Automatic exhaust valve of circulating cooling water system of power plant

Abstract

The invention relates to an automatic exhaust valve of a circulating cooling water system of a power plant. A horn mouth structure is formed on the inner side of an exhaust port of a valve body; the sleeve is arranged in the valve body and forms an exhaust channel with the inner wall of the valve body; the solid floating body is in vertical sliding fit in the sleeve; the hollow rubber ball is connected with the upper surface of the solid floating body through a first pull rope; when the valve body is filled with water, the hollow rubber ball and the solid floating body float upwards, so that the hollow rubber ball blocks the exhaust port and further presses the hollow rubber ball upwards under the action of buoyancy of the solid floating body, and water leakage caused by untight sealing of the exhaust port is prevented. When no water exists in the valve body, the hollow rubber ball and the solid floating body lose buoyancy and fall back naturally. The weight of the solid floating body can ensure that certain resistance can be overcome in the process, and the hollow rubber ball is pulled down through the first pull rope to prevent the hollow rubber ball from being clamped at the exhaust port and cannot fall back.

Description

Technical Field

[0001] The invention relates to the technical field of automatic exhaust valves, and in particular to an automatic exhaust valve for a circulating cooling water system of a power plant. Background Art

[0002] Automatic exhaust valve is an indispensable and important part in water circulation pipe network systems such as heating, air conditioning, and cooling. Due to various reasons, bubbles accumulate in the circulating water, forming air resistance, increasing the running resistance of the medium, and even causing local water circulation stagnation. In order to eliminate the air resistance of the water circulation system and ensure smooth circulation, it is necessary to install an automatic exhaust valve to automatically discharge the gas in the circulating water from the system without leaking.

[0003] Manual exhaust valves are now commonly used in circulating cooling water systems of power plants. For gas turbine power plants that need to be started and stopped frequently, it is very troublesome to go to the site to manually open and close the exhaust valve every time it is started.

[0004] The automatic exhaust valves currently on the market have harder sealing components and are more suitable for environments with high pressure and good water quality. For example, the "automatic exhaust valve" disclosed in patent publication number CN200955583Y includes an exhaust nozzle, a piston, a valve cover, a valve body and a float. The float is in the valve body, and the valve cover is provided with an air outlet channel. The gap between the valve body and the float is an air inlet channel, and the air outlet channel and the air inlet channel are connected. The piston is fixed on the float, and the upper end of the piston has a surface that can be sealed with the inlet of the air outlet channel.

[0005] However, in the circulating cooling water system of a power plant, the pressure is low (usually within 0.07-0.15Mpa) and the water quality is poor. Under such low-pressure conditions, it is easy to leak due to poor sealing. Therefore, an automatic exhaust valve suitable for low-pressure conditions is needed; for example, the exhaust valve "CN102748527A" disclosed in patent publication number CN102748527A is composed of a valve mouth, a valve shell, a valve core, a valve body, a guide groove, a lever, a float, etc. This automatic exhaust valve opens when it sees air and closes when it sees water.

[0006] However, directly opening and closing the air outlet of the valve by pushing the solid valve core through buoyancy is prone to water leakage. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an automatic exhaust valve for a circulating cooling water system of a power plant to solve the above problems.

[0008] The present invention provides the following technical solutions:

[0009] An automatic exhaust valve for a circulating cooling water system of a power plant, comprising:

[0010] The valve body has an exhaust port at the top, and a bell-mouth structure is formed inside the exhaust port;

[0011] A sleeve is arranged inside the valve body and forms an exhaust passage between the valve body and the inner wall of the valve body;

[0012] A solid float, which slides vertically in the sleeve;

[0013] The hollow rubber ball is arranged above the solid floating body and is connected to the upper surface of the solid floating body through a first pull rope.

[0014] Preferably, a filter screen is provided at the bottom input port of the valve body.

[0015] Preferably, the sleeve is fixed to the inner wall of the valve body through a support rod.

[0016] Preferably, a groove matching the hollow rubber ball is provided on the upper surface of the solid float.

