Bubble water bottle with reflection structure
By introducing a reflective structure and an intake mechanism into the bubble water bottle, the contact time between carbon dioxide gas and water is extended, and the problem of short contact reaction time between carbon dioxide and water in the prior art is solved, and the carbonization efficiency and gas use efficiency are improved.
Patent Information
- Application Number
- CN202323334290.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-07
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-07
AI Technical Summary
The carbon dioxide and water contact reaction time in existing bubble water bottles is short, the carbonization efficiency is low, and the gas usage loss is large.
A bubble water bottle with a reflective structure is designed. By setting a reflective structure and an intake mechanism in the water bottle, carbon dioxide gas is sprayed into the water bottle through the air outlet and then diffusely reflected through the reflective structure, increasing the contact path between gas and water, and through pouring The angle and nozzle structure increase the contact area between the gas and the reflector and extend the contact time.
It improves the carbonation efficiency of drinking water, reduces gas losses, and achieves more efficient preparation of sparkling water.
Smart Images

Figure CN222129930U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bubble water preparation devices, in particular to a bubble water bottle with a reflection structure. Background Art
[0002] Sparkling water is a beverage with a refreshing taste, delicate bubbles, and various fruit flavors. It is a popular healthy beverage that is increasingly accepted by the public. In addition to purchasing sparkling water directly, consumers can also make their own sparkling water at home.
[0003] The Chinese invention patent application with application publication number CN111345694A discloses a portable bubble water bottle and its control valve, including an outer bottle shell, a partition tank body, a bottom cover and a gas supply device, wherein the upper and lower parts of the partition tank body are respectively divided into a liquid storage space and a gas supply space, and the partition tank body has a connecting hole, and the gas supply device is arranged in the gas supply space, including a gas cylinder and a control valve. The gas cylinder is placed in the gas supply space with the gas cylinder outlet facing downward, and the gas cylinder outlet of the gas cylinder is connected to the liquid storage space through the connecting hole of the control valve and the partition tank body. In order to prevent the liquid in the liquid storage space from flowing to the control valve, a one-way valve is also included. In actual use, carbon dioxide enters the liquid storage space through the one-way valve, and can be mixed and dissolved with the liquid in the liquid storage space to produce a bubble drink. The invention can realize the preparation of bubble water at home, but after the high-pressure gas in the gas cylinder is injected into the water part in the bubble water bottle, the time of contact reaction with water is short, the carbonation efficiency of water is low, and the gas usage loss is large.
[0004] Therefore, the prior art still has improvements and developments for the above-mentioned defects. Utility Model Content
[0005] The utility model aims to provide a bubble water bottle with a reflection structure in view of the defects and shortcomings of the prior art.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0007] The utility model provides a bubble water bottle with a reflective structure, comprising a water bottle, a containing chamber for containing liquid formed inside the water bottle, an air inlet end provided on the water bottle, an air inlet mechanism connected to the air inlet end of the water bottle, the air inlet mechanism communicated with the containing chamber, a reflective structure fixedly provided inside the containing chamber, the reflective structure corresponding to the air outlet of the air inlet mechanism. Through the above-mentioned structural setting, the utility model can be used to prepare bubble water. During the preparation, high-pressure carbon dioxide gas is injected into the drinking water in the water bottle through the air outlet of the air inlet mechanism, and the carbon dioxide gas is diffusely reflected by being blocked by the reflective structure in the water bottle, which can increase the path of the carbon dioxide gas moving in the water bottle, prolong the contact time between the carbon dioxide gas and the drinking water, and improve the efficiency of the drinking water being carbonated.
[0008] According to the above solution, the reflection structure includes a reflection cover, and the reflection cover is provided with a reflection protrusion, and the reflection protrusion corresponds to the gas outlet of the air intake mechanism. The above structural setting is conducive to the slow reflection of carbon dioxide gas.
