Pressure adjustment unit

Abstract

To provide a pressure regulation unit which can hold a closed state while preventing wobbling of a blade caused by a minute pressure difference, and can smoothly open the blade in an emergency (during pressurization).SOLUTION: A pressure regulation unit 100 comprises: a blade 13 which can turn together with a shaft body 12 in order to open and close a ventilation region 11 in a frame body 10; a fan plate 15 fixed to the shaft body 12, the shaft body 12 protruding from a side face member 14R of the frame body 10; a link arm 17 which is attached to the side face member 14R via a pivot shaft 16 so as to be forwardly and reversely rotatable, and in which a roller 25 abuts on and separates from an outer periphery of the fan plate 15 by forward or reverse rotation; and a keep solenoid 36 connected to a base end 17b side of the link arm 17 via a link 28, and making the roller 25 at a tip part 17a side abut on and separate from the external periphery of the fan plate 15 by making the base end part 17b advance and retreat. A step part 15b which prohibits turning of the fan plate 15 by making the roller 25 abut on the fan plate via the keep solenoid 36 when the ventilation region 11 is closed by the blade 13 is provided on the outer periphery of the fan plate 15.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a pressure adjustment unit that is attached to an opening formed in partitioning means for partitioning a space in a building and has a function of opening when a preset pressure difference is reached.

Background Art

[0002] In recent years, a pressurized smoke exhaust system has been adopted in super high-rise buildings (generally buildings exceeding 100 m in height). The pressurized smoke exhaust system is a system that can prevent the intrusion of smoke into the evacuation route and enable safe evacuation by exhausting the smoke in the living room during a fire and pressurizing and supplying fresh air to the annex room. The pressure adjustment unit used in the pressurized smoke exhaust system pressurizes and supplies fresh air to the annex room so that smoke does not enter the annex room, which becomes a fire fighting base during a fire, and has a structure in which the blades open to maintain the pressure balance when the pressure in the annex room exceeds a certain value.

[0003] In this way, the pressure difference between the fire room and the evacuation route generated during a fire is adjusted by the pressure adjustment unit so as not to hinder the opening and closing of the fire door. Specifically, when the pressure in the annex room exceeds the specified pressure, the blades of the pressure adjustment unit are opened by the pressure difference, and the pressure in the annex room is maintained at the specified value. Examples of the air supply route through which fresh air flows when pressurizing the annex room include an elevator shaft, a vertical duct, and a staircase room.

[0004] On the other hand, as prior art related to the present invention, for example, there are a "differential pressure damper" described in Patent Document 1 or a "constant pressure opening damper" described in Patent Document 2.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a super high-rise building, under normal conditions, no air flow is generated in the air supply route and it is in a stagnant state. However, in the air supply route, due to the temperature difference between the upper and lower parts, warm air stays in the upper part of the air supply route, and the pressure in the upper part of the air supply route rises compared to the lower part. As a result, even under normal conditions, a slight pressure difference occurs between the air supply route and the annex room in the upper part, and the blades of the pressure adjustment unit may flutter. The fluttering of the blades causes the closing sound when the blades of the pressure adjustment unit are closed to be transmitted to other floors through the air supply route and also causes noise.

[0007] Such problems may similarly occur in the differential pressure damper described in Patent Document 1 and the "constant pressure release damper" described in Patent Document 2.

[0008] Therefore, the problem to be solved by the present invention is to provide a pressure adjustment unit that can prevent the fluttering of the blades caused by a slight pressure difference and maintain the closed state, and has a function of smoothly opening the blades during an emergency (pressurization).

Means for Solving the Problems

[0009] The first pressure adjustment unit according to the present invention is a pressure adjustment unit that is attached to an opening formed in a partitioning means for partitioning a space in a building and opens when a preset pressure difference is reached, and a frame body, and blades rotatably attached to the frame body via a shaft body for opening and closing a ventilation area surrounded by the frame body, a fan plate attached to the shaft body protruding from a side member of the frame body, and a link arm rotatably attached to the side member via a support shaft and capable of rotating forward and backward, and the tip side thereof contacts and disengages from the outer periphery of the fan plate as the forward and backward rotation occurs, A keep solenoid that is connected to the base end portion side of the link arm via a link and performs an operation of advancing and retracting the base end portion of the link arm to bring the tip end portion side of the link arm into contact with and separate from the outer periphery of the fan plate. When the blades are in a state of closing the ventilation area, a step portion is provided on the outer periphery of the fan plate to prevent the rotation of the fan plate by bringing the tip end portion side of the link arm into contact with the step portion of the fan plate by the holding action of the keep solenoid. Here, the keep solenoid is a component in which a permanent magnet is incorporated in a part of the magnetic circuit, attracts the plunger only by flowing an instantaneous current, remains adsorbed even when the current is cut off, and is a power-saving solenoid that returns when an inverse power is instantaneously flowed.

