阅读说明：本技术 加注泵 (Filling pump ) 是由 李津泽 黄鹤 敖千 涂汉炯 石静 母沉汰 张道凯 欧志飞 于 2021-09-18 设计创作，主要内容包括：加注泵,用于解决现有技术中的泵对流体输送过程中流速调节范围小的技术问题。包括泵体,该泵体上按照液体流向依次设有进液通道、储液腔和出液通道,进液通道和出液通道内均设有封堵球,该封堵球可沿进液通道或出液通道滑动进而用于封堵进液通道的进液口或者封堵出液通道的进液口；连接环,泵体内开有安装腔,连接环设于安装腔内,该连接环固定连接活塞杆,该活塞杆穿设在储液腔内,该活塞杆在靠近安装腔的杆段周向与储液腔周向的内壁密封连接,该活塞杆与连接环外壁固定连接；驱动组件,该驱动组件设于泵体上且与连接环的内壁抵接；调节组件,该调节组件设于泵体上且与驱动组件连接,本发明调节范围大,主要用于输送流体。(The filling pump is used for solving the technical problem that the flow speed adjusting range of the pump in the prior art is small in the fluid conveying process. The liquid storage device comprises a pump body, wherein a liquid inlet channel, a liquid storage cavity and a liquid outlet channel are sequentially arranged on the pump body according to the liquid flow direction, and blocking balls are arranged in the liquid inlet channel and the liquid outlet channel and can slide along the liquid inlet channel or the liquid outlet channel so as to block a liquid inlet of the liquid inlet channel or a liquid inlet of the liquid outlet channel; the pump body is internally provided with a mounting cavity, the connecting ring is arranged in the mounting cavity, the connecting ring is fixedly connected with a piston rod, the piston rod is arranged in the liquid storage cavity in a penetrating mode, the piston rod is connected with the circumferential inner wall of the liquid storage cavity in a sealing mode in the circumferential direction of a rod section close to the mounting cavity, and the piston rod is fixedly connected with the outer wall of the connecting ring; the driving assembly is arranged on the pump body and is abutted against the inner wall of the connecting ring; the adjusting assembly is arranged on the pump body and connected with the driving assembly.)

1. A fill pump, comprising:

the liquid storage device comprises a pump body (1), wherein a liquid inlet channel (2), a liquid storage cavity (3) and a liquid outlet channel (4) are sequentially arranged on the pump body (1) according to the liquid flow direction, blocking balls (5) are respectively arranged in the liquid inlet channel (2) and the liquid outlet channel (4), and the blocking balls (5) can slide along the liquid inlet channel (2) or the liquid outlet channel (4) and are further used for blocking a liquid inlet of the liquid inlet channel (2) or blocking a liquid inlet of the liquid outlet channel (4);

the pump comprises a connecting ring (6), a mounting cavity (7) is formed in a pump body (1), the connecting ring (6) is arranged in the mounting cavity (7), the connecting ring (6) is fixedly connected with a piston rod (8), the piston rod (8) penetrates through the liquid storage cavity (3), the piston rod (8) is in sealing connection with the circumferential inner wall of the liquid storage cavity (3) in the circumferential direction of a rod section close to the mounting cavity (7), and the piston rod (8) is fixedly connected with the outer wall of the connecting ring (6);

the driving assembly is arranged on the pump body (1) and is abutted against the inner wall of the connecting ring (6) so as to drive the connecting ring (6) to move, and then the connecting ring (6) drives the piston rod (8) to slide in the liquid storage cavity (3) in a reciprocating manner;

the adjusting assembly is arranged on the pump body (1) and connected with the driving assembly to be used for continuously adjusting the driving assembly so as to enable the driving assembly to continuously change the moving stroke of the connecting ring (6).

2. The fill pump of claim 1, wherein: the drive assembly is including wearing to establish rotary drum (9) and eccentric ring (10) in the pump body (1), and the pump body (1) is stretched out to rotary drum (9) one end, and the centre bore of establishing in go-between (6) is worn to establish by the rotary drum (9) other end, the rotary drum (9) outside is located to eccentric ring (10), and the inner wall butt of this eccentric ring (10) and go-between (6), and this eccentric ring (10) are used for pushing away go-between (6) along with rotary drum (9) rotation, and then make go-between (6) remove.

