Mechanical dual limit alarm rotor flow switch

Abstract

The present application relates to the technical field of rotor flowmeter, and provides a mechanical double-limit alarm rotor flow switch, which comprises a mounting frame, an indicating needle assembly, an upper limit contact detection mechanism, a lower limit contact detection mechanism and a contact lever, the indicating needle assembly is used for indicating upper limit and lower limit scales of flow on a dial plate, the upper contact probe and the lower contact probe can be in contact with the indicating needle assembly, the reset assembly can be in transmission connection with the contact probe, the contact lever can push the upper contact probe or the lower contact probe to rotate, and electrical connection is generated when the contact lever is in contact, at this time, the upper contact probe or the lower contact probe is disconnected from the transmission connection with the reset assembly, and after the contact lever is separated from the upper contact probe or the lower contact probe, the reset assembly can drive the upper contact probe or the lower contact probe to rotate, so that the technical problems that the contact cannot be reset and the contact can affect the precision of the pointer in the mechanical double-limit alarm device in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotor flowmeter, in particular, to a mechanical double-limit alarm rotor flow switch. BACKGROUND

[0002] The rotor flow switch is an instrument for measuring the instantaneous flow value of liquid or gas. It measures the flow rate by setting a rotor that moves with the flow in the pipeline and transmitting the displacement of the rotor to the pointer through magnetic coupling to indicate the flow rate. In use, an electronic transmitter is arranged in the rotor flow switch to transmit the detected flow information to the control room for system control, thereby adjusting the flow and opening and closing at each place. However, in actual use, the electrical signals transmitted in the instrument may be affected by dust, aging, software, temperature and humidity, etc., resulting in errors and distortion of the flow information received in the control room, which affects the correct judgment of the flow.

[0003] Some rotor flow switches in the prior art are provided with a double-limit alarm device that can provide a preventive device for alarming the over-high and over-low flow conditions in addition to the direct on-site observation of the pointer and the observation of the monitoring data in the control room. Currently, many alarms use a non-contact detection method to detect the actual rotating position of the pointer to determine the flow, which can also be compared with the information transmitted to the control room. The non-contact detection method has the advantage of not contacting the pointer and not affecting the actual pointing direction of the pointer. However, the non-contact detection method also uses a large number of electronic components for control, and the position of the inductive pointer is mostly inducted by magnetic force or light. In the working environment of a factory, the non-contact alarm device is also at risk of being affected, and it does not fundamentally solve the dependence on electronic components. Compared with the non-contact alarm, the mechanical double-limit alarm device has a simple and reliable structure, and can be used as an alarm device for the flow of the rotor flow switch. The mechanical double-limit alarm method uses fewer electronic components and reduces the dependence on electronic components. The reason for setting the double-limit alarm switch is that the electronic monitoring transmission is unreliable, and the electronic double-limit alarm also has instability. Therefore, the mechanical double-limit alarm method is necessary.

[0004] The existing mechanical double-limit alarm mode can contact the pointer to determine whether the flow reaches the upper and lower limits, but the core problem of the mechanical double-limit alarm mode is that it can affect the normal rotation of the pointer and the accuracy of the pointer. The contact in the current mechanical double-limit alarm mode is divided into resettable and non-resettable, the resettable contact has elasticity, which can affect the accuracy of the pointer, and the non-resettable pointer needs to be reset manually after starting, and cannot alarm before manual reset. Both of these methods have certain risks, so a rotor flow switch using a mechanical double-limit alarm mode is needed, which can automatically reset the contact while reducing the impact on the accuracy of the pointer. SUMMARY

[0005] To overcome the above defects, the embodiments of the present application provide a mechanical double-limit alarm rotor flow switch, which solves the technical problems of the existing mechanical double-limit alarm device that the contact cannot be reset and the contact can affect the accuracy of the pointer.

