CN211449658U

CN211449658U - Bypass valve

Info

Publication number: CN211449658U
Application number: CN201922467529.5U
Authority: CN
Inventors: 徐传堂
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-08
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a bypass valve, including valve body, disk seat, valve rod, case, cage, disk seat, case, cage install in the valve body, the case is cylindrical structure, the bottom of case is the level, the cage is installed on the disk seat, the cage is in the periphery of case, the cage with it is gapped between the case, the baffle is installed to the case lower part, the baffle with the side bottom of case links to each other, but the baffle free activity is in the recess of disk seat, and there is the through-hole bottom of recess. The utility model discloses can effectively the sealed face of valve body, effectively reduce the valve and reveal and the phenomenon that the valve broke down.

Description

Bypass valve

Technical Field

The utility model relates to a fluid throttle field especially relates to a bypass valve.

Background

The bypass valve is a high-temperature and high-pressure regulating valve commonly used in power plants, is a very important device in a steam turbine system, and plays a very important role in improving the starting performance of a unit and protecting the normal operation of the unit. The high-temperature and high-pressure steam mainly passes through the inside of the bypass valve, and in the starting process of the unit, certain moisture or foreign matters are often contained in the high-temperature and high-pressure steam, so that the high-temperature and high-pressure steam has certain destructiveness under the action of high-speed steam flow in a pipeline, and the damage to a valve core and a valve seat part of the valve is obvious.

In practical use, the sealing part of the valve is often impacted by foreign matters or water in steam, so that a valve line is damaged, and the valve leaks inwards; or after micro leakage occurs, the sealing surface can be further damaged due to the action of flash evaporation or cavitation, so that a large leakage phenomenon occurs, working medium is wasted, and the efficiency of the unit is reduced. Meanwhile, for the system, the open-close failure of the bypass valve has huge potential safety hazard to the turboset.

SUMMERY OF THE UTILITY MODEL

To solve the above-mentioned problems in the background art, a bypass valve includes: the valve comprises a valve cover, a valve body, a valve seat, a valve rod, a valve core, an inlet and an outlet, wherein the valve cover is arranged on the upper portion of the valve body, a connecting channel is arranged between the inlet and the outlet and inside the valve body, the valve seat is arranged on the lower portion of the valve body, the lower portion of the valve seat is the outlet of the bypass valve, the valve core is movably arranged above the valve seat, the valve core is of a cylindrical structure, the valve core and the valve rod are integrally arranged, and the valve core moves up and down to be in contact with or separated from the valve seat, so that the connecting channel is.

The outer edge of the bottom of the valve core is connected with a baffle plate, the baffle plate surrounds the bottom of the valve core, the upper surface of the valve seat is provided with an annular groove, the baffle plate freely moves up and down in the annular groove, the bottom of the annular groove is provided with a through hole, the through hole is communicated with the space at the upper part of the annular groove and a connecting channel at the lower part of the valve seat,

the utility model discloses a baffle forms the protection to sealed face, and water or foreign matter in the steam can not directly erode case, disk seat, and the valve is just difficult to damage.

The bypass valve further comprises a cage, the lower portion of the cage is located on the valve seat and is installed in a circular ring-shaped channel of the valve seat in a matched mode, the cage surrounds the valve element, the upper portion of the cage is connected with the bottom of the valve cover, the cage is in clearance fit with the valve element, a passage through which working media flow is arranged on the cage, and the circular ring-shaped channel is located on the outer side of the circular ring-shaped groove.

The lower part of the common valve core is provided with a cage, and the sealing surface of the valve core is arranged at the upper part of the cage, so that foreign matters in a pipeline or water contained in steam directly scour the sealing surface of the valve core under the action of high-temperature and high-pressure steam to cause damage of the valve core;

the utility model discloses a cage cover can further reduce the direct impact force to the case from the steam or rivers that go into from the import to can keep off some big granule things in the outside, still can the noise reduction, visual flow's the condition is considered to adopt single cage cover still nested two cage cover forms.

Further, the valve core is cylindrical, and the bottom of the valve core is a horizontal plane. The sealing part of the lower end part of the common valve core is in a slope form, and the corresponding valve seat is matched with the slope form, so that the sealing line is uniformly ground, but the sealing line is easily damaged by the impact of water or foreign matters in steam, or flash evaporation or cavitation is generated after local micro-damage is generated.

Furthermore, the bottom of the valve cover is a circular plane, and the bottom of the plane is connected with the top of the cage. The cage extends from the bottom of the valve cover to the upper surface of the valve seat, and the stationary parts of the valve are firmly fastened into a whole through the action of the valve cover screw.

