CN114251513A

CN114251513A - Pressure reducing valve

Info

Publication number: CN114251513A
Application number: CN202111602669.4A
Authority: CN
Inventors: 刘栋; 宋亚洲; 鲍南宇; 王颖泽; 刘顺
Original assignee: Suzhou Valve Doctor Fluid Control Technology Co ltd; Jiangsu University
Current assignee: Suzhou Valve Doctor Fluid Control Technology Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-03-29
Anticipated expiration: 2041-12-24
Also published as: CN114251513B

Abstract

The invention provides a pressure reducing valve which comprises a valve rod, a valve core, a valve body, a valve rod extension section, a first guide vane, a guide body and a second guide vane, wherein the valve rod extension section is provided with a first guide vane and a second guide vane; the valve rod is arranged in the valve body, and the lower part of the valve rod is provided with a valve core; the upper part of the valve rod extension section is connected with the valve core, and the lower part of the valve rod extension section is inserted into the flow guide body below the valve core; the first guide vanes are uniformly arranged on the circumference of the upper part of the guide body, gaps are reserved between the adjacent first guide vanes, the first guide vanes can move up and down along the extension section of the valve rod to rotate, a plurality of second guide vanes are arranged on the circumference of the guide body and connected with the inner wall of the valve body, guide channels are formed between the adjacent second guide vanes, and the second guide vanes are positioned below the first guide vanes. The pressure reducing valve has the functions of rectifying and reducing noise, and rectifies and reduces pressure of high-temperature steam in the valve body, so that the effect of reducing flow-induced noise is achieved.

Description

Pressure reducing valve

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a pressure reducing valve.

Background

The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. In the production and operation process of a power plant, the high-temperature pressure reduction valve controls the circulation and the stop of high-temperature steam. The high temperature steam has a large flow velocity in the valve body, and generates large flow-induced noise. When the steam flow entering the valve is greatly changed, the flow of the steam becomes unstable, and noise is easily induced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a pressure reducing valve which has a rectifying and noise reducing function and is used for rectifying and reducing high-temperature steam in a valve body to achieve the effect of reducing flow-induced noise.

The technical scheme of the invention is as follows: a pressure reducing valve comprises a valve rod, a valve core, a valve body, a valve rod extension section, a first guide vane, a guide body and a second guide vane;

the valve rod is arranged in the valve body, and the lower part of the valve rod is provided with a valve core; the upper part of the valve rod extension section is connected with the valve core, and the lower part of the valve rod extension section is inserted into the flow guide body below the valve core; the first guide vanes are uniformly arranged on the circumference of the upper part of the guide body, gaps are reserved between the adjacent first guide vanes, the first guide vanes can move up and down along the extension section of the valve rod to rotate, a plurality of second guide vanes are arranged on the circumference of the guide body and connected with the inner wall of the valve body, guide channels are formed between the adjacent second guide vanes, and the second guide vanes are positioned below the first guide vanes.

In the above scheme, the petiole of first guide vane inserts in the hole on baffle upper portion, and the end of petiole is equipped with the spur gear, and the rack toothing at straight gear and valve rod extension section middle part, first guide vane can reciprocate along valve rod extension section and be rotary motion, and the control baffle water conservancy diversion says and slowly opens and close.

In the scheme, the lower part of the valve rod extension section is inserted into a valve rod hole of the flow guide body; and a valve rod clamping sleeve is arranged between the valve rod hole and the valve rod extension section.

In the above scheme, the second guide vane is a concave space guide vane, the upper part of the second guide vane is a cylindrical section, and the lower part of the second guide vane is a twisted section.

In the above scheme, the sectional area of the flow guide body is gradually increased downwards.

In the scheme, the device also comprises an inlet throttle plate; the inlet throttle plate is mounted at the inlet of the valve.

In the scheme, the device also comprises an outlet throttle plate; the outlet throttle plate is mounted at the outlet of the valve.

