitrogen concentration sensor is disposed in the sealed space and configured to detect the concentration of nitrogen in the sealed space; the timing device is configured to determine that the nitrogen concentration inside the sealed space is maintained at a preset concentration range according to the nitrogen concentration. And the airtightness checking device configured to calculate a time difference between the maintenance time and the preset statistical time, and the statistical time is obtained according to the historical record of the maintenance time, and it is determined whether the time difference is greater than a preset threshold. If yes, it is determined that the airtightness of the sealed space does not reach the preset requirement, and if not, it is determined that the airtightness of the sealed space reaches a preset requirement.

Optionally, the airtightness checking device is further configured to select one of the preset plurality of concentration ranges as the to-be-measured concentration range according to the detected value of the nitrogen concentration, and the upper limit of the to-be-measured concentration range is smaller than the detected value of the nitrogen concentration. Each preset concentration range corresponds to a statistical time recorded; and the timing device is further configured to time the process of lowering the nitrogen concentration from the upper limit value of the concentration range to be measured to the lower limit value to obtain the maintenance time.

Optionally, the refrigerating and freezing apparatus further includes: a sealed box opening detecting device configured to detect whether the sealed box is opened; and the airtightness checking device is further configured to maintain the nitrogen concentration within a time range to be measured, if When it is detected that the sealed box is opened, the inspection is cancelled; the nitrogen concentration sensor is further configured to re-execute the step of detecting the concentration of nitrogen inside the sealed space after the sealed box is closed and refilled with nitrogen.

Optionally, the above refrigerating and freezing device further comprises: a prompting device configured to determine the sealed space After the airtightness has not reached the preset requirement, the airtightness of the output sealed space does not reach the preset requirement prompt signal.

Optionally, the airtightness inspection device is further configured to calculate an average value of the maintenance time and the statistical time after determining that the airtightness of the sealed space reaches a preset requirement, and replace the average value with the statistical time for the next inspection.

The invention provides a gas tightness inspection method for a refrigerating and freezing device. The inside of the storage compartment of the refrigerating and freezing device is provided with a sealed space, and the sealed space is filled with nitrogen gas to preserve the food inside thereof, and the inspection method includes : detecting the concentration of nitrogen inside the sealed space, determining the maintenance time of the nitrogen concentration inside the sealed space within the preset concentration range to be measured, and calculating the time difference between the maintenance time and the preset statistical time; if the time difference is greater than the pre- If the threshold is set, it is determined that the airtightness of the sealed space does not reach the preset requirement. If the time difference is less than or equal to the preset threshold, it is determined that the airtightness of the sealed space reaches a preset requirement. The inspection method of the invention can determine whether the airtightness of the sealed box reaches a preset requirement according to the time required for the change of the nitrogen concentration in the sealed space, and can timely find that the sealing box is not tightly sealed.

Further, the method of the present invention is provided with a plurality of concentration ranges in advance, and the airtightness inspection device selects one of the appropriate concentration ranges according to the detected value of the nitrogen concentration as the concentration range to be tested for the subsequent inspection process. The nitrogen concentration in the sealed space will decrease with time, and the upper limit of the selected concentration range to be measured needs to be smaller than the current nitrogen concentration to ensure that the nitrogen concentration can start to decrease from the upper limit of the concentration range to be tested, and the detected maintenance time is guaranteed. And the accuracy of the inspection results.

Further, in the method of the present invention, if it is detected that the sealed case is opened within the time range within the concentration range to be tested, the inspection is canceled. In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed box is opened, the nitrogen concentration will rapidly drop and reach the lower limit of the concentration range to be tested in a short time. In this case, the actual recording of the timekeeping device is much shorter than the theoretical maintenance time, which will result in an error in the final inspection, so the current timing and corresponding inspections are discarded to ensure the accuracy of the inspection results.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention are described in detail below by way of example, and not limitation. The same reference numbers in the drawings identify the same or similar parts. Field The skilled artisan will understand that the drawings are not necessarily to scale. In the figure:

1 is a schematic block diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention;

2 is a schematic block diagram of a refrigerating and freezing apparatus according to another embodiment of the present invention;

3 is a schematic view showing a gas tightness inspection method of a refrigerating and freezing apparatus according to an embodiment of the present invention;

4 is a flow chart of a method of airtightness inspection of a refrigerating and freezing apparatus according to another embodiment of the present invention.

detailed description

This embodiment first provides a refrigerating and freezing apparatus, and Fig. 1 is a schematic block diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention. The refrigerating and freezing device may be a refrigerator, a freezer, or the like. The refrigerating and freezing apparatus includes a sealed box 100, a nitrogen concentration sensor 200, a timing device 300, and an airtightness inspection device 400.

