Air filter backflush system and tractor

Abstract

The utility model relates to a kind of air filter backflush system and tractor, it is related to air filter equipment technical field, wherein, a kind of air filter backflush system, including air filter, air compressor, engine driving air compressor, air inlet communication the air outlet of air filter, gas cylinder and at least two groups of parallel backflush gas path of air inlet communication the air outlet of air compressor, each group backflush gas path includes air inlet communication the pressure control valve of gas cylinder outlet, backflush gas bottle and release valve of air inlet communication the backflush gas bottle outlet of pressure control valve outlet, the outlet of each release valve is all communicated the air outlet of air filter.The utility model can improve backflush efficiency, and reduce the possibility that dust backflushed is easily inhaled secondarily, improve backflush effect.

Description

Technical Field

[0001] This utility model relates to the field of air filter equipment technology, and in particular to an air filter backflushing system and a tractor. Background Technology

[0002] In the field of agricultural machinery, large agricultural equipment such as tractors typically operate in complex and harsh environments, often accompanied by large amounts of dust, particulate matter, and other impurities. The air filter is a critical protective device for tractor engines, its main function being to filter the air entering the engine, preventing dust and impurities from entering, thereby extending engine life and improving its efficiency. However, over time, a large amount of dust and impurities gradually accumulate inside the air filter, leading to filter blockage, increased intake resistance, and consequently affecting engine power output and fuel economy. Therefore, how to efficiently and reliably clean the dust accumulated inside the air filter has become a major issue in tractor design and maintenance.

[0003] Traditional air filter cleaning methods rely heavily on manual, periodic filter replacement. This not only increases maintenance costs and workload for users but can also lead to decreased engine performance or even malfunctions due to clogged filters. To address this issue, modern tractor designs have gradually incorporated air filter backflushing pneumatic systems. These automated pneumatic cleaning methods reduce manual intervention and improve equipment reliability and efficiency. Specifically, existing air filter backflushing pneumatic systems primarily use compressed air (such as compressed air from an air pump or engine) to backflush the air filter element and remove accumulated dust. This backflushing control method involves controlling the flow of compressed air via a solenoid valve or pneumatic valve, performing backflushing on the filter element periodically or intermittently. Compressed air is delivered to specific locations on the filter element through a pipeline system, and the high-speed airflow blows away dust from the filter element's surface.

[0004] The existing air filter backflushing pneumatic system can only achieve intermittent backflushing. After each backflushing operation, it is necessary to pressurize and re-flush before performing another backflushing operation. This backflushing method is inefficient, and the dust blown out is easily sucked back in, resulting in poor backflushing effect. Utility Model Content

[0005] This invention provides an air filter backflushing system and a tractor, which can improve backflushing efficiency and reduce the possibility of dust being re-inhaled after backflushing, thereby improving the backflushing effect.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides an air filter backflush system, including an air filter, an air compressor with its inlet connected to the air outlet of the air filter, an engine driving the air compressor, an air storage cylinder with its inlet connected to the air outlet of the air compressor, and at least two sets of parallel backflush air paths. Each set of backflush air paths includes a pressure control valve with its inlet connected to the air outlet of the air storage cylinder, a backflush air cylinder with its inlet connected to the air outlet of the pressure control valve, and a release valve with its inlet connected to the air outlet of the backflush air cylinder. The air outlet of each release valve is connected to the air outlet of the air filter.

[0007] The beneficial effects of this utility model are as follows: During use, driven by the engine, the air compressor draws filtered air from the air filter's pipeline and stores it in the air storage cylinder. After opening the pressure control valve, the backflush cylinder stores gas. When backflushing is needed, the release valve of one of the backflush air paths is opened, and the air filter is backflushed with the gas stored in the corresponding backflush cylinder, blowing off the dust accumulated on the air filter. When the gas in the backflush cylinder is completely released, the corresponding release valve is closed, and at the same time, another release valve is opened, and the air filter is backflushed with the gas stored in another backflush cylinder, blowing away the dust near the air filter. This process is repeated continuously to improve backflush efficiency and reduce the possibility of the backflushed dust being re-inhaled, thus improving the backflush effect.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, a differential pressure sensor is installed in the pipe connecting the air filter and the air compressor.

