Piston for testing piston temperature field

Abstract

The utility model relates to the field of engine pistons, in particular to a piston for testing a piston temperature field, which comprises a piston top surface, a piston throat, a combustion chamber and a pin boss, a plurality of throat plug holes are arranged at the piston throat, the centers of the plurality of throat plug holes are positioned on a circumference which takes the center of the piston top surface as a circle center and has a diameter D2, a plurality of top face plug holes are formed in the top face of the piston, the centers of the top face plug holes are located on the circumference with the center of the top face of the piston as the circle center and the diameter of D3, a plurality of combustion chamber plug holes are formed in the bottom of the combustion chamber, and the centers of the combustion chamber plug holes are located on the circumference with the center of the top face of the piston as the circle center and the diameter of D1. A plurality of pin seat plug holes are formed in the bottom of the pin seat, hardness plugs are arranged on the throat plug holes, the combustion chamber plug hole and the top face plug hole, and the problem that temperature values of different positions of the piston in operation are not easy to detect at the present stage is solved.

Description

Technical Field

[0001] The utility model relates to the field of engine pistons, in particular to a piston used for testing a piston temperature field. Background Art

[0002] At present, the natural gas engine is an important internal combustion engine. The temperature field generated on the piston when it is working is an important factor affecting its operating performance. Understanding the temperature field and temperature distribution of the engine piston is of great significance to improving the performance of the natural gas engine.

[0003] The piston is the core of the engine. Once there is a problem, it will affect the normal use of the vehicle. As the working intensity of the engine increases, the working environment of the components gradually deteriorates. The engine will generate a lot of heat during operation. If effective cooling measures are not taken, when the temperature exceeds the tolerance range of the components, it may cause damage to the parts. Therefore, it is necessary to analyze the heat load and take certain protective measures to ensure the normal driving of the vehicle.

[0004] A piston for testing the piston temperature field is now proposed to detect the temperature values ​​of different positions of the piston during operation. Utility Model Content

[0005] The purpose of the utility model is to provide a piston for testing the piston temperature field, so as to solve the problem that it is difficult to detect the temperature values ​​of different positions of the piston during operation at the current stage. The technical solution adopted by the utility model is as follows:

[0006] A piston for testing a piston temperature field comprises a piston top surface, a piston throat, a combustion chamber and a pin seat, wherein a plurality of throat plug holes are arranged at the piston throat, wherein the centers of the plurality of throat plug holes are located on a circumference with a diameter of D2 and a center of the piston top surface, a plurality of top surface plug holes are arranged on the piston top surface, wherein the centers of the plurality of top surface plug holes are located on a circumference with a diameter of D3 and a center of the piston top surface, a plurality of combustion chamber plug holes are arranged at the bottom of the combustion chamber, wherein the centers of the plurality of combustion chamber plug holes are located on a circumference with a diameter of D1 and a center of the piston top surface, a plurality of pin seat plug holes are arranged at the bottom of the pin seat, and hardness plugs are arranged on the plurality of throat plug holes, the combustion chamber plug holes and the top surface plug holes.

[0007] It is further defined that a fire bank and a second ring bank are provided on the side wall of the piston, a fire bank plug hole and a second ring bank plug hole are provided on the fire bank and the second ring bank, the distance from the center of the fire bank plug hole to the top surface of the piston is L1, and the distance from the center of the second ring bank plug hole to the top surface of the piston is L2.

[0008] It is further defined that the throat plug hole, top surface plug hole and combustion chamber plug hole are each provided with four, the four throat plug holes are evenly distributed on the circumference and the centers are located on the transverse axis and the longitudinal axis of the piston, the four combustion chamber plug holes are evenly distributed on the circumference and the centers are located on the transverse axis and the longitudinal axis of the piston, the four top surface plug holes are evenly distributed on the circumference clockwise and the centers form an angle of 6° with the longitudinal axis of the piston, there are two pin seat plug holes, the center distance between the pin seat plug hole and the transverse axis of the piston is L3, and the center distance between the two pin seat plug holes is L4.

