CN210440598U

CN210440598U - Continuous blowdown valve

Info

Publication number: CN210440598U
Application number: CN201920785865.1U
Authority: CN
Inventors: 张乃波
Original assignee: Heilongjiang Muling Power Station Valve Co ltd; Heilongjiang Beifang Valve Co ltd
Current assignee: Heilongjiang Muling Power Station Valve Co ltd; Heilongjiang Beifang Valve Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-05-01
Anticipated expiration: 2029-05-29

Abstract

The utility model relates to a turn-off type valve technical field specifically provides a continuous blowoff valve, include: the valve body is internally provided with a cavity, and the side wall of the valve body is provided with a medium inlet communicated with the cavity; the valve rod is arranged at one end of the cavity in a sealing mode so that a medium outlet is formed at the other end of the cavity, and the valve rod can axially slide in a reciprocating mode along the cavity; and the valve seat is detachably arranged in the cavity, and in the sliding process of the valve rod, one end, close to the medium outlet, of the valve rod is matched with the valve seat to adjust the flow of the medium outlet. The utility model discloses a blowoff valve sets up the detachable disk seat, receives cavitation and erosion influence when damaging at the disk seat, is convenient for change the disk seat, need not to cut whole blowoff valve, and easy access is with the change, and the disk seat adopts to dismantle with the valve body and is connected simultaneously, and no welding material requires, and the disk seat can adopt the higher carbide material of intensity, and relative tradition blowoff valve life is longer, and is not fragile.

Description

Continuous blowdown valve

Technical Field

The utility model relates to a shutoff type valve technical field, concretely relates to continuous blowoff valve.

Background

The continuous blowdown valve is commonly used for continuous blowdown of a boiler drum of a thermal power plant, and the quality of feed water of the boiler is ensured. The boiler steam drum is internally provided with a supersaturated steam and water mixture, the temperature reaches 300-500 ℃, and the pressure exceeds 20Mpa, so that the working condition of the blow-off valve is the worst of all regulating, throttling and pressure reducing valves.

Therefore reasonable design valve structure is crucial to the blowoff valve, and the blowoff valve among the prior art includes the multiple, for example porous throttle governing valve, right angle multistage choke valve etc. but porous throttle governing valve takes place the jam easily when impurity is more, reduces performance, and right angle multistage plunger type blowoff valve is because throttle cooperation position is more, overhauls the difficulty.

Meanwhile, in order to ensure the sealing performance of the blowoff valve in the prior art under severe environment, the valve seat and the valve body and the blowoff pipeline are always connected by welding, and in order to ensure welding, the valve seat and the valve body can only be made of welding steel, so that the steel is easy to damage under the influence of cavitation and erosion for a long time, once the steel is damaged, the whole valve body is required to be replaced by cutting, and the existing blowoff valve is very difficult to overhaul and replace.

SUMMERY OF THE UTILITY MODEL

For solving current blowoff valve because disk seat and valve body welding lead to overhauing and change the technical problem of difficulty, the utility model provides a continuous blowoff valve.

The utility model provides a continuous blowoff valve, include:

the valve body is internally provided with a cavity, and the side wall of the valve body is provided with a medium inlet communicated with the cavity;

the valve rod is arranged at one end of the cavity so that a medium outlet is formed at the other end of the cavity, and the valve rod can axially slide in a reciprocating manner along the cavity; and

the valve seat is detachably arranged in the cavity, and in the sliding process of the valve rod, one end, close to the medium outlet, of the valve rod is matched with the valve seat to adjust the flow of the medium outlet.

In some embodiments, the valve seat is arranged in the cavity in a sleeved mode and is in sealing butt joint with the inner wall of the cavity, a limiting boss is formed in the cavity, the valve seat is provided with a wedge-shaped lug, and the limiting boss is in sealing butt joint with a wedge-shaped surface of the wedge-shaped lug so as to limit the valve seat to move axially along the cavity.

