CN110894830A

CN110894830A - Booster water pump

Info

Publication number: CN110894830A
Application number: CN201911403252.8A
Authority: CN
Inventors: 陈艳艳
Original assignee: Ningbo Wen Fan Electrical And Mechanical Technology Development Co Ltd
Current assignee: Ningbo Wen Fan Electrical And Mechanical Technology Development Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-03-20

Abstract

The invention belongs to the technical field of water pumps. The invention discloses a booster water pump which comprises a shell and a piston, wherein a control cavity and a working cavity are arranged in the shell, a P port, a T port, a water inlet and a water outlet are arranged on the shell, the control cavity is divided into a left control cavity and a right control cavity by the large end of the piston, the P port and the T port are alternately communicated with the left control cavity and the right control cavity so as to drive the piston to axially reciprocate, the small end of the piston is positioned in the working cavity, and the water inlet and the water outlet are communicated with the working cavity; when the piston linearly moves to the terminal position along the control cavity in an axial reciprocating manner, the piston rotates in the circumferential direction to complete the switching of the communication relation between the P port and the T port and between the left control cavity and the right control cavity, and therefore continuous compression work and output of water by the working cavity are achieved. The booster water pump has the advantages of higher working reliability and stability, more compact structure and lower maintenance and use cost.

Description

Booster water pump

Technical Field

The invention belongs to the technical field of water pumps, and particularly relates to a booster water pump.

Background

The booster water pump is an important high-pressure water source providing element widely applied to the fields of water cutting, high-pressure cleaning and the like. At present, the traditional booster water pump adopted in China controls the booster water pump to reciprocate and continuously output high-pressure water through continuous reversing of an electromagnetic reversing valve.

Traditional booster water pump, not only the structure is complicated, need set up complicated displacement sensor and automatically controlled components and parts, the switching-over is unstable moreover, unreliable. Meanwhile, the control circuit part of the reversing device adopts circuit board control, and the circuit board is a non-standard part and is difficult to manufacture and process, so that the damaged circuit board is very difficult to maintain. In addition, if the existing reversing device is continuously electrified for a long time, small devices are easily damaged, the requirement of long-time electrification cannot be met, and the production efficiency is influenced to a certain extent.

Disclosure of Invention

In order to solve the problems of poor working stability and high use and maintenance cost of the traditional booster water pump, the invention provides a booster water pump with a brand new structure. The booster water pump comprises a shell and a piston; a control cavity and a working cavity are arranged inside the shell, a port P, a port T, a water inlet and a water outlet are arranged on the shell, the port P and the port T are communicated with the control cavity, and the water inlet and the water outlet are communicated with the working cavity;

the piston is axially divided into a large end and a small end, the large end of the piston is positioned in the control cavity and divides the control cavity into a left control cavity and a right control cavity, and the small end of the piston is positioned in the working cavity; when the port P is communicated with the left control cavity, the port T is communicated with the right control cavity, and the piston axially moves towards the direction of the right control cavity; when the port P is communicated with the right control cavity, the port T is communicated with the left control cavity, and the piston axially moves towards the direction of the left control cavity;

when the large end of the piston axially reciprocates in the control cavity to a terminal position, the piston rotates in the circumferential direction to complete the communication relation switching of the port P and the port T with the left control cavity and the right control cavity.

Preferably, the outer surface of the large end of the piston is provided with a first oil groove and a second oil groove which are axially formed, and the first oil groove and the second oil groove are symmetrically distributed along the circumferential direction; the first oil groove axially communicates with the left control cavity, the second oil groove axially communicates with the right control cavity, the first oil groove is communicated with the P port, the second oil groove is communicated with the T port, and the first oil groove is communicated with the T port, and the second oil groove is communicated with the P port.

Further preferably, the booster water pump is further provided with a rotation control lever and a control member, and a rotation groove is provided at one end of the housing;

the two ends of the rotating control rod are respectively a steering end and a stress end; the steering end of the rotating control rod is positioned in the rotating groove and can slide relatively along the rotating groove to form rotation of the rotating control rod around the circumferential direction; the stress end of the rotary control rod is inserted into the small end of the piston along the axial direction, and the rotary control rod and the piston form sliding connection along the axial direction and limiting connection along the circumferential direction;

the control piece is in contact connection with the steering end of the rotating control rod and controls the relative sliding of the steering end of the rotating control rod in the rotating groove.

