CN221803139U - Bearing temperature monitoring device and temperature monitoring system - Google Patents

Abstract

The utility model discloses a bearing temperature monitoring device and a temperature monitoring system. The monitoring system is designed based on the Curie temperature and is used for monitoring and alarming when the bearing temperature reaches or exceeds the warning temperature. The device includes a soft magnet, a permanent magnet, a substrate and a switch assembly, and is characterized in that the soft magnet is fixed on the substrate, the permanent magnet is slidably installed in the inner cavity of the substrate, the permanent magnet is a moving part, and a switch assembly is arranged between the soft magnet and the permanent magnet, and the two electrode terminals of the switch assembly are connected to the alarm circuit. The device is directly embedded in the mounting hole of the bearing, and has a better contact area with the bearing, reducing the adverse effects of cold and hot bridges. And the direct contact makes the measurement point closer to the signal source, greatly improving the measurement accuracy, and has a high practical application value.

Description

Bearing temperature monitoring device and temperature monitoring system

Technical Field

The utility model relates to the technical field of bearing temperature monitoring.

Background Art

Bearing temperature is an important parameter to control, optimize and monitor to ensure the normal operation of mechanical equipment.

Patent document US20240027285A1 discloses a bearing temperature monitoring system. The temperature monitoring system is a system based on measuring the bearing temperature at the connecting rod in a crankshaft or other piston drive system. The system has at least one temperature sensing module installed in the connecting rod bearing end cover. The temperature sensing module sends temperature data to a data management module installed outside the crankcase or other housing via radio or RFID. The temperature sensing element in this technology can be a thermocouple, a resistance temperature detector (RTD) or a thermistor, which can measure temperatures from 0°F (Fahrenheit) to 300°F. The temperature sensing element is capable of detecting the temperature of the rod bearing of the connecting rod.

Patent document CN220322710U discloses an automatic monitoring device for the health status of a bearing body, wherein a bearing health status monitor is fixedly arranged on the upper plane of the bearing body, a bearing body power supply is also fixedly arranged on the bearing body, the output end of the bearing body power supply is electrically connected to the bearing health status monitor, and the temperature monitoring mechanism includes a first temperature monitoring component and a second temperature monitoring component, and the first temperature monitoring component, the second temperature monitoring component and the vibration monitoring mechanism are all arranged on the bearing body. The utility model is convenient for monitoring the axial and radial vibration acceleration inside the bearing body, and is convenient for monitoring the temperature rise of a single bearing inside the bearing body, so as to facilitate the analysis of the operating status of the bearing body and avoid sudden damage to the bearing body and affect the operation of the device.

Patent document CN114981551B discloses a sensing device and a bearing assembly, including a sensing body for being installed into a bearing by press fitting, the sensing body being configured with: a sensing measurement module, which includes a pressure sensor for measuring the bearing load and a temperature sensor for measuring the temperature of the sensing device, wherein the measured load is corrected by means of the measured temperature; a wireless communication module, which is used to wirelessly transmit bearing information from the sensing measurement module; and a wireless power supply module, which is used to power the sensing measurement module and the wireless communication module.

According to different monitoring principles, temperature sensing elements (temperature sensors) can be divided into three categories: thermal resistors, thermocouples, and thermistors. The installation position is generally on the bearing seat or on a structure close to the bearing seat, and is connected to the monitoring circuit through a signal line, which is the temperature acquisition end.

It can be seen that the temperature monitoring system for rolling bearings generally installs the temperature sensor on the bearing seat or on a structure close to the bearing seat. The location where the bearing fault occurs is far away from the sensor installation location, and the signal is prone to energy loss of the temperature indicator during transmission. At the same time, when the temperature sensor is installed on the bearing seat, especially when collecting bearing vibration signals, the signal needs to be transmitted to the sensor through the bearing seat or other components. The signal will be attenuated during the transmission process, making it difficult for the sensor to detect early fault signals. When using vibration signals to monitor the status and diagnose faults of running mechanical equipment, there are difficulties in collecting vibration signals, large signal fluctuations, and unsatisfactory analysis results. In addition to the working information of the bearing itself, the signals collected by this method also contain noise signals generated by other moving parts in the equipment, which is very unfavorable for monitoring bearing faults.

