阅读说明：本技术 碳罐通风电磁阀泄漏检测系统及其检测方法 (Carbon tank ventilation electromagnetic valve leakage detection system and detection method thereof ) 是由 满全平 杜佳正 陈孔武 张顺 周敏华 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种碳罐通风电磁阀泄漏检测系统,包括通过管路连接的空气泵和碳罐通风电磁阀,空气泵和所述碳罐通风电磁阀均分别连接着接线盒,空气泵的电源引脚与接线盒的正极电性连接,空气泵的加热引脚、vavle引脚和pump引脚分别与接线盒的负极电性连接,空气泵的pump引脚与接线盒的负极之间还串联有电阻,电阻两端并联有电压表。本发明还提供一种碳罐通风电磁阀泄漏检测系统的检测方法,包括步骤1)预热空气泵；2)测量空气泵自身气密性；3)测量连接待测容器的电压值；4)测量连接碳罐通风电磁阀的电压值；5)判断是否满足气密性。本发明可以快速准确的检测出碳罐通风电磁阀的气密性。(The invention discloses a carbon tank ventilation electromagnetic valve leakage detection system which comprises an air pump and a carbon tank ventilation electromagnetic valve which are connected through a pipeline, wherein the air pump and the carbon tank ventilation electromagnetic valve are respectively connected with a junction box, a power supply pin of the air pump is electrically connected with the anode of the junction box, a heating pin, a vavle pin and a pump pin of the air pump are respectively electrically connected with the cathode of the junction box, a resistor is also connected in series between the pump pin of the air pump and the cathode of the junction box, and two ends of the resistor are connected with a voltmeter in parallel. The invention also provides a detection method of the carbon tank ventilation electromagnetic valve leakage detection system, which comprises the steps of 1) preheating an air pump; 2) measuring the air tightness of the air pump; 3) measuring the voltage value of the container to be measured; 4) measuring a voltage value of a ventilation electromagnetic valve connected with the carbon tank; 5) and judging whether the air tightness is met. The invention can quickly and accurately detect the air tightness of the carbon tank ventilation electromagnetic valve.)

1. The utility model provides a carbon tank ventilation solenoid valve leak detection system, includes air pump (3) and the article to be measured (10) through the tube coupling, its characterized in that: the air pump (3) and the to-be-tested object (10) are respectively connected with the junction box (2), a power supply pin of the air pump (3) is electrically connected with the anode of the junction box (2), a heating pin, a vavle pin and a pump pin of the air pump (3) are respectively electrically connected with the cathode of the junction box (2), a resistor (8) is further connected between the pump pin of the air pump (3) and the cathode of the junction box (2) in series, and two ends of the resistor (8) are connected with a voltmeter (9) in parallel.

2. The canister vent solenoid valve leak detection system of claim 1, wherein: the air pump (3) is also provided with a power switch (4), a heating switch (5), a vavle switch (6) and a pump switch (7) which are respectively used for controlling the power pin, the heating pin, the vavle pin and the pump pin.

3. The canister vent solenoid valve leak detection system of claim 1, wherein: the device is characterized in that the to-be-detected article (10) is a carbon tank ventilation electromagnetic valve or a to-be-detected container, a cavity is arranged inside the to-be-detected container, and an air receiving hole connected with an air pump and a leakage hole used for calibrating the size of the leakage aperture are formed in the outer wall of the cavity.

4. A detection method of a carbon tank ventilation electromagnetic valve leakage detection system based on any one of claims 1 to 3 is characterized by comprising the following steps:

1) a suction power switch (4), a heating switch (5) and a preheated air pump (3);

2) a power switch (4) and a pump switch (7) are pulled in to record the measured value U of the voltmeter₀；

3) The pull-in power switch (4), the vavle switch (6) and the pump switch (7) are connected with a plurality of containers to be tested, the leakage apertures of which are sequentially increased, and a plurality of voltmeter measured values U are recorded₁、U₂...U_n；

4) Connecting a carbon tank ventilation electromagnetic valve, and recording a voltmeter measured value U;

5) comparing the voltmeter measurement U with a plurality of voltmeter measurements U₁、U₂...U_nAnd determining whether the leakage quantity of the carbon tank ventilation electromagnetic valve is qualified or not.

