KR-102962207-B1 - BYPASS VALVE

Abstract

The present invention comprises a valve housing, a valve guide body fixed to the valve housing, and a valve disc inserted into a coupling hole of the valve guide body inside the valve housing and guiding the valve to a closed state and an open state, wherein the valve disc has a beam (I) shaped guide rod, and the guide rod is inserted into the coupling hole and moves up and down in the valve guide body.

Inventors

• 김의태
• 이승연
• 추동호
• 남혜동
• 이경민
• 송종은

Assignees

• 현대자동차주식회사
• 기아 주식회사
• 주식회사 인팩

Dates

Publication Date

20260507

Application Date

20210405

Claims (4)

1. Valve housing; A valve guide body fixed to the above valve housing; and It includes a valve disc that is inserted into the coupling hole of the valve guide body inside the valve housing and guides the valve to a closed state and an open state. The above valve disc is, A guide rod in the shape of a beam (I) is provided, and the guide rod is inserted into the coupling hole and moves up and down in the valve guide body. The above valve disc is, A bypass valve characterized by having a plurality of through holes arranged radially with respect to the center so as to allow air to be vented as it moves up and down in the valve guide body.
2. delete
3. In Article 1, The above coupling hole is, A pair of guide protrusions facing each other are provided internally to correspond to a pair of concave portions formed in the guide rod, and A bypass valve characterized in that the above valve disc is rail-coupled and moves up and down while the above-described concave portion is fitted and coupled to the above-described guide projection.
4. In Article 1, The above valve disc is, A bypass valve characterized by being made of any one of plastic, aluminum, or steel.

Description

Bypass Valve The present invention relates to a bypass valve, and more specifically, to a bypass valve that simplifies the guide rod structure of the valve disc so that the guide rod shape can be manufactured using not only plastic but also steel, aluminum, etc. Generally, turbocharging systems such as those used in internal combustion engines are widely known. A turbocharger includes an exhaust gas turbine coupled to a compressor of the intake charge, and the turbine receives a stream of exhaust gas from an internal combustion engine and operates by converting a portion of the energy of the exhaust gas stream into mechanical energy by passing the exhaust stream through the blades of a turbine wheel, thereby rotating the turbine wheel. This rotational movement is used by a compressor coupled to a turbine wheel by a shaft to compress a volume of air to a higher pressure than the air entering from the inlet, and then provides an increased volume of air into the internal combustion engine cylinder that can be introduced during the engine's intake stroke, and the additional compressed air introduced into the cylinder can cause more fuel to burn within the cylinder, thereby increasing the engine's output. The turbine within a turbocharger is sometimes referred to as a gas extender because, essentially, the turbine converts a portion of the energy—expressed as the pressure difference between the gas in the exhaust stream and the ambient pressure—into mechanical energy in the form of rotation for the turbine and compressor. In turbocharged internal combustion engine systems, the wide range of speeds and power levels at which the internal combustion engine can operate presents a challenge in designing a properly matched turbocharged system that possesses excellent mechanical efficiency in conjunction with the engine. For example, a smaller turbocharger provides faster and more efficient boost at slower engine speeds, while a larger turbocharger provides more efficient boost at higher engine speeds. Due to the relatively narrow flow range in which a turbocharger operates efficiently compared to the wide flow range generated by an internal combustion engine, it has been known in conventional technology (i.e., where high boost is required) to provide a multi-stage turbocharging system comprising both a smaller (i.e., "high pressure") turbocharger and a larger (i.e., "low pressure") turbocharger, wherein the smaller high-pressure turbocharger operates at low engine speeds and the larger low-pressure turbocharger operates at high engine speeds. Accordingly, it was found that it is worthwhile to use a bypass system to switch between two turbocharging stages to divert the exhaust gas flow around the high-pressure turbocharger to the low-pressure turbocharger as required, and bypassing the exhaust gas flow around the turbine is also known as prior art. Typically, a turbine bypass system is primarily used to regulate the system pressure of the entire high-pressure turbine, and when the back pressure generated by turbine operation exceeds a predetermined level upstream of the system pressure of the high-pressure turbine, it can be operated by selectively extracting a portion of the upstream exhaust gas through the bypass channel to a pressure drop greater than the level of the back pressure. In addition, the extraction of exhaust gas into the bypass channel is generally controlled by a small control valve, namely a bypass valve, called a "wastegate," located within the bypass channel around the turbine. These wastegate valves operate somewhat similarly to trap doors, opening a port upstream of the high-pressure turbine inlet—that is, a port of the bypass channel—to divert a portion of the exhaust gas flow around the turbine, along with the bypassed exhaust gas flow that originally expands across the passage through the bypass channel and the pressure drop at the wastegate, and then recombining it with the residue downstream of the bypassed turbine exhaust gas flow. FIG. 1 is a diagram schematically illustrating an internal combustion engine system having a conventional multi-stage turbocharging system according to known technology. FIG. 2 is a diagram schematically showing a bypass valve according to an embodiment of the present invention. FIG. 3 is a drawing for showing the internal structure of a bypass valve according to an embodiment of the present invention. FIG. 4 is a drawing for showing a valve disc structure for a bypass valve according to an embodiment of the present invention. FIG. 5 is a drawing for showing a through hole for a bypass valve according to an embodiment of the present invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention and the method for achieving them will become clear by referring to the embodiments described in detail below together with the accomp