A ventilation device control circuit, ventilation device and air curtain machine

Abstract

The utility model discloses a kind of ventilation equipment control circuit, ventilation equipment and air curtain machine, by setting normally closed second switch and normally open third switch in ventilation equipment, second switch is automatically disconnected when temperature is greater than first temperature, to control the first end and second end of fourth switch disconnect to disconnect the connection of heating body and power supply, to control heating body to stop heating when temperature is too high, guarantee the safety of ventilation equipment operation;Third switch is automatically closed when temperature is greater than second temperature, to ensure that motor can send hot air in time, avoid the problem that the temperature of the wind that ventilation equipment just starts hot air function blows is lower, improve the use experience of user.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment, and in particular to a ventilation equipment control circuit, ventilation equipment and air curtain machine. Background Technology

[0002] Ventilation equipment can be used to blow out cold and hot air. When the weather is cold, blowing out hot air through ventilation equipment can improve indoor temperature and comfort.

[0003] However, existing ventilation equipment blows out air at a low temperature when the hot air function is first activated. After blowing out cold air for a period of time, the temperature gradually rises and then blows out hot air, which affects the user experience. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the prior art and provide a ventilation equipment control circuit, ventilation equipment and air curtain machine, which can enable the ventilation equipment to deliver hot air after activating the hot air function and realize the overheat protection of the ventilation equipment, thereby improving the safety and user experience.

[0005] In a first aspect, this utility model provides a ventilation equipment control circuit, applied to a ventilation equipment, the ventilation equipment including a heating element and a motor, the circuit including a first switch, a second switch, a third switch and a fourth switch; wherein, the second switch is a normally closed temperature control switch that opens when the temperature is greater than a first temperature; the third switch is a normally open temperature control switch that closes when the temperature is greater than a second temperature; the first temperature is greater than the second temperature;

[0006] The common terminal of the first switch is connected to the power supply and the first terminal of the third switch. The first terminal of the first switch is connected to the second terminal of the second switch. The first terminal of the second switch is connected to the control terminal of the fourth switch. The first terminal of the fourth switch is connected to the power supply. The second terminal of the fourth switch is connected to the heating element. The second terminal of the first switch is connected to the motor and the second terminal of the third switch.

[0007] Secondly, this utility model provides a ventilation device, including a heating element, a motor, and a ventilation device control circuit as described in any of the above.

[0008] Thirdly, this utility model provides an air curtain machine, including a heating element, a motor, and a ventilation equipment control circuit as described in any of the above.

[0009] In this embodiment, by setting a normally closed second switch and a normally open third switch in the ventilation equipment, the second switch automatically opens when the temperature exceeds the first temperature, thereby controlling the first and second ends of the fourth switch to disconnect the heating element from the power supply. This ensures that the heating element stops heating when the temperature is too high, guaranteeing the safety of the ventilation equipment operation. The third switch automatically closes when the temperature exceeds the second temperature, ensuring that the motor can deliver hot air in a timely manner, avoiding the problem of low air temperature when the ventilation equipment first starts the hot air function, and improving the user experience.

[0010] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the ventilation equipment control circuit in one embodiment of the present invention;

[0012] Figure 2 This is a circuit diagram of the ventilation equipment control circuit in one embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the ventilation equipment in one embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of the structure of an air curtain machine in one embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0016] It should be understood that the described embodiments are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0018] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] Furthermore, in the description of this application, unless otherwise stated, "several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0020] like Figure 1 As shown, this utility model provides a control circuit for a ventilation device, which can be used to output hot or cold air. The ventilation device can be an air curtain or similar equipment. The ventilation device includes a heating element and a motor. The heating element is used to heat the air and can be a common heating device such as a PTC heating element. The motor can drive the fan blades and other air delivery components of the ventilation device to rotate, thereby outputting cold or hot air to the outside.

[0021] Ventilation equipment delivers hot air to the outside by controlling the heating element and the operation of the motor, or it can deliver cold air to the outside by controlling the operation of the motor.

[0022] The circuit includes a first switch 110, a second switch 120, a third switch 130, and a fourth switch 140; the first switch 110, the second switch 120, the third switch 130, and the fourth switch 140 are disposed inside the ventilation equipment.

