JPH01102240A - Lock key type constant pressure relief damper - Google Patents

Abstract

PURPOSE:To reduce the power requirement of fan and maintain a high level of ventilation efficiency by providing a lock key device which normally biases the roller to the damper in the radial direction of the lock bearing member. CONSTITUTION:A lock key device 20 is disposed above a lock bearing member 22. Where the static pressure inside the duct, for instance, is 5mmAq, if the wind pressure of outside air is less than that value, the weight of a balance weight 24 overcomes the wind pressure to cause a vane 16 to close the duct opening, and a roller 30 is locked in place by the engagement with the lock bearing part 25 of the lock bearing member 22. When the wind pressure of outside air exceeds 5mmAq, the engagement of the roller 30 with the lock bearing part 25 is released to allow the roller 30 to slide on the circumferential surface of the lock bearing member 22, which then rotates to open the vane 16. In the event the ventilation fan motor is operated, the vane 16 is automatically opened, whereas the vane 16 is closed to interrupt the outside air when the fan motor is stopped and the rush of outside air into the room is to be prevented.

Description

Detailed Description of the Invention 10 Objects of the Invention (1) Industrial Application Field The present invention relates to a constant pressure release damper, and in particular, the present invention relates to a constant pressure release damper, and in particular, the invention relates to a constant pressure release damper that automatically releases the damper based on the set wind pressure using the wind pressure, balance weight, and lock key device. This invention relates to a lock key type constant pressure release damper that opens and closes a ventilation hole.

(2) Conventional technology In air conditioning systems, the dampers installed at the outside air intake point include motor-driven dampers and manually opened/closed dampers, and damper blades are attached to the closing direction using weights or springs. It is also conceivable to replace these with dampers that are set by applying pressure.

(3) Problems to be Solved by the Invention However, according to the above configuration, in the case of a motor damper, the damper opens and closes the blades by driving a motor, and requires a motor body, a control panel, etc. was complicated and costly.

In addition, in the manual opening/closing type, the blades must be manually opened and closed each time the fan power is turned on and off, which is complicated.

In addition, in the case where the damper blades are set by biasing them in the closing direction using weights or springs, the damper is opened by attaching a weight or spring corresponding to the pressure to the damper, and the load on the weight or spring is adjusted. The problem was that it remained even after the blades were opened, placing an excessive burden on the fan power.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to maintain a low cost with a simple configuration that does not require a driving force such as a drive motor, and to provide an automatic blade opening/closing type. Another object of the present invention is to provide an improved lock key type constant pressure release damper that can reduce the energy of fan power by removing overload from the weight and spring after the blades are opened.

■9 Structure of the Invention (1) Means for Solving Problems In order to achieve the above object, the present invention comprises a frame 12 having a ventilation hole F, a rotating shaft 14 passing through this frame 12, and a rotating shaft 14 passing through this frame 12. 14 for opening and closing the ventilation hole F of the frame 12; and a stopper 40 provided on the inner wall of the frame 12 for regulating the rotational position of the blade 16 so that it rotates only in a predetermined direction. , one end of the rotating shaft 14,
a cylindrical lock receiver 22 fixed coaxially with the shaft end protruding outside the frame 12 and having a lock receiver 25;
and a balance weight 24 fixed to the lock receiver 22, and includes a roller 30 that rolls closely against the cylindrical circumferential surface of the lock receiver 22 and engages and disengages with the lock receiver 25. A lock key device 20 is provided that constantly urges a roller 30 in the radial direction of the cylindrical lock receiver 22, and when a set wind pressure is exceeded, the roller 30 of the lock key device 20 slides off the lock receiver 25 to release the lock. It is characterized in that the blades 16 are opened, and when the wind pressure falls below a set wind pressure, the blades 16 are closed by the arrangement of the balance weights 24, and the rollers 30 are engaged with the lock receivers 25.

