Mute self-suction device with stable performance
By installing a shutdown valve on the suction pipe in the self-priming drainage system and controlling its opening and closing according to the water level, the problem of high failure rate of the diaphragm valve is solved, and the effect of reducing the failure rate and usage cost is achieved.
Patent Information
- Application Number
- CN202411416323.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In traditional self-priming drainage systems, the diaphragm valve has a high failure rate due to long-term humid environment and is relatively high in maintenance costs.
Design a silent self-priming device with stable performance, which eliminates the diaphragm valve, uses a shutdown valve to install a suction pipe, and controls the opening and closing of the shutdown valve according to the water level in the well body through a control mechanism, which eliminates the overall structure. Diaphragm valve structure.
It effectively avoids the failure of the diaphragm valve, reduces the overall failure rate and usage cost, and improves the reliability and service life of the system.
Smart Images
Figure CN119103396A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of self-priming drainage technology, and in particular to a silent self-priming device with stable performance. Background Art
[0002] Self-priming drainage technology generally refers to the process of using a self-priming pump to achieve drainage. In terms of construction technology, self-priming pumps are often used for well point dewatering, which is a common technology used on construction sites to lower the groundwater level for foundation construction. By drilling holes in the soil and inserting well point pipes, self-priming pumps can suck out groundwater from them, thereby lowering the water level.
[0003] The self-priming drainage system includes two core parts: the diaphragm valve and the opening and closing valve drive mechanism. The valve opening mechanism of the diaphragm valve used in the traditional multi-point self-priming drainage system is usually "connecting the upper cavity of the diaphragm with the self-priming pipe network". The diaphragm deforms under the action of the pressure difference to open the valve, and the sewage is discharged through the valve; when the sewage is discharged, the pressure of the diaphragm returns to balance and the valve is closed again.
[0004] In actual use, it was found that after the diaphragm valve was applied to the self-priming drainage system, the spring in the cavity was always in a humid environment because the upper cavity of the diaphragm valve was connected to the self-priming pipe network with high air humidity. In some operating sites, the cavity was even filled with water, causing the spring to rust. Over time, the failure rate of the diaphragm valve remained high. Summary of the invention
[0005] In order to reduce the maintenance cost of the self-priming drainage system, the present application provides a silent self-priming device with stable performance, which eliminates the need for a diaphragm valve and reduces the failure rate.
[0006] The present application provides a stable performance silent self-priming device adopts the following technical solution: A silent self-priming device with stable performance includes a water suction pipe, a shut-off valve installed on the water suction pipe, and a control mechanism for controlling the opening and closing of the shut-off valve. The water suction pipe is vertically fixed in a well body, and the control mechanism follows the rise and fall of the liquid level in the well body and is linked with the shut-off valve.
[0007] By adopting the above technical solution, a shut-off valve is installed on the suction pipe, and the control mechanism controls the opening and closing of the shut-off valve according to the water level in the well body, thereby controlling the drainage of the self-priming drainage system. The overall structure omits the diaphragm valve structure, thereby effectively avoiding the failure of the diaphragm valve, reducing the overall failure rate, and reducing the cost of use.
[0008] Optionally, the control mechanism includes a guide tube, a guide rod and a float arranged on the guide rod, the guide tube is vertically fixed in the well body, the guide rod is slidably inserted in the guide tube, the float drives the guide rod to follow the rise and fall of water level, and the guide rod is linked to the shut-off valve.
[0009] By adopting the above technical solution, a guide tube and a guide rod are provided, and a float is provided on the guide rod. During normal working, the float floats on the water surface and follows the rise and fall of the water level in the well body; when the water level rises, the float drives the guide rod to rise, thereby opening the shut-off valve, and the system pumps out the water in the well body; when the water level drops as the system continues to pump out water, the float drives the guide rod to move downward, thereby gradually closing the shut-off valve.