Further preferably, the control member is an elastic member, and a closed cavity is arranged between the force bearing end of the rotating control rod and the small end of the piston;

the rotary groove consists of two left spiral slideways and two right spiral slideways along the axial direction, and the two left spiral slideways and the two right spiral slideways are sequentially connected end to end in an alternating manner along the axial projection to form a complete circumference;

the control piece is positioned between the shell and the steering end of the rotating control rod and forms elastic acting force pointing to the stress end of the rotating control rod; the closed cavity is communicated with the port P and the port T alternately to form a hydraulic acting force for the rotating control rod to point to the steering end of the rotating control rod;

the end that turns to of rotary control pole is under the combined action of elastic force and hydraulic pressure effort, follows respectively left side spiral slideway with right side spiral slideway carries out the relative slip, forms rotary control pole is around the rotation of circumferencial direction.

Further preferably, the booster water pump is also provided with a rotary end cover and a rotary cap; the rotary end cover and the rotary cap are sequentially detachably fixed at one end of the working cavity of the shell along the axial direction, the right spiral slideway is located on the rotary end cover, and the left spiral slideway is located on the rotary cap.

Further preferably, two sections still be equipped with the supplementary spiral slideway in left side between the spiral slideway in left side, two sections still be equipped with the supplementary spiral slideway in right side between the spiral slideway in right side, and the spiral slideway in left side the supplementary spiral slideway in left side the spiral slideway in right side with the supplementary spiral slideway in right side forms along the crisscross form of the upper and lower tooth of axial.

Preferably, the piston is provided with a first oil path and a second oil path, and the shell is provided with a third oil path; one end of the first oil way is communicated with the closed cavity, and the other end of the first oil way is selectively communicated with the port P; one end of the second oil way is communicated with the closed cavity, the other end of the second oil way is selectively communicated with the third oil way, and the third oil way is communicated with a T port; when the large end of the piston axially reciprocates in the control cavity to a terminal position, the first oil way is communicated with the port P, and the second oil way is disconnected with the third oil way; when the large end of the piston axially reciprocates in the control cavity, the first oil way is disconnected with the port P, and the second oil way is communicated with the third oil way.

Preferably, the housing is provided with two auxiliary oil holes, and the outer surface of the large end of the piston is provided with two annular oil grooves; the two auxiliary oil holes are distributed on two sides of the port P along the axial direction and are communicated with the port P; the two annular oil grooves are respectively positioned at two ends of the large end of the piston and are simultaneously communicated with the first oil way; when the large end of the piston axially reciprocates in the control cavity to a terminal position, the auxiliary oil way is communicated with the annular oil groove to form communication between the P port and the first oil way.

Preferably, the shell is provided with an auxiliary oil groove; the auxiliary oil grooves are distributed in the contact area between the small end of the piston and the shell along the axial direction and are communicated with the third oil passage; and when the large end of the piston axially reciprocates in the control cavity, the auxiliary oil groove is communicated with the third oil path.

Preferably, the booster water pump is also provided with a positioning assembly and a guide rod; the guide rod is fixed on the shell along the axial direction, and the large end of the piston is sleeved on the guide rod; the positioning assembly is positioned between the piston and the guide rod; the positioning assembly consists of a positioning hole, a positioning spring, a positioning ball and a guide groove, wherein the guide groove and the positioning hole are respectively positioned at the large end of the piston and the outer surface of the guide rod, the guide groove is axially distributed, the positioning hole is radially formed, and the positioning spring and the positioning ball are positioned in the positioning hole; when the piston rotates in the circumferential direction in the control cavity, the positioning ball compresses the positioning spring to be positioned in the positioning hole; when the piston moves back and forth in the control cavity in the axial direction, one end of the positioning ball is located in the positioning hole, and the other end of the positioning ball is located in the guide groove.

Compared with the booster water pump with the existing structure, the booster water pump has the following beneficial technical effects:

1. in the invention, the outer surface of the big end of the piston is provided with the first oil groove and the second oil groove along the axial direction, the first oil groove and the second oil groove are symmetrically distributed along the circumferential direction, one end of the rotary control rod is connected with the rotary groove, and the other end of the rotary control rod is in axial sliding connection with the piston. At this moment, with the help of first oil groove and second oil groove respectively with the intercommunication of high-pressure fluid and low pressure fluid, can guarantee that the piston carries out stable axial reciprocating motion, rotate along the relative circumferencial direction that the swivelling chute formed with the help of the steering control pole simultaneously to drive the piston and carry out the circumferencial direction and rotate, make first oil groove and second oil groove and high-pressure fluid and the intercommunication relation of low pressure fluid switch, thereby realize the automatic round trip movement of piston, and then realize doing work and exporting to the compression of working chamber normal water. Therefore, the use of a reversing valve, a sensor and a circuit board in the existing booster water pump is omitted, and the problems of instability and unreliability of long-time continuous work of electrical elements and high later maintenance cost are solved, so that the stability and reliability of the booster water pump in long-time continuous work under the drive of hydraulic oil are realized, the number of parts is reduced, and the volume and the use and maintenance cost of the whole booster water pump are reduced.

