CN105370454A - Anti-icing structure of PCV opening of escape pipe of air cleaner of air inlet system - Google Patents

Abstract

The invention relates to the field of ventilation and air intake of crankcases of automobile engines, in particular to an air outlet pipe structure of an air filter of an air intake system. An anti-icing structure for the PCV port of an air filter outlet pipe of an air intake system. The PCV port naturally extends outward to a PCV port connection section. The PCV joint includes a ventilation pipe section, a joint surface and an air outlet pipe section. The ventilation pipe section and the air outlet pipe section The inner wall of the joint is smoothly transitioned, the joint surface is set at the junction of the ventilation pipe section and the air outlet pipe section, the air outlet pipe section is inserted into the connection section of the PCV port, and the PCV joint is sealed and fixed on the connection section of the PCV port through the joint surface. The inner diameter of the air outlet pipe section is not smaller than the inner diameter of the ventilation pipe section, and the wall thickness of the end face of the ventilation pipe section should be designed to be as thin as possible. The invention prevents the condensed water of the curved pipe from staying at the PCV port by rationally arranging the structure at the interface, without adding additional space and cost, and can avoid the poor ventilation caused by the freezing and blocking of the PCV port, and improve the performance of the vehicle in extremely cold weather. regional operational reliability.

Description

Intake system air filter outlet pipe PCV port anti-icing structure

technical field

The invention relates to the field of ventilation and air intake of crankcases of automobile engines, in particular to an air outlet pipe structure of an air filter of an air intake system.

Background technique

The automobile air intake system and the engine crankcase ventilation system are important systems to maintain the normal operation of the engine, especially the engine crankcase ventilation system. If the ventilation is poor and the pressure is too high, the light ones will cause the oil to become thinner, accelerate deterioration, and poor lubricating performance. Even engine oil overflows from the fuel filler port; severe cases will damage the seal of the crankcase, resulting in oil seal leakage, loss of engine oil leakage, and even the camshaft cap falling off, causing the engine to fail to start; or causing polluted gas to flow into the air filter in reverse, polluting the filter element, etc. Wait. However, in extremely cold regions in winter, the icing of the forced ventilation head (Positive Crankcase Ventilation PCV port) of the air filter outlet pipe is a relatively common fault in many vehicles. The icing and blockage of the PCV port will lead to poor ventilation of the crankcase and excessive pressure. Affect the normal operation and start of the vehicle. For this reason, many designers are looking for various solutions to solve the problem of icing at the PCV port of the air filter outlet pipe, such as adding a liquid storage chamber, using electric heating, etc., all of which require additional auxiliary devices and additional space, which not only increases the cost, but also increases the cost. Also increases the space requirement of the nacelle.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-icing structure for the PCV port of the air filter outlet pipe of the air intake system. The reasonable arrangement prevents the condensed water from the curved pipe from staying in the PCV port, and guides the condensed water from the gas in the PCV pipe to the bottom of the air outlet pipe of the air filter, thereby effectively avoiding the freezing and blocking of the PCV port and improving the vehicle's operating performance in extreme conditions. Reliability for operation in cold regions.

The present invention is achieved as follows: an anti-icing structure for the PCV port of the air filter outlet pipe of the air intake system, including a PCV joint and an air filter outlet pipe, a PCV port is opened on the air filter outlet pipe, and one end of the PCV joint is fixed Installed on the PCV port, the other end of the PCV joint communicates with the crankcase ventilation pipe, and the PCV port naturally extends out of the PCV port connection section, and the PCV joint includes a ventilation pipe section, a joint surface and an air outlet pipe section, and the ventilation pipe section The inner wall at the junction with the air outlet pipe section is smoothly transitioned, the joint surface is set at the junction of the ventilation pipe section and the air outlet pipe section, the air outlet pipe section is inserted into the connection section of the PCV port, and the PCV joint is sealed and fixed through the joint surface On the connection section of the PCV port, the inner diameter of the air outlet pipe section is not smaller than the inner diameter of the ventilation pipe section.

The joint surface is welded and hermetically fixed on the end surface of the top of the connecting section of the PCV port.

The shape of the lower end surface of the air outlet pipe section matches the inner shape of the air filter air outlet pipe.

The length of each position of the outlet pipe section is not greater than the length of the corresponding position of the PCV port connection section.

The anti-icing structure of the PCV port of the air filter outlet pipe of the air intake system of the present invention prevents the condensed water retention of the curved pipe through the rational design of the through hole structure of the PCV joint and the reasonable arrangement of the welding surface on the air filter outlet pipe body and the PCV joint. At the PCV port, the condensed water from the gas in the PCV pipe is led to the bottom of the air filter outlet pipe, thus effectively avoiding the freezing and blocking of the PCV port; compared with the existing structure, no additional space and cost are required , which can avoid poor ventilation caused by freezing and blocking the PCV port, the effect is ideal, the cost performance is high, and the reliability of the vehicle running in extremely cold areas is improved.

Description of drawings

Fig. 1 is the general assembly schematic diagram of the PCV port anti-icing structure of the air filter outlet pipe of the air intake system of the present invention;

Fig. 2 is a schematic diagram of the internal structure of the PCV port anti-icing structure of the air filter outlet pipe of the air intake system of the present invention; the dotted line represents a smooth transition

Fig. 3 is a schematic diagram of the trajectory of the condensed water drop in the present invention.

