A plunger pump driven by a series excited motor

Abstract

The application discloses a plunger pump driven by a series excited motor, which comprises a shell and a base, a water inlet pipe and a water outlet pipe are arranged on the base, a connecting body is arranged between the shell and the base, at least one plunger hole and one water flow channel are arranged in the connecting body, a plunger assembly is slidably arranged in the shell and partially extends into the plunger hole, a through hole is arranged on the side of the plunger hole and is communicated with the water flow channel, a water guide cavity and a water tank are arranged on the base, all the water flow channels are communicated with the water guide cavity, the water guide cavity and the water tank are communicated through a through hole, and the water tank is communicated with the water outlet pipe. The application has the beneficial effects that: the internal space of the plunger hole is compressed by the plunger assembly, so that the water in the plunger hole is pressurized, the moving path of the plunger assembly is the same as the water flow path, and the pressure borne by the sealing assembly can be ensured to be consistent; in addition, the flow direction of the high-pressure water is limited by the one-way valve, and the utility model has the advantages of high pressurization efficiency, good stability, long service life and the like.

Description

Technical Field

[0001] This application relates to the field of plunger pump technology, and more particularly to a plunger pump driven by a series-wound motor. Background Technology

[0002] A high-pressure washer is a highly efficient cleaning tool that primarily uses high-pressure liquid generated by a high-pressure water pump to clean the surface of objects. When the impact force of the high-pressure water exceeds the adhesion between the dirt and the object's surface, the high-pressure water peels off and washes away the dirt. The high-pressure water pump, as the core component of the high-pressure washer, works by manipulating the water inside its chamber to create high-pressure water. The structure of high-pressure water pumps mainly includes centrifugal and plunger types. Plunger-type high-pressure water pumps pressurize the water inside through the reciprocating motion of an internal plunger, and then the high-pressure water is discharged from the pump through the outlet pipe.

[0003] As the driving component of a plunger pump, the motor's power determines the pump's pressurization effect. Series-wound motors, also known as series-excited motors, offer advantages such as high starting torque, small size, and light weight. They automatically adjust speed according to load changes and exhibit minimal current and voltage fluctuations under overload conditions, making them ideal for scenarios with frequent start-stop cycles. However, in existing technologies, the water path of most plunger pumps is a straight line, resulting in greater impact forces on the internal sealing structure. Under high water pressure, this can cause the seals to break, leading to insufficient water pressure. Furthermore, traditional plunger pumps typically rely on a single plunger in reciprocating motion, resulting in low pressurization efficiency. Therefore, it is necessary to optimize the internal water path structure of plunger pumps. Utility Model Content

[0004] One objective of this application is to provide a series-wound motor driven piston pump that can solve at least one of the defects in the above-mentioned background art.

[0005] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a series-wound motor driven plunger pump, comprising a housing and a base, wherein an inlet pipe and an outlet pipe are provided on the base, a connector is installed between the housing and the base, the connector being provided with at least one plunger hole and a water flow channel, a plunger assembly is slidably installed in the housing, and a portion of the plunger assembly extends into the plunger hole; a through hole communicating with the water flow channel is provided on the side of the plunger hole; a water guide cavity and a water tank are provided on the base, and all water flow channels are communicating with the water guide cavity, the water guide cavity and the water tank are connected through a through hole, and the water tank is communicating with the outlet pipe.

[0006] With the above setup, when the machine starts, water flows into the plunger orifice. The plunger assembly moves downward and compresses the space inside the plunger orifice, squeezing the water within. Subsequently, the water in the plunger orifice is squeezed into the perforation, forming a high-pressure water flow. The plunger assembly moves in the same direction as the water flow, ensuring consistent pressure around the sealing assembly. When the plunger assembly moves upward, water from the inlet pipe re-enters the plunger orifice to await the next compression. Meanwhile, water from multiple flow channels converges in the guide chamber and is further pressurized, thereby increasing the water flow pressure.

[0007] Preferably, the connector is provided with a mounting portion communicating with the plunger orifice, and a first one-way valve for sealing the plunger orifice is installed in the mounting portion. The first one-way valve is located below the perforation. This arrangement allows the first one-way valve to limit the direction of water flow in the plunger orifice, preventing water pressure reduction due to backflow.

