Plunger pump and pesticide sprayer with same

Abstract

The utility model provides a plunger pump and a pesticide spraying machine with the plunger pump, and belongs to the technical field of agricultural equipment. The plunger pump solves the problem that in the prior art, a plunger pump of a pesticide sprayer is low in transmission efficiency. The plunger pump comprises a pump body, a liquid inlet pipe and a liquid outlet pipe, a motor is arranged on the pump body, a first cylinder body and a second cylinder body are connected to the two sides of the pump body, a plunger is arranged in the pump body, and the first cylinder body and the second cylinder body are communicated with the liquid inlet pipe and the liquid outlet pipe at the same time respectively. The first cylinder body and the second cylinder body are further provided with a liquid inlet one-way valve for controlling the first cylinder body and the second cylinder body to be communicated with the liquid inlet pipe and a liquid outlet one-way valve for controlling the first cylinder body and the second cylinder body to be communicated with the liquid outlet pipe respectively, and the two ends of the plunger extend into the first cylinder body and the second cylinder body respectively and are movably connected with the inner wall of the first cylinder body and the inner wall of the second cylinder body in a sealed mode respectively. The motor is used for driving the plunger to move back and forth between the first cylinder body and the second cylinder body. The plunger pump has the advantages that the transmission efficiency of the plunger pump of the pesticide sprayer can be improved, and meanwhile, the liquid outlet continuity is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural equipment, and relates to a plunger pump and a pesticide spraying machine with the same. Background Art

[0002] For a traditional backpack gasoline-powered pesticide spraying machine, a small gasoline engine is connected to a driven disc on the pump head through a clutch. Inside the driven disc, there are large and small gears and bearings to drive the plunger to reciprocate and suck the liquid medicine. The transmission efficiency is low, the noise of the gasoline engine is large, it pollutes the air, wastes money, and increases the burden on farmers. Summary of the Invention

[0003] The purpose of the utility model is to provide a plunger pump and a pesticide spraying machine with the same in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is how to improve the transmission efficiency of the plunger pump of the pesticide spraying machine while ensuring the continuity of liquid output.

[0004] The purpose of the utility model can be achieved by the following technical solutions:

[0005] A plunger pump, comprising a pump body, a liquid inlet pipe and a liquid outlet pipe. It is characterized in that an electric motor is arranged on the pump body, a cylinder block one and a cylinder block two are connected to both sides of the pump body, and a plunger is arranged inside the pump body. The cylinder block one and the cylinder block two are respectively and simultaneously communicated with the liquid inlet pipe and the liquid outlet pipe. An inlet check valve for controlling its communication with the liquid inlet pipe and an outlet check valve for controlling its communication with the liquid outlet pipe are respectively arranged on the cylinder block one and the cylinder block two. Both ends of the plunger respectively extend into the cylinder block one and the cylinder block two, and are movably and sealingly connected to the inner walls of the cylinder block one and the cylinder block two respectively. The electric motor is used to drive the plunger to move back and forth between the cylinder block one and the cylinder block two.

[0006] Different from the prior art, this plunger pump directly drives a plunger to move back and forth between a cylinder block one and a cylinder block two through an electric motor, directly converting electrical energy into mechanical energy of linear motion, eliminating the intermediate transmission link, with a simple structure and small friction and wear, thereby greatly improving the transmission efficiency of the plunger pump. In addition, an inlet check valve for controlling its communication with the liquid inlet pipe and an outlet check valve for controlling its communication with the liquid outlet pipe are respectively arranged on the cylinder block one and the cylinder block two. Both ends of the plunger respectively extend into the cylinder block one and the cylinder block two, and are movably and sealingly connected to the inner walls of the cylinder block one and the cylinder block two respectively. Therefore, by the movement of the plunger, the volumes inside the cylinder block one and the cylinder block two are alternately changed, realizing the function of alternately sucking and discharging liquid of the cylinder block one and the cylinder block two, thereby ensuring that the liquid outlet of the liquid outlet pipe can continuously discharge liquid during use, and further improving the transmission efficiency of the plunger pump while ensuring the continuity of liquid output.

