Double-valve type exhaust valve

Abstract

The double-clack type exhaust valve comprises a valve body and a double-clack assembly, a valve cavity with an air inlet in the lower portion is arranged in the valve body, and an exhaust channel communicated with the valve cavity is arranged on the upper portion of the valve body. The double-clack assembly comprises a first valve clack and a second valve clack which are rotationally connected, and an elastic piece is arranged on one side of the first valve clack and one side of the second valve clack. When the exhaust channel exhausts air, the first valve clack and the second valve clack can rotate under the action of airflow, and in the rotating process of the first valve clack and the second valve clack, the elastic piece applies elastic force opposite to the rotating direction to the first valve clack and the second valve clack. According to the scheme, the exhaust channel can be prevented from being blown and blocked in advance when the exhaust channel exhausts air; during air suction, air suction is fast, and negative pressure in the pipeline is eliminated in time; in addition, the exhaust valve in the scheme can be applied to a high-flow-speed, large-flow or high-pressure pipeline system.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust valves, and more particularly to a double-flap exhaust valve. Background Art

[0002] During the process of pipeline water transportation, air valves need to be installed at locations including the pump outlet pipe, local high points of long-distance water pipelines, long horizontal sections, long uphill sections, and the end of horizontal sections to ensure high-speed exhaust when filling with water, and at the same time, to quickly inhale air when the water pipe is emptied to prevent negative pressure from forming in the pipeline and damaging the pipeline, thereby improving water delivery efficiency and protecting the smooth operation of the pipeline.

[0003] A search of the announcement number CN110701369A discloses an air valve comprising a valve body, wherein a valve cavity with a bottom opening is provided in the valve body, a quick exhaust channel connected to the valve cavity is provided at the upper end of the valve body, and a regulating valve is provided along the cross section of the quick exhaust channel. The regulating valve comprises two valve flaps that can be closed toward the side walls of the quick exhaust channel, and the two valve flaps can rotate under the action of air pressure. In this solution, the exhaust flow rate of the quick exhaust channel is controlled by two valve flaps that can be closed toward the side walls of the quick exhaust channel. However, in a water supply pipeline system, when the pump is started to fill water, if the water filling speed is too fast and the exhaust flow rate is too large, the valve flap is easily blown off prematurely in this solution, causing water hammer.

[0004] The sudden cessation of water flow when the exhaust valve closes can cause water hammer. The pressure rise from this water hammer is proportional to the flow velocity before the pipe stops flowing. The higher the flow velocity, the greater the pressure rise and the potential damage to valves and seals. Therefore, the above solution is not suitable for high-flow, high-volume, or high-pressure pipe systems with rapid filling. Utility Model Content

[0005] The utility model provides a double-flap exhaust valve, which can be applied to high-flow, large-flow or high-pressure pipeline systems, reducing the risk of the exhaust valve being blown and blocked prematurely, or reducing the pressure generated by water hammer when the valve is closed in the pipeline.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0007] A double-flap exhaust valve, comprising:

[0008] A valve body, wherein a valve cavity having an air inlet at the lower portion is provided in the valve body, and an exhaust passage communicating with the valve cavity is provided at the upper portion of the valve body;

[0009] Also includes:

[0010] A double-flap assembly disposed in the exhaust passage includes a first valve flap and a second valve flap rotatably connected, wherein elastic members are disposed on one side of the first valve flap and the second valve flap so as to close the first valve flap and the second valve flap to each other;

[0011] When the exhaust channel is exhausting, the first valve flap and the second valve flap can rotate and expand under the action of the airflow, so that the exhaust area of the exhaust channel gradually becomes smaller, and during this rotation process of the first valve flap and the second valve flap, the elastic member applies an elastic force on the first valve flap and the second valve flap that is opposite to the rotation direction.

