CN2615454Y

CN2615454Y - Vacuum ball valve

Info

Publication number: CN2615454Y
Application number: CN 03230042
Authority: CN
Inventors: 费海鸿
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-04
Filing date: 2003-04-04
Publication date: 2004-05-12
Anticipated expiration: 2013-04-04

Abstract

The utility model discloses a vacuum ball valve, comprising a valve body, a sphere, a valve rod and two end caps, the sphere is arranged in the container cavity of the valve body, two end caps are separately positioned on two sides of the valve body, the upper end of the valve rod is square extension, the lower end is flat potential, the valve rod is vertically plugged into the valve body, the top of the sphere is provided with a crescent groove for the flat potential of the valve rod lower end plugging into, the portion of the valve rod arranged in the container cavity of the valve body is sleeved with a gasket and an O shape packing ring, a sealing member is positioned between the sphere arranged in the container cavity of the valve body and the end caps, the contact of the sealing member and the sphere surface is opened with a swallow-tail form seal groove, an O shape packing ring is positioned in the seal groove, between the spherical surface of the ball valve and the end caps and between the valve rod and the valve body are more sealed, improving the sealing property and the vacuum degree via increasing the packing force to the sealing member is needless, the required rotary torque of the ball valve is small, which is easy to drive and has a long service life.

Description

Vacuum ball valve

Technical field

The utility model relates to valve, more specifically refers to the demanding Vacuum ball valve of a kind of degree of vacuum.

Background technique

Vacuum ball valve be in vacuum equipment, vacuum engineering, use more a kind of valve, it is simple in structure, the admittance ability is big, operation and maintenance is convenient.Receive praises from customers.

The traditional vacuum ball valve, actual is a kind of pressure ball valve, the pressure ball valve is used as Vacuum ball valve uses.This pressure ball valve is in vacuum system, and pressure is had a surplus, the vacuum deficiency, and gas leakage easily, the user is dissatisfied, also has certain potential safety hazard.

In general, the sealing of ball valve need between sphere and the end cap between (ball sealing), end cap and the valve body between (sealing of body), valve rod and the valve body (rod seal) seal, the sealing configuration characteristics of conventional ball valve are, the Sealing of ball sealing is an annulus, the cross section is square, cut along diagonal and to stay part, the cross section becomes concave spherical surface, is close to sphere and seals; The Sealing of body sealing is that the cross section is the thin ring of rectangular circle; The Sealing of rod seal is that the cross section is foursquare annulus.

The material of above-mentioned Sealing generally is that plastics king or Expanded graphite are climbed root, these sealing materials are good in High Temperature High Pressure lower seal performance, high pressure helps sealing, elevated temperature heat expands and also helps sealing, these Sealings have soft or hard, and to require to give tight power bigger than rubber parts far away but rubber parts is compared.Therefore these sealing materials have just lost its sealing under vacuum state, normal temperature.In other words, it is not suitable for vacuum seal.

In the conventional ball valve, improve sealability and degree of vacuum by Sealing is strengthened impacting force, doing like this and bringing pair face sound is that driving torque is big, and the driver that needs to be equipped with also wants big, thereby uneconomical unbecoming.

Summary of the invention

The purpose of this utility model is the problem that exists at above-mentioned conventional ball valve, provide a kind of simple in structure, sealability reliable, easily drive, the Vacuum ball valve of long service life.

To achieve these goals, the utility model adopts following technological scheme:

This Vacuum ball valve comprises a valve body, a spheroid, a valve rod, two end caps, spheroid is positioned at the valve body holding cavity, two end caps place the valve body both sides respectively, the valve rod upper end is for stretch the side, the lower end is flat gesture, valve rod vertically inserts in the valve body, and the crescent-shaped slot that inserts for the flat gesture in valve rod lower end is offered at the top of described spheroid; Described in the valve body holding cavity spheroid and end cap between Sealing is set, the swallow-tail form seal groove is offered in Sealing and spherome surface contacting point, and " O " RunddichtringO is housed in the seal groove; Described valve rod places the sheathed packing ring of the part of valve body holding cavity and " O " RunddichtringO.

In the utility model Vacuum ball valve, the top of spheroid is offered the crescent-shaped slot that inserts for the flat gesture in valve rod lower end, described valve rod places the sheathed packing ring of the part of valve body holding cavity and " O " RunddichtringO, especially the swallow-tail form seal groove is offered in Sealing that will be provided with between spheroid in the valve body holding cavity and end cap and spherome surface contacting point, " O " RunddichtringO is housed in the seal groove, make between sphere and the end cap, sealing more between valve rod and the valve body, need not to improve sealability and degree of vacuum by Sealing is strengthened impacting force, the required driving torque of ball valve is little, easily drive long service life.

