CN113267155A - Refrigerator and door opening angle detection method - Google Patents
Refrigerator and door opening angle detection method Download PDFInfo
- Publication number
- CN113267155A CN113267155A CN202010095002.9A CN202010095002A CN113267155A CN 113267155 A CN113267155 A CN 113267155A CN 202010095002 A CN202010095002 A CN 202010095002A CN 113267155 A CN113267155 A CN 113267155A
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- China
- Prior art keywords
- door
- distance
- opening angle
- door opening
- refrigerator
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/02—Doors; Covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/02—Sensors detecting door opening
Abstract
The invention discloses a refrigerator and a door opening angle detection method, wherein the refrigerator comprises a refrigerator body, a door body and an angle detection device, wherein the door body is pivoted and connected to the refrigerator body by taking a rotating axis as a shaft; and the calculating unit is in communication connection with the distance sensor and calculates the door opening angle according to the first distance m, the second distance n between the box body and the door body measured by the distance sensor and the first angle beta.
Description
Technical Field
The invention relates to an angle detection device and a door opening angle detection method, in particular to a simple and durable refrigerator and a door opening angle detection method.
Background
At present, two methods are generally used for detecting the opening and closing of the refrigerator door body: mechanical door opening and closing mode, Hall sensor door opening and closing mode. The mechanical door switch has a movable mechanical structure, but the number of times of opening and closing the mechanical door switch is increased, which affects the service life and easily causes a failure of a mechanical structure component. The Hall sensor type door switch adopts a multi-component separation scheme that a door body is provided with a Hall sensor and a box body is provided with a magnet, the scheme is complex, and the requirement on structural matching is high.
Disclosure of Invention
The invention aims to solve the problems that the detection scheme of the opening and closing of the refrigerator door is complex and not durable.
In order to realize one of the purposes of the invention, the invention adopts the following technical scheme:
a refrigerator comprises a refrigerator body, a door body and an angle detection device, wherein the door body is pivotally connected to the refrigerator body by taking a rotating axis as a shaft, the refrigerator further comprises the angle detection device for measuring the door opening angle of the door body, the angle detection device comprises a distance sensor, the distance sensor is fixedly arranged on one of the refrigerator body and the door body, the distance between the distance sensor and the rotating axis is a first distance m, and the distance sensor emits a measurement signal by taking one of two planes opposite to the refrigerator body and the door body as a first angle beta; and the calculating unit is in communication connection with the distance sensor and calculates the door opening angle according to the first distance m, a second distance n between the box body and the door body measured by the distance sensor and a first angle beta.
Further, β is 90 °.
Further, the distance sensor is arranged on the inner surface of the door body facing the box body.
Further, the first distance is half of the width of the door body.
Furthermore, the refrigerator also comprises an output unit used for outputting the door opening angle of the door body, and the output unit is a display screen or a voice player.
A door opening angle detection method for the refrigerator comprises the following steps: s1: acquiring a second distance n between the door body and the box body through a distance sensor; s2: and calculating the door opening angle of the refrigerator according to the second distance n, the first distance m between the distance sensor and the rotation axis and the first angle beta.
Further, in step S2, the calculating means calculates the door opening angle α of the door body based on the formula m × sin α ═ n × sin (α + β).
In step S2, β is 90 °, and the calculating means calculates the door opening angle α of the door body based on the formula α arctan (n/m).
Further, the frequency of acquiring the second distance n by the distance sensor when the door body is in the closed state is lower than the frequency of acquiring the second distance n when the door body is in the open state.
Further, still include: when the door opening angle is 0 degrees, outputting the closing state of the door body; and when the door opening angle is larger than 0 degree, outputting the numerical value of the door opening angle alpha.
Compared with the prior art, the door opening angle of the door body can be obtained through calculation only by measuring the second distance n through the distance sensor, so that the refrigerator can accurately obtain the actual door opening and closing angles of the refrigerator, and the opening and closing state and the stop position of the door body can be obtained in real time. The distance sensor is mounted on the refrigerator, the structure which needs to correspond is simple, supporting devices such as magnets are not needed, a movable mechanical structure is not needed, damage is not prone to occurring in the using process, and the distance sensor is durable.
Drawings
Fig. 1 is a schematic structural view of a refrigerator according to an embodiment of the present invention;
FIG. 2 is a schematic view of the triangle of the door opening angle of FIG. 1;
fig. 3 is a flow chart of the door opening angle detection method of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Fig. 1 is a schematic structural view of a refrigerator according to an embodiment of the present invention, and fig. 2 is a schematic triangular view of a door opening angle in fig. 1.
Referring to fig. 1 and 2, a refrigerator 1 includes a cabinet 2, a door 3, and an angle detecting device 4.