[0009] It is further defined that the number of the fire shore plug holes and the number of the second ring shore plug holes are both four and are evenly distributed on the fire shore and the second ring shore respectively.

[0010] It is further defined that the size of L1 is 5 mm, the size of L2 is 17.5 mm, the size of L3 is 6 mm, and the size of L4 is 77 mm.

[0011] The beneficial effects of the utility model compared with the current technology are:

[0012] By testing the hardness of the hardness plugs in various parts of the piston, and then converting the temperature change values ​​of different positions of the piston, the temperature of the piston during operation can be mastered to prevent damage to parts due to excessive internal temperature of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a main schematic diagram of the utility model;

[0014] Figure 2 for Figure 1 Middle AA section view;

[0015] Figure 3 It is a rear view schematic diagram of the utility model;

[0016] Figure 4 This is the test working condition diagram of the utility model;

[0017] Figure 5 This is a summary diagram of experimental data of the present utility model.

[0018] The markings in the figure correspond respectively to: 1-piston top surface, 2-piston throat, 3-combustion chamber, 4-pin seat, 5-throat plug hole, 6-top surface plug hole, 7-combustion chamber plug hole, 8-pin seat plug hole, 9-fire shore, 10-second ring shore, 11-fire shore plug hole, 12-second ring shore plug hole. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the utility model, the technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Example:

[0021] like Figure 1-Figure 3 As shown, a piston for testing a piston temperature field comprises a piston top surface 1, a piston throat 2, a combustion chamber 3 and a pin seat 4, four throat plug holes 5 are arranged at the piston throat 2, the centers of the four throat plug holes 5 are located on a circle with a diameter D2 having a center of the piston top surface 1 as the center, and are respectively located on the transverse axis and the longitudinal axis of the piston, four top surface plug holes 6 are arranged on the piston top surface 1, the centers of the four top surface plug holes 6 are located on a circle with a diameter D3 having a center of the piston top surface 1 as the center, the four top surface plug holes 6 are evenly distributed in a clockwise manner and the centers are aligned with the longitudinal axis of the piston. A line or transverse axis forms an angle of 6°, and four combustion chamber plug holes 7 are arranged at the bottom of the combustion chamber 3. The centers of the four combustion chamber plug holes 7 are located on a circle with a diameter of D1 and a center of the piston top surface 1 as the center and are located on the transverse axis and the longitudinal axis of the piston. Two pin seat plug holes 8 are arranged on the bottom of the pin seat 4, which are respectively located on the left and right sides of the bottom of the pin seat 4. The distance between the center of the pin seat plug hole 8 and the transverse axis of the piston is L3, and L3 is 6mm. The center distance between the left and right pin seat plug holes 8 is L4, and L4 is 77mm. The size distance can be determined by oneself according to work requirements.

[0022] A fire bank 9 and a second ring bank 10 are provided on the side wall of the piston, and a fire bank plug hole 11 and a second ring bank plug hole 12 are provided on the fire bank 9 and the second ring bank 10. There are four fire bank plug holes 11 and four second ring bank plug holes 12, which are evenly distributed on the fire bank 9 and the second ring bank 10 respectively. The distance from the center of the fire bank plug hole 11 to the top surface 1 of the piston is L1, and the distance from the center of the second ring bank plug hole 12 to the top surface 1 of the piston is L2. The size of L1 is 5 mm, and the size of L2 is 17.5 mm. The size distance can be determined according to work requirements.

