Safety type water turbine outward-opening man entrance door

Abstract

The utility model discloses a safety type water turbine outward opening mandoor which comprises a door seat, a door cover and a clamping ring, an inner hole is formed in the center of the door seat, the door cover is located in the inner hole, the clamping ring is fixedly arranged in the middle of the inner hole, and the clamping ring is located on the outer side of the door cover. And the inner hole of the door seat prevents the door cover from moving towards the inner side. The outward opening door has the advantage that a hole formed in a volute or a draft tube body of a traditional outward opening door is small, the door cover transmits outward hydraulic thrust to the door seat through the clamping ring, bolts are not adopted for bearing the hydraulic thrust, and the huge risk that a plant is flooded by water due to bolt breakage is fundamentally avoided.

Description

Technical Field

[0001] The utility model relates to an access door of a water turbine, and more specifically, to a safe type externally-opening access door of a water turbine. Background Art

[0002] At present, the externally-opening access doors of the spiral case and draft tube of water turbines and pump-turbines adopt the method of using bolts to bear the water pressure thrust, and the bolts become the weak links. The bolts of the access door of the water distribution penstock of Jinniu Hydropower Station broke, causing the powerhouse to be flooded. For the inward-opening door, the minimum passing dimension is at the door frame component. Therefore, the size of the door cover is relatively large, resulting in a relatively large opening in the pressure-bearing shell, and the strength problem is relatively prominent, so the reinforcement range increases accordingly. At the same time, the support of the inward-opening door cover occupies the passing space of the door hole, and the door hole needs to be further enlarged. Some inward-opening door covers of smaller shells will occupy the limited personnel activity space.

[0003] The utility model patent with the application number 202320545399.6 discloses an access door structure and a water turbine. The access door mounting seat has an access hole and a plurality of first threaded holes and a plurality of second threaded holes arranged around the access hole; the access door cover is hingedly installed on the mounting body. The access door cover has first bolt mounting holes corresponding to the first threaded holes and second bolt mounting holes corresponding to the second threaded holes; working bolts are installed in the first bolt mounting holes, and safety bolts are installed in the second bolt mounting holes. When water flow is introduced into the mounting body in this application, only the working bolts bear the alternating working load, while the safety bolts only bear the pre-tightening force of the second bolts for their own installation and are in an absolutely safe state. When the working bolts bear the working load and break, the safety bolts can bear the subsequent working load, thus avoiding major safety accidents such as the powerhouse being flooded after the working bolts of the access door break. This application has a plurality of second bolt mounting holes and working bolts, which increases the processing difficulty and the volume of the object. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a safe type externally-opening access door of a water turbine, which includes a door seat, a door cover and a snap ring. An inner hole is provided in the center of the door seat. The door cover is located inside the inner hole. The snap ring is fixedly arranged in the middle of the inner hole, and the snap ring is located outside the door cover; the inner hole of the door seat blocks the door cover from moving inward.

[0005] Preferably, the inner hole of the door seat abuts against the door cover on the inner side; an annular snap ring groove is provided in the middle of the inner hole, and the snap ring is located in the snap ring groove.

[0006] Preferably, the cross-section of the door cover is circular.

[0007] Preferably, a shoulder is provided in the middle of the inner hole of the seat, and the size of the outer part of the inner hole located outside the shoulder is larger than that of the inner part located inside the shoulder; the shape of the cover is adapted to the shape of the inner hole.

[0008] Preferably, a sealing ring is provided at the mating portion of the inner hole of the seat and the outer circle of the cover; the sealing ring includes an O-ring and a formed sealing ring arranged in sequence from the inside to the outside.

[0009] Preferably, the snap ring is composed of multiple disconnected sections; a retaining ring is provided on the inner edge of the snap ring, a ring groove is provided on the side surface of the cover, and the retaining ring is located in the ring groove; the retaining ring is fixedly connected to the side surface of the cover.

[0010] Preferably, it further includes a lifting appliance, and the lifting appliance is fixedly connected to the cover.

