Electric device for valve float braking
By linking the three-stage float structure with the braking mechanism, the automatic adjustment of the liquid level and the linkage of power transmission of the float valve are realized, which solves the problem of dry pumping when the liquid level is too low and improves the automation and reliability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGZHOU INST OF LIGHT IND TECH
- Filing Date
- 2026-04-29
- Publication Date
- 2026-06-05
Smart Images
Figure CN122148805A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of valve braking technology, and in particular to an electric device for braking a valve float. Background Technology
[0002] In fluid transport and control systems, valves are key actuators, widely used in water conservancy, chemical industry, municipal water supply, and industrial circulating water. For applications requiring automatic control of liquid level or flow, float valves or electric valves are typically used to achieve the opening, closing, and regulation of the medium. Float valves utilize changes in liquid level to drive the float, which in turn opens or closes the valve core. They have the advantages of simple structure and no need for external power. Electric valves, on the other hand, are driven by a motor, enabling remote control and precise regulation, but they cannot operate independently in the absence of power or when the control system fails.
[0003] In existing technologies, there have been attempts to combine float mechanisms with electric actuators, aiming to balance the automatic response of the float with the controllability of the electric actuator. However, such combined devices still have the following technical problems in practical applications: First, there is a lack of an effective anti-dry-run protection mechanism. During liquid transportation, if the liquid level in the storage tank or pipeline connected to the valve is too low, and the transfer pump continues to operate, air will be drawn into the pump body, causing dry-running. This not only causes a sharp drop in transportation efficiency but may also damage components such as impellers, bearings, and mechanical seals due to dry friction, seriously affecting the equipment's lifespan and operational reliability. Although existing float valves can close the inlet as the liquid level drops, it is difficult to directly control the power input of the transfer pump and cannot actively cut off the pump's drive when the liquid level is too low; Second, the coordination between the inlet speed and the liquid level control is insufficient. In applications requiring stable liquid levels or overflow prevention, traditional float valves typically employ a single float to drive the valve core. The opening change is either step-like or linearly monotonically variable, making it difficult to achieve segmented regulation functions such as gradually reducing the inlet flow when the liquid level is too high, completely cutting off the inlet flow when the liquid level is too high, and automatically resuming the inlet flow after the liquid level recovers. When the inlet flow rate is large, the float response is lag-dependent, easily leading to drastic liquid level fluctuations or exceeding the set range. Thirdly, there is a lack of linkage design between the float and the braking and conveying mechanisms. In existing technologies, float movement is mostly used only to control the inlet valve, while the start / stop of the conveying pump or power transmission usually relies on an independent control system, increasing system complexity and potential failure points. If the float displacement could be used simultaneously for inlet regulation and power transmission braking control, fully automatic protection under mechanical linkage could be achieved, improving system integration and reliability. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention discloses an integrated electric device capable of simultaneously regulating the inlet speed and providing braking protection for the conveying power through float linkage. The technical solution adopted by this invention is as follows: an electric device for valve float braking, comprising a main body mechanism for adjusting the inlet speed of the valve, the main body mechanism including a valve housing, and a braking mechanism for braking the valve and a conveying mechanism for conveying fluid are provided within the main body mechanism.
[0005] Furthermore, the main body also includes an inner buoyancy box fixedly installed inside the valve housing. A lower thin column is fixedly installed inside the inner buoyancy box. A middle thick column is fixedly installed on the lower thin column. An upper thin column is fixedly installed on the middle thick column. The upper thin column is fixedly installed to the inner buoyancy box. A lower float is slidably installed on the lower thin column. A large float is slidably installed on the middle thick column.
[0006] Furthermore, the main structure also includes an inflow pipe fixedly installed on the top of the inner buoyancy box, a switch housing fixedly installed on the inflow pipe, a switch horizontal plate slidably installed inside the switch housing, a switch rotating rod rotatably installed on the switch horizontal plate, and an upper floating plate slidably installed on the upper thin column, with the upper floating plate and the switch rotating rod rotatably installed together.
