JP4450178B2 - Differential pressure damper device - Google Patents

Description

  The present invention relates to a differential pressure damper device that is arranged on a wall that separates two spaces and suppresses the pressure difference between the two spaces to a predetermined range, and in particular, opens even a minute pressure difference to move gas between spaces more quickly. The present invention relates to a differential pressure damper device.

  As a part of the air conditioning equipment, it is arranged on the wall that divides the two spaces, etc., and when the gas pressure in one space exceeds the set value and becomes higher than the other space, it is open based on the pressure difference A differential pressure damper that relaxes the pressure difference by letting a gas with a high relative pressure flow out from one space to the other space, maintains the pressure in one space substantially constant, and prevents the backflow of gas from the other space Various devices have been conventionally used depending on applications. Among them, a slide-type differential pressure damper device has been proposed as being suitable for use in a specific place such as a clean room. An example of this conventional differential pressure damper device is described in Japanese Patent Publication No. 1-44973, which is shown in FIG. FIG. 5 is a longitudinal sectional view of a conventional differential pressure damper device.

  5, the conventional differential pressure damper device includes an outer box 101 that is attached to a mounting hole provided in a wall 50, and a seat plate 102 that is inclined to form an inclined opening in the outer box 101. A support member 103 fixed in the vicinity of the seat plate 102 in the outer box 101, and a base end fixed to the support member 103, penetrating the inclined opening, and inclined upward from the indoor side to the outdoor side with respect to the horizontal direction. The guide shaft 104 is provided with a guide shaft 104 and a blade 105 which is slidably engaged with the guide shaft 104 and moves in the direction of the guide shaft 104. The blade 105 has a constant return force due to its own weight. The inclined opening is closed.

In this conventional differential pressure damper device, the inclined opening is closed by the weight of the blade 105, and when the pressure in the room slightly exceeds the set value, the blade 105 is immediately opened to release the increased pressure to the outside of the room. It can respond quickly to changes in the air volume, and can quickly open and close the opening in response to minute pressure fluctuations in the room, allowing constant control of the room pressure.
Japanese Examined Patent Publication No. 1-44973

  The conventional differential pressure damper device is configured as described above. In order to smoothly move the blade 105 on the single guide shaft 104 in response to the pressure fluctuation, in sliding between the blade 105 and the guide shaft 104, It is necessary to keep the frictional resistance very small, and a highly accurate linear motion bearing is disposed between the blade 105 and the guide shaft 104, and the surface accuracy of the outer periphery of the guide shaft 104 is increased to reduce the resistance. It is a mechanism. However, the bearing used has a complicated structure in order to realize smooth operation, and there is a problem that the cost of the entire apparatus becomes high in combination with the necessity of precision machining on the surface of the guide shaft 104. It was.

  The present invention has been made in order to solve the above-described problems. Although the structure is simple, the damper blades can be smoothly moved in response to pressure fluctuations between the two spaces to reliably control the inflow and outflow of air. Another object of the present invention is to provide a differential pressure damper device that can suppress a pressure difference to a set pressure or less.

The differential pressure damper device according to the present invention is disposed on a wall that separates two adjacent spaces, and when the pressure difference between one space and the other space is not more than a predetermined set value, the two spaces are not communicated. While in the closed state, when the pressure difference exceeds the set value, the differential pressure damper opens and connects the two spaces, allowing the gas in the space to move from the one space to the other space. In the apparatus, at least a hollow substantially cylindrical portion through which the gas passes, and a damper frame body that is fitted in a hole provided in the wall and an opening at the other end of the damper frame body are provided. A damper that has a size that can be closed and is formed of a substantially plate-like body whose central portion protrudes in a convex shape, and is disposed at the other space side end of the damper frame with the protruding side facing the other space side. Four links combined with blades and parallel crank mechanism Formed in wood, with attached as arranged along the inner peripheral surface on the damper frame upper inner peripheral surface of one link member as still clause, wherein the other link member which extends parallel with said one link member other The damper blade body is fixed to the space-side end of the arm, and the damper blade body is movably supported while maintaining the state parallel to the end face of the damper frame body, and the damper frame body and the damper of the arm portion. The center of gravity position is disposed on a predetermined link member that is not attached to the blade body so that the position of the center of gravity can be adjusted, and the damper blade body is positioned inside the damper frame body with the damper frame body other end side opening closed , and And a balance weight that positions the center of gravity of the entire movable part combined with the arm part excluding one link member and the damper blade body closer to the other space than the arm part.