[0009] According to the above solution, the edge of the reflector is chamfered. Through the above structural setting, the contact area between the reflector and the carbon dioxide gas is increased, so that more carbon dioxide gas is reflected by the reflector and then detoured.
[0010] According to the above scheme, it also includes a fixing seat, which is detachably fixedly connected to the air inlet end of the water bottle, and the air inlet mechanism includes a nozzle and an air guide channel, the nozzle is connected to the air guide channel, and the nozzle and the air guide channel are both formed on the fixing seat, and the air outlet of the air inlet mechanism is arranged on the nozzle. Specifically, the fixing seat is detachably fixed to the air supply device, the fixing seat is threadedly locked with the air inlet end of the water bottle, and the air inlet end of the air guide channel is connected to the air supply device. Through the above structural arrangement, after the preparation of the bubble water is completed, the utility model can be separated from the air supply device for use, and the reflective structure is fixed on the fixing seat, and the fixing seat is detachably connected to the water bottle, which is convenient for the installation and cleaning of the reflective structure.
[0011] According to the above solution, the reflective structure is fixedly connected to the fixing seat via a fixing member, wherein the fixing member is a fixing column, one end of the fixing column is fixedly connected to the reflective structure, and the other end is fixedly connected to the fixing seat. The above structural setting facilitates the installation of the reflective structure.
[0012] According to the above scheme, it also includes a bottle cap, the water bottle is also provided with an exhaust end, the exhaust end is connected to a pressure relief mechanism, the pressure relief mechanism is communicated with the accommodating chamber, the bottle cap is detachably fixedly connected to the exhaust end of the water bottle, the pressure relief mechanism is arranged inside the bottle cap, a pressure relief chamber is formed inside the bottle cap, the pressure relief mechanism is communicated with the pressure relief chamber, and the pressure relief chamber is communicated with the outside world. With the above structural arrangement, when using, consumers can directly open the bottle cap to add drinking water or drink the prepared sparkling water, and the gas released by the pressure relief mechanism when preparing the sparkling water can directly pass into the bottle cap and then to the outside world.
[0013] According to the above scheme, the pressure relief mechanism includes an automatic pressure relief valve and a first through hole provided in the bottle cap, the air inlet end of the first through hole is connected to the accommodating chamber, the air outlet end of the first through hole is connected to the pressure relief chamber, and the automatic pressure relief valve is installed in the first through hole. Through the above structural arrangement, when the air pressure in the accommodating chamber is lower than the safety air pressure, the automatic pressure relief valve blocks the air inlet of the first through hole, the water bottle is in a pressure-maintaining state, and the reaction time between the drinking water and the gas is prolonged. When the air pressure in the accommodating chamber is higher than the safety air pressure, the gas lifts the automatic pressure relief valve, and the gas passes through the first through hole to the pressure relief chamber, which can play the role of automatic pressure relief.
[0014] According to the above scheme, the automatic pressure relief valve includes an upper air relief seat, a first elastic member and a lower air relief seat, the upper air relief seat is provided with an air relief hole, the upper air relief seat is fixed to the exhaust end of the first through hole, one end of the air relief hole is connected to the pressure relief chamber, and the other end of the air relief hole is connected to the first through hole, the lower air relief seat is slidable up and down and is arranged at the air inlet end of the first through hole, the upper air relief seat is elastically connected to the lower air relief seat through the first elastic member, and when the gas pressure in the accommodating chamber is a safe air pressure, the lower air relief seat blocks the air inlet at the air inlet end of the first through hole. Through the above-mentioned structural arrangement, when the air pressure in the accommodating chamber is lower than the safety air pressure, the lower pressure relief seat blocks the air inlet at the air inlet end of the first through hole; when the gas in the accommodating chamber is greater than the safety air pressure, the lower pressure relief seat is lifted up by the gas, and the gas flows from the gap between the lower pressure relief seat and the inner side wall of the first through hole to the inside of the first through hole, and flows into the pressure relief chamber through the air relief hole of the upper air relief seat, thereby completing automatic pressure relief.
