A large energy storage pump with a cylindrical valve

Abstract

The invention discloses a large energy storage pump provided with a cylindrical valve, belonging to the technical field of large water pumps and energy storage pumps, comprising an energy storage pump body, wherein the energy storage pump body comprises a top cover, a base and a fixed guide vane, wherein a runner chamber is arranged in the base, a runner is arranged in the runner chamber and external water flows into the runner chamber through the fixed guide vane, and further comprises a seat ring upper ring plate and a seat ring lower ring plate respectively mounted on the top cover and the base, wherein a connecting cavity is formed by the seat ring upper ring plate, the seat ring lower ring plate, the top cover and the runner chamber; a cylindrical valve is mounted on the seat ring upper ring plate, the cylindrical valve is arranged between the fixed guide vane and the runner, and the cylindrical valve is equipped with a plurality of cylindrical valve servomotors which synchronously drive the opening and closing of the cylindrical valve, and the connecting cavity is sealed or connected with the external water flow through the opening and closing of the cylindrical valve, so as to achieve the purpose of greatly reducing the radial size of the unit, saving the unit manufacturing cost, the plant construction cost and reducing the investment in the pump station.

Description

Technical Field

[0001] The invention belongs to the technical field of large water pumps and energy storage pumps, and in particular relates to a large energy storage pump provided with a cylindrical valve. Background Art

[0002] Generally, small water pumps can be started directly in water without water pressure; when shutting down, the water flow is usually cut off by the outlet gate or outlet valve. However, due to the large capacity of large energy storage pumps, if they are started directly with water, the starting torque will be very huge and it is likely that it cannot be achieved. Therefore, the water pressure starting method of the pump turbine of the pump-storage power station can be used for reference. If the air-filled water pressure starting method is used, the movable guide vane or valve must be used to form a water pressure closed cavity to achieve the purpose of starting the energy storage pump.

[0003] In view of the problem of starting and stopping large energy storage pumps, a better feasible solution should be proposed. Generally speaking, large energy storage pump units can be equipped with or without movable guide vanes; energy storage pumps equipped with movable guide vanes can use the opening and closing of movable guide vanes to achieve start and stop; if movable guide vanes are not set, the start and stop of large energy storage pumps need to use water inlet valves or set valves on the energy storage pump units. The start and stop of large energy storage pump units without movable guide vanes should mainly meet the following requirements: (1) Use the valve, top cover, seat ring and runner chamber to form a closed cavity so that compressed air can be filled in the closed cavity to achieve water pressure start; (2) The valve opening time should meet the requirements of the unit's rapid start time; (3) When the unit is shut down normally or in an emergency, the valve can be quickly closed according to the required closing time; (4) The valve relay and its control equipment should achieve synchronous operation.

[0004] Therefore, in order to solve the problem of starting and stopping a large energy storage pump without movable guide vanes (including phase-adjusted water pressure start-up, normal shutdown, and emergency shutdown of the pump due to power failure, etc.), it is necessary to reasonably design the overall structural scheme of the large energy storage pump unit. At present, the main disadvantages of other existing schemes are as follows:

[0005] (1) If a large energy storage pump adopts the scheme of setting movable guide vanes, it is necessary to add movable guide vane operating mechanism and its auxiliary equipment. At the same time, due to the arrangement requirements of the movable guide vane distribution circle, the radial size of the unit will inevitably increase. Therefore, the manufacturing cost of the unit will increase significantly.

[0006] (2) If a large energy storage pump is used without movable guide vanes and with a water outlet valve behind the water pressure chamber, since the valve is arranged behind the water pressure chamber and forms a closed cavity with the runner chamber after the valve is closed, the volume of the air-filled water will be larger. Although the radial dimension of the unit itself will be smaller, the arrangement of the water outlet valve is increased, which not only increases the manufacturing cost of the valve itself, but also requires the installation of a valve chamber, and the civil engineering cost of the plant will also increase significantly.

[0007] From the above analysis, it can be seen that the existing technical solutions all have certain shortcomings. Therefore, it is an inevitable trend to propose a technical solution with compact layout, reasonable design, low cost and the ability to meet the operation requirements of the energy storage pump. Summary of the invention

[0008] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a large energy storage pump equipped with a cylindrical valve so as to significantly reduce the radial size of the unit, save the manufacturing cost of the unit, the civil construction cost of the plant, and reduce the investment in the pump station.

