High-temperature direct-drive vibration measuring device for shielded electric pumps
By installing high-temperature resistant vibration temperature sensing elements and heat sinks on the high-temperature contact surface of the shielded electric pump, and combining them with a high-precision vibration transmission and processing unit, the problems of signal distortion and resonance in vibration measurement at high temperatures are solved, enabling accurate vibration monitoring and fault diagnosis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 大连帝国屏蔽电泵有限公司
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-02
AI Technical Summary
The vibration measurement accuracy of traditional shielded electric pumps is affected by thermal drift at high temperatures, and the measurement method with metal extension section leads to signal distortion and resonance risk, making it impossible to accurately determine the fault.
It adopts a combination of high-temperature resistant vibration temperature sensing element, heat-insulating mica layer and heat sink, and is directly installed on the high-temperature contact surface of the shielded electric pump. Combined with a high-precision vibration transmission and processing unit, it can collect and analyze vibration data in real time, eliminating the metal extension section and avoiding signal distortion and resonance.
It enables accurate vibration measurement of shielded electric pumps under high temperature conditions, improves measurement accuracy and reliability, avoids false alarms, meets explosion-proof requirements, and expands the application range.
Smart Images
Figure CN224317148U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of shielded electric pumps, specifically to a high-temperature resistant direct-connection vibration measuring device for shielded electric pumps. Background Technology
[0002] A canned motor pump is a seal-less pump, in which the canned motor and the pump form an integral structure. The inner surface of the motor stator and the outer surface of the rotor are sealed and welded with non-magnetic metal shielding sleeves, completely isolating the stator windings and rotor core from the conveying medium. The impeller and rotor are mounted on a shaft and supported by two bearings. The conveying medium flows through the gap between the stator shielding sleeve and the rotor shielding sleeve. The entire motor is housed in a metal casing, and the surface temperature of the motor is very high. Moreover, the condition of the internal components cannot be directly observed from the outside. Therefore, vibration measurement is a very important means of diagnosing canned motor pump malfunctions.
[0003] Traditional vibration measurement of shielded electric pumps suffers from significant thermal drift at high temperatures, affecting measurement accuracy. Therefore, it cannot directly measure vibrations on high-temperature surfaces. Instead, it can only be measured indirectly by adding a metal extension section to extend the vibration measurement location. The vibration signal is installed at the end of the metal extension section, which has a certain spatial difference from the actual vibration source location of the shielded electric pump. This can lead to superposition or reflection interference of vibration signals, thereby increasing the vibration amplitude and causing it to deviate from the actual vibration value. Furthermore, the metal extension section itself has certain mechanical characteristics, and its natural frequency may be close to the vibration frequency of the shielded electric pump, which may create a resonance risk and cause the vibration signal amplitude to increase significantly. This signal distortion often results in false alarms at the user's site. Utility Model Content
[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a high-temperature resistant direct-connection vibration measuring device for shielded electric pumps.
[0005] The technical solution adopted by this utility model to achieve the above objectives is as follows:
[0006] A high-temperature resistant direct-connection vibration measurement device for a shielded electric pump includes a vibration temperature sensing element. The vibration temperature sensing element is installed on the high-temperature contact surface of the shielded electric pump, and a heat-insulating mica layer and a heat sink are installed between the two. The vibration temperature sensing element is connected to a vibration transmission and processing unit.
[0007] The vibration transmission processing unit includes a vibration signal processing circuit, a temperature signal processing circuit, a vibration signal temperature compensation circuit, and a vibration transmission circuit. The vibration signal of the vibration temperature sensing element is input to the vibration signal processing circuit, and the temperature signal of the vibration temperature sensing element is input to the temperature signal processing circuit. Both the vibration signal processing circuit and the temperature signal processing circuit are connected to the vibration transmission circuit through the vibration signal temperature compensation circuit.
[0008] The vibration transmitter processing unit is installed inside an explosion-proof junction box.
[0009] The vibration temperature sensing element is connected to the vibration transmission and processing unit via a connecting cable.
[0010] The features of this invention are as follows: The vibration temperature sensing element, after being enhanced with a heat-insulating mica layer and heat sink, can withstand temperatures above 400℃, making it suitable for direct installation on the high-temperature contact surface of the canned motor pump. This eliminates the need for an external metal extension section, avoiding vibration signal distortion caused by mechanical resonance and measurement position deviation. Equipped with a high-precision vibration temperature sensing element and an intelligent vibration transmission and processing unit, it can collect vibration data in real time. Combined with temperature monitoring, advanced algorithms are used for analysis and diagnosis, enabling accurate measurement of the actual vibration state of the canned motor pump. This results in higher precision and stronger reliability, allowing for comprehensive monitoring of the pump's operating status, timely detection of potential faults, and prevention of false alarms. Furthermore, the entire vibration transmission and processing unit is installed in an explosion-proof junction box, meeting on-site explosion-proof requirements and expanding the application range of the vibration transmission and processing unit in canned motor pumps. Attached Figure Description
[0011] Figure 1 This is a structural schematic diagram of the present invention.
