Room pressure fluctuation suppression door and room pressure fluctuation suppression method

Abstract

To provide a door and a method for suppressing a room pressure fluctuation which are capable of suppressing a room pressure fluctuation generated at each point of time when the door is opened and closed immediately without using an indoor condition change as a reference.SOLUTION: A room pressure fluctuation suppression door 1 is configured to locate between two adjacent rooms, to suppress a pressure fluctuation in at least one of the two rooms, and to pivot for opening / closing. The room pressure fluctuation suppression door has a closable opening 18 at the bottom, door fixing means 2 for fixing the door in a closed state when the door is closed, and operation means 3 for operating the door fixing means 2 to fix the door 1 in the closed state or to release the fixed closed state. An opening / closing structure of the door automatically opens the door when the fixed closed state by the door fixing means 2 is released, but does not automatically close the door from the open state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a door for suppressing fluctuations in room pressure in a clean room, a negative pressure room, a positive pressure room, etc., and to a method for suppressing the above fluctuations. [Background technology]

[0002] In facilities such as clean rooms, negative pressure rooms, and positive pressure rooms, systems are used to control the room pressure by maintaining a pressure difference between the indoor space and the outdoor space above a specified level to prevent the inflow of foreign objects from the outside and the outflow of contaminants generated inside to the outside.

[0003] In the above-mentioned facility, multiple rooms are provided, and the above-mentioned system controls the pressure in at least one of two adjacent rooms. A door is usually provided between these rooms to allow communication between the two rooms. However, when the door is opened, the pressures in the two rooms are reversed, and as a result, contaminants may be mixed into the room where the pressure is controlled. This can cause problems such as cross-contamination.

[0004] Regarding room pressure control, for example, Patent Document 1 proposes a method of preventing room pressure reversal by recording the door opening degree and the corresponding airflow volume in advance, deriving the opening degree when the door is actually opened from multiple sensors installed on the door, and controlling the damper to supply more air by the amount of airflow based on this.

[0005] Patent Document 2 proposes a method of measuring the pressure difference between the chambers, and changing and controlling the opening ratio by operating a closing member in a differential pressure maintaining damper provided between the chambers so as to maintain a constant pressure difference.

[0006] Patent Document 3 proposes a method in which, between two rooms connected by a door that are controlled to different room pressures, the door is judged to be open when the room pressure difference between them increases and then decreases, and the door is judged to be closed when the room pressure difference increases again after the door is judged to be open. This method measures the room pressure difference, and based on this, after the door is judged to be open, room pressure control of the two rooms is stopped until the door is judged to be closed, and once the door is judged to be closed, room pressure control of the two air-conditioned spaces is started again.

[0007] All of these inventions are based on a rational methodology and technical concept, and are based on measuring and detecting changes in room pressure and other conditions, and controlling room pressure fluctuations via electrical signals. However, when changes in room conditions are used as the standard, room pressure control through measurement, detection, and signal transmission is often unable to keep up, and in fact, situations often arise where, for example, a door opens and closes before control begins. As a result, it is not rare for room pressure fluctuations to be fully suppressed on-site.

[0008] Furthermore, if room pressure fluctuations are suppressed based on changes in conditions inside the room, there is a risk that measurements and detection will not be possible when there is insufficient power due to a power outage, etc., and that room pressure fluctuations caused by the opening and closing of doors will not be adequately controlled.

[0009] Furthermore, in a room where the pressure is kept higher than atmospheric pressure and a damper with a mechanism for controlling the pressure to the target pressure is provided on the exhaust path, (1) when the door is opened, the rooms with different pressures communicate with each other, causing the room pressure to drop, and the damper closes to raise the pressure to a steady state (resulting in an excess air supply state). (2) When the door starts to close, the damper cannot keep up with the door rotation speed, and the excess air supply state to the room is maintained immediately after the door is closed, causing the room pressure to rise. (3) When the damper detects this increased pressure, it opens, restoring the stable opening when the door is closed, and the room pressure returns to the set value. This series of events can cause problems with large fluctuations in room pressure, but control via electrical signals cannot adequately address such problems. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent Publication No. 2006-317082 [Patent Document 2] Patent Publication 2017-161117 [Patent Document 3] Patent Publication No. 2007-247912 Summary of the Invention [Problem to be solved by the invention]

[0011] In light of the above problems and current situation, the inventors have focused on suppressing room pressure fluctuations by changing the door structure itself, rather than using changes in the conditions inside the room as a criterion.