[0017] Preferably, a rotating rod is freely connected inside the valve body, and the rotating rod is located between the exhaust port and the sleeve. When the solid float presses the hollow rubber ball upward under the action of buoyancy to close the exhaust port of the bell-mouth structure, the hollow rubber ball is squeezed and deformed to push the upper end of the rotating rod to rotate, and the lower end of the rotating rod rotates in the opposite direction to press the lower part of the hollow rubber ball.

[0018] Preferably, the hollow rubber ball comprises a hollow outer ball and a solid inner ball arranged inside the hollow outer ball, and the space between the hollow outer ball and the solid inner ball is inflated.

[0019] Preferably, evenly arranged second pull ropes are connected between the hollow outer ball and the solid inner ball.

[0020] Preferably, the hollow outer ball comprises a flexible plastic portion and an elastic portion, and the elastic portion is located on a side close to the exhaust port.

[0021] Preferably, the outer shape of the solid inner ball is matched with the exhaust port of the valve body, the center of gravity of the solid inner ball is located on the side close to the first pull rope, and the solid inner ball is made of elastic material.

[0022] Preferably, a push groove is provided on the side wall of the solid float, and the lower end of the rotating rod is inserted into the push groove of the side wall of the solid float when rotating.

[0023] The present invention has the following beneficial technical effects:

[0024] The present invention can reduce the manual operation of repeatedly injecting water and exhausting air in a circulating water system during the start-up and shutdown process of a gas turbine power plant.

[0025] When the valve body is filled with water, the hollow rubber ball and the solid float float up, so that the hollow rubber ball blocks the exhaust port, and the buoyancy of the solid float further presses the hollow rubber ball upward to prevent the exhaust port from leaking due to a loose seal.

[0026] When there is no water in the valve body, the hollow rubber ball and the solid float lose buoyancy and fall back naturally. The weight of the solid float can ensure that the process can overcome a certain resistance, and pull down the hollow rubber ball through the first pull rope to prevent the hollow rubber ball from being stuck in the exhaust port and unable to fall back. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention;

[0028] Figure 2 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0029] Figure 3 is a schematic diagram of a hollow rubber ball in Embodiment 2 of the present invention;

[0030] Figure 4 It is a schematic diagram of the solid floating body structure of the present invention.

[0031] The reference numerals in the figure are:

[0032] 1. Valve body; 2. Sleeve; 21. Support rod; 3. Solid float; 31. Groove; 32. Push groove; 4. First pull rope; 5. Hollow rubber ball; 51. Hollow outer ball; 511. Flexible plastic part; 512. Elastic part; 52. Solid inner ball; 53. Second pull rope; 6. Filter net; 7. Turn rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] Embodiment 1:

[0035] An automatic exhaust valve for a circulating cooling water system in a power plant, such as Figure 1 As shown:

[0036] The utility model comprises a valve body 1, a sleeve 2, a solid float 3, a first pull rope 4, a hollow rubber ball 5 and a filter screen 6.

[0037] The valve body 1 is hollow inside and has two ends, the upper end of which is an exhaust port, and the inner side of the exhaust port is a downward bell-mouth structure; the lower end is an input port.

[0038] The filter screen 6 is installed at the input port at the lower end of the valve body 1 to prevent impurities in the circulating water system from entering the valve body 1 .

[0039] The outer wall of the sleeve 2 is fixed to the inner cavity of the valve body 1 by a plurality of support rods 21, and an exhaust passage is formed between the outer wall of the sleeve 2 and the inner wall of the valve body 1. The air in the pipeline can pass through the lower end of the valve body 1 and the exhaust passage in sequence and be discharged from the exhaust port at the upper end of the valve body 1.

[0040] The solid float 3 is made of solid silicone rubber with a density of 0.8, which is slightly lower than that of water. The solid float 3 moves and fits relative to the vertical clearance of the inner wall of the sleeve 2; the solid float 3 will not leave the inner cavity of the sleeve 2.

