JPH0788965B2 - Open / close valve for air conditioning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an improvement of an on-off valve for air conditioning, and particularly to the use of piezoelectric ceramics.

[Conventional technology]

In recent years, in factories and building offices that are factory-automated, a precise air conditioning system is required with the introduction of computers.

Conventionally, the air volume in an air conditioning control system is adjusted by blowing air from a blower installed in the entire factory or building or on each floor through ducts, installing an electric damper corresponding to the ceiling of each room, and providing a ceiling with multiple ventilation holes. The method of blowing air from the panel to the room is adopted.

[Problems to be solved by the invention]

However, conventionally, since the air blown to the ceiling space of each room is only adjusted by the electric damper, pressure loss occurs depending on the positional relationship between the electric damper and the duct, and even the air volume of any ventilation hole of the ceiling panel is uniform. Was hard to get. Moreover, these problems become more prominent as the size of the room increases.

Therefore, in order to solve the above-mentioned problem, it is considered that the partition of the ceiling space is subdivided and the arrangement of the electric damper and the duct is complicated, but such a method has a problem that the cost of the system becomes high. .

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 partition of the ceiling space or complicating the arrangement of the electric damper duct. The purpose is to provide an on-off valve for air conditioning.

[Means for solving problems]

An air-conditioning on-off valve according to the present invention includes a bendable metal plate attached along a surface of a panel having a ventilation hole, a valve body that opens and closes the ventilation hole when the metal plate is deformed, and the above-mentioned metal plate. It is characterized by comprising a piezoelectric ceramic provided on the surface.

Various concrete structures of the air-conditioning on-off valve according to the present invention are conceivable. For example, the metal plate may have a linear shape, a valve body for opening and closing a ventilation hole is attached to its free end, and piezoelectric ceramics may be provided on the surface of the metal plate. Further, the metal plate may also serve as the valve body, and a plurality of piezoelectric ceramics may be arranged along the cut on the surface of the metal plate provided with the cut.

[Action]

With such an air-conditioning on-off valve, it is possible to perform precise air volume control by voltage driving for each vent hole with a very simple structure, and it is highly reliable. In addition, it is lightweight, easy to install, and consumes little power. For this reason, the partition of the ceiling space is not subdivided, and the cost of the system is not significantly increased due to the complicated arrangement of the electric damper duct.
Further, it can be combined with an infrared temperature sensor, a humidity sensor, etc., which facilitates the design of the control system.

〔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. In FIGS. 1 (a) to 1 (c), the ceiling panel 1 is formed with a large number of vent holes 2 having a diameter of 40 mm. On the upper surface of the ceiling panel 1, a metal plate 4 having a length of 150 mm, a width of 20 mm, and a thickness of 0.3 mm that can be bent through a spacer 3 is fixed by a bolt 5 at its center, and free ends at both ends are vent holes 2 Extending in the direction of. On the lower surface of each free end side of the metal plate 4, valve bodies 6, 6 having a diameter of 44 mm for opening and closing the vent hole 2 are attached. Further, on the upper surface of the metal plate 4, a length of 65 mm, a width of 10 mm, and a thickness of 0.
Piezoelectric ceramics 7, 7 of 3 mm are provided. Lead wires 8 and 8 are connected to one ends of the metal plate 4 and the piezoelectric ceramics 7 and 7, respectively, and a DC voltage is applied so as to have the same polarity as the polarization polarity of the piezoelectric ceramics 7 and 7.

The open / closed state of the air conditioning on-off valve will be described with reference to FIGS. 1 (a) and 1 (b). That is, when no voltage is applied, the metal plate 4 is not deformed, and the valve bodies 6 and 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 so that the air from the blower 10 is sent to the room through the ventilation hole 2.

