Welding straight-through type vacuum stop valve with low flow resistance

Abstract

The utility model discloses a welding straight-through type vacuum stop valve with low flow resistance, and belongs to the technical field of vacuum stop valves, the welding straight-through type vacuum stop valve comprises a valve body, a valve seat, a valve core, a valve rod, a valve cover and a corrugated pipe, the valve body comprises an upper section cylinder and a lower section cylinder, the valve cover abuts against the upper section cylinder, the lower section cylinder is welded with the valve seat in a sealing mode, and the corrugated pipe is connected with the valve seat in a sealing mode. The valve element is movably arranged in the upper section cylinder, and the valve seat is arranged in the lower section cylinder. The valve seat is of a T-shaped two-way tubular structure and comprises a right through end and a lower through end, the right through end is in contact connection with the valve element, and the lower through end is communicated with the right through end; the interior of the valve element is in threaded connection with the valve rod, and a corrugated pipe is arranged on the outer side of the valve element. The combined welding process is adopted for the whole valve, the manufacturing difficulty is low, compared with the forging process, the structure is simple, compared with an original valve body, the welding structure greatly reduces the using amount of metal materials on the basis of guaranteeing the strength, and therefore the manufacturing cost of the valve is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve, specifically, a low flow resistance's welding straight -through formula vacuum stop valve. BACKGROUND

[0002] The corrugated pipe stop valve internally adopts corrugated pipe structure, and the lower end of the stainless steel corrugated pipe is welded on the valve rod to prevent process fluid from eroding the valve rod. The other end is arranged between the valve body and the valve cover to form static sealing. The straight-through stop valve body is usually formed by casting or integral forging to solve the forming problem of the complex channel structure of the valve body. However, the casting process is prone to cause defects such as sand holes, pores and slag inclusion in the parts, especially the pores are prone to outgassing in the vacuum environment, which can easily reduce the system vacuum degree and affect the mechanical properties and sealing quality of the vacuum valve body. The material utilization rate is low in the forging process, the cost is high, and the complex internal cavity cannot be integrally formed, and further finishing is required, which prolongs the processing cycle.

[0003] The utility model discloses a kind of corrugated pipe stop valves of general use, including valve body, valve rod, valve core, insulation plate and corrugated pipe, the valve body is three-way tubular structure, the side pass-through end of the valve body is import end, one straight-through end of the valve body is export end, another straight-through end is closed and is provided with valve cover, the import end is communicated with export end and forms medium flow channel;The valve rod is coaxially arranged with the two straight-through ends of valve body, the valve rod is slidably arranged by penetrating valve cover, the valve rod is provided with valve core to the export end, the valve core is correspondingly arranged with export end, the valve rod is coaxially sleeved with circular insulation plate, the insulation plate slides in the straight-through end of valve body, the corrugated pipe is sleeved on the outside of valve rod, and the two ends of the corrugated pipe are respectively connected with valve cover and insulation plate.The utility model although simple structure, but cannot play the role of low flow resistance, light valve body, the purpose of the utility model is to overcome the deficiencies of prior art, provide a kind of low flow resistance's welding straight -through formula vacuum stop valve, adopt welding process instead of forging process, reduce valve body weight, reduce valve body processing difficulty, improve valve production efficiency.

[0004] In view of this, the present inventors have carried out in-depth research on this demand, and thus the present case has been produced. UTILITY MODEL CONTENTS

[0005] The utility model is to provide a kind of low flow resistance's welding straight -through formula vacuum stop valve to solve the problems raised in the above background art.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The application discloses a low-flow-resistance welded straight-through vacuum stop valve, which comprises a valve body, a valve seat, a valve core, a valve rod, a valve cover and a bellows, the valve body comprises an upper section cylinder and a lower section cylinder which are coaxially fixedly connected, the valve cover abuts against the free end of the upper section cylinder, the free end of the lower section cylinder is sealingly welded with the valve seat, the valve core is movably arranged in the upper section cylinder, and the valve seat is arranged in the lower section cylinder; the valve seat is a T-shaped two-way tubular structure, the valve seat comprises a right through end and a lower through end, the right through end is in contact with the valve core, and the lower through end is in communication with the right through end; the valve core is internally threadedly connected with the valve rod, the valve core is externally provided with the bellows, and the valve core is externally provided with an extension at one end close to the valve seat; and one end of the bellows is welded with the extension.

[0008] By arranging the valve body into a sectional cylinder structure, the upper section facilitates the movement of the bellows, the lower section facilitates the placement of the valve seat at a correct welding position, the inner cavity space of the valve body is smaller, the remaining material is less, and the structure is more compact. The valve seat is a T-shaped tubular structure, and the flow resistance is smaller compared with the existing valve passage. In addition, the whole stop valve is combined by welding, the metal material usage is greatly reduced on the basis of ensuring the strength, so that the valve manufacturing cost and manufacturing difficulty are reduced, and the structure is simpler compared with a forging process.

