Rotary sealing device for electrode boiler

Abstract

The utility model discloses a rotary sealing device for an electrode boiler, which relates to the technical field of electrode boilers and comprises a rotating shaft and a boiler shell, two tapered roller bearings are mounted on the rotating shaft, the rotating shaft is in transition fit with inner rings of the tapered roller bearings, a bearing positioning sleeve is sleeved outside the rotating shaft, and the bearing positioning sleeve is sleeved outside the boiler shell. The rotating shaft is in clearance fit with the bearing positioning sleeve, the two tapered roller bearings are installed at the two ends of the bearing positioning sleeve respectively, and a flange sealing seat is installed on the lower tapered roller bearing. When the hot water boiler is full of water, liquid films can be formed on the friction surfaces of the movable ring and the static ring, the sealing performance in the rotating or static state is guaranteed, and when the hot water boiler is not full of water, the liquid films on the friction surfaces of the movable ring and the static ring can be formed by external washing circulating water. The mechanical seal can bear high pressure, the pressure of external washing circulating water can counteract part of the internal pressure of the boiler, and the washing circulating water can also play a role in cooling.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrode boiler, especially relates to a rotary sealing device for electrode boiler. BACKGROUND

[0002] The working principle of the electrode boiler is that the electrode is immersed in water with certain conductivity, and after electrification, the electric current is generated between the electrode and the zero electrode cylinder due to the high resistance of water, and the water is heated to high-temperature water. The power adjustment mode is that the rotating lead screw is used to lift the electrode protection shield, the electrode protection shield is an insulator to isolate the electrode and the zero electrode cylinder from discharging, so as to adjust the electric power, and the adjustment range is 0-100%.

[0003] In the prior art, the rotating lead screw and the electrode protection shield are installed in the boiler, the electric actuator or the servo motor is the power source and is installed outside the boiler, the rotating lead screw is connected to a shaft outside the boiler, the shaft is connected to the electric actuator or the servo motor through a shaft coupling, and the shaft is sealed with the boiler through packing. In actual application, it is found that the pressure in the boiler cannot be maintained, and leakage often occurs. If the packing is too tight, the electric actuator or the servo motor will report an overload fault, which affects the safe operation of the electrode boiler. UTILITY MODEL CONTENTS

[0004] The purpose of the present application is to provide a rotary sealing device for an electrode boiler to solve the problem of maintaining the pressure in the boiler, frequent leakage, and the electric actuator or the servo motor reporting an overload fault if the packing is too tight, which affects the safe operation of the electrode boiler.

[0005] To achieve the above object, the application provides the following technical scheme: a rotary sealing device for electrode boiler, comprising a rotating shaft and a boiler shell, two tapered roller bearings are installed on the rotating shaft, and the rotating shaft is transitionally matched with the inner ring of the tapered roller bearings, a bearing positioning sleeve is sleeved on the outside of the rotating shaft, and the rotating shaft is gap matched with the bearing positioning sleeve, the two tapered roller bearings are respectively installed at the two ends of the bearing positioning sleeve, a flange sealing seat is installed on the lower tapered roller bearing, a bearing end cover is installed on the other tapered roller bearing, a second screw is installed on the bearing end cover, the second screw is used for fixing the flange sealing seat and the bearing end cover, a static ring mounting plate is sleeved on the outside of the rotating shaft, a first screw is installed on the static ring mounting plate, the first screw is used for fixing the static ring mounting plate and the flange sealing seat, a static ring is installed on the static ring mounting plate, the static ring is sleeved on the outside of the rotating shaft, a dynamic ring and an open fixing ring are sleeved on the outside of the rotating shaft, the dynamic ring is located between the static ring and the open fixing ring, a round nut is sleeved on the outside of the rotating shaft, and the rotating shaft is threadedly connected with the round nut, the round nut is located above the two tapered roller bearings, a steel pipe is installed on the boiler shell, a flange is installed on the steel pipe, a bolt is installed on the flange sealing seat, a nut is threadedly connected with the bolt, and the bolt and the nut are used for fixing the flange sealing seat and the flange.

