Manufacturing process of small-volume and large-air-flow gas cylinder

Abstract

The invention provides a manufacturing process of a small-volume and large-air-flow gas cylinder, and belongs to the technical field of wine equipment. The plastic gas cylinder solves the problem that an existing plastic gas cylinder with the small volume is small in gas storage capacity. The manufacturing process of the small-volume and large-air-flow gas cylinder is characterized by comprising the following steps: a, manufacturing a cylinder body: manufacturing the plastic cylinder body through an injection molding or blow molding process; b, medium filling, wherein the bottle body is filled with a gas storage medium; and c, inflating gas: inflating the bottle body with high pressure by an inflator at intervals for multiple times, and standing for 30-90 minutes after each time of inflation. According to the manufacturing process of the small-volume and large-air-capacity gas cylinder, the plastic gas cylinder with the small volume can be filled with large air storage capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of beverage equipment and relates to a manufacturing process for small-volume and large-capacity gas cylinders. Background Art

[0002] A beverage barrel is a tool for containing beverages such as beer. Generally, a spear is provided at the mouth of the beverage barrel, and the spear cooperates with a dispenser. By filling the beverage barrel with high-pressure gas, the beverage in the beverage barrel is pressed out. With the development of beverage drinking equipment technology, for the convenience of use and without connecting to an external gas source, people have invented a wine dispensing device with a high-pressure gas cylinder embedded in the beverage barrel. It relies on the high-pressure gas cylinder to release gas into the beverage barrel, so that the beverage in the beverage barrel flows out through the liquid outlet pipe, the spear, and the dispenser under the action of gas pressure for people to drink.

[0003] For example, the wine barrel disclosed in the patent document (application number: 202322349546.5) includes a barrel body. A gas cylinder is provided in the barrel body. The gas cylinder has an inner liner for storing gas. Gas adsorption materials such as activated carbon or zeolite are provided in the inner liner. The gas adsorption materials can adsorb the excessive carbon dioxide gas generated in the inner liner and limit the pressure rise in the inner liner. When wine needs to be taken, the balance valve on the gas cylinder is opened, so that the high-pressure gas in the gas cylinder enters the barrel body, thereby pressing out the wine in the barrel body.

[0004] To ensure strength, the inner liners of the above-mentioned gas cylinders are all made of metal materials. Before being placed in the wine barrel, high-pressure gas needs to be filled into the gas cylinder first, so that the high-pressure gas is absorbed by the gas adsorption materials, and then the gas cylinder stores a predetermined amount of gas. Currently, the inflation process of gas cylinders usually uses an inflator to fill the gas cylinder with a sufficient amount of high-pressure gas at one time, and then let it stand for several hours, so that the high-pressure gas is gradually absorbed by the internal gas adsorption materials. However, since the gas filled during inflation acts downward on the gas adsorption materials, the gas adsorption materials are pressed down, making it difficult for the high-pressure gas above to come into full contact with the gas adsorption materials below. Even after standing for several hours, the gas that is difficult to be absorbed above causes the air pressure in the upper part of the gas cylinder to be too high and does not meet the safety requirements, and the gas adsorption materials below are difficult to fully absorb the gas, resulting in a decrease in the gas storage capacity of the gas cylinder. To address this problem, the commonly used method at present is to shake the gas cylinder during the standing process to make the gas contact the gas adsorption materials as much as possible, or directly use gas adsorption materials with higher structural strength to avoid being pressed by high-pressure gas. Summary of the Invention

[0005] The object of the present invention is to address the above problems existing in the prior art and propose a manufacturing process for small-volume and large-capacity gas cylinders. This manufacturing process for small-volume and large-capacity gas cylinders can fill a relatively small plastic gas cylinder with a relatively large gas storage capacity.

[0006] The object of the present invention can be achieved by the following technical solutions: A manufacturing process for a small-volume and large-capacity gas cylinder, characterized by comprising the following steps:

[0007] a. Manufacturing the cylinder body: Manufacturing a cylinder body made of plastic material by injection molding or blow molding process;

[0008] b. Filling the medium: Filling a gas storage medium into the cylinder body;

[0009] c. Charging the gas: The gas charger charges the cylinder body with high pressure in multiple intervals, and stands still for 30 - 90 minutes after each charging.

