A pressure relief device for an engine cylinder block

Abstract

The application discloses a pressure relief device for an engine cylinder body, which is used for relieving pressure of the engine cylinder body. The device comprises the following: a cylinder body main body, a pressure relief valve, a three-way joint and a pressure sensor; the cylinder body main body is provided with a pressure relief port on the side surface, the pressure relief port is connected with a first interface of the three-way joint; a second interface of the three-way joint is connected with the pressure relief valve, and a third interface of the three-way joint is connected with the pressure sensor.

Description

Technical Field

[0001] This application relates to the field of engines, and more particularly to a pressure relief device for an engine cylinder block. Background Technology

[0002] During the operation of a traditional engine, due to the open design of the piston rings, some exhaust gas inevitably accumulates in the crankcase. This exhaust gas includes combustion exhaust, water vapor, and vaporized engine oil. The conventional design involves connecting the engine to an oil-gas separator to separate the oil and gas. The oil returns to the oil pan, while the gas returns to the intake manifold or is directly discharged to the atmosphere. However, in extremely cold regions, the oil-gas separator may freeze and become blocked, preventing the gas from being discharged. This causes the gas to accumulate in the crankcase, resulting in excessive crankcase pressure. This can easily lead to problems such as the cylinder head cover bursting or oil spraying from the dipstick. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application provides a pressure relief device for engine cylinder blocks, used to relieve pressure in engine cylinder blocks.

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

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

[0006] Cylinder block, pressure relief valve, three-way connector, and pressure sensor;

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

[0008] The second port of the tee is connected to the pressure relief valve, and the third port of the tee is connected to the pressure sensor.

[0009] Optionally, the pressure sensor is connected to the engine controller so that the pressure sensor can feed back the pressure status inside the cylinder block to the engine controller.

[0010] Optionally, when the pressure sensor detects that the internal pressure of the cylinder block has reached a preset value, an abnormal cylinder block pressure warning is triggered.

[0011] Optionally, the pressure relief valve is a one-way pressure relief valve, and a spring is provided 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 spring force limit, it is compressed and thus opens 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 in the crankcase by means of a sleeve seal, and the spring force 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 block 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 outlet, and the crankcase outlet is connected to an oil-gas separator.

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

[0016] Optionally, the pressure relief valve is threadedly connected to the pressure relief port, the pressure sensor is threadedly connected to the tee connector, and the tee connector is threadedly connected to the pressure relief valve.

[0017] Optionally, the pressure relief valve is connected to the intake manifold of the cylinder block body.

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

[0019] This application provides a pressure relief port on the cylinder block and restricts the pressure relief through a pressure relief valve. This allows the cylinder block to circulate normally when the internal air pressure is lower than the pressure relief valve's tolerance. However, when the internal air pressure is higher than the pressure relief valve's tolerance, the pressure relief valve opens to release the gas from the cylinder block, thereby reducing the internal pressure of the cylinder block. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded view of a pressure relief device for an engine cylinder block in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of a cylinder head cover for a pressure relief device used in an engine cylinder block according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of a pressure relief device for an engine cylinder block in an embodiment of this application. Detailed Implementation

[0024] In this invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0025] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Please see Figures 1 to 3 This application first provides an embodiment of a pressure relief device for an engine cylinder block, the embodiment including:

[0030] 1. Cylinder block body; 2. Pressure relief valve; 3. Three-way connector; 4. Pressure sensor;

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

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

[0033] The bottom of the cylinder block is used to support the crankshaft, hence the name crankcase. In actual operation, the cylinder block seals the cylinder's moving parts with piston rings. However, in actual operation, the gas generated by the cylinder overflows and settles into the crankcase. In practice, the crankcase is connected to the cylinder head cover, allowing the gas in the crankcase to enter the oil separator through the crankcase outlet of the cylinder head cover. The separated gas is then reintroduced into the cylinder's intake port, allowing it to continue participating in cylinder combustion. However, in low-temperature environments, because the combustion products in the cylinder include liquids that freeze at low temperatures, the intermediate connecting parts between the crankcase and the cylinder head cover, as well as the crankcase outlet 5 on the cylinder head cover, are at risk of freezing and blocking when the engine is running in low temperatures. This prevents the gas in the crankcase from escaping, causing the dipstick to open. However, in low-temperature environments, the dipstick may freeze, potentially causing the cylinder head cover to burst.

