Synchronous test system and test method for impeller efficiency, complete machine efficiency and motor efficiency

Abstract

The invention relates to a synchronous test system and test method for impeller efficiency, complete machine efficiency and motor efficiency, and provides a synchronous test system for impeller efficiency, complete machine efficiency and motor efficiency. Comprising a test platform, a standing shaft arranged on the test platform through two bearings, an installation flange plate fixedly connected to the right end of the standing shaft and used for positioning and installing a tested fan, a lock head and a torque sensor which are arranged on the test platform and located on the left side of the standing shaft, and an air chamber arranged on the right side of the test platform. The lock head is connected with the static shaft through the coupler to limit rotation of the static shaft, the torque sensor is used for measuring and outputting torque on the static shaft, the tested fan comprises a motor and an impeller, the motor of the tested fan is electrically connected with an electrical parameter meter, and the wind chamber is connected with the impeller of the tested fan through a wind ring; on the other hand, the invention provides a testing method of the synchronous testing system for the impeller efficiency, the whole machine efficiency and the motor efficiency.

Description

Technical Field

[0001] The present invention relates to a synchronous test system and test method for impeller efficiency, overall machine efficiency, and motor efficiency. Background Art

[0002] When testing the above three efficiencies of traditional fans, it is often necessary to conduct separate tests to test the performance and efficiency of the fans under various working conditions and rotational speeds. This is complex and prone to calculation errors. Even for the same fan, it will be affected by the aerodynamic performance and error transmission brought by different test devices installed to capture the overall machine efficiency and impeller efficiency under the fan working conditions.

[0003] For example, when measuring the impeller efficiency by using the calibrated motor method, it is necessary to plan the motor efficiency at the required rotational speed of the fan in advance, and determine the impeller efficiency at the fan working condition rotational speed at this time through the actual input and output power of the motor. This will bring measurement error transmission; the fitting accuracy of the secondary calculated virtual power point; the fan efficiency at multiple rotational speeds needs to correspond to the motor efficiency at multiple rotational speeds to ensure data usage. When obtaining the impeller efficiency by using the torque method, it is necessary to calculate the efficiency by measuring the actual working condition torque of the installation shaft of the impeller. There are several points that need attention. One is that the internal effect of the impeller installed by the torque method is not the same as the state of the motor housing in the actual product impeller, which will cause differences in aerodynamic performance; the other is the influence of the torque bench on the actual state of the product. Summary of the Invention

[0004] Aiming at the deficiencies in the above problems, the present invention provides a synchronous test system and test method for impeller efficiency, overall machine efficiency, and motor efficiency.

[0005] On the one hand, the present invention provides a synchronous test system for impeller efficiency, overall machine efficiency, and motor efficiency, including a test platform, a static shaft configured on the test platform through two bearings, a mounting flange fixedly connected to the right end of the static shaft for positioning and installing the fan to be tested, a lock head and a torque sensor arranged on the test platform and located on the left side of the static shaft, and an air chamber arranged on the right side of the test platform. The lock head is connected to the static shaft through a coupling to restrict the rotation of the static shaft. The torque sensor is used to measure and output the torque on the static shaft. The fan to be tested includes two parts, a motor and an impeller. The motor of the fan to be tested is electrically connected to an electrical parameter meter. The air chamber is connected to the impeller part of the fan to be tested through an air ring. Sensors for measuring the gas volume flow and gas pressure are arranged inside the air chamber.

[0006] Further, the center lines of the lock head, the torque sensor, the static shaft, the mounting flange, and the air ring are all on the same straight line. The electrical parameter meter is used to record the voltage value and current value when the motor of the fan to be tested is working.