Further, the upper part of the outlet throttle plate is connected with the valve body through a throttle plate connecting ring; the bottom of the outlet throttle plate is arranged on the throttle plate base.

In the above scheme, the middle of the throttle plate base is in a smooth and raised shape.

In the above scheme, the upper part of the valve rod extension section is connected with the valve core through threads.

Compared with the prior art, the invention has the beneficial effects that: the first guide vane can move up and down along with the extension section of the valve rod to rotate, and the opening and closing of the guide flow guide channel of the guide flow body are controlled according to the opening degree of the valve, so that the guide flow guide device not only can guide high-temperature steam, but also has the function of reducing pressure; the lower part of the second guide vane is a twisted surface, so that the direction of high-temperature steam flowing out of the guide body can be changed, and the high-temperature steam is prevented from scouring the valve body. The invention solves the problem of overlarge noise of the existing steam valve in the working process, improves the working environment of personnel working beside the steam conveying pipeline equipment, reduces the harm of noise to human bodies, reduces the pollution of noise to the environment, improves the safety of the valve and prolongs the service life of the valve.

Drawings

FIG. 1 is a schematic front view of an embodiment of the present invention;

fig. 2 is a schematic view of a flow conductor structure for showing a spatial structure of the flow conductor and a second guide vane according to an embodiment of the present invention;

FIG. 3 is a top view of a first guide vane of an embodiment of the present invention illustrating the spatial position of the first guide vane stem and stem extension;

FIG. 4 is a schematic structural view of a single blade of the first guide vane for illustrating the axial rotation of the first guide vane along the blade shank according to an embodiment of the present invention;

FIG. 5 is an enlarged view of I in FIG. 1 for illustrating the manner and details of the engagement of the rack gear at the middle of the valve stem extension with the spur gear on the opening degree adjustment vane;

FIG. 6 is an enlarged view of II of FIG. 1 illustrating the threaded engagement of the valve cartridge and the valve stem extension according to one embodiment of the present invention.

In fig. 1: 1. a valve stem; 2. a valve core; 3. an inlet throttle plate; 4. a valve inlet; 5. a valve seat; 6. a flow conductor; 7. a spur gear; 8. a cylindrical section; 9. a second guide vane; 10. a valve rod clamping sleeve; 11. a valve stem bore; 12. a valve outlet; 13. a valve cover; 14. a valve body; 15. a valve stem extension section; 16. a rack; 17. an oblique hole; 18. a first guide vane; 19. a twisted section; 20. a throttle plate connecting ring; 21. an outlet throttle plate; 22. a throttle plate base; 23. and (4) leaf stalks.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; 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 by those skilled in the art according to specific situations.

Fig. 1 shows a preferred embodiment of the pressure reducing valve, which includes a valve stem 1, a valve core 2, a valve body 14, a valve stem extension 15, a first guide vane 18, a guide body 6 and a second guide vane 9;

the valve rod 1 is longitudinally arranged and installed in the valve body 14, and the lower part of the valve rod 1 is provided with the valve core 2 for controlling the opening and closing of the valve; the upper part of the valve rod extension section 15 is connected with the valve core 2, and the lower part is inserted into the lower flow guide body 6; the first guide vanes 18 are uniformly arranged on the circumference of the upper part of the guide body 6, gaps are reserved between the adjacent first guide vanes 18, the first guide vanes 18 can move up and down along the valve rod extension section 15 to do rotary motion, a plurality of second guide vanes 9 are arranged on the circumference of the guide body 6, the second guide vanes 9 are connected with the inner wall of the valve body 14, guide channels are formed between the adjacent second guide vanes 9, and the second guide vanes 9 are positioned below the first guide vanes 18.

