JP7587101B2 - Door structure and airtightness test method - Google Patents

Description

The present invention relates to a door structure whose airtightness performance can be measured, and an airtightness testing method for measuring the airtightness performance of a door.

Conventionally, a door structure and an airtightness test method that can measure the airtightness performance of an airtight door installed in a building or the like are known (see, for example, Patent Document 1). The door structure described in Patent Document 1 includes a panel-shaped airtight cover body that forms a space between the surface of the airtight door. The door structure is configured to measure the airtightness performance of the airtight door by sending a predetermined amount of air into the space while the airtight door is sealed and measuring the amount of air sent into the space.

JP 2009-216434 A

In the door structure described in the above patent document, the space between the entire airtight door and the airtight cover body is configured as an airtight chamber. When configured in this way, air may leak from parts of the airtight door other than the packing, such as the door body, frame, and airtight cover body. In this way, when the amount of air leaking from parts other than the packing becomes large, it is difficult to measure the airtight performance of the airtight door with high accuracy. In particular, at the site where the airtight door is assembled, it is difficult to ensure airtightness in parts other than the packing, making it difficult to accurately measure the airtight performance.

The present invention was made in consideration of the above-mentioned circumstances, and the problem that the present invention aims to solve is to provide a door structure and an airtightness testing method that can improve the measurement accuracy of airtightness performance by preventing or reducing the leakage of air and other substances from places other than the packing.

To solve the above problems, the present invention provides a door structure configured as follows:

(1) A door structure including a frame having an opening, and a door body provided on the frame so as to be displaceable between an open position that opens the opening and a sealed position that seals the opening from one side of the frame, wherein the frame is provided with a pair of guide rails in the vicinity of the opening, the door body is provided so as to be slidable between the open position and the sealed position along the pair of guide rails, an annular packing is provided on one of the periphery of the opening and the peripheral edge of the door body, and an annular abutment portion is provided on the other of the periphery of the opening and the peripheral edge of the door body, the annular airtight chamber is formed along the packing between the packing and the abutment portion, and the airtight chamber has a pressure measurement port that is connected to an internal space of the airtight chamber. and a flow measurement port, at least one of the pressure measurement port and the flow measurement port is provided so as to penetrate the frame body, a pressure gauge which measures the air pressure in the airtight chamber can be connected to the pressure measurement port, and a compressor which causes gas to flow into the airtight chamber and a flow meter which measures the inflow amount of the gas into the airtight chamber can be connected to the flow measurement port, and with the door body placed in a sealed position, the compressor causes the gas to flow into the airtight chamber so that the air pressure in the airtight chamber measured by the pressure meter is constant for a predetermined period of time, and by estimating the amount of gas leaking from a portion of the opening that is sealed by the door body within the predetermined period of time, the airtight performance of the door body at the opening can be measured.

(2) The door structure described in (1), in which the packing has two ridges that ridge toward the abutment portion and circumferentially protrude, the surface of the abutment portion facing the packing is formed in a flat shape, and the two ridges of the packing abut against the abutment portion, so that the groove between the two ridges and the abutment portion form the airtight chamber.

(3) The door structure described in (1), in which the abutment portion is formed in a substantially U-shape in a cross-sectional view perpendicular to the circumferential direction, the groove shape is arranged toward the packing, the surface of the packing facing the abutment portion is formed in a flat shape, and the abutment portion and the packing abut against each other, whereby the groove shape and the packing form the airtight chamber.

(4) The door structure according to any one of (1) to (3 ) , wherein a guide roller is provided on the side of the pair of guide rails in the door body, the guide roller being rotatable inside the guide rail around an axis extending toward the guide rails, and when the door body seals the opening, the guide rail guides the guide roller to displace the door body toward the frame body, whereby the other of the guide rollers presses the packing.

(5) The door structure described in (4), in which the pair of guide rails are provided along the vertical direction of the frame, the door body is provided so as to be able to rise and fall along the pair of guide rails, and the door body is lowered to seal the opening.

