Self-adaptive pressure regulation axially split pump device

Abstract

The invention relates to the technical field of fluid conveying, and discloses a self-adaptive pressure regulation axially split pump device. Comprising an axially split pump body, a main pipeline, an overpressure pipeline, a normal-pressure pipeline, a pressure detecting and triggering mechanism arranged in the main pipeline, an automatic closing mechanism arranged in the normal-pressure pipeline, a liquid flow regulating and controlling mechanism arranged in the overpressure pipeline and a driving mechanism arranged on the outer wall of the overpressure pipeline. By arranging a main circulation path composed of a main pipeline and a normal-pressure pipeline and a double-path layout with an overpressure pipeline as a bypass flow distribution structure and combining a pressure detection and triggering mechanism, an automatic closing mechanism, a driving mechanism and a liquid flow regulation and control mechanism which are in pure mechanical linkage, the purpose that the pressure detection and triggering mechanism, the automatic closing mechanism, the driving mechanism and the liquid flow regulation and control mechanism do not need external power and electronic control is achieved. Flow paths are automatically switched according to pipeline pressure changes, and the flow area is continuously adjusted, so that self-adaption, rapid and reliable adjustment and overpressure protection of the inlet pressure of the axially split pump are completed.

Description

Technical Field

[0001] This invention relates to the field of fluid transport technology, specifically to an adaptive pressure regulation pump start-up device. Background Technology

[0002] Split-case pumps (also known as split-case centrifugal pumps) are core equipment in fluid transport systems, widely used in water supply, drainage, industrial circulation, fire fighting, and irrigation due to their easy maintenance and stable operation. However, during actual operation, pressure fluctuations often occur within the transport pipeline due to system load changes, valve opening and closing, and parallel switching of multiple pumps. When the pressure exceeds the pressure limit of the pump body and pipeline, it can easily lead to problems such as pump body seal damage, pipeline joint leakage, increased vibration, and even equipment damage, seriously affecting the safe and stable operation of the system.

[0003] Currently, common methods for pressure regulation and overpressure protection of split-case pumps include: installing a mechanical safety valve or pressure relief valve on the outlet pipeline, which automatically opens to release pressure when it exceeds the set value; using an electric or pneumatic regulating valve in conjunction with a pressure sensor and controller to achieve closed-loop pressure control; or adjusting the pump speed through frequency conversion to control system pressure. However, these methods have certain limitations: although mechanical safety valves are simple in structure, they usually only have a pressure relief function and cannot achieve continuous adaptive pressure regulation, and manual intervention may be required after reset; control systems based on sensors and electric actuators have rapid response and high regulation accuracy, but rely on external power supply and signal transmission, limiting their applicability in explosion-proof environments, areas without electricity in the field, or occasions with extremely high reliability requirements, and are subject to risks such as circuit failure and signal interference; although frequency conversion can effectively regulate pressure, it is costly and has certain requirements on the pump's operating characteristics.

[0004] Furthermore, existing technologies lack purely mechanical structural solutions for adaptive pressure regulation of pipelines upstream of pumps. Most still rely on downstream valves or electronic controls, which are insufficient in terms of the integrated linkage of pressure sensing, path switching, and flow regulation. It is difficult to achieve fast, reliable, and adaptive pressure regulation and overpressure protection without an external power source.

[0005] Therefore, there is an urgent need to propose a pressure adaptive regulating device that is simple in structure, requires no external power, and can automatically switch the flow path and adjust the flow area according to changes in pipeline pressure. This device should be integrated into the inlet pipeline of a split-case pump to achieve reliable, fast, and maintenance-free overpressure protection and pressure stabilization functions. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an adaptive pressure regulating split-case pump device, which solves the problem that split-case pumps cannot achieve adaptive pressure regulation and reliable overpressure protection through pure mechanical linkage under conditions of no external power and electronic control.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an adaptive pressure regulating split-case pump device, comprising a split-case pump body, a main pipeline, an overpressure pipeline, an atmospheric pressure pipeline, a pressure detection and triggering mechanism located within the main pipeline, an automatic shut-off mechanism located within the atmospheric pressure pipeline, a flow control mechanism located within the overpressure pipeline, and a drive mechanism located on the outer wall of the overpressure pipeline; the inlet end of the split-case pump body is detachably connected to the outlet end of the overpressure pipeline via a flange, the inlet end of the overpressure pipeline is fixedly connected to the main pipeline, the main pipeline and the overpressure pipeline are interconnected and fixedly connected via the atmospheric pressure pipeline, the inlet end of the atmospheric pressure pipeline is close to the inlet end of the main pipeline, and the overpressure pipeline is located at the end of the main pipeline, forming a main flow path composed of the main pipeline and the atmospheric pressure pipeline, with the overpressure pipeline serving as a bypass diversion structure; the pressure detection and triggering mechanism, the automatic shut-off mechanism, the drive mechanism, and the flow control mechanism are linked through a mechanical structure to achieve adaptive pressure regulation.

