Indicator valve for internal combustion engine

Abstract

The utility model belongs to the internal combustion engine technical field, concretely relates to a kind of internal combustion engine indicator valve, including the valve body being set on cylinder cover, the air inlet hole is set in valve body bottom, the air outlet hole is set in valve body top, the valve cavity that is connected with the air inlet hole and the air outlet hole is set in valve body interior, valve body includes the mounting base and pressure measuring boss of integrally formed setting, pressure measuring boss is set and extends upwards from mounting base and the vertical center reference surface of pressure measuring boss and the vertical center reference surface of mounting base form installation deflection angle;Valve cavity one end is butt-jointed and is provided with guide connecting sleeve, guide connecting sleeve one end is located in pressure measuring boss interior, guide connecting sleeve other end extends outward and passes out pressure measuring boss, valve rod is rotatably set in guide connecting sleeve, valve rod one end extends outward and passes out guide connecting sleeve and the end of valve rod away from guide connecting sleeve is provided with lock nut.The device can reduce the number of parts, has higher operation reliability under harsh working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of internal combustion engine technology, and specifically relates to an indicator valve for an internal combustion engine. Background Technology

[0002] Internal combustion engine cylinder heads typically have indicator valves installed. These valves are connected to pressure gauges to detect cylinder combustion pressure, generate indicator diagrams, or release high-pressure gases before maintenance. A schematic diagram of the widely used Y-type indicator valve is shown below. Figure 6 As shown, its explosion diagram is as follows: Figure 7 As shown, while the Y-type indicator valve is reliable, it has significant drawbacks: First, its complex structure with over ten parts leads to high manufacturing costs and cumbersome assembly. Furthermore, the valve stem is prone to loosening under continuous engine vibration, posing a risk of gas leakage. Second, the large valve body of the Y-type indicator valve makes it susceptible to interference with adjacent cylinder heads or components, requiring adjustment of the outlet orientation during installation and making maintenance inconvenient. With the increasingly compact spatial layout of modern internal combustion engines, the space on top of the cylinder head is becoming increasingly limited, further amplifying the shortcomings of the traditional Y-type indicator valve in terms of space occupation, structural complexity, and vibration resistance.

[0003] Chinese patent CN107461501A discloses a diesel engine indicator valve, including a shaft flange, a valve body, and a safety valve body. A standard shaft is fitted onto the shaft flange, and the valve body is fitted onto the top of the standard shaft. A through hole is provided in the valve body, connecting its two sides. A hexagonal plug and a valve core are respectively provided at both ends of the through hole of the valve body. A valve connector and a safety valve body are fitted onto the top of the valve body. A through hole connecting the valve body is provided in the center of the valve connector. A cavity is provided in the safety valve body, and a through hole connecting the valve body is provided at the bottom of the cavity. A safety valve is provided at the bottom end of the cavity. A countersunk hole is provided at the top of the safety valve, and a spring is safely placed inside the countersunk hole. A spring support is provided at the top of the spring, and an adjusting screw is fitted onto the top of the spring support. A spring seat is arranged around the adjusting screw, and the spring seat is located above the spring support. The spring seat is fitted onto the top of the safety valve body. This patent can solve the technical problems of installation trouble and poor reliability caused by the safety valve and indicator valve being installed in different positions in existing diesel engines, which poses safety hazards. However, the patent has a complex structure and a large number of parts, and the probability of component failure is higher under harsh working conditions of high pressure and high vibration. At the same time, the valve core of this patent is only fixed by a cylindrical pin and a nut. Under the strong vibration of the internal combustion engine, the valve core is prone to loosening, resulting in sealing failure and gas leakage. Utility Model Content

[0004] The purpose of this invention is to provide an indicator valve for an internal combustion engine that can reduce the number of parts, lower the requirements for installation space, and resist the continuous and severe vibration of the internal combustion engine, thus having higher operational reliability under harsh working conditions.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: An indicator valve for an internal combustion engine includes a valve body mounted on a cylinder head. The valve body has an intake port at its bottom and an outlet port at its top. An internal valve cavity connects the intake port and the outlet port. The valve body includes an integrally formed mounting base and a pressure-measuring boss. The pressure-measuring boss extends upward from the mounting base, and its vertical center reference plane forms an installation deflection angle with the vertical center reference plane of the mounting base. A guide connecting sleeve is abutted at one end of the valve cavity. One end of the guide connecting sleeve is located inside the pressure-measuring boss, and the other end extends outward through the pressure-measuring boss. A valve stem is rotatably mounted inside the guide connecting sleeve. One end of the valve stem extends outward through the guide connecting sleeve, and a locking nut is provided at the end of the valve stem furthest from the guide connecting sleeve.