[0006] A mechanical double-limit alarm rotor flow switch, comprising a watch head and a watch dial, the watch head is rotatably connected with a pointer, further comprising a mounting frame, an indicating needle assembly, an upper limit contact detection mechanism, a lower limit contact detection mechanism and a contact lever, the mounting frame is fixedly connected in the watch head, and the side close to the pointer is connected with the indicating needle assembly, the upper limit contact detection mechanism and the lower limit contact detection mechanism, the indicating needle assembly is used to indicate the upper limit and lower limit positions of the set flow on the watch dial, and simultaneously drives the upper limit contact detection mechanism and the lower limit contact detection mechanism to move to the upper limit and lower limit positions of the flow, the upper limit contact detection mechanism comprises an upper contact probe and a reset assembly, the lower limit contact detection mechanism comprises a lower contact probe and the reset assembly, the upper contact probe and the lower contact probe can contact the indicating needle assembly, the contact lever is fixedly connected on the pointer, the contact lever can push the upper contact probe or the lower contact probe to rotate, and electrical connection is generated when contacting, at this time, the upper contact probe or the lower contact probe is disconnected from the reset assembly, and the reset assembly can drive the upper contact probe or the lower contact probe to rotate after the contact lever is separated from the upper contact probe or the lower contact probe.

[0007] The indicating needle assembly comprises a first supporting arm, an upper limit indicating needle, a lower limit indicating needle and a pawl, the first supporting arm is fixedly connected on the mounting frame, the upper limit indicating needle is rotatably connected on the first supporting arm, the lower limit indicating needle is rotatably connected on the first supporting arm, a lever is fixedly connected on the upper limit indicating needle and the lower limit indicating needle, and a plurality of pawls are circumferentially arranged on the end of the upper limit indicating needle and the lower limit indicating needle rotatably connected with the first supporting arm, a clamping plate is slidably connected on the first supporting arm, and the clamping plate can engage with the pawls.

[0008] The upper contact probe and the lower contact probe are mirror-symmetrically arranged, the second supporting arm and the third supporting arm are fixedly connected to the mounting frame, and the upper contact probe and the lower contact probe are respectively rotatably connected to the second supporting arm and the third supporting arm.

[0009] The upper limit indicating needle can contact the upper contact probe, the lower limit indicating needle can contact the lower contact probe, the contact lever, the upper limit indicating needle and the lower limit indicating needle are respectively rotatable between the upper contact probe and the lower contact probe, the upper contact probe and the lower contact probe can be respectively driven to rotate by rotating the upper limit indicating needle and the lower limit indicating needle, the upper limit indicating needle is rotatable between the lower limit indicating needle and the upper contact probe, and the lower limit indicating needle is rotatable between the upper limit indicating needle and the lower contact probe.

[0010] Flexible wires are connected to the upper contact probe and the lower contact probe on the side close to the contact lever, and the contact lever is electrically connected to the flexible wires when the contact lever contacts the flexible wires.

[0011] The flexible wires can be in contact with the contact lever at all times, and the flexible wires can vibrate with the contact lever in the case of pointer vibration when the pointer rotates and pushes the flexible wires, the contact lever will not repeatedly hit the upper contact probe or the lower contact probe, causing excessive loss of the rotational kinetic energy of the pointer and reducing the influence on the accuracy of the pointer.

[0012] The reset assembly comprises a motor, a volute disc and a guide wheel disc, the motor is fixedly installed in the mounting frame, the volute disc is fixedly connected to the motor, a coil spring is arranged in the volute disc, an output end of the motor penetrates through the volute disc, the guide wheel disc is rotatably connected to the mounting frame and rotatably connected to the volute disc, the guide wheel disc is in transmission connection with the upper contact probe or the lower contact probe, a spring body groove is fixedly connected to one side of the volute disc close to the guide wheel disc, the spring body groove is annular, an opening is formed in the side of the spring body groove, the coil spring is arranged in the spring body groove, one end of the coil spring at the center is connected to the output end of the motor, one end of the coil spring outside the coil spring penetrates through the opening of the spring body groove, a baffle is fixedly connected to the guide wheel disc, the baffle can contact one end of the coil spring extending out of the spring body groove, a gap exists between the baffle and the spring body groove, and the coil spring can drive the guide wheel disc to rotate through the baffle.