To solve the above problems, the present invention provides an airtightness testing method as follows:

(6) An airtightness testing method for measuring airtightness performance of a door body at an opening by using a mock door including a self-supporting frame body with an opening and a door body provided on the frame body so as to be displaceable between an open position where the opening is opened and a sealed position where the opening is sealed from one side of the frame body, the mock door having a pair of guide rails provided on the frame body near the opening, the door body being provided so as to be slidable between the open position and the sealed position along the pair of guide rails, an annular packing is provided on one of the periphery of the opening and the peripheral edge of the door body, and an annular abutment portion is provided on the other of the periphery of the opening and the peripheral edge of the door body, the annular abutment portion being in contact with the entire circumference of the packing when the door body seals the opening, and the packing and the abutment portion and a sealing member for sealing the opening of the door body, the sealing member being configured to seal the opening of the door body and configured to seal the opening of the door body, the sealing member being configured to seal the opening of the door body, the sealing member being configured to seal the opening of the door body, and the sealing member being configured to seal the opening of the door body, ...

The door structure of the present invention described above has the following advantages:

According to the configuration of (1), by forming an annular airtight chamber along the packing between the packing and the abutment portion, it is possible to reduce air leakage from other than the packing, thereby improving the measurement accuracy of the airtight performance.

The configuration of (2) allows for the formation of an airtight chamber along the packing with a simple configuration.

The configuration of (3) allows for the formation of an airtight chamber along the packing with a simple configuration.

The configuration of (4) makes it possible to seal the opening of the frame body with the door body using a simple configuration.

According to the configuration of (5), the door body is lowered using its own weight, making it possible to seal the opening of the frame body with a simpler configuration.

The airtightness testing method according to the present invention has the following advantages:

According to the configuration of (6), by forming an annular airtight chamber along the packing between the packing and the abutment portion, it is possible to reduce air leakage from other than the packing, thereby improving the measurement accuracy of the airtight performance.

FIG. 4 is a front view showing the door structure when the lift door is open. FIG. 4 is a front view showing the door structure when the lift door is closed. 3 is a cross-sectional view taken along line AA in FIG. 2. 3 is a cross-sectional view taken along line BB in FIG. 2. 3 is a cross-sectional view taken along line CC in FIG. 2 . Horizontal cross-sectional view showing the structure around the packing. 4A and 4B are horizontal cross-sectional views showing the packing before and after an airtight chamber is formed. 13A and 13B are horizontal cross-sectional views showing a packing in a state before and after an airtight chamber is formed in another embodiment.

The following describes a door structure 1 according to one embodiment of the present invention and an airtightness test method performed on the door structure 1, with reference to Figures 1 to 7. As shown in Figures 1 to 4, the door structure 1 comprises a frame 2 and a door body 20. In the following description, the right side in Figures 1 and 2 is the right side of the door structure 1, and the left side in Figure 3 is the front of the door structure 1.

As shown in Figures 1 to 3, the frame body 2 is configured to be self-supporting, and specifically, the frame body 2 is mainly composed of multiple H-shaped steels connected by connecting members such as bolts and nuts, or by welding. More specifically, the frame body 2 is configured by combining a base frame 3a, a vertical frame 3b, a horizontal frame 3c, an opening vertical frame 3d, an opening horizontal frame 3e, a connecting frame 3f, a first reinforcing frame 3g, and a second reinforcing frame 3h, and a brace 4. Note that the frame body may be configured with an opening, and may be configured with a structure other than a combination of H-shaped steels, for example, an opening provided in a wall.

As shown in Figures 1 and 2, five base frames 3a are placed on the floor at the bottom of the frame body 2 with their longitudinal direction facing forward and backward. Two vertical frames 3b are arranged in a line up ... line in a line up in line in a line up in line in a line up in line in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up in line up

The upper end faces of the front and rear vertical frames 3b and the opening vertical frame 3d are connected by a horizontal frame 3c with its longitudinal direction facing left and right. In addition, the upper ends and vertical middle parts of the two vertical frames 3b and the opening vertical frame 3d arranged in a row are connected by a connecting frame 3f.