  As described above, in the present invention, the arm portion that supports the damper blade body forms a parallel crank mechanism, and the direction of the damper blade body is always parallel to the opening surface of the damper frame body. When the pressing force exceeds the closing force of the damper blade body based on the weight of each part etc., the damper blade body moves to the open side without changing its orientation while being supported by the arm part, and between the damper frame body and the damper blade body The opening can be secured all around the blade body, and when the air-conditioning gas flows out through the opening, the gas can be efficiently moved with less resistance, and the differential pressure between the spaces can be quickly brought within the set pressure. In addition to being able to adjust, the sliding part in the arm part is dispersed for each of the coupling parts of each link member, so that it is not easily affected by frictional resistance and can be moved smoothly without using complicated bearings. Simplified Hakare and cost can be reduced for the entire device. In addition, since the displacement of the damper blade body can be sufficiently secured even if the arm portion is reduced in the dimension of the link member parallel to the thickness direction of the frame body, it is desirable that the arm portion accommodates at least the entire arm portion when the blade body is closed. The required dimensions in the thickness direction of the frame body can be suppressed, and it is possible to cope with various places by reducing the dimensional restrictions in installing on the wall. Further, the center of gravity of each member movable with respect to the arm operation center position is biased toward the other space while the damper blade is in contact with the damper frame, and the damper blade is further increased by the weight of each member. By generating a force to advance to one space side, the damper blade body not only abuts against the damper frame body, but is always pressed against the damper frame body side to ensure close contact, It is possible to prevent the backflow to the high-pressure side space by preventing gas leakage between the two.

  Further, in the differential pressure damper device according to the present invention, the balance weight is protruded toward the other link member that is parallel to the predetermined link member while being inclined toward the one link member as necessary. The screw shaft is fixed to a predetermined link member, and the weight portion is screwed to the screw shaft so as to be axially movable.

  As described above, in the present invention, the balance weight disposed on the arm portion has a combination structure of the screw shaft inclined to the one link member side and the weight portion screwed to the screw shaft, and the weight portion on the screw shaft. By increasing the rate of change in the closing force of the damper blade body against the force to push the damper blade body against the degree of position adjustment, the opening pressure associated with the differential pressure of the damper blade body can be easily and quickly It can be adjusted and can respond appropriately to various pressure differential conditions.

  Hereinafter, a differential pressure damper device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a front view of a differential pressure damper device according to the present embodiment, FIG. 2 is a longitudinal sectional view of the differential pressure damper device according to the present embodiment, and FIG. 3 is a differential pressure damper device according to the present embodiment. FIG. 4 is an open state longitudinal sectional view of the differential pressure damper device according to the present embodiment.

  As shown in the drawings, the differential pressure damper device 1 according to the present embodiment includes a rectangular frame-shaped damper frame 2 disposed at a predetermined position of a wall 50 that separates two spaces 10 and 20, and this A damper blade body 3 that is disposed at the opening end of the damper frame 2 and opens and closes the opening by the pressure difference between the two spaces, and is attached to the damper frame body 2 and the damper blade body 3 to be attached to the damper frame body 2. On the other hand, an arm portion 4 that movably supports the damper blade body 3 and a balance weight 5 attached to a predetermined portion of the arm portion 4 are provided.

  The damper frame 2 is formed of a frame having a cylindrical portion having a square cross-sectional shape, and is configured to be fitted into a hole provided in a wall 50 that separates the two spaces 10 and 20. A mechanism for allowing air to pass from one space 10 to the other space 20 side in the frame body inner portion when the damper blade body 3 opens when the pressure difference between the two spaces 10 and 20 exceeds the set pressure. It is. On the contact surface of the damper blade body 3 of the damper frame 2, a packing 2a made of an elastic material that eliminates a minute gap between both members at the time of contact is disposed.

  The damper blade body 3 is formed of a substantially rectangular plate-like body having a size capable of closing the opening of the damper frame 2 facing the other space 20 and having a central portion protruding in a convex shape. 2 is attached to the end of the other space 20 close to the other space 20 with the projecting side facing the other space 20, and can be freely opened and closed via the arm portion 4, and the damper frame body is centered in the contact state with the damper frame body 2. The opening of the damper frame 2 is opened and closed in accordance with the pressure difference between the two spaces 10 and 20 while being coincident with the center of 2. In addition, the outer peripheral edge part of the damper blade body 3 has a configuration in which a predetermined length is raised on the side opposite to the protruding direction of the central part. The damper blade body 3 has a structure that receives pressure from one space portion 10 side and moves from the contact state with the damper frame body 2 to the other space 20 side. It is a mechanism that allows only the outflow to the other space 10 side through.

  The arm portion 4 is formed by four sets of link members 4a, 4b, 4c, and 4d combined as a parallel crank mechanism, and the short link member 4a is attached to the damper frame 2 as a stationary node of the mechanism. The damper blade body 2 is disposed in a suspended state while the other link member 4d parallel to the link member 4a extends its end portion further from the connecting portion with the link member 4c, and the damper blade body 3 The damper blade body 3 is fixed at the center of the rear side, and the damper blade body 3 is moved in a direction substantially parallel to the center axis of the damper frame body 2, that is, the damper blade body 3 is always moved in a direction parallel to the opening end surface of the damper frame body 2. It is the structure which supports it.

