Full-flow-section efficient no-clean oil bath type prefilter and control method thereof

Abstract

The invention discloses a full-flow-section efficient no-clean oil bath type prefilter which comprises a prefilter body, the prefilter body is a shell internally provided with a hollow cavity, an upper filter element and a lower filter element are arranged in the middle of the shell, and the hollow cavity in the shell is divided into an upper air outlet cavity and a lower air inlet cavity through the upper filter element and the lower filter element; the upper filter element and the lower filter element are oil bath spraying chambers, spraying discs are arranged in the oil bath spraying chambers, an oil outlet is formed in the bottom of the lower air inlet cavity, an air inlet reflecting cover covers the oil outlet, an air outlet is formed in the side face of the upper air outlet cavity, an air inlet of the prefilter body is an air inlet pipe, and the upper end of the air inlet pipe is located outside the prefilter body. By means of a spraying system formed by the prefilter body, the service life of the oil bath filter element can be greatly prolonged, the cleaning effect is judged according to the resistance degradation coefficient, a cleaning execution scheme is formulated, and the filter element is free of maintenance in the life cycle.

Description

Technical Field

[0001] The invention relates to the field of filtering devices, and in particular to a control method for a full-flow section high-efficiency, cleaning-free oil bath pre-filter. Background Art

[0002] An oil-bath air pre-filter is used for pre-filtration of the intake system, achieving an ideal pre-filtration efficiency of up to 90%. From bottom to top, the interior of an oil-bath air pre-filter consists of an oil pan that holds the oil, and upper and lower metal filters. When the engine is started, air enters the oil-bath air pre-filter through the intake port. Through the central intake duct, the air contacts the oil surface of the oil pan before returning to the lower filter element. The oil attached to the lower filter element absorbs dust, while the clean air, laden with oil, continues upward through the upper filter element, which removes excess oil from the air. However, when the intake flow is low, the lower filter element has less oil attached to it, resulting in less contact between the air and the filtered oil. This prevents adequate dust absorption and reduces filtration efficiency.

[0003] Air enters the oil bath air pre-cleaner from the air intake, and comes into contact with the oil surface of the oil pan through the central air intake duct before returning to the lower filter element. The air blows up the oil in the oil pan and attaches it to the lower filter element. The oil attached to the lower filter element absorbs the dust, and the clean air with oil continues to pass upward through the upper filter element, which is responsible for retaining excess oil in the air.

[0004] The shortcomings of the existing technology are as follows: 1. Because the air flow required for idle and maximum engine speeds differs significantly, when the intake air flow is low, the airflow and oil are not in sufficient contact, and sufficient oil cannot be blown up. This results in a low oil adhesion rate in the lower filter element, which is unable to remove much dust and has low filtration efficiency. 2. Because the initial intake system resistance of the oil bath filter is relatively high, generally ≥3kPa, and the final alarm pressure is 6.2kPa, when dust adheres to the lower filter element, the intake resistance increases rapidly, reaching the intake system resistance limit in a short period of time, requiring shutdown for filter cleaning or replacement. Furthermore, oil adhered to the metal mesh filter element for a long time is difficult to clean, and direct replacement is costly. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a full-flow range high-efficiency and cleaning-free oil bath pre-filter and a control method thereof. On the basis of the traditional oil bath filter, an oil injection chamber is designed for uniformly injecting oil; the filtration efficiency is controlled by the system flow and pressure, and the oil is evenly injected into the filter element through the injection pipe, and the injection amount is adjusted according to the size of the intake resistance to control the oil concentration inside the oil bath filter element, so that the filtration efficiency is in an optimal state; an air reflection cover is added to the oil pan, and the oil pan is only used to store oil and reflect the intake air; unlike conventional oil bath filters, it no longer relies on the intake air to blow up the oil inside the oil pan and reflect it onto the filter element, and the oil adhesion concentration on the filter element is uncontrollable and uneven, and the filtration efficiency varies greatly; a spray system is added to ensure that the oil adhesion rate inside the filter element is always full, and the filtration efficiency is always at the highest level; at the same time, after shutdown, the pressure of the oil injection system is adjusted according to the intake system resistance, the filter element is cleaned, and a maintenance-free effect is achieved, while ensuring that the intake system resistance is always at a low level.

