A buffer steady flow device applied to a steam turbine water injection air extraction system

Abstract

The application relates to the field of steam turbine power generation and discloses a buffer flow stabilizing device applied to a water jet air extraction system of a steam turbine, which comprises a bottom plate and further comprises: a buffer unit arranged in the interior of a water jet tank and connected with a water jet air extractor; the buffer unit comprises: a first buffer device arranged in the interior of a mounting tank; a second buffer device arranged in the interior of the mounting tank and located below the first buffer device; a transmission device arranged between the first buffer device and the second buffer device and used for transmitting kinetic energy of the first buffer device; and a third buffer device arranged at the lower part of the mounting tank. The water jet air extractor is subjected to the buffering of water jet flow impact force for multiple times, the flow speed of water flow brought into the interior of the water jet tank by the water jet air extractor is slowed down, the influence of high-speed water flow on the output of a water pump is reduced, the design volume of the water jet tank is reduced, and compared with a traditional water jet tank, the cleaning and maintenance difficulty of the water jet tank is reduced.

Description

Technical Field

[0001] This invention relates to the field of steam turbine power generation technology, specifically to a buffer flow stabilization device applied to a steam turbine water jet extraction system. Background Technology

[0002] The water jet tank is an important component of a steam turbine power generation system. The water jet pump in the system pumps industrial water from the water jet tank into the system's water jet ejector through the pump's suction port. Powered by the pump's pumping force, the ejector draws non-condensable gases from the condenser and discharges the mixture, carrying the non-condensable gases, into the water jet tank through the steam-water mixture discharge port.

[0003] The existing equipment has the following disadvantages: the distance between the water jet exhaust outlet of the small water jet tank and the water jet pump inlet is relatively close. The 15kg / h air carried by the water jet exhaust outlet will impact the water surface in the water jet tank at high speed with the water flow, causing air to mix into the water tank and even the water jet pump inlet, affecting the normal operation of the water jet pump. Conventional water jet exhausters are designed to be relatively long, and the water tank depth cannot be further increased. Adding a baffle inside the water jet tank to allow water to overflow to the pump inlet will increase the volume of the water jet tank and increase the space occupied by the equipment. The other side of the baffle is difficult to clean.

[0004] Therefore, this application proposes a buffer flow stabilizing device for use in steam turbine water jet extraction systems to solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a buffer flow stabilizing device for a steam turbine water jet air extraction system, in order to solve the problem that the 15kg / h air entrained by the water jet at the outlet of the water jet air extractor will impact the water surface inside the water jet tank at high speed with the water flow, causing air to mix into the water tank and even the inlet of the water jet pump, thus affecting the normal operation of the water jet pump.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a buffer flow stabilizing device for a steam turbine water jet ejection system, comprising a base plate, a water jet tank disposed on the base plate, a water jet ejector disposed on the upper part of the water jet tank, a water pipe disposed on one side of the water jet tank, and a water pump disposed on one side of the water pipe and disposed on the upper part of the base plate, wherein the water pump is connected to the water jet ejector through the water pipe to form a circulation system, and further comprising:

[0007] A buffer unit is installed inside the water jet tank and connected to the water jet air pump, used to buffer the water flow ejected by the water jet air pump.

[0008] The buffer unit includes:

[0009] The mounting box is installed on the inner wall of the water jet tank to restrict the flow direction of the water jet ejector.

[0010] The first buffer device is installed inside the mounting box to provide initial buffering for the water flow ejected by the water jet pump.

[0011] The second buffer device is located inside the mounting box and below the first buffer device, and is used to further buffer the water flow ejected by the water jet pump.

[0012] A transmission device is disposed between the first buffer device and the second buffer device for transmitting the kinetic energy of the first buffer device;

[0013] A third buffer device is located at the bottom of the mounting box to further buffer the water flow ejected by the water jet pump.

[0014] The first buffer device includes a fixed base at the bottom of the mounting box, a rotating shaft on the fixed base, and a rotating component on the upper part of the rotating shaft. The rotating component is located at the water inlet at the upper part of the mounting box.

[0015] The rotating component includes a connecting block disposed on the upper part of the rotating shaft, a buffer plate disposed on the upper part of the connecting block, and a first impeller disposed at intervals on the buffer plate, wherein the buffer plate is located directly below the water inlet of the mounting box.

[0016] The upper part of the buffer plate is tapered.

