CN107852929B

CN107852929B - Hydrodynamic spiral fertilizer injection pump

Info

Publication number: CN107852929B
Application number: CN201711297660.0A
Authority: CN
Inventors: 莫彦; 王建东; 许迪; 张彦群; 龚时宏; 杨彬; 王海涛; 王传娟; 李巧灵
Original assignee: China Institute of Water Resources and Hydropower Research
Current assignee: China Institute of Water Resources and Hydropower Research
Priority date: 2017-12-08
Filing date: 2017-12-08
Publication date: 2023-04-07
Anticipated expiration: 2037-12-08
Also published as: CN107852929A

Abstract

The invention discloses a hydrodynamic spiral fertilizer injection pump, which comprises a hydrodynamic operation area, a unidirectional fertilizer injection channel and a fertilizer liquid conveying area, wherein the hydrodynamic operation area is provided with a water inlet and a water outlet; the hydrodynamic operation area comprises a shell, the surface of the shell is provided with a water inlet and a water outlet, and the hydrodynamic transmission mechanism is arranged inside the shell; the one-way fertilizer injection channel comprises a shell, the shell is fixedly connected with the shell, a rotating shaft is arranged in the shell, the rotating shaft is connected with the hydrodynamic transmission mechanism, a channel is arranged in the rotating shaft, a conical piston is sleeved outside the rotating shaft, and the bottom of the conical piston is detachably connected with a bearing; the bearing is formed by nesting a plurality of bearing sections, and the bearing is clamped with a helical blade; a shell is arranged at the periphery of the helical blade and is formed by connecting a plurality of shell sections through threads; one end of the shell is in threaded connection with the shell, and the other end of the shell is connected with the fertilizer barrel through a pipe fitting and a connecting sleeve; the spiral blade, the bearing and the shell form a fertilizer liquid conveying area. By adopting the fertilizer injection pump with the structure, the technical problem that the fertilizer suction effect is easily influenced by the structural size, the manufacturing precision and the material formula of equipment can be effectively solved.

Description

Hydrodynamic spiral fertilizer injection pump

Technical Field

The invention belongs to the technical field of agricultural tools, and particularly relates to a hydrodynamic spiral fertilizer injection pump.

Background

The integration of micro-irrigation and water-fertilizer is a high and new technology combining agricultural irrigation and fertilizer application, and it uses pressure irrigation system and fertilizer application equipment to blend soluble solid fertilizer or liquid fertilizer into fertilizer liquor, which is then mixed with irrigation water and uniformly, accurately, regularly and quantitatively supplied to crops for absorption.

With the wide application of the pipelining irrigation technologies such as micro-irrigation, spray irrigation, low-pressure pipeline water delivery and the like, the fertilizer application equipment and the technology are rapidly developed and applied. The present fertilizing equipment without external power includes differential pressure fertilizing tank, venturi injector and proportional fertilizing pump. The pressure difference type fertilization tank utilizes two positions of the upstream and downstream of the water delivery pipe to form pressure difference to inject fertilizer liquid into the system, and has the advantages of simple manufacture and low manufacturing cost, and has the defects of uneven concentration of the fertilizer injection solution, the concentration of the fertilizer injection solution tends to be larger first and smaller second, the volume of the tank body is limited, a pressure cover needs to be opened to add the fertilizer after the fertilizer is completely absorbed, the operation is troublesome, and the operation is not suitable for automatic operation; the venturi injector uniformly sucks fertilizer solution from an open fertilizer barrel into a pipeline system for fertilization by utilizing vacuum suction force generated by water flow passing through the venturi tube, and has the advantages of simple operation, convenient movement and the defects of large water loss, low efficiency and small control area; the proportional fertilization pump utilizes pressure water of an irrigation system pipeline to drive a piston, fertilizer liquid is pumped along with reciprocating motion of the piston, the proportional fertilization pump has the advantages of accurate fertilization and complex structure, has high requirements on component material and manufacturing precision, and the tightness of a fertilizer suction piston and a pipe wall and a mechanical linkage reversing mechanism for realizing the reversing motion of the piston need a high production process to ensure the reliability and durability of the operation of the proportional fertilization pump. The proportion fertilization pump of domestic manufacturing can not satisfy the quality requirement, can only rely on the foreign import, and the investment is big, and application range only restricts economic crops such as big-arch shelter vegetables melon and fruit, to field grain crop planting, mainly relies on the differential pressure type fertilization jar to fertilize, and the fertilization mode is comparatively extensive.

