CN114251513B

CN114251513B - Pressure reducing valve

Info

Publication number: CN114251513B
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
Current assignee: Suzhou Valve Doctor Fluid Control Technology Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2024-04-09
Anticipated expiration: 2041-12-24
Also published as: CN114251513A

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 arranged on the valve body; the valve rod is arranged in the valve body, and a valve core is arranged at the lower part of the valve rod; 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 lower guide body; 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 perform rotary motion, 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, rectifies and reduces the pressure of high-temperature steam in the valve body, and achieves the effect of reducing flow-induced noise.

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 component in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing backflow, stabilizing pressure, diverting or overflow pressure relief and the like. In the production operation process of the power plant, the high-temperature pressure reducing valve controls the circulation and cut-off of high-temperature steam. The high temperature steam has a greater flow velocity in the valve body, which produces greater flow induced noise. When the steam flow entering the valve is changed greatly, the flow of steam becomes unstable, and noise is easy to induce.

Disclosure of Invention

Aiming at the technical problems, the invention provides the pressure reducing valve which has the functions of rectifying and reducing noise, rectifies and reduces the pressure of high-temperature steam in the valve body, and achieves 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 a valve core is arranged at the lower part of the valve rod; 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 lower guide body; 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 perform rotary motion, 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 the first guide vane is inserted into the hole at the upper part of the guide body, the tail end of the petiole is provided with the spur gear, the spur gear is meshed with the rack at the middle part of the valve rod extension section, the first guide vane can move up and down along the valve rod extension section to perform rotary motion, and the guide body guide channel is controlled to be opened and closed slowly.

In the scheme, the lower part of the valve rod extension section is inserted into the valve rod hole of the current carrier; 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 twisting section.

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

In the scheme, the device further 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 mounted on the throttle plate base.

In the scheme, the middle of the throttle plate base is in a smooth bulge shape.

In the 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: according to the invention, the first guide vane can move up and down along with the valve rod extension section to perform rotary motion, and the opening and closing of the guide body guide channel are controlled according to the opening of the valve, so that high-temperature steam can be guided, and meanwhile, the depressurization effect is achieved; 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 scouring of the high-temperature steam to the valve body is avoided. The invention solves the problem that the existing steam valve has overlarge noise 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 director according to an embodiment of the present invention, showing the spatial configuration of the flow director and the second flow director blade;

FIG. 3 is a top view of a first guide vane showing the spatial location of a first guide vane stem and an extension of a valve stem according to an embodiment of the present invention;

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

FIG. 5 is an enlarged view of I of FIG. 1 showing the manner and details of engagement of the rack in the middle of the extension of the valve stem with the spur gear on the opening adjustment vane in accordance with one embodiment of the present invention;

FIG. 6 is an enlarged view of II of FIG. 1 showing the threaded engagement of the valve core and the valve stem extension in accordance with 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 guide body; 7. spur gears; 8. a cylindrical section; 9. a second guide vane; 10. valve rod cutting sleeve; 11. a valve stem bore; 12. a valve outlet; 13. a valve cover; 14. a valve body; 15. a valve stem extension; 16. a rack; 17. an oblique hole; 18. a first guide vane; 19. a twisting section; 20. a throttle plate connecting ring; 21. an outlet throttle plate; 22. a throttle plate base; 23. a leaf stalk.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

FIG. 1 shows a preferred embodiment of the pressure reducing valve, which comprises a valve rod 1, a valve core 2, a valve body 14, a valve rod 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 a valve core 2 is arranged at the lower part of the valve rod 1 to control 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 guide body 6; the first guide vanes 18 are uniformly arranged on the upper circumference 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 perform 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 located below the first guide vanes 18.

As shown in fig. 3, 4 and 5, according to this embodiment, preferably, the stem 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 stem 23 is provided with a spur gear 7, the spur gear 7 is meshed with the rack 16 at the middle of the valve rod extension 15, and the first guide vane 18 can move up and down along the valve rod extension 15 to perform a rotational movement, so as to control the flow passage of the guide body 6 to be slowly opened and closed.

