An engine intake manifold

Abstract

This utility model provides an intake manifold for an engine, belonging to the field of engine structure technology. This intake manifold integrates a preheating pipe, one end of which is connected to a coolant outlet on the engine cylinder head, and the other end is equipped with an engine thermostat. This design preheats the air entering each cylinder using coolant flowing out of the engine. This solves the problems of insufficient engine power output and increased fuel consumption caused by the reduced air temperature inside the intake manifold in low-temperature winter environments, and the problem that adding heating wires before the intake manifold to preheat the intake air would increase production costs and potential sources of failure. This engine's intake manifold is used to distribute air to each cylinder, including a preheating pipe integrated into the intake manifold to preheat the air entering each cylinder; one end of the preheating pipe is connected to a coolant outlet on the cylinder head, and the other end is equipped with an engine thermostat.

Description

Technical Field

[0001] This utility model belongs to the field of engine structure technology, and in particular relates to an engine intake manifold. Background Technology

[0002] The intake manifold is responsible for supplying air (or a mixture of air and fuel) to the cylinders, directly affecting intake efficiency, combustion uniformity, and power output.

[0003] In low-temperature winter conditions, the air temperature inside the intake manifold also decreases. When cold air mixes with fuel, the ignition delay time increases, the combustion speed slows down, and combustion becomes incomplete, resulting in insufficient engine power output and increased fuel consumption. Incomplete combustion also produces more hydrocarbons (HC) and carbon monoxide, leading to excessive exhaust emissions. At the same time, the temperature difference between the inside and outside of the intake manifold is large in winter, and the temperature of its inner wall may be lower than the dew point temperature, causing water vapor in the air to condense into water droplets on the pipe wall. These water droplets not only corrode the pipe wall but also increase intake resistance and reduce intake efficiency.

[0004] To address the aforementioned technical issues, existing technologies involve adding heating wires before the intake manifold to preheat the intake air. However, considering the usage scenarios and target audience of microvans / light commercial vehicles, cost control is stringent for this type of vehicle. Adding heating wires not only increases production costs but also introduces new sources of engine failure. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an engine intake manifold to solve the problems of insufficient engine power output and increased fuel consumption caused by the reduced air temperature in the intake manifold of microvans / light commercial vehicles in low-temperature winter environments. The existing technology also addresses the problem that adding heating wires in front of the intake manifold to preheat the intake air would increase production costs and sources of failure.

[0006] To achieve the above and other related objectives, this utility model provides an intake manifold for an engine, used to distribute air to each cylinder, including a preheating pipe integrated on the intake manifold to preheat the air entering each cylinder; one end of the preheating pipe is connected to a water outlet on the cylinder head, and the other end is provided with an engine thermostat.

[0007] Optionally, it also includes: an intake manifold, through which air enters; and an intake manifold body connected to the intake manifold, including multiple intake manifolds, each of which corresponds to a cylinder.

[0008] Optionally, the preheating pipe is located at the lower part of the intake manifold.

[0009] Optionally, the preheating pipe is located at the connection between the intake pipe and the cylinder.

[0010] Optionally, the preheating pipe and the intake manifold are integrated together via multiple connecting plates;

[0011] The multiple connecting plates form a preheating channel.

[0012] Optionally, the connecting plate includes a "П"-shaped plate and a flat plate. The "П"-shaped plate and multiple intake single pipes are integrally formed, and the flat plate and the preheating pipe are integrally formed. The "П"-shaped plate and the flat plate are connected by bolts and form the preheating channel.

[0013] Optionally, the intake manifold is made of PA66+GF30 plastic.

[0014] As described above, the intake manifold of an engine according to the present invention has at least the following beneficial effects:

[0015] This engine's intake manifold integrates a preheating pipe. One end of this preheating pipe connects to the coolant outlet on the engine cylinder head, while the other end houses the engine's thermostat. This design preheats the air entering each cylinder using the coolant flowing out of the engine. Compared to existing designs that add heating wires before the intake manifold, this design not only preheats the air in the intake manifold but also consumes no extra energy and requires no additional components (the preheating pipe is essentially an extension of the engine's coolant outlet pipe, not considered an additional component). Production costs are controlled, and no new sources of failure are introduced (the preheating pipe, as an extension of the coolant outlet pipe, operates stably, while the heating wire is prone to damage due to overcurrent). This solves the problem of insufficient engine power output and increased fuel consumption caused by the reduced air temperature in the intake manifold of microvans / light commercial vehicles in low-temperature winter conditions, which is a consequence of existing technologies that add heating wires before the intake manifold to preheat the intake air, thus increasing production costs and potential sources of failure. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic diagram of an engine intake manifold according to this utility model.

