CN213808953U

CN213808953U - Valve core and valve seat connecting node of high-pressure and low-pressure bypass valve

Info

Publication number: CN213808953U
Application number: CN202022859352.6U
Authority: CN
Inventors: 郝敬林; 杨建军; 李献荣; 孙超
Original assignee: Huaneng Weihai Power Generation Co Ltd
Current assignee: Huaneng Weihai Power Generation Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-07-27
Anticipated expiration: 2030-12-03

Abstract

The utility model belongs to the technical field of the valve structure technique and specifically relates to a height, low pressure bypass valve case disk seat connected node, it is equipped with the disk seat, be equipped with medium import and medium export on the disk seat, be equipped with the case on the disk seat between medium import and the medium export, the case is connected with the valve rod, be equipped with level four step hole on the characterized in that case, be connected through loose subassembly between the downthehole valve rod of level four step and the case, level four step hole outside-in divide into outer annular groove in proper order, the intermediate annular groove, inner ring groove and interior guiding hole, loose subassembly includes the apron, spacing end cover, the slip boss, reset spring, the preceding tip of valve rod is established to the guide bar, form the air guide clearance between inner ring groove and the guide bar, the pole portion of valve rod is equipped with the slip boss, valve rod portion cover has reset spring, the cover has spacing end cover on the valve rod of the rear end of slip boss, simple structure has, Convenient use, good sealing effect, low loss, energy conservation, emission reduction and the like.

Description

Valve core and valve seat connecting node of high-pressure and low-pressure bypass valve

Technical Field

The utility model belongs to the technical field of the valve structure technique and specifically relates to a simple structure, convenient to use, sealed effectual, the loss is low, energy saving and emission reduction's high, low pressure bypass valve case disk seat connected node.

Background

As is well known, the high-low pressure bypass valve of the 660MW unit of the existing power plant often has the phenomenon that the valve is not tightly closed after starting up in the use process, temperature reduction water needs to be added for temperature reduction, flushing marks are found on the valve core after the machine is stopped every time, surfacing repair is needed, the economic performance of the unit is greatly influenced by the non-tight closing of the valve, and the work of energy conservation and emission reduction is seriously influenced.

Disclosure of Invention

The utility model aims at solving the deficiencies of the prior art, providing a simple structure, convenient to use, sealed effectual, the loss is low, energy saving and emission reduction's high, low pressure bypass valve case disk seat connected node.

The utility model provides a technical scheme that its technical problem adopted is:

a valve core and valve seat connecting node of a high-pressure and low-pressure bypass valve is provided with a valve seat, a medium inlet and a medium outlet are arranged on the valve seat, a valve core for plugging the medium inlet and the medium outlet is arranged on the valve seat between the medium inlet and the medium outlet, and the valve core is connected with a valve rod, and is characterized in that a four-stage step hole is arranged on the valve core, the valve rod in the four-stage step hole is connected with the valve core through a loose assembly, the four-stage step hole is sequentially divided into an outer annular groove, a middle annular groove, an inner annular groove and an inner guide hole from outside to inside, the loose assembly comprises a cover plate, a limiting end cover, a sliding boss and a reset spring, the front end part of the valve rod is provided with a guide rod, the diameter of the guide rod is smaller than the rod part and is matched with the diameter of the inner guide hole, an air guide gap is formed between the inner annular groove and the guide rod, and the rod part of the valve rod at the rear end is provided with a raised sliding boss, the outer diameter of the sliding boss is matched with the inner diameter of the middle annular groove, a reset spring is sleeved on the rod part of the valve rod at the front end of the sliding boss, the reset spring is clamped between the sliding boss and the bottom of the middle annular groove, a limiting end cover is sleeved on the valve rod at the rear end of the sliding boss and fixed on the outer annular groove through an external cover plate, air guide holes which are communicated with each other and communicated with the air guide gap are formed in the limiting end cover and the sliding boss, and air holes which penetrate through the valve core are formed in the bottom of the inner annular groove and communicated with the air guide holes.

Rear end side circumference of case on be equipped with balanced sealing washer, balanced sealing washer warp sealing board, sealing bolt connect on the case rear end.

The outer circumference of the valve rod end face of valve rod and guide bar junction is equipped with annular back section, interior annular groove on be equipped with annular back section matched with section before the annular, be equipped with the elastic sealing pad before section and the annular after the annular on section, seal through the elastic sealing pad between section before section and the annular after the annular.

