KR102007880B1 - Variable air volume regulation device and control method of this - Google Patents

Abstract

The present invention relates to a variable air volume adjustment device and a control method thereof, wherein the variable air volume adjustment device is required to convert a special air conditioning system which has been designed for a pressure system of medium pressure or higher into a low pressure system. To this end, the variable air volume adjustment device comprises: a hollow casing unit wherein a constricted portion getting narrower than a diameter of an inlet formed at a front end of the hollow casing unit and then getting wider to a diameter of an outlet formed at a rear end thereof connects the inlet to the outlet; an opening adjustment unit rotationally coupled to the casing unit to adjust the opening degree of a venturi portion; and a static pressure sensing unit sensing wind pressure and air volume of gas passing through the casing unit. Moreover, the opening adjustment unit comprises: an inclined plate portion rotationally disposed in the venturi portion; an inclined shaft portion forming the center of rotation of the inclined plate portion in the longitudinal center of the venturi portion; and an opening adjustment portion normally rotating the inclined plate portion based on the inclined shaft portion to adjust the opening degree of the venturi portion.

Description

VARIABLE AIR VOLUME REGULATION DEVICE AND CONTROL METHOD OF THIS

The present invention relates to a variable air volume control device and a control method thereof, and more particularly, to a variable air volume control device and a control method thereof required for converting a special air conditioning system, which has been designed as a medium pressure or higher pressure system, to a low pressure system. will be.

Typically, a laboratory built requires sophisticated airflow control to meet its R & D goals. At the same time, it is paying attention to the possibility of saving the energy required for the transportation power by increasing the simultaneous use of the device to reduce the initial investment cost.

Recently, air supplied to air conditioning and special laboratories is supplied to the room through a variable air volume controller.

The conventional variable air volume regulator cannot draw air more effectively and uniformly, and thus does not supply comfortable air according to a change in room temperature, and consumes more energy than necessary.

Accordingly, there is an increasing demand for system review and development for the adoption of a variable air volume control device capable of exhibiting air volume control performance at low pressure while reducing the air volume control area.

Republic of Korea Patent Publication No. 10-0911156 (Name of the invention: Variable air flow regulator, 2009. 08. 06. notification)

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable air volume adjusting device and a control method thereof required to convert a special air conditioning system, which has been designed as a medium pressure or higher pressure system, to a low pressure system.

According to a preferred embodiment for achieving the above object of the present invention, the variable air volume control device according to the present invention is smaller than the diameter of the inlet formed in the front end of the narrower portion is larger than the diameter of the outlet formed in the rear end and the A hollow casing unit connecting the outlets; An opening degree adjusting unit rotatably coupled to the casing unit to adjust an opening degree of the venturi part; And a static pressure sensing unit for sensing the air pressure or the air volume of the gas passing through the casing unit, wherein the opening control unit includes: an inclined plate unit rotatably provided in the venturi unit; An inclined shaft portion forming a center of rotation of the inclined plate portion at a central portion in the longitudinal direction of the venturi portion; And an opening degree adjusting unit configured to forward and backward rotate the inclined plate part about the inclined shaft part to adjust the opening degree of the venturi part.

Here, the constricted portion, Venturi inlet portion forming a reduced inclination from the inlet to the first inclination angle; A venturi inclination part that forms a reduced inclination from the venturi inlet part to a second inclination angle; And a venturi dispersion unit extending inclined from the venturi inclined portion to a third inclination angle.

Here, the first inclination angle is larger than the third inclination angle, and the third inclination angle is smaller than the second inclination angle.

Here, the static pressure sensing unit is provided at the inlet and the outlet, respectively.

Here, the positive pressure sensing unit, at least one sensing rod provided in the casing unit to cross or perpendicular to the moving direction of the gas; A plurality of sensing ports disposed in the lengthwise direction of the sensing rod to sense the wind pressure or the air volume of the gas passing through the casing unit; And a transmitter for transmitting sensing information sensed by the sensing port, wherein the sensing port faces the exit side.

The control method of the variable air volume control device according to the present invention comprises the air flow rate setting step of setting the air pressure or air volume of the gas to be set; A wind volume comparing step of comparing the set value set through the air volume setting step with a current set range; A rotation amount calculation step of calculating a rotation amount of the inclined plate part according to a difference between the setting value and the setting range when the setting value is out of the setting range; And an opening degree control step of forward and reverse rotation of the inclination plate part according to the rotation amount of the inclination plate part calculated through the rotation amount calculation step.

