Quick coupling for liquid fuel handling

Abstract

The application relates to the technical field of quick connectors, in particular to a liquid fuel loading and unloading quick connector capable of reducing residual liquid discharge, which comprises a connector pipe, a valve core, a telescopic mechanism arranged on one end of the valve core close to an outlet of the connector pipe, and a control mechanism arranged on the connector pipe and in transmission connection with the valve core and the telescopic mechanism. The control mechanism is used for controlling displacement of the valve core, so that a sealing surface of the valve core is in contact with or separated from a counter connector, the connector pipe is blocked or opened, and the telescopic mechanism is synchronously controlled to be retracted or extended by the control mechanism when the valve core is displaced. In use, the control mechanism is used for controlling displacement of the valve core, the connector pipe is blocked and opened, the telescopic mechanism is used for changing a flow area of the liquid fuel in the connector pipe, the liquid fuel is conveniently passed, and residual liquid is discharged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quick couplings, in particular to a liquid fuel loading and unloading quick coupling capable of reducing residual liquid discharge. BACKGROUND

[0002] With the use of liquid hydrogen and liquefied natural gas and other liquid fuels, the transportation volume thereof is also increasing rapidly. At present, the transportation of liquid fuels is mainly by pipeline transportation and tank truck transportation. In the process of tank truck loading and transportation, the loading and unloading of materials are involved. The crane pipe, as a special equipment for tank loading and unloading, is widely used in the petrochemical industry. The main body thereof is connected with rigid pipes and elbows through rotary joints to realize the butt joint between the tank truck and the storage and transportation pipeline and the transmission of the medium. Compared with the old-fashioned hose, it has the characteristics of high safety and flexibility.

[0003] The conventional bottom loading and unloading crane pipe is connected by a ball valve cooperating with a quick female connector. The standard male connector on the tank is connected by pulling the handle of the butt joint end, and then the ball valve is opened for loading. Since the conventional quick connector does not have a dry separation (self-sealing) function, when it is separated from the tank truck, a large amount of residual liquid will be generated in the section from the crane pipe vertical ball valve to the truck end ball valve. Since the liquid fuel is easily volatilized and its volume will increase by 100 times after being discharged, the vapor volatilized from the liquid fuel is flammable and explosive, which will pose a great threat to the surrounding environment and human safety. At the same time, long-term high-concentration discharge will also cause resource waste. For example, a liquefied petroleum gas transport tank truck in the loading and unloading area of a company's storage and transportation department leaked during unloading operation, causing a major explosion and fire accident, resulting in multiple casualties. According to the investigation, the cause of the accident was that the liquid fuel leaked during loading and unloading, and then rapidly vaporized and encountered an ignition source, causing a violent explosion. SUMMARY

[0004] The technical problem to be solved by the present application is that the conventional quick connector does not have a dry separation (self-sealing) function, so when it is separated from the tank truck, a large amount of residual liquid will be generated in the section from the crane pipe vertical ball valve to the truck end ball valve. The residual liquid will pose a great threat to the surrounding environment and human safety, and long-term high-concentration discharge will also cause resource waste. To solve this problem, the present application provides a liquid fuel loading and unloading quick connector capable of reducing residual liquid discharge.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a liquid fuel loading and unloading quick connector capable of reducing residual liquid discharge, comprising a connector pipe, a valve core slidingly arranged in the connector pipe, an extension mechanism arranged on one end of the valve core close to an outlet of the connector pipe, a control mechanism arranged on the connector pipe and in transmission connection with the valve core and the extension mechanism, the control mechanism being used to control displacement of the valve core so that a sealing surface of the valve core is in contact with or separated from a mating connector, thereby achieving plugging or opening of the connector pipe, and at the same time, when the valve core is displaced, the control mechanism synchronously controls the extension mechanism to retract or extend, and changes a flow area of liquid fuel in the connector pipe, thereby achieving easy passage of the liquid fuel or discharge of residual liquid. Compared with the prior art, the present scheme controls displacement of the valve core through the control mechanism, achieves plugging and opening of the connector pipe, and the extension mechanism is used to change the flow area of the liquid fuel in the connector pipe, so as to achieve the purposes of easy passage of the liquid fuel and discharge of residual liquid as much as possible.

[0006] In order to realize the extension mechanism, preferably, some embodiments, the extension mechanism comprises a control rod and a bellows, one end of the control rod is slidingly arranged on the valve core in a displacement direction of the valve core, one end of the control rod is arranged on the control mechanism, the other end of the control rod extends towards the one end of the valve core close to the outlet of the connector pipe, one end of the bellows is arranged on the other end of the control rod, and the other end of the bellows is arranged on the valve core.