The lower ends and vertical middle parts of the opening vertical frames 3d, 3d are connected to each other by the opening horizontal frame 3e. In addition, the top surface of the central base frame 3a and the central bottom surface of the lower opening horizontal frame 3e, the central top surface of the lower opening horizontal frame 3e and the central bottom surface of the upper opening horizontal frame 3e, and the central top surface of the upper opening horizontal frame 3e and the central bottom surface of the horizontal frame 3c are each connected by the central frame 3m.

As shown in FIG. 3, the rear end of the base frame 3a is connected to the horizontal frame 3c and the first reinforcing frame 3g. The center of the first reinforcing frame 3g is connected to the vertical frame 3b, the opening vertical frame 3d, or the opening horizontal frame 3e located in front of it and the second reinforcing frame 3h.

As shown in FIG. 1, a rectangular opening 2a is formed on the front side of the frame 2 by two opening vertical frames 3d and two opening horizontal frames 3e. In the frame 2, a ring-shaped elastic resin packing 2p is provided around the opening 2a on the front sides of the opening vertical frames 3d and the opening horizontal frames 3e (see FIG. 4 to FIG. 7). In addition, as shown in FIG. 6 and FIG. 7, a ring-shaped abutment portion 28 made of a plate material is attached to the peripheral portion on the rear side of the door body 20. In this embodiment, the surface of the abutment portion 28 on the side of the packing 2p is formed in a flat shape.

As shown in Figures 7(a) and (b), when the door body 20 closes the opening 2a, the packing 2p comes into contact with the contact portion 28 on the rear surface of the door body 20. At this time, the packing 2p and the contact portion 28 come into contact around the entire circumference. It is also possible to configure the rear surface of the door body 20 itself as the contact portion. It is also possible to provide the packing 2p on the peripheral portion of the rear surface of the door body 20, and provide the contact portion 28 around the opening 2a.

A door body 20 is provided on the frame body 2. The door body 20 is configured to be displaceable between an open position (see FIG. 1) in which the opening 2a is open and a sealed position (see FIG. 2) in which the opening 2a is sealed from the front side of the frame body 2. The door structure 1 measures the airtightness performance of the door body 20 at the opening 2a in a state in which the door body 20 seals the opening 2a. The front surface of the frame body 2 in the door structure 1 according to this embodiment is covered by a cover member 5 except for the portion in front of the opening 2a.

As shown in Figures 1 and 2, the door structure 1 is configured such that the door body 20, which is located in an open position at the top, moves down to a sealed position, thereby sealing the opening 2a. Note that the displacement configuration of the door body 20 in the door structure 1 is not limited to a lifting door in which the door body 20 moves up and down, and it is also possible, for example, for the door body 20 to be configured to slide horizontally.

The door body 20 is a member that is thick in the front-rear direction and is constructed by combining multiple frame members and plate members. As shown in Figures 1 and 2, the door body 20 is provided between a pair of guide rails 11, 11 erected on both the left and right sides of the door body 20, and is provided so as to be slidable in the up-down direction along the guide rails 11, 11. The guide rails 11, 11 are provided along the up-down direction near both sides of the opening 2a in the frame body 2 (in front of the opening vertical frames 3d, 3d).

As shown in Figures 5, 7, and 8, the guide rails 11, 11 have a groove shape 11a formed on the surfaces facing each other. Guide rollers (open side guide roller 26U and closed side guide roller 26D) extending from the door body 20 are inserted into the groove shape 11a.

As shown in FIG. 5, in this embodiment, two protrusions 13a and 13b for guiding the guide rollers 26U and 26D are provided on the lower side of the front surface (the surface farther from the frame body 2) of the inner peripheral surface of the groove shape 11a of the guide rail 11.

Two guide rollers 26U and 26D are provided extending outward from both the left and right sides of the door body 20 on the outer sides of the guide rails 11/11 (on both the left and right sides) along the up-down direction, which is the sliding direction of the door body 20. In detail, on the outer surface of the door body 20, the opening side guide roller 26U is provided on the upper side, which is the side along which the door body 20 slides when opening the opening 2a, in the sliding direction of the door body 20. Similarly, the closing side guide roller 26D is provided on the lower side, which is the side along which the door body 20 slides when closing the opening 2a, in the sliding direction of the door body 20.

