A combined valve for realizing exhaust gas recirculation in crankcase

Abstract

The present invention discloses a combination valve for realizing exhaust gas recirculation in a crankcase, comprising a housing 1 of a venturi structure, the housing 1 having a port 1, a port 2 and a port 3 of a three-way structure, the port 1 and the port 2 being coaxially arranged and the port 3 being arranged sideways; the port 1 is connected to the housing 2 for connecting to the engine, the port 2 is connected to the housing 3 for connecting to the supercharger, and a valve core and a spring sleeved on the valve core are arranged between the housing 3 and the housing 1, and the port 3 is connected to the housing 4 for connecting to the crankcase. The combination valve structure provided by the present invention enables a hybrid vehicle with an engine to recirculate the exhaust gas in the crankcase (enter the engine for re-combustion) under certain special working conditions, thereby complying with the National VI emission regulations, and has the following advantages: lower cost, more convenient maintenance, and less space in the vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a combined valve for realizing exhaust gas recirculation in a crankcase. Background Art

[0002] Under certain special working conditions, exhaust gas in the crankcase of a hybrid vehicle with an engine cannot be discharged. The exhaust gas will overflow into the atmosphere, which does not comply with the National VI emission regulations. Other pumps or other electronic control methods are required to recirculate the exhaust gas in the crankcase (enter the engine for re-combustion). Other solutions take up a lot of space in the vehicle and have high costs and maintenance expenses. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a combined valve for realizing exhaust gas recirculation in a crankcase, comprising a housing 1 of a venturi structure, the housing 1 having a port 1, a port 2 and a port 3 of a three-way structure, the port 1 and the port 2 being coaxially arranged and the port 3 being parallelly arranged;

[0004] The port one is connected to the housing two for connecting to the engine, the port two is connected to the housing three for connecting to the supercharger, and a valve core and a spring sleeved on the valve core are arranged between the housing three and the housing one, and the port three is connected to the housing four for connecting to the crankcase.

[0005] Among them, the radial inner wall of the shell is provided with a limiting boss 1 corresponding to the valve core, and the valve core is provided with a limiting boss 2 corresponding to the limiting boss 1, so as to prevent the valve core from blocking the air inlet hole of the shell, so that gas can pass through the valve core even under high pressure.

[0006] Among them, the radial outer sides of the shell 2, the shell 3 and the shell 4 are all provided with an annular groove, and the annular groove is provided with a sealing ring.

[0007] Among them, sealing rings are arranged between the shell 1 and the shell 2, between the shell 1 and the shell 3, and between the shell 1 and the shell 4.

[0008] Through the above technical solution, the combined valve structure provided by the present invention enables a hybrid vehicle with an engine to recirculate the exhaust gas in the crankcase (enter the engine for re-combustion) under certain special working conditions, thereby complying with the National VI emission regulations, which has the following advantages:

[0009] 1. Lower cost than other valve / control solutions;

[0010] 2. Easier maintenance than other valve / control solutions;

[0011] 3. It takes up less space in the vehicle than other valve / control solutions;

[0012] 4. The combination valve can be connected in a variety of ways;

[0013] 5. The combination valve controls the movement of the valve core through the spring to keep the pressure in the crankcase at 0~-10Kpa;

[0014] 6. The limit boss structure of the valve core of the combination valve allows gas to pass through the valve body when the valve body is working at high pressure, but it does not play a desorption role. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0016] Figure 1 A schematic diagram of the disassembled state of the combination valve disclosed in the embodiment;

[0017] Figure 2 It is a schematic diagram of the valve core structure disclosed in the embodiment;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the combination valve disclosed in the embodiment (desorption state);

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the combined valve disclosed in the embodiment (non-desorption state);

[0020] Figure 5 This is a schematic diagram of the system structure after the combination valve is installed.