The operating principle of the Venturi injector and the proportional fertilizer pump which can realize micro-irrigation automatic management in the fertilizer applying equipment is that negative pressure is utilized to absorb fertilizer, and the fertilizer absorbing effect is very easily influenced by the structural size, the manufacturing precision and the material formula of the equipment, so that the development of the micro-irrigation fertilizer applying equipment in China is greatly inhibited.

Disclosure of Invention

Aiming at the prior art, the invention provides a hydrodynamic spiral fertilizer injection pump, which utilizes the mechanical principle that an Archimedes spiral blade conveys fertilizer liquid so as to solve the technical problem that the fertilizer absorption effect is easily influenced by the structural size, the manufacturing precision and the material formula of equipment.

In order to achieve the purpose, the invention adopts the technical scheme that: the hydrodynamic spiral fertilizer injection pump comprises a hydrodynamic operation area, a one-way fertilizer injection channel and a fertilizer liquid conveying area; the hydrodynamic operation area comprises a machine shell, the surface of the machine shell is provided with a water inlet and a water outlet, and a hydrodynamic transmission mechanism is arranged in the hydrodynamic operation area; the one-way fertilizer injection channel comprises a shell, the shell is fixedly connected with the shell, a rotating shaft is arranged in the shell, the rotating shaft is connected with the hydrodynamic transmission mechanism through a second bevel gear arranged at the top, a channel communicated with the hydrodynamic operation area is arranged in the rotating shaft, a movable conical piston is sleeved outside the rotating shaft, and the bottom of the rotating shaft is detachably connected with a bearing; the bearing is formed by nesting a plurality of bearing sections, and the bearing is clamped with a helical blade; a shell is arranged at the periphery of the helical blade and consists of a plurality of shell sections which are connected through screw threads; one end of the shell is in threaded connection with the shell, and the other end of the shell is connected with the fertilizer barrel through a connecting sleeve and a pipe fitting; the spiral blade, the bearing and the shell form a fertilizer liquid conveying area.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the hydrodynamic transmission mechanism comprises a water turbine, a water turbine bearing, a first cylindrical gear, a first bevel gear, a second cylindrical gear and a first bearing; the water turbine and the first cylindrical gear are fixed on a water turbine bearing, the first bevel gear and the second cylindrical gear are fixed on the first bearing, the first bevel gear is meshed with the first cylindrical gear, and the second cylindrical gear is meshed with the second cylindrical gear; blades of the water turbine are opposite to the water inlet, and an internal channel of the rotating shaft is opposite to the water outlet.

Further, the rotating shaft is divided into an upper section and a lower section, wherein the upper section is a hollow pipe, a channel is arranged in the hollow pipe, and the lower section is a cylinder; the side wall of the hollow pipe is provided with a radial through hole and a spring baffle, the top end of the hollow pipe is provided with a second bevel gear, and the middle part of the second bevel gear is provided with a through hole; the bottom of the cylinder is detachably connected with a bearing; the top of the conical piston is fixedly connected with a spring, the spring is sleeved on the rotating shaft, and the other end of the spring is fixedly connected with the spring baffle.

Furthermore, the bottom of the cylinder is provided with a threaded blind hole, and the upper end of the bearing is provided with threads; the bearing is connected with the cylindrical thread.

Further, the bearing joint is divided into an upper section, a middle section and a lower section, wherein the upper section is a hollow pipe, a square clamping shaft is arranged in the hollow pipe, a clamping groove is arranged in the middle section, the lower section is a hollow column, and a square bayonet matched with the square clamping shaft is arranged in the hollow column; the hollow column can be inserted into the hollow pipe on the other bearing joint, and the square clamping shaft in the hollow pipe can be inserted into the square bayonet in the hollow column; the helical blades are distributed in an Archimedes spiral line, wherein a plurality of clips matched with the clamping grooves are arranged on the central axis, and the helical blades are clamped on the bearing through the clips.

Furthermore, the spiral blade is made of elastic rubber, and an interlayer is arranged in the spiral blade; the interlayer is a dentate sheet made of hard elastic material.

Furthermore, the shell section and the bearing section are equal in length, the upper end of the shell section is provided with an external thread, the lower end of the shell section is provided with an internal thread, and the shell sections are in threaded connection.

Furthermore, the shell section is made of hard plastics.

