Pneumatic control valve for liquid adding gun

Abstract

The utility model discloses a pneumatic control valve for a liquid adding gun, which comprises a control element, a cavity is arranged in the control element, the cavity is kept to be communicated with an external air source, the cavity in the control element is divided into a plurality of areas, and each area can be kept to be communicated with and disconnected from the external air source. A cavity area in the control element is communicated with and disconnected from an external air source according to an operation sequence, the operation sequence is the operation sequence when the liquid adding gun is used for filling liquid, and the three steps of liquid adding, pressure relief and gun withdrawing of the liquid adding gun are integrated through the operation sequence, and sequential continuous control is carried out. The pneumatic control valve is convenient to pneumatically control the liquid adding gun, the automatic clamping and filling process can be conveniently achieved when the liquid adding gun fills liquid into external equipment, and the automatic clamping and filling process can be achieved according to the operation sequence (locking, filling, pressure relief and gun withdrawing) of the liquid adding gun. It can be guaranteed that the control element achieves communication and disconnection between all the areas of the inner cavity and the external air source according to the operation sequence.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquefied natural gas filling device technical field, specifically is a kind of pneumatic control valve for liquid filling gun. BACKGROUND

[0002] LNG (Liquefied Natural Gas), the English abbreviation of liquefied natural gas. Natural gas is the combustible gas that is naturally exploited in gas field, mainly by methane. LNG is through the gaseous natural gas cooling to-162 DEG C at normal pressure, and it is condensed into liquid. Natural gas liquefied can greatly save storage space, and has the characteristics of high calorific value, high performance.

[0003] Natural gas is more and more favored as clean energy, many countries list LNG as the first choice fuel, and the proportion of natural gas in energy supply is rapidly increasing. Liquefied natural gas is growing at a rate of about 12% per year, becoming one of the fastest growing energy industries in the world.

[0004] In the process of LNG filling, filling gun is generally used for filling, and the traditional filling gun structure is relatively complex, and it is troublesome to fill, exhaust and retreat gun, and the staff is also relatively complex to operate.

[0005] In the prior art, LNG liquid filling gun is manually operated, when filling LNG vehicle, the operator connects the liquid filling gun with the gas filling port on the LNG vehicle, then rotates the handle forward, i.e. along the direction of the gas filling port, and locks the liquid filling gun on the gas filling port, at the same time, the liquid filling gun channel is connected with the gas filling port, and the LNG liquid filling to the LNG vehicle is started through the liquid filling gun channel; after filling, the operator rotates the handle back to the initial state, and presses the handle back to open the pawl to release the gas filling port, pulls out the liquid filling gun, and separates the liquid filling gun from the gas filling port, and the liquid filling operation is completed.

[0006] However, the existing LNG liquid filling gun mainly has the following defects:

[0007] (1) When filling, the liquid filling gun locking action and the filling action are performed at the same time, so that the liquid filling gun is easily ejected due to the filling action when the pawl is not completely locked to the gas filling port, threatening the personal safety of the filling operator.

[0008] (2) When the gun is retreated, the liquid filling gun is ejected due to the simultaneous action of the liquid filling gun pushing out and the pawl releasing the gas filling port, threatening the personal safety of the filling operator.

[0009] (3) in the existing LNG filling gun filling and the process of withdrawing the gun, all the operations need manual operation, the labor intensity of the operator is big. Practical new type content

[0010] Therefore, in order to solve the above problems, the utility model provides a kind of pneumatic control valve for liquid filling gun, the pneumatic control valve is installed on the execution component of LNG filling gun, LNG filling gun can be locked first and then filled when filling, and it can be depressurized first and then withdrawn after filling, which can be operated according to the sequence, effectively prevent filling and locking or depressurizing and withdrawing at the same time, which may cause the liquid filling gun to pop out, and ensure the safety of operation.

