Air valve device, fresh air ventilator with air valve device and control method of fresh air ventilator

Abstract

The invention discloses an air valve device, a fresh air ventilator with the air valve device and a control method of the fresh air ventilator. The fresh air valve and the return air valve are arranged on the two sides of the air duct partition plate respectively, the motor is arranged on a panel of the air duct partition plate, and the two ends of a shaft of the motor extend out to be connected with the fresh air valve and the return air valve respectively. When the motor rotates forwards and backwards, one of the two air valves can be driven to be opened, and the other air valve can be driven to be closed at the same time. When the air valve device is applied to the fresh air machine, different opening states of the fresh air valve and the return air valve are controlled to control the flow direction of air absorbing heating of the motor in the independent air channel, the influence of heating of the motor on the indoor temperature can be avoided during refrigeration, heating of the motor can be utilized during heating, and the heat exchange efficiency is improved. The fresh air ventilator can be used for heating in winter and refrigerating in summer, and is reasonable in structural arrangement.

Description

Technical Field

[0001] The present invention relates to fluid conveying equipment, and in particular to a wind valve device capable of utilizing motor heat generation, a new air blower with the wind valve device, and a control method thereof. Background Art

[0002] At present, the conventional fresh air blower used for gas heat exchange (please refer to Figure 1 ), basically including a heat exchange core 1 arranged in the middle, a fresh air inlet 2 arranged on the upper right side of the heat exchange core, corresponding to a fresh air outlet 3 arranged on the lower left side of the heat exchange core; a return air inlet 4 arranged on the upper left side of the heat exchange core, corresponding to a return air outlet 5 arranged on the lower right side of the heat exchange core. It also includes a fresh air fan 6 and a fresh air motor 7 arranged in the fresh air flow duct, and a return air fan 8 and a return air motor 9 arranged in the return air flow duct. After the fresh air and the return air cross through different air ducts in the heat exchange core for heat exchange, the fresh air is input into the room and the return air is discharged outdoors. The fresh air motor and the return air motor are usually installed in the air duct. The heat generated by the motor operation will affect the heat exchange efficiency of the fresh air fan, resulting in an increase in the fresh air outlet temperature. That is, the heat exchange efficiency is reduced when the fresh air machine is in the cooling state, and the heat exchange efficiency is improved in the heating state. Therefore, in order to improve the heat exchange efficiency, it is necessary to avoid the influence of motor heating during cooling, and to use the heat generated by the motor during heating.

[0003] Chinese patent CN204923359U discloses several energy recovery fresh air ventilators. One type is an energy recovery device used in winter as a heating season to recover heat from return air. It installs both the fresh air motor and the return air motor in the fresh air duct. Figure 1 , Figure 2 As shown, the heat generated by the fresh air motor and the return air motor is sent into the room along with the fresh air, which can increase the outlet temperature of the fresh air, thereby improving the energy recovery efficiency of the recovery device under heating conditions.

[0004] The other type is an energy recovery device used in the summer to recover the cooling capacity of the return air during the cooling season. Both the fresh air motor and the return air motor can be installed in the return air duct, such as Figure 3 , Figure 4 As shown, the heat generated by the fresh air motor and the return air motor is discharged outdoors with the return air, which can reduce the outlet temperature of the fresh air and thereby improve the energy recovery efficiency of the recovery device under refrigeration conditions.

[0005] However, the technical solution disclosed in this patent has the following problems:

[0006] 1. As it Figure 1 , Figure 2 As shown, the fresh air motor and the return air motor are both in the fresh air duct. This type of fresh air fan is only beneficial to the heating state; Figure 3 , Figure 4As shown, the fresh air motor and the return air motor are both in the return air duct, and this type of fresh air fan is only beneficial to the cooling state. That is, the fresh air fan cannot be used for cooling in summer and heating in winter.

[0007] 2. As it Figure 3 As shown, the fresh air motor is located in the return air inlet duct, and the motor generates heat, which increases the return air inlet temperature. In the heat exchange core, when the incoming return air exchanges heat with the incoming fresh air, the cooling effect on the fresh air will be reduced, which is not conducive to refrigeration.

[0008] 3. As it Figure 2 , Figure 4 As shown, the fresh air outlet direction and the return air outlet direction are set at 90°, which is inconsistent with the usual installation method of the air duct going straight in and out from outdoor to indoor and indoor to outdoor, so that the air duct needs to be bent 90° for air supply, which leads to longer air duct, increased wind resistance and higher cost.

