阅读说明：本技术 一种柱塞泵 (Plunger pump ) 是由 阮吉分 于 2020-12-28 设计创作，主要内容包括：本申请涉及一种柱塞泵,包括柱塞泵主体,柱塞泵主体设有挤压腔、进水通道以及出水通道,挤压腔内壁滑动设有柱塞,柱塞泵主体设有出水管,柱塞泵主体设有主驱动组件,主驱动组件包括驱动杆、驱动轮,柱塞泵主体设有从动轮,驱动轮设有啮合齿一,从动轮设有啮合齿二,从动轮设有从动杆,转轴设有副驱动组件,驱动轮、柱塞均设有铰接件,驱动杆设有穿孔,铰接件设有限位部,柱塞泵主体具有进水件。多个挤压腔的设置使本柱塞泵的供水量大大提高,通过对称设置挤压腔、柱塞、驱动轮,使柱塞泵的供水量更加稳定,减少出水量的波动；通过对称设置主驱动组件、副驱动组件以及柱塞泵主体,使本柱塞泵运行时受力更加稳定。(The utility model relates to a plunger pump, including the plunger pump main part, the plunger pump main part is equipped with the extrusion chamber, water inlet channel and water outlet channel, the sliding of extrusion intracavity wall is equipped with the plunger, the plunger pump main part is equipped with the outlet pipe, the plunger pump main part is equipped with the main drive subassembly, the main drive subassembly includes the actuating lever, the drive wheel, the plunger pump main part is equipped with from the driving wheel, the drive wheel is equipped with meshing tooth one, be equipped with meshing tooth two from the driving wheel, be equipped with the driven lever from the driving wheel, the pivot is equipped with vice drive assembly, the drive wheel, the plunger all is equipped with the articulated elements, the actuating lever is equipped with the. The arrangement of the extrusion cavities greatly improves the water supply amount of the plunger pump, and the extrusion cavities, the plungers and the driving wheels are symmetrically arranged, so that the water supply amount of the plunger pump is more stable, and the fluctuation of water yield is reduced; the main driving assembly, the auxiliary driving assembly and the plunger pump main body are symmetrically arranged, so that the plunger pump is more stable in stress during operation.)

1. The utility model provides a plunger pump, includes plunger pump main part (1), plunger pump main part (1) is equipped with extrusion chamber (11), inhalant canal (12) and exhalant canal (13), inhalant canal (12), exhalant canal (13) all extrude chamber (11) intercommunication, all be provided with check valve (14) in inhalant canal (12) and exhalant canal (13), extrusion chamber (11) inner wall slides and is equipped with plunger (15), its characterized in that: extrusion chamber (11) symmetry is equipped with two sets ofly, plunger pump main part (1) is equipped with outlet pipe (132) that communicates every extrusion chamber (11) play water passageway (13), plunger (15) correspond extrusion chamber (11) symmetry and are equipped with two sets ofly, plunger pump main part (1) is equipped with drive plunger (15) reciprocating motion's main drive subassembly (2), main drive subassembly (2) include actuating lever (21), by actuating mechanism (4) drive pivoted drive wheel (22) of setting on plunger pump main part (1), drive wheel (22) are located between two sets of extrusion chambers (11), the axis of drive wheel (22) is perpendicular with the axis of plunger (15), drive wheel (22) correspond plunger (15) and are provided with a plurality ofly, the both ends of actuating lever (21) are articulated with the surface that extrusion chamber (11) was kept away from respectively to plunger (15) tip, drive wheel (22), articulated shafts at two ends of the driving rod (21) are parallel, and the driving rods (21) on the two symmetrical plungers (15) are hinged to one point deviated from the circle center on the surface of the driving wheel (22).

2. A plunger pump according to claim 1, characterized in that: the number of each group of the extrusion cavities (11) is more than one, and the angles formed by the hinged points of the two driving wheels (22) at the end parts and the driving rods (21) on the two adjacent driving wheels (22) and two straight lines formed by the circle centers of the driving wheels (22) are the same.

