CN108979906A - A kind of EGR valve and engine - Google Patents

Abstract

The invention discloses an EGR valve and an engine, and relates to the technical field of engines. The EGR valve includes a valve body, in which an air intake channel and an exhaust channel communicated with each other are formed. The cap is fixedly connected, and the push rod can drive the valve cap to seal the joint between the intake passage and the exhaust passage; the first accommodation groove is formed in the intake passage, the balance cap is set in the first accommodation groove, and the balance cap is fixedly connected to the push rod , the peripheral side wall of the balance cap fits with the groove wall of the first accommodation groove and can slide along the groove wall of the first accommodation groove; the pressure generated by the exhaust gas in the intake passage acting on the valve cap and the pressure generated by the balance cap equal in size and opposite in direction. An engine is also disclosed. The EGR valve and the engine have high reliability, prevent the valve cap from being opened passively, have low intake resistance, high intake efficiency, and high control precision of the EGR valve.

Description

A kind of EGR valve and engine

technical field

The invention relates to the technical field of engines, in particular to an EGR valve and an engine.

Background technique

Exhaust gas recirculation (EGR) is a method of introducing a part of the exhaust gas to the inhaled fresh air (or mixed gas) during the working process of the engine, and returning it to the inside of the cylinder for recirculation to participate in combustion, which reduces the temperature of the combustion chamber and improves the engine. Efficiency Improves the combustion environment, reduces engine load, reduces emissions of NO _x compounds, reduces knocking, and prolongs the service life of various components. The EGR valve is a product installed on the engine to guide the exhaust gas from the engine combustion to the intake manifold to participate in the combustion. When the engine is running under load, the EGR valve opens to allow a small amount of waste to enter the intake manifold. The combustible mixture enters the combustion chamber together; at idle speed, the EGR valve is closed.

In the prior art, the structural diagram of the EGR valve in the closed state is shown in Figure 1. The EGR valve mainly includes a valve body 1', an end cover 2', a valve cap 3', a shaft sleeve 4', a push rod 5' and a power source 6', the valve body 1' forms an intake channel 7' and an exhaust channel 8'. Among them, the power source 6' drives the push rod 5' to move, and then controls the separation and bonding of the valve cap 3' and the end cover 2', and correspondingly realizes the connection and closure of the intake passage 7' and the exhaust passage 8'. The structural diagram of a working condition when the EGR valve is in the open state is shown in Figure 2, the valve cap 3' is separated from the end cover 2', the flow direction of the exhaust gas is shown by the arrow in Figure 2, and the opening direction of the valve cap 3' Contrary to the flow direction of the exhaust gas, the exhaust gas flows in from the intake channel 7' and is discharged from the exhaust channel 8'. The main technical problems in the prior art include:

(1) The push rod 5' needs to overcome the pressure of the exhaust gas pressure on the valve cap 3' to open the valve cap 3', and at the same time the exhaust gas collides with the valve cap 3' at a certain speed, and the direction of the airflow is at the opening of the valve cap 3' There is a change, where the energy loss of the exhaust gas is large, the intake efficiency is low, and it is difficult to increase the EGR rate;

(2) When the engine is under specific working conditions such as idling, low speed and low load, cold running or full speed and full load, the EGR valve needs to be in the closed state. At this time, if the exhaust pressure of the exhaust gas is greater than the intake pressure and the pulling force of the power source 6' on the push rod 5', the valve cap 3' will be passively opened, and the opening direction of the valve cap 3' is the same as the flow direction of the exhaust gas at this time. The structural diagram of the EGR valve in the passive open state is shown in FIG. 3 . As indicated by the arrow direction in FIG. 3 , the exhaust gas flows in from the exhaust passage 8 ′ and is discharged from the intake passage 7 ′. At this time, the opening of the valve cap 3' and the exhaust gas recirculation condition are both uncontrollable, causing the performance of the engine to deteriorate; the push rod moves downward passively, and the driving force is transmitted to the power source 6', resulting in damage to the rotor of the power source.

Contents of the invention

In view of the above problems, the present invention proposes an EGR valve and an engine, which have high reliability, can prevent the valve cap from being opened passively, have low intake resistance, high intake efficiency, and high control precision of opening and closing of the EGR valve.

