CN2057256U

CN2057256U - Driven valve elevating stem means

Info

Publication number: CN2057256U
Application number: CN 89205479
Authority: CN
Inventors: 李景海
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-10-30
Filing date: 1989-10-30
Publication date: 1990-05-16

Abstract

The utility model provides an elevating stem means for a valve industry. The utility model changes the geometric shapes of parts to be relevant to the processes of a valve opening and a valve closing. The upper end of a valve cover 7b is provided with an annular bump with a section as R. A lower end is provided with the annular bump with a section R. (The annular bump can be a triangle, a trapezoid or an arc). The inner of the cylindrical hole F of the valve cover 7b is opened with an oil sump to enhance the functions of oil storing and lubrication, decrease a friction moment and enhance the sealing specific pressure and the sealing performance of a valve. The valve is easy and handy to be opened and closed.

Description

Driven valve elevating stem means

The utility model is applicable to the occasion that adopts the feed screw nut transmission in the mechanical industry simultaneously for the valve industry provides a kind of lifting bar device.

The valve that relies on external force control to open and close is referred to as to drive valve usually, the valve rod, the Stem Mut transmission that drive valve often have swingle, rotation and lifting bar and lifting bar, so-called lifting bar is meant a valve rod straight line lifting in the valve opening and closing process and does not rotate, lifting bar is to the without hindrance moment of filler, sealability to filler is better, its structure height is constant simultaneously, helps remote control, thereby is widely used in valve field.

The lifting bar of prior art has two kinds of fundamental types, a kind of is that tape spool holds, a kind of not tape spool holds, what wherein tape spool held is functional, the motion thread of the Stem Mut that matches with the valve rod motion thread can design the top at Stem Mut, also can be in its underpart, its underpart person, can shorten the length of valve rod, improve the stability of valve rod.This complex structure, installing space is bigger, and manufacture cost is also high, the poor-performing that holds of tape spool not, because the loss of friction square is bigger, the general design of the motion thread of the Stem Mut that matches with the valve rod motion thread is in the bottom of Stem Mut.

The purpose of this utility model is to the not tape spool improvement of holding lifting bar of prior art, and it can substitute not that tape spool holds lifting bar, because therefore its better performances and cost is very low also can be selected to use in the occasion of the lifting bar that adopts tape spool to hold.

The technological scheme that the utility model solves:

The utility model is at valve gap 7b(Fig. 8) to have designed the cross section be the circular projection of R in the upper-end surface, having designed the cross section equally in its lower end surface is the circular projection of R '.The R(of the lower end surface C of handwheel 4 and valve gap 7b sees Fig. 3 in opening process like this), and the shoulder D that closes Stem Mut 5 in the closed procedure and the lower end surface R ' of valve gap 7b are that a kind of, line contact the fricting movement of (being actually a kind of extremely narrow face contacts).This circular cross section is the projection of R, R ', and its cross section also can be triangle, trapezoidal, arc or other geometrical shapies.This circular projection also can clocklike disconnect, and forms some friction fulcrums, can further reduce the friction square; This projection can design and also can design on the valve gap 7b on the C of the lower end surface of handwheel 4 and on the shoulder D of Stem Mut 5, and the down interior (see figure 8) of the cylindrical hole of valve gap 7b has designed oil groove, and oil groove also can design on the E of the cylndrical surface of Stem Mut 5.

Advantage of the present utility model:

Useless frictions square loss is less in the valve opening and closing process, can reduce opening force, strengthens and closes power, thereby improved seal pressure, and the sealability of valve improves.

Rational in infrastructure, can avoid the jam in the opening-closing process, valve opening and closing is rapid, and is safe and reliable.

Can reduce shaft length the design of the motion thread of the Stem Mut that matches with valve rod in the bottom of Stem Mut, improve the stability of valve rod and the life-span of valve.

No matter be level or vertical the installation, its store oil and greasy property are all good.Cost is low, and anufacturability is good.

Fig. 1 be prior art not tape spool hold the assembling schematic representation of lifting bar in the valve opening process.

Fig. 2 be prior art not tape spool hold the assembling schematic representation of lifting bar in the valve closing process.

Fig. 3 is the assembling schematic representation of the utility model (motion thread is on the top of Stem Mut) in the valve opening process.

Fig. 4 is the assembling schematic representation of the utility model (motion thread is on the top of Stem Mut) under the valve closing state.

Fig. 5 is the assembling schematic representation of the utility model (motion thread is in the bottom of Stem Mut) in the valve opening process.

Fig. 6 is the assembling schematic representation of the utility model (motion thread is in the bottom of Stem Mut) in the valve closing process.

Fig. 7 be prior art not tape spool hold the valve gap 7a part enlarged view of lifting bar.

Fig. 8 is a valve gap 7b part enlarged view of the present utility model.

