Gas mixing device and gas mixing system

Abstract

The utility model relates to a kind of gas mixing device and gas mixing system, including gas mixing cylinder, gas mixing pipeline, piston pump and drive assembly, the gas mixing cylinder inside is equipped with gas mixing chamber, the axial both ends of gas mixing chamber are equipped with gas connection, gas mixing pipeline includes two first gas pipe and second gas pipe respectively connecting gas connection, first gas pipe and second gas pipe are used to connect battery pack to be measured;Piston pump separates gas mixing chamber into first chamber and second chamber independent of each other, piston pump transmission connection drive assembly, drive assembly is used to drive piston rod reciprocating motion in gas mixing chamber.The utility model changes the volume of first chamber and second chamber constantly in the process of piston pump reciprocating motion, changes the pressure in first chamber and second chamber, the first gas pipe and second gas pipe that turn on continuously carry out air extraction or inflation to the two connection positions of battery pack to be measured, constantly change the air inlet direction of battery pack to be measured, realize the sufficient mixing of helium detection gas.

Description

Technical Field

[0001] This utility model relates to the technical field of battery leak detection equipment, specifically to a gas mixing device and gas mixing system. Background Technology

[0002] A helium suction gun detector is a specialized device that uses helium as a tracer gas, combined with mass spectrometry or thermal conductivity sensor technology, to perform high-precision leak detection in sealed systems. Its core principle is to collect gas near suspected leak points using a suction gun, quickly analyze the helium concentration within the gas, and thus locate and quantify the amount of leakage.

[0003] The core purpose of using a gas mixing device in helium detection is to meet the need for "precise control of helium concentration" in different detection scenarios. Whether it is for equipment calibration, cost reduction, or simulating actual working conditions, the gas mixing device can solve the limitations of using pure helium by accurately adjusting the ratio of helium to carrier gas, thus ensuring the accuracy, economy, and practicality of the detection results.

[0004] However, existing gas mixing devices use a single-port inflation method for gas mixing. During gas mixing, the battery pack needs to be repeatedly evacuated and inflated using a pressure pump. This creates flow blind zones in the irregular cavities inside the battery pack, leading to an unstable mixing ratio of helium and carrier gas. Furthermore, the gas cannot flow sufficiently during the static mixing process, requiring a longer mixing time. This also results in large deviations in the final calibration results, which may lead to missed detection of dangerous leaks or misjudgment of qualified battery packs as leaky ones during subsequent testing. Utility Model Content

[0005] The first aspect of this utility model aims to solve the technical problem of unstable mixing ratio and low efficiency of helium and carrier gas caused by reciprocating gas filling of the gas mixing device. It provides a gas mixing device that can connect to a battery pack by setting two gas mixing pipelines, so that the battery pack can be continuously filled with gas in reciprocating gas filling, and the helium detection gas in the gas mixing device can be uniformly mixed in the pipelines.

[0006] To achieve the above objectives, this utility model provides a gas mixing device, including a gas mixing cylinder, a gas mixing pipeline, a piston pump, and a drive assembly. The gas mixing cylinder has a gas mixing chamber inside, and air inlets are provided at both axial ends of the gas mixing chamber. The gas mixing pipeline includes two air pipes, a first air pipe and a second air pipe, which are respectively connected to the air inlets. The first air pipe and the second air pipe are used to connect to the battery pack under test. The piston pump divides the gas mixing chamber into two independent chambers, a first chamber and a second chamber. The piston pump is driven by the drive assembly, which drives the piston rod to reciprocate within the gas mixing chamber. This solution uses a telescopic rod connected to the drive assembly to cause the piston to reciprocate axially within the mixing chamber. During this reciprocating motion, the volumes of the first and second chambers continuously change, altering the pressure within them. The connected first and second air pipes continuously and alternately pump and fill the two connection points of the battery pack under test. Furthermore, the connectors on the battery pack, which connect to the first and second air pipes respectively, allow the gas to pass through the battery pack under test, continuously changing the air intake direction. This bidirectional convection increases the effective travel of the gas within the mixing pipeline, improves the gas renewal rate per unit time, and achieves thorough mixing and improved efficiency of the helium detection gas.

[0007] Preferably, the first or second gas pipe is equipped with a gas distributor, which is used to converge and divide gas in the gas mixing pipeline. The gas distributor can draw in or fill into the gas mixing pipeline, changing the negative and positive pressure states in the gas mixing pipeline.

[0008] Preferably, the piston pump includes a sliding plug and a telescopic rod connecting the sliding plug. The sliding plug is disposed inside the mixing chamber, and the mixing cylinder and the telescopic rod are slidably sealed. The slidable seal between the mixing cylinder and the telescopic rod ensures that the movement of the telescopic rod does not affect the airtightness of the mixing cylinder. Furthermore, by limiting the length of the telescopic rod, the range of motion of the sliding plug within the mixing chamber is further restricted, thus preventing the sliding plug from clogging the gas inlet.

