Vacuum adsorption vibration sensor

Abstract

The invention relates to a vacuum adsorption vibration sensor, and relates to the technical field of vibration sensors, the vibration sensor comprises a vacuum generation unit, a vacuum adsorption unit and a sensor unit, hard fixing forms such as fixing screws or glue are not needed, and the vacuum adsorption unit generates negative pressure with adsorption force under the vacuum generation unit; the vacuum adsorption unit adsorbs and fixes the vibration load, the vacuum adsorption unit can adsorb vibration load surfaces of various geometrical shapes and materials, installation and disassembly are more convenient and faster, the installation flexibility is improved, meanwhile, the problem of looseness or freedom degree between the sensor unit and the vibration load is reduced in a vacuum adsorption mode, and the reliability of the sensor unit is improved. The measurement precision is high.

Description

Technical Field

[0001] The present application relates to the technical field of vibration sensors, and in particular to a vacuum adsorption vibration sensor. Background Art

[0002] A vibration sensor is a sensor that can measure acceleration caused by vibration and is widely used in vending machines, game consoles, hard drive impact protection, automotive safety, aerospace and other fields.

[0003] The main installation methods of contact vibration sensors include probe, magnetic base, adhesive installation, screw installation and so on.

[0004] In the above-mentioned prior arts, the probes are mostly handheld and have low measurement accuracy; the magnetic base is limited to ferromagnetic materials; adhesive installation is suitable for long-term fixed test scenarios because the sensor is difficult to disassemble and the object to be measured is not frequently replaced; screw installation requires threaded holes on the sample, and disassembly and installation are also more troublesome. Summary of the invention

[0005] Based on this, it is necessary to provide a vacuum adsorption vibration sensor to address the above technical problems. It does not require hard fixing forms such as screws or stickers, but is fixed by vacuum adsorption. It can adsorb the surfaces of vibration loads of various geometric shapes, making installation and disassembly more convenient and quick, and improving the flexibility of installation. The looseness or degree of freedom between the sensor and the vibration load is reduced by vacuum adsorption, and the measurement accuracy is high.

[0006] The present invention provides a vacuum adsorption vibration sensor, which includes a vacuum generating unit, a vacuum adsorption unit and a sensor unit. The vacuum generating unit is used to provide vacuum negative pressure. The vacuum adsorption unit is connected to the vacuum generating unit. Under the control of the vacuum generating unit, the vacuum adsorption unit has an adsorption state and a release state. When in the adsorption state, the vacuum adsorption unit can adsorb the vibration load, and when in the release state, the vacuum adsorption unit can release the vibration load. The sensor unit is installed on the vacuum adsorption unit or the vacuum generating unit. When in the adsorption state, the sensor unit is used to detect the real-time parameters of the vibration load. There is no need for a hard fixing form such as a fixing screw or a sticker. Instead, under the vacuum generating unit, the vacuum adsorption unit generates negative pressure with adsorption force. The vacuum adsorption unit adsorbs and fixes the vibration load. The vacuum adsorption unit can adsorb the vibration load surface of various geometric shapes and materials. The installation and disassembly are more convenient and quick, and the flexibility of the installation is improved. The looseness or degree of freedom between the sensor and the vibration load is reduced by the vacuum adsorption method, and the measurement accuracy is high.

[0007] In one embodiment, the vacuum generating unit includes an air delivery chamber, a jet chamber, a swirl chamber, and an exhaust chamber which are connected in sequence. The swirl chamber is connected to the vacuum adsorption unit. The air delivery chamber is used to pass compressed gas of preset pressure. The compressed air is ejected through the jet chamber and forms a high-speed cyclone, so that the gas pressure in the jet chamber is less than the gas pressure in the swirl chamber and the vacuum adsorption unit, so that the swirl chamber and the vacuum adsorption unit both generate negative pressure, and the compressed air is discharged into the atmosphere from the exhaust chamber. Based on the Bernoulli principle, the greater the flow rate, the lower the air pressure, the pressure of the compressed gas ejected from the jet chamber decreases, and the gas pressure of the jet chamber is less than the gas pressure in the swirl chamber and the vacuum adsorption unit. There is a pressure difference between the swirl chamber and the jet chamber and the vacuum adsorption unit, so the gas in the swirl chamber and the vacuum adsorption unit is continuously evacuated, so that the swirl chamber and the vacuum adsorption unit both generate negative pressure, and the compressed air is discharged into the atmosphere from the exhaust chamber.

