JP2898944B2 - Air-conditioning system for controlling space pressure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for controlling the internal pressure of a space, and more particularly, to connecting a plurality of air-conditioned spaces in parallel to a blower through an air supply path. At the same time, the exhaust gas is connected in parallel with the exhaust path, and the flow control dampers are interposed in each of the branch sections of the air supply path that are separately connected to the air-conditioned space. An automatic flow controller is provided to adjust the amount of air supplied to each of the air conditioned spaces within a set range, and a pressure adjusting damper is provided at each of the branch portions of the exhaust path that are separately connected to the air conditioned space. The present invention relates to a space internal pressure control air conditioner provided with an automatic pressure regulator that is interposed and adjusts the opening degree of these pressure adjusting dampers to maintain the internal pressure of each of the air conditioned spaces within a set range. 2. Description of the Related Art Conventionally, as an air conditioner of this type, as disclosed in Japanese Patent Application Laid-Open No. 59-38541, a flow control damper interposed at a branch portion of an air supply passage, and , Each of the pressure adjusting dampers interposed at the branch of the exhaust path,
The over-open signal contacts that are closed by the damper blades when the dampers are over-open (the cross-sectional area of the flow path is maximum), and the dampers when the dampers are fully opened (the cross-sectional area of the flow path is one step before the maximum). A fully open signal contact that is closed by the wings is provided, and based on the signals generated by the overopen signal contact and the fully open signal contact, on the supply side, on the opening control of the flow adjustment damper by the automatic flow controller, When none of the flow control dampers is fully opened (that is, when the largest flow control damper of the flow control damper is not fully opened), the blowing capacity of the blower is reduced, In addition, when one of the flow control dampers is over-opened (that is, when the opening of the flow control damper having the largest opening among the flow control dampers is over-opened), the blower Blast Implementing the air volume control to increase the force. Similarly, on the exhaust side, when none of the pressure adjusting dampers is fully opened (ie, the opening of the pressure When the degree of opening of the large pressure adjustment damper does not reach the full open position, the exhaust capacity of the exhaust fan is reduced, and when one of the pressure adjustment dampers is excessively opened (that is, the pressure adjustment damper is not fully opened). (When the opening of the pressure adjustment damper with the largest opening is too open)
In order to implement the exhaust air volume control to increase the exhaust capacity of the exhaust fan,
As a result, there is a type in which the flow rate adjusting damper and the pressure adjusting damper are used with as low a pressure loss as possible to reduce the power consumption of the blower and the exhaust fan to save energy. [0003] However, since this type of air conditioner is intended to maintain the internal pressure of each space to be air-conditioned within a set range, it is necessary to adjust the flow rate on the air supply side. Among the opening control of the damper and the exhaust-side pressure adjusting damper, the internal pressure adjustment by controlling the opening of the pressure adjusting damper is the most important matter for determining the performance of the apparatus.
In the above-described conventional apparatus, the pressure adjustment damper having the largest opening of the pressure adjustment dampers is not fully opened until the opening of the pressure adjustment damper is excessively opened. Only after the internal pressure adjustment by increasing the degree of opening has become physically impossible, the exhaust capacity of the exhaust fan is adjusted to increase to eliminate the situation. Whenever the opening of the pressure adjusting damper having the largest opening becomes excessively open, the air conditioning target space for which the pressure adjusting damper is subjected to internal pressure adjustment is in a state equal to the internal pressure uncontrolled state, even temporarily. Was. [0004] A control method for adjusting the air discharge capacity of the exhaust fan so that the opening degree of the largest opening degree of the pressure adjusting dampers is maintained in the range between the full opening position and the over opening position. Because of this, the opening of other pressure adjusting dampers other than the one with the largest opening among the pressure adjusting dampers becomes a considerably small opening for some reason, and the internal pressure controllability of the pressure adjusting damper is considerably large. When it gets worse,