[0010] Furthermore, both the gas storage cylinder and each of the backflush gas cylinders are equipped with pressure sensors.

[0011] Furthermore, the set pressure value of the gas storage cylinder is P, the set maximum pressure value of each group of backflush air paths is P1, and each backflush gas cylinder is set with a pre-charge pressure value P2. P is greater than P1, which is greater than P2. When the pressure value of each backflush gas cylinder reaches P2 and gradually increases, the pressure value of each backflush gas cylinder is proportional to the value detected by the differential pressure sensor.

[0012] Furthermore, it also includes a controller, which is communicatively connected to the air compressor, the air tank, the pressure control valve, the backflush cylinder, the release valve, and the differential pressure sensor.

[0013] Furthermore, the outlet of the gas storage cylinder is also connected to other pneumatic systems, and the set pressure value P of the gas storage cylinder is equal to the working pressure value of the other pneumatic systems.

[0014] Furthermore, the pipeline connecting the air outlet of the air compressor and the air inlet of the air storage bottle is equipped with a cooling device.

[0015] Furthermore, a dryer is provided in the pipeline connecting the cooling device and the air inlet of the gas storage cylinder.

[0016] Furthermore, the backflush air path has two sets connected in parallel.

[0017] This utility model also provides a tractor, including the aforementioned air filter backflushing system. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the air filter backflushing system of this utility model.

[0019] The attached diagram lists the components represented by each number as follows: 1. Air filter; 2. Air compressor; 21. Cooling device; 22. Dryer; 3. Engine; 4. Air tank; 5. Backflush air path; 51. Pressure control valve; 52. Backflush air tank; 53. Relief valve; 6. Differential pressure sensor; 7. Controller; 8. Other pneumatic systems. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] Example 1 like Figure 1 An air filter backflush system includes an air filter 1, an air compressor 2 with its inlet connected to the outlet of the air filter 1, an engine 3 driving the air compressor 2, an air storage cylinder 4 with its inlet connected to the outlet of the air compressor 2, and at least two sets of parallel backflush air paths 5. Each set of backflush air paths 5 includes a pressure control valve 51 with its inlet connected to the outlet of the air storage cylinder 4, a backflush air cylinder 52 with its inlet connected to the outlet of the pressure control valve 51, and a release valve 53 with its inlet connected to the outlet of the backflush air cylinder 52. The outlet of each release valve 53 is connected to the outlet of the air filter 1.

[0022] In operation, driven by engine 3, air compressor 2 draws filtered air from the air filter 1 and stores it in air storage cylinder 4. After opening pressure control valve 51, it stores gas in backflushing cylinder 52. When backflushing is needed, the release valve 53 of one of the backflushing air paths 5 is opened, and the air filter 1 is backflushed with the gas stored in the corresponding backflushing cylinder 52, blowing off the dust accumulated on the air filter 1. When the gas in the backflushing cylinder 52 is released and the corresponding release valve 53 is closed, another release valve 53 is opened at the same time, and the air filter 1 is backflushed with the gas stored in the other backflushing cylinder 52, blowing away the dust near the air filter 1. This process is repeated continuously to improve backflushing efficiency and reduce the possibility of the backflushed dust being re-inhaled, thus improving the backflushing effect.

[0023] The number of backflush air passages 5 can be two, three, four or five, etc., but only two are shown in the figure.

[0024] In this first embodiment, a cooling device 21 is installed in the pipeline connecting the air outlet of the air compressor 2 and the air inlet of the air storage cylinder 4. The air is heated by compression after passing through the air compressor 2, and the cooling device 21 can cool down the air heated by compression as the delivery proceeds.

[0025] Furthermore, a dryer 22 is installed in the pipeline connecting the cooling device 21 and the air inlet of the gas storage cylinder 4. The cooled air must pass through the dryer 22 before being stored in the gas storage cylinder 4 to prevent water accumulation due to cooling in the gas storage cylinder 4.

[0026] Specifically, the cooling device 21 can be an air-cooled cooling device (such as a finned tube cooler or a fan-assisted cooler), a water-cooled cooling device (such as a shell-and-tube cooler or a plate cooler), or a combination of air-cooled and water-cooled cooling devices.

[0027] The dryer 22 can be an adsorption dryer or a freeze dryer.