[0023] The common terminal of the first switch 110 is connected to the power supply and the first terminal of the third switch 130, the first terminal of the first switch 110 is connected to the second terminal of the second switch 120, the first terminal of the second switch 120 is connected to the control terminal of the fourth switch 140, the first terminal of the fourth switch 140 is connected to the power supply, the second terminal of the fourth switch 140 is connected to the heating element, and the second terminal of the first switch 110 is connected to the motor and the second terminal of the third switch 130.

[0024] The first switch 110 can selectively connect the common terminal and the first terminal according to the user's operation or the received instruction, or it can control the common terminal and the second terminal to connect, thereby outputting hot air or cold air.

[0025] Optionally, when the common terminal and the first terminal of the first switch 110 are connected, the heating element and the motor work to deliver heated hot air; when the common terminal and the second terminal of the first switch 110 are connected, the motor works to deliver unheated cold air.

[0026] In this embodiment, the first switch 110 can be a rocker switch. By tossing the rocker switch to different positions, the common terminal of the first switch 110 can be connected to either the first terminal or the second terminal.

[0027] The second switch 120 is a normally closed temperature control switch, which opens when the temperature is higher than the first temperature.

[0028] The third switch 130 is a normally open temperature control switch, which closes when the temperature is higher than the second temperature.

[0029] Normally closed and normally open temperature control switches are metal strip temperature controllers with temperature threshold detection. They can sense the ambient temperature and open or close when the ambient temperature reaches the set temperature threshold. Compared with the traditional method of detecting temperature by a temperature sensor and then making a judgment and issuing a corresponding indication based on the detected temperature, the mechanical opening and closing of the switch provides greater stability and higher safety.

[0030] The first temperature is higher than the second temperature. Both the first and second temperatures can be set according to the actual application. When the temperature exceeds the first temperature, it indicates that the current temperature is too high. When the temperature exceeds the second temperature, it indicates that the current temperature is the ideal temperature for the hot air delivered by the ventilation equipment. The ideal temperature can be determined based on the hot air temperature of the ventilation equipment.

[0031] The second switch 120 and the third switch 130 are disposed on the air supply channel of the ventilation equipment; for example, the second switch 120 and the third switch 130 can be disposed near the heating element, such as at the air inlet near the heating element, so as to control the on / off state according to the change of ambient temperature at the air inlet near the heating element.

[0032] The fourth switch 140 is used to turn on or off the circuit between the power supply and the heating element according to the signal from the control terminal, thereby controlling the heating element to heat up or stop heating.

[0033] Specifically, when the common terminal and the first terminal of the first switch 110 are connected, the second switch 120 is closed, and the first and second terminals of the fourth switch 140 are connected, powering the heating element and starting heating. The third switch 130 is open. When the heating element heats up and the ambient temperature exceeds the second temperature, the third switch 130 closes, and the motor is powered on to deliver hot air. When the ventilation equipment experiences abnormal conditions such as poor air intake, motor malfunction, or impeller malfunction leading to no or little airflow, the temperature around the heating element rises abnormally. When the temperature exceeds the first temperature, the second switch 120 opens, and the fourth switch 140 opens accordingly, thus disconnecting the circuit between the power supply and the heating element, controlling the heating element to stop heating, and preventing overheating of the heating element that could cause safety hazards. This overheat protection of the heating element improves the operational safety of the ventilation equipment. When the heating element stops heating, the third switch 130 remains closed due to the high temperature, and the motor continues to deliver hot air until the temperature drops below the second temperature. Only then will the third switch 130 open, the motor stop blowing air, reduce the internal temperature of the ventilation equipment, and prevent the ventilation equipment from aging too quickly due to high temperatures.

[0034] In the above embodiment, the third switch 130 closes to supply air when the internal ambient temperature of the ventilation equipment is higher than the second temperature, which can reduce the internal ambient temperature of the ventilation equipment and prevent the heating element from burning dry, thus avoiding safety hazards.

[0035] In this embodiment, by setting a normally closed second switch and a normally open third switch in the ventilation equipment, the second switch automatically opens when the temperature exceeds the first temperature, thereby controlling the first and second ends of the fourth switch to disconnect the heating element from the power supply. This ensures that the heating element stops heating when the temperature is too high, guaranteeing the safety of the ventilation equipment operation. The third switch automatically closes when the temperature exceeds the second temperature, ensuring that the motor can deliver hot air in a timely manner, avoiding the problem of low air temperature when the ventilation equipment first starts the hot air function, and improving the user experience.

