Protective device for upper rack of water-turbine generator set

Abstract

The invention discloses a protective device for an upper rack of a water-turbine generator set, and relates to the field of maintenance equipment of the water-turbine generator set, the protective device is formed by splicing a plurality of protective net assemblies, and each protective net assembly comprises a protective net and a buffer fixing lantern ring arranged on the protective net; the buffer fixing lantern ring comprises a protective net connecting ring, a protective net fixing sleeve ring and a buffer fixing sleeve ring, wherein a groove is formed in the protective net connecting ring, and an opening of the groove is located in the outer side of the protective net connecting ring; the lantern ring is arranged on the inner side of the protective net connecting ring and used for being arranged on a cushion block of an upper rack in a sleeving mode; the first end of the buffer spring is connected with the inner side of the protective net connecting ring; and the second end of the buffer spring is connected with the outer side of the lantern ring. The protective net is used for anti-falling protection of the upper racks in the water-turbine generator set, the protective net is arranged on the cushion blocks on the upper racks in a sleeving mode through the buffering fixing lantern rings, the gap between the upper racks can be effectively covered, the safety of workers and equipment is guaranteed, and the working environment of the upper racks is improved.

Description

Technical Field

[0001] The invention relates to the field of maintenance equipment for a hydro-generator set, in particular to an upper frame protective device for a hydro-generator set. Background Art

[0002] During the installation and maintenance of the hydro-turbine generator set, there is a large gap between the I-beam arms of the generator upper frame, and there is a great safety risk for construction workers walking and working above it.

[0003] The traditional method involves directly wrapping the safety net around the bolts securing the upper rack cover. This method has the following disadvantages: 1. Due to the limited number of bolts securing the upper rack cover, the safety net has significant gaps after installation, rendering it ineffective as a safety measure. 2. The safety net is not securely fastened to the bolts, creating a risk of it falling off.

[0004] Therefore, it is urgent to design a vertical hydro-generator upper frame safety device to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and to design an upper frame protection device for a hydro-generator set.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] The present invention provides a protective device for the upper frame of a hydro-generator set, which is composed of a plurality of protective net components spliced ​​together, and the protective net components include:

[0008] The protective net body adopts a grid-like woven structure to cover the exposed area of ​​the rotating parts of the upper frame;

[0009] The buffer fixing ring is arranged on the edge of the protective net body and includes:

[0010] A protective net connecting ring, wherein a groove is provided on the protective net connecting ring and an opening of the groove is located outside the protective net connecting ring;

[0011] A collar is provided on the inner side of the guard net connecting ring and is used to be sleeved on the pad of the upper frame;

[0012] The buffer spring is used to connect the collar and the protective net connecting ring. The first end of the buffer spring is connected to the inner side of the protective net connecting ring; the second end of the buffer spring is connected to the outer side of the collar, playing a buffering and protective role when the protective net bears weight.

[0013] As a further technical solution of the present invention, at least four buffer fixing rings are provided.

[0014] As a further technical solution of the present invention, the thickness of the guard net connecting ring is less than 1 / 2 of the height of the upper cover plate pad.

[0015] As a further technical solution of the present invention, the protective net is a flame-retardant nylon multifilament woven net with a mesh size of 5-10 mm, a tensile strength of ≥80 MPa, and a temperature resistance level of ≥120°C.

[0016] As a further technical solution of the present invention, the collar is composed of a plurality of arc-shaped blocks and each arc-shaped block is respectively connected to a buffer spring.

[0017] As a further technical solution of the present invention, the buffer spring is welded to the protective net connecting ring.

[0018] As a further technical solution of the present invention, an engineering rubber protective pad is bonded to the inner wall of the arc-shaped block to form a double buffer interface.

[0019] As a further technical solution of the present invention, there are 12 arc blocks and buffer springs, which are evenly distributed on the inner side of the protective net connecting ring.

[0020] As a further technical solution of the present invention, a waist-shaped bolt adjustment hole is provided on the arc block, the major axis of the hole extends along the radial direction of the unit, and the hole length L satisfies: L≥2d+ΔS, where d is the bolt diameter and ΔS is the designed adjustment stroke;

[0021] The second end of the buffer spring is connected to the waist-shaped hole through a slidable bolt assembly. The slidable bolt assembly is rotated to change the initial compression amount of the spring, thereby realizing continuous adjustment of the preload force.

