Pressure relief device for engine cylinder block

Abstract

The invention discloses a pressure relief device for an engine cylinder block. The pressure relief device is used for relieving pressure of the engine cylinder block. The pressure relief device for the engine cylinder block is characterized in that the pressure relief device comprises a cylinder block body, a pressure relief valve, a three-way connector and a pressure sensor; a pressure relief opening is formed in the side face of the air cylinder body and connected with a first connector of the three-way connector. A second connector of the three-way connector is connected with the pressure release valve, and a third connector of the three-way connector is connected with the pressure sensor.

Description

Technical Field

[0001] The present application relates to the field of engines, and in particular to a pressure relief device for an engine cylinder block. Background Art

[0002] During the operation of a traditional engine, due to the open design of the piston ring, it is inevitable that some exhaust gas will accumulate in the crankcase. The exhaust gas includes combustion exhaust gas, water vapor, oil vaporization, etc. The conventional design is that the engine is connected to an oil-gas separator to separate the oil and gas. The oil returns to the oil pan, and the gas returns to the engine intake or is directly discharged into the atmosphere; when in high-altitude and cold areas, the oil-gas separator may be blocked by ice and unable to discharge the gas, causing the gas to be accumulated in the crankcase, resulting in excessive crankcase pressure, which is prone to bursting the cylinder head cover or oil spraying from the oil dipstick. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a pressure relief device for an engine cylinder block, which is used to relieve pressure on the engine cylinder block.

[0004] The technical solution provided in this application is described below:

[0005] The present application provides a pressure relief device for an engine cylinder block, characterized in that the pressure relief device comprises:

[0006] Cylinder body, pressure relief valve, tee connector and pressure sensor;

[0007] A pressure relief port is arranged on the side of the cylinder body, and the pressure relief port is connected to the first interface of the three-way joint;

[0008] The second interface of the three-way connector is connected to the pressure relief valve, and the third interface of the three-way connector is connected to the pressure sensor.

[0009] Optionally, the pressure sensor is data-connected to an engine controller so that the pressure sensor feeds back the pressure state inside the cylinder body to the engine controller.

[0010] Optionally, when the pressure sensor detects that the internal pressure of the cylinder body reaches a preset value, a cylinder body pressure abnormality prompt is triggered.

[0011] Optionally, the pressure relief valve is a one-way pressure relief valve, and a spring is arranged inside the pressure relief valve, and the spring is used to lock the pressure relief valve so that when the internal pressure of the pressure relief valve reaches the elastic force limit of the spring, the pressure relief valve is compressed to open the pressure relief valve.

[0012] Optionally, the crankcase is provided with an oil dipstick inlet, the oil dipstick is connected to the outside of the engine, the oil dipstick is sealed with the crankcase by means of a sleeve seal, and the elastic force of the spring is less than the pressure required for the sleeve of the oil dipstick to pop out.

[0013] Optionally, the pressure relief valve is connected to the air intake pipe via a hose.

[0014] Optionally, the cavity below the cylinder body is a crankcase, the crankcase is connected to the cylinder head cover through an exhaust pipe, the cylinder head cover is provided with a crankcase air outlet, and the crankcase air outlet is connected to an oil-gas separator.

[0015] Optionally, the pressure relief port is arranged on the crankcase side wall at the lower part of the cylinder body.

[0016] Optionally, the pressure relief valve is threadedly connected to the pressure relief port, the pressure sensor is threadedly connected to the three-way joint, and the three-way joint is threadedly connected to the pressure relief valve.

[0017] Optionally, the pressure relief valve is connected to an air intake pipe of the cylinder body.

[0018] It can be seen from the above technical solutions that this application has the following advantages:

[0019] The present application sets a pressure relief port on the cylinder body and limits the pressure relief of the pressure relief port through a pressure relief valve, so that when the air pressure inside the cylinder body is lower than the tolerance value of the pressure relief valve, the cylinder body circulates normally, but when the air pressure inside the cylinder body is higher than the tolerance value of the pressure relief valve, the pressure relief valve will open to discharge the gas inside the cylinder body, thereby achieving the purpose of reducing the internal pressure of the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of an exploded view of a pressure relief device for an engine cylinder block in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a cylinder head cover for a pressure relief device of an engine cylinder block in an embodiment of the present application;

[0023] Figure 3 It is a structural schematic diagram of a pressure relief device for an engine cylinder block in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In the present invention, the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation directions of the various components or components.

