A self-balancing steam speed regulating valve

Abstract

The present invention discloses a self-balancing steam speed regulating valve, which includes a valve body, including a steam inlet chamber and a steam exhaust chamber; a valve seat connected to the valve body, the valve seat forming a steam passage connecting the steam inlet chamber and the steam exhaust chamber; and a valve core disposed within the steam inlet chamber. The valve core is configured to move axially to close or open the steam passage, and the outer sidewall of the valve core has opposing inclined surfaces along the axial direction of the valve core. The self-balancing steam speed regulating valve provided by this application can solve the technical problem of a large steam pressure difference between the two sides of the valve core existing in the prior art.

Description

Technical Field

[0001] The present application belongs to the technical field of speed regulating valves, and more specifically, relates to a self-balancing steam speed regulating valve. Background Art

[0002] Domestic industrial steam turbines commonly use single-seat ball, disc, or notch valves for speed control valves. While this design offers good sealing, structural limitations result in a significant steam pressure differential across the valve core, placing high demands on both the lifting force and the drive mechanism. Furthermore, during operation, these valves are susceptible to twitching and rotation under the influence of steam flow, leading to wear of mating components and shortening their service life. Some manufacturers and models utilize double-seat valves. While this design significantly reduces the pressure differential across the valve core, lowering both lifting force and the manufacturing cost of the drive mechanism, it suffers from poor sealing performance, significant pressure loss, and inability to eliminate the twitching and rotation of the valve core components during regulation. Consequently, the wear problem remains unresolved and unresolved. As regulating components wear, the stability of the regulating system is significantly impacted, making it unable to accurately respond to regulation commands. Consequently, turbine speed fluctuations become increasingly severe, ultimately impacting the stable operation of the entire unit and the safe and continuous production of the factory. Therefore, addressing these issues is crucial. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a self-balancing steam speed regulating valve to solve the technical problem of a large steam pressure difference on both sides of the valve core in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is to provide a self-balancing steam speed regulating valve, comprising:

[0005] Valve body, including steam inlet chamber and steam exhaust chamber;

[0006] a valve seat connected to the valve body, wherein the valve seat forms a steam channel, and the steam channel communicates with the steam inlet chamber and the steam exhaust chamber;

[0007] A valve core is arranged in the steam inlet chamber. The valve core is used to move along its own axial direction to close or open the steam channel. Along the axial direction of the valve core, the outer side wall of the valve core has relatively arranged inclined surfaces.

[0008] Optionally, the valve core comprises at least a first inclined surface and a second inclined surface arranged opposite to each other, wherein the first inclined surface is used to abut against the valve seat, and the first inclined surface and the second inclined surface are connected by a smooth transition of a circular arc;

[0009] When the first inclined surface is in contact with the valve seat, a gap between at least a portion of the first inclined surface and the valve seat on the exhaust chamber side gradually increases toward the exhaust chamber.

[0010] Optionally, the inclined surface further includes a third inclined surface;

[0011] The sum of the projected area of ​​the third slope in the axial direction of the valve core and the projected area of ​​the portion forming the gap between the first slope and the valve seat in the axial direction of the valve core is equal to the projected area of ​​the second slope in the axial direction of the valve core.

[0012] Optionally, the first inclined surface is a curved surface;

[0013] At least a portion of the sidewall of the steam channel is a curved surface;

[0014] The first inclined surface is used to abut against the arc surface portion of the steam channel.

[0015] Optionally, when the first inclined surface and the steam channel are in contact with each other, an angle A formed between a straight line tangent to both the first inclined surface and the steam channel and the central axis of the valve core is 36.5°.

[0016] Optionally, the radial dimension of the steam channel gradually increases from an end close to the steam inlet chamber to an end close to the steam exhaust chamber.

[0017] Optionally, a middle hole is provided on the valve body, and the valve seat is installed in the middle hole and is interference fit with the hole wall of the middle hole.

[0018] Optionally, the self-balancing steam speed regulating valve further comprises a guide sleeve and a valve cover, wherein the guide sleeve is fixedly connected to the valve cover;

[0019] At least a portion of the valve core extends into the guide sleeve, and the valve core is slidably connected to the guide sleeve.

[0020] Optionally, the self-balancing steam speed regulating valve further includes an anti-rotation part;

[0021] A groove is provided on the outer side wall of the valve core, and the longitudinal direction of the groove is parallel to the axis of the valve core. One end of the anti-rotation part is connected to the guide sleeve, and the other end extends into the groove to prevent the valve core from rotating relative to the guide sleeve along its own circumference.

