Variable area windward heating device for intake port of methanol engine

Abstract

This utility model relates to a device for adjusting the windward heating area of ​​a methanol engine intake duct. It includes: an intake heating housing; a heating grille rotatably mounted within a receiving cavity; a mounting rod extending above the intake heating unit and mounted on the top of the heating grille; and a transmission assembly comprising multiple motor commutator housings correspondingly mounted on the tops of the intake heating units, a horizontally arranged transmission worm gear passing through the multiple motor commutator housings, a DC drive motor mounted on the outermost motor commutator housing and connected to the end of the transmission worm gear, and a transmission turbine mounted on the mounting rod and meshing with the transmission worm gear, the transmission turbine being located within the motor commutator housing. Thus, when the DC drive motor operates, it drives the transmission worm gear to rotate, which in turn drives the transmission turbine, thereby rotating the heating grille and adjusting the windward heating area.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, specifically relating to a device for variable frontal heating area of ​​the intake manifold of a methanol engine. Background Technology

[0002] Considering China's energy structure of being rich in coal but lacking in oil, and the similar combustion characteristics of methanol (a coal-based liquid fuel) to gasoline and diesel, methanol is considered one of the most promising alternative fuels. By the end of 2022, China's total methanol production capacity had reached 113 million tons. Compared to gasoline and diesel, methanol is much cheaper; therefore, using methanol as an energy source is entirely feasible.

[0003] Methanol has a high latent heat of vaporization, which helps to lower the maximum combustion temperature, thus reducing nitrogen oxide (NOx) emissions in engines. x The emissions from methanol are significant. Because methanol has a high latent heat of vaporization, it can cause difficulties in cold starting the engine under low temperatures in winter. Therefore, a heating device is needed to heat the intake air and methanol to ensure stable combustion. In high-power methanol engines, the injection volume of methanol is large, and due to the increased power, a larger heating area is required to provide greater heating efficiency. However, a larger heating area leads to increased intake resistance and reduced intake efficiency. Therefore, a variable heating area intake heating device needs to be designed. During the cold start phase, a larger heating area is used. After successful starting and warm-up, the angle of the heating device is changed mechanically to reduce the frontal area and thus reduce intake resistance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for variable frontal heating area of ​​the intake manifold of a methanol engine.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a device for variable frontal heating area of ​​the intake duct of a methanol engine, comprising:

[0006] An air intake heating shell includes a plurality of air intake heating units that are arranged on the same straight line and connected in sequence. Each air intake heating unit includes a shell with a receiving cavity, an air inlet formed on the shell and communicating with the receiving cavity, and an air outlet formed on the shell and communicating with the receiving cavity.

[0007] A heating grille is rotatably mounted within the receiving cavity; a mounting rod extending above the intake heating unit is mounted on the top of the heating grille.

[0008] The transmission assembly includes multiple motor commutator housings mounted one-to-one on top of multiple intake heating units, a horizontally arranged transmission worm gear passing through multiple motor commutator housings, a DC drive motor mounted on the outermost motor commutator housing and connected to the end of the transmission worm gear, and a transmission turbine gear fitted on the mounting rod and meshing with the transmission worm gear, the transmission turbine gear being located inside the motor commutator housing.

[0009] Ideally, the air inlet and the air outlet are arranged opposite to each other.

[0010] Ideally, it also includes multiple heating power supply housings mounted one-to-one on top of the multiple motor commutation housings.

[0011] Furthermore, it also includes multiple disc-shaped slip rings fitted onto the mounting rod and located within the housing of the heating power supply.

[0012] Optimally, it also includes multiple temperature sensors, with adjacent housings connected by an adapter unit, and at least one of the temperature sensors mounted on one or more of the adapter units.

[0013] Furthermore, the intake heating units are an even number and grouped in pairs, and a temperature sensor is installed on the adapter unit between the two groups of intake heating units.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The variable frontal heating area device of the methanol engine intake duct of this utility model is achieved by using an intake heating shell, a heating grille and a transmission component with a specific structure. When the DC drive motor is working, it can drive the transmission worm gear to rotate, thereby driving the transmission turbine to rotate, and then driving the heating grille to rotate, so as to realize the adjustment of the frontal heating area. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the variable frontal heating area device for the methanol engine intake duct of this utility model;

[0016] Figure 2 for Figure 1 The front view;

[0017] Figure 3 for Figure 2 AA section view;

[0018] Figure 4 This is a control structure diagram of the variable frontal heating area device for the methanol engine intake duct of the present invention (Example 2).

