JPS63243653A - Opening and closing valve for air conditioning - Google Patents

Abstract

PURPOSE:To permit precise and highly reliable airflow rate control, by a method wherein a piezoelectric ceramics is arranged on the surface of a metallic plate provided with valve bodies opening and closing the ventilating holes of a panel at both free ends. CONSTITUTION:A multitude of venting holes are formed on a ceiling panel 1 and a bendable metallic sheet 4 is fixed to the upper surface of the ceiling panel 1 by bolts 5 through a spacer 3; both free ends are extended to the direction of the vent holes 2; and valve bodies 6, opening and closing the vent holes 2, are attached to the lower surface of the ceiling panel 1. Piezoelectric ceramics sheets 7 are fixed to the left and right of the upper surface of the metallic sheet 4 and the ceramics sheets 7 are not deformed under a condition that a voltage is not impressed; therefore, the valve bodies 6 close the vent holes 2. When a DC voltage is impressed through a lead wire 8, the metallic sheet 4 is bent upwardly and opens the vent holes 2 whereby air from a fan 10 is blown off toward the lower part of the ceiling panel 1 through an air duct 9. Thus, uniform and precise airflow rate control may be effected without partitioning the space of the ceiling into small compartments or arranging any electric damper duct.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an air conditioning on-off valve, and particularly to one that utilizes piezoelectric ceramics.

[Conventional technology]

In recent years, with the introduction of computers, precise air conditioning systems have been required in factory automation factories and office buildings.

Conventionally, the air volume in air conditioning control systems has been adjusted by blowing air through ducts from blowers installed throughout factories and buildings or on each floor, and by installing electric dampers corresponding to the ceilings of each room, and by installing ceilings with numerous ventilation holes. The system uses a method that blows air from the panels into the room.

[Problem that the invention seeks to solve]

However, in the past, the air blowing into the ceiling space of each room was only adjusted by electric dampers, so pressure loss could occur depending on the positional relationship between the electric damper and the duct, and the air volume could not be uniformly distributed through any ventilation hole in the ceiling panel. It was difficult to obtain. Moreover, these problems become WJ2 as the size of the room increases.

Therefore, in order to solve the above-mentioned problems, it is possible to subdivide the ceiling space or complicate the arrangement of electric dampers and ducts, but these methods have the problem of increasing the cost of the system. .

The present invention has been made to solve the above problems, and it is possible to perform uniform and precise air volume control without subdividing the partitions of the ceiling space or complicating the arrangement of the electric damper Φ duct. The purpose is to provide an on-off valve for air conditioning.

[Means for solving problems]

The air conditioning on/off valve of the present invention includes a bendable metal plate attached along the surface of a panel that accommodates a ventilation hole, a valve body that opens and closes the ventilation hole as the metal plate deforms, and the metal plate The device is characterized by comprising a piezoelectric ceramic provided on the surface of the device.

Various specific structures can be considered for the air conditioning on-off valve according to the present invention. For example, a metal plate has a linear shape, and a valve body for opening and closing a vent is attached to the free end of the metal plate. , a metal plate may have piezoelectric ceramics provided on its surface, or the metal plate may also serve as a valve body, and a plurality of piezoelectric ceramics may be arranged along the notches on the surface of the metal plate provided with notches. It can be anything.

[Effect]

This kind of air conditioning on-off valve has an extremely simple structure, allows precise air volume control by voltage drive for each vent, and is highly reliable.It is also lightweight, easy to install, and has low power consumption. There are also very few. Therefore, there is no need to subdivide the ceiling space or complicate the arrangement of electric dampers and ducts, which will not increase the cost of the system significantly.Furthermore, it can be combined with infrared temperature sensors, humidity sensors, etc. Control system design becomes easier.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1(a) is a plan view of a ceiling panel to which an air conditioning on-off valve according to the present invention is attached, FIG. 1(b) is a sectional view when no voltage is applied, and FIG. FIG. 3 is a cross-sectional view when voltage is applied. In FIGS. 1(a) to (C), the ceiling panel l
A large number of ventilation holes 2 each having a diameter of 40 mm are formed in the hole.