[0036] like Figure 2 As shown, the ventilation equipment control circuit includes a first switch SW, a second switch RT1, a third switch RT5, and a fourth switch K.

[0037] In one embodiment, the fourth switch K is a contactor; the first end of the contactor's coil is connected to a power source, the second end of the contactor's coil is connected to the first switch, and the contactor's contacts are used to connect the heating element and the power source.

[0038] A contactor is an electromagnetic switch that generates a magnetic field by energizing a coil, which attracts an armature to close or open the contacts. Compared with other switching elements, contactors can withstand higher voltage and current and can be applied to high-power loads. In this embodiment, a contactor is used as a fourth switch to control the path between the heating element and the power supply, thereby improving the reliability of the circuit.

[0039] In one embodiment, the ventilation device includes at least two heating elements, and the contactor includes at least two pairs of contacts corresponding to the at least two heating elements, with one pair of contacts used to connect a heating element to a power source.

[0040] like Figure 2 As shown in the embodiment of this application, the power supply is a 380V AC power supply, which includes three live wires L1, L2, L3 and a neutral wire N. The ventilation equipment includes three PTC heating elements. The contactor includes three pairs of contacts, each pair of contacts being connected to a PTC heating element and a live wire, respectively.

[0041] In this embodiment, a contactor with multiple contacts is used to control multiple heating elements to heat the air, thereby improving the heating speed and efficiency of the heating elements, which in turn increases the speed at which the ventilation equipment blows out hot air and improves the user experience.

[0042] like Figure 2 As shown, in one embodiment, a first indicator LED1 is also included, with a first end of the first indicator LED1 connected to the second end of the fourth switch K, and the second end of the first indicator LED1 connected to a power supply.

[0043] The first indicator LED1 is used to indicate the operating status of the heating element. When the heating element is powered on and heating, the first indicator LED1 lights up. When the heating element is de-powered and stops heating, the first indicator LED1 turns off. Thus, the operating status of the heating element can be determined based on the status of the first indicator LED1, and whether the heating element is heating.

[0044] Specifically, in this embodiment of the application, the first end of the first indicator LED1 is connected to the second end of the coil of the fourth switch K, and the second end of the first indicator LED1 is connected to the neutral line N of the power supply through a resistor R1.

[0045] Resistor R1 can be used to limit the current flowing through the first indicator LED1, ensuring the safe operation of the first indicator LED1.

[0046] In this embodiment, a first indicator light that illuminates when the heating element is powered on is used to indicate the current operating status of the heating element, making it convenient for users to check the operating status and abnormalities of the heating element, thereby enabling timely maintenance and replacement of the heating element and improving the safety of ventilation equipment operation.

[0047] Optionally, the circuit may further include a normally closed temperature control switch RT2, which is disposed between the normally closed temperature control switch RT1 and the first terminal of the first switch SW. The normally closed temperature control switch RT2 is disconnected when the temperature is higher than a fourth temperature, which may be the same as or different from the first temperature.

[0048] When either normally closed temperature control switch RT1 or normally closed temperature control switch RT2 is disconnected, the contactor coil is de-energized, and the contactor contacts open, causing the heating element to lose power and stop heating. By setting two or more normally closed temperature control switches, the overheat protection of the heating element is prevented from failing due to the malfunction of a single temperature control switch, thus improving operational safety.

[0049] In one embodiment, the device further includes a fifth switch RT3 and a second indicator LED2. The first end of the fifth switch RT3 is connected to the first end of the first switch SW, and the second end of the fifth switch RT3 is connected to the first end of the second indicator LED2. The second end of the second indicator LED2 is connected to a power source.

[0050] In this embodiment, the second terminal of the second indicator LED2 can be connected to the neutral line N of the power supply via a resistor R1. This ensures the reliability of the second indicator LED2.

[0051] The fifth switch RT3 can be a normally open temperature control switch that closes when the temperature is higher than the third temperature. The third temperature can be the same as the first temperature, or it can be set to a different temperature than the first temperature, for example, it can be lower than the first temperature, depending on the requirements.

