CN115751564A

CN115751564A - Ventilation equipment with anti-freezing function

Info

Publication number: CN115751564A
Application number: CN202211322707.5A
Authority: CN
Inventors: 刘纪敏; 胡健; 王友伟; 莫雨辰
Original assignee: Vaillant Wuxi Heating Equipment Co Ltd
Current assignee: Vaillant Wuxi Heating Equipment Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-03-07

Abstract

The invention provides a ventilation device with an anti-freezing function, which comprises a shell, an air supply fan, an anti-freezing switch, a time delay switch and a controller. The case has an air supply inlet for the intake of outdoor air, an air supply outlet for the discharge of outdoor air into the room, and an air supply passage defined between the air supply inlet and the air supply outlet. The air supply fan is disposed in the air supply passage to drive an air flow. The anti-freezing switch is connected with the air supply fan in series and used for disconnecting when the temperature of the detected air flow is lower than or equal to the low-temperature threshold value. The delay switch is connected in series with the anti-freezing switch. The controller is communicated with the air supply fan, the anti-freezing switch and the delay switch; it is configured to turn off the air supply fan and turn off the delay switch for a set period of time when it is learned that the freeze switch is off. By this arrangement, it is ensured that the apparatus is able to provide effective freeze protection in cold seasons while reducing manufacturing and operating costs.

Description

Ventilation equipment with anti-freezing function

Technical Field

The present disclosure relates to the field of ventilation equipment, and in particular, to an anti-freezing control for ventilation equipment.

Background

The ventilation apparatus may transfer outdoor air to the indoor space or discharge indoor air to the outdoor space by using a blower, or may transfer outdoor air to the indoor space and discharge indoor air to the outdoor space at the same time. In cold winter, if the temperature of the outdoor air delivered to the indoor is too low, the indoor people feel uncomfortable. The existing anti-freeze solutions increase the temperature of the outdoor air delivered to the room by adding an electric auxiliary heating device inside the equipment. However, this increases the manufacturing costs of the device on the one hand; on the other hand, the electric auxiliary heating device needs to work during the operation of the whole equipment, so that the power consumption is high, and the operation cost of the equipment is greatly increased.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a passive-type anti-freeze control device for a ventilation apparatus to ensure that the apparatus can effectively provide anti-freeze in a cold season while reducing manufacturing and operating costs.

The embodiment of the disclosure provides a ventilation device with an anti-freezing function, which comprises a shell, an air supply fan, an anti-freezing switch, a time delay switch and a controller. The case has an air supply inlet for the intake of outdoor air, an air supply outlet for the discharge of outdoor air into the room, and an air supply passage defined between the air supply inlet and the air supply outlet. The air supply fan is disposed in the air supply passage to drive an air flow. The anti-freezing switch is connected with the air supply fan in series and used for disconnecting when the air flow temperature is detected to be lower than or equal to the low-temperature threshold value. The delay switch is connected in series with the anti-freezing switch. The controller is communicated with the air supply fan, the anti-freezing switch and the delay switch; it is configured to turn off the air supply fan and turn off the delay switch for a set period of time when it is learned that the anti-freeze switch is turned off.

In some embodiments, the controller is further configured to close the time delay switch after the set time period has elapsed, and to start the operation of the air supply fan if the freeze protection switch is closed at the time.

In some embodiments, the ventilation apparatus further comprises an air supply valve disposed proximate at least one of the air supply inlet and the air supply outlet; the controller is further configured to also close the air supply valve when the air supply fan is turned off.

In some embodiments, the housing further has an exhaust air inlet for the entry of indoor air, an exhaust air outlet for the discharge of indoor air to the outside of the room, and an exhaust air passage defined between the exhaust air inlet and the exhaust air outlet; the ventilation apparatus further includes an exhaust fan disposed in the exhaust passage to drive the flow of air.

In some embodiments, the exhaust fan is connected in parallel with the supply fan, the freeze switch, and the delay switch.

In some embodiments, the ventilation apparatus further includes a heat exchange member disposed at an intersection of the air supply passage and the air discharge passage.

In some embodiments, an anti-freeze switch is disposed in the exhaust passage between the exhaust outlet and the heat exchange member.

In some embodiments, the exhaust fan is disposed proximate the exhaust outlet and the freeze switch is disposed at an outlet of the exhaust fan.

