阅读说明：本技术 一种全自动可调外喷射自吸泵 (Full-automatic adjustable external injection self-priming pump ) 是由 朱海川 王朝宇 于 2020-12-03 设计创作，主要内容包括：本发明适用于自吸泵技术领域,提供了一种全自动可调外喷射自吸泵,包括泵壳、外喷嘴、内喷嘴等,其中,所述内喷嘴连接在泵壳的中心进水口处,外喷嘴连接在导叶上,所述内喷嘴相对于导叶、外喷嘴相对于中心进水口的位置均可调,使得外喷嘴和内喷嘴间的夹角和过流截面积可调,本发明的有益效果是：对内外喷嘴的夹角和过流截面积进行方便的调节,可在不拆卸泵的前提下调节泵的自吸能力,并进一步根据泵的扬程大小的反馈,来减小自吸回流,调节自吸能力并提高泵的效率,从而实现根据完成自吸后出口压力的变化来自动降低自吸回流,来改变自吸性能并提高泵效率,实现全自动的动态调节功能。(The invention is suitable for the technical field of self-priming pumps, and provides a full-automatic adjustable external injection self-priming pump, which comprises a pump shell, an external nozzle, an internal nozzle and the like, wherein the internal nozzle is connected with a central water inlet of the pump shell, the external nozzle is connected with a guide vane, the positions of the internal nozzle relative to the guide vane and the external nozzle relative to the central water inlet are adjustable, so that the included angle and the flow cross-sectional area between the external nozzle and the internal nozzle are adjustable, and the full-automatic adjustable external injection self-priming pump has the beneficial effects that: the included angle and the flow cross-sectional area of the inner nozzle and the outer nozzle are conveniently adjusted, the self-priming capacity of the pump can be adjusted on the premise that the pump is not detached, the self-priming backflow is reduced further according to the feedback of the pump head size, the self-priming capacity is adjusted, the efficiency of the pump is improved, the self-priming backflow is automatically reduced according to the change of the outlet pressure after the self-priming is completed, the self-priming performance is changed, the efficiency of the pump is improved, and the full-automatic dynamic adjusting function is realized.)

1. The utility model provides a full-automatic adjustable outer injection self priming pump, includes pump case (1), outer nozzle (3) and interior nozzle (4), its characterized in that, the center water inlet department at pump case (1) is connected in interior nozzle (4), and outer nozzle (3) are connected on stator (5), interior nozzle (4) are all adjustable for stator (5), outer nozzle (3) for the position of center water inlet for contained angle and the cross-flow area between outer nozzle and interior nozzle are adjustable.

2. The full-automatic adjustable external jet self-priming pump according to claim 1, wherein a drainage area taper hole (1B) is further formed at the central water inlet of the pump shell (1), an inner nozzle fixing hole (1C) is formed in the end hole wall of the drainage area taper hole (1B), the nozzle fixing hole (1C) is used for being matched with a fixing member to fix the inner nozzle (4), and a connecting round handle matched with the fixing member is arranged on the inner nozzle (4).

3. The full-automatic adjustable external injection self-priming pump of claim 1, characterized in that, be equipped with injection district taper hole (3A) and mixing district straight hole (3B) that set gradually on outer nozzle (3), the tip of mixing district straight hole (3B) is equipped with sliding port (3G), be equipped with on stator (5) with mixing export (5E) of mixing district straight hole (3B) intercommunication, with sliding port (3G) sliding fit's spigot surface (5B), along the flow direction of water, diffusion district taper hole (5A) still are connected with mixing export (5E) of stator (5), the tip of stator (5) is equipped with spacing face (5D) perpendicular with spigot surface (5B).

4. The full-automatic adjustable external jet self-priming pump according to claim 3, wherein the limiting surface (5D) is provided with a screw hole (5C), the outer nozzle (3) is further provided with a locking hole (3E) and a guide groove (3F), and the outer nozzle (3) is locked with the guide surface (5B) by a set screw (52) penetrating through the locking hole (3E).

5. The full-automatic adjustable external injection self-priming pump according to claim 3, wherein a piston guide plate (2) is arranged in the pump casing (1) at a position corresponding to the outer side of the pump casing (1), an elastic cavity is arranged between the piston guide plate (2) and the pump casing (1), the elastic cavity is formed by enclosing a piston cavity (1A) and the piston guide plate (2) which are arranged on the pump casing (1), and an opening at the end part of the piston guide plate (2) is connected with the external nozzle (3).

