CN213512256U

CN213512256U - Safety valve with seat returning adjusting function

Info

Publication number: CN213512256U
Application number: CN202022529229.8U
Authority: CN
Inventors: 陈路路; 王海庄; 王德军; 迮晓锋; 陈强; 凌飞; 潘伟文; 迮锦涛; 姜浩; 王大伟
Original assignee: Wujiang Dongwu Machine Co ltd
Current assignee: Wujiang Dongwu Machine Co ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-06-22
Anticipated expiration: 2030-11-05

Abstract

The utility model relates to a relief valve with return seat regulatory function, including the valve body that has import and export, the disk seat of setting in the import department of valve body, the uide bushing of connection in the valve body, movably the valve clack seat of connecting in the uide bushing, the valve clack of connection on the valve clack seat, the valve rod that the lower extreme penetrated the valve body and was connected with the valve clack, the valve rod drives the valve clack and carries out sealed cooperation with the disk seat, still including returning seat adjusting part, establish the first circle body in the uide bushing outside including the cover, set up the adjustable ring in the first circle body outside, set up porosely on the first circle body, adjustable ring adjustable hole's size, the valve clack seat, first circle body, form the cavity between the uide bushing, the. The utility model discloses not only realize the regulation of recoil pressure and discharge pressure through adjusting relief valve curtain area, still the steam medium that the clearing hole discharged the relief valve realizes the secondary regulation to recoil pressure, and is bigger than original upper control circle structure control range, and recoil pressure can reach more than 95% the pressure of adjusting.

Description

Safety valve with seat returning adjusting function

Technical Field

The utility model relates to a relief valve with return seat regulatory function.

Background

As shown in fig. 1, the safety valve structure for steam in the prior art generally adopts an upper and lower dual-regulating ring structure, and both the upper and lower regulating rings can achieve the effect of regulating the discharge pressure and the recoil pressure; the respective adjusting effects are different, and the lower adjusting ring is generally used for adjusting the discharge pressure of the safety valve and playing an auxiliary role in returning to the seat; the upper regulating ring generally mainly regulates the recoil pressure of the safety valve and plays an auxiliary role in discharging pressure.

Although the existing upper and lower regulating ring technology can realize the recoil pressure regulation, the regulating effect is limited, the recoil pressure of the safety valve can generally reach 93% of the setting pressure, the realization of higher recoil pressure is difficult (such as 95% of the setting pressure), and the important steam safety valve for nuclear power has strict limitation on the recoil pressure (such as a main steam safety valve and a voltage stabilizer safety valve), and generally more than 95% is required.

Therefore, it is necessary to design an adjusting ring structure with better adjusting performance to realize adjustment of higher recoil pressure.

Disclosure of Invention

The utility model aims at providing a relief valve with return seat regulatory function.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a safety valve with a back seat adjusting function comprises a valve body with an inlet and an outlet, a valve seat arranged at the inlet of the valve body, a guide sleeve connected in the valve body, a valve flap seat movably connected in the guide sleeve, a valve flap connected on the valve flap seat, a valve rod with the lower end penetrating into the valve body and connected with the valve flap, the valve rod drives the valve clack to be in sealing fit with the valve seat, the safety valve also comprises a back seat adjusting component, the return seat adjusting component comprises a first ring body sleeved outside the guide sleeve and an adjusting ring arranged outside the first ring body, the first ring body is provided with a hole, the adjusting ring can adjust the size of the hole, a cavity is formed among the valve flap seat, the first ring body and the guide sleeve, and the cavity is communicated with the hole.

Preferably, a valve cavity is formed between the inlet and the outlet of the valve body, and the hole is communicated with the valve cavity and the chamber.

Preferably, the hole is opened with a plurality of holes.

Further preferably, a plurality of the holes are opened on the same plane.

Preferably, the adjusting ring can move along the axial direction of the first ring body and adjust the size of the hole.

Preferably, the first ring body can move and adjust along the guide sleeve, and when the first ring body moves towards the direction close to the valve seat, the area of the curtain is reduced; when the first ring body moves towards the direction far away from the valve seat, the area of the curtain is increased.

Further preferably, the seat-returning adjusting assembly further comprises a first adjusting member for controlling the movement of the first ring body, and the first adjusting member is disposed on the valve body.

