JP2005114317A - Negative/positive pressure switch type ventilating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely prevent various troubles caused by false recognition whether a ventilation subject room is under a positive pressure condition or a negative pressure in a negative/positive pressure switch type ventilating equipment. <P>SOLUTION: In the negative/positive pressure switch type ventilating equipment provided with switch means 15, 16 for switching an operation mode of a ventilating devices Fs, Fe for the ventilation subject room 1 to a positive pressure operation mode for applying positive pressure to the ventilation subject room 1 and a negative pressure operation mode for applying negative pressure to the ventilation subject room 1, display means 19a, 19b, 16 are provided to display which operation mode the ventilating devices Fs, Fe are in, the positive pressure operation mode or the negative pressure operation mode, at an inlet part 8 or an outlet part of the ventilation subject room 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a positive / negative pressure switch provided with a switching means for switching the operation mode of a ventilator for a ventilation target room between a positive pressure operation mode in which the ventilation target room is positive and a negative pressure operation mode in which the ventilation target room is negative. It relates to type ventilation equipment.

Conventionally, as this type of ventilation equipment, the operation mode of the ventilator is switched between the positive pressure operation mode and the negative pressure operation mode described above by switching operation of the supply / exhaust damper and inverter control of the supply / exhaust fan. There is one adapted to change the usage of a room (see Patent Document 1).
JP-A-6-249482

  However, conventionally, for a person entering or leaving the room to be ventilated (particularly a person entering the room), whether the ventilation apparatus is operated in the positive pressure operation mode and the ventilation target room is in the positive pressure state, or the ventilation apparatus is in the negative pressure operation mode. It is not possible to tell whether the room being ventilated is in a negative pressure state. For this reason, for example, even though the room to be ventilated is positive in order to prevent the entry of dust, bacteria, etc., it is misidentified. Inadvertently entering the room and bringing dust or bacteria into the room to be ventilated, or conversely, even though the room to be ventilated has a negative pressure to prevent infection due to the leakage of pathogenic bacteria outdoors There is a risk that the misidentified person may enter the room carelessly and be infected with the pathogen, or the misidentified person may inadvertently leave the ventilation target room and cause the pathogen to leak out of the room.

  In view of this situation, the main problem of the present invention is to reliably prevent various inconveniences such as the above-mentioned example caused by misidentification of whether the ventilation target room is in a positive pressure state or a negative pressure state in a negative / positive pressure switching type ventilation facility. It is to be able to prevent.

[1] The first characteristic configuration of the present invention is that the operation mode of the ventilation device for the ventilation target room is divided into a positive pressure operation mode in which the ventilation target room is positive and a negative pressure operation mode in which the ventilation target room is negative. In the positive / negative pressure switching type ventilation equipment provided with switching means for switching between
A display means for displaying at the entrance or exit of the ventilation target room whether the ventilation device is in the positive pressure operation mode or the negative pressure operation mode is provided.

  In other words, according to the first feature configuration, whether the ventilation device is in the positive pressure operation mode or the negative pressure operation mode is displayed at the entrance or exit of the ventilation target room. The person who enters the room or the person who leaves the room to be ventilated can accurately recognize whether the room to be ventilated is in a positive pressure state or a negative pressure state by the display, Various inconveniences such as the above-mentioned example caused by misidentification of whether the ventilation target room is in a positive pressure state or a negative pressure state can be surely prevented.

  In the implementation of the first characteristic configuration, for example, a positive pressure side indicator lamp in which a character or a sign indicating positive pressure is written is displayed in which of the positive pressure operation mode and the negative pressure operation mode. Beginning with a mode that displays which mode is in operation by selectively lighting with a negative pressure side indicator lamp with letters or signs indicating negative pressure, the ventilation device is in positive pressure mode or negative pressure mode Various display forms can be adopted as long as they can be identified.

  In the implementation of the first feature configuration, when the ventilation device is in the operation stop state, in order to ensure recognition of the operation stop state, the operation mode of the ventilation device is either the positive pressure operation mode or the negative pressure operation mode. It is desirable to stop the display of whether there is a positive pressure side or negative pressure side indicator lamp, for example.

[2] The second feature configuration of the present invention is the implementation of the first feature configuration,
Provided detection means for detecting the room pressure of the ventilation target room, the display means, the positive pressure operation mode is displayed only when the detection chamber pressure of the detection means is equal to or higher than a set threshold room pressure on the positive pressure side, and The negative pressure operation mode is displayed only when the detection chamber pressure of the detection means is equal to or lower than the set threshold chamber pressure on the negative pressure side.