The guide rollers 26U and 26D are rotatable inside the guide rails 11/11 (inside the groove shape 11a) around the axis of the open side rotation shaft 25U and the closed side rotation shaft 25D that extend toward the guide rails 11/11. As a result, when the door body 20 slides along the guide rails 11/11, the guide rollers 26U and 26D rotate along the groove shape 11a of the guide rails 11/11 (more specifically, the front and rear surfaces of the groove shape 11a). The closed side guide roller 26D is formed with a smaller diameter than the open side guide roller 26U.

In addition, auxiliary rollers 27 are provided on the upper side of the open side guide roller 26U and the lower side of the closed side guide roller 26D on both the left and right sides of the door body 20. When the door body 20 slides along the guide rails 11, the auxiliary rollers 27 rotate along the groove shape 11a of the guide rails 11 (more specifically, the side surface of the groove shape 11a).

Right door pulley 30R and left door pulley 30L, which are movable pulleys, are arranged rotatably inside the door body 20. A rope r extending to the outside of the door body 20 is wound around the right door pulley 30R and the left door pulley 30L.

A pair of fixed pulleys, the second fixed pulley P2 and the third fixed pulley P3, are fixed above the right door pulley 30R and the left door pulley 30L on the frame body 2. Both ends of the rope r, sandwiching the left and right door pulleys 30R and 30L, are wound around the second fixed pulley P2 and the third fixed pulley P3, respectively.

As shown in Figure 2, the rope r is wound around the first fixed pulley P1 on one end side (right side in Figure 2) of the second fixed pulley P2, and one end is further connected to an electric winch M provided on the frame body 2. The rope r is wound around the fourth fixed pulley P4 on the other end side (left side in Figure 2) of the third fixed pulley P3, and the other end is further connected to a manual winch H provided on the frame body 2. The manual winch H is locked so that it does not rotate under normal conditions (when the electric winch M is used as the main driving source).

In the door structure 1 configured as described above, the electric winch M drives the door body 20 to raise and lower. Specifically, when the electric winch M winds up the rope r, the door body 20 is pulled upward. Conversely, when the electric winch M pays out the rope r, the door body 20 descends downward due to its own weight. In this way, in the door structure 1 according to this embodiment, the door body 20 is driven to raise and lower the door body 20, so that the door body 20 can open and close the opening 2a formed between the guide rails 11, 11.

In addition, in the door structure 1, the door body 20 can also be driven to rise and fall by the manual winch H, which is the second drive unit. Specifically, the user unlocks the manual winch H and turns the handle of the manual winch H. This winds up the rope r and pulls the door body 20 upward. Conversely, when the user turns the handle of the manual winch H in the opposite direction to unwind the rope r, the door body 20 descends downward due to its own weight. In this way, in the door structure 1 according to this embodiment, the door body 20 can open and close the opening 2a formed between the guide rails 11, 11 by the user turning the manual winch H to raise and lower the door body 20.

As described above, according to the door structure 1 of this embodiment, the door body 20 can be raised and lowered by driving the electric winch M and/or the manual winch H. Therefore, even if the door body 20 cannot be raised and lowered by the electric winch M due to a power outage or other reason, the door structure 1 can be opened and closed by raising and lowering the door body 20 with the manual winch H.

In the door structure 1 according to this embodiment, when the door body 20 closes the opening 2a, the guide rails 11 guide the guide rollers 26U and 26D to displace the door body 20 rearward, toward the frame 2. Specifically, as shown in FIG. 4, an opening-side protrusion 13a is provided on the front side (the surface farther from the frame 2) of the inner peripheral surface of the groove shape 11a of the guide rail 11 at a portion where the opening-side guide roller 26U is located when the door body 20 closes the opening 2a. Similarly, a closing-side protrusion 13b is provided on the front side of the inner peripheral surface of the groove shape 11a at a portion where the closing-side guide roller 26D is located when the door body 20 closes the opening 2a.

