CN108397330B - Device and method for measuring high-pressure leakage of oil nozzle matching part - Google Patents
Device and method for measuring high-pressure leakage of oil nozzle matching part Download PDFInfo
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- CN108397330B CN108397330B CN201810081973.0A CN201810081973A CN108397330B CN 108397330 B CN108397330 B CN 108397330B CN 201810081973 A CN201810081973 A CN 201810081973A CN 108397330 B CN108397330 B CN 108397330B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 97
- 238000012360 testing method Methods 0.000 claims abstract description 53
- 239000000446 fuel Substances 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 257
- 230000006835 compression Effects 0.000 claims description 23
- 238000007906 compression Methods 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 15
- 238000009863 impact test Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000003116 impacting effect Effects 0.000 claims description 5
- 239000000295 fuel oil Substances 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims 1
- 238000000889 atomisation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
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Abstract
本发明涉及一种测量喷油嘴偶件高压泄漏的装置和方法，其特征是：包括试验油道、第一流量计、第二流量计、第一连接管道、第二连接管道和油箱；喷油嘴偶件放置在喷油嘴紧固座上，由压紧装置对喷油嘴偶件以设定的压紧力进行压紧，形成第一密封面和第二密封面，第一密封面位于喷油嘴偶件进油口的外侧，第二密封面位于喷油嘴偶件进油口的内侧；第一连接管道上安装第一流量计以测量第一密封面的泄漏量，第二连接管道上安装了第二流量计以测量第二密封面的泄漏量。通过对比分析泄漏量和回油量，可以更好的评价密封性能。本发明可以单独对喷油嘴偶件的密封性进行测试，使得到的试验结果更加准确有效。
The invention relates to a device and method for measuring high-pressure leakage of fuel injection nozzles, which is characterized by comprising a test oil passage, a first flowmeter, a second flowmeter, a first connecting pipeline, a second connecting pipeline and an oil tank; The nozzle coupler is placed on the nozzle fastening seat, and the nozzle coupler is pressed by the pressing device with the set pressing force to form the first sealing surface and the second sealing surface. The first sealing surface The second sealing surface is located on the inside of the oil inlet of the fuel injection nozzle pair; the first flow meter is installed on the first connecting pipe to measure the leakage of the first sealing surface, the second A second flow meter is installed on the connecting pipe to measure the leakage of the second sealing surface. By comparing and analyzing the leakage and oil return, the sealing performance can be better evaluated. The invention can test the tightness of the fuel injection nozzle pair separately, so that the obtained test results are more accurate and effective.
Description
Technical Field
The invention relates to a device and a method for measuring high-pressure leakage of an oil nozzle matching part, and belongs to the technical field of automobile diesel engines.
Background
With the continuous development of the combustion technology of the engine, the requirement on the atomization effect of the fuel oil sprayed into the cylinder is higher and higher. Increasing the injection pressure of a fuel system is more widely used in higher level fuel systems as a means for effectively improving the atomization effect of the fuel. In addition, high power density engines require more fuel to be injected over a period of time, and increasing fuel system injection pressure is one of the important means to meet this requirement. Companies such as BOSCH and DENSO abroad have introduced high-pressure common rail systems with injection pressure of more than 200MPa to meet the requirement of engines on fuel atomization effect.
The injection pressure of fuel systems is increasing and the requirements on fuel injectors are also increasing. On the one hand, the sealing surface of the oil nozzle bears more high-pressure leakage risks; on the other hand, higher and higher pressures are also a severe challenge for the structural strength of the injection nozzle.
Related tests performed on the fuel injector assembly fail to effectively verify the high pressure seal condition of the fuel injector nozzle. In addition, the highest pressure that can be born by the existing fuel injector assembly also determines the test pressure of the fuel injection nozzle, and the fuel injection nozzle cannot be subjected to sealing test and structural strength examination under higher pressure (more than 200 MPa).
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the device and the method for measuring the high-pressure leakage of the oil nozzle matching part, which can independently test the sealing performance of the oil nozzle matching part and enable the obtained test result to be more accurate and effective.