[0008] In one embodiment, the vacuum generating unit further comprises a flow stabilizing chamber, the two sides of which are respectively connected to the gas delivery chamber and the jet chamber. The function of the flow stabilizing chamber is to stabilize the compressed gas pressure and eliminate the air flow pulsation of each chamber in the entire vacuum generating unit.

[0009] In one embodiment, the diameter of the jet cavity along the conveying direction of the compressed gas first decreases and then increases. The jet cavity with increasing diameter is equivalent to a nozzle, and the flow rate of the compressed gas is accelerated due to the increase in the diameter of the jet cavity. The flow rate of the compressed gas ejected from the jet cavity with increasing diameter increases, thereby forming a high-speed jet to meet the working requirements.

[0010] In one embodiment, the vacuum generating unit includes a vacuum pipe, one side of the vacuum pipe is connected through a negative pressure element and the negative pressure element provides vacuum negative pressure to the vacuum pipe, and the other side is connected to the vacuum adsorption unit to generate negative pressure in the vacuum adsorption unit. The split external sensor body does not integrate a vacuum generator, and the negative pressure is provided by an external vacuum circuit. There is no large amount of high-speed airflow to cause vibration, and the measurement accuracy is relatively high.

[0011] In one embodiment, the vacuum adsorption unit includes a vacuum suction cup and an adsorption hole arranged through the vacuum suction cup, and one side of the adsorption hole is connected to the vacuum generating unit. The adsorption hole is connected to the cyclone chamber, reducing the adsorption volume of the cyclone chamber, ensuring a small surface leakage of the cyclone chamber, and achieving a better adsorption effect.

[0012] In one embodiment, the real-time parameters include vibration parameters of the vibration load, or include vibration parameters and temperature parameters of the vibration load. The vibration parameters include parameters such as speed, acceleration, vibration amplitude, etc. of the vibration load, and the working state of the vibration load is determined by the above parameters.

[0013] In one embodiment, the sensor unit includes at least one of a temperature-vibration composite sensor and a vibration sensor. The sensor can be installed by selecting a suitable sensor according to the vibration characteristics of the vibration load, which has flexibility and diversity and can meet the needs of different users.

[0014] In one embodiment, the temperature-vibration composite sensor includes a thermally conductive strip, one end of which passes through a vacuum adsorption unit and is connected to the interior of the temperature-vibration composite sensor, and the other end of which contacts the vibration load. The temperature-vibration composite sensor is used to detect vibration parameters and temperature parameters of the vibration load. The hot end of the thermally conductive strip contacts the vibration load, which can achieve high-sensitivity temperature measurement without interfering with the vibration signal. At the same time, the thermally conductive strip is a passive electronic device that does not sense through current or voltage, so it can avoid the influence of electromagnetic interference. The vibration parameters and temperature parameters are measured simultaneously by the temperature-vibration composite sensor without using two separate sensors, thereby improving measurement efficiency and reducing costs.

[0015] In one embodiment, the sensor unit includes a sensitive element and an amplifying circuit arranged on the vacuum adsorption unit. The sensor unit and the vacuum adsorption unit are integrated into one body, and no external sensor is required. The sensor unit can be conveniently installed or fixed on the object to be measured, thereby improving the stability and versatility of the sensor unit.

[0016] The technical effects of the present invention are:

[0017] First, there is no need for hard fixing forms such as screws or stickers, but it is fixed by vacuum adsorption. It can adsorb the surfaces of vibration loads of various geometric shapes, making installation and disassembly more convenient and quick, improving the flexibility of installation, and reducing the looseness or degree of freedom between the sensor and the vibration load through vacuum adsorption, with high measurement accuracy.

[0018] Second, through four types of vibration sensor types, according to different application scenarios and vibration characteristics of vibration loads, choose the appropriate sensor or vacuum generating unit, which has flexibility and diversity to meet the needs of different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of a split-type built-in sensor in one embodiment.

[0020] Figure 2 for Figure 1 Schematic cross-section of .

[0021] Figure 3 It is a three-dimensional diagram of a split external sensor in one embodiment.

