Motor casing air tightness detection device

Abstract

The utility model relates to the technical field of motor casing detection, in particular to a motor casing air tightness detection device, which comprises an air pump, the air pump is connected and communicated with a pressure regulator, the pressure regulator is connected and communicated with a first electromagnetic valve, the first electromagnetic valve is connected with an inlet of a workpiece to be detected through a first pipeline, and the first pipeline is connected with a second pipeline. The outlet of the to-be-tested workpiece is connected and communicated with a second electromagnetic valve through a second pipeline, and the second electromagnetic valve is communicated with the outside; the time relay, the first electromagnetic valve and the second electromagnetic valve are all realized through the programmable logic controller, so that the consistency and repeatability of each detection process are ensured, manual operation errors are eliminated, and the detection efficiency and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of motor housing testing technology, specifically a motor housing airtightness testing device. Background Technology

[0002] Currently, water-cooled structures are used in motor housings to improve cooling efficiency. Water-cooled structures require water-cooling channels to be opened on the inner wall of the motor housing. In order to prevent water leakage from the water-cooling channels from affecting the normal operation of the motor, it is necessary to test the airtightness of the water-cooling channels of the motor. At the same time, leak points can be found, which can provide a reference for the improvement of the casting.

[0003] Chinese utility model patent application number 202122247829.X proposes a motor housing airtightness testing device, including a testing water tank, a lifting platform, a pressing component, and an airtightness testing component. The outer surface of the testing water tank is fixed with an annular platform. The pressing component includes a pressing platform, a gantry frame, and two telescopic drive cylinders, which allows the motor housing to be installed on the lifting platform quickly and is easier for operators to operate. However, in this solution, the inflation and deflation of the motor housing depends on the operator and cannot determine the inflation time and the internal pressure change of the motor housing, resulting in a low degree of automation. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to design a motor housing airtightness testing device. This device, by setting up a pressure test and timing device, can conveniently monitor the inflation time and the pressure change inside the motor housing.

[0005] To solve the above-mentioned technical problems, the motor housing airtightness testing device of this utility model includes an air pump, which is connected and communicated with a pressure regulator. The pressure regulator is connected and communicated with a first solenoid valve. The first solenoid valve is connected to the inlet of the workpiece to be tested through a first pipe. The outlet of the workpiece to be tested is connected and communicated with a second solenoid valve through a second pipe. The second solenoid valve is communicated with the outside.

[0006] Preferably, it also includes a time relay, which is electrically connected to the first solenoid valve and the second solenoid valve respectively.

[0007] Preferably, a first pressure gauge is installed on the first pipeline, and a second pressure gauge is installed on the second pipeline.

[0008] Preferably, the first pressure gauge is electrically connected to the first solenoid valve, and the second pressure gauge is electrically connected to the second solenoid valve.

[0009] Preferably, a first flange is fixed on the workpiece to be tested, and the first flange is connected to the inlet of the internal cooling pipe of the workpiece to be tested. A second flange is also fixed on the workpiece to be tested, and the second flange is connected to the outlet of the internal cooling pipe of the workpiece to be tested.

[0010] Preferably, the end of the first pipeline away from the first solenoid valve is connected to and communicates with a first quick connector, which can be fixed to the first flange by a first bolt. The end of the second pipeline away from the second solenoid valve is connected to and communicates with a second quick connector, which can be fixed to the second flange by a second bolt.

[0011] Preferably, both the first quick connector and the second quick connector are provided with a protrusion, the protrusion having a gas passage inside, and the protrusion being able to extend into the openings of the first flange and the second flange.

[0012] Preferably, a sealing ring is fitted on the outer side of the protrusion, and the sealing ring can abut against the first flange and the second flange.

[0013] In summary, the beneficial effects of this utility model are as follows:

[0014] ① The first solenoid valve is opened via a time relay output signal, while the second solenoid valve is closed and held shut. The time relay has a built-in delay control; after the set time, the time relay output signal closes the first solenoid valve to stop gas filling; simultaneously, it opens the second solenoid valve to release the gas from the workpiece under test. The control process is implemented by a programmable logic controller, ensuring the consistency and repeatability of each testing process, eliminating human error, and improving testing efficiency and reliability.

[0015] ② By installing a first switch pressure gauge on the first pipeline and a second switch pressure gauge on the second pipeline, blockage in the air passage can be prevented, thus avoiding the failure to detect unqualified products. Attached Figure Description

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 This is a schematic diagram of the structure of a motor housing airtightness testing device according to the present invention;

[0018] Figure 2 This is a schematic diagram showing the fit between the workpiece to be tested and the quick connector;

[0019] Figure 3 This is a schematic diagram of the structure of the first quick connector;

[0020] Figure 4 This is a schematic diagram of the second quick connector.

