CN113551055A

CN113551055A - Ultra-low temperature integrated ball valve

Info

Publication number: CN113551055A
Application number: CN202110849017.4A
Authority: CN
Inventors: 王少华; 张铭; 金文斌; 张朝敏
Original assignee: Kairuite Valve Co ltd
Current assignee: Kairuite Valve Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-10-26
Anticipated expiration: 2041-07-27
Also published as: CN113551055B

Abstract

The invention discloses an ultralow-temperature integrated ball valve which comprises a pneumatic actuator, wherein the pneumatic actuator is fixedly connected with a heat-insulating pipe through a support frame arranged at the bottom of the pneumatic actuator, the bottom of the heat-insulating pipe is connected with a valve body through a plurality of groups of bolt threads, the valve body comprises a shell, two sides of the shell are both connected with shell covers through a plurality of groups of bolt threads, a ball body is arranged in the shell, the top of the ball body is fixedly connected with the inside of the pneumatic actuator through a valve rod, and the heat-insulating pipe is sleeved on the outer side of the valve rod. This ultra-low temperature integral type ball valve can solve prior art effectively, and the ultra-low temperature valve is as the key equipment of LNG project, but between the disk seat of current ultra-low temperature ball valve and the valve gap, generally with rubber O type circle or graphite packing between gland and the valve rod sealed, elasticity sealing element graphite mainly used high low temperature, but through not starting the switch, does not stop the switch and leads to the fact the problem of leaking easily.

Description

Ultra-low temperature integrated ball valve

Technical Field

The invention relates to the technical field of ball valves, in particular to an ultralow-temperature integrated ball valve.

Background

The ultralow temperature valve refers to a valve below-101 ℃ (excluding-101 ℃), is usually made of low alloy steel with good low temperature performance, and has special requirements on structural design and process. If a structure for preventing the liquid stored in the body cavity from being gasified and generating abnormal pressure rise is arranged, a 'long neck' structure, a vacuum jacket and the like are adopted to reduce the cold loss. The valve is used for the production devices of liquefaction separation of petroleum products, petroleum gas and natural gas, liquid oxygen and the like.

At some LNG mills, the receiving station, the transportation, in the rapid development processes such as vaporizing station, the ultra-low temperature valve is as the key equipment of LNG project, but between the disk seat of current ultra-low temperature ball valve and the valve gap, generally with rubber O type circle or graphite packing seal between gland and the valve rod, elasticity sealing element graphite mainly used high low temperature, but through not starting the switch, incessantly the switch causes the leakage easily, and in the use, the ultra-low temperature valve is to the velocity of flow of liquid, can't carry out fine control, in the debugging process, can't satisfy the experiment of different velocity of flow.

Disclosure of Invention

Solves the technical problem

Aiming at the defects in the prior art, the invention provides an ultralow-temperature integrated ball valve which can effectively solve the problem that in the prior art, an ultralow-temperature valve is used as key equipment of an LNG project, but between a valve seat and a valve cover of the existing ultralow-temperature ball valve, a packing gland and a valve rod are generally sealed by using rubber O-shaped rings or graphite packing, and an elastic sealing element, namely graphite, is mainly used for high and low temperatures, but is easy to leak due to the fact that the valve cannot be opened or closed without stopping.

Technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention provides an ultralow-temperature integrated ball valve which comprises a pneumatic actuator, wherein the pneumatic actuator is fixedly connected with a heat-insulating pipe through a support frame arranged at the bottom of the pneumatic actuator, and the bottom of the heat-insulating pipe is connected with a valve body through a plurality of groups of bolt threads;

the valve body comprises a shell, wherein the two sides of the shell are both connected with shell covers through a plurality of groups of bolt threads, a ball body is arranged in the shell, and the top of the ball body is fixedly connected with the inside of the pneumatic actuator through a valve rod.

Further, the heat preservation pipe is sleeved on the outer side of the valve rod, and the bottom end of the valve rod penetrates through the shell and is rotatably connected with the shell.

Furthermore, a limiting ring is arranged on the outer side of the valve rod, and the limiting ring is matched with a groove formed in the shell.

Further, the upper side and the lower side of the ball body are provided with bearing plates, the bearing plates are sleeved on the outer side of the valve rod, and sealing elements are arranged on the left side and the right side of the ball body.