3. A plunger pump according to claim 2, characterized in that: plunger pump main part (1) is equipped with the shape and follows driving wheel (22) the same from driving wheel (23), the week side surface of driving wheel (22) is equipped with meshing tooth (24), week side surface from driving wheel (23) is equipped with meshing tooth two (25), meshing tooth one (24) and meshing tooth two (25) meshing, follow driving wheel (23) surface and be equipped with driven lever (26), the both ends of driven lever (26) are articulated with surface, plunger (15) from driving wheel (23) respectively, the articulated shaft of driven lever (26) and the articulated shaft of actuating lever (21) are about the axis symmetry of plunger (15).

4. A plunger pump according to claim 3, characterized in that: the driven wheel (23) is meshed with two adjacent driving wheels (22) through a second meshing gear (25).

5. A plunger pump according to claim 4, characterized in that: the coaxial pivot (27) that is equipped with of drive wheel (22), the tip that drive wheel (22) were kept away from in pivot (27) is provided with vice drive assembly (3), the structure of vice drive assembly (3) is the same with main drive assembly (2), extrusion chamber (11) and plunger (15) correspond vice drive assembly (3) and have additionally increased two sets ofly.

6. A plunger pump according to claim 4, characterized in that: the auxiliary driving assembly (3) and the main driving assembly (2) are symmetrically distributed about the same vertical plane, and the plunger pump main body (1) is also symmetrical about the vertical plane.

7. A plunger pump according to claim 1, characterized in that: drive wheel (22), plunger (15) all are equipped with articulated elements (28), drive lever (21) are equipped with the perforation that supplies articulated elements (28) to pass, articulated elements (28) are equipped with and are used for deviating from spacing portion (281) that the surface of drive wheel (22) offseted with drive lever (21), articulated elements (28) and drive wheel (22) (plunger (15)) threaded connection.

8. A plunger pump according to claim 1, characterized in that: plunger pump main part (1) has into water spare (121), it is equipped with the intake antrum to advance water spare (121), each inhalant canal (12) all communicates with the intake antrum, it is equipped with the water inlet port that is used for connecting outside water pipe to advance water spare (121).

9. A plunger pump according to claim 8, characterized in that: the water inlet piece (121) is detachably connected with the plunger pump main body (1).

Technical Field

The application relates to the technical field of water pumps, in particular to a plunger pump.

Background

The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships.

The existing plunger pump generally drives a plunger to reciprocate through a motor to extrude water in a containing cavity so as to extrude the water out of the containing cavity.

In view of the above-mentioned related technologies, the inventor thinks that because the plunger has a movement period, when retracting, the water body cannot be extruded out of the cavity, and the supply of the water body is interrupted, resulting in unstable water supply flow, large water outlet fluctuation, and the defect that stable water supply cannot be satisfied exists.

Disclosure of Invention

In order to stabilize the water supply and reduce the fluctuation of the water yield, the application provides a plunger pump.

The application provides a plunger pump adopts following technical scheme:

the utility model provides a plunger pump, includes the plunger pump main part, the plunger pump main part is equipped with extrusion chamber, water inlet channel and water outlet channel, water inlet channel, water outlet channel all extrude the chamber intercommunication, all be provided with the check valve in water inlet channel and the water outlet channel, extrusion intracavity wall slides and is equipped with the plunger, extrusion chamber symmetry is equipped with two sets ofly, the plunger pump main part is equipped with the outlet pipe that communicates every extrusion chamber water outlet channel, the plunger corresponds extrusion chamber symmetry and is equipped with two sets ofly, the plunger pump main part is equipped with drive plunger reciprocating motion's main drive subassembly, main drive subassembly includes the actuating lever, drives pivoted drive wheel by the actuating mechanism that sets up in the plunger pump main part, the drive wheel is located between two sets of extrusion chambers, the axis of drive wheel is perpendicular with the axis of plunger, the drive wheel corresponds the plunger and is provided with a plurality ofly, the tip, the both ends of actuating lever are, The surface of the driving wheel is hinged, hinged shafts at two ends of the driving rod are parallel, and the two driving rods which are symmetrical to each other on the plunger piston are hinged to a point which deviates from the circle center on the surface of the driving wheel.