6. The full-automatic adjustable external jet self-priming pump according to claim 5, wherein a spring (10) is disposed in the elastic cavity, a spring groove (2F) for mounting the spring (10) is disposed on the piston guide plate (2), and a spring fixing groove (1E) is disposed in the piston cavity (1A).

7. The self-priming pump of claim 5 wherein said elastic chamber is a pump housing air pressure chamber (KQ) for storing air.

8. The full-automatic adjustable external injection self-priming pump according to claim 6, characterized in that the pump housing (1) is further provided with a top bolt (11) and a screw (13) whose ends are connected with the piston deflector (2), wherein the pump housing (1) is provided with a pull nut (12) which is matched with the screw (13), and an outer seal ring (8) and an inner seal ring (9) are installed between the piston deflector (2) and the pump housing (1).

9. The full-automatic adjustable external jet self-priming pump according to claim 5, wherein a plurality of drainage blades (2D) are arranged on the end face of the piston guide plate (2), a guide groove (3C) matched with the drainage blade (2D) is further arranged at the corresponding position of the drainage blade (2D) for guiding the flow of the outer nozzle (3), a blade clamping groove (2C) and a clamping groove (3D) are respectively arranged on the surfaces of the drainage blade (2D) and the guide groove (3C), and the blade clamping groove (2C) and the clamping groove (3D) are used for installing a steel wire clamping ring (6) so as to connect the piston guide plate (2) and the outer nozzle (3).

10. The full-automatic adjustable external injection self-priming pump according to claim 9, wherein the inner and outer sides of the piston deflector (2) are respectively provided with an outer seal groove (2A) and an outer seal groove (2B) for installing an outer seal ring (8) and an inner seal ring (9), and further provided with a screw hole (2E) connected with a top bolt (11) and a screw rod (13), and a piston cavity (1A) for installing the piston deflector (2) and an adjusting hole (1D) for installing the screw rod (13) and the top bolt (11) are provided at a corresponding position of the pump housing (1).

Technical Field

The invention relates to a self-sucking pump, in particular to a full-automatic adjustable external-injection self-sucking pump.

Background

The jet self-priming pump has the characteristics of strong self-priming capability, high self-priming height, low cavitation allowance, high closing lift and convenient use, and is widely applied.

The existing market generally adopts an internal injection mode, an inlet enters the center of a pump according to a Z shape on the center of a pump shaft, the low-flow pump is easy to realize, the cost cannot be greatly influenced, the cost of the high-flow pump is greatly influenced and is relatively complex, and the Z shape entering greatly increases the resistance of the inlet of the pump and reduces the efficiency of the pump. And the current spray self-priming pumps on the market can not be adjusted, and can not automatically adjust the self-priming capacity of the pump or close the self-priming capacity according to the application occasions of the pump.

Disclosure of Invention

The embodiment of the invention aims to provide a full-automatic adjustable external injection self-priming pump, aiming at solving the technical problems in the prior art determined in the background technology.

The embodiment of the invention is realized in such a way that the full-automatic adjustable external injection self-priming pump comprises a pump shell, an outer nozzle and an inner nozzle, wherein the inner nozzle is connected to a central water inlet of the pump shell, the outer nozzle is connected to a guide vane, the positions of the inner nozzle relative to the guide vane and the outer nozzle relative to the central water inlet are adjustable, and the included angle and the flow cross-sectional area between the outer nozzle and the inner nozzle are adjustable.

As a further scheme of the invention: the pump shell is characterized in that a drainage area taper hole is further formed in the central water inlet of the pump shell, an inner nozzle fixing hole is formed in the hole wall of the end portion of the drainage area taper hole, the nozzle fixing hole is used for being matched with a fixing piece to fix the inner nozzle, and a connecting round handle matched with the fixing piece is arranged on the inner nozzle.

As a still further scheme of the invention: be equipped with the injection zone taper hole and the straight hole of mixed zone that set gradually on the outer nozzle, the tip of the straight hole of mixed zone is equipped with the slip mouth, be equipped with on the stator with the mixed export of the straight hole intercommunication of mixed zone, along the flow direction of water, the diffusion zone taper hole still with the mixed exit linkage of stator, the tip of stator be equipped with the spacing face of spigot surface vertically.