[0022] Figure 4 for Figure 3Schematic cross-section of .

[0023] Figure 5 FIG. 4 is a three-dimensional diagram of an integrated built-in sensor in one embodiment.

[0024] Figure 6 for Figure 5 Schematic cross-section of .

[0025] Figure 7 It is a three-dimensional diagram of an integrated external sensor in one embodiment.

[0026] Figure 8 for Figure 7 Schematic cross-section of .

[0027] Description of the accompanying drawings: 100-a, split-type built-in sensor; 100-b, split-type external sensor; 100-c, integrated built-in sensor; 100-d, integrated external sensor; 10, vacuum generating unit; 11, air delivery chamber; 12, steady flow chamber; 13, jet chamber; 14, swirl chamber; 15, exhaust chamber; 20, vacuum adsorption unit; 21, vacuum suction cup; 22, adsorption hole; 30, sensor unit; 31, thermal conductive strip; 32, circuit board; X, conveying direction. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two units or the interaction relationship between two units, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if a unit is referred to as being "fixed to" or "disposed on" another unit, it may be directly on the other unit or there may be a central unit. If a unit is considered to be "connected to" another unit, it may be directly connected to the other unit or there may be a central unit at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] See also Figure 1 , Figure 2, shows a schematic diagram of a vacuum adsorption vibration sensor in an embodiment of the present application. The vibration sensor is a split built-in sensor 100-a. The vibration sensor includes a vacuum generating unit 10, a vacuum adsorption unit 20 and a sensor unit 30. The vacuum generating unit 10 is used to provide vacuum negative pressure. The vacuum generating unit 10 is connected to the vacuum adsorption unit 20. Under the control of the vacuum generating unit 10, the vacuum adsorption unit 20 has an adsorption state and a release state. When in the adsorption state, the vacuum adsorption unit 20 can adsorb a vibration load (not shown). When in the release state, the vacuum adsorption unit 20 can release the vibration load. The sensor unit 30 is installed on the vacuum generating unit 10 or the vacuum adsorption unit 20. When in the adsorption state, the sensor unit 30 is used to detect real-time parameters of the vibration load. The present embodiment does not require rigid fixing forms such as fixing screws or adhesive stickers. Instead, under the vacuum generating unit 10, the vacuum adsorption unit 20 generates negative pressure with adsorption force, and the vacuum adsorption unit 20 adsorbs and fixes the vibration load. The vacuum adsorption unit 20 can adsorb vibration load surfaces of various geometric shapes and materials, making installation and disassembly more convenient and quick, thereby improving the flexibility of installation. At the same time, the looseness or degree of freedom between the sensor unit 30 and the vibration load is reduced through vacuum adsorption, and the measurement accuracy is high.

[0035] The vibration load may be a device that generates vibration, such as a motor, a pump, a fan, a gear box, etc. It may also be a vibrating object such as a wheel, a brake, an engine, or other vibrating equipment.

[0036] In this embodiment, specifically, the vacuum generating unit 10 includes an air delivery chamber 11, a steady flow chamber 12, a jet chamber 13, a swirl chamber 14 and an exhaust chamber 15 which are connected in sequence; the vacuum adsorption unit 20 includes a vacuum suction cup 21 and an adsorption hole 22 which is arranged through the vacuum suction cup 21, and one side of the adsorption hole 22 is connected to the swirl chamber 14.

