Energy-saving double-valve-plate sealing valve

Abstract

The utility model relates to an energy-saving type double-valve-plate sealing valve which comprises a valve body and a valve shaft, the valve shaft penetrates through the valve body, a valve plate assembly is installed on the valve shaft in the valve body, the valve plate assembly comprises a first valve plate and a second valve plate which are arranged on the left side and the right side, and the first valve plate and the second valve plate are staggered in a high-low mode. Heat insulation cotton is filled between the first valve plate and the second valve plate, and the inner wall of the valve body is provided with a first sealing plate and a second sealing plate corresponding to the first valve plate and the second valve plate respectively. According to the utility model, by arranging the high-low staggered double-layer valve plates, the overall sealing performance is greatly improved; a heat insulation measure is arranged between the two valve plates, so that heat loss is greatly reduced; soft seals are arranged between the valve plate and the sealing plate and between the valve plate and the valve shaft sleeve, so that leakage points are reduced; the valve shaft sleeve is sealed in a pressing mode, and gap leakage caused by shaft end thermal expansion during thermal-state operation is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves for smoke and air ducts, and in particular to an energy-saving double-valve plate sealing valve. Background Art

[0002] Existing flue (air) duct sealing butterfly valves are a key component of the flue and air duct system for waste heat recovery in petrochemical plant heating furnaces. These valves intercept and redirect flue gas flow. When the flue gas pressure from waste heat recovery falls below a set value, the valves, interlocked with the DCS or SIS system, rapidly open or close, allowing the flue gas to be discharged through a bypass system, protecting the plant's safe operation. The control of flue gas leakage during the closed state of the sealing butterfly valve directly impacts the thermal efficiency of the heating furnace system, necessitating the design of an energy-saving double-disc sealing valve. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide an energy-saving double-valve plate sealing valve, which greatly improves the overall sealing performance by arranging double-layer valve plates with high and low offsets; provides heat insulation measures between the two valve plates to greatly reduce heat loss; provides soft seals between the valve plate and the sealing plate, and between the valve plate and the valve shaft sleeve to reduce leakage points; the valve shaft sleeve adopts a compression seal to prevent gap leakage caused by thermal expansion of the shaft end during hot operation.

[0004] The purpose of this utility model is achieved in this way:

[0005] An energy-saving double-valve plate sealing valve includes a valve body and a valve shaft. The valve shaft passes through the valve body. A valve plate assembly is installed on the valve shaft in the valve body. The valve plate assembly includes a first valve plate and a second valve plate provided on the left and right. The first valve plate and the second valve plate are staggered in height. Insulating cotton is filled between the first valve plate and the second valve plate. The inner wall of the valve body is provided with a first sealing plate and a second sealing plate corresponding to the first valve plate and the second valve plate respectively.

[0006] Preferably, the edges of the first valve plate and the second valve plate are both installed with flexible sealing sheets. When the valve plate assembly is closed, the first valve plate and the second valve plate are respectively fitted with the corresponding flexible sealing sheets.

[0007] Preferably, a sealing pressure plate is provided on the side of the sealing plate flexible sealing sheet away from the first valve plate and the second valve plate. The first valve plate and the second valve plate are respectively clamped between the corresponding sealing plate flexible sealing sheet and the sealing pressure plate and locked by bolts.

[0008] Preferably, the first valve plate and the second valve plate are connected to the valve shaft via a valve plate connecting plate, and the first valve plate and the second valve plate on the same side are connected to a valve plate connecting plate, which is sleeved and fixed on the valve shaft.

[0009] Preferably, a compression seal structure is arranged between the valve shaft and the valve body, the compression seal structure comprising a valve shaft sleeve and a seal gland, the valve shaft sleeve being sleeved on the valve shaft and located in the valve body outside the valve plate connecting plate of the valve plate assembly, and the seal gland being locked with the valve body by a stud and a nut to compress the valve shaft sleeve.

[0010] Preferably, a compression spring is sleeved on the seal gland, and an inner side of the compression spring abuts against an outer end surface of the valve shaft sleeve.

[0011] Preferably, an inner side of the seal gland protrudes into the valve shaft sleeve, a plurality of sealing packing and a screw rod are sequentially arranged in the valve shaft sleeve from inside to outside, the seal gland abuts against the screw rod, and the screw rod compresses the sealing packing inwardly through the seal gland.

[0012] Preferably, a lip-shaped sealing ring is arranged between the valve shaft and the seal gland, and a heat insulation block is further embedded in the seal gland and located inside the lip-shaped sealing ring.

[0013] Preferably, the first valve plate and the second valve plate are provided with avoiding notches corresponding to the valve shaft sleeve, and a shaft sleeve flexible sealing sheet is arranged at the avoiding notches of the first valve plate and the second valve plate, the shaft sleeve flexible sealing sheet is fixed with the corresponding valve plate through a sealing pressing plate, and the shaft sleeve flexible sealing sheet is attached to the valve shaft sleeve.