[0010] Optionally, a gear box is fixed in the well body, the shut-off valve is installed in the gear box, and the control end of the shut-off valve is set as a driving gear; a driving rack is fixed to the upper end of the guide rod along the length direction, and the driving rack is meshed with the driving gear.
[0011] By adopting the above technical solution, a gear box is arranged in the well body, and a driving gear and a driving rack are arranged in the gear box. When the guide rod rises and falls with the water level, the driving rack drives the driving gear to rotate, thereby controlling the opening and closing of the shut-off valve.
[0012] Optionally, a pulley is installed in the gear box at a position corresponding to the driving rack, and a side wall of the driving rack is in contact with the pulley.
[0013] By adopting the above technical solution, a pulley is arranged at the installation position corresponding to the driving rack in the gear box, which can effectively reduce the resistance of the driving rack during sliding and improve the flexibility of opening and closing the shut-off valve.
[0014] Optionally, the float is slidably arranged on the guide rod, an upper limit plate and a lower limit plate are fixed on the guide rod, the float slides between the upper limit plate and the lower limit plate, and a counterweight is fixed on the float.
[0015] By adopting the above technical scheme, the float is slidably set on the guide rod. When the water level gradually rises, the float rises with the water level, but the guide rod does not move, and the shut-off valve is not opened at this time; when the float rises with the water level to the upper limit plate, the float will push the upper limit plate to move the guide rod upward to open the shut-off valve; after the shut-off valve is opened, the water level discharged from the water cup in the well body gradually decreases, but since the opening and closing of the shut-off valve has a certain resistance, the shut-off valve is in the original position and remains open at this time; when the water level drops to the point where the float contacts the lower limit plate, the water level continues to drop, and the float will drive the guide rod to move downward to close the shut-off valve; the threshold for opening the shut-off valve can be effectively reduced, the frequency of opening and closing the shut-off valve can be reduced, and the overall service life can be improved.
[0016] Optionally, a locking mechanism for locking the guide rod is provided in the gear box, the locking mechanism comprising a locking plate, a lever and a lock box fixed in the gear box; the guide rod passes through the lock box and slidably cooperates with the lock box; the lever is rotatably fixed in the gear box and is located on one side of the lock box; a card slot is penetrated through the lock plate, a lock slot is provided on the side wall of the guide rod, the lock plate is slidably arranged in the lock box along a direction perpendicular to the guide rod, and the guide rod is inserted in the card slot; a first elastic member is provided in the lock box, the first elastic member is located at an end of the lock plate away from the lever, the first elastic member pushes the lock plate to one side of the lever, so that the lock plate and the lever abut against each other; when the shut-off valve is in a closed state, the lock plate is inserted in the lock slot; a floating ball is provided in the well body, the floating ball is located between the floating body and the water inlet of the well body, and the floating ball is linked to the lever.
[0017] By adopting the above technical solution, a locking mechanism is arranged in the gear box. During normal operation, the water level in the well body continues to rise, but since the locking plate jams the guide rod, the float will not drive the guide rod to move upward; when the water level continues to rise to the float position, the water level drives the float to rise, thereby driving the lever to rotate, and drives the locking plate to move toward the side of the first elastic member, so that the locking plate is disengaged from the locking groove of the guide rod. At this time, the guide rod moves upward under the buoyancy of the float to open the shut-off valve, and the system discharges the water in the well body; when the water level gradually drops, the float drives the guide rod to drop and gradually close the shut-off valve, and at the same time the float also gradually drops with the water level, and the first elastic member pushes the locking plate to close the guide rod, and when the guide rod drops until the locking groove is flush with the locking plate, the locking plate is inserted into the locking groove to lock the position of the guide rod.
[0018] Optionally, a control rod is connected between the float and the shift rod, and the control rod extends the float to the lower side of the water inlet of the well body.
[0019] By adopting the above technical solution, a control rod is arranged between the float and the lever, and the control rod can increase the force arm between the float and the lever, so that the float can drive the lever to move when it floats up.