[0015] According to the above scheme, the pressure relief mechanism includes a manual pressure relief valve, a second through hole provided in the bottle cap, and a pressure relief channel provided in the bottle cap, the lower end of the second through hole is communicated with the accommodating chamber, the upper end of the second through hole is communicated with the outside, an air outlet is provided on the inner side wall of the second through hole, the air inlet of the pressure relief channel is connected with the air outlet of the second through hole, the exhaust end of the pressure relief channel is communicated with the pressure relief chamber, the manual pressure relief valve can be slidably installed in the second through hole up and down, and the upper end of the manual pressure relief valve is pressed, and the gas passes through the second through hole and the pressure relief channel in turn to reach the pressure relief chamber. Through the above structural arrangement, when it is necessary to drink sparkling water, the manual pressure relief valve is pressed, and the gas does not go out from the upper end of the second through hole, but flows to the air relief chamber in the bottle cap through the pressure relief channel in the bottle cap, so that the gas and the entrained liquid will not directly touch the user's hand, thereby improving the user experience.
[0016] According to the above scheme, the manual pressure relief valve includes a connecting rod, a second elastic member and a first sealing ring, the upper end of the connecting rod is provided with a pressing portion, the lower end is provided with a pressure relief portion, the connecting rod is inserted into the second through hole, the pressing portion is located above the second through hole, the pressure relief portion is located at the lower end of the second through hole, the second elastic member is sleeved in the middle of the connecting rod, and the second elastic member is located inside the second through hole, the inner side of the first sealing ring is in close contact with the connecting rod, the outer side of the first sealing ring sleeve is in close contact with the inner side wall of the second through hole, and the first sealing ring is arranged away from the pressure relief portion and the gas outlet of the second through hole, the pressing portion is pressed down, and the pressure relief portion is separated from the lower end of the second through hole. Through the above structural arrangement, it is convenient for users to operate the manual pressure relief valve, and it is effective to prevent gas from flowing out from the upper end of the second through hole.
[0017] Beneficial effects of the utility model:
[0018] The utility model can be used to prepare sparkling water. During the preparation, high-pressure carbon dioxide gas is injected into the drinking water in the water bottle through the air outlet of the air intake mechanism, and the carbon dioxide gas is blocked by the reflective structure in the water bottle and diffusely reflected, which can increase the movement path of the carbon dioxide gas in the water bottle, extend the contact time between the carbon dioxide gas and the drinking water, and improve the efficiency of the carbonation of the drinking water. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;
[0020] Figure 2 This is a schematic diagram of the appearance structure of the reflector cover of the utility model;
[0021] Figure 3 It is a partial structural diagram of the utility model in use state;
[0022] Figure 4 It is a schematic cross-sectional structure diagram of the pressure relief mechanism of the utility model.
[0023] In the figure: 1. water bottle; 2. fixing seat; 3. bottle cap; 4. nozzle; 5. air guide channel; 6. reflective cover; 7. fixing column; 8. automatic pressure relief valve; 9. manual pressure relief valve; 11. accommodating chamber; 31. pressure relief chamber; 32. first through hole; 33. second through hole; 34. pressure relief channel 61. reflective protrusion; 81. upper air relief seat; 82. first elastic member; 83. lower air relief seat; 91. connecting rod; 92. second elastic member; 93. first sealing ring; 811. air relief hole; 831. second sealing ring; 911. pressing part; 912. pressure relief part; 913. third sealing ring. DETAILED DESCRIPTION
[0024] The technical solution of the utility model is described below in conjunction with the accompanying drawings and embodiments.