[0011] The utility model is realized, construct a kind of pneumatic control valve for liquid filling gun, including gun body, the inside of gun body is provided with liquid filling pipe, one end of liquid filling pipe corresponds with valve core, the other end of liquid filling pipe is connected with driving mechanism and keeps the combination and separation with valve core by driving mechanism, first reset spring is also provided between liquid filling pipe and valve core, liquid inlet pipe is connected to the inclined outer side of liquid filling pipe, the gun body is also hinged with dog, one end of dog is connected with gun body by support sleeve, dog is driven to realize clamping by driving mechanism, pneumatic control structure is provided on the upper end of driving mechanism, the valve core movement of dog is driven by driving mechanism respectively by liquid filling sequence starting driving mechanism of the pneumatic control structure, the liquid filling sequence is clamping, filling, depressurization and withdrawal, through the operation sequence, liquid filling gun is integrated in three steps of liquid filling, depressurization and withdrawal and sequentially controlled.

[0012] The movement of the pneumatic control structure is controlled by the liquid filling sequence, and then the dog and the valve core are moved in sequence according to the driving mechanism, so that the pneumatic liquid filling gun is locked first, then filled, and then depressurized after filling, and then withdrawn.

[0013] Further, the pneumatic control structure specifically includes a box body, a connecting block and a control rod, the box body has a receiving cavity with both ends open, a gas inlet hole is formed in the side end of the box body, the gas inlet hole is communicated with the receiving cavity through a gas inlet channel, an exhaust hole is formed in the opposite side end of the box body, the exhaust hole is communicated with the receiving cavity through an exhaust channel, and a fixing hole is also formed in the box body.

[0014] Further, the connecting block is connected with the open end of the box body through a connecting hole formed in the side end, and a limiting hole is also formed in the connecting block.

[0015] Further, one end of the control rod is inserted into the box through the connecting block, a plurality of first protrusions are arranged on the part of the control rod inserted into the accommodating cavity of the box, the diameters of the first protrusions correspond to the inner diameter of the accommodating cavity, a second protrusion is arranged on the control rod inserted into the limiting hole of the connecting block, the accommodating cavity is divided into a plurality of areas by the first protrusions on the control rod, and the communication and disconnection between the areas of the accommodating cavity and the air inlet channel are realized by the movement of the control rod relative to the box and the connecting block.

[0016] Further, the driving mechanism comprises a cylinder body, a first piston and a second piston are arranged in the cylinder body, the first piston and the second piston divide the cylinder body into a first area, a second area and a third area, the second piston is connected with the liquid filling pipe and is used for pushing the linear movement of the liquid filling pipe, and the first piston drives the linear movement of the driving mechanism.

[0017] Further, the driving mechanism is connected with the pneumatic control mechanism through a connecting plate, three air holes are further arranged in the accommodating cavity of the box, the connecting plate is provided with a first communication hole, a second communication hole and a third communication hole which are connected with the three air holes, and the first communication hole, the second communication hole and the third communication hole are connected with the first area, the second area and the third area of the cylinder body respectively.

[0018] Through the above arrangement, the communication and disconnection between the areas of the accommodating cavity and the air inlet pipe can be changed by the linear movement of the control rod in the box, high-pressure air enters the areas of the cylinder body in sequence, and then the movement of the pawl and the valve core in sequence is realized, so that the simultaneous movement of the pawl and the valve core is prevented, the gun body is prevented from being separated from the filling opening, and a safety accident is prevented.

[0019] Further, the outer end of the driving mechanism is further provided with a hand-held rod.

[0020] Further, one end of the pawl is hook-shaped, the liquid filling opening outside is clamped and fixed through the hook-shaped structure, the middle part of the pawl is hingedly connected with the gun body through a pin shaft, and the other end of the pawl is connected with the supporting sleeve through a hinged plate.

[0021] Further, one end of the pawl is hook-shaped, the liquid filling opening outside is clamped and fixed through the hook-shaped structure, the middle part of the pawl is hingedly connected with the gun body through a pin shaft, and the other end of the pawl is connected with the supporting sleeve through a hinged plate.

[0022] Further, the gun body is connected with the driving mechanism.

