CN218506587U - Film bag vacuum pump bottle without bottle bottom - Google Patents

Abstract

The utility model provides a membrane bag vacuum pump bottle of no bottle end, including hollow bottle, the bottle is including bottleneck and body, bottleneck upper end opening, body lower extreme opening just detachable holding has the membrane bag in the body, the membrane bag can curl, membrane bag cavity just is equipped with annotates the liquid mouth, it is equipped with well cover on the liquid mouth to annotate, well cover is including the cock portion, the detachable cup joint of cock portion is in the bottleneck, be equipped with the siphunculus in the cock portion, siphunculus cavity just runs through the cock portion from top to bottom, be connected between siphunculus lower extreme and the notes liquid mouth. The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle adopts unique well cover, no end body and can curl membrane bag isotructure, has broken away from restrictions such as material, shape, uses more in a flexible way, environmental protection more, has more extensive usage space, provides safer sanitary environment.

Description

Film bag vacuum pump bottle without bottle bottom

Technical Field

The utility model belongs to the technical field of cosmetic packaging, a membrane bag vacuum pump bottle of no bottle end is related to.

Background

The vacuum pump bottle is a container capable of isolating a material body from the outside, and can be used in the field of cosmetics. At present, the content of the vacuum pump bottle can be isolated from the air, so that the product is prevented from being oxidized and deteriorated and breeding bacteria due to excessive contact with the air, and the product grade is improved by using the high-tech concept. The vacuum pump bottles available on the market consist of a cylindrical container with a piston arranged at the bottom. The design principle is that the contraction force of a spring is used for preventing air from entering a bottle, the air and cosmetics in the cylinder are pumped out through a pump core, a vacuum state is formed in the cylinder, an internal and external pressure difference is generated, the piston at the bottom of the bottle is pushed to advance towards a bottle opening by utilizing atmospheric pressure, and the air or the cosmetics in the cylinder are pumped out through pressing the pump.

The existing vacuum pump bottle is a piston type vacuum pump bottle, only can be made of plastic, and the bottle body structure is mainly cylindrical and closed at the bottom and is provided with a piston at the bottom. Therefore, there is a need for research and improvement of the structure of the existing vacuum pump bottle.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, an object of the present invention is to provide a vacuum pump bottle without a bottle bottom for solving the problem of lacking a vacuum pump bottle that is free from the limitation of the conventional vacuum pump bottle on bottle structure, material, etc.

For realizing above-mentioned purpose and other relevant mesh, the utility model provides a membrane bag vacuum pump bottle at bottom of no bottle, including hollow bottle, the bottle is including bottleneck and body, bottleneck upper end opening, body lower extreme opening just detachable holding has the membrane bag in the body, the membrane bag can curl, membrane bag cavity just is equipped with annotates the liquid mouth, be equipped with well cover on annotating the liquid mouth, well cover is including the stopper portion, the detachable cup joint of stopper portion is in the bottleneck, be equipped with the siphunculus in the stopper portion, siphunculus cavity just runs through the stopper portion from top to bottom, be connected between siphunculus lower extreme and the notes liquid mouth.

Preferably, the material of the film bag is flexible material that can be rolled.

Preferably, the cross section of the liquid injection port is fusiform.

Preferably, be equipped with the multichannel striation on the lateral wall of cock portion, cock portion is through detachable interference connection between the inside wall of striation and bottleneck.

Preferably, the cross section of the bottle neck and the plug part is circular, and the inner diameter of the bottle neck is larger than the outer diameter of the plug part.

Preferably, the upper end of the plug part is provided with a plug edge extending towards the direction vertical to the plug part.

More preferably, the cross-section of the plug edge is circular, and the diameter of the plug edge is larger than the outer diameter of the bottle neck.

Preferably, the through pipe is located at the center of the plug part.

Preferably, the through pipe is sequentially provided with a first pipe section and a second pipe section along the direction close to the membrane bag, the first pipe section penetrates through the plug part from top to bottom, the second pipe section protrudes out of the plug part downwards, and the second pipe section is matched with the liquid injection port in shape.