The control method of the variable air volume control apparatus according to the present invention further includes a fine adjustment step of finely forward and backward rotation of the inclined plate part in response to the set value when the set value is included in the set range.

According to the variable air volume control device and the control method thereof according to the present invention, it is possible to switch the special air conditioning system designed to a pressure system of medium pressure or more to a low pressure system.

In particular, the present invention is applied to the damper-type opening control unit in the venturi type casing unit, thereby ensuring the function of the required air flow detection and control even at a lower pressure in the duct than the conventional air flow control device using a cone It is possible to improve the accuracy and reliability, to automatically adjust the amount of air blowout, and to respond more precisely than before. More specifically, the present invention is operated in a damper venturi method in response to the pressure-independent automatic air volume change to automatically adjust the air blowing amount while precisely responding to the control of the indoor air quality, quantity, and temperature in response to low pressure changes in the duct. It can be adjusted with the low pressure sensitive pressure control cross-sectional area.

In addition, the present invention is applied to the damper type opening adjustment unit in the venturi type casing unit, the linear length (straight pipe duct section) of the connection duct for the installation of the adjusting device 1 to 1.5 times the diameter of the connection duct 3 times It is possible to minimize the installation space and the area of the regulator by reducing the level, and the high pressure system can respond quickly and easily to low pressure situations, and provide a driver-centered system such as situation identification and reporting.

In addition, the present invention is applied to the damper type opening adjustment unit in the venturi type casing unit, it is possible to prevent the generation of vortex in the duct, it is possible to improve the accuracy of the air flow measurement.

In addition, the present invention is applied to the damper type opening adjustment unit in the venturi type casing unit, it is possible to reduce the pressure drop between the inlet and the outlet of the casing unit, compared to the cone type opening adjustment unit, the pressure in the duct is increased And the energy consumption of the circulation fan in the duct can be minimized.

In addition, the present invention is provided by the inlet and the outlet of the casing unit, respectively, so that the pressure can be calculated twice at different positions, it is possible to reduce the air flow detection error.

In addition, the present invention can respond to the demand for air volume change accurately and continuously for the air moving at a low pressure inside the duct through the limitation of the sensing port in the static pressure sensing unit. In other words, the present invention can accurately detect a rapid change in the air flow even at low pressure in the duct through the limitation of the sensing port in the static pressure sensing unit, and improve the accuracy of pressure sensing and at the same time significantly increase the reliability of the device performance. It can increase.

In addition, the present invention can prevent the clogging of the sensing port due to the accumulation of foreign matter such as dust or suspended matter in the duct through the limitation of the sensing port in the static pressure sensing unit.

In addition, the present invention, when controlling the opening and closing angle of the inclined plate portion through the inclined plate portion in the opening control unit, it is possible to reduce the driving time of the inclined plate portion, reduce the angle of attack and vertical lift in the inclined plate portion, mechanical load applied to the opening degree control unit It is possible to reduce the flow rate and to reduce the friction noise of the air stream by smoothing the flow of the air stream.

1 is a view showing a variable air volume control device according to an embodiment of the present invention.
Figure 2 is a block diagram showing a control unit in the variable air volume control apparatus according to an embodiment of the present invention.
3 is a view showing an operating state of the opening degree control unit in the variable air volume control device according to an embodiment of the present invention.
4 is a flowchart illustrating a control method of a variable air volume adjusting device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a variable air volume control device and a control method thereof according to the present invention. At this time, the present invention is not limited or limited by the embodiment. In addition, in describing the present invention, a detailed description of known functions or configurations may be omitted to clarify the gist of the present invention.

1 to 3, the variable air volume control device according to an embodiment of the present invention includes a casing unit 10, an opening degree control unit 20, and a static pressure sensing unit, and includes a control unit 50. It may further include.

According to the conventional opening degree control unit applied in a damper manner in the casing unit of the straight pipe type, when installing the conventional opening degree control unit in the duct, a straight pipe duct section is required forward. At this time, since the straight duct section requires at least three times the diameter of the duct, the installation area is widened. Here, when the installation area is reduced due to the limitation of the installation space, the straight duct section is reduced, vortices are generated at the duct connection part, and due to the vortex, the wind pressure or air volume of the gas cannot be detected at the inlet of the casing unit, or a detection error is caused. There is a problem that occurs.