[0007] Furthermore, the main body also includes an inlet pipe fixedly installed on the switch housing, the inlet pipe being fixedly installed on the valve housing, a connecting pipe fixedly installed on the inner buoyancy box, a bottom support fixedly installed at the bottom of the valve housing, the inlet pipe communicating with the switch housing, the switch housing communicating with the inflow pipe, the inflow pipe communicating with the inner buoyancy box, and the inner buoyancy box communicating with the connecting pipe.
[0008] The external liquid pipeline is connected to the inlet pipeline. The liquid enters the impeller housing through the inlet pipeline, the switch housing, and the inflow pipeline. Then, the liquid in the inner buoyancy tank is pumped into the impeller housing through the connecting pipeline by the conveying mechanism. Finally, it is discharged through the outlet pipeline, which is connected to the external pipeline.
[0009] Initially, the large float presses down, holding the lower float in place. As liquid enters the inner buoyancy tank, the liquid level rises. This rise in liquid level causes the large and lower floats to rise due to buoyancy. The lower float rises until it contacts the central thick column, at which point it can no longer rise. The large float rises to the outside of the central thick column and continues to rise along it. As the liquid level in the inner buoyancy tank continues to rise, when the large float contacts the upper float, it indicates that the liquid level in the inner buoyancy tank is too high, and the amount of liquid entering the tank needs to be reduced. The large float will then push the upper float upwards. The upper float, through the switch lever, moves the switch plate outwards. When the switch plate moves inside the switch housing, it first narrows the flow channel of the switch housing to reduce the amount of liquid entering the inner buoyancy tank. If the large float and the upper float continue to rise, they will cause the switch plate to close the switch housing, at which point the liquid can no longer enter the inner buoyancy tank. As the liquid level in the inner buoyancy tank drops, the large float and the upper float will descend, at which point the switch plate will slowly open the switch housing, and the liquid will continue to enter the inner buoyancy tank. That is, when the liquid level in the inner buoyancy tank is higher than a certain value, the speed at which the liquid enters the inner buoyancy tank will be automatically reduced until it stops entering. When the liquid level in the inner buoyancy tank drops, the liquid entry will resume.
[0010] Furthermore, the braking mechanism includes two sliding grooves disposed within the inner buoyancy box, a sealing plug is slidably installed in the sliding groove, a lower rack is fixedly installed on the sealing plug, a lower rotating rod is rotatably installed on the lower rack, and the lower rotating rod is rotatably installed with the lower float.
[0011] Furthermore, the braking mechanism also includes a central gear and an upper gear rotatably mounted on the inner buoyancy box. The central gear meshes with the upper gear, and the lower rack meshes with the central gear. A brake lever is slidably mounted on the inner buoyancy box, and an upper rack is fixedly mounted on the brake lever. The upper rack meshes with the upper gear. A groove is provided at the end of the brake lever, and a friction plate is provided in the groove.
[0012] When the liquid level in the inner buoyancy tank is low, the large float plate presses down the lower float plate. At this time, the friction pad in the groove of the brake lever is tightly fitted with the brake wheel, making it difficult for the brake wheel to rotate. At this time, the passive friction wheel and the active friction wheel slip, preventing the situation of dry pumping due to the low liquid level in the inner buoyancy tank. As the liquid level in the inner buoyancy tank rises, the buoyancy drives the large float plate and the lower float plate to rise. The lower float plate drives the lower rack and sealing plug to slide inward through the lower rotating rod, driving the central rotating gear to rotate. The central rotating gear drives the upper gear to rotate, and the upper gear drives the brake lever away from the brake wheel, causing the brake lever to disengage from the brake wheel. At this time, the passive friction wheel and the active friction wheel no longer slip. As the lower float plate continues to rise, the brake lever continues to move away from the brake wheel. When the lower float plate rises to contact the bottom of the middle thick column, the lower float plate can no longer rise. At this time, the position of the brake lever remains stationary.
[0013] Furthermore, the conveying mechanism includes an impeller housing fixedly installed inside the valve housing, the impeller housing being fixedly installed with a connecting pipe and communicating with the impeller housing, an output pipe being fixedly installed on the impeller housing and communicating with the impeller housing, the output pipe being fixedly installed with the valve housing, and a main impeller being rotatably installed inside the impeller housing.
