Refrigerant vacuum filling gun

Abstract

The utility model discloses a refrigerant vacuum filling gun which comprises a gun body, a material filling hole channel is arranged in the gun body, the material filling hole channel is communicated with a containing cavity, the containing cavity is located at the discharging end of the gun body, and a clamping mechanism is arranged in the containing cavity. The clamping mechanism comprises a piston, an extrusion sealing ring, a steel ball and a fixing sleeve, the fixing sleeve is fixed to the discharging end of the gun body and used for insertion of a connecting pipe of a refrigerant filling port, and a gap is formed between the fixing sleeve and the side wall of the containing cavity; the piston is cylindrical, a conical surface is arranged on the inner side wall of the end face, close to the discharging end, of the piston, and the conical surface can be inserted into the gap. By the adoption of the technical scheme, the refrigerant vacuum filling gun can automatically lock the connector in a pneumatic mode and is very convenient to use.

Description

Technical Field

[0001] The utility model relates to a refrigerant vacuum filling gun and belongs to the technical field of refrigerant vacuum filling of refrigerants in vehicle refrigeration systems. Background Art

[0002] At present, the refrigerant filling of the vehicle refrigeration system is manually connected to the pipe of the refrigerant filling port through a quick connector. After the filling is completed, the quick connector needs to be manually disconnected from the pipe (the quick connector is connected to the filling gun through a hose). Since the operator needs to manually operate when connecting or disconnecting the quick connector from the pipe, the workload is increased and the production efficiency is reduced. Therefore, it is necessary to design a refrigerant vacuum filling gun that can achieve interface clamping by pneumatic means. Utility Model Content

[0003] Therefore, the purpose of the utility model is to provide a refrigerant vacuum filling gun that can achieve automatic clamping and sealing of the interface in a pneumatic manner.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a refrigerant vacuum filling gun, including a gun body, a material injection channel is arranged in the gun body, the material injection channel is connected to a accommodating chamber, the accommodating chamber is located at the discharge end of the gun body, and a clamping mechanism is arranged in the accommodating chamber; the clamping mechanism includes a piston, an extrusion sealing ring, a steel ball and a fixed sleeve, the fixed sleeve is fixed to the discharge end of the gun body and is used for inserting the connecting pipe of the refrigerant filling port, and a gap is arranged between the fixed sleeve and the side wall of the accommodating chamber; the piston is cylindrical, and the inner side wall of the end face of the piston close to the discharge end is provided with a conical surface, and the conical surface can be inserted into the gap; a through hole is arranged on the side wall of the fixed sleeve, and the position on the connecting pipe corresponding to the through hole is provided. A recessed portion is provided; the steel ball is provided in the through hole, and a part of the steel ball can protrude from the through hole toward the direction of the gap, and the conical surface can squeeze the steel ball so that it moves along the axial direction of the through hole and partially enters the recessed portion; an extrusion sealing ring is provided on the inner side wall of the piston, and the extrusion sealing ring can be pressed on the fixed sleeve to seal the gap; the end face of the piston away from the discharge end is a force-bearing surface, and the part of the accommodating cavity located on the side of the force-bearing surface away from the discharge end is an inflation cavity, and a locking airway is provided on the gun body, one end of the locking airway is connected to the inflation cavity, and the other end is used to connect to an external air source, and the inflation cavity can apply a locking thrust to the force-bearing surface after being inflated.

[0005] A return spring is also arranged in the accommodating cavity. The return spring presses against the piston and can exert a return force on the piston in the opposite direction to the locking thrust.

[0006] An annular first boss portion is arranged on the outer side wall of the piston, and an annular second boss portion is arranged on the inner side wall of the accommodating cavity; the return spring is sleeved on the outer side of the piston, and two ends thereof are respectively pressed against the first boss portion and the second boss portion.

[0007] A fixing ring is arranged at one end of the fixing sleeve away from the piston. The fixing ring abuts against the discharge end and is fixed to the gun body by screws.

[0008] A cylinder is also arranged in the gun body, and a cylinder arm of the cylinder is inserted into the injection channel and can extend downward into the connecting pipe under the action of pneumatic movement to push open the valve core in the connecting pipe.

[0009] The cylinder further comprises a piston chamber, a first air passage and a second air passage arranged in the gun body, the cylinder arm is connected to the cylinder piston located in the piston chamber, and the first air passage and the second air passage are respectively connected to the piston chamber.