[0022] Optionally, the anti-rotation component and the guide sleeve are both hardened by nitriding and laser quenching to form a surface hardened wear-resistant layer.

[0023] The beneficial effects of the self-balancing steam speed regulating valve provided by the present application are as follows: compared with the prior art, the self-balancing steam speed regulating valve provided by the present application includes a valve body, a valve seat and a valve core, wherein the valve body includes a steam inlet chamber and a steam exhaust chamber; the valve seat is connected to the valve body and the valve seat forms a steam channel, and the steam channel connects the steam inlet chamber and the steam exhaust chamber; the valve core is arranged in the steam inlet chamber, and the valve core is used to move along its own axial direction to close or open the steam channel, and along the axial direction of the valve core, the outer side wall of the valve core has a relatively set inclined surface. According to the above structure, when the steam entering the steam inlet chamber reaches the outer side wall of the valve core, due to the relatively set side surfaces on the outer side wall of the valve core, the valve core can balance the force along the axial direction after being subjected to the steam pressure, thereby avoiding the formation of a large steam pressure difference on both sides of the valve core, which makes it difficult to lift the valve core, significantly saving energy consumption, and having significant significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A cross-sectional view of the overall structure of a self-balancing steam speed regulating valve provided in an embodiment of the present application;

[0026] Figure 2 Schematic diagram of the matching structure of the valve seat, valve core and guide sleeve provided in the embodiment of the present application;

[0027] Among them, the figure marks in the figure are: 100, valve body; 101, steam inlet chamber; 102, steam exhaust chamber; 200, valve seat; 201, steam channel; 300, valve core; 301, first inclined surface; 302, second inclined surface; 303, third inclined surface; 304, groove; 400, valve stem; 500, actuator; 600, guide sleeve; 700, valve cover; 800, anti-rotation part. Implementation Method

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0032] See also Figure 1 and Figure 2 , a self-balancing steam speed regulating valve provided in an embodiment of the present application is now described. The self-balancing steam speed regulating valve includes a valve body 100, a valve seat 200 and a valve core 300, wherein the valve body 100 includes a steam inlet chamber 101 and a steam exhaust chamber 102, the steam inlet chamber 101 is used to allow steam to enter, and the steam exhaust chamber 102 is used to exhaust steam. The valve seat 200 is connected to the valve body 100, and the valve seat 200 forms a steam channel 201, which connects the steam inlet chamber 101 and the steam exhaust chamber 102; the valve core 300 is arranged in the steam inlet chamber 101. In this embodiment, the valve core 300 is used to move along its own axial direction to close or open the steam channel 201. It can be understood that the self-balancing steam speed regulating valve provided in this embodiment adjusts the opening of the steam channel 201 by moving the valve core 300 to achieve the purpose of adjusting the steam flow. Generally speaking, in order to achieve the movement of the valve core 300, in addition to the structures of the valve body 100, valve seat 200 and valve core 300 described in this embodiment, the speed control valve also includes structures such as a valve stem 400 and an actuator 500. The valve core 300 is connected to the external actuator 500 through the valve stem 400, and the valve stem 400 is driven to move by the actuator 500, thereby driving the valve core 300 to move, so as to achieve the technical purpose of closing or opening the steam channel 201 and changing the steam intake of the turbine to meet the required power and speed output requirements.

[0033] In this embodiment, along the axial direction of the valve core 300, the outer side wall of the valve core 300 has relatively arranged inclined surfaces. According to this structure, the axial front and rear forces on the valve core 300 are symmetrical, so most of the steam pressure on the two axial front and rear inclined surfaces of the valve core 300 can offset each other. This can greatly reduce the lifting force of the valve core 300, especially the lifting force required when opening from a closed state, which can reduce the selection specifications and cost of the actuator 500 and improve control accuracy. Because the steam pressure acting on this valve core 300 structure is relatively small, in other embodiments, in order to ensure the sealing performance of the valve core 300, when designing the inclined surfaces, a certain sealing pressure can be appropriately maintained on the valve core 300, or a certain sealing force can be provided by the driving mechanism. It can be flexibly set according to actual working conditions.

