CN111271238A - Submersible pump - Google Patents

Abstract

The invention provides a submersible pump, comprising: the pump body, left end cap, right end cap, piston, connecting rod, nut, feed liquor check valve and play liquid check valve, drive shaft, first spring. The submersible pump provided by the embodiment of the invention has the advantages of simple structure, high integration, small volume and simple driving mode, and has the advantages of small heat generation and no limitation of a power supply in comparison with the prior art.

Description

Submersible pump

Technical Field

The invention belongs to the technical field of submersible pumps, and particularly relates to a hydraulically-driven submersible pump.

Background

The submersible pump is used as a common mechanical device in a fluid conveying place, is widely applied to industries such as metallurgy, electric power, light spinning, petroleum, chemical engineering, chemical fertilizer, papermaking, environmental protection and the like, and mainly comprises pump types such as a well pump, a submersible sewage pump, a submersible mixed flow pump, a submersible axial flow pump and the like.

At present, a submersible pump used in industry comprises a pump body, wherein a water inlet and a water outlet are formed in the wall of the pump body, a motor is arranged in the pump body, the motor is provided with a motor shaft, one end of the motor shaft extends out of a motor shell, and an impeller is arranged at the extending end. When the submersible pump works, the motor generates heat, the shell and the pump body of the motor usually have heat dissipation performance, but under normal conditions, the heat generated by the motor in unit time is larger than the heat dissipated by the shell and the pump body of the motor in unit time, and the traditional submersible pump generally dissipates heat only by the heat dissipation performance of the pump body and the motor shell, so that the temperature in the motor rises faster when the traditional submersible pump is continuously used, the working time of the motor at high temperature is longer, and the service life of the motor is shortened. In addition, the existing submersible pump is directly driven by a motor and is greatly limited by power supply, so that the submersible pump cannot be used in an environment where power supply cannot be provided, and application and popularization are limited.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, an object of the present invention is to provide a hydraulically driven submersible pump, which has the advantages of simple structure, high integration, small volume, and simple driving manner, and has the advantages of less heat generation and no limitation of a power supply compared with the prior art.

The submersible pump according to the embodiment of the invention comprises:

the pump body is provided with a piston hole which is communicated from left to right, and the side wall of the pump body is provided with a first oil port and a second oil port which are respectively communicated with the piston hole;

the left end cover is arranged on the pump body to seal a left opening of the piston hole, a left end cover blind hole with a rightward opening and coaxial with the piston hole is formed in the left end cover, the aperture of the left end cover blind hole is smaller than that of the piston hole, a left through flow groove and a right through flow groove which are spaced left and right are formed in the inner peripheral wall of the left end cover blind hole, and a first flow passage for communicating the first oil port with the right through flow groove and a second flow passage for communicating the second oil port with the left through flow groove are formed in the pump body and the left end cover;

the right end cover is arranged on the pump body to seal a right opening of the piston hole;

the piston comprises a main body section which is matched in the piston hole in a left-right moving mode and a reducing section which is matched in the blind hole of the left end cover in a left-right moving mode, wherein the peripheral wall of the main body section is provided with a first flow through groove and a second flow through groove which extend in the left-right direction, the left end of the first flow through groove is communicated with the left end surface of the main body section, the right end of the first flow through groove is sealed, the left end of the second flow through groove is sealed, the right end of the second flow through groove is communicated with the right end surface of the main body section, the piston is provided with a left-right through piston through hole, the piston through hole comprises a first hole section, a second hole section, a third hole section, a fourth hole section and a fifth hole section, the pore diameter of the piston is sequentially increased from left to right, the peripheral wall of the reducing section is communicated with the damping hole of the second hole section, and the inner peripheral wall of the third hole section is provided with two spiral grooves which, the right end of each spiral groove extends to the inner peripheral wall of the fourth hole section;

the connecting rod is inserted in the piston through hole and comprises a first rod section, a second rod section, a third rod section and a fourth rod section, the outer diameter of the first rod section is matched with the inner diameter of the first hole section, the left end of the first rod section extends out of the left end face of the piston leftwards, the right end face of the first rod section is flush with the left end face of the fourth hole section, the second rod section and the third rod section are both arranged in the fourth hole section, the outer diameter of the third rod section is matched with the inner diameter of the fourth hole section, the fourth rod section is matched in the fifth hole section, the right end face of the fourth rod section is flush with the right end face of the piston, a connecting rod blind hole with a right opening and coaxial with the piston hole is arranged on the connecting rod, and a first key groove extending leftwards and rightwards is arranged on the inner peripheral wall of the connecting rod blind hole, the right end cover is provided with a positioning column which extends leftwards and is matched with the blind hole of the connecting rod, and a first flat key matched with the first key groove is arranged on the positioning column;