  That is, according to the second feature configuration, the ventilation target room is not less than the positive pressure operation mode and the negative pressure operation mode. The positive pressure by the display means that the room is in a required positive pressure state having a certain chamber pressure and that the ventilation target room is in a required negative pressure state having a chamber pressure equal to or lower than the set threshold chamber pressure on the negative pressure side. It is possible to accurately recognize the operation mode display and the negative pressure operation mode display.

  Thus, for example, the ventilation target room should be opened immediately after the ventilation apparatus is started to operate in the positive pressure operation mode even though the room to be ventilated should enter and exit in a situation where the positive pressure state is required. Inconveniences such as inadvertently entering or leaving the room when the required positive pressure state (room pressure above the positive pressure side set threshold room pressure) has not yet been reached. The room to be ventilated is still in the required negative pressure immediately after the ventilator is started in the negative pressure operation mode even though the room should be entered / exited under certain circumstances (the room pressure below the negative threshold set threshold room pressure) Inconveniences such as inadvertently entering or leaving the room before reaching the level can be effectively prevented together with the prevention of misidentification.

  This second characteristic configuration is such that the room pressure of the ventilation target room is maintained at the set target room pressure on the positive pressure side in the operation in the positive pressure operation mode, and the room pressure of the ventilation target room in the operation in the negative pressure operation mode. In particular, the positive pressure side set threshold chamber pressure is the same as the positive pressure side set target room pressure or positive pressure. The pressure side set target chamber pressure is set to a value slightly lower than the pressure side, and the negative pressure side set threshold chamber pressure is set to the same value as the negative pressure side set target chamber pressure or a value slightly higher than the negative pressure side set target chamber pressure.

  In the implementation of the second characteristic configuration, it is preferable that the administrator can change the setting threshold chamber pressures on the positive pressure side and the negative pressure side, and the target room for ventilation is set on the positive pressure side and the negative pressure side. When adopting the above-mentioned room pressure control method to maintain the room pressure, the set threshold room pressure on the positive pressure side or the negative pressure side is automatically changed to a value corresponding to the new set target room pressure as the set target room pressure is changed. It is good to have a configuration to do.

[3] The third feature configuration of the present invention is the implementation of the second feature configuration,
When the detection chamber pressure of the detection means is a positive pressure value whose absolute value is smaller than the set threshold chamber pressure on the positive pressure side, and the detection chamber pressure of the detection means is the set threshold chamber pressure on the negative pressure side. When the negative pressure value is smaller than the absolute value, an inappropriate state is displayed.

  In other words, according to the third feature configuration, the ventilation target room has not yet reached the required positive pressure state (the room pressure equal to or higher than the positive pressure side set threshold chamber pressure) immediately after the ventilation device is started to operate in the positive pressure operation mode. There is no transient state, or a transient in which the room pressure of the ventilation target room is decreasing at a positive pressure value whose absolute value is smaller than the set threshold pressure on the positive pressure side immediately after the ventilation device is shut down from the operation in the positive pressure operation mode. State, or a transient state where the ventilation target room has not yet reached the required negative pressure state (the room pressure below the negative set threshold room pressure) immediately after the ventilation device is started in the negative pressure operation mode, or the ventilation device Immediately after the operation is stopped from the operation in the negative pressure operation mode, the transient state in which the chamber pressure of the ventilation target room is increasing at a negative pressure value whose absolute value is smaller than the negative pressure side set threshold chamber pressure is It can be recognized more reliably with the indication of the inappropriate state.

  In addition, even if the ventilator is operated in the positive pressure operation mode, for some reason, the room pressure of the ventilation target room does not rise to the set threshold room pressure on the positive pressure side, or the ventilator is in the negative pressure operation mode. Even if the room pressure of the ventilation target room is not fully lowered to the set threshold room pressure on the negative pressure side for some reason, it will be recognized more reliably by displaying the above inappropriate state by the display means. Thus, it is possible to more accurately cope with these transient states and defective states (for example, waiting for entry to the room or reporting to the manager).

  In the implementation of the third characteristic configuration, the display of the unsuitable state includes, for example, any operation mode of the positive pressure operation mode and the negative pressure operation mode by selectively lighting the positive pressure side indicator lamp and the negative pressure side indicator lamp. Positive pressure, such as a form that displays an inadequate state by flashing these indicator lights, or a form that displays an inadequate state by lighting a dedicated indicator light that indicates characters or signs indicating the inappropriate state Various display modes can be adopted as long as they can be distinguished from the operation mode display and the negative pressure operation mode display.

