CN107367529B - Frost sensor and evaporator with frost detection function - Google Patents
Frost sensor and evaporator with frost detection function Download PDFInfo
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- CN107367529B CN107367529B CN201710695576.8A CN201710695576A CN107367529B CN 107367529 B CN107367529 B CN 107367529B CN 201710695576 A CN201710695576 A CN 201710695576A CN 107367529 B CN107367529 B CN 107367529B
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- frost
- metal pole
- sensor
- capacitor
- pole piece
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/02—Detecting the presence of frost or condensate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
Abstract
The invention discloses a frost sensor and an evaporator with a frost detection function. The frost sensor is buckled on the evaporating pipe through a fastening limiting part, and the connecting rod is parallel to the evaporating pipe; a vertical angle is formed between the metal pole piece and the evaporation tube, and a gap is formed between the metal pole piece and the evaporation tube; the filler fills the space between the metal pole pieces of the reference flat capacitor and covers the evaporation tube at the corresponding position. The invention makes full use of the frost-condensation mechanism of the original structure of the evaporator of the refrigeration equipment, organically combines the sensor and the evaporator, reduces the cost, improves the structural integrity and enhances the reliability and the sensitivity of the sensor.
Description
Technical Field
The invention belongs to the technical field of refrigeration equipment, and particularly relates to a sensor and an evaporator applied to frost detection of the refrigeration equipment.
Background
In the application of refrigeration equipment such as refrigerators and the like, the surface temperature of an evaporator used for refrigeration and heat exchange is below zero; when moisture is present in the air, frost is easily formed and attached to the evaporator. After frosting on the evaporator, the refrigeration efficiency can be seriously influenced, the refrigeration effect of refrigeration equipment such as a refrigerator is poor, and meanwhile, the power consumption is increased.
In the prior art, the refrigerator heats and defrosts the evaporator at regular time through the heating device, which obviously increases the power consumption of the refrigerator and has poor effect; for example, the timer may not initiate heater defrost when defrost is required; and the heating is started instead when defrosting is not needed, so that the waste of electric energy is caused.
In order to save electric power and improve defrosting effect, it is necessary to activate the heater for defrosting when frost is detected and existence of frost is confirmed.
The prior patent application 201611046700.X describes a refrigerator capacitive frost detection device and detection method, the device comprising: the device comprises an evaporator, a detection panel capacitor, a reference panel capacitor and a signal conversion device, wherein the detection panel capacitor and the reference panel capacitor are at least provided with two conductive pole plates which are oppositely arranged in parallel and physically contact with an evaporation tube, and the signal conversion device is electrically connected with the detection panel capacitor and the reference panel capacitor and converts the capacitance values of the detection panel capacitor and the reference panel capacitor into digital signals. The invention fully utilizes the original structure of the refrigerator evaporator, can effectively reduce the complexity and the volume of a frost detection structure, reduce the cost and improve the detection accuracy, thereby improving the defrosting effect of the refrigerator, improving the refrigeration efficiency and saving the electric energy. In the scheme, the integrity of the frost sensor is poor, the parts need to be connected by means of screws, or the electric connection needs to be realized by means of wires, so that the sensor has the advantages of more parts, complex production, low structural reliability, increased cost and reduced reliability. In addition, the structure frost efficiency in the above-mentioned application is not high, and the frost difference of the frost and the refrigeration plant evaporimeter reality of sensor inside is great, leads to the sensor can not really detect the frost condition of evaporimeter.
Disclosure of Invention
Therefore, the invention provides a frost sensor and an evaporator with a frost detection function, which are used for refrigeration equipment, can improve structural integrity, avoid the use of wires and screws, reduce cost, improve reliability, and improve frost efficiency and detection sensitivity.
