A pump protection valve

Abstract

The utility model discloses a pump protection valve relates to pump protection valve technical field, the utility model discloses a pump protection valve includes the valve body, is provided with the import with the pump intercommunication, the export with the main road intercommunication and is used for installing the opening of valve cover, is provided with the bypass connection pipe for intercommunication bypass on the valve cover, the valve cover with the valve body is detachable connection at the opening, after the valve cover is removed from the valve body, the bypass connection pipe is removed with the valve cover, and the bypass switch subassembly and the valve core can be taken out from the opening. The utility model solves the current pump protection valve and can not realize on -line maintenance, and every time maintenance has to remove the whole pump protection valve from the pipeline first, then its disassembly maintenance, increases the maintenance man -hour and the technical problem of technology, has the technical effect that can on -line maintenance, especially suitable for using in the circulating water system of compressed air energy storage system, and the maintenance and repair operation time of system is greatly shortened.

Description

Technical Field

[0001] This utility model relates to the field of pump protection valve technology, and in particular to a pump protection valve. Background Technology

[0002] Pumps are used to provide the necessary pressure and flow rate to water systems. One of the parameters of a pump is its minimum flow rate. However, when the unit starts up or the load is low, the water flow rate inside the pump casing is extremely small. Almost all the work done by the impeller inside the pump is converted into heat energy, causing the water temperature inside the pump casing to rise continuously. As the water temperature inside the pump casing rises, the water is more prone to vaporization, thus causing cavitation and damaging the pump's performance and lifespan. One way to prevent this phenomenon is to install a pump protection valve at the pump outlet.

[0003] In the process of developing this utility model, the inventors discovered at least the following problems in the prior art: due to the complex internal structure of the pump protection valve and the variety of transported media, the pump protection valve is prone to blockage or damage, requiring regular inspection and maintenance. However, existing pump protection valves cannot be inspected and maintained online. Each time maintenance is required, the entire pump protection valve must be removed from the pipeline and disassembled for repair, increasing maintenance time and process complexity.

[0004] Therefore, how to provide a pump protection valve that allows for disassembly of the internal structure of the valve body without removing it from the pipeline is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The main problem this invention addresses is providing a pump protection valve that enables online maintenance.

[0006] To achieve this objective, a pump protection valve is provided. The valve body has an inlet communicating with the pump, an outlet communicating with the main pipeline, and an opening for installing a valve cover. The valve cover has a bypass connector for communicating with a bypass. The valve cover and the valve body are detachably connected at the opening. One end of a bypass switch assembly for switching the bypass is fitted inside the bypass connector, and the other end of the bypass switch assembly is connected to the valve core. After the valve cover is removed from the valve body, the bypass connector is removed along with the valve cover, and the bypass switch assembly and the valve core can be taken out from the opening.

[0007] Furthermore, a valve seat is provided inside the valve body, and the valve core is disposed on the valve seat in a sealable manner. Below the valve seat is a cavity for fluid flow.

[0008] Furthermore, the bypass switch assembly includes a sliding sleeve, which is a column that matches the shape of the inner cavity of the bypass connector. The sliding sleeve can adjust the flow rate in the bypass by moving along the bypass connector.

[0009] Furthermore, the bypass pipe sidewall is provided with a first flow hole and a second flow hole, the first flow hole is located above the partition plate and the second flow hole is located below the partition plate, and the valve cover inner sidewall is provided with a bypass flow channel that communicates with both the first flow hole and the second flow hole.

[0010] Furthermore, a partition plate is provided inside the bypass pipe, and a third flow hole is provided at the top of the sliding sleeve. The partition plate is used to close the third flow hole.

[0011] Furthermore, the bottom of the valve core is provided with a fourth flow hole that communicates with the third flow hole.

[0012] Furthermore, the bypass switch assembly includes at least one pressure reducing element.

[0013] Furthermore, the bypass switch assembly includes a sliding sleeve, and a pressure reducing element is detachably disposed within the sliding sleeve.

[0014] Furthermore, the pressure-reducing component is a pressure-reducing plate containing at least one pressure-reducing hole.

[0015] On the other hand, a pump protection valve is provided, including a valve body, on which an inlet communicating with a pump, an outlet communicating with a main line, and a bypass pipe for communicating with a bypass are provided; the upper end of a bypass switch assembly for switching the bypass is sleeved in the bypass pipe, and the lower end of the bypass switch assembly is slidably connected to the valve core.

[0016] Furthermore, the bypass switch assembly includes a sliding sleeve, and the valve core is provided with a sliding groove that slides and engages with the lower part of the sliding sleeve, and the lower part of the sliding sleeve can slide along the groove wall within the groove.

[0017] Furthermore, a pre-compressed elastic element is provided inside the sliding sleeve, and the elastic element abuts between the sliding sleeve and the valve core.

