Breathing device for shield motor and shield pump

Abstract

The utility model relates to a breathing device for a shield motor and a shield pump. The breathing device comprises a first welding block and a second welding block, the upper end of the first welding block is sleeved with a second welding block. The bottom of the first welding block is welded on the motor shell; a vertical through hole is formed in the middle of the first welding block; the through hole penetrates through the upper and lower ends of the first welding block; the through hole corresponds to an inner hole in the upper end of the shield motor shell in position; a groove with a downward opening is formed in the contact end of the second welding block and the first welding block; a porous sintering element is arranged in the groove; a waterproof breathable film is arranged on the surface, close to the first welding block, of the porous sintering element; a plurality of elastic check rings are arranged between the waterproof breathable film and the first welding block. According to the utility model, reliable air permeability and pressure balance of the stator cavity of the shielding motor can be ensured, liquid is effectively blocked, and the service life of the shielding motor is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of shielded pumps, in particular to a breathing device for shielded motors and a shielded pump. Background Art

[0002] As a part of shielded electric pumps, shielded motors are widely used in flammable and explosive hazardous places. By monitoring the stator cavity of shielded motors, faults of shielded motors can be discovered in time. While protecting shielded motors, the surrounding environment can also be protected in time to eliminate safety hazards.

[0003] In the past, the breathing device of the shielded motor used a porous sintered element 6 connected to the motor housing through AB glue and the first welding block 1. The advantages of this structure are simple process and convenient assembly. However, when the second welding block 2 and the first welding block 1 are separated, the adhesive joint surface of the porous sintered element 6 and the welding block 1 has the hidden danger of failure, which leads to the shielded motor stator cavity leaking after the shielding sleeve, and the toxic and harmful medium is transmitted to the outside of the motor housing through the stator cavity, affecting the safety of the surrounding environment. Therefore, a new shielded motor breathing device structure that can solve the above problems is now needed. Utility Model Content

[0004] The utility model mainly solves the technical problems of leakage in the breathing device of the prior art, which affects environmental safety, and proposes a breathing device and a canned motor for canned motors, which can ensure that the stator cavity of the canned motor achieves reliable air permeability and pressure balance, while effectively blocking liquids and effectively extending the service life of the canned motor.

[0005] The utility model provides a breathing device, comprising: a first welding block and a second welding block; the second welding block is sleeved on the upper end of the first welding block; the bottom of the first welding block is welded on the motor housing;

[0006] A vertical through hole is provided in the middle of the first welding block; the through hole passes through the upper and lower ends of the first welding block; an external thread is provided on the outer side wall of the upper end of the first welding block;

[0007] A first groove opening downward is provided at the lower end of the second welding block; an internal thread is provided on the inner side wall of the groove; the first groove is sleeved on the upper end of the first welding block; the external thread of the first welding block cooperates with the internal thread of the second welding block; a porous sintered element is provided at the top of the first groove; a waterproof and breathable membrane is provided on the surface of the porous sintered element close to the first welding block; a plurality of elastic retaining rings are provided between the waterproof and breathable membrane and the first welding block; a second groove opening upward is provided at the upper end of the second welding block; the first groove is connected to the second groove.

[0008] Furthermore, a back-off groove is provided at the top of the second welding block in contact with the first welding block.

[0009] Furthermore, a step is provided in the circumferential direction at an upper middle portion of an outer wall of the first welding block; and a lower end surface of the first groove of the second welding block contacts an upper end surface of the step.

[0010] Furthermore, a plurality of accommodating grooves with openings facing downward are arranged along the circumferential direction on the lower end surface of the first groove; and sealing rings are placed in the accommodating grooves.

[0011] Furthermore, the size of the accommodating groove is adapted to the size of the sealing ring.

[0012] Furthermore, the sealing ring is an O-ring.

[0013] Furthermore, the porous sintered element is bonded to the top of the first groove by AB glue.

[0014] Furthermore, a monitoring instrument may be installed on the upper end surface of the second welding block.

[0015] Furthermore, a shielded pump comprises a breathing device for a shielded motor as described in any one of the above items, wherein the breathing device for the shielded motor is welded to the upper part of the shielded motor housing; the through hole of the first welding block of the breathing device for the shielded motor corresponds to the position of the inner hole of the upper end of the shielded motor housing.

