Special bolt well lid for static test of refueling bolt of airport apron pipe network and use method of bolt well lid

Abstract

The invention discloses a bolt well lid special for static testing of a refueling bolt of an airport apron pipe network and a using method of the bolt well lid, and belongs to the technical field of airport apron pipe network maintaining.The bolt well lid comprises a bolt well body, the refueling bolt, a well lid body and a pressure observation instrument; the bolt well is excavated in the airport apron, and the refueling bolt is buried in the bolt well; a through hole is formed in the center of the well lid, the through hole is communicated with the outside and the inner side of the bolt well, a hole cover is arranged at an opening of the through hole through a spring hinge, the hole cover is kept in an open state under the action of the spring hinge, and the bistable elastic piece covers the through hole. The outer edge of the bistable elastic piece is connected to the inner wall of the through hole in a sealed mode, and a handle piece is arranged in the center of the bistable elastic piece. The pressure observation instrument comprises a pressure measuring head and a pressure observation indicating dial, the pressure measuring head is arranged on the inner wall of the through hole and located on the inner side of the bistable elastic piece, and the pressure observation indicating dial is installed on the inner wall of the hole cover and used for displaying data of the pressure measuring head.

Description

Technical Field

[0001] This invention belongs to the field of apron pipeline maintenance technology, and in particular relates to a special manhole cover for static testing of refueling hydrants in apron pipelines and its usage method. Background Technology

[0002] Safety inspection of refueling plugs in the apron refueling pipeline system is a critical process in airport construction and a key focus of airport acceptance. To ensure the reliability of refueling plugs, maintenance personnel need to regularly check their sealing. Currently, there are no dedicated testing tools for static testing of refueling plugs during routine maintenance. The health status can only be judged by observing the amount of oil produced after pressing the plug well. There are no clear quantitative indicators, and the existence of human error leads to insufficient reliability of refueling plugs. Summary of the Invention

[0003] One of the purposes of this application is to change the current situation where the daily maintenance of refueling plugs relies solely on human experience and judgment, and to quantify the judgment indicators by measuring the internal pressure of the refueling plug to help determine the sealing reliability of the entire device.

[0004] To address the technical problem of unreliable subjective judgment in the daily maintenance of existing refueling hydrants, this application provides a special hydrant well cover for static testing of refueling hydrants in apron pipelines, characterized by including a hydrant well, a refueling hydrant, a well cover, and a pressure monitoring instrument; The hydrant well is excavated on the apron, and the fuel hydrant is buried in the hydrant well; The manhole cover has a through hole in the center, which connects the outside to the inside of the manhole. The opening of the through hole is fitted with a cover by a spring hinge. The cover is kept open by the spring hinge. The manhole cover also includes a bistable spring that covers the through hole. The outer edge of the bistable spring is sealed to the inner wall of the through hole. A handle is provided in the center of the bistable spring. The pressure observation instrument includes a pressure measuring head and a pressure observation indicator. The pressure measuring head is disposed on the inner wall of the through hole and located inside the bistable spring. The pressure observation indicator is installed on the inner wall of the hole cover and is used to display the pressure measuring head data.

[0005] Furthermore, the present invention provides a special hydrant cover for static testing of refueling hydrants in apron pipelines, which further includes a sealing ring. The sealing ring surrounds the through hole and is attached to the inner wall of the hydrant cover. When the hydrant cover is closed onto the hydrant well, the sealing ring presses against the edge of the hydrant opening.

[0006] Furthermore, the present invention provides a special manhole cover for static testing of refueling hydrants in apron pipelines, wherein the bistable spring is stamped into a dome shape by Ni-Ti shape memory alloy, and the handle is welded in the center, with the handle located on the outside of the bistable spring.

[0007] Furthermore, the present invention provides a special hydrant cover for static testing of refueling hydrants in apron pipelines, which further includes a rebound self-locking device. The rebound self-locking device includes a body and a locking tooth. The body is installed on the inner wall of the hydrant cover, and the locking tooth is threadedly connected to the end of the handle. This design takes into account that in actual use, sometimes the bistable spring is forgotten to be reset. In this case, the hydrant cover will be in the open state for a long time, posing a safety hazard. With the rebound self-locking device, the hydrant cover cannot be closed if the bistable spring is not reset, because in this state, the body on the inner wall of the hydrant cover cannot engage the locking tooth. Only when the locking tooth is lifted by the bistable spring can the two engage smoothly, and the hydrant cover can be closed smoothly.