Further, the shell is connected with the pipe fitting through a connecting sleeve; the connecting sleeve is a hollow pipe sleeve, the top end of the connecting sleeve is provided with an internal thread, the bottom end of the connecting sleeve is provided with an external thread, the connecting sleeve is internally provided with a barrier strip, and the middle part of the barrier strip is provided with a through hole for fixing the bearing; two ends of the connecting sleeve are respectively connected with the shell and the pipe fitting through screw threads.

The invention has the beneficial effects that:

1. and the hydraulic drive is utilized, external power is not needed, and energy conservation and emission reduction are realized.

2. The helical blades of the invention are distributed according to Archimedes spiral line, and the invention has simple structure and lower requirements on material and production precision.

3. The conical piston ensures that the fertilizer liquid can only move in one direction, and water in the head part of the micro-irrigation system is prevented from flowing backwards.

4. The helical blade is made of elastic rubber, so that the blade can be kept in close contact with the shell, and the fertilizer conveying efficiency is improved. The interlayer is arranged in the spiral blade and made of hard elastic materials such as stainless steel, the strength of the spiral blade is improved, and the spiral blade cannot be distorted and deformed in the operation process.

5. The helical blade is connected with the clamping groove on the telescopic bearing through the clamp, and is convenient to disassemble, clean and replace.

6. The bearing section is divided into three sections, and every two bearing sections can be mutually nested, so that the length of the bearing is convenient to adjust, and the use is more flexible and convenient. The solid column on the bearing joint is in interference fit with the hollow tube on the other bearing joint, so that the nesting is more stable, and the condition that the bearing joints are mutually separated cannot occur in the using process. Meanwhile, the square clamping shaft of the bearing joint is in interference fit with the square bayonet on the other bearing joint, so that synchronous rotation of all the bearing joints is realized. The casing comprises the shell festival, and threaded connection between the shell festival can carry out length adjustment according to the different intervals with the fertilizer bucket, strong adaptability, easily installation.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of a hydrodynamic operating area;

FIG. 3 is a cross-sectional view of a one-way fertilizer injection channel;

FIG. 4 is a sectional view of the rotating shaft;

FIG. 5 is a perspective view of the liquid fertilizer delivery area;

FIG. 6 is a front cross-sectional view of a bearing joint;

FIG. 7 is a left sectional view of a bearing section;

FIG. 8 is a front view of a helical blade;

FIG. 9 is an enlarged view of the sandwich and catches on the helical blade;

fig. 10 is an assembly view of the present invention.

Fig. 11 is a top view of the connection sleeve;

fig. 12 is a sectional view of the connecting sleeve;

wherein, 1, a hydrodynamic operating area; 11. a water inlet; 12. a water turbine; 13. a water turbine bearing; 14. a power transmission gear set; 141. a first cylindrical gear; 142. a first bevel gear; 143. a second cylindrical gear; 144. a first bearing; 15. a water outlet; 16. a housing;

2. a one-way fertilizer injection channel; 21. a rotating shaft; 211. a channel; 212. a cylinder; 213. a radial through hole; 214. a spring baffle; 215. a second bevel gear; 22. a conical piston; 23. a spring; 24. a housing; 241. a wedge-shaped boss;

3. a fertilizer liquid conveying area; 31. a bearing; 311. a bearing section; 3111. a card slot; 3112. a hollow pipe; 3113. a square clamping shaft; 3114. a hollow column; 3115. a square bayonet; 32. a helical blade; 321. a central axis; 322. a clip; 323. an interlayer; 33. a housing; 4. a fertilizer barrel; 5. a pipe fitting; 51. a valve; 6. connecting sleeves; 61. blocking strips; 62. and a through hole.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

In the embodiment of the invention, as shown in fig. 1 to 10, a hydrodynamic spiral fertilizer injection pump is provided, which comprises a hydrodynamic operation area 1, a unidirectional fertilizer injection channel 2 and a fertilizer liquid conveying area 3.

As shown in fig. 1 and 2, the hydrodynamic operation area 1 includes a casing 16, a water inlet 11 and a water outlet 15 are disposed on the surface of the casing 16, and a hydrodynamic transmission mechanism is disposed inside the casing. The hydrodynamic drive mechanism includes a turbine 12, a turbine bearing 13, and a power conducting gear set 14. Power transmission gear set 14 includes a first cylindrical gear 141, a first bevel gear 142, a second cylindrical gear 143, and a first bearing 144; the water turbine 12 and the first cylindrical gear 141 are fixed on the water turbine bearing 13, the first bevel gear 142 and the second cylindrical gear 143 are fixed on the first bearing 144, and the first bevel gear 142 is meshed with the first cylindrical gear 141; the blades of the water turbine 12 are opposite to the water inlet 11.