[0016] Compared with the prior art, the breathing device and the shielded pump for the shielded motor provided by the utility model have a simple structure and a reasonable design. The utility model is a breathing device structure with mechanical fixation and a waterproof breathable membrane. A plurality of elastic retaining rings 4 ensure that the adhesive joint surface between the porous sintered element 6 and the second welding block 2 is stable and reliable. At the same time, the micropores of the waterproof breathable membrane 5 can prevent water, dirt and debris from entering the stator cavity of the shielded motor, making the shielded motor equipment safer and more durable. The manufacturing process of the breathing device with this structure is simple, suitable for promotion and application in this field, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the breathing device for the shielded motor proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the first welding block of the breathing device for the shielded motor proposed by the utility model;

[0019] Figure 3 It is a structural schematic diagram of a specific implementation of the utility model;

[0020] Figure numerals: 1. first welding block; 2. second welding block; 3. sealing ring; 4. elastic retaining ring; 5. waterproof breathable membrane; 6. porous sintered element; 7. back cutter groove; 8. step; 9. external thread; 10. shielded motor housing; 11. front shielding plate; 12. front cover of motor housing; 13. rear shielding plate; 14. rear cover of motor housing; 15. stator shielding sleeve; 16. rotor cavity; 17. stator cavity. DETAILED DESCRIPTION

[0021] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the sake of ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of the contents.

[0022] Example 1

[0023] like Figure 1 As shown, a breathing device provided by an embodiment of the utility model comprises: a first welding block 1 and a second welding block 2; the second welding block 2 is sleeved on the upper end of the first welding block 1; the bottom of the first welding block 1 is welded on the motor housing;

[0024] A vertical through hole is provided in the middle of the first welding block 1; the through hole passes through the upper and lower ends of the first welding block 1; the through hole can correspond to the position where the first groove and the second groove in the middle of the second welding block 2 are connected, and the lower end of the through hole corresponds to the position of the inner hole at the upper end of the shielded motor housing; an external thread 9 is provided on the outer side wall of the upper end of the first welding block 1;

[0025] The lower end of the second welding block 2 is provided with a first groove opening downward; the inner side wall of the first groove is provided with an internal thread; the first groove is sleeved on the upper end of the first welding block 1; the external thread 9 of the first welding block 1 cooperates with the internal thread of the second welding block 2; a porous sintered element 6 is provided at the top of the first groove; the porous sintered element 6 is bonded to the top of the first groove by AB glue. A waterproof breathable membrane 5 is provided on the surface of the porous sintered element 6 close to the first welding block 1; a plurality of elastic retaining rings 4 are provided between the waterproof breathable membrane 5 and the first welding block 1; a second groove opening upward is provided at the upper end of the second welding block 2; the first groove is connected to the second groove; the diameter of the connection between the first groove and the second groove is smaller than the diameter of the opening at the lower end of the first groove and the upper end of the second groove. A monitoring instrument can be installed on the upper end surface of the second welding block 2. The second groove is provided with an internal thread, which can cooperate with the external thread of the monitoring instrument.

[0026] The second welding block 2 is provided with a backing groove at the top in contact with the first welding block 1. The lower end surface of the first groove is provided with a plurality of accommodating grooves with openings downward along the circumferential direction; a sealing ring is placed in the accommodating groove. The size of the accommodating groove is adapted to the size of the sealing ring 3. The sealing ring 3 is an O-ring. A step 8 is provided at the upper middle position of the outer wall of the first welding block 1 along the circumferential direction; the lower end surface of the first groove of the second welding block 2 is in contact with the upper end surface of the step 8.

[0027] The working principle of the utility model is that the breathing device of the utility model includes a first welding block 1, a second welding block 2, a sealing ring 3, an elastic retaining ring 4, a waterproof breathable membrane 5, and a porous sintered element 6. After these six parts together form a breathing device assembly for a shielded motor, they can be welded on the surface of a shielded motor housing drilled with an inner hole. Among them, after the through hole of the first welding block 1 is aligned with the inner hole of the shielded motor housing, the stator cavity of the shielded motor is connected to the outside of the motor housing through the waterproof breathable membrane 5 and the porous sintered element 6. The microporous structure of the waterproof breathable membrane 5 allows gas to pass freely while preventing the invasion of rainwater, oil and particles. The elastic retaining ring 4 installed in the first groove of the second welding block 2 can not affect the connection between the porous sintered element 6 and the second welding block 2 when the first welding block 1 and the second welding block 2 are rotated and threaded apart, ensuring that the adhesive joint surface between the porous sintered element 6 and the second welding block 2 does not fail. The breathing device has a simple structure and can operate safely and reliably in an explosive environment.