In some embodiments, the waste valve further comprises:

the graphite gasket is arranged between the wedge-shaped lug and the limiting boss, and is provided with a wedge-shaped matching surface which is in sealing butt joint with the wedge-shaped surface of the wedge-shaped lug.

In some embodiments, a tapered structure is arranged at one end of the valve rod, which is matched with the valve seat, and the tapered structure and the inner cavity of the valve seat form an expansion cavity.

In some embodiments, the cross-sectional area of the valve seat lumen increases in a direction from one end away from the media outlet to the other end.

In some embodiments, the waste valve further comprises:

and the protective sleeve is fixedly sleeved at one end of the cavity close to the medium outlet, and one end of the protective sleeve far away from the medium outlet forms the limiting boss.

In some embodiments, the waste valve further comprises:

the flow guide sleeve is sleeved between the valve rod and the inner wall of the cavity and provided with a plurality of throttling windows, and the medium inlet, the throttling windows and the medium outlet are communicated in sequence.

In some embodiments, a plurality of the throttling windows are uniformly arranged along the circumferential direction of the flow guide sleeve, and the throttling windows have equal percentage flow characteristics.

In some embodiments, the waste valve further comprises:

the sealing structure is used for sealing one end, far away from the medium outlet, of the cavity, and comprises a packing seat, a sealing packing and a packing gland which are sequentially arranged between the valve rod and the inner wall of the cavity in the direction from one end, close to the medium outlet, to the other end, and the sealing structure further comprises a packing press plate and a fixing bolt which are arranged at one end, far away from the medium outlet, of the valve body and are used for axially positioning the packing gland.

In some embodiments, a hard alloy is deposited on the valve seat at the position where the valve seat is in sealing engagement with the valve stem; or

The valve seat is made of hard alloy.

The technical scheme of the utility model, following beneficial effect has:

1) the utility model discloses a blowoff valve, including valve body, valve rod and disk seat, be equipped with the die cavity in the valve body, the medium entry of intercommunication die cavity is seted up to its lateral wall, and the one end of die cavity is located to the valve rod, and the other end of die cavity forms the medium export, and the disk seat can be dismantled and locate the die cavity, the one end and the disk seat cooperation of valve rod to adjust the medium flow. The utility model discloses a blowoff valve sets up the detachable disk seat, receives cavitation and erosion influence when damaging at the disk seat, is convenient for change the disk seat, need not to cut whole blowoff valve, and easy access is with the change, and the disk seat adopts to dismantle with the valve body and is connected simultaneously, and no welding material requires, and the disk seat can adopt the higher carbide material of intensity, and relative tradition blowoff valve life is longer, and is not fragile.

2) The utility model discloses a blowoff valve, disk seat cover establish with the die cavity in and with the sealed butt of die cavity inner wall, the shaping has spacing boss in the die cavity, the disk seat has the wedge lug, spacing boss and the sealed butt of wedge face of wedge lug are in order to restrict the disk seat along die cavity axial activity. Set up spacing boss and carry out axial positioning to the disk seat, the disk seat lug sets up to the wedge lug simultaneously, and when spacing boss and wedge lug butt, sealing contact area between the two is littleer, and sealed effect receives the plane degree influence of sealed face littleer, and simultaneously under the disk seat receives the same pressure, area of contact between the two is littleer, and butt pressure between the two is big more, and sealed effect is better.

3) The utility model discloses a blowoff valve still includes the graphite packing ring, locates between wedge lug and the spacing boss, through setting up the graphite packing ring of relative flexibility, improves the sealed effect of disk seat and die cavity inner wall under high temperature high pressure operating mode, can prevent simultaneously that wedge lug and spacing boss butt from warping to after graphite packing ring wearing and tearing or damage, can further realize sealing with spacing boss butt through the wedge lug, improve stability in use.

