High back pressure exhaust brake valve with pressure-limiting valve

[0016] Example 1:

[0017] like figure 1 It can be seen that the high back pressure exhaust brake valve with a pressure limiting valve includes a cylinder 1 and an exhaust brake valve 2, and the cylinder 1 and the exhaust brake valve 2 are installed together, and is characterized in that: it also includes a limiter Pressure valve 3 and connecting pipe 4, pressure limiting valve 3 is connected with exhaust brake valve 2 through connecting pipe 4, pressure limiting valve 3 is provided with exhaust hole 5.

[0018] When the exhaust brake valve works, the cylinder 1 works, rotates the butterfly valve to the closed position, and the exhaust pipe is blocked. At this time, due to the low engine speed, the exhaust back pressure is also low, and the pressure limiter enters through the connecting pipe 4. The exhaust pressure of valve 3 is not sufficient to open the pressure limiting valve. As the speed of the engine increases, the exhaust back pressure also increases gradually. When it is close to the maximum exhaust back pressure limit that the engine can withstand, the pressure limiting valve 3 is opened and released into the atmosphere through the exhaust hole 5. It should be noted here that when the exhaust brake is working, the engine stops supplying oil, so the exhaust gas is only hot air. According to the layout of the engine, the pressure limiting valve 3 can be arranged in a place with good ventilation and no heat-labile parts around. In this way, the hot air discharged in this way can exchange heat with the atmosphere in a large area, and the temperature of the exhaust gas is rapidly reduced without causing damage to other parts.

[0019] Example 2:

[0020] like figure 2 It can be seen that the pressure limiting valve 3 of the present invention is connected to the exhaust brake valve 2 through the connecting pipe 4 and the connecting pipe 6. The connecting pipe 4 provides a pressure source for the pressure limiting valve 3, and the connecting pipe 6 provides exhaust gas for the pressure limiting valve 3. source. The advantage of this structure is that it can provide a stable and more accurate pressure source, which simplifies the calculation and selection of the spring.

[0021] Example 3:

[0022] like image 3 It can be seen that the pressure limiting valve 3 of the present invention is integrated with the exhaust brake valve 2, the valve body of the pressure limiting valve 3 is integrated with the valve body of the exhaust brake valve, and the valve body of the exhaust brake valve has a bypass opening. Through passage, the inlet of the bypass passage communicates with the exhaust inlet 9 of the exhaust pipe of the exhaust brake valve and is sealed by the pressure limiting valve 3, and the outlet of the bypass passage is connected with the exhaust of the exhaust pipe of the exhaust brake valve. Exit 10 is connected.

[0023] The pressure limiting valve 3 can also be manufactured separately.

[0024] The structure of the present invention is not limited to the above three, and its essence lies in adding a pressure limiting valve to the engine exhaust brake valve, or directly manufacturing the pressure limiting valve and the exhaust brake valve into one body. The function of this pressure limiting valve is to control the exhaust back pressure inside the engine not to exceed the maximum limit that the engine can withstand when the butterfly valve of the exhaust brake valve is closed.