A dual valve controlled PRV valve

Abstract

This invention relates to the field of automotive parts technology, and provides a dual-valve controlled PRV valve, comprising: a valve seat having an intake chamber and an exhaust chamber therein, the intersection of which forms a cavity with one end communicating with the outside air; a piston movably inserted into the cavity, with an exhaust hole penetrating the first and second parts at the center of the piston; a diaphragm movably connected to the upper end of the piston; a spring sleeved on the outer wall of the piston, with the end of the spring abutting against the diaphragm on the moving side; and a seal disposed within the cavity. Compared with the prior art, the advantage of this invention is that by providing a seal within the valve seat that seals the piston and the cavity, when the negative pressure in the cavity is high, the seal and the diaphragm together achieve a seal on the intake and exhaust chambers. Under the same operating conditions, this makes it easier to achieve the sealing function, preventing excessively low crankcase negative pressure and ensuring normal engine starting.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a dual-valve controlled PRV valve. Background Technology

[0002] The crankcase is the most important component of an engine, a hollow structure that houses the crankshaft. In most engines, it's located at the bottom. The crankshaft is a shaft with cranks that rotates around its axis when the engine is running. Connected to the connecting rods, the crankshaft converts the reciprocating motion of the pistons into its own rotation, thus driving the vehicle. The crankcase is equipped with a PRV valve (crankcase pressure relief valve), integrated into the crankcase, used to reduce the internal pressure. Gases discharged from the crankcase pass through this PRV valve into the ventilation duct and finally into the intake manifold. The function of the PRV valve on the engine is pressure relief. When the pressure inside equipment or pipelines exceeds the set pressure, it automatically opens to relieve pressure, ensuring that the pressure of the medium inside the equipment and pipelines remains below the set pressure, protecting the equipment and pipelines and preventing accidents.

[0003] A traditional PRV valve typically includes a PRV valve cover, a PRV diaphragm, a linear spring, and a valve seat. Its working principle is as follows: The cavity between the upper part of the PRV diaphragm and the PRV valve cover is open to the outside, with atmospheric pressure. The vacuum level at the lower part of the PRV diaphragm, especially at the outlet, varies with engine load. When the vacuum level at the outlet is high, the pressure difference between the upper and lower sides of the PRV diaphragm increases, pushing the PRV diaphragm towards the outlet. To prevent the outlet from being completely blocked by the PRV diaphragm, a compression spring (linear spring) is usually placed between the PRV diaphragm and the outlet. When the car starts, a large negative pressure is generated at the low-load outlet of the PRV valve. The greater the compression required for the diaphragm to close, the greater the counterforce generated by the linear spring. During the diaphragm closing process, when the inlet positive pressure, the counterforce generated by the linear spring, and the low-load outlet negative pressure of the PRV valve are equal, the PRV valve is in a state of dynamic balance and cannot close. At this time, a large negative pressure is generated inside the crankcase, which will reduce engine power, increase fuel and oil consumption, and make starting difficult. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-valve controlled PRV valve to prevent excessively low negative pressure in the crankcase, in light of the current state of the prior art.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a dual-valve controlled PRV valve is proposed, comprising: a valve seat, which is provided with an air inlet chamber and an air outlet chamber, wherein the intersection of the air inlet chamber and the air outlet chamber forms a cavity that is connected to the outside air at one end, and the cavity has a large end connected to the air inlet chamber and a small end connected to the air outlet chamber.

[0006] A piston is movably inserted into the cavity. The piston has a first part movably disposed at the large end of the cavity and a second part movably inserted at the small end of the cavity. An air outlet is provided in the middle of the piston, penetrating the first part and the second part.

[0007] A diaphragm is movably connected to the upper end of the piston and seals the cavity from the outside air. The diaphragm can close the air outlet by pressing against the piston due to the negative pressure in the cavity.

[0008] A spring is sleeved on the outer wall of the piston, and the end of the spring moves against the diaphragm on the side facing the piston.

[0009] A sealing element is disposed within the cavity. The sealing element can form a seal between the piston and the cavity due to the compression of the piston, and together with the diaphragm, isolates the air inlet cavity from the air outlet cavity.

