An exhaust valve provided with an opening and closing pressure threshold

Abstract

The present invention discloses an exhaust valve provided with an opening and closing pressure threshold, which comprises a valve housing and a valve core. The valve housing includes a base and an upper cover. A downward limiting platform is provided at the lower part of the inner cavity of the base, and a vertical exhaust guiding pipe is provided inside the upper cover. An upward limiting platform is provided inside the exhaust guiding pipe. The valve core is a "convex"-shaped cavity structure with an open lower part. The "convex"-shaped cavity structure includes a large column section and a small column section, and a transition section is provided between the large column section and the small column section. The small column section is inserted into the exhaust guiding pipe. A damping sleeve is provided on the lower side of the upward limiting platform, and radial exhaust holes penetrating through the side wall of the exhaust guiding pipe are provided on the damping sleeve. At least one upper and lower through depression is provided on the side wall of the large column section of the valve core, and the depression and the inner cavity of the base form channels for the gas to move up and down. A leakage hole is provided on the transition section of the valve core, and a two-way check valve is provided on the leakage hole. The present invention can make the valve open and close powerfully and in place, and eliminate the influence of scale and rust on the movement of the valve core.

Description

Technical Field

[0001] The present invention relates to the technical field of water supply engineering, and particularly to an exhaust valve provided with opening and closing pressure thresholds. Background Art

[0002] The exhaust valve is installed at various high points on the pipeline and is responsible for inflating the pipeline from the outside or exhausting gas from the pipeline to the outside. It is an important component to ensure the safe operation of the tap water pipe network. The exhaust valve realizes the opening and closing of the valve by the up and down movement of the valve core in the valve housing. After long-term use, the accumulation of scale and the growth of rust in the valve housing will hinder the movement of the valve core, and then cause the failure of the valve opening and closing function. Adding a certain external force to the movement of the valve core to keep a certain opening and closing stroke all the time can wear off the scale and rust that hinder the movement of the valve core, achieving the effect of "running water never goes bad, and a door-hinge never gets worm-eaten". However, the existing exhaust valve cores are floating balls or floating bowls with fixed weights. The gravity received by the floating ball or floating bowl is the opening force of the valve, and the difference between the buoyancy received by the floating ball or floating bowl and its gravity is the closing force of the valve. If the method of increasing the weight of the valve core is used to increase the opening force, the weight of the valve core will offset more buoyancy, resulting in insufficient closing force; if the method of reducing the weight of the valve core is used to increase the closing force, the weight of the valve core will be too light, resulting in insufficient opening force, and it is difficult to achieve both. Summary of the Invention

[0003] The present invention provides an exhaust valve provided with opening and closing pressure thresholds, which uses a damping sleeve to set a pressure threshold for the opening and closing of the valve, and uses a "convex"-shaped cavity structure to replace the floating ball or floating bowl in the existing valve. The "convex"-shaped cavity structure has the function of autonomously changing the weight during the opening and closing process of the valve, making the opening and closing of the exhaust valve equally powerful and in place, and eliminating the influence of scale and rust on the movement of the valve core.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] An exhaust valve with an opening and closing pressure threshold, comprising a valve housing and a valve core. The valve housing includes a base and an upper cover. The base and the upper cover are connected by threads. A gasket is provided between the base and the upper cover. A downward limit platform for preventing the valve core from sinking is provided at the lower part of the inner cavity of the base. A vertical exhaust guide pipe is provided inside the upper cover. An upward limit platform for preventing the valve core from floating is provided inside the exhaust guide pipe. The valve core is a "convex"-shaped cavity structure with an open lower part. The "convex"-shaped cavity structure includes a large column section at the lower side and a small column section at the upper side. A transition section is provided between the large column section and the small column section. The small column section is inserted into the exhaust guide pipe. A damping sleeve for providing sliding friction resistance to the small column section of the valve core moving up or down is provided below the upward limit platform. Radial exhaust holes penetrating the side wall of the exhaust guide pipe are provided on the damping sleeve. At least one depression penetrating up and down is provided on the side wall of the large column section of the valve core. A channel for gas to move up or down is formed between the depression and the inner cavity of the base. Leakage holes are provided on the transition section of the valve core. A two-way check valve is provided on the leakage holes.