Another object of the present invention is to provide a frost sensor and an evaporator with a frost detecting function, wherein the sensor and the evaporator fully utilize the frost mechanism of the original structure of the evaporator of the refrigeration equipment through the structural improvement, the whole structure has no lead and no screw, the structural member and the electric member are reused, and the improvement of the existing command equipment is facilitated.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a frost sensor, this sensor is including detecting panel capacitor, and this sensor of its characterized in that is still including fastening locating part, connecting rod and signal processing device, wherein:
the detection flat capacitor is formed by arranging at least two metal pole pieces in parallel;
fastening a limiting part: the sensor is made of an insulating material and used for clamping the sensor on an object to be detected and limiting the distance between the metal pole piece and the surface of the object to be detected;
the connecting rod is used for fixing the metal pole pieces and the fastening limiting part into a whole, is made of a PCB, fixes the metal pole pieces through the through holes with the welding discs, and electrically connects the metal pole pieces to the signal processing circuit through the welding discs and the PCB conductive routing;
a signal processing device: the capacitance digital converter is electrically connected with two polar plates of the detection panel capacitor and is used for converting the capacitance value of the detection panel capacitor into a digital signal;
preferably, the number of the PCB connecting rods is three, and each metal pole piece is fixed to three PCB connecting rods, thereby forming a triangular stable structure.
Preferably, the capacitor also comprises a reference flat capacitor which is composed of at least two metal pole pieces and a filling piece; the filling piece is used for preventing frost from entering the space in the panel capacitor; the capacitance digital converter is electrically connected with the two polar plates of the reference plate capacitor and is used for converting the capacitance value of the reference plate capacitor into a digital signal
Preferably, the fastening limiting piece enables a gap to be reserved between the metal pole piece and the surface of the object to be detected.
Preferably, the fastening limit piece and the filling piece are the same component.
Preferably, the detection flat capacitor is formed by connecting a plurality of sub-detection flat capacitors in parallel, and each sub-detection flat capacitor is formed by two metal pole pieces which are oppositely arranged in parallel; preferably, the sub-detection flat panel appliances can share the pole pieces with each other;
preferably, the reference plate capacitor is formed by connecting a plurality of sub-reference plate capacitors in parallel, and each sub-reference plate capacitor is formed by two metal pole pieces which are oppositely arranged in parallel; preferably, the sub-reference-plane appliances may share the plate with each other;
preferably, the detection plate capacitor and the reference plate capacitor share a capacitance electrode, which is a reference ground.
Preferably, the surface of the metal pole piece is subjected to tin plating treatment, so that the metal pole piece and a PCB (printed Circuit Board) pad can be conveniently welded.
An evaporator with a frost condensation detection function comprises an evaporation tube, fins and a support, wherein the evaporation tube is used for transporting condensate, the fins are connected with the evaporation tube in series and are mainly used for heat exchange, and the support mainly plays a role in fixing; the frost sensor is characterized by further comprising the frost sensor. The frost sensor is buckled on the evaporating pipe through a fastening limiting part, and the connecting rod is parallel to the evaporating pipe; a vertical angle is formed between the metal pole piece and the evaporation tube, and a gap is formed between the metal pole piece and the evaporation tube; the filler fills the space between the metal pole pieces of the reference flat capacitor and covers the evaporation tube at the corresponding position.
When the evaporator works, because the temperature on the evaporation tube is low, water vapor is condensed on the evaporation tube, thereby forming frost condensation, wherein the frost condensation comprises the surface of the evaporation tube at the position of a frost condensation sensor, particularly the frost condensation in the area between metal pole pieces of a detection panel capacitor, and the change of the capacity value of the panel capacitor can be caused; and because the evaporation tube at the corresponding position of the reference flat plate capacitor is covered by the filling piece and cannot contact water vapor, the reference flat plate capacitor is not influenced by frost. The capacitance values of the detection panel capacitor and the reference panel capacitor can be obtained through the signal processing device, so that the capacitance value of the detection panel capacitor is changed along with frost, the capacitance value of the reference panel capacitor is not changed along with frost, and the frost thickness can be indirectly obtained through the ratio of the two capacitance values. Because of the existence of the fastening limiting part and the gap between the metal pole piece and the evaporating pipe, the metal pole piece and the evaporating pipe are not in direct contact (an air gap or other non-metallic material fillers are left between the metal pole piece and the evaporating pipe), the heat transfer is poor, so that the frost on the metal pole piece is less than that on the evaporating pipe, and the evaporating pipe can better keep the original frost condensation characteristic when the sensor is not installed; thus, the sensor can detect the most authentic evaporator frost condition.
