CN215633427U

CN215633427U - EGR (exhaust gas Recirculation) one-way valve and EGR system

Info

Publication number: CN215633427U
Application number: CN202121418259.XU
Authority: CN
Inventors: 李守藏; 李卫; 王俊莉
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-01-25
Anticipated expiration: 2031-06-24

Abstract

The utility model discloses an EGR (exhaust gas recirculation) one-way valve and an EGR system, belonging to the technical field of EGR, wherein the EGR one-way valve comprises a valve seat, the bottom of the valve seat is provided with a water outlet communicated with the outside, the water outlet is connected with a water discharge pipe, an electric control valve is arranged on the water discharge pipe, a liquid level sensor is arranged in the water discharge pipe above the electric control valve, and the electric control valve and the liquid level sensor are respectively and electrically connected with an engine controller; the EGR system comprises an EGR cooler and an EGR pipeline, the EGR pipeline is provided with the EGR one-way valve, condensed water accumulated in the one-way valve can be discharged, the damage of the one-way valve caused by condensed water and icing is prevented, the damage of the one-way valve is avoided, the EGR flow is reduced, and therefore faults such as engine fire, aftertreatment ablation, low measurement accuracy of the humidity sensor and the like are caused.

Description

EGR (exhaust gas Recirculation) one-way valve and EGR system

Technical Field

The utility model belongs to the technical field of EGR (exhaust gas recirculation), and particularly relates to an EGR (exhaust gas recirculation) one-way valve and an EGR system.

Background

With the increasing requirements of emission regulations and the ecological environment of people, the engines with low oil consumption and low emission become the direction of efforts in the industry. The use of EGR (Exhaust Gas Recirculation) can effectively reduce the emission, so that the EGR technology becomes the conventional technical means of the current engine.

An EGR cooler in an EGR system condenses water vapor in the EGR into water and deposits in the gas circuit in the cooler. When the engine runs in a whole vehicle and the engine suddenly changes the working condition (the EGR rate is increased), the moisture accumulated at the bottom of the EGR cooler can be coiled by the suddenly increased EGR flow and is brought into a pipeline behind the cooler. The increase in water content can cause an engine misfire, resulting in methane flowing to the aftertreatment without being combusted, and the high temperature of the aftertreatment can burn the methane resulting in failure of the aftertreatment. Meanwhile, the increase of the water content in the inlet air can seriously reduce the correction precision of the humidity model, so that the measurement is inaccurate, and the precision of a calculation result is influenced.

The existence of the condensed water can also lead the EGR cooler to be corroded, and under the low-temperature condition, the water content in the EGR is too large, so that each part on the EGR pipeline is frozen, the EGR pipeline is blocked, the driving pressure difference of the EGR is reduced, the target EGR rate cannot be reached, and the emission requirement cannot be met. When water surpassed the check valve, freezing that the low temperature caused can damage the check valve diaphragm moreover, and then makes EGR driving capability worsen, the risk greatly increased that catches fire.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the EGR one-way valve and the EGR system can discharge condensed water accumulated in the one-way valve, reduce the water content in EGR and reduce the damage risk.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the EGR one-way valve comprises a valve seat, wherein a water outlet communicated with the outside is formed in the bottom of the valve seat, the water outlet is connected with a water drain pipe, an electric control valve is arranged on the water drain pipe, a liquid level sensor is arranged in the water drain pipe above the electric control valve, and the electric control valve and the liquid level sensor are respectively electrically connected with an engine controller.

Further, the drain opening is located at the lowest point inside the valve seat.

Further, the liquid level sensor is arranged at a position close to the water outlet.

Further, the drain pipe is installed below the exhaust pipe.

Further, the exhaust pipe comprises a tail pipe, and the drain pipe is communicated with the tail pipe behind the supercharger.

Further, the electric control valve is an electromagnetic valve.

Further, the electric control valve is an electric valve.

Further, the EGR check valve further comprises a valve body and a diaphragm, the valve body is fixedly installed in the valve seat, an air inlet and an air outlet are formed in the valve body, and one end of the diaphragm is fixed to the valve body through a fixing bolt while the other end of the diaphragm covers the air outlet.

The EGR system comprises an EGR cooler and an EGR pipeline, wherein the EGR pipeline is provided with the EGR one-way valve.

After the technical scheme is adopted, the utility model has the beneficial effects that:

because the EGR one-way valve comprises a valve seat, the bottom of the valve seat is provided with a water outlet communicated with the outside, the water outlet is connected with a water discharge pipe, an electric control valve is arranged on the water discharge pipe, a liquid level sensor is arranged in the water discharge pipe above the electric control valve, the electric control valve and the liquid level sensor are respectively and electrically connected with an engine controller, when the water amount accumulated at the bottom of the one-way valve reaches a set value, the liquid level sensor transmits an electric signal to the engine controller, the engine controller controls an electromagnetic valve to be opened to discharge the accumulated water through the water discharge pipe, the risk of EGR freezing and damage under the low-temperature condition is reduced, the change of the one-way valve is small, and the arrangement of the whole machine is not influenced.

