WO2020186431A1 - Ensemble bouchon d'étanchéité - Google Patents

Ensemble bouchon d'étanchéité Download PDF

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Publication number
WO2020186431A1
WO2020186431A1 PCT/CN2019/078581 CN2019078581W WO2020186431A1 WO 2020186431 A1 WO2020186431 A1 WO 2020186431A1 CN 2019078581 W CN2019078581 W CN 2019078581W WO 2020186431 A1 WO2020186431 A1 WO 2020186431A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
annular
assembly
ring
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/078581
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English (en)
Chinese (zh)
Inventor
胡惠文
陈庭育
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technology On Prototyping Ultimate Co Ltd
Original Assignee
Technology On Prototyping Ultimate Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technology On Prototyping Ultimate Co Ltd filed Critical Technology On Prototyping Ultimate Co Ltd
Priority to PCT/CN2019/078581 priority Critical patent/WO2020186431A1/fr
Publication of WO2020186431A1 publication Critical patent/WO2020186431A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
    • A23B2/00—Preservation of foods or foodstuffs, in general
    • A23B2/10—Preservation of foods or foodstuffs, in general by treatment with pressure variation, shock, acceleration or shear stress

Definitions

  • the invention relates to a sealing plug assembly, in particular to a sealing plug assembly in which a guide ring and a sealing ring each have mutually matched continuous slopes.
  • HPP high pressure processing
  • ultra-high pressure technology refers to packaging food in a flexible airtight container, using liquid (usually water) as a medium for transmitting pressure, so that it exists in an ultra-high pressure (for example, 100MPa or more) environment, and at the same time matching appropriate time and temperature (For example, below 50°C), the physical treatment of food is carried out to achieve the purpose of food processing, preservation and sterilization.
  • the opening of a pressure tank for high-pressure processing of food is usually blocked by a sealing plug to prevent liquid leakage.
  • a sealing plug to prevent liquid leakage.
  • the tightness between the sealing plug and the pressure barrel is getting higher and higher, and due to the effect of high pressure, the sealing ring is prone to deformation and sealing.
  • the present invention is to provide a sealing plug assembly, thereby solving the jamming problem of the sealing plug and the pressure cylinder described in the prior art.
  • a sealing plug assembly disclosed in an embodiment of the present invention includes a plug body, a guide ring, a sealing ring, and an elastic reset member.
  • the plug body has an annular outer wall surface and a first annular assembly groove.
  • the annular outer wall surface has a plug-in side edge and an exposed side edge opposite to each other.
  • the first annular assembling groove is located on the annular outer wall surface and between the inserted side edge and the exposed side edge.
  • the guide ring is sleeved on the plug body and located in the first annular assembly groove.
  • the guide ring has a first continuous slope.
  • the first continuous slope has a first side and a second side opposite to each other.
  • the first side is closer to the exposed side edge than the second side, and the distance from the first side to the central axis of the plug body is greater than the distance from the second side to the central axis of the plug body.
  • the sealing ring is sleeved on the plug body and located in the first annular assembly groove, and the sealing ring is farther from the exposed side edge than the guide ring.
  • the sealing ring has a second continuous slope, and the second continuous slope matches the first continuous slope.
  • the elastic reset piece is sleeved on the sealing ring.
  • the plug body has a groove bottom surface located on one side of the first annular assembly groove, the sealing ring further has an inner surface and at least one annular groove, the inner surface faces the groove bottom surface, and one side of the inner surface is connected to the groove bottom surface. At least one annular groove is recessed from the inner surface of the second continuous slope.
  • the sealing plug assembly further includes a non-leak ring, and the non-leak ring is disposed in at least one of the annular grooves.
  • the number of at least one annular groove is multiple, and the plurality of annular grooves are arranged along the direction of the inserted side edge toward the exposed side edge.
  • the sealing plug assembly further includes a non-leak ring, which is disposed in one of the annular grooves closest to the exposed side edge.
  • the included angle between the second continuous inclined surface and the bottom surface of the groove is between 30 degrees and 60 degrees.
