A magnetic pump isolation sleeve

Abstract

The utility model discloses an isolating bush for magnetic force pump, including sleeve and the flange disc of sleeve one end, the sleeve is inside and outside double -layer structure, and the inside and outside layer of sleeve has the clearance and forms the flow passage between, and the flow passage is provided with the flow guide member for guiding the flow in, the flange disc is equipped with the annular cavity that communicates with the flow passage, the periphery of annular cavity is linked with the movable cavity, the utility model discloses utilize the dynamic monitoring mechanism of leakproof float, through the spiral septum in flow passage guide leakage medium to enter annular cavity, push leakproof float and float under the hydraulic action radially, and the guide rod is stretched out from the flange disc through -hole, and the warning mark (such as color mark or magnetic trigger device) is combined to realize visual real -time early warning, need not external monitoring equipment, and the axial displacement of guide rod can be directly exposed to the external environment, and the operator can judge the isolating bush breakage position and take the measures quickly, and relative to prior art can realize the monitoring of the inner layer breakage of isolating bush in the closed environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of magnetic pumps, specifically relating to an isolation sleeve for magnetic pumps. Background Technology

[0002] The isolation sleeve in a magnetic pump is one of the core components that ensures leak-free operation. The isolation sleeve isolates the pump's internal medium from the external environment, preventing leakage, while simultaneously transmitting the magnetic drive torque. Located inside the pump body, it surrounds the inner magnetic rotor and separates it from the outer magnetic rotor, forming a sealed cavity.

[0003] A search revealed that CN209145900U discloses a double-layer isolation sleeve for a magnetic pump, comprising an outer isolation sleeve and an inner isolation sleeve. Both the inner and outer isolation sleeves are composed of a flange, a cylinder, and a bottom. The inner isolation sleeve is fitted inside the outer isolation sleeve, with the flange of the inner isolation sleeve tightly fitted against the flange of the outer isolation sleeve. The wall thickness of the cylinder and bottom of the inner isolation sleeve is 0.4-1.5 mm. A clearance fit is used between the inner and outer isolation sleeves, with a clearance of 0.01-0.19 mm between the cylinders and 0.01-1 mm between the bottoms. A leakage monitoring port is provided on the flange of the outer isolation sleeve, communicating with the clearance between the inner and outer isolation sleeves. This double-layer isolation sleeve provides leakage monitoring while reducing the overall wall thickness, thus reducing the magnetic gap between the inner and outer magnetic rotors, decreasing the amount of magnets used, and lowering manufacturing costs. It also reduces eddy current losses.

[0004] However, the above-mentioned double-layer isolation sleeve technology for magnetic pumps still has the following problems: the double-layer isolation sleeve for magnetic pumps is achieved by setting a leakage monitoring port on the flange. Since the leakage monitoring port directly vents to the outside, when the inner isolation sleeve is damaged, the fluid inside the pump can easily leak directly from the leakage monitoring port, resulting in fluid pollution and waste. Utility Model Content

[0005] The purpose of this invention is to provide an isolation sleeve for a magnetic pump, so as to solve the problem mentioned in the background art that direct discharge of the leakage monitoring port to the outside can easily cause fluid pollution and waste.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an isolation sleeve for a magnetic pump, comprising a sleeve and a flange located at one end of the sleeve. The sleeve has an inner and outer double-layer structure, with a gap between the inner and outer layers to form a flow channel. A flow guide is provided in the flow channel. The flange has an annular cavity communicating with the flow channel. A movable cavity is connected to the periphery of the annular cavity. A leak-proof float plug that floats radially according to hydraulic pressure changes is provided in the movable cavity. A through hole communicating axially with the movable cavity is opened on the surface of the flange.

[0007] Preferably, the flow guide includes a spiral partition, which is spirally distributed between the inner and outer layers of the sleeve.

[0008] Preferably, the leak-proof float includes a plug body, the plug body is slidably limited within the movable cavity, a guide rod is fixed on the plug body, a spring is sleeved on the outer side of the guide rod, one end of the spring abuts against the plug body, and the other end of the spring abuts against the inner wall of the movable cavity.