In the above configuration, when the door body 20 descends, the closed side guide roller 26D comes into contact with the closed side protrusion 13b, which guides the closed side guide roller 26D backward. At the same time, the open side guide roller 26U comes into contact with the open side protrusion 13a, which guides the open side guide roller 26U backward. In other words, the guide rollers 26U and 26D are simultaneously guided backward, and the door body 20 is displaced toward the frame 2 while descending. As a result, the abutment portion 28 of the door body 20 comes into contact with the packing 2p, and the peripheral portion of the door body 20 presses against the packing 2p (see Figures 7(a) and (b)).

As described above, in the door structure 1 according to this embodiment, when the door body 20 closes the opening 2a, the protrusions 13a and 13b on the guide rails 11 guide the guide rollers 26U and 26D to displace the door body 20 toward the frame 2. As a result, as shown in FIG. 8, the abutment portion 28 of the door body 20 is configured to press the packing 2p. In this manner, in this embodiment, the door body 20 and the periphery of the opening 2a can be brought into close contact with each other via the packing 2p and the abutment portion 28, so that airtightness or watertightness of the door structure 1 in the closed state can be ensured with a simple configuration.

In addition, in the door structure 1 according to this embodiment, the protrusions 13a and 13b provided on the inner peripheral surfaces of the front sides of the guide rails 11 guide the open side guide roller 26U and the closed side guide roller 26D, respectively. This allows the door body 20 to be displaced toward the frame 2 with a simple configuration, and the door body 20 and the periphery of the opening 2a to be tightly attached via the packing 2p and the abutment portion 28, making it possible to ensure airtightness or watertightness of the door structure 1 in the closed state.

The configuration for displacing the door body 20 towards the frame body 2 is not limited to the configuration using the protrusions 13a and 13b as described above. For example, a curved guide groove can be provided on the side of the door body 20, and a guide rod can be extended from the guide rails 11 toward the door body 20 and inserted into the guide groove. Then, by raising and lowering the door body 20, it is possible to displace the door body 20 along the shape of the guide groove.

The door structure 1 according to this embodiment is configured such that a pair of guide rails 11, 11 are provided in the frame 2 along the vertical direction, and the door body 20 descends to close the opening 2a. As a result, when the door body 20 closes the opening 2a, the door body 20 is lowered and displaced toward the frame 2 by utilizing its own weight, so that the door body 20 and the periphery of the opening 2a are tightly attached to each other via the packing 2p and the abutment portion 28. In other words, according to the door structure 1 according to this embodiment, it is possible to ensure airtightness or watertightness in the closed state with a simpler configuration than a configuration in which the door body slides horizontally.

In the door structure 1 according to this embodiment, as shown in FIG. 7(a), the packing 2p has two ridges (inner ridge Pa and outer ridge Pb) that ridge along the circumferential direction of the packing 2p toward the abutment 28. As shown in FIG. 7(b), when the door body 20 closes the opening 2a, the tips of the two ridges Pa and Pb on the packing 2p are pressed against the abutment 28, so that an airtight chamber Ch (shaded area shown in FIG. 7(b)) is formed by the groove Pc between the two ridges Pa and Pb and the abutment 28. That is, the airtight chamber Ch is formed in a ring shape along the packing 2p between the packing 2p and the abutment 28.

In this embodiment, the packing 2p is formed as an integral unit, so that the groove Pc is formed on the surface of the packing 2p. However, it is also possible to form the inner ridge Pa and the outer ridge Pb separately on the packing 2p and provide them around the opening 2a, and to use the recess formed between the inner ridge Pa and the outer ridge Pb as the groove Pc.

7(b), the airtight chamber Ch is provided with a pressure measurement port Hp that communicates with the internal space of the airtight chamber Ch through a through hole Rp that penetrates the opening vertical frame 3d, etc. In this embodiment, as shown in FIG. 1, the pressure measurement port Hp is provided on the rear surface of the front plate of the opening vertical frame 3d arranged on the front side, in the lower right part of the packing 2p when viewed from the front, as shown in FIG. Similarly, the airtight chamber Ch is provided with a flow rate measurement port Ha that communicates with the internal space of the airtight chamber Ch. In this embodiment, as shown in FIG. 1, the flow rate measurement port Ha is provided on the rear surface of the front plate of the opening vertical frame 3d arranged on the front side, in the upper left part of the packing 2p when viewed from the front. Note that the positions of the pressure measurement port Hp and the flow rate measurement port Ha are not limited to this embodiment, and they can also be arranged on the left and right sides or the upper and lower sides of the packing 2p.

