Inlet valve installation structure

Abstract

To provide an installation structure for an inlet valve capable of positioning a centroid of a main body of a rotary valve, which is adopted as the inlet valve, on the same vertical line as a centroid of a hook part of a main winding of an overhead crane without modifying an existent overhead crane.SOLUTION: When changing an inlet valve 8 installed between a water turbine 62 of a water turbine generator and a water pressure iron pipe 7 to a rotary valve in a building in which an overhead crane including a main winding 3 is provided, a dimension L1 from a centerline P2 of the water turbine 62 to an end of a mounting part 63a in a housing 63 of the water turbine 62, a dimension L2 from an end of a connection part 93 in a main body 9 of the inlet valve 8 to an end of a connection part 94 and a dimension L3 of a pipe member 10 in an extension direction to an opposite side of the water turbine 62 are adjusted in such a manner that, in a state where an end 102 of the pipe member 10 can be abutted with an end 71 of a water pressure iron pipe 7, a centroid G1 of the main body of the inlet valve 8 is settled within a range R1 determined by movement of the main winding 3 of an overhead crane 2 and lift of a hook 3a of the main winding 3.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a structure that enables installation within a building even if an inlet valve, for example, located upstream of the turbine of a hydroelectric generator, is changed from an existing valve of one type to a valve of a different type from the existing valve and therefore with larger external dimensions. [Background technology]

[0002] At a certain hydroelectric power plant, when repairing a hydroelectric generator, the inlet valve was changed from a sluice valve, which had a problem of taking a long time to open and close and required a long time to parallelize the generator, to a rotary valve of a different type from the sluice valve. An example of a rotary valve used as an inlet valve for a hydroelectric generator is shown in Patent Document 1.

[0003] However, since rotary valves generally have larger external dimensions than sluice valves, the space in which the sluice valve was installed is insufficient for assembling and disassembling the rotary valve body. For this reason, it is possible to transport the rotary valve body preassembled elsewhere to the location where the sluice valve was installed and install it there, or conversely, to transport the rotary valve assembled from the location where the sluice valve was installed to another location.

[0004] In order to transport such an assembled rotary valve body, since the assembled rotary valve body is heavy, it is considered to use the main hoist (also called the main crane) and auxiliary hoist (also called the sub-crane) of an overhead crane, as shown in Patent Document 2, for example, and therefore, in the above-mentioned specified hydroelectric power plant, the main hoist and auxiliary hoist of the overhead crane already installed in the building will be used. Note that, as a method that does not use an overhead crane, there is a method in which an anchor is driven into the wall of the building to move the rotary valve body up and down, a chain block is hooked to the part of this anchor that protrudes from the wall, and the rotary valve body is pulled in by the chain block, but this method is difficult to adopt due to its lack of safety and operability.

[0005] On the other hand, the overhead crane's main and auxiliary hoists need to stably lift and raise a load (heavy object). For example, Patent Document 3 requires that the center of gravity of the lifting beam and the center of gravity of the object to be suspended be located on the same vertical line so that the load (heavy object) can be stably lifted. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6614368 [Patent Document 2] JP 2011-196605 A [Patent Document 3] JP 2019-64802 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the range determined by the movement of the main hoist of the overhead crane already installed in the building of the specified hydroelectric power plant described above and the lifting height of the hook part of the main hoist (hereinafter, for convenience, referred to as the working range of the hook part of the main hoist) corresponds to a sluice valve, which has smaller external dimensions than a rotary valve. Therefore, if the sluice valve is simply changed to a rotary valve, there is a risk of a problem occurring in that the working range of the main hoist is not set so that the center of gravity of the hook part of the main hoist is located on the same vertical line as the center of gravity of the main body of the rotary valve, even if an attempt is made to install a rotary valve in the place where the sluice valve was installed. Furthermore, even if the range determined by the movement of the auxiliary hoist of the overhead crane and the lifting height of the hook part of the auxiliary hoist (hereinafter, for convenience, referred to as the working range of the hook part of the auxiliary hoist) is a range in which the center of gravity of the hook part of the auxiliary hoist can be positioned on the same vertical line as the center of gravity of the rotary valve, due to the structure of the rotary valve, when installing the rotary valve, such as setting the main body of the rotary valve upright or tipping it over, it is necessary to use the main hoist rather than the auxiliary hoist of the overhead crane.

