A multi-stage partition liquid variable-volume plug pump based on permanent magnet motor and a measuring and controlling device

Abstract

The application discloses a multi-stage partition liquid variable-volume type plug body pump based on a permanent magnet motor and a measuring and controlling device, and belongs to the pump body field. The multi-stage partition liquid variable-volume type plug body pump based on the permanent magnet motor comprises a pump base and a top block which are connected with each other, bottom piston support pieces, a plurality of middle multi-stage partition plugs and top piston support pieces are arranged between the pump base and the top block, multi-stage installation housings are connected between adjacent bottom piston support pieces, the plurality of middle multi-stage partition plugs and the top piston support pieces, flexible sealing pieces are arranged in partition installation grooves, and a permanent magnet output motor is arranged at the top of the pump base. The application can improve the overall sealing effect, can guarantee stable conveying, can avoid liquid leakage or flow mixing, can reduce the abrasion of components in the pump, can improve the service life of equipment, can guarantee the actual pressurizing capacity of the pump, and can meet the demand of working conditions on liquid conveying pressure and flow.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and in particular to a multi-stage partitioned variable displacement plug pump based on a permanent magnet motor and a measurement and control device thereof. Background Technology

[0002] Most existing high-rise buildings use a tiered pressurized water supply system for their secondary water supply systems. This type of system requires multiple sets of power transmission equipment—pump-water supply combination units—within the pump room. This increased number of units presents two problems: First, it increases the area of ​​the pump room, which may be insufficient for some older residential areas with limited land. Second, using multiple pressurized pump combinations leads to a corresponding increase in energy consumption, resulting in high energy consumption. Therefore, zoning is typically used in these systems. This operation is accomplished by a multi-stage booster pump. Since the multi-stage booster pump achieves pressure increase by sequentially performing work on water through multiple stages, it requires extremely strong sealing performance. The core function of the pump is to achieve liquid transportation by gradually pressurizing through multiple stages. Poor sealing performance will lead to pressure leakage between stages, resulting in a significant decrease in the actual pressurization capacity of the pump, insufficient outlet flow, and insufficient head, which cannot meet the working conditions' requirements for liquid transportation pressure and flow. Secondly, seal failure will lead to liquid leakage or cross-flow, which will cause the impeller, plug and other components inside the pump to wear more quickly due to insufficient liquid lubrication and cooling, and may even cause cavitation, shortening the service life of the equipment. In view of this, this invention is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art, and to propose a multi-stage partitioned liquid variable displacement plug pump and a measurement and control device based on a permanent magnet motor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multi-stage partitioned liquid variable displacement plug pump based on a permanent magnet motor includes a pump base and a top block connected to each other. A bottom piston support, multiple middle multi-stage partitioned plugs and a top piston support are provided between the pump base and the top block. A multi-stage mounting housing is connected between adjacent bottom piston supports, multiple middle multi-stage partitioned plugs and top piston supports.

[0006] The bottom piston support is provided with partition mounting grooves at the top, the upper and lower ends of the multiple middle multi-stage partition plugs, and the bottom of the top piston support. Flexible sealing elements are provided in the partition mounting grooves, and the two ends of the multiple multi-stage mounting shells are respectively inserted into different partition mounting grooves.

[0007] The top piston support is connected to a top arc-shaped outer shell, and the top block abuts against the top outer wall of the top arc-shaped outer shell;

[0008] The pump base is equipped with a permanent magnet output motor at its top.

[0009] Preferably, the bottom piston support is provided with a water inlet, the multiple middle multi-stage partition plugs are provided with middle water outlets, and the top arc-shaped outer shell is provided with a top water outlet.

[0010] Preferably, a locking rod is connected to both the pump base and the top block, and a locking nut is threaded onto the threads at both ends of the locking rod. The locking nuts at both ends of the locking rod abut against the outer walls of the pump base and the top block, respectively.

[0011] Preferably, the top of the top block is provided with a vertical plate, the top of the vertical plate is provided with a fixed flange, the permanent magnet output motor is connected to the fixed flange, and the permanent magnet output motor is used to drive the piston pump to work.

[0012] Preferably, the flexible sealing element includes a movable airbag element disposed in the partitioned installation groove. A primary sealing airbag element and a secondary sealing airbag element are provided on both inner walls of the partitioned installation groove. A connecting path is also provided on the central multi-level partition plug. The connecting path is in a connected state with the movable airbag element, the primary sealing airbag element and the secondary sealing airbag element.