[0010] With such a configuration, when the blades are in a state of closing the ventilation area, the tip end portion side of the link arm contacts the step portion of the fan plate to hold the fan plate in a fixed posture. Therefore, even if a temporary pressure fluctuation occurs in the building where the pressure adjustment unit is installed, the blades do not rotate or flutter, and the generation of noise can be prevented.

[0011] Also, when the voltage polarity applied to the keep solenoid is reversed and reapplied by receiving an operation signal of the disaster prevention equipment, the link arm rotates in the reverse direction and the tip end portion side thereof separates from the step portion of the fan plate, and the blades become rotatable. Therefore, when a predetermined differential pressure (for example, 20 Pa to 50 Pa) is generated between the front side and the back side of the blades in an emergency, the blades rotate and the ventilation area is opened.

[0012] Next, the second pressure adjustment unit according to the present invention is a pressure adjustment unit that is attached to an opening formed in a partitioning means for partitioning a space in a building and opens when a preset pressure difference is reached. A frame body and blades rotatably attached to the frame body via a shaft body for opening and closing a ventilation area surrounded by the frame body. A fan plate attached to the shaft body protruding from the side member of the frame body, and a link arm rotatably attached to the side member via a support shaft and having the tip end side contacting and separating from the outer periphery of the fan plate as it rotates forward and backward, A spring suspended between a portion of the link arm located between its tip end and the support shaft and a locking member provided on the side member of the frame body, and biasing the tip end of the link arm in a direction to contact the outer periphery of the fan plate, When the blade is in a state of closing the ventilation area, a step portion is provided on the outer periphery of the fan plate to prevent the rotation of the fan plate by bringing the tip end side of the link arm into contact with the step portion by the biasing force of the spring.

[0013] With such a configuration, when the blade is in a state of closing the ventilation area, due to the biasing force of the spring, the tip end side of the link arm contacts the step portion of the fan plate to hold the fan plate in a fixed posture. Therefore, even if a temporary pressure fluctuation occurs in the building where the pressure adjustment unit is installed, the blade will not rotate or flutter, and the generation of noise can be prevented.

[0014] Also, when a predetermined differential pressure (for example, 20 Pa to 50 Pa) occurs between the front side and the back side of the blade in an emergency, and the rotational torque applied to the blade exceeds the holding force of the fan plate by the biasing force of the spring, the fan plate rotates in a direction in which the step portion disengages from the tip end of the link arm. Accordingly, the blade rotates and the ventilation area is opened.

[0015] Since the pressure adjustment unit holds the fan plate in a fixed posture by bringing the tip end side of the link arm into contact with the step portion of the fan plate by the biasing force of the spring, no electrical signal is required and no electrical wiring is required, so labor saving in construction can be achieved.

[0016] In the pressure adjustment unit, when a predetermined differential pressure (for example, 100 Pa) occurs between the front side and the back side of the blade in a state where the ventilation area is closed, the blade can be opened by the rotational torque applied to the blade by the differential pressure.

[0017] With such a configuration, even though a predetermined differential pressure (for example, 20 Pa to 50 Pa) is generated between the front side and the back side of the blade in an emergency, if the blade that closes the ventilation area is not opened due to malfunction of the keep solenoid or spring, etc., when the differential pressure exceeds a predetermined value (for example, 100 Pa), the blade will be opened by the rotational torque applied to the blade, so that fail-safe measures can be taken.

[0018] In the pressure adjustment unit, a first arc portion centered on the axis of the shaft body and a second arc portion centered on a virtual axis offset from the axis of the shaft body and having a different curvature from the first arc portion are provided in a region where the tip end side of the link arm abuts when the fan plate rotates on the outer periphery of the fan plate.

[0019] In the pressure adjustment unit, after the tip end side of the link arm disengages from the stepped portion of the fan plate, the tip end side (roller) of the link arm remains in contact with the outer periphery of the fan plate and the fan plate rotates to open the ventilation area of the blade, but the rotational movement of the fan plate (the opening movement of the blade) may not be smooth due to the biasing force of the spring. Therefore, if a first arc portion centered on the axis of the shaft body and a second arc portion centered on a virtual axis eccentric from the axis of the shaft body and having a different curvature from the first arc portion are provided in a region where the tip end side of the link arm abuts when the fan plate rotates on the outer periphery of the fan plate, the rotation of the fan plate after the tip end of the link arm disengages from the stepped portion of the fan plate will be smoothed, so that the opening operation of the blade can be performed smoothly.

