CN217713880U

CN217713880U - Single-seat regulating valve

Info

Publication number: CN217713880U
Application number: CN202221514147.9U
Authority: CN
Inventors: 罗振宇; 梁超
Original assignee: Chongqing Brighty Instrument Co ltd
Current assignee: Chongqing Brighty Instrument Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-11-01
Anticipated expiration: 2032-06-16

Abstract

The utility model relates to the technical field of regulating valves, in particular to a single-seat regulating valve, which comprises a valve core and a valve rod, wherein the valve core is not welded with the valve rod, the single-seat regulating valve also comprises an end cover, the valve rod is connected with the valve core after being connected with the end cover through threads, and the end cover is welded with the valve core; the end cover is provided with a first notch at one end close to the valve core, a second notch at one end close to the end cover is provided with the valve core, the first notch and the second notch form a welding port, and the cross section of the welding port is polygonal. The utility model discloses an increase the end cover between valve rod and case, the valve rod passes the end cover and is connected with the case, and the end cover carries out welded connection with the case, and valve rod and case are with regard to not direct welding like this, and when consequently adjusting the case through the valve rod, stress can not concentrate on the valve rod, reduces the probability of valve rod and case disalignment, forms the polygon after first breach and the combination of second breach, increases the area of contact of solder and case, end cover for the welding is more firm.

Description

Single-seat regulating valve

Technical Field

The utility model relates to a governing valve technical field, concretely relates to single seat governing valve.

Background

The single-seat regulating valve is characterized in that a valve core and a valve seat are arranged in a valve body, the leakage quantity is small, the unbalanced force of the valve is large, the allowable pressure difference is smaller than that of a double-seat valve, the single-seat regulating valve is composed of a pneumatic multi-spring film actuating mechanism and a low-flow-resistance through single-seat valve, the valve core of the regulating valve of the single-seat valve is provided with a curved surface (such as a parabolic curved surface shape) for regulating the percentage flow, and the purpose of regulating the flow quantity is realized by regulating the size of the flow area between the valve seat and the curved surface.

The valve rod is connected with the case, adjusts the flow area between case and the disk seat, as shown in fig. 1, the case 1 of current single seat governing valve is direct and weld between the valve rod 2, and the stress ratio of receiving owing to the welding of the junction of valve rod 2 and case 1 is than, and the valve rod 2 is out of shape easily after long-time the use like this for the axiality between valve rod 2 and the case 1 can the variation, causes the problem of valve jamming easily.

SUMMERY OF THE UTILITY MODEL

The utility model discloses thereby to welding between present valve rod and the case through valve rod adjusting valve core, when carrying out flow control, at the welding department, the stress of valve rod is bigger, and easy deformation uses the problem that probably valve rod and case disalignment for a long time, provides a single seat governing valve.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

a single-seat regulating valve comprises a valve core, a valve rod and an end cover, wherein the valve core is not welded with the valve rod; the end cover is provided with a first notch at one end close to the valve core, a second notch at one end close to the end cover is provided with the valve core, the first notch and the second notch form a welding port, and the cross section of the welding port is polygonal.

Preferably, the cross sections of the first notch and the second notch are both triangular, a gap is formed between the end cover and the valve core, and the cross section of the welding port is trapezoidal.

Preferably, a boss is arranged on the valve rod and positioned between the end cover and the valve core. The boss is located gap department, has both carried out spacing to the valve rod like this and has also carried out the ration to the gap of case and end cover up to now for whole gap is even.

Preferably, one end of the valve core, which is close to the end cover, is provided with a connecting hole, one side of the inner wall of the connecting hole, which is close to the end cover, is in a horn shape, the valve rod comprises a connecting section and a control section, the connecting section is provided with an inclined part corresponding to the connecting hole, and the inclined part is connected with the boss. The existing valve rod is directly arranged in a cylindrical mode and penetrates into the valve core, the valve rod is positioned in a clearance fit mode, the requirement on machining precision is higher in the positioning mode, machining difficulty is higher, taper positioning is formed when the inclined part is matched with the horn-shaped connecting hole of the valve core, and machining difficulty is reduced while machining precision is guaranteed.

Preferably, the included angle α between the inclined portion and the boss is an obtuse angle, which corresponds to that the end connecting the valve rod and the valve core is vertically upward, and the cross section of the inclined portion is similar to a vertical "eight" shape, rather than an inverted "eight" shape, so that the diameter of the valve rod from the boss to the side of the valve core is gradually reduced rather than gradually enlarged, which is beneficial to reducing the stress of the valve rod.

Preferably, the diameter of the connecting section is smaller than that of the control section, that is, the diameter of the valve rod connected with the valve core is smaller than that of the rest section of the valve rod.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses an increase the end cover between valve rod and case, the valve rod passes the end cover and is connected with the case, and the end cover carries out welded connection with the case, and valve rod and case are with regard to not direct welding like this, and when consequently adjusting the case through the valve rod, stress can not concentrate on the valve rod, reduces the probability of valve rod and case disalignment, forms the polygon after first breach and the combination of second breach, increases the area of contact of solder and case, end cover for the welding is more firm.