[0008] In this regard, it is possible to consider modifying or changing the overhead crane, such as by changing the working range of the overhead crane's main hoist, but this has the disadvantage that modifying or changing an overhead crane that is already installed in a building can incur large costs.

[0009] In addition, the inlet valve needs to be connected to an existing pipe such as a penstock on the opposite side (upstream side) of the turbine, but the position of the turbine-side end of the existing pipe is generally suitable for the installation of a sluice valve, which has smaller external dimensions than a rotary valve. Therefore, simply changing the sluice valve to a rotary valve may require cutting the end of the existing pipe to adjust its dimensions in order to connect the upstream connection of the rotary valve to the existing pipe, and further welding the cut end of the existing pipe to the upstream connection of the rotary valve. Cutting the end of the existing pipe and welding the pipe to the rotary valve results in a problem of increased costs for installing the rotary valve.

[0010] The present invention has been made to solve such problems, and its main object is to provide an inlet valve installation structure which enables the center of gravity of the body of a rotary valve which is used in place of a sluice valve as an inlet valve to be within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the main hoist hook, without modifying or changing the existing overhead crane, and which eliminates the need to cut the end of the existing upstream piping, opposite the turbine, to adjust the dimensions. [Means for solving the problem]

[0011] In order to achieve the above object, the inlet valve installation structure of the present invention is provided in a building in which an overhead crane having a main winding and an auxiliary winding is installed, and the inlet valve installation structure is provided in a water turbine of a water turbine generator and a water turbine located upstream of the water turbine. ExistingAn inlet valve installation structure for changing an inlet valve to be installed between a pipe and an existing valve to a valve having an outer dimension larger than that of the existing valve, the inlet valve installation structure comprising: a main body having a casing with a valve body accommodated in an internal space thereof and a connection part provided on each of the upstream side and downstream side of the casing; Connectable to A rotary valve having at least a pipe member is used, and the water turbine has a housing provided with an attachment portion for connecting to a downstream connection portion of a main body of the rotary valve, the existing piping has a turbine side end that can abut against the end of the upstream connection part of the rotary valve body, and the end of the turbine side end of the existing piping is left in the position where the existing valve was installed between the end and the mounting part of the turbine housing, the dimension from the center line of the turbine to the end of the mounting part of the turbine housing is made smaller than when the existing valve was installed, and the dimension from the end of the upstream connection part of the rotary valve body to the end of the downstream connection part is adjusted so that the center of gravity of the rotary valve body is placed in the same position as the existing valve, and by directly connecting the downstream connection part of the rotary valve body to the mounting part of the housing, the center of gravity of the rotary valve body is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the hook of the main hoist. Furthermore, the pipe member is disposed between the upstream connection part of the rotary valve body and the existing piping, and the end of the pipe member opposite to the water turbine is made abuttable against the end of the existing piping on the water turbine side with the end of the pipe member on the upstream side connected to the rotary valve body on the The turbine is, for example, a vertical-axis Francis turbine. The existing valve is, for example, a sluice valve. The adjustment of the dimension from the center of the turbine to the end of the mounting part of the turbine housing is to reduce the dimension compared to when the existing valve before the change was used, and as a result, the center of gravity of the main body of the rotary valve can be displaced toward the center of the turbine of the turbine generator more than when the existing valve was simply changed to a rotary valve. The adjustment of the dimension from the end of the upstream connection part of the main body of the rotary valve to the end of the downstream connection part, and the adjustment of the dimension in the extension direction of the tube member connected to the upstream connection part of the main body of the rotary valve to the opposite side to the turbine are additionally and supplementarily performed based on the result of the adjustment of the dimension from the center of the turbine to the end of the mounting part of the turbine housing so that the center of gravity of the main body of the rotary valve is displaced within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the hook of the main hoist. For example, in a rotary valve used as a general inlet valve, the tubular member is arranged between a downstream connection of the rotary valve body and a mounting part of the turbine housing, but the arrangement has been changed to connect the piping to the upstream connection of the rotary valve body. By changing the arrangement of the tubular member in this way, the center of gravity of the rotary valve body can be shifted toward the center of the turbine of the turbine generator, more so than in the case of simply changing from an existing valve to a general rotary valve.