[0010] In the aforementioned dual-valve controlled PRV valve, the sealing element includes:

[0011] A sealing ring is fitted onto the outer side wall of the second part of the piston and movably abuts against the end of the first part of the piston;

[0012] The valve core has a mounting surface at the small end of the cavity facing the air outlet cavity. One end of the valve core is movably inserted into the mounting surface, and the upper end of the valve core movably abuts against the lower end of the piston.

[0013] In the aforementioned dual-valve controlled PRV valve, a plurality of through grooves communicating with the air outlet are provided on the side wall of the first part of the piston.

[0014] In the aforementioned dual-valve controlled PRV valve, a plurality of limiting protrusions are formed on the side wall of the cavity around the piston in the circumferential direction. The plurality of limiting protrusions are arranged around the spring to prevent the spring from tilting.

[0015] In the aforementioned dual-valve controlled PRV valve, a mounting plate is provided at the end of the valve core away from the piston, and a mounting hole is provided on the mounting surface. The mounting hole can be enlarged when the mounting plate is inserted to allow the mounting plate to pass through, and can be elastically reset when the mounting plate crosses over, so as to prevent the valve core from disengaging from the mounting surface when the mounting plate is engaged in the mounting hole.

[0016] Compared with the prior art, the advantage of the present invention is that by setting a sealing piston and a sealing element in the valve seat, when the negative pressure in the chamber is large, the sealing element and the diaphragm together achieve the sealing of the intake chamber and the exhaust chamber. Under the same working conditions, it is easier to achieve the sealing function, prevent the crankcase negative pressure from being too low, and ensure the normal starting of the engine. Attached Figure Description

[0017] Figure 1 This is the floor plan of this application;

[0018] Figure 2 yes Figure 1 Sectional view along the middle AA direction;

[0019] Figure 3 This is a three-dimensional view of the valve seat structure;

[0020] Figure 4 It is a 3D diagram of a piston.

[0021] In the diagram, 1. Valve seat; 2. Inlet chamber; 3. Outlet chamber; 4. Container; 5. Large end; 6. Small end; 7. Piston; 8. Outlet port; 9. First part; 10. Second part; 11. Diaphragm; 12. Spring; 13. Sealing ring; 14. Valve core; 15. Through groove; 16. Limiting protrusion; 17. Mounting platform. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figures 1 to 4 As shown, a dual-valve controlled PRV valve of the present invention includes: a valve seat 1, which has an inlet chamber 2 and an outlet chamber 3 therein, and the intersection of the inlet chamber 2 and the outlet chamber 3 forms a cavity 4 with one end communicating with the outside air. The cavity 4 has a large end 5 communicating with the inlet chamber 2 and a small end 6 communicating with the outlet chamber 3; a piston 7, which is movably inserted into the cavity 4, and the piston 7 has a first part 9 movably disposed at the large end 5 of the cavity 4 and a second part 10 movably inserted at the small end 6 of the cavity 4. A through-hole is provided in the middle of the piston 7 through the first part. 9 and the air outlet 8 of the second part 10; diaphragm 11, which is movably connected to the upper end of piston 7 and seals the cavity 4 from the outside air. The air outlet 8 can be closed by the negative pressure in the cavity 4 and the piston 7; spring 12, which is sleeved on the outer wall of piston 7 and the end of spring 12 moves against the side of diaphragm 11 facing piston 7; sealing element, which is disposed in the cavity 4. The sealing element can form a seal between piston 7 and cavity 4 due to the compression of piston 7, and together with diaphragm 11, isolates air inlet cavity 2 from air outlet cavity 3.

[0024] When the negative pressure in the cavity 4 is large, the piston 7, which is movable in the cavity 4, will move along the diaphragm 11 under the pressure of the diaphragm 11. Figure 2As shown, the piston moves up and down. During the movement of the piston 7, the piston 7 squeezes the seal, causing the seal to form a seal between the outer wall of the piston 7 and the small end 6 of the cavity 4, thus isolating the intake chamber 2 from the exhaust chamber 3. Compared with the prior art, which only uses a diaphragm 11 to isolate the intake chamber 2 from the exhaust chamber 3, the sealing device in this solution, while achieving the sealing of the PRV valve, can reduce the pressure of the diaphragm 11 on the spring 12, preventing the PRV valve from becoming dynamically unbalanced and unable to close, thereby preventing the generation of a large negative pressure inside the crankcase and ensuring the normal starting of the engine.

