Impeller pressurizing mechanism for plunger pump

Abstract

The utility model relates to the technical field of plunger pumps, in particular to an impeller pressurizing mechanism for a plunger pump, which comprises a left valve body and a right valve body which are hermetically assembled into a whole, an oil suction port and an oil discharge port which are matched with the oil distribution disc are formed in the outer end of the left valve body; a worm-shaped pressurizing cavity and an oil duct are arranged in the right valve body, and the outlet end of the worm-shaped pressurizing cavity is communicated with the oil suction port through the oil duct; a limiting boss A is arranged in the center of the worm-shaped pressurizing cavity, and an oil inlet cavity communicated with the worm-shaped pressurizing cavity is formed in the limiting boss A; a limiting boss B is arranged at the inner end of the left valve body, and an impeller driven by a main shaft is arranged in the worm-shaped pressurizing cavity. The impeller comprises a circular back plate; a plurality of backward bent blades are uniformly distributed at one end of the back plate, and a plurality of V-shaped grooves with outward openings are uniformly distributed at the other end of the back plate; the end surface of the backward bent blade is in plane sliding fit with the end surface of the limiting boss A; and the back plate is positioned between the limiting boss A and the limiting boss B. Therefore, the supercharging effect of the impeller can be improved, and meanwhile the overall installation convenience and stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger pump technical field, especially a kind of impeller supercharging mechanism for plunger pump. BACKGROUND

[0002] In prior art, the traditional swash plate type axial plunger pump makes the volume of plunger cavity repeatedly change by the repeated movement of plunger, so as to suck and discharge oil. Usually, the oil suction cavity of plunger pump can form a partial vacuum, and the oil in the oil tank can flow into the oil suction cavity under the action of atmospheric pressure, thereby realizing self-suction. However, as the speed of main shaft increases, the plunger pump will have the phenomenon of insufficient oil suction, which is called suction emptying. In order to solve the problem of suction emptying of swash plate type axial plunger pump and ensure stable operation of swash plate type axial plunger pump at high speed, a centrifugal impeller is usually arranged in front of the inlet of high-pressure plunger pump to increase the inlet pressure of plunger pump, thereby solving the problem of inlet suction emptying.

[0003] The conventional plunger pump structure mainly includes a housing, a swash plate, a main shaft, a rotor, a plunger, an oil distribution plate, a centrifugal impeller and a rear cover. The centrifugal impeller is driven by the main shaft to drive the oil at the inlet to do centrifugal motion, thereby increasing the oil pressure at the inlet and promoting the flow of pressurized oil into the oil distribution plate and then into the inner cavity of the rotor. At the same time, the main shaft drives the plunger and the rotor to rotate, and under the action of the swash plate, the plunger does reciprocating motion in the inner cavity of the rotor, thereby realizing oil suction and discharge. However, since the blades of the centrifugal impeller are mostly twisted blades, the design and processing of the impeller structure are difficult. Although the centrifugal impeller has the characteristics of high flow and low lift, the supercharging effect of the centrifugal impeller is relatively poor and the centrifugal impeller is inconvenient to replace.

[0004] Therefore, it is urgent to redesign an impeller supercharging mechanism which is convenient to disassemble and has improved supercharging effect. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects and deficiencies in the prior art, and provides an impeller supercharging mechanism for plunger pump, which can improve the supercharging effect and is convenient to install and disassemble as a separate whole.

[0006] In order to achieve the above object, the utility model provides a kind of impeller supercharging mechanism for plunger pump, including left valve body and right valve body being sealed and assembled as a whole;The outer end of the left valve body is equipped with suction port and oil outlet matched with oil distribution disc;The right valve body is equipped with volute supercharging chamber and oil channel, the outlet end of the volute supercharging chamber is connected with the suction port by the oil channel;The center of the volute supercharging chamber is equipped with limit boss A, the limit boss A is equipped with oil inlet chamber communicated with the volute supercharging chamber;The inner end of the left valve body is equipped with limit boss B;The volute supercharging chamber is equipped with impeller driven by main shaft;The back plate of the impeller includes circular;The back plate is equipped with a plurality of rear bent blades at one end, and a plurality of V-shaped grooves with outward opening are arranged at the other end;The end surface of the rear bent blade is in plane sliding fit with the end surface of the limit boss A;The back plate is located between the limit boss A and limit boss B.

[0007] Further, a connecting boss coaxial with the back plate is provided, the connecting boss is away from the rear bent blade;The connecting boss is fastened on the connecting sleeve in spline mode, and the connecting sleeve is fastened on the main shaft in spline mode.

[0008] Further, the outer end of the left valve body is further provided with a needle bearing matched with the main shaft.

[0009] Further, the outer end of the left valve body is further provided with a needle bearing matched with the main shaft.