[0018] One of the above technical solutions has the following advantages or beneficial effects: the valve cover and valve body are detachably connected at the opening. After removing the valve cover, the bypass pipe on the valve cover is also removed, and the bypass switch assembly and valve core can be taken out from the opening of the valve body. Therefore, when removing the valve core and bypass switch assembly, only the valve cover needs to be removed from the valve body; there is no need to disconnect the valve inlet and outlet from the main pipeline. Maintenance of the pump protection valve can be performed without removing the valve body from the pipeline, achieving the technical effect of online maintenance.

[0019] Another technical solution in the above-mentioned technical solution has the following advantages or beneficial effects: after the bypass is completely closed and the main line is fully opened, the valve core can still continue to slide upward under the drive of the main line fluid, thereby increasing the flow rate of the main line and reducing the external size of the pump protection valve. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the pump protection valve in this embodiment when the main line is closed and the bypass is open; Figure 2 This is a schematic diagram of the internal structure of the pump protection valve in this embodiment with the main circuit open and the bypass circuit closed. Figure 3 This is a schematic diagram of the internal structure of the pump protection valve in the embodiment with the main line open and the bypass closed. Figure 4 This is a schematic diagram of the internal structure of the pump protection valve body in an embodiment; Figure 5 This is a schematic diagram of the main circuit and bypass linkage switch inside the pump protection valve in an embodiment. Figure 6 This is a schematic diagram of the structure after the inner valve cover and bypass pipe of the pump protection valve are connected in the embodiment; Figure 7 This is a schematic diagram of the structure of the pump protection valve after the valve core and sliding sleeve structure are connected in the embodiment. Figure 8 This is a schematic diagram of the pressure-reducing plate provided in the embodiment; Figure 9 This is a schematic diagram of the pump protection valve disassembly method in an embodiment; Figure 10 This is another pump protection valve provided in the embodiment; Figure 11 This is a schematic diagram of the disassembly and assembly of the pump protection valve when adjusting the pressure reduction level in the embodiment.

[0021] In the diagram: 1-Valve body; 11-Valve seat; 12-Inlet; 13-Opening; 14-Outlet; 2-Valve core; 21-Boss; 22-Slide groove; 23-Fourth flow hole; 24-Spring seat; 3-Valve cover; 31-Fixed flange; 32-Positioning groove; 4-Bypass pipe; 41-Lower fixed flange; 42-Upper fixed flange; 43-Partition plate; 44-First flow hole; 45-Second flow hole; 5-Plunger; 6-Pressure reducing plate; 61-Pressure reducing hole; 62-Support part; 7-Elastic element; 8-Slide sleeve; 81-Third flow hole; 82-Plunger groove; 83-Stop flange; 15, 16, 91, 92-Sealing components; 9-Cover plate. Detailed Implementation

[0022] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] Example 1: like Figures 1-11 In this embodiment, the pump protection valve is connected to the pump's outlet pipeline. The pump protection valve's interfaces include an inlet 12 connected to the pump outlet, a main outlet 14 connected to the main process circulation pipeline, and a bypass connector connected to the bypass. The flow path between the pump protection valve's inlet and outlet is the valve's main path, which is connected to the process circulation system pipeline where the pump is located. The flow path between the pump protection valve's inlet and the bypass connector is the valve's bypass, which is connected to a bypass tank outside the valve. The inlet of the bypass tank is connected to the bypass outlet of the pump protection valve via a pipeline, and the outlet of the bypass tank is connected to the pump's inlet via a pipeline. When the flow rate on the main process circulation pipeline decreases below the pump's minimum flow rate, the pump protection valve's main path begins to close, and the bypass begins to open. The bypass circulation ensures sufficient fluid medium enters the pump's inlet, thereby ensuring the pump's total flow rate is greater than the required minimum flow rate and maintaining stable pump operating conditions. When the flow rate on the main process circulation pipeline increases to above the pump's minimum flow rate, the pump protection valve's bypass completely closes, and the pump connects to the main path, providing pressure and flow to the main path.

[0024] like Figures 1-4 As shown, the pump protection valve includes a valve body 1. Valve body 1 can be a straight-through type, an angle type, or a straight-through direct-flow type. The form of the valve body can be designed according to the spatial position of the valve on the pipeline. In this example, the valve body 1 shown in the attached diagram is a straight-through type, where the inlet and outlet of the straight-through valve body are on a straight line. For example, the inlet 12 of valve body 1 is connected to the pump outlet, and the outlet 14 of valve body 1 is connected to the main pipeline. The inlet 12 and outlet 14 of valve body 1 can also be arranged perpendicularly. Valve body 1 is provided with an inlet 12 connected to the pump and an outlet 14 connected to the main pipeline.