[0007] On the other hand, the present invention provides a test method for a synchronous test system of impeller efficiency, overall machine efficiency, and motor efficiency, including the following steps: S1. Start the system, and make the motor of the fan to be tested operate at the rated speed, and the gas in the air chamber is discharged outward through the air ring and the impeller of the fan to be tested; S2. Measure the gas volume flow and gas pressure by the sensors built in the air chamber to obtain the fan air power; measure the torque value borne by the static axis by the torque sensor to obtain the impeller power of the fan to be tested; record the voltage value and current value when the motor of the fan to be tested works by the electrical parameter meter to obtain the total input power; S3. Calculate the impeller efficiency, overall machine efficiency, and motor efficiency according to the obtained fan air power, impeller power of the fan to be tested, and total input power.

[0008] The beneficial effects of the present invention compared with the prior art are as follows: The test system can be used for synchronous testing of impeller efficiency, overall machine efficiency, and motor efficiency. The test is direct and efficient. At the same time, because the actual fan product to be tested is directly tested, the simulation under actual application is realized, and the factors such as bearing instability and influence of the internal structure of the impeller existing in the traditional torque method measurement are overcome. The test result is more accurate than the traditional torque method. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of a synchronous test system for impeller efficiency, overall machine efficiency, and motor efficiency.

[0010] In the figure: 1. Test platform; 2. Lock head; 3. Torque sensor; 4. Coupling; 5. Bearing; 6. Static axis; 7. Installation flange; 8. Fan to be tested; 9. Air ring; 10. Air chamber; 11. Electrical parameter meter. Detailed Embodiment

[0011] The present invention relates to a synchronous test system and test method for impeller efficiency, overall machine efficiency, and motor efficiency, which overcomes the factors such as bearing instability and influence of the internal structure of the impeller existing in the traditional torque method measurement.

[0012] In the first aspect of the present invention, a synchronous test system for impeller efficiency, overall machine efficiency, and motor efficiency is provided, as Figure 1As shown in the figure, it includes a test platform 1, a stationary shaft 6 arranged on the test platform 1 through two bearings 5, a mounting flange 7 fixedly connected to the right end of the stationary shaft 6 for positioning and installing the fan under test 8, a locking head 2 and a torque sensor 3 arranged on the test platform 1 and on the left side of the stationary shaft 6, and an air chamber 10 arranged on the right side of the test platform 1. The locking head 2 is connected to the stationary shaft 6 through a coupling 4 to limit the rotation of the stationary shaft 6. The torque sensor 3 is used to measure and output the torque on the stationary shaft 6. The fan under test 8 includes two parts: a motor and an impeller. The motor of the fan under test 8 is electrically connected to an electrical parameter meter 11. The air chamber 10 is connected to the impeller part of the fan under test 8 through an air ring 9. The air chamber 10 is internally provided with sensors for measuring the gas volume flow rate and gas pressure. In addition, the center lines of the locking head 2, the torque sensor 3, the stationary shaft 6, the mounting flange 7, and the air ring 9 are all on the same straight line. The electrical parameter meter 11 is used to record the voltage value and current value when the motor of the fan under test 8 is operating.

[0013] In the second aspect of the present invention, a test method for a synchronous test system of impeller efficiency, overall machine efficiency, and motor efficiency is provided, including the following steps: S1. Start the system, and make the motor of the fan under test 8 operate at the rated speed, and the gas in the air chamber 10 is discharged outward through the air ring 9 and the impeller of the fan under test 8. S2. The sensors arranged inside the air chamber 10 measure the gas volume flow rate and gas pressure to obtain the fan air power; the torque sensor 3 measures the torque value borne at the stationary shaft 6 to obtain the impeller power of the fan under test 8; the voltage value and current value when the motor of the fan under test 8 is operating, which are recorded by the electrical parameter meter 11, are used to obtain the total input power. S3. According to the obtained fan air power, the impeller power of the fan under test 8, and the total input power, calculate the impeller efficiency, overall machine efficiency, and motor efficiency.

