A gas mixing device

Abstract

The utility model discloses a kind of gas mixing devices, it is related to gas mixing technical field, comprising: cylinder, inside being equipped with piston, tail portion is equipped with cylinder cover;Hydraulic push rod, for driving the piston movement is set on the cylinder cover;Air inlet pipe, a plurality of air inlet pipe is arranged on the front end bottom surface of the cylinder, first three-way solenoid valve and gas flow sensor are equipped on the air inlet pipe;Exhaust pipe, on the front end bottom surface of the cylinder, first solenoid valve is equipped on the exhaust pipe;Filling pipe, on the front end bottom surface of the cylinder, second solenoid valve is equipped on the exhaust pipe;Static mixer, connected on the filling pipe, second three-way solenoid valve is equipped on the static mixer outlet end.

Description

Technical Field

[0001] This utility model belongs to the field of gas mixing technology, and specifically relates to a gas mixing device. Background Technology

[0002] Gas mixing equipment is a device used to uniformly mix two or more gases, and it has wide applications in industrial production, laboratory research, and medical gas preparation. Such equipment typically includes a mixing chamber with several inlet pipes for introducing the component gases to be mixed. To ensure thorough and uniform mixing, the mixing chamber usually incorporates a mechanical stirring mechanism (such as impellers or turbines) or a structure designed based on gas flow characteristics (such as baffles). After mixing, the gases are generally extracted from the mixing chamber using suction equipment (such as a vacuum pump or compressor) and injected into a target mixed gas container for storage or use.

[0003] However, existing gas mixing devices of this type have a significant drawback: gas components from previous mixing processes or ambient gases (such as air) inevitably remain inside the mixing chamber. These residual gases can mix with the freshly introduced gas during subsequent mixing of different components or gases requiring high purity, causing contamination. This cross-contamination problem makes it difficult for existing devices to guarantee the high purity of the final mixed gas. Utility Model Content

[0004] In order to overcome the problems existing in the background art, the present invention provides a gas mixing device.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gas mixing device, comprising:

[0006] A cylinder, with a piston inside and a cylinder head at the rear;

[0007] A hydraulic push rod, mounted on the cylinder head, is used to drive the piston to move;

[0008] An intake pipe, several of which are disposed on the front bottom surface of the cylinder, and a first three-way solenoid valve and a gas flow sensor are provided on the intake pipe;

[0009] An exhaust pipe is located on the bottom front end of the cylinder, and a first solenoid valve is provided on the exhaust pipe;

[0010] A filling pipe is located on the bottom front end of the cylinder, and a second solenoid valve is provided on the exhaust pipe;

[0011] A static mixer is connected to the filling pipe, and a second three-way solenoid valve is provided at the outlet end of the static mixer.

[0012] Preferred, including:

[0013] The piston has three grooves on its side wall, and a perfluoroether rubber ring is placed in each groove.

[0014] Preferably, the piston has a perfluoroether rubber gasket at its front end.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention uses a hydraulic push rod to pull a piston to create negative pressure inside a cylinder. Multiple air inlet pipes connect to different gas containers. A gas flow sensor and a first three-way solenoid valve control the gas mixing ratio. The cylinder attracts gas by relying on negative pressure. The controller sets the target mixing amount and ratio. The cylinder and piston form a mixing chamber from zero volume, solving the problem of gas residue in the mixing chamber in the prior art. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of a gas mixing device;

[0018] Fig. 2 This is a perspective structural diagram of a gas mixing device;

[0019] In the diagram: Cylinder 1, Piston 2, Cylinder head 3, Piston rod 4, Hydraulic push rod 5, Support frame 6, Intake pipe 7, First three-way solenoid valve 8, Exhaust pipe 9, First solenoid valve 10, Filling pipe 11, Second solenoid valve 12, Static mixer 13, Second three-way solenoid valve 14, Perfluoroether rubber ring 15, Perfluoroether rubber pad 16, Gas flow sensor 17. Detailed Implementation

[0020] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below to facilitate understanding by those skilled in the art.

[0021] Please see Figs. 1-2 This embodiment provides a gas mixing device, including:

[0022] Cylinder 1, with piston 2 inside and cylinder head 3 at the rear;

[0023] A hydraulic push rod 5 is mounted on the cylinder head 3 to drive the piston 2 to move; the piston rod 4 of the hydraulic push rod 5 passes through the cylinder head 3 and is connected to the piston 2; the cylinder head 3 is provided with a vent hole; the cylinder 1 and the hydraulic push rod 5 are respectively fixed by a support frame 6.

