Blade type rotating speed sensor

Abstract

The utility model provides a blade type rotating speed sensor, which comprises a rotating shaft positioned in an engine, a plurality of fan blades arranged at the tail part of the rotating shaft and rotating along with the rotating shaft, a light-transmitting part arranged on the rotating shaft in a penetrating manner and enabling the rotating shaft to be provided with two ports, and two fixing parts arranged on the rotating shaft and not rotating along with the rotating shaft, a protection part covering the rotating shaft is connected between the two fixing parts, two through holes are formed in the protection part corresponding to the light-transmitting part, one through hole is provided with a transmitting part, the other through hole is provided with a receiving part, and when the light-transmitting part right faces the receiving part, the receiving part can receive signals transmitted by the transmitting part. According to the blade type rotating speed sensor, when the rotating shaft rotates for two circles, two-time signal transmission is completed, so that the rotating speed of the fan blades can be acquired, the blade type rotating speed sensor is stable and reliable, electromagnetic interference can be avoided, and improvement of stability and reliability in the information acquisition process is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile engines, in particular to a blade type rotation speed sensor. Background Art

[0002] The engine completes a working cycle including four processes: intake, compression, combustion expansion and exhaust. During the intake process, fresh air or a mixture of fuel and air is sucked in through the intake duct. In order to improve the mixing and combustion of fuel and air in the cylinder, in diesel engines, it is generally hoped that the gas in the cylinder will produce a certain vortex around the cylinder axis after the intake process is completed; in gasoline engines, it is hoped that the mixture in the cylinder will produce a certain tumble perpendicular to the cylinder axis. Whether it is intake vortex or intake tumble, its flow intensity must meet the needs of the combustion process.

[0003] Usually, the flow intensity is evaluated by the ratio of the vortex or tumble speed in the cylinder at the end of the intake process to the engine speed, which is called the swirl ratio. In addition, the generation of vortex or tumble will be accompanied by flow loss, which is usually expressed by the integral average of the ratio of the measured flow rate to the theoretical flow rate during the flow process, which is called the average flow coefficient. Both parameters are expressed as dimensionless quantities. During the mass production of the engine, the stability of the airway manufacturing must also be inspected to ensure the engine performance. The optimized design of the engine intake system can make the airflow in the cylinder move in a specific form to improve its combustion process, so the characteristics of the intake system have a significant impact on the comprehensive performance of the engine. Tumble is a kind of airflow movement that rotates in the direction perpendicular to the cylinder axis formed in the cylinder during the intake process.

[0004] When conducting an engine tumble airway test, it is necessary to measure the blade speed RPM at each lift of the engine cylinder. The existing blade speed sensor uses a photodiode, which cannot be threaded and fixed. The installation is not firm and is often affected by the airflow inside the cylinder. The photodiode circuit is routed inside the cylinder and is easily disturbed, resulting in a high failure rate. Utility Model Content

[0005] In view of this, the utility model aims to propose a blade type rotation speed sensor to realize the collection of blade rotation speed and improve the stability and reliability of the information collection process.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A blade-type speed sensor includes a rotating shaft located inside an engine, a plurality of fan blades are provided at the rear of the rotating shaft, the fan blades rotate with the rotating shaft, a light-transmitting portion is penetrated through the rotating shaft and the rotating shaft has two ports, two fixed portions are provided on the rotating shaft, the two fixed portions do not rotate with the rotating shaft, a protective member covered outside the rotating shaft is connected between the two fixed portions, two through holes are opened on the protective member corresponding to the light-transmitting portion, a transmitting member is provided on one of the through holes, and a receiving member is provided on the other through hole, and when the light-transmitting portion faces the receiving member, the receiving member can receive the signal sent by the transmitting member.

[0008] Furthermore, the two fixing parts are respectively located at the end of the rotating shaft away from the fan blade, and between the fixing part at the end and the fan blade.

[0009] Furthermore, the fixing portion adopts a bearing.

[0010] Furthermore, the light-transmitting portion is a light-transmitting hole provided on the rotating shaft, and two light-transmitting holes are arranged opposite to each other to penetrate the rotating shaft.

[0011] Furthermore, the through hole is a threaded hole, and the transmitting element and the receiving element are threadedly connected to the through hole.

[0012] Furthermore, the transmitting element adopts a fiber optic transmitter, and the receiving element adopts a fiber optic receiver. The fiber optic transmitter can emit laser after being turned on. When the rotating shaft rotates 180 degrees with the fan blades, the light-transmitting part faces the transmitting element again, and the receiving element receives a primary light signal from the transmitting element.

