Intake manifold for improving intake pressure waves

Abstract

The utility model discloses an intake manifold for improving intake pressure waves, which comprises a device body, the device body comprises an upper manifold, a pressure stabilizing cavity and a lower manifold, the pressure stabilizing cavity is positioned at the bottom end of the lower manifold, the lower manifold is positioned at the lower end of the upper manifold, and the upper manifold, the lower manifold and the pressure stabilizing cavity are of a through structure; the upper manifold is of a U-shaped structure, a manifold air outlet is formed in one end of the upper manifold, a plurality of sets of backflow prevention cavities which are transversely distributed at equal intervals are formed in the upper manifold, each backflow prevention cavity is of an arc-shaped structure, backflow resistance ribs are arranged in the backflow prevention cavities and are of a square structure, and downstream guide ribs are arranged between the two sets of backflow prevention cavities. The downstream guide rib is of an arc-shaped structure. According to the device, after air inflow backflow is prevented, air with increased pressure can flow into an air cylinder, so that the inflation efficiency is improved, the power of an engine is improved, the pumping loss is reduced, and the fuel economy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an intake manifold capable of increasing intake pressure waves. Background Art

[0002] In an internal combustion engine, the intake manifold is a key component that introduces the air and fuel mixture into the engine cylinders. The engine has four strokes. During engine operation, due to the discontinuous operation of the engine cylinders, the intake valves alternately open and close as the pistons reciprocate, causing the pressure within the intake manifold to fluctuate periodically. Consequently, the airflow in the intake manifold is pulsating. When the intake valve opens, air or a mixture flows into the cylinder. When the valve closes, the inertia of the gas flow causes the flowing gas to collide with the closed intake valve and rebound, generating a shock wave. After rebounding, the gas flows in the opposite direction. These pressure fluctuations generate intake pressure waves within the intake manifold, which in turn affect the gas flow.

[0003] The existing intake manifold has the following defects:

[0004] The existing intake manifold has an optimized length and can use the intake pressure wave to improve the charging efficiency. However, the flow rate and pressure fluctuation of the gas in the intake manifold change with the changes in engine speed and load. The fixed manifold length cannot match the requirements of all speeds and loads. As a result, in most cases, the intake pressure wave has a counter-effect on the charging efficiency.

[0005] For this, a solution is needed. Utility Model Content

[0006] (1) Technical problems solved

[0007] In view of the deficiencies in the prior art, the present invention provides an intake manifold that improves intake pressure waves, so as to solve the problems raised in the above-mentioned background technology.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intake manifold for improving the intake pressure wave, comprising a device body, wherein the device body comprises an upper manifold, a pressure stabilizing chamber and a lower manifold, the pressure stabilizing chamber is located at the bottom end of the lower manifold, and the lower manifold is located at the other end of the upper manifold, and the upper manifold, the lower manifold and the pressure stabilizing chamber are a through-type structure; the upper manifold is in a U-shaped structure, a manifold air outlet is provided at one end of the upper manifold, a plurality of groups of anti-backflow chambers distributed in a laterally equidistant manner are provided inside the upper manifold, the anti-backflow chamber is in an arc-shaped structure, a backflow resistance rib is provided in the anti-backflow chamber, the backflow resistance rib is in a square-shaped structure, a downstream guide rib is provided between the two groups of anti-backflow chambers, and the downstream guide rib is in an arc-shaped structure.

[0010] Preferably, a manifold air inlet is provided at one end of the pressure stabilizing chamber, a throttle mounting flange is provided on the outside of the manifold air inlet, a carbon canister connector and a vacuum signal connector are provided on the top of the right end of the pressure stabilizing chamber, and an EGR inlet is provided in the pressure stabilizing chamber.

[0011] Preferably, a plurality of groups of injector mounting holes are provided on the top of the upper manifold, a manifold fixing flange is provided on the air outlet of the manifold, and a plurality of groups of mounting flange bolt holes are opened on the surface of the manifold fixing flange.

[0012] Preferably, a temperature and pressure sensor mounting seat is provided on the rear side of the pressure stabilizing chamber.

