CN111910744B - Drain pipe clogging monitoring device and drain pipe clogging monitoring system - Google Patents
Drain pipe clogging monitoring device and drain pipe clogging monitoring system Download PDFInfo
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- CN111910744B CN111910744B CN202010363380.0A CN202010363380A CN111910744B CN 111910744 B CN111910744 B CN 111910744B CN 202010363380 A CN202010363380 A CN 202010363380A CN 111910744 B CN111910744 B CN 111910744B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
A drain clogging monitoring device and a drain clogging monitoring system. The clogging of the cross pipe can be easily monitored even without visual observation. A drain pipe clogging monitoring device (7) is provided with: a tubular main body frame (71) which is mounted near the drain inflow side of the drain lateral pipe; a rubber pad (72) attached to the entire outer periphery of the main body frame (71); a main body (73) disposed at the center; a drainage through hole (75) which is provided below the main body section (73) and which allows the amount of drainage flowing into the drainage lateral branch pipe to be constant; and an air through-hole (74) provided above the main body (73). Water detection sensors (76 a, 76 b) are arranged in a vertical direction on the side surface of the main body (73) on the drain outlet side, and the water level of drain flowing backward from the drain outlet side is detected.
Description
Technical Field
The present invention relates to a drain blockage monitoring device and a drain blockage monitoring system, and more particularly to monitoring blockage of a cross pipe.
Background
For example, drainage from a restaurant in a building such as a shopping mall is sent from a drainage pipe in the store to a vertical pipe (main pipe) of the shopping mall through a drainage funnel and a drainage lateral pipe, and then discharged to the outside.
However, in a restaurant using a large amount of grease, the possibility of the drain pipe being clogged becomes relatively high. In addition, when the clogging is serious, the drain water flowing from the drain bucket into the drain lateral pipe may flow backward without being discharged from the vertical pipe, and the inside of the store may be flooded. In order to eliminate such a situation, it is necessary to perform cleaning before the clogging degree of the drain pipe becomes serious.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open publication No. 2011-128791
Patent document 2: japanese patent laid-open No. 2003-56034
Patent document 3: japanese laid-open patent publication No. 2-223887
Patent document 4: japanese patent laid-open publication No. 2018-53616
Patent document 5: japanese laid-open patent publication No. 10-159169
Patent document 6: international publication No. 2012/014632
However, since the drain pipe is buried in the floor of a building or the like, it is not possible to easily check the clogging of the drain pipe. Although it is conceivable to perform cleaning periodically, since the clogging situation varies depending on the store, if the clogging situation is not so large, the cleaning operation becomes useless. In addition, waste may be generated in cost. On the contrary, if the interval for performing the cleaning operation is excessively spaced, the drain water may flow backward as described above.
Disclosure of Invention
The invention aims to easily monitor the blockage of a transverse pipe without visual inspection.
The drain pipe clogging monitoring device of the present invention is characterized by comprising: a tubular frame portion fixed to an inner surface of a horizontal pipe in the vicinity of a drain inflow side of the horizontal pipe; a water level detection unit that detects a water level of drain water flowing from a drain outflow side of the horizontal pipe to a position of the frame portion; and a transmitting unit that transmits data related to the water level detected by the water level detecting unit to a central monitoring apparatus. The water level detection unit includes a plurality of water detection sensors that detect water discharge and detect a water level of the water discharge flowing backward, and the plurality of water detection sensors are arranged in a vertical direction on a drain outflow side of the horizontal pipe of the frame portion.
Further, a drain clogging monitoring device according to the present invention includes: a main body portion that divides an inside of the frame portion into upper and lower portions along a longitudinal direction of the frame portion; a drain through hole corresponding to a lower side in the frame portion divided by the body portion; and an air through hole corresponding to an upper side in the frame portion divided by the body portion.
In addition, the drain blockage monitoring device according to the present invention includes a wind pressure measuring unit attached to the air through hole, and the transmitting unit transmits data relating to the wind pressure measured by the wind pressure measuring unit to the central monitoring device.
In the drain pipe clogging monitoring device according to the present invention, a plurality of concave portions are provided on a side surface of the main body portion on a drain outflow side of the horizontal pipe, and the water detection sensors are attached to the plurality of concave portions respectively facing the drain outflow side of the horizontal pipe.
