A double-pass intake cap

Abstract

The present invention discloses a double-pass intake cap, belonging to the technical field of engine intake systems. Its components include an intake cap housing, a central air pipe, and a straight-through swirl pipe. Among them, one end of the intake cap housing is the intake end, and the other end is the outlet end. The intake end is provided with intake holes for allowing air to enter the internal cavity of the intake cap housing. The central air pipe is sleeved inside the intake cap housing, and the air passage of the central air pipe has two states: being connected and closed to the intake end of the intake cap housing. One or more straight-through swirl pipes are fixedly installed on the outer peripheral side of the central air pipe, and the intake port of each straight-through swirl pipe is connected to the intake end of the intake cap housing, and the dust discharge passage of each straight-through swirl pipe is connected to the outside atmosphere. The outlet ports of the central air pipe and the straight-through swirl pipes are both connected to the outlet end of the intake cap housing. This double-pass intake cap has the advantages of simple and compact structure and can improve the intake efficiency of the engine.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine intake systems, and particularly relates to a double-pass intake cap. Background Art

[0002] In agricultural machinery represented by cotton pickers and construction machinery represented by mining machinery, when the vehicle is in use, it will disturb the ground dust and environmental impurities, making the content of air dust and impurities in the engine intake very large. As a result, the air inhaled by the engine contains a large amount of dust, crop branches and leaves and other large-size, light impurities. After these impurities enter the engine intake passage, they will be intercepted by the air filter.

[0003] However, these impurities often cause the air filter to become clogged, requiring frequent maintenance of the air filter. For example, when a cotton harvester is working, the air filter element needs to be cleaned every about two hours. Therefore, it is very urgent to develop an anti-clogging air pre-filter. Summary of the Invention

[0004] In view of this, the present invention provides a double-pass intake cap. When there are relatively many impurities in the air, the air will flow through the straight-through cyclone tube, and then the impurities will be discharged to the outside atmosphere through the dust discharge channel of the straight-through cyclone tube by centrifugal force. When there are relatively few impurities in the air, the air will pass through two paths, namely the straight-through cyclone tube and the central air pipe, greatly reducing the intake resistance.

[0005] The present invention adopts the following technical solutions:

[0006] A double-pass intake cap, comprising an intake cap housing, a central air pipe and a straight-through cyclone tube;

[0007] One end of the intake cap housing is an intake end, and the other end is an outlet end; the intake end is provided with an intake hole for allowing air to enter the internal cavity of the intake cap housing;

[0008] The central air pipe is sleeved inside the intake cap housing, and the air passage of the central air pipe has two states of being communicated with and closed to the intake end of the intake cap housing;

[0009] One or more of the straight-through cyclone tubes are fixedly installed on the outer peripheral side of the central air pipe, and the intake port of each straight-through cyclone tube is communicated with the intake end of the intake cap housing, and the dust discharge channel of each straight-through cyclone tube is communicated with the outside atmosphere;

[0010] The outlet ends of the central air pipe and the straight-through cyclone tube are both communicated with the outlet end of the intake cap housing.

[0011] Furthermore, a baffle is provided at the air inlet of the central air pipe. By moving the baffle, the air inlet of the central air pipe can be opened or closed, so that the air passage of the central air pipe is communicated with or closed to the air inlet end of the air inlet cap housing.

[0012] Furthermore, the central air pipe makes the air passage of the central air pipe communicate with or close to the air inlet end of the air inlet cap housing by shortening and extending axially inside the air inlet cap housing.

[0013] Furthermore, the straight-through cyclone tube includes an air inlet pipe, an air outlet pipe and swirl vanes which are coaxially sleeved;

[0014] The top end of the air inlet pipe is hermetically connected to an air inlet panel arranged inside the air inlet cap housing;

[0015] The top end of the air outlet pipe is accommodated inside the bottom end of the air inlet pipe, and the bottom end of the air outlet pipe extends out of the air inlet pipe and is hermetically connected to an air outlet panel arranged inside the air inlet cap housing; the circumferential gap between the air inlet pipe and the air outlet pipe is a dust discharge channel;

[0016] The swirl vanes are fixedly arranged inside the upper end of the air inlet pipe.

