Jet fan vibration on-line monitoring system

Abstract

The utility model discloses a jet fan vibration on-line monitoring system which comprises a plurality of jet fans, a plurality of double-channel vibration protection instruments, a protocol converter, a station BAS system, an industrial personal computer and a BAS displayer. The jet fan is provided with a speed type vibration sensor, the speed type vibration sensor is connected with the input end of a double-channel vibration protection instrument, the output end of the double-channel vibration protection instrument is divided into two branches, and the first branch is connected to a station BAS system; and the second branch is connected to the industrial personal computer and the BAS display which are connected in parallel through the protocol converter. The current operation condition of the monitored fan of the whole line is known in time through an online vibration protection and monitoring system; manual field investigation is avoided, judgment errors are reduced, the fault judgment time is shortened, the working efficiency is improved, and the working cost is saved. When the vibration protection instrument gives an alarm, the alarm is transmitted to a station equipment monitoring system (BAS), and a worker arranges inspection and maintenance in time, so that fault expansion is avoided.

Description

Technical Field

[0001] The utility model relates to the field of fan detection and the Internet of Things, and in particular to an online vibration monitoring system for a jet fan. Background Art

[0002] Jet fans and other fan equipment are mainly used in tunnel ventilation systems in subway ventilation and air-conditioning systems to provide full thrust. They can also be used in sensitive parts of semi-transverse ventilation systems or transverse ventilation systems, such as the entrance and exit of tunnels, to induce airflow or exhaust smoke. Jet fans are a special type of axial flow fans, consisting of collectors, mufflers, fairings, impellers, and impeller sections. Due to the ventilation function and effect requirements of jet fans, most jet fans are installed at the top of the tunnel, directly above the roads and tracks in the tunnel.

[0003] Jet fans are mainly used to comprehensively control the temperature, humidity, wind speed, and smoke exhaust in accident conditions in underground stations and section tunnels. The characteristics of this type of subway fans are complex operating conditions, poor operating conditions, and high failure rates. At the same time, there are many types of fan failures and the causes are also very complex. Fan failures mainly include: bearing vibration, high bearing temperature, impeller jamming, malfunction of protection devices, and loose fixed brackets. Among them, vibration is the most common disturbance factor in fan operation. It will directly affect the safe and stable operation of the fan. In severe cases, it will cause the equipment to loosen and fall off, causing accidents. Therefore, in order to ensure the safe and trouble-free operation of the subway, it is necessary to manage the jet fans installed in the subway track area in real time and carry out efficient maintenance.

[0004] Chinese patent document CN218266545U discloses a jet fan. The utility model discloses a jet fan, including a jet fan main body, two sides of the inner wall of the jet fan main body are threadedly connected with a mesh cover, the bottom of the outer wall of the jet fan main body is provided with a mounting seat, and the interior of the jet fan main body is provided with a dust removal mechanism, the dust removal mechanism includes a movable groove opened on one side of the inner wall of the jet fan main body, the inner wall of the movable groove is rotatably connected with a screw rod, the outer wall of the screw rod is threadedly connected with a folding block, and one side of the outer wall of the folding block is interlaced with an annular brush. The utility model discloses a jet fan annular brush placed in the jet fan main body and connected with the folding block. After rotating the fastening knob to connect the annular brush and the folding block, rotating the connecting knob causes the connecting shaft to drive the second bevel gear, the second bevel gear drives the first bevel gear to drive the screw rod, and the screw rod drives the folding block to drive the annular brush to move, so as to clean the dust attached to the inner wall of the jet fan main body. The operation is simple and easy to clean.