  In addition, while the positive pressure indicator lamp is lit, the positive pressure operation mode is displayed, while the positive pressure indicator lamp blinks, so that the room pressure of the ventilation target room has a positive value whose absolute value is smaller than the set threshold room pressure on the positive pressure side. Inappropriate state on the positive pressure side in the pressure value (that is, the transient state and the defective state on the positive pressure side), and similarly, the negative pressure operation mode is displayed by lighting the negative pressure side indicator lamp, Due to the flashing of the negative pressure side indicator, the negative pressure side inadequate state in which the room pressure of the ventilation target room is at a negative pressure value that is smaller than the set threshold room pressure on the negative pressure side (that is, the transient state on the negative pressure side For example, the above-described defective state) may be displayed, and the transient state and the defective state may be displayed in a state where they can be distinguished from each other as long as they are possible.

  Further, in the third feature configuration, immediately after the ventilator is shut down from the operation in the positive pressure operation mode, the room pressure in the ventilation target room decreases with a positive pressure value that is smaller in absolute value than the positive pressure side set threshold room pressure. The room pressure of the ventilation target room is increasing at a negative pressure value that is smaller than the negative pressure side set threshold room pressure immediately after the ventilation system is stopped from the operation in the negative pressure operation mode. In a certain transient state, the improper state is displayed. When the detection chamber pressure of the detecting means reaches normal pressure (generally atmospheric pressure) after the operation of stopping the ventilation apparatus, the improper state display is terminated. It is preferable to be able to recognize that the room to be ventilated is neither in the positive pressure state nor in the negative pressure state (in other words, the ventilation device is in the operation stop state).

[4] The fourth feature configuration of the present invention is the implementation of the second or third feature configuration,
In the state where the positive pressure operation mode is displayed on the display means, the positive pressure operation is performed when the detection chamber pressure of the detection means continues to be lower than the set threshold chamber pressure on the positive pressure side for a set dead time or longer. In the state where the mode display is stopped and the negative pressure operation mode is displayed, the state in which the detection chamber pressure of the detection means is higher than the set threshold chamber pressure on the negative pressure side continues for the set dead time or longer. In some cases, the display of the negative pressure operation mode is stopped.

  That is, in the implementation of the second or third feature configuration, the display of the positive pressure operation mode is stopped immediately when the detection chamber pressure by the detection means becomes lower than the set threshold chamber pressure on the positive pressure side, and the detection by the detection means When the negative pressure operation mode display is stopped immediately when the chamber pressure becomes higher than the set threshold chamber pressure on the negative pressure side, the positive pressure will be positive every time the chamber pressure changes due to opening / closing of the entrance / exit. The display of the pressure operation mode and the display of the negative pressure operation mode are temporarily stopped, and there is a risk that the person entering or leaving the room will have doubts.

  On the other hand, in the fourth characteristic configuration, when the state in which the detection chamber pressure is lower than the set threshold chamber pressure on the positive pressure side continues for the set dead time or longer, the display of the positive pressure operation mode is stopped, The negative pressure operation mode display stops when the pressure is higher than the set threshold chamber pressure on the negative pressure side for more than the set dead time, that is, the detection chamber pressure is higher than the set threshold chamber pressure on the positive pressure side. When the duration of the low state is shorter than the set dead time, the display of the positive pressure operation mode is continued, and the duration when the detection chamber pressure is higher than the set threshold chamber pressure on the negative pressure side is set dead. Since the negative pressure operation mode display is continued when the time is shorter than the time, if an appropriate time is set as the set dead time, the positive pressure operation mode is displayed every time the room pressure fluctuates due to opening / closing of the entrance / exit. Display and display of negative pressure operation mode are temporary Be able to effectively avoid unstable phenomena such as the like is stopped, it is possible to effectively avoid inspire unnecessary suspicion to entering and leaving and others.

  In the implementation of the fourth characteristic configuration, the positive pressure side set dead time as the stop reference for the positive pressure operation mode display and the negative pressure side set dead time as the stop reference for the negative pressure operation mode display are set to different times. Moreover, it is preferable that the setting dead time on the positive pressure side and the negative pressure side can be appropriately changed by the administrator.