Through adopting above-mentioned technical scheme, after the drive wheel rotates, the drive wheel can drive the actuating lever simultaneous movement on the plunger of two mutual symmetries simultaneously, promote the plunger, because two actuating levers articulate on the same point of drive wheel, so when the drive wheel rotates, the opposite condition of two actuating lever motion position must appear, so all can have the plunger to push extrusion chamber at every moment, through going out water piping connection, the rivers that make extrusion chamber converge in the outlet pipe, supplement each other, thereby make this plunger pump water output more stable, it is undulant to reduce the water output.

Preferably, the number of each group of extrusion cavities is more than one, and the angles formed by the hinged points of the driving rods on the two driving wheels at the end parts and the two adjacent driving wheels and two straight lines connected with the circle centers of the driving wheels are the same.

By adopting the technical scheme, the water yield of the plunger pump is larger due to the arrangement of the extrusion cavities, and the water yield of each plunger is supplemented and maintained in a stable range because the motion state of each plunger is positioned in different stages of the motion period of the plunger, so that the fluctuation of the water supply amount is reduced.

Preferably, the plunger pump main part is equipped with the shape and the same from the driving wheel, the week side surface of driving wheel is equipped with meshing tooth one, week side surface from the driving wheel is equipped with meshing tooth two, meshing tooth one and the meshing of meshing tooth two, follow the driving wheel surface and be equipped with the driven lever, the both ends of driven lever respectively with follow the surperficial, the plunger of driving wheel articulated, the articulated shaft of driven lever and the articulated shaft of actuating lever are about the axis symmetry of plunger.

Through adopting above-mentioned technical scheme, through setting up the driven lever, make driven lever and actuating lever simultaneously to the plunger application of force, because the axis symmetry about the plunger of the direction of both forces, the power of its horizontal direction can offset each other, makes the plunger only receive the resultant force along vertical direction, makes the motion of plunger more stable, makes the life-span of this plunger pump can prolong.

Preferably, the driven wheel is meshed with two adjacent driving wheels through a second meshing tooth.

Through adopting above-mentioned technical scheme, can drive a plurality of drive wheels simultaneously from the setting of driving wheel, reduce required actuating mechanism's quantity.

Preferably, the driving wheel is coaxially provided with a rotating shaft, an auxiliary driving assembly is arranged at the end part of the rotating shaft, which is far away from the driving wheel, the structure of the auxiliary driving assembly is the same as that of the main driving assembly, and two groups of extrusion cavities and plungers are additionally arranged corresponding to the auxiliary driving assembly.

Through adopting above-mentioned technical scheme, the setting of vice drive assembly and four groups extrusion chambeies makes, and this plunger pump's water transmission efficiency further obtains improving.

Preferably, the secondary drive assembly and the primary drive assembly are symmetrically distributed about the same vertical plane about which the plunger pump body is also symmetrical.

By adopting the technical scheme, when the main driving assembly and the auxiliary driving assembly are simultaneously operated by the arrangement, the stress on two sides of the plunger pump main body can be balanced, and the stability of the plunger pump main body is improved.

Preferably, drive wheel, plunger all are equipped with the articulated elements, the actuating lever is equipped with the perforation that supplies the articulated elements to pass, the articulated elements is equipped with the spacing portion that is used for deviating from the surface counterbalance of drive wheel with the actuating lever, articulated elements and drive wheel (plunger) threaded connection.

Through adopting above-mentioned technical scheme, articulated elements and drive wheel (plunger) threaded connection to personnel carry out the dismouting to the actuating lever and change.

Preferably, the plunger pump main part has into water spare, it is equipped with the intake antrum to advance water spare, each inhalant canal all communicates with the intake antrum, it is equipped with the port of intaking that is used for connecting outside water pipe to advance water spare.