[0020] Optionally, a second elastic member is further provided in the lock box, and the second elastic member is sleeved on the guide rod. A snap ring is fixed on the guide rod below the lock groove, and two ends of the second elastic member respectively abut against the snap ring and the bottom of the lock box.
[0021] By adopting the above technical solution, a second elastic member is arranged on the guide rod. When the water level rises, the second elastic member can increase the upward thrust of the guide rod, so that the guide rod can quickly break away from the locking plate to open the shut-off valve.
[0022] Optionally, the shut-off valve is configured as a ball valve opened and closed by a handle, a toggle ring is fixed to the upper end of the guide rod, and the toggle ring is sleeved on the handle of the shut-off valve.
[0023] By adopting the above technical solution, a toggle ring is fixed on the upper end of the guide rod, and the toggle ring is sleeved on the handle of the shut-off valve. When the guide rod moves up and down, the handle can be toggled to open or close the shut-off valve.
[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By installing a shut-off valve on the suction pipe, the control mechanism controls the opening and closing of the shut-off valve according to the water level in the well body, thereby controlling the drainage of the self-priming drainage system. The overall structure omits the diaphragm valve structure, which can effectively avoid the failure of the diaphragm valve, reduce the overall failure rate, and reduce the cost of use; 2. By setting a guide tube and a guide rod, and setting a float on the guide rod, during normal operation, the float floats on the water surface and follows the rise and fall of the water level in the well body. When the water level rises, the float drives the guide rod to rise, thereby opening the shut-off valve, and the system pumps out the water in the well body. When the water level drops as the system continues to pump out, the float drives the guide rod to move downward, thereby gradually closing the shut-off valve; 3. By sliding the float on the guide rod, when the water level gradually rises, the float rises with the water level, but the guide rod does not move, and the shut-off valve is not opened at this time. When the float rises with the water level to the upper limit plate, the float will push the upper limit plate, causing the guide rod to move up to open the shut-off valve. After the shut-off valve is opened, the water level discharged from the water cup in the well body gradually decreases, but since the opening and closing of the shut-off valve has a certain resistance, the shut-off valve remains in the original position and remains open. When the water level drops to the point where the float contacts the lower limit plate, the water level continues to drop, and the float will drive the guide rod to move down to close the shut-off valve, which can effectively reduce the threshold for opening the shut-off valve and reduce the frequency of opening and closing the shut-off valve, thereby increasing the overall service life. 4. By setting a locking mechanism in the gear box, during normal operation, the water level in the well body continues to rise, but since the locking plate jams the guide rod, the float will not drive the guide rod to move up. When the water level continues to rise to the float position, the water level drives the float to rise, thereby driving the lever to rotate, and moving the locking plate to the side of the first elastic member, so that the locking plate is disengaged from the locking groove of the guide rod. At this time, the guide rod moves upward under the buoyancy of the float to open the shut-off valve, and the system discharges the water in the well body. When the water level gradually drops, the float drives the guide rod to descend and gradually close the shut-off valve. At the same time, the float also gradually drops with the water level. The first elastic member pushes the locking plate close to the guide rod. When the guide rod drops to the point where the locking groove is flush with the locking plate, the locking plate is inserted into the locking groove to lock the position of the guide rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 It is a schematic diagram of the overall structure of Example 2 of the present application; Figure 3 is a working schematic diagram a of Example 2 of the present application; Figure 4 is a working schematic diagram b of Example 2 of the present application; Figure 5 is a working schematic diagram c of Example 2 of the present application; Figure 6 is a working schematic diagram d of Example 2 of the present application; Figure 7 It is a schematic diagram of the overall structure of Example 3 of the present application; Figure 8 yes Figure 7 Magnified view of area A in the middle; Fig. 9 is a schematic diagram of the structure of Example 4 of the present application; Fig.10 It is a structural diagram of Example 5 of the present application.
