Brushless permanent magnet synchronous frequency conversion diaphragm booster pump

Abstract

The invention discloses a brushless permanent magnet synchronous frequency conversion diaphragm booster pump, and relates to the technical field of water pump equipment. A housing assembly; the action assembly comprises an eccentric wheel, a fixing frame and an elastic diaphragm piece, a plurality of piston cavities are arranged in the fixing frame in pairs, and balance wheels matched with the elastic diaphragm piece to push the elastic diaphragm piece to do reciprocating motion are arranged in the piston cavities; the valve assembly comprises a control body, a plurality of suction valves are installed on one side of the control body, a discharge valve is installed on the other side of the control body, and a plurality of valve plates are flexibly connected to the surface of the discharge valve. When water flow pulse is small, water flow pushes the corresponding valve plate to be opened, the corresponding valve plate on the other side continues to be attached to the interior of the discharge cavity to keep sealing, the discharge valve does not need to be kept in an inclined state during operation, corresponding operation is more stable, and the discharge valve is not prone to being damaged.

Description

Technical Field

[0001] This application relates to the technical field of water pump equipment, and more specifically, to a brushless permanent magnet synchronous variable frequency diaphragm booster pump. Background Technology

[0002] A diaphragm booster pump is a positive displacement pump that uses the reciprocating motion of a flexible diaphragm to increase the pressure of a low-pressure medium (liquid or gas) to a high-pressure medium. It converts driving energy (motor, compressed air, or hydraulic pressure) into the reciprocating movement of the diaphragm, thereby achieving a medium intake-compression-discharge cycle and providing the required boosting effect in the system. A brushless DC motor driven by a permanent magnet synchronous motor (PMSM) can be used in conjunction with a frequency converter to achieve precise speed regulation of the diaphragm's reciprocating motion, thus generating adjustable positive or negative pressure inside the pump body to achieve liquid boosting. Furthermore, the use of a brushless permanent magnet synchronous variable frequency drive eliminates the wear and tear of brushes, significantly improving the equipment's service life and energy efficiency.

[0003] A common diaphragm booster pump drives an eccentric wheel assembly to rotate. The piston actuation zone of the diaphragm is synchronously expanded or compressed by the axial reciprocating motion of the balance wheel. When the piston actuation zone of the diaphragm moves in the expansion direction, the inlet check valve opens, and the source water is drawn into the booster water chamber through the inlet. When the piston actuation zone of the diaphragm moves in the compression direction, the drain check valve opens, and the pressurized water is forced out, enters the high-pressure water chamber through the drain port, and is discharged from the pump through the discharge hole of the pump head cover, providing the required high-pressure water.

[0004] However, the inventors realized that due to the compact internal structure of the pump body, there is usually only one drain check valve. When the eccentric wheel drives multiple pistons to reciprocate, the two pistons that are supposed to be symmetrical will move in opposite directions. At this time, the drain check valve will tilt and drain water from one side. This means that the drain check valve needs to constantly change the tilting direction while opening and closing, which can easily lead to poor sealing. In severe cases, it can even cause the drain check valve to jam.

[0005] To address the aforementioned issues, we provide a brushless permanent magnet synchronous variable frequency diaphragm booster pump. Summary of the Invention

[0006] To address the problems mentioned in the background art, this application provides a brushless permanent magnet synchronous variable frequency diaphragm booster pump.

[0007] The brushless permanent magnet synchronous variable frequency diaphragm booster pump provided in this application adopts the following technical solution: A brushless permanent magnet synchronous variable frequency diaphragm booster pump includes: Motor assemblies, including encapsulated BMC motor stator assemblies and motor rotors; The housing assembly includes a lower housing and a pump head housing, which are fitted together and mounted on the upper end of the motor assembly; The actuation component includes an eccentric wheel, a fixed frame, and an elastic diaphragm. The fixed frame has a plurality of piston chambers arranged in a logarithmic manner, and each piston chamber has a balance wheel that cooperates to drive the elastic diaphragm to reciprocate. The valve assembly includes a control body, on one side of which multiple suction valves are installed and on the other side which discharge valves are installed, and multiple valve plates are flexibly connected to the surface of the discharge valve.