[0007] Specifically, during operation, the motor drives the plunger in the pump body to move horizontally back and forth between cylinder block 1 and cylinder block 2. When the plunger moves towards cylinder block 1, the volume inside cylinder block 1 becomes smaller, thereby compressing the liquid medicine. The outlet check valve inside cylinder block 1 opens, allowing the compressed high-pressure liquid medicine to be discharged into the outlet pipe. At the same time, the plunger withdraws from cylinder block 2, causing the volume inside cylinder block 2 to become larger. The inlet check valve inside cylinder block 2 opens, enabling the liquid medicine to enter cylinder block 2 through the inlet pipe. Conversely, when the plunger moves towards cylinder block 2, the volume inside cylinder block 2 becomes smaller, compressing the liquid medicine. The outlet check valve inside cylinder block 2 opens, discharging the compressed high-pressure liquid medicine into the outlet pipe. At the same time, the plunger withdraws from cylinder block 1, making the volume inside cylinder block 1 larger. The inlet check valve inside cylinder block 1 opens, allowing the liquid medicine to enter cylinder block 1 through the inlet pipe. Thus, the function of alternating suction and discharge of liquid in cylinder block 1 and cylinder block 2 is achieved, ensuring continuous liquid discharge at the liquid outlet of the outlet pipe during use, thereby improving the transmission efficiency of the plunger pump and ensuring the continuity of liquid discharge.

[0008] In the above-mentioned plunger pump, a notch groove is provided in the middle of the plunger. An eccentric wheel is fixedly connected to the output shaft of the motor. The eccentric wheel is embedded in the notch groove, and there is a rotational clearance between the eccentric wheel and the groove wall of the notch groove. During use, the motor drives the eccentric wheel to rotate synchronously. Since there is only a rotational clearance between the eccentric wheel and the groove wall of the notch groove, after the eccentric wheel rotates, it can alternately push the groove walls on both sides of the notch groove to directly drive a plunger to move back and forth between cylinder block 1 and cylinder block 2 by the motor, directly converting electrical energy into mechanical energy of linear motion, eliminating the intermediate transmission link, with a simple structure and small friction and wear, thereby greatly improving the transmission efficiency of the plunger pump.

[0009] In the above-mentioned plunger pump, the eccentric wheel is fixedly connected to the output shaft of the motor through a connecting column. A bearing and a oil seal are respectively arranged between the connecting column and the inner wall of the pump body. The bearing is located between the oil seal and the eccentric wheel. The connecting column can extend the length of the motor output shaft, so as to better arrange the eccentric wheel, bearing and oil seal adjacent to each other in sequence. At the same time, it can also realize the rapid installation of components such as the bearing, and can also prevent the oil droplets in the pump body from dripping everywhere.

[0010] In the above-mentioned plunger pump, the end of the connecting column close to the motor has an installation groove. The output shaft of the motor is inserted into the installation groove and fixedly connected through a bolt passing through both of them. The above structure can realize the rapid disassembly and assembly of the motor and the connecting column, enabling this plunger pump to quickly match motors of different models.

[0011] In the above-mentioned plunger pump, the pump body is provided with a plurality of heat dissipation holes along its circumference, and the heat dissipation holes are located between the oil seal and the motor. By providing the heat dissipation holes of the above structure on the pump body, the air flow movement near the motor output shaft can be accelerated, and air cooling can be provided, which is conducive to ensuring the normal operation of the motor, thereby improving the transmission efficiency and reliability of the plunger pump.

[0012] In the above plunger pump, one end of the pump body is detachably connected to the motor, and the other end is detachably provided with an end cover, and an oil filling hole is provided on the side wall of the pump body at the bottom, and a sealing bolt is detachably provided on the oil filling hole. The above structure facilitates the addition of lubricating oil and the cleaning of the inside of the pump body.

[0013] In the above plunger pump, the motor is a brushless motor, which has the advantages of precise control, high performance, lower noise and long life.

[0014] In the above plunger pump, the motor is provided with a circuit board for controlling its rotation. Using a circuit board to control the rotation of the motor has the advantages of low noise, high efficiency, high reliability and small size. The circuit board is preferably made of an aluminum substrate, and the motor housing is preferably made of aluminum or aluminum alloy, so as to have a good heat dissipation effect.

[0015] A drug sprayer, characterized in that it comprises a medicine barrel and the above-mentioned plunger pump, a mounting seat is provided at the bottom of the medicine barrel, the plunger pump is provided on the mounting seat, a protective cover with holes is provided on the front sides of both the medicine barrel and the mounting seat, the medicine barrel also has a fixing groove, a lithium battery for providing electric energy to the motor is provided in the fixing groove. The drug sprayer of the above-mentioned structure can be carried on the back, and the cushion provided also makes it more comfortable to carry, compact and light, and more convenient to use.