[0008] Preferably, a spring is installed on the first one-way valve, with one end of the spring abutting against the first one-way valve and the other end abutting against the mounting part. With this configuration, when the plunger assembly is not sealing, the water flow below the first one-way valve can push it to overcome the spring pressure, allowing water from the inlet pipe to enter the plunger orifice. When the plunger assembly is pressed down, the spring, under its own elasticity and the pressure within the plunger orifice, pulls the first one-way valve to close the plunger orifice, further increasing the closing speed of the first one-way valve and allowing as much water as possible to be discharged into the water flow channel.

[0009] Preferably, the number of plunger holes is three, and the number of water flow channels corresponds to the number of plunger holes, with each channel corresponding to the previous one. The three plunger holes are evenly spaced around the central axis of the connecting body. The housing has mounting holes aligned with the plunger holes, and the plunger assembly is slidably mounted in these mounting holes. This configuration further improves the pressurization efficiency of the plunger pump, and the cooperation of multiple plunger assemblies makes the pump's output water more stable.

[0010] Preferably, the plunger assembly includes a plunger rod, a limiting plate, and an elastic element. The plunger rod extends sequentially into the mounting hole and the plunger bore. The limiting plate is fixedly installed on the plunger rod at the end away from the plunger bore. One end of the elastic element abuts against the limiting plate, and the other end abuts against the housing. This configuration allows the initial position of the plunger rod to be limited by the supporting action of the spring and the limiting plate. In the initial state, the spring supports the plunger rod, allowing water to enter the plunger bore. When the plunger rod compresses the internal space of the plunger bore under external force, the limiting plate compresses the spring and stores elastic force. After the external force on the plunger rod disappears, the spring pushes the plunger rod upward and returns it to its initial position.

[0011] Preferably, a second one-way valve is installed in the water flow channel, a third one-way valve is installed in the water guiding cavity, and a sealing block for sealing the water tank is installed below the water tank. This configuration allows the second and third one-way valves to limit the water flow direction, preventing backflow and pressure drop; the sealing block can then be removed for cleaning when the water tank is clogged.

[0012] Preferably, both the second and third check valves are equipped with sealing structures. This configuration further improves the sealing performance of the second and third check valves, preventing water from flowing back through gaps.

[0013] Preferably, the base is provided with a mounting groove communicating with the water guiding cavity, and a pressure relief valve assembly is installed in the mounting groove. This configuration allows the pressure relief valve assembly to control the air pressure inside the water pump to always remain within a safe range, preventing excessive internal pressure from damaging the water pump. If the pressure inside the water pump is too high, the pressure relief valve will open and release pressure until the pressure inside the water pump is within a safe range before closing.

[0014] Preferably, the assembly also includes a series-wound motor, and a propulsion assembly is installed inside the housing. The drive rod of the series-wound motor is connected to the propulsion assembly, which drives the plunger assembly to slide towards the base. With this configuration, the rotation of the series-wound motor drives the propulsion assembly to operate, thereby causing the plunger assembly to seal the plunger hole.

[0015] Preferably, the propulsion assembly includes a mounting plate and a drive plate. A cooperating gear structure is provided between the mounting plate and the drive rod of the series-wound motor. The drive plate is fixedly mounted on the mounting plate and is inclined relative to the mounting plate. This configuration allows the plunger assemblies to be squeezed sequentially by the inclined drive plate, ensuring that multiple plunger assemblies do not block simultaneously, thus making the water output of the plunger pump more stable.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The plunger assembly compresses the internal space of the plunger orifice to pressurize the water within. The plunger assembly's movement path aligns with the water flow path, ensuring consistent pressure around the sealing assembly. One-way valves are installed in the plunger orifice, water flow channels, and water tank to restrict the flow direction of the high-pressure water, preventing backflow and pressure reduction. As the plunger assembly moves upward, water from the inlet pipe re-enters the plunger orifice to await the next compression. Water from multiple flow channels converges in the guide chamber and is further pressurized, thereby increasing the water pressure.

[0017] Multiple plunger assemblies work alternately under the drive of tilted drive wheels, which can further improve the pressurization efficiency of the plunger pump and ensure the stability of the plunger pump operation; in addition, the pressure relief valve at the water tank controls the air pressure in the plunger pump to always be within a safe range, thereby improving the service life of the plunger pump. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the plunger pump in this application.

