CN115751564A - Ventilation with antifreeze function - Google Patents

Abstract

The invention provides a ventilation device with an antifreeze function, which includes a casing, an air supply fan, an antifreeze switch, a time delay switch, and a controller. The housing has an air supply inlet for entering outdoor air, an air supply outlet for discharging outdoor air into a room, and an air supply passage defined between the air supply inlet and the air supply outlet. An air supply fan is disposed in the air supply passage to drive air flow. An antifreeze switch is connected in series with the supply air blower for disconnection when the airflow temperature is detected to be below or equal to a low temperature threshold. The delay switch is connected in series with the antifreeze switch. The controller communicates with the air supply fan, the antifreeze switch, and the delay switch; it is configured to, when it is known that the antifreeze switch is off, turn off the air supply fan and turn off the delay switch for a set period of time. Through this setting, it is ensured that the equipment can effectively provide antifreeze in cold seasons while reducing manufacturing and operating costs.

Description

Ventilation with antifreeze function

technical field

The present disclosure relates to the field of ventilation equipment, in particular to an antifreeze control of ventilation equipment.

Background technique

Ventilation equipment can use fans to deliver outdoor air to the room, or to discharge indoor air to the outside, or to deliver outdoor air to the room and exhaust indoor air to the outside at the same time. In the cold winter, if the temperature of the outdoor air delivered to the room is too low, it will make the people in the room feel uncomfortable. The existing antifreeze solution is to increase the temperature of the outdoor air delivered to the room by adding an electric auxiliary heating device in the equipment. However, on the one hand, this will increase the manufacturing cost of the equipment; on the other hand, since the electric auxiliary heating device needs to work during the entire operation of the equipment, the power consumption is large, and the operating cost of the equipment is also greatly increased.

Contents of the invention

In order to overcome the problems in related technologies, the present disclosure provides a passive antifreeze control device suitable for ventilation equipment, so as to ensure that the equipment can effectively provide antifreeze in cold seasons while reducing manufacturing and operating costs.

An embodiment of the present disclosure provides a ventilation device with an antifreeze function, which includes a housing, an air supply fan, an antifreeze switch, a time delay switch, and a controller. The housing has an air supply inlet for entering outdoor air, an air supply outlet for discharging outdoor air into a room, and an air supply passage defined between the air supply inlet and the air supply outlet. An air supply fan is disposed in the air supply passage to drive air flow. An antifreeze switch is connected in series with the supply air blower for disconnection when the airflow temperature is detected to be below or equal to a low temperature threshold. The delay switch is connected in series with the antifreeze switch. The controller communicates with the air supply fan, the antifreeze switch, and the delay switch; it is configured to, when it is known that the antifreeze switch is off, turn off the air supply fan and turn off the delay switch for a set period of time.

In some embodiments, the controller is further configured to close the delay switch after the above-mentioned set time period elapses, and start the air supply fan to run if the antifreeze switch is closed at this time.

In some embodiments, the ventilation device further includes an air supply valve disposed close to at least one of the air supply inlet and the air supply outlet; the controller is further configured to close the air supply valve when the air supply blower is turned off.

In some embodiments, the housing further has an exhaust inlet for entering indoor air, an exhaust outlet for exhausting indoor air to the outside, and an exhaust passage defined between the exhaust inlet and the exhaust outlet The ventilation device also includes an exhaust fan arranged in the exhaust passage to drive air flow.

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

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

In some embodiments, the antifreeze switch is disposed in the exhaust passage, and is located between the exhaust outlet and the heat exchange component.

In some embodiments, the exhaust fan is arranged near the exhaust outlet, and the antifreeze switch is arranged at the outlet of the exhaust fan.

In some embodiments, the ventilator further includes a voltage detection circuit connected in parallel to both ends of the antifreeze switch and the delay switch; the controller is further configured to determine whether the circuit where the antifreeze switch is located is on or off according to the output voltage of the voltage detection circuit.

The technical solution provided by one or more embodiments of the present disclosure may include the following beneficial effects: by setting the antifreeze switch, this passive antifreeze solution can reduce manufacturing and operating costs, and avoid power consumption caused by active heating; The time switch and delay control can effectively avoid the frequent start of the fan and antifreeze switch, thereby prolonging the life of parts and systems.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure. For those skilled in the art, other drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic diagram of the working principle of the ventilation device in an embodiment of the present disclosure;

Fig. 2 is a schematic diagram of the circuit connection of the ventilation equipment shown in Fig. 1 to realize antifreeze control;

Fig. 3 is a flow chart of the ventilation equipment shown in Fig. 1 implementing antifreeze control.

Detailed ways

The illustrated embodiments will be described in detail below in conjunction with the accompanying drawings. However, these embodiments do not represent all embodiments consistent with the present disclosure, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the requirements of the appended claims. within the scope of protection.

