Air leakage prevention type stop valve

Abstract

The utility model provides an air leakage prevention type stop valve which comprises a hand wheel and a limiting piece, a rotating shaft used for transmitting power is arranged in the middle of the interior of the hand wheel, a set of locking nuts used for limiting are arranged at the upper end of the rotating shaft, a set of limiting discs used for limiting are arranged at the lower end of the hand wheel, and the limiting pieces are arranged on the hand wheel. The lower ends of the left side and the right side of the limiting disc are each provided with a set of supporting rods, the lower ends of the two sets of supporting rods are provided with sealing flange plates used for connection, and the lower end of the rotating shaft is provided with a set of threaded columns. The utility model has the following beneficial effects: the threaded column can be downwards rotated and adjusted along the vertical direction by using the limiting clamping shaft and the limiting seat, and the sealing connection effect of the connecting flange I is improved by using the sealing flange plate and the sealing gasket; the external inflow end and the external flow guide end are rapidly connected in a sealed mode through the second connecting flange and the third connecting flange, and the through-flow effect of the second connecting flange and the third connecting flange is controlled through the valve element.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves and relates to an air leakage-proof stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. When the valve is closed, pressure needs to be applied to the valve disc to prevent leakage on the sealing surface. Its opening and closing parts are plug-shaped valve discs, and the sealing surface is a flat surface or a sea cone surface. The valve disc moves linearly along the center line of the valve seat. When the medium enters the valve from under the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. Therefore, the force to close the valve is greater than the force to open the valve, and the diameter of the valve stem needs to be designed to be relatively large to prevent the valve stem from bending and causing air leakage. However, if the stop valve cannot effectively prevent air leakage during use, a series of problems may occur.

[0003] A leaky stop valve means that fluid in the system is constantly leaking. This not only results in a waste of energy, but can also increase operating costs because the leaking fluid needs to be constantly replenished. For systems that rely on precise fluid flow, a leaky stop valve can cause system performance to deteriorate. For example, in an air conditioning system, if the stop valve leaks, it can cause a reduction in cooling effect and affect the stability of indoor temperature.

[0004] Long-term leakage may cause damage to other parts of the equipment. For example, the leaking fluid may corrode the surrounding metal parts, or cause pressure and temperature fluctuations inside the equipment, thereby damaging sensitive components. For some systems using high-pressure or flammable and explosive fluids, the leakage of the stop valve may pose a serious safety hazard. The leaking fluid may cause a fire or explosion, posing a huge threat to personnel and equipment.

[0005] In summary, it is a serious problem that the stop valve cannot prevent air leakage during use. It not only affects the performance and efficiency of the system, but may also have a serious impact on the equipment, environment and personnel safety. Therefore, there is an urgent need for an anti-leakage stop valve to solve the above problems. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model aims to provide an air leakage-proof stop valve to solve the problems raised in the above-mentioned background technology.

[0007] The utility model is realized by the following technical scheme: an anti-leakage stop valve, comprising: a hand wheel and a limit plate, wherein a rotating shaft for transmitting power is provided in the middle position inside the hand wheel;

[0008] A group of locking nuts for limiting function are arranged at the upper end of the rotating shaft, a group of limiting plates for limiting function are arranged at the lower end of the hand wheel, and a group of supporting rods are arranged at the lower ends of the left and right sides of the limiting plates;

[0009] The lower ends of the two groups of support rods are provided with sealing flanges for connection, the lower end of the rotating shaft is provided with a group of threaded columns, a group of limit clamping shafts are provided on the outer side of the middle position of the threaded columns, and a group of limit seats are provided at the lower end of the limit clamping shafts. The threaded columns can be rotated downward in the vertical direction by using the limit clamping shafts and the limit seats.

[0010] As a preferred embodiment, a group of adjusting shafts are provided inside the limit seat, the adjusting shaft and the threaded column are an integrated structure, the lower end of the adjusting shaft is provided with a valve core for cutting off the valve body, the lower end of the valve core is provided with a limiting plate for limiting, a valve shell is provided on the outside of the valve core, a connecting flange three for guiding flow is provided at the lower end of the valve shell, and a connecting flange two for inlet flow is provided on the left side of the valve shell.