2. In the invention, a rotary groove consisting of a left spiral slideway and a right spiral slideway along the axial direction is adopted, and an oil way, an oil hole and an oil groove which are used for respectively realizing the communication among the P port, the T port and the closed cavity in each action process of the piston are arranged on the shell and the piston. Therefore, the pressure of oil in the closed cavity can be directly changed through on-off change between oil passages in the moving process of the piston, so that the rotating action that the rotary control rod drives the piston is automatically completed according to the change of the oil pressure, and the rotary control rod slides along the left spiral slideway and the right spiral slideway successively in the process of turning the piston each time, so that the rotary control rod continuously slides in the same direction in the rotary groove, and the piston can continuously and smoothly rotate in the reciprocating moving process, and further the smoothness and the stability of continuous reciprocating axial movement of the piston are ensured.

Drawings

FIG. 1 is a schematic cross-sectional view illustrating a process of moving a piston to the right control chamber in the booster water pump according to the embodiment;

FIG. 2 is a schematic cross-sectional view illustrating a piston moving to the right control chamber to the terminal in the booster water pump according to the embodiment;

FIG. 3 is a schematic sectional view illustrating a process of moving the piston to the left control chamber in the booster water pump according to the embodiment;

FIG. 4 is a schematic cross-sectional view illustrating the piston moving to the terminal side toward the left control chamber in the booster water pump according to the embodiment;

FIG. 5 is a schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 6 is a schematic sectional view along the direction A-A in FIG. 1 illustrating a reversing process of a piston in the booster water pump according to the embodiment at a position of a right control chamber terminal;

FIG. 7 is a schematic sectional view taken along the direction A-A in FIG. 1 after a piston in the booster water pump of the present embodiment completes reversing at a terminal position of a right control chamber;

FIG. 8 is a schematic structural diagram of the rotating lever according to the present embodiment;

FIG. 9 is a schematic view of the position relationship between the rotating lever and the rotating slot at the moment shown in FIG. 6;

FIG. 10 is a schematic view of the position relationship between the rotating lever and the rotating slot at the moment shown in FIG. 7;

FIG. 11 is a schematic view of the configuration of the rotary end cap in this embodiment;

FIG. 12 is a schematic structural diagram of the external shape of the rotary cap in the present embodiment;

fig. 13 is a partial structural view illustrating the positioning assembly circumferentially positioning the piston and the guide rod in this embodiment.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the booster water pump of the present embodiment includes a housing 1 and a piston 2. A control chamber and a working chamber 12 are arranged in the interior of the housing 1 and distributed in the axial direction. A P port, a T port, a water inlet 13 and a water outlet 14 are arranged on the shell 1, the P port and the T port are communicated with the control cavity, and the water inlet 13 and the water outlet 14 are communicated with the working cavity 12. Wherein, corresponding one-way valves are respectively arranged at the water inlet 13 and the water outlet 14, so that the low-pressure water flows into the working cavity 12 in one way through the water inlet 13 and the high-pressure water flows out of the working cavity 12 in one way through the water outlet 14.

The piston 2 is divided into a large end and a small end in the axial direction. The large end of the piston 2 is located in the control chamber and divides the control chamber into a left control chamber 111 and a right control chamber 112, and the small end of the piston 1 is located in the working chamber 12 and separates the control chamber from the working chamber 12. When the port P is communicated with the left control chamber 111, the port T is communicated with the right control chamber 112, the high-pressure oil flows into the left control chamber 111, and the piston 2 axially moves toward the right control chamber 112. When the port P is communicated with the right control chamber 112, the port T is communicated with the left control chamber 111, the high-pressure oil flows into the right control chamber 112, and the piston 1 axially moves in the direction of the left control chamber 111.

When the big end of the piston 2 axially reciprocates in the control cavity to the terminal position, the piston 2 rotates around the circumferential direction, the communication relation switching between the port P and the port T and the left control cavity 111 and the right control cavity 112 is completed, and the steering switching of the high-pressure oil to the driving direction of the piston is completed, so that the axial reciprocating movement of the small end of the piston 2 in the working cavity 12 is realized, and further the continuous compression work and the output of low-pressure water in the working cavity 12 are completed.