In some embodiments, the ventilation device can be installed in the space above the indoor ceiling, and it can be an air intake device only used to introduce external air into the room, or it can be a total heat ventilation device. Hereinafter, the present invention will be described in detail by taking total heat ventilation equipment as an example, but the present invention is also applicable to equipment used solely for air intake. Referring to FIG. 1 , the ventilating device 100 is a total heat ventilation device, which includes a rectangular shell 10 . The casing 10 includes several tuyere tubes arranged at both ends of the body. There are four of these several tuyere pipe fittings, which are distributed in pairs at opposite ends of the housing body. The two tuyere fittings located at one end of the housing body are respectively defined at their ends with an air supply inlet 102 for entering outdoor air and an exhaust outlet 101 for exhausting indoor air; The tuyere pipes are respectively defined at the ends thereof with an exhaust inlet 104 for entering indoor air and an air supply outlet 103 for exhausting outdoor air. As shown by the arrow in the figure, an air path is formed in the casing, including an air supply path (as shown by a dotted line) defined between the air supply inlet 102 and the air supply outlet 103 to send the external air from the outside to the room. And the exhaust path (as shown by the solid line) that is defined between the exhaust inlet 104 and the exhaust outlet 101 to send the indoor air from the indoor to the outdoor. The ventilator 100 also includes an air supply valve disposed close to at least one of the air supply inlet 102 and the air supply outlet 103 , and an exhaust air valve disposed adjacent to at least one of the exhaust inlet 104 and the exhaust outlet 101 . In this embodiment, the air supply valve 22 and the exhaust air valve 21 are respectively arranged close to the air supply inlet 102 and the exhaust outlet 101 for opening and closing the air supply passage and the exhaust passage respectively.

An exhaust fan 50 and an air supply fan 60 are also provided in the casing to drive the airflow in the exhaust passage and the air supply passage respectively. The exhaust fan 50 and the air supply fan 60 adopt the same structure. It is generally understood by those skilled in the art that the fan can be provided with a motor and an impeller in its cavity, and the impeller is driven by the motor, and then the impeller is rotated in the fan chamber. Negative pressure is formed in the body, driving the airflow to enter from the fan inlet, and then discharged from the fan outlet. The exhaust fan 50 can be arranged at any position in the exhaust passage, and the air supply fan 60 can be arranged at any position in the air supply passage. In this embodiment, the exhaust fan 50 is arranged near the exhaust outlet 101 , and the air supply fan 60 is arranged near the air supply outlet 103 . As shown in Figure 1, a heat exchange component 30 is also arranged at the intersection of the air supply passage and the exhaust passage, so that the external air introduced from the outside through the air supply passage and the indoor air discharged from the room through the exhaust passage Non-contact ground heat exchange is carried out in the heat exchange part, so that the outside air is heated and supplied into the room, which will not bring discomfort to the user in the cold winter. In addition, two filter elements 40 are also arranged near the heat exchange component 30 in the casing, and one filter element 40 is located between the air supply inlet 102 and the heat exchange component 30 for filtering impurities in the external air to improve the supply of the heat exchange component. 30 air cleanliness; another filter element is located between the exhaust inlet 104 and the heat exchange component 30, used to filter the cleanliness of the air supplied to the heat exchange component 30 to be discharged to the outside, so as to protect the heat exchange component and prolong its life . The above-mentioned heat exchange component 30 and filter element 40 can be taken out for replacement after being used for a long time and performance degraded.

With reference to the circuit diagram shown in FIG. 2 , an antifreeze switch AF and a delay switch K4 are connected in series with the air supply fan 60 . The antifreeze switch AF may be a temperature control switch including a temperature sensing element, wherein the temperature sensing element will be automatically turned on or off as the temperature changes. Therefore, the antifreeze switch AF can be used to automatically open to disconnect the circuit when it detects that the airflow temperature is lower than or equal to a predetermined low temperature threshold, and can also be used to detect that the airflow temperature is higher than or equal to a predetermined low temperature threshold. Automatically closes at a high temperature threshold to re-establish circuit connection. For single-inlet ventilators that are only used to bring in outside air, the antifreeze switch can be placed anywhere in the air supply path. As shown in Figure 1, for ventilation equipment 100 with heat exchange function, the antifreeze switch AF can be arranged in the exhaust passage, and between the exhaust outlet 101 and the heat exchange component 30; this is because, in cold regions , the outdoor air is very low, and the temperature of the indoor exhaust air after passing through the heat exchange unit 30 is still high, and the convergence of cold and hot air here will cause frost on the surface of the heat exchange unit and may cause further damage; preferably, the exhaust fan 50 It is set near the exhaust outlet 101 , and the antifreeze switch AF is set at the outlet of the exhaust fan 50 . The time delay switch K4 is to avoid the problem of frequent switching of the antifreeze switch AF due to the influence of the indoor high temperature air when the temperature difference between indoor and outdoor is large, which will cause the fan to start and stop frequently. On the one hand, it affects the realization of the antifreeze function, and on the other hand On the one hand, it also reduces the life of the fan and antifreeze switch. The delay switch K4 can be any one of diodes, triodes, relays, thyristors, silicon controlled rectifiers, MOS tubes and IGBTs, and can also be a switch module or device combined with the above.

