PCV valve convenient to weld

Abstract

The utility model belongs to the field of automobile engine accessories, and particularly relates to a PCV valve convenient to weld, which comprises an upper shell and a lower shell which are coaxially arranged, an annular bulge is arranged at the bottom end of the upper shell, an annular groove is arranged at the top end of the lower shell, the annular bulge and the annular groove can be mutually buckled, a plurality of positioning ribs are uniformly distributed on the outer circle of the annular groove in the circumferential direction, and the positioning ribs are arranged on the outer circle of the annular groove. The positioning ribs can automatically center the upper shell and the lower shell when the upper shell and the lower shell are buckled; a mounting groove is further formed in the bottom end of the upper shell, and an annular valve plate is arranged in the mounting groove; a first spring is arranged in the upper shell, a valve element is arranged in the lower shell, the top end of the valve element penetrates through the valve plate to be located in the upper shell, and the valve element is sleeved with a second spring. The technical problems that an existing PCV valve is prone to single-side welding, and the welding effect is not ideal are solved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile engine accessories, and in particular relates to a PCV valve which is easy to weld. Background Art

[0002] When the engine is working, under high temperature and high pressure conditions, a part of the combustible mixture in the cylinder will leak into the crankcase through the gap between the piston and the cylinder, causing blowby. These blowby gases mix with the engine oil to form a dense colloidal sludge, and then form acidic corrosives. These corrosives will corrode and rust the surface of the bearings inside the engine, accelerate the wear of parts, and cause rust on the working surface of the engine. If they are not discharged in time, the crankcase pressure will increase, causing the lubricating oil to seep out of the oil seal gasket.

[0003] In order to control crankcase emission pollution, make better use of exhaust gas and protect the environment, the PCV valve of the crankcase forced ventilation system is particularly important. Its function is to introduce the gas in the crankcase into the intake manifold through the PCV valve, and a small amount of air enters the intake manifold directly from the air filter through the PCV valve. This avoids ice formation at the throttle, incomplete combustion, emission deterioration, etc., prevents blowby gas from entering the atmosphere, and prevents engine oil deterioration.

[0004] The invention patent with publication number CN 110056658 A discloses a PCV valve, including a first shell, a second shell, a valve seat and a valve core, wherein the first shell and the second shell are connected by ultrasonic vibration welding (i.e., ultrasonic welding). In actual welding operation, there is a gap between the connecting part of the first shell and the second shell, which makes it easy to weld one-sidedly, making the welding effect of the PCV valve unsatisfactory and affecting the production quality of the PCV valve. Utility Model Content

[0005] The utility model aims to provide a PCV valve which is easy to weld, so as to solve the technical problems that the existing PCV valve is easy to weld on one side and the welding effect is not ideal.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A PCV valve that is easy to weld, comprises an upper shell and a lower shell that are coaxially arranged, wherein an annular protrusion is provided at the bottom end of the upper shell, and an annular groove is provided at the top end of the lower shell, the annular protrusion and the annular groove can be engaged with each other, and a plurality of positioning ribs are evenly distributed circumferentially on the outer circumference of the annular groove, and the positioning ribs can make the upper shell and the lower shell automatically centered when they are engaged; an installation groove is also provided at the bottom end of the upper shell, and an annular valve plate is provided in the installation groove; a first spring is provided in the upper shell, and a valve core is provided in the lower shell, the top end of the valve core passes through the valve plate and is located in the upper shell, and a second spring is sleeved on the valve core.

[0008] Furthermore, a boss is provided in the lower shell body, and the bottom end of the valve core is placed on the boss.

[0009] Furthermore, a stepped positioning protrusion is provided at the bottom end of the upper shell, and a positioning groove is provided at the top end of the lower shell, and the positioning groove and the positioning protrusion can be engaged with each other.

[0010] Furthermore, the upper shell includes an inner shell and an outer shell that are integrally arranged, and the first spring is arranged in the inner shell.

[0011] Furthermore, an annular groove is provided on the outer wall of the lower shell body, and a sealing ring is provided in the annular groove.

[0012] Furthermore, the number of the positioning ribs is 6.

[0013] Compared with the prior art, the utility model has the following beneficial technical effects:

[0014] 1. The utility model arranges positioning ribs on the outer circle of the annular groove so that the annular protrusion and the inner wall of the annular groove can fit closely without gap, so that the upper shell and the lower shell are automatically centered during welding, avoiding single-sided welding, ensuring that the upper shell and the lower shell are concentric after welding, and improving the welding effect.

[0015] 2. The utility model sets a boss in the lower shell, and compared with the PCV valve that is flush with the interior of the lower shell, the injection shrinkage of the boss is smaller during the injection molding process, so that when the second spring pushes the valve core downward, the bottom of the valve core can fit tightly on the boss, thereby ensuring the sealing of the interior of the PCV valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the utility model;

[0017] Figure 2 for Figure 1 Cross-sectional view in the AA direction;

[0018] Figure 3 It is a top view of the lower shell of the utility model;

[0019] Figure 4 for Figure 3 Cross-sectional view along the BB direction. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The reference numerals in the drawings of the specification include:

[0022] Upper shell 1, annular protrusion 11, positioning protrusion 12, mounting groove 13, inner shell 14, outer shell 15;

[0023] Lower housing 2, annular groove 21, positioning rib 22, positioning groove 23, boss 24, and slot 25;

[0024] Valve plate 3; first spring 4; valve core 5; second spring 6; sealing ring 7.