[0011] Preferably, the lifting appliance is fixedly connected to the cover by bolts; a lifting hole is provided on the lifting appliance, and the lifting hole corresponds to the center of gravity of the combined body of the cover and the lifting appliance, so that the cover remains in a vertical state during lifting.

[0012] Preferably, a handle hole is provided on the lifting appliance.

[0013] Preferably, a plurality of positioning blocks are provided on the seat, and the lifting appliance is clamped between the positioning blocks.

[0014] Beneficial effects:

[0015] The present utility model is an outward-opening door, so it has the advantages of a traditional outward-opening door with a smaller opening in the volute or the draft tube body. The cover transfers the outward water thrust to the seat through the snap ring, and bolts are not used to bear the water thrust, fundamentally avoiding the huge risk of flooding the powerhouse caused by bolt fracture. Brief description of the drawings

[0016] Figure 1 It is a schematic structural diagram of the safe outward-opening access door of the water turbine according to Embodiment 1 of the present utility model.

[0017] Figure 2 It is a schematic structural diagram of the safe outward-opening access door of the water turbine according to Embodiment 2 of the present utility model.

[0018] Figure 3 It is a schematic structural diagram of the safe outward-opening access door of the water turbine according to Embodiment 3 of the present utility model.

[0019] Figure 4 It is a schematic structural diagram of the safe outward-opening access door of the water turbine according to Embodiment 4 of the present utility model.

[0020] In the figure: 1. pedestal, 2. O-ring seal, 3. formed seal ring, 4. snap ring, 5. retaining ring, 6. door cover, 7. positioning block, 8. spreader, 9. bolt, 10. pressure-bearing housing, 11. lifting hole, 12. handle hole, 13. rotating baffle. Detailed implementation mode

[0021] The technical solution of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.

[0022] Embodiment 1: As Figure 1 shown, this embodiment discloses a safe type of water turbine external access door, including a pedestal 1, a door cover 6 and a snap ring 4. An inner hole is provided at the center of the pedestal 1. The door cover 6 is located inside this inner hole (the water thrust borne by the door cover 6 points to the outside). An annular snap ring groove is provided in the inner hole. The snap ring 4 is located in the snap ring groove. The snap ring 4 is located outside the door cover 6 and is connected to the snap ring 4. The inner hole of the pedestal 1 blocks the door cover 6 from moving inward.

[0023] The door cover transmits the outward water thrust to the pedestal through the snap ring, without using bolts to bear the water thrust, fundamentally avoiding the inner hole of the pedestal 1 from abutting against the door cover 6 on the inner side.

[0024] The cross-section of the door cover 6 can be circular, and circular processing is easier.

[0025] A shoulder is provided in the middle of the inner hole of the pedestal 1. The diameter of the outer part of the inner hole located outside the shoulder is larger than the diameter of the inner part located inside the shoulder. The shape of the door cover 6 is adapted to the shape of the inner hole. The shoulder is used for inward positioning of the door cover 6.

[0026] A seal ring is provided at the mating part of the inner hole of the pedestal 1 and the outer circle of the door cover 6.

[0027] The seal ring includes an O-ring seal 2 and a formed seal ring 3 arranged in sequence from the inside to the outside.

[0028] The snap ring 4 is composed of multiple disconnected sections.

[0029] A retaining ring 5 is provided on the inner edge of the snap ring 4. The retaining ring 5 is fixedly connected to the side surface of the door cover 6 through a bolt 9. The retaining ring 5 restricts the snap ring 4 from withdrawing.

[0030] A ring groove is provided on the side surface of the door cover 6. The retaining ring 5 is located in this ring groove.

[0031] The pedestal 1 is welded to the center of the pressure-bearing housing.