[0041] A groove 31 is formed on the top wall of the solid float 3 near the exhaust port, and the groove 31 is matched with the hollow rubber ball 5 . A first pull rope 4 is connected between the groove 31 of the solid float 3 and the lower end of the hollow rubber ball 5 .

[0042] Working principle:

[0043] The water in the pipeline passes through the lower input port of the valve body 1 and fills the inner cavity of the valve body 1. During this process, the solid float 3 lifts the hollow rubber ball 5 upward under the action of the water buoyancy, so that the hollow rubber ball 5 fits the exhaust port of the bell-shaped structure at the upper end of the valve body 1. The hollow setting of the hollow rubber ball 5 can be deformed to further fit the exhaust port to achieve sealing closure. The solid float 3 further presses the hollow rubber ball 5 upward under the action of its own buoyancy. Only then does the water fill the valve body 1, and at this time, the exhaust port at the upper end of the valve body 1 has been blocked and closed by the hollow rubber ball 5.

[0044] The water in the valve body 1 fluctuates slightly, causing the solid float 3 to fluctuate slightly. Since the hollow rubber ball 5 has a hollow structure with greater buoyancy, and the hollow rubber ball 5 and the solid float 3 are connected by a first pull rope 4, the first pull rope 4 keeps the hollow rubber ball 5 stationary.

[0045] When there is no water in the pipe, the water level in the inner cavity of the valve body 1 drops, and the hollow rubber ball 5 and the solid float 3 lose buoyancy and fall back naturally. The weight of the solid float 3 can ensure that the process can overcome a certain resistance, and the hollow rubber ball 5 is pulled down by the first pull rope 4 to prevent the hollow rubber ball 5 from being stuck in the exhaust port and unable to fall back.

[0046] Embodiment 2 includes all the contents of Embodiment 1, except that Figure 2-4 As shown;

[0047] The middle part of the rotating rod 7 is rotatably connected to the inner cavity of the valve body 1, and the rotating rod 7 is located between the exhaust port at the upper end of the valve body 1 and the top wall of the sleeve 2, and the rotating rod 7 will not block the lifting and lowering of the hollow rubber ball 5. Under normal conditions, the outer diameter of the hollow rubber ball 5 when not subjected to external force is matched with the inner diameter of the sleeve 2 with a clearance fit.

[0048] The hollow rubber ball 5 comprises a hollow outer ball 51 and a solid inner ball 52 disposed inside the hollow outer ball 51. A plurality of evenly arranged second pull ropes 52 are connected between the hollow outer ball 51 and the solid inner ball 52. The hollow outer ball 51 is inflated so that the solid inner ball 52 is relatively suspended inside the hollow outer ball 51 under normal conditions. The solid inner ball 52 is made of rubber and can be elastically deformed, and the elastic deformation range is relatively large.

[0049] The upper half of the hollow outer ball 51 near the exhaust port is the elastic part 512, which can be elastically deformed to expand its size; the lower half of the hollow outer ball 51 near the solid float 3 is the flexible plastic part 511, which can be deformed but cannot expand its size, and one end of the first pull rope 4 is connected to the flexible plastic part 511.

[0050] The solid float 3 moves vertically in the sleeve 2 and cannot rotate; a push groove 32 is provided on the side wall of the solid float 3 .

[0051] Working principle:

[0052] During the process of filling the inner cavity of the valve body 1 with water, the solid float 3 first lifts the hollow rubber ball 5 upward under the action of the water buoyancy, so that the elastic part 512 of the hollow rubber ball 5 fits the exhaust port of the bell mouth structure at the upper end of the valve body 1, and the solid float 3 further presses the hollow rubber ball 5 upward under the action of its own buoyancy, and the hollow outer ball 51 is compressed and deformed, and lifts the solid inner ball 52 inside the hollow outer ball 51 to move upward and fit the exhaust port of the valve body 1, thereby improving the sealing between the elastic part 512 and the exhaust port;

[0053] The solid inner ball 52 is made of a flexible elastic deformable material, and is compressed and deformed by the solid floating body 3 moved upward by the solid floating body 3 to further improve the effect of closely fitting the exhaust port.

