Low-temperature corrugated pipe stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a low-temperature corrugated pipe stop valve which comprises a valve body, a connecting piece is fixed on the upper surface of the valve body through a bolt, and a buffering mechanism used for buffering media is arranged on the left side of the valve body. The buffer mechanism comprises two buffer pipes, the two buffer pipes communicate with the two ends of the valve body, flange plates are fixed to the tail ends of the two buffer pipes, a fixing plate is fixed to the interior of one of the buffer pipes, a flowing cavity is formed in the fixing plate, and the two ends of the flowing cavity communicate with the two ends of the valve body. And a filter screen plate is fixed in the flowing cavity. By means of the buffer mechanism, a medium flows through the flowing cavity, when the medium flows, the filter screen plate can filter impurities in the flowing medium, when the medium flows, the flow limiting plate is pushed to move to drive the buffer spring to be compressed, the buffer effect is achieved, and damage to the valve element caused by too large impact force of the medium is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve especially relates to a low temperature bellows stop valve. BACKGROUND

[0002] The low temperature bellows stop valve is a kind of special valve, which combines the advantages of low temperature resistance and bellows sealing technology.The working principle of the bellows stop valve is similar to that of an ordinary stop valve.When the valve is in the closed state, the valve is closed by a handle or an electric motor mechanism, and the bellows is compressed and deformed, so that the sealing surface is tightly attached to the valve seat, thereby achieving the cutting and sealing of the fluid.When the valve needs to be opened, the valve is opened by a handle or an electric motor mechanism, and the bellows returns to its original shape, so that the fluid can pass through the valve, achieving the regulation and change of the fluid direction.

[0003] The existing bellows stop valve is welded to the valve stem and the valve cover, and cannot be disassembled, which is inconvenient to maintain, and for ultra-low temperature valves, the medium is easy to leak through the gap between the valve stem and the valve cover, resulting in a too low temperature at the packing and poor sealing performance.

[0004] The existing patent (publication number: CN219472898U) discloses a new type of ultra-low temperature bellows stop valve, which comprises a valve body, a valve disc, a metal gasket, a valve disc pressing block, a lip ring, an RPTFE gasket, a metal winding gasket, a valve disc pressing cover, a bellows, a connecting disc and a valve stem, the upper end of the bellows is welded to the connecting disc, and the lower end is welded to the valve disc pressing block, the valve disc pressing cover and the valve disc are connected by threads, which not only retains the good characteristics of the bellows stop valve, but also realizes the disassembly and maintenance of the bellows, without damaging the valve stem.

[0005] To solve the above problems, the existing patent provides a scheme in which the valve disc pressing cover and the valve disc are connected by threads, which retains the good characteristics of the bellows stop valve, realizes the disassembly and maintenance of the bellows, and does not damage the valve stem; however, when the internal medium just enters the stop valve, a large impact force is easily generated, and since the scheme lacks a medium buffering mechanism, the large pressure is easily directly applied to the valve core, causing damage. SUMMARY

[0006] The utility model aims at providing a low temperature bellows stop valve, the medium flows through the flow cavity, and the filter screen plate set can filter the impurities in the flowing medium when the medium flows, and the movement of the flow limiting plate driven by the medium flow will drive the compression of the buffer spring, realizing the buffering effect, reducing the damage of the large impact force of the medium to the valve core, to solve the problems raised in the above background.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a low temperature bellows stop valve, including the valve body, the upper surface of valve body is fixed with connecting piece through bolt, the left side of valve body is equipped with buffer mechanism for buffering medium,

[0008] The buffer mechanism includes a buffer pipe, the buffer pipe is provided with two, two buffer pipes are communicated at both ends of the valve body, the ends of two buffer pipes are fixed with flange plates, the inside of one of the buffer pipes is fixed with a fixed plate, a flow cavity is formed in the fixed plate, a filter screen plate is fixed in the flow cavity, a flow limiting plate is arranged on the right side of the flow cavity, and two movable rods penetrating through the inside of the fixed plate are fixed on the side wall of the flow limiting plate.

[0009] Preferably, the outer surface of the movable rod is sleeved with a buffer spring abutting and connected with the side wall of the fixed plate, and the upper surface of the connecting piece is fixed with a protective shell.

[0010] Preferably, the upper surface of the protective shell is fixed with a fixed cover through bolts, and the inside of the protective shell is provided with a driving mechanism for opening and closing the stop valve.

[0011] Preferably, the driving mechanism includes a stepper motor, the stepper motor is fixed in the inside of the protective shell through bolts, and a driving gear is fixed on the power output shaft of the stepper motor.

