Oil nozzle for measurement, oil injector and oil nozzle bulb temperature peak value measurement method

Abstract

The oil nozzle comprises an oil nozzle body, an oil nozzle ball head is arranged at the front end of the oil nozzle body in a protruding mode, a spraying hole communicated with the outside is formed in the oil nozzle ball head, at least one containing cavity is formed in the position, close to the spraying hole, of the front end of the oil nozzle body, and the containing cavity is filled with a sensing part with the temperature-hardness sensitive characteristic. And the sensing part is matched with the accommodating cavity in shape. The invention further discloses a fuel injector using the fuel injection nozzle for measurement. The invention further provides a measuring method for measuring the temperature peak value of a ball head through the fuel injection nozzle. The invention has the advantages of high measurement accuracy and reliability, simple test piece structure and short manufacturing period.

Description

Technical Field

[0001] The invention relates to the field of diesel engine parts manufacturing and measurement, and in particular to a fuel injection nozzle and a fuel injector for measurement, and a method for measuring the temperature peak value of a fuel injection nozzle ball head. Background Art

[0002] In the diesel engine manufacturing industry, multi-cylinder diesel engines generally use diesel common rail injection systems to achieve accurate injection of each cylinder. Among them, the temperature of the nozzle ball head is a key indicator to measure the performance of the injector. Excessive nozzle ball head temperature may cause the performance of the nozzle material to decay and the spray hole to coke, thereby affecting the service life of the injector and the overall performance of the engine. Therefore, accurately measuring the nozzle ball head temperature is of great significance to ensure and improve the product performance of the injector.

[0003] At present, the commonly used method for measuring the temperature of the nozzle ball head is the embedded thermocouple temperature measurement method, that is, the temperature is measured by the embedded thermocouple. The measurement operation process is as follows: after the nozzle is processed, first drill an elongated hole on the nozzle and the injector body; then, install a soft plug at the front end of the nozzle to prevent gas leakage during the engine test. Next, assemble the nozzle and the injector body. Finally, insert the thermocouple into the elongated hole from the top, and make its head as close to the spray hole as possible, so as to accurately measure the temperature of the nozzle ball head.

[0004] However, the above-mentioned embedded thermocouple temperature measurement method has some shortcomings:

[0005] 1. High difficulty in processing and assembly: In the actual operation process, the drilling process of slender holes often deviates, such as punching through, not punching through, or inaccurate position of the thermocouple head, resulting in a high scrap rate of samples.

[0006] 2. Thermocouple material itself is easy to damage: Thermocouple material itself is relatively fragile and easy to be damaged during subsequent assembly and use, which affects the accuracy and reliability of measurement.

[0007] 3. Long production cycle: The injector for measurement can only be produced after the design of the injector nozzle is finalized, and the entire production cycle is long, which is not suitable for the compact requirements of the product development cycle.

[0008] 4. Limited measurement accuracy: Since the thermocouple is located far from the injection hole, the temperature of the injection hole surface cannot be accurately measured. At the same time, this method can only measure the average temperature, but cannot measure the peak temperature, which limits the measurement accuracy.

[0009] 5. Complex test operation: In the engine test, for data collection, it is necessary to open a hole in the engine cover to pass the thermocouple harness. This not only increases the complexity of the test, but may also have an adverse effect on the sealing and overall performance of the engine. Summary of the invention

[0010] The purpose of the present invention is to provide a measuring fuel injector which can improve the measurement accuracy of the temperature of the fuel injector ball head and reduce the difficulty of processing and assembling and shorten the production cycle.

[0011] Another object of the present invention is to provide a fuel injector using the above-mentioned measuring fuel injection nozzle.

[0012] Another object of the present invention is to provide a method for measuring the temperature of a fuel injector bulb. The method uses the above-mentioned fuel injector capable of measuring the temperature of a fuel injector bulb. The method can accurately measure the temperature of the fuel injector bulb and is easy to operate.

[0013] To achieve the above-mentioned purpose, the present invention proposes a measuring fuel injector, comprising a fuel injector body, a fuel injector ball head protruding from the front end of the fuel injector body, a spray hole connected to the outside is opened in the fuel injector ball head, and at least one accommodating cavity is opened at the front end of the fuel injector body near the spray hole, and a sensing component with temperature-hardness sensitive characteristics is filled in the accommodating cavity, and the sensing component is adapted to the shape of the accommodating cavity.