[0016] In the above-mentioned sprayer, the front sides of the medicine barrel and the mounting seat are both provided with a protective cover with holes, the rear sides of the medicine barrel and the mounting seat are both provided with a cushion, the medicine barrel is also provided with a receiving groove for positioning the spray rod, and the medicine barrel is detachably provided with a fixing frame for positioning the lithium battery at the edge of the notch of the fixing groove, and the fixing frame and the fixing groove are both located in the protective cover. The protective cover can protect both the plunger pump provided on the mounting seat and the lithium battery provided in the fixing groove, and the fixing frame can prevent the lithium battery from being separated from the fixing groove, and the detachable fixing frame also facilitates the disassembly and assembly of the lithium battery, and the receiving groove can be used to position the spray rod to prevent the spray rod from being placed randomly, making it more convenient to use.

[0017] Compared with the prior art, the advantages of this plunger pump and the medicine spraying machine equipped with it are as follows: 1. This plunger pump directly drives a plunger to move back and forth between cylinder block 1 and cylinder block 2 through an electric motor, directly converting electrical energy into mechanical energy of linear motion, eliminating the intermediate transmission link, with a simple structure and small friction and wear, thus greatly improving the transmission efficiency of the plunger pump. At the same time, by the movement of the plunger, the volumes in cylinder block 1 and cylinder block 2 are alternately changed, realizing the function of alternate liquid suction and discharge of cylinder block 1 and cylinder block 2, thereby ensuring that the liquid outlet of the liquid outlet pipe can continuously discharge liquid during use, and further improving the transmission efficiency of the plunger pump while ensuring the continuity of liquid discharge.

[0018] 2. This medicine spraying machine uses a lithium battery to drive a brushless motor, and the shaft head on the motor is directly connected to the eccentric shaft in the pump head, reducing the number of components, and the spraying pressure can also achieve the same effect as that of a gasoline engine. It is noise-free and environmentally friendly. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of this plunger pump.

[0020] Figure 2 is a structural schematic diagram of the top view of this plunger pump.

[0021] Figure 3 is Figure 2 the sectional view at A-A in

[0022] Figure 4 is Figure 2 the sectional view at B-B in

[0023] Figure 5 is an exploded view of this plunger pump after removing the pump body.

[0024] Figure 6 is a structural schematic diagram of the top view of this plunger pump after removing the pump body.

[0025] Figure 7 is one of the three-dimensional structural schematic diagrams of the medicine spraying machine equipped with this plunger pump.

[0026] Figure 8 is another three-dimensional structural schematic diagram of the medicine spraying machine equipped with this plunger pump.

[0027] Figure 9 is one of the exploded views of the medicine spraying machine equipped with this plunger pump.

[0028] Figure 10 Another exploded view of the medicine spraying machine equipped with this plunger pump.

[0029] In the figure, 1 is the pump body; 1a is the heat dissipation hole; 1b is the oil injection hole; 2 is the motor; 2a is the output shaft; 3 is the first cylinder block; 4 is the second cylinder block; 5 is the plunger; 5a is the notch groove; 6 is the eccentric wheel; 7 is the sealing bolt; 8 is the connecting column; 8a is the installation groove; 9 is the bearing; 10 is the oil seal; 11 is the bolt; 12 is the end cover; 13 is the liquid inlet pipe; 14 is the liquid outlet pipe; 15 is the inlet check valve; 16 is the outlet check valve; 17 is the circuit board; 18 is the medicine barrel; 18a is the fixing groove; 18b is the accommodating groove; 19 is the mounting seat; 20 is the protective cover; 20a is the hole; 21 is the cushion; 22 is the lithium battery; 23 is the fixing frame; 24 is the ammeter; 25 is the power switch; 26 is the speed regulating switch; 27 is the charging jack. Detailed implementation manners