In fact, when the bearing is working, the bearing temperature rises, and risks will only occur when the bearing temperature exceeds the warning temperature. For example, the minimum threshold of a warning temperature is 150 degrees Celsius. Therefore, in the design of a monitoring system for bearings, it is only necessary to judge the temperature above the warning temperature.

Utility Model Content

In order to solve the deficiencies of the prior art, the utility model provides a bearing temperature monitoring device and a temperature monitoring system. The monitoring system is designed based on Curie temperature and is used for monitoring and alarming when the bearing temperature reaches or exceeds the warning temperature.

The technical solution adopted by the utility model to solve its technical problems is:

A bearing temperature monitoring device includes a soft magnet, a permanent magnet, a substrate and a switch assembly, characterized in that the soft magnet is fixed on the substrate, the permanent magnet is slidably installed in the inner cavity of the substrate, the permanent magnet is the moving part, and the switch assembly is arranged between the soft magnet and the permanent magnet, and the two electrode terminals of the switch assembly are connected to the alarm circuit.

Furthermore, the switch assembly includes a moving ring, a stationary ring and a reset spring, wherein the moving ring is fixed on the permanent magnet, the stationary ring is embedded in the inner cavity of the base, and a reset spring is arranged between the moving ring and the stationary ring. When the soft magnet is in a ferromagnetic state, the soft magnet is attracted to the permanent magnet and the switch assembly is disconnected; when the soft magnet is in a paramagnetic state, the permanent magnet and the soft magnet are released and the switch assembly is closed.

Furthermore, the moving ring and the stationary ring are respectively provided with metal conductive slip rings, and a circuit path is formed when the two slip rings are in contact with each other, and a circuit is broken when the two slip rings are separated from each other.

Furthermore, the two electrode terminals are connected to the dynamic ring and the static ring respectively through metal leads or metal connecting wires or metal sheets.

Furthermore, the switch assembly includes a moving plate, a stationary plate and a return spring, wherein the moving plate is fixed on the permanent magnet, the stationary plate is fixed on the end cover and is arranged in pair with the moving plate, the return spring is installed in the central cavity of the permanent magnet, and the upper end of the return spring abuts on the soft magnet, and the lower end abuts on the moving plate. When the soft magnet is in a ferromagnetic state, the soft magnet is attracted to the permanent magnet and the switch assembly is disconnected; when the soft magnet is in a paramagnetic state, the permanent magnet and the soft magnet are released and the switch assembly is closed.

Furthermore, the base body is a barrel-shaped or cylindrical structure, and is installed in the mounting hole of the bearing by means of bonding, welding or expansion connection.

Furthermore, the substrate is one of aluminum alloy, copper alloy and engineering plastic.

Furthermore, the matrix has a partial or full covering structure for the soft magnet.

Furthermore, the alarm circuit is a wired circuit or a wireless circuit.

A bearing temperature monitoring system is characterized in that an inner ring or an outer ring of a bearing assembly is provided with a mounting hole, and the bearing temperature monitoring device is arranged in the mounting hole.

The beneficial effects of the utility model are:

The device is directly embedded in the mounting hole of the bearing, with a better contact area with the bearing, reducing the adverse effects of hot and cold bridges. Direct contact makes the measurement point closer to the signal source, greatly improving the measurement accuracy and having high practical application value.

This device uses a soft magnet as a sensor and does not need to rely on external power supply. It can work stably for a long time even in an atmosphere of humid and harmful gases.

The device uses the Curie temperature (physical property) of the soft magnet itself as the threshold setting, thus simplifying the steps of traditional sensor signal processing.

By opening a small hole in the bearing without changing the overall size of the bearing, the sensor is close to the signal source, the measured signal is close to the true value, and the measurement accuracy is high. Therefore, it is an embedded installation method.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the installation of the device in the bearing.

Figure 2 is a cross-sectional view of the installation of the device in the bearing.

Figure 3 is a schematic diagram of the bearing temperature monitoring system.

FIG. 4 is a cross-sectional view of the first embodiment (attractive state).

FIG. 5 is a cross-sectional view of the first embodiment (released state).

FIG. 6 is a cross-sectional view of the second embodiment (attractive state).

FIG. 7 is a cross-sectional view of the second embodiment (released state).

FIG. 8 is a structural diagram of the switch assembly in the first embodiment.

