Fuel gas flow controller based on stepping motor control butterfly valve

Abstract

The utility model provides a gas flow controller based on a stepping motor control butterfly valve, which comprises a first valve body, a second valve body and a control unit, the first valve body is internally provided with a first gas channel, the first valve body is provided with a gas inlet interface which is communicated with the first gas channel and is suitable for being connected with an external gas source, and the second valve body is provided with a gas outlet interface which is suitable for being connected with an external gas source. The first valve body is provided with an electromagnetic valve with a plug capable of ascending and descending in the radial direction of the first gas channel, the second valve body is internally provided with a second gas channel connected with the first gas channel, the second valve body is provided with a gas outlet connector communicated with the second gas channel, and the second valve body is further provided with a rotating shaft penetrating through the second gas channel in the radial direction. One end of the rotating shaft is connected with an output shaft of the stepping motor, the other end of the rotating shaft is connected with the second valve body, a butterfly valve is fixed to the rotating shaft, a butterfly valve piece of the butterfly valve is located in the second gas channel, and the electromagnetic valve and the stepping motor are both electrically connected with the control unit. The stepping motor drives the butterfly valve plate to rotate to control the gas flow, reliability is high, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of gas flow control, in particular to a gas flow controller based on a stepping motor controlling a butterfly valve. Background Art

[0002] A gas flow controller is a device used to precisely control the flow of gas. It is widely used in a variety of industrial, laboratory and medical equipment. It can keep the gas flow stable and ensure that it meets specific flow requirements. The working principle is based on the law of conservation of mass and Bernoulli's principle. When the gas passes through the flow controller, it will pass through a series of accurate flow calculators to measure the flow of the gas. These calculators can use different technologies for measurement such as thermal, mass flow meter or pressure differential. After measuring the gas flow, the flow controller will adjust the action of the valve or other control device according to the difference between the required flow and the actual flow. This adjustment can be achieved through a feedback control loop to ensure that the error between the actual flow and the required flow is minimized.

[0003] The inventors of this application have discovered through research that existing gas flow controllers, such as fuel gas flow controllers, control the gas flow by controlling the on and off time of the solenoid valve. However, this method has problems such as rapid wear and tear of the solenoid valve and inability to be used for a long time, and thus cannot meet the long-term reliable operation requirements of the engine. Utility Model Content

[0004] The existing gas flow controller controls the gas flow by controlling the on and off time of the solenoid valve, but this method has the technical problem that the solenoid valve wears out too quickly and cannot be used for a long time, and thus cannot meet the technical requirements of long-term reliable operation of the engine. The utility model provides a gas flow controller based on a stepper motor controlling a butterfly valve.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A gas flow controller based on a stepper motor controlled butterfly valve comprises a first valve body, a second valve body and a control unit, wherein a first gas channel is arranged inside the first valve body, a gas inlet interface which is communicated with the first gas channel and suitable for being connected to an external gas source is arranged on the first valve body, a solenoid valve is arranged on the first valve body, a plug of the solenoid valve can be raised and lowered radially in the first gas channel, a second gas channel is arranged inside the second valve body, an inlet interface of the second gas channel is connected to an outlet interface of the first gas channel, a gas outlet interface which is communicated with the second gas channel and suitable for being connected to an engine throttle is arranged on the second valve body, a rotating shaft which radially passes through the second gas channel is also arranged on the second valve body, one end of the rotating shaft is connected to an output shaft of a stepper motor, and the other end of the rotating shaft is connected to the second valve body, a butterfly valve is fixed on the rotating shaft, a butterfly valve sheet of the butterfly valve is located in the second gas channel, and both the solenoid valve and the stepper motor are electrically connected to the control unit.

