Mechanical sealing device of high-pressure boiler feed pump

Abstract

The mechanical sealing device comprises a pump body and a motor, a penetrating hole is formed in the side, close to the driving motor, of the pump body, a sealing cylinder is fixedly connected to the side, close to the penetrating hole, of the outer side wall of the pump body, and the output end of the motor is fixedly connected with a driving shaft penetrating through the sealing cylinder and the penetrating hole. A static ring is arranged on the side, away from the pump body, of the inner side wall of the sealing cylinder, an opening is formed in the end, away from the pump body, of the sealing cylinder, and a connecting ring matched with the opening is fixedly connected to the side, close to the opening, of the outer side wall of the driving shaft. Through cooperation of the pump body, the motor, the penetrating hole, the sealing cylinder, the driving shaft, the static ring, the opening, the connecting ring, the spring, the moving ring and the heat dissipation assembly, the temperature of the moving ring, the static ring and the spring is reduced when the pump body is used, and the situation that the service life of the moving ring, the static ring and the spring is affected by high temperature and the overall service life of the mechanical sealing device is affected is further avoided as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, concretely is a kind of mechanical seal device of high-pressure boiler feed water pump. BACKGROUND

[0002] In high-pressure boiler feed water system, feed water pump is one of key equipment, its working principle is to rely on the dynamic ring fixed on the shaft and the static ring fixed on the pump shell, and utilize the elastic force of elastic element and the pressure of sealing liquid to promote the close contact of dynamic ring and static ring, realize sealing function, and its performance directly influences the operating efficiency and safety of boiler.

[0003] The existing high-pressure boiler feed water pump mechanical seal device is used, and since the fluid in the pump body is high in temperature during sealing process of dynamic ring and static ring, the service life of spring used to push dynamic ring will be affected under high temperature, dynamic ring and static ring can also be rubbed mutually by volume increasing under high temperature, and then the service life of mechanical seal device as a whole is affected. UTILITY MODEL CONTENTS

[0004] To solve the defects that the service life of spring used to push dynamic ring will be affected under high temperature, dynamic ring and static ring can also be rubbed mutually by volume increasing under high temperature, and then the service life of mechanical seal device as a whole is affected in prior art, the utility model provides a kind of mechanical seal device of high-pressure boiler feed water pump.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model discloses a kind of mechanical seal device of high-pressure boiler feed water pump, including pump body and motor, the side of pump body close to driven motor is provided with perforation, the side of the outer lateral wall of pump body close to perforation is fixedly connected with sealing cylinder, the output end of motor is fixedly connected with driving shaft passing through sealing cylinder and perforation;

[0007] The side of the inner lateral wall of sealing cylinder away from pump body is provided with static ring, the end of sealing cylinder away from pump body is provided with opening, the side of the outer lateral wall of driving shaft close to opening is fixedly connected with the connecting ring compatible with opening, the side of the outer lateral wall of connecting ring close to static ring is fixedly connected with spring, the end of spring away from connecting ring is fixedly connected with dynamic ring, sealing cylinder is internally provided with heat dissipation assembly for heat dissipation of gas in sealing cylinder.

[0008] As a preferred technical scheme of the utility model, the heat dissipation assembly includes heat dissipation cylinder that is annularly distributed in sealing cylinder, and both ends of the heat dissipation cylinder pass through sealing cylinder, the inner lateral wall of the heat dissipation cylinder is fixedly connected with connecting rod, the end of the connecting rod away from heat dissipation cylinder is rotatably connected with rotating shaft, and both sides of the outer lateral wall of rotating shaft are provided with ventilation fan blade.

[0009] The outer side wall of the connecting ring is fixedly connected with a first helical gear at one end away from the spring, and the end of the rotating shaft close to the first helical gear is fixedly connected with a second helical gear engaged with the first helical gear.

[0010] As a preferred technical scheme of the utility model, the outer side wall of the static ring and the dynamic ring is fixedly connected with annularly distributed first radiating fins.

[0011] As a preferred technical scheme of the utility model, the outer side wall of the radiating cylinder is provided with second radiating fins on one side close to the driving shaft.

[0012] As a preferred technical scheme of the utility model, the inner side wall of the radiating cylinder is provided with filter screens at both ends.

[0013] As a preferred technical scheme of the utility model, one side of the inner side wall of the sealing cylinder is provided with a limiting cylinder matched with the static ring, and the end of the limiting cylinder close to the static ring is provided with a limiting groove matched with the first radiating fin fixedly connected to the outer side wall of the static ring.

