A tank top vacuum valve

Abstract

The utility model provides a kind of tank top vacuum valve, specifically relates to the technical field of vacuum protection of normal low pressure storage tank.The vacuum valve includes displacement sensor, elbow type valve body, valve core and valve rod;The elbow type valve body includes inlet, expansion port and suction inlet;The inlet and suction inlet are respectively located at the bottom of both sides of elbow type valve body;The expansion port is located at the top of elbow type valve body corresponding to the position located directly above inlet;The suction inlet is provided with valve seat, and the valve core is arranged at the side of valve seat away from suction inlet;The bottom end of valve rod is hinged with the top of valve core by pivot, and the top end of valve rod is connected with the guiding assembly of the outer wall of elbow type valve body;The suction inlet is opened or blocked by lifting or completely adhering with valve seat of valve core.The utility model adopts hinged valve core and valve rod structure, which can satisfy the reliable sealing of valve core under the up-and-down movement state of valve rod;In addition, the setting of online detection interface can realize the annual inspection of valve.

Description

Technical Field

[0001] This utility model relates to the field of vacuum protection technology for normal and low-pressure storage tanks, specifically to a tank top vacuum valve. Background Technology

[0002] Conventional vacuum safety valves are difficult to open under the same pressure, and the valve core and seat do not seal properly when the valve stem is tilted. When the valve stem is tilted, there is an angle between the valve core plane and the valve seat plane. This results in uneven sealing force acting on the valve seat, and in some cases, one side may not make contact. Insufficient sealing force leads to leakage at weak points in the valve seat sealing surface, negatively impacting the preservation of the medium in the storage tank and the protection of the atmospheric environment.

[0003] In addition, the status of conventional vacuum safety valves cannot be observed remotely. Detecting their status requires maintenance personnel to approach and observe through the suction port, which consumes a lot of manpower and resources and is not conducive to large-scale management and monitoring. It also has time limitations. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a tank top vacuum valve, the specific technical solution of which is as follows: A tank-top vacuum valve includes a displacement sensor, an elbow-type valve body, a valve core, and a valve stem. The elbow-type valve body includes an inlet, an expansion port, and a suction port. The inlet and suction port are located at the bottom of both sides of the elbow-type valve body. The expansion port is located at the top of the elbow-type valve body, corresponding to a position directly above the inlet. The suction port is provided with a valve seat, and the valve core is located on the side of the valve seat away from the suction port. The bottom end of the valve stem is hinged to the top of the valve core via a pivot, and the top end of the valve stem is connected to a guide assembly on the outer wall of the elbow-type valve body. The suction port is opened or closed by lifting the valve core or by fully contacting it with the valve seat.

[0005] Preferably, the elbow-type valve body is provided with an online detection interface on the side near the inlet, and the cutting direction of the online detection interface is perpendicular to the side wall of the elbow-type valve body. The online detection interface is used to connect to an external air source.

[0006] Preferably, the displacement sensor is connected to one side of the bottom of the valve core via a connecting rod.

[0007] Preferably, the displacement sensor is electrically connected to the computer control center.

[0008] Preferably, the turning radius R of the elbow-type valve body 弯 The inlet diameter D is 0.8 to 1.2 times. 进 .

[0009] Preferably, the diameter D of the expansion port 扩 The inlet diameter D is 0.9 to 1.0 times.进 .

[0010] Preferably, the distance H between the displacement sensor and the valve seat 感 The inlet diameter D is 1.0 to 2.0 times. 进 The distance between the online detection interface and the inlet flange is 0.1 to 0.2 times the inlet diameter D. 进 .

[0011] More preferably, the expansion port is provided with a removable sealing flange.

[0012] Even more preferably, the inlet is connected to the tank body.

[0013] More preferably, a gap is reserved at the connection between the valve stem and the guide assembly; the outer wall of the elbow-type valve body is also provided with a sealing structure that wraps around the guide assembly and the part of the valve stem extending out of the guide assembly at a position directly above the suction port.

