CN218543283U - Integrated form check valve structure - Google Patents

Abstract

The utility model provides an integrated form check valve structure belongs to crankcase assembly structure technical field, and this integrated form check valve structure includes bypass pipe and check valve joint. The bypass pipe includes a first link end and a second link end. The check valve joint comprises a valve body, a valve cover, a valve core and a spring, the valve body is provided with a first male joint matched with the connecting end, and the end face of the other end of the valve body in the axis direction is provided with a first mounting hole matched with the valve cover. The valve cover is provided with a second male connector for connecting with the intake manifold, the end of the second male connector is provided with a partition plate, and the partition plate is provided with a connecting through hole. The valve core is arranged in the valve body, and the spring is connected between the valve core and the partition plate. By adopting the integrated one-way valve structure, the natural gas mixed gas in the intake manifold can be prevented from leaking out while the bypass pipeline is disconnected from the intake manifold under the condition that the normal work of the bypass pipeline connected with the intake manifold is not influenced, and the disconnection diagnosis test of the bypass pipeline is ensured to be normally carried out.

Description

Integrated form check valve structure

Technical Field

The utility model relates to a crankcase assembly structure technical field, a special design integrated form check valve structure.

Background

In recent years, with the upgrading of national environmental protection regulations, higher requirements are put on the ventilation of engine crankcases, and breathing systems are arranged in the crankcases of large-scale motor vehicles. The mixed gas discharged from the engine crankcase enters the oil-gas separator through the gas inlet to be filtered, the engine oil flows back to the oil pan, and the waste gas is connected with the gas inlet end of the supercharger through the gas outlet, so that the circular combustion of the waste gas is realized, and the waste gas emission and the environmental pollution are reduced. Meanwhile, large-scale motor vehicles are often equipped with On-Board Diagnostics (OBD) systems, which can detect emission control elements in the engine and generate signals to inform the vehicle owner of the maintenance when a fault occurs.

In the related art, in a conventional closed breathing system, in order to satisfy the negative crankcase pressure at low load, a bypass line is arranged between an outlet of an oil-gas separator and an intake manifold. Because the mixed natural gas is arranged in the air inlet manifold, the conventional breathing system integrates a check valve in the middle of the bypass pipeline to prevent leakage. In the "limit of pollutant emission and measurement method for heavy-duty diesel vehicle", it is clearly specified that the on-board diagnostic system is required to ensure that all detachable pipelines are required to be detected when the crankcase respiratory system is detected and the pipelines are disconnected, namely the bypass pipeline is also required to be detected. And once the check valve in the middle of the intake manifold is disconnected, residual natural gas mixed gas at the joint of the check valve and the intake manifold leaks into the detection rack, so that potential safety hazards are caused, and the on-board diagnosis system cannot perform disconnection diagnosis tests on the bypass pipeline.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an integrated form check valve structure under the condition that does not influence the bypass pipeline normal work of being connected with air intake manifold, can prevent the natural gas mixture among the air intake manifold to leak when bypass pipeline disconnection is connected with air intake manifold, guarantees bypass pipeline's disconnection diagnostic test and normally goes on.

This integrated form check valve structure includes:

a bypass pipe and a one-way valve joint,

the bypass pipe comprises a first connecting end and a second connecting end, wherein the first connecting end is used for being connected with an air inlet manifold of a breathing system of a crankcase of the engine, and the second connecting end is used for being connected with an air outlet of the oil-gas separator;

the check valve joint comprises a valve body, a valve cover, a valve core and a spring, wherein one end of the valve body in the axis direction is provided with a first male joint matched with the first connecting end, the other end face of the valve body in the axis direction is provided with a first mounting hole matched with the valve cover, the valve body is also provided with a first inner hole and a second inner hole, the first mounting hole, the first inner hole and the second inner hole are sequentially connected, the second inner hole is communicated with the inner hole of the first male joint, the diameters of the first mounting hole, the first inner hole and the second inner hole are sequentially reduced,

one end of the valve cover in the axial direction is provided with a second male joint used for being connected with the intake manifold, the outer diameter of the valve cover is the same as the aperture of the first mounting hole, the other end of the valve cover in the axial direction is fixedly connected into the first mounting hole in a threaded connection mode, the end part of the second male joint is provided with a partition plate, the partition plate is provided with a connecting through hole, and the aperture of the connecting through hole is smaller than the inner diameter of the valve cover,

the valve core is arranged in the valve body and comprises a first valve core section and a second valve core section which are sequentially connected, the diameter of the first valve core section is matched with the aperture of the second inner hole, the diameter of the second valve core section is larger than the aperture of the second inner hole and smaller than the aperture of the first inner hole, the first valve core section is located in the second inner hole, the second valve core section is located in the first inner hole, one end of the spring is fixedly connected with the end face of the second valve core section, and the other end of the spring is fixedly connected with the partition plate.

