CN207648895U - A kind of range hood - Google Patents
A kind of range hood Download PDFInfo
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- CN207648895U CN207648895U CN201721696260.2U CN201721696260U CN207648895U CN 207648895 U CN207648895 U CN 207648895U CN 201721696260 U CN201721696260 U CN 201721696260U CN 207648895 U CN207648895 U CN 207648895U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
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- 229910052742 iron Inorganic materials 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
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- Check Valves (AREA)
Abstract
The utility model provides a kind of range hood, including the check-valves being arranged at air outlet, check-valves includes two valve discs being rotatably opened and closed and the positive conductive plate being arranged on the apparent surface of two valve discs and negative conductive plate, and positive conductive plate and the negative conductive plate form type variable capacitance；Range hood further includes non-return valve detection device, and the opening and closing of check-valves can be judged according to the variation of the capacitance of type variable capacitance.The utility model provides a kind of range hood with check-valves intelligent detecting function based on capacitive sensing technology, it may be used on machine for kitchen use field, by installing conductive plate on two valve discs of check-valves, constitute a kind of type variable capacitive means, by non-return valve detection device can real-time judge check-valves normal work when whether normally opened or closed, and by being optimized to the material, shape of conductive plate, assembling and mounting means on valve disc, fully ensure that systematic survey has high-precision and high reliability.
Description
Technical Field
The utility model relates to a kitchen appliances field, in particular to range hood.
Background
At present, the air outlet of the kitchen range hood is generally provided with a check valve which can close or open the air outlet. When the range hood exhausts, the check valve opens the air outlet to discharge the oil smoke into the common flue; when the range hood does not work, the check valve closes the air outlet to prevent the oil smoke in the public flue from flowing backwards, so that the normal opening and closing of the check valve has important significance.
SUMMERY OF THE UTILITY MODEL
Based on above-mentioned range hood's structure of check valve, the utility model provides a range hood with check valve intellectual detection system function based on capacitanc sensing technology, through the electrically conductive polar plate of installation above two valve leaves at the check valve, form a variable capacitance device to designed the check valve detection device with intellectual detection system function, can judge whether the check valve of range hood has normally opened or normally closed under the condition of normal work in real time through check valve detection device, make range hood's performance better.
In order to achieve the purpose of the utility model, the utility model discloses the technical scheme who takes as follows:
the utility model provides a range hood, which comprises a check valve arranged at an air outlet, wherein the check valve comprises two valve leaves which can be opened and closed in a rotating way, and a positive conductive polar plate and a negative conductive polar plate which are arranged on the opposite surfaces of the two valve leaves, and the positive conductive polar plate and the negative conductive polar plate form a variable capacitor;
the range hood further comprises a check valve detection device, and the check valve detection device can judge the opening and closing of the check valve according to the change of the capacitance value of the variable capacitor.
The utility model provides a range hood, check valve install in air outlet department, are provided with the two valve leafs of rotatable switching on it, and the switching that two valve leafs can realize two valve leafs is rotated to two valve leafs, and then control opening and closure of check valve. The opposite surfaces of the two valve blades are respectively provided with a positive conductive polar plate and a negative conductive polar plate, and a variable capacitor is formed between the oppositely arranged positive and negative conductive polar plates.
When two valve vanes on the check valve rotate to open and close, the positive and negative conductive plates can be driven to synchronously rotate, so that the relative effective area between the positive conductive plate and the negative conductive plate is changed, and the capacitance value of a variable capacitor formed by the positive and negative conductive plates is changed; the check valve detection device outputs corresponding signals according to different capacitance values, so that whether the check valve is normally opened or closed under the condition that the range hood normally works is judged, and the intelligent detection of the state of the check valve is realized.
Specifically, the theoretical calculation formula of the capacitance value of the capacitor is as follows: c = epsilon S/pi kd, where epsilon is the dielectric constant between the positive and negative conductive plates, d is the relative distance between the positive and negative conductive plates, and S is the area of the positive and negative conductive plates.
According to the above formula, when other parameters are constant, the capacitance of the capacitor is proportional to the area of the positive and negative conductive plates. Here, the area of the positive and negative conductive plates refers to the effective area of the plates facing each other. Due to the existence of the positive and negative conductive polar plates symmetrically arranged on the two valve leaves of the check valve, when the check valve is completely opened, the two valve leaves are completely opposite, namely the positive and negative conductive polar plates on the two valve leaves are completely opposite, the opposite effective area between the positive and negative conductive polar plates of the capacitor is the largest, and the capacitance value of the capacitor is the largest; when the check valve is completely closed, the two valve leaves are completely separated, namely, the positive and negative conductive electrode plates on the two valve leaves are completely separated, the relative effective area between the positive and negative conductive electrode plates of the capacitor is zero, and the capacitance value is minimum. The check valve detection device can judge whether the check valve is in an open state or a closed state according to different capacitance values.
In this embodiment, the variable capacitor formed by the positive and negative conductive plates and the check valve detection device are used in cooperation to detect the opening and closing of the check valve, so that the variable capacitor and the check valve detection device can form an intelligent check valve detection system.
Optionally, a rotating shaft is disposed at one end of each of the two adjacent valve leaves, the positive conductive electrode plate and the negative conductive electrode plate are close to the rotating shaft, a positive lead-out wire of the positive conductive electrode plate is led out from one side of the check valve along the rotating shaft and is connected with the check valve detection device, and a negative lead-out wire of the negative conductive electrode plate is led out from one side of the check valve along the rotating shaft and is connected with the check valve detection device.
