阅读说明：本技术 一种宽负荷自适应的变通流面积节流稳压结构及方法 (Wide-load self-adaptive variable flow area throttling and pressure stabilizing structure and method ) 是由 郑天帅 余小兵 赵承志 马汀山 王伟 杨利 刘学亮 刘永林 王东晔 李�昊 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种宽负荷自适应的变通流面积节流稳压结构及方法,该结构在阀体内固定设置节流环,节流阀芯为锥台结构,使得节流阀芯的侧壁面和节流环的型线配合,改变通流面积,实现对不同工况下的压降幅度调节,来实现宽负荷工况下的自适应变通流面积节流稳压。该结构可以改善变工况下的流体压力大幅波动、管路设备运行工况偏离设计点的问题,例如高压水源在变工况下的压力波动大,其管路系统上的调节阀存在阀芯压降大、运行工况恶劣的问题,不利于系统的稳定控制和调节。(The invention discloses a wide-load self-adaptive variable flow area throttling pressure stabilizing structure and a method. The structure can improve the problems that the fluid pressure greatly fluctuates under variable working conditions and the operation working condition of the pipeline equipment deviates from the design point, for example, the pressure fluctuation of a high-pressure water source is large under the variable working conditions, and the regulating valve on the pipeline system has the problems of large valve core pressure drop and severe operation working conditions, so that the stable control and regulation of the system are not facilitated.)

1. A wide-load self-adaptive variable-flow-area throttling and pressure stabilizing structure is characterized by comprising a valve body (6), wherein a throttling valve core (1), a throttling ring (2) and a fixing device which are coaxial are arranged in the valve body (6);

the throttle valve core (1) and the fixing device are respectively arranged at two sides of the throttle ring (2), the fixing device is connected with the central part of the throttle valve core (1) through a connecting piece, a limiting spring (4) is sleeved and rotated on the connecting piece, and the free length of the limiting spring (4) is greater than that of the connecting piece;

the two side surfaces of the throttling valve core (1) are symmetrically and coaxially frustum structures, and the sections of the two frustum structures are gradually reduced from the inside of the throttling valve core (1) to the outside of the two sides;

the width of the radial section of the throttle ring (2) is gradually reduced from the outer ring of the throttle ring (2) to the inner ring;

the diameter of the throttle valve core (1) is smaller than that of the outer ring of the throttle ring (2), and the side wall surface of the frustum structure is matched with the side surface of the throttle ring (2).

2. A wide-load adaptive variable flow area throttling and pressure stabilizing structure as claimed in claim 1, characterized in that the fixing device is a support frame (7), and the outer end part of the support frame (7) is fixedly connected with the inner side wall of the valve body (6).

3. A wide-load adaptive variable flow area throttling and pressure stabilizing structure as claimed in claim 1, characterized in that said connecting member is a guide bolt (3), and said guide bolt (3) is connected with the central part of the supporting frame (7) through a fastening nut (5).

4. A wide load adaptive variable flow area throttling and pressure stabilizing structure according to claim 1, characterized in that one end of the valve body (6) is an inlet end (601), the other end is an outlet end (603), and the part between the inlet end (601) and the outlet end (603) is a central part (602).

5. A wide-load adaptive variable flow area throttling pressure stabilizing structure according to claim 4, characterized in that a throttling valve core (1), a throttling ring (2) and a fixing device are arranged in the central part (602) in sequence from the inlet end (601) to the outlet end (603).

6. The wide-load self-adaptive variable flow area throttling pressure stabilizing structure is characterized in that the valve body (6) is provided with a throttling ring (2) on each side of the throttling valve core (1), and a fixing device is arranged on the outer side of each throttling ring (2); the two throttle rings (2) are symmetrical relative to the plane of the throttle valve core (1), and the two fixing devices are symmetrical relative to the plane of the throttle valve core (1).

7. The wide-load adaptive variable flow area throttling pressure stabilizing structure as claimed in claim 1, characterized in that the plane of the throttling valve core (1) is the central plane of the valve body (6) in the length direction.

8. The wide-load self-adaptive variable flow area throttling and pressure stabilizing structure as claimed in claim 1, characterized in that the outer ring of the throttling ring (2) is fixedly connected with the inner side wall of the valve body (6).

9. A pressure stabilizing method based on a wide-load self-adaptive variable flow area throttling pressure stabilizing structure as claimed in any one of claims 1 to 8, characterized in that fluid enters from one end of the valve body (6), pushes the throttling valve core (1) to move along the axis in the direction of the throttling ring (2), and pressure is stabilized on the fluid through the cooperation of the side surface of the throttling valve core (1) and the side surface of the throttling ring (2).

