JP2020003130A - Differential pressure adjusting device - Google Patents

Abstract

To successfully detect differential pressure.SOLUTION: A differential pressure adjusting device 10 is provided that comprises: a duct 20 disposed in a manner of communicating the inside of a store 1 with the outside of a store 2; a reference pressure loss part 21 provided inside the duct 20 and giving optional differential pressure; and a differential pressure detection part 30 detecting the differential pressure between the inside 1 side and outside 2 side of the reference pressure loss part 21 and that adjusts the differential pressure between the inside of store 1 and the outside of store 2. The differential pressure adjusting device 10 further comprises low pressure loss parts 22 and 23 at least one of which is provided at a position inside the duct 20 and on the outside 2 side of the store from the reference pressure loss part 21 and which give a smaller differential pressure than the reference pressure loss part 21. The reference pressure loss part 21 is constituted of one reference orifice 21a, it is preferable that the low pressure loss parts 22 and 23 include one orifices 22a and 23a whose diameter is larger than that of the reference orifice 21a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential pressure adjusting device, and more particularly to an improvement of a differential pressure adjusting device that adjusts a differential pressure between the inside and the outside of a room such as a store.

  BACKGROUND ART Conventionally, a differential pressure adjusting device that adjusts a differential pressure between the inside and the outside of a room such as a store has been proposed in Patent Document 1. In Patent Literature 1, a duct is provided so as to communicate between the inside and the outside of the store, and a differential pressure detecting unit provided in the duct detects a differential pressure between the inside and the outside of the store. .

JP 2001-153441 A

  By the way, in the above-described differential pressure adjusting device, a duct is provided so as to communicate between the inside and the outside of the store, and a differential pressure detecting unit provided in the duct detects a differential pressure between the inside and the outside of the store. Therefore, there were the following problems. That is, when there is a strong wind or the like outside the store, the strong wind or the like may cause disturbance and adversely affect the detection by the differential pressure detection unit.

  The present invention has been made in view of the above circumstances, and has as its object to provide a differential pressure adjusting device capable of detecting a differential pressure favorably.

  In order to achieve the above object, a differential pressure regulating apparatus according to the present invention is provided with a duct arranged in a mode that communicates the inside and the outside of a target chamber, and an arbitrary differential pressure provided inside the duct. A reference pressure loss unit for applying pressure, and a differential pressure detection unit for detecting a differential pressure between the indoor side and the outdoor side of the reference pressure loss unit, for adjusting a differential pressure between the inside and the outside of the chamber. A differential pressure adjusting device, wherein at least one pressure difference is provided inside the duct at a location outside the reference pressure loss section and outside the reference pressure loss section, and a low pressure loss section provided with a smaller differential pressure than the reference pressure loss section. It is characterized by having.

  Further, according to the present invention, in the differential pressure adjusting device, the reference pressure loss portion is formed by one first orifice, and the low pressure loss portion is formed by one second orifice having a diameter larger than that of the first orifice. It is characterized by comprising.

  Also, the present invention is characterized in that in the above differential pressure adjusting device, the differential pressure detecting section detects a differential pressure by a vertical component orthogonal to a flow direction of air inside the duct.

  Further, in the present invention, in the above differential pressure adjusting device, the air supply means for supplying air from the outside of the chamber to the inside, and the supply pressure may be such that a detection result by the differential pressure detection unit is close to a predetermined pressure difference. And a control unit for driving the air means.

  Further, according to the present invention, in the differential pressure adjusting device, when the temperature outside the chamber is within a predetermined temperature range, the control unit controls the air supply unit regardless of a detection result of the differential pressure detection unit. Driving is stopped.

  Further, according to the present invention, in the differential pressure adjusting device, when the control unit determines that the current date and time is in the night of a predetermined month and day, the pressure inside the room is higher than the pressure outside the room. The air supply means is driven in a mode in which the air supply means also becomes large.