In the check valve, a rotating shaft is respectively arranged at one adjacent end of two valve blades, and the two valve blades are rotatably fixed on a valve body of the check valve through the rotating shaft and can be rotatably opened and closed. Meanwhile, the positive conductive electrode plate and the negative conductive electrode plate are also arranged at positions close to the rotating shaft, so that a positive lead-out wire on the positive conductive electrode plate is led out from one side of the check valve along the rotating shaft and is connected with a capacitance interface of the check valve detection device, a negative lead-out wire of the negative conductive electrode plate is led out from one side of the check valve along the rotating shaft and is connected with a capacitance interface of the check valve detection device, and the positive conductive electrode plate, the negative conductive electrode plate and the check valve detection device are connected through the positive lead-out wire and the negative lead-out wire to form a closed circuit loop. When the power supply is switched on, the variable capacitor can be charged and discharged, the check valve detection device judges the opening and closing state of the check valve according to the changed capacitance value, and the intelligent check valve detection system based on the capacitance sensing technology is realized.
In addition, the installation position of the positive and negative conductive pole plates has influence on the detection sensitivity of the check valve detection device, and the positive and negative conductive pole plates are arranged close to the rotating shaft, so that the detection sensitivity of the check valve detection device is improved.
Optionally, the sum S of the areas of the opposing surfaces of the positive and negative conductive platesJBThe relation S between the sum of the areas of the opposite surfaces of the two valve blades, which are provided with the positive conductive polar plate and the negative conductive polar plate, is as follows: sJB≥10%×S。
The sum S of the areas of the opposite surfaces of the positive and negative conductive electrode plates on the two valve vanes of the check valve is testedJBMust be controlled to be more than 10% of the sum S of the areas of the opposed surfaces of the two valve vanes, i.e. SJBThe sensitivity requirement of the check valve detection device can be met only when the detection time is more than or equal to 10% multiplied by S. If the sum S of the areas of the opposing surfaces of the positive and negative conductive platesJBIf the capacitance value of the variable capacitor formed by the positive and negative conductive plates is too small, the capacitance value is not accurately detected by the check valve detection device, and the sensitivity requirement of the check valve detection device cannot be met, so that the opening and closing conditions of the check valve cannot be accurately known.
Optionally, the positive conductive plate is rectangular, semicircular or semi-elliptical;
or, the negative conductive polar plate is rectangular, semicircular or semi-elliptical.
The positive and negative conductive pole plates can be designed into a rectangular shape, a semicircular shape or an elliptical shape according to the detection sensitivity requirement of the check valve detection device, and further, the positive and negative conductive pole plates can be set to be the same in shape and size and are symmetrically and oppositely arranged on two valve leaves of the check valve.
When the positive and negative conductive pole plates are designed to be rectangular, the design is convenient for cutting and installation, and in order to prevent corners from raising, the corners of the rectangle can be designed to be round corners; when the positive and negative conductive plates are designed to be arc-shaped, the corners of the positive and negative conductive plates can be effectively prevented from being raised, so that the formed capacitor is stable and reliable, and if the positive and negative conductive plates can be designed to be semi-elliptical, the positive and negative conductive plates can also be designed to be semi-circular; of course, the electrode plate can be designed into any other shape, which is not described herein.
Optionally, the positive conductive electrode plate is a copper plate, an aluminum plate, an iron plate or an aluminum foil;
or the negative conductive polar plate is a copper plate, an aluminum plate, an iron plate or an aluminum foil.
The positive and negative conductive polar plates on the valve leaf have the characteristic requirement that the requirements can be met as long as the conductive characteristics are met, no special requirement is required for specific materials, and the positive and negative conductive polar plates in the embodiment can be designed to be copper plates, aluminum plates, iron plates or aluminum foils.
When the copper pole plate is adopted as the positive and negative conducting pole plate to be fixed on the valve leaf, the conducting performance of copper is good, so that the check valve detection device is high in sensitivity, but the price of copper is high.
When the aluminum pole plate is adopted as the positive and negative conducting pole plate to be fixed on the valve vane, the conductivity of aluminum is good, so that the sensitivity of the check valve detection device is high, and the price of aluminum is moderate.
When the iron pole plate is used as the positive and negative conductive pole plate to be fixed on the valve leaf, the conductivity of iron is moderate, so that the sensitivity of the check valve detection device is moderate, and the price of iron is low.
When the aluminum foil paper is used as the positive and negative conductive pole plates to be adhered to the valve leaf, the conductivity of the aluminum foil is general, so that the sensitivity of the check valve detection device is general, the price of the aluminum foil is very low, and the aluminum foil is not easy to install and is easy to damage.
Optionally, the positive conductive pole plate and the negative conductive pole plate are respectively fixed with the corresponding valve leaves by gluing or clamping;
or the positive conductive polar plate and the negative conductive polar plate are conductive layers coated on the two valve blades;
or, the two valve leaves are made of metal materials and are respectively used as the positive conductive pole plate and the negative conductive pole plate.
In this embodiment, the positive conductive electrode plate and the negative conductive electrode plate can be fixed with the corresponding valve leaves respectively by gluing or clamping, that is, the conductive metal electrode plate is directly fixed on the valve leaves by gluing, and then is led out along the rotating shaft through the positive and negative lead-out wires; the gluing mode can adopt strong glue and the like for pasting, and can also adopt other glue, thereby enhancing the installation firmness of the positive and negative conductive pole plates on the valve leaf.
Or, the surfaces of the two valve leaves can be coated with conducting layers respectively to serve as a positive conducting pole plate and a negative conducting pole plate, then the positive and negative outgoing lines are connected with the conducting layers in a viscose mode, and meanwhile, the surfaces of the conducting layers can be subjected to paint spraying treatment, so that the conducting layers are prevented from being scratched, and the reliability of the positive and negative conducting pole plates is further improved.
Or, the two valve leaves can be directly made of metal materials, so that the two valve leaves are respectively used as a positive conductive pole plate and a negative conductive pole plate, the structural complexity can be reduced, the processing and manufacturing procedures are reduced, the whole valve leaf is used as the positive and negative conductive pole plates, the relative effective area between the positive and negative conductive pole plates is favorably increased, and the detection sensitivity of the check valve detection device is further improved.
