CN110608569A - Refrigerator for detecting icing by using capacitive proximity switch - Google Patents
Refrigerator for detecting icing by using capacitive proximity switch Download PDFInfo
- Publication number
- CN110608569A CN110608569A CN201911049686.2A CN201911049686A CN110608569A CN 110608569 A CN110608569 A CN 110608569A CN 201911049686 A CN201911049686 A CN 201911049686A CN 110608569 A CN110608569 A CN 110608569A
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- China
- Prior art keywords
- proximity switch
- refrigerator
- capacitive proximity
- capacitance
- tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/02—Detecting the presence of frost or condensate
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
Abstract
A refrigerator for detecting icing by using a capacitive proximity switch is characterized in that whether an evaporating tube of the refrigerator is iced or not is judged by using the capacitive proximity switch; the capacitive proximity switch is mounted close to, but at a moderate distance from, the evaporator tube (in particular, between 0.5mm and 8mm above the evaporator tube); the refrigerator is a device which has a compressor, an evaporator, a refrigerant and a heat preservation box body and can keep the temperature of a specific space within a certain range; the capacitance type proximity switch consists of an electrode plate system and a signal processing system, when an evaporation tube of the refrigerator is frozen, the capacitance of the electrode plate system is changed, and the signal processing system converts the capacitance change into a switching value signal to be input into an input I/O (input/output) of a microcomputer of the refrigerator; the capacitive proximity switch and the capacitive proximity sensor are substantially identical products, collectively referred to herein as a capacitive proximity switch.
Description
Technical Field
The present invention belongs to the technical field of refrigeration equipment.
Background
The freezing chamber of the refrigerator is frozen, so that the refrigeration efficiency is low and the energy consumption is increased. The existing method for detecting icing of the refrigerator comprises the following steps: or detecting power change, or accumulating door opening times, or judging icing by using a diffuse reflection photoelectric switch or a shielding type photoelectric switch, or detecting temperature change, wherein the methods either increase energy consumption, or have poor effect or complex structure, and have larger influence of water drops or foreign matters.
Disclosure of Invention
The invention relates to a new application of an existing product capacitive proximity switch in detecting an icing state of a refrigerator, wherein the capacitive proximity switch and a capacitive proximity sensor are products which are practically the same, and are collectively called as capacitive proximity switches.
The power supply input end of the capacitive proximity switch is connected with a power supply module of the refrigerator, and the power supply module of the refrigerator supplies power to the capacitive proximity switch after voltage reduction and rectification.
The capacitance type proximity switch consists of a conductive polar plate system, a resonance circuit, an F/V conversion circuit, a differential amplification circuit and other signal processing systems; after the refrigerator evaporating pipe is frozen, ice becomes a medium between electrode plates of the capacitive proximity switch, the electrostatic field distribution in an electrode plate system is changed, and a signal processing system converts capacitance change into a switching value signal after resonance, F/V conversion and differential amplification and inputs the switching value signal into a refrigerator microcomputer input I/O; the microcomputer of the refrigerator is composed of a central processing unit CPU, a register RAM, a memory ROM and the like, and the deicing device is controlled by the output I/O after the data of the input I/O is processed by the CPU.
The capacitive proximity switch is radially arranged above or on the side surface of an evaporation tube of the refrigerator in a short distance, and is adjusted to a proper distance (particularly, the distance is between 0.5mm and 8mm above the evaporation tube), so that the capacitive proximity switch is close to a trigger critical value, the capacitive proximity switch is in a non-icing state, and after icing, the dielectric constant between a polar plate of the capacitive proximity switch and the evaporation tube changes to cause capacitance change, the capacitive proximity switch is triggered, and an icing signal is sent.
The capacitive proximity switch shell is provided with threads and a locking nut, the threads are used for adjusting the distance between the capacitive proximity switch and the evaporation tube for detecting the frozen object to the optimal distance, and the locking nut is used for fixing the installation position of the capacitive proximity switch.
The invention has the advantages of less influence on icing detection caused by water drops, water films and foreign matters entering and simple structure.
Drawings
FIG. 1 is a schematic view of an installation of an evaporator tube and a capacitive proximity switch of a refrigerator;
FIG. 2 is a diagram of a system for detecting icing in an evaporator tube of a refrigerator;
in the drawings: the number 1 is a sectional view of an evaporation tube of the refrigerator, the number 2 is a capacitance type proximity switch, the number 3 is an ice layer on the evaporation tube, the number 4 is a microcomputer of the refrigerator, and the number 5 is a deicing device.