Technical Field

The invention relates to the technical field of valve detection, in particular to a carbon tank ventilation electromagnetic valve leakage detection system and a detection method thereof.

Background

With the upgrade and tightening of national emission regulations, the national six regulations GB18352.6-2016 increase the leakage diagnosis requirement of an evaporation system, and the regulations require monitoring the leakage amount generated by the aperture of 1mm or more or 0.5 mm. The areas such as Beijing, Shandong and the like in 7.1.7.2019 are implemented in advance, and the areas such as Beijing, Shandong and the like are implemented in China in 7.1.2020, which leads most host factories to add parts such as carbon tank ventilation electromagnetic valves, oil tank pressure sensors and the like for leakage diagnosis of the evaporation system.

How to effectively detect the air tightness of the whole vehicle evaporation system at low cost before leaving the factory is a problem faced by each domestic host machine factory. At present, the air tightness detection process of the whole vehicle off-line evaporation system of most of host plants is as follows: and (3) blocking or clamping an atmospheric pipeline of a carbon tank ventilation electromagnetic valve, injecting gas through an oil filling port, monitoring the attenuation speed of the pressure of the whole system, and judging whether the air tightness of the evaporation system is qualified. However, the method cannot detect the air tightness of the carbon tank ventilation electromagnetic valve, and if the leakage amount of the carbon tank ventilation electromagnetic valve is too large, the leakage fault of an evaporation system reported by an after-sales market can be caused, so that the failure rate of the whole vehicle market is increased. In addition, the leakage fault of the evaporation system not only affects the quality and brand image of vehicles, but also is difficult to check leakage points after sale, and the leakage source cannot be effectively locked.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a carbon tank ventilation electromagnetic valve leakage detection system and a detection method thereof, which can quickly and accurately detect the air tightness of an electromagnetic valve.

In order to achieve the purpose, the invention provides a carbon tank ventilation electromagnetic valve leakage detection system, which comprises an air pump and a carbon tank ventilation electromagnetic valve which are connected through a pipeline, and is characterized in that: the air pump and the carbon tank ventilation electromagnetic valve are respectively connected with a junction box, a power supply pin of the air pump is electrically connected with the anode of the junction box, a heating pin, a vavle pin and a pump pin of the air pump are respectively electrically connected with the cathode of the junction box, a resistor is further connected in series between the pump pin of the air pump and the cathode of the junction box, and two ends of the resistor are connected with a voltmeter in parallel.

Furthermore, the air pump is also provided with a power switch, a heating switch, a vavle switch and a pump switch which respectively control the power pin, the heating pin, the vavle pin and the pump pin.

Furthermore, the to-be-detected article is a carbon tank ventilation electromagnetic valve or a to-be-detected container, a cavity is arranged inside the to-be-detected container, and an air receiving hole connected with an air pump and a leakage hole used for calibrating the size of the leakage aperture are formed in the outer wall of the cavity.

The invention also provides a detection method based on the carbon tank ventilation electromagnetic valve leakage detection system, which is characterized by comprising the following steps:

1) attracting a power switch, heating a switch and preheating an air pump.

2) The power switch and the pump switch are closed, and the measured value U of the voltmeter is recorded₀。

3) The pull-in power switch, the vavle switch and the pump switch are connected with a plurality of containers to be tested, the leakage apertures of which are sequentially increased, and a plurality of voltmeter measured values U are recorded₁、U₂...U_n。

4) And connecting a carbon tank ventilation electromagnetic valve, and recording a voltmeter measured value U.

5) Comparing the voltmeter measurement U with a plurality of voltmeter measurements U₁、U₂...U_nAnd determining whether the leakage quantity of the carbon tank ventilation electromagnetic valve is qualified or not.