[0006] Further, the two-way check valve is a double-headed cap or two diaphragms respectively located on the upper and lower sides of the transition section. The double-headed cap includes caps at both ends and a connecting rod connecting the two caps. The diameter of the connecting rod is at least 1 mm smaller than the diameter of the leakage hole.

[0007] Further, an axial sealing groove is provided on the upward limit platform, and an axial sealing ring is provided on the axial sealing groove.

[0008] Further, a support partition is provided at the lower end of the exhaust guide pipe, and a support plate ventilation hole is provided on the support partition.

[0009] The beneficial effects of the present invention are as follows:

[0010] 1. The damping sleeve on the exhaust guide pipe of the present invention provides sliding friction resistance to the valve core moving up and down, which is equivalent to setting a pressure threshold for opening and closing the valve. The sudden release of the pressure accumulated when opening and closing the valve makes the valve open and close quickly and in place, shortening the time for the valve to be impacted by water and gas when in the critical state of opening and closing.

[0011] 2. In the present invention, the weight of the valve core varies when the valve is opened and closed. When inflating from the outside to the pipeline, the water level in the pipeline drops. Under the action of its own weight and water flow, the two-way stop valve closes the air leakage holes on the transition section from the upper part of the transition section, forming a closed space within the "convex"-shaped cavity structure. According to common knowledge of vacuum, the stored water in this closed space cannot flow out. At this time, the weight of the valve core is equal to the sum of the weight of the "convex"-shaped cavity structure and the weight of the stored water inside it, increasing the power to open the exhaust valve and ensuring that the opening pressure breaks through the pressure threshold, thus opening the valve; when the water level is completely lower than the bottom surface of the "convex"-shaped cavity structure, the stored water in the "convex"-shaped cavity structure flows out, and the weight of the valve core is the weight of the "convex"-shaped cavity structure. During the valve closing process of the exhaust valve, the self-weight of the valve core is at its minimum, and the buoyancy of water acting on the valve core is offset very little, ensuring a strong valve closing force and the valve closing in place.

[0012] 3. The valve opens and closes with equal force and in place. The valve core rubs up and down repeatedly, which can inhibit the development of scale and rust, ensuring the normal use of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described in detail below with reference to the drawings and embodiments.

[0014] Figure 1 is the overall structure schematic diagram of the present invention;

[0015] Figure 2 is the structural detail schematic diagram of the present invention;

[0016] Figure 3 is the upper cover structure schematic diagram of the present invention;

[0017] Figure 4 is the structural schematic diagram of using a diaphragm as the valve core of the two-way stop valve;

[0018] Figure 5 is the structural schematic diagram of the double-headed sealing cap;

[0019] Figure 6 is the working state diagram of the present invention when inflating from the outside to the pipeline;

[0020] Figure 7 is the working state diagram of the present invention when exhausting from the pipeline to the outside.

[0021] In the figure: 1 base, 101 downward limit platform, 102 water inlet, 2 upper cover, 201 exhaust guide pipe, 201-1 upward limit platform, 201-1-1 axial seal groove, 201-2 radial exhaust hole, 202 support partition, 202-1 support plate ventilation hole, 203 dust cover, 204 valve exhaust hole, 3 valve core, 301 large column section, 301-1 depression, 302 small column section, 303 transition section, 303-1 air leakage hole, 4 damping sleeve, 5 two-way check valve, 501 sealing cap, 502 connecting rod, 6 axial sealing ring, 7 liquid level outside the valve core, 8 liquid level inside the valve core, 9 diaphragm. Specific implementation manner