[0008] Preferably, the pressure detection and triggering mechanism includes a movable plug that slides and seals against the inner wall of the main pipe. The movable plug is rigidly connected to one end of a moving rod. A compression chamber is coaxially fixedly installed at the end of the main pipe. A compression disc and a spring are fitted inside the compression chamber. The spring is fitted onto the outer diameter of the moving rod, and both ends of the spring abut against the inner wall of the compression chamber and one side of the compression disc, respectively. The compression disc is coaxially fitted onto the moving rod and fixedly connected to the outer diameter of the moving rod. An annular limiting ring is coaxially fixed to the inner wall of the main pipe. The annular limiting ring is located on the side of the movable plug near the inlet end of the main pipe.

[0009] Preferably, the outer peripheral wall of the movable plug is fitted with a PTFE sealing ring, the inner diameter of the annular limiting ring is smaller than the outer diameter of the movable plug, and the end face of the annular limiting ring is provided with a buffer rubber layer, and the spring is made of fatigue-resistant elastic material.

[0010] Preferably, the outlet end of the atmospheric pressure pipeline is fixed to the wall of the overpressure pipeline, and the outlet opening is located upstream of the liquid flow control mechanism inside the overpressure pipeline; the automatic closing mechanism includes a guide sleeve located at the central axis of the atmospheric pressure pipeline. The guide sleeve is fixedly connected to the wall of the atmospheric pressure pipeline by multiple circumferentially evenly distributed support rods. The guide sleeve is hollow inside and contains a second spring and a piston rod. The piston rod is located on the side of the second spring near the inlet end of the atmospheric pressure pipeline, and the piston rod slides with the inner diameter of the guide sleeve. The end of the piston rod near the inlet end of the atmospheric pressure pipeline extends to the outside of the guide sleeve and is fixedly connected to a valve disc. The outer diameter of the valve disc is adapted to the inner diameter of the inlet end of the atmospheric pressure pipeline.

[0011] Preferably, the support rod is provided with 3 rods, the contact end face of the valve disc is provided with a silicone rubber sealing ring, the outer wall of the piston rod is provided with an axial guide groove, the inner wall of the guide sleeve is provided with a guide protrusion adapted to the axial guide groove, and the second spring is made of fatigue-resistant elastic material.

[0012] Preferably, the fluid flow control mechanism includes a central block fixed at the central axis of the overpressure pipeline. Multiple circumferentially distributed rotating support rods are rotatably connected to the outer periphery of the central block using an embedded structure. The upper end of each rotating support rod away from the central block is fixedly connected to a blade. The side of each blade closest to the overpressure pipeline wall is fixedly connected to a rotating support rod. The rotating support rod penetrates the overpressure pipeline wall and is rotatably connected to it. The extended end of the rotating support rod extending beyond the outer wall of the overpressure pipeline is fixedly connected to a strip-shaped positioning block. A groove is provided on the inner side of the strip-shaped positioning block, and the groove slides in conjunction with one end of a T-shaped guide rod. The other ends of all the T-shaped guide rods are connected to a ring plate surrounding the outer periphery of the overpressure pipeline, and a gap is maintained between the ring plate and the outer wall of the overpressure pipeline.

[0013] Preferably, the blades are provided in a circular and uniformly distributed manner, and the surface of the blades adopts a streamlined design; the embedded rotational connection between the first rotating support rod and the shaft block, and the rotational connection between the second rotating support rod and the wall of the overpressure pipeline, are both made of rolling bearings, and the bearings are filled with long-life grease; the groove of the T-shaped guide rod and the strip positioning block is provided with a wear-resistant bushing.

[0014] Preferably, the driving mechanism includes an L-shaped bracket fixedly connected to the outer wall of the overpressure pipeline, an annular gear ring rotatably connected to the outer wall of the overpressure pipeline, the annular gear ring having an external tooth structure and being fixedly connected to a ring plate; the horizontal section of the L-shaped bracket is provided with a sliding groove, a rack is slidably installed in the sliding groove, the rack and the annular gear ring are driven by a reversing idler gear, the reversing idler gear is rotatably connected to the L-shaped bracket through a connecting rod, and the extended end of the moving rod is fixedly connected to the rack through a stainless steel synchronizing rod, the stroke of the stainless steel synchronizing rod is limited by a limiting block fixed to the end of the moving rod, the limiting block being fixedly connected to the moving rod.

[0015] Preferably, a guide roller is provided at the mating point between the rack and the sliding groove, the module of the reversing idler wheel is the same as the module of the rack and the ring gear, and the rotatable connection between the connecting rod and the L-shaped bracket adopts a self-lubricating bushing.

[0016] Preferably, the flange connection surface between the split-case pump body and the overpressure pipeline is provided with a rubber sealing gasket, and the bolts are evenly distributed and tightened; the main pipeline, overpressure pipeline, and normal pressure pipeline are all made of 304 stainless steel.