Optionally, the two valve vanes are horizontally arranged, can be rotated and opened under the action of wind power, and can be rotated and closed under the action of self gravity;
or the two valve blades are driven to rotate by a motor respectively.
The check valve is arranged at the air outlet, two semicircular valve blades capable of being opened and closed in a rotating mode are horizontally arranged on the check valve, after the range hood is started, the fan is started, air pressure can be formed at the air outlet, the two valve blades can be opened in a rotating mode along the rotating shaft, and after the fan is closed, the valve blades are naturally closed due to self gravity.
Alternatively, the rotation opening and closing of the two valve leaves on the check valve can be controlled by the driving of a motor. The check valve also adopts two valve leaves with the same shape and is rotatably connected on the valve body through a rotating shaft, the rotating shaft is connected with an output shaft of the motor through a transmission mechanism (such as a gear transmission mechanism), and the motor is adopted to drive the valve leaves to move.
Optionally, the check valve detection device includes an oscillation circuit module and a control unit module, the oscillation circuit may output a rectangular wave with a certain frequency according to a capacitance value of the variable capacitor, and the control unit module determines a current state of the check valve according to a frequency of the rectangular wave output by the oscillation circuit module.
The range hood of this embodiment, check valve detection device includes oscillating circuit module and the control unit module. The oscillation circuit module can output a rectangular wave with a certain frequency at the output end according to the capacitance value of the variable capacitor. When the capacitance value of the variable capacitor is changed, correspondingly, the frequency of the rectangular wave output by the output end of the oscillating circuit module is changed; the control unit module can judge the current state of the check valve by detecting the frequency of the rectangular wave output by the oscillation circuit module.
Optionally, the oscillation circuit module includes: the circuit comprises a time base oscillation chip, a first resistor, a second resistor and an anti-interference capacitor, wherein the time base oscillation chip is provided with 8 pins; wherein,
the time base oscillation chip comprises a pin 8, a pin 4 and a first end of a first resistor, wherein the pin 8 and the pin 4 are connected to a power supply, the second end of the first resistor is connected with the first end of a second resistor, the second end of the second resistor is connected with a positive conductive plate, a negative conductive plate is grounded, a pin 7 of the time base oscillation chip is connected between the first resistor and the second resistor, a pin 2 and a pin 6 are connected between the second resistor and the positive conductive plate, a pin 1 of the time base oscillation chip is grounded, a pin 5 is connected in series with a back ground of an anti-interference capacitor, and a pin 3 is an output end.
In the above-mentioned oscillating circuit module, when the capacitance value of the variable capacitor is not changed, the oscillating circuit module outputs a rectangular wave of a constant frequency; when the capacitance value of the variable capacitor changes, the frequency of the rectangular wave output by the oscillation circuit module changes. Specifically, when the capacitance value increases, the frequency of the rectangular wave output by the oscillation circuit module decreases, and when the capacitance value decreases, the frequency of the rectangular wave output by the oscillation circuit module increases; the control unit module judges whether the check valve is in an open or closed state at present according to the frequency of the rectangular wave.
Optionally, the check valve detection device further comprises an alarm module, and when the check valve is abnormally opened or closed, the alarm module automatically alarms.
When the check valve is opened or closed abnormally, the alarm module can give an alarm in time to inform a user of maintaining in time.
The utility model provides a range hood's concrete theory of operation as follows:
after the range hood is started, the check valve at the air outlet can be rotationally opened and closed under the action of wind power or the rotation driven by the motor.
When the two valve leaves rotate to open, the two valve leaves are parallel and opposite, correspondingly, the positive and negative conductive pole plates are also kept parallel and opposite, the effective area of the opposite surfaces of the positive and negative conductive pole plates is the largest, namely the capacitance value of a variable capacitor formed by the positive and negative conductive pole plates is the largest, the oscillating circuit module outputs rectangular waves (with the smallest frequency) with corresponding frequency according to the capacitance value (with the largest capacitance value) of the variable capacitor, and then the control unit module judges that the check valve is in a normal opening state currently according to the frequency of the output end of the oscillating circuit module;
when the two valve vanes are closed in a rotating mode, the effective area of the opposite surfaces of the positive and negative conductive electrode plates is approximately zero, namely the capacitance value of the variable capacitor is approximately zero, the period of a rectangular wave output by the output end of the oscillating circuit can be regarded as infinitesimal, the frequency can be regarded as infinite, and the control unit module judges that the check valve is in a completely closed state currently according to the linear signal;
in the process that the two valve blades rotate to open, the effective area of the opposite surface between the positive conductive polar plate and the negative conductive polar plate is increased, the capacitance value of the variable capacitor is gradually increased, and the frequency of the rectangular wave output by the output end of the oscillating circuit module is gradually reduced; on the contrary, in the process that the two valve blades rotate to close, the effective area of the opposite surface between the positive and negative conductive pole plates is reduced, and the frequency of the rectangular wave output by the output end of the oscillating circuit module is increased. The control unit module can judge whether the check valve is currently in the opening process or the closing process according to the increase or decrease of the frequency of the rectangular wave, and judge the current opening degree of the check valve according to the frequency of the rectangular wave.
Compared with the prior art, the technical scheme of the utility model, following beneficial effect has:
1. the utility model designs a range hood with a check valve intelligent detection function based on a capacitance type sensing technology, which forms a variable capacitance device by installing positive and negative conductive polar plates on two valve leaves of the check valve, and judges whether the check valve is normally opened or normally closed under the condition of normal work in real time according to the change of capacitance values;
2. the utility model realizes the detection of high precision and high reliability of the check valve through the structural design of the positive and negative conductive polar plates arranged on the valve leaf;
3. the utility model selects a solution with high cost performance by testing and analyzing the material and the shape of the positive and negative conductive polar plates arranged on the valve leaf according to the structure of the valve leaf of the check valve, thereby realizing the accurate detection of the position of the valve leaf of the check valve;
4. the utility model discloses an equipment mode and mounted position to positive and negative conductive polar plate above the valve leaf carry out optimal design, under the prerequisite that fully guarantees check valve measurement system and have high accuracy and high reliability, solve the problem that positive and negative conductive polar plate mounting structure is complicated, realize the convenient installation of positive and negative conductive polar plate on the valve leaf.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.