[0012] Preferably, one end of the driving gear is engaged with a driven gear, and a lead screw is fixed on the lower surface of the driven gear.

[0013] Preferably, the lower end of the lead screw is threadedly connected with a threaded pipe, and the outer surface of the threaded pipe is slidably connected with a limiting block fixedly connected with the connecting piece.

[0014] Preferably, the lower surface of the threaded pipe is fixed with a valve core, and the lower surface of the valve core is movably connected with a fixed core fixedly connected with the valve body.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. By setting the buffer mechanism, the medium flows through the flow cavity, and the filter screen plate can filter the impurities in the flowing medium when the medium flows, and the movement of the flow limiting plate driven by the medium flow will drive the buffer spring to compress, so as to realize the buffering effect and reduce the damage of the excessive impact force of the medium to the valve core.

[0017] 2. By setting the driving mechanism, when the lead screw rotates, the threaded pipe connected with the lead screw can move vertically, and when the threaded pipe moves, the valve core and the fixed core can be separated, the medium can flow through the inside of the valve body, and the fixed core is provided with a positioning groove matched with the valve core, so as to play the role of positioning. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 It is the overall structure view of the present application;

[0020] Figure 2 It is the half-section structure schematic diagram of the buffer pipe of the present application;

[0021] Figure 3 It is the half-section structure schematic diagram of the protective shell of the present application;

[0022] Figure 4 It is the overall structure view of the present application; Figure 2 It is the enlarged view of A in the figure.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, valve body;2, connecting piece;3, buffer pipe;31, flange plate;32, fixed plate;33, flow cavity;34, filter screen plate;35, flow limiting plate;36, movable rod;37, buffer spring;4, protective shell;5, fixed cover;6, stepping motor;61, driving gear;62, driven gear;63, screw rod;64, threaded pipe;65, limiting block;66, valve core;67, fixed core. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The present application provides a technical solution:

[0027] Please refer to Figures 1 to 4 A low-temperature corrugated pipe stop valve, comprising a valve body 1, a connecting piece 2 is fixed on the upper surface of the valve body 1 through bolts, and a buffer mechanism for buffering medium is arranged on the left side of the valve body 1;

[0028] The buffer mechanism comprises two buffer pipes 3, both of which are communicated at two ends of the valve body 1, and the end of each of the two buffer pipes 3 is fixed with a flange plate 31, the inside of one of the buffer pipes 3 is fixed with a fixed plate 32, the inside of the fixed plate 32 is provided with a flow cavity 33, the inside of the flow cavity 33 is fixed with a filter screen plate 34, the right side of the flow cavity 33 is provided with a flow limiting plate 35, the side wall of the flow limiting plate 35 is fixed with two movable rods 36 penetrating the inside of the fixed plate 32, the outer surface of the movable rod 36 is sleeved with a buffer spring 37 abuttingly connected with the side wall of the fixed plate 32, the upper surface of the connecting piece 2 is fixed with a protective shell 4, the upper surface of the protective shell 4 is fixed with a fixed cover 5 through bolts, and the inside of the protective shell 4 is provided with a driving mechanism for opening and closing the stop valve.

[0029] Through the above technical scheme, before the low-temperature corrugated pipe stop valve is used, the stop valve is first installed at a suitable position, the flange plate 31 and the external pipeline are connected and fixed through the buffer pipe 3 arranged on the valve body 1, when the medium passes through the inside of the buffer pipe 3, the flow limiting plate 35 is horizontally moved under the action of the medium pressure, at this time, the flow limiting plate 35 is separated from the fixed plate 32, the flow of the flow cavity 33 is removed, the medium can flow through the flow cavity 33, the filter screen plate 34 arranged during the medium flow can filter the impurities in the flowing medium, and the movable rod 36 arranged can play a guiding role, thereby reducing the deviation of the flow limiting plate 35 during movement, and the movement of the flow limiting plate 35 driven by the medium flow can drive the buffer spring 37 to be compressed, thereby realizing the buffering effect and reducing the damage of the excessive impact force of the medium to the valve core 66.

[0030] Specifically, as shown in Figure 1 , Figure 3 and Figure 4 , the driving mechanism comprises a stepping motor 6, the stepping motor 6 is fixed in the inside of the protective shell 4 through bolts, the power output shaft of the stepping motor 6 is fixed with a driving gear 61, one end of the driving gear 61 is engaged with a driven gear 62, the lower surface of the driven gear 62 is fixed with a lead screw 63, the lower end of the lead screw 63 is threadedly connected with a threaded tube 64, the outer surface of the threaded tube 64 is slidingly connected with a limiting block 65 fixedly connected with the connecting piece 2, the lower surface of the threaded tube 64 is fixed with a valve core 66, and the lower surface of the valve core 66 is movably connected with a fixed core 67 fixedly connected with the valve body 1.