Preferably, as shown in fig. 1, in the present embodiment, the large end of the piston 2 is a cylindrical structure, and the outer surface of the large end is provided with a first oil groove 21 and a second oil groove 22 which are opened along the axial direction, and the first oil groove 21 and the second oil groove 22 are symmetrically distributed along the circumferential direction. First oil groove 21 keeps the intercommunication along axial and left control chamber 111, and second oil groove 22 keeps the intercommunication along axial and right control chamber 112 to when first oil groove 21 communicates with the P mouth, second oil groove 22 and T mouth intercommunication, when first oil groove 21 communicates with the T mouth, second oil groove 22 and P mouth intercommunication.

Therefore, in the process of axial movement of the piston, the first oil groove and the second oil groove which are axially formed can be used for keeping the P port and the T port to be stably communicated with the left control cavity and the right control cavity respectively, and after the piston moves to the terminal along the axial direction and turns around in the circumferential direction, the communication relation between the first oil groove and the second oil groove and the P port and the communication relation between the first oil groove and the second oil groove and the T port are switched, so that the axial movement in the opposite direction can be continued, and the reciprocating movement of the piston along the axial direction can be realized.

As shown in fig. 8 to 10 in conjunction with fig. 1, in the booster water pump of the present embodiment, a rotation control lever 3 and a control member 4 are further provided, and a rotation groove 5 is provided at one end of the working chamber in the housing 1.

The two ends of the rotating control rod 3 are respectively a steering end and a stress end. Wherein, the turning end of the rotating control rod 3 is positioned in the rotating groove 5 and can slide relatively along the rotating groove 5, thereby forming the rotation of the rotating control rod 3 around the circumferential direction. The force bearing end of the rotary control rod 3 is inserted into the small end of the piston 2 along the axial direction, and a sliding connection along the axial direction and a limiting connection along the circumferential direction are formed between the rotary control rod 3 and the piston 2, namely, the relative sliding along the axial direction and the synchronous rotation along the circumferential direction between the rotary control rod 3 and the piston 2 are realized.

The control member 4 is connected to the turning end of the rotating control rod 3 in an axially contacting manner, and controls the turning end of the rotating control rod 3 to relatively slide along the rotating groove 5, thereby controlling the rotation of the piston 2 in the circumferential direction.

Preferably, in this embodiment, the control member 4 is an elastic member, such as a coil spring, and a closed cavity 6 is formed between the force-bearing end of the rotary control rod 3 and the small end of the piston 2. Meanwhile, along the axial direction, the rotary groove 5 is composed of two sections of left-side spiral slideways 51 and two sections of right-side spiral slideways 52, and along the axial projection, the two sections of left-side spiral slideways 51 and the two sections of right-side spiral slideways 52 are sequentially connected end to end in turn along the circumferential direction and form a complete circumference.

The control member 4 is located between the housing 1 and the turning end of the rotary control lever 3 and exerts an elastic force directed towards the force-bearing end of the rotary control lever 3. The closed cavity 6 is communicated with the port P and the port T alternately to form hydraulic acting force pointing to the steering end of the rotating control rod 3.

In this embodiment, the turning end of the rotating control rod 3 is provided with two guide tables 31 in the radial direction, and the guide tables 31 are located in the rotating slot 5, thereby forming a sliding connection of the turning end of the rotating control rod 3 with the rotating slot 5. Meanwhile, the stress end of the rotary control rod 3 is of a cylindrical structure, an axial inner chute 23 is arranged at the small end of the piston 2, and a flat key 32 is arranged on the outer surface of the stress end of the rotary control rod 3, so that the axial sliding connection between the rotary control rod 3 and the piston 2 and the synchronous circumferential rotation of the piston 2 driven by the rotary control rod 3 are realized by means of axial guiding and circumferential limiting between the flat key 32 and the inner chute 23. Similarly, in other embodiments, according to design and machining requirements, the force-bearing end of the rotary control rod can also be directly designed into an outer polygonal structure, and a corresponding inner polygonal hole is arranged at the small end of the piston, so that relative sliding in the axial direction and synchronous rotation in the circumferential direction between the rotary control rod and the piston are met.

