CN104653332A - Engine cylinder and intake manifold connecting structure - Google Patents

Abstract

The invention discloses an engine cylinder and intake manifold connecting structure and aims at solving the problem that an engine cannot be started properly during cold start in cold weather due to the low temperature of mixed gas and cannot prevent the engine backfire failure from damaging an intake manifold in the prior art. The engine cylinder and intake manifold connecting structure comprises an intake manifold and a cylinder intake port. A check valve is arranged between the tail end of the intake manifold and the cylinder intake port and comprises a valve body and a valve element. The valve element comprises a blocking piece and a plurality of sliding rods provided with a return spring. The outer ends of the sliding rods are provided with a spring limit head. One end of the return spring is in contact with the blocking piece. The engine cylinder and intake manifold connecting structure has the advantages of being capable of preheating the mixed gas for shortening the cold start time of the engine in cold weather and preventing exhaust gas from entering the intake manifold during engine backfire.

Description

A connection structure between an engine cylinder and an intake manifold

technical field

The invention relates to an engine structure, in particular to a connection structure for controlling an engine and an intake manifold.

Background technique

The engine is the core part of the vehicle's power system. During the intake stroke of the existing engine, the mixed gas enters through the intake manifold, and during the exhaust stroke, the exhaust gas is discharged through the exhaust manifold. The mixed gas is sucked into the cylinder, and the preliminary temperature rise is completed by contacting the high heat element in the cylinder. However, when the car is cold started in a cold environment, it may not be able to start normally because the temperature of the mixed gas entering is too low. There is also the defect of engine tempering in the existing engine, which is due to some failure, the exhaust valve is closed in the exhaust stroke, and the exhaust gas cannot be discharged. At this time, the exhaust gas may pass through the intake valve and enter the intake manifold, which may cause the intake manifold to burst in severe cases. Therefore, the engine and the intake manifold in the prior art lack a one-way air intake control device for preheating the mixed gas and preventing exhaust gas from flowing back into the intake manifold.

Contents of the invention

The invention aims to overcome the problem that the engine in the prior art cannot be started normally due to the insufficient temperature of the mixed gas when it is cold started in cold weather, and it is impossible to avoid the damage to the intake manifold caused by the engine backfire failure, and provides a method that can protect the intake manifold. The mixed gas is preheated to shorten the cold start time of the engine in cold weather; it is a connection structure between the engine cylinder and the intake manifold that prevents the exhaust gas from entering the intake manifold when the engine backfires.

To achieve the above object, the present invention adopts the following technical solutions:

A connection structure between an engine cylinder and an intake manifold, comprising an intake manifold and a cylinder intake port, a check valve is arranged between the end of the intake manifold and the cylinder intake port, and the check valve can be The flow direction is from the intake manifold to the cylinder intake port.

As a preference, the one-way valve includes a valve body and a spool, the spool includes a block piece, a plurality of slide rods, a return spring is provided on the slide rods, and the outer end of the slide rods is provided with There is a spring limit head, the blocking piece is slidingly connected with all the sliding rods, one end of the return spring contacts the blocking piece, and the blocking piece covers the joint between the intake manifold and the air inlet of the cylinder .

Preferably, the valve body is provided with a heater, the heater is located at the end of the intake manifold close to the cylinder intake port, and the heater is connected to the outer pipe wall of the intake manifold.