[0052] In this embodiment, the fifth switch RT3 is closed when the temperature is too high to illuminate the second indicator LED2. The second indicator LED2 indicates that the heating element is abnormal, which makes it convenient for users to understand that the heating of the ventilation equipment is abnormal and to carry out timely repair and replacement.

[0053] Optionally, a normally open temperature control switch RT4 connected in parallel with the fifth switch RT3 may also be included. When either the normally open temperature control switch RT3 or the normally open temperature control switch RT4 is turned on, the second indicator LED2 will be powered on and lit. This can avoid the problem of abnormal status indicated by the second indicator LED due to the malfunction of a single temperature control switch and improve operational reliability.

[0054] Preferably, the motor in this embodiment can also be connected in parallel with a starting capacitor. The starting capacitor can be a large-capacity (50-300μF) electrolytic capacitor or other commonly used starting capacitors. The starting capacitor can increase the additional phase difference when the motor starts, thereby ensuring that the motor can start smoothly.

[0055] The ventilation equipment control circuit of this application embodiment is simple, reliable, and low-cost. It does not require the use of a microcontroller, resulting in low production and modification costs for ventilation equipment and high economic benefits, thereby enhancing the market competitiveness of ventilation equipment.

[0056] like Figure 3 As shown, the present invention provides a ventilation device 200, including a heating element 210, a motor 220, and a ventilation device control circuit 230 as described in any of the above claims.

[0057] like Figure 4 As shown, this utility model provides an air curtain machine 300, including a heating element 310, a motor 320, and a ventilation equipment control circuit 330 as described in any of the above.

[0058] An air curtain machine is a device that uses a high-speed motor to drive a cross-flow or centrifugal fan to generate a powerful airflow and uses electric heating to heat the air, thereby forming an invisible curtain of hot airflow in areas such as doorways.

[0059] The air curtain machine described in this application has the characteristics of low production cost and high economic benefits, and has good market competitiveness.

[0060] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A control circuit for a ventilation device, characterized in that, The device is used in ventilation equipment, which includes a heating element and a motor. The circuit includes a first switch, a second switch, a third switch, and a fourth switch. The second switch is a normally closed temperature control switch that opens when the temperature is higher than a first temperature. The third switch is a normally open temperature control switch that closes when the temperature is higher than a second temperature. The first temperature is higher than the second temperature. The common terminal of the first switch is connected to the power supply and the first terminal of the third switch. The first terminal of the first switch is connected to the second terminal of the second switch. The first terminal of the second switch is connected to the control terminal of the fourth switch. The first terminal of the fourth switch is connected to the power supply. The second terminal of the fourth switch is connected to the heating element. The second terminal of the first switch is connected to the motor and the second terminal of the third switch.

2. The ventilation equipment control circuit according to claim 1, characterized in that, The fourth switch is a contactor; the first end of the contactor's coil is connected to the power supply, the second end of the contactor's coil is connected to the first switch, and the contactor's contacts are used to connect the heating element and the power supply.

3. The ventilation equipment control circuit according to claim 2, characterized in that, The ventilation device includes at least two heating elements, and the contactor includes at least two pairs of contacts corresponding to the at least two heating elements, with each pair of contacts used to connect a heating element to a power source.

4. The ventilation equipment control circuit according to claim 1, characterized in that, It also includes a first indicator light, the first end of which is connected to the second end of the fourth switch, and the second end of which is connected to a power source.

5. The ventilation equipment control circuit according to claim 1, characterized in that, It also includes a fifth switch and a second indicator light, wherein the fifth switch is a normally open temperature control switch that closes when the temperature is higher than the third temperature; The first end of the fifth switch is connected to the first end of the first switch, the second end of the fifth switch is connected to the first end of the second indicator light, and the second end of the second indicator light is connected to the power supply.

6. The ventilation equipment control circuit according to claim 1, characterized in that, The first switch is a rocker switch.

7. A ventilation device, characterized in that, It includes a heating element, a motor, and a ventilation equipment control circuit as described in any one of claims 1-6.

8. An air curtain machine, characterized in that, It includes a heating element, a motor, and a ventilation equipment control circuit as described in any one of claims 1-6.

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