[0017] This invention provides an adaptive pressure regulation pump start-up device. It has at least the following beneficial effects: 1. This invention, by setting up a main flow path consisting of a main pipeline and an atmospheric pressure pipeline, and a dual-path layout with an overpressure pipeline as a bypass diversion structure, and combining a purely mechanically linked pressure detection and triggering mechanism, an automatic shut-off mechanism, a drive mechanism, and a fluid flow control mechanism, achieves automatic switching of the flow path and continuous adjustment of the flow area according to changes in pipeline pressure without the need for external power and electronic control. This enables adaptive, rapid, and reliable adjustment of the inlet pressure of the split-case pump and overpressure protection.

[0018] 2. This invention adopts a pure mechanical transmission and linkage design with the liquid flow pressure as the sole driving force. The entire process of pressure detection and triggering, flow path switching, throttling adjustment and reset does not require the intervention of power supply, sensors or controllers. The structure is simple and reliable with a low failure rate. It is suitable for special environments such as explosion-proof, power-free or high reliability requirements, and has low maintenance costs and good long-term operational stability.

[0019] 3. This invention uses the meshing transmission of gear rack and reversing idler wheel to accurately convert the linear displacement of the moving rod into the rotational motion of the ring plate, thereby linearly controlling the opening and closing angle of the blades. This achieves a precise and linear correspondence between the pressure signal and the throttling area, ensuring a smooth adjustment process, effectively suppressing eddies and pressure shocks, and improving the accuracy of pressure regulation and the safety of system operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top cross-sectional view of the main pipeline, compression chamber, and atmospheric pressure pipeline of the present invention. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a three-dimensional structural diagram of the main pipeline, the high-pressure pipeline, and the normal-pressure pipeline of the present invention; Figure 5 This is a three-dimensional structural diagram of the overpressure pipeline section of the present invention; Figure 6 This is a three-dimensional structural diagram of the overpressure pipeline section of the present invention from another perspective; Figure 7 This is a schematic diagram of the main structure of the overpressure supertube of the present invention; Figure 8 This is a schematic diagram of the fluid flow control mechanism and drive mechanism of the present invention.

[0021] The components include: 1. Main pipeline; 101. Annular limiting ring; 102. Movable plug; 103. Movable rod; 104. Compression chamber; 105. Compression disc; 106. Spring 1; 2. Overpressure pipeline; 201. Shaft block; 202. Rotating support rod 1; 203. Blade; 204. Rotating support rod 2; 205. Strip positioning block; 206. T-shaped guide rod; 207. Ring plate; 3. L-shaped bracket; 301. Rack; 302. Reversing idler wheel; 303. Connecting rod; 304. Annular gear ring; 4. Normal pressure pipeline; 401. Guide sleeve; 402. Support rod; 403. Spring 2; 404. Piston rod; 405. Valve disc; 5. Limiting block; 6. Stainless steel synchronizing rod; 7. Split-case pump body. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Reference Appendix Figure 1 This embodiment of an adaptive pressure regulating split-opening pump device includes a split-opening pump body 7, a main pipeline 1, an overpressure pipeline 2, an atmospheric pressure pipeline 4, a pressure detection and triggering mechanism in the main pipeline 1, an automatic shut-off mechanism in the atmospheric pressure pipeline 4, a fluid flow control mechanism in the overpressure pipeline 2, and a drive mechanism on the outer wall of the overpressure pipeline 2. The inlet end of the split-opening pump body 7 is detachably connected to the outlet end of the overpressure pipeline 2 via a flange. The inlet end of the overpressure pipeline 2 is fixedly connected to the main pipeline 1. The main pipeline 1 and the overpressure pipeline 2 are interconnected and fixedly connected via an atmospheric pressure pipeline 4. The inlet end of the atmospheric pressure pipeline 4 is close to the inlet end of the main pipeline 1, and the overpressure pipeline 2 is located at the end of the main pipeline 1, forming a main flow path composed of the main pipeline 1 and the atmospheric pressure pipeline 4, with the overpressure pipeline 2 as a bypass diversion structure. In this embodiment, it is necessary to specifically explain that a dual-flow path layout of "main path + bypass" is adopted. Under normal working conditions, the main flow path main pipeline 1 and atmospheric pressure pipeline 4 undertake the main liquid flow transportation task to ensure transportation efficiency. Under overpressure conditions, it automatically switches to the bypass diversion structure overpressure pipeline 2, and achieves pressure regulation through throttling and pressure relief. Through functional zoning design, path switching can be completed without manual intervention, realizing the coordination of normal transportation and overpressure protection, and adapting to the usage requirements of different pressure conditions. This embodiment further illustrates that the flange connection surface between the split-case pump body 7 and the overpressure pipeline 2 is provided with a rubber sealing gasket, and the bolts are evenly distributed and tightened to ensure the sealing performance of the connection and prevent liquid leakage; the main pipeline 1, the overpressure pipeline 2, and the normal pressure pipeline 4 are all made of 304 stainless steel, which has the characteristics of corrosion resistance and high strength, and is suitable for long-term use in humid environments.

