Condenser vacuumizing device of generator

Abstract

The utility model discloses a condenser vacuum-pumping device of a generator, which comprises a vacuum-pumping pipe, a mounting seat is fixedly arranged in the middle of the vacuum-pumping pipe, a sealing cover covers the surface of the mounting seat, one end of the vacuum-pumping pipe is fixedly welded with a vacuum pump communication flange, and the other end of the vacuum-pumping pipe is fixedly welded with a condenser communication flange. According to the condenser vacuumizing device of the generator, when the water ring vacuum pump is closed, the spring in the instant vacuumizing pipe is reset in a compressed state, so that the negative pressure plate is inserted into the communicating opening, the locking work of the interior of the condenser is completed, external gas cannot enter the interior of the condenser, and the sealing effect of the condenser is improved. The realization of a vacuum environment in the condenser is ensured; the situation that residual air can increase the pressure in the condenser, so that steam cannot fully expand to do work, and the heat efficiency of the whole thermodynamic cycle is reduced can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of condenser vacuum extraction, in particular to a condenser vacuum extraction device for a generator. Background Technique

[0002] There are several important reasons for the vacuum extraction of the condenser of a generator:

[0003] Improve thermal efficiency: In a steam power cycle, a lower condenser pressure means that steam can expand and do work to a greater extent; vacuum extraction reduces the pressure inside the condenser, enabling steam to release more energy during the expansion process, thereby improving the thermal efficiency of the entire cycle; for example, in a thermal power plant, for every 1% increase in the condenser vacuum degree, the unit thermal efficiency can be increased by approximately 0.8% - 1.2%;

[0004] Reduce cold source loss: In a vacuum state, steam can condense into water faster, reducing the heat loss carried away by steam in the condenser; this allows more heat to be effectively utilized, improving the energy utilization rate;

[0005] The vacuum extraction of the condenser of a generator is usually achieved through the following method: Water ring vacuum pump for vacuum extraction: A water ring vacuum pump is a common vacuum extraction device; by the rotation of the impeller, a water ring is formed inside the pump body, thereby generating the functions of suction and exhaust; during operation, the water ring continuously sucks in, compresses, and discharges gas, gradually reducing the pressure inside the condenser; for example, in a large thermal power plant, multiple water ring vacuum pumps are usually equipped to meet the vacuum extraction requirements;

[0006] The suction pipe of the water ring vacuum pump is connected to the vacuum pipeline of the condenser to carry out the vacuum extraction work. When the water ring vacuum pump is turned off, the air inside the vacuum pipe and the suction pipe will flow back into the inside of the condenser, causing air to easily remain inside the condenser. The remaining air will increase the pressure inside the condenser, making the steam unable to fully expand and do work, thereby reducing the thermal efficiency of the entire thermal cycle. Content of the Utility Model

[0007] The purpose of the utility model is to provide a condenser vacuum extraction device for a generator to solve the defects mentioned in the above background technique.

[0008] To achieve the above object, a steam condenser vacuum extraction device for a generator is provided, which includes a vacuum extraction pipe. An installation seat is fixedly arranged in the middle of the vacuum extraction pipe, and a sealing cover covers the surface of the installation seat. One end of the vacuum extraction pipe is fixedly welded to a connecting flange of a vacuum pump, and the other end of the vacuum extraction pipe is fixedly welded to a connecting flange of a steam condenser. A one-way flow component is arranged inside the installation seat. The one-way flow component includes a connecting seat fixedly arranged inside the installation seat. A negative pressure plate is movably arranged on one side of the connecting seat. A guide column is fixedly installed at the end of the negative pressure plate. The guide column passes through a guide hole opened in the middle of a positioning plate. The positioning plate is fixedly connected inside the installation seat, and a spring is installed on the outer side of the guide column.

[0009] Preferably, the axial cross-sections of the vacuum extraction pipe, the connecting flange of the vacuum pump, the connecting flange of the steam condenser, and the installation seat are concentric circle structures. The connecting flange of the vacuum pump is connected to an external vacuum pump, and the connecting flange of the steam condenser is connected to an external steam condenser.

[0010] Preferably, the cross-section of the sealing cover is arc-shaped. Positioning seats are fixedly arranged on both sides of the bottom of the sealing cover. The positioning seats cover the end face of the installation seat and are fixed by multiple groups of bolts.

