Air inlet filtering system for large-tonnage excavator in dusty environment

Abstract

The utility model provides an air inlet filtering system for a large-tonnage excavator in a dusty environment, which relates to the technical field of engine equipment and comprises a multi-stage prefilter, a prefilter bracket, a first connecting pipe, a main air filter, an air filter bracket, a second connecting pipe and a hoop, the multi-stage prefilter is fixed on the prefilter bracket and is communicated with the main air filter through a first connecting pipe; the main air filter is fixed to the air filter support, and an air outlet of the main air filter is connected with the engine through a second connecting pipe. Through the four-stage series connection structure of the cyclone pipe, the coarse filter element, the main filter element and the safety filter element, the filtering efficiency is effectively improved, the amount of dust entering the main air filter is reduced, the maintenance period of the main filter element is prolonged, and the working performance of a large-tonnage excavator in a dusty environment is remarkably optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to engine equipment technical field, especially under the big tonnage excavator of many dust environment with air intake filter system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute the prior art.

[0003] In some mines, quarries, cement plants and other heavy dust construction sites, in order to ensure the maintenance cycle of the air filter element, the construction equipment is equipped with different pre-filter systems such as cyclone pre-filter, oil bath pre-filter and automatic backflushing pre-filter before the air filter. In order to ensure the attendance rate and oil consumption of the excavator, the excavator driver is required to clean the pre-filter and air filter during shift change. Frequent cleaning can cause the air filter element to fail prematurely, and the engine is at risk of early wear.

[0004] In the prior art, the cyclone pre-filter has been gradually eliminated due to its limited filtering efficiency; the single oil bath pre-filter for large equipment is maintained frequently, the weight of the oil basin can reach 20-30 kg, which is heavy and difficult to clean the bottom mud; the cost of two oil filters is high, and the mud is also difficult to clean; the automatic backflushing pre-filter requires electrical control module, air pump, air cylinder and other components, which is high in cost and high in reliability risk. INVENTION CONTENTS

[0005] The utility model discloses a kind of air intake filter systems of big tonnage excavator under many dust environment, with the advantages of high filtering efficiency, easy maintenance, low cost, high reliability. The air intake filter system of big tonnage excavator under many dust environment, including multistage pre-filter (1), pre-filter support (2), first connecting pipe (3), main air filter (4), air filter support (5), second connecting pipe (6) and clamp (7);

[0006] The multistage pre-filter (1) is fixed on the pre-filter support (2), and is communicated with the main air filter (4) by the first connecting pipe (3);

[0007] The main air filter (4) is fixed on the air filter support (5), and the air outlet is connected with the engine (9) by the second connecting pipe (6).

[0008] Further, the multi-stage pre-filter (1) comprises a protective cover (1.1), a cyclone tube assembly (1.2), a coarse filter element (1.3), a first shell (1.4), a first end cover (1.5) and an ash collecting basin (1.6), the cyclone tube assembly (1.2) is vertically arranged in the first shell (1.4), the bottom of the cyclone tube assembly (1.2) is communicated with the ash collecting basin (1.6), and the top of the cyclone tube assembly (1.2) is connected with the coarse filter element (1.3) through a pipeline, and the coarse filter element (1.3) is transversely arranged in the first shell (1.4) and is sealed by the first end cover (1.5).

[0009] Further, the cyclone tube assembly (1.2) is composed of a plurality of cyclone tubes, the cyclone tubes are located in the protective cover (1.1), air can pass through the protective cover (1.1) to the outlet end of the cyclone tube assembly (1.2) without obstruction, and the air is aligned with the air inlet of the coarse filter element (1.3).

[0010] Further, the ash collecting basin (1.6) is a detachable basin structure and is fixed to the bottom of the first shell (1.4) through buckle connection.

[0011] Further, the main air filter (4) comprises a main filter element (4.1), a safety filter element (4.2), a second shell (4.4) and a second end cover (4.3), the main filter element (4.1) and the safety filter element (4.2) are coaxially nested in the second shell (4.4), and the second end cover (4.3) is fixed to the top of the second shell (4.4) through buckle connection.

[0012] Further, the main filter element (4.1) and the coarse filter element (1.3) have consistent interface sizes and are both cylindrical structures.