[0012] In this way, when changing an inlet valve by replacing an existing valve (for example a sluice valve) with a rotary valve having larger external dimensions than the existing valve, the dimension from the center of the turbine to the end of the mounting part of the turbine housing, the dimension from the end of the upstream connection part of the rotary valve body to the end of the downstream connection part, and the dimension of the pipe member in the extension direction opposite the turbine are adjusted so that when the rotary valve is placed between the turbine and the piping, the end of the pipe member opposite the turbine and the end of the piping on the turbine side can abut, and the center of gravity of the rotary valve body is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the main hoist hook, so that the rotary valve body can be suspended by the main hoist while being positioned on the same vertical line as the center of gravity of the hook part of the main hoist.

[0013] In addition, the turbine side end of the piping is capable of abutting the end of the pipe member opposite the turbine, and the center of gravity of the rotary valve body is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the main hoist hook, so there is no need to cut the piping to adjust the dimensions to install the rotary valve.

[0014] The inlet valve installation structure of the invention described in claim 2 is characterized in that a portion of the wall surrounding at least the sides of the water turbine inside the building on the connection side with the downstream connection part of the inlet valve body is cut out. This makes it possible to ensure working space for attaching and detaching the attachment part of the water turbine casing and the downstream connection part of the connection part of the rotary valve body using fasteners such as bolts, even if the attachment part of the water turbine housing moves toward the center of the water turbine and approaches the wall part.

[0015] Furthermore, in the inlet valve installation structure of the invention described in claim 3, one side of a bypass pipe for eliminating a water pressure difference between the upstream side of the valve disc and the downstream side of the valve disc in the internal space of the housing of the main body of the rotary valve is attached to the casing of the main body of the rotary valve, the other side of the bypass pipe is attached to a mounting part of the housing of the hydraulic turbine, and a portion of a wall portion surrounding the side of the hydraulic turbine inside the building that overlaps with the path of the bypass pipe is cut out. As a result, even if a state in which the other side of the bypass pipe is attached to the mounting part of the housing of the hydraulic turbine and a state in which the mounting part of the housing of the hydraulic turbine is displaced toward the center of the hydraulic turbine and is brought close to the wall portion are combined, the mounting part of the mounting part of the housing of the hydraulic turbine is exposed to the outside by cutting out the wall portion, so that the bypass pipe can be reliably attached. Effect of the Invention

[0016] As described above, according to the inlet valve installation structure of the present invention, when changing an inlet valve by replacing an existing valve with a rotary valve having a larger outer dimension than the existing valve, the dimension from the center of the water turbine to the end of the mounting part of the water turbine housing, the dimension from the end of the upstream connection part of the rotary valve body to the end of the downstream connection part, and the dimension of the pipe member in the direction of extension away from the water turbine are adjusted so that when the rotary valve is placed between the water turbine and the piping, the end of the pipe member on the opposite side to the water turbine can abut against the end of the pipe member on the water turbine side, and the center of gravity of the rotary valve body is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the hook of the main hoist, so that the rotary valve body can be hoisted by the main hoist while being positioned on the same vertical line as the center of gravity of the hook part of the main hoist. Therefore, in order to lift the rotary valve, it is possible to directly hoist or lower the rotary valve body using the main hoist of the overhead crane already installed in the building. In addition, there is no need to modify or change the overhead crane.

[0017] In addition, according to the inlet valve installation structure of the present invention, the turbine side end of the piping is able to abut the end of the pipe opposite the turbine, and the center of gravity of the rotary valve body is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the main hoist hook.Therefore, there is no need to cut the piping to adjust the dimensions to position the rotary valve between the turbine and the piping, and it is possible to prevent the costs of installing the rotary valve from increasing.

[0018] In particular, according to the inlet valve installation structure of the invention described in claim 2, even if the mounting portion of the turbine housing becomes close to the wall due to displacement toward the center of the turbine, it is possible to secure working space for attaching and detaching the mounting portion of the turbine casing and the downstream connection portion of the connection portion of the rotary valve main body via a fastener such as a bolt.