[0025] like Figures 1-11 The valve body 1 is also provided with an opening 13 for installing the valve cover. The opening 13 is located between the inlet 12 and the outlet 14, and the valve cover 3 is detachably connected to the valve body 1 at the opening 13. Figures 4-6As shown, a fixing flange 31 is provided on the upper side of the valve cover 3. The valve cover 3 is fixedly connected to the valve body 1 by fasteners commonly used in the valve industry (not shown in the figure) passing through the fixing through hole on the fixing flange 31. A sealing component 16 is provided between the valve cover 3 and the valve body 1. Optionally, a positioning platform that mates with the valve cover 3 is provided at the opening of the opening 13 of the valve body 1, and the sealing component 16 is located on the positioning platform.

[0026] like Figures 5-6 The valve cover 3 is provided with a bypass connector 4 for connecting to a bypass. The valve cover 3 has a cavity for housing the bypass connector 4, which is located within the cavity of the valve cover 3 and fixedly connected to the valve cover 3. Optionally, the valve cover 3 has a positioning groove 32 at the position where it mates with the bypass connector 4, for positioning the lower fixing flange 41 of the bypass connector 4, and the lower fixing flange 41 of the bypass connector 4 is fixedly connected to the valve cover 3 by fasteners. The upper part of the bypass connector 4 is also provided with an upper fixing flange 42 for connecting to an external bypass circulation, and the bypass pipeline is connected to the bypass connector 4 through the fixing flange 42. After the valve cover 3 is removed from the valve body 1, the bypass connector 4 is removed along with the valve cover 3.

[0027] like Figures 4-7 One end of the bypass switch assembly is fitted inside the bypass pipe. The bypass switch assembly moves within the bypass pipe to open or close the flow channel on the bypass pipe. After the valve cover 3 is removed from the valve body 1, the bypass pipe 4 is removed along with the valve cover 3, and the bypass switch assembly used to switch the bypass is detached from the bypass pipe 4.

[0028] like Figures 4-7 As shown, a valve seat 11 and a valve core 2 are disposed within the cavity of the valve body 1. The valve core 2 is disposed on the valve seat 1 in a sealable manner. The valve core 2 cooperates with the valve seat 11 to open and close the main circuit. When the valve core 2 is pressed against the valve seat 11, the main circuit is closed; when the valve core 2 is removed from the valve seat 11, the main circuit gradually opens. A sealing component 15 is provided at the point where the valve core 2 and the valve seat 11 mate. Optionally, the valve core 2 is an inverted conical body, and the upper edge of the valve core has an annular boss 21 that mates with the valve seat 11. The valve core 2 is pressed against the valve seat 11 through the boss 21, and the sealing component 15 is disposed between the boss of the valve core and the valve seat 11. The sealing component can be a commonly used seal for valves.

[0029] like Figures 4-7Under normal operating conditions, the lower end of the bypass switch assembly is connected to the valve core 2. The connection between the bypass switch assembly and the valve core enables the linkage between the main circuit and the bypass. When the flow rate at inlet 12 increases, the valve core 2 is pushed upwards by the main circuit flow to move away from the valve seat 11. At this time, the main circuit is gradually opened. The lower end of the bypass switch assembly is connected to the valve core 2, and the upward movement of the valve core 2 causes the bypass switch assembly to move upwards. The bypass switch assembly, fitted inside the bypass pipe 4, gradually closes the bypass. When the flow rate at inlet 12 begins to decrease, the valve core 2, driven by the bypass switch assembly and its own gravity, approaches the valve seat 11 and gradually closes the main circuit. The valve core 2 then causes the bypass switch assembly to move downwards, gradually opening the bypass and forming a bypass circulation for pump protection.

[0030] The disassembly process of the pump protection valve in this embodiment is as follows: Since the valve cover and valve body are detachably connected at the opening, and the valve cover is provided with a bypass pipe for connecting the bypass, after the valve cover 3 is removed from the valve body 1, the bypass pipe 4 is removed along with the valve cover 3. At this time, the bypass switch assembly for switching the bypass is detached from the bypass pipe 4, and the bypass switch assembly and valve core are taken out from the opening on the valve body. The installation process is as follows: The bypass switch assembly and valve core can be assembled, or the valve core can be first inserted into the valve body through the opening on the valve body and placed on the valve seat, and then the bypass switch assembly and valve core can be assembled. After the bypass switch assembly and valve core are installed, the lower part of the bypass pipe is fitted onto the bypass switch assembly. At this time, the valve cover 3 is also installed in place, and the valve cover 3 is fixedly connected to the valve body 1 by bolts. Therefore, when the pump protection valve of this embodiment needs maintenance, it is not necessary to remove the valve body of the pump protection valve from the pipeline. Only the valve cover needs to be removed from the valve body, and all the internal parts of the valve can be taken out for maintenance or cleaning. It can be disassembled and assembled online, thus having the technical effect of online inspection and maintenance.