[0013] Furthermore, when the multi-stage mounting shell squeezes the movable airbag component in the partition mounting groove, the gas in the movable airbag component will be transported into the primary sealing airbag component and the secondary sealing airbag component through the connecting path.

[0014] Furthermore, a thin sheet is provided in the top partition mounting groove of the bottom piston support and the multiple middle multi-stage partition plugs. The thin sheet abuts against the bottom outer wall of the secondary sealing airbag. The secondary sealing airbag is provided with sealant inside. A one-way valve is provided at the connection between the secondary sealing airbag and the connecting path.

[0015] Furthermore, both the movable airbag component and the primary sealing airbag component are annular, and multiple secondary sealing airbag components are provided, each of which is arc-shaped. The multiple secondary sealing airbag components are connected by a connecting member, and the multiple secondary sealing airbag components and the connecting member together form an annular structure.

[0016] A measurement and control device for a multi-stage partitioned variable displacement plug pump based on a permanent magnet motor includes a differential pressure sensor. The outer wall of the differential pressure sensor is connected to a plug. The differential pressure sensor is also provided with two second connection ends. The middle outlet and the top outlet are each provided with a first connection end corresponding to the second connection end. Multiple differential pressure sensors are provided, and the multiple differential pressure sensors are respectively arranged between adjacent middle outlets and between the uppermost middle outlet and the top outlet. Threaded sleeves are connected to the first connection end and the second connection end.

[0017] Preferably, the differential pressure sensor is connected to the permanent magnet output motor signal, and the target pressure difference range between two adjacent middle water outlets and between the uppermost middle water outlet and the top water outlet is set to be... When the value on the differential pressure sensor is less than the target pressure difference range Then, the permanent magnet output motor is controlled to increase its speed. When the value on the differential pressure sensor is greater than the target pressure difference range... Then, the permanent magnet output motor is controlled to reduce its speed.

[0018] Compared with the prior art, the present invention provides a multi-stage partitioned liquid variable displacement plug pump and a measurement and control device based on a permanent magnet motor, which has the following beneficial effects:

[0019] 1. This multi-stage partitioned variable displacement plug pump based on a permanent magnet motor, when the multi-stage mounting housing is installed, compresses the movable air bladder into a U-shape. At this time, the U-shaped movable air bladder tightly wraps around the multi-stage mounting housing, thus forming a preliminary sealing effect. Secondly, when the movable air bladder is compressed, the gas inside it enters the connecting path, thereby entering the first-stage and second-stage sealing air bladders. At this time, the first-stage and second-stage sealing air bladders injected with gas will expand, thus abutting against the outer wall of the multi-stage mounting housing, forming a seal again, improving the overall sealing effect, ensuring stable delivery, avoiding liquid leakage or crossflow, reducing wear on internal pump components, and extending the service life of the equipment.

[0020] 2. This multi-stage zoned liquid variable displacement plug pump based on a permanent magnet motor is also equipped with a thin plate. When the thin plate punctures the secondary sealing airbag, the sealant will flow out and gradually solidify and fix, thereby forming a seal again, further improving the sealing effect and the overall sealing effect. This can prevent pressure leakage between multiple zones, ensure the actual pressurization capacity of the pump, and meet the working conditions' requirements for liquid delivery pressure and flow rate.

[0021] 3. The measurement and control device for this multi-stage partitioned liquid variable displacement plug pump based on a permanent magnet motor can detect in real time that when the value on the differential pressure sensor is less than the target pressure difference range, the permanent magnet output motor is controlled to increase its speed. This indicates that the actual pressurization capacity does not meet the design requirements. At this time, the sealing performance needs to be checked. If the sealing performance is good, the speed of the permanent magnet output motor needs to be increased to increase the pump's work capacity. When the value on the differential pressure sensor is greater than the target pressure difference range, the pump is over-pressurized, which poses a risk of energy waste and equipment overload. The speed of the permanent magnet output motor needs to be reduced to match the working conditions. Attached Figure Description

[0022] Figure 1 This invention presents a schematic diagram of a multi-stage partitioned variable displacement liquid plug pump based on a permanent magnet motor and its control device. Figure 1 ;

[0023] Figure 2 This invention presents a schematic diagram of a multi-stage partitioned variable displacement liquid plug pump based on a permanent magnet motor and its control device. Figure 2 ;

[0024] Figure 3 This is a front view of a multi-stage partitioned variable displacement liquid plug pump and its control device based on a permanent magnet motor, as proposed in this invention.

