阅读说明：本技术 一种密封测试装置及密封测试方法 (Sealing test device and sealing test method ) 是由 陆国欢 饶鹏 徐天添 黄洪浪 张社民 于 2020-11-10 设计创作，主要内容包括：本发明涉及汽车零部件测试技术领域,具体地指一种密封测试装置及密封测试方法。包括恒温箱和密封测试腔；所述密封测试腔中空且可充填测试介质,密封测试腔一端开口用于安装待测试的密封组件,另一端设置有用于对密封测试腔加压或是泄压的液压结构；所述恒温箱内设置有测试时检测密封测试腔内测试介质泄露情况的监测结构,恒温箱内还设置有用于模拟振动工况的振动输出结构；所述密封测试腔通过振动输出结构悬置于恒温箱内。本发明结构简单,使用方便,能够针对密封组件的实际运行工况进行密封测试实验,得出的结果更准确反映密封组件的真实密封情况,对于密封组件的设计和修改具有重大的指导意义。(The invention relates to the technical field of automobile part testing, in particular to a sealing testing device and a sealing testing method. Comprises a constant temperature box and a sealed test cavity; the sealing test cavity is hollow and can be filled with a test medium, an opening at one end of the sealing test cavity is used for installing a sealing component to be tested, and a hydraulic structure used for pressurizing or decompressing the sealing test cavity is arranged at the other end of the sealing test cavity; a monitoring structure for detecting the leakage condition of a test medium in the sealed test cavity during testing is arranged in the constant temperature box, and a vibration output structure for simulating the vibration working condition is also arranged in the constant temperature box; the sealed test cavity is suspended in the constant temperature box through a vibration output structure. The invention has simple structure and convenient use, can carry out sealing test experiments aiming at the actual operating condition of the sealing assembly, and the obtained result more accurately reflects the real sealing condition of the sealing assembly, thereby having great guiding significance for the design and modification of the sealing assembly.)

1. A seal testing device, characterized by: comprises a constant temperature box (1) and a sealed test cavity (2); the sealing test cavity (2) is hollow and can be filled with a test medium, one end of the sealing test cavity (2) is provided with an opening for installing a sealing component (3) to be tested, and the other end of the sealing test cavity is provided with a hydraulic structure for pressurizing or decompressing the sealing test cavity (2); a monitoring structure for detecting the leakage condition of a test medium in the sealed test cavity (2) during testing is arranged in the constant temperature box (1), and a vibration output structure for simulating the vibration working condition of the sealed test cavity (2) is also arranged in the constant temperature box (1); the sealed test cavity (2) is suspended in the constant temperature box (1) through a vibration output structure.

2. A seal testing apparatus according to claim 1, wherein: the vibration output assembly comprises a plurality of cavity mounts (4); one end of the cavity support (4) is fixed on the inner wall of the constant temperature box (1), the other end of the cavity support is connected to the sealed test cavity (2), and the cavity support (4) is provided with a servo motor (5) for knocking the cavity support (4) to simulate the vibration working condition.

3. A seal testing apparatus according to claim 1, wherein: the hydraulic structure comprises a rubber tube (4) arranged at one end of the sealing test cavity (2) far away from the sealing assembly (3) and a piston (7) capable of moving along the axial direction of the cavity; the piston (7) divides the sealing test cavity (2) into a left independent cavity and a right independent cavity; one end of the rubber tube (6) is communicated with the cavity far away from one side of the sealing component (3), and the other end of the rubber tube is connected with a hydraulic oil pump (8).

4. A seal testing apparatus according to claim 3, wherein: two sides of the piston (7) are provided with return springs (9); one end of the reset spring (9) is fixed at one axial side of the piston (7), and the other end of the reset spring is connected with the side wall of the boss in the sealed test cavity (2).

5. A seal testing device according to claim 3 or 4, wherein: and a medium input device for injecting a test medium into the chamber close to one side of the sealing assembly (3) is further arranged on the sealing test cavity (2).

6. A seal testing apparatus according to claim 5, wherein: the medium input device comprises a medium input pipe (10) arranged on the sealed test cavity (2) in a penetrating mode and a vacuum pump (11) arranged on the medium input pipe (10); one end of the medium input pipe (10) penetrates through the sealing test cavity (2) to be communicated with the cavity close to the sealing assembly (3), and the other end of the medium input pipe is connected with a high-precision flow pump (12).

7. A seal testing apparatus according to claim 1, wherein: the monitoring structure comprises a plurality of fluorescence detection cameras (13) arranged in the incubator (1).

8. A seal testing apparatus according to claim 5, wherein: and a pressure sensor (14) for monitoring the pressure of the chamber and a temperature sensor (15) for testing the temperature are arranged in the chamber close to one side of the sealing assembly (3) in the sealing test chamber (2).