[0017] The transmission device includes a mounting bracket sleeved on the rotating shaft, a connecting shaft set at an equal angle at the lower part of the mounting bracket, a first gear sleeved on the connecting shaft, and a gear ring set on the inner wall of the mounting box, wherein the first gear is threadedly connected to the gear ring.

[0018] The second buffer device includes a second gear threadedly connected to the first gear, a collar disposed inside the second gear, and a second impeller disposed on the collar, the collar being sleeved on the rotating shaft.

[0019] The third buffer device includes a guide rod that is set at an equal angle at the lower part of the mounting box, a buffer net sleeved on the guide rod, and a limiting plate set at the lower part of the guide rod. The buffer net is located below the mounting box.

[0020] The guide rod is fitted with an elastic element between the buffer net and the limiting plate.

[0021] The mounting box is equipped with a fixing plate, which is connected to the inner wall of the water jet tank by fixing bolts.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention's water jet ejector injects gas and water into the water jet tank. The high-speed water jet then contacts a first buffer device, causing it to rotate and buffer some of the water jet's impact. The rotation of the first buffer device drives a transmission device, which in turn drives a second buffer device to rotate in the opposite direction. This creates a reaction force with the high-speed rotating water jet, further buffering its impact. The water then flows out from the bottom of the mounting box and contacts a third buffer device, where it is further buffered before flowing into the water jet tank. Through multiple buffering processes of the water jet ejector's impact, the flow rate of the water entering the tank is reduced, thus mitigating the impact of high-velocity water on the pump's output. This also reduces the size of the water jet tank and simplifies cleaning and maintenance compared to traditional water jet tanks. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure in one embodiment of the present invention;

[0025] Figure 2 This is a side view of the structure in one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the water tank in one embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional structural schematic diagram of a buffer unit in one embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a buffer unit explosion in one embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional structural schematic diagram of the mounting box in one embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the installation structure of the first buffer device in one embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the installation structure of the second buffer device and the transmission device in one embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the system structure in one embodiment of the present invention.

[0033] In the diagram: 1. Water jet tank; 2. Water jet air ejector; 3. Water pipe; 4. Water pump; 5. Base plate; 6. Buffer unit; 61. Mounting box; 62. Fixing plate; 63. Fixing bolt; 64. First buffer device; 641. Buffer plate; 642. Connecting block; 643. First impeller; 65. Rotating shaft; 66. Transmission device; 661. Mounting bracket; 662. Connecting shaft; 663. First gear; 67. Gear ring; 68. Second buffer device; 681. Second gear; 682. Collar; 683. Second impeller; 69. Third buffer device; 691. Buffer net; 692. Guide rod; 693. Limiting plate; 694. Elastic element; 610. Fixing seat. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-9 This invention provides a technical solution: a buffer flow stabilizing device for a steam turbine water jet ejection system, comprising a base plate 5, a water jet tank 1 mounted on the base plate 5, a water jet ejector 2 mounted on the upper part of the water jet tank 1, a water pipe 3 mounted on one side of the water jet tank 1, and a water pump 4 mounted on one side of the water pipe 3 and mounted on the upper part of the base plate 5. The water pump 4 is connected to the water jet ejector 2 through the water pipe 3 to form a circulation system, and further comprising:

[0036] The buffer unit 6 is located inside the water jet tank 1 and connected to the water jet air pump 2, and is used to buffer the water flow ejected by the water jet air pump 2.

[0037] Buffer unit 6 includes:

[0038] Mounting box 61 is installed on the inner wall of water jet tank 1 to restrict the flow direction of water jet ejector 2.

[0039] The first buffer device 64 is installed inside the mounting box 61 and is used to initially buffer the water flow ejected by the water jet ejector 2.

[0040] The second buffer device 68 is disposed inside the mounting box 61 and below the first buffer device 64, and is used to further buffer the water flow ejected by the water jet ejector 2.

[0041] The transmission device 66 is disposed between the first buffer device 64 and the second buffer device 68, and is used to transmit the kinetic energy of the first buffer device 64.

[0042] The third buffer device 69 is located at the bottom of the mounting box 61 and is used to further buffer the water flow ejected by the water jet ejector 2.

