CN220286548U

CN220286548U - Exhaust valve with opening and closing pressure threshold

Info

Publication number: CN220286548U
Application number: CN202321587617.9U
Authority: CN
Inventors: 祁超
Original assignee: Beijing Third Branch Co Of National Investment Property Co ltd
Current assignee: Beijing Third Branch Co Of National Investment Property Co ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2024-01-02
Anticipated expiration: 2033-06-21

Abstract

The utility model discloses an exhaust valve with an opening and closing pressure threshold value, which comprises a valve shell and a valve core, wherein the valve shell comprises a base and an upper cover. The lower part of the inner cavity of the base is provided with a downlink limiting table, a vertical exhaust guide pipe is arranged in the upper cover, and an uplink limiting table is arranged in the exhaust guide pipe. The valve core is of a 'convex' shaped cavity structure with an open lower part, the 'convex' shaped cavity structure comprises a big column section and a small column section, a transition section is arranged between the big column section and the small column section, and the small column section is inserted into the exhaust guide pipe. The damping sleeve is arranged at the lower side of the uplink limiting table, and the radial exhaust hole penetrating through the side wall of the exhaust guide pipe is arranged on the damping sleeve. The side wall of the large column section of the valve core is provided with at least one through pit which is communicated up and down, the pit and the inner cavity of the base form an upward and downward gas channel, the transition section of the valve core is provided with a leakage hole, and the leakage hole is provided with a two-way stop valve. The utility model can make the valve switch powerful and switch in place, and eliminate the influence of scale and rust on the action of the valve core.

Description

Exhaust valve with opening and closing pressure threshold

Technical Field

The utility model relates to the technical field of water supply engineering, in particular to an exhaust valve with an opening and closing pressure threshold value.

Background

The exhaust valve is arranged at each high point position on the pipeline, and is an important part for guaranteeing the safe operation of the tap water pipe network, and the exhaust valve is responsible for the task of inflating the pipeline from the outside or exhausting the gas from the inside of the pipeline to the outside. The exhaust valve realizes the opening and closing of the valve through the up-and-down movement of the valve core in the valve shell, and after long-time use, scale accumulation and rust growth in the valve shell can cause obstruction to the movement of the valve core, thereby leading to failure of the opening and closing functions of the valve. And a certain external force is added to the movement of the valve core, so that the valve core always keeps a certain opening and closing stroke, scale and rust which obstruct the movement of the valve core can be rubbed off, and the effects of no corrosion of running water and no moth of house pivot are achieved. However, the valve core of the existing exhaust valve is a floating ball or a floating bowl with fixed weight, the gravity born by the floating ball or the floating bowl is valve opening power, the difference between the buoyancy born by the floating ball or the floating bowl and the gravity born by the floating ball or the floating bowl is valve closing power, and if the valve opening power is improved by a method of increasing the weight of the valve core, more buoyancy can be counteracted by the weight of the valve core, so that the valve closing power is insufficient; if the valve closing power is improved by adopting a method for reducing the weight of the valve core, the valve core is too light in weight, so that the valve opening power is insufficient, and the best two effects are difficult to achieve.

Disclosure of Invention

The utility model provides an exhaust valve with an opening and closing pressure threshold, which utilizes a damping sleeve to set the pressure threshold for valve opening and closing, utilizes a convex-shaped cavity structure to replace a floating ball or a floating bowl in the existing valve, and has the function of automatically changing weight in the valve opening and closing process, so that the exhaust valve is opened and closed forcefully, and the valve is opened and closed in place, thereby eliminating the influence of scale and rust on the action of a valve core.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides an exhaust valve with switching pressure threshold, includes valve casing, case, the valve casing includes base, upper cover, base, upper cover pass through threaded connection, be equipped with sealed pad between base, the upper cover, the inner chamber lower part of base is equipped with the descending limit table that blocks the case and sink, the inside vertical exhaust guide tube that is equipped with of upper cover, be equipped with the ascending limit table that blocks the case come-up in the exhaust guide tube, the case is the open "protruding" font cavity structure in lower part, the "protruding" font cavity structure includes big post section, the little post section of downside, be equipped with the changeover portion between big post section and the little post section, little post section alternates in the exhaust guide tube, ascending limit table downside is equipped with the case little post section that is for ascending or descending motion and provides sliding friction resistance's damping cover, be equipped with the radial exhaust hole that runs through the exhaust guide tube lateral wall on the damping cover, be equipped with the recess that link up at least from top to bottom on the lateral wall of case big post section, constitute gaseous ascending or descending between concave and the base inner chamber, be equipped with the changeover portion and leak vent, be equipped with the case and leak vent.