[0017] Furthermore, the swirl vanes include a central shaft and a vane body with a spiral curved surface;

[0018] The axis of the central shaft coincides with the axis of the air inlet pipe, and the vane body is located between the air inlet pipe and the central shaft.

[0019] Furthermore, both ends of the central shaft are hemispheres.

[0020] Furthermore, the thickness of the vane body gradually decreases radially outward along the air inlet pipe.

[0021] Furthermore, the effective channel size of the blades of the straight-through cyclone tube is greater than 30 mm.

[0022] Furthermore, the double-pass air inlet cap further includes a central rod;

[0023] One end of the central rod is fixedly connected to the central air pipe, and the other end extends upward through the top of the air inlet cap housing and can be lifted and lowered;

[0024] When the central rod is lifted, the central air pipe extends and abuts against the air inlet cap housing, so that the air passage of the central air pipe is in a closed state with the air inlet end of the air inlet cap housing; when the central rod is lowered, the central air pipe shortens and separates from the air inlet cap housing, so that the air passage of the central air pipe is communicated with the air inlet end of the air inlet cap housing.

[0025] Furthermore, the double-pass intake cap further includes a dust collection chamber communicating with the dust discharge channels of each of the dust collection chambers;

[0026] The dust collection chamber is disposed at the bottom of the intake cap housing, and a dust discharge nozzle is provided at the dust discharge port of the dust collection chamber.

[0027] Advantageous effects:

[0028] 1. For the double-pass intake cap of the present invention, the straight-through cyclone tube is arranged on the outer peripheral side of the central air tube. When there are relatively many impurities in the air, the air passage of the central air tube can be closed, so that the air entering from the air inlet of the intake cap only flows through the straight-through cyclone tube, and thus the impurities in the air are discharged into the external atmosphere through the dust discharge channel of the straight-through cyclone tube by means of centrifugal force; when there are relatively few impurities in the air, the air passage of the central air tube is opened, so that the air entering from the air inlet of the intake cap is divided into two paths, one path flows through the straight-through cyclone tube, and the other path flows through the central air tube and finally converges to flow into the next-stage filtering device of the engine intake system. When the air flows through the engine intake cap from two paths, the flow area of the air flow is increased, the intake resistance is reduced, the power performance of the vehicle in a good intake environment is improved, and at the same time, the fuel consumption of the engine is reduced.

[0029] 2. For the double-pass intake cap of the present invention, the air passage of the central air tube can be communicated with or closed to the intake end of the intake cap housing in the form of a partition member, and the structure is simple and compact.

[0030] 3. For the double-pass intake cap of the present invention, the air passage of the central air tube can be communicated with or closed to the intake end of the intake cap housing by shortening and extending the central air tube axially inside the intake cap housing, and the structure is simple and compact.

[0031] 4. For the double-pass intake cap of the present invention, both ends of the central axis of the swirl vane are designed as hemispherical structures, and the thickness of the vane body gradually decreases radially outward along the intake pipe, which can reduce the air flow resistance, and further improve the purification efficiency of the straight-through cyclone tube in the intake cap for the impurities in the inhaled air, and also improve the engine intake efficiency.

[0032] 5. For the double-pass intake cap of the present invention, making the effective channel size of the vane of the straight-through cyclone tube greater than 30 mm can ensure that the straight-through cyclone tube is not blocked in the environment of cotton picking operation.

