Beverage barrel

Abstract

The utility model provides a beverage barrel, and belongs to the technical field of beverage equipment. The beverage barrel can solve the technical problems that an existing beverage barrel is not smooth in filling and is difficult to be filled with beverage at low cost. The beverage barrel comprises a barrel body, an inner bag and a liquid outlet valve installed at the position of a barrel opening of the barrel body, the inner bag is arranged in the barrel body in a folded state, a bag cavity of the inner bag is communicated with the liquid outlet valve, and the inner bag is formed in the mode that two rectangular plastic film pieces are aligned, and the edges of the two rectangular plastic film pieces are fused by a circle. The edge of the inner bag is provided with an edge combination part which is formed by fusing two plastic film sheets in an overlapping manner, and the inner bag is firstly folded, so that the edge combination part is arranged along the height direction of the inner bag and is positioned in the middle position of the transverse direction of the inner bag; then, all corners of the inner bag are recessed and folded towards the inside of the bag cavity, so that the recessed part forms a corner interlayer part, and the edge joint part passes through the surface of each corner interlayer part. When the beverage barrel is used for filling, the inner bag can be unfolded in order, so that the volume of the barrel body is fully utilized.

Description

Technical Field

[0001] The utility model belongs to the technical field of wine and beverage equipment and relates to a beverage barrel. Background Art

[0002] A beverage barrel is a tool for holding beverages. Generally, a liquid outlet valve is provided at the barrel mouth of the beverage barrel. The liquid outlet valve cooperates with a dispenser. An inner bag for storing beverages is provided in the beverage barrel. The bag mouth of the inner bag is connected to the liquid outlet valve. Gas can be injected into the barrel body or the inner bag through the liquid outlet valve, thereby pressing out the beverage in the inner bag.

[0003] When assembling a beverage barrel, the inner bag needs to be loaded into the barrel body from the barrel mouth. The inner bag is large and the barrel mouth is small. Therefore, manual assembly is usually adopted at present. The inner bag is folded into a long strip and then stuffed into the barrel body. However, after the traditional inner bag is loaded into the barrel body, it is difficult to unfold or partially does not unfold due to irregular folds. In particular, when the beverage is filled too quickly, the wrinkled inner bag will partially crush each other, resulting in unsmooth beverage filling or incomplete expansion of the inner bag and failure to be filled, and the barrel volume cannot be maximized.

[0004] Based on the above problems, some existing beverage barrels have also made corresponding improvements. Conventional technical means of solving the problem will fold the inner bag back and forth in a regular Z-shape, so as to facilitate the smooth unfolding of the inner bag during filling. For example, a wine barrel disclosed in a patent document (application number: 201710026045.X) includes a barrel body made of rigid material, a bag body made of flexible material, and a wine outlet valve. The bag body is installed in the barrel body and is fixedly connected to the wine outlet valve. The bag body is folded into a long strip in a Z-shape, and the lower part of the bag body folded into a long strip is bent to one side and rests on the inner bottom surface of the barrel body. This Z-shaped folding method can make beverage filling smooth to a certain extent, but due to the large number of folding times, the inner bag can only be unfolded slowly, so it is more suitable for occasions where the filling speed requirements are not high.

[0005] In addition, the existing conventional technology also provides a separation bag with a plurality of protrusions on the surface between the inner bag and the outer shell, as in a liquid container in a patent document (application number: 201710735013.7), so that in the process of filling the inner bag with liquid, the separation bag with a plurality of protrusions contacts the inner wall of the outer shell, and an airway for the gas in the outer shell to be discharged can be formed between two adjacent protrusions on the separation bag, so that the part of the inner bag close to the inner wall of the outer shell after folding is not easily compacted, thereby ensuring that the inner bag is easy to unfold and increasing the filling volume of the liquid container during filling. Summary of the invention

[0006] The purpose of the utility model is to solve the above problems in the existing technology and to propose a beverage barrel. The utility model can solve the technical problems of the existing beverage barrels being difficult to fill with beverages and being difficult to fill with beverages at a relatively low cost.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a beverage barrel, comprising a barrel body, an inner bag and a liquid outlet valve installed at the barrel mouth of the barrel body, the inner bag is arranged in the barrel body in a folded state and the bag cavity of the inner bag is connected with the liquid outlet valve, characterized in that the inner bag is formed by two rectangular plastic film sheets that are aligned and fused around the edges, and the edge of the inner bag has an edge joint formed by the two plastic film sheets being fused in a superimposed manner, the inner bag is first folded so that the edge joint is arranged along the height direction of the inner bag and is located in the middle position of the inner bag in the transverse direction, and then the corners of the inner bag are concave and folded into the inside of the bag cavity so that the concave parts form corner sandwich parts, and the edge joint passes through the surfaces of the corner sandwich parts.