[0014] As a preferred technical scheme of the utility model, the outer side wall of the static ring is provided with a first auxiliary sealing ring on one side close to the pump body, and the inner side wall of the dynamic ring is provided with a second auxiliary sealing ring on one side.

[0015] The utility model discloses beneficial effects are:

[0016] 1. The mechanical sealing device of high pressure boiler feed pump, through the cooperation of pump body, motor, perforation, sealing cylinder, driving shaft, static ring, opening, connecting ring, spring, dynamic ring and radiating assembly, the air in the sealing cylinder and the outside air are heat exchanged when the radiating assembly is driven by the motor and pumps the fluid, simultaneously, the spring, the dynamic ring and the static ring all are heat exchanged with the air in the sealing cylinder, and then the spring, the dynamic ring and the static ring are indirectly heat exchanged, reduce the temperature of the dynamic ring, the static ring and the spring when using the pump body, further avoid the service life of the dynamic ring, the static ring and the spring influenced by high temperature and affect the service life of the mechanical sealing device whole,

[0017] 2. The mechanical sealing device of high pressure boiler feed pump, through the setting of first radiating fin and second radiating fin, the first radiating fin can improve the heat exchange efficiency of the static ring and the dynamic ring and the air in the sealing cylinder as far as possible, the second radiating fin can improve the heat exchange efficiency of the radiating cylinder and the air in the sealing cylinder as far as possible, and then improve the radiating effect of the device whole to the dynamic ring and the static ring,

[0018] 3. The mechanical sealing device of the high-pressure boiler feed water pump, through the setting of the filter screen, the filter screen can filter dust in the air, avoiding excessive dust accumulation in the heat dissipation cylinder to affect the heat exchange effect of the air flowing through the heat dissipation cylinder and the air inside the sealing cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the principles of the present application, and do not constitute a limitation of the present application. In the drawings:

[0020] Figure 1 is a side view structural schematic diagram of the mechanical sealing device of the high-pressure boiler feed water pump of the present application;

[0021] Figure 2 is a sealing cylinder side view cross-sectional structural schematic diagram of the mechanical sealing device of the high-pressure boiler feed water pump of the present application;

[0022] Figure 3 is a sealing cylinder side view cross-sectional structural schematic diagram of the mechanical sealing device of the high-pressure boiler feed water pump of the present application; Figure 2 is an enlarged schematic diagram of the structure at A in the mechanical sealing device of the high-pressure boiler feed water pump of the present application;

[0023] Figure 4 is a sealing cylinder main view cross-sectional structural schematic diagram of the mechanical sealing device of the high-pressure boiler feed water pump of the present application.

[0024] In the drawings: 1, pump body; 2, motor; 3, perforation; 4, sealing cylinder; 5, driving shaft; 6, static ring; 7, opening; 8, connecting ring; 9, spring; 10, dynamic ring; 11, heat dissipation assembly; 111, heat dissipation cylinder; 112, connecting rod; 113, rotating shaft; 114, ventilation fan blade; 115, first helical gear; 116, second helical gear; 12, first heat dissipation fin; 13, second heat dissipation fin; 14, filter screen; 15, limiting cylinder; 16, limiting groove; 17, first auxiliary sealing ring; 18, second auxiliary sealing ring. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not constitute a limitation of the present application.

[0026] Reference Figure 1 , Figure 2 and Figure 3The utility model discloses a high pressure boiler feed water pump's mechanical seal device, including pump body 1 and motor 2, motor 2 electric connection is in control panel (not shown in drawing), the one side of pump body 1 close to drive motor 2 is provided with perforation 3, and the one side of pump body 1 outer side wall close to perforation 3 is fixedly connected with sealing cylinder 4, and the output of motor 2 is fixedly connected with drive shaft 5 that penetrates sealing cylinder 4 and perforation 3.

[0027] Referring to Figure 2 、 Figure 3 and Figure 4 , the inner side wall of sealing cylinder 4 is provided with a static ring 6 away from the pump body 1, and the inner side wall of the sealing cylinder 4 is provided with a limiting cylinder 15 adapted to the static ring 6, the limiting cylinder 15 is provided with a limiting groove 16 adapted to the first heat sink 12 fixedly connected to the outer side wall of the static ring 6, and the outer side wall of the static ring 6 is provided with a first auxiliary sealing ring 17 close to the pump body 1, and the first auxiliary sealing ring 17 can seal between the static ring 6 and the limiting cylinder 15.