[0008] In some embodiments, a plurality of pressurization chambers corresponding one-to-one with piston chambers are provided on one side of the control body, the suction valve is installed in the pressurization chamber, and a plurality of water inlet holes are provided on the surface of the pressurization chamber. A discharge chamber is provided at the center of the other side of the control body, the discharge valve is installed in the discharge chamber, and a plurality of water outlet holes are provided on the surface of the discharge chamber. An O-ring is also installed at the joint edge between the discharge chamber and the control body. The discharge chamber is also equipped with multiple partitions, and the adjacent partitions form corresponding water outlet areas. Each valve plate of the discharge valve is sealed in the corresponding water outlet area.

[0009] In some embodiments, the eccentric wheel is mounted on the output shaft of the motor rotor and inserted into the fixed frame. The fixed frame is also equipped with a bearing, and the eccentric wheel is mounted in the bearing. The bottom of the fixed frame is also equipped with a bearing pressure plate that cooperates with the fixed bearing. When the eccentric wheel rotates, it can sequentially push the swing wheel in the corresponding piston chamber to move. The motor assembly also includes a motor end cover, which cooperates to press the fixing frame into the lower housing.

[0010] In some embodiments, the elastic diaphragm is further equipped with multiple pistons, the positions of which correspond one-to-one with the piston chambers in the fixed frame, and a diaphragm protective pad is provided between the elastic diaphragm and the fixed frame.

[0011] In some embodiments, the lower housing consists of a plastic sound-absorbing shell and an aluminum alloy frame. The plastic sound-absorbing shell is wrapped around the outer surface of the aluminum alloy frame by injection molding, and a lower housing sealing ring is installed in the joint between the plastic sound-absorbing shell and the aluminum alloy frame.

[0012] In some embodiments, the edge shell of the plastic sound-absorbing housing adopts a double-wall structure, with multiple sound-insulating cavities formed between the double-wall structure; The aluminum alloy frame also has perforations for the piston chamber in the fixing bracket to pass through.

[0013] In some embodiments, an inlet and an outlet are provided through the outer side of the pump head housing, with the inlet and outlet located on the same straight line, dividing the pump head housing into upper and lower spaces. The lower part of the pump head housing is connected to the water inlet and the pressurization chamber; The upper part of the pump head housing is connected to the outlet and discharge chamber.

[0014] In some embodiments, a pressure regulating chamber is also provided in the upper part of the pump head housing, and a control cover is installed on the top of the pressure regulating chamber by screws, and a pressure regulating component is provided in the control cover.

[0015] In some embodiments, the pressure regulating assembly includes a control handle, a preload spring, a spring washer, and a sealing gasket, with the spring washer fixed to one side of the sealing gasket, the preload spring installed between the control handle and the sealing gasket, and the control handle abutting against the control cover to form a fixed position.

[0016] In some embodiments, the outer surface of the encapsulated BMC motor stator assembly is further fitted with a hoop, and a portion of the hoop is fitted with a bracket base, the bracket base being attached to the surface of the encapsulated BMC motor stator assembly; Multiple positioning bosses are also provided around the outer surface of the encapsulated BMC motor stator assembly, and multiple positioning slots that cooperate with the positioning bosses are provided in the bracket base. The support base has pads extending horizontally outward on both sides, and feet are installed at the ends of the pads by screws.