  Further, when the fourth feature configuration is performed in parallel with the third feature configuration, the state in which the detection chamber pressure is lower than the set threshold chamber pressure on the positive pressure side in the state where the positive pressure operation mode is displayed is not set. When it continues for more than the time, the positive pressure operation mode display is stopped, the inappropriate state is displayed, and the negative pressure operation mode is displayed, and the detection chamber pressure is higher than the set threshold chamber pressure on the negative pressure side. It is preferable to take a form in which the negative pressure operation mode display is stopped and the inappropriate state display is performed at the time when the higher state continues for the set dead time or longer.

[5] A fifth characteristic configuration of the present invention is any one of the second to fourth characteristic configurations,
When the detection chamber pressure of the detection means is a negative pressure value in a situation where the execution instruction of the positive pressure operation mode is given to the switching means, and the negative pressure operation mode for the switching means. In the situation where the execution command is given, when the detection chamber pressure of the detection means is a positive pressure value, a warning display is provided.

  That is, in the implementation of the second to fourth feature configurations, basically, when the room pressure of the ventilation target room is a negative pressure value, the negative pressure operation mode is displayed or the inappropriate state is displayed, and the room of the ventilation target room is displayed. When the pressure is a positive pressure value, the positive pressure operation mode is displayed or an inappropriate state is displayed, but the room pressure of the ventilation target room is displayed even though the execution command of the positive pressure operation mode is given to the switching means. In some cases, it is a serious problem that the chamber pressure in the ventilation target room is a positive pressure value even though a negative pressure operation mode execution command is given to the switching means. In these abnormal states, a simple negative pressure operation mode display or a simple positive pressure operation mode display is erroneous even if the display matches the actual room pressure state. Equal to the display, Can not be distinguished above-mentioned and merely transient and minor fault conditions and these abnormal conditions, Therefore, there is a fear that response delay with respect to occurrence of such abnormal condition.

  On the other hand, according to the fifth feature configuration, the occurrence of the abnormal state as described above can be recognized more surely and quickly by the warning display by the display means, and the occurrence of the abnormal state can be more accurately and promptly handled. can do.

  In the implementation of the fifth characteristic configuration, the warning display indicates, for example, the positive pressure operation mode and the negative pressure operation mode by selectively lighting the positive pressure side indicator lamp and the negative pressure side indicator lamp, and the positive indicator. By selectively flashing between the pressure side indicator and the negative pressure side indicator, an inappropriate state on the positive pressure side and an inappropriate state on the negative pressure side are displayed. On the other hand, both the positive side indicator and the negative side indicator light flash. If it can be distinguished from the positive pressure operation mode display and the negative pressure operation mode display, such as a display form or a warning display with blinking of a dedicated indicator lamp, an inappropriate state display is also performed. In this case, various display forms can be employed as long as the display can be identified as the display of the inappropriate state.

[6] The sixth feature configuration of the present invention is the implementation of the first feature configuration,
The display means displays a positive pressure operation mode based on a positive pressure operation mode execution command given to the switching means, and a negative pressure based on a negative pressure operation mode execution command given to the switching means. The configuration is such that the operation mode is displayed.

  That is, according to the sixth feature configuration, the positive pressure operation mode and the negative pressure operation mode are displayed based on the execution command of the positive pressure operation mode and the execution command of the negative pressure operation mode given to the switching means. Compared with the method of displaying each mode based on the room pressure of the ventilation target room detected by the detection means, the equipment configuration can be simplified and the equipment cost can be reduced.

[7] The seventh feature configuration of the present invention is the implementation of the sixth feature configuration.
The display means displays the positive pressure operation mode when a set delay time has elapsed from the time when the ventilation device is started in the positive pressure operation mode, and the ventilation device starts operation in the negative pressure operation mode. The negative pressure operation mode is displayed when the set delay time has elapsed from the point in time.

  In other words, in the seventh feature configuration, after starting the operation of the ventilator in the positive pressure operation mode, the time required for the ventilation target room to reach the required positive pressure state, or the operation of the ventilator in the negative pressure operation mode is started. After that, by setting the time required for the ventilation target room to reach the required negative pressure state as the set delay time, the ventilator simply uses the positive pressure operation mode and the negative pressure mode as in the case of the second characteristic configuration described above. It is not perceived as to which operation mode is the pressure operation mode, the ventilation target room is in the required positive pressure state or near positive pressure state, and the ventilation target room is in or near the required negative pressure state Each of the negative pressure states can be accurately recognized by the display of the positive pressure operation mode and the display of the negative pressure operation mode by the display means.