[0019] Figure 2 This is a cross-sectional structural diagram of the plunger pump in this application.

[0020] Figure 3 This is a schematic diagram of the connector structure in this application.

[0021] Figure 4 This is a schematic diagram of the base structure in this application.

[0022] Figure 5 This is a partial cross-sectional structural diagram of the plunger pump in this application.

[0023] In the diagram: 1. Housing; 11. Mounting hole; 100. First check valve; 2. Base; 21. Inlet pipe; 22. Outlet pipe; 23. Water guide chamber; 24. Water tank; 25. Mounting groove; 200. Second check valve; 230. Through hole; 3. Connector; 31. Piston hole; 32. Water flow channel; 33. Mounting part; 300. Third check valve; 310. Perforation; 4. Piston assembly; 41. Piston rod; 42. Limiting plate; 43. Elastic element; 400. Sealing block; 5. Pressure relief valve assembly; 500. Series motor; 6. Propulsion assembly; 61. Mounting plate; 62. Drive plate. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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 should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] One aspect of this application provides a series-wound motor driven piston pump, one preferred embodiment of which is, for example... Figures 1-5 As shown, the device includes a housing 1 and a base 2. The base 2 is equipped with an inlet pipe 21 and an outlet pipe 22. A connector 3 is installed between the housing 1 and the base 2. The connector 3 contains a plunger hole 31 and a water flow channel 32. The plunger hole 31 is connected to the inlet pipe 21, and a perforation 310 is provided on the side wall of the plunger hole 31 to allow the plunger hole 31 and the water flow channel 32 to communicate. Water can flow through the perforation 310 in the plunger hole 31 into the water flow channel 32 for transmission. The base 2 is equipped with a water guiding cavity 23 and a water tank 24. One end of the water guiding cavity 23 is connected to the water flow channel 32, and the other end is connected to the water tank 24 through a through hole 230. The water tank 24 is connected to the outlet pipe 22, ensuring that the high-pressure water in the water flow channel 32 can sequentially pass through the water guiding cavity 23 and the water tank 24 before flowing into the outlet pipe 22.

[0029] Furthermore, such as Figure 2 As shown, to increase the water pressure within the plunger orifice 31, a plunger assembly 4 is slidably installed within the housing 1, with a portion of the plunger assembly 4 extending into the plunger orifice 31. When the machine starts, water flows into the plunger orifice 31, and the plunger assembly 4 moves downward, compressing the space within the plunger orifice 31 to squeeze the water. Subsequently, the water in the plunger orifice 31 is squeezed into the perforation 310, forming a high-pressure water flow. When the plunger assembly 4 moves upward, the water in the inlet pipe 21 re-enters the plunger orifice 31 to await the next squeezing; meanwhile, the water in the multiple water flow channels 32 converges in the water guide cavity 23 and is further pressurized, thereby increasing the water flow pressure.

[0030] As a supplement, the movement path of the plunger assembly 4 is the same as the water flow path to ensure that the pressure on the periphery of the sealing assembly is consistent. In addition, a seal is installed in the plunger hole 31, which is sealed and inserted into the plunger rod 41 to prevent water in the plunger hole 31 from entering the housing 1 through the plunger assembly 4.

[0031] In this embodiment, as Figure 2As shown, the connector 3 is provided with a mounting part 33 that communicates with the plunger hole 31. A first one-way valve 100 for sealing the plunger hole 31 is installed in the mounting part 33, and the first one-way valve 100 is located below the through hole 310. The direction of water flow in the plunger hole 31 can be limited by the first one-way valve 100 to ensure that the water flow can only enter the plunger hole 31 in one direction through the first one-way valve 100, so as to avoid the water in the plunger hole 31 flowing back into the water inlet pipe 21 when the plunger assembly 4 squeezes, which would cause the water pressure to drop.

[0032] Specifically, such as Figure 2 As shown, a spring is installed on the first check valve 100, and the spring is sleeved on the first check valve 100. The first check valve 100 is provided with a limiting part. One end of the spring abuts against the limiting part of the first check valve 100, and the other end abuts against the mounting part 33, so that when the first check valve 100 is displaced, the spring can deform simultaneously. When the plunger assembly 4 is not working, the water flow below the first check valve 100 can push the first check valve 100 to overcome the spring pressure, allowing the water in the inlet pipe 21 to enter the plunger hole 31. When the plunger assembly 4 is pressed down, the spring, under its own elastic force and the pressure in the plunger hole 31, pulls the first check valve 100 to close the plunger hole 31, further increasing the closing speed of the first check valve 100, so that as much water as possible in the plunger hole 31 is discharged into the water flow channel 32.