[0009] The technical solution adopted by the present invention is: a large-scale energy storage pump with a cylindrical valve, comprising an energy storage pump body, the energy storage pump body comprising a top cover, a base and a fixed guide vane, a runner chamber is arranged in the base, a runner is arranged in the runner chamber and external water flows into the runner chamber through the fixed guide vane, and also comprises a seat ring upper ring plate and a seat ring lower ring plate respectively mounted on the top cover and the base, and a connecting cavity is formed by the seat ring upper ring plate, the seat ring lower ring plate, the top cover and the runner chamber; a cylindrical valve is installed on the seat ring upper ring plate, the cylindrical valve is arranged between the fixed guide vane and the runner, and the cylindrical valve is equipped with a plurality of cylindrical valve relays that synchronously drive the opening and closing of the cylindrical valve, and the connecting cavity is sealed or connected with the external water flow through the opening and closing of the cylindrical valve.

[0010] Furthermore, it also includes a metal volute, which is assembled and connected to the seat ring upper ring plate and the seat ring lower ring plate, and the metal volute is used to efficiently drain the external water flow.

[0011] Furthermore, the cylindrical valve comprises a cylindrical valve body, which is sealingly and slidably assembled on the upper ring plate of the seat ring, and a lower sealing gasket corresponding to the cylindrical valve body is installed on the lower ring plate of the seat ring to improve the sealing performance of the cylindrical valve in the closed state.

[0012] Furthermore, the cylindrical valve body is provided with an annular outer edge, and an upper sealing gasket matching the annular outer edge is provided on the upper ring plate of the seat ring, thereby improving the sealing performance of the cylindrical valve in a closed state.

[0013] Furthermore, the cylindrical valve body is close to the high-pressure side of the runner to further reduce the volume of the air-pressurized water, making its operation more stable and reliable.

[0014] Furthermore, it also includes a tailwater pipe, which is sealed and connected to the runner chamber. A suitable scale is set on the tailwater pipe so that the energy storage water pump can be started when the air is inflated and the water is pressed to the scale.

[0015] Furthermore, the cylindrical valve servomotors are provided in 3-6 pieces, and each cylindrical valve servomotor is started synchronously to drive the cylindrical valve body to move and switch the state of the cylindrical valve.

[0016] The beneficial effects of the present invention are:

[0017] 1. The large energy storage pump provided with a cylindrical valve provided by the present invention is used, and the cylindrical valve is quickly opened and closed according to the specified opening and closing time to meet the start and stop requirements of the energy storage pump unit. Compared with the solution of setting movable guide vanes, there is no need to set a movable guide vane operating mechanism and its auxiliary equipment. Moreover, since the movable guide vanes are cancelled, the radial size of the energy storage pump unit will inevitably be greatly reduced. Therefore, the manufacturing cost of the unit will be greatly reduced.

[0018] 2. The large energy storage pump provided by the present invention is provided with a cylindrical valve, and the cylindrical valve is set between the fixed guide vane and the runner, and close to the high-pressure side of the runner. Therefore, after the cylindrical valve is closed, the volume of the air-filled and pressurized water in the closed cavity formed with the runner chamber will be relatively small, and the manufacturing cost of the outlet valve is reduced. There is no need to set up a special valve chamber, and the civil construction cost of the plant will be greatly reduced, compared with the prior art that sets up a pressurized water chamber. The opening and closing time of the outlet valve is difficult to meet the requirements of rapid opening and closing. If the rapid start and stop requirements of the energy storage pump unit are to be met, additional further research and related equipment investment are required.

[0019] 3. The large energy storage pump provided by the present invention and provided with a cylindrical valve has a smaller volume of air-filled and pressurized water, so the time for pressure-building and starting is also shorter, so the specifications of the compressed air equipment will also be smaller, and its operation will be more stable and reliable; compared with the use of water outlet valves, especially butterfly valves, in the prior art, when air-filled and pressurized water is quickly closed, a greater disturbance will be caused to the water body in the flow channel, which may produce harmful vibrations, and even when air-filled and pressurized water is pressed, due to sealing, vibration and other reasons, the closed cavity leaks or a water ring is not formed, resulting in unsuccessful pressure-building and further startup failure. Therefore, the operation of the large energy storage pump unit of the present invention will be safer and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a large energy storage pump provided with a cylindrical valve provided by the present invention;

[0021] Figure 2 It is a partial structural schematic diagram of a large energy storage pump provided with a cylindrical valve provided by the present invention, in which the cylindrical valve is in a closed state;

[0022] Figure 3 It is a partial structural schematic diagram of a large energy storage pump provided with a cylindrical valve provided by the present invention, in which the cylindrical valve is in an open state;

[0023] Figure 4 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0024] Figure 5 yes Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0025] The following are marked in the attached figure:

[0026] 1-runner chamber, 2-top cover, 3-base, 4-main shaft, 5-runner, 6-seat ring upper ring plate, 7-seat ring lower ring plate, 8-metal volute, 9-cylindrical valve servomotor, 10-tailwater pipe, 11-cylindrical valve body, 12-upper sealing gasket, 13-lower sealing gasket. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Example 1