[0025] Figure 4 This is a partial cross-sectional schematic diagram of a multi-stage partitioned variable displacement liquid plug pump and its measurement and control device based on a permanent magnet motor, as proposed in this invention.

[0026] Figure 5 This invention proposes a multi-stage partitioned variable displacement liquid plug pump based on a permanent magnet motor and a measurement and control device thereof. Figure 4 An enlarged schematic diagram of part A in the middle;

[0027] Figure 6 This is a schematic diagram of the multi-stage partitioned plug in the middle section of a multi-stage partitioned liquid variable displacement plug pump and its control device based on a permanent magnet motor proposed in this invention.

[0028] Figure 7 This is a cross-sectional schematic diagram of the multi-stage partitioned plug in the middle of a multi-stage partitioned liquid variable displacement plug pump and measurement and control device based on a permanent magnet motor proposed in this invention.

[0029] Figure 8 This is a schematic diagram of the secondary sealing airbag component in a multi-stage partitioned liquid variable displacement plug pump and its measurement and control device based on a permanent magnet motor, as proposed in this invention.

[0030] Figure 9 This is a schematic diagram of the top block in a multi-stage partitioned liquid variable displacement plug pump and its measurement and control device based on a permanent magnet motor, as proposed in this invention.

[0031] In the diagram: 1. Pump base; 101. Top block; 102. Locking rod; 103. Locking nut; 104. Vertical plate; 105. Fixed flange; 106. Permanent magnet output motor; 2. Bottom piston support; 201. Middle multi-stage partition plug; 202. Top piston support; 203. Top arc-shaped outer shell; 204. Multi-stage mounting shell; 205. Inlet; 206. Middle outlet; 207. Top outlet; 208. Thin sheet; 209. First connecting end; 3. Partition mounting groove; 301. Movable airbag; 302. Primary sealing airbag; 303. Secondary sealing airbag; 304. Connecting path; 305. One-way valve; 306. Connecting component; 4. Differential pressure sensor; 401. Plug; 402. Second connecting end; 403. Threaded sleeve. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1:

[0035] Reference Figures 1-9 A multi-stage partitioned liquid variable displacement plug pump based on a permanent magnet motor is characterized by comprising a pump base 1 and a top block 101 connected to each other. Between the pump base 1 and the top block 101 are a bottom piston support 2, multiple middle multi-stage partitioned plugs 201, and a top piston support 202. Adjacent bottom piston supports 2, multiple middle multi-stage partitioned plugs 201, and top piston supports 202 are connected to multi-stage mounting shells 204. Partitioned mounting grooves 3 are provided on the top of the bottom piston support 2, the upper and lower ends of the multiple middle multi-stage partitioned plugs 201, and the bottom of the top piston support 202. Flexible seals are provided within the partitioned mounting grooves 3. The two ends of the multiple multi-stage mounting shells 204 are respectively inserted into different partitioned mounting grooves 3. A top arc-shaped shell 203 is connected to the top piston support 202, and the top block 101 abuts against the top outer wall of the top arc-shaped shell 203. The top of the pump base 1 has an output section, which is a permanent magnet output motor 106.

[0036] In this embodiment, specifically, a rotating shaft is rotatably connected to the pump base 1. Multiple pistons and rotating impellers are provided on the outer wall of the rotating shaft, which enables the multi-stage partitioned liquid variable displacement plug pump to work normally. The pistons and impellers are installed in the bottom piston support 2 and the top piston support 202. The pistons are responsible for precise pressurization in the local high-pressure section, and the impellers are responsible for continuous pressurization under high flow rate. The installation method is the same as the prior art. The output end of the permanent magnet output motor 106 is connected to the rotating shaft through a coupling. When the permanent magnet output motor 106 starts, it can drive the rotating shaft and impeller inside the pump body to rotate to realize water supply operation.