Furthermore, the bearing plate is trapezoidal, two side edges of the trapezoid are arc-shaped, an arc-shaped groove is formed in the shell, and the outer side of the bearing plate is matched with the arc-shaped groove.

Furthermore, the two sides of the bearing plate are fixedly connected with bearing rods, and one side of each bearing rod, which is far away from the bearing plate, is tightly attached to the inside of the shell cover through a rubber block.

Furthermore, the sealing element comprises an annular block, sealing strips are detachably mounted in the annular block through annular grooves formed in the surface of the annular block, and the outer edge of the annular block is fixedly connected with the inside of the shell cover through a plurality of groups of spring groups.

Furthermore, one side of the annular block is fixedly connected with a sealing ring piece, the sealing ring piece is made of tetrafluoroethylene, the sealing ring piece is designed into an inward-concave integrated arc piece, and the inner side surface of the arc piece is matched with the outer surface of the ball body.

Further, the spheroid includes the outer ball of revolving, the opening has been seted up in the outer ball of revolving, the opening top can be dismantled and be connected with spacing closing plate, spacing closing plate's top with accept the sealed laminating in board top, the outer ball of revolving is connected through setting up in its outside valve rod and casing internal rotation.

Further, be provided with interior ball of revolving in the opening, interior ball of revolving is connected through setting up the interior valve rod in its outside and casing rotation, interior valve rod top run through in proper order accept board and valve rod and with extend to pneumatic actuator in, interior ball of revolving has seted up interior discharge orifice in, the restriction orifice of variation in size is seted up to interior ball of revolving outside equidistant in proper order.

Advantageous effects

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

the invention adopts the trapezoidal design of the bearing plate in the valve body, the two side edges of the trapezoid are both arc-shaped, the arc-shaped groove arranged in the shell is matched with the outer side of the bearing plate, the ball body is convenient to be directly installed from the inside, the bearing plate is mutually clamped with the arc-shaped groove, the invention has good explosion-proof function, meanwhile, when the ball body integrally rotates, the bearing rods at the two ends of the bearing plate are tightly pressed in the shell cover through the rubber blocks to prevent the ball body from deviating and forming leakage, the regulator drives the valve rod to rotate through the bearing to drive the valve body to rotate, the sealing pieces at the two sides of the valve body are mutually extruded, the multiple groups of spring groups are inwards compressed to enable the sealing ring pieces to be tightly attached to the outer surface of the ball body, the sealing strips on the sealing pieces have good sealing effect, when the sealing ring pieces are mutually extruded with the outer surface of the ball body, the sealing ring pieces are made of tetrafluoroethylene, and are designed as inward-sunken arc pieces, compare with sealing strip commonly used, the whole annular design of seal ring piece, increase with the area of contact of spheroid surface, elastic deformation can take place for seal ring piece pressurized, makes more inseparabler of seal ring piece and the laminating of spheroid surface, and when the spheroid rotated, the unsmooth deformation of seal ring piece made and laminated all the time between seal ring piece and the sphere, reduced liquefied natural gas's gasification, improved the life of ultra-low temperature integral type ball valve.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of a partial cross-section of the present invention;

FIG. 3 is a schematic structural view of a three-dimensional layered partial cross-section according to the present invention;

FIG. 4 is a schematic three-dimensional layered structure of the seal of the present invention;

FIG. 5 is a schematic structural view of a three-dimensional partial section of the valve body of the present invention;

FIG. 6 is a schematic structural view of a three-dimensional layered partial section of the valve body according to the present invention;

FIG. 7 is a perspective structural view of a sphere according to the present invention;

FIG. 8 is a schematic view of a multi-angle structure of a sphere of the present invention.