[0034] In the present embodiment, a large energy storage pump provided with a cylindrical valve is disclosed, including an energy storage pump body, wherein the energy storage pump body includes a top cover 2, a base 3 and a fixed guide vane, wherein the top cover 2 is assembled and connected with the main shaft 4, and the top cover 2 corresponds to the base 3, and a runner chamber 1 is formed between the base 3 and the top cover 2, and a runner 5 running in the runner chamber 1 is assembled on the main shaft 4, and the external water flows into the runner chamber 1 through the fixed guide vane, and the runner 5 is rotated under the drive of the hydraulic force, and then the rotor of the generator is driven to rotate through the main shaft 4 to generate electricity. The above is the working principle and partial component structure of the existing large energy storage pump, which belongs to the prior art and will not be repeated here.

[0035] like Figure 1 As shown, it also includes a seat ring upper ring plate 6 and a seat ring lower ring plate 7 which are respectively assembled on the top cover 2 and the base 3, and a water inlet channel is formed between the seat ring upper ring plate 6 and the seat ring lower ring plate 7. External water flows into the runner chamber 1 through the water inlet channel, and a connecting cavity is formed by the seat ring upper ring plate 6, the seat ring lower ring plate 7, the top cover 2 and the runner chamber 1. The water inlet channel is a part of the connecting cavity. The seat ring upper ring plate 6 is assembled and connected to the top cover 2, and the inner hole wall thereof is sealed and connected to the outer wall of the top cover 2; the seat ring lower ring plate 7 is assembled and connected to the base 3, and the inner hole wall thereof is sealed and connected to the outer wall of the base 3 to form the entire connecting cavity.

[0036] A cylindrical valve is installed on the ring plate 6 on the seat ring. The cylindrical valve is arranged between the fixed guide vane and the runner 5 and is equipped with a plurality of cylindrical valve servomotors 9 for synchronously driving the opening and closing thereof. Each of the cylindrical valve servomotors 9 is assembled and connected to the top cover 2, and each of the cylindrical valve servomotors 9 can move synchronously to realize the normal opening and closing of the cylindrical valve. In the present embodiment, preferably, 3-6 cylindrical valve servomotors 9 are equipped, and each cylindrical valve servomotor 9 is assembled and connected to the top cover 2. The connecting cavity is isolated or connected with the external water flow by opening and closing the cylindrical valve. When the cylindrical valve is in the open state, the external water flow can flow into the runner chamber 1 normally, and the energy storage pump unit can operate normally at this time. On the contrary, when the cylindrical valve is in the closed state, the runner chamber 1 is isolated from the external water flow, thereby realizing the shutdown of the water pump. At the same time, since the inlet end of the connecting cavity is closed and a sealed cavity is formed, the sealed cavity is inflated with air and water, that is, compressed air is filled into the closed cavity, thereby realizing the pressurized water start of the large energy storage pump. Since the volume of the inflated and pressurized water is small, the time for pressure creation and start-up is also shorter, so the specifications of the compressed air equipment will also be smaller, and its operation will be more stable and reliable.

[0037] It also includes a metal volute 8, which is assembled and connected to the seat ring upper ring plate 6 and the seat ring lower ring plate 7. The metal volute 8 is set to a snail shell shape, which can play a good drainage role for the external water flow to meet the needs of the energy storage water pump to operate normally and generate electricity.

[0038] like Figure 4 , Figure 5 As shown, the cylindrical valve comprises a cylindrical valve body 11, which is sealingly and slidingly assembled on the seat ring upper ring plate 6, and the seat ring lower ring plate 7 is provided with a lower sealing gasket 13 corresponding to the cylindrical valve body 11, and the cylindrical valve body 11 is provided with an annular outer edge, and the seat ring upper ring plate 6 is provided with an upper sealing gasket 12 matching the annular shape. Figure 3 As shown in the figure, when the cylindrical valve is in the open state, the cylindrical valve body 11 rises to the highest position and the bottom end surface of the cylindrical valve body 11 is flush with the bottom end surface of the top cover 2, so that water flows smoothly through the flow channel. At the same time, a cavity for accommodating the cylindrical valve body 11 is provided between the top cover 2 and the ring plate 6 on the seat ring, and the cylindrical valve body 11 can slide freely in the cavity to realize the opening and closing of the cylindrical valve; Figure 2 As shown, when the cylindrical valve is in a closed state, the cylindrical valve body 11 drops to the lowest position and the bottom end face of the cylindrical valve body 11 presses against the lower sealing gasket 13 and seals. At the same time, the outer edge of the cylindrical valve body 11 presses against the upper sealing gasket 12 and seals, so as to seal the connecting cavity to form a closed cavity.