3. The fill pump of claim 2, wherein: the adjusting component comprises a penetrating rod (11) and a driving piece (12), connecting block (13) and pivot (14), wear to establish pole (11) and wear to establish in rotary drum (9) from the outer wearing of the pump body (1), wear to establish pole (11) and rotary drum (9) coaxial and wear to establish pole (11) and can follow its axis reciprocating sliding, driving piece (12) are located and are worn to establish pole (11) and go up in order to be used for the drive to wear to establish pole (11) and slide, connecting block (13) are located in rotary drum (9) and connecting block (13) and are connected with wearing to establish pole (11) tip rotation, it has bar hole (15) to open on connecting block (13), open on rotary drum (9) lateral wall and be equipped with two bar wearing hole (16), pivot (14) are worn to establish in bar hole (15) and two wearing hole (16) and pivot (14) all can be followed bar hole (15) and wearing hole (16) and slide, the both ends of this pivot (14) all with eccentric ring (10) fixed connection.

4. The fill pump of claim 3, wherein: driving piece (12) are for having the internal screw thread section of thick bamboo structure, and this driving piece (12) are worn to establish on pump body (1) and are rotated with pump body (1) and be connected, wear to establish pole (11) and be equipped with the screw thread on being close to the pole section in the pump body (1) outside, driving piece (12) cover is established and is worn to establish pole (11) and take on the screwed pole section and both threaded connection.

5. The fill pump of claim 4, wherein: a rotating handle (17) is fixed on the driving piece (12), and the rotating handle (17) is positioned on the outer side of the pump body (1).

6. The fill pump of claim 3, wherein: wear to establish pole (11) tip and inlay and be equipped with first bearing (18), connecting block (13) are pegged graft and are just connecting block (13) and the inner wall fixed connection of first bearing (18) centre bore in the centre bore of first bearing (18).

7. The fill pump of claim 2, wherein: a second bearing (19) is arranged in the pump body (1), the rotary drum (9) is arranged in a central hole of the second bearing (19) in a penetrating mode, and the rotary drum (9) is abutted to the inner wall of the central hole of the second bearing (19).

8. The fill pump of claim 7, wherein: the end part of the rotary drum (9) facing the outside of the pump body (1) is provided with a connecting hole (20).

9. The fill pump of claim 8, wherein: the rotary drum type switch is characterized by further comprising a switch assembly which is connected with the connecting hole (20) and is used for driving the rotary drum (9) to rotate.

10. The fill pump of claim 9, wherein: connecting hole (20) is coaxial with rotary drum (9), the switch subassembly includes two gears (23) that locate on the pump body (1) and mesh, pivot (24), wear to establish in connecting hole (20) and can follow connecting hole (20) gliding traveller (25), elastic component (26) and eccentric wheel (27), pivot (24) and one of them gear (23) fixed connection and both are coaxial, this pivot (24) stretches out the pump body (1), another gear (23) cover is established on rotary drum (9) and it can slide along rotary drum (9), install hole (28) have been opened along rotary drum (9) axial on this rotary drum (9) lateral wall, be fixed with connecting rod (29) between traveller (25) and the gear (23) of establishing on rotary drum (9), this connecting rod (29) wear to be established in install hole (28), and connecting rod (29) can slide along install hole (28), elastic component (26) cover is established on rotary drum (9), the end part of the elastic part (26) is abutted against a gear (23) sleeved on the rotary drum (9), the eccentric wheel (27) is arranged on the pump body (1), the eccentric wheel (27) can rotate and drive the sliding column (25) to slide, and the eccentric wheel (27) and the elastic part (26) are distributed on two sides of the gear (23) on the rotary drum (9).

Technical Field

The invention relates to the technical field of mechanical pumps, in particular to a filling pump.

Background

The pump is a power device used for pumping and conveying fluid, so that the pump is often used in occasions where the fluid is required to be conveyed, the flow rate and the flow rate of the fluid can be adjusted through the pump, a rotating shaft is generally arranged in the pump, and the conveying rate of the fluid by the pump can be adjusted by changing the rotating speed of the rotating shaft.

However, the above-mentioned existing pump still has an objective defect in the way of adjusting the liquid flow rate by adjusting the rotating speed of the rotating shaft, and because the rotating speed of the rotating shaft on the pump is generally only provided with a few adjusting gears, the pump in the prior art is only provided with a few conveying rates for conveying the fluid, and the adjusting range for adjusting the conveying rate of the fluid is small.