The frost sensor and the evaporator using the same fully utilize the frost mechanism of the original structure of the refrigeration equipment evaporator, and organically combine the sensor and the evaporator, so that the whole structure has no lead or screw, the structural member and the electric member are reused, the cost is reduced, the structural integrity is improved, and the reliability and the sensitivity of the sensor are enhanced.
Drawings
Fig. 1 is a schematic structural view of a frost sensor implemented in the present invention.
FIG. 2 is a schematic view of another angle frost sensor implemented in accordance with the present invention.
Fig. 3 is an equivalent electrical characteristic diagram of a frost sensor implemented in accordance with the present invention.
FIG. 4 is a schematic view of an evaporator with frost detection in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 and 2 are three-dimensional structural diagrams of an embodiment 100 of a frost sensor implemented by the present invention, where fig. 1 is a schematic diagram of a top view, and fig. 2 is a schematic diagram of a bottom view, and in the diagrams, metal pole pieces 101, 102, and 103 are arranged in parallel and fixed by connecting rods 105\106\ 107; the female seat 107 is made of metal, is hollowed out and is used for arranging a signal processing circuit, and meanwhile, the surfaces of two sides of the female seat are also used as metal pole pieces; the fastening stop 104 serves to fasten the entire sensor to the evaporator tube 108 and is also a filler of the plate capacitor. The metal pole piece, the connecting rod and the fastening limiting part are symmetrically arranged on two sides by taking the female seat as the center.
Two adjacent metal pole pieces in the frost sensor 100 constitute a plate capacitor: the metal pole piece 101 and the metal pole piece 103 form a detection plate capacitor 120, and the metal pole piece 102 and the metal pole piece 103 form a reference plate capacitor 130; the female socket 107 is used as the metal pole piece 103 in the same way in the electrical characteristic; the physical connection between the pole pieces is completed through connecting rods 105-107 made of a PCB, and meanwhile, the electrical characteristic connection is also completed through pads and conductive wires on the PCB connecting rods, for example, the metal pole piece 101 is electrically connected through the connecting rod 105, specifically through a pad 1051 and a corresponding wire, and is finally connected to a signal processing circuit 200 (see fig. 2) in the female socket 107; the metal pole piece 102 is electrically connected through the connecting bar 107, specifically through the bonding pad 1071 and the corresponding trace, and is finally connected to the signal processing circuit 200 inside the female socket 107.
The metal pole piece 103 is electrically connected through the connecting bar 106, specifically through the bonding pad 1061 and the corresponding trace, and finally connected to the signal processing circuit 200 inside the female socket 107. The capacitor electrodes of the reference plate capacitor 130 are filled with the fastening stoppers 104, so that frost is prevented from entering the capacitor electrodes, and the capacitor electrodes are used as a reference to keep the capacitance stable.
The fastening limiting member 104 is made of an insulating material, and is usually made of an engineering plastic with certain elasticity, such as POM \ PP material, and can be fastened on the evaporation tube 108 by a snap-fit manner. Metal pole piece and evaporating pipe are not direct contact, but keep having the clearance, for example 0.5mm, have the difference in temperature between metal pole piece and the evaporating pipe like this, and metal pole piece self frost is inefficient, thereby can not block the evaporating pipe frost that detects in the dull and stereotyped electric capacity space because of metal pole piece's frost congeals for the frost gets into and detects inside the dull and stereotyped electric capacity space, reaches the purpose that improves the frost volume, improvement sensitivity. The gap is set by fastening the stopper 104. The metal pole piece and the female seat can be made of aluminum, or the metal pole piece can be made of a copper sheet. A preferred option is to tin plate the metal pole pieces for ease of solder attachment to the bond pads of the tie bars and electrical connection.
