Valve guide pipe temperature measuring structure

Abstract

The utility model discloses a temperature measuring structure of a valve guide pipe, a thermocouple is arranged outside the valve guide pipe, a mounting groove is arranged on the outer wall of the valve guide pipe, and the thermocouple is arranged in the mounting groove, and the temperature measuring structure of the valve guide pipe is simple in structure and convenient to measure.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and specifically relates to a valve guide tube temperature measuring structure. Background Art

[0002] The engine valve guide is the core component of the engine. Its main function is to guide the valve, prevent the valve from tilting, and ensure that the valve moves in the vertical direction. The valve guide is press-fitted on the cylinder head with an interference fit. The bottom of the guide is flushed by high-temperature exhaust gas, and the operating temperature often reaches above 300°C. Since the valve guide and the valve are closely matched together, the temperature of the working area of the valve guide is very difficult to measure, but this temperature has a great influence on the wear of the valve guide. If it exceeds the temperature resistance limit of the guide, it will cause serious wear. Therefore, the temperature measurement of the valve guide is very important.

[0003] The invention patent with announcement number CN118067558A disclosed on May 24, 2024 a test method for measuring valve temperature field, which includes the following steps: S1. Through the test, the corresponding curve of the hardness and temperature of the temperature-measured valve material is obtained; S2. The equipment, materials, and ambient temperature are prepared before the test; S3. The running-in operation before the test is carried out; S4. Test conditions: The test is completed according to the valve temperature field test conditions; S5. The hardness of all valve discs, cones, valve stems and other parts is tested, and the corresponding curves of hardness and temperature are compared. The test method for measuring valve temperature field cannot solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide a valve guide temperature measuring structure with simple structure and convenient measurement in view of the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The valve guide temperature measurement structure comprises a thermocouple disposed outside the valve guide, a mounting groove disposed on the outer wall of the valve guide, and the thermocouple located in the mounting groove.

[0007] The valve guide is provided with an oblique angle at the bottom end of the mounting groove, and the bottom end of the thermocouple is provided with a measuring end, the measuring end is a bent structure, and the measuring end is located on one side of the oblique angle.

[0008] A measuring surface is provided between the inner wall of the valve guide tube and the bottom end of the mounting groove, and the end of the measuring end contacts the measuring surface.

[0009] The measuring surface separates the inner cavity of the valve guide and the mounting groove.

[0010] The distance between the measuring surface and the inner wall of the catheter is 0.5 mm.

[0011] The top end of the thermocouple is of an L-shaped structure.

[0012] The valve guide is of a cylindrical structure.

[0013] The technical effects of the present utility model are as follows: By adopting the valve guide temperature measuring structure of the present utility model, the structure of the valve guide is improved, the installation and arrangement of the thermocouple in the valve guide are realized, the temperature measurement of the working area of the valve guide is realized, and the problem that it is difficult to measure the temperature of the existing valve guide is solved; the thermocouple is arranged in the installation groove, its position is stable, and the occupied space is small. Through the setting of the measurement surface, the function of the thermocouple can be ensured to be reliable and the measurement is accurate; it also has the advantages of simple structure, convenient installation and low cost. Description of the Drawings

[0014] This specification includes the following drawings, and the shown contents are respectively:

[0015] Figure 1 It is a schematic structural view of the valve guide temperature measuring structure of the present utility model;

[0016] Figure 2 It is Figure 1 a partial enlarged view of

[0017] Figure 3 It is a cross-sectional view of the valve guide temperature measuring structure of the present utility model.

[0018] The marks in the figure are: 1, valve guide; 2, installation groove; 3, thermocouple; 4, measurement end; 5, measurement surface; 6, bevel angle. Detailed Description of the Preferred Embodiments

[0019] The following is a more detailed description of the specific embodiments of the present utility model by referring to the drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0020] As Figures 1 to 3 shown, in this valve guide temperature measuring structure, a thermocouple 3 is arranged outside the valve guide 1, and an installation groove 2 is arranged on the outer wall of the valve guide 1, and the thermocouple 3 is located in the installation groove 2.

[0021] The working area temperature of the valve guide 1 is measured using a thermocouple 3. The thermocouple 3 can be in direct contact with the substance to be measured, featuring high temperature measurement accuracy, simple structure, easy maintenance, convenient manufacturing, and low cost. The thermocouple 3 responds rapidly to temperature changes and is suitable for dynamic temperature measurement in the working area of the valve guide 1. An installation groove 2 is provided on the outer wall of the valve guide 1. The main body of the thermocouple 3 is located inside the valve guide 1, occupying little space, without being exposed, and not affecting the installation of the valve guide 1. The thermocouple 3 can be installed into the cylinder head together with the valve guide 1. After the thermocouple 3 is fixed, high-temperature glue can be filled into the gap in the installation groove 2 to ensure the integrity of the outer edge of the valve guide 1.

[0022] As Figure 2 shown, an inclined angle 6 is provided at the bottom end of the installation groove 2 on the valve guide 1. The bottom end of the thermocouple 3 is provided with a measuring end 4, and the measuring end 4 is a bent structure, located on one side of the inclined angle 6. The inclined angle 6 is provided to enable a smooth transition of the measuring end 4 of the thermocouple 3, prevent serious bending of the thermocouple 3 during the arrangement of the thermocouple 3, resulting in damage to the thermocouple 3, and also facilitate the positioning and arrangement of the thermocouple 3 during installation. The bottom of the thermocouple 3 is bent to achieve the arrangement of the thermocouple 3 from the axial direction to the radial direction, facilitating ensuring that the measuring end 4 accurately corresponds to the measuring surface 5 and ensuring accurate temperature measurement.