According to this embodiment, preferably, the lower portion of the valve rod extension 15 is inserted into the valve rod hole 11 of the fluid director 6, and the valve rod clamping sleeve 10 is disposed 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 axial 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 to further include an inlet throttle plate 3, the inlet throttle plate 3, i.e., a 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 by 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 bulge shape, and the structure can prevent high-temperature steam from forming vortex in the middle of the base, can reduce noise generated by the high-temperature steam and corrosion to the throttle plate base 22, and can improve the service life of the throttle plate base 22.

As shown in fig. 6, according to this embodiment, preferably, the upper portion of the valve rod extension 15 is provided with external threads, the valve core 2 is provided with internal threads, the valve rod extension 15 is connected with the valve core 2 through threads, and the threaded structure is convenient to detach and maintain.

According to this embodiment, preferably, the flow guiding body 6 is provided with seven second flow guiding blades 9, and the second flow guiding blades 9 are connected and fixed with the valve body 14 in a concave structure, 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 irregular movement in the flow channel 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 vane 9 is in a concave 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 current carrier 6 gradually increases downwards, so that the pressure reducing effect can be achieved.

The first guide vanes 18 are seven pieces in total, the first guide vanes 18 are opening adjusting vanes, the first guide vanes 18 correspond to seven flow passages 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, the flow passages of the guide body 6 are controlled 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 direction of high-temperature steam, so that the guide effect can be achieved; the same applies when the valve is slowly closed. Preferably, the size and shape of the gap between the adjacent first guide vanes 18 are the same as the thickness and cross-sectional shape of the second guide vane cylindrical section 8, so that when the valve is completely closed, the guide channel can be sealed, and if the valve leaks inwards, the guide channel 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 flowing state of the high-temperature steam in the second guide vane 9, have better rectifying effect and further greatly reduce flow induced noise.

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 flows out axially along the aperture on the outlet throttle plate 21, the flushing of the valve body 14 and the throttle plate base 22 by the high-temperature steam is avoided, and the safety and the service life of the pressure reducing valve are improved.

The outlet throttle plate 21, i.e. the second stage throttle plate, arranged at the outlet of the valve is positioned in the valve flow channel to further decompress the high temperature steam.

According to the invention, the spur gear 7 on the blade stem 23 of the first guide blade 18 is meshed with the rack 16 in the middle of the valve rod extension section 15, and can rotate along with the valve rod extension section 15, and the opening and closing of the flow channel of the guide body are controlled according to the opening of the valve, so that high-temperature steam can be guided, and meanwhile, the pressure reduction effect is realized; 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 scouring of the high-temperature steam to the valve body is avoided. The invention solves the problem that the existing steam valve has overlarge noise 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 list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the 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 a valve core (2) is arranged at the lower part of the valve rod (1); 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 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 with 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 located below the first guide vanes (18).

2. The pressure reducing valve according to claim 1, characterized in that the stem (23) of the first guide vane (18) is inserted into the hole (17) at the upper part of the guide body (6), the end of the stem (23) is provided with a spur gear (7), the spur gear (7) is meshed with the rack (16) at the middle part of the valve rod extension (15), and the first guide vane (18) can perform rotary motion along with the up-and-down movement of the valve rod extension (15).

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

4. Pressure reducing valve according to claim 1, characterized in that the second guide vane (9) is a concave space guide vane, 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 gradually downwards.

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

7. 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. Pressure reducing valve according to claim 7, characterized in that the upper part of the outlet throttle plate (21) is connected to the valve body (14) by means of a throttle plate connecting ring (20); the bottom of the outlet throttle plate (21) is mounted on a throttle plate base (22).

9. The pressure relief valve of claim 8, wherein the middle of the throttle plate base (22) is smooth, crowned shape.

10. Pressure reducing valve according to claim 1, characterized in that the upper part of the valve stem extension (15) is screwed with the valve core (2).