4) The utility model discloses a blowoff valve, valve rod are equipped with the tapered structure with disk seat complex one end, and the tapered structure forms with the inner chamber of disk seat and expands the chamber, flows through the dilatation chamber when the medium, because the cross-sectional area increase, makes the pressure variation that the medium flows more mitigately, reduces the noise that the export medium produced, reduces the erosion to disk seat and valve body, improves life.

5) The utility model discloses a blowoff valve, the cross-sectional area of disk seat inner chamber is crescent along the direction of keeping away from the one end of medium export to the other end, and the disk seat inner chamber is stepless dilatation structure, further improves above-mentioned effect.

6) The utility model discloses a blowoff valve still includes protective case, and the one end that the die cavity is close to the medium export is located to the cover, protects easy erosion region, improves blowoff valve stability in use, and protective case adopts can dismantle the suit simultaneously, convenient to overhaul and change.

7) The utility model discloses a blowoff valve still includes the water conservancy diversion cover, the cover establish with between valve rod and the die cavity inner wall, a plurality of throttle windows have been seted up to the water conservancy diversion cover, the throttle window is percentage flow characteristic throttle window such as, along with percentage form increases such as aperture increase window area journey, if impurity can get rid of through the window. When the valve is closed, the plunger at the head of the valve rod and the throttling sleeve throttle firstly, so that impurities can be blocked, and the sealing surface is prevented from being damaged by the impurities.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a waste valve according to some embodiments of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Description of reference numerals:

10-a valve body; 11-a media inlet; 12-a medium outlet; 20-a valve stem; 21-cone type structure; 30-a valve seat; 31-a wedge lug; 40-graphite gaskets; 50-a protective sleeve; 51-a gasket; 60-a flow guide sleeve; 61-a throttle window; 71-a filler seat; 72-a sealing packing; 73-packing gland; 74-packing press plate; 75-fixing the bolt.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some examples of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The utility model provides a blowoff valve can be used to for example boiler drum's continuous blowdown etc. fig. 1, fig. 2 show according to the utility model discloses among some embodiments the blowoff valve.

As shown in fig. 1 and 2, the blowoff valve of the present invention comprises a valve body 10, wherein the valve body 10 is provided with an axial cavity for communicating the valve body 10, the side wall of the valve body is provided with a medium inlet 11 for communicating the cavity, and the medium inlet 11 and the cavity form a three-way valve body 10 structure. The valve core assembly is arranged at one end of the cavity, so that the other end of the cavity forms a medium outlet 12, namely, the medium inlet 11 and the medium outlet 12 form a communicated medium flow passage. Specifically, the valve core assembly comprises a valve rod 20 and a valve seat 30, the valve seat 30 is detachably mounted at a communication position of the medium inlet 11 and the medium outlet 12, and one end of the valve rod 20 is matched with the valve seat 30 in the process of sliding up and down in the cavity, so that the flow of the medium flowing out of the medium outlet 12 through the medium inlet 11 is regulated.

In some embodiments, a protective sleeve 50 is sleeved on one end of the cavity close to the medium outlet, the protective sleeve 50 is made of a high corrosion-resistant and wear-resistant material, and is installed at the medium outlet 12 to protect the easily-eroded area, so that the service stability of the blow-down valve is improved, and meanwhile, the protective sleeve is detachably sleeved to facilitate maintenance and replacement. One end of the protective sleeve 50 is axially limited with the inner wall of the cavity through a limiting boss, and a gasket 51 is arranged between the limiting boss and the shaft shoulder structure of the cavity for improving the sealing effect.

