Base station ventilation system self-cleaning air filter device

Abstract

The application relates to the technical field of communication base station environment control, in particular to a base station ventilation system self-cleaning air filter device which comprises a frame body, a filter screen and a transmission assembly, the frame body is provided with a fresh air mode air inlet and a refrigeration mode air inlet; the filter screen is arranged in the frame body and used for filtering air; the transmission assembly is connected with the filter screen and can drive the filter screen to move to the fresh air mode air inlet or the refrigeration mode air inlet under the driving of a driver. The device integrates automatic switching of a filtering position, self-cleaning, filter screen shaping and intelligent control functions, can realize full-process automation of base station air filtration without additional supporting of other equipment, and reduces equipment floor area and system complexity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication base station environment control, and in particular to a base station ventilation system self-cleaning air filter device. BACKGROUND

[0002] In the daily operation of a communication base station, the quality of ambient air is crucial to the service life and operational stability of equipment. Traditional base station air filter devices mostly use paper or fiber filter cartridges, which are prone to clogging in dusty and humid environments, resulting in an increase of more than 30% in the energy consumption of base station air conditioners. Moreover, they cannot achieve automatic cleaning and need to be replaced regularly. At the same time, some existing self-cleaning filter screens cannot work in coordination with base station air conditioning systems and lack precise position control, resulting in operational lag. SUMMARY

[0003] The present application provides a base station ventilation system self-cleaning air filter device to solve the problem that traditional base station air filter devices in the prior art are prone to clogging in dusty and humid environments, resulting in an increase in the energy consumption of base station air conditioners, and cannot achieve automatic cleaning and need to be replaced regularly.

[0004] The present application provides a base station ventilation system self-cleaning air filter device, comprising:

[0005] a frame, the frame being provided with a fresh air mode air inlet and a refrigeration mode air inlet;

[0006] a filter screen, disposed in the frame, for filtering air;

[0007] a transmission assembly, connected to the filter screen, capable of moving the filter screen to the fresh air mode air inlet or the refrigeration mode air inlet under the drive of a driver.

[0008] In a possible design, the device further comprises a back-blowing assembly, disposed in the frame and located at the leeward side of the filter screen, for blowing air to the windward side of the filter screen to clean the filter screen, and the transmission assembly is capable of moving the filter screen to the position of the fresh air mode air inlet, the refrigeration mode air inlet or the back-blowing assembly.

[0009] In a possible design, the back-blowing assembly comprises:

[0010] a dust collection box, disposed in the frame, the dust collection box having a dust inlet;

[0011] an air knife, disposed in the frame and opposite to the dust inlet, for blowing dust on the filter screen into the dust collection box through the dust inlet;

[0012] a blower, in communication with the air knife.

[0013] In a possible design, the transmission assembly includes two groups symmetrically arranged on the inner wall of the frame body, each group of the transmission assembly includes a driving sprocket, a driven sprocket and a chain sleeved on the driving sprocket and the driven sprocket, and the opposite sides of the filter screen are respectively mounted on the chains.

[0014] In a possible design, the transmission assembly further includes a first guide wheel and a second guide wheel, the first guide wheel and the second guide wheel are used to make the filter screen form an arc shape bending towards the air knife at the dust inlet.

[0015] In a possible design, a rotary encoder is further included, the rotary encoder is arranged on the shaft of the driving sprocket, and a controller is used to acquire the position of the filter screen according to the rotary encoder.

[0016] In a possible design, a differential pressure sensor is further included, the controller is used to determine whether the filter screen moves to the position of the back blowing assembly according to a differential pressure value collected by the differential pressure sensor, and the filter screen moves to the position of the back blowing assembly when the differential pressure value collected by the differential pressure sensor is greater than a threshold value.

[0017] In a possible design, the remaining service life of the filter screen is S, the cumulative running time of the filter screen is t, and the differential pressure value collected by the differential pressure sensor is ΔP, S = 100% - (K1·t + K2·ΔP), K1 and K2 are proportional coefficients.

[0018] In a possible design, a pair of shaping rollers are further included, the shaping rollers are arranged on the downstream side of the back blowing assembly, the filter screen after back blowing passes between the two shaping rollers, and the net surface is flattened through extrusion of the shaping rollers.