[0033] In this embodiment, as Figure 3 As shown, to further improve the working efficiency of the plunger pump, there are three plunger holes 31. The number of water flow channels 32 is the same as the number of plunger holes 31, and they correspond one-to-one. The three plunger holes 31 are evenly distributed around the central axis of the connecting body 3 to ensure that the three plunger assemblies 4 can uniformly pressurize the water in the plunger pump, which can further improve the pressurization efficiency of the plunger pump and make the water output of the plunger pump more stable. In addition, the housing 1 is provided with mounting holes 11 aligned with the plunger holes 31, and the plunger assembly 4 is slidably mounted in the mounting holes 11.

[0034] Furthermore, such as Figure 4 As shown, the water guiding cavity 23 is simultaneously connected to three water flow channels 32, meaning that all high-pressure water will converge in the water guiding cavity 23. The bottom of the water guiding cavity 23 is connected to the water tank 24 only through a through hole 230. The through hole 230 is located at the edge of the water guiding cavity 23. The bottom of the water guiding cavity 23 is inclined, and the through hole 230 is located at the lowest point of the water guiding cavity 23, so that the water in the water guiding cavity 23 can quickly reach the through hole 230, reducing the pressure loss of the high-pressure water flowing in the water guiding cavity 23.

[0035] In this embodiment, as Figure 2As shown, the plunger assembly 4 includes a plunger rod 41, a limiting plate 42, and an elastic element 43. The plunger rod 41 extends sequentially into the mounting hole 11 and the plunger hole 31. The limiting plate 42 is fixedly installed on the plunger rod 41 at one end away from the plunger hole 31. One end of the elastic element 43 abuts against the limiting plate 42, and the other end abuts against the housing 1. The initial position of the plunger rod 41 is limited by the supporting action of the spring and the limiting plate 42. In the initial state, the spring supports the plunger rod 41 to ensure that the water outlet pipe 22 and the plunger hole 31 are in a conductive state. When the plunger rod 41 is compressed into the internal space of the plunger hole 31 under the action of external force, the limiting plate 42 compresses the spring and stores the elastic force. After the external force on the plunger rod 41 disappears, the spring pushes the plunger rod 41 upward and returns it to the initial position.

[0036] It should be noted that a certain gap should be left between the plunger rod 41 and the plunger hole 31 so that water in the plunger hole 31 can enter the perforation 310 through this gap.

[0037] Specifically, such as Figure 5 As shown, to prevent high-pressure water from flowing back before entering the outlet pipe 22, a second check valve 200 is installed in the water flow channel 32, and a third check valve 300 is installed in the water guide chamber 23. The second check valve 200 and the third check valve 300 limit the direction of water flow to prevent water backflow from causing a drop in water pressure. When the plunger rod 41 compresses the water, the water pressure increases, and at this time, the high-pressure water can flow through the valve cores of the second check valve 200 and the third check valve 300.

[0038] Furthermore, a sealing block 400 for sealing the water tank 24 is installed below the water tank 24, and the sealing block 400 is detachable. When the water tank 24 is blocked, the sealing block 400 can be removed for cleaning.

[0039] In this embodiment, as Figure 5 As shown, the base 2 is provided with an installation groove 25 that communicates with the water guide cavity 23. A pressure relief valve assembly 5 is installed in the installation groove 25. The pressure relief valve assembly 5 controls the air pressure in the water pump to always be kept within a safe range, so as to avoid damage to the water pump due to excessive internal pressure. When the pressure in the plunger pump is too high, the pressure relief valve automatically opens and releases pressure until the pressure in the plunger pump is within a safe range before closing.

[0040] In this embodiment, as Figure 1 and Figure 2 As shown, the plunger pump also includes a series-wound motor 500, and a propulsion assembly 6 is installed inside the housing 1. The drive rod of the series-wound motor 500 is connected to the propulsion assembly 6. The propulsion assembly 6 is used to drive the plunger assembly 4 to slide towards the base 2. When the series-wound motor 500 is working, it can drive the propulsion assembly 6 to work, thereby driving the plunger assembly 4 to move within the plunger hole 31.