[0010] The cylinder body made of plastic material is integrally formed by injection molding or blow molding process, and is generally cylindrical. Its height is 2 - 4 times its diameter, so the cylinder body is slender. The gas storage medium is usually granular. After filling, it accumulates in the cylinder body and occupies most of the inner cavity of the cylinder body from bottom to top, leaving a certain space above the gas storage medium. Different from the existing situation where the gas is charged all at once during inflation, the upper gas storage medium can fully absorb the gas. However, because the high-pressure gas acts downward on the gas storage medium, the granular gas storage medium is compacted. At the same time, the cylinder body is slender, making it difficult for the gas above to pass through the particle gaps and contact the lower gas storage medium, resulting in excessive air pressure in the upper cavity of the cylinder body and affecting safety, and insufficient absorption of the lower gas storage medium and affecting the gas storage capacity. In step c of this application, high-pressure multiple-interval charging is adopted to reduce the charging amount each time, avoid excessive compaction of the gas storage medium, enable the gas above to pass through the gaps and contact the lower gas storage medium and be fully absorbed during the standing process. At the same time, a downward air flow will be generated in the cylinder body during each charging process, and this air flow can make the gas pass downward through the gaps of the gas storage medium and contact the lower gas storage medium. Multiple chargings increase the number of times of generating the air flow and the duration of the air flow, so that the lower gas storage medium fully absorbs the gas, making the small-volume gas cylinder also have a large gas storage capacity.

[0011] In the above manufacturing process for a small-volume and large-capacity gas cylinder, in the above step c, the gas charger charges the cylinder body with a high pressure of 7 - 12 bar each time for 3 - 6 times, and each charging lasts for 1 - 4 minutes. The amount of gas charged each time can ensure that there are sufficient gaps between the gas storage media for the gas to pass through, and at the same time, a continuous downward air flow is generated within 1 - 4 minutes, so that the lower gas storage medium fully absorbs the gas and improves the gas storage capacity.

[0012] In the manufacturing process of the above-mentioned small-volume and large-capacity gas cylinders, in step b above, the gas storage medium is activated carbon, and the ratio of the amount of the gas storage medium filled into the cylinder body to the volume of the cylinder body is 0.5 to 0.9, so that one-fifth of the space is reserved above the gas storage medium in the cylinder body. If the amount of the gas storage medium is too small, the gas storage capacity of the gas cylinder will be affected. If the amount of the gas storage medium is too large, the space above the gas storage medium in the cylinder body will be too small, resulting in too high air pressure in the cylinder body after a single inflation. Therefore, the ratio of the amount of the gas storage medium to the volume of the cylinder body is reasonably controlled to ensure that there is enough space above the gas storage medium in the cylinder body for gas filling, and the gas is fully absorbed by the gas storage medium below during the static process, and the gas storage capacity of the gas cylinder is guaranteed.

[0013] In the manufacturing process of the above-mentioned small-volume and large-capacity gas cylinders, in step a above, the cylinder body made by injection molding or blow molding process includes a cylinder body and a straight cylindrical bottleneck, and a circumferentially arranged annular slot is machined on the outer peripheral surface of the bottleneck. When using the injection molding process, the slot can be injection molded at one time. When using the blow molding process, the slot can be machined. After filling the gas storage medium, a gas valve needs to be installed at the bottle mouth of the bottleneck, and the slot is used to form a snap connection with the gas valve.

[0014] In the manufacturing process of the above-mentioned small-volume and large-capacity gas cylinders, the gas cylinder further includes a gas valve. The gas valve includes a straight cylindrical valve cover, and the upper edge of the valve cover is turned outwards. Between step b and step c above, the following steps are further included:

[0015] b1. Install the gas valve: Insert the valve cover into the bottleneck, and use a riveting device to radially inwardly fasten the turned-out edge of the valve cover in the slot, and radially outwardly expand the part of the valve cover located in the bottleneck and abut and support it on the inner side surface of the bottleneck. The valve cover is riveted at the bottle mouth, which can play a role in closing the cylinder body. The edge of the valve cover is buckled in the slot of the bottleneck, which not only plays a connecting role, but also can radially restrict the bottleneck to prevent radial expansion deformation under the action of internal high-pressure gas. The valve cover is radially outwardly expanded and abuts and supports on the inner side surface of the bottleneck, thereby preventing the plastic bottleneck from deforming under the fastening action of the valve cover edge, and further ensuring the structural stability of the plastic cylinder body.

[0016] In the manufacturing process of the above-mentioned small-volume and large-capacity gas cylinders, the specific process of step a above is as follows:

[0017] a1: Inject PET raw materials into a preform mold by an injection molding machine to form a preform;

[0018] a2: Machine the mouth part of the preform through a numerical control machine tool to form the above-mentioned slot;

[0019] a3: Put the preform into an oven for heating, and then put it into the blow mold of a blow molding machine for low-pressure pre-blowing and high-pressure blow molding.

