Efficient backwater booster type single-plunger reciprocating pump for backpack type spraying machine

Abstract

The invention provides an efficient backwater booster-type single-plunger reciprocating pump for a backpack sprayer, which comprises a plunger pump body and a booster turbine, the booster turbine is arranged at one end of the plunger pump body and comprises an outer shell, a volute chamber located in the shell, a turbine impeller and an auxiliary impeller, and the turbine impeller and the auxiliary impeller are located in the volute chamber. The output end of the auxiliary motor is connected with a driving gear in the volute chamber; the booster turbine is arranged at the liquid inlet port of the pump body, the turbine impeller in the booster turbine rotates at a high speed in the radial direction under the action of backwater, vacuum suction force is generated at the pump water inlet of the volute pump water inlet chamber, and natural water suction is changed into dynamic water suction; an auxiliary gear is arranged on the auxiliary impeller, the auxiliary impeller is in linkage with the booster turbine through the auxiliary gear and the driven gear, return water from the water return pipe firstly drives the auxiliary impeller small in weight and size, the turbine impeller is driven through the auxiliary impeller, and the auxiliary turbine impeller rotates rapidly.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps and relates to a high-efficiency water return pressurization single-plunger reciprocating pump for a backpack sprayer. Background Art

[0002] A plunger pump is a type of water pump. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve liquid suction and liquid pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. Therefore, it is often used in hydraulic systems. It has been widely used in the agricultural plant protection and cleaning machine industries, especially in backpack sprayers. However, due to its short stroke and poor self-priming performance, the application of large flow pumps is limited. For example, when used in a sprayer, the spray gun spray hole, that is, the spray volume, is limited. The diameter of the spray hole is 6.00mm, the spray volume is 37L / min, and the spray volume with two spray guns is only 74L / min. The pump flow of conventional plunger pumps is mostly 120-150L / min, and the excess water is mostly used for return water stirring. Theoretically, nearly 40%-50% of the flow and power are wasted. Compared with the piston pump: the volumetric efficiency of the piston pump can reach 93%-96%, while the plunger pump is only 78%-80%; how to utilize the power of the return water in the piston pump is the direction that various research institutions and enterprises in the industry have been working hard for many years.

[0003] Application No. 201911037222.X provides a plunger pump, which belongs to the technical field of pump equipment, and solves the technical problems of low efficiency of existing plunger pumps at large suction strokes. The plunger pump includes a pump body, which has a pump water inlet chamber; a suction turbine is fixedly connected to one end of the pump body, and the suction turbine is located at the pump water inlet of the pump water inlet chamber. The suction turbine includes a shell, a vortex chamber located in the shell, and a turbine impeller located in the vortex chamber; the vortex chamber is respectively provided with a total water inlet, a return water inlet, and a water outlet connected to the pump water inlet of the pump water inlet chamber, the return water inlet is connected to the return water outlet on the pump body through a return water pipe, and the return water entering the return water inlet can drive the turbine impeller to rotate. In this technical solution, by setting the suction turbine, the turbine impeller generates radial high-speed rotation under the action of the return water, thereby generating vacuum suction at the pump water inlet of the vortex pump water inlet chamber, changing natural water suction to dynamic water suction, so as to improve the pump volumetric efficiency and total efficiency of the plunger pump.

[0004] Although the above structure can improve the efficiency of the plunger pump through return water, it is very dependent on the recovery function when driving the turbine impeller to rotate through return water. In particular, the turbine impeller is relatively large in size and is made of metal. It is not easy to drive the turbine balance through return water, especially in the initial drive when the turbine balance is in a stationary state. Therefore, improvements need to be made to this problem. Summary of the invention

[0005] The object of the present invention is to provide a high-efficiency water return and pressure-boosting single-plunger reciprocating pump for a backpack sprayer, so as to solve the problems raised in the above-mentioned background technology.