As shown in Figures 3 and 5, a pressure gauge P that measures the air pressure in the airtight chamber Ch can be connected to the pressure measurement port Hp. In addition, a compressor C that flows gas into the airtight chamber Ch, a valve B that adjusts the amount of gas flowing into the airtight chamber Ch, and a flow meter F that measures the amount of gas flowing into the airtight chamber Ch can be connected to the flow measurement port Ha. In this embodiment, air is used as the gas. In addition, in this embodiment, other connection devices in the air flow path and a thermometer for calculating the effects of heat, etc. are not shown.

When performing an airtightness test on the door structure 1, first, as shown in Figures 3 and 5, a pressure gauge P is connected to the pressure measurement port Hp. In addition, a compressor C, a valve B, and a flow meter F are connected to the flow measurement port Ha. Then, as shown in Figures 6 and 7 (b), the door body 20 is placed in a sealed position to form an airtight chamber Ch, and gas is allowed to flow from the compressor C into the airtight chamber Ch while adjusting the valve B so that the air pressure in the airtight chamber Ch measured by the pressure gauge P is constant for a predetermined time. Then, based on the inflow amount measured by the flow meter F within a predetermined time, the outflow amount of gas from the airtight chamber Ch is measured. Furthermore, from the measured outflow amount of gas, the amount of gas leaking from the sealed portion of the opening 2a by the door body 20 is estimated, and it is determined whether this leakage amount is equal to or less than the allowable leakage rate for the airtight door. This makes it possible to measure the airtightness performance of the door body 20 at the opening 2a.

The door structure 1 according to this embodiment is configured to form an annular airtight chamber Ch along the packing 2p between the packing 2p and the abutment portion 28 as described above. In this manner, in this embodiment, by directly measuring the amount of gas leaking from the packing 2p, compared to the conventional configuration in which the space between the entire airtight door and the airtight cover body is an airtight chamber, the areas where air may leak are eliminated or reduced. In other words, the door structure 1 according to this embodiment can improve the measurement accuracy of the airtight performance by preventing or reducing air leakage from other than the packing 2p. In addition, compared to the conventional configuration, the door structure 1 according to this embodiment does not require a large-scale test device such as a cover member of the same scale as the door body 20, making it particularly suitable for a door structure with a large opening.

In addition, while it is difficult to ensure airtightness in areas other than the packing 2p at the site where the door structure 1 is assembled, the door structure 1 of this embodiment is more suitable because it makes it possible to accurately measure the airtight performance as described above. Furthermore, when the door structure 1 of this embodiment is used in combination with a conventional configuration in which the space between the entire airtight door and the airtight cover body is an airtight chamber, it becomes possible to measure and evaluate the amount of leakage from the packing 2p and the amount of leakage from areas other than the packing 2p. Furthermore, since the time required to stabilize the air pressure in the airtight chamber Ch can be shortened, the time required for the airtight test can also be shortened.

In the door structure 1, the packing and the abutment portion can be configured differently from the packing 2p and the abutment portion 28 in the above embodiment. Specifically, as shown in another embodiment in Figures 8(a) and (b), it is also possible to configure them as packing 102p and abutment portion 128. In this embodiment, the configuration other than the packing 102p and the abutment portion 128 is the same as in the above embodiment, so a detailed description will be omitted.

In this embodiment, a ring-shaped elastic resin packing 102p is provided around the opening 2a. In addition, a contact portion 128 is attached to the peripheral portion of the rear surface of the door body 20.