[0014] Furthermore, the conveying mechanism also includes an impeller shaft fixedly mounted on the main impeller, a brake wheel and a passive friction wheel fixedly mounted on the impeller shaft, an input shaft rotatably mounted on the valve housing, an active friction wheel fixedly mounted on the input shaft, the input shaft being connected to an external power source, and the active friction wheel and the passive friction wheel forming a friction drive.
[0015] During normal use, the external power source drives the input shaft to rotate, which in turn drives the active friction wheel to rotate. The active friction wheel, through friction transmission, drives the passive friction wheel, impeller shaft, brake wheel, and main impeller to rotate. The main impeller draws the liquid in the inner buoyancy tank into the impeller housing through the connecting pipe, and then outputs it through the output pipe. In the initial state, the liquid level in the inner buoyancy tank is low, and the brake lever locks the brake wheel through the friction plate. At this time, the active friction wheel rotates, the passive friction wheel slips, and the main impeller does not rotate. When the brake lever disengages from the brake wheel, the active friction wheel begins to drive the passive friction wheel and the main impeller to rotate.
[0016] The beneficial effects of this invention compared with the prior art are: (1) By setting a braking mechanism linked with the lower float, when the liquid level in the inner buoyancy box is too low, the large float will press down the lower float. Through the transmission of the lower rotating rod, the lower rack, the middle rotating gear and the upper gear, the brake lever is driven to make the friction plate in the groove of the brake wheel fit tightly with the brake wheel, thereby locking the brake wheel. At this time, the active friction wheel and the passive friction wheel slip, and the external power source cannot drive the main impeller to rotate, thus realizing the mechanical automatic stop of the conveying mechanism. This structure does not rely on external electrical detection components, avoiding the problems of impeller idling, dry friction and seal damage caused by low liquid level; (2) The main structure of this invention adopts a three-stage float structure of lower float, large float and upper float, which, together with the switch cross plate in the switch housing, forms a segmented liquid inlet control. When the liquid level in the inner buoyancy box rises, the large float pushes the upper float to rise, and drives the switch cross plate to move in the switch housing through the switch rod. First, the flow channel cross section is reduced to reduce the liquid inlet speed. If the liquid level continues to rise, the switch cross plate will completely seal the switch housing and cut off the liquid inlet. When the liquid level drops, the switch cross plate will... The plate can gradually open to restore liquid intake, realizing closed-loop regulation of decelerating liquid intake when the liquid level is too high, cutting off liquid intake when the liquid level is too high, and automatically restoring after the liquid level is restored; (3) This invention uses the upper float to link the liquid intake adjustment mechanism and the lower float to link the braking mechanism, so that the same set of float system can simultaneously control the liquid intake flow and start / stop control the transmission of conveying power according to the liquid level change. The two sets of mechanisms share the float components in the inner buoyancy box, which is compact and reliable. No additional sensors, controllers or actuators are required, which reduces the system complexity and manufacturing cost, while improving the integration and automation level of the whole machine. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.
[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention (internal).
[0019] Figure 3 This is a schematic diagram of the main structure of the present invention. Figure 1 .
[0020] Figure 4 This is a schematic diagram of the main structure of the present invention. Figure 2 .
[0021] Figure 5 This is a schematic diagram of the braking mechanism structure of the present invention. Figure 1 .
[0022] Figure 6 This is a schematic diagram of the braking mechanism structure of the present invention. Figure 2 .
[0023] Figure 7This is a schematic diagram of the conveying mechanism structure of the present invention. Figure 1 .
[0024] Figure 8 This is a schematic diagram of the conveying mechanism structure of the present invention. Figure 2 .
