Narrow-surface intercepting nozzle for turbine

Abstract

The utility model discloses a narrow-face intercepting nozzle for a turbine, and relates to the technical field of intercepting nozzles. The device comprises a steam pipe, the flow dividing pipes are in through connection with the steam pipe and are symmetrically distributed, the valve body is in through connection with the flow dividing pipes, the flow collecting pipe is in through connection with the valve body, the converging bin is in through connection with the flow collecting pipe, the valve seat is located in the valve body, the valve rod is rotationally installed in the valve seat, and the valve blade is located on the outer wall of the valve rod and rotationally installed in the valve seat. And; the nozzle structure comprises an installation sleeve located at one end of the gathering bin, a spraying pipe located in the installation sleeve, a narrow-face nozzle connected with the spraying pipe in a penetrating mode, a gear ring connected to the outer wall of the spraying pipe in a sleeving mode, a motor fixedly arranged on the outer wall of the installation sleeve and a gear located at the output end of the motor and meshed with the gear ring. The adjusting structure is arranged, so that the problems of high maintenance cost and complexity and inconvenience in replacement caused by high loss due to long-term impact of high temperature and high pressure on the valve group between the turbine and the nozzle are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow nozzles, in particular to a narrow-surface cut-off nozzle for turbines. Background Art

[0002] The turbine uses the kinetic energy of high-pressure steam to drive the turbine to rotate, generate power, and finally convert it into mechanical work. The high-pressure steam impacts the blades to make the turbine rotate and generate power. In the steam turbine, the nozzle is used to inject high-pressure steam onto the turbine blades, so that the blades are subjected to thrust, thereby driving the turbine to rotate. The existing technology can improve the steam passage accuracy of the blades, but it cannot be quickly replaced when it is damaged.

[0003] A Chinese patent discloses a steam turbine nozzle group (authorization announcement number CN212985301U), which includes a plurality of nozzles, which are fixed into a circumferential shape by a clamping tool, and the plurality of nozzles are welded to form a nozzle group; wherein each of the nozzles includes a nozzle outer ring, a nozzle inner ring and a nozzle stator blade, the nozzle outer ring, the nozzle inner ring and the nozzle stator blade are an integrated structure, the nozzle stator blade is located between the nozzle outer ring and the nozzle inner ring, and a steam flow channel is formed between two adjacent nozzle stator blades. The steam turbine nozzle group proposed by the utility model can achieve a higher nozzle stator blade steam channel accuracy.

[0004] This patented technology improves the accuracy of the steam passage of the nozzle stationary blades when in use, but there are still some shortcomings during use. The nozzle is controlled by a valve, and the valve is subjected to the impact of high temperature and high pressure for a long time, resulting in large wear and tear, high maintenance costs, and cumbersome and inconvenient replacement. Therefore, technical personnel in this field provide a narrow-face shut-off nozzle for turbines to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0005] 1. Technical solution

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model discloses a narrow-surface intercepting nozzle for turbines, comprising a steam pipe;

[0008] An adjusting structure, a shunt pipe connected to the steam pipe and symmetrically distributed, a valve body connected to the shunt pipe, a collecting pipe connected to the valve body, a collecting chamber connected to the collecting pipe, a valve seat located inside the valve body, a valve stem rotatably mounted inside the valve seat, and a valve leaf located on the outer wall of the valve stem and rotatably mounted inside the valve seat;

[0009] as well as;

[0010] The nozzle structure includes a mounting sleeve located at one end of the convergence chamber, a nozzle located inside the mounting sleeve, a narrow nozzle connected to the nozzle, a gear ring sleeved on the outer wall of the nozzle, a motor fixed on the outer wall of the mounting sleeve, and a gear located at the output end of the motor and meshing with the gear ring.

[0011] Furthermore, a flange 1 is provided at one end of the steam pipe, and mounting holes distributed in a ring array are provided inside the flange 1;

[0012] Specifically, the steam pipe is butted against the turbine pipe via flange 1, and the mounting hole is used for mounting the fixings.

