A peristaltic impeller composite self-priming pump

Abstract

The application discloses a peristaltic impeller composite self-priming pump and relates to the technical field of non-variable volume pumps. The peristaltic impeller composite self-priming pump comprises a driving motor, a peristaltic pump part and an impeller pump part. The power output shaft of the driving motor penetrates the peristaltic pump part and the impeller pump part in sequence. The central transmission wheel of the peristaltic pump part is transmissionally coupled with the power output shaft through viscous damping grease. The end part of the power output shaft is fixedly connected with the impeller of the impeller pump part. The water suction end of the peristaltic pump part is communicated with the pump cavity of the impeller pump part, and the water outlet end of the peristaltic pump part is communicated with the water outlet pipe of the impeller pump part. The water outlet pipe of the impeller pump part is provided with a one-way valve, which is located between the water outlet end of the peristaltic pump part and the water outlet end of the impeller pump part and only allows fluid to be conducted in the water outlet direction. The peristaltic impeller composite self-priming pump combines the anti-blocking and self-priming characteristics of the peristaltic pump with the large flow and mute characteristics of the impeller pump, is a functional combination of two pump bodies and is a composite pump with complementary short boards.

Description

Technical Field

[0001] This invention relates to the field of non-variable displacement pump technology, and in particular to a self-priming pump that combines a peristaltic pump and an impeller pump. Background Technology

[0002] Self-priming pumps, as devices that draw fluid in through negative pressure, are widely used in small electrical appliances (such as water purification equipment, medical instruments, and micro-irrigation systems). Currently, the mainstream small self-priming pumps mainly fall into three technical categories, but all have significant limitations: 1. Diaphragm pump technology, currently the most commonly used type of small self-priming pump, utilizes the reciprocating motion of a diaphragm to generate negative pressure for liquid suction. However, this technology has inherent drawbacks: a. Flow rate limitation: The flow rate output efficiency per unit volume is low, and the pump body size needs to be increased or the power needs to be increased to meet the larger flow rate requirements; b. High noise and vibration: The high-frequency reciprocating motion of the diaphragm generates significant mechanical noise, making it unsuitable for quiet and sensitive scenarios (such as medical equipment); c. Risk of clogging: The narrow flow channel design has low tolerance to fluids containing particles, resulting in insufficient long-term operational reliability.

[0003] 2. Impeller pump technology, a traditional pump type with centrifugal impeller as its core, has advantages such as large flow rate, low noise and anti-clogging, but has a fatal flaw: no self-priming ability. The pump chamber needs to be manually filled with liquid before starting, and it cannot automatically draw liquid in non-submerged conditions, which greatly limits the application scenarios.

[0004] 3. Peristaltic pump technology, which achieves self-priming by squeezing a hose, has advantages such as pollution-free transmission, dry-run tolerance, and anti-clogging properties, but it also has bottlenecks: a. Extremely low flow rate: The single extrusion conveying capacity is much lower than that of diaphragm pumps and impeller pumps; b. Short lifespan: Frequent replacements are required due to hose fatigue and aging, resulting in high maintenance costs; c. Low energy efficiency: The energy conversion efficiency of mechanical extrusion is low.

[0005] This invention aims to combine the anti-clogging and self-priming functions of a peristaltic pump with the high flow rate and quiet operation of an impeller pump, and to research a composite pump that combines the functions of a peristaltic pump and an impeller pump, thus complementing each other's weaknesses. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a peristaltic impeller composite self-priming pump, which combines the anti-clogging and self-priming characteristics of a peristaltic pump with the large flow rate and quiet operation characteristics of an impeller pump. It is a composite pump that combines the functions of two pump bodies and complements each other's shortcomings.

[0007] The technical solution adopted in this invention is: a peristaltic impeller composite self-priming pump, comprising a drive motor, a peristaltic pump section, and an impeller pump section; The power output shaft of the drive motor passes through the peristaltic pump section and the impeller pump section in sequence; The central drive wheel of the peristaltic pump unit is coupled to the power output shaft via viscous damping grease. The end of the power output shaft is fixedly connected to the impeller of the impeller pump section; The suction end of the peristaltic pump is connected to the pump chamber of the impeller pump, and the discharge end of the peristaltic pump is connected to the discharge pipe of the impeller pump. The outlet pipe of the impeller pump is equipped with a one-way valve. The one-way valve is located between the outlet end of the peristaltic pump and the outlet end of the impeller pump, and only allows fluid to flow in the outlet direction.