The drain blockage monitoring system of the invention is characterized by comprising: the drain pipe clogging monitoring device described above; and a central monitoring device having: a receiving unit that receives data transmitted from the drain pipe clogging monitoring device; and a presentation unit that presents the data received by the reception unit and clogging condition information indicating a clogging condition of a horizontal pipe to which the drain clogging monitoring device is attached.
In addition, the drain pipe clogging monitoring system according to the present invention is characterized by comprising a notification means for notifying information to be dealt with clogging of the lateral pipe which can be predicted from the clogging condition information.
Effects of the invention
According to the present invention, the clogging of the horizontal tube can be easily monitored without visual observation.
Drawings
Fig. 1 is a conceptual diagram illustrating a main part of a drain piping system installed in a building according to the present embodiment.
Fig. 2 is a perspective view of the drain blockage monitoring device according to the present embodiment.
Fig. 3 is a block diagram showing the configuration of the drain clogging monitoring system according to the present embodiment.
Fig. 4 is a diagram showing an example of display of data received from the drain blockage monitoring device in the present embodiment.
Description of the reference symbols
1: a drainage facility; 2: a miscellaneous water drainage pipe; 3: a drain (water collection) hopper; 4: an elbow for a drainage elbow; 5: a horizontal drainage branch pipe; 6: a riser; 7: a drain pipe clogging monitoring device; 10: a central monitoring device; 11: a receiving section; 12: an analysis processing unit; 13: a presentation unit; 14: a notification unit; 15: a data storage unit; 16: a device main information storage unit; 71: a main body frame; 72: a rubber pad; 73: a main body portion; 74: an air through opening; 75: a drainage through hole; 76. 76a, 76b: a water detection sensor; 77. 77a, 77b: a recess; 78: a wind pressure sensor; 79: a communicator; 791: a collecting section; 792: a data processing unit; 793: a transmission unit.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a conceptual diagram illustrating a main part of a drain piping apparatus installed in a building such as a shopping mall and used for discharging the drain from a drain apparatus 1 of a restaurant in the shopping mall to the outside. Fig. 1 shows a drain piping system including a miscellaneous drain pipe 2, a drain bucket (water collecting bucket) 3, a drain elbow 4, a drain lateral pipe 5, and a stand pipe 6. It is assumed that the drain water discharged from the drain apparatus 1 is a sink at a kitchen or a drain water discharged from a drain port of the floor. The drainage may contain oils and fats, food residues, powder, and the like (hereinafter collectively referred to as "oils and fats") which cause clogging of the drainage pipe.
As shown by arrows in fig. 1, the drain water discharged from the drain apparatus 1 is accumulated in the drain funnel 3 through the miscellaneous drain pipe 2, and is discharged to the outside through the drain elbow 4, the drain lateral pipe 5, and the stand pipe 6. Further, when the water level of the drain water in the drain bucket 3 exceeds the lower surface of the lateral drain pipe 5, the drain water accumulated in the drain bucket 3 automatically flows out to the lateral drain pipe 5.
The drain pipe clogging monitoring device 7 in the present embodiment is installed near the inlet side of the lateral drain branch pipe 5 (inflow side of the drain from the drain bucket 3) to monitor clogging of the lateral drain branch pipe 5. The drain cross leg 5 is one form of a cross tube. Since the drain elbow 4 is detachably connected to the lateral drain pipe 5, the drain pipe clogging monitoring device 7 can be easily attached to the lateral drain pipe 5 by detaching the drain elbow 4. Further, the drain pipe clogging monitoring device 7 can be detached from the lateral drain pipe 5 and cleaned.
Fig. 2 is a perspective view of the drain blockage monitoring device 7 in the present embodiment. The drain pipe clogging monitoring device 7 is formed in a tubular shape in accordance with the inner diameter shape of the horizontal drain pipe 5, and a rubber gasket 72 is attached to the entire outer periphery of a main body frame 71 forming the tubular shape. The frame of the drain blockage monitoring device 7 is formed by the main body frame 71 and the rubber pad 72, and the entire outer periphery of the rubber pad 72 abuts against the inner surface of the lateral drain pipe 5, whereby the drain flowing from the drain bucket 3 into the lateral drain pipe 5 passes through the drain blockage monitoring device 7. The drain pipe clogging monitoring device 7 may be detachably fixed to the horizontal drain pipe 5 by screwing or the like. Alternatively, the fixing may be performed by welding so as not to be detachable.