[0009] Preferably, opposite sides of the lower section cylinder are respectively provided with an inlet hole and an outlet hole, the inlet hole and the outlet hole are respectively correspondingly welded with an inlet end flange and an outlet end flange, and the inlet end flange and the outlet end flange form a straight-through pipeline with the holes in the opposite sides of the valve body.

[0010] Preferably, the inner diameter of the upper section cylinder is smaller than that of the lower section cylinder, and the outer wall section of the upper section cylinder is circular or square. By arranging the inner diameter of the upper section cylinder to be smaller than that of the lower section cylinder, the inner cavity medium flow passage section formed between the bellows and the valve body is smaller, and the remaining material is less.

[0011] Preferably, the valve seat further comprises a left side end which is sealingly welded with the free end of the lower section cylinder, the lower through end is in communication with the outlet end flange and is welded with the outlet hole.

[0012] Preferably, the outer wall section of the right through end is square or circular, and the inner wall section is circular; and the inner and outer wall sections of the lower through end are circular.

[0013] Preferably, the bellows is provided with a transition plate at one end close to the valve cover, and the bellows is sealingly abutted with the valve cover through the transition plate.

[0014] Preferably, a sealing gasket is arranged between the valve body and the transition plate, the transition plate is fixed to the valve cover by bolt pressing, and the bolt pressing extends to the flange of the sealing gasket and the valve body.

[0015] Preferably, the valve rod is threadedly connected to the inside of the valve core through the valve cover, and a hand wheel is fixedly arranged at the free end of the valve rod.

[0016] Preferably, a limiting key for limiting rotation of the valve core is arranged at one end side of the valve core close to the valve cover, and the limiting key abuts against the transition plate through the sealing gasket.

[0017] Preferably, a valve core sealing gasket is arranged at one end of the outer wall of the valve core close to the valve seat, and the valve core sealing gasket comprises any one of a non-metal flat gasket, a metal surfacing or a non-metal O-ring gasket. The valve core is connected to the transition plate through a spline structure, the valve core is limited by a spline groove and cannot rotate, only performs vertical linear motion, and flexible opening and closing of a sealing passage of the valve are realized.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) The valve body is arranged as a segmented cylindrical structure, the upper segment is convenient for movement of the bellows, the lower segment is convenient for placement of the valve seat at a correct welding position, the inner cavity space of the valve body is smaller, material reservation is less, and the structure is more compact. The valve seat is a T-shaped tubular structure, and the flow resistance is smaller compared with the existing valve passage.

[0020] (2) The valve adopts a combined welding process, and the manufacturing difficulty is low. Compared with a forging process, the welding structure greatly reduces the amount of metal material on the basis of ensuring the strength, thereby reducing the valve manufacturing cost.

[0021] (3) The valve core is connected to the transition plate through a spline structure, the valve core is limited by a spline groove and cannot rotate, only performs vertical linear motion, and flexible opening and closing of a sealing passage of the valve are realized. When the valve is operated, the hand wheel rotation drives the valve core to move, the valve core is limited by the spline groove, the rotation of the hand wheel is converted into vertical motion of the valve core, and opening and closing of the sealing passage are realized. The spline makes the transition plate and the valve core bear stress uniformly, and stress concentration is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 is a sectional structure schematic view of the utility model;

[0024] Figure 2 is a structure schematic view of the valve body of the utility model Figure One ;

[0025] Figure 3 is a structure schematic view of the valve body of the utility model Figure Two ;

[0026] Figure 4 is a structure schematic view of the valve seat of the utility model;

[0027] Figure 5 is a structure schematic view of the valve core of the utility model Figure One ;

[0028] Figure 6 is a structure schematic view of the valve core of the utility model Figure Two ;

[0029] Figure 7 is a structure schematic view of the valve core of the utility model Figure Three .

[0030] Wherein, 1, valve body;101, upper section cylinder;102, lower section cylinder;103, inlet hole;104, outlet hole;2, valve seat;201, right through end;202, lower through end;203, left side end;3, valve core;301, nonmetallic flat gasket;302, metal overlay;303, nonmetallic O-shaped ring gasket;4, valve rod;5, valve cover;6, bellows;7, inlet end flange;8, outlet end flange;9, transition plate;10, sealing gasket;11, hand wheel. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0032] In the description of the following utility model, it is necessary to explain that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation. The term "connection" only represents the connection between devices, and has no special meaning.