[0025] Example 1
[0026] like Figure 1-4 As shown, the utility model provides a bubble water bottle with a reflective structure, including a water bottle 1, wherein a containing chamber 11 for containing liquid is formed inside the water bottle 1, and an air inlet end and an air outlet end are provided on the water bottle 1, and an air inlet mechanism is connected to the air inlet end of the water bottle 1, and a pressure relief mechanism is connected to the air outlet end of the water bottle 1, and the air inlet mechanism and the pressure relief mechanism are both communicated with the containing chamber 11, and a reflective structure is fixedly provided inside the containing chamber 11, and the reflective structure corresponds to the air outlet of the air inlet mechanism. Through the above-mentioned structural setting, the utility model can be used to prepare bubble water. During the preparation, the high-pressure carbon dioxide gas is injected into the drinking water in the water bottle 1 through the air outlet of the air inlet mechanism, and the carbon dioxide gas is blocked by the reflective structure in the water bottle 1 and can be diffusely reflected, which can increase the path of the carbon dioxide gas moving in the water bottle 1, prolong the contact time of the carbon dioxide gas with the drinking water, and improve the efficiency of the carbonation of the drinking water.
[0027] Furthermore, the reflective structure includes a reflective cover 6, on which a reflective protrusion 61 is fixedly provided, and the reflective protrusion 61 corresponds to the air outlet of the air intake mechanism. The above-mentioned structural setting is conducive to the slow reflection of carbon dioxide gas. In this embodiment, the reflective cover 6 is preferably a circular structure, the reflective protrusion 61 is an inverted cone structure, and the cone top is a hemispherical structure, and the reflective protrusion 61 is fixed at the center of the reflective cover 6.
[0028] Furthermore, the edge of the reflector 6 is chamfered. Through the above structure, the contact area between the reflector 6 and the carbon dioxide gas is increased, so that more carbon dioxide gas is reflected by the reflector 6 and then detoured.
[0029] Furthermore, the utility model further comprises a fixing seat 2, the fixing seat 2 is detachably fixedly connected to the air inlet end of the water bottle 1, the air inlet mechanism comprises a nozzle 4 and an air guide channel 5, the nozzle 4 is connected to the air guide channel 5, and the nozzle 4 and the air guide channel 5 are both formed on the fixing seat 2, and the air outlet of the air inlet mechanism is arranged on the nozzle 4. Specifically, the fixing seat 2 is detachably fixed to the air supply device, the fixing seat 2 is threadedly lockedly connected to the air inlet end of the water bottle 1, and the air inlet end of the air guide channel 5 is connected to the air supply device. With the above-mentioned structural arrangement, after the preparation of the bubble water is completed, the utility model can be used after being separated from the air supply device, and the reflective structure is fixed on the fixing seat 2, and the fixing seat 2 is detachably connected to the water bottle 1, which is convenient for the installation and cleaning of the reflective structure.
[0030] Furthermore, the reflective structure is fixedly connected to the fixing base 2 via a fixing member, wherein the fixing member is a fixing column 7, one end of the fixing column 7 is fixedly connected to the reflector 6, and the other end is fixedly connected to the fixing base 2. The above-mentioned structural arrangement facilitates the installation of the reflector 6.
[0031] Furthermore, the utility model further comprises a bottle cap 3, the bottle cap 3 is detachably fixedly connected to the exhaust end of the water bottle 1, the pressure relief mechanism is arranged inside the bottle cap 3, a pressure relief chamber 31 is formed inside the bottle cap 3, the pressure relief mechanism is communicated with the pressure relief chamber 31, and the pressure relief chamber 31 is communicated with the outside world. With the above-mentioned structural arrangement, when in use, consumers can add drinking water or drink the prepared bubble water by opening the bottle cap 3, and the gas released by the pressure relief mechanism when preparing the bubble water can be directly passed into the bottle cap 3 and then to the outside world. In the preferred embodiment of the present invention, the bottle cap 3 and the exhaust end of the water bottle 1 are connected by a threaded locking connection.