[0020] First, the PET raw material is made into a slender preform, and then a groove is processed on the outer surface of the mouth. During the blow molding process, low-pressure pre-blowing can make the preform extend within a controllable range, and high-pressure blow molding allows the preform to fully contact the blowing mold to form a bottle body.

[0021] In the manufacturing process of the small-volume and large-volume gas cylinder, in the above step a3, the pull rod of the bottle blowing machine slowly extends and presses against the bottom of the bottle embryo during low-pressure pre-blowing, and the bottle body is obtained by cooling after high-pressure blow molding. The pull rod allows the bottle embryo to be extended as required, thereby ensuring uniform wall thickness of the bottle body and structural strength of the bottle body.

[0022] A manufacturing process of a small-volume large-capacity gas cylinder, characterized in that it comprises the following steps:

[0023] a. Bottle body making: the bottle body made of plastic is made by injection molding or blow molding;

[0024] b. Filling medium: Fill the bottle with gas storage medium;

[0025] c. Inflatable gas: The inflator continuously inflates the bottle with low pressure, or the inflator continuously inflates the bottle with high and low pressure alternately, and a gas cylinder is formed after the inflation is completed.

[0026] In step c of the manufacturing process, low pressure is used to continuously inflate the bottle. The low pressure can prevent the gas storage medium in the bottle from being compacted, so as to retain a gap for the gas to pass through. The continuous inflation causes a continuous downward airflow in the bottle. The airflow helps the gas to pass through the gap of the gas storage medium and fully contact with the gas storage medium at the bottom, thereby increasing the gas storage capacity. Similarly, the method of alternating high and low pressure inflation can not only generate a continuous downward airflow, but also the size of the airflow can be intermittently changed, which is conducive to the gas storage medium absorbing the gas, thereby increasing the gas storage capacity.

[0027] In the above-mentioned manufacturing process of the small-capacity large-volume gas cylinder, in the above-mentioned step c, the inflator continuously inflates the bottle body with a low pressure of 1 to 5 bar for 150 to 300 minutes.

[0028] In the above-mentioned manufacturing process of the small-capacity large-volume gas cylinder, in the above-mentioned step c, the inflator continuously inflates the bottle body with a high pressure of 9 to 12 bar and a low pressure of 1 to 3 bar alternately, and the inflation time is 120 to 240 minutes.

[0029] Compared with the prior art, the manufacturing process of the small-volume large-capacity gas cylinder has the following advantages:

[0030] 1. Since step c of the present application adopts high-pressure multiple interval inflation, the amount of inflation each time is reduced, avoiding excessive compaction of the gas storage medium. The gas above can pass through and contact with the gas storage medium below and be fully absorbed during the static process, thereby increasing the gas storage capacity of the gas cylinder.

[0031] 2. Since each inflation process generates a downward air flow inside the bottle body, this air flow can enable the gas to pass downward through the gaps of the gas storage medium and contact the lower gas storage medium. Multiple inflations increase the number of times the air flow is generated and the duration of the air flow, thereby enabling the lower gas storage medium to fully absorb the gas, so that a small-volume gas cylinder also has a large gas storage capacity.

[0032] 3. By reasonably controlling the ratio of the amount of the gas storage medium to the volume of the bottle body, enough space is reserved above the gas storage medium inside the bottle body for the gas to be filled, and it is fully absorbed by the lower gas storage medium during the static process, and the gas storage capacity of the gas cylinder is ensured.

[0033] 4. Since the turned-out edge of the valve cap is radially inwardly fastened in the clamping groove by a riveting device, radial restraint is exerted on the bottleneck to prevent radial expansion deformation under the action of the internal high-pressure gas. The part of the valve cap located inside the bottleneck is radially outwardly pushed open and abuts against the inner side surface of the bottleneck, thereby preventing the plastic bottleneck from deforming under the fastening action of the valve cap edge, and further ensuring the structural stability of the plastic bottle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a structural sectional view of the gas cylinder.

[0035] Figure 2 is a flow chart of the manufacturing process.