1 is valve rod in the accompanying drawing, the 2nd, and junction of the edges of two sheets of paper screw, the 3rd, locking nut, the 4th, handwheel, the 5th, Stem Mut, the 6th, lubricating cup, 7a is the valve gap of prior art, 7b is a valve gap of the present utility model, and A is the upper-end surface of prior art valve gap 7a, and B is the lower end surface B of prior art valve gap 7a, C is the lower end surface of handwheel 4, D is the circular bead surface of Stem Mut 5, and E is the cylndrical surface of Stem Mut 5, and F is the cylindrical hole of valve gap 7a, valve gap 7b.

Below in conjunction with accompanying drawing prior art is further elaborated:

Drive counterclockwise handwheel 1, valve is in opening process (see figure 1) handwheel 4(Fig. 1 at this moment) upper-end surface A(Fig. 7 of lower end surface C and valve gap 7a) also relative friction of contact.

Drive clockwise handwheel 1, valve is in and closes the also relative friction of B face (Fig. 7) contact of circular bead surface D and the valve gap 7a of Stem Mut 5 at this moment of closed procedure (see figure 2).

The friction of this unlatching, the face that closes closed procedure and face is a kind of very big idle work loss, that is to say when driving handwheel unlatching or throttle down, opening force, close power and all can be subjected to very big loss, close the loss of power, cause the decline of valve sealing face specific pressure, the loss of opening force will make opens effort.This structure is to the geometric accuracy of correlated parts, perpendicularity, and planeness is had relatively high expectations, and is difficult to open and close otherwise occur " stuck " easily.This in addition structure has only lubricating cup, does not have oil groove, and store oil, greasy property are relatively poor.

Below in conjunction with accompanying drawing the utility model is further described:

Valve rod is by the related standards design, and left-handed motion thread is arranged at top.Junction of the edges of two sheets of paper screw 2 locking nuts 3 lubricating cups 6 are standard piece.The cubic hole that Stem Mut can be packed into is arranged in the middle of the handwheel 4, Stem Mut 5 can design by related standards, it is widely different turning of axisymmetric, the left-handed motion thread that cooperates with valve rod is arranged at inner chamber top, the v thread that screws with locking nut is arranged at top, the cylndrical surface E that there is shoulder D the bottom and can matches with valve gap 7b cylindrical hole F, there is a four directions that can penetrate hole, four directions, handwheel 4 centers at the middle part, valve gap 7b is a partial enlarged drawing, F is a cylindrical hole, in oil groove G is arranged, the cross section is arranged at top is the circular projection of R, the cross section is also arranged at the bottom is the circular projection of R '.

The mutual alignment of each part of the utility model and assembly relation:

Valve rod 1 threaded end is screwed in the internal thread of Stem Mut 5, the Stem Mut 5 cylindrical hole F in the valve gap 7b that packs into, handwheel four directions borehole jack on the four directions of Stem Mut 5, locking nut and Stem Mut 5, the top v thread screws and compresses handwheel 4, and is fixing with junction of the edges of two sheets of paper screw 2 then.

Open: it is left-handed to drive handwheel 4 drive Stem Muts 5 counterclockwise, and after the elimination movement clearance, at this moment the R annular projection of valve gap 7b contacts with the lower end surface C of handwheel 4 and relative movement, and 1 of valve rod does not rotate, and only does the straight line ascending motion.

Close: drive handwheel clockwise, it is left-handed to drive Stem Mut 5, the cross section of valve gap 7b is that the circular projection of R ' contacts with the shoulder D of Stem Mut 5 and relative movement after the elimination movement clearance, and 1 of valve rod does not rotate under the effect of Stem Mut, only makes the decline straight line motion.

Claims

1, a kind of driving valve lifting bar device of forming by valve rod 1, junction of the edges of two sheets of paper screw 2, locking nut 3, handwheel 4, Stem Mut 5, lubricating cup 6, valve gap 7b, it is the circular projection of R that there is the cross section upper end that it is characterized in that valve gap 7b, there is the circular projection of cross section R ' lower end, has oil groove in the cylindrical hole F of valve gap 7b.

2, driving valve lifting bar device according to claim 1 is characterized in that circular projection can be interrupted.

3,, it is characterized in that the cross section is that the circular projection of R can be on the C face of the lower end of handwheel 4 according to claim 1,2 described driving valve lifting bar devices.

4,, it is characterized in that the cross section is that the circular projection of R ' can be on the shoulder D of Stem Mut 5 face according to claim 1,2 described driving valve lifting bar devices.

5,, it is characterized in that the cross section is that the circular projection of R, R ' can be triangle, trapezoidal or arc according to claim 1,2 described driving valve lifting bar devices.

6, driving valve lifting bar device according to claim 1 is characterized in that oil groove can be on the E of the cylndrical surface of Stem Mut 5.