[0013] Furthermore, both front and rear ends of the valve body are provided with a rotating seat, the valve stem is rotatably installed inside the rotating seat, and one end of the valve stem is provided with a rotating handle;

[0014] Specifically, the valve stem is rotationally supported inside the rotating seat, and a rotational force is applied to the valve stem by rotating the rotating handle.

[0015] Furthermore, a second rectangular flange is provided at one end of the narrow nozzle, and a mounting hole is provided inside the second flange;

[0016] Specifically, the narrow nozzle is connected to the turbine through flange 2, and is fixedly installed by providing a flange and a mounting hole inside the flange 2.

[0017] Furthermore, a sealing ring is embedded in the inner wall of the nozzle, and the nozzle is rotatably installed inside the sealing ring;

[0018] Specifically, the sealing ring enables the nozzle to be rotationally sealed when rotating inside the mounting sleeve, and has good rotation support.

[0019] Furthermore, the inner wall of one end of the converging chamber is provided with a guide scoop located inside the nozzle;

[0020] Specifically, the guide bucket converges the transported steam toward the center of the nozzle.

[0021] 2. Beneficial effects

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

[0023] The utility model provides a shunt pipe between the steam pipe and the narrow nozzle, the shunt pipes are connected to the narrow nozzle, and are controlled by two groups of control valves. During use, different control valves can be switched to flow between any two shunt pipes, and the high temperature and high pressure impact of steam is shared during use, the loss of the valve group is reduced, and the service life of the valve group is increased;

[0024] At the same time, the narrow nozzle can be rotated and adjusted. When it is installed and docked with the turbine, the position of the narrow nozzle can be adjusted at will, which provides assistance for the installation of the narrow nozzle and the turbine.

[0025] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a top view of the three-dimensional structure of the utility model;

[0028] Figure 2 This is a bottom-up three-dimensional structural schematic diagram of the utility model;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the convergence bin of the utility model in a top-down cross-section;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the valve body of the utility model in top cross-section;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing ring of the utility model in rear section.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 100, steam pipe; 101, flange 1;

[0034] 200, regulating structure; 201, shunt pipe; 202, collecting pipe; 203, converging chamber; 204, valve stem; 205, valve leaf; 206, valve seat; 207, rotating seat; 208, rotary handle; 209, valve body;

[0035] 300, nozzle structure; 301, nozzle; 302, narrow nozzle; 303, flange 2; 304, mounting sleeve; 305, guide bucket; 306, sealing ring; 307, motor; 308, gear; 309, gear ring. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] See also Figure 1-Figure 5 As shown, this embodiment is a narrow-face intercepting nozzle for a turbine, comprising a steam pipe 100;

[0042] The regulating structure 200 includes a flow divider 201 which is connected to the steam pipe 100 and is symmetrically distributed, a valve body 209 which is connected to the flow divider 201, a flow collector 202 which is connected to the valve body 209, a collection chamber 203 which is connected to the flow collector 202, a valve seat 206 which is located inside the valve body 209, a valve stem 204 which is rotatably mounted inside the valve seat 206, and a valve leaf 205 which is located on the outer wall of the valve stem 204 and is rotatably mounted inside the valve seat 206;

[0043] A flange 101 is provided at one end of the steam pipe 100, and mounting holes distributed in a circular array are provided inside the flange 101;

[0044] The valve body 209 is provided with a rotating seat 207 at both the front and rear ends, the valve stem 204 is rotatably installed inside the rotating seat 207, and a rotary handle 208 is provided at one end of the valve stem 204;

[0045] Performing use of the adjustment structure 200;

[0046] The steam pipe 100 is connected to the pipeline through a flange 101 to realize the transportation of steam. After the steam enters the steam pipe 100, it is divided into two diversion pipes 201. The gripping handle 208 drives the valve stem 204 to rotate, and then drives the valve leaf 205 to rotate inside the valve seat 206 to control the opening of the valve body 209. The two valve bodies 209 and the diversion pipe 201 share the impact of high-temperature and high-pressure steam, and then enter the loss of a single pipeline and valve group, thereby increasing the service life of the valve group, thereby reducing the maintenance cycle of the valve group, and thereby reducing the maintenance cost.