[0054] During this process, the hollow rubber ball 5 is squeezed and deformed so that the elastic portion 512 expands horizontally and contacts the upper end of the rotating rod 7 to push the rotating rod 7 to rotate.

[0055] The rotation of the rotating rod 7 causes its lower end to be inserted into the push groove 32 of the solid float 3. The lower end of the rotating rod 7 cooperates with the push groove 32 to further push the solid float 3 to move upward. The upward movement of the solid float 3 relatively makes the flexible plastic part 511 concave and the elastic part 512 convex to expand the body, thereby improving the sealing performance of the elastic part 512 of the hollow rubber ball 5 that is tightly pressed against the exhaust port.

[0056] Half of the elastic part 512 and the flexible plastic part 511 can expand in size, while the other half cannot. Thus, when the hollow outer ball 51 is compressed, only the elastic part 512 can expand outwards to adapt and push the upper end of the rotating rod 7 .

[0057] When there is no water in the pipe, the water level in the inner cavity of the valve body 1 drops. First, the solid float 3 drops and the hollow rubber ball 5 recovers. The eccentric gravity setting of the solid inner ball 52 drives the hollow rubber ball 5 to reset, so that the elastic part 512 is on the top and the flexible plastic part 511 is on the bottom. The solid float 3 that has dropped to a certain position pulls down the hollow rubber ball 5 through the first pull rope 4. The recovered hollow rubber ball 5 is pulled into the sleeve 2, keeping the elastic part 512 on the top and the flexible plastic part 511 on the bottom.

[0058] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An automatic exhaust valve for a circulating cooling water system of a power plant, characterized in that: include: The valve body (1) is provided with an exhaust port at the top, and the inner side of the exhaust port forms a bell-mouth structure; A sleeve (2) is arranged inside the valve body (1) and forms an exhaust passage with the inner wall of the valve body (1); A solid float (3) is vertically slidably fitted in the sleeve (2); The hollow rubber ball (5) is arranged above the solid floating body (3) and is connected to the upper surface of the solid floating body (3) via a first pull rope (4).

2. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 1, characterized in that: The bottom input port of the valve body (1) is provided with a filter screen (6).

3. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 1, characterized in that: The sleeve (2) is fixed to the inner wall of the valve body (1) via a support rod (21).

4. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 1, characterized in that: The upper surface of the solid float (3) is provided with a groove (31) adapted to the hollow rubber ball (5).

5. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 1, characterized in that: A rotating rod (7) is freely movable inside the valve body (1), and the rotating rod (7) is located between the exhaust port and the sleeve (2). When the solid float (3) presses the hollow rubber ball (5) upwards to close the exhaust port of the bell-shaped structure under the action of buoyancy, the hollow rubber ball (5) is squeezed and deformed to push the upper end of the rotating rod (7) to rotate, and the lower end of the rotating rod (7) rotates in the opposite direction to press the lower part of the hollow rubber ball (5).

6. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 5, characterized in that: The hollow rubber ball (5) comprises a hollow outer ball (51) and a solid inner ball (52) arranged inside the hollow outer ball (51), and the space between the hollow outer ball (51) and the solid inner ball (52) is inflated.

7. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 6, characterized in that: Evenly arranged second pull ropes (53) are connected between the hollow outer ball (51) and the solid inner ball (52).

8. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 7, characterized in that: The hollow outer ball (51) comprises a flexible plastic part (511) and an elastic part (512), wherein the elastic part (512) is located on a side close to the exhaust port.

9. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 7, characterized in that: The outer shape of the solid inner ball (52) is compatible with the exhaust port of the valve body (1), the center of gravity of the solid inner ball (52) is located on the side close to the first pull rope (4), and the solid inner ball (52) is made of elastic material.

10. The automatic exhaust valve of a circulating cooling water system of a power plant according to claim 5, characterized in that: The side wall of the solid floating body (3) is provided with a push groove (32), and the lower end of the rotating rod (7) is inserted into the push groove (32) of the side wall of the solid floating body (3) when rotating.

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