the nut is arranged in the left end cover blind hole and connected with the left end of the first rod section, a cavity is defined between the left end surface of the nut and the bottom surface of the left end cover blind hole in the left end cover blind hole, and the left end cover is provided with an inlet and an outlet which are communicated with the cavity;

the liquid inlet one-way valve is arranged on the left end cover and used for normally sealing the inlet, and the liquid outlet one-way valve is arranged on the left end cover and used for normally sealing the outlet;

the driving shaft is sleeved on the first rod section in the piston through hole and comprises a driving shaft reducing section matched with the second hole section and a driving shaft main body section matched with the third hole section, two protrusions matched with the two spiral grooves in a one-to-one correspondence mode are arranged on the outer peripheral wall of the driving shaft main body section, a second key groove extending leftwards and rightwards is formed in the inner wall of the through hole of the driving shaft, a second flat key matched with the second key groove is arranged on the outer peripheral wall of the first rod section, and a control cavity is defined among the left end face of the second hole section, the outer peripheral face of the first rod section and the left end face of the driving shaft in the second hole section;

the first spring is sleeved on the connecting rod, the right end of the first spring abuts against the left end face of the third rod section, and the right end of the first spring abuts against the right end face of the driving shaft 5 so as to normally push the driving shaft to the left;

the piston moves left and right to drive the connecting rod to move left and right relative to the positioning column, the driving shaft can reciprocate left and right relative to the connecting rod, and when the driving shaft reciprocates left and right relative to the connecting rod, the driving shaft drives the piston to rotate relative to the connecting rod so as to be sequentially switched among a first position, a second position, a third position and a fourth position;

when the piston is located at the first position, the main body section is located in the middle of the piston hole, the first spring pushes the driving shaft leftwards to enable the left end face of the driving shaft main body section to abut against the right end face of the second hole section, the first oil port is communicated with the first through-flow groove, the second oil port is communicated with the second through-flow groove, the outer peripheral wall of the reducing section closes the right through-flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through-flow groove and the second flow passage;

when the piston is located at the second position, the piston translates from left to right until the right end face of the main body section abuts against the left end face of the right end cover, the damping hole is communicated with the right through-flow groove 71 so that the first oil port is communicated with the controller through the first flow passage, the right through-flow groove and the damping hole, the driving shaft translates rightward by overcoming the elastic force of the first spring so that the right end of the driving shaft main body section abuts against the left end face of the second rod section so that the driving shaft drives the piston to overturn along a first direction, at the moment, the first oil port is communicated with the second through-flow groove, the second oil port is communicated with the first through-flow groove, and the left through-flow groove is communicated with the second oil port through the second flow passage;

when the piston is located at the third position, the piston translates from right to left to enable the main body section to be located in the middle of the piston hole, the right end of the driving shaft main body section abuts against the left end face of the second rod section, the first oil port is communicated with the second through flow groove, the second oil port is communicated with the first through flow groove, the outer peripheral wall of the reducing section seals the right through flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through flow groove and the second flow passage;

when the piston is located at the fourth position, the piston translates from right to left to enable the left end face of the main body section to abut against the left end face, the first spring pushes the driving shaft leftwards to enable the left end face of the driving shaft main body section to abut against the right end face of the second hole section, the first oil port is communicated with the first through flow groove, the second oil port is communicated with the second through flow groove, the outer peripheral wall of the reducing section seals the right through flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through flow groove and the second flow passage.