[0039] like Figure 5As shown, in order to ensure good sealing between the cylindrical valve body 11 and the lower ring plate 7 of the seat ring, the end of the cylindrical valve body 11 facing the lower ring plate 7 of the seat ring is set as an inclined end face to ensure that when the cylindrical valve is in a closed state, the cylindrical valve body 11 can be completely pressed against the lower sealing gasket 13 to achieve a good sealing effect.

[0040] In order to further reduce the volume of the inflated and pressurized water, the cylindrical valve body 11 is placed close to the high-pressure side of the runner 5. When the cylindrical valve body 11 seals the connecting cavity, the formed sealed cavity is relatively smaller, so that the volume of the inflated and pressurized water will be relatively smaller, and the pressure-generating start-up time will be shorter. The specifications of the compressed air equipment will also be smaller, and its operation will be more stable and reliable.

[0041] like Figure 1 As shown, it also includes a tailwater pipe 10, which is sealed with the runner chamber 1. During the process of inflation and water pressure, when the water level drops to an appropriate scale position of the tailwater pipe 10, the energy storage water pump can be started.

[0042] In this embodiment, the cylindrical valve can be opened and closed quickly according to the specified opening and closing time when the cylindrical valve relays 9 are operated synchronously to meet the start and stop requirements of the energy storage pump unit. Generally speaking, when the energy storage pump unit is started, the opening time of the cylindrical valve needs to meet the start time requirement of the energy storage pump unit (about 10 to 30 seconds); when the energy storage pump unit is shut down normally or in an emergency, the cylindrical valve can be adjusted according to the energy storage pump unit to ensure the calculated closing time (about 0 to 30 seconds) and quickly closed.

[0043] The working principle of the large energy storage pump provided with a cylindrical valve provided in this embodiment is as follows:

[0044] Synchronously start each cylindrical valve servo 9, which causes the cylindrical valve to open, so that the external water flows smoothly through the flow channel and enters the runner chamber 1, and drives the runner 5 to rotate under the action of hydraulic force;

[0045] Synchronously start each cylindrical valve servomotor 9, the cylindrical valve servomotor 9 forces the cylindrical valve to close, and the cylindrical valve body 11 and the seat ring upper ring plate 6 and the seat ring lower ring plate 7 are all sealed and assembled to cut off the external water flow, thereby realizing the water pump shutdown;

[0046] For large energy storage pump units without movable guide vanes, the start and stop requirements of the energy storage pump unit are realized by opening and closing the cylindrical valve set at the top cover 2, which not only fully utilizes the advantages of the opening and closing synchronization and movable water closure of the cylindrical valve, but also greatly reduces the radial size compared with the energy storage pump unit with movable guide vanes, cancels the guide vane operating mechanism and its corresponding auxiliary equipment, and saves the manufacturing cost of the unit. At the same time, it fully considers and meets the start and stop requirements of large energy storage pumps, with a compact layout and reasonable design.

[0047] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A large energy storage pump with a cylindrical valve, comprising an energy storage pump body, the energy storage pump body comprising a top cover, a base and a fixed guide vane, a runner chamber is arranged in the base, a runner is arranged in the runner chamber and external water flows into the runner chamber through the fixed guide vane, characterized in that: The invention also includes a seat ring upper ring plate and a seat ring lower ring plate respectively mounted on the top cover and the base, and a connecting cavity is formed by the seat ring upper ring plate, the seat ring lower ring plate, the top cover and the runner chamber; a cylindrical valve is mounted on the seat ring upper ring plate, the cylindrical valve is arranged between the fixed guide vane and the runner, and the cylindrical valve is equipped with a plurality of cylindrical valve servomotors that synchronously drive the opening and closing of the cylindrical valve, and the connecting cavity is isolated or connected with the external water flow through the opening and closing of the cylindrical valve; and a metal volute is also included, and the metal volute is assembled and connected to the seat ring upper ring plate ... plate and the lower ring plate of the seat ring; the cylindrical valve includes a cylindrical valve body, the cylindrical valve body is sealingly and slidably assembled on the upper ring plate of the seat ring, and the lower ring plate of the seat ring is provided with a lower sealing gasket corresponding to the cylindrical valve body; the cylindrical valve body is provided with an annular outer edge, and the upper ring plate of the seat ring is provided with an upper sealing gasket matching the annular outer edge; the cylindrical valve body is close to the high-pressure side of the runner; it also includes a tailwater pipe, which is sealingly connected to the runner chamber; the cylindrical valve servomotor is equipped with 3-6 pieces.

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