A main body 73 is provided in a central portion of the main body frame 71 along a longitudinal direction of the drain pipe clogging monitoring device 7 (a flow direction of drain water indicated by an arrow a in fig. 2). The body 73 is in contact with the left and right inner surfaces of the body frame 71, and thus divides the inside of the body frame 71 into two upper and lower portions. The opening corresponding to the upper side formed by the vertical division is an air through-hole 74 through which air flows. The opening corresponding to the lower side formed by the vertical division is a drain through hole 75 through which drain flows.
As illustrated in fig. 2, the body portion 73 is formed to have a certain width (thickness) in the vertical direction. On the side surface of the drain outflow side (the outlet side of the drain lateral pipe 5) formed by the width, a plurality of water detection sensors are provided in a vertical direction as water level detection means for detecting the water level of drain flowing backward from the drain outflow side, and in the case of the present embodiment, two water detection sensors 76a and 76b are provided in a vertical direction. The water detection sensors 76a and 76b are attached to recesses 77a and 77b provided in the side surface of the main body 73, respectively. In the following description, when it is not necessary to distinguish the water detection sensors 76a and 76b from each other, they are collectively referred to as "water detection sensor 76". The same applies to the recess 77. Since the water detection sensor 76 detects drain water flowing backward, the water detection sensor 76 is provided in the recess 77 so as not to detect drain water that does not flow backward, that is, drain water flowing in the direction of arrow a.
When the lateral drain pipe 5 is clogged, the drain water that should have flowed out to the stand pipe 6 through the drain pipe clogging monitoring device 7 flows backward, and when the water detection sensor 76b detects the drain water flowing backward, it is known that the water level in the lateral drain pipe 5 has reached the mounting position of the water detection sensor 76b. Similarly, when the water detection sensor 76a detects drain water flowing backward, it is known that the water level in the drain lateral pipe 5 has reached the mounting position of the water detection sensor 76 a. In the present embodiment, by arranging the plurality of water detection sensors 76 in the vertical direction in this manner, the water level in the lateral drain pipe 5 can be detected. In the present embodiment, the water level is detected by using a plurality of water detection sensors 76, but the water level detection means may be formed by using other means such as a water level detection sensor.
A wind pressure sensor 78 is provided in the air through hole 74, and the wind pressure sensor 78 measures the wind pressure of the air passing through the air through hole 74.
A communication device 79 is provided as transmission means inside the main body 73, and the communication device 79 transmits data relating to the water level detected by the water detection sensor 76 and data relating to the wind pressure measured by the wind pressure sensor 78 to the central monitoring device.
Fig. 3 is a block diagram showing a drain clogging monitoring system including the communication device 79 and the central monitoring device. The communicator 79 includes a collecting unit 791, a data processing unit 792, and a transmitting unit 793. The collecting unit 791 collects sensor data from the sensors 76 and 78 via a signal line not shown or by wireless communication. The data processing unit 792 converts the collected sensor data into data of a predetermined form with the central monitoring apparatus 10. The transmitting unit 793 transmits the data converted by the data processing unit 792 to the central monitoring apparatus 10 by wire or wireless.
The communication device 79 is equipped with a computer having a CPU, ROM, RAM, memory, and a network interface. Although not shown, the communication device 79 includes a power supply unit such as a battery for operating the computer.
The central monitoring device 10 is a device that monitors the clogging of the drain pipes installed in the building in a centralized manner, and can be realized by a server computer including a storage unit such as a CPU, a ROM, a RAM, and a Hard Disk Drive (HDD), a network interface, and a user interface (a display as a display unit, and a mouse and a keyboard as an input unit). The central monitoring device 10 includes a receiving unit 11, an analysis processing unit 12, a presentation unit 13, a notification unit 14, a data storage unit 15, and a device main information storage unit 16. In the drawings, components not used in the description of the present embodiment are omitted.