[0024] An intake pipe 7 is provided, and several intake pipes 7 are disposed on the front bottom surface of the cylinder 1. Each intake pipe 7 is equipped with a first three-way solenoid valve 8 and a gas flow sensor 17; in this embodiment, five intake pipes 7 are provided. The function of the first three-way solenoid valve 8 is to release impurities in the pipeline through a first bypass before mixing.

[0025] An exhaust pipe 9 is provided on the bottom surface of the front end of the cylinder 1. A first solenoid valve 10 is provided on the exhaust pipe 9. The exhaust pipe 9 is used to discharge impurity gases in the cylinder 1.

[0026] A filling pipe 11 is provided on the bottom surface of the front end of the cylinder 1, and a second solenoid valve 12 is provided on the exhaust pipe 9;

[0027] A static mixer 13 is connected to the filling pipe 11. The outlet end of the static mixer 13 is provided with a second three-way solenoid valve 14. The second bypass of the second three-way solenoid valve 14 is used to discharge impurity gases in the static mixer 13 and the filling pipe 11 to ensure the purity of the mixed gas storage container.

[0028] Preferred, including:

[0029] The piston 2 has three grooves on its side wall, and a perfluoroether rubber ring 15 is provided in the groove. The perfluoroether rubber ring 15 is interference-fitted with the inner wall of the cylinder 1.

[0030] The piston 2 is provided with a perfluoroether rubber pad 16 at its front end, which is used to squeeze out the impurity gas in the cylinder 1 from the cylinder 1.

[0031] The gas mixing device also includes a PLC controller, which is electrically connected to the hydraulic push rod 5, the first three-way solenoid valve 8, the gas flow sensor 17, the first solenoid valve 10, the second solenoid valve 12, and the second three-way solenoid valve 14, respectively.

[0032] The controller is configured to perform the following operations:

[0033] Initial exhaust phase:

[0034] Open the first solenoid valve 10, control the hydraulic push rod 5 to drive the piston 2 forward to the limit position of the front end of the cylinder 1, and close the first solenoid valve 10.

[0035] Connect the storage containers of the gases to be mixed to the inlet pipe 7 respectively, open the first bypass of the first three-way solenoid valve 8 for 3 seconds and rely on the gas pressure of the storage containers to discharge the gas in the pipe.

[0036] Gas mixing stage:

[0037] Use the control panel of the PLC controller to set the mixing amount of each gas, and switch each first three-way solenoid valve 8 to the cylinder 1 passage.

[0038] Based on the feedback from the gas flow sensor 17, the retraction speed of the hydraulic push rod 5 is adjusted so that each gas is drawn into the cylinder 1 at the target flow rate. After the gas in a single path reaches the target, the controller immediately closes the corresponding first three-way solenoid valve 8.

[0039] After piston 2 retracts to the set volume, hydraulic push rod 5 reciprocates 3 to 5 times, pushing piston 2 to oscillate in a small stroke to enhance mixing;

[0040] Filling and output stage:

[0041] Close the first three-way solenoid valve 8 of all intake pipes 7;

[0042] Open the second solenoid valve 12 to control the hydraulic push rod 5 to move forward at a constant speed;

[0043] Open the second bypass of the second three-way solenoid valve 14 for 3 seconds to discharge the residual gas in the static mixer 13 and filling pipe 11, and switch the second three-way solenoid valve 14 to the target container pipeline.

[0044] After filling is completed, the bypass passages of the first three-way solenoid valve 8, the first solenoid valve 10, and the second three-way solenoid valve 14 are opened to purge the pipeline.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A gas mixing device, characterized in that, include: The cylinder (1) has a piston (2) inside and a cylinder head (3) at the rear. A hydraulic push rod (5) is provided on the cylinder head (3) for driving the piston (2) to move; An intake pipe (7) is provided on the front bottom surface of the cylinder (1). The intake pipe (7) is provided with a first three-way solenoid valve (8) and a gas flow sensor (17). An exhaust pipe (9) is provided on the bottom surface of the front end of the cylinder (1), and a first solenoid valve (10) is provided on the exhaust pipe (9). A filling pipe (11) is provided on the bottom surface of the front end of the cylinder (1), and a second solenoid valve (12) is provided on the exhaust pipe (9). A static mixer (13) is connected to the filling pipe (11), and a second three-way solenoid valve (14) is provided at the outlet end of the static mixer (13).

2. The gas mixing device according to claim 1, characterized in that, include: The piston (2) has three grooves on its side wall, and a perfluoroether rubber ring (15) is provided in the groove.

3. A gas mixing device according to claim 2, characterized in that, include: The piston (2) is provided with a perfluoroether rubber pad (16) at the front end.

Images