[0014] Preferably, when the shaft sleeve flexible sealing sheet and the sealing plate flexible sealing sheet are located on the same side of the corresponding sealing plate, the shaft sleeve flexible sealing sheet is formed by extension of the sealing plate flexible sealing sheet.

[0015] The utility model discloses the beneficial effects are:

[0016] By setting high and low misaligned double-layer valve plate, greatly improve the overall sealing property;

[0017] Between two valve plates, set up heat insulation measure, greatly reduce heat loss;

[0018] Between valve plate and sealing plate, between valve plate and valve shaft sleeve, set up soft seal, reduce leakage point;

[0019] Valve shaft sleeve adopts compression seal, prevents the clearance leakage of the thermal expansion of shaft end when running in hot state. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure diagram of energy-saving double valve plate seal valve of the utility model.

[0021] Figure 2 It is Figure 1 A-A section view of.

[0022] Figure 3 It is Figure 1A local enlarged view at I.

[0023] Figure 4 A local enlarged view at I. Figure 2 A local enlarged view at II.

[0024] Figure 5 A side view of the valve plate assembly.

[0025] Figure 6 A local enlarged view at I. Figure 3 A view from B (schematic view of the assembly at the gap between the valve plate and the valve plate sleeve).

[0026] Wherein:

[0027] Valve body 1; valve shaft 2; first valve plate 3; second valve plate 4; valve plate connecting plate 5; thermal insulation cotton 6; first sealing plate 7; second sealing plate 8; sealing plate flexible sealing piece 9; sealing pressing plate 10; valve shaft sleeve 11; sealing packing 12; screw 13; sealing gland 14; stud 15; compression spring 16; lip seal 17; thermal insulation block 18; sleeve flexible sealing piece 19. DETAILED DESCRIPTION

[0028] Referring to Figure 1-6 The utility model relates to an energy-saving double valve plate sealing valve, including valve body 1 and valve shaft 2, the valve shaft 2 passes through valve body 1, and the valve shaft 2 in valve body 1 is installed with valve plate assembly, the valve plate assembly includes first valve plate 3 and second valve plate 4 that are staggered and arranged left and right, first valve plate 3 and second valve plate 4 are connected valve shaft 2 through valve plate connecting plate 5, two valve plate connecting plates 5 are arranged at the front and rear ends of valve plate assembly, and first valve plate 3 and second valve plate 4 on the same side of front and back are connected with a valve plate connecting plate 5, and valve plate connecting plate 5 is sleeved and fixed on valve shaft 2. First valve plate 3 and second valve plate 4 are staggered in height, and thermal insulation cotton 6 is filled between first valve plate 3 and second valve plate 4. The inner wall of valve body 1 is provided with first sealing plate 7 and second sealing plate 8 corresponding to first valve plate 3 and second valve plate 4 respectively, and first sealing plate 7 and second sealing plate 8 are fixed with valve body 1 through bolts, and according to the sealing need, the fitting degree between the sealing plate and the corresponding valve plate can be adjusted through the bolt.

[0029] The edge of first valve plate 3, second valve plate 4 is all installed with sealing plate flexible sealing piece 9, and first valve plate 3, second valve plate 4 are fitted with corresponding sealing plate flexible sealing piece 9 under the closed state of valve plate assembly, to realize soft sealing. The side, away from first valve plate 3, second valve plate 4 of sealing plate flexible sealing piece 9 is all equipped with sealing pressing plate 10, and first valve plate 3, second valve plate 4 are respectively clamped between corresponding sealing plate flexible sealing piece 9 and sealing pressing plate 10, and are locked through bolt.

[0030] The flexible sealing piece 9 of the sealing plate is segmented into upper and lower segments, and the upper and lower segments of the same flexible sealing piece 9 are staggered and arranged on the left and right sides of the corresponding valve plate.

[0031] In order to prevent the leakage of flue gas or air in the valve from the gap between the valve shaft 2 and the valve body 1, a compression sealing structure is arranged between the valve shaft 2 and the valve body 1, which comprises a valve shaft sleeve 11, sealing packing 12, a screw rod 13 and a sealing gland 14, the valve shaft sleeve 11 is sleeved on the valve shaft 2 and located in the valve body 1 outside the valve plate connecting plate 5 of the valve plate assembly, a plurality of sealing packing 12, screw rod 13 and sealing gland 14 are sequentially arranged in the valve shaft sleeve 11 from inside to outside, the sealing gland 14 is locked with the valve body 1 through the stud 15 and nut, the sealing packing 12 is compressed inwardly by the sealing gland 14 through the screw rod 13, the sealing gland 14 is sleeved with a compression spring 16, the inner side of the compression spring 16 abuts against the outer end surface of the valve shaft sleeve 11, so as to compress the valve shaft sleeve 11 and prevent the gap leakage caused by the thermal expansion of the shaft end in the hot state.