[0008] The inner bag of the beverage barrel is formed by fusing two rectangular plastic film sheets at the edges, so that the inner bag is easy to manufacture and has low cost. When manufacturing the beverage barrel, the corners of the inner bag are folded into the bag cavity, so that the volume of the folded inner bag can be significantly reduced, which not only makes it easier to put the inner bag into the barrel body from the barrel mouth, but also prevents the inner bag from being pressed against the inner wall of the barrel body and difficult to unfold, so that the inner bag can be smoothly unfolded during canning.

[0009] However, since the corner sandwich is formed by the concave folding of the corner of the inner bag, it is also critical to ensure that the corner sandwich can be smoothly unfolded during the filling process. At this time, the edge joint plays an important role. Specifically, after the inner bag is manufactured, since the edge joint is formed by two plastic film sheets being fused in a superimposed manner, the thickness of the edge joint is the sum of the thicknesses of the two plastic film sheets, so that the edge joint has a certain stiffness and protrudes from the surface of the inner bag. At this time, since the edge joint passes through the surface of each corner sandwich after the inner bag is folded, and since the edge joint has a certain stiffness, it can play the role of internal support, so that the plastic film sheets at the corner sandwich will not be too tightly attached to each other and pressed too tightly, thereby ensuring that the corner sandwich can be smoothly released naturally during filling, so that the inner bag can be unfolded in an orderly manner to fully utilize the barrel volume.

[0010] Furthermore, during the filling process of the beverage barrel, as the beverage gradually enters the inner bag, the inner bag will gradually expand, and the area where the edge joint is located will gradually approach the inner wall of the barrel body, so that the inner bag slowly swells from a flat shape to a columnar shape, and then the edge joint of the inner bag can contact the inner wall of the barrel body. At this time, the edge joint can act as a separator bag, and because the edge joint is located in the middle of the inner bag and is arranged along the height direction of the inner bag, the gas on both sides of the edge joint can be smoothly discharged out of the barrel body along the edge joint, making the gas discharge in the barrel body smoother and more efficient, effectively ensuring that there will be no high-pressure gas between the barrel body and the inner bag to hinder the smooth expansion of the inner bag, thereby making the filling of the beverage barrel smoother. Therefore, the inner bag cleverly uses the edge joint to form a channel for gas escape on the surface of the inner bag, so there is no need to set an additional separator bag in the barrel body as in conventional technical means. On the basis of ensuring smooth filling, the beverage barrel also has the advantages of easy manufacturing and low manufacturing cost.

[0011] In the above-mentioned beverage barrel, after the corners of the inner bag are recessed and folded into the bag cavity to form a corner sandwich portion, the inner bag is folded along the fold line in the height direction to form a long strip. After the inner bag is folded into a long strip, it is convenient to put the inner bag into the barrel body from the barrel mouth, making the beverage barrel easy to manufacture. After the corners of the inner bag are folded into the corner sandwich portion, since the folding is formed into a long strip along the fold line in the height direction of the inner bag, the folded shape is relatively regular, and then when the beverage is pressed into the inner bag, it is conducive to the gradual unfolding of the inner bag, ensuring smooth filling. Because plastic is not like paper, plastic may not have obvious fold lines during the folding process, so the fold line referred to here mainly indicates the direction of folding.

[0012] In the beverage barrel, when the plastic film sheet is unfolded and flattened, the middle part in the transverse direction has a vertical area arranged parallel to its height direction. The vertical areas of the two plastic film sheets are both concave and folded into the bag cavity, and the concave parts form side interlayer parts.

[0013] After canning begins, as the beverage is poured into the bag cavity of the inner bag, the long inner bag will unfold first, and the unfolding area of ​​the inner bag will gradually expand, and then the side interlayer can be smoothly unfolded, so that the inner bag can be fully unfolded for easy filling with beverage.