[0032] The pedestal 1 of the utility model is welded on the pressure-bearing shell. The inner hole of the pedestal is machined to accommodate the door cover. The shoulder is used for the inward positioning of the door cover 6. A sealing ring is provided at the mating part with the outer circle of the door cover 6. A snap ring groove is machined in the inner hole of the pedestal. After the split snap ring 4 is installed, a retaining ring 5 is installed on the inner edge of the snap ring 4, and the retaining ring 5 is fixed in the annular groove on the door cover with bolts. The retaining ring 5 restricts the withdrawal of the snap ring 4. These bolts are only used to fix the retaining ring 5. The water thrust borne by the door cover 6 is transmitted to the pedestal 1 through the snap ring 4, which is safe and reliable.

[0033] Embodiment 2: As Figure 2 shown, this embodiment discloses a safe type of inward-opening access door for a water turbine, including a pedestal 1, a door cover 6, and a snap ring 4. The center of the pedestal 1 is provided with an inner hole. The door cover 6 is located inside this inner hole (the water thrust borne by the door cover 6 points outward). The inner hole is provided with an annular snap ring groove. The snap ring 4 is located in the snap ring groove. The snap ring 4 is located on the outer side of the door cover 6 and is connected to the snap ring 4. The inner hole of the pedestal 1 blocks the inward movement of the door cover 6.

[0034] The door cover transmits the outward water thrust to the pedestal through the snap ring, without using bolts to bear the water thrust, fundamentally avoiding the huge risk of flooding the powerhouse caused by bolt fracture.

[0035] The inner hole of the pedestal 1 abuts against the door cover 6 on the inner side.

[0036] The cross-section of the door cover 6 is circular.

[0037] The inner side of the inner hole of the pedestal 1 is conical, and the corresponding door cover 6 is also conical. The diameter of the inner hole increases from the inside to the outside. The conical inner hole prevents the door cover 6 from slipping out inward. The inclination angle of the cone can be very small, as long as the door cover 6 does not slip out inward.

[0038] A sealing ring is provided at the mating part of the inner hole of the pedestal 1 and the outer circle of the door cover 6.

[0039] The sealing ring includes an O-ring 2 and a formed sealing ring 3 arranged in sequence from the inside to the outside.

[0040] The snap ring 4 is composed of multiple disconnected sections.

[0041] A retaining ring 5 is provided on the inner edge of the snap ring 4. The retaining ring 5 is fixedly connected to the side surface of the door cover 6 through bolts 9, and the retaining ring 5 restricts the withdrawal of the snap ring 4.

[0042] An annular groove is provided on the side surface of the door cover 6, and the retaining ring 5 is located in this annular groove.

[0043] The pedestal 1 is welded to the center of the pressure-bearing shell 10.

[0044] The pedestal 1 of the present utility model is welded to the pressure-bearing housing 10. The inner hole of the pedestal is machined to accommodate the door cover. The conical inner hole is used for the inward positioning of the door cover 6. A sealing ring is provided at the mating part with the outer circle of the door cover 6. A snap ring groove is machined in the inner hole of the pedestal. After the split snap ring 4 is installed, a retaining ring 5 is installed on the inner edge of the snap ring 4. The retaining ring 5 is fixed in the annular groove on the door cover with bolts. The retaining ring 5 restricts the withdrawal of the snap ring 4. These bolts are only used to fix the retaining ring 5. The water thrust borne by the door cover 6 is transmitted to the pedestal 1 through the snap ring 4, which is safe and reliable.

[0045] Embodiment 3: As Figure 3 shown, this embodiment discloses a safe type of inward-opening access door for a water turbine, including a pedestal 1, a door cover 6 and a snap ring 4. The center of the pedestal 1 is provided with an inner hole. The door cover 6 is located inside this inner hole (the water thrust borne by the door cover 6 points outward). The inner hole is provided with an annular snap ring groove. The snap ring 4 is located in the snap ring groove. The snap ring 4 is located on the outer side of the door cover 6 and is connected to the snap ring 4;

[0046] The cross-section of the door cover 6 is circular, the door cover 6 is cylindrical, and the inner hole of the pedestal 1 is circular.