Advantageously, the submersible pump further comprises a positioning assembly comprising:

a slider provided on the piston so as to be movable left and right;

the lower end of the positioning block downwards penetrates through the sliding block and is arranged on the piston in a vertically movable mode, and a corresponding slope is formed between the positioning block and the sliding block;

a second spring, an upper end of the second spring abutting against the piston and a lower end of the second spring abutting against an upper end of the positioning block, the second spring normally urging the positioning block downward such that the lower end of the positioning block is normally directed toward the third bore section;

when the piston is located at the first position and the fourth position, the left end of the sliding block is flush with the left end face of the main body section, the lower end of the positioning block abuts against the outer peripheral face of the driving shaft main body section, when the piston is located at the second position and the third position, the left end of the sliding block extends leftwards out of the left end face of the main body section, and the lower end of the positioning block abuts against the outer peripheral face of the driving shaft reducing section and abuts against the left end face of the driving shaft main body section.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a submersible pump according to one embodiment of the present invention;

FIG. 2 is a schematic illustration of a submersible pump according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of a submersible pump according to yet another embodiment of the present invention;

FIG. 4 is a schematic illustration of a submersible pump according to yet another embodiment of the present invention;

FIG. 5 is a schematic view of a piston of a submersible pump according to one embodiment of the present invention;

FIG. 6 is another schematic view of a piston of a submersible pump according to one embodiment of the present invention;

FIG. 7 is a schematic view of a drive shaft according to one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A submersible pump according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 7, a submersible pump according to an embodiment of the present invention includes: the pump body 1, left end lid 7, right-hand member lid 4, piston 2, connecting rod 3, nut 11, inlet check valve 12 and play liquid check valve 13, drive shaft 5, first spring 6.

Specifically, the pump body 1 has a left-right through piston hole, and the side wall of the pump body has a first port P and a second port T that are respectively communicated with the piston hole.

The left end cap 7 is provided on the pump body 1 to close the left opening of the piston bore. The left end cover 7 is provided with a left end cover blind hole which is opened rightwards and is coaxial with the piston hole, the aperture of the left end cover blind hole is smaller than that of the piston hole, and the inner peripheral wall of the left end cover blind hole is provided with a left through flow groove 72 and a right through flow groove 71 which are spaced leftwards and rightwards. The pump body 1 and the left end cover 7 are provided with a first flow passage 101 for communicating the first port P and the right through-flow groove 71, and a second flow passage 102 for communicating the second port T and the left through-flow groove 72.

The right end cap 4 is provided on the pump body 1 to close the right opening of the piston bore.

The piston 2 comprises a main body section which can be fitted in the piston hole in a left-right mode and a reducing section which can be fitted in the blind hole of the left end cover in a left-right mode. The peripheral wall of the main body section is provided with a first through flow groove 22 and a second through flow groove 23 which extend along the left-right direction. The left end of the first through flow groove 22 is communicated with the left end face of the main body section, the right end of the first through flow groove 22 is closed, the left end of the second through flow groove 23 is closed, and the right end of the second through flow groove 23 is communicated with the right end face of the main body section. Piston through-hole about having on the piston 2 and lining up, piston through-hole includes that the aperture increases in proper order from left to right first hole section, second hole section, third hole section, fourth hole section and fifth hole section. The reducing section is provided with a damping hole 21 which is communicated with the outer peripheral wall of the reducing section and the second hole section, the inner peripheral wall of the third hole section is provided with two opposite spiral grooves 24, and the right end of each spiral groove 24 extends to the inner peripheral wall of the fourth hole section.

The connecting rod 3 is inserted in the piston through hole, the connecting rod 3 comprises a first rod section, a second rod section, a third rod section and a fourth rod section, the outer diameter of the first rod section is matched with the inner diameter of the first hole section, the left end of the first rod section extends out of the left end face of the piston leftwards, the right end face of the first rod section is flush with the left end face of the fourth hole section, the second rod section and the third rod section are both arranged in the fourth hole section, the outer diameter of the third rod section is matched with the inner diameter of the fourth hole section, the fourth rod section is matched in the fifth hole section, the right end face of the fourth rod section is flush with the right end face of the piston 2, a connecting rod blind hole with an opening rightwards and coaxial with the piston hole is arranged on the connecting rod 3, a first key groove 301 extending leftwards is arranged on the inner peripheral wall of the connecting rod, the right end cover 4 is provided with a positioning column 42 which extends leftwards and is matched with the blind hole of the connecting rod, and the positioning column 42 is provided with a first flat key 41 matched with the first key groove 301. Thus, the connecting rod 3 can only slide left and right and cannot rotate.

The nut 11 is arranged in the left end cover blind hole and connected with the left end of the first rod section, a cavity 7a is defined between the left end face of the nut 11 and the bottom surface of the left end cover blind hole in the left end cover blind hole, and the left end cover 1 is provided with an inlet V and an outlet C which are communicated with the cavity 7 a.