[0023] Through the above connection mode, the movement of the pawl and the valve core can be realized through the movement of the two pistons in the driving mechanism, so that the whole filling process such as locking, filling, pressure relief and gun retreat is realized.

[0024] This utility model has the following beneficial effects:

[0025] This pneumatic liquid dispensing gun, through its internal pneumatic control structure, ensures that the jaws and valve core move under the control of the air source, thereby achieving automatic movement of the jaws and valve core and reducing the labor intensity of operators. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a front view schematic diagram of the present invention;

[0028] Figure 3 This is a side view of the present invention;

[0029] Figure 4 This is a top view of the present invention;

[0030] Figure 5 This is a bottom view of the present invention;

[0031] Figure 6 yes Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0032] Figure 7 yes Figure 3 Schematic diagram of the cross-sectional structure of BB;

[0033] Figure 8 This is a schematic diagram showing the connection between the present invention and the execution component;

[0034] Figure 9 yes Figure 8 A magnified view of part of C;

[0035] Figure 10 yes Figure 9 A schematic diagram of the structure for ventilation (the arrows in the diagram indicate the direction of gas flow);

[0036] In the diagram: 1. Housing; 1.1. Fixing hole; 1.2. Exhaust hole; 1.3. Vent hole; 1.4. Exhaust passage; 1.5. Intake hole; 1.6. Intake passage; 1.7. Receiving cavity; 2. Connecting block; 2.1. Connecting hole; 2.2. Limiting hole; 3. Control rod; 3.1. First protruding ridge; 3.2. Second protruding ridge; 4. Connecting plate; 4.1. First connecting hole; 4.2. Second connecting hole; 4.3. Third connecting hole; 5. Cylinder; 5.1. First area; 5.2. Second area; 5.3. Third area; 6. First piston; 7. Second piston; 8. Drive component. Detailed Implementation

[0037] The following will be combined with the appendixFigures 1-10 This utility model is described in detail to address the problem that most existing LNG filling guns described above are manual filling guns, which are laborious to use and may detach from the filling gun and cause injury to workers during the filling process due to the simultaneous locking, filling, depressurization and retraction of the gun.

[0038] This utility model provides an improved pneumatic control valve for a liquid dispensing gun, which can be implemented as follows: A pneumatic control valve for a liquid dispensing gun includes a control element. The control element has a cavity and maintains communication with an external air source. The cavity within the control element is divided into multiple regions, and each region can be connected to and disconnected from the external air source. The cavity regions inside the control element are connected to and disconnected from the external air source according to an operating sequence, which is the operating sequence when the liquid dispensing gun is adding liquid. Through this operating sequence, the three steps of liquid dispensing, pressure relief, and gun retraction are integrated into one unit and sequentially and continuously controlled.

[0039] As attached Figure 6 Or attached Figure 7 As shown, in this embodiment, the control element specifically includes a housing 1, a connecting block 2, and a control rod 3. The housing 1 has a receiving cavity 1.7 and is open at both ends. The connecting block 2 is respectively disposed at the openings at both ends of the housing 1. The control rod 3 passes through the connecting block 2 and is inserted into the receiving cavity 1.7 of the housing 1 to remain movable.

[0040] In this embodiment, a fixing hole 1.1 is provided on the housing 1, and an air inlet 1.5 is provided on the side end of the housing 1. The air inlet 1.5 is connected to the receiving cavity 1.7 through an air inlet channel 1.6. An exhaust hole 1.2 is provided on the opposite side end of the housing 1 where the air inlet 1.5 is provided, and the exhaust hole 1.2 is connected to the receiving cavity 1.7 through an exhaust channel 1.4.

[0041] Combined with appendix Figure 1 and attached Figure 6 Or attached Figure 7 As shown, in this embodiment, the connecting block 2 is connected to the open end of the housing 1 through the connecting hole 2.1 opened on the side end, and a limiting hole 2.2 is also provided in the connecting block 2.