  • the included angle between the second continuous inclined surface and the bottom surface of the groove is 45 degrees.
  • the sealing ring further has an outer surface and a circular arc surface, the outer surface is opposite to the inner surface, and two opposite ends of the circular arc surface are respectively connected with the outer surface and the second continuous inclined surface away from the inner surface.
  • the sealing ring further has a side surface and a second annular assembly groove.
  • the side surface and the second continuous slope are located between the inner surface and the outer surface.
  • the side surface and the second continuous slope are connected to two opposite sides of the inner surface.
  • two adjacent sides of the second annular assembly groove are respectively connected to the outer surface and the side surface, and the elastic reset member is arranged in the second annular assembly groove.
  • the sealing ring further has a first groove side surface and a second groove side surface that are connected to each other.
  • the first groove side surface and the second groove side surface jointly form the second annular assembly groove, and the first groove side surface is away from the second groove
  • One side of the side surface is connected to the outer surface, the side of the second groove side away from the side of the first groove is connected to the side surface, and the junction of the first groove side surface and the second groove side surface forms a first connection line.
  • the junction of the surface and the second continuous slope forms a second connection line, and the first connection line and the second connection line are both located on the same plane perpendicular to the central axis of the plug body.
  • the ratio of the length of the side surface in the direction perpendicular to the central axis of the plug body to the distance between the inner surface and the outer surface in the direction perpendicular to the central axis of the plug body is between 5/18 and 12/18 between.
  • a groove is provided on the side of the elastic reset member away from the guide ring.
  • the sealing plug assembly of the above embodiment since the first side of the first continuous slope of the guide ring is farther from the central axis of the plug body than the second side, and the sealing ring has a second continuous slope that matches the first continuous slope,
  • the sealing plug assembly blocks the opening of the pressure cylinder and the sealing ring is pushed by the high-pressure liquid in the pressure cylinder, the sealing ring will be guided by the first continuous slope and move relatively away from the central axis of the plug body. In this way, the sealing ring will be guided by the guide ring to expand outward and be closer to the wall surface surrounding the opening of the pressure cylinder, thereby achieving the effect of sealing the pressure cylinder.
  • the sealing plug assembly can be easily taken out from the opening of the pressure cylinder.
  • Figure 1 is a schematic plan view of a sealing plug assembly and a pressure cylinder according to an embodiment of the present invention
  • Figure 2 is a perspective schematic view of the sealing plug assembly in Figure 1;
  • Figure 3 is an exploded schematic diagram of Figure 2;
  • Figure 4 is a schematic cross-sectional view of Figure 1;
  • Fig. 5 is a schematic partial enlarged cross-sectional view of Fig. 4;
  • Figure 6 is a partially enlarged schematic cross-sectional view of the seal ring in Figure 5 being pushed by high-pressure liquid;
  • Fig. 7 is a schematic partial enlarged cross-sectional view of the sealing plug assembly of the second embodiment of the present invention.
  • Fig. 8 is a partial enlarged cross-sectional view of the sealing plug assembly of the third embodiment of the present invention.
  • FIG. 1 is a schematic plan view of a sealing plug assembly and a pressure cylinder according to an embodiment of the present invention
  • FIG. 2 is a perspective schematic view of the sealing plug assembly in FIG. 1.
  • This embodiment discloses a sealing plug assembly 1a.
  • the sealing plug assembly 1a is used to seal an opening 3 of a pressure cylinder 2.
  • This pressure cylinder 2 is, for example, a device for high-pressure processing of food.
  • FIG. 3 is an exploded schematic diagram of Fig. 2.
  • Fig. 4 is a schematic cross-sectional view of Fig. 1.
  • Fig. 5 is a schematic partial enlarged cross-sectional view of Fig. 4.
  • the sealing plug assembly 1a includes a plug body 10a, a guide ring 20a, a sealing ring 30a, a leak-proof ring 40a, and an elastic reset member 50a.