[0014] In the measuring fuel injector as described above, the sensing component is made of carbon steel after quenching treatment.

[0015] The measuring fuel injector as described above, wherein the sensing component is tightly matched with the inner wall of the accommodating cavity.

[0016] In the measuring fuel injector as described above, the lower end surface of the sensing component is flush with the lower opening end of the accommodating cavity.

[0017] In the measuring fuel injector as described above, the accommodating cavity is arranged in a direction parallel to the central axis of the fuel injector body.

[0018] In the measuring fuel injector as described above, the accommodating cavity is arranged along a direction inclined to the central axis of the fuel injector body.

[0019] In the measuring fuel injector as described above, the accommodating cavity is arranged to be inclined from bottom to top and gradually approach the central axis direction of the fuel injector body.

[0020] In the measuring fuel injector as described above, the accommodating cavity is arranged to be inclined gradually away from the central axis direction of the fuel injector body from bottom to top.

[0021] The measuring fuel injector as described above, wherein the accommodating cavity is a through cavity with openings on both sides, one opening of which is a first side port opened at the front end of the fuel injector, and the other opening of which is a second side port opened on the outer wall of the fuel injector body.

[0022] In the measuring fuel injector as described above, the accommodating cavity is cylindrical, prism-shaped, truncated cone-shaped or hemispherical; correspondingly, the sensing component is also cylindrical, prism-shaped, truncated cone-shaped or hemispherical.

[0023] The measuring fuel injector as described above, wherein a plurality of the accommodating cavities are provided along the circumferential direction at the front end of the fuel injector body.

[0024] The present invention further provides a fuel injector, comprising a fuel injector body and the above-mentioned measuring fuel injection nozzle, wherein the measuring fuel injection nozzle and the fuel injector body are assembled into an integral structure.

[0025] The present invention further proposes a method for measuring the peak temperature of a fuel injection nozzle ball head. The fuel injection nozzle for measurement as described above is used in an engine test. The method comprises:

[0026] Insert the sensing component into the accommodating cavity from the front end of the fuel injector body;

[0027] Run the engine for the scheduled test duration;

[0028] After the engine test is completed, the fuel injector is taken out, and the sensing component at the fuel injection nozzle of the fuel injector is taken out from the accommodating chamber;

[0029] After the induction component is polished, a hardness tester is used to measure the current hardness value of the induction component, and then a hardness-temperature calibration curve is used to determine the temperature value corresponding to the current hardness value, thereby obtaining the peak working temperature of the fuel injection nozzle ball head.

[0030] In the method for measuring the temperature peak value of the ball head of the fuel injection nozzle as described above, the sensing component and the inner wall of the accommodating cavity are in interference fit or threaded fit.

[0031] The method for measuring the peak temperature of the nozzle ball head as described above, wherein the accommodating cavity is arranged to be inclined from bottom to top and gradually away from the central axis direction of the nozzle body, and the two sides of the accommodating cavity are opened to form a through cavity, one side opening of which is a first side port opened at the front end of the nozzle, and the other side opening of which is a second side port opened on the outer wall of the nozzle body;

[0032] A push rod is pushed against one side of the sensing component from the second side port, and the sensing component is pushed to move along the inner wall of the accommodating cavity toward the first side port by applying force to the push rod, and then withdraws from the accommodating cavity from the first side port.

[0033] In the method for measuring the peak temperature of the fuel injector ball head as described above, when a plurality of the accommodating cavities are provided along the circumferential direction at the front end of the fuel injector body and the sensing components are respectively filled in each of the accommodating cavities,

[0034] Turn off the fuel injector and take out each sensing component from its respective accommodating chamber;

[0035] The current hardness value of each sensing component is measured and obtained by a hardness tester, and then the temperature values ​​corresponding to the current hardness values ​​are determined using the sensing component hardness-temperature calibration curve, so as to obtain the working temperature peak value of each sensing component, and the maximum value of the working temperature peak value at each position is taken to obtain the working temperature peak value of the injector nozzle ball head.