As shown in fig. 3, 4 and 5, according to the present embodiment, preferably, the petiole 23 of the first guide vane 18 is inserted into the hole 17 at the upper portion of the guide body 6, the end of the petiole 23 is provided with a spur gear 7, the spur gear 7 is engaged with the rack 16 at the middle portion of the valve stem extension 15, and the first guide vane 18 can move up and down along the valve stem extension 15 to rotate, so as to control the flow passage of the guide body 6 to be opened and closed slowly.

According to the embodiment, preferably, the lower part of the valve rod extension 15 is inserted into the valve rod hole 11 of the flow guiding body 6, and a valve rod clamping sleeve 10 is arranged between the valve rod hole 11 and the valve rod extension 15, so that the valve rod extension 15 is prevented from deviating from the axis direction due to flushing of high-temperature steam.

As shown in fig. 2, according to the present embodiment, preferably, the second guide vane 9 is a concave space guide vane, and the upper portion of the second guide vane 9 is a cylindrical section 8 and the lower portion is a twisted section 19.

According to the present embodiment, it is preferable that the steam generator further comprises an inlet throttle plate 3, wherein the inlet throttle plate 3, i.e. the first stage throttle plate, is installed at the inlet of the valve to primarily decompress the high temperature steam flowing into the valve.

According to the present embodiment, it is preferable to further include an outlet throttle plate 21; the outlet throttle plate 21 is mounted at the outlet of the valve.

According to the present embodiment, preferably, the upper portion of the outlet throttle plate 21 is connected to the valve body 14 through a throttle plate connecting ring 20; the bottom of the outlet throttle plate 21 is mounted on a throttle plate base 22.

The middle of the throttle plate base 22 is in a smooth and raised shape, and the structure can prevent high-temperature steam from forming vortex in the middle of the base, reduce noise generated by the high-temperature steam and erosion on the throttle plate base 22, and prolong the service life of the throttle plate base 22.

As shown in fig. 6, according to the present embodiment, preferably, the upper portion of the stem extension 15 is provided with an external thread, the valve core 2 is provided with an internal thread, the stem extension 15 is connected with the valve core 2 through a thread, and the thread structure is convenient for disassembly and maintenance.

According to the present embodiment, preferably, the flow guiding body 6 is provided with seven second flow guiding vanes 9, and the second flow guiding vanes 9 are of a concave structure and are connected and fixed with the valve body 14, so that 7 flow guiding channels are formed on the circumference of the flow guiding body 6; because the high-temperature steam flowing into the valve body 14 makes disordered movement in the flow passage of the valve body 14, the second guide vane 9 can play a role in guiding the high-temperature steam, and the noise of the high-temperature steam can be greatly reduced; when the guide vanes 9 are in a concave type change rule, the speed change of the high-temperature steam is gentle, and the speed distribution is most uniform. Meanwhile, the sectional area of the flow guide body 6 is gradually increased downwards, so that the pressure reduction effect can be achieved.

The number of the first guide vanes 18 is seven, the first guide vanes 18 are opening degree adjusting vanes, the first guide vanes 18 correspond to seven flow channels of the guide body 6, when the valve is slowly opened, the first guide vanes 18 can rotate along with the up-and-down movement of the valve rod extension section 15 to control the flow channels of the guide body 6 to be slowly opened, and when the valve is completely opened, the moving direction of the first guide vanes 18 is consistent with the incoming flow direction of high-temperature steam, so that the guide effect can be achieved; when the valve is closed slowly, the same principle is carried out. Preferably, the size and shape of the gap between adjacent first guide vanes 18 are the same as the thickness and cross-sectional shape of the second guide vane cylindrical section 8, and when the valve is completely closed, the guide duct can be sealed, so that the guide duct is completely closed, and if the valve leaks inwards, the guide duct can serve as a second protective measure to play a role in sealing. The design can enable the high-temperature steam to flow in a smaller flow passage when the flow rate of the high-temperature steam is smaller, improve the flow state of the high-temperature steam in the second guide vane 9, and achieve better rectification effect, so that the flow-induced noise is greatly reduced.