The reference numerals in the drawings denote: 1-a pneumatic actuator; 2-a support frame; 3-a heat preservation pipe; 4-a valve body; 41-a housing; 42-a shell cover; 43-sphere; 431-outward spin ball; 432-flow-through pores; 433-a limit sealing plate; 434-internal rotation ball; 435-inner valve stem; 436-inner flow orifice; 437-flow restriction orifice; 44-a valve stem; 45-a limit ring; 46-a bearing plate; 461-bolster; 47-a seal; 471-ring block; 472-sealing strip; 473-spring set; 474-sealing ring piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Example (b):

referring to fig. 1-8, the present invention provides a technical solution: an ultralow-temperature integrated ball valve comprises a pneumatic actuator 1, wherein the pneumatic actuator 1 is fixedly connected with a heat-insulating pipe 3 through a support frame 2 arranged at the bottom of the pneumatic actuator 1, and the bottom of the heat-insulating pipe 3 is connected with a valve body 4 through a plurality of groups of bolt threads;

the valve body 4 includes a housing 41, both sides of the housing 41 are connected to a housing cover 42 through a plurality of sets of bolt threads, a ball 43 is arranged in the housing 41, and the top of the ball 43 is fixedly connected to the pneumatic actuator 1 through a valve rod 44.

The insulating tube 3 is sleeved on the outer side of the valve rod 44, and the bottom end of the valve rod 44 penetrates through the shell 41 and is rotatably connected with the shell 41.

A limiting ring 45 is arranged on the outer side of the valve rod 44, and the limiting ring 45 is matched with a groove formed in the shell 41.

The upper and lower sides of the ball 43 are provided with receiving plates 46, the receiving plates 46 are sleeved outside the valve rod 44, and the left and right sides of the ball 43 are provided with sealing elements 47.

The bearing plate 46 is designed to be trapezoidal, two side edges of the trapezoid are designed to be arc-shaped, an arc-shaped groove 47 is formed in the shell 41, the outer side of the bearing plate 46 is matched with the inner side of the arc-shaped groove 47, the ball body 43 can be conveniently and directly installed from the inside, and the explosion-proof effect is good.

The two sides of the receiving plate 46 are fixedly connected with the receiving rods 461, one side of the receiving rods 461, which is far away from the receiving plate 46, is tightly attached to the inside of the housing cover 42 through the rubber blocks, and the receiving rods 461 at the two ends of the receiving plate 46 are tightly pressed in the housing cover 42 through the rubber blocks, so that the ball 43 is prevented from shifting and leaking.

The sealing element 47 comprises a ring-shaped block 471, a sealing strip 472 is detachably mounted in the ring-shaped block 471 through an annular groove formed in the surface of the ring-shaped block 471, the sealing effect is good, and the outer edge of the ring-shaped block 471 is fixedly connected with the inside of the shell cover 42 through a plurality of groups of spring groups 473.

Annular piece 471 one side fixedly connected with seal ring piece 474, seal ring piece 474's material is tetrafluoroethylene, seal ring piece 474 designs to be inside sunken integral type arc piece, the whole annular design of seal ring piece 474, increase with the area of contact of spheroid 43 surface, and arc piece medial surface and spheroid 43 surface looks adaptation, when spheroid 43 rotates, seal ring piece 474's unsmooth deformation makes and laminates all the time between seal ring piece 474 and the sphere, reduce liquefied natural gas's gasification, improve the life of ultra-low temperature integral type ball valve.

The ball body 43 comprises an outward turning ball 431, a flow hole 432 is formed in the outward turning ball 431, the top of the flow hole 432 is detachably connected with a limiting sealing plate 433, the top of the limiting sealing plate 433 is in sealing fit with the top of the bearing plate 46, and the outward turning ball 431 is rotatably connected with the shell 41 through a valve rod 44 arranged on the outer side of the outward turning ball 431.

The inner rotary ball 434 is arranged in the flow hole 432, the flow of the inner rotary ball 434 is automatically adjusted, the use rotating frequency of the outer rotary ball 431 is reduced, the abrasion of a sealing ring piece 474 on the sealing element 47 is reduced, the service life of the sealing element 47 is prolonged, the inner rotary ball 434 is rotatably connected with the shell 41 through an inner valve rod 435 arranged on the outer side of the inner rotary ball 434, the top end of the inner valve rod 435 sequentially penetrates through the bearing plate 46 and the valve rod 44 and extends into the pneumatic actuator 1, an inner flow hole 436 is formed in the inner rotary ball 434, when the flow is large, the inner flow hole 436 formed in the inner rotary ball 434 is communicated with the inner flow hole 436 in the outer rotary ball 431, liquefied natural gas is used for fast flowing, flow limiting holes 437 with different sizes are sequentially formed in the outer side of the inner rotary ball 434 at equal intervals, when the flow is small, the flow limiting hole 437 is communicated with the inner flow hole 436 in the outer rotary ball 431, the required flow rate is adjusted, and the adaptation with different flow rates is met.