[0031] Furthermore, in this embodiment of the pump protection valve, since the bypass and bypass switch components are both located on the upper part of the valve seat, it not only facilitates online maintenance but also has the advantage of low fluid resistance in the main path. For most pump protection valves, the main path represents the flow rate required by the process within the system. Existing pump protection valves typically have a main-path bypass linkage mechanism that runs through the main path, occupying part of the main path's flow channel area and resulting in high flow resistance of the medium in the main path. In this embodiment of the pump protection valve, since the bypass and bypass switch components are both located on the upper part of the valve seat, compared to existing technologies, not only are the components for linkage switching the main and bypass paths more compact within the valve body, but also, because the main path portion at the lower part of the valve seat has no structure, when the main path flow rate increases, the fluid flow resistance in the main path from inlet to outlet is very small, resulting in minimal pressure loss. For most pump protection valves, the main path represents the flow rate required by the process system; therefore, low pressure loss in the main path reduces pump power, thereby improving the efficiency of the process system where the main path is located.

[0032] Furthermore, the maximum size of valve core 2 is represented by the side length of the largest circumscribed cube in any direction. In this embodiment, valve core 2 is a cone with a circular cross-section, i.e., a "frustum of a cone" with a straight generatrix. Therefore, the uppermost circular surface of valve core 2 is the maximum size of valve core 2. In this embodiment, the maximum size of valve core 2 is smaller than the inner diameter of opening 13 on valve body 1. During assembly, valve core 2 can be hoisted into valve body through valve body opening and pressed onto valve seat without needing to adjust the position of valve core within valve body.

[0033] like Figures 1-7 As shown, the valve cover 3 and the bypass connector 4 have fluid channels for connecting the valve inlet and the bypass. The upper end of the bypass switch assembly for switching the bypass is fitted inside the bypass connector. The bypass fluid channel is opened or closed by moving the bypass switch assembly within the assembly formed by the valve cover 3 and the bypass connector 4. Specifically, a bypass flow channel 33 is provided on the inner side wall of the valve cover 3. The bypass flow channel is an annular groove. The side wall of the bypass connector 4 is provided with flow holes. When the bypass connector 4 is fixed to the valve cover 3, the bypass flow channel 33 of the valve cover 3 can communicate with all the flow holes on the bypass connector 4.

[0034] like Figures 6-7 As shown, further, a partition plate 43 is provided inside the central hole of the bypass connector 4. The partition plate 43 has a plate-like structure, and the shape of its outer contour matches the shape of the inner contour of the central hole of the bypass connector 4. The outer edge of the partition plate 43 is fixed to the inner wall of the central hole of the bypass connector 4, and the partition plate 43 is used to block the bypass connector 4. Further, the partition plate 43 is welded to the inner wall of the central hole of the bypass connector 4. When the bypass switch assembly contacts the partition plate 43, the fluid passage formed by the valve cover 3 and the bypass connector 4 is blocked.

[0035] like Figures 6-7 As shown, further, the flow holes on the side wall of the bypass connector 4 include a first flow hole 44 and a second flow hole 45 located above and below the partition plate 43, respectively. The fluid medium in the valve body 1 can enter the bypass channel 33 of the valve cover 3 from the first flow hole of the bypass connector 4, and then return to the central hole of the bypass connector 4 from the bypass channel 33 of the valve cover 3 via the second flow hole. Optionally, the first flow hole 44 is located above the partition plate 43, and the second flow hole 45 is located below the partition plate 43. Further, the diameter of the second flow hole 45 is smaller than the diameter of the first flow hole 44, making the throttling effect of the second flow hole 45 better than that of the first flow hole 44.

[0036] like Figures 5-7The bypass switch assembly 8 includes a sliding sleeve 8. After the pump protection valve is assembled, the sliding sleeve 8 is nested within the central hole of the bypass pipe 4, located below the partition plate 43. The sliding sleeve 8 is a cylindrical body with closed side walls. When the top of the sliding sleeve 8 contacts the partition plate 43 of the bypass pipe 4, the side of the sliding sleeve 8 blocks the flow hole located below the partition plate on the side wall of the bypass pipe 4. Optionally, when the top of the sliding sleeve 8 contacts the partition plate 43 of the bypass pipe 4, the side of the sliding sleeve 8 blocks the second flow hole 45 on the side wall of the bypass pipe 4.