[0011] As a preferred embodiment, the connecting flange 1 and the sealing flange are connected and fixed by several groups of fixing bolts, the sealing flange and the connecting flange 1 are provided with sealing gaskets inside, and the sealing flange is provided with a mounting groove in the middle, so that the sealing connection effect of the connecting flange 1 can be improved by using the sealing flange and the sealing gasket.

[0012] As a preferred embodiment, the interior of the installation groove is sealed and connected to the limit seat, the limit seat and the limit clamping shaft are an integrated structure, the interior of the limit seat and the limit clamping shaft are both provided with internal screw grooves, and the interior of the internal screw grooves is provided with a sealant layer.

[0013] As a preferred embodiment, the connecting flange one, the connecting flange two and the connecting flange three have the same specifications, the connecting flange two is sealedly connected to the external flow inlet end by means of a flange, and the connecting flange three is sealedly connected to the external flow guide end by means of a flange. The external flow inlet end and the external flow guide end can be quickly sealed and connected by using the connecting flange two and the connecting flange three.

[0014] As a preferred embodiment, the interior of connecting flange two and the interior of connecting flange three are both interconnected with the interior of the valve housing, a valve cavity is provided inside the valve housing, the inner wall of the valve cavity is movably sealed and connected to the outer side of the valve core, and the flow effect of connecting flange two and connecting flange three can be controlled by using the valve core.

[0015] As a preferred embodiment, a limiting cavity is provided at the lower end of the valve cavity, the cross-sectional diameter length of the limiting cavity is greater than the cross-sectional diameter length of the valve core and is equal to the cross-sectional diameter length of the limiting plate, and a sealing ring is provided on the outer side of the limiting plate.

[0016] After adopting the above technical scheme, the beneficial effects of the utility model are: by using the limit clamp shaft and the limit seat to enable the threaded column to be rotated downward in the vertical direction, by using the sealing flange and the sealing gasket to improve the sealing connection effect of the connecting flange one, by using the connecting flange two and the connecting flange three to quickly seal the external inlet end and the external guide end, and by using the valve core to control the flow effect of the connecting flange two and the connecting flange three. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a left oblique front structural diagram of an anti-leakage stop valve of the utility model;

[0019] Figure 2 This is a schematic diagram of the front side top view of the valve core in an air leakage-proof stop valve of the utility model;

[0020] Figure 3 This is a front view structural diagram of the interior of a valve housing in an air leakage-proof stop valve of the utility model;

[0021] Figure 4 It is a schematic diagram of the left oblique rear view of the interior of the valve housing of an air leakage-proof stop valve of the utility model;

[0022] In the figure: 100-handwheel, 110-locking nut, 120-swivel shaft, 130-limiting plate, 140-support rod, 150-threaded column, 160-limiting clamping shaft, 170-limiting seat, 180-sealing flange, 190-fixing bolt, 200-connecting flange 1, 210-valve housing, 220-connecting flange 2, 230-connecting flange 3, 240-adjusting shaft, 250-valve core, 260-limiting plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 4, an anti-leakage stop valve, comprising: a hand wheel 100, a rotating shaft 120, a valve housing 210, a valve core 250 and a limit plate 260, wherein the rotating shaft 120 for transmitting power is provided in the middle position inside the hand wheel 100;

[0025] A set of locking nuts 110 for limiting function is disposed at the upper end of the rotating shaft 120, a set of limiting plates 130 for limiting function is disposed at the lower end of the hand wheel 100, and a set of supporting rods 140 are disposed at the lower ends of the left and right sides of the limiting plates 130;

[0026] A sealing flange 180 for connection is provided at the lower end of the two groups of support rods 140, a group of threaded columns 150 is provided at the lower end of the rotating shaft 120, a group of limit clamping shafts 160 is provided on the outer side of the middle position of the threaded columns 150, and a group of limit seats 170 is provided at the lower end of the limit clamping shafts 160. By using the limit clamping shafts 160 and the limit seats 170, the threaded columns 150 can be rotated downward in the vertical direction.