[0014] Before the inner bag is folded along its height direction fold line to form a long strip, the vertical area of ​​the plastic film sheet is concavely folded to form a side interlayer portion, which can reduce the lateral width of the inner bag and thereby reduce the degree of curling of the inner bag during the process of folding the inner bag into a long strip, thereby facilitating smoother unfolding of the long strip inner bag.

[0015] In the beverage barrel described above, before the inner bag is folded into a long strip along the fold line in the height direction, the corner sandwich portion is located in the middle of the inner bag in the transverse direction and the vertical areas are located on both sides of the corner sandwich portion.

[0016] During the filling process, as the beverage continues to enter the inner bag, the long inner bag will gradually unfold. After unfolding to a certain extent, it will become the state before it is folded into a long strip along the fold line in its height direction. At this time, since the corner interlayer part is located in the middle position of the inner bag, the corner interlayer part can basically be in a flat state instead of being folded in half, which can facilitate the smooth unfolding of the corner interlayer part, thereby making the overall unfolding of the inner bag smoother, ensuring that the beverage can be filled smoothly.

[0017] In the beverage barrel described above, the corner sandwich portion of the inner bag is triangular before it is folded into a long strip along the fold line in the height direction, and the edge joint passes through the midline of the triangular corner sandwich portion. Because plastic is not like paper, it is impossible for plastic to be completely flat during the folding process, so the triangle referred to here is roughly triangular in outline. The edge joint passes through the midline of the triangular corner sandwich portion, so a symmetrical structure is formed on both sides of the midline, so that in the process of filling the inner bag with beverage, both sides of the midline of the corner sandwich portion can be evenly expanded, so that the inner bag can be expanded more smoothly, thereby ensuring that the beverage can be filled smoothly.

[0018] In the beverage barrel, the two plastic film sheets of the inner bag are equal in size and are rectangular when unfolded and laid flat, and the width of the edge joint is 6mm-12mm. Preferably, the width of the edge joint is 10mm. The inner bag is rectangular, which is relatively simple to manufacture, and the four corners are symmetrically arranged and the number of corners is moderate, so it is easy to fold the inner bag mechanically or manually.

[0019] In the beverage barrel described above, the liquid outlet valve is connected to the middle position of the top edge of the inner bag, and the edge joint on the top edge of the inner bag is connected to the liquid outlet valve. Since the edge joint of the inner bag has a relatively good connection strength, the liquid outlet valve is connected to the top edge of the inner bag and the edge joint on the top edge of the inner bag is connected to the liquid outlet valve, which can improve the connection stability between the inner bag and the liquid outlet valve, so that the inner bag is not easily torn at the liquid outlet valve.

[0020] In the beverage barrel described above, the liquid outlet valve is connected with a guide tube extending into the bottom of the inner bag, and the length of the guide tube is less than the height of the plastic film sheet of the inner bag. The guide tube plays a guiding role, and during the drinking process, it can guide the beverage at the bottom of the inner bag to be discharged smoothly, so that the beverage flows out smoothly and avoids the residue of beverage in the inner bag.

[0021] In the beverage barrel, the corner sandwich portion is recessed into the inner bag cavity by a depth of 100mm-200mm, which can ensure that the corner sandwich portion can be smoothly unfolded during the filling process, and at the same time ensure that the inner bag has a smaller volume after folding, so that it is easy to put into the barrel.

[0022] In the beverage barrel, the volume of the inner bag is at least 1.1 times the volume of the barrel body, so that after the inner bag is filled, the inner bag body can be completely attached to the inner wall of the barrel body, and the inner wall of the barrel body supports the inner bag, thereby preventing the inner bag from being damaged due to excessive expansion due to its small volume.

[0023] Compared with the prior art, this beverage barrel has the following advantages:

[0024] 1. The inner bag of the beverage barrel is formed by fusing two rectangular plastic film sheets at the edges, which makes the inner bag easy to manufacture and low in cost. The inner bag has good sealing performance and can extend its service life.

[0025] 2. After the inner bag is folded, the edge joint passes through the surface of each corner sandwich part. At the same time, since the edge joint has a certain stiffness, it can play the role of internal support, so that the plastic film sheets at the corner sandwich part will not stick too tightly to each other and be pressed too tightly, thereby ensuring that the corner sandwich part can be smoothly and naturally released during filling, so that the inner bag can be unfolded in an orderly manner to make full use of the barrel volume.

