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CN-117780539-B - Oil nozzle for detecting cleanliness of oil sprayer and detection method

CN117780539BCN 117780539 BCN117780539 BCN 117780539BCN-117780539-B

Abstract

The invention relates to a nozzle tip for detecting the cleanliness of an oil sprayer and a detection method. The invention comprises the steps of cleaning a nozzle tip for detecting the cleanliness of an oil sprayer, replacing the nozzle tip of the oil sprayer assembly with the cleanliness to be detected by a special nozzle tip for detecting the cleanliness, connecting the replaced oil sprayer to a special test bench and working, starting sampling after the oil sprayer starts working, collecting test oil with a preset volume in a high-pressure diesel oil path of the oil sprayer with the cleanliness to be detected, collecting the test oil with the preset volume in a low-pressure diesel loop of the oil sprayer with the cleanliness to be detected, filtering the medium to be detected by filter paper, putting the filter paper with the particles into an electric constant temperature box for drying, and detecting impurities and the particles by using a measuring magnifying glass. The invention can more accurately collect particles larger than the diameter of the spray hole in the oil sprayer, and effectively detect the real cleanliness condition in the oil sprayer assembly.

Inventors

  • YANG SHIQI
  • SONG LERAN
  • LIU YULONG

Assignees

  • 无锡威孚高科技集团股份有限公司

Dates

Publication Date
20260508
Application Date
20231219

Claims (6)

  1. 1. A method for detecting the cleanliness of an oil injector is characterized in that an oil nozzle for detecting the cleanliness of the oil injector is utilized, and the oil nozzle for detecting the cleanliness of the oil injector comprises the following steps: The first needle valve body (1) is provided with a first needle valve body accommodating cavity (1 a), and the bottom end of the first needle valve body accommodating cavity (1 a) is provided with a first sealing seat (1 b) and an oil injection opening end (1 c); The first piston needle valve (2) is in clearance fit with the first needle valve body accommodating cavity (1 a), the head of the first piston needle valve (2) is in seal fit with the first sealing seat (1 b), a first seal intersection line (2 a) is formed between the head of the first piston needle valve (2) and the first sealing seat (1 b) when the head of the first piston needle valve and the first sealing seat are in seal fit, the minimum diameter of the oil injection opening end (1 c) is smaller than the diameter of the first seal intersection line (2 a), and the minimum diameter of the oil injection opening end (1 c) is larger than the diameter of a spray hole (5 c) of an oil nozzle of an oil injector assembly of an oil injector with cleanliness to be detected; The method comprises the following steps: after the oil nozzle for detecting the cleanliness of the oil sprayer is cleaned, replacing the oil nozzle of the oil sprayer assembly of the oil sprayer with the cleanliness detection oil nozzle, and adjusting the lift of the piston needle valve to the upper limit of the assessment of the particle size through a thickening adjusting gasket; connecting the replaced fuel injector to a special test bench, driving the test bench to work, and starting sampling after the fuel injector works; collecting test oil with a preset volume from a high-pressure diesel oil circuit of the to-be-detected cleanliness oil sprayer, and collecting test oil with a preset volume from a low-pressure diesel oil circuit of the to-be-detected cleanliness oil sprayer, wherein the two collected test oils are to-be-detected media; Filtering a medium to be tested through filter paper, and then putting the filter paper with impurities and particles into an electric constant temperature box, and drying at a preset temperature; and detecting impurities and particles on the dried filter paper by using a measuring magnifier.
  2. 2. A method for detecting cleanliness of fuel injector according to claim 1, characterized in that the head of the first piston needle valve (2) is in sealing engagement with the first sealing seat (1 b) by means of a conical surface.
  3. 3. A method for detecting cleanliness of a fuel injector as defined in claim 1, wherein said fuel injector assembly nozzle of said fuel injector of cleanliness to be detected comprises: the second needle valve body (5) is provided with a second needle valve body accommodating cavity (5 a), and the bottom end of the second needle valve body accommodating cavity (5 a) is provided with a second sealing seat (5 b); The second piston needle valve (6) has the same structure as the first piston needle valve (2), and is in clearance fit with the second needle valve body accommodating cavity (5 a), the head of the second piston needle valve (6) is in sealing fit with the second sealing seat (5 b), and when the second piston needle valve (6) and the second sealing seat (5 b) are in sealing fit, a second sealing intersection line (6 a) is formed by the head of the second piston needle valve (6) and the head of the second needle valve body (5) and is provided with a spray hole (5 c).
  4. 4. A method for detecting cleanliness of a fuel injector according to claim 3, characterized in that the fuel injector assembly nozzle tip of the fuel injector to be detected for cleanliness is replaced by the fuel injector nozzle tip for cleanliness detection, in particular by replacing the second needle valve body (5) by the first needle valve body (1).
  5. 5. The method for detecting cleanliness of an oil injector according to any one of claims 1 to 4, wherein a predetermined volume of test oil flowing out of a low pressure circuit of the oil injector is collected when the oil injector is operated.
  6. 6. A method for detecting the cleanliness of a fuel injector according to any one of claims 1 to 4, characterized in that a predetermined volume of test oil is collected from the injection opening end (1 c) of the head of the first needle valve body (1) of the fuel injector for detecting the cleanliness of the fuel injector.