As shown in fig. 3, which is an equivalent electrical characteristic diagram of the frost sensor 100, the upper and lower plates of the detection plate capacitor 120 are metal pole pieces 101 and 103, respectively, wherein the upper plate corresponds to an electrical node, i.e., NETA, and the lower plate corresponds to an electrical node, i.e., GND, that is, the ground of the circuit; the upper and lower electrode plates of the reference plate capacitor 130 are respectively a metal pole piece 102 and a metal pole piece 103, the electrical node of the upper electrode plate is NETB, the electrical node of the lower electrode plate is GND, and the capacitor space is filled by a fastening limiting piece 104.
The upper and lower plates of the capacitor 120 and the capacitor 130 are connected to the signal processing circuit 200, and only 3 signal lines are required because GND is common ground. In the sensor 100, the 3 signal lines are routed through 3 connecting rods 105 to 107, respectively. The signal processing circuit 200 is mainly a CDC circuit, which is a capacitance digital converter, and can convert capacitance values of the capacitor 120 and the capacitor 130 into digital signals for identification by a subsequent processor MCU and the like. Generally, the frost is judged by comparing the values of the capacitor 120 and the capacitor 130. Because the reference capacitor 130 does not frost inside, the capacitance value is basically unchanged, the detection capacitor 120 frosts inside, the medium changes, and the capacitance value changes, so the frosting state can be judged and determined according to the ratio of the capacitor 120 to the capacitor 130. In the case where the reference capacitor 130 is not provided, the frost formation can be determined and measured by directly using the capacitance value of the capacitor 120.
As shown in fig. 4, the evaporator 300 with a frost detecting function can be implemented by mounting the frost sensor 100 on the evaporation tube 301 of the evaporator 300. The metal pole piece on the frost sensor 100 and the fin 303 on the evaporator 300 remain parallel.
In a word, the frost sensor avoids great change to the original evaporator through the externally hung installation, and the sensor has high integrity through the combination of physical connection and electrical connection, thereby saving the use of screws and wires, reducing the cost and enhancing the reliability; meanwhile, the evaporation tube is used as one part of the sensor, so that the original frost condensation characteristic of the evaporator is not changed, and the frost condensation of the evaporator is really detected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a frost sensor, this sensor is including detecting panel capacitor, and this sensor of its characterized in that is still including fastening locating part, connecting rod and signal processing device, wherein:
the detection flat capacitor is formed by arranging at least two metal pole pieces in parallel;
fastening a limiting part: the sensor is made of an insulating material and used for clamping the sensor on an object to be detected and limiting the distance between the metal pole piece and the surface of the object to be detected;
the connecting rod is used for fixing the metal pole pieces and the fastening limiting part into a whole, is made of a PCB, fixes the metal pole pieces through the through holes with the welding discs, and electrically connects the metal pole pieces to the signal processing circuit through the welding discs and the PCB conductive routing;
a signal processing device: the capacitance digital converter is electrically connected with two polar plates of the detection panel capacitor and is used for converting the capacitance value of the detection panel capacitor into a digital signal.
2. The frost sensor of claim 1, wherein the PCB connector bar has three bars, and each metal pole piece is secured to three PCB connector bars to form a triangular stabilizing structure.
3. The frost sensor of claim 1 further comprising a reference plate capacitor, said reference plate capacitor comprising at least two metal pole pieces, a filler; the filling piece is used for preventing frost from entering the space in the panel capacitor; the capacitance digital converter is electrically connected with the two polar plates of the reference plate capacitor and is used for converting the capacitance value of the reference plate capacitor into a digital signal.
4. The frost sensor of claim 3, wherein the securing stop leaves a gap between the metal pole piece and the surface of the object to be sensed.
5. The frost sensor of claim 4, wherein the securing stop and the filler are the same component.
6. The frost sensor of claim 1, wherein the sensing plate capacitor comprises a plurality of sub-sensing plate capacitors connected in parallel, each sub-sensing plate capacitor comprises two metal pole pieces disposed in parallel, and the sub-sensing plate capacitors share a common pole piece.
7. The frost sensor of claim 5, wherein the reference plate capacitor is formed by a plurality of sub-reference plate capacitors connected in parallel, each sub-reference plate capacitor is formed by two metal pole pieces arranged in parallel and the sub-reference plate capacitors share a common pole plate with each other.