The liquid inlet one-way valve 12 is arranged on the left end cover 7 and used for normally sealing the inlet V, and the liquid outlet one-way valve 13 is arranged on the left end cover 7 and used for normally sealing the outlet C.

The driving shaft 5 is sleeved on the first rod section in the piston through hole, the driving shaft 5 comprises a driving shaft reducing section matched with the second hole section and a driving shaft main body section matched with the third hole section, two protrusions 51 matched with the two spiral grooves 24 in a one-to-one correspondence mode are arranged on the outer peripheral wall of the driving shaft main body section, a second key groove 52 extending left and right is formed in the inner wall of the through hole of the driving shaft 5, and a second flat key 55 matched with the second key groove 52 is arranged on the outer peripheral wall of the first rod section. Therefore, the drive shaft 5 can move only in the left-right direction in the axial direction and cannot rotate. A control chamber 5a is defined in the second bore section between the left end face of the second bore section, the outer circumferential surface of the first rod section and the left end face of the drive shaft. It will be appreciated that when the drive shaft 5 moves left and right, the piston 2 can rotate relative to the connecting rod 3 because the two protrusions 51 are correspondingly engaged in the two spiral grooves 24.

The first spring 6 is sleeved on the connecting rod 3, the right end of the first spring 6 abuts against the left end face of the third rod section, and the right end of the first spring 6 abuts against the right end face of the driving shaft 5 to normally push the driving shaft to the left.

The piston 2 moves left and right to drive the connecting rod 3 to move left and right relative to the positioning column 42, the driving shaft 5 can move left and right in a reciprocating mode relative to the connecting rod 3, and when the driving shaft 5 moves left and right in a reciprocating mode relative to the connecting rod 3, the driving shaft 5 can drive the piston 2 to rotate relative to the connecting rod 3 to be sequentially switched among the first position, the second position, the third position and the fourth position.

When the piston 2 is in the first position, as shown in fig. 1, the body section is located in the middle of the piston bore, and the first spring 6 pushes the drive shaft 5 to the left so that the left end face of the drive shaft body section abuts against the right end face of the second bore section. The first oil port P is communicated with the first through flow groove 22, the second oil port T is communicated with the second through flow groove 23, the outer peripheral wall of the reducing section seals the right through flow groove 71, and the control cavity 5a is communicated with the second oil port T through the damping hole 21, the left through flow groove 72 and the second flow passage 102.

As shown in fig. 2, when the piston 2 is at the second position, the piston 2 translates from left to right until the right end surface of the main body section abuts against the left end surface of the right end cover, the damping hole 21 is communicated with the right through-flow groove 71 so that the first oil port P is communicated with the controller 5a through the first flow passage 101, the right through-flow groove 71 and the damping hole 21, the driving shaft 5 translates rightward against the elastic force of the first spring 6 so that the right end of the driving shaft main body section abuts against the left end surface of the second rod section so that the driving shaft 5 drives the piston 2 to turn over along the first direction, at this time, the first oil port P is communicated with the second through-flow groove 23, the second oil port T is communicated with the first through-flow groove 22, and the left through-flow groove 72 is communicated with the second oil port T through the.

As shown in fig. 3, when the piston is in the third position, the piston 2 translates from right to left so that the main body section is located in the middle of the piston hole, the right end of the drive shaft main body section abuts against the left end surface of the second rod section, the first oil port P is communicated with the second through-flow groove 23, the second oil port T is communicated with the first through-flow groove 22, the outer peripheral wall of the reducing section closes the right through-flow groove 71, and the control chamber 5a is communicated with the second oil port T through the damping hole 21, the left through-flow groove 72 and the second flow passage 102.

As shown in fig. 4, when the piston 2 is at the fourth position, the piston 2 translates from right to left to make the left end surface of the main body segment abut against the left end surface, the first spring 6 pushes the driving shaft 5 leftwards to make the left end surface of the driving shaft main body segment abut against the right end surface of the second hole segment so that the driving shaft 5 drives the piston 2 to turn over along the second direction, the first oil port P is communicated with the first through flow groove 22, the second oil port T is communicated with the second through flow groove 23, the outer peripheral wall of the reducing segment closes the right through flow groove 71, and the control cavity 5a is communicated with the second oil port T through the damping hole 21, the left through flow groove 72 and the second flow passage 102.