[0019] In particular, according to the inlet valve installation structure of the invention described in claim 3, even if the other side of the bypass pipe is attached to the mounting portion of the turbine housing and the mounting portion of the turbine housing is displaced toward the center of the turbine so as to be close to the wall portion, the wall portion is cut out so that the mounting portion of the turbine housing and the mounting portion for the other side of the bypass pipe are exposed to the outside, so that the bypass pipe can be securely attached. [Brief description of the drawings]

[0020] [Figure 1] 1 is an explanatory diagram showing an outline of an example of an inlet valve installation structure to which the present invention is applied; [Diagram 2] 1 is a cross-sectional view of an inlet valve to which the present invention is applied, illustrating a state in which the valve disc faces upward and the valve is closed, and a state in which the valve disc faces sideways and the valve is open. FIG. [Diagram 3] FIG. 1 is a side view showing an example of an inlet valve installation structure to which the present invention is applied. [Figure 4] 1 is a plan view showing an example of an inlet valve installation structure to which the present invention is applied. FIG. [Diagram 5] FIG. 1 is a plan view showing a conventional inlet valve installation structure in which a rotary valve is simply installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] An example of a building 1 in which an inlet valve installation structure to which the present invention is applied is shown in Fig. 1. However, the building 1 shown in Fig. 1 is merely an outline, and for the convenience of explaining the inlet valve installation structure described below, certain parts of the actual building, such as a wall 12 surrounding a water turbine generator 6 described below, have been omitted or simplified.

[0023] An overhead crane 2 having a main hoist 3 and an auxiliary hoist 4 is installed on the ceiling 11 side of the building 1. In this embodiment, the overhead crane 2 is configured to have two standing sections 21, 22 and an erection section 23 erected between the standing sections 21, 22, and is capable of traveling along the longitudinal direction of platforms 24, 24 protruding from the wall of the building 1 on the upper surfaces (traveling tracks, etc.) of the platforms 24, 24 by means of wheels (not shown) or the like provided on the undersides of the standing sections 21, 22.

[0024] The hook portion 3a can move and move the load within the range R1 surrounded by the dashed line in FIG. 1 (however, for convenience, this range is shown without considering restrictions on movement due to obstacles. Hereinafter, this range will be referred to as the working range), which is determined by the range in which the main hoist 3 can move (transversely) along the longitudinal direction of the erection section 23 (part of which is shown as D1 in FIG. 3 and FIG. 5) and the range from the upper limit to the lower limit of the lifting height of the hook portion 3a. The range in the front-rear direction in which the main hoist 3 can move the load by traveling the overhead crane 2 is not shown. The movable limit point P1 on the inlet valve 8 side of the hook portion 3a of the main hoist 3, which is derived from the range D1 in which the main hoist 3 can move laterally, is shown in FIG. 3 and FIG. 5.

[0025] 1 (however, for convenience, this range is shown without consideration of restrictions on movement due to obstacles. Hereinafter, this range will be referred to as the working range.) The hook portion 4a can move and move the load within the range R2 surrounded by the two-dot chain line in FIG. 1, which is determined by the range in which the auxiliary hoist 4 can move (transversely) along the longitudinal direction of the erection section 23 and the range from the upper limit to the lower limit of the lifting height of the hook portion 4a. The range in the forward / rearward direction in which the auxiliary hoist 4 can move the load by the travel of the overhead crane 2 is not shown. Note that in this embodiment, the main hoist 3 is capable of lifting and lowering the body 9 of the inlet valve 8 described below, but the auxiliary hoist 4 is not necessarily capable of lifting and lowering the body 9 of the inlet valve 8.

[0026] A water turbine generator 6 is installed below the building 1. In this embodiment, the water turbine generator 6 is configured to include a generator 61 and a water turbine 62 arranged below the generator 61.

[0027] In this embodiment, a vertical-shaft Francis turbine is used as the water turbine 62, and the axis of the vertically extending main shaft 62a is a line (hereinafter, center line) P2 passing through the center of the water turbine 62. In this embodiment, the main shaft 62a and the like of the water turbine 62 are covered by a housing 63 located radially outside the main shaft 62a, and the wall portion 12 constituting the lower part of the building 1 is further arranged radially outside the housing 63, so that the water turbine 62 is surrounded by the wall portion 12. The housing 63 is connected to the inlet valve 8 by an attachment portion 63a. The attachment portion 63a includes both a portion fixed to the housing 63 as a separate member from the housing 63 and a portion integrated as a part of the housing 63. As shown in FIG. 3, the dimension from the center line P2 of the water turbine 62 to the end of the attachment portion 63a on the inlet valve 8 side is defined as L1.

