Buffer tank for standard gas filling

Abstract

The utility model discloses a standard gas filling buffer tank which comprises a tank body, an end cover used for sealing an inner cavity of the tank body is arranged at one end of the tank body, a gas filling pipe is arranged at the end of the tank body, a gas bag and a piston are sequentially arranged on the side, located on the end cover, of the inner cavity of the tank body, and the gas bag expands to fill the inner cavity of the tank body and pushes the piston to slide in the inner cavity of the tank body. The other end of the tank body is provided with an air inlet pipe used for conveying standard gas to the inner cavity of the tank body, and the outer wall of the air inlet pipe is provided with an exhaust pipe used for exhausting air in the inner cavity of the tank body. According to the buffer tank, the inner cavity of the tank body can be filled with the air bag and the piston, air at dead corners of the inner cavity of the tank body is removed, air in the inner cavity of the tank body is completely emptied, air residues in the inner cavity of the tank body are prevented, and the situation that the air residues in the inner cavity of the tank body are mixed with standard gas is avoided; and the purity of the standard gas is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to buffer tank technical field, concretely relates to a buffer tank for standard gas filling. BACKGROUND

[0002] Standard gas is a specific gas mixture containing known concentration, mainly used for calibrating instrument, evaluating measurement method and giving value to matter, with high stability, uniformity and accuracy, while buffer tank is a device playing a buffering role in standard gas filling process, which can relieve pressure fluctuation in the filling process, ensure the smooth process of standard gas filling, thereby guaranteeing the quality and stability of standard gas.

[0003] However, since there is air in the buffer tank, in order to ensure the purity of standard gas, most of the existing standard gas filling methods introduce excess standard gas into the buffer tank, so that the standard gas fills in the buffer tank to exclude other gases, and the standard gas is filled by using this method, which consumes a large amount of standard gas, causing waste of standard gas. Therefore, the technical personnel in the art provide a buffer tank for standard gas filling to solve the problems raised in the above background art. SUMMARY

[0004] The utility model aims at providing a buffer tank for standard gas filling to solve the problems raised in the above background art.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A buffer tank for standard gas filling, comprising: a tank body, one end of the tank body is provided with an end cover for closing the inner cavity thereof, the end of the tank body is provided with a gas filling pipe, and the inner cavity of the tank body is provided with a gas bag and a piston in sequence on one side of the end cover, the gas bag expands to fill the inner cavity of the tank body and pushes the piston to slide in the inner cavity thereof, the gas inlet of the gas bag is communicated with the gas filling pipe, the other end of the tank body is provided with a gas inlet pipe for delivering standard gas to the inner cavity thereof, and the outer wall of the gas inlet pipe is provided with a gas outlet pipe for discharging air inside the inner cavity of the tank body.

[0007] Preferably, the end of the gas filling pipe located outside the end cover is provided with a first stop valve, and the first stop valve is used for controlling the opening and closing of the gas filling pipe.

[0008] Preferably, the outer wall of the gas inlet pipe is provided with a second stop valve on the side of the gas outlet pipe away from the tank body, and the second stop valve is used for controlling the opening and closing of the gas inlet pipe.

[0009] Preferably, the outer wall of the gas outlet pipe is provided with a third stop valve, and the third stop valve is used for controlling the opening and closing of the gas outlet pipe.

[0010] Preferably, the two ends of the piston are provided with arc-shaped filling blocks, and the two arc-shaped filling blocks are filled in the arc-shaped portions of the inner cavities of the tank body and the end cover respectively.

[0011] Preferably, a threaded lug is arranged on the outer portion of the opening of the inner cavity of the end face of the tank body, a threaded groove is arranged at the position corresponding to the threaded lug on the end face of the end cover, the threaded lug is screwed into the inner portion of the threaded groove, and the inner cavity bottom of the threaded groove is provided with a second sealing gasket, and one end of the threaded lug located in the inner portion of the threaded groove is tightly pressed against the end face of the second sealing gasket.

[0012] Preferably, the end face of the tank body is provided with a first sealing gasket on both the inner and outer sides of the threaded lug, and the end cover is tightly attached to the end face of the tank body through the first sealing gasket.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] By arranging the piston and the air bag, when the buffer tank is used, nitrogen can be introduced into the air bag through the inflation pipe to make the air bag expand and fill in the inner cavity of the tank body, and then the expanded air bag pushes the piston to slide in the inner cavity of the tank body, pushes the air in the inner cavity of the tank body to move to the air inlet pipe, and is discharged from the air outlet pipe connected with the air inlet pipe, and then the standard gas is introduced into the inner cavity of the tank body through the air inlet pipe, so that the filling of the standard gas is completed, the air bag and the piston are filled in the inner cavity of the buffer tank, the air in the dead angle of the inner cavity of the buffer tank is removed, the air in the inner cavity of the tank body is completely emptied, air residue in the inner cavity of the tank body is prevented, the situation that excessive standard gas needs to be introduced into the buffer tank to remove other gases in the tank body is avoided, the trouble that the standard gas is mixed with air residue in the inner cavity of the tank body is avoided, the waste of the standard gas is reduced, the purity of the standard gas is ensured, and the use effect of the buffer tank is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the buffer tank according to an embodiment of the utility model;

