Motor anti-locking device and flowmeter

Abstract

The invention provides a motor anti-jamming device and a flowmeter, the motor anti-jamming device comprises a motor, a rotating shaft, a moving part and a limiting part, the motor drives the rotating shaft to rotate under control, the moving part is coupled with the rotating shaft, and the limiting part is coupled with the rotating shaft. The moving part is driven by the rotating shaft to do linear motion on the axis of the rotating shaft, and the limiting part is used for limiting the linear motion of the moving part within a preset range. According to the flow control method and device, the problem that the use of the flow meter is affected due to the fact that a motor is stuck when flow control is conducted through motor driving in the prior art is solved, the situation that the motor is stuck is prevented to a certain extent, and the stability of the flow meter is improved.

Description

Technical Field

[0001] The present application relates to the field of control, and in particular to a motor anti-jamming device and a flow meter. Background Art

[0002] In a flow meter, the flow rate is usually controlled by the degree of opening and closing of the valve driven by a motor (the flow rate can be liquid flow rate or other flow rate). Therefore, the mechanism on the valve used to control the flow rate is more important for flow control.

[0003] The patent application document of CN103354800A discloses a flow control structure. Figure 1 It is a schematic diagram of the flow meter control structure in the prior art, such as Figure 1 As shown, the controller adjusts the flow rate by controlling the motor A. The motor A is connected to the diaphragm C through the connecting rod B, and the flow rate is controlled by the position of the diaphragm C. Figure 1 The power source is the control motor A. The motor will rotate after being powered on, while the connecting rod B needs to move linearly. Therefore, the rotation of the motor needs to be converted into linear motion.

[0004] Of course, in addition to this flow control structure, other types of flow control structures can also be used. In any flow control structure, a motor is currently used as a drive. The motor may get stuck during movement, thereby affecting the use of the flow meter. Summary of the invention

[0005] The embodiments of the present application provide a motor anti-stuck device (or called a motor limit device) and a flow meter to at least solve the problem of motor jamming that affects the use of the flow meter when using a motor drive for flow control in the related art.

[0006] According to one aspect of the present application, a motor anti-stuck device is provided, comprising: a motor, a rotating shaft, a moving component and a limiting component, wherein: the motor drives the rotating shaft to perform rotational motion under control, the moving component is coupled to the rotating shaft, the moving component performs linear motion on the axis of the rotating shaft driven by the rotating shaft, and the limiting component is used to limit the linear motion of the moving component within a predetermined range.

[0007] Further, the moving part is a slider nut, and the limiting part is a switch device. When the slider nut moves to a first position, the switch device is in a first state, and the first state is used to indicate that the motor stops rotating in a first direction; when the slider nut moves to a second position, the switch device is in a second state, and the second state is used to indicate that the motor stops rotating in a second direction, wherein the first direction and the second direction are different.

[0008] Further, the slider nut includes a cylindrical part, one end of which is connected to the rotating shaft, and a groove is opened on the slider nut, and the groove limits the linear motion of the slider nut within a predetermined distance. The limiting component for limiting the linear motion of the slider nut includes two ends, and the linear motion of the slider nut is limited between the two ends. The two ends are respectively equipped with a first button and a second button, wherein the first button and the second button are touched during the linear motion of the slider nut, and when the first button is touched, the rotation of the motor in the first direction is stopped, and when the second button is touched, the rotation of the motor in the second direction is stopped.

[0009] Furthermore, the slider nut includes a cylindrical part, one end of which is connected to the rotating shaft, and a grating pointer is arranged on the slider nut. The grating pointer moves between the preset upper grating and lower grating under the drive of the slider nut, and the linear motion of the slider nut is restricted between the two gratings. When the grating pointer touches the upper grating, the rotation of the motor in the first direction is stopped, and when the grating pointer touches the lower grating, the rotation of the motor in the second direction is stopped.