[0007] Compared with the prior art, the gas flow controller based on the stepper motor controlled butterfly valve provided by the utility model first controls the solenoid valve plug to rise through the control unit, allowing the external gas to enter the first gas channel through the gas inlet interface, and then the control unit controls the stepper motor to rotate, and the stepper motor drives the butterfly valve plate of the butterfly valve on the rotating shaft to rotate, changing the flow cross-sectional area of ​​the second gas channel, thereby controlling the gas flow in the second gas channel, and finally the gas enters the engine throttle from the gas outlet interface. The utility model controls the gas flow by controlling the rotation angle of the butterfly valve plate through the stepper motor, with high adjustment accuracy, fast response speed, simple operation, easy to realize automatic control, high reliability, long life, low maintenance cost, and can meet the long-term reliable operation requirements of the engine.

[0008] Furthermore, the gas inlet interface of the second gas channel is connected to the gas outlet interface of the first gas channel in one piece or through a gas pipe.

[0009] Furthermore, the second valve body is also provided with an angle sensor, a temperature sensor and a pressure sensor which are electrically connected to the control unit respectively, the angle sensor is connected to the other end of the rotating shaft, and the temperature sensor and the pressure sensor are inserted into the second gas channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a schematic diagram of the structure of a gas flow controller based on a stepper motor controlling a butterfly valve.

[0011] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure in the AA direction.

[0012] Figure 3 yes Figure 1A schematic diagram of the structure viewed from the front along the gas outlet interface.

[0013] Figure 4 yes Figure 1 Schematic diagram of the structure of the first valve body.

[0014] Figure 5 yes Figure 1 Schematic diagram of the structure of the second valve body.

[0015] In the figure, 1. first valve body; 11. first gas channel; 12. gas inlet interface; 13. gas outlet interface; 2. second valve body; 21. second gas channel; 22. gas inlet interface; 23. gas outlet interface; 3. solenoid valve; 31. plug; 4. rotating shaft; 5. stepper motor; 6. butterfly valve plate; 7. angle sensor; 8. temperature sensor; 9. pressure sensor. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0017] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships 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 a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected 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 according to specific circumstances.

[0019] Please refer to Figures 1 to 5As shown, the utility model provides a gas flow controller based on a stepper motor controlled butterfly valve, comprising a first valve body 1, a second valve body 2 and a control unit (not shown in the figure), wherein a first gas passage 11 is arranged inside the first valve body 1, and a gas inlet interface 12 which is communicated with the first gas passage 11 and is suitable for being connected to an external gas source is arranged on the first valve body 1, and a solenoid valve 3 is arranged on the first valve body 1, and a plug 31 of the solenoid valve 3 can be raised and lowered radially in the first gas passage 11, and the plug 31 can be a plug in the shape of a disc, a cone, a sphere or other shapes, and a second gas passage 21 is arranged inside the second valve body 2, and an inlet interface 22 of the second gas passage 21 is connected to an outlet interface 13 of the first gas passage 11, and a gas inlet interface 22 which is communicated with the second gas passage 21 and is suitable for being connected to an engine throttle is arranged on the second valve body 2. The second valve body 2 is also provided with a rotating shaft 4 which radially passes through the second gas channel 21, one end of the rotating shaft 4 is connected to the output shaft of the stepper motor 5, and the other end of the rotating shaft 4 is connected to the second valve body 5. A butterfly valve is fixed on the rotating shaft 4, and the butterfly valve plate 6 of the butterfly valve is located in the second gas channel 21. The solenoid valve 3 and the stepper motor 5 are both electrically connected to the control unit, and the control unit can be specifically implemented by an existing single-chip microcomputer or a PLC controller. On the one hand, the control unit is used to control the lifting and lowering of the plug 31 of the solenoid valve 3 so that the gas enters the first gas channel 11, and on the other hand, it is used to control the rotation of the stepper motor 5 to drive the butterfly valve plate 6 to rotate through the rotating shaft 4 to change the flow cross-sectional area of ​​the second gas channel, thereby accurately controlling the gas flow rate in the second gas channel 21.