  • the plug body 10a has an annular outer wall surface 14a, a first annular assembly groove 15a and a groove bottom surface 16a.
  • the annular outer wall surface 14a faces away from and surrounds the central axis P of the plug body 10a.
  • the annular outer wall surface 14a has a plug side edge 141a and an exposed side edge 142a opposite to each other on the central axis P of the plug body 10a.
  • the first annular assembly groove 15a is interposed between the inserted side edge 141a and the exposed side edge 142a.
  • the sealing plug assembly 1 a seals the opening 3 of the pressure cylinder 2
  • the inserted side edge 141 a and the first annular assembly groove 15 a are located in the pressure cylinder 2
  • the exposed side edge 142 a is located outside the pressure cylinder 2.
  • the groove bottom surface 16a is located on one side of the first annular assembly groove 15a, and the normal line N of the groove bottom surface 16a is, for example, orthogonal to the central axis P of the plug body 10a.
  • the plug body 10a includes a body portion 11a and a cover portion 12a.
  • the cover portion 12a is detachably mounted on the body portion 11a along the central axis P of the plug body 10a, and forms a first annular assembly groove 15a together with the body portion 11a.
  • the guide ring 20a and the sealing ring 30a can be installed or separated in the first annular assembly groove 15a.
  • the guide ring 20a is sleeved on the plug body 10a and is located in the first annular assembly groove 15a.
  • the guide ring 20a has a first continuous slope 21a.
  • the first continuous slope 21a is, for example, a smooth slope, and the first continuous slope 21a has a first side 211a and a second side 212a opposite to each other.
  • the first side 211a is closer to the exposed side edge 142a than the second side 212a, and the distance D1 from the first side 211a to the central axis P of the plug body 10a is greater than the distance D2 from the second side 212a to the central axis P of the plug body 10a.
  • the sealing ring 30a is sleeved on the plug body 10a and located in the first annular assembly groove 15a, and the sealing ring 30a is farther away from the exposed side edge 142a than the guide ring 20a.
  • the sealing ring 30a has an inner surface 31a, an outer surface 32a, a side surface 33a, a second continuous inclined surface 34a, an arc surface 35a, a second annular assembly groove 36a, a first groove side surface 361a, and a second groove Side 362a and a plurality of annular grooves 37a.
  • the inner surface 31a of the sealing ring 30a faces the groove bottom surface 16a, and the length L1 of the inner surface 31a on the central axis P of the plug body 10a is, for example, 12 mm.
  • the outer surface 32a faces away from the inner surface 31a, and the outer surface 32a is, for example, parallel to the inner surface 31a.
  • the side surface 33a and the second continuous slope 34a are located between the inner surface 31a and the outer surface 32a.
  • the side surface 33a and the second continuous slope 34a are connected to two opposite sides of the inner surface 31a, and the side surface 33a is, for example, perpendicular to the inner surface 31a.
  • the ratio of the length L2 of the side surface 33a in the direction perpendicular to the central axis P of the plug body 10a to the distance D3 between the outer surface 32a and the inner surface 31a in the direction perpendicular to the central axis P of the plug body 10a For example, between 5/18 and 12/18.
  • the length L2 of the side surface 33a in the direction perpendicular to the central axis P of the plug body 10a is 8 mm
  • the distance D3 between the outer surface 32a and the inner surface 31a in the direction perpendicular to the central axis P of the plug body 10a Is 18 mm.
  • Two opposite sides of the circular arc surface 35a engage the outer surface 31a and the second continuous inclined surface 34a away from the inner surface 31a.
  • one of the edges of the sealing ring 30a is rounded.
  • the second continuous slope 34a of the sealing ring 30a is matched with the first continuous slope 21a of the guide ring 20a, and the included angle ⁇ between the second continuous slope 34a and the groove bottom surface 16a is, for example, between 30 degrees and 60 Between degrees.
  • the angle between the second continuous inclined surface 34a and the groove bottom surface 16a is 45 degrees as an example.
  • first groove side surface 361a and one side of the second groove side surface 362a are connected.