[0006] Further, adjusting washers are installed between the flange sealing seat and the bearing end cover.

[0007] Further, Z-shaped rubber sealing rings are installed between the rotating shaft and the bearing end cover.

[0008] Further, a bearing chamber is reserved between the rotating shaft, the flange sealing seat and the bearing end cover, and the bearing positioning sleeve and the two tapered roller bearings are located inside the bearing chamber.

[0009] Further, a second O-shaped rubber ring is installed between the static ring mounting plate and the flange sealing seat, and a mechanical sealing chamber is reserved between the rotating shaft, the static ring mounting plate and the flange sealing seat.

[0010] Further, a first O-shaped rubber ring is installed between the rotating shaft and the flange sealing seat, and the first O-shaped rubber ring is used for separating the bearing chamber and the mechanical sealing chamber.

[0011] Further, sealing washers are installed between the flange sealing seat and the flange.

[0012] Further, two L-shaped through holes that are symmetrically arranged are formed in the flange sealing seat, the two L-shaped through holes are communicated with the mechanical sealing chamber, and a pair of wires are installed at the top end of the L-shaped through hole.

[0013] In conclusion, the technical effect and advantages of the application are as follows:

[0014] In the utility model, the conical roller bearing of " face to face " installation is used between the rotating shaft and the flange sealing seat, and the centring property of the rotating shaft is ensured; the full water state in the hot water boiler can form liquid film on the friction surface of the dynamic ring and the static ring, and the sealing property in the rotating or static state is ensured; when the hot water boiler is not full of water, the formation of the liquid film on the friction surface of the dynamic ring and the static ring can be completed by the external flushing circulating water; the mechanical seal can bear high pressure, and the pressure of the external flushing circulating water can offset part of the internal pressure of the boiler; the flushing circulating water can also play a cooling role; the first O-shaped rubber ring is used to isolate the mechanical seal chamber and the bearing chamber, water is prevented from entering the bearing chamber to damage the bearing, and the lubricating grease is also prevented from contaminating the cooling water; the mechanical seal chamber cooperates with the first O-shaped rubber ring to form a double sealing system, high speed rotation can be realized, the electrode protection shield can be quickly driven to move up and down, the boiler power can be quickly adjusted, and the working efficiency is improved; the double sealing system can be used for separate water pressure sealing test and dynamic balance test, and is easy to install, disassemble and centre, and when water leakage occurs in the boiler, the parts can be replaced individually, and the maintenance progress is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required to be used in the embodiments or the prior description will be briefly introduced.

[0016] Figure 1 It is a sectional view of a rotating sealing device for an electrode boiler in the embodiments of the present application.

[0017] Figure 2 It is an enlarged schematic view of A in the embodiments of the present application.

[0018] Figure 3 It is an enlarged schematic view of B in the embodiments of the present application.

[0019] Figure 4 It is an enlarged schematic view of C in the embodiments of the present application.

[0020] In the drawing: 1, rotating shaft; 2, static ring; 3, static ring mounting plate; 4, first screw; 5, flange sealing seat; 6, first O-shaped rubber ring; 7, second O-shaped rubber ring; 8, dynamic ring; 9, open fixing ring; 10, conical roller bearing; 11, bearing positioning sleeve; 12, adjusting gasket; 13, round nut; 14, bearing end cover; 15, steel pipe; 16, nut; 17, flange; 18, sealing gasket; 19, bolt; 20, second screw; 21, Z-shaped rubber sealing ring; 22, pair of wires; 23, boiler shell. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments.