[0047] Example 2

[0048] See also Figure 1-Figure 5 As shown, this embodiment is based on the embodiment 1 and also includes:

[0049] as well as;

[0050] The nozzle structure 300 includes a mounting sleeve 304 located at one end of the convergence chamber 203, a nozzle 301 located inside the mounting sleeve 304, a narrow nozzle 302 connected to the nozzle 301, a gear ring 309 sleeved on the outer wall of the nozzle 301, a motor 307 fixed on the outer wall of the mounting sleeve 304, and a gear 308 located at the output end of the motor 307 and meshing with the gear ring 309.

[0051] A second rectangular flange 303 is provided at one end of the narrow nozzle 302, and a mounting hole is provided inside the second flange 303;

[0052] A sealing ring 306 is embedded in the inner wall of the nozzle 301, and the nozzle 301 is rotatably installed inside the sealing ring 306;

[0053] The inner wall of one end of the converging chamber 203 is provided with a flow guide scoop 305 located inside the nozzle 301;

[0054] Performing use of the nozzle structure 300;

[0055] The steam enters the convergence chamber 203, and then enters the nozzle 301 and the narrow nozzle 302, injecting the high-pressure steam onto the turbine blades. The narrow nozzle 302 channel gradually shrinks, which pressurizes the steam and helps the worm wheel blades to rotate. When the narrow nozzle 302 is docked with the worm wheel housing, the motor 307 drives the gear 308 to rotate, pushing the gear ring 309 to rotate, driving the nozzle 301 to rotate inside the sealing ring 306, so that the angle of the narrow nozzle 302 is adjusted, which is convenient for the effective docking of the narrow nozzle 302 when installed at different angles, and provides assistance for the installation of the narrow nozzle 302.

[0056] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A narrow cut-off nozzle for turbines, characterized in that: comprising a steam pipe (100); A regulating structure (200), a flow distribution pipe (201) connected to the steam pipe (100) and symmetrically distributed, a valve body (209) connected to the flow distribution pipe (201), a flow collecting pipe (202) connected to the valve body (209), a collecting chamber (203) connected to the flow collecting pipe (202), a valve seat (206) located inside the valve body (209), a valve stem (204) rotatably mounted inside the valve seat (206), and a valve leaf (205) located on the outer wall of the valve stem (204) and rotatably mounted inside the valve seat (206); as well as; The nozzle structure (300) comprises a mounting sleeve (304) located at one end of a convergence chamber (203), a nozzle (301) located inside the mounting sleeve (304), a narrow nozzle (302) connected to the nozzle (301), a gear ring (309) sleeved on the outer wall of the nozzle (301), a motor (307) fixed on the outer wall of the mounting sleeve (304), and a gear (308) located at the output end of the motor (307) and meshing with the gear ring (309).

2. A narrow cut-off nozzle for turbines according to claim 1, characterized in that: A flange 1 (101) is provided at one end of the steam pipe (100), and mounting holes distributed in a ring array are provided inside the flange 1 (101).

3. A narrow cut-off nozzle for turbine according to claim 1, characterized in that: The valve body (209) is provided with a rotating seat (207) at both the front and rear ends. The valve stem (204) is rotatably mounted inside the rotating seat (207). A rotating handle (208) is provided at one end of the valve stem (204).

4. A narrow cut-off nozzle for turbine according to claim 1, characterized in that: A second rectangular flange (303) is provided at one end of the narrow nozzle (302), and a mounting hole is provided inside the second flange (303).

5. A narrow cut-off nozzle for turbine according to claim 1, characterized in that: A sealing ring (306) is embedded in the inner wall of the nozzle (301), and the nozzle (301) is rotatably installed inside the sealing ring (306).

6. A narrow cut-off nozzle for turbine according to claim 1, characterized in that: The inner wall of one end of the converging chamber (203) is provided with a flow guide hopper (305) located inside the nozzle (301).

Images