[0036] In the figure, 1. Bottle body; 11. Bottle body; 12. Bottleneck; 121. Clamping groove; 122. Flange; 2. Gas valve; 21. Valve cap; 3. Gas storage medium; 4. Sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following are specific embodiments of the present invention in combination with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0038] Embodiment 1:

[0039] A manufacturing process for a small-volume large-capacity gas cylinder, as Figure 1 shown, the gas cylinder includes a bottle body 1 and a gas valve 2. The bottle body 1 includes a bottle body 11 and a straight cylindrical bottleneck 12. The bottle body 1 is in the shape of a slender cylinder, and its height is about 3 times its diameter. The diameter of the bottleneck 12 is smaller than the diameter of the bottle body 11, that is, the diameter of the bottleneck 12 is about half of the diameter of the bottle body 11. The gas valve 2 includes a straight cylindrical valve cap 21. The lower part of the valve cap 21 is closed, and components such as a valve body and a valve core are installed at the middle position. The upper edge of the valve cap 21 is turned outwards. Combining Figure 2 shown, the manufacturing process includes the following steps:

[0040] a. Bottle body: The bottle body 1 made of plastic material is made by blow molding. Specifically, the PET raw material is first injected into the preform mold by an injection molding machine to form a preform. The preform is in the shape of a slender straight cylinder, and there is a circular flange 122 on the outer side of the bottle mouth of the preform. Then, the outer side of the mouth of the preform is machined by a CNC machine tool to form a circular groove 121, which is located above the flange 122; finally, the preform is placed in an oven for heating. After the preform is heated to a predetermined temperature, it is placed in the blow mold of the blow molding machine so that the mold mouth of the blow molding machine clamps the flange 122 of the preform, and low-pressure pre-blowing is performed. The blow molding pressure value is 8 bar. During low-pressure pre-blowing, the pull rod of the blow molding machine slowly extends and supports the bottom of the preform to make it extend in a predetermined direction and speed, and then high-pressure blow molding is performed and cooled to obtain the bottle body 1. Of course, in the actual processing process, one-time injection molding by an injection molding machine can also be used.

[0041] b. Filling medium: Fill the bottle body 1 with a gas storage medium 3. In this embodiment, the gas storage medium 3 is preferably granular activated carbon, and the ratio of the amount of the gas storage medium 3 filled in the bottle body 1 to the volume of the bottle body 1 is 0.8. For example, if the volume of the bottle body 1 in this embodiment is 285 ml, the amount of the gas storage medium 3 filled is 80 grams, thereby reserving 57 ml of space above the gas storage medium 3 in the bottle body 1.

[0042] b1. Installing the gas valve: Install the sealing ring 4 in the valve cover 21, insert the valve cover 21 into the bottleneck 12, make the sealing ring 4 abut against the upper end surface of the bottleneck 12, and buckle the outwardly folded part of the valve cover 21 on the upper part of the bottleneck 12 and press on the sealing ring 4. Fasten the outwardly folded edge of the valve cover 21 radially inward into the groove 121 through the riveting equipment, and spread the part of the valve cover 21 located in the bottleneck 12 radially outward and abut against the inner side of the bottleneck 12.

[0043] c. Inflating gas: The inflator uses high pressure to inflate the bottle body 1 at intervals for multiple times. Specifically, the inflator fills the bottle body 1 with 10 bar of gas twice in a row. Each inflation process lasts for 2 seconds and then stands for 60 minutes. Because it is continuously filled, it can also be understood as inflation once and lasts for 4 minutes; the second time, 10 bar of gas is filled into the bottle body 1, and the inflation process lasts for 2 seconds, and then stands for 60 minutes. The third time, 11 bar of gas is filled into the bottle body 1, and the inflation process lasts for 2 seconds, and then stands for 60 minutes; the fourth time, 9 bar of gas is filled into the bottle body 1, and the inflation process lasts for 2 seconds, first stands for 60 minutes, and then stores for 11 hours, to obtain a small-volume, large-capacity gas cylinder, and the pressure value in the gas cylinder is maintained at 9.5-11.5 bar. The specific inflation process is shown in the following table:

[0044] Inflation times Inflation volume bar Single inflation time S Rest time 1 9.5～10.5 4 60 min 2 9.5～10.5 2 60 min 3 10.5～11.5 2 60 min 4 8.5～9.5 2 12h

[0045] Embodiment 2:

[0046] The manufacturing process of this small-volume and large-capacity gas cylinder is basically the same as that of the first embodiment, except for step c, filling gas:

[0047] The inflator continuously fills the gas cylinder 1 with low pressure. Specifically, the inflator continuously fills the gas cylinder 1 with a low pressure of 3 bar. The filling duration is 240 min, and after filling, it is left standing for 12 h.