[0027] A group of adjusting shafts 240 are provided inside the limit seat 170. The adjusting shafts 240 and the threaded column 150 are an integrated structure. A valve core 250 is provided at the lower end of the adjusting shaft 240 for intercepting the flow of the valve body. A limiting plate 260 is provided at the lower end of the valve core 250 for limiting the flow. A valve shell 210 is provided on the outside of the valve core 250. A connecting flange three 230 for guiding flow is provided at the lower end of the valve shell 210. A connecting flange two 220 for inlet flow is provided on the left side of the valve shell 210.

[0028] The connecting flange 200 and the sealing flange 180 are connected and fixed by several groups of fixing bolts 190. Sealing gaskets are provided inside the sealing flange 180 and the connecting flange 200. A mounting groove is provided in the middle of the sealing flange 180. The sealing connection effect of the connecting flange 200 can be improved by using the sealing flange 180 and the sealing gasket.

[0029] See also Figure 1-Figure 4As the first embodiment of the utility model: In order to solve the problem that the leakage of the stop valve means that the fluid in the system is constantly leaking, which not only leads to a waste of energy, but also may increase operating costs, because the leaked fluid needs to be constantly replenished. For systems that rely on precise fluid flow, the leakage of the stop valve will cause the system performance to decline. First, the staff seals the external guide end with the connecting flange three 230 through several groups of bolts, and then seals the external inlet end with the connecting flange two 220 through several groups of bolts. Then, when the staff operates When opening the valve, the handwheel 100 is rotated, and the handwheel 100 drives the rotating shaft 120 to rotate, and the rotating shaft 120 drives the threaded column 150 to rotate. Since the interior of the limit seat 170 and the interior of the limit clamping shaft 160 are both provided with internal thread grooves, and the interior of the internal thread grooves are provided with a sealing rubber layer, the threaded column 150 drives the adjusting shaft 240 to drive the valve core 250 and the limit plate 260 to move downward during rotation, until the valve core 250 moves down to the lower end of the inner side of the connecting flange 220, and the interior of the connecting flange 220 and the interior of the connecting flange 3 230 are allowed to flow.

[0030] The interior of the installation groove is sealed with the limit seat 170 , the limit seat 170 and the limit clamping shaft 160 are an integrated structure, the limit seat 170 and the limit clamping shaft 160 are both provided with inner screw grooves, and the inner screw grooves are provided with a sealant layer.

[0031] The connecting flange 1 200, the connecting flange 2 220 and the connecting flange 3 230 have the same specifications. The connecting flange 2 220 is sealedly connected to the external flow inlet end by means of a flange, and the connecting flange 3 230 is sealedly connected to the external flow guide end by means of a flange. The external flow inlet end and the external flow guide end can be quickly sealed and connected by using the connecting flange 220 and the connecting flange 3 230.

[0032] The interior of connecting flange two 220 and the interior of connecting flange three 230 are both interconnected with the interior of the valve housing 210. A valve cavity is provided inside the valve housing 210. The inner wall of the valve cavity is movably sealed and connected to the outer side of the valve core 250. The flow effect of connecting flange two 220 and connecting flange three 230 can be controlled by using the valve core 250.

[0033] A limiting cavity is provided at the lower end of the valve cavity. The cross-sectional diameter of the limiting cavity is greater than the cross-sectional diameter of the valve core 250 and is equal to the cross-sectional diameter of the limiting plate 260. A sealing ring is provided on the outer side of the limiting plate 260.

