Egr valve device and engine assembly
By inserting a heating element into the EGR valve assembly and combining it with the design of the mounting part and the sleeve part, the problem of EGR valve freezing in low-temperature environments is solved, achieving efficient heating and insulation effects and ensuring the normal operation of the EGR valve.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies cannot effectively prevent EGR valves from freezing in low-temperature environments, leading to jamming failures, and existing heating and insulation measures have limited effectiveness.
An EGR valve device is designed that heats the intake pipe by inserting a heating element into the intake pipe. The structural design of the mounting part and the sleeve part ensures concentrated heat transfer, and a temperature sensor is used for precise control.
Effectively prevents EGR valve from freezing, ensures normal system operation, improves heating and insulation efficiency, reduces heat loss, and ensures the reliability of EGR valve in low-temperature environments.
Smart Images
Figure CN224478994U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engine technology, specifically relating to an EGR valve device and an engine assembly. Background Technology
[0002] Exhaust Gas Recirculation (EGR) refers to the process of returning a portion of the exhaust gas from the engine to the intake manifold, where it is mixed with fresh air and re-enters the cylinders, thereby reducing the amount of pollutants emitted in the exhaust. Natural gas combustion products contain a large amount of water vapor. In low-temperature environments after the engine is stopped, this water vapor in the exhaust gas in the EGR intake manifold can condense on the EGR valve, leading to a sticking problem.
[0003] To prevent the EGR valve from freezing, existing solutions incorporate a water chamber at the mixer and EGR intake pipe flange before the EGR valve, using coolant for heating and insulation to prevent water vapor in the EGR intake pipe from condensing at the EGR valve, thus reducing the risk of freezing. However, because the water chamber can only store a limited amount of coolant, and the coolant stops circulating after the engine stops running, the existing solution has limited heating and insulation effects on the overall structure.
[0004] Therefore, there is an urgent need to provide an EGR valve device to solve the problem of EGR valve freezing after the engine is turned off in low-temperature regions. Utility Model Content
[0005] The purpose of this invention is to at least solve the problem of how to prevent EGR valves from freezing. This purpose is achieved through the following technical solution:
[0006] The first aspect of this utility model provides an EGR valve device, including an EGR valve, characterized in that it comprises:
[0007] An intake pipe, which is connected to the EGR valve;
[0008] The mounting part is connected to the air intake pipe and forms a cavity with the outer wall of the air intake pipe. The mounting part has a plug-in interface that communicates with the cavity.
[0009] A heating device, comprising a heating element, wherein the heating element is inserted into the cavity via the insertion interface.
[0010] The EGR valve device provided in this technical solution effectively raises the internal temperature of the intake pipe by heating it with a heating element under cold environmental conditions. This helps prevent icing of the EGR valve, ensuring the normal operation and reliability of the system. In terms of structural design, the mounting section not only connects and fixes the heating device, but also allows the heating device to be inserted into the cavity of the mounting section, ensuring connection stability. This design results in a compact overall structure with a relatively small footprint, facilitating installation and maintenance in limited spaces. Furthermore, the mounting section effectively concentrates the heat generated by the heating element within the cavity, significantly reducing heat loss. In this way, the heat generated by the heating element can be more concentratedly transferred to the intake pipe, thereby greatly improving the efficiency and effect of heating and insulation, ensuring the normal operation of the EGR valve in low-temperature environments.
[0011] In addition, the EGR valve device of this utility model may also have the following additional technical features:
[0012] In some embodiments of this utility model, the heating device further includes a sleeve portion having a connecting cavity, one end of the heating element facing away from the cavity being inserted into the connecting cavity, and one end of the sleeve portion connected to the heating element being inserted into the insertion interface and connected to the mounting portion.
[0013] In some embodiments of this utility model, the heating device further includes a positive wire and a negative wire, both of which are connected to the end of the sleeve portion away from the heating element. The heating element is electrically connected to a power source through the positive wire and the negative wire.
[0014] In some embodiments of this utility model, the heating element includes a first heating element, a second heating element, an insulating layer, and a conductive pin. The insulating layer is sandwiched between the first heating element and the second heating element to insulate and isolate them. The first heating element, the second heating element, and the end of the insulating layer away from the conductive pin are all inserted into the connecting cavity. The conductive pin passes through the end of the insulating layer away from the sleeve portion, and one end of the conductive pin is electrically connected to the first heating element, and the other end of the conductive pin is electrically connected to the second heating element. The first heating element is electrically connected to the positive electrode wire, and the second heating element is electrically connected to the negative electrode wire. The first heating element and the second heating element are connected in series.