Fig. 1 is a schematic structural diagram of a check valve of a range hood according to an embodiment of the present invention;
FIGS. 2a and 2b are schematic structural views of the check valve shown in FIG. 1 in an open state and a closed state, respectively;
FIG. 3 is a schematic view of the structure of the check valve shown in FIG. 1 during rotation of the upper leaves;
fig. 4a is a schematic structural diagram of a check valve according to another embodiment of the present invention;
fig. 4b is a schematic structural diagram of a check valve according to another embodiment of the present invention;
fig. 5 is a schematic structural view of a check valve according to another embodiment of the present invention;
fig. 6 is a schematic structural view of a check valve according to another embodiment of the present invention;
FIG. 7 is a side view of the check valve shown in FIG. 6;
fig. 8 is a schematic structural view of a check valve according to another embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of the structure of section A of FIG. 8;
fig. 10 is a schematic structural block diagram of the operating principle of the range hood according to the embodiment;
FIG. 11 is a schematic diagram of an oscillator circuit module;
fig. 12 is a waveform diagram of the voltage value Uc across the variable capacitor in the oscillating circuit module and the output voltage Uo of the oscillating circuit module over time.
Wherein the relationship between the reference numbers and the names of the components in fig. 1-12 is:
the structure comprises pins 1-8, a check valve 9, a valve leaf 10, a positive conductive electrode plate 11, a negative conductive electrode plate 12, a positive outgoing wire 13, a negative outgoing wire 14, a rotating shaft 15, a glue overflow hole 16, a clamping groove 17, a positioning column 18 and a buckle 19.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1, the utility model provides a pair of range hood, including setting up the check valve 9 in air outlet department, be provided with two valve leaves 10 of rotatable switching on the check valve 9, two valve leaves 10 rotate the switching that can realize two valve leaves 10, and then realize opening and closing of check valve 9. The opposite surfaces of the two valve leaves 10 of the check valve 9 are respectively provided with a positive conductive pole plate 11 and a negative conductive pole plate 12, the positive and negative conductive pole plates 11 and 12 are set to be the same in shape and size and are symmetrically and oppositely arranged on the two valve leaves 10 of the check valve 9, and the two symmetrically arranged positive and negative conductive pole plates 11 and 12 form a variable capacitor structure.
The range hood further comprises a check valve detection device, and the check valve detection device can judge the opening and closing of the check valve 9 according to the change of the capacitance value of the variable capacitor.
After the range hood is started, when the two valve vanes 10 on the check valve 9 rotate to open and close, the positive and negative conductive electrode plates 11 and 12 are driven to rotate synchronously, so that the relative effective area between the positive conductive electrode plate 11 and the negative conductive electrode plate 12 on the opposite surfaces of the two valve vanes 10 is changed, and the capacitance value of a variable capacitor formed by the positive and negative conductive electrode plates 11 and 12 on the two valve vanes 10 is changed; the check valve detection device can judge whether the check valve 9 of the range hood is normally opened or normally closed under the condition of normal work according to different capacitance values, so that the real-time intelligent detection of the state of the check valve 9 is realized.
Specifically, according to a capacitance value theoretical calculation formula:
c = ε S/4 π kd (equation 1)
Wherein epsilon is the dielectric constant between the positive and negative conductive polar plates, d is the relative distance between the positive and negative conductive polar plates, and S is the area of the positive and negative conductive polar plates.
As can be seen from the above formula, the capacitance value of the variable capacitor is proportional to the area of the positive and negative conductive plates 11 and 12 when other parameters are constant. Here, the areas of the positive and negative conductive plates 11 and 12 refer to effective areas where they are opposed to each other. Due to the existence of the positive and negative conductive plates 3 and 5 symmetrically arranged on the two valve leaves 10 of the check valve 9, when the check valve 9 is fully opened (as shown in fig. 2 a), the two valve leaves 10 are completely opposite, that is, the positive and negative conductive plates 11 and 12 on the two valve leaves 10 are completely opposite, at this time, the effective area of the opposite between the positive and negative conductive plates 11 and 12 of the variable capacitor is the largest, and the capacitance value is the largest; when the check valve 9 is completely closed (as shown in fig. 2 b), the two valve leaves 10 are completely separated, that is, the positive and negative conductive plates 11 and 12 on the two valve leaves 10 are completely separated, and the effective area of the positive and negative conductive plates 11 and 12 of the variable capacitor is zero, and the capacitance is minimum. The check valve detection device can judge whether the check valve 9 is in an open state or a closed state according to different capacitance values.
Further, a rotating shaft 15 is provided at an adjacent end of the two valve blades 10, and the two valve blades 10 are fixed to the check valve 9 by the rotating shaft 15 and can be rotatably opened and closed with respect to the rotating shaft 15. Meanwhile, the positive conductive plate 11 and the negative conductive plate 12 are also arranged at positions close to the rotating shaft 15, the positive lead-out wire 13 on the positive conductive plate 11 is led out from one side of the check valve 9 along the rotating shaft 15 and is connected with a capacitance interface of the check valve detection device, the negative lead-out wire 14 of the negative conductive plate 12 is led out from one side of the check valve 9 along the rotating shaft 15 and is connected with a variable capacitance interface of the check valve detection device, and the positive conductive plate 11, the negative conductive plate 12 and the check valve detection device are connected through the positive lead-out wire 13 and the negative lead-out wire 14 to form a closed circuit loop. When the power is switched on, the variable capacitor can be charged and discharged, the check valve detection device judges the opening and closing state of the check valve 9 according to the changed capacitance value, and the intelligent check valve 9 detection system based on the capacitance sensing technology is realized.