[0037] In this embodiment, when installing the multi-stage partitioned variable displacement plug pump, refer to Figures 1-4 First, a multi-stage mounting housing 204 is connected to the bottom piston support 2. Then, multiple middle multi-stage partition plugs 201 and multi-stage mounting housings 204 are connected sequentially above. During this process, an impeller is simultaneously installed on the rotating shaft. Then, a top piston support 202 is connected to the top multi-stage mounting housing 204. Next, the top arc-shaped housing 203 is abutted against the top piston support 202. Finally, the top block 101 is fitted onto the top arc-shaped housing 203 for positioning. It should be noted that multiple sealing rings are provided at the connection between the top arc-shaped housing 203 and the top piston support 202 to seal the top arc-shaped housing 203 and the top piston support 202.

[0038] Locking rods 102 are connected to both the pump base 1 and the top block 101. Locking nuts 103 are threaded onto the threads at both ends of the locking rods 102. The locking nuts 103 at both ends of the locking rods 102 abut against the outer walls of the pump base 1 and the top block 101, respectively. After the multiple bottom piston supports 2, multiple middle multi-stage partition plugs 201, the top piston support 202, the top arc-shaped outer shell 203, and the multi-stage mounting shell 204 are positioned, locking nuts 103 are connected to both ends of the locking rods 102. Tightening the locking nuts 103 gradually tightens the connections between the multiple components. The two ends of multiple multi-stage mounting housings 204 are respectively inserted into different partition mounting slots 3. Partition mounting slots 3 are provided on the top of the bottom piston support 2, the upper and lower ends of multiple middle multi-stage partition plugs 201, and the bottom of the top piston support 202. This allows the multi-stage mounting housings 204 to be placed stably. The flexible seals set in the partition mounting slots 3 can seal multiple connection parts, improve the overall sealing effect, avoid pressure leakage between multiple partitions, ensure the actual pressurization capacity of the pump, and meet the requirements of the working conditions for liquid delivery pressure and flow.

[0039] Reference Figures 1-4The bottom piston support 2 is provided with a water inlet 205, and multiple middle multi-stage partition plugs 201 are provided with middle water outlets 206. The top arc-shaped outer shell 203 is provided with a top water outlet 207.

[0040] Water can enter the pump body through the inlet 205, and after being pressurized by the pump body, the water can be discharged through different middle outlets 206 and top outlets 207, thus enabling it to be used in different situations.

[0041] Reference Figures 1-4 and Figure 9 The top of the top block 101 is provided with a vertical plate 104, and the top of the vertical plate 104 is provided with a fixed flange 105. The permanent magnet output motor 106 is connected to the fixed flange 105. The permanent magnet output motor 106 is used to drive the plug pump. During installation, the permanent magnet output motor 106 is installed on the fixed flange 105 with bolts. At this time, the output shaft of the permanent magnet output motor 106 is coaxial with the rotating shaft of the pump body. The output shaft is connected to the rotating shaft through a coupling. When the permanent magnet output motor 106 is started, it can drive the rotating shaft to drive the impeller to work. In addition, a pressure relief plug is provided on the outer wall of the top arc-shaped outer shell 203. It can automatically open when the pressure exceeds the safety threshold, quickly release the excessive pressure, and prevent the pump body, impeller, multiple shells and other components from deforming or cracking due to overpressure. This effectively protects the core structure of the pump, extends the service life of the equipment, avoids system failures caused by local overpressure, and ensures the overall stability of the secondary water supply equipment.

[0042] Example 2:

[0043] Reference Figures 1-9 A multi-stage partitioned liquid variable displacement plug pump based on a permanent magnet motor is characterized by comprising a pump base 1 and a top block 101 connected to each other. Between the pump base 1 and the top block 101 are a bottom piston support 2, multiple middle multi-stage partitioned plugs 201, and a top piston support 202. Multiple-stage mounting shells 204 are connected between adjacent bottom piston supports 2, multiple middle multi-stage partitioned plugs 201, and top piston supports 202. Partitioned mounting grooves 3 are provided on the top of the bottom piston support 2, the upper and lower ends of the multiple middle multi-stage partitioned plugs 201, and the bottom of the top piston support 202. Flexible seals are provided within the partitioned mounting grooves 3. The two ends of the multiple multi-stage mounting shells 204 are respectively inserted into different partitioned mounting grooves 3. A top arc-shaped shell 203 is connected to the top piston support 202, and the top block 101 abuts against the top outer wall of the top arc-shaped shell 203. A permanent magnet output motor 106 is provided on the top of the pump base 1.