Description of the drawings:

fig. 1 is a schematic structural diagram of a single seat regulating valve in the prior art.

FIG. 2 is a schematic structural view of a single-seat regulator valve provided herein;

FIG. 3 is a schematic view of the valve stem of FIG. 2;

fig. 4 is a partial structural schematic diagram of the valve core in fig. 2.

The mark in the figure is: 1-valve core, 2-valve rod, 3-end cover, 4-first notch, 5-second notch, 6-welding port, 7-gap, 8-boss, 9-connecting hole, 10-connecting section, 11-control section and 12-inclined section.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

As shown in fig. 2, the utility model provides a single seat governing valve, including case 1 and valve rod 2, case 1 with valve rod 2 does not weld, still includes end cover 3, valve rod 2 with 3 threaded connection of end cover back with case 1 is connected, end cover 3 with 1 welding of case.

The end cover 3 is close to the one end of case 1 is equipped with first breach 4, the case 1 is close to the one end of end cover 3 is equipped with second breach 5, first breach 4 with second breach 5 forms welding mouth 6, the cross section of welding mouth 6 is the polygon. The cross sections of the first notch 4 and the second notch 5 are both triangular, a gap 7 is formed between the end cover 3 and the valve core 1, and the cross section of the welding port 6 is trapezoidal. The end cover 3 and the valve core 1 can also be contacted, so that the cross section of a welding port 6 formed by combining the two triangular first notches 4 and the two triangular second notches 5 is triangular. Of course, the shape of the first notch 4 and the second notch 5 can be directly related to a trapezoid, so that the shape of the first notch 4 and the second notch 5 after combination is also a trapezoid. The trapezoidal welding port 6 can increase the contact area of the welding flux with the valve core 1 and the end cover 3, so that the welding is firmer. In order to ensure that the welding is firm, the welding is carried out in a full welding mode at a welding port.

The valve rod 2 is provided with a boss 8, the boss 8 is positioned between the end cover 3 and the valve core 1, and the boss 8 is positioned between the end cover 3 and the valve core 1. The boss 8 is located at the gap 7 between the end cover 3 and the valve core 1, which is equivalent to quantifying the width of the gap 7, and the welded end cover 3 and the valve core 1 cannot be higher and lower. As shown in fig. 4, a connection hole 9 is formed in one end, close to the end cover 3, of the valve core 1, one side, close to the end cover 3, of the connection hole 9 is in a horn shape, the valve rod 2 includes a connection section 10 and a control section 11, an inclined portion 12 is arranged at a position, corresponding to the connection hole 9, of the connection section 10, and the inclined portion 12 is connected with the boss 8.

The angle a between the inclined portion 12 and the boss 8 is obtuse but less than 180 °. As shown in fig. 3, when the valve element 1 is upward after the valve element 1 is connected to the valve rod 2, the inclined portion 12 is in a positive splay shape, and the diameter of the valve rod 2 gradually decreases from the boss 8 upward, so that the stress at the connection position of the valve rod 2 and the valve element 1 can be reduced. And the diameter of the valve rod 2 positioned in the connecting hole 9 is smaller than that of the valve rod 2 positioned outside the valve core 1, namely the diameter of the connecting section 10 is smaller than that of the control section 11.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A single-seat regulating valve comprises a valve core (1) and a valve rod (2), and is characterized in that the valve core (1) is not connected with the valve rod (2) through welding, the single-seat regulating valve also comprises an end cover (3), the valve rod (2) is connected with the valve core (1) after being in threaded connection with the end cover (3), and the end cover (3) is welded with the valve core (1); the valve is characterized in that a first notch (4) is formed in one end, close to the valve core (1), of the end cover (3), a second notch (5) is formed in one end, close to the end cover (3), of the valve core (1), the first notch (4) and the second notch (5) form a welding port (6), and the cross section of the welding port (6) is polygonal.

2. The single-seat regulating valve according to claim 1, characterized in that the cross section of the first notch (4) and the cross section of the second notch (5) are both triangular, a gap (7) is arranged between the end cover (3) and the valve core (1), and the cross section of the welding port (6) is trapezoidal.

3. The single-seat regulating valve according to claim 2, characterized in that a boss (8) is provided on the valve stem (2), the boss (8) being located between the end cap (3) and the valve cartridge (1).

4. The single-seat regulating valve according to claim 3, wherein a connecting hole (9) is formed in one end, close to the end cover (3), of the valve core (1), one side, close to the end cover (3), of the inner wall of the connecting hole (9) is in a horn shape, the valve rod (2) comprises a connecting section (10) and a control section (11), an inclined portion (12) is arranged at the position, corresponding to the connecting hole (9), of the connecting section (10), and the inclined portion (12) is connected with the boss (8).

5. Single seat regulating valve according to claim 4, characterized in that the angle a between the inclined portion (12) and the boss (8) is obtuse.

6. Single seat regulating valve according to claim 4, characterized in that the diameter of the connecting section (10) is smaller than the diameter of the control section (11).