In the interior of the storage compartment of the refrigerating and freezing apparatus of the present embodiment, a sealed casing 100 is provided, and the sealed casing 100 defines a sealed space in which nitrogen gas is filled and used for storing foods that require long-term preservation. The nitrogen concentration sensor 200 is disposed in the sealed space for detecting the concentration of nitrogen in the sealed space.

After the sealed box 100 is opened and used, the sealing is not easy. For example, the sealed box 100 with the drawer installed, because the user forgets to close the drawer or does not push the drawer to the end, the sealing is not strict, and for example, the installation is The sealing box 100 of the pivoting door is not tightly sealed due to the user not closing the door body, and these conditions easily lead to rapid leakage of nitrogen in the sealed space. The refrigerating and freezing apparatus of the present embodiment judges whether or not the airtightness of the sealed casing 100 reaches a preset requirement in accordance with the time required for the change in the nitrogen concentration in the sealed space. The above preset requirements can be set according to the rate of decrease of the nitrogen concentration of the sealed box.

Specifically, the timing device 300 first determines, according to the detection result of the nitrogen concentration sensor 200, the maintenance time in which the nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested, for example, determining that the nitrogen concentration is maintained at 93%-96%. Maintenance time within the concentration range. When the nitrogen concentration enters the concentration range to be tested, the timing device 300 starts counting. When the nitrogen concentration is out of the concentration range to be tested, the timing device 300 ends the counting to obtain the maintenance time. The longer the maintenance time, the slower the nitrogen leakage, and the better the airtightness of the sealed box 100. The airtightness checking device 400 calculates the time difference between the maintenance time and the preset statistical time, specifically subtracts the maintenance time from the statistical time to obtain the time difference. The time is calculated based on the history of the maintenance time. The refrigerating and freezing device of the embodiment automatically records and stores the maintenance time obtained by each inspection, and analyzes and summarizes the plurality of maintenance times in the history to obtain a statistical time. In some embodiments, the statistical time may be the previous maintenance time. average value. Finally, it is determined whether the time difference is greater than a preset threshold. If yes, it is determined that the airtightness of the sealed space does not reach the preset requirement, and if not, the airtightness of the sealed space is determined to reach a preset requirement. For example, if the preset threshold is 30 min, if the calculated time difference is 20 min, then it is determined that the airtightness of the sealed space reaches a preset requirement, indicating that the sealed box 100 is well sealed, and if the calculated time difference is 40 min, then the determination is made. The airtightness of the sealed space does not reach the preset requirement, indicating that the sealed box 100 is not tightly sealed. The above preset threshold value may be set in advance based on the test of the sealed box 100. The above specific numerical values are merely illustrative and are not intended to limit the present invention.

The airtightness inspection device 400 further selects one of the plurality of concentration ranges from the predetermined concentration range according to the detected value of the nitrogen concentration, and the detected value of the nitrogen concentration is the current nitrogen concentration detected by the nitrogen concentration sensor 200, and the concentration to be measured The upper limit of the range is smaller than the detection value of the nitrogen concentration, and each preset concentration range corresponds to the recorded statistical time. Further, the timer device 300 counts the process in which the nitrogen concentration is lowered from the upper limit value of the concentration range to be measured to the lower limit value to obtain the maintenance time.