[0009] 4. The heat exchange core of this type of fresh air fan needs to be placed vertically on the ground. The diamond cross section in the figure is the top view of the heat exchange core. Under the condition of the same heat exchange core length, the height of the whole machine needs to be increased compared with the horizontally placed heat exchange core, and the installation space of the whole machine is easily limited.

[0010] Therefore, how to overcome the defects of the existing fresh air fans that cannot be used for both cooling and heating and have unreasonable settings is a problem that needs to be solved in this field. Summary of the invention

[0011] In order to solve the technical problems that the existing fresh air fan cannot be used for both cooling and heating and has unreasonable settings, the present invention provides a damper device that utilizes the heat generated by a motor, a fresh air fan and a control method thereof. The fresh air fan can be used for both heating in winter and cooling in summer, and has a reasonable structural setting. The influence of the motor's heating can be avoided during cooling, and the motor's heating can be utilized during heating, thereby greatly improving the heat exchange efficiency.

[0012] The present invention provides an air valve device, which includes an air duct partition, a fresh air valve and a return air valve respectively arranged on both sides of the air duct partition, and a motor arranged on the air duct partition panel, and the two ends of the motor shaft are respectively connected to the fresh air valve and the return air valve; when the motor rotates forward and reverse, it can simultaneously drive one of the two air valves to open and the other air valve to close.

[0013] Preferably, the fresh air valve and the motor are arranged on the same side of the air duct partition, and the return air valve is arranged on the other side of the air duct partition.

[0014] Preferably, the air valve includes a base arranged on the air duct partition, a bracket hinged to the base at one end, and the other end of the bracket is connected to a baffle; the motor shaft drives the bracket to rotate, so that the baffle can close or open the air duct hole arranged on the air duct partition.

[0015] Preferably, shaft holes are provided on both sides of the base, and a mounting opening is provided around one of the shaft holes; a hinge shaft is provided at one end of the bracket, and both ends of the hinge shaft are provided in the shaft holes on both sides of the base, so that the bracket and the base form a hinge connection.

[0016] Preferably, the axis of the hinge shaft is provided with an oblong hole, and the motor shaft end is an oblong structure adapted to the oblong hole of the hinge shaft; when the motor shaft is inserted into the oblong hole of the hinge shaft, the motor can drive the bracket to swing relative to the base.

[0017] Preferably, the oblong hole of the hinge shaft is a through hole or an oblong hole is provided at one end.

[0018] Preferably, the surfaces of the baffle plate and the air duct partition plate facing each other are each provided with a layer of sealing gasket, and when the air valve is closed, the two facing sealing gaskets fit tightly.

[0019] Preferably, the opening of the air valve is divided into several gears, and the motor is a stepping motor to control and adjust the opening of the air valve.

[0020] The present invention provides a fresh air fan, comprising a fresh air fan and a fresh air motor, a return air fan and a return air motor. The fresh air fan and the return air fan are respectively arranged in respective air outlet ducts of the fresh air fan, the fresh air motor and the return air motor are located in an independent air duct of the fresh air fan, the air valve device is arranged between the independent air duct and the fresh air fan and the return air fan, the fresh air valve of the air valve device corresponds to the fresh air outlet duct, and the return air valve is located in the return air outlet duct; when the motor rotates forwards and reverses, it can drive one of the two air valves to open, so that the independent air duct is connected to the corresponding opened air outlet duct, while the other air valve is closed.

[0021] The present invention also provides a control method for the fresh air fan, the steps of which are:

[0022] When it is detected that the indoor temperature is lower than the outdoor temperature, the system is in a cooling state. At this time, the fresh air valve is completely closed, and the return air valve is completely opened to discharge the heat of the motor in the independent air duct to the outside through the return air outlet duct.

[0023] When it is detected that the indoor temperature is greater than the outdoor temperature, the heating state is in progress, at which time the return air valve is completely closed, the fresh air valve is completely opened, and the heat of the motor in the independent air duct is sent into the room through the fresh air outlet duct;

[0024] When it is detected that the temperature difference between the fresh air outlet temperature and the indoor temperature is greater than a preset condition, the opening of the fresh air valve is dynamically adjusted according to the temperature difference between the fresh air outlet temperature and the indoor temperature until the temperature difference between the fresh air outlet temperature and the indoor temperature meets the preset condition.