  According to the present invention, since at least one low pressure loss portion having a smaller differential pressure than the reference pressure loss portion is provided at a location inside the duct and outside the reference pressure loss portion, the difference in pressure is provided. In the area where differential pressure is detected by the pressure detector, the low pressure loss section can detect the differential pressure of air with sufficient pressure loss, and can detect the environment outside the room (strong wind, etc.) and the shape of the duct This has the effect that the differential pressure can be detected satisfactorily without being affected by the above.

FIG. 1 is a schematic diagram schematically showing a differential pressure adjusting device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a characteristic control system of the differential pressure adjusting device according to the embodiment of the present invention. FIG. 3 is an enlarged view showing a main part of the duct shown in FIG. 1 in an enlarged manner. FIG. 4 is a flowchart showing the contents of processing performed by the control unit shown in FIG. FIG. 5 is a flowchart showing the processing content of the differential pressure adjustment processing shown in FIG. FIG. 6 is a flowchart illustrating the processing content of an operation determination process performed by the control unit illustrated in FIG. 2. FIG. 7 is a flowchart illustrating the processing content of the insect control operation processing illustrated in FIG. 6. FIG. 8 is a flowchart showing the processing content of the normal operation processing shown in FIG.

  Hereinafter, preferred embodiments of a differential pressure adjusting device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram schematically showing a differential pressure adjusting device according to an embodiment of the present invention, and FIG. 2 shows a characteristic control system of the differential pressure adjusting device according to the embodiment of the present invention. It is a block diagram.

  The differential pressure adjusting device 10 illustrated here adjusts a differential pressure between the inside of a store (hereinafter, also referred to as inside the store) 1 and the outside of the store (hereinafter, also referred to as outside of the store) 2, and includes a duct 20, a reference pressure loss unit. 21, a differential pressure detecting section 30, an air supply fan 40, an outside air temperature sensor 50, and a control section 60.

  The duct 20 is installed so as to connect the inside 1 of the store and the outside 2 of the store. This duct 20 has an opening 20a at one end facing the inside of the store 1 and an opening 20b at the other end facing the outside 2 of the store. The duct 20 allows air to flow along its own axial direction.

  The reference pressure loss part 21 is a flat plate-like member provided inside the duct 20 and provided so as to close the inside of the duct 20. The reference pressure loss section 21 has one reference orifice (first orifice) 21a. The reference pressure loss unit 21 applies an arbitrary pressure difference (pressure difference) between the inside 1 and outside 2 of the store based on itself.

  The differential pressure detecting unit 30 detects a differential pressure between the inside 1 and outside 2 of the reference pressure loss unit 21. As shown in FIG. 3, the differential pressure detecting unit 30 includes a first inlet 221 formed on a side surface of the duct 20 closer to the inside of the store than the reference pressure loss unit 21, and a store more than the reference pressure loss unit 21. It is provided in communication with a second introduction port 222 formed on the side surface of the duct 20 on the outside 2 side.

  That is, the differential pressure detecting unit 30 detects a pressure difference between the air introduced from the first inlet 221 and the air introduced from the second inlet 222. The first inlet 221 and the second inlet 222 are formed on the side surface of the duct 20, and the air inside the duct 20 flows along the axial direction of the duct 20. Is for detecting a differential pressure with a vertical component orthogonal to the flow direction of the air inside the duct 20. The differential pressure detecting section 30 supplies a differential pressure detection value as a detection result to the control section 60 as a differential pressure signal.

  Incidentally, a first low pressure loss portion 22 and a second low pressure loss portion 23 are provided inside the duct 20 on the outside 2 side of the store with respect to the reference pressure loss portion 21.

  The first low pressure loss portion 22 is a flat member that is disposed inside the duct 20 and closer to the outside of the store than the second inlet 222, and is provided so as to close the inside of the duct 20. The first low pressure loss portion 22 has one first low pressure orifice (second orifice) 22a.