[0012] In this solution, a double-flap assembly is provided, and an elastic member is provided on one side of the first valve flap and the second valve flap. The exhaust passage is exhausted, and the first valve flap and the second valve flap can rotate and expand under the action of the airflow. At the same time, the elastic member applies an elastic force to the first valve flap and the second valve flap in the opposite direction of the rotation. The greater the rotation amplitude of the first valve flap and the second valve flap, the greater the elastic resistance they encounter. The elastic member can continuously adjust the rotation amplitude of the first valve flap and the second valve flap according to the size of the airflow, so that the first valve flap and the second valve flap can adaptively control the size of the exhaust area according to the different airflows, thereby avoiding the exhaust passage from being exhausted too quickly and the exhaust passage being blown away in advance; when inhaling, it allows for rapid inhalation and timely elimination of negative pressure in the pipeline. At the same time, due to the effect of the elastic member, the exhaust valve in this solution can be applied to high-flow rate, large-flow or high-pressure pipeline systems.

[0013] As a further improvement, the first valve flap and the second valve flap are connected via a hinged rod; the elastic member is a torsion spring and is sleeved on the hinged rod.

[0014] Preferably, one end of the elastic member is connected to the first valve flap, and the other end is connected to the second valve flap.

[0015] Preferably, the dual-flap assembly further includes a connecting rod having both ends fixed to the inner sidewall of the exhaust passage; the elastic member includes a first elastic member and a second elastic member, one end of the first elastic member and the second elastic member being connected to the connecting rod and the other end thereof being connected to the first valve flap and the second valve flap, respectively. The first elastic member and the second elastic member are respectively connected to the first valve flap and the second valve flap, so that the first valve flap and the second valve flap are not affected by each other during rotation.

[0016] In a preferred embodiment, the first and / or second valve flaps define exhaust holes; the upper portion of the exhaust passage has an air outlet, and the exhaust hole area accounts for 3%-10% of the outlet area. The exhaust holes are positioned so that even after the first and second valve flaps rotate to abut against the inner wall of the exhaust passage, a certain amount of exhaust is still available at the outlet, preventing the outlet from completely closing and causing water hammer during exhaust.

[0017] In one embodiment, a float that can move up and down is provided in the valve cavity, and a sealing assembly is also provided on the inner wall of the valve body. The float moves upward to be sealed with the sealing assembly to seal the exhaust channel and prevent medium leakage.

[0018] Preferably, the sealing assembly includes a valve seat and a sealing ring, wherein the valve seat is fixedly connected to the valve body, and the sealing ring is embedded between the valve seat and the inner wall of the valve body. When the float moves upward, it can contact the sealing ring for sealing, thereby achieving a better sealing effect.

[0019] Furthermore, the valve body includes an upper valve body, a lower valve body and a connecting cover connected between the upper valve body and the lower valve body, the exhaust channel is located in the upper valve body, and the valve cavity is located in the lower valve body; the sealing assembly is arranged on the connecting cover.

[0020] Furthermore, a casing is fixedly arranged in the valve cavity, and the lower part of the float is connected to a guide rod, which passes through the casing and the float is located in the casing. Due to the presence of the casing, impurities can be prevented from entering and affecting the up and down movement of the float.

[0021] As a further improvement, a protective cover is provided above the exhaust passage, and a filter screen is provided between the protective cover and the upper valve body. Both the protective cover and the filter screen can prevent foreign matter from entering the exhaust valve through the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the exhaust valve;

[0023] Figure 2 This is a schematic diagram of the double-flap assembly structure in the exhaust valve;

[0024] Figure 3 It is a schematic diagram of the enlarged structure of the double-petal assembly;

[0025] Figure 4 It is a top view of the exhaust valve;

[0026] Figure 5 for Figure 4 AA cross-sectional diagram of the middle exhaust valve;

[0027] Figure 6 Schematic diagram of the state of the double-petal assembly during the expansion process.