[0021] In the diagram: 1-Air pump; 2-Pressure regulator; 3-First solenoid valve; 4-First pipeline; 41-First pressure gauge; 5-Second pipeline; 51-Second pressure gauge; 6-Second solenoid valve; 7-Time relay; 80-First flange; 90-Second flange; 81-First quick connector; 82-First bolt; 91-Second quick connector; 92-Second bolt; 11-Protrusion; 12-Sealing ring; 100-Workpiece to be tested. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0027] Example 1

[0028] See attached document Figure 1-4This utility model discloses an airtightness testing device for an electric motor housing, including an air pump 1 that continuously provides test gas. The air pump 1 is connected to and communicates with a pressure regulator 2. The pressure regulator 2 can accurately adjust and stabilize the high pressure or unstable air pressure generated by the air pump 1 to the specific target pressure value required for the airtightness test, ensuring that the pressure filled into the workpiece 100 under test is constant and meets the test standards.

[0029] The pressure regulator 2 is connected to and in communication with the first solenoid valve 3, which is a key switch for controlling the flow of test gas to the workpiece 100 under test. The first solenoid valve 3 is a normally closed solenoid valve; when it is energized and opened, the precisely pressure-regulated test gas can pass through.

[0030] The first solenoid valve 3 is connected to the inlet of the workpiece 100 to be tested through the first pipe 4, and the outlet of the workpiece 100 to be tested is connected to the second solenoid valve 6 through the second pipe 5. The second solenoid valve 6 is connected to the outside.

[0031] The main function of the second solenoid valve 6 is to control the release of gas inside the workpiece at the end of the test cycle or when rapid pressure relief is required. The second solenoid valve 6 is a normally open solenoid valve. When gas is introduced, the second solenoid valve 6 closes, and the workpiece 100 under test enters the pressure holding state. When the second solenoid valve 6 is open, the gas inside the workpiece is released through the valve.

[0032] For ease of control, a time relay 7 is introduced in this solution. The time relay 7 is electrically connected to both the first solenoid valve 3 and the second solenoid valve 6. The electrical signal output by the time relay 7 directly controls the opening and closing of these two solenoid valves. Specifically, initially, the time relay 7 outputs a signal to open the first solenoid valve 3, while simultaneously closing and holding the second solenoid valve 6. The time relay 7 has a built-in delay control. After the set time, the time relay 7 outputs a signal to close the first solenoid valve 3 to stop the inflation; at the same time, it opens the second solenoid valve 6 to release the gas inside the workpiece 100 under test.

[0033] The above control process is implemented by a programmable logic controller, which ensures the consistency and repeatability of each detection process, eliminates human error, and improves detection efficiency and reliability.

[0034] As a further explanation of this embodiment, a first switch pressure gauge 41 is installed on the first pipe 4, and a second switch pressure gauge 51 is installed on the second pipe 5.

[0035] The first pressure gauge 41 is electrically connected to the first solenoid valve 3, and the second pressure gauge 51 is electrically connected to the second solenoid valve 6.

[0036] The first switch pressure gauge 41 monitors the pipeline pressure of the first pipeline 4 in real time during the inflation stage, serving as a hardware protection layer for the upper limit of inflation pressure. When the pressure in the first pipeline 4 exceeds the preset safety threshold, it immediately outputs a signal to the first solenoid valve 3 to forcibly close the air intake passage, preventing damage to the workpiece or sensor due to overpressure.

[0037] The second pressure gauge 51 monitors the pressure in the second pipeline 5 during the inflation phase in real time, serving as a hardware protection layer for the upper limit of inflation pressure. When the pressure in the second pipeline 5 exceeds the preset safety threshold, it immediately outputs a signal to the second solenoid valve 6, forcibly opening the vent passage to prevent damage to the workpiece or sensor due to overpressure. Simultaneously, the second pressure gauge 51 can also detect whether the residual pressure within the workpiece 100 under test exceeds the preset safe discharge value at the end of the testing cycle.

[0038] As a further explanation of this embodiment, a first flange 80 is fixed on the workpiece 100 to be tested. The first flange 80 is connected to the inlet of the internal cooling pipe of the workpiece 100 to be tested and can be used as an air inlet for air tightness testing. A second flange 90 is also fixed on the workpiece 100 to be tested. The second flange 90 is connected to the outlet of the internal cooling pipe of the workpiece 100 to be tested and can be used as an air outlet for air tightness testing.