[0017] In summary, in the technical solution of this application embodiment, multiple water outlet areas are separated in the pressurization chamber by multiple partitions. Multiple valve plates of the discharge valve are sealed in the corresponding water outlet areas. During use, due to the cooperation of the eccentric wheel, the two symmetrical swing wheels will move in opposite directions. When this is reflected in the discharge chamber, the water flow on one side flows outward, and the water flow on the other side flows inward. When the water flows outward, it will push the valve plate in the corresponding water outlet area to open. On the other side, because the water flows inward, the corresponding valve plate will continue to be attached to the discharge chamber and remain sealed. During operation, the discharge valve does not need to be kept in an inclined state, and the operation is more stable and less prone to damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance of the booster pump in this application; Figure 2 This is a structural schematic diagram of the bracket base of this application; Figure 3 This is a schematic diagram of the disassembled booster pump of this application; Figure 4 This is an exploded view of the lower housing and pump head housing of this application; Figure 5 This is an exploded view of the lower shell of this application; Figure 6 This is a schematic diagram of the connection between the lower housing and the fixing frame in this application; Figure 7 This is an exploded view of the valve assembly of this application; Figure 8 This is an exploded view of the action components of this application; Figure 9 This is a schematic diagram showing the connection between the fixing frame and the elastic diaphragm sheet in this application; Figure 10 This is an exploded view of the pressure regulating component of this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Motor assembly; 11. Encapsulated BMC motor stator assembly; 1101. Positioning boss; 12. Motor rotor; 13. Motor end cover; 14. Bracket base; 1401. Positioning slot; 1402. Foot; 15. Hoop; 2. Housing assembly; 21. Lower housing; 2101. Plastic sound-absorbing housing; 2102. Aluminum alloy middle frame; 2103. Sound insulation cavity; 2104. Lower housing sealing ring; 22. Pump head housing; 2201. Inlet; 2202. Outlet; 2203. Pressure regulating cavity; 2204. Sealing gasket; 2205. Spring washer; 2206. Preload spring; 2207. Control handle; 2208. Control cover; 3. Actuating components; 31. Eccentric wheel; 3101. Bearing; 3102. Bearing pressure plate; 32. Fixing frame; 33. Elastic diaphragm; 3301. Diaphragm protective pad; 34. Piston; 4. Valve assembly; 41. Control body; 4101. Pressure chamber; 4102. Water inlet; 4103. Discharge chamber; 4104. Partition; 4105. Water outlet; 4106. O-ring; 42. Suction valve; 43. Discharge valve; 4301. Valve plate. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1 to 10 The present invention will be described in further detail below.

[0021] In the description of this application, it should be understood that the terms "thickness," "upper," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] It should be noted that the accompanying drawings are schematic and not to scale. For clarity and convenience, the relative dimensions and proportions of the parts shown are exaggerated or reduced in size; all dimensions are merely illustrative and not limiting. Furthermore, the same reference numerals are used for the same structures, elements, or fittings appearing in more than two drawings to indicate similar features.

[0023] In related technologies, due to the compact internal structure of the pump body, there is usually only one drain check valve. When the eccentric wheel drives multiple pistons to reciprocate, the two pistons that are symmetrical will move in opposite directions. At this time, the drain check valve will tilt and drain water from one side. This means that the drain check valve needs to constantly change the tilting direction while opening and closing, which can easily lead to poor sealing. In severe cases, it can even cause the drain check valve to jam. Reference Figure 1 , Figure 3 As shown, the variable frequency diaphragm booster pump of this application includes a motor assembly 1, a housing assembly 2, an actuation assembly 3, and a valve assembly 4. The housing assembly 2 includes a lower housing 21 and a pump head housing 22, which are installed together on the upper end of the motor assembly 1 to facilitate the formation of the pump body housing. In this embodiment of the application, the motor assembly 1 includes a plastic-encapsulated BMC motor stator assembly 11 and a motor rotor 12. When the power supply controlled by the frequency converter is turned on, the plastic-encapsulated BMC motor stator assembly 11 will generate a rotating magnetic field, which drives the motor rotor 12 to start rotating at high speed. The use of frequency conversion technology allows for precise control of the motor speed, thereby adjusting the pump flow rate and output pressure. In addition, a motor end cover 13 is also fitted on the output shaft of the motor rotor 12, which can be used to maintain a stable connection with the lower housing 21.

[0024] Reference Figure 3 , Figure 8 , Figure 9 As shown in the embodiment of this application, the eccentric wheel 31 in the outer shell assembly 2 is mounted on the output shaft of the motor rotor 12 and inserted into the fixed frame 32. Multiple piston chambers are arranged in the fixed frame 32 in a parallel manner, and a balance wheel is slidably installed in the piston chamber. When the eccentric wheel 31 rotates, it can sequentially push the balance wheel in the multiple piston chambers to perform reciprocating motion. Correspondingly, the specific way in which the balance wheel and the eccentric wheel 31 cooperate in the piston chamber has been disclosed in the prior art. For details, please refer to the Chinese patent application with application number CN202010407682.3, which will not be repeated here. In order to maintain the effective connection between the eccentric wheel 31 and the fixed frame 32, a bearing 3101 is also installed in the fixed frame 32. The eccentric wheel 31 is fitted in the bearing 3101. A bearing pressure plate 3102 that cooperates to fix the bearing 3101 is also installed at the bottom of the fixed frame 32. In addition, the upper end of the fixed frame 32 is also sealed with an elastic diaphragm 33. Multiple pistons 34 are installed on the elastic diaphragm 33. The positions of the pistons 34 and the piston chambers correspond one-to-one. When the swing wheel in the piston chamber moves away from the piston 34, it can pull the piston 34 and the elastic diaphragm 33 to move together, thereby causing a change in pressure, which facilitates the extraction of source water. When the swing wheel in the piston chamber moves closer to the piston 34, it can push the piston 34 and the elastic diaphragm 33 away together. Conversely, it will squeeze out the extracted water, completing the pumping-draining steps. In order to maintain a sealed fit between the elastic diaphragm 33 and the fixing frame 32, a diaphragm protective pad 3301 is also provided in this embodiment, which is disposed between the elastic diaphragm 33 and the fixing frame 32.