[0019] In a possible design, the apparatus further includes:

[0020] A plurality of laser displacement sensors are arranged on one side of the filter screen in the transverse direction of the filter screen, and are used to detect whether there is a local depression in the filter screen and the direction of the depression;

[0021] A plurality of pulse-type elastic pins are arranged on both sides of the filter screen in the transverse direction of the filter screen and are located on the downstream side of the laser displacement sensors;

[0022] An electromagnetic push rod is connected with the pulse-type elastic pins, the electromagnetic push rod drives the corresponding pulse-type elastic pin to act on the filter screen according to the depression signal collected by the laser displacement sensor, the depression part of the filter screen is flattened, and the delay time of the action of the electromagnetic push rod is equal to the time of the depression part of the filter screen moving from the laser displacement sensor to the pulse-type elastic pin.

[0023] The application has the following beneficial effects:

[0024] 1. The device integrates automatic switching of filter position, self-cleaning, filter shaping and intelligent control functions, without the need for additional supporting equipment, which can realize the full process automation of base station air filtration, reduce equipment floor area and system complexity.

[0025] 2. By working with the air conditioner, the filter position is automatically switched according to the air conditioner mode to avoid invalid filtration, and the self-cleaning function does not need to replace the filter element, which reduces the air conditioner energy consumption by 30-40%, and significantly reduces the base station operating cost.

[0026] 3. With filter life prediction and fault alarm function, the remote monitoring platform can obtain the device running state in real time, reduce the frequency of manual inspection, manual intervention is reduced by more than 80%, and the operation and maintenance efficiency is greatly improved.

[0027] 4. The filter is made of stainless steel and does not need to be replaced for life, and the shaping assembly can effectively solve the problem of filter deformation after backwashing, ensuring that the filter maintains good filtration performance and smooth transmission for a long time, and ensuring the stable operation of the base station equipment. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 The structure diagram of the base station ventilation system self-cleaning air filter device provided by the embodiment of the present application is shown in the figure.

[0030] Figure 2 The front view of the base station ventilation system self-cleaning air filter device provided by the embodiment of the present application is shown in the figure.

[0031] Figure 3 The sectional view of A-A in the figure. Figure 2

[0032] Figure 4 The internal structure diagram is shown in the figure.

[0033] Figure 5 The structure diagram of the shaping assembly of the base station ventilation system self-cleaning air filter device provided by the embodiment of the present application is shown in the figure.

[0034] Reference signs:

[0035] ​100, frame; 110, fresh air mode air inlet; 120, refrigeration mode air inlet; 200, filter screen; 300, transmission assembly; 310, driving sprocket; 320, driven sprocket; 330, chain; 340, first guide wheel; 350, second guide wheel; 400, back flushing assembly; 410, dust collection box; 411, dust inlet; 420, air knife; 430, air blower; 500, rotary encoder; 600, controller; 700, differential pressure sensor; 810, shaping roller; 820, laser displacement sensor; 830, pulse elastic ejector pin; 840, electromagnetic push rod. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] The base station ventilation system self-cleaning air filter device provided in the embodiments of the present application will be described below in conjunction with Figures 1-5

[0038] Referring to FIG. 1, the base station ventilation system self-cleaning air filter device provided in the embodiments of the present application includes a frame 100, a filter screen 200, and a transmission assembly 300. Figures 1-3

[0039] The frame 100 is made of stainless steel and serves as the basic support structure of the device. It has good corrosion resistance and structural strength and can adapt to complex environments outdoors or semi-outdoors of a base station. Two functional air inlets are formed on the frame 100, namely a fresh air mode air inlet 110 and a refrigeration mode air inlet 120. When the base station air conditioner is in the over-season and operates in the fresh air mode, external air enters the device through the air inlet and is delivered to the base station machine room after being filtered by the filter screen, thereby achieving natural ventilation and heat dissipation. When the base station air conditioner is in the refrigeration season and operates in the refrigeration mode, air supply of the air conditioner enters the device through the air inlet and enters the machine room after being filtered by the filter screen, thereby avoiding pollution of the machine room environment by impurities carried by the air supply of the air conditioner.

[0040] The two air inlets are arranged at intervals along the height direction of the frame 100 and are each provided with a sealing frame. When the filter screen moves to the position of the corresponding air inlet, it can be tightly attached to the sealing frame to prevent unfiltered air from entering through the gap and ensure the filtering effect.

[0041] ​​The filter screen 200 is made of a deformable steel screen of 304 stainless steel material, has good wear resistance and corrosion resistance, and can be used repeatedly for a long time without frequent replacement. The filter screen can also be combined with an electrostatic adsorption screen. The filter screen has a mesh structure, and the pore size can be adjusted according to the environmental requirements of the base station (adjustment range 0.1-2mm). At the same time, the surface of the filter screen is sprayed with a nano-level corrosion-resistant coating, which further improves the service life in harsh environments such as high salt mist and high dust. The filter screen is arranged in the frame body 100 and can move under the drive of the transmission assembly 300 to realize the docking with different air inlets and the cooperation with the blowback assembly 400.