In the figure: 1 PCV joint, 2 Air filter outlet pipe, 3 Condensed water drop, 11 End surface, 12 Ventilation pipe section, 13 Joint surface, 14 Air outlet pipe section, 15 Lower end surface, 21 PCV port connection section.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

As shown in Figures 1 and 2, an anti-icing structure for the PCV port of the air filter outlet pipe of the air intake system includes a PCV joint 1 and an air filter outlet pipe 2, and a PCV port is opened on the air filter outlet pipe 2, and the One end of the PCV joint 1 is fixedly installed on the PCV port, and the other end of the PCV joint 1 communicates with the crankcase ventilation pipe. The PCV port naturally extends outward to the PCV port connection section 21, and the PCV joint 1 includes a ventilation pipe section 12, a joint surface 13 and the air outlet pipe section 14, the inner wall of the joint between the air outlet pipe section 12 and the air outlet pipe section 14 is smoothly transitioned, the joint surface 13 is set at the junction of the air outlet pipe section 12 and the air outlet pipe section 14, and the air outlet pipe section 14 is inserted into In the PCV port connection section 21, the PCV joint 1 is sealed and fixedly installed on the PCV port connection section 21 through the joint surface 13, the inner diameter of the air outlet pipe section 14 is not less than the inner diameter of the ventilation pipe section 12, and the end surface of the ventilation pipe section 12 top is The wall thickness of 11 should be designed to be as thin as possible, so that the step at the junction with the inner surface of the PCV pipe is as small as possible, so that the condensed water in the PCV pipe is not easy to stay here.

The upper end of the ventilation pipe section 12 is connected to the crankcase ventilation pipe, and the lower end of the air outlet pipe section 14 is inserted into the PCV port connection section 21. The ventilation pipe section 12 and the air outlet pipe section 14 are integrated; the ventilation pipe section 12 is connected to the inner hole of the air outlet pipe section 14 The transition must be smooth to avoid stagnation of condensed water at the transition.

As shown in Figure 3, the structure of the present invention enables the gas in the PCV pipe to enter along the tangential direction of the inner wall of the air filter outlet pipe as much as possible, and the condensed water droplets 3 formed in the PCV joint can only be collected at the lowest point of the lower end, and close to the outlet of the air filter. The wall of the trachea, and as close to the bottom of the pipeline as possible. When the engine is running, the temperature of the wall surface rises rapidly, and even if a little ice slag forms on the inner wall surface, it will be melted and evaporated quickly without clogging.

In the present invention, the joint surface 13 is hermetically fixed on the top end surface of the PCV port connection section 21 . In order to ensure the joint strength, the PCV port connection section 21 must have sufficient wall thickness to seal with the joint surface 13 .

In order to prevent the air outlet pipe section 14 of the PCV connector inserted into the air filter outlet pipe from affecting the gas flow of the air filter outlet pipe, in this embodiment, the shape of the lower end surface 15 of the air outlet pipe section 14 is consistent with the internal shape of the air filter outlet pipe 2 Matching, its shape needs to be obtained according to the shape of the intersection section of the airflow channel of the air filter outlet pipe and the PCV joint; usually, when designing the size, the length of each position of the air outlet pipe section 14 is not greater than the corresponding length of the PCV port connection section 21 The length of the position is such that the extension end is bounded by the PCV port and cannot be exceeded.

Claims (4)

1. a gas handling system air filter steam outlet pipe PCV mouth anti-frozen structure, comprise PCV joint (1) and air filter steam outlet pipe (2), described air filter steam outlet pipe (2) offers PCV mouth, described PCV joint (1) one end is fixedly mounted on PCV mouth, the other end of PCV joint (1) is communicated with crankcase bleed pipe, it is characterized in that: described PCV mouth outwards extends PCV mouth linkage section (21) naturally, described PCV joint (1) comprises ventilation pipeline section (12), mating face (13) and pipeline section of giving vent to anger (14), the inner wall smooth transition of described ventilation pipeline section (12) and pipeline section (14) connection of giving vent to anger, described mating face (13) is arranged on ventilation pipeline section (12) and gives vent to anger pipeline section (14) intersection, described pipeline section of giving vent to anger (14) is inserted in PCV mouth linkage section (21), described PCV joint (1) is fixedly mounted on PCV mouth linkage section (21) by mating face (13) sealing, the internal diameter of described pipeline section of giving vent to anger (14) is not less than the internal diameter of ventilation pipeline section (12).

2. gas handling system air filter steam outlet pipe PCV mouth anti-frozen structure as claimed in claim 1, is characterized in that: described mating face (13) sealing is fixed on the end face at PCV mouth linkage section (21) top.

3. gas handling system air filter steam outlet pipe PCV mouth anti-frozen structure as claimed in claim 1 or 2, is characterized in that: described in the give vent to anger shape of lower end surface (15) of pipeline section (14) match with air filter steam outlet pipe (2) interior shape.

4. gas handling system air filter steam outlet pipe PCV mouth anti-frozen structure as claimed in claim 3, is characterized in that: described in the give vent to anger length of pipeline section (14) each position be not more than the length of PCV mouth linkage section (21) corresponding position.