The present invention adopts following technical scheme:

An EGR valve, comprising a valve body, in which an intake channel and an exhaust channel communicated with each other are formed, and a push rod is arranged at one end of the valve body and further includes:

Valve cap, the valve cap is arranged in the exhaust passage, one end of the push rod passes through the intake passage and is fixedly connected with the valve cap, and the push rod can drive the valve cap to seal or connect the connection between the intake passage and the exhaust passage;

A balance cap, a first accommodation groove is formed in the air intake channel, the balance cap is arranged in the first accommodation groove, the balance cap is fixedly connected to the push rod, the circumferential side wall of the balance cap is attached to the groove wall of the first accommodation groove and can be moved along the groove wall of the first receiving groove slides;

The pressure generated by exhaust gas acting on the valve cap in the intake passage is equal in magnitude and opposite in direction to the pressure generated on the balance cap.

As a preferred solution of the present invention, the valve cap and the balance cap are integrally formed through a connecting sleeve to form a cap body assembly, and the push rod is passed through the cap body assembly and fixedly connected with the cap body assembly.

As a preferred solution of the present invention, an end cover is provided at the junction of the intake passage and the exhaust passage, the end cover is fixedly connected to the valve body, and the valve cap can abut against the end cover to seal the intake passage and the exhaust passage.

As a preferred solution of the present invention, the end cap is a ring structure, the diameter of the inner ring surface of the end cap is smaller than the outer diameter of the valve cap, and the valve cap can abut against the inner ring surface of the end cap from the side of the exhaust passage to realize valve The cap seals the intake and exhaust passages.

As a preferred solution of the present invention, the bottom of the first accommodating groove is further provided with a second accommodating groove, and a shaft sleeve is arranged in the second accommodating groove, and the push rod is passed through the shaft sleeve.

As a preferred solution of the present invention, a mounting groove is provided on the outer peripheral surface of the balance cap, and a sealing ring is embedded in the mounting groove, and the sealing ring can be attached to the first receiving groove.

As a preferred solution of the present invention, the valve cap includes a connecting portion and a bending portion, the bending portion is arranged on the outer periphery of the connecting portion and is arranged at an angle with the connecting portion, the connecting portion is connected with the connecting sleeve, and the bending portion can be connected with the connecting sleeve. The inner ring surfaces of the end caps abut against each other.

As a preferred solution of the present invention, the movement direction of the valve cap away from the end cover is the same as the flow direction of the exhaust gas.

As a preferred solution of the present invention, the intake passage is arranged on the side of the valve body, the exhaust passage is arranged on the bottom surface of the valve body, and the intake passage and the exhaust passage communicate at right angles.

An engine employing the EGR valve described above.

The beneficial effects of the present invention are:

(1) A kind of EGR valve that the present invention proposes, by arranging valve cap and balance cap, the pressure that the exhaust gas in the intake channel acts on the valve cap and the pressure that produces on the balance cap are equal in size and opposite in direction, so that no matter The pressure of the exhaust gas in the intake passage can be offset by the force of the valve cap and the balance cap on the push rod, so that the opening action of the valve cap is only driven by the power source. This setting can prevent the valve cap from being passively opened, and the intake resistance is low. The control precision of the opening and closing of the EGR valve is high.

(2) A kind of engine that the present invention proposes adopts above-mentioned EGR valve, and reliability is high, and intake efficiency is high.

Description of drawings

Fig. 1 is a structural schematic diagram of an EGR valve in a closed state in the prior art;

Fig. 2 is a structural schematic diagram of a working condition when the EGR valve is in an open state in the prior art;

Fig. 3 is a schematic structural view of the EGR valve in the prior art when it is in a passive open state;

Fig. 4 is the structural representation of the EGR valve provided by the present invention;

Fig. 5 is a partial enlarged view of place A in Fig. 4;

Fig. 6 is a schematic structural view of the cap assembly in the EGR valve provided by the present invention.

In the picture:

1. Valve body; 2. End cover;

3. Valve cap; 31. Connecting part; 32. Bending part;

4. Shaft sleeve; 5. Push rod; 6. Power source; 7. Intake channel;

8. Exhaust channel; 81. The first storage tank; 82. The second storage tank;

9. Balance cap; 91. Seal ring; 10. Connecting sleeve; 11. Cap body assembly;

1', valve body; 2', end cover; 3', valve cap; 4', shaft sleeve; 5' push rod; 6', power source; 7', intake channel; 8', exhaust channel.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Fig. 4 is the structural representation of the EGR valve that the present invention provides, as can be seen in Fig. 4, this EGR valve mainly comprises valve body 1, push rod 5, air valve cap 3 and balance cap 9, wherein forms the inlet that communicates with each other in valve body 1 The air passage 7 and the exhaust passage 8, the intake passage 7 is used to introduce the exhaust gas discharged from the engine combustion into the EGR valve, the exhaust passage 8 communicates with the intake manifold of the engine, and guides the exhaust gas in the EGR valve to the intake manifold The tube participates in the combustion. Specifically, the state shown in FIG. 4 is the state in which the EGR valve is closed, and the valve cap 3 is arranged in the exhaust passage 8 for opening or closing the EGR valve. The other end of the push rod 5 passes through the intake passage 7 and The valve cap 3 is fixedly connected, and the push rod 5 can drive the valve cap 3 to seal the joint between the intake channel 7 and the exhaust channel 8 . The air intake channel 7 is formed in the first accommodation groove 81, the balance cap 9 is arranged in the first accommodation groove 81, the balance cap 9 is fixedly connected on the push rod 5, and the circumferential side wall of the balance cap 9 is in contact with the first accommodation groove 81. The groove wall fits and can slide along the groove wall of the first receiving groove 81 . When the EGR valve needs to be opened, the pressure generated by the exhaust gas in the intake passage 7 acting on the valve cap 3 and the pressure generated by the balance cap 9 are equal in magnitude and opposite in direction. Therefore, due to the pressure of the exhaust gas in the intake passage 7 The pressures generated on the valve cap 3 and the balance cap 9 cancel each other out. Therefore, no matter how much the pressure of the exhaust gas in the intake passage 7 is, the action of the valve cap 3 is always realized by the action of the push rod 5, so that the control precision of the opening and closing of the EGR valve is high, and the intake resistance is low, and the intake efficiency is high. Simultaneously, when the engine is under specific working conditions such as idling speed, low speed and small load, cold running or full speed and full load conditions, the exhaust gas in the exhaust passage 8 can only press the valve cap 3 against the intake passage 7 and The joint of the exhaust passage 8 will not enter the intake passage 7 in turn, so it solves the situation in the prior art that the opening of the valve cap and the exhaust gas are in an uncontrollable cycle condition, and will not cause damage to the power source rotor , can prevent the valve cap 3 from being opened passively.

Further, the other end of the push rod 5 is connected to the power source 6, and the power source 6 is arranged at one end of the valve body 1, that is, the power source 6 drives the push rod 5 to move, and the push rod 5 further drives the valve cap 3 and the balance cap 9 to move. Preferably, the power source 6 is a motor, and the control precision is higher.

Further, the main purpose of setting the balance cap 9 is to realize that the pressure generated by the exhaust gas in the intake passage 7 acting on the valve cap 3 and the pressure generated by acting on the balance cap 9 are equal in magnitude and opposite in direction, mainly from two aspects Setting: first, the air intake channel 7 is formed in the first accommodation groove 81, the balance cap 9 is arranged in the first accommodation groove 81, and the balance cap 9 is fixedly connected to the push rod 5, that is, the balance cap 9 and the push rod The rod 5 is fixedly connected; secondly, the valve cap 3 is arranged in the exhaust passage 8 , and the other end of the push rod 5 passes through the intake passage 7 and is fixedly connected with the valve cap 3 . When the exhaust gas enters the intake passage 7, the exhaust gas acts on the surface of the balance cap 9 to generate a certain pressure, and the exhaust gas acts on the surface of the valve cap 3 to generate a certain pressure, and the two pressures are transmitted to the push rod 5 at the same time; when this When the two pressure values are equal, the two pressures transmitted to the push rod 5 can cancel each other out. In physics, F=P*A, F is the size of the pressure on a surface, P is the air pressure value acting on the surface, A is the area of the surface affected by the gas pressure, that is, the pressure on a surface is equal to the action The air pressure value at the surface is multiplied by the area of the surface. It can be predicted that in order to realize that the pressure of the exhaust gas acting on the surface of the valve cap 3 and the pressure of the exhaust gas acting on the surface of the balance cap 9 are equal in size and opposite in direction, it is only necessary to set the surface areas of the valve cap 3 and the balance cap 9 in contact with the air pressure to be equal That is, this method is easy to implement. This arrangement prevents the push rod 5 from the pressure generated by the exhaust gas, so the force driving the valve cap 3 is only realized by the power source 6 controlling the push rod 5 . Correspondingly, as shown in FIG. 2 is a schematic structural diagram of the opening of the EGR valve in the prior art. In FIG. 2, the power source 6' is required to control the downward movement of the push rod 5', and the power source 6' controls the downward movement of the push rod 5'. The force needs to be greater than the pressure of the intake passage 7' acting on the valve cap 3' to realize the opening of the valve cap 3'. Therefore, the control precision of opening and closing of the middle EGR valve in the present invention is high, and the intake resistance is low, and the intake efficiency is high.