[0033] 6. For the double-pass intake cap of the present invention, when the central rod is lifted, the central air pipe extends and abuts against the intake cap housing. The air passage of the central air pipe is closed and not connected to the intake end of the intake cap housing, and air flows in through the intake holes of the intake cap housing and only passes through the straight-through swirl tube. When the central rod is lowered, the central air pipe shortens and separates from the intake cap housing, enabling the air passage of the central air pipe to communicate with the intake end of the intake cap housing. Air flows in through the intake holes of the intake cap housing, one way through the straight-through swirl tube and the other way through the central air pipe, and converges at the bottom of the intake cap housing to flow into the next-stage filter of the engine intake system. The adjustment operation of the opening and closing state of the air flow passage of the central air pipe is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a schematic diagram of the working principle of the double-pass intake cap of the present invention when the air passage of the central air pipe is in a communicating state with the intake end of the intake cap housing;

[0035] Figure 2 FIG. is a schematic diagram of the working principle of the double-pass intake cap of the present invention when the air passage of the central air pipe is in a closed state with the intake end of the intake cap housing;

[0036] Figure 3 is Figure 1 a three-dimensional structural diagram of the straight-through swirl tube in;

[0037] Figure 4 is Figure 3 a schematic diagram of the working principle of the straight-through swirl tube in;

[0038] Wherein, 1 - dust-proof cover, 2 - intake cap housing, 3 - central air pipe, 4 - straight-through swirl tube, 5 - dust collection chamber, 6 - dust discharge duckbill, 7 - central rod, 8 - air inlet panel, 9 - air outlet panel, 10 - intake pipe, 11 - outlet pipe, 12 - central axis, 13 - swirl vane, 14 - intake hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0040] Example 1:

[0041] As Figures 1 - 4 shown, a double-pass engine intake cap includes an intake cap housing 2, a central air pipe 3, and a straight-through swirl tube 4; wherein:

[0042] One end of the intake cap housing 2 is the intake end, and the other end is the outlet end. The intake end is provided with intake holes for allowing air to enter the internal cavity of the intake cap housing 2;

[0043] The central air pipe 3 is sleeved inside the air inlet cap housing 2 through the air inlet panel 8 and the air outlet panel 9 inside the air inlet cap housing 2 (where the air inlet panel 8 is located below the meshed air inlet holes 14, and the area above the air inlet panel 8 inside the air inlet cap housing 2 is the air inlet end). Moreover, the air passage of the central air pipe 3 has two states of being connected and closed to the air inlet end of the air inlet cap housing 2. For example, Figure 1 , in the open state, the air coming in from the air inlet holes 14 of the air inlet cap housing 2 can flow through the central air pipe 3. For example, Figure 2 , in the closed state, the air coming in from the air inlet holes 14 of the air inlet cap housing 2 cannot flow through the central air pipe 3;

[0044] Eight straight-through swirl pipes 4 are fixedly installed at equal intervals in the circumferential direction on the outer peripheral side of the central air pipe 3 (the axial two ends of the straight-through swirl pipes 4 are respectively supported on the air inlet panel 8 and the air outlet panel 9). Moreover, the air inlet of each straight-through swirl pipe 4 is connected to the air inlet end of the air inlet cap housing 2, and the dust discharge channel of each straight-through swirl pipe 4 (the circumferential gap between the air inlet pipe 10 and the air outlet pipe 11 is the dust discharge channel) is connected to the outside atmosphere. In this way, another path of air is formed. In this embodiment, the axis of the straight-through swirl pipe 4 is parallel to the axis of the central air pipe 3;

[0045] Moreover, the air outlet of the central air pipe 3 and the straight-through swirl pipes 4 are both connected to the air outlet end of the air inlet cap housing 2.