Even if the opening of the pressure adjustment damper with the largest opening is close to the fully open position described above and there is still room to adjust the exhaust capacity of the exhaust fan to the decreasing side, the opening of the pressure adjustment damper with the largest opening As long as the degree is in the range between the fully-open position and the over-open position, the adjustment to the reduction side of the exhaust air capacity is not performed, and the internal pressure controllability of the pressure adjustment dampers other than the one with the largest opening degree is not adjusted. Is often left in a considerably deteriorated state, and in these respects, the conventional device has a problem that the internal pressure controllability for the space to be air-conditioned is still low. SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to control a blower and a blower with a rational control method based on the detection opening of a flow rate adjustment damper on an air supply side and a pressure adjustment damper on an exhaust side. By doing so, the internal pressure controllability for the air-conditioned space is improved. According to a first feature of the present invention, a plurality of air-conditioned spaces are connected in parallel to a blower by an air supply path and are connected in parallel to an exhaust fan by an exhaust path. And a flow control damper is interposed at each of the branch portions of the air supply path separately connected to the air-conditioned space, and the opening of the flow control damper is adjusted to adjust the air-conditioned space. An automatic flow controller is provided to maintain the air supply amount for each of the air supply units within a set range, and a pressure adjusting damper is interposed in each of the branch portions of the exhaust path separately connected to the air-conditioned space, and these pressures are controlled. In a configuration in which an automatic pressure regulator that adjusts the opening of the adjustment damper to maintain the internal pressure of each of the air-conditioned spaces within a set range is provided, based on a detection opening of the flow adjustment damper, the flow adjustment damper is provided. Out of An air volume control means for adjusting the air volume of the blower is provided so as to maintain the opening of the flow rate adjusting damper having the largest opening in the set opening range on the air supply side, and An exhaust air amount control means for adjusting the exhaust air amount of the exhaust fan so as to maintain the opening degrees of all the pressure adjusting dampers in the set intermediate opening degree range on the exhaust side based on the detected opening degree. According to a second characteristic configuration of the present invention, in the first characteristic configuration, an opening setter for setting the set opening range on the air supply side and the set intermediate opening range on the exhaust side is provided. On the point. [Operation] In the first characteristic configuration, the flow rate of the intervening air at each branch of the air supply passage is controlled by the automatic flow controller so that the air supply amount to the plurality of air-conditioned spaces is maintained within the set range. The opening of the damper for adjustment is adjusted, and the opening of the damper for flow adjustment having the largest opening of the dampers for flow adjustment is adjusted based on the detected opening of the damper for flow adjustment. The blowing amount of the blower is adjusted by the blowing amount control means so as to maintain the opening degree range on the air supply side. And also, the opening degree control of the flow rate adjusting damper on the air supply side, and
In parallel with the blower volume control of the blower, on the exhaust side, to maintain the internal pressure of each of the plurality of air-conditioned spaces within a set range,
The automatic pressure adjuster adjusts the opening of the pressure adjusting dampers provided at each branch of the exhaust path, and adjusts the opening of these pressure adjusting dampers based on their detected openings. The exhaust air amount of the exhaust fan is adjusted by the exhaust air amount control means so that the opening degree of the adjustment damper is maintained in the set intermediate opening degree range on the exhaust side. [0009] In the second characteristic configuration, the set opening range on the air supply side and the set intermediate opening range on the exhaust side in the air volume control and the exhaust air volume control (that is, the target flow rate in the air volume control). The target opening range of the adjustment damper having the largest opening, and the target intermediate opening range of all the pressure adjustment dampers targeted by the exhaust air amount control described above, The setting can be made by an opening degree setting device according to the damper characteristics of the adjustment damper. [Effects of the Invention] According to the first characteristic configuration of the present invention, the exhaust air amount of the exhaust fan is adjusted so that the opening degrees of all the pressure adjusting dampers are maintained in the set intermediate opening degree range on the exhaust side. From that, when the largest opening of the pressure adjustment damper reaches the upper limit opening of the exhaust-side set intermediate opening range, at that time there is still a demand for increasing the exhaust air volume in internal pressure adjustment, Even without waiting for the exhaust fan to adjust to the exhaust air volume increasing side, the pressure adjustment damper temporarily exceeds the upper limit of the set intermediate opening range and moves to the opening