[0013] When the contact lever is in contact with the flexible wire on the upper contact probe or the lower contact probe, the output end of the corresponding motor drives the coil spring to rotate, so that the coil spring is separated from the baffle, and at this time the contact lever can drive the upper contact probe or the lower contact probe to rotate.

[0014] The beneficial effects of the present application are:

[0015] The present application is different from the existing mechanical double-limit alarm device. The contact of the prior art does not have a reset function. After triggering, the contact needs to be reset manually. The contact with the reset function always has a pushing force, and the pointer needs to balance the pushing force, so it may affect the accuracy of the pointer. In the present application, the pointer is in contact with the upper contact probe and the lower contact probe before the upper contact probe and the lower contact probe are in contact with the upper contact probe and the lower contact probe. The upper contact probe and the lower contact probe are pushed to the upper limit position and the lower limit position specified by the upper limit pointer and the lower limit pointer. When the upper contact probe and the lower contact probe are in contact with the pointer, the reset assembly does not push the upper contact probe and the lower contact probe. The resistance of the pointer when pushing the upper contact probe and the lower contact probe to rotate is only the friction when rotating, reducing the influence on the rotating force of the pointer. The mechanical double-limit alarm can be performed without manual reset, avoiding the problem that the prior art cannot alarm before reset, and reducing the influence on the rotating accuracy of the pointer. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present application. Those skilled in the art can obtain other drawings according to the contents of the example embodiments of the present application and these drawings without creating any creative labor.

[0017] Figure 1 It is a whole structure schematic diagram of a mechanical double-limit alarm rotor flow switch in an embodiment of the present application.

[0018] Figure 2 It is a sectional view of the internal structure schematic diagram of the meter head in the present application.

[0019] Figure 3 It is a sectional view of the internal structure schematic diagram of the meter head in the present application.

[0020] Figure 4 It is a structure schematic diagram of the pointer assembly cooperating with the mounting frame in the present application.

[0021] Figure 5 It is a partial structure schematic diagram of the pointer assembly, the upper limit contact detection mechanism and the lower limit contact detection mechanism cooperating with each other in the present application.

[0022] Figure 6 Figure 3 is a partial cross-sectional view of the internal structure of the reset assembly and the mounting frame of the present application;

[0023] Figure 7 Figure 4 is a structural schematic view of the upper contact probe, the lower contact probe and the two reset assemblies of the present application;

[0024] Figure 8 Figure 5 is a structural schematic view of the volute disc and the guide wheel disc of the present application.

[0025] In the figure: 1, dial head; 2, dial plate; 3, pointer; 4, mounting frame; 5, upper contact probe; 6, lower contact probe; 7, contact lever; 8, arm 1; 9, upper limit indicating needle; 10, lower limit indicating needle; 11, clamping tooth; 12, clamping plate; 13, arm 2; 14, arm 3; 15, flexible wire; 16, motor; 17, volute disc; 18, coil spring; 19, guide wheel disc; 20, spring body slot; 21, stop piece; 22, damper. DETAILED DESCRIPTION

[0026] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not in any way limiting of the present application.

[0027] In order to make the drawing simple, only the parts related to the present application are shown in each figure, which do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some figures, only one of the parts with the same structure or function is shown, or only one of them is marked. In this text, “one” not only means “only one”, but also means “more than one”, and “several” includes “two” and “more than two”.