More preferably, the cross section of the second tube section is shuttle-shaped.

More preferably, the second pipe section is inserted into the liquid filling port.

Further preferably, the second pipe section and the liquid injection port are connected into a whole.

Preferably, the bottle cap further comprises a bottle cap, the bottle cap comprises a liquid guide tube and a pressing cap, the liquid guide tube is hollow, two ends of the liquid guide tube are open, a spray head is arranged on the side wall of the pressing cap, a pressing pump is arranged in the pressing cap and communicated with the spray head through an injection tube, the feeding end of the pressing pump is inserted into one end of the liquid guide tube, and the other end of the liquid guide tube is inserted into the through tube.

More preferably, the lower end of the pressing pump is inserted into the upper end of the liquid guide pipe, and the lower end of the liquid guide pipe is inserted into the upper end of the through pipe.

More preferably, the push cap is cylindrical.

More preferably, the drain pipe is along being equipped with first connection chamber section, first connection straight section, second connection straight section, transitional coupling section, third connection straight section near the membrane bag direction in proper order, first connection chamber section, first connection straight section, second connection straight section, third connection straight section are cylindrically, first connection chamber section cavity and upper end opening, the transitional coupling section is the round platform shape, the transitional coupling section is from top to bottom the cross-sectional area diminishes gradually, the diameter of first connection chamber section is greater than the diameter of first connection straight section, the diameter of first connection straight section is greater than the diameter of second connection straight section, the diameter of second connection straight section is greater than the diameter of third connection straight section.

Further preferably, the inner diameter of the second connecting straight section is greater than the outer diameter of the lower end of the pressing pump, and the inner diameter of the third connecting straight section is less than the outer diameter of the lower end of the pressing pump.

Further preferably, the outer diameter of the first connecting cavity section is larger than the inner diameter of the first pipe section of the through pipe, and the outer diameter of the first connecting straight section is smaller than the inner diameter of the first pipe section of the through pipe.

As mentioned above, the utility model provides a pair of membrane bag vacuum pump bottle of no bottle end has following beneficial effect:

(1) The utility model provides a pair of membrane bag vacuum pump bottle of no bottle end can be used to the extranal packing of cosmetics product feed liquid such as all kinds of cream, milk, water, and the application type is extensive, has more extensive usage space.

(2) The utility model provides a pair of film bag vacuum pump bottle at bottom of no bottle makes the vacuum pump bottle break away from traditional piston structure and can only use the plastics material, and the shape uses restrictions such as cylindrical as giving first place to. The novel structure not only has the characteristics of high utilization rate of the original vacuum pump bottle, good sanitary condition and the like, but also can freely use the bottles made of different materials and in different shapes, so that the vacuum pump bottle can face different use scenes, and is more flexible to use.

(3) The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle has reduced this part of piston in the vacuum pump, so reduce the use of plastic parts, environmental protection more.

(4) The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle compares with traditional vacuum pump bottle, reduces the part, reduces the contact, reduces emollient, reduces the gap of revealing, and the health level is higher than former piston vacuum pump bottle, can provide safer sanitary environment for cosmetic products.

(5) The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle can adopt multiple material, has solved the difficult problem of vacuum pump bottle pump opening difficulty.

(6) The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle, the well cover structure of its adoption can effectively be fixed the membrane bag in the body.

(7) The utility model provides a pair of membrane bag vacuum pump bottle at bottom of no bottle, the installation of the membrane bag of being convenient for is provided more nimble filling production packing for the vacuum pump bottle to the body bottom opening of bottle.

Drawings

Fig. 1 is a perspective view of the whole structure of the vacuum bottle without a bottom of the vacuum bottle after being installed.

Fig. 2 shows a three-dimensional view of the split structure of the bottle cap, the middle sleeve and the film bag in the film bag vacuum bottle without bottle bottom of the present invention.

Fig. 3 shows a split structure view of the middle sleeve and the membrane bag of the membrane bag vacuum bottle without the bottle bottom of the present invention.

Fig. 4 is a planar perspective view showing the structure of the bottle cap in the film bag vacuum bottle without a bottle bottom according to the present invention.