Disclosure of Invention

The invention aims to provide a filling pump aiming at the defects of the prior art, and aims to solve the technical problem that the pump in the prior art mentioned in the background technology has a small flow speed adjusting range in the fluid conveying process.

A fill pump, comprising:

the liquid storage device comprises a pump body, a liquid storage cavity and a liquid outlet channel, wherein the pump body is sequentially provided with the liquid inlet channel, the liquid storage cavity and the liquid outlet channel according to the liquid flow direction, and blocking balls are arranged in the liquid inlet channel and the liquid outlet channel and can slide along the liquid inlet channel or the liquid outlet channel so as to block a liquid inlet of the liquid inlet channel or a liquid inlet of the liquid outlet channel;

the pump body is internally provided with a mounting cavity, the connecting ring is arranged in the mounting cavity, the connecting ring is fixedly connected with a piston rod, the piston rod is arranged in the liquid storage cavity in a penetrating mode, the piston rod is connected with the circumferential inner wall of the liquid storage cavity in a sealing mode in the circumferential direction of a rod section close to the mounting cavity, and the piston rod is fixedly connected with the outer wall of the connecting ring;

the driving assembly is arranged on the pump body and is abutted against the inner wall of the connecting ring so as to drive the connecting ring to move, and then the connecting ring drives the piston rod to slide in the liquid storage cavity in a reciprocating manner;

and the adjusting assembly is arranged on the pump body and is connected with the driving assembly so as to be used for continuously adjusting the driving assembly and further continuously changing the moving stroke of the connecting ring of the driving assembly.

The working principle is as follows:

the fluid flows from the liquid inlet channel into the liquid storage cavity, then flows from the liquid storage cavity to the liquid outlet channel, and finally flows out from the liquid outlet channel.

The driving assembly drives the connecting ring to slide, so that the connecting ring drives the piston rod to slide in the liquid storage cavity, a negative pressure cavity is formed in the liquid storage cavity, then an external fluid jacks a blocking ball for blocking a liquid inlet of the liquid inlet channel, and the fluid enters the liquid inlet channel and enters the liquid storage cavity;

then the drive assembly drives the connecting ring to slide along the opposite direction, and then the connecting ring drives the piston rod to synchronously slide along the opposite direction, at the moment, the piston rod pushes the fluid in the liquid storage cavity in the return stroke process, and then the fluid in the liquid storage cavity pushes the blocking ball for blocking the liquid inlet of the liquid outlet channel, so that the fluid flows into the liquid outlet channel from the liquid storage cavity and is discharged from the liquid outlet channel, and meanwhile, the piston rod is in the process of the sliding return stroke, the fluid in the liquid storage cavity also pushes the blocking ball in the liquid inlet channel, so that the blocking ball in the liquid inlet channel slides in the liquid inlet channel and blocks the liquid inlet of the liquid inlet channel, and the fluid conveying process is finished.

When the flow rate of the fluid needs to be adjusted, an operator can adjust the driving assembly by means of the adjusting assembly, so that the driving assembly changes the distance of the stroke of the connecting ring, the connecting ring synchronously changes the stroke of the piston rod, after the stroke of the piston rod is changed, the size of the negative pressure cavity formed in the liquid storage cavity is changed, and the flow rate of the fluid entering the liquid storage cavity is changed, so that the effect of adjusting the flow rate of the fluid is achieved.

The invention has the beneficial effects that:

according to the invention, an operator can adjust the driving assembly by means of the adjusting assembly, so that the driving assembly changes the stroke distance of the connecting ring, and further the connecting ring synchronously changes the stroke size of the piston rod, after the stroke of the piston rod is changed, the size of the negative pressure cavity formed in the liquid storage cavity is changed, and further the fluid flow rate of the fluid entering the liquid storage cavity is changed, so that the effect of adjusting the fluid flow rate is achieved, when the driving assembly is continuously adjusted, the driving assembly can also continuously change the moving stroke of the connecting ring, and further the size of the stroke negative pressure cavity of the liquid storage cavity can be continuously changed, so that the effect of continuously adjusting the fluid flow rate is achieved.