According to the technical scheme provided by the invention, the device for measuring the high-pressure leakage of the oil nozzle matching part is characterized in that: the device comprises a pressing device, a test oil passage, a first flowmeter, a second flowmeter, a first connecting pipeline, a second connecting pipeline and an oil tank, wherein the pressing device comprises a pressing block, a piston and a spring; the oil nozzle matching part is placed on the oil nozzle fastening seat, the oil nozzle matching part is compressed by a compressing device with a set compressing force, a first sealing surface and a second sealing surface are formed between the compressing block and the oil nozzle matching part, the first sealing surface is positioned on the outer side of an oil inlet of the oil nozzle matching part, and the second sealing surface is positioned on the inner side of the oil inlet of the oil nozzle matching part; the oil nozzle matching part comprises a compression block, a piston, an oil nozzle matching part and a nozzle, wherein the compression block is provided with a concave cavity, the piston is arranged in the concave cavity, a high-pressure sealing cavity is formed between the piston and the compression block, one end with a large diameter of the piston is positioned at the outlet end of the concave cavity and is in contact with the small-diameter cylindrical end surface of a needle valve of the oil nozzle matching part, and a spring is arranged between one; a rubber sealing ring is arranged between the outlet end of the concave cavity of the pressing block and the oil nozzle matching part, and divides an inner cavity formed among the pressing block, the piston, the oil nozzle matching part and the needle valve into an oil return cavity and an oil drainage cavity, wherein the oil drainage cavity is close to one side of the second sealing surface;
a test oil duct and an oil drainage pipeline are arranged on the compression block, the inlet of the test oil duct is connected with a high-pressure fuel oil outlet, and the outlet of the test oil duct is connected with an oil inlet of the oil nozzle matching part; an oil inlet of the first connecting pipeline is communicated with an outlet of a first sealing surface of the oil nozzle matching part, and an oil inlet of the second connecting pipeline is connected with an outlet of the oil drainage pipeline; the oil outlet of the first connecting pipeline and the oil outlet of the second connecting pipeline are connected into the oil tank through oil return pipelines, the first connecting pipeline is provided with a first flowmeter, and the second connecting pipeline is provided with a second flowmeter.
Furthermore, a static oil return pipeline is arranged on the compression block, an inlet of the static oil return pipeline is communicated with an oil return cavity of the oil nozzle matching part, an outlet of the static oil return pipeline is communicated with an oil inlet of a third connecting pipeline, an oil outlet of the third connecting pipeline is connected into an oil tank through the oil return pipeline, and a third flowmeter is arranged on the third connecting pipeline.
Furthermore, a first oil valve is arranged on the first connecting pipeline, and a second oil valve is arranged on the second connecting pipeline.
Furthermore, the diameter of the middle section of the pressing block is larger, and a step is formed between the middle section and the small-diameter section.
Furthermore, the oil spray nozzle fastening seat is divided into an upper section and a lower section according to different inner diameter sizes, a step is formed between the upper section and the lower section, and the oil spray nozzle matching part is placed in the oil spray nozzle fastening seat and forms a low-pressure sealing surface with the step.
Furthermore, a groove is arranged on the inner side of one end, away from the step, of the oil spray nozzle fastening seat, and a lateral hole is arranged to communicate the groove with the outer side of the fastening seat; and a first sealing surface and a second sealing surface formed by the pressing block and the oil nozzle matching part are positioned within the range of the inner side groove of the oil nozzle fastening seat.
Furthermore, the outer peripheral side face of the compression block and the inner peripheral side face of the oil spray nozzle fastening seat form a guide face, the compression block axially moves along the guide face in an inner cavity of the oil spray nozzle fastening seat, and the guide face is a low-pressure sealing face.
Furthermore, a sealing ring groove is formed at the position, close to the concave cavity, of the outlet end of the concave cavity of the pressing block, and the rubber sealing ring is arranged in the sealing ring groove.