[0014] The beneficial effects of this utility model are: 1. This utility model achieves the requirements of high discharge capacity and fast valve opening by coupling and optimizing key dimensional parameters such as the bend radius and expansion port diameter that affect the valve discharge capacity; 2. This utility model, through the hinged design of the valve core and valve stem, combined with the small gap reserved at the connection between the valve stem and the guide assembly, can achieve slight adjustment of the valve stem tilt, ensuring the tight fit between the valve core and the valve seat, and guaranteeing the overall sealing performance of the valve; 3. This utility model has an online inlet detection interface on the side of the storage tank, which can realize the annual inspection of the valve; 4. This utility model adds an expansion port. If necessary, the expansion port sealing flange can be removed and a call valve structure can be installed at this location to achieve the valve's call and draw functions simultaneously without an external interface, thus meeting the various pressure regulation needs of the storage tank. 5. This utility model can realize remote real-time monitoring of the valve core opening status through a displacement sensor. Attached Figure Description

[0015] The accompanying drawings constituting this utility model are provided to further understand this application and do not constitute an undue limitation on this application.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram, 1-elbow-type valve body; 2-valve core; 3-valve seat; 4-online detection interface; 5-rotating shaft; 6-valve stem; 7-displacement sensor. Detailed Implementation

[0017] The specific implementation of the tank top vacuum valve provided by this utility model will be further described in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, a tank-top vacuum valve includes an elbow-type valve body 1, a valve core 2, a valve stem 6, and a displacement sensor 7. Specifically, the elbow-type valve body 1 includes an inlet, an expansion port, and a suction port; the inlet is connected to the tank body; the inlet and suction port are located at the bottom of both sides of the elbow-type valve body 1; the expansion port is located at the top of the elbow-type valve body 1, corresponding to the position directly above the inlet.

[0019] Preferably, the suction port is provided with a valve seat 3, and the valve core 2 is located on the side of the valve seat 3 away from the suction port; the bottom end of the valve stem 6 is hinged to the top of the valve core 2 via a pivot 5, and the top end of the valve stem 6 is connected to a guide assembly on the outer wall of the elbow-type valve body 1. A gap is reserved at the connection between the valve stem 6 and the guide assembly, which can be used to adjust the slight tilt of the valve stem 6 caused by the lifting of the valve core 2. The suction port is opened or blocked by lifting the valve core 2 or by fully fitting it against the valve seat 3.

[0020] Preferably, the elbow-type valve body 1 is provided with an online detection interface 4 near the inlet side. It is worth emphasizing that the cutting direction of the online detection interface 4 is perpendicular to the side wall of the elbow-type valve body 1. When the valve needs annual inspection, the valve on the inlet side of the tank is closed, the online detection interface 4 is connected to an external air source, and the displacement sensor 7 is used to detect the vacuum valve's sealing performance, set pressure, and whether there is any leakage, so as to promptly identify problems and replace or repair it.

[0021] Preferably, the displacement sensor 7 is connected to the bottom side of the valve core 2 via a connecting rod, and the state of the valve core 2 is transmitted to the external displacement sensor 7 via the connecting rod, so as to realize real-time monitoring of the opening and closing state of the vacuum valve inlet; the displacement sensor 7 is electrically connected to the computer control center of the system, thereby realizing remote monitoring.

[0022] Preferably, this invention studies the internal flow field of the vacuum valve on the tank top and optimizes key parameters such as the turning radius of the elbow-type valve body 1, the diameter of the expansion port, and the distance between the displacement sensor and the valve seat, which affect the valve's discharge capacity, thereby achieving the design and optimization of a high-discharge internal flow channel. Specifically: the turning radius R of the elbow-type valve body... 弯 The inlet diameter D is 0.8 to 1.2 times. 进 The diameter D of the expansion port 扩 The inlet diameter D is 0.9 to 1.0 times. 进 The distance H between the displacement sensor and the valve seat 感 The inlet diameter D is 1.0 to 2.0 times. 进The distance between the online detection interface and the inlet flange is 0.1 to 0.2 times the inlet diameter D. 进 .

[0023] More preferably, the expansion port is provided with a detachable sealing flange. When it is necessary to add a call valve structure, the sealing flange is removed and the expansion port is used as the call outlet. This enables the vacuum valve to perform both call and draw functions without adding an external interface, thus meeting the needs of various pressure regulation conditions.