Fig. 5 is a schematic plane view of the vacuum bottle without a bottom, the middle sleeve and the film bag after the vacuum bottle is mounted.

Fig. 6 is a perspective view showing the outer surface structure of the bottle cap and the bottle body of the vacuum bottle with no bottom of the vacuum bottle.

Fig. 7 is a perspective view showing the external surface structure of the bottle cap and the bottle body combination after the film bag vacuum bottle without a bottle bottom is installed.

Reference numerals

1. Bottle body

11. Bottle neck

12. Bottle body

2. Film bag

21. Liquid filling port

3. Middle sleeve

31. Plug part

32. Plug edge

4. Pipe

41. First pipe section

42. Second pipe section

5. Transverse striation

6. Bottle cap

61. Liquid guiding tube

611. First connecting cavity section

612. First connecting straight section

613. Second straight connecting section

614. Transitional connecting section

615. Third connecting straight section

62. Pressing cap

63. Spray head

64. Pressing pump

65. Injection pipe

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 7. It should be understood that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions of the present invention, so that the present invention does not have the substantial technical significance, and the modification of any structure, the change of the proportion relation or the adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

The utility model provides a membrane bag vacuum flask at bottom of no bottle, as shown in fig. 1-7, including hollow bottle 1, bottle 1 is including bottleneck 11 and body 12, 11 upper end openings of bottleneck, 12 lower extreme openings of body just detachable holding has membrane bag 2 in the body 12, membrane bag 2 can curl, 2 cavity of membrane bag just are equipped with annotates liquid mouth 21, annotate and be equipped with well cover 3 on the liquid mouth 21, well cover 3 is including stopper portion 31, the detachable cup joint of stopper portion 31 is in bottleneck 11, be equipped with siphunculus 4 in the stopper portion 31, siphunculus 4 cavity just runs through stopper portion 31 from top to bottom, siphunculus 4 lower extreme with annotate and be connected between the liquid mouth 21.

In the above film bag vacuum pump bottle, the material of the bottle body 1 is selected from one of glass, plastic, ceramic, metal, bamboo or wood. The limit that the material of the bottle body 1 in the traditional vacuum pump can only be selected from plastic is changed.

In the above-mentioned membrane bag vacuum pump bottle, the bottle body 12 can be made into various shapes according to the needs, and is not limited to the bottle shape.

In the above vacuum pump bottle, the material of the film bag 2 is a flexible material that can be rolled. Specifically, the flexible material includes, without limitation, polyvinyl alcohol, polyester, polyimide, and the like. The film bag 2 is convenient to be rolled and then plugged into the bottle bodies 12 with different shapes through the bottle neck 11, or directly plugged into the bottle bodies 12 through the lower ends of the openings of the bottle bodies 12. The outer contour shape of the film bag 2 can be adjusted according to the shape of the bottle body 12 so as to adapt to bottle bodies 1 with different shapes.

In the membrane bag vacuum pump bottle, as shown in fig. 1 and 3, the cross section of the liquid inlet 21 is in a shuttle shape. Is convenient to be connected with the through pipe 4 in the plug part 31, and the feed liquid in the membrane bag 2 is not easy to leak.

In the membrane bag vacuum pump bottle, the middle sleeve 3 is made of plastic. Specifically, the middle sleeve 3 is made of foldable and bendable soft plastic, so that the middle sleeve 3 can be conveniently inserted into the bottleneck 11 through the bottle body 12, and is connected with the bottleneck 11 through the plug part 31, and the middle sleeve 3 can be fixed at the position of the bottleneck 11 by arranging the plug edge 32.

In the above-mentioned membrane bag vacuum pump bottle, as shown in fig. 1, 2, 3, 5, be equipped with multichannel striation 5 on the lateral wall of cock portion 31, cock portion 31 is through detachable interference connection between striation 5 and the inside wall of bottleneck 11. The plug part 31 forms an interference structure with the inner side wall of the bottle neck 11 through the transverse grains 5, so that firm connection is realized. Thereby ensuring that the middle sleeve 3 can be fixed on the bottle body 1.