[0028] The end of the sealing cylinder 4 away from the pump body 1 is provided with an opening 7, the outer side wall of the drive shaft 5 is fixedly connected with a connecting ring 8 adapted to the opening 7 close to the opening 7, the outer side wall of the connecting ring 8 is fixedly connected with a spring 9 close to the static ring 6, the end of the spring 9 away from the connecting ring 8 is fixedly connected with a dynamic ring 10, the inner side wall of the dynamic ring 10 is provided with a second auxiliary sealing ring 18, and the dynamic ring 10 is attached to the static ring 6 under the action of the spring 9, when the motor 2 starts, the drive shaft 5 rotates, and the water flow is pumped through the pump body 1, in this process, the connecting ring 8, the spring 9 and the dynamic ring 10 rotate with the drive shaft 5, the spring 9 pushes the dynamic ring 10 away from the connecting ring 8, so that the dynamic ring 10 and the static ring 6 are effectively contacted and sealed, and the second auxiliary sealing ring 18 seals between the dynamic ring 10 and the drive shaft 5, thereby ensuring the sealing effect of the device as a whole on the connecting part of the pump body 1 and the drive shaft 5.

[0029] Referring to Figure 2 、 Figure 3 and Figure 4 , the sealing cylinder 4 is provided with a heat dissipation assembly 11 for dissipating heat from the inside of the sealing cylinder 4, the heat dissipation assembly 11 comprises a heat dissipation cylinder 111 arranged in a ring shape inside the sealing cylinder 4, and the two ends of the heat dissipation cylinder 111 penetrate the sealing cylinder 4, the inner side wall of the heat dissipation cylinder 111 is fixedly connected with a connecting rod 112, the end of the connecting rod 112 away from the heat dissipation cylinder 111 is rotatably connected with a rotating shaft 113, the outer side wall of the rotating shaft 113 is provided with a ventilation fan blade 114 on both sides, the inner side wall of the heat dissipation cylinder 111 is provided with a filter screen 14 at both ends, the outer side wall of the connecting ring 8 is fixedly connected with a first bevel gear 115 away from the spring 9, and the end of the rotating shaft 113 close to the first bevel gear 115 is fixedly connected with a second bevel gear 116 engaged with the first bevel gear 115.

[0030] When the motor 2 drives the driving shaft 5 to rotate, the first bevel gear 115 rotates with the connecting ring 8, thereby driving the second bevel gear 116, the rotating shaft 113 and the ventilation fan blade 114 to rotate, when the ventilation fan blade 114 rotates, the air flow speed in the heat dissipation cylinder 111 is accelerated, the heat generated by the static ring 6 and the dynamic ring 10 in the use process is first exchanged with the air inside the sealing cylinder 4, and the air inside the sealing cylinder 4 and the air flowing through the heat dissipation cylinder 111 are further exchanged through the cylinder wall of the heat dissipation cylinder 111, thereby indirectly cooling the static ring 6 and the dynamic ring 10, at the same time, the filter screen 14 can filter the dust in the air, avoiding that excessive dust is accumulated in the heat dissipation cylinder 111 to affect the heat exchange effect of the air flowing through the heat dissipation cylinder 111 and the air inside the sealing cylinder 4.

[0031] With reference to Figure 2 And Figure 4 The outer side wall of the static ring 6 and the dynamic ring 10 is fixedly connected with the first heat dissipation fin 12 distributed in a ring shape, through the setting of the first heat dissipation fin 12, the heat exchange efficiency of the static ring 6 and the dynamic ring 10 and the air inside the sealing cylinder 4 can be improved as much as possible, the outer side wall of the heat dissipation cylinder 111 is provided with the second heat dissipation fin 13 near the driving shaft 5, through the setting of the second heat dissipation fin 13, the heat exchange efficiency of the heat dissipation cylinder 111 and the air inside the sealing cylinder 4 can be improved as much as possible.

[0032] The working principle of the utility model is:

[0033] When working, the dynamic ring 10 is attached to the static ring 6 under the action of the spring 9, when the motor 2 starts, the driving shaft 5 rotates, the water flow is pumped through the pump body 1, in this process, the connecting ring 8, the spring 9 and the dynamic ring 10 rotate with the driving shaft 5, the spring 9 pushes the dynamic ring 10 to the side away from the connecting ring 8, so that the dynamic ring 10 and the static ring 6 are effectively contacted to seal, at the same time, the second auxiliary sealing ring 18 seals between the dynamic ring 10 and the driving shaft 5, the first auxiliary sealing ring 17 can seal between the static ring 6 and the limiting cylinder 15, thereby ensuring the sealing effect of the device as a whole on the connecting place of the pump body 1 and the driving shaft 5.