[0005] The existing jet exhaust fans only have the functions of exhausting and removing dirt, and their intelligence level is low. When the fan fails and parts become loose, they cannot be detected and eliminated in time by the staff, and timely warnings cannot be given. This will cause a huge manual burden. The equipment is prone to damage during operation with a fault, and in severe cases, parts may fall off, affecting road driving. This will not only make it impossible to use the fan, but also pose a threat to subway driving safety. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an online vibration monitoring system for a jet fan. The system sets a vibration measuring point in the horizontal, vertical and axial directions of the jet fan to monitor and judge common axial flow fan faults such as imbalance, misalignment, loose foundation, improper impeller assembly and bearing failure, so as to realize online vibration protection and the monitoring system can timely understand the current operating status of the monitored jet fans in the entire line.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A jet fan vibration online monitoring system, the system includes multiple jet fans, multiple dual-channel vibration protection instruments, a protocol converter, a station BAS system, an industrial computer and a BAS display; a vibration sensor is arranged on the jet fan, the vibration sensor is connected to the input end of the dual-channel vibration protection instrument, the output end of the dual-channel vibration protection instrument is divided into two branches, the first branch is connected to the station BAS system; the second branch is connected in parallel to the industrial computer and the BAS display after passing through the protocol converter;

[0009] As a preferred technical solution of the utility model, the vibration sensor is a velocity type vibration sensor, and the velocity type vibration sensor includes an X-axis vibration sensor, a Y-axis vibration sensor and an axial vibration sensor;

[0010] As a preferred technical solution of the utility model, the vibration sensor is connected to the dual-channel vibration protection instrument via a two-core double-shielded cable;

[0011] As a preferred technical solution of the utility model, the jet fan includes a casing, a platform is provided on the casing, and a vibration sensor is fixed on the platform;

[0012] As the preferred technical solution of the utility model, the signal of the dual-channel vibration protection instrument is converted into Ethernet through a protocol converter and then transmitted to the industrial computer and BAS display;

[0013] As a preferred technical solution of the utility model, the jet fan vibration online monitoring system uploads the operating status of the jet fan to the station BAS system, and the BAS display shows the operating status chart;

[0014] As a preferred technical solution of the utility model, the vibration sensor transmits a signal to the station BAS system through a dual-channel vibration protection instrument, and the station BAS system receives the vibration value of the jet fan through Ethernet.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. During the operation of the jet fan, the staff can use the online vibration protection and monitoring system at the control center of the line to timely understand the current operating status of the monitored fans of the entire line; this avoids on-site inspections by manpower and reduces manual judgment errors, shortens the time for fault judgment, improves work efficiency, and saves work costs.

[0017] 2. When the vibration value of the unit reaches the set alarm value, the vibration protection instrument will promptly alarm and transmit it to the station equipment monitoring system (BAS). The staff will arrange inspections and repairs in a unified manner based on the prompt signal to avoid the expansion of the fault and achieve the protection of the subway section ventilation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model system.

[0019] In the figure: 1. Jet fan; 2. Vibration sensor; 3. Dual-channel vibration protection instrument; 4. Protocol converter; 5. Station BAS system; 6. Industrial computer; 7. BAS display. DETAILED DESCRIPTION

[0020] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Figure 1 As shown, three velocity type vibration sensors are respectively arranged on the jet fans 1 and 2, and are installed at positions that comply with the corresponding safety specifications and national standards (determined by the fan manufacturer). The vibration sensors are connected to a dual-channel vibration protection meter (installed in an on-site instrument box or a fan control cabinet) through a two-core double-shielded cable.

[0022] Furthermore, a vibration measuring point is respectively arranged in the horizontal direction, the vertical direction and the axial direction of the jet fans 1 and 2, and a vibration sensor 2 is respectively arranged in the vertical direction, the horizontal direction and the axial direction to collect the vibration signal of the jet fan 1 online in real time.

[0023] Install the vibration sensor 2, make a platform with a diameter of 25mm on the casing, open an M6 screw hole and fix the sensor on the screw hole without performing any operation inside the machine.

[0024] Furthermore, the output signal of the vibration sensor 2 is collected to the online vibration monitoring system through the bus; in a typical product such as the PCM360 system, the signal is collected through the R485 bus.

[0025] The dual-channel vibration protection instrument 3 has the functions of on-site display, two-pole alarm relay output, alarm multiplication, RS485 interface, original signal buffer output and status monitoring, etc.

[0026] Moreover, the dual-channel vibration protection instrument 3 is distributedly installed in the fan control cabinet. The output alarm signal of the instrument is collected to the protocol converter 4 through the R485 bus, and then collected to the online vibration monitoring system (PCM360) of the line control center through the Ethernet of the subway line for centralized monitoring, overall diagnosis and unified processing.