[0028] 1, the inlet valve 8 is disposed between the mounting portion 63a of the housing 63 of the water turbine 62 and the penstock 7, which is an existing pipe located upstream of the water turbine 62, and serves to allow or stop the passage of water when sending water from the upstream side to the water turbine 62. The inlet valve 8 is composed of a main body 9 and a pipe member 10, as shown particularly in Figures 3 and 4.

[0029] As shown in FIG. 2, the main body 9 is composed of at least a casing 91 and a valve body 92, and as shown in FIG. 1, the main body 9 is disposed in a room 13 formed on the penstock 7 side of the hydraulic turbine generator 6 of the building 1, so as to be placed on a foundation 14. In FIG. 1, the upper part of the room 13 is shown open for the purpose of explaining the lifting and hanging of the main body 9 of the inlet valve 8. In this embodiment, the casing 91 is formed by combining a plurality of members 91a, 91b, and has an internal space S with openings H1, H2 communicating with the outside formed on both sides, and connection parts 93, 94 are provided on the periphery of the openings H1, H2. The connection part 93 can be connected to an end 101 of the pipe member 10 described below by a fastener 30 such as a bolt, and the connection part 94 can be connected to an attachment part 63a of the housing 63 of the hydraulic turbine 62 by a fastener 30 such as a bolt. The dimension from the end of connection portion 93 of casing 91 to the end of connection portion 94 is designated as L2.

[0030] The valve element 92 is a cylindrical body with openings on both sides, is housed in an internal space S formed in a casing 91, and rotates within a range of 90 degrees around an axis 95 to open the valve by opening H1 and H2 of the casing 91 in a horizontal or nearly horizontal state (horizontal state) as shown in Fig. 2, and closes the valve by closing the openings H1 and H2 of the casing 91 in a vertical or nearly vertical state (vertical state). In the present invention, the main body 9 of the inlet valve 8 in the assembled state shown in Fig. 2 is hung by the hook portion 3a of the main hoist 3 of the overhead crane 2.

[0031] 3 and 4, the inlet valve 8 has a bypass pipe 20 incorporating a valve (not shown) for eliminating the water pressure difference between the upstream side of the valve body 92 and the downstream side of the valve body 92 in the internal space S of the casing 91 of the main body 9. In the present invention, one end of the bypass pipe 20 is connected to the casing 91 of the main body 9, and the other end is connected to an attachment portion 63a in relation to the pipe member 10 described below. Further configuration of the bypass pipe 20 in relation to the present invention will be described later.

[0032] 3 and 4, in the present invention, the pipe member 10 is connected to the connection part 93 of the main body 9 of the inlet valve 8 via an end 101, and is connected to the end 71 of the penstock 7 via an end 102. The dimension from the end 101 of the pipe member 10 to the end 102, i.e., the dimension of the pipe member 10 in the extending direction opposite to the water turbine 62, is designated as L3.

[0033] In the inlet valve installation structure shown in Fig. 5, when changing from an existing valve such as a sluice valve to a rotary valve having a larger outside dimension than the valve, the existing rotary valve is used as it is as the main body 9 of the inlet valve 8, the arrangement of the tubular member 10 of the inlet valve 8 is also left as it is, and further, the dimension L1 from the center line P2 of the turbine 62 to the end of the mounting part 63a on the inlet valve 8 side, the dimension L2 from the end of the connecting part 93 of the casing 91 to the end of the connecting part 94, and the dimension L3 of the tubular member 10 in the extending direction opposite to the turbine 62 are not adjusted, so that the center of gravity G1 of the main body 9 of the inlet valve 8 is not within the working range R1 of the hook part 3a of the main winder 3, and is therefore located outside the movable limit point P1 of the main winder 3. Note that the inlet valve 8 shown in Fig. 5 is not significantly different in basic configuration from the inlet valve 8 described so far, except for the arrangement of the tubular member 10, and therefore, in order to avoid redundant explanation, the same reference numerals are used and the explanation is omitted.

[0034] In Fig. 5, the dimension L1 from the center line P2 of the water turbine 62 to the end of the mounting portion 63a on the inlet valve 8 side remains unchanged at, for example, 4,000 mm, whereas in Fig. 3, the dimension L1 is adjusted to be shorter, for example, 3,500 mm. This makes it possible to displace the installation position of the main body 9 of the inlet valve 8 toward the center line P2 of the water turbine 62 from the installation position in Fig. 5.