[0022] An exhaust valve with an opening and closing pressure threshold, the overall structure is shown in Figure 1 , Figure 2 As shown. The exhaust valve includes a valve housing and a valve core. The valve housing includes a base 1 and an upper cover 2. The base 1 and the upper cover 2 are connected by threads, and a gasket is provided between the base 1 and the upper cover 2. The lower part of the base 1 is provided with a flange for connecting to a tap water pipe, and a water inlet is provided in the middle of the flange. A downward limit platform 101 for blocking the valve core 3 from sinking is provided in the lower part of the inner cavity of the base 1. The structure of the upper cover 2 is shown in Figure 3 As shown. A vertical exhaust guide pipe 201 is provided inside the upper cover 2, and an upward limit platform 201-1 for blocking the valve core 3 from floating is provided 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 provided above the valve exhaust hole 204. A support partition 202 is provided at the lower part of the exhaust guide pipe 201, and a support plate ventilation hole 202-1 is provided on the support partition 202. The valve core 3 is a "convex"-shaped cavity structure with an open lower part. The "convex"-shaped cavity structure includes 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 provided 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. In this embodiment, a gap not greater than 2 mm is provided between the small column section 302 and the exhaust guide pipe 201. The valve core 3 reciprocates up and down between the downward limit platform 101 and the upward limit platform 201-1. A damping sleeve 4 for providing sliding friction resistance for the small column section 302 of the valve core moving up or down is provided on the lower side of the upward limit platform 201-1. In this embodiment, the damping sleeve 4 is made of 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 one-half of the sum of the weight of the "convex"-shaped cavity structure and the weight of the maximum water storage in the large column section 301. A radial exhaust hole 201-2 penetrating the side wall of the exhaust guide pipe 201 is provided on the damping sleeve 4. At least one vertically penetrating depression 301-1 is provided on the side wall of the large column section 301 of the valve core, and a channel for gas to go up or down is formed between the depression 301-1 and the inner cavity of the base 1. An air leakage hole 303-1 is provided on the transition section 303 of the valve core, and a two-way check valve 5 is provided on the air leakage hole 303-1. The two-way check valve 5 is a double-headed sealing cap or two diaphragms respectively located on the upper and lower sides of the transition section 303, as shown inFigure 4 , Figure 5 As shown in Figure 5 , the double-headed sealing cap includes sealing caps 501 at both ends and a connecting rod 502 connecting the two sealing caps. The diameter of the connecting rod 502 is at least 1 mm less than the diameter of the air leakage hole 303-1. A diaphragm is used as a two-way check valve. The diaphragm 9 has an area that can cover the air leakage hole 303-1. The two diaphragms are connected by a flexible wire, which is equivalent to an enlarged double-headed sealing cap. An axial sealing groove 201-1-1 is provided on the bottom surface of the upward limit platform 201-1, and an axial sealing ring 6 is provided on the axial sealing groove 201-1-1.

[0023] The working process of the present invention when inflating from the outside to the pipeline is shown in Figure 6 As shown in Figure 6 , first, the liquid level 7 outside the valve core continuously drops, and the stored water in the large column section 301 of the valve core 3 has a tendency to flow out downward. At this time, the upper sealing cap 501 of the two-way check valve 5 moves downward with the water flow and seals the air leakage hole 303-1 on the transition section 303 of the valve core, forming a closed space inside the "convex"-shaped cavity structure of the valve core. According to the common sense of vacuum, as long as the liquid level 7 outside the valve core is not lower than the bottom of the "convex"-shaped cavity structure, the stored water in the valve core will not flow out. The weight of the "convex"-shaped cavity structure plus the weight of the part of the stored water inside the valve core and higher than the liquid level 7 outside the valve core is the driving force for opening the valve. As the liquid level 7 outside the valve core continuously decreases, the height difference between the liquid level 8 inside the valve core and the liquid level 7 outside the valve core becomes larger and larger, and the valve opening driving force continuously increases. Until the valve opening driving force accumulates to be greater than the frictional resistance between the damping sleeve 4 and the small column section 302 of the valve core, the valve core 3 breaks through the resistance and quickly sinks until the large column section 301 of the valve core is intercepted by the downward limit platform 101 at the lower part of the inner cavity of the base 1, that is, the valve core is opened in place. The outside air sequentially passes through the valve exhaust hole 204, the radial exhaust hole 201-2, and the support plate ventilation hole 202-1 and enters the inside of the base 1, and enters the tap water pipeline along the channel formed between the depression 301-1 on the side wall of the large column section of the valve core and the inner cavity of the base 1 for gas to go up or down.

