Gas shield pump

Abstract

The utility model discloses a gas shield pump which comprises a pump body and a motor body, a liquid inlet channel is arranged on the pump body, a gas cavity communicated with the liquid inlet channel is further arranged on the pump body, a sealed inner cavity is arranged in the motor body, and a communication channel for communicating the sealed inner cavity with the gas cavity is arranged on the motor body. According to the gas shielding motor provided by the utility model, gas in the pump forms a gas layer in the sealed inner cavity in the motor in a reversed buckling state, so that water can be prevented from entering the sealed inner cavity.

Description

Technical Field

[0001] The utility model relates to the field of pumps, in particular to a gas shielding pump. Background Art

[0002] The existing canned motor consists of a pump body, a pump cover, an impeller and a canned motor. The canned motor in the canned pump generates heat during operation, and the high-speed rotating bearings also need lubrication. The canned motor is cooled and the bearings are lubricated by the conveying medium flowing from the high-pressure end of the pump through the motor to the low-pressure end of the pump. There are several problems with the canned motor: 1. The rotor rotates in the liquid, with large resistance and power loss, and a small gap with the stator, so it cannot convey particles or easy-to-crystallize media. 2. In order to reduce the loss of the rotor in the liquid, special design is required to ensure a reasonable aspect ratio. 3. The rotor and stator are all located in the conveying medium, and the corrosion intensity is high. 4. If the pump is running at a small flow rate, the coolant flow rate will decrease, resulting in poor cooling effect. 5. It is not suitable for media with high viscosity and poor cooling effect.

[0003] Patent No. "CN102280965B" discloses a "shielded motor for a vacuum pump", but the motor in this patent places the motor body in a vacuum environment and is not used to solve the problem of cooling medium. The working medium and the gas medium inside the motor are consistent. The particles and components of the working medium will enter the inside of the motor, corrode or wear the shielding sleeve, and the isolation of the working medium from the inside of the motor cannot be achieved. Utility Model Content

[0004] The utility model aims to provide a gas shielding pump.

[0005] The innovation of the utility model is that the gas shielding motor utilizes the inverted state, and the gas inside the pump forms a gas layer in the sealed inner cavity inside the motor, which can prevent water or working medium from entering the sealed inner cavity.

[0006] To achieve the above-mentioned purpose of the utility model, the technical solution of the utility model is: a gas shielding pump, including a pump body and a motor body, the pump body is provided with a liquid inlet channel, the pump body is also provided with an air cavity connected to the liquid inlet channel, the motor body is provided with a sealed inner cavity, and the motor body is provided with a connecting channel connecting the sealed inner cavity and the air cavity.

[0007] Furthermore, the air cavity and the pump body are of split structure or integrally formed. The integrally formed structure has the characteristics of simple structure and convenient maintenance; the split pump has low replacement cost.

[0008] Furthermore, the motor body comprises a motor housing, an upper end cover, and a lower end cover, and the communication channel is located on the lower end cover.

[0009] Furthermore, a stator and a rotor are disposed in the motor body, and a sealed inner cavity is formed between the inner side of the stator, the outer side of the rotor, the bottom surface of the upper end cover, and the top surface of the lower end cover.

[0010] Furthermore, a stator shield is provided on the inner side of the stator, and a rotor shield or shielding layer is provided on the outer side of the rotor; a sealed inner cavity is formed between the inner side of the stator shield, the outer side of the rotor shield or shielding layer, the bottom surface of the upper end cover, and the top surface of the lower end cover.

[0011] Furthermore, the stator shield is welded to the motor housing, a rotating shaft is arranged inside the rotor, and the rotor shield is welded to the rotating shaft.

[0012] Furthermore, the upper end of the stator shield supports the upper end cover, and the lower end supports the lower end cover, which is convenient for installation and disassembly.

[0013] Furthermore, the motor body is provided with an external circulation pipeline, and the inlet and outlet of the external circulation pipeline are both connected to the sealed inner cavity. The gas in the sealed inner cavity is connected to the external circulation pipeline, so that the gas in the sealed cavity is cooled better in the external circulation pipeline.

[0014] Furthermore, the inlet and outlet of the external circulation pipeline are respectively located on the upper end cover and the lower end cover.

[0015] Furthermore, a cavity is provided on the motor housing and / or the upper end cover and the lower end cover, and a cooling inlet and a cooling outlet are provided on the cavity to further cool the motor.

[0016] The beneficial effects of the utility model are:

[0017] 1. In the utility model, the gas shielded motor is in an inverted state, and the gas inside the pump forms a gas layer in the sealed inner cavity inside the motor, which can prevent water from entering the sealed inner cavity.

[0018] 2. In the utility model, the conveying medium forms a gas-liquid interface in the gas cavity under the working pressure or the liquid inlet pressure, so that the motor and the pump body are isolated by the gas, the working medium will not enter the inside of the motor, and the particles, viscosity and corrosiveness of the medium will not damage the motor. It can be widely used in the conveying of working media containing particles, corrosiveness and easy crystallization.

[0019] 3. In the utility model, the motor output end and the gas chamber are connected, and effective and stable sealing can be achieved without a rotating seal (mechanical seal, power seal), eliminating leakage caused by damage to the rotating seal, and there is no loss of the rotating seal; without a rotating seal, the water pump will not be damaged due to heat generation of the seal when the liquid is cut off; there is no mechanical loss of the bearing seat bearing, bearing seal, and water pump sealing parts, and the water pump has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of Example 1.