As another preference, the one-way valve includes a valve body and a valve core, the valve body includes a baffle arranged at one end close to the intake manifold and a stepped hole arranged at the end close to the air inlet of the cylinder, the baffle There is a through hole in the center of the plate; the valve core includes a plug for blocking the through hole, a connecting rod and a plug for blocking the stepped hole. The diameter of the hole near the end of the intake manifold is smaller than the diameter of the step hole near the air inlet of the cylinder; the valve body outer jacket is provided with a heat exchange sleeve, and the inside of the heat exchange sleeve is provided with a heat exchange chamber, which is connected with a heater. The heat chamber and the heater are filled with liquid heat-conducting medium; the inner surface shell of the heat exchange jacket is slidingly connected with a number of heat-conducting sliding columns, one end of the heat-conducting sliding column passes through the inner surface shell of the heat exchange jacket and the inner wall of the valve, and the other end is located A sliding rod is fixedly connected to the cavity and coaxially; one end of the sliding rod is connected to the heat conduction sliding column, and the other end passes through the outer surface shell of the heat exchange sleeve and is slidably connected with the heat exchange sleeve, and the sliding rod is provided with a sliding drive mechanism; The heat conduction spool is a hollow structure, and the part of the heat conduction spool located in the heat exchange chamber is provided with a convection hole connected to its inner cavity; the part of the heat conduction spool passing through the valve body is provided with elastic spiral fins. One end of the spiral fin is fixedly connected to the inner wall of the valve body tube, and the other end is fixedly connected to the end of the heat conduction sliding post.

Preferably, the inner wall of the valve is provided with a storage groove for accommodating the spiral fins, and the heat conduction sliding post passes through the storage groove.

Preferably, the liquid heat-conducting medium is water or saturated sodium acetate solution.

As a preference, the sliding drive mechanism includes a connecting plate, a driving cylinder and a cylinder seat, the ends of each slide rod passing through the outer surface of the heat exchange jacket are connected to each other through the connecting plate, and the driving cylinder is fixed to the intake manifold through the cylinder seat , the end of the cylinder rod that drives the cylinder is connected to the connecting plate.

Preferably, it is characterized in that the valve core, the heat conduction sliding column and the spiral fins are all made of heat conduction materials.

Therefore, the present invention has the following beneficial effects: (1) preheating the mixed gas, shortening the cold start time of the engine in cold weather; (2) preventing the exhaust gas from entering the intake manifold when the engine backfires.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present invention;

Fig. 2 is a partial cross-sectional schematic diagram of the present invention during the intake stroke of the cylinder in embodiment 2.

Fig. 3 is a partial cross-sectional schematic diagram of the present invention during the compression stroke, power stroke and exhaust stroke of the cylinder in embodiment 2.

In the figure: 1 intake manifold; 2 cylinder intake port; 3 one-way valve; 31 valve body; 32 plugging; 33 connecting rod; 34 blocking piece; 35 return spring; 4 heat exchange sleeve; 41 heat exchange cavity; 5 heater; 6 heat conduction sliding column; 61 convection hole; 7 slide rod;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: as shown in Figure 1, a kind of engine cylinder of the present invention and intake manifold connection structure comprise intake manifold 1 and cylinder intake port 2, between intake manifold end and cylinder intake port A one-way valve 3 is arranged between them, and the flow direction of the one-way valve is from the intake manifold to the air inlet of the cylinder. The one-way valve 3 includes a valve body and a spool, the spool includes a blocking piece 34, a plurality of slide bars 7, the slide bar is provided with a return spring 35, and the outer end of the slide bar A spring limiter is provided, and the blocking piece is slidably connected to all slide bars, and one end of the return spring 35 contacts the blocking piece 34, and the blocking piece covers the intake manifold and the air inlet of the cylinder of the connection. The valve body is provided with a heater 5, and the heater is located at the end of the intake manifold close to the air inlet of the cylinder, and the heater is connected with the outer pipe wall of the intake manifold 1.

The heater 5 can heat the gas to shorten the cold start time of the engine in cold weather. The type of heater can be selected according to needs. The mixed gas can back off the blocking sheet, thereby smoothly entering the air intake port 2 of the cylinder from the intake manifold 1. After the air intake action is completed, the blocking sheet 34 can be reset under the action of the return spring 35.