On the upper surface of this ceiling panel 1, the central part of a metal plate 4 with a length of 150 mm, a radius of 20 am, and a thickness of 0.3 mm is fixed via a spacer 3, and the free ends of both ends are provided with ventilation holes. It extends in two directions. The lower surface of each free end side of this metal plate 4 has a diameter 4
A valve body 6.6 of Ls+m is attached. In addition, on the top surface of the metal plate 4, there are 85 mm long, ll@lhm, and 0.31 m thick (7) divided into two parts on the left and right, which are divided by the fixed part in the center.
A piezoelectric ceramic 7.7 is provided. One end of these metal plate 4 and piezoelectric ceramic 7.7 has a lead &18. a is connected, piezoelectric ceramic 7
．． A DC voltage is applied so that the polarity is the same as that of No. 7.

The opening and closing states of this air conditioning on-off valve are shown in Figures 1 (a) and (b).
). That is, when no voltage is applied, the metal plate 4 does not deform, and the valve bodies 6, 6 close the vent hole 2, as shown in FIG. 1(b). On the other hand, when a DC voltage is applied, the metal plate 4 is distorted upward and the ventilation hole 2 is opened, as shown in FIG. 1(C). A duct 9 is provided above the ventilation hole 2 of the ceiling panel 1 to send air from a blower 10 through the ventilation hole 2 into the room.

Magnitude of applied voltage and valve body 6 in the air conditioning on-off valve
Figure 2 shows the relationship between the opening degree (the amount of displacement at the center of the vent hole 2).As is clear from Figure 2, the magnitude of the applied voltage and the amount of displacement are almost proportional. As a result, a displacement amount of 2.4 av was obtained, indicating that the opening degree of the valve body 6 can be sufficiently adjusted by the magnitude of the applied voltage.

Note that even when a voltage of 280V is applied, the current flowing is 1. A, low power consumption and inexpensive operation.

FIG. 3 shows the amount of displacement when the load weight applied to the valve body 6 is balanced with the force generated when a voltage of 280 V is applied in the air conditioning on-off valve described above. Figure 3 shows that this on-off valve weighs approximately 8.8 kg/m'
This shows that the scales can withstand up to wind pressure.

Figure 4 shows the amount of displacement when a voltage of 280V is applied (switched) intermittently to the air conditioning on-off valve.As is clear from Figure 4, this on-off valve exhibits very stable displacement characteristics. It can be seen that accurate valve opening/closing control is possible.

Actually, the amount of displacement when changing the wind speed of the air blown from the duct 9 and applying a voltage of 280 V with the configuration shown in FIG. 1 (C) is shown in FIG. At the wind speed of 3 m/s used, the reduction in displacement amount was only about 0.21, and it was found that it could withstand actual use.

In addition, in the air conditioning on-off valve of the present invention, the shape of the metal plate and the piezoelectric ceramic can be arbitrarily changed depending on the usage conditions, that is, the required amount of displacement and load.

For example, length 70II11, width 20■l, thickness 0.31
On one surface of the metal plate, piezoelectric ceramics of length 1 mm, width 10 mm, and thickness 0.3 III were provided with varying lengths, one end of the metal plate was fixed, and the other end (free end) was fixed as described above. A case will be described in which an experiment similar to the above was conducted using the same valve body as used in the example. In this case, Jl
=85 mm corresponds to the above embodiment.

The relationship between the length of the piezoelectric ceramic and the amount of displacement when a voltage of 280 V is applied is shown in Figure 6. In addition, when the length of the piezoelectric ceramic is different, the load weight applied to the valve body 6 is changed. Let this load weight and 26
Figure 7 shows the amount of displacement when the force generated when a voltage of 0V is applied is balanced.As is clear from Figure 7, even if the length of the piezoelectric ceramic changes, It can be seen that the change in displacement shows the same tendency as in the example, and that the design can be arbitrarily changed depending on the usage conditions.

Further, in order to generate a larger stress and cope with a large load, piezoelectric ceramics may be provided on both sides of the metal plate to form a bimorph shape.

Example Eva, length 70+gm, [20mm, thickness 0.31
@II (7) Piezoelectric ceramics with a length of 85 mm, a width of 1 layer, and a thickness of 0.3 layer are provided on both sides of the metal plate, one end of the metal plate is fixed, and the other end (free end) is fixed with the above. A case will be described in which an experiment similar to the above was conducted using the same valve body as used in the example.

Figure 8 shows the relationship between the applied voltage and the amount of displacement, and the amount of displacement when the load weight applied to the valve body is varied and the force generated when applying a voltage of 260 V is balanced. As shown in FIG. 9 and FIG. 8, the amount of displacement is small, but as is clear from FIG. 9, it can withstand a large load weight.