[0046] As an improvement, the dust-proof cover 1 is fixedly installed on the top of the air inlet cap housing 2, which can prevent rainwater or sundries from directly entering the air inlet cap. The dust collection chamber 5 is arranged at the bottom of the air inlet cap housing 2 and is connected to the dust discharge channel of each straight-through swirl pipe 4, and is used for collecting impurities in the air flowing through the straight-through swirl pipes 4. The dust discharge duckbill 6 is installed at the dust discharge port of the dust collection chamber 5. The dust discharge duckbill 6 can use the intake pulse of the engine to discharge the impurities collected in the dust collection chamber 5 from the dust discharge port of the dust collection chamber 5. Of course, in addition to using the dust discharge duckbill 6, other dust discharge parts can also be used, and other dust discharge methods can be adopted, such as connecting the dust discharge port of the dust collection chamber 5 to a dust extraction pump through a rubber hose for dust discharge; or using the method of waste ejection, connecting the dust discharge port of the dust collection chamber 5 to the exhaust pipe of the engine, and the negative pressure generated at the dust discharge port by the exhaust pipe during the engine exhaust will extract the impurities collected in the dust collection chamber 5 and discharge them along with the engine exhaust gas. When necessary, the dust discharge duckbill 6 can be manually removed, and then the impurities collected in the dust collection chamber 5 can be cleaned.

[0047] Specifically, the central air pipe 3 can be shortened and elongated through a structure similar to the contraction of a retractable antenna rod, so as to connect or close the air passage of the central air pipe 3 with the air inlet end of the air inlet cap housing 2. Refer to Figure 1 and Figure 2, one end of the central rod 7 is fixedly connected to the telescopic end of the central air pipe 3, and the other end extends upward through the top of the air inlet cap housing 2 and can be lifted and lowered; when the central rod 7 is lifted, the central air pipe 3 extends and abuts against the air inlet cap housing 2, and the air passage of the central air pipe 3 is closed with the air inlet end of the air inlet cap housing 2, and air flows in from the air inlet hole and only passes through the straight-through swirl pipe 4; when the central rod 7 is lowered, the central air pipe 3 shortens and separates from the air inlet cap housing 2, and the air passage of the central air pipe 3 is communicated with the air inlet end of the air inlet cap housing 2. Air flows in from the air inlet hole, one way through the straight-through swirl pipe 4, and the other way through the central air pipe 3, and converges at the bottom of the air inlet cap housing 2 to flow into the next-stage filter of the engine intake system. (In actual use, when the intake environment of the vehicle engine is relatively clean and pre-purification is not required, the central rod 7 can be lowered to contract the central air pipe 3, then the external air flow passes through the central air pipe 3 and the straight-through swirl pipe 4, and finally flows through the air outlet of this air inlet cap to the next-stage filter of the engine for fine filtration.)

[0048] Another way to realize the switching between the communication and closing states of the air passage of the central air pipe 3 and the air inlet end of the air inlet cap housing 2 is to set a movable partition in the air inlet end of the air inlet cap housing 2, and directly open or close the air passage of the central air pipe 3 by moving this partition. For example, a pull rod extending into the air inlet end of the air inlet cap housing 2 can be set on the top of the air inlet cap housing 2, and a thin plate with an area larger than the diameter of the central air pipe 3 is set at one end of the pull rod extending into the air inlet end of the air inlet cap housing 2. After the thin plate is pushed to the top of the central air pipe through the pull rod, the top opening of the central air pipe 3 is closed; after the thin plate is moved to the top of the air inlet cap housing 2 through the pull rod, the air passage of the central air pipe 3 is opened.

[0049] It can be understood that the opening or closing of the air passage of the central air pipe 3 can be realized in many ways and is not limited to the above two ways.

[0050] Reference Figures 1 - 4 , the straight-through swirl pipe 4 includes an air inlet pipe 10, air outlet pipes 11 axially sleeved at both ends inside the air inlet pipe 10 coaxially, and swirl vanes 13; among them: the top flange of the air inlet pipe 10 is hermetically connected to the air inlet panel 8 arranged in the air inlet cap housing 2 by welding or riveting; the top end of the air outlet pipe 11 is accommodated inside the bottom end of the air inlet pipe 10, and the bottom end of the air outlet pipe 11 extends out of the air inlet pipe 10 and then flanges and is hermetically connected to the air outlet panel 9 arranged in the air inlet cap housing 2 by welding or riveting (the depth of the air outlet pipe 11 accommodated in the air inlet pipe 10 can be controlled by the distance between the air inlet panel 8 and the air outlet panel 9); the swirl vanes 13 are fixedly arranged inside the upper end of the air inlet pipe 10.