In addition, according to the conventional opening degree adjustment unit to which the damping method is applied in the straight pipe type casing unit, since the inclined plate portion shows a state perpendicular to the direction of movement of the gas in the blocked portion of the casing unit, the driving time during the rotation operation of the inclined plate portion This has a long problem. In addition, when the inclined plate portion rotates from 10 degrees to 30 degrees, the angle of attack and vertical lift are increased in a state in which the opening gap between the inclined plate portion and the casing unit is reduced, thereby increasing the mechanical load applied to the mechanism for rotating the inclined plate portion and narrowing the space. When passing, there is a problem that the frictional noise of the airflow increases as the passage speed of the airflow increases.

In addition, according to the conventional opening degree control unit in which the cone type is applied to the venturi type casing unit, the pressure drop between the inlet and the outlet is increased based on the cone in response to the air volume sensing area, so that the pressure level of the gas passing through the adjusting device must be increased. And, the energy consumption of the fan for the movement of the gas has a problem that increases.

In addition, according to the conventional static pressure sensing unit, since the sensing port is arranged to face the inlet side of the casing unit or toward the inner wall of the casing unit, after the gas passes through the static pressure sensing unit for a predetermined time, foreign matter contained in the gas (dust) Or suspended matter) may block the sensing port and thus may not detect the wind pressure or air volume of the gas at the sensing port, or a detection error may occur.

Therefore, in one embodiment of the present invention, the variable air volume regulating device defines a coupling relationship between the venturi type casing unit 10 and the damper type opening control unit 20. Further, in one embodiment of the present invention, the variable air volume adjusting device defines a coupling structure of the static pressure sensing unit. Then, the variable air volume control apparatus according to an embodiment of the present invention can convert the special air conditioning system, which has been designed as a pressure system of medium pressure or higher, to a low pressure system.

The casing unit 10 shows a hollow tubular shape. The casing unit 10 has an inlet 111 formed at the front end, an outlet 121 is formed at the rear end, and a concave portion formed between the inlet 111 and the outlet 121 is the inlet 111 and the outlet 121. To be connected. The constricted portion shows a shape that is smaller than the diameter of the inlet 111 and becomes larger than the diameter of the outlet 121.

In more detail, the casing unit 10 is provided with a hollow first straight portion 11 provided with an inlet 111, a hollow second straight portion 12 provided with an outlet 121, and a concave portion. It may include a hollow venturi portion (13). The venturi part 13 connects the first straight part 11 and the second straight part 12.

Here, the constricted portion may include the venturi inlet 131, the venturi tilting part 132, and the venturi dispersion unit 133. The venturi inlet 131 forms a reduced inclination from the inlet 111 to the first inclination angle b1. The venturi inlet 131 may have a straight cross section or an arc cross section. The diameter of the venturi inlet 131 is gradually smaller than the diameter of the inlet 111 along the direction of movement of the gas. Venturi inclined portion 132 is inclined to the second inclination angle (b2) from the rear end of the venturi inlet 131. Venturi inclined portion 132 may exhibit a straight cross section or an arc-shaped cross section. The diameter of the venturi inclined portion 132 is gradually smaller than the diameter of the rear end of the venturi inlet portion 131 along the gas moving direction. The venturi dispersion unit 133 forms an inclined extension to the third inclination angle b3 from the rear end of the venturi inclination unit 132. The venturi dispersion unit 133 may have a straight cross section or an arc cross section. The diameter of the venturi dispersion portion 133 gradually increases from the rear end of the venturi inclined portion 132 toward the outlet 121.

Here, the first inclination angle b1 is greater than the third inclination angle b3, and the third inclination angle b3 is greater than the second inclination angle b2. In addition, the length of the venturi dispersing unit 133 may be defined as the sum of the length of the venturi inlet unit 131 and the length of the venturi inclining unit 132 based on the movement direction of the gas. Through the limitation of the narrowed portion, it is possible to suppress or prevent the generation of vortices in the gas passing through the venturi part 13, and to stabilize the flow of the gas.

The opening degree control unit 20 is rotatably coupled to the casing unit 10. The opening degree control unit 20 may adjust the air flow rate of the gas passing through the casing unit 10 by adjusting the opening degree of the concave portion in the venturi part 13. The opening degree adjusting unit 20 may include an inclined plate portion 21, an inclined shaft portion 22, and an opening degree adjusting portion 23.