[0022] As a further technical solution of the present invention, a thermal expansion compensation gap δ is provided between the arc blocks, and its value satisfies:

[0023] δ>α·D·ΔT+0.5mm; where:

[0024] α: linear expansion coefficient of the shaft material, 10⁻ 6 / ℃;

[0025] D: nominal diameter of shaft flange, mm;

[0026] ΔT: Unit operating temperature rise, taken as 80℃.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The protective device provided by the present invention is used for anti-fall protection of the upper frame of the hydro-turbine generator set. The upper frame and the upper cover of the hydro-turbine generator set are connected and installed with pads. During the installation and maintenance of the unit, the upper cover needs to be opened. There is a large gap between the I-beams of the upper frame. The protective net is mounted on the pads on the upper frame through a buffer fixing ring, which can effectively cover the gap between the upper frames, ensure the safety of staff and equipment, and improve the working environment of the upper frame.

[0029] 2. A sleeve is provided inside the guard net connecting ring for fitting onto the pad of the upper frame. The sleeve is connected to the guard net connecting ring through a buffer spring, which plays a buffering and protective role when there is load on the guard net.

[0030] 3. The collar is set as a ring structure formed by connecting multiple arc blocks. The arc blocks are connected by telescopic belts. The inner diameter of the collar can be adjusted for the installation of different upper rack pad sizes. The arc blocks and buffer springs jointly realize the adjustment of the inner diameter of the collar, which is convenient for installation and use and has a wide range of applications.

[0031] 4. The angle between the buffer spring and the horizontal plane is set to 30° to protect the buffer fixing ring from stretching and prevent the protective net from sinking and stretching to cause wear on the buffer fixing ring.

[0032] 5. Install a protective pad on the inside of the arc block to reduce installation wear between it and the upper rack pad.

[0033] 6. The buffer spring is connected to the waist-shaped bolt adjustment hole through a sliding bolt assembly. Rotating the sliding bolt assembly can change the initial compression amount of the spring to achieve continuous adjustment of the preload force. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a rendering of the installation effect of the upper frame protection device of the hydro-generator set proposed by the present invention;

[0035] Figure 2 Structural diagram of the upper frame protection device of the hydro-generator set proposed by the present invention

[0036] Figure 3 This is a front view of the buffer fixing ring structure proposed by the present invention;

[0037] Figure 4 A side view of the buffer fixing collar structure proposed by the present invention;

[0038] Figure 5 This is a diagram of the installation structure of the buffer fixing ring and the pad proposed in the present invention;

[0039] As shown in the figure:

[0040] 10-protective net, 20-buffer fixing ring, 30-upper frame, 301-pad, 201-protective net connecting ring, 211-groove, 202-ring, 203-buffer spring, 221-protective pad. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described below with reference to the accompanying drawings and embodiments:

[0042] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] like Figure 1As shown, the present invention provides a protective device for the upper frame of a hydro-generator set, which is composed of a plurality of protective net components. The protective net components include:

[0047] A protective net 10, and a buffer fixing ring 20 provided on the protective net;

[0048] The buffer fixing ring 20 includes:

[0049] A protective net connecting ring 201, wherein a groove 211 is provided on the protective net connecting ring and an opening of the groove is located outside the protective net connecting ring;

[0050] The collar 202 is provided on the inner side of the guard net connecting ring 201 and is used to be sleeved on the pad of the upper frame;

[0051] The buffer spring 203 is used to connect the collar and the protective net connecting ring. The first end of the buffer spring 203 is connected to the inner side of the protective net connecting ring 201; the second end of the buffer spring 203 is connected to the outer side of the collar 202, playing a buffering and protective role when the protective net is bearing weight.

[0052] The protective net body adopts a grid-like woven structure, covering the exposed area of ​​the rotating parts of the upper frame. The buffer fixed ring is arranged at the edge of the protective net, including a protective net connecting ring composed of a metal ring base, a ring and a buffer spring. The outer circumference of the protective net connecting ring is provided with a radially opening U-shaped groove for clamping the lateral protrusion of the upper cover plate pad of the unit; the ring is coaxially arranged on the floating ring body on the inner side of the protective net connecting ring, and the buffer spring is a plurality of groups of spiral compression springs, one end of which is fixedly connected to the inner wall of the protective net connecting ring, and the other end is obliquely connected to the outer wall of the ring to form an elastic buffer interface. The ring holds the unit shaft flange tightly through the pre-compression force of the buffer spring, forming a radial adaptive fastening mechanism.

[0053] The protective device provided by the present invention is used for anti-fall protection of the upper frame 30 in a hydro-turbine generator set. The upper frame of the hydro-turbine generator set is connected and installed with a pad 301 to the upper cover plate. During the installation and maintenance of the unit, the upper cover plate needs to be opened. There is a large gap between the I-beams of the upper frame. The protective net is mounted on the pad on the upper frame through a buffer fixing ring, which can effectively cover the gap between the upper frames, ensure the safety of personnel and equipment, and improve the working environment of the upper frame.