[0014] The test system can be used for the synchronous test of impeller efficiency, overall machine efficiency, and motor efficiency. The test is direct and efficient. At the same time, because the actual fan product under test is directly tested, the simulation under actual application is realized, and factors such as bearing instability and the influence of the internal structure of the impeller existing in the traditional torque method measurement are overcome. The test results are more accurate than the traditional torque method.

[0015] When specifically used, for the convenience of understanding the present invention, it is described in conjunction with the accompanying drawings. The fan under test can be a single-inlet fan driven by an inner-rotor or outer-rotor motor. The type of the fan under test is not limited to a volute-less centrifugal fan, and can also be an axial flow fan or other types of fans.

[0016] According to Newton's third law, when the impeller of the fan 8 under test rotates, a reaction force will be generated. Different from the traditional torque method, the stationary shaft 6 only transmits torque without rotating. Then, the reaction force of the impeller will be transmitted to the torque sensor 3 through the stationary shaft 6, causing the torque sensor 3 to generate a reverse torque signal of the actual impeller. At this time, the torque of the impeller under a certain working condition at this rotational speed will be measured. Thus, by combining the angular velocity of the fan 8 under test, the impeller power of the fan 8 under test can be calculated. The ratio of the fan air power measured by the air chamber 10 to the impeller power of the fan 8 under test is the impeller efficiency under the working condition of the actual product design structure. This impeller efficiency includes the influence brought by the aerodynamic performance under the actual designed motor installation structure.

[0017] In addition, the total input power is obtained from the electrical parameter table 11. The ratio of the fan air power measured by the air chamber 10 to the total input power is the overall efficiency of the machine, and the ratio of the impeller power of the fan 8 under test to the total input power is the motor efficiency of the fan 8 under test.

[0018] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A synchronous test system for impeller efficiency, whole machine efficiency and motor efficiency, characterized by: The invention comprises a test platform (1), a stationary shaft (6) arranged on the test platform (1) via two bearings (5), a mounting flange (7) fixedly connected to the right end of the stationary shaft (6) for positioning and mounting a fan (8) to be tested, a lock (2) and a torque sensor (3) arranged on the test platform (1) and located on the left side of the stationary shaft (6), and a wind chamber (10) arranged on the right side of the test platform (1), wherein the lock (2) is connected to the stationary shaft (6) via a coupling (4) to limit the rotation of the stationary shaft (6), the torque sensor (3) is used to measure and output the torque on the stationary shaft (6), the fan (8) to be tested comprises a motor and an impeller, the motor of the fan (8) to be tested is electrically connected to an electrical parameter meter (11), the wind chamber (10) is connected to the impeller part of the fan (8) to be tested via a wind ring (9), and the wind chamber (10) is equipped with a sensor for measuring gas volume flow and gas pressure.

2. A synchronous testing system for impeller efficiency, whole machine efficiency and motor efficiency according to claim 1, characterized in that: The center lines of the lock head (2), the torque sensor (3), the stationary shaft (6), the mounting flange (7), and the wind ring (9) are all on the same straight line, and the electrical parameter table (11) is used to record the voltage value and the current value of the motor of the tested fan (8) when it is working.

3. A testing method for a synchronous testing system of impeller efficiency, whole machine efficiency and motor efficiency, characterized in that: The following steps are involved: S1, starting the system, so that the motor of the measured fan (8) runs at a rated speed, and the gas in the wind chamber (10) is discharged to the outside through the wind circle (9) and the impeller of the measured fan (8); S2, using a sensor built into the wind chamber (10) to measure the gas volume flow rate and gas pressure to obtain the air power of the fan; using a torque sensor (3) to measure the torque value borne by the stationary shaft (6) to obtain the impeller power of the measured fan (8); using the voltage value and current value of the motor of the measured fan (8) when it is working recorded in the electrical parameter table (11) to obtain the total input power; S3. Calculate the impeller efficiency, the whole machine efficiency and the motor efficiency according to the obtained fan air power, the impeller power of the fan (8) under test and the total input power.

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