A sewage pump pressure relief protection device

Abstract

The present invention relates to the technical field of sewage pumps, and particularly relates to a pressure relief protection device for a sewage pump, which comprises a water pump, a clutch element, a pressure relief mechanism, a moving mechanism, an adjusting mechanism and a control mechanism; a clutch element is movably installed on the rotating shaft of the water pump, and the clutch element is located between the motor and the impeller of the water pump; a pressure relief mechanism is fixedly installed on one side of the bottom of the water pump; a moving mechanism is fixedly installed at the bottom of the water pump; an adjusting mechanism is fixedly installed below the moving mechanism; the water pump is controlled by the control mechanism and is electrically connected to the control mechanism; the present invention solves the problems in the existing pressure relief protection device for sewage pumps that when the pipeline is blocked, the sewage pump cannot stop working immediately. At the same time, when the pressure is relieved, the water flow flows back into the sewage pump again, which will cause the internal water pressure of the pump body to be too high and push the impeller to rotate, resulting in the stall of the motor on the sewage pump and causing the motor to burn out. The invention realizes that when the pipeline is blocked, the sewage pump stops working immediately and prevents the motor from stalling and causing the motor to burn out.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage pumps, and particularly relates to a pressure relief protection device for a sewage pump. Background Art

[0002] The water pump belongs to a kind of centrifugal impurity pump and has various forms: such as submersible and dry types. It is usually used to extract liquids. Through the mechanical energy of the rotation of the water pump, it is converted into the kinetic energy of the liquid flow, so as to realize the flow of the liquid in the pipeline.

[0003] Sewage pumps are applied in various fields. For example, in the transportation and cleaning of urban sewage, in the cleaning of urban sewage, it is necessary to separate various impurity solid particles and sewage liquids in the sewage. Therefore, the sewage pump plays an important role in it. It can separate the sewage liquid and solid, extract the sewage, and transport it to a designated place for the next cleaning process.

[0004] When the existing sewage pump extracts and transports sewage, various impurity solids such as feces and paper scraps in the water pump are usually extracted into the pipeline together with the sewage by the sewage pump. During long-term operation, it is easy to cause the flow channel of the sewage pump to be blocked. Since the sewage pump cannot stop working immediately when it is blocked, it will continuously extract water flow into the pipeline, causing the water pressure in the pipeline to continue to rise, resulting in pipeline rupture. And in the existing pressure relief system, the water flow after diversion is often re-circulated into the sewage pump body, which will cause the water pressure inside the pump body to be too high and push the impeller to rotate, resulting in the stall of the motor on the sewage pump, thus causing the motor to burn out.

[0005] Based on the above problems, some solutions are given in the prior art. For example, a Chinese invention patent (Application No.: CN202022991127.8, Publication Date: August 17, 2021) discloses a water pump with an automatic pressure relief device, including a water pump body and a water pump base. The water pump body is fixedly welded on the water pump base. One end of the water inlet of the water pump body is connected with a connecting plate by screws, and an extension pipe is fixedly communicated on the connecting plate. The top of the extension pipe is fixedly inserted with a top vertical pipe. When the pressure inside the extension pipe is too high, the pressure will push the sleeve plate to move upward. Under the action of the guide rod, the sleeve plate moves vertically upward, so that the water delivery pipe, the top vertical pipe and the extension pipe are interconnected, thus achieving the function of pressure relief. However, the above invention does not reasonably solve the problems that the water pump stops immediately when the pipeline is blocked and the motor on the sewage pump stalls, resulting in the motor burning out.

[0006] In view of this, in view of the above deficiencies, the present invention designs a pressure relief protection device for a sewage pump. Summary of the Invention

[0007] Technical problems to be solved by the present invention: In the existing pressure relief protection device of sewage pumps, when the pipeline is blocked, the device cannot stop working immediately. At the same time, when the pressure is relieved, the water flow flows back into the sewage pump again, which will cause the internal water pressure of the pump body to be too high and push the impeller to rotate, resulting in the stall of the motor on the sewage pump and causing the motor to burn out.

[0008] The present invention provides the following technical solutions: A pressure relief protection device for a sewage pump, comprising a pump body, a clutch element, a pressure relief mechanism, a moving mechanism, an adjusting mechanism and a control mechanism; A clutch element is movably installed on the rotating shaft of the pump body, and the clutch element is located between the motor and the impeller of the pump body; One side of the bottom of the pump body is fixedly installed with a pressure relief mechanism, and the pressure relief mechanism is used to drive and trigger the movement of the moving mechanism by the pressure of the water flow, so as to ensure that while the pipeline is being pressure-relieved, the load on the pump body is reduced. The specific installation method can be connected by bolt connection or welding; The bottom of the pump body is fixedly installed with a moving mechanism, and the moving mechanism is used to transfer the pressure of the pressure relief mechanism to the moving mechanism, so that the moving mechanism moves and cuts off the power of the pump body. The specific installation method can be connected by bolt connection or welding; The adjusting mechanism is fixedly installed below the moving mechanism, and the adjusting mechanism is used to change the rated pressure on the pressure relief mechanism by adjusting the moving mechanism, so as to change the pressure relief trigger value inside the pipeline. The specific installation method can be connected by bolt connection or welding; The pump body is controlled by the control mechanism and is electrically connected to the control mechanism; The control mechanism controls the start and operation of the pump body; The diameter of the pump body is between 30 and 60 cm.