The scheme is further, two diaphragm that two-way stop valve is double-end and seals and emit or be located the changeover portion upper and lower both sides respectively, double-end seals and emits including being located the sealing that both ends emit and connect two connecting rods that seal emit, the diameter of connecting rod is less than gas leakage hole diameter 1 millimeter at least.

The scheme is further that an axial sealing groove is arranged on the uplink limiting table, and an axial sealing ring is arranged on the axial sealing groove.

The scheme is further that the lower end of the exhaust guide pipe is provided with a supporting partition board, and the supporting partition board is provided with a supporting board vent hole.

The beneficial effects of the utility model are as follows:

1. the damping sleeve on the exhaust guide pipe provides sliding friction resistance for the valve core moving up and down, which is equivalent to setting a pressure threshold for opening and closing the valve, and the sudden release of the pressure of the opening and closing valve after accumulation enables the valve to be opened and closed quickly and in place, so that the time of water and gas impact of the valve in the critical state of opening and closing is shortened.

2. When the valve is opened and closed, the weight of the valve core is variable, when the valve is inflated from the outside to the inside of the pipeline, the water level in the pipeline is reduced, the bidirectional stop valve seals the air leakage hole on the transition section from the upper part of the transition section under the action of dead weight and water flow, so that a sealed space is formed in the 'convex' cavity structure, and according to a vacuum common sense, water in the sealed space cannot flow out, at the moment, the weight of the valve core is equal to the sum of the weight of the 'convex' cavity structure and the weight of the water in the valve core, the power for opening the exhaust valve is increased, the pressure of the opening valve is ensured to break through the pressure threshold value, and the valve is opened; when the water level is completely lower than the bottom surface of the convex-shaped cavity structure, water stored in the convex-shaped cavity structure flows out, the weight of the valve core is the weight of the convex-shaped cavity structure, the weight of the valve core is minimum in the valve closing process of the exhaust valve, the buoyancy of the water counteracted to the valve core is little, the valve closing force is ensured, and the valve closing is in place.

3. The valve is also forceful to open and close, and the valve core is repeatedly rubbed up and down when the valve is opened and closed, so that the development of scale and rust can be inhibited, and the normal use of the valve is ensured.

Drawings

The utility model is described in detail below with reference to the drawings and examples.

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of the structural details of the present utility model;

FIG. 3 is a schematic view of the structure of the upper cover of the present utility model;

FIG. 4 is a schematic illustration of a valve cartridge configuration using a diaphragm as a bi-directional shut-off valve;

FIG. 5 is a schematic diagram of a dual-headed tamper evident structure;

FIG. 6 is a view of the utility model in operation when the pipe is inflated from the outside;

fig. 7 is a view showing an operation state when the pipe is exhausted to the outside.

In the figure: 1 base, 101 descending limit table, 102 water inlet, 2 upper cover, 201 exhaust guide pipe, 201-1 ascending limit table, 201-1-1 axial seal groove, 201-2 radial exhaust hole, 202 supporting partition, 202-1 supporting plate vent hole, 203 dust cover, 204 valve exhaust hole, 3 valve core, 301 big column section, 301-1 concave, 302 small column section, 303 transition section, 303-1 leakage hole, 4 damping sleeve, 5 bidirectional stop valve, 501 seal cap, 502 connecting rod, 6 axial seal ring, 7 valve core outer liquid level, 8 valve core inner liquid level, 9 membrane.