[0013] Furthermore, the protective member is a shell.

[0014] Furthermore, a PLC controller is provided for receiving the optical signal to calculate the rotation speed of the fan blades.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The blade-type speed sensor described in the utility model can drive the rotating shaft to rotate when the fan blades rotate, so that the light-transmitting part is not aligned with the transmitting element. At this time, the rotating shaft can block the signal sent by the transmitting element. When the rotating shaft rotates until the light-transmitting part is facing the receiving element, the receiving element can receive the signal from the transmitting element. When the rotating shaft rotates two circles, the signal transmission is completed twice, so that the fan blade speed can be collected stably and reliably while avoiding electromagnetic interference, which is beneficial to the improvement of stability and reliability in the process of collecting information.

[0017] In addition, the transmitting part adopts a fiber optic transmitter and the receiving part adopts a fiber optic receiver. On the one hand, the fiber optic transmitter can be powered on without connecting to a power source, avoiding the problem of line entanglement. On the other hand, the fiber optic transmitter has low cost, simple setting and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention. The directional terms such as front and back, top and bottom involved therein are only used to indicate relative positional relationships and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the blade-type speed sensor described in an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1. Rotating shaft; 2. Fan blades; 3. Light-transmitting part; 30. Light-transmitting hole; 4. Fixing part; 40. Bearing; 5. Protective part; 50. Through hole; 6. Transmitting part; 7. Receiving part. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] The present embodiment relates to a blade-type speed sensor. In terms of overall structure, the blade-type speed sensor includes a rotating shaft 1 located inside the engine. A plurality of fan blades 2 are provided at the rear of the rotating shaft 1. The fan blades 2 rotate with the rotating shaft 1. A light-transmitting portion 3 is penetrated through the rotating shaft 1 so that the rotating shaft 1 has two ports. Two fixed portions 4 are provided on the rotating shaft 1. The two fixed portions 4 do not rotate with the rotating shaft 1. A protective member 5 covered outside the rotating shaft 1 is connected between the two fixed portions 4. Corresponding to the light-transmitting portion 3, two through holes 50 are opened on the protective member 5. A transmitting member 6 is provided on one of the through holes 50, and a receiving member 7 is provided on the other through hole 50. When the light-transmitting portion 3 faces the receiving member 7, the receiving member 7 can receive the signal sent by the transmitting member 6.

[0027] As shown in the above structure, when the fan blades 2 rotate, the shaft 1 can be driven to rotate, so that the light-transmitting part 3 is not aligned with the transmitting element 6. At this time, the shaft 1 can block the signal sent by the transmitting element 6. When the shaft 1 rotates until the light-transmitting part 3 is facing the receiving element 7, the receiving element 7 can receive the signal from the transmitting element 6. When the shaft 1 rotates two circles, the signal transmission is completed twice, so that the rotation speed of the fan blades 2 can be collected stably and reliably while avoiding electromagnetic interference, which is beneficial to the improvement of stability and reliability in the process of collecting information.

[0028] Based on the above overall design, an exemplary structure of a blade-type speed sensor of this embodiment is as follows: Figure 1 As shown, it is worth mentioning that the number of the aforementioned fan blades 2 can be set to two, three, etc. In this embodiment, the number of fan blades 2 is two, but this embodiment is only an example and no specific limitation is imposed on the number of fan blades 2.

[0029] In this embodiment, the two fixing parts 4 are respectively located at the end of the rotating shaft 1 away from the fan blade 2, and between the fixing part 4 at the end and the fan blade 2. The fixing part 4 adopts a bearing 40, so the setting of the fixing part 4 is not affected during the rotation of the rotating shaft 1, and the protective member 5 connected to the cover and arranged outside the rotating shaft 1 is not affected by the rotation of the rotating shaft 1.

[0030] In addition, the light-transmitting portion 3 is a light-transmitting hole 30 provided on the rotating shaft 1, and two light-transmitting holes 30 are arranged opposite to each other to penetrate the rotating shaft 1. In this way, the rotating shaft 1 has a penetrating light-transmitting hole 30, and when the rotating shaft 1 rotates one circle, the transmitting element 6 and the receiving element 7 will complete two transmissions and receptions, and the light is transmitted once when the rotating shaft 1 rotates 180 degrees, and the light is transmitted once when the rotating shaft 1 rotates 360 degrees, that is, one circle. The rotating shaft 1 rotates one circle to achieve two light transmissions, complete two signal transmissions, and realize the collection of pulse signals.