[0010] A filling valve and a vacuum valve are also provided on the gun body, and the filling valve and the vacuum valve are connected to the injection channel through a filling channel and a vacuum channel in the gun body respectively.

[0011] By adopting the above technical scheme, during the use of the refrigerant vacuum filling gun of the utility model, first the discharge end is aligned with the connecting pipe of the refrigerant filling port, and the connecting pipe is inserted into the fixed sleeve, and then the air source is turned on to move the piston downward, and the conical surface squeezes the steel ball so that the steel ball enters the recessed portion on the connecting pipe. At the same time, as the piston moves downward, the extrusion sealing ring can be pressed against the fixed sleeve to seal the gap, thereby completing the automatic locking of the interface, which is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0013] Figure 2 It is a top view of the utility model.

[0014] Figure 3 for Figure 2 AA section view in.

[0015] Figure 4 for Figure 2 A partial enlarged view of part B in FIG.

[0016] Figure 5 for Figure 3 CC section view in. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below through the accompanying drawings and specific implementation methods.

[0018] like Figure 1-5 As shown, the utility model provides a refrigerant vacuum filling gun, including a gun body 1, in which an injection channel 2 is arranged, the injection channel 2 is connected to an accommodating chamber 3, the accommodating chamber 3 is located at the discharge end of the gun body 1, and a clamping mechanism is arranged in the accommodating chamber 3.

[0019] The clamping mechanism includes a piston 4, an extrusion sealing ring 5, a steel ball 6 and a fixed sleeve 7. The fixed sleeve 7 is fixed to the discharge end of the gun body 1 and is used for the insertion of the connecting pipe 8 of the refrigerant filling port. A gap 9 is provided between the fixed sleeve 7 and the side wall of the accommodating chamber 3; the piston 4 is cylindrical, and the inner side wall of the end face of the piston 4 close to the discharge end is provided with a tapered surface 41, and the tapered surface 41 can be inserted into the gap 9; a through hole 71 is provided on the side wall of the fixed sleeve 7, and a recessed portion 81 is provided on the connecting pipe 8 at a position corresponding to the through hole 71. In the present embodiment, the recessed portion 81 can be an annular groove.

[0020] The steel ball 6 is disposed in the through hole 71 , and a portion of the steel ball 6 can protrude from the through hole 71 toward the gap 9 . The conical surface 41 can squeeze the steel ball 6 to move along the axial direction of the through hole 71 and partially enter the recessed portion 81 .

[0021] The extrusion sealing ring 5 is arranged on the inner side wall of the piston 4 , and the extrusion sealing ring 5 can be pressed against the fixing sleeve 7 to seal the gap 9 .

[0022] The end face of the piston 4 away from the discharge end is a force-bearing surface 43, and the part of the accommodating chamber 3 located on the side of the force-bearing surface 43 away from the discharge end is an inflation chamber. A locking air channel 10 is provided on the gun body 1, and one end of the locking air channel 10 is connected to the inflation chamber, and the other end is used to connect to an external air source. After the inflation chamber is inflated, a locking thrust can be applied to the force-bearing surface 43.

[0023] A return spring 11 is further arranged in the accommodating chamber 3 . The return spring 11 presses against the piston 4 and can exert a return force on the piston 4 in a direction opposite to the locking thrust.

[0024] In this embodiment, an annular first boss portion 42 is provided on the outer wall of the piston 4, and an annular second boss portion 31 is provided on the inner wall of the accommodating chamber 3; the return spring 11 is sleeved on the outside of the piston 4, and its two ends are respectively pressed against the first boss portion 42 and the second boss portion 31.

[0025] A fixing ring 12 is disposed at one end of the fixing sleeve 7 away from the piston 4 , and the fixing ring 12 abuts against the discharge end and is fixed to the gun body 1 by screws.

[0026] A cylinder is also provided in the gun body 1 , and the cylinder arm 131 of the cylinder is inserted into the injection channel 2 , and can extend downward into the connecting pipe 8 under the action of pneumatic movement to push open the valve core in the connecting pipe 8 .

[0027] The cylinder also includes a piston chamber 132, a first air channel 133 and a second air channel 134 arranged in the gun body 1. The cylinder arm 131 is connected to the cylinder piston 4 located in the piston chamber 132. The first air channel 133 and the second air channel 134 are respectively connected to the piston chamber 132, and are used for external air source to push the cylinder piston 4 to reciprocate.