[0015] In some embodiments of this utility model, the socket is provided with an external thread, the insertion interface is provided with an internal thread, and the socket is threadedly connected to the insertion interface.
[0016] In some embodiments of this utility model, the mounting part is provided with a drain outlet, and the drain outlet is connected to the cavity.
[0017] In some embodiments of this utility model, a temperature sensor is provided on the heating element, and the temperature sensor is used to detect the temperature of the heating element.
[0018] In some embodiments of this utility model, the heating element is a metal part or a ceramic part.
[0019] In some embodiments of this utility model, the heating element is at least partially in contact with the outer wall of the air inlet pipe.
[0020] A second aspect of this invention provides an engine assembly including the aforementioned EGR valve device. Attached Figure Description
[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0022] Figure 1 A schematic diagram of the structure of an engine assembly according to an embodiment of the present invention is shown.
[0023] Figure 2 A schematic diagram of the structure of a heating device according to an embodiment of the present invention is shown.
[0024] Figure 3 A partial structural schematic diagram of a heating device according to an embodiment of the present invention is shown.
[0025] The labels in the attached diagram are as follows:
[0026] 100. Mixer; 110. EGR valve mounting section;
[0027] 200. Air inlet pipe; 210. Mounting section; 211. Drain outlet;
[0028] 300. Heating device; 310. Heating element; 311. First heating element; 312. Second heating element; 313. Insulating layer; 314. Conductive pin; 320. Sleeve part; 330. Positive electrode wire; 340. Negative electrode wire. Detailed Implementation
[0029] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0030] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0031] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0032] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.
[0033] Figure 1A schematic diagram of the structure of an engine assembly according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of the heating device 300 according to an embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, this utility model proposes an EGR valve device, including an EGR valve, an intake pipe 200, a mounting part 210, and a heating device 300. The intake pipe 200 and the EGR valve are connected. The mounting part 210 is connected to the intake pipe 200 and forms a cavity with the outer wall of the intake pipe 200. The mounting part 210 has a plug-in interface, which is connected to the cavity. The heating device 300 includes a heating element 310, which is inserted into the cavity through the plug-in interface.
[0034] The EGR valve device provided by this technical solution heats the intake pipe 200 through the heating element 310 under cold environmental conditions, effectively raising the internal temperature level of the intake pipe 200. This measure helps prevent icing of the EGR valve, ensuring the normal operation and reliability of the system. In terms of structural design, the mounting part 210 not only connects and fixes the heating device 300, but also allows the heating device 300 to be inserted into the cavity of the mounting part 210, ensuring connection stability. This design makes the overall structure compact, occupying relatively little space, facilitating installation and maintenance in limited spaces. Furthermore, the mounting part 210 effectively concentrates the heat generated by the heating element 310 within the cavity, significantly reducing heat loss. In this way, the heat generated by the heating element 310 can be more concentratedly transferred to the intake pipe 200, thereby greatly improving the efficiency and effect of heating and insulation, ensuring the normal operation of the EGR valve in low-temperature environments.
[0035] For example, the intake pipe 200 and the intake end of the mixer 100 are connected, and the intake end of the mixer 100 is provided with an EGR valve mounting part 110, which is installed at the intake end of the mixer 100.
[0036] Furthermore, the heating element 310 can be made of a material with good heat dissipation capabilities. This is because, in cold regions, the temperature of the entire vehicle and engine body is higher than the ambient temperature. The heating element 310 can conduct cold to quickly cool down the vehicle, with a cooling rate much higher than that of the EGR valve and intake manifold 200. This allows water vapor in the exhaust gas in the intake manifold 200 to condense rapidly on the heating element 310, thereby eliminating the risk of EGR valve jamming.
[0037] Optionally, the mounting part 210 and the air intake pipe 200 can be integrally formed. Of course, the mounting part 210 can also be fixed to the outer wall of the air intake pipe 200 by welding.
[0038] Further, see also Figure 1 and Figure 2 The heating device 300 also includes a sleeve portion 320, which has a connecting cavity. One end of the heating element 310 facing away from the cavity is inserted into the connecting cavity. The end of the sleeve portion 320 connected to the heating element 310 is inserted into the insertion interface and connected to the mounting portion 210.
[0039] Understandably, the socket 320 serves to fix the heating element 310 and the mounting part 210. Optionally, the socket 320 is cylindrical, and correspondingly, the insertion interface is circular and is configured to match the dimensions of the socket 320, allowing the socket 320 to be stably fixed to the mounting part 210. To increase the stability of the connection, an adhesive can be used to reinforce the socket 320 and the mounting part 210.
[0040] Furthermore, in some embodiments, the socket 320 is provided with external threads, the insertion interface is provided with internal threads, and the socket 320 is threadedly connected to the insertion interface.