[0054] In the embodiment of the present invention, the size of the protective net can be selected according to the structure of the installed upper frame, and can be square, round or other irregular shapes, which shall be subject to the specific on-site usage. A groove is provided on the outside of the buffer fixing ring for connecting with the protective net, and the corners of the protective net are put on the groove to achieve connection with the buffer fixing ring; the outer edge of the protective net connecting ring is groove-shaped, and the protective net rope can be firmly nested therein. The buffer fixing ring and the protective net can be movably connected to facilitate disassembly and assembly; or it can be set as a fixed connection, which does not require installation when in use and is convenient to use; a ring is provided inside the protective net connecting ring for fitting on the pad of the upper frame, and the ring is connected to the protective net connecting ring by a buffer spring, which plays a buffering and protective role when there is load on the protective net.

[0055] In the embodiment of the present invention, the buffer fixing ring plays the role of connecting the protective net and providing buffer protection. The number of the buffer fixing rings is set according to the number of pads on the upper frame and the shape of the protective net. Preferably, at least four buffer fixing rings 20 are provided, preferably 6-8, which are respectively provided at both ends of the two I-beams of the upper frame to balance the axial vibration load.

[0056] Since the protective net installed on the upper frame is composed of multiple protective nets, at least two buffer fixing rings are installed on the pad of the upper frame. Therefore, the thickness of the protective net connecting ring 201 is less than 1 / 2 of the height of the upper cover pad; that is, the axial thickness H of the protective net connecting ring satisfies the relationship: H<1 / 2H0 (H0 is the height of the upper cover pad), preferably H=(0.3∼0.4)H0, to avoid interference with the unit's heat dissipation duct.

[0057] The protective net 10 is woven from a tough material with a mesh size of 5-10 mm, a tensile strength of ≥80 MPa, and a temperature resistance of ≥120° C. It can be made of multi-strand twisted steel wire rope, nylon, polyethylene, or polyester fiber. Preferably, the protective net is a nylon net.

[0058] To accommodate installations of various hydro-turbine generator sets, the collar 202 in this embodiment of the present invention is composed of several curved segments, each connected to a buffer spring 203. The collar is constructed from at least three circumferentially spliced ​​curved segments, each independently connected to a set of buffer springs, forming discrete buffer units. The collar is configured as an annular structure formed by connecting multiple curved segments, each connected by a telescopic band. The inner diameter of the collar can be adjusted to accommodate installations with various upper frame spacer sizes. The curved segments and buffer springs work together to adjust the collar's inner diameter, facilitating installation and wide applicability.

[0059] The buffer spring is welded to the guard net connecting ring. Alternatively, a snap fastener, bolt, or other connection and fixing structure may be used. The present invention does not limit this, and the buffer spring and the guard net connecting ring are fixedly connected in the present invention.

[0060] In order to reduce the installation wear between the upper frame pad and the upper frame pad, a protective pad 221 is set on the inner side of the arc block. The protective pad 221 is a rubber pad, which is bonded to the inner side of the arc block or fixed by bolts. The rubber has a Shore hardness of 60-70HA and a thickness of 3-5mm, forming a double buffer interface.

[0061] In an embodiment of the present invention, the number of arc blocks and buffer springs 203 can be set as needed. Preferably, the number of arc blocks and buffer springs is 8-12. When 12 are set, they are evenly arranged on the inner side of the guard net connecting ring every 30° along the inner circumference of the guard net connecting ring to achieve full circumferential equal stiffness support.

[0062] For example, for a vertical turbine unit, the protective net has a diameter of Φ2200mm, is braided with 4mm nylon rope, has 8 sets of buffer rings, a spring wire diameter of Φ8mm, and a free length of 50mm. It has been tested to absorb impact energy ≥5J.

[0063] For high-speed units, 12 sets of spring rings are used, the arc blocks are made of aluminum alloy LY12, and the rubber protective pads are provided with heat dissipation grooves to facilitate heat dissipation.

[0064] In order to facilitate installation, a waist-shaped bolt adjustment hole is opened on the arc block. The long axis of the hole extends along the radial direction of the unit. The hole length L meets the following requirements: L≥2d+ΔS, where d is the bolt diameter and ΔS is the designed adjustment stroke.

[0065] The second end of the buffer spring is connected to the waist-shaped bolt adjustment hole via a sliding bolt assembly. Rotating the sliding bolt assembly changes the initial compression of the spring, achieving continuous adjustment of the preload force. This also adjusts the diameter of the collar, allowing the buffer fixing collar to fit over upper frame blocks of different sizes.

[0066] The sliding bolt assembly includes a bolt, a flat washer, a spring washer, and a locking nut. The bolt rod is placed in the waist-shaped bolt adjustment hole, and the spring expansion and contraction amount is fixed by the locking nut. When the locking nut is loosened, the bolt slides radially to change the initial compression amount of the spring. When the locking nut is tightened, the position of the buffer spring is fixed.