[0042] The transmission assembly 300 is connected with the filter screen, and under the drive of a driver (such as a stepper motor), the transmission assembly 300 can drive the filter screen to move along the inside of the frame body 100 to accurately dock with the fresh air mode air inlet 110, the refrigeration mode air inlet 120 or the blowback assembly 400 position.

[0043] Referring to Figure 3 As shown in the figure, the transmission assembly 300 includes two groups symmetrically arranged on the inner wall of the frame body 100, and each group of the transmission assembly 300 is composed of a driving sprocket 310, a driven sprocket 320, a chain 330, a first guide wheel 340 and a second guide wheel 350. The driving sprocket 310 is connected with the output shaft of the driver, the driven sprocket 320 is fixed to one end of the frame body 100 away from the driving sprocket 310 through a support, and the chain 330 is sleeved on the driving sprocket 310 and the driven sprocket 320 to form a closed loop transmission structure.

[0044] The opposite edges of the filter screen are fixed to the two groups of chains 330 by bolts or buckle structures, and when the driver drives the driving sprocket 310 to rotate, the chain 330 drives the filter screen to move synchronously to realize the position adjustment of the filter screen.

[0045] The first guide wheel 340 and the second guide wheel 350 are installed on the frame body 100 through a rotating shaft at a position corresponding to the blowback assembly 400, and the two guide wheels are arranged in a spaced manner along the moving direction of the filter screen, and the wheel surface is in close contact with the surface of the filter screen. When the filter screen moves to the position of the blowback assembly 400, the first guide wheel 340 and the second guide wheel 350 can make the filter screen form an arc-shaped structure bending towards the air knife 420 at the dust inlet 411 of the dust collecting box 410. The arc-shaped structure can increase the contact area of the filter screen and the air outlet of the air knife 420, ensure that the blowback airflow can uniformly act on the surface of the filter screen, and improve the dust removal effect. At the same time, the arc-shaped structure can avoid the filter screen from being deformed too much due to local strong wind force.

[0046] The blowback assembly 400 is arranged in the frame body 100 and located at the leeward side of the filter screen, and is used to blow air to the windward side of the filter screen when the filter screen is blocked to remove the dust accumulated on the filter screen and realize self-cleaning of the filter screen.

[0047] Referring to Figure 3 , Figure 4As shown, the back-blowing assembly 400 includes a dust collection box 410, an air knife 420, and a blower 430. The dust collection box 410 adopts a sealed box structure and is fixed to the frame 100 at a position corresponding to the curved shape of the filter screen. The dust collection box 410 is provided with a dust inlet 411 on the side facing the filter screen, and the shape of the dust inlet 411 is matched with the curved shape of the filter screen to ensure that all the dust blown off the filter screen can enter the dust collection box 410. The dust collection box 410 is also provided with a detachable dust collection drawer at the bottom to facilitate regular cleaning of the collected dust. The air knife 420 is fixed to the frame 100 and located opposite the dust inlet 411 of the dust collection box 410. The air outlet of the air knife 420 is in a strip shape and matched with the width of the filter screen to blow high-pressure air flow onto the surface of the filter screen. The air knife 420 is provided with an air flow distribution cavity inside to ensure that the air flow pressure at each position of the air outlet is uniform to avoid dust residue caused by insufficient local air flow pressure. The blower 430 is connected to the air knife 420 through an air pipe and adopts a high-pressure centrifugal blower 430 to provide high-pressure air flow with a wind pressure ≥ 50 kPa. When the filter screen needs to be cleaned, the blower 430 is started, and the high-pressure air flow is uniformly blown to the windward surface of the filter screen through the air knife 420 to blow off the dust on the filter screen and enter the dust collection box 410 through the dust inlet 411 of the dust collection box 410 for collection.

[0048] The control assembly is used to realize precise control of the position of the filter screen, automatic triggering of back-blowing cleaning, and prediction of the service life of the filter screen, and includes a rotary encoder 500, a controller 600, and a differential pressure sensor 700.

[0049] Referring to Figure 4 As shown, the rotary encoder 500 is arranged on the shaft of the driving sprocket 310 and electrically connected with the controller 600. When the driving sprocket 310 rotates, the rotary encoder 500 rotates synchronously and outputs a pulse signal. The controller 600 can calculate the rotation angle and rotation speed of the driving sprocket 310 by receiving the number and frequency of the pulse signal, and then determine the moving distance and current position of the filter screen to realize precise positioning of the filter screen with a positioning accuracy of ±0.1 mm.