[0025] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0026] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] See also Figures 1 to 3 The present application first provides an embodiment of a pressure relief device for an engine cylinder block, the embodiment comprising:

[0030] Cylinder body 1, pressure relief valve 2, three-way joint 3 and pressure sensor 4;

[0031] A pressure relief port 11 is provided on the side of the cylinder body 1, and the pressure relief port 11 is connected to the first interface 31 of the three-way joint 3;

[0032] The second interface 32 of the three-way connector 3 is connected to the pressure relief valve 2 , and the third interface 33 of the three-way connector 3 is connected to the pressure sensor 4 .

[0033] The bottom of the cylinder body is used to carry the crankshaft, so it is called the crankcase. In the actual operating state, the cylinder body seals the part where the cylinder runs through the piston ring during operation, but the actual operating state will cause the gas generated by the cylinder during operation to overflow and settle into the crankcase. In actual conditions, the crankcase will be connected to the cylinder head cover, so that the gas in the crankcase enters the oil-gas separator through the crankcase outlet of the cylinder head cover, and the separated gas is reintroduced into the air inlet of the cylinder, so that the separated gas continues to participate in the cylinder combustion, but in a low temperature environment, because the products generated during cylinder combustion include liquids that will be frozen under low temperature conditions, when the engine is running in a low temperature environment, the intermediate connecting component connecting the crankcase and the cylinder head cover and the crankcase outlet 5 set on the cylinder head cover are at risk of being frozen and blocked, resulting in the gas in the crankcase being unable to be released, thereby causing the oil dipstick to be stretched open, but in a low temperature environment, the oil dipstick is likely to be frozen, which in turn causes the cylinder head cover to rupture.

[0034] The pressure sensor 4 is data-connected to the engine controller so that the pressure sensor 4 feeds back the pressure state inside the cylinder body to the engine controller.

[0035] In the present application, a pressure relief port 2 is arranged at the lower part of the side wall of the cylinder body 1, and the pressure relief port 2 is connected to the pressure relief valve 2 and the pressure sensor 44 through a three-way valve. The pressure state of the crankcase at the lower part of the cylinder body is monitored by the pressure sensor 44, and the monitoring data obtained by the pressure sensor 44 will be sent to the engine controller (hereinafter referred to as ECU) in the form of data transmission. The data transmission mode between the pressure sensor 4 and the ECU is wired transmission and wireless transmission. In the wired transmission state, the pin of the pressure sensor 4 is directly connected to the ECU by wire, and in the wireless transmission state, the pressure sensor 44 is connected to the wireless transmission module arranged near the cylinder body, so that the data is fed back to the wireless transmission module and then sent to the ECU through the wireless transmission module.

[0036] Among them, when the pressure relief valve 2 and the pressure sensor 44 are respectively connected through the three-way joint 3, the pressure relief valve 2 is tightly closed and the gas inside the cylinder body 1 and the crankcase will not leak from the pressure relief valve, so that the air pressure detected by the pressure sensor 44 is the internal air pressure data of the cylinder body.

[0037] When the pressure sensor 4 detects that the internal pressure of the cylinder body 1 reaches a preset value, a cylinder body pressure abnormality prompt is triggered.

[0038] Specifically, the condition for the pressure sensor 4 to trigger an abnormal state is that the detected air pressure inside the cylinder body 1 reaches a preset value. In addition, there is another detection method that triggers abnormal feedback when the internal pressure decreases when the pressure relief valve 2 is opened. That is, during the detection of the internal air pressure of the cylinder body 1 by the pressure sensor 4, the internal air pressure begins to increase and reaches the pressure relief threshold of the pressure relief valve 2, and then the pressure drops, which will trigger abnormal feedback.

[0039] The pressure relief valve 2 is a one-way pressure relief valve, and a spring is arranged inside the pressure relief valve 2. The spring is used to lock the pressure relief valve 2 so that when the internal pressure of the pressure relief valve 2 reaches the elastic force limit of the spring, the pressure relief valve 2 is compressed to open the pressure relief valve 2.