  Thus, for example, the ventilation target room should be opened immediately after the ventilation apparatus is started to operate in the positive pressure operation mode even though the room to be ventilated should enter and exit in a situation where the positive pressure state is required. Inconvenience such as inadvertently entering or leaving the room when the required positive pressure state or a positive pressure state close to it has not yet been reached, or conversely, the room to be ventilated enters or leaves the room under the required negative pressure state. In spite of this, it is necessary to enter and leave the room inadvertently at the stage where the ventilation target room has not yet reached the required negative pressure state or a negative pressure state close to it immediately after the ventilator is started in the negative pressure operation mode. It is possible to effectively prevent inconveniences such as inconvenience.

  As in the second feature configuration, the seventh feature configuration maintains the room pressure of the ventilation target room at the set target chamber pressure on the positive pressure side in the operation in the positive pressure operation mode, and operates in the negative pressure operation mode. Is particularly suitable when adopting a method for controlling the ventilator so that the room pressure of the room to be ventilated is kept at the set target room pressure on the negative pressure side. In this case, the setting is made so as to correspond to the change of the set target room pressure. It is recommended that the administrator can change the delay time.

  In the implementation of the seventh characteristic configuration, the positive pressure side set delay time when the positive pressure operation mode is displayed and the negative pressure side set delay time when the negative pressure operation mode is displayed are different from each other. In the case of adopting the above-described room pressure control method that maintains the target room pressure at the positive pressure side and the negative pressure side for the ventilation target room, the set delay times on the positive pressure side and the negative pressure side are set in accordance with the change of the set target room pressure. It is preferable to adopt a configuration in which the value is automatically changed to a value corresponding to the new set target chamber pressure.

[8] The eighth feature configuration of the present invention is any one of the first to seventh feature configurations,
The display means is configured to emit a notification sound for notifying the switching when the display is switched.

  In other words, according to the eighth feature configuration, the notification sound is generated when the display is switched, so that the room to be ventilated is in a new state suitable for the subsequent use more reliably to the person entering and leaving the room. Accordingly, it is possible to more effectively prevent inconvenience due to the above-described misidentification.

  FIG. 1 shows air conditioning equipment for an operating room 1 as a ventilation target room. Reference numeral 2 denotes an air conditioner that adjusts the temperature and humidity of the outside air OA taken from outside through the outside air introduction path 3. SA is supplied to the operating room 1 through the air supply path 4 by the air supply fan Fs, and the air in the operating room 1 is exhausted to the outside as exhaust EA through the exhaust path 6 by the exhaust fan Fe in parallel with the supply air. As a result, the operating room 1 is ventilated and maintained in a required temperature and humidity state.

  7 is a corridor facing the entrance 8 of the operating room 1, and the exhaust fan Fe exhausts the air in the corridor 7 through the branch exhaust passage 9 together with the indoor air of the operating room 1 by the operation.

  The air supply path 4 is provided with a constant air volume device 10 that automatically adjusts the supply air volume to the operating room 1 to the set air volume Qs, and a filter 11 that purifies the supply air SA to the operating room 1. A filter 12 for purifying the exhaust air EA to the outside is provided, and the outside air introduction path 3, the exhaust path 6, and the branch exhaust path 9 are respectively stopped when the supply fan Fs and the exhaust fan Fe are stopped (that is, When the ventilation operation for the operating room 1 is stopped), an open / close damper 13 for interrupting the paths 3, 6, and 9 is interposed.

  14 is a room pressure sensor for detecting the room pressure p in the operating room 1 (in this example, the differential pressure between the air pressure in the operating room 1 and the air pressure in the corridor 7), 15 is a negative / positive pressure changeover switch provided in the room of the operating room 1, Reference numeral 16 denotes a control device. The control device 16 performs start / stop operations of the fans Fs and Fe, start / stop operation of the air conditioner 2, and opening / closing operation of the open / close damper 13 in accordance with an applied start / stop command. The temperature / humidity adjustment output of the air conditioner 2 is adjusted so that the temperature / humidity of the chamber 1 is maintained at the set temperature / humidity.

  In addition, the control device 16 uses the constant air volume device 10 to make the supply air volume to the operating room 1 constant at the set air volume Qs, while fan output control such as inverter control is performed based on the detection chamber pressure p of the chamber pressure sensor 14. The supply / exhaust amount balance of the operating room 1 is adjusted by adjusting the air flow rate Qe of the exhaust fan Fe, and the room pressure p of the operating room 1 is automatically adjusted to the target room pressure set by the setting device 17.

