A vehicle lamp air tightness detection device and method

Abstract

The present invention provides a method and device for detecting the air tightness of a headlight. The method for detecting the air tightness of a headlight comprises: fixing the headlight on a workbench, connecting a high-pressure gas delivery nozzle to a through hole of the headlight, filling nitrogen into the headlight, and blocking other openings of the headlight; monitoring the air pressure inside the headlight, and when the air pressure reaches the target air pressure, the delivery nozzle is separated from the through hole of the headlight, blocking the through hole of the headlight; monitoring the air pressure inside the headlight, and when the air pressure reaches the detection air pressure, detecting the rate of decrease of the air pressure within the test time. The above technical solution can effectively detect the air tightness of the headlight, and can further dehumidify the headlight, without the need for other hardware devices, thereby reducing the detection and production costs.

Description

Technical Field

[0001] The present invention relates to the field of vehicle lamps, and in particular to a device and method for detecting air tightness of vehicle lamps. Background Art

[0002] In the prior art, the air tightness test of the headlights is an important test step. At the same time, the fogging phenomenon of headlights caused by temperature difference has always been a difficult problem that troubles automobile end users. For this reason, various headlight dehumidification solutions have emerged, such as designing an air circulation ventilation system for headlights and installing fans; equipping headlights with dehumidification systems, including sensor detection modules, semiconductor condensation modules and drainage modules, etc.; but these physical and electromechanical systems have complex structures and limited dehumidification effects. In addition, the industrial development of semiconductor condensation modules for automobile headlights requires systematic development, which is costly and requires time to be applied in batches to the field of headlights.

[0003] Therefore, the air tightness detection and dehumidification steps of the vehicle lamp are necessary processing steps before the vehicle lamp is put into use. In the prior art, the two steps need to be performed separately, which not only wastes time, but also has high production costs. Summary of the invention

[0004] In order to overcome the above technical defects, the object of the present invention is to provide a method and device for detecting air tightness of vehicle lamps.

[0005] Specifically, the vehicle lamp air tightness detection method includes:

[0006] Fix the car light on the workbench, connect the air delivery nozzle of high-pressure gas to the through hole of the car light, fill nitrogen into the car light, and block other openings of the car light; monitor the internal air pressure of the car light, and when the internal air pressure reaches the target air pressure, separate the air delivery nozzle from the through hole of the car light and block the through hole of the car light; monitor the internal air pressure, and when the internal air pressure reaches the detection air pressure, detect the reduction rate of the internal air pressure within the test time.

[0007] Preferably, after detecting the rate of decrease of the internal air pressure within the test time, the lamp through hole and the opening are opened, and at the same time, the lamp through hole and the opening are blocked with a nitrogen-making carbon molecular sieve bag.

[0008] Preferably, the vehicle lamp is fixed on a workbench, a high-pressure gas delivery nozzle is connected to a through hole of the vehicle lamp, nitrogen is filled into the vehicle lamp, and after the first time of filling, other openings of the vehicle lamp are blocked.

[0009] Preferably, the headlight is fixed to a workbench, and the lens of the headlight is placed upward.

[0010] In another aspect of the present invention, there is provided a device for testing air tightness of a vehicle lamp, comprising a workbench, an air tightness testing platform and a high-pressure gas source; the workbench comprises a clamping unit and a positioning unit, the clamping unit fixes the vehicle lamp to the workbench; the high-pressure gas source is used to provide high-pressure nitrogen, comprising a high-pressure gas manufacturing unit and a high-pressure gas delivery unit, the high-pressure gas manufacturing unit manufactures high-pressure nitrogen, which is connected to the vehicle lamp through-hole through the delivery nozzle in the high-pressure gas delivery unit, and nitrogen is filled into the vehicle lamp, while the positioning unit blocks other openings of the vehicle lamp; the air tightness testing platform monitors the internal air pressure of the vehicle lamp, and when the internal air pressure reaches the target air pressure, the delivery nozzle is separated from the vehicle lamp through-hole, and the positioning unit blocks the vehicle lamp through-hole; the air tightness testing platform continuously monitors the internal air pressure, and when the internal air pressure reaches the monitoring air pressure, the rate of decrease of the internal air pressure is detected within the test time.