[0007] Preferably, some embodiments, a balance mechanism is arranged between the extension mechanism and the control mechanism, the balance mechanism is used to balance pressures on both sides of the valve core when loading and unloading are completed and the valve core plugs the connector pipe, thereby achieving removal of the connector pipe.

[0008] Preferably, some embodiments, the balance mechanism comprises a hose, one end of the hose is arranged on the one end of the control rod close to the opening of the connector pipe, the other end of the hose is arranged on the valve core, the valve core has a cavity therein, the other end of the hose is in communication with the cavity, the control mechanism is provided with a pressure relief plug corresponding to the hose, and the one end of the valve core away from the bellows is provided with a through hole in communication with the cavity.

[0009] Preferably, some embodiments, the pressure relief plug is made of rubber.

[0010] Preferably, some embodiments, the control mechanism comprises a screw rod and a guide rail, the guide rail is fixedly installed on the connector pipe, the guide rail is fixedly connected in the connector pipe, the screw rod is in threaded connection with the guide rail and the valve core respectively, and one end of the screw rod is in rotational connection with the control rod.

[0011] Preferably, some embodiments, the valve core is provided with a sliding hole matched with the control rod, and the control rod is slidingly arranged in the sliding hole.

[0012] Preferably, in some embodiments, a sealing shoulder is arranged in the adapter pipe to correspond to the sealing surface of the valve core, and the sealing shoulder and the sealing surface of the valve core are in contact with each other when the adapter pipe is blocked.

[0013] Preferably, in some embodiments, a slider is arranged on the valve core, the slider is located between the valve core and the adapter pipe, and the slider abuts against the inner peripheral wall of the adapter pipe.

[0014] Preferably, in some embodiments, a separation prevention mechanism is arranged on the adapter pipe to prevent the adapter pipe from being separated from the tanker adapter during loading and unloading.

[0015] The present application has the following beneficial effects: the liquid fuel loading and unloading quick connector capable of reducing residual liquid discharge of the present application controls the displacement of the valve core through the control mechanism during use, realizes the blocking and opening of the adapter pipe, and the expansion mechanism is used to change the flow area of the liquid fuel in the adapter pipe, so as to facilitate the passage of the liquid fuel and discharge the residual liquid as much as possible. The conventional quick connector does not have a dry separation (self-sealing) function, so when the tanker is separated, a large amount of residual liquid will be generated in the section from the gooseneck pipe to the ball valve at the end of the tanker, which will cause great threat to the surrounding environment and human safety. At the same time, long-term high-concentration discharge will also cause waste of resources. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below in combination with the drawings and examples.

[0017] Figure 1 is a schematic view of the internal structure of the present application;

[0018] Figure 2 is Figure 1 A-A sectional view in Figure

[0019] Figure 3 is Figure 1 B-B sectional view in Figure

[0020] Figure 4 is Figure 1 C-C sectional view in Figure

[0021] Figure 5 is Figure 1 the local enlarged view of D in Figure

[0022] Figure 6 is a schematic view of the structure of the present application during loading and unloading;

[0023] Figure 7 is Figure 6 the local enlarged view of E in Figure

[0024] In the figure: 1, joint pipe, 2, valve core, 3, control rod, 4, corrugated pipe, 5, hose, 6, pressure relief plug, 7, cavity body, 8, through hole, 9, screw rod, 10, guide rail, 11, sealing shoulder, 12, slider, 13, anti-dropping mechanism. DETAILED DESCRIPTION

[0025] The present application is further described below in conjunction with embodiments:

[0026] The present application is not limited to the following specific embodiments, and those skilled in the art can implement the present application in other various specific embodiments according to the disclosure of the present application, or any simple changes or modifications made by using the design structure and ideas of the present application, all fall within the protection scope of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] As Figures 1-7As shown, a liquid fuel loading and unloading quick connector capable of reducing residual liquid discharge includes a connector pipe 1 and a valve core 2, the valve core 2 is slidingly arranged in the connector pipe 1, an extension mechanism is arranged on the valve core 2 near the end of the connector pipe 1 outlet, a control mechanism is arranged on the connector pipe 1, the control mechanism is drivingly connected with the valve core 2 and the extension mechanism respectively, the control mechanism is used to control the displacement of the valve core 2, so that the sealing surface of the valve core 2 is in contact with or separated from the connector, thereby achieving the plugging or opening of the connector pipe 1, and at the same time, when the valve core 2 is displaced, the control mechanism synchronously controls the extension mechanism to retract or extend, and changes the flow area of the liquid fuel in the connector pipe 1, thereby facilitating the passage of liquid fuel or the discharge of residual liquid.