[0022] Embodiment: refer to Figures 1-4 The utility model discloses a kind of rotating sealing devices for electrode boiler, including rotating shaft 1 and boiler shell 23, rotating shaft 1 is equipped with two conical roller bearings 10, and rotating shaft 1 is transitionally cooperated with the inner ring of conical roller bearings 10, two conical roller bearings 10 adopt the installation mode of "face to face", the outside of rotating shaft 1 is sleeved with bearing positioning sleeve 11, and rotating shaft 1 is clearance fit with bearing positioning sleeve 11, two conical roller bearings 10 are respectively installed at the both ends of bearing positioning sleeve 11, bearing positioning sleeve 11 is used for the positioning of two conical roller bearings 10, the outside of rotating shaft 1 is sleeved with round nut 13, and rotating shaft 1 is threadedly connected with round nut 13, round nut 13 is located above two conical roller bearings 10, round nut 13 plays the role of preventing the axial displacement of the inner ring of upper conical roller bearings 10, and also plays the role of adjusting bearing clearance, the interval of two conical roller bearings 10 is 100mm, guarantee rotating shaft 1 always coaxial during rotation process;

[0023] Flange sealing seat 5 is installed on lower conical roller bearings 10, bearing end cover 14 is installed on another conical roller bearings 10, adjusting washer 12 is installed between flange sealing seat 5 and bearing end cover 14, Z-shaped rubber sealing ring 21 is installed between rotating shaft 1 and bearing end cover 14, bearing chamber is reserved between rotating shaft 1, flange sealing seat 5 and bearing end cover 14, lubricating grease is coated in bearing chamber, bearing positioning sleeve 11 and two conical roller bearings 10 are all inside bearing chamber;

[0024] Second screw 20 is installed on bearing end cover 14, and second screw 20 is used for the fixation of flange sealing seat 5 and bearing end cover 14, static ring mounting plate 3 is sleeved on the outside of rotating shaft 1, first screw 4 is installed on static ring mounting plate 3, and first screw 4 is used for the fixation of static ring mounting plate 3 and flange sealing seat 5, second O-shaped rubber ring 7 is installed between static ring mounting plate 3 and flange sealing seat 5, mechanical sealing chamber is reserved between rotating shaft 1, static ring mounting plate 3 and flange sealing seat 5;

[0025] First O-shaped rubber ring 6 is installed between rotating shaft 1 and flange sealing seat 5, and first O-shaped rubber ring 6 is used for the separation of bearing chamber and mechanical sealing chamber, prevent water in mechanical sealing chamber from entering bearing chamber or prevent lubricating grease in bearing chamber from entering mechanical sealing chamber;

[0026] The static ring 2 is installed on the static ring mounting plate 3, and is sleeved on the outside of the rotating shaft 1, the dynamic ring 8 and the open fixing ring 9 are sleeved on the outside of the rotating shaft 1, the dynamic ring 8 is located between the static ring 2 and the open fixing ring 9, the spring compression amount of the dynamic ring 8 is adjusted by means of the open fixing ring 9, the open fixing ring 9 is provided with locking bolts, after the locking bolts are tightened, the open fixing ring 9 can tightly hold the rotating shaft 1, the spring of the dynamic ring 8 has a free length before being compressed, according to the pressure size, the spring is compressed to a certain distance by the open fixing ring 9, so as to ensure that the dynamic ring 8 and the static ring 2 are tightly attached together, and the static ring 2, the dynamic ring 8 and the open fixing ring 9 are all located in the mechanical seal chamber;

[0027] The steel pipe 15 is installed on the boiler shell 23, the flange 17 is installed on the steel pipe 15, the sealing gasket 18 is installed between the flange sealing seat 5 and the flange 17, the bolt 19 is installed on the flange sealing seat 5, the nut 16 is threadedly connected with the bolt 19, and the bolt 19 and the nut 16 are used for fixing the flange sealing seat 5 and the flange 17, two L-shaped through holes that are symmetrically arranged are formed in the flange sealing seat 5, the two L-shaped through holes are communicated with the mechanical seal chamber, and the top end of the L-shaped through hole is provided with the pair of wires 22;

[0028] The internal pressure of the boiler is 2.5 MPa, the cooling water is pressurized to 0.6 MPa, and the actual pressure borne by the mechanical seal is 1.9 MPa; the cooling water functions to cool the static ring 2 and the dynamic ring 8 of the mechanical seal, reduce the pressure effect of the internal pressure of the boiler, and prolong the service life of the dynamic and static seal; if the pressure of the cooling water is increased, the mechanical seal leakage can be predicted.