Preferably, the reseating adjustment assembly further comprises a second ring body arranged on the valve seat, the second ring body can move and adjust along the axial direction of the second ring body, and the area of the curtain is reduced when the second ring body moves towards the direction close to the valve clack; when the second ring body moves towards the direction far away from the valve clack, the area of the curtain is increased.

Further preferably, the seat-returning adjusting assembly further comprises a second adjusting member for controlling the movement of the second ring body, and the second adjusting member is disposed on the valve body.

Preferably, the safety valve further comprises a bellows assembly, one end of the bellows assembly is connected with the valve flap, and the other end of the bellows assembly is connected with the guide sleeve.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a recoil pressure control structure, the regulation of recoil pressure and discharge pressure is realized to the curtain area that not only the accessible was adjusted the relief valve, can also realize the secondary regulation to recoil pressure by the steam medium that the clearing hole discharged the relief valve, and is bigger than original upper control circle structure control range, and recoil pressure can reach more than 95% the pressure of adjusting.

Drawings

FIG. 1 is a schematic view of a safety valve according to the prior art;

FIG. 2 is a partial schematic structural view of the safety valve of the present embodiment;

fig. 3 is a schematic diagram of the medium flow when the safety valve is opened in the present embodiment.

In the above drawings: 1. a valve body; 2. a valve seat; 3. a guide sleeve; 4. a valve flap seat; 5. a valve flap; 6. a valve stem; 71. a first ring body; 711. an aperture; 72. a first adjustment member; 73. a second ring body; 74. a second adjustment member; 75. an adjusting ring; 8. a bellows assembly; 91. a valve cavity; 92. a chamber.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 2, a safety valve with a seat returning adjusting function comprises a valve body 1 with an inlet and an outlet, a valve seat 2 arranged at the inlet of the valve body 1, a guide sleeve 3 connected in the valve body 1, a valve flap seat 4 movably connected in the guide sleeve 3, a valve flap 5 connected on the valve flap seat 4, a valve rod 6 with the lower end penetrating into the valve body 1 and connected with the valve flap 5, and a seat returning adjusting component arranged in the valve body 1. The valve clack 5 is fixed on the valve clack seat 4, the valve rod 6 drives the valve clack 5 and the valve clack seat 4 to move together along the axial direction of the guide sleeve 3, the moving range is limited in the distance between the guide sleeve 3 and the valve seat 2, and the valve clack 5 is in sealing fit with the valve seat 2. A valve chamber 91 is formed in the valve body 1 between the inlet and the outlet of the valve body 1 for discharging the discharged medium in the valve seat 2 from the valve body 1.

The reseating adjusting assembly comprises a first ring body 711 which is sleeved on the guide sleeve 3 and can move along the axial direction of the guide sleeve, a first adjusting piece 72 arranged on the valve body 1, a second ring body 73 which is sleeved on the valve seat 2 and can move along the axial direction of the valve seat, a second adjusting piece 74 arranged on the valve body 1, and an adjusting ring 75 which is sleeved on the first ring body 711. The first ring body 711 is provided with a hole 711, the size of the hole 711 can be adjusted by moving the adjusting ring 75, a cavity 92 is formed among the valve clack seat 4, the first ring body 711 and the guide sleeve 3, and the cavity 92 is communicated with the valve cavity 91 through the hole 711. The pressure in the chamber 92 acts on the flap seat 4 to build a downward pressure to ease the valve reseating. When the safety valve is opened, the medium enters the chamber 92 through the clearance of the parts and then enters the valve cavity 91 through the hole 711, as shown in fig. 3, the pressure in the chamber 92 can be adjusted by adjusting the size of the hole 711, so that the discharge pressure and the recoil pressure of the safety valve can be adjusted more conveniently. Preferably, the holes 711 are opened in a plurality and located on the same plane, and the adjusting ring 75 can simultaneously adjust the size of the holes 711 when moving on the first ring 711.