[0009] The pressure relief mechanism includes a U-shaped pipe, a piston, and an elastic element; a rectangular through-hole is provided on one side of the U-shaped pipe, and a circular hole is provided on one side of the U-shaped pipe, and the circular hole is located above the rectangular through-hole. The piston is movably installed on one side of the rectangular through-hole on the U-shaped pipe, and the piston is located above the rectangular through-hole; one end of the elastic element is fixedly installed at the bottom of the piston, and the other end of the elastic element is fixedly installed at one end port of the U-shaped pipe. The specific installation method can be connected by bolts or welding. The U-shaped pipe is made of stainless steel. Stainless steel has good corrosion resistance and mechanical properties and is commonly used in high-pressure pressure relief pipes. 304 and 316 stainless steels can be optionally used, and 316 stainless steel is preferred. 316 stainless steel has better corrosion resistance and high-temperature resistance than 304 stainless steel; the diameter of the U-shaped pipe is between 5-8 cm; the diameter of the piston is between 5-8 cm. The elastic element can be an airbag or a spring, and a spring is preferred. The elastic element can be made of spring steel, alloy steel or titanium alloy, and spring steel is preferred; because the elastic element will be soaked in water for a long time, using spring steel can avoid the corrosion of sewage, can be used for a long time, and does not need to be replaced frequently, increasing the service life of the elastic element; the diameter of the spring is between 0.2-0.7 mm; the minimum compression length of the spring is one-third of the original length of the spring.

[0010] The moving mechanism includes a movable rod and a supporting element; the horizontal end of the movable rod is located in the rectangular through-hole on the U-shaped pipe, the other end of the movable rod is located below the rotating shaft inside the pump body, and a circular ring is provided at the other end of the movable rod, and the circular ring is located on the rotating shaft of the pump body. An arc-shaped groove is provided at the bottom of the movable rod, and the bottom of the movable rod is movably installed on the supporting element; the length of the movable rod is two-thirds of the total diameter of the pump body. The movable rod is divided into multiple segments, and the distance of each segment is equal. The supporting element can move between each segment of the movable rod.

[0011] According to the lever principle formula, it can be obtained that when the supporting element on the movable rod is in different positions, different magnitudes of pressure need to be applied to the movable rod to make the movable rod move. Therefore, the rated value of the triggering pressure can be designed according to the magnitude of the applied pressure. When the supporting element moves to the left from the center of the movable rod, the rated value of the triggering pressure is increased at this time. When the supporting element moves to the right from the center of the movable rod, the rated value of the triggering pressure is decreased at this time.

[0012] The adjusting mechanism includes a sliding element, a rotating element, and a movable element; a rectangular groove is provided on the sliding element, a movable element is slidably installed on the sliding element, a rotating element is fixedly installed on one side of the sliding element, the length of the sliding element is between 15-30 cm, and the length of the rotating element is between 18-20 cm; the movable element can be a slider.

[0013] The height of the piston is greater than the height of the rectangular through-hole on the U-shaped tube. A pressing element is provided on one side of the piston, and the pressing element is located inside the rectangular through-hole. The height of the rectangular through-hole is the limit distance between the upward and downward movement of the movable rod. The pressing element is made of carbon steel, and carbon steel has high strength and good corrosion resistance.

[0014] The movable rod is of a cylindrical structure and is made of ultra-high strength steel. The diameter of the movable rod is between 2 - 4 cm. The movable rod needs to work in a high-pressure environment, so it requires high mechanical properties in this environment. The length of the movable rod is between 12 - 28 cm.

[0015] Elastic sealing material is fixedly installed around the rectangular through-hole at one end of the movable rod. The elastic sealing material is made of rubber. Rubber is a material with excellent elasticity and plasticity, and has good chemical resistance and wear resistance. Common rubber materials include nitrile rubber, chloroprene rubber, propylene rubber, silicone rubber, etc., and silicone rubber is preferred.

[0016] A semi-circular groove is provided at the top of the support element. There are rolling beads on the support element, and the rolling beads are located in the semi-circular groove. The rolling beads are made of carbon steel, and the dynamic friction coefficient of the rolling beads is between 0.0015 - 0.0023. Carbon steel has high strength and good corrosion resistance. The diameter of the rolling beads is between 0.5 - 0.8 cm.