[0021] The numbers in the figure represent:

[0022] 10. Shell 1; 11. Port 1; 12. Port 2; 13. Port 3; 14. Limiting boss 1; 20. Shell 2; 30. Shell 3; 40. Valve core; 41. Limiting boss 2; 50. Spring; 60. Shell 4. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] Embodiment 1:

[0025] refer to Figure 1-5, the embodiment 1 provides a combination valve for realizing exhaust gas recirculation in a crankcase, comprising a housing 10 of a venturi structure, the housing 10 having a port 11, a port 2 12 and a port 3 13 of a three-way structure, the port 11 and the port 2 12 being coaxially arranged and the port 3 13 being arranged sideways; the port 1 11 is connected to the housing 2 20 for connecting to the engine, the port 2 12 is connected to the housing 3 30 for connecting to the supercharger, and a valve core 40 and a spring 50 sleeved on the valve core 40 are arranged between the housing 3 30 and the housing 10, and the port 3 13 is connected to the housing 4 60 for connecting to the crankcase;

[0026] Among them, the radial inner wall of the shell 10 is provided with a limiting boss 14 corresponding to the valve core 40, and the valve core 40 is provided with a limiting boss 2 41 corresponding to the limiting boss 14 to prevent the valve core 40 from blocking the air inlet hole of the shell 10 and ensure that gas can pass even under high pressure.

[0027] When this embodiment 1 is working:

[0028] refer to Figure 3 and 5 When the intake pressure is less than 60KPa, the intake pressure is insufficient to push the valve core 40 and compress the spring 50 to the bottom. Therefore, the air flow pressure entering the housing 10 is relatively large. The large air flow pressure will use the Venturi structure in the housing 10 to desorb the exhaust gas in the crankcase and inhale it into the engine, so that the pressure in the crankcase remains negative (0 to -10KPa), and the exhaust gas will not overflow, thereby meeting emission regulations.

[0029] refer to Figure 4 When the intake pressure exceeds 60KPa and the working state is reached, the high-pressure airflow will push the valve core 40 and compress the spring 50 to the bottom, thereby limiting the flow of the Venturi structure in the housing 10 through the valve core 40. At this time, under the limitation of the limiting boss 14 and the limiting boss 2 41, there is airflow passing through the Venturi valve, but the flow rate and pressure are relatively small, so it will not play a desorption role, which can avoid the desorption pressure being too large to damage the sealing structure in the crankcase (the pressure range of the crankcase is 0 to -10Kpa), thereby preventing the exhaust gas from overflowing into the atmosphere.

[0030] If there is no valve core 40 structure, the gas pressure after supercharging is too high and may be blown into the crankcase, causing the crankcase pressure to be unable to maintain a negative pressure (0 to -10Kpa), thereby causing the exhaust gas in the crankcase to overflow into the atmosphere.

[0031] Embodiment 2:

[0032] Based on Example 1, in this Example 2, the radial outer sides of shell 2 20, shell 3 30 and shell 4 60 all have annular grooves, and sealing rings are arranged in the annular grooves to ensure the sealing; sealing rings 70 are arranged between shell 1 10 and shell 2 20, between shell 1 10 and shell 3 30, and between shell 1 10 and shell 4 60, so as to ensure the sealing after the shells are connected, and the connection method is not limited to threaded connection, welding and the like.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combination valve for realizing exhaust gas recirculation in a crankcase, characterized in that: A housing (10) comprising a venturi structure, wherein the housing (10) has a port (11), a port (12) and a port (13) of a three-way structure, wherein the port (11) and the port (12) are coaxially arranged and the port (13) is parallelly arranged; The port one (11) is connected to the housing two (20) for connecting to the engine, the port two (12) is connected to the housing three (30) for connecting to the supercharger, and a valve core (40) and a spring (50) sleeved on the valve core (40) are arranged between the housing three (30) and the housing one (10), and the port three (13) is connected to the housing four (60) for connecting to the crankcase.

2. A combined valve for realizing exhaust gas recirculation in a crankcase according to claim 1, characterized in that: The radial inner wall of the shell 1 (10) is provided with a limiting boss 1 (14) corresponding to the valve core (40), and the valve core (40) is provided with a limiting boss 2 (41) corresponding to the limiting boss 1 (14) to prevent the valve core (40) from blocking the air inlet hole of the shell 1 (10), so that gas can pass through the valve core (40) even when the pressure is high.

3. A combined valve for realizing exhaust gas recirculation in a crankcase according to claim 1, characterized in that: The radial outer sides of the shell 2 (20), the shell 3 (30) and the shell 4 (60) are all provided with an annular groove, and a sealing ring is arranged in each of the annular grooves.

4. A combined valve for realizing exhaust gas recirculation in a crankcase according to claim 1, characterized in that: Sealing rings (70) are provided between the shell one (10) and the shell two (20), between the shell one (10) and the shell three (30), and between the shell one (10) and the shell four (60).

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