  • An end of the first groove side surface 361a away from the second groove side surface 362a is connected to the outer surface 32, and the normal line of the first groove side surface 361a is parallel to the central axis P of the plug body 10, for example.
  • An end of the second groove side surface 362a away from the first groove side surface 361a is connected to the side surface 33a, and the normal line of the second groove side surface 362a is, for example, perpendicular to the central axis P of the plug body 10.
  • the first groove side surface 361a and the second groove side surface 362a jointly form a second annular assembly groove 36a, and two adjacent sides of the second annular assembly groove 36a are respectively connected to the outer surface 31a and the side surface 33a.
  • a first connection line C1 is formed at the junction of the first groove side surface 361a and the second groove side surface 362a
  • a second connection line C2 is formed at the junction of the inner surface 31a and the second continuous slope 34a.
  • the first connecting line C1 and the second connecting line C2 are both located on the same plane S perpendicular to the central axis P of the plug body 10a.
  • the annular grooves 37a are recessed from the inner surface 31a, and the annular grooves 37a are arranged along the direction of the inserted side edge 141a toward the exposed side edge 142a.
  • the anti-leak ring 40a is arranged in the annular groove 37a closest to the exposed side edge 142a among the annular grooves 37a, and the elastic reset member 50a is arranged in the second annular assembly groove 36a.
  • the elastic reset member 50a has a groove 51a on the side away from the guide ring 20a.
  • FIG. 6 is a partial enlarged cross-sectional view of the seal ring in FIG. 4 being pushed by the high-pressure liquid.
  • the high-pressure liquid (for example, water) in the pressure cylinder 2 will enter the elastic return member 50a from the gap between the elastic reset member 50a and the cover portion 12a.
  • the groove 51a and the annular groove 37a of the seal ring 30a will push the sealing ring 30a and the elastic return member 50a, so that the sealing ring 30a is guided by the first continuous slope 21a and moves relatively away from the central axis P of the plug body 10a (as shown in FIG. 4).
  • the sealing ring 30a will be guided by the guide ring 20a to expand outward and be closer to a wall 4 surrounding the opening 3 of the pressure cylinder 2 to achieve the effect of sealing the pressure cylinder 2.
  • the anti-leak ring 40a is disposed in the annular groove 37a closest to the exposed side edge 142a (as shown in Figure 2), the high-pressure liquid can only enter the other annular grooves closer to the inserted side edge 141a.
  • the groove 37a does not enter the side of the anti-leak ring 40a adjacent to the exposed side edge 142a to maintain the sealing pressure cylinder 2.
  • the position of the anti-leak ring 40a of this embodiment is not limited to the annular groove 37a disposed closest to the exposed side edge 142a.
  • an anti-leak ring may be provided in an annular groove in the middle of these annular grooves.
  • annular grooves 37a to allow high-pressure liquid to enter allows the high-pressure liquid to exert force on the sealing ring 30a in the direction perpendicular to the central axis P of the plug body 10a, and the overall sealing ring 30a is more evenly stressed, thus sealing The ring 30a slides linearly along the direction d1 while being guided by the first continuous inclined surface 21a.
  • the sealing ring 30a is not about the central axis P of the plug body 10a to rotate and slide relative to the guide ring 20a in the direction d2 (as shown in FIG. 4), so the degree of wear between the sealing ring 30a and the guide ring 20a can be reduced. , And extend the service life of the sealing ring 30a and the guide ring 20a.
  • the rounded corners of the sealing ring 30a can reduce the stress generated by the sealing ring 30a pressing against the wall surface 4 of the pressure cylinder 2, thereby reducing the probability of damage to the edge of the sealing ring 30a, thereby achieving lengthening The effect of the service life of the seal ring 30a.
  • the elastic resetting member 50a Since the elastic resetting member 50a is deformed when pushed by the high-pressure liquid, after the pressure in the pressure cylinder 2 is released, the elastic resetting member 50a will return to its original shape and drive the sealing ring 30a along the first continuous slope 21a Move to the position shown in FIG. 5, so that the sealing ring 30a is not in a state close to the wall surface 4, so the sealing plug assembly 1a can be taken out from the opening 3 of the pressure cylinder 2 more easily.