The method for measuring the high-pressure leakage of the oil nozzle matching part adopts the measuring device to measure, and is characterized by comprising the following steps of:
a. the oil nozzle matching part is separated from the oil injector assembly;
b. loading the oil nozzle matching part into a measuring device;
c. assembling a test device provided with an oil nozzle matching part on a static pressure test bed, accessing high-pressure oil of 200-250 MPa from a test oil duct, and keeping the accessed high-pressure oil according to the required time;
d. after 30-900 seconds of pressure maintaining time, the first flow meter measures the leakage amount of the oil nozzle matching part passing through the first sealing surface, the second flow meter measures the leakage amount of the oil nozzle matching part passing through the second sealing surface, and the sealing performance of the sealing end surface of the oil nozzle matching part is checked;
e. assembling a testing device to a high-low pressure impact test bed, connecting test oil through a test oil duct, respectively setting a high pressure value and a low pressure value of the test oil, wherein the range of the high pressure value is 200-300 MPa, the range of the low pressure value is 5-50 MPa, repeatedly impacting an oil nozzle matching part at the frequency of 1-20 Hz, measuring the oil drainage quantity at a first sealing surface of the repeatedly impacted oil nozzle matching part through a first flowmeter, measuring the leakage quantity at the oil drainage position at a second sealing surface of the repeatedly impacted oil nozzle matching part through a second flowmeter, and checking the internal structural strength and the sealing property of the oil nozzle matching part through the method.
Further, in the step c, the first oil valve and the second oil valve are in an open state; and d, the first oil valve and the second oil valve are in a closed state.
Compared with an oil sprayer assembly, the measuring device provided by the invention has a simple structure and only has one high-pressure sealing surface, so that a higher pressure source (300 MPa) can be set. According to the test device and the test method provided by the invention, the leakage condition of the sealing end face of the oil nozzle matching part can be detected under the conditions of different sealing and pressing forces.
Drawings
Fig. 1 is a schematic structural diagram of the device for measuring high-pressure leakage of the fuel injection nozzle matching part.
Description of reference numerals: 1-an oil nozzle matching part, 21-a first flowmeter, 22-a second flowmeter, 23-a third flowmeter, 4 a-a first sealing surface, 4 b-a second sealing surface, 51-a first connecting pipeline, 52-a second connecting pipeline, 53-a third connecting pipeline, 6-an oil tank, 7-an oil return pipeline, 8-a test oil channel, 9-a compression device, 10-a static oil return pipeline, 11-an oil discharge pipeline, 12-a rubber sealing ring, 13-an oil return cavity, 14-an oil discharge cavity and 15-a high-pressure sealing cavity.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the device for measuring high-pressure leakage of an oil nozzle matching part of the invention comprises a test oil passage 8, a first flowmeter 21, a second flowmeter 22, a third flowmeter 23, a first connecting pipeline 51, a second connecting pipeline 52, a third connecting pipeline 53 and an oil tank 6; the oil nozzle matching part 1 is placed on an oil nozzle fastening seat, a pressing device 9 consisting of a pressing block, a piston, a spring and a tightening bolt presses the oil nozzle matching part with a set pressing force to form a first sealing surface 4a and a second sealing surface 4b, the first sealing surface 4a is positioned on the outer side of an oil inlet of the oil nozzle matching part 1, and the second sealing surface 4b is positioned on the inner side of the oil inlet of the oil nozzle matching part 1; the compression block is provided with a concave cavity, the piston is arranged in the concave cavity, a high-pressure sealing cavity 15 is formed between the piston and the compression block, one end with the large diameter of the piston is positioned at the outlet end of the concave cavity and is in contact with the small-diameter cylindrical end surface of the needle valve of the oil nozzle matching part 1, and a spring is arranged between one end with the small diameter of the piston and the compression block; a sealing ring groove is formed at the position, close to the cavity, of the outlet end of the cavity of the pressing block, a rubber sealing ring 12 is arranged in the sealing ring groove, the rubber sealing ring 12 divides an inner cavity formed among the pressing block, the piston, the oil nozzle matching part 1 and the needle valve into an oil return cavity 13 and an oil drain cavity 14, and the oil drain cavity 14 is close to one side of the second sealing surface 4 b; the oil injection nozzle matching part comprises a compression block, a high-pressure fuel oil outlet; an oil inlet of the first connecting pipeline 51 is communicated with an outlet of a first sealing surface 4a of the oil nozzle matching part 1 to measure leakage of the first sealing surface 4a, an oil inlet of the second connecting pipeline 52 is connected with an outlet of the oil drainage pipeline 11 to measure leakage of a second sealing surface 4b, and an oil inlet of the third connecting pipeline 53 is communicated with an outlet of the static oil return pipeline 10 of the compression block to measure the static oil return quantity; an oil outlet of the first connecting pipeline 51, an oil outlet of the second connecting pipeline 52 and an oil outlet of the third connecting pipeline 53 are all connected to the oil tank 6 through an oil return pipeline 7, a first flow meter 21 is arranged on the first connecting pipeline 51, a second flow meter 22 is arranged on the second connecting pipeline 52, and a third flow meter 23 is arranged on the third connecting pipeline 53.