[0025] Specifically, the sealing components include: a sealing ring 13, which is sleeved on the outer side wall of the second part 10 of the piston 7 and moves against the end of the first part 9 of the piston 7; a valve core 14, with a mounting surface provided at the small end 6 of the cavity 4 facing the outlet cavity 3, and one end of the valve core 14 is movably inserted into the mounting surface and the upper end of the valve core 14 moves against the lower end of the piston 7.

[0026] The sealing ring 13 is used to seal the piston 7 and the small end 6 of the cavity 4 when it is pressed against the piston 7. The valve core 14 is pressed against the lower end of the piston 7 to reduce the flow of gas entering the outlet cavity 3 through the outlet hole 8, thereby increasing the sensitivity of the piston 7. Under the same working conditions, it is easier to achieve the sealing of the PRV valve.

[0027] Furthermore, the first part 9 of the piston 7 is provided with several through grooves 15 that communicate with the air outlet 8.

[0028] After the grinding disc 11 blocks the air outlet 8 of the piston 7, a through groove 15 is provided on the side wall of the first part 9 of the piston 7, which allows the gas in the cavity 4 to enter the air outlet 8, so that the transition surface between the large end 5 and the small end 6 can be subjected to the pressure of the gas in the cavity 4, thereby increasing the pressure of the piston 7 on the sealing ring 13, making the PRV of this scheme more sensitive.

[0029] Preferably, a plurality of limiting protrusions 16 are formed on the side wall of the cavity 4 around the piston 7 in the circumferential direction. The plurality of limiting protrusions 16 are arranged around the spring 12 to prevent the spring 12 from tilting.

[0030] A mounting plate 17 is provided at the end of the valve core 14 away from the piston 7. A mounting hole is provided on the mounting surface. The mounting hole can be enlarged when the mounting plate 17 is inserted to allow the mounting plate 17 to pass through, and can be elastically reset when the mounting plate 17 crosses over it, so as to prevent the valve core 14 from disengaging from the mounting surface when the mounting plate 17 is engaged in the mounting hole. The mounting plate 17 and the mounting hole can also reduce the size of the gas flow channel between the air inlet chamber 2 and the air outlet chamber 3, and increase the sensitivity of the PRV valve in this solution.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope defined by the spirit of the invention.

Claims

1. A dual-valve controlled PRV valve, characterized in that, include: The valve seat has an air inlet chamber and an air outlet chamber inside. The intersection of the air inlet chamber and the air outlet chamber forms a cavity that is connected to the outside air at one end. The cavity has a large end that is connected to the air inlet chamber and a small end that is connected to the air outlet chamber. A piston is movably inserted into the cavity. The piston has a first part movably disposed at the large end of the cavity and a second part movably inserted at the small end of the cavity. An air outlet is provided in the middle of the piston, penetrating the first part and the second part. A diaphragm is movably connected to the upper end of the piston and seals the cavity from the outside air. The diaphragm can close the air outlet by pressing against the piston due to the negative pressure in the cavity. A spring is sleeved on the outer wall of the piston, and the end of the spring moves against the diaphragm on the side facing the piston. A sealing element is disposed within the cavity. The sealing element can form a seal between the piston and the cavity due to the compression of the piston, and together with the diaphragm, isolates the air inlet cavity from the air outlet cavity. The sealing element includes a sealing ring, which is sleeved on the outer side wall of the second part of the piston and movably abuts against the end of the first part of the piston; The valve core has a mounting surface at the small end of the cavity facing the air outlet cavity. One end of the valve core is movably inserted into the mounting surface, and the upper end of the valve core movably abuts against the lower end of the piston.

2. The PRV valve with dual valve control as described in claim 1, characterized in that, The first part of the piston has a plurality of through grooves on its side wall that communicate with the air outlet.

3. The PRV valve with dual valve control as described in claim 1, characterized in that, Multiple limiting protrusions are formed around the sidewall of the cavity in the circumferential direction around the piston. The multiple limiting protrusions are arranged around the spring to prevent the spring from tilting.

4. The PRV valve with dual valve control as described in claim 1, characterized in that, The valve core is provided with a mounting plate at the end away from the piston. The mounting surface is provided with a mounting hole. The mounting hole can be enlarged when the mounting plate is inserted to allow the mounting plate to pass through, and can be elastically reset when the mounting plate crosses over it, so as to prevent the valve core from disengaging from the mounting surface when the mounting plate is engaged in the mounting hole.

Images