Combining the capacitance sensing theory and the schematic diagram (fig. 3) of the movement process of the check valve 9, it can be seen that, during the movement of the valve vane 10, the relative effective area S1 of the positive and negative conductive plates 11 and 12 can be expressed as the angle (hereinafter referred to as β) between the two valve vanes 10 and the perpendicular bisector is changed under the condition that the relative area S0 of the positive and negative conductive plates 11 and 12 is kept constant:
s1= S0 cos β (formula 2)
In the example shown in fig. 3, the positive and negative conductive plates 11 and 12 are rectangular plates, and S0 is the product of the length L and the width W, so S1= L × W × cos β.
The angle β changes as the check valve 9 opens or closes, and the relative effective area S1 of the positive and negative conductive plates 11 and 12 changes, specifically, as shown in fig. 3, the angle β between the two valve leaves 10 and the center vertical line is 0 ° when the check valve 9 opens, and the relative effective area of the positive and negative conductive plates 11 and 12 is the largest, and the angle β between the two valve leaves 10 and the center vertical line is 90 ° when the check valve 9 closes, and the relative effective area of the positive and negative conductive plates 11 and 12 is the smallest.
When the valve leaf 10 rotates to drive the positive and negative conductive electrode plates 11 and 12 to rotate, the check valve detection device can judge whether the check valve 9 of the range hood is normally opened or closed under the condition of normal operation according to the capacitance value.
Specifically, as shown in FIG. 3, β increases during the closing of the check valve 9, resulting in a decrease in the effective area of the opposing surfaces between the positive and negative conductive plates 11 and 12 on the two vanes 10, and a decrease in the capacitance value of the variable capacitor formed by the positive and negative conductive plates 3, which is the smallest when the check valve 9 is fully closed. β decreases during the opening of the check valve 9, resulting in an increase in the effective area of the opposing surfaces between the positive and negative conductive plates 11 and 12 on the two vanes 10, and an increase in the capacitance value of the variable capacitor, which is the largest when the check valve 9 is fully open.
The sum S of the areas of the opposing surfaces of the positive and negative conductive plates 11 and 12 on the two vanes 10 of the check valve 9 was testedJBIt is necessary to control the sum S of the areas of the facing surfaces of the two vanes 10 (the facing surfaces on which the positive and negative conductive plates 11 and 12 are mounted) to be 10% or more, that is, SJBThe sensitivity requirement of the check valve detection device can be met only when the detection time is more than or equal to 10% multiplied by S. Because, if the positive and negative conductive electrodes are usedSum S of areas of the opposing surfaces of the plates 11 and 12JBIf the capacitance value of the variable capacitor changes too little when the valve vane rotates, the capacitance value of the variable capacitor may not be detected accurately enough by the check valve detection device, so that the sensitivity requirement of the check valve detection device cannot be met, the sensitivity of system measurement cannot be guaranteed, and the opening and closing conditions of the check valve 9 cannot be accurately known.
The shape of the positive and negative conductive plates 11 and 12 on the valve leaf 10 of the check valve 9 has an influence on the detection sensitivity of the check valve detection device, and the positive and negative conductive plates 11 and 12 may be designed in a rectangular shape, a semicircular shape or an elliptical shape according to the detection sensitivity of the check valve detection device, and further, the positive and negative conductive plates 11 and 12 may be configured to have the same shape and size and be symmetrically and oppositely installed on the two valve leaves 10 of the check valve 9.
When the positive and negative conductive plates 11 and 12 are designed to be rectangular, as shown in fig. 1, the design is convenient for cutting and installation, and in order to prevent the corners from raising, the corners of the rectangle can be designed to be rounded, as shown in fig. 4 a; when the positive and negative conductive plates 11 and 12 are designed to be arc-shaped, the corners of the positive and negative conductive plates 11 and 12 can be effectively prevented from being raised, so that the installation is more reliable, optionally, the positive and negative conductive plates 11 and 12 can be designed to be semi-elliptical, as shown in fig. 4b, or the positive and negative conductive plates 11 and 12 can be designed to be semi-circular; of course, the positive and negative conductive plates 11 and 12 may be designed into any other shapes, which will not be described herein.
The positive and negative conductive plates 11 and 12 on the valve leaf 1 have the characteristic requirement that the requirement can be met as long as the conductive characteristic is met, no special requirement is required for specific materials, and the positive and negative conductive plates 11 and 12 in the embodiment can be designed to be copper plates, aluminum plates, iron plates or aluminum foils.
Alternatively, when copper-based plates are used as the positive and negative conductive plates 11 and 12 fixed on the valve leaf 10, the conductivity of copper is good, the sensitivity of the check valve detecting device is high, but the price of copper is expensive.
Optionally, when the positive and negative conductive plates 11 and 12 made of aluminum are fixed on the valve vane 10, the conductive performance of aluminum is good, the sensitivity of the check valve detection device is high, and the price of aluminum is moderate.
Alternatively, when iron plates are used as the positive and negative conductive plates 11 and 12 fixed on the valve leaf 10, the conductivity of iron is moderate, the sensitivity of the check valve detection device is moderate, and the price of iron is low; alternatively, the entire valve leaf 10 may be made of iron, and the valve leaf 10 may also function as an electrode.
Alternatively, when aluminum foil paper is used as the positive and negative conductive electrode plates 11 and 12 to be adhered on the valve leaf 10, the conductivity of the aluminum foil is general, the sensitivity of the check valve detection device is general, and the price of the aluminum foil is low; but is not easy to install and is easy to break.
Of course, the positive and negative conductive electrode plates 11 and 12 in the present invention can be designed to other kinds of materials as long as the conductive characteristics of the positive and negative conductive electrode plates 11 and 12 are satisfied, and the description is omitted here.