[0028] A filling valve 14 and a vacuum valve 15 are also provided on the gun body 1 , and the filling valve 14 and the vacuum valve 15 are connected to the injection channel 2 through a filling channel and a vacuum channel in the gun body 1 , respectively.

[0029] By adopting the above technical solution, the refrigerant vacuum filling gun of the utility model is used. First, the discharge end is aligned with the pipe 8 of the refrigerant filling port, and the pipe 8 is inserted into the fixed sleeve 7. Then, the gas source is turned on to move the piston 4 downward, and the conical surface 41 squeezes the steel ball 6, so that the steel ball 6 enters the recessed portion 81 on the pipe 8. At the same time, as the piston 4 moves downward, the extrusion sealing ring 5 can be pressed against the fixed sleeve 7 to seal the gap 9, and the automatic locking of the interface is completed, which is very convenient to use. When the filling is completed, the gas source is turned off, and the piston 4 can be lifted up under the action of the reset spring 11, thereby contact locking, and the gun body 1 can be removed.

[0030] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention of the utility model.

Claims

1. A refrigerant vacuum filling gun, characterized in that: It comprises a gun body, in which a material injection channel is arranged, the material injection channel is connected to a accommodating chamber, the accommodating chamber is located at the discharge end of the gun body, and a clamping mechanism is arranged in the accommodating chamber; the clamping mechanism comprises a piston, an extrusion sealing ring, a steel ball and a fixing sleeve, the fixing sleeve is fixed to the discharge end of the gun body and is used for inserting the connecting pipe of the refrigerant filling port, and a gap is arranged between the fixing sleeve and the side wall of the accommodating chamber; the piston is cylindrical, and the inner side wall of the end face of the piston close to the discharge end is provided with a conical surface, and the conical surface can be inserted into the gap; a through hole is arranged on the side wall of the fixing sleeve, and a recessed portion is arranged at a position corresponding to the through hole on the connecting pipe; the steel ball is arranged The steel ball is in the through hole, and a part of the steel ball can protrude from the through hole toward the direction of the gap, and the conical surface can squeeze the steel ball to make it move along the axial direction of the through hole and partially enter the recessed portion; an extrusion sealing ring is arranged on the inner side wall of the piston, and the extrusion sealing ring can be pressed on the fixed sleeve to seal the gap; the end face of the piston away from the discharge end is the force-bearing surface, and the part of the accommodating cavity located on the side of the force-bearing surface away from the discharge end is the inflation cavity, and a locking airway is arranged on the gun body, one end of the locking airway is connected to the inflation cavity, and the other end is used to connect to an external air source, and the inflation cavity can apply a locking thrust to the force-bearing surface after being inflated.

2. The refrigerant vacuum filling gun according to claim 1, characterized in that: A return spring is also arranged in the accommodating cavity. The return spring presses against the piston and can exert a return force on the piston in the opposite direction to the locking thrust.

3. The refrigerant vacuum filling gun according to claim 2, characterized in that: An annular first boss portion is arranged on the outer side wall of the piston, and an annular second boss portion is arranged on the inner side wall of the accommodating cavity; the return spring is sleeved on the outer side of the piston, and two ends thereof are respectively pressed against the first boss portion and the second boss portion.

4. The refrigerant vacuum filling gun according to any one of claims 1 to 3, characterized in that: A fixing ring is arranged at one end of the fixing sleeve away from the piston. The fixing ring abuts against the discharge end and is fixed to the gun body by screws.

5. The refrigerant vacuum filling gun according to any one of claims 1 to 3, characterized in that: A cylinder is also arranged in the gun body, and a cylinder arm of the cylinder is inserted into the injection channel and can extend downward into the connecting pipe under the action of pneumatic movement to push open the valve core in the connecting pipe.

6. The refrigerant vacuum filling gun according to claim 5, characterized in that: The cylinder further comprises a piston chamber, a first air passage and a second air passage arranged in the gun body, the cylinder arm is connected to the cylinder piston located in the piston chamber, and the first air passage and the second air passage are respectively connected to the piston chamber.

7. The refrigerant vacuum filling gun according to any one of claims 1 to 3, characterized in that: A filling valve and a vacuum valve are also provided on the gun body, and the filling valve and the vacuum valve are connected to the injection channel through a filling channel and a vacuum channel in the gun body respectively.

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