[0028] In this text, it should be noted that, unless otherwise specified and limited, the terms “mounting”, “connection” and “connection” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0030] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] Embodiment one

[0033] As Figures 1-8The diagram illustrates a rotor flow switch with mechanical dual-limit alarm according to an embodiment of the present invention. It includes a meter head 1 and a dial 2. A pointer 3 is rotatably connected to the meter head 1. The meter head 1 also includes a mounting bracket 4, an indicator needle assembly, an upper limit contact detection mechanism, a lower limit contact detection mechanism, and a contact lever 7. The mounting bracket 4 is fixedly connected to the meter head 1. The indicator needle assembly, upper limit contact detection mechanism, and lower limit contact detection mechanism are connected to the side closest to the pointer 3. The indicator needle assembly indicates the upper and lower limit flow rate positions set on the dial 2, and simultaneously drives the upper and lower limit contact detection mechanisms to the upper and lower limit flow rate positions, respectively. The upper limit contact detection mechanism includes an upper contact probe 5 and a reset assembly, and the lower limit contact detection mechanism includes a lower contact probe 6 and a reset assembly. Both the upper and lower contact probes 5 and 6 can contact the indicator needle assembly. The contact lever 7 is fixedly connected to the pointer 3 and can push... When the upper contact probe 5 or the lower contact probe 6 rotates and makes contact, an electrical connection is formed. At this time, the upper contact probe 5 or the lower contact probe 6 is disconnected from the transmission connection with the reset component. When the contact lever 7 is separated from the upper contact probe 5 or the lower contact probe 6, the reset component can drive the upper contact probe 5 or the lower contact probe 6 to rotate. In this application, the actual flow rate is calculated by a component externally mounted on the dial 2 to detect the pointer. The actual position of the pointer 3 is determined by mechanically contacting the contact lever 7 on the pointer 3. This avoids the situation where too many electronic components are easily affected by the environment, which may lead to the distortion of the flow data transmission. The pointer component is used to visually calibrate the set upper and lower limits, and at the same time limit the position of the upper contact probe 5 and the lower contact probe 6, so that the pointer 3 will only contact the upper contact probe 5 or the lower contact probe 6 when it rotates to the upper or lower limit, triggering the alarm.

[0034] like Figures 1-5 As shown, the indicator assembly includes a support arm 8, an upper limit indicator 9, a lower limit indicator 10, and locking teeth 11. The support arm 8 is fixedly connected to the mounting bracket 4. The upper limit indicator 9 is rotatably connected to the support arm 8, and the lower limit indicator 10 is rotatably connected to the support arm 8. A lever is fixedly connected to both the upper limit indicator 9 and the lower limit indicator 10. Multiple locking teeth 11 are circumferentially arranged at the ends of the upper limit indicator 9 and the lower limit indicator 10 that are rotatably connected to the support arm 8. A locking plate 12 is slidably connected to the support arm 8, and the locking plate 12 can engage with the locking teeth 11. A transparent cover is provided on the meter head 1. Figure 1 As shown, opening the watch cover allows for direct adjustment of the indicator assembly, such as... Figure 2As shown, the upper limit indicator 9 and the lower limit indicator 10 are respectively provided with a stop bar that can contact the upper contact probe 5 and the lower contact probe 6, so that when the upper limit indicator 9 and the lower limit indicator 10 are rotated, the upper contact probe 5 and the lower contact probe 6 are pushed at the same time, and the angle is fixed by the locking teeth 11 and the locking plate 12 to prevent the upper limit indicator 9 and the lower limit indicator 10 from rotating due to vibration or other reasons.

[0035] like Figures 2-5 As shown, the upper contact probe 5 and the lower contact probe 6 are mirror-oriented. The mounting bracket 4 is fixedly connected with the second support arm 13 and the third support arm 14. The upper contact probe 5 and the lower contact probe 6 are rotatably connected on the second support arm 13 and the third support arm 14, respectively. In this embodiment, the first support arm 8, the second support arm 13 and the third support arm 14 are arranged sequentially above the dial 2. Adjusting the upper limit indicator needle 9 and the lower limit indicator needle 10 will not affect the rotation of the pointer 3.