As shown in fig. 2, the valve seat 30 has wedge-shaped lugs 31, and when the valve seat 30 is assembled, the wedge-shaped lugs 31 are engaged with the position-restricting bosses of the protection sleeve 50 to be axially positioned. A graphite gasket 40 is arranged between the limiting boss and the wedge-shaped lug 31, the graphite gasket 40 is provided with a wedge-shaped matching surface, the wedge-shaped matching surface of the graphite gasket is in sealing butt joint with the wedge-shaped surface of the wedge-shaped lug 31, and the lower end surface of the graphite gasket is in sealing butt joint with the upper end surface of the limiting boss. Graphite packing ring 40 has good high temperature resistance and leakproofness, can improve the leakproofness of dismantling between disk seat 30 and die cavity and the protective case 50, simultaneously in graphite packing ring wearing and tearing or damage back, disk seat 30 is under pressure, spacing boss can with wedge lug 31 sealed butt, guarantee sealed effect, and when both butts, sealed area of contact is littleer, sealed effect receives the plane degree influence of sealed face littleer, simultaneously under the disk seat receives the same pressure, area of contact between them is littleer, butt pressure between the two is big more, sealed effect is better.

As shown in fig. 1, one end of the valve rod 20 is provided with a tapered structure 21, and a tapered surface of the tapered structure 21 abuts against the valve seat 30, so that the flow rate of the medium flowing through the abutting position of the two is adjusted by the vertical movement of the valve rod 20. The conical structure 21 extends into the inner cavity of the valve seat 30, and forms an expansion cavity with the inner cavity wall of the valve seat 30, the space of the expansion cavity is gradually enlarged, when a medium flows out through the expansion cavity, the pressure change of the medium flowing out is more moderate due to the increase of the cross section area, the noise generated by the medium at the outlet is reduced, the erosion to the valve seat and the valve body is reduced, and the service life is prolonged. Preferably, as shown in fig. 2, the cross-sectional area of the inner cavity of the valve seat 30 gradually increases from top to bottom, so that the inner cavity of the valve seat 30 is in a stepless capacity expansion structure, and the capacity expansion effect is further improved.

In some embodiments, a flow guiding sleeve 60 is further disposed between the medium inlet 11 and the valve seat 30, the flow guiding sleeve 60 is fixedly mounted between the valve rod 20 and the cavity wall, the valve rod 20 slides up and down in an inner cavity of the flow guiding sleeve 60, as shown in fig. 2, a lower end of the flow guiding sleeve 60 abuts against the valve seat 30 to axially position the valve seat 30, a side wall of the valve rod 20 is matched with a plurality of throttling windows 61 formed in the flow guiding sleeve 60, and the throttling windows 61 communicate with the medium inlet 11, so that the flow of the medium flowing through the throttling windows 61 is controlled by movement of the valve rod 20. In some embodiments, the throttling windows 61 are uniformly arranged along the circumferential wall of the baffle sleeve 60 at the position of the medium inlet 11, for example, four throttling windows are circumferentially and uniformly arranged. Preferably, the throttle window 61 is opened to be an equal percentage flow characteristic window, the window area is increased in an equal percentage mode along with the increase of the opening, if impurities can be discharged through the opened window, the blockage is avoided, and meanwhile, when the blow-down valve is closed, the prior valve rod 20 and the throttle window 61 are matched for throttling, the impurities can be blocked, and the sealing surface is prevented from being damaged by the impurities.

The upper end of the guide sleeve 60 is provided with a sealing structure, so that one end of the cavity far away from the medium outlet 12 is sealed, and the medium is prevented from leaking from the end of the valve rod 20. As shown in fig. 1, the sealing structure includes a packing seat 71, a sealing packing 72 and a packing gland 73, which are sequentially and hermetically abutted between the valve rod 20 and the cavity wall above the guide sleeve 60. With continued reference to FIG. 1, the seal structure further includes a packing plate 74 that axially positions the packing gland 73 and a set bolt 75 that fixedly connects the packing plate 74 to the valve body 10. In an exemplary implementation, the packing seal 72 may be a multi-layer graphite ring structure, and seals between the valve rod 20 and the cavity wall through the packing seal structure, and simultaneously axially compresses the components in the cavity to prevent the medium from leaking.

