Comprehensive test bed for purging device

Abstract

The utility model relates to a comprehensive test bed for a purging device, which solves the problems that the existing positive pressure and purging device is troublesome to test and no special equipment is provided. The device comprises a motor housing simulation unit. The positive pressure purging device is installed on the motor shell simulation unit, and the positive pressure purging device is of a structure for supplying air to the interior of the motor shell simulation unit; and the data monitoring unit is respectively connected with the positive pressure purging device and the motor shell simulation unit, and the data monitoring unit is used for displaying the purging flow and the leakage compensation amount and monitoring the pressure fluctuation in the motor shell simulation unit. Compared with the prior art, the utility model has the following advantages: 1) the positive pressure purging device is detachably connected to the motor housing simulation unit, so that the working processes of the positive pressure purging devices with different specifications can be tested; leakage of a motor shell can be simulated through the leakage amount adjusting unit, flow and pressure data are monitored, and a safety valve is additionally arranged to prevent internal overpressure.

Description

Technical Field

[0001] The utility model relates to the technical field of test equipment and detection, in particular to a comprehensive test bench for a purge device. Background Art

[0002] When operating in hazardous environments, motors are susceptible to flammable gases and dust, leading to performance degradation and potential safety hazards. To ensure safe operation in hazardous environments, motors must be retrofitted with explosion-proof technology. Among various explosion-proof retrofit measures, a relatively reliable and effective method is to install appropriate positive pressure and purge devices on the motors.

[0003] However, due to the differences in motor brands, models and sizes, the performance requirements for the positive pressure purge device, such as purge flow, purge time, and positive pressure range, are also different. Therefore, a professional test bench is urgently needed to test the performance and working status of the positive pressure purge device. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a comprehensive test bench for a purge device, which solves the problem that the positive pressure and purge device tests are troublesome and there is no dedicated equipment.

[0005] The utility model solves the technical problem by the following technical means: a comprehensive test bench for a purge device, comprising a motor housing simulation unit;

[0006] A positive pressure purge device, which is installed on the motor housing simulation unit and is a structure for supplying air to the interior of the motor housing simulation unit;

[0007] A data monitoring unit is connected to the positive pressure purge device and the motor housing simulation unit respectively. The data monitoring unit displays the purge flow rate and the leakage compensation amount, and monitors the pressure fluctuation inside the motor housing simulation unit.

[0008] Preferably, a leakage adjustment unit is further included, which is installed on the side of the motor housing simulation unit, and the purge gas inside the motor housing simulation unit can be released to the outside through the leakage adjustment unit.

[0009] Preferably, the data monitoring unit includes a vortex flowmeter and a micro-pressure transmitter. The vortex flowmeter is installed between the air source and the air intake pipe of the positive pressure purge device. The micro-pressure transmitter is used to monitor the pressure fluctuations inside the motor housing simulation unit and transmit the data to the computer in real time.

[0010] Preferably, the leakage adjustment unit includes a flow orifice plate fixedly connected to the motor housing simulation unit, the flow orifice plate is provided with a through hole, and a horizontally sliding baffle is provided on the outer side of the flow orifice plate, the baffle is a structure for blocking the through hole.

[0011] Preferably, a safety valve is further included, and the safety valve is communicated with the motor housing simulation unit.

[0012] Preferably, the positive pressure purge device includes a control box and a purge valve, the air inlet of the positive pressure purge device is connected to the air source, and the air outlet is connected to the inside of the motor housing simulation unit.

[0013] Compared with the prior art, the present invention has the following advantages: 1) the positive pressure purge device can be detachably connected to the motor housing simulation unit, so that the work flow of positive pressure purge devices of different specifications can be tested; 2) the leakage of the motor housing can be simulated through the leakage adjustment unit; 4) the flow and pressure data can be monitored; 4) a safety valve is installed to prevent internal overpressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the overall axial side structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the leakage adjustment unit of the utility model;

[0018] In the figure: 1. Motor housing simulation unit; 2. Positive pressure purge device; 3. Vortex flowmeter; 4. Micro pressure transmitter; 5. Purge valve; 6. Leakage adjustment unit; 7. Safety valve; 8. Cylinder; 9. Flow orifice plate; 10. Baffle. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1 —3 Further detailed description of the specific implementation methods of the utility model.

[0020] like Figure 1-3 As shown, a comprehensive test bench for a purge device includes a motor housing simulation unit 1, which is composed of

[0021] Welded from stainless steel, it simulates the motor housing, with wheels mounted on the bottom and handles welded to the sides for easy position adjustment. The front features a hook for mounting a positive-pressure purge device 2 and a notch for installing a purge valve 5. Side notches accommodate safety valve 7 and an electric butterfly valve. A quick-connect connector near the front bottom allows for purge gas to enter. A maintenance port is located on the back for inspection and cleaning. During daily use, this port is sealed with a bolted plate and supplemented by a gasket to prevent air leaks.

[0022] Positive-pressure purge device 2 is mounted to the front of motor housing simulation unit 1 via a bracket. It consists of a control box and a purge valve 5. The control box is mounted in the center of the front of motor housing simulation unit 1, and the purge valve 5 is mounted in the upper right corner of the front. The air inlet of positive-pressure purge device 2 is connected to the air source, and the air outlet is connected to the interior of motor housing simulation unit 1.

[0023] The data monitoring units are a vortex flowmeter 3 installed at the gas source inlet and a micro-pressure transmitter 4 installed at the motor housing simulation unit 1. The vortex flowmeter 3 is installed between the gas source and the air inlet pipe of the positive pressure purge device 2. The flowmeter can display the purge flow and leakage compensation amount; the micro-pressure transmitter 4 is used to monitor the pressure fluctuations inside the motor housing simulation unit 1 and transmit the data to the computer in real time.