[0009] Preferably, the end of the movable cavity near the annular cavity is a tapered cavity that gradually narrows, and the remaining part of the movable cavity, excluding the tapered opening, is a cylindrical cavity.

[0010] Preferably, the lower half of the plug is a conical segment that mates with the conical cavity of the movable cavity, and the upper half of the plug is a cylindrical segment that mates with the cylindrical cavity of the movable cavity.

[0011] Preferably, the guide rod can extend axially outward from the through hole.

[0012] Preferably, the guide rod is fitted with a warning label around its outer edge.

[0013] Compared with the prior art, the present invention provides an isolation sleeve for a magnetic pump, which has the following advantages:

[0014] 1. This utility model utilizes a dynamic monitoring mechanism for a leak-proof floating plug. The leaking medium is guided into the annular cavity by a spiral baffle inside the flow channel, which pushes the leak-proof floating plug to float radially under hydraulic pressure. The guide rod extends out from the flange through hole, and combined with warning signs (such as color markings or magnetic triggering devices), a visual real-time early warning is achieved. No external monitoring equipment is required, and the axial displacement of the guide rod can be directly exposed to the external environment. Operators can quickly determine the location of the isolation sleeve damage and take measures. Moreover, compared with the prior art, it can monitor the damage to the inner layer of the isolation sleeve in a closed environment.

[0015] 2. The spiral baffle of this utility model has the functions of guiding and supporting. The spiral baffle in the flow channel not only guides the flow of the leaking medium, but also forms radial support for the inner and outer sleeves through the spiral structure, disperses local pressure, and delays the expansion of damage. The flow channel formed by the gap between the inner and outer layers can temporarily accommodate the leaking medium and reduce the impact of sudden leakage on the pump body. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of an isolation sleeve for a magnetic pump proposed in this utility model;

[0018] Figure 2 This is a partial cross-sectional view of the sleeve structure proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the overall half-section structure of the isolation sleeve for a magnetic pump proposed in this utility model;

[0020] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0021] Figure 5 This is a schematic diagram of the anti-leakage float plug structure proposed in this utility model;

[0022] In the diagram: 1. Flange; 11. Annular cavity; 12. Movable cavity; 13. Through hole; 2. Sleeve; 21. Flow channel; 3. Spiral partition; 4. Leak-proof float plug; 41. Plug body; 42. Spring; 43. Guide rod; 44. Warning sign. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a technical solution: an isolation sleeve for a magnetic pump, including a sleeve 2 and a flange 1 located at one end of the sleeve 2. The sleeve 2 has an inner and outer double-layer structure, with a gap between the inner and outer layers of the sleeve 2 to form a flow channel 21. A flow guide is provided in the flow channel 21 for guiding the flow. The flange 1 has an annular cavity 11 communicating with the flow channel 21. A movable cavity 12 is connected to the periphery of the annular cavity 11. A leak-proof float 4 that floats radially according to hydraulic pressure changes is provided in the movable cavity 12. A through hole 13 that communicates axially with the movable cavity 12 is opened on the surface of the flange 1. Using the dynamic monitoring mechanism of the leak-proof float 4, the leaking medium is guided into the annular cavity 11 through the flow guide in the flow channel, pushing the leak-proof float 4 to float radially under hydraulic pressure, so as to achieve a visual real-time early warning.

[0025] Please see Figure 2The flow guiding component includes a spiral baffle 3, which is spirally distributed between the inner and outer layers of the sleeve 2. The spiral baffle 3 has the functions of guiding and supporting. The spiral baffle 3 in the flow channel 21 not only guides the flow of the leaking medium, but also forms radial support for the inner and outer sleeves 2 through the spiral structure, disperses local pressure, and delays the expansion of damage. The flow channel 21 formed by the gap between the inner and outer layers can temporarily contain the leaking medium and reduce the impact of sudden leakage on the pump body.

[0026] Please see Figure 4 and Figure 5 The anti-leakage float 4 includes a plug body 41, which is slidably located within the movable cavity 12. A guide rod 43 is fixed on the plug body 41, and a spring 42 is sleeved on the outside of the guide rod 43. One end of the spring 42 abuts against the plug body 41, and the other end of the spring 42 abuts against the inner wall of the movable cavity 12.