When the ultra-low temperature integrated ball valve is used, a pipeline is communicated with an ultra-low temperature integrated ball valve body, liquefied natural gas is guided into the left end of a valve body 4 through the pipeline, at the moment, an electric-air valve positioner is adopted by the ultra-low temperature integrated ball valve, electric signals and compressed air are taken as power, 0-10mA DC or 4-20mA DC current signals input by a control system are received, the compressed air is converted into air source pressure signals by a regulator and is input and output, the rotating angle of a ball core is changed, an external pneumatic actuator 1 adopts a piston type cylinder and crank arm conversion structure, a valve rod 44 is preferentially driven to rotate through a ball valve transmission bearing to drive a ball body 43 to integrally rotate, the left end and the right end inside the valve body 4 are communicated, the regulator drives the valve rod 44 to rotate through a bearing to drive the valve body 4 to rotate, sealing pieces 47 on two sides of the valve body 4 are mutually extruded, and a plurality of groups of spring groups 473 are inwards compressed, the sealing ring piece 474 is tightly attached to the outer surface of the ball body 43;

referring to fig. 1-5, the receiving plate 46 in the valve body 4 is designed in a trapezoid shape, two sides of the trapezoid are arc-shaped, the arc-shaped groove 47 formed in the housing 41 is matched with the outer side of the receiving plate 46, so that the ball 43 can be directly mounted from the inside, the receiving plate 46 is engaged with the arc-shaped groove 47, so as to have a good explosion-proof effect, meanwhile, when the ball 43 rotates integrally, the receiving rods 461 at two ends of the receiving plate 46 are tightly pressed in the housing cover 42 through the rubber block, so as to prevent the ball 43 from shifting and causing leakage, the regulator drives the valve rod 44 to rotate through the bearing, so as to drive the valve body 4 to rotate, the sealing elements 47 at two sides of the valve body 4 are pressed against each other, the plurality of spring sets 473 are compressed inward, so that the sealing ring 474 is tightly attached to the outer surface of the ball 43, the sealing strip 472 on the sealing element 47 has a good sealing effect, when the sealing ring 474 and the outer surface of the ball 43 are pressed against each other, the sealing ring 474 is made of tetrafluoroethylene, the sealing ring piece 474 is designed into an inward-concave integrated arc piece, compared with a common sealing strip, the sealing ring piece 474 is designed into an integrated annular shape, the contact area between the sealing ring piece 474 and the outer surface of the ball body 43 is increased, the sealing ring piece 474 can elastically deform under pressure, so that the sealing ring piece 474 is tightly attached to the outer surface of the ball body 43, and when the ball body 43 rotates, the concave-convex deformation of the sealing ring piece 474 enables the sealing ring piece 474 to be always attached to the ball surface, thereby reducing the gasification of liquefied natural gas and prolonging the service life of the ultralow-temperature integrated ball valve;

in the using process, when the flow rate of the ultralow temperature valve liquid needs to be adjusted, the electromagnetic directional valve and the valve position transponder are adopted, AC220V or DC24V power voltage and compressed air are used as power, the rapid two-position replacement control of the fluid medium is realized, the bearing drives the inner valve rod 435 to rotate, and the inner rotary ball 434 is driven to rotate in the outer rotary ball 431;