[0036] The present invention has the following characteristics and advantages:

[0037] 1. Compared with the existing embedded thermocouple temperature measurement method, the present invention eliminates the elongated holes and thermocouples on the fuel injector and the fuel injector body, and opens a receiving cavity at the front end of the fuel injector body near the spray hole, and fills the receiving cavity with a sensing component with temperature-hardness sensitive characteristics, thereby obtaining the fuel injector ball head temperature peak value of the fuel injector during the engine test, which is an important indicator for evaluating the performance quality of the fuel injector. The technical solution of the present invention greatly reduces the difficulty of processing and assembly, and improves the measurement accuracy and reliability.

[0038] 2. The present invention uses carbon steel after quenching treatment, whose hardness is close to that of steel fuel injectors, and is not easy to be damaged, further ensuring the measurement accuracy and reliability. In addition, in the manufacturing process of the fuel injector for measuring the present invention, the sensing component can be pre-pressed into the accommodating cavity before the nozzle hole of the fuel injector is punched, which can greatly reduce the manufacturing cycle of the fuel injector for measuring.

[0039] 3. Since the accommodating chamber and the sensing component of the present invention are located close to the spray hole, the surface temperature of the fuel injection nozzle can be detected, thereby improving the accuracy of the measurement result.

[0040] 4. The present invention has a simple structure and can be measured without a wiring harness, thus avoiding adverse effects on the sealing and overall performance of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0042] Figure 1A It is a schematic diagram of the axial cross-sectional structure of the first embodiment of the fuel injection nozzle for measurement of the present invention;

[0043] Figure 1B for Figure 1A A schematic diagram of the enlarged structure of the unfilled sensing component in part A;

[0044] Figure 1C for Figure 1A A schematic diagram of the enlarged structure of the sensing component filled in the middle part A;

[0045] Figure 2A It is a schematic diagram of the axial cross-sectional structure of the second embodiment of the measuring fuel injection nozzle of the present invention;

[0046] Figure 2B for Figure 2A A schematic diagram of the enlarged structure of the unfilled sensing component in part B;

[0047] Figure 2C for Figure 2A A schematic diagram of the enlarged structure of the sensing component filled in the middle B part;

[0048] Figure 3A Schematic diagram of the axial cross-section structure of the third embodiment of the fuel injection nozzle for measurement of the present invention;

[0049] Figure 3B for Figure 3A A schematic diagram of the enlarged structure of the unfilled sensing component in the middle C part;

[0050] Figure 3C for Figure 3A The enlarged structure diagram of the C part filled with the sensing components;

[0051] Figure 4A Schematic diagram of the axial cross-section structure of the fourth embodiment of the fuel injection nozzle for measurement of the present invention;

[0052] Figure 4B for Figure 4A A schematic diagram of the enlarged structure of the unfilled sensing component in the middle D part;

[0053] Figure 4C for Figure 4A The enlarged structural diagram of the D part filled with the sensing component;

[0054] Figure 5 It is a structural schematic diagram of an embodiment of the front end surface of a fuel injection nozzle for measurement of the present invention;

[0055] Figure 6 The hardness-temperature calibration curve of 52100 bearing steel selected for the induction component of the present invention.

[0056] Description of reference numerals:

[0057] 1-injector body; 2-injector ball head; 3-spray hole; 4-accommodating chamber; 5-sensing component; 6-through chamber; 61-first side port; 62-second side port; 7-front end face (shoulder) of the injector body. DETAILED DESCRIPTION

[0058] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0059] As shown in Figure 1 to Figure 6 As shown, the measuring fuel injector proposed in the present invention comprises a fuel injector body 1, a fuel injector ball head 2 is protruding from the front end of the fuel injector body 1, and a spray hole 3 connected to the outside is opened in the fuel injector ball head 2. When the fuel injector is working, the injector control valve is opened, and the fuel is sprayed outward through the spray hole 3. The fuel burns in the engine cylinder, and a part of the heat is transferred to the fuel injector ball head 2 to gradually increase its temperature. In an embodiment of the present invention, a accommodating chamber 4 for filling the sensing component 5 is opened at a position close to the spray hole 3 on the front end surface 7 (also called the shoulder) of the fuel injector body 1. The distance between the opening position of the accommodating chamber 4 on the shoulder and the outlet of the spray hole 3 is 1mm-2mm, and the distance can also be adjusted according to the actual working conditions. Among them, the sensing component 5 has a temperature-hardness sensitive characteristic, that is, within the operating temperature range of the injector, the hardness of the sensing component 5 decreases with increasing temperature, which is in line with the HV-t calibration curve (such as Figure 6 The temperature-hardness unidirectional change correspondence of the sensing component 5 can be selected according to different working conditions and precision requirements. For example, 52100 bearing steel, 4140 bearing steel, GCr6 bearing steel, #35 steel and other carbon steels after quenching treatment, so that the peak working temperature of the nozzle ball head 2 (i.e., the maximum working temperature of the nozzle) under the working state of the injector can be deduced by detecting the hardness of the sensing component 5.