8. The frost sensor of claim 7, wherein the sensing plate capacitor and the reference plate capacitor share a common capacitive electrode, the capacitive electrode being a reference ground.
9. The frost sensor of claim 1, wherein the surface of the metal pole piece is tinned to facilitate soldering of the metal pole piece to a PCB pad.
10. An evaporator with a frost condensation detection function comprises an evaporation tube, fins and a support, wherein the evaporation tube is used for transporting condensate, the fins are connected with the evaporation tube in series and are mainly used for heat exchange, and the support mainly plays a role in fixing; the frost sensor is characterized in that the evaporator is provided with the frost sensor as claimed in claim 1, the frost sensor is buckled on the evaporating pipe through a fastening limiting part, and the connecting rod is parallel to the evaporating pipe; a vertical angle is formed between the metal pole piece and the evaporation tube, and a gap is formed between the metal pole piece and the evaporation tube; the frost sensor also comprises a reference flat capacitor, wherein the reference flat capacitor is composed of at least two metal pole pieces and a filling piece; the filling piece is used for preventing frost from entering the space in the panel capacitor; the filler fills the space between the metal pole pieces of the reference flat capacitor and covers the evaporation tube at the corresponding position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695576.8A CN107367529B (en) | 2017-08-15 | 2017-08-15 | Frost sensor and evaporator with frost detection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710695576.8A CN107367529B (en) | 2017-08-15 | 2017-08-15 | Frost sensor and evaporator with frost detection function |
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| CN107367529A CN107367529A (en) | 2017-11-21 |
| CN107367529B true CN107367529B (en) | 2020-11-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109059355B (en) * | 2018-07-20 | 2021-02-26 | 广东美的制冷设备有限公司 | Heat exchanger frosting detection device, heat exchanger, air conditioner and defrosting control method of air conditioner |
| CN108981271B (en) * | 2018-08-27 | 2023-11-03 | 天津商业大学 | Capacitive intelligent defrosting device and control method |
| CN110608569A (en) * | 2019-09-05 | 2019-12-24 | 邹庆丰 | Refrigerator for detecting icing by using capacitive proximity switch |
| CN113324467B (en) * | 2021-05-27 | 2023-03-31 | 贵州电网有限责任公司 | Device and method for monitoring equivalent icing thickness of lead based on ice dielectric capacitance effect |
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| CN87207535U (en) * | 1987-04-29 | 1987-12-31 | 王紫来 | Frost thickness capacitance sensor used in a refrigerating system |
| CN1208461A (en) * | 1996-02-06 | 1999-02-17 | 石塚电子株式会社 | Frost formation detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0213774A (en) * | 1988-06-30 | 1990-01-18 | Toshiba Corp | Frosting/defrosting detecting device and refrigerator |
| CN204300774U (en) * | 2014-12-26 | 2015-04-29 | 杨晟 | A kind of LED lighthouse |
| CN105300009A (en) * | 2015-11-05 | 2016-02-03 | 顺德职业技术学院 | Positioning device for defrosting temperature sensing head of heat exchanger |
| CN106500582B (en) * | 2016-11-23 | 2020-04-07 | 合肥市芯海电子科技有限公司 | Refrigerator capacitive type frost detection device and detection method |
| CN207611009U (en) * | 2017-08-15 | 2018-07-13 | 芯海科技（深圳）股份有限公司 | Coagulate frost sensor and the evaporator with solidifying white detection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87207535U (en) * | 1987-04-29 | 1987-12-31 | 王紫来 | Frost thickness capacitance sensor used in a refrigerating system |
| CN1208461A (en) * | 1996-02-06 | 1999-02-17 | 石塚电子株式会社 | Frost formation detector |
| CN101285673A (en) * | 2008-06-06 | 2008-10-15 | 太原理工大学 | Capacitance ratio type ice-covering thickness sensor and its detection method |
| CN102177446A (en) * | 2008-08-26 | 2011-09-07 | 伊沃普欧公司 | Ice thickness probe, ice thickness probe assembly and ice thickness monitoring apparatus |
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