Optionally, the sidewall of the first valve core section has a plurality of strip-shaped grooves arranged along the axial direction of the valve core, and the plurality of strip-shaped grooves are arranged at equal angular intervals along the circumferential direction of the first valve core section.

Optionally, a joint of the first inner hole and the second inner hole is provided with an oblique chamfer, a buffer section is arranged between the first valve core section and the second valve core section, and a chamfer section matched with the oblique chamfer is arranged on a side wall of the buffer section.

Optionally, an end face of the second spool section has a guide flange protruding in an axial direction, the guide flange is coaxial with the second spool section and has a diameter smaller than that of the second spool section, and one end of the spring is sleeved on the guide flange.

Optionally, the first male connector has a limiting flange protruding radially outward, and the limiting flange is spaced from one end face of the valve body in the axial direction.

Optionally, the limit flange has an arc chamfer between the end faces of the two ends in the axial direction of the valve body and the side wall.

Optionally, the integrated form check valve structure still includes the sealing washer, the lateral wall of valve gap has the annular mounting groove, the sealing washer cup joints install in the annular mounting groove.

Optionally, the valve body, the valve cover, the valve core and the spring are all steel structural members.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

when the engine crankcase respiratory system works normally, gas flowing out of the gas outlet of the oil-gas separator enters the bypass pipe from the second connecting end and then enters the valve body through the first connecting end and the inner hole of the first male joint. The pressure value of the conduction of the one-way valve joint is set by adjusting the specification of a spring connected between the inner side of the valve cover partition plate and the valve core. Under the action of the air inlet pressure, the valve core moves to one side of the valve cover along the axial direction of the valve body. The diameter of the first valve core section is slightly smaller than the aperture of the second inner hole, and the diameter of the second valve core section is larger than the aperture of the second inner hole and smaller than the aperture of the first inner hole. When the valve core is pushed by air inflow, after the second valve core section is separated from the end face of the first inner hole, air can enter the first inner hole through a gap generated by separation and finally enters the air inlet manifold through the connecting through hole in the valve cover, and circulation of a respiratory system is realized. When the bypass pipe is required to be directly disassembled from the air inlet manifold and the air outlet of the oil-gas separator for a disconnection diagnosis test, the valve core can abut against the connecting end of the first inner hole and the second inner hole under the elastic action of the spring due to the fact that air does not exist, automatic one-way sealing is achieved, and the residual natural gas mixed gas at the connecting position of the valve core and the air inlet manifold is prevented from being leaked from the valve body. The staff can directly remove the matching connection between the first connecting end and the first male joint, disconnect and take down the connection between the bypass pipe and the air inlet manifold, and perform disconnection diagnosis test on the bypass pipeline by using the on-board diagnosis system.

By adopting the integrated one-way valve structure, the natural gas mixed gas in the intake manifold can be prevented from leaking out while the bypass pipeline is disconnected from the intake manifold under the condition that the normal work of the bypass pipeline connected with the intake manifold is not influenced, and the disconnection diagnosis test of the bypass pipeline is ensured to be normally carried out. Simple structure, easy dismounting, the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic perspective view of an integrated check valve structure cooperating with an intake manifold according to an embodiment of the present invention;

fig. 2 is a front sectional view of the check valve joint according to the embodiment of the present invention;

fig. 3 is a schematic left-side view structure diagram of a check valve joint provided by the embodiment of the present invention;

fig. 4 is a schematic diagram of a right-side view structure of a check valve joint provided by an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

In the related art, in a conventional closed breathing system, in order to meet the negative pressure of the crankcase pressure at low load, a bypass pipeline is arranged between an outlet of an oil-gas separator and an intake manifold. Because mixed natural gas is in the air inlet manifold, the conventional breathing system integrates a check valve in the middle of the bypass pipeline to prevent leakage. In the "limit of pollutant emission and measurement method for heavy-duty diesel vehicle", it is clearly specified that the on-board diagnostic system is required to ensure that all detachable pipelines are required to be detected when the crankcase respiratory system is detected and the pipelines are disconnected, namely the bypass pipeline is also required to be detected. And once the check valve in the middle of the intake manifold is disconnected, residual natural gas mixed gas at the joint of the check valve and the intake manifold leaks into the detection rack, so that potential safety hazards are caused, and the on-board diagnosis system cannot perform disconnection diagnosis tests on the bypass pipeline.