At this time, the guide table 31 can slide along the left spiral chute 51 and the right spiral chute 52 by the combined action of the elastic force and the hydraulic force, and the rotation of the rotary control rod 3 in the circumferential direction is formed. When the closed cavity is communicated with the T port and the elastic acting force is larger than the hydraulic acting force, the guide table 31 on the rotary control rod 3 is contacted with the right spiral slideway 52 and slides relatively along the right spiral slideway 52. When the closed cavity is communicated with the port P and the hydraulic acting force is larger than the elastic acting force, the guide table 31 on the rotating control rod 3 is contacted with the left spiral slideway 51 and slides relatively along the left spiral slideway 51.

As shown in fig. 9 and 10, a left auxiliary screw chute 51a is provided between the two left screw chutes 51, and a right auxiliary screw chute 52a is provided between the two right screw chutes 52. At this time, the rotary groove 5 composed of the left spiral slideway 51, the left auxiliary spiral slideway 51a, the right spiral slideway 52 and the right auxiliary spiral slideway 52a forms a form of mutual staggering of upper and lower teeth along the axial direction, so that the guide table 31 moves in the rotary groove 5 along the same direction in the circumferential direction, thereby ensuring that the piston 2 rotates along one direction, and achieving the accurate and rapid rotation reversing effect.

In this embodiment, the elastic member controls the guiding table in the rotary control rod to respectively slide relative to the left spiral slideway and the right spiral slideway in the rotary groove according to the magnitude relation between the oil-hydraulic pressure in the closed cavity and the oil-hydraulic pressure in the closed cavity.

As shown in fig. 1, 11 and 12, in the booster water pump of the present embodiment, a rotary cover 7 and a rotary cover 8 are further provided. Wherein, the rotary end cover 7 and the rotary cap 8 are detachably fixed at one end of the working cavity of the housing 2 along the axial direction in sequence, for example, by adopting a screw connection. Meanwhile, the right spiral slideway 51 is arranged on the rotary end cover 7, the left spiral slideway 52 is arranged on the rotary end cap 8, and the rotary groove 5 is formed by the axial insertion connection between the rotary end cover 7 and the rotary end cap 8.

Therefore, the rotary cap can be used as a contact body of the spiral spring and the shell, the rotary end cover can be used for sealing the working cavity, the guide table can be connected with the rotary groove conveniently, the rotary groove can be machined conveniently, and machining and installation convenience is improved. In addition, according to the requirement of different operating modes, the structure that just can the rapid adjustment swivelling chute through changing rotatory end cover and rotatory cap forms to change the rotation condition that the rotatory control lever carries out the slip process along the swivelling chute, improve this booster pump's availability factor.

As described with reference to fig. 1, the piston 2 is provided with the first oil passage 24 and the second oil passage 25, and the housing 1 is provided with the third oil passage 15. Wherein, one end of the first oil path 24 is communicated with the closed cavity 6, and the other end is selectively communicated with the port P; one end of the second oil passage 25 is held in communication with the closed chamber 6, the other end is selectively communicated with the third oil passage 15, and the third oil passage 15 is held in communication with the T port.

When the big end of the piston 2 axially reciprocates in the control cavity to the terminal position, the first oil path 24 is communicated with the port P, the second oil path 25 is disconnected with the third oil path 15, at the moment, the closed cavity 6 is communicated with the port P, and high-pressure oil enters the closed cavity 6 and generates hydraulic acting force on the rotating control rod 3. When the large end of the piston 2 axially reciprocates in the control cavity, the first oil way 24 is disconnected from the port P, the second oil way 25 is communicated with the third oil way 15, at the moment, the closed cavity 6 is communicated with the port T, and the rotary control rod 3 loses the oil acting force in the closed cavity.

Preferably, two auxiliary oil holes 16 are provided in the housing 1, while two annular oil grooves 26 are provided on the outer surface of the large end of the piston 2. Wherein, two auxiliary oil holes 16 are distributed on two sides of the port P along the axial direction and are communicated with the port P. Two annular oil grooves 26 are respectively located at both ends of the large end of the piston 2, and at the same time, are kept in communication with the first oil passage 24. When the large end of the piston axially reciprocates in the control cavity to the terminal position, the auxiliary oil way is communicated with the annular oil groove, so that the communication between the port P and the first oil way is formed.

Preferably, an auxiliary oil groove 17 is further provided in the housing 1. The auxiliary oil grooves 17 are distributed in the axial direction in the area of contact between the small end of the piston 2 and the housing 1, and are held in communication with the third oil passage 15. When the large end of the piston performs axial reciprocating movement in the control cavity, the auxiliary oil groove is communicated with the third oil way, and then the closed cavity is communicated with the T port.