[0030] The extension mechanism includes a control rod 3 and a bellows 4, one end of the control rod 3 is slidingly arranged on the valve core 2, the control rod 3 slides along the displacement direction of the valve core 2, one end of the control rod 3 is arranged on the control mechanism, the other end of the control rod 3 extends to the end of the valve core 2 close to the outlet of the connector pipe 1, one end of the bellows 4 is arranged on the other end of the control rod 3, and the other end of the bellows 4 is arranged on the valve core 2. In this embodiment, the material of the bellows 4 is metal.

[0031] After the loading and unloading are completed, the valve core 2 plugs the connector pipe 1, and due to the certain pressure in the valve core 2, it is difficult to remove the connector pipe 1. In order to facilitate the removal of the connector pipe 1, a balancing mechanism is arranged between the extension mechanism and the control mechanism, the balancing mechanism is used to balance the pressure on both sides of the valve core 2 when the loading and unloading are completed and the valve core 2 plugs the connector pipe 1, thereby achieving the removal of the connector pipe 1. By controlling the balancing mechanism, the pressure on both sides of the valve core 2 is balanced, the connector pipe 1 is quickly and conveniently removed, and the situation that the pressure on one side of the bellows 4 is too large, so that the quick connector cannot be easily separated from the tank car connector, is avoided. The quick connector has small resistance and fast loading time.

[0032] The balancing mechanism includes a hose 5, one end of the hose 5 is arranged on the end of the control rod 3 close to the opening of the connector pipe 1, the other end of the hose 5 is arranged on the valve core 2, the valve core 2 has a cavity 7, the other end of the hose 5 communicates with the cavity 7, a pressure relief plug 6 corresponding to the hose 5 is arranged on the control mechanism, and a through hole 8 communicating with the cavity 7 is formed in the end of the valve core 2 away from the bellows 4. In order to improve the sealing performance of the pressure relief plug 6 on one end of the hose 5, the material of the pressure relief plug 6 is rubber, the rubber has a certain elastic deformation ability, which can better seal one end of the hose 5 and effectively ensure the sealing performance of the hose 5.

[0033] The control mechanism includes a screw rod 9 and a guide rail 10, the guide rail 10 is fixedly installed on the connector pipe 1, the guide rail 10 is fixedly connected in the connector pipe 1, the screw rod 9 is threadedly connected with the guide rail 10 and the valve core 2 respectively, and one end of the screw rod 9 is rotatably connected with the control rod 3.

[0034] The valve core 2 is provided with a sliding hole matched with the control rod 3, and the control rod 3 is slidingly arranged in the sliding hole.

[0035] The joint pipe 1 is provided with a sealing shaft shoulder 11 corresponding to the sealing surface of the valve core 2, and the sealing shaft shoulder 11 is in contact with the sealing surface of the valve core 2 when the joint pipe 1 is blocked.

[0036] The valve core 2 is provided with a sliding block 12 between the valve core 2 and the joint pipe 1, and the sliding block 12 abuts against the inner circumferential wall of the joint pipe 1.

[0037] In order to prevent the joint from being separated from the tank truck, the joint pipe 1 is provided with an anti-separation mechanism 13 for preventing the joint pipe 1 from being separated from the tank truck during loading and unloading. The anti-separation mechanism 13 prevents the joint pipe 1 from being separated from the tank truck during loading and unloading of liquid fuel, avoiding the possibility of the quick joint being separated during the filling process, a large amount of liquid fuel being leaked and causing an accident.

[0038] The above-mentioned quick joint for loading and unloading liquid fuel can reduce residual liquid discharge. During loading and unloading of liquid fuel, the joint pipe 1 is connected to the tank truck, the joint pipe 1 is locked on the tank truck by the anti-separation mechanism 13, then the screw rod 9 at the control mechanism is rotated, first the screw rod 9 rotates on the valve core 2 and the guide rail 10, at this time the valve core 2 is in a static state, and the screw rod 9 and the valve core 2 are relatively displaced, the screw rod 9 drives the control rod 3 to displace into the joint pipe 1, the pressure relief plug 6 is separated from one end of the hose 5, and at the same time the control rod 3 slides on the valve core 2, when the control rod 3 cannot slide relative to the valve core 2, the bellows 4 is contracted in the joint pipe 1, because the length of the bellows 4 is shortened, the contact area with the liquid fuel is reduced, the flow area of the liquid fuel is increased, the flow of the liquid fuel is increased, the loading time of the liquid fuel is reduced, at the same time the valve core 2 displaces into the joint pipe 1, the sliding block 12 slides in the joint pipe 1, the joint pipe 1 is opened, then the valve of the storage tank is opened, and the loading and unloading of the liquid fuel is started.