[0012] Furthermore, as a result of experiments and research, it was found that the doors used in clean rooms, negative pressure rooms, positive pressure rooms, etc. are relatively heavy, and when they are opened manually (by pushing or pulling the door), too much force is applied and they often open suddenly, which can cause large fluctuations in the room pressure when the door is opened.

[0013] On the other hand, when a person closes the door of a room that requires airtightness, with conventional doors, there is no significant fluctuation in room pressure until the door approaches the frame to which it is attached (for example, in clean rooms, four-sided frames or three-sided frames with no frame boards on the floor surface are mainly used). However, at the stage where the door is pushed into the frame, i.e., when the air in the space of the frame is pushed into the target room, the opening to the target room suddenly decreases, putting pressure on the door, and it is necessary to push the door into the frame in one go with a force corresponding to this pressure, so that during this process a phenomenon occurs where the room pressure suddenly rises (hereinafter referred to as "overshoot" in this specification). This becomes a disturbance to the pressure fluctuations in the stable operation of the room pressure, and it was found that how to suppress this poses a challenge.

[0014] The present invention has been made in consideration of the above-mentioned problems, and its objective is to provide a door that suppresses room pressure fluctuations that may occur when the door is opened and closed, without any time lag, and a method for suppressing the above-mentioned room pressure fluctuations, without using changes in indoor conditions as a basis. [Means for solving the problem]

[0015] In order to solve the above problems, the present invention proposes a door that can be opened automatically without relying on electricity and has a structure that keeps the opening speed constant. On the other hand, the door is configured so that when it is closed, a part of the door is left open, and the opening is closed immediately after the door is closed to keep the room airtight.

[0016] That is, the present invention provides, as a first aspect, A chamber pressure fluctuation suppression door that is provided between two adjacent chambers and suppresses pressure fluctuations in at least one of the two chambers, The room pressure fluctuation suppression door is a door that is opened and closed by rotating, the room pressure fluctuation suppression door has a closable opening at a lower portion, The room pressure fluctuation suppression door has a door fixing means for fixing the room pressure fluctuation suppression door in a closed state when the door is closed, and an operation means for operating the door fixing means to fix the room pressure fluctuation suppression door in the closed state or to release the fixation of the closed state, the room pressure fluctuation suppression door has an opening and closing structure that automatically opens when the door fixing means releases the door from the closed state, but does not automatically close from the open state, the operating means is connected to a closing means for closing the opening by a connecting means; When the operating means is operated while the room pressure fluctuation suppressing door is closed, the door fixing means is actuated to fix the room pressure fluctuation suppressing door in a closed state, and in conjunction with this, the closing means is actuated to close the opening, thereby maintaining airtightness in at least one of the rooms, When the operation means is operated by a user while the door is fixed in the closed state by the door fixing means, the door is released from the closed state and, in conjunction with this, the blocking of the opening by the blocking means is released. A room pressure fluctuation suppression door characterized by to provide.

[0017] The second aspect is The opening and closing structure includes: a housing having a sealed space filled with hydraulic oil, a rotating shaft having teeth formed on its outer periphery, a piston having teeth in its lengthwise direction that mesh with the teeth of the rotating shaft and capable of reciprocating movement, and a biasing means for biasing the piston in a direction to open the room pressure fluctuation suppression door, the housing being attached to an upper portion of the room pressure fluctuation suppression door, One end of a link mechanism is connected to one end of the rotating shaft, and the other end of the link mechanism is connected to the upper frame side of the door opening for the room pressure fluctuation suppression door. The above-mentioned room pressure fluctuation suppression door to provide.

[0018] The third aspect is: The above-mentioned room pressure fluctuation suppression door, wherein the opening speed of the room pressure fluctuation suppression door when automatically opening is 0.3 m / sec or less. to provide.