[0031] Specifically, the transmitting element 6 adopts a fiber optic transmitter, and the receiving element 7 adopts a fiber optic receiver. The fiber optic transmitter can emit laser light after being turned on. When the rotating shaft 1 rotates 180 degrees with the fan blade 2, the light-transmitting portion 3 faces the transmitting element 6 again, and the receiving element 7 receives the primary light signal from the transmitting element 6. The transmitting element 6 adopts a fiber optic transmitter, and the receiving element 7 adopts a fiber optic receiver. On the one hand, the fiber optic transmitter can be powered on without connecting to a power source, avoiding the problem of line entanglement. On the other hand, the fiber optic transmitter has a low cost, is simple to set up, and is easy to operate.

[0032] Still refer to Figure 1 As shown, the through hole 50 is a threaded hole, and the transmitting element 6 and the receiving element 7 are threadedly connected to the through hole 50, so that the whole is not easy to fall off and the installation is more secure. In addition, the aforementioned protective element 5 is a shell.

[0033] The blade speed sensor of this embodiment also includes a PLC controller for receiving optical signals to calculate the speed of the fan blade 2. It should also be noted that when performing an engine tumble airway test, it is necessary to measure the blade speed RPM at each lift of the engine cylinder block. At the same time, a volume flow meter is used to measure the volume flow Qv in the airway. The engine cylinder diameter is represented by B, and the engine stroke is represented by S. According to the formula Ne=Qv×30÷((π÷4)×B2×S), the virtual engine speed Ne is calculated. Through the blade speed RPM and the virtual engine speed Ne, the tumble ratio Rs is finally calculated according to the formula Rs=RPM×2÷Ne, and the above calculation process and results are all calculated by the PLC controller.

[0034] The blade-type speed sensor described in this embodiment uses a fiber optic transmitter and a fiber optic receiver to replace the original photodiode. The fiber optic transmitter and the fiber optic receiver are installed by threads, and the signal is transmitted to the fiber optic receiver through the optical fiber to realize the collection of the fan blade 2 speed signal, which solves the problem that the photodiode cannot be fixed. The signal is transmitted to the fiber optic receiver by optical fiber, and no power supply is required, that is, there is no direct electrical connection, which can prevent electromagnetic interference from affecting the sensor, greatly reducing the failure rate, and is conducive to improving the stability and reliability of the information collection process.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vane-type speed sensor, comprising a rotating shaft (1) located inside an engine, characterized in that: A plurality of blades (2) are provided at the rear of the rotating shaft (1), and the blades (2) rotate with the rotating shaft (1). A light-transmitting portion (3) is provided through the rotating shaft (1) so that the rotating shaft (1) has two ports. Two fixed portions (4) are provided on the rotating shaft (1), and the two fixed portions (4) do not rotate with the rotating shaft (1). A protective member (5) is connected between the two fixed portions (4) and is arranged outside the rotating shaft (1). Two through holes (50) are provided on the protective member (5) corresponding to the light-transmitting portion (3), and a transmitting member (6) is provided on one of the through holes (50), and a receiving member (7) is provided on the other through hole (50). When the light-transmitting portion (3) faces the receiving member (7), the receiving member (7) can receive a signal emitted by the transmitting member (6).

2. The vane type speed sensor according to claim 1, characterized in that: The two fixing portions (4) are respectively located at the end of the rotating shaft (1) away from the fan blade (2), and between the fixing portion (4) at the end and the fan blade (2).

3. The vane type speed sensor according to claim 2, characterized in that: The fixing portion (4) adopts a bearing (40).

4. The vane type speed sensor according to claim 1, characterized in that: The light-transmitting portion (3) is a light-transmitting hole (30) provided on the rotating shaft (1), and two light-transmitting holes (30) are arranged opposite to each other to penetrate the rotating shaft (1).

5. The vane type speed sensor according to claim 1, characterized in that: The through hole (50) is a threaded hole, and the transmitting element (6) and the receiving element (7) are threadedly connected to the through hole (50).

6. The vane type speed sensor according to claim 5, characterized in that: The transmitting element (6) adopts an optical fiber transmitter, and the receiving element (7) adopts an optical fiber receiver. The optical fiber transmitter can emit laser light after being turned on. When the rotating shaft (1) rotates 180 degrees along with the fan blade (2), the light-transmitting portion (3) faces the transmitting element (6) again, and the receiving element (7) receives a primary optical signal from the transmitting element (6).

7. The vane-type speed sensor according to any one of claims 1 to 6, characterized in that: The protective member (5) is a shell.

8. The vane-type speed sensor according to claim 5, characterized in that Also includes: A PLC controller is used for receiving the optical signal to calculate the rotation speed of the fan blade (2).

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