Venturi nozzle with automatic plugging function

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a Venturi nozzle with an automatic plugging function, which comprises a nozzle shell, a flow channel, and a cylindrical cavity penetrating the flow channel; a valve core, one end surface of the valve core being provided with a valve rod, a side wall of the valve core being provided with a valve hole, and the valve core being rotatably arranged in the cylindrical cavity; when the Venturi nozzle is in an open state, the valve core is rotated by a preset angle, the valve hole is in butt joint with the flow channel, and the flow channel is in communication; when the nozzle is in a closed state, the valve core is rotated by a preset angle, a wall surface of the valve core blocks the flow channel, and the flow channel is closed; and a driving device, the driving device being connected with the valve rod and driving the valve core to rotate through torque transmission of the valve rod; wherein the valve rod is provided with a lever, the lever is rotated to a preset angle to be in contact with a limit switch, and the limit switch feeds back a signal to the driving device to stop the driving of the driving device. The Venturi nozzle of the application saves resources, adopts an automatic plugging technology to replace manual plugging, and does not need to use additional manpower and material resources to complete the work.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engines, and particularly relates to a Venturi nozzle with an automatic plugging function. BACKGROUND

[0002] At present, an engine intake flow calibration device is mainly used to calibrate an engine intake flow pipe, so as to obtain an accurate engine air flow value, and thus to evaluate technical indexes such as performance and safety of the engine. The critical flow Venturi nozzle is used as a main standard device of the intake flow calibration device, and when the engine intake flow pipe is calibrated, the flow through the engine intake flow pipe and the flow through the critical flow Venturi nozzle group are the same, so that the comparison calibration of the engine intake flow can be realized.

[0003] Due to different engines, the Venturi nozzle needs to be plugged before calibration test. The prior art is to use a manual plugging mechanism to plug the Venturi nozzle. The intake flow calibration device generally has a relatively large structure size, and it is not convenient to manually operate in the device; and when the calibration state is switched, the engine needs to be started repeatedly, and the test efficiency is relatively low.

[0004] In order to solve the above problems, a Venturi nozzle with an automatic plugging function is provided, which can complete the intake flow calibration of different state points in one engine starting process. SUMMARY

[0005] In order to solve the above problems, the application provides a Venturi nozzle with an automatic plugging function, which comprises:

[0006] A nozzle shell has a flow channel and a cylindrical cavity penetrating the flow channel;

[0007] A valve core has a valve rod at one end surface, and a valve hole in the side wall, and the valve core is rotatably arranged in the cylindrical cavity; when the Venturi nozzle is in an open state, the valve core is rotated by a preset angle, the valve hole is butt-jointed with the flow channel, and the flow channel is communicated; when the nozzle is in a closed state, the valve core is rotated by a preset angle, and the valve core wall surface plugs the flow channel, so that the flow channel is closed;

[0008] A driving device is connected to the valve rod, and drives the valve core to rotate through the valve rod;

[0009] The valve rod has a lever, and the lever is rotated to a preset angle to contact a limit switch, and the limit switch feeds back a signal to the driving device to stop driving.

[0010] Preferably, the valve core has a valve cover at the end face of the valve stem, the valve cover has a central hole sleeved on the valve stem, the valve cover is matched with the cylindrical cavity opening through a shoulder, and the top of the valve cover has a gland sleeved on the valve stem, the gland is screwed into the gland through the partial thread on the valve stem, so that the gland, the valve cover and the valve core are fixed as a whole.

[0011] Preferably, the valve core has a flow passage sealing ring outside the valve hole, and the wall surface of the valve core at the flow passage has a solid sealing ring; the end face of the valve core with the valve stem has a valve stem circumferential sealing ring around the valve stem.

[0012] Preferably, the Venturi nozzle comprises a nozzle horn section and a nozzle diffusion section, and the nozzle horn section and the nozzle diffusion section are connected through a flange.

[0013] Preferably, the driving device comprises a motor, a measurement and control system and a speed reducer, the output shaft of the motor is connected with the speed reducer, and the measurement and control system is connected with the motor and sends a driving instruction to the motor.

[0014] Preferably, the cylindrical cavity is located in the middle of the nozzle diffusion section.

[0015] Preferably, the edge of the gland has a circumferentially extending circular arc groove, a limiting block is fixed on the wall surface of the cylindrical cavity, the limiting block is placed in the circular arc groove, the two side groove walls of the circular arc groove limit the circumferential rotation of the valve core when the two side groove walls contact with the limiting block, and the included angle between the two side groove walls is greater than the included angle of the valve core between the open state and the closed state of the nozzle.

[0016] The advantages of the present application include that the Venturi nozzle of the present application saves resources, adopts automatic plugging technology to replace manual plugging, and does not need to use additional manpower and material resources to complete the work.

[0017] The test efficiency is high, and the air intake flow calibration of different state points in the one-time starting process of the engine can be realized through the automatic plugging technology, and no additional preparation time is needed when the state points are switched. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of the Venturi nozzle with automatic plugging function of a preferred embodiment of the present application;

[0019] Figure 2 is a sectional view of the Venturi nozzle with automatic plugging function of a preferred embodiment of the present application;

[0020] Figure 3 is a schematic view of the valve core flow passage and solid sealing structure. DETAILED DESCRIPTION