The receiving unit 11 receives the data transmitted from the drain clogging monitoring device 7 and stores the data in the data storage unit 15. The analysis processing unit 12 analyzes the data stored in the data storage unit 15 to generate clogging condition information indicating clogging of the lateral drain pipe 5 to which the drain pipe clogging monitoring device 7 is attached. The presentation unit 13 presents the traffic jam condition information generated by the analysis processing unit 12 to a user such as a monitor by displaying the information on a display connected to the central monitoring apparatus 10. The notification unit 14 notifies the worker who performs the maintenance work of the drainage pipe or the like of the information about the treatment of the lateral drainage branch pipe 5 based on the situation of the clogging of the lateral drainage branch pipe 5 which can be predicted based on the clogging situation information generated by the analysis processing unit 12.
The device main information storage unit 16 is set and registered with main information relating to the drain clogging monitoring device 7. The master information includes sensor information depending on the sensor type, such as identification information of the drain blockage monitoring device 7, position information for specifying the installation position of the drain blockage monitoring device 7, the type of the sensor included in the drain blockage monitoring device 7, and the installation position of each sensor. In the position information, since the position of the store can be specified based on the contract information and the like, the identification information of the store using the drain lateral pipe 5 to which the drain clogging monitor 7 is attached may be set. Alternatively, when the arrangement position of the lateral drain pipe 5 cannot be determined based on design information of the building or the like, identification information of the lateral drain pipe 5 to which the drain clogging monitoring device 7 is attached may be set. In addition, information for specifying floors, areas, and the like in the building may be set. In the sensor information, for example, in the case of the water detection sensor 76, the mounting position (height) of the lateral drain pipe 5 (or the drain pipe clogging monitoring device 7) from the lowest point is set so that the water level can be specified.
Each of the components 11 to 14 in the central monitoring apparatus 10 is realized by the coordinated operation of a computer forming the central monitoring apparatus 10 and a program running on a CPU mounted on the computer. The storage units 15 and 16 are realized by HDDs mounted on the central monitoring device 10. Alternatively, the RAM or an external storage unit may be used via a network.
Note that the program used in the present embodiment may be provided by a communication unit, or may be stored in a computer-readable recording medium such as a CD-ROM or a USB memory. The programs provided by the communication unit and the recording medium are installed in the computer, and the CPU of the computer sequentially executes the programs to realize various processes.
Next, the operation in the present embodiment will be described.
As described above, the drain water discharged from the drain apparatus 1 is discharged to the outside through the miscellaneous drain pipe 2, the drain bucket 3, the elbow for drain 4, the lateral drain pipe 5, and the stand pipe 6. Although the lateral drain pipes 5 are slightly inclined toward the vertical pipe 6, when grease causing clogging of the drain pipe is contained in the drain water, clogging may occur due to accumulation of grease. When the clogging condition becomes serious, the drain water flowing from the drain elbow 4 into the drain lateral pipe 5 and passing through the drain clogging monitoring device 7 is blocked by the clogging and does not smoothly flow into the stand pipe 6, and the drain water is returned in reverse flow depending on the situation. The drain water flowing backward returns to the installation position of the drain clogging monitor 7. Then, the water detection sensor 76b outputs a water detection signal when detecting the drain water flowing backward.
However, when a large amount of drainage flows from the drainpipe 2 into the drain hopper 3 at once, the drainage also flows into the drainage lateral pipe 5 at once. Then, the backflow is likely to occur in the lateral drain pipe 5. On the other hand, when the drainage flows into the drain bucket 3 from the drainpipe 2 a little at a time, the drainage also flows into the lateral drainage branch pipe 5 a little at a time. Thus, even if the lateral drain pipes 5 are clogged, the reverse flow is not easily generated. Thus, the level of the drain water detected by the water detection sensor 76 is affected by the amount of the drain water flowing into the drain lateral pipe 5. In the present embodiment, in particular, the drain through hole 75 is formed so as to be less susceptible to the amount of water discharged into the lateral drain pipe 5, and the amount of water discharged from the drain plug monitor 7 is kept as constant as possible. This makes it easy to compare the time-series water level change when recognizing the clogging of the lateral drain pipe 5.