[0048] Embodiment 3:

[0049] The manufacturing process of this small-volume and large-capacity gas cylinder is basically the same as that of the first embodiment, except for step c, filling gas:

[0050] The inflator alternately fills the gas cylinder 1 with high pressure and low pressure continuously. Specifically, the inflator alternately fills the gas cylinder 1 with a high pressure of 10 bar and a low pressure of 2 bar continuously. The filling duration is 150 min, and after filling, it is left standing for 12 h.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0052] Although terms such as gas cylinder 1, cylinder body 11, and bottleneck 12 are used more frequently in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A manufacturing process for a small-volume and large-air-capacity gas cylinder, characterized in that, The following steps are involved: a. Bottle body manufacturing: a plastic bottle body is manufactured by injection molding or blow molding (1); b. Filling the medium: filling the bottle body (1) with a gas storage medium (3); c. Inflating gas: The inflator uses high pressure to inflate the bottle (1) at intervals for multiple times, and each time the inflator is left to stand for 30 to 90 minutes.

2. The manufacturing process of the small-volume and large-air-capacity gas cylinder according to claim 1, characterized in that, In the above step c, the inflator inflates the bottle (1) 3 to 6 times at a high pressure of 7 to 12 bar each time, and each inflation lasts for 1 to 4 minutes.

3. The manufacturing process of the small-volume and large-air-volume gas cylinder according to claim 1 or 2, characterized in that, In the above step b, the gas storage medium (3) is activated carbon, and the ratio of the amount of the gas storage medium (3) filled into the bottle body (1) to the volume of the bottle body (1) is 0.5 to 0.

9.

4. The manufacturing process of the small-volume and large-air-volume gas cylinder according to claim 1 or 2, characterized in that, In the above step a, the bottle body (1) manufactured by injection molding or blow molding comprises a bottle body (11) and a straight cylindrical bottleneck (12), and an annular groove (121) arranged along the circumferential direction is processed on the outer peripheral surface of the bottleneck (12).

5. The manufacturing process of the small-volume and large-air-volume gas cylinder according to claim 4, characterized in that, The gas cylinder further comprises a gas valve (2), the gas valve (2) comprises a straight-cylindrical valve cover (21), the upper edge of the valve cover (21) is folded outwards, and between the above steps b and c, the following steps are further included: b1. Installing the gas valve: insert the valve cover (21) into the bottleneck (12), and fasten the outward-turned edge of the valve cover (21) radially inwardly into the groove (121) by riveting equipment, and expand the portion of the valve cover (21) located inside the bottleneck (12) radially outwardly and support it against the inner side of the bottleneck (12).

6. The manufacturing process of the small-volume and large-air-volume gas cylinder according to claim 4, characterized in that, The specific process of step a above is as follows: a1: The PET raw material is injected into the preform mold through the injection molding machine to form a preform; a2: machining the mouth of the bottle blank by a CNC machine tool to form the above-mentioned groove (121); a3: Put the preform into the oven for heating, and then put it into the bottle blowing mold of the bottle blowing machine for low-pressure pre-blowing and high-pressure blow molding.

7. The manufacturing process of the small-volume and large-air-volume gas cylinder according to claim 6, characterized in that, In the above step a3, during low-pressure pre-blowing, the pull rod of the bottle blowing machine slowly extends out and presses against the bottom of the preform, and after high-pressure blow molding, cooling is performed to obtain a bottle body (1).

8. A manufacturing process for a small-volume and large-air-capacity gas cylinder, characterized in that, The following steps are involved: a. Bottle body manufacturing: a plastic bottle body is manufactured by injection molding or blow molding (1); b. Filling the medium: filling the bottle body (1) with a gas storage medium (3); c. Inflatable gas: the inflator continuously inflates the bottle body (1) with low pressure, or the inflator continuously inflates the bottle body (1) with high pressure and low pressure alternately, and a gas cylinder is formed after the inflation is completed.

9. The manufacturing process of the small-volume and large-air-capacity gas cylinder according to claim 8, characterized in that, In the above step c, the inflator continuously inflates the bottle (1) at a low pressure of 1 to 5 bar for 150 to 300 minutes.

10. The manufacturing process of the small-volume and large-air-capacity gas cylinder according to claim 8, characterized in that, In the above step c, the inflator continuously inflates the bottle body (1) with a high pressure of 9 to 12 bar and a low pressure of 1 to 3 bar alternately, and the inflation time is 120 to 240 minutes.

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