As a still further scheme of the invention: the limiting surface is provided with a screw hole, the outer nozzle is further provided with a locking hole and a guide groove, and the outer nozzle is locked with the guide surface through a set screw penetrating through the locking hole.

As a still further scheme of the invention: the pump comprises a pump shell, a piston guide plate is arranged in the pump shell at a position corresponding to the outer side of the pump shell, an elastic cavity is arranged between the piston guide plate and the pump shell, the elastic cavity is formed by enclosing a piston cavity and the piston guide plate which are arranged on the pump shell, and an opening at the end part of the piston guide plate is connected with the outer nozzle.

As a still further scheme of the invention: the piston guide plate is provided with a spring groove for mounting the spring, and a spring fixing groove is formed in the piston cavity.

As a still further scheme of the invention: the elastic cavity is a pump shell air pressure cavity which is used for storing air.

As a still further scheme of the invention: the pump shell is also provided with a top bolt and a screw rod, the end part of the top bolt is connected with the piston guide plate, the pump shell is provided with a pull nut matched with the screw rod, and an outer sealing ring and an inner sealing ring are arranged between the piston guide plate and the pump shell.

As a still further scheme of the invention: the end face of the piston guide plate is provided with a plurality of drainage blades, the corresponding positions of the drainage blades, which are used for guiding the outer nozzle, are also provided with guide grooves matched with the drainage blades, the surfaces of the drainage blades and the guide grooves are respectively provided with blade clamping grooves and clamping grooves, and the blade clamping grooves and the clamping grooves are used for installing steel wire clamping rings so as to connect the piston guide plate and the outer nozzle.

As a still further scheme of the invention: the inner side and the outer side of the piston guide plate are respectively provided with an outer sealing groove used for installing an outer sealing ring and an inner sealing ring, and are also provided with screw holes connected with the top bolt and the screw rod, and the corresponding position of the pump shell is provided with a piston cavity used for installing the piston guide plate and an adjusting hole used for installing the screw rod and the top bolt.

Compared with the prior art, the invention has the beneficial effects that: the self-priming device has the advantages that the included angle and the overflowing area of the inner nozzle and the outer nozzle are conveniently adjusted, the self-priming capacity of the pump can be adjusted on the premise that the pump is not detached, the self-priming backflow is reduced further according to the feedback of the pump head size, the self-priming capacity is adjusted, the efficiency of the pump is improved, the self-priming backflow is automatically reduced according to the change of the outlet pressure after the self-priming is completed, the self-priming performance is changed, the efficiency of the pump is improved, and the full-automatic dynamic adjusting function is achieved. By adopting the modularized design, different part combinations can be used, and different adjusting functions can be realized according to market demands.

Drawings

Fig. 1 is a schematic structural diagram of a fully automatic adjustable external injection self-priming pump.

Fig. 2 is a schematic view of the adjustment of the inner nozzle in embodiment 1.

Fig. 3 is a schematic view of the adjustment of the outer nozzle in embodiment 2.

FIG. 4 is a sectional view of scheme I.

Fig. 5 is a schematic view of the pump casing.

Fig. 6 is a schematic diagram of a piston baffle configuration.

Fig. 7 is a schematic structural view of the outer nozzle.

Fig. 8 is a schematic structural view of a guide vane.

Fig. 9 is a schematic view of the connection of the piston baffle to the outer nozzle.

Fig. 10 is a schematic diagram of the automatic adjustment of the outer nozzle in scheme I.

FIG. 11 is a schematic view of the automatic adjustment of the outer nozzle in the embodiment II-2.

FIG. 12 is a schematic view of the automatic adjustment of the outer nozzle in the embodiment II-3.

In the drawings: 1-pump shell, 2-piston guide plate, 3-outer nozzle, 4-inner nozzle, 5-guide vane, 6-steel wire retainer ring, 7-guide screw, 8-outer seal ring, 9-inner seal ring, 10-spring, 11-top bolt, 12-pull nut, 13-screw, 20-impeller, 21-back cover, 22-bearing support, 23-pump shaft, 24-machine seal, 25-front bearing, 26-back bearing, 27-impeller front opening ring, 28-pump shell front opening ring, 29-impeller back opening ring, 30-pump shell back opening ring, 31-shaft head nut, 32-gasket, 33-shaft snap spring, 34-bearing retainer ring, 35-water retaining ring, 36-pump cover bolt, 37-water injection plug bolt, 38-waterproof plug, 51-sealing plug, 52-set screw.