Technical Field

The invention belongs to the technical field of thermal power generation and atomic power generation, and particularly relates to a wide-load self-adaptive variable flow area throttling and voltage stabilizing structure and method.

Background

In recent years, the installed scale of new wind power and photovoltaic energy is continuously increased, the integral power receiving scale is greatly improved, and the peak regulation contradiction of a power grid is increasingly prominent. In order to relieve the contradiction of the difference adjustment gap and improve the peak adjustment capability of the master control unit, each local dispatching control center continuously establishes and perfects the deep peak adjustment technical specification on the basis of summarizing the deep peak adjustment work. Some regions have required the peak regulation depth of 30 ten thousand kilowatts and above for the common coal-fired generating set to reach 40% of the rated output of the set.

At present, various domestic power plants select a reasonable steam extraction steam source scheme according to the requirements of user steam parameters, and main steam extraction, cold steam extraction again, hot steam extraction again, communicating pipe steam extraction and the like are common. With the continuous improvement of the requirement of deep peak regulation, the low-load operation of the unit becomes a normal state, the parameters of cold re-extraction and hot re-extraction are also greatly reduced during the deep peak regulation, the extraction parameters of a plurality of power plants can not meet the steam demand of industrial users, and then the steam source with higher parameters is considered and selected.

In order to match with a steam source with higher parameters, the water source selection pressure of the temperature-reducing water also needs to be correspondingly improved, the common temperature-reducing water source used for steam supply in the industry of 2MPa and above can be a tap of a water-feeding pump, however, along with the increase of steam supply flow and the increasingly strict requirement of deep peak regulation, the tap of the water-feeding pump is difficult to meet the requirements on flow and deep peak regulation, and the temperature-reducing water source needs to be led out from the outlet of the water-feeding pump.

In the conventional operation process of the unit, the outlet pressure of the water feeding pump is usually up to 20-30 MPa, taking a subcritical unit as an example, under the normal operation working condition, the outlet pressure of the water feeding pump is basically 8-23 MPa, and the variation amplitude is large; in addition, the steam flow rate of industrial steam supply is influenced by the steam demand of end users and the process flow in the day, and the change is also large. After the temperature-reducing water is led out from the outlet of the water supply pump, the pressure change range of the temperature-reducing water is very large, so that great difficulty is caused for stable adjustment of temperature-reducing water flow and good atomization of a temperature-reducing water nozzle, the temperature-reducing water adjusting valve needs to bear great pressure drop, the pressure drop changes very violently under different loads, and the operating condition of the adjusting valve is relatively severe.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a wide-load self-adaptive variable flow area throttling and pressure stabilizing structure and method so as to solve the problems of large pressure fluctuation of a high-pressure water source under variable working conditions, large pressure drop of an adjusting valve core and severe operating conditions.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a wide-load self-adaptive variable flow area throttling pressure stabilizing structure comprises a valve body, wherein a throttling valve core, a throttling ring and a fixing device which are coaxial are arranged in the valve body;

the throttle valve core and the fixing device are respectively arranged at two sides of the throttle ring, the fixing device is connected with the central part of the throttle valve core through a connecting piece, a limiting spring is sleeved on the connecting piece, and the free length of the limiting spring is greater than that of the connecting piece;

the two side surfaces of the throttling valve core are symmetrically and coaxially frustum structures, and the sections of the two frustum structures are gradually reduced from the inside of the throttling valve core to the outside of the two sides;

the width of the radial section of the throttling ring is gradually reduced from the outer ring to the inner ring of the throttling ring;

the diameter of the throttling valve core is smaller than that of the throttling ring outer ring, and the side wall surface of the frustum structure is matched with the side surface of the throttling ring.

The invention is further improved in that:

preferably, the fixing device is a support frame, and the outer end part of the support frame is fixedly connected with the inner side wall of the valve body.

Preferably, the connecting piece is a guide bolt, and the guide bolt is connected with the central part of the support frame through a fastening nut.

Preferably, one end of the valve body is an inlet end, the other end of the valve body is an outlet end, and the part between the inlet end and the outlet end is a central part.

Preferably, a throttle valve core, a throttle ring and a fixing device are sequentially arranged in the central part from the inlet end to the outlet end.