The door 3 is pivotally connected to the cabinet 2 about a rotational axis L to open or close the refrigerator 1.
The angle detection device 4 is used for measuring the door opening angle α of the door 3, and includes a distance sensor 41 and a calculation unit 42. The calculating unit 42 is communicatively connected to the distance sensor 41, that is, the distance sensor 41 can transmit the measurement data to the calculating unit 42, and the calculating unit 42 receives the measurement data and calculates the door opening angle.
The distance sensor 41 is fixedly disposed on one of the box body 2 and the door body 3, and is capable of detecting a distance n between the door body 3 and the box body 2 during the door opening and closing process, and for convenience of description, the distance is defined as a second distance n.
A distance m between the distance sensor 41 and the rotation axis L is defined as a first distance m, the distance sensor 41 emits a measurement signal at a first angle β with respect to a plane of one of the door 3 and the cabinet 2, and a distance between the cabinet 2 and the door 3 is measured as a second distance n.
In a specific embodiment, the distance sensor 41 is disposed on an inner surface of the door 3 facing the cabinet 2, and the first distance m is set to be half of the width of the door 3, so that when the door 3 is opened to a maximum angle, a signal sent by the distance sensor 41 can reach the cabinet 2 and be reflected back to the distance sensor 41.
Preferably, the measuring signal emitted by the distance sensor 41 is β with the plane of the box or door body to which it is fixed, so that the first angle β does not change during the opening and closing of the door without adjusting the distance sensor 41.
Preferably, the distance sensor 41 is fixed to the door body, and the distance sensor 41 emits a signal perpendicular to the plane of the door body 3, that is, β is 90 °, in this case, α is arctan (n/m), and the calculation formula is simple.
The calculating unit 42 calculates the door opening angle according to the first distance m, the second distance n between the box body 2 and the door body 3 measured by the distance sensor 41, and the first angle β.
Normally, the first distance m and the first angle β are pre-stored in the calculating unit 42, and the distance sensor 41 measures and transmits the second distance n to the calculating unit 42.
As shown in fig. 2, the first distance m, the second distance n, the first angle β and the door opening angle α satisfy the following equations through the transformation calculation of the trigonometric function: m × sin α ═ n × sin (α + β). Since the first distance m, the first angle β and the second distance n (measured) are known quantities, the calculating unit 42 can calculate the door opening angle α according to the above equation.
In this way, the angle detection device 4 can calculate the door opening angle α of the door 3 after measurement only by providing the distance sensor 41 and the calculation unit 42, so that the refrigerator 1 can accurately obtain the actual door opening and closing angles thereof, and obtain the opening and closing state and the stop position of the door 3 in real time. The distance sensor 41 is mounted on the refrigerator 1, and has a simple structure, does not need a magnet or other auxiliary devices, has no movable mechanical structure, is not easy to damage in the using process, and is durable.
Fig. 3 is a flowchart of a door opening angle detecting method of the present invention, please refer to fig. 1 to 3 together, and the door opening angle detecting method for the refrigerator 1 includes the following steps: s1: acquiring a second distance n between the door body 3 and the box body 2 through a distance sensor 41; s2: and calculating the door opening angle of the refrigerator 1 according to the second distance n, the first distance m between the distance sensor and the rotation axis L and the first angle beta.
In step S1, the distance sensor 41 detects the distance between the door 3 and the cabinet 2 in real time, and transmits the data to the computing unit 42.
Preferably, the frequency of acquiring the second distance n by the distance sensor 41 when the door 3 is in the closed state is lower than the frequency of acquiring the second distance n when the door 3 is in the open state, so as to reduce energy consumption. Specifically, when the door 3 is in a closed state, the distance sensor 41 does not operate or operates at a lower frequency; when the door 3 is opened, the distance between the door 3 and the cabinet 2 is measured at a predetermined frequency to calculate the door opening angle.
In step S2, the door opening angle α of the door body is calculated by the calculating unit based on the formula m × sin α ═ n × sin (α + β), and the door opening angle α can be accurately calculated only by measuring the second distance n;
alternatively, in step S2, when β is 90 °, the calculating means calculates the door opening angle α of the door body based on the formula α arctan (n/m).
Further, based on any one of the above door opening angle detection methods, the method further comprises outputting a door closing state when the door opening angle is 0 °; and when the door opening angle is larger than 0 degree, outputting the numerical value of the door opening angle alpha. Specifically, the output can be made to the user through a display screen or a voice module, and the output can be made to components in the refrigerator 1 in an internal communication mode, which need to control working parameters according to the door opening angle α.