[0025] Example

[0026] like Figure 1-4 As shown, a PCV valve that is easy to weld includes an upper shell 1 and a lower shell 2 that are coaxially arranged. The bottom end of the upper shell 1 is formed with an annular protrusion 11 and a step-shaped positioning protrusion 12, and the top end of the lower shell 2 is formed with an annular groove 21 and a positioning groove. The annular protrusion 11 and the annular groove 21 can be interlocked, and the positioning groove and the positioning protrusion 12 can be interlocked. A plurality of positioning ribs 22 are evenly distributed circumferentially on the outer circle of the annular groove 21. The positioning ribs 22 can automatically center the upper shell 1 and the lower shell 2 when they are interlocked. In this embodiment, 6 positioning ribs 22 are arranged, and the positioning ribs 22 are integrally injection molded with the upper shell 1.

[0027] By arranging the positioning ribs 22 on the outer circle of the annular groove 21, the annular protrusion 11 of the upper shell 1 and the inner wall of the annular groove 21 of the lower shell 2 can be closely matched without gap, so that the upper shell 1 and the lower shell 2 are automatically centered during welding, avoiding single-sided welding, ensuring that the upper shell 1 and the lower shell 2 are concentric after welding, and improving the welding effect.

[0028] The bottom end of the upper shell 1 is also formed with a mounting groove 13, and an annular valve disc 3 is installed in the mounting groove 13; the upper shell 1 includes an inner shell 14 and an outer shell 15 formed in one piece, and a first spring 4 is arranged in the inner shell 14; a valve core 5 is arranged in the lower shell 2, and the top end of the valve core 5 passes through the valve disc 3 and is located in the upper shell 1, and a second spring 6 is sleeved on the valve core 5; a boss 24 is formed at the bottom of the lower shell 2, and the bottom end of the valve core 5 is placed on the boss 24; an annular groove 25 is formed on the outer wall of the lower shell 2, and a sealing ring 7 is sleeved in the groove 25.

[0029] By setting the boss 24 in the lower shell 2, the injection shrinkage of the boss 24 is small during the injection molding process, so that when the second spring 6 pushes the valve core 5 downward, the bottom of the valve core 5 can fit tightly on the boss 24 to ensure the sealing inside the PCV valve.

[0030] The specific implementation is as follows:

[0031] The top of the upper shell 1 is connected to the engine intake manifold, and the lower shell 2 is connected to the engine crankcase. When the engine is working, the intake manifold generates negative pressure, so that the pressure in the inner shell 14 is lower than the pressure inside the lower shell 2, and a pressure difference appears at both ends of the valve core 5. The valve core 5 overcomes the elastic force of the second valve core 5 and the gravity of the valve core 5 under the pushing pressure of the gas, and moves from the bottom of the lower shell 2 to the upper shell 1; the mixed exhaust gas in the crankcase enters the inner shell 14 through the gap at the fitting point of the valve core 5 and the valve plate 3, thereby bringing the exhaust gas into the intake manifold and finally participating in the engine combustion; when the engine stops working, the negative pressure in the intake manifold disappears, and under the reverse thrust of the second spring 6 and the gravity of the valve core 5, the valve core 5 falls back and resets to the bottom of the lower shell 2, so that the bottom of the valve core 5 is tightly attached to the boss 24 of the lower shell 2, completing a working cycle.

[0032] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A PCV valve that is easy to weld, characterized in that: It includes an upper shell and a lower shell that are coaxially arranged, the bottom end of the upper shell is provided with an annular protrusion, the top end of the lower shell is provided with an annular groove, the annular protrusion and the annular groove can be engaged with each other, and a plurality of positioning ribs are evenly distributed circumferentially on the outer circle of the annular groove, and the positioning ribs can make the upper shell and the lower shell automatically centered when they are engaged; the bottom end of the upper shell is also provided with a mounting groove, and an annular valve plate is provided in the mounting groove; a first spring is provided in the upper shell, and a valve core is provided in the lower shell, the top end of the valve core passes through the valve plate and is located in the upper shell, and a second spring is sleeved on the valve core.

2. A PCV valve that is easy to weld according to claim 1, characterized in that: A boss is arranged in the lower shell body, and the bottom end of the valve core is placed on the boss.

3. A PCV valve that is easy to weld according to claim 1, characterized in that: The bottom end of the upper shell is also provided with a stepped positioning protrusion, and the top end of the lower shell is also provided with a positioning groove, and the positioning groove and the positioning protrusion can be buckled with each other.

4. A PCV valve that is easy to weld according to claim 1, characterized in that: The upper shell comprises an inner shell and an outer shell which are integrally arranged, and the first spring is arranged in the inner shell.

5. The PCV valve that is easy to weld according to claim 1, characterized in that: An annular groove is arranged on the outer wall of the lower shell body, and a sealing ring is arranged in the annular groove.

6. The PCV valve that is easy to weld according to claim 1, characterized in that: The positioning ribs are provided with 6 pieces.

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