The inclined plate portion 21 is rotatably provided at the concave portion of the venturi portion 13. In the state in which the concave part of the venturi part 13 is blocked, the inclined plate part 21 corresponds to the shape of the concave part of the venturi part 13 so that the edge is in close contact with the concave part of the venturi part 13.

The inclined shaft portion 22 forms a center of rotation of the inclined plate portion 21. The inclined shaft portion 22 may be provided at the longitudinal center of the venturi portion 13. In other words, the inclined shaft part 22 may be formed at a portion crossing the length direction of the venturi part 13 at the boundary between the venturi tilting part 132 and the venturi dispersion part 133. Then, it is possible to select whether or not to deliver the gas at the portion where the maximum pressure is generated in the direction of gas movement, and to minimize the pressure loss in the gas delivery process.

The opening degree adjustment unit 23 rotates the inclination plate part 21 about the inclination shaft part 22 forward and backward. The opening degree adjusting unit 23 may adjust the opening degree of the concave portion of the venturi part 13 according to the rotation amount of the inclined plate part 21.

In the opening control unit 20, the inclined plate portion 21 forms a predetermined blocking inclination angle (a) in a blocked state of the venturi portion (13). The inclined plate portion 21 is provided to be inclined at a predetermined blocking inclination angle (a) based on the moving direction of the gas in a blocked state of the venturi portion 13 of the casing unit 10. For example, the preset blockage tilt angle a may be set to 60 degrees. As another example, the preset blocking angle a may be set to 45 degrees. As another example, the preset blocking angle a may be set to 90 degrees. As a result, the predetermined blocking angle a is set between 45 degrees and 90 degrees, between 45 degrees and 60 degrees, and between 60 degrees and 90 degrees, thereby reducing the mechanical load acting on the inclined plate portion 21.

In particular, since the inclined shaft portion 22 is provided at the boundary between the venturi tilting portion 132 and the venturi scattering portion 133, the inclined plate portion 21 is not operated in a straight pipe portion as in the prior art, It works in the narrow part. Therefore, the inclined plate portion 21 is provided at the concave portion of the venturi portion 13, so that even if the preset oblique inclination angle a is 90 degrees, the pressure change at the concave portion of the venturi portion 13 can be sufficiently coped with. Since the gas diffusion effect is caused by the two inclination angles b2 and the third inclination angle b3, the reaction angle is changed when the concave portion of the venturi portion 13 is opened in a state where the preset oblique inclination angle a is 90 degrees. It can have the effect of reducing the vertical lift while reducing, smoothing the flow of airflow and less noise. In other words, the above-described preset oblique inclination angle (a) is applied to the inclined plate portion 21 in the narrow portion of the venturi portion 13, thereby reducing the reaction angle compared to the inclined plate portion 21 formed in the straight pipe portion. The lift can be reduced.

The static pressure sensing unit detects the wind pressure or air volume of the gas passing through the casing unit 10. The static pressure sensing unit may monitor the wind pressure or the air volume change of the gas in real time as it is provided at the inlet 111 and the outlet 121 of the casing unit 10, respectively.

The static pressure sensing unit includes at least one sensing rod provided inside the casing unit 10 so as to intersect or be perpendicular to the moving direction of the gas, and a sensing rod for sensing the wind pressure or air volume of the gas passing through the casing unit 10. The sensing port may include a plurality of sensing ports disposed in the longitudinal direction, and a transmitter for transmitting sensing information sensed by the sensing port.

For example, the static pressure sensing unit includes a first static pressure sensing unit 30 provided at the inlet 111 of the casing unit 10, and a second static pressure sensing unit 40 provided at the outlet 121 of the casing unit 10. ). The first static pressure sensing unit 30 includes at least one first rod 31 provided at the inlet 111 of the casing unit 10 so as to intersect or perpendicular to the direction of movement of the gas, and the inlet of the casing unit 10. Sensing information detected by the plurality of first sensing ports 311 and the first sensing ports 311 which are disposed in the longitudinal direction of the first rod 31 to sense the wind pressure or air volume of the gas passing through the 111. It may include a first transmitter 32 for transmitting the. In addition, the second static pressure detecting unit 40 includes at least one second rod 41 and the casing unit 10 provided at the outlet 121 of the casing unit 10 so as to intersect or perpendicular to the moving direction of the gas. A plurality of second sensing port 411 and the second sensing port 411 is disposed in the longitudinal direction of the second rod 41 to detect the wind pressure or air flow rate of the gas passing through the outlet 121 of the It may include a second transmitter 42 for transmitting the sensing information.