[0025] Reference Figure 3 , Figure 4 , Figure 7 As shown in the embodiment of this application, a control body 41 is also provided. A plurality of pressurization chambers 4101 are provided on one side of the control body 41. An intake valve 42 is installed in the pressurization chamber 4101. An exhaust chamber 4103 is provided at the center of the other side of the control body 41. An exhaust valve 43 is installed in the exhaust chamber 4103. The pressurization chambers 4101 correspond one-to-one with the piston chambers. Therefore, when the movement of the balance wheel in the piston chamber drives the piston 34 to move, it can cause a change in the air pressure inside the pressurization chamber 4101. Multiple partitions 4104 are also provided in the discharge chamber 4103. The adjacent partitions 4104 form corresponding water outlet areas. Each valve plate 4301 of the discharge valve 43 is sealed in the corresponding water outlet area. Specifically, when the piston 34 moves away from the pressurization chamber 4101, it reduces the pressure inside the pressurization chamber 4101, which pulls the suction valve 42 to open the water inlet 4102. At this time, external source water can enter the pressurization chamber 4101 through the water inlet 4102. Since the bottom spaces of multiple pressurization chambers 4101 are connected, the incoming water will mix in the bottom space of the control body 41. When the piston 34 moves closer to the control body 41, it will compress the internal space of the control body 41, thereby expelling the water. The water is discharged through the outlet hole 4105 on the chamber 4103, and when the eccentric wheel 31 is running, it will simultaneously drive the two corresponding balance wheels to move in opposite directions. Therefore, when the piston 34 on one side draws water through the pressurization chamber 4101, the piston 34 on the other side will squeeze the bottom space of the control body 41, which can push the discharge valve 43 to move and open the valve plate 4301 on the corresponding side, so that the water can be discharged through the corresponding outlet area. The corresponding discharge valve 43 only needs to open the valve plate 4301 in the corresponding outlet area, without the need for overall tilting, so it is more stable and durable in use. Accordingly, in this embodiment, an inlet 2201 and an outlet 2202 are provided on the outer side of the pump head housing 22. The inlet 2201 and the outlet 2202 are located on the same straight line. The pump head housing 22 is divided into upper and lower spaces. The lower space of the pump head housing 22 is connected to the inlet 2201 and the pressurization chamber 4101. When in use, the source water can be drawn in through the inlet 2201 in the pump head housing 22 and enter the pressurization chamber 4101 through the inlet hole 4102. The upper space of the pump head housing 22 is connected to the outlet 2202 and the discharge chamber 4103. After the water inside the pressurization chamber 4101 enters the control body 41, it is discharged into the upper space of the pump head housing 22 through the outlet hole 4105 and then discharged outward through the outlet 2202, thus facilitating the pumping and drainage operation. In addition, in this embodiment, an O-ring 4106 is provided. The O-ring 4106 is made of rubber and is installed in the joint between the discharge cavity 4103 and the control body 41, so as to maintain the sealing fit between the control body 41 and the discharge cavity 4103.