[0067] In the embodiment of the present invention, a thermal expansion compensation gap δ is set between the arc blocks, and its value satisfies:

[0068] δ>α·D·ΔT+0.5mm; where:

[0069] α: linear expansion coefficient of the shaft material, 10⁻ 6 / ℃;

[0070] D: nominal diameter of shaft flange, mm;

[0071] ΔT: unit operating temperature rise, taken as 80℃;

[0072] The gap allows the arc block to float radially when the shaft system expands thermally, avoiding equipment deformation caused by rigid constraints.

[0073] In embodiments of the present invention, the buffer spring can be directly welded to the guard net connecting ring, or the inner side of the guard net connecting ring can be designed as a slot to accommodate the buffer spring. A range of springs of different sizes and types are available, allowing different springs to be replaced within the collar to accommodate upper frame spacers of varying sizes and types. The present invention utilizes a slidable bolt assembly to adjust the expansion and contraction of the buffer spring, facilitating the installation of upper frame spacers of varying sizes.

[0074] During the specific implementation of the present invention, after the generator upper frame cover is hoisted out, the four buffer fixing collars can be respectively and correspondingly nested into the pads at the two ends of the two adjacent upper frame beams to ensure that the positions of the four buffer fixing collars can completely cover the gap between the two adjacent upper frame beams after the protective net is installed. After the buffer fixing collar is installed, the net rope of the protective net is nested into the groove of the protective net connecting ring on the outer edge of the buffer fixing collar. When installing the protective net, attention should be paid to controlling the installation effect of the protective net. The protective net should be fully tensioned to avoid sagging and falling, so that the buffer fixing collar can play a buffering and protective role. After the installation is completed, the protective net should be flat and stable, with no gap between it and the upper frame beams. Repeat the above steps until the upper frame beams are completely covered by the protective net.

[0075] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. The upper frame protection device of the hydro-generator set is characterized by: It is composed of several protective net components, including: The protective net body adopts a grid-like woven structure to cover the exposed area of ​​the rotating parts of the upper frame; The buffer fixing ring is arranged on the edge of the protective net body and includes: A protective net connecting ring, wherein a groove is provided on the protective net connecting ring and an opening of the groove is located outside the protective net connecting ring; A collar is provided on the inner side of the guard net connecting ring and is used to be sleeved on the pad of the upper frame; The buffer spring is used to connect the collar and the protective net connecting ring. The first end of the buffer spring is connected to the inner side of the protective net connecting ring; the second end of the buffer spring is connected to the outer side of the collar, playing a buffering and protective role when the protective net bears weight.

2. The upper frame protection device of the hydro-generator set according to claim 1 is characterized in that: At least four buffer fixing rings are provided.

3. The upper frame protection device of the hydro-generator set according to claim 1 is characterized in that: The thickness of the guard net connecting ring is less than 1 / 2 of the height of the upper cover plate pad.

4. The upper frame protection device of the hydro-generator set according to claim 1 is characterized in that: The protective net is a flame-retardant nylon multifilament woven net with a mesh size of 5-10 mm, a tensile strength of ≥80 MPa, and a temperature resistance level of ≥120°C.

5. The upper frame protection device of the hydro-generator set according to claim 1 is characterized in that: The collar is composed of a plurality of arc-shaped blocks, and each arc-shaped block is respectively connected to a buffer spring.

6. The upper frame protection device of the hydro-generator set according to claim 1 is characterized in that: The buffer spring is welded to the protective net connecting ring.

7. The upper frame protection device of the hydro-generator set according to claim 5, characterized in that: The inner wall of the arc block is bonded with an engineering rubber protective pad to form a double buffer interface.

8. The upper frame protection device of the hydro-generator set according to claim 5, characterized in that: There are 12 arc blocks and buffer springs, which are evenly distributed on the inner side of the guard net connecting ring.

9. The upper frame protection device of a hydro-generator set according to claim 5 or 8, characterized in that: The arc block is provided with a waist-shaped bolt adjustment hole, the major axis of which extends radially along the unit, and the hole length L satisfies: L≥2d+ΔS, where d is the bolt diameter and ΔS is the designed adjustment stroke; The second end of the buffer spring is connected to the waist-shaped hole through a slidable bolt assembly. Rotating the bolt can change the initial compression amount of the spring, thereby achieving continuous adjustment of the preload force.

10. The upper frame protection device of a hydro-generator set according to claim 5 or 8, characterized in that: A thermal expansion compensation gap δ is set between the split arc blocks, and its value satisfies: δ>α·D·ΔT+0.5mm; where: α: linear expansion coefficient of the shaft material, 10⁻ 6 / ℃; D: nominal diameter of shaft flange, mm; ΔT: The operating temperature rise of the unit is 80°C. The gap allows the arc block to float radially when the shaft system expands thermally, avoiding equipment deformation caused by rigid constraints.

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