[0035] Next, in Fig. 5, the existing main body 9 of the inlet valve 8 is used as is, and the dimension L2 from the end of the connection part 93 of the casing 91 to the end of the connection part 94 is, for example, 2,500 mm, whereas in Fig. 3, the dimension L2 is adjusted to be shorter, such as 2,200 mm. In Fig. 5, the pipe member 10 is disposed between the attachment part 63a of the housing 63 and the connection part 94 of the main body 9, whereas in Fig. 3, the attachment part 63a of the housing 63 and the connection part 94 of the main body 9 are directly connected, and the pipe member 10 is disposed between the penstock 7 and the connection part 93 of the main body 9. As a result, since the pipe member 10 is no longer on the turbine 62 side, the installation position of the main body 9 of the inlet valve 8 can be displaced further toward the center line P2 of the turbine 62 than the installation position in Fig. 5.

[0036] 5, the other end of the bypass pipe 20 is connected to the pipe member 10. However, due to the change in the position of the pipe member 10 relative to the main body 9, the other end of the bypass pipe 20 is connected to the attachment portion 63a in FIGS. 3 and 4 as described above. As shown in FIG. 4, the bypass pipe 20 has neither one side connected to the main body 9 of the inlet valve 8 nor the other side connected to the attachment portion 63a positioned vertically above the center line of the main body 9 shown in FIG. 4. In other words, when a reference line is taken that extends vertically above the center line of the main body 9 as viewed from the opening H1 or H2 side of the main body 9, the bypass pipe 20 is inclined at an angle of, for example, 30 degrees with respect to the reference line and is offset in the left-right direction from the center line of the main body 9. This prevents the body 9 from interfering with a hatch (not shown) for closing the top of the room 13, even if the outer dimensions of the body 9 of the rotary valve used as the inlet valve 8 are larger than the outer dimensions of the body of the sluice valve.

[0037] Moreover, while the main body 9 of the inlet valve 8 is displaced toward the center line P2 of the turbine 62 as described above, the position of the end of the end 71 of the penstock 7 is fixed. The dimension L3 in the extension direction from the connection position of the connection part 93 of the main body 9 of the pipe member 10 to the opposite side to the turbine 62 is adjusted from 750 mm from the end of the end 101 to the end of the end 102 in Figure 5 to a longer dimension such as 800 mm, so that the penstock 7 and the connection part 93 of the main body 9 displaced toward the center line P2 of the turbine 62 can be more appropriately connected to the pipe member 10.

[0038] As a result, as shown in Figures 1 and 3, the center of gravity G1 of the main body 9 of the inlet valve 8 is within the range of the working range R1 of the hook portion 3a of the main winding 3, and therefore it is possible to position it closer to the center line P2 of the water turbine 62 than the limit of movement P1 of the main winding 3. Therefore, the center of gravity G1 of the main body 9 of the inlet valve 8 and the center of gravity G2 of the main winding 3 can be made to coincide with a vertical line as shown in Figure 3, so that it is possible to hoist the main body 9 of the inlet valve 8 in a stable state by the main winding 3 and lift it up as shown in Figure 1. Note that, as shown in Figures 1 and 3, the pipe member 10 is out of the range of the working range R1 of the hook portion 3a of the main winding 3, and therefore it is located on the opposite side of the center line P2 of the water turbine 62 than the limit of movement P1 of the main winding 3, but as shown in Figure 1, it is within the working range R2 of the hook portion 4a of the auxiliary winding 4, and its weight is not as large as that of the main body 9, so it is possible to hoist the main body 9 of the inlet valve 8 in a stable state by the auxiliary winding 4 and lift it up.

[0039] On the other hand, as the dimension L1 from the center line P2 of the water turbine 62 to the end of the mounting part 63a of the housing 63 of the water turbine 62 is shortened, the mounting part 63a of the housing 63 is displaced toward the center line P2 of the water turbine 62 and comes close to the wall part 12 that covers the lateral periphery of the water turbine 62, but as shown in Fig. 3, a notch 15 is formed in the part of the wall part 12 on the center line P2 side of the mounting part 63a of the water turbine 62. This makes it possible to secure a working space for attaching and detaching the mounting part 63a of the housing 63 of the water turbine 62 and the connection part 94 of the body 9 of the inlet valve 8 via a fastener 30 such as a bolt.