As shown in FIG. 2 , the ventilation device 100 also includes gear switches K1 , K2 , K3 , a voltage detection circuit connected in parallel to both ends of the antifreeze switch AF and the delay switch K4 , and a controller 70 . The exhaust fan 50 is connected in parallel with the air supply fan 60, the antifreeze switch AF, and the delay switch K4; the three parallel gear switches K1, K2, and K3 are respectively connected with the exhaust fan 50 and the air supply fan 60, so that the fan Can be selectively run at three different speeds. The voltage detection circuit as shown in Figure 2 is composed of two resistors R1, R2 and a bidirectional optocoupler U1, and is connected with the controller 70 to output the voltage signal Vout, thereby detecting the on-off of the antifreeze switch AF and the delay switch K4 circuit state. The controller 70 is generally used to detect and control the work of various circuit devices in the ventilation equipment. In some embodiments, the controller 70 may be a control circuit including a processor, a memory, and several electronic components connected in a certain wiring manner. The processor can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor can be a microprocessor or any conventional processor. The memory is used to store program instructions to be invoked by the processor to perform corresponding operations. In this embodiment, the controller 70 is the control center of the ventilator 100, and various interfaces can be used to communicate with various electronic components and devices, such as the exhaust fan 50, the air supply fan 60, the antifreeze switch AF, and the delay switch K4 Electrically connected to achieve communication, of course, in other embodiments, the controller can also communicate with various electronic components and devices in a wireless manner.

The working steps of the controller 70 to realize antifreeze control are described below 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 close (step 902), and judges whether the antifreeze switch AF is closed through the voltage detection circuit (step 903). If no, it indicates that the outdoor air temperature is relatively low, such as lower than 3°C, and the antifreeze switch AF is not triggered to close. At this time, the outdoor air should not be introduced into the room, then keep the air supply fan 60 closed, and preferably keep the air supply valve 21 closed. , and continue to try the above judgment (step 903); if yes, it indicates that the outdoor air temperature rises (such as higher than 10° C.) and triggers the antifreeze switch AF to be closed. Then the controller 70 starts the air supply fan 60 to introduce outdoor air into the room (step 904 ), if the air supply valve 21 has been closed before, then further controls the supply air valve 21 to open.

After the air supply fan 60 is started, the controller 70 continuously monitors whether the antifreeze switch AF is disconnected (step 905) through the voltage detection circuit, because once the antifreeze switch AF is disconnected, its circuit is in an open circuit state, and the controller 70 can detect the The high voltage is judged. If it is found that the antifreeze switch AF is disconnected, the controller closes the air supply blower 60 to run (step 906), preferably, the supply air valve 21 can be closed at the same time, and the controller controls the delay switch to disconnect a set period of time (step 906). Step 907), for example, 10 minutes, which is set to prevent the antifreeze switch AF from being frequently closed and disconnected due to the influence of the indoor air at a relatively high temperature. The controller 70 counts and returns to step 902 after the set period of time passes, that is, closes the delay switch K4, and then repeats the previous steps, that is, continuously judges whether the antifreeze switch AF is closed, and if so, further starts the air supply fan 60 to run.

By setting the antifreeze switch, which is a passive antifreeze solution, the manufacturing and operating costs can be reduced, and the power consumption caused by active heating can be avoided; in addition, the frequent start of the fan and antifreeze switch can be effectively avoided by setting the delay switch and delay control, thereby prolonging the life of parts and systems.

In the above disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first and second features pass through an intermediary indirect contact. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature. "Below", "beneath" and "under" the first feature may mean that the first feature is directly below or obliquely below the second feature, or it just means that the first feature is less horizontally than the second feature.

The methods and devices disclosed in the above publications can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units in the controller is only a division of logic functions. In actual implementation, there may be other division methods. For example, multiple units can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the connection between the components, components, and units discussed above may be electrical, mechanical, or other connection forms; it may be a direct connection, or it may be an indirect connection through some interfaces; it may be a wired connection, Wireless communication is also possible.

In addition, the units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units; some or all of the units may be selected according to actual needs to implement the disclosed embodiments purpose of the program. In addition, each functional unit in each of the foregoing embodiments may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (9)

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.

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