Blast equipment protection device

Abstract

The utility model discloses a blast equipment protection device which comprises a first sampling pipe, a second sampling pipe and a differential pressure transducer, one end of the second sampling pipe is located in a low-pressure area in blast equipment, and the other end of the second sampling pipe is connected with the differential pressure transducer through a second pressure measuring pipe. One end of the first sampling pipe faces the coming direction of air blown out by a fan of the blast equipment, the other end of the first sampling pipe is connected with the differential pressure sensor through the first pressure measuring pipe, and the first sampling pipe and the second sampling pipe are fixedly connected with an air duct of the blast equipment in a penetrating manner. When the air inlet or the air outlet of the fan is blocked due to reasons or the fan has problems due to mechanical or electrical reasons, the difference value between the air pressure and the static pressure is reduced, and when the difference value exceeds a set range, the controller controls downstream high-power load equipment to stop or sends out an audible and visual alarm through the alarm to inform related personnel of timely processing. And reasons are found and faults are eliminated, so that downstream high-power load equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, in particular to a protection device for a blower equipment. Background Art

[0002] A fan is a commonly used air supply equipment, which provides air with a certain flow rate and pressure to the equipment through an air duct. When the fan is running, if abnormal situations occur, such as blockage of the inlet and outlet or the outlet due to the operating environment, or the fan gets stuck due to inhaling foreign objects or other reasons, resulting in the blocking of the driving motor, the air volume of the fan will be significantly reduced. If these abnormalities are not detected in time, the driving motor of the fan will be burned out, resulting in damage to the fan, and it will also affect the normal operation of related high-power load equipment, and even cause accidents.

[0003] The patent application with the publication number CN111237980A discloses a detection method for the blockage of a fan filter, including: detecting the fan speed, and collecting the fan torque current when it is confirmed that the fan speed is at a constant speed; comparing the collected fan torque current with a preset fan torque current, and confirming whether the fan filter is blocked according to the comparison result; if the fan torque current is greater than the preset fan torque current, it is confirmed that the fan filter is blocked; initiating a filter blockage warning. Since the collected current is related not only to whether the fan is blocked, but also to factors such as the bearing of the driving motor and the degree of motor aging, it is impossible to accurately determine whether the fan is blocked based on the current data.

[0004] A filter blockage detection method, device, electronic device and storage medium disclosed in the patent application with the publication number CN113339936B obtain the fan torque current of the air guide plate at multiple different set positions; compare the multiple fan torque currents to obtain a first comparison result; compare each fan torque current with a corresponding preset torque current threshold to obtain a second comparison result; determine whether the filter is blocked according to the first comparison result and the second comparison result. When both the first comparison result and the second comparison result are determined that the filter is blocked, it is determined that the filter is blocked. Since it uses the method of comparing the current magnitude to determine whether the fan is blocked, it is also impossible to accurately determine whether the fan is blocked. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a protection device for a blower equipment, which can detect in time after the air volume of the fan is significantly reduced, and prevent the fan from being damaged and affecting the normal operation of related high-power load equipment.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] An air-blowing equipment protection device includes a first sampling pipe, a second sampling pipe and a differential pressure sensor. One end of the second sampling pipe is located in the area with lower pressure inside the air-blowing equipment, and the other end is connected to the differential pressure sensor through a second pressure measuring pipe. One end of the first sampling pipe faces the direction from which the wind blown by the fan of the air-blowing equipment comes, and the other end is connected to the differential pressure sensor through a first pressure measuring pipe. Both the first sampling pipe and the second sampling pipe are fixedly connected through the air duct of the air-blowing equipment.

[0008] Further, the axis of the second sampling pipe is perpendicular to the flowing direction of the wind in the air duct, and the second sampling pipe is fixedly connected through the side surface of the air duct.

[0009] Further, an annular pressure equalizing pipe is fixedly arranged outside the air duct. There are at least two second sampling pipes evenly distributed around the air duct. The outer ends of the second sampling pipes are all connected to the pressure equalizing pipe, and the pressure equalizing pipe is connected to the second pressure measuring pipe.