  As the target chamber pressure, the positive-pressure side target chamber pressure pma that makes the air pressure in the operating room 1 higher than the air pressure in the hallway 7 by a predetermined difference in the above-described chamber pressure adjustment and the air pressure in the operating room 1 are higher than the air pressure in the hallway 7. The controller 16 sets a binary value with the target chamber pressure pmb on the negative pressure side to be lowered by a predetermined difference. On the other hand, the controller 16 operates the negative / positive pressure changeover switch 15 to the positive pressure designation side. In the situation (that is, the situation where the execution command of the positive pressure operation mode is given), as the operation in the positive pressure operation mode, the room pressure of the operating room 1 is adjusted by adjusting the exhaust fan air flow rate Qe based on the detection room pressure p. In the situation where p is adjusted to the set target chamber pressure pma on the positive pressure side, while the negative / positive pressure changeover switch 15 is operated to the negative pressure designation side (that is, the execution command of the negative pressure operation mode is given), Negative pressure operation mode By adjusting the exhaust fan blowing amount Qe based on the detection chamber pressure p as the operation in de are the configuration for adjusting the chamber pressure p of the operating room 1 to the set target chamber pressure pmb negative pressure side.

  That is, when it is necessary to prevent invasion of germs and dust into the room, the air pressure in the operating room 1 is increased by operating the positive / negative pressure changeover switch 15 to the positive pressure designation side and operating in the positive pressure operation mode. When it is necessary to keep the air pressure in the corridor 7 higher than the air pressure of the corridor 7 to prevent invasion of germs and dust into the operating room 1 by the pressure difference, and to prevent the pathogenic bacteria from leaking out of the room, the negative / positive pressure switch 15 By operating the negative pressure to the negative pressure operation mode, the air pressure in the operating room 1 is kept lower than the air pressure in the corridor 7 by a predetermined difference, and the pathogenic bacteria from the operating room 1 are caused by the differential pressure. Prevent leakage.

  As shown in FIG. 2, at the rim of the corridor side of the entrance 8 of the operating room 1, a positive pressure side indicator lamp 19 a indicating a positive pressure and a negative pressure side indicator lamp 19 b indicating a negative pressure are displayed together with an indicator lamp 18 indicating that the operation is in progress. As a switching operation of these positive pressure side and negative pressure side indicator lamps 19a and 19b, the control device 16 performs the operation in the situation where the negative / positive pressure changeover switch 15 is operated to the positive pressure designation side. Only when the detection chamber pressure p of the pressure sensor 14 is equal to or higher than the set threshold chamber pressure psa on the positive pressure side (in this example, a value equal to the set target chamber pressure pma on the positive pressure side), the negative pressure side indicator lamp 19b is turned off. The positive pressure side indicator lamp 19a is turned on, and conversely, in the situation where the negative / positive pressure changeover switch 15 is operated to the negative pressure designation side, the detection chamber pressure p of the chamber pressure sensor 14 is the set threshold chamber pressure psb ( In this example, the set target chamber pressure p on the negative pressure side Iff equal) below b, it is the construction of the negative pressure side indicator 19b are lit under unlit positive pressure side indicator 19a.

  That is, the selective lighting display of the positive pressure side indicator lamp 19a and the negative pressure side indicator lamp 19b indicates that the operating room 1 is in a positive pressure state and in a negative pressure state for those who enter the operating room 1. Each is surely recognized.

  Note that the positive pressure side set threshold chamber pressure psa, which is the reference for turning on / off the positive pressure side indicator lamp 19a, is equal to the positive pressure side set target room pressure pma in the room pressure control, and the reference for turning on / off the negative pressure side indicator lamp 19b. In this example in which a certain negative pressure side set threshold chamber pressure psb is set to a value equal to the negative pressure side set target chamber pressure pmb in the chamber pressure control, the setting device 17 changes the set target chamber pressures pma and pmb on the positive pressure side and the negative pressure side. Accordingly, the set threshold chamber pressures psa and psb on the positive pressure side and the negative pressure side are also changed.

  In short, in the present embodiment, the supply fan Fs and the exhaust fan Fe constitute a ventilation device for the ventilation target room 1 (operating room), and the negative / positive pressure changeover switch 15 and the control device 16 define the ventilation target room 1. Switching means for switching the operation mode of the ventilator between the positive pressure operation mode for positive pressure and the negative pressure operation mode for negative pressure in the ventilation target room 1 is configured, and the positive and negative pressure indicators 19a and 19b and the control are configured. The device 16 constitutes display means for displaying at the 8th entrance / exit of the ventilation target room 1 whether the ventilation device is in the positive pressure operation mode or the negative pressure operation mode.