[0026] Reference Figures 3 to 6 As shown in the embodiment of this application, the lower housing 21 is composed of a plastic sound-absorbing shell 2101 and an aluminum alloy frame 2102. The plastic sound-absorbing shell 2101 is wrapped around the outer surface of the aluminum alloy frame 2102 by injection molding and plastic coating. A lower housing sealing ring 2104 is also installed in the joint between the plastic sound-absorbing shell 2101 and the aluminum alloy frame 2102. The method of using a plastic sound-absorbing shell 2101 to wrap the aluminum alloy middle frame 2102 can maintain the insulation performance of the pump body surface, reduce the amount of aluminum alloy used, reduce the weight, and the plastic appearance also has excellent rust prevention and decoration. In the existing technology, the exposed aluminum alloy of the motor end cover and the lower shell requires surface anti-rust spraying or electrophoresis. The use of injection molding can reduce environmental hazards and has certain progressive significance in terms of reducing energy consumption and costs, reducing product weight and ecological environmental protection. In addition, the edge shell of the plastic sound-absorbing shell 2101 in this embodiment adopts a double-wall structure, and multiple sound-insulating cavities 2103 are opened between the double-wall structure, which can prevent the outward transmission of pump noise and achieve the effect of noise reduction.

[0027] Reference Figure 3 , Figure 4 , Figure 10As shown in the embodiment of this application, a pressure regulating chamber 2203 is also provided in the upper part of the pump head housing 22. A control cover 2208 is installed on the top of the pressure regulating chamber 2203 by screws. A control handle 2207, a preload spring 2206, a spring washer 2205 and a sealing gasket 2204 are provided in the control cover 2208. The sealing gasket 2204 is sealed and installed in the upper part of the pump head housing 22 to buffer the water flow pulse entering the upper part of the pump head housing 22. Specifically, the spring washer 2205 is fixed to one side of the sealing gasket 2204, and the preload spring 2206 is installed between the control handle 2207 and the sealing gasket 2204. In addition, the spring washer 2205 can also be rotatably installed on the sealing gasket 2204. The end of the preload spring 2206 is clamped in the spring washer 2205. As the preload spring 2206 is compressed, a preload load can be applied to the sealing gasket 2204. The control handle 2207 abuts against the control cover 2208 to form a fixation. The preload spring 2206 can provide a certain preload load to the sealing gasket 2204, which can absorb the vibration or pressure fluctuation of the water flow pulse, avoid the water flow pulse from directly impacting the pump head housing 22, improve system stability, and extend the service life of components. In addition, the control cover 2208 can also have an adjustment hole, so that the position of the control handle 2207 in the control cover 2208 can be adjusted by using a screwdriver or other tools. Specifically, a thread can be provided on the inner wall of the control cover 2208, and the control handle 2207 is threadedly installed in the control cover 2208. The preload of the preload spring 2206 can be adjusted by adjusting the control handle 2207. It can be appropriately adjusted according to the operating speed of the motor rotor 12 to ensure more stable operation.

[0028] Reference Figure 1 , Figure 2 As shown in the embodiment of this application, the outer surface of the encapsulated BMC motor stator assembly 11 is also fitted with a hoop 15, and a part of the hoop 15 is also fitted with a bracket base 14. The bracket base 14 is attached to the surface of the encapsulated BMC motor stator assembly 11. The two sides of the bracket base 14 have pads extending horizontally outward. The end of the pads is fitted with a foot 1402 by screws. The bracket base 14 can be fixed on the encapsulated BMC motor stator assembly 11 by the hoop 15, thereby facilitating the installation and positioning of the motor assembly 1. To ensure effective fixation between the bracket base 14 and the encapsulated BMC motor stator assembly 11, multiple positioning bosses 1101 are provided around the outer surface of the encapsulated BMC motor stator assembly 11, and multiple positioning slots 1401 are provided in the bracket base 14 to cooperate with the positioning bosses 1101. Through the cooperation between the positioning bosses 1101 and the positioning slots 1401, the encapsulated BMC motor stator assembly 11 can be easily fixed in the bracket base 14 and kept stable.