[0010] Further, there are at least two fans fixedly arranged on the end plate of the air duct. The number of the first sampling pipes is the same as the number of the fans. All the fans are axial flow fans. The inner ends of the first sampling pipes are connected to each other and then connected to the first pressure measuring pipe. The outer ends of the first sampling pipes respectively penetrate through the flow guide covers of the fans and bend towards the direction from which the wind comes.

[0011] Further, electromagnetic valves are arranged on all the first sampling pipes.

[0012] Further, the second sampling pipe is fixedly connected through the end plate at the end of the air duct, and the inner end of the second sampling pipe is in the same direction as the direction in which the wind goes.

[0013] Further, there are four fans. The cross-section of the air duct is square. The four fans are arranged in a "field" shape on the end plate at the end of the air duct. The inner ends of the first sampling pipes are connected to each other to form a cross shape.

[0014] The positive effects of the present utility model are as follows:

[0015] The present utility model is provided with a first pressure measuring pipe, a second pressure measuring pipe and a differential pressure sensor. The first pressure measuring pipe is connected to the differential pressure sensor through the first sampling pipe, and the second pressure measuring pipe is connected to the differential pressure sensor through the second sampling pipe. The first pressure measuring pipe is used to measure the wind pressure at the air outlet of the fan, and the second pressure measuring pipe is used to measure the static pressure inside the air duct. When the air inlet or air outlet of the fan is blocked due to reasons, or the fan itself has problems due to mechanical or electrical reasons, the wind pressure at the air outlet of the fan decreases, so that the difference between the wind pressure and the static pressure decreases. When the difference exceeds the set range, the fan operation is stopped, and the controller controls the high-power load equipment downstream to stop or gives an audible and visual alarm through an alarm to notify relevant personnel to process in time, find the reason and eliminate the fault, so as to protect the high-power load equipment downstream. Brief Description of the Drawings

[0016] Figure 1 is a perspective view of Embodiment 1;

[0017] Figure 2 is Figure 1 the left side view of;

[0018] Figure 3 is an internal schematic diagram of the present utility model after removing the side plate on one side;

[0019] Figure 4 is Figure 3 the partial enlarged view of part I in;

[0020] Figure 5 is an internal schematic diagram of the present utility model in Embodiment 2;

[0021] Figure 6 is a schematic diagram of Embodiment 3;

[0022] Figure 7 is a schematic diagram of Embodiment 4;

[0023] In the figure:

[0024] 1, air duct; 2, fan; 3, first pressure measuring tube; 4, differential pressure sensor; 5, second pressure measuring tube; 6, flow deflector; 7, first sampling tube; 8, notch; 9, pressure equalizing tube; 10, second sampling tube; 11, solenoid valve. Detailed Description of the Preferred Embodiments

[0025] Embodiment 1

[0026] As Figures 1 to 4 shown, the air blowing device includes an air duct 1 with a square cross-section. The air duct 1 is formed by sheet metal connection of four side plates and one end plate. Four circular mounting holes are formed in a cross shape on the end plate. Four fans 2 are mounted on the end plate. All four fans 2 are axial fans, and the flow deflectors of the four fans 2 respectively penetrate the corresponding mounting holes. The air duct 1 is connected to the air-using device. When the four fans 2 operate, they provide air with a certain pressure and flow rate to the corresponding device.

[0027] A protection device for the air blowing device includes a first sampling tube 7, a second sampling tube 10 and a differential pressure sensor 4. One end of the second sampling tube 10 is located in the area with lower pressure inside the air blowing device, and the other end is connected to a pressure measuring port of the differential pressure sensor 4 through a second pressure measuring tube 5. One end of the first sampling tube 7 faces the direction of the air blown by the fan 2 of the air blowing device, and the other end is connected to another pressure measuring port of the differential pressure sensor 4 through a first pressure measuring tube 3. Both the first sampling tube 7 and the second sampling tube 10 are fixedly connected to the air duct 1 of the air blowing device through penetration.