[0020] In the pressure adjustment unit, a guide vane that covers the upstream end portion of the blade can be provided.

[0021] With such a configuration, the airflow flowing toward the ventilation area of the frame hits the guide vanes and changes its flow direction. Specifically, when the airflow hits the guide vanes, it prevents the airflow from flowing into the gap between the frame and the blades, so that the airflow does not hit the upstream end of the blades during the opening operation and inhibit the opening operation of the blades, and a smooth opening operation can be realized.

Effect of the Invention

[0022] According to the present invention, it is possible to provide a pressure adjustment unit that can prevent the flutter of the blades caused by a slight pressure difference and maintain the closed state, and has a function of smoothly opening the blades in an emergency (when pressurized).

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Embodiments for Carrying Out the Invention

[0024] Hereinafter, based on Figs. 1 to 18, the pressure adjustment units 100 and 200 which are embodiments of the present invention will be described.

[0025] First, the pressure adjustment unit 100 will be described based on Figs. 1 to 13. The pressure adjustment unit 100 shown in Figs. 1 to 4 is attached to the opening 2 formed in the partitioning means 1 that partitions the space inside the building, as shown in Fig. 5. In normal times, as shown in Fig. 5, the blade 13 is in the closed state, and at the time of a fire or the like, when a preset pressure difference is reached, the blade 13 becomes in the open state as shown in Figs. 10 and 12.

[0026] As shown in FIGS. 1 to 4, the pressure adjustment unit 100 includes a horizontally long rectangular prism-shaped frame body 10, a blade 13 rotatably attached to the frame body 10 via a shaft body 12 horizontally disposed on the frame body 10 to open and close a ventilation region 11 (see FIG. 5) surrounded by the frame body 10, a fan plate 15 attached to the shaft body 12 protruding from a side member 14R on the right side of the frame body 10, a link arm 17 rotatably attached to the side member 14R via a support shaft 16 and having a roller 25 on the tip end 17a side contacting and separating from the outer periphery of the fan plate 15 as it rotates forward and backward, and a keep solenoid 36 connected to the base end 17b side of the link arm 17 via a link 28 and configured to move the base end 17b of the link arm 17 forward and backward to cause the roller 25 on the tip end 17a side of the link arm 17 to contact and separate from the outer periphery of the fan plate 15.

[0027] As shown in FIGS. 1 to 3, a flange-shaped attachment portion 18 that goes around the frame body 10 is provided on the outer peripheral portion near the back surface of the frame body 10, and a plurality of through holes 18a are formed in the attachment portion 18. The front view shape of each through hole 18a is an ellipse having the circumferential direction of the frame body 10 as the major axis. Also, highly slidable bearings 19, 19 are respectively fitted in portions of the frame body 10 near the left and right ends of the shaft body 12.

[0028] As shown in FIGS. 1 to 5, when the blade 13 is in a state of closing the ventilation region 11, the roller 25 on the tip end 17a side of the link arm 17 contacts a stepped portion 15b provided on the outer periphery of the fan plate 15 due to the holding action of the keep solenoid 36, preventing the rotation of the fan plate 15. In this way, a locking mechanism for the blade 13 is formed by the fan plate 15, the link arm 17, the keep solenoid 36, etc.

[0029] As shown in Fig. 4, the outer periphery of the fan plate 15 includes a small arc portion 15d formed in a range of approximately 245 degrees centered on the axis 12c of the shaft body 12, and a large arc portion 15c formed in the remaining range of approximately 115 degrees centered on the axis 12c. The radius of the large arc portion 15c centered on the axis 12c is larger than the radius of the small arc portion 15d centered on the axis 12c. A step portion 15b is provided at the boundary between the small arc portion 15d and the large arc portion 15c.

[0030] As shown in Fig. 4, the link arm 17 is rotatably attached to the side member 14R via the support shaft 16 with its longitudinal direction in the vertical direction. A roller 25 is rotatably attached to the tip portion 17a side of the link arm 17 above the support shaft 16 via the support shaft 25a. Also, the base end portion 17b side of the link arm 17 located below the support shaft 16 and the tip end side of the plunger shaft 29 of the keep solenoid 36 are connected via the link 28 and the support shafts 26, 27.