[0016] Figure 2 It is a sectional view of the buffer tank according to an embodiment of the utility model;

[0017] Figure 3 It is a perspective view of the piston according to an embodiment of the utility model;

[0018] Figure 4 It is Figure 2 It is an enlarged view of the A part.

[0019] In the figure: 1, the tank body; 101, threaded support ear; 102, the first sealing pad; 11, end cover; 111, threaded groove; 112, the second sealing pad; 12, inflation tube; 121, the first stop valve; 13, air bag; 14, piston; 141, arc-shaped filling block; 15, air inlet pipe; 151, the second stop valve; 16, exhaust pipe; 161, the third stop valve. DETAILED DESCRIPTION

[0020] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more. In addition, the term "includes" and any variation thereof is intended to cover non-exclusive inclusion.

[0021] Combination Figures 1-4 As shown, one end of the tank body 1 is provided with an end cover 11 for closing the inner cavity thereof, the end of the tank body 1 is provided with an inflation tube 12, and the inner cavity of the tank body 1 is sequentially provided with an air bag 13 and a piston 14 on one side of the end cover 11, the air bag 13 expands to fill the inner cavity of the tank body 1 and pushes the piston 14 to slide in the inner cavity thereof, the air inlet of the air bag 13 is communicated with the inflation tube 12, the other end of the tank body 1 is provided with an air inlet pipe 15 for delivering standard gas to the inner cavity thereof, and the outer wall of the air inlet pipe 15 is provided with an exhaust pipe 16 for discharging the air inside the inner cavity of the tank body 1.

[0022] In one embodiment, when the air in the buffer tank is exhausted, the first stop valve 121 can be opened, nitrogen gas is introduced into the air bag 13 and the inner cavity of the tank body 1 through the inflation tube 12, the air bag 13 is inflated to fill the inner cavity of the tank body 1, the piston 14 is pushed to slide in the inner cavity of the tank body 1 by the inflated air bag 13, the air inside the inner cavity of the tank body 1 is moved to the air inlet pipe 15, and at the same time, the third stop valve 161 is opened again. The air entering the air inlet pipe 15 is discharged from the exhaust pipe 16 communicated therewith, so that the air exhausting operation in the inner cavity of the buffer tank is completed, the air in the inner cavity of the tank body 1 can be exhausted, and the mixing of the standard gas with the air in the inner cavity of the tank body 1 is avoided, so that the purity of the standard gas is ensured.

[0023] In one embodiment, when the standard gas is filled into the buffer tank, the piston 14 can slide in the inner cavity of the tank body 1 under the pressure of the standard gas, extrude the gas bag 13, discharge the nitrogen in the inner cavity of the tank body 1 and the gas bag 13 on the other side of the piston 14 to the outside of the buffer tank, increase the storage space of the standard gas in the buffer tank, and reduce the pressure of the standard gas in the buffer tank, thereby achieving the effect of pressure stabilization and unloading.

[0024] In one embodiment, since the inflation pipe 12 introduces nitrogen into the inner cavity of the tank body 1 and the gas bag 13, when the gas bag 13 is used to push the piston 14 to displace, the nitrogen delivered through the inflation pipe 12 can supplement the air in the inner cavity of the tank body 1, thereby avoiding the situation that the gas bag 13 cannot push the piston 14 to displace due to the fixed air flow in the inner cavity of the tank body 1, and ensuring the use of the piston 14.

[0025] In one embodiment, when the end cover 11 is installed, the end cover 11 can be screwed on the end face of the tank body 1 to close the inner cavity thereof through the cooperation of the threaded lug 101 and the threaded groove 111, and then the end cover 11 and the threaded lug 101 can extrude the first sealing gasket 102 and the second sealing gasket 112, respectively, so that the gap between the end cover 11 and the tank body 1 is sealed by the first sealing gasket 102 and the second sealing gasket 112, thereby preventing the gap between the end cover 11 and the tank body 1, and ensuring the sealing of the tank body 1.