Through adopting above-mentioned technical scheme, the setting of the piece of intaking, the required pipeline's of reducible intaking quantity is convenient for the plunger pump main part and is intake.

Preferably, the water inlet part is detachably connected with the plunger pump main body.

Through adopting above-mentioned technical scheme, the piece of intaking is connected with dismantling of plunger pump main part, and the personnel of being convenient for open inhalant canal and overhaul the check valve.

In summary, the present application includes at least one of the following beneficial technical effects:

the extrusion cavity, the plunger and the driving wheel are symmetrically arranged, so that the water supply amount of the plunger pump is more stable, and the fluctuation of the water yield is reduced;

by arranging the driven wheel, the force of the plunger is close to the axis direction of the plunger, so that the movement of the plunger is better and more stable;

the main driving assembly, the auxiliary driving assembly and the plunger pump main body are symmetrically arranged, so that the plunger pump is more stable in stress during operation.

Drawings

Fig. 1 is a perspective view of embodiment 1 of the present application.

Fig. 2 is a sectional view of embodiment 1 of the present application.

Fig. 3 is a schematic structural diagram of a main drive assembly and a sub drive assembly in embodiment 1 of the present application.

Fig. 4 is a perspective view of embodiment 2 of the present application.

Fig. 5 is a schematic structural view of a drive mechanism and a governor according to embodiment 2 of the present application.

Fig. 6 is a schematic view of a matching structure of a speed adjusting plate and a switching block in embodiment 2 of the present application.

Fig. 7 is a schematic structural view of a first meshing gear according to embodiment 2 of the present application.

Description of reference numerals: 1. a plunger pump body; 11. an extrusion chamber; 12. a water inlet channel; 121. a water inlet member; 13. a water outlet channel; 131. a water outlet member; 132. a water outlet pipe; 14. a one-way valve; 15. a plunger; 2. a main drive assembly; 21. a drive rod; 22. a drive wheel; 23. a driven wheel; 24. meshing a first gear; 25. a second meshing tooth; 26. a driven lever; 27. a rotating shaft; 28. an articulation member; 281. a limiting part; 3. A secondary drive assembly; 4. a drive mechanism; 41. a first gear assembly; 411. a first speed regulating gear; 412. a second speed regulating gear; 413. a third speed regulating gear; 42. a gear assembly II; 421. meshing a first gear; 422. a second meshing gear; 423. a third meshing gear; 43. a drive shaft; 44. a switching block; 45. a groove is embedded; 46. a ring groove; 47. a rotation resisting piece; 5. a speed regulating device; 51. a governor lever; 511. a reciprocating screw rod; 512. a rotating gear; 52. a speed regulation sheet; 6. a speed regulation disc; 61. the drive teeth.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

Example 1:

the embodiment of the application discloses a plunger pump. Referring to fig. 1 and 2, a plunger pump comprises a plunger pump body 1, wherein the plunger pump body 1 is provided with an extrusion cavity 11, a water inlet channel 12 and a water outlet channel 13, the water inlet channel 12 and the water outlet channel 13 are communicated with each other by extruding the extrusion cavity 11, check valves 14 are arranged in the water inlet channel 12 and the water outlet channel 13, and a plunger 15 is arranged on the inner wall of the extrusion cavity 11 in a sliding manner. Referring to fig. 2 and 3, the plunger pump body 1 is provided with a main drive assembly 2 that drives the plunger 15 to reciprocate, and a sub drive assembly 3. The main driving assembly 2 continuously extrudes the extrusion cavity 11 to extrude the water out of the extrusion cavity 11 and discharge the water through the water outlet channel 13.