  The second low pressure loss part 23 is a flat member provided inside the duct 20 and closer to the outside 2 than the first low pressure loss part 22 and provided so as to close the inside of the duct 20. is there. One second low-pressure orifice (second orifice) 23a is formed in the second low-pressure loss portion 23.

  Here, the first low-pressure orifice 22a and the second low-pressure orifice 23a have the same inner diameter d2, and the ratio of the inner diameter d1 of the reference orifice 21a to the inner diameter d1 is 1.3 to 3.0.

  That is, the inner diameter d2 of the first low pressure orifice 22a and the second low pressure orifice 23a is larger than the inner diameter d1 of the reference orifice 21a, so that the first low pressure loss part 22 and the second low pressure loss part 23 The differential pressure applied is smaller than that of the loss part 21.

  The air supply fan 40 is an air supply unit that rotates when the motor 41 as a drive source is driven in accordance with a command given from the control unit 60 and supplies air outside the store 2 to the store 1. The outside air temperature sensor 50 is a temperature detecting unit that detects the temperature outside the store 2. The outside air temperature sensor 50 provides the outside air temperature as a detection result to the control unit 60 as a temperature signal.

  The control unit 60 controls the operation of the differential pressure adjusting device 10 in accordance with programs and data stored in the storage unit 70, and includes a setting processing unit 61, an input processing unit 62, a comparison processing unit 63, an output processing Unit 64 and an operation determination processing unit 65. The control unit 60 may be realized, for example, by causing a processing device such as a CPU (Central Processing Unit) to execute a program, that is, by a software, or by a hardware such as an IC (Integrated Circuit). Alternatively, it may be realized by using software and hardware together.

  For example, when a setting is input through an input unit 80 such as a dedicated terminal such as a remote controller or a portable information terminal such as a smartphone or a tablet, the setting processing unit 61 performs various settings and stores the setting contents in a storage unit 70. Is stored. As a result, the storage unit 70 stores in the storage unit 70 a differential pressure target value serving as a threshold value in processing to be described later and drive stop temperature information (for example, information including a drive stop temperature range in which the lower limit is 15 ° C. and the upper limit is 25 ° C.). ) Is stored.

  The input processing unit 62 inputs a differential pressure detection value given as a differential pressure signal from the differential pressure detection unit 30 and an outside air temperature given as a temperature signal from the outside air temperature sensor 50. The comparison processing unit 63 compares the outside air temperature input through the input processing unit 62 with the lower limit value and the upper limit value of the drive stop temperature range in a process described later, or compares the detected outside pressure with the differential pressure detection value input through the input processing unit 62. And a differential pressure target value.

  The output processing unit 64 gives a drive stop command, a rotation speed increase command, a rotation speed reduction command, and the like to the motor 41 that is a driving source of the air supply fan 40. The operation determination processing unit 65 determines whether or not a current date and time of an operation determination process described later is in the night of a predetermined month and day, and makes an operation determination.

  FIG. 4 is a flowchart showing the processing performed by the control unit 60 shown in FIG. The operation of the differential pressure adjusting device 10 will be described while describing the contents of the processing.

  The control unit 60 determines whether or not the outside air temperature (T) has been input through the input processing unit 62 (Step S101). When it is determined that the outside air temperature (T) has been input (step S101: Yes), the control unit 60 reads out the drive stop temperature information from the storage unit 70 through the comparison processing unit 63 (step S102). On the other hand, when it is determined that the outside air temperature (T) has not been input (step S101: No), the control unit 60 repeats the processing of step S101 described above.

  The control unit 60 that has read the drive stop temperature information determines whether the outside air temperature (T) is equal to or higher than the lower limit value (15 ° C.) of the drive stop temperature range and drives the outside air temperature (T) through the comparison processing unit 63. It is determined whether the temperature is equal to or lower than the upper limit value (25 ° C.) of the stop temperature range (steps S103 and S104). That is, the control unit 60 compares whether or not the outside air temperature (T) is within the drive stop temperature range (15 ° C. or more and 25 ° C. or less).

