Control mechanism of flow regulating valve

Abstract

A flow regulating valve control mechanism comprises a stepping motor and a driving rod connected with a flow regulating valve, an inner threaded hole is coaxially formed in the front end of a main shaft of the stepping motor, a guide hole coaxial with the main shaft is formed in the center of a front end cover of the stepping motor, a first guide key or a guide groove is axially formed in the guide hole, and the driving rod is provided with an outer threaded section and a guide section. The periphery of the guide section is axially provided with a second guide key or a guide groove; the external thread section extends into the internal thread hole and is in threaded connection with the internal thread hole, the guide section is inserted into the guide hole, and the first guide key or the guide groove and the second guide groove or the guide key are clamped in a matched mode; when the main shaft rotates positively and negatively, the driving rod linearly moves back and forth under the limitation of the guide section and the guide hole to drive the flow regulating valve to regulate the flow; an angle sensor is coaxially installed at the rear end of the spindle, the angular displacement amount of the spindle is accurately fed back through the angle sensor, then the rotation angle of the stepping motor is accurately controlled, and accurate control over the front-back moving distance of the driving rod is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flow regulating valve control, and in particular relates to a flow regulating valve control mechanism.

[0002] The flow control valve is the core component of the flow regulator. It controls the flow of the flow regulator by changing the flow cross-sectional area of ​​the control valve to achieve the flow regulation function. Specifically, the flow of the control valve is controlled by controlling the forward and backward movement of the regulating cone of the control valve. In recent years, more stringent requirements have been put forward for the control accuracy and reliability of fuel flow regulation on aviation and aerospace equipment. The traditional motor deceleration adjustment mechanism can no longer meet the user's more stringent requirements for control accuracy, mechanical properties and use environment. Summary of the invention

[0003] The present invention provides a flow regulating valve control mechanism to meet users' more stringent requirements on control accuracy, mechanical properties and use environment.

[0004] The technical solution adopted by the present invention is: a flow control valve control mechanism, comprising a stepper motor and a driving rod connected to the flow control valve, the main shaft front end of the stepper motor is coaxially provided with an internal threaded hole, the front end cover of the stepper motor is centrally provided with a guide hole coaxial with the main shaft, the guide hole is axially provided with a first guide key or guide groove, the driving rod has an external thread section and a guide section, the outer periphery of the guide section is axially provided with a second guide key or guide groove; the external thread section extends into the internal threaded hole and is threadedly connected with the internal threaded hole, the guide section is inserted into the guide hole, and the first guide key or guide groove is adapted to be clamped with the second guide groove or guide key; When the main shaft rotates forward and reversely, the driving rod moves back and forth linearly under the restriction of the guide section and the guide hole, driving the flow regulating valve to adjust the flow; An angle sensor is coaxially mounted on the rear end of the spindle, and the angular displacement of the spindle is accurately fed back by the angle sensor, thereby accurately controlling the rotation angle of the stepper motor and realizing precise control of the forward and backward movement distance of the drive rod.

[0005] The first guide key or guide groove and the second guide groove or guide key are both arranged in a spline shape.

[0006] An annular boss is provided at the junction of the external thread section and the guide section, and the annular boss is located in the inner cavity of the front end cover.

[0007] The rear end of the stepper motor is coaxially fixedly connected with an annular housing. The angle sensor is a rotary transformer. The rotor of the rotary transformer is fixedly sleeved on the rear end of the rotating shaft. The stator of the rotary transformer is coaxially fixed in the annular housing.

[0008] The rear end of the annular shell is fixedly connected with a rear end cover, the rear part of the rear end cover is installed with an electric connector, and the lead wires of the stepping motor and the rotary transformer are connected with the electric connector.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The invention solves the problem of high-precision flow control of the flow control valve by effectively cooperating with a high-precision rotary transformer, a stepper motor and a ball screw. It meets the user's more stringent requirements on control accuracy, mechanical properties and use environment. It is particularly suitable for regulating and controlling the fuel flow of aviation and aerospace equipment, with high control accuracy and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic cross-sectional view of the structure of the present invention; Figure 2 This is a schematic diagram of the contracted state of the driving rod of the present invention; Figure 3 It is a schematic diagram of the driving rod of the present invention in an extended state. DETAILED DESCRIPTION

[0011] The following is combined with Figure 1-3 The present invention is described in detail with specific embodiments.

[0012] A flow control valve control mechanism, comprising a stepper motor 1 and a drive rod 7 connected to the flow control valve, wherein the front end of the main shaft 6 of the stepper motor 1 is coaxially provided with an internal threaded hole 6-1, the center of the front end cover 2 of the stepper motor 1 is provided with a guide hole 2-2 coaxial with the main shaft 6, the inner axial direction of the guide hole 2-2 is provided with a first guide key or guide groove 2-3, the drive rod 7 is provided with an external thread section 7-1 and a guide section 7-2, the outer axial direction of the guide section 7-2 is provided with a second guide key or guide groove 7-3; the external thread section 7-1 extends into the internal threaded hole 6-1 and is threadedly connected with the internal threaded hole 6-1, the guide section 7-2 is inserted into the guide hole 2-2, and the first guide key or guide groove 2-3 is adapted to be clamped with the second guide groove or guide key 7-3; Preferably, a ball is provided between the internal and external threads of the external thread section 7-1 and the internal thread hole 6-1 to improve the stability and efficiency of converting the rotational motion into linear motion.