[0019] Figure 5The control structure circuit diagram of the variable frontal heating area device for the methanol engine intake duct of this utility model is shown in Example 2. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. Example 1

[0021] like Figures 1 to 3 The variable-area intake heating device for the methanol engine shown mainly includes a matching intake heating shell 1, a heating grille 5, and a transmission assembly.

[0022] The intake heating housing 1 includes multiple intake heating units 11 arranged in a straight line and connected sequentially (the specific number can be conventionally selected according to the number of intake manifolds of the engine; in this embodiment, there are six). Each intake heating unit 11 includes a housing 111 with a receiving cavity, an intake port 112 formed on the housing 111 and communicating with the receiving cavity, and an exhaust port 113 formed on the housing 111 and communicating with the receiving cavity. The intake port 112 and the exhaust port 113 are arranged opposite to each other. The specific shape of the housing 111 is usually conventionally designed or adjusted according to the connection structure between the intake manifold and the engine intake.

[0023] The heating grille 5 is rotatably mounted in the receiving cavity. Specifically, a mounting rod 51 extending above the intake heating unit 11 is mounted on the top of the heating grille 5, that is, the mounting rod 51 extends upward and passes through the intake heating unit 11. In this embodiment, the number of heating grilles 5 is the same as the number of intake heating units 11, so that the heating grilles 5 are installed in the receiving cavity of the intake heating unit 11 in a one-to-one correspondence.

[0024] The transmission assembly includes multiple motor reversing housings 2 (i.e., the number of motor reversing housings 2 is the same as the number of air intake heating units 11) that are installed one-to-one on the top of multiple air intake heating units 11, preferably with a bearing installed on the upper and lower parts of each motor reversing housing 2, so that the mounting rod 51 of the heating grille 5 extends upward and passes through the aforementioned bearing, so that the bearing is fitted on the mounting rod 51 (such as an interference fit or other conventional method) to reduce the friction when the mounting rod 51 rotates, and a horizontally arranged transmission worm gear 6 (i.e., multiple The motor commutator housing 2 shares a single transmission worm gear 6; a DC drive motor 3 (i.e., a single DC drive motor 3, mounted on the outermost motor commutator housing 2 and connected to the end of the transmission worm gear 6; to improve the reliability of the DC drive motor 3, it is preferable to also mount the DC drive motor 3 on the outer wall of the outermost motor commutator housing 2); and a transmission turbine 7 (which can be an interference fit, pin connection, or other conventional type) fitted onto the mounting rod 51 and meshing with the transmission worm gear 6, located inside the motor commutator housing 2. Thus, when the DC drive motor 3 operates, it can drive the transmission worm gear 6 to rotate, thereby driving the transmission turbine 7 to rotate, and consequently, driving the rotation of the heating grille 5, achieving adjustment of the windward heating area.

[0025] In this embodiment, the variable intake duct frontal heating area device for the methanol engine also includes multiple heating power supply housings 9, each correspondingly mounted on top of multiple motor commutator housings 2. The variable intake duct frontal heating area device for the methanol engine also includes multiple disc-shaped slip rings 8 (the number of disc-shaped slip rings 8 and heating power supply housings 9 is the same as the number of intake heating units 11, and they are installed correspondingly within the heating power supply housings 9) mounted on the mounting rod 51 and located within the heating power supply housings 9. This is because the heating grille 5 needs to rotate, and to avoid damage from tangling or repeated bending of the heating power supply leads, disc-shaped slip rings 8 are used to lead out the heating power supply lines.

[0026] In this embodiment, the variable intake heating area device for the methanol engine also includes multiple temperature sensors 10. Two adjacent housings 111 are connected by a connecting unit 12, and at least one temperature sensor 10 is installed on one or more connecting units 12. To reduce the number of temperature sensors 10 used, the intake heating units 11 can be set to an even number and grouped in pairs. One temperature sensor 10 is installed on the connecting unit 12 between two groups of intake heating units 11, that is, one group of intake heating units 11 (two intake heating units 11) shares one temperature sensor 10, and in this case, there are three temperature sensors 10. Example 2

[0027] This embodiment provides a variable intake heating area device for a methanol engine, which is basically the same as that in Embodiment 1. The difference is that it also includes a hollow shaft angle sensor 4 that is rigidly connected to the mounting rod 51 (a conventional rigid connection, such as welding, bolting, riveting, etc.). In this case, the number of hollow shaft angle sensors 4 is the same as the number of intake heating units 11. They are arranged one-to-one on the upper surface of the motor reversing housing 2. The heating power supply housing 9 can be installed on the hollow shaft angle sensor 4 without affecting the rotation of the hollow shaft angle sensor 4. Thus, the rotation angle of the heating grille 5 is detected by the hollow shaft angle sensor 4 (that is, the rotation state of the heating grille 5 is fed back in real time through the hollow shaft angle sensor 4).