(2) Function The present invention includes a frame 12 having a ventilation hole F, a rotating shaft 14 passing through the frame 12, and a blade 16 fixed to the rotating shaft 14 for opening and closing the ventilation hole F of the frame 12. , a stopper 40 provided on the inner wall of the frame 12 to restrict the rotational position of the blade 16 so as to rotate only in a predetermined direction;
and a cylindrical lock receiver 22 which is fixed coaxially with one end of the rotating shaft 14 at the shaft end protruding outside the frame 12 and has a lock receiver 25. It has a fixed balance weight 24,
The roller 30 includes a roller 30 that closely rolls on the cylindrical circumferential surface of the lock receiver 22 and engages and disengages with the lock receiver 25.
0 in the radial direction of the cylindrical lock receiver 22 at all times.

If the outside air pressure is below the set pressure, balance weight 24
The blade 16 closes the ventilation opening F due to the gravity of the blade 16, and at this time, the lock key device 20 locks the closed state. This locked state is maintained until the set pressure is reached.

Next, when the outside air pressure exceeds the set pressure, the gravity of the balance weight 24 is overcome, and the lock between the roller 30 and the lock receiver 25 is released, and the roller 30 is slid onto the circumferential surface of the lock receiver 22. , rotate the lock receiver 22, and remove the blade 1.
6 opens. Therefore, since the locking force of the lock key device restricts opening up to the set pressure when the blade is in the fully closed state, the balance weight can be constructed to be lightweight, unlike the case where it is simply made of weights or springs. Therefore, the degree of opening when opened is large, and a sufficient opening area is provided to improve ventilation efficiency. Therefore, the lock key device locks the blades in the fully closed state when the wind pressure is lower than the set value, and the blades are opened smoothly when the wind pressure is lower than the set value, thereby reducing the overload of the weights and springs, and in turn reducing the energy of the fan power. becomes. When the pressure falls below the set pressure,
The gravity of the balance weight 24 is overcome and the blade 16 is returned to the closed state, and this state is controlled by the lock key device 20.
It will hold the lock. When driving a ventilation fan motor, the negative pressure on the fan side, which is much greater than the outside air pressure, automatically opens the blades 16 by overcoming the gravity of the balance weight 24. When the motor is stopped to prevent outside air from flowing back into the room, etc., the blades 16 are closed until the set pressure is reached to maintain a state of isolation from outside air. Also,
By providing a limit switch on the movable part of the key body and connecting it to an indicator lamp, the open/closed state of the blade 16 is notified to the outside.

(3) Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 5 illustrate embodiments of the invention.

FIG. 1 is a schematic overall perspective view of the lock key type constant pressure release damper 10, and the constant pressure release damper 10 includes a frame 12,
The lock key type constant pressure release damper lO, which includes the rotating shaft 14, the blade 16, the stopper 40, and the lock key device 20, is arranged close to a ventilation opening, etc., and the left side in the figure is the outside air side of the ventilation opening, The fan side is on the right, and outside air flows in as shown by the arrow.

The frame 12 is a hollow rectangular frame body having a ventilation hole F, and is made of a steel plate or the like.

A rotating shaft 14 passes through the frame 12 from its side, substantially orthogonal to the ventilation direction of the frame 12 . As shown in FIG. 4, the rotating shafts 14 are supported by bearings 42 provided outside the respective frames 12. As shown in FIG. Then, one end protrudes this bearing 42,
It fits into a lock receiver 22 which will be described later.

A blade 16 is fixed to the rotating shaft 14, and the ventilation opening F is opened and closed using the rotating shaft 14 as a supporting shaft.

Further, as shown in FIG. 5, a stopper 40 is provided on the inner wall of the frame 12 to restrict the rotational position so that the blade 16 is rotated only in a predetermined direction. One side is placed as the outside air side, and the right side is placed as the fan side. Then, the blade 16 rotates only toward the right side of the fan and always tilts only in the direction of taking in air from the outside air side.

A lock receiver 22 is fixed to the shaft end of the rotating shaft 14 outside the frame 12, and a balance weight 24 is connected and fixed to the end via a fixing member S and an arm 26. has been done.