[0028] Description of labels:

[0029] 1. Valve body; 11. Float; 111. Guide rod; 12. Casing; 13. Valve seat; 14. Sealing ring; 15. Air inlet; 2. Upper valve body; 21. Air outlet; 31. First valve disc; 32. Second valve disc; 33. First exhaust hole; 34. Second exhaust hole; 35. Articulated rod; 36. Connecting rod; 37. First elastic member; 38. Second elastic member; 4. Filter; 5. Protective cover. DETAILED DESCRIPTION

[0030] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0031] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0032] At the same time, the terms such as "upper", "lower", "left", "right", "inside", "outside", and "middle" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of this utility model without substantially changing the technical content. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0033] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0034] The exhaust valve is usually installed at a higher position in the water pipeline system. It is used to discharge the air in the water pipeline during the initial filling of the water pipeline and the filling of water after regular maintenance of the pipeline, so as to avoid water hammer or bridging water hammer caused by pressure fluctuations during flushing or water outage.

[0035] like Figure 1-6 As shown, this embodiment provides a double-flap exhaust valve, including a valve body 1 and a double-flap assembly.

[0036] Combine Figure 4 、 Figure 5 and Figure 6 As shown, a valve cavity is provided in the valve body 1, and an air inlet 15 is provided at the lower portion of the valve cavity. An exhaust passage communicating with the valve cavity is provided at the upper portion of the valve body 1, and an air outlet 21 is provided at the upper portion of the exhaust passage.

[0037] In this embodiment, the valve body 1 comprises an upper valve body 2, a lower valve body, and a connecting cover connected between the upper and lower valve bodies 2. The exhaust passage is located within the upper valve body 2, and the valve cavity is located within the lower valve body. A float 11 is provided within the valve cavity, which can move up and down. A sealing assembly is also provided on the inner sidewall of the valve body 1. When the float 11 moves upward, it seals the sealing assembly and seals the exhaust passage. When the water supply pipeline is filled with water, water enters the valve cavity through the air inlet 15. The float 11 moves upward under the action of the water until it seals with the sealing assembly, sealing the exhaust passage and preventing water leakage.

[0038] Preferably, the sealing assembly includes a valve seat 13 and a sealing ring 14. The valve seat 13 is fixedly connected to the valve body 1, and the sealing ring 14 is embedded between the valve seat 13 and the inner wall of the valve body 1. Furthermore, the sealing assembly is provided on the connecting cover, and the valve seat 13 of the sealing assembly is connected to the connecting cover.

[0039] A protective sleeve 12 is fixedly mounted within the valve chamber. The lower portion of the float 11 is connected to a guide rod 111, which passes through the protective sleeve 12 and within which the float resides. The upper end of the protective sleeve 12 is fixedly mounted between the lower valve body and the connecting cover. The protective sleeve 12 also includes multiple through-holes for gas circulation. The float 11 moves up and down with the rise and fall of the water level within the valve chamber. The presence of the protective sleeve 12 prevents impurities from entering and affecting the upward and downward movement of the float 11. As the water level within the valve chamber rises, the float 11 can promptly close the exhaust valve, preventing leakage of the medium.

[0040] Combine Figure 2 and Figure 3 As shown, in this embodiment, the exhaust valve further includes a dual-flap assembly disposed within the exhaust passage. The dual-flap assembly comprises a first valve flap 31 and a second valve flap 32 rotatably connected. When exhaust is released from the exhaust passage, the first and second valve flaps 31, 32 rotate and expand under the influence of the airflow, respectively moving toward the inner wall of the exhaust passage. During this rotation, the closer the first and second valve flaps 31, 32 approach the inner wall of the exhaust passage, the smaller the exhaust area of the exhaust passage.

[0041] However, if the double-flap assembly is only provided with a first valve flap 31 and a second valve flap 32 that are rotatably connected, the airflow is large during high-speed water filling and exhaust, and the airflow will inevitably blow the first valve flap 31 and the second valve flap 32 quickly to fit the inner wall of the exhaust channel, causing the exhaust valve to be blocked prematurely and resulting in valve closing water hammer.

[0042] As a further improvement in this embodiment, elastic members are installed on one side of the first and second valve flaps 31, 32. When exhaust is not in progress, the elastic members exert a force on the first and second valve flaps 31, 32, keeping them in a closed, close position. It should be noted that "closed, close" means that the first and second valve flaps 31, 32 are not completely abutted against each other, but rather have an angle between them, allowing airflow to cause the flaps to rotate and expand. In this closed, close position, the exhaust passageway maximizes its gas flow area.