[0026] 3. Before being folded into a long strip, the inner bag of the beverage barrel is pre-folded to form corner interlayers and side interlayers. This allows the inner bag to be unfolded more smoothly during the beverage filling process compared to the traditional continuous Z-shaped folding method. Therefore, while ensuring that the inner bag can be filled smoothly, the filling speed can also be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of this beverage barrel.

[0028] Figure 2 It is a schematic diagram of the structure of the inner bag after it is folded to form the corner interlayer part and the side interlayer part, and before it is folded into a long strip.

[0029] Figure 3 yes Figure 2 A partial enlarged view of .

[0030] Figure 4 yes Figure 2 Front view of the structure shown.

[0031] Figure 5 It is a schematic diagram of the structure when the inner bag is unfolded and laid flat.

[0032] Figure 6This is a cross-sectional view of the inner bag when it is unfolded and laid flat.

[0033] Figure 7 This is a diagram of the inner bag folding process. Figure 1 .

[0034] Figure 8 This is a diagram of the inner bag folding process. Figure 2 .

[0035] Fig. 9 This is a diagram of the inner bag folding process. Figure 3 .

[0036] In the figure, 1, barrel body; 2, inner bag; 21, bag cavity; 22, plastic film sheet; 221, vertical area; 23, edge joint; 24, corner; 25, corner interlayer; 26, side interlayer; 3, liquid outlet valve; 4, guide tube. DETAILED DESCRIPTION

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

[0038] Embodiment 1

[0039] like Figure 1 As shown, the beverage barrel includes a barrel body 1, an inner bag 2 and a liquid outlet valve 3 installed at the barrel mouth of the barrel body 1. The inner bag 2 is arranged in the barrel body 1 in a folded state and the bag cavity 21 of the inner bag 2 is connected to the liquid outlet valve 3. The volume of the inner bag 2 is at least 1.1 times the volume of the barrel body 1, and specifically can be 1.2 times, 1.3 times, 1.5 times, etc.

[0040] like Figure 2 , Figure 5 and Figure 6 As shown, the inner bag 2 is formed by aligning two rectangular plastic film sheets 22 and fusing them around their edges, and the edge of the inner bag 2 has an edge joint 23 formed by fusing the two plastic film sheets 22 in a superimposed manner. Of course, the plastic film sheet 22 can also be square. The width of the edge joint 23 is 10 mm.

[0041] Combine 2 and Figure 3 As shown, the inner bag 2 has a corner sandwich portion 25, which is formed by first folding the inner bag 2 to make the edge joint portion 23 arranged along the height direction of the inner bag 2 and located in the middle position of the transverse direction of the inner bag 2, and then folding each corner of the inner bag 2 into the bag cavity, and the edge joint portion 23 passes through the surface of each corner sandwich portion 25. After the corners 24 of the inner bag 2 are folded into the bag cavity 21 to form the corner sandwich portion 25, the inner bag 2 is folded along the fold line in the height direction to form a long strip.

[0042] When manufacturing a beverage barrel, the corners 24 of the inner bag 2 are concavely folded toward the inside of the bag cavity 21, so that the volume of the folded inner bag 2 can be significantly reduced, which not only facilitates the inner bag 2 to be placed into the barrel body 1 from the barrel mouth of the barrel body 1, but also prevents the inner bag 2 from being compacted on the inner wall of the barrel body 1 and difficult to unfold, which is conducive to the smooth unfolding of the inner bag 2 during canning. The edge joint 23 has a certain stiffness and protrudes from the surface of the inner bag 2. At this time, since the edge joint 23 passes through the surface of each corner interlayer 25 after the inner bag 2 is folded, and since the edge joint 23 has a certain stiffness, it can play the role of internal support, so that the plastic film sheets 22 at the corner interlayer 25 will not be too tightly attached to each other and pressed too tightly, thereby ensuring that the corner interlayer 25 can be smoothly released naturally during filling, so that the inner bag 2 can be unfolded in an orderly manner to fully utilize the volume of the barrel body 1.

[0043] like Figure 2 , Figure 4 and Figure 5 As shown, when the plastic film sheet 22 is in the unfolded and flattened state, the middle part in the transverse direction has a vertical area 221 arranged parallel to its height direction. Figure 5 In the figure, the area between the two dotted lines is the vertical area 221, and the vertical areas 221 of the two plastic film sheets 22 are both concave and folded toward the inside of the bag cavity 21, and the concave parts form the side sandwich parts 26. Before the inner bag 2 is folded along the fold line in the height direction to form a long strip, the vertical area 221 of the plastic film sheet 22 is concave and folded to form the side sandwich parts 26, which can reduce the lateral width of the inner bag 2, thereby reducing the degree of curling of the inner bag 2 during the process of folding the inner bag 2 into a long strip, thereby facilitating the smoother unfolding of the long strip inner bag 2.