FIG. 9 is an overall view of the first embodiment.

FIG. 10 is an overall view of the second embodiment.

FIG. 11 is a cross-sectional view of the third embodiment (attractive state).

FIG. 12 is a cross-sectional view of the third embodiment (released state).

FIG. 13 is a first installation method of the device.

FIG. 14 is a second installation method of the device.

Figure 15 shows the third installation method of the device.

FIG. 16 is a fourth installation method of the device.

In the figure:

00 bearing, 01 mounting hole, 02 bearing temperature monitoring device,

10 soft magnets,

20 permanent magnets,

30 base,

40 switch assembly, 41 moving ring, 42 static ring, 43 return spring, 44 conductive slip ring, 41' moving plate, 42' static plate, 45 V-shaped metal sheet,

50 end cap, 51 electrode terminal.

DETAILED DESCRIPTION

Curie temperature is also called Curie point or magnetic transition point. It refers to the temperature at which the spontaneous magnetization intensity in a magnetic material drops to zero. It is the critical point at which ferromagnetic or ferrimagnetic materials transform into paramagnetic materials. When the temperature is lower than the Curie point, the material becomes a ferromagnet, and the magnetic field associated with the material is difficult to change. When the temperature is higher than the Curie point, the material becomes a paramagnet, and the magnetic field of the magnet can easily change with the change of the surrounding magnetic field.

In more popular terms, the magnetization intensity of ferromagnetic materials decreases as the temperature increases. When a certain temperature is reached, the spontaneous magnetization disappears and turns into paramagnetism. This critical temperature is the Curie temperature, which determines the upper limit temperature of the operation of magnetic devices.

Referring to Figures 1 to 3, the bearing temperature monitoring device 02 can be a cylindrical or round pin-shaped integral structure, which is directly installed on the bearing. During installation, by drilling a hole on the inner ring or outer ring of the bearing 00 to form a mounting hole 01, the device can be quickly fixed on the inner ring or outer ring of the bearing by embedding, pressing or screwing. The drilling position on the outer ring or inner ring can be determined according to the actual working state and installation needs of the bearing. Generally speaking, the outer ring of the bearing is a stationary part used to install the device. In special structures, sometimes the inner ring of the bearing is a stationary part, such as a rotary kiln bearing, in which case the device is fixed in the inner ring. Therefore, the device is preferentially installed in the stationary ring of the bearing assembly, and this structure is conducive to the lead-out of the signal line and connecting it to the alarm circuit (wired circuit). Of course, if a wireless transmission module is integrated in the device, there is no need to consider the lead-out problem of the signal line, and the device can be arbitrarily installed on the inner ring or outer ring, which is possible.

Taking the diagram as an example, the device preferably has a cylindrical structure, including a soft magnet 10, a permanent magnet 20, a substrate 30 and a switch assembly 40, wherein the substrate 30 is a barrel-shaped or cylindrical structure, which can facilitate the implementation of installation. Specifically, quick installation can be achieved by drilling holes on the inner ring or outer ring of the bearing. The soft magnet 10 is fixed on the substrate 30, that is, the two are fixedly installed, and the fixing method can be an adhesive connection, a welding connection or an expansion connection. Furthermore, the soft magnet is preferably a cylindrical structure, which is the same diameter as the above-mentioned substrate or slightly smaller, and constitutes a cylinder as a whole.

The substrate 30 in this embodiment can be non-ferromagnetic materials such as aluminum alloy, copper alloy, engineering plastics, etc. The physical property of such non-ferromagnetic materials is that they will not be ferromagnetic in a magnetic field and can be quickly installed in the mounting hole of the bearing.