[0012] Figure 2 This is a block diagram of the internal circuit of the vibration transmitter circuit of this utility model.
[0013] The components include: 1. Shielded electric pump; 2. High-temperature contact surface; 3. Vibration temperature sensing element; 4. Thermal insulation mica layer; 5. Heat sink; 6. Connecting cable; 7. Explosion-proof connection box; 8. Vibration transmission and processing unit; 81. Vibration signal processing circuit; 82. Temperature signal processing circuit; 83. Vibration signal temperature compensation circuit; 84. Vibration transmission circuit. Detailed Implementation
[0014] like Figure 1 , 2As shown, this utility model is a high-temperature resistant direct-connection vibration measurement device for a shielded electric pump. It includes a vibration temperature sensing element 3 employing high-temperature resistance technology. The vibration temperature sensing element 3 is directly installed on the high-temperature contact surface 2 of the shielded electric pump 1. A heat-insulating mica layer 4 and an annular heat sink 5 are installed between them. The high-temperature resistant vibration temperature sensing element 3, after adding the heat-insulating mica layer 4 and heat sink 5, can withstand temperatures above 400℃. It is suitable for direct installation on the high-temperature contact surface 2 of the shielded electric pump 1, eliminating the need for an external metal extension section and avoiding vibration signal distortion caused by mechanical structure resonance and measurement position deviation. The vibration temperature sensing element 3 is connected to a vibration transmission and processing unit 8 installed in an explosion-proof junction box 7 via an anti-interference connecting cable 6. The entire vibration transmission and processing unit 8 is installed in the explosion-proof junction box 7, meeting the explosion-proof requirements on site and expanding the application range of the vibration transmission and processing unit 8 on the shielded electric pump 1. The vibration transmission and processing unit 8 includes a vibration signal processing circuit 81, a temperature signal processing circuit 82, a vibration signal temperature compensation circuit 83, and a vibration transmission circuit. 84. The vibration signal of the vibration temperature sensing element 3 is input to the vibration signal processing circuit 81, and the temperature signal of the vibration temperature sensing element 3 is input to the temperature signal processing circuit 82. Both the vibration signal processing circuit 81 and the temperature signal processing circuit 82 are connected to the vibration transmitter circuit 84 through the vibration signal temperature compensation circuit 83. After the vibration signal processing circuit 81 and the temperature signal processing circuit 82 perform synchronous processing such as pre-amplification and filtering on the vibration signal and temperature signal input from the vibration temperature sensing element 3, the vibration signal temperature compensation circuit 83 analyzes, compensates, and corrects the signal, and then the vibration transmitter circuit 84 outputs a two-wire 4-20mA DC signal superimposed with the HART communication protocol. Through the high-precision vibration temperature sensing element 3 and the intelligent vibration transmitter processing unit 8, vibration data can be collected in real time. Combined with the temperature monitoring function, the data can be analyzed and diagnosed through advanced algorithms. The actual vibration state of the shielded electric pump 1 can be accurately measured with higher precision and stronger reliability. This enables comprehensive monitoring of the operating status of the shielded electric pump 1, timely detection of potential faults, and avoidance of false alarms during use.
[0015] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A high-temperature resistant direct-drive vibration measuring device for shielded electric pumps, characterized in that: It includes a vibration temperature sensing element, which is installed on the high-temperature contact surface of the shielded electric pump. A heat-insulating mica layer and a heat sink are installed between the two. The vibration temperature sensing element is connected to the vibration transmission and processing unit.
2. The high-temperature resistant direct-drive vibration measuring device for shielded electric pumps as described in claim 1, characterized in that: The vibration transmission processing unit includes a vibration signal processing circuit, a temperature signal processing circuit, a vibration signal temperature compensation circuit, and a vibration transmission circuit. The vibration signal of the vibration temperature sensing element is input to the vibration signal processing circuit, and the temperature signal of the vibration temperature sensing element is input to the temperature signal processing circuit. Both the vibration signal processing circuit and the temperature signal processing circuit are connected to the vibration transmission circuit through the vibration signal temperature compensation circuit.
3. The high-temperature resistant direct-drive vibration measuring device for shielded electric pumps as described in claim 1 or 2, characterized in that: The vibration transmitter processing unit is installed inside an explosion-proof junction box.
4. The high-temperature resistant direct-drive vibration measuring device for shielded electric pumps as described in claim 1 or 2, characterized in that: The vibration temperature sensing element is connected to the vibration transmission and processing unit via a connecting cable.