The middle section of the pressing block is larger in diameter and forms a step with the small-diameter section; and a pressing force F which is adjustable in size (0-80000N) and is downward parallel to the axial direction is arranged on the step far away from the cavity of the pressing block.
The oil spray nozzle fastening seat is divided into an upper section and a lower section according to different inner diameter sizes, a step is formed between the upper section and the lower section, and the oil spray nozzle matching part is placed in the oil spray nozzle fastening seat and forms a low-pressure sealing surface with the step. The inner side of one end, far away from the step, of the oil spray nozzle fastening seat is provided with a groove, and a lateral hole is formed in the oil spray nozzle fastening seat and is communicated with the outer side of the groove and the fastening seat. And a first sealing surface 4a and a second sealing surface 4b formed by the pressing block and the oil nozzle matching part 1 are arranged in the range of an inner side groove of the oil nozzle fastening seat.
The end face of one end of the cavity outlet of the compression block is processed according to the specification of the sealing end face of the oil nozzle matching part 1; the outer peripheral side face of the compression block and the inner peripheral side face of the oil spray nozzle fastening seat form a guide face, the compression block can axially move along the guide face in an inner cavity of the oil spray nozzle fastening seat, and the guide face is a low-pressure sealing face. The low-pressure sealing surface is a sealing surface which does not leak within 3 bar.
Further, a first oil valve is provided in the first connection pipe 51, and a second oil valve is provided in the second connection pipe 52.
The invention relates to a method for measuring high-pressure leakage of an oil nozzle matching part, which comprises the following steps:
a. the oil nozzle matching part 1 is separated from the oil injector assembly;
b. the oil nozzle matching part 1 is arranged in the testing device;
c. assembling a test device provided with an oil nozzle matching part on a static pressure test bed, accessing high-pressure oil of 200-250 MPa from a test oil duct 8, and keeping the accessed high-pressure oil according to the required time; keeping the first oil valve and the second oil valve in an opening state;
d. after 30-900 seconds of pressure maintaining time, closing the first oil valve and the second oil valve, measuring the leakage quantity of the oil nozzle matching part passing through the first sealing surface 4a through the first flowmeter 21, measuring the leakage quantity of the oil nozzle matching part passing through the second sealing surface 4b through the second flowmeter 22, measuring the static oil return quantity through the third flowmeter 23, and checking the sealing performance of the sealing end surface of the oil nozzle matching part 1;
e. assembling a test device on a high-low pressure impact test bed, connecting test oil through a test oil duct 8, respectively setting a high pressure value and a low pressure value of the test oil, wherein the range of the high pressure value is 200-300 MPa, the range of the low pressure value is 5-50 MPa, repeatedly impacting the oil nozzle matching part 1 at the frequency of 1-20 Hz, measuring the oil drainage quantity at a first sealing surface 4a of the repeatedly impacted oil nozzle matching part 1 through a first flowmeter 21, measuring the leakage quantity at the oil drainage position at a second sealing surface 4b of the repeatedly impacted oil nozzle matching part 1 through a second flowmeter 22, and measuring the static oil return quantity of the repeatedly impacted oil nozzle matching part 1 through a third flowmeter 23; and the internal structural strength and the sealing performance of the oil nozzle matching part 1 are examined through the test.