  The link member 4a serving as a stationary node in the arm portion 4 is supported by the damper frame 2 via two position adjustment members 4e and 4f, and a plurality of position adjustment members 4e and 4f provided on each of the position adjustment members 4e and 4f. By adjusting each of the adjustment screws 4g and 4h to change the positional relationship between the position adjustment members 4e and 4f, the position adjustment and the inclination adjustment of the link member 4a with respect to the damper frame 2 can be performed. It is difficult to obtain a uniform contact state on the entire circumference when the outer periphery of the damper blade body 3 and the opening of the other end of the damper frame 2 are closed in terms of mounting defects in the finishing accuracy of the wall 50 and work accuracy. By adjusting 4a, the positional relationship between the damper blade body 3 and the damper frame body 2 can be finely adjusted, so that the sealing performance can be secured. The adjustment is a mechanism in which the lateral position adjustment is performed with the adjustment screw 4g and the inclination adjustment is performed with the adjustment screw 4h.

  The balance weight 5 includes a screw shaft 5a whose end is fixed to a long link member 4b closer to the space 10 in the arm portion 4, and a weight portion 5b screwed to the screw shaft 5a. is there. The screw shaft 5a of the balance weight 5 protrudes in a direction inclined toward the link member 4a side from the position near the link member 4d of the link member 4b, and as the screw shaft 5a screwing position of the weight portion 5b is changed, The distance of the weight part 5b with respect to the link member 4a of the arm part 4 is arrange | positioned so that a change is possible. Even if the balance weight 5 moves in accordance with the operation of the damper blade body 3 or the arm portion 4, the center portion of the damper blade body 3 protrudes toward the other space, so there is no contact with the damper blade body 3. It does not hinder the opening and closing of the damper blade body 3.

  The position of the center of gravity of the entire movable part including the arm part 4 excluding the link member 4a, the damper blade body 3, and the balance weight 5 is the other space than the position of the operation center of the arm part 4 (center of the link member 4a that is a stationary node). Accordingly, even when the damper blade 3 is in contact with the damper frame 2, a force is applied to further toward the one space 10 in the closing direction. Thus, the damper blade body 3 can be brought into close contact with the damper frame body 2 to reliably close the opening.

  Next, the operation of the differential pressure damper device based on the above configuration will be described. When the differential pressure between the two spaces 10 and 20 separated by the wall 50 to which the differential pressure damper device is attached exceeds the set pressure, the damper blade body 3 based on the weight of each member is pressed against the damper frame body 2. The opening pressure that pushes the damper blade body 3 with respect to the closing force overcomes the pressure difference, and the damper blade body 3 at the end of the damper frame body 2 is pushed toward the other space 20 side by the gas pressure in the high-pressure side space 10. An opening is generated between the damper frame 2 and the damper blade body 3.

  When the opening is generated, the air in the space 10 enters the damper frame 2 and flows out between the damper blade body 3 and the damper frame 2 to the space 20. When the damper blade body 3 is opened, the airflow that strikes the back surface of the damper blade body 3 out of the airflow from the space 10 side to the other space 20 side is further received by the standing part of the outer periphery of the blade body, and the dynamic pressure from the airflow Can be effectively used for opening the damper blade body 3, and the damper blade body 3 can be smoothly moved to the other space side to sufficiently secure an opening between the damper frame body 2 and the damper blade body 3.

  On the other hand, when the differential pressure between the two spaces drops below the set pressure due to the outflow of air from the high-pressure side space 10 to the low-pressure side space 20, the damper blade body 3 is lowered to close the opening, and the two spaces 10, 20 again. Becomes isolated. The damper blade body 3 is pressed against the damper frame 2 by a force based on the weight of the movable part, and unless the pressure in the space 10 exceeds the set pressure with respect to the space 20, the damper blade body 3 may freely open or vibrate when contacting. Absent. Further, even when the pressure in the other space 20 becomes higher than that in the space 10 due to a sudden change in the pressure state, and a situation in which a backflow is likely to occur is generated, when the damper blade body 3 is closed, the damper blade from the other space 20 side. The air flow that pushes the body 3 flows along the protruding shape of the damper blade body 3 and moves away from the outer periphery in the extending direction, and the air flow hardly flows into the opening between the damper frame body 2 and the damper blade body 3. Therefore, there is very little risk of inflow of gas that becomes a reverse flow before the damper blade body 3 is closed.