[0008] To further optimize this technical solution, the viscous damping grease is a temperature-sensitive damping grease, whose viscosity decreases as the temperature increases. When a predetermined temperature is reached, the power output shaft and the central transmission wheel are decoupled.

[0009] To further optimize this technical solution, the one-way valve is a diaphragm-type one-way valve, including a flexible diaphragm, a shaping plate located inside the flexible diaphragm, and a connecting plate for connecting with the inner wall of the outlet pipe of the impeller pump; the connecting plate is rotatably connected to the flexible diaphragm; the flexible diaphragm is in one-way sealing fit with the inner wall of the outlet pipe of the impeller pump.

[0010] To further optimize this technical solution, the water suction end of the peristaltic pump is directly connected to the pump chamber of the impeller pump through a first fluid channel provided on the bottom shell of the impeller pump; the water suction end of the peristaltic pump is sealed and connected to the first fluid channel; the water discharge end of the peristaltic pump is directly connected to the water discharge pipe of the impeller pump through a second fluid channel provided on the impeller pump housing; the water discharge end of the peristaltic pump is sealed and connected to the second fluid channel.

[0011] To further optimize this technical solution, the power output shaft of the drive motor and the impeller pump section are rotary sealed together by a sealing gasket; the sealing gasket is installed at the center of the bottom shell of the impeller pump section.

[0012] To further optimize this technical solution, the impeller pump section and the peristaltic pump section are detachably connected by screws around the perimeter; the bottom shell of the impeller pump section is the sealing shell of the peristaltic pump section.

[0013] To further optimize this technical solution, when the drive motor starts, the peristaltic pump section works first and forms a negative pressure in the pump chamber of the impeller pump section. Liquid is drawn into the pump chamber of the impeller pump section. When the liquid in the inner chamber of the impeller pump section reaches a predetermined capacity, the fluid pressure pushes open the check valve, causing the impeller pump section to take the lead in operation. After continuous operation for a predetermined time, the viscosity of the viscous damping grease decreases due to temperature rise, and the peristaltic pump section stops working.

[0014] This invention combines the functions of a peristaltic pump and an impeller pump, and its core utilizes viscous damping grease. During the initial start-up phase, the viscous damping grease is in a low-temperature, high-damping stage, and the peristaltic pump section draws in fluid. When the fluid volume inside the impeller pump section reaches its normal operating capacity, the impeller pump section operates normally. As the temperature of the viscous damping grease rises, the power output shaft of the drive motor decouples from the central transmission wheel of the peristaltic pump section, and the peristaltic pump section ceases operation. The advantages of this are: 1. One drive motor can drive both the peristaltic pump section and the impeller pump section. After the peristaltic pump section completes the diversion work, it is decoupled from the drive motor and no longer consumes the power of the drive motor. Moreover, when the peristaltic pump section is diverting fluid, the impeller pump section will not reach its maximum load due to insufficient fluid capacity in the pump chamber. Therefore, even though this invention combines the peristaltic pump section and the impeller pump section, it does not increase the power requirement of the drive motor, so there is no need to replace it with a high-power drive motor.

[0015] 2. The coupling and decoupling of the peristaltic pump unit and the drive motor are achieved by utilizing the temperature change of the viscous damping grease during operation. The structure is simple, which leads to a higher degree of integration of the pump body structure. It is easy to implement and does not require major modifications to the peristaltic pump unit. It is only necessary to adjust the fixed connection between the central drive wheel and the power output shaft of the traditional peristaltic pump to a clearance fit filled with viscous damping grease. No additional clutch device is required.

[0016] Other technical effects of the present invention will gradually become clear as the embodiments are described. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 An explosion diagram; Figure 3 for Figure 2 A diagram from another direction; Figure 4 This is a partially enlarged schematic diagram of a diaphragm-type check valve.