[0025] Reference numerals: 101-Valve housing; 102-Bottom support; 103-Inner buoyancy box; 104-Inlet pipe; 105-Switch housing; 106-Inflow pipe; 107-Connecting pipe; 108-Intermediate thick column; 109-Lower thin column; 110-Upper thin column; 111-Lower float plate; 112-Large float plate; 113-Upper float plate; 114-Switch horizontal plate; 115-Switch lever; 2 01-Lower rack; 202-Sealing plug; 203-Sliding groove; 204-Lower rotating rod; 205-Intermediate gear; 206-Upper gear; 207-Brake lever; 208-Upper rack; 301-Impeller housing; 302-Output pipe; 303-Main impeller; 304-Impeller shaft; 305-Brake wheel; 306-Passive friction wheel; 307-Input shaft; 308-Active friction wheel. Detailed Implementation
[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0027] Example: Reference Figures 1-8 An electric device for braking a valve float includes a main body mechanism for adjusting the inlet speed of the valve. The main body mechanism includes a valve housing 101, and a braking mechanism for braking the valve and a conveying mechanism for conveying fluid are provided inside the main body mechanism.
[0028] like Figure 3 , Figure 4 As shown, the main structure also includes an inner buoyancy box 103 fixedly installed inside the valve housing 101. A lower thin column 109 is fixedly installed inside the inner buoyancy box 103. A middle thick column 108 is fixedly installed on the lower thin column 109. An upper thin column 110 is fixedly installed on the middle thick column 108. The upper thin column 110 is fixedly installed with the inner buoyancy box 103. A lower float 111 is slidably installed on the lower thin column 109. A large float 112 is slidably installed on the middle thick column 108.
[0029] like Figure 3 , Figure 4 As shown, the main structure also includes an inflow pipe 106 fixedly installed on the top of the inner buoyancy box 103. A switch housing 105 is fixedly installed on the inflow pipe 106. A switch horizontal plate 114 is slidably installed inside the switch housing 105. A switch rotating rod 115 is rotatably installed on the switch horizontal plate 114. An upper float plate 113 is slidably installed on the upper thin column 110. The upper float plate 113 and the switch rotating rod 115 are rotatably installed.
[0030] like Figure 3 , Figure 4 As shown, the main structure also includes an inlet pipe 104 fixedly installed on the switch housing 105. The inlet pipe 104 is fixedly installed on the valve housing 101. A connecting pipe 107 is fixedly installed on the inner buoyancy box 103. A bottom support 102 is fixedly installed at the bottom of the valve housing 101. The inlet pipe 104 is connected to the switch housing 105. The switch housing 105 is connected to the inflow pipe 106. The inflow pipe 106 is connected to the inner buoyancy box 103. The inner buoyancy box 103 is connected to the connecting pipe 107.
[0031] An external liquid pipe is connected to an inlet pipe 104. Liquid enters the impeller housing 301 through the inlet pipe 104, the switch housing 105, and the inflow pipe 106. Then, the liquid in the inner buoyancy box 103 is drawn into the impeller housing 301 through the connecting pipe 107 by the conveying mechanism. Finally, the liquid is discharged through the outlet pipe 302, which is connected to the external pipe.
[0032] Initially, the large float 112 presses down, holding down the lower float 111. As liquid enters the inner buoyancy tank 103, the liquid level in the inner buoyancy tank 103 rises. This rise in liquid level causes the large float 112 and the lower float 111 to rise due to buoyancy. The lower float 111 rises until it contacts the central thick column 108 and can no longer rise. The large float 112 rises to the outside of the central thick column 108 and continues to rise along it. As the liquid level in the inner buoyancy tank 103 continues to rise, when the large float 112 contacts the upper float 113, it indicates that the liquid level in the inner buoyancy tank 103 is too high, and the amount of liquid entering the inner buoyancy tank 103 needs to be reduced. The large float 112 will then push the upper float 113 upward. The upper float 113, through the switch lever 115, drives the switch plate 11. 4. When the switch plate 114 moves outward within the switch housing 105, it first narrows the flow channel of the switch housing 105 to reduce the amount of liquid entering the inner buoyancy box 103. If the large float 112 and the upper float 113 continue to rise, they will cause the switch plate 114 to close the switch housing 105, at which point the liquid can no longer enter the inner buoyancy box 103. As the liquid level in the inner buoyancy box 103 decreases, the large float 112 and the upper float 113 will descend. At this time, the switch plate 114 slowly opens the switch housing 105, and the liquid continues to enter the inner buoyancy box 103. That is, when the liquid level in the inner buoyancy box 103 is higher than a certain value, the speed at which the liquid enters the inner buoyancy box 103 is automatically reduced until it stops entering. When the liquid level in the inner buoyancy box 103 decreases, the liquid entry resumes.