[0010] Further, O-shaped sealing ring B is provided between the suction port and the oil channel, and the O-shaped sealing ring B is embedded in the inner end of the right valve body.

[0011] Further, the outer end of the right valve body is provided with the same suction port and oil outlet.

[0012] Further, a positioning pin is embedded between the left valve body and the right valve body.

[0013] Further, the top of the left valve body and the right valve body is provided with a lifting ring.

[0014] Further, the outer diameter of the limit boss A is the same as the outer diameter of the back plate.

[0015] Compared with the prior art, the utility model has the beneficial effects that: the rear bent blade of the impeller rotates in the volute supercharging chamber, which can improve the output pressure and flow of the plunger pump, and improve the working efficiency and reliability of the plunger pump. By placing the impeller between the limit boss A and the limit boss B, the impeller can be effectively protected, and the V-shaped groove on the impeller can run smoothly. The overall structure is simple, easy to install and low in maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model.

[0017] Figure 2 It is Figure 1 It is a schematic view of vertical section along the axis.

[0018] Figure 3 It is Figure 2 It is a schematic view of section position of the middle impeller and the volute supercharging cavity.

[0019] Figure 4 It is Figure 1 It is a schematic view of horizontal section along the axis.

[0020] Figure 5 It is Figure 2 It is a structural schematic view of the middle impeller.

[0021] Figure 6 It is Figure 5 It is the front view.

[0022] Figure 7 It is a supercharging effect simulation view of the middle impeller in the volute supercharging cavity in the utility model.

[0023] 1, left valve body; 2, right valve body; 3, impeller; 4, connecting sleeve; 5, needle bearing; 11, oil suction port; 12, oil discharge port; 13, limiting boss B; 14, positioning pin; 15, O-shaped sealing ring A; 16, lifting ring; 21, volute supercharging cavity; 22, limiting boss A; 23, oil inlet cavity; 24, oil channel; 25, O-shaped sealing ring B; 31, back plate; 32, connecting boss; 33, rear bent blade; 34, V-shaped groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. Embodiment

[0026] Please refer to Figures 1 to 6 The utility model provides a kind of impeller supercharging mechanism for plunger pump, including left valve body 1 and right valve body 2 being sealed and assembled as a whole;The outer end of left valve body 1 is equipped with suction port 11 and discharge port 12 matched with oil distribution plate;Right valve body 2 is equipped with volute supercharging chamber 21 and oil passage 24, and the outlet end of volute supercharging chamber 21 is connected with suction port 11 by oil passage 24;The center of volute supercharging chamber 21 is equipped with limiting boss A22, and limiting boss A22 is equipped with oil inlet chamber 23 communicated with volute supercharging chamber 21;The inner end of left valve body 1 is equipped with limiting boss B13;Volute supercharging chamber 21 is equipped with impeller 3 driven by main shaft;Impeller 3 includes circular back plate 31;Back plate 31 is equipped with a plurality of back bent blades 33 at one end, and is equipped with a plurality of V-shaped grooves 34 with outward opening at the other end;The end surface of back bent blade 33 is in plane sliding fit with the end surface of limiting boss A22;Back plate 31 is located between limiting boss A22 and limiting boss B13.

[0027] By placing impeller 3 between left valve body 1 and right valve body 2, it is convenient to connect with the main shaft of swash plate type plunger pump, and at the same time, as an independent individual, it can be conveniently and quickly installed at the oil distribution plate end of swash plate type plunger pump.Oil flows from oil inlet chamber 23 into volute supercharging chamber 21 through the end surface of limiting boss A22, and under the action of back bent blade 33 of impeller 3, the oil is supercharged to oil passage 24 and flows to suction port 11;And V-shaped groove 34 is arranged, so that the protruding part acts as a reinforcing rib to stabilize the structure.

[0028] The outer diameter of limiting boss A22 here is preferably the same as the outer diameter of back plate 31, further ensuring the stable movement of back bent blade 33.

[0029] Specifically, a connecting boss 32 is coaxially arranged on the above-mentioned back plate 31, and the connecting boss 32 is away from the back bent blade 33;The connecting boss 32 is fastened on the connecting sleeve 4 in the form of spline, and the connecting sleeve 4 is fastened on the main shaft in the form of spline, so as to adapt to the rotating speed of the main shaft.

[0030] The main shaft here can be rotatably connected with left valve body 1 through needle bearing 5, and the needle bearing 5 is arranged at the outer end of left valve body 1.

[0031] As an embodiment of this utility model, the limiting boss B13 is provided with an O-ring seal A15 embedded in the inner end of the left valve body 1, and the O-ring seal A15 is located between the left valve body 1 and the right valve body 2; Secondly, an O-ring seal B25 can be provided between the oil suction port 11 and the oil passage 24, and the O-ring seal B25 is embedded in the inner end of the right valve body 2; to ensure the sealing performance between the left valve body 1 and the right valve body 2.