[0030] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0031] Embodiment 1

[0032] A plunger pump, referring to Figures 1-6 , includes a pump body 1, a liquid inlet pipe 13 and a liquid outlet pipe 14. A plurality of heat dissipation holes 1a are arranged along the circumferential direction of the pump body 1, and the heat dissipation holes 1a are located between the oil seal 10 and the motor 2; one end of the pump body 1 is detachably connected to the motor 2, and the other end thereof is detachably provided with an end cover 12. An oil injection hole 1b is opened on the side wall of the pump body 1 at the bottom, and a sealing bolt 7 is detachably arranged on the oil injection hole 1b; a motor 2 is arranged on the pump body 1, a first cylinder block 3 and a second cylinder block 4 are connected to both sides of the pump body 1, and a plunger 5 is arranged in the pump body 1. The first cylinder block 3 and the second cylinder block 4 are respectively and simultaneously communicated with the liquid inlet pipe 13 and the liquid outlet pipe 14. An inlet check valve 15 for controlling its communication with the liquid inlet pipe 13 and an outlet check valve 16 for controlling its communication with the liquid outlet pipe 14 are respectively arranged on the first cylinder block 3 and the second cylinder block 4. Both ends of the plunger 5 respectively extend into the first cylinder block 3 and the second cylinder block 4, and are movably and sealingly connected to the inner walls of the first cylinder block 3 and the second cylinder block 4 respectively. Specifically, at least one oil seal is sealingly arranged between the first cylinder block 3 and the plunger 5, and preferably two oil seals and two water seals are arranged, and the oil seals and the water seals are arranged alternately. Similarly, at least one oil seal is sealingly arranged between the second cylinder block 4 and the plunger 5, and preferably two oil seals and two water seals are arranged, and the oil seals and the water seals are arranged alternately. The motor 2 is used to drive the plunger 5 to move back and forth between the first cylinder block 3 and the second cylinder block 4.

[0033] Specifically, referring to Figures 1-6, a notch groove 5a is formed in the middle of the plunger 5. An eccentric wheel 6 is fixedly connected to the output shaft 2a of the motor 2. The eccentric wheel 6 is embedded in the notch groove 5a, and there is a rotational clearance between the eccentric wheel 6 and the groove wall of the notch groove 5a. The eccentric wheel 6 is fixedly connected to the output shaft 2a of the motor 2 through a connecting column 8. A bearing 9 and a oil seal 10 are respectively arranged between the connecting column 8 and the inner wall of the pump body 1. The bearing 9 is located between the oil seal 10 and the eccentric wheel 6. One end of the connecting column 8 close to the motor 2 has an installation groove 8a. The output shaft 2a of the motor 2 is inserted into the installation groove 8a and fixedly connected through a bolt 11 passing through both of them.

[0034] The working principle of this plunger pump is described below:

[0035] It should be noted that during use, the liquid inlet pipe is connected to the liquid medicine tank. A pressure relief valve is also provided between the liquid outlet pipe and the liquid outlet check valve. The pressure relief valve is connected to the liquid return pipe. A liquid outlet switch is provided at the liquid outlet. When the liquid outlet switch is in the closed state, the pressure relief valve is opened, so that the liquid medicine in the liquid outlet pipe returns to the liquid medicine tank through the liquid return pipe.

[0036] During operation, the motor 2 drives the plunger 5 in the pump body 1 to move horizontally back and forth between the cylinder body one 3 and the cylinder body two 4. When the plunger 5 moves towards the cylinder body one 3, the volume in the cylinder body one 3 becomes smaller, thereby compressing the liquid medicine. The liquid outlet check valve 16 in the cylinder body one 3 is opened, so that the compressed high-pressure liquid medicine is discharged into the liquid outlet pipe 14. At the same time, the plunger 5 withdraws from the cylinder body two 4, making the volume in the cylinder body two 4 become larger. The liquid inlet check valve 15 in the cylinder body two 4 is opened, and the liquid medicine can enter the cylinder body two 4 through the liquid inlet pipe 13. On the contrary, when the plunger 5 moves towards the cylinder body two 4, the volume in the cylinder body two 4 becomes smaller, thereby compressing the liquid medicine. The liquid outlet check valve 16 in the cylinder body two 4 is opened, so that the compressed high-pressure liquid medicine is discharged into the liquid outlet pipe 14. At the same time, the plunger 5 withdraws from the cylinder body one 3, making the volume in the cylinder body one 3 become larger. The liquid inlet check valve 15 in the cylinder body one 3 is opened, and the liquid medicine can enter the cylinder body one 3 through the liquid inlet pipe 13. Thus, the function of alternately sucking and discharging liquid of the cylinder body one 3 and the cylinder body two 4 is realized, ensuring that the liquid outlet of the liquid outlet pipe 14 can continuously discharge liquid during use, and further improving the transmission efficiency and use reliability of the plunger pump.

[0037] Embodiment Two:

[0038] A pesticide spraying machine, comprising a medicine barrel 18 and the plunger pump described in the first embodiment. An installation seat 19 is provided at the bottom of the medicine barrel 18, and the plunger pump is arranged on the installation seat 19. A protective cover 20 with holes 20a is jointly provided on the front sides of both the medicine barrel 18 and the installation seat 19. A cushion 21 is jointly provided on the rear sides of both the medicine barrel 18 and the installation seat 19. The medicine barrel 18 also has a fixing groove 18a and a receiving groove 18b for positioning the spray rod. A lithium battery 22 for supplying electric energy to the motor 2 is arranged in the fixing groove 18a. A fixing frame 23 for positioning the lithium battery 22 is detachably arranged at the edge of the notch of the fixing groove 18a of the medicine barrel 18. Both the fixing frame 23 and the fixing groove 18a are located inside the protective cover 20.