The magnitude of the applied voltage and the valve body 6 in the air-conditioning on-off valve
2 shows the relationship with the opening degree (displacement amount at the center of the vent hole 2). As is clear from Fig. 2, when a voltage of 260 V is applied, which is almost proportional to the magnitude of the applied voltage and the displacement, 2.
It can be seen that a displacement amount of 4 mm is obtained, and the opening degree of the valve body 6 can be sufficiently adjusted by the magnitude of the applied voltage. Even when a voltage of 260 V is applied, the flowing current is 1 μA or less,
It consumes little power and can be operated inexpensively.

In the above air-conditioning on-off valve, the load amount applied to the valve body 6 is changed, and the displacement amount when the load weight and the force generated when a voltage of 260 V is applied are balanced are shown in FIG. FIG. 3 shows that this on-off valve can withstand wind pressures up to about 6.8 kg / m ² .

FIG. 4 shows the amount of displacement when a voltage of 260 V is intermittently applied (switched) to the air conditioning on-off valve. As is clear from FIG. 4, this on-off valve exhibits a very stable displacement amount characteristic, and it can be seen that valve opening / closing control can be performed with high accuracy.

Actually, FIG. 5 shows the displacement amount when the wind speed of the air blown from the duct 9 is changed and a voltage of 260 V is applied in the configuration shown in FIG. 1 (c). From Fig. 5, it was found that at a wind speed of 3 m / s, which is generally used, the decrease in displacement was only about 0.2 mm, and it could withstand actual use.

In the air-conditioning on-off valve of the present invention, the shapes of the metal plate and the piezoelectric ceramics can be arbitrarily changed according to the usage conditions, that is, the required displacement amount and load size.

For example, one side of a metal plate having a length of 70 mm, a width of 20 mm, and a thickness of 0.3 mm is provided with piezoelectric ceramics having a length of lmm, a width of 10 mm, and a thickness of 0.3 mm by changing the length l. A case will be described in which the same valve element used in the above embodiment is attached to the other end (free end) and the same experiment is performed. In this case, the one with l = 65 mm corresponds to the above embodiment.

FIG. 6 shows the relationship between the length l of the piezoelectric ceramics and the amount of displacement when a voltage of 260 V is applied. When the length l of the piezoelectric ceramics is different, the load weight applied to the valve body 6 is changed, and the displacement amount when the load weight and the force generated when a voltage of 260 V is applied are balanced It shows in FIG. As is clear from FIG. 7, even if the length of the piezoelectric ceramics changes, the change in the displacement amount with respect to the magnitude of the load shows the same tendency as in the case of the embodiment, and the design change can be made arbitrarily according to the use conditions. It turns out that it is possible.

Further, piezoelectric ceramics may be provided on both surfaces of the metal plate to form a bimorph shape so as to cope with a case where a larger stress is generated and a large load is applied.

For example, piezoelectric ceramics with a length of 65 mm, a width of 10 mm, and a thickness of 0.3 mm are provided on both sides of a metal plate with a length of 70 mm, a width of 20 mm, and a thickness of 0.3 mm, and one end of the metal plate is fixed and the other end (free end). A case where the same valve body as that used in the above embodiment is attached to and the same experiment as described above is performed will be described.

The relationship between the applied voltage and the amount of displacement is shown in Fig. 8, and the amount of displacement when the load weight applied to the valve body is changed and the force generated when a voltage of 260 V is applied is balanced is shown in Fig. 8. Each is shown in FIG. Although the displacement amount is small as shown in FIG. 8, it can be seen that it can withstand a large load weight as is clear from FIG.

Further, in the above description, the one in which the valve body is provided at the free end of the linear metal plate and the piezoelectric ceramic is provided on the surface of the metal plate is used, but the one shown in FIGS. 10 and 11 may be used. .

What is shown in FIGS. 10 (a) and (b) is a square metal plate.
11 also serves as a valve body, the metal plate 11 is alternately provided with cuts from one side to the other, and a plurality of piezoelectric ceramics 12 divided on the surface of the metal plate 11 are provided along the cuts. It is a thing. The metal plate 11 is mounted on the ventilation hole of the panel, and when a voltage is applied, the metal plate 11 is distorted upward in a stepwise manner to open the ventilation hole.

