Vacuum double-layer isolation sleeve

Abstract

The utility model relates to the technical field of isolation sleeves, and discloses a vacuum double-layer isolation sleeve which comprises an isolation inner layer sleeve, a pressing plate, an isolation outer layer sleeve and a sensor. A sensor is arranged on the outer surface of the isolation inner layer sleeve. The two ends of the isolation outer layer sleeve are located between the pressing plate and the isolation inner layer sleeve. And an air exhaust hole is formed in the isolation inner layer sleeve. The exhaust hole in the isolation inner layer sleeve is connected with a one-way valve. A vacuum layer is formed between the isolation inner layer sleeve and the isolation outer layer sleeve. And an air exhaust hole in the isolating inner layer sleeve is communicated with the vacuum layer. The sensor is arranged in the vacuum layer. According to the utility model, the isolation outer layer sleeve is attached to the outer layer surface of the isolation inner layer sleeve through vacuumizing. When a certain vacuum degree exists in the vacuum layer, the isolation outer layer sleeve compresses the isolation inner layer sleeve under the action of atmospheric pressure. The resistance value of the sensor is constant. If the isolation inner layer sleeve leaks and leaks, the vacuum state of the vacuum layer is damaged, the pressure value borne by the sensor changes instantly, the resistance value drops, and an alarm is given to achieve the purpose of leakage monitoring.

Description

Technical Field

[0001] The utility model relates to the technical field of isolation sleeves, in particular to a vacuum double-layer isolation sleeve. Background Art

[0002] The magnetic drive technology used by the magnetic pump can achieve contactless torque transmission and completely convert the dynamic seal into a static seal. The isolation sleeve is the main sealing component of the magnetic pump, which completely separates the medium from the outside world. The isolation sleeve is usually placed between the inner magnetic rotor and the outer magnetic rotor. The isolation sleeve is mostly made of metal materials with high resistivity such as 316L, HC-276, and TC4. When the magnetic pump is working normally, the metal isolation sleeve is affected by the sinusoidal alternating magnetic field and generates an induced current. The induced current closes on the isolation sleeve to form an eddy current. The eddy current is eventually converted into heat for release. With the development of magnetic pump technology, the isolation sleeve, as the main sealing component, also bears a certain amount of pressure. For safety and environmental protection considerations, the isolation sleeve requires secondary protection, so the double-layer isolation sleeve came into being.

[0003] At present, there are many forms of double-layer isolation sleeves, mainly non-metallic double-layer isolation sleeves and metallic double-layer isolation sleeves.

[0004] The inner layer of the non-metallic double-layer isolation sleeve is mostly supported by corrosion-resistant materials, and the outer layer is made of composite carbon fiber materials. However, the application range of non-metallic double-layer isolation sleeves is often limited due to the pressure they can withstand. Double-layer metal isolation sleeves can provide good secondary protection, but the cost of double-layer metal isolation sleeves is relatively high. The double-layer structure is destined to increase the thickness, so the cross-sectional area of ​​the isolation sleeve in the thickness direction is increased, and the induced current generated by the cutting of the rotating magnetic field is also increased, and the eddy current thermal effect is obvious. Therefore, in order to overcome this phenomenon, double-layer metal isolation sleeves often use high-resistivity alloys for the inner and outer layers, so the cost is relatively high.

[0005] In order to solve the above problems, we propose a vacuum double-layer isolation sleeve. Utility Model Content

[0006] The purpose of the utility model is to provide a vacuum double-layer isolation sleeve to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vacuum double-layer isolation sleeve, comprising an isolation inner sleeve, a pressure plate, an isolation outer sleeve and a sensor;

[0008] The sensor is provided on the outer surface of the isolation inner sleeve; both ends of the isolation outer sleeve are located between the pressure plate and the isolation inner sleeve; an exhaust hole is opened on the isolation inner sleeve; the exhaust hole on the isolation inner sleeve is connected to a one-way valve; a vacuum layer is formed between the isolation inner sleeve and the isolation outer sleeve; the exhaust hole on the isolation inner sleeve is connected to the vacuum layer; the sensor is arranged in the vacuum layer.