[0024] Reference Appendix Figures 2-4 The main pipeline 1 is equipped with a pressure detection and triggering mechanism, which includes a movable plug 102 that is slidably sealed to the inner wall of the main pipeline 1. The movable plug 102 is rigidly connected to one end of the movable rod 103. A compression chamber 104 is coaxially fixedly installed at the end of the main pipeline 1. A compression disc 105 and a spring 106 are fitted inside the compression chamber 104. The spring 106 is fitted on the outer diameter of the movable rod 103, and the two ends of the spring 106 respectively abut against the inner wall of the compression chamber 104 and one side of the compression disc 105. The compression disc 105 is coaxially fitted on the movable rod 103 and fixedly connected to the outer diameter of the movable rod 103. An annular limiting ring 101 is coaxially fixed to the inner wall of the main pipeline 1. The annular limiting ring 101 is located on the side of the movable plug 102 near the inlet end of the main pipeline 1. In this embodiment, it should be specifically explained that the movable plug 102 directly bears the pressure of the liquid flow in the main pipeline 1. The preload of the spring 106 is set to the safe pressure threshold of the split-case pump body 7. When the liquid pressure does not exceed the threshold, the spring 106 supports the movable plug 102 to maintain its initial position through the compression plate 105 and the movable rod 103. When the pressure exceeds the threshold, the thrust of the liquid flow on the movable plug 102 overcomes the preload of the spring 106 and pushes the movable plug 102 to slide along the axial direction of the main pipeline 1, realizing the integrated action of pressure detection and triggering. Through the pure mechanical pressure sensing design, the response is direct and without delay, and no electronic sensor is required, which improves the structural reliability. This embodiment further illustrates that the outer peripheral wall of the movable plug 102 is fitted with a PTFE sealing ring, which forms a sliding seal with the inner wall of the main pipe 1. This ensures the accuracy of liquid pressure transmission and prevents liquid leakage from the gap between the movable plug 102 and the inner wall of the pipe. The inner diameter of the annular limiting ring 101 is slightly smaller than the outer diameter of the movable plug 102, and its end face is provided with a buffer rubber layer to limit the initial limit position of the movable plug 102, while preventing the movable plug 102 from rigidly colliding with the inner wall of the pipe when it resets. Furthermore, spring 106 is made of fatigue-resistant elastic material. When there are issues such as decreased accuracy of preload, reduced pressure detection sensitivity, or delayed mechanism response, it needs to be replaced promptly. The reason for replacement is that spring 106 is in a state of repeated compression-reset operation for a long time, which will gradually lead to elastic fatigue. If it is not replaced in time, it may cause overpressure protection failure and fail to effectively avoid the risk of overpressure in the connecting pipeline structure. Although the replacement structure of spring 106 is not shown in the accompanying drawings of this invention, the disassembly and replacement of springs are conventional technical means in this field, and will not be described in detail in this embodiment.

[0025] Reference Appendix Figures 2-4 The outlet end of the atmospheric pressure pipeline 4 is fixed to the wall of the overpressure pipeline 2, and the outlet opening is located in the upstream area of ​​the liquid flow control mechanism inside the overpressure pipeline 2. The atmospheric pressure pipeline 4 is equipped with an automatic closing mechanism, which includes a guide sleeve 401 located at the central axis of the atmospheric pressure pipeline 4. The guide sleeve 401 is fixedly connected to the wall of the atmospheric pressure pipeline 4 by multiple support rods 402 evenly distributed in a circle. The guide sleeve 401 is hollow inside and is equipped with a second spring 403 and a piston rod 404. The piston rod 404 is located on the side of the second spring 403 near the inlet end of the atmospheric pressure pipeline 4. The piston rod 404 is slidably engaged with the inner diameter of the guide sleeve 401. The end of the piston rod 404 near the inlet end of the atmospheric pressure pipeline 4 extends to the outside of the guide sleeve 401 and is fixedly connected to the valve disc 405. The outer diameter of the valve disc 405 is adapted to the inner diameter of the inlet end of the atmospheric pressure pipeline 4. In this embodiment, it should be specifically explained that the preload of spring 403 continuously pushes piston rod 404, keeping valve disc 405 open and ensuring normal flow in atmospheric pressure pipeline 4. When the pressure in main pipeline 1 exceeds the safe pressure threshold of pump body 7, the thrust of liquid flow through the inlet end of atmospheric pressure pipeline 4 on valve disc 405 overcomes the preload of spring 403, pushing valve disc 405 to move towards the inlet end of pipeline and fit the end face, realizing automatic closure of atmospheric pressure pipeline 4. Through the pressure-driven automatic closure design, it responds synchronously with the pressure detection mechanism, quickly cutting off the main flow path, creating favorable conditions for throttling and depressurizing of overpressure pipeline 2. The structure is simple and the closure reliability is high. This embodiment further illustrates that three support rods 402 are evenly distributed in a 120-degree circle, which not only ensures the stability of the guide sleeve 401 but also minimizes the obstruction to the liquid flow in the atmospheric pressure pipeline 4. The contact end face of the valve disc 405 is provided with a silicone rubber sealing ring. When the valve disc 405 is closed, the sealing ring is tightly fitted with the end face of the inlet end of the atmospheric pressure pipeline 4 to achieve zero leakage sealing. The outer wall of the piston rod 404 is provided with an axial guide groove, and the inner wall of the guide sleeve 401 is provided with a corresponding guide protrusion to ensure that the piston rod 404 does not deflect during sliding and improve the coaxiality of the valve disc 405 when it is closed. Furthermore, spring 403 is made of fatigue-resistant elastic material. When there are issues such as decreased accuracy of preload, untimely response of automatic closing mechanism, improper opening or closing of valve disc 405, or sealing failure, it needs to be replaced in a timely manner. The reason for replacement is that spring 403 is in a cyclical working state of repeated compression and reset for a long time, which will gradually cause elastic fatigue. If it is not replaced in time, effective on / off control of atmospheric pressure pipeline 4 cannot be achieved, affecting the adjustment reliability of the entire pressure regulating structure. Although the replacement structure of spring 403 is not shown in the accompanying drawings of this invention, the disassembly and replacement of springs are conventional technical means in this field, and will not be described in detail in this embodiment.

