CN215980868U

CN215980868U - Slowly-closed type water hammer preventing air valve

Info

Publication number: CN215980868U
Application number: CN202121541818.6U
Authority: CN
Inventors: 李习洪; 詹小华; 梁碧华
Original assignee: WUHAN DAYU VALVE CO Ltd
Current assignee: WUHAN DAYU VALVE CO Ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2022-03-08
Anticipated expiration: 2031-07-07

Abstract

The utility model discloses a slowly-closed type water hammer preventing air valve which comprises a valve body and an upper cover body, wherein the upper cover body is covered above the valve body and is provided with an air inlet and exhaust channel, a flow limiting structure used for limiting the exhaust amount of air in a valve cavity is arranged in the upper cover body, a floating body is arranged in the valve body, a valve clack is correspondingly arranged above the floating body, a trace exhaust structure is arranged on the valve clack, and the trace exhaust structure can allow a small amount of pressurized air in the valve cavity to be exhausted outwards in a state that the valve clack is sealed. The utility model can realize micro-exhaust on the basis of satisfying the limited exhaust of gas in the valve cavity, and has compact structure, low manufacturing cost and wide application range.

Description

Slowly-closed type water hammer preventing air valve

Technical Field

The utility model relates to the technical field of pipeline valves, in particular to a slowly-closed type water hammer preventing air valve.

Background

The water hammer preventing air valve is one valve specially for water conservancy pipeline exhaust, and is used mainly in various water works, water supply engineering and city pipeline system to eliminate air inside the pipeline and prevent water hammer produced in the pipeline effectively. Most of waterproof hammer type air valves in the prior art only have the function of flow-limiting exhaust, cannot independently perform micro-exhaust, and also need to be combined with a micro-exhaust valve to perform micro-exhaust, so that the manufacturing cost is high, and the structure is complex.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a slowly-closed type water hammer air valve which can realize micro-exhaust on the basis of meeting the requirement of limited exhaust of gas in a valve cavity, and has the advantages of compact structure, low manufacturing cost and wide application range.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model provides a slowly-closed type water hammer preventing air valve which comprises a valve body and an upper cover body, wherein the upper cover body is covered above the valve body and is provided with an air inlet and exhaust channel, a flow limiting structure used for limiting the exhaust amount of air in a valve cavity is arranged in the upper cover body, a floating body is arranged in the valve body, a valve clack is correspondingly arranged above the floating body, a trace exhaust structure is arranged on the valve clack, and the trace exhaust structure can allow a small amount of pressurized air in the valve cavity to be exhausted outwards in a state that the valve clack is sealed.

Preferably, the current-limiting structure is including connecting in the upper cover body and being buffer and the support frame of arranging from top to bottom, and the through-hole has been seted up at the support frame middle part, and the break-in has the uide bushing in the through-hole, and the uide bushing top is connected with the guiding axle, and the epaxial cover of uide bushing is equipped with the current-limiting plate, and the current-limiting plate moves and supports to the buffer along the guiding axle under gaseous thrust effect to reduce the discharge of gaseous in the valve chamber.

Preferably, a guide rod is arranged above the valve clack, and the upper part of the guide rod extends into the guide sleeve to move up and down along the axial direction.

Preferably, the micro exhaust structure comprises an exhaust piece arranged at the top of the valve clack, and a micro exhaust hole communicated with the valve cavity and the air inlet and exhaust channel is formed in the exhaust piece; the top of the floating body is provided with a sealing gasket matched with the micro-exhaust hole and moves upwards under the buoyancy action of water to seal the micro-exhaust hole.

Preferably, the exhaust member is provided separately from the guide bar or integrally formed.

Preferably, a bearing disc for bearing the floating body is arranged in the valve body, a limiting column is arranged at the bottom of the floating body, and the limiting column penetrates out of the bearing disc and moves up and down along the axial direction.

Preferably, a plurality of guide ribs are arranged in the valve body.