[0006] The object of the present invention can be achieved through the following technical solutions: a high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, comprising a plunger pump body and a booster turbine, a base is arranged at the bottom of the plunger pump body, a pump motor is arranged at one end of the plunger pump body, a booster turbine is arranged at the other end of the plunger pump body, and the booster turbine is located at the pump body liquid inlet port of the plunger pump body, the booster turbine comprises an outer shell, a vortex chamber located in the shell, and a turbine impeller and an auxiliary impeller located inside the vortex chamber, and the auxiliary impeller is arranged on one side of the top of the turbine impeller, an auxiliary motor is arranged on the top side of the outer shell, the output end of the auxiliary motor is connected to the driving gear inside the vortex chamber, and the top and bottom of the vortex chamber are respectively A return water joint and a total water inlet are provided, and the return water joint is connected to the return water port provided at one end of the plunger pump body through return water pipe 1 and return water pipe 2, and the return water entering the return water pipe 1 and return water pipe 2 can respectively drive the auxiliary impeller and the turbine impeller to rotate, and the return water port is connected to the pump body liquid outlet port provided at the end position of the plunger pump body, the blades on the turbine impeller are arc-shaped and bent in the direction of rotation of the turbine impeller, and the turbine impeller and the auxiliary impeller are both existing disclosed impeller structures, which will not be elaborated in detail. The driven gear, auxiliary gear and driving gear of the present application are all standard gear parts, and the driven gear, auxiliary gear and driving gear are all stainless steel structures with strong corrosion resistance, and the outer walls are coated with anti-rust coating to further improve their service life.

[0007] In the above-mentioned high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, a turbine outlet is provided at the side of the booster turbine, a pump body inlet port is provided at one end of the plunger pump body, and the pump body inlet port is connected to the turbine outlet.

[0008] In the above-mentioned high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, valves are provided in the middle of the water return pipe 1 and the water return pipe 2, a three-way valve is installed on one side of the water return port, and the water return pipe 1 and the water return pipe 2 are respectively connected to the two valve ports of the three-way valve.

[0009] In the above-mentioned high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, a guide seat is arranged on the top of the booster turbine, and the guide seat is arranged between the water return joint and the outer shell. A liquid guide channel 1 and a liquid guide channel 2 are opened inside the guide seat, and the water return joint is connected to the liquid guide channel 1 and the liquid guide channel 2.

[0010] In the above-mentioned high-efficiency return-boosting single-plunger reciprocating pump for a backpack sprayer, guides are provided at the top of the turbine impeller and the top of the auxiliary impeller, an upper supporting column is provided at the middle of the top end of the guide, and the top end of the upper supporting column is movably connected to a bearing seat provided at the top end of the vortex chamber.

[0011] In the above-mentioned high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, a guide channel is provided inside the guide, and a plurality of guide spray holes facing the turbine impeller and the auxiliary impeller blades are provided on the side wall of the guide channel.

[0012] In the above-mentioned high-efficiency water return booster type single-plunger reciprocating pump for a backpack sprayer, a lower supporting column is provided in the middle of the bottom end of the turbine impeller, and the bottom end of the lower supporting column is movably connected to the bottom of the vortex chamber through a bearing.

[0013] In the above-mentioned high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, a driven gear is provided on the top of the turbine impeller, an auxiliary gear is provided on the top of the auxiliary impeller, the side of the driving gear is meshed and connected with the auxiliary gear, and one side of the auxiliary gear is meshed and connected with the driven gear.

[0014] Compared with the prior art, the advantages of the high-efficiency water return booster single plunger reciprocating pump for a backpack sprayer of the present invention are: 1. The present application provides a booster turbine at the liquid inlet port of the pump body of the plunger pump, and the turbine impeller inside the booster turbine can generate radial high-speed rotation under the action of return water, thereby generating vacuum suction at the pump inlet of the vortex pump inlet chamber, changing natural water suction into dynamic water suction, so as to improve the pump volumetric efficiency and overall efficiency of the plunger pump.

