Magnetic drive pump head structure

Abstract

The utility model discloses a magnetic drive pump head structure which comprises a pump shell, a pump cover installed on the pump shell, a pump cavity formed between the pump shell and the pump cover, an impeller arranged in the pump cavity, a main shaft connected with the impeller and extending to the outside, and a nut in threaded connection with the main shaft and used for fastening the impeller. The nut is arranged into at least two nut blocks in a split mode in the axial direction of the nut, the nut blocks are matched with each other to form a matched state and a decomposed state of a screw hole, and the nut blocks are sleeved with fixing pieces used for fixing the nut blocks to be in the matched state. The utility model has the following advantages and effects: the impeller can be conveniently replaced, so that the later maintenance difficulty and the later maintenance cost of the product are reduced.

Description

Technical Field

[0001] This utility model relates to a magnetic pump, and more particularly to a magnetic pump head structure. Background Technology

[0002] A magnetic drive pump is a new type of centrifugal pump that applies the working principle of permanent magnet coupling to the design of centrifugal pumps, giving it features such as full sealing, no leakage, and corrosion resistance. A magnetic drive pump mainly consists of a pump head, a magnetic drive unit, a motor, and a connecting base plate.

[0003] Chinese patent CN204476778U discloses a direct-drive chemical pump structure, including a mounting base plate, a motor, a coupling, a connecting shaft, an intermediate support, an impeller, and a pump casing. The pump casing and the motor are mounted on the mounting base plate and are fixedly connected by the intermediate support. The motor is fixedly connected to the connecting shaft by a coupling installed in the intermediate support. An impeller is fixedly mounted on the connecting shaft inside the pump casing by an impeller nut. A mechanical seal is provided on the side of the pump casing near the motor, installed between the impeller and the intermediate support, and positioned by the step of the intermediate support.

[0004] When the fluid medium contains foreign objects with high hardness, these objects can easily damage the impeller upon contact with it during high-speed rotation. Given the uncontrollable nature of this factor, impeller replacement is a frequent maintenance operation for pumps. In the aforementioned patent, the shaft and impeller are connected via an impeller nut. Since the impeller nut is located inside the pump casing and is in direct contact with the fluid medium, corrosive fluids can cause jamming or even seizing at the threaded connection of the impeller nut. This significantly increases the difficulty of impeller replacement, and forcing the replacement can easily cause excessive wear on the hexagonal head of the impeller nut, further increasing the difficulty and maintenance cost. Based on these problems, this improvement was developed. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic pump head structure that enables convenient impeller replacement, thereby reducing the difficulty and cost of later maintenance.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a magnetic pump head structure, including a pump casing, a pump cover installed on the pump casing, a pump cavity formed between the pump casing and the pump cover, an impeller disposed in the pump cavity, a main shaft connected to the impeller and extending to the outside, and a nut threadedly connected to the main shaft and used to fasten the impeller. The nut is split into at least two nut blocks along its axial direction. The nut blocks have a mating state and a disassembled state in which they cooperate to form a screw hole. A fixing member is fitted on the nut blocks to fix the nut blocks in the mating state.

[0007] By adopting the above technical solution, the fixing components and nut blocks are in a mating state, thereby achieving a threaded connection between the nut blocks and the main shaft to fix the impeller to the main shaft. When it is necessary to replace a damaged impeller, the fixing components can be broken to separate the nut blocks, switching them to a disassembled state, thereby achieving convenient separation from the main shaft and facilitating the replacement of the impeller, reducing the difficulty and cost of later maintenance. After replacing the new impeller, the nut blocks are fixed with new fixing components, and the subsequent thread tightening operation can begin.

[0008] The setting is further configured such that: the fixing member is a binding member that is fixed to the nut block, and a detachable positioning component is provided between the nut blocks to position the nut blocks in a cooperating state.

[0009] By adopting the above technical solution, the binding component is bound and fixed to the outer periphery of the nut block, thereby achieving circumferential fastening between the nut blocks. In conjunction with the positioning component, the limiting force between the nut blocks is further enhanced, thereby improving the stability of the mating structure between the nut blocks in the mating state, so as to ensure that it can achieve stable locking of the impeller and improve the feasibility of the solution.