In the above-mentioned membrane bag vacuum pump bottle, as shown in fig. 2 and 5, the cross section of the bottle neck 11 and the plug 31 is circular, and the inner diameter of the bottle neck 11 is larger than the outer diameter of the plug 31.

In the membrane bag vacuum pump bottle, as shown in fig. 1, 2, 3 and 5, a plug edge 32 extending in a direction perpendicular to the plug portion 31 is provided at the upper end of the plug portion 31. For fixing the central sleeve 3 on the neck 11 of the bottle.

In one embodiment, as shown in fig. 2 and 5, the plug edge 32 has a circular cross-section, and the diameter of the plug edge 32 is larger than the outer diameter of the bottle neck 11.

In the membrane bag vacuum pump bottle, as shown in fig. 1, 2, 3, and 5, the through pipe 4 is located at the center of the stopper 31.

In the membrane bag vacuum pump bottle, as shown in fig. 3, the through pipe 4 is sequentially provided with a first pipe section 41 and a second pipe section 42 along the direction close to the membrane bag 2, the first pipe section 41 vertically penetrates through the plug part 31, the second pipe section 42 downwardly protrudes out of the plug part 31, and the second pipe section 42 is matched with the shape of the liquid injection port 21.

In one embodiment, as shown in fig. 1, 2, 3, and 5, the second tube section 42 has a cross-section in the shape of a shuttle.

In one embodiment, as shown in FIG. 3, the second tube section 42 is inserted into the pouring outlet 21. Facilitating the communication of the second pipe segment 42 with the pouring port 21.

In a further preferred embodiment, the second pipe section 42 is integrally connected to the pouring outlet 21. Specifically, the second pipe segment 42 is welded to the pour opening 21. The fusiform structure of the two ensures no leakage after welding.

In the membrane bag vacuum pump bottle, as shown in fig. 1 and 4, the membrane bag vacuum pump bottle further comprises a bottle cap 6, the bottle cap 6 comprises a liquid guide tube 61 and a pressing cap 62, the liquid guide tube 61 is hollow, two ends of the liquid guide tube 61 are open, a spray head 63 is arranged on the side wall of the pressing cap 62, a pressing pump 64 is arranged in the pressing cap 62, the pressing pump 64 is communicated with the spray head 63 through a spray pipe 65, the feeding end of the pressing pump 64 is inserted into one end of the liquid guide tube 61, and the other end of the liquid guide tube 61 is inserted into the through pipe 4.

In one embodiment, the cap 6 is made of plastic.

In one embodiment, as shown in fig. 1, the lower end of the pressing pump 64 is inserted into the upper end of the liquid guide tube 61, and the lower end of the liquid guide tube 61 is inserted into the upper end of the through tube 4.

In a further preferred embodiment, as shown in fig. 1 and 4, the outer diameter of the lower end of the pressing pump 64 is smaller than the inner diameter of the upper end of the catheter 61. The insertion is facilitated.

In a further preferred embodiment, as shown in fig. 1 and 2, the outer diameter of the lower end of the catheter 61 is smaller than the inner diameter of the upper end of the through pipe 4. The insertion is facilitated.

In one embodiment, as shown in fig. 6 and 7, the push cap 62 is cylindrical.

In one embodiment, as shown in fig. 2, the catheter 61 is provided with a first connecting cavity 611, a first connecting straight section 612, a second connecting straight section 613, a transition connecting section 614 and a third connecting straight section 615 in sequence along a direction close to the membrane bag 2, the first connecting cavity 611, the first connecting straight section 612, the second connecting straight section 613 and the third connecting straight section 615 are cylindrical, the first connecting cavity 611 is hollow and has an open upper end, the transition connecting section 614 is in a truncated cone shape, the cross-sectional area of the transition connecting section 614 gradually decreases from top to bottom, the diameter of the first connecting cavity 611 is larger than that of the first connecting straight section 612, the diameter of the first connecting straight section 612 is larger than that of the second connecting straight section 613, and the diameter of the second connecting straight section 613 is larger than that of the third connecting straight section 615.