[0050] The two detection ends of the differential pressure sensor 700 are arranged on the windward surface and the leeward surface of the filter screen, respectively, for detecting the pressure difference between the two sides of the filter screen. When the dust accumulated on the filter screen increases, the pressure difference between the two sides of the filter screen increases. When the pressure difference is greater than a preset threshold value (such as 150 Pa), the controller 600 determines that the filter screen needs to be cleaned, and at this time, the control transmission assembly 300 drives the filter screen to move to the position of the back-blowing assembly 400 to start the back-blowing assembly 400 for cleaning.

[0051] The controller 600 adopts a PLC controller 600, which is electrically connected with the driver, the air blower 430, the rotary encoder 500, and the differential pressure sensor 700 respectively, and is the control core of the device. The controller 600 can not only control the position of the filter screen according to the signal of the rotary encoder 500, but also trigger the back-blowing cleaning according to the signal of the differential pressure sensor 700, and can calculate the remaining life of the filter screen.

[0052] The calculation logic of the remaining life of the filter screen is as follows: assuming that the remaining life of the filter screen is S (expressed in percentage), the cumulative running time of the filter screen is t (unit: h), and the average differential pressure value of the filter screen collected by the differential pressure sensor 700 is ΔP (unit: Pa), the life calculation formula is S = 100% - (K1•t + K2•ΔP), wherein K1 and K2 are proportional coefficients, which are calibrated through a large amount of experimental data. For example, in a conventional sand dust environment, K1 is 0.005% / h, and K2 is 0.02% / Pa. The controller 600 can calculate the remaining life of the filter screen by substituting the values of t and ΔP into the formula in real time, and transmit the life data to the base station operation and maintenance platform, thereby providing a replacement or maintenance reference for the operation and maintenance personnel.

[0053] In order to solve the problem that the filter screen is easy to deform after back-blowing cleaning, the device is also provided with a shaping assembly and a detection assembly to realize the detection and repair of the deformation of the filter screen.

[0054] Referring to FIG. 8, Figure 5 The shaping roller 810 is arranged on the downstream side of the back-blowing assembly 400 and extends along the width direction of the frame body 100. Each group of the shaping roller 810 includes two oppositely arranged roller bodies. The outer layer of the roller body is made of silica gel material (hardness 50 Shore A), and the inner layer is a stainless steel mandrel. The filter screen 200 after back-blowing passes between the two shaping rollers 810. The shaping roller 810 rotates under the drive of the driver and simultaneously applies uniform pressure (pressure range 50-80N) to the filter screen. Through the extrusion effect, the overall curved and deformed part of the filter screen surface is flattened, and the flatness of the filter screen is ensured to be ≤0.5mm / m.

[0055] The pulse type elastic ejector pin 830 is arranged on both sides of the filter screen in the transverse direction of the filter screen and is located on the downstream side of the laser displacement sensor 820. The ejector pin is made of titanium alloy, and the top end is hemispherical to avoid scratching the surface of the filter screen. The electromagnetic push rod 840 is connected with the pulse type elastic ejector pin 830 one by one and can drive the ejector pin to act in the direction perpendicular to the surface of the filter screen.

[0056] The laser displacement sensor 820 includes a plurality of sensors and is arranged on one side of the filter screen in the transverse direction of the filter screen and is electrically connected with the controller 600. The laser displacement sensor 820 detects the distance from the filter screen surface by emitting a laser beam. When the filter screen has a local depression, the detection distance at the corresponding position will change. The sensor transmits the depression signal (including the depression position and the depression depth) to the controller 600.

[0057] After the controller 600 receives the recess signal, it calculates the time required for the filter screen recess position to move from the position of the laser displacement sensor 820 to the position of the pulsed elastic ejector pin 830, and controls the electromagnetic push rod 840 to act after a corresponding time delay, ensuring that when the recess position moves to the position of the ejector pin, the corresponding electromagnetic push rod 840 drives the ejector pin to act on the filter screen, flattening the recess position. For example, if the filter screen moves at a speed of 10 mm / s and the distance from the laser displacement sensor 820 to the position of the ejector pin is 50 mm, the electromagnetic push rod 840 will act after a delay of 5 s. Through this precise time matching, it can be ensured that each local recess can be accurately repaired.