[0027] The signal of the dual-channel vibration protection instrument 3 is converted from RS485 to Ethernet through the protocol converter 4, and the fan status monitoring information is transmitted to the control center through the subway network.

[0028] In addition, the dual-channel vibration protection instrument 3 provides an alarm relay output signal to the station environment and equipment monitoring system, and has alarm delay and alarm configuration functions. The BAS system 5 of each station receives the vibration value of the fan through Ethernet.

[0029] It should be noted that the effective value of vibration can be continuously monitored through the jet fan vibration online monitoring system and uploaded to the station BAS system 5. According to the relevant standards of vibration monitoring, the severity of the fault is determined and the alarm value is determined. It can be set to two levels of alarm, namely alarm and interlocking shutdown.

[0030] Furthermore, each station is provided with an independent visible IP address. The control center reserves an industrial computer 6, which is installed with vibration monitoring online data acquisition and analysis software. The jet fan vibration online monitoring system uploads the jet fan operation status to the station BAS system 5. The vibration status monitoring display software is embedded in the BAS, so that the control center BAS can monitor the operation status of the fans at all stations along the line and display the vibration value, alarm status and various operation status charts of the jet fan.

[0031] Working principle of this system:

[0032] In the present system, one or more jet fans 1 are arranged, and a vibration sensor 2 is arranged in the vertical, horizontal and axial directions of the jet fan 1 respectively, to collect the vibration signal of the jet fan 1 online in real time, and transmit the vibration information to the corresponding dual-channel vibration protection meter 3 through a two-core double-shielded cable. The signal of the dual-channel vibration protection meter 3 is converted from RS485 to Ethernet through a protocol converter 4, and the fan status monitoring information is transmitted to the industrial computer 6 and the BAS display 7 through the subway network; when the vibration value of the unit reaches the set alarm value, the vibration protection meter will alarm in time and transmit it to the station BAS system 5.

[0033] The utility model uses the above embodiments to illustrate the technical concept of the utility model, but the utility model is not limited to the above embodiments, that is, it does not mean that the utility model must rely on the above embodiments to be implemented. Those skilled in the art should understand that the relevant improvements to the utility model fall within the protection scope and disclosure scope of the utility model.

Claims

1. A jet fan vibration online monitoring system, It is characterized in that The system comprises a plurality of jet fans (1), a plurality of dual-channel vibration protection instruments (3), a protocol converter (4), a station BAS system (5), an industrial computer (6) and a BAS display (7); a vibration sensor (2) is arranged on the jet fan (1), the vibration sensor (2) is connected to the input end of the dual-channel vibration protection instrument (3), the output end of the dual-channel vibration protection instrument (3) is divided into two branches, the first branch is connected to the station BAS system (5); the second branch is connected in parallel to the industrial computer (6) and the BAS display (7) via the protocol converter (4).

2. The jet fan vibration online monitoring system according to claim 1, It is characterized in that The vibration sensor (2) is a velocity type vibration sensor, which comprises an X-direction vibration sensor, a Y-direction vibration sensor and an axial direction vibration sensor.

3. The jet fan vibration online monitoring system according to claim 2, It is characterized in that The vibration sensor (2) is connected to a dual-channel vibration protection instrument (3) via a two-core double-shielded cable.

4. The jet fan vibration online monitoring system according to claim 1, It is characterized in that The jet fan (1) comprises a casing, a platform is arranged on the casing, and a vibration sensor (2) is fixedly arranged on the platform.

5. The jet fan vibration online monitoring system according to claim 1, It is characterized in that The signal of the dual-channel vibration protection instrument (3) is converted into Ethernet through a protocol converter (4) and then transmitted to an industrial computer (6) and a BAS display (7).

6. The jet fan vibration online monitoring system according to claim 1, It is characterized in that The jet fan vibration online monitoring system uploads the operating status of the jet fan (1) to the station BAS system (5), and the BAS display (7) displays a status chart during operation.

7. The jet fan vibration online monitoring system according to claim 1, It is characterized in that The vibration sensor (2) transmits a signal to the station BAS system (5) via a dual-channel vibration protection instrument (3), and the station BAS system (5) receives the vibration value of the jet fan (1) via Ethernet.

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