In short, the first port P is communicated with the first through flow groove 22 and the second port T is communicated with the second through flow groove 23, or the first port P is communicated with the second through flow groove 23 and the second port T is communicated with the first through flow groove 22, so that the piston 2 can move left and right; first hydraulic fluid port P and control chamber 5a intercommunication or second hydraulic fluid port T and control chamber 5a intercommunication, can be that drive shaft 5 moves about and then makes piston 2 overturn to change the volume of cavity 7a, and then make import V feed liquor or make export C go out the liquid.

Advantageously, the submersible pump further comprises a positioning assembly comprising: a slide block 8, a positioning block 9 and a second spring 10.

Specifically, as shown in fig. 1, the slider 8 is provided on the piston 2 so as to be movable left and right.

The lower end of the positioning block 9 passes through the sliding block 8 downwards and is arranged on the piston 2 in a manner of moving up and down, and a corresponding slope is arranged between the positioning block 9 and the sliding block 8.

The upper end of the second spring 10 abuts against the piston 2 and the lower end of the second spring abuts against the upper end of the positioning block 9, and the second spring 10 normally pushes the positioning block downwards so that the lower end of the positioning block always points to the third hole section.

When the piston 2 is at the first position and the fourth position, the left end of the sliding block 8 is flush with the left end surface of the main body section, and the lower end of the positioning block 9 abuts against the outer peripheral surface of the driving shaft main body section. When the piston 2 is at the second position and the third position, the left end of the sliding block 8 extends to the left of the left end surface of the main body section, and the lower end of the positioning block 9 abuts against the outer peripheral surface of the reducing section of the driving shaft and the left end surface of the main body section of the driving shaft.

The working principle of the submersible pump according to an embodiment of the present invention is described as follows:

when the hydraulic pump is used, the first oil port P is connected with the outlet of the hydraulic pump, the second oil port T is connected with the oil tank, the inlet V is connected with the liquid inlet, and the outlet C is connected with the liquid outlet. The connecting rod 3 is internally provided with a first key groove 301 matched with the first flat key 41, so that the connecting rod 3 can only slide left and right and can not rotate, the driving shaft 5 is internally provided with a second key groove 52, and the connecting rod 3 is provided with a second flat key 55 matched with the second key groove 52 in a sliding manner, so that the driving shaft 5 can only move left and right along the axial direction and can not rotate. The slider 8, the positioning block 9 and the spring 10 jointly form a positioning assembly, and the positioning assembly plays a role in positioning the driving shaft 5 when the driving shaft 5 is positioned at the rightmost end position, wherein the lower end of the positioning block 9 extends into a step of the outer diameter of the driving shaft 5.

Assuming that the piston 2 is at the position shown in fig. 1, the control chamber 5a is connected with the second oil port T through the damping hole 21, the left through-flow groove 72 and the second flow passage 102, the driving shaft 5 is at the leftmost position under the action of the first spring 6, and the piston 2 rotates to the position shown in fig. 1 through the cooperation of the protrusion 51 on the driving shaft 5 and the spiral groove 24, at this time, the first oil port P is communicated with the left piston chamber through the first through-flow groove 22, the second oil port T is communicated with the right piston chamber through the second through-flow groove 23, the piston 2 moves to the right, the damping hole 21 is covered, and the chamber 7a sucks liquid through the liquid inlet check valve 12.

When the piston 2 moves to the position shown in fig. 2, that is, the damping hole 21 is communicated with the first oil port P through the right through-flow groove 71 and the first flow passage 101, oil of the first oil port P enters the control chamber 5a through the damping hole 21, pressure acts on the driving shaft 5 to push the driving shaft 5 to move rightward, and further, the piston 2 is rotated to the position shown in fig. 3 by the engagement of the projection 51 with the spiral groove 24, and at the same time, the drive shaft 5 is moved to the right end position, under the action of the second spring 10, the positioning block 9 slides downwards and drives the sliding block 8 to extend leftwards through the inclined plane, the lower end of the positioning block 9 extends into the step of the driving shaft 5, the driving shaft 5 is positioned, at the moment, the first oil port P is communicated with the right piston cavity through the second through flow groove 23, the second oil port T is communicated with the left piston cavity through the first through flow groove 22, the piston 2 starts to move leftwards, and the liquid in the cavity 7a is discharged to the outlet C through the liquid outlet one-way valve 13.