[0026] : 01, well body; 011, water inlet; 02, wellbore; 03, well cover; 1, suction pipe; 11, control valve; 12, pressure gauge; 13, drain outlet; 2, shut-off valve; 21, driving gear; 3, control mechanism; 31, guide tube; 32, guide rod; 321, upper limit plate; 322, lower limit plate; 323, locking groove; 324, retaining ring; 325, toggle ring; 33, float; 331, counterweight; 34, gear box; 35, driving rack; 36, pulley; 4, locking mechanism; 41, locking plate; 411, retaining groove; 42, toggle rod; 43, lock box; 44, first elastic member; 45, button; 46, float; 47, control rod; 48, second elastic member. DETAILED DESCRIPTION
[0027] Embodiment 1: Example 1 of the present application discloses a silent self-priming device with stable performance, referring to Figure 1, including a water suction pipe 1, a shut-off valve 2 and a control mechanism 3 for controlling the opening and closing of the shut-off valve 2; a well body 01 is installed at the construction position, a well shaft 02 is fixed at the upper end of the well body 01, a well cover 03 is provided on the upper end cover of the well shaft 02, and a water inlet 011 is provided on the side wall at the upper end of the well body 01; the water suction pipe 1 is vertically fixed in the well body 01, the shut-off valve 2 is installed in series on the water suction pipe 1, and the control mechanism 3 can control the opening and closing of the shut-off valve 2 following the rise and fall of the water level in the well body 01; when the water level rises, the control mechanism 3 opens the shut-off valve 2, and the system discharges the water in the well body 01, and when the water level drops, the control mechanism 3 closes the shut-off valve 2, and the system stops draining water.
[0028] The control mechanism 3 includes a guide tube 31, a guide rod 32 and a float 33 for fixing the end of the guide rod 32. The guide tube 31 is vertically fixed in the well body 01 on one side of the water suction pipe 1; the guide rod 32 is slidably inserted into the guide tube 31, the upper end of the guide rod 32 is linked to the shut-off valve 2, and the float 33 is located at the lower end of the guide rod 32.
[0029] The control mechanism 3 also includes a gear box 34, which is fixed in the well body 01, the suction pipe 1 runs through the gear box 34 and the shut-off valve 2 is located in the gear box 34. The shut-off valve 2 is set as a ball valve, and the control end of the shut-off valve 2 is set as a driving gear 21; the edge of the ball center of the shut-off valve 2 is set as a sharp knife edge, which can cut off the blockage in the valve during the closing process to prevent the valve from closing tightly. The guide pipe 31 is fixed to the lower side of the gear box 34 and is connected to the inside of the gear box 34. A driving rack 35 is fixed along the length direction at the upper end of the guide rod 32, and the driving rack 35 is meshed with the driving gear 21. When the water level in the well body 01 rises, the water level drives the float 33 to float upward, causing the guide rod 32 to move upward and drive the shut-off valve 2 to open, and the system discharges the water in the well body 01.
[0030] A counterweight 331 is fixed on the float 33. When the water level in the well body 01 drops, the float 33 drives the guide rod 32 to close the shut-off valve 2 as the water level drops, and the system stops draining water. A plurality of pulleys 36 are installed in the gear box 34 at positions corresponding to the drive rack 35. The side wall of the drive rack 35 fits the pulley 36, which can effectively reduce the resistance of the drive rack 35 to slide.
[0031] A control valve 11 is installed in series on the suction pipe 1 at one end of the shutoff valve 2 near the drain port 13. The control valve 11 can manually control the opening and closing of the suction pipe 1, thereby controlling the opening and closing of the system. A pressure gauge 12 is installed on the suction pipe 1 between the control valve 11 and the shutoff valve 2. The staff can monitor the pressure changes in the suction pipe 1 in real time according to the pressure gauge 12 to prevent blockage in the suction pipe 1.