In this embodiment, the third oil path and the auxiliary oil hole are arranged on the shell, and the first oil path, the second oil path and the annular oil groove are arranged on the piston, so that the closed cavity is communicated with the P port or the T port respectively according to the position of the piston in the control cavity, the action of the rotating control rod is automatically controlled, the structural compactness of the whole booster water pump is greatly improved, and the volume of the whole booster water pump is reduced. In other embodiments, the oil pressure in the closed space can also be controlled by means of external pressure oil, as well as by means of a direct connection to the closed space by means of an external line.

As shown in fig. 1, a damping hole 151 is provided in the third oil passage 15. Can form the backpressure to the fluid that flows to the T mouth by the closed chamber through the damping hole, stabilize the speed that fluid flows out the closed chamber, improve the stability of rotary control pole action under the spring action power.

As shown in fig. 1, 5 to 7, and 13, in the booster water pump of the present embodiment, a positioning assembly 9 and a guide rod 10 are further provided. The guide rod 10 is fixed axially at one end of the control chamber of the housing 1 and is located in the right control chamber 112. The large end of the piston 2 is fitted over the guide rod 10 and can be reciprocated in the relative axial direction. The positioning assembly 9 is positioned between the piston 2 and the guide rod 10 and limits the piston and the guide rod in the circumferential direction.

The positioning assembly 9 is composed of a positioning hole 91, a positioning spring 92, a positioning ball 93 and a guide groove 94. Wherein, the guide groove 94 is arranged at the large end of the piston 2 along the axial direction, the positioning hole 91 is arranged at the outer surface of the guide rod 10 along the radial direction, and the positioning spring 92 and the positioning ball 93 are positioned in the positioning hole 91. When the piston 2 performs a circumferential rotation in the control chamber, the positioning ball 93 compresses the positioning spring 92 to be located in the positioning hole 91. When the piston 2 completes the turning and moves back and forth in the axial direction in the control chamber, one end of the positioning ball 93 is located in the positioning hole 91, and the other end thereof protrudes into the guide groove 94 under the action of the positioning spring 92.

At the moment, the piston can be guided and positioned in the axial reciprocating movement process by means of the positioning assembly and the guide rod, the stability of the piston in the axial reciprocating movement process is ensured, and the working stability and reliability of the whole booster water pump are improved.

Referring to fig. 1 to 10, when the booster water pump of this embodiment is used to output high-pressure water, the port P is connected to high-pressure oil, the port T is connected to an oil return tank, the water inlet 13 is connected to a water inlet pipe, the water outlet 14 is connected to a water outlet pipe, and the specific working process is as follows:

when the first oil groove 21 is communicated with the port P and the second oil groove 22 is communicated with the port T, the high-pressure oil at the port P enters the left control chamber 111 through the first oil groove 21, and forms an acting force directed to the right control chamber 112 on the piston 2. At this time, under the axial guiding action of the guide rod 10 on the piston 2 through the positioning assembly 9, the piston 2 moves towards the right control chamber 112, so that the water sucking operation of the working chamber 12 through the water inlet 14 is formed.

When the piston 2 moves to the end position of the right control chamber 112, the working chamber 12 completes the water sucking operation. At this time, the auxiliary oil hole 16 located at the right side of the port P is aligned with the annular oil groove 26 at the upper and right ends of the piston, the high-pressure oil of the port P flows to the closed chamber 6 sequentially through the auxiliary oil hole 16, the annular oil groove 26 and the first oil path 24, and the second oil path 25 is in a closed state. High-pressure fluid in the closed chamber 6 is greater than the elastic force of control 4 to the fluid effort that rotation control lever 3 formed, thereby drive rotation control lever 3 to carry out axial displacement to the working chamber direction, make direction platform 31 and the first end contact of first section left side spiral slideway 51, and carry out the relative slip along this section left side spiral slideway 51, form rotation control lever 3 along circumferencial direction's rotation, and then drive piston 2 and carry out the synchronous rotation of circumferencial direction, it is spacing along the circumferencial direction between 10 and the piston 2 to overcome locating component 9, when treating that direction platform 31 slides to the tail end of this section left side spiral slideway 51, first oil groove 21 turns to and communicates with the T mouth, second oil groove 22 turns to and communicates with the P mouth.

When the first oil groove 21 is communicated with the port T and the second oil groove 22 is communicated with the port P, the high-pressure oil at the port P enters the right control chamber 112 through the second oil groove 22, and forms an acting force directed to the left control chamber 111 on the piston 2. At this time, the piston 2 starts moving in the direction of the left control chamber 111, performs compression work on the water sucked into the working chamber 12, and performs high-pressure water output operation through the water outlet 14.