[0011] Preferably, the sealing cover and the installation seat are sealed and connected through a sealing gasket. The two ends of the bottom of the sealing cover cover the surface of the vacuum extraction pipe and are sealed through a rubber gasket.

[0012] Preferably, a communication port is opened inside the connecting seat. The communication port is adapted to the size of the negative pressure plate. The negative pressure plate is clamped inside the communication port. A sealing ring is installed on the outer side of the negative pressure plate. The sealing ring and the negative pressure plate are concentric circle structures.

[0013] Preferably, multiple groups of air holes are evenly opened on the surface of the positioning plate. A spring is arranged between the positioning plate and the negative pressure plate. A circular limiting piece is fixedly welded to the end of the guide column away from the negative pressure plate.

[0014] Compared with the prior art, the beneficial effect of the present utility model is that when the water ring vacuum pump is closed, the spring in the vacuum extraction pipe that is in a compressed state instantaneously resets, so that the negative pressure plate is inserted into the communication port, completing the locking work of the inside of the steam condenser, preventing external gas from entering the inside of the steam condenser, and ensuring the realization of the vacuum environment inside the steam condenser; it can avoid the situation that the remaining air increases the pressure inside the steam condenser, causing the steam not to fully expand and do work, thereby reducing the thermal efficiency of the entire thermal cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the structure of the present utility model;

[0016] Figure 2Schematic diagram of the structure of the one-way flow component of the structure of the present utility model;

[0017] Figure 3 Structure of the present utility model Figure 2 Bottom view;

[0018] Figure 4 Structure of the present utility model Figure 2 Top view.

[0019] Reference numerals in the figure: 1, vacuum extraction pipe; 2, vacuum pump connection flange; 3, condenser connection flange; 4, mounting seat; 5, sealing gasket; 6, positioning seat; 7, sealing cover; 8, one-way flow component; 81, connection seat; 82, connection port; 83, sealing ring; 84, negative pressure plate; 85, spring; 86, positioning plate; 87, guide post. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-4 , the present utility model provides a condenser vacuum extraction device for a generator, including a vacuum extraction pipe 1. A mounting seat 4 is fixedly arranged in the middle of the vacuum extraction pipe 1, and a sealing cover 7 covers the surface of the mounting seat 4. At the same time, one end of the vacuum extraction pipe 1 is fixedly welded to the vacuum pump connection flange 2, and the other end of the vacuum extraction pipe 1 is fixedly welded to the condenser connection flange 3. A one-way flow component 8 is arranged inside the mounting seat 4. The one-way flow component 8 includes a connection seat 81 fixedly arranged inside the mounting seat 4. A negative pressure plate 84 is movably arranged on one side of the connection seat 81. At the same time, a guide post 87 is fixedly installed at the end of the negative pressure plate 84, and the guide post 87 passes through a guide hole opened in the middle of the positioning plate 86. The positioning plate 86 is fixedly connected inside the mounting seat 4, and a spring 85 is installed outside the guide post 87.

[0022] Working principle: When in use, the vacuum pump connecting flange 2 at one end of the vacuum extraction pipe 1 is connected to an external vacuum pump, and the condenser connecting flange 3 at the other end of the vacuum extraction pipe 1 is connected to an external condenser. The water ring vacuum pump continuously sucks in, compresses, and discharges gas, gradually reducing the pressure inside the condenser to complete the vacuum extraction operation on the inside of the condenser; when the water ring vacuum pump is evacuating the inside of the condenser, the strong suction acts on the surface of the negative pressure plate 84, causing the negative pressure plate 84 to move horizontally against the elastic force of the spring 85 to discharge the gas inside the condenser; when the water ring vacuum pump is turned off, the spring 85 in a compressed state inside the vacuum extraction pipe 1 instantly resets, causing the negative pressure plate 84 to be inserted into the inside of the communication port 82 to complete the locking operation on the inside of the condenser, preventing external gas from entering the inside of the condenser and ensuring the realization of a vacuum environment inside the condenser; it can avoid the situation where the remaining air increases the pressure inside the condenser, preventing the steam from fully expanding and doing work, thereby reducing the thermal efficiency of the entire thermal cycle.

[0023] As a preferred embodiment, the axial cross-section of the vacuum extraction pipe 1, the vacuum pump connecting flange 2, the condenser connecting flange 3, and the mounting seat 4 is a concentric circle structure, and the vacuum pump connecting flange 2 is connected to an external vacuum pump, while the condenser connecting flange 3 is connected to an external condenser.