[0010] The positioning component is further configured such that: the positioning component includes a plurality of positioning posts disposed on one of the nut blocks and a plurality of positioning holes disposed on the other nut block for the positioning posts to be inserted into in order to restrict the movement of the nut block axis, wherein the plurality of positioning posts and the plurality of positioning holes are configured in a one-to-one correspondence.

[0011] By adopting the above technical solution, the cooperation between the positioning pin and the positioning hole forms a limit on the nut block along its axial direction, thereby improving the structural stability in the mating state.

[0012] A further configuration is provided: when the nut blocks are in a mating state, the free end of the positioning pin protrudes from the positioning hole to form a separation protrusion.

[0013] By adopting the above technical solution, when the nut block needs to be disassembled, by applying force to the separation protrusion protruding from the positioning hole, the nut block connected to the positioning post can be driven to move in opposite directions along the main shaft, thereby achieving convenient separation between adjacent nut blocks.

[0014] A further configuration is provided: when the nut blocks are in a mating state, the outer peripheral wall of the nut block is formed with a positioning groove for the installation of the binding component.

[0015] By adopting the above technical solution, the positioning groove limits the fixed binding parts, ensuring the stability of their installation position.

[0016] A further configuration is provided: when the nut blocks are in a mating state, one of the nut blocks has an inwardly recessed cutting groove on its exposed outer wall, and the cutting groove corresponds to the binding member.

[0017] By adopting the above technical solution, the fastener can be cut and destroyed by a cutting tool through the set cutting groove, making the destruction and separation operation of the fastener more convenient.

[0018] The cutting groove is further configured to simultaneously penetrate the outer peripheral wall and end face of the nut block.

[0019] By adopting the above technical solution, it is convenient for cutting tools to cut fasteners from multiple angles.

[0020] A further configuration is provided: a flow guide is inserted and fixed to the end face of the main shaft, and the flow guide covers the end face of the nut.

[0021] By adopting the above technical solution, the design of the flow guide reduces the erosion of the spindle and nut by the fluid, extending their service life while reducing vibration caused by erosion. Furthermore, the plug-in structure allows for convenient assembly and disassembly of the flow guide.

[0022] A further configuration is provided: a cooling chamber is formed on the side of the pump cover opposite to the pump chamber.

[0023] By adopting the above technical solution, the cooling chamber reduces the temperature conduction to the drive source, thereby extending the service life of the drive source.

[0024] In summary, this utility model has the following beneficial effects: it enables convenient replacement of the impeller, thereby reducing the difficulty and cost of later maintenance of the product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0026] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0027] Figure 3 This is a partial structural diagram of an embodiment;

[0028] Figure 4 This is a partial exploded view of an embodiment.

[0029] In the diagram: 1. Pump casing; 2. Pump cover; 3. Pump chamber; 4. Impeller; 5. Main shaft; 6. Nut block; 7. Binding piece; 81. Positioning post; 82. Positioning hole; 9. Separation protrusion; 10. Positioning groove; 11. Cutting groove; 12. Drainage cover; 13. Cooling chamber. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] refer to Figures 1 to 4 A magnetic pump head structure includes a pump housing 1, a pump cover 2 mounted on the pump housing 1, a pump chamber 3 formed between the pump housing 1 and the pump cover 2, an impeller 4 disposed within the pump chamber 3, a main shaft 5 connecting the impeller 4 and extending to the outside, and a nut threadedly connected to the main shaft 5 for fastening the impeller 4. The nut is axially split into at least two nut blocks 6, preferably two in number. The nut blocks 6 have a mating state and a disassembled state where they cooperate to form a threaded hole. A fixing element is fitted onto the nut blocks 6 to secure them in the mating state. Bolts pass through the pump cover 2 and are threadedly connected to the pump housing 1 to achieve the fixation of both. The main shaft 5 and the pump cover 2 are in a sealed rotational engagement.