[0040] Even when both a state in which the other end of the bypass pipe 20 is attached to the attachment portion 63a of the housing 63 of the water turbine 62 and a state in which the attachment portion 63a of the housing 63 is displaced toward the center line P2 of the water turbine 62 and is close to the wall portion 12 that covers the lateral periphery of the water turbine 62, as shown in Fig. 4, a notch 16 is formed in a portion of the wall portion 12 that overlaps with the path of the bypass pipe 20. As a result, the attachment portion of the attachment portion 63a of the housing 63 of the water turbine 62 to the other end of the bypass pipe 20 is exposed to the outside, so that the bypass pipe 20 can be reliably attached to the attachment portion 63a. [Explanation of symbols]

[0041] 1. Building 11. Ceiling 12 Wall 15 Cutout 16 Cutout 2. Overhead crane 3 Main Volume 3a Hook part 4 Supplementary Volume 6. Water Turbine Generator 62 Waterwheel 63 Housing 63a Mounting part 7. Penstock (piping) 71 End 8 Inlet valve 9 Inlet valve body 91 Casing 92 Valve body 93 Connection (Upstream Connection) 94 Connection (downstream connection) 10 Pipe members P2 Turbine centerline (center of turbine) S Internal space of the casing of the inlet valve body R1 Working range of the main hoist hook (range determined by the movement of the main hoist of the overhead crane and the lifting height of the main hoist hook) L1 Dimension from the center of the turbine to the edge of the turbine housing mounting L2 Dimension from the upstream connection end of the inlet valve body to the downstream connection end L3 Dimension of the pipe member extending in the direction opposite to the turbine G1 Center of gravity of inlet valve body

Claims

1. An inlet valve installation structure for changing an inlet valve to be installed between a water turbine of a water turbine generator and an existing pipe located upstream of the water turbine in a building where an overhead crane having a main hoist and an auxiliary hoist is installed, from an existing valve to a valve having an outer dimension larger than that of the existing valve, As a valve to be replaced from the existing valve, a rotary valve is used, which has at least a main body having a casing in an internal space in which a valve body is accommodated and connection parts are provided on the upstream side and downstream side of the casing, and a pipe member connectable to the connection parts of the main body, The water turbine has a housing provided with an attachment portion for connecting to a downstream connection portion of the main body of the rotary valve, the existing piping has a turbine-side end that can abut against an end of an upstream connection portion of a main body of the rotary valve, and the end of the turbine-side end of the existing piping is left in a position where the existing valve was installed between the end and a mounting portion of a housing of the turbine; a dimension from a center line of the water turbine to an end of a mounting portion of the water turbine housing is made smaller than when the existing valve was installed, and a dimension from an end of an upstream connection portion of the main body of the rotary valve to an end of a downstream connection portion is adjusted to displace the center of gravity of the main body of the rotary valve closer to the center line of the water turbine than when the main body of the rotary valve is installed in the same position as the existing valve; The downstream connection portion of the rotary valve body is directly connected to the mounting portion of the housing, The center of gravity of the main body of the rotary valve is within a range determined by the movement of the main hoist of the overhead crane and the lifting height of the hook of the main hoist, The inlet valve installation structure is further characterized in that the pipe member is arranged between the upstream connection portion of the main body of the rotary valve and the existing piping, and with the turbine side end of the pipe member connected to the upstream connection portion of the main body of the rotary valve, the end of the pipe member opposite the turbine is capable of abutting the turbine side end of the existing piping.

2. An inlet valve installation structure as described in claim 1, characterized in that a portion of the wall surrounding at least the side of the water turbine inside the building on the connection side with the downstream connection portion of the main body of the inlet valve is cut out.

3. a bypass pipe for eliminating a water pressure difference between the upstream side of the valve body and the downstream side of the valve body in an internal space of a housing of the main body of the rotary valve, one side of which is attached to a casing of the main body of the rotary valve, and the other side of which is attached to a mounting portion of the housing of the water turbine; 3. The inlet valve installation structure according to claim 1, wherein a portion of a wall portion surrounding a side of the water turbine inside the building that overlaps with a path of the bypass pipe is cut out.

Images