[0025] Preferably, the temperature difference between the fresh air outlet temperature and the indoor temperature is preset to be △T, and the initial indoor temperature is detected to be Tn; the outdoor temperature is Tw; and the fresh air outlet temperature is Tx;

[0026] When it is detected that Tn<Tw, indicating that the room is in cooling state, the return air valve is fully opened, the fresh air valve is fully closed, the heat of the motor in the independent air duct is discharged outdoors, and the temperature change is continuously monitored;

[0027] When it is detected that Tn>Tw, indicating that the room is in heating state, the return air valve is completely closed, the fresh air valve is completely opened, and the heat of the motor in the independent air duct is input into the room;

[0028] When it is detected that Tn>Tw, if the calculation comparison is: Tx-Tn>△T, that is, the condition of Tx-Tn>+△T is met, it means that the indoor temperature is high, and the opening of the fresh air valve is adjusted to reduce one level to reduce the heat input into the indoor motor;

[0029] If the calculated temperature difference is Tx-Tn<+△T, continue to monitor the temperature change and compare;

[0030] When the detected fresh air outlet temperature Tx becomes low, if the calculation comparison: Tx-Tn=>△T, that is, the condition of Tx-Tn<-△T is not met, then it is necessary to first compare the absolute value of the difference between the fresh air outlet temperature and the indoor temperature with the preset temperature difference value: if |Tx-Tn|>△T, that is, the condition of |Tx-Tn|<△T is not met, adjust the opening of the fresh air valve and reduce it by one level to further reduce the motor heat input into the room;

[0031] If the outdoor temperature Tw is detected to be lower, and the measured fresh air outlet temperature Tx is lowered again, if the calculation and comparison: |Tx-Tn|<△T, that is, the condition of |Tx-Tn|<△T is met, the opening of the fresh air valve remains unchanged, and the temperature change is continued to be detected and compared;

[0032] When further detection shows that the fresh air outlet temperature Tx becomes lower, if the calculation and comparison shows that: Tx-Tn<-△T, that is, the condition of Tx-Tn<-△T is met, the opening of the fresh air valve is increased by 1 level, the motor heat input into the room is increased, and the temperature changes are continued to be monitored and compared.

[0033] The air valve device provided by the present invention is provided with a fresh air valve and a return air valve on both sides of the air duct partition, and then a motor arranged between the fresh air valve and the return air valve is used to simultaneously drive one of the two air valves to open and the other air valve to close. The structure of the arrangement is simple, and the two air valves can be controlled to perform opposite actions at the same time, and the operation is convenient. The outer end of the bracket is connected to a baffle and the inner end is hinged to the base connected to the air duct partition. The hinge shaft of the bracket is a hollow structure, and the inner hole is an oblong hole. When the motor shaft is inserted into the oblong hole of the hinge shaft, the motor can drive the bracket to rotate, so that the baffle on it can close or open the air duct hole arranged on the air duct partition. The inner hole of the hinge shaft of the bracket is set to a non-circular hole structure. As long as the matching motor shaft structure is inserted, the motor shaft can be conveniently connected with the hinge shaft of the bracket and rotated together, and the connection is reliable and the rotation is easy. An installation opening is arranged around an axis hole of the base, so that the corresponding axis section of the hinge shaft of the bracket is conveniently embedded in the axis hole through the installation opening, which is convenient for installation, so that the bracket and the base can quickly form a hinge connection. The surfaces of the baffle and the air duct partition facing each other are each provided with a layer of sealing gasket, which improves the sealing performance when the air valve is closed. The opening of the air valve is divided into several gears, and the opening of the air valve is adjusted by a stepper motor. The adjustment is flexible and the response is fast.

[0034] The fresh air fan provided by the present invention has the fresh air fan and the return air fan respectively arranged in their respective air outlet ducts, and the fresh air motor and the return air motor arranged in an independent air duct in the fresh air fan, and the air valve device provided by the present invention is arranged between the independent air duct and the fresh air fan and the return air fan. When the motor in the air valve device rotates forward and reversely, it can drive one of the two air valves to open, so that the independent air duct is connected to the corresponding opened air outlet duct, and the other air valve is closed at the same time. By controlling the different opening states of the fresh air valve and the return air valve, the flow direction of the gas that absorbs the heat of the motor in the independent air duct is controlled, and the influence of the heat of the motor on the indoor temperature can be avoided during cooling, and the heat of the motor can be used during heating, so as to achieve the purpose of utilizing or avoiding the influence of the heat of the motor to improve the heat exchange efficiency of the fresh air fan. The fresh air fan can be used for heating in winter and cooling in summer, and the structure is reasonably arranged. It effectively solves the technical problems existing in the existing fresh air fans.

