CN201802895U - Thrust device for valve - Google Patents

Abstract

The utility model discloses a thrust device for a valve, which comprises a valve rod, a thrust ring, a limit ring, a valve cap and a shaft cover, wherein the thrust ring is limited vertically by the limit ring to be embedded into an annular concave hole at the top of the valve cap and is fixed by the shaft cover; the valve rod passes through the valve cap, the thrust ring, the limit ring and a center hole of the shaft cover and is limited by the thrust ring at the position coaxial with the vertical center line of the valve; a thrust groove with an R-angle arc section is radially arranged on the outer circumferential surface at the upper part of the valve rod; the inner circumferential surface of the thrust ring is set into a thrust bulge with an R-angle arc section; and the thrust bulge on the valve rod is basically matched with the thrust groove on the thrust ring. The thrust device for the valve can reduce the sealing torsion and the operation torsion of the valve rod, prolong the service life of related parts and solve the problem that the assembly is difficult.

Description

The valve thrust device

Technical field

The utility model relates to valve, is specifically related to a kind of valve thrust device that can realize dark bar operating function.

Background technique

Widely used valve mostly is gate valve in the pipe network system, weighlock plate valve, gate valve again, and it drives closure member (flap) by valve rod and moves along the Vertical direction of valve seat center line and cut off pipeline internal medium and flow.

Inside screw non-rising stem type gate valve wherein, the motion thread that drives closure member is arranged on the valve rod lower end, and valve rod can only rotate can't lifting, and to volume, the weight that reduces valve, it is highly beneficial to reduce problem such as mounting point.

The thrust device of the present inside screw non-rising stem type gate valve that uses, the thrust projection on its valve rod and the cross section of the thrust groove on the thrust ring are rectangle, when both are identical because be face contact, so have that packing torque is big, valve rod operation moment of torsion is big, an assembling difficulty, the wearing and tearing of correlated parts fatiguability and cause with short shortcoming of life-span.

Summary of the invention

The purpose of this utility model is at the deficiencies in the prior art, and a kind of valve thrust device is provided, and can reduce packing torque and valve rod operation moment of torsion, prolongs the correlated parts life-span and solve the problem of assembling difficulty.

Valve thrust device of the present utility model is made up of valve rod, thrust ring, limited ring, valve gap and shaft-cup; Described thrust ring is embedded in the top annular shrinkage pool of valve gap down the spacing up and down of limited ring, is fixed by shaft-cup; The center hole that described valve rod passes valve gap, thrust ring, limited ring and shaft-cup by thrust ring spacing with the coaxial position of valve vertical center line on; Described valve rod upper periphery face diameter is to the thrust groove that a cross section is a R angle circular arc is set; Described thrust ring inner peripheral surface is configured to the thrust projection that the cross section is all R angle circular arc; Thrust projection on the valve rod is identical substantially with the thrust groove on the thrust ring.Because moving element thrust projection and thrust groove change the basic R angle circular cross-section that coincide into, its outer surface that may contact reduces, and in actual the use, in fact both ways of contact become the line contact because of the existence of the machining tolerance of circular cross-section.Like this, a result seals, locatees the moment of torsion that needs by shaft-cup to reduce; Another result is, when operating valve lever, the thrust projection of line contact and the mutual imposed load of thrust groove and point of contact constantly generation roll distortion, its deformation tendency is that thrust is protruding and the thrust groove is easier to coincide and the contact position is more and more smooth, the surface friction ractor reduces gradually, thereby guarantee lower valve rod operation moment of torsion, alleviate the pressure that correlated parts bears, thereby also reach the effect that prolongs part life.

As a kind of improvement of the present utility model, described thrust ring is made up of left semi-ring and right semi-ring, is convenient to the installation of thrust device.

Valve thrust device of the present utility model, adopt the R angle circular arc of thrust groove and thrust projection to coincide, when adding external force in its installation, in using and coincideing, can guarantee that valve rod axis does not depart from the valve vertical center line, thereby the power that acts on the valve rod can be because of the skew produce power loss of valve rod axis.

Below in conjunction with accompanying drawing the utility model valve just being pushed away device is further described.