[0034] See also Figure 1-Figure 4, as the second embodiment of the present utility model: based on the description in the above embodiments, further, since the interior of the connecting flange 220 and the interior of the connecting flange 3 230 are both interconnected with the interior of the valve housing 210, a valve cavity is provided inside the valve housing 210, and the inner wall of the valve cavity is movably sealed and connected to the outer side of the valve core 250. When the valve core 250 rotates downward, the valve core 250 always keeps in contact with the inner wall of the valve cavity until it moves to the inside of the limiting cavity. Since the cross-sectional diameter length of the limiting cavity is greater than the cross-sectional diameter length of the valve core 250 and is equal to the cross-sectional diameter length of the limiting plate 260, the fluid from the interior of the connecting flange 220 will be guided through the outer side of the valve core 250 to the interior of the connecting flange 3 230, thereby completing the flow, and the connecting ends of the valve housing 210 are all flange connections, which can effectively improve the connection strength and sealing effect.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air leakage-proof stop valve, comprising: A hand wheel (100), a rotating shaft (120), a connecting flange (200), a valve core (250) and a limit plate (260), characterized in that a rotating shaft (120) for transmitting power is provided in the middle of the hand wheel (100); A group of locking nuts (110) for limiting function are arranged at the upper end of the rotating shaft (120), a group of limiting plates (130) for limiting function are arranged at the lower end of the hand wheel (100), and a group of supporting rods (140) are arranged at the lower ends of the left and right sides of the limiting plates (130); The lower ends of the two groups of support rods (140) are provided with sealing flanges (180) for connection, the lower end of the rotating shaft (120) is provided with a group of threaded columns (150), a group of limiting clamping shafts (160) are provided on the outer side of the middle position of the threaded columns (150), and a group of limiting seats (170) are provided at the lower end of the limiting clamping shafts (160).

2. The anti-leakage stop valve according to claim 1, characterized in that: A set of adjusting shafts (240) is provided inside the limit seat (170), the adjusting shafts (240) and the threaded column (150) are an integrated structure, and a valve core (250) is provided at the lower end of the adjusting shaft (240) for the valve body to cut off flow; The lower end of the valve core (250) is provided with a limit plate (260) for limiting the position, the outer side of the valve core (250) is provided with a valve housing (210), the lower end of the valve housing (210) is provided with a connection flange three (230) for guiding the flow, the left side of the valve housing (210) is provided with a connection flange two (220) for inlet flow, and the upper end of the valve housing (210) is provided with a connection flange one (200).

3. The anti-leakage stop valve according to claim 2, characterized in that: The connecting flange 1 (200) and the sealing flange (180) are connected and fixed by a plurality of sets of fixing bolts (190); sealing gaskets are provided inside the sealing flange (180) and the connecting flange 1 (200); and a mounting groove is provided in the middle of the sealing flange (180).

4. The anti-leakage stop valve according to claim 3, characterized in that: The interior of the installation groove is sealedly connected to the limit seat (170), the limit seat (170) and the limit clamping shaft (160) are an integrated structure, the interior of the limit seat (170) and the interior of the limit clamping shaft (160) are both provided with internal screw grooves, and the interior of the internal screw grooves is provided with a sealing rubber layer.

5. The anti-leakage stop valve according to claim 3, characterized in that: The connection flange 1 (200), the connection flange 2 (220) and the connection flange 3 (230) have the same specifications. The connection flange 2 (220) is sealed and connected to the external inlet end by means of a flange, and the connection flange 3 (230) is sealed and connected to the external guide end by means of a flange.

6. The anti-leakage stop valve according to claim 5, characterized in that: The interior of the second connecting flange (220) and the interior of the third connecting flange (230) are both connected to the interior of the valve housing (210). A valve cavity is provided inside the valve housing (210), and the inner wall of the valve cavity is movably sealed to the outer side of the valve core (250).

7. The anti-leakage stop valve according to claim 6, characterized in that: A limiting cavity is provided at the lower end of the valve cavity, the cross-sectional diameter length of the limiting cavity is greater than the cross-sectional diameter length of the valve core (250), and is equal to the cross-sectional diameter length of the limiting plate (260), and a sealing ring is provided on the outer side of the limiting plate (260).

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