A-the direction of water jet flow and B-the direction of water flow at the inlet of the pump;

an-the included angle between the outer nozzle and the inner nozzle, t-the adjusting distance of the inner nozzle, X-the adjusting distance of the outer nozzle, Kn-the diffusion angle of the guide vane, Fw-water pressure and KQ-the air pressure cavity of the pump shell;

1A-a piston cavity, 1B-a drainage area taper hole, 1C-an inner nozzle fixing hole, 1D-an adjusting hole and 1E-a spring fixing groove;

2A-an outer sealing groove, 2B-an inner sealing groove, 2C-a blade clamping groove, 2D-a drainage blade, a 2E-screw hole and a 2F-spring groove;

3A-a spray zone taper hole, 3B-a mixing zone straight hole, 3C-a guide groove, a 3D-a clamping groove, a 3E-a locking hole, a 3F-a guide groove and a 3G-a sliding port;

5A-diffusion zone taper hole, 5B-guide surface, 5C-screw hole, 5D-spacing surface and 5E-mixing outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

As shown in fig. 1 to 3, a structure diagram of a full-automatic adjustable external injection self-priming pump provided in an embodiment of the present invention includes a pump casing 1, an external nozzle 3, an internal nozzle 4, a guide vane 5, an impeller 20, a rear cover 21, a bearing bracket 22, a pump shaft 23, a mechanical seal 24, a front bearing 25, a rear bearing 26, an impeller front opening ring 27, a pump casing front opening ring 28, an impeller rear opening ring 29, a pump casing rear opening ring 30, a spindle nose nut 31, a gasket 32, a shaft snap spring 33, a bearing retainer ring 34, a water retaining ring 35, a 3 pump cover bolt 36, a water injection plug 37, a waterproof plug 38, a sealing plug 51, and a set screw 52; the rear cover 21 is fixed on the pump shell 1 by a pump cover bolt 36 and compresses the guide vane 5 to be positioned in the pump shell 1; a front bearing 25 and a rear bearing 26 are arranged in the bearing bracket 22 and connected to the rear cover 21; the impeller 20 is arranged on the pump shaft 23 and is locked by a spindle nose nut 31 and a gasket 32, the pump shaft 23 is arranged on a front bearing 25 and a rear bearing 26 and is axially positioned by a shaft clamp spring 33 and a bearing retainer ring 34 but can freely rotate; the front end of the impeller 20 is provided with a detachable impeller front opening ring 27, and the rear end is provided with a detachable impeller rear opening ring 29; a pump shell front opening ring 28 is mounted on the guide vane 5, and a gap of 0.1-0.8 mm is reserved between the pump shell front opening ring and the impeller front opening ring 27; a pump shell rear opening ring 30 is arranged on the rear cover 21, and a gap of 0.1-0.8 mm is formed between the pump shell rear opening ring and the impeller rear opening ring 29; a mechanical seal 24 for preventing leakage is arranged on the pump shaft 23 and in the rear cover 21 behind the impeller 20; a water retaining ring 35 is arranged on the pump shaft 23 between the mechanical seal 24 and the front bearing 25; the pump shell 1 is provided with a water injection plug 37, and the lower part of the pump shell 1 is provided with a water discharge plug 38.

The inner nozzle 4 is connected to a central water inlet of the pump shell 1, the outer nozzle 3 is connected to the guide vane 5, and the positions of the inner nozzle 4 relative to the guide vane 5 and the position of the outer nozzle 3 relative to the central water inlet are adjustable, so that the included angle An and the flow cross-sectional area between the outer nozzle and the inner nozzle are adjustable.

As shown in fig. 5, specifically speaking, the central water inlet of the pump case 1 is further provided with a drainage area taper hole 1B, the end hole wall of the drainage area taper hole 1B is provided with an inner nozzle fixing hole 1C, the nozzle fixing hole 1C is used for being matched with a fixing part to fix the inner nozzle 4, specifically, the inner nozzle 4 is provided with an outer thread round handle matched with the fixing part, after being loosened and tightened, the position of the inner nozzle 4 can be adjusted, then the inner nozzle 4 is fixed, the position of the inner nozzle 4 is adjusted, and the adjusting distance of the inner nozzle is t.