In FIGS. 11 (a) and 11 (b), the regular hexagonal metal plate 13 also serves as the valve body, and the metal plate 13 is cut into a spiral shape and divided on the surface of the metal plate 13. A plurality of piezoelectric ceramics 14 are provided along the cut. The metal plate 13 is mounted on the vent hole of the panel, and when a voltage is applied, the metal plate 11 is spirally distorted upward and the vent hole is opened.

By coating the piezoelectric ceramics with a resin, durability against moisture, oil, dust, etc. can be improved. Further, the control system can be easily designed by combining it with an infrared temperature sensor, a humidity sensor and the like.

〔The invention's effect〕

As described above in detail, according to the air-conditioning on-off valve of the present invention, precise and highly reliable air volume control can be performed without causing a significant increase in cost, and by combining with other sensors, etc. This has remarkable effects such as easy design of the control system.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing a mounting state of an air conditioning on-off valve to a ceiling panel in the embodiment of the present invention, and FIG. 1 (b) shows a state in which 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 a voltage is applied to the air-conditioning on-off valve, and FIG. 2 is a characteristic diagram showing a relationship between a voltage applied to the air-conditioning on-off valve and a displacement amount, FIG. 3 is a characteristic diagram showing the relationship between the load weight of the air conditioning on-off valve and the displacement amount when 260 V is applied, and FIG. 4 is a characteristic diagram showing the switching characteristic of the displacement amount of the air conditioning on-off valve. FIG. 6 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 260 V is applied, and FIG. 6 is the ceramic length of the air-conditioning on-off valve in another embodiment of the present invention and 260 V. Fig. 7 is a characteristic diagram showing the relationship with the amount of displacement when voltage is applied. Fig. 7 shows the ceramic length of the on-off valve for air conditioning as a parameter. FIG. 8 is a characteristic diagram showing the relationship between the load weight and the amount of displacement when 260 V is applied. FIG. 8 is a characteristic diagram showing the relationship between the applied voltage and the amount of displacement of the air-conditioning on-off valve in yet another embodiment of the present invention. FIG. 9 is a characteristic diagram showing the relationship between the load weight of the air conditioning on-off valve and the amount of displacement when 260 V is applied, and FIGS. 10 (a) and 10 (b) show a modification of the air conditioning on-off valve according to the present invention. FIG. 11 is a plan view and a side view, and FIGS. 11A and 11B are a plan view and a side view showing another modified example of the air conditioning on-off valve according to the present invention. 1 ... Ceiling panel, 2 ... Vent hole, 3 ... Spacer, 4
...... Metal plate, 5 ...... Bolt, 6 ...... Valve body, 7 ...... Piezoelectric ceramics, 8 ...... Lead wire, 9 ...... Duct, 10 ...... Blower, 11, 13 ...... Metal plate, 12, 14 ... … Piezoelectric ceramics.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-282756 (JP, A) JP-A-61-282755 (JP, A) Actually developed JP-A-57-61429 (JP, U)

Claims (3)

[Claims] 1. A bendable metal plate mounted along the surface of a panel having a vent, a valve body for opening and closing the vent when the metal plate is deformed, and a metal plate provided on the surface of the metal plate. An on-off valve for air-conditioning, characterized by comprising piezoelectric ceramics. 2. A metal plate having a linear shape, a valve body for opening and closing a ventilation hole is attached to a free end of the metal plate, and piezoelectric ceramics is provided on the surface of the metal plate. The air-conditioning on-off valve according to claim 1. 3. The metal plate also serves as a valve body, and a plurality of piezoelectric ceramics are arranged along the cuts on the surface of the metal plate provided with the cuts.
The on-off valve for air conditioning described in the item.