[0037] The above-mentioned air delivery cavity 11 is used to pass compressed gas of preset pressure, and the preset pressure is generally 0.4-0.5Mpa of compressed air. The function of the steady flow cavity 12 is to stabilize the compressed gas pressure and eliminate the air flow pulsation of each cavity in the entire vacuum generating unit 10. The diameter of the jet cavity 13 along the conveying direction X of the compressed gas first decreases and then increases successively. The compressed air flows from the steady flow cavity 12 into the jet cavity 13 with a decreasing diameter, and then the compressed gas flows into the jet cavity 13 with a decreasing diameter. The jet cavity 13 with a decreasing diameter is equivalent to a nozzle. The flow rate of the compressed gas is accelerated due to the increase in the diameter of the jet cavity 13. The flow rate of the compressed gas ejected from the jet cavity 13 with a decreasing diameter increases, thereby forming a high-speed jet. Based on the Bernoulli principle, the greater the flow rate, the smaller the air pressure. Therefore, the pressure of the compressed gas ejected from the jet chamber 13 decreases, and the gas pressure of the jet chamber 13 is less than the gas pressure in the swirl chamber 14 and the adsorption hole 22. There is a pressure difference between the jet chamber 13 and the swirl chamber 14 and the adsorption hole 22, and the gas in the swirl chamber 14 and the adsorption hole 22 is continuously drawn out, so that the swirl chamber 14 and the adsorption hole 22 both generate negative pressure, and the compressed air is discharged into the atmosphere from the exhaust chamber 15, so that the vacuum suction cup 21 can adsorb the vibration load. During the vibration of the vibration load, the thermal conductive strip 31 can detect the temperature parameters of the vibration load, and the internal sensitive element of the sensor can detect the vibration parameters of the vibration load, meeting the working requirements. The temperature-vibration composite sensor disclosed in this embodiment can be a thermocouple temperature sensor, a thermistor temperature sensor, or a semiconductor temperature sensor. The split built-in sensor 100-a integrates a vacuum generator and can be used as long as there is a positive pressure gas source, which greatly simplifies the vacuum circuit. This mode is simple to apply, and most industrial application scenarios have a positive pressure gas source, which is conducive to enhancing the universality of the equipment and reducing the manufacturing cost of the equipment.

[0038] like Figure 3 ,like Figure 4 As shown, in other embodiments, the vacuum adsorption vibration sensor is a split external sensor 100-b, and the corresponding vacuum generating unit 10 includes a vacuum pipe, which is connected to the above-mentioned adsorption hole 22, and the vacuum pipe is connected to the negative pressure element and provides vacuum negative pressure thereto, so as to generate negative pressure in the vacuum adsorption unit 20. The negative pressure element used in this embodiment is a vacuum pump or a vacuum generator. If a vacuum pump is used, the exhaust pipe of the vacuum pump is connected to the vacuum pipe, and the vacuum pump is started to extract the gas in the vacuum pipe and the adsorption hole 22 to meet the negative pressure requirement of the adsorption hole. The split external sensor body does not integrate a vacuum generator, and the negative pressure is provided by an external vacuum circuit. There is no large amount of high-speed airflow to cause vibration, and the measurement accuracy is relatively high.

[0039] like Figure 4As shown, the sensor units 30 in the above-mentioned split-type built-in sensor 100-a and split-type external sensor 100-b all adopt temperature-vibration composite sensors, which include a thermally conductive strip 31. One end of the thermally conductive strip 31 passes through the vacuum suction cup 21 and is connected to the inside of the temperature-vibration composite sensor, and the other end abuts against the vibration load. The temperature-vibration composite sensor is used to detect the vibration parameters and temperature parameters of the vibration load. The hot end of the thermally conductive strip 31 abuts against the vibration load, which can achieve high-sensitivity temperature measurement and will not interfere with the vibration signal. At the same time, the thermally conductive strip is a passive electronic device that does not sense through current or voltage, so it can avoid the influence of electromagnetic interference. The vibration parameters and temperature parameters are measured simultaneously by the temperature-vibration composite sensor without the need to use two separate sensors, thereby improving measurement efficiency and reducing costs.

[0040] In other embodiments, the sensor unit 30 may also adopt one of a velocity sensor and an acceleration sensor. The velocity sensor and the acceleration sensor may be divided into a piezoelectric accelerometer and a capacitive accelerometer. In a piezoelectric accelerometer, the internal microscopic crystal structure will be subjected to pressure due to the acceleration force of the vibration load. The pressure will generate an electric charge or voltage in the crystal. The front-end circuit converts the charge or voltage into a velocity or acceleration value, thereby being able to detect the velocity or acceleration value of the vibration load, which is the vibration parameter.

[0041] like Figure 5 ,like Figure 6 As shown, in other embodiments, the vacuum adsorption vibration sensor is an integrated built-in sensor 100-c. The difference between this embodiment and the split built-in sensor 100-a lies in the sensor unit 30. The vacuum adsorption unit 20 and the sensor unit 30 are integrated into one, without the need for an external sensor, and can be conveniently installed or fixed on a vibration load, thereby improving the stability and versatility of the sensor unit 30.