[0035] The control method of the fresh air fan provided by the present invention makes a comparison based on the temperature value detected in real time. The corresponding air valve is opened or closed according to different comparison results. The control method has relatively fine data, and the air valve switch is adjusted timely and reasonably. The opening of the air valve can also be adjusted in stages according to the indoor temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A three-dimensional schematic diagram of an embodiment of the air valve device provided herein;

[0037] Figure 2 for Figure 1 The main view;

[0038] Figure 3 for Figure 1 Left view of;

[0039] Figure 4 for Figure 1 The front view of the middle base;

[0040] Figure 5 for Figure 4 A three-dimensional view of the base;

[0041] Figure 6 for Figure 1 A three-dimensional view of the middle bracket;

[0042] Figure 7 for Figure 6 Front view of the bracket;

[0043] Figure 8 for Figure 7 Left view;

[0044] Fig. 9 This is a schematic diagram of the working condition of the fresh air machine provided by the present invention in the heating state;

[0045] Fig.10 for Fig. 9 A three-dimensional diagram of the working state of the air valve device in the heating state;

[0046] Fig.11 A schematic diagram of the working condition of the fresh air machine provided by the present invention in the cooling state;

[0047] Fig.12 for Fig.11 A three-dimensional diagram of the working state of the air valve device in the cooling state;

[0048] Fig.13 This is a schematic flow chart of the fresh air fan control method provided by the present invention.

[0049] In the figure: 1-heat exchange core, 2-fresh air inlet, 3-fresh air outlet, 4-return air inlet,

[0050] 5-return air outlet, 6-fresh air fan, 7-fresh air motor, 8-return air fan, 9-return air motor,

[0051] 10-air valve partition, 11-fresh air valve, 12-return air valve, 13-motor, 14-motor shaft, 15-base, 16-bracket, 17-baffle, 18-air duct hole, 19-shaft hole, 20-installation opening, 21-hinge shaft, 22-flat round hole, 23-sealing gasket. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0053] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of the air valve device provided by the present invention comprises an air duct partition plate 10 having a substantially cross-shaped transverse cross section, a fresh air valve 11 disposed on the left side plate surface of the air duct partition plate, and a return air valve 12 disposed on the right side plate surface of the air duct partition plate (please refer to Fig.10 , Fig.12 ), a motor 13 is arranged on the air duct partition panel. In this embodiment, Figure 2 As shown, the fresh air valve and the motor are arranged on the same side of the air duct partition, and the return air valve is arranged on the back of the air duct partition. The motor shaft 14 of the motor is a two-way extended setting, and the two ends of the motor shaft are respectively connected to the fresh air valve and the return air valve. The connection method can be various, as long as when the motor rotates forward and reverse, it can drive one of the two air valves to open and the other air valve to close at the same time. For example, when the motor rotates forward, it can drive the fresh air valve 11 to open, such as Figure 3 As shown, the fresh air valve is fully opened at an angle of 90°, and the return air valve 12 is completely closed. When the motor is reversed, the return air valve is fully opened, and the fresh air valve is completely closed. This design has a simple structure, and the forward and reverse rotations of the two air valves can be controlled simultaneously by the forward and reverse rotations of the motor, which is convenient to operate.

[0054] The fresh air valve and the return air valve have the same structure, but are respectively arranged on the two side panels of the air duct partition (see Fig.10 , Fig.12 ).like Figures 4 to 8 As shown, the air valve comprises: a base 15 arranged on the air duct partition 10, a bracket 16 whose inner end is hinged to the base, and a baffle 17 connected to the outer end of the bracket by bolts. When installing, a fixing nut can be riveted on the baffle, and then connected to the bracket by bolts, which is convenient for installation. The motor shaft 14 of the motor is connected to the bracket 16, and the rotation of the motor can drive the bracket 16 to rotate relative to the base 15, thereby driving the baffle 17 connected to the outer end of the bracket to close or open the air duct hole 18 arranged on the air duct partition 10 (please refer to the embodiment of the present invention). Figure 1-Figure 3). In this embodiment, shaft holes 19 are provided on both sides of the base, and a mounting opening 20 is provided around the shaft hole on the right side. A hinge shaft 21 is provided at the inner end of the bracket, and the two ends of the hinge shaft are respectively installed in the shaft holes 19 on both sides of the base, so that the bracket and the base form a hinge connection. The two sets of air valves are designed to have the same structure, and the two ends of the motor shaft 14 are respectively connected to the brackets in the two air valves. Therefore, as long as the motor rotates, the brackets 16 in the two air valves can be controlled to drive the baffles 17 to rotate forward and backward, thereby correspondingly opening or closing the air duct holes 18 on the air duct partition 10. This setting has a compact structure, light transmission, and convenient maintenance. Since the mounting opening 20 is provided around the shaft hole on one side of the base, during installation, the left shaft head of the hinge shaft 21 of the bracket is first inserted into the shaft hole 19 on the left side of the base, and then the right shaft head of the hinge shaft is inserted into the shaft hole on the right side of the base through the mounting opening 20. This facilitates installation, thereby allowing the bracket and the base to be conveniently connected.

