A steam-driven feed water pump with high-efficiency sealing structure

Abstract

The utility model relates to steam feed pump technical field discloses a steam feed pump with high -efficient sealing structure, and the utility model solves the problem that the existing sealing washer is easy to spring and is easy to move, and the water inlet pipe backwater can cause the sealing washer sealing effect to be poor. A steam feed pump with high -efficient sealing structure, including steam pump main part, water inlet pipe, water outlet pipe, the lower side of water inlet pipe still is connected with the flange, the inside of flange is provided with support groove, the inside of support groove is provided with support block, the other side of support block is located inside bellows, the inside of bellows is provided with first sealing washer, the top of first sealing washer is provided with flow guide block, the lower side of first sealing washer is connected with extension block, the lower side of extension block is connected with second sealing washer, the center of extension block is provided with water inlet, guarantee the sealing effect of first sealing washer through support block and bellows cooperation, prevent leakage caused by backwater through flow guide block and second sealing washer cooperation.

Description

Technical Field

[0001] This utility model relates to the field of steam-driven water pump technology, specifically a steam-driven water pump with a high-efficiency sealing structure. Background Technology

[0002] Steam-driven feedwater pumps are core fluid transport equipment in thermal power generation, nuclear power, and large-scale industrial power systems. Powered by steam turbines, they can stably transport boiler feedwater under high temperature and high pressure conditions, directly determining the unit's thermal efficiency and operational safety. As the power industry develops towards ultra-supercritical and combined cycle technologies with higher parameters, the flow rate and pressure rating of steam-driven feedwater pumps continue to increase, while the requirements for equipment operational reliability and mean time between failures (MTBF) also significantly increase.

[0003] The inlet and outlet pipes serve as the medium transport channels for the steam-driven feedwater pump. Their connection to the pump body typically uses flange structures. The sealing performance at this point directly affects the overall operational stability of the feedwater pump. Currently, the mainstream flange sealing solutions in the industry mainly consist of rubber gaskets, traditional metal spiral wound gaskets, or graphite composite gaskets. However, existing gaskets still have the following problems during use: Existing gaskets are subjected to long-term water flow impact during use. In order to improve their service life, they are often used in conjunction with springs to buffer the flow and slow down the time of failure. However, the springs are also prone to movement during use, which can cause gaps at the connection between the gasket and the flange. Furthermore, backflow of water may occur in the inlet pipe, further creating gaps and resulting in a decrease in the sealing effect of the gasket. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the sealing gasket is prone to spring movement in the existing technology, and the sealing effect of the sealing gasket will be deteriorated when water flows back from the inlet pipe. To this end, we propose a steam-driven water pump with a high-efficiency sealing structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a steam-driven water pump with a high-efficiency sealing structure, comprising a steam-driven pump body, an inlet pipe disposed on the upper front side of the steam-driven pump body, an outlet pipe disposed on the upper rear side of the steam-driven pump body, a flange connected below the inlet pipe, a support groove provided on the inner side of the flange, a support block disposed inside the support groove, the other side of the support block being located inside a bellows, a first sealing ring disposed inside the bellows, a guide block disposed above the first sealing ring, an extension block connected below the first sealing ring, a second sealing ring connected below the extension block, and an inlet disposed at the center of the extension block.

[0006] Preferably, the steam pump body is connected to the inlet pipe via a flange, and multiple threaded pins are evenly distributed around the flange. The steam pump body is also connected to the outlet pipe via a flange. The inlet and outlet pipes are fixed by the flange, which facilitates the operation of the steam pump body.

[0007] Preferably, the flange has support grooves evenly and equidistantly distributed around its perimeter. The support grooves are connected to the support blocks in a sliding connection. The length of the support block is greater than the length of the support groove. The cooperation between the support block and the support groove facilitates the subsequent fixing and support of the bellows, preventing excessive movement.

[0008] Preferably, the support block is connected to the bellows by a sliding connection, and the bellows is connected to the flange by an interference fit. The support blocks are evenly and equidistantly distributed around the bellows to support the bellows and prevent excessive movement during use, which could lead to a deterioration in the sealing effect of the first sealing ring.

[0009] Preferably, the first sealing ring is tightly fitted to the inner side of the bellows, and the connection between the first sealing ring and the guide block is a sliding connection. The guide block consists of a top plate and a central funnel. The guide block concentrates the water flow towards the center for discharge, preventing the water flow from directly impacting the first sealing ring.

