Water hydraulic plunger pump driven by permanent magnet

Abstract

The utility model discloses a permanent magnet driven water hydraulic plunger pump which comprises a shell and a water inlet and outlet end cover connected to the shell, a cylinder body is movably connected in the shell, an outer cover is movably connected outside the shell, an outer permanent magnet is arranged in the outer cover, an inner permanent magnet corresponding to the outer permanent magnet is arranged in the cylinder body, and the inner permanent magnet is arranged in the shell. The outer cover rotates to enable the outer permanent magnet to drive the inner permanent magnet to rotate synchronously, so that the cylinder body rotates. According to the water hydraulic plunger pump driven by the permanent magnet, dynamic sealing of a shaft is omitted, limitation of mechanical sealing is avoided, water inlet high pressure can be resisted, leakage caused by failure of the mechanical sealing is avoided, and the leakage risk is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger pump technical field especially relates to a permanent magnet drive's water hydraulic plunger pump. BACKGROUND

[0002] Water hydraulic plunger pump is now applied in the reverse osmosis system of water treatment industry, including waste leachate treatment, seawater desalination and industrial zero emission etc. field, water hydraulic plunger pump can pump water medium to higher working pressure with high efficiency, has the remarkable advantages such as power density (power ratio mass), working pressure is high, energy saving.

[0003] The water inlet pressure of water hydraulic plunger pump commonly used in reverse osmosis system is low, generally below 1MPa, but in some working conditions, the inlet pressure will be higher than 5MPa, the small simple structure high pressure mechanical seal pressure reaches not, and use is unstable. Although the combined high pressure mechanical seal can resist high pressure, its structure is complex, and the size and weight after pump installation increase obviously, which is not suitable for some scenes with limited volume and weight requirements.

[0004] In addition, in some projects of reverse osmosis industrial water treatment, the medium has corrosion, toxicity, pollution or easy volatilization and combustion, and the sealing requirement of the pump is relatively high. The mechanical seal is used for dynamic sealing of pump shaft rotation, and is a vulnerable part of pump equipment. Dynamic ring sealing surface wear, spring damage, rubber aging rupture, etc. may cause mechanical seal failure. If the inlet pressure is high, the reliability requirement of mechanical seal in this working condition will be higher. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems in the prior art of water hydraulic plunger pump, i.e. mechanical seal is not resistant to high pressure and mechanical seal is prone to failure. The utility model provides a water hydraulic plunger pump driven by permanent magnet, which cancels the dynamic sealing of the shaft, is not limited by mechanical seal, can resist high water inlet pressure, avoids leakage caused by mechanical seal failure, and greatly reduces the risk of leakage.

[0006] The utility model adopts the technical scheme that a water hydraulic plunger pump driven by permanent magnet comprises a shell, a water inlet and outlet end cover connected to the shell, a cylinder body movably connected in the shell, an outer cover movably connected outside the shell, an outer permanent magnet in the outer cover, an inner permanent magnet corresponding to the outer permanent magnet in the cylinder body, and the outer cover is rotated to drive the inner permanent magnet to rotate synchronously, so that the cylinder body is rotated.

[0007] Further, in order to realize that the outer cover can rotate relative to the shell, the two ends of the outer cover are connected with the front and rear ball bearings respectively, the front ball bearing is installed on the shell, and the rear ball bearing is installed on the rear end cover of the shell.

[0008] Further, in order to limit the front ball bearing, the front end of the outer cover is provided with a stepped limiting structure, the front end of the shell is provided with a mounting groove, the outer ring of the front ball bearing is connected with the mounting groove, and the inner ring of the front ball bearing is connected with the stepped limiting structure.

[0009] Further, in order to limit the rear ball bearing, the rear end of the outer cover is provided with a stepped hole, the shaft of the rear end cover passes through and extends out of the stepped hole, the outer ring of the rear ball bearing is connected with the stepped hole, and the inner ring of the rear ball bearing is connected with the shaft.

[0010] Further, in order to avoid axial movement of the front ball bearing, the rear ball bearing and the outer cover, the shaft is further threadedly connected with a compression nut for abutting against the inner ring of the rear ball bearing.

[0011] Further, in order to realize rotation of the cylinder relative to the shell, the rear end of the cylinder and the shell are connected with a front sliding bearing, and the front end of the cylinder and the water inlet and outlet end cover are connected with a rear sliding bearing.