Preferably, as shown in FIG. 4 , the intake passage 7 is arranged on the side of the valve body 1 , the exhaust passage 8 is arranged on the bottom surface of the valve body 1 , and the intake passage 7 and the exhaust passage 8 are preferably communicated at right angles. In FIG. 4 , the first accommodating groove 81 is disposed in the air intake passage 7 at a position away from the exhaust passage 8 in the vertical direction. The state shown in Figure 4 is the state where the EGR valve is closed, but it can be foreseen that when the valve cap 3 is opened downwards, that is, when the EGR valve is opened, the exhaust gas enters from the side of the valve body 1 and is discharged from the bottom surface of the valve body 1 , that is, the movement direction (opening direction) of the valve cap 3 away from the end cover 2 is the same as the flow direction of the exhaust gas. In the prior art, as shown in Figure 3, when the engine is under certain working conditions such as idling, low speed and low load, cold running or full speed and full load, the EGR valve needs to be closed, that is, the valve cap 3 needs to be closed. ' is closed, and the exhaust gas pressure in the exhaust passage 8' is very high, the exhaust gas in the exhaust passage 8' will act on the surface of the valve cap 3' in turn, so that the valve cap 3' moves downward. When the exhaust gas in the exhaust channel 8' acts on the surface of the valve cap 3', the force generated is greater than the force of the power source 6' to control the push rod 5' to lift the valve cap 3' upward, the valve cap 3' cannot be closed, and the exhaust gas is circulating. The working conditions are all uncontrollable; even the valve cap 3' will continue to move downward, resulting in damage to the rotor of the power source. In the present invention, as shown in FIG. 4 , no matter how high the pressure of the exhaust gas in the exhaust passage 8 is, the valve cap 3 can only be pressed against the junction of the intake passage 7 and the exhaust passage 8 . Therefore, the technical solution of the present invention solves the situation in the prior art that both the opening of the valve cap and the exhaust gas are uncontrollable in the circulation condition, and will not cause damage to the power source rotor, and can prevent the valve cap 3 from being passively opened.

Further, since the other end of the push rod 5 is fixedly connected to the valve cap 3 through the intake passage 7 and the exhaust passage 8, in order to realize that the gas will not enter the power along the gap between the push rod 5 and the valve body 1 The power source 6 is damaged in the power source 6. Fig. 5 is a partial enlarged view of A in Fig. 4. As shown in Fig. 5, an installation groove is opened on the outer peripheral surface of the balance cap 9, and a sealing ring 91 is embedded in the installation groove. The sealing ring 91 can be attached to the first receiving groove 81 , and when the balance cap 9 slides along the groove wall of the first receiving groove 81 , the sealing ring 91 can ensure the sealing between the balance cap 9 and the first receiving groove 81 . Further, in order to enable the push rod 5 to be driven more smoothly, a second accommodation groove 82 is also provided at the bottom of the first accommodation groove 81, as shown in FIG. The push rod 5 is installed in the shaft sleeve 4 .

Furthermore, in order to realize the fixed connection between the valve cap 3 and the push rod 5 and between the balance cap 9 and the push rod 5, and improve the strength of the overall structure and the rationality of the force, a connecting sleeve 10 is also provided. Fig. 6 is a schematic structural view of the cap body assembly in the EGR valve provided by the present invention. It can be seen from Fig. 6 that the cap body assembly 11 is integrally formed between the valve cap 3 and the balance cap 9 through the connection sleeve 10, and the cross section of the cap body assembly 11 is I-shaped, the push rod 5 passes through the cap body assembly 11 and is fixedly connected with the cap body assembly 11 . The integrally formed cap body assembly 11 has better structural strength and is more convenient to assemble and disassemble. That is, the valve cap 3 and the balance cap 9 can be arranged in a separate structure and fixedly connected with the push rod 5 respectively, or can be arranged in an integrated structure to form a cap body assembly 11 which is fixedly connected with the push rod 5 .