Detailed Description

An exhaust valve with an opening and closing pressure threshold is shown in fig. 1 and 2, and the overall structure of the exhaust valve comprises a valve shell and a valve core. The valve casing includes base 1, upper cover 2, and base 1, upper cover 2 pass through threaded connection, are equipped with sealed the pad between base 1, the upper cover 2. The lower part of the base 1 is provided with a flange connected with a tap water pipeline, and the middle part of the flange is provided with a water inlet. The lower part of the inner cavity of the base 1 is provided with a descending limiting table 101 for preventing the valve core 3 from sinking. The structure of the upper cover 2 is shown in fig. 3, a vertical exhaust guide pipe 201 is arranged in the upper cover 2, and an upward limit table 201-1 for preventing the valve core 3 from floating upward is arranged in the exhaust guide pipe 201. The upper opening of the exhaust guide pipe 201 is a valve exhaust hole 204, and a dust cover 205 is arranged above the valve exhaust hole 204. The lower part of the exhaust guide pipe 201 is provided with a supporting partition plate 202, and the supporting partition plate 202 is provided with a supporting plate vent hole 202-1. The valve core 3 is of a convex cavity structure with an open lower part. The convex-shaped cavity structure comprises a large column section 301 at the lower side and a small column section 302 at the upper side, and a transition section 303 is arranged between the large column section 301 and the small column section 302. The small column section 302 is inserted into the exhaust guide pipe 201, and in this embodiment, a gap of not more than two millimeters is provided between the small column section 302 and the exhaust guide pipe 201. The valve core 3 reciprocates up and down between the down limit table 101 and the up limit table 201-1. The lower side of the ascending limiting table 201-1 is provided with a damping sleeve 4 for providing sliding friction resistance for the small column section 302 of the valve core which moves up or down, in this embodiment, the damping sleeve 4 adopts a wear-resistant nitrile rubber ring, and the sliding friction resistance between the small column section 302 and the damping sleeve 4 is set to be half of the sum of the weight of the 'convex' cavity structure and the maximum water storage weight in the large column section 301. The damping sleeve 4 is provided with radial exhaust holes 201-2 penetrating through the side wall of the exhaust guide pipe 201. At least one through-up-down concave 301-1 is arranged on the side wall of the valve core large column section 301, and a gas ascending or descending channel is formed between the concave 301-1 and the inner cavity of the base 1. The valve core transition section 303 is provided with a leakage hole 303-1, and the leakage hole 303-1 is provided with a two-way stop valve 5. The two-way stop valve 5 is a double-ended cap or two diaphragms respectively positioned on the upper side and the lower side of the transition section 303, as shown in fig. 4 and 5, the double-ended cap comprises caps 501 positioned at two ends and a connecting rod 502 connecting the two caps, and the diameter of the connecting rod 502 is at least 1 millimeter smaller than the diameter of the air leakage hole 303-1. The diaphragm 9 has an area capable of covering the leakage hole 303-1, and the two diaphragms are connected by a flexible wire, which is equivalent to an enlarged double-head cap. An axial sealing groove 201-1-1 is arranged on the bottom surface of the uplink limiting table 201-1, and an axial sealing ring 6 is arranged on the axial sealing groove 201-1-1.

In the working process of the utility model when the pipeline is inflated from the outside, as shown in fig. 6, firstly, the outer liquid level 7 of the valve core continuously descends, and the water stored in the large column section 301 of the valve core 3 has a tendency of flowing down. At this time, the upper cap 501 of the two-way stop valve 5 moves down with the water flow and seals the leakage hole 303-1 on the valve core transition section 303, a closed space is formed inside the convex cavity structure forming the valve core, and according to the vacuum common sense, as long as the valve core outer liquid level 7 is not lower than the bottom of the convex cavity structure, the water stored in the valve core cannot flow out, and the weight of the convex cavity structure plus the weight of the water stored in the valve core and higher than the valve core outer liquid level 7 is the power for opening the valve. As the valve core outer liquid level 7 continuously decreases, the height difference between the valve core inner liquid level 8 and the valve core outer liquid level 7 is larger and larger, the valve opening power is continuously increased until the valve opening power is increased to be larger than the friction resistance between the damping sleeve 4 and the small column section 302 of the valve core, the valve core 3 breaks through resistance to sink rapidly until the large column section 301 of the valve core is blocked by the descending limiting table 101 positioned at the lower part of the inner cavity of the base 1, namely, the valve core is opened in place. Outside air sequentially enters the base 1 through the valve vent hole 204, the radial vent hole 201-2 and the support plate vent hole 202-1, and enters a tap water pipeline along a gas ascending or descending channel formed between the recess 301-1 on the side wall of the large column section of the valve core and the inner cavity of the base 1.