Preferably, the valve body is provided with a throttle ring on each of two sides of the throttle valve core, and a fixing device is arranged on the outer side of each throttle ring; the two throttle rings are symmetrical relative to the plane where the throttle valve core is located, and the two fixing devices are symmetrical relative to the plane where the throttle valve core is located.

Preferably, the plane on which the throttle valve core is located is a central plane in the length direction of the valve body.

Preferably, the outer ring of the throttle ring is fixedly connected with the inner side wall of the valve body.

According to the pressure stabilizing method of the wide-load self-adaptive variable flow area throttling pressure stabilizing structure, fluid enters from one end of the valve body, the throttling valve core is pushed to move along the axis in the direction of the throttling ring, and the fluid is stabilized through the matching of the side surface of the throttling valve core and the side surface of the throttling ring.

Compared with the prior art, the invention has the following beneficial effects:

the invention discloses a wide-load self-adaptive variable flow area throttling and pressure stabilizing structure, which is characterized in that a throttling ring is fixedly arranged in a valve body, and a throttling valve core is of a frustum structure, so that the side wall surface of the throttling valve core is matched with the molded line of the throttling ring, the flow area is changed, the pressure drop amplitude under different working conditions is adjusted, and the self-adaptive variable flow area throttling and pressure stabilizing under the wide-load working condition is realized. The structure can improve the problems that the fluid pressure greatly fluctuates under variable working conditions and the operation working condition of the pipeline equipment deviates from the design point, for example, the pressure fluctuation of a high-pressure water source is large under the variable working conditions, and the regulating valve on the pipeline system has the problems of large valve core pressure drop and severe operation working conditions, so that the stable control and regulation of the system are not facilitated. The structure has strong adaptability to the parameters of variable working conditions, can realize self-adaptive pressure stabilization regulation of fluid in a certain range, and does not need to be specially controlled and regulated; the structure does not need to be provided with a driving mechanism, so that the corresponding investment cost can be reduced; the power cable, the control cable and other gas sources or driving oil do not need to be led and connected additionally, and the system is simple; the structural valve body has no special requirements on the field environment, does not need to replace or specially design a pipeline, and can realize the functions by additionally installing the device on the field; the whole valve body is simple to operate and maintain, no obvious equipment leakage point exists, only regular inspection is needed, and the overhauling workload is reduced.

Furthermore, the fixing device is a support frame, the outer end part of the support frame is fixedly connected with the inner side wall of the valve body, and therefore the support frame can provide enough axial movement supporting force for the throttle valve core.

Furthermore, the connecting piece is a guide bolt and is connected with the fixing device through a fastening nut, so that the throttle valve core can move along the axis when moving.

Furthermore, the diameter of the outer end part of the frustum structure is smaller than the diameter of the outer ring of the throttling ring, so that the throttling valve core can be matched with the molded line of the throttling ring.

Furthermore, one embodiment of the invention is that a throttle valve core, a throttle ring and a fixing device are arranged, and the throttle valve is a one-way valve.

Furthermore, another embodiment of the invention is that a throttle valve core is arranged at the central part, a throttle ring and a fixing device are respectively arranged at two sides of the throttle valve core, the structure enables two ends of the valve body to be inlet ends, and the other end automatically becomes an outlet end, and the structure is a two-way valve.

The invention also discloses a pressure stabilizing method of the wide-load self-adaptive variable flow area throttling pressure stabilizing structure, an annular flow area with a variable flow area is formed between the pressure stabilizing method and a fixed throttling ring through the axial movement of the self-adaptive throttling valve core, and fluid flows through the annular flow area to reduce pressure; the flow area is changed through the molded line fit between the self-adaptive throttling valve core and the fixed throttling ring, so that the pressure drop amplitude under different working conditions is adjusted; when the force applied to the valve core by the self-adaptive limiting spring is balanced with the force applied to the valve core under the action of fluid, the method performs model selection design on the molded lines and parameters of the self-adaptive throttling valve core, the fixed throttling ring and the self-adaptive limiting spring by researching the working conditions under different flow rates and pressures.

Drawings

FIG. 1 is an axial cross-sectional view of the structure of example 1;

FIG. 2 is a schematic sectional side view of the structure of example 1;

FIG. 3 is a schematic sectional view in elevation of the structure of example 1;

FIG. 4 is an external front view of a pressure stabilizing structure of embodiment 2;

FIG. 5 is an external isometric view of the pressure stabilization construct of example 2;

fig. 6 is a schematic front sectional view of a voltage stabilization structure according to embodiment 2;

FIG. 7 is a schematic sectional view of the voltage stabilization structure of example 2;

fig. 8 is a schematic sectional side view of a pressure stabilization structure of embodiment 2.