[0055] In this embodiment, Figure 6 , Figure 8 As shown, the support hinge shaft 21 is designed as a hollow structure, and its inner hole is set as an oblate hole 22, and the motor shaft end is also designed as an oblate structure adapted to the oblate hole 22 of the hinge shaft. When the motor shaft is inserted into the oblate hole from one end of the hinge shaft, a complete cylinder is formed after the flat positions are clamped together, and the two will not rotate relative to each other. When the support hinge shaft is clamped into the base shaft hole, the motor is started and the support can be driven to rotate relative to the base. According to needs, the oblate hole 22 of the support hinge shaft can be set as a through hole, or an oblate hole of a certain depth can be set only at one end of the hinge shaft. In fact, the inner hole of the support hinge shaft can be designed as a non-circular hole, as long as the motor shaft end can drive the hinge shaft of the support to rotate together after being inserted into the inner hole of the hinge shaft. For example, the inner hole can be a rhombus hole, a square hole, a polygonal hole, etc., and the inserted motor shaft is adapted to the shape of the inner hole. The hinge shaft of the bracket is set to a non-circular inner hole structure. As long as the matching motor shaft structure is inserted, the motor shaft and the hinge shaft of the bracket can be easily connected and rotated together. The installation is convenient, the connection is reliable, and the rotation is easy.

[0056] like Figure 1 As shown, the surfaces of the baffle plate 17 and the air duct partition plate 10 opposite to each other are each provided with a layer of sealing pad 23. The sealing pad can be made of sponge material. When the air valve is closed, the baffle plate 17 and the two opposite sealing pads on the air duct partition plate 10 are closely fitted, thereby improving the sealing performance when the air valve is closed.

[0057] The opening of the air valve of the present invention is divided into several gears, that is, the opening angle of the baffle 17 can be set in stages. The motor adopts a stepper motor, which can conveniently control and adjust the opening of the air valve, flexibly adjust the conveying air volume, and respond quickly.

[0058] The air valve device provided by the present invention can be applied to a fresh air blower. Fig. 9As shown, the present invention provides an embodiment of a fresh air fan, which includes a heat exchange core 1 horizontally arranged in the middle, a fresh air inlet 2 arranged on the upper right side of the heat exchange core, corresponding to a fresh air outlet 3 arranged on the lower left side of the heat exchange core; a return air inlet 4 arranged on the upper left side of the heat exchange core, corresponding to a return air outlet 5 arranged on the lower right side of the heat exchange core. It also includes a fresh air fan 6 arranged in the fresh air outlet duct, and a return air fan 8 arranged in the return air outlet duct. The present invention arranges the fresh air motor 7 and the return air motor 9 in an independent air duct in the fresh air fan, that is, the independent air duct is a closed independent space relative to the interior of the fresh air fan. The air valve device provided by the present invention is arranged between the independent air duct and the fresh air fan and the return air fan, and the fresh air valve 11 of the air valve device corresponds to the fresh air outlet duct of the fresh air fan, and the return air valve 12 is located in the return air outlet duct. That is, a fresh air valve is provided between the independent air duct and the fresh air outlet duct; a return air valve is provided between the independent air duct and the return air outlet duct. When the motor rotates forward and reverse, it can drive one of the two air valves to open, so that the independent air duct is connected to the corresponding opened air outlet duct, while the other air valve is closed.