[0034] The pressure sensor 4 is connected to the engine controller so that the pressure sensor 4 can feed back the pressure status inside the cylinder block to the engine controller.

[0035] In this application, a pressure relief port 2 is provided on the lower side wall of the cylinder block body 1. 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 block body is monitored by the pressure sensor 44. The monitoring data acquired by the pressure sensor 44 is transmitted to the engine controller (hereinafter referred to as ECU) in the form of data transmission. The data transmission between the pressure sensor 4 and the ECU can be wired or wireless. In the wired transmission mode, the pins of the pressure sensor 4 are directly connected to the ECU. In the wireless transmission mode, the pressure sensor 44 is connected to a wireless transmission module located near the cylinder block, so that the data is fed back to the wireless transmission module and then sent to the ECU through the wireless transmission module.

[0036] When the pressure relief valve 2 and the pressure sensor 44 are connected respectively through the three-way connector 3, the gas inside the cylinder block 1 and crankcase will not leak from the pressure relief valve when the pressure relief valve 2 is closed, so that the pressure sensor 44 detects the internal pressure data of the cylinder block.

[0037] When the pressure sensor 4 detects that the internal pressure of the cylinder body 1 has reached a preset value, it triggers a cylinder pressure abnormality warning.

[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, which triggers abnormal feedback when the internal pressure decreases when the pressure relief valve 2 is opened. That is, during the process of the pressure sensor 4 detecting the air pressure inside the cylinder body 1, the abnormal feedback will be triggered when the internal air pressure starts to rise and reaches the pressure relief threshold of the pressure relief valve 2 and then the pressure drops.

[0039] The pressure relief valve 2 is a one-way pressure relief valve. A spring is installed 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 spring force limit, it is compressed and thus opens the pressure relief valve 2.

[0040] Because the pressure relief valve 2 is a one-way valve and has a spring installed in it, 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 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 inside the cylinder body 1 has reached the critical value.

[0041] The spring's elastic strength is selected according to the engine's requirements, with the purpose of releasing pressure before the internal air pressure of the cylinder block 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, and the crankcase is sealed by a sleeve seal. The spring force 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 oil dipstick tube, inserted into the oil pan, used to measure the oil level 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 via the dipstick tube, allowing the user to check the oil level from outside the engine. The seal between the dipstick and the dipstick tube is typically achieved using an O-ring or rubber seal to ensure that oil vapors from the crankcase do not leak into the atmosphere and cause pollution during dipstick insertion and removal. The spring used in the dipstick tube's fixing structure is designed with a spring force less than the pressure required for the dipstick tube to pop out, ensuring that the dipstick tube will not accidentally pop out due to vibration during engine operation, maintaining reliable fixing and sealing.

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

[0045] The intake manifold connection to the pressure relief valve 2 guides the high-pressure gas discharged from the crankcase back into the intake system to prevent engine damage due to excessive pressure.

[0046] Optionally, the cavity below the cylinder block 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 outlet 5, and the crankcase outlet 5 is connected to an oil-gas separator.

[0047] The crankcase is the main space in the engine that houses the crankshaft. It also serves as a storage chamber for engine oil. When the engine is running, due to the incomplete seal between the piston rings and the cylinder walls, a mixture of combustion exhaust gases, water vapor, and engine oil vapor is generated inside the crankcase.

[0048] The exhaust pipe is a channel connecting the crankcase and the cylinder head cover. It is used to discharge gas from the crankcase and to control and release the pressure inside the crankcase, preventing engine damage caused by pressure buildup.

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

[0050] The cylinder head cover covers the top of the cylinder head, protecting the top of the engine from foreign objects and providing a seal. The cylinder head cover has a crankcase outlet 5, a specially designed outlet for venting gases from the crankcase.

[0051] Crankcase outlet 5 is an opening on the cylinder head cover that connects to the exhaust pipe, allowing gases to escape from the crankcase. The design of crankcase outlet 5 is crucial for controlling pressure within the crankcase and reducing emissions.