As shown in fig. 7 and 8, for the outer nozzle 3, the outer nozzle 3 is provided with an injection region taper hole 3A and a mixing region straight hole 3B which are sequentially arranged, the end of the mixing region straight hole 3B is provided with a sliding port 3G, the guide vane 5 is provided with a guide surface 5B (the diffusion angle Kn of the guide vane 5 is within 0 to 30 °) which is in sliding fit with the sliding port (3G), along the flow direction of water, the diffusion region taper hole 5A is further connected with a mixing outlet 5E of the guide vane 5, the end of the guide vane 5 is provided with a limit surface 5D perpendicular to the guide surface 5B, the limit surface 5D is provided with a screw hole 5C, the outer nozzle 3 is further provided with a locking hole 3E and a guide groove 3F, the outer nozzle 3 is connected with the guide surface 5B by a set screw 52 which passes through the locking hole 3E, when the position of the outer nozzle 3 needs to be adjusted, the set screw 52 is loosened so that the outer nozzle 3 can slide along the guide surface 5B, after the adjustment is completed, the set screw 52 is tightened, the adjustment stroke is the adjustment distance X of the outer nozzle 3, so that the included angle An between the outer nozzle 3 and the inner nozzle 4 in the injection zone is within 3-45 degrees, and the change of the adjustment distance X changes the flow cross-sectional area between the outer nozzle 3 and the inner nozzle 4, namely the self-priming capability.

In addition, in the present embodiment, the inner nozzle 4 and the outer nozzle 3 can be replaced to adopt different included angles An to realize different flow rates, so that the center end suction, the inner nozzle and the outer nozzle adjustable and replaceable outer jet self-suction are realized.

Example 2

The invention also provides a mode of adjusting the included angle An and the flow cross-sectional area between the outer nozzle 3 and the inner nozzle 4, in particular to An adjusting mode of the outer nozzle 3:

scheme I:

as shown in fig. 4, a piston deflector 2 is arranged in the pump case 1 at a position corresponding to the outer side of the pump case 1, the pump case 1 is further provided with a top bolt 11 and a screw 13, the ends of which are connected with the piston deflector 2, wherein the pump case 1 is provided with a pull nut 12 matched with the screw 13, an outer sealing ring 8 and an inner sealing ring 9 are arranged between the piston deflector 2 and the pump case 1, and an opening at the end of the piston deflector 2 is connected with the outer nozzle 3. Here, the outer nozzle 3 is only slidably fitted to the guide surface 5B and is not fixed by the set screw 52.

The specific connection mode is as follows:

as shown in fig. 6, be equipped with a plurality of drainage blade 2D on piston guide plate 2's the terminal surface, drainage blade 2D is used for the water conservancy diversion for 4 spun mediums of interior nozzle can be convenient enter into outer nozzle 3 in, outer nozzle 3's the corresponding position department still be equipped with drainage blade 2D matched with guide slot 3C, drainage blade 2D and guide slot 3C's surface is equipped with blade draw-in groove 2C and draw-in groove 3D respectively, blade draw-in groove 2C and draw-in groove 3D are used for installing steel wire rand 6, in order to realize being connected of piston guide plate 2 and outer nozzle 3.

It should be noted that the piston deflector 2 is provided with outer seal grooves 2A and 2B for mounting the outer seal ring 8 and the inner seal ring 9, respectively, on the inner and outer sides thereof, and further provided with screw holes 2E for connecting with the top bolt 11 and the screw 13. Correspondingly, a piston cavity 1A for installing a piston guide plate 2 and an adjusting hole 1D for installing a screw 13 and a top bolt 11 are arranged at the corresponding position of the pump shell 1.