[0019] The fourth aspect is: In the case where a damper is provided in at least one of the two rooms or in the air supply or exhaust path thereof, which measures a target room pressure in order to maintain a target room pressure and controls the air volume based on the measured value, the room pressure fluctuation suppression door has a sensor that detects the opening and closing of the door, and based on the door opening and closing state output from the sensor, the damper stops air volume control when the room pressure fluctuation suppression door is opened and starts air volume control after the room pressure fluctuation suppression door is closed. to provide.

[0020] The fifth aspect is: A chamber pressure fluctuation suppression method for suppressing pressure fluctuations in at least one of two adjacent chambers, comprising: A room pressure fluctuation suppression door that rotates to open and close is provided between the two chambers, The room pressure fluctuation suppression door is configured to automatically open when the closed door state is released, but not to automatically close from the open door state, The room pressure fluctuation suppression door has a closable opening at a lower portion, and has a door fixing means for fixing the room pressure fluctuation suppression door in a closed state when the door is closed, and an operation means for operating the door fixing means to fix the room pressure fluctuation suppression door in the closed state or to release the fixation of the closed state, When the operating means is operated while the room pressure fluctuation suppressing door is closed, the door fixing means is actuated to fix the room pressure fluctuation suppressing door in a closed state, and the closing means is actuated in conjunction with the door to close the opening, thereby maintaining airtightness in at least one of the rooms, When the operation means is operated while the door is fixed in the closed state by the door fixing means, the fixed closed state of the door is released and, in conjunction with this, the blocking means releases the blocking of the opening. A method for suppressing room pressure fluctuations to provide. Effect of the Invention

[0021] According to the present invention, it is possible to suppress room pressure fluctuations caused by the opening and closing of a door without measuring or detecting changes in the state of the room. Also, according to the present invention, it is possible to suppress room pressure fluctuations that may occur when the door is opened and closed, without any time lag. Furthermore, even if a situation occurs in which the power supply is insufficient for some reason, it is possible to suppress room pressure fluctuations caused by the opening and closing of a door. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a diagram showing an embodiment of the present invention, illustrating a room pressure fluctuation suppression door from the front. [Diagram 2] FIG. 2 is a side view of the room pressure fluctuation suppression door of FIG. 1. [Diagram 3] FIG. 1 is a diagram according to an embodiment of the present invention, showing an example of a structure for automatically opening the door. [Figure 4]4 is a diagram showing the structure of Fig. 3 from a different angle, Fig. 4(A) shows the state when the door is closed, and Fig. 4(B) shows the state when the door is open. [Diagram 5] 2 is a diagram showing a state in which an opening portion of the room pressure fluctuation suppressing door in FIG. 1 is closed. FIG. [Figure 6] FIG. 6 is a side view of the room pressure fluctuation suppression door in FIG. 5. [Figure 7] FIG. 3 is a partially enlarged view of the upper part of FIG. 2, showing the inside. [Figure 8] FIG. 1 is a diagram showing conditions of Comparative Experiment 1. [Figure 9] FIG. 1 is a diagram showing the results of Comparative Experiment 1. [Figure 10] FIG. 1 is a diagram showing the results of Comparative Experiment 1. [Figure 11] FIG. 1 is a diagram showing the results of Comparative Experiment 1. [Figure 12] FIG. 13 is a diagram showing conditions of Comparative Experiment 2. [Figure 13] FIG. 13 is a diagram showing the results of Comparative Experiment 2. [Figure 14] FIG. 13 is a diagram showing the results of Comparative Experiment 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiment.

[0024] (First embodiment) This embodiment will be described taking as an example a case in which the present invention is applied to a door provided between two adjacent rooms in a facility such as a clean room where a plurality of rooms are air-conditioned at different room pressures.