As another example, the static pressure sensing unit includes at least one first rod 31 provided at the inlet 111 of the casing unit 10 so as to intersect or perpendicular to the direction of movement of the gas, and the inlet 111 of the casing unit 10. A plurality of first sensing ports 311 disposed in the longitudinal direction of the first rod 31 to sense the wind pressure or the amount of air passing through the casing unit, and the casing unit 10 so as to intersect or perpendicular to the movement direction of the gas. At least one second rod 41 provided at the outlet 121 of the) and the length of the second rod 41 to detect the wind pressure or air volume of the gas passing through the outlet 121 of the casing unit 10 The first and second sensing ports 311, which are provided at the plurality of second sensing ports 411 arranged in the direction, the inlet 111 of the casing unit 10, and the outlet 121 of the casing unit 10, respectively. It may include one transmitter for transmitting the sensing information sensed in 411.

Here, since the sensing port, the first sensing port 311 and the second sensing port 411 are disposed to face the outlet 121 of the casing unit 10, each sensing port is prevented from being blocked by foreign substances. can do.

The control unit 50 controls the operation of the opening degree adjustment unit 20 based on the sensing information of the static pressure sensing unit to adjust the opening degree in the concave portion of the venturi part 13, thereby passing the gas passing through the casing unit 10. You can adjust the wind pressure or air volume.

The control unit 50 includes a air volume input unit 51 for setting the air pressure or air volume of the gas to be set, a air volume comparator 52 for comparing the current setting range with a set value set through the air volume input unit 51, As a result of the comparison of the air volume comparing unit 52, when the set value is out of the setting range, the rotation amount calculating unit 53 for calculating the amount of rotation of the inclined plate portion 21 according to the difference between the setting value and the setting range, and The opening degree control part 54 which controls the opening degree adjustment part 23 of the opening degree adjustment unit 20 so that the inclination plate part 21 rotates forward and backward according to the rotation amount of the inclination plate part 21 computed by the whole quantity calculation part 53 is May be included.

In addition, when the set value is included in the setting range as a result of the comparison of the air volume comparing unit 52, the control unit 50 includes the opening degree adjusting unit 20 so that the inclined plate portion 21 is minutely reversed and rotated in response to the set value. Fine adjustment unit 55 for controlling the opening degree adjustment unit 23 of the may be further included. If the output value of the gas passing through the casing unit 10 is smaller than the set value within the setting range, the fine adjusting unit 55 rotates the inclined plate portion 21 forward to increase the air pressure or air volume of the gas, thereby expanding the opening degree. When the output value of the gas that has passed through the casing unit 10 within the set range is larger than the set value, the degree of opening may be reduced by rotating the inclined plate 21 in order to reduce the wind pressure or air volume of the gas. And the control unit 50 monitors the input value of the gas flowing into the casing unit 10 and the output value of the gas passing through the casing unit 10 and the current set range, and whether the output value and the set value of the gas match the You can check it.

Now, with reference to Figure 4 will be described a control method of a variable air volume control device according to an embodiment of the present invention.

The control method of the variable air volume control device according to an embodiment of the present invention is a method of controlling the opening degree of the narrowed portion in the venturi by controlling the variable air volume control device according to an embodiment of the present invention.

The control method of the variable air volume control device according to an embodiment of the present invention includes a wind volume setting step (S2), a wind volume comparison step (S3), a rotation amount calculation step (S4), and an opening degree control step (S5) Further comprising a fine adjustment step (S6), and further comprises a flow rate checking step (S7), may further include a wind volume monitoring step (S1).

Air volume setting step (S2) sets the air pressure or air volume of the gas to be set. In the air volume setting step S2, the air pressure or the air volume of the gas may be set as a set value input through the air volume input unit 51.

The air volume comparison step S3 compares the set value set through the air volume setting step S2 with the current setting range. In the air volume comparing step S3, the air volume comparing unit 52 may compare whether the set value is included in the current setting range.

The rotation amount calculating step S4 calculates the rotation amount of the inclined plate part 21 according to the difference between the setting value and the setting range when the set value is out of the setting range as a result of the comparison of the airflow comparing step S3. In the rotation amount calculation step S4, the rotation amount of the inclined plate part 21 may be calculated through the rotation amount calculation unit 53.