[0040] Because the pressure relief valve 2 is a one-way valve and a spring is provided therein, the actual condition for the pressure relief valve 2 to open is that the pressure generated by the air pressure inside the cylinder body 1 is sufficient to lift the spring of the pressure relief valve 2. Therefore, when the pressure relief valve 2 is lifted up to perform the pressure relief action, the air pressure inside the cylinder body 1 will decrease, but at the same time it indicates that the air pressure state inside the cylinder body 1 has reached a critical value.

[0041] The elastic strength of the spring is selected according to the engine requirements, and its purpose is to release the pressure before the internal air pressure of the cylinder body 1 reaches a critical value.

[0042] The crankcase is provided with an oil dipstick inlet, the oil dipstick is connected to the outside of the engine, the oil dipstick is sealed by the crankcase through a sleeve seal, and the elastic force of the spring is less than the pressure required for the sleeve of the oil dipstick to pop out.

[0043] The dipstick inlet is one end of the dipstick tube, which is inserted into the oil pan and used to measure the amount of oil in the crankcase. The dipstick inlet allows the user to pull out the dipstick to check the oil level. The dipstick is connected to the outside of the engine through the dipstick tube, allowing the user to pull out the dipstick from the outside of the engine to check the oil level. The seal between the dipstick and the dipstick tube is usually achieved by an O-ring or a rubber seal to ensure that during the insertion and removal of the dipstick, the oil and gas in the crankcase will not leak into the atmosphere and cause pollution. The spring used in the fixing structure of the dipstick tube is designed to have a spring force less than the pressure required for the dipstick tube sleeve to pop out, to ensure that the dipstick tube will not accidentally pop out due to vibration during engine operation, and to maintain the reliability of fixing and sealing.

[0044] The pressure relief valve 2 is connected to the air intake pipe via a hose.

[0045] The intake pipe connected to the pressure relief valve 2 will guide the high-pressure gas in the crankcase discharged from the pressure relief valve 2 back to the intake system to prevent the engine from being damaged due to excessive pressure.

[0046] Optionally, the cavity below the cylinder body 1 is a crankcase, the crankcase is connected to the cylinder head cover through an exhaust pipe, the cylinder head cover is provided with a crankcase air outlet 5, and the crankcase air outlet 5 is connected to an oil-gas separator.

[0047] The crankcase is the main space in the engine for accommodating the crankshaft. It also serves as a storage room for the engine oil. When the engine is working, a mixture of some combustion exhaust gas, water vapor and engine oil vapor will be generated inside the crankcase due to incomplete sealing between the piston ring and the cylinder wall.

[0048] The exhaust pipe is a passage connecting the crankcase and the cylinder head cover. It is used to discharge the gas in the crankcase and to control and release the pressure in the crankcase to prevent engine damage due to pressure accumulation.

[0049] The pressure relief port is arranged on the crankcase side wall at the lower part of the cylinder body 1 .

[0050] The cylinder head cover covers the top of the cylinder head, protects the top of the engine from foreign matter intrusion, and provides sealing. The cylinder head cover is provided with a crankcase gas outlet 5, which is an outlet specially designed to discharge the gas in the crankcase.

[0051] The crankcase outlet 5 is an opening on the cylinder head cover, which is connected to the exhaust pipe to discharge the gas in the crankcase. The design of the crankcase outlet 5 is very important for controlling the pressure in the crankcase and reducing pollutant emissions.

[0052] The oil-gas separator connected to the crankcase outlet 5 is used to separate the engine oil and other gases in the crankcase exhaust gas. The function of the oil-gas separator is to separate the engine oil from the mixed gas and return it to the oil pan, while discharging the gas (such as combustion exhaust gas, water vapor, etc.) into the atmosphere or re-introducing it into the intake system.

[0053] Specifically, the exhaust gas and steam generated when the engine is working enter the oil-gas separator through the crankcase outlet 5, and the oil and gas are separated in the oil-gas separator. The oil flows back to the oil pan, and the gas is discharged to the atmosphere or re-enters the intake system according to the system design. Such a design helps to reduce the internal pressure of the engine, prevent oil leakage, protect the environment, and improve the working efficiency of the engine.

[0054] The pressure relief valve 2 is connected to the pressure relief port via threads, the pressure sensor 4 is connected to the three-way connector 3 via threads, and the three-way connector is connected to the pressure relief valve 2 via threads.