Drawings

FIG. 1 is a schematic view in longitudinal section of an embodiment of the present invention;

FIG. 2 is a schematic view in transverse cross-section of an embodiment of the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 1.

Description of reference numerals: the device comprises a pump body 1, a liquid inlet channel 2, a liquid storage cavity 3, a liquid outlet channel 4, a blocking ball 5, a connecting ring 6, a mounting cavity 7, a piston rod 8, a rotary drum 9, an eccentric ring 10, a penetrating rod 11, a driving piece 12, a connecting block 13, a shaft pin 14, a strip-shaped hole 15, a penetrating hole 16, a rotating handle 17, a first bearing 18, a second bearing 19, a connecting hole 20, a pushing plate 21, a ball 22, a gear 23, a rotating shaft 24, a sliding column 25, an elastic piece 26, an eccentric wheel 27, a mounting hole 28, a connecting rod 29, a third bearing 30 and a fourth bearing 31.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the embodiments.

As shown in fig. 1 and 2, the filling pump includes:

the pump body 1 is equipped with inlet channel 2, stock solution chamber 3 and liquid outlet channel 4 according to the liquid flow direction in proper order on this pump body 1, all is equipped with blocking ball 5 in inlet channel 2 and the liquid outlet channel 4, and this blocking ball 5 can be followed inlet channel 2 or liquid outlet channel 4 slip and then be used for the inlet of shutoff inlet channel 2 or the inlet of shutoff liquid outlet channel 4.

Go-between 6, it has installation cavity 7 to open in the pump body 1, and in installation cavity 7 was located to go-between 6, this go-between 6 fixed connection piston rod 8, this piston rod 8 were worn to establish in stock solution chamber 3, and this piston rod 8 is fixed with push pedal 21 in the pole section circumference that is close to installation cavity 7, and this push pedal 21 and the inner wall sealing connection of 3 circumference in stock solution chamber, this piston rod 8 and 6 outer wall fixed connection of go-between.

The driving assembly is arranged on the pump body 1 and abutted against the inner wall of the connecting ring 6 to drive the connecting ring 6 to move, so that the connecting ring 6 drives the piston rod 8 to slide in the liquid storage cavity 3 in a reciprocating mode.

And the adjusting assembly is arranged on the pump body 1 and is connected with the driving assembly so as to be used for continuously adjusting the driving assembly and further continuously changing the moving stroke of the connecting ring 6.

As shown in fig. 1 and 2, the driving assembly includes a rotating cylinder 9 and an eccentric ring 10 penetrating through the pump body 1, one end of the rotating cylinder 9 extends out of the pump body 1, the other end of the rotating cylinder 9 penetrates through a central hole of the connecting ring 6, the eccentric ring 10 is arranged outside the rotating cylinder 9, the eccentric ring 10 is abutted to the inner wall of the connecting ring 6, and the eccentric ring 10 is used for pushing the connecting ring 6 along with the rotation of the rotating cylinder 9, so that the connecting ring 6 moves.

As shown in fig. 1, the adjusting assembly includes a penetrating rod 11, a driving member 12, a connecting block 13 and a shaft pin 14, the penetrating rod 11 penetrates through the rotary drum 9 from the outside of the pump body 1, the penetrating rod 11 is coaxial with the rotary drum 9 and can slide along the axis thereof in a reciprocating manner, the driving member 12 is disposed on the penetrating rod 11 to drive the penetrating rod 11 to slide, the connecting block 13 is disposed in the rotary drum 9 and is rotatably connected with the end of the penetrating rod 11, a bar-shaped hole 15 is formed in the connecting block 13, as shown in fig. 2, two bar-shaped penetrating holes 16 are formed in the side wall of the rotary drum 9, the shaft pin 14 penetrates through the bar-shaped hole 15 and the two penetrating holes 16, the shaft pin 14 can slide along the bar-shaped hole 15 and the penetrating hole 16, and both ends of the shaft pin 14 are fixedly connected with the eccentric ring 10. The driving piece 12 is for having an internal screw thread section of thick bamboo structure, and this driving piece 12 wears to establish on the pump body 1 and rotates with the pump body 1 and be connected, inlay between the driving piece 12 outer wall and the pump body 1 and establish many balls 22, wear to establish pole 11 and be equipped with the screw thread on being close to the pole section in the pump body 1 outside, driving piece 12 cover is established and is worn to establish pole 11 and take the screwed pole section on and both threaded connection. An operator can move back and forth along the axis of the driving part 12 through the driving part 12, the penetrating rod 11 drives the connecting block 13 to move synchronously in the moving process, and then the connecting block 13 drives the strip-shaped hole 15 to move, so that the side wall of the strip-shaped hole 15 pushes the shaft pin 14 to enable the shaft pin 14 to move in the penetrating hole 16, the shaft pin 14 moves to drive the eccentric ring 10 to move, and further the distance between the eccentric ring 10 and the rotary drum 9 is changed, after the distance between the eccentric ring 10 and the rotary drum 9 is improved, the track of the rotary drum 9 driving the eccentric ring 10 to rotate is changed, and further the stroke of the eccentric ring 10 pushing the connecting ring 6 is changed, so that the purpose of adjusting the strokes of the connecting ring 6 and the piston rod 8 is achieved, the mode can be adjusted continuously, and therefore the adjusting range of fluid flow can be greatly increased. A rotating handle 17 is fixed on the driving piece 12, the rotating handle 17 is positioned outside the pump body 1, and labor can be saved by rotating the driving piece 12 through the rotating handle 17.