  When the outside air temperature (T) is equal to or higher than the lower limit (15 ° C.) and equal to or lower than the upper limit (25 ° C.) of the drive stop temperature range (Step S103: Yes, Step S104: Yes), the control unit 60 sets the output processing unit 64. Then, a drive stop command is given to the air supply fan 40 to stop the drive (step S105), and then the current process is terminated.

  On the other hand, when the outside air temperature (T) is lower than the lower limit (15 ° C.) or higher than the upper limit (25 ° C.) of the drive stop temperature range (Step S103: No, Step S104: No), the control unit 60 sets the differential pressure Perform the adjustment process.

  FIG. 5 is a flowchart showing the processing content of the differential pressure adjustment processing shown in FIG. In the differential pressure adjusting process, the control unit 60 determines whether a differential pressure signal has been input through the input processing unit 62 (Step S111). When determining that the differential pressure signal has been input (Step S111: Yes), the control unit 60 reads the differential pressure target value from the storage unit 70 through the comparison processing unit 63 (Step S112). On the other hand, when it is determined that the differential pressure signal has not been input (step S111: No), the control unit 60 repeats the process of step S111 described above.

  The control unit 60 that has read out the differential pressure target value compares, via the comparison processing unit 63, whether or not the differential pressure detection value included in the differential pressure signal is equal to or less than the differential pressure target value (step S113). When the detected differential pressure value is equal to or less than the target differential pressure value (Step S113: Yes), the control unit 60 sends a rotation speed increase command to the motor 41 through the output processing unit 64 to increase the rotation speed of the air supply fan 40. (Step S114), and thereafter, the procedure is returned to end the current processing. According to this, the amount of air supply from the outside 2 to the inside 1 increases, and the pressure in the inside 1 increases.

  On the other hand, if the detected differential pressure value is not equal to or less than the target differential pressure value (step S113: No), the control unit 60 sends a rotation speed reduction command to the motor 41 through the output processing unit 64 to send the rotation speed of the air supply fan 40. Is reduced (step S115), and thereafter, the procedure is returned to end the current processing. According to this, the amount of air supply from the outside 2 to the inside 1 decreases, and the pressure in the inside 1 shifts to a decreasing direction. The control unit 60 that has performed such a differential pressure adjustment process ends the current process thereafter.

  The control unit 60 described above may perform the following operation determination processing instead of the processing illustrated in FIGS. 4 and 5.

  FIG. 6 is a flowchart showing the processing content of the operation determination processing performed by the control unit 60 shown in FIG. The operation of the differential pressure adjusting device 10 will be described while describing the contents of the processing.

  In the driving determination process, the control unit 60 determines whether the current date and time falls on June 1 to September 30 and determines whether the current date and time is nighttime (19:00 to 7:00) through the driving determination processing unit 65. It is determined whether this is the case (steps S210, S220).

  When the current date and time is from June 1 to September 30 and corresponds to the nighttime (19:00 to 7:00) (Step S210: Yes, Step S220: Yes), the control unit 60 performs the insect repellent driving process. (Step S230).

  FIG. 7 is a flowchart illustrating the processing content of the insect control operation processing illustrated in FIG. 6. Note that the insect-preventing operation process has the same processing content as the above-described differential pressure adjustment process, and the target differential pressure value is specified as, for example, 5 Pa.

  In this insect control operation, the control unit 60 determines whether or not a differential pressure signal has been input through the input processing unit 62 (step S231). When it is determined that the differential pressure signal has been input (Step S231: Yes), the control unit 60 reads the differential pressure target value (5 Pa) from the storage unit 70 through the comparison processing unit 63 (Step S232). On the other hand, when it is determined that the differential pressure signal has not been input (step S231: No), the control unit 60 repeats the process of step S231 described above.