[0017] Figure 2 The diagram shown is a schematic of the connecting plate and preheating channel of this utility model.

[0018] Component designation explanation

[0019] 1. Preheating pipe, 2. Thermostat, 3. Water outlet, 4. Main intake pipe, 5. Intake manifold body, 6. Single intake pipe, 7. Connecting plate, 71. "П" shaped plate, 72. Flat plate, 8. Preheating channel, 9. Water outlet pipe. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] Please see Figures 1 to 2 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0023] Please see Figure 1 This utility model provides an intake manifold for an engine, which, like the prior art, is used to distribute air to each cylinder. The difference lies in that this intake manifold includes:

[0024] like Figure 1The preheating pipe 1 shown is integrated into the intake manifold and preheats the air entering each cylinder. One end of the preheating pipe 1 is connected to the water outlet 3 on the cylinder head, and the other end is equipped with the engine thermostat 2. Specifically, the intake manifold of this engine uses the coolant flowing out of the engine (usually water, because the coolant carries away heat from inside the engine, so the temperature of the coolant flowing out of the engine is higher than the ambient temperature) to preheat the air entering each cylinder. Compared with the existing technology that adds a heating wire before the intake manifold, this design not only preheats the air in the intake manifold but also... It consumes no extra energy and does not add any extra parts (the preheating pipe 1 is essentially an extension of the engine's water outlet pipe 9, so it is not considered an extra part). Production costs are controlled, and no new sources of failure are added (the preheating pipe 1, as an extension of the water outlet pipe 9, works stably, while the heating wire is prone to damage due to overcurrent). This solves the problem that existing technologies, in low-temperature winter environments for microvans / light commercial vehicles, cause insufficient engine power output and increased fuel consumption due to the reduced air temperature in the intake manifold. Adding a heating wire in front of the intake manifold to preheat the intake air would increase production costs and sources of failure.

[0025] At the same time, the intake manifold also cools the coolant flowing out of the engine. It can be said that the preheating pipe 1 is integrated into the intake manifold. One end of the preheating pipe 1 is connected to the water outlet 3 on the engine cylinder head, and the other end is equipped with the engine thermostat 2. Thus, the design of preheating the air entering each cylinder by the coolant flowing out of the engine is a two-in-one design.

[0026] We will also provide a brief introduction to thermostat 2 to help readers further understand the technical solutions described in this manual. Thermostat 2 regulates the engine's operating temperature by controlling the flow of coolant, ensuring that the engine operates within its optimal temperature range (85℃~95℃). Specifically, when the engine is cold-started, thermostat 2 is closed, allowing the coolant to circulate only in a small loop within the engine. This allows the engine to warm up quickly to its optimal operating temperature, reducing wear and lowering harmful substances in exhaust emissions. Once the engine temperature reaches a certain level (85℃), thermostat 2 opens, and the coolant begins a large circulation loop, dissipating heat through the radiator to maintain the engine temperature within its normal operating range. Both work together to ensure the engine receives sufficient air intake at the appropriate temperature, thereby achieving efficient combustion and power output.

[0027] In another embodiment, the intake manifold of this engine further includes:

[0028] like Figure 1 The intake manifold 4 shown is through which air enters.

[0029] like Figure 1 The intake manifold body 5 shown includes multiple intake manifolds 6 connected to the main intake manifold 4. Each intake manifold 6 corresponds to one cylinder. Generally speaking, microvans / light commercial vehicles use transverse four-cylinder gasoline engines, so there are four intake manifolds 6, each corresponding to one of the four cylinders.