The refrigerating and freezing apparatus is previously provided with a plurality of concentration ranges, and the airtightness inspection apparatus 400 selects one of the appropriate concentration ranges based on the detected value of the nitrogen concentration, that is, the current nitrogen concentration, as the concentration range to be tested for the subsequent inspection process. Since the nitrogen concentration of the sealed space will decrease with time, the upper limit of the selected concentration range to be measured needs to be smaller than the current nitrogen concentration to ensure that the nitrogen concentration can be decreased from the upper limit of the concentration range to be tested, and preferably, The concentration range is close to the current nitrogen concentration to save inspection time. For example, the concentration range is 80%-81%, 84%-86%, 93%-96%, and if the current concentration is 98%, then any one of the above three concentration ranges can be selected as the concentration to be tested. Range, preferably 93%-96% is selected as the concentration range to be tested; if the current concentration is 90%, one of 80%-81%, 84%-86% may be selected as the concentration range to be tested, preferably 84 is selected. %-86% is used as the concentration range to be tested. In addition, due to different concentration ranges, the statistical time for maintaining the nitrogen concentration in different concentration ranges is also different. For example, the statistical time of the concentration range of 93%-96% may be 2h, and the statistical time of 84%-86% may be 3h. Each preset concentration range corresponds to a corresponding statistical time recorded, and when the concentration range to be tested is determined, the statistical time is also determined accordingly. The above concentration ranges may be set in advance based on the test of the sealed box 100, and the above specific values are merely illustrative and are not intended to limit the invention.

The nitrogen concentration in the sealed space decreases with time, when the nitrogen concentration is detected to drop to the concentration to be measured When the upper limit value is enclosed, the time measuring device 300 records the time point. The nitrogen concentration of the sealed space continues to decrease. When the nitrogen concentration is detected to decrease to the lower limit value, the timing device 300 records the time point again, and finally calculates the time difference between the two time points to obtain the maintenance time.

The above inspection process is set in a period in which the sealed space is not filled with nitrogen. If it is detected that the sealed space is being filled with nitrogen, it is checked after waiting for the nitrogen gas to be charged.

2 is a schematic block diagram of a refrigerating and freezing apparatus in accordance with another embodiment of the present invention. The refrigerating and freezing apparatus of this embodiment further includes a sealed box opening detecting device 500. The sealed box opening detecting device 500 is for detecting whether the sealed case 100 is opened. The sealed box opening detecting device 500 may include: a Hall sensor, a photoelectric sensor, a displacement sensor, and the like for detecting the opening or closing of the door body or the drawer.

In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed casing 100 is opened, the airtightness inspection device 400 cancels the inspection. In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed box 100 is opened, the nitrogen concentration will rapidly drop and reach the lower limit of the concentration range to be tested in a short time. In this case, the actual recording of the timekeeping device 300 is much less than the theoretical maintenance time, which will result in an error in the final inspection, thus discarding this timing and the corresponding inspection.

In the case where the sealed case 100 is opened, the nitrogen concentration sensor 200 waits for the step of detecting the nitrogen concentration inside the sealed space after the sealed case 100 is closed and refilled with nitrogen.

The refrigerating and freezing apparatus of this embodiment further includes a prompting device 600. The prompting device 600 determines that the airtightness of the sealed space does not reach the preset requirement prompt signal after determining that the airtightness of the sealed space does not reach the preset requirement. In some embodiments, the prompting device 600 can be a buzzer. After determining that the airtightness of the sealed space does not reach the preset requirement, the buzzer issues an alarm; in other embodiments, the prompting device 600 can be configured to The display on the surface of the refrigerating and freezing device displays a fault code after determining that the airtightness of the sealed space does not reach the preset requirement.

In the present embodiment, the airtightness inspection device 400 also calculates the average value of the maintenance time and the statistical time after determining that the airtightness of the sealed space reaches the preset requirement, and replaces the average value with the statistical time for the next inspection. The above average is replaced by the statistical time to improve the accuracy and reliability of the statistical time.

The present invention also provides a gas tightness inspection method for a refrigerating and freezing apparatus. 3 is a schematic view of a gas tightness inspection method of a refrigerating and freezing apparatus according to an embodiment of the present invention.

In step S302, the concentration of nitrogen inside the sealed space is detected.

