CN110608569A

CN110608569A - Refrigerator for detecting icing by using capacitive proximity switch

Info

Publication number: CN110608569A
Application number: CN201911049686.2A
Authority: CN
Inventors: 邹庆丰
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-05
Filing date: 2019-10-31
Publication date: 2019-12-24

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

Refrigerator for detecting icing by using capacitive proximity switch

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. 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.