[0026] Reference Appendix Figure 5-8 The overpressure pipeline 2 is equipped with a fluid flow control mechanism. The fluid flow control mechanism includes a central block 201 fixed at the central axis of the pipeline. The outer periphery of the central block 201 is rotatably connected to multiple rotating support rods 202 evenly distributed in a circle. The upper end of each rotating support rod 202 away from the central block 201 is fixedly connected to a blade 203. The side of each blade 203 near the pipe wall of the overpressure pipeline 2 is fixedly connected to a rotating support rod 204. The rotating support rod 204 penetrates the pipe wall of the overpressure pipeline 2 and is rotatably connected to the pipe wall. The extended end of the rotating support rod 204 extending out of the outer wall of the overpressure pipeline 2 is fixedly connected to a strip positioning block 205. The inner side of the strip positioning block 205 is provided with a sliding groove. The sliding groove is slidably engaged with one end of a T-shaped guide rod 206. The other ends of all T-shaped guide rods 206 are connected to a ring plate 207 surrounding the outer periphery of the overpressure pipeline 2. A gap is maintained between the ring plate 207 and the outer wall of the overpressure pipeline 2 to ensure that the ring plate 207 can rotate. In this embodiment, it should be specifically explained that when the ring plate 207 rotates, the T-shaped guide rod 206 cooperates with the groove of the strip positioning block 205 to convert the circular motion into the swing motion of the strip positioning block 205, which in turn drives the rotating support rod 204 to rotate. The blade 203 swings synchronously with the connection point between the rotating support rod 202 and the shaft block 201 as the axis, thereby adjusting the opening and closing angle and ultimately changing the flow cross-sectional area of ​​the overpressure pipeline 2. Through the multi-blade synchronous adjustment design, the liquid flow is throttled evenly, effectively suppressing the generation of eddies. At the same time, the rotating connection structure reduces frictional resistance and improves the smoothness of adjustment. This embodiment further illustrates that six blades 203 are provided, evenly distributed around the circumference. The surface of the blades 203 adopts a streamlined design to reduce fluid flow resistance and erosion. The embedded rotational connection between the rotating support rod 202 and the shaft block 201, and the rotational connection between the rotating support rod 204 and the wall of the overpressure pipeline 2, both adopt rolling bearings. The bearings are filled with long-lasting grease to reduce the coefficient of rotational friction and avoid jamming. The groove of the T-shaped guide rod 206 and the strip positioning block 205 is provided with a wear-resistant bushing to improve the wear resistance of the sliding fit and extend the service life.