[0024] More preferably, the outer wall of the elbow-type valve body 1 is also provided with a sealing structure that wraps around the guide assembly and the valve stem 6 extending out of the guide assembly, corresponding to the position directly above the suction port, so as to achieve micro-tilt adjustment of the valve stem 6 while ensuring the overall sealing of the vacuum valve.

[0025] The specific working principle of this vacuum valve is as follows: The vacuum valve on the top of the tank, via a hinged valve core 2 and valve stem 6, senses the opening and closing of the suction port caused by the combined effect of the pressure difference between the inside and outside of the tank and gravity. When the set pressure inside the tank is higher than the pressure difference between the inside and outside of the tank, the valve seat 3 is compressed under the combined effect of the pressure difference between the upper and lower parts of the valve core 2 and gravity, and the valve core 2 and valve seat 3 are tightly fitted, and the vacuum valve is in a sealed state; when the set pressure inside the tank is lower than the pressure difference between the inside and outside of the tank, the valve core 2 is lifted upward, the suction port opens, and the vacuum is broken.

[0026] It is worth noting that the valve core 2 and the valve stem 6 are connected by a rotating shaft. When the valve core 2 is lifted upward and the valve stem 6 moves up and down, the included angle between the valve core 2 and the valve stem 6 is not restricted. Even if the valve stem 6 is in a slightly tilted state after the pressure is released, it will not affect the tight fit between the valve core 2 and the valve seat 3. This solves the problem that the valve stem tilting after the vacuum is broken in traditional vacuum valves may cause poor contact between the valve core and the valve seat on one side, or even leakage.

[0027] This invention can increase the displacement by more than 50%. When the valve core is open, the displacement sensor can detect it in real time, thereby realizing real-time monitoring of the inlet valve status.

[0028] In this utility model, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this utility model and do not specifically refer to any part or element of this utility model; they should not be construed as limiting this utility model. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and they should not be construed as limiting this utility model.

[0029] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A tank top vacuum valve, characterized in that, Includes displacement sensor, elbow-type valve body, valve core and valve stem; The elbow-type valve body includes an inlet, an expansion port, and a suction port; the inlet and suction port are located at the bottom of both sides of the elbow-type valve body; the expansion port is located at the top of the elbow-type valve body, corresponding to the position directly above the inlet; The inlet is provided with a valve seat, and the valve core is located on the side of the valve seat away from the inlet; the bottom end of the valve stem is hinged to the top of the valve core via a pivot, and the top end of the valve stem is connected to the guide assembly on the outer wall of the elbow-type valve body. The inlet is opened or blocked by lifting the valve core or by fully fitting it against the valve seat.

2. The tank top vacuum valve according to claim 1, characterized in that, The elbow-type valve body is provided with an online detection interface on the side near the inlet. The cutting direction of the online detection interface is perpendicular to the side wall of the elbow-type valve body. The online detection interface is used to connect to an external air source.

3. The tank top vacuum valve according to claim 1, characterized in that, The displacement sensor is connected to one side of the bottom of the valve core via a connecting rod.

4. The tank top vacuum valve according to claim 3, characterized in that, The displacement sensor is electrically connected to the computer control center.

5. The tank top vacuum valve according to claim 1, characterized in that, The turning radius R of the elbow-type valve body 弯 The inlet diameter D is 0.8 to 1.2 times. 进 .

6. The tank top vacuum valve according to claim 1, characterized in that, The diameter D of the expansion port 扩 The inlet diameter D is 0.9 to 1.0 times. 进 .

7. The tank top vacuum valve according to claim 1, characterized in that, The distance H between the displacement sensor and the valve seat 感 The inlet diameter D is 1.0 to 2.0 times. 进 ; The distance between the online detection interface and the inlet flange is 0.1 to 0.2 times the inlet diameter D. 进 .

8. The tank top vacuum valve according to claim 1, characterized in that, The expansion port is equipped with a removable sealing flange.

9. The tank top vacuum valve according to claim 1, characterized in that, The inlet is connected to the tank.

10. The tank top vacuum valve according to claim 1, characterized in that, A gap is reserved at the connection between the valve stem and the guide assembly; The outer wall of the elbow-type valve body is also provided with a sealing structure that wraps around the guide assembly and the part of the valve stem that extends out of the guide assembly, corresponding to the position directly above the inlet.

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