[0033] like Figure 5 , Figure 6As shown, the braking mechanism includes two sliding grooves 203 disposed in the inner buoyancy box 103. A sealing plug 202 is slidably installed in the sliding groove 203. A lower rack 201 is fixedly installed on the sealing plug 202. A lower rotating rod 204 is rotatably installed on the lower rack 201. The lower rotating rod 204 is rotatably installed with the lower float 111.
[0034] like Figure 5 , Figure 6 As shown, the braking mechanism also includes a central gear 205 and an upper gear 206 rotatably mounted on the inner buoyancy box 103. The central gear 205 meshes with the upper gear 206, and the lower rack 201 meshes with the central gear 205. A brake lever 207 is slidably mounted on the inner buoyancy box 103. An upper rack 208 is fixedly mounted on the brake lever 207. The upper rack 208 meshes with the upper gear 206. A groove is provided at the end of the brake lever 207, and a friction plate is provided in the groove.
[0035] When the liquid level in the inner buoyancy tank 103 is very low, the large float 112 presses down the lower float 111. At this time, the friction plate in the groove of the brake lever 207 is tightly fitted with the brake wheel 305, making it difficult for the brake wheel 305 to rotate. At this time, the passive friction wheel 306 and the active friction wheel 308 slip, preventing the situation of dry pumping due to the low liquid level in the inner buoyancy tank 103. As the liquid level in the inner buoyancy tank 103 rises, the buoyancy drives the large float 112 and the lower float 111 to rise. The lower float 111 drives the lower rack 201 and the sealing plug 202 through the lower rotating rod 204. Sliding inwards, the central gear 205 rotates, which in turn drives the upper gear 206 to rotate. The upper gear 206 then drives the brake lever 207 away from the brake wheel 305, causing the brake lever 207 to disengage from the brake wheel 305. At this point, the passive friction wheel 306 and the active friction wheel 308 no longer slip. As the lower float 111 continues to rise, the brake lever 207 continues to move away from the brake wheel 305. When the lower float 111 rises to contact the bottom of the central thick post 108, it can no longer rise, and the position of the brake lever 207 remains unchanged.
[0036] like Figure 7 , Figure 8 As shown, the conveying mechanism includes an impeller housing 301 fixedly installed inside the valve housing 101. The impeller housing 301 is fixedly installed with the connecting pipe 107, which is connected to the impeller housing 301. An output pipe 302 is fixedly installed on the impeller housing 301, which is connected to the impeller housing 301 and is fixedly installed with the valve housing 101. A main impeller 303 is rotatably installed inside the impeller housing 301.
[0037] like Figure 7 , Figure 8As shown, the conveying mechanism also includes an impeller shaft 304 fixedly mounted on the main impeller 303. A brake wheel 305 and a passive friction wheel 306 are fixedly mounted on the impeller shaft 304. An input shaft 307 is rotatably mounted on the valve housing 101. An active friction wheel 308 is fixedly mounted on the input shaft 307. The input shaft 307 is connected to an external power source. The active friction wheel 308 and the passive friction wheel 306 form a friction drive.
[0038] During normal use, the external power source drives the input shaft 307 to rotate, which in turn drives the active friction wheel 308 to rotate. The active friction wheel 308 drives the passive friction wheel 306, impeller shaft 304, brake wheel 305, and main impeller 303 to rotate via friction transmission. The main impeller 303 draws the liquid in the inner buoyancy box 103 from the connecting pipe 107 into the impeller housing 301, and then outputs it from the output pipe 302. In the initial state, the liquid level in the inner buoyancy box 103 is low, and the brake lever 207 holds the brake wheel 305 in place through the friction plate. At this time, the active friction wheel 308 rotates, the passive friction wheel 306 slips, and the main impeller 303 does not rotate. When the brake lever 207 disengages from the brake wheel 305, the active friction wheel 308 begins to drive the passive friction wheel 306 and the main impeller 303 to rotate.