[0013] Preferably, a manifold reinforcement baffle is provided between the upper manifold, the lower manifold and the pressure stabilizing chamber, the manifold reinforcement baffle is in a cross-shaped structure, an embedding installation opening is provided on the upper manifold, and a manifold welding outer plate is installed in the embedding installation opening.

[0014] (3) Beneficial effects

[0015] The utility model provides an intake manifold that improves intake pressure waves and has the following beneficial effects:

[0016] This intake manifold is designed with downstream guide ribs, a backflow prevention chamber, and reverse flow resistance ribs to enhance intake pressure waves. The engine's operating process consists of four reciprocating strokes: intake stroke, compression stroke, power stroke, and exhaust stroke. During the intake process, gas flows at high speed from the pressure-stabilizing chamber in the manifold to the manifold outlet. During forward flow, the gas flows smoothly, guided by the downstream guide ribs, unaffected by the reverse flow resistance ribs, resulting in minimal flow resistance. During the intake stroke, the intake valve opens, and air flows from the intake manifold inlet into the intake manifold surge chamber. From there, it flows through the manifold, into the cylinder head airway, and finally into the cylinder through the open intake valve. When the engine enters the compression stroke, the intake valve closes. Due to the inertia of the flowing gas, it strikes the closed intake valve and reflects back, creating a reverse flow. Some of the gas is guided by downstream guide ribs into the anti-backflow chamber. There, it rebounds against the reverse flow ribs, striking the reverse-flowing gas and preventing it from flowing in the opposite direction, thereby reducing or even eliminating the reverse pressure wave. This causes the gas to remain near the intake valve for a short period of time, thereby increasing the local intake pressure. During the next intake stroke, when the intake valve opens, the higher-pressure gas flows into the cylinder, improving charging efficiency, increasing engine power, reducing pumping losses, and improving fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic structural diagram of the overall side of the utility model;

[0019] Figure 3 It is the whole split structure schematic view of the utility model;

[0020] Figure 4 It is the structure schematic view of the intake manifold inside the utility model.

[0021] In the figure, 1, device body; 2, upper manifold; 3, pressure stabilizing chamber; 4, lower manifold; 5, manifold air inlet; 6, backflow prevention chamber; 7, reverse flow resistance rib; 8, forward flow guide rib; 9, carbon can joint; 10, vacuum signal joint; 11, EGR inlet; 12, throttle installation flange; 13, fuel injector installation hole; 14, manifold fixing flange; 15, installation flange bolt hole; 16, temperature pressure sensor mounting seat; 17, manifold air outlet; 18, manifold reinforcing partition; 19, embedded installation opening; 20, manifold welding outer sheet. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Please refer to Figure 1-4 The embodiment of the utility model provides a technical scheme:

[0024] Embodiment 1

[0025] For the above problems to be solved: the existing intake manifold optimizes the length, and the intake pressure wave can be used to improve the charging efficiency, but the flow rate and pressure fluctuation of the gas in the intake manifold change with the engine speed and load, and the fixed manifold length cannot match the demand of all speeds and loads, causing the intake pressure wave to have a negative effect on the charging efficiency in most cases.