Step S304, determining that the nitrogen concentration inside the sealed space is maintained at a preset according to the nitrogen concentration. The maintenance time in the concentration range to be tested. The timing device 300 first determines, according to the detection result of the nitrogen gas concentration sensor 200, the maintenance time in which the nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested, for example, determining that the nitrogen concentration is maintained within a concentration range of 93%-96%. Maintenance time. When the nitrogen concentration enters the concentration range to be tested, the timing device 300 starts counting. When the nitrogen concentration is out of the concentration range to be tested, the timing device 300 ends the counting to obtain the maintenance time. The longer the maintenance time, the slower the nitrogen leakage, and the better the airtightness of the sealed box 100.

Step S306, calculating a time difference between the maintenance time and the preset statistical time, and the statistical time is obtained according to the historical record of the maintenance time. The airtightness checking device 400 calculates the time difference between the maintenance time and the preset statistical time, specifically subtracts the maintenance time from the statistical time to obtain the time difference, and the statistical time is obtained based on the history of the maintenance time. The refrigerating and freezing device of the embodiment automatically records and stores the maintenance time of each inspection, and analyzes and summarizes the plurality of maintenance times in the history to obtain a statistical time. In some embodiments, the statistical time may be an average of the previous maintenance times. value.

Step S308, determining whether the time difference value is greater than a preset threshold.

Step S310, if the result of the determination in step S308 is YES, it is determined that the airtightness of the sealed space does not reach the preset requirement. For example, if the preset threshold is 30 min, if the calculated time difference is 40 min, it is determined that the airtightness of the sealed space does not reach the preset requirement, indicating that the sealed box 100 is not tightly sealed.

Step S312, if the result of the determination in step S308 is negative, it is determined that the airtightness of the sealed space reaches a preset requirement. For example, the preset threshold is 30 min. If the calculated time difference is 20 min, it is determined that the airtightness of the sealed space reaches a preset requirement, indicating that the sealed box 100 is well sealed.

4 is a flow chart of a method of airtightness inspection of a refrigerating and freezing apparatus according to another embodiment of the present invention. The control method performs the following steps in sequence:

In step S402, the concentration of nitrogen inside the sealed space is detected.

Step S404, selecting one of the plurality of concentration ranges according to the detected value of the nitrogen concentration as the concentration range to be tested. The detected value of the above nitrogen concentration is the current nitrogen concentration detected by the nitrogen concentration sensor 200. The refrigerating and freezing apparatus is previously provided with a plurality of concentration ranges, and the airtightness inspection apparatus 400 selects one of the appropriate concentration ranges as the to-be-measured concentration range for the subsequent inspection process. Since the nitrogen concentration of the sealed space may decrease with time, the upper limit value of the selected concentration range to be measured needs to be smaller than the detected value of the nitrogen concentration, that is, the current nitrogen concentration, and preferably, the concentration range to be tested is close to the current nitrogen concentration. For example, the concentration range is 80%-81%, 84%-86%, 93%-96%, and if the current concentration is 98%, then any of the above three concentration ranges can be selected. One is selected as the concentration range to be tested, preferably 93%-96% is selected as the concentration range to be tested; if the current concentration is 90%, one of 80%-81% and 84%-86% may be selected as the concentration to be tested. Range, preferably 84%-86% is selected as the concentration range to be tested. In addition, due to different concentration ranges, the statistical time for maintaining the nitrogen concentration in different concentration ranges is also different. For example, the statistical time of the concentration range of 93%-96% may be 2h, and the statistical time of 84%-86% may be 3h. Each preset concentration range corresponds to a statistical time recorded. When the concentration range to be tested is determined, the statistical time is also determined accordingly.

In step S406, the process of lowering the nitrogen concentration from the upper limit value of the concentration range to be tested to the lower limit value is counted to obtain the maintenance time. The nitrogen concentration of the sealed space decreases with time, and when it is detected that the nitrogen concentration drops to the upper limit of the concentration range to be tested, the timing device 300 records the time point. The nitrogen concentration of the sealed space continues to decrease. When the nitrogen concentration is detected to decrease to the lower limit value, the timing device 300 records the time point again, and calculates the time difference between the two time points to obtain the maintenance time.

Step S408, detecting whether the sealed space is opened within a time period in which the nitrogen concentration is maintained within the concentration range to be tested.