[0044] Reference Figures 4-9The flexible sealing element includes a movable airbag 301 disposed in the partitioned installation groove 3. A primary sealing airbag 302 and a secondary sealing airbag 303 are provided on both sides of the inner wall of the partitioned installation groove 3. A connecting path 304 is also provided on the multi-level partition plug 201 in the middle. The connecting path 304 is connected to the movable airbag 301, the primary sealing airbag 302 and the secondary sealing airbag 303.

[0045] When the multi-stage mounting housing 204 squeezes the movable airbag component 301 in the partition mounting groove 3, the gas in the movable airbag component 301 will be transported into the primary sealing airbag component 302 and the secondary sealing airbag component 303 through the connecting path 304.

[0046] In this embodiment, when the multi-stage mounting housing 204 compresses the flexible sealing element within the partition mounting groove 3, it specifically compresses the movable airbag 301 within the partition mounting groove 3. The bottom of the movable airbag 301 is fixedly disposed on the inner wall of the partition mounting groove 3, and its top only abuts against the inner wall of the partition mounting groove 3. Therefore, when the multi-stage mounting housing 204 compresses the movable airbag 301, it compresses the gas inside the movable airbag 301. At this time, the multi-stage mounting housing 204 compresses the movable airbag 301 into a U-shape. The U-shaped movable airbag 301 then tightly wraps around the multi-stage mounting housing 204, thereby forming a preliminary sealing effect. Secondly, when the movable airbag 301 is compressed, its internal... Gas enters the connecting path 304, thereby entering the primary sealing airbag 302 and the secondary sealing airbag 303. At this time, the primary sealing airbag 302 and the secondary sealing airbag 303, which are injected with gas, will expand and abut against the outer wall of the multi-stage mounting housing 204, forming a seal again. Furthermore, primary sealing airbags 302 and secondary sealing airbags 303 are provided on both sides of the partitioned mounting groove 3, which can seal against both sides of the multi-stage mounting housing 204, further enhancing the sealing effect. At this time, the primary sealing airbags 302 and secondary sealing airbags 303 on both sides and the movable airbag 301 will form a triple seal, improving the overall sealing performance and ensuring the operation of the pump body.

[0047] Reference Figure 4 and Figure 5 The bottom piston support 2 and the top partition mounting groove 3 of the multiple middle multi-stage partition plugs 201 are also provided with a thin sheet 208. The thin sheet 208 abuts against the bottom outer wall of the secondary sealing airbag 303. The secondary sealing airbag 303 is provided with sealant. A one-way valve 305 is provided at the connection between the secondary sealing airbag 303 and the connecting path 304.

[0048] In this embodiment, a thin sheet 208 is also provided, with a tapered end section. Sealant is provided inside the secondary sealing airbag 303. After gas from the movable airbag 301 enters the secondary sealing airbag 303 through the connecting path 304, the secondary sealing airbag 303 expands and comes into contact with the thin sheet 208. At this time, the tapered thin sheet 208 punctures the secondary sealing airbag 303, causing the sealant inside to flow out and into the space between the movable airbag 301 and the multi-stage mounting housing 204, forming a seal. It should be noted that during the installation of the primary sealing airbag 302 and the secondary sealing airbag 303… The primary sealing airbag 302 and the secondary sealing airbag 303 can be adhered to the inner wall of the partitioned installation groove 3 using an adhesive, and connected to the connecting path 304. Before installation, sealant is injected through the interface connected to the connecting path 304. During installation, the sealant has not yet solidified. When the thin sheet 208 punctures the secondary sealing airbag 303, the sealant will flow out and gradually solidify and fix, thereby forming a seal again. It should be noted that if the thin sheet 208 does not puncture the secondary sealing airbag 303, it will be in close contact with the secondary sealing airbag 303, and the secondary sealing airbag 303 will also be in contact with the outer wall of the multi-stage installation shell 204, which will also form a sealing effect.

[0049] Reference Figures 6-8 Both the active airbag component 301 and the primary sealing airbag component 302 are annular. Multiple secondary sealing airbag components 303 are provided, and all of them are arc-shaped. The multiple secondary sealing airbag components 303 are connected by a connecting member 306. The multiple secondary sealing airbag components 303 and the connecting member 306 together form an annular structure.