Embodiment 2: as shown in Fig. 2, Fig. 3, a kind of engine cylinder and intake manifold connection structure of the present invention, comprise intake manifold 1 and cylinder intake port 2, at the end of intake manifold and cylinder intake A one-way valve is arranged between the air ports, and the flow direction of the one-way valve is from the intake manifold to the air intake port of the cylinder. The one-way valve 3 includes a valve body 31 and a valve core. The valve body 31 includes a partition 37 arranged at one end close to the intake manifold 1 and a stepped hole arranged at one end close to the air intake port 2 of the cylinder, and a through hole is arranged at the center of the partition 37 . The spool includes a plug 32 for plugging the through hole, a connecting rod 33 and a plug 34 for plugging the step hole, a return spring 35 is arranged between the plug plug 34 and the dividing plate 37, and the diameter of the plug plug 34 is larger than that of the step. The aperture at one end of the hole near the intake manifold 1 is smaller than the aperture at one end of the stepped hole near the air inlet 2 of the cylinder.

The valve body 31 is provided with a heat exchange sleeve 4, and the heat exchange sleeve 4 is provided with a heat exchange chamber 41, and the heat exchange chamber 41 is connected with a heater 5, and the heat exchange chamber 41 and the heater 5 are filled with water; the heat exchange sleeve 4 The inner shell is slidably connected with a number of heat-conducting sliding posts 6, one end of the heat-conducting sliding post 6 passes through the inner surface shell of the heat exchange sleeve 4 and the inner wall of the valve body 31, and the other end is located in the heat exchange chamber 41 and is coaxially fixedly connected with a sliding rod 7. One end of the sliding rod 7 is connected to the heat transfer sliding column 6, and the other end passes through the outer surface shell of the heat exchange sleeve 4 and is slidably connected with the heat exchange sleeve 4. The sliding rod 7 is provided with a sliding driving mechanism; the heat conducting sliding column 6 is a hollow structure, and the part of the heat conduction spool 6 located in the heat exchange cavity 41 is provided with a convection hole 16 communicating with its inner cavity; the part of the heat conduction spool 6 passing through the valve body 31 is provided with elastic spiral fins 8, One end of the spiral fin 8 is fixedly connected to the inner wall of the valve body 31 , and the other end is fixedly connected to the end of the heat conduction sliding column 6 . The inner wall of the valve body 31 is provided with a receiving groove 36 for receiving the spiral fin 8 , and the heat conduction sliding post 6 passes through the receiving groove 36 .

The sliding drive mechanism includes a connecting plate 9, a driving cylinder 10 and a cylinder base 11. The end of each slide rod 7 passing through the outer surface of the heat exchange sleeve 4 is connected to each other through the connecting plate 9, and the driving cylinder 10 is fixed on the intake air through the cylinder base 11. Manifold 1 , the end of the cylinder rod driving the cylinder 10 is connected to the connection plate 9 .

In this embodiment, the valve core, the heat conduction sliding column 6 and the spiral fins 8 all use heat conduction materials.

The one-way valve 3 plays a one-way control function, which can ensure that the mixed gas enters the engine cylinder from the intake manifold 1 through the one-way valve 3 during the intake stroke, and the exhaust gas cannot pass through the one-way valve 3 into the engine cylinder during the exhaust stroke. Gas manifold 1. It is thus possible to prevent exhaust gas from entering the intake manifold 1 when the engine backfires.

When the one-way valve 3 is closed, there is a part of the mixed gas in the space between the plug 32 and the plug 34. When the engine is cold started, the heater 5 heats the liquid heat transfer medium, and the liquid heat transfer medium flows through the heat exchange chamber 41 and this part. The mixed gas undergoes heat exchange to preheat this part of the mixed gas. At the same time, the heat-conducting sliding column 6 is affected by the sliding drive mechanism and the sliding rod 7, and slides out to the middle of the valve body 31, unfolding the spiral fins 8, increasing the contact area between the heat exchange chamber 41 and the mixed gas, and the contact position is close to the center of the exhaust pipe , enhance the preheating effect on the exhaust gas. During the intake stroke of the cylinder, the heat conduction sliding column 6 resets, and the compressed and folded spiral fin 8 is stored in the receiving groove 36 . The receiving groove 36 protects the structure of the heat conduction sliding column 6 and the spiral fin 8 , and at the same time ensures that the mixed gas passes through the one-way valve 3 smoothly. Want to affect the intake stroke, the preheated mixed gas and other mixed gas enter the cylinder to mix, increase the temperature of the mixed gas in the cylinder, shorten the cold start time of the engine in cold weather, and make the engine start normally as soon as possible.