Wherein, 1-throttle valve core; 2-a restrictor ring; 3-a guide bolt; 4-a limit spring; 5-fastening a nut; 6-valve body; 7-a support frame.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A wide-load self-adaptive variable flow area throttling pressure stabilizing structure comprises a valve body throttling valve core 1, a throttling ring 2, a guide bolt 3, a limiting spring 4, a fastening nut 5, a valve body 6 and a supporting frame 7.

Example 1

Referring to fig. 1, 2 and 3, the valve body 6 is a tubular structure, and is divided into an inlet end 601, a central portion 602 and an outlet end 603 along the length direction, wherein the inlet end 601, the central portion 602 and the outlet end are integrally connected and coaxial, the central surface is at the center line of the length direction, and the diameter of the central portion 602 is larger than that of the inlet end 601. So that the throttle valve cartridge 1, the throttle ring 2, the guide bolt 3, the limit spring 4 and the fastening nut 5 can be placed in the center portion 602.

In the middle portion 602, a throttle valve cartridge 1, a throttle ring 2, and a support bracket 7 are sequentially disposed in a direction from an inlet end 601 to an outlet end 603 of the valve body 6, i.e., a flow direction of the fluid.

More specifically, referring to fig. 3, the throttle valve core 1 is a disk structure, the inner side surface of the throttle valve core 1 is set to be the side surface facing the throttle ring 2, the outer side surface is the side surface facing the inlet end 601, the inner side surface of the throttle valve core 1 is set to be a frustum structure, the frustum structure and the throttle valve core 1 are coaxial, and the cross section of the frustum is gradually reduced from the middle of the throttle valve core 1 to the inner side surface.

Referring to fig. 6, (the construction of the throttle ring 2 of this embodiment is the same as that of the throttle ring 2 of embodiment 2), the outer ring of the throttle ring 2 is fixedly connected to the center portion 602, and the width of the radial cross section of the throttle ring 2 is gradually reduced from the outer ring of the throttle ring 2 toward the inner ring. The side surface of the throttle ring 2 can be a plane surface or a curved surface, so that the molded line structure of the throttle ring 2 is formed. When the side faces are plane, the plane faces are inclined with respect to the centre plane of the throttle ring 2.

The outer diameter of the throttle valve core 1 is set to be D, the diameter of the outer ring of the throttle ring 2 is set to be D, D is larger than D, and the outer end face of the step structure is smaller than the diameter of the outer ring of the throttle ring 2, so that the side wall face of the frustum of the throttle valve core 1 can be matched with the side face of the throttle ring 2, namely matched with the molded line of the throttle ring 2, and then throttling and pressure stabilizing are carried out.

One side of the throttle ring 2 is provided with a throttle valve core 1, the other side is provided with a support frame 7, the support frame 7 is in a cross structure, the outer end part of the support frame 7 is fixedly connected with the inner side wall of the central part 602, the central part of the support frame 7 is fixedly connected with one end of a guide bolt 3 through a fastening nut 5, the guide bolt 3 penetrates through the throttle ring 2, and the other end of the guide bolt is fixedly connected with the central part of the throttle valve core 1.

The coaxial limiting spring 4 is sleeved on the guide bolt 3, the free length of the limiting spring 4 is larger than that of the guide bolt 3, the outer end of the guide bolt 3 is connected with the support frame 7, the limiting spring 4 is limited between the support frame 7 and the throttle valve core 1 and is always in a compressed state, and then the throttle valve core 1 is always supported by the limiting spring 4 and is far away from the throttle ring 2.

The working process of the embodiment:

when fluid enters the valve body 6 from the inlet end 601, the throttle valve core 1 is pushed to move towards the throttle ring 2, the side of the throttle valve core moves along the axial direction, the molded lines of the throttle valve core 1 and the throttle ring 2 are matched, the pressure drop amplitude under different working conditions is adjusted by changing the flow area, and the throttle valve core 1 returns to the original position under the action of the outward pushing force of the limiting spring 4 in the non-working state (after the fluid is static or discharged).

Example 2

Referring to fig. 4 to 8, with respect to embodiment 1, which is a structure of a throttle regulator valve capable of being an inlet at both ends, specifically, referring to fig. 5, a valve body 6 is divided into two parts at a central surface thereof, and the two parts are connected by a bolt structure equally arranged in a circumferential direction around an axis, which allows the length of a central part 602 to be increased and more structures to be placed inside. The throttling valve comprises a throttling valve core 1, two throttling rings 2, two guide bolts 3, two limiting springs 4, two fastening nuts 5 and two supporting frames 7.