[0010] Furthermore, the other end of the cylindrical part is used to connect to the diaphragm, or is connected to the diaphragm through a transfer nut. When the other end is directly connected to the diaphragm, the end face shape of the other end is adapted to the shape of the diaphragm; when it is connected to the diaphragm through a transfer nut, the end face shape of the other end is adapted to the shape of the transfer nut.

[0011] Further, the moving part includes a reducing nut, and the limiting part includes N limiting rings, wherein N is greater than or equal to 1, and the reducing nut rotates under the drive of the motor, and the reducing nut is used to drive the diaphragm B14 to move through the sliding screw. A flange is provided on the reducing nut, and the flange drives the first limiting ring of the N limiting rings to rotate, and each limiting ring is provided with a baffle. When the baffle in the first limiting ring contacts the baffle in the second limiting ring, the first limiting ring drives the second limiting ring to rotate, and so on, until the Nth limiting ring is driven to rotate, wherein the Nth limiting ring is restricted from moving.

[0012] Furthermore, the limiting component includes three reducing rings.

[0013] Furthermore, after the Nth limiting ring contacts the limiting pin on the retaining frame, it is mechanically limited by the limiting pin.

[0014] Further, the predetermined range limited by the limiting component is obtained by pre-testing or calculation.

[0015] According to another aspect of the present application, a flow meter is also provided, comprising the above-mentioned motor anti-jamming device.

[0016] In the embodiment of the present application, a motor, a rotating shaft, a moving part and a limiting part are used, wherein: the motor drives the rotating shaft to perform a rotating motion under control, the moving part is coupled to the rotating shaft, the moving part performs a linear motion on the axis of the rotating shaft under the drive of the rotating shaft, and the limiting part is used to limit the linear motion of the moving part within a predetermined range. The present application solves the problem of affecting the use of the flow meter due to motor jamming when using a motor drive for flow control in the related art, thereby preventing the motor from jamming to a certain extent and improving the stability of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a schematic diagram of the flow meter control structure according to the prior art;

[0019] Figure 2 is a structural schematic diagram of a flow control valve according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a slider nut according to an embodiment of the present application;

[0021] Figure 4 is an exploded view of a flow control valve according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a motor according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of a transfer nut according to an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of a spring according to an embodiment of the present application;

[0025] Figure 8 is a schematic diagram of a sealing ring according to an embodiment of the present application;

[0026] Fig. 9 is a schematic diagram of a valve body according to an embodiment of the present application;

[0027] Fig.10 is a schematic diagram of a diaphragm according to an embodiment of the present application Figure 1 ;

[0028] Fig.11 is a schematic diagram of a diaphragm according to an embodiment of the present application Figure 2 ;

[0029] Fig.12 is a schematic diagram of a motor anti-jamming device according to Embodiment 1 of the present application;

[0030] Fig.13 is a schematic diagram of a motor anti-stuck device according to Embodiment 2 of the present application;

[0031] Fig.14a Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 1 ;

[0032] Fig.14b Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 2 ;as well as,

[0033] Fig.14c Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 3 . DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The motor anti-jamming device in the following embodiments can be applied to various types or structures of devices driven by motors, and can be particularly applied to flow meter structures.

[0036] Figures 2 to 11 is a schematic structural diagram of a motor-driven flow meter according to an embodiment of the present application, Figures 2 to 11 The flow meter shown in FIG. 1 is not equipped with an anti-jamming device. Figures 2 to 11 It should be noted that the following anti-jamming device can also be applied to flow control valves of other structures, and only needs to be adjusted according to the specific structure.

[0037] Let's first combine Figures 2 to 11 A flow control valve will be described as an example. Figure 2 is a schematic diagram of the structure of a flow control valve according to an embodiment of the present application, such as Figure 2 As shown, the flow regulating valve includes: a valve body B15, a diaphragm B14, a transfer nut B13, a valve gland B10, a valve end cover B9, a spring B8, a valve sealing ring B6, a valve sealing shell B5, a stepping motor B4, a slider nut B3, a retaining frame B1, a rotating shaft B16 and a limit column B11, etc.