[0009] Preferably, the pressing plate is connected to the insulating inner sleeve via a connecting piece.

[0010] Preferably, the sensor is provided with a wiring terminal and a pressure-bearing part at both ends respectively; the pressure-bearing part is arranged between the isolation outer sleeve and the isolation inner sleeve; and the wiring terminal extends out of the isolation inner sleeve.

[0011] Preferably, the isolation outer layer sleeve is made of polytetrafluoroethylene; the thickness of the isolation outer layer sleeve is 1 mm.

[0012] Preferably, the sensor is a flexible film pressure sensor.

[0013] Preferably, the one-way valve is threadedly connected to the isolation inner sleeve; and thread glue is added to the threads of the isolation inner sleeve.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the vacuum double-layer isolation sleeve is vacuumized so that the isolation outer sleeve is attached to the outer surface of the isolation inner sleeve. When the vacuum layer has a certain vacuum degree, the isolation outer sleeve presses the isolation inner sleeve under the action of atmospheric pressure. The sensor is subjected to pressure and the resistance value is constant. If the isolation inner sleeve leaks or seepage occurs, the vacuum state of the vacuum layer is destroyed, the pressure value of the sensor changes instantly, the resistance value drops and an alarm is sounded to achieve the purpose of leak monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: 1-isolation inner sleeve, 2-check valve, 3-pressure plate, 4-connector, 5-isolation outer sleeve, 6-sensor, 7-connection terminal, 8-vacuum layer, 9-pressure-bearing part. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1 The utility model provides a technical solution: a vacuum double-layer isolation sleeve, including an isolation inner sleeve 1, a pressure plate 3, an isolation outer sleeve 5 and a sensor 6.

[0019] The sensor 6 is provided on the outer surface of the isolation inner sleeve 1. Both ends of the isolation outer sleeve 5 are located between the pressure plate 3 and the isolation inner sleeve 1. The isolation inner sleeve 1 is provided with an air extraction hole. The air extraction hole on the isolation inner sleeve 1 is connected to a one-way valve 2. A vacuum layer 8 is formed between the isolation inner sleeve 1 and the isolation outer sleeve 5. The air extraction hole on the isolation inner sleeve 1 is connected to the vacuum layer 8. The sensor 6 is arranged in the vacuum layer 8.

[0020] Furthermore, the pressing plate 3 is connected to the isolation inner sleeve 1 via a connecting piece 4 .

[0021] Furthermore, the two ends of the sensor 6 are respectively provided with a wiring terminal 7 and a pressure-bearing portion 9. The pressure-bearing portion 9 is arranged between the isolation outer sleeve 5 and the isolation inner sleeve 1. The wiring terminal 7 extends out of the isolation inner sleeve 1.

[0022] Furthermore, the isolation outer layer sleeve 5 is polytetrafluoroethylene. The thickness of the isolation outer layer sleeve 5 is 1 mm. Polytetrafluoroethylene is a high molecular polymer obtained by polymerization of tetrafluoroethylene as a monomer. It has excellent heat resistance and cold resistance and can be used for a long time at -180 to 260°C. This material has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance.

[0023] Furthermore, the sensor 6 is a flexible film pressure sensor.

[0024] Further, the one-way valve 2 is threadedly connected to the isolation inner sleeve 1. Thread glue is added to the thread of the isolation inner sleeve 1.

[0025] A new type of composite double-layer isolation sleeve is designed. The isolation inner sleeve 1 is made of metal material and mainly bears the pressure during operation. The isolation outer sleeve 5 is a corrosion-resistant film made of non-metallic polytetrafluoroethylene (PTFE) with a thickness of 1 mm. The isolation outer sleeve 5 is attached to the outer surface of the isolation inner sleeve 1 by vacuuming.

