Charging gun

Abstract

The application discloses a filling gun, which comprises a lower straight pipe, a filling port arranged at the bottom of the lower straight pipe, a three-way cavity, a pressure compensation cavity and a valve rod. The bottom of the three-way cavity is connected with the lower straight pipe, and the side wall of the three-way cavity is connected with a filling pipe. The pressure compensation cavity is connected with the three-way cavity. The valve rod comprises a main rod and a connecting rod. The connecting rod is connected with the lower end of the main rod. The main rod passes through the three-way cavity and the pressure compensation cavity. The connecting rod is arranged in the lower straight pipe. A valve head is connected with the lower end of the connecting rod. The valve head can be in sealing connection or open with the filling port of the lower straight pipe. The filling gun can reduce the pressure difference between the inside and outside of the sealing pipe through the pressure compensation port when the main rod moves downward to control the valve head. The upper end of the sealing pipe moves synchronously with the main rod without sliding friction. The pressure borne by the sealing pipe due to the operation of the filling gun is reduced, and the service life of the sealing pipe is prolonged.

Description

Technical Field

[0001] This invention relates to the field of filling equipment, and in particular to a filling gun. Background Technology

[0002] During the filling process, the filling equipment requires a filling gun to complete the final filling of the material. Since the filling gun needs to be opened and closed by a control valve, and the control valve adopts a long rod structure, the valve stem of the control valve and the sealing element adopt a sliding seal during the extension and retraction process. This not only creates frictional resistance, but also places higher demands on the sealing of the filling gun, resulting in a higher cost for the filling gun. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a filling gun in which the valve stem of the control valve does not rub against the filling gun, thereby solving the problems of frictional obstruction and poor sealing of the filling gun.

[0004] To solve the above-mentioned technical problems, the present invention provides a filling gun, comprising:

[0005] The lower straight pipe has a filling port at the bottom.

[0006] The three-way cavity is connected at the bottom to the lower straight pipe and at the side wall to the filling pipe.

[0007] The pressure compensation chamber is connected to the three-way chamber.

[0008] The valve stem includes a main stem and a connecting rod. The connecting rod is connected to the lower end of the main stem. The main stem passes through the three-way cavity and the pressure compensation cavity. The connecting rod is located in the lower straight pipe.

[0009] The valve head is connected to the lower end of the connecting rod, and the valve head can be sealed or opened between the valve head and the filling port of the lower straight pipe;

[0010] The main rod is slidably and sealed to the upper end of the pressure compensation chamber via a first guide washer. A retractable sealing tube is provided within the pressure compensation chamber and is sleeved on the main rod. The top of the sealing tube is fixed and sealed to the outer wall of the main rod, and the bottom of the sealing tube is clamped and sealed by the pressure compensation chamber and the three-way cavity. Thus, the sealing tube divides the space within the pressure compensation chamber into two chambers: a cylindrical first pressure chamber formed by the main rod, the connecting rod, the lower straight tube, and the sealing tube, which serves as the working chamber; and a second pressure chamber used to compensate for the pressure in the working chamber.

[0011] A pressure compensation port is provided on the pressure compensation chamber. When the volume of the first pressure chamber increases, the pressure is pressurized into the first pressure chamber through the pressure compensation port to reduce the pressure difference between the first pressure chamber and the second pressure chamber.

[0012] The pressure compensation port is equipped with a pressure valve. When the main rod moves downward, pressure is supplied to the pressure compensation chamber through the pressure valve.

[0013] A second guide washer is provided at the top of the three-way cavity. The second guide washer has a hole that connects the upper and lower parts to connect the sealing tube and the three-way cavity.

[0014] The sealing tube has a corrugated structure and is made of elastic rubber material.

[0015] The main rod has a necking structure, namely a first section with a larger diameter and a second section with a smaller diameter, wherein the first section is slidably connected to the first guide washer and the second section is slidably connected to the second guide washer; the upper end of the sealing tube is connected to the first section and the second section is located inside the sealing tube.