[0006] Furthermore, the installation deflection angle is greater than 0° and less than or equal to 90°.

[0007] Furthermore, both the valve cavity and the guide connecting sleeve are cylindrical, with the axis of the guide connecting sleeve coinciding with the axis of the valve cavity and the guide connecting sleeve and the valve cavity communicating with each other.

[0008] Furthermore, a sealing cone is provided at the end of the valve stem away from the locking nut, and the sealing cone penetrates the guide connecting sleeve and extends into the valve cavity.

[0009] Furthermore, the valve cavity is equipped with a conical sealing surface that fits the sealing cone.

[0010] Furthermore, a sealing pressure ring is provided on the valve stem to cooperate with the guide connecting sleeve.

[0011] Furthermore, the mounting base is provided with bolt holes, and bolts are fixedly installed in the bolt holes to fit the cylinder head.

[0012] Furthermore, the bottom surface of the valve body is provided with a downwardly protruding sealing part, and the cylinder head is provided with a mounting hole to match the sealing part.

[0013] Furthermore, a disc spring is provided between the locking nut and the guide sleeve.

[0014] Furthermore, the vent is equipped with connecting threads.

[0015] The beneficial effects of this utility model are as follows: This invention, by setting the valve body as an integrated structure of the mounting base and the pressure measuring boss, eliminates the need for additional connecting pipes and joints, reducing the number of parts. This not only lowers manufacturing costs and assembly complexity but also improves the overall structural rigidity and sealing reliability of the indicator valve. An installation deflection angle is provided between the mounting base and the pressure measuring boss, overcoming the installation interference problem caused by the large size and difficult orientation adjustment of traditional Y-type indicator valves. This allows for better adaptation to the compact space layout of the cylinder head top, avoiding interference with adjacent components and improving installation and maintenance convenience. The locking nut, in conjunction with the disc spring, can resist the severe vibrations during continuous operation of the internal combustion engine, preventing valve stem loosening and providing higher operational reliability under harsh conditions of high pressure and high vibration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model installed on the cylinder head; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 3 This is a partial structural cross-sectional view of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the valve body, bolt holes, and air outlet in this utility model; Figure 6 This is a schematic diagram of the structure of a Y-type indicator valve in the background art; Figure 7 This is an exploded schematic diagram of a Y-type indicator valve in the background art; In the picture: 1. Cylinder head; 2. Valve body; 201. Mounting base; 202. Pressure measuring boss; 3. Inlet port; 4. Outlet port; 5. Valve cavity; 6. Guide connecting sleeve; 7. Valve stem; 8. Locking nut; 9. Sealing cone; 10. Sealing pressure ring; 11. Bolt hole; 12. Sealing part; 13. Butterfly spring. Detailed Implementation

[0017] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0018] Example 1 like Figure 1-5As shown, the internal combustion engine indicator valve includes a valve body 2 mounted on the cylinder head 1. The valve body 2 has an intake port 3 at its bottom and an outlet port 4 at its top. The valve body 2 has a valve cavity 5 inside, connecting the intake port 3 and the outlet port 4. The valve body 2 includes an integrally formed mounting base 201 and a pressure measuring boss 202. The pressure measuring boss 202 extends upward from the mounting base 201, and its vertical center reference plane forms an installation deflection angle with the vertical center reference plane of the mounting base 201. A guide connecting sleeve 6 is connected to one end of the valve cavity 5. One end of the guide connecting sleeve 6 is located inside the pressure measuring boss 202, and the other end extends outward through the pressure measuring boss 202. A valve stem 7 is rotatably mounted inside the guide connecting sleeve 6. One end of the valve stem 7 extends outward through the guide connecting sleeve 6, and a locking nut 8 is located at the end of the valve stem 7 furthest from the guide connecting sleeve 6.

[0019] By setting the valve body 2 as an integrated structure of mounting base 201 and pressure measuring boss 202, additional connecting pipes and joints are eliminated, significantly reducing the number of parts, manufacturing costs and assembly complexity, while improving the overall structural rigidity and sealing reliability of the indicator valve. The installation deflection angle formed between mounting base 201 and pressure measuring boss 202 overcomes the installation interference problem caused by the large size and difficult orientation adjustment of traditional Y-type indicator valves, and can better adapt to the compact space layout of the top of cylinder head 1, avoiding interference with adjacent components.

[0020] The installation deflection angle is greater than 0° and less than or equal to 90°. The installation deflection angle ensures that the pressure measuring boss 202 can avoid surrounding components at the optimal angle.