[0025] An example of the room pressure fluctuation suppressing door of the present invention is shown in Figures 1 and 2. These figures show a part of the room pressure fluctuation suppressing door so that the internal structure (such as the location of the rod or shaft serving as the connecting means) can be seen. Figure 2 shows the room pressure fluctuation suppressing door of Figure 1 from the side (left side as one faces Figure 1). This room pressure fluctuation suppressing door (1) is attached to a door frame (14) installed in a building (or room) by a hinge (13) (see Figure 4) so ​​as to be able to open and close, and is opened and closed by rotating toward one of the rooms. The room pressure fluctuation suppressing door (1) also has an airtight structure for maintaining airtightness within the room. A publicly known airtight structure can be applied as the airtight structure.

[0026] The room pressure fluctuation suppressing door (1) of the present invention has a door fixing means (2) for fixing the room pressure fluctuation suppressing door in a closed state when the door is closed. The door fixing means (2) can be a dead lock. The room pressure fluctuation suppressing door (1) has an operation means (handle for operating the door fixing means) (3) for a user to operate the door fixing means (2) to fix the room pressure fluctuation suppressing door (1) in a closed state or to release the fixation of the closed state. As these means, a known cremone handle (cremone lock) may be used, which switches between a locked state and an unlocked state by extending or retracting a rod up and down.

[0027] The room pressure fluctuation suppressing door (1) of the present invention is configured to automatically open when the user operates the operating means (3) to release the closed state fixed by the door fixing means (2) and releases the operating means (3). The door opening speed when automatically opening can be configured to be constant. As described above, doors used in clean rooms, negative pressure rooms, positive pressure rooms, etc. are relatively heavy, so if the door is opened manually (by pushing or pulling the door), too much force may be applied and the door may open suddenly, which may cause a large room pressure fluctuation. If the room pressure fluctuation suppressing door (1) is configured as described above, the user operates the operating means (3) to release the closed state fixed by the door fixing means (2), and then releases the operating means (3), the room pressure fluctuation suppressing door (1) will automatically open at a constant speed. Therefore, it is possible to avoid abrupt opening of the door and causing a large room pressure fluctuation.

[0028] An example of a specific structure for automatically opening the door after the door is released from the closed state fixed by the door fixing means (2) is shown in Figs. 3 and 4.

[0029] As shown in FIG. 1, a housing (4) having a predetermined internal structure is attached to the upper part of the room pressure fluctuation suppressing door (1). An example of the internal structure of this housing (4) is shown in FIG. 3. FIG. 3 is a top view of the housing (4) of FIG. 1. The housing (4) has an enclosed space (5) filled with hydraulic oil, a rotating shaft (6) having teeth (7) formed on its outer periphery, a reciprocating piston (8) having teeth (12) (rack and pinion mechanism) in its lengthwise direction that mesh with the teeth (7) of the rotating shaft, and a biasing means (9) for biasing the piston (8) in a direction to open the room pressure fluctuation suppressing door (1). In the example of FIG. 3, the rack and pinion mechanism is disposed in a hollow portion (15) of the piston (8), but this is not necessarily limited to such a configuration, and an appropriate modification of this configuration may be adopted.

[0030] The rotating shaft (6) is connected so as to penetrate vertically through the housing (4). One end of the rotating shaft (6) is connected to one end of a link mechanism (10), and the other end of the link mechanism (10) is connected to the upper frame side (11) of a door frame installed in a building (or room).

[0031] Since the room pressure fluctuation suppressing door (1) of the present invention has a structure that opens and closes by rotating, when it is closed, the rotational motion is transmitted to the rotating shaft (6) via the link mechanism (10), and is converted into linear motion of the piston via the teeth of the rotating shaft (6) and the longitudinal teeth (12) that mesh with them. As a result, the piston (8) moves in the sealed space (5) of the housing (4) and compresses the biasing means (9). When the operating means (3) is operated in this state (i.e., the door is closed), the door is fixed in the closed state by the door fixing means (2).

[0032] Thereafter, in the above-mentioned fixed state, the operating means (3) is operated to release the closed door state fixed by the door fixing means (2) and the operating means (3) is released. Then, the piston (8) is biased by the repulsive force of the compressed biasing means (9), the rotating shaft (6) rotates, and the room pressure fluctuation suppression door (1) automatically opens.

