Water pump noise detection device and method

Abstract

The invention belongs to the technical field of water pump detection, and relates to a water pump noise detection device which comprises a sound insulation room, a noise sensor is arranged in the sound insulation room, a water tank is arranged on the outer side of the sound insulation room, the water tank is connected with a water pump to be detected through a circulating pipeline, and the water tank, the circulating pipeline and the water pump form a pressurized closed system. The water pump is located in the sound insulation room, the circulating pipeline penetrates through the room wall of the sound insulation room and is connected with the sound insulation room in a sealed mode, and the water tank is connected with a pressurizing device. The invention further provides a water pump noise detection method. According to the water pump noise detection device and method provided by the invention, interference of cavitation noise on a noise detection result can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pump detection, and relates to a water pump noise detection device and method. Background Art

[0002] The detection of water pump operation noise is an important part of water pump quality detection. In order to ensure the accuracy of the detection results, special noise detection equipment is used in the prior art for detection. Chinese Patent Application CN110589457A (Publication Date: December 20, 2019) discloses a detection device for the operation noise of a vane pump, including a frame, a conveying device, a sound insulation device, a noise detection device and the vane pump to be detected; the frame includes an upper frame and a lower frame, and a rectangular through hole is opened on the upper frame; the conveying device is arranged on the lower frame; the sound insulation device is located above the conveying device and is arranged on the upper frame; the noise detection device is located above the sound insulation device and is arranged on the upper frame.

[0003] By setting the sound insulation device, the above detection device makes the detection environment highly sealed and can effectively prevent interference.

[0004] However, it is found in actual detection that the cavitation noise of the water pump will have a significant impact on the detection results. When the pressure at the inlet of the water pump impeller is lower than the liquid saturation vapor pressure, the liquid vaporizes to form bubbles, and the bubbles quickly burst after entering the high-pressure area with the liquid, generating noise. The cavitation noise will significantly increase the total sound pressure level of the water pump, resulting in the misjudgment of the detection result as "excessive noise", while the actual problem may be due to cavitation rather than mechanical failure, thus leading to unnecessary disassembly and inspection. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a water pump noise detection device and method, which can avoid the interference of cavitation noise on the noise detection results.

[0006] To solve the above technical problems, the object of the present invention is achieved through the following technical solutions:

[0007] A water pump noise detection device includes a sound insulation room, a noise sensor is arranged in the sound insulation room, a water tank is arranged outside the sound insulation room, the water tank is connected to the water pump to be detected through a circulation pipeline, the water tank, the circulation pipeline and the water pump form a pressurizable closed system, the water pump is located in the sound insulation room, the circulation pipeline penetrates through the wall of the sound insulation room and is hermetically connected thereto, and a pressurizing device is connected to the water tank.

[0008] In the above water pump noise detection device, the pressurizing device adopts a device for injecting high-pressure gas, such as an air compressor.

[0009] In the above-mentioned water pump noise detection device, the noise sensor is connected to an external display device for analyzing and displaying noise readings, and the external display device is arranged outside the soundproof room.

[0010] In the above-mentioned water pump noise detection device, the circulating pipeline includes an input pipe and an output pipe. The water pump is vertically arranged and the motor shaft remains horizontal. One end of the input pipe is connected to the bottom of the water tank, and the other end is connected to the water inlet at the bottom of the water pump. One end of the output pipe is connected to the water outlet at the top of the water pump, and the other end is connected to the top of the water tank.

[0011] In the above-mentioned water pump noise detection device, there are multiple water pumps and circulating pipelines. Each water pump and its corresponding circulating pipeline form a detection unit. Different detection units detect water pumps of different specifications, and different specifications of installation flanges adapted to their corresponding water pumps are provided on the circulating pipelines of different detection units. Preferably, multiple detection units are arranged in parallel; preferably, an input main pipe is provided at the bottom of the water tank, and the input pipes of multiple detection units are connected to the input main pipe.

[0012] In the above-mentioned water pump noise detection device, the closed system is provided with a pressure sensor for detecting the system pressure; preferably, the pressure sensor is arranged on the input pipe. The pressure sensor is connected to an external display device for analyzing and displaying pressure readings, and the external display device is arranged outside the soundproof room.