[0018] In the diagram, 1. Drive motor; 1-2. Power output shaft; 2. Peristaltic pump section; 2-1. Central drive wheel; 2-2. Planetary roller; 2-3. Hose; 2-4. Peristaltic pump casing; 3. Impeller pump section; 3-1. Bottom shell; 3-2. Impeller; 3-3. Inlet end cover; 3-4. Outlet pipe; 3-5. First fluid channel; 3-6. Second fluid channel; 3-7. Sealing gasket; 4. Check valve; 4-1. Flexible diaphragm; 4-2. Shaping plate; 4-3. Connecting plate. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-4 The present invention will be further described in detail below with reference to specific embodiments.

[0020] like Figures 1-3 As shown, a peristaltic impeller composite self-priming pump includes a drive motor 1, a peristaltic pump section 2, and an impeller pump section 3; The power output shaft 1-2 of the drive motor 1 passes through the peristaltic pump section 2 and the impeller pump section 3 in sequence; The central drive wheel 2-1 of the peristaltic pump section 2 is coupled to the power output shaft 1-2 via viscous damping grease; The end of the power output shaft 1-2 is fixedly connected to the impeller 3-2 of the impeller pump section 3; The water inlet of the peristaltic pump section 2 is connected to the pump chamber of the impeller pump section 3, and the water outlet of the peristaltic pump section 2 is connected to the water outlet pipe 3-4 of the impeller pump section 3. The impeller pump section 3 has a one-way valve 4 installed in the outlet pipe 3-4. The one-way valve 4 is located between the outlet end of the peristaltic pump section 2 and the outlet end of the impeller pump section 3, and only allows fluid to flow in the outlet direction.

[0021] In this invention, the peristaltic pump unit 2 has the same structural principle as existing peristaltic pumps, including a peristaltic pump housing 2-4, a central drive wheel 2-1, planetary rollers 2-2, a flexible tube 2-3, and a sealing shell. The central drive wheel 2-1 drives the planetary rollers 2-2 to rotate, and the rotation of the planetary rollers 2-2 rolls the flexible tube 2-3 to achieve the negative pressure suction pumping function. Unlike existing peristaltic pumps, the central drive wheel 2-1 and the power output shaft 1-2 of the drive motor 1 are clearance-fitted and filled with viscous damping grease.

[0022] Regarding the function of viscous damping grease: It utilizes its own damping characteristics to enable power transmission between the central drive wheel 2-1 and the power output shaft 1-2. This power transmission uses the friction between the two and the viscous damping grease as the medium. Therefore, the rotational speeds of the central drive wheel 2-1 and the power output shaft 1-2 are not synchronized. The speed matching of the drive motor 1 is based on the normal operating speed requirements of the impeller pump section 3.

[0023] The impeller pump section 3 operates on the same principle as existing impeller pumps, including a base shell 3-1, an impeller 3-2, an inlet end cover 3-3, and an outlet pipe 3-4. The one-way valve 4 creates a sealed barrier between the outlet and suction ends of the peristaltic pump section 2. This ensures that a negative pressure is generated in the pump chamber of the impeller pump section 3 when the peristaltic pump section 2 is operating; otherwise, a loop would form between the outlet and suction ends, preventing pumping. When the fluid volume drawn into the pump chamber of the impeller pump section 3 reaches a certain level, the centrifugal force exerted by the impeller 3-2 on the fluid is sufficient to open the one-way valve 4, and the impeller pump section 3 begins normal pumping operation. Even if the peristaltic pump section 2 continues to operate at this time, it will not affect the flow rate.

[0024] In a further optimization of this embodiment, the viscous damping grease is a temperature-sensitive damping grease, whose viscosity decreases as the temperature increases. When a predetermined temperature is reached, the transmission decoupling between the power output shaft 1-2 and the central transmission wheel 2-1 is achieved.