Embodiment 1

Referring to Figures 4 and 5, in this scheme, the base 30 is a cylindrical structure, and the base in this structure is preferably an aluminum alloy or a copper alloy, which has good thermal conductivity, so as to facilitate thermal conductivity with the soft magnet inside. In this scheme, the soft magnet 10 is installed inside the base. The permanent magnet corresponding to the soft magnet is also cylindrical, and the permanent magnet is also installed in the inner cavity of the base. The permanent magnet is a movable part, and the soft magnet is a static part, which is relative to the base. The switch assembly 40 is arranged between the soft magnet and the permanent magnet. The so-called switch assembly in this embodiment includes a moving ring 41, a static ring 42 and a reset spring 43, wherein the moving ring is fixed on the permanent magnet and forms an integral structure. The static ring is embedded in the inner cavity of the base and fixed to form an integral structure. In this structure, the moving ring has a space for sliding along the axial direction relative to the static ring, and a reset spring 43 is arranged between the moving ring and the static ring. The function of the reset spring is that when the soft magnet is in the ferromagnetic state, the soft magnet and the permanent magnet are attracted, and in this state, the reset spring is in a compressed state. When the temperature of the soft magnet exceeds the Curie temperature, the soft magnet is in a paramagnetic state, the permanent magnet and the soft magnet are no longer attracted, and under the action of the reset spring, the permanent magnet and the moving ring slip in the axial direction. A metal conductive slip ring 44 is respectively provided on the moving ring 41 and the static ring 42. When the two slip rings contact each other, a circuit path is formed. In this corresponding state, the permanent magnet and the soft magnet are separated. When the two slip rings are separated from each other, a circuit is formed. In this corresponding state, the permanent magnet and the soft magnet are in an attracted state. An end cover is fixed on the outer substrate of the permanent magnet for packaging. The end cover is made of a non-metallic body, such as engineering plastics, and two electrode terminals 51 are provided on the end cover 50. The two electrode terminals are connected to the moving ring and the static ring respectively through metal leads or metal connecting wires. The two electrode terminals are connected to the alarm circuit outwardly, and provide signals to the alarm circuit when the switch assembly is closed.

The device can be packaged to form a sensor.

Furthermore, a wireless transmission module is added to the sensor. By adding the wireless transmission module, wireless transmission can be realized. This transmission technology is a mature technology and will not be described in detail.

Embodiment 2

Referring to Figures 6 and 7, the difference between this embodiment and the above embodiment is that the base 30 is a cylindrical structure, and the soft magnet is fixed at one end of the base, that is, the base has no covering effect on the soft magnet 10. This structure allows the soft magnet to fit directly with the mounting hole in the bearing assembly, and with the assistance of thermal conductive silicone oil, direct heat conduction between the soft magnet and the bearing is achieved. Under this structure, the loss of heat during the transfer process can be avoided, and the perception of the soft magnet to the bearing temperature can be further improved, and the sensitivity can be improved.

FIG9 and FIG10 correspond to the stereoscopic views of the bearing temperature monitoring device in the first embodiment and the second embodiment respectively.

FIG8 shows the combined state of the moving ring, the stationary ring and the return spring.

Embodiment 3

Referring to Figures 11 and 12, the difference between this embodiment and the second embodiment is the difference in the switch assembly. Specifically, the switch assembly 40 includes a moving plate 41', a static plate 42' and a reset spring 43, wherein the moving plate 41' is fixed on the permanent magnet and forms an integral structure, and the corresponding permanent magnet is annular and has a reset spring mounting cavity. The static plate 42' is fixed on the end cover 50 and is arranged in pair with the moving plate. In this structure, the moving plate has a separation and fitting action relative to the static plate. The reset spring is installed in the above-mentioned mounting cavity, and the upper end of the reset spring abuts on the soft magnet, and the lower end abuts on the moving plate. The function of the reset spring is that when the soft magnet is in a ferromagnetic state, the soft magnet and the permanent magnet are attracted, and in this state, the reset spring is in a compressed state. When the temperature of the soft magnet exceeds the Curie temperature, the soft magnet is in a paramagnetic state, and the permanent magnet and the soft magnet are no longer attracted. Under the action of the reset spring, the permanent magnet and the moving ring move axially. The moving plate and the static plate are connected to two electrode terminals on the end cap through metal wires, and the two electrode terminals are connected to the alarm circuit, and provide signals to the alarm circuit when the switch assembly is closed. Furthermore, the lead wire of the moving plate is made of a V-shaped metal sheet 45 to meet the requirements of elastic deformation.

In order to further increase the conductivity, the contact point between the moving plate and the stationary plate is designed to be in a raised state.

FIG. 13 to FIG. 16 schematically show four specific installation states.