[0038] exist Figure 2 In the flow control valve shown, the stepper motor drives the rotating shaft to rotate, and then the rotation of the stepper motor is converted into the linear motion of the valve body through the slider nut and the adapter nut, so as to achieve the function of controlling the flow. This is explained below.

[0039] Figure 2 The flow regulating valve shown includes: a stepper motor, a rotating shaft, a slider nut, a transfer nut and a diaphragm, wherein the stepper motor drives the rotating shaft to perform rotational motion under control, the slider nut is coupled to the rotating shaft, and the slider nut performs linear motion on the axis of the rotating shaft driven by the rotating shaft; the first end of the transfer nut is connected to the slider nut, the second end of the transfer nut is connected to the diaphragm, the slider nut drives the diaphragm to perform linear motion through the transfer nut, and the linear motion of the diaphragm is used to control the flow rate.

[0040] Figure 3 is a schematic diagram of a slider nut according to an embodiment of the present application, such as Figure 3 As shown, the slider nut includes a first cylinder and a second cylinder, wherein the second cylinder and the first cylinder are coaxially arranged, the diameter of the first cylinder is larger than that of the second cylinder, the central axis of the slider nut is hollow, the diameter of the hollow part is adapted to the rotating axis, and the second cylinder is used to connect with the adapter nut.

[0041] As an optional implementation, Figure 4 is an exploded view of a flow control valve according to an embodiment of the present application, such as Figure 4 As shown, the flow regulating valve may further include: a retaining frame, the retaining frame is adapted to the shape of the stepping motor, and the retaining frame is sleeved on the stepping motor; at least two equidistant notches are also provided on the first cylinder of the slider nut, the number of the limiting columns B11 is the same as the number of the notches, the limiting columns pass through the notches, and the slider nut is installed on the retaining frame, the slider nut can move linearly along the axis of the limiting column, and the limiting column is used to limit the rotation of the slider nut.

[0042] exist Figure 4 There are three notches on the first cylinder of the slider nut, and the slider nut is installed on the retaining frame B1 through three limiting columns; the retaining frame is fixed to the stepping motor through fixing screws B2.

[0043] In another optional embodiment, it may also include: a valve cover B10 and a spring B8, wherein one end of the spring B8 is in contact with the adapter nut, and the other end of the spring is in contact with the valve cover, and when the adapter nut moves toward the valve cover, the spring is compressed; the valve cover is fixed to the retaining frame by a fixing screw B2, and there is a certain distance between the retaining frame and the valve cover.

[0044] It should be noted that the fixing screws B2 used in different positions can be selected to an appropriate length according to different needs. The spring can be selected in various forms. Figure 7 is a schematic diagram of a spring according to an embodiment of the present application, such as Figure 7 As shown, a spring of a rotating shape can be selected. The spring is used to eliminate the gap, so that the internal thread surface and the external thread surface of the transmission mechanism are pressed tightly to eliminate the return difference.

[0045] exist Figure 4 It may also include a valve sealing shell B5 and a valve sealing ring B6, wherein the valve sealing shell is used to place the following components: the stepper motor, the retaining frame, the slider nut, the adapter nut, the spring and the valve gland; the valve sealing ring is fixed to the valve sealing shell by a fixing screw B2.

[0046] exist Figure 4 The valve seal housing may further include a valve end cover B9, which is fixed to the valve seal housing by fixing screws; a gap matching the shape of the diaphragm is provided at the center of the valve end cover, and the diaphragm may be placed in the gap.

[0047] Figure 5 is a schematic diagram of a motor according to an embodiment of the present application, such as Figure 5 As shown, the motor is in the shape of a cuboid, and the four prisms of the cuboid are chamfered, which is convenient for the installation of the motor.