As shown in fig. 3 and 4, the one-way fertilizer injection channel 2 includes a housing 24, the housing 24 is fixedly connected to the casing 16, and a rotating shaft 21 is disposed inside the housing 24. The rotating shaft 21 is divided into an upper section and a lower section, wherein the upper section is a hollow tube, the inside of the hollow tube is a channel 211, and the lower section is a cylinder 212. The side wall of the hollow tube is provided with a radial through hole 213 and a raised spring baffle 214, the top end of the hollow tube is provided with a second bevel gear 215, the middle part of the second bevel gear 215 is provided with a through hole, the through hole is opposite to the water outlet 15 in the figure 2, and the second bevel gear 215 is meshed with the second cylindrical gear 143 in the figure 2. The outside cover of pivot 21 is equipped with movable toper piston 22, and toper piston 22 top fixedly connected with spring 23, and spring 23 suit is on pivot 21, and the spring 23 other end and spring baffle 214 fixed connection. The conical piston 22 moves axially along the rotating shaft 21 under the combined action of the fertilizer liquid pressure at the lower end and the elastic force of the spring 23 at the upper end, controls the opening and closing of the radial through hole 213, controls the fertilizer liquid to enter the hollow channel 211 from the radial through hole 213, further enters the hydrodynamic operation area 1 in fig. 2, and is injected into the pipeline of the micro-irrigation system through the water outlet pipe 15. In order to limit the movement of the conical piston 22, a wedge-shaped boss 241 may be provided in the middle of the housing 24 to ensure better use.

As shown in fig. 5 to 7, the fertilizer solution feeding area is constituted by a bearing 31, a spiral blade 32, and a casing 33. The bearing 31 is detachably attached to the bottom of the cylinder 212 of the rotary shaft 21. The detachable connection mode is preferably threaded connection, and the specific method comprises the following steps: the bottom of the cylinder 212 is provided with a threaded blind hole, the top end of the bearing 31 is provided with threads, and the bearing 31 is screwed in the threaded blind hole at the bottom of the cylinder 212 through the threads, so that the bearing 31 is fixedly connected with the rotating shaft 21. The bearing 31 is formed by nesting a plurality of bearing joints 311. Bearing section 311 is divided into upper, middle and lower three sections, except that the upper section of bearing section 311 that is connected with cylinder 212 is the bolt, the upper section of other bearing sections 311 is hollow tube 3112, is provided with square card axle 3113 in the hollow tube 3112, and the middle section is provided with draw-in groove 3111, and the lower section is hollow post 3114, is provided with square bayonet 3115 with square card axle 3113 matched with in hollow post 3114. When the bearing segments 311 are nested, the hollow shaft 3114 of the previous bearing segment 311 is inserted into the hollow tube 3112 of the next bearing segment 311, and at this time, the square bayonet 3113 is inserted into the square bayonet 3115, so that the bearing segments 311 nested with each other can rotate synchronously. In order to achieve more stable nesting and avoid the situation that the bearing joints 311 are separated from each other in the using process, interference fit is respectively formed between the hollow column 3114 and the hollow tube 3112 and between the square bayonet 3113 and the square bayonet 3115. A slot 3111 is formed in the middle of the bearing segment 311 for engaging the helical blade 32.

As shown in fig. 8 and 9, the helical blades 32 are distributed in an "archimedes spiral", and the central axis 321 is provided with clips 322 that are matched with the slots 3111 in fig. 6, and the number of the clips 322 may be equal to the number of the bearing segments 311, or may be half of the number of the bearing segments 311; when the number of the clips 322 is half of the number of the bearing segments 311, the clips 322 are arranged at intervals, that is, every two bearing segments 311 are connected with the helical blade 32 in a clamping manner. To improve the efficiency of the fertilizer delivery, the helical blade 32 is preferably in close contact with the housing 33. The spiral blade 32 of the present invention is made of elastic rubber, and the edge thereof abuts against the housing 33, not only rotating smoothly, but also causing no damage to the housing 33. The rubber is soft, and the helical blade 32 prepared by the rubber is twisted and deformed during the rotating operation process. Therefore, in the present invention, an interlayer 323 is further provided inside the helical blade 32, and the interlayer 323 is a toothed thin sheet made of a hard elastic material such as stainless steel. Further, the helical blade 32 may also vary with the length of the bearing 31. The spiral blade 32 is provided with a shell 33 at the periphery, and the shell 33 is composed of a plurality of shell sections so as to conveniently adjust the length. For use with bearing joint 311, the shell joint is of a length comparable to bearing joint 311. The shell sections are connected through threads, the dismounting is convenient and fast, and the length adjustment of the shell 33 can be realized by connecting shell sections with different quantities.