As shown in fig. 1, the end of the penetrating rod 11 is embedded with a first bearing 18, the connecting block 13 is inserted into the central hole of the first bearing 18 and the connecting block 13 is fixedly connected with the inner wall of the central hole of the first bearing 18, and this way can reduce the friction force when the penetrating rod 11 and the connecting block 13 rotate relatively, so that the adjusting process is more labor-saving.

As shown in fig. 1, a second bearing 19 is arranged in the pump body 1, the drum 9 is inserted into a central hole of the second bearing 19, and the drum 9 abuts against the inner wall of the central hole of the second bearing 19, so that the relative friction force generated between the drum 9 and the pump body 1 in the rotation process can be reduced. The end part of the rotary drum 9 facing the outside of the pump body 1 is provided with a connecting hole 20, an operator can connect the rotating shaft on the motor with the rotary drum 9 through the connecting hole 20, and the connecting hole 20 is arranged to facilitate the connection of the rotary drum 9 with the rotating shaft of the motor.

As shown in fig. 1 and 3, a switch assembly is further included, which is connected to the connection hole 20 and is used to drive the rotation of the drum 9. The connecting hole 20 is coaxial with the rotary drum 9, the switch assembly comprises two gears 23 which are arranged on the pump body 1 and are meshed with each other, a rotating shaft 24, a sliding column 25 which is arranged in the connecting hole 20 in a penetrating mode and can slide along the connecting hole 20, an elastic piece 26 and an eccentric wheel 27, the rotating shaft 24 is fixedly connected with one gear 23 and is coaxial with the same, the rotating shaft 24 extends out of the pump body 1, the other gear 23 is sleeved on the rotary drum 9 and can slide along the rotary drum 9, a mounting hole 28 is formed in the side wall of the rotary drum 9 along the axial direction of the rotary drum 9, a connecting rod 29 is fixed between the sliding column 25 and the gear 23 sleeved on the rotary drum 9, the connecting rod 29 is arranged in the mounting hole 28 in a penetrating mode and can slide along the mounting hole 28, the elastic piece 26 is sleeved on the rotary drum 9, the end portion of the elastic piece 26 is abutted to the gear 23 sleeved on the rotary drum 9, the elastic piece 26 is of a spring structure, the eccentric wheel 27 is arranged on the pump body 1, and the eccentric wheel 27 can rotate and drive the sliding column 25 to slide, the eccentric wheel 27 and the elastic element 26 are distributed on two sides of the gear 23 on the rotary drum 9, a third bearing 30 is arranged in the pump body 1, the rotating shaft 24 penetrates through a central hole of the third bearing 30, a fourth bearing 31 is further arranged on the pump body 1, and the rotary drum 9 penetrates through a central hole of the fourth bearing 31.