[0048] Figure 6 is a schematic diagram of a transfer nut according to an embodiment of the present application, such as Figure 6 As shown, the adapter nut includes two cylinders, one of which has a larger diameter than the other, and the central axes of the two cylinders included in the adapter nut are the same. The cylinder with a larger diameter is used to connect the slider nut, and the cylinder with a smaller diameter is used to connect the diaphragm. The adapter nut is used to connect the diaphragm and the slider nut.

[0049] Optionally, protruding portions protruding from the surface of the cylinder are equidistantly arranged on the cylinder with a larger diameter of the nut.

[0050] When the rotating shaft of the motor rotates, the slider nut makes a linear motion on the axis of the rotating shaft. The cooperation between the slider nut and the rotating shaft of the progressive motor controls the quantitative opening and closing of the diaphragm. The opening and closing of the diaphragm achieves the purpose of controlling the water flow rate. This structure can output torque linearly, thereby ensuring stable flow control.

[0051] Figure 8 is a schematic diagram of a sealing ring according to an embodiment of the present application, such as Figure 8 As shown, the sealing ring has a hollow rectangle and four screw holes on the edge of the sealing ring. Figure 8 The sealing ring can prevent water vapor from the humid environment from penetrating into the internal system, avoid aging and damage of components, and extend the service life.

[0052] Fig. 9 is a schematic diagram of a valve body according to an embodiment of the present application, such as Fig. 9 As shown, the valve body B15 of the flow regulating valve is a channel for fluid to flow in and out.

[0053] The membrane in the above embodiment can be in various shapes, for example, Fig.10 is a schematic diagram of a diaphragm according to an embodiment of the present application Figure 1 , Fig.11 is a schematic diagram of a diaphragm according to an embodiment of the present application Figure 2 ,like Fig.10 and Fig.11 As shown, the diaphragm B14 includes: a connecting column A1, a wall A2 and a tip A4, wherein the first end of the connecting column A1 is used to fix the diaphragm at a position where the diaphragm needs to be installed, and the tip A4 is provided on the second end of the connecting column A1; the connecting column A1 and the tip A4 are coaxial, the wall A2 is in the shape of a bowl, the axis of the connecting column A1 and the tip A4 passes through the bottom center of the bowl, the first end of the tip A4 is connected to the connecting column A1, and the second end of the tip A4 exceeds the plane where the bowl mouth of the bowl is located; the width of the first end of the tip A4 in the direction perpendicular to the axis is greater than the width of the second end of the tip A4 in the direction perpendicular to the axis. The tip A4 structure is a cone, and the diameter of the bottom circle of the cone is greater than the diameter of the circle of the cylindrical connector.

[0054] The contact area between the taper of the diaphragm tip A4 and the water flow is getting smaller and smaller. When the water flow rate is large, the contact area with the water flow is small, so that the water flow flows more smoothly, which can reduce the impact of the water flow on the diaphragm and prevent the diaphragm from shaking. The smaller the taper of the tip A4, the larger the initial flow rate, and the upper limit of the flow rate can be adjusted to the maximum extent. The connector A1, the tip A4 and the wall A2 can be integrally formed. Of course, they are not integrally formed, and can be flexibly selected according to actual needs. Optionally, the diaphragm can also include an annular body A3, which is arranged on the bowl mouth of the wall A2, and the second end of the tip A4 protrudes from the annular plane of the annular body. The annular plane can also be provided with an annular groove. The annular plane is tightly combined with the pressing piece through the pressure of the pressing piece to prevent water from infiltrating and achieve good sealing. The groove is connected to the protrusion on the valve to play a sealing role.

[0055] The above embodiments can effectively suppress the reflection phenomenon caused by water flow impacting the tank wall, make the water flow smoother, reduce the noise interference caused by flow reflection, improve the stability of the flow field, and improve the control accuracy of the flow controller.

[0056] The motor anti-jamming device is described below in conjunction with the above embodiments.