[0027] Furthermore, the end of the movable cavity 12 near the annular cavity 11 is a tapered cavity that gradually narrows. The remaining part of the movable cavity 12, except for the tapered opening, is a cylindrical cavity. The lower half of the plug body 41 is a tapered section that mates with the tapered cavity of the movable cavity 12. The upper half of the plug body 41 is a cylindrical section that mates with the cylindrical cavity of the movable cavity 12. The tapered section of the plug body 41 and the tapered cavity of the movable cavity 12 form a self-tightening sealing structure. Under normal operating conditions, the preload of the spring 42 ensures the sealing performance. In case of leakage, the hydraulically driven float compresses the spring 42, achieving the coordinated operation of dynamic sealing and early warning.

[0028] Furthermore, the guide rod 43 can extend outward axially from the through hole 13, and a warning mark 44 is fixedly sleeved on the outside of the guide rod 43. The linkage design of the guide rod 43 and the warning mark 44 avoids the complexity of electronic sensors and reduces maintenance frequency and cost.

[0029] The working principle and usage process of this utility model: The sleeve 2 is composed of an inner and outer double-layer structure, and a gap is left between the inner and outer layers to form a flow channel 21. The spiral partition 3 in the flow channel 21 supports the inner and outer double-layer structure, thereby improving the structural stability of the sleeve 2. The spiral partition 3 can also guide the fluid to the annular cavity 11 when the inner layer structure is damaged, so that it enters through the conical opening of the movable cavity 12, allowing the plug 41 to overcome the elastic force of the spring 42 under hydraulic action and slide radially, so that the guide rod 43 extends out from the through hole 13 on the surface of the flange 1. Thus, the warning mark 44 on the outside of the guide rod 43 can be used to determine that the sleeve 2 is damaged and indicate that it needs to be replaced in time.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An isolation sleeve for a magnetic pump, comprising a sleeve (2) and a flange (1) located at one end of the sleeve (2), characterized in that: The sleeve (2) has a double-layer structure with an inner and outer layer. A gap is left between the inner and outer layers of the sleeve (2) to form a flow channel (21). A flow guide is provided in the flow channel (21) for guiding the flow. An annular cavity (11) communicating with the flow channel (21) is provided in the flange (1). A movable cavity (12) is connected to the periphery of the annular cavity (11). A leak-proof float plug (4) that floats radially according to the hydraulic pressure change is provided in the movable cavity (12). A through hole (13) communicating with the movable cavity (12) is opened on the surface of the flange (1).

2. The isolation sleeve for a magnetic pump according to claim 1, characterized in that: The flow guide includes a spiral partition (3), which is spirally distributed between the inner and outer layers of the sleeve (2).

3. The isolation sleeve for a magnetic pump according to claim 1, characterized in that: The leak-proof float plug (4) includes a plug body (41), the plug body (41) is slidably located in the movable cavity (12), a guide rod (43) is fixed on the plug body (41), a spring (42) is sleeved on the outside of the guide rod (43), one end of the spring (42) abuts against the plug body (41), and the other end of the spring (42) abuts against the inner wall of the movable cavity (12).

4. The isolation sleeve for a magnetic pump according to claim 3, characterized in that: The movable cavity (12) is a tapered cavity that gradually narrows at one end near the annular cavity (11), and the remaining part of the movable cavity (12) except for the tapered opening is a cylindrical cavity.

5. The isolation sleeve for a magnetic pump according to claim 4, characterized in that: The lower half of the plug (41) is a conical segment that mates with the conical cavity of the movable cavity (12), and the upper half of the plug (41) is a cylindrical segment that mates with the cylindrical cavity of the movable cavity (12).

6. The isolation sleeve for a magnetic pump according to claim 3, characterized in that: The guide rod (43) can extend outward axially from the through hole (13).

7. The isolation sleeve for a magnetic pump according to claim 6, characterized in that: The guide rod (43) is fixedly fitted with a warning sign (44).

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