[0020] Compared with the prior art, the gas flow controller based on the stepper motor controlled butterfly valve provided by the utility model first controls the solenoid valve plug to rise through the control unit, allowing the external gas to enter the first gas channel through the gas inlet interface, and then the control unit controls the stepper motor to rotate, and the stepper motor drives the butterfly valve plate of the butterfly valve on the rotating shaft to rotate, changing the flow cross-sectional area of ​​the second gas channel, thereby controlling the gas flow in the second gas channel, and finally the gas enters the engine throttle from the gas outlet interface. The utility model controls the gas flow by controlling the rotation angle of the butterfly valve plate through the stepper motor, with high adjustment accuracy, fast response speed, simple operation, easy to realize automatic control, high reliability, long life, low maintenance cost, and can meet the long-term reliable operation requirements of the engine.

[0021] As a specific embodiment, the air inlet interface 22 of the second gas channel 21 is connected integrally with the air outlet interface 13 of the first gas channel 11 or connected through an air pipe. The integral connection means that the air inlet interface 22 of the second gas channel 21 is directly connected to the air outlet interface 13 of the first gas channel 11, and the air pipe connection means that the air inlet interface 22 of the second gas channel 21 is indirectly connected to the air outlet interface 13 of the first gas channel 11 through an air pipe. At this time, the first valve body 1 and the second valve body 2 are split structures.

[0022] As a specific example, please refer to Figure 2 As shown, the second valve body 2 is also provided with an angle sensor 7, a temperature sensor 8 and a pressure sensor 9 which are electrically connected to the control unit respectively. The angle sensor 7 is connected to the other end of the rotating shaft 4. The temperature sensor 8 and the pressure sensor 9 are inserted into the second gas channel 21. The angle sensor 7 is used to detect the rotation angle of the rotating shaft 4 driven by the stepper motor 5. The temperature sensor 8 and the pressure sensor 9 are used to detect the gas temperature and pressure in the second gas channel 21 respectively. The control unit fine-tunes the rotation angle of the stepper motor 5 according to the rotation angle of the rotating shaft 4 detected by the angle sensor 7, thereby controlling the rotation of the butterfly valve plate 6. The control unit also fine-tunes the rotation angle of the stepper motor 5 according to the detection data of the external control object (not limited to the engine speed or the load size). Specifically, the control unit estimates the current gas flow rate through the gas temperature and / or pressure detected by the sensor, and then estimates the target required gas flow rate according to the detection data of the external control object. If the estimated target required gas flow rate is greater than the current gas flow rate, the control unit controls the rotation angle of the stepper motor 5 to increase; otherwise, the control unit controls the rotation angle of the stepper motor 5 to decrease, thereby more accurately controlling the gas flow rate in the second gas channel 21.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A gas flow controller based on a stepper motor controlling a butterfly valve, characterized in that: The control unit comprises a first valve body, a second valve body and a control unit, wherein a first gas channel is arranged inside the first valve body, a gas inlet interface which is communicated with the first gas channel and is suitable for being connected to an external gas source is arranged on the first valve body, a solenoid valve is arranged on the first valve body, a plug of the solenoid valve can be raised and lowered radially in the first gas channel, a second gas channel is arranged inside the second valve body, the inlet interface of the second gas channel is connected with the outlet interface of the first gas channel, a gas outlet interface which is communicated with the second gas channel and is suitable for being connected to a throttle of an engine is arranged on the second valve body, a rotating shaft which radially passes through the second gas channel is also arranged on the second valve body, one end of the rotating shaft is connected with the output shaft of a stepper motor, the other end of the rotating shaft is connected with the second valve body, a butterfly valve is fixed on the rotating shaft, a butterfly valve sheet of the butterfly valve is located in the second gas channel, and the solenoid valve and the stepper motor are both electrically connected to the control unit.

2. The gas flow controller based on stepper motor controlled butterfly valve according to claim 1 is characterized in that: The gas inlet interface of the second gas channel is connected to the gas outlet interface of the first gas channel in one piece or through a gas pipe.

3. The gas flow controller based on stepper motor controlled butterfly valve according to claim 1, characterized in that: The second valve body is also provided with an angle sensor, a temperature sensor and a pressure sensor which are electrically connected to the control unit respectively. The angle sensor is connected to the other end of the rotating shaft, and the temperature sensor and the pressure sensor are inserted into the second gas channel.

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