[0016] The upper end of the sealing tube is provided with a locking ring to lock and fix the sealing tube to the main rod; alternatively, the main rod is provided with a circumferential locking groove so that the locking ring can press the sealing tube into the locking groove.

[0017] The lower end of the sealing tube is clamped and fixed by the pressure compensation cavity and the three-way cavity.

[0018] The pressure compensation chamber has a first top plate at the top and a first bottom plate at the bottom. The central hole of the first top plate has an annular stepped surface for accommodating the first guide washer.

[0019] The three-way cavity has a second top plate at the top and a second bottom plate at the bottom. The second top plate has a through hole for accommodating the second guide washer. The first bottom plate and the second top plate are joined together to clamp and seal the bottom of the sealing tube.

[0020] The filling gun provided by this invention is equipped with a pressure compensation chamber and a retractable sealing tube inside it. The upper end of the sealing tube is sealed to the main rod, and the lower end is sealed to the inner wall of the pressure compensation chamber. This allows the upper end of the sealing tube to move synchronously with the main rod when the control valve head moves downward, preventing sliding friction. At the same time, the pressure compensation chamber reduces the pressure difference between the inside and outside of the sealing tube, thereby reducing the pressure on the sealing tube due to the operation of the filling gun and extending its service life. In addition, the reduced pressure difference between the two sides of the connection between the upper end of the sealing tube and the main rod also reduces the possibility of material entering the pressure compensation chamber. Attached Figure Description

[0021] Figure 1A three-dimensional structural diagram of the filling gun;

[0022] Figure 2 This is a schematic diagram of the internal structure of a filling gun;

[0023] Figure 3 This is a partial cross-sectional view of the filling gun.

[0024] In the picture:

[0025] 10-Lower straight pipe;

[0026] 20-Three-way cavity; 21-Second top plate; 22-Second bottom plate;

[0027] 30-Pressure compensation chamber; 31-First guide washer; 32-Second guide washer; 33-Gap; 35-Pressure compensation port; 36-First top plate; 37-First bottom plate;

[0028] 40 - Valve stem; 41 - Main stem; 42 - Connecting rod;

[0029] 50 - Valve head;

[0030] 60 - Filling tube;

[0031] 70 - Sealing tube; 71 - Locking ring;

[0032] 80-Spring. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] like Figure 1-3 As shown, the filling gun provided by the present invention includes:

[0036] The lower straight pipe 10 has a filling port at the bottom;

[0037] The three-way cavity 20 is connected to the lower straight pipe 10 at its bottom and to the filling pipe 60 on its side wall.

[0038] The pressure compensation chamber 30 is connected to the three-way chamber 20; the diaphragm chamber, the three-way chamber 20 and the lower straight pipe 10 are connected to form a structure.

[0039] The valve stem 40 includes a main stem 41 and a connecting rod 42. The connecting rod 42 is connected to the lower end of the main stem 41. The main stem 41 passes through the three-way cavity 20 and the pressure compensation cavity 30. The connecting rod 42 is located in the lower straight pipe 10.

[0040] The valve head 50 is connected to the lower end of the connecting rod 42, and the valve head 50 can be sealed or opened with respect to the filling port of the lower straight pipe 10.

[0041] The main rod 41 is slidably and sealed to the upper end of the pressure compensation chamber 30 via a first guide washer 31. A retractable sealing tube 70 is provided inside the pressure compensation chamber 30, and the sealing tube 70 is sleeved on the main rod 41. The top of the sealing tube 70 is fixed and sealed to the outer wall of the main rod 41, and the bottom of the sealing tube 70 is clamped and sealed by the pressure compensation chamber 30 and the three-way cavity. Thus, the sealing tube divides the space inside the pressure compensation chamber into two chambers: a cylindrical first pressure chamber formed by the main rod 41, the connecting rod 42, the lower straight tube 10, and the sealing tube, which serves as the working chamber; and a cylindrical second pressure chamber formed by the inner wall of the pressure compensation chamber 30, the sealing tube 70, the main rod 41, and the first guide washer 31, which is used to compensate for the pressure in the working chamber.