side, so that it can respond immediately, and After that, as an effect of adjusting the exhaust air amount to the exhaust air amount increasing side, the opening degree of the pressure adjusting damper having the largest opening degree can be returned to within the set intermediate opening degree range on the exhaust side, thereby, Like the conventional device, the pressure adjustment dam with the largest opening Each time the opening of the pump reaches the over-open position, which is the upper limit of the set opening range, the air-conditioning target space whose internal pressure is to be adjusted by the pressure adjusting damper is equal to the internal pressure uncontrolled state, even temporarily. Can be avoided. [0011] Further, since the openings of all the pressure adjustment dampers are maintained within the set intermediate opening range on the exhaust side, only some of the pressure adjustment dampers have a considerably small opening for some reason. As for the lowering of the internal pressure controllability, all of the pressure adjusting dampers have the smallest opening degree, while the opening degree of the smallest opening degree falls below the lower limit opening degree of the set intermediate opening range. This can be prevented by adjusting the exhaust air volume of the exhaust fan to the decreasing side so that the opening of the damper is maintained within the set intermediate opening range. It is possible to reduce a situation in which a part of the lowered pressure adjusting damper is left as it is. In addition to maintaining the internal pressure of each air-conditioned space in a set range by controlling the opening of the pressure adjusting damper on the exhaust side and controlling the amount of exhaust air from the exhaust fan as described above, By controlling the opening degree of the damper for adjusting the flow rate in, the air supply amount for each space to be air-conditioned is maintained within the set range, preventing internal pressure fluctuations due to air supply amount fluctuations and setting the internal pressure of each air-conditioned space more stably. The exhaust pressure, which is the internal pressure adjustment side, should be adjusted so that the exhaust air amount of the exhaust fan is adjusted so that the openings of all the pressure adjustment dampers are within the set intermediate opening range. On the air supply side, on the other hand, a method that adjusts the air flow rate of the blower so as to maintain the opening of the flow adjustment damper with the largest opening in the flow adjustment damper within the set opening range (That is, the largest degree of opening If the flow control dampers other than the flow control dampers are below the lower limit of the set opening range, the blower volume is not adjusted, so the opening of all dampers is set to the set opening range. Air flow rate can be changed less frequently than the exhaust-side method that maintains the air flow). It is possible to suppress the internal pressure of each space to be air-conditioned fluctuating due to the influence of the fluctuation. That is, from the above, according to the first aspect of the present invention, the controllability of the internal pressure in each space to be air-conditioned is improved and the internal pressure in each space to be air-conditioned is improved more accurately than in the above-described conventional apparatus. And it can be stably maintained in the set range. According to the second characteristic configuration of the present invention, the set opening range on the supply side and the set intermediate opening range on the exhaust side can be set by the opening degree setting device in the above-mentioned air volume control and exhaust air volume control. In setting these opening ranges, it is possible to eliminate the necessity of assembling the over-open signal contacts and the fully-open signal contacts required for the above-described conventional device to the damper. Depending on the characteristics and the characteristics of the damper used as the pressure adjusting damper, it is possible to easily set an appropriate supply-side set opening range and an exhaust-side set intermediate opening range on the internal pressure control,
Improvement of the internal pressure controllability can be more reliably and effectively achieved. FIG. 1 and FIG. 2 show an air conditioner for controlling the internal pressure of a space, and a plurality of air-conditioned spaces 1a, 1b, 1c.
To the air conditioner 2 and the variable capacity blower 3
, And connected in parallel to the variable-capacity exhaust fan 5 via an exhaust passage 6, whereby each of the air-conditioned spaces 1a, 1b, 1c is forcibly ventilated. The air-conditioned spaces 1a, 1b,
Each of the branch portions 4a, 4b, 4c separately connected to 1c is provided with a flow control damper 8, and the detected flow rate of the flow rate detection sensor S1 (that is, air supply to each of the air-conditioned spaces 1a, 1b, 1c). The automatic operation unit 9 is provided with an automatic flow controller A for adjusting the opening of the flow control damper 8 so as to maintain the flow rate) in the range set by the flow controller 7 of the system controller C. The air-conditioned spaces 1a, 1a,
A first pressure adjustment damper 14 and a second pressure adjustment damper 15 are interposed in each of the branch portions 6a, 6b, 6c separately connected to 1b, 1c, respectively.