[0036] like Figures 2-5 As shown, the upper limit indicator 9 can contact the upper contact probe 5, and the lower limit indicator 10 can contact the lower contact probe 6. The contact lever 7, the upper limit indicator 9, and the lower limit indicator 10 rotate between the upper contact probe 5 and the lower contact probe 6, respectively. By rotating the upper limit indicator 9 and the lower limit indicator 10, the upper contact probe 5 and the lower contact probe 6 can be rotated respectively. The upper limit indicator 9 rotates between the lower limit indicator 10 and the upper contact probe 5, and the lower limit indicator 10 rotates between the upper limit indicator 9 and the lower contact probe 6. The pointer 3 can set the upper and lower limits respectively by rotating between the upper contact probe 5 and the lower contact probe 6. Contact with the flexible wire 15 can determine that the alarm line has been reached.

[0037] like Figures 5-7 As shown, flexible wires 15 are connected to the side of the upper contact probe 5 and the lower contact probe 6 near the contact lever 7. The contact lever 7 is electrically connected to the flexible wire 15 when in contact. The contact between the flexible wire 15 and the contact lever 7 avoids the conductive triggering caused by contact with a rigid metal rod in traditional mechanical dual-limit alarms. In cases where the pointer 3 is prone to inaccurate detection due to vibration, the flexible wire 15 can always be in contact with the contact lever 7. At the same time, when the pointer 3 rotates and pushes the flexible wire 15, the flexible wire 15 can vibrate with the contact lever 7 when the pointer 3 vibrates. The contact lever 7 will not repeatedly strike the upper contact probe 5 or the lower contact probe 6, causing excessive loss of the kinetic energy of the pointer 3 and reducing the impact on the accuracy of the pointer 3. The flexible wire 15 is electrically connected to the alarm device in the meter head 1 and an alarm is triggered when in contact.

[0038] like Figures 6-8As shown, the reset assembly comprises a motor 16, a volute disc 17 and a guide wheel disc 19, the motor 16 is fixedly installed in the mounting frame 4, the volute disc 17 is fixedly connected on the motor 16, the volute disc 17 is provided with a coil spring 18, the output end of the motor 16 penetrates through the volute disc 17, the guide wheel disc 19 is rotatably connected on the mounting frame 4 and rotatably connected with the volute disc 17, the guide wheel disc 19 is drivingly connected with the upper contact probe 5 or the lower contact probe 6, the side of the volute disc 17 close to the guide wheel disc 19 is fixedly connected with a spring body groove 20, the spring body groove 20 is annular, the spring body groove 20 is provided with an opening at the side, the coil spring 18 is arranged in the spring body groove 20, one end of the coil spring 18 at the center is connected with the output end of the motor 16, the other end of the coil spring 18 at the outside penetrates through the opening of the spring body groove 20, the guide wheel disc 19 is fixedly connected with a baffle 21, the baffle 21 can contact with the end of the coil spring 18 extending out of the spring body groove 20, there is a gap between the baffle 21 and the spring body groove 20, the coil spring 18 can push the guide wheel disc 19 to rotate through the baffle 21, the surface of the volute disc 17 is fixed with the motor 16, the output end only drives the coil spring 18 in the spring body groove 20 to rotate, the end of the coil spring 18 extending out of the spring body groove 20 is provided with a bend, when the coil spring 18 rotates and tightens, the bent end is clamped at the opening of the spring body groove 20 and cannot enter into the spring body groove 20, and cannot contact with the baffle 21, when the motor 16 reversely rotates and loosens the coil spring 18, the bent end pushes the baffle 21 due to the elastic force of the coil spring 18, the guide wheel disc 19 drives the upper contact probe 5 or the lower contact probe 6 to rotate through the synchronous belt, until the upper limit indicating needle 9 or the lower limit indicating needle 10 is contacted.