Furthermore, the bottom of the baffle is lower than the bottom surface of the valve core and is shielded outside the sealing surface of the valve core and the valve seat, the upper surface of the valve seat is provided with an annular groove, when the valve core presses the valve seat, the baffle falls into the annular groove, the bottom of the groove is provided with four symmetrical through holes, so that foreign matters or water in steam can conveniently fly out of the through holes, the probability that the water or the foreign matters in the steam scour a valve line is reduced, and the phenomenon that the valve core presses the foreign matters in the closing process of the valve is avoided.

Further, the baffle is integrally formed with the valve core.

Further, the cage is of a sleeve type, a plurality of holes are formed in the sleeve, and the diameter of each through hole is larger than that of each hole. The holes can play a role in reducing pressure, eliminating noise and blocking larger particles from impacting the valve line.

Furthermore, the hardness of the valve core is higher than that of the valve seat after the surface of the valve core and the valve seat are subjected to heat treatment. Facilitating better engagement of the valve line when closed.

Compared with the prior art, the utility model provides a bypass valve has following beneficial effect:

1. the utility model installs the baffle plate at the lower part of the valve core, effectively protects the valve line of the valve core, effectively prevents the valve line, namely the valve core and the sealing surface of the valve seat from being damaged by the impact of water, foreign matters and the like in high temperature and high pressure steam, and slots are formed at the corresponding part of the valve seat to ensure the free up-and-down opening and closing of the valve core;

2. the utility model changes the guide sleeve of the prior art into the cage cover with the same outer diameter and the length extending to the valve seat, so that the steam flow can be adjusted, the pressure can be reduced, the noise can be reduced, compared with the prior art, the throttling of the cage cover can effectively reduce the impact force of water or foreign matters in the steam on the valve line when the valve is opened, and the damage of 'flash evaporation or cavitation' on the valve core and the valve seat is also reduced;

3. the inclined plane type sealing surface is replaced by a horizontal sealing surface, so that the probability of impact of water or foreign matters in high-temperature and high-pressure steam on the sealing surfaces of the valve core and the valve seat is reduced;

4. four or more through holes are symmetrically formed in the baffle groove corresponding to the valve seat, and the size of each through hole is determined according to specific conditions, so that foreign matters from the inlet pipeline can directly enter the outlet cage along the through holes under the action of high-speed steam flow, and the valve is prevented from being jammed when closed;

5. after the surfaces of the valve core and the valve seat are subjected to heat treatment, the hardness of the valve core is higher than that of the valve seat, so that the valve line can be better occluded when the valve core is closed.

Drawings

FIG. 1 is a schematic structural view of a modified front guide sleeve of a bypass valve.

FIG. 2 is a schematic diagram of a cage after the improvement of a bypass valve.

FIG. 3 is a schematic diagram of a bypass valve cartridge without a flapper.

FIG. 4 is a schematic diagram of a bypass valve spool plus flapper construction.

FIG. 5 is a schematic diagram of the valve seat of the bypass valve prior to opening the orifice.

FIG. 6 is a schematic illustration of a bypass valve after seat opening.

Wherein: 1-a valve body; 2-water inlet pipe; 3-water outlet pipe; 4-valve seat; 5-valve stem; 6-valve core; 7-covering; 8-connecting the channels; 9-inlet; 10-valve cover; 11-a screw; 12-a baffle plate; 13-a through hole; 14-holes; 15-outlet.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person having ordinary skill in the art without creative efforts shall belong to the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The present invention will be described in detail with reference to the drawings, and in order to describe the embodiments of the present invention in detail, the sectional views showing the structure of the components will not be enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Meanwhile, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or component to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted, connected and connected" in the present application are to be understood broadly, unless otherwise explicitly stated or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1 and 2, a bypass valve includes: the bypass valve comprises a valve cover 10, a valve body 1, a valve seat 4, a valve rod 5, a valve core 6, an inlet 9 and an outlet 15, wherein the valve cover 10 is installed on the valve body 1, a connecting channel 8 is arranged between the inlet 9 and the outlet 15 in the valve body 1, the valve seat 4 is installed on the valve body 1 at the lower part of the inner side of the inlet 9, the outlet 15 is arranged at the outer side of the lower part of the valve seat 4, the valve core 6 is movably installed above the valve seat 4, the valve core 6 is of a cylindrical structure, the valve core 6 and the valve rod 5 are installed into a whole, the valve core 6 moves up and down to be in contact with or separated from the valve seat 4 so as to open and close the connecting channel 8, the outer edge of the bottom of the valve core 6 is further connected with a baffle plate 12, the baffle plate 12 surrounds the valve core 6, the bottom of the cage 7 extends to the valve seat 4, the cage 4 is positioned at, the valve core 6 is surrounded, the cage 7 is in clearance fit with the valve core 6, and a passage through which gas or liquid flows is arranged on the cage 4.

Example 2

As shown in fig. 2 and 4, this embodiment is different from embodiment 1 in that: the bottom of the baffle 12 is slightly lower than the bottom surface of the valve core 6, and the annular baffle 12 and the valve core 6 are integrally formed. The upper surface of the valve seat 4 is provided with a circular groove, and when the valve core 6 is pressed on the valve seat 4, the baffle plate 12 just falls in the circular groove.