[0037] like Figures 5-7 The sliding sleeve 8 is a hollow cylindrical body with a third flow hole 81 at its top. When there is a gap between the top of the sliding sleeve 8 and the partition plate 43 of the bypass pipe 4 that allows the fluid medium to pass through, the fluid medium can enter the second flow hole 45 on the side wall of the bypass pipe 4, the bypass flow channel 33 of the valve cover 3, and the first flow hole 44 on the side wall of the bypass pipe 4 through the third flow hole 81.

[0038] like Figures 5-7 A cylindrical plunger 5 is provided on the side of the partition plate 43 near the third flow hole 81. The plunger 5 is positioned close to the sliding sleeve 8 and is used to block and seal the third flow hole 81 at the top of the sliding sleeve 8. The diameter of the plunger 5 is larger than the diameter of the third flow hole 81 to ensure that the bypass can be completely closed. The top of the sliding sleeve 8 is also provided with a plunger groove 82 that mates with the plunger 5. The third flow hole 81 is located at the bottom of the plunger groove 82. The internal dimensions of the plunger groove 82 are slightly larger than the external dimensions of the plunger 5, so that when the sliding sleeve 8 is close to the partition plate 43, the top of the plunger 5 is located inside the plunger groove 82 and fits tightly against the plunger groove 82, allowing the plunger 5 to seal the third flow hole 81. When the plunger contacts the plunger groove, the fluid medium cannot pass through the third flow hole.

[0039] like Figures 5-7 The lower part of the sliding sleeve 8 is located inside the valve core 2. The bottom of the valve core 2 is provided with a fourth flow hole 23, through which the fluid medium can pass. The fluid medium in the valve body 1 can enter the third flow hole 81 through the fourth flow hole 23. When there is a gap between the plunger 5 and the sliding sleeve 8, the fluid then enters the second flow hole 45 on the side wall of the bypass pipe 4, the bypass flow channel 33 of the valve cover 3, and the first flow hole 44 on the side wall of the bypass pipe 4. Further, a stop flange 83 is provided on the lower side of the sliding sleeve 8. A cover plate 9 is provided at the groove of the valve core 2 and is fixedly connected to the valve core 2. The cover plate 9 has an inner hole that matches the outer diameter of the sliding sleeve 8. The cover plate 9 is used to block the stop flange 83 in the sliding groove 22. A sealing component 92 is provided between the inner wall of the cover plate 9 and the outer wall of the sliding sleeve 8. A sealing component 91 is provided on the contact surface between the cover plate 9 and the valve core 2. The valve core 2 has a receiving groove at the position where the cover plate is connected to, which is used to accommodate the cover plate 9, making it easy to position and place the cover plate 9.

[0040] like Figures 5-7In this embodiment, the pump protection valve controls the opening and closing of the bypass by sliding the sleeve 8 within the bypass connector 4. As the main flow gradually increases, the fluid medium flow rate at the valve body inlet increases, the dynamic pressure of the fluid medium rises, and the valve core 2 within the valve body is pushed away from the valve seat by the fluid medium. At this time, the valve core 2 drives the sleeve 8 to slide within the bypass connector 4, and the side wall of the sleeve 8 blocks the flow hole on the side wall of the bypass connector 4, thereby reducing the bypass flow rate. When the plunger groove 82 at the top of the sleeve 8 contacts the plunger 5, the bypass is closed. At this time, the flow rate of the main flow is the flow rate required by the main flow process system.

[0041] In this embodiment, the pump protection valve ensures that the pump flow rate is always greater than the minimum flow rate. When the inlet flow rate is low, the bypass is opened by the valve core, and the bypass pipe connects to an external water tank. If the inlet of the pump protection valve is a high-pressure fluid medium, the high-pressure cutoff will cause all of it to enter the bypass pipe of the pump protection valve, and thus into the water tank. This could cause overpressure rupture in the water tank inlet pipeline, leading to safety problems such as cavitation and vibration in the bypass of the pump protection valve and its bypass pipeline. Therefore, the bypass of the pump protection valve in this embodiment is equipped with a pressure reducing device to ensure that the fluid at the outlet of the bypass pipe is always in a low-pressure state.

[0042] Optionally, the pressure-reducing component is a pressure-reducing plate with a narrow pressure-reducing orifice. When the fluid medium passes through the narrow pressure-reducing orifice of the pressure-reducing plate, the flow velocity increases sharply, and the static pressure energy of the fluid is converted into kinetic energy, resulting in a decrease in the flow pressure, thereby meeting the low-pressure requirement of the bypass circulation. The pressure-reducing plate 6 can be disposed within the bypass pipe 4, or it can be disposed within the bypass switch assembly. Optionally, in this embodiment, the pressure-reducing component is disposed inside the bypass switch assembly, and the pressure-reducing plate 6 is located within the central hole of the sliding sleeve 8.