[0050] In this embodiment, the sealant is semi-solid when it is placed in the secondary sealing airbag 303. It can flow slowly between the secondary sealing airbags 303 through the connecting member 306 to ensure that the amount of sealant in each area is uniform. It can flow out quickly from the rupture, making it more convenient to use, and at the same time, it can make the sealant flow out more evenly.

[0051] Example 3:

[0052] Reference Figures 1-4A measurement and control device for a multi-stage partitioned liquid variable displacement plug pump based on a permanent magnet motor includes a differential pressure sensor 4. The outer wall of the differential pressure sensor 4 is connected to a plug 401. The differential pressure sensor 4 is also provided with two second connection ends 402. The middle outlet 206 and the top outlet 207 are each provided with a first connection end 209 corresponding to the second connection end 402. There are multiple differential pressure sensors 4. The multiple differential pressure sensors 4 are respectively arranged between adjacent middle outlets 206 and between the uppermost middle outlet 206 and the top outlet 207. The first connection end 209 and the second connection end 402 are connected with threaded sleeves 403.

[0053] In this embodiment, during measurement and control, the two second connection terminals 402 on the differential pressure sensor 4 are respectively connected to the first connection terminals 209 on the adjacent middle outlet 206. The two second connection terminals 402 on the uppermost differential pressure sensor 4 are connected between the uppermost middle outlet 206 and the top outlet 207, so that different outlets can be measured and controlled through the differential pressure sensor 4. In use, the plug 401 on the differential pressure sensor 4 is connected to an external measurement and control system, such as a PLC or digital display. The specific connection method can adopt existing technology, and its function is to provide power and signal output.

[0054] Differential pressure sensor 4 is connected to permanent magnet output motor 106, and the target pressure difference range is set between two adjacent middle outlets 206 and between the uppermost middle outlet 206 and the top outlet 207. When the value on differential pressure sensor 4 is less than the target pressure difference range If the speed of the permanent magnet output motor 106 is increased, it indicates that the actual pressurization capacity has not met the design requirements. In this case, the sealing performance needs to be checked. If the sealing performance is good, the speed of the permanent magnet output motor 106 needs to be increased to increase the pump's work capacity. When the value on the differential pressure sensor 4 is greater than the target pressure difference range... If the pump is overpressurized, there is a risk of energy waste and equipment overload. The speed of the permanent magnet output motor 106 needs to be reduced to match the working conditions.

[0055] in, The specific method for determining it is as follows:

[0056] The theoretical pressure difference threshold is calculated based on the pump's hydraulic parameters. The specific calculation formula is as follows: ,in, This indicates the density of the liquid being pumped. In this application, it refers to pumped clean water. Pick , Represents gravitational acceleration, take , This indicates the design head of the zone, in meters (m). In this application, the pressure is required to be increased to 30 meters of water column.

[0057] Pa.

[0058] Then, the actual threshold is determined through experiments. The specific steps are as follows:

[0059] First, conduct a no-load test to verify the theoretical threshold. First, close multiple outlets of the pump, start the pump, and adjust the speed of the permanent magnet output motor 106 to the rated speed. Then read the value from the differential pressure sensor. and with Comparison; if and If the deviation is less than 5%, then It can be used as an initial threshold. If the deviation is greater than 5%, then test and correct it again.

[0060] The second step involves load testing, gradually opening multiple outlets to simulate actual load, and controlling the flow rate using a flow meter. For design flow Adjust the speed of the permanent magnet output motor 106 to ensure the pump's outlet pressure meets the operating requirements, and simultaneously record the differential pressure sensor readings at this time. Repeat the test with different traffic volumes (e.g., 0.8). 1.2 Record the corresponding pressure difference, plot the flow rate-pressure difference curve, and determine the threshold range under different operating conditions.

[0061] Then, combining the above data, the final threshold range is determined, such as...