[0028] Based on the above embodiment, the outlet of the gas cylinder 4 is also connected to other pneumatic systems 8, and the set pressure value P of the gas cylinder 4 is equal to the working pressure value of the other pneumatic systems 8. The gas cylinder 4 can simultaneously supply air to the backflush air path 5 and other pneumatic systems 8, and the backflush air path 5 is independent of the other pneumatic systems 8 to ensure stable air pressure during backflush.

[0029] Other pneumatic systems 8 are connected in parallel with each group of backflush air paths 5, so that they are independent of each other. Specifically, other pneumatic systems 8 can be pneumatic braking systems, pneumatic control systems, or pneumatic control systems for working devices, etc.

[0030] Based on the above embodiment, a differential pressure sensor 6 is installed in the pipe connecting the air filter 1 and the air compressor 2. The differential pressure sensor 6 detects the pressure difference between the air intake of the air filter 1 and the atmospheric pressure. The degree of blockage of the air filter 1 is determined by this pressure difference value. The larger the pressure difference value, the more serious the blockage. In this case, backflushing is required.

[0031] Furthermore, both the gas storage cylinder 4 and each backflush cylinder 52 are equipped with pressure sensors. The pressure sensors measure the gas pressure of the corresponding gas storage cylinder 4 or backflush cylinder 52 in real time to determine the gas storage volume. The higher the gas pressure, the more gas is stored, ensuring that the backflush operation can be carried out in real time.

[0032] Based on the above embodiment, the set pressure value of the gas storage cylinder 4 is P, the set maximum pressure value of each group of backflush gas paths 5 is P1, and each backflush gas cylinder 52 is set with a pre-charge pressure value P2. P is greater than P1, which is greater than P2. When the pressure value of each backflush gas cylinder 52 reaches P2 and gradually increases, the pressure value of each backflush gas cylinder 52 is proportional to the detection value of the differential pressure sensor 6.

[0033] P is greater than P1, which is greater than P2, to ensure that the gas storage cylinder 4 can charge each backflush cylinder 52 in real time. After the backflush operation is completed, the pressure control valve 51 is opened to charge the corresponding backflush cylinder 52 until the air pressure of the corresponding backflush cylinder 52 reaches the pre-charge air pressure value P2, so as to ensure that the backflush cylinder 52 always stores gas. During the operation, when the detection value of the differential pressure sensor 6 gradually increases, that is, blockage occurs and the blockage becomes more and more serious, when the detection value of the differential pressure sensor 6 reaches the set maximum air pressure value P1 of each group of backflush air paths 5, the controller 7 controls each backflush air path 5 to perform backflush operation in sequence. Through this backflush method, it is ensured that the air pressure of the backflush cylinder 52 corresponds exactly to the degree of blockage of the air filter 1. At the same time, the backflush frequency can be increased based on the degree of blockage. Therefore, the air pressure of the backflush cylinder 52 changes with the pressure difference detected by the differential pressure sensor 6. If the user wants to backflush the air filter in advance, it will not damage the filter element due to excessive backflush air pressure.

[0034] The air filter backflushing system of this invention also includes a controller 7, which is communicatively connected to the air compressor 2, the air tank 4, the pressure control valve 51, the backflushing air tank 52, the release valve 53, and the differential pressure sensor 6. The controller 7 controls the opening and closing of each device to achieve continuous backflushing operations and improve backflushing efficiency.

