Composite exhaust valve for low and medium pressure lines

Abstract

The utility model provides a kind of composite exhaust valve for low pressure pipeline, including valve body, the top of valve body is equipped with main exhaust port, the bottom of valve body is equipped with pipeline interface, the top edge of valve body is equipped with trace exhaust valve;There is movable ball in inner cavity, there is sealing ring on main exhaust port, the upper portion of ball and sealing ring abut;At least two auxiliary lifting devices are provided in inner cavity;Any auxiliary lifting device includes a spring and an auxiliary strut;One end of auxiliary strut is hinged with the lateral wall of inner cavity, the other end of auxiliary strut and the lower portion of ball abut;The middle part of auxiliary strut is hinged with one end of spring, the other end of spring is also hinged with the lateral wall of inner cavity;The position of spring and inner cavity lateral wall hinge is higher than the position of auxiliary strut and inner cavity lateral wall hinge.The utility model solves the technical problem that sealing is not strict and ball is easily stuck when the pressure in pipeline system is lower in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of valves, and more particularly to the field of composite exhaust valves, especially a composite exhaust valve for medium and low pressure pipelines. Background Technology

[0002] A composite air vent valve is a device installed at the highest point of pressurized pipeline systems such as water supply, fire protection, and HVAC systems to automatically release air from the pipes. Air is often mixed in with the water in the pipeline system. During system operation, this air will precipitate due to temperature and pressure changes and accumulate at high points in the network. If not removed in time, this accumulated gas will form air resistance, reducing the flow cross-section, increasing energy consumption, causing system pressure fluctuations and water hammer accidents, and leading to inaccurate metering by equipment such as pipeline flow meters. The composite air vent valve can effectively release gas from the pipeline and automatically open to provide negative pressure protection for the pipeline system when pressure is lost.

[0003] In existing technologies, composite air release valves generally employ a float structure. Their working principle is as follows: the valve body is connected to the system pipeline via a bottom pipe interface, and the internal float rises and falls with the water level inside the valve body. When the water level inside the valve body is low, the float falls, opening the main air release port for a large amount of air release; when the valve body is full of water, the float rises, closing the main air release port, at which point a small amount of air release is continuously performed by the micro-air release valve at the top edge.

[0004] However, this type of float-type composite exhaust valve also has the following drawbacks:

[0005] 1. When the pressure in the pipeline system is low, the fluid pressure acting on the float is small. The buoyancy of the float itself may not be enough to generate sufficient clamping force to ensure that the float and the sealing ring of the main exhaust port fit tightly together, resulting in poor sealing and leakage, and failing to effectively maintain the pressure in the pipeline.

[0006] 2. When fluid impacts or pressure fluctuates, the float ball is prone to deflection or swaying within the valve body, which may cause friction or even jamming with the inner wall of the valve body or the guide mechanism, leading to the failure of the exhaust valve. Utility Model Content

[0007] The purpose of this utility model is to provide a composite exhaust valve for medium and low pressure pipelines. This composite exhaust valve for medium and low pressure pipelines aims to solve the technical problems of poor sealing and easy jamming of the float ball when the pressure in the pipeline system is low in the prior art.

[0008] This utility model provides a composite exhaust valve for medium and low pressure pipelines, including a valve body. The valve body has a main exhaust port at its top and a pipeline interface at its bottom. A micro-exhaust valve is provided at the top edge of the valve body. A movable float is provided in the inner cavity, and a sealing ring is provided on the main exhaust port, with the upper part of the float abutting against the sealing ring. At least two auxiliary lifting devices are provided in the inner cavity. Each auxiliary lifting device includes a spring and an auxiliary support rod. One end of the auxiliary support rod is hinged to the side wall of the inner cavity, and the other end of the auxiliary support rod abuts against the lower part of the float. The middle part of the auxiliary support rod is hinged to one end of the spring, and the other end of the spring is also hinged to the side wall of the inner cavity. The position where the spring is hinged to the side wall of the inner cavity is higher than the position where the auxiliary support rod is hinged to the side wall of the inner cavity.

[0009] Furthermore, the auxiliary lifting device is symmetrically arranged along the axis of the main exhaust port.

[0010] Furthermore, the auxiliary support rod is provided with a lug in the middle, and the two ends of the spring are hook-shaped structures. The spring is connected to the hanging hole on the lug through the hook-shaped structure at one end to form a hinge; the hook-shaped structure at the other end of the spring is connected to the mounting hole on the side wall of the inner cavity to form a hinge.