  The display means is configured such that the room pressure p of the ventilation target chamber 1 detected by the room pressure sensor 14 as the detection means is a positive set threshold room pressure psa (= positive pressure set target room pressure pma on the room pressure control). Only when the positive pressure side indicator lamp 19a is turned on to display the positive pressure operation mode, and the room pressure p of the ventilation target room 1 detected by the room pressure sensor 14 is the set threshold room pressure psb (the negative pressure side). The negative pressure operation mode is displayed by turning on the negative pressure side indicator lamp 19b only when the negative pressure side setting target chamber pressure pmb) is equal to or lower than the negative pressure side in the room pressure control.

[Another embodiment]
Next, other embodiments of the present invention will be listed.

  In the above-described embodiment, when the chamber pressure p of the ventilation target chamber 1 detected by the detection means 14 is lower than the positive threshold pressure threshold chamber pressure psa and higher than the negative pressure threshold pressure chamber pressure psb, the positive pressure side In the example, both the indicator lamps 19a and 19b on the negative pressure side are turned off and both the positive pressure operation mode display and the negative pressure operation mode display are stopped. When the positive pressure value is smaller than the absolute value of psa, the positive pressure side indicator lamp 19a is flashed while the negative pressure side indicator lamp 19b is extinguished, and the inappropriate state on the positive pressure side is displayed. When the pressure p is a negative pressure value whose absolute value is smaller than the set threshold chamber pressure psb on the negative pressure side, the negative pressure side indicator lamp 19b is blinked under the extinguishing state of the positive pressure side indicator lamp 19a. May be displayed.

  Regarding the stop of the display of the positive pressure operation mode and the stop of the display of the negative pressure operation mode, the display of the positive pressure operation mode is immediately performed when the detection chamber pressure p of the detection means 14 becomes lower than the set threshold chamber pressure psa on the positive pressure side. And the display of the negative pressure operation mode is stopped immediately when the detection chamber pressure p of the detection means 14 becomes higher than the set threshold chamber pressure psb on the negative pressure side, or the detection chamber pressure of the detection means 14 When the state where p is lower than the set threshold chamber pressure psa on the positive pressure side continues for the set dead time Tfa on the positive pressure side, the display of the positive pressure operation mode is stopped, and the detection chamber pressure p of the detection means 14 is negative. The method of stopping the display of the negative pressure operation mode when the state where the pressure side is higher than the set threshold chamber pressure psb continues for the negative pressure side set dead time Tfb (that is, a method of suppressing frequent pause of display). Adopt any Good.

  Further, the detection is performed under the condition that the detection chamber pressure p of the detecting means 14 becomes a negative pressure value under the situation where the execution command for the positive pressure operation mode is given, and under the situation where the execution command for the negative pressure operation mode is given. When an abnormality occurs when the detection chamber pressure p of the means 14 becomes a positive pressure value, a warning display may be performed by blinking both the positive pressure side and the negative pressure side indicator lamps 9a and 9b.

  When the positive pressure operation mode and the negative pressure operation mode are displayed based on the room pressure p of the ventilation target room 1 detected by the detection means 14, the detection target room pressure p is determined by the air pressure and the corridor in the ventilation target room 1. It is not limited to the differential pressure with the air pressure in the adjacent chamber, such as the differential pressure between the air pressure in the ventilation target chamber 1 and the atmospheric pressure, or the differential pressure between the air pressure in the ventilation target chamber 1 and the absolute reference pressure. There may be.

  In each of the above examples, the method of displaying the positive pressure operation mode and the negative pressure operation mode based on the room pressure p of the ventilation target chamber 1 detected by the detection means 14 has been shown. Execution command for the positive pressure operation mode and execution command for the negative pressure operation mode (that is, an operation on the positive pressure designation side or an operation on the negative pressure designation side given to the negative / positive pressure changeover switch 15 in the above embodiment) ), The positive pressure operation mode and the negative pressure operation mode may be displayed.

  Further, when displaying each of the positive pressure operation mode and the negative pressure operation mode based on the mode execution command given to the switching means in this way, the positive pressure operation mode is set when the execution command for the positive pressure operation mode is given. Display and display the negative pressure operation mode when the execution command of the negative pressure operation mode is given, or the positive pressure operation mode when the operation of the positive pressure operation mode is actually started Display and display method of negative pressure operation mode when operation in negative pressure operation mode is actually started, or set delay on the positive pressure side from the start of operation in positive pressure operation mode The positive pressure operation mode is displayed when the time Tda has elapsed, and the negative pressure operation mode is displayed when the negative pressure side set delay time Tdb has elapsed since the start of the operation in the negative pressure operation mode. Direction Any one of the may be adopted.