The recoating adjusting assembly adjusts the size of the area of a discharge curtain of the safety valve by adjusting the positions of the first ring body 711 and the second ring body 73, so that the discharge pressure and the recoating pressure of the safety valve are adjusted, the first ring body 711 and the second ring body 73 are respectively connected with the guide sleeve 3 and the valve seat 2 through threads, the position can be conveniently adjusted, the first adjusting piece 72 is used for adjusting the position of the first ring body 711, and the second adjusting piece 74 is used for adjusting the position of the second ring body 73. When the first ring body 711 moves towards the direction close to the valve seat 2, the area of the curtain is reduced; when the first ring body 711 moves away from the valve seat 2, the area of the curtain is increased; when the second ring body 73 moves towards the direction close to the valve clack 5, the area of the curtain is reduced; when the second ring body 73 moves away from the valve flap 5, the area of the curtain increases. The area of curtain reduces, is favorable to opening of relief valve and realizes higher discharge pressure, is unfavorable for the medium to discharge and the seat that returns of relief valve, and it is lower to return seat pressure, and the area increase of curtain is unfavorable for opening of relief valve and realizes higher discharge pressure, is favorable to the medium to discharge and the seat that returns of relief valve, and it is lower to return seat pressure. The dual-recoil pressure adjusting structure has a wider recoil pressure adjusting range, and can realize the adjustment of the high recoil pressure of the safety valve.

The safety valve further comprises a bellows assembly 8 connected between the valve clack 5 and the guide sleeve 3, and the bellows assembly 8 plays a role in balancing back pressure and preventing external leakage when the valve clack 5 receives upward thrust, and also can play a role in preventing corrosion of internal parts.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A safety valve with a back seat adjusting function, comprising a valve body having an inlet and an outlet, a valve seat disposed at the inlet of the valve body, a guide sleeve connected inside the valve body, a valve flap seat movably connected inside the guide sleeve, a valve flap connected to the valve flap seat, and a valve stem having a lower end penetrating into the valve body and connected to the valve flap, the valve stem driving the valve flap to sealingly engage with the valve seat, characterized in that: the safety valve further comprises a seat returning adjusting assembly, the seat returning adjusting assembly comprises a first ring body and an adjusting ring, the first ring body is sleeved on the outer side of the guide sleeve, the adjusting ring is arranged on the outer side of the first ring body, a hole is formed in the first ring body, the size of the hole can be adjusted through the adjusting ring, a cavity is formed among the valve flap seat, the first ring body and the guide sleeve, and the cavity is communicated with the hole.

2. The safety valve with a reseating adjustment function according to claim 1, characterized in that: a valve cavity is formed between the inlet and the outlet of the valve body, and the hole is communicated with the valve cavity and the cavity.

3. The safety valve with a reseating adjustment function according to claim 1, characterized in that: the holes are provided with a plurality of holes.

4. A safety valve with a reseating adjustment function according to claim 3, characterized in that: the holes are arranged on the same plane.

5. The safety valve with a reseating adjustment function according to claim 1, characterized in that: the adjusting ring can move along the axial direction of the first ring body and adjust the size of the hole.

6. The safety valve with a reseating adjustment function according to claim 1, characterized in that: the first ring body can move and adjust along the guide sleeve, and when the first ring body moves towards the direction close to the valve seat, the area of the curtain is reduced; when the first ring body moves towards the direction far away from the valve seat, the area of the curtain is increased.

7. The safety valve with a reseating adjustment function according to claim 6, characterized in that: the seat returning adjusting assembly further comprises a first adjusting piece used for controlling the first ring body to move, and the first adjusting piece is arranged on the valve body.

8. The safety valve with a reseating adjustment function according to claim 1 or 6, characterized in that: the seat returning adjusting assembly further comprises a second ring body arranged on the valve seat, the second ring body can move and adjust along the axial direction of the second ring body, and when the second ring body moves towards the direction close to the valve clack, the area of the curtain is reduced; when the second ring body moves towards the direction far away from the valve clack, the area of the curtain is increased.

9. The safety valve with a reseating adjustment function according to claim 8, characterized in that: the seat returning adjusting assembly further comprises a second adjusting piece used for controlling the second ring body to move, and the second adjusting piece is arranged on the valve body.

10. The safety valve with a reseating adjustment function according to claim 1, characterized in that: the safety valve also comprises a bellows assembly, wherein one end of the bellows assembly is connected with the valve clack, and the other end of the bellows assembly is connected with the guide sleeve.