In a further preferred embodiment, as shown in fig. 1, 2 and 3, the inner diameter of the second connecting straight section 613 is larger than the outer diameter of the lower end of the pressing pump 64, and the inner diameter of the third connecting straight section 615 is smaller than the outer diameter of the lower end of the pressing pump 64. So that the insertion part of the pressing pump 64 in the catheter 61 is fixed in the catheter 61.

In a further preferred embodiment, as shown in fig. 1, 2 and 3, the outer diameter of the first connection chamber section 611 is larger than the inner diameter of the first tube section 41 of the through tube 4, and the outer diameter of the first connection straight section 612 is smaller than the inner diameter of the first tube section 41 of the through tube 4. It is convenient to secure the insertion part of the catheter 61 in the through tube 4 in the first tube section 41 of the through tube 4.

The structure between the matched liquid guide tube 61 and the through pipe 4 is convenient for the liquid guide tube 61 to be arranged in the through pipe 4.

In one embodiment, the push pump 64 is a push pump cartridge structure of an existing conventional vacuum pump bottle for cosmetics, and is commercially available. By pressing the pressing cap 62 in the bottle cap 6, the liquid material in the film bag can be quantitatively taken out through the pressing pump 64.

The following describes a specific application process of a film bag vacuum bottle without a bottle bottom according to the present invention with reference to fig. 1-7.

When a user obtains the vacuum bottle with the membrane bag without the bottle bottom as shown in figures 1-7, the membrane bag 2 is connected with the second pipe section 42 at the lower end of the through pipe 4 of the plug part 31 of the middle sleeve 3 into a whole through the liquid injection port 21. Then the membrane bag 2 is curled and then plugged into the bottle body 12 through the bottle neck 11 of the bottle body 1, and the plug part 31 of the middle sleeve 3 is sleeved in the bottle neck 11 to realize interference connection; or the plug part 31 of the middle sleeve 3 made of soft plastic penetrates through the inside of the bottle body 12, is sleeved in the bottle neck 11 to realize interference connection, and meanwhile, the film bag 2 is curled and then is plugged into the bottle body 12 through the lower end opening of the bottle body 12. Then the membrane bag 2 is blown up through the liquid injection port 21 by blowing air through the through pipe 4, the air in the membrane bag 2 is discharged through the liquid injection port 21 and the through pipe 4, the membrane bag 2 expands in the bottle body 12 to fill the whole bottle body 12, and the air is removed, so that the inside of the bottle body 12 is in a vacuum state. After the membrane bag 2 is blown up, the product liquid can be directly filled into the membrane bag 2 through the through pipe 4 and the liquid injection port 21 in sequence, and the product liquid can also be filled into the membrane bag 2 through sealing pressure filling. After the product liquid is filled, the liquid guide tube 61 is inserted into the upper end of the through pipe 4, specifically, each section of the liquid guide tube 61 is matched with the first pipe section 41 of the through pipe 4, and the liquid guide tube 61 is installed in the through pipe 4. Then, the push cap 62 is attached to the catheter 61, i.e., the lower end of the push pump 64 is inserted into the upper end of the catheter 61. And (5) finishing the assembly of the membrane bag vacuum pump bottle.

When the product feed liquid in the bottle is taken in a quantitative mode, the cap 62 can be pressed through pressing, the pump 64 is pressed through extrusion, the ventilation is realized through the through pipe 4 of the plug part 31 of the middle sleeve 3, the atmospheric pressure between the bottle body 1 and the membrane bag 2 can be ensured due to the bottomless bottle body 1, the membrane bag 2 is contracted due to the action of the atmospheric pressure due to the pressing of the pump 64 through extrusion, the product feed liquid can be compressed together due to the action of the atmospheric pressure outside the membrane bag 2, the internal and external pressure difference is generated, the atmospheric pressure in the bottle body 12 is maintained, the product feed liquid in the membrane bag 2 can be pumped out through smooth work of the pump 64, and the product feed liquid is output through the spray head 63 through the spray pipe 65.