[0015] 2. The present application also provides an auxiliary impeller inside the boost turbine, and the auxiliary impeller is provided with an auxiliary gear. The auxiliary impeller is linked with the boost turbine through the auxiliary gear and the driven gear. The return water from the return pipe first drives the auxiliary impeller with smaller weight and volume, and then drives the turbine impeller through the auxiliary impeller, thereby assisting the turbine impeller to rotate quickly.

[0016] 3. The present application also provides a driving gear driven by an auxiliary motor on one side of the auxiliary impeller. The driving gear drives the turbine impeller to rotate through the auxiliary gear and the driven gear. In this way, the initial rotation of the turbine impeller is smoother, and the rotation of the turbine impeller can be maintained by the return water inside the return pipe. The above structure can effectively improve the water intake efficiency of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a structural schematic diagram of a high-efficiency water return pressurized single-plunger reciprocating pump for a backpack sprayer.

[0018] Figure 2 The present invention is a schematic diagram of the external structure of a booster turbine of a high-efficiency water return booster type single plunger reciprocating pump for a backpack sprayer.

[0019] Figure 3 The invention discloses a schematic diagram of the internal structure of a booster turbine of a high-efficiency water return booster type single plunger reciprocating pump for a backpack sprayer.

[0020] Figure 4 The invention discloses an enlarged structural diagram of a driving gear of a high-efficiency water return pressurizing single plunger reciprocating pump for a backpack sprayer.

[0021] Figure 5 The invention discloses a schematic diagram of a driving structure of a driving rod gear connection of a high-efficiency water return pressurizing single plunger reciprocating pump for a backpack sprayer.

[0022] Figure 6 The present invention is a schematic diagram of the turbine impeller structure of a high-efficiency water return pressurization type single plunger reciprocating pump for a backpack sprayer.

[0023] In the figure, 1, plunger pump body; 2, base; 3, pump motor; 4, pump outlet port; 5, return port; 6, three-way valve; 7, return pipe 1; 8, return pipe 2; 9, valve; 10, booster turbine; 11, auxiliary motor; 12, return joint; 13, pump inlet port; 14, turbine outlet; 15, guide seat; 16, main water inlet; 17, guide channel 1; 18, guide channel 2; 19, turbine impeller; 20, auxiliary impeller; 21, driving gear; 22, auxiliary gear; 23, driven gear; 24, guide; 25, guide channel; 26, guide nozzle; 27, upper support column; 28, bearing seat; 29, lower support column; 30, vortex chamber. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] A high-efficiency water-returning boosting single-plunger reciprocating pump for a backpack sprayer, comprising a plunger pump body 1 and a booster turbine 10, wherein a base 2 is arranged at the bottom of the plunger pump body 1, a pump motor 3 is arranged at one end of the plunger pump body 1, and a booster turbine 10 is arranged at the other end of the plunger pump body 1, and the booster turbine 10 is located at a pump body liquid inlet port 13 of the plunger pump body 1, and the booster turbine 10 comprises an outer shell, a vortex chamber 30 located in the shell, and a turbine impeller 19 and an auxiliary impeller 20 located inside the vortex chamber 30, and the auxiliary impeller 20 is arranged on one side of the top of the turbine impeller 19, an auxiliary motor 11 is arranged on the top side of the outer shell, and the output end of the auxiliary motor 11 is connected to a driving gear 21 inside the vortex chamber 30, and a water return joint 12 and a total water inlet 16 are respectively arranged at the top and bottom of the vortex chamber 30. The return water joint 12 is connected to the return water port 5 set at one end of the plunger pump body 1 through the return water pipe 1 7 and the return water pipe 2 8, and the return water entering the return water pipe 1 7 and the return water pipe 2 8 can respectively drive the auxiliary impeller 20 and the turbine impeller 19 to rotate, and the return water port 5 is connected to the pump body liquid outlet port 4 set at the end position of the plunger pump body 1, the blades on the turbine impeller 19 are arc-shaped and bent in the rotation direction of the turbine impeller 19, and the turbine impeller 19 and the auxiliary impeller 20 are both existing disclosed impeller structures, which will not be elaborated in detail. The driven gear 23, auxiliary gear 22 and driving gear 21 of this application are all standard gear parts, and the driven gear 23, auxiliary gear 22 and driving gear 21 are all stainless steel structures with strong corrosion resistance, and the outer walls are coated with anti-rust coating to further improve their service life.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention is a high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer. Specifically, a turbine outlet 14 is provided at the side position of the booster turbine 10, and a pump body liquid inlet port 13 is provided at one end of the plunger pump body 1, and the pump body liquid inlet port 13 is connected to the turbine outlet 14. The pump body structure of the present application first takes in water through the total water inlet 16, and the turbine impeller 19 rotates under the drive of the return water, thereby increasing the liquid discharge speed of the turbine outlet 14, improving the self-priming ability of the pump body liquid inlet port 13, and improving the liquid intake efficiency of the pump body.