[0013] In the above-mentioned water pump noise detection device, a heating device is arranged in the water tank, and the closed system is provided with a temperature sensor for detecting the system water temperature; preferably, the heating device uses an electric heating tube; preferably, the temperature sensor is connected to an external display device for analyzing and displaying temperature readings, and the external display device is arranged outside the soundproof room.

[0014] In the above-mentioned water pump noise detection device, the external display device can be electrically connected or wirelessly connected.

[0015] The present invention also provides a water pump noise detection method. The detection method uses the above-mentioned water pump noise detection device to detect the water pump noise, including the following steps:

[0016] 1. Fix the water pump to be detected to the circulating pipeline, place the noise sensor according to the position of the water pump to be detected, close the door of the soundproof room, start the motor of the water pump to be detected, observe the display value of the noise sensor, and record the noise value after it stabilizes.

[0017] 2. Pressurize the closed system through a pressurizing device, start the motor of the water pump to be detected again, observe the display value of the noise sensor, and record the noise value after it stabilizes.

[0018] III. Continue to pressurize the closed system through the pressurizing device, restart the motor of the water pump to be detected, observe the display value of the noise sensor, and record the noise value after it stabilizes;

[0019] IV. Repeat step III until the minimum noise appears;

[0020] V. Record the minimum noise as the noise detected for the water pump.

[0021] In the above method for detecting the noise of a water pump, further, in step II, the pressure for pressurizing the closed system through the pressurizing device is 0.10 MPa. In steps III and IV, the pressure for pressurizing the closed system through the pressurizing device increases with a pressure difference of 0.05 MPa. Specifically, the pressurizing pressures in steps III and IV are 0.15 MPa, 0.2 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa...

[0022] In the above method for detecting the noise of a water pump, before detecting the water pump noise, heat the water in the water tank to the temperature corresponding to the operating conditions of the water pump to be detected, and maintain this operating condition temperature throughout the detection process. For example, if the temperature of the operating conditions of the water pump to be detected is 90 °C, then heat it to and maintain at 90 °C. Further, in step II, the pressure for pressurizing the closed system through the pressurizing device is 0.10 MPa. In step III, the pressure for pressurizing the closed system through the pressurizing device increases with a pressure difference of 0.05 MPa. Specifically, the pressurizing pressures in steps III and IV are 0.15 MPa, 0.2 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa...

[0023] The principle of the present invention is that by pressurizing the entire system, the occurrence of cavitation can be effectively inhibited, thereby eliminating the influence of cavitation noise on the detection results. After pressurization, the inlet pressure is higher than the saturated vapor pressure, bubbles cannot form, and the physical root cause of cavitation noise generated by the rupture of bubbles is eliminated. The detection equipment no longer collects the signals generated by cavitation noise. After the cavitation noise disappears, the detection system only collects the inherent noise of mechanical components, avoiding misjudging cavitation noise as a mechanical failure and preventing cavitation from masking real mechanical defects.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a water pump noise detection device. By setting up a closed system and pressurizing the system, the interference of cavitation noise on the water pump noise detection is offset, making the detection result more accurate. Further, based on the above detection device, the present invention also provides a water pump noise detection method. By the method of step-by-step pressurization, the magnitude of the pressure required to offset the cavitation noise can be accurately determined, and then the water pump noise after excluding the cavitation interference can be accurately detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of the present invention;

[0027] Figure 2 is a perspective view of the present invention (excluding the sound insulation room);

[0028] Reference numerals: 1, sound insulation room; 2, water tank; 3, circulation pipeline; 4, water pump; 5, input pipe; 6, output pipe; 7, mounting flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below with specific embodiments in conjunction with the accompanying drawings. Refer to Figure 1-2 :

[0030] Embodiment 1

[0031] Refer to the attached Figure 1 , a water pump noise detection device, including a sound insulation room 1. A noise sensor is arranged inside the sound insulation room 1. A water tank 2 is arranged outside the sound insulation room 1. The water tank 2 is connected to a water pump 4 to be detected through a circulation pipeline 3. The water tank 2, the circulation pipeline 3 and the water pump 4 form a pressurizable closed system. The water pump 4 is located inside the sound insulation room 1. The circulation pipeline 3 penetrates through the wall of the sound insulation room 1 and is hermetically connected thereto. A pressurizing device is connected to the water tank 2.

[0032] The above pressurizing device adopts a device for injecting high-pressure gas, such as an air compressor. By injecting high-pressure gas into the water tank 2, the closed system can maintain a certain system pressure.