[0047] A sealing ring is provided at the mating part of the inner hole of the pedestal 1 and the outer circle of the door cover 6.

[0048] The sealing ring includes an O-ring 2 and a formed sealing ring 3 arranged in sequence from the inside to the outside.

[0049] Several rotating baffles 13 are provided at the inner edge of the door cover 6. The rotating shafts of the rotating baffles 13 are arranged on the pedestal 1 and can block the inside of the door cover 6 after rotation.

[0050] The snap ring 4 is composed of multiple disconnected sections.

[0051] A retaining ring 5 is provided at the inner edge of the snap ring 4. The retaining ring 5 is fixedly connected to the side surface of the door cover 6 through bolts 9. The retaining ring 5 restricts the withdrawal of the snap ring 4.

[0052] An annular groove is provided on the side surface of the door cover 6. The retaining ring 5 is located in this annular groove.

[0053] The pedestal 1 of the present utility model is welded to the center of the pressure-bearing housing 10.

[0054] The pedestal 1 of the present utility model is welded to the pressure-bearing housing 10. The inner hole of the pedestal is machined to accommodate the door cover. The rotating baffle 13 is used for the inward positioning of the door cover 6. A sealing ring is provided at the mating part with the outer circle of the door cover 6. A snap ring groove is machined in the inner hole of the pedestal. After the split snap ring 4 is installed, a retaining ring 5 is installed on the inner edge of the snap ring 4. The retaining ring 5 is fixed in the annular groove on the door cover with bolts 9. The retaining ring 5 restricts the withdrawal of the snap ring 4. The water thrust borne by the door cover 6 is transmitted to the pedestal 1 through the snap ring 4, which is safe and reliable.

[0055] Embodiment 4: As Figure 4As shown in the figure, this embodiment discloses a safe type of external access door for a water turbine, which includes a seat 1, a cover 6, and a snap ring 4. The center of the seat 1 is provided with an inner hole. The cover 6 is located inside this inner hole (the water thrust borne by the cover 6 points outward). The inner hole is provided with an annular snap ring groove, and the snap ring 4 is located in the snap ring groove. The snap ring 4 is connected to the outside of the cover 6; the inner hole of the seat 1 blocks the cover 6 from moving inward.

[0056] The cover transfers the outward water thrust to the seat through the snap ring, and does not use bolts to bear the water thrust, fundamentally avoiding the huge risk of flooding the powerhouse caused by bolt fracture.

[0057] The inner hole of the seat 1 abuts against the cover 6 on the inner side.

[0058] The cross-section of the cover 6 can be circular, and circular processing is easier.

[0059] The middle part of the inner hole of the seat 1 is provided with a shoulder. The diameter of the outer part of the inner hole located outside the shoulder is larger than the diameter of the inner part located inside the shoulder; the shape of the cover 6 is adapted to the shape of the inner hole; the shoulder is used for positioning the cover 6 inward.

[0060] A sealing ring is provided at the mating part of the inner hole of the seat 1 and the outer circle of the cover 6.

[0061] The sealing ring includes an O-ring 2 and a formed sealing ring 3 arranged in sequence from the inside to the outside.

[0062] The snap ring 4 is composed of multiple disconnected sections.

[0063] A retaining ring 5 is provided on the inner edge of the snap ring 4. The retaining ring 5 is fixedly connected to the side surface of the cover 6 through a bolt 9, and the retaining ring 5 restricts the snap ring 4 from withdrawing.

[0064] A ring groove is provided on the side surface of the cover 6, and the retaining ring 5 is located in this ring groove.

[0065] The seat 1 is welded to the center of the pressure-bearing housing.

[0066] The safe type of external access door for a water turbine further includes a lifting device 8, and the lifting device 8 is used to lift the cover 6.

[0067] The lifting device 8 is fixedly connected to the cover 6 through a bolt 9 at the center of the cover 6.