[0039] Working principle: The external liquid pipeline is connected to the inlet pipeline 104. The liquid enters the impeller housing 301 through the inlet pipeline 104, the switch housing 105, and the inflow pipeline 106. The external power source drives the input shaft 307 to rotate. The input shaft 307 drives the active friction wheel 308 to rotate. The active friction wheel 308 drives the passive friction wheel 306, the impeller shaft 304, the brake wheel 305, and the main impeller 303 to rotate through friction transmission. The main impeller 303 draws the liquid in the inner buoyancy box 103 from the connecting pipeline 107 into the impeller housing 301, and then outputs it from the output pipeline 302. The output pipeline 302 is connected to the external pipeline.
[0040] Initially, the liquid level in the inner buoyancy tank 103 is low, and the large float 112 presses down the lower float 111. At this time, the friction plate in the groove of the brake lever 207 is tightly engaged with the brake wheel 305, making it difficult for the brake wheel 305 to rotate. The passive friction wheel 306 and the active friction wheel 308 slip, preventing the inner buoyancy tank 103 from becoming too low and causing a dry run. As the liquid level in the inner buoyancy tank 103 rises, the buoyancy drives the large float 112 and the lower float 111 to rise. The lower float 111 drives the lower rack 201 and the sealing plug 20 via the lower rotating rod 204. 2. Sliding inwards, the central gear 205 rotates, which in turn drives the upper gear 206 to rotate. The upper gear 206 then drives the brake lever 207 away from the brake wheel 305, causing the brake lever 207 to disengage from the brake wheel 305. At this point, the passive friction wheel 306 and the active friction wheel 308 no longer slip. As the lower float 111 continues to rise, the brake lever 207 continues to move away from the brake wheel 305. When the lower float 111 rises to contact the bottom of the central thick column 108, it can no longer rise, and the brake lever 207 remains stationary. At this point, the active friction wheel 308 rotates, the passive friction wheel 306 slips, and the main impeller 303 does not rotate. After the brake lever 207 disengages from the brake wheel 305, the active friction wheel 308 begins to drive the passive friction wheel 306 and the main impeller 303 to rotate.
[0041] As liquid enters the inner buoyancy tank 103, the liquid level inside the inner buoyancy tank 103 rises. This rise in liquid level causes the large float 112 and the lower float 111 to rise due to buoyancy. The lower float 111 rises until it contacts the central thick column 108 and then can no longer rise. The large float 112 rises to the outside of the central thick column 108 and continues to rise along it. As the liquid level in the inner buoyancy tank 103 continues to rise, when the large float 112 contacts the upper float 113, it indicates that the liquid level in the inner buoyancy tank 103 is too high, and the amount of liquid entering the inner buoyancy tank 103 needs to be reduced. The large float 112 will push the upper float 113 upwards. The upper float 113, through the switch lever 115, causes the switch horizontal plate 114 to move outwards. When 14 moves inside the switch housing 105, it first narrows the flow channel of the switch housing 105 to reduce the amount of liquid entering the inner buoyancy box 103. If the large float 112 and the upper float 113 continue to rise, they will drive the switch horizontal plate 114 to close the switch housing 105. At this time, the liquid can no longer enter the inner buoyancy box 103. As the liquid level in the inner buoyancy box 103 drops, the large float 112 and the upper float 113 will drop. At this time, the switch horizontal plate 114 will slowly open the switch housing 105, and the liquid will continue to enter the inner buoyancy box 103. That is, when the liquid level in the inner buoyancy box 103 is higher than a certain value, the speed at which the liquid enters the inner buoyancy box 103 will be automatically reduced until it stops entering. When the liquid level in the inner buoyancy box 103 drops, the liquid entry will resume.