[0029] All standard parts used in this application can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from the spirit and scope of this application, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A brushless permanent magnet synchronous variable frequency diaphragm booster pump, characterized in that, include: The motor assembly (1) includes a plastic-encapsulated BMC motor stator assembly (11) and a motor rotor (12); The outer casing assembly (2) includes a lower casing (21) and a pump head casing (22), which are fitted together and installed on the upper end of the motor assembly (1); The actuation component (3) includes an eccentric wheel (31), a fixed frame (32) and an elastic diaphragm (33). The fixed frame (32) has a plurality of piston chambers arranged in a logarithmic manner, and a balance wheel is arranged in the piston chamber to drive the elastic diaphragm (33) to reciprocate. The valve assembly (4) includes a control body (41), on one side of the control body (41) are multiple suction valves (42) and on the other side are discharge valves (43), and multiple valve plates (4301) are softly connected to the surface of the discharge valve (43). The control body (41) has multiple pressurization chambers (4101) on one side, each corresponding to a piston chamber. A suction valve (42) is installed in the pressurization chamber (4101). Multiple water inlet holes (4102) are opened on the surface of the pressurization chamber (4101). A discharge chamber (4103) is provided at the center of the other side of the control body (41). A discharge valve (43) is installed in the discharge chamber (4103). Multiple water outlet holes (4105) are opened on the surface of the discharge chamber (4103). An O-ring (4106) is also installed at the joint edge between the discharge chamber (4103) and the control body (41). The discharge chamber (4103) is also provided with multiple partitions (4104), and the adjacent partitions (4104) form corresponding water outlet areas. Each valve plate (4301) of the discharge valve (43) is sealed in the corresponding water outlet area.

2. The brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: The eccentric wheel (31) is mounted on the output shaft of the motor rotor (12) and inserted into the fixed frame (32). The fixed frame (32) is also equipped with a bearing (3101). The eccentric wheel (31) is mounted in the bearing (3101). The bottom of the fixed frame (32) is also equipped with a bearing pressure plate (3102) that cooperates with the fixed bearing (3101). When the eccentric wheel (31) rotates, it can sequentially push the swing wheel in the corresponding piston chamber to move. The motor assembly (1) also includes a motor end cover (13), which cooperates to press the fixing frame (32) into the lower housing (21).

3. The brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: The elastic diaphragm (33) is also equipped with multiple pistons (34), the positions of the pistons (34) and the piston chambers in the fixed frame (32) correspond one-to-one, and a diaphragm protective pad (3301) is also provided between the elastic diaphragm (33) and the fixed frame (32).

4. The brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: The lower housing (21) is composed of a plastic sound-absorbing shell (2101) and an aluminum alloy frame (2102). The plastic sound-absorbing shell (2101) is wrapped around the outer surface of the aluminum alloy frame (2102) by injection molding. A lower housing sealing ring (2104) is also installed in the joint between the plastic sound-absorbing shell (2101) and the aluminum alloy frame (2102).

5. A brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 4, characterized in that: The edge shell of the plastic sound-absorbing shell (2101) adopts a double-wall structure, and multiple sound-insulating cavities (2103) are opened between the double-wall structure. The aluminum alloy frame (2102) also has a perforation for the piston chamber in the fixing bracket (32) to pass through.

6. The brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: An inlet (2201) and an outlet (2202) are provided on the outside of the pump head housing (22). The inlet (2201) and the outlet (2202) are located on the same straight line, and the pump head housing (22) is divided into upper and lower spaces. The lower part of the pump head housing (22) is connected to the water inlet (2201) and the booster chamber (4101); The upper part of the pump head housing (22) is connected to the outlet (2202) and the discharge chamber (4103).

7. The brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: The upper part of the pump head housing (22) is also provided with a pressure regulating chamber (2203). The top of the pressure regulating chamber (2203) is fitted with a control cover (2208) by screws. The control cover (2208) is provided with a pressure regulating component.

8. A brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 7, characterized in that: The pressure regulating assembly includes a control handle (2207), a preload spring (2206), a spring washer (2205), and a sealing gasket (2204). The spring washer (2205) is fixed to one side of the sealing gasket (2204), the preload spring (2206) is installed between the control handle (2207) and the sealing gasket (2204), and the control handle (2207) abuts against the control cover (2208) to form a fixed position.

9. A brushless permanent magnet synchronous variable frequency diaphragm booster pump according to claim 1, characterized in that: The outer surface of the encapsulated BMC motor stator assembly (11) is also fitted with a hoop (15), and a part of the hoop (15) is also fitted with a bracket base (14), which is attached to the surface of the encapsulated BMC motor stator assembly (11). A number of positioning bosses (1101) are provided around the outer surface of the encapsulated BMC motor stator assembly (11), and a number of positioning slots (1401) that cooperate with the positioning bosses (1101) are provided in the bracket base (14). The support base (14) has pads extending horizontally outward on both sides, and feet (1402) are installed at the ends of the pads by screws.

Images