The pressure detected by the pressure detection sensor S3 with respect to the inside of the a, 1b, 1c (that is, the internal pressure of each of the air-conditioned spaces 1a, 1b, 1c) is determined by the pressure setting unit 1 of the system controller C.
3, the first pressure adjusting damper 14 and the second pressure adjusting damper 1
5 is provided with an automatic pressure regulator B for adjusting the opening degree. The first pressure adjusting damper 14 is formed so as to have a large pressure adjusting width from fully closed to fully open, and the second pressure adjusting damper 15 has an extremely small pressure adjusting width from fully closed to fully opened. It is formed so that
Thereby, by maintaining the internal pressure of each of the air-conditioned spaces 1a, 1b, 1c by adjusting the opening of the first pressure adjustment damper 14 and the second pressure adjustment damper 15 by the automatic operation unit 16, The first pressure adjustment damper 14 performs rough pressure adjustment, whereas the second pressure adjustment damper 15 performs precise pressure adjustment. On the air supply side, an opening detection sensor S2 on the air supply side for detecting the opening of the flow adjustment damper 8 is provided for each of the flow adjustment dampers 8, and in contrast thereto, Based on the detection opening of the air supply side opening detection sensor S2, the largest of the detection openings of the air supply side opening detection sensor S2 (that is, the flow opening of the flow adjustment damper 8 having the largest opening). (The opening degree of the degree adjusting damper 8) is maintained by the air supply side opening detection sensor S2 as the air supply amount control means 10 and 12 for adjusting the air supply amount of the blower 3 so as to maintain the opening degree range on the air supply side. Judging means 10 for judging the largest one of the openings, and adjusting the amount of air blown by blower 3 so that the maximum detected opening reported from this judging means 10 is maintained within the set opening range on the air supply side. Automatic air flow adjustment means 1
2 is provided in the system controller C, and the air supply side opening range setting device 11 for setting the air supply side setting opening range is provided in the system controller C. On the other hand, on the exhaust side, each of the first pressure adjusting dampers 14 is
The exhaust-side opening detection sensor S4 for detecting the opening of the exhaust-side opening detection sensor S4 is attached to the exhaust-side opening detection sensor S4. Exhaust amount control means 1 for adjusting the amount of exhaust air of the exhaust fan 5 so that the opening degree) is maintained within the set intermediate opening degree range on the exhaust side.
8 and 19, a judging unit 18 for judging whether or not all of the openings detected by the exhaust side opening sensor S4 are within the set intermediate opening range on the exhaust side, and based on information from the judging unit 18. The system controller C is provided with an exhaust air amount automatic adjusting means 19 for adjusting the exhaust air amount of the exhaust fan 5 so as to maintain all of the detected openings in the set intermediate opening range on the exhaust side,
Further, an exhaust-side opening degree setting device 17 for setting the set intermediate opening degree range on the exhaust side is provided in the system controller C. That is, according to the above configuration, the automatic flow controller A controls each branch portion of the air supply passage 4 so as to maintain the air supply amount to the plurality of air-conditioned spaces 1a, 1b, 1c within the set range. The opening of the interposed flow rate adjusting dampers 8 is adjusted at 4a, 4b and 4c, and the opening degree of the flow rate adjusting dampers 8 is adjusted based on the detected opening degree. Flow control damper 8 with the largest opening
The blowing amount of the blower 3 is adjusted by the blowing amount control means 10 and 12 so that the opening degree is maintained in the set opening range on the air supply side. Further, in parallel with the control of the opening of the flow rate adjusting damper 8 on the air supply side and the control of the amount of air blown by the blower 3, a plurality of air-conditioned spaces 1a, 1
In order to maintain the internal pressure of each of b, 1c within the set range, the automatic pressure regulator B controls each of the branch portions 6a, 6a of the exhaust path 6.
b, 6c interposed first and second pressure adjusting dampers 14,
The opening of the damper 15 is adjusted.