[0006] The filter housing of the present invention is a kind of high-efficiency and no-cleaning oil bath pre-filter, comprising: a pre-filter body, wherein the pre-filter body is provided with a hollow cavity inside, an upper filter element and a lower filter element are provided in the middle of the shell, and the hollow cavity in the shell is divided into an upper air outlet cavity and a lower air inlet cavity by the upper filter element and the lower filter element. The upper filter element and the lower filter element are spaced apart, and the interval between the upper filter element and the lower filter element is an oil bath spray chamber, and the oil bath spray chamber is provided with a spray disk. The bottom of the lower air inlet cavity is provided with an oil outlet, and an air inlet reflector is provided above the oil outlet. The side surface of the upper air outlet cavity is provided with an air outlet, the air inlet of the pre-filter body is an air inlet pipe, the upper end of the air inlet pipe is located outside the pre-filter body, and the lower end passes through the upper air outlet cavity, the upper filter element, the oil bath spray chamber, and the lower filter element in sequence, so that the lower air inlet cavity is connected to the outside through the air inlet pipe, and the lower end of the air inlet pipe is located above the air inlet reflector.

[0007] Furthermore, the top of the air intake reflector is a conical structure, the lower end is a cylindrical structure, and a notch is provided below the cylindrical structure.

[0008] Furthermore, the center of the conical structure at the top of the air intake reflector is located on the same straight line as the center of the air intake pipe.

[0009] Furthermore, an air intake cap is provided at one end of the air intake pipe located outside the pre-filter body, and a filter is provided in the air intake cap.

[0010] Furthermore, through holes for installing the air inlet pipe are provided in the middle of the upper filter element, the spray plate and the lower filter element.

[0011] Furthermore, a circular arc transition is formed between the side surface of the pre-filter body and the upper and lower end surfaces.

[0012] Furthermore, the pre-filter body is a split structure, and the split structures are connected by hinges and quick-release buckles.

[0013] Furthermore, the spray plate includes: a fixed plate and a spray pipe. The fixed plate is a hollow structure. A plurality of the spray pipes are mounted on the fixed plate. The oil inlet of the spray pipe extends out of the pre-filter body.

[0014] Furthermore, it also includes: an oil storage tank, an external filter, an adjustable pressure circulation pump, a pre-filter pressure sensor, an external over-pressure sensor, and an intake air temperature sensor. The oil inlet of the adjustable pressure circulation pump is connected to the oil storage tank through a pipe, and the oil outlet is connected to the spray plate through a pipe; the oil inlet of the external filter is connected to the oil outlet at the bottom of the pre-filter body through a pipe, and the oil outlet is connected to the oil inlet of the oil storage tank through a pipe. The installation position of the oil storage tank and the external filter is lower than the installation position of the pre-filter body. The adjustable pressure circulation pump, the pre-filter pressure sensor, the external over-pressure sensor, and the intake air temperature sensor are connected to the vehicle-mounted controller. The pre-filter pressure sensor is installed in the pre-filter body for detecting whether the lower filter element is blocked. The intake air temperature sensor is installed in the pre-filter body for detecting the intake air temperature. The external over-pressure sensor is installed in the external filter for detecting whether the external filter is blocked. The oil storage tank, the external filter, the adjustable pressure circulation pump, the pre-filter pressure sensor, the external over-pressure sensor, the intake air temperature sensor, the pre-filter body and the vehicle-mounted controller constitute a spray system.

[0015] A control method for a full-flow high-efficiency, no-clean oil bath prefilter. After startup, the vehicle controller monitors the intake resistance through the prefilter pressure sensor, reads the intake temperature through the intake temperature sensor, and reads the engine speed through the vehicle controller. At the same time, the intake resistance values ​​before shutdown and just after startup are used to generate the intake resistance degradation curve for the first 20 times to determine the current degradation coefficient φ. n and degradation coefficient limit φ limit The relationship between them determines the current intake resistance F in With high efficiency filtration intake resistance F min 、F max relationship between; When F in ≥F max , and φ n <φ limit If the cleaning during the last shutdown is judged to be incomplete, the cleaning pressure and time of the adjustable pressure circulation pump will be increased during the next shutdown; When φ n >φ limit Determine that the filter element has reached the end of its service life and needs to be replaced; When F in ≤F min时, judge that the oil concentration in the filter element is insufficient, start the spray system, adjust the spray pressure of the adjustable pressure circulation pump, and make F min <F in <F max, In the best filtration efficiency range, when F in ≥F max , reduce the spray pressure of the adjustable pressure circulation pump, when F in ≤F min , increase the spray pressure of the adjustable pressure circulation pump; When the machine is shut down, F in =0, start the spray system, adjust the adjustable pressure circulation pump to the cleaning pressure, flush the lower filter element, and the cleaning pressure is greater than the spray pressure; When the on-board controller detects that the external filter pressure reaches the limit through the external over-pressure sensor, replace the external filter element.