[0060] In an embodiment of the present invention, the shape of the sensing component 5 is adapted to the shape of the accommodating cavity 4, and the accommodating cavity 4 may be cylindrical, prism-shaped, truncated cone, hemispherical or other suitable geometric shapes; accordingly, the sensing component 5 is cylindrical, prism-shaped, truncated cone, hemispherical or other suitable geometric shapes, as long as it is ensured that the sensing component 5 can reach the peak operating temperature of the injector ball head 2 when the injector is working.

[0061] The sensing component 5 is tightly fitted with the inner wall of the accommodating chamber 4, preferably by interference fit, threaded fit, etc. This can prevent the sensing component 5 from falling off and prevent errors caused by gap air pockets between the sensing component 5 and the inner wall of the accommodating chamber 4, thereby improving the reliability of the measurement results.

[0062] like Figure 1C , Figure 2C , Figure 3C As shown, in an embodiment of the present invention, the lower end surface of the sensing component 5 is flush with the lower opening end of the accommodating cavity 4 (i.e., the first side port 61 hereinafter), which has the advantage of simple processing and facilitates pressing the sensing component 5 into the accommodating cavity 4.

[0063] like Figure 1A , Figure 1B , Figure 1C As shown, in the first embodiment of the present invention, the accommodating chamber 4 is arranged in a direction parallel to the central axis of the fuel injector body 1. During installation, the sensing component 5 is inserted into the accommodating chamber 4 upward in a vertical direction, which has the advantage of convenient installation.

[0064] In the second and third embodiments of the present invention, the accommodating chamber 4 is arranged obliquely along the central axis direction of the fuel injector body 1, and the sensing component 5 is inserted upward into the accommodating chamber 4 along the oblique direction. Figure 2A , Figure 2B , Figure 2C As shown in FIG. 1 , as an optional embodiment of the present invention, the accommodating cavity 4 is inclined from bottom to top and gradually approaches the central axis direction of the nozzle body 1, so as to avoid the chamfer of the front edge of the nozzle body and facilitate the processing and forming of the accommodating cavity. Figure 3A , Figure 3B , Figure 3C As shown, as another optional embodiment of the present invention, the accommodating chamber 4 is inclined from bottom to top gradually away from the central axis direction of the injector body 1, so that the lower opening end of the accommodating chamber 4 (i.e., the first side port 61) is closer to the spray hole 3, which is beneficial to improve the measurement accuracy.

[0065] Further, such as Figure 4A , Figure 4B , Figure 4C As shown, the accommodating chamber 4 is a through chamber 6 with openings on both sides, one side opening of the through chamber 6 is provided on the front end surface of the fuel injector, which is a first side port 61; the other side opening is provided at a second side port 62 on the outer wall of the fuel injector body 1. When the fuel injector stops working and needs to remove the sensing component 5 in the accommodating chamber 4, a push rod (not shown in the figure) can be extended into the accommodating chamber 4 from the second side port 62, and the sensing component 5 is pushed to gradually move along the inner wall of the accommodating chamber 4 toward the first side port 61 by applying force to the push rod, and then withdraw from the accommodating chamber 4 from the first side port 61, so as to achieve the effect of quickly disassembling the sensing component 5.

[0066] In the embodiment of the present invention, the number of the accommodating chambers 4 can be set to 1, 2 or more. The provision of multiple accommodating chambers increases the number of measurement points, and enables measurement at different positions near the nozzle ball head 2, thereby improving the reliability of the measurement results. As a preferred implementation, Figure 5 As shown, a plurality of accommodating cavities are provided along the circumferential direction on the front end face 7 of the fuel injector body, and the sensing components 5 are respectively filled in the accommodating cavities, and measurement points are arranged along the circumferential direction of the front end face of the fuel injector body to measure the temperature peaks at different circumferential positions. Of course, in order to improve the reliability of the measurement results, measurement points at different positions can also be randomly arranged on the front end face 7 of the fuel injector body.