[0027] like Figure 1 , Figure 2 , Figure 3As shown, the present invention is a high-efficiency return water boosting single-plunger reciprocating pump for a backpack sprayer. Specifically, a valve 9 is provided at the middle position of the return water pipe 1 7 and the return water pipe 2 8, a three-way valve 6 is installed on one side of the return water port 5, and the return water pipe 1 7 and the return water pipe 2 8 are respectively connected to the two valve ports of the three-way valve 6. The valve 9 of the present application is an electromagnetic valve 9, and can also be a manual valve 9. The return water size and return water pressure inside the return water pipe 1 7 and the return water pipe 2 8 can be adjusted by controlling the opening and closing of the valve 9. In the early stage of return water, the return water can be mainly introduced into the return water pipe 1 7, and the auxiliary impeller 20 is driven first, and the turbine impeller 19 is driven to rotate by the auxiliary impeller 20 to provide an initial speed for the turbine impeller 19. When the turbine impeller 19 rotates, the valve 9 on the return water pipe 1 7 is then adjusted down, and the valve 9 on the return water pipe 2 8 is opened wide to introduce most of the return water into the return water pipe 2 8, so that the return water directly drives the turbine impeller 19 to rotate.

[0028] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the present invention is a high-efficiency return water boosting single-plunger reciprocating pump for a backpack sprayer. Specifically, a guide seat 15 is provided on the top of the booster turbine 10, and the guide seat 15 is arranged between the return water joint 12 and the outer shell. A liquid guide channel 1 17 and a liquid guide channel 2 18 are opened inside the guide seat 15. The return water joint 12 and the liquid guide channel 1 17 and the liquid guide channel 2 18 are connected. The top of the liquid guide channel 17 and the liquid guide channel 2 18 of the present application are connected to the return water joint 12, and the bottom thereof is connected to the auxiliary impeller 20 and the turbine impeller 19 respectively, and the return water is respectively introduced into the guide 24 of the auxiliary impeller 20 and the turbine impeller 19.

[0029] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a high-efficiency return water booster type single-plunger reciprocating pump for a backpack sprayer. Specifically, the top of the turbine impeller 19 and the top of the auxiliary impeller 20 are both provided with a guide 24, and an upper support column 27 is provided in the middle of the top of the guide 24, and the top of the upper support column 27 is movably connected to a bearing seat 28 provided at the top of the vortex chamber 30. The guide 24 and the upper support column 27 are both made of metal material. The guide 24 mainly plays the role of returning water to guide the return water to the impeller.

[0030] like Figure 1 , Figure 3 , Figure 5 and Figure 6As shown, the present invention is a high-efficiency return water booster type single-plunger reciprocating pump for a backpack sprayer. Specifically, a guide channel 25 is opened inside the guide 24, and a plurality of guide spray holes 26 facing the turbine impeller 19 and the auxiliary impeller 20 blades are opened on the side wall of the guide channel 25. In the present application, the inner walls of the guide channel 25 and the guide spray holes 26 are spiral linear, so that the maximum rotation speed can be obtained under the drive of the return water pressure, the impact force on the blades is increased, thereby increasing the speed of the turbine impeller 19 and improving the self-priming ability of the pump.