The opening degree control step S5 rotates the inclination plate part 21 forward and backward according to the rotation amount of the inclination plate part 21 calculated in the rotation amount calculation step S4. In the opening degree control step S5, by operating the opening degree adjusting part 23 through the opening degree controlling part, the inclined plate part 21 can be rotated forward and backward.

In the fine adjustment step S6, when the set value is included in the set range as a result of the comparison of the air volume comparison step S3, the inclination plate part 21 is minutely reversed and rotated in response to the set value. In the fine adjusting step S6, the inclination plate part 21 may be minutely reversed and rotated by operating the opening degree adjusting unit 23 through the fine adjusting unit 55. For example, if the output value of the gas passing through the casing unit 10 within the set range is smaller than the set value, the fine adjustment unit 55 in the fine adjustment step (S6) to increase the air pressure or air volume of the gas inclined plate portion ( 21) can be rotated forward to expand the opening degree. As another example, if the output value of the gas passing through the casing unit 10 within the setting range is larger than the set value, the fine adjustment unit 55 in the fine adjustment step (S6) to reduce the wind pressure or air volume of the gas inclined plate portion 21 ), The degree of opening can be reduced by reverse rotation.

In the air flow rate checking step S7, when the output value of the gas passing through the casing unit 10 and the set value match, the rotation of the inclined plate part 21 is stopped. The air flow rate checking step (S7) may determine whether the output value of the gas coincides with the setting value through the control unit 50, and when the output value and the setting value of the gas coincide, the rotation of the inclined plate part 21 may be stopped.

In the air flow monitoring step S1, the air pressure or air volume of the gas passing through the inlet 111 of the casing unit 10 is determined based on the sensing information transmitted from the static pressure sensing unit to determine the input value of the gas. The output value of the gas is determined by calculating the wind pressure or air volume of the gas passing through the outlet 121 of the casing unit 10 based on the sensing information transmitted from the present invention, and the current setting range is determined by applying the error range of the output value. In addition to storing the gas input value, the gas output value, and the current set range, it is also displayed for user identification.

According to the above-described variable air volume control device and a control method thereof, it is possible to convert a special air conditioning system, which has been designed as a pressure system of medium pressure or higher, to a low pressure system.

In particular, by applying the damper type opening degree control unit 20 in the venturi type casing unit 10, it is possible to detect and control the air volume basically required even at a lower level of pressure in the duct than the air flow control device using a conventional cone. It can guarantee the function, improve the accuracy and reliability, can automatically adjust the air blowing amount, and can respond more precisely than before.

More specifically, it is operated by damper venturi method in response to pressure-independent automatic air volume change, and it can automatically adjust the air blowing amount while precisely responding to the control of air quality, quantity, and temperature in the building for low pressure change in the duct. The low pressure sensitive pressure control cross-sectional area can be reduced.

In addition, the damper type opening adjustment unit 20 is applied to the venturi type casing unit 10 so that the linear length (straight pipe duct section) of the connection duct for installation of the adjusting device is 1 to 3 times the diameter of the connection duct. It is possible to minimize the installation space and the area of the control device by reducing the level from 1.5 to 1.5 times, and the high pressure system can easily and quickly respond to low pressure situations, and provide a driver-centered system such as situation identification and reporting.

In addition, by applying the damper type opening degree control unit 20 in the venturi type casing unit 10, it is possible to prevent the generation of vortex in the duct, and to improve the accuracy of the air volume measurement.

In addition, the damper type opening adjustment unit 20 is applied to the venturi type casing unit 10, so that the inlet 111 and the outlet 121 of the casing unit 10 are compared with the cone type opening adjustment unit 20. The pressure drop in between can be reduced, the pressure in the duct can be prevented from increasing, and the energy consumption of the circulation fan in the duct can be minimized.

In addition, since the positive pressure detecting unit is provided at the inlet 111 and the outlet 121 of the casing unit 10, respectively, the pressure can be calculated twice at different positions, and the air volume detection error can be reduced.

In addition, through the limitation of the sensing port in the static pressure sensing unit, it is possible to accurately and continuously respond to the demand for air volume change for the air moving at a low pressure inside the duct.