[0068] The lifting device 8 is provided with a lifting hole 11, and the lifting hole 11 corresponds to the center of gravity of the combined body of the cover 6 and the lifting device 8, so that the cover 6 is kept in a vertical state during lifting.

[0069] A number of handle holes 12 are provided on the lifting device 8.

[0070] A number of positioning blocks 7 are fixedly arranged on the portal 1. When the door cover 6 is installed, the main body of the lifting appliance 8 is stuck between the positioning blocks 7 to ensure the correct installation orientation of the door cover 6.

[0071] In the utility model, the portal 1 is welded to the pressure-bearing shell. The inner hole of the portal is machined to accommodate the door cover. The shoulder is used for the inward positioning of the door cover 6. A sealing ring is arranged at the place where it cooperates with the outer circle of the door cover 6. A snap ring groove is machined in the inner hole of the portal. After the split snap ring 4 is installed, a retaining ring 5 is installed on the inner edge of the snap ring 4. The retaining ring 5 is fixed in the annular groove on the door cover with bolts. The retaining ring 5 restricts the snap ring 4 from withdrawing. These bolts are only used to fix the retaining ring 5. The water thrust borne by the door cover 6 is transmitted to the portal 1 through the snap ring 4, which is safe and reliable. The door cover 6 is provided with a lifting appliance 8 for facilitating the use of lifting equipment. The lifting hole corresponds to the center of gravity of the combination of the door cover and the lifting appliance. When lifting, the door cover is kept in a vertical state to facilitate disassembly and assembly operations. This structure not only maintains the advantage of the existing outward-opening door with a smaller opening in the shell, avoiding the disadvantage of the outward-opening door bolts bearing the water thrust of the door cover; but also has the advantage of the inward-opening door not using bolts to transmit the water thrust of the door cover, avoiding the disadvantage of the large reinforcement size of the inward-opening door opening and occupying the limited passage space.

[0072] Processing method: Enter the portal to machine the mating surface with the door cover, and machine the sealing groove. Install the sealing strip to form a seal with the outer circle of the door cover. The portal has a snap ring groove. A snap ring is installed at the snap ring groove. The snap ring blocks the door cover and bears the water thrust of the door cover. A retaining ring is installed on the inner edge side of the snap ring to prevent the snap ring from coming out. The retaining ring is fixed in the annular groove of the door cover with bolts. The bolts are only used for fixing the retaining ring. The lifting appliance is connected to the door cover with bolts. The lifting hole of the lifting appliance corresponds to the center of gravity of the combination of the door cover and the lifting appliance. A handle hole is opened on the lifting appliance to facilitate the operator to hold. The positioning blocks are arranged on the portal. When the door cover is installed, the main body of the lifting appliance is stuck between the positioning blocks to ensure the correct installation orientation of the door cover.

[0073] Embodiment 5: This embodiment discloses a safe outward-opening access door for a water turbine, including a portal 1, a door cover 6 and a snap ring 4. The center of the portal 1 is provided with an inner hole. The door cover 6 is located inside this inner hole (the water thrust borne by the door cover 6 points outward). The inner hole is provided with an annular snap ring groove. The snap ring 4 is located in the snap ring groove. The snap ring 4 is located outside the door cover 6 and is in contact with the snap ring 4. The inner hole of the portal 1 blocks the door cover 6 from moving inward.

[0074] The door cover transmits the outward water thrust to the portal through the snap ring, without using bolts to bear the water thrust, fundamentally avoiding the huge risk of flooding the plant caused by bolt fracture.

[0075] The inner hole of the portal 1 abuts against the door cover 6 on the inner side.

[0076] The cross-section of the door cover 6 is square, and correspondingly, the inner hole of the portal 1 is also square.

[0077] A shoulder is provided in the middle of the inner hole of the portal frame 1, and the size of the outer part of the inner hole located outside the shoulder is larger than that of the inner part located inside the shoulder; the shape of the door cover 6 is adapted to the shape of the inner hole; the shoulder is used for positioning the door cover 6 inward.