9. A seal testing method using the seal testing apparatus according to claim 1, characterized in that: mounting a sealing assembly to be tested on a sealing test cavity (2), injecting a test medium into the sealing test cavity (2), outputting pulse pressure to the sealing test cavity (2) by using a hydraulic structure after the design pressure is reached, performing vibration simulation output to the sealing test cavity (2) by using a vibration output structure, and recording first leakage amount of the test medium in the sealing test cavity (2) after the design time is reached; and then, installing the standard sealing assembly on the sealing test cavity (2) according to the flow to carry out an experiment, and obtaining a second leakage amount of the test medium corresponding to the standard sealing assembly, wherein the difference value of the first leakage amount and the second leakage amount is an index for judging the sealing standard of the sealing assembly to be tested.

10. A seal testing method according to claim 1, characterized in that: the high-precision flow pump (12) pumps the test medium into the sealed test cavity (2), after the test is completed, the high-precision flow pump (12) pumps out the residual test medium in the sealed test cavity (2), and the high-precision flow pump (12) records the first leakage amount of the whole pipeline and the sealed test cavity (2).

Technical Field

The invention relates to the technical field of automobile part testing, in particular to a sealing testing device and a sealing testing method.

Background

Cooling and lubrication systems for engines include a variety of sealing combinations such as flat gasket seals, bowl plug seals, gasket seals, rubber ring seals, and band seals. The selection and design of these sealing schemes is made with reference to competitive product schemes and industry standards. However, these solutions have different effects in mass production applications due to differences in assembly processes of each main machine factory or component supplier. Therefore, in the design of the sealing scheme, besides the data of reference competitive products and standards, the data also needs to be corrected by combining the production process level of the sealing scheme.

When the sealing scheme is corrected, the sealing scheme needs to be performed according to the performance of the scheme in the actual use of the product, so the durability test of the engine is particularly important. However, the seal design needs to be verified quickly and repeatedly, and the durability test of the whole machine has several important defects.

The cost is high: the whole durable rack runs once, and the test cost is huge, so that the rack resources are generally controlled by a strict plan, and pure cooling lubrication seal leakage verification tests can be hardly carried out;

the cycle length is as follows: because the cost is high, the whole machine bench test always integrates a plurality of investigation items to be carried out together, which is resource saving, but the time for integrating a plurality of investigation items is needed, the verification and correction time of the seal design is easily delayed, and finally, the product is risky due to insufficient verification;

the interference is more: the whole machine test has many investigation items, and some misjudgment conditions can occur, for example, the water temperature of an engine is high, so that the sealing failure of the cylinder gasket is caused, the failure of the cylinder gasket belongs to a damaged part, but the failure of the cylinder gasket is often difficult to explain in analysis because of abnormal water temperature, and even the cylinder gasket is easy to be considered to be failed, so that the cooling water is reduced, and the abnormal water temperature and other problems are caused.

Disclosure of Invention

The present invention is directed to solve the above-mentioned drawbacks of the prior art, and provides a sealing test apparatus and a sealing test method.

The technical scheme of the invention is as follows: a seal testing device, characterized by: comprises a constant temperature box and a sealed test cavity; the sealing test cavity is hollow and can be filled with a test medium, an opening at one end of the sealing test cavity is used for installing a sealing component to be tested, and a hydraulic structure used for pressurizing or decompressing the sealing test cavity is arranged at the other end of the sealing test cavity; a monitoring structure for detecting the leakage condition of a test medium in the sealed test cavity during testing is arranged in the constant temperature box, and a vibration output structure for simulating the vibration working condition is also arranged in the constant temperature box; the sealed test cavity is suspended in the constant temperature box through a vibration output structure.

Further the vibration output assembly comprises a plurality of cavity mounts; one end of the cavity support is fixed on the inner wall of the constant temperature box, the other end of the cavity support is connected to the sealing test cavity, and the servo motor is installed on the cavity support and used for knocking the cavity support to simulate the vibration working condition.

The hydraulic structure further comprises a rubber tube arranged at one end of the sealing test cavity far away from the sealing assembly and a piston capable of moving along the axial direction of the cavity; the piston divides the sealing test cavity into a left independent cavity and a right independent cavity; one end of the rubber tube is communicated with the cavity on one side far away from the sealing assembly, and the other end of the rubber tube is connected with a hydraulic oil pump.

Further, two sides of the piston are provided with return springs; one end of the reset spring is fixed on one axial side of the piston, and the other end of the reset spring is connected with the side wall of the boss in the sealed test cavity.

And a medium input device for injecting a test medium into the chamber close to one side of the sealing assembly is further arranged on the sealing test chamber.

The medium input device further comprises a medium input pipe arranged on the sealed test cavity in a penetrating way and a vacuum pump arranged on the medium input pipe; one end of the medium input pipe penetrates through the sealing test cavity to be communicated with the cavity close to the sealing assembly, and the other end of the medium input pipe is connected with a high-precision flow pump.