Preferably, a sealing ring is clamped at a contact position between the upper cover body and the valve body, and the sealing ring extends along the radial inner side to form a sealing ring extending section which can be tightly attached to the valve clack.

Preferably, the joint surface between the extending section of the sealing ring and the valve clack is in a step-shaped arrangement.

Preferably, a protective net is arranged at the air outlet of the upper cover body.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

the utility model can realize micro-exhaust on the basis of satisfying the limited exhaust of gas in the valve cavity, and has compact structure, low manufacturing cost and wide application range.

Drawings

Fig. 1 is a schematic cross-sectional view of the present invention.

Fig. 2 is an enlarged schematic view of a structure at a in fig. 1.

Fig. 3 is a schematic view showing a state where the air valve of the slow-closure type water hammer exhausts a large amount of air.

Fig. 4 is a schematic view illustrating a state of the air valve of the slow-closure type waterproof hammer according to the present invention for limiting the flow of exhaust gas.

Fig. 5 is a schematic view illustrating a state after the air of the air valve of the slow-closure type waterproof hammer is exhausted.

Fig. 6 is a schematic view showing a state of micro air discharge of the air valve of the slow-closure type water hammer according to the present invention.

Fig. 7 is a partial view illustrating a slight amount of air discharged from the air valve of the slow-closure type water hammer according to the present invention.

Fig. 8 is a schematic view illustrating a state that the air valve of the slow-closure type water hammer is greatly supplemented with air.

Reference numerals: 1-a valve body; 2-a floating body; 3-a sealing gasket; 4-valve clack; 5-sealing ring; 6-valve cover; 7-a buffer; 8, a guide sleeve; 9-a flow limiting plate; 10-a guide shaft; 11-a support sleeve; 12-a protective net; 13-a gland; 14-micro vent hole; 15-a limiting column; 16-a receiving tray; 17-equal length stud; 18-cap nut; 19-a guide rib; 20-a guide bar; 21-a support frame; 22-a vent; 23-card slot.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Referring to fig. 1 and 2, a slowly-closed type water hammer-proof air valve includes a valve body 1, a floating body 2 disposed in the valve body 1, a valve flap 4 disposed above the floating body 2, and an upper cover body covering the upper side of the valve body 1; the upper cover body comprises a gland 13 and a valve cover 6 which are sequentially arranged from top to bottom, a flow limiting structure used for limiting the air discharge amount in the valve cavity is arranged in the upper cover body, and the flow limiting structure comprises a buffer body 7 and a support frame 21 which are connected to the upper cover body and are arranged up and down. The valve cover 6 is provided with a support frame 21, the middle part of the support frame 21 is provided with a through hole, a guide sleeve 8 is inserted in the through hole, a guide shaft 10 is connected with the upper part of the guide sleeve 8 in a threaded manner, the outer diameter of the guide shaft 10 is larger than the inner diameter of the through hole, a flow limiting plate 9 is sleeved on the guide shaft 10, and the flow limiting plate 9 can move upwards along the guide shaft 10 under the thrust action of gas and is abutted against the buffer body 7 so as to slow down the gas displacement of the valve cavity.

The valve clack 4 is provided with a trace exhaust structure which can allow a small amount of pressure gas in the valve cavity to be exhausted outwards in a sealing state of the valve clack. The micro exhaust structure comprises an exhaust piece 22 arranged at the top of the valve clack, the upper end and the lower end of the exhaust piece 22 respectively penetrate through the valve clack 4, and a micro exhaust hole for communicating the valve cavity with the air inlet and exhaust channel is formed in the exhaust piece 22; the top of the floating body 2 is provided with a sealing gasket 3 matched with the micro-exhaust hole, the sealing gasket 3 moves upwards under the buoyancy action of water to seal the micro-exhaust hole 14, the sealing gasket 3 is fixed through a clamping groove 23 fixedly arranged at the top of the floating body 2, and the top of the clamping groove 23 is hollowed to form a notch for embedding the sealing gasket 3. A guide rod 20 is arranged above the valve clack 4, the upper part of the guide rod 20 extends into the guide sleeve 8 and moves up and down along the axial direction, and the air exhaust piece 22 and the guide rod 20 are preferably integrally formed in the embodiment.