[0042] As attached Figure 6 Or attached Figure 7As shown in the drawings, in the present embodiment, a plurality of first protrusions 3.1 are arranged on the part of the control rod 3 inserted into the accommodating cavity 1.7 of the box body 1, the diameters of the first protrusions 3.1 correspond to the inner diameter of the accommodating cavity 1.7, and a second protrusion 3.2 is arranged on the part of the control rod 3 inserted into the limiting hole 2.2 of the connecting block 2, the accommodating cavity 1.7 is divided into a plurality of regions by the first protrusions 3.1 on the control rod 3, and the communication and disconnection between the regions of the accommodating cavity 1.7 and the air inlet channel 1.6 are realized by the movement of the control rod 3 relative to the box body 1 and the connecting block 2.

[0043] When the staff pulls or pushes the control rod 3 to move inside the box body 1, if the first protrusion 3.1 is located at the communication part of the air inlet channel 1.6 and the accommodating cavity 1.7, a certain jerk will be generated, and the lock, filling, pressure relief and gun withdrawal can be prevented from being simultaneously performed to cause the liquid filling gun to fall off.

[0044] In the present embodiment, the pneumatic control valve further comprises an execution element, which is connected with the control element and realizes different execution operations by the communication and disconnection between the regions of the control element and the external air source.

[0045] As shown in the drawings, Figure 8 and the drawings, Figure 9 As shown in the drawings, in the present embodiment, the execution element comprises a cylinder body 5, which is internally provided with a first piston 6 and a second piston 7, the second piston 7 is connected with a driving element 8 for pushing the driving element 8 to move linearly, the first piston 6 drives the execution element to move linearly, and the first piston 6 and the second piston 7 divide the cylinder body 5 into a first region 5.1, a second region 5.2 and a third region 5.3.

[0046] In the present embodiment, the execution element is connected with the control element through a connecting plate 4, three exhaust holes 1.3 are further arranged in the cavity of the control element, the connecting plate 4 is provided with a first communication hole 4.1, a second communication hole 4.2 and a third communication hole 4.3 which are in communication with the three exhaust holes 1.3, and the first communication hole 4.1, the second communication hole 4.2 and the third communication hole 4.3 are respectively in communication with the first region 5.1, the second region 5.2 and the third region 5.3 of the execution element.

[0047] As shown in the drawings, Figure 6 , the drawings, Figure 7 , the drawings, Figure 8 , the drawings, Figure 9 , the drawings, Figure 10 It can be seen that the control method of the pneumatic control valve is as follows

[0048] The operator pushes the control lever 3 to move into the box 1, when the first jerk is generated, the first ridge 3.1 blocks any one of the air inlet channels 1.6, and continues to push the control lever 3 to keep the first ridge 3.1 separated from the air inlet channel 1.6 (state as shown in the attached Figure 6 ), at this time, the first ridge 3.1 at the end (shown as the right end in the figure) and the adjacent first ridge 3.1 are communicated with the air inlet channel 1.6, while the opposite first ridge 3.1 at the end (the left end) and the adjacent first ridge 3.1 are blocked from the air inlet channel, and the high-pressure gas is added into the box 1 through the air inlet hole 1.5, the gas enters the containing cavities 1.7 of the first ridge 3.1 at the end (the right end) and the adjacent first ridge 3.1 and the first ridge 3.1 at the middle part, and then passes through the air holes 1.3 and the second communication holes 4.2 and the third communication holes 4.3 corresponding to the positions, and enters the second area 5.2 and the third area 5.3, since the first area 5.1 corresponding to the first ridge 3.1 is not communicated with the air inlet channel 1.6, the air pressure in the first area 5.1 is lower than that in the second area 5.2 and the third area 5.3, and then the first piston 6 is pushed to move to one end under the action of the air pressure difference, and then drives the execution element to move, and after being combined with the external liquid adding gun, the liquid adding gun is locked with the filling port of the automobile, and the filling of natural gas is facilitated.

[0049] Then the operator pushes the control lever 3 into the box 1 again according to the locking condition, and the movement mode is as described above, which will not be repeated here, and finally the second piston 7 and the driving element 8 are pushed to move outward to realize the filling.