[0059] like Fig. 9 , Fig.10 As shown, after the fresh air and the return air cross through different air ducts in the heat exchange core for heat exchange, the fresh air is input into the room and the return air is discharged outdoors. In the cold winter, the indoor temperature needs to be heated up, and the fresh air fan is in the heating state. The fresh air valve 11 in the air valve device can be opened by the rotation of the motor 13, so that the independent air duct is connected to the fresh air outlet duct, and the return air valve 12 is closed at the same time. At this time, under the action of the fresh air fan 6, the airflow entering the independent air duct sends the heat generated by the fresh air motor 7 and the return air motor 9 into the fresh air outlet duct, and is mixed with the outdoor fresh air heated by the heat exchange core and input into the room. In this way, the heat generated by the motor is used to increase the temperature of the fresh air, thereby improving the heat exchange efficiency of the fresh air fan, recycling energy, and protecting the environment.

[0060] like Fig.11 , Fig.12 As shown, in the hot summer, the indoor temperature needs to be lowered, and the fresh air fan is in a cooling state. The return air valve 12 in the air valve device can be opened by controlling the rotation of the motor 13, so that the independent air duct is connected to the return air outlet duct, and the fresh air valve 11 is closed at the same time. At this time, under the action of the return air fan 8, the airflow entering the independent air duct sends the heat generated by the fresh air motor 7 and the return air motor 9 into the return air outlet duct, and is mixed with the indoor return air after heat exchange with the heat exchange core and discharged outdoors. In this way, the influence of motor heating on indoor temperature can be avoided during cooling, so as to improve heat exchange efficiency. Therefore, the fresh air fan provided by the present invention can be used for both winter heating and summer cooling, and the structure is reasonably arranged. In the fresh air fan provided by the present invention, the gas affected by the heat generated by the motor operation no longer passes through the heat exchange core, and will not affect the fresh air.

[0061] The present invention also provides a control method for the fresh air fan, the basic steps of which are:

[0062] When it is detected that the indoor temperature is lower than the outdoor temperature, the system is in a cooling state. At this time, the fresh air valve is completely closed, and the return air valve is completely opened to discharge the heat of the motor in the independent air duct to the outside through the return air outlet duct.

[0063] When it is detected that the indoor temperature is greater than the outdoor temperature, the heating state is in place, at which point the return air valve is completely closed, the fresh air valve is completely opened, and the heat of the motor in the independent air duct is sent into the room through the fresh air outlet duct.

[0064] When the indoor and outdoor temperature difference is small, fully opening the fresh air valve may cause the motor to send too much heat into the room, making the indoor temperature too high. Therefore, it is also necessary to test and compare:

[0065] If it is detected that the temperature difference between the fresh air outlet temperature and the indoor temperature is greater than the preset condition, the opening of the fresh air valve is dynamically adjusted according to the temperature difference between the fresh air outlet temperature and the indoor temperature until the temperature difference between the fresh air outlet temperature and the indoor temperature meets the preset condition.

[0066] The embodiment of the control method of the fresh air fan provided by the present invention has the following specific steps (please refer to Figures 9 to 13 ):

[0067] The preset temperature difference between the fresh air outlet temperature and the indoor temperature is △T = 0.5°C. Within this range, the fresh air outlet temperature can be considered to be approximately equal to the indoor temperature. When the initial indoor temperature is detected to be Tn = 25°C; the outdoor temperature is Tw = 10°C; the fresh air outlet temperature is Tx = 28°C.

[0068] 1. If Tn>Tw, it means the room is in heating state. Fig. 9 , Fig.10 As shown, the return air valve 12 is closed, the fresh air valve 11 is opened, and the fresh air return duct is connected to the independent duct. Under the action of the fresh air fan 6, the airflow entering the independent duct sends the heat generated by all motors into the fresh air outlet duct, and is mixed with the fresh air and input into the room.

[0069] If Tn<Tw is detected, it means that the room is in cooling state. Then the return air valve is opened, the fresh air valve is closed, the heat generated by the motor in the independent air duct is discharged to the outside, and the temperature change is continuously monitored.

[0070] 2. When it is judged that Tn>Tw, calculate and compare: Tx-Tn=3℃>0.5℃,

[0071] That is, the condition of Tx-Tn>+△T is met, indicating that the indoor temperature Tn is relatively high, and the opening of the fresh air valve 11 is controlled to be reduced by 1 gear to reduce the heat generated by the motor input into the room. At the same time, the return air valve 12 will be opened to 1 gear accordingly, and a small amount of motor heat in the independent air duct will be discharged to the outside through the return air outlet duct. Since the indoor temperature does not need to be raised temporarily, discharging a small amount of motor heat will not affect the fresh air fan to maintain the heating state.