[0028] There are four first sampling tubes 7. The inner ends of the four first sampling tubes 7 are connected to each other to form a cross shape, and each first sampling tube 7 is arranged along the radial direction of the corresponding fan 2. The inner end of the first pressure measuring tube 3 penetrates through the end plate of the air duct 1 and extends between the flow guide covers 6 of the four fans 2. The inner ends of the four first sampling tubes 7 and the first pressure measuring tube 3 are connected by a five-way joint.

[0029] At one end close to the first pressure measuring tube 3, each flow guide cover 6 of the fan 2 is provided with a notch 8, and the first sampling tubes 7 are respectively located in the corresponding notches 8. The outer end of each first sampling tube 7 is fixedly connected with a 90-degree elbow, and the outer end of each 90-degree elbow faces the direction of the wind blown by the corresponding fan 2.

[0030] The second sampling tube 10 is fixedly connected through the end plate at the end of the air duct 1. The inner end of the second sampling tube 10 is in the same direction as the direction of the wind. The inner end of the second sampling tube 10 is located between the flow guide covers 6 of the four fans 2, and the length of its extension into the air duct 1 is less than the height of the flow guide cover 6.

[0031] The working process of the present utility model is as follows:

[0032] The four fans 2 operate simultaneously. The wind pressures at the air outlets of the four fans 2 are respectively collected through the four first pressure measuring tubes 3, and then transmitted to the differential pressure sensor 4 through the first sampling tubes 7. The static pressure at the end of the air duct 1 is collected by the second sampling tube 10, and then transmitted to the differential pressure sensor 4 through the second sampling tube 5.

[0033] A differential pressure sensor is a sensor used to measure the difference between two pressures. The differential pressure sensor can be connected to a controller or an alarm. When the difference between the two pressures exceeds a preset range, the relevant equipment can be controlled (such as shut down) through the controller, or an alarm can be issued through the alarm to remind the relevant personnel that the equipment is abnormal and needs to be checked and processed in time.

[0034] When the four fans 2 are operating normally, the difference between the wind pressure collected by the first pressure measuring tube 3 and the static pressure collected by the second sampling tube 10 is within the set range, the air blowing equipment operates normally, and the high-power load equipment downstream of the air blowing equipment can operate normally.

[0035] When the air inlet or outlet of the fan 2 is blocked due to reasons, the difference between the wind pressure collected by the first pressure measuring pipe 3 and the static pressure collected by the second sampling pipe 10 decreases, and the value of the pressure difference can be displayed through the liquid crystal display panel. When the difference exceeds the set range, the operation of the fan is stopped and the high-power load equipment downstream is controlled by the controller to stop or an audible and visual alarm is issued through the alarm to notify relevant personnel to process it in time, find the reason and eliminate the fault, so as to protect the high-power load equipment downstream. When the fan 2 itself has problems due to mechanical or electrical reasons, the pressure difference will also decrease. When the difference exceeds the set range, the operation of the fan is stopped and the downstream equipment is controlled by the controller to stop or an audible and visual alarm is issued through the alarm to notify relevant personnel to process it in time, find the reason and eliminate the fault, so as to protect the high-power load equipment downstream.

[0036] The differential pressure sensor 4 can also be replaced by a differential pressure switch.

[0037] Embodiment 2

[0038] As Figure 5 shown, the difference between this embodiment and Embodiment 1 is that:

[0039] The installation position of the second sampling pipe 10 is different.

[0040] The second sampling pipe 10 is fixedly connected through the side plate at the top of the air duct 1, so the axis of the second sampling pipe 10 is perpendicular to the flow direction of the air in the air duct 1.

[0041] Embodiment 3

[0042] As Figure 6 shown, the difference between this embodiment and Embodiment 2 is that:

[0043] A rectangular ring-shaped pressure equalizing pipe 9 is fixedly arranged outside the air duct 1. The second sampling pipes 10 are at least four uniformly distributed around the air duct 1. The four second sampling pipes 10 are respectively fixedly connected through the corresponding side plates of the air duct 1. The outer ends of the second sampling pipes 10 are all connected to the pressure equalizing pipe 9, and the pressure equalizing pipe 9 is connected to the second pressure measuring pipe 5.