[0026] The solution is as follows: An intake manifold for improving the intake pressure wave includes a device body 1, the device body 1 includes an upper manifold 2, a pressure stabilizing chamber 3 and a lower manifold 4, the pressure stabilizing chamber 3 is located at the bottom end of the lower manifold 4, and the lower manifold 4 is installed at the other end of the upper manifold 2, and the upper manifold 2, the lower manifold 4, and the pressure stabilizing chamber 3 are a through-type structure. The upper manifold 2 is in a U-shaped structure, and a manifold outlet 17 is provided at one end of the upper manifold 2. A plurality of groups of anti-backflow cavities 6 are provided inside the upper manifold 2 in a laterally equidistant manner. The anti-backflow cavities 6 are in an arc-shaped structure. A reverse flow resistance rib 7 is provided in the anti-backflow cavities 6. The reverse flow resistance rib 7 is in a square-shaped structure. A downstream guide rib 8 is provided between two groups of the anti-backflow cavities 6. The downstream guide rib 8 is in an arc-shaped structure. During air intake, during the air intake process, the gas flows from the pressure stabilizing cavity 3 in the upper manifold 2 at a high speed to the manifold outlet 17. When the gas flows forward, it flows smoothly under the guidance of the downstream guide rib 8 without being subject to reverse resistance. Due to the influence of ribs 7, flow resistance is minimal. During the intake stroke, the intake valve opens, and air flows from the intake manifold inlet port 5 into the intake manifold surge chamber 3. From there, it flows through the lower manifold 4 and upper manifold 2, into the cylinder head airway, and finally into the cylinder through the open intake valve. When the engine enters the compression stroke, the intake valve closes. Due to the inertia of the flowing gas, it strikes the closed intake valve and is reflected back, forming a reverse flow. Some of the gas is guided by downstream guide ribs 8 into the anti-backflow chamber 6. There, it rebounds under the action of reverse flow resistance ribs 7, striking the reverse-flowing gas and preventing it from flowing in the opposite direction, thereby reducing or even eliminating the reverse pressure wave. This causes the gas to remain near the intake valve for a short period of time, thereby increasing the local intake pressure. During the next intake stroke, when the intake valve opens, the higher-pressure gas flows into the cylinder, improving charging efficiency, increasing engine power, reducing pumping losses, and improving fuel economy.

[0027] A manifold air inlet 5 is provided at one end of the lower manifold tube 4, and a throttle mounting flange 12 is provided on the outside of the manifold air inlet 5. A carbon canister connector 9 and a vacuum signal connector 10 are provided on the top right end of the pressure stabilizing chamber 3. The pressure stabilizing chamber 3 is provided with an EGR inlet 11. The throttle mounting flange 12 is for installing the throttle, and the carbon canister connector 9 and the vacuum signal connector 10 on the top right end of the pressure stabilizing chamber 3 are for connecting the carbon canister and the sensor.

[0028] The top of the upper manifold 2 is provided with several groups of injector mounting holes 13, and the manifold air outlet 17 is provided with a manifold fixing flange 14. The surface of the manifold fixing flange 14 is provided with several groups of mounting flange bolt holes 15. The manifold fixing flange 14 on the manifold air outlet 17 is for docking and fixing.

[0029] The rear side of the stable pressure cavity 3 is provided with a temperature pressure sensor mounting seat 16, which is used to install and fix the temperature pressure sensor, so as to keep the temperature pressure sensor working normally.

[0030] The upper manifold 2 and the lower manifold 4 are provided with a manifold reinforcing partition plate 18, which is in a cross-shaped structure. The upper manifold 2 is provided with an embedded mounting port 19, and the manifold welding outer sheet 20 is installed in the embedded mounting port 19. The upper manifold 2 can be maintained by dismounting the manifold welding outer sheet 20 in the embedded mounting port 19.

[0031] Working principle: during the operation, in the process of air intake, the gas flows through the stable pressure cavity 3, the lower manifold 4 and the upper manifold 2 to the manifold gas outlet 17 at high speed. When the gas flows forward, it flows smoothly under the guidance of the flow guiding rib 8 and is not affected by the reverse resistance rib 7, so the flow resistance is small. During the intake stroke, the intake valve is opened, the air flows into the intake manifold from the intake port 5 of the intake manifold, and then flows through the stable pressure cavity 3, the lower manifold 4 and the upper manifold 2, and then flows into the cylinder head air duct, and then flows into the cylinder through the opened intake valve. When the engine enters the compression stroke, the intake valve is closed. Since the flowing gas has inertia, the flowing gas reflects back after hitting the closed intake valve, forming reverse flow. Part of the gas is guided into the anti-backflow cavity 6 by the flow guiding rib 8 and bounces back under the action of the reverse resistance rib 7, hits the reverse flowing gas and prevents the gas from flowing backward, thereby reducing or even eliminating the reverse pressure wave. The gas stays near the intake valve for a short time, thereby improving the local intake pressure. In the next intake stroke, when the intake valve is opened, the gas with high pressure flows into the cylinder, thereby improving the charging efficiency, improving the power of the engine, reducing the pumping loss and improving the fuel economy.