To sum up, the utility model provides a pair of membrane bag vacuum flask at bottom of no bottle adopts unique well cover, no end body and can curl membrane bag isotructure, has broken away from restriction such as material, shape, uses more in a flexible way, environmental protection more, has more extensive usage space, provides safer sanitary environment. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (9)

1. The utility model provides a membrane bag vacuum pump bottle of no bottle end, a serial communication port, including hollow bottle (1), bottle (1) is including bottleneck (11) and body (12), bottleneck (11) upper end opening, body (12) lower extreme opening just the detachable membrane bag (2) that have held in body (12), membrane bag (2) can curl, membrane bag (2) cavity just is equipped with annotates liquid mouth (21), it is equipped with well cover (3) on liquid mouth (21), well cover (3) are including stopper portion (31), stopper portion (31) detachable cup joints in bottleneck (11), be equipped with in stopper portion (31), siphunculus (4) cavity just runs through stopper portion (31) from top to bottom, siphunculus (4) lower extreme and annotate and be connected between siphunculus (21).

2. The bottom-less membrane bag vacuum pump bottle as claimed in claim 1, wherein the material of the membrane bag (2) is a flexible material capable of being rolled.

3. The film bag vacuum pump bottle without a bottle bottom as claimed in claim 1, wherein the outer side wall of the plug portion (31) is provided with a plurality of transverse threads (5), and the plug portion (31) is detachably connected with the inner side wall of the bottle neck (11) through interference between the transverse threads (5).

4. The bottom-less membrane bag vacuum pump bottle as claimed in claim 1, wherein the cross section of the bottle neck (11) and the plug portion (31) is circular, and the inner diameter of the bottle neck (11) is larger than the outer diameter of the plug portion (31).

5. The bottom-less membrane bag vacuum pump bottle as claimed in claim 1, wherein the upper end of the plug portion (31) is provided with a plug edge (32) extending in a direction perpendicular to the plug portion (31); and/or the cross section of the plug edge (32) is circular, and the diameter of the plug edge (32) is larger than the outer diameter of the bottle neck (11).

6. The film bag vacuum pump bottle without a bottle bottom as claimed in claim 1, wherein the through pipe (4) is sequentially provided with a first pipe section (41) and a second pipe section (42) along a direction close to the film bag (2), the first pipe section (41) vertically penetrates through the plug part (31), the second pipe section (42) downwardly protrudes out of the plug part (31), and the second pipe section (42) is matched with the shape of the liquid filling opening (21).

7. The film bag vacuum pump bottle without a bottle bottom as claimed in claim 1, further comprising a bottle cap (6), wherein the bottle cap (6) comprises a liquid guide tube (61) and a pressing cap (62), the liquid guide tube (61) is hollow and has two open ends, a spray head (63) is arranged on the side wall of the pressing cap (62), a pressing pump (64) is arranged in the pressing cap (62), the pressing pump (64) is communicated with the spray head (63) through an injection tube (65), the feeding end of the pressing pump (64) is inserted into one end of the liquid guide tube (61), and the other end of the liquid guide tube (61) is inserted into the through tube (4).

8. The bottom-free membrane bag vacuum pump bottle as claimed in claim 7, wherein the lower end of the pressing pump (64) is inserted into the upper end of the liquid guide pipe (61), and the lower end of the liquid guide pipe (61) is inserted into the upper end of the through pipe (4).

9. The bottom-free membrane bag vacuum pump bottle as claimed in claim 7, wherein the liquid guide tube (61) is provided with a first connecting cavity section (611), a first connecting straight section (612), a second connecting straight section (613), a transition connecting section (614) and a third connecting straight section (615) in sequence along a direction close to the membrane bag (2), the first connecting cavity section (611), the first connecting straight section (612), the second connecting straight section (613) and the third connecting straight section (615) are cylindrical, the first connecting cavity section (611) is hollow and has an open upper end, the transition connecting section (614) is in a circular truncated cone shape, the cross-sectional area of the transition connecting section (614) is gradually reduced from top to bottom, the diameter of the first connecting cavity section (611) is greater than that of the first connecting straight section (612), the diameter of the first connecting straight section (612) is greater than that of the second connecting straight section (613), and the diameter of the second connecting straight section (613) is greater than that of the third connecting straight section (615).

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