[0027] Reference Appendix Figure 8 The driving mechanism is set on the outer wall of the overpressure pipe 2, including an L-shaped bracket 3 fixedly connected to the outer wall of the overpressure pipe 2. An annular gear ring 304 is rotatably connected to the outer wall of the overpressure pipe 2. The annular gear ring 304 has an external tooth structure and is fixedly connected to the ring plate 207 to achieve synchronous rotation of the two. The horizontal section of the L-shaped bracket 3 is provided with a sliding groove. A rack 301 is slidably installed in the sliding groove. The rack 301 and the annular gear ring 304 are driven by a reversing idler wheel 302. The reversing idler wheel 302 is rotatably connected to the L-shaped bracket 3 through a connecting rod 303. The extended end of the moving rod 103 is fixedly connected to the rack 301 through a stainless steel synchronous rod 6. The stroke of the stainless steel synchronous rod 6 is limited by a limiting block 5 fixed to the end of the moving rod 103. The limiting block 5 is fixedly connected to the moving rod 103. In this embodiment, it should be specifically explained that the axial linear motion of the moving rod 103 is transmitted to the rack 301 through the stainless steel synchronous rod 6. The rack 301 moves linearly along the sliding groove. Through the meshing transmission of the reversing idler wheel 302, the linear motion is converted into the circumferential motion of the ring gear 304, which in turn drives the ring plate 207 to rotate synchronously, realizing the conversion of power transmission and motion form. Through the gear meshing transmission design, the transmission ratio is accurate, ensuring that the displacement of the moving rod 103 corresponds linearly with the opening and closing angle of the blade 203, improving the pressure control accuracy, and the failure rate of pure mechanical transmission is low. This embodiment further illustrates that a guide roller is provided at the mating point between the rack 301 and the sliding groove to convert sliding friction into rolling friction and reduce motion resistance; the module of the reversing idler wheel 302 is consistent with the module of the rack 301 and the ring gear 304 to ensure the smoothness and accuracy of the meshing transmission; the rotatable connection between the connecting rod 303 and the L-shaped bracket 3 adopts a self-lubricating bushing, which does not require additional lubricant and is easy to maintain.