In this embodiment, optionally, the positive conductive electrode plate 11 and the negative conductive electrode plate 12 may be fixed to the corresponding valve leaf 10 by gluing, that is, the conductive metal electrode plate is directly fixed to the valve leaf 10 by gluing, and then led out along the rotating shaft 15 through the positive and negative electrode lead-out wires 13 and 14; the gluing mode can adopt strong glue and the like for pasting, and can also adopt other glue, thereby enhancing the installation firmness of the positive conductive pole plate 11 and the negative conductive pole plate 12 on the valve leaf 10; as shown in fig. 5, in order to improve the operability and the firmness during gluing, glue overflow holes 16 (only part of the glue overflow holes 16 are shown in fig. 5) are respectively formed on the positive and negative conductive electrode plates 11 and 12, so as to improve the glue overflow uniformity and ensure the firmness of gluing.
Alternatively, the positive conductive plate 11 and the negative conductive plate 12 may be fixed to their corresponding valve vanes 10 by means of clamping. In an alternative embodiment, as shown in fig. 6 and 7, a locking groove 17 and a positioning column 18 are provided on the valve leaf 10. During installation, the positive conductive pole plate 11 and the negative conductive pole plate 12 are respectively installed in the clamping groove 17, and the positions of the positive conductive pole plate 11 and the negative conductive pole plate 12 are limited through the positioning column 18, so that the positive conductive pole plate 11 and the negative conductive pole plate 12 are firmly clamped in the positioning structure limited by the clamping groove and the positioning column, and the pole plates are prevented from loosening. In another alternative embodiment, as shown in fig. 8 and 9, a catch 17 and a catch 19 are provided on the valve flap 10. During installation, the positive conductive pole plate 11 and the negative conductive pole plate 12 are installed in the clamping groove 17 respectively, and the positions of the positive conductive pole plate 11 and the negative conductive pole plate 12 are limited and fixed through the buckle 19, so that the positive conductive pole plate 11 and the negative conductive pole plate 12 are firmly clamped in the clamping groove, and the pole plates are prevented from loosening.
Optionally, conductive layers may be coated on the surfaces of the two valve leaves 10 to serve as the positive conductive electrode plate 11 and the negative conductive electrode plate 12, and then the positive and negative lead wires 4 and 6 are connected with the conductive layers by means of glue, and meanwhile, the surfaces of the conductive layers may be painted, so as to prevent the conductive layers from being scratched, and further increase the reliability of the positive and negative conductive electrode plates 11 and 12.
Optionally, the two valve leaves 10 may also be directly made of a metal material, so that the two valve leaves 10 are respectively used as the positive conductive pole plate 11 and the negative conductive pole plate 12, which may reduce the complexity of the structure and reduce the manufacturing processes, and the whole valve leaf 10 is used as the positive and negative conductive pole plate, which is beneficial to increase the relative effective area between the positive and negative conductive pole plates 11 and 12, and further improve the detection sensitivity of the check valve detection device.
The influence of the thickness of the positive and negative conductive electrode plates on the detection sensitivity is small and can be ignored, so that no requirement is imposed on the thickness of the positive and negative conductive electrode plates, and the scheme with the lowest cost can be selected based on the difference of the cost and the processing technology.
Furthermore, because the check valve 9 is disposed at the air outlet, and two semicircular valve leaves 10 capable of being opened and closed by rotation are horizontally disposed on the check valve, when the range hood is started, the fan starts to form air pressure at the air outlet, so that the two valve leaves 10 rotate along the rotating shaft 15 to be opened, and after the fan is closed, the valve leaves 10 are naturally closed due to self gravity. The valve leaf 10 can be assembled and disassembled independently.
Alternatively, the rotation of the two valve leaves 10 on the check valve 9 can be controlled by the motor drive. The two valve leaves 10 with the same shape are also adopted on the check valve 9 and are rotatably connected on the valve body through a rotating shaft 15, the rotating shaft 15 is connected with an output shaft of a motor through a transmission mechanism (such as a gear transmission mechanism), the motor is adopted to drive the valve leaves 10 to act, and the motor device is added to drive the two valve leaves 10 of the check valve 9 to rotate to open and close, so that the automatic control of the opening and closing of the check valve 9 is favorably realized.
Optionally, the check valve detection device comprises an oscillation circuit module and a control unit module. The range hood in this embodiment detects the opening and closing of the check valve through the variable capacitor, the oscillation circuit module and the control unit module on the check valve, as shown in fig. 10.
The positive and negative conductive plates 11 and 12 on the two valve leaves 10 of the check valve 9 form a variable capacitor, and the relative effective area between the positive and negative conductive plates 11 and 12 is changed by the rotation of the valve leaves 10, so that the capacitance value of the variable capacitor is changed.
The oscillation circuit module can output rectangular waves with certain frequency at the output end according to the capacitance value of the variable capacitor. When the capacitance value of the variable capacitor C changes, the frequency of the rectangular wave output by the output end of the oscillation circuit module is correspondingly changed.
The control unit module may determine the current state of the check valve 9 by detecting the magnitude of the frequency f of the rectangular wave output by the oscillation circuit module.
In the specific example shown in fig. 11, the oscillation circuit module includes a time base oscillation chip, a first resistor (denoted by RA), a second resistor (denoted by RB) and an interference prevention capacitor (denoted by C1), and the time base oscillation chip has 8 pins. Wherein, the time base vibrates pin 8 of chip, pin 4 and the first end of first resistance RA are connected to the power VCC, the second end of first resistance RA links to each other with the first end of second resistance RB, the second end of second resistance RB links to each other with variable capacitance C's positive conducting plate 11, negative conducting plate 12 ground connection, pin 7 of chip is vibrated to the time base is connected between first resistance RA and second resistance RB, pin 2 and pin 6 are connected between second resistance RB and variable capacitance C's positive conducting plate 11, pin 1 ground connection of chip is vibrated to the time base, ground connection behind pin 5 series connection jam-proof capacitance C1, pin 3 is the output.