[0021] Both the valve cavity 5 and the guide connecting sleeve 6 are cylindrical. The axis of the guide connecting sleeve 6 coincides with the axis of the valve cavity 5, and the guide connecting sleeve 6 and the valve cavity 5 are interconnected. The valve cavity 5 and the guide connecting sleeve 6 provide axial guidance for the rotational movement of the valve stem 7, ensuring the reliability of the seal.

[0022] A sealing cone 9 is provided at the end of the valve stem 7 away from the locking nut 8. The sealing cone 9 passes through the guide connecting sleeve 6 and extends into the valve cavity 5.

[0023] The valve cavity 5 is equipped with a conical sealing surface that fits into the sealing cone 9. The conical sealing surface fits into the sealing cone 9 to form a reliable seal, which can cope with the high-frequency and high-pressure operating conditions of the internal combustion engine.

[0024] A sealing ring 10 is provided on the valve stem 7 to cooperate with the guide connecting sleeve 6. The sealing ring 10 can dynamically seal the gap between the valve stem 7 and the guide connecting sleeve 6 to prevent high-pressure gas from leaking outward along the gap of the valve stem 7.

[0025] The mounting base 201 is provided with bolt holes 11, and bolts are fixedly installed in the bolt holes 11 to fit the cylinder head 1.

[0026] The bottom surface of the valve body 2 is provided with a downward protruding sealing part 12, and the cylinder head 1 is provided with a mounting hole to match the sealing part 12.

[0027] A disc spring 13 is provided between the locking nut 8 and the guide connecting sleeve 6. The disc spring 13 can resist the continuous and severe vibration of the internal combustion engine and prevent the valve stem 7 from rotating and loosening on its own during operation.

[0028] The vent 4 has internal connecting threads. These threads facilitate quick and reliable connection of pressure gauges and other measuring devices to the vent 4, ensuring the sealing of the measuring interface.

Claims

1. A power indicator valve for an internal combustion engine, comprising a valve body (2) disposed on a cylinder head (1), an air inlet (3) disposed at the bottom of the valve body (2), an air outlet (4) disposed at the top of the valve body (2), and a valve cavity (5) disposed inside the valve body (2) connecting the air inlet (3) and the air outlet (4), characterized in that, The valve body (2) includes an integrally formed mounting base (201) and a pressure measuring boss (202). The pressure measuring boss (202) extends upward from the mounting base (201) and the vertical center reference plane of the pressure measuring boss (202) forms an installation deflection angle with the vertical center reference plane of the mounting base (201). A guide connecting sleeve (6) is connected to one end of the valve cavity (5). One end of the guide connecting sleeve (6) is located inside the pressure measuring boss (202), and the other end of the guide connecting sleeve (6) extends outward through the pressure measuring boss (202). A valve stem (7) is rotatably arranged inside the guide connecting sleeve (6). One end of the valve stem (7) extends outward through the guide connecting sleeve (6), and a locking nut (8) is provided at the end of the valve stem (7) away from the guide connecting sleeve (6).

2. The indicator valve for an internal combustion engine according to claim 1, characterized in that, The installation deflection angle must be greater than 0° and less than or equal to 90°.

3. The indicator valve for an internal combustion engine according to claim 1, characterized in that, Both the valve cavity (5) and the guide connecting sleeve (6) are cylindrical. The axis of the guide connecting sleeve (6) coincides with the axis of the valve cavity (5) and the guide connecting sleeve (6) and the valve cavity (5) are interconnected.

4. The indicator valve for an internal combustion engine according to claim 1, characterized in that, A sealing cone (9) is provided at the end of the valve stem (7) away from the locking nut (8). The sealing cone (9) passes through the guide connecting sleeve (6) and extends into the valve cavity (5).

5. The indicator valve for an internal combustion engine according to claim 4, characterized in that, The valve cavity (5) is fitted with a sealing cone (9) with a conical sealing surface.

6. The indicator valve for an internal combustion engine according to claim 1, characterized in that, A sealing pressure ring (10) is provided on the valve stem (7) in conjunction with the guide connecting sleeve (6).

7. The indicator valve for an internal combustion engine according to claim 1, characterized in that, The mounting base (201) is provided with bolt holes (11), and bolts are fixedly installed in the bolt holes (11) to fit the cylinder head (1).

8. The indicator valve for an internal combustion engine according to claim 1, characterized in that, The bottom surface of the valve body (2) is provided with a downward protruding sealing part (12), and the cylinder head (1) is provided with a mounting hole to match the sealing part (12).

9. The indicator valve for an internal combustion engine according to claim 1, characterized in that, A disc spring (13) is provided between the locking nut (8) and the guide connecting sleeve (6).

10. The indicator valve for an internal combustion engine according to claim 1, characterized in that, The vent (4) has a connecting thread inside.

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