[0032] The implementation principle of a silent self-priming device with stable performance disclosed in Example 1 of the present application is: by setting a shut-off valve 2 on the water suction pipe 1, the control mechanism 3 controls the opening and closing of the shut-off valve 2 according to the water level changes in the well body 01, thereby controlling the operation of the self-priming drainage system. The overall structure is simple and can effectively reduce the failure rate of the system.
[0033] Embodiment 2: The difference between Example 2 of the present application and Example 1 is that, referring to Figure 2 The float 33 is slidably arranged on the guide rod 32. The float 33 and the counterweight 331 are coaxially sleeved on the outside of the guide rod 32 and slidably cooperate with the guide rod 32; an upper limit plate 321 is fixed in the middle of the guide rod 32, and a lower limit plate 322 is fixed at the lower end of the guide rod 32, and the float 33 slides between the upper limit plate 321 and the lower limit plate 322.
[0034] Reference Figure 3 In the free state, the float 33 is placed on the lower limit plate 322 under the action of the counterweight block 331. Here, the guide rod 32 is at the lower dead point position driven by the float 33 and the counterweight block 331, and the shut-off valve 2 is closed.
[0035] Reference Figure 4 When the water level in the well body 01 gradually rises, the float 33 gradually rises to the upper limit plate 321 driven by the water level. During this stroke of the float 33, the guide rod 32 does not move.
[0036] Reference Figure 5 As the water level in the well body 01 continues to rise, the water level drives the float 33 to continue to float up. At this time, the float 33 drives the guide rod 32 to move up against the upper limit plate 321. At the same time, the guide rod 32 gradually opens the shut-off valve 2, and the system discharges the water in the well body 01 to the outside; when the float 33 drives the guide rod 32 to move up to the upper limit plate 321 and abuts the guide pipe 31, the shut-off valve 2 is fully opened.
[0037] Reference Figure 6 After the shut-off valve 2 is fully opened, the water level in the well body 01 begins to drop. However, due to a certain resistance in the opening and closing of the shut-off valve 2, the position of the guide rod 32 remains unchanged and the shut-off valve 2 is still in an open state. At this time, the float 33 slides downward on the guide rod 32 until the float 33 contacts the lower limit plate 322. Under the gravity of the counterweight block 331, the float 33 pulls the guide rod 32 downward, gradually closing the shut-off valve 2.
[0038] The implementation principle of Example 2 of the present application is as follows: by sliding the float 33 and the counterweight block 331 on the guide rod 32, the shut-off valve 2 will be opened to drain water only when the float 33 floats up with the water level to push the upper limit plate 321 upward; when the water level drops to the lowest level, the float 33 and the counterweight block 331 will pull the guide rod 32 to close the shut-off valve 2; the threshold for opening the shut-off valve 2 can be effectively increased, so that the shut-off valve 2 will not be frequently opened or closed when the water level changes slightly, which can effectively extend the overall service life and reduce the failure rate.
[0039] Embodiment 3: The difference between Example 3 of the present application and Example 1 is that, referring to Figure 7 and Figure 8 A locking mechanism 4 for locking the guide rod 32 is provided in the gear box 34. The locking mechanism 4 includes a locking plate 41, a lever 42, and a lock box 43 fixed in the gear box 34. The guide rod 32 passes through the lock box 43 and slidably cooperates with the lock box 43. A locking groove 411 is provided on the locking plate 41, and a locking groove 323 is provided on the side wall of the guide rod 32. The locking plate 41 is slidably installed in the lock box 43 along a direction perpendicular to the guide rod 32, and the guide rod 32 is inserted in the locking groove 411 of the locking plate 41. The lever 42 is rotatably fixed in the gear box 34 and is located on one side of the lock box 43; a first elastic member 44 is installed in the lock box 43, and the first elastic member 44 is configured as a compression spring. The first elastic member 44 is located at the end of the locking plate 41 away from the lever 42, and the first elastic member 44 pushes the locking plate 41 toward the side of the lever 42; a button 45 is slidably installed on the side wall of the box body, and the button 45 is located at the end of the locking plate 41 away from the first elastic member 44. The locking plate 41 abuts on the button 45, so that the button 45 protrudes out of the box body and abuts against the lever 42.