As shown in Figures 8(a) and (b), when the door body 20 closes the opening 2a, the packing 102p comes into contact with the contact portion 128 on the rear surface of the door body 20. At this time, the packing 102p and the contact portion 128 come into contact with each other all around. Note that, even in this embodiment, it is possible to provide the packing 102p on the peripheral portion of the rear surface of the door body 20 and provide the contact portion 128 around the opening 2a.

In this embodiment, the abutment portion 128 is formed in a substantially U-shape in a cross-sectional view perpendicular to the circumferential direction, and the groove shape is disposed toward the packing 102p. The surface of the packing 102p on the side of the abutment portion 128 is formed in a flat shape. Then, the abutment portion 128 and the packing 102p abut, and the tip edge of the abutment portion 128 is pressed into the packing 102p, so that an airtight chamber Ch (shaded portion shown in FIG. 8(b)) is formed by the groove shape of the abutment portion 128 and the packing 102p, as shown in FIG. 8(b). That is, even in this embodiment, the airtight chamber Ch is formed in a ring shape along the packing 102p between the packing 102p and the abutment portion 128.

In this way, in this embodiment, the door body 20 approaches the frame, so that the tip edge of the abutment portion 128 is pressed strongly against the packing 102p. For this reason, the configuration according to this embodiment is suitable for use in a hinged door in which the door body 20 can be rotated relative to the frame.

When conducting an airtightness test in this embodiment, as in the previous embodiment, gas is allowed to flow from compressor C into airtight chamber Ch while adjusting valve B so that the air pressure in airtight chamber Ch measured by pressure gauge P remains constant for a specified time. Then, the amount of gas flowing out from airtight chamber Ch is measured based on the inflow amount measured by flowmeter F within the specified time. Furthermore, from the measured amount of gas flowing out, the amount of gas leaking from the sealed portion of opening 2a by door body 20 is estimated, and it is determined whether this leakage amount is equal to or less than the allowable leakage rate for the airtight door. This makes it possible to measure the airtightness performance of door body 20 at opening 2a.

In the door structure according to the present embodiment, as described above, a ring-shaped airtight chamber Ch is formed along the packing 102p between the packing 102p and the abutment portion 128. In this way, by reducing air leakage from other than the packing 102p, it is possible to improve the measurement accuracy of the airtight performance of the door structure and shorten the time required for airtight testing compared to the conventional configuration in which the space between the entire airtight door and the airtight cover body is the airtight chamber. In this way, the door structure according to the present invention may be configured to form a ring-shaped airtight chamber between the packing and the abutment portion, and the configuration is not limited to the above embodiment or this embodiment.

In addition, using the door structure 1 according to this embodiment, a vibration experiment can be performed to measure the airtightness performance after an earthquake occurs. Specifically, the door structure 1 is placed on a vibration device, and the frame body 2 and the door body 20 are vibrated by the vibration device while the door body 20 is placed in the open position of the frame body 2. The door body 20 is then displaced to a sealed position to form an airtight chamber Ch, and the compressor C causes gas to flow into the airtight chamber Ch so that the air pressure in the airtight chamber Ch measured by the pressure gauge P is constant for a predetermined time. Then, based on the inflow amount measured by the flowmeter F within the predetermined time, the amount of gas leaking from the sealed portion of the opening 2a by the door body 20 is estimated. This makes it possible to measure the effect of the vibration applied by the vibration device on the airtight door.

1 Door structure 2 Frame
2a Opening 2p Packing
3a Base frame 3b Vertical frame
3c Horizontal frame 3d Open vertical frame
3e Opening side frame 3f Connecting frame
3g First reinforcing frame 3h Second reinforcing frame 3m Central frame 4 Bracing
5 Cover member 11 Guide rail
11a Groove shape 13a Open side protrusion
13b Closed side protrusion 20 Door body
25U Open side pivot shaft 25D Closed side pivot shaft
26U Open side guide roller 26D Closed side guide roller 27 Auxiliary roller 28 Contact portion
30L Left door pulley 30R Right door pulley
102p Packing 128 Contact part
Ch Airtight Room
S Airtight space M Electric winch
H Manual winch Ha Flow measurement port
Hp Pressure measurement port P1 First fixed pulley
P2 Second fixed pulley P3 Third fixed pulley
P4 Fourth fixed pulley C Compressor
B Valve F Flow meter
P Pressure gauge r Rope
Rp Through hole Pa Inner protrusion
Pb Outer protrusion Pc Groove