[0011] Preferably, the air tightness test bench detects the rate of decrease of the air pressure during the test time; the positioning unit releases the headlight through hole and the opening, and simultaneously uses a nitrogen-making carbon molecular sieve bag to block the headlight through hole and the opening.

[0012] Preferably, the high-pressure gas manufacturing unit manufactures high-pressure nitrogen, which is connected to the through hole of the headlight through the gas delivery nozzle in the high-pressure gas delivery unit, and the nitrogen is filled into the headlight. After the first time of filling, the positioning unit blocks other openings of the headlight.

[0013] Preferably, the clamping unit fixes the headlight to the workbench, and when fixed, the lens of the headlight is placed upward.

[0014] The vehicle lamp air tightness detection method and device of the present invention can not only effectively detect the air tightness of the vehicle lamp, but also further dehumidify the vehicle lamp without the need for other hardware devices, eliminating the air circulation ventilation system in the prior art, such as a fan; nor is it necessary to equip the vehicle lamp with a dehumidification system, including a sensor detection module, a semiconductor condensation module, and a drainage module, etc. This not only saves the detection steps of the vehicle lamp, but also further saves the hardware devices, reducing the detection and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flow chart of a method for detecting air tightness of a vehicle lamp in accordance with an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the change of air pressure inside the headlight measured in the detection method;

[0017] Figure 3 is another flow chart of a method for detecting air tightness of a vehicle lamp in accordance with an embodiment of the present invention;

[0018] t1: start time of test; t2: end time of test;

[0019] p1: air pressure at the start of the test; p2: air pressure after the test ends. DETAILED DESCRIPTION

[0020] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0022] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0024] Figure 1 FIG. 1 is a flow chart of a method for detecting air tightness of a vehicle lamp in accordance with an embodiment of the present invention. Figure 1 It can be seen that the air tightness detection method of the vehicle lamp in the present invention includes:

[0025] S1: Fix the headlight on the workbench, connect the high-pressure gas delivery nozzle to the headlight through hole, fill nitrogen into the headlight, and block other openings of the headlight.

[0026] In the prior art, when testing the air tightness of a headlight, for cost and operability considerations, high-pressure air is usually filled into the headlight for subsequent testing. In the present invention, nitrogen is filled into the headlight, which can, on the one hand, discharge the air containing moisture inside the headlight to ensure that the inside of the headlight is kept dry and avoid water mist inside the headlight, which affects subsequent use; on the other hand, filling with inert gas eliminates the need for a separate air circulation ventilation system inside the headlight, which can effectively reduce the hardware requirements. More preferably, in order to more fully discharge the gas, after nitrogen is filled into the headlight, nitrogen is continuously introduced for a period of time before blocking the other openings of the headlight.

[0027] S2: monitoring the internal air pressure of the vehicle lamp, and when the air pressure reaches the target air pressure, the air delivery nozzle is separated from the vehicle lamp through hole to block the vehicle lamp through hole.

[0028] The target air pressure can be preset. The specific value of the target air pressure is not specifically limited in the present invention. The target air pressure only needs to be greater than the atmospheric pressure so that the interior of the vehicle lamp is in a high pressure state.

[0029] S3: monitoring the internal air pressure, and when the internal air pressure reaches the detection air pressure, detecting the decreasing rate of the internal air pressure within the test time.