[0026] In one embodiment, when the piston 14 is worn, the end cover 11 on the tank body 1 can be disassembled through the cooperation of the threaded lug 101 and the threaded groove 111, and then air can be introduced into the inner cavity of the tank body 1 through the air inlet pipe 15, so that the air enters the inner cavity of the tank body 1 to push the piston 14 to move in the inner cavity of the tank body 1, and the piston 14 is pushed to the outside of the tank body 1 and separated therefrom, that is, the piston 14 can be disassembled and replaced, which is simple in structure, convenient to disassemble and assemble, and conducive to the maintenance work.

[0027] The working principle of the utility model is: when the standard gas is filled into the buffer tank, the first stop valve 121 can be opened, nitrogen is introduced into the inner cavity of the tank body 1 through the inflation pipe 12 and the air bag 13, the air bag 13 is inflated and filled in the inner cavity of the tank body 1, the piston 14 is pushed to slide in the inner cavity of the tank body 1 by the inflated air bag 13, the arc-shaped filling block 141 on the piston 14 is filled in the arc-shaped part of the inner cavity of the tank body 1 and is attached to the inner wall of the arc-shaped part, the air in the inner cavity of the tank body 1 is pushed to move into the air inlet pipe 15, at the same time, the third stop valve 161 is opened again, the air in the air inlet pipe 15 is discharged from the exhaust pipe 16 connected with the air inlet pipe 15, the emptying operation of the air in the inner cavity of the buffer tank is completed, the first stop valve 121 and the third stop valve 161 are closed, the second stop valve 151 is opened, the standard gas is introduced into the inner cavity of the tank body 1 through the air inlet pipe 15, the filling of the standard gas is completed, the air bag 13 and the piston 14 can be filled in the inner cavity of the buffer tank, the air in the dead angle of the inner cavity of the buffer tank is removed, the air in the inner cavity of the buffer tank is completely emptied, the air residue in the inner cavity of the buffer tank is prevented, not only the situation that the excessive standard gas needs to be introduced into the buffer tank to remove other gases in the tank body 1 is avoided, but also the trouble that the air residue in the inner cavity of the tank body 1 is mixed with the standard gas is avoided, the waste of the standard gas is reduced, the purity of the standard gas is ensured, and the use effect of the buffer tank is improved.

[0028] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A buffer tank for standard gas filling, characterized by, The utility model relates to a kind of gas cylinder, including: Tank body (1), one end of the tank body (1) is provided with end cover (11) for closing its inner cavity, the end of the tank body (1) is provided with inflation pipe (12), and the inner cavity of the tank body (1) is located one side of the end cover (11) is sequentially provided with air bag (13), piston (14), the air bag (13) is inflated and fills the inner cavity of the tank body (1) and pushes the piston (14) to slide in its inner cavity, and the air inlet of the air bag (13) is communicated with the inflation pipe (12), the other end of the tank body (1) is provided with air inlet pipe (15) for conveying standard gas to its inner cavity, the outer wall of the air inlet pipe (15) is provided with exhaust pipe (16) for discharging the air inside the inner cavity of the tank body (1).

2. The buffer tank for standard gas filling according to claim 1, characterized by The inflation pipe (12) is provided with first stop valve (121) at one end outside the end cover (11), and the first stop valve (121) is used to control the opening and closing of the inflation pipe (12).

3. The buffer tank for standard gas filling according to claim 1, characterized in that, The outer wall of the air inlet pipe (15) is provided with second stop valve (151) on the side of the exhaust pipe (16) away from the tank body (1), and the second stop valve (151) is used to control the opening and closing of the air inlet pipe (15).

4. The buffer tank for standard gas filling according to claim 1, characterized by The outer wall of the exhaust pipe (16) is provided with third stop valve (161), and the third stop valve (161) is used to control the opening and closing of the exhaust pipe (16).

5. The buffer tank for standard gas filling according to claim 1, characterized by Both ends of the piston (14) are provided with arc-shaped filling blocks (141), and the two arc-shaped filling blocks (141) are filled in the arc-shaped part of the inner cavity of the tank body (1) and the end cover (11) respectively.

6. The buffer tank for standard gas filling according to claim 1, characterized by The end surface of the tank body (1) is provided with threaded lug (101) around the opening of its inner cavity, the end surface of the end cover (11) is provided with threaded groove (111) at the position corresponding to the threaded lug (101), the threaded lug (101) is screw-mounted inside the threaded groove (111), and the inner cavity bottom of the threaded groove (111) is provided with second sealing gasket (112), and one end of the threaded lug (101) inside the threaded groove (111) is tightly pressed against the end surface of the second sealing gasket (112).

7. The buffer tank for standard gas filling according to claim 6, characterized in that, The end surface of the tank body (1) is provided with first sealing gasket (102) on both the inner and outer sides of the threaded lug (101), and the end cover (11) is tightly attached to the end surface of the tank body (1) through the first sealing gasket (102).

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