In other words, by limiting the sensing port in the static pressure sensing unit, it is possible to accurately detect rapid air flow changes even at low pressure in the duct, and improve the accuracy of the pressure sensing and increase the reliability of the device significantly. .

In addition, through the limitation of the sensing port in the static pressure sensing unit, it is possible to prevent the clogging of the sensing port due to the accumulation of foreign matter such as dust or suspended matter in the duct.

In addition, when controlling the opening and closing angle of the inclined plate portion 21 through the inclined plate portion in the opening adjustment unit 20, it is possible to reduce the driving time of the inclined plate portion 21, and to reduce the angle of attack and vertical lift in the inclined plate portion 21 It can be, to reduce the mechanical load applied to the opening degree control unit 20, to reduce the friction noise of the airflow by smoothing the flow of airflow.

Although the preferred embodiments of the present invention have been described with reference to the drawings as described above, those skilled in the art can variously change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Can be modified or changed.

10: casing unit 11: first straight portion 111: inlet
12: second intuitive portion 121: exit 13: venturi portion
131: Venturi inlet 132: Venturi Inclination 133: Venturi Dispersion
20: opening degree control unit 21: inclined plate portion 22: inclined shaft portion
23: opening degree control unit 30: first static pressure detection unit 31: first rod
311: 1st detection zone 32: 1st transmitter 40: 2nd static pressure detection unit
41: second rod 411: second detection zone 42: second transmitter
50: control unit 51: air volume input unit 52: air volume comparison unit
53: rotation amount calculation unit 54: opening degree control unit 55: fine adjustment unit
b1: first inclination angle b2: second inclination angle b3: third inclination angle
a: blockage angle
S1: Airflow monitoring step S2: Airflow setting step S3: Airflow comparison step
S4: Rotation amount calculation step S5: Opening degree control step S6: Fine adjustment step
S7: Air flow confirmation step

Claims (7)

A hollow casing unit connecting the inlet and the outlet with a venturi part having a concave portion that is smaller than the diameter of the inlet formed at the front end and is increased to the diameter of the outlet formed at the rear end;
An opening degree adjusting unit rotatably coupled to the casing unit to adjust an opening degree of the venturi part; And
And a static pressure sensing unit for sensing a wind pressure or a wind volume of the gas passing through the casing unit.
The narrowed portion,
A venturi inlet configured to be inclined at a first inclination angle from the inlet;
A venturi inclination part that forms a reduced inclination from the venturi inlet part to a second inclination angle; And
It includes; Venturi dispersion portion forming an inclined expansion to the third inclination angle from the Venturi inclined portion,
The first inclination angle is greater than the third inclination angle,
The third inclination angle is smaller than the second inclination angle,
The opening degree control unit,
An inclined plate portion rotatably provided in the venturi portion;
An inclined shaft portion forming a center of rotation of the inclined plate portion at a longitudinal center portion of the venturi portion or at a boundary portion between the venturi slope portion and the venturi dispersion portion; And
And an opening degree adjusting unit configured to forward and backward rotate the inclined plate part about the inclined shaft part to adjust the opening degree of the venturi part.
The inclined plate portion,
And a predetermined blockage inclination angle in a blocked state of the venturi portion.
delete delete The method of claim 1,
The positive pressure detecting unit,
Variable air volume control device, characterized in that provided in the inlet and the outlet, respectively.
The method of claim 1,
The positive pressure detecting unit,
At least one sensing rod provided inside the casing unit so as to intersect or perpendicular to a moving direction of the gas;
A plurality of sensing ports disposed in the lengthwise direction of the sensing rod to sense the wind pressure or the air volume of the gas passing through the casing unit; And
And a transmitter for transmitting sensing information sensed by the sensing port.
The detection port,
Variable airflow control device characterized in that toward the outlet side.
A method for controlling the variable air volume adjusting device according to any one of claims 1, 4, and 5,
A wind volume setting step of setting a wind pressure or a wind volume of the gas to be set;
A wind volume comparing step of comparing the set value set through the air volume setting step with a current set range;
A rotation amount calculation step of calculating a rotation amount of the inclined plate part according to a difference between the setting value and the setting range when the setting value is out of the setting range; And
And an opening degree control step of forward and reverse rotation of the inclined plate part according to the rotation amount of the inclined plate part calculated through the rotation amount calculation step.
The method of claim 6,
And a fine adjustment step of finely forward / reversing the inclined plate part in response to the set value when the set value is included in the set range.

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