The EGR system of this application includes EGR cooler and EGR pipeline, is provided with foretell EGR check valve on the EGR pipeline, can discharge the comdenstion water that accumulates in the check valve, prevents the check valve because of the comdenstion water, freeze the damage that leads to, avoids the check valve to damage and causes the EGR flow to reduce to the engine that leads to catches fire, aftertreatment ablation, humidity transducer measurement accuracy are not high fault height.

Drawings

FIG. 1 is a schematic view of an EGR one-way valve of the present invention;

in the figure, 1-valve seat, 2-valve body, 3-diaphragm, 4-fixing bolt, 5-drain pipe, 6-liquid level sensor and 7-electromagnetic valve.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

All directions referred to in the present specification are based on the drawings, and represent relative positional relationships only, and do not represent absolute positional relationships.

The first embodiment is as follows:

as shown in fig. 1, an EGR check valve includes a valve seat, a drain port communicated with the outside is formed in the bottom of the valve seat, the drain port is connected with a drain pipe, an electric control valve is arranged on the drain pipe, a liquid level sensor is arranged in the drain pipe above the electric control valve, and the electric control valve and the liquid level sensor are respectively electrically connected with an engine controller. When the water amount accumulated at the bottom of the one-way valve reaches a set value, the liquid level sensor transmits an electric signal to the engine controller, and the engine controller controls the electric control valve to open to discharge the accumulated water through the drain pipe. The electric control valve may be an electromagnetic valve or an electric valve, and in this embodiment, the electric control valve is preferably an electromagnetic valve.

As shown in fig. 1, the drain port is located at the lowest point inside the valve seat, so that the accumulation of condensed water in the valve seat can be avoided. Wherein, further, level sensor sets up in the position of being close to the outlet.

The drain pipe is arranged below the exhaust pipe, the exhaust pipe is higher in temperature when the engine runs, and the fault that the drain pipe is frozen and cannot drain water normally under the low-temperature condition can be prevented. The exhaust pipe comprises an exhaust tail pipe, the drain pipe is communicated with the exhaust tail pipe behind the supercharger, condensed water is discharged along with tail gas, and the circulation quantity of water in the engine is reduced.

As shown in fig. 1, the EGR check valve further includes a valve body and a diaphragm, the valve body is fixedly installed in the valve seat, the valve body is provided with an air inlet and an air outlet, one end of the diaphragm is fixed to the valve body through a fixing bolt, and the other end of the diaphragm covers the air outlet.

Example two:

the utility model provides a EGR system, includes EGR cooler and EGR pipeline, is provided with the EGR check valve among the embodiment one on the EGR pipeline, can reduce the water content among the EGR system, reduces engine possibility of catching fire and aftertreatment ablation problem, promotes humidity transducer measurement accuracy, reduces under the low temperature condition among the EGR management especially the risk that the check valve freezes and damages.

According to the EGR one-way valve and the EGR system, the drain pipe is arranged at the bottom of the one-way valve, the liquid level sensor and the electric control valve are arranged on the drain pipe, when the water amount accumulated at the bottom of the one-way valve reaches a set value, the electric control valve is controlled by the engine controller to be opened to discharge the accumulated water through the drain pipe, the risk of EGR freezing damage under a low-temperature condition is reduced, the one-way valve is slightly changed, and the arrangement of the whole EGR system is not influenced.

While specific embodiments of the utility model have been described above, it will be understood by those skilled in the art that the described embodiments are only some, and not all, of the present invention, which is presented by way of example only, and the scope of the utility model is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of the utility model, and these changes and modifications all fall within the scope of the utility model.

Claims

1. The EGR one-way valve comprises a valve seat and is characterized in that a water outlet communicated with the outside is formed in the bottom of the valve seat, the water outlet is connected with a water drain pipe, an electric control valve is arranged on the water drain pipe, a liquid level sensor is arranged in the water drain pipe above the electric control valve, and the electric control valve and the liquid level sensor are respectively electrically connected with an engine controller.

2. The EGR check valve of claim 1 wherein the drain opening is located at a lowest point inside the valve seat.

3. The EGR check valve of claim 1 wherein the level sensor is disposed proximate the drain opening.

4. The EGR check valve of claim 1 wherein the drain pipe is mounted below the exhaust pipe.

5. The EGR check valve of claim 4 wherein the exhaust pipe comprises a tail pipe, the drain pipe communicating with the tail pipe after the supercharger.

6. The EGR check valve of claim 1 wherein the electrically controlled valve is a solenoid valve.

7. The EGR check valve of claim 1 wherein the electrically controlled valve is an electrically operated valve.

8. The EGR one-way valve according to any one of claims 1 to 7, further comprising a valve body and a diaphragm, wherein the valve body is fixedly installed in the valve seat, the valve body is provided with an air inlet and an air outlet, one end of the diaphragm is fixed on the valve body through a fixing bolt, and the other end of the diaphragm covers the air outlet.

9. An EGR system comprising an EGR cooler and an EGR line, wherein the EGR line is provided with an EGR check valve as claimed in any one of claims 1 to 8.