[0023] Hardness plugs are provided in the fire bank plug hole 11, the second ring bank plug hole 12, the throat plug hole 5, the top surface plug hole 6 and the combustion chamber plug hole 7. During the movement of the piston, the hardness of the hardness plug on the piston will change due to the influence of temperature. That is, the hardness of the metal material after quenching decreases with the increase of tempering temperature. As the tempering temperature of the quenched carbon steel gradually increases, the martensite first precipitates extremely fine flake carbide bodies, and then the carbides increase, grow and aggregate into agglomerates until spherical carbides are formed. The metallographic structure of cementite changes continuously, thereby causing the hardness of the material to gradually decrease. The metallographic structure changes of Gcr6 bearing steel when the tempering temperature increases with the same tempering and heat preservation time are shown in the table:

[0024] Tempering holding time / h Tempering temperature / ℃ Metallographic structure Hardness / HV 2 200 Tempered martensite 802-808 2 400 Tempered Troostite 530-546 2 500 Tempered troostite 420-432 2 525 Granular pearlite 280-292

[0025] The temperatures of various parts of the piston form a temperature field. The temperature of the temperature field is converted through the hardness test of the hardness plug, and finally the temperature values ​​of different positions of the piston are obtained. After the hardness plug is installed in the hardness plug hole, the bottom surface shall not protrude from the installation surface.

[0026] The 480 horsepower and 460 horsepower tests were conducted respectively. The piston with the hardness plug was installed on the engine and operated under different working conditions. The rated speed was 1700r / min. The test conditions were as follows: Figure 4 As shown, after the test is completed, it is sent for inspection, and a data is recorded every 1 minute. The test data of 480 horsepower and 460 horsepower are summarized, as shown in the figure below. Figure 5 As shown, it is determined whether the temperatures at the six positions of the piston meet the target value requirements.

[0027] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] The above is a detailed introduction to a piston for testing the piston temperature field provided by the utility model. The description of the specific embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the utility model, several improvements and modifications can be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims

1. A piston for testing a piston temperature field, comprising a piston top surface (1), a piston throat (2), a combustion chamber (3) and a pin seat (4), characterized in that: A plurality of throat plug holes (5) are provided at the throat (2) of the piston, the centers of the plurality of throat plug holes (5) are located on a circumference with a diameter of D2 and a center of the piston top surface (1); a plurality of top surface plug holes (6) are provided on the piston top surface (1), the centers of the plurality of top surface plug holes (6) are located on a circumference with a diameter of D3 and a center of the piston top surface (1); a plurality of combustion chamber plug holes (7) are provided at the bottom of the combustion chamber (3), the centers of the plurality of combustion chamber plug holes (7) are located on a circumference with a diameter of D1 and a center of the piston top surface (1); a plurality of pin seat plug holes (8) are provided at the bottom of the pin seat (4); and hardness plugs are provided on the plurality of throat plug holes (5), the combustion chamber plug holes (7) and the top surface plug holes (6).

2. A piston for testing piston temperature field according to claim 1, characterized in that: A fire bank (9) and a second ring bank (10) are provided on the side wall of the piston, and a fire bank plug hole (11) and a second ring bank plug hole (12) are provided on the fire bank (9) and the second ring bank (10). The distance from the center of the fire bank plug hole (11) to the top surface (1) of the piston is L1, and the distance from the center of the second ring bank plug hole (12) to the top surface (1) of the piston is L2.

3. A piston for testing piston temperature field according to claim 2, characterized in that: The throat plug hole (5), the top surface plug hole (6) and the combustion chamber plug hole (7) are each provided with four, the four throat plug holes (5) are evenly distributed around the circumference and their centers are located on the transverse axis and the longitudinal axis of the piston, the four combustion chamber plug holes (7) are evenly distributed around the circumference and their centers are located on the transverse axis and the longitudinal axis of the piston, the four top surface plug holes (6) are evenly distributed around the circumference clockwise and their centers form an angle of 6° with the longitudinal axis of the piston, the pin seat plug holes (8) are provided with two, the distance between the center of the pin seat plug hole (8) and the transverse axis of the piston is L3, and the center distance between the two pin seat plug holes (8) is L4.

4. A piston for testing piston temperature field according to claim 2, characterized in that: The fire bank plug hole (11) and the second ring bank plug hole (12) are both provided with four, and are evenly distributed on the fire bank (9) and the second ring bank (10) respectively.

5. A piston for testing piston temperature field according to claim 3, characterized in that: The size of L1 is 5 mm, the size of L2 is 17.5 mm, the size of L3 is 6 mm, and the size of L4 is 77 mm.

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