Further, in order to realize that the valve cap 3 can better seal the junction of the intake passage 7 and the exhaust passage 8, an end cover 2 is also provided. In Fig. 4, an end cap 2 is provided at the junction of the intake passage 7 and the exhaust passage 8, the end cap 2 is a ring structure, and the diameter of the inner ring surface of the end cap 2 is smaller than the outer diameter of the valve cap 3, so that the valve cap can be realized 3 abuts against the inner ring surface of the end cover 2 from the side of the exhaust passage 8, so that the valve cap 3 seals the intake passage 7 and the exhaust passage 8. Further, as shown in FIG. 6 , the valve cap 3 includes a connecting portion 31 and a bent portion 32 , the bent portion 32 is arranged on the outer periphery of the connecting portion 31 and forms an included angle with the connecting portion 31 , and the connecting portion 31 is connected to the connecting portion 31 . Set of 10 connections. Therefore, when the valve cap 3 moves, the bent portion 32 arranged at an included angle has an inclined surface, and the inclined surface can abut against the inner ring surface of the end cover 2 to achieve better sealing.

The invention also discloses an engine. By adopting the above-mentioned EGR valve, the engine has high reliability and high intake efficiency.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. a kind of EGR valve, comprising: valve body (1), the valve body (1) is interior to form interconnected inlet channel (7) and exhaust passage (8), the one end of push rod (5) setting in valve body (1), which is characterized in that further include:

Valve cap (3), in exhaust passage (8), one end of the push rod (5) passes through the air inlet for valve cap (3) setting Channel (7) is fixedly connected with the valve cap (3), and the push rod (5) can drive the valve cap (3) by the inlet channel (7) it is sealed with the exhaust passage (8) junction；

Balance cap (9), the inlet channel (7) is interior to form the first holding tank (81), and the balance cap (9) is arranged described first In holding tank (81), the balance cap (9) is fixedly connected on the push rod (5), balance cap (9) circumferential side wall with it is described The cell wall of first holding tank (81) is bonded and can slide along the cell wall of first holding tank (81)；

The interior exhaust gas of the inlet channel (7) acts on the pressure generated on the valve cap (3) and acts on the balance cap (9) The pressure size of upper generation is equal and contrary.

2. EGR valve according to claim 1, which is characterized in that lead between the valve cap (3) and the balance cap (9) Cross connector sleeve (10) and be integrally formed and formed cap body component (11), the push rod (5) be threaded through in the cap body component (11) and with The cap body component (11) is fixedly connected.

3. EGR valve according to claim 2, which is characterized in that the inlet channel (7) and the exhaust passage (8) are even The place of connecing is provided with end cap (2), and the end cap (2) is fixedly connected with the valve body (1), and the valve cap (3) can be with the end cap (2) sealing for realizing the inlet channel (7) and the exhaust passage (8) is abutted.

4. EGR valve according to claim 3, which is characterized in that the end cap (2) is circular ring structure, the end cap (2) Inner ring surface diameter is less than the outer diameter of the valve cap (3), and the valve cap (3) can be with the end cap (2) from exhaust passage (8) side Inner ring surface abut, realize the valve cap (3) by inlet channel (7) and exhaust passage (8) sealing.

5. EGR valve according to claim 1, which is characterized in that the slot bottom of first holding tank (81) is additionally provided with Two holding tanks (82), second holding tank (82) is interior to be provided with axle sleeve (4), and the push rod (5) is threaded through the axle sleeve (4) It is interior.

6. EGR valve according to claim 1, which is characterized in that mounting groove is offered on balance cap (9) outer peripheral surface, It is embedded in the mounting groove sealing ring (91), the sealing ring (91) can be bonded with first holding tank (81).

7. EGR valve according to claim 4, which is characterized in that the valve cap (3) includes interconnecting piece (31) and and bending Portion (32), the bending part (32) are arranged the periphery in the interconnecting piece (31) and are arranged with the interconnecting piece (31) in angle, The interconnecting piece (31) connect with the connector sleeve (10), and the bending part (32) can abut with the inner ring surface of the end cap (2).

8. EGR valve according to claim 3, which is characterized in that movement of the valve cap (3) far from the end cap (2) Direction is identical as the flow direction of exhaust gas.

9. EGR valve according to any one of claims 1 to 8, which is characterized in that the inlet channel (7) is arranged described The side of valve body (1), exhaust passage (8) setting is in the bottom surface of the valve body (1), the inlet channel (7) and the row Gas channel (8) is at right angles connected to.

10. a kind of engine, which is characterized in that use EGR valve described in any one of claim 1-9.