[0033] When the room pressure fluctuation suppressing door (1) is opened, the piston (8) moves as the rotating shaft (6) rotates, and at that time, the hydraulic oil filled inside the sealed space (5) flows in accordance with the movement of the piston (8). The opening speed of the room pressure fluctuation suppressing door (1) is adjusted by controlling the flow rate of this hydraulic oil with a valve (adjusting valve). More specifically, the adjusting valve is disposed in a flow path (not shown) connecting the high pressure chamber (16) and the low pressure chamber (17) of the sealed space (5), and this adjusting valve controls the flow rate of the hydraulic oil flowing in the sealed space (5) in conjunction with the movement of the piston (8), thereby adjusting the opening speed of the room pressure fluctuation suppressing door (1).

[0034] Experiments have shown that the slower the door opening speed, the more room pressure fluctuations can be suppressed. On the other hand, if the door opening speed is too slow, there is a risk of it interfering with work efficiency. Research and experiments have shown that if the time it takes for the door to open wide enough for a worker to pass through is around 3 seconds, the actual impact on work efficiency can be suppressed. As a result of conducting comparative experiments based on these points, it is considered that the opening speed of the room pressure fluctuation suppression door (1) should be 0.3 m / s or less.

[0035] When the room pressure fluctuation suppression door (1) is configured as described above, the room pressure fluctuation suppression door (1) does not automatically close from the open door state. From the viewpoint of suppressing room pressure fluctuations, unlike the case of an automatic door opening, there is little point in automatically closing the door, so no problems arise with this configuration.

[0036] The room pressure fluctuation suppressing door (1) of the present invention has an opening (18) in the lower part. This opening (18) is configured so as to be blockable (closable) by a closing means (19).

[0037] The blocking means (19) is provided below the room pressure fluctuation suppressing door (1). When the opening (18) is not blocked, the blocking means (19) is stored inside the room pressure fluctuation suppressing door (1), and when the opening (18) is blocked, the blocking means (19) protrudes downward from the room pressure fluctuation suppressing door (1) and abuts against the floor (21) to block it.

[0038] More specifically, the closing means (19) that closes the opening (18) and the above-mentioned operating means (3) are connected by a connecting means (22) such as a shaft or a rod. Also, the connecting means (20) located above the operating means (3) connects the operating means (3) to the upper part of the room pressure fluctuation suppressing door (1).

[0039] When the user operates the operating means (3) to close the room pressure fluctuation suppressing door (1), the door fixing means (2) described above is actuated to fix the room pressure fluctuation suppressing door (1) in the closed state, and the connecting means (20) moves upward, causing the tip (24) provided at the tip of the connecting means (20) to come into contact with the roller part (23) and be inserted between the roller part (23) and the locking part (25), whereby the upper part of the room pressure fluctuation suppressing door (1) is pressed against the upper frame side (11) of the door opening (see Fig. 7, which is a partial enlargement of the upper part of Fig. 2). In other words, the room pressure fluctuation suppressing door (1) maintains airtightness by pressing the door frame (packing) in the direction of the arrow in Fig. 7.

[0040] Furthermore, in conjunction with the above operation, the connecting means (22) moves downward, and the closing means (19) operates to protrude downward from the room pressure fluctuation suppressing door (1) and abut against the floor, completely closing the entire opening (18). When the opening (18) is completely closed, the room is kept airtight.

[0041] 5 and 6 show the room pressure fluctuation suppressing door (1) in a state where the room pressure fluctuation suppressing door (1) is fixed in a closed state and the opening (18) is closed by a closing means (19).

[0042] In this embodiment, the opening (18) is provided so as to be located between the lower part of the room pressure fluctuation suppressing door (1) and the floor (21), and over the entire length in the width direction (the left-right direction of the room pressure fluctuation suppressing door (1) as viewed in FIG. 1). In other words, an opening (18) having a horizontally elongated rectangular shape (as viewed in FIG. 1) is provided between the lower end of the room pressure fluctuation suppressing door (1) and the floor (21). The closing means (19) is configured to close the opening (18).