  • the elastic reset member 50a has the groove 51a, which is not used to limit the present invention. In other embodiments, the elastic return member may be free of grooves.
  • first connecting line C1 and the second connecting line C2 are both located on the same plane S perpendicular to the central axis P of the plug body 10a, and the length L2 of the side surface 33a in the direction perpendicular to the central axis P of the plug body 10a
  • the ratio of the distance D3 between the outer surface 32a and the inner surface 31a in the direction perpendicular to the central axis P of the plug body 10a is, for example, between 5/18 and 12/18, which can lift the sealing ring 30a to be guided
  • the guiding effect of the ring 20a makes it easier for the sealing ring 30a to expand outward and return to its original position, thereby further improving the effect of sealing the pressure cylinder 2 and making it easier to take out the sealing plug assembly 1a from the opening 3 of the pressure cylinder 2.
  • the number of annular grooves 37a of the sealing ring 30a is multiple, which is not used to limit the present invention.
  • the sealing plug assembly of other embodiments will be described below.
  • the sealing plug assembly of the following embodiments is similar to the sealing plug assembly 1a shown in FIG. 5.
  • the main difference between the sealing plug assembly and the sealing plug assembly of each embodiment lies in the annular recess.
  • the number of slots is different.
  • FIG. 7 is a partial enlarged cross-sectional view of the sealing plug assembly of the second embodiment of the present invention.
  • the number of annular grooves 37b of the sealing ring 30b is one
  • the depth T of the annular groove 37b on the central axis P (as shown in FIG. 4) of the plug body 10b is, for example, 5 mm
  • the width W of the annular groove 37b in the direction perpendicular to the central axis P of the plug body 10b is, for example, 2 mm.
  • FIG. 8 is a partial enlarged cross-sectional view of the sealing plug assembly of the third embodiment of the present invention.
  • the sealing ring 30c does not have any annular groove.
  • the sealing plug assembly of the above embodiment since the first side of the first continuous slope of the guide ring is farther from the central axis of the plug body than the second side, and the sealing ring has a second continuous slope that matches the first continuous slope,
  • the sealing plug assembly blocks the opening of the pressure cylinder and the sealing ring is pushed by the high-pressure liquid in the pressure cylinder, the sealing ring will be guided by the first continuous slope and move relatively away from the central axis of the plug body. In this way, the sealing ring will be guided by the guide ring to expand outward and be closer to the wall surface surrounding the opening of the pressure cylinder, thereby achieving the effect of sealing the pressure cylinder.
  • the setting of the annular groove to allow high-pressure liquid to enter allows the high-pressure liquid to exert force on the sealing ring in the direction perpendicular to the center axis of the plug body, and the overall sealing ring is more evenly stressed. Therefore, the sealing ring is subjected to the first continuous force.
  • the linear sliding is not related to the sliding movement of the guide member relative to the center axis of the plug body, so it can reduce the degree of wear of the sealing ring and the guide ring, and prolong the service life of the sealing ring and the guide ring .
  • the rounded corners of the seal ring can reduce the stress generated by the seal ring pressing against the wall surface of the pressure cylinder, thereby reducing the probability of damage to the edge of the seal ring and extending the service life of the seal ring Effect.
  • the elastic return piece After the pressure in the pressure cylinder is released, the elastic return piece will return to its original shape, and drive the sealing ring to move back to its original position along the first continuous slope, so that the sealing ring is not in a state of close contact with the wall, so the sealing The plug assembly can be easily taken out from the opening of the pressure cylinder.