[0013] When the main shaft 6 rotates forward and reverse, the driving rod 7 moves back and forth in a straight line under the restriction of the guide section 7-2 and the guide hole 2-2, driving the flow regulating valve to adjust the flow; An angle sensor 8 is coaxially mounted at the rear end of the spindle 6 , and the angle sensor 8 accurately feeds back the angular displacement of the spindle 6 , thereby accurately controlling the rotation angle of the stepper motor 1 , thereby achieving precise control of the forward and backward movement distance of the drive rod 7 .

[0014] In one embodiment, the first guide key or guide groove 2-3 and the second guide groove or guide key 7-3 are both arranged in a spline shape, preferably in a cross spline shape.

[0015] In one embodiment, an annular boss 7-4 is provided at the junction of the external thread section 7-1 and the guide section 7-2, and the annular boss 7-4 is located in the inner cavity of the front end cover 2. The telescopic range of the driving rod 7 is limited by the inner cavity length of the front end cover 2.

[0016] In one embodiment, the rear end of the stepper motor 1 is coaxially fixedly connected to an annular shell 4, the angle sensor 8 is preferably a rotary transformer, the rotor 5 of the rotary transformer is sleeved and fixed on the rear end of the rotating shaft 6, and the stator 3 of the rotary transformer is coaxially fixed in the annular shell 4.

[0017] In one embodiment, the rear end of the annular housing 4 is fixedly connected to a rear end cover 9, and an electrical connector 10 is installed at the rear of the rear end cover 9. The lead wires of the stepper motor 1 and the rotary transformer are connected to the electrical connector 10. The electrical connector 10 facilitates electrical connection with a power supply and a control system.

[0018] In specific operation, the end of the driving rod 7 is connected to the regulating cone of the flow regulating valve, and the stepper motor 1 is started. The main shaft 6 rotates forward and backward to drive the driving rod 7 to move back and forth in a straight line. The driving rod 7 drives the regulating cone to move forward and backward. When the regulating cone extends forward, the flow rate decreases, and when the regulating cone retracts, the flow rate increases. At the same time, the angular displacement of the main shaft 6 is accurately fed back through the rotary transformer, and the rotation angle of the stepper motor 1 is accurately controlled to achieve precise control of the forward and backward movement distance of the driving rod 7.

[0019] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A flow control valve control mechanism, characterized in that: The invention comprises a stepper motor (1) and a driving rod (7) connected to a flow regulating valve, wherein the front end of the main shaft (6) of the stepper motor (1) is coaxially provided with an internal threaded hole (6-1), the front end cover (2) of the stepper motor (1) is centrally provided with a guide hole (2-2) coaxially provided with the main shaft (6), the inner axial direction of the guide hole (2-2) is provided with a first guide key or guide groove (2-1), the driving rod (7) has an external threaded section (7-1) and a guide section (7-2), the outer axial direction of the guide section (7-2) is provided with a second guide key or guide groove (7-3); the external threaded section (7-1) extends into the internal threaded hole (6-1) and is threadedly connected to the internal threaded hole (6-1), the guide section (7-2) is inserted into the guide hole (2-2), and the first guide key or guide groove (2-1) is adapted to be clamped with the second guide groove or guide key (7-3); When the main shaft (6) rotates forward and reverse, the driving rod (7) moves back and forth in a straight line under the restriction of the guide section (7-2) and the guide hole (2-2), driving the flow regulating valve to adjust the flow; An angle sensor (8) is coaxially mounted on the rear end of the spindle (6), and the angle sensor (8) accurately feeds back the angular displacement of the spindle (6), thereby accurately controlling the rotation angle of the stepper motor (1), thereby achieving precise control of the forward and backward movement distance of the drive rod (7).

2. The flow control valve control mechanism according to claim 1, characterized in that: The first guide key or guide groove (2-1) and the second guide groove or guide key (7-3) are both arranged in a spline shape.

3. The flow control valve control mechanism according to claim 1, characterized in that: An annular boss (7-4) is provided at the junction of the external thread section (7-1) and the guide section (7-2), and the annular boss (7-4) is located in the inner cavity of the front end cover (2).

4. The flow control valve control mechanism according to claim 1, characterized in that: The rear end of the stepper motor (1) is coaxially fixedly connected to an annular housing (4); the angle sensor (8) is a rotary transformer; the rotor (5) of the rotary transformer is sleeved and fixed on the rear end of the rotating shaft (6); and the stator (3) of the rotary transformer is coaxially fixed in the annular housing (4).

5. The flow control valve control mechanism according to claim 4, characterized in that: A rear end cover (9) is fixedly connected to the rear end of the annular housing (4), an electrical connector (10) is installed at the rear of the rear end cover (9), and leads of the stepping motor (1) and the rotary transformer are connected to the electrical connector (10).

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