That is, a lock receiver 22 made of a substantially cylindrical body is fixed to the shaft end of the rotating shaft 14 coaxially and passing through the center of the cylindrical body. This lock receiver 22 has a lock receiver 25 which is cut in an arc shape in the direction of the cylinder axis to form a recess. Further, a fixing member S is provided at the end of the lock receiver 22 and at the shaft end of the rotating shaft, and the fixing position of the fixing member S can be adjusted around the axis by an adjustment screw (not shown).

As shown in FIG. 2, the balance weight 24 is arranged and fixed on a substantially concave straight line with the cross section of the blade 16. Therefore, the blade 16 and the balance weight 24 are
They swing relative to each other in the direction of the arrow in FIG. 2 using the rotating shaft 14 as a support shaft. The gravity of the balance weight 24 constantly balances and biases the blades 16 in the direction of closing the ventilation port F. The angle between the balance weight 24 and the blade 16 can be adjusted using the adjusting screw of the fixing member S. If the balance weight 24 is arranged counterclockwise in FIG. 2, the moment in the vertical direction becomes large, making it easier for the blades 16 to open. On the other hand, if the balance weight 24 is arranged clockwise, the blade 16 will open more easily. It becomes easier to block, and the set pressure can be adjusted higher.

Further, this balance weight 24 is fastened to the arm 26 by an adjustment bolt (not shown). and,
By adjusting the position of the balance weight 24 in the longitudinal direction of the arm 26 by adjusting this adjustment bolt, the gravitational moment can be increased or decreased. In addition, the present invention, in which similar adjustments are made by increasing or decreasing the number of balance weights, is that the present invention is equipped with a lock receiver and a lock key device to keep the blades in the fully closed state in a locked state. A lock key device 2o is provided above the lock receiver 22.

In FIG. 2.3, the lock key device 2o includes a T-shaped key body 28, a roller 30 provided at the lower end of the T-shape, and a spring 3 latched to the upper end of the T-shape.
2, and an adjustment bolt 34 connected to the other end of the spring.

The key body 28 is arranged directly above the lock receiver 22, and one end of the T-shaped upper part (the left end in the figure) is passed through a pin 28a that is erected outside the frame 12. It is formed to rotate. On the other hand, a pin 28b is provided upright at the lower end of the T-shape. And this pin 28b
is engaged with the shaft hole of the roller 3o, and the pin 28b is inserted into the roller 3o.
o is rotatably supported. The roller 30 rolls in close contact with the cylindrical circumferential surface of the lock receiver 22 while moving around the four arcuate lock receivers 25 formed on the circumferential surface of the lock receiver 22.
move to engage and disengage.

At the other end of the upper part of the single-character key body 28 (the right end in the figure),
A protrusion is formed protrudingly, and a spring 32 is attached to this protrusion.
is locked.

Further, directly below the spring 32, an oval-shaped support member 36 is fixed to the outside of the frame 12, and an adjustment port 34 is provided by screwing the support member 36 upwardly. There is. Then, at the tip of this adjustment port 34,
It is engaged and connected to the end of the spring 32, and here, the single-shaped key body 28 is always spring-biased in the radial direction of the lock receiver 22, using the pin 28a as a fulcrum. . Adjustment of this biasing force is done using Adjustment Port 3.
This is done by turning 4 to move forward and backward.

As a result, the roller 30 is always pressed in the direction of the circumferential surface of the lock receiver 22 and rolls closely on the circumferential surface. Then, the outside air side wind pressure and balance weight 2
The roller 30 is engaged with the lock receiving part 25 of the row 2 receiving body 22 before and after the set pressure, and the closed state of the blade 16 is locked, It slides off from the lock receiving part 25, releases the lock, and opens the blade 16.

As described above, the lock receiver 22 and the lock key device 20
is provided, so that even when the blades 16 are in the fully closed state, a locking force including static frictional force is at work to maintain the closed state. Therefore, even if the weight of the balance weight is reduced, the fully closed state of the blade 16 can be ensured, and therefore,
When wind pressure exceeding the set pressure or negative pressure is applied, the opening area of the ventilation port F can be increased.

Here, after the blades are opened, the overload on the balance weight is removed, and in particular, the excessive energy burden of the fan power is reduced.