A bearing temperature wireless monitoring system, which uses wireless communication technology to output signals. Specifically, a wireless transmission module and a power module are added to the above device, wherein the power module is a power supply unit, and the wireless transmission module outputs signals. Correspondingly, an external unit includes an alarm circuit, a wireless receiving module and a power module. The wireless receiving module receives the signal from the wireless transmission module and activates the alarm circuit to generate an alarm signal, which can be an acoustic, optical and electrical signal.

A bearing temperature online monitoring system, in which a bearing temperature monitoring device is directly connected to an alarm circuit to provide an alarm signal to the alarm circuit.

After the implementation of this technology, early faults can be discovered in time, avoiding major equipment failures and safety accidents caused by bearing damage.

Furthermore, the above-mentioned mounting holes are pre-filled with filling materials such as thermally conductive silicone oil and thermally conductive graphite powder to reduce the thermal bridge loss caused by the gap in the mounting holes.

The alarm principle of this technology is: when the bearing assembly is working, the bearing temperature rises, and the temperature of the bearing itself will be transferred to the soft magnet through thermal conductive silicone oil or thermal conductive graphite. For example, the bearing assembly temperature is about 80℃ to 150℃, which is prone to failure, so choose a soft magnet with a suitable Curie temperature material. When the soft magnet reaches the Curie temperature, it will lose its magnetism, and the switch component will close the alarm circuit and trigger the sound and light alarm. At this time, it also means that the bearing temperature has reached a dangerous temperature for failure, and it is necessary to stop working in time to prevent further wear and tear of the bearing.

In this embodiment, a cylindrical structure is given as an example only. In fact, within a foreseeable range, the device can be made into any shape.

The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the protection scope determined by the claims of the present invention.

Claims (10)

1. The utility model provides a bearing temperature monitoring device, includes soft magnet, permanent magnet, base member and switch module, its characterized in that, soft magnet is fixed on the base member, permanent magnet slidable mounting is in the base member inner chamber, and this permanent magnet is movable part, sets up switch module between soft magnet and permanent magnet, and the two electrode terminals of switch module are connected to alarm circuit.

2. The device for monitoring the temperature of a bearing according to claim 1, wherein the switch assembly comprises a moving ring, a stationary ring and a return spring, wherein the moving ring is fixed on a permanent magnet, the stationary ring is embedded in an inner cavity of the base body, the return spring is arranged between the moving ring and the stationary ring, the soft magnet is attracted with the permanent magnet in a ferromagnetic state, and the switch assembly is disconnected; in the paramagnetic state of the soft magnet, the permanent magnet and the soft magnet are released, and the switch assembly is closed.

3. The bearing temperature monitoring device according to claim 2, wherein the movable ring and the stationary ring are respectively provided with a metal conductive slip ring, the two slip rings form a circuit path when contacting each other, and form an open circuit when separating from each other.

4. A bearing temperature monitoring device according to claim 3, wherein the two electrode terminals are connected to the moving ring and the stationary ring by metal leads or metal connecting wires, metal sheets, respectively.

5. The device for monitoring the temperature of the bearing according to claim 1, wherein the switch assembly comprises a movable plate, a static plate and a return spring, the movable plate is fixed on the permanent magnet, the static plate is fixed on the end cover and is arranged in a matched mode with the movable plate, the return spring is arranged in a central cavity of the permanent magnet, the upper end of the return spring is abutted against the soft magnet, the lower end of the return spring is abutted against the soft magnet on the movable plate, the soft magnet is attracted with the permanent magnet in a ferromagnetic state, and the switch assembly is disconnected; in the paramagnetic state of the soft magnet, the permanent magnet and the soft magnet are released, and the switch assembly is closed.

6. A bearing temperature monitoring device according to claim 1, wherein the base body is of a cylindrical or drum-like structure and is mounted in the mounting hole of the bearing by means of an adhesive, welded or expansion connection.

7. The bearing temperature monitoring device of claim 1, wherein the substrate is one of an aluminum alloy, a copper alloy, and an engineering plastic.

8. A bearing temperature monitoring device according to claim 1, wherein the substrate has a partial or full cladding structure to the soft magnetic iron.

9. The bearing temperature monitoring device of claim 1, wherein the alarm circuit is one of a wired circuit or a wireless circuit.

10. A bearing temperature monitoring system characterized in that a mounting hole is provided in an inner ring or an outer ring of a bearing assembly, and a bearing temperature monitoring device according to any one of claims 1 to 9 is disposed in the mounting hole.