Detailed Description
The microcomputer of the refrigerator can be a local terminal such as a singlechip and a PC, and can also be controlled by a cloud.
The capacitive proximity switch is fixed on the refrigerator main body by a support and is firmly installed, and the vibration, the shaking or the movement can cause false alarm. In order to reduce the influence of water drops and foreign matters, the proportion of the area of a polar plate of the capacitance type proximity switch to the sectional area of the water drops is required to be enlarged as much as possible, the size of the water drops is generally in a certain range, in other words, the area of the polar plate of the capacitance type proximity switch is required to be enlarged as much as possible, the position of an evaporation tube opposite to the polar plate of the capacitance type proximity switch is made into a local plane by a cylindrical surface so as to increase the relative area between the evaporation tube and the capacitance type proximity switch, and ice is accumulated on the evaporation tube, in other words, the area of the detected ice can be increased.
To avoid the impact of water droplets, foreign objects or surrounding objects on the capacitive proximity switch, a shield may be installed to the capacitive proximity switch.
Claims (1)
1. A refrigerator for detecting icing by using a capacitance type proximity switch is characterized in that whether an evaporation tube of the refrigerator is iced or not is judged by using the capacitance type proximity switch, wherein the refrigerator is a device which has a compressor, an evaporator, a refrigerant and a heat preservation box body and can keep the temperature of a specific space within a certain range; said ice bloom refers to ice or (and) frost; the capacitive proximity switch is mounted close to, but at a moderate distance from, the evaporator tube (in particular, between 0.5mm and 8mm above the evaporator tube); the capacitive proximity switch consists of an electrode plate system and a signal processing system, when the refrigerator evaporating pipe is frozen, the capacitance of the electrode plate system is changed, and the signal processing system converts the capacitance change into a switching value signal to be used as a refrigerator freezing signal to be input to a control panel of the refrigerator; the capacitive proximity switch and the capacitive proximity sensor are substantially identical products, collectively referred to herein as a capacitive proximity switch.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2019108369820 | 2019-09-05 | ||
CN201910836982 | 2019-09-05 |
Publications (1)
Publication Number | Publication Date |
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CN110608569A true CN110608569A (en) | 2019-12-24 |
Family
ID=68895662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201911049686.2A Pending CN110608569A (en) | 2019-09-05 | 2019-10-31 | Refrigerator for detecting icing by using capacitive proximity switch |
Country Status (1)
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CN (1) | CN110608569A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115325766A (en) * | 2021-05-10 | 2022-11-11 | 青岛海尔电冰箱有限公司 | Control method and control system of ice making device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106500582A (en) * | 2016-11-23 | 2017-03-15 | 合肥市芯海电子科技有限公司 | A kind of solidifying frost detection means of refrigerator condenser type and detection method |
CN107367529A (en) * | 2017-08-15 | 2017-11-21 | 芯海科技(深圳)股份有限公司 | Coagulate white sensor and with the evaporator for coagulating white detection function |
CN107388700A (en) * | 2017-01-20 | 2017-11-24 | 芯海科技(深圳)股份有限公司 | A kind of refrigerator coagulates white sensor |
CN207268557U (en) * | 2017-09-06 | 2018-04-24 | 芯海科技(深圳)股份有限公司 | A kind of condenser type refrigerator coagulates white sensor detection circuit |
-
2019
- 2019-10-31 CN CN201911049686.2A patent/CN110608569A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106500582A (en) * | 2016-11-23 | 2017-03-15 | 合肥市芯海电子科技有限公司 | A kind of solidifying frost detection means of refrigerator condenser type and detection method |
CN107388700A (en) * | 2017-01-20 | 2017-11-24 | 芯海科技(深圳)股份有限公司 | A kind of refrigerator coagulates white sensor |
CN107367529A (en) * | 2017-08-15 | 2017-11-21 | 芯海科技(深圳)股份有限公司 | Coagulate white sensor and with the evaporator for coagulating white detection function |
CN207268557U (en) * | 2017-09-06 | 2018-04-24 | 芯海科技(深圳)股份有限公司 | A kind of condenser type refrigerator coagulates white sensor detection circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115325766A (en) * | 2021-05-10 | 2022-11-11 | 青岛海尔电冰箱有限公司 | Control method and control system of ice making device |
CN115325766B (en) * | 2021-05-10 | 2023-11-03 | 青岛海尔电冰箱有限公司 | Control method and control system of ice making device |
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Application publication date: 20191224 |