As shown in fig. 10, during actual assembly, the outer nozzle 3 enters along the axis of the guide surface 5B of the guide vane upper 5, is limited to the limiting surface 5D of the guide vane 5, and is limited to rotate by the guide screw 7 fixed to the screw hole 5C, and here, the outer nozzle 3 is provided with a guide groove 3F for abdicating the guide screw 7; the guide vanes 2D on the piston guide plate 2 are inserted along the guide grooves 3C of the outer nozzles 3 and are clamped in the vane clamping grooves 2C on the piston guide plate 2 and the clamping grooves 3D of the outer nozzles 3 by the steel wire clamping rings 6, so that the piston guide plate 2 and the outer nozzles 3 are connected into a whole; the screw 13 is fixed in a screw hole 2E on the piston guide plate 2 and can pull out the piston guide plate 2 towards the inlet; the pull nut 12 is screwed on the screw rod 13; the top bolt 11 is against the piston guide plate 2, and can be pushed into the piston guide plate 2 along the direction of the impeller 20, and then the outer sealing ring 8 and the inner sealing ring 9 are arranged in the outer sealing groove 2A and the inner sealing groove 2B on the piston guide plate 2.

In practical use, by unscrewing the top bolt 11 and turning the draw nut 12 on the outside, the screw 13 can be pulled out along the central water inlet and bring the piston deflector 2 and the outer nozzle 3 together, thus achieving the capability of external adjustment, also X, whose maximum distance allows the outer nozzle 3 to rest completely against the inner nozzle 4, i.e. closing the water jet a.

Scheme II: further, on the basis of the scheme I, an elastic cavity is arranged between the piston guide plate 2 and the pump shell 1, the elastic cavity is formed by enclosing the piston cavity 1A arranged on the pump shell 1 and the piston guide plate 2, and the elastic cavity is arranged to achieve a better adjusting effect on the piston guide plate 2 and the outer nozzle 3.

As shown in FIG. 10, scheme II-1: further, on the basis of the scheme I, the spring 10 is additionally arranged between the piston guide plate 2 and the pump shell 1, namely the spring 10 is arranged in the elastic cavity, and the spring 10 has a certain boosting effect. Correspondingly, a spring groove 2F for installing the spring 10 is arranged on the piston guide plate 2, and a spring fixing groove 1E is arranged in the piston cavity 1A.

As shown in FIG. 11, scheme II-2: furthermore, on the basis of the scheme II-1, the embodiment cancels the top bolt 11, the screw 13 and the pull nut 12 in the scheme I, and realizes the automatic adjustment of X by the elastic force of the spring 10, specifically, the working principle is as follows:

when the pump starts self-priming, the pressure (lift) of the pump is very low, the water pressure Fw acting on the piston guide plate 2 is synchronously very low, the spring 10 pushes the piston guide plate 2 and the outer nozzle 3 to reach the limiting surface 5D of the guide vane 5, and the adjusting distance X is 0 at the moment; when the pump starts to perform self-priming, and the inlet pipeline of the pump is filled with water, the pressure (lift) of the pump is increased, the water pressure Fw acting on the piston guide plate 2 is synchronously increased, so that the spring 10 is compressed, and the adjusting distance X is increased; when the pressure (lift) of the pump is highest, the water pressure Fw acting on the piston guide plate 2 is the largest, so that the spring 10 is compressed, and the adjusting distance X is the largest at the moment, namely the state of closing the water jet A is achieved; if the pressure (lift) of pump reduces, then Fw reduces in step, and spring 10 resumes to promote outer nozzle 3, and the regulation distance X reduces this moment to open water jet A, this same trend of change that just realizes pump internal pressure (lift) and regulation distance X, thereby realize the full automatically regulated of intelligence, and improve the efficiency of pump.

As shown in FIG. 12, scheme II-3: the elastic cavity in this embodiment is a pump case air pressure cavity KQ for storing air therein, and certainly, to the original adjusting hole 1D for installing the screw 13 and the top bolt 11 on the pump case 1, the sealing plug 51 needs to be used for sealing or plugging, and at this time, the pump case air pressure cavity KQ serves as the spring 10, and intelligent full-automatic adjustment can be realized as well.

The embodiment of the invention discloses a full-automatic adjustable external injection self-priming pump, which can conveniently adjust the included angle An and the flow cross-sectional area of An internal nozzle and An external nozzle, can adjust the self-priming capability of the pump on the premise of not disassembling the pump, further reduce self-priming backflow according to the feedback of the pump head size, adjust the self-priming capability and improve the pump efficiency, thereby realizing the automatic reduction of the self-priming backflow according to the change of the outlet pressure after the self-priming is finished, changing the self-priming performance and improving the pump efficiency, and realizing the full-automatic dynamic adjustment function. By adopting the modularized design, different part combinations can be used, and different adjusting functions can be realized according to market demands.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.