Leakage-proof air inlet pressure sensor of engine

Abstract

The utility model is applicable to the technical field of engine air inlet systems, and provides an engine leakproof air inlet pressure sensor, which comprises a sensor body, a cavity is arranged in the sensor body, an air inlet manifold is arranged at the top of the sensor body, a first sealing groove and a second sealing groove are arranged on the outer side of the air inlet manifold, and the first sealing groove and the second sealing groove are communicated with each other. The top of the intake manifold is connected with an expansion bolt; according to the utility model, the first sealing groove and the second sealing groove are arranged on the outer side of the intake manifold and are respectively sleeved with the sealing ring and the memory alloy ring, and the shape memory characteristic of the memory alloy ring when the temperature is changed is utilized, so that the continuous pressure on the sealing part can still be kept even in a high-temperature environment; the problem of sealing failure caused by aging deformation of a traditional rubber sealing ring at a high temperature is effectively solved, so that the anti-leakage capability of the sensor is greatly improved, and stable use of equipment under complex working conditions is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine intake system, and in particular relates to an engine leak-proof intake pressure sensor. Background Technology

[0002] In modern engine control systems, the intake pressure sensor is a key component that plays an important role in monitoring the air pressure entering the engine cylinders. Its working principle is to connect to the intake manifold through a vacuum tube. As the engine is under different speed and load conditions, it senses the changes in vacuum in the intake manifold and converts the changes in the internal resistance of the sensor into a voltage signal, which is transmitted to the engine control unit. Based on these signals, the engine control unit adjusts the fuel injection quantity and ignition timing to optimize engine performance and fuel economy.

[0003] In practical applications, existing intake pressure sensors operate in complex environments, such as the engine compartment, where they must withstand high temperatures. Under these conditions, the traditional rubber sealing rings used for sealing are prone to aging and deformation, leading to seal failure and affecting the use of the equipment. Therefore, an engine leak-proof intake pressure sensor is needed to solve these problems. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an engine leak-proof intake pressure sensor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An engine leak-proof intake pressure sensor includes a sensor body with an internal cavity. An intake manifold is located on the top of the sensor body. A first sealing groove and a second sealing groove are located on the outer side of the intake manifold. An expansion bolt is connected to the top of the intake manifold. A sealing ring is fitted inside the first sealing groove, and a shape memory alloy ring is fitted inside the second sealing groove.

[0007] In a further technical solution, a connector is attached to the top of the expansion bolt. The connector is tapered and made of shape memory alloy.

[0008] In a further technical solution, the intake manifold is located above the cavity, and a heat insulation pad is connected to the bottom of the cavity.

[0009] In a further technical solution, a pressure-sensitive element is connected to the bottom of the heat insulation pad, the pressure-sensitive element is annular, a compressed air pump is sleeved in the middle of the pressure-sensitive element, a pulse valve is connected to the top of the compressed air pump, and the pulse valve is connected through to the top of the heat insulation pad.

[0010] Further technical solution: On both sides at one end of the sensor body, there are connecting lug plates, and at the other end of the sensor body, there is an interface.

[0011] Further technical solution: At the top of the sensor body, there is a pressure relief valve, and the pressure relief valve is connected through the cavity.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] In the present utility model, a first sealing groove and a second sealing groove are provided on the outer side of the intake manifold, and a double-sealing design of respectively sleeving a sealing ring and a shape memory alloy ring is adopted. Utilizing the shape memory characteristic of the shape memory alloy ring when the temperature changes, even in a high-temperature environment, it can still maintain a continuous pressure on the sealing part, effectively compensating for the sealing failure problem caused by the aging and deformation of the traditional rubber sealing ring at high temperature, thereby greatly improving the leak prevention ability of the sensor and ensuring the stable use of the device under complex working conditions;

[0014] In the present utility model, the heat insulation pad sleeve connected to the bottom of the cavity can effectively block the high temperature generated by the engine from being transmitted to the pressure-sensitive element, reduce the influence of high temperature on pressure measurement, ensure the working stability and measurement accuracy of the pressure-sensitive element, and at the same time, the compressed air pump sleeved in the middle of the pressure-sensitive element and the pulse valve connected to its top can adjust and compensate the pressure as needed, further improving the measurement accuracy of the sensor under different working conditions.

[0015] In order to more clearly elaborate the structural features and functions of the present utility model, the following will combine the drawings and specific embodiments to detail the present utility model. Brief Description of the Drawings

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the main body of the present utility model;

[0017] Figure 2 It is a cross-sectional plane structural schematic diagram of the main body of the present utility model;

[0018] Figure 3 It is a structural schematic diagram of the intake manifold of the present utility model;

[0019] Figure 4 For the present utility model Figure 2 The enlarged three-dimensional structural schematic diagram in it.

[0020] In the figure: 1. Sensor body; 2. Cavity; 3. Intake manifold; 4. First sealing groove; 5. Second sealing groove; 6. Expansion bolt; 7. Sealing ring; 8. Shape memory alloy ring; 9. Pressure-sensitive element; 10. Compressed air pump; 11. Pulse valve; 12. Connecting lug plate; 13. Interface; 14. Connector; 15. Heat insulation pad sleeve; 16. Pressure relief valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] like Figures 1-4 As shown, this utility model embodiment provides an engine leak-proof intake pressure sensor, including a sensor body 1, a cavity 2 inside the sensor body 1, an intake manifold 3 on the top of the sensor body 1, a first sealing groove 4 and a second sealing groove 5 on the outer side of the intake manifold 3, an expansion bolt 6 connected to the top of the intake manifold 3, a sealing ring 7 inside the first sealing groove 4, and a shape memory alloy ring 8 inside the second sealing groove 5.