The collecting unit 791 of the communicator 79 constantly monitors the outputs from the sensors 76, 78. When the sensor data (water detection signal) output from the water detection sensor 76b is collected by the collection unit 791, the data processing unit 792 adds the current time (detection time), the identification information of the drain clogging monitoring device 7, and the identification information of the water detection sensor 76b that has detected the drainage to the collected sensor data, and generates data relating to the water level. Then, the transmission unit 793 transmits data relating to the generated water level to the central monitoring apparatus 10. The same applies to the case where the water detection sensor 76a detects water discharge. In the present embodiment, data is transmitted to the central monitoring apparatus 10 when the water detection sensor 76 detects water drainage, but this may be transmitted to the central monitoring apparatus 10 even when water drainage is not detected.
The collecting unit 791 always collects the wind pressure measured by the wind pressure sensor 78, but the data processing unit 792 adds the current time (detection time), the identification information of the drain blockage monitoring device 7, and the identification information of the wind pressure sensor 78 to the collected sensor data (wind pressure) to generate data relating to the wind pressure. Then, the transmitting unit 793 transmits data related to the generated wind pressure to the central monitoring apparatus 10. The data processing unit 792 may transmit all the collected sensor data, or may transmit the sensor data collected at predetermined time intervals.
When the receiving unit 11 of the central monitoring device 10 receives the data transmitted from the drain clogging monitoring device 7 as described above, it stores the data in the data storage unit 15.
Fig. 4 is a diagram showing an example of display when data received from the drain clogging monitoring device 7 is displayed on a display, for example. The horizontal axis is time. The vertical axis represents sensor data. In fig. 4, different types of sensor data are displayed together. The wind pressure shown by the broken line is the wind pressure measured by the wind pressure sensor 78. In fig. 4, the water detection sensors 76a and 76b are assigned to broken lines, but the solid lines on the broken lines correspond to when the water detection signal is received.
A manager or the like (hereinafter referred to as a "manager") of the drainage piping equipment recognizes the clogging state of the lateral drainage pipe 5 with reference to the sensor data displayed in the form of the graph. For example, while the backflow is detected, the manager identifies the clogging state of the lateral drain pipe 5 by referring to the time length of detection of the drain by the water detection sensors 76a and 76b, the time difference from the detection of the drain by the water detection sensor 76b to the detection of the drain by the water detection sensor 76a, the time difference from the non-detection of the drain by the water detection sensor 76a to the non-detection of the drain by the water detection sensor 76b, and the degree of change in the time length from the detection of the drain by the water detection sensor 76 to the non-detection of the drain.
For example, when the clogging of the lateral drain pipe 5 becomes serious, it takes time for the drain detected by the water detection sensor 76 to drain. That is, since the water level is hard to fall, the time for detecting the drainage becomes long. Further, the interval of the time when the water detection sensor 76 detects the drainage becomes short. Further, when the clogging of the lateral drain pipe 5 becomes serious, the air returns to the drain pipe clogging monitoring device 7, and the wind pressure tends to increase.
The manager refers to the time relationship between the water detection sensors 76a and 76b when the drainage is detected, the time length and the change in the time interval when the water detection sensor 76 detects the drainage, and the like, and thereby grasps the clogging of the lateral drainage pipe 5.
The manager recognizes the clogging of the lateral drain pipe 5 from experience, and the analysis processing unit 12 generates clogging condition information indicating the clogging of the lateral drain pipe 5 based on past results. The clogging condition information includes, for example, results of predicting a change in the clogging condition of the lateral drain pipe 5 and predicting the occurrence timing of flooding in the store. Then, the notification unit 14 generates response information for responding to the clogging of the lateral drain pipe 5 that can be predicted from the clogging state information, and notifies the operator or the like of the response information. The response information may include, for example, the following cleaning plan: the horizontal drainage branch pipes 5 identified from the clogging condition information as having a tendency to deteriorate in clogging condition need to be cleaned in the near future although the priority is not high; the lateral drain pipes 5 identified as being clogged are cleaned as soon as possible.