[0043] However, when the exhaust channel is venting, the first valve flap 31 and the second valve flap 32 can rotate and expand under the action of the airflow, causing the exhaust area of the exhaust channel to gradually decrease. During this rotation process, the elastic member applies an elastic force to the first valve flap 31 and the second valve flap 32 in the opposite direction of rotation. In a pipeline system, when the exhaust valve is rapidly filled with water, it is also rapidly vented. Under the action of the airflow, the first valve flap 31 and the second valve flap 32 rotate and expand and move toward the inner side wall of the exhaust channel, causing the exhaust area of the exhaust channel to gradually decrease. At the same time, the elastic member applies an elastic force to the first valve flap 31 and the second valve flap 32 in the opposite direction of rotation. This elastic force hinders the rotation of the first valve flap 31 and the second valve flap 32, thereby preventing the exhaust valve from being blocked. Moreover, as the first valve flap 31 and the second valve flap 32 rotate more, the elastic force applied by the elastic member increases, thereby further overcoming the premature closure of the exhaust channel by the first valve flap 31 and the second valve flap 32. Furthermore, as the first and second valve flaps 31, 32 rotate, the elastic force applied by the elastic member changes accordingly as the rotational amplitude of the first and second valve flaps 31, 32 changes, thereby linearly adjusting the exhaust area of the exhaust passage. Simultaneously, the elastic member continuously adjusts the rotational amplitude of the first and second valve flaps 31, 32 based on the airflow, allowing the first and second valve flaps 31, 32 to adaptively control the exhaust area in response to varying airflows.

[0044] Specifically, the first valve flap 31 and the second valve flap 32 are connected by a hinged rod 35, the ends of which are fixed to the inner wall of the exhaust passage. The elastic member is a torsion spring and is mounted on the hinged rod 35. After the exhaust valve is exhausted, during pipeline operation, the elastic member applies a force to the first and second valve flaps 31 and 32, forcing the two valve flaps into a closed position close to each other. However, due to the hinged position limit of the first and second valve flaps 31 and 32 and the hinged rod 35, the two valve flaps cannot completely fit together, and a certain angle still exists between them. However, in this state, the elastic member acts to bring the first and second valve flaps 31 and 32 into maximum proximity, maximizing the gas flow area of the exhaust passage. In the event of a water outage or pipe burst, the exhaust valve can quickly inhale air, promptly eliminating negative pressure in the pipeline. During exhaust, air flows between the two valve flaps, causing them to expand under the action of the airflow.

[0045] In one embodiment, one end of the elastic member is connected to the first valve flap 31 , and the other end is connected to the second valve flap 32 .

[0046] As a preferred embodiment, Figure 3 In the embodiment, the dual-flap assembly also includes a connecting rod 36, with both ends fixed to the inner sidewall of the exhaust passage. The elastic members include a first elastic member 37 and a second elastic member 38. One end of the first elastic member 37 and the second elastic member 38 are connected to the connecting rod 36, and the other ends are connected to the first valve flap 31 and the second valve flap 32, respectively. The first elastic member 37 and the second elastic member 38 are provided so that the first valve flap 31 and the second valve flap 32 do not affect each other during rotation.

[0047] As a further improvement, exhaust holes are provided on both the first valve flap 31 and the second valve flap 32, namely the first exhaust hole 33 and the second exhaust hole 34, and the area of the two exhaust holes accounts for 5% of the area of the air outlet 21. In other cases, the percentage of the exhaust hole area to the area of the air outlet 21 can also be set to other values, but it needs to be within the range of 3%-10%. It should be noted that in some cases, the number of exhaust holes is not limited, and can be provided on the first valve flap 31 or on the second valve flap 32. The exhaust holes are provided so that after the first valve flap 31 and the second valve flap 32 rotate to fit the inner wall of the exhaust channel, the air outlet 21 still has a certain exhaust volume, thereby avoiding the complete closure of the air outlet during exhaust and causing closing water hammer.