[0043] The pressure reducing plate 6 can be fixedly connected inside the sliding sleeve 8; optionally, the pressure reducing component and the bypass switch assembly can be detachably connected. Figures 7-8 The overall diameter of the pressure reducing plate 6 is slightly smaller than the inner diameter of the central hole of the sliding sleeve 8, and the pressure reducing plate 6 and the central hole of the sliding sleeve 8 are clearance-fitted.

[0044] Optionally, the pressure-reducing plate 6 is located at the third flow hole of the sliding sleeve 8. The pressure-reducing plate 6 can be snapped into the third flow hole. A pre-compressed elastic element is provided between the pressure-reducing element and the valve core, with one end of the pre-compressed elastic element abutting against the side of the pressure-reducing element away from the third flow hole, and the other end abutting against the inside of the valve core. Figures 5-8 Preferably, the pressure-reducing plate is pressed against the third flow hole by a pre-compressed elastic element. Alternatively, the pre-compressed elastic element can be a spring, with a spring seat 24 at the bottom of the valve core 2 for limiting the position of the spring.

[0045] Optionally, the pressure reducing plate 6 has at least two pressure reducing holes 61. The pressure reducing holes 61 on the pressure reducing plate 6 are arranged in a ring array. Furthermore, the diameter of the inscribed circle of all pressure reducing holes matches the diameter of the third flow hole, and the two are approximately the same size. One of the specifications of the pressure reducing plate 6 is the arrangement, number, and size of the pressure reducing holes 61.

[0046] like Figure 8 Furthermore, in order to prevent the pressure relief hole 61 on the pressure relief plate 6 from being blocked, a support part 62 is provided on the outer periphery of the pressure relief plate 6, which is approximately perpendicular to the plate surface. The end face of the support part abuts against the inner top wall of the sliding sleeve 8. The support part is used to create a cavity between the pressure relief plate 6 and the third flow hole for the fluid medium to flow through.

[0047] Furthermore, there are two or more pressure-reducing components, and the pressure reduction level of the fluid in the bypass is adjusted by changing the number of pressure-reducing components. For example... Figures 10-11 As shown, there are two or more pressure-reducing plates 6, which are stacked and arranged inside the central hole of the sliding sleeve 8. Optionally, support portions 62 are provided on both the upper and lower sides of the pressure-reducing plates 6, so that the pressure-reducing holes on the pressure-reducing plates are not blocked by adjacent structures after two or more pressure-reducing plates 6 are stacked. The two or more pressure-reducing plates 6 are pressed against the third flow hole of the sliding sleeve 8 by pre-compressed elastic elements 7. Therefore, in the pump protection valve of this embodiment, the pressure reduction level in the bypass can be adjusted by adjusting the number and specifications of the pressure-reducing plates 6. Increasing the number of pressure-reducing plates 6 stacked inside the sliding sleeve 8 increases the pressure reduction level of the bypass, and conversely, decreasing the number of pressure-reducing plates 6 decreases the pressure reduction level of the bypass.

[0048] As described above, the pump protection valve of this embodiment allows for online removal of the bypass switch assembly. Furthermore, after removing the bypass switch assembly, the bypass pressure reduction level can be adjusted online by adjusting the number of pressure-reducing components within the bypass switch assembly. This eliminates the need to remove the entire valve body from the pipeline. When adjusting the bypass pressure reduction level, simply remove the valve cover 3 and then take out the sliding sleeve. Figures 1-11 When it is necessary to adjust the bypass pressure reduction level, after removing the valve cover 3, take out the sliding sleeve and valve core together, and then remove the cover plate 9. Then, you can add or remove pressure reducing plates in the sliding sleeve 8 to adjust the bypass pressure reduction level.

[0049] In this embodiment, the areas of the fourth flow hole 23, the third flow hole 81, the second flow hole 45, and the first flow hole 44 in the bypass circulation of the pump protection valve, as well as the dimensions of the bypass flow channel 33 in the valve cover 3, can all be designed according to the minimum flow rate required by the pump. The dimensions and shape of the valve core 2 are designed based on a comprehensive consideration of the main circulation flow rate and the bypass circulation flow rate. Regardless of the opening degree of the main and bypass channels, the sum of the main circulation flow rate and the bypass circulation flow rate is always greater than the pump's minimum flow rate, thus achieving the purpose of pump protection.

[0050] Example 2: This embodiment provides a pump protection valve, and the parts that are the same as in embodiment one will not be described again.

[0051] Existing pump protection valves, due to the complex structure of their internal linkage main circuit and bypass circuit, may have their rated flow rate of the main circuit limited, necessitating an increase in the external dimensions of the pump protection valve; otherwise, the main circuit may not be able to meet the requirements of the process system in which it is located.