Fig. 1 is a schematic overall structure diagram of an integrated check valve structure provided in an embodiment of the present invention. Fig. 2 is a schematic connection diagram of an integrated check valve structure according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a reinforcing plate of an integrated check valve structure according to an embodiment of the present invention. Fig. 4 is a schematic structural diagram of a main plate of an integrated check valve structure according to an embodiment of the present invention. As shown in fig. 1 to 4, by practice, the applicant has provided an integrated one-way valve structure comprising a bypass pipe 1 and a one-way valve joint 2.

The bypass pipe 1 comprises a first connection end 11 for connection with an intake manifold m of the engine crankcase breathing system and a second connection end 12 for connection with the outlet of the gas-oil separator.

The check valve joint 2 comprises a valve body 21, a valve cover 22, a valve core 23 and a spring 24, wherein one end of the valve body 21 in the axial direction is provided with a first male joint 211 matched with the connecting end, and the other end face of the valve body 21 in the axial direction is provided with a first mounting hole 212 matched with the valve cover 22. The valve body 21 further has a first inner hole 213 and a second inner hole 214 therein, the first mounting hole 212, the first inner hole 213 and the second inner hole 214 are sequentially connected, the second inner hole 214 is communicated with the inner hole of the first male connector 211, and the diameters of the first mounting hole 212, the first inner hole 213 and the second inner hole 214 are sequentially reduced.

One end of the valve cover 22 in the axial direction has a second male joint 221 for connection with the intake manifold m. The outer diameter of the valve cover 22 is the same as the diameter of the first mounting hole 212, and the other end of the valve cover 22 in the axial direction is fixedly connected to the inside of the first mounting hole 212 by means of screw connection. The end of the second male connector 221 has a partition 222, and the partition 222 has a connection through hole 2221, and the diameter of the connection through hole 2221 is smaller than the inner diameter of the valve cover 22.

The spool 23 is disposed inside the valve body 21, and the spool 23 includes a first spool section 231 and a second spool section 232 connected in sequence. The diameter of the first spool section 231 matches the diameter of the second bore 214, and the diameter of the second spool section 232 is larger than the diameter of the second bore 214 and smaller than the diameter of the first bore 213. The first spool section 231 is located in the second bore 214, the second spool section 232 is located in the first bore 213, one end of the spring 24 is fixedly connected with an end face of the second spool section 232, and the other end of the spring 24 is fixedly connected with the partition 222.

The embodiment of the utility model provides an in, this integrated form individual valve structure assembles between the gas outlet and the air intake manifold m of engine crankcase respiratory's oil and gas separator, wherein the second link 12 and the gas outlet pipe connection of oil and gas separator of bypass pipe 1, the first link 11 of bypass pipe 1 is connected through the cooperation of standard part female joint and the first male joint 211 that is located the valve body 21 one end of check valve joint 2, the other end of check valve joint 2 is then connected through the cooperation of the second male joint 221 and the mounting hole that corresponds on the air intake manifold m of valve gap 22 one end. When the engine crankcase respiratory system works normally, gas flowing out of the gas outlet of the oil-gas separator enters the bypass pipe 1 from the second connecting end 12 and then enters the valve body 21 through the first connecting end 11 and the inner hole of the first male joint 211. The pressure value at which the check valve joint 2 is conducted is set by adjusting the specification of the spring 24 connected between the inside of the partition 222 of the bonnet 22 and the valve core 23. The valve body 23 moves toward the bonnet 22 in the axial direction of the valve body 21 by the intake air pressure. Wherein the diameter of the first spool section 231 is slightly smaller than the diameter of the second bore 214, and the diameter of the second spool section 232 is larger than the diameter of the second bore 214 and smaller than the diameter of the first bore 213. When the valve core 23 is pushed by the intake air, and the second valve core section 232 is separated from the end surface of the first inner hole 213, the gas can enter the first inner hole 213 through the gap generated by the separation, and finally enter the intake manifold m through the connecting through hole 2221 on the valve cover 22, so that the circulation of the breathing system is realized. When the bypass pipe 1 needs to be directly detached from the gas outlet of the gas-oil separator and the gas inlet manifold m for a disconnection diagnosis test, the valve core 23 will abut against the connecting end of the first inner hole 213 and the second inner hole 214 under the elastic action of the spring 24 due to the absence of gas inlet, so that automatic one-way sealing is realized, and the residual natural gas mixture at the connecting part of the bypass pipe 1 and the gas inlet manifold m is prevented from leaking from the valve body 21. The worker can directly release the fitting connection between the first connection end 11 and the first male joint 211, disconnect and remove the bypass pipe 1 from the intake manifold m, and perform a disconnection diagnosis test of the bypass pipe 1 using the on-vehicle diagnosis system. By adopting the integrated one-way valve structure, the natural gas mixed gas in the intake manifold m can be prevented from leaking out while the bypass pipeline 1 is disconnected from the intake manifold m under the condition that the normal work of the bypass pipeline connected with the intake manifold m is not influenced, and the disconnection diagnosis test of the bypass pipeline can be ensured to be normally carried out. Simple structure, easy dismounting, the practicality is strong.