[0042] A pressure compensation port 35 is provided on the pressure compensation chamber 30. When the volume of the first pressure chamber increases, the pressure is pressurized into the first pressure chamber through the pressure compensation port to reduce the pressure difference between the first pressure chamber and the second pressure chamber.

[0043] The pressure compensation port 35 is equipped with a pressure valve. When the main rod 41 moves downward, the pressure compensation chamber 30 is pressurized through the pressure valve. Alternatively, the pressure compensation chamber 30 can be pressurized and maintained through the pressure valve to prevent gas leakage. For example, when the maximum working pressure of the working chamber is 1 MPa, the pressure compensation port 30 can be pressurized by 0.5 MPa, so that the pressure that the sealing tube 70 withstands in both working and non-working states is within ±0.5 MPa, thereby significantly improving the service life of the sealing tube 70.

[0044] The gas filled inside the pressure compensation chamber 30 is preferably nitrogen.

[0045] Specifically: In this embodiment, when the valve stem 40 moves downward to open the valve port and the filling gun is working, the pressure compensation chamber 30 is pressurized so that the pressure in the first pressure chamber is greater than the pressure in the second pressure chamber, or the pressure difference between the first pressure chamber and the second pressure chamber is kept within 0.1 MPa. This makes it easier and more accurate to control the opening of the valve port by moving the valve stem downward, and can overcome the reaction of the working pressure on the valve stem sealing tube.

[0046] A second guide washer 32 is provided at the top of the three-way cavity 20. The second guide washer 32 has a hole 33 that connects the upper and lower parts to connect the sealing tube 70 and the three-way cavity 20.

[0047] The sealing tube 70 has a corrugated structure and is made of elastic rubber material.

[0048] The main rod 41 is provided with a necking structure, namely a first section with a larger diameter and a second section with a smaller diameter, wherein the first section is slidably connected to the first guide washer 31 and the second section is slidably connected to the second guide washer 32; the upper end of the sealing tube 70 is connected to the first section, and the second section is located inside the sealing tube 70.

[0049] The upper end of the sealing tube 70 is provided with a locking ring 71, which locks and fixes the sealing tube 70 to the main rod 41. Optionally, the main rod 41 is provided with a circumferential locking groove, so that the locking ring can press the sealing tube into the locking groove. When the pressure inside and outside the sealing tube 70 is high, the sealing effect can be guaranteed.

[0050] The lower end of the sealing tube 70 is clamped and fixed by the pressure compensation cavity 30 and the three-way cavity 20.

[0051] The pressure compensation cavity 30 has a first top plate 36 at the top and a first bottom plate 37 at the bottom. The central hole of the first top plate 36 has an annular stepped surface for accommodating the first guide washer 31. The spring 80 is sleeved on the outside of the main rod 41 at the top of the pressure compensation cavity 30, and the bottom of the spring 80 presses on the first guide washer 31, thereby limiting the position of the first guide coil 31.

[0052] The three-way cavity 20 has a second top plate 21 at the top and a second bottom plate 22 at the bottom. The second top plate 21 has a through hole for accommodating the second guide washer 32. The first bottom plate 37 and the second top plate 21 are connected to clamp and seal the bottom of the sealing tube 70. The sealing tube is clamped and sealed by the first bottom plate and the second top plate, which can improve the sealing effect of the sealing tube and keep the bottom of the sealing tube fixed when under pressure.