[0013] Further, one end of the first connecting pipeline (3) is fixed to the air outlet of the multi-stage pre-filter (1), and the other end is connected with the air inlet of the main air filter (4).

[0014] Further, the differential pressure sensor (8) is fixed to the air outlet shell of the main air filter (4).

[0015] Compared with the prior art, the air inlet filter system for the large-tonnage excavator in a dusty environment provided by the utility model has the following beneficial effects:

[0016] (1) The four-stage series structure of the cyclone tube, the coarse filter element, the main filter element and the safety filter element effectively improves the filtering efficiency, reduces the amount of dust entering the main air filter, prolongs the maintenance period of the main filter element, and the maintenance period of the main filter element is synchronized with the oil filter element. Even if the coarse filter element is damaged during cleaning, the main filter element and the safety filter element can still intercept the remaining dust, avoiding the early grinding caused by the suction of particles into the engine, significantly reducing the wear risk of the engine caused by dust, and improving the equipment attendance rate and service life.

[0017] (2)The ash collecting basin adopts a detachable basin structure (buckle), and can be quickly cleaned without disassembling other components.

[0018] (3)The coarse filter element and the main filter element have consistent interface sizes, so that the coarse filter element can be directly replaced by the eliminated main filter element, and the spare part cost is reduced.

[0019] (4)The differential pressure sensor is arranged, so that the blockage of the air filter can be monitored in real time, the driver is reminded to maintain in time, and the insufficient air intake of the engine caused by the blockage of the filter element and the high oil consumption are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of the present disclosure, are used to provide further understanding of the present disclosure, and the illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute improper limitations on the present disclosure.

[0021] Figure 1 A structure schematic view of the air inlet filtering system is provided in the utility model;

[0022] Figure 2 An enlarged schematic view of the cyclone pipe structure is provided in the utility model;

[0023] Figure 3 A structure schematic view of the differential pressure sensor is provided in the utility model.

[0024] In the figure, 1 is a multi-stage pre-filter, 2 is a pre-filter support, 3 is a first connecting pipe, 4 is a main air filter, 5 is an air filter support, 6 is a second connecting pipe, 7 is a clamp, 8 is a differential pressure sensor, 9 is an engine, 1.1 is a protective cover, 1.2 is a cyclone pipe assembly, 1.3 is a coarse filter element, 1.4 is a first shell, 1.5 is a first end cover, 1.6 is an ash collecting basin, 4.1 is a main filter element, 4.2 is a safety filter element, 4.3 is a second end cover, and 4.4 is a second shell. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments only represent some of the embodiments of the utility model, rather than all the embodiments.

[0026] As Figure 1 the utility model provides a kind of air inlet filtering system of large-tonnage excavator under multi-dust environment, including multi-stage pre-filter (1), pre-filter support (2), first connecting pipe (3), main air filter (4), air filter support (5), second connecting pipe (6) and clamp (7);

[0027] The pre-filter support (2), the first connecting pipe (3), the air filter support (5), and the second connecting pipe (6) are not limited to Figure 1 The structure shown in the specification can be realized by various transformations. Figure 1 In the specification, the pre-filter support adopts an angle steel welded frame structure, the first connecting pipe and the second connecting pipe contain rubber pipes and stainless steel pipes, both of which are fixed by a clamp, or only contain rubber pipes; and the air filter support adopts a clamp structure.

[0028] The multi-stage pre-filter (1) is fixed on the pre-filter support (2) and communicates with the main air filter (4) through the first connecting pipe (3).

[0029] The main air filter (4) is fixed on the air filter support (5), and its air outlet is connected with the engine (9) through the second connecting pipe (6).

[0030] The connection between the connecting pipes and the connection between the connecting pipes and the engine air inlet are realized by the clamp (7).

[0031] The multi-stage pre-filter (1) comprises a protective cover (1.1), a cyclone pipe assembly (1.2), a coarse filter element (1.3), a first shell (1.4), a first end cover (1.5), and a dust collecting basin (1.6). The cyclone pipe assembly (1.2) is vertically arranged inside the first shell (1.4), the bottom of which communicates with the dust collecting basin (1.6), and the top of which is connected with the coarse filter element (1.3) through a pipeline. The coarse filter element (1.3) is transversely installed in the first shell (1.4) and is closed by the first end cover (1.5).