The invention has the beneficial effects that: the air tightness of the carbon tank ventilation electromagnetic valve can be detected quickly and accurately. According to the method, the resistor of the voltmeter to be tested is connected in series on the pump pin wiring branch of the air pump to measure the voltage value of the carbon tank ventilation electromagnetic valve during leakage, and whether the leakage quantity of the carbon tank ventilation electromagnetic valve is qualified or not is obtained by comparing the voltage values of the carbon tank ventilation electromagnetic valve and a plurality of containers to be tested with different leakage apertures.

Drawings

FIG. 1 is a schematic structural diagram of a canister vent solenoid leak detection system.

The components in the figures are numbered as follows: the device comprises a voltage-stabilized power supply 1, a junction box 2, an air pump 3, a power switch 4, a heating switch 5, a vavle switch 6, a pump switch 7, a resistor 8, a voltmeter 9 and a to-be-detected product 10.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings, which are included to provide a more clear understanding of the invention, but are not intended to limit the invention.

As shown in fig. 1, a carbon tank ventilation electromagnetic valve leakage detection system comprises an air pump 3 and a to-be-detected article 10 which are connected through a pipeline, the air pump 3 and the to-be-detected article 10 are respectively connected with a junction box 2, the junction box 2 is connected with a voltage-stabilized power supply 1, a power supply pin of the air pump 3 is electrically connected with a positive electrode of the junction box, a heating pin, a vavle pin and a pump pin of the air pump 3 are respectively electrically connected with a negative electrode of the junction box, a resistor 8 is further connected in series between the pump pin of the air pump 3 and the negative electrode of the junction box 2, and two ends of the resistor 8 are.

In the above technical solution, the air pump 3 is further provided with a power switch 4, a heating switch 5, a vavle switch 6 and a pump switch 7 which respectively control the power pin, the heating pin, the vavle pin and the pump pin.

In the above technical scheme, the object to be measured 10 is a carbon tank ventilation electromagnetic valve or a container to be measured, a cavity is arranged inside the container to be measured, and an air receiving hole connected with an air pump and a leakage hole for calibrating the size of the leakage aperture are arranged on the outer wall of the cavity.

The invention also provides a detection method based on the carbon tank ventilation electromagnetic valve leakage detection system, which is characterized by comprising the following steps:

1. a suction power switch 4, a heating switch 5 and a preheating air pump 3.

2. The power switch 4 and the pump switch 7 are closed, and the measured value U of the voltmeter is recorded₀At this time, the air pump 3 does not supply air to the object 10 to be measured, and the voltage value U is set₀Is only characterized as the voltage value when the air pump 3 leaks, and the voltage value U is expressed₀And comparing the standard value with a qualified standard value of the air pump, judging whether the standard value meets the requirement of air tightness, and if so, further testing.

3. The suction power switch 4, the vavle switch 6 and the pump switch 7 are connected with the leakage aperture in sequenceIncreasing a plurality of containers to be tested, and recording a plurality of voltmeter measured values U₁、U₂...U_n. At the moment, the air pump 3 supplies air to the containers to be detected with different leakage apertures respectively, the air pump does not leak, and the voltage value changes correspondingly along with the change of the leakage apertures.

4. And (5) connecting a carbon tank electromagnetic valve without a leakage hole, and recording a voltmeter measured value U.

5. Comparing the voltmeter measurement U with a plurality of voltmeter measurements U₁、U₂...U_nAccording to the value of U at U₁、U₂...U_nThe position in (1) determines the range in which the leakage hole of the canister vent solenoid valve is located, and thus determines whether the amount of leakage is acceptable. Therefore, whether the leakage pore size of the carbon tank ventilation electromagnetic valve meets the air tightness requirement can be judged only by determining the range of the leakage pore size of the carbon tank ventilation electromagnetic valve.

According to the method, the resistor of the voltmeter to be tested is connected in series on the pump pin wiring branch of the air pump to measure the voltage value of the carbon tank ventilation electromagnetic valve during leakage, and whether the leakage rate of the carbon tank ventilation electromagnetic valve is qualified or not is obtained by comparing the voltage values of the carbon tank ventilation electromagnetic valve and the container to be tested, so that the air tightness of the carbon tank ventilation electromagnetic valve can be rapidly and accurately detected.