[0031] An adsorption plate 37 to which the tip end portion of the plunger shaft 29 can be adsorbed by magnetic force is fixed to the side member 14R near the tip end portion of the plunger shaft 29 of the keep solenoid 36. When the plunger shaft 29 of the keep solenoid 36 moves forward and backward toward the base end portion 17b of the link arm 17, the base end portion 17b of the link arm 17 moves forward and backward via the link 28, and accordingly, the roller 25 on the tip end portion 17a side of the link arm 17 comes into contact with and detaches from the outer periphery of the fan plate 15.

[0032] As shown in Fig. 5, the shaft body 12 is horizontally arranged inside the frame body 10, and a blade 13 for opening and closing the ventilation area 11 surrounded by the frame body 10 is rotatably attached to the frame body 10 via the shaft body 12. The blade 13 is a substantially flat plate-like member, and its upper portion 13a and lower portion 13b are each slightly inclined toward the back side of the frame body 10. The blade 13 is fixed to the shaft body 12 at a position approximately 2 / 3 of its vertical size.

[0033] A plurality of plate-shaped weights 13d are detachably screwed onto a fixing bolt 13c erected on the back surface of the upper portion 13a of the blade 13. By changing the number of weights 13d screwed onto the fixing bolt 13c, the starting operation pressure (the pressure at which the blade 13 begins to open) can be changed (adjusted). A hanging portion 20 having an L-shaped vertical cross-section continuous with the upper surface portion 10a of the frame body 10 is provided at the upper front portion of the frame body 10, and a hanging portion 10c having a linear vertical cross-section continuous with the upper surface portion 10a of the frame body 10 is provided at the upper rear portion of the frame body 10. An induction member 21 forming a convex strip protruding toward the upper surface portion 10a of the frame body 10 is provided on the upper surface (the surface exposed inside the frame body 10) of the lower surface portion 10b of the frame body 10.

[0034] The induction member 21 is a substantially rectangular tube-shaped member having a trapezoidal vertical cross-section, and is arranged such that its longitudinal direction is parallel to the left-right direction of the frame body 10. The front portion of the induction member 21 is a standing surface 21a perpendicular to the lower surface portion 10b. A horizontal surface 21b parallel to the lower surface portion 10b is provided from the top of the standing surface 21a toward the back surface of the frame body 10, and an induction surface 21c having a downward gradient is provided from the rear edge portion of the horizontal surface 21b toward the back surface of the frame body 10. A buffer member 21d having a shock-absorbing function is attached to the front surface of the standing surface 21a.

[0035] As shown in FIG. 5, when the blade 13 is in a state of closing the ventilation region 11, the front portion of the upper portion 13a of the blade 13 abuts against the rear edge portion 20a of the hanging portion 20, and the rear portion of the lower portion 13b of the blade 13 abuts against the buffer member 21d attached to the standing surface 21a of the induction member 21.

[0036] As shown in FIGS. 3 and 5, a guide vane 24 is provided at a portion near the upper back inside the frame body 10. The guide vane 24 is formed of a substantially rectangular plate material, and is arranged in a posture with one of its surfaces facing the shaft body 12 and its longitudinal direction being parallel to the shaft body 12. The upper portion 24a and the lower portion 24b of the guide vane 24 are each bent in a direction approaching the shaft body 12. When the blade 13 rotates about the shaft body 12, the guide vane 24 is arranged outside the rotation range of the upper portion 13a, the weight 13d, and the fixing bolt 13c of the blade 13 so that the upper portion 13a, the weight 13d, and the fixing bolt 13c of the blade 13 do not contact the guide vane 24.

[0037] Next, based on FIGS. 5, 6, 7, and FIGS. 8 to 12, the operation of the lock mechanism will be described. As described above, a lock mechanism for the blade 13 is formed by the fan plate 15, the link arm 17, the keep solenoid 36, and the like. When the blade 13 is in the closed state (normal time) as shown in FIG. 5, as shown in FIG. 6, the plunger shaft 29 of the keep solenoid 36 is attracted to the attracting plate 37 by magnetic force, so that the link arm 17 is held in an upright posture. At this time, the roller 25 at the tip 17a of the link arm 17 fits into the step portion 15b of the fan plate 15, thereby locking the fan plate 15 and the shaft body 12 so that they do not rotate. As a result, as shown in FIG. 8, the blade 13 is held in the closed state.

[0038] As shown in FIG. 8, when the blade 13 is in a state of closing the ventilation area 11 (normal time), the roller 25 on the tip 17a side of the link arm 17 abuts against the step portion 15b of the fan plate 15 to hold the fan plate 15 in a fixed posture. Therefore, even if a temporary pressure fluctuation occurs in the building where the pressure adjustment unit 100 is installed, the blade 13 will not rotate or flutter, and the generation of noise can be prevented.