When the piston 2 moves to the left end, on one hand, the left end of the sliding block 8 collides with the left end cover 7, so that the sliding block 8 moves rightwards, and then the positioning block 9 moves upwards through the inclined plane, and the positioning of the driving shaft 5 is released; on the other hand, the damping hole 21 is communicated with the left through-flow groove 72 again, the pressure in the control cavity 5a is released to the second oil port T, the driving shaft 5 moves leftwards under the action of the first spring 6, and then the piston 2 rotates to the position shown in fig. 4 through the matching of the protrusion 51 and the spiral groove 24, at this time, the first oil port P is communicated with the left piston cavity through the first through-flow groove 22, the second oil port T is communicated with the right piston cavity through the second through-flow groove 23, the piston 2 moves rightwards, the liquid is absorbed in the cavity 7a, and circulation is formed so far, as long as the first oil port P has hydraulic oil to enter, the submersible pump according to the embodiment of the present invention can continuously absorb and discharge liquid.

The submersible pump according to the embodiment of the invention has the advantages that:

1. the device is highly integrated, compact in size and convenient to control;

2. the automatic reversing is realized by utilizing a hydraulic principle, circuit control is not needed, and a motor is not needed to be arranged like the prior art, so that the use environment is not limited by a power supply;

3. because the motor is not arranged and is driven only by hydraulic pressure, the heating is less than that of the prior art;

4. the liquid outlet can output high pressure by hydraulic drive and the piston drive plunger to move.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (2)

1. A submersible pump, comprising:

the pump body is provided with a piston hole which is communicated from left to right, and the side wall of the pump body is provided with a first oil port and a second oil port which are respectively communicated with the piston hole;

the left end cover is arranged on the pump body to seal a left opening of the piston hole, a left end cover blind hole with a rightward opening and coaxial with the piston hole is formed in the left end cover, the aperture of the left end cover blind hole is smaller than that of the piston hole, a left through flow groove and a right through flow groove which are spaced left and right are formed in the inner peripheral wall of the left end cover blind hole, and a first flow passage for communicating the first oil port with the right through flow groove and a second flow passage for communicating the second oil port with the left through flow groove are formed in the pump body and the left end cover;

the right end cover is arranged on the pump body to seal a right opening of the piston hole;

the piston comprises a main body section which is matched in the piston hole in a left-right moving mode and a reducing section which is matched in the blind hole of the left end cover in a left-right moving mode, wherein the peripheral wall of the main body section is provided with a first flow through groove and a second flow through groove which extend in the left-right direction, the left end of the first flow through groove is communicated with the left end surface of the main body section, the right end of the first flow through groove is sealed, the left end of the second flow through groove is sealed, the right end of the second flow through groove is communicated with the right end surface of the main body section, the piston is provided with a left-right through piston through hole, the piston through hole comprises a first hole section, a second hole section, a third hole section, a fourth hole section and a fifth hole section, the pore diameter of the piston is sequentially increased from left to right, the peripheral wall of the reducing section is communicated with the damping hole of the second hole section, and the inner peripheral wall of the third hole section is provided with two spiral grooves which, the right end of each spiral groove extends to the inner peripheral wall of the fourth hole section;

the connecting rod is inserted in the piston through hole and comprises a first rod section, a second rod section, a third rod section and a fourth rod section, the outer diameter of the first rod section is matched with the inner diameter of the first hole section, the left end of the first rod section extends out of the left end face of the piston leftwards, the right end face of the first rod section is flush with the left end face of the fourth hole section, the second rod section and the third rod section are both arranged in the fourth hole section, the outer diameter of the third rod section is matched with the inner diameter of the fourth hole section, the fourth rod section is matched in the fifth hole section, the right end face of the fourth rod section is flush with the right end face of the piston, a connecting rod blind hole with a right opening and coaxial with the piston hole is arranged on the connecting rod, and a first key groove extending leftwards and rightwards is arranged on the inner peripheral wall of the connecting rod blind hole, the right end cover is provided with a positioning column which extends leftwards and is matched with the blind hole of the connecting rod, and a first flat key matched with the first key groove is arranged on the positioning column;