[0030] refer to Figure 2 , which is a schematic diagram of the change of the air pressure in the headlight over time in this embodiment. Since the filling of high-pressure gas will cause the gas in the headlight to flow, the temperature inside the headlight may also rise temporarily, which will also cause the air pressure inside the headlight to be unstable, so it is necessary to set a steady-state time, and then measure the rate of decrease of the air pressure when the air pressure in the headlight is in a stable state. The reduction rate is characterized by the rate of decrease of the air pressure during the test time, specifically (P1-P2) / (t2-t1), where (t2-t1) is the test time, p1 is the test pressure, and p2 is the air pressure value in the headlight after the test time. When the measured reduction rate is less than a threshold value, it can be determined that the air tightness of the headlight meets the requirements. The specific threshold value varies according to the specific type of the headlight. Therefore, the present invention is not specifically limited here, and it can be set according to actual needs.

[0031] Figure 3 Another flow chart of the method for detecting air tightness of a vehicle lamp in accordance with an embodiment of the present invention is shown. When the rate of decrease of the air pressure is detected within the test time, the vehicle lamp through hole and the opening are opened, and the vehicle lamp through hole and the opening are blocked with a nitrogen-generating carbon molecular sieve bag.

[0032] In the prior art, a vent film or an O-ring is usually used to seal all through holes of a headlight. The vent film and the O-ring cannot effectively promote the gas circulation in the headlight, and when a temperature difference occurs, fogging is easily generated in the headlight. In the present invention, nitrogen is firstly filled into the headlight to squeeze out the air in the headlight, and a nitrogen-generating carbon molecular sieve bag is used to block the through holes and openings of the headlight, so that the inside of the headlight is always filled with dry inert gas, which can effectively avoid the fogging of the headlight.

[0033] The nitrogen production principle of the nitrogen-producing carbon molecular sieve is: utilizing the transport adsorption characteristics of the carbon molecular sieve, that is, the equilibrium adsorption amount of oxygen and nitrogen by the carbon molecular sieve is similar, but because the molecular size of oxygen (2.8×3.9) is smaller than the molecular size of nitrogen (3.0×4.1), the diffusion rate of oxygen in the carbon molecular sieve is fast, so oxygen is adsorbed and nitrogen flows out as a product. After a period of time, stop passing air, evacuate the bed to regenerate the carbon molecular sieve. This method is usually carried out under the conditions of 0.1-0.5×106Pa in the adsorption stage and normal pressure or vacuum and normal temperature in the desorption stage, which is easy to implement in industry.

[0034] Therefore, even if the nitrogen-producing carbon molecular sieve is an existing technology, in the present invention, the fogging phenomenon of the headlights can be effectively avoided by adding nitrogen into the headlights.

[0035] The air tightness detection method of the vehicle lamp in the present invention can not only effectively detect the air tightness of the vehicle lamp, but also further dehumidify the vehicle lamp without the need for other hardware devices, eliminating the air circulation ventilation system in the prior art, such as a fan; and there is no need to equip the vehicle lamp with a dehumidification system, including a sensor detection module, a semiconductor condensation module, and a drainage module, etc. This not only saves the detection steps of the vehicle lamp, but also further saves the hardware devices, reducing the detection and production costs.

[0036] In addition, the present invention also provides a vehicle lamp air tightness detection device, the technical features of which are the same as the above-mentioned vehicle lamp air tightness detection method, and the present invention will not be elaborated here.

[0037] In one embodiment consistent with the present invention, the air tightness detection device for a vehicle lamp comprises a workbench, an air tightness detection platform and a high-pressure gas source; the workbench comprises a clamping unit and a positioning unit, and the clamping unit fixes the vehicle lamp to the workbench; the high-pressure gas source is used to provide high-pressure nitrogen, and comprises a high-pressure gas manufacturing unit and a high-pressure gas delivery unit, the high-pressure gas manufacturing unit manufactures high-pressure nitrogen, which is connected to the vehicle lamp through-hole through the delivery gas nozzle in the high-pressure gas delivery unit, and nitrogen is filled into the vehicle lamp, and at the same time, the positioning unit blocks other openings of the vehicle lamp; the air tightness detection platform monitors the internal air pressure of the vehicle lamp, and when the air pressure reaches the target air pressure, the delivery gas nozzle is separated from the vehicle lamp through-hole, and the positioning unit blocks the vehicle lamp through-hole; the air tightness detection platform continuously monitors the internal air pressure of the vehicle lamp, and when the internal air pressure reaches the monitoring air pressure, the rate of decrease of the internal air pressure is detected within the test time.