Referring to fig. 1 and 3, twelve extrusion cavities 11 are provided, twelve water inlet channels 12, twelve water outlet channels 13 and twelve plungers 15 are provided corresponding to the extrusion cavities 11, the plunger pump body 1 is provided with a water inlet part 121 and a water outlet part 131, the water inlet part 121 is provided with a water inlet cavity, the water outlet part 131 is provided with a water outlet cavity, each water inlet channel 12 is communicated with the water inlet cavity, each water outlet channel 13 is communicated with the water outlet cavity, the water inlet part 121 is provided with a water inlet port for connecting an external water pipe, the water outlet part 131 is provided with a water outlet pipe 132 communicated with the water outlet cavity, and the water outlet part 131 and the water inlet part 121 are detachably connected with the plunger pump body 1 through bolts.

The arrangement of the water inlet part 121 and the water outlet part 131 can reduce the number of pipelines required by water inlet and outlet, and facilitate the water inlet and outlet of the plunger pump body 1; simultaneously, the water outlet piece 131 and the water inlet piece 121 are detachably connected with the plunger pump main body 1 through bolts, so that a person can conveniently open the water inlet channel 12 and the water outlet channel 13 to overhaul the check valve 14.

The twelve extrusion cavities 11 are divided into four groups by three, the three extrusion cavities 11 in each group are horizontally distributed along the length direction of the plunger pump main body 1, and the four groups of extrusion cavities 11 are distributed on a vertical surface in a matrix form, wherein the distribution form is two groups, namely two vertical groups and two horizontal groups.

Referring to fig. 1 and 3, the auxiliary driving assembly 3 and the main driving assembly 2 have the same structure, both include a driving rod 21 and a driving wheel 22 driven by a driving mechanism 4 disposed on the plunger pump body 1 to rotate, the driving wheel 22 is coaxially provided with a rotating shaft 27, the driving wheel 22 in the auxiliary driving assembly 3 and the driving wheel 22 in the main driving assembly 2 are respectively disposed at two ends of the rotating shaft 27, the driving mechanism 4 adopts a gear transmission mechanism, a power source thereof is a motor, the driving wheel 22 is disposed between two sets of extrusion cavities 11 in the vertical direction, an axis of the driving wheel 22 is perpendicular to an axis of the plunger 15 along the horizontal direction, six driving wheels 22 are disposed corresponding to the plunger 15, and each driving wheel 22 is horizontally distributed.

Referring to fig. 3, two ends of the driving rod 21 are respectively hinged to the end of the plunger 15 away from the squeezing chamber 11 and the surface of the driving wheel 22, two driving rods 21 are correspondingly installed on each driving wheel 22, the two driving rods 21 are distributed along the vertical direction, and the two driving rods 21 are respectively used for connecting the plungers 15 located at the upper side and the lower side of the driving wheel 22. The driving wheel 22 and the plunger 15 are both provided with hinge parts 28, the hinge parts 28 are bolts, the driving rod 21 is hinged with the driving wheel 22 (the plunger 15) through the hinge parts 28, and the axes of the hinge parts 28 are parallel. The two upper and lower drive rods 21 are hinged to the same hinge 28 on the surface of the drive wheel 22, the axis of the hinge 28 being offset from and parallel to the axis of the drive wheel 22. The drive rod 21 is provided with a through hole for the hinge element 28 to pass through, and the hinge element 28 is provided with a stop portion 281 for abutting against a surface of the drive rod 21 facing away from the drive wheel 22. The limiting portion 281 is a screw head of the bolt, and an end of the hinge member 28 on the plunger 15 departing from the screw head is connected with a butt block through a screw thread to serve as the limiting portion 281. The hinge 28 is screwed to the drive wheel 22 (plunger 15) to allow a person to replace or remove the drive rod 21.

After drive wheel 22 rotated, drive wheel 22 can drive two piece upper and lower actuating lever 21 simultaneous movement simultaneously, promote plunger 15, because two piece upper and lower actuating lever 21 articulate in the same point of drive wheel 22, so when drive wheel 22 rotated, the opposite condition of two actuating lever 21 motion position must appear, so every moment can have plunger 15 to push extrusion chamber 11, connect through outlet pipe 132, the rivers that make extrusion chamber 11 converge in outlet pipe 132, supplement each other, thereby make this plunger pump water output more stable, simultaneously twelve extrusion chamber 11's setting, make the water yield of this plunger pump obtain promoting greatly.