[0017] The rotating element is of a cylindrical structure and has threads. The length of the rotating element is two-thirds of the length of the movable rod. The length of the rotating element is between 8 - 18 cm. The rotating element can be a screw.

[0018] A diversion pipe is fixedly installed on the circular hole of the U-shaped tube. The diversion pipe is communicated with the bottom of the pump body. The specific installation method can be bolt connection or welding. The diversion pipe is made of carbon steel, and the diameter of the diversion pipe is the same as the diameter of the circular hole.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. By coordinating and cooperating the pressure relief mechanism and the moving mechanism provided on the pump body, when the water pressure inside the pipeline increases, rapid pressure relief can be achieved, and through the pressure of the water flow, the motor shaft and the impeller inside the water pump are quickly separated, realizing that the power can be cut off while relieving pressure, avoiding the motor stall caused by the water flow after pressure relief, and preventing damage to the motor. Through the mutual cooperation of the moving mechanism and the adjusting mechanism provided on the water pump, the rated pressure relief value can be adjusted, enabling the water pump to be applied in different pressure environments. At the same time, elastic materials prevent the water flow after pressure relief from entering the motor inside, resulting in motor damage.

[0021] 2. Through the mutual assistance of the pressure relief mechanism, the moving mechanism, and the clutch element provided on the pump body, the thrust of the water flow is converted into the pressure of a lever. While relieving pressure, the shaft and the impeller on the motor inside the pump body are separated from each other, cutting off the power source. Without providing electricity, the power can be cut off, preventing the water pump from continuing to rotate and increasing the water pressure, resulting in pipeline rupture. At the same time, it also avoids the motor stall caused by the water pressure, resulting in motor burnout, and improves the service life of the water pump motor.

[0022] 3. Through the mutual cooperation of the moving mechanism and the adjusting mechanism provided on the pump body, the thrust of the water pressure is converted into the pressure of a lever. By adjusting the force arm through the lever, the rated pressure relief value can be changed, and the water pump can work in environments with different pressures according to different water pressures and the working power of the pump body.

[0023] 4. By providing elastic sealing materials on the pressure relief mechanism and the moving mechanism, it can prevent the water flow from entering the motor inside the pump body during the pressure relief process of the pump body, avoiding motor damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 2 is a front view of the present invention;

[0027] Figure 3 is a top view of the present invention;

[0028] Figure 4 is a three-dimensional structural schematic diagram of the pump body and the pressure relief mechanism inside the present invention;

[0029] Figure 5 Schematic diagram of the three-dimensional structure inside the pump body of the present invention;

[0030] Figure 6 Schematic diagram of the three-dimensional structure of the moving mechanism and the adjusting mechanism of the present invention;

[0031] Figure 7 Schematic diagram of the three-dimensional structure of the movable rod of the present invention;

[0032] Figure 8 Schematic diagram of the three-dimensional structure of the rotating element, the movable element and the supporting element of the present invention;

[0033] Figure 9 Schematic diagram of the three-dimensional structure of the U-shaped tube of the present invention;

[0034] Figure 10 Schematic diagram of the three-dimensional structure of the piston, the pressure-applying element and the elastic element of the present invention.

[0035] In the figure: 1, pump body; 2, clutch element; 3, pressure relief mechanism; 31, U-shaped tube; 311, rectangular through hole; 312, round hole; 32, piston; 321, pressure-applying element; 33, elastic element; 4, moving mechanism; 41, movable rod; 411, ring; 412, arc-shaped groove; 42, supporting element; 421, semi-circular groove; 43, rolling bead; 5, adjusting mechanism; 51, sliding element; 511, rectangular groove; 52, rotating element; 521, thread; 53, movable element; 6, elastic sealing material; 7, diversion pipe. Specific embodiments

[0036] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0037] Embodiment 1: When a relatively small pressure relief rating needs to be adjusted, the operator adjusts the pressure relief mechanism 3 through a tool. When the pipeline is blocked inside, the water pressure inside the pipeline will rise rapidly. When the rated pressure value is reached, the pressure relief mechanism 3 is triggered by the water pressure to start. The excess pressure inside the pipeline is quickly relieved by the pressure relief mechanism 3. The moving mechanism 4 is triggered by the pressure relief mechanism 3, so that the moving mechanism 4 drives the clutch element 2 to move, separates the rotating shaft of the motor on the pump body 1 from the impeller, cuts off the power output, ensures that the impeller no longer rotates to increase the pressure, reduces the pressure inside the pipeline, and at the same time prevents the water pressure from being too large to push the impeller to rotate and cause the motor to stall, thereby causing damage; through the adjusting mechanism 5, the rated water pressure value can be adjusted, so that the triggering value of the pressure relief mechanism 3 is increased or decreased, ensuring that the pump body 1 can work at different pressure values.