[0051] Embodiment 2:

[0052] Based on Embodiment 1, in order to meet the intake air purification requirements of agricultural vehicles such as cotton pickers and prevent large-sized impurities from entering and blocking the inlet of the cyclone tube, which may cause a sharp increase in the resistance of the air filter and thus require frequent maintenance of the air filter, a more specific straight-through cyclone tube 4 is provided:

[0053] The effective channel size of the blades of the straight-through cyclone tube 4 is greater than 30 mm (after specifically analyzing and researching the critical channel size of the pre-filter in the intake system during cotton picking operations on-site, it is concluded that a channel size of the centrifugal pre-filter greater than 30 mm will not cause blockage). Moreover, both ends of the central axis 12 of the swirl blade 13 are designed as hemispherical structures. The inner diameter of the intake pipe 10 is 70 mm, and it is a large cyclone tube with a total length of about 200 mm (currently, the inner diameter of the intake pipe of the straight-through cyclone tube 4 used for engine intake air purification on the market is generally less than 40 mm, and most are between 20 - 10 mm). The inner and outer helical lines of the spiral surface of the blade body are both standard helical lines. The helix angle of its outer helical line is in the range of 32° - 40°, and the wrap angle of the blade body is in the range of 100° - 120°. The thickness of the blade body gradually decreases radially outward along the intake pipe. The cross-section of the blade body is an isosceles trapezoid, with the bottom closer to the central axis being the lower base, with a length of 2 mm, and the bottom closer to the inner wall of the intake pipe 10 being the upper base, with a length of 1 mm. This straight-through cyclone tube 4 can achieve a single-tube flow rate of 150 m 3 / h - 220 m 3 / h, and the impurity filtration efficiency can reach up to 90% at most (the range of its impurity filtration efficiency is between 85% - 90%), with an air flow resistance of about 1.2 kPa.

[0054] To enable the double-pass intake cap to achieve the above performance, if a dust extraction pump is used for dust removal, 24V direct current can be used. The dust extraction static pressure is not less than 1.2 times the air flow resistance of the straight-through cyclone tube 4, and the dust extraction flow rate is not less than 10% of the air flow rate passing through the straight-through cyclone tube 4 to ensure that the dust extraction pump can discharge the impurities separated by the straight-through cyclone tube 4.

[0055] Under the design where the helix angle of the above-mentioned helical line is in the range of 32° - 40° and the wrap angle of the blade body is in the range of 100° - 120°, this straight-through cyclone tube 4 can generate an appropriate tangential force to meet the requirement of the highest impurity filtration efficiency of 90%.

[0056] Compared with most directly selected air filters on the market, the double-pass intake cap provided in this embodiment has an air flow resistance in the straight-through cyclone tube 4 lower than 2 kPa, and the impurity filtration efficiency is between 85% - 90%, greatly increasing the maintenance interval of the air filter element. In addition, this double-pass intake cap has a compact structure, with an intake resistance between 500 Pa - 1700 Pa, and can meet the intake air flow rate of 1200 - 2000 m 3The engine intake air volume requirement between

[0057] It can be seen that the above-mentioned double-pass intake cap is equivalent to a pre-filter of the engine intake system. After it is assembled into the engine intake system:

[0058] The outside air containing impurities enters the intake passage 10 through the intake hole 14 and flows into the straight-through cyclone tube 4. The straight-through cyclone tube 4 separates most of the impurities into the dust collection chamber 5; the air purified by the straight-through cyclone tube 4 enters the next-stage filter inside the engine intake system and is finely filtered by the air filter element, then enters the air collection chamber after filtration, and finally passes through the air outlet pipe to the engine intake port to provide clean combustion air for the engine.

