Rapid leak detection device for air conditioner detection

Abstract

The utility model discloses a rapid leak detection device used for air conditioner detection, comprising a gas tank, an air outlet of the gas tank is provided with an air delivery pipe used for being connected with an air inlet of an air conditioner to be detected, and the air delivery pipe comprises a first air delivery pipe connected with the air outlet of the gas tank and a second air delivery pipe connected with the air inlet of the air conditioner to be detected; the control valve is mounted at the joint of the first gas conveying pipe and the second gas conveying pipe and used for controlling the opening and closing size of a channel between the first gas conveying pipe and the second gas conveying pipe; the first pressure pipe is led out from the first gas conveying pipe, the second pressure pipe is led out from the second gas conveying pipe, and the micro differential pressure sensor is installed at the joint of the first pressure pipe and the second pressure pipe and used for judging the pressure difference between the interior of the first pressure pipe and the interior of the second pressure pipe. According to the embodiment, the principle of pressure balance of double independent systems is adopted, the pressure difference value between the to-be-detected air conditioner and the gas tank system is measured through the micro differential pressure sensor, and whether the to-be-detected air conditioner unit is well sealed or not is rapidly judged.

Description

Technical Field

[0001] This utility model relates to a detection device, and more particularly to a rapid leak detection device for air conditioner testing. Background Technology

[0002] During the production of large air conditioning units, there is a quality inspection process that involves testing the sealing of the internal piping system. Traditional testing methods are time-consuming, such as filling the system with nitrogen and observing for a 12-hour period to determine if the pressure inside the piping system has significantly decreased, thus assessing the system's sealing performance. Alternatively, a handheld halogen leak detector can be used, but large air conditioning units have numerous weld points, making accurate testing difficult. Usually, both methods are used simultaneously. However, this increases testing costs and reduces efficiency. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a rapid leak detection device that can detect whether there is a leak in the piping system of an air conditioning unit.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a rapid leak detection device for air conditioner testing, comprising:

[0005] A gas cylinder, the gas cylinder having a gas supply pipe at its outlet for connecting to the air inlet of the air conditioner to be tested, the gas supply pipe including a first gas supply pipe connected to the gas outlet of the gas cylinder and a second gas supply pipe connected to the air inlet of the air conditioner to be tested.

[0006] A control valve installed at the junction of the first and second gas pipelines and used to control the opening and closing of the channel between the first and second gas pipelines.

[0007] A first pressure tube leading from the first gas supply pipe, a second pressure tube leading from the second gas supply pipe, and a micro differential pressure sensor installed at the junction of the first and second pressure tubes for determining the pressure difference between the first and second pressure tubes.

[0008] The beneficial effects of this utility model are as follows: The air outlet of the air conditioner under test is sealed. Then, a gas supply pipe connects the gas tank and the air inlet of the standby air conditioner. The control valve is opened to allow the gas in the gas tank to fill the pipeline inside the air conditioner under test, raising the pressure in the pipeline to 3 MPa. At this point, the pressure inside the gas tank and the first pressure pipe, and the second pressure pipe and the air conditioner under test, form two independent sealed systems with consistent pressure. The reading of the micro-differential pressure sensor is 0. Afterward, the control valve is closed, and the micro-differential pressure sensor is read every ten minutes. If the data remains unchanged for one hour, the air conditioner under test is deemed to have a satisfactory seal; if the data continuously increases for one hour, the air conditioner under test is deemed to have a poor seal. This embodiment uses the principle of dual independent system pressure balance, utilizing a micro-differential pressure sensor to measure the pressure difference between the air conditioner under test and the gas tank system, quickly determining whether the air conditioner unit under test is properly sealed.

[0009] The system is further configured such that a first electronic expansion valve is installed at the first pressure pipe to control the opening and closing of the channel within the first pressure pipe, and a second electronic expansion valve is installed at the second pressure pipe to control the opening and closing of the channel within the second pressure pipe. During the initial inflation process, both the first and second electronic expansion valves are in the closed state. This is to prevent the micro-differential pressure sensor from being impacted and damaged during rapid inflation of the gas tank.

[0010] The control valve is further configured to be a ball valve.

[0011] A further setting is made: the gas tank is a nitrogen tank. Nitrogen is an inert gas and will not cause corrosion to the internal pipes of the air conditioner. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the air conditioner to be tested connected according to an embodiment of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings:

[0014] The micro differential pressure sensor 6 is a device that employs a high-precision, high-stability micro-pressure chip and undergoes rigorous and precise temperature compensation, linear compensation, signal amplification, V / I conversion, reverse polarity protection, and pressure overload current limiting. The working principle of the micro differential pressure sensor 6 is that the pressure of the medium acts directly on the sensor's diaphragm, causing a micro-displacement of the diaphragm proportional to the medium pressure. This changes the sensor's resistance, and electronic circuitry detects this change, converting it into a standard signal corresponding to that pressure.