[0043] The position, shape, and range of the opening are not limited to those described above, and for example, the lower part of the room pressure fluctuation suppressing door (1) may be configured so that only a part of it is open, rather than the entire width of the lower part. Whatever the position, shape, and range of the opening (18), the blocking means (19) is configured to completely block it.

[0044] As described above, when the user operates the operating means (3) to fix the closed state of the room pressure fluctuation suppressing door (1) after closing it, the closing means (19) is simultaneously actuated to close the opening (18) (FIGS. 5 and 6). In other words, the opening (18) is kept unblocked (open) until just before the door is closed. Therefore, even if the door approaches the frame to which it is attached when closing, the door is not subjected to much surface pressure, and it is easy to close the door all the way to the frame. The air in the space of the frame has already been pushed in, and the operating means (3) is used to close the area of ​​the opening (18) to zero, so no new air is pushed in. In other words, by configuring the door as described above, it is possible to avoid the problem of overshoot that occurs when the door is closed.

[0045] The closing means (19) and the operating means (3) are connected by the connecting means (22). Therefore, when the user operates the operating means (3) while the door is fixed in the closed state by the door fixing means (2), the door is released from the closed state and, in conjunction with this, the closing means (19) is pulled upward, and the closing of the opening (18) by the closing means (19) is released.

[0046] According to the present invention, it is possible to suppress room pressure fluctuations without measuring or detecting changes in conditions inside the room. In addition, since the door is automatically opened at a constant speed without using electricity and a part of the door is kept open until it is closed, it is possible to suppress room pressure fluctuations that may occur when the door is opened and closed without any time lag.

[0047] (Comparative experiment 1) In a chamber configured as shown in FIG. 8, door A of the front chamber (a normal door) was closed, and door B of the main chamber was configured in each of the following patterns (1-1) to (1-3). In each case, it was opened and closed every 10 seconds, and the pressure fluctuations in the front chamber and main chamber were measured.

[0048] [Door B pattern in Comparative Experiment 1] (1-1) In the case that Door B is a normally used door (without the configurations (1-2) and (1-3) below). (1-2) Door B has a door fixing means for fixing the door in a closed state when closed, and an operating means for activating the door fixing means to fix the door in a closed state or to release the fixed closed state, and has an opening and closing structure which automatically opens the door when the fixed closed state by the door fixing means is released, but does not automatically close from the open state. (1-3) With regard to door B, in addition to the opening and closing structure of (1-2) above, a closeable opening is provided at the bottom, and when the operating means is operated by the user to close the door, the door fixing means is activated to fix the room pressure fluctuation suppression door in the closed state, and in conjunction with this, the blocking means is activated to block the opening, thereby maintaining airtightness in at least one of the rooms, and when the operating means is operated by the user while the closed state is fixed by the door fixing means, the fixation of the closed state is released, and in conjunction with this, the blocking means releases the blockage of the opening (this invention).

[0049] The results are shown in Figures 9 to 11. In the graphs, the dashed line indicates the pressure fluctuation in the main chamber, and the solid line indicates the pressure fluctuation in the anterior chamber.

[0050] As shown in Figure 9, in the case of (1-1) above, when the door was opened, the pressure in the antechamber and main chamber was reversed due to pressure fluctuations (see "a" on the graph, etc.). Furthermore, when the door was closed, the pressure in the main chamber deviated to a value (approximately +60 Pa) that was nearly twice the set pressure (+30 Pa) (see "b" on the graph, etc.). This indicates that a large overshoot occurred.

[0051] As shown in Figure 10, in the case of (1-2) above, there was no room pressure reversal between the antechamber and main chamber when the door was opened (see "c" on the graph, etc.). However, when the door was closed, the pressure in the main chamber deviated from the set pressure (+30 Pa) by nearly double (close to +60 Pa) (see "d" on the graph, etc.), just as in the case of (1-1) above. In other words, this shows that a large overshoot occurred.

[0052] As shown in Figure 11, in the case of (1-3) above (the present invention), no pressure reversal occurred when the door was opened (see "e" on the graph, etc.). Furthermore, even when the door was closed, the pressure in the main chamber was kept at about +40 Pa, and did not deviate significantly from the set pressure (+30 Pa) (see "f" on the graph, etc.). In other words, no large overshoot occurred.