[0030] In another implementation, please refer to Figure 1 The preheating pipe 1 is located at the lower part of the intake manifold to prevent the rapid loss of coolant temperature in the preheating pipe 1 and to ensure the preheating effect on the air in the intake manifold.

[0031] In another implementation, please refer to Figure 1 The preheating pipe 1 is located at the connection between the intake pipe 6 and the cylinder. Compared with setting the preheating pipe 1 elsewhere, the preheated air can enter the cylinder in time without the temperature dropping due to flowing through the unpreheated intake pipe 6.

[0032] In another implementation, please refer to Figure 1 and Figure 2 The preheating pipe 1 and the intake manifold are integrated together by multiple connecting plates 7; the multiple connecting plates 7 form a preheating channel 8, which further ensures the preheating effect and avoids heat loss.

[0033] In another implementation, please refer to Figure 2 The connecting plate 7 includes a “П”-shaped plate 71 and a flat plate 72. The “П”-shaped plate 71 and multiple intake single pipes 6 are integrally formed, and the flat plate 72 and the preheating pipe 1 are integrally formed. The “П”-shaped plate 71 and the flat plate 72 are connected by bolts and form the preheating channel 8. The structure of this embodiment is simple, the connection is firm, and the assembly is simple.

[0034] In other implementations, such as Figure 1 As shown, both the intake manifold and the preheating pipe 1 are made of PA66+GF30 plastic, a high-performance engineering plastic composed of nylon 66 (PA66) and 30% glass fiber (GF30). It has the advantages of high strength and high rigidity, making it suitable for load-bearing components; high temperature resistance, making it suitable for high-temperature environments such as engine compartments; good chemical resistance and strong corrosion resistance; dimensional stability and high processing precision; and low cost and high cost-effectiveness.

[0035] In summary, this utility model integrates a preheating pipe 1, one end of which is connected to the water outlet 3 on the engine cylinder head, and the other end is equipped with the engine thermostat 2. This design preheats the air entering each cylinder by allowing the coolant flowing out of the engine to flow into it. Compared with the existing technology that adds a heating wire before the intake manifold, this design not only preheats the air in the intake manifold but also does not consume additional energy or add any additional parts (the preheating pipe 1 is essentially an extension of the engine's water outlet pipe 9, which is not considered an additional part). Production costs are controlled, and no new sources of failure are added (the preheating pipe 1, as an extension of the water outlet pipe 9, works stably, while the heating wire is prone to damage due to overcurrent). This solves the problem of insufficient engine power output and increased fuel consumption caused by the reduced air temperature in the intake manifold of microvans / light commercial vehicles in low-temperature winter environments, and the problem that adding a heating wire before the intake manifold to preheat the intake air would increase production costs and sources of failure. Therefore, this utility model effectively overcomes the shortcomings of the prior art and has high industrial application value.

[0036] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An intake manifold for an engine, used to distribute air to individual cylinders, characterized in that, include: A preheating pipe, integrated on the intake manifold, preheats the air entering each of the cylinders; One end of the preheating pipe is connected to the water outlet on the cylinder head of the engine, and the other end is equipped with the engine's thermostat.

2. The intake manifold of an engine according to claim 1, characterized in that, Also includes: Air intake manifold, through which air enters; The intake manifold body is connected to the main intake pipe and includes multiple intake manifolds, each of which corresponds to a cylinder.

3. The intake manifold of an engine according to claim 1, characterized in that: The preheating pipe is located at the lower part of the intake manifold.

4. The intake manifold of an engine according to claim 2, characterized in that: The preheating pipe is located at the connection between the intake pipe and the cylinder.

5. The intake manifold of an engine according to claim 2, characterized in that: The preheating pipe and the intake manifold are integrated together via multiple connecting plates; The multiple connecting plates form a preheating channel.

6. The intake manifold of an engine according to claim 5, characterized in that: The connecting plate includes a "П"-shaped plate and a flat plate. The "П"-shaped plate and multiple intake single pipes are integrally formed, and the flat plate and the preheating pipe are integrally formed. The "П"-shaped plate and the flat plate are connected by bolts and form the preheating channel.

7. The intake manifold of an engine according to claim 1, characterized in that: The intake manifold is made of PA66+GF30 plastic.

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