[0052] like Figures 5-7 In this embodiment of the pump protection valve, the sliding sleeve 8 can slide within the valve core 2. Since the lower part of the sliding sleeve 8 can slide within the valve core 2, even after the bypass is completely closed and the main line is fully opened, the valve core 2 can still continue to slide along the sliding sleeve 8 under the drive of the main line fluid, thereby increasing the flow rate of the main line. This allows the pump protection valve to achieve higher rated flow and pressure parameters required by the process, reduces the external size of the pump protection valve, and provides more wrench space during disassembly.

[0053] like Figures 5-7 Furthermore, the valve core 2 is provided with a sliding groove 22 that slidably connects with the lower part of the sliding sleeve 8, allowing the lower part of the sliding sleeve 8 to slide along the groove wall within the valve core 2. A stop flange 83 is provided on the lower side of the sliding sleeve 8. A cover plate 9, fixedly connected to the valve core 2, is provided at the opening of the sliding groove of the valve core 2. The cover plate 9 has an inner hole matching the outer diameter of the sliding sleeve 8, and is used to retain the stop flange 83 within the sliding groove 22. A sealing component 92 is provided between the inner wall of the cover plate 9 and the outer wall of the sliding sleeve 8, and a sealing component 91 is provided on the contact surface between the cover plate 9 and the valve core 2. A receiving groove is provided at the position where the cover plate connects to the valve core 2 to accommodate the cover plate 9, facilitating the positioning and placement of the cover plate 9.

[0054] like Figures 5-7 Furthermore, a pre-compressed elastic element 7 is provided inside the sliding sleeve 8. The size of the elastic element 7 is larger than the size of the third flow hole 81. One end of the pre-compressed elastic element 7 abuts against the inner top wall of the sliding sleeve 8, and the other end abuts against the bottom of the valve core 2. A spring seat 24 for positioning the spring is provided at the bottom of the valve core 2. The size of the spring seat 24 is larger than the size of the fourth flow hole. The pre-compressed elastic element 7 has a certain pre-compression force. When the external pressure of the valve core 2 is greater than the clamping force of the elastic element 7, the valve core 2 can slide upward along the sliding sleeve 8. When the external pressure of the valve core 2 is less than the clamping force of the elastic element 7, there is no relative sliding between the valve core 2 and the sliding sleeve 8, which avoids the valve core 2 moving upward under the action of unstable instantaneous flow, so that the outlet flow of the valve core 2 increases steadily. Therefore, when the main inlet flow of the pump protection valve increases rapidly, the flow of the main outlet of the valve body increases gradually under the action of the elastic element 7, which improves the safety and stability of the pump protection valve.

[0055] Optionally, a pre-compressed helical spring is used as the elastic element. In this embodiment of the pump protection valve, as the inlet flow rate of the valve body 2 increases, the valve core 2 pushes the sliding sleeve 8 upward under the action of fluid pressure. When the plunger groove 82 on the sliding sleeve 8 is in contact with the plunger 5, the bypass flow rate of the pump protection valve is zero. As the inlet flow rate of the valve body further increases, the valve core 2 rises steadily again along the sliding sleeve 8 under the action of the pre-compressed spring, further increasing the flow rate at the main outlet.

[0056] Figure 1 This is a schematic diagram of the internal structure of the pump protection valve in this embodiment when the main line is completely closed and the bypass is completely open. Figure 2 This is a schematic diagram of the internal structure of the pump protection valve in this embodiment when the main circuit is open and the bypass circuit is closed. Figure 3 This is a schematic diagram of the internal structure of the pump protection valve in this embodiment when the main line is fully open and the bypass is fully closed. From Figures 1 to 3 This illustrates the process of the main road changing from completely closed to completely open, and the bypass changing from completely open to closed. For example... Figures 1-3 In this embodiment, the pump protection valve is connected to the pump outlet, and the flow rate of the main circuit of the pump protection valve is the process flow rate required by the circulating water system. The main circuit and the bypass circuit are linked by the above-mentioned structure inside the valve to achieve automatic opening of the bypass circuit when the main circuit is closed and automatic closing of the bypass circuit when the main circuit is open. The above switching process is driven by the flow rate at the inlet of the pump protection valve. Because the pump protection valve has the above-mentioned structure, the sum of the flow rates of the main circuit and the bypass circuit can always be greater than the minimum flow rate of the water pump, so that the pump can operate normally.