[0025] Since the power output shaft 1-2 and the central drive wheel 2-1 of the peristaltic pump section 2 rotate asynchronously, the temperature of the viscous damping grease will increase as the working time of the peristaltic pump section 2 increases. The viscous damping grease is a temperature-sensitive damping grease. Specifically, a room temperature viscous damping grease can be selected. Its silicone oil molecules expand thermally, causing the viscosity to decrease. As the temperature continues to rise, the viscosity decreases further, the friction decreases, and the temperature range of the viscous damping grease is stable, thus decoupling the power output shaft 1-2 from the central drive wheel 2-1.

[0026] When the drive motor 1 is turned off, the viscous damping grease requires cooling time to return to room temperature; under conditions requiring frequent, short-term start-stop cycles, the viscous damping grease cannot cool down in time. However, the invention still retains its self-priming function in this situation because the one-way valve 4 prevents backflow of fluid in the impeller pump section 3. Under conditions requiring frequent, long-term start-stop cycles, water in the pump chamber of the impeller pump section 3 may be lost due to evaporation, while the peristaltic pump section 2 does not experience any cooling issues and can normally draw in fluid. Therefore, the invention can operate normally under both frequent, short-term start-stop cycles and frequent, long-term start-stop cycles.

[0027] like Figure 4 As shown, in a further optimized embodiment, the one-way valve 4 is a diaphragm-type one-way valve, including a flexible diaphragm 4-1, a shaping piece 4-2 located inside the flexible diaphragm 4-1, and a connecting piece 4-3 for connecting to the inner wall of the outlet pipe 3-4 of the impeller pump section 3; the connecting piece 4-3 is rotatably connected to the flexible diaphragm 4-1; the flexible diaphragm 4-1 is in a one-way sealing fit with the inner wall of the outlet pipe 3-4 of the impeller pump section 3.

[0028] The closer the check valve 4 is to the pump chamber of the impeller pump section 3, the closer the connection between the outlet end of the peristaltic pump section 2 and the outlet pipe 3-4 of the impeller pump section 3 is to the pump chamber of the impeller pump section 3. This results in a smaller overall size and higher integration of the device. Compared to piston check valves used in conventional water circuits, diaphragm check valves require less installation space, shorter distances, and lower opening pressures.

[0029] In a further optimized embodiment, the suction end of the peristaltic pump section 2 is directly connected to the pump chamber of the impeller pump section 3 through a first fluid channel 3-5 provided on the bottom shell 3-1 of the impeller pump section 3; the suction end of the peristaltic pump section 2 is sealed and connected to the first fluid channel 3-5; the discharge end of the peristaltic pump section 2 is directly connected to the discharge pipe 3-4 of the impeller pump section 3 through a second fluid channel 3-6 provided on the shell of the impeller pump section 3; the discharge end of the peristaltic pump section 2 is sealed and connected to the second fluid channel 3-6.

[0030] Since the hose of the impeller pump section 3 is generally made of silicone, it needs to be bent when connected to the impeller pump section 3, so a bending radius needs to be reserved, which will increase the overall size of the device. By using the bottom shell 3-1 of the impeller pump section 3 to construct the first fluid channel 3-5 and the second fluid channel 3-6, the hose bending is no longer required, which helps to improve the overall integration of the device and reduce its size.

[0031] In a further optimization of this embodiment, the power output shaft 1-2 of the drive motor 1 and the impeller pump section 3 are rotary sealed together by a sealing gasket 3-7; the sealing gasket 3-7 is installed at the center of the bottom shell 3-1 of the impeller pump section 3.

[0032] The sealing gaskets 3-7 prevent fluid from entering the inner cavity of the peristaltic pump section 2 from the impeller pump section 3. This has the advantage of preventing the organic fluid from dissolving the viscous damping grease when pumping organic fluid.

[0033] In a further optimization of this embodiment, the impeller pump section 3 and the peristaltic pump section 2 are detachably connected by screws around the perimeter; the bottom shell 3-1 of the impeller pump section 3 is the sealing shell of the peristaltic pump section 2.

[0034] The lifespan of the hose 2-3 in the peristaltic pump section 2 is limited, and the detachable connection makes it easy to replace the hose 2-3.