[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the present invention based on the technical solution and inventive concept of the present invention should be covered within the scope of protection of the present invention.
Claims
1. An electric device for braking a valve float, comprising a main mechanism for adjusting the inlet speed of the valve, characterized in that: The main body includes a valve housing (101), and the main body is provided with a braking mechanism for braking the valve and a conveying mechanism for conveying fluid.
2. The electric device for braking a valve float according to claim 1, characterized in that: The main structure also includes an inner buoyancy box (103) fixedly installed inside the valve housing (101). A lower thin column (109) is fixedly installed inside the inner buoyancy box (103). A middle thick column (108) is fixedly installed on the lower thin column (109). An upper thin column (110) is fixedly installed on the middle thick column (108). The upper thin column (110) is fixedly installed with the inner buoyancy box (103). A lower float plate (111) is slidably installed on the lower thin column (109). A large float plate (112) is slidably installed on the middle thick column (108).
3. The electric device for braking a valve float according to claim 2, characterized in that: The main structure also includes an inflow pipe (106) fixedly installed on the top of the inner buoyancy box (103). A switch housing (105) is fixedly installed on the inflow pipe (106). A switch horizontal plate (114) is slidably installed inside the switch housing (105). A switch rotating rod (115) is rotatably installed on the switch horizontal plate (114). An upper floating plate (113) is slidably installed on the upper thin column (110). The upper floating plate (113) is rotatably installed with the switch rotating rod (115).
4. The electric device for braking a valve float according to claim 3, characterized in that: The main structure also includes an inlet pipe (104) fixedly installed on the switch housing (105), the inlet pipe (104) being fixedly installed on the valve housing (101), a connecting pipe (107) being fixedly installed on the inner buoyancy box (103), a bottom support (102) being fixedly installed at the bottom of the valve housing (101), the inlet pipe (104) being connected to the switch housing (105), the switch housing (105) being connected to the inflow pipe (106), the inflow pipe (106) being connected to the inner buoyancy box (103), and the inner buoyancy box (103) being connected to the connecting pipe (107).
5. The electric device for braking a valve float according to claim 2, characterized in that: The braking mechanism includes two sliding grooves (203) disposed in the inner buoyancy box (103). A sealing plug (202) is slidably installed in the sliding groove (203). A lower rack (201) is fixedly installed on the sealing plug (202). A lower rotating rod (204) is rotatably installed on the lower rack (201). The lower rotating rod (204) is rotatably installed with the lower float (111).
6. The electric device for braking a valve float according to claim 5, characterized in that: The braking mechanism further includes a central gear (205) and an upper gear (206) rotatably mounted on the inner buoyancy box (103). The central gear (205) meshes with the upper gear (206), and the lower rack (201) meshes with the central gear (205). A brake lever (207) is slidably mounted on the inner buoyancy box (103). An upper rack (208) is fixedly mounted on the brake lever (207). The upper rack (208) meshes with the upper gear (206). A groove is provided at the end of the brake lever (207), and a friction plate is provided in the groove.
7. The electric device for braking a valve float according to claim 4, characterized in that: The conveying mechanism includes an impeller housing (301) fixedly installed inside the valve housing (101). The impeller housing (301) is fixedly installed with the connecting pipe (107), and the connecting pipe (107) is connected to the impeller housing (301). An output pipe (302) is fixedly installed on the impeller housing (301), and the output pipe (302) is connected to the impeller housing (301). The output pipe (302) is fixedly installed with the valve housing (101). A main impeller (303) is rotatably installed inside the impeller housing (301).
8. The electric device for braking a valve float according to claim 7, characterized in that: The conveying mechanism also includes an impeller shaft (304) fixedly mounted on the main impeller (303), a brake wheel (305) and a passive friction wheel (306) fixedly mounted on the impeller shaft (304), an input shaft (307) rotatably mounted on the valve housing (101), an active friction wheel (308) fixedly mounted on the input shaft (307), the input shaft (307) being connected to an external power source, and the active friction wheel (308) and the passive friction wheel (306) forming a friction drive.