[0021] For the purpose, technical solutions and advantages of the present application, the technical solutions in the embodiments of the present application will be described in more detail below in combination with the drawings in the embodiments of the present application. In the drawings, the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0022] To solve the above technical problems, the present patent designs a Venturi nozzle with automatic plugging function. The Venturi nozzle comprises a reducer 1, a motor mounting seat 2, a motor 3, a measurement and control system 4, a gland 5, a limit switch 6, a compression nut 7, a valve core 8, a valve cover 9, a limit block 10, a valve cover circumferential sealing ring 11, a valve rod circumferential sealing ring 12, a nozzle diffusion section 13, a flow passage sealing ring 14, a nozzle horn section 15, and a solid sealing ring 16. Figure 1 Figure 2 Due to the constraint of the working position of the Venturi nozzle, the installation and disassembly are facilitated, the Venturi nozzle body is divided into the nozzle diffusion section 13 and the nozzle horn section 15, the nozzle diffusion section 13 and the nozzle horn section 15 are connected through flanges, and the connection is positioned by a stop. The motor 3 is connected with the reducer 1, the reducer 1 is connected with the valve core 8, the valve cover 9 is connected with the inner wall of the nozzle diffusion section 13, and the compression nut 7 is connected with the valve core 8 through threads. The compression nut 7 and the valve core 8 are fastened through threads, on the one hand, the gland 5 can be compressed on the valve cover 9, and on the other hand, an upward tension can be applied to the valve core 8, so that the compression nut 7, the gland 5 and the valve core 8 rotate together without relative movement.

[0023] In the design of the nozzle, the leakage problem is solved through internal sealing design and external sealing design. In the internal sealing design, the flow passage sealing ring 14 and the solid sealing ring 16 are used to ensure sealing. The flow passage sealing ring 14 is used to realize circumferential sealing of the working flow passage, so that the fluid medium does not leak out when the nozzle works. The solid sealing ring 16 is used to realize circumferential sealing of the lateral solid, so that the fluid medium does not leak out when the nozzle does not work. In the external sealing design, the valve cover circumferential sealing ring 11 and the valve rod circumferential sealing ring 12 are used to ensure sealing. The valve rod circumferential sealing ring 12 is used to realize circumferential sealing of the top of the valve core 8, so that the fluid medium does not leak out in the working state and the non-working state of the nozzle. The valve cover circumferential sealing ring 11 is used to realize circumferential sealing of the valve cover 9, so that the fluid medium does not leak out in the working state and the non-working state of the nozzle.

[0024] ​When the nozzle is moved from open to close or from close to open, power is transmitted to the 1 reducer under the drive of the 3 motor, and the 8 valve core obtains smooth power through the key connection between the 1 reducer and the 8 valve core, thereby driving the 8 valve core to rotate. When the 8 valve core rotates through a certain angle, the shift rod on the 8 valve core screw rod touches the 6 limit switch, and the 6 limit switch feeds back a signal to the 4 measurement and control system. According to the feedback signal, the 3 motor stops working. When the 6 limit switch fails, the 10 limit block on the 13 nozzle diffusion section plays an additional protection role, so that the repositioning accuracy of the nozzle opening meets the design requirements, and the flow channel surface is continuous and has no reverse step.

[0025] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A venturi nozzle with automatic sealing function, characterized in that, The utility model relates to a kind of venturi nozzle, including: Nozzle housing, with flow channel and cylindrical cavity with flow channel; Valve core (8), one end surface of valve core (8) has valve stem, its side wall has valve hole, valve core (8) can be rotated and placed in cylindrical cavity;When venturi nozzle is in open state, valve core (8) rotates preset angle, valve hole is connected with flow channel, flow channel flows, when nozzle is in closed state, valve core (8) rotates another preset angle, valve core (8) wall surface blocks flow channel, flow channel is closed; Driving device, driving device is connected with the valve stem, and the valve stem is driven to rotate valve core (8) by torque; Wherein, the valve stem has a lever, the lever rotates to preset angle and contacts limit switch (6), limit switch (6) feedback signal to driving device to make driving device stop driving.

2. The venturi nozzle with automatic sealing function according to claim 1, characterized in that, Valve core (8) has valve cover (9) at the end surface where valve stem is located, valve cover (9) has central hole on valve stem, valve cover (9) is matched with the mouth of cylindrical cavity by stop, the top of valve cover (9) also has gland (5) on valve stem, compression nut (7) is screwed into compression gland (5) with the partial thread on valve stem, so that compression gland (5), valve cover (9) and valve core (8) are fixed as a whole.

3. The venturi nozzle with automatic sealing function according to claim 1, characterized in that, The valve hole outside valve core (8) has flow channel sealing ring (14), and the wall surface of valve core (8) blocking flow channel has solid sealing ring (16);The end surface of valve core (8) with valve stem has valve stem circumferential sealing ring (12) around valve stem.

4. The venturi nozzle with automatic sealing function according to claim 1, characterized in that, The venturi nozzle includes nozzle horn section (15) and nozzle diffusion section (13), and the nozzle horn section (15) is connected with the nozzle diffusion section (13) by flange.

5. The venturi nozzle with automatic sealing function according to claim 1, characterized in that, The driving device includes motor (3), measurement and control system (4) and speed reducer (1), the output shaft of motor (3) is connected with speed reducer (1), and measurement and control system (4) is connected with motor (3) and sends driving instruction to motor (3).

6. The venturi nozzle with automatic sealing function according to claim 4, characterized in that, The cylindrical cavity is located in the middle of nozzle diffusion section (13).

7. The venturi nozzle with automatic sealing function according to claim 1, characterized in that, The edge of gland (5) has circumferentially extending circular slot, limit block (10) is fixed on the wall surface of cylindrical cavity, limit block (10) is placed in the circular slot, when the groove wall between the two sides of the circular slot contacts limit block (10), the circumferential rotation of valve core (8) is limited, and the included angle between the groove wall between the two sides of the circular slot is greater than the included angle of valve core (8) between the open state and the closed state of nozzle.

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