[0035] The control principle of the air filter backflushing system of this invention is as follows: ① After the pressure sensor of the gas cylinder 4 detects that the gas pressure P is lower than the working gas pressure of other pneumatic systems, it transmits the signal to the controller 7. The controller 7 controls the air compressor 2 to pressurize the gas cylinder 4 until it reaches the working gas pressure of other pneumatic systems 8. ② When the differential pressure sensor 6 (the larger the measured value, the more severe the blockage) detects that the pressure difference between the air intake of the air filter 1 and the atmosphere is greater than the pre-charge pressure value P2 of the backflush gas cylinder 52, the controller 7 can control the first backflush gas path 5 to perform backflush operation. Specifically, the controller 7 controls the release valve 53 of the first path to the release position, and the gas in the corresponding backflush gas cylinder 52 is released within 1 second. The release valve 53 of the first path is then reset. Subsequently, the second backflush gas path 5 of the backflush system performs backflush operation. Specifically, the controller 7 controls the release valve 53 of the second path to the release position, and the gas in the corresponding backflush gas cylinder 52 is released within 1 second. The release valve 53 of the second path is then reset (the first time it is blown open, and the second time it blows away the nearby dust). This process continues until the backflush operation of multiple backflush gas paths 5 is completed in sequence. ③ After the backflush operation is completed, the pressure sensor of each backflush gas cylinder 52 transmits the low pressure signal to the controller 7. The controller 7 controls each pressure control valve 51 to pressurize the corresponding backflush gas cylinder 52. Each backflush gas cylinder 52 is pre-pressurized to P2 and then the operation is carried out. During the operation, the gas pressure of the backflush gas cylinder 52 increases as the pressure difference detected by the differential pressure sensor 6 increases. When the detection value of the differential pressure sensor 6 reaches the set maximum gas pressure value P1 of each group of backflush gas paths 5, the controller 7 controls each backflush gas path 5 to carry out the backflush operation in sequence. ④ Since the air pressure in the backflush cylinder 52 changes proportionally to the pressure difference detected by the differential pressure sensor 6, the air pressure in the backflush cylinder 52 corresponds exactly to the degree of blockage in the air filter intake system each time a backflush operation is performed. ⑤ Based on the rate of increase in pressure difference detected by differential pressure sensor 6, combined with environmental monitoring, the frequency of backflushing can be increased.

[0036] Example 2 This utility model provides a tractor in embodiment two, including the air filter backflushing system as described in embodiment one.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An air filter backflushing system, characterized in that, The system includes an air filter (1), an air compressor (2) with its inlet connected to the outlet of the air filter (1), an engine (3) that drives the air compressor (2), an air storage cylinder (4) with its inlet connected to the outlet of the air compressor (2), and at least two sets of parallel backflush air paths (5). Each set of backflush air paths (5) includes a pressure control valve (51) with its inlet connected to the outlet of the air storage cylinder (4), a backflush air cylinder (52) with its inlet connected to the outlet of the pressure control valve (51), and a release valve (53) with its inlet connected to the outlet of the backflush air cylinder (52). The outlet of each release valve (53) is connected to the outlet of the air filter (1).

2. The air filter backflushing system according to claim 1, characterized in that, The pipe connecting the air filter (1) and the air compressor (2) is equipped with a differential pressure sensor (6).

3. The air filter backflushing system according to claim 2, characterized in that, The gas storage cylinder (4) and each of the backflush gas cylinders (52) are equipped with pressure sensors.

4. The air filter backflushing system according to claim 3, characterized in that, The set pressure value of the gas storage cylinder (4) is P, the set maximum pressure value of each group of backflush gas paths (5) is P1, and each backflush gas cylinder (52) is set with a pre-charge pressure value P2. P is greater than P1 and greater than P2. When the pressure value of each backflush gas cylinder (52) reaches P2 and gradually increases, the pressure value of each backflush gas cylinder (52) is proportional to the detection value of the differential pressure sensor (6).

5. The air filter backflushing system according to claim 4, characterized in that, It also includes a controller (7), which is communicatively connected to the air compressor (2), the gas cylinder (4), the pressure control valve (51), the backflush cylinder (52), the release valve (53), and the differential pressure sensor (6).

6. The air filter backflushing system according to claim 5, characterized in that, The outlet of the gas cylinder (4) is also connected to other pneumatic systems (8), and the set pressure value of the gas cylinder (4) is equal to the working pressure value of other pneumatic systems (8).

7. The air filter backflushing system according to claim 1, characterized in that, A cooling device (21) is provided in the pipeline connecting the air outlet of the air compressor (2) and the air inlet of the air storage bottle (4).

8. The air filter backflushing system according to claim 7, characterized in that, A dryer (22) is provided in the pipeline connecting the cooling device (21) and the air inlet of the gas storage cylinder (4).

9. An air filter backflushing system according to any one of claims 1-8, characterized in that, The backflush air passage (5) has two sets connected in parallel.

10. A tractor, characterized in that, Includes the air filter backflushing system as described in any one of claims 1-9.

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