Inside and case mutually sealed cooperation junction of disk seat be equipped with sealed boss, it is protruding to circle in the sealed boss, the preceding terminal surface of case on be equipped with the protruding matched with annular groove of annular, the case injects the protruding inboard sealing that realizes the case front end of annular of disk seat through annular groove.

Annular arch of disk seat and case go up the interior annular groove that circles of annular groove junction and be equipped with the annular groove mouth of mutually supporting, the annular is cut open and is located annular arch and annular groove on and seal up each other through sealing surface respectively.

The outer wall of case on the cover have elastic sealing layer, elastic sealing layer and disk seat sealing connection.

The utility model discloses owing to adopt above-mentioned structure, have simple structure, convenient to use, sealed effectual, the loss is low, advantages such as energy saving and emission reduction.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in the attached drawings, the valve core and valve seat connecting node of the high-pressure and low-pressure bypass valve is provided with a valve seat 1, a medium inlet 2 and a medium outlet 3 are arranged on the valve seat 1 between the medium inlet 2 and the medium outlet 3, a valve core 4 for plugging the medium inlet 2 and the medium outlet 3 is arranged on the valve seat 1, and the valve core 4 is connected with a valve rod 5, and is characterized in that a four-stage step hole is arranged on the valve core 4, the valve rod 5 in the four-stage step hole is connected with the valve core 4 through a loose assembly, the four-stage step hole is sequentially divided into an outer annular groove 6, an intermediate annular groove 7, an inner annular groove 8 and an inner guide hole 9 from outside to inside, the loose assembly comprises a cover plate 10, a limiting end cover 11, a sliding boss 12 and a return spring 13, a guide rod 14 with the diameter smaller than the rod part of the valve rod 5 and matched with the diameter of the inner guide hole 9 is arranged at the front end part of the valve rod 5, an air guide gap 15 is formed between the inner annular groove 8 and the guide rod 14, the valve rod 5 at the rear end of the guide rod 14 is provided with a raised sliding boss 12, the outer diameter of the sliding boss 12 is matched with the inner diameter of the middle annular groove 7, the rod part of the valve rod 5 at the front end of the sliding boss 12 is sleeved with a return spring 13, the return spring 13 is clamped between the sliding boss 12 and the bottom of the middle annular groove 7, the valve rod 5 at the rear end of the sliding boss 12 is sleeved with a limit end cover 11, the limit end cover 11 is fixed on the outer annular groove 6 through an external cover plate 10, the limit end cover 11 and the sliding boss 12 are provided with air guide holes 16 which are mutually communicated and are communicated with the air guide gap 15, the bottom of the inner annular groove 8 is provided with air holes 17 which penetrate through the valve core 4, and the air guide holes 16, the air guide gap 15 and the air holes 17 are mutually communicated.

Furthermore, a balance sealing ring 18 is arranged on the circumference of the side surface of the rear end of the valve core 4, and the balance sealing ring 18 is connected to the rear end of the valve core 4 through a sealing plate 19 and a sealing bolt 20.

Furthermore, an annular rear section 21 is arranged on the outer circumference of the end face of the valve rod 5 at the joint of the valve rod 5 and the guide rod 14, an annular front section 22 matched with the annular rear section 21 is arranged on the inner annular groove 8, an elastic sealing gasket 23 is arranged on the annular rear section 21 and the annular front section 22, and the annular rear section 21 and the annular front section 22 are sealed through the elastic sealing gasket 23.

Further, a sealing boss 24 is arranged at the sealing fit connection position of the interior of the valve seat 1 and the valve core 4, an annular bulge 25 is arranged on the inner ring of the sealing boss 24, an annular groove 26 matched with the annular bulge 25 is arranged on the front end face of the valve core 4, and the valve core 4 is inserted into the annular bulge 25 of the valve seat 1 through the annular groove 26 to realize the sealing of the front end of the valve core 4.

Furthermore, the inner ring of the joint of the annular protrusion 25 of the valve seat 1 and the annular groove 26 of the valve core 4 is provided with annular notches which are matched with each other, and the annular protrusion 25 and the annular groove 26 at the annular notches are respectively sealed with each other through sealing surfaces 27.

Furthermore, the outer wall of the valve core 4 is sleeved with an elastic sealing layer 28, and the elastic sealing layer 28 is connected with the valve seat 1 in a sealing manner.