[0039] Next, when a voltage of a predetermined polarity is applied to the keep solenoid 36 by receiving an operation signal of the disaster prevention equipment or the like, as shown in Fig. 7(a), the plunger shaft 29 of the keep solenoid 36 is drawn in, and the base end portion 17b of the link arm 17 is drawn in the direction of arrow A via the link 28. As a result, the tip end portion 17a of the link arm 17 rotates in the direction of arrow B, and as shown in Fig. 7(b), the roller 25 disengages from the stepped portion 15b of the fan plate 15 and the blade 13 becomes rotatable freely.

[0040] Therefore, when a predetermined differential pressure (for example, 20 Pa to 50 Pa) is generated between the front side and the back side of the blade 13 in an emergency, as shown in Fig. 10, the blade 13 rotates in the direction of arrow D about the shaft body 12 due to the rotational torque applied to the blade 13, and as shown in Fig. 7(b), the fan plate 15 rotates in the direction of arrow C. As shown in Figs. 10 and 12, the ventilation area 11 is opened, and the air flow W (see Fig. 12) that has flowed into the back side of the pressure regulating unit 100 passes through the area below the blade 13 in the ventilation area 11 from the back side to the front side of the pressure regulating unit 100 and flows. Note that, as shown in Figs. 10 to 12, stoppers 22 for preventing the blade 13 in the fully open state from rotating further clockwise about the shaft body 12 are provided on the left and right side members 14L and 14R.

[0041] Next, when the differential pressure between the front side and the back side of the blade 13 becomes equal to or less than a predetermined value, as shown in Fig. 9, the blade 13 returns to the state of closing the ventilation area 11 (normal time). After that, when a voltage of a polarity opposite to that in the case of Fig. 7(a) is applied to the keep solenoid 36 by an operation signal from the disaster prevention equipment, as shown in Fig. 7(c), the plunger shaft 29 and the link 28 of the keep solenoid 36 are pushed out in the direction of arrow A', and as a result, the tip end portion 17a of the link arm 17 rotates in the direction of arrow B' and the roller 25 fits into the stepped portion 15b of the fan plate 25 and returns to the state of preventing the rotation of the fan plate 25 (the state shown in Fig. 6).

[0042] When the impeller 13 closes the ventilation area 11, the roller 25 on the tip 17a side of the link arm 17 fits into the step 15b of the fan plate 15 to hold the fan plate 15 in a fixed position in the pressure adjustment unit 100 shown in FIGS. 1 to 5. Therefore, even if temporary pressure fluctuations occur in the building where the pressure adjustment unit 100 is installed, the impeller 13 will not rotate or vibrate, and the generation of noise can be prevented.

[0043] Also, as shown in FIGS. 5 and 12, in the pressure adjustment unit 100, a guide vane 24 that covers the upstream end (upper part 13a) of the impeller 13 is provided at a position near the upper back in the frame body 10. As a result, the air flow Z flowing toward the upper part of the ventilation area 11 of the frame body 10 hits the guide vane 24 and changes its flow direction. Therefore, the air flow Z does not hit the upstream end (upper part 13a) of the impeller 13 during the opening operation, and a smooth opening operation can be realized.

[0044] As shown in FIG. 12, when the impeller 13 is in the open state, by setting the dimension such that the lower end of the lower part 24b of the guide vane 24 covers the upper end of the upper part 13a of the impeller 13, the air flow toward the upper part 13a of the impeller 13 can be reliably blocked, and the opening operation of the impeller 13 can be made smooth.

[0045] On the other hand, in the pressure adjustment unit 100, since the holding force of the keep solenoid 36 is set to 100 Pa, when a differential pressure of 100 Pa or more occurs between the front side and the back side of the impeller 13 in the state where the ventilation area 11 is closed, the holding of the keep solenoid 36 is released by the rotational torque applied to the impeller 13 by the differential pressure, and the impeller 13 is opened. In this embodiment, the holding force of the keep solenoid 36 is set to 100 Pa, but this is only an example and is not limited to this value.

[0046] Therefore, even if a predetermined differential pressure (for example, 20 Pa to 50 Pa) is generated between the front side and the back side of the blade 13 in an emergency, if the blade 13 that closes the ventilation area 11 is not opened due to a malfunction of the keep solenoid 36 or the like, when the differential pressure exceeds a predetermined value (for example, 100 Pa), the blade 13 is opened by the rotational torque applied to the blade 13, so that fail-safe measures can be taken.