[0033] Furthermore, the technical field and installation mode involved in the embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] The present embodiment fully analyzes the problems such as part defects, reduced system vacuum, high cost, and long processing cycle caused by the casting forming or integral forging forming method in the prior art, and designs a low-flow-resistance welded straight-through vacuum stop valve.

[0035] As shown in Figures 1-4 The utility model provides a kind of low-flow-resistance welded straight-through vacuum stop valve, including valve body 1, valve seat 2, valve core 3, valve stem 4, valve cover 5 and bellows 6, valve body 1 includes coaxially fixed connection upper section cylinder 101 and lower section cylinder 102, valve cover 5 is abutted on the free end of upper section cylinder 101, the free end of lower section cylinder 102 is sealedly welded with valve seat 2, valve core 3 is movably placed in upper section cylinder 101, valve seat 2 is placed in lower section cylinder 102 inside;Valve seat 2 is T-shaped two-way tubular structure, valve seat 2 includes right pass end 201 and lower pass end 202, right pass end 201 is connected with valve core 3, and lower pass end 202 is communicated with right pass end 201;Valve core 3 is internally threaded with valve stem 4, valve core 3 outside is equipped with bellows 6, and one end of bellows 6 is welded to the extension.

[0036] By setting valve body 1 as segmented cylinder structure, upper section facilitates the movement of bellows 6, lower section facilitates the placement of valve seat 2 at correct welding position, so that the inner cavity space of valve body 1 is smaller, material is less, and structure is more compact.Valve seat 2 is T-shaped tubular structure, and compared with the existing valve passage, the flow resistance is smaller.In addition, the stop valve is integrally formed by welding process, which greatly reduces the amount of metal material on the basis of ensuring strength, thereby reducing the valve manufacturing cost and manufacturing difficulty, and compared with forging process, the structure is simpler.

[0037] As a preferred embodiment, opposite sides of lower section cylinder 102 are respectively provided with inlet hole 103 and outlet hole 104, and inlet end flange 7 and outlet end flange 8 are respectively welded at inlet hole 103 and outlet hole 104, and inlet end flange 7 and outlet end flange 8 form straight-through pipeline with the holes on opposite sides of valve body 1.

[0038] As a preferred embodiment, the inner diameter of upper section cylinder 101 is smaller than the inner diameter of lower section cylinder 102, and the outer wall cross section of upper section cylinder 101 is circular or square.By making the diameter of upper section cylinder 101 smaller than the diameter of lower section cylinder structure 102, the inner cavity medium flow passage formed between bellows 6 and valve body 1 is smaller, and the material is less.

[0039] As a preferred embodiment, the valve seat 2 further comprises a left side end 203 sealingly welded with the free end of the lower section cylinder 102, the lower through end 202 is communicated with the outlet end flange 8 and welded with the outlet hole 104.

[0040] As a preferred embodiment, the outer wall of the right through end 201 is square or circular in cross section, and the inner wall is circular in cross section; the inner and outer walls of the lower through end 202 are both circular in cross section.

[0041] As a preferred embodiment, the corrugated pipe 6 is provided with a transition plate 9 at the end close to the valve cover 5, and the corrugated pipe 6 sealingly abuts against the valve cover 5 through the transition plate 9.

[0042] As a preferred embodiment, a sealing gasket 10 is arranged between the valve body 1 and the transition plate 9, and the transition plate 9 is fixedly connected with the valve cover 5 through bolts, which extend to the flanges of the sealing gasket 10 and the valve body 1.

[0043] As a preferred embodiment, the valve stem 4 is threadedly connected with the inner side of the valve core 3 through the valve cover 5, and the free end of the valve stem 4 is fixedly provided with a hand wheel 11.

[0044] As a preferred embodiment, the valve core 3 is provided with a limiting key at the end close to the valve cover 5 for limiting the rotation of the valve core 3, and the limiting key abuts against the transition plate 9 through the sealing gasket 10.

[0045] As a preferred embodiment, the outer wall of the valve core 3 is provided with a valve core sealing gasket at the end close to the valve seat 2, which comprises any one of a non-metallic flat gasket 301, a metal build-up welding 302 or a non-metallic O-ring gasket 303. The valve core 3 is connected with the transition plate 9 through a spline structure, and is limited by a spline groove and cannot rotate, only performing vertical linear motion to realize flexible opening and closing of the valve sealing passage.