Furthermore, in the above explanation, a valve body is provided at the free end of a straight metal plate, and a piezoelectric ceramic is provided on the surface of the metal plate. However, the valve body shown in FIGS. good.

In the case shown in FIGS. 1O (a) and (b), a square metal plate 11 also serves as a valve body, and cuts are made alternately from one side to the other side of the metal plate 11. A plurality of piezoelectric ceramics 12 divided into 11 surfaces are provided along the notches. This metal plate 11 is attached over the ventilation hole of the panel, and when a voltage is applied, the metal plate 11 is distorted upward in a stepwise manner, opening the ventilation hole.

In the valve shown in FIGS. 11(a) and 11(b), a regular hexagonal metal plate 13 also serves as a valve body, and the metal plate 13 is notched in a spiral manner to divide the surface of the metal plate 13. A plurality of piezoelectric ceramics 14 are provided along the notch. This metal plate 13 is attached over the ventilation hole of the panel, and when a voltage is applied, the metal plate 11 is twisted upward in a spiral shape and the ventilation hole 1 is opened.

Note that if the piezoelectric ceramic is coated with a resin, its durability against moisture, oil, flakes, etc. can be increased. Furthermore, by combining it with an infrared temperature sensor, humidity sensor, etc., a control system can be easily designed.

〔Effect of the invention〕

As detailed above, according to the air conditioning on-off valve of the present invention, it is possible to perform precise and reliable air volume control without causing a significant increase in cost. This has significant effects such as ease of designing a control system.

[Brief explanation of drawings]

FIG. 1(a) is a plan view showing how the air conditioning on-off valve is attached to the ceiling panel in the embodiment of the present invention, and FIG. 1(b) shows the state where no voltage is applied to the air conditioning on-off valve. A sectional view, FIG. 1(c) is a sectional view showing a state in which voltage is applied to the air conditioning on-off valve, and FIG. 2 is a characteristic diagram showing the relationship between the voltage applied to the air conditioning on-off valve and the amount of displacement. Figure 3 is a characteristic diagram showing the relationship between the load weight on the air conditioning on-off valve and the displacement amount when 260V is applied, Figure 4 is a characteristic diagram showing the switching characteristics of the displacement amount of the air conditioning on-off valve, and Figure 5 is a characteristic diagram showing the switching characteristics of the displacement amount of the air conditioning on-off valve. The figure is a characteristic diagram showing the relationship between the wind speed of the air supplied to the air conditioning on-off valve and the amount of displacement when 280V is applied, and Figure 6 shows the relationship between the ceramic length and 280V of the air conditioning on-off valve in another embodiment of the present invention. Fig. 7 is a characteristic diagram showing the relationship between the displacement amount when applying 260V, and Fig. 7 is a characteristic diagram showing the relationship between the load weight and the displacement amount when 260V is applied, showing the ceramic length as a parameter for the same air conditioning on-off valve.
The figure is a characteristic diagram showing the relationship between the applied voltage and the displacement amount of the air conditioning on-off valve in still another embodiment of the present invention, and FIG. 9 shows the load weight of the air conditioning on-off valve and the displacement amount when 260 V is applied. 1O (a) and (b) are a top view and a side view showing a modification of the air conditioning on-off valve according to the present invention,
FIGS. 11(a) and 11(b) are a plan view and a side view showing another modification of the air conditioning on-off valve according to the present invention. l...Ceiling panel, 2...Vent hole, 3...Spacer, 4...Metal plate, 5...Bolt, 6...Valve body,
7... Piezoelectric ceramics, 8... Lead wire, 9...
・Duct, lO...Blower, 11.13...Metal plate, 12,! 4...Piezoelectric ceramics. Applicant's agent Patent attorney Takehiko Suzue <c> Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 tp ha t'noE (o, cv) Figure 8 Figure 9 Figure 10 Figure 11

Claims (3)

[Claims] (1) A bendable metal plate attached along the surface of a panel having a vent, a valve body that opens and closes the vent as the metal plate deforms, and a piezoelectric element provided on the surface of the metal plate. An air conditioning on-off valve characterized by comprising ceramics. (2) The metal plate has a linear shape, a valve body for opening and closing a ventilation hole is attached to the free end of the metal plate, and piezoelectric ceramics are provided on the surface of the metal plate, Air conditioning on-off valve as described in scope 1. (3) The air conditioner according to claim 1, wherein the metal plate also serves as a valve body, and a plurality of piezoelectric ceramics are arranged along the notches on the surface of the metal plate provided with notches. Open/close valve.