  When adjusting the set pressure at which the damper blade body 3 is moved and opened, the weight portion 5b of the balance weight 5 is screwed with respect to the screw shaft 5a to change the axial position, and the central portion of the movement of the arm portion 4 The distance of the weight portion 5b with respect to the link member 4a is changed, and the load portion of the weight portion 5b is adjusted in the combined force around the link member 4a that attempts to close the damper blade body 3. In this case, the load around the link member 4a increases as the weight portion 5b is positioned further downward, that is, away from the link member 4a, and the resistance force (reaction force) to the force to be opened increases. That is, the set pressure at the time of opening becomes a higher value. By adjusting the position of the weight portion 5b with respect to the link member 4a, the degree of change in the closing force due to the position adjustment is large, and the set pressure can be easily changed.

  As described above, when the pressure applied to the damper blade body 3 due to the differential pressure exceeds the closing force of the damper blade body 3 based on the weight of each member, the differential pressure damper device according to the present embodiment 3 moves to the open side without changing its orientation while being supported by the arm portion 4, and the opening between the damper frame 2 and the damper blade body 3 can be secured around the entire blade body, and air conditioning through the opening The gas can be efficiently moved with less resistance when the working gas flows out, the differential pressure between the spaces can be quickly adjusted within the set pressure, and the sliding portions in the arm portion 4 can be linked to the link members 4a and 4b. By being dispersed at each of the plurality of coupling portions 4c and 4d, it is difficult to be influenced by frictional resistance, and it can be moved smoothly without using a complicated bearing or the like, and the structure can be simplified and the cost can be reduced. Further, even when the arm portion 4 is reduced in the dimensions of the link members 4a and 4d parallel to the thickness direction of the damper frame 2, the amount of displacement of the damper blade body 3 can be sufficiently secured. The required dimensions in the thickness direction of the damper frame 2 that are desirably large enough to accommodate the whole can be suppressed, and the dimensional restrictions in the installation on the wall 50 can be reduced to accommodate various locations.

  In the differential pressure damper device according to the above-described embodiment, the damper frame 2 is formed to have a rectangular opening cross-sectional shape. However, the present invention is not limited to this, and the damper frame 2 is not limited to other open cross-sections such as a rectangle or a circle. It can also be set as the structure formed as a frame-shaped body of a shape. Further, the damper blade body 3 can also be configured to be formed in another outer shape such as a rectangle or a circle in accordance with the opening cross-sectional shape of the damper frame 2.

1 is a front view of a differential pressure damper device according to an embodiment of the present invention. 1 is a longitudinal sectional view of a differential pressure damper device according to an embodiment of the present invention. It is a damper frame attachment state explanatory drawing of the arm part in the differential pressure damper apparatus which concerns on one embodiment of this invention. It is an open state longitudinal cross-sectional view of the differential pressure damper apparatus which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view of the conventional differential pressure damper device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Differential pressure damper apparatus 2 Damper frame 2a Packing 3 Damper blade body 4 Arm part 4a, 4b, 4c, 4d Link member 4e, 4f Position adjustment member 4g, 4h Adjustment screw 5 Balance weight 5a Screw shaft 5b Weight Part 10, 20 Space 50 Wall 101 Outer box 102 Seat plate 103 Support member 104 Guide shaft 105 Blade

Claims (2)

When the pressure difference between one space and the other space is less than a predetermined set value, the two spaces are in a closed state in which the two spaces are not in communication. In the differential pressure damper device that allows the movement of the gas in the space from the one space to the other space, when the set value is exceeded, the two spaces are brought into communication with each other,
A damper frame that has at least a hollow, generally cylindrical portion through which the gas passes, and is fitted in a hole provided in the wall; and
The damper frame is formed of a substantially plate-like body having a size capable of closing the opening on the other end side of the damper frame, and having a central portion protruding in a convex shape. A damper blade disposed toward the space side;
It is formed of four link members combined as a parallel crank mechanism, and is attached to the damper frame upper inner peripheral surface as an arrangement along the inner peripheral surface with the one link member as a stationary node , and the one link member An arm portion fixed to the other space side end of another parallel link member, and supporting the damper blade body movably while maintaining the damper blade body parallel to the damper frame opening end surface; ,
Adjustably disposed the center of gravity located at a predetermined link member which is not attached to the damper frame and a damper blade of the arm portion, the damper in a state in which the damper blade body is closed damper frame end side opening And a balance weight that is located inside the frame body and that positions the center of gravity of the entire movable portion combined with the arm portion and the damper blade body excluding the one link member closer to the other space than the arm portion. Differential pressure damper device. The differential pressure damper device according to claim 1,
A screw shaft that is fixed to the predetermined link member in a state of protruding toward another link member that is parallel to the predetermined link member while the balance weight is inclined toward the one link member; and the screw shaft A differential pressure damper device comprising a weight portion screwed so as to be axially movable.

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