[0057] As an optional embodiment, the motor anti-stuck device may include: a stepper motor, a rotating shaft and a slider nut (an embodiment of a moving part), wherein the stepper motor drives the rotating shaft to perform a rotating motion under control, the slider nut is coupled to the rotating shaft, and the slider nut performs a linear motion on the axis of the rotating shaft under the drive of the rotating shaft; Fig.12 The difference between the slider nut in the embodiment and the slider nut in the above embodiment is that Fig.12 The slider nut B3 in the embodiment may include a cylindrical portion, one end of which is connected to the rotating shaft and the other end is connected to the diaphragm (or connected to the diaphragm through an adapter nut, when the other end is directly connected to the diaphragm, the end surface shape of the other end is adapted to the shape of the diaphragm; when the other end is connected to the diaphragm through an adapter nut, the end surface shape of the other end is adapted to the shape of the adapter nut). A groove is formed on the slider nut, and the groove limits the linear motion of the slider nut within a predetermined distance. The portion for limiting the linear motion of the slider nut includes two ends, and the linear motion of the slider nut is limited between the two ends. The two ends are respectively provided with a first button and a second button, wherein the first button and the second button are touched during the linear motion of the slider nut, and when the first button is touched, the rotation of the motor in the first direction is stopped, and when the second button is touched, the rotation of the motor in the second direction is stopped, wherein the first direction and the second direction are different.

[0058] Fig.12 is a schematic diagram of a motor anti-stuck device according to Embodiment 1 of the present application, such as Fig.12 As shown, in an optional embodiment of the motor anti-jamming device, the slider nut is limited to a specific working range to prevent the motor from getting stuck. Fig.12 In addition to the components such as the retainer B1, the slider nut B3, the valve end cover B9, the diaphragm B14 and the valve body B15 described in the above embodiments, two buttons can be used. The two buttons can be membrane buttons, which are called the first button and the second button. Fig.12 The middle corresponds to the lower membrane button C6 and the upper membrane button C7. The device limits the motor movement within a specific range through two membrane buttons, effectively reducing the risk of motor jamming, improving the reliability and safety of motor operation, and ensuring the stable operation of the entire system. Fig.12 In the example shown, it is easy to operate, not easy to be accidentally touched or stuck, and the structure is stable and reliable. The slider nut B3 touches two buttons in the vertical direction during the up and down movement. When the slider nut B3 triggers the lower membrane button C6, the motor stops moving downward, so that there is a gap H between the slider nut and other components, avoiding the motor from getting stuck and damaging other parts due to over-adjustment. When the slider nut B3 triggers the upper membrane button C7, the motor stops moving upward, ensuring that other parts will not be damaged due to over-adjustment when the valve is closed. The button spacing L is derived from actual test data, and this spacing ensures that the valve can be closed without damaging other parts.

[0059] As another optional embodiment, in the motor anti-stuck device, it may include: a stepper motor, a rotating shaft and a slider nut (an embodiment of a moving part), wherein the stepper motor drives the rotating shaft to perform a rotating motion under control, the slider nut is coupled to the rotating shaft, and the slider nut performs a linear motion on the axis of the rotating shaft under the drive of the rotating shaft; Fig.13 The difference between the slider nut in the embodiment and the slider nut in the above embodiment is that Fig.13The slider nut B3 in the embodiment may include a cylindrical portion, one end of which is connected to the rotating shaft, and the other end is connected to the diaphragm (or connected to the diaphragm through an adapter nut, when the other end is directly connected to the diaphragm, the end surface shape of the other end is adapted to the shape of the diaphragm; when connected to the diaphragm through an adapter nut, the end surface shape of the other end is adapted to the shape of the adapter nut). A grating pointer is provided on the slider nut, and the grating pointer moves between the preset upper grating and lower grating under the drive of the slider nut, and the linear motion of the slider nut is limited between the two gratings, and when the grating pointer touches the upper grating, the rotation of the motor in the first direction is stopped, and when the grating pointer touches the lower grating, the rotation of the motor in the second direction is stopped, wherein the first direction and the second direction are different.