[0016] The beneficial effects of the present invention are: (1) The filtration efficiency is not affected by the engine speed and intake air flow rate, and the optimal filtration efficiency can be achieved at all gear speeds; the intake system can work at the optimal intake resistance for a long time, which brings great benefits to engine combustion and power output; the conventional oil bath filter metal filter element is difficult to clean and needs to be replaced frequently, but the present invention can greatly extend the service life of the oil bath filter element, and can achieve maintenance-free operation throughout its entire life cycle; (2) Through the oil injection chamber and the air intake reflector, the conventional uncontrollable oil inside the oil pan blown up by air is changed to the filter element oil adhesion concentration which is precisely controllable. At the same time, a rigorous judgment logic is designed to ensure that the filtration efficiency is always in the best state; a filter element spray system is added, and a cleaning execution plan is formulated based on the resistance degradation coefficient to judge the cleaning effect, so that the filter element is maintenance-free during its life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 Schematic diagram of the structure of the spray plate; Figure 3 Schematic diagram of the structure of the air intake reflector; Figure 4 It is a schematic diagram of the partial structure of the spray system; Figure 5 Schematic diagram of the control method flow chart; In the figure: 1. Air inlet pipe; 2. Air outlet; 3. Upper filter element; 4. Oil bath spray chamber; 5. Lower filter element; 6. Lower air inlet cavity; 7. Air inlet reflector; 8. Spray pipe; 9. Fixed plate; 10. Upper air outlet cavity; 11. Air inlet cap. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] like Figure 1-4 As shown, a full-flow section high-efficiency, no-cleaning oil bath pre-filter comprises: a pre-filter body, the pre-filter body being a shell with a hollow cavity inside, an upper filter element 3 and a lower filter element 5 being provided in the middle of the shell, the hollow cavity in the shell being divided into an upper air outlet cavity 10 and a lower air inlet cavity 6 by the upper filter element 3 and the lower filter element 5, the upper filter element 3 and the lower filter element 5 being spaced apart, the interval between the upper filter element 3 and the lower filter element 5 being an oil bath spray chamber 4, and the oil bath spray chamber 4 being provided with Spray plate, the bottom of the lower air inlet cavity 6 is provided with an oil outlet, the cover above the oil outlet is equipped with an air inlet reflector 7, the side of the upper air outlet cavity 10 is provided with an air outlet 2, the air inlet of the pre-filter body is the air inlet pipe 1, the upper end of the air inlet pipe 1 is located outside the pre-filter body, and the lower end passes through the upper air outlet cavity 10, the upper filter element 3, the oil bath spray chamber 4, and the lower filter element 5 in sequence, so that the lower air inlet cavity 6 is connected to the outside through the air inlet pipe 1, and the lower end of the air inlet pipe 1 is located above the air inlet reflector 7.

[0021] like Figure 1 、 3 As shown, the top of the air intake reflector 7 is a conical structure, and the lower end is a cylindrical structure. A notch is provided at the bottom of the cylindrical structure. The intake air enters the lower air intake cavity 6 through the intake pipe 1, so that the incoming gas is blown on the conical structure at the top of the air intake reflector 7, so that the gas flow blown to the top of the air intake reflector 7 is dispersed to the surroundings.

[0022] like Figure 1 As shown, the center of the conical structure at the top of the air intake reflector 7 is located on the same straight line as the center of the air intake pipe 1, so that the gas flow blown to the top of the air intake reflector 7 is evenly dispersed to the surroundings.

[0023] like Figure 1 As shown, the side surface of the pre-filter body and the upper and lower end surfaces form an arc-shaped transition, which can reduce the gas flow resistance in the upper air outlet cavity 10 and the lower air inlet cavity 6 and reduce the occurrence of dead corners.

[0024] like Figure 1 As shown, the pre-filter body is a cylindrical structure, and the side surface and the upper and lower end surfaces form an arc-shaped transition, which can further eliminate the occurrence of gas dead zones.

[0025] like Figure 1 As shown, an air inlet cap 11 is provided at one end of the air inlet pipe 1 outside the pre-filter body. A filter is provided in the air inlet cap 11 to perform coarse filtering on the incoming gas and prevent water from entering.