Referring to fig. 3, an angle formed between two straight lines connecting the hinge point of the two driving wheels 22 located at the end portion of each group of driving wheels and the center of the circle thereof is 120 degrees, and an angle formed between two straight lines connecting the hinge point of the two adjacent driving wheels 22 and the center of the circle thereof is 120 degrees, when the driving wheels 22 rotate for one cycle, the three plungers 15 in each group all move for one cycle (respectively perform one-time contraction and expansion), and since one-third cycle is separated between the movement states of each plunger 15, the water output amount is complemented with each other, and is maintained in a stable range, thereby reducing the fluctuation of the water supply amount.

The auxiliary driving assembly 3 and the main driving assembly 2 are symmetrically distributed about the same vertical plane, the plunger pump body 1 is also symmetrical about the vertical plane, and the hinge point on the driving wheel 22 in the auxiliary driving assembly 3 is different from the hinge point on the driving wheel 22 in the coaxial main driving assembly 2 by 120 degrees. This setting makes main drive assembly 2 and vice drive assembly 3 when moving simultaneously, and the atress of the both sides of plunger pump main part 1 can be balanced, improves the stability of plunger pump main part 1.

Referring to fig. 3, the plunger pump body 1 is rotatably provided with a driven wheel 23 having the same shape as the driving wheel 22, the peripheral side surface of the driving wheel 22 is provided with a first engaging tooth 24, the peripheral side surface of the driven wheel 23 is provided with a second engaging tooth 25, the first engaging tooth 24 is engaged with the second engaging tooth 25, the surface of the driven wheel 23 is provided with a driven rod 26, two ends of the driven rod 26 are respectively hinged with the surface of the driven wheel 23 and the plunger 15, the shape of the driven rod 26 is the same as that of the driving rod 21, the hinged shaft of the driven rod 26 is symmetrical to that of the driving rod 21 about the axis of the plunger 15, the driven wheel 23 is positioned between the two driving wheels 22, and the driven wheel.

The driven wheel 23 is arranged to drive the driving wheels 22 simultaneously, the number of the driving mechanisms 4 is reduced, the driven rod 26 is arranged simultaneously, the driven rod 26 and the driving rod 21 apply force to the plunger 15 simultaneously, and because the directions of the driven rod 26 and the driving rod 21 are symmetrical about the axis of the plunger 15, the forces in the horizontal direction are mutually offset, so that the plunger 15 only receives resultant force in the vertical direction, the movement of the plunger 15 is more stable, and the service life of the plunger pump is prolonged.

Example 2:

the present embodiment is different from embodiment 1 in that:

referring to fig. 4 and 5, the driving mechanism 4 in the plunger pump body 1 includes a first gear assembly 41, a second gear assembly 42 and a driving shaft 43, the driving shaft 43 is parallel to the rotating shaft 27, the first gear assembly 41 includes a first speed regulating gear 411, a second speed regulating gear 412 and a third speed regulating gear 413 which have sequentially increased diameters, the first speed regulating gear 411, the second speed regulating gear 412 and the third speed regulating gear 413 are sequentially and coaxially fixed on the rotating shaft 27, and the second gear assembly 42 includes a first meshing gear 421, a second meshing gear 422 and a third meshing gear 423. The first meshing gear 421, the second meshing gear 422 and the third meshing gear 423 are rotatably arranged on the driving shaft 43, the first meshing gear 421 is meshed with the first speed regulating gear 411, the second meshing gear 422 is meshed with the second speed regulating gear 412, the third meshing gear 423 is meshed with the third speed regulating gear 413, the driving shaft 43 is rotatably connected with the plunger pump body 1, and the end portion of the driving shaft 43 is used for being connected with an external motor.