[0038] Such asFigures 1 to 5 As shown in the figure, a pressure relief protection device for a sewage pump includes a pump body 1, a clutch element 2, a pressure relief mechanism 3, a moving mechanism 4, an adjusting mechanism 5 and a control mechanism; the clutch element 2 is movably installed on the rotating shaft of the pump body 1, and the clutch element 2 is located between the motor and the impeller of the pump body 1; the clutch element 2 is used to cut off the power of the pump body 1 to prevent the motor on the pump body 1 from stalling; on one side of the bottom of the pump body 1, a pressure relief mechanism 3 is fixedly installed, and the pressure relief mechanism 3 is used to drive and trigger the movement of the moving mechanism 4 by the pressure of the water flow, so as to ensure that while the pipeline is being depressurized, the load of the pump body 1 is reduced. The specific installation method is bolt connection.

[0039] The moving mechanism 4 is fixedly installed at the bottom of the pump body 1. The moving mechanism 4 is used to transfer the pressure of the pressure relief mechanism 3 to the moving mechanism 4, so that the moving mechanism 4 moves and cuts off the power of the pump body 1. The specific installation method is bolt connection; the adjusting mechanism 5 is fixedly installed below the moving mechanism 4. The adjusting mechanism 5 is used to change the rated pressure on the pressure relief mechanism 3 by adjusting the moving mechanism 4, so as to change the pressure relief trigger value inside the pipeline. The specific installation method is bolt connection; the pump body 1 is controlled by the control mechanism and is electrically connected to the control mechanism. The control mechanism controls the start and operation of the pump body 1. When the diameter of the pump body 1 is 30 cm, the water pumping capacity of the pump body 1 is much smaller and is commonly used in places where the sewage discharge of residents is small. When the diameter of the pump body 1 is 60 cm, the water pumping capacity of the pump body 1 is larger. Because of the large water pressure inside it, it can be used in places where residential buildings are relatively high, with a large sewage discharge and better pumping efficiency.

[0040] When the pipeline is blocked, the water pressure inside the pipeline will continue to rise due to the water hammer effect and the operation of the pump body 1, causing the water pressure inside the pipeline to rise rapidly. When the water pressure rises to a certain value, the pressure relief mechanism 3 will be triggered by the pressure of the water flow, and the excess pressure inside the pipeline will be quickly relieved by the pressure relief mechanism 3. When the pressure relief mechanism 3 moves, the pressure relief mechanism 3 will trigger the start of the moving mechanism 4, and the moving mechanism 4 will drive the clutch element 2 to move, separating the rotating shaft of the motor on the pump body 1 from the impeller, cutting off the power output, so that the impeller no longer rotates. While reducing the pressure inside the pipeline, it also prevents the water pressure from being too large to push the impeller to rotate and cause the motor to stall, thus avoiding damage; through the adjusting mechanism 5, the rated water pressure value can be adjusted, so that the trigger value of the pressure relief mechanism 3 increases or decreases, ensuring that the pump body 1 can work at different pressure values.

[0041] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 9 and Figure 10As shown in the figure, the pressure relief mechanism 3 includes a U-shaped pipe 31, a piston 32, and an elastic element 33. A rectangular through-hole 311 is provided on one side of the U-shaped pipe 31, and a round hole 312 is provided on one side of the U-shaped pipe 31, and the round hole 312 is located above the rectangular through-hole 311. The piston 32 is movably installed on one side of the rectangular through-hole 311 on the U-shaped pipe 31, and the piston 32 is located above the rectangular through-hole 311. One end of the elastic element 33 is fixedly installed at the bottom of the piston 32, and the other end of the elastic element 33 is fixedly installed at one end port of the U-shaped pipe 31. The specific installation method is connected by welding. The U-shaped pipe 31 is used to divide the water flow and relieve the water pressure at the same time. The elastic element 33 is used to adjust the rated value of the pressure and reset the piston 32 at the same time. The elastic element 33 is made of spring steel. Because the elastic element 33 will be soaked in water for a long time, using spring steel can avoid the corrosion of sewage, can be used for a long time, does not need to be replaced frequently, and increases the service life of the elastic element 33.

[0042] When the diameter of the pump body 1 is 30 cm, the diameter of the selected U-shaped pipe 31 is 5 cm, and the diameter of the spring is 0.2. Since the diameter of the pump body 1 is small, the internal pressure of the pipeline is small, and the pressure borne by the pipeline is small. If the pressure is too large, the pipeline will burst. Therefore, by using the corresponding size U-shaped pipe 31 and spring, when the internal pressure of the pipeline increases, the pressure relief mechanism 3 can be triggered to ensure that the internal pressure of the pipeline does not exceed the specified value. Similarly, when the diameter of the pump body 1 is 60 cm, the diameter of the selected U-shaped pipe 31 is 8 cm, and the diameter of the spring is 0.7 mm, which can make the working efficiency of the pump body 1 better, ensure the best working efficiency of the water pump, and at the same time ensure that the internal pressure of the pipeline can be self-adjusted within the specified range, preventing the pipeline from bursting and the water pump from being damaged.