[0058] Working principle:

[0059] When the base station air conditioner switches to fresh air mode, the controller 600 controls the transmission assembly 300 to move the filter screen to the fresh air mode air inlet 110 and fit with the air inlet sealing frame. External air enters the machine room after being filtered by the filter screen; when the air conditioner switches to cooling mode, the filter screen moves to the cooling mode air inlet 120 to filter the air supply of the air conditioner.

[0060] The differential pressure sensor 700 detects the differential pressure value on both sides of the filter screen in real time. When the differential pressure value is greater than the threshold value, the controller 600 controls the transmission assembly 300 to move the filter screen to the position of the reverse blowing assembly 400, so that the filter screen forms an arc under the action of the first guide wheel 340 and the second guide wheel 350. Then start the air blower 430, and blow high-pressure airflow to the filter screen through the air knife 420, and blow the dust into the dust collection box 410.

[0061] After reverse blowing, the filter screen continues to move to the position of the shaping roller 810 and is flattened by the shaping roller 810; at the same time, the laser displacement sensor 820 detects the local recess of the filter screen, and the controller 600 controls the electromagnetic push rod 840 to drive the pulsed elastic ejector pin 830 according to the detection signal to repair the local recess.

[0062] After shaping, the controller 600 controls the filter screen to move back to the original filtering position and continue to perform the filtering task; at the same time, the controller 600 calculates the remaining life of the filter screen in real time and uploads it to the operation and maintenance platform periodically. When the life is lower than the preset value, an early warning is issued.

[0063] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0064] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0065] In this application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0066] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0067] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A self-cleaning air filter device for a base station ventilation system, characterized in that, include: The frame has an air inlet for fresh air mode and an air inlet for cooling mode. A filter screen, disposed within the frame, is used to filter air; A transmission assembly, connected to the filter screen, can move the filter screen to the fresh air mode air inlet or the cooling mode air inlet under the drive of the driver; the transmission assembly includes two sets symmetrically arranged on the inner wall of the frame, each set of the transmission assembly includes a driving sprocket, a driven sprocket and a chain sleeved on the driving sprocket and the driven sprocket, and the opposite sides of the filter screen are respectively installed on the chain; A back-blowing component is disposed within the frame and located on the leeward side of the filter screen. It is used to blow air onto the windward side of the filter screen to clean the filter screen. The transmission component can drive the filter screen to move to the position of the fresh air mode air inlet, the cooling mode air inlet, or the back-blowing component. The backflush assembly includes: A dust collection box is disposed within the frame, and the dust collection box has a dust inlet. An air knife is installed inside the frame and is positioned opposite the dust inlet. It is used to blow dust from the filter screen into the dust collection box through the dust inlet. A blower is connected to the air knife; It also includes a rotary encoder and a controller, wherein the rotary encoder is mounted on the axle of the drive sprocket, and the controller obtains the position of the filter screen based on the rotary encoder; The controller uses a differential pressure sensor to determine whether the filter screen has moved to the position of the backflush assembly based on the differential pressure value collected by the differential pressure sensor. When the differential pressure value collected by the differential pressure sensor is greater than a threshold, the filter screen moves to the position of the backflush assembly. It also includes a pair of shaping rollers, which are located downstream of the backflushing assembly. The filter screen after backflushing passes between the two shaping rollers, and the screen surface is flattened by the squeezing of the shaping rollers. A laser displacement sensor, comprising multiple sensors, is arranged laterally along one side of the filter screen to detect whether the filter screen has local depressions and the direction of the depressions; Pulsed elastic pins are arranged laterally on both sides of the filter screen and located downstream of the laser displacement sensor. An electromagnetic push rod is connected to the pulsed elastic pin. The electromagnetic push rod drives the corresponding pulsed elastic pin to move towards the filter screen according to the concave signal collected by the laser displacement sensor, flattening the concave part of the filter screen. The action delay time of the electromagnetic push rod is equal to the time it takes for the concave part of the filter screen to move from the laser displacement sensor to the pulsed elastic pin.

2. The self-cleaning air filter device for a base station ventilation system according to claim 1, characterized in that, The transmission assembly further includes a first guide wheel and a second guide wheel, which are used to make the filter screen form an arc shape at the dust inlet that bends toward the air knife.

3. The self-cleaning air filter device for a base station ventilation system according to claim 1, characterized in that, The remaining lifespan of the filter is S, the cumulative operating time of the filter is t, and the differential pressure value collected by the differential pressure sensor is ΔP. ​​S = 100% - (K1·t + K2·ΔP), where K1 and K2 are proportionality coefficients.

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