[0047] Next, as shown in FIG. 12, when an air flow is supplied from the back side of the pressure adjustment unit 100 having an effective area of 0.088 m 2 , the relationship between the air volume (m 3 / h) and the static pressure (Pa) is graphed, and the results are as shown in FIG. 13. When an air flow of 2,024 m 3 / h is supplied, a differential pressure of 50 Pa is generated between the front side and the back side of the blade 13, and the blade 13 is fully opened. Looking at FIG. 13, it can be seen that since the pressure adjustment unit 100 is provided with the guide vane 24 (see FIG. 12), the relationship between the air volume (m 3 / h) and the static pressure (Pa) is a linear relationship.

[0048] Next, based on FIGS. 14 to 18, the pressure adjustment unit 200 which is another embodiment will be described. In the constituent parts of the pressure adjustment unit 200 shown in FIGS. 14 to 18, for the parts common to the pressure adjustment unit 100 described above, the same reference numerals as those in FIGS. 1 to 12 may be given in FIGS. 14 to 18 and the description may be omitted.

[0049] As shown in FIGS. 14 to 18, the pressure adjustment unit 200 is attached to the opening 2 formed in the partitioning means 1 that partitions the space inside the building, and has a function of opening when a preset pressure difference is reached. Specifically, when a predetermined differential pressure is generated between the front side and the back side of the blade 13 in a state where the ventilation area 11 is closed, the shaft body 12 rotates by the rotational torque applied to the blade 13 by this differential pressure, and the blade 13 has a function of opening.

[0050] The pressure adjustment unit 200 includes a frame body 10, a blade 13 rotatably attached to the frame body 10 via a shaft body 12 for opening and closing a ventilation area 11 surrounded by the frame body 10, a fan plate 40 attached to the shaft body 12 protruding from a side member 14R of the frame body 10, and a link arm 30 rotatably attached to the side member 14R of the frame body 10 via a support shaft 33 and having a tip end 30a side that contacts and disengages from the outer periphery of the fan plate 40 as it rotates forward and backward.

[0051] Further, in the link arm 30, a spring 31 is suspended between a through hole 35 opened in a portion located between the tip end 30a and the support shaft 33 and a locking member 32 fixed to the side member 14R of the frame body 10. The spring 31 biases the roller 34 on the tip end 30a side of the link arm 30 in a direction in which it contacts the outer periphery of the fan plate 40. The roller 34 is rotatably supported by a support shaft 34a.

[0052] As shown in FIG. 16, when the blade 13 is in a state of closing the ventilation area 11, as shown in FIG. 14, a step portion 40d that blocks the rotation of the fan plate 40 by bringing the roller 34 on the tip end 30a side of the link arm 30 into contact therewith by the biasing force of the spring 31 is provided on the outer periphery of the fan plate 40.

[0053] As shown in FIGS. 14, 15(a), and 15(b), a first arc portion 40a and a second arc portion 40c are provided on the outer periphery of the fan plate 40. The first arc portion 40a has an arc shape centered on the axis 12c of the shaft body 12, and the second arc portion 40c has an arc shape centered on a virtual axis E offset from the axis 12c of the shaft body 12. The second arc portion 40c is an area where the roller 34 on the tip end 30a side of the link arm 30 contacts when the fan plate 40 rotates about the axis 12c, as shown in FIGS. 15(a) and 15(b). The radius of curvature Re of the second arc portion 40c centered on the virtual axis E is different from the radius of curvature 40R of the first arc portion 40a centered on the axis 12c.

[0054] In the present embodiment, as shown in FIGS. 15(a) and 15(b), the radius of curvature Re of the second arc portion 40c centered on the virtual axis E is smaller than the radius of curvature 40R of the first arc portion 40a centered on the axis 12c. Further, the virtual axis E which is the center of the second arc portion 40c is at a position offset from the axis 12c of the shaft body 12. Therefore, when comparing the distances R1 and R2 from the axis 12c of the shaft body 12 to the second arc portion 40c measured at a plurality of different positions of the second arc portion 40c, the distance R2 in the arc portion closer to the step portion 40d is larger than the distance R1 in the arc portion closer to the step portion 40b between the first arc portion 40a and the second arc portion 40c.

[0055] In the pressure adjustment unit 200, as shown in FIG. 16, when the blade 13 closes the ventilation region 11, due to the biasing force of the spring 31, the roller 34 on the tip 30a side of the link arm 30 fits into the step portion 40d of the fan plate 40 and holds the fan plate 40 in a fixed posture. Therefore, even if a temporary pressure fluctuation occurs in the building where the pressure adjustment unit 200 is installed, the blade 13 will not rotate or flutter, and the generation of noise can be prevented.