[0060] Fig.13 is a schematic diagram of a motor anti-stuck device according to Embodiment 2 of the present application, such as Fig.13 The motor anti-jamming device shown in the figure prevents the motor from getting stuck due to over-adjustment during operation. Fig.13 The components may include a retainer B1, a slider nut B3, a valve end cover B9, a diaphragm B14 and a valve body B15. The motor anti-stuck function can be realized by a grating. Fig.13 In the embodiment, the grating pointer D6, the lower grating D7 and the upper grating D8 can be used. The lower grating D7 and the upper grating D8 emit light beams to form a grating. The device limits the movement range of the slider nut by monitoring the changes in the light beams in the grating area, thereby ensuring the normal operation of the motor.

[0061] The grating anti-jamming device is a technology that uses grating technology to prevent the motor from mechanically jamming. The grating can split the light into multiple beams and convert the light signal into an electrical signal through a photoelectric conversion device. During the motor rotation process, the grating technology is used to limit the motor's movement range to ensure the stable operation of the entire system. Fig.13 As shown, the grating pointer D6 passes through two photoelectric switches in the vertical direction during the up and down movement. When the grating pointer D6 triggers the lower grating D7, it stops moving downward to ensure that there is a gap H between the slider nut B3 and other mechanisms to avoid excessive adjustment and the valve being stuck. When the grating pointer D6 moves upward to trigger the upper grating D8, the slider nut B3 continues to move upward for a specific distance A. Under the condition that the valve is closed, it is ensured that the motor will not be stuck and other parts will not be damaged due to excessive adjustment. Grating spacing L + specific distance A = closing distance S, to ensure that the entire motion system operates stably within the set range. The specific distance A is the empirical value of the experimental results, and the influencing factors are the diaphragm B14 and the valve body B15.

[0062] In another optional embodiment, the motor anti-stuck device may include: a motor, a reducing nut and N limit rings, wherein N is greater than or equal to 1, and the reducing nut rotates driven by the motor, and the reducing nut is used to drive the diaphragm B14 to move through a sliding screw.

[0063] The reducing nut is provided with a flange, and the flange drives the first limiting ring among the N limiting rings to rotate. Each limiting ring is provided with a baffle. When the baffle in the first limiting ring contacts the baffle in the second limiting ring, the first limiting ring drives the second limiting ring to rotate, and so on, until the Nth limiting ring is driven to rotate, wherein the Nth limiting ring is restricted from moving.

[0064] When the reducing nut E2 rotates clockwise, the flange feature on the reducing nut drives the limit ring E3a to rotate after half a circle; the limit ring E3a drives the limit ring E3b to rotate after one circle; the limit ring E3b drives the limit ring E3c to rotate after one circle, and finally the limit ring E3c contacts the limit pin E7 on the retaining frame B1 for mechanical limitation, and then the system can only move in the opposite direction, and the operation process is the same, reciprocating cycle, so that the reducing nut E2 can only rotate within the limited 3-circle range, and at the same time, the torque is transmitted to the slider pin E7, and the linear motion within the set range is performed when the valve end cover B9 limits its rotational motion, effectively preventing the motor from getting stuck or damaged when it exceeds the working range.

[0065] Fig.14a Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 1 ; Fig.14b Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 2 ; Fig.14c Schematic diagram of a motor anti-jamming device according to Embodiment 3 of the present application Figure 3 ,like Fig.14a , Fig.14b and Fig.14c As shown in the figure, the optional motor anti-jamming device is a mechanical protection measure to prevent the motor from getting stuck due to excessive tightening of the transmission thread caused by over-adjustment during the axial relative movement between the motor shaft and the slider screw. Fig.14a C shows the retainer B1, the reducing nut E2, the limiting ring E3a, the limiting ring E3b, the limiting ring E3c, the slider screw E6, the limiting pin E7 and the valve end cover B9. The device limits the motor movement within a specific range through three limiting rings (but not limited to), ensuring the stable operation of the whole system and avoiding the motor from getting stuck.