[0052] The oil-gas separator connected to crankcase outlet 5 is used to separate engine oil and other gases from the exhaust gases from the crankcase. The function of the oil-gas separator is to separate engine oil from the gas mixture and allow it to flow back to the oil pan, while releasing gases (such as combustion exhaust gases, water vapor, etc.) into the atmosphere or reintroducing them into the intake system.

[0053] Specifically, exhaust gases and vapors generated during engine operation enter the oil-gas separator through the crankcase outlet 5. The oil-gas separator separates the oil and gases; the oil flows back to the oil pan, while the gases are either released into the atmosphere or re-enter the intake system, depending on the system design. This design helps reduce internal engine pressure, prevent oil leaks, protect the environment, and improve engine efficiency.

[0054] The pressure relief valve 2 is threadedly connected to the pressure relief port, the pressure sensor 4 is threadedly connected to the tee connector 3, and the tee connector is threadedly connected to the pressure relief valve 2.

[0055] Threaded connections provide excellent sealing, especially in applications involving pressure and fluid control. By using appropriate sealing materials (such as O-rings, gaskets, etc.), threaded connections prevent gas or liquid leaks, ensuring system safety and environmental friendliness. Threaded connections allow for quick installation and disassembly, facilitating maintenance and component replacement. This connection method requires no complex tools or techniques, simplifying the assembly process and reducing maintenance costs. Threaded connections allow individual components (pressure relief valve 2, pressure sensor 4, tee fitting 3) to be designed and optimized as a unified system. This integration contributes to improved overall system performance and reliability.

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

[0057] By connecting the pressure relief valve 2 to the intake manifold, the pressure inside the crankcase can be controlled. When the pressure inside the crankcase exceeds a set value, the pressure relief valve 2 will open to release the excess pressure and prevent damage to engine components due to excessive pressure.

[0058] The oil-gas mixture in the crankcase enters the intake manifold through the pressure relief valve 2 and is then guided to the oil-gas separator. There, the oil and gas are separated; the oil is recovered, while the gas can be reintroduced into the intake system or released into the atmosphere. By reintroducing the gas from the crankcase into the intake system for combustion, pollutants directly emitted into the atmosphere are reduced, lowering the environmental impact. It also prevents oil leaks or cylinder head cover rupture due to excessive pressure in the crankcase, protecting the engine from damage.

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

[0060] This application provides a pressure relief port on the cylinder body 1 and restricts the pressure relief port through a pressure relief valve 2. This allows the cylinder to circulate normally when the internal air pressure of the cylinder body 1 is lower than the pressure relief valve 2's withstand value. However, when the internal air pressure of the cylinder body 1 is higher than the pressure relief valve 2's withstand value, the pressure relief valve 2 will open to discharge the gas inside the cylinder body 1, thereby reducing the internal pressure of the cylinder body 1.

[0061] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing 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 includes: Cylinder block, pressure relief valve, three-way connector, and pressure sensor; A pressure relief port is provided on the side of the cylinder block body, and the pressure relief port is connected to the first interface of the three-way connector; The second port of the three-way connector is connected to the pressure relief valve, and the third port of the three-way connector is connected to the pressure sensor; The pressure relief valve is a one-way pressure relief valve. A spring is installed 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 spring force limit, it is compressed and thus opens the pressure relief valve. 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 in the crankcase by a sleeve seal, and the spring force is less than the pressure required for the oil dipstick sleeve to pop out; The pressure relief valve is connected to the air inlet pipe via a hose; The lower cavity of the cylinder block 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 outlet, which is connected to an oil-gas separator. The pressure relief port is located on the crankcase side wall at the lower part of the cylinder block body.

2. The pressure relief device according to claim 1, characterized in that, The pressure sensor is connected to the engine controller so that it can feed back the pressure status inside the cylinder block 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 block has reached a preset value, it triggers an abnormal cylinder block pressure warning.

4. The pressure relief device according to any one of claims 1 to 3, characterized in that, The pressure relief valve is threadedly connected to the pressure relief port, the pressure sensor is threadedly connected to the tee connector, and the tee connector is threadedly connected to the pressure relief valve.

5. The pressure relief device according to any one of claims 1 to 3, characterized in that, The pressure relief valve is connected to the intake pipe of the cylinder block body.

Images