[0053] As described above, it has been shown that the present invention can suppress room pressure fluctuations that can occur both when the door is opened and when it is closed without any time lag, demonstrating a remarkable effect.

[0054] Second embodiment The present invention can also be applied to cases where a damper (known in the art) having a mechanism for measuring the target room pressure to maintain the target room pressure and controlling the air volume based on the measured value is provided in the air supply or exhaust path (duct) of each room. The structure, configuration and other details of the room pressure fluctuation suppression door in this case are basically the same as those described in the first embodiment.

[0055] In this case, a sensor for detecting the opening and closing of the room pressure fluctuation suppressing door may be provided. That is, based on the open / closed state of the door output from the sensor, the damper is configured to stop airflow control when the room pressure fluctuation suppressing door is opened, and to start airflow control after the room pressure fluctuation suppressing door is closed. With this configuration, in addition to the basic control being performed by the door structure and suppressing room pressure fluctuations due to the opening and closing of the door, additional control by the damper can be performed, making it possible to further suppress room pressure fluctuations due to the opening and closing of the door.

[0056] (Comparative experiment 2) In a room with the configuration shown in Fig. 12, the front room door A (normal door) was closed, and the main room door B was configured according to the basic configuration (1-3) above, but further configured in the following patterns (2-1) to (2-2) (all of which are the present invention), and in each case it was opened and closed every 10 seconds, and the pressure fluctuations in the front room and main room were measured. A damper was installed in the duct leading to the main room to adjust the air volume in the main room. This damper is a known device that adjusts the air volume to a specified pressure based on the pressure difference between inside and outside the room.

[0057] [Door B pattern in Comparative Experiment 2] (2-1) Door B is configured in the same manner as in (1-3) above, but no sensor is provided to detect door opening and closing (or a sensor is provided but not activated). (2-2) For door B, in addition to the configuration of (1-3) above, a sensor is provided to detect the opening and closing of the door, and based on the open / closed state of the door output from the sensor, the damper stops air volume control when the room pressure fluctuation suppression door is opened and starts air volume control after the room pressure fluctuation suppression door is closed.

[0058] The results are shown in Figures 13 and 14. In the graphs, the dashed line indicates the pressure fluctuation in the main chamber, and the solid line indicates the pressure fluctuation in the front chamber.

[0059] As shown in these figures, in both cases (2-1) and (2-2) above, no pressure reversal occurred when the door was opened (see “g” and “i” on the graphs, etc.).

[0060] When the door was closed, in the above case (2-1), the pressure in the main room was suppressed to about +40 Pa, which did not deviate significantly from the set pressure (+30 Pa) (see "h" on the graph, etc.), but in the above case (2-2), the pressure in the main room was suppressed to just above +30 Pa, and the pressure fluctuations when the door was closed were even smaller (see "j" on the graph, etc.). In this way, it was demonstrated that the combination of the present invention and damper control can provide an extremely significant effect (suppression of room pressure fluctuations due to the opening and closing of the door). [Industrial Applicability]

[0061] According to the present invention, it is possible to suppress fluctuations in room pressure caused by the opening and closing of a door without measuring or detecting changes in conditions inside the room.

[0062] In addition, since room pressure fluctuations are suppressed by the door structure itself, without relying on electrical signals, room pressure fluctuations that may occur both when the door is opened and closed can be suppressed without any time lag.

[0063] Furthermore, even if a situation arises in which the power supply is insufficient for some reason, it is possible to suppress fluctuations in room pressure caused by opening and closing the door.

[0064] Furthermore, according to the present invention, even when applied to an existing control system, it is only necessary to replace the door with the one of the present invention, and there is no need to replace the entire control system.