[0032] The components of the present invention are 1, device body; 2, upper manifold; 3, pressure stabilizing chamber; 4, lower manifold; 5, manifold air inlet; 6, anti-backflow chamber; 7, reverse flow resistance rib; 8, downstream guide rib; 9, carbon canister connector; 10, vacuum signal connector; 11, EGR inlet; 12, throttle mounting flange; 13, injector mounting hole; 14, manifold fixing flange; 15, mounting flange bolt hole; 16, temperature and pressure sensor mounting seat; 17, manifold air outlet; 18, manifold reinforcement partition; 19, embedded mounting port; 20, manifold welding outer plate. All the components are universal standard parts or components known to those skilled in the art. Their structures and principles are all in accordance with the present invention. Technical personnel can learn about this from technical manuals or through conventional experimental methods. The problem that the utility model solves is that the existing intake manifold has optimized its length, and the intake pressure wave can be used to improve the charging efficiency. However, the flow rate and pressure fluctuation of the gas in the intake manifold change with the changes in engine speed and load. The fixed manifold length cannot match the requirements of all speeds and loads, resulting in the problem that the intake pressure wave has a counter-effect on the charging efficiency in most cases. The utility model can increase the pressure of gas flowing into the cylinder through the mutual combination of the above-mentioned components, thereby improving the charging efficiency, increasing the power of the engine, reducing pumping losses, and improving fuel economy.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0034] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An intake manifold for increasing intake pressure wave, characterized in that: The device comprises a main body (1), wherein the main body (1) comprises an upper manifold (2), a pressure stabilizing chamber (3) and a lower manifold (4), wherein the pressure stabilizing chamber (3) is located at the bottom end of the lower manifold (4), and the lower manifold (4) is located at the other end of the upper manifold (2), and the upper manifold (2), the lower manifold (4) and the pressure stabilizing chamber (3) are of a through-type structure; The upper manifold (2) is of U-shaped structure. A manifold air outlet (17) is provided at one end of the upper manifold (2). A plurality of groups of anti-backflow cavities (6) are provided inside the upper manifold (2) and are distributed in a transversely equidistant manner. The anti-backflow cavities (6) are of arc-shaped structure. A reverse flow resistance rib (7) is provided inside the anti-backflow cavities (6). The reverse flow resistance rib (7) is of square structure. A downstream guide rib (8) is provided between two groups of the anti-backflow cavities (6). The downstream guide rib (8) is of arc-shaped structure.

2. The intake manifold for increasing intake pressure wave according to claim 1, characterized in that: A manifold air inlet (5) is provided at one end of the pressure stabilizing chamber (3), a throttle mounting flange (12) is provided on the outside of the manifold air inlet (5), a carbon canister connector (9) and a vacuum signal connector (10) are provided at the top of the right end of the pressure stabilizing chamber (3), and an EGR inlet (11) is provided in the pressure stabilizing chamber (3).

3. The intake manifold for increasing intake pressure wave according to claim 1, characterized in that: The top of the upper manifold (2) is provided with a plurality of groups of injector mounting holes (13), the manifold air outlet (17) is provided with a manifold fixing flange (14), and the surface of the manifold fixing flange (14) is provided with a plurality of groups of mounting flange bolt holes (15).

4. The intake manifold for increasing intake pressure wave according to claim 1, characterized in that: A temperature and pressure sensor mounting seat (16) is provided on the rear side of the pressure stabilizing chamber (3).

5. The intake manifold for increasing intake pressure wave according to claim 1, characterized in that: A manifold reinforcement baffle (18) is provided between the upper manifold (2), the lower manifold (4) and the pressure stabilizing chamber (3); the manifold reinforcement baffle (18) is in a cross-shaped structure; an embedding installation opening (19) is provided on the upper manifold (2); a manifold welding outer plate (20) is installed in the embedding installation opening (19).

Images