The twisted section 19 of the second guide vane 9 can change the direction of the high-temperature steam flowing out of the guide body, so that the high-temperature steam axially flows out along the upper aperture of the outlet throttle plate 21, thereby avoiding the high-temperature steam from washing the valve body 14 and the throttle plate base 22, and improving the safety and the service life of the pressure reducing valve.

An outlet throttle plate 21, i.e. a second stage throttle plate, arranged at the outlet of the valve is located in the valve flow passage to further depressurize the high temperature steam.

According to the invention, the straight gear 7 on the petiole 23 of the first guide vane 18 is meshed with the rack 16 in the middle of the valve rod extension section 15, can rotate along with the valve rod extension section 15, and controls the opening and closing of a guide body flow passage according to the opening degree of a valve, so that high-temperature steam can be guided, and a pressure reduction effect is achieved; the lower part of the second guide vane 9 is a twisted surface, so that the direction of high-temperature steam flowing out of the guide body can be changed, and the high-temperature steam is prevented from scouring the valve body. The invention solves the problem of overlarge noise of the existing steam valve in the working process, improves the working environment of personnel working beside the steam conveying pipeline equipment, reduces the harm of noise to human bodies, reduces the pollution of noise to the environment, improves the safety of the valve and prolongs the service life of the valve.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The pressure reducing valve is characterized by comprising a valve rod (1), a valve core (2), a valve body (14), a valve rod extension section (15), a first guide vane (18), a guide body (6) and a second guide vane (9);

the valve rod (1) is arranged in the valve body (14), and the lower part of the valve rod (1) is provided with the valve core (2); the upper part of the valve rod extension section (15) is connected with the valve core (2), and the lower part of the valve rod extension section is inserted into the lower flow guide body (6); first guide vane (18) are evenly installed at the upper portion circumference of baffle (6), have the clearance between adjacent first guide vane (18), first guide vane (18) can reciprocate along valve rod extension (15) and do rotary motion, a plurality of second guide vane (9) are arranged to the circumference of baffle (6), second guide vane (9) and valve body (14) inner wall connection, form the flow leader between adjacent second guide vane (9), second guide vane (9) are located the below of first guide vane (18).

2. The pressure reducing valve according to claim 1, wherein a stem (23) of the first guide vane (18) is inserted into a hole (17) in the upper portion of the guide body (6), a spur gear (7) is arranged at the tail end of the stem (23), the spur gear (7) is meshed with a rack (16) in the middle of the valve rod extension section (15), and the first guide vane (18) can move up and down along the valve rod extension section (15) to rotate.

3. The pressure reducing valve according to claim 1, wherein the stem extension (15) is inserted at its lower part in the stem bore (11) of the flow conductor (6); and a valve rod clamping sleeve (10) is arranged between the valve rod hole (11) and the valve rod extension section (15).

4. The pressure reducing valve according to claim 1, wherein the second guide vane (9) is a concave space guide vane, and the upper part of the second guide vane (9) is a cylindrical section (8) and the lower part is a twisted section (19).

5. Pressure reducing valve according to claim 1, characterized in that the cross-sectional area of the flow conductor (6) increases downwards.

6. The pressure reducing valve according to claim 1, further comprising an inlet throttle plate (3); the inlet throttle plate (3) is arranged at the inlet of the valve.

7. The pressure reducing valve according to claim 1, further comprising an outlet throttle plate (21); the outlet throttle plate (21) is mounted at the outlet of the valve.

8. The pressure reducing valve according to claim 7, wherein the upper part of the outlet throttle plate (21) is connected to the valve body (14) by a throttle plate connection ring (20); the bottom of the outlet throttle plate (21) is mounted on a throttle plate base (22).

9. The pressure relief valve according to claim 8, wherein the middle of the throttle plate seat (22) is in the shape of a smooth bulge.

10. The pressure reducing valve according to claim 1, wherein the upper part of the stem extension (15) is screwed to the valve cartridge (2).