[0043] When the water pressure inside the pipeline reaches the rated trigger value, the piston 32 will be pushed by the water flow under the large water pressure. The piston 32 moves downward at one end of the U-shaped pipe 31 and compresses the elastic element 33 to move downward. When the top of the piston 32 is lower than the round hole 312 on the U-shaped pipe 31, the water flow will flow out through the round hole 312, so as to achieve the effect of pressure relief and reduce the water pressure inside the pipeline.

[0044] When the water pressure inside the pipeline is less than the rated trigger value, the elastic element 33 will apply an upward force to the piston 32 through the elastic potential energy, so that the piston 32 returns to its original position, so that the water flow will not flow out of the round hole 312 of the U-shaped pipe 31, achieving a sealing effect.

[0045] As Figures 4 to 8As shown, the moving mechanism 4 includes a movable rod 41 and a support element 42; one horizontal end of the movable rod 41 is located in the rectangular through hole 311 on the U-shaped pipe 31, the other end of the movable rod 41 is located below the rotating shaft inside the pump body 1, and a circular ring 411 is provided at the other end of the movable rod 41, and the circular ring 411 is located on the rotating shaft of the pump body 1. An arc-shaped groove 412 is formed at the bottom of the movable rod 41, and the bottom of the movable rod 41 is movably installed on the support element 42; the movable rod 41 serves as a lever and can also change the rated trigger value of the pressure, and the support element 42 is used to support the movable rod 41.

[0046] When the water pressure inside the pipeline is greater than the rated trigger value, the piston 32 on the pressure relief mechanism 3 will move downward due to the water pressure. During the movement of the piston 32, the piston 32 will apply a force to one end of the movable rod 41, and one end of the movable rod 41 will move downward under the pressure. Since the support element 42 supports the movable rod 41, the other end of the movable rod 41 will move upward, thereby driving the circular ring 411 at the other end of the movable rod 41 to move upward. While the circular ring 411 moves upward, it will apply a pressure to the clutch element 2 on the rotating shaft of the pump body 1, causing the rotating shaft on the pump body 1 to separate from the impeller at the bottom of the pump body 1, quickly cutting off the power on the pump body 1, preventing the internal pressure of the pipeline from continuing to increase, and also preventing the motor on the pump body 1 from stalling and being damaged.

[0047] As Figure 4 、 Figure 5 、 Figure 6 and Figure 8 shown, the adjusting mechanism 5 includes a sliding element 51, a rotating element 52 and a movable element 53; a rectangular groove 511 is formed on the sliding element 51, a movable element 53 is slidably installed on the sliding element 51, and a rotating element 52 is fixedly installed on one side of the sliding element 51; the sliding element 51 is used to support the movable element 53 and the rotating element 52, the rotating element 52 is used to adjust the position of the movable element 53, the length of the rectangular groove 511 on the sliding element 51 is less than the length of the movable rod 41, and the length of the rectangular groove 511 is between 10 - 25 cm.

[0048] When the diameter of the pump body 1 is 30 cm, the length of the sliding element 51 is 15 cm, the length of the rotating element 52 is 18 cm, and the length of the movable rod 41 is 12 cm. When the diameter of the pump body 1 is 60 cm, the length of the sliding element 51 is 30 cm, the length of the rotating element 52 is 20 cm, and the length of the movable rod 41 is 28 cm. According to the different diameters of the pump body 1, matching parts of different lengths are selected. When the diameter of the pump body 1 is larger, the water pressure inside the pipeline also increases. In order to enable the rotating element 52 to adjust the pressure relief value, the length of the rotating element 52 will increase accordingly, and at the same time, the length of the movable rod 41 will also increase. When the length of the movable rod 41 increases, the adjustable pressure relief rated value also increases. According to different usage powers, different pressure relief rated values are adjusted.

[0049] When it is necessary to reduce the pressure rated value on the pressure relief mechanism 3, by rotating the rotating element 52 forward, during the rotation of the rotating element 52, it moves to the right. The rotating element 52 will push the movable element 53 to move to the right on the sliding element 51, and the movable element 53 will drive the support element 42 on the moving mechanism 4 to move. The support element 42 will move to the right on the movable rod 41, increasing the length of the left force arm of the movable rod 41 and decreasing the length of the right force arm. When the pressure relief mechanism 3 is triggered, the piston 32 moves downward and pushes the end of the movable rod 41 with a longer force arm. Only a smaller force is required to push the movable rod 41 to move, achieving a reduction in the pressure rated value.