In step S410, if the result of the determination in the step S408 is YES, the inspection is canceled, and the sealed space is closed and the nitrogen is refilled. In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed space is opened, the nitrogen concentration will rapidly drop and reach the lower limit of the concentration range to be tested in a short time. In this case, the actual recording of the timekeeping device 300 is much less than the theoretical maintenance time, which will result in an error in the final inspection, thus discarding this timing and the corresponding inspection. In the case where the sealed case 100 is opened, the step of detecting the concentration of nitrogen inside the sealed space is re-executed after waiting for the sealed case 100 to be closed and refilled with nitrogen.

Step S412, calculating a time difference between the maintenance time and the preset statistical time, and the statistical time is obtained according to the historical record of the maintenance time.

Step S414, determining whether the time difference value is greater than a preset threshold.

Step S416, if the result of the determination in step S414 is YES, it is determined that the airtightness of the sealed space does not reach the preset requirement.

Step S418, the prompt signal that the airtightness of the sealed space does not reach the preset requirement is output. The prompting device 600 determines that the airtightness of the sealed space does not reach the preset requirement prompt signal after determining that the airtightness of the sealed space does not reach the preset requirement. In some embodiments, the prompting device 600 can be a buzzer. After determining that the airtightness of the sealed space does not reach the preset requirement, the buzzer issues an alarm; in other embodiments, the prompting device 600 can be configured to a display that refrigerates the surface of the freezer, After determining that the airtightness of the sealed space has not reached the preset requirement, the display displays a fault code.

In step S420, if the result of the determination in step S414 is negative, it is determined that the airtightness of the sealed space reaches a preset requirement.

In step S422, the average value of the maintenance time and the statistical time is calculated, and the average value is replaced with the statistical time for use in the next check. The airtightness inspection device 400 also calculates an average value of the maintenance time and the statistical time after determining that the airtightness of the sealed space reaches the preset requirement, and replaces the average value with the statistical time for use in the next inspection. The above average is replaced by the statistical time to improve the accuracy and reliability of the statistical time.

The embodiment provides a hermetic inspection method for a refrigerating and freezing device. The inside of the storage compartment of the refrigerating and freezing device is provided with a sealed space, and the sealed space is filled with nitrogen gas to preserve the food inside thereof, including : detecting the concentration of nitrogen inside the sealed space, determining the maintenance time of the nitrogen concentration inside the sealed space within the preset concentration range to be measured, and calculating the time difference between the maintenance time and the preset statistical time; if the time difference is greater than the pre- If the threshold is set, it is determined that the airtightness of the sealed space does not reach the preset requirement. If the time difference is less than or equal to the preset threshold, it is determined that the airtightness of the sealed space reaches a preset requirement. The inspection method of the present embodiment can determine whether the airtightness of the sealed casing 100 reaches a preset requirement according to the time required for the change of the nitrogen concentration in the sealed space, and can timely find that the sealed casing 100 is not tightly sealed.

Further, in the method of the present embodiment, a plurality of concentration ranges are set in advance, and the airtightness inspection device 400 selects one of the appropriate concentration ranges as the to-be-measured concentration range for the subsequent inspection process based on the detected value of the nitrogen concentration. The nitrogen concentration in the sealed space will decrease with time, and the upper limit of the selected concentration range to be measured needs to be smaller than the current nitrogen concentration to ensure that the nitrogen concentration can be decreased from the upper limit of the concentration range to be tested, and the accuracy of the inspection result is guaranteed. .

Further, in the method of the present embodiment, if it is detected that the sealed case 100 is opened within the time range within the concentration range to be tested, the inspection is canceled. In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed box 100 is opened, the nitrogen concentration will rapidly drop and reach the lower limit of the concentration range to be tested in a short time. In this case, the actual recording time of the timekeeping device 300 is much less than the theoretical maintenance time, which will result in an error in the final inspection, so the current timing and corresponding inspections are discarded to ensure the accuracy of the inspection results.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations that are consistent with the principles of the invention or modify. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