In summary, the door opening angle of the door 3 can be obtained through calculation only by measuring the second distance n by the distance sensor 41, so that the refrigerator 1 can accurately obtain the actual door opening and closing angles thereof, and obtain the opening and closing state and the stop position of the door 3 in real time. The distance sensor 41 is mounted on the refrigerator 2, and has a simple structure, does not need a magnet or other auxiliary devices, has no movable mechanical structure, is not easy to damage in the using process, and is durable.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a refrigerator, includes box and door body, the door body use the rotation axis as the pivot connect in the box, its characterized in that, refrigerator still includes and is used for measuring the angle detection device of the angle of opening the door of the door body, angle detection device includes:
the distance sensor is fixedly arranged on one of the box body and the door body, the distance between the distance sensor and the rotating axis is a first distance m, and the distance sensor emits a measuring signal at a first angle beta on one of two planes opposite to the box body and the door body;
and the calculating unit is in communication connection with the distance sensor and calculates the door opening angle according to the first distance m, the distance between the box body and the door body measured by the distance sensor, namely a second distance n and a first angle beta.
2. The refrigerator of claim 1, wherein β is 90 °.
3. The refrigerator according to claim 1, wherein the distance sensor is disposed on an inner surface of the door body facing the cabinet.
4. The refrigerator according to claim 3, wherein the first distance m is a half of the width of the door body.
5. The refrigerator according to any one of claims 1 to 4, further comprising an output unit for outputting the door opening angle of the door, wherein the output unit is a display screen or a voice player.
6. A door opening angle detecting method for a refrigerator of claim 1, comprising:
s1: acquiring a second distance n between the door body and the box body through a distance sensor;
s2: and calculating the door opening angle of the refrigerator according to the second distance n, the first distance m between the distance sensor and the rotation axis and the first angle beta.
7. The door opening angle detecting method according to claim 6, wherein in step S2, the calculating means calculates the door opening angle α of the door body based on the formula m × sin α ═ n × sin (α + β).
8. The door opening angle detecting method according to claim 6, wherein in step S2, β is 90 °, and the door opening angle α of the door body is calculated by the calculating means based on the formula α is arctan (n/m).
9. The door opening angle detection method according to claim 6, wherein a frequency of acquiring the second distance n by the distance sensor when the door body is in the closed state is lower than an acquisition frequency of acquiring the door body in the open state.
10. The door opening angle detection method according to any one of claims 6 to 9, characterized by further comprising: when the door opening angle is 0 degrees, outputting the closing state of the door body; and when the door opening angle is larger than 0 degree, outputting the numerical value of the door opening angle alpha.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095002.9A CN113267155A (en) | 2020-02-17 | 2020-02-17 | Refrigerator and door opening angle detection method |
| PCT/CN2020/134458 WO2021164381A1 (en) | 2020-02-17 | 2020-12-08 | Refrigerator and door opening angle detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095002.9A CN113267155A (en) | 2020-02-17 | 2020-02-17 | Refrigerator and door opening angle detection method |
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| Publication Number | Publication Date |
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| CN113267155A true CN113267155A (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010095002.9A Pending CN113267155A (en) | 2020-02-17 | 2020-02-17 | Refrigerator and door opening angle detection method |
Country Status (2)
| Country | Link |
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| CN (1) | CN113267155A (en) |
| WO (1) | WO2021164381A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114500832A (en) * | 2021-12-31 | 2022-05-13 | 合肥美的智能科技有限公司 | Storage cabinet, image acquisition method, readable storage medium and computer program product |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5500725A (en) * | 1993-09-28 | 1996-03-19 | Minolta Co., Ltd. | Original document reading device capable of automatically detecting the size of an original document |