[0011] Furthermore, the inner cavity has a ball support located below the float, and the ball support has a guide hole that runs vertically through it; the lower end of the float has a vertically arranged tail guide rod, which is sleeved with the guide hole.

[0012] Furthermore, the tail guide rod is in the shape of an inverted cone or an inverted frustum.

[0013] Compared with existing technologies, the advantages of this invention are positive and obvious:

[0014] 1. This utility model utilizes an auxiliary lifting device composed of a spring and an auxiliary support rod. When the float rises, the tension of the spring is converted into an additional upward clamping force through the auxiliary support rod. This force, together with the buoyancy, ensures that the float can be stably pressed against the sealing ring of the main exhaust port even when the system pressure is very low and the buoyancy of the medium is insufficient, thus solving the problem of sealing leakage in medium and low pressure pipelines.

[0015] 2. This utility model achieves three-point coordinated guidance of the float through the tail guide rod and the auxiliary support rods on both sides. The tail guide rod is responsible for the main guidance, while the two auxiliary support rods support the float from both sides of the lower half of the float and restrict its lateral movement. This improves the stability of the float's movement, effectively prevents the float from deflecting, swaying, and getting stuck under fluid impact, and improves the reliability and accuracy of valve operation. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the float sinking in this embodiment of the present invention.

[0017] Figure 2 A schematic diagram of the structure when the float rises in this embodiment of the present invention.

[0018] Figure 3 A schematic diagram of the main structure of the auxiliary support rod in this embodiment of the present invention.

[0019] Figure 4 A top view of the auxiliary support rod in this embodiment of the present invention.

[0020] Figure 5 A schematic diagram of the auxiliary support rod from the left side in this embodiment of the present invention.

[0021] In the diagram: 1. Valve body; 101. Inner cavity; 102. Main exhaust port; 103. Pipeline interface; 104. Micro exhaust valve; 2. Float; 201. Tail guide rod; 3. Sealing ring; 4. Ball support; 5. Spring; 6. Auxiliary support rod; 601. Hanging lug; 602. Hinge. Detailed Implementation

[0022] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0023] like Figures 1 to 5 As shown, this embodiment provides a composite exhaust valve for medium and low pressure pipelines, including a valve body 1. The valve body 1 has a main exhaust port 102 at the top, a pipeline interface 103 at the bottom for connecting to the pipeline system, and a micro exhaust valve 104 at the top edge. The main exhaust port 102, the pipeline interface 103 and the micro exhaust valve 104 are all connected to the inner cavity 101 of the valve body 1.

[0024] A float 2 is installed in the inner cavity 101 of the valve body 1. A circular sealing ring 3 is installed at the main exhaust port 102. The upper spherical surface of the float 2 can form a sealing contact with the sealing ring 3 of the main exhaust port 102, thereby achieving the sealing of the main exhaust port 102. In order to guide the float 2 to move vertically in the inner cavity 101, a ball support 4 is fixed in the inner cavity 101 of the valve body 1 below the float 2. A circular guide hole that runs vertically through the center of the ball support 4 is opened. A tail guide rod 201 extending downward is fixedly connected to the bottom center of the float 2. The tail guide rod 201 is inserted into the guide hole and sleeved with the guide hole, and can slide freely up and down along the guide hole. To further optimize the guidance, the tail guide rod 201 is designed as an inverted frustum shape, and in other embodiments it can also be an inverted cone shape.

[0025] Two auxiliary lifting devices are provided in the inner cavity 101 of the valve body 1. These two auxiliary lifting devices are symmetrically arranged along the axis of the main exhaust port 102. Each auxiliary lifting device includes an auxiliary support rod 6 and a tension spring 5.

[0026] The auxiliary support rod 6 is long and rod-shaped. One end of the auxiliary support rod 6 is hinged to the hinge seat on the side wall of the inner cavity 101 via a hinge 602, allowing the auxiliary support rod 6 to swing around this fulcrum. The free end of the auxiliary support rod 6 away from the hinge end abuts against the lower outer surface of the float 2, thereby providing an upward support for the float 2.

[0027] At the middle of the auxiliary support rod 6, there is an upward-facing lug 601 with a hanging hole. Both ends of the tension spring 5 are bent into hook shapes. One end of the spring 5 hooks onto the hanging hole of the lug 601, and the other end hooks onto another mounting hole located above the side wall of the inner cavity 101 of the valve body 1. This mounting hole is positioned higher than the hinge point between the auxiliary support rod 6 and the side wall of the inner cavity 101, so that the spring 5 applies an upward pulling force to the auxiliary support rod 6 in its natural state. This allows the auxiliary support rods 6 on both sides of the float 2 to simultaneously apply an upward lifting force to the float 2, making the float 2 more tightly abut against the sealing ring 3 on the main exhaust port 102, thus solving the problem of poor sealing caused by pressure drops in medium and low pressure pipelines. In addition, the auxiliary support rods 6 lifting the float 2 from both sides can also keep the float 2 stable and prevent it from tilting and getting stuck.