[0041] Specifically, such as Figure 2 As shown, the propulsion assembly 6 includes a mounting plate 61 and a drive plate 62. A gear structure is provided between the mounting plate 61 and the drive rod of the series-wound motor 500. When the series-wound motor 500 operates, the mounting plate 61 rotates synchronously with the drive rod of the series-wound motor 500 through the gear engagement. The drive plate 62 is fixedly connected to the mounting plate 61 and is inclined relative to the mounting plate 61. When the mounting plate 61 rotates, the lowest point of the mounting plate 61 sequentially presses against the plunger assemblies 4, causing multiple plunger assemblies 4 to work intermittently, thus making the water output of the plunger pump more stable.

[0042] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A series-wound motor driven plunger pump, comprising a housing (1) and a base (2), wherein an inlet pipe (21) and an outlet pipe (22) are provided on the base (2), characterized in that, A connector (3) is installed between the housing (1) and the base (2). The connector (3) has at least one plunger hole (31) and one water flow channel (32). A plunger assembly (4) is slidably installed in the housing (1). The plunger assembly (4) extends into the plunger hole (31). The side of the plunger hole (31) is provided with a through hole (310) that communicates with the water flow channel (32). The base (2) is provided with a water guide cavity (23) and a water tank (24). All water flow channels (32) communicate with the water guide cavity (23). The water guide cavity (23) and the water tank (24) are connected through a through hole (230). The water tank (24) communicates with the water outlet pipe (22).

2. The series-wound motor-driven plunger pump as described in claim 1, characterized in that, The connector (3) is provided with a mounting part (33) that communicates with the plunger hole (31). A first one-way valve (100) for blocking the plunger hole (31) is installed in the mounting part (33). The first one-way valve (100) is located below the perforation (310).

3. The series-wound motor-driven plunger pump as described in claim 2, characterized in that, A spring is installed on the first check valve (100), one end of which abuts against the first check valve (100) and the other end abuts against the mounting part (33).

4. The series-wound motor-driven plunger pump as described in claim 1, characterized in that, The number of plunger holes (31) is three, and the number of water flow channels (32) is the same as the number of plunger holes (31), and they correspond one-to-one; the three plunger holes (31) are evenly distributed around the central axis of the connecting body (3); the housing (1) is provided with mounting holes (11) aligned with the plunger holes (31), and the plunger assembly (4) is slidably mounted in the mounting holes (11).

5. The series-wound motor-driven plunger pump as described in claim 4, characterized in that, The plunger assembly (4) includes a plunger rod (41), a limiting piece (42), and an elastic element (43). The plunger rod (41) extends into the mounting hole (11) and the plunger hole (31) in sequence. The limiting piece (42) is fixedly installed on the plunger rod (41) at one end away from the plunger hole (31). One end of the elastic element (43) abuts against the limiting piece (42), and the other end abuts against the housing (1).

6. The series-wound motor-driven plunger pump as described in claim 1, characterized in that, A second check valve (200) is installed in the water flow channel (32), a third check valve (300) is installed in the water guide cavity (23), and a sealing block (400) for sealing the water tank (24) is installed below the water tank (24).

7. The series-wound motor-driven plunger pump as described in claim 6, characterized in that, Both the second check valve (200) and the third check valve (300) are provided with sealing structures.

8. The series-wound motor-driven plunger pump as described in claim 1, characterized in that, The base (2) is provided with an installation groove (25) that communicates with the water guide cavity (23), and a pressure relief valve assembly (5) is installed in the installation groove (25).

9. The series-wound motor-driven plunger pump as described in claim 1, characterized in that, It also includes a series motor (500), and a propulsion assembly (6) is installed inside the housing (1). The drive rod of the series motor (500) is connected to the propulsion assembly (6). The propulsion assembly (6) is used to drive the plunger assembly (4) to slide towards the base (2).

10. The series-wound motor-driven plunger pump as described in claim 9, characterized in that, The propulsion assembly (6) includes a mounting plate (61) and a drive plate (62). A gear structure is provided between the mounting plate (61) and the drive rod of the series motor (500). The drive plate (62) is fixedly mounted on the mounting plate (61) and is inclined to the mounting plate (61).

Images