[0033] In order to facilitate the observation and recording of noise data, the noise sensor is connected to an external display device for analyzing and displaying the noise reading. The external display device is arranged outside the sound insulation room 1.

[0034] Refer to the attached Figure 2, the circulating pipeline 3 includes an input pipe 5 and an output pipe 6. The water pump 4 is vertically arranged and the motor shaft remains horizontal. One end of the input pipe 5 is connected to the bottom of the water tank 2, and the other end is connected to the water inlet at the bottom of the water pump 4. One end of the output pipe 6 is connected to the water outlet at the top of the water pump 4, and the other end is connected to the top of the water tank 2. After starting the water pump 4, the water in the water tank 2 is circulated back into the water tank 2 through the input pipe 5, the water pump 4, and the output pipe 6 in sequence under the startup of the water pump 4.

[0035] A plurality of the above water pumps 4 and circulating pipelines 3 are provided. Each water pump 4 and its corresponding circulating pipeline 3 form a detection unit. Different detection units detect water pumps 4 of different specifications. Installation flanges 7 of different specifications adapted to their corresponding water pumps 4 are provided on the circulating pipelines 3 of different detection units. Preferably, a plurality of detection units are arranged in parallel; preferably, an input main pipe is provided at the bottom of the water tank 2, and the input pipes 5 of a plurality of detection units are connected to the input main pipe; by providing a plurality of different detection units, the detection requirements of water pumps 4 of different specifications can be satisfied simultaneously.

[0036] In order to accurately control the system pressure, a pressure sensor for detecting the system pressure is provided in the above closed system; preferably, the pressure sensor is provided on the input pipe 5, and the pressure sensor is connected to an external display device for analyzing and displaying the pressure reading, and the external display device is provided outside the sound insulation room 1.

[0037] In order to meet the noise detection requirements of the water pump 4 under actual working conditions, a heating device is provided in the water tank 2, and a temperature sensor for detecting the system water temperature is provided in the closed system; preferably, the heating device uses an electric heating tube; preferably, the temperature sensor is connected to an external display device for analyzing and displaying the temperature reading, and the external display device is provided outside the sound insulation room 1.

[0038] The above external display device can be electrically connected or wirelessly connected, such as Bluetooth connection, etc.

[0039] Embodiment 2

[0040] Water pump noise detection

[0041] I. Close the inlet valve, fixedly connect the water pump to be detected to the circulating pipeline in a predetermined manner (vertically arranged and the rotor shaft is horizontal), place the noise sensor according to the position of the water pump to be detected, place the noise sensor 1 meter away from the center of the motor and turn it on, close the door of the sound insulation room, open the inlet valve, start the motor of the water pump to be detected, the water pump starts to work, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0042] II. Pressurize the closed system through the pressurizing device until the system pressure reaches 0.1 MPa. Open the inlet valve again, start the motor of the water pump to be tested again, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0043] III. Continue to pressurize the closed system through the pressurizing device until the system pressure reaches 0.15 MPa. Open the inlet valve again, start the motor of the water pump to be tested again, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0044] IV. Repeat step III, with each pressurization value being 0.05 MPa (i.e., pressurize until the system pressure reaches 0.20 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa...) until the minimum noise appears;

[0045] V. Record the minimum noise as the noise detected for the water pump.

[0046] The following table shows the actual noise detection results of the water pump of model 40 - 16 (Zhejiang Xindi Energy Saving Technology Co., Ltd.)

[0047]

[0048]

[0049] It can be seen from the detection results that when the system pressure increases to 0.3 MPa and 0.35 MPa, the noise is the smallest, indicating that the system pressure at this time can offset the influence of cavitation noise, and the actual noise value of the water pump is 48.5 dB.

[0050] Example 3

[0051] Noise detection of the water pump under actual working conditions

[0052] I. Before detecting the noise of the water pump, heat the water in the water tank to the temperature corresponding to the working condition of the water pump to be tested, and keep this working condition temperature throughout the detection process; in this example, the temperature of the working condition of the water pump to be tested is 90 °C.