[0050] When it is necessary to increase the pressure rated value on the pressure relief mechanism 3, by rotating the rotating element 52 backward, during the rotation of the rotating element 52, it moves to the left. The rotating element 52 will push the movable element 53 to move to the left on the sliding element 51, and the movable element 53 will drive the support element 42 on the moving mechanism 4 to move. The support element 42 will move to the left on the movable rod 41, decreasing the length of the left force arm of the movable rod 41 and increasing the length of the right force arm. When the pressure relief mechanism 3 is triggered, the piston 32 moves downward and pushes the end of the movable rod 41 with a shorter force arm. At this time, according to the lever principle, a larger thrust is required to push the movable rod 41 to move, achieving an increase in the pressure rated value.

[0051] Such as Figure 4 and Figure 10As shown, the height of the piston 32 is greater than the height of the rectangular through-hole 311 on the U-shaped pipe 31. A pressure-applying element 321 is arranged on one side of the piston 32, and the pressure-applying element 321 is located inside the rectangular through-hole 311. The pressure-applying element 321 is used to push the movable rod 41. The pressure-applying element 321 is in contact with the movable rod 41. As the piston 32 moves up and down, one end of the movable rod 41 is driven to move up and down, causing the other end of the movable rod 41 to move in the opposite direction. The height of the piston 32 being greater than the height of the rectangular through-hole 311 on the U-shaped pipe 31 is to increase the distance of the up-and-down movement of the piston 32 and enable the movable rod 41 to be quickly triggered to move. When the diameter of the pump body 1 is 30 cm, the water pressure inside the pipeline is relatively small, and the diameter of the movable rod 41 should be 2 cm, which can withstand the water pressure from the pressure relief mechanism 4. When the diameter of the pump body 1 is 60 cm, the water pressure inside the pipeline is relatively large, and the diameter of the movable rod 41 should be 4 cm, which can withstand greater pressure without breaking.

[0052] When the piston 32 moves downward or upward, the pressure-applying element 321 on the side of the piston 32 will always drive the movable rod 41 to move along with the movement of the piston 32. While realizing force transmission, it also realizes the adjustment of the rated pressure value.

[0053] The movable rod 41 is of a cylindrical structure and is made of ultra-high-strength steel. The diameter of the movable rod 41 is between 2 - 4 cm. The movable rod 41 is used as a lever and needs to withstand a large force. Therefore, the mechanical properties of the movable rod 41 must meet certain requirements because the movable rod 41 is made of ultra-high-strength steel.

[0054] As Figure 4 shown, elastic sealing material 6 is fixedly installed around one end of the movable rod 41 and the rectangular through-hole 311. The elastic sealing material 6 is made of rubber. The elastic sealing material 6 being fixedly installed around one end of the movable rod 41 and the rectangular through-hole 311 is to prevent the water in the U-shaped pipe 31 from entering the interior through the rectangular through-hole 311 and prevent the interior of the pump body 1 from being corroded by the water flow. When the water pressure is too high, the piston 32 may be pushed to the lowest end of the U-shaped rod by the strong water pressure. At this time, the top of the piston 32 will be lower than the top of the rectangular through-hole 311, and the water flow will flow into the interior of the pump body 1 through the rectangular through-hole 311, resulting in the interior of the pump body 1 being corroded by the water flow. The elastic sealing material 6 is specifically made of silicone rubber, and silicone rubber has good high-temperature resistance; silicone rubber has good chemical resistance and has good tolerance to most organic acids, alkalis, salts, and solvents.

[0055] As Figure 8As shown, a semi-circular groove 421 is provided at the top of the support element 42, and a rolling bead 43 is arranged on the support element 42. The rolling bead 43 is located within the semi-circular groove 421. The semi-circular groove 421 is for the sliding of the rolling bead 43. The rolling bead 43 is made of carbon steel material, and the dynamic friction coefficient of the rolling bead 43 is between 0.0015 and 0.0023. The carbon steel material has high strength and good corrosion resistance. When the support element 42 is moving, the rolling bead 43 on the support element 42 will slide within the arc-shaped groove 412 at the bottom of the movable rod 41. At the same time, when the movable rod 41 moves up and down, the rolling bead 43 on the support element 42 will also be used as a fulcrum. The diameter of the rolling bead 43 corresponds to the diameter of the pump body 1. When the internal pressure of the pipeline is small, a rolling bead 43 with a diameter of 0.5 cm is used, which can enable the support element 42 to slide quickly on the movable element 41 without jamming. When the internal pressure of the pipeline is large, a rolling bead 43 with a diameter of 0.8 cm needs to be used because when the water pressure is large, the top end of the support element 42 may undergo slight deformation due to excessive pressure, resulting in jamming of the smaller rolling bead 43 within the semi-circular groove 421.

[0056] As Figure 4 , Figure 5 , Figure 6 and Figure 8 shown, the rotating element 52 is of a cylindrical structure, and a thread 521 is provided on the rotating element 52. The length of the rotating element 52 is two-thirds of the length of the movable rod 41. The thread 521 provided on the rotating element 52 is to enable the rotating element 52 to move forward while rotating, and when subjected to other external forces, the rotating element 52 will not move in the reverse direction. The length of the rotating element 52 being two-thirds of the length of the movable rod 41 is to be able to move the support element 42 below the movable rod 41 to various positions below the movable rod 41. By adjusting the position of the support element 42, the force arms on both sides of the movable rod 41 are made different, thereby changing the rated value of the pressure.