[0035] In a further optimized embodiment, when the drive motor 1 starts, the peristaltic pump section 2 operates first and forms a negative pressure in the pump chamber of the impeller pump section 3. Liquid is drawn into the pump chamber of the impeller pump section 3. When the liquid in the inner chamber of the impeller pump section 3 reaches a predetermined capacity, the fluid pressure pushes open the one-way valve 4, causing the impeller pump section 3 to operate in the main mode. After continuous operation for a predetermined time, the viscosity of the viscous damping grease decreases due to temperature rise, and the peristaltic pump section 2 stops operating.

[0036] The time required for the viscous damping grease to heat up to the point where the power output shaft 1-2 decouples from the central drive wheel 2-1 should be greater than the time required for the fluid pumped into the peristaltic pump section 2 to allow the impeller pump section 3 to begin normal operation. The heating time can be adjusted by controlling the area of ​​the power output shaft 1-2 exposed within the impeller pump section 3. A larger exposed area results in greater heat conduction between the power output shaft 1-2 and the fluid, leading to a slower heating of the viscous damping grease, and vice versa.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

Claims

1. A peristaltic impeller composite self-priming pump, characterized in that... It includes a drive motor, a peristaltic pump section, and an impeller pump section; The power output shaft of the drive motor passes through the peristaltic pump section and the impeller pump section in sequence; The central drive wheel of the peristaltic pump unit is coupled to the power output shaft via viscous damping grease. The end of the power output shaft is fixedly connected to the impeller of the impeller pump section; The suction end of the peristaltic pump is connected to the pump chamber of the impeller pump, and the discharge end of the peristaltic pump is connected to the discharge pipe of the impeller pump. The outlet pipe of the impeller pump is equipped with a one-way valve. The one-way valve is located between the outlet end of the peristaltic pump and the outlet end of the impeller pump, and only allows fluid to flow in the outlet direction.

2. The peristaltic impeller composite self-priming pump according to claim 1, characterized in that: The viscous damping grease is a temperature-sensitive damping grease, whose viscosity decreases as the temperature increases. When a predetermined temperature is reached, the power output shaft and the central drive wheel are decoupled.

3. The peristaltic impeller composite self-priming pump according to claim 1, characterized in that: The one-way valve is a diaphragm-type one-way valve, including a flexible diaphragm, a shaping plate located inside the flexible diaphragm, and a connecting plate for connecting to the inner wall of the outlet pipe of the impeller pump; the connecting plate is rotatably connected to the flexible diaphragm; the flexible diaphragm is in one-way sealing fit with the inner wall of the outlet pipe of the impeller pump.

4. The peristaltic impeller composite self-priming pump according to claim 1, characterized in that: The suction end of the peristaltic pump is directly connected to the pump chamber of the impeller pump through a first fluid channel provided on the bottom shell of the impeller pump; the suction end of the peristaltic pump is sealed and connected to the first fluid channel; the discharge end of the peristaltic pump is directly connected to the discharge pipe of the impeller pump through a second fluid channel provided on the impeller pump housing; the discharge end of the peristaltic pump is sealed and connected to the second fluid channel.

5. A peristaltic impeller composite self-priming pump according to claim 1, characterized in that: The power output shaft of the drive motor and the impeller pump are rotary sealed together by a sealing gasket; the sealing gasket is installed at the center of the bottom shell of the impeller pump.

6. The peristaltic impeller composite self-priming pump according to claim 1, characterized in that: The impeller pump section and the peristaltic pump section are detachably connected by screws around the perimeter; the bottom shell of the impeller pump section is the sealing shell of the peristaltic pump section.

7. A peristaltic impeller composite self-priming pump according to any one of claims 1-6, characterized in that: When the drive motor starts, the peristaltic pump section works first and forms a negative pressure in the pump chamber of the impeller pump section. Liquid is drawn into the pump chamber of the impeller pump section. When the liquid in the inner chamber of the impeller pump section reaches a predetermined capacity, the fluid pressure pushes open the check valve, allowing the impeller pump section to take the lead in operation. After continuous operation for a predetermined time, the viscosity of the viscous damping grease decreases due to temperature rise, and the peristaltic pump section stops working.

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