[0028] Reference Appendix Figure 1-8 The entire execution process of the device is based on the pressure change in the main pipeline 1 as the core trigger signal. It is executed in the logical sequence of "pressure detection and triggering - closing of atmospheric pressure pipeline 4 - drive mechanism transmission - fluid flow regulation and throttling - pressure drop - mechanism reset - device resumes normal operation". The pressure detection and triggering mechanism, automatic closing mechanism, drive mechanism and fluid flow regulation mechanism are mechanically connected through components such as moving rod 103, stainless steel synchronous rod 6, and T-shaped guide rod 206 to achieve seamless connection of actions. The specific execution process is divided into seven steps that proceed in sequence. This embodiment requires specific explanation of its complete linkage mechanism. Its core principle relies on a purely mechanical structure design, using the liquid flow's own pressure as the sole driving force, without the need for external power supply, sensors, or electronic control systems. The pressure detection and triggering mechanism within the main pipeline 1 senses pressure changes in real time. When the pressure exceeds the limit, it triggers the automatic shut-off mechanism within the normal pressure pipeline 4 to close the normal pressure pipeline 4. Simultaneously, the driving mechanism converts linear motion into circular motion, driving the liquid flow control mechanism within the overpressure pipeline 2 to adjust the opening angle of the blades 203, achieving throttling and pressure relief of the overpressure liquid flow. After the pressure drops below the safety threshold, the springs 106 and 403... Under the pre-tightening force, each mechanism resets sequentially, the atmospheric pressure pipeline 4 reopens, the overpressure pipeline stops throttling, and then returns to normal operating conditions. The entire process achieves adaptive, passive, and continuous pressure regulation, ensuring the safe operation of the split-case pump and all pipelines. Based on the above principle, the beneficial effects of this linkage mechanism are that it requires no manual operation or external energy supply, making it suitable for fluid transportation applications requiring explosion-proof or high-reliability conditions, or remote areas without electricity. The linkage action is rapid and seamless, quickly completing pressure regulation and effectively avoiding damage to equipment caused by overpressure. The purely mechanical structure has a low failure rate and low maintenance cost, enabling long-term stable operation and improving the overall reliability and economy of fluid transportation. This embodiment further illustrates that, in step S1: when the split-case pump body 7 is operating normally and the liquid pressure in the connecting pipeline structure does not exceed the safety pressure threshold, the preload of spring 106 maintains the moving plug 102 in the initial position, the preload of spring 2403 maintains the valve disc 405 in the open state, the atmospheric pressure pipeline 4 remains open, the liquid is transported through the main pipeline 1 and flows through the atmospheric pressure pipeline 4 to the front end of the overpressure pipeline 2, and is transported through the inside of the overpressure pipeline 2 to the inlet end of the split-case pump body 7, thus ensuring the fluid transport efficiency under normal operating conditions; Step S2: When the pressure rises abnormally and exceeds the safe pressure threshold, the thrust of the liquid flow on the front surface of the movable plug 102 overcomes the preload of the spring 106, and at the same time, the thrust of the liquid flow on the valve disc 405 overcomes the preload of the spring 203, causing the movable plug 102 to slide along the main pipeline 1 axially toward the compression chamber 104, and the valve disc 405 moves and fits the end face, closing the inlet end of the atmospheric pressure pipeline 4, and quickly completing the switching of the flow path; Step S3: When the inlet end of the atmospheric pressure pipeline 4 is closed, the movable plug 102 slides axially, and the stainless steel synchronous rod 6 moves synchronously through the rigidly connected movable rod 103. The stainless steel synchronous rod 6 pulls the rack 301 to move linearly along the sliding groove of the L-shaped bracket 3 towards the overpressure pipeline 2, so as to realize the transmission of pressure trigger signal to mechanical power. Step S4: When the rack 301 moves forward in a straight line along the sliding groove, its teeth mesh with the teeth of the reversing idler wheel 302. The driving force drives the reversing idler wheel 302 to rotate around the axis of the connecting rod 303. Since the teeth on the other side of the reversing idler wheel 302 precisely mesh with the outer teeth of the ring gear 304, the rotating reversing idler wheel 302 drives the ring gear 304 to rotate around the axis of the overpressure pipe 2 in the opposite direction. The ring gear 304 is fixedly connected to the ring plate 207, thereby driving the ring plate 207 to rotate synchronously. Step S5: When the ring plate 207 rotates, the T-shaped guide rod 206, which is fixedly connected, pushes the strip positioning block 205 to swing around the axis of the rotating support rod 204. The strip positioning block 205 drives the rotating support rod 204 to swing around its rotating connection point with the wall of the overpressure pipe 2. The rotating support rod 204 drives the blade 203 to swing synchronously around the connection point between the rotating support rod 202 and the shaft block 201, thereby reducing the opening and closing angle of the blade 203. Step S6: As the opening angle of the blade 203 continues to decrease, the flow cross-sectional area of ​​the overpressure pipe 2 gradually decreases, forming a dynamic throttling effect on the overpressure liquid flow entering the overpressure pipe 2, reducing the flow velocity and pressure of the liquid flow, and allowing the liquid pressure in the connecting pipe structure to gradually drop back to a safe range through throttling and pressure relief. Step S7: When the liquid pressure in the connecting pipeline structure drops below the safe pressure threshold, the preload of spring 106 pushes the compression disc 105, the moving rod 103 and the moving plug 102 back to their initial positions. The preload of spring 2403 pushes the piston rod 404 and the valve disc 405 back to their open state. Under the pull of the moving rod 103, the rack 301 moves backward along the sliding groove towards the main pipeline 1, causing the reversing idler wheel 302 to rotate in the opposite direction, which in turn drives the annular gear ring 304 to rotate in the opposite direction. The blade 203 returns to its initial opening, the normal pressure pipeline 4 reopens, the overpressure pipeline 2 stops throttling, and then the device returns to normal operating conditions.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adaptive pressure regulation start-up pump device, characterized in that, The system includes a split-case pump body (7), a main pipeline (1), an overpressure pipeline (2), an atmospheric pressure pipeline (4), a pressure detection and triggering mechanism located in the main pipeline (1), an automatic shut-off mechanism located in the atmospheric pressure pipeline (4), a flow control mechanism located in the overpressure pipeline (2), and a drive mechanism located on the outer wall of the overpressure pipeline (2). The inlet end of the split-case pump body (7) is detachably connected to the outlet end of the overpressure pipeline (2) via a flange, and the inlet end of the overpressure pipeline (2) is fixedly connected to the main pipeline (1). The main pipeline (1) and the overpressure pipeline (2) are interconnected and fixedly connected by the normal pressure pipeline (4). The inlet end of the normal pressure pipeline (4) is close to the inlet end of the main pipeline (1), and the overpressure pipeline (2) is located at the end of the main pipeline (1), forming a main flow path composed of the main pipeline (1) and the normal pressure pipeline (4), with the overpressure pipeline (2) as a bypass diversion structure. The pressure detection and triggering mechanism, the automatic shut-off mechanism, the drive mechanism, and the liquid flow control mechanism are linked through mechanical structure to achieve adaptive pressure adjustment.

2. The adaptive pressure regulation start-up pump device according to claim 1, characterized in that, The pressure detection and triggering mechanism includes a movable plug (102) that slides and seals against the inner wall of the main pipe (1). The movable plug (102) is rigidly connected to one end of a movable rod (103). A compression chamber (104) is coaxially fixedly installed at the end of the main pipe (1). A compression disc (105) and a spring (106) are fitted inside the compression chamber (104). The spring (106) is fitted on the outer diameter of the movable rod (103), and the two ends of the spring (106) abut against the inner wall of the compression chamber (104) and one side of the compression disc (105), respectively. The compression disc (105) is coaxially fitted on the movable rod (103) and fixedly connected to the outer diameter of the movable rod (103). An annular limiting ring (101) is coaxially fixed on the inner wall of the main pipe (1). The annular limiting ring (101) is located on the side of the movable plug (102) near the inlet end of the main pipe (1).

3. The adaptive pressure regulation start-up pump device according to claim 2, characterized in that, The outer peripheral wall of the movable plug (102) is fitted with a PTFE sealing ring, the inner diameter of the annular limiting ring (101) is smaller than the outer diameter of the movable plug (102), and the end face of the annular limiting ring (101) is provided with a buffer rubber layer. The spring (106) is made of fatigue-resistant elastic material.