[0026] The sensor 6 is arranged between the isolation outer sleeve 5 and the isolation inner sleeve 1. The sensor 6 adopts a flexible film pressure sensor, and the sensor 6 is a resistive type in the utility model. When there is a certain vacuum degree between the isolation outer sleeve 5 and the isolation inner sleeve 1, the isolation outer sleeve 5 presses the isolation inner sleeve 1 under the action of atmospheric pressure. The sensor 6 between the isolation outer sleeve 5 and the isolation inner sleeve 1 is subjected to a certain pressure, and the resistance value is constant. If the isolation inner sleeve 1 leaks or seepage occurs, the vacuum state of the vacuum layer 8 is destroyed, and the pressure value of the sensor 6 changes instantly, the resistance value decreases and an alarm is sounded. The purpose of leak monitoring is achieved.

[0027] Working principle:

[0028] The sensor 6 is placed on the outer surface of the isolation inner sleeve 1, and the wiring terminals are led out to the outer edge of the flange. Then, the 5-isolation sleeve outer layer is attached to the isolation sleeve inner layer and pressed using the pressing plate 3. Finally, the one-way valve 2 is installed on the flange of the isolation inner sleeve 1. An exhaust hole connected to the vacuum layer 8 is opened on the flange of the isolation inner sleeve 1.

[0029] After installation is completed, the air in the vacuum layer 8 between the isolation inner layer sleeve 1 and the isolation outer layer sleeve 5 is extracted through the one-way valve 2, so that the isolation inner layer sleeve 1 and the isolation outer layer sleeve 5 are tightly fitted together, so that a vacuum state is formed inside. The pressure-bearing part 9 on the sensor 6 is subjected to the action of the external atmospheric pressure (such as Figure 1 The pressure receiving portion 9 is subjected to a certain pressure. The wiring terminal 7 can be used for wiring type voltage module, PLC, etc.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A vacuum double-layer isolation sleeve, It is characterized in that It comprises an isolation inner sleeve (1), a pressure plate (3), an isolation outer sleeve (5) and a sensor (6); The sensor (6) is provided on the outer surface of the isolation inner sleeve (1); both ends of the isolation outer sleeve (5) are located between the pressure plate (3) and the isolation inner sleeve (1); an air suction hole is provided on the isolation inner sleeve (1); the air suction hole on the isolation inner sleeve (1) is connected to a one-way valve (2); a vacuum layer (8) is formed between the isolation inner sleeve (1) and the isolation outer sleeve (5); the air suction hole on the isolation inner sleeve (1) is connected to the vacuum layer (8); the sensor (6) is arranged in the vacuum layer (8).

2. A vacuum double-layer isolation sleeve according to claim 1, It is characterized in that The pressing plate (3) is connected to the insulating inner sleeve (1) via a connecting piece (4).

3. A vacuum double-layer isolation sleeve according to claim 1, It is characterized in that The sensor (6) is provided with a wiring terminal (7) and a pressure-bearing portion (9) at both ends; the pressure-bearing portion (9) is arranged between the isolation outer sleeve (5) and the isolation inner sleeve (1); and the wiring terminal (7) extends out of the isolation inner sleeve (1).

4. A vacuum double-layer isolation sleeve according to claim 1, It is characterized in that The isolation outer layer sleeve (5) is made of polytetrafluoroethylene; the thickness of the isolation outer layer sleeve (5) is 1 mm.

5. A vacuum double-layer isolation sleeve according to claim 1, It is characterized in that The sensor (6) is a flexible thin film pressure sensor.

6. A vacuum double-layer isolation sleeve according to claim 1, It is characterized in that The one-way valve (2) is threadedly connected to the isolation inner sleeve (1); thread glue is added to the thread of the isolation inner sleeve (1).

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