Description of drawings

Fig. 1 is the plan view of valve rod in the known valve thrust device;

Fig. 2 is the structure sectional view of thrust ring in the known valve thrust device;

Fig. 3 is the structural representation of the utility model valve thrust device when using in valve;

Fig. 4 is the partial front elevation view of valve rod in the utility model valve thrust device;

Fig. 5 is the structure sectional view of thrust ring in the utility model valve thrust device.

Wherein 1 is valve rod, and 2 is thrust ring, and 3 is valve gap, and 4 is shaft-cup, and 5 is limited ring.

Embodiment

Illustrated in figures 1 and 2 is that front background technique part is mentioned valve rod and the thrust ring in the existing valve thrust device, with this as can be seen, the thrust groove on the valve rod 1 and the cross section of the thrust projection on the thrust ring 2 are rectangle, both are in the use that coincide, it is in contact with one another and is the face contact, friction is big, and the moment of torsion of operating valve lever 1 is big, and parts depreciation is big to influence working life; Because of the cross section is that rectangle coincide, difficulty is installed also.

In the utility model, for reducing valve rod 1 operation moment of torsion, reduce the thrust groove and contact friction with the thrust projection, as shown in Figure 4 and Figure 5, the upper periphery face diameter of valve rod 1 is to the thrust groove that a cross section is a R angle circular arc is set; Accordingly, the inner peripheral surface of thrust ring 2 is provided with the thrust projection that the cross section is all R angle circular arc; Thrust groove and the thrust projection on the thrust ring 2 on the valve rod 1 are identical substantially.On the one hand, arc contact surface is little than the rectangle surface of contact; On the other hand, machining tolerance because of circular arc, actual contact was the line contact during circular arc coincide, thereby the real contact area of valve rod 1 and thrust ring 2 is far smaller than the area of contact of valve rod 1 and thrust ring 2 in the existing valve thrust device in the utility model valve thrust device, thereby its contact friction is little, the little wearing and tearing of part stress are little, reached to reduce friction, the effect that reduce valve rod 1 operation moment of torsion, prolongs part life.As shown in Figure 3, when the utility model valve thrust device is installed, the upper end of valve rod 1 penetrates two limited rings 5 up and down, up and down between the limited ring 5, thrust projection with the left and right sides semi-ring of thrust ring 2, thrust groove on valve rod 1 pieces together an annulus, and successively with the lower limit ring, thrust ring 2 integral body and upper limit ring embed in the annular shrinkage pool at valve gap 3 tops, at this moment, the top of shaft-cup 4 from valve rod 1 is penetrated, be connected with valve gap 3 by screw, under the active force of shaft-cup 4, the left and right sides semi-ring of thrust ring 2 trends towards stressed and constantly reinforcing of the thrust groove on valve rod 1 simultaneously on the direction vertical with the valve vertical center line, and final thrust ring 2 is limited to the position coaxial with the valve vertical center line with valve rod 1, thereby realizes conveniently installing.Thrust groove and the protruding correct shortcoming of installing of complete involutory ability that needs of thrust in the existing valve thrust device installation have been overcome.

In addition, the axis of valve rod 1 did not depart from the vertical center line of valve during valve thrust device of the present utility model can be guaranteed to install, use, thereby the power that acts on the valve rod can be because of the skew produce power loss of valve rod axis.

Claims (2)

1. a valve thrust device is made up of valve rod (1), thrust ring (2), limited ring (5), valve gap (3) and shaft-cup (4); Described thrust ring (2) is embedded in the top annular shrinkage pool of valve gap (3) down the spacing up and down of limited ring (5), is fixed by shaft-cup (4); The center hole that described valve rod (1) passes valve gap (3), thrust ring (2), limited ring (5) and shaft-cup (4) by thrust ring (2) spacing with the coaxial position of valve vertical center line on, it is characterized in that: described valve rod (1) upper periphery face diameter is to the thrust groove that a cross section is a R angle circular arc is set; Described thrust ring (2) inner peripheral surface is configured to the thrust projection that the cross section is all R angle circular arc; Thrust projection on the valve rod (1) is identical substantially with the thrust groove on the thrust ring (2).

2. valve thrust device according to claim 1 is characterized in that: described thrust ring (2) is made up of left semi-ring and right semi-ring.

Images