[0009] Preferably, the drive assembly includes a drive motor, a threaded rod, a guide rod, a nut seat, a positioning plate, and a cylinder seat. The positioning plate and the cylinder seat are arranged opposite to each other, and the cylinder seat is connected to the mixing cylinder. One end of the guide rod is connected to the cylinder seat, and the other end is connected to the positioning plate. One end of the threaded rod is driven by the drive motor, and the other end is connected to the positioning plate through a bearing. The piston rod, guide rod, and threaded rod have parallel axes. The nut seat includes a mounting plate and a lead screw nut and a guide hole disposed on the mounting plate. The lead screw nut is driven by the threaded rod, and the nut seat is slidably connected to the guide rod through the guide hole. The piston rod is connected to the nut seat. When the drive motor drives the threaded rod to rotate, the rotational motion is converted into reciprocating linear motion by the constraint of the guide rod. The nut seat moves linearly along the axis of the threaded rod, and the nut seat drives the piston rod to extend and retract synchronously along the axis of the mixing cylinder, realizing the reciprocating motion of the piston in the mixing chamber of the mixing cylinder.

[0010] Preferably, it also includes a mixing chamber, which is used to horizontally place the mixing cylinder and the drive assembly. With the mixing cylinder and drive assembly horizontally placed inside the mixing chamber, for a piston pump that reciprocates within the mixing cylinder for extended periods, the horizontal placement of the drive assembly makes the load more stable, and the output force of the lead screw assembly can be transmitted to the load more accurately, reducing the risk of output loss due to gravity.

[0011] A gas mixing system includes a gas mixing device, a helium-filling component, and a negative pressure component. The helium-filling component and the negative pressure component are connected to a gas mixing pipeline via a gas distribution block. The helium-filling component is used to fill the gas mixing device with helium, and the negative pressure component is used to extract gas from the gas mixing device. Before filling the gas mixing pipeline with helium, the helium-filling component can first extract a portion of the gas from the gas mixing pipeline through the negative pressure component, creating a negative pressure state in the gas mixing pipeline. Through the cooperation of the negative pressure component and the helium-filling component, the sudden pressure increase caused by directly filling with helium can be avoided, preventing damage to the gas mixing pipeline. Furthermore, when the helium filled by the helium-filling component mixes with the air in the gas mixing pipeline, the initial air concentration in the gas mixing pipeline can be changed simply by adjusting the amount of air extracted through the negative pressure component, achieving flexible adjustment of the helium concentration.

[0012] Preferably, the helium filling assembly includes a helium filling pipeline, a helium cylinder, and a solenoid valve. The solenoid valve controls the opening and closing of the helium filling pipeline, and the helium cylinder is used to supply helium.

[0013] Preferably, the negative pressure assembly includes a negative pressure pipeline, a solenoid valve, a vacuum pump, and a negative pressure tank. The solenoid valve controls the opening and closing of the negative pressure pipeline, the vacuum pump provides negative pressure for evacuation, and a negative pressure tank is placed between the solenoid valve and the vacuum pump to buffer pressure. In actual use, when the solenoid valve is closed, the vacuum pump first evacuates the negative pressure tank to the set negative pressure, and then the solenoid valve is opened to evacuate air into the mixing pipeline through the negative pressure tank. At this time, the pressure in the negative pressure pipeline will slowly and steadily drop to the same pressure as the negative pressure tank, avoiding the impact of sudden pressure changes on the negative pressure pipeline.

[0014] The beneficial effects of this utility model are as follows: the telescopic rod connected by the drive assembly causes the piston to reciprocate axially in the mixing chamber. During the reciprocating motion of the piston, the volume of the first chamber and the second chamber changes continuously, causing the pressure in the first chamber and the second chamber to change. The first air pipe and the second air pipe continuously pump air and fill air at the two connection points of the battery pack under test. In addition, the connectors set on the battery pack that are respectively connected to the first air pipe and the second air pipe pass through the inside of the battery pack under test, continuously changing the air intake direction of the battery pack under test, so as to achieve full mixing of helium detection gas. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the gas mixing cabinet of this utility model.

[0018] The reference numerals in the attached drawings include: 1. Mixing cylinder; 11. First chamber; 12. Second chamber; 2. Piston pump; 21. Sliding plug; 22. Telescopic rod; 3. First air pipe; 4. Second air pipe; 5. Drive assembly; 51. Drive motor; 52. Threaded rod; 53. Guide rod; 54. Nut seat; 55. Positioning plate; 56. Cylinder seat; 6. Mixing cabinet; 7. Battery pack; 8. Helium filling assembly; 9. Negative pressure assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0020] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" are defined based on the contours of the corresponding components. Terms such as "first" and "second" used in this disclosure are for distinguishing one element from another and do not imply sequence or importance.