[0078] A sealing ring is provided at the mating part between the inner hole of the portal frame 1 and the outer circle of the door cover 6.

[0079] The sealing ring includes an O-ring 2 and a formed sealing ring 3 arranged in sequence from the inside to the outside.

[0080] The snap ring 4 is composed of multiple disconnected sections.

[0081] A retaining ring 5 is provided on the inner edge of the snap ring 4, and the retaining ring 5 is fixedly connected to the side surface of the door cover 6 through a bolt 9, and the retaining ring 5 restricts the snap ring 4 from withdrawing.

[0082] The portal frame 1 is welded to the center of the pressure-bearing housing.

[0083] The safety type water turbine external access door further includes a lifting tool 8, and the lifting tool 8 is used for lifting the door cover 6.

[0084] The lifting tool 8 and the door cover 6 are fixedly connected through a bolt 9 at the center of the door cover 6.

[0085] The lifting tool 8 is provided with a lifting hole 11, and the lifting hole 11 corresponds to the center of gravity of the combination of the door cover 6 and the lifting tool 8, and keeps the door cover 6 in a vertical state during lifting.

[0086] A plurality of handle holes 12 are provided on the lifting tool 8.

[0087] A plurality of positioning blocks 7 are fixedly provided on the portal frame 1, and the main body of the lifting tool 8 is stuck between the positioning blocks 7 when the door cover 6 is installed to ensure the correct installation orientation of the door cover 6.

[0088] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety type water turbine external access door, comprising a door seat (1) and a door cover (6), wherein the door cover (6) is located in the inner hole of the door seat (1), and is characterized in that, It further includes a snap ring (4), the snap ring (4) is arranged in the inner hole, and the snap ring (4) is located outside the door cover (6).

2. The safety type water turbine external access door according to claim 1, characterized in that, The inner hole of the door seat (1) abuts against the door cover (6) on the inner side; an annular snap ring groove is provided in the middle of the inner hole, and the snap ring (4) is located in the snap ring groove.

3. A safety type water turbine external access door according to claim 1 or 2, characterized in that, The cross-section of the door cover (6) is circular.

4. A safety type water turbine external access door according to claim 2, characterized in that A shoulder is provided in the middle of the inner hole of the door seat (1), and the dimension of the outer part of the inner hole located outside the shoulder is larger than that of the inner part located inside the shoulder; the shape of the door cover (6) is adapted to the shape of the inner hole.

5. A safety type water turbine external access door according to claim 3, characterized in that, A sealing ring is provided at the mating part of the inner hole of the door seat (1) and the outer circle of the door cover (6); the sealing ring includes an O-ring (2) and a formed sealing ring (3) arranged in sequence from the inside to the outside.

6. A safety type water turbine external access door according to claim 2 or 4, characterized in that, The snap ring (4) is composed of multiple sections that are disconnected from each other. A retaining ring (5) is provided on the inner edge of the snap ring (4), a ring groove is provided on the side surface of the door cover (6), and the retaining ring (5) is located in the ring groove; the retaining ring (5) is fixedly connected to the side surface of the door cover (6).

7. A safety type water turbine external access door according to claim 1 or 2, characterized in that It further includes a lifting device (8), and the lifting device (8) is fixedly connected to the door cover (6).

8. A safety type water turbine external access door according to claim 7, characterized in that, It further includes a bolt (9); the bolt (9) passes through the connection part of the lifting device (8) and the door cover (6), and the head is threadedly connected to the door cover (6). A lifting hole (11) is provided on the lifting device (8). When the door cover (6) is in a vertical state, the lifting hole (11) and the center of gravity of the combination of the door cover (6) and the lifting device (8) are located on the same vertical line.

9. A safety type water turbine external access door according to claim 7, characterized in that, A handle hole (12) is formed on the lifting device (8).

10. A safety type water turbine external access door according to claim 7, characterized in that, A plurality of positioning blocks (7) are provided on the door seat (1), and the lifting device (8) is clamped between the positioning blocks (7).

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