[0062] ,

[0063] This is to ensure the pump operates efficiently and stably within this range. It is important to note that as usage continues, the above operation should be repeated periodically to adjust the threshold and ensure accuracy.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage partitioned variable displacement plug pump based on a permanent magnet motor, characterized in that, It includes a pump base (1) and a top block (101) connected to each other. A bottom piston support (2), a plurality of middle multi-stage partition plugs (201) and a top piston support (202) are provided between the pump base (1) and the top block (101). A multi-stage mounting housing (204) is connected between adjacent bottom piston support (2), a plurality of middle multi-stage partition plugs (201) and top piston support (202). The bottom piston support (2) is provided with partition mounting grooves (3) at the top, the upper and lower ends of the multiple middle multi-stage partition plugs (201) and the bottom of the top piston support (202). The partition mounting grooves (3) are provided with flexible seals. The two ends of the multiple multi-stage mounting shells (204) are respectively inserted into different partition mounting grooves (3). The flexible sealing element includes a movable airbag (301) disposed in the partitioned installation groove (3). The inner walls on both sides of the partitioned installation groove (3) are provided with a primary sealing airbag (302) and a secondary sealing airbag (303). The central multi-level partition plug (201) is also provided with a connecting path (304). The connecting path (304) is connected to the movable airbag (301), the primary sealing airbag (302) and the secondary sealing airbag (303). When the multi-stage mounting housing (204) squeezes the movable airbag (301) in the partition mounting groove (3), the gas in the movable airbag (301) will be transported into the primary sealing airbag (302) and the secondary sealing airbag (303) through the connecting path (304).

2. The multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 1, characterized in that, The bottom piston support (2) is provided with an inlet (205), the multiple middle multi-stage partition plugs (201) are provided with middle outlets (206), and the top arc-shaped shell (203) is provided with a top outlet (207).

3. A multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 2, characterized in that, Locking rods (102) are connected to both the pump base (1) and the top block (101). Locking nuts (103) are threaded onto the threads at both ends of the locking rods (102). The locking nuts (103) at both ends of the locking rods (102) abut against the outer walls of the pump base (1) and the top block (101), respectively.

4. A multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 2, characterized in that, The top of the top block (101) is provided with a vertical plate (104), and the top of the vertical plate (104) is provided with a fixed flange (105). The output part is connected to the fixed flange (105). The output part is specifically a permanent magnet output motor (106), which is used to drive the piston pump to work.

5. A multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 2, characterized in that, The bottom piston support (2) and the top partition mounting groove (3) of the multiple middle multi-stage partition plugs (201) are also provided with a thin sheet (208). The thin sheet (208) abuts against the bottom outer wall of the secondary sealing airbag (303). The secondary sealing airbag (303) is provided with sealant inside. The connection between the secondary sealing airbag (303) and the connecting path (304) is provided with a one-way valve (305).

6. A multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 5, characterized in that, The active airbag component (301) and the primary sealing airbag component (302) are both annular. Multiple secondary sealing airbag components (303) are provided, and all of the multiple secondary sealing airbag components (303) are arc-shaped. The multiple secondary sealing airbag components (303) are connected to each other through a connecting member (306). The multiple secondary sealing airbag components (303) and the connecting member (306) together form an annular structure.

7. A measurement and control device for a multi-stage partitioned variable displacement liquid plug pump based on a permanent magnet motor, comprising the multi-stage partitioned variable displacement liquid plug pump based on a permanent magnet motor as described in any one of claims 2-6, characterized in that, The device includes a differential pressure sensor (4), the outer wall of which is connected to a plug (401). The differential pressure sensor (4) is also provided with two second connection ends (402). The middle outlet (206) and the top outlet (207) are each provided with a first connection end (209) corresponding to the second connection end (402). There are multiple differential pressure sensors (4), and the multiple differential pressure sensors (4) are respectively arranged between adjacent middle outlets (206) and between the uppermost middle outlet (206) and the top outlet (207). The first connection end (209) and the second connection end (402) are connected with threaded sleeves (403).

8. The measurement and control device for a multi-stage partitioned variable displacement plug pump based on a permanent magnet motor according to claim 7, characterized in that, The differential pressure sensor (4) is connected to the output signal, and the target pressure difference range between two adjacent middle outlets (206) and between the uppermost middle outlet (206) and the top outlet (207) is set as follows: When the value on the differential pressure sensor (4) is less than the target pressure difference range Then the control output unit increases the rotation speed. When the value on the differential pressure sensor (4) is greater than the target pressure difference range... Then the output unit will reduce the rotation speed.

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