Claims (6)

A door structure including a frame having an opening, and a door body provided on the frame so as to be displaceable between an open position that opens the opening and a closed position that closes the opening from one side of the frame,
The frame is provided with a pair of guide rails near the opening,
The door body is provided to be slidable between the open position and the closed position along the pair of guide rails,
An annular packing is provided around the periphery of the opening or the peripheral edge of the door body, and an annular abutment portion is provided on the other of the periphery of the packing when the door body seals the opening,
An annular airtight chamber is formed along the packing between the packing and the abutment portion,
The airtight chamber is provided with a pressure measurement port and a flow rate measurement port which are in communication with an internal space of the airtight chamber,
At least one of the pressure measurement port and the flow rate measurement port is provided penetrating the frame,
A pressure gauge for measuring the air pressure in the airtight chamber can be connected to the pressure measurement port,
A compressor for causing a gas to flow into the airtight chamber and a flow meter for measuring the amount of the gas flowing into the airtight chamber can be connected to the flow rate measurement port,
With the door body placed in a sealed position, the compressor causes the gas to flow into the airtight chamber so that the air pressure in the airtight chamber measured by the pressure gauge remains constant for a predetermined period of time, and based on the inflow amount measured by the flow meter within the predetermined period of time, the amount of gas leaking from the sealed portion of the opening by the door body is estimated, thereby making it possible to measure the airtight performance of the door body at the opening. The packing includes two protruding portions protruding along a circumferential direction of the packing toward the abutment portion,
The surface of the abutment portion on the side of the packing is formed into a flat shape,
2. The door structure according to claim 1, wherein the two protrusions of the packing abut against the abutment portion, so that a groove between the two protrusions and the abutment portion form the airtight chamber. The contact portion is formed in a substantially U-shape in a cross-sectional view perpendicular to the circumferential direction, and a groove shape is disposed toward the packing,
The surface of the packing on the side of the abutment portion is formed into a flat shape,
The door structure according to claim 1 , wherein the abutment portion abuts against the packing, whereby the groove shape and the packing form the airtight chamber. A guide roller is provided on the side of the pair of guide rails in the door body, the guide roller being rotatable inside the guide rail around an axis extending toward the guide rail,
4. The door structure according to claim 1, wherein when the door body seals the opening, the guide rail guides the guide roller to displace the door body toward the frame body, so that the other presses the packing. The pair of guide rails are provided along the up-down direction of the frame body,
The door body is provided so as to be able to rise and fall along the pair of guide rails,
The door structure according to claim 4 , wherein the door body is lowered to close the opening. An airtightness test method for measuring the airtightness performance of a door body at an opening, using a mock door including a self-supporting frame body having an opening and a door body provided on the frame body so as to be displaceable between an open position that opens the opening and a closed position that closes the opening from one side of the frame body,
The frame is provided with a pair of guide rails near the opening,
The door body is provided to be slidable between the open position and the closed position along the pair of guide rails,
An annular packing is provided around the periphery of the opening or the peripheral edge of the door body, and an annular abutment portion is provided on the other of the periphery of the packing when the door body seals the opening,
An annular airtight chamber is formed along the packing between the packing and the abutment portion,
The frame is provided with a pressure gauge that measures the air pressure in the airtight chamber, a compressor that causes gas to flow into the airtight chamber, and a flow meter that measures the amount of gas flowing into the airtight chamber,
At least one of the pressure gauge, the compressor, and the flow meter is provided in a flow path that passes through the frame and communicates with the airtight chamber,
With the door body disposed in the closed position,
The compressor causes the gas to flow into the airtight chamber so that the air pressure in the airtight chamber measured by the pressure gauge remains constant for a predetermined period of time;
An airtightness testing method, comprising estimating the amount of gas leaking from the sealing portion of the opening by the door body based on the inflow amount measured by the flow meter within the specified time.

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