the nut is arranged in the left end cover blind hole and connected with the left end of the first rod section, a cavity is defined between the left end surface of the nut and the bottom surface of the left end cover blind hole in the left end cover blind hole, and the left end cover is provided with an inlet and an outlet which are communicated with the cavity;

the liquid inlet one-way valve is arranged on the left end cover and used for normally sealing the inlet, and the liquid outlet one-way valve is arranged on the left end cover and used for normally sealing the outlet;

the driving shaft is sleeved on the first rod section in the piston through hole and comprises a driving shaft reducing section matched with the second hole section and a driving shaft main body section matched with the third hole section, two protrusions matched with the two spiral grooves in a one-to-one correspondence mode are arranged on the outer peripheral wall of the driving shaft main body section, a second key groove extending leftwards and rightwards is formed in the inner wall of the through hole of the driving shaft, a second flat key matched with the second key groove is arranged on the outer peripheral wall of the first rod section, and a control cavity is defined among the left end face of the second hole section, the outer peripheral face of the first rod section and the left end face of the driving shaft in the second hole section;

the first spring is sleeved on the connecting rod, the right end of the first spring abuts against the left end face of the third rod section, and the right end of the first spring abuts against the right end face of the driving shaft 5 so as to normally push the driving shaft to the left;

the piston moves left and right to drive the connecting rod to move left and right relative to the positioning column, the driving shaft can reciprocate left and right relative to the connecting rod, and when the driving shaft reciprocates left and right relative to the connecting rod, the driving shaft drives the piston to rotate relative to the connecting rod so as to be sequentially switched among a first position, a second position, a third position and a fourth position;

when the piston is located at the first position, the main body section is located in the middle of the piston hole, the first spring pushes the driving shaft leftwards to enable the left end face of the driving shaft main body section to abut against the right end face of the second hole section, the first oil port is communicated with the first through-flow groove, the second oil port is communicated with the second through-flow groove, the outer peripheral wall of the reducing section closes the right through-flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through-flow groove and the second flow passage;

when the piston is located at the second position, the piston translates from left to right until the right end face of the main body section abuts against the left end face of the right end cover, the damping hole is communicated with the right through-flow groove so that the first oil port is communicated with the controller through the first flow passage, the right through-flow groove and the damping hole, the driving shaft overcomes the elastic force of the first spring to translate right so that the right end of the driving shaft main body section abuts against the left end face of the second rod section so that the driving shaft drives the piston to overturn along a first direction, at the moment, the first oil port is communicated with the second through-flow groove, the second oil port is communicated with the first through-flow groove, and the left through-flow groove is communicated with the second oil port through the second flow passage;

when the piston is located at the third position, the piston translates from right to left to enable the main body section to be located in the middle of the piston hole, the right end of the driving shaft main body section abuts against the left end face of the second rod section, the first oil port is communicated with the second through flow groove, the second oil port is communicated with the first through flow groove, the outer peripheral wall of the reducing section seals the right through flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through flow groove and the second flow passage;

when the piston is located at the fourth position, the piston translates from right to left to enable the left end face of the main body section to abut against the left end face, the first spring pushes the driving shaft leftwards to enable the left end face of the driving shaft main body section to abut against the right end face of the second hole section, the first oil port is communicated with the first through flow groove, the second oil port is communicated with the second through flow groove, the outer peripheral wall of the reducing section seals the right through flow groove, and the control cavity is communicated with the second oil port through the damping hole, the left through flow groove and the second flow passage.

2. The submersible pump of claim 1, further comprising a positioning assembly, the positioning assembly comprising:

a slider provided on the piston so as to be movable left and right;

the lower end of the positioning block downwards penetrates through the sliding block and is arranged on the piston in a vertically movable mode, and a corresponding slope is formed between the positioning block and the sliding block;

a second spring, an upper end of the second spring abutting against the piston and a lower end of the second spring abutting against an upper end of the positioning block, the second spring normally urging the positioning block downward such that the lower end of the positioning block is normally directed toward the third bore section;

when the piston is located at the first position and the fourth position, the left end of the sliding block is flush with the left end face of the main body section, the lower end of the positioning block abuts against the outer peripheral face of the driving shaft main body section, when the piston is located at the second position and the third position, the left end of the sliding block extends leftwards out of the left end face of the main body section, and the lower end of the positioning block abuts against the outer peripheral face of the driving shaft reducing section and abuts against the left end face of the driving shaft main body section.

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