[0008] The second objective of this application is to provide a method of use, relating to a special hydrant cover for static testing of refueling hydrants in apron pipelines. This cover includes a press-fit hole cover, a body and locking teeth disengaged, the hole cover opened under the action of a spring hinge, the handle was pressed down, a bistable spring switched to a stable state, the dome position of the bistable spring opened the hydrant cover, a pressure measuring head collected data, a pressure observation indicator displayed data, the handle was lifted up, the bistable spring reset and closed the hydrant cover, the hole cover was closed, and the body and locking teeth engaged.

[0009] Compared with the prior art, the special plug cover for static testing of refueling plugs in apron pipelines provided by this invention has the following advantages: The tool designed in this application can measure the internal pressure of the refueling plug. The specially designed bistable spring structure, when the handle is pressed, the bistable spring switches to a stable state and is biased to the other side. Its own elastic force pushes open the plug cover, and the oil in the refueling plug leaks and fills the cavity between the plug cover and the bistable spring. The pressure measuring head installed on the inner wall of the through hole can measure the internal static pressure of the refueling plug. Since the refueling plug is connected to the entire refueling pipeline network, the value accurately read by the pressure observation indicator not only directly reflects the sealing performance of the refueling plug itself, but also indirectly reflects the health status of the entire pipeline network. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1A schematic diagram of the special manhole cover for static testing of fuel hydrants in apron pipelines provided by the present invention; Figure 2 The exploded view of the uncovered structure of the special manhole cover for static testing of refueling hydrants in apron pipelines provided by this invention.

[0012] Among them, 1. well plug; 2. oil plug; 3. well cover; 4. sealing ring; 5. through hole; 6. spring hinge; 7. hole cover; 8. bistable spring; 9. handle; 10. body; 11. locking tooth; 12. pressure measuring head; 13. pressure observation indicator; 14. plug cover. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0015] like Figure 1 and Figure 2 As shown, this embodiment provides a special hydrant cover 3 for static testing of apron pipeline refueling hydrant 2, which includes hydrant well 1, refueling hydrant 2, cover 3, sealing ring 4, rebound self-locking device and pressure observation instrument; The hydrant well 1 is excavated on the apron, and the refueling hydrant 2 is buried in the hydrant well 1; The manhole cover 3 has a through hole 5 in the center, which connects the outside to the inside of the hydrant well 1. The opening of the through hole 5 is fitted with a cover 7 via a spring hinge 6. The cover 7 is kept open by the spring hinge 6. The manhole cover 3 also includes a bistable spring 8, which covers the through hole 5. The outer edge of the bistable spring 8 is sealed to the inner wall of the through hole 5. A handle 9 is provided in the center of the bistable spring 8. A sealing ring 4 surrounds the through hole 5 and is attached to the inner wall of the manhole cover 3. When the manhole cover 3 is closed to the hydrant well 1, the sealing ring 4 presses against the edge of the hydrant opening of the fuel filler 2. The rebound self-locking device includes a body 10 and a locking tooth 11. The body 10 is installed on the inner wall of the manhole cover 7, and the locking tooth 11 is threaded to the end of the handle 9. The pressure observation instrument includes a pressure measuring head 12 and a pressure observation indicator 13. The pressure measuring head 12 is disposed on the inner wall of the through hole 5 and located inside the bistable spring 8. The pressure observation indicator 13 is installed on the inner wall of the hole cover 7 and is used to display the data of the pressure measuring head 12. The bistable spring 8 is made of Ni-Ti shape memory alloy stamped into a dome shape, with the handle 9 welded to the center. The handle 9 is located on the outside of the bistable spring 8. The usage method and principle are as follows: During inspection, manually press the hole cover 7. The body 10 and the locking teeth 11 disengage from the locked state. The hole cover 7 flips open under the action of the spring hinge 6. At this time, the bistable spring 8 protrudes outward in a dome-like state. Pinch the locking teeth 11 and press down on the handle 9. The handle 9 forces the bistable spring 8 to switch to a stable state and bulge downward. The bulging bistable spring 8 directly contacts the plug cover 14 and pushes the plug cover 14 open. At this time, the oil in the filler plug 2 leaks out. The upper side of the cap 14 is filled with the inner cavity of the bistable spring 8. The pressure measuring head 12 is placed in the cavity of the cap to measure the pressure value and display the pressure value through the pressure observation indicator 13. After the measurement is completed, the handle 9 is lifted by pinching the tooth 11. The bistable spring 8 switches to the stable state and bulges upward. The bistable spring 8 and the cap are disengaged. The cap closes automatically and closes the hole cover 7. The body 10 of the inner wall of the hole cover 7 bites the tooth 11 again. Thus, the pressure monitoring of the refueling plug 2 is completed. It should be noted that the rebound self-locking device mentioned in this embodiment is existing technology, consisting of a body 10 and a locking tooth 11, and its structural principle will not be repeated here. Theoretical principle: When the cap is opened, only a temporary sealed space can be formed between the bistable spring 8 and the cap. Therefore, the pressure observation indicator 13 can only measure an instantaneous pressure Po. The pressure error ΔP caused by factors such as water hammer effect and changes in storage space volume, and the actual internal pressure P of the filler plug 2, are related as follows: P=Po±ΔP Because the sealed space is small during operation, the water hammer effect has little impact on the actual situation, and the pressure loss can be ignored. During operation, all parts are standard parts with fixed dimensions, the properties of the aviation fuel fluid remain unchanged, and the internal fluid pressure of the refueling plug 2 is within a safe pressure range. Therefore, ΔP can be regarded as a small constant value. Thus, in engineering, the instantaneous pressure value Po can be used to represent the actual internal pressure P of the plug body.