[0032] In one embodiment of this utility model, the outer end of the right valve body 2 is provided with the same oil suction port 11 and oil discharge port 12. In use, two swashplate plunger pumps can be installed to improve efficiency.

[0033] Furthermore, during installation, a positioning pin 14 can be embedded between the left valve body 1 and the right valve body 2 for positioning. Both the left valve body 1 and the right valve body 2 are equipped with lifting rings 16 at their tops for overall hoisting.

[0034] In summary, the impeller 3 used in this utility model has a simple structure, small size, and light weight. For example... Figure 7 As shown, when the impeller 3 rotates, the hydraulic oil can flow along the volute booster chamber 21 in the direction of impeller 3 rotation. The hydraulic oil flowing into the space between the backward-curved blades 33 can generate centrifugal force under the push of the backward-curved blades 33. This causes the circumferential speed of the hydraulic oil in the backward-curved blades 33 to be different from that in the volute booster chamber 21. A longitudinal vortex with a direction perpendicular to the axial plane is generated between the two. Under the action of the longitudinal vortex, the hydraulic oil will exchange energy between the impeller 3 and the volute booster chamber 21 multiple times during the process from intake to discharge. Each energy exchange will increase the energy of the hydraulic oil in the volute booster chamber 21, thereby improving the boosting effect.

[0035] This utility model can be summarized in other specific forms that do not depart from the spirit or main features of this utility model. Therefore, in all respects, the above embodiments of this utility model should only be considered as descriptions of this utility model and not as limitations thereof. The claims specify the scope of this utility model, while the above description does not specify the scope of this utility model. Therefore, any changes within the meaning and scope equivalent to the claims of this utility model should be considered as included within the scope of the claims of this utility model.

Claims

1. An impeller booster mechanism for a plunger pump, characterized in that, The system includes a left valve body (1) and a right valve body (2) that are sealed and assembled as a single unit. The outer end of the left valve body (1) is provided with an oil suction port (11) and an oil discharge port (12) that match the oil distribution plate. The right valve body (2) is provided with a spiral booster chamber (21) and an oil passage (24). The outlet end of the spiral booster chamber (21) is connected to the oil suction port (11) through the oil passage (24). The center of the spiral booster chamber (21) is provided with a limiting boss A (22). The limiting boss A (22) is provided with an oil inlet chamber (23) that communicates with the spiral booster chamber (21). The left valve body (1) has a limiting boss B (13) at its inner end; the spiral booster chamber (21) has a main shaft driven impeller (3); the impeller (3) includes a circular back plate (31); one end of the back plate (31) is evenly distributed with several backward-curved blades (33), and the other end is evenly distributed with several outward-facing V-shaped grooves (34); the end face of the backward-curved blades (33) slides in cooperation with the end face of the limiting boss A (22); the back plate (31) is located between the limiting boss A (22) and the limiting boss B (13).

2. The impeller booster mechanism for a plunger pump according to claim 1, characterized in that, The back plate (31) is coaxially provided with a connecting boss (32), which is away from the backward curved blade (33); the connecting boss (32) is fitted and fastened to the connecting sleeve (4) in a spline manner, and the connecting sleeve (4) is fitted and fastened to the main shaft in a spline manner.

3. The impeller booster mechanism for a plunger pump according to claim 2, characterized in that, The outer end of the left valve body (1) is also provided with a needle roller bearing (5) that matches the main shaft.

4. The impeller booster mechanism for a plunger pump according to claim 3, characterized in that, The limiting boss B (13) is provided with an O-ring A (15) embedded in the inner end of the left valve body (1), and the O-ring A (15) is located between the left valve body (1) and the right valve body (2).

5. The impeller booster mechanism for a plunger pump according to claim 4, characterized in that, An O-ring seal B (25) is provided between the oil suction port (11) and the oil passage (24), and the O-ring seal B (25) is embedded in the inner end of the right valve body (2).

6. The impeller booster mechanism for a plunger pump according to claim 5, characterized in that, The right valve body (2) has the same oil suction port (11) and oil discharge port (12) at its outer end.

7. The impeller booster mechanism for a plunger pump according to claim 1, characterized in that, A positioning pin (14) is embedded between the left valve body (1) and the right valve body (2).

8. The impeller booster mechanism for a plunger pump according to claim 1, characterized in that, Both the left valve body (1) and the right valve body (2) are provided with lifting rings (16) at their top.

9. The impeller booster mechanism for a plunger pump according to claim 1, characterized in that, The outer diameter of the limiting boss A (22) is the same as the outer diameter of the back plate (31).

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