4 and 15, the first pressure adjusting damper 14
The exhaust air amount of the exhaust fan 5 is adjusted by the exhaust air amount control means 18 and 19 so that the opening degrees of all the first pressure adjusting dampers 14 are maintained in the set intermediate opening degree range on the exhaust side based on the detected opening degree. You. Further, the set opening degree range on the air supply side and the set intermediate opening degree range on the exhaust side in the air volume control and the air volume control (that is, the most of the flow rate adjusting dampers 8 targeted by the air volume control). A target opening range for a large opening, and a target intermediate opening range for all the first pressure adjusting dampers 14 targeted by the exhaust air amount control.
The setting of the opening degree setting device 1 on the supply side and the exhaust side
1, 17 so that good internal pressure controllability can be obtained.
It is set appropriately in accordance with the damper characteristics of each of the dampers 8, 14. The shutoff valves 2 are provided at all of the branch portions 4a, 4b, 4c of the air supply passage 4 and the branch portions 6a, 6b, 6c of the exhaust passage 6.
0, 21 are provided, whereas the air-conditioned spaces 1a, 1
b and 1c for the supply side and exhaust side shutoff valves 20 and 2 respectively.
A first timer for providing a supply / exhaust operation unit 23 for opening / closing the air conditioner 1 and suspending supply / exhaust to and from a part of the air-conditioned spaces 1a, 1b, 1c for a certain time based on information from the supply / exhaust operation unit 23 24 and outlet 2
Air-conditioned space 1a, 1 by heating fumigator connected to 5
The system controller C is provided with a second timer 26 for continuing the disinfection in b and 1c for a fixed time. Then, the air supply stop of the air supply side opening detection sensor S2 attached to the flow rate adjusting damper 8 is continued for a predetermined time by a command from the first timer 24 based on the information from the air supply / exhaust operation unit 23. Air-conditioned spaces 1a, 1 in the state
The system controller C is provided with information selection instructing means 27 for instructing the judging means 10 on the air supply side so as to exclude the detected opening degree from those for b and 1c from the judgment object.
Thereby, the amount of air blown by the blower 3 is reduced with the stop of air supply to a part of the air-conditioned spaces 1a, 1b, 1c. The exhaust side opening detection sensor S4 attached to the first pressure adjusting damper 14 for a certain period of time in response to a command from the first timer 24 based on information from the supply / exhaust operation unit 23 for stopping the exhaust. Air conditioning target space 1a in the state,
The system controller C is provided with information selection instructing means 28 for instructing the judging means 18 on the exhaust side so as to exclude the detected opening degree of the air-conditioning target spaces 1a, 1b so as to exclude the detected opening degrees from the objects 1b, 1c. , 1c, the pressure control system can be prevented from becoming uncontrollable due to the stoppage of the exhaust. A circulation path 29 for returning a part of the exhaust gas from the downstream side of the exhaust fan 5 to the upstream side of the air conditioner 2 is provided, and throttle valves 30 and 31 of the air supply path 4 and the exhaust path 6 and an opening / closing valve of the circulation path 29 are provided. 32, and a third timer 34 for instructing the automatic valve operation unit 33 based on information from the supply / exhaust stop operation unit 23 is provided in the system controller C. The valves 30 and 31 are set to a small opening degree, the on-off valve 32 is fully opened, and the air-conditioned spaces 1a, 1b,
From the third timer 34, the throttle valves 30 and 31 are fully opened and the on-off valve 32 is fully closed for a certain period of time immediately before a part of 1c is switched from the supply / exhaust state to the supply / exhaust state. The throttle valve 3 is controlled by the automatic valve operation unit 33 according to instructions.
0, 31 and the on-off valve 32 are operated. That is, all the air-conditioned spaces 1a, 1b,
When the air is supplied to and exhausted from the air-conditioning device 1c, the air-conditioning load is reduced by circulating a part of the exhaust gas. On the other hand, a part of the air-conditioned spaces 1a, 1b, and 1c is switched from the air supply and exhaust stop state to the air supply state. Immediately after that, the air containing disinfectant and the contaminated air from the air-conditioned spaces 1a, 1b, and 1c for the resumption of air supply / exhaust flow from the circulation passage 29 to the other air-conditioned spaces 1a, 1a.