  The control unit 60 that has read out the differential pressure target value compares, via the comparison processing unit 63, whether or not the differential pressure detection value included in the differential pressure signal is 5 Pa or less (step S233). If the detected differential pressure value is 5 Pa or less (step S233: Yes), the control unit 60 sends a rotation speed increase command to the motor 41 through the output processing unit 64 to increase the rotation speed of the air supply fan 40 (step S233). (S234) Then, the procedure is returned to end the current processing. According to this, the amount of air supply from the outside 2 to the inside 1 increases, and the pressure in the inside 1 increases.

  On the other hand, when the differential pressure detection value is not equal to or less than 5 Pa (Step S233: No), the control unit 60 sends a rotation speed reduction command to the motor 41 through the output processing unit 64 to reduce the rotation speed of the air supply fan 40. (Step S235) Then, the procedure is returned to end the current process. According to this, the amount of air supply from the outside 2 to the inside 1 decreases, and the pressure in the inside 1 shifts to a decreasing direction. The control unit 60 that has performed such an insect repellent operation process thereafter ends the current operation determination process.

  By the way, if the current date and time is not from June 1 to September 30 (Step S210: No) or if it does not correspond to nighttime (19:00 to 7:00) (Step S220: No), the control unit 60 A normal operation process is performed (Step S240).

  FIG. 8 is a flowchart showing the processing content of the normal operation processing shown in FIG. Note that the normal operation processing has the same processing content as the above-described differential pressure adjustment processing, and the target differential pressure value is specified as, for example, 0 Pa.

  In the normal operation process, the control unit 60 determines whether a differential pressure signal has been input through the input processing unit 62 (step S241). When determining that the differential pressure signal has been input (step S241: Yes), the control unit 60 reads the differential pressure target value (0 Pa) from the storage unit 70 through the comparison processing unit 63 (step S242). On the other hand, when it is determined that the differential pressure signal has not been input (step S241: No), the control unit 60 repeats the process of step S241 described above.

  The control unit 60 that has read the differential pressure target value compares, via the comparison processing unit 63, whether or not the differential pressure detection value included in the differential pressure signal is equal to or less than 0 Pa (step S243). If the detected differential pressure value is equal to or less than 0 Pa (Step S243: Yes), the control unit 60 sends a rotation speed increase command to the motor 41 through the output processing unit 64 to increase the rotation speed of the air supply fan 40 (Step S243). S244) Then, the procedure is returned to end the current processing. According to this, the amount of air supply from the outside 2 to the inside 1 increases, and the pressure in the inside 1 increases.

  On the other hand, if the differential pressure detection value is not equal to or less than 0 Pa (Step S243: No), the control unit 60 sends a rotation speed reduction command to the motor 41 through the output processing unit 64 to reduce the rotation speed of the air supply fan 40. (Step S245) Then, the procedure is returned to end the current processing. According to this, the amount of air supply from the outside 2 to the inside 1 decreases, and the pressure in the inside 1 shifts to a decreasing direction. The control unit 60 that has performed the normal operation processing thereafter ends the current operation determination processing.

  As described above, according to the differential pressure adjusting apparatus 10 according to the embodiment of the present invention, the first low pressure loss section 22 and the second low pressure loss section 23 that provide a smaller differential pressure than the reference pressure loss section 21. Is provided inside the duct 20 and on the side outside the store 2 from the reference pressure loss section 21, so that in the area where the differential pressure detection section 30 detects the differential pressure, the first low pressure loss section 22 and the second low pressure loss unit 23 can detect the differential pressure of the air in a state where the pressure is sufficiently reduced in a stepwise manner. Without receiving it, the differential pressure can be detected satisfactorily.

  According to the differential pressure adjusting device 10, since the differential pressure detecting unit 30 detects the differential pressure with the vertical component orthogonal to the flow direction of the air inside the duct 20, it is affected by the flow direction component of the air. Absent. Therefore, the differential pressure between the static pressure on the inside 1 side of the store and the static pressure on the outside 2 side of the reference pressure loss portion 21 can be detected satisfactorily.