[0066] The motor anti-jamming device mainly includes two parts: a motor and a limit ring. The motor is a key component for driving the equipment, and the limit ring is used to limit the movement range of the motor. Fig.14c This is the initial state of the motor anti-stuck device assembly. When the reducer nut E2 rotates clockwise, the flange feature on the reducer nut drives the limit ring E3a to rotate after half a circle; the limit ring E3a drives the limit ring E3b to rotate after one circle; the limit ring E3b drives the limit ring E3c to rotate after one circle, and finally the limit ring E3c contacts the limit pin E7 on the retaining frame B1 for mechanical limiting, and then the system can only move in the opposite direction, and the operation process is the same, reciprocating cycle, so that the reducer nut E2 can only rotate within the limited 3-circle range, and at the same time, the torque is transmitted to the slider pin E7, and the linear motion within the set range is performed when the valve end cover B9 limits its rotational motion, effectively preventing the motor from getting stuck or damaged when it exceeds the working range.

[0067] It can be seen from the above embodiments that the motor anti-stuck device may include: a motor, a rotating shaft, a moving component and a limiting component, wherein the motor drives the rotating shaft to perform rotational motion under control, the moving component is coupled to the rotating shaft, and the moving component performs linear motion on the axis of the rotating shaft driven by the rotating shaft, and the limiting component is used to limit the linear motion of the moving component within a predetermined range.

[0068] As an optional embodiment, the moving component is a slider nut, and the limiting component is a switch device. When the slider nut moves to a first position, the switch device is in a first state, and the first state is used to indicate that the motor stops rotating in a first direction; when the slider nut moves to a second position, the switch device is in a second state, and the second state is used to indicate that the motor stops rotating in a second direction, wherein the first direction and the second direction are different.

[0069] Corresponds to Fig.12The slider nut B3 includes a cylindrical part, one end of which is connected to the rotating shaft, and the other end is used to connect to the diaphragm (or connected to the diaphragm through an adapter nut. When the other end is directly connected to the diaphragm, the end surface shape of the other end is adapted to the shape of the diaphragm; when connected to the diaphragm through an adapter nut, the end surface shape of the other end is adapted to the shape of the adapter nut). The slider nut is provided with a groove, and the groove limits the linear motion of the slider nut within a predetermined distance. The limiting component for limiting the linear motion of the slider nut includes two ends, and the linear motion of the slider nut is limited between the two ends. The two ends are respectively equipped with a first button and a second button, wherein the first button and the second button are touched during the linear motion of the slider nut. When the first button is touched, the rotation of the motor in the first direction is stopped, and when the second button is touched, the rotation of the motor in the second direction is stopped.

[0070] Corresponds to Fig.13 The slider nut B3 includes a cylindrical part, one end of which is connected to the rotating shaft, and the other end is used to connect to the diaphragm (or connected to the diaphragm through an adapter nut. When the other end is directly connected to the diaphragm, the end surface shape of the other end is adapted to the shape of the diaphragm; when connected to the diaphragm through an adapter nut, the end surface shape of the other end is adapted to the shape of the adapter nut). A grating pointer is provided on the slider nut. The grating pointer moves between the preset upper grating and lower grating under the drive of the slider nut. The linear motion of the slider nut is limited between the two gratings. When the grating pointer touches the upper grating, the rotation of the motor in the first direction is stopped. When the grating pointer touches the lower grating, the rotation of the motor in the second direction is stopped.