[0040] The locking mechanism 4 also includes a float 46 and a control rod 47, one end of the control rod 47 is fixed to the end of the lever 42 away from the lock box 43; the float 46 is a buoyant sphere, the float 46 is fixed to the end of the control rod 47 away from the lever 42, and the lower side of the float 46 is lower than the lower side of the water inlet 011 of the well body 01.
[0041] In the free state, the locking plate 41 is inserted into the locking groove 323 of the guide rod 32, and the shut-off valve 2 is in the closed state. When the water level in the well body 01 rises to the highest point, that is, when it is close to the water inlet 011, the water level drives the float 46 to float up, and the float 46 pushes the control rod 47 upward, so that the lever 42 rotates to push the locking plate 41. At this time, the guide rod 32 moves upward under the buoyancy of the float 33, thereby opening the shut-off valve 2 and the system drains water outward. When the water level drops, the float 33 drives the guide rod 32 to move downward. When the guide rod 32 drops to the point where the locking plate 41 is flush with the locking groove 323, the locking plate 41 is inserted into the locking groove 323 under the action of the first elastic member 44, locking the guide rod 32.
[0042] A second elastic member 48 is sleeved on the guide rod 32, and the second elastic member 48 is a compression spring; a retaining ring 324 is fixed on the guide rod 32 below the locking groove 323, and the two ends of the second elastic member 48 are respectively abutted against the retaining ring 324 and the bottom of the lock box 43. When the locking plate 41 is out of the locking groove 323, the second elastic member 48 provides an upward thrust to the guide rod 32, so that the guide rod 32 quickly passes through the locking plate 41 to open the shut-off valve 2, which can improve the response rate of the system.
[0043] The implementation principle of Example 3 of the present application is: by setting a locking mechanism, the threshold for opening the shut-off valve 2 is increased through the locking mechanism. The shut-off valve 2 can only be opened when the water level in the well body 01 reaches the highest level. Similarly, the shut-off valve 2 will only be closed when the water level drops to a lower position. This can effectively reduce the number of times the shut-off valve 2 is opened and closed, and improve its overall service life.
[0044] Embodiment 4: The difference between Example 4 of the present application and Example 2 is that, referring to Fig. 9 The shut-off valve 2 is configured as a ball valve opened and closed by a handle. A toggle ring 325 is fixed to the upper end of the guide rod 32 . The toggle ring 325 is a metal ring, and the handle of the shut-off valve 2 is inserted into the toggle ring 325 .
[0045] When the water level in the well body 01 rises, the float 33 gradually floats upward and abuts against the upper limit plate 321; as the water level further rises, the float 33 further floats upward under the action of buoyancy, and drives the guide rod 32 to move upward through the upper limit plate 321, and the toggle ring 325 drives the handle of the shut-off valve 2 to rotate, and the flow channel of the shut-off valve 2 gradually opens, and the system discharges the water in the well body 01. Moreover, the higher the water level in the well body 01, the greater the upward movement of the guide rod 32 and the toggle ring 325, and the greater the degree of opening of the flow channel of the shut-off valve 2, thereby achieving higher drainage efficiency at high water levels.
[0046] Embodiment 5: The difference between Example 5 of the present application and Example 3 is that, referring to Fig.10 The shut-off valve 2 is configured as a ball valve opened and closed by a handle, and a toggle ring 325 is fixed to the upper end of the guide rod 32. The toggle ring 325 is a metal ring, and the handle of the shut-off valve 2 is inserted into the toggle ring 325. When the guide rod 32 moves up and down, the toggle ring 325 drives the handle to open and close the shut-off valve 2.