[0031] By adopting the technical scheme, when in use, the stepping motor 6 arranged in the protective shell 4 drives the driving gear 61 to rotate, the driving gear 61 meshes with the driven gear 62 to rotate, and then drives the screw rod 63 to rotate, the sliding groove matched with the limiting block 65 is arranged on the outer surface of the threaded pipe 64, so that the threaded pipe 64 connected with the screw rod 63 can move vertically when the screw rod 63 rotates, and the valve core 66 and the fixed core 67 are separated when the threaded pipe 64 moves, at this time, the medium can flow through the inside of the valve body 1, the bolt on the connecting piece 2 can be unscrewed, the connecting piece 2 can be disassembled, and the fixed cover 5 arranged can be disassembled from the protective shell 4, so that the parts inside the protective shell 4 can be maintained.

[0032] Working principle: the flange plate 31 and the external pipeline are connected and fixed by using the bolt, in use, the stepping motor 6 arranged in the protective shell 4 drives the driving gear 61 to rotate, the driving gear 61 meshes with the driven gear 62 to rotate, and then drives the screw rod 63 to rotate, the sliding groove matched with the limiting block 65 is arranged on the outer surface of the threaded pipe 64, so that the threaded pipe 64 connected with the screw rod 63 can move vertically when the screw rod 63 rotates, and the valve core 66 and the fixed core 67 are separated when the threaded pipe 64 moves, at this time, the medium can flow through the inside of the valve body 1, and when the medium passes through the inside of the buffer pipe 3, the flow cavity 33 is arranged on the fixed plate 32, under the action of the medium pressure, the flow cavity 33 can drive the limiting flow plate 35 to move horizontally, at this time, the limiting flow plate 35 and the fixed plate 32 are separated, the flow of the flow cavity 33 is limited, so that the medium can flow through the flow cavity 33, when the medium flows, the filter screen plate 34 arranged can filter the impurities in the flowing medium, and the movement of the limiting flow plate 35 driven by the medium flow can drive the buffer spring 37 to compress, so as to realize the buffering effect, reduce the damage of the excessive impact force of the medium to the valve core 66, the bolt on the connecting piece 2 can be unscrewed, the connecting piece 2 can be disassembled, and the fixed cover 5 arranged can be disassembled from the protective shell 4.

[0033] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Cryogenic bellows stop valve comprising a valve body (1), characterized in that: The upper surface of the valve body (1) is fixed with a connecting piece (2) through bolts, the left side of the valve body (1) is provided with a buffer mechanism for buffering medium; The buffer mechanism comprises two buffer pipes (3), both of which are communicated at both ends of the valve body (1), the ends of the two buffer pipes (3) are fixed with flanges (31), the inside of one of the buffer pipes (3) is fixed with a fixed plate (32), the inside of the fixed plate (32) is provided with a flow cavity (33), the inside of the flow cavity (33) is fixed with a filter screen plate (34), the right side of the flow cavity (33) is provided with a flow limiting plate (35), the side wall of the flow limiting plate (35) is fixed with two movable rods (36) penetrating the inside of the fixed plate (32).

2. A cryogenic bellows stop valve according to claim 1, wherein: The outer surface of the movable rod (36) is sleeved with a buffer spring (37) abuttingly connected with the side wall of the fixed plate (32), the upper surface of the connecting piece (2) is fixed with a protective shell (4).

3. A cryogenic bellows stop valve according to claim 2, wherein: The upper surface of the protective shell (4) is fixed with a fixed cover (5) through bolts, the inside of the protective shell (4) is provided with a driving mechanism for opening and closing the stop valve.

4. A cryogenic bellows stop valve according to claim 3, wherein: The driving mechanism comprises a stepping motor (6) fixed in the inside of the protective shell (4) through bolts, the power output shaft of the stepping motor (6) is fixed with a driving gear (61).

5. A cryogenic bellows stop valve according to claim 4, wherein: One end of the driving gear (61) is engaged with a driven gear (62), the lower surface of the driven gear (62) is fixed with a lead screw (63).

6. A cryogenic bellows stop valve according to claim 5, wherein: The lower end of the lead screw (63) is threadedly connected with a threaded tube (64), the outer surface of the threaded tube (64) is slidingly connected with a limiting block (65) fixedly connected with the connecting piece (2).

7. A cryogenic bellows stop valve according to claim 6, wherein: The lower surface of the threaded tube (64) is fixed with a valve core (66), the lower surface of the valve core (66) is movably connected with a fixed core (67) fixedly connected with the valve body (1).

Images