Further the monitoring structure includes a plurality of fluorescence detection cameras mounted within the incubator.

And a pressure sensor for monitoring the pressure of the chamber and a temperature sensor for testing the temperature are arranged in the chamber close to one side of the sealing assembly in the sealing test cavity.

A sealing test method using a sealing test device is characterized in that: installing a sealing assembly to be tested on a sealing test cavity, injecting a test medium into the sealing test cavity, outputting pulse pressure to the sealing test cavity by using a hydraulic structure after the design pressure is reached, outputting vibration simulation to the sealing test cavity by using a vibration output structure, and recording a first leakage amount of the test medium in the sealing test cavity after the design time is reached; and then, installing the standard sealing assembly on the sealing test cavity according to the flow to perform an experiment, and obtaining a second leakage amount of the test medium corresponding to the standard sealing assembly, wherein the difference value of the first leakage amount and the second leakage amount is an index for judging the sealing standard of the sealing assembly to be tested.

The method for recording the first leakage quantity of the test medium in the sealed test cavity comprises the following steps: and pumping the test medium into the sealed test cavity by the high-precision flow pump, pumping the residual test medium out of the sealed test cavity by the high-precision flow pump after the test is finished, and recording the first leakage amount of the whole pipeline and the sealed test cavity by the high-precision flow pump.

The leakage amount of the invention is leakage flow.

The invention has the advantages that: 1. the vibration output device and the hydraulic device can simulate various working condition characteristics of the sealing assembly in actual use, so that the sealing test is more practical, the test result is more accurate, and the vibration output device and the hydraulic device have extremely good guiding significance;

2. the leakage amount of the target sealing scheme can be accurately measured according to the specific production level of the device, design parameters of competitive products, industry standards or empirical data are avoided being directly applied, and the device can be adjusted by combining the production level and the detection method;

3. the invention solves the problems of high cost, long period and strong interference existing in the verification only by using a durable rack of the whole machine;

4. the invention simulates the actual running state of the engine, and the output sealing scheme has accurate guiding significance for modifying the direction.

The invention greatly improves the efficiency of the development of the sealing scheme, and can be used for expanding and verifying the sealing scheme, such as exploring the influence of moment, gluing, aperture, sealing material, sealing medium, vibration frequency, medium pressure and the like on the specific sealing scheme, so that the system verification of the influence factors of the sealing scheme is expanded from the verification aiming at a single working condition point, and the invention has great significance for the later-stage sealing design and improvement.

The invention has simple structure and convenient use, can carry out sealing test experiments aiming at the actual operating condition of the sealing assembly, and the obtained result more accurately reflects the real sealing condition of the sealing assembly, thereby having great guiding significance for the design and modification of the sealing assembly.

Drawings

FIG. 1: the invention has a structure schematic diagram;

wherein: 1-a constant temperature box; 2-sealing the test cavity; 3-a sealing assembly; 4, a cavity support; 5, a servo motor; 6-rubber tube; 7-a piston; 8-a hydraulic oil pump; 9-a return spring; 10-medium input pipe; 11-vacuum pump; 12-high precision flow pump; 13-a fluorescence detection camera; 14-a pressure sensor; 15-temperature sensor; 16-hydraulic oil tank.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

Referring to fig. 1, a sealing test device comprises an incubator 1 and a sealing test chamber 2, wherein the incubator 1 is used for keeping the temperature in the whole chamber constant and adjusting the experimental test temperature. The 2-position hollow cavity structures of the sealed test cavity, one end opening of the sealed test cavity 2 is used for installing a sealing component 3 to be tested, and the other end of the sealed test cavity is provided with a hydraulic structure used for pressurizing or decompressing the sealed test cavity 2. The hydraulic structure is used for testing the sealing assembly and testing the type pulse pressure of the sealing test cavity 2, the specific structure is shown in figure 1, the hydraulic structure comprises a rubber pipe 4 arranged at one end of the sealing test cavity 2 far away from the sealing assembly 3 and a piston 7 capable of axially moving along the cavity, the piston 7 divides the sealing test cavity 2 into a left independent cavity and a right independent cavity, one end of the rubber pipe 6 is communicated with the cavity far away from one side of the sealing assembly 3, the other end of the rubber pipe is connected with a hydraulic oil pump 8, the hydraulic oil pump 8 is connected with a hydraulic oil tank 16, the hydraulic oil pump 8 pumps oil in the hydraulic oil tank 16 into the sealing test cavity 2 through the rubber pipe 4 for pressurizing the sealing test cavity 2 and can also pump out the oil in the sealing test cavity 2, the pressure relief device is used for relieving pressure of the sealed test cavity 2, and pulse pressure can be applied to the sealed test cavity 2 by alternately pumping in and pumping out.