[0032] As shown in Figure 2 The cyclone pipe assembly (1.2) is composed of a plurality of cyclone pipes, and the cyclone pipe assembly (1.2) is located in the protective cover (1.1). An air inlet hole is arranged on the protective cover (1.1), so that air can pass through the protective cover (1.1) into the outlet end of the cyclone pipe assembly (1.2) without obstruction, and align with the air inlet of the coarse filter element (1.3). The cyclone pipe assembly (1.2) utilizes centrifugal force to realize preliminary and efficient separation, thereby reducing the load of subsequent filter elements.

[0033] The dust collecting basin (1.6) is a detachable basin structure, which is fixed to the bottom of the first shell (1.4) by a buckle connection, and can be quickly cleaned without disassembling other components.

[0034] The main air filter (4) comprises a main filter element (4.1), a safety filter element (4.2), a second shell (4.4), and a second end cover (4.3). The main filter element (4.1) and the safety filter element (4.2) are coaxially nested and installed in the second shell (4.4). The second end cover (4.3) is fixed to the top of the second shell (4.4) by a buckle.

[0035] In the system, 80%-95% of dusts fall into the dust collecting basin (1.6) through the cyclone tube, 98%-99% of the remaining dusts are intercepted by the coarse filter element (1.3), and the rest of the dusts are intercepted by the main filter element (4.1); as the amount of dusts reaching the main filter element (4.1) is less than 1% of the total amount of dusts, the maintenance cycle of the main filter element can be achieved at the same frequency as the oil filter and diesel filter, thereby reducing the downtime.

[0036] The interface size of the main filter element (4.1) and the coarse filter element (1.3) is consistent, and both are cylindrical structures. The interface of the coarse filter element and the main filter element is universal, thereby reducing the cost of spare parts.

[0037] One end of the first connecting pipe (3) is fixed to the air outlet of the multi-stage pre-filter (1), and the other end is connected to the air inlet of the main air filter (4).

[0038] The filtering system composed of the cyclone tube assembly (1.2), the coarse filter element (1.3), the main filter element (4.1) and the safety filter element (4.2) constitutes a total four-stage air inlet filtering system, and by optimizing the size and number of the cyclone tube assembly (1.2) and the filtering precision of the coarse filter element (1.3), lower original resistance can be achieved, and the economic fuel consumption of the engine is ensured.

[0039] As Figure 3 The differential pressure sensor (8) is fixed to the air outlet housing of the main air filter (4). The differential pressure sensor can monitor the blockage of the air filter in real time, remind the driver to maintain in time, and avoid the engine from being insufficient in air intake and the fuel consumption from being increased due to the blockage of the filter element.

[0040] The working principle of the utility model is as follows:

[0041] The air inlet filtering system provided by the utility model separates and intercepts dusts in air step by step through a multi-stage physical filtering structure, and finally provides clean air for the engine, and the working principle can be divided into the following four stages:

[0042] 1. The first stage: cyclone tube centrifugal separation (coarse filtering)

[0043] The external dust-containing air first enters the cyclone tube assembly (1.2) through the protective cover (1.1). The cyclone tube is a tubular structure arranged vertically, and air flows at high speed along a spiral path in the cyclone tube.

[0044] Due to the special design of the cyclone tube (such as decreasing diameter and inclined angle of the tube wall), large-particle dusts in the air are thrown to the tube wall under the action of centrifugal force and fall into the dust collecting basin (1.6) along the tube wall.

[0045] The first stage can intercept 80%-95% of large-particle dusts in air, thereby significantly reducing the load of subsequent filter elements.

[0046] 2. Second stage: coarse filter interception (medium efficiency filtration)

[0047] The air preliminarily purified by the cyclone tube flows upward into the coarse filter core (1.3). The coarse filter core is usually a cylindrical structure of synthetic fiber or paper material, which is installed transversely in the interior of the shell.

[0048] When the air passes through the coarse filter core, the remaining medium-sized dust particles are intercepted by the pores or fibers on the surface of the filter material. Some dust particles may be embedded in the interior of the filter material to form a filter layer, further improving the interception efficiency.

[0049] The coarse filter core can intercept 98%-99% of the remaining dust that has not been treated by the cyclone tube, and only allow a small amount of fine particles to enter the next stage.

