JP6502278B2 - Kitchen exhaust VAV or CAV device - Google Patents

Description

  The present invention relates to a VAV (variable air volume) or CAV (constant air volume) device for exhausting a kitchen, and in particular, considering the workability of periodic inspection of the damper portion, the actuator portion, the differential pressure sensor portion and the controller portion in the device. It is an object of the present invention to provide an apparatus capable of maintaining the above control.

As a conventional kitchen exhaust system, an outdoor air introduction duct is connected in the middle of the exhaust duct, and a kitchen exhaust system for diffusing and diluting odor due to the atmosphere is proposed by the invention described in JP-A-11-83106. At the same time, in the invention described in Japanese Patent Application Laid-Open No. 2002-195618 (Patent Document 2), there is proposed a kitchen exhaust system which improves the collection performance of the mist formed by the non-combustible filter.
Thus, as for Patent Document 2, a method for efficiently removing the oil mist contained in the kitchen exhaust has been proposed in the kitchen exhaust device of Japanese Patent Laid-Open No. 2009-45594 (Patent Document 3).
Moreover, in addition to the oil mist removal function, the cleaning duct for kitchen exhaust purification and the kitchen exhaust purification device, which have an odor removal function and do not require cleaning of the kitchen exhaust duct, are disclosed in JP 2005-205311 (Patent Document 4) A kitchen exhaust system which is proposed by the invention and which exhausts the oil duster from the exhaust without using the ventilation fan or the concentrated duct is proposed by the invention described in JP-A-2012-42062 (patent document 5) There is.

  Furthermore, in the invention described in Japanese Patent Application Laid-Open No. 2014-20690 (Patent Document 6), collection of exhaust gas and the like is performed more efficiently than in the conventional exhaust system, power consumption is reduced and the installation cost of the exhaust hood is reduced. A kitchen exhaust system capable of providing an excellent kitchen exhaust system is proposed, and a kitchen exhaust system for improving the exhaust efficiency of exhaust gas is proposed in the invention described in JP-A-2014-44010 (Patent Document 7) It is done.

Japanese Patent Application Laid-Open No. 11-83106 Japanese Patent Laid-Open No. 2002-195618 JP, 2009-45594, A JP 2005-205311 A JP, 2012-42062, A JP, 2014-20690, A JP, 2014-44010, A

  Now, in the above-mentioned conventional patent documents 1 to 7, consideration is given to exhausting the exhaust gas to the outside air in the kitchen exhaust system, but the exhaust VAV (varying air volume) or CAV (constant air volume) in the kitchen exhaust system The device is not considered at all.

  In the present invention, the damper unit, actuator unit, differential pressure sensor unit, and controller unit required for the construction of the VAV or CAV apparatus for exhausting a kitchen are integrated into a unitized unit and the stable control in the unit is maintained. It is an object of the present invention to provide a kitchen exhaust VAV or CAV device which can carry out regular inspection work easily and quickly.

According to a first aspect of the present invention, there is provided a frame body having a connecting frame for an exhaust duct and a kitchen equipment duct, a damper portion comprising an air volume adjusting damper blade rotatably supported in the frame body, and An actuator unit that opens and closes damper blades, a differential pressure sensor unit that measures the wind speed of the frame, a pitot tube that inputs a differential pressure signal by multipoint wind speed measurement in the frame to the differential pressure sensor unit, and the damper The control unit controls the amount of air in the frame to a predetermined amount while controlling the opening and closing of the blades through the actuator portion. The damper blade is formed of stainless steel and the damper blade is rotated in the frame. The bearing which freely pivots is formed by a bearing collar formed of a stainless steel material and a sealed ball bearing, and the pitot tube is fully pressured upwind at a predetermined pitch. In the kitchen exhaust VAV or CAV device configured by forming a measurement hole on the downwind side and opening a static pressure measurement hole and forming it by a stainless steel material and detachably mounting it in the frame body, the controller unit is A differential pressure sensor section in the frame detects a differential pressure generated in the damper section, converts it into a wind speed and an air volume, and controls so that the air volume in the duct main body can be kept constant. Compares the wind speed detected by the set speed with the wind speed detected, and performs comparison control by changing the energization time for turning the actuator on with the speed command value output as the speed command with the operation amount of the actuator as the speed command. In addition, one integrator is provided in the closed loop so that control can be performed while eliminating the steady-state deviation of proportional control, and the current air volume and the set air When the current air volume is less than the set air volume, the actuator section is controlled in the direction to open the damper blade, and in the direction to close the damper blade if the air volume is larger than the set air volume. When the set air volume matches, the control of the actuator unit is stopped, and the speed command value is arbitrarily changed by the parameter as the operating speed of the actuator unit, and the delay of the wind speed fed back to the control cycle of the control The sampling period which does not cause is set to 1 meec, and the sampled value is configured to allow stable control from a low wind speed region by attenuating quantization noise and disturbance noise with a plurality of filters, and The damper blade should be configured to minimize the amount of polymerization with the blade holder attached to the duct main body of the frame. To prevent adhesion due to adhesion of oil from the kitchen, and the pitot tube is provided with a mounting frame for the duct body of the frame, and the mounting port of the measuring tube as the pitot tube is used. The mounting bracket is fixedly attached to the mounting bracket by a screw and detachably attached to the mounting frame with a thumbscrew, and the mounting frame is placed at a predetermined position inside the duct main body of the frame. By fixing and mounting the measuring pipe as the pitot pipe outside the duct body of the frame, removing the thumbscrew for fixing the holding metal fitting to the mounting frame together with the holding metal fitting and the duct of the frame It is characterized in that it can be removed while being pulled out to the outside of the duct body from the main body.