[0053] The filling gun provided by this invention is equipped with a pressure compensation chamber 30, and a retractable sealing tube 70 is installed inside the chamber. The upper end of the sealing tube 70 is sealed to the main rod 41, and the lower end is sealed to the inner wall of the pressure compensation chamber 30. This allows the upper end of the sealing tube 70 to move synchronously with the main rod 41 when the main rod 41 moves downward to control the valve head 50, without generating sliding friction. At the same time, the pressure difference between the inside and outside of the sealing tube 70 is reduced through the pressure compensation port, thereby reducing the pressure on the sealing tube 70 due to the operation of the filling gun and extending the service life of the sealing tube 70. In addition, the reduced pressure difference on both sides of the connection between the upper end of the sealing tube 70 and the main rod 41 also reduces the possibility of material entering the pressure compensation chamber 30.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A charging gun characterized by, The utility model relates to a filling gun, which comprises: a lower straight pipe provided with a filling port at the bottom; a three-way cavity connected with the lower straight pipe at the bottom and communicated with the filling pipe through the side wall; a pressure compensation cavity connected with the three-way cavity; a valve rod comprising a main rod and a connecting rod, the connecting rod being connected to the lower end of the main rod, the main rod penetrating through the three-way cavity and the pressure compensation cavity, and the connecting rod being located in the lower straight pipe; a valve head connected to the lower end of the connecting rod and capable of being sealingly connected with or opened from the filling port of the lower straight pipe; wherein the main rod is slidingly and sealingly connected with the upper end of the pressure compensation cavity through a first guide gasket, a retractable sealing pipe is arranged in the pressure compensation cavity and sleeved on the main rod, the top of the sealing pipe is fixedly and sealingly connected with the outer wall of the main rod, and the bottom of the sealing pipe is clamped and sealingly connected with the pressure compensation cavity and the three-way cavity, so that the space in the pressure compensation cavity is divided into two chambers by the sealing pipe, i.e., a cylindrical first pressure chamber formed by the main rod, the connecting rod, the lower straight pipe and the sealing pipe, which serves as a working chamber, and a cylindrical second pressure chamber formed by the inner wall of the pressure compensation cavity, the sealing pipe, the main rod and the first guide gasket, which serves to compensate the pressure of the working chamber; the upper end of the sealing pipe is provided with a locking ring for locking and fixing the sealing pipe and the main rod, and the main rod is provided with a ring-shaped locking groove for allowing the locking ring to press the sealing pipe into the locking groove; the lower end of the sealing pipe is clamped and fixed with the pressure compensation cavity and the three-way cavity; when the valve rod moves downward to open the valve port and the filling gun works, the pressure compensation cavity is filled with pressure, the pressure of the first pressure chamber is greater than that of the second pressure chamber, and the pressure difference between the first pressure chamber and the second pressure chamber is kept within 0.1 Mpa; the pressure compensation cavity is provided with a pressure compensation port, when the volume of the second pressure chamber increases, the second pressure chamber is filled with pressure through the pressure compensation port to reduce the pressure difference between the first pressure chamber and the second pressure chamber.

2. The filling gun according to claim 1, wherein the pressure compensation port is provided with a pressure valve, when the main rod moves downward, the pressure compensation cavity is filled with pressure through the pressure valve.

3. The filling gun according to claim 1, wherein the top of the three-way cavity is further provided with a second guide gasket, the second guide gasket is provided with apertures communicating with each other to communicate the sealing pipe with the three-way cavity.

4. The filling gun according to claim 1, wherein the sealing pipe is a corrugated pipe structure and is made of elastic rubber material.

5. The filling gun according to claim 3, wherein the main rod is provided with a necked structure, i.e., a first section with a larger diameter and a second section with a smaller diameter, the first section is slidingly connected with the first guide gasket, the second section is slidingly connected with the second guide gasket, the upper end of the sealing pipe is connected with the first section, and the second section is located in the sealing pipe.

6. The filling gun according to claim 5, wherein The top of the pressure compensation cavity is provided with a first top plate, and the bottom is provided with a first bottom plate. An annular stepped surface for accommodating a first guide gasket is arranged on the middle hole of the first top plate.

7. The charging gun according to claim 6, wherein, The top of the three-way cavity is provided with a second top plate, and the bottom is provided with a second bottom plate. A through hole for accommodating a second guide gasket is arranged on the second top plate. The first bottom plate and the second top plate are butted and clamp and seal the bottom of the sealing tube.

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