[0015] like Figure 1As shown in the figure, this embodiment includes a gas tank 1. An air delivery pipe 2 for connecting to the intake port of the air conditioner 7 to be inspected is provided at the air outlet of the gas tank 1. The air delivery pipe 2 includes a first air delivery pipe 21 connected to the air outlet of the gas tank 1 and a second air delivery pipe 22 connected to the intake port of the air conditioner 7 to be inspected. A ball valve 3 is installed at the connection of the first air delivery pipe 21 and the second air delivery pipe 22, and the ball valve 3 is used to control the opening and closing size of the channel between the first air delivery pipe 21 and the second air delivery pipe 22. A first pressure pipe 41 is led out from the first air delivery pipe 21, a second pressure pipe 42 is led out from the second air delivery pipe 22. A first electronic expansion valve 51 for controlling the opening and closing size of the channel in the first pressure pipe 41 is installed at the first pressure pipe 41, and a second electronic expansion valve 52 for controlling the opening and closing size of the channel in the second pressure pipe 42 is installed at the second pressure pipe 42. A micro differential pressure sensor 6 is installed at the connection of the first pressure pipe 41 and the second pressure pipe 42, and the micro differential pressure sensor 6 is used to judge the pressure difference between the first pressure pipe 41 and the second pressure pipe 42. Since the micro differential pressure sensor 6 belongs to the prior art and its specific installation method also belongs to the routine operation, it will not be elaborated in this application. In addition, the gas tank 1 is a nitrogen tank. Nitrogen is an inert gas and will not cause erosion of the internal pipeline of the air conditioner.

[0016] In the present utility model, the air outlet of the air conditioner 7 to be inspected is blocked. Then, the air delivery pipe is used to connect the gas tank 1 and the intake port of the standby air conditioner 6. The first electronic expansion valve 51 and the second electronic expansion valve 52 are closed. The ball valve 3 is opened to fill the pipeline in the air conditioner 7 to be inspected with nitrogen in the gas tank 1 until the pressure value in the pipeline reaches 3 Mpa. At this time, the pressure in the gas tank and the air conditioner 7 to be inspected respectively form two independent closed systems, and the pressures at the two places are the same, and the reading of the micro differential pressure sensor 6 is 0. Then the ball valve 3 is closed, and the first electronic expansion valve 41 and the second electronic expansion valve 42 are slowly opened. Then, every ten minutes, the micro differential pressure sensor 6 is read. If the data remains unchanged for one hour continuously, it is determined that the airtightness of the air conditioner to be inspected 7 is qualified; if the data continuously increases for one hour continuously, it is determined that the airtightness of the air conditioner to be inspected 7 is unqualified. This embodiment adopts the principle of pressure balance of two independent systems, and uses the micro differential pressure sensor 6 to measure the pressure difference between the system of the air conditioner 7 to be inspected and the gas tank Ⅰ to quickly judge whether the airtightness of the air conditioner unit to be inspected is good.

Claims

1. A rapid leak detection device for air conditioner testing, characterized in that, Including: A gas cylinder, the gas cylinder having a gas supply pipe at its outlet for connecting to the air inlet of the air conditioner to be tested, the gas supply pipe including a first gas supply pipe connected to the gas outlet of the gas cylinder and a second gas supply pipe connected to the air inlet of the air conditioner to be tested. A control valve installed at the junction of the first and second gas pipelines and used to control the opening and closing of the channel between the first and second gas pipelines. A first pressure tube leading from the first gas supply pipe, a second pressure tube leading from the second gas supply pipe, and a micro differential pressure sensor installed at the junction of the first and second pressure tubes for determining the pressure difference between the first and second pressure tubes.

2. The rapid leak detection device for air conditioner testing according to claim 1, characterized in that: A first electronic expansion valve for controlling the opening and closing size of the channel inside the first pressure pipe is installed at the first pressure pipe, and a second electronic expansion valve for controlling the opening and closing size of the channel inside the second pressure pipe is installed at the second pressure pipe.

3. The rapid leak detection device for air conditioner testing according to claim 1, characterized in that: The control valve is a ball valve.

4. The rapid leak detection device for air conditioner testing according to claim 1, characterized in that: The gas cylinder is a nitrogen cylinder.

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