  • the arrangement of the grooves of the elastic reset member to allow high-pressure liquid to enter can make the deformation degree of the elastic reset member more obvious and store more resilience. Therefore, after the pressure in the pressure cylinder is released, the elastic reset member can provide greater The acting force of the seal ring, and the effect of resetting the seal ring is better.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

Un ensemble bouchon d'étanchéité comprend un corps de bouchon (10a, 10b), une bague de guidage (20a), une bague d'étanchéité (30a, 30b, 30c) et un élément de rappel élastique (50a). Le corps de bouchon (10a, 10b) présente une surface de paroi externe annulaire (14a) et une première rainure d'ajustement annulaire (15a). La surface de paroi externe annulaire (14a) a un bord latéral d'obturation et un bord latéral exposé opposé. La première rainure d'ajustement annulaire (15a) est située au niveau de la surface de paroi externe annulaire (14a) entre le bord latéral d'obturation et le bord latéral exposé. La bague de guidage (20a) est emmanchée sur le corps de bouchon (10a, 10b) et située au niveau de la première rainure d'ajustement annulaire (15a). La bague de guidage (20a) est emmanchée sur le corps de bouchon (10a, 10b) et située au niveau de la première rainure d'ajustement annulaire (15a). Le premier côté est plus proche du bord latéral exposé que le second côté, et le premier côté est plus éloigné d'un axe central du corps de bouchon que le second côté. La bague d'étanchéité (30a, 30b, 30c) est emmanchée sur le corps de bouchon (10a, 10b) et située au niveau de la première rainure d'ajustement annulaire (15a). La bague d'étanchéité (30a, 30b, 30c) a une seconde surface inclinée continue correspondant à la première surface inclinée continue. L'élément de rappel élastique (50a) est emmanché au niveau de la bague d'étanchéité.
PCT/CN2019/078581 2019-03-19 2019-03-19 Ensemble bouchon d'étanchéité Ceased WO2020186431A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/078581 WO2020186431A1 (fr) 2019-03-19 2019-03-19 Ensemble bouchon d'étanchéité

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Application Number Priority Date Filing Date Title
PCT/CN2019/078581 WO2020186431A1 (fr) 2019-03-19 2019-03-19 Ensemble bouchon d'étanchéité

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WO2020186431A1 true WO2020186431A1 (fr) 2020-09-24

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1133693A (zh) * 1996-02-16 1996-10-23 中国兵器工业第五二研究所 食品高压灭菌方法及其装置
WO2003090566A1 (fr) * 2002-04-23 2003-11-06 N.C. Amahe, S.A. Machine et procede de traitement de produits liquides sous haute pression
CN201319840Y (zh) * 2008-12-11 2009-10-07 熙可国际贸易（上海浦东新区）有限公司 用于高压灭菌装置的密封机构
CN101790420A (zh) * 2007-08-31 2010-07-28 美国圣戈班性能塑料公司 隔膜
CN201621261U (zh) * 2010-04-13 2010-11-03 中国农业大学 一种超高压容器直推式密封堵头
US20120304872A1 (en) * 2010-02-01 2012-12-06 Avure Technologies Ab High-pressure arrangement with locking element preventing rotation of load basket
CN105942132A (zh) * 2016-05-06 2016-09-21 北京速原中天科技股份公司 一种超高压设备的堵头的密封结构

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1133693A (zh) * 1996-02-16 1996-10-23 中国兵器工业第五二研究所 食品高压灭菌方法及其装置
WO2003090566A1 (fr) * 2002-04-23 2003-11-06 N.C. Amahe, S.A. Machine et procede de traitement de produits liquides sous haute pression
CN101790420A (zh) * 2007-08-31 2010-07-28 美国圣戈班性能塑料公司 隔膜
CN201319840Y (zh) * 2008-12-11 2009-10-07 熙可国际贸易（上海浦东新区）有限公司 用于高压灭菌装置的密封机构
US20120304872A1 (en) * 2010-02-01 2012-12-06 Avure Technologies Ab High-pressure arrangement with locking element preventing rotation of load basket
CN201621261U (zh) * 2010-04-13 2010-11-03 中国农业大学 一种超高压容器直推式密封堵头
CN105942132A (zh) * 2016-05-06 2016-09-21 北京速原中天科技股份公司 一种超高压设备的堵头的密封结构

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