Alternatively, the first spool section 231 has a plurality of strip grooves 2311 provided in the axial direction of the spool 23 on the side wall thereof, and the plurality of strip grooves 2311 are arranged at equal angular intervals in the circumferential direction of the first spool section 231. Illustratively, in the present embodiment, 3 strip grooves 2311 are arranged on the sidewall of the first spool segment 231 at equal angular intervals. After the gas flowing out of the gas outlet of the oil-gas separator enters the valve body 21, the gas can preferentially enter the three strip-shaped grooves 2311 and push the valve core 23. When the valve core 23 is pushed by the intake air, and the second valve core section 232 is separated from the end surface of the first inner hole 213, the gas can be divided into three streams to uniformly enter the first inner hole 213 through the gap generated by the separation, and finally enter the intake manifold m through the connecting through hole 2221 on the valve cover 22. Adopt the case 23 of this setting, can shunt the direction to the flow direction of admitting air evenly, improve the stability that gas flows, avoid taking place the card pause because of the atress inequality leads to case 23 to remove in valve body 21. Make gaseous can be fast more smooth and easy let in into air intake manifold m, improved the job stabilization nature of integrated form check valve structure.

Optionally, the junction of the first bore 213 and the second bore 214 has an oblique chamfer 215, the first spool section 231 and the second spool section 232 have a buffer section 233 therebetween, and the buffer section 233 has a chamfer 2331 on the sidewall that matches the oblique chamfer 215. Illustratively, after a long time of operation, the valve core 23 repeatedly separates from and abuts against the connecting ends of the first inner hole 213 and the second inner hole 214 under the action of the elastic force of the spring 24, which is easy to cause abrasion or cause the poor abutment due to the aging of the spring 24, resulting in air leakage. In the embodiment of the present invention, an oblique chamfer 215 is provided at the connection between the first inner hole 213 and the second inner hole 214, and a buffer section 233 corresponding to the oblique chamfer is disposed on the valve element 23. When sealing, the buffer section 233 is in matched and abutted with the inclined chamfer 215 through the inclined chamfer section 2331, so that the contact is smoother, and the collision and damage are avoided. Meanwhile, the contact surface between the valve core 23 and the inside of the valve body 21 is increased when the valve core is abutted, so that the abutting is more sufficient, the generation of gaps is avoided, and the service life and the sealing performance of the integrated one-way valve structure are further improved.

Optionally, the end surface of the second spool section 232 has a guide flange 2321 protruding in the axial direction, the guide flange 2321 is coaxial with the second spool section 232 and has a diameter smaller than that of the second spool section 232, and one end of the spring 24 is sleeved on the guide flange 2321. Exemplarily, in the embodiment of the present invention, through setting up in spring 24 assorted guide flange 2321, after the one end of spring 24 cup joints guide flange 2321, can utilize spring 24's rigidity to carry out spacing direction to case 23, guarantee that it is coaxial with first hole 213 and second hole 214, avoid causing the gas to block up at the skew axis direction of in-process that is promoted by gas, guarantee gaseous smooth and easy circulation, further improved the job stabilization nature of integrated form check valve structure.

Alternatively, the first male coupler 211 has a limit flange 2111 projecting radially outward, and the limit flange 2111 is spaced apart from one end surface of the valve body 21 in the axial direction. Exemplarily, in the embodiment of the present invention, by providing the limit flange 2111 on the first male connector 211, the fitting stroke of the male and female connectors can be stopped and limited when the first male connector 211 is fitted and connected with the first connection end 11, so as to remind the worker that the male connector is already fitted and installed in place, thereby avoiding the damage of the connection part caused by excessive tightening, and improving the practicability of the integrated check valve structure.

Alternatively, the limit flange 2111 has a circular-arc chamfer between both end faces and the side wall in the axial direction of the valve body 21. Exemplarily, in the embodiment of the present invention, by providing the circular arc chamfer on the end surface of the limit flange 2111, the internal thread of the first connection end 11 is prevented from colliding and rubbing with the internal thread to cause damage when contacting with the female connector, thereby further prolonging the overall service life of the integrated check valve structure.