[0067] The present invention also provides an injector, comprising an injector body and the measuring injector nozzle as described above, wherein the measuring injector nozzle and the injector body are assembled into an integral structure. The injector of the present invention is a diesel injector, but is not limited thereto, and may also be a gasoline injector, and is applied to the injector test of a gasoline engine.

[0068] When using the measuring fuel injector of the present invention to measure the peak temperature of the fuel injector bulb, the following steps are included:

[0069] Step 10: Insert the sensing component 5 from the front end surface 7 of the fuel injector body into the already opened accommodation cavity 4;

[0070] Step 20: Run the engine for a predetermined test time; the predetermined test time of the engine operation is determined by the test conditions and the set time of the hardness-temperature calibration curve of the sensing component, generally 10 hours to 24 hours.

[0071] Step 30: After the engine test is completed, the fuel injector is taken out, and the sensing component 5 at the fuel injection nozzle of the fuel injector is taken out from the accommodating chamber 4;

[0072] Step 40: After the sensing component 5 is polished (to remove surface impurities), a hardness tester is used to measure the current hardness value of the sensing component 5, and then the temperature value corresponding to the current hardness value is determined by comparing the HV-t calibration curve of the sensing component 5. The corresponding temperature value is the peak operating temperature of the injector ball head 2.

[0073] Furthermore, in step 10, the sensing component 5 and the inner wall of the accommodating cavity 4 are fitted with an interference fit or a threaded fit, which can prevent the sensing component 5 from falling off, thereby improving the reliability of the measurement result.

[0074] Further, such as Figure 4A , Figure 4B , Figure 4CAs shown, in order to quickly and conveniently remove the sensing component 5, step 30 further includes extending a push rod (not shown in the figure) from the second side port 62 into the accommodating chamber 4, and pushing the sensing component 5 along the inner wall of the accommodating chamber 4 toward the first side port 61 by applying force to the push rod, and exiting the accommodating chamber 4 from the first side port 61.

[0075] Furthermore, when a plurality of accommodating cavities 4 are provided at the front end of the fuel injector body and the sensing components 5 are respectively filled in the respective accommodating cavities 4, step 40 further includes measuring the taken out sensing components 5 by means of a hardness tester and obtaining the current hardness value of each sensing component 5, and then determining the corresponding temperature value by comparing with the HV-t calibration curve of the sensing component, thereby obtaining the peak working temperature of each sensing component 5, taking the maximum value of the peak working temperature of each position, thereby obtaining the peak working temperature of the fuel injector ball head.

[0076] In summary, the working principle of the present invention is as follows: the present invention utilizes the temperature-hardness sensitive characteristics of carbon steel after quenching treatment during the tempering process, and other suitable known materials with temperature-hardness sensitive characteristics to manufacture the induction component 5 of the present invention, which is used to measure the temperature peak of the nozzle ball head 2 of the fuel injector in the engine test, thereby providing an important technical indicator basis for evaluating the performance of the fuel injector product. In order to accurately measure the temperature peak of the nozzle ball head, the present invention opens a receiving chamber 4 for filling the induction component 5 at the front end surface 7 (also called shoulder) of the fuel injector body 1 near the spray hole 3 of the nozzle ball head 2. During the engine running test, the induction component 5 heats up and produces a hardness change corresponding to the temperature peak. After the test is completed, the induction component 5 is taken out from the receiving chamber 4, and the current hardness value of the induction component 5 is measured by a hardness tester. The temperature value corresponding to the current hardness value can be obtained by using the HV-t calibration curve, and the temperature value is the temperature peak of the nozzle ball head in the test.

[0077] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A measuring fuel injector, comprising a fuel injector body, a fuel injector ball head protruding from the front end of the fuel injector body, a spray hole communicating with the outside is opened in the fuel injector ball head, characterized in that: At least one accommodating cavity is provided at the front end of the fuel injector body near the spray hole. The accommodating cavity is filled with a sensing component having temperature-hardness sensitive characteristics. The sensing component is adapted to the shape of the accommodating cavity.