[0072] If the calculated temperature difference is Tx-Tn<+△T, continue to monitor the temperature change and compare.

[0073] 3. When the detected fresh air outlet temperature drops to Tx = 26°C, calculate and compare:

[0074] Tx-Tn=1℃>-0.5℃, that is, the condition of Tx-Tn<-△T is not met. At this time:

[0075] It is necessary to first compare the absolute value of the difference between the fresh air outlet temperature and the indoor temperature with the preset temperature difference value: |Tx-Tn|=1℃>0.5℃, that is, the condition of |Tx-Tn|<△T is not met, and the opening of the fresh air valve 11 is controlled to be reduced by one level to further reduce the heat generated by the motor input into the room.

[0076] If the outdoor temperature fluctuates and becomes Tw=9℃, and the fresh air outlet temperature becomes Tx=25.4℃, calculate and compare: |Tx-Tn|=0.4℃<0.5℃, that is, the condition of |Tx-Tn|<△T is met, then the opening of the fresh air valve remains unchanged, and the temperature changes continue to be detected and compared.

[0077] 4. When the fresh air outlet temperature is further detected to be Tx = 24°C, the calculation and comparison are:

[0078] Tx-Tn=-1℃<-0.5℃, that is, the condition of Tx-Tn<-△T is met, then the opening of the fresh air valve is increased by 1 level, the heat generated by the motor input into the room is increased, the indoor temperature is raised, and the temperature changes are continued to be monitored and compared.

[0079] The control method of the fresh air fan provided by the present invention has the basic principle of adjusting the flow direction of the heat generated by the motor operation according to the cooling or heating demand of the fresh air fan. That is, the temperature values ​​detected in real time are compared. According to different comparison results, the corresponding air valve is controlled to be opened and closed, so that the heat generated by the motor in the independent air duct is transported to a reasonable place, so as to improve the heat exchange efficiency of the fresh air fan. The control method has relatively fine data, and the adjustment of the air valve switch is timely and reasonable. The opening of the air valve can also be adjusted in stages according to the indoor temperature to fine-tune the indoor temperature in real time.

[0080] It should be noted that the terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. Unless otherwise specifically stated, the relative arrangement of the technical features and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of protection of the present invention.

[0081] This specification does not describe any technology, method or device known to ordinary technicians in the relevant field.

[0082] Detailed discussion, but in appropriate cases, the technology, method and device should be considered as part of this specification. Any specific value in this specification should be interpreted as only exemplary and not limiting the present invention.

[0083] For the convenience of description, the terms describing the position used in the specification, such as "above...", "to the left of...", "in front of...", etc., are only used to describe the spatial position relationship between a certain component and other components of the embodiment shown in the figure. When the position of the component is different, the relative position will change. Therefore, the position relationship of the embodiment of the drawing should not limit the present invention.

[0084] The above description is only a specific implementation of the present invention. It should be pointed out that any modification, equivalent substitution and change made within the spirit and framework of the present invention should be included in the protection scope of the present invention.

Claims

1. A damper device, characterized in that: It includes an air duct partition, a fresh air valve and a return air valve respectively arranged on both sides of the air duct partition, and a motor arranged on the air duct partition panel. The two ends of the motor shaft extend out and are respectively connected to the fresh air valve and the return air valve; when the motor rotates forwards and reversely, it can simultaneously drive one of the two air valves to open and the other air valve to close.

2. The air valve device according to claim 1, characterized in that: The fresh air valve and the motor are arranged on the same side of the air duct partition, and the return air valve is arranged on the other side of the air duct partition.

3. The air valve device according to claim 1, characterized in that: The air valve includes a base arranged on the air duct partition, a bracket hinged to the base at one end, and a baffle connected to the other end of the bracket; the motor drives the bracket to rotate so that the baffle can close or open the air duct hole arranged on the air duct partition.

4. The air valve device according to claim 3, characterized in that: Axial holes are provided on both sides of the base, and a mounting opening is provided around one of the axis holes; a hinge shaft is provided at one end of the bracket, and both ends of the hinge shaft are arranged in the axis holes on both sides of the base, so that the bracket and the base form a hinge connection.