The test apparatus according to the present invention separately designs the first connection pipe 51 and the second connection pipe 52 and is separated from the third connection pipe 53 (i.e., the oil return passage). The first flowmeter 21 is attached to the first connection pipe 51, the second flowmeter 22 is attached to the second connection pipe 52, and the third flowmeter 23 is attached to the third connection pipe 53. The first flowmeter 21 can measure the leakage amount of the first sealing surface 4a alone, the second flowmeter 22 can measure the leakage amount of the second sealing surface 4b alone, and the third flowmeter 23 can measure the oil return amount of the injector partner 1 alone. The leakage conditions of the first sealing surface 4a and the second sealing surface 4b under different pressing forces can be tested by setting different pressing forces F, and the sealing performance can be better evaluated by comparing and analyzing the leakage amount and the oil return amount. The testing device disclosed by the invention is simple in structure, and few in high-pressure leakage positions, so that the testing device can bear higher fuel pressure and can be used for testing under the pressure far higher than that of a common rail fuel injector assembly. In the conventional oil injector assembly, the leakage amount and the oil return amount of the oil injection nozzle are gathered in the oil return passage and gathered with the oil returns of other parts, so that the leakage amount of the oil injection nozzle cannot be measured independently.
After the testing device is assembled on a static pressure test bed, a pressure value (200-300 MPa, which is far higher than the pressure which can be borne by the existing fuel injector assembly) is set. High-pressure fuel enters the fuel injection nozzle matching part 1 from the test oil passage 8, an oil return part is branched from the third connecting pipeline 53, a leakage part flows out from the first connecting pipeline 51 and the second connecting pipeline 52 respectively, high pressure is kept for a certain time, the pressure drop of the system is measured, the leakage amount of the fuel is measured, and finally the sealing performance of the fuel injection nozzle matching part under the condition of high pressure is obtained.
The testing device is assembled on a high-low pressure impact testing stand, and a high pressure value (the range of the high pressure value is 200-300 MPa), a low pressure value (the range of the low pressure value is 5-50 MPa) and a high-low pressure change frequency (1-20 Hz) are set according to actual needs. And (4) carrying out an impact test on the test device, and measuring the leakage amount of the oil nozzle matching part through long-time impact. After the impact test is completed, the oil nozzle matching part is detached from the test device, and the structural strength of the oil nozzle matching part can be checked by checking the damaged condition of the internal structure of the oil nozzle matching part.
Compared with an oil sprayer assembly, the testing device provided by the invention has the advantages that the structure is simple, the high-pressure sealing surfaces are fewer, so that the testing device can bear higher pressure than the oil sprayer assembly, and the sealing performance and the structural strength of an oil nozzle matching part can be measured under higher pressure.