[0044] like Figure 4 As shown, before the inner bag 2 is folded into a long strip along the fold line in the height direction of the inner bag 2, the corner interlayer portion 25 is triangular, and the edge joint portion 23 passes through the midline of the triangular corner interlayer portion 25. The corner interlayer portion 25 is located in the middle position of the inner bag 2 in the transverse direction, and the vertical area 221 is located on both sides of the corner interlayer portion 25. The depth of the corner interlayer portion 25 recessed into the bag cavity 21 of the inner bag 2 is 100mm-200mm, preferably 150mm. During the filling process, as the beverage continues to enter the inner bag 2, the long strip-shaped inner bag 2 will gradually unfold, and after unfolding to a certain extent, it will return to the state before being folded into a long strip along the fold line in the height direction of the inner bag 2. At this time, since the corner interlayer portion 25 is located in the middle position of the inner bag 2, the corner interlayer portion 25 can basically be in a flat state, as shown in FIG. Figure 2 As shown, instead of being folded in half, the corner sandwich portion 25 can be smoothly unfolded, so that the inner bag 2 can be unfolded more smoothly as a whole, ensuring that the beverage can be filled smoothly.

[0045] like Figure 2 and Figure 4 As shown, the liquid outlet valve 3 is connected to the middle position of the top edge of the inner bag 2, and the edge joint 23 on the top edge of the inner bag 2 is connected to the liquid outlet valve 3. The liquid outlet valve 3 is connected to a guide tube 4 extending into the bottom of the inner bag 2, and the length of the guide tube 4 is less than the height dimension of the plastic film sheet 22 of the inner bag 2.

[0046] The following briefly describes how to put the inner bag 2 into the barrel 1:

[0047] Step 1: If Figure 5 As shown, the inner bag 2 is unfolded and laid flat, and at this time, the edge joint 23 of the inner bag 2 is located at the edge of the inner bag 2.

[0048] Step 2: If Figure 7 As shown in the figure, the vertical areas 221 of the two plastic film sheets 22 are pulled outward, so that the edge joints 23 at the two vertical sides of the inner bag 2 are brought close to each other and folded. After folding, the edge joints 23 are arranged along the height direction of the inner bag 2 and located in the middle position of the inner bag 2 in the transverse direction. Then, the two corners 24 at the top of the inner bag 2 are recessed into the bag cavity 21 and folded to form the corner sandwich part 25, forming a Figure 8 The structure shown. Figure 8 In the figure, the two V-shaped dotted lines near the liquid outlet valve 3 indicate the obscured contours of the two corner sandwich portions 25 at the top of the inner bag 2.

[0049] Right now Figure 8 In order to more clearly illustrate the folding method of the inner bag 2, the two corners 24 at the top of the inner bag 2 have been folded to form the corner sandwich portion 25, while the two corners 24 at the bottom of the inner bag 2 have not yet been folded to form the corner sandwich portion 25.

[0050] Step 3: If Fig. 9 As shown, the two corners 24 at the bottom of the inner bag 2 are further folded toward the inside of the bag cavity 21 to form a corner sandwich portion 25.

[0051] Step 4: If Figure 2 As shown, the vertical areas 221 of the two plastic film sheets 22 are both folded and concave toward the inside of the bag cavity 21 , and the concave parts form the side sandwich parts 26 .

[0052] Figure 2 and Fig. 9 In the figure, the two V-shaped dotted lines near the bottom of the inner bag 2 indicate the contour lines of the two corner sandwich parts 25 at the bottom of the inner bag 2 being blocked, and the corresponding two V-shaped dotted lines near the liquid outlet valve 3 indicate the contour lines of the two corner sandwich parts 25 at the top of the inner bag 2 being blocked.

[0053] in addition, Figure 2The two dotted lines respectively close to the two sides of the inner bag 2 and consistent with the height direction of the inner bag 2 indicate the outlines of the two side interlayer parts 26 that are blocked.

