Pressure balance respirator

Abstract

A pressure balance respirator comprises a filter, a ventilation pipe (1) and a flange plate (2), the filter comprises a ventilation disc (3), a filter screen and a dustproof cap (4), the ventilation disc (3) is round, a center hole and a plurality of ventilation holes (5) surrounding the center hole are formed in the ventilation disc (3), external threads are arranged on the edge of the ventilation disc (3), and the ventilation disc (3) and the flange plate (2) are fixedly connected to the two ends of the ventilation pipe (1) respectively. The central holes of the two parts are respectively communicated with the ventilation pipe (1), the dustproof cap (4) is a cup-shaped body with an opening at one end, the dustproof cap (4) is in threaded connection with the ventilation disc (3), and the filter screen is arranged in the dustproof cap (4) and is pressed on the ventilation disc (3) through the dustproof cap (4). The device has the advantages of reasonable design, simple structure and convenience in use and maintenance.

Description

Technical Field

[0001] The utility model relates to a pressure balance breathing apparatus, in particular to a pressure balance breathing apparatus applicable to large high-voltage motors. Background Art

[0002] When a large high-voltage motor in mechanical equipment is operating, due to the operation of the rotor cooling fan inside the motor, a large negative pressure will be formed inside the high-voltage motor, resulting in oil leakage problems of the shaft bearing oil seals on both sides of the high-voltage motor due to excessive external negative pressure. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a pressure balance breathing apparatus applied to a large high-voltage motor to balance the internal and external pressures of the high-voltage motor, thereby solving the problem of oil leakage of the shaft bearing oil seals on both sides of the high-voltage motor due to excessive external negative pressure.

[0004] The technical solution of the utility model is: a pressure balance breathing apparatus, including a filter, a breathing tube and a flange. The filter includes a breathing disc, a filter net and a dust cap. The breathing disc is circular, and the breathing disc is provided with a central hole and a plurality of breathing holes arranged around the central hole. The edge of the breathing disc is provided with an external thread. The breathing disc and the flange are respectively fixed at both ends of the breathing tube, and their central holes are respectively communicated with the breathing tube. The dust cap is a cup-shaped body with an open end, and the dust cap is screwed with the breathing disc. The filter net is placed inside the dust cap and is pressed on the breathing disc through the dust cap.

[0005] The technical effect of the utility model is: it has the advantages of reasonable design, simple structure, convenient use and easy maintenance. By installing a pressure balance breathing apparatus by opening holes on the end plates on both sides of the motor and sealing and connecting through a flange, the transformation is simple and the use effect is remarkable. The inner and outer two-layer filter nets are used for filtering, and the filter nets adopt a stepped inlay structure, which is convenient for replacement and maintenance. The outer port of the breathing apparatus is arranged downward, which has a good dust-proof effect. Brief Description of the Drawings

[0006] Figure 1 It is a schematic cross-sectional structure diagram of the utility model. Detailed Description of the Invention

[0007] Such as Figure 1As shown in the figure, a pressure balance breathing apparatus includes a filter, a breathing tube 1, and a flange 2. The filter includes a breathing disk 3, a filter screen, and a dust cap 4. The breathing disk 3 is circular, and the breathing disk 3 is provided with a central hole and a plurality of breathing holes 5 arranged around the central hole. The edge of the breathing disk 3 is provided with an external thread. The breathing disk 3 and the flange 2 are respectively fixed at both ends of the breathing tube 1, and their central holes are respectively communicated with the breathing tube 1. The dust cap 4 is a cup-shaped body with one end open, and the dust cap 4 is screwed to the breathing disk 3. The filter screen is placed inside the dust cap 4 and is pressed against the breathing disk 3 by the dust cap 4.

[0008] The filter screen includes a primary filter screen 6 and a secondary filter screen 7. The primary filter screen 6 is annular. An annular step 8 for placing the primary filter screen 6 is provided at the inner side end of the breathing disk 3 located inside the dust cap. The primary filter screen 6 is placed at the annular step 8. The secondary filter screen 7 is arranged outside the primary filter screen 6. The breathing holes 5 are provided at the annular step 8 so that the primary filter screen can cover the breathing holes. Since the filter screen will be embedded in the dust cap after being pressed, it is not convenient to take out and replace. Adding a primary filter screen at the step can not only further prevent dust, but also facilitate taking out and replacing, and also extend the service life of the internal filter screen. The end face of the primary filter screen should be flush with or slightly lower than the end face of the breathing disk so that the secondary filter screen can effectively filter. The secondary filter screen is cylindrical.

[0009] The thickness of the primary filter screen 6 is less than that of the secondary filter screen 7.

[0010] The density of the primary filter screen 6 is greater than that of the secondary filter screen 7.

[0011] The breathing tube 1 is a 90-degree elbow. The flange is connected to both ends of the motor. The elbow bends upward so that the breathing holes face downward, which can achieve a good dust-proof effect.

[0012] The breathing disk 3 and the flange 2 are respectively welded to the breathing tube 1.

[0013] Pressure balance breathing apparatuses are respectively installed on the upper halves of the end plates at both ends of the high-voltage motor body. When the motor is running, the internal rotor cooling fan of the high-voltage motor rotates to cause negative pressure inside the body. At this time, external gas can enter through the pressure balance breathing apparatus to balance the negative pressure inside the high-voltage motor body, thus solving the problem of oil leakage of the shaft sleeve oil seals on both sides inside the high-voltage motor body due to excessive external negative pressure.

Claims

1. A pressure-balanced respirator, characterized in that: The invention comprises a filter, a vent pipe (1) and a flange (2), wherein the filter comprises a vent plate (3), a filter screen and a dust cap (4), wherein the vent plate (3) is circular and is provided with a central hole and a plurality of vent holes (5) arranged around the central hole, and an outer thread is arranged on the edge of the vent plate (3), the vent plate (3) and the flange (2) are respectively fixedly connected to the two ends of the vent pipe (1), and the central holes of the two are respectively connected to the vent pipe (1), and the dust cap (4) is a cup-shaped body with an open end, the dust cap (4) is screwed to the vent plate (3), and the filter screen is placed in the dust cap (4) and is pressed against the vent plate (3) through the dust cap (4).

2. The pressure-balanced respirator of claim 1, wherein: The filter screen comprises a primary filter screen (6) and a secondary filter screen (7); the primary filter screen (6) is annular; an annular step (8) for placing the primary filter screen (6) is provided at the inner end of the air permeable plate (3); the primary filter screen (6) is placed on the annular step (8); the secondary filter screen (7) is arranged outside the primary filter screen (6); and the air permeable hole (5) is arranged on the annular step (8).

3. The pressure-balanced respirator of claim 2, wherein: The thickness of the primary filter screen (6) is smaller than that of the secondary filter screen (7).

4. A pressure-balanced respirator as claimed in claim 2 or 3, characterized in that: The primary filter screen (6) has a greater density than the secondary filter screen (7).

5. The pressure-balanced respirator of claim 1, wherein: The vent pipe (1) is a 90-degree curved pipe.

6. The pressure-balanced respirator of claim 1, wherein: The vent plate (3) and the flange plate (2) are respectively welded to the vent pipe (1).

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