A quick closing valve

Abstract

The application discloses a quick closing valve and belongs to the field of hydraulic valves. The quick closing regulating valve comprises a valve body, a valve cover, a valve core and a valve rod. The valve body is divided into three sections, i.e. an upper section, a middle section and a lower section, and comprises a steam inlet cavity, a steam outlet cavity and a valve seat. The valve seat is located in the steam inlet cavity. The valve rod penetrates through the three sections of the valve body, and the valve core is arranged at the lower end of the valve rod. The quick closing valve has the functions of quick closing, warming and regulating the steam inlet flow. Steam enters the steam inlet cavity, the quick closing valve is slowly opened, the warming is performed by using the small gap between the valve seat and the valve core, and then the steam inlet flow is regulated by regulating the opening degree of the quick closing valve and gradually increasing or reducing the flow area between the valve seat and the valve core. The quick closing valve can be slowly opened or closed by a hand wheel, and can be quickly closed by a guide key and a handle.

Description

Technical Field

[0001] This invention relates to a quick-closing valve, belonging to the field of steam valves. Background Technology

[0002] A steam turbine is a rotary steam power plant in which high-temperature, high-pressure steam is injected onto blades that house a rotor, causing the rotor to rotate and perform work. Steam turbines are typically equipped with quick-closing valves and regulating valves. Generally, the quick-closing valve and regulating valve are relatively independent, although they can also be integrated, but this design is more complex. Furthermore, the independent quick-closing and regulating structures occupy more space and result in higher pressure losses. Summary of the Invention

[0003] This invention provides a quick-closing valve that integrates regulation and quick-closing functions and structure, effectively reducing space occupation and pressure loss.

[0004] The objective of this invention is achieved as follows: It includes a handwheel 1, a spring 2, an upper valve body 3, a spring cover 4, an upper valve sleeve 5, a guide key and handle 6, a middle valve body 7, a valve cover 8, a filter screen 9, a lower valve sleeve 10, a valve stem 11, a lower valve body 12, a connecting block 13, a valve core 14, and a valve seat 15. The handwheel 1 is connected to the valve stem 11 and is located on the upper exterior of the upper valve body 3, used to rotate the valve stem 11. The spring 2 is located inside the upper valve body 3 and is under pressure. When the handle 6 moves downward, the guide key 6 rotates, and the spring force acts on the spring cover 4, causing the valve core 14 to move downward quickly, completing the quick-closing operation. The valve body mainly consists of an upper valve body 3, a middle valve body 7, and a lower valve body 12. The upper valve body contains the spring 2, the spring cover 4, and the upper valve sleeve 5; the middle valve body contains the guide key and handle 6; and the lower valve body contains the connecting block 13 and the valve core 14. Both the inlet and outlet chambers are located in the lower valve body. The spring cover 4 is located between the spring and the upper valve sleeve 5. The upper valve sleeve 5 is located between the spring cover 4 and the lower valve sleeve 10, and contacts the external thread of the valve stem 11 through its internal thread. It is limited by the guide key 6. The guide key and handle 6 allow the guide key to rotate by turning the handle. The valve cover 8 is located between the middle valve body 7 and the lower valve body 12, and is used to fix the filter screen 9. The filter screen 9 is located inside the steam inlet chamber. The lower valve sleeve 10 is installed at the lower part of the middle valve body 7, and the valve stem 11 passes through the lower valve sleeve 10. The valve stem 11 runs through all three valve bodies, from the handwheel 1 at the top to the valve core 14 at the bottom. The valve core 14 is located at the lower end of the valve stem and contacts the valve seat 15 when closed. The valve seat is located in the lower valve body 12 (15) and contacts the valve core 14 when closed.

[0005] Furthermore, the handwheel 1 is connected to the valve stem 11 via a keyway and secured by a clamping nut.

[0006] Furthermore, the spring cover 4 has fixed blocks at both the top and bottom, a guide key on the top of the cover, and a corresponding guide groove on the upper fixed block.

[0007] Furthermore, the upper valve sleeve 5 has a keyway with the same shape as the guide key 6. When the upper valve sleeve 5 moves upward to the limit, it is in its initial position to cooperate with the guide key 6. The position difference between the upper valve sleeve 5 and the lower valve sleeve 10 is greater than the position difference between the valve core 14 and the valve seat 15.