The middle of the sealed test cavity 2 of the embodiment is provided with a piston 7, the piston 7 separates the sealed test cavity 2 into two independent cavities, one cavity far away from the sealing component 3 is communicated with the rubber tube 6, the other cavity close to the sealing component 3 can be filled with a test medium, and the sealed test cavity 2 is provided with a medium input device for injecting the test medium into the cavity close to one side of the sealing component 3. As shown in fig. 1, the medium input device includes a medium input tube 10 penetrating the sealed test cavity 2 and a vacuum pump 11 installed on the medium input tube 10, one end of the medium input tube 10 penetrates the sealed test cavity 2 to communicate with a cavity close to the sealing component 3, and the other end is connected with a high-precision flow pump 12. The vacuum pump 11 can vacuumize the chamber on the side of the sealed test chamber 2 close to the sealing assembly, and the high-precision flow pump 12 is used for pumping in or pumping out the test medium in the chamber.

When the test medium in the sealed test chamber 2 leaks, the fluorescence detection camera 13 in the incubator 1 can reflect the leakage condition to the display of the control system. As shown in fig. 1, in the present embodiment, a plurality of fluorescence detection cameras 13 are provided in the oven 1, and are uniformly distributed in the oven 1.

Because the piston 7 can move along the axial direction in the sealed test cavity 2, in order to ensure that the piston 7 can return to the initial position after the test is completed each time, the two sides of the piston 7 are provided with the return springs 9, one end of each return spring 9 is fixed on one side of the piston 7 in the axial direction, and the other end of each return spring is connected with the side wall of the boss in the sealed test cavity 2. The piston 7 is ensured to be able to return by the spring action of the return spring 9.

This embodiment still is provided with the vibration output structure of simulation vibration in thermostated container 1, as shown in fig. 1, vibration output structure includes a plurality of cavity support 4, and 4 one ends of cavity support are fixed in 1 inner wall of thermostated container, the other end is connected in sealed test chamber 2, installs servo motor 5 on the cavity support 4 and is used for knocking 4 simulation vibration operating modes of cavity support.

In order to ensure that the sealing assembly 3 reaches the designed temperature and pressure during testing, the present embodiment is provided with a pressure sensor 14 for monitoring the pressure of the chamber and a temperature sensor 15 for testing the temperature in the chamber near the side of the sealing assembly 3 in the sealing test chamber 2.

The specific test method is as follows:

step 1: assembling a sealing component 3 to be tested on the sealing test cavity 2;

step 2: the sealed test cavity 2 is vacuumized by a vacuum pump 11, and the vacuum degree reaches 0.3 KPa;

and step 3: a high-precision flow pump 12 is used for pumping a test medium (engine oil and cooling liquid) into a cavity of the sealing test cavity 2 close to one side of the sealing assembly 3 to reach the actual working condition pressure P1;

and 4, step 4: starting the constant temperature box 1, and waiting for the temperature of the test medium to reach a target temperature T1, wherein the temperature is measured by the temperature sensor 15;

and 5: after the medium temperature is stable, applying actual working condition pulse pressure P2 to the chamber of the side, away from the sealing assembly 3, of the sealing test cavity 2 through the hydraulic oil pump 8, starting the servo motor 5, and knocking the cavity support 4 at a specific frequency;

step 6: the operation lasts for 100h, and whether the sealing surface of the sealing component 3 has leakage traces or not is monitored through the fluorescent detection camera 13 in the period; if not, the servo motor 5 and the thermostat 1 are manually stopped to operate, and the hydraulic oil pump 8 releases pressure; if yes, the control system automatically stops the operation of the servo motor 5, the thermostat 1 and the hydraulic oil pump 8;

and 7: pumping a test medium (engine oil and cooling liquid) out of the sealed test cavity 2 by using the high-precision flow pump 12, switching a medium source into an air source (air source), repeatedly pumping the air source into and out of the sealed test cavity 2, and cleaning a pipeline for 3 times;

and 8: pumping an air source into the sealed test cavity 2 to reach a test pressure P3, and reading a first leakage Q1 of the sealed test cavity 2 and the rubber tube 6 through the high-precision flow pump 12;

and step 9: pumping out gas, assembling the standard sealing assembly on the sealing test cavity 2, and repeating the steps 2-9 to obtain a second leakage quantity Q0 corresponding to the standard sealing assembly;

step 10: the test was repeated 3 times;

(Q1-Q0) is the leakage amount of the tested sealing scheme, and the deviation of leakage of other joint surfaces and pipelines of the sealing test cavity 2 is eliminated. And judging whether the seal fails according to the result in the step 6, wherein the corresponding leakage amount (Q1-Q0) can be used as a target sealing scheme leakage amount judgment standard.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.