[0024] In this embodiment, a first sealing groove 4 and a second sealing groove 5 are provided on the outside of the intake manifold 3, and a double sealing design of sealing ring 7 and shape memory alloy ring 8 is respectively fitted in. By utilizing the shape memory characteristics of shape memory alloy ring 8 when the temperature changes, it can still maintain continuous pressure on the sealing part even in high temperature environment, effectively making up for the sealing failure problem caused by the aging and deformation of traditional rubber sealing ring 7 at high temperature.

[0025] like Figure 2 , Figure 3 and Figure 4 As shown, specifically, the top of the expansion bolt 6 is connected to a connector 14, which is tapered and made of shape memory alloy.

[0026] The intake manifold 3 is located above the cavity 2, and the bottom of the cavity 2 is connected to the heat insulation sleeve 15;

[0027] The bottom of the heat insulation pad 15 is connected to a pressure-sensitive element 9, which is annular. A compressed air pump 10 is sleeved in the middle of the pressure-sensitive element 9. A pulse valve 11 is connected to the top of the compressed air pump 10, and the pulse valve 11 is connected through to the top of the heat insulation pad 15.

[0028] The sensor body 1 has ear plates 12 connected to both sides at one end, and an interface 13 is provided at the other end of the sensor body 1.

[0029] A pressure relief valve 16 is connected to the top of the sensor body 1, and the pressure relief valve 16 is connected to the cavity 2 through it.

[0030] In this embodiment, the tapered connector 14 at the top of the expansion bolt 6 connected to the top of the intake manifold 3 can better fit tightly with the connecting parts during installation. When the engine is started, the shape memory alloy connector 14 deforms due to temperature changes, filling the connection gap, which not only enhances the stability of the connection, but also allows the pressure relief valve 16 connected to the top of the sensor body 1 to penetrate the cavity 2. When the internal pressure of the sensor is too high, the pressure relief valve 16 will automatically open to release excess pressure and prevent damage to the sensor due to excessive pressure. The heat insulation pad 15 connected to the bottom of the cavity 2 can effectively block the high temperature generated by the engine from being transmitted to the pressure sensitive element 9, reducing the impact of high temperature on pressure measurement and ensuring the working stability and measurement accuracy of the pressure sensitive element 9. At the same time, the compressed air pump 10 in the middle of the pressure sensitive element 9 and the pulse valve 11 connected to its top can adjust and compensate the pressure as needed, further improving the measurement accuracy of the sensor under different operating conditions.

[0031] The working principle of this utility model is as follows: First, a first sealing groove 4 and a second sealing groove 5 are set on the outside of the intake manifold 3, and a double sealing design of sealing ring 7 and shape memory alloy ring 8 is respectively fitted in. The expansion bolt 6 connected to the top of the intake manifold 3 has a tapered connector 14 at its top, which can better fit tightly with the connecting parts during installation. Then, when the engine is started, the shape memory alloy connector 14 deforms when the temperature changes, filling the connection gap, which not only enhances the stability of the connection, but also allows the pressure relief valve 16 connected to the top of the sensor body 1 to penetrate the cavity 2. When the internal pressure of the sensor is too high, the pressure relief valve 16 will automatically open to release the excess pressure. The heat insulation pad 15 connected to the bottom of the cavity 2 can effectively block the high temperature generated by the engine from being transmitted to the pressure sensitive element 9, reducing the impact of high temperature on pressure measurement and ensuring the working stability and measurement accuracy of the pressure sensitive element 9. Finally, the compressed air pump 10 in the middle of the pressure sensitive element 9 and the pulse valve 11 connected to its top can adjust and compensate the pressure as needed, further improving the measurement accuracy of the sensor under different working conditions.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An engine leak-proof intake pressure sensor comprising a sensor body (1), characterized in that: The inside of the sensor body (1) is provided with a cavity (2), the top of the sensor body (1) is provided with an air intake manifold (3), the outside of the air intake manifold (3) is provided with a first sealing groove (4) and a second sealing groove (5), the top of the air intake manifold (3) is connected with an expansion bolt (6), the inside of the first sealing groove (4) is sleeved with a sealing ring (7), the inside of the second sealing groove (5) is sleeved with a memory alloy ring (8).

2. The engine leak-proof intake pressure sensor of claim 1, wherein: The top of the expansion bolt (6) is connected with a connector (14), the connector (14) is conical, and the connector (14) is made of memory alloy material.

3. The engine leak-proof intake pressure sensor of claim 1, wherein: The air intake manifold (3) is located above the cavity (2), and the bottom of the cavity (2) is connected with a heat insulation pad sleeve (15).

4. The engine leak-proof intake pressure sensor of claim 3, wherein: The bottom of the heat insulation pad sleeve (15) is connected with a pressure sensitive element (9), the pressure sensitive element (9) is annular, the middle of the pressure sensitive element (9) is sleeved with a compressed air pump (10), the top of the compressed air pump (10) is connected with a pulse valve (11), and the pulse valve (11) is connected with the top of the heat insulation pad sleeve (15) in penetration.

5. The engine leak-proof intake pressure sensor of claim 1, wherein: One end of the sensor body (1) is connected with an ear plate (12) on both sides, and the other end of the sensor body (1) is provided with an interface (13).

6. The engine leak-proof intake pressure sensor of claim 1, wherein: The top of the sensor body (1) is connected with a pressure relief valve (16), and the pressure relief valve (16) is connected with the cavity (2) in penetration.

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