5. The air valve device according to claim 4, characterized in that: The hinge shaft is a hollow structure, the inner hole is an oblong hole, and the motor shaft end is an oblong structure adapted to the oblong hole of the hinge shaft; when the motor shaft is inserted into the oblong hole of the hinge shaft, the motor can drive the bracket to rotate relative to the base.

6. The air valve device according to claim 5, characterized in that: The oblong hole of the hinge shaft is a through hole or an oblong hole arranged at one end.

7. The air valve device according to claim 3, characterized in that: The surfaces of the baffle plate and the air duct partition plate facing each other are each provided with a layer of sealing gasket, and when the air valve is closed, the two facing sealing gaskets fit tightly.

8. The air valve device according to claim 1, characterized in that: The opening of the air valve is divided into several gears, and the motor is a stepping motor, which controls and adjusts the opening of the air valve.

9. A fresh air fan having a damper device according to any one of claims 1 to 8, comprising a fresh air fan and a fresh air motor, a return air fan and a return air motor, characterized in that: The fresh air fan and return air fan are respectively arranged in the respective air outlet ducts of the fresh air fan, and the fresh air motor and return air motor are located in an independent air duct of the fresh air fan. The air valve device is provided between the independent air duct and the fresh air fan and the return air fan. The fresh air valve of the air valve device corresponds to the fresh air outlet duct, and the return air valve is located in the return air outlet duct; when the motor rotates forward and reverse, it can drive one of the two air valves to open, so that the independent air duct is connected to the corresponding opened air outlet duct, and the other air valve is closed at the same time.

10. A control method for a fresh air blower as claimed in claim 9, comprising the following steps: When it is detected that the indoor temperature is lower than the outdoor temperature, the system is in a cooling state. At this time, the fresh air valve is completely closed, and the return air valve is completely opened to discharge the heat of the motor in the independent air duct to the outside through the return air outlet duct. When it is detected that the indoor temperature is greater than the outdoor temperature, the heating state is in progress, at which time the return air valve is completely closed, the fresh air valve is completely opened, and the heat of the motor in the independent air duct is sent into the room through the fresh air outlet duct; When it is detected that the temperature difference between the fresh air outlet temperature and the indoor temperature is greater than a preset condition, the opening of the fresh air valve is dynamically adjusted according to the temperature difference between the fresh air outlet temperature and the indoor temperature until the temperature difference between the fresh air outlet temperature and the indoor temperature meets the preset condition.

11. The control method according to claim 10, wherein the specific control steps are: The temperature difference between the fresh air outlet temperature and the indoor temperature is preset to be △T, and the initial indoor temperature is detected to be Tn; the outdoor temperature is Tw; and the fresh air outlet temperature is Tx; When it is detected that Tn<Tw, indicating that the room is in cooling state, the return air valve is fully opened, the fresh air valve is fully closed, the heat of the motor in the independent air duct is discharged to the outside, and the temperature change is continuously monitored; When Tn>Tw is detected, indicating that the room is in heating state, the return air valve is fully closed, the fresh air valve is fully opened, and the heat of the motor in the independent air duct is input into the room; When it is detected that Tn>Tw, if the calculation comparison is: Tx-Tn>△T, that is, the condition of Tx-Tn>+△T is met, it means that the indoor temperature is high, and the opening of the fresh air valve is adjusted to reduce 1 level to reduce the heat input into the indoor motor; If the calculated temperature difference is Tx-Tn<+△T, continue to monitor the temperature change and compare; When the detected fresh air outlet temperature Tx becomes low, if the calculation comparison: Tx-Tn=>△T, that is, the condition of Tx-Tn<-△T is not met, then it is necessary to first compare the absolute value of the difference between the fresh air outlet temperature and the indoor temperature with the preset temperature difference value: if |Tx-Tn|>△T, that is, the condition of |Tx-Tn|<△T is not met, adjust the opening of the fresh air valve and reduce it by one level to further reduce the motor heat input into the room; If the outdoor temperature Tw is detected to be lower, and the measured fresh air outlet temperature Tx is lowered again, if the calculation and comparison: |Tx-Tn|<△T, that is, the condition of |Tx-Tn|<△T is met, the opening of the fresh air valve remains unchanged, and the temperature change is continued to be detected and compared; When further detection shows that the fresh air outlet temperature Tx becomes lower, if the calculation and comparison shows that: Tx-Tn<-△T, that is, the condition of Tx-Tn<-△T is met, the opening of the fresh air valve is increased by 1 level, the motor heat input into the room is increased, and the temperature changes are continued to be monitored and compared.

Images