Optionally, the integrated check valve structure further includes a sealing ring 25, an annular mounting groove 223 is formed on an outer side wall of the valve cover 22, and the sealing ring 25 is sleeved and mounted in the annular mounting groove 223. Exemplarily, in the embodiment of the present invention, after the other end of the valve cover 22 is in threaded connection with the valve body 21, the sealing ring 25 can seal the assembly gap that may exist, so as to prevent the natural gas mixture in the intake manifold m from leaking from the assembly gap, thereby further improving the sealing performance of the integrated check valve structure.

Optionally, the valve body 21, the bonnet 22, the valve core 23, and the spring 24 are all steel structural members. Illustratively, in the embodiment of the present invention, the valve body 21, the valve cover 22, and the valve core 23 are made of carbon structural steel, and the spring 24 is made of 304 stainless steel.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

The above description is only an optional embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An integrated one-way valve structure, comprising: a bypass pipe (1) and a one-way valve joint (2),

the bypass pipe (1) comprises a first connecting end (11) connected with an air inlet manifold (m) of an engine crankcase breathing system and a second connecting end (12) connected with an air outlet of the oil-gas separator;

the check valve joint (2) comprises a valve body (21), a valve cover (22), a valve core (23) and a spring (24), wherein one end of the valve body (21) in the axis direction is provided with a first male joint (211) matched with the first connecting end (11), the other end face of the valve body (21) in the axis direction is provided with a first mounting hole (212) matched with the valve cover (22), the valve body (21) is also internally provided with a first inner hole (213) and a second inner hole (214), the first mounting hole (212), the first inner hole (213) and the second inner hole (214) are sequentially connected, the second inner hole (214) is communicated with the inner hole of the first male joint (211), and the diameters of the first mounting hole (212), the first inner hole (213) and the second inner hole (214) are sequentially reduced,

one end of the valve cover (22) in the axial direction is provided with a second male joint (221) used for being connected with the intake manifold (m), the outer diameter of the valve cover (22) is the same as the diameter of the first mounting hole (212), the other end of the valve cover (22) in the axial direction is fixedly connected into the first mounting hole (212) in a threaded connection mode, the end part of the second male joint (221) is provided with a partition plate (222), the partition plate (222) is provided with a connecting through hole (2221), and the diameter of the connecting through hole (2221) is smaller than the inner diameter of the valve cover (22),

the valve core (23) is arranged inside the valve body (21), the valve core (23) comprises a first valve core section (231) and a second valve core section (232) which are connected in sequence, the diameter of the first valve core section (231) is matched with the aperture of the second inner hole (214), the diameter of the second valve core section (232) is larger than the aperture of the second inner hole (214) and smaller than the aperture of the first inner hole (213), the first valve core section (231) is located in the second inner hole (214), the second valve core section (232) is located in the first inner hole (213), one end of the spring (24) is fixedly connected with the end face of the second valve core section (232), and the other end of the spring (24) is fixedly connected with the partition plate (222).

2. The integrated check valve structure according to claim 1, wherein the first spool segment (231) has a plurality of strip grooves (2311) on a side wall thereof, the strip grooves (2311) being provided in an axial direction of the spool (23), the strip grooves (2311) being arranged at equal angular intervals in a circumferential direction of the first spool segment (231).

3. The integrated check valve structure of claim 1, wherein the junction of the first bore (213) and the second bore (214) has an angled chamfer (215), and wherein a relief section (233) is provided between the first spool section (231) and the second spool section (232), and wherein a chamfered section (2331) matching the angled chamfer (215) is provided on a sidewall of the relief section (233).

4. The integrated check valve structure according to claim 1, wherein the end face of the second spool section (232) has a guide flange (2321) which is axially protruded, the guide flange (2321) is coaxial with the second spool section (232) and has a diameter smaller than that of the second spool section (232), and one end of the spring (24) is sleeved on the guide flange (2321).

5. The integrated check valve structure according to claim 1, wherein the first male connector (211) has a position-defining flange (2111) projecting radially outward, the position-defining flange (2111) being spaced from an end surface of the valve body (21) in the axial direction.

6. The integrated check valve structure according to claim 5, wherein the retainer flange (2111) has a rounded chamfer between both end faces and a side wall in the axial direction of the valve body (21).

7. The integrated check valve structure according to claim 1, further comprising a sealing ring (25), wherein an annular mounting groove (223) is formed on an outer side wall of the valve cover (22), and the sealing ring (25) is sleeved and mounted in the annular mounting groove (223).

8. The integrated check valve structure of claim 1, wherein the valve body (21), the valve cover (22), the valve spool (23), and the spring (24) are all steel structural members.

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