The operator gives continuous output power to the rotating shaft 24, so that the rotating shaft 24 rotates, the rotating shaft 24 drives the gear 23 fixedly connected with the rotating shaft to rotate, the gear 23 drives the other gear 23 engaged with the gear to rotate, when the connection between the two gears 23 needs to be disconnected, the operator can drive the eccentric wheel 27 to rotate, the eccentric wheel 27 pushes the sliding column 25 in the rotating process, the sliding column 25 drives the gear 23 fixedly connected with the sliding column to slide along the axis of the rotating drum 9, so that the two gears 23 are disconnected, at this time, the rotating drum 9 does not rotate any more, after the operator drives the eccentric wheel 27 to rotate again, the eccentric wheel 27 rotates and resets, at this time, the elastic piece 26 pushes the gear 23 abutted against the elastic piece, so that the gear 23 slides and resets on the rotating drum 9 and is engaged with the other gear 23, so as to drive the rotating drum 9 to rotate again, and this way can flexibly realize the switching of the rotating state of the rotating drum 9, the structure of the invention is further improved, and the practicability is improved.

The working principle is as follows:

the fluid flows from the liquid inlet channel 2 to the liquid storage cavity 3, then flows from the liquid storage cavity 3 to the liquid outlet channel 4, and finally flows out from the liquid outlet channel 4.

The driving assembly drives the connecting ring 6 to slide, so that the connecting ring 6 drives the piston rod 8 to slide in the liquid storage cavity 3, a negative pressure cavity is formed in the liquid storage cavity 3 at the moment, then an external fluid jacks a blocking ball 5 for blocking a liquid inlet of the liquid inlet channel 2, and then the fluid enters the liquid inlet channel 2 and enters the liquid storage cavity 3, specifically, the rotating drum 9 drives the eccentric ring 10 to rotate, the eccentric ring 10 jacks the inner wall of the connecting ring 6 in the rotating process, so that the connecting ring 6 slides, and the connecting ring 6 drives the piston rod 8 to slide;

then the driving component drives the connecting ring 6 to slide along the opposite direction, and then the connecting ring 6 drives the piston rod 8 to synchronously slide along the opposite direction, at the moment, the pushing plate 21 on the piston rod 8 in the return stroke process of the piston rod 8 pushes the fluid in the liquid storage cavity 3, and then the fluid in the liquid storage cavity 3 pushes the blocking ball 5 for blocking the liquid inlet of the liquid outlet channel 4, so that the fluid flows into the liquid outlet channel 4 from the liquid storage cavity 3 and is discharged from the liquid outlet channel 4, and meanwhile, in the process of the sliding return stroke of the piston rod 8, the fluid in the liquid storage cavity 3 also pushes the blocking ball 5 in the liquid inlet channel 2, so that the blocking ball 5 in the liquid inlet channel 2 slides in the liquid inlet channel 2 and blocks the liquid inlet of the liquid inlet channel 2, thereby completing the fluid conveying process.

When the flow rate of the fluid needs to be adjusted, an operator can adjust the driving assembly by means of the adjusting assembly, so that the driving assembly changes the distance of the stroke of the connecting ring 6, and further the connecting ring 6 changes the stroke of the piston rod 8 synchronously, specifically, the operator holds the rotating handle 17, the rotating handle 17 drives the driving member 12 to rotate, and further the driving member 12 drives the penetrating rod 11 to slide, the penetrating rod 11 moves to drive the connecting block 13 to move, and further the inner wall of the strip-shaped hole 15 on the connecting block 13 pushes the shaft pin 14, so that the shaft pin 14 slides in the penetrating hole 16, the shaft pin 14 slides to drive the eccentric ring 10 to move, and further the distance between the eccentric ring 10 and the rotary drum 9 changes, so that the track of the rotary drum 9 driving the eccentric ring 10 to rotate changes, and after the rotating track of the eccentric ring 10 changes, the stroke of the eccentric ring 10 pushing the connecting ring 6 to move changes, therefore, the stroke of the connecting ring 6 for driving the piston rod 8 to move is changed, after the stroke of the piston rod 8 is changed, the size of the negative pressure cavity formed in the liquid storage cavity 3 is changed, and further the flow rate of the fluid entering the liquid storage cavity 3 is changed, so that the effect of adjusting the flow rate of the fluid is achieved, when the driving assembly is continuously adjusted, the moving stroke of the connecting ring 6 can be continuously changed by the driving assembly, and further the size of the negative pressure cavity formed by the liquid storage cavity 3 can be continuously changed, so that the effect of continuously adjusting the flow rate of the fluid is achieved.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.