2. The measuring fuel injection nozzle according to claim 1, characterized in that: The induction component is made of quenched carbon steel.

3. The measuring fuel injection nozzle according to claim 2, characterized in that: The sensing component is tightly matched with the inner wall of the accommodating cavity.

4. The measuring fuel injection nozzle according to claim 3, characterized in that: The lower end surface of the sensing component is flush with the lower opening end of the accommodating cavity.

5. The measuring fuel injection nozzle according to any one of claims 1 to 4, characterized in that: The accommodating cavity is arranged in a direction parallel to the central axis of the fuel injection nozzle body.

6. The measuring fuel injection nozzle according to any one of claims 1 to 4, characterized in that: The accommodating cavity is arranged along a direction inclined to the central axis of the fuel injection nozzle body.

7. The measuring fuel injection nozzle according to claim 6, characterized in that: The accommodating cavity is inclined from bottom to top and gradually approaches the central axis direction of the fuel injection nozzle body.

8. The measuring fuel injection nozzle according to claim 6, characterized in that: The accommodating cavity is arranged to be inclined gradually away from the central axis direction of the fuel injection nozzle body from bottom to top.

9. The measuring fuel injection nozzle according to claim 8, characterized in that: The accommodating cavity is a through cavity with openings on both sides, one opening of which is a first side port opened at the front end of the fuel injector, and the other opening of which is a second side port opened on the outer wall of the fuel injector body.

10. The measuring fuel injection nozzle according to any one of claims 1 to 4, characterized in that: The accommodating cavity is cylindrical, prism-shaped, truncated cone-shaped or hemispherical; correspondingly, the sensing component is also cylindrical, prism-shaped, truncated cone-shaped or hemispherical.

11. The measuring fuel injection nozzle according to any one of claims 1 to 4, characterized in that: A plurality of accommodating cavities are circumferentially arranged at the front end of the fuel injection nozzle body.

12. A fuel injector, comprising a fuel injector body and a measuring fuel injection nozzle according to any one of claims 1 to 11, wherein the measuring fuel injection nozzle is assembled with the fuel injector body into an integral structure.

13. A method for measuring the peak temperature of a fuel injection nozzle ball head, using the fuel injection nozzle for measurement as claimed in claim 1 in an engine test, the method comprising: Insert the sensing component into the accommodating cavity from the front end of the fuel injector body; Run the engine for the scheduled test duration; After the engine test is completed, the injector is taken out, and the sensing component at the fuel nozzle of the injector is taken out from the accommodating cavity; after the sensing component is polished, a hardness tester is used to measure the current hardness value of the sensing component, and then the hardness-temperature calibration curve is used to determine the temperature value corresponding to the current hardness value, thereby obtaining the peak working temperature of the fuel injector ball head.

14. The method for measuring the peak temperature of the fuel injection nozzle ball head according to claim 13, characterized in that: The sensing component and the inner wall of the accommodating cavity are in interference fit or thread fit.

15. The method for measuring the peak temperature of the fuel injection nozzle ball head according to claim 13, characterized in that: The accommodating cavity is arranged to be inclined gradually away from the central axis direction of the fuel injector body from bottom to top, and the two sides of the accommodating cavity are opened to form a through cavity, one side opening of which is a first side port opened at the front end of the fuel injector, and the other side opening of which is a second side port opened on the outer wall of the fuel injector body; A push rod is pushed against one side of the sensing component from the second side port, and the sensing component is pushed to move along the inner wall of the accommodating cavity toward the first side port by applying force to the push rod, and then withdraws from the accommodating cavity from the first side port.

16. The method for measuring the peak temperature of a fuel injection nozzle ball head according to any one of claims 13 to 15, characterized in that: When a plurality of the accommodating cavities are provided along the circumferential direction at the front end of the fuel injector body and the sensing components are respectively filled in the accommodating cavities, Turn off the fuel injector and take out each sensing component from its respective accommodating chamber; The current hardness value of each sensing component is measured and obtained by a hardness tester, and then the temperature values ​​corresponding to the current hardness values ​​are determined using the sensing component hardness-temperature calibration curve, so as to obtain the working temperature peak value of each sensing component, and the maximum value of the working temperature peak value at each position is taken to obtain the working temperature peak value of the injector nozzle ball head.

Images