[0016] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0017] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A special manhole cover for static testing of refueling hydrants in apron pipelines, characterized in that, Includes a hydrant well (1), a fuel filler (2), a well cover (3), and a pressure monitoring instrument; The hydrant well (1) is excavated on the apron, and the refueling hydrant (2) is buried in the hydrant well; The manhole cover (3) has a through hole (5) in the center, which connects the outside to the inside of the manhole (1). The opening of the through hole (5) is fitted with a cover (7) through a spring hinge (6). The cover (7) is kept open under the action of the spring hinge (6). The manhole cover (7) also includes a bistable spring (8), which covers the through hole (5). The outer edge of the bistable spring (8) is sealed to the inner wall of the through hole (5). A handle (9) is provided in the center of the bistable spring (8). The pressure observation instrument includes a pressure measuring head (12) and a pressure observation indicator (13). The pressure measuring head (12) is disposed on the inner wall of the through hole (5) and located inside the bistable spring (8). The pressure observation indicator (13) is installed on the inner wall of the hole cover (7) and is used to display the data of the pressure measuring head (12).

2. The special manhole cover for static testing of refueling hydrants in apron pipelines according to claim 1, characterized in that, It also includes a sealing ring (4), which surrounds the through hole (5) and is attached to the inner wall of the well cover (3). While the well cover (3) covers the hydrant well (1), the sealing ring (4) presses against the edge of the hydrant opening of the refueling plug (2).

3. The special manhole cover for static testing of refueling hydrants in apron pipelines according to claim 1, characterized in that, The bistable spring (8) is stamped into a dome shape from Ni-Ti shape memory alloy, and the handle (9) is welded in the center. The handle (9) is located on the outside of the bistable spring (8).

4. The special manhole cover for static testing of refueling hydrants in apron pipelines according to claim 1, characterized in that, It also includes a rebound self-locking device, which includes a body (10) and a locking tooth (11). The body (10) is installed on the inner wall of the hole cover (7), and the locking tooth (11) is threaded to the end of the handle (9).

5. A method of use, relating to the special manhole cover for static testing of refueling hydrants in apron pipelines as described in claim 4, characterized in that, The process includes pressing the hole cover (7), disengaging the body (10) and the locking teeth (11), opening the hole cover (7) under the action of the spring hinge (6), pressing down the handle (9), switching the bistable spring (8) to a stable state, and opening the plug cover (14) of the oil filler (2) at the dome position of the bistable spring (8), collecting data from the pressure measuring head (12), displaying data on the pressure observation indicator (13), lifting the handle (9), resetting the bistable spring (8) to close the plug cover (14), closing the hole cover (7), and engaging the body (10) and locking teeth (11).

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