[0026] like Figure 1 As shown, through holes for installing the air intake pipe 1 are provided in the middle of the upper filter element 3 , the spray plate, and the lower filter element 5 , ensuring the cooperation between the upper filter element 3 , the spray plate, the lower filter element 5 and the air intake pipe 1 .

[0027] like Figure 1 As shown, the pre-filter body is a split structure, which is connected by hinges and quick-release buckles. The opening of the split structure is located on the side of the lower filter element 5 or the oil bath spray chamber 4, which is convenient for the maintenance and replacement of the upper filter element 3, spray plate, and lower filter element 5.

[0028] like Figure 2 As shown, the spray plate includes: a fixed plate 9 and a spray pipe 8. The fixed plate 9 is a hollow structure. Multiple spray pipes 8 are installed on the fixed plate 9. The oil inlet of the spray pipe 8 extends out of the pre-filter body. In this example, the multiple spray pipes 8 are distributed in a circle on the fixed plate 9, and the spray pipe 8 is provided with multiple nozzles or nozzles.

[0029] like Figure 4 As shown, the full-flow high-efficiency, no-cleaning oil bath pre-filter also includes: an oil storage tank, an external filter, an adjustable pressure circulation pump, a pre-filter pressure sensor, an external over-pressure sensor, and an intake air temperature sensor. The oil inlet of the adjustable pressure circulation pump is connected to the oil storage tank through a pipeline, and the oil outlet is connected to the spray plate through a pipeline; the oil inlet of the external filter is connected to the oil outlet at the bottom of the pre-filter body through a pipeline, and the oil outlet is connected to the oil inlet of the oil storage tank through a pipeline. The installation position of the oil storage tank and the external filter is lower than the installation position of the pre-filter body. The adjustable pressure circulation pump, the pre-filter pressure sensor, the external over-pressure sensor, and the intake air temperature sensor are connected to the on-board controller. The pre-filter pressure sensor is installed in the pre-filter body to detect whether the lower filter element 5 is blocked. The intake air temperature sensor is installed in the pre-filter body to detect the intake air temperature. The external over-pressure sensor is installed in the external filter to detect whether the external filter is blocked. The oil storage tank, the external filter, the adjustable pressure circulation pump, the pre-filter pressure sensor, the external over-pressure sensor, the intake air temperature sensor, the pre-filter body and the on-board controller constitute a spray system.

[0030] The on-board controller is the on-board EDU.

[0031] like Figure 5As shown in the figure, a control method for a full-flow high-efficiency, no-cleaning oil bath prefilter is described. After startup, the vehicle controller monitors the intake resistance through the prefilter pressure sensor, reads the intake temperature through the intake temperature sensor, and reads the engine speed through the vehicle controller. At the same time, the intake resistance values ​​before shutdown and just after startup are used to generate the intake resistance degradation curve for the first 20 times to determine the current degradation coefficient φ n and degradation coefficient limit φ limit The relationship between them determines the current intake resistance F in With high efficiency filtration intake resistance F min 、F max relationship between; When F in ≥F max , and φ n <φ limit If the cleaning during the last shutdown is judged to be incomplete, the cleaning pressure and time of the adjustable pressure circulation pump will be increased during the next shutdown; When φ n >φ limit Determine that the filter element has reached the end of its service life and needs to be replaced; When F in ≤F min时 , judge that the oil concentration in the filter element 5 is insufficient, start the spray system, adjust the spray pressure of the adjustable pressure circulation pump, and make F min <F in <F max, In the best filtration efficiency range; when F in ≥F max , reduce the spray pressure of the adjustable pressure circulation pump, when F in ≤F min , increase the spray pressure of the adjustable pressure circulation pump; When the machine is shut down, F in =0, start the spray system, adjust the adjustable pressure circulation pump to the cleaning pressure, and flush the lower filter element 5. The cleaning pressure is greater than the spray pressure; When the on-board controller detects that the external filter pressure reaches the limit through the external over-pressure sensor, replace the external filter element.