[0032] The lip-shaped sealing ring 17 is arranged between the valve shaft 2 and the sealing gland 14, and the heat insulation block 18 is embedded in the sealing gland 17, which is arranged on the inner side of the lip-shaped sealing ring 17, so as to prevent the damage of the lip-shaped sealing ring caused by the high-temperature medium in the hot state.

[0033] The front and rear ends of the first valve plate 3 and the second valve plate 4 are provided with avoiding notches corresponding to the valve shaft sleeve 11, in order to prevent the leakage of flue gas or air from the gap between the valve plate and the valve shaft sleeve 11, the shaft sleeve flexible sealing piece 19 is arranged at the avoiding notches of the first valve plate 3 and the second valve plate 4, the shaft sleeve flexible sealing piece 19 is fixed with the corresponding valve plate through the sealing pressing plate 10, and the shaft sleeve flexible sealing piece 19 is attached to the valve shaft sleeve 11.

[0034] When the shaft sleeve flexible sealing piece 19 and the sealing plate flexible sealing piece 9 are located on the same side of the corresponding sealing plate, the shaft sleeve flexible sealing piece 19 can be extended from the sealing plate flexible sealing piece 9; when the shaft sleeve flexible sealing piece 19 and the sealing plate flexible sealing piece 9 are located on both sides of the corresponding sealing plate, the sealing plate flexible sealing piece 9 cannot act as the shaft sleeve flexible sealing piece 19, and the shaft sleeve flexible sealing piece 9 needs to be installed separately.

[0035] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by using equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model claims.

Claims

1. An energy-saving double-valve plate sealing valve, comprising a valve body and a valve shaft, wherein the valve shaft passes through the valve body, and is characterized in that: A valve plate assembly is installed on the valve shaft in the valve body, and the valve plate assembly includes a first valve plate and a second valve plate on the left and right. The first valve plate and the second valve plate are staggered in height, and the space between the first valve plate and the second valve plate is filled with heat insulation cotton. The inner wall of the valve body is respectively provided with a first sealing plate and a second sealing plate corresponding to the first valve plate and the second valve plate.

2. The energy-saving double-valve plate sealing valve according to claim 1, characterized in that: The edges of the first valve plate and the second valve plate are both installed with flexible sealing sheets. When the valve plate assembly is closed, the first valve plate and the second valve plate are respectively fitted with the corresponding flexible sealing sheets.

3. The energy-saving double-valve plate sealing valve according to claim 2, characterized in that: A sealing pressure plate is provided on the side of the sealing plate flexible sealing sheet away from the first valve plate and the second valve plate. The first valve plate and the second valve plate are respectively clamped between the corresponding sealing plate flexible sealing sheet and the sealing pressure plate and locked by bolts.

4. The energy-saving double-valve plate sealing valve according to claim 1, characterized in that: The first valve plate and the second valve plate are connected to the valve shaft via a valve plate connecting plate. The first valve plate and the second valve plate on the same side are connected to a valve plate connecting plate, and the valve plate connecting plate is sleeved and fixed on the valve shaft.

5. The energy-saving double-valve plate sealing valve according to claim 1 or 2, characterized in that: A compression sealing structure is provided between the valve shaft and the valve body, and the compression sealing structure includes a valve shaft sleeve and a sealing cover. The valve shaft sleeve is sleeved on the valve shaft and is located inside the valve body and outside the valve plate connecting plate of the valve plate assembly. The sealing cover is locked with the valve body by studs and nuts to compress the valve shaft sleeve.

6. The energy-saving double-valve plate sealing valve according to claim 5, characterized in that: The outer sleeve of the sealing gland is provided with a compression spring, and the inner side of the compression spring abuts against the outer end surface of the valve shaft sleeve.

7. The energy-saving double-valve plate sealing valve according to claim 5, characterized in that: The inner side of the sealing gland extends out of the valve sleeve, and the valve sleeve is provided with multiple sealing packings and screws from the inside to the outside. The sealing gland presses against the screw, and the screw presses the sealing packing inward through the sealing gland.

8. The energy-saving double-valve plate sealing valve according to claim 5, characterized in that: A lip seal is provided between the side of the valve shaft close to the atmosphere and the sealing gland. A heat insulation block is embedded in the sealing gland and is arranged on the inner side of the lip seal.

9. The energy-saving double-valve plate sealing valve according to claim 5, characterized in that: The front and rear ends of the first valve plate and the second valve plate are provided with avoidance gaps corresponding to the valve sleeves, and the avoidance gaps of the first valve plate and the second valve plate are provided with sleeve flexible sealing sheets. The sleeve flexible sealing sheets are fixed to the corresponding valve plates through sealing pressure plates, and the sleeve flexible sealing sheets are in contact with the valve sleeves.

10. The energy-saving double-valve plate sealing valve according to claim 9, characterized in that: When the shaft sleeve flexible sealing sheet and the sealing plate flexible sealing sheet are located on the same side of the corresponding sealing plate, the shaft sleeve flexible sealing sheet is formed by extending the sealing plate flexible sealing sheet.

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