[0043] It should be noted that during operation, the water jet ejector 2 injects gas and water into the water jet tank 1. The gas then comes into contact with the first buffer device 64 via a high-speed, impacting water stream, causing the first buffer device 64 to rotate. This buffers some of the water flow's impact. The rotation of the first buffer device 64 drives the transmission device 66 to rotate, which in turn drives the second buffer device 68 to rotate in the opposite direction to the first buffer device 64. This creates a reaction force with the high-speed rotating water flow, further buffering the water flow's impact. The impact of the water flow is further buffered, and then the water flows out from the bottom of the mounting box 61 and comes into contact with the third buffer device 69. After being further buffered by the third buffer device 69, it flows into the interior of the water jet tank 1. After multiple buffering of the impact force of the water jet from the water jet air ejector 2, the flow rate of the water jet brought into the interior of the water jet tank 1 by the water jet air ejector 2 is reduced, thereby reducing the impact of the high flow rate water jet on the output of the water pump 4, reducing the design volume of the water jet tank 1, and reducing the difficulty of cleaning and maintaining the water jet tank 1 compared with the traditional water jet tank 1.

[0044] In one embodiment, the first buffer device 64 includes a fixed base 610 disposed at the bottom of the mounting box 61, a rotating shaft 65 disposed on the fixed base 610, and a rotating component disposed on the upper part of the rotating shaft 65, the rotating component being located at the water inlet at the upper part of the mounting box 61.

[0045] With this design, high-velocity water flows into the upper part of the rotating component, causing the rotating component to rotate on the upper part of the rotating shaft 65. This can absorb and buffer the impact force of the high-velocity water. The mounting box 61 can restrict the flow direction of the water pumped in by the water jet air pump 2, so that the water flows inside the mounting box 61.

[0046] In one embodiment, the rotating component includes a connecting block 642 disposed on the upper part of the rotating shaft 65, a buffer plate 641 disposed on the upper part of the connecting block 642, and a first impeller 643 spaced apart on the buffer plate 641, the buffer plate 641 being located directly below the water inlet of the mounting box 61.

[0047] With this design, high-velocity water flows out from the inlet of the mounting box 61, and after contacting the buffer plate 641, the water flow is dispersed into the first impeller 643, which then drives the first impeller 643 to rotate, causing the first impeller 643 to drive the rotating shaft 65 to rotate. During the rotation, the first impeller 643 buffers the impact force of the high-velocity water.

[0048] In one embodiment, the upper part of the buffer plate 641 is tapered.

[0049] With this design, the buffer plate 641 is made of a high-strength stainless steel cone. After being impacted by high-velocity water, it can evenly distribute the flow velocity of the water onto the first impeller 643, and evenly buffer the impact force of the high-velocity water.

[0050] In one embodiment, the transmission device 66 includes a mounting bracket 661 sleeved on the rotating shaft 65, a connecting shaft 662 equally angled at the lower part of the mounting bracket 661, a first gear 663 sleeved on the connecting shaft 662, and a gear ring 67 disposed on the inner wall of the mounting box 61, wherein the first gear 663 is threadedly connected to the gear ring 67.

[0051] With this design, the mounting bracket 661 is fixed on the rotating shaft 65. During the rotation of the rotating shaft 65, the mounting bracket 661 is driven to rotate, which causes the connecting shaft 662 to drive the first gear 663 to rotate. The first gear 663 meshes with the gear ring 67, driving the first gear 663 to rotate.

[0052] In one embodiment, the second buffer device 68 includes a second gear 681 threadedly connected to the first gear 663, a collar 682 disposed inside the second gear 681, and a second impeller 683 disposed on the collar 682, the collar 682 being sleeved on the rotating shaft 65.

[0053] With this design, the first gear 663 meshes with the second gear 681, so that the first gear 663 drives the second gear 681 to rotate in the opposite direction during the rotation of the first gear 663. This allows the collar 682 to drive the second impeller 683 to rotate in the opposite direction to the first impeller 643. The second blade 683 can form a reaction force with the high-speed rotating water flow after passing through the first impeller 643, which can further buffer the impact force of the water flow.

[0054] In one embodiment, the third buffer device 69 includes a guide rod 692 disposed at an equal angle at the lower part of the mounting box 61, a buffer net 691 sleeved on the guide rod 692, and a limiting plate 693 disposed at the lower part of the guide rod 692. The buffer net 691 is located below the mounting box 61.

[0055] With this design, after the water flows through the buffer net 691, the water flow with a certain velocity is further buffered, so that the water flowing into the bottom of the water jet tank 1 has a smaller velocity, reducing the impact of the water flow on the output of the water pump 4.