A hermetic inspection method for a refrigerating and freezing apparatus, the inside of a storage compartment of the refrigerating and freezing apparatus is provided with a sealed space, the sealed space is filled with nitrogen gas to preserve its internal food, and Inspection methods include:

Detecting a concentration of nitrogen inside the sealed space;

Determining, according to the nitrogen concentration, a maintenance time in which a nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested;

Calculating a time difference between the maintenance time and a preset statistical time, where the statistical time is obtained according to a historical record of the maintenance time;

Determining whether the time difference is greater than a preset threshold;

If so, determining that the airtightness of the sealed space does not meet a preset requirement;

If not, it is determined that the airtightness of the sealed space reaches a predetermined requirement.
The method according to claim 1, wherein the step of determining that the nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested comprises:

Selecting, according to the detected value of the nitrogen concentration, a predetermined range of the concentration range, the upper limit value of the concentration range to be tested is smaller than the detection value of the nitrogen concentration, and each The preset concentration ranges respectively correspond to the statistical time recorded;

The process of lowering the nitrogen concentration from the upper limit value of the concentration range to be tested to the lower limit value is counted to obtain the maintenance time.
The method of claim 1 wherein

In the time when the nitrogen concentration is maintained within the concentration range to be tested, if it is detected that the sealed space is opened, the inspection is cancelled, and after the sealed space is closed and refilled with nitrogen, the sealing is re-executed. The step of nitrogen concentration inside the space.
The method according to claim 1, wherein after the step of determining that the airtightness of the sealed space does not reach a preset requirement, the method further comprises:

The airtightness of the sealed space is not up to the preset required prompt signal.
The method according to claim 1, wherein the airtightness of the sealed space is determined to be up to After the steps required by the preset requirements, it also includes:

An average of the maintenance time and the statistical time is calculated, and the average value is replaced with the statistical time for use in the next inspection.
A refrigerating and freezing device comprising:

a sealed box disposed inside the storage compartment of the refrigerating and freezing apparatus, the sealing box defining a sealed space, the sealed space being filled with nitrogen gas to preserve the food inside thereof;

a nitrogen concentration sensor disposed in the sealed space and configured to detect a concentration of nitrogen in the sealed space;

a timing device configured to determine, according to the nitrogen concentration, a maintenance time in which a nitrogen concentration inside the sealed space is maintained within a preset concentration range to be tested;

The airtightness checking device is configured to calculate a time difference between the maintenance time and the preset statistical time, the statistical time is obtained according to the historical record of the maintenance time, and it is determined whether the time difference is greater than a pre- A threshold is set, and if so, it is determined that the airtightness of the sealed space does not reach a preset requirement, and if not, it is determined that the airtightness of the sealed space reaches a preset requirement.
The refrigerating and freezing apparatus according to claim 6, wherein

The airtightness checking device is further configured to select one of the preset plurality of the concentration ranges as the concentration range to be tested according to the detected value of the nitrogen concentration, and the upper limit of the concentration range to be tested is smaller than The detected value of the nitrogen concentration, each of the preset concentration ranges respectively corresponding to the statistical time recorded; and

The timing device is further configured to time the process in which the nitrogen concentration is lowered from an upper limit value of the concentration range to be measured to a lower limit value to obtain the maintenance time.
The refrigerating and freezing apparatus according to claim 6, further comprising:

a sealed box opening detecting device configured to detect whether the sealed box is opened;

The airtightness inspection device is further configured to cancel the inspection if it is detected that the sealed box is opened within a time period in which the nitrogen concentration is maintained within the concentration range to be tested;

The nitrogen concentration sensor is further configured to re-execute the step of detecting the concentration of nitrogen inside the sealed space after the sealed box is closed and refilled with nitrogen.
The refrigerating and freezing apparatus according to claim 6, further comprising:

The prompting device is configured to output a prompt signal that the airtightness of the sealed space does not reach a preset requirement after determining that the airtightness of the sealed space does not reach a preset requirement.
The refrigerating and freezing apparatus according to claim 6, wherein

The airtightness inspection device is further configured to calculate an average value of the maintenance time and the statistical time after determining that the airtightness of the sealed space reaches a preset requirement, and replace the average value with the statistical value Time for use in the next inspection.