  In each of the above examples, the positive pressure operation mode display, the negative pressure operation mode display, the improper state display, and the warning display are each performed by the display lamps 19a and 19b. In addition to the display according to the above, various display methods can be adopted, and in the display by the indicator lamps 19a and 19b, a notification sound for notifying the change may be generated when each display is switched.

  Ventilation target room 1 is not limited to an operating room, and may be a hospital room, a production clean room, a research clean room, or the like.

  In various facilities such as medical facilities, production facilities, and research facilities, it can be used when a room to be ventilated for various uses is switched between a positive pressure state and a negative pressure state.

Diagram showing air conditioning equipment for operating room Diagram showing the entrance and exit of the operating room

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilation target room Fs Ventilator Fe Fe ventilator 8 Inlet part, outlet part 14 Detection means 15 Switching means 16 Switching means 19a Display means 19b Display means p Room pressure psa Positive pressure side set threshold room pressure psb Negative pressure side set threshold room pressure Tfa Positive pressure side set dead time Tfb Negative pressure side set dead time Tda Positive pressure side set delay time Tdb Negative pressure side set delay time

Claims (8)

Negative / positive pressure switching type ventilation provided with switching means for switching the operation mode of the ventilation device for the ventilation target room between a positive pressure operation mode in which the ventilation target room is positive pressure and a negative pressure operation mode in which the ventilation target room is negative pressure Equipment,
A negative / positive pressure switching type ventilation facility provided with display means for displaying at the entrance or exit of the ventilation target room whether the ventilation device is in a positive pressure operation mode or a negative pressure operation mode.   Provided detection means for detecting the room pressure of the ventilation target room, the display means, the positive pressure operation mode is displayed only when the detection chamber pressure of the detection means is equal to or higher than a set threshold room pressure on the positive pressure side, and 2. The negative / positive pressure switching type ventilation system according to claim 1, wherein the negative pressure operation mode is displayed only when the detection chamber pressure of the detection means is equal to or lower than a set threshold chamber pressure on the negative pressure side.   When the detection chamber pressure of the detection unit is a positive pressure value whose absolute value is smaller than the set threshold chamber pressure on the positive pressure side, and the detection chamber pressure of the detection unit is the set threshold chamber pressure on the negative pressure side. 3. The negative / positive pressure switching type ventilation equipment according to claim 2, wherein when the negative pressure value is smaller than the absolute value, an inappropriate state is displayed.   In the state where the positive pressure operation mode is displayed on the display means, the positive pressure operation is performed when the detection chamber pressure of the detection means continues to be lower than the set threshold chamber pressure on the positive pressure side for a set dead time or longer. In the state where the mode display is stopped and the negative pressure operation mode is displayed, the state in which the detection chamber pressure of the detection means is higher than the set threshold chamber pressure on the negative pressure side continues for the set dead time or longer. 4. The negative / positive pressure switching type ventilation equipment according to claim 2 or 3, wherein display of the negative pressure operation mode is stopped.   When the detection chamber pressure of the detection means is a negative pressure value under a situation where the execution instruction of the positive pressure operation mode is given to the switching means, and the negative pressure operation mode for the switching means. The negative / positive pressure switching type according to any one of claims 2 to 4, wherein a warning display is provided when the detection chamber pressure of the detection means is a positive pressure value in a situation where the execution command is given. Ventilating facilities.   The display means displays a positive pressure operation mode based on a positive pressure operation mode execution command given to the switching means, and a negative pressure based on a negative pressure operation mode execution command given to the switching means. The positive / negative pressure switching type ventilation equipment according to claim 1, wherein the operation mode is displayed.   The display means displays the positive pressure operation mode when a set delay time has elapsed from the time when the ventilation device is started in the positive pressure operation mode, and the ventilation device starts operation in the negative pressure operation mode. 7. The negative / positive pressure switching type ventilation equipment according to claim 6, wherein a negative pressure operation mode is displayed when a set delay time has elapsed from the time when the negative pressure is switched. The negative / positive pressure switching type ventilation equipment according to any one of claims 1 to 7, wherein the display means is configured to emit a notification sound for notifying the switching when the display is switched.

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