[0031] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the present invention is a high-efficiency return water booster single-plunger reciprocating pump for a backpack sprayer. Specifically, a lower support column 29 is provided in the middle of the bottom end of the turbine impeller 19, and the bottom end of the lower support column 29 is movably connected to the bottom of the vortex chamber 30 through a bearing. The bottom of the turbine impeller 19 is movably supported by the lower support column 29. The lower support column 29 is a metal structure and is supported at the bottom position of the vortex chamber 30.

[0032] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a high-efficiency return water booster single-plunger reciprocating pump for a backpack sprayer. Specifically, a driven gear 23 is provided on the top of the turbine impeller 19, and an auxiliary gear 22 is provided on the top of the auxiliary impeller 20. The side of the driving gear 21 is meshed and connected with the auxiliary gear 22, and one side of the auxiliary gear 22 is meshed and connected with the driven gear 23. The driven gear 23, the auxiliary gear 22 and the driving gear 21 of the present application are all standard gear parts, and the three gears are meshed with each other. The specific working principle is as follows: the auxiliary motor 11 is first driven, so that the driving gear 21 drives the turbine impeller 19 to rotate through the auxiliary gear 22 and the driven gear 23. In this way, the initial rotation of the turbine impeller 19 is smoother, and then the rotation of the turbine impeller 19 can be maintained by the return water inside the return water pipe.

[0033] The present invention discloses a high-efficiency water return pressurizing single-plunger reciprocating pump for a backpack sprayer. The plunger pump structure in the present application is used in the field of plant protection machinery in the agricultural machinery industry, and is mainly used in backpack sprayers. It can improve the spray efficiency of the sprayer plunger pump. During processing, the liquid inside the water tank enters the vortex chamber 30 through the total water inlet 16, and is discharged through the turbine outlet 14 on one side of the vortex chamber 30, and the liquid is discharged into the plunger pump body 1. After being pressurized by the plunger pump body 1, the spray liquid is mainly discharged through the pump body outlet port 4, and part of the liquid is separated and flows to the water return port 5, and a three-way valve 6 is added, so that the spray liquid inside the water return port 5 is respectively connected to the water return pipe 1 7 and the water return pipe 2 8, and the water return size can be controlled by the valve 9. The water pipe 1 7 and the return pipe 2 8 are connected to the guide seat 15 through the return joint 12, and flow into the liquid guide channel 1 17 and the liquid guide channel 2 18 respectively. Then the liquid in the liquid guide channel 1 17 and the liquid guide channel 2 18 flows into the auxiliary impeller 20 and the turbine impeller 19 again. The auxiliary impeller 20 and the turbine impeller 19 of the present application have the same overall structure. The tops of the auxiliary impellers are both provided with guides 24, and both are movably supported by the upper support column 27. The bottom of the turbine impeller 19 is also supported separately. The auxiliary impeller 20 has a small overall volume and a light weight, and only needs to be supported at the top. The return liquid in the liquid guide channel 17 and the liquid guide channel 2 18 enters the guide. 24, and then ejected through the guide nozzle 26, thereby driving the auxiliary impeller 20 and the turbine impeller 19 to rotate. Since the auxiliary impeller 20 is small in size and light in weight, it requires less initial power, and can be driven to rotate the auxiliary impeller 20 by the return water. When the auxiliary impeller 20 rotates, the auxiliary gear 22 at the top of the auxiliary impeller 20 is meshed with the driven gear 23 at the top of the turbine impeller 19. Therefore, the auxiliary impeller 20 can drive the turbine impeller 19 to rotate, providing an initial kinetic energy for the turbine impeller 19. When the turbine impeller 19 has an initial speed, it is relatively simple to rotate, and the subsequent rotation only needs to be powered by the return water. The present application is also provided with an auxiliary motor 11 and a driving gear 21. When the return water inside the return pipe 1 7 and the return pipe 2 8 is small, the auxiliary motor 11 can be used to drive them first. In this way, the driving gear 21 drives the turbine impeller 19 to rotate through the auxiliary gear 22 and the driven gear 23. In this way, the initial rotation of the turbine impeller 19 is smoother, and the rotation of the turbine impeller 19 can be maintained by the return water inside the return pipe. Under the action of the return water, the turbine impeller 19 generates radial high-speed rotation, thereby generating and increasing vacuum suction at the turbine outlet 14 of the vortex chamber 30, changing natural water suction to dynamic water suction, so as to improve the pump volumetric efficiency and overall efficiency of the plunger pump.