referring to fig. 6-8, the rotation of the inner valve rod 435 is controlled by the electromagnetic directional valve and the valve position transponder to change the angle of the inner rotary ball 434 in the outer rotary ball 431, when a large flow is required, the inner rotary ball 434 is internally provided with an inner flow hole 436 communicated with the inner flow hole 436 in the outer rotary ball 431, and liquefied natural gas is used for fast flowing, when a small flow is required, the outer side of the inner rotary ball 434 is sequentially provided with flow limiting holes 437 with different sizes at equal intervals, so that the flow limiting holes 437 are communicated with the inner flow hole 436 in the outer rotary ball 431 to adjust to a required flow rate, thereby meeting adaptation with different flows, having high universality and meeting use requirements, and simultaneously, the flow of the inner rotary ball 434 is automatically adjusted, so that the use rotation frequency of the outer rotary ball 431 is reduced, the abrasion of a sealing ring 474 on the sealing element 47 is reduced, and the service life of the sealing element 47 is prolonged.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an ultra-low temperature integral type ball valve which characterized in that: the pneumatic actuator comprises a pneumatic actuator (1), wherein the pneumatic actuator (1) is fixedly connected with a heat-insulating pipe (3) through a support frame (2) arranged at the bottom of the pneumatic actuator, and the bottom of the heat-insulating pipe (3) is connected with a valve body (4) through a plurality of groups of bolt threads;

the pneumatic actuator is characterized in that the valve body (4) comprises a shell (41), both sides of the shell (41) are connected with a shell cover (42) through a plurality of groups of bolt threads, a ball body (43) is arranged in the shell (41), and the top of the ball body (43) is fixedly connected with the inside of the pneumatic actuator (1) through a valve rod (44).

2. An ultra-low temperature integrated ball valve according to claim 1, wherein: the heat preservation pipe (3) is sleeved on the outer side of the valve rod (44), and the bottom end of the valve rod (44) penetrates through the shell (41) and is rotatably connected with the shell (41).

3. An ultra-low temperature integrated ball valve according to claim 1, wherein: a limiting ring (45) is arranged on the outer side of the valve rod (44), and the limiting ring (45) is matched with a groove formed in the shell (41).

4. An ultra-low temperature integrated ball valve according to claim 1, wherein: bearing plates (46) are arranged on the upper side and the lower side of the ball body (43), the outer sides of the valve rods (44) are sleeved with the bearing plates (46), and sealing pieces (47) are arranged on the left side and the right side of the ball body (43).

5. An ultra-low temperature integrated ball valve according to claim 4, wherein: the bearing plate (46) is trapezoidal, the two sides of the trapezoid are arc-shaped, an arc-shaped groove (47) is formed in the shell (41), and the outer side of the bearing plate (46) is matched with the arc-shaped groove (47).

6. An ultra-low temperature integrated ball valve according to claim 4, wherein: the two sides of the bearing plate (46) are fixedly connected with bearing rods (461), and one side, far away from the bearing plate (46), of each bearing rod (461) is tightly attached to the inside of the shell cover (42) through a rubber block.

7. An ultra-low temperature integrated ball valve according to claim 4, wherein: the sealing element (47) comprises a ring-shaped block (471), a sealing strip (472) is detachably mounted in the ring-shaped block (471) through a ring-shaped groove formed in the surface of the ring-shaped block, and the outer edge of the ring-shaped block (471) is fixedly connected with the inside of the shell cover (42) through a plurality of groups of spring groups (473).

8. An ultra-low temperature integrated ball valve according to claim 7, wherein: one side of the annular block (471) is fixedly connected with a sealing ring piece (474), the sealing ring piece (474) is made of tetrafluoroethylene, the sealing ring piece (474) is designed into an inward-concave integrated arc piece, and the inner side surface of the arc piece is matched with the outer surface of the sphere (43).

9. An ultra-low temperature integrated ball valve according to claim 1, wherein: the ball body (43) comprises an outward turning ball (431), a circulation hole (432) is formed in the outward turning ball (431), a limiting sealing plate (433) is detachably connected to the top of the circulation hole (432), the top of the limiting sealing plate (433) is attached to the top of the bearing plate (46) in a sealing mode, and the outward turning ball (431) is connected with the shell (41) in a rotating mode through a valve rod (44) arranged on the outer side of the outward turning ball.

10. An ultra-low temperature integrated ball valve according to claim 9, wherein: interior spiral ball (434) is provided with in circulation hole (432), interior spiral ball (434) is through setting up in its outside interior valve stem (435) and casing (41) internal rotation connection, interior valve stem (435) top run through in proper order and accept board (46) and valve rod (44) and with extend to pneumatic actuator (1), interior discharge orifice (436) have been seted up in interior spiral ball (434), interior spiral ball (434) outside is equidistant restriction orifice (437) of seting up the variation in size in proper order.