[0041] By using a threaded connection, the sleeve part 320 and the mounting part 210 can be tightly joined together. This connection method not only has a simple structural design but is also very convenient during assembly. Furthermore, this connection method provides excellent sealing performance, thereby effectively extending the service life of the entire structure and ensuring long-term stable operation of the equipment.
[0042] Furthermore, the heating device 300 also includes a positive electrode wire 330 and a negative electrode wire 340, both of which are connected to the end of the sleeve portion 320 away from the heating element 310. The heating element 310 is electrically connected to the power supply through the positive electrode wire 330 and the negative electrode wire 340.
[0043] It is understandable that the positive electrode wire 330 and the negative electrode wire 340, as well as the connection between the heating element 310 and the power supply, constitute a complete power-carrying circuit. In this circuit, when the heating element 310 is connected to the power supply and begins to be energized, the temperature of the heating element 310 will rise accordingly. To achieve a better heating effect, the heating element 310 is preferably made of a material with good electrical conductivity and high thermal conductivity.
[0044] In addition, the heating element 310 also has a condensation function in some situations. For example, when the vehicle is parked in winter, the temperature of the whole vehicle and engine is higher than the ambient temperature. Cold conduction can be carried out through the wires, and the heating element 310 can cool down quickly. The cooling rate is higher than that of the EGR valve and intake manifold 200. This allows the water vapor in the exhaust gas in the intake manifold 200 to condense quickly on the heating element 310, thereby eliminating the risk of EGR valve jamming.
[0045] Figure 3A partial structural schematic diagram of a heating device according to an embodiment of the present invention is shown. See also Figure 3 The heating element 310 includes a first heating element 311, a second heating element 312, an insulating layer 313, and a conductive pin 314. The insulating layer 313 is sandwiched between the first heating element 311 and the second heating element 312 to insulate and isolate the first heating element 311 and the second heating element 312. The ends of the first heating element 311, the second heating element 312, and the insulating layer 313 away from the conductive pin 314 are all inserted into the connecting cavity. The conductive pin 314 passes through the end of the insulating layer 313 away from the sleeve portion 320, and one end of the conductive pin 314 is electrically connected to the first heating element 311, while the other end of the conductive pin 314 is electrically connected to the second heating element 312. The first heating element 311 is electrically connected to the positive electrode wire 330, and the second heating element 312 is electrically connected to the negative electrode wire 340. The first heating element 311 and the second heating element 312 are connected in series.
[0046] By employing this specific structural design, the positive electrode wire 330, the first heating element 311, the conductive pin 314, the second heating element 312, and the negative electrode wire 340 are connected to the power supply, forming a complete power-carrying circuit. This design allows current to be efficiently transferred to the first heating element 311 and the second heating element 312, thereby significantly improving heating efficiency. The first heating element 311, the insulating layer 313, and the second heating element 312 are stacked and arranged in a cylindrical structure, with its end inserted into the connecting cavity of the socket 320. Therefore, the connecting cavity is a cylindrical cavity to facilitate insertion and mating with the heating element 310. In some optional design schemes, the conductive pin 314 is designed as a circular conductor that passes through the first heating element 311, the insulating layer 313, and the second heating element 312, thereby achieving a conductive connection between the first heating element 311 and the second heating element 312. In addition, the first heating element 311 and the second heating element 312 are respectively provided with positioning holes for inserting the conductive pin 314, which further ensures the accuracy and reliability of the connection.
[0047] Furthermore, the installation part 210 is provided with a drain outlet 211, which is connected to the cavity.
[0048] The drain port 211 is used to drain water from inside the cavity. Specifically, when the heating element 310 is severely frozen, the heating element 310 heats up to melt the ice, and the melted water can flow out from the drain port 211 in a timely manner. In this way, water can be prevented from remaining in the cavity, and water vapor can be prevented from re-condensing on the heating element 310 after heating stops. Optionally, the mounting part 210 is located at the bottom of the air inlet pipe 200, and the drain port 211 opens downwards, so that the water in the cavity can flow out smoothly from the drain port 211 by its own gravity. Optionally, the bottom of the mounting part 210 can be inclined, and the drain port 211 is located at the lowest point of the mounting part 210, so that water can naturally slide into the drain port 211 and avoid residue.
[0049] Furthermore, a temperature sensor is provided on the heating element 310, which is used to detect the temperature of the heating element 310.