[0050] 3. Third stage: main filter core fine filtration (high efficiency filtration)

[0051] The air enters the main air filter (4) through the connecting pipe (3) and first passes through the main filter core (4.1). The main filter core is usually a high-precision paper or synthetic fiber material, which is consistent with the interface size of the coarse filter core. The micron-level pores of the main filter core can capture fine dust particles that have not been intercepted by the coarse filter core. The multi-layer filter material structure ensures that dust is deposited step by step to avoid blockage.

[0052] The main filter core can filter more than 99.9% of the remaining dust, ensuring that the air entering the engine meets the cleanliness requirements.

[0053] 4. Fourth stage: safety filter core redundant protection (emergency filtration)

[0054] Behind the main filter core, a safety filter core (4.2) is provided, which is coaxially nested with the main filter core. When the main filter core is accidentally damaged or reaches the end of its life, the safety filter core serves as a backup barrier.

[0055] The filtration accuracy of the safety filter core is consistent with that of the main filter core, but it only comes into play when the main filter core fails to prevent dust from directly entering the engine.

[0056] The system reduces the dust content in the air through the four-stage physical filtration process of centrifugal separation, coarse interception, fine filtration, and redundant protection, with high reliability.

[0057] In the description of the present specification, the terms "connection", "installation", "fixation", "provision", and the like are broadly understood, for example, "connection" can be fixed connection or indirectly through intermediate components without affecting the relationship between components and technical effects, or it can be integrated connection or partial connection, such as the case for a person of ordinary skill in the art, the specific meaning of the above terms in the utility model or utility model can be understood according to the specific circumstances.

[0058] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A large-tonnage excavator air intake filter system in a dusty environment, characterized by, The multi-stage pre-filter (1), the pre-filter support (2), the first connecting pipe (3), the main air filter (4), the air filter support (5), the second connecting pipe (6) and the clamp (7) are included. The multi-stage pre-filter (1) is fixed on the pre-filter support (2) and communicates with the main air filter (4) through the first connecting pipe (3). The multi-stage pre-filter (1) includes a protective cover (1.1), a cyclone pipe assembly (1.2), a coarse filter element (1.3), a first housing (1.4), a first end cover (1.5) and a dust collecting basin (1.6), the cyclone pipe assembly (1.2) is vertically arranged inside the first housing (1.4), the bottom thereof communicates with the dust collecting basin (1.6), and the top thereof is connected with the coarse filter element (1.3) through a pipeline, the coarse filter element (1.3) is transversely installed in the first housing (1.4) and is closed through the first end cover (1.5), The main air filter (4) is fixed on the air filter support (5), and the air outlet thereof is connected with the engine (9) through the second connecting pipe (6).

2. The large tonnage excavator air intake filtration system under dusty environment of claim 1, wherein, The cyclone pipe assembly (1.2) is composed of a plurality of cyclone pipes, the cyclone pipes are located in the protective cover (1.1), the protective cover (1.1) is provided with an air inlet hole, and the outlet end of the cyclone pipe assembly (1.2) is aligned with the air inlet of the coarse filter element (1.3).

3. The large tonnage excavator air intake filtration system of claim 1, wherein, The dust collecting basin (1.6) is a detachable basin structure and is fixed to the bottom of the first housing (1.4) through a buckle connection.

4. The large tonnage excavator air intake filtration system of claim 1, wherein, The main air filter (4) includes a main filter element (4.1), a safety filter element (4.2), a second housing (4.4) and a second end cover (4.3), the main filter element (4.1) and the safety filter element (4.2) are coaxially nested and installed in the second housing (4.4), and the second end cover (4.3) is fixed to the top of the second housing (4.4) through a buckle.

5. The large tonnage excavator air intake filtration system of claim 4, wherein, The interface size of the main filter element (4.1) is consistent with that of the coarse filter element (1.3), and both are cylindrical structures.

6. The large tonnage excavator air intake filtration system of claim 1, wherein, One end of the first connecting pipe (3) is fixed to the air outlet of the multi-stage pre-filter (1), and the other end is connected with the air inlet of the main air filter (4).

7. The large tonnage excavator air intake filtration system of claim 1, wherein, A differential pressure sensor (8) is further included, and the differential pressure sensor (8) is fixed to the air outlet housing of the main air filter (4).

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