Claims (8)

1. A connection structure between an engine cylinder and an intake manifold, characterized in that it comprises an intake manifold and a cylinder intake, and a check valve is arranged between the end of the intake manifold and the cylinder intake, said The flow direction of the check valve is from the intake manifold to the cylinder intake port. 2. A connection structure between an engine cylinder and an intake manifold according to claim 1, wherein said one-way valve comprises a valve body and a spool, and said spool comprises a blocking sheet, several A slide bar, the slide bar is provided with a return spring, and the outer end of the slide bar is provided with a spring limit head, and the blocking piece is slidably connected with all the slide bars, and one end of the return spring is Contact the blocking sheet, and the blocking sheet covers the joint between the intake manifold and the air intake port of the cylinder. 3. A connection structure between an engine cylinder and an intake manifold according to claim 1 or 2, wherein the valve body is provided with a heater, and the heater is located near the intake manifold. One end of the air intake port of the cylinder, the heater is connected with the outer pipe wall of the intake manifold. 4. A connection structure between an engine cylinder and an intake manifold according to claim 1, wherein the check valve includes a valve body and a valve core, and the valve body includes a The baffle at one end of the pipe and the step hole arranged at the end close to the air inlet of the cylinder, the center of the baffle is provided with a through hole; the valve core includes a plug for blocking the through hole, a connecting rod and a sealing diaphragm for blocking the step hole, A return spring is arranged between the blocking diaphragm and the separator, and the diameter of the blocking diaphragm is larger than the diameter of the step hole near the intake manifold, and smaller than the diameter of the step hole near the cylinder inlet; The heat exchange sleeve is equipped with a heat exchange cavity inside the heat exchange sleeve, and the heat exchange cavity is connected with a heater. The heat exchange cavity and the heater are filled with a liquid heat transfer medium; One end of the sliding column passes through the inner surface shell of the heat exchange sleeve and the inner wall of the valve, and the other end is located in the heat exchange chamber and is coaxially fixedly connected with a sliding rod; one end of the sliding rod is connected to the heat conducting sliding column, and the other end passes through the heat exchanging sleeve The shell on the outer surface is slidingly connected to the heat exchange sleeve, and the slide bar is provided with a sliding drive mechanism; the heat conduction slide column is a hollow structure, and the part of the heat conduction slide column located in the heat exchange chamber is provided with a convection hole communicating with the inner cavity; the heat conduction slide column The part of the column passing through the valve body is covered with elastic spiral fins, one end of which is fixedly connected to the inner wall of the valve body tube, and the other end is fixedly connected to the end of the heat conduction sliding column. 5. A connection structure between engine cylinder and intake manifold according to claim 4, characterized in that, the inner wall of the valve is provided with a storage groove for accommodating spiral fins, and the heat conduction sliding post passes through the storage groove . 6. A connection structure between an engine cylinder and an intake manifold according to claim 4, wherein said liquid heat transfer medium is water or a saturated sodium acetate solution. 7. A connection structure between an engine cylinder and an intake manifold according to claim 4, wherein the sliding drive mechanism comprises a connecting plate, a driving cylinder and a cylinder seat, and each sliding rod passes through the heat exchange jacket The end of one end of the surface is connected to each other through the connecting plate, the driving cylinder is fixed to the intake manifold through the cylinder seat, and the end of the cylinder rod of the driving cylinder is connected to the connecting plate. 8. A connection structure between an engine cylinder and an intake manifold according to claim 4 or 5 or 6 or 7, wherein the valve core, heat conduction spool and spiral fins are all made of heat conduction materials.