[0050] The remaining pressure relief and gun withdrawal operations can be completed by sequentially pulling out the control lever 3 outward.

[0051] The above description is a detailed description of the preferred and feasible embodiments of the utility model, but the embodiments are not used to limit the patent application range of the utility model, and any equivalent changes or modified changes completed under the technical spirit of the utility model should belong to the patent range covered by the utility model.

Claims

1. A pneumatically controlled valve for a liquid adding gun, characterized by: The control element has a cavity inside and keeps the cavity in communication with an external air source, the cavity inside the control element is divided into multiple areas and keeps each area in communication with and disconnected from the external air source, the cavity areas inside the control element are in communication with and disconnected from the external air source in an operation sequence, which is the operation sequence when the liquid filling gun fills liquid, through the operation sequence, the liquid filling gun is integrated and sequentially controlled in three steps of liquid filling, pressure relief and gun withdrawal. The control element specifically comprises a box body (1), the box body (1) forms a cavity by an internal containing cavity (1.7) and keeps both ends of the box body (1) open; a connecting block (2) is arranged at each open end of the box body (1); and a control rod (3) is inserted into the containing cavity (1.7) of the box body (1) through the connecting block (2) and kept movable; a plurality of first ribs (3.1) are arranged on the part of the control rod (3) inserted into the containing cavity (1.7) of the box body (1), the diameter of the first ribs (3.1) corresponds to the inner diameter of the containing cavity (1.7), the containing cavity (1.7) is divided into multiple areas by the first ribs (3.1) on the control rod (3), and the communication and disconnection between each containing cavity (1.7) and the external air source are realized by the movement of the control rod (3) relative to the box body (1) and the connecting block (2).

2. The pneumatically operated control valve for a liquid charging gun according to claim 1, characterized in that: A fixing hole (1.1) is arranged on the box body (1), an air inlet hole (1.5) is arranged at the side end of the box body (1), the air inlet hole (1.5) is in communication with the containing cavity (1.7) through an air inlet channel (1.6), an air outlet hole (1.2) is arranged at the opposite side end of the box body (1), and the air outlet hole (1.2) is in communication with the containing cavity (1.7) through an air outlet channel (1.4).

3. The pneumatically controlled valve for a liquid charging gun according to claim 2, characterized in that: The connecting block (2) is connected with the open end of the box body (1) through a connecting hole (2.1) arranged at the side end, and a limiting hole (2.2) is further arranged in the connecting block (2).

4. The pneumatically controlled valve for a liquid charging gun according to claim 3, characterized in that: A second rib (3.2) is arranged in the limiting hole (2.2) of the connecting block (2) into which the control rod (3) is inserted.

5. The pneumatically operated control valve for a liquid charging gun according to claim 1, characterized in that: An execution element is further arranged, which is connected with the control element and realizes different execution operations through the communication and disconnection between each cavity area inside the control element and the external air source.

6. The pneumatically operated control valve for a liquid charging gun according to claim 5, characterized in that: The execution element comprises a cylinder body (5), a first piston (6) and a second piston (7) are arranged inside the cylinder body (5), the second piston (7) is connected with a driving member (8) for driving the driving member (8) to move linearly, the first piston (6) drives the execution element to move linearly, and the first piston (6) and the second piston (7) divide the cylinder body (5) into a first area (5.1), a second area (5.2) and a third area (5.3).

7. The pneumatically operated control valve for a liquid charging gun according to claim 5, characterized in that: The execution element is connected with the control element through a connecting plate (4), three air holes (1.3) are further arranged in the cavity of the control element, the connecting plate (4) is provided with a first communicating hole (4.1), a second communicating hole (4.2) and a third communicating hole (4.3) which are communicated with the three air holes (1.3), and the first communicating hole (4.1), the second communicating hole (4.2) and the third communicating hole (4.3) are respectively communicated with the first region (5.1), the second region (5.2) and the third region (5.3) of the execution element.

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