[0044] The four second sampling pipes 10 sample at four positions in the air duct 1 respectively, so the sampling result is more accurate.

[0045] Embodiment 4

[0046] As Figure 7 shown, the difference between this embodiment and Embodiment 1 is that:

[0047] Solenoid valves 11 are provided on the first sampling pipes 7. At the same time, one-way air valves are installed on each fan 2, so that air can only enter the air duct 1 from the outside and will not flow reversely. During actual operation, by controlling the four solenoid valves 11, cyclic sampling is performed on the four fans 2, and the pressure value of only one fan 2 is taken each time. When an abnormality occurs, it can be specifically determined which fan 2 has an abnormality, and then the faulty fan 2 is shut down, and the remaining fans 2 work normally, which can be used as an emergency to continue supplying air to ensure the continuity of production. After the production at this stage is completed, maintenance is carried out.

[0048] The description of the above-described embodiments is relatively detailed and specific, expressing the preferred embodiments of the present invention, and is only used to illustrate the technical ideas and features of the present invention. Its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, it is not limited to the present invention only. The patent scope of the present invention cannot be limited only by this embodiment. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present invention, for those researchers or technicians in the field, within the structure of the present invention, local improvements within the system and changes and transformations between subsystems are still within the patent scope of the present invention.

Claims

1. A protection device for a blast equipment, characterized in that, It includes a first sampling tube (7), a second sampling tube (10) and a differential pressure sensor (4). One end of the second sampling tube (10) is located in the area with lower pressure inside the air blowing device, and the other end is connected to the differential pressure sensor (4) through a second pressure measuring tube (5). One end of the first sampling tube (7) faces the direction from which the air is blown by the fan (2) of the air blowing device, and the other end is connected to the differential pressure sensor (4) through a first pressure measuring tube (3). Both the first sampling tube (7) and the second sampling tube (10) are fixedly connected to the air duct (1) of the air blowing device through penetration.

2. The protection device for a blast equipment according to claim 1, characterized in that, The axis of the second sampling tube (10) is perpendicular to the flow direction of the air in the air duct (1), and the second sampling tube (10) is fixedly connected to the side surface of the air duct (1) through penetration.

3. The protection device for a blast equipment according to claim 2, wherein, An annular pressure equalizing tube (9) is fixedly arranged outside the air duct (1). There are at least two second sampling tubes (10) evenly distributed around the air duct (1). The outer ends of the second sampling tubes (10) are all connected to the pressure equalizing tube (9), and the pressure equalizing tube (9) is connected to the second pressure measuring tube (5).

4. A protection device for a blast equipment according to claim 1, characterized in that, There are at least two fans (2) fixedly arranged on the end plate of the air duct (1). The number of the first sampling tubes (7) is the same as the number of the fans (2). All the fans (2) are axial flow fans (2). The inner ends of the first sampling tubes (7) are connected to each other and then connected to the first pressure measuring tube (3). The outer ends of the first sampling tubes (7) respectively penetrate through the flow guide covers (6) of the fans (2) and bend towards the direction from which the air comes.

5. The protection device for a blast equipment according to claim 4, characterized in that, Electromagnetic valves (11) are arranged on all the first sampling tubes (7).

6. The protection device for a blast equipment according to claim 1, wherein, The second sampling tube (10) is fixedly connected to the end plate at the end of the air duct (1) through penetration, and the inner end of the second sampling tube (10) is in the same direction as the direction of the air flow.

7. The protection device for a blast equipment according to claim 4, characterized in that, There are four fans (2). The cross-section of the air duct (1) is square. The four fans (2) are arranged in a "field" shape on the end plate at the end of the air duct (1). The inner ends of the first sampling tubes (7) are connected to each other to form a cross shape.

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