[0071] In another optional embodiment, the moving part includes a reducing nut, and the limiting part includes N limiting rings, wherein N is greater than or equal to 1, and the reducing nut rotates under the drive of the motor, and the reducing nut is used to drive the diaphragm B14 to move through a sliding screw. A flange is provided on the reducing nut, and the flange drives the first limiting ring of the N limiting rings to rotate, and each limiting ring is provided with a baffle. When the baffle in the first limiting ring contacts the baffle in the second limiting ring, the first limiting ring drives the second limiting ring to rotate, and so on, until the Nth limiting ring is driven to rotate, wherein the Nth limiting ring is restricted from moving.

[0072] The above embodiments solve the problem of the motor getting stuck when using a motor drive for flow control in the related art, which affects the use of the flow meter. This prevents the motor from getting stuck to a certain extent and improves the stability of the flow meter.

[0073] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A motor anti-jamming device, characterized in that: include: Motors, rotating shafts, moving parts and restraining parts, where: The motor drives the rotating shaft to perform rotational motion under control, the moving component is coupled to the rotating shaft, and the moving component performs linear motion on the axis of the rotating shaft driven by the rotating shaft. The limiting component is used to limit the linear motion of the moving component within a predetermined range.

2. The device according to claim 1, characterized in that The moving part is a slider nut, and the limiting part is a switch device. When the slider nut moves to a first position, the switch device is in a first state, and the first state is used to instruct the motor to stop rotating in a first direction; when the slider nut moves to a second position, the switch device is in a second state, and the second state is used to instruct the motor to stop rotating in a second direction, wherein the first direction and the second direction are different.

3. The device according to claim 2, characterized in that The slider nut includes a cylindrical part, one end of which is connected to the rotating shaft, and a groove is formed on the slider nut, and the groove limits the linear motion of the slider nut within a predetermined distance. The limiting component for limiting the linear motion of the slider nut includes two ends, and the linear motion of the slider nut is limited between the two ends. The two ends are respectively equipped with a first button and a second button, wherein the first button and the second button are touched during the linear motion of the slider nut, and when the first button is touched, the rotation of the motor in the first direction is stopped, and when the second button is touched, the rotation of the motor in the second direction is stopped.

4. The device according to claim 2, characterized in that The slider nut includes a cylindrical part, one end of which is connected to the rotating shaft. A grating pointer is arranged on the slider nut. The grating pointer moves between a preset upper grating and a lower grating under the drive of the slider nut. The linear motion of the slider nut is restricted between the two gratings. When the grating pointer touches the upper grating, the rotation of the motor in the first direction is stopped. When the grating pointer touches the lower grating, the rotation of the motor in the second direction is stopped.

5. The device according to claim 3 or 4, characterized in that The other end of the cylindrical part is used to connect to the diaphragm, or to connect to the diaphragm through a transfer nut. When the other end is directly connected to the diaphragm, the end face shape of the other end is adapted to the shape of the diaphragm; when connected to the diaphragm through a transfer nut, the end face shape of the other end is adapted to the shape of the transfer nut.

6. The device according to claim 1, characterized in that The moving part includes a reducing nut, and the limiting part includes N limiting rings, wherein N is greater than or equal to 1. The reducing nut rotates under the drive of the motor, and the reducing nut is used to drive the diaphragm B14 to move through the sliding screw. A flange is provided on the reducing nut, and the flange drives the first limiting ring of the N limiting rings to rotate. Each limiting ring is provided with a baffle. When the baffle in the first limiting ring contacts the baffle in the second limiting ring, the first limiting ring drives the second limiting ring to rotate, and so on, until the Nth limiting ring is driven to rotate, wherein the Nth limiting ring is restricted from moving.

7. The device according to claim 6, characterized in that The limiting component includes three reducing rings.

8. The device according to claim 6, characterized in that After the Nth limiting ring contacts the limiting pin on the retaining frame, it is mechanically limited by the limiting pin.

9. The device according to any one of claims 1 to 4 or any one of claims 6 to 8, characterized in that: The predetermined range limited by the limiting component is obtained by pre-testing or calculation.

10. A flow meter, characterized in that: The invention comprises the motor anti-jamming device according to any one of claims 1 to 9.

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