Description of drawings

Fig. 1 is the utility model ball-valve structure schematic representation.

Fig. 2 is the utility model ball valve schematic side view.

Embodiment

See also Fig. 1, shown in Figure 2,

The utility model Vacuum ball valve mainly comprises valve body 1, the holding cavity of valve body 1 is built-in with spheroid 2, valve body 1 both sides are equipped with two end caps 3, two end cap 3 contains spheroid 2 with valve body 1, have between spheroid 2 both sides and the end cap 3 two Sealings 4 are set respectively, offer swallow-tail form seal groove 5 at these two Sealings 4 respectively with spheroid 2 surperficial contacting points, adorn " O " RunddichtringO 6 in the seal groove 5,6 pairs of spheroids 2 of seal ring play the primary seal effect, in addition at the back side of these two Sealings 4, just respectively establish " O " RunddichtringO 7 between two Sealings 4 and the end cap 3, also establish respectively at valve body 1 left and right sides end face and two end cap 3 plane contact places and to put " O " RunddichtringO 8, can guarantee the sealing of valve body 1 and end cap 3 like this.Valve body 1 top is square flange, its central authorities open a hole that communicates with valve body 1 bottom, Kong Zhongshe is put a valve rod 9, valve rod 9 upper ends stretch 91 for the side, the lower end is flat gesture 92, the flat gesture 92 of stem lower portion is inserted the crescent-shaped slot of offering on spheroid 2 tops and is linked to each other, valve rod 9 middle parts are arranged with packing ring 10 and " O " RunddichtringO 11, packing ring 10 and " O " RunddichtringO 11 are provided with at interval, packing ring 10 and " O " RunddichtringO 11 respectively are three in this embodiment, its top is compressed by pressure ring 12 and seals, and pressure ring 12 is fixing with back-up ring 13 by the hole.

When stretch and is connected with handle the side that valve rod 9 exposes the square flange part of valve body 1, being the manual vacuum ball valve then, when being connected with pneumatic actuator, is pneumatic Vacuum ball valve then, when being connected with electric actuator, then is the Motorized vacuum ball valve.

In the described ball valve of this embodiment, also can respectively offer a relief hole (the not shown in the figures meaning out) at the place, two diagonal angles of swallow-tail form seal groove 5.

When assembling, because valve body its underpart has the reaming that the pore-throat portion of a dress ball has a dress valve rod and seal ring, and communicate with dress ball hole, valve rod is pushed in valve body dress ball hole, stretch with driving source and be connected valve rod top side, the valve rod middle part is contained by packing ring and seal ring, and the flat gesture of stem lower portion is connected with crescent-shaped slot on the spheroid, drives spheroid and rotates 90 °; Spheroid is pushed in the valve body, its top crescent-shaped slot and the flat gesture of valve rod match, back-up ring is pushed in the valve body both sides, " O " RunddichtringO is packed in the dovetail groove in the Sealing, again " O " the type Mi Quan between " O " type Mi Quan, end cap and the valve body at the Sealing back side is installed back screw Corner Strapped, " O " RunddichtringO and packing ring sheathed on the valve rod are compressed by pressure ring, and pressure ring is locked by back-up ring again.

Evidence, Vacuum ball valve leak rate of the present utility model can reach 1.3 * 10 ^-7Pa.L/s, life-span 〉=20000 time, driving torque also descends greatly.

Claims

1, a kind of Vacuum ball valve, this ball valve comprise a valve body, a spheroid, a valve rod, two end caps, and spheroid is positioned at the valve body holding cavity, two end caps place the valve body both sides respectively, the valve rod upper end is for stretch the side, the lower end is flat gesture, and valve rod vertically inserts in the valve body, it is characterized in that:

The crescent-shaped slot that inserts for the flat gesture in valve rod lower end is offered at the top of described spheroid;

Described in the valve body holding cavity spheroid and end cap between Sealing is set, the swallow-tail form seal groove is offered in Sealing and spherome surface contacting point, and " O " RunddichtringO is housed in the seal groove;

Described valve rod places the sheathed packing ring of the part of valve body holding cavity and " O " RunddichtringO.

2, Vacuum ball valve as claimed in claim 1 is characterized in that: described packing ring and " O " RunddichtringO that is sheathed on the valve rod is provided with at interval.

3, Vacuum ball valve as claimed in claim 1 is characterized in that: " O " RunddichtringO is set respectively between described valve body and the end covers at two sides.