Combination valve for realizing recirculation of exhaust gas in crankcase

Abstract

The utility model discloses a combination valve for realizing exhaust gas recirculation in a crankcase, which comprises a shell I with a venturi structure, the shell I is provided with a port I, a port II and a port III with a three-way structure, the port I and the port II are coaxially arranged, and the port III is arranged in a paraxial manner; the first port is connected with a second shell used for being connected with an engine, the second port is connected with a third shell used for being connected with a supercharger, a valve element and a spring arranged on the valve element in a sleeving mode are arranged between the third shell and the first shell, and the third port is connected with a fourth shell used for being connected with a crankcase. According to the combination valve structure provided by the utility model, under a certain special working condition of a hybrid vehicle with an engine, waste gas in a crankcase can be subjected to waste gas recirculation (entering the engine to be combusted again) so as to conform to the national sixth emission regulation, and the combination valve structure has the advantages of lower cost, more convenience in maintenance, smaller occupied space in the vehicle and the like.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a combined valve for recirculating exhaust gas in the crankcase. Background Technology

[0002] Hybrid vehicles with engines may experience a situation where exhaust gases cannot be discharged from the crankcase under certain special operating conditions. The exhaust gases will overflow into the atmosphere, which does not meet the China VI emission standards. It is necessary to use other pumps or other electronic control methods to recirculate the exhaust gases in the crankcase (to allow them to re-burn in the engine). Other solutions occupy a lot of interior space and have higher costs and maintenance expenses. Utility Model Content

[0003] To solve the above technical problems, this utility model provides a combined valve for recirculating exhaust gas in the crankcase, including a venturi structure housing 1, the housing 1 having a three-way structure port 1, port 2 and port 3, the port 1 and port 2 being coaxially arranged and the port 3 being off-axis arranged;

[0004] Port 1 is connected to housing 2 for connecting to the engine, port 2 is connected to housing 3 for connecting to the turbocharger, and a valve core and a spring sleeved on the valve core are provided between housing 3 and housing 1. Port 3 is connected to housing 4 for connecting to the crankcase.

[0005] The housing has a limiting boss one corresponding to the valve core on its radial inner sidewall, and the valve core has a limiting boss two corresponding to the limiting boss one, so as to prevent the valve core from blocking the air inlet of the housing and to allow gas to pass through the valve core even under high pressure.

[0006] The outer radial sides of housings two, three, and four each have annular grooves, and each annular groove contains a sealing ring.

[0007] Sealing rings are provided between shell one and shell two, between shell one and shell three, and between shell one and shell four.

[0008] Through the above technical solution, the combined valve structure provided by this utility model enables hybrid vehicles with engines to recirculate exhaust gas from the crankcase (allowing it to re-enter the engine for combustion) under certain special operating conditions, thereby meeting the China VI emission standards. It has the following advantages:

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

[0010] 2. Compared to other valve / control solutions, it is easier to maintain;

[0011] 3. It occupies less interior space compared to other valve / control solutions;

[0012] 4. Combination valves can be connected in multiple ways;

[0013] 5. The combination valve uses a spring to control the movement of the valve core to maintain the pressure inside the crankcase at 0 to -10 kPa;

[0014] 6. The limiting boss structure of the valve core of the combination valve allows gas to still pass through the valve body when the valve body is in a high-pressure working state, but does not play a desorption role. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the disassembled state of the combined valve disclosed in the embodiment;

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

[0018] Figure 3 This is a cross-sectional view of the combined valve disclosed in the embodiment (in the desorbed state);

[0019] Figure 4 This is a cross-sectional view of the combined valve disclosed in the embodiment (in non-desorbed state);

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

[0021] The numbers in the diagram represent:

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

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

[0024] Example 1:

[0025] refer to Figure 1-5This embodiment 1 provides a combined valve for recirculating exhaust gas in the crankcase, including a venturi-structured housing 10. The housing 10 has a three-way structure with port 11, port 22, and port 33. Port 11 and port 22 are coaxially arranged, while port 33 is arranged off-axis. Port 11 is connected to housing 20 for connecting to the engine, port 22 is connected to housing 30 for connecting to the turbocharger, and a valve core 40 and a spring 50 sleeved on the valve core 40 are provided between housing 30 and housing 10. Port 313 is connected to housing 40 for connecting to the crankcase.

[0026] The inner radial sidewall of the housing 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, so as to prevent the valve core 40 from blocking the air inlet of the housing 10 and to ensure that gas can pass through 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 60 kPa, the intake pressure is insufficient to push the valve core 40 and compress the spring 50 to the bottom. Therefore, the airflow pressure entering the housing 10 is relatively large. The large airflow pressure will use the Venturi structure in the housing 10 to play a desorption role, desorbing the exhaust gas in the crankcase and drawing it into the engine, keeping the pressure in the crankcase negative (0 to -10 kPa), preventing exhaust gas from overflowing, and thus meeting emission regulations.

[0029] refer to Figure 4 When the intake pressure exceeds 60 kPa, 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, there is airflow in the venturi valve under the limit of the limiting boss 14 and the limiting boss 21, but the flow rate and pressure are relatively small, so it will not play a desorption role. This can avoid the desorption pressure being too high and damaging the sealing structure in the crankcase (the pressure range in the crankcase is 0 to -10 kPa), thereby preventing the exhaust gas from overflowing into the atmosphere.

[0030] Without the valve core 40 structure, the gas pressure after pressurization may be too high and blown into the crankcase, causing the crankcase pressure to fail to maintain a negative pressure (0 to -10 kPa), thus causing the exhaust gas in the crankcase to overflow into the atmosphere.

[0031] Example 2:

[0032] Based on Embodiment 1, in this Embodiment 2, the radial outer sides of the second housing 20, the third housing 30, and the fourth housing 60 are all provided with annular grooves, and sealing rings are provided in the annular grooves to ensure sealing. Sealing rings 70 are provided between the first housing 10 and the second housing 20, between the first housing 10 and the third housing 30, and between the first housing 10 and the fourth housing 60, thereby ensuring the sealing after the housings are connected. The connection method is not limited to threaded connection, welding, etc.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those 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 is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined valve for recirculating exhaust gas within a crankcase, characterized in that: The housing includes a venturi structure housing 1 (10), the housing 1 (10) having a three-way structure port 1 (11), port 2 (12) and port 3 (13), the port 1 (11) and port 2 (12) being coaxially arranged and the port 3 (13) being off-axis arranged; Port 1 (11) is connected to housing 2 (20) for connecting to the engine. Port 2 (12) is connected to housing 3 (30) for connecting to the turbocharger. A valve core (40) and a spring (50) sleeved on the valve core (40) are provided between housing 3 (30) and housing 1 (10). Port 3 (13) is connected to housing 4 (60) for connecting to the crankcase.

2. The combined valve for recirculating exhaust gas in the crankcase according to claim 1, characterized in that, The inner radial sidewall of the housing (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 (41) corresponding to the limiting boss (14), so as to prevent the valve core (40) from blocking the air inlet of the housing (10) and to allow gas to pass through the valve core (40) under high pressure.

3. The combined valve for recirculating exhaust gas in the crankcase according to claim 1, characterized in that, The outer radial sides of the second (20), third (30) and fourth (60) housings are all provided with annular grooves, and a sealing ring is provided in each of the annular grooves.

4. A combined valve for recirculating exhaust gas in a crankcase according to claim 1, characterized in that, A sealing ring (70) is provided between the first housing (10) and the second housing (20), between the first housing (10) and the third housing (30), and between the first housing (10) and the fourth housing (60).

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