[0028] Through the second welding block 2 connected with the external thread of the first welding block 1, after the first welding block 1 and the second welding block 2 are screwed, the contact surface of the first welding block 1 and the second welding block 2 is sealed by the sealing ring 3, and the porous sintered element 6 is bonded to the inner surface of the first groove of the second welding block 2 by AB glue. At the same time, the elastic retaining ring 4 installed in the first groove of the second welding block 2 can play a mechanical fixing role for the porous sintered element 6, and the waterproof breathable membrane 5 (with backing glue) is glued to the surface of the porous sintered element 6. The multiple elastic retaining rings 4 arranged inside the breathing device can be used as mechanical fixing parts, which provides convenient conditions for the inspection and maintenance of the shielded motor stator cavity monitoring equipment. When the first welding block 1 and the second welding block 2 are separated by threads, the elastic retaining ring 4 can effectively fix the porous sintered element 6 to ensure that the adhesive joint surface of the porous sintered element 6 and the second welding block 2 does not fail. In addition, the waterproof breathable membrane 5 glued to the surface of the porous sintered element 6 can also ensure that the shielded motor stator cavity achieves reliable air permeability and pressure balance, while effectively blocking liquids and effectively extending the service life of the shielded motor.

[0029] Example 2

[0030] like Figure 2 As shown, a shielded pump comprises a breathing device for a shielded motor as described in any one of the above items, wherein the breathing device for the shielded motor is welded to the upper part of the shielded motor housing 10; the through hole of the first welding block 1 of the breathing device for the shielded motor corresponds to the inner hole position of the upper end of the shielded motor housing 10.

[0031] The first welding block 1 is welded on the shielded motor housing 10 with an inner hole, the front shielding plate 11 is clamped at the front end of the motor housing front cover 12, and the rear shielding plate 13 is clamped at the end of the motor housing rear cover 14. In this way, the closed area formed by welding the front shielding plate 11 and the stator shielding sleeve 15, and the rear shielding plate 13 and the stator shielding sleeve can isolate the medium in the rotor cavity 16 from entering the stator cavity 17, thereby protecting the shielded motor. The first welding block 1 is welded on the shielded motor housing with an inner hole. When the through hole of the first welding block 1 is aligned with the inner hole of the shielded motor housing, the shielded motor stator cavity is connected to the outside of the motor housing through the waterproof breathable membrane 5 and the porous sintered element 6. The elastic retaining ring 4 installed in the groove of the second welding block 2 can fix the porous sintered element 6, and the waterproof breathable membrane 5 can balance the air pressure and isolate the liquid.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that modifying the technical solutions recorded in the aforementioned embodiments, or replacing part or all of the technical features therein by equivalents, does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A breathing device for shielded motors, It is characterized in that include: A first welding block (1) and a second welding block (2); the second welding block (2) is sleeved on the upper end of the first welding block (1); A vertical through hole is provided in the middle of the first welding block (1); the through hole passes through the upper and lower ends of the first welding block (1); an external thread (9) is provided on the outer side wall of the upper end of the first welding block (1); A first groove opening downward is provided at the lower end of the second welding block (2); an internal thread is provided on the inner side wall of the first groove; the first groove is sleeved on the upper end of the first welding block (1); the external thread (9) of the first welding block (1) cooperates with the internal thread of the second welding block (2); a porous sintered element (6) is provided at the top of the first groove; a waterproof breathable membrane (5) is provided on the surface of the porous sintered element (6) close to the first welding block (1); a plurality of elastic retaining rings (4) are provided between the waterproof breathable membrane (5) and the first welding block (1); a second groove opening upward is provided at the upper end of the second welding block (2); and the first groove is connected to the second groove.

2. The breathing device for a shielded motor according to claim 1, It is characterized in that A back-off groove is provided at the top of the second welding block (2) where it contacts the first welding block (1).

3. The breathing device for a shielded motor according to claim 2, It is characterized in that A step (8) is provided in the circumferential direction at an upper position in the middle of the outer wall of the first welding block (1); and the lower end surface of the first groove of the second welding block (2) is in contact with the upper end surface of the step (8).

4. The breathing device for a shielded motor according to claim 3, It is characterized in that A plurality of accommodating grooves with openings facing downward are arranged along the circumferential direction on the lower end surface of the first groove; a sealing ring (3) is placed in the accommodating groove.

5. The breathing device for a shielded motor according to claim 4, It is characterized in that The size of the accommodating groove is adapted to the size of the sealing ring (3).

6. The breathing device for a shielded motor according to claim 4, It is characterized in that The sealing ring (3) is an O-ring.

7. The breathing device for a shielded motor according to claim 1, It is characterized in that The porous sintered element (6) is bonded to the top of the first groove by using AB glue.

8. The breathing device for a shielded motor according to claim 1, It is characterized in that A monitoring instrument may be installed on the upper end surface of the second welding block (2).

9. A canned motor pump, It is characterized in that A breathing device for a shielded motor comprising any one of claims 1 to 8; The breathing device for the shielded motor is welded to the upper part of the shielded motor housing; the through hole of the first welding block (1) of the breathing device for the shielded motor corresponds to the position of the inner hole at the upper end of the shielded motor housing.

Images