[0055] Threaded connections can achieve good sealing effects, especially in applications involving pressure and fluid control. By using appropriate sealing materials (such as O-rings, gaskets, etc.), threaded connections can prevent gas or liquid leakage and ensure the safety and environmental protection of the system. Threaded connections allow quick installation and disassembly, which is convenient for maintenance and replacement of parts. This connection method does not require complex tools or techniques, which can simplify the assembly process and reduce maintenance costs. Threaded connections allow the various components (pressure relief valve 2, pressure sensor 4, tee connector 3) to be designed and optimized as a whole system. This integration helps to improve the performance and reliability of the entire system.

[0056] The pressure relief valve 2 is connected to the air intake pipe of the cylinder body 1 .

[0057] The pressure in the crankcase can be controlled by connecting the pressure relief valve 2 to the intake pipe. When the pressure in the crankcase exceeds the set value, the pressure relief valve 2 will open to release the excess pressure to prevent damage to engine components due to excessive pressure.

[0058] The oil-gas mixture in the crankcase enters the intake pipe through the pressure relief valve 2 and is then directed to the oil-gas separator. There, the engine oil and gas are separated, the engine oil is recycled, and the gas can be reintroduced into the intake system or discharged into the atmosphere. By reintroducing the gas in the crankcase into the intake system to participate in combustion, the pollutants directly discharged into the atmosphere can be reduced, reducing the impact on the environment. Preventing oil leakage or cylinder head cover rupture due to excessive crankcase pressure protects the engine from damage.

[0059] It can be seen from the above technical solutions that this application has the following advantages:

[0060] The present application sets a pressure relief port on the cylinder body 1 and limits the pressure relief of the pressure relief port through the pressure relief valve 2, so that when the internal air pressure of the cylinder body 1 is lower than the tolerance value of the pressure relief valve 2, the cylinder body circulates normally, but when the internal air pressure is higher than the tolerance value of the pressure relief valve 2, the pressure relief valve 2 will open to discharge the gas inside the cylinder body 1, thereby achieving the purpose of reducing the internal pressure of the cylinder body 1.

[0061] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

Claims

1. A pressure relief device for an engine cylinder block, characterized in that: The pressure relief device comprises: Cylinder body, pressure relief valve, tee connector and pressure sensor; A pressure relief port is arranged on the side of the cylinder body, and the pressure relief port is connected to the first interface of the three-way joint; The second interface of the three-way connector is connected to the pressure relief valve, and the third interface of the three-way connector is connected to the pressure sensor.

2. The pressure relief device according to claim 1, characterized in that: The pressure sensor is data-connected to an engine controller so that the pressure sensor feeds back the pressure state inside the cylinder body to the engine controller.

3. The pressure relief device according to claim 2, characterized in that: When the pressure sensor detects that the internal pressure of the cylinder body reaches a preset value, a cylinder body pressure abnormality prompt is triggered.

4. The pressure relief device according to claim 1, characterized in that: The pressure relief valve is a one-way pressure relief valve, and a spring is arranged inside the pressure relief valve. The spring is used to lock the pressure relief valve so that when the internal pressure of the pressure relief valve reaches the elastic force limit of the spring, the pressure relief valve is compressed to open the pressure relief valve.

5. The pressure relief device according to claim 3, characterized in that: The crankcase is provided with an oil dipstick inlet, the oil dipstick is connected to the outside of the engine, the oil dipstick is sealed by the crankcase through a sleeve seal, and the elastic force of the spring is less than the pressure required for the sleeve of the oil dipstick to pop out.

6. The pressure relief device according to any one of claims 1 to 5, characterized in that: The pressure relief valve is connected to the air intake pipe through a hose.

7. The pressure relief device according to any one of claims 1 to 5, characterized in that: The cavity below the cylinder body is a crankcase, and the crankcase is connected to the cylinder head cover through an exhaust pipe. The cylinder head cover is provided with a crankcase air outlet 5, and the crankcase air outlet 5 is connected to an oil-gas separator.

8. The pressure relief device according to any one of claims 1 to 5, characterized in that: The pressure relief port is arranged on the crankcase side wall at the lower part of the cylinder body.

9. The pressure relief device according to any one of claims 1 to 5, characterized in that: The pressure relief valve is connected to the pressure relief port via threads, the pressure sensor is connected to the three-way joint via threads, and the three-way interface is connected to the pressure relief valve via threads.

10. The pressure relief device according to any one of claims 1 to 5, characterized in that: The pressure relief valve is connected to the air intake pipe of the cylinder body.

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