In some embodiments, the ventilation device further comprises a voltage detection circuit connected in parallel across the freeze switch and the delay switch; the controller is also configured to judge the on-off of a loop where the anti-freezing switch is located according to the output voltage of the voltage detection circuit.

Technical solutions provided by one or more embodiments of the present disclosure may include the following advantageous effects: the passive anti-freezing scheme of the anti-freezing switch can reduce the manufacturing and running cost and avoid the electric energy consumption caused by active heating; in addition, frequent starting of the fan and the anti-freezing switch can be effectively avoided by setting the delay switch and delay control, and the service lives of parts and systems are further prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of the operation of a ventilation device in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the electrical connections of the ventilation apparatus shown in FIG. 1 to achieve freeze protection control;

fig. 3 is a flowchart illustrating an operation of the ventilation apparatus shown in fig. 1 to implement the anti-freezing control.

Detailed Description

The embodiments shown will be described in detail below with reference to the accompanying drawings. These embodiments are not intended to represent all embodiments consistent with the present disclosure, and structural, methodological or functional changes in accordance with these embodiments are intended to be encompassed by the present claims.

In some embodiments, the ventilator may be installed in a space above a ceiling of an indoor, may be an air intake device for introducing only external air into the indoor, or may be a total heat type ventilator. The present invention will be described in detail below by taking an example of a total heat type ventilator, but the present invention is equally applicable to a device for intake air alone. Referring to fig. 1, a ventilator 100 is a total heat type ventilator, which includes a rectangular housing 10. The housing 10 includes a plurality of tuyere tubes provided at both ends of a body thereof. The number of the tuyere pipe fittings is four, and the tuyere pipe fittings are distributed at two opposite ends of the shell body in pairs. The two air port pipe fittings positioned at one end of the shell body are respectively provided with an air supply inlet 102 for outdoor air to enter and an exhaust outlet 101 for indoor air to exhaust at the tail ends; the two tuyere pipes at the opposite ends of the housing body define an exhaust inlet 104 for the entrance of indoor air and an air supply outlet 103 for the discharge of outdoor air, respectively, at the ends thereof. As shown by arrows in the drawing, an air passage is formed in the housing, and includes an air supply passage (shown by a dotted line) defined between the air supply inlet 102 and the air supply outlet 103 for sending outside air from the outside to the inside, and an air discharge passage (shown by a solid line) defined between the air discharge inlet 104 and the air discharge outlet 101 for sending indoor air from the inside to the outside. The ventilation device 100 further includes an air supply valve disposed adjacent at least one of the air supply inlet 102 and the air supply outlet 103, and an air exhaust valve disposed adjacent at least one of the air exhaust inlet 104 and the air exhaust outlet 101. In the present embodiment, the air supply valve 22 and the air exhaust valve 21 are respectively provided near the air supply inlet 102 and the air exhaust outlet 101 for opening and closing the air supply passage and the air exhaust passage, respectively.

An exhaust fan 50 and an air supply fan 60 are also provided within the housing for driving the air flow within the exhaust and air supply passages, respectively. The exhaust fan 50 and the air supply fan 60 are of the same construction, and it is generally understood by those skilled in the art that the fan may be provided with a motor and an impeller in a cavity thereof, the impeller is driven by the motor, and then negative pressure is formed in the fan cavity by rotation of the impeller to drive air flow to enter from the fan inlet and then to be discharged from the fan outlet. The exhaust fan 50 may be disposed at any position in the exhaust passage, and the supply air fan 60 may be disposed at any position in the supply passage. In this embodiment, the exhaust fan 50 is disposed near the exhaust outlet 101, and the supply fan 60 is disposed near the supply outlet 103. As shown in fig. 1, a heat exchange member 30 is further disposed at the crossing position of the air supply path and the air discharge path so that the external air introduced from the outdoor through the air supply path and the indoor air discharged from the indoor through the air discharge path are heat exchanged in a non-contact manner in the heat exchange member, thereby supplying the heated external air into the indoor without giving uncomfortable feeling to the user in the cold winter. In addition, two filter cartridges 40 are disposed in the housing adjacent to the heat exchange part 30, wherein one filter cartridge 40 is located between the air supply inlet 102 and the heat exchange part 30 for filtering foreign materials in the external air to improve the cleanliness of the air supplied to the heat exchange part 30; another filter element is positioned between the exhaust air inlet 104 and the heat exchange member 30 for filtering the cleanliness of air supplied to the heat exchange member 30 to be discharged to the outside, to protect the heat exchange member and to extend the life thereof. The heat exchange member 30 and the filter cartridge 40 may be extracted to be replaced after a long-term use and a performance degradation.