Now, if the set pressure (static pressure inside the duct) is 5 mmAq, if the outside air pressure is less than that, the gravity of the balance weight 24 will overcome the force of gravity and the blade 16 will block the ventilation port F, as shown in FIG. At this time, the roller 30 engages with the lock receiving portion 25 of the lock receiving body 22 to lock the closed state.

This locked state is maintained up to the set pressure of 5 mmAq. Next, when the outside air pressure exceeds 5 mmAq, the gravity of the balance weight 24 is overcome and the lock between the roller 30 and the lock receiver 25 is released, and the roller 30 is moved to the lock receiver 22.
The lock receiver 22 is rotated to open the blade 16 in the direction of the arrow in FIG. 2, thereby obtaining the open state of the blade 16 as shown in FIG. 3. Once again, if it becomes less than 5mmAq, the gravity of the balance weight 24 etc. will overcome the weight of each blade.
6 is returned to the closed state, and this state is kept locked by the lock key device 20.

Note that when the ventilation fan motor is driven, a negative pressure on the fan side that is much greater than the outside air pressure is applied, and this negative pressure overcomes the gravity of the balance weight 24 and automatically opens the blades 16. becomes.

Therefore, when driving the ventilation fan motor, the blades 16 are automatically opened and the fan motor is stopped.
To prevent outside air from flowing back into the room, etc., the blades 16 are closed until the set pressure is reached to maintain a state of isolation from outside air.

Fig. 11(a) is a graph showing the relationship between the outside air pressure or negative pressure P and the air volume Q, and shows that the outside air pressure or the negative pressure of the ventilation fan is equal to the locking force of the lock key device and the low receptacle. When a wind pressure that exceeds a set pressure is applied, fresh outside air flows into the room at that moment, and at the same time, the wind pressure suddenly decreases. At this time, the blades 16 quickly release against wind pressure because of the lightweight balance weight. Then, the wind pressure and the air volume are gradually increased while maintaining a wide opening surface and maintaining an equilibrium between the wind pressure and the balance weight 24. In this respect, compared to the graph of the conventional weight or spring shown in Fig. ti(b), the device according to the present invention rotates with a large opening after releasing the locking force, and immediately A wide opening area is used to increase the airflow, increase the amount of fresh outside air flowing in, and draw a gently sloping curve.However, the conventional type has a large weight and a small opening area, so it is difficult to create a steeply sloping curve. Understand how to draw curves.

In addition, 38 is a display lamp, and the T-shaped key body 28
By providing and connecting a limit switch at the lower right end of the key body 28, the open/closed state of the blade 16 is notified to the outside as the right end of the key body 28 moves up and down.

Next, a modification of the lock key type constant pressure release damper according to the present invention will be explained. The same members as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted (first modification). FIG. 8 shows a first modified example, and in this modified example, the configuration of the lock key device 44 is as shown in FIG. 7. That is, the lock key device 44 includes a support plate 46 fixed to the outside of the frame 12;
A support bolt 48 fixed to the support plate 46, a screw body 50 screwed into the bolt hole of the support bolt 48, and a spring 54 disposed in a blind hole 52 bored inside the screw body 50. The blind hole 52 including the ball 56 disposed at the mouth of the blind hole 52 is bored in the coaxial portion of the screw body 50, and the recessed portion thereof is formed to be slightly smaller in the radial direction. A ball 56 is partially exposed at the mouth of the blind hole and is always urged by the spring 54 in the direction of removal from the hole. Therefore, when the ball 56 rolls on the cylindrical circumferential surface of the lock receiver 22, the ball 56 is pressed inward against the biasing force of the spring 54, but the blade 16 is not fully closed. When this happens, the ball 56 slides down and locks into the recess of the lock receiver 25 to lock the closed state of the blade 16. When the wind pressure exceeds the set pressure, the ball 56 slides out of the lock receiver 25 and returns to the blank hole. The lock receiver 22 is pressed in the opposite direction and rolls on the cylindrical circumferential surface of the lock receiver 22.