[0023] As Figure 2 shown, a measuring surface 5 is provided between the inner wall of the valve guide 1 and the bottom end of the installation groove 2. The end of the measuring end 4 contacts the measuring surface 5. The measuring surface 5 is closer to the inner wall of the valve guide 1, enabling the thermocouple 3 to accurately measure the temperature. The measuring end 4 uses a direct contact method with the measuring surface 5 to measure the temperature.

[0024] As Figure 2 shown, the measuring surface 5 separates the inner cavity of the valve guide 1 and the installation groove 2. The setting of the measuring surface 5 avoids the communication between the inner cavity of the valve guide 1 and the installation groove 2, prevents air or exhaust gas after combustion from leaking from the measuring surface 5, and also prevents the movement of the valve in the valve guide 1 from interfering with the measuring end 4 of the thermocouple 3, ensuring the functional reliability of the thermocouple 3 and the reliable guiding function of the valve guide 1.

[0025] The distance between the measuring surface 5 and the inner wall of the guide is 0.5 mm. The above structure ensures that the temperature in the working area of the valve guide 1 can be fully transmitted to the measuring end 4 of the thermocouple 3 while ensuring the separation effect between the inner cavity of the valve guide 1 and the installation groove 2.

[0026] As Figure 1 shown, the top end of the thermocouple 3 is an L-shaped structure. The top end of the thermocouple 3 extends out of the installation groove 2, facilitating the arrangement of the thermocouple 3.

[0027] As Figure 1 shown, the valve guide 1 is in a cylindrical structure. The valve guide 1 has a simple structure and is convenient to be assembled in the cylinder head.

[0028] Example: Figures 1 to 3 As shown, a groove with a length of L1 = 43.5 mm is processed on the valve guide 1, and the distance between the bottom of the groove and the bottom of the valve guide 1 is L2 = 5.2 mm. The beginning of the groove adopts a circular hole with a diameter of φA = 1 mm. In order to facilitate the arrangement of the thermocouple 3, a 0.7 mm × 0.7 mm bevel 6B is made to make a smooth transition to prevent the thermocouple 3 from being severely bent when the thermocouple 3 is arranged, resulting in damage to the thermocouple 3. The rear end groove depth H3 = 1.2 mm, the groove width S1 = 1.5 mm. A high-temperature K-type thermocouple 3 with a diameter of 0.5 mm is arranged along the direction of the groove. The head of the thermocouple 3 needs to be close to the measuring surface 5. The measuring surface 5 is 0.5 mm away from the working surface of the valve guide 1. The thermocouple 3 cannot protrude from the valve guide 1 at this distance L1. Pay attention to pressing when arranging it, and you can tie it with a cable tie first. H1 = 2.5 mm, H2 = 3 mm, the difference between the two is the vertical distance between the measuring surface 5 and the inner wall of the valve guide 1. After the thermocouple 3 is placed, high-temperature glue is injected into the gaps of the groove to ensure that all the gaps are filled with high-temperature glue. Place it at room temperature for 24 hours and then put it in an oven heated to 150°C for 4 hours. Then take it out after slow cooling. Finally, scrape off the excess glue on the surface with a metal scraper to make the outer circle of the catheter complete and the diameter consistent with that before the groove is cut.

[0029] The valve guide temperature measurement structure improves the structure of the valve guide 1, realizes the installation and arrangement of the thermocouple 3 in the valve guide 1, realizes the measurement of the temperature of the working area of the valve guide 1, and solves the problem that the temperature of the existing valve guide 1 is difficult to measure; the thermocouple 3 is arranged in the installation groove 2, its position is stable, and the space occupied is small. Through the arrangement of the measuring surface 5, the function of the thermocouple 3 can be ensured to be reliable and the measurement is accurate; it also has the advantages of simple structure, convenient installation and low cost.

[0030] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A valve guide temperature measuring structure, characterized in that: A thermocouple (3) is provided outside the valve guide (1). An installation groove (2) is provided on the outer wall of the valve guide (1), and the thermocouple (3) is located in the installation groove (2). An inclined angle (6) is provided at the bottom end of the installation groove (2) on the valve guide (1). A measurement end (4) is provided at the bottom end of the thermocouple (3). The measurement end (4) is a bent structure and is located on one side of the inclined angle (6). A measurement surface (5) is provided between the inner wall of the valve guide (1) and the bottom end of the installation groove (2), and the end of the measurement end (4) contacts the measurement surface (5).

2. The valve guide temperature measuring structure according to claim 1, characterized in that: The measurement surface (5) separates the inner cavity of the valve guide (1) and the installation groove (2).

3. The valve guide temperature measuring structure according to claim 2, wherein: The distance between the measurement surface (5) and the inner wall of the valve guide (1) is 0.5 mm.

4. The valve guide temperature measuring structure according to any one of claims 1 to 3, characterized in that: The top end of the thermocouple (3) is an L-shaped structure.

5. The valve guide temperature measuring structure according to claim 1, characterized in that: The valve guide (1) is in a cylindrical structure.

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