b, 1c. In short, when a supply / exhaust stop instruction is given to some of the air-conditioned spaces 1a, 1b, 1c by the supply / exhaust operation unit 23, the air-conditioned spaces 1a, 1b, 1c are automatically controlled as follows. It is configured so that it can be treated. (A) Shutoff valves 20 and 21 on the supply and exhaust sides
Is closed slowly, and supply and exhaust are stopped. (B) After the supply and exhaust are stopped, the outlet 25 is energized, and the air-conditioned spaces 1a, 1b, 1c are disinfected by fumigation. (C) Fumigation is stopped after a certain time. (D) The circulation path 29 is shut off before the resumption of air supply and exhaust. (E) After shutting off the circulation path 29, the shutoff valves 2 on the air supply side and the exhaust side
0 and 21 are slowly opened, and the supply and exhaust are resumed. (F) When a certain period of time has passed after resuming air supply and exhaust,
9 is fully opened and returns to the normal state. [Another Embodiment] Next, another embodiment of the present invention will be listed. Air-conditioned space 1
a, 1b, and 1c may be, for example, a biotechnology-related laboratory, a laboratory animal breeding room, a work clean room, or any other room. Various changes such as adjustment of room pressure, cooling and heating are possible. The air conditioner 2 may be omitted during ventilation or room pressure adjustment. In order to form the exhaust fan 5 of a variable capacity type or the like, an appropriate specific structure can be selected, such as changing the rotation speed and the vane angle. The specific structure and control method of the automatic pressure regulator B and the system controller C can be changed as appropriate. For example, the first pressure adjustment damper 14 may be used as the pressure adjustment damper. The supply / exhaust operation unit 23 and the information selection instructing means 28 may be omitted. The means for stopping the exhaust of a part of the air-conditioned spaces 1a, 1b, 1c can be modified appropriately in the specific configuration, for example, by making the system controller C operable.

[Brief description of the drawings] FIG. 1 is a conceptual diagram of the apparatus. FIG. 2 is a block diagram of a control system. [Explanation of symbols] 1a, 1b, 1c Air-conditioned space 3 blower 4 Air supply path 5 exhaust fan 6 exhaust path 4a, 4b, 4c Air supply branch 6a, 6b, 6c Exhaust passage branch 8 Flow control damper 14 Damper for pressure adjustment 10, 12 Air volume control means 18, 19 Exhaust air volume control means A Automatic flow controller B Automatic pressure regulator 11, 17 Opening degree setting device

Claims (1)

(57) [Claims] A plurality of air-conditioned spaces (1a), (1b), (1c)
Are connected in parallel to a blower (3) via an air supply path (4), and are connected in parallel to an exhaust fan (5) via an exhaust path (6). Target space (1a),
(1b), branch portions (4a) separately connected to (1c),
(4b) and (4c) are each provided with a flow control damper (8), and by adjusting the opening of the flow control damper (8), the air conditioning target spaces (1a), (1b),
(1c) an automatic flow controller (A) for maintaining an air supply amount for each of the set ranges is provided, and the air-conditioned space (1a),
(1b), branch portions (6a) separately connected to (1c),
(6b) and (6c) each a pressure adjusting damper (14)
And these pressure adjusting dampers (14)
Of the air-conditioned space (1a), (1
b) An air conditioner for controlling the internal pressure of a space provided with an automatic pressure regulator (B) for maintaining the internal pressure of each of (1c) within a set range , based on a detection opening of the damper (8) for flow rate adjustment. Said
Flow control with the largest opening of the flow control dampers (8)
Keep the opening of the node damper within the set opening range on the air supply side.
As described above, the blowing amount control for adjusting the blowing amount of the blower (3)
Means (10) and (12) are provided, and based on the detected opening of the pressure adjusting damper (14).
And exhaust the opening of all the pressure adjusting dampers (14).
Side of the exhaust fan so as to maintain the set intermediate opening range
(5) exhaust air volume control means (18) for adjusting the exhaust air volume,
An air conditioner for controlling the internal pressure of space provided with (19) . 2. The set opening range on the supply side and the setting on the exhaust side
The opening setting devices (11) and (1) for setting the constant intermediate opening range
The air conditioner for controlling the internal pressure of space according to claim 1, wherein 7) is provided .