[0032] The fastener is a strapping member 7 that is fixed to the nut block 6. A detachable positioning assembly is provided between the nut blocks 6 to position them in a mating state. The strapping member 7 is a metal cable tie. The positioning assembly includes multiple positioning posts 81 fixedly set on one of the nut blocks 6 and multiple positioning holes 82 opened on the other nut block 6 for the positioning posts 81 to be inserted to restrict the axial movement of the nut block 6. The multiple positioning posts 81 and the multiple positioning holes 82 are arranged one-to-one.

[0033] When the nut blocks 6 are in the mating state, the free end of the positioning post 81 protrudes from the positioning hole 82 to form a separation protrusion 9. When the nut blocks 6 are in the mating state, a positioning groove 10 for the binding member 7 is formed on the outer peripheral wall of the nut block 6. When the nut blocks 6 are in the mating state, an inwardly recessed cutting groove 11 is formed on the exposed outer wall of one of the nut blocks 6, and the cutting groove 11 corresponds to the binding member 7, that is, the cutting groove 11 is connected to the positioning groove 10.

[0034] The cutting groove 11 simultaneously penetrates the outer peripheral wall and end face of the nut block 6. A flow guide 12 is inserted into the end face of the spindle 5 and covers the end face of the nut. The flow guide 12 is made of plastic material, specifically polyvinylidene fluoride. The plastic material of the flow guide 12 does not easily cause jamming at the insertion position. A cooling chamber 13 is formed on the side of the pump cover 2 opposite to the pump chamber 3.

[0035] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A magnetic pump head structure, comprising a pump housing (1), a pump cover (2) mounted on the pump housing (1), a pump chamber (3) formed between the pump housing (1) and the pump cover (2), an impeller (4) disposed within the pump chamber (3), a main shaft (5) connecting the impeller (4) and extending to the outside, and a nut threadedly connected to the main shaft (5) for fastening the impeller (4), characterized in that: The nut is split into at least two nut blocks (6) along its axial direction. The nut blocks (6) have a mating state and a disassembled state in which they cooperate to form a screw hole. A fastener is fitted on the nut blocks (6) to fix the nut blocks (6) in the mating state.

2. The magnetic pump head structure according to claim 1, characterized in that: The fastener is a binding member (7) that is fixed to the nut block (6), and a detachable positioning component is provided between the nut blocks (6) to position the nut blocks (6) in a cooperating state.

3. The magnetic pump head structure according to claim 2, characterized in that: The positioning component includes a plurality of positioning pins (81) disposed on one of the nut blocks (6) and a plurality of positioning holes (82) disposed on the other nut block (6) for the positioning pins (81) to be inserted to restrict the movement of the axial direction of the nut block (6). The plurality of positioning pins (81) and the plurality of positioning holes (82) are arranged in a one-to-one correspondence.

4. The magnetic pump head structure according to claim 3, characterized in that: When the nut blocks (6) are in a mating state, the free end of the positioning pin (81) protrudes out of the positioning hole (82) to form a separation protrusion (9).

5. The magnetic pump head structure according to claim 2, characterized in that: When the nut blocks (6) are in a mating state, the outer peripheral wall of the nut blocks (6) has a positioning groove (10) for the binding component (7) to be inserted.

6. The magnetic pump head structure according to claim 2, characterized in that: When the nut blocks (6) are in a mating state, one of the nut blocks (6) has an inwardly recessed cutting groove (11) on its exposed outer wall, and the cutting groove (11) corresponds to the binding member (7).

7. The magnetic pump head structure according to claim 6, characterized in that: The cutting groove (11) simultaneously penetrates the outer peripheral wall and end face of the nut block (6).

8. The magnetic pump head structure according to claim 1, characterized in that: The main shaft (5) is fixedly connected to a flow guide (12), which covers the end face of the nut.

9. The magnetic pump head structure according to claim 1, characterized in that: The side of the pump cover (2) opposite to the pump chamber (3) forms a cooling chamber (13).

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