4. The adaptive pressure regulation pump start-up device according to claim 1, characterized in that, The outlet end of the atmospheric pressure pipeline (4) is fixed to the wall of the overpressure pipeline (2), and the outlet opening is located upstream of the liquid flow control mechanism inside the overpressure pipeline (2); the automatic closing mechanism includes a guide sleeve (401) located at the central axis of the atmospheric pressure pipeline (4), the guide sleeve (401) is fixedly connected to the wall of the atmospheric pressure pipeline (4) by multiple support rods (402) evenly distributed in a circle, the guide sleeve (401) is hollow inside, and the guide sleeve (401) is provided with a spring. Spring 2 (403) and piston rod (404), wherein the piston rod (404) is located on the side of spring 2 (403) near the inlet end of the atmospheric pressure pipe (4), and the piston rod (404) is slidably fitted with the inner diameter of the guide sleeve (401). The end of the piston rod (404) near the inlet end of the atmospheric pressure pipe (4) extends to the outside of the guide sleeve (401) and is fixedly connected to the valve disc (405). The outer diameter of the valve disc (405) is adapted to the inner diameter of the inlet end of the atmospheric pressure pipe (4).

5. The adaptive pressure regulation start-up pump device according to claim 4, characterized in that, The support rod (402) is provided with 3 rods, the valve disc (405) has a silicone rubber sealing ring on its mating end face, the piston rod (404) has an axial guide groove on its outer wall, the guide sleeve (401) has a guide protrusion on its inner wall that is adapted to the axial guide groove, and the second spring (403) is made of fatigue-resistant elastic material.

6. The adaptive pressure regulation start-up pump device according to claim 1, characterized in that, The fluid flow control mechanism includes a core block (201) fixed at the central axis of the overpressure pipe (2). Multiple circumferentially distributed rotating support rods (202) are rotatably connected to the core block (201) via an embedded structure. The upper end of each rotating support rod (202) away from the core block (201) is fixedly connected to a blade (203). The side of each blade (203) closest to the wall of the overpressure pipe (2) is fixedly connected to a rotating support rod (204). The rotating support rod (204) extends out of the outer wall of the overpressure pipe (2) and is rotatably connected to the pipe wall. The extended end of the rotating support rod (204) is fixedly connected to the strip positioning block (205). The inner side of the strip positioning block (205) is provided with a sliding groove. The sliding groove is slidably engaged with one end of the T-shaped guide rod (206). The other ends of all the T-shaped guide rods (206) are connected to the ring plate (207) surrounding the outer periphery of the overpressure pipe (2). The ring plate (207) maintains a gap with the outer wall of the overpressure pipe (2).

7. The adaptive pressure regulation start-up pump device according to claim 6, characterized in that, The blade (203) has 6 blades, which are evenly distributed in a circle, and the surface of the blade (203) adopts a streamlined design; the embedded rotational connection between the first rotating support rod (202) and the shaft block (201) and the rotational connection between the second rotating support rod (204) and the wall of the overpressure pipe (2) are all made of rolling bearings, and the bearings are filled with long-lasting grease; the groove of the T-shaped guide rod (206) and the strip positioning block (205) is provided with a wear-resistant bushing.

8. The adaptive pressure regulation start-up pump device according to claim 7, characterized in that, The driving mechanism includes an L-shaped bracket (3) fixedly connected to the outer wall of the overpressure pipe (2). The outer wall of the overpressure pipe (2) is rotatably connected to an annular gear ring (304). The annular gear ring (304) has an external tooth structure and is fixedly connected to the ring plate (207). The horizontal section of the L-shaped bracket (3) is provided with a sliding groove. A rack (301) is slidably installed in the sliding groove. The rack (301) and the annular gear ring (304) are driven by a reversing idler wheel (302). The reversing idler wheel (302) is rotatably connected to the L-shaped bracket (3) through a connecting rod (303). The extended end of the moving rod (103) is fixedly connected to the rack (301) through a stainless steel synchronizing rod (6). The stroke of the stainless steel synchronizing rod (6) is limited by a limiting block (5) fixed to the end of the moving rod (103). The limiting block (5) is fixedly connected to the moving rod (103).

9. The adaptive pressure regulating start-up pump device according to claim 8, characterized in that, The rack (301) is provided with a guide roller at the joint with the sliding groove. The module of the reversing idler wheel (302) is the same as that of the rack (301) and the ring gear (304). The rotating connection between the connecting rod (303) and the L-shaped bracket (3) adopts a self-lubricating bushing.

10. The adaptive pressure regulation start-up pump device according to claim 1, characterized in that, The flange connection between the split-case pump body (7) and the overpressure pipeline (2) is provided with a rubber sealing gasket, and the bolts are evenly distributed and tightened; the main pipeline (1), the overpressure pipeline (2), and the normal pressure pipeline (4) are all made of 304 stainless steel.

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