[0046] The working principle of the device is as follows: the inlet end flange 7 and the outlet end flange 8 form a straight-through pipeline with the opposite sides of the lower section cylinder 101, the valve seat 2 is a T-shaped two-way structure, the left side end 203 of the valve seat 2 is welded with the valve body 1, the lower through end 202 is communicated with the outlet end flange 8, one end of the corrugated pipe 6 is welded on the valve core 3, and the other end is abutted on the transition plate 9, so that the inner cavity of the valve is isolated from the outside. The end of the valve core 3 close to the valve cover 5 is provided with a spline structure, and the other end is provided with a channel sealing structure, so as to ensure the channel sealing of the valve. The valve stem 4 is connected with the valve core 3 through threads, and the other end is fixed with the hand wheel 11. When operating the valve, the hand wheel 11 is rotated, and the rotation of the valve stem 4 drives the valve core 3 to start moving. The spline groove structure is designed on the valve core 3, and the spline matched with the spline groove structure is designed on the valve stem 4. When the rotation of the hand wheel 11 is transmitted to the valve core 3, the valve core 3 cannot rotate with the hand wheel 11, but can only move vertically in the spline groove. In this way, the rotation of the hand wheel 11 is successfully converted into the vertical movement of the valve core 3. When the valve core 3 moves towards the hand wheel 11, the sealing channel is gradually opened, so that the medium can flow in the pipeline through the valve; when the valve core moves away from the hand wheel 11, the sealing channel is gradually closed, so that the medium is prevented from passing through, so as to realize the opening and closing control of the sealing channel of the valve, and achieve the purpose of controlling the flow or stop of the medium in the pipeline.

[0047] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low flow resistance welded through vacuum gate valve, characterized in that, The valve body (1) comprises a coaxially fixedly connected upper section cylinder (101) and lower section cylinder (102), the valve cover (5) abuts the free end of the upper section cylinder (101), the free end of the lower section cylinder (102) is sealingly welded with the valve seat (2), the valve core (3) is movably arranged in the upper section cylinder (101), and the valve seat (2) is arranged inside the lower section cylinder (102); The valve seat (2) is a T-shaped two-way tubular structure, the valve seat (2) comprises a right through end (201) and a lower through end (202), the right through end (201) is in contact with the valve core (3), and the lower through end (202) is communicated with the right through end (201); The valve core (3) is internally screwed with the valve rod (4), the valve core (3) is externally provided with a bellows (6), one end of the bellows (6) is welded to an extension on the outer side of one end of the valve core (3) close to the valve seat (2).

2. A low flow resistance welded through vacuum gate valve according to claim 1, characterized in that Opposite sides of the lower section cylinder (102) are respectively provided with an inlet hole (103) and an outlet hole (104), the inlet hole (103) and the outlet hole (104) are respectively correspondingly welded with an inlet end flange (7) and an outlet end flange (8), and the inlet end flange (7) and the outlet end flange (8) form a straight-through pipeline with the holes on opposite sides of the valve body (1).

3. A low flow resistance welded through vacuum gate valve according to claim 1, characterized in that The inner diameter of the upper section cylinder (101) is smaller than that of the lower section cylinder (102), and the outer wall section of the upper section cylinder (101) is circular or square.

4. A low flow resistance welded through vacuum gate valve according to claim 2, characterized in that The valve seat (2) further comprises a left side end (203) sealingly welded with the free end of the lower section cylinder (102), the lower through end (202) is communicated with the outlet end flange (8) and welded with the outlet hole (104).

5. A low flow resistance welded through vacuum gate valve according to claim 4, characterized in that The outer wall section of the right through end (201) is square or circular, and the inner wall section is circular; the inner and outer wall sections of the lower through end (202) are circular.

6. A low flow resistance welded through vacuum gate valve according to claim 1, characterized in that One end of the bellows (6) close to the valve cover (5) is provided with a transition plate (9), and the bellows (6) is sealingly abutted with the valve cover (5) through the transition plate (9).

7. A low flow resistance welded through vacuum gate valve according to claim 6, characterized in that A sealing gasket (10) is arranged between the valve body (1) and the transition plate (9), the transition plate (9) and the valve cover (5) are fixed by bolt pressing, and the bolt pressing extends to the flanges of the sealing gasket (10) and the valve body (1).

8. A low flow resistance welded through vacuum gate valve according to claim 1, characterized in that The valve rod (4) is threadedly connected with the inside of the valve core (3) through the valve cover (5), and a hand wheel (11) is fixedly arranged at the free end of the valve rod (4).

9. A low flow resistance welded through vacuum gate valve according to claim 7, characterized in that A limiting key for limiting rotation of the valve core (3) is arranged on one end side of the valve core (3) close to the valve cover (5), and the limiting key is abutted with the transition plate (9) through the sealing gasket (10).

10. A low flow resistance welded through vacuum gate valve according to claim 7, characterized in that The outer wall of the valve core (3) is provided with a valve core sealing gasket at one end close to the valve seat (2), and the valve core sealing gasket comprises any one of a non-metal flat gasket (301), a metal surfacing (302) or a non-metal O-ring gasket (303).

Images