[0054] Step 5: If Figure 2 As shown in FIG. 1 , the portions on both sides of the edge joint 23 of the inner bag 2 are folded in the direction of arrow S to form a long strip, and then the inner bag 2 is placed into the barrel body 1 from the barrel mouth of the barrel body 1, and then the liquid outlet valve 3 is fixed, completing the whole process of placing the inner bag 2 into the barrel body 1, and finally forming a strip as shown in FIG. Figure 1 The structure shown.

[0055] The above is an example of the optimal folding method of the inner bag 2. However, in the actual production process, the folding method of the inner bag 2 can be appropriately adjusted. For example, the side sandwich portion 26 can be folded first, and then the corner sandwich portion 25 can be folded. For example, in the fifth step of folding the inner bag 2 into a long strip, the parts on both sides of the edge joint 23 of the inner bag 2 can also be adjusted according to the method described above. Figure 2 The inner bag 2 is not folded in the direction of arrow S, but the parts on both sides of the edge joint 23 of the inner bag 2 are folded in the clockwise and counterclockwise directions respectively.

[0056] The process of folding the inner bag 2 and the process of placing the folded inner bag 2 into the barrel body 1 can be completed manually or by a robot.

[0057] Embodiment 2

[0058] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the width of the edge joint 23 is 6 mm.

[0059] Embodiment 3

[0060] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the width of the edge joint 23 is 12 mm.

[0061] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0062] Although this article uses more terms such as 1. barrel body; 2. inner bag; 21. bag cavity; 22. plastic film sheet; 221. vertical area; 23. edge joint; 24. corner; 25. corner sandwich; 26. side sandwich; 3. liquid outlet valve; 4. guide tube, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A beverage barrel, comprising a barrel body (1), an inner bag (2) and a liquid outlet valve (3) installed at the barrel mouth of the barrel body (1), wherein the inner bag (2) is arranged in the barrel body (1) in a folded state and the bag cavity (21) of the inner bag (2) is connected to the liquid outlet valve (3), characterized in that: The inner bag (2) is formed by aligning two rectangular plastic film sheets (22) and fusing them around their edges, and the edge of the inner bag (2) has an edge joint (23) formed by fusing the two plastic film sheets (22) in a superimposed manner. The inner bag (2) is first folded so that the edge joint (23) is arranged along the height direction of the inner bag (2) and is located in the middle position of the inner bag (2) in the transverse direction, and then each corner (24) of the inner bag (2) is concavely folded into the inside of the bag cavity (21) so that the concave part forms a corner sandwich portion (25), and the edge joint (23) passes through the surface of each corner sandwich portion (25).

2. The beverage barrel according to claim 1, characterized in that: After the corners (24) of the inner bag (2) are folded into the bag cavity (21) to form a corner sandwich portion (25), the inner bag (2) is folded along the fold line in the height direction to form a long strip.

3. The beverage barrel according to claim 2, characterized in that: When the plastic film sheet (22) is in an unfolded and flattened state, the middle part in the transverse direction has a vertical region (221) arranged parallel to its height direction, and the vertical regions (221) of the two plastic film sheets (22) are both concave and folded into the bag cavity (21), and the concave parts form side sandwich parts (26).

4. The beverage barrel according to claim 3, characterized in that: Before the inner bag (2) is folded into a long strip along a fold line in its height direction, the corner sandwich portion (25) is located in the middle of the inner bag (2) in the transverse direction and the vertical regions (221) are located on both sides of the corner sandwich portion (25).

5. The beverage barrel according to claim 3, characterized in that: Before the inner bag (2) is folded into a long strip along the fold line in the height direction, the corner sandwich portion (25) is triangular, and the edge joint portion (23) passes through the midline of the triangular corner sandwich portion (25).

6. The beverage barrel according to any one of claims 1 to 5, characterized in that: The two plastic film sheets (22) of the inner bag (2) are equal in size and rectangular in shape.

7. The beverage barrel according to any one of claims 1 to 5, characterized in that: The liquid outlet valve (3) is connected to the middle position of the top edge of the inner bag (2), and the edge joint (23) on the top edge of the inner bag (2) is connected to the liquid outlet valve (3).

8. The beverage barrel according to any one of claims 1 to 5, characterized in that: The liquid outlet valve (3) is connected to a flow guide tube (4) extending into the bottom of the inner bag (2), and the length of the flow guide tube (4) is smaller than the height of the plastic film sheet (22) of the inner bag (2).

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