A bearing disc 16 for bearing the floating body 2 is arranged in the valve body 1, a limiting column 15 is arranged at the bottom of the floating body 2, and the limiting column 15 penetrates through the bearing disc 16 and can move up and down along the axial direction.

The gland 13 and the valve cover 6 are fixedly connected through an equal-length stud 17 and a cap-shaped nut 18, a protective net 12 is installed at an air outlet of the upper cover body, the top of the protective net 12 is connected with the gland 13, and the bottom of the protective net is connected with the buffer body 7; the top of the buffer body 7 extends inwards for a length to abut against the top of the upward moving restrictor plate 9. A supporting sleeve 11 is sleeved outside the equal-length stud 17, the top of the supporting sleeve 11 is contacted with the gland 13, and the bottom of the supporting sleeve 11 is contacted with the buffer body 7. The bottom of the valve cover 6 is provided with a sealing ring 5, the sealing ring 5 extends along the radial inner side to form a sealing ring extending section which can be tightly attached to the valve clack 4, the attaching surface of the sealing ring extending section and the valve clack 4 is in a step-shaped arrangement, and the sealing ring 5 is used for being in sealing contact with the valve clack 4, so that the sealing effect is improved.

In order to ensure that the floating body 2 does not deflect in the up-and-down movement process, 4 guide ribs 19 are arranged in the cavity of the valve body 1, and the 4 guide ribs have a guide function and can form the limit fit of the floating body 2 in the horizontal direction.

Referring to fig. 3-8, a working principle of the slow-closing type air valve for water hammer is as follows:

1. when the pipeline is normally filled with water, a large amount of air is discharged

When the pipeline is normally filled with water, the flow rate of the water filled in the pipeline is generally not more than 0.3-0.5m/s, the exhaust pressure difference is not more than 2-4KPa, the valve is fully opened, the air is rapidly exhausted at low pressure, and the air in the pipeline can be rapidly exhausted through the air inlet and exhaust channel, as shown in figure 3;

2. limited exhaust

When the water filling speed of the pipeline is too high or water columns in the pipeline are rapidly closed, and the exhaust pressure difference exceeds 15-30KPa, the flow limiting structure is put into operation, the flow limiting plate moves upwards along the guide shaft under the thrust action of strong pressure gas and abuts against the buffer body, and the exhaust area of the air inlet and exhaust channel of the slowly-closed type water hammer air valve is reduced; the air is discharged in a small amount through the flow limiting plate, so that the pressure fluctuation in the system is reduced, and the water hammer is effectively prevented from being generated, as shown in figure 4;

when the pipeline fills water, when the water filling speed can not be effectively controlled, the air in the pipeline is discharged at a high speed through the air valve, the water in the pipeline impacts the floating ball at a high speed to form larger impact pressure, and the air discharging speed can be effectively reduced through the flow limiting structure, so that the pressure fluctuation in the system is reduced, and the generation of a water filling water hammer is avoided.

3. After the water is filled, the exhaust port is automatically closed

When the water level in the valve cavity rises to a certain position, the floating body rises to the sealing surface, and the exhaust port is sealed by plugging, as shown in figure 5;

4. micro exhaust

When water in the pipeline is normally conveyed, a small amount of gas can continue to gather at the upper part of the valve cavity. When the gas is accumulated to a certain amount, the valve clack sealed with the slow-closing type water hammer preventing air valve cannot fall due to the existence of gas pressure in the valve cavity, but a floating body in the slow-closing type water hammer preventing air valve descends along with the reduction of the water level, a micro exhaust hole is opened, and the gas precipitated in the water is exhausted. In the process of gas discharging, the water level will gradually rise, the floating body moves upwards, the micro-vent hole is closed again, the gas discharging is stopped, and the circulation is continued, so that the air bag is not formed in the valve, as shown in fig. 6 and 7;