As shown in fig. 10, the lower end of the casing 24 of the one-way fertilizer injection passage 2 is provided with an external thread, the upper end of the casing 33 is in threaded connection with the casing 24, the lower end is connected with the pipe fitting 5 through the connecting sleeve 6, the pipe fitting 5 is connected with the fertilizer barrel 4, the pipe fitting 5 is provided with a valve 51, and the valve 51 is used for controlling the flow. As shown in fig. 11 and 12, the connecting sleeve 6 is a hollow pipe sleeve, and the upper end of the connecting sleeve is provided with an internal thread and the lower end of the connecting sleeve is provided with an external thread; the internal thread of upper end cooperatees with the external thread of casing 33 lower extreme, and the external thread of lower extreme cooperatees with the internal thread that sets up on pipe fitting 5, and the adapter sleeve 6 both ends respectively with casing 33 and pipe fitting 5 threaded connection. The connecting sleeve 6 is internally provided with a barrier strip 61, two sides of the barrier strip 61 are fertilizer liquid channels, the middle part of the barrier strip 61 is provided with a through hole 62, the diameter of the through hole 62 is slightly larger than that of the bearing 31, the lower end of the bearing 31 is arranged in the through hole 62, and the bearing 31 can flexibly rotate in the through hole 62 during operation.

The power generation and conduction process of the invention comprises the following steps: as shown in fig. 2, water enters from the water inlet pipe 11 and impacts the water turbine 12, the water turbine 12 rotates counterclockwise around the water turbine bearing 13, the water turbine bearing 13 drives the first cylindrical gear 141 to rotate counterclockwise, the first cylindrical gear 141 drives the first bevel gear 142 to rotate clockwise (in a top view direction), and the first bevel gear 142 drives the second cylindrical gear 143 to rotate clockwise (in a top view direction) through the first bearing 144. The rotation of the second cylindrical gear 143 drives the second bevel gear 215 to rotate clockwise (upward right looking direction), the second bevel gear 215 drives the rotating shaft 21 to rotate clockwise (upward right looking direction), the rotating shaft 21 drives the bearing 31 to rotate clockwise (upward right looking direction), and the bearing 31 drives the helical blade 32 to rotate clockwise (upward right looking direction). The direction of water flow is shown by the solid arrows in fig. 2.

The fertilizer liquid conveying process comprises the following steps: as shown in fig. 10, the fertilizer liquid in the fertilizer barrel 4 is delivered into the one-way fertilizer injection channel 2 from the bottom end under the rapid rotation of the spiral blade 32, the pressure of the fertilizer liquid makes the conical piston 22 overcome the elastic force of the spring 23 and move upwards along the rotating shaft 21, the radial through hole 213 of the rotating shaft 21 is opened, and the fertilizer liquid enters the hydrodynamic operation area 1 through the radial through hole 213 and the channel 211 and flows out from the water outlet pipe 15 under the action of water flow. The fertilizer solution flow direction is shown by the solid arrows in fig. 10.