[0059] Compared with the intake caps used in existing agricultural vehicles, on the one hand, the double-pass intake cap improves the passing ability of large-size impurities by improving the structure of the straight-through cyclone tube 4 in the intake cap, and has the effect of high-efficiency and low-resistance air flow when purifying impurities in the air; on the other hand, by adopting the structure of the central air pipe 3, when the air is relatively clean, the mode of simultaneous intake of the straight-through cyclone tube 4 and the central air pipe 3 can be adopted to increase the air flow area, reduce the intake resistance, improve the power performance of the vehicle in a good intake environment, and at the same time reduce the fuel consumption of the engine. The double-pass intake cap realizes the problem of avoiding abnormal blockage during use, reduces the rated intake resistance of the engine intake system, improves the power output of the engine, and further improves the operation efficiency of the relevant machinery equipped with the double-pass intake cap.

[0060] In summary, the above is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-pass intake cap, characterized in that, It includes an air intake cap housing, a central air pipe, and a straight-through cyclone tube; One end of the air intake cap housing is the air intake end, and the other end is the air outlet end; The air intake end is provided with air intake holes for allowing air to enter the internal cavity of the air intake cap housing; The central air pipe is sleeved inside the air intake cap housing, and the air passage of the central air pipe has two states of being connected and closed to the air intake end of the air intake cap housing; More than one of the straight-through cyclone tubes are fixedly installed on the outer peripheral side of the central air pipe, and the air intake of each straight-through cyclone tube is connected to the air intake end of the air intake cap housing, and the dust discharge passage of each straight-through cyclone tube is connected to the outside atmosphere; The air outlet of the central air pipe and the straight-through cyclone tube are both connected to the air outlet end of the air intake cap housing; A baffle is provided at the air intake of the central air pipe, and by moving the baffle to open or close the air intake of the central air pipe, the air passage of the central air pipe is connected or closed to the air intake end of the air intake cap housing; The central air pipe makes the air passage of the central air pipe connected or closed to the air intake end of the air intake cap housing by shortening and extending axially inside the air intake cap housing; It further includes a central rod; One end of the central rod is fixedly connected to the central air pipe, and the other end extends upward through the top of the air intake cap housing and can be lifted and lowered; When the central rod is lifted, the central air pipe extends and abuts against the air intake cap housing, making the air passage of the central air pipe in a closed state with the air intake end of the air intake cap housing; When the central rod is lowered, the central air pipe shortens and separates from the air intake cap housing, making the air passage of the central air pipe connected to the air intake end of the air intake cap housing.

2. The double-pass intake cap according to claim 1, characterized in that, The straight-through cyclone tube includes an air inlet pipe, an air outlet pipe, and swirl vanes coaxially sleeved; The top end of the air inlet pipe is hermetically connected to an air intake panel provided inside the air intake cap housing; The top end of the air outlet pipe is accommodated inside the bottom end of the air inlet pipe, and the bottom end of the air outlet pipe extends out of the air inlet pipe and is hermetically connected to an air outlet panel provided inside the air intake cap housing; The circumferential gap between the air inlet pipe and the air outlet pipe is the dust discharge passage; The swirl vanes are fixedly arranged inside the upper end of the air inlet pipe.

3. The double-pass intake cap according to claim 2, characterized in that, The swirl vanes include a central axis and a blade body with a spiral curved surface; The axis of the central axis coincides with the axis of the air inlet pipe, and the blade body is located between the air inlet pipe and the central axis.

4. The double-pass intake cap according to claim 3, wherein Both ends of the central axis are hemispheres.

5. The double-pass intake cap according to any one of claims 2 to 4, characterized in that The thickness of the blade body gradually decreases radially outward along the air inlet pipe.

6. The double-pass intake cap according to any one of claims 1 to 4, characterized in that, The effective channel size of the blades of the straight-through cyclone tube is greater than 30 mm.

7. The double-pass intake cap according to any one of claims 1 to 4, characterized in that, It further includes a dust collection chamber connected to the dust discharge passage of each straight-through cyclone tube; The dust collection chamber is arranged at the bottom of the air intake cap housing, and a dust discharge duckbill is provided at the dust discharge port of the dust collection chamber.

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