[0012] Further, in order to transmit external power to the outer cover, the outer cover is connected with a magnetic driving shaft, and the magnetic driving shaft is driven by a motor so as to rotate the outer cover.

[0013] Further, in order to connect the shell and the water inlet and outlet end cover, the shell and the water inlet and outlet end cover are fixedly connected through bolts, and the shell and the water inlet and outlet end cover are provided with a sealing ring.

[0014] Further, in order to connect the shell and the rear end cover, the shell and the rear end cover are welded, or the shell and the rear end cover are fixedly connected through bolts and are provided with a sealing ring.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. The water hydraulic piston pump driven by permanent magnet of the utility model is provided with permanent magnets in the outer cover and the shell, directly drives the internal cylinder to move through the outer cover, does not need to use combined high-pressure mechanical seal under high-pressure water inlet condition, reduces the length size of the water hydraulic piston pump. Since the mechanical seal is not used, the utility model is not limited by the mechanical seal, avoids leakage caused by mechanical seal failure, and greatly reduces the leakage risk of the pump.

[0017] 2. The water hydraulic piston pump driven by permanent magnet of the utility model connects the outer cover on the shell through the front ball bearing and the rear ball bearing, limits the outer cover while ensuring that the outer cover can rotate, and guarantees the use effect of the piston pump. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described below in combination with the drawings and embodiments.

[0019] Figure 1 Structure diagram of the permanent magnet driven hydraulic plunger pump of the utility model is shown in the figure;

[0020] In the figure: 1, shell, 2, water inlet and outlet end cover, 3, rear end cover, 4, cover, 41, outer permanent magnet, 5, front ball bearing, 6, rear ball bearing, 7, magnetic drive shaft, 8, cylinder, 81, inner permanent magnet, 9, front sliding bearing, 10, compression nut, 11, plunger assembly, 12, rear sliding bearing. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so they only show the structure related to the utility model.

[0022] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and 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, so it cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0023] In the description of the utility model, it is explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] As Figure 1As shown, a permanent magnet driven water hydraulic plunger pump comprises a shell 1, an inlet and outlet water end cover 2 and a rear end cover 3 connected to the shell 1, the inlet and outlet water end cover 2 has a water inlet and a water outlet. The shell 1 is welded to the rear end cover 3, or the shell 1 and the rear end cover 3 are bolted and provided with a sealing ring. The shell 1 and the inlet and outlet water end cover 2 are bolted, and the shell 1 and the inlet and outlet water end cover 2 are provided with a sealing ring. The plunger pump has only two static seals, without the dynamic seal requirement of the shaft of the conventional water hydraulic plunger pump, without mechanical seal, and can better prevent leakage. The flow distribution disc, thrust disc, return disc, spring, swash plate and other parts in the plunger pump are prior art, so they are not shown in detail in the figure, and will not be described here. Other conventional plunger pumps can also be used to replace the flow distribution disc, thrust disc, return disc, spring, swash plate and other parts of the present application.

[0025] The outer cover 4 is movably connected to the shell 1, and the outer cover 4 has an outer permanent magnet 41. The two ends of the outer cover 4 are connected with the front ball bearing 5 and the rear ball bearing 6 respectively, the front ball bearing 5 is installed on the shell 1, and the rear ball bearing 6 is installed on the rear end cover 3. The outer cover 4 is connected with a magnetic drive shaft 7, the magnetic drive shaft 7 is driven by a motor to rotate the outer cover 4. When the external motor operates, power is transmitted to the outer cover 4 through the magnetic drive shaft 7, the outer cover 4 rotates under the support of the front ball bearing 5 and the rear ball bearing 6, and the outer permanent magnet 41 in the outer cover 4 also rotates synchronously.