[0056] On the other hand, in the present embodiment, since the holding force of the roller 34 against the fan plate 40 by the biasing force of the spring 31 is set to a predetermined value (for example, 20 Pa to 50 Pa), when the rotational torque applied to the blade 13 by the differential pressure generated between the front side and the back side of the blade 13 during an emergency exceeds the predetermined value, the holding of the roller 34 against the fan plate 40 by the biasing force of the spring 31 is released. As shown in FIG. 15(a), the fan plate 40 rotates clockwise together with the shaft body 12, and its step portion 40d disengages from the roller 34 at the tip 30a of the link arm 30. After that, as shown in FIG. 15(b), the fan plate 40 rotates clockwise together with the shaft body 12 with the roller 34 on the tip 30a side of the link arm 30 in contact with the second arc portion 40c.

[0057] Accordingly, as shown in FIGS. 17 and 18, the blade 13 rotates clockwise together with the shaft body 12, the ventilation region 11 is opened, and the airflow W (see FIG. 12) that has flowed into the back side of the pressure adjustment unit 200 passes through the region below the blade 13 in the ventilation region 11 from the back to the front of the pressure adjustment unit 200 and flows.

[0058] The pressure adjustment unit 200 is configured such that, due to the biasing force of the spring 31, the roller 34 on the tip 30a side of the link arm 30 fits into the step portion 40d of the fan plate 40 and holds the fan plate 40 in a fixed posture. Thus, electrical signals and electrical wiring are not required, and labor savings in construction can be achieved.

[0059] On the other hand, in the pressure adjustment unit 200, when a predetermined differential pressure (for example, 100 Pa) is generated between the front side and the back side of the blade 13 in a state where the ventilation region 11 is closed, the blade 13 is set to open by the rotational torque applied to the blade 13 by the differential pressure.

[0060] Therefore, even if a predetermined differential pressure (for example, 20 Pa to 50 Pa) is generated between the front side and the back side of the blade 13 in an emergency, and the blade 13 closing the ventilation region 11 is not opened due to a malfunction of the spring 31 or the like, when the differential pressure exceeds a predetermined value (for example, 100 Pa), the blade 13 is opened by the rotational torque applied to the blade 13, so that fail-safe measures can be taken.

[0061] As shown in FIGS. 14 and 15 described above, in the pressure adjustment unit 200, a second arc portion 40c is provided in a region where the roller 34 on the tip 30a side of the link arm 30 abuts when the fan plate 40 rotates on the outer periphery of the fan plate 40. As described above, the radius of curvature Re centered on the virtual axis E of the second arc portion 40c is smaller than the radius of curvature 40R of the first arc portion 40a centered on the axis 12c of the shaft body 12.

[0062] In the pressure adjustment unit 200, as shown in FIG. 15, after the roller 34 disengages from the stepped portion 40d of the fan plate 40, the roller 34 remains in contact with the outer periphery (second arc portion 40c) of the fan plate 40 and the fan plate 40 rotates. As shown in FIG. 17, the blade 13 opens the ventilation area 11.

[0063] Here, when comparing the distances R1 and R2 from the axis center 12c to the second arc portion 40c shown in FIG. 15, the distance R1 in the arc portion near the stepped portion 40b between the first arc portion 40a and the second arc portion 40c is smaller than the distance R2 in the arc portion near the stepped portion 40d. Thus, in the process of the fan plate 40 rotating in the direction of opening the blade 13 (clockwise around the shaft body 12 in FIG. 15) with the roller 34 in contact with the second arc portion 40c, the roller 34 moves in the direction approaching the shaft body 12 (the direction in which the spring 31 contracts).

[0064] Therefore, as shown in FIGS. 15(a) and 17, after the roller 34 at the tip 30a of the link arm 30 disengages from the stepped portion 40d of the fan plate 40 and transitions to the states shown in FIGS. 15(b) and 18, the contraction force of the spring 31 (the contraction force toward the shaft body 12) is applied to the roller 34, smoothing the rotation of the fan plate 40 and enabling the opening operation of the blade 13 to be performed smoothly.

[0065] On the other hand, when the differential pressure between the front side and the back side of the blade 13 becomes below a predetermined value, the blade 13 in the open state shown in FIG. 18 returns to the closed state shown in FIG. 17 due to its own weight. In this process, the fan plate 40 transitions from the state shown in FIG. 15(b) to the state shown in FIG. 15(a). In this process, the contraction force of the spring 31 (the contraction force toward the shaft body 12) is applied to the roller 34, braking the rotation of the fan plate 40, suppressing a rapid rotation of the blade 13 in the closing direction, and enabling the closing operation to be performed softly.