Claims (10)
1. The utility model provides a measure device that fuel sprayer mating parts high pressure leaked which characterized by: the device comprises a pressing device (9), a test oil passage (8), a first flowmeter (21), a second flowmeter (22), a first connecting pipeline (51), a second connecting pipeline (52) and an oil tank (6), wherein the pressing device (9) comprises a pressing block, a piston and a spring; the oil nozzle matching part (1) is placed on an oil nozzle fastening seat, the oil nozzle matching part is compressed by a compressing device (9) with a set compressing force, a first sealing surface (4 a) and a second sealing surface (4 b) are formed between a compressing block and the oil nozzle matching part, the first sealing surface (4 a) is positioned on the outer side of an oil inlet of the oil nozzle matching part (1), and the second sealing surface (4 b) is positioned on the inner side of the oil inlet of the oil nozzle matching part (1); the oil nozzle matching part comprises a compression block, a piston, a needle valve and an oil nozzle matching part (1), wherein the compression block is provided with a concave cavity, the piston is arranged in the concave cavity, a high-pressure sealing cavity (15) is formed between the piston and the compression block, one end with a large diameter of the piston is positioned at the outlet end of the concave cavity and is in contact with the small-diameter cylindrical end surface of the needle valve of the oil nozzle matching part (1), and a spring is; a rubber sealing ring (12) is arranged between the outlet end of the concave cavity of the pressing block and the oil nozzle matching part (1), the rubber sealing ring (12) divides an inner cavity formed among the pressing block, the piston, the oil nozzle matching part (1) and the needle valve into an oil return cavity (13) and an oil drainage cavity (14), and the oil drainage cavity (14) is close to one side of the second sealing surface (4 b);
a test oil duct (8) and an oil drainage pipeline (11) are arranged on the compression block, the inlet of the test oil duct (8) is connected with a high-pressure fuel oil outlet, and the outlet of the test oil duct (8) is connected with an oil inlet of the oil nozzle matching part (1); an oil inlet of the first connecting pipeline (51) is communicated with an outlet of a first sealing surface (4 a) of the oil nozzle matching part (1), and an oil inlet of the second connecting pipeline (52) is connected with an outlet of the oil drain pipeline (11); the oil outlet of the first connecting pipeline (51) and the oil outlet of the second connecting pipeline (52) are connected into the oil tank (6) through the oil return pipeline (7), the first connecting pipeline (51) is provided with the first flow meter (21), and the second connecting pipeline (52) is provided with the second flow meter (22).
2. The apparatus of claim 1 for measuring high pressure leakage from an injector nozzle assembly, wherein: the oil injection nozzle is characterized in that a static oil return pipeline (10) is arranged on the compression block, an inlet of the static oil return pipeline (10) is communicated with an oil return cavity (13) of the oil injection nozzle matching part (1), an outlet of the static oil return pipeline (10) is communicated with an oil inlet of a third connecting pipeline (53), an oil outlet of the third connecting pipeline (53) is connected into an oil tank (6) through an oil return pipeline (7), and a third flowmeter (23) is arranged on the third connecting pipeline (53).
3. The apparatus for measuring high-pressure leakage of an injector nozzle matching part according to claim 1 or 2, characterized in that: a first oil valve is arranged on the first connecting pipeline (51), and a second oil valve is arranged on the second connecting pipeline (52).
4. The apparatus for measuring high-pressure leakage of an injector nozzle matching part according to claim 1 or 2, characterized in that: the diameter of the middle section of the pressing block is large, and the middle section and the small-diameter section form a step.
5. The apparatus for measuring high-pressure leakage of an injector nozzle matching part according to claim 1 or 2, characterized in that: the oil spray nozzle fastening seat is divided into an upper section and a lower section according to different inner diameter sizes, a step is formed between the upper section and the lower section, and the oil spray nozzle matching part is placed in the oil spray nozzle fastening seat and forms a low-pressure sealing surface with the step.
6. The apparatus of claim 5 for measuring high pressure leakage from an injector nozzle assembly, wherein: the inner side of one end, far away from the step, of the oil spray nozzle fastening seat is provided with a groove, and a lateral hole is formed to communicate the groove with the outer side of the fastening seat; and a first sealing surface (4 a) and a second sealing surface (4 b) formed by the pressing block and the oil nozzle matching part (1) are arranged within the range of an inner side groove of the oil nozzle fastening seat.
7. The apparatus of claim 5 for measuring high pressure leakage from an injector nozzle assembly, wherein: the outer peripheral side face of the compression block and the inner peripheral side face of the oil spray nozzle fastening seat form a guide face, the compression block moves axially along the guide face in an inner cavity of the oil spray nozzle fastening seat, and the guide face is a low-pressure sealing face.
8. The apparatus of claim 5 for measuring high pressure leakage from an injector nozzle assembly, wherein: a sealing ring groove is formed at the position, close to the concave cavity, of the outlet end of the concave cavity of the pressing block, and a rubber sealing ring (12) is arranged in the sealing ring groove.