  Further, according to the differential pressure adjusting device 10, when the outside air temperature is within the drive stop temperature range (15 ° C. or more and 25 ° C. or less), the control unit 60 stops driving the air supply fan 40. However, for example, when the load of the air conditioner that manages the temperature in the store 1 is at a low temperature, the driving of the air supply fan 40 is stopped to reduce power consumption and save energy.

  Furthermore, according to the differential pressure adjusting device 10, when the current date and time is from June 1 to September 30 and corresponds to nighttime (19:00 to 7:00), the insect repellent driving process is performed. Then, since the air supply fan 40 is driven so that the differential pressure detection value becomes 5 Pa, the invasion of insects and the like into the store 1 can be restricted.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the above-described embodiment, the first low pressure loss section 22 and the second low pressure loss section 23 are provided on the outside 2 side of the reference pressure loss section 21. However, in the present invention, the chamber of the reference pressure loss section is provided. It suffices if at least one low pressure loss portion is provided on the outside.

  In the above-described embodiment, the reference pressure loss portion 21 is formed by forming one reference orifice 21a, and the first low pressure loss portion 22 and the second low pressure loss portion 23 are each provided with one first low pressure orifice. Although the second low-pressure orifice 22a and the second low-pressure orifice 23a are formed, in the present invention, the reference pressure loss portion and the low pressure loss portion only need to be able to apply a differential pressure, and thus are formed by forming a plurality of orifices. Or a mesh material or the like.

  In the above-described embodiment, the drive of the air supply fan 40 is stopped when the outside air temperature is in the drive stop temperature range. However, in the present invention, even when the outside air temperature is in the drive stop temperature range, the supply of air is stopped. The air fan may be driven.

DESCRIPTION OF SYMBOLS 1 Inside a shop 2 Outside a shop 10 Differential pressure adjusting device 20 Duct 21 Reference pressure loss part 21a Reference orifice 22 First low pressure loss part 22a First low pressure orifice 23 Second low pressure loss part 23a Second low pressure orifice 30 Differential pressure detection part Reference Signs List 40 air supply fan 50 outside air temperature sensor 60 control unit 61 setting processing unit 62 input processing unit 63 comparison processing unit 64 output processing unit 65 operation determination processing unit 70 storage unit

Claims (6)

A duct arranged in a manner to communicate between the inside and the outside of the target room,
A reference pressure loss unit provided inside the duct and providing an arbitrary pressure difference,
A differential pressure detecting unit that detects a differential pressure between the indoor side and the outdoor side of the reference pressure loss unit,
A differential pressure adjusting device for adjusting a differential pressure between the inside and the outside of the chamber,
At least one low pressure loss portion is provided inside the duct at a location outside the reference pressure loss portion on the outside of the reference pressure loss portion and has a smaller differential pressure than the reference pressure loss portion. Differential pressure regulator. The reference pressure loss section is constituted by one first orifice,
2. The differential pressure adjusting device according to claim 1, wherein the low pressure loss portion includes one second orifice having a diameter larger than that of the first orifice. 3.   The differential pressure adjusting device according to claim 1, wherein the differential pressure detecting unit detects a differential pressure using a vertical component orthogonal to a flow direction of air inside the duct. Air supply means for supplying air from the outside of the chamber to the inside,
The control part which drives the said air supply means in the aspect which the detection result by the said differential pressure detection part approaches the preset pressure difference, The control part was provided, The any one of Claims 1-3 characterized by the above-mentioned. Differential pressure adjusting device.   5. The control unit, when the temperature outside the chamber is within a predetermined temperature range, stops driving the air supply unit regardless of a detection result of the differential pressure detection unit. 6. 4. The differential pressure adjusting device according to 1.   When the control unit determines that the current date and time is during the night of a predetermined month and day, the control unit drives the air supply unit in such a manner that the pressure inside the chamber becomes higher than the pressure outside the chamber. The pressure difference adjusting device according to claim 4, wherein:

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