[0026] The cylinder body 8 is movably connected in the shell 1, and the cylinder body 8 is connected with a plunger assembly 11. The cylinder body 8 has an inner permanent magnet 81 corresponding to the outer permanent magnet 41, the rotation of the outer cover 4 drives the inner permanent magnet 81 to rotate synchronously, so as to rotate the cylinder body 8. The rear end of the cylinder body 8 is movably connected in the shell 1 through the rear sliding bearing 12, and the front end of the cylinder body 8 is movably connected in the inlet and outlet water end cover 2 through the front sliding bearing 9. Because there is magnetic force between the inner permanent magnet 81 and the outer permanent magnet 41, when the outer cover 4 rotates, the cylinder body 8 also rotates synchronously, and under the support of the front sliding bearing 9 and the rear sliding bearing 12, the cylinder body 8 rotates in the shell 1. While rotating, the cylinder body 8 drives the plunger assembly to rotate reciprocatingly around the axis, absorbs low pressure water through the water inlet, and discharges high pressure water through the water outlet.

[0027] The front end of the outer cover 4 is provided with a stepped limiting structure, the front end of the shell 1 has a mounting groove, the outer ring of the front ball bearing 5 is connected with the mounting groove, and the inner ring of the front ball bearing 5 is connected with the stepped limiting structure. The rear end of the outer cover 4 has a stepped hole, the shaft of the rear end cover 3 passes through and extends out of the stepped hole, the outer ring of the rear ball bearing 6 is connected with the stepped hole, and the inner ring of the rear ball bearing 6 is connected with the shaft of the rear end cover 3. The shaft of the rear end cover 3 is threadedly connected with a compression nut 10 for abutting against the inner ring of the rear ball bearing 6. The rear ball bearing 6 is locked and limited by the compression nut 10. In the case that the position of the rear ball bearing 6 is fixed, the front ball bearing 5 and the outer cover 4 cannot be axially displaced, so that the front ball bearing 5, the rear ball bearing 6 and the outer cover cannot axially move.

[0028] In conclusion, the water hydraulic plunger pump driven by the permanent magnet cancels the dynamic seal of the shaft, is not limited by the mechanical seal, can resist high-pressure water, avoids leakage caused by the failure of the mechanical seal, and greatly reduces the leakage risk.

[0029] According to the ideal embodiments of the utility model, the related personnel can make various changes and modifications without deviating from the technical thought of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined by the scope of claims.

Claims

1. A permanent magnet driven hydrostatic piston pump comprising a housing (1) and an inlet and outlet water end cover (2) connected to the housing (1), characterized in that, The shell (1) is connected with a cylinder body (8) through a sliding bearing, the shell (1) is connected with an outer cover (4) through a ball bearing, the outer cover (4) has an outer permanent magnet (41) therein, the cylinder body (8) has an inner permanent magnet (81) corresponding to the outer permanent magnet (41) therein, the outer cover (4) is rotated to drive the outer permanent magnet (41) to rotate synchronously with the inner permanent magnet (81), so as to rotate the cylinder body (8).

2. A permanent magnet driven hydro- hydraulic ram pump according to claim 1, characterised in that, The outer cover (4) is connected with a front ball bearing (5) and a rear ball bearing (6) at two ends respectively, the front ball bearing (5) is installed on the shell (1), and the rear ball bearing (6) is installed on a rear end cover (3) connected with the shell (1).

3. A permanent magnet driven hydro- hydraulic ram pump according to claim 2, characterised in that, The front end of the outer cover (4) is provided with a stepped limiting structure, the front end of the shell (1) has a mounting groove, the outer ring of the front ball bearing (5) is connected with the mounting groove, and the inner ring of the front ball bearing (5) is connected with the stepped limiting structure.

4. The permanent magnet driven hydro- hydraulic piston pump of claim 2, wherein, The rear end of the outer cover (4) has a stepped hole, the shaft of the rear end cover (3) passes through and extends out of the stepped hole, the outer ring of the rear ball bearing (6) is connected with the stepped hole, and the inner ring of the rear ball bearing (6) is connected with the shaft.

5. The permanent magnet driven hydro- hydraulic piston pump of claim 4, wherein, The shaft is also threadedly connected with a compression nut (10) for abutting against the inner ring of the rear ball bearing (6).

6. The permanent magnet driven hydro- hydraulic piston pump of claim 1, wherein, The rear end of the cylinder body (8) and the shell (1) are connected with a rear sliding bearing (12), and the front end of the cylinder body (8) and the water inlet and outlet end cover (2) are connected with a front sliding bearing (9).

7. The permanent magnet driven hydro- hydraulic piston pump of claim 1, wherein, The outer cover (4) is connected with a magnetic driving shaft (7), the magnetic driving shaft (7) is driven by a motor to rotate the outer cover (4).

Images