When the valve is used, the valve is arranged on a pipeline, then the valve rod 5 is connected with the speed reducer and the linear motor, the linear motor and the speed reducer drive the valve rod 5 to move, the closing torque of the valve is increased, in the moving process of the valve rod 5, because the valve rod 5 is movably connected with the valve core 4 through the reset spring 13, the valve rod and the sliding boss slide back and forth in the middle annular groove, the closing tightness between the valve core 4 and the valve is high, and because the elastic sealing layer 28 is sleeved on the outer wall of the valve core 4, the sealing structure of the front end of the valve core 4 and the valve body is connected, the sealing performance is better; because the temperature is about 200 ℃ behind the valve before the transformation, through the operation after the transformation, the temperature is under the condition of not dropping into the desuperheating water behind the valve at present, control is about 65 ℃, and the effect is very showing, has guaranteed unit safe operation, effectively reduces the unnecessary loss that the low side valve leaked and causes, for reducing the coal consumption, energy saving and emission reduction do the work, and nearly 150 ten thousand of single economic cost, only with imported component's 1/6 price, the utility model discloses owing to adopt above-mentioned structure, have simple structure, convenient to use, sealed effectual, the loss is low, energy saving and emission reduction advantage such as.

Claims

1. A valve core and valve seat connecting node of a high-pressure and low-pressure bypass valve is provided with a valve seat, a medium inlet and a medium outlet are arranged on the valve seat, a valve core for plugging the medium inlet and the medium outlet is arranged on the valve seat between the medium inlet and the medium outlet, and the valve core is connected with a valve rod, and is characterized in that a four-stage step hole is arranged on the valve core, the valve rod in the four-stage step hole is connected with the valve core through a loose assembly, the four-stage step hole is sequentially divided into an outer annular groove, a middle annular groove, an inner annular groove and an inner guide hole from outside to inside, the loose assembly comprises a cover plate, a limiting end cover, a sliding boss and a reset spring, the front end part of the valve rod is provided with a guide rod, the diameter of the guide rod is smaller than the rod part and is matched with the diameter of the inner guide hole, an air guide gap is formed between the inner annular groove and the guide rod, and the rod part of the valve rod at the rear end is provided with a raised sliding boss, the outer diameter of the sliding boss is matched with the inner diameter of the middle annular groove, a reset spring is sleeved on the rod part of the valve rod at the front end of the sliding boss, the reset spring is clamped between the sliding boss and the bottom of the middle annular groove, a limiting end cover is sleeved on the valve rod at the rear end of the sliding boss and fixed on the outer annular groove through an external cover plate, air guide holes which are communicated with each other and communicated with the air guide gap are formed in the limiting end cover and the sliding boss, and air holes which penetrate through the valve core are formed in the bottom of the inner annular groove and communicated with the air guide holes.

2. The connection node of valve core and valve seat of high-pressure and low-pressure bypass valve as claimed in claim 1, wherein the circumference of the rear end face of the valve core is provided with a balance sealing ring, and the balance sealing ring is connected to the rear end of the valve core through a sealing plate and a sealing bolt.

3. The valve core and valve seat connecting joint of the high-pressure and low-pressure bypass valve as claimed in claim 1, wherein the outer circumference of the end face of the valve rod at the joint of the valve rod and the guide rod is provided with an annular rear section, the inner annular groove is provided with an annular front section matched with the annular rear section, the annular rear section and the annular front section are provided with elastic sealing gaskets, and the annular rear section and the annular front section are sealed through the elastic sealing gaskets.

4. The joint of claim 1, wherein a sealing boss is provided at the sealing fit connection between the inside of the valve seat and the valve element, an annular protrusion is provided on the inner ring of the sealing boss, an annular groove fitted with the annular protrusion is provided on the front end surface of the valve element, and the valve element is inserted into the annular protrusion of the valve seat through the annular groove to seal the front end of the valve element.

5. The valve core and valve seat connecting joint of the high-pressure and low-pressure bypass valve as claimed in claim 4, wherein the inner ring of the connecting part of the annular protrusion of the valve seat and the annular groove on the valve core is provided with annular notches which are matched with each other, and the annular protrusion at the annular notches and the annular groove are respectively sealed with each other through sealing surfaces.

6. The connection node of the valve core and the valve seat of the high-pressure and low-pressure bypass valve as claimed in claim 1, wherein the outer wall of the valve core is sleeved with an elastic sealing layer, and the elastic sealing layer is connected with the valve seat in a sealing manner.