The height of the baffle 12 and the connection mode of the baffle 12 and the valve core 6 are further specified, the bottom of the annular baffle 12 is slightly lower than the bottom surface of the valve core 6, so that the sealing surface of the bottom of the valve core 6 is further protected, and meanwhile, the installation deviation of the annular baffle 12 in the installation process can be effectively prevented by the integrated forming mode.

The rest of the structure is the same as in example 1.

Example 3

As shown in fig. 3 and 4, unlike embodiment 1, the lowermost end of the valve body 6 is cylindrical, and the bottom thereof is a flat surface.

The bottom of the valve cover 10 is a circular column, and the bottom of the circular column is connected with the top of the cage 7. The bottom of the baffle 12 is lower than the bottom surface of the valve core 6 and is shielded outside the sealing surface of the valve core 6 and the valve seat 4, the upper surface of the valve seat 4 is provided with a circular groove, and when the valve core 6 is pressed on the valve seat 4, the baffle 12 falls in the circular groove. The baffle 12 is integrally formed with the valve element 6. The cage 7 is a circular column, and a hole 14 is formed in the circular column. A through hole 13 is arranged in the groove of the sealing surface of the valve seat, and the through hole 13 is communicated with the space at the upper part of the sealing surface and the connecting channel 8 at the lower part of the valve seat 4. The diameter of the through hole 13 is larger than that of the hole 14. The number of the through holes 13 is 4 symmetrically distributed. The hardness of the valve core 6 is higher than that of the valve seat 4 after the surface of the valve core 6 and the valve seat 4 are subjected to heat treatment.

The cage cover 7 can not only allow fluid to pass through, but also reduce the pressure of the fluid due to the porous structure, further reduce the impact of the fluid on the sealing surface, effectively reduce noise due to the porous structure, and block foreign matters.

Example 4

The working principle of the bypass valve of the utility model is as follows: when the sealing surface of the valve core 6 is pressed on the sealing surface of the valve seat 4, the whole valve is in a closed state.

Valve rod 5 upward movement when the valve is opened, case 6 upward movement, the valve is opened, export 15 is connected through the interface channel 8 in the valve body 1 with import 9, case 6 is around through the decompression of cage cover 7, valve rod 5 upward movement is easy before not changing, can easily open the valve, the fluid passes through import 9 and gets into, after carrying out the decompression through cage cover 7, the valve line suffers the probability greatly reduced that blows the loss, and newly-installed cage cover 7 still plays the effect of noise reduction, flow export 15 from valve seat 4 bottom after the processing of making an uproar falls.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A bypass valve comprising: the valve comprises a valve cover, a valve body, a valve seat, a valve rod, a valve core, an inlet and an outlet, wherein the valve cover is arranged on the upper part of the valve body, a connecting channel is arranged in the valve body between the inlet and the outlet, the valve seat is arranged on the lower part of the valve body, the lower part of the valve seat is the outlet of the bypass valve, the valve core is movably arranged above the valve seat, the valve core is of a cylindrical structure, the valve core and the valve rod are integrally arranged, the valve core moves up and down to be contacted with or separated from the valve seat so as to open and close the connecting channel, the valve is characterized in that the outer edge of the bottom of the valve core is connected with a baffle plate, the baffle plate surrounds the bottom of the valve core, a circular groove is arranged on the upper surface of the valve seat, the baffle plate freely moves up and down in the circular groove, the valve seat is arranged in an annular groove of the valve seat in a matched mode, the valve seat surrounds the outside of the valve core, the upper portion of the valve seat is connected with the bottom of the valve cover, the cage is in clearance fit with the valve core, a passage through which working media flow is arranged on the cage, and the annular groove is arranged on the outer side of the annular groove.

2. The bypass valve of claim 1, wherein said spool is cylindrical and has a horizontal bottom.

3. A bypass valve as recited in claim 1, wherein the lower portion of the valve cover is a circular flat surface, the circular flat surface contacting the top of the cage.

4. The bypass valve according to claim 1, wherein a bottom of said baffle plate is lower than a bottom surface of said valve element and is shielded from an outer side of a sealing surface of said valve element and said valve seat.

5. A bypass valve according to claim 1, wherein said through holes are four and evenly symmetrically arranged.

6. A bypass valve as recited in claim 1, wherein the flapper is integrally formed with the valve core.

7. A bypass valve according to claim 1, wherein the cage is sleeve-shaped and the passage through which the working fluid flows is a bore.

8. A bypass valve as claimed in claim 7, wherein the diameter of said through bore is greater than the diameter of said bore.

9. The bypass valve according to claim 1, wherein the hardness of said core is higher than that of said seat after heat treatment of the surfaces of said core and said seat.