[0034] When the motor 2 drives the driving shaft 5 to rotate, the first bevel gear 115 rotates with the connecting ring 8, thereby driving the second bevel gear 116, the rotating shaft 113 and the ventilation fan blade 114 to rotate, when the ventilation fan blade 114 rotates, the air flow speed in the heat dissipation cylinder 111 is accelerated, the heat generated by the static ring 6 and the dynamic ring 10 in the use process is first exchanged with the air inside the sealing cylinder 4, and the air inside the sealing cylinder 4 and the air flowing through the heat dissipation cylinder 111 are further exchanged through the cylinder wall of the heat dissipation cylinder 111, thereby indirectly cooling the static ring 6 and the dynamic ring 10, at the same time, the filter screen 14 can filter the dust in the air, avoiding that excessive dust is accumulated in the heat dissipation cylinder 111 to affect the heat exchange effect of the air flowing through the heat dissipation cylinder 111 and the air inside the sealing cylinder 4.

[0035] The first heat dissipation fin 12 can improve the heat exchange efficiency between the static ring 6, the dynamic ring 10 and the air inside the sealing cylinder 4 as much as possible, and the second heat dissipation fin 13 can improve the heat exchange efficiency between the heat dissipation cylinder 111 and the air inside the sealing cylinder 4 as much as possible.

[0036] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A mechanical seal device of a high-pressure boiler feed water pump comprising a pump body (1) and a motor (2), characterized in that, The pump body (1) is provided with a through hole (3) near one side of the driving motor (2), the outer side wall of the pump body (1) is fixedly connected with a sealing cylinder (4) near one side of the through hole (3), and the output end of the motor (2) is fixedly connected with a driving shaft (5) penetrating through the sealing cylinder (4) and the through hole (3). The inner side wall of the sealing cylinder (4) is provided with a static ring (6) away from the pump body (1), the sealing cylinder (4) is provided with an opening (7) away from the pump body (1), the outer side wall of the driving shaft (5) is fixedly connected with a connecting ring (8) matched with the opening (7) near the opening (7), the outer side wall of the connecting ring (8) is fixedly connected with a spring (9) near the static ring (6), one end of the spring (9) away from the connecting ring (8) is fixedly connected with a dynamic ring (10), and the sealing cylinder (4) is provided with a heat dissipation assembly (11) for dissipating heat of gas in the sealing cylinder (4).

2. A mechanical seal device for a high-pressure boiler feed water pump according to claim 1, characterized in that, The heat dissipation assembly (11) comprises heat dissipation cylinders (111) arranged in the sealing cylinder (4) in an annular manner, both ends of the heat dissipation cylinders (111) penetrate through the sealing cylinder (4), and the inner side wall of the heat dissipation cylinders (111) is fixedly connected with connecting rods (112). The outer side wall of the connecting ring (8) is fixedly connected with a first helical gear (115) away from the spring (9), and the end of the rotating shaft (113) near the first helical gear (115) is fixedly connected with a second helical gear (116) engaged with the first helical gear (115).

3. A mechanical seal device for a high-pressure boiler feed water pump according to claim 2, characterized in that, The outer side wall of the static ring (6) and the dynamic ring (10) is fixedly connected with first heat dissipation fins (12) arranged in an annular manner around the outer side wall.

4. A mechanical seal device for a high-pressure boiler feed water pump according to claim 3, characterized in that, The outer side wall of the heat dissipation cylinders (111) is provided with second heat dissipation fins (13) near the driving shaft (5).

5. A mechanical seal device for a high-pressure boiler feed water pump according to claim 4, characterized in that, The inner side wall of the heat dissipation cylinders (111) is provided with filter screens (14) at both ends.

6. A mechanical seal device for a high-pressure boiler feed water pump according to claim 5, characterized in that, The inner side wall of the sealing cylinder (4) is provided with a limiting cylinder (15) matched with the static ring (6) on one side, and the end of the limiting cylinder (15) near the static ring (6) is provided with a limiting groove (16) matched with the first heat dissipation fins (12) fixedly connected to the outer side wall of the static ring (6).

7. A mechanical seal device for a high-pressure boiler feed water pump according to claim 6, characterized in that The outer side wall of the static ring (6) is provided with a first auxiliary sealing ring (17) near the pump body (1), and the inner side wall of the dynamic ring (10) is provided with a second auxiliary sealing ring (18).

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