The air in the pipeline is exhausted from the outside, as shown in fig. 7, the water flow drives the air in the pipeline to enter the exhaust valve, the air exhaust route is two, and the first air exhaust route is a channel for the air to go up or go down between the concave 301-1 and the inner cavity of the base 1, the supporting plate vent hole 202-1, the radial vent hole 201-2 and the valve vent hole 204 in sequence; the second is that air entering the valve core from the bottom of the opening of the 'convex' cavity structure passes through the leakage hole 303-1, the supporting plate ventilation hole 202-1, the radial exhaust hole 201-2 and the valve exhaust hole 204 in sequence. Because the air paths are arranged inside and outside the valve core, after water passes through the water inlet 102, the water levels inside and outside the valve core are the same until the water level rises to the transition section 303, when the water level contacts the lower seal 501 of the bidirectional stop valve 5, water is sprayed upwards from the gap between the air leakage hole 303-1 and the connecting rod 502, the water drives the bidirectional stop valve 5 to move upwards, the lower seal of the bidirectional stop valve 5 seals the air leakage hole 303-1 from the lower side of the transition section 303, at the moment, a sealed space is formed inside a convex-shaped cavity structure serving as the valve core, the outer liquid level 7 of the valve core is gradually higher than the inner liquid level 8 of the valve core, the buoyancy of the valve core is gradually increased, the valve core integrally rises, the small column section 302 is contacted with the damping sleeve 4, and the friction force between the two prevents the valve core from moving upwards. When the difference between the buoyancy and the weight of the convex-shaped cavity structure is larger than the friction resistance between the small column section 302 and the damping sleeve 4, the valve core rapidly moves upwards, the radial vent hole 201-2 is blocked by the side wall of the small column section 302, the vent hole 204 is blocked by the top surface, and the water outward flushing channel is cut off. It should be noted that the interior of the small column section 302 is a closed space, the water pressure has a compression effect on the air in the space, and after the valve core moves upwards to break through the pressure threshold, the interior of the small column section 302 is equivalent to an air spring, so that the valve core moves upwards more violently, the valve closing action is quicker, and the impact of water and air on the valve is shortened when the valve closing critical state is reached. The valve is also forceful to open and close, and the valve core is repeatedly rubbed up and down, so that the development of scale and rust around the valve core can be inhibited, and the normal use of the valve is ensured.

Claims

1. The utility model provides an exhaust valve with switching pressure threshold, includes valve casing, case, the valve casing includes base (1), upper cover (2), base (1), upper cover (2) pass through threaded connection, be equipped with sealed pad between base (1), upper cover (2), characterized in that, the inner chamber lower part of base (1) is equipped with down spacing platform (101) that blocks case (3) subsidence, upper cover (2) inside is equipped with vertical exhaust guide tube (201), be equipped with the ascending spacing platform (201-1) that blocks case (3) come up in exhaust guide tube (201), case (3) are the open "protruding" font cavity structure in lower part, protruding "font cavity structure includes big post section (301) of downside, little post section (302) of upside, be equipped with changeover portion (303) between big post section (301) and little post section (302), little post section (302) alternate in exhaust guide tube (201), upward spacing platform (201-1) downside is equipped with and blocks ascending spacing platform (201-1) ascending upward and is equipped with the resistance (201) of little post section (201) of downhill side and is equipped with damping sleeve (4) of sliding motion (201) for downhill side, the resistance is equipped with damping sleeve (4), the side wall of the valve core large column section (301) is provided with at least one through recess (301-1) from top to bottom, a gas ascending or descending channel is formed between the recess (301-1) and the inner cavity of the base (1), the valve core transition section (303) is provided with a leakage hole (303-1), and the leakage hole (303-1) is provided with a two-way stop valve (5).

2. The exhaust valve according to claim 1, characterized in that the two-way shut-off valve (5) is a double-ended cap or two diaphragms located on the upper and lower sides of the transition section (303), respectively, the double-ended cap comprises caps (501) located on both ends and a connecting rod (502) connecting the two caps, and the diameter of the connecting rod (502) is at least 1 mm smaller than the diameter of the leakage hole (303-1).

3. The exhaust valve according to claim 1, characterized in that an axial sealing groove (201-1-1) is arranged on the uplink limiting table (201-1), and an axial sealing ring (6) is arranged on the axial sealing groove (201-1-1).

4. The exhaust valve according to claim 1, characterized in that a supporting partition plate (202) is arranged at the lower end of the exhaust guide pipe (201), and a supporting plate vent hole (202-1) is arranged on the supporting partition plate (202).