[0010] Preferably, a first sealing ring and a second sealing ring are fixedly connected to the upper and lower sides of the extension block, respectively. The diameter of the second sealing ring is consistent with the distance between the extension block and the inner wall of the water inlet pipe. Water inlets are evenly and equidistantly distributed around the extension block. The extension block and the second sealing ring cooperate to prevent backflow from impacting the first sealing ring and ensure the sealing performance of the first sealing ring.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The sealing effect of the first sealing ring is ensured by the cooperation of the support block and the bellows: the bellows is set on the outside of the first sealing ring and cooperates with the support block. The bellows provides elastic compensation so that the first sealing ring is always sealed when impacted by water flow. The support block connects the bellows and the first sealing ring, which prevents the bellows from moving too much and facilitates subsequent integrated disassembly and maintenance.

[0012] The guide block works in conjunction with the second sealing ring to prevent backflow and leakage: The guide block ensures that the water flows evenly towards the center, preventing direct impact on the first sealing ring. The second sealing ring and extension block are located below. When the water flows, it enters the interior of the extension block through the inlet. When backflow occurs, it impacts the second sealing ring, preventing impact on the first sealing ring and ensuring its sealing performance. Attached Figure Description

[0013] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the flange of this utility model; Figure 3 This is a top-view three-dimensional structural diagram of the first sealing ring of this utility model; Figure 4 This is a bottom-view perspective view of the first sealing ring of this utility model. Figure 5 This is a schematic diagram of the flange cross-sectional structure of this utility model; Figure 6 This is a schematic diagram of the exploded structure of the corrugated pipe of this utility model.

[0014] In the diagram: 1. Main body of the steam pump; 2. Flange; 3. Inlet pipe; 4. Outlet pipe; 5. Support groove; 6. Support block; 7. Bellows; 8. First sealing ring; 9. Guide block; 10. Extension block; 11. Second sealing ring; 12. Inlet. Detailed Implementation

[0015] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0016] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0017] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6A steam-driven water pump with a high-efficiency sealing structure includes a steam-driven pump body 1. An inlet pipe 3 is located on the upper front side of the pump body 1 for convenient water intake. An outlet pipe 4 is located on the upper rear side of the pump body 1 for rapid water discharge and convenient water circulation. A flange 2 is connected below the inlet pipe 3 for quick fixation, ensuring the usability of the inlet pipe 3. A support groove 5 is provided on the inner side of the flange 2, which limits and fixes a support block 6 to prevent slippage. A support block 6 is located inside the support groove 5, supporting a bellows 7 to prevent excessive movement. The other side of the support block 6 is located inside the bellows 7, which provides elastic compensation to prevent... To prevent excessive movement of the first sealing ring 8 and subsequent leakage, the bellows 7 is equipped with a first sealing ring 8 inside. The first sealing ring 8 ensures a seal and prevents water leakage from the flange 2. A guide block 9 is provided above the first sealing ring 8 to guide the water flow towards the center. An extension block 10 is connected below the first sealing ring 8 and extends downward to assist in connecting the second sealing ring 11. The second sealing ring 11 is connected below the extension block 10 and seals the area below to prevent backflow from impacting the first sealing ring 8. A water inlet 12 is provided in the center of the extension block 10 to ensure that the water flow is above the second sealing ring 11, preventing backflow from affecting the movement of the second sealing ring 11.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The steam pump body 1 is connected to the water inlet pipe 3 through a flange 2. Multiple threaded pins are evenly distributed around the flange 2. The steam pump body 1 is also connected to the water outlet pipe 4 through a flange 2. The water inlet pipe 3 and the water outlet pipe 4 are fixed by the flange 2 to facilitate the operation of the steam pump body 1.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The flange 2 has support grooves 5 evenly and equidistantly distributed around its perimeter. The support grooves 5 are connected to the support blocks 6 by a sliding connection. The length of the support blocks 6 is greater than the length of the support grooves 5. The cooperation between the support blocks 6 and the support grooves 5 facilitates the subsequent fixed support of the bellows 7 and prevents it from moving too much. The support blocks 6 are connected to the bellows 7 by a sliding connection, while the bellows 7 is connected to the flange 2 by an interference fit. The support blocks 6 are evenly and equidistantly distributed around the bellows 7 to support it and prevent it from moving too much during use, which would cause the sealing effect of the first sealing ring 8 to deteriorate.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The first sealing ring 8 is tightly fitted to the inner side of the bellows 7. The connection between the first sealing ring 8 and the guide block 9 is a sliding connection. The guide block 9 consists of a top plate and a central funnel. The guide block 9 concentrates the water flow towards the center and discharges it, avoiding direct impact of the water flow on the first sealing ring 8. The first sealing ring 8 and the second sealing ring 11 are fixedly connected to the upper and lower sides of the extension block 10, respectively. The diameter of the second sealing ring 11 is consistent with the distance between the extension block 10 and the inner wall of the water inlet pipe 3. The extension block 10 has water inlets 12 evenly distributed around its perimeter. The extension block 10 and the second sealing ring 11 cooperate to prevent backflow from impacting the first sealing ring 8 and ensure the sealing performance of the first sealing ring 8.