[0021] like Figures 1-3 As shown, this utility model provides a gas mixing device, including a gas mixing cylinder 1, a gas mixing pipeline, a piston pump 2, and a drive assembly 5. The gas mixing cylinder 1 has a gas mixing chamber inside, and air inlets are provided at both ends of the gas mixing chamber. The gas mixing pipeline includes two air pipes, a first air pipe 3 and a second air pipe 4, which are respectively connected to the air inlets. The first air pipe 3 and the second air pipe 4 are used to connect to the battery pack under test. The piston pump 2 divides the gas mixing chamber into a first chamber 11 and a second chamber 12 that are independent of each other. The telescopic rod 22 is connected to the drive assembly 5, and the drive assembly 5 is used to drive the piston rod to reciprocate within the gas mixing chamber. This solution uses the telescopic rod 22 connected to the drive assembly 5 to cause the piston to reciprocate axially in the mixing chamber. During the reciprocating motion of the piston, the volume of the first chamber 11 and the second chamber 12 changes continuously, causing the pressure in the first chamber 11 and the second chamber 12 to change. The first air pipe 3 and the second air pipe 4 continuously pump or fill air at the two connection points of the battery pack under test. In addition, the connectors set on the battery pack that are connected to the first air pipe 3 and the second air pipe 4 respectively pass through the inside of the battery pack under test, continuously changing the air intake direction of the battery pack under test, so as to achieve full mixing of helium detection gas.

[0022] Preferably, the gas mixing pipeline is connected to a gas source assembly, and a gas distributor is installed on the first gas pipe 3 or the second gas pipe 4 in the gas mixing pipeline. The gas source assembly includes a helium tank and a negative pressure tank, and the gas distributor is connected to the gas source assembly. The gas in the gas mixing pipeline is extracted by the negative pressure tank to form a negative pressure, and the helium tank can fill the gas mixing pipeline with helium detection gas.

[0023] Preferably, the piston pump 2 includes a sliding plug 21 and a telescopic rod 22 connecting the sliding plug 21. The sliding plug 21 is disposed inside the mixing chamber, and the mixing cylinder 1 and the telescopic rod 22 are slidably sealed. The slidable seal between the mixing cylinder 1 and the telescopic rod 22 ensures that the movement of the telescopic rod 22 does not affect the airtightness of the mixing cylinder 1. Furthermore, by limiting the length of the telescopic rod 22, the range of motion of the sliding plug within the mixing chamber is further limited, thus preventing the sliding plug from clogging the air inlet.

[0024] like Figure 2As shown, the drive assembly 5 includes a drive motor 51, a threaded rod 52, a guide rod 53, a nut seat 54, a positioning plate 55, and a cylinder seat 56. The positioning plate 55 and the cylinder seat 56 are arranged opposite to each other. The cylinder seat 56 is connected to the mixing cylinder 1. One end of the guide rod 53 is connected to the cylinder seat 56, and the other end of the guide rod 53 is connected to the positioning plate 55. One end of the threaded rod 52 is driven by the drive motor 51, and the other end of the threaded rod 52 is connected to the positioning plate 55 through a bearing. The piston rod, the guide rod 53, and the threaded rod 52 are parallel to each other. The nut seat 54 includes a mounting plate and a lead screw nut and a guide hole set on the mounting plate. The lead screw nut is driven by the threaded rod 52, and the nut seat 54 is slidably connected to the guide rod 53 through the guide hole. The piston rod is connected to the nut seat 54. When the drive motor 51 drives the threaded rod 52 to rotate, the rotational motion is converted into reciprocating linear motion by the guide rod 53. The nut seat 54 moves linearly along the axial direction of the threaded rod 52. The nut seat 54 drives the piston rod to extend and retract synchronously along the axial direction of the mixing cylinder 1, thereby realizing the reciprocating motion of the piston in the mixing chamber of the mixing cylinder 1.

[0025] like Figure 3 As shown, it also includes a mixing cabinet 6, which is used to horizontally place the mixing cylinder 1 and the drive assembly 5. The mixing cylinder 1 and the drive assembly 5 are horizontally placed in the mixing cabinet 6. For the piston pump 2, which reciprocates in the mixing cylinder 1 for a long time, the horizontal placement of the drive assembly 5 makes the load more stable, and the output force of the lead screw assembly can be transmitted to the load more accurately, and it is not easy to lose output force due to gravity.

[0026] A gas mixing system includes a gas mixing device, and further includes a helium filling component and a negative pressure component. The helium filling component and the negative pressure component are connected to a gas mixing pipeline through a gas distribution block. The helium filling component is used to fill the gas mixing device with helium, and the negative pressure component is used to extract gas from the gas mixing device.