[0039] As Figures 6-8 shown, when the contact lever 7 contacts with the flexible wire 15 on the upper contact probe 5 or the lower contact probe 6, the output end of the corresponding motor 16 drives the coil spring 18 to rotate, so that the coil spring 18 is separated from the baffle 21, at this time, the contact lever 7 can drive the upper contact probe 5 or the lower contact probe 6 to rotate.

[0040] In this embodiment, by adjusting the levers on the upper limit indicator 9 and the lower limit indicator 10 to the set upper and lower limits of the flow direction, the sliding plate 12 fixes the locking teeth 11. When the upper limit indicator 9 and the lower limit indicator 10 rotate, they drive the upper contact probe 5 and the lower contact probe 6 to rotate. When the pointer 3 rotates to the upper or lower limit, the contact lever 7 contacts the flexible wire 15 on the upper contact probe 5 or the lower contact probe 6 and conducts electricity. The electrical signal controls the output end of the motor 16 to rotate and simultaneously triggers an alarm. The output end of the motor 16 drives the coil spring 18 to tighten in the spring groove 20 so that it separates from the baffle 21. At this time, the upper contact probe 5 or the lower contact probe 6 can rotate under the push of the contact lever 7, and when rotating, it only drives the guide wheel 19 to rotate and does not apply pressure to the coil spring 18. When the contact lever 7 separates from the coil spring 18, the motor 16 flips so that the coil spring 18 can push the baffle 21, thereby causing the upper contact probe 5 and the lower contact probe 6 to rotate to the position where they contact the upper limit indicator 9 and the lower limit indicator 10 respectively to wait for the subsequent alarm.

[0041] Example 2

[0042] like Figures 7-8 As shown, another embodiment of the present invention is illustrated. A damper 22 is provided on the output end of the motor 16. The output end of the motor 16 drives the coil spring 18 to rotate through the damper 22. When the contact lever 7 contacts the flexible wire 15, the output end of the motor 16 continues to rotate, driving the coil spring 18 to remain in a tightened state through the damper 22, preventing it from contacting the baffle 21. When the contact lever 7 is not in contact with the flexible wire 15, the coil spring 18 pushes the baffle 21 and simultaneously pushes the damper 22. The damper 22 can rotate, allowing the coil spring 18 to remain in a natural state and not probe the upper contact point. Applying a pushing force to the needle 5 or the lower contact probe 6 can extend the life of the coil spring 18. On the other hand, when the reset mechanism or other electronic components such as the flexible wire 15 malfunction, the contact lever 7 will rotate when it contacts the upper contact probe 5 or the lower contact probe 6, thereby pushing the coil spring 18. The coil spring 18 can further push the damper 22 to rotate, reducing the pushing force of the upper contact probe 5 or the lower contact probe 6 on the contact lever 7, forming an elastic contact. This serves as a structure to prevent the pointer 3 from being jammed by the upper contact probe 5 or the lower contact probe 6 and unable to rotate, thus preventing damage.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rotor flow switch with mechanical dual-limit alarm, comprising a meter head (1) and a dial (2), wherein a pointer (3) is rotatably connected in the meter head (1), characterized in that, Also includes: Mounting bracket (4) is fixedly connected to the meter head (1). On the side near the pointer (3), there is an indicator needle assembly, an upper limit contact detection mechanism and a lower limit contact detection mechanism. The indicator needle assembly is used to indicate the upper limit and lower limit scale of the flow on the dial (2), and at the same time, it drives the upper limit contact detection mechanism and the lower limit contact detection mechanism to move to the upper limit and lower limit positions of the flow, respectively. The upper limit contact detection mechanism includes an upper contact probe (5) and a reset component, and the lower limit contact detection mechanism includes a lower contact probe (6) and the reset component. Both the upper contact probe (5) and the lower contact probe (6) can contact the indicator needle component, and the reset component can be drivenly connected to the contact probe. A contact lever (7) is fixedly connected to the pointer (3). The contact lever (7) can push the upper contact probe (5) or the lower contact probe (6) to rotate, and an electrical connection is generated when they are in contact. At this time, the upper contact probe (5) or the lower contact probe (6) is disconnected from the reset assembly. When the contact lever (7) is separated from the upper contact probe (5) or the lower contact probe (6), the reset assembly can drive the upper contact probe (5) or the lower contact probe (6) to rotate. Flexible wires (15) are connected to the side of the upper contact probe (5) and the lower contact probe (6) near the contact lever (7), and the contact lever (7) is electrically connected to the flexible wires (15) when in contact. The reset component includes: The motor (16) is fixedly installed in the mounting bracket (4); A spiral disk (17) is fixedly connected to the motor (16). A coil spring (18) is provided in the spiral disk (17). The output end of the motor (16) passes through the spiral disk (17). The guide wheel disk (19) is rotatably connected inside the mounting bracket (4) and rotatably connected to the worm disk (17). The guide wheel disk (19) is drivenly connected to the upper contact probe (5) or the lower contact probe (6). The worm gear disk (17) is fixedly connected to a spring groove (20) on the side near the guide wheel disk (19). The spring groove (20) is annular and has an opening on the side. The coil spring (18) is disposed in the spring groove (20). One end of the center of the coil spring (18) is connected to the output end of the motor (16), and one end of the outer side of the coil spring (18) passes through the opening of the spring groove (20).