Referring to fig. 5 and 6, the speed regulating device 5 is arranged in the plunger pump body 1, the speed regulating device 5 comprises a speed regulating rod 51 and three speed regulating plates 52, the speed regulating rod 51 is rotatably connected with the plunger pump body 1, the speed regulating rod 51 is formed by coaxially fixing three reciprocating screw rods 511, the three speed regulating plates 52 are respectively in threaded connection with the three reciprocating screw rods 511, and the speed regulating plates 52 are also in sliding connection with a sliding rod arranged on the plunger pump body 1.

The driving shaft 43 is provided with a switching block 44 in a sliding manner, the switching block 44 is connected with the driving shaft 43 through a key slot and can be driven by the driving shaft 43 to rotate, the sliding direction of the switching block 44 is along the axial direction of the driving shaft 43, three switching blocks 44 are arranged corresponding to the first meshing gear 421, the second meshing gear 422 and the third meshing gear 423, the end portions of the first meshing gear 421, the second meshing gear 422 and the third meshing gear 423 are coaxially provided with an embedded groove 45 for the switching block 44 to enter, the embedded groove 45 is circular, the diameter of the embedded groove 45 is larger than that of the switching block 44, a resisting and rotating piece 47 used for resisting against the switching block 44 is fixedly arranged on the inner wall of the embedded groove 45, and a protrusion on the side wall of the switching block 44 can be abutted against the resisting and rotating piece 47, so that the first meshing gear 421 (the second meshing. The side wall of the switching block 44 is provided with a ring groove 46, the ring groove 46 is coaxial with the driving shaft 43, the speed regulation piece 52 is embedded into the ring groove 46 to push the switching block 44, the distances of the three switching blocks 44 relative to the first meshing gear 421, the second meshing gear 422 and the third meshing gear 423 are sequentially increased, and the end parts of the bidirectional threaded sections of the three reciprocating screw rods 511 are respectively positioned above the three embedded grooves 45.

The outer wall of the plunger pump main body 1 rotates to be provided with a speed regulation disc 6, the speed regulation rod 51 is fixedly provided with a rotating gear 512, the side wall of the speed regulation disc 6 is provided with a driving tooth 61 meshed with the rotating gear 512, the disc surface of the speed regulation disc 6 is fixed with a handle, and the outer wall of the plunger pump main body 1 is provided with gear indication scales so as to accurately switch gears.

The implementation principle of the plunger pump in the embodiment of the application is as follows: when a person needs to adjust the water yield of the plunger pump, because the first meshing gear 421, the second meshing gear 422 and the third meshing gear 423 are only rotationally connected with the drive and cannot drive the rotating shaft 27 to rotate, the person can rotate the speed regulation disc 6 to enable the reciprocating screw rod 511 to rotate, the speed regulation piece 52 pushes the three switching blocks 44 to move, firstly, one of the switching blocks 44 enters the embedded groove 45 of the first meshing gear 421, the edge part of the switching block is convexly and rotationally abutted against the abutting part 47 to drive the first meshing gear 421 to rotate, the first meshing gear 421 drives the rotating shaft 27 to rotate through the first speed regulation gear 411, the rotating speed of the rotating shaft 27 is in a minimum state, at the moment, the water yield of the plunger pump is minimum (in a low gear), then, the person continues to rotate the speed regulation disc 6, due to the characteristic of the reciprocating screw rod 511, the switching block 44 moves back after moving to the end part of the reciprocating screw rod 511, so that the switching, then the other switching block 44 enters the embedded groove 45 on the second meshing gear 422, because the diameter of the second meshing gear 422 is larger than that of the first meshing gear 421, the diameter of the second speed regulating gear 412 is smaller than that of the first speed regulating gear 411, the rotating speed of the rotating shaft 27 is increased, the water yield of the plunger pump is increased (in a middle gear), a person in the same way continues to rotate the speed regulating plate 6, the switching block 44 is separated from the embedded groove 45 on the second meshing gear 422, the last switching block 44 enters the embedded groove 45 of the third meshing gear 423, and the water yield of the plunger pump reaches the highest level (in a high gear).

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.