[0008] Furthermore, the guide key 6 serves to limit the upper valve sleeve 5 in its initial position. When the handle 6 is turned, the guide key 6 should be completely disengaged from the upper valve sleeve 5.

[0009] Furthermore, the upper half of the filter screen 9 is inserted into the valve cover 8 and the lower valve body 12, and the lower half is inserted into the valve seat 15 and the lower valve body 12.

[0010] Furthermore, the lower valve sleeve 10 is equipped with a steam seal to prevent steam leakage.

[0011] Furthermore, the sealing surface of the valve core 14 is ground to fit with the valve seat 15. The outer diameter of the lower vertical section of the valve core 14 is slightly smaller than the inner diameter of the valve seat 15, and the small gap is only used for warm-up. The outer diameter of the lower shrinkage section of the valve core 14 gradually decreases to increase the flow area and increase the steam flow rate.

[0012] Compared with existing technologies, the advantages of this invention are: it combines a traditional quick-closing valve and a regulating valve into one, resulting in a smaller size. Steam enters the steam turbine through a single flow channel, resulting in less pressure loss and higher efficiency. The valve has a simple structure and is easy to manufacture. Attached Figure Description

[0013] Figure 1 This is a quick-closing valve as described in this invention.

[0014] In the diagram: 1. Handwheel; 2. Spring; 3. Upper valve body; 4. Spring cover; 5. Upper valve sleeve; 6. Guide key and handle; 7. Middle valve body; 8. Valve cover; 9. Filter screen; 10. Lower valve sleeve; 11. Valve stem; 12. Lower valve body; 13. Connecting block; 14. Valve core; 15. Valve seat. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] This invention discloses a quick-closing valve. A handwheel 1 is connected to a valve stem 11 and located on the upper exterior of the upper valve body 3, used to rotate the valve stem 11. A spring 2 is located inside the upper valve body 3 and is under pressure. When the handle 6 moves downward, the guide key 6 rotates, and the spring force acts on the spring cover 4, causing the valve core 14 to move rapidly downward, completing the quick-closing operation. The valve body mainly consists of an upper valve body 3, a middle valve body 7, and a lower valve body 12. The upper valve body contains the spring 2, the spring cover 4, and the upper valve sleeve 5. The middle valve body contains the guide key and the handle 6. The lower valve body contains the connecting block 13 and the valve core 14. Both the inlet and outlet chambers are located in the lower valve body. The spring cover 4 is located between the spring and the upper valve sleeve 5. The upper valve sleeve 5 is located between the spring cover 4 and the lower valve sleeve 10, contacting the external thread of the valve stem 11 through its internal thread, and is limited by the guide key 6. The guide key and handle 6 allow the guide key to rotate by moving the handle. The valve cover 8 is located between the middle valve body 7 and the lower valve body 12, and is used to fix the filter screen 9. The filter screen 9 is located inside the steam inlet chamber. The lower valve sleeve 10 is installed at the lower part of the middle valve body 7, and the valve stem 11 passes through the lower valve sleeve 10. The valve stem 11 runs through the three valve bodies, from the handwheel 1 at the top to the valve core 14 at the bottom. The valve core 14 is located at the lower end of the valve stem and contacts the valve seat 15 when closed. The valve seat is located in the lower valve body 12 of valve 15 and contacts the valve core 14 when closed.

[0017] Workflow:

[0018] Rotate the handwheel to open the quick-closing valve until steam enters the steam turbine to warm up the machine.

[0019] Continue rotating the handwheel to adjust the steam flow.

[0020] Rotate the handwheel in the opposite direction to close the quick-closing valve or pull the handle to close it quickly.