While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims

1. A hydrodynamic force spiral fertilizer injection pump is characterized in that: comprises a hydrodynamic operating area (1), a unidirectional fertilizer injection channel (2) and a fertilizer liquid conveying area (3); the hydrodynamic operation area (1) comprises a machine shell (16), wherein a water inlet (11) and a water outlet (15) are formed in the surface of the machine shell (16), and a hydrodynamic transmission mechanism is arranged in the hydrodynamic operation area; the one-way fertilizer injection channel (2) comprises a shell (24), the shell (24) is fixedly connected with the machine shell (16), a rotating shaft (21) is arranged in the shell, the rotating shaft (21) is connected with the hydrodynamic transmission mechanism through a second bevel gear (215) arranged at the top, a channel (211) communicated with the hydrodynamic operation area (1) is arranged in the rotating shaft (21), a movable conical piston (22) is sleeved outside the channel, and the bottom of the channel is detachably connected with a bearing (31); the bearing (31) is formed by nesting a plurality of bearing sections (311), and a helical blade (32) is clamped on the bearing (31); a shell (33) is arranged on the periphery of the helical blade (32), the shell (33) is composed of a plurality of shell sections, and the shell sections are in threaded connection; one end of the shell (33) is in threaded connection with the shell (24), and the other end of the shell is connected with the fertilizer barrel (4) through a connecting sleeve (6) and a pipe fitting (5); the bearing (31), the spiral blade (32) and the shell (33) form a fertilizer liquid conveying area (3); the hydrodynamic transmission mechanism comprises a water turbine (12), a water turbine bearing (13), a first cylindrical gear (141), a first bevel gear (142), a second cylindrical gear (143) and a first bearing (144); the water turbine (12) and the first cylindrical gear (141) are fixed on the water turbine bearing (13), the first bevel gear (142) and the second cylindrical gear (143) are fixed on the first bearing (144), the first bevel gear (142) is meshed with the first cylindrical gear (141), and the second cylindrical gear (143) is meshed with the second cylindrical gear (215); blades of the water turbine (12) are opposite to the water inlet (11), and an internal channel (211) of the rotating shaft (21) is opposite to the water outlet (15); the rotating shaft (21) is divided into an upper section and a lower section, wherein the upper section is a hollow pipe, a channel (211) is arranged in the hollow pipe, and the lower section is a cylinder (212); the side wall of the hollow pipe is provided with a radial through hole (213) and a spring baffle (214), the top end of the hollow pipe is provided with a second bevel gear (215), and the middle part of the second bevel gear (215) is provided with a through hole; the bottom of the cylinder (212) is detachably connected with a bearing (31); the top of the conical piston (22) is fixedly connected with a spring (23), the spring (23) is sleeved on the rotating shaft (21), and the other end of the spring (23) is fixedly connected with the spring baffle (214).

2. The hydrodynamic screw fertilizer injection pump according to claim 1, wherein: the bottom of the cylinder (212) is provided with a threaded blind hole, and the top end of the bearing (31) is provided with threads; the bearing (31) is in threaded connection with the cylinder (212).

3. The hydrodynamic screw fertilizer injection pump according to claim 1, wherein: the bearing joint (311) is divided into an upper section, a middle section and a lower section, wherein the upper section is a hollow pipe (3112), a square clamping shaft (3113) is arranged in the hollow pipe (3112), a clamping groove (3111) is arranged in the middle section, a hollow column (3114) is arranged on the lower section, and a square bayonet (3115) matched with the square clamping shaft (3113) is arranged in the hollow column (3114); the hollow column (3114) is inserted into the hollow pipe (3112) on the other bearing joint (311), and the square bayonet (3113) in the hollow pipe (3112) is inserted into the square bayonet (3115) in the hollow column (3114); the helical blade (32) is distributed in an Archimedes spiral line, a plurality of clips (322) matched with the clamping grooves (3111) are arranged on an axis (321), and the helical blade (32) is clamped on the bearing (31) through the clips (322).

4. The hydrodynamic screw fertilizer injection pump of claim 1 or 3, wherein: the spiral blade (32) is made of elastic rubber, and an interlayer (323) is arranged in the spiral blade; the interlayer (323) is a toothed sheet made of hard elastic material.

5. The hydrodynamic spiral fertilizer injection pump of claim 1, further comprising: the shell section is equal to the bearing section (311) in length, an internal thread is arranged at the upper end of the shell section, an external thread is arranged at the lower end of the shell section, and the shell sections are in threaded connection.

6. The hydrodynamic spiral fertilizer injection pump of claim 5, further comprising: the shell section is made of hard plastics.

7. The hydrodynamic spiral fertilizer injection pump of claim 1, further comprising: the shell (33) is connected with the pipe fitting (5) through a connecting sleeve (6); the connecting sleeve (6) is a hollow pipe sleeve, the top end of the connecting sleeve is provided with an internal thread, the bottom end of the connecting sleeve is provided with an external thread, a blocking strip (61) is arranged in the connecting sleeve, and the middle part of the blocking strip (61) is provided with a through hole (62) for fixing the bearing (31); and two ends of the connecting sleeve (6) are respectively in threaded connection with the shell (33) and the pipe fitting (5).