In some embodiments, as shown in fig. 1, a hard alloy, such as a cobalt-based hard alloy (hardness HRC42-45), a tungsten carbide-based hard alloy (hardness HRC69-80), or the like, is deposited on the valve seat 30 at a location where it sealingly engages the valve stem 20, thereby increasing the strength of the valve seat 30 and thus increasing the service life. In other embodiments, because the valve seat 30 of the blowoff valve of the present invention adopts the detachable connection, it is not necessary to limit the valve seat 30 to be a welding material, and therefore the valve seat 30 can be made of hard alloy, such as the above hard alloy, to further improve the strength of the valve seat.

It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A continuous blowdown valve, comprising:

the valve body (10) is internally provided with a cavity, and the side wall of the valve body is provided with a medium inlet (11) communicated with the cavity;

the valve rod (20) is arranged at one end of the cavity in a sealing mode, so that the other end of the cavity forms a medium outlet (12), and the valve rod (20) can axially slide back and forth along the cavity; and

the valve seat (30) is detachably arranged in the cavity, and in the sliding process of the valve rod (20), one end, close to the medium outlet (12), of the valve rod (20) is matched with the valve seat (30) to adjust the flow of the medium outlet (12).

2. The waste valve as claimed in claim 1,

the utility model discloses a valve seat, including the die cavity, disk seat (30) cover is located in the die cavity and with the sealed butt of die cavity inner wall, the shaping has spacing boss in the die cavity, disk seat (30) have wedge lug (31), spacing boss with the sealed butt of wedge face of wedge lug (31) is in order to restrict disk seat (30) are followed die cavity axial activity.

3. The waste valve as claimed in claim 2, further comprising:

the graphite gasket (40) is arranged between the wedge-shaped lug (31) and the limiting boss, and the graphite gasket (40) is provided with a wedge-shaped matching surface which is in sealing abutment with a wedge-shaped surface of the wedge-shaped lug (31).

4. A waste valve according to any of claims 1 to 3,

one end of the valve rod (20) matched with the valve seat (30) is provided with a conical structure (21), and the conical structure (21) and an inner cavity of the valve seat (30) form an expansion cavity.

5. The waste valve as claimed in claim 4,

the cross-sectional area of the inner cavity of the valve seat (30) is gradually increased along the direction from one end far away from the medium outlet (12) to the other end.

6. A waste valve as claimed in claim 2 or 3, further comprising:

the protective sleeve (50) is sleeved at one end, close to the medium outlet (12), of the cavity, and the limiting boss is formed at one end, far away from the medium outlet (12), of the protective sleeve (50).

7. A waste valve as claimed in any one of claims 1 to 3, further comprising:

the flow guide sleeve (60) is sleeved between the valve rod (20) and the inner wall of the cavity, the flow guide sleeve (60) is provided with a plurality of throttling windows (61), and the medium inlet (11), the throttling windows (61) and the medium outlet (12) are communicated in sequence.

8. The waste valve as claimed in claim 7,

the throttling windows (61) are uniformly arranged along the circumferential direction of the flow guide sleeve (60), and the throttling windows (61) are equal-percentage flow characteristic throttling windows.

9. The waste valve as claimed in claim 7, further comprising:

the sealing structure is used for sealing one end, far away from the medium outlet (12), of the cavity, and comprises a packing seat (71), a sealing packing (72) and a packing gland (73) which are sequentially arranged between the valve rod (20) and the inner wall of the cavity in the direction from one end, close to the medium outlet (12), to the other end, and the sealing structure further comprises a packing pressure plate (74) and a fixing bolt (75) which are arranged at one end, far away from the medium outlet (12), of the valve body (10) and used for axially positioning the packing gland (73).

10. A waste valve according to any of claims 1 to 3,

hard alloy is welded on the position where the valve seat (30) is in sealing fit with the valve rod (20); or

The valve seat (30) is made of cemented carbide.