[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A silent self-priming device with stable performance, characterized by: The invention comprises a water suction pipe (1), a shut-off valve (2) installed on the water suction pipe (1), and a control mechanism (3) for controlling the opening and closing of the shut-off valve (2); the water suction pipe (1) is vertically fixed in a well body; the control mechanism (3) follows the rise and fall of the liquid level in the well body and is linked to the shut-off valve (2).
2. A silent self-priming device with stable performance according to claim 1, characterized in that: The control mechanism (3) comprises a guide tube (31), a guide rod (32) and a float (33) arranged on the guide rod (32); the guide tube (31) is vertically fixed in the well body; the guide rod (32) is slidably inserted in the guide tube (31); the float (33) drives the guide rod (32) to follow the rise and fall of the water level; the guide rod (32) is linked to the shut-off valve (2).
3. A silent self-priming device with stable performance according to claim 2, characterized in that: A gear box (34) is fixed in the well body, the shut-off valve (2) is installed in the gear box (34), and the control end of the shut-off valve (2) is arranged as a driving gear (21); a driving rack (35) is fixed at the upper end of the guide rod (32) along the length direction, and the driving rack (35) is meshed with the driving gear (21).
4. A silent self-priming device with stable performance according to claim 3, characterized in that: A pulley (36) is installed in the gear box (34) at a position corresponding to the driving rack (35), and a side wall of the driving rack (35) is in contact with the pulley (36).
5. A silent self-priming device with stable performance according to claim 2, characterized in that: The floating body (33) is slidably arranged on the guide rod (32), an upper limit plate (321) and a lower limit plate (322) are fixed on the guide rod (32), the floating body (33) slides between the upper limit plate (321) and the lower limit plate (322), and a counterweight block (331) is fixed on the floating body (33).
6. A silent self-priming device with stable performance according to claim 3, characterized in that: The gear box (34) is provided with a locking mechanism (4) for locking the guide rod (32), and the locking mechanism (4) comprises a locking plate (41), a lever (42) and a lock box (43) fixed in the gear box (34); the guide rod (32) passes through the lock box (43) and is slidably matched with the lock box (43); the lever (42) is rotatably fixed in the gear box (34) and is located on one side of the lock box (43); a slot (411) is provided through the locking plate (41), a locking slot (323) is provided on the side wall of the guide rod (32), and the locking plate (41) is slidably arranged in the lock box (43) along a direction perpendicular to the guide rod (32). The guide rod (32) is inserted into the card slot (411); a first elastic member (44) is arranged in the lock box (43), and the first elastic member (44) is located at the end of the lock plate (41) away from the lever (42), and the first elastic member (44) pushes the lock plate (41) toward the side of the lever (42), so that the lock plate (41) and the lever (42) are in contact; when the shut-off valve (2) is in a closed state, the lock plate (41) is inserted into the lock slot (323); a float (46) is arranged in the well body, and the float (46) is located between the float (33) and the water inlet of the well body, and the float (46) is linked with the lever (42).
7. A silent self-priming device with stable performance according to claim 6, characterized in that: A control rod (47) is connected between the float (46) and the shifting rod (42), and the control rod (47) extends the float (46) to the lower side of the water inlet of the well body.
8. A silent self-priming device with stable performance according to claim 6, characterized in that: A second elastic member (48) is also provided in the lock box (43). The second elastic member (48) is sleeved on the guide rod (32). A snap ring (324) is fixed on the guide rod (32) below the lock groove (323). Two ends of the second elastic member (48) respectively abut against the snap ring (324) and the bottom of the lock box (43).
9. A silent self-priming device with stable performance according to claim 2, characterized in that: The shutoff valve (2) is configured as a ball valve opened and closed by a handle, and a toggle ring (325) is fixed to the upper end of the guide rod (32), and the toggle ring (325) is sleeved on the handle of the shutoff valve (2).