[0039] In this embodiment, it is preferred that the motor 2 is a brushless motor; it is preferred that a circuit board 17 for controlling its rotation is arranged on the motor 2; it is preferred that the pesticide spraying machine further includes an ammeter 24, a power switch 25, a speed regulation switch 26 and a charging jack 27.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A plunger pump, comprising a pump body (1), a liquid inlet pipe (13) and a liquid outlet pipe (14), characterized in that, A motor (2) is provided on the pump body (1). On both sides of the pump body (1), a first cylinder block (3) and a second cylinder block (4) are connected, and a plunger (5) is arranged inside the pump body (1). The first cylinder block (3) and the second cylinder block (4) are respectively and simultaneously communicated with a liquid inlet pipe (13) and a liquid outlet pipe (14). An inlet check valve (15) for controlling its communication with the liquid inlet pipe (13) and an outlet check valve (16) for controlling its communication with the liquid outlet pipe (14) are respectively arranged on the first cylinder block (3) and the second cylinder block (4). Both ends of the plunger (5) respectively extend into the first cylinder block (3) and the second cylinder block (4), and are movably and sealingly connected to the inner walls of the first cylinder block (3) and the second cylinder block (4) respectively. The motor (2) is used to drive the plunger (5) to move back and forth between the first cylinder block (3) and the second cylinder block (4).

2. A plunger pump according to claim 1, wherein, A notch groove (5a) is formed in the middle of the plunger (5). An eccentric wheel (6) is fixedly connected to the output shaft (2a) of the motor (2). The eccentric wheel (6) is embedded in the notch groove (5a), and there is a rotational clearance between the eccentric wheel (6) and the groove wall of the notch groove (5a).

3. A plunger pump according to claim 2, characterized in that, The eccentric wheel (6) is fixedly connected to the output shaft (2a) of the motor (2) through a connecting column (8). Bearings (9) and oil seals (10) are respectively arranged between the connecting column (8) and the inner wall of the pump body (1). The bearing (9) is located between the oil seal (10) and the eccentric wheel (6).

4. A plunger pump according to claim 3, characterized in that, One end of the connecting column (8) close to the motor (2) has a mounting groove (8a). The output shaft (2a) of the motor (2) is inserted into the mounting groove (8a) and fixedly connected through a bolt (11) passing through both of them.

5. A plunger pump according to claim 3, characterized in that, A plurality of heat dissipation holes (1a) are arranged along the circumferential direction of the pump body (1). The heat dissipation holes (1a) are located between the oil seal (10) and the motor (2).

6. A plunger pump according to any one of claims 1-5, characterized in that, One end of the pump body (1) is detachably connected to the motor (2), and an end cover (12) is detachably arranged at the other end. An oil injection hole (1b) is formed in the side wall of the pump body (1) at the bottom, and a sealing bolt (7) is detachably arranged on the oil injection hole (1b).

7. A plunger pump according to any one of claims 1-5, characterized in that, The motor (2) is a brushless motor.

8. A plunger pump according to any one of claims 1-5, characterized in that, A circuit board (17) for controlling its rotation is arranged on the motor (2).

9. A pesticide spraying machine, characterized in that, It includes a medicine barrel (18) and the plunger pump according to any one of claims 1-8. A mounting seat (19) is arranged at the bottom of the medicine barrel (18). The plunger pump is arranged on the mounting seat (19). A fixing groove (18a) is further provided on the medicine barrel (18). A lithium battery (22) for supplying electric energy to the motor (2) is arranged in the fixing groove (18a).

10. The pesticide spraying machine according to claim 9, characterized in that, A protective cover (20) with a hole (20a) is jointly provided on the front sides of both the medicine barrel (18) and the mounting seat (19). A cushion (21) is jointly provided on the rear sides of both the medicine barrel (18) and the mounting seat (19). The medicine barrel (18) further has a receiving groove (18b) for positioning a spray rod. A fixing bracket (23) for positioning a lithium battery (22) is detachably provided at the notch edge of the fixing groove (18a) of the medicine barrel (18). Both the fixing bracket (23) and the fixing groove (18a) are located within the protective cover (20).

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