[0056] In one embodiment, the guide rod 692 is fitted with an elastic element 694 between the buffer net 691 and the limiting plate 693. The elastic element 694 is made of a spring or an elastic pad.

[0057] With this design, when the buffer net 691 is impacted by the water flow, it will compress the elastic element 694. The elastic element 694 will convert kinetic energy into elastic potential energy, which can further buffer the impact force of the water flow.

[0058] In one embodiment, a fixing plate 62 is provided on the mounting box 61, and the fixing plate 62 is connected to the inner wall of the water jet box 1 by fixing bolts 63.

[0059] This design, which uses fixing bolts 63 to fix the fixing plate 62 to the water jet tank 1, makes it convenient to install and fix the mounting box 61.

[0060] Furthermore, if the embodiments involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relation to the specification. The significance or implied number of the indicated technical features is not specified. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

Claims

1. A buffer flow stabilizing device for a steam turbine water jet ejection system, comprising a base plate (5), a water jet tank (1) disposed on the base plate (5), a water jet ejector (2) disposed on the upper part of the water jet tank (1), a water pipe (3) disposed on one side of the water jet tank (1), and a water pump (4) disposed on one side of the water pipe (3) and disposed on the upper part of the base plate (5), wherein the water pump (4) is connected to the water jet ejector (2) through the water pipe (3) to form a circulation system, characterized in that, Also includes: A buffer unit (6) is provided inside the water jet tank (1) and connected to the water jet air pump (2) for buffering the water flow ejected by the water jet air pump (2). The buffer unit (6) includes: Mounting box (61) is installed on the inner wall of the water jet tank (1) to restrict the direction of water flow ejected by the water jet pump (2); The first buffer device (64) is installed inside the mounting box (61) to provide initial buffering for the water flow ejected by the water jet pump (2); The second buffer device (68) is disposed inside the mounting box (61) and located below the first buffer device (64) for further buffering the water flow ejected by the water jet pump (2). The transmission device (66) is disposed between the first buffer device (64) and the second buffer device (68) for transmitting the kinetic energy of the first buffer device (64), so that the transmission device (66) drives the second buffer device (68) to rotate in opposite directions to the first buffer device (64); A third buffer device (69) is provided at the lower part of the mounting box (61) for further buffering the water flow ejected by the water jet pump (2).

2. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 1, characterized in that: The first buffer device (64) includes a fixed base (610) disposed at the bottom of the mounting box (61), a rotating shaft (65) disposed on the fixed base (610), and a rotating component disposed on the upper part of the rotating shaft (65). The rotating component is located at the water inlet at the upper part of the mounting box (61).

3. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 2, characterized in that: The rotating component includes a connecting block (642) disposed on the upper part of the rotating shaft (65), a buffer plate (641) disposed on the upper part of the connecting block (642), and a first impeller (643) spaced on the buffer plate (641). The buffer plate (641) is located directly below the water inlet of the mounting box (61).

4. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 3, characterized in that: The upper part of the buffer plate (641) is tapered.

5. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 2, characterized in that: The transmission device (66) includes a mounting bracket (661) sleeved on the rotating shaft (65), a connecting shaft (662) set at an equal angle at the lower part of the mounting bracket (661), a first gear (663) sleeved on the connecting shaft (662), and a toothed ring (67) set on the inner wall of the mounting box (61), wherein the first gear (663) is threadedly connected to the toothed ring (67).

6. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 5, characterized in that: The second buffer device (68) includes a second gear (681) threadedly connected to the first gear (663), a collar (682) disposed inside the second gear (681), and a second impeller (683) disposed on the collar (682). The collar (682) is sleeved on the rotating shaft (65).

7. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 1, characterized in that: The third buffer device (69) includes a guide rod (692) set at an equal angle at the lower part of the mounting box (61), a buffer net (691) sleeved on the guide rod (692), and a limiting plate (693) set at the lower part of the guide rod (692). The buffer net (691) is located below the mounting box (61).

8. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 7, characterized in that: The guide rod (692) is fitted with an elastic element (694) between the buffer net (691) and the limiting plate (693).

9. A buffer flow stabilizing device for a steam turbine water jet extraction system according to claim 1, characterized in that: The mounting box (61) is provided with a fixing plate (62), which is connected to the inner wall of the water jet tank (1) by fixing bolts (63).

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