[0057] Specifically, in this embodiment, the automatic switching process between the main circuit and the bypass circuit of the pump protection valve is as follows: As the main flow rate of the pump protection valve gradually decreases, the valve core 2 gradually approaches the valve seat 11. Due to the decrease in the main flow rate, the bypass flow rate gradually increases. When the inlet flow rate of the pump protection valve is less than the minimum flow rate of the pump, the main flow is completely closed when the valve core 2 is pressed on the valve seat. The valve core 2 drives the sliding sleeve 8 to slide down, making the bypass fully open. The pressurized fluid entering from the inlet of the pump protection valve enters the sliding sleeve 8 through the fourth flow hole 23 of the valve core 2. After being depressurized step by step by the pressure reducing plate 6, it flows into the third flow hole 81 at the top of the sliding sleeve 8. After flowing out of the third flow hole, it enters the second flow hole 45 of the bypass pipe 4. After flowing out of the second flow hole 45, it enters the bypass flow channel 33 of the valve cover 3. After flowing out of the bypass flow channel 33, it enters the first flow hole 44. After flowing out of the first flow hole 44, it enters the bypass pipe and then enters the bypass circulation outside the pump protection valve through the bypass pipe.

[0058] As the main flow rate in the pump protection valve gradually increases, the fluid pressure at valve core 2 increases. Under the action of fluid pressure, valve core 2 disengages from valve seat 11, causing valve core 2 to drive the sliding sleeve 8 to rise. As the sliding sleeve 8 rises within the bypass connector 4, it gradually closes the second flow hole 45 on the lower side of the bypass connector 4, thereby reducing the bypass flow rate. As the inlet flow rate of the pump protection valve further increases, valve core 2 continues to drive the sliding sleeve 8 to rise. As the sliding sleeve 8 rises until its plunger groove 82 engages with the plunger 5, the third flow hole 81 at the top of the sliding sleeve 8 is closed by the plunger 5, and the second flow hole 45 of the bypass connector 4 is completely closed. At this time, the bypass flow rate of the pump protection valve is zero, and all fluid flows out from the main outlet 14. As the inlet flow rate of the pump protection valve increases again, when the external pressure of valve core 2 exceeds the elastic force of the elastic element inside the sliding sleeve 8, valve core 2 rises again along the sliding sleeve 8, further increasing the main flow rate.

[0059] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pump protection valve, characterized in that, The valve body is provided with an inlet connected to the pump, an outlet connected to the main line, and an opening for installing a valve cover. The valve cover is provided with a bypass pipe for connecting to a bypass. The valve cover and the valve body are detachably connected at the opening. One end of the bypass switch assembly for switching the bypass is fitted inside the bypass pipe, and the other end of the bypass switch assembly is connected to the valve core. After the valve cover is removed from the valve body, the bypass connector is removed along with the valve cover, and the bypass switch assembly and the valve core can be taken out from the opening.

2. The pump protection valve according to claim 1, characterized in that, The valve body is provided with a valve seat, the valve core is disposed on the valve seat in a sealable manner, and the lower part of the valve seat is a cavity for fluid flow.

3. The pump protection valve according to claim 1, characterized in that, The bypass switch assembly includes a sliding sleeve, which is a column that matches the shape of the inner cavity of the bypass connector. The sliding sleeve can adjust the flow rate in the bypass by moving along the bypass connector.

4. The pump protection valve according to claim 3, characterized in that, The bypass pipe sidewall is provided with a first flow hole and a second flow hole. The first flow hole is located above the partition plate, and the second flow hole is located below the partition plate. The inner sidewall of the valve cover is provided with a bypass flow channel that communicates with both the first and second flow holes.

5. The pump protection valve according to claim 3, characterized in that, A partition plate is provided inside the bypass pipe, and a third flow hole is provided at the top of the sliding sleeve. The partition plate is used to close the third flow hole.

6. The pump protection valve according to claim 5, characterized in that, The valve core has a fourth flow hole at its bottom that communicates with the third flow hole.

7. The pump protection valve according to claim 1, characterized in that, The bypass switch assembly includes at least one pressure reducing element.

8. The pump protection valve according to claim 7, characterized in that, The bypass switch assembly includes a sliding sleeve, and the pressure reducing element is detachably disposed within the sliding sleeve.

9. The pump protection valve according to claim 7, characterized in that, The pressure-reducing component is a pressure-reducing plate containing at least one pressure-reducing hole.

10. A pump protection valve, characterized in that, Includes a valve body, which is provided with an inlet connected to the pump, an outlet connected to the main pipeline, and a bypass pipe for connecting to a bypass. The upper end of the bypass switch assembly for switching the bypass is fitted inside the bypass pipe, and the lower end of the bypass switch assembly is slidably connected to the valve core.

11. The pump protection valve according to claim 10, characterized in that, The bypass switch assembly includes a sliding sleeve, and the valve core is provided with a sliding groove that slides and engages with the lower part of the sliding sleeve. The lower part of the sliding sleeve can slide along the groove wall within the groove.

12. The pump protection valve according to claim 11, characterized in that, A pre-compressed elastic element is provided inside the sliding sleeve, and the elastic element abuts between the sliding sleeve and the valve core.

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