Specifically, in the state that the valve body does not work, the throttle valve core 1 is positioned at the central part of the valve body 6, two sides of the throttle valve core 1 are respectively provided with a throttle ring 2, and the outer side of each throttle ring 2 is provided with a support frame 7.

The structure of the throttle valve core 1 in this embodiment is different from that in embodiment 1, and both side surfaces of the throttle valve core 1 are frustum structures, but the size of the frustum structures may be the same or different, and the frustum structure of each side surface is matched with the profile of the throttle ring 2 corresponding to the side surface. The two corresponding throttle rings 2 are positioned symmetrically with respect to the central plane of the entire valve body 6, but the inclination of the sides of the throttle rings 2 may be the same or different.

The outer end of each support frame 7 is fixedly connected with the inner side wall of the central part 602, the central part is fixedly connected with one end of a guide bolt 3 through a fastening nut 5, the guide bolt 3 penetrates through the throttle ring 2, and the other end of the guide bolt is fixedly connected with the central part of the throttle valve core 1.

Each guide bolt 3 is sleeved with a coaxial limiting spring 4, the free length of each limiting spring 4 is larger than that of each guide bolt 3, and the outer end of each guide bolt 3 is connected with a support frame 7, so that each limiting spring 4 is limited between the support frame 7 and the throttle valve core 1 and is always in a compressed state. Thus, in the inoperative state, the throttle valve cartridge 1 is "pushed out" by the two limit springs 4 in the central part of the valve body 6.

The shape and structure of the support bracket 7, the shape and structure of the throttle ring 2, and the shape and structure of the throttle body 1 are the same as those of embodiment 1.

The working principle of the embodiment is as follows:

fluid enters the valve body 6 from any one inlet end 601, the throttle valve core 1 and the throttle ring 2 are pushed to move towards the other direction coaxially, in the process, the molded lines of the throttle valve core 1 and the throttle ring 2 positioned at the downstream of the fluid are matched, the pressure drop amplitude under different working conditions is adjusted by changing the flow area, and after the fluid passes through, the throttle valve core 1 returns to the original position under the action of the side limiting spring 4.

The structure forms an annular flow passing area with a variable flow area with a fixed throttling ring through the axial movement of a self-adaptive throttling valve core, and fluid flows through the area to be decompressed; the flow area is changed through the molded line fit between the self-adaptive throttling valve core and the fixed throttling ring, so that the pressure drop amplitude under different working conditions is adjusted; when the force applied to the valve core by the self-adaptive limiting spring is balanced with the force applied to the valve core under the action of fluid, the compression of the self-adaptive limiting spring is stable; the model selection design is carried out on the molded lines and parameters of the self-adaptive throttling valve core, the fixed throttling ring and the self-adaptive limiting spring through the research on the working conditions under different flow rates and pressures.

By adopting the wide-load self-adaptive variable flow area throttling and pressure stabilizing method, the self-adaptive throttling valve core can automatically move along the axial direction under the action of fluid; the inner wall of the valve body is provided with a fixed throttling ring, and the throttling ring and the valve body can be limited and fixed in a welding or other mode or are integrally manufactured and molded with the valve body; a supporting and guiding structure is arranged in the valve body and used for limiting and guiding the movement of the valve core; the supporting guide structure is connected with the throttling valve core through a valve core guide bolt and a valve core limiting and fastening nut; the valve core guide bolt is provided with a valve core self-adaptive limiting spring which applies force to the support guide structure and the self-adaptive throttling valve core and is used for balancing the acting force of fluid on the valve core; the self-adaptive throttling pressure stabilization of the fluid is realized by the molded line matching of the self-adaptive throttling valve core and the fixed throttling ring and the combination of the displacement amplitude of the valve core under different fluid pressures.

The self-adaptive variable flow area throttling pressure stabilizing valve adopting the method has strong adaptability to the parameters of variable working conditions, has no special requirements on the field environment, does not need to replace or specially design a pipeline, and can realize the functions by additionally installing the device on the field. The self-adaptive variable flow area throttling pressure stabilizing valve adopting the method can perform multi-stage pressure stabilization by increasing the number of valve core stages or increasing the number of devices, thereby further expanding the applicable working condition range.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.