[0024] In order to facilitate installation, the air pipes at the air inlet and outlet are composed of pressure-resistant hoses equipped with quick connectors. There are multiple quick clamps at the installation position of the purge valve 5 to clamp the purge valve 5.

[0025] The leakage adjustment unit 6 mainly comprises a double-acting cylinder 8 and a flow orifice 9. The piston rod of the cylinder 8 is connected to a baffle 10 through a thread, and the baffle 10 is pressed on the flow orifice 9. When the cylinder 8 is in motion, the baffle 10 leaves the flow orifice 9 along with the piston rod of the cylinder 8. At this time, the purge gas inside the motor housing simulation unit 1 can be released to the outside through the orifice, thereby simulating the leakage of a large motor housing. By replacing the flow orifice 9 with different calibers, the leakage of different motor housings can be simulated.

[0026] The flow orifice plate 9 is designed with multiple flow ranges ranging from 100 to 6000 liters per minute. The principle is that when air flows through the orifice plate, the flow velocity increases and the static pressure decreases. The flow rate can be calculated by the pressure difference before and after the orifice plate. The formula is: Q = C × A × √(2 × ΔP / (ρ × (1 - (d / D) 4Assuming an orifice diameter of 50 mm (0.05 m), an orifice outer diameter of 108 mm (0.108 m), a pressure differential of 650 Pa, an air density of 1.225 kg / m³, and a flow coefficient of 0.6, the flow rate is approximately 2358 L / min. The specific leakage amount can be measured using the vortex flowmeter 3 within the data monitoring unit.

[0027] Safety valve 7 is an electrically controlled butterfly valve, closed by default. When the internal air pressure of the motor housing simulation unit, as detected by the micro-pressure transmitter 4, reaches a threshold, it opens, reducing the internal air pressure to a safe range. Generally, this threshold should be greater than the threshold of the safety valve 7 built into the positive-pressure purge device 2. This prevents accidents caused by failure of the safety valve 7 of the positive-pressure purge device 2 without affecting normal commissioning.

[0028] Before testing begins, first install the positive pressure purge device 2 on the motor housing simulation unit 1, ensuring that the air pipes on both sides are properly connected. Next, secure the purge valve 5 with a quick-release clamp, open the air supply, and purge for the predetermined purge time. During this time, monitor the internal housing pressure and purge flow rate using a micro-pressure transmitter 4 and vortex flowmeter 3 connected to a computer to ensure compliance with standards.

[0029] During the leakage compensation phase after the purge is complete, the leakage adjustment unit is operated to simulate casing leakage in motors of different specifications. Based on the flow rate changes displayed by vortex flowmeter 3, the leakage compensation amount is determined to meet the standard. The leakage compensation pressure valve in the positive pressure purge device 2 is then adjusted to increase or decrease the leakage compensation amount.

[0030] During the test, if the internal pressure of the motor housing simulation unit 1 rises abnormally due to a failure of the positive pressure purge device 2 and reaches the safety threshold set by the safety valve 7, the internal electric butterfly valve will automatically open to release the pressure.

[0031] Test data will be recorded and collected until the end of the testing process.

[0032] There is a maintenance port on the back of the test bench, which is sealed by a square metal plate with bolts and a sealing gasket for auxiliary sealing. During maintenance, the port can be opened to allow access to the interior for cleaning and maintenance.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A comprehensive test bench for purge device, characterized in that: including a motor housing simulation unit (1); A positive pressure purge device (2), the positive pressure purge device (2) being installed on the motor housing simulation unit (1), and the positive pressure purge device (2) being a structure for supplying air to the interior of the motor housing simulation unit (1); A data monitoring unit is provided, wherein the data monitoring unit is connected to the positive pressure purge device (2) and the motor housing simulation unit (1) respectively, and the data monitoring unit displays the purge flow rate and the leakage compensation amount, and monitors the pressure fluctuation inside the motor housing simulation unit (1).

2. A comprehensive test bench for a purge device according to claim 1, characterized in that: It also includes a leakage adjustment unit, which is installed on the side of the motor housing simulation unit (1), and the purge gas inside the motor housing simulation unit (1) can be released to the outside through the leakage adjustment unit.

3. A comprehensive test bench for a purge device according to claim 1, characterized in that: The data monitoring unit includes a vortex flowmeter (3) and a micro-pressure transmitter (4). The vortex flowmeter (3) is installed between the air source and the air inlet pipe of the positive pressure purge device (2). The micro-pressure transmitter (4) is used to monitor the pressure fluctuation inside the motor housing simulation unit (1) and transmit the data to the computer in real time.

4. A comprehensive test bench for a purge device according to claim 2, characterized in that: The leakage adjustment unit (6) includes a flow orifice plate (9) fixedly connected to the motor housing simulation unit (1), the flow orifice plate (9) is provided with a through hole, and a horizontally sliding baffle (10) is provided on the outside of the flow orifice plate (9), and the baffle (10) is a structure for blocking the through hole.

5. A comprehensive test bench for purging device according to claim 1, characterized in that: It also includes a safety valve (7), which is communicated with the motor housing simulation unit (1).

6. A comprehensive test bench for a purge device according to claim 1, characterized in that: The positive pressure purge device (2) comprises a control box and a purge valve (5); an air inlet of the positive pressure purge device (2) is connected to an air source, and an air outlet is connected to the interior of the motor housing simulation unit (1).

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