[0053] II. Close the inlet valve, fixedly connect the water pump to be tested to the circulation pipeline in a predetermined manner (vertically arranged with the rotor shaft horizontal), place the noise sensor according to the position of the water pump to be tested, place the noise sensor 1 meter away from the center of the motor and turn it on, close the door of the soundproof room, open the inlet valve, start the motor of the water pump to be tested, the water pump starts to work, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0054] III. Pressurize the closed system through the pressurizing device until the system pressure reaches 0.1 MPa. Open the inlet valve again, start the motor of the water pump to be tested again, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0055] IV. Continue to pressurize the closed system through the pressurizing device until the system pressure reaches 0.15 MPa. Open the inlet valve again, start the motor of the water pump to be tested again, observe the display value of the noise sensor, record the noise value after it stabilizes, close the inlet valve after the test is completed, and turn off the water pump motor;

[0056] V. Repeat step III, with each pressurization value being 0.05 MPa (i.e., pressurize until the system pressure reaches 0.20 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa...), until the minimum noise appears;

[0057] VI. Record the minimum noise as the noise detected for the water pump.

[0058] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A water pump noise detection device, including a sound insulation chamber (1), wherein a noise sensor is arranged in the sound insulation chamber (1), characterized in that, A water tank (2) is provided on the outer side of the soundproof room (1). The water tank (2) is connected to the water pump (4) to be tested through a circulation pipeline (3). The water tank (2), the circulation pipeline (3) and the water pump (4) form a pressurizable closed system. The water pump (4) is located inside the soundproof room (1). The circulation pipeline (3) penetrates through the wall of the soundproof room (1) and is hermetically connected thereto. A pressurizing device is connected to the water tank (2).

2. The water pump noise detection device according to claim 1, characterized in that, The circulation pipeline (3) includes an input pipe (5) and an output pipe (6). The water pump (4) is vertically arranged and the motor shaft remains in the horizontal direction. One end of the input pipe (5) is connected to the bottom of the water tank (2), and the other end is connected to the water inlet at the bottom of the water pump (4). One end of the output pipe (6) is connected to the water outlet at the top of the water pump (4), and the other end is connected to the top of the water tank (2).

3. A water pump noise detection device according to claim 2, characterized in that, A plurality of the water pumps (4) and the circulation pipelines (3) are provided. Each water pump (4) and its corresponding circulation pipeline (3) form a detection unit. Different detection units detect water pumps (4) of different specifications. Installation flanges (7) of different specifications and adapted to their corresponding water pumps (4) are provided on the circulation pipelines (3) of different detection units.

4. A water pump noise detection device according to claim 1, characterized in that, The closed system is provided with a pressure sensor for detecting the system pressure.

5. A water pump noise detection device according to claim 1, characterized in that, A heating device is provided inside the water tank (2). The closed system is provided with a temperature sensor for detecting the system water temperature.

6. A method for detecting the noise of a water pump, characterized in that, When using the water pump noise detection device described in any one of claims 1-5 to detect the water pump noise, the detection method includes the following steps:

1. Fix the water pump to be tested to the circulation pipeline, place the noise sensor according to the position of the water pump to be tested, close the door of the soundproof room, start the motor of the water pump to be tested, observe the displayed value of the noise sensor, and record the noise value after stabilization.

2. Pressurize the closed system through the pressurizing device, start the motor of the water pump to be tested again, observe the displayed value of the noise sensor, and record the noise value after stabilization.

3. Continue to pressurize the closed system through the pressurizing device, start the motor of the water pump to be tested again, observe the displayed value of the noise sensor, and record the noise value after stabilization.

4. Repeat step 3 until the minimum noise value appears.

5. Record the minimum noise value as the water pump detection noise.

7. A method for detecting the noise of a water pump according to claim 6, characterized in that, In step 2, the pressure for pressurizing the closed system through the pressurizing device is 0.10 MPa. In step 3 and step 4, the pressure for pressurizing the closed system through the pressurizing device increases with a pressure difference of 0.05 MPa.

8. A method for detecting the noise of a water pump according to claim 6, characterized in that, Before the water pump noise detection, heat the water in the water tank to the temperature corresponding to the operating condition of the water pump to be tested, and keep this operating condition temperature throughout the detection process.

9. A method for detecting the noise of a water pump according to claim 8, characterized in that, In step 2, the pressure for pressurizing the closed system through the pressurizing device is 0.10 MPa. In step 3 and step 4, the pressure for pressurizing the closed system through the pressurizing device increases with a pressure difference of 0.05 MPa.

Images