[0021] Figure 2 This is a schematic diagram of the structure of Example 2. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0023] Example 1: Figure 1 As shown, a gas shielding pump comprises a pump body 1 and a motor body 2. The pump body 1 is provided with a liquid inlet channel 3. The pump body 1 is also provided with an air cavity 4 connected with the liquid inlet channel 3. The air cavity 4 and the pump body 1 are split structures. A sealed inner cavity 5 is provided in the motor body 2. The motor body 2 is provided with a connecting channel 6 connecting the sealed inner cavity 5 and the air cavity 4.

[0024] The motor body 2 comprises a motor housing 2.1, an upper end cover 2.2, and a lower end cover 2.3, and the communication channel 6 is located on the lower end cover 2.3.

[0025] A stator 7 and a rotor 8 are provided in the motor body 2, and a sealed inner cavity 5 is formed between the inner side of the stator 7, the outer side of the rotor 8, the bottom surface of the upper end cover 2.2, and the top surface of the lower end cover 2.3; a stator shielding cover 9 is provided on the inner side of the stator 7, and a rotor shielding cover 10 or a shielding layer 11 is provided on the outer side of the rotor 8; a sealed inner cavity 5 is formed between the inner side of the stator shielding cover 9, the rotor shielding cover 10, the bottom surface of the upper end cover 2.2, and the top surface of the lower end cover 2.3; the stator shielding cover 9 is welded to the motor housing 2.1, a rotating shaft 12 is provided in the rotor 8, and the rotor shielding cover 9 is welded to the rotating shaft 12.

[0026] The motor body 2 is provided with an external circulation pipeline 13, the inlet and outlet of which are both connected to the sealed inner cavity 5; the inlet and outlet of the external circulation pipeline 13 are respectively located on the upper end cover 2.2 and the lower end cover 2.3.

[0027] Example 2: Figure 2 As shown, a gas shielding pump includes a pump body 1 and a motor body 2. The pump body 1 is provided with a liquid inlet channel 3, and the pump body 1 is also provided with an air cavity 4 connected with the liquid inlet channel 3. A sealed inner cavity 5 is provided in the motor body 2, and a connecting channel 6 connecting the sealed inner cavity 5 and the air cavity 4 is provided on the motor body 2; the air cavity 4 and the pump body 1 are integrally formed.

[0028] The motor body 2 comprises a motor housing 2.1, an upper end cover 2.2, and a lower end cover 2.3, and the communication channel 6 is located on the lower end cover 2.3.

[0029] A stator 7 and a rotor 8 are provided in the motor body 2, and a sealed inner cavity 5 is formed between the inner side of the stator 7, the outer side of the rotor 8, the bottom surface of the upper end cover 2.2, and the top surface of the lower end cover 2.3; a stator shielding cover 9 is provided on the inner side of the stator 7, and a shielding layer 11 is provided on the outer side of the rotor 8; a sealed inner cavity 5 is formed between the inner side of the stator shielding cover 9, the outer side of the shielding layer 11, the bottom surface of the upper end cover 2.2, and the top surface of the lower end cover 2.3; the upper end of the stator shielding cover 9 supports the upper end cover 2.2, and the lower end supports the lower end cover 2.3.

[0030] A cavity 14 is provided on the motor housing 2.1 and / or the upper end cover 2.2 and the lower end cover 2.3, and a cooling inlet and a cooling outlet are provided on the cavity 14.

[0031] The described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of 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.

Claims

1. A gas shielding pump, comprising a pump body and a motor body, wherein the pump body is provided with a liquid inlet channel, characterized in that: The pump body is also provided with an air cavity connected with the liquid inlet channel, the motor body is provided with a sealed inner cavity, and the motor body is provided with a communication channel connecting the sealed inner cavity and the air cavity.

2. The gas shielding pump according to claim 1, characterized in that: The air cavity and the pump body are of separate structures or integrally formed.

3. The gas shielding pump according to claim 1, characterized in that: The motor body comprises a motor housing, an upper end cover and a lower end cover, and the communication channel is located on the lower end cover.

4. The gas shielding pump according to claim 2, characterized in that: The motor body is provided with a stator and a rotor, and a sealed inner cavity is formed between the inner side of the stator, the outer side of the rotor, the bottom surface of the upper end cover, and the top surface of the lower end cover.

5. The gas shielding pump according to claim 4, characterized in that: A stator shield is provided inside the stator, and a rotor shield or shielding layer is provided outside the rotor; a sealed inner cavity is formed between the inside of the stator shield, the outside of the rotor shield or shielding layer, the bottom surface of the upper end cover, and the top surface of the lower end cover.

6. The gas shielding pump according to claim 5, characterized in that: The stator shielding cover is welded on the motor housing, a rotating shaft is arranged inside the rotor, and the rotor shielding cover is welded on the rotating shaft.

7. The gas shielding pump according to claim 5, characterized in that: The upper end of the stator shielding cover supports the upper end cover, and the lower end supports the lower end cover.

8. The gas shielding pump according to claim 1, characterized in that: The motor body is provided with an external circulation pipeline, and the inlet and outlet of the external circulation pipeline are both communicated with the sealed inner cavity.

9. The gas shielding pump according to claim 8, characterized in that: The inlet and outlet of the external circulation pipeline are respectively located on the upper end cover and the lower end cover.

10. The gas shielding pump according to claim 2 or 8, characterized in that: The motor housing and / or the upper end cover and the lower end cover are provided with a cavity, and the cavity is provided with a cooling inlet and a cooling outlet.

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