[0034] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in the field. The specific embodiments described herein are merely examples of the spirit of the present invention. The technical personnel in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer, comprising a plunger pump body (1) and a booster turbine (10), characterized in that: A base (2) is provided at the bottom of the plunger pump body (1), a pump motor (3) is provided at one end of the plunger pump body (1), a booster turbine (10) is provided at the other end of the plunger pump body (1), and the booster turbine (10) is located at a pump body liquid inlet port (13) of the plunger pump body (1), the booster turbine (10) comprises an outer shell, a vortex chamber (30) located in the shell, a turbine impeller (19) located inside the vortex chamber (30), and an auxiliary impeller (20), and the auxiliary impeller (20) is provided on one side of the top of the turbine impeller (19), and the top side of the outer shell is provided with an auxiliary motor (10). 1), the output end of the auxiliary motor (11) is connected to the driving gear (21) inside the vortex chamber (30), and the top and bottom of the vortex chamber (30) are respectively provided with a return water joint (12) and a total water inlet (16), and the return water joint (12) is connected to the return water port (5) provided at one end of the plunger pump body (1) through a return water pipe 1 (7) and a return water pipe 2 (8), and the return water entering the return water pipe 1 (7) and the return water pipe 2 (8) can respectively drive the auxiliary impeller (20) and the turbine impeller (19) to rotate, and the return water port (5) is connected to the pump body liquid outlet port (4) provided at the end position of the plunger pump body (1).

2. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 1, characterized in that: A turbine liquid outlet (14) is provided at the side of the booster turbine (10), a pump body liquid inlet port (13) is provided at one end of the plunger pump body (1), and the pump body liquid inlet port (13) is connected to the turbine liquid outlet (14).

3. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 1, characterized in that: A valve (9) is provided at the middle of the water return pipe 1 (7) and the water return pipe 2 (8), a three-way valve (6) is installed on one side of the water return port (5), and the water return pipe 1 (7) and the water return pipe 2 (8) are respectively connected to the two valve ports of the three-way valve (6).

4. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 1, characterized in that: A flow guide seat (15) is arranged on the top of the boost turbine (10), and the flow guide seat (15) is arranged between the return water joint (12) and the outer shell, and a first liquid guide channel (17) and a second liquid guide channel (18) are provided inside the flow guide seat (15), and the return water joint (12) is connected to the first liquid guide channel (17) and the second liquid guide channel (18).

5. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 1, characterized in that: A guide (24) is provided at the top of the turbine impeller (19) and the top of the auxiliary impeller (20), an upper support column (27) is provided at the middle of the top of the guide (24), and the top of the upper support column (27) is movably connected to a bearing seat (28) provided at the top of the vortex chamber (30).

6. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 5, characterized in that: A flow guide channel (25) is provided inside the guide (24), and a plurality of flow guide spray holes (26) facing the blades of the turbine impeller (19) and the auxiliary impeller (20) are provided on the side wall of the flow guide channel (25).

7. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 6, characterized in that: A lower support column (29) is provided in the middle of the bottom end of the turbine impeller (19), and the bottom end of the lower support column (29) is movably connected to the bottom of the vortex chamber (30) via a bearing.

8. A high-efficiency water return booster single-plunger reciprocating pump for a backpack sprayer according to claim 7, characterized in that: A driven gear (23) is arranged at the top of the turbine impeller (19), an auxiliary gear (22) is arranged at the top of the auxiliary impeller (20), a side of the driving gear (21) is meshedly connected with the auxiliary gear (22), and a side of the auxiliary gear (22) is meshedly connected with the driven gear (23).

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