Referring to the circuit schematic shown in fig. 2, an anti-freeze switch AF and a delay switch K4 are connected in series with the air supply fan 60. The anti-freeze switch AF may be a temperature controlled switch including a temperature sensing element, wherein the temperature sensing element is automatically turned on or off according to a temperature change. Thus, the freeze prevention switch AF may be used to automatically open to open the circuit when the temperature of the air flow is detected to be lower than or equal to a predetermined low temperature threshold, and may also be used to automatically close to reestablish the circuit when the temperature of the air flow is detected to be higher than or equal to a predetermined high temperature threshold. For a single intake ventilation apparatus for introducing only outdoor air, the anti-freeze switch may be disposed at any position in the air supply path. As shown in fig. 1, for the ventilation apparatus 100 having the heat exchange function, the anti-freeze switch AF may be provided in the exhaust passage between the exhaust outlet 101 and the heat exchange member 30; this is because, in cold regions, outdoor air is low, and the temperature of indoor discharge air after passing through the heat exchange element 30 is still high, where cold and hot air are collected to cause frosting on the surface of the heat exchange element and may further cause damage; preferably, the exhaust fan 50 is disposed near the exhaust outlet 101, and the anti-freeze switch AF is disposed at an outlet position of the exhaust fan 50. The time delay switch K4 is to avoid the problem that frequent switching occurs due to the influence of indoor higher-temperature air on the anti-freezing switch AF when the indoor and outdoor temperature difference is large, and further the fan is started and stopped frequently, so that the realization of the anti-freezing function is influenced, and the service lives of the fan and the anti-freezing switch are shortened. The delay switch K4 may be any one of a diode, a triode, a relay, a thyristor, an MOS transistor, and an IGBT, or may be a switch module or device formed by combining the above.

As shown in fig. 2, the ventilator 100 further includes the inhibitor switches K1, K2, K3, a voltage detection circuit connected in parallel across the anti-freeze switch AF and the delay switch K4, and the controller 70. The exhaust fan 50 is connected in parallel with the air supply fan 60, the anti-freezing switch AF and the delay switch K4; three parallel-connected range switches K1, K2, K3 are connected to the exhaust fan 50 and the supply fan 60, respectively, so that the fans can be selectively operated at three different speeds. The voltage detection circuit illustrated in fig. 2 is composed of two resistors R1 and R2 and a bidirectional optocoupler U1, and is connected to the controller 70 to output a voltage signal Vout, thereby detecting the on/off states of the loop of the anti-freeze switch AF and the delay switch K4. The controller 70 is typically used to sense and control the operation of the various circuit components within the ventilation unit. In some embodiments, the controller 70 may be a control circuit including a processor and a memory, and several electronic components connected in a wired manner. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or any conventional processor. The memory is used for storing program instructions for the processor to call to execute corresponding operations. In this embodiment, the controller 70 is a control center of the ventilation device 100, and may be electrically connected to various electronic components and devices, such as the exhaust fan 50, the air supply fan 60, the anti-freeze switch AF, and the delay switch K4, through lines by using various interfaces thereof to implement communication.

The following describes the operation steps of the controller 70 to implement the anti-freeze control in conjunction with the embodiment shown in fig. 3. When the exhaust fan is running (step 901), the controller 70 controls the delay switch K4 to be closed (step 902), and determines whether the anti-freeze switch AF is closed through the voltage detection circuit (step 903). If not, indicating that the outdoor air temperature is low, e.g. below 3 ℃, the anti-freeze switch AF is not triggered to close, and at this time, the outdoor air is not suitable for being introduced into the room, keeping the air supply fan 60 closed, and preferably keeping the air supply air valve 21 closed, while continuing to try the above judgment (step 903); if yes, indicating that the outdoor air temperature rises again (e.g. above 10 ℃) to trigger the anti-freeze switch AF to close, and at this time, the loop where the anti-freeze switch AF and the delay switch K4 are located is turned on, the controller 70 starts the air supply fan 60 to operate to introduce the outdoor air into the room (step 904), and further controls the air supply valve 21 to open if the air supply valve 21 is closed before.