[0039] A first quick connector 81 is connected to and communicates with the end of the first pipe 4 away from the first solenoid valve 3. The first quick connector 81 can be fixed to the first flange 80 by a first bolt 82. A second quick connector 91 is connected to and communicates with the end of the second pipe 5 away from the second solenoid valve 6. The second quick connector 91 can be fixed to the second flange 90 by a second bolt 92.

[0040] The first quick connector 81 and the second quick connector 91 are each provided with a protrusion 11. The protrusion 11 has a through gas channel to achieve seamless gas connection. The protrusion 11 can extend into the opening of the first flange 80 and the second flange 90.

[0041] A sealing ring 12 is fitted around the outside of the protrusion 11, and the sealing ring 12 can abut against the first flange 80 and the second flange 90. The sealing ring 12 is a fluororubber O-ring to achieve a seal and ensure the reliability of the gas path test.

[0042] Before starting, the air source pressure is calibrated. The operator mates the first flange 80 of the workpiece to be tested with the first quick connector 81, and the second flange 90 with the second quick connector 91, and locks them with the first bolt 82 and the second bolt 92 respectively.

[0043] After pressing the start button, the time relay 7 activates the control sequence: the first solenoid valve 3 is energized to open the air intake channel, and the second solenoid valve 6 is de-energized to close the exhaust channel. The test gas, after being stabilized by the pressure regulator, flows through the first pipe 4 to the internal cooling pipe of the workpiece 100 under test. After inflation, it enters the pressure holding state, at which time the time relay 7 starts the preset pressure holding countdown.

[0044] After the test is completed, the first solenoid valve 3 closes the air intake channel and the second solenoid valve 6 opens the exhaust channel to remove the gas inside the workpiece 100 under test, thus separating the workpiece 100 from the air circuit and completing the test.

[0045] Example 2

[0046] The difference between this embodiment and embodiment one is that this embodiment allows for observation of the leak location. After immersing the workpiece 100 to be tested in water, the test process is started, and the location of the air bubbles can be observed to pinpoint the leak point.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, multiple improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A device for testing the airtightness of an electric motor housing, comprising an air pump (1), characterized in that, The air pump (1) is connected to and communicates with the pressure regulator (2). The pressure regulator (2) is connected to and communicates with the first solenoid valve (3). The first solenoid valve (3) is connected to the inlet of the workpiece to be tested (100) through the first pipe (4). The outlet of the workpiece to be tested (100) is connected to and communicates with the second solenoid valve (6) through the second pipe (5). The second solenoid valve (6) is connected to the outside.

2. The motor housing airtightness testing device as described in claim 1, characterized in that, It also includes a time relay (7), which is electrically connected to the first solenoid valve (3) and the second solenoid valve (6) respectively.

3. The motor housing airtightness testing device as described in claim 2, characterized in that, A first switch pressure gauge (41) is installed on the first pipe (4), and a second switch pressure gauge (51) is installed on the second pipe (5).

4. The motor housing airtightness testing device as described in claim 3, characterized in that, The first switch pressure gauge (41) is electrically connected to the first solenoid valve (3), and the second switch pressure gauge (51) is electrically connected to the second solenoid valve (6).

5. The motor housing airtightness testing device as described in claim 4, characterized in that, A first flange (80) is fixed on the workpiece to be tested (100), and the first flange (80) is connected to the inlet of the internal cooling pipe of the workpiece to be tested (100). A second flange (90) is also fixed on the workpiece to be tested (100), and the second flange (90) is connected to the outlet of the internal cooling pipe of the workpiece to be tested (100).

6. The motor housing airtightness testing device as described in claim 5, characterized in that, The first pipe (4) is connected to and communicates with a first quick connector (81) at the end away from the first solenoid valve (3). The first quick connector (81) can be fixed to the first flange (80) by a first bolt (82). The second pipe (5) is connected to and communicates with a second quick connector (91) at the end away from the second solenoid valve (6). The second quick connector (91) can be fixed to the second flange (90) by a second bolt (92).

7. The motor housing airtightness testing device as described in claim 6, characterized in that, The first quick connector (81) and the second quick connector (91) are each provided with a protrusion (11), the protrusion (11) is provided with a gas passage, and the protrusion (11) can extend into the opening of the first flange (80) and the second flange (90).

8. The motor housing airtightness testing device as described in claim 7, characterized in that, A sealing ring (12) is fitted on the outside of the protrusion (11), and the sealing ring (12) can abut against the first flange (80) and the second flange (90).

Images