| CN102967244A (en) * | 2012-11-09 | 2013-03-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Angle detection tool and detection method thereof |
| KR20130055965A (en) * | 2011-11-21 | 2013-05-29 | 현대모비스 주식회사 | Apparatus for preventing vehicle door scratch and method thereof |
| CN204439036U (en) * | 2015-01-13 | 2015-07-01 | 北京汽车研究总院有限公司 | The measurement mechanism at vehicle side inclination angle |
| CN204501332U (en) * | 2015-03-20 | 2015-07-29 | 郑万芳 | A kind of improved hospital bed measuring elevation angle |
| US20150278529A1 (en) * | 2014-03-28 | 2015-10-01 | Samsung Electronics Co., Ltd. | Displaying method of electronic device and electronic device thereof |
| KR101667487B1 (en) * | 2015-06-08 | 2016-10-19 | 주식회사 현대케피코 | A device for controoling openning angle of the door in a car |
| WO2017127035A1 (en) * | 2016-01-20 | 2017-07-27 | C4 İnterakti̇f Bi̇li̇şi̇m Ve Reklam Teknoloji̇leri̇ Diş Ti̇c. Ltd. Şti̇. | Cameral remote inventory and advertisement system for refrigerated showcase units |
| US20170321960A1 (en) * | 2016-05-05 | 2017-11-09 | Sears Brands, L.L.C. | Door alarm system and refrigeration device |
| CN108362071A (en) * | 2018-04-17 | 2018-08-03 | 南京中竞科电子科技有限公司 | A kind of door opening/closing apparatus of refrigerator, refrigerator, door opening method and shutdown method |
| CN108979413A (en) * | 2018-07-19 | 2018-12-11 | 广东东箭汽车科技股份有限公司 | A kind of car door autocontrol method and device |
| CN208973753U (en) * | 2018-06-20 | 2019-06-14 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish-washing machine and its door body control device |
| CN209131570U (en) * | 2019-01-16 | 2019-07-19 | 丁喜华 | A kind of angle measurement unit |
| CN110338643A (en) * | 2019-07-26 | 2019-10-18 | 珠海格力电器股份有限公司 | A kind of box cooker and control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980372B (en) * | 2012-12-28 | 2015-06-17 | 合肥美的电冰箱有限公司 | Refrigerator |
| DE102013221494A1 (en) * | 2013-10-23 | 2015-04-23 | Robert Bosch Gmbh | Method and device for determining a rotation angle of an object about a rotation axis |
| CN107461979A (en) * | 2016-06-03 | 2017-12-12 | 博西华电器（江苏）有限公司 | Refrigerator |
| DE102018209454A1 (en) * | 2018-06-13 | 2019-12-19 | Geze Gmbh | monitoring device |
-
2020
- 2020-02-17 CN CN202010095002.9A patent/CN113267155A/en active Pending
- 2020-12-08 WO PCT/CN2020/134458 patent/WO2021164381A1/en active Application Filing
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5500725A (en) * | 1993-09-28 | 1996-03-19 | Minolta Co., Ltd. | Original document reading device capable of automatically detecting the size of an original document |
| KR20130055965A (en) * | 2011-11-21 | 2013-05-29 | 현대모비스 주식회사 | Apparatus for preventing vehicle door scratch and method thereof |
| CN102967244A (en) * | 2012-11-09 | 2013-03-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Angle detection tool and detection method thereof |
| US20150278529A1 (en) * | 2014-03-28 | 2015-10-01 | Samsung Electronics Co., Ltd. | Displaying method of electronic device and electronic device thereof |
| CN204439036U (en) * | 2015-01-13 | 2015-07-01 | 北京汽车研究总院有限公司 | The measurement mechanism at vehicle side inclination angle |
| CN204501332U (en) * | 2015-03-20 | 2015-07-29 | 郑万芳 | A kind of improved hospital bed measuring elevation angle |
| KR101667487B1 (en) * | 2015-06-08 | 2016-10-19 | 주식회사 현대케피코 | A device for controoling openning angle of the door in a car |
| WO2017127035A1 (en) * | 2016-01-20 | 2017-07-27 | C4 İnterakti̇f Bi̇li̇şi̇m Ve Reklam Teknoloji̇leri̇ Diş Ti̇c. Ltd. Şti̇. | Cameral remote inventory and advertisement system for refrigerated showcase units |
| US20170321960A1 (en) * | 2016-05-05 | 2017-11-09 | Sears Brands, L.L.C. | Door alarm system and refrigeration device |
| CN108362071A (en) * | 2018-04-17 | 2018-08-03 | 南京中竞科电子科技有限公司 | A kind of door opening/closing apparatus of refrigerator, refrigerator, door opening method and shutdown method |
| CN208973753U (en) * | 2018-06-20 | 2019-06-14 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish-washing machine and its door body control device |
| CN108979413A (en) * | 2018-07-19 | 2018-12-11 | 广东东箭汽车科技股份有限公司 | A kind of car door autocontrol method and device |
| CN209131570U (en) * | 2019-01-16 | 2019-07-19 | 丁喜华 | A kind of angle measurement unit |
| CN110338643A (en) * | 2019-07-26 | 2019-10-18 | 珠海格力电器股份有限公司 | A kind of box cooker and control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114500832A (en) * | 2021-12-31 | 2022-05-13 | 合肥美的智能科技有限公司 | Storage cabinet, image acquisition method, readable storage medium and computer program product |
| CN114500832B (en) * | 2021-12-31 | 2024-04-09 | 合肥美的智能科技有限公司 | Locker, image acquisition method, readable storage medium and computer program product |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021164381A1 (en) | 2021-08-26 |
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