As can be seen from the schematic diagram of the oscillator circuit block (fig. 11), RA, RB and C form an RC charging/discharging circuit, the reference voltage (2/3 VCC) of the internal comparator a1 is applied to the non-inverting input terminal, and the reference voltage (1/3 VCC) of the internal comparator a2 is applied to the inverting input terminal. Wherein RA, RB and C1 are external elements, and C is a variable capacitor (corresponding to the variable capacitor of the present invention, which is composed of positive and negative conductive plates 11 and 12 on two valve leaves 10 of the check valve 9).
When the power supply VCC is switched on, the pin 3 of the time base oscillation chip outputs high level, and simultaneously the power supply VCC charges the capacitor C through RA and RB, when the voltage on the capacitor C reaches the threshold voltage (2/3 VCC) of the pin 6 of the time base oscillation chip, the pin 7 of the time base oscillation chip discharges the electricity in the capacitor C, and at the moment, the voltage output by the pin 3 is changed from high level to low level. When the voltage of the capacitor C drops to (1/3 VCC), the pin 3 outputs a high level again, and the power source VCC charges the capacitor C through RA, RB again. This is repeated to form an oscillating square wave output. In the process of charging and discharging the capacitor C, the change of the voltage Uc on the capacitor C with time t and the change of the voltage Uout output by the output terminal (pin 3) of the time-base oscillation chip with time t are specifically shown in fig. 12.
As can be seen from the above analysis, the schematic diagram of the oscillation circuit module of fig. 11, and fig. 12, the oscillation period T includes a capacitor charging time T1 and a capacitor discharging time T2, T = T1+ T2:
wherein the charging time is:
t1= (RA + RB) × C × (RA + RB) × ln2 ≈ 0.69 ≈ C (formula 3)
Discharging time:
t2= RB C ln2 ≈ 0.69 RB C (formula 4)
Therefore, the oscillation period of the output rectangular wave is:
t = T1+ T2=0.69 (RA +2 RB) C (formula 5)
And frequency f =1/T (equation 6)
In this embodiment, the values of RA, RB and C1 are constant, and therefore, only the change in the capacitance value of the variable capacitor C affects the frequency f of the rectangular wave output by the oscillation circuit module. When the capacitance value of the variable capacitor C changes, the frequency f of the rectangular wave output by the oscillation circuit module changes, and the control unit module determines that the check valve 9 is currently in the open or closed state according to the frequency f of the rectangular wave.
From the equations 1 to 6, the frequency f output by the oscillating circuit module is proportional to the included angle β, that is, as the included angle β between the two valve vanes 10 and the perpendicular bisector decreases, the valve vane 10 of the check valve 9 is in an open state, the capacitance value of the variable capacitor C formed by the positive and negative conductive plates 11 and 12 increases, but the pulse frequency f output by the oscillating circuit module decreases.
Furthermore, the check valve detection device also comprises an alarm module, when the check valve 9 is opened or closed abnormally, the alarm module automatically gives an alarm to inform a user of timely maintaining, and the working stability of the check valve detection device is ensured.
With reference to fig. 1 to 12 of the drawings, the specific working principle of the range hood provided in this embodiment is as follows:
after the range hood is started, the two valve blades 10 can be rotatably opened and closed under the action of wind power or the rotation driven by a motor of the check valve 9 at the air outlet.
When the two valve leaves 10 rotate to open, as shown in fig. 2a, the included angle β is approximately 0 degree, the two valve leaves 10 are parallel and opposite, and correspondingly, the positive and negative conductive plates 11 and 12 are also kept parallel and opposite, at this time, the effective area of the opposite surfaces of the positive and negative conductive plates 11 and 12 is the largest, that is, the capacitance value of the variable capacitor formed by the positive and negative conductive plates 11 and 12 reaches the largest, the oscillating circuit module outputs rectangular waves (with the smallest frequency) of corresponding frequencies according to the capacitance value (with the largest capacitance value) of the variable capacitor, and then the control unit module judges that the check valve 9 is currently in a normal open state according to the frequency value at the output end of the oscillating circuit module;
when the two valve vanes 10 are turned to close, as shown in fig. 2b, the included angle β is approximately 90 degrees, the effective area of the opposite surfaces of the positive and negative conductive plates 11 and 12 is approximately zero, that is, the capacitance value of the variable capacitor C is approximately zero, the period of the rectangular wave output by the output end of the oscillating circuit can be regarded as infinitesimal, the frequency can be regarded as infinity, and the control unit module determines that the check valve 9 is currently in a completely closed state according to the linear signal;
in the process of the rotation opening of the two valve vanes 10, namely β is gradually reduced, the effective area of the opposite surface between the positive and negative conductive pole plates 11 and 12 is increased, and further the capacitance value of the variable capacitor is increased, at the moment, the frequency of the rectangular wave output by the output end of the oscillation circuit module is gradually reduced, on the contrary, in the process of the rotation closing of the two valve vanes 10, namely β is gradually increased, the effective area of the opposite surface between the positive and negative conductive pole plates 11 and 12 is reduced, the capacitance value of the variable capacitor is reduced, and the frequency of the rectangular wave output by the output end of the oscillation circuit module is gradually increased.
When the check valve 9 is opened or closed abnormally, the alarm module gives an alarm automatically to inform a user of timely maintenance.
The embodiment of the invention has the following advantages:
1. the positive and negative conductive electrode plates are arranged on the two valve leaves of the check valve to form a variable capacitor, and the current state of the check valve is accurately detected and judged in real time by designing an intelligent check valve detection system based on the variable capacitor, so that the problems of non-closed loop and non-intelligent detection of the check valve are solved;
2. by designing an oscillation circuit module, the frequency change of the output waveform is caused by the change of the variable capacitor, the state of the check valve is judged in real time by detecting the change of the frequency of the output waveform, and the real-time performance and the accuracy are high;
3. the positive and negative conductive polar plates arranged on the two valve leaves of the check valve can be used as long as the materials with conductive characteristics can be used, so that the material cost can be greatly reduced;
4. on the basis of detecting the state of the check valve in real time, whether the check valve is opened or closed abnormally is further judged, if abnormal, an alarm is automatically given, and a user is reminded to clean and report for repair.