[0022] Working principle: First, the inlet pipe 3 and outlet pipe 4 are fastened to the main body 1 of the steam pump through the threaded pins on flange 2, forming a stable medium conveying channel. When the main body 1 of the steam pump starts, the medium to be conveyed flows in from the inlet pipe 3 and first contacts the guide block 9. Because the guide block 9 adopts a top plate and center funnel structure, it can concentrate and guide the dispersed medium flowing in to the central area. The plate covers the top of the first sealing ring 8 to avoid the medium directly impacting the first sealing ring 8, reducing the wear of the seal due to water flow impact, and reducing the problem of uneven pressure on the sealing surface caused by medium turbulence. During this process, the first sealing rings fixed on the upper and lower sides of the extension block 10 are respectively The first sealing ring 8 and the second sealing ring 11 form a double sealing defense. The first sealing ring 8 is tightly fitted to the inner side of the bellows 7. Dynamic sealing is achieved by utilizing the elastic deformation capability of the bellows 7. When the medium pressure fluctuates or the pipeline undergoes slight displacement due to thermal expansion and contraction, the bellows 7 can adapt to the sealing surface fitting requirements, ensuring that the first sealing ring 8 is always in close contact with the sealing surface of the flange 2. At the same time, the support block 6 in the support groove 5 inside the flange 2 is slidably connected to the bellows 7, which allows the bellows 7 to undergo reasonable deformation while limiting its excessive movement, avoiding the first sealing ring 8 from being misaligned due to the displacement of the bellows 7, forming a double guarantee of elastic compensation and rigid limit. Meanwhile, when backflow occurs in the inlet pipe 3, the backflow first acts on the second sealing ring 11. Since the diameter of the second sealing ring 11 is consistent with the distance between the extension block 10 and the inner wall of the inlet pipe 3, it can completely block the backflow from penetrating upward. At the same time, some water flows into the interior of the extension block 10 through the inlets 12 around the extension block 10. The structural design of the extension block 10 concentrates the backflow pressure on the second sealing ring 11, preventing the backflow from directly impacting the first sealing ring 8, and further protecting the sealing integrity of the first sealing ring 8. In addition, the water flow above the second sealing ring 11 inside the extension block 10 helps to disperse the pressure, prevent the second sealing ring 11 from sliding, and ensure the stability of the second sealing ring 11. Moreover, the inlet 12 is located below the extension block 10 and above the second sealing ring 11. After the water flow is completely discharged, the water flow inside the extension block 10 automatically flows out along the inlet 12 and will not accumulate inside the extension block 10.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam-driven feedwater pump with a high-efficiency sealing structure, comprising a steam-driven pump body, characterized in that: A water inlet pipe is provided on the upper front side of the main body of the pneumatic pump, and a water outlet pipe is provided on the upper rear side of the main body of the pneumatic pump. A flange is also connected below the water inlet pipe. A support groove is provided on the inner side of the flange. A support block is provided inside the support groove. The other side of the support block is located inside the bellows. A first sealing ring is provided inside the bellows. A flow guide block is provided above the first sealing ring. An extension block is connected below the first sealing ring. A second sealing ring is connected below the extension block. A water inlet is provided in the center of the extension block.

2. The steam-driven feedwater pump with a high-efficiency sealing structure according to claim 1, characterized in that: The main body of the steam pump is connected to the inlet pipe via a flange, and multiple threaded pins are evenly distributed around the flange. The main body of the steam pump is also connected to the outlet pipe via a flange.

3. The steam-driven feedwater pump with a high-efficiency sealing structure according to claim 1, characterized in that: The flange is evenly and equidistantly distributed with support grooves around its perimeter. The support grooves are connected to the support blocks by a sliding connection. The length of the support blocks is greater than the length of the support grooves.

4. A steam-driven feedwater pump with a high-efficiency sealing structure according to claim 1, characterized in that: The support block is connected to the bellows by a sliding connection, and the bellows is connected to the flange by an interference fit. The support blocks are evenly and equidistantly distributed around the bellows.

5. A steam-driven feedwater pump with a high-efficiency sealing structure according to claim 4, characterized in that: The first sealing ring is tightly fitted to the inner side of the bellows. The first sealing ring is connected to the guide block by a sliding connection. The guide block is composed of a top plate and a central funnel.

6. A steam-driven feedwater pump with a high-efficiency sealing structure according to claim 1, characterized in that: The upper and lower sides of the extension block are respectively fixedly connected with a first sealing ring and a second sealing ring. The diameter of the second sealing ring is consistent with the distance between the extension block and the inner wall of the water inlet pipe. Water inlets are evenly and equidistantly distributed around the extension block.

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