[0028] To improve the automation level of the variable intake manifold heating area device in methanol engines, a controller and heating relay were added. For example... Figure 4 As shown, the controller is connected to the hollow shaft angle sensor 4, temperature sensor 10, and DC drive motor 3, and is also connected to the heating grid 5 via a heating relay. It receives signals from the hollow shaft angle sensor 4 and temperature sensor 10 to control the DC drive motor 3 and the heating relay. Existing conventional connections can be used between them; refer to [reference needed]. Figure 5 The circuit diagram shown.

[0029] The working principle of the variable frontal heating area device for the methanol engine intake is as follows:

[0030] The controller receives real-time feedback on the engine's status to determine whether intake air heating is required.

[0031] When the engine needs intake air heating, the controller controls the heating relay to open, the heating grille 5 is energized and heats up, and the air in the intake manifold is instantly heated by the heating grille 5.

[0032] While heating the flowing air, a temperature sensor 10 monitors the temperature of the intake air in real time and feeds it back to the controller in real time.

[0033] When the intake air heating temperature is too high, the controller issues a control command to control the rotation of the DC drive motor 3 to reduce the frontal area of ​​the heating grille 5 in the intake duct. The hollow shaft angle sensor 4 monitors and provides feedback in real time, and combined with the monitoring and feedback of the temperature sensor 10, the temperature of the air flowing through the intake duct is precisely controlled.

[0034] When the intake air heating temperature is too low, the controller issues a control command to control the rotation of the DC drive motor 3 to adjust and increase the windward area of ​​the heating grille 5 in the intake duct. The hollow shaft angle sensor 4 monitors and provides feedback in real time, and combined with the monitoring and feedback of the temperature sensor 10, the temperature of the air flowing through the intake duct is precisely controlled.

[0035] When the engine is working normally and there is no need for intake air heating, the controller issues a control command to control the rotation of the DC drive motor 3 to adjust the heating grille 5 in the intake duct to be perpendicular to the intake duct opening (i.e., the frontal area of ​​the heating grille is minimized). At this time, the influence of the heating grille 5 on the intake resistance in the intake duct is almost negligible and does not affect the normal operation of the engine.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for variable frontal heating area of ​​the intake duct of a methanol engine, characterized in that it... include: An air intake heating shell (1) is provided, comprising a plurality of air intake heating units (11) that are on the same straight line and connected in sequence. Each air intake heating unit (11) includes a shell (111) having a receiving cavity, an air inlet (112) opened on the shell (111) and communicating with the receiving cavity, and an air outlet (113) opened on the shell (111) and communicating with the receiving cavity. A heating grille (5) is rotatably mounted in the receiving cavity; a mounting rod (51) extending above the air intake heating unit (11) is mounted on the top of the heating grille (5). The transmission assembly includes multiple motor commutator housings (2) that are installed one-to-one on the top of multiple intake heating units (11), a transmission worm (6) that is horizontally arranged and passes through multiple motor commutator housings (2), a DC drive motor (3) that is installed on the outermost motor commutator housing (2) and connected to the end of the transmission worm (6), and a transmission turbine (7) that is fitted on the mounting rod (51) and meshes with the transmission worm (6), the transmission turbine (7) being located inside the motor commutator housing (2).

2. The variable-area inlet heating device for a methanol engine according to claim 1, characterized in that: The air inlet (112) and the air outlet (113) are arranged opposite to each other.

3. The variable-area inlet heating device for a methanol engine according to claim 1, characterized in that: It also includes multiple heating power supply housings (9) that are installed one-to-one on top of the multiple motor commutation housings (2).

4. The variable-area inlet heating device for a methanol engine according to claim 3, characterized in that: It also includes a plurality of disc-shaped slip rings (8) fitted onto the mounting rod (51) and located within the heating power supply housing (9).

5. The variable frontal heating area device for the methanol engine intake duct according to claim 1, characterized in that: It also includes multiple temperature sensors (10), with two adjacent housings (111) connected by a connecting unit (12), and at least one of the temperature sensors (10) mounted on one or more of the connecting units (12).

6. The variable-area inlet heating device for a methanol engine according to claim 5, characterized in that: The intake heating unit (11) is an even number and is grouped in pairs. A temperature sensor (10) is installed on the transfer unit (12) between the two groups of intake heating units (11).

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