[0066] The structure, functions, etc. of other parts of the pressure adjustment unit 200 are the same as those of the pressure adjustment unit 100 described above.

[0067] Note that the pressure adjustment units 100 and 200 described with reference to FIGS. 1 to 8 are examples of the pressure adjustment unit according to the present invention, and the pressure adjustment unit according to the present invention is not limited to the pressure adjustment units 100 and 200 described above.

Industrial Applicability

[0068] The pressure adjustment unit according to the present invention can be widely used in industrial fields such as the construction industry, for example, as a material for adjusting the differential pressure between a region pressurized to a positive pressure state and an adjacent region in a building when a fire occurs in the building.

Explanation of Reference Numerals

[0069] 1 Partition means 2 Opening 10 Frame 10a Upper surface part 10b Lower surface part 10c, 20 Vertical part 11 Ventilation region 12 Shaft body 12c Axis center 13 Blade 13a, 24a Upper part 13b, 24b Lower part 13c Fixed bolt 13d Weight 14L, 14R Side members 15, 40 Fan plate 15c Large arc part 15b, 40b, 40d Step part 15d Small arc part 16, 25a, 26, 27, 33, 34a Support shaft 17, 30 Link arm 17a, 30a Tip part 17b, 30b Base end part 18 Mounting part 18a, 35 Through hole 19 Bush 20a Rear edge part 21 Guide member 21a Upright surface 21b Horizontal surface 21c Induction surface 21d Buffer member 22 Stopper 24 Guide vane 25, 34 Roller 28 Link 29 Plunger shaft 31 Spring 32 Locking member 36 Keep solenoid 37 Suction plate 40a First arc portion 40c Second arc portion 40R, Re Radius of curvature 100, 200 Pressure adjustment unit E Virtual axis center R1, R2 Distance W, Z Airflow

Claims

1. A pressure adjustment unit that is attached to an opening formed in partitioning means for partitioning a space inside a building and opens when a preset pressure difference is reached, comprising: a frame body; a blade rotatably attached to the frame body via a shaft for opening and closing a ventilation area surrounded by the frame body; a fan plate attached to the shaft protruding from a side member of the frame body; a link arm rotatably attached to the side member via a support shaft and capable of rotating forward and backward, with the tip end side coming into contact with and separating from the outer periphery of the fan plate as it rotates forward and backward; a keep solenoid connected to the base end side of the link arm via a link, and performing an operation of advancing and retracting the base end of the link arm to bring the tip end side of the link arm into contact with and separate from the outer periphery of the fan plate; an adsorption plate fixed to the side member near the tip of the plunger shaft of the keep solenoid, the adsorption plate capable of adsorbing the tip of the plunger shaft by magnetic force; A pressure adjustment unit provided with a step portion on the outer periphery of the fan plate that blocks the rotation of the fan plate by bringing the tip end side of the link arm into contact by the holding action of the keep solenoid when the blade closes the ventilation area.

2. A pressure adjustment unit that is attached to an opening formed in partitioning means for partitioning a space inside a building and opens when a preset pressure difference is reached, comprising: a frame body; a blade rotatably attached to the frame body via a shaft for opening and closing a ventilation area surrounded by the frame body; a fan plate attached to the shaft protruding from a side member of the frame body; a link arm rotatably attached to the side member via a support shaft and capable of rotating forward and backward, with the tip end side coming into contact with and separating from the outer periphery of the fan plate as it rotates forward and backward; a spring suspended between a portion of the link arm located between its tip end and the support shaft and a locking member provided on the side member of the frame body, the spring biasing the tip end of the link arm in a direction to contact the outer periphery of the fan plate; When the blade closes the ventilation area, a step portion is provided on the outer periphery of the fan plate that blocks the rotation of the fan plate by bringing the tip end side of the link arm into contact by the biasing force of the spring. A pressure adjustment unit provided with a first arc portion centered on the axis of the shaft body and a second arc portion centered on a virtual axis offset from the axis of the shaft body and having a different curvature from that of the first arc portion in a region where the tip end side of the link arm abuts when the fan plate rotates on the outer periphery of the fan plate.

3. The pressure adjustment unit according to claim 1 or 2, wherein when a predetermined differential pressure is generated between the front side and the back side of the blade in a state where the ventilation region is closed, the blade is opened by the rotational torque applied to the blade by the differential pressure.

4. The pressure adjustment unit according to any one of claims 1 to 3, provided with a guide vane covering the upstream end portion of the blade.

Images