[0034] In some embodiments of this application, please refer to Figure 1 and Figure 2 The valve core 300 includes at least a first inclined surface 301 and a second inclined surface 302 disposed opposite each other, wherein the first inclined surface 301 is used to abut the valve seat 200, and the first inclined surface 301 and the second inclined surface 302 are smoothly connected by a circular arc. When the first inclined surface 301 and the valve seat 200 are in abutment, a gap between at least a portion of the first inclined surface 301 and the valve seat 200 located on the exhaust chamber 102 side gradually increases toward the exhaust chamber 102. According to the structure of the self-balancing steam speed regulating valve provided in this embodiment, the first inclined surface 301 is disposed at the end of the valve core 300. The gap formed by the first inclined surface 301 and the valve seat 200 facilitates the entry of steam and generates steam pressure on the first inclined surface 301. And because the first inclined surface 301 is arranged at the end of the valve core 300, the axial thrust generated by the steam on the first inclined surface 301 is in opposite direction to the axial thrust generated by the steam on the second inclined surface 302, thereby offsetting a part of the axial thrust generated by the steam on the second inclined surface 302, and the self-balancing effect of the valve core 300 is better. At the same time, the first inclined surface 301 and the second inclined surface 302 are connected by a smooth transition design of a circular arc. After the valve core 300 is opened, the steam flow is smooth, avoiding turbulence and turbulence in the steam flow, and effectively reducing the vibration or twitching of the valve core 300, which is conducive to ensuring the stability and reliability of the speed control valve and ensuring control accuracy.

[0035] Based on the above embodiment with the first inclined surface 301 and the second inclined surface 302, see Figure 1 and Figure 2In this embodiment, the inclined surface also includes a third inclined surface 303. The sum of the projected area of ​​the third inclined surface 303 in the axial direction of the valve core 300 and the projected area of ​​the portion of the valve core 300 that forms the gap between the first inclined surface 301 and the valve seat 200 in the axial direction of the valve core 300 is equal to the projected area of ​​the second inclined surface 302 in the axial direction of the valve core 300. Due to the influence of machining errors, an error that does not exceed the design requirements is allowed. Because the axial pressure exerted on the valve core 300 is closely related to the projected area of ​​the inclined surface in the axial direction, when the sum of the projected areas of the first inclined surface 301 and the third inclined surface 303 that effectively act on the valve core 300 in the axial direction is equal to the projected area of ​​the second inclined surface 302 in the axial direction of the valve core 300, the force exerted on the valve core 300 in its own axial direction is also in a balanced state.

[0036] In some embodiments of this application, please refer to Figure 1 and Figure 2 The first inclined surface 301 is an arcuate surface; at least a portion of the sidewall of the steam passage 201 is an arcuate surface; the first inclined surface 301 is configured to abut the arcuate portion of the steam passage 201. According to the structure of the self-balancing steam speed regulating valve provided in this embodiment, both opposing abutting surfaces of the first inclined surface 301 and the valve seat 200 are arcuate surfaces. This approach is significant in that, on the one hand, the first inclined surface 301 can more easily abut the valve seat 200, forming a tight and reliable seal. On the other hand, it also creates an arc-shaped opening between the first inclined surface 301 and the valve seat 200, facilitating steam inlet. Experimental comparisons show that when the first inclined surface 301 and the steam passage 201 are in contact, the valve core 300 achieves a good self-balancing effect when the angle A between a line tangent to both the first inclined surface 301 and the steam passage 201 and the central axis of the valve core 300 is 36.5°. Of course, in other embodiments of the present application, this angle can be modified to other angles, allowing for flexibility based on actual on-site operating conditions.

[0037] In some embodiments of this application, please refer to Figure 1 and Figure 2 The radial dimension of the steam channel 201 gradually increases from the end closest to the steam inlet chamber 101 to the end closest to the steam exhaust chamber 102. This structure helps reduce steam pressure loss and excitation forces, resulting in excellent shock resistance, minimal steam flow pulsation, and improved stability. Preferably, in other embodiments, the profile of the steam channel 201 is a Venturi-style diffuser structure, achieving the same technical effects as this embodiment and will not be further described.

[0038] In some embodiments of this application, please refer to Figure 1 and Figure 2A middle hole is provided on the valve body 100, and the valve seat 200 is installed in the middle hole and has an interference fit with the hole wall of the middle hole. Its structure is more reliable and can effectively prevent the valve seat 200 from loosening and shaking.