[0050] By installing a temperature sensor on the heating element 310, the temperature changes of the heating element 310 can be monitored and recorded in real time. This process is crucial for accurately controlling the operating state of the heating element 310. The temperature sensor and the control unit are connected via a signal line, ensuring instantaneous transmission of temperature data. When the temperature sensor detects temperature data from the heating element 310, it immediately sends this data to the control unit. Upon receiving the temperature signal, the control unit determines whether to start or stop the heating element 310 based on this data. To ensure that the heating element 310 operates within a suitable temperature range, specific temperature thresholds are set. Specifically, when the temperature sensor detects that the temperature of the heating element 310 has dropped to 0°C or below, the control unit issues a command to start the heating element 310 to prevent its temperature from dropping further. Conversely, when the temperature sensor detects that the temperature of the heating element 310 has reached or exceeded 10°C, the control unit commands the heating element 310 to stop being powered on, thereby avoiding overheating. This precise temperature control mechanism ensures that the heating element 310 operates efficiently and safely, while also extending its service life.
[0051] Optionally, the heating element 310 can be a metal or ceramic component.
[0052] The heating element 310 is preferably made of a material with good electrical conductivity and high thermal conductivity. For example, the heating element 310 may be made of nickel-chromium alloy or silicon carbide.
[0053] Furthermore, the heating element 310 is at least partially in contact with the outer wall of the intake pipe 200.
[0054] It is understood that by bringing the heating element 310 into contact with the outer wall of the intake pipe 200, efficient heat transfer between the heating element 310 and the intake pipe 200 can be ensured. In this embodiment, to ensure that the heating element 310 can make tight contact with the intake pipe 200, the axial direction of the insertion interface is tilted, so that the heating element 310 can be inserted into the cavity at an angle and make contact with the intake pipe 200. In other possible embodiments, the contact area between the heating element 310 and the outer wall of the intake pipe 200 can be increased by changing the geometry of the heating element 310, thereby further improving the efficiency of heat exchange.
[0055] Furthermore, this technical solution also provides an engine assembly including the aforementioned EGR valve device.
[0056] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. An EGR valve device, comprising an EGR valve, characterized in that, include: An intake pipe (200) is connected to the EGR valve; Mounting part (210) is connected to the air intake pipe (200) and forms a cavity with the outer wall of the air intake pipe (200). The mounting part (210) has a plug-in interface that communicates with the cavity. A heating device (300) includes a heating element (310) which is inserted into the cavity through the insertion interface.
2. The EGR valve device according to claim 1, characterized in that, The heating device (300) further includes a sleeve (320) having a connecting cavity. One end of the heating element (310) facing away from the cavity is inserted into the connecting cavity. One end of the sleeve (320) connected to the heating element (310) is inserted into the insertion interface and connected to the mounting part (210).
3. The EGR valve device according to claim 2, characterized in that, The heating device (300) further includes a positive electrode wire (330) and a negative electrode wire (340), both of which are connected to the end of the sleeve (320) away from the heating element (310). The heating element (310) is electrically connected to the power supply through the positive electrode wire (330) and the negative electrode wire (340).
4. The EGR valve device according to claim 3, characterized in that, The heating element (310) includes a first heating element (311), a second heating element (312), an insulating layer (313), and a conductive pin (314). The insulating layer (313) is sandwiched between the first heating element (311) and the second heating element (312) to insulate and isolate them. The ends of the first heating element (311), the second heating element (312), and the insulating layer (313) away from the conductive pin (314) are all inserted into the connecting cavity. The conductive pin (314) passes through the end of the insulating layer (313) away from the sleeve (320), and one end of the conductive pin (314) is electrically connected to the first heating element (311), and the other end of the conductive pin (314) is electrically connected to the second heating element (312). The first heating element (311) is electrically connected to the positive electrode wire (330), and the second heating element (312) is electrically connected to the negative electrode wire (340). The first heating element (311) and the second heating element (312) are connected in series.
5. The EGR valve device according to any one of claims 2-4, characterized in that, The socket (320) is provided with an external thread, the insertion interface is provided with an internal thread, and the socket (320) is threadedly connected to the insertion interface.
6. The EGR valve device according to any one of claims 1-4, characterized in that, The mounting part (210) is provided with a drain outlet (211), and the drain outlet (211) is connected to the cavity.
7. The EGR valve device according to any one of claims 1-4, characterized in that, A temperature sensor is provided on the heating element (310) for detecting the temperature of the heating element (310).
8. The EGR valve device according to any one of claims 1-4, characterized in that, The heating element (310) is a metal or ceramic component.
9. The EGR valve device according to any one of claims 1-4, characterized in that, The heating element (310) is at least partially in contact with the outer wall of the air intake pipe (200).
10. An engine assembly, characterized in that, Includes the EGR valve device according to any one of claims 1-9.