As described above, according to the present embodiment, the clogging of the lateral drain pipes 5 can be monitored without observing the lateral drain pipes 5. This can prevent cleaning from being performed at an unnecessary timing or conversely, prevent the store from being soaked with water due to prolonged cleaning.
In the present embodiment, a water detection sensor 76 and an air pressure sensor 78 are provided, and the clogging of the lateral drain pipes 5 is monitored based on the sensor data. The type of sensor is not limited to this, and other types of sensors may be used. For example, a grease sensor may be provided in the drain through hole 75 to collect the proportion of grease contained in the drain water. Further, an air pressure sensor may be used instead of the wind pressure sensor 78.
In the present embodiment, two water detection sensors 76a and 76b are provided in the main body 73 in order to detect the water level, but the number of water detection sensors 76a and 76b is not limited to this. The water level can be detected more precisely by providing a plurality of sensors. The mounting positions of the water detection sensors 76a and 76b need not be limited to the main body 73. For example, a plate-shaped mounting plate (more specifically, a plate having a cross section in the shape of "124676767and recessed toward the drain outflow side of the drain lateral pipe 5) may be protruded from the main body 73 toward at least one of the through holes 74 and 75, and the water detection sensor 76 may be provided in the recess of the mounting plate, so that a plurality of water detection sensors 76 may be provided.
In the present embodiment, the drain pipe clogging monitoring device 7 is attached to the lateral drain pipe 5 as an example of the lateral pipe, but may be attached to another lateral pipe, for example, a lateral drain main pipe.
Claims (6)
1. A drain blockage monitoring device is characterized by comprising:
a tubular frame portion fixed to an inner surface of a horizontal pipe in the vicinity of a drain inflow side of the horizontal pipe;
a water level detection unit that detects a water level of drain water flowing from a drain outflow side of the horizontal pipe to a position of the frame portion; and
a transmitting unit which transmits data related to the water level detected by the water level detecting unit to a central monitoring apparatus,
the water level detection unit includes a plurality of water detection sensors that detect water discharge and detect a water level of the water discharge flowing backward, and the plurality of water detection sensors are arranged in a vertical direction on a drain outflow side of the horizontal pipe of the frame portion.
2. The drain blockage monitoring device according to claim 1, comprising:
a main body portion that divides an inside of the frame portion into upper and lower two portions along a longitudinal direction of the frame portion;
a drain through hole corresponding to a lower side in the frame divided by the body; and
and an air through hole corresponding to an upper side of the frame divided by the body.
3. The drain blockage monitoring device according to claim 2,
the drain pipe clogging monitoring device is provided with a wind pressure measuring unit attached to the air through hole,
the transmitting means transmits data relating to the wind pressure measured by the wind pressure measuring means to the central monitoring apparatus.
4. The drain blockage monitoring device of claim 2,
a plurality of concave portions are provided on a side surface of the main body portion on a drain outflow side of the cross pipe, and the water detection sensors are attached to the concave portions, respectively, facing the drain outflow side of the cross pipe.
5. A drain blockage monitoring system, said drain blockage monitoring system comprising:
the drain blockage monitoring device according to any one of claims 1 to 4; and
the central monitoring device is used for monitoring the operation of the central monitoring device,
the central monitoring device includes:
a receiving unit that receives data transmitted from the drain pipe clogging monitoring apparatus; and
and a presentation unit that presents the data received by the reception unit and clogging condition information indicating a clogging condition of a horizontal pipe to which the drain clogging monitoring device is attached.
6. The drain blockage monitoring system of claim 5,
the monitoring device is provided with a notification unit for notifying the corresponding information for the blockage of the transverse pipe which can be predicted according to the blockage condition information.
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JP2019088838A JP6914294B2 (en) | 2019-05-09 | 2019-05-09 | Drainage pipe clogging monitoring device and drainage pipe clogging monitoring system |
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CN208155399U (en) * | 2018-06-06 | 2018-11-27 | 北京京铁房地产开发有限公司 | A kind of discharge pipe line blocking early warning system |
CN109084860A (en) * | 2018-06-29 | 2018-12-25 | 深圳市广和通无线通信软件有限公司 | Detection device and detection system applied to drainage jam detection |
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JP2020183675A (en) | 2020-11-12 |
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