When the piston 2 starts to move in the direction toward the left control chamber 111, the auxiliary oil hole 16 is misaligned with the annular oil groove 26, so that the port P is disconnected from the closed chamber 6, the second oil passage 25 is communicated with the auxiliary oil groove 17, and the closed chamber 6 is communicated with the port T sequentially through the second oil passage 25, the auxiliary oil groove 17, and the third oil passage 15. At this time, the hydraulic acting force applied to the rotary control rod 3 is reduced, and under the action of the elastic acting force, the rotary control rod starts to axially move relative to the piston in the direction of the control cavity, so that the guide table 31 axially moves to be in contact with the head end of the first section of right-side spiral slideway 52, and starts to relatively slide along the section of right-side spiral slideway 52, so that the rotary control rod 3 continuously rotates in the same direction in the circumferential direction, and further drives the piston 2 to continuously rotate synchronously in the circumferential direction, when the guide table 31 slides to the tail end of the section of right-side spiral slideway 52, the positioning assembly 9 newly forms axial guide and circumferential limit between the piston 2 and the guide rod 10, the rotary control rod 3 stops acting, and the piston 2 completes all steering actions.

When the piston 2 moves to the end position of the left control chamber 111, the working chamber 12 completes the draining operation. At this time, the auxiliary oil hole 16 located at the left side of the port P is aligned with the annular oil groove 26 at the upper left end of the piston, and the high-pressure oil of the port P flows into the closed chamber 6 again through the auxiliary oil hole 16, the annular oil groove 26 and the first oil passage 24, while the second oil passage 25 is closed again. High-pressure oil in the closed cavity 6 is greater than the elastic force of control 4 to the fluid effort that the rotation control pole 3 formed, thereby drive rotation control pole 3 to carry out axial displacement to the working chamber direction, make direction platform 31 and the contact of the head end of second section left side spiral slideway 51, and carry out the relative slip along this section left side spiral slideway 51, form rotation control pole 3 along circumferencial direction's rotation, and then drive piston 2 and carry out the synchronous rotation of circumferencial direction, it is spacing along the circumferencial direction between 10 and the piston 2 to overcome locating component 9, when treating that direction platform 31 slides to the tail end of this section left side spiral slideway 51, first oil groove 21 turns to and communicates with P mouth again, second oil groove 22 turns to and communicates with T mouth again.

When the first oil groove 21 communicates with the port P again and the second oil groove 22 communicates with the port T again, the high-pressure oil at the port P enters the left control chamber 111 through the first oil groove 21, and forms an acting force directed to the right control chamber 112 again on the piston 2, and the piston 2 starts to move in the direction of the right control chamber.

When the piston 2 starts moving toward the right control chamber 112, the auxiliary oil hole 16 is misaligned with the annular oil groove 26, so that the port P is disconnected from the closed chamber 6 again, the second oil passage 25 is re-communicated with the auxiliary oil groove 17, and the closed chamber 6 is communicated with the port T sequentially through the second oil passage 25, the auxiliary oil groove 17, and the third oil passage 15. At this time, the hydraulic acting force applied to the rotary control rod 3 is increased, and under the action of the hydraulic acting force, the rotary control rod starts to axially move in the direction of the control cavity, so that the guide table 31 axially moves to be in contact with the head end of the second section of right-side spiral slideway 52, and starts to relatively slide along the section of right-side spiral slideway 52, so that the rotary control rod 3 continuously rotates in the same direction of the circumferential direction, and further drives the piston 2 to continuously rotate synchronously in the circumferential direction, when the guide table 31 slides to the tail end of the section of right-side spiral slideway 52, the positioning assembly 9 newly forms axial guidance and circumferential limitation between the piston 2 and the guide rod 10, the rotary control rod 3 stops acting, and the piston 2 finishes all steering actions again.

Through the circulation operation, the pressurizing water pump can continuously compress, apply work and output water. In the embodiment, in the axial projection, the two left spiral slideways and the two right spiral slideways are sequentially connected end to end along the circumferential direction in an alternating manner to form a complete circumference. Like this, in the whole process that the piston turned to, oil hydraulic pressure reduces and under elastic action force in the closed cavity, when making the direction platform switch over the slip between left side spiral slideway and right side spiral slideway, can make the direction platform directly switch over to the head end of right side spiral slideway and directly switch over to left side spiral slideway head end by the tail end of right side spiral slideway by left side spiral slideway tail end to make the rotary control pole carry out the smooth slip in the swivelling chute, realize the continuous stable rotation along same direction, and then guarantee the piston and turn to the quick smooth of operation at every turn and go on.