[0038] The vehicle lamp air tightness detection device integrates the air tightness detection and vehicle lamp dehumidification steps into one device, and performs air tightness detection and vehicle lamp dehumidification at the same time. From the perspective of the detection process, the detection steps of the vehicle lamp are effectively shortened; from the perspective of the performance of the vehicle lamp, the condensation phenomenon of the vehicle lamp can be effectively avoided, which is beneficial to the subsequent use of the vehicle lamp; from the perspective of production, the integration of the device is conducive to reducing the detection and production costs of the vehicle lamp.

[0039] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for detecting air tightness of a vehicle lamp, characterized in that: Fix the headlight on the workbench, connect the high-pressure gas delivery nozzle to the headlight through hole, fill nitrogen into the headlight, and block other openings of the headlight; Monitoring the internal air pressure of the lamp, and when the air pressure reaches a target air pressure, the air delivery nozzle is separated from the lamp through hole to block the lamp through hole, wherein the target air pressure is greater than the atmospheric pressure; After the steady-state time, the air pressure in the headlight is in a stable state, the internal air pressure is monitored, and when the internal air pressure reaches the detection pressure, the decreasing rate of the internal air pressure is detected within the test time; After detecting the rate of decrease of the internal air pressure during the test time, The lamp through hole and the opening are opened, and the lamp through hole and the opening are blocked with a nitrogen-making carbon molecular sieve bag.

2. The vehicle lamp air tightness detection method according to claim 1, characterized in that: Fix the headlight on the workbench, connect the high-pressure gas delivery nozzle to the headlight through hole, fill nitrogen into the headlight, and after the first filling, block the other openings of the headlight.

3. The vehicle lamp air tightness detection method according to claim 2, characterized in that: The headlight is fixed on a workbench, and the lens of the headlight is placed upward.

4. A vehicle lamp air tightness detection device, characterized in that: It includes a tooling table, an airtightness testing table and a high-pressure gas source; the tooling table includes a clamping unit and a positioning unit, and the clamping unit fixes the headlight on the tooling table; The high-pressure gas source is used to provide high-pressure nitrogen, including a high-pressure gas manufacturing unit and a high-pressure gas delivery unit. The high-pressure gas manufacturing unit manufactures high-pressure nitrogen, which is connected to the through hole of the lamp through the delivery nozzle in the high-pressure gas delivery unit to fill the lamp with nitrogen. At the same time, the positioning unit blocks other openings of the lamp. The airtightness testing station monitors the internal air pressure of the vehicle lamp, and when the internal air pressure reaches a target air pressure, the air delivery nozzle is separated from the vehicle lamp through hole, and the positioning unit blocks the vehicle lamp through hole, wherein the target air pressure is greater than the atmospheric pressure; The airtightness testing station continuously monitors the internal air pressure, and when the internal air pressure reaches the monitoring air pressure, detects the rate of decrease of the internal air pressure within the test time; The airtightness testing station detects the rate of decrease of the internal air pressure during the testing time; The positioning unit releases the lamp through hole and the opening, and simultaneously uses a nitrogen-making carbon molecular sieve bag to block the lamp through hole and the opening.

5. The vehicle lamp air tightness detection device according to claim 4, characterized in that: The high-pressure gas manufacturing unit manufactures high-pressure nitrogen, which is connected to the through hole of the car lamp through the gas delivery nozzle in the high-pressure gas delivery unit, and the nitrogen is filled into the car lamp. After the first time of filling, the positioning unit blocks the other openings of the car lamp.

6. The vehicle lamp air tightness detection device according to claim 5, characterized in that: The clamping unit fixes the headlight on the workbench, and when fixed, the lens of the headlight is placed upward.

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