(Second Modification) FIG. 9 shows a second modification, in which the lock receiving portion 58 is provided in the radial direction on the plane of the cylindrical body. A lock key device similar to that of the first modification is engaged with and disengaged from this lock receiving portion 58, and the same effects as described above are obtained.

(Third Modification) Figure 1θ shows a third modification. In this modification, the lock receiver 60 has a truncated cone shape, and the same lock key device as in the first modification engages and disengages to obtain the same effects as described above.

(Detailed explanation of the invention) According to the lock key type constant pressure release damper according to the present invention, a cylindrical lock receiver having a lock receiver, a balance weight fixed to the lock receiver,
a lock key device that includes a roller that rolls closely against the cylindrical circumferential surface of the lock receiver and that engages and disengages from the lock receiver, and that constantly urges the roller in the radial direction of the cylindrical lock receiver; Because it is equipped with, no driving force such as a drive motor is required,
The simple structure keeps costs low, and the blades can be automatically opened and closed using a balance weight. Moreover, after the blades are opened, the overload of the weight and spring is removed, reducing fan power energy and improving ventilation efficiency. Can be kept in good condition.

[Brief explanation of the drawing]

1 to 5 are diagrams showing embodiments of the present invention. FIG. 1 is an overall schematic perspective view of a lock key type constant pressure release damper. 2 and 3 are front views of the same damper, FIG. 4 is a sectional view taken along the line IV-N in FIG. 2, and FIG. 5 is a sectional view in the ventilation direction of the lock key type constant pressure release damper. 6 to 11 are views showing modified examples of the present invention, FIG. 6 is a front view of a lock key type constant pressure release damper according to the first modified example, FIG. 7 is an enlarged explanatory view of the same, FIG. 8 is an enlarged sectional view of the support bolt and screw body. FIG. 9 is a schematic explanatory diagram of a lock key type constant pressure release damper according to the second modification. FIG. 10 is a lock key type constant pressure according to the third modification. A schematic diagram of an open damper, FIG. 11(a) is a graph showing the relationship between wind pressure or negative pressure and air volume of the damper according to the example, and FIG. 11(b) is a graph showing the relationship between the damper using the conventional weight or spring type. It is a graph showing the relationship between wind pressure etc. and air volume. F001 ventilation port, 10. , lock key type constant pressure release damper, 12. ,,Frame,14. ,,rotation axis,16. ,,feather,20. ,,Lock key device, 22,,Lock receiver,
24. ,, balance weight, 25. ,, lock receiving part,
28. ,,Key body, 30-,,Roller, 40. ,, Stopper patent applicant Takenaka Corporation Co., Ltd. Kyoritsu

Claims (1)

[Claims] 1. A frame having a ventilation hole, a rotating shaft passing through the frame,
a blade fixed to the rotating shaft to open and close the ventilation hole of the frame; a stopper provided on the inner wall of the frame to restrict the rotational position of the blade so that the blade rotates only in a predetermined direction;
A cylindrical lock receiver that is fixed coaxially with one end of the rotating shaft and protrudes outward from the frame and has a lock receiver, and a balance weight that is fixed to the lock receiver. a lock key device that includes a roller that rolls closely against the cylindrical circumferential surface of the lock receiver and that engages and disengages from the lock receiver, and that constantly urges the roller in the radial direction of the cylindrical lock receiver. and when the set wind pressure is exceeded, the roller of the lock key device slides off the lock receiving part to release the lock and open the blade, and when the set wind pressure is lower than the set wind pressure, the blade is closed by the gravity of the balance weight,
A lock key type constant pressure release damper, characterized in that the roller is engaged with the lock receiver. 2. The lock key device has a pin erected at the lower end of the T-shape, and the roller is pivotally supported by the pin.
a key body formed such that one end of the T-shaped upper part passes through a pin provided in the frame and rotates around the pin; a spring locked to the other end of the T-shaped upper part of the key body;
an adjustment bolt connected to the other end of the spring and attached to a support member fixed to the frame, the spring always controls one end of the T-shaped key body in the radial direction of the lock receiver. 2. The lock key type constant pressure release damper according to claim 1, wherein the roller is urged to press against the cylindrical peripheral surface of the lock receiver.