According to the present invention, in the exhaust system required for kitchen equipment, it is possible to control while maintaining the air volume in the duct constant and stably, and performing regular inspection work simply and quickly. It is possible.
Moreover, the main part of the said apparatus enables the washing | cleaning or replacement | exchange operation by the state removed from the frame inside while considering the durability on the response | compatibility in a kitchen apparatus.

FIG. 1 is a perspective view showing a first embodiment of the device of the present invention Fig. 2 is an explanatory view of the configuration of each part of Fig. 1 FIG. 3 is an explanatory view showing an embodiment of the method for controlling the wind speed in the frame in FIG. FIG. 4 is a partial side cross-sectional view of a damper blade of the damper portion. Fig. 5 shows the pitot tube of Fig. 1 and Fig. 2 (a) is a side view, (b) is a front view of the holding bracket, Fig. 6 is an explanatory view showing the pressure difference / wind speed characteristic by the pitot tube FIG. 7 is an explanatory view showing the arrangement of the device of the present invention in the kitchen

FIG. 1 is a perspective view showing a first embodiment of a VAV or CAV apparatus for exhausting a kitchen according to the present invention, and FIG. 2 is a configuration explanatory view thereof.

  In FIGS. 1 and 2, 1 is a VAV or CAV apparatus for exhausting a kitchen according to the present invention (hereinafter simply referred to as an apparatus for exhausting a kitchen), which is shown in FIGS. A frame 2 composed of a connecting frame 21 with a kitchen side duct (not shown) and a connecting frame 22 with an exhaust fan 9 (shown in FIG. 7), the shaft 2 rotatably rotatable in the duct main body 20 of the frame 2 The damper portion 3 comprising the damper vanes 30, the actuator portion 4 for opening and closing the damper vanes 30 of the damper portion 3, and the two pitot tubes 6 while being bridged in the duct main body 20 of the frame 2. A differential pressure sensor unit 5 is provided which is internally mounted and takes out a differential pressure signal of the two pitot pipes 6, and the damper blade of the damper unit 3 is controlled while controlling the actuator unit 4 based on the differential pressure signal of the differential pressure sensor unit 5. By opening and closing 30 , And it constitutes by providing the controller unit 7 for controlling the air volume of the frame body 2 to the predetermined airflow.

Incidentally, the controller unit 7 is always specified (VAV) or constant (CAV) air volume even if the static pressure in the frame 2 changes according to the purpose of the device 1, that is, the VAV or CAV device. It is configured to be able to control.
Then, the differential pressure generated in the damper is detected by the differential pressure sensor unit 5 in the frame 2 (in the damper), converted to the wind speed and the air volume, and the air volume in the duct main body 20 can be kept constant. It is controlled by the controller unit 7.
As an example, FIG. 3 is a block diagram showing an embodiment of the control method.

This is configured to compare the wind speed detected by the differential pressure sensor unit 5 and the set wind speed, and output the operation amount of the actuator unit 4 as a speed command based on the deviation thereof, and the actuator unit 4 is It is possible to perform simple comparison control by changing the energizing time to be ON. In addition, since one integrator is provided in the closed loop, steady-state deviation of proportional control can be eliminated, and highly accurate control is possible.