It should be noted that, the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above embodiments are only specific and detailed descriptions of several embodiments of the present invention, but the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A range hood comprises a check valve arranged at an air outlet and is characterized in that,
the check valve comprises two valve leaves which can be opened and closed in a rotating mode, and a positive conductive polar plate and a negative conductive polar plate which are arranged on the opposite surfaces of the two valve leaves, wherein the positive conductive polar plate and the negative conductive polar plate form a variable capacitor;
the range hood further comprises a check valve detection device, and the check valve detection device can judge the opening and closing of the check valve according to the change of the capacitance value of the variable capacitor.
2. The range hood of claim 1,
and a rotating shaft is arranged at one end adjacent to the two valve blades, the positive conductive polar plate and the negative conductive polar plate are close to the rotating shaft, a positive lead-out wire of the positive conductive polar plate is led out from one side of the check valve along the rotating shaft and is connected with the check valve detection device, and a negative lead-out wire of the negative conductive polar plate is led out from one side of the check valve along the rotating shaft and is connected with the check valve detection device.
3. The range hood of claim 1,
the sum S of the areas of the opposing surfaces of the positive and negative conductive platesJBThe relation S between the sum of the areas of the opposite surfaces of the two valve blades, which are provided with the positive conductive polar plate and the negative conductive polar plate, is as follows: sJB≥10%×S。
4. The range hood of any one of claims 1-3,
the positive conductive polar plate is rectangular, semicircular or semi-elliptical;
or, the negative conductive polar plate is rectangular, semicircular or semi-elliptical.
5. The range hood of any one of claims 1-3,
the positive conductive polar plate is a copper plate, an aluminum plate, an iron plate or an aluminum foil;
or the negative conductive polar plate is a copper plate, an aluminum plate, an iron plate or an aluminum foil.
6. The range hood of any one of claims 1-3,
the positive conductive polar plate and the negative conductive polar plate are respectively fixed with the corresponding valve leaves through gluing or clamping;
or the positive conductive polar plate and the negative conductive polar plate are conductive layers coated on the two valve blades;
or, the two valve leaves are made of metal materials and are respectively used as the positive conductive pole plate and the negative conductive pole plate.
7. The range hood of any one of claims 1-3,
the two valve blades are horizontally arranged, can be rotated and opened under the action of wind power and can be rotated and closed under the action of self gravity;
or the two valve blades are driven to rotate by a motor respectively.
8. The range hood of any one of claims 1-3,
the check valve detection device comprises an oscillation circuit module and a control unit module, wherein the oscillation circuit outputs rectangular waves with certain frequency according to the capacitance value of the variable capacitor, and the control unit module judges the current state of the check valve according to the frequency of the rectangular waves output by the oscillation circuit module.
9. The range hood of claim 8,
the oscillation circuit module includes: the circuit comprises a time base oscillation chip, a first resistor, a second resistor and an anti-interference capacitor, wherein the time base oscillation chip is provided with 8 pins; wherein,
the time base oscillation chip comprises a pin 8, a pin 4 and a first end of a first resistor, wherein the pin 8 and the pin 4 are connected to a power supply, the second end of the first resistor is connected with the first end of a second resistor, the second end of the second resistor is connected with a positive conductive plate, a negative conductive plate is grounded, a pin 7 of the time base oscillation chip is connected between the first resistor and the second resistor, a pin 2 and a pin 6 are connected between the second resistor and the positive conductive plate, a pin 1 of the time base oscillation chip is grounded, a pin 5 is connected in series with a back ground of an anti-interference capacitor, and a pin 3 is an output end.
10. The range hood of any one of claims 1-3,
the check valve detecting device further includes: and the alarm module automatically alarms when the check valve is opened or closed abnormally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696260.2U CN207648895U (en) | 2017-12-08 | 2017-12-08 | A kind of range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696260.2U CN207648895U (en) | 2017-12-08 | 2017-12-08 | A kind of range hood |
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| CN207648895U true CN207648895U (en) | 2018-07-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848453A (en) * | 2019-10-11 | 2020-02-28 | 宁波方太厨具有限公司 | State monitoring method for check valve |
| CN113217962A (en) * | 2021-05-24 | 2021-08-06 | 梁启明 | Range hood based on fluid pressure adsorption type |
| CN115143496A (en) * | 2021-03-31 | 2022-10-04 | 芜湖美的厨卫电器制造有限公司 | Condensation plate opening and closing mechanism and range hood |
-
2017
- 2017-12-08 CN CN201721696260.2U patent/CN207648895U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848453A (en) * | 2019-10-11 | 2020-02-28 | 宁波方太厨具有限公司 | State monitoring method for check valve |
| CN110848453B (en) * | 2019-10-11 | 2021-05-18 | 宁波方太厨具有限公司 | State monitoring method for check valve |
| CN115143496A (en) * | 2021-03-31 | 2022-10-04 | 芜湖美的厨卫电器制造有限公司 | Condensation plate opening and closing mechanism and range hood |
| CN113217962A (en) * | 2021-05-24 | 2021-08-06 | 梁启明 | Range hood based on fluid pressure adsorption type |
| CN113217962B (en) * | 2021-05-24 | 2024-04-02 | 华霸智能科技(广东)有限公司 | Range hood based on fluid pressure adsorption type |
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Effective date of registration: 20230526 Address after: Building 2, No. 52, 22nd Street, Baiyang Street, Qiantang New District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Hangzhou Jiuchuang Home Appliances Co.,Ltd. Address before: No. 999, Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee before: JOYOUNG Co.,Ltd. |
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