[0065] INDUSTRIAL APPLICABILITY The present invention thus contributes to improved suppression of room pressure fluctuations in clean rooms, negative pressure rooms, positive pressure rooms, etc., and has extremely great industrial applicability. [Explanation of symbols]

[0066] 1. Room pressure fluctuation suppression door 2 Door fixing means 3 Operating means 4. Housing 5 Closed space 6 Rotation Axis 7 Teeth 8 Piston 9. Actuating means 10 Link mechanism 11 Upper frame side of door opening 12 Teeth 13 Hinge 14 slots 15 Cavity 16 Hyperbaric Chamber 17 Low pressure chamber 18 Openings 19 Obstruction means 20, 22 Connection means 21 Beds 23 Roller section 24 Tip 25 Locking part

Claims

1. A chamber pressure fluctuation suppression door that is provided between two adjacent chambers and suppresses pressure fluctuations in at least one of the two chambers, The room pressure fluctuation suppression door is a door that is opened and closed by rotating, the room pressure fluctuation suppression door has a closable opening at a lower portion, The room pressure fluctuation suppression door has a door fixing means for fixing the room pressure fluctuation suppression door in a closed state when the door is closed, and an operation means for operating the door fixing means to fix the room pressure fluctuation suppression door in the closed state or to release the fixation of the closed state, the room pressure fluctuation suppression door has an opening and closing structure that automatically opens when the door fixing means releases the door from the closed state, but does not automatically close from the open state, the operating means is connected to a closing means for closing the opening by a connecting means; When the operating means is operated while the room pressure fluctuation suppressing door is closed, the door fixing means is actuated to fix the room pressure fluctuation suppressing door in a closed state, and in conjunction with this, the closing means is actuated to close the opening, thereby maintaining airtightness in at least one of the rooms, When the operation means is operated by a user while the door is fixed in the closed state by the door fixing means, the door is released from the closed state and, in conjunction with this, the blocking of the opening by the blocking means is released. A room pressure fluctuation suppression door characterized by the above.

2. The opening and closing structure includes: a housing having a sealed space filled with hydraulic oil, a rotating shaft having teeth formed on its outer periphery, a piston having teeth in its lengthwise direction that mesh with the teeth of the rotating shaft and capable of reciprocating movement, and a biasing means for biasing the piston in a direction to open the room pressure fluctuation suppression door, the housing being attached to an upper portion of the room pressure fluctuation suppression door, One end of a link mechanism is connected to one end of the rotating shaft, and the other end of the link mechanism is connected to the upper frame side of the door opening for the room pressure fluctuation suppression door. The room pressure fluctuation suppressing door according to claim 1.

3. 3. The room-pressure fluctuation suppressing door according to claim 1, wherein the opening speed of the room-pressure fluctuation suppressing door when automatically opening is 0.3 m / sec or less.

4. 3. A room pressure fluctuation suppression door as described in claim 1 or 2, in which a damper is provided in at least one of the two chambers or in its air supply or exhaust path, which measures a target room pressure to maintain a target room pressure and controls the air volume based on the measured value, the room pressure fluctuation suppression door has a sensor that detects its opening and closing, and based on the door opening and closing state output from the sensor, the damper stops air volume control when the room pressure fluctuation suppression door is opened and starts air volume control after the room pressure fluctuation suppression door is closed.

5. A chamber pressure fluctuation suppression method for suppressing pressure fluctuations in at least one of two adjacent chambers, comprising: a room pressure fluctuation suppression door that rotates to open and close is provided between the two chambers; The room pressure fluctuation suppression door is configured to automatically open when the closed door state is released, but not to automatically close from the open door state, The room pressure fluctuation suppression door has a closable opening at a lower portion, and has a door fixing means for fixing the room pressure fluctuation suppression door in a closed state when the door is closed, and an operation means for operating the door fixing means to fix the room pressure fluctuation suppression door in the closed state or to release the fixation of the closed state, When the operating means is operated while the room pressure fluctuation suppressing door is closed, the door fixing means is actuated to fix the room pressure fluctuation suppressing door in a closed state, and the closing means is actuated in conjunction with the door to close the opening, thereby maintaining airtightness in at least one of the rooms, When the operation means is operated while the door is fixed in the closed state by the door fixing means, the fixed closed state of the door is released and, in conjunction with this, the blocking means releases the blocking of the opening. A method for suppressing room pressure fluctuations.

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