  Then, compare the current air volume and the set air volume, and control the actuator unit 4 in the direction to open the damper blade 30 when the current air volume is less than the set air volume, and in the direction to close the damper blade 30 when it is more than the set air volume. When the current air volume and the set air volume match, the control of the actuator unit 4 is stopped. The speed command value is the operating speed of the actuator unit 4 and can be arbitrarily changed with parameters, and the sampling cycle is shortened to 1 meec so as not to cause a delay of the wind speed fed back to the control cycle. By attenuating quantization noise and disturbance noise with a filter, stable control can be made possible from a low wind speed region.

  In the configuration of the damper blade 30 of the damper portion 3, the frame 2 can be configured to have a shape corresponding to, for example, a rectangular or round configuration, and the frame is made to correspond to a kitchen device to prevent oil In consideration of the properties, it is made of stainless steel and has a configuration corresponding to the surface coating etc.

  The same applies to the rotary shaft 31 that rotatably supports the damper blade 30 with respect to the duct main body 20 of the frame 2 and its bearing (not shown) is a bearing collar (made of SUS) and a sealed type. By using a ball bearing (not shown), it is made to cope with corrosion by oil.

Furthermore, as shown in FIG. 4, the amount of polymerization of the damper blade 30 with the blade holder 23 attached to the duct main body 20 of the frame 2 is minimized as shown in FIG. Configure to be able to avoid it.
In addition to the simple structure of the differential pressure type wind sensor by the pitot tube 6 and high reliability, the differential pressure sensor unit 5 can measure the multi-point wind speed in the frame 2, so it is accurate. Air volume control is possible.

This has a feature that can be implemented corresponding to any air flow direction such as upward, downward, horizontal and oblique.
Then, with respect to the pitot tube 6, as shown in FIG. 5 shown as an example thereof, two measuring tubes 60, 61 having a length corresponding to the width direction of the frame 2 are fixed at the tip and length direction The differential pressure measurement holes (φ5 mm) 62, 63 are opened at a pitch of 50 mm between them, and outlets for differential pressure signals 64, 65 are provided at the rear end opening. Do.

Further, in the case of mounting in the duct main body 20 of the frame 2, as shown in FIG. 5 , a mounting frame 66 with the duct main body 20 is provided, and the mounting frame 66 is shown in FIG. Fix the mounting ports 64 and 65 of the two measuring pipes 60 and 61 to the holding fixture 68 with a screw 67 and attach the holding fixture 68 detachably to the mounting frame 66 with a thumbscrew 69. Configure by

Thus, by mounting the mounting frame 66 at a predetermined position on the inner side of the duct main body 20 of the frame 2 and mounting it, the pitot tube 6 consisting of two measuring tubes 61. That is, by removing the thumbscrew 69 for fixing the holding fitting 68 to the mounting frame 66 on the outside of the duct main body 20, it can be removed while being pulled out from the inside of the duct main body 20 together with the holding fitting 68. .

That is, the pitot tube 6 is detachably attached to the frame 2 so that maintenance work can be easily performed.
For example, it is possible not only to check dirt such as oil and check at the occurrence of control problems, but also to facilitate cleaning of the pitot tube 6 and, in some cases, to replace the pitot tube 6 itself Thus, the maintenance and inspection workability of the differential pressure sensor unit 5 can be improved.

  Further, as described above, the measurement holes 62 for the total pressure are set on the windward side, and the measurement holes 63 for the static pressure are set on the windward side, as described above, It is possible to execute control of the target wind speed and air volume by control by the actuator control while measuring the differential pressure signal of and inputting it to the controller unit 7 (see FIG. 2).

The pressure has the following relationship,
Total pressure = dynamic pressure + static pressure The differential pressure generated in the office or pitot tube 6 is given by the above relation: differential pressure (dynamic pressure) = total pressure-static pressure. This dynamic pressure has the following relationship with the wind speed. You
Wind speed = C√ differential pressure: C is a flow coefficient. Further, the characteristic of FIG.

  In the case of a rectangular damper or a large duct, it is necessary to measure and average the wind speed at multiple points, but according to the first embodiment, the configuration is provided with a large number of differential pressure measurement holes 62, 63 of the pitot tube 6. The differential pressure can be averaged, and in the case of a large duct, it is possible to easily measure the wind speed in the duct 20 by increasing the number of pitot tubes 6.