[0048] In this embodiment, a protective cover 5 is installed above the upper air outlet 21 of the exhaust channel. The protective cover 5 is fixedly connected to the upper valve body 2 via a screw. A filter screen 4 is also installed between the protective cover 5 and the upper valve body 2. The protective cover 5 is provided to prevent dust from entering the valve and, when the exhaust valve is installed outdoors, to prevent rainwater from entering the valve. The filter screen 4 has a number of through holes. The filter screen 4 is used to prevent small animals and flying insects from entering the exhaust valve. It also prevents dead branches and leaves from being sucked into the exhaust valve when the water supply is cut off and the exhaust valve is inhaling air.

[0049] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A double-flap exhaust valve, comprising: A valve body (1), wherein a valve cavity having an air inlet (15) at a lower portion is provided in the valve body (1), and an exhaust passage communicating with the valve cavity is provided at an upper portion of the valve body (1); It is characterized by further comprising: A double-flap assembly arranged in the exhaust passage comprises a first valve flap (31) and a second valve flap (32) that are rotatably connected, wherein elastic members are arranged on one side of the first valve flap (31) and the second valve flap (32) so that the first valve flap (31) and the second valve flap (32) are brought close to each other and closed; When the exhaust channel is exhausted, the first valve flap (31) and the second valve flap (32) can rotate and expand under the action of the airflow, so that the exhaust area of the exhaust channel gradually becomes smaller, and during the rotation of the first valve flap (31) and the second valve flap (32), the elastic member applies an elastic force opposite to the rotation direction to the first valve flap (31) and the second valve flap (32).

2. The double-flap exhaust valve according to claim 1, characterized in that: The first valve flap (31) and the second valve flap (32) are connected via a hinged rod (35); the elastic member is a torsion spring and is sleeved on the hinged rod (35).

3. The double-flap exhaust valve according to claim 2, characterized in that: One end of the elastic member is connected to the first valve flap (31), and the other end is connected to the second valve flap (32).

4. The double-flap exhaust valve according to claim 2, characterized in that: The double-flap assembly further includes a connecting rod (36) whose two ends are fixed to the inner side wall of the exhaust channel; the elastic member includes a first elastic member (37) and a second elastic member (38), one end of the first elastic member (37) and the second elastic member (38) are connected to the connecting rod (36), and the other end is connected to the first valve flap (31) and the second valve flap (32) respectively.

5. The double-flap exhaust valve according to any one of claims 1 to 4, characterized in that: An exhaust hole is provided on the first valve flap (31) and / or the second valve flap (32); An air outlet (21) is provided at the upper portion of the exhaust channel, and the area of the exhaust hole accounts for 3%-10% of the area of the air outlet (21).

6. The double-flap exhaust valve according to claim 1, characterized in that: A float (11) that can move up and down is provided in the valve cavity, and a sealing component is also provided on the inner side wall of the valve body (1). The float (11) can be sealed and connected with the sealing component when it moves up.

7. The double-flap exhaust valve according to claim 6, characterized in that: The sealing assembly comprises a valve seat (13) and a sealing ring (14); the valve seat (13) is fixedly connected to the valve body (1); and the sealing ring (14) is embedded between the valve seat (13) and the inner wall of the valve body (1).

8. The double-flap exhaust valve according to claim 6, characterized in that: The valve body (1) comprises an upper valve body (2), a lower valve body, and a connecting cover connected between the upper valve body (2) and the lower valve body, the exhaust passage is located in the upper valve body (2), and the valve cavity is located in the lower valve body; the sealing assembly is arranged on the connecting cover.

9. The double-flap exhaust valve according to any one of claims 6 to 8, characterized in that: A casing (12) is fixedly arranged in the valve cavity, and the lower part of the float (11) is connected to a guide rod (111). The guide rod (111) passes through the casing (12) and the float (11) is located in the casing (12).

10. The double-flap exhaust valve according to claim 8, characterized in that: A protective cover (5) is provided above the exhaust passage, and a filter screen (4) is also provided between the protective cover (5) and the upper valve body (2).

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