Description

Oil nozzle for detecting cleanliness of oil sprayer and detection method Technical Field The invention relates to the technical field of fuel injection, in particular to a nozzle tip for detecting the cleanliness of a fuel injector and a detection method. Background The cleanliness of the fuel injector affects the performance of the fuel injector and thus the performance of the engine. The traditional cleanliness measuring scheme is to directly collect fuel sprayed out of a spray hole, is limited by the diameter of the spray hole and the lift limit of a needle valve, and cannot effectively collect and detect particles larger than the diameter of the spray hole. At present, the cleanliness of the fuel injector is generally detected by disassembling the fuel injector, the parts of the fuel injector are detected one by one, the detection steps are complicated, the detection method for disassembling the fuel injector is easy to cause particle pollution, and the real cleanliness level of the inside of the fuel injector body is difficult to obtain. Disclosure of Invention Therefore, the invention provides the oil nozzle for detecting the cleanliness of the oil sprayer and the detection method, and the oil nozzle replaces the original oil nozzle of the oil sprayer assembly, so that particles larger than the diameter of a spray hole in the oil sprayer can be more accurately collected, and the actual cleanliness condition in the oil sprayer assembly can be effectively detected. In order to solve the technical problem, the invention provides a nozzle tip for detecting the cleanliness of an oil sprayer, which comprises the following components: The first needle valve body is provided with a first needle valve body accommodating cavity, and the bottom end of the first needle valve body accommodating cavity is provided with a first sealing seat and an oil injection opening end; The first piston needle valve is in clearance fit with the first needle valve body accommodating cavity, the head of the first piston needle valve is in sealing fit with the first sealing seat, and when the head of the first piston needle valve and the first sealing seat are in sealing fit, a first sealing intersection line is formed by the head of the first piston needle valve and the first sealing seat, the minimum diameter of the oil injection opening end is smaller than the diameter of the first sealing intersection line, and the minimum diameter of the oil injection opening end is larger than the diameter of a spray hole of an oil nozzle of an oil injector assembly of the oil injector with cleanliness to be detected. In one embodiment of the present invention, the head of the first piston needle valve is in sealing engagement with the first sealing seat by a tapered surface. The invention also provides a method for detecting the cleanliness of the oil sprayer, which utilizes the oil nozzle for detecting the cleanliness of the oil sprayer; The method comprises the following steps: after the oil nozzle for detecting the cleanliness of the oil sprayer is cleaned, replacing the oil nozzle of the oil sprayer assembly of the oil sprayer with the cleanliness detection oil nozzle, and adjusting the lift of the piston needle valve to the upper limit of the assessment of the particle size through a thickening adjusting gasket; connecting the replaced fuel injector to a special test bench, driving the test bench to work, and starting sampling after the fuel injector works; collecting test oil with a preset volume from a high-pressure diesel oil circuit of the to-be-detected cleanliness oil sprayer, and collecting test oil with a preset volume from a low-pressure diesel oil circuit of the to-be-detected cleanliness oil sprayer, wherein the two collected test oils are to-be-detected media; Filtering a medium to be tested through filter paper, and then putting the filter paper with impurities and particles into an electric constant temperature box, and drying at a preset temperature; and detecting impurities and particles on the dried filter paper by using a measuring magnifier. In one embodiment of the present invention, the fuel injector assembly nozzle tip to be tested for cleanliness includes: The second needle valve body is provided with a second needle valve body accommodating cavity, and the bottom end of the second needle valve body accommodating cavity is provided with a second sealing seat; the second piston needle valve has the same structure as the first piston needle valve, and is in clearance fit with the second needle valve body accommodating cavity, the head of the second piston needle valve is in sealing fit with the second sealing seat, and when the second piston needle valve and the second sealing seat are in sealing fit, a second sealing intersection line is formed by the head of the second piston needle valve and the second sealing seat, and the head of the second needle valve body is provided with spray holes. In one embodiment of th