[0028] This embodiment has three working states:

[0029] State 1: Large amount of exhaust.

[0030] The pipeline begins to fill with water, and the air content inside valve body 1 far exceeds the water content. At this time, water continuously enters through pipe interface 103, and the water level inside valve body 1 gradually rises. Float 2, due to its own weight, falls to its lowest position and separates from the main vent 102, opening the main vent 102. At this time, the auxiliary support rod 6 maintains the stability of float 2, preventing it from tilting and jamming. A large amount of air in the pipeline, driven by the water, enters valve body 1 through pipe interface 103 and is then discharged at high speed through the main vent 102. At this time, the micro-vent valve is essentially inactive.

[0031] State 2: Minimal exhaust.

[0032] The pipe is filled with water, but dissolved air continuously precipitates out, forming small bubbles. These bubbles accumulate at the top of valve body 1. The water level inside valve body 1 causes float 2 to float. Under the combined action of the buoyancy of the medium and the upward pressing force generated by the auxiliary lifting device, float 2 is stably and tightly pressed against the sealing ring 3 of the main exhaust port 102, closing the main exhaust port 102. This ensures a good sealing effect even when buoyancy is insufficient under low pressure, preventing leakage. The tiny bubbles in valve body 1 are slowly and continuously discharged from the micro-vent valve 104.

[0033] Status 3: Negative pressure protection status.

[0034] When a pipeline ruptures due to an accident or is shut down for maintenance and is emptied, the internal pressure drops rapidly, creating a negative pressure, and the water level in valve body 1 decreases. Float 2 falls under its own weight, separating from the sealing ring 3 of the main vent 102, opening the main vent 102. External air, under atmospheric pressure, is rapidly drawn into valve body 1 from the main vent 102, and then enters the pipeline system through pipe interface 103, thus balancing the pressure inside and outside the pipeline and preventing the pipeline from collapsing.

[0035] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A composite exhaust valve for medium and low pressure pipelines, comprising a valve body (1), wherein a main exhaust port (102) is provided at the top of the valve body (1), a pipeline interface (103) is provided at the bottom of the valve body (1), and a micro exhaust valve (104) is provided at the top edge of the valve body (1); a movable float (2) is provided in the inner cavity (101), and a sealing ring (3) is provided on the main exhaust port (102), wherein the upper part of the float (2) abuts against the sealing ring (3); characterized in that: At least two auxiliary lifting devices are provided in the inner cavity (101); Each of the aforementioned auxiliary lifting devices includes a spring (5) and an auxiliary support rod (6); one end of the auxiliary support rod (6) is hinged to the side wall of the inner cavity (101) via a hinge (602), and the other end of the auxiliary support rod (6) abuts against the lower part of the float (2); the middle part of the auxiliary support rod (6) is hinged to one end of the spring (5), and the other end of the spring (5) is also hinged to the side wall of the inner cavity (101); the position where the spring (5) is hinged to the side wall of the inner cavity (101) is higher than the position where the auxiliary support rod (6) is hinged to the side wall of the inner cavity (101).

2. A composite exhaust valve for medium and low pressure pipelines according to claim 1, characterized in that: The auxiliary lifting device is symmetrically arranged along the axis of the main exhaust port (102).

3. A composite exhaust valve for medium and low pressure pipelines according to claim 1, characterized in that: The auxiliary support rod (6) has a hanging lug (601) in the middle. The two ends of the spring (5) are hook-shaped structures. The spring (5) is connected to the hanging hole on the hanging lug (601) through the hook-shaped structure at one end to form a hinge. The hook-shaped structure at the other end of the spring (5) is connected to the mounting hole on the side wall of the inner cavity (101) to form a hinge.

4. A composite exhaust valve for medium and low pressure pipelines according to claim 1, characterized in that: The inner cavity (101) has a ball support (4) located below the float (2), and the ball support (4) has a guide hole that runs vertically through it; the lower end of the float (2) has a vertically arranged tail guide rod (201), and the tail guide rod (201) is sleeved with the guide hole.

5. A composite exhaust valve for medium and low pressure pipelines according to claim 4, characterized in that: The tail guide rod (201) is inverted conical or inverted frustum shape.

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