  FIG. 7 shows a configuration in which a kitchen exhaust system 1 having the following configuration is applied to a kitchen exhaust system.

  In FIG. 7, reference numeral 8 denotes a kitchen, and the duct 20 of the frame 2 of the kitchen exhaust device 1 of the present invention is connected to each of the ducts 11 of the range hood and fryer of the kitchen equipment in the same kitchen 8 through a connecting frame 21. At the same time, by connecting to the duct 90 of the exhaust fan 9 through the connection frame 22 and controlling the controller unit 7 of the kitchen exhaust system 1 by the central control panel 70 of FIG. It is possible to carry out.

1 VAV or CAV device for kitchen exhaust 2 Frame 3 Damper 4 Actuator 4
Reference Signs List 5 differential pressure sensor unit 6 pitot tube 7 controller unit 8 kitchen 9 exhaust fan 10 range hood, flyer, etc. 20 duct main body 21, 22 connecting portion 23 blade receiving portion 30 damper receiving member 31 damper shaft 31 rotating shaft 32 63 Measurement hole 64, 65 Differential pressure signal outlet 66 Mounting frame 67 Screw 68 Maintenance bracket 69 Thumbscrew 70 Central control panel 90 Exhaust duct

Claims (1)

A frame having a connecting frame with an exhaust duct and a kitchen equipment duct;
A damper portion comprising an air volume adjusting damper blade rotatably supported in the frame;
An actuator unit for opening and closing a damper blade of the damper unit;
A differential pressure sensor unit that measures the wind speed of the frame;
A pitot tube for inputting a differential pressure signal by multi-point wind velocity measurement in the frame to the differential pressure sensor unit;
The damper blade is constituted by a controller unit that controls the air volume in the frame body to a predetermined air volume while controlling the opening and closing of the damper blade via the actuator unit,
The damper blade is formed of a stainless steel material, and the bearing portion rotatably supporting the damper blade in the frame is formed of a bearing collar formed of a stainless steel material and a sealed ball bearing.
And, the pitot tube has a measurement hole for total pressure on the windward side at a predetermined pitch, a hole for measurement of static pressure on the windward side and is made of a stainless steel material, and is detachably mounted in the frame body. In the kitchen exhaust VAV or CAV device configured by
The controller unit detects a differential pressure generated in the damper unit by a differential pressure sensor unit in the frame, converts it into a wind velocity and an air volume, and controls so that the air volume in the duct main body can be kept constant. The wind speed detected by the differential pressure sensor unit is compared with the set wind speed, and the deviation of the operating time for turning the actuator unit ON with respect to the speed command value output as the speed command changes the deviation of the operation amount of the actuator unit. While performing comparative control, and providing one integrator in the closed loop so as to be able to perform control while eliminating steady-state deviation of proportional control,
The current air volume and the set air volume are compared, and if the current air volume is less than the set air volume, the actuator is controlled in the direction to open the damper blade, and in the direction to close the damper blade if the air volume is more than the set air volume. And
When the current air volume and the set air volume match, the control of the actuator unit is stopped,
Further, the value obtained by sampling the speed command value as the operating speed of the actuator section using a parameter as the sampling cycle which does not cause a delay of the wind speed fed back to the control cycle of the control. Is configured to allow stable control from a low wind speed region by attenuating quantization noise and disturbance noise with a plurality of filters,
Further, the damper blade of the damper portion is configured to be able to avoid adhesion due to the adhesion of oil from the kitchen by configuring the amount of polymerization with the blade holder attached to the duct main body of the frame as small as possible. ,
The pitot tube is
An attachment frame for the duct body of the frame is provided, and an attachment port of the measurement pipe as the pitot tube is fixed to a holding bracket by a screw and attached, and the holding bracket can be detachably attached to the attachment frame by a thumbscrew By attaching to
By mounting the mounting frame at a predetermined position on the inside of the duct main body of the frame while mounting the mounting frame, the measuring pipe as the pitot tube is provided outside the duct main body of the frame,
A kitchen exhaust VAV is characterized in that it can be removed while being pulled out from the inside of the duct body of the frame together with the holding bracket by removing the thumbscrew that fixes the holding bracket to the mounting frame. Or CAV device.

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