[0024] The cross-section of the sealing cover 7 is arc-shaped, and positioning seats 6 are fixedly arranged on both sides of the bottom of the sealing cover 7. At the same time, the positioning seats 6 cover the end face of the mounting seat 4 and are fixed by multiple groups of bolts.

[0025] As Figures 1-4 shown: The sealing cover 7 covers the outside of the vacuum extraction pipe 1 and the mounting seat 4. At the connection between the sealing cover 7, the vacuum extraction pipe 1, and the mounting seat 4, they are all connected by a sealing gasket 5 to prevent air leakage at the connection between the sealing cover 7, the vacuum extraction pipe 1, and the mounting seat 4.

[0026] As a preferred embodiment, the sealing cover 7 and the mounting seat 4 are sealed and connected by a sealing gasket 5, and both ends of the bottom of the sealing cover 7 cover the surface of the vacuum extraction pipe 1 and are sealed by a rubber gasket.

[0027] As Figures 1-4 shown: A communication port 82 is opened inside the communication seat 81, and the communication port 82 is adapted to the size of the negative pressure plate 84. At the same time, the negative pressure plate 84 is clamped inside the communication port 82, and a sealing ring 83 is installed on the outside of the negative pressure plate 84. The sealing ring 83 and the negative pressure plate 84 are concentric circle structures.

[0028] Multiple groups of air holes are evenly opened on the surface of the positioning plate 86, a spring 85 is arranged between the positioning plate 86 and the negative pressure plate 84, and a circular limiting piece is welded and fixed to the end of the guiding column 87 away from the negative pressure plate 84.

[0029] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A condenser vacuum extraction device for a generator, comprising a vacuum extraction pipe (1), characterized in that: A mounting seat (4) is fixedly arranged in the middle of the evacuation pipe (1), and a sealing cover (7) covers the surface of the mounting seat (4). At the same time, one end of the evacuation pipe (1) is fixedly welded to the vacuum pump connecting flange (2), and the other end of the evacuation pipe (1) is fixedly welded to the condenser connecting flange (3). A one-way flow component (8) is arranged inside the mounting seat (4). The one-way flow component (8) includes a connecting seat (81) fixedly arranged inside the mounting seat (4). A negative pressure plate (84) is movably arranged on one side of the connecting seat (81). At the same time, a guide post (87) is fixedly installed at the end of the negative pressure plate (84), and the guide post (87) passes through a guide hole formed in the middle of a positioning plate (86). The positioning plate (86) is fixedly connected inside the mounting seat (4), and a spring (85) is installed on the outer side of the guide post (87).

2. The steam condenser vacuum extraction device of a generator according to claim 1, characterized in that: The axial sections of the evacuation pipe (1), the vacuum pump connecting flange (2), the condenser connecting flange (3) and the mounting seat (4) are concentric circle structures. The vacuum pump connecting flange (2) is connected to an external vacuum pump, and at the same time, the condenser connecting flange (3) is connected to an external condenser.

3. The vacuum extraction device for the condenser of a generator according to claim 1, characterized in that: The cross-section of the sealing cover (7) is arc-shaped. Positioning seats (6) are fixedly arranged on both sides of the bottom of the sealing cover (7). At the same time, the positioning seats (6) cover the end face of the mounting seat (4) and are fixed by multiple groups of bolts.

4. The steam condenser vacuum extraction device of a generator according to claim 3, characterized in that: A sealing connection is made between the sealing cover (7) and the mounting seat (4) through a gasket (5). The two ends of the bottom of the sealing cover (7) cover the surface of the evacuation pipe (1) and are sealed through rubber gaskets.

5. The steam condenser vacuum extraction device of a generator according to claim 1, characterized in that: A communication port (82) is formed inside the connecting seat (81). The communication port (82) is adapted to the size of the negative pressure plate (84). At the same time, the negative pressure plate (84) is clamped inside the communication port (82), and a sealing ring (83) is installed on the outer side of the negative pressure plate (84). The sealing ring (83) and the negative pressure plate (84) are concentric circle structures.

6. The steam condenser vacuum extraction device of a generator according to claim 1, characterized in that: Multiple groups of air holes are evenly formed on the surface of the positioning plate (86). A spring (85) is arranged between the positioning plate (86) and the negative pressure plate (84). At the same time, a circular limiting piece is fixedly welded to the end of the guide post (87) away from the negative pressure plate (84).

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