[0029] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotary sealing device for an electrode boiler, comprising a rotating shaft (1) and a boiler shell (23), characterized in that: Two tapered roller bearings (10) are mounted on the rotating shaft (1), and there is a transition fit between the rotating shaft (1) and the inner ring of the tapered roller bearings (10). A bearing positioning sleeve (11) is sleeved on the outside of the rotating shaft (1), and there is a clearance fit between the rotating shaft (1) and the bearing positioning sleeve (11). The two tapered roller bearings (10) are respectively mounted on both ends of the bearing positioning sleeve (11). A flange sealing seat (5) is mounted on the lower tapered roller bearing (10), and a bearing end cover (14) is mounted on the other tapered roller bearing (10). A second screw (20) is mounted on the bearing end cover (14), and the second screw (20) is used to fix the flange sealing seat (5) and the bearing end cover (14). A stationary ring mounting plate (3) is sleeved on the outside of the rotating shaft (1), and a first screw (4) is mounted on the stationary ring mounting plate (3). The first screw (4) is used to fix the stationary ring. The mounting plate (3) and flange sealing seat (5) are fixed. A stationary ring (2) is installed on the stationary ring mounting plate (3). The stationary ring (2) is sleeved on the outside of the rotating shaft (1). A rotating ring (8) and an open fixing ring (9) are sleeved on the outside of the rotating shaft (1). The rotating ring (8) is located between the stationary ring (2) and the open fixing ring (9). A round nut (13) is sleeved on the outside of the rotating shaft (1). The rotating shaft (1) is threadedly connected to the round nut (13). The round nut (13) is located above the two tapered roller bearings (10). A steel pipe (15) is installed on the boiler shell (23). A flange (17) is installed on the steel pipe (15). A bolt (19) is installed on the flange sealing seat (5). A nut (16) is threaded on the bolt (19). The bolt (19) and the nut (16) are used to fix the flange sealing seat (5) and the flange (17).

2. The rotary sealing device for an electrode boiler according to claim 1, characterized in that: An adjusting shim (12) is installed between the flange sealing seat (5) and the bearing end cover (14).

3. The rotary sealing device for an electrode boiler according to claim 1, characterized in that: A Z-shaped rubber sealing ring (21) is installed between the rotating shaft (1) and the bearing end cover (14).

4. The rotary sealing device for an electrode boiler according to claim 1, characterized in that: A bearing chamber is reserved between the rotating shaft (1), the flange sealing seat (5) and the bearing end cover (14), and the bearing positioning sleeve (11) and the two tapered roller bearings (10) are all located inside the bearing chamber.

5. A rotary sealing device for an electrode boiler according to claim 1, characterized in that: A second O-ring (7) is installed between the stationary ring mounting plate (3) and the flange sealing seat (5), and a mechanical seal chamber is reserved between the rotating shaft (1), the stationary ring mounting plate (3) and the flange sealing seat (5).

6. A rotary sealing device for an electrode boiler according to claim 5, characterized in that: A first O-ring (6) is installed between the rotating shaft (1) and the flange sealing seat (5). The first O-ring (6) is used to separate the bearing chamber from the mechanical seal chamber.

7. A rotary sealing device for an electrode boiler according to claim 1, characterized in that: A sealing gasket (18) is installed between the flange sealing seat (5) and the flange (17).

8. A rotary sealing device for an electrode boiler according to claim 5, characterized in that: The flange sealing seat (5) has two symmetrically arranged L-shaped through holes, both of which are connected to the mechanical seal chamber. The top of the L-shaped through holes is fitted with a threaded thread (22).

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