[0032] The filter element of the external filter is coarse filtration, with high strength, strong pressure resistance, low cost, and can meet a longer replacement cycle.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A full-flow high-efficiency, no-cleaning oil bath prefilter, characterized in that: include: The pre-filter body is a shell body with a hollow cavity inside, and an upper filter element and a lower filter element are provided in the middle of the shell. The hollow cavity in the shell is divided into an upper air outlet cavity and a lower air inlet cavity by the upper filter element and the lower filter element. The upper filter element and the lower filter element are spaced apart, and the interval between the upper filter element and the lower filter element is an oil bath spray chamber, and a spray disk is provided in the oil bath spray chamber. An oil outlet is provided at the bottom of the lower air inlet cavity, and an air intake reflector is provided above the oil outlet. An air outlet is provided on the side of the upper air outlet cavity, and the air inlet of the pre-filter body is an air inlet pipe. The upper end of the air inlet pipe is located outside the pre-filter body, and the lower end passes through the upper air outlet cavity, the upper filter element, the oil bath spray chamber, and the lower filter element in sequence, so that the lower air inlet cavity is connected to the outside through the air inlet pipe, and the lower end of the air inlet pipe is located above the air intake reflector.

2. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: The top of the air intake reflector is a conical structure, the lower end is a cylindrical structure, and a notch is provided below the cylindrical structure.

3. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 2, characterized in that: The center of the conical structure at the top of the air intake reflector is located on the same straight line as the center of the air intake pipe.

4. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: An air intake cap is provided at one end of the air intake pipe located outside the pre-filter body, and a filter screen is provided in the air intake cap.

5. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: The upper filter element, the spray plate and the lower filter element are all provided with through holes for installing the air inlet pipe in the middle.

6. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: A circular arc transition is formed between the side surface of the pre-filter body and the upper and lower end surfaces.

7. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: The pre-filter body is a split structure, and the split structures are connected by hinges and quick-release buckles.

8. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: The spray plate includes: a fixed plate and a spray pipe. The fixed plate is a hollow structure. A plurality of the spray pipes are installed on the fixed plate. The oil inlet of the spray pipe extends out of the pre-filter body.

9. The full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 1, characterized in that: Also includes: The oil storage tank, external filter, adjustable pressure circulation pump, pre-filter pressure sensor, external over-pressure sensor, intake air temperature sensor, the oil inlet of the adjustable pressure circulation pump is connected to the oil storage tank through a pipe, and the oil outlet is connected to the spray plate through a pipe; the oil inlet of the external filter is connected to the oil outlet at the bottom of the pre-filter body through a pipe, and the oil outlet is connected to the oil inlet of the oil storage tank through a pipe. The installation position of the oil storage tank and the external filter is lower than the installation position of the pre-filter body, the adjustable pressure circulation pump, pre-filter pressure sensor, external over-pressure sensor, and intake air temperature sensor are connected to the on-board controller, the pre-filter pressure sensor is installed in the pre-filter body for detecting whether the lower filter element is blocked, the intake air temperature sensor is installed in the pre-filter body for detecting the intake air temperature, the external over-pressure sensor is installed in the external filter for detecting whether the external filter is blocked, the oil storage tank, external filter, adjustable pressure circulation pump, pre-filter pressure sensor, external over-pressure sensor, intake air temperature sensor, pre-filter body and on-board controller constitute a spray system.

10. The control method of a full-flow high-efficiency, no-cleaning oil bath prefilter according to claim 9, characterized in that: After starting up, the on-board controller monitors the intake resistance through the pre-filter pressure sensor, reads the intake temperature through the intake temperature sensor, and reads the engine speed through the on-board controller. At the same time, the intake resistance values ​​before shutdown and just after startup generate the intake resistance degradation curve for the first 20 times to determine the current degradation coefficient φ n and degradation coefficient limit φ limit The relationship between them determines the current intake resistance F in With high efficiency filtration intake resistance F min 、F max relationship between; When F in ≥F max , and φ n <φ limit If the cleaning during the last shutdown is judged to be incomplete, the cleaning pressure and time of the adjustable pressure circulation pump will be increased during the next shutdown; When φ n >φ limit Determine that the filter element has reached the end of its service life and needs to be replaced; When F in ≤F min时 , judge that the oil concentration in the filter element is insufficient, start the spray system, adjust the spray pressure of the adjustable pressure circulation pump, and make F min <F in <F max, In the best filtration efficiency range, when F in ≥F max , reduce the spray pressure of the adjustable pressure circulation pump, when F in ≤F min , increase the spray pressure of the adjustable pressure circulation pump; When the machine is shut down, F in =0, start the spray system, adjust the adjustable pressure circulation pump to the cleaning pressure, flush the lower filter element, and the cleaning pressure is greater than the spray pressure; When the on-board controller detects that the external filter pressure reaches the limit through the external over-pressure sensor, replace the external filter element.

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