Claims

1. A booster water pump is characterized by comprising a shell and a piston;

a control cavity and a working cavity are arranged inside the shell, a port P, a port T, a water inlet and a water outlet are arranged on the shell, the port P and the port T are communicated with the control cavity, and the water inlet and the water outlet are communicated with the working cavity;

2. The booster water pump according to claim 1, wherein the outer surface of the large end of the piston is provided with a first oil groove and a second oil groove which are axially opened, and the first oil groove and the second oil groove are symmetrically distributed in the circumferential direction; the first oil groove axially communicates with the left control cavity, the second oil groove axially communicates with the right control cavity, the first oil groove is communicated with the P port, the second oil groove is communicated with the T port, and the first oil groove is communicated with the T port, and the second oil groove is communicated with the P port.

3. The booster pump of claim 2 further comprising a rotary control lever and control member, and a rotary slot at one end of the housing;

the two ends of the rotating control rod are respectively a steering end and a stress end; the steering end of the rotating control rod is positioned in the rotating groove and can slide relatively along the rotating groove to form rotation of the rotating control rod around the circumferential direction; the stress end of the rotary control rod is inserted into the small end of the piston along the axial direction to form sliding connection along the axial direction and limiting connection along the circumferential direction;

4. The booster pump of claim 3, wherein the control member is an elastic member and a closed cavity is provided between the force-bearing end of the rotary control rod and the small end of the piston;

5. The booster pump of claim 4, further comprising a rotary end cap and a rotary end cap; the rotary end cover and the rotary cap are sequentially detachably fixed at one end of the working cavity of the shell along the axial direction, the right spiral slideway is located on the rotary end cover, and the left spiral slideway is located on the rotary cap.

6. The booster water pump according to claim 4, wherein a left auxiliary spiral slideway is further provided between the two sections of the left spiral slideway, a right auxiliary spiral slideway is further provided between the two sections of the right spiral slideway, and the left spiral slideway, the left auxiliary spiral slideway, the right spiral slideway and the right auxiliary spiral slideway form a form in which upper and lower teeth are staggered with each other along an axis.

7. The booster pump of claim 4, wherein the piston is provided with a first oil passage and a second oil passage, and the housing is provided with a third oil passage; one end of the first oil way is communicated with the closed cavity, and the other end of the first oil way is selectively communicated with the port P; one end of the second oil way is communicated with the closed cavity, the other end of the second oil way is selectively communicated with the third oil way, and the third oil way is communicated with a T port; when the large end of the piston axially reciprocates in the control cavity to a terminal position, the first oil way is communicated with the port P, and the second oil way is disconnected with the third oil way; when the large end of the piston axially reciprocates in the control cavity, the first oil way is disconnected with the port P, and the second oil way is communicated with the third oil way.

8. The booster pump of claim 7, wherein the housing is provided with two auxiliary oil holes, and the outer surface of the large end of the piston is provided with two annular oil grooves; the two auxiliary oil holes are distributed on two sides of the port P along the axial direction and are communicated with the port P; the two annular oil grooves are respectively positioned at two ends of the large end of the piston and are simultaneously communicated with the first oil way; when the large end of the piston axially reciprocates in the control cavity to a terminal position, the auxiliary oil way is communicated with the annular oil groove to form communication between the P port and the first oil way.

9. The booster water pump of claim 7, wherein the housing is provided with an auxiliary oil sump; the auxiliary oil grooves are distributed in the contact area between the small end of the piston and the shell along the axial direction and are communicated with the third oil passage; and when the large end of the piston axially reciprocates in the control cavity, the auxiliary oil groove is communicated with the third oil path.

10. The booster pump of any one of claims 1 to 9, further comprising a positioning assembly and a guide rod; the guide rod is fixed on the shell along the axial direction, and the large end of the piston is sleeved on the guide rod; the positioning assembly is positioned between the piston and the guide rod; the positioning assembly consists of a positioning hole, a positioning spring, a positioning ball and a guide groove, wherein the guide groove and the positioning hole are respectively positioned at the large end of the piston and the outer surface of the guide rod, the guide groove is axially distributed, the positioning hole is radially formed, and the positioning spring and the positioning ball are positioned in the positioning hole; when the piston rotates in the circumferential direction in the control cavity, the positioning ball compresses the positioning spring to be positioned in the positioning hole; when the piston moves back and forth in the control cavity in the axial direction, one end of the positioning ball is located in the positioning hole, and the other end of the positioning ball is located in the guide groove.