[0027] Before filling the gas mixing pipeline with helium, the helium filling component can first extract a portion of the gas from the gas mixing pipeline through the negative pressure component, so that the gas mixing pipeline is in a negative pressure state.

[0028] By combining the negative pressure component and the helium filling component, the pressure surge caused by directly filling helium can be avoided from impacting the mixing pipeline. Furthermore, when the helium filling component fills the helium and mixes it with the air in the mixing pipeline, the initial air level in the mixing pipeline can be changed simply by adjusting the amount of air removed through the negative pressure component, thus achieving flexible adjustment of the helium concentration.

[0029] The helium filling assembly includes a helium filling pipeline, a helium cylinder, and a solenoid valve. The solenoid valve controls the opening and closing of the helium filling pipeline, and the helium cylinder is used to supply helium.

[0030] The negative pressure assembly includes a negative pressure pipeline, a solenoid valve, a vacuum pump, and a negative pressure tank. The solenoid valve controls the opening and closing of the negative pressure pipeline, the vacuum pump provides negative pressure for evacuation, and the negative pressure tank is placed between the solenoid valve and the vacuum pump to buffer the pressure. In actual use, when the solenoid valve is closed, the vacuum pump first evacuates the negative pressure tank to the set negative pressure, and then the solenoid valve is opened to evacuate air through the negative pressure tank into the mixing pipeline. At this time, the pressure in the negative pressure pipeline will slowly and steadily drop to the same pressure as the negative pressure tank, avoiding the impact of sudden pressure changes on the negative pressure pipeline.

[0031] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A gas mixing device, characterized by: The system includes a mixing cylinder (1), a mixing pipeline, a piston pump (2), and a drive assembly (5). The mixing cylinder (1) has a mixing chamber inside, and air inlets are provided at both ends of the mixing chamber. The mixing pipeline includes two air pipes, a first air pipe (3) and a second air pipe (4), which are respectively connected to the air inlets. The first air pipe (3) and the second air pipe (4) are used to connect to the battery pack under test. The piston pump (2) divides the mixing chamber into a first chamber (11) and a second chamber (12) that are independent of each other. The piston pump (2) is connected to the drive assembly (5) for driving the piston rod to reciprocate in the mixing chamber.

2. A gas mixing device according to claim 1, characterized in that: The first gas pipe (3) or the second gas pipe (4) is equipped with a gas splitter block, which is used to merge and split the gas in the gas mixing pipeline.

3. A gas mixing device according to claim 1, wherein: The piston pump (2) includes a sliding plug (21) and a telescopic rod (22) connecting the sliding plug (21). The sliding plug (21) is located inside the mixing chamber, and the mixing cylinder (1) and the telescopic rod (22) slide and seal.

4. A gas mixing device according to claim 1, characterized in that: The drive assembly (5) includes a drive motor (51), a threaded rod (52), a guide rod (53), a nut seat (54), a positioning plate (55), and a cylinder seat (56). The positioning plate (55) and the cylinder seat (56) are arranged opposite to each other. The cylinder seat (56) is connected to the mixing cylinder (1). One end of the guide rod (53) is connected to the cylinder seat (56), and the other end of the guide rod (53) is connected to the positioning plate (55). One end of the threaded rod (52) is connected to the drive motor (51) for transmission, and the other end of the threaded rod (52) is connected to the positioning plate (55) through a bearing. The piston rod, the guide rod (53), and the threaded rod (52) are parallel to each other. The nut seat (54) includes a mounting plate and a lead screw nut and a guide hole set on the mounting plate. The lead screw nut is connected to the threaded rod (52) for transmission, and the nut seat (54) is slidably connected to the guide rod (53) through the guide hole. The piston rod is connected to the nut seat (54).

5. A gas mixing device according to claim 1, wherein: It also includes a mixing cabinet (6), which is used to horizontally place the mixing cylinder (1) and the drive assembly (5).

6. A gas mixing system characterized by: The gas mixing device according to any one of claims 1-5 further includes a helium filling component and a negative pressure component, wherein the helium filling component and the negative pressure component are connected to the gas mixing pipeline through a gas distribution block, the helium filling component is used to fill the gas mixing device with helium, and the negative pressure component is used to extract gas from the gas mixing device.

7. A gas mixing system according to claim 6, wherein: The helium filling assembly includes a helium filling pipeline, a helium cylinder, and a solenoid valve. The solenoid valve controls the opening and closing of the helium filling pipeline, and the helium cylinder is used to supply helium.

8. A gas mixing system according to claim 6, wherein: The negative pressure assembly includes a negative pressure pipeline, a solenoid valve, a vacuum pump, and a negative pressure tank. The solenoid valve is used to control the opening and closing of the negative pressure pipeline, the vacuum pump is used to provide negative pressure for evacuation, and a negative pressure tank is installed between the solenoid valve and the vacuum pump to buffer the pressure.

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