[0042] like Figure 7 ,like Figure 8 As shown, in other embodiments, the vacuum adsorption vibration sensor is an integrated external sensor 100-d. The difference between this embodiment and the split external sensor 100-b lies in the sensor unit 30. The sensor unit 30 of this embodiment has the same structure and function as the sensor unit 30 in the integrated built-in sensor 100-c.

[0043] The sensor unit 30 in the above-mentioned integrated built-in sensor 100-c and the integrated external sensor 100-d both adopts a temperature-vibration composite sensor, which includes a heat-conducting strip 31 and a circuit board 32 arranged on the vacuum suction cup 21. One end of the heat-conducting strip 31 is connected to the circuit board 32, and the other end is in contact with the vibration load. The circuit board 32 is provided with a sensitive element and an amplifying circuit. The sensitive element can sense the piezoelectric effect or the capacitance change part generated by the above-mentioned vibration load during vibration. The front-end amplifying circuit is to amplify, convert and transmit these weak electrical signals. The number of circuit boards disclosed in this embodiment is two, and it can also be one or more, as long as the perception, amplification and transmission of the signal are realized.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A vacuum adsorption vibration sensor, characterized in that: The vibration sensor comprises: A vacuum generating unit, used for providing vacuum negative pressure; a vacuum adsorption unit, connected to the vacuum generating unit, wherein under the control of the vacuum generating unit, the vacuum adsorption unit has an adsorption state and a release state, wherein when in the adsorption state, the vacuum adsorption unit can adsorb the vibration load, and when in the release state, the vacuum adsorption unit can release the vibration load; and The sensor unit is installed on the vacuum adsorption unit or the vacuum generating unit. When in the adsorption state, the sensor unit is used to detect the real-time parameters of the vibration load.

2. The vacuum adsorption vibration sensor according to claim 1, characterized in that: The vacuum generating unit comprises an air delivery chamber, a jet chamber, a cyclone chamber and an exhaust chamber which are connected in sequence. The cyclone chamber is connected to the vacuum adsorption unit. The air delivery chamber is used to pass compressed gas of preset pressure. The compressed air is ejected through the jet chamber and forms a high-speed cyclone, so that the gas pressure in the jet chamber is less than the gas pressure in the cyclone chamber and the vacuum adsorption unit, so that the cyclone chamber and the vacuum adsorption unit both generate negative pressure, and the compressed air is discharged into the atmosphere from the exhaust chamber.

3. The vacuum adsorption vibration sensor according to claim 2, characterized in that: The vacuum generating unit further comprises a steady flow cavity, and two sides of the steady flow cavity are respectively connected with the gas delivery cavity and the jet cavity.

4. The vacuum adsorption vibration sensor according to claim 3, characterized in that: The diameter of the jet cavity along the conveying direction of the compressed gas first decreases and then increases.

5. The vacuum adsorption vibration sensor according to claim 1, characterized in that: The vacuum generating unit comprises a vacuum pipe, one side of which is connected via a negative pressure element and the negative pressure element provides vacuum negative pressure to the vacuum pipe, and the other side of which is connected to the vacuum adsorption unit to generate negative pressure in the vacuum adsorption unit.

6. The vacuum adsorption vibration sensor according to any one of claims 1 to 5, characterized in that: The vacuum adsorption unit includes a vacuum suction cup and an adsorption hole arranged through the vacuum suction cup, and one side of the adsorption hole is connected to the vacuum generating unit.

7. The vacuum adsorption vibration sensor according to claim 1, characterized in that: The real-time parameters include vibration parameters of the vibration load, or include vibration parameters and temperature parameters of the vibration load.

8. The vacuum adsorption vibration sensor according to claim 7, characterized in that: The sensor unit includes at least one of a temperature-vibration composite sensor and a vibration sensor.

9. The vacuum adsorption vibration sensor according to claim 8, characterized in that: The temperature-vibration composite sensor includes a thermally conductive strip, one end of which passes through the vacuum adsorption unit and is connected to the interior of the temperature-vibration composite sensor, and the other end of which abuts against the vibration load. The temperature-vibration composite sensor is used to detect vibration parameters and temperature parameters of the vibration load.

10. The vacuum adsorption vibration sensor according to claim 1, characterized in that: The sensor unit includes a sensitive element and an amplifying circuit arranged on the vacuum adsorption unit.

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