[0021] In summary, this invention discloses a quick-closing valve, belonging to the field of hydraulic valves. The quick-closing regulating valve includes a valve body, valve cover, valve core, and valve stem. The valve body is divided into three sections: upper, middle, and lower, including an inlet chamber, an outlet chamber, and a valve seat, with the valve seat located in the inlet passage. The valve stem passes through all three sections of the valve body, and the valve core is mounted at the lower end of the valve stem. In addition to its quick-closing function, the quick-closing valve also includes warm-up and steam flow regulation functions. Steam enters from the inlet chamber, slowly opening the quick-closing valve. Warm-up is achieved using the small gap between the valve seat and the valve core. The steam flow is then regulated by gradually increasing or decreasing the flow area between the valve seat and the valve core through adjusting the valve opening. The quick-closing valve can be slowly opened or closed using a handwheel, and can also be quickly closed using a guide key and a handle.

Claims

1. A quick-closing valve, characterized in that: The valve body includes a handwheel (1), a spring (2), an upper valve body (3), a spring cover (4), an upper valve sleeve (5), a guide key and a handle, a middle valve body (7), a valve cover (8), a filter screen (9), a lower valve sleeve (10), a valve stem (11), a lower valve body (12), a connecting block (13), a valve core (14), and a valve seat (15). The handwheel (1) is connected to the valve stem (11) and is located on the upper outside of the upper valve body (3) for rotating the valve stem (11). The spring (2) is located inside the upper valve body (3) and is under pressure. When the handle moves downward, the guide key rotates, and the spring force acts on the spring cover (4), causing the valve core (14) to move downward quickly and complete the quick closing. The valve body is mainly composed of an upper valve body (3), a middle valve body (7), and a lower valve body (12). The upper valve body contains the spring (2), the spring cover (4), and the upper valve sleeve (5). The middle valve body contains the guide key and the handle. The lower valve body contains the valve core and the handle. Includes connecting block (13) and valve core (14), with both inlet and outlet chambers located in the lower valve body; spring cap (4) is located between the spring and upper valve sleeve (5); upper valve sleeve (5) is located between spring cap (4) and lower valve sleeve (10), and contacts the external thread of valve stem (11) through internal thread, and is limited by guide key; guide key and handle, the guide key is rotated by turning the handle; valve cover (8) is located between middle valve body (7) and lower valve body (12), Used to fix the filter screen (9); the filter screen (9) is located in the steam inlet chamber; the lower valve sleeve (10) is installed in the lower part of the middle valve body (7), and the valve stem (11) passes through the lower valve sleeve (10); the valve stem (11) passes through the three valve bodies, from the handwheel (1) to the valve core (14); the valve core (14) is located at the lower end of the valve stem and contacts the valve seat (15) when closed; the valve seat is located in the lower valve body (12) of (15) and contacts the valve core (14) when closed.

2. The quick-closing valve according to claim 1, characterized in that: The handwheel (1) is connected to the valve stem (11) via a keyway and secured by a clamping nut.

3. The quick-closing valve according to claim 1, characterized in that: The spring cap (4) has fixed blocks at both the top and bottom, and there is a guide key on the top of the cap. The upper fixed block has a corresponding guide groove.

4. A quick-closing valve according to claim 1, characterized in that: The upper valve sleeve (5) has a keyway, the shape of which is consistent with the guide key. The upper valve sleeve (5) moves upward to the limit position, which is its initial position for cooperating with the guide key. The position difference between the upper valve sleeve (5) and the lower valve sleeve (10) is greater than the position difference between the valve core (14) and the valve seat (15).

5. A quick-closing valve according to claim 1, characterized in that: The guide key in the initial position serves to limit the upper valve sleeve (5). When the handle is turned, the guide key should be completely disengaged from the upper valve sleeve (5).

6. A quick-closing valve according to claim 1, characterized in that: The upper half of the filter screen (9) is inserted into the valve cover (8) and the lower valve body (12), and the lower half is inserted into the valve seat (15) and the lower valve body (12).

7. A quick-closing valve according to claim 1, characterized in that: The lower valve sleeve (10) is equipped with a steam seal to prevent steam leakage.

8. A quick-closing valve according to claim 1, characterized in that: The sealing surface of the valve core (14) is ground and fitted with the valve seat (15). The outer diameter of the lower vertical section of the valve core (14) is slightly smaller than the inner diameter of the valve seat (15), and the gap is small and only used for warm-up. The outer diameter of the lower shrinkage section of the valve core (14) gradually decreases to increase the flow area and increase the steam flow.

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