9. A method for measuring high pressure leakage of an injector assembly using the apparatus for measuring high pressure leakage of an injector assembly according to any one of claims 1 to 8, comprising the steps of:
a. the oil nozzle matching part (1) is separated from the oil injector assembly;
b. the oil nozzle matching part (1) is arranged in a device for measuring high-pressure leakage of the oil nozzle matching part;
c. assembling a device for measuring high-pressure leakage of the oil nozzle matching part with the oil nozzle matching part on a static pressure test bed, accessing high-pressure oil of 200-250 MPa from a test oil duct (8), and keeping the accessed high-pressure oil according to required time;
d. after 30-900 seconds of pressure maintaining time, the first flowmeter (21) measures the leakage quantity of the oil nozzle matching part passing through the first sealing surface (4 a), the second flowmeter (22) measures the leakage quantity of the oil nozzle matching part passing through the second sealing surface (4 b), and the sealing performance of the sealing end surface of the oil nozzle matching part (1) is checked;
e. assembling a testing device to a high-low pressure impact test bed, connecting testing oil through a testing oil duct (8), respectively setting a high pressure value and a low pressure value of the testing oil, wherein the range of the high pressure value is 200-300 MPa, the range of the low pressure value is 5-50 MPa, and repeatedly impacting an oil nozzle matching part (1) at the frequency of 1-20 Hz, measuring the oil drainage quantity at a first sealing surface (4 a) of the repeatedly impacting oil nozzle matching part (1) through a first flowmeter (21), measuring the leakage quantity at the oil drainage position at a second sealing surface (4 b) of the repeatedly impacting oil nozzle matching part (1) through a second flowmeter (22), and checking the internal structural strength and the sealing property of the oil nozzle matching part (1).
10. The method of claim 9 for measuring high pressure leakage from an injector nozzle assembly, comprising: in the step c, the first oil valve and the second oil valve are in an opening state; in step d, the first oil valve and the second oil valve are in a closed state, wherein the first oil valve is arranged on a first connecting pipeline (51) of the device for measuring the high-pressure leakage of the oil nozzle matching parts, and the second oil valve is arranged on a second connecting pipeline (52) of the device for measuring the high-pressure leakage of the oil nozzle matching parts.
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| CN109268184B (en) * | 2018-09-07 | 2021-11-30 | 机科发展科技股份有限公司 | Method for measuring opening pressure of needle valve body coupling part |
| CN110500218B (en) * | 2019-08-07 | 2021-07-16 | 中国北方发动机研究所(天津) | Leakage quantity testing device for single pump sealing pair |
| CN112229466A (en) * | 2020-11-04 | 2021-01-15 | 广州市新欧机械有限公司 | Novel volumetric device for testing leakage amount |
| CN112943501B (en) * | 2021-04-28 | 2022-03-08 | 一汽解放汽车有限公司 | Flow testing device and method for oil nozzle matching parts |
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| CN205779404U (en) * | 2016-06-29 | 2016-12-07 | 无锡职业技术学院 | The tiny leakage test of a kind of fuel injector and leak tightness test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0325184D0 (en) * | 2003-10-28 | 2003-12-03 | Dt Assembly & Test Europ Ltd | An automotive fuel injector leakage tester |
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| JP2014152659A (en) * | 2013-02-06 | 2014-08-25 | Denso Corp | Injection characteristic obtaining device, and injection characteristic obtaining method |
| CN105927444A (en) * | 2016-05-23 | 2016-09-07 | 中国第汽车股份有限公司无锡油泵油嘴研究所 | Device and method for measuring high pressure leakage of throttle orifice plate |
| CN106153266A (en) * | 2016-06-29 | 2016-11-23 | 无锡职业技术学院 | The tiny leakage test of a kind of fuel injector and seal tightness test system |
| CN205779404U (en) * | 2016-06-29 | 2016-12-07 | 无锡职业技术学院 | The tiny leakage test of a kind of fuel injector and leak tightness test device |
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