[0057] As Figure 4 shown, a diversion pipe 7 is fixedly installed on the round hole 312 of the U-shaped pipe 31. The diversion pipe 7 is communicated with the bottom of the pump body 1, and the specific installation method is connected by welding. The diversion pipe 7 is to guide the water flow diverted within the U-shaped pipe 31 back to the bottom of the pump body 1. While relieving pressure, the water flow is led into the pipeline to prevent the water flow from entering the pump body 1 and causing corrosion and damage to the inside of the pump body 1.

[0058] The overall working process is as follows. First, the operator needs to adjust the pressure relief rating of the pump body 1. When a smaller rating needs to be adjusted, the operator uses a tool to rotate the rotating element 52 on the pressure relief mechanism 3 in the forward direction. During the rotation of the rotating element 52, it also moves to the right. The rotating element 52 will push the movable element 53 on the moving mechanism 4 to move to the right on the sliding element 51, and the movable element 53 will drive the supporting element 42 on the moving mechanism 4 to move to the right. The supporting element 42 will move to the right on the movable rod 41. At the same time, the rolling beads 43 on the supporting element 42 will roll in the arc-shaped groove 412 on the movable rod 41, causing the length of the lever arm on the left side of the movable rod 41 to increase and the length of the lever arm on the right side to decrease. After moving to the designated position, the pressure relief rating is set.

[0059] When the pipeline is blocked, the water pressure inside the pipeline will continue to rise due to the water hammer effect and the operation of the pump body 1, causing the water pressure inside the pipeline to rise rapidly. When the water pressure rises to a certain value, the water pressure inside the pipeline reaches the pressure relief rating, and the pressure relief mechanism 3 will be activated. The piston 32 will be pushed by the water flow under the larger water pressure. The piston 32 moves downward at one end of the U-shaped pipe 31 and compresses the elastic element 33 downward. When the top of the piston 32 is lower than the round hole 312 on the U-shaped pipe 31, the water flow will flow out from the round hole 312, flow through the round hole 312 to the diversion pipe 7, and finally guide the water flow back to the bottom of the pump body 1.

[0060] During this process, due to the downward movement of the piston 32, the pressure-applying element 321 on the piston 32 will drive the movable rod 41 on the moving mechanism 4 to move downward. The movable rod 41 will use the supporting element 42 as a fulcrum to perform a lever movement. The left side of the movable rod 41 moves downward, while the right side of the movable rod 41 moves upward. The ring 411 on the right side of the movable rod 41 will apply pressure to the clutch element 2, causing the motor shaft on the pump body 1 to be separated from the impeller and cutting off the power output to the impeller. As the water pressure inside the pipeline decreases, when the water pressure inside the pipeline is less than the pressure relief rating, the elastic element 33 will apply an upward force to the piston 32 through its elastic potential energy, causing the piston 32 to return to its original position. As a result, the water flow will not flow out from the round hole 312 of the U-shaped pipe 31. At the same time, one end of the left side of the movable rod 41 moves upward with the pressure-applying element 321 on the piston 32, causing the right side of the movable rod 41 to move downward. The ring 411 on the right side of the movable rod 41 will disengage from the clutch element 2, and the clutch element 2 will not be subjected to external pressure, causing the motor shaft on the pump body 1 to be reconnected to the impeller.

[0061] Embodiment 2: When a larger pressure relief rating is required, the operator adjusts the pressure relief mechanism 3 with a tool, and the size of the pressure relief rating will be adjusted according to the power of the water pump. When the power of the water pump during operation is large, the pressure relief rating will increase. When the pipeline is blocked internally, the water pressure inside the pipeline will rise rapidly. When it reaches the rated pressure value, the pressure relief mechanism 3 is triggered to start by the water flow pressure, and the excess pressure inside the pipeline is quickly relieved by the pressure relief mechanism 3. The pressure relief mechanism 3 will trigger the movement mechanism 4 to start, so that the movement mechanism 4 will drive the clutch element 2 to move, separating the rotating shaft of the motor on the pump body 1 from the impeller, cutting off the power output, ensuring that the impeller no longer rotates to increase the pressure, reducing the internal pressure of the pipeline, and at the same time preventing the water pressure from being too large to push the impeller to rotate and cause the motor to stall, thus avoiding damage.