[0039] When the liquid fuel loading and unloading is completed, the tank valve is closed, then the screw 9 drives the valve core 2 to move, and the valve core 2 is in contact with the sealing shaft shoulder 11 in the joint pipe 1, the joint pipe 1 is blocked, at the same time, the screw 9 drives the control rod 3 to slide on the valve core 2, the bellows 4 is elongated, the space in the joint pipe 1 is reduced, the residual liquid is discharged, and the relief plug 6 blocks the hose 5, the relief plug 6 plays a sealing role in the process of discharging the residual liquid after the liquid fuel is filled, prevents the liquid fuel from flowing out of the plastic hose 5, causes the residual liquid to increase, reduces the amount of residual liquid fuel, at the same time, due to the existence of the pressure in the joint, the pressure on both sides of the valve core 2 is unbalanced, the joint pipe 1 is difficult to be taken off from the tank car, for this, the screw 9 controls the balance mechanism, the rotation of the screw 9 of the control mechanism drives the relief plug 6 to separate from one end of the hose 5, realizes the conduction of both ends of the valve core 2, also makes the pressure on both sides of the valve core 2 balanced, makes the quick coupling more easily to be taken off, loosens the buckle of the anti-unloading mechanism 13, takes off the quick coupling from the tank car, and the loading and unloading is completed.

[0040] The above ideal embodiment according to the application is an inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content of the specification, and must be determined according to the scope of claims.

Claims

1. A quick connector for loading and unloading liquid fuels that can reduce residual liquid discharge, comprising a connector pipe (1), characterized in that: It also includes a valve core (2), which is slidably disposed in the connector tube (1). A telescopic mechanism is provided on one end of the valve core (2) near the outlet of the connector tube (1). A control mechanism is provided on the connector tube (1). The control mechanism is connected to the valve core (2) and the telescopic mechanism respectively. The control mechanism is used to control the displacement of the valve core (2) so that the sealing surface of the valve core (2) contacts or separates from the connector, thereby blocking or opening the connector tube (1). At the same time, when the valve core (2) is displaced, the control mechanism synchronously controls the telescopic mechanism to contract or extend, and changes the flow area of ​​liquid fuel in the connector tube (1) to facilitate the passage of liquid fuel or discharge of residual liquid. The telescopic mechanism includes a control rod (3) and a bellows (4). One end of the control rod (3) is slidably mounted on the valve core (2) along the displacement direction of the valve core (2). One end of the control rod (3) is mounted on the control mechanism. The other end of the control rod (3) extends towards the valve core (2) near the outlet of the connector pipe (1). One end of the bellows (4) is mounted on the other end of the control rod (3). The other end of the bellows (4) is mounted on the valve core (2). The valve core (2) has a sliding hole that matches the control rod (3), and the control rod (3) is slidably disposed in the sliding hole; When in use, the control rod (3) slides on the valve core (2). When the control rod (3) cannot slide relative to the valve core (2), the bellows (4) retracts into the connector pipe (1). As the length of the bellows (4) becomes shorter, the contact surface with the liquid fuel is reduced, which increases the flow area of ​​the liquid fuel.

2. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 1, characterized in that: A balancing mechanism is provided between the telescopic mechanism and the control mechanism. The balancing mechanism is used to balance the pressure on both sides of the valve core (2) when the loading and unloading are completed and the valve core (2) blocks the connector pipe (1), so as to remove the connector pipe (1).

3. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 2, characterized in that: The balancing mechanism includes a hose (5), one end of which is located at the end of the control rod (3) near the opening of the connector pipe (1), and the other end of which is located on the valve core (2). The valve core (2) has a cavity (7) inside, and the other end of the hose (5) is connected to the cavity (7). The control mechanism is provided with a pressure relief plug (6) corresponding to the hose (5), and the valve core (2) has a through hole (8) connected to the cavity (7) at the end away from the bellows (4).

4. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 3, characterized in that: The pressure relief plug (6) is made of rubber.

5. A quick connector for loading and unloading liquid fuels that reduces residual liquid discharge according to claim 4, characterized in that: The control mechanism includes a screw (9) and a guide rail (10). The guide rail (10) is fixedly installed on the connector tube (1) and is fixedly connected inside the connector tube (1). The screw (9) is threadedly connected to the guide rail (10) and the valve core (2) respectively. One end of the screw (9) is rotatably connected to the control rod (3).

6. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 1, characterized in that: The connector tube (1) is provided with a sealing shoulder (11) that corresponds to the sealing surface of the valve core (2). When the connector tube (1) is blocked, the sealing shoulder (11) and the sealing surface of the valve core (2) come into contact with each other.

7. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 1, characterized in that: A slider (12) is provided on the valve core (2). The slider (12) is located between the valve core (2) and the connector tube (1). The slider (12) abuts against the inner peripheral wall of the connector tube (1).

8. A quick connector for loading and unloading liquid fuel that reduces residual liquid discharge according to claim 1, characterized in that: The connector pipe (1) is provided with an anti-detachment mechanism (13) to prevent it from detaching from the tank truck connector during loading and unloading.

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