After the air supply fan 60 is started, the controller 70 continuously monitors whether the anti-freeze switch AF is turned off or not through the voltage detection circuit (step 905), because once the anti-freeze switch AF is turned off, the circuit thereof is in an open state, and the controller 70 can determine through the detected high voltage. If the anti-freeze switch AF is found to be open, the controller turns off the air supply fan 60 (step 906), preferably simultaneously with the air supply valve 21, and controls the delay switch to open for a set period of time (step 907), such as 10 minutes, set to avoid frequent closing and opening of the anti-freeze switch AF by the higher temperature indoor air. The controller 70 counts the time and returns to the step 902 after the set time period passes, i.e. the delay switch K4 is closed, and then repeats the previous steps, i.e. continuously judges whether the anti-freezing switch AF is closed, if so, the air supply fan 60 is further started to operate.

The passive anti-freezing scheme of the anti-freezing switch can reduce the manufacturing and running cost and avoid the electric energy consumption caused by active heating; in addition, frequent starting of the fan and the anti-freezing switch can be effectively avoided by setting the delay switch and delay control, and the service lives of parts and systems are further prolonged.

In the disclosure above, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the second feature or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," or "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," or "beneath" a second feature may be directly under or obliquely under the first feature, or simply mean that the first feature is at a lesser elevation than the second feature.

The methods and apparatus disclosed in the above publications may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of the units in the controller is merely a division of one logic function, and other divisions may be realized in practice, for example, a plurality of units may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the connections between the above-discussed components, elements, and units may be electrical, mechanical, or other connections; the connection can be direct connection or indirect connection through some interfaces and the like; either wired or wireless.

In addition, the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; some or all of the elements can be selected according to actual needs to achieve the purpose of the solution of the disclosed embodiments. In addition, each functional unit in the above embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.

Claims

1. Ventilation equipment with function prevents frostbite, its characterized in that: the ventilation device comprises

A case having an air supply inlet for outdoor air to enter, an air supply outlet for outdoor air to discharge to the indoor, and an air supply passage defined between the air supply inlet and the air supply outlet;

an air supply fan disposed in the air supply passage to drive an air flow;

the anti-freezing switch is connected with the air supply fan in series and used for disconnecting when the temperature of the detected air flow is lower than or equal to a low-temperature threshold value;

the delay switch is connected with the anti-freezing switch in series;

the controller is communicated with the air supply fan, the anti-freezing switch and the delay switch; it is configured to turn off the air supply fan and turn off the delay switch for a set period of time when it is learned that the freeze switch is off.

2. The ventilation apparatus with an antifreeze function according to claim 1, wherein: the controller is further configured to close the time delay switch after the set time period has elapsed, and to start the air supply fan to operate if the freeze prevention switch is closed at that time.

3. The ventilation apparatus with an antifreeze function according to claim 1, wherein: the ventilation device also comprises an air supply valve arranged close to at least one of the air supply inlet and the air supply outlet; the controller is further configured to also close the air supply valve when the air supply fan is turned off.

4. The ventilation apparatus with an antifreeze function according to any one of claims 1 to 3, wherein: the casing is also provided with an exhaust inlet for allowing the indoor air to enter, an exhaust outlet for discharging the indoor air to the outside, and an exhaust passage defined between the exhaust inlet and the exhaust outlet; the ventilation device further includes an exhaust fan disposed in the exhaust passage to drive the flow of air.

5. The ventilation apparatus with an antifreeze function according to claim 4, wherein: the exhaust fan is connected with the air supply fan, the anti-freezing switch and the delay switch in parallel.

6. The ventilation apparatus with an antifreeze function according to claim 4, wherein: the ventilation apparatus further includes a heat exchange member provided at an intersection of the air supply passage and the air discharge passage.

7. The ventilation apparatus with an antifreeze function according to claim 6, wherein: the anti-freeze switch is disposed in the exhaust passage between the exhaust outlet and the heat exchange member.

8. The ventilation apparatus with an antifreeze function according to claim 7, wherein: the exhaust fan is close to the exhaust outlet, and the anti-freezing switch is arranged at the outlet of the exhaust fan.

9. The ventilation apparatus with an antifreeze function according to claim 1, wherein: the ventilation equipment also comprises a voltage detection circuit which is connected in parallel with the two ends of the anti-freezing switch and the delay switch; the controller is also configured to judge the on-off of a loop where the anti-freezing switch is located according to the output voltage of the voltage detection circuit.