[0062] Specific working principle: When a larger pressure relief rating is required, the operator reversely rotates the rotating element 52 on the pressure relief mechanism 3 with a tool. During the rotation of the rotating element 52, it moves to the left. The rotating element 52 will push the moving element 53 on the movement mechanism 4 to move to the left on the sliding element 51, and the moving element 53 will drive the supporting element 42 on the movement mechanism 4 to move to the left. The supporting element 42 will move to the left on the movable rod 41. At the same time, the rolling beads 43 on the supporting element 42 will roll in the arc-shaped groove 412 on the movable rod 41, reducing the length of the left arm of force and increasing the length of the right arm of force of the movable rod 41. After moving to the specified position, the pressure relief rating is set.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage pump pressure relief protection device, comprising a pump body (1), a clutch element (2), a pressure relief mechanism (3), a moving mechanism (4), an adjusting mechanism (5) and a control mechanism; characterized in that: A clutch element (2) is movably installed on the rotating shaft of the pump body (1), and the clutch element (2) is located between the motor and the impeller of the pump body (1); a pressure relief mechanism (3) is fixedly installed on one side of the bottom of the pump body (1), and the pressure relief mechanism (3) is used to drive and trigger the movement of the moving mechanism (4) by the pressure of the water flow, so as to ensure that while the pressure inside the pipeline is relieved, the load on the pump body (1) is reduced; a moving mechanism (4) is fixedly installed at the bottom of the pump body (1), and the moving mechanism (4) is used to transfer the pressure of the pressure relief mechanism (3) to the moving mechanism (4), so that the moving mechanism (4) moves and cuts off the power of the pump body (1); an adjusting mechanism (5) is fixedly installed below the moving mechanism (4), and the adjusting mechanism (5) is used to change the rated pressure on the pressure relief mechanism (3) by adjusting the moving mechanism (4), so as to change the pressure relief trigger value inside the pipeline; the pump body (1) is controlled by a control mechanism and is electrically connected to the control mechanism.

2. The pressure relief protection device for a sewage pump according to claim 1, characterized in that: The pressure relief mechanism (3) includes a U-shaped pipe (31), a piston (32) and an elastic element (33); a rectangular through hole (311) is formed on one side of the U-shaped pipe (31), a round hole (312) is formed on one side of the U-shaped pipe (31), and the round hole (312) is located above the rectangular through hole (311), the piston (32) is movably installed on one side of the rectangular through hole (311) on the U-shaped pipe (31), and the piston (32) is located above the rectangular through hole (311); one end of an elastic element (33) is fixedly installed at the bottom of the piston (32), and the other end of the elastic element (33) is fixedly installed at one end port of the U-shaped pipe (31).

3. The pressure relief protection device for a sewage pump according to claim 1, characterized in that: The moving mechanism (4) includes a movable rod (41) and a supporting element (42); the horizontal end of the movable rod (41) is located in the rectangular through hole (311) on the U-shaped pipe (31), the other end of the movable rod (41) is located below the rotating shaft inside the pump body (1), and a ring (411) is arranged at the other end of the movable rod (41), and the ring (411) is located on the rotating shaft of the pump body (1), an arc-shaped groove (412) is formed at the bottom of the movable rod (41), and the bottom of the movable rod (41) is movably installed on the supporting element (42).

4. A sewage pump pressure relief protection device according to claim 1, characterized in that: The adjusting mechanism (5) includes a sliding element (51), a rotating element (52) and a movable element (53); a rectangular groove (511) is formed on the sliding element (51), a movable element (53) is slidably installed on the sliding element (51), and a rotating element (52) is fixedly installed on one side of the sliding element (51).

5. The pressure relief protection device for a sewage pump according to claim 2, characterized in that: The height of the piston (32) is greater than the height of the rectangular through hole (311) on the U-shaped pipe (31), and a pressing element (321) is arranged on one side of the piston (32), and the pressing element (321) is located inside the rectangular through hole (311).

6. The pressure relief protection device for a sewage pump according to claim 3, characterized in that: The movable rod (41) is of a cylindrical structure, the movable rod (41) is made of ultra-high-strength steel, and the diameter of the movable rod (41) is between 2 - 4 cm.

7. The pressure relief protection device for a sewage pump according to claim 3, characterized in that: One end of the movable rod (41) and the periphery of the rectangular through-hole (311) are fixedly installed with an elastic sealing material (6), and the elastic sealing material (6) is made of rubber.

8. The pressure relief protection device for a sewage pump according to claim 3, characterized in that: A semi-circular groove (421) is formed at the top of the support element (42), a rolling bead (43) is arranged on the support element (42), the rolling bead (43) is located in the semi-circular groove (421), and the dynamic friction coefficient of the rolling bead (43) is between 0.0015 and 0.0023.

9. The pressure relief protection device for a sewage pump according to claim 4, characterized in that: The rotating element (52) is of a cylindrical structure, a thread (521) is formed on the rotating element (52), and the length of the rotating element (52) is two-thirds of the length of the movable rod (41).

10. The pressure relief protection device for a sewage pump according to claim 3, characterized in that: A diversion pipe (7) is fixedly installed on the round hole (312) of the U-shaped pipe (31), and the diversion pipe (7) is communicated with the bottom of the pump body (1).

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