[0024] Exhausting from the pipeline to the outside, as shown in Figure 7As shown in the figure, the water flow drives the air in the pipeline into the exhaust valve, and there are two air discharge routes. The first route is that the air passes through the channels for the gas to go up or down between the depression 301-1 and the inner cavity of the base 1, the vent hole 202-1 of the support plate, the radial exhaust hole 201-2, and the valve exhaust hole 204 in sequence. The second route is that the air entering the inside of the valve core from the open bottom of the "convex"-shaped cavity structure passes through the air leakage hole 303-1, the vent hole 202-1 of the support plate, the radial exhaust hole 201-2, and the valve exhaust hole 204 in sequence. Since there are air paths both inside and outside the valve core, after the water passes through the water inlet 102 until the water level rises to the transition section 303, the water levels inside and outside the valve core are the same. When the water surface touches the lower sealing cap 501 of the two-way stop valve 5, the water gushes upward from the gap between the air leakage hole 303-1 and the connecting rod 502. The water flow drives the two-way stop valve 5 to move upward, and the lower sealing cap of the two-way stop valve 5 closes the air leakage hole 303-1 from the lower side of the transition section 303. At this time, a closed space is formed inside the "convex"-shaped cavity structure serving as the valve core, the liquid level 7 outside the valve core gradually rises higher than the liquid level 8 inside the valve core, and the buoyancy force on the valve core gradually increases. The whole valve core rises, and the small column section 302 contacts the damping sleeve 4, and the frictional force between the two prevents the valve core from moving upward. When the difference between the buoyancy force and the weight of the "convex"-shaped cavity structure is greater than the frictional resistance between the small column section 302 and the damping sleeve 4, the valve core quickly moves upward, the side wall of the small column section 302 blocks the radial exhaust hole 201-2, and the top surface blocks the exhaust port 204, cutting off the water gushing-out channel. It should be noted that the inside of the small column section 302 is a closed space, and the water pressure has a compression effect on the air in this space. After the upward driving force of the valve core breaks through the pressure threshold, the inside of the small column section 302 is equivalent to an air spring, making the upward movement of the valve core more violent, the valve closing action faster, and shortening the impact of water and air on the valve in the critical state of valve closing. The valve opening and closing are equally forceful, and the opening and closing are in place. The valve core rubs up and down repeatedly, which can inhibit the development of scale and rust around the valve core and ensure the normal use of the valve.

Claims

1. An exhaust valve with an opening and closing pressure threshold, comprising a valve housing and a valve core. The valve housing includes a base (1) and an upper cover (2). The base (1) and the upper cover (2) are connected by threads, and a gasket is provided between the base (1) and the upper cover (2). It is characterized in that, The lower part of the inner cavity of the base (1) is provided with a downward limit platform (101) that blocks the downward sinking of the valve core (3). Inside the upper cover (2), there is a vertical exhaust guide pipe (201). Inside the exhaust guide pipe (201), there is an upward limit platform (201-1) that blocks the upward floating of the valve core (3). The valve core (3) has a "convex"-shaped cavity structure with an open lower part. The "convex"-shaped cavity structure includes a large column section (301) on the lower side and a small column section (302) on the upper side. A transition section (303) is provided 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). A damping sleeve (4) is provided below the upward limit platform (201-1) to provide sliding frictional resistance for the small column section (302) of the valve core that moves up or down. The damping sleeve (4) is provided with radial exhaust holes (201-2) that penetrate the side wall of the exhaust guide pipe (201). At least one depression (301-1) that runs through up and down is provided on the side wall of the large column section (301) of the valve core. A channel for gas to flow up or down is formed between the depression (301-1) and the inner cavity of the base (1). A leakage hole (303-1) is provided on the transition section (303) of the valve core. A two-way check valve (5) is provided on the leakage hole (303-1). The two-way check valve (5) is a double-headed cap or two diaphragms respectively located on the upper and lower sides of the transition section (303). The double-headed cap includes caps (501) at both ends and a connecting rod (502) that connects the two caps. The diameter of the connecting rod (502) is at least 1 mm less than the diameter of the leakage hole (303-1). A support partition (202) is provided at the lower end of the exhaust guide pipe (201). The support partition (202) is provided with support partition ventilation holes (202-1).

2. The exhaust valve according to claim 1, characterized in that, An axial seal groove (201-1-1) is provided on the upward limit platform (201-1). An axial sealing ring (6) is provided in the axial seal groove (201-1-1).

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