2. The rotor flow switch with mechanical dual-limit alarm according to claim 1, characterized in that, The indicator assembly includes: Support arm 1 (8) is fixedly connected to the mounting bracket (4); The upper limit indicator (9) is rotatably connected to the first arm (8); The lower limit indicator (10) is rotatably connected to the first support arm (8), and the upper limit indicator (9) and the lower limit indicator (10) are respectively fixedly connected with levers; The upper limit indicator (9) and the lower limit indicator (10) are rotatably connected to the support arm (8) and are provided with multiple circumferentially arranged teeth (11). The support arm (8) is slidably connected to a plate (12) which can engage with the teeth (11).

3. The rotor flow switch with mechanical dual-limit alarm according to claim 2, characterized in that, The upper contact probe (5) and the lower contact probe (6) are mirror-oriented. The mounting bracket (4) is fixedly connected with the second support arm (13) and the third support arm (14). The upper contact probe (5) and the lower contact probe (6) are rotatably connected to the second support arm (13) and the third support arm (14) respectively.

4. A rotor flow switch with mechanical dual-limit alarm according to claim 3, characterized in that, The upper limit indicator (9) can contact the upper contact probe (5), and the lower limit indicator (10) can contact the lower contact probe (6). The contact lever (7), the upper limit indicator (9), and the lower limit indicator (10) rotate between the upper contact probe (5) and the lower contact probe (6), respectively. By rotating the upper limit indicator (9) and the lower limit indicator (10), the upper contact probe (5) and the lower contact probe (6) can be driven to rotate, respectively.

5. A rotor flow switch with mechanical dual-limit alarm according to claim 4, characterized in that, A baffle plate (21) is fixedly connected in the guide wheel disk (19). The baffle plate (21) can contact one end of the coil spring (18) that extends out of the spring body groove (20). There is a gap between the baffle plate (21) and the spring body groove (20). The coil spring (18) can push the guide wheel disk (19) to rotate through the baffle plate (21).

6. A rotor flow switch with mechanical dual-limit alarm according to claim 5, characterized in that, When the contact lever (7) comes into contact with the flexible wire (15) on the upper contact probe (5) or the lower contact probe (6), the output end of the corresponding motor (16) drives the coil spring (18) to rotate, so that the coil spring (18) separates from the baffle (21). At this time, the contact lever (7) can drive the upper contact probe (5) or the lower contact probe (6) to rotate.

7. A rotor flow switch with mechanical dual-limit alarm according to claim 4, characterized in that, The upper limit indicator (9) rotates between the lower limit indicator (10) and the upper contact probe (5), and the lower limit indicator (10) rotates between the upper limit indicator (9) and the lower contact probe (6).

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