[0039] In some embodiments of this application, please refer to Figure 1 and Figure 2 The self-balancing steam speed regulating valve further comprises a guide sleeve 600 and a valve cover 700. The guide sleeve 600 is fixedly connected to the valve cover 700. At least a portion of the valve core 300 extends into the guide sleeve 600. The valve core 300 is slidably connected to the guide sleeve 600. The self-balancing steam speed regulating valve further comprises an anti-rotation part 800. A groove 304 is provided on the outer wall of the valve core 300. The groove 304 is longitudinally parallel to the axis of the valve core 300. One end of the anti-rotation part 800 is connected to the guide sleeve 600, and the other end extends into the groove 304 to prevent the valve core 300 from rotating relative to the guide sleeve 600 along its own circumferential direction. By adopting the structure of a self-balancing steam speed regulating valve provided in this embodiment, the axial twitching and circumferential swing of the valve core 300 at low load of the steam turbine can be effectively reduced, thereby avoiding rapid wear of the regulating part and speed fluctuation, so as to ensure flexible regulating action and safe and reliable operation of the unit.

[0040] In some embodiments of this application, please refer to Figure 1 and Figure 2 The anti-rotation member 800 and guide sleeve 600 are both hardened using a nitriding and laser quenching process to form a surface-hardened, wear-resistant layer. It is understood that to reduce wear on mating components and increase service life, the anti-rotation member 800, guide sleeve 600, valve stem 400, and other components can also use nitriding and laser quenching hardening processes, which will not be further described.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A self-balancing steam speed regulating valve, characterized in that: include: A valve body (100) comprising a steam inlet chamber (101) and a steam exhaust chamber (102); a valve seat (200) connected to the valve body (100), wherein the valve seat (200) forms a steam channel (201), and the steam channel (201) communicates with the steam inlet chamber (101) and the steam exhaust chamber (102); A valve core (300) is disposed in the steam inlet chamber (101), the valve core (300) being used to move along its own axial direction to close or open the steam passage (201), and an outer side wall of the valve core (300) having oppositely disposed inclined surfaces along the axial direction of the valve core (300); The valve core (300) comprises at least a first inclined surface (301) and a second inclined surface (302) arranged opposite to each other, wherein the first inclined surface (301) is used to abut against the valve seat (200), and the first inclined surface (301) and the second inclined surface (302) are connected by a smooth transition of a circular arc; When the first inclined surface (301) and the valve seat (200) are in contact, a gap between at least a portion of the first inclined surface (301) and the valve seat (200) located on one side of the exhaust chamber (102) gradually increases toward the exhaust chamber (102); The inclined surface further includes a third inclined surface (303); The sum of the projected area of ​​the third inclined surface (303) in the axial direction of the valve core (300) and the projected area of ​​the portion of the first inclined surface (301) forming the gap with the valve seat (200) in the axial direction of the valve core (300) is equal to the projected area of ​​the second inclined surface (302) in the axial direction of the valve core (300); The first inclined surface (301) is a curved surface; At least a portion of the side wall of the steam channel (201) is a curved surface; The first inclined surface (301) is used to abut against the arc surface portion of the steam channel (201).

2. The self-balancing steam speed regulating valve according to claim 1, characterized in that: When the first inclined surface (301) and the steam channel (201) are in contact, an angle A formed between a straight line tangent to both the first inclined surface (301) and the steam channel (201) and the central axis of the valve core (300) is 36.5°.

3. The self-balancing steam speed regulating valve according to any one of claims 1 to 2, characterized in that: The radial dimension of the steam channel (201) gradually increases from an end close to the steam inlet chamber (101) to an end close to the steam exhaust chamber (102).

4. The self-balancing steam speed regulating valve according to claim 3, characterized in that: The valve body (100) is provided with a middle hole, and the valve seat (200) is installed in the middle hole and is interference-fitted with the hole wall of the middle hole.

5. The self-balancing steam speed regulating valve according to claim 1, characterized in that: The self-balancing steam speed regulating valve further comprises a guide sleeve (600) and a valve cover (700), wherein the guide sleeve (600) is fixedly connected to the valve cover (700); At least a portion of the valve core (300) extends into the guide sleeve (600), and the valve core (300) is slidably connected to the guide sleeve (600).

6. The self-balancing steam speed regulating valve according to claim 5, characterized in that: The self-balancing steam speed regulating valve further includes an anti-rotation part (800); A groove (304) is provided on the outer wall of the valve core (300), and the groove (304) is longitudinally parallel to the axis of the valve core (300). One end of the anti-rotation member (800) is connected to the guide sleeve (600), and the other end extends into the groove (304) to prevent the valve core (300) from rotating along its own circumference relative to the guide sleeve (600).

7. The self-balancing steam speed regulating valve according to claim 6, characterized in that: The anti-rotation component (800) and the guide sleeve (600) are both hardened using a nitriding and laser quenching process to form a surface hardened wear-resistant layer.

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