5. when negative pressure is generated, a large amount of air is fed

When reasons such as water delivery in-process water pump stop work, in the pipeline water of unloading, emergence accident explosion can produce the negative pressure in the pipeline, the big drill way is opened fast to the air valve under the negative pressure effect, through the quick tonifying qi of air valve, a large amount of air inhales the pipeline fast, and the pipeline is destroyed to the great negative pressure of formation has been avoided to balanced pipeline internal pressure difference, sees figure 8.

A full function air valve of the present invention can be easily manufactured or used by those skilled in the art according to the description of the present invention and the accompanying drawings, and can produce the positive effects of the present invention described herein.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides a slowly-closed type water hammer air valve which characterized in that: the slowly-closed type water hammer preventing air valve comprises a valve body (1) and an upper cover body, wherein the upper cover body is covered above the valve body (1) and is provided with an air inlet and exhaust channel, a flow limiting structure used for limiting the air exhaust amount in a valve cavity is arranged in the upper cover body, a floating body (2) is arranged in the valve body (1), a valve clack (4) is correspondingly arranged above the floating body (2), a trace exhaust structure is arranged on the valve clack (4), and a small amount of pressurized air in the valve cavity can be allowed to be exhausted outwards under the sealing state of the valve clack (4) by the trace exhaust structure.

2. The slow closing water hammer prevention air valve of claim 1, wherein: the flow limiting structure comprises a buffer body (7) and a support frame (21) which are connected to an upper cover body and arranged up and down, a through hole is formed in the middle of the support frame (21), a guide sleeve (8) is inserted into the through hole, a guide shaft (10) is connected above the guide sleeve (8), a flow limiting plate (9) is sleeved on the guide shaft (10), and the flow limiting plate (9) moves upwards along the guide shaft (10) under the thrust action of gas and abuts against the buffer body (7) so as to reduce the gas displacement of the gas in a valve cavity.

3. The slow closing water hammer prevention air valve of claim 2, wherein: a guide rod (20) is arranged above the valve clack (4), and the upper part of the guide rod (20) extends into the guide sleeve (8) and moves up and down along the shaft.

4. The slow-closing type water hammer prevention air valve according to claim 1 or 3, wherein: the micro exhaust structure comprises an exhaust piece (22) arranged at the top of the valve clack (4), and a micro exhaust hole (14) communicating the valve cavity with the air inlet and exhaust channel is formed in the exhaust piece (22); the top of the floating body (2) is provided with a sealing gasket (3) matched with the micro-exhaust hole (14), and the floating body moves upwards under the buoyancy action of water to seal the micro-exhaust hole (14).

5. The slow closing water hammer prevention air valve of claim 4, wherein: the exhaust member is provided separately from the guide rod (20) or is formed integrally therewith.

6. The slow closing water hammer prevention air valve of claim 1, wherein: a bearing disc (16) used for bearing the floating body (2) is arranged in the valve body (1), a limiting column (15) is arranged at the bottom of the floating body (2), and the limiting column (15) penetrates out of the bearing disc (16) and moves up and down along the axial direction.

7. The slow closing water hammer prevention air valve of claim 1, wherein: a plurality of guide ribs (19) are arranged in the valve body (1).

8. The slow closing water hammer prevention air valve of claim 1, wherein: a sealing ring (5) is clamped at the contact position between the upper cover body and the valve body (1), and the sealing ring (5) extends along the radial inner side to form a sealing ring extension section which can be tightly attached to the valve clack (4).

9. The slow closing water hammer prevention air valve of claim 8, wherein: the joint surface of the extending section of the sealing ring and the valve clack (4) is in a step-shaped arrangement.

10. The slow closing water hammer prevention air valve of claim 1, wherein: a protective net (12) is arranged at the air outlet of the upper cover body.