[0032] Furthermore, the pressure relief mechanism includes an automatic pressure relief valve 8 and a first through hole 32 provided in the bottle cap 3, the air inlet end of the first through hole 32 is communicated with the accommodating chamber 11, the air outlet end of the first through hole 32 is communicated with the pressure relief chamber 31, and the automatic pressure relief valve 8 is installed in the first through hole 32. Through the above-mentioned structural arrangement, when the air pressure in the accommodating chamber 11 is lower than the safety air pressure, the automatic pressure relief valve 8 blocks the air inlet of the first through hole 32, and the water bottle 1 is in a pressure-maintaining state, prolonging the reaction time between drinking water and gas, and when the air pressure in the accommodating chamber 11 is higher than the safety air pressure, the gas lifts the automatic pressure relief valve 8, and the gas passes through the first through hole to the pressure relief chamber 31, which can play the role of automatic pressure relief. In this embodiment, preferably, two automatic pressure relief valves 8 and two first through holes 32 are provided.
[0033] Further, the automatic pressure relief valve 8 includes an upper air relief seat 81, a first elastic member 82 and a lower air relief seat 83. The upper air relief seat 81 is provided with an air relief hole 811. The upper air relief seat 81 is fixed to the exhaust end of the first through hole 32. One end of the air relief hole 811 is connected to the pressure relief chamber, and the other end of the air relief hole 811 is connected to the first through hole 32. The lower air relief seat 83 is slidable up and down at the air inlet end of the first through hole 32. The upper air relief seat 81 is elastically connected to the lower air relief seat 83 through the first elastic member 82. When the gas pressure in the accommodating chamber 11 is a safe air pressure, the lower air relief seat 83 blocks the air inlet at the air inlet end of the first through hole 32. Through the above-mentioned structural setting, when the air pressure in the accommodating chamber 11 is lower than the safety air pressure, the lower pressure relief seat blocks the air inlet at the air inlet end of the first through hole 32. When the gas in the accommodating chamber 11 is greater than the safety air pressure, the lower pressure relief seat is lifted up by the gas, and the gas flows from the gap between the lower pressure relief seat and the inner wall of the first through hole 32 to the inside of the first through hole 32, and flows through the air relief hole 811 of the upper air relief seat 81 to the pressure relief chamber 31, completing automatic pressure relief. In this embodiment, preferably, a second sealing ring 831 is embedded on the side of the lower pressure relief seat opposite to the air inlet of the first through hole 32, and the second sealing ring 831 blocks the air inlet of the first through hole 32.
[0034] Further, the pressure relief mechanism includes a manual pressure relief valve 9, a second through hole 33 provided in the bottle cap 3 and a pressure relief channel 34 provided in the bottle cap 3, the lower end of the second through hole 33 is connected to the accommodating chamber 11, the upper end of the second through hole 33 is connected to the outside, the inner wall of the second through hole 33 is provided with an air outlet, the air inlet of the pressure relief channel 34 is connected to the air outlet of the second through hole 33, the exhaust end of the pressure relief channel 34 is connected to the pressure relief chamber 31, the manual pressure relief valve 9 can be slidably installed in the second through hole 33 up and down, and the upper end of the manual pressure relief valve 9 is pressed, and the gas passes through the second through hole 33 and the pressure relief channel 34 in turn to reach the pressure relief chamber 31. Through the above-mentioned structural arrangement, when it is necessary to drink sparkling water, the manual pressure relief valve 9 is pressed, and the gas does not go out from the upper end of the second through hole 33, but flows to the air relief chamber in the bottle cap 3 through the pressure relief channel 34 in the bottle cap 3, so that the gas and the entrained liquid will not directly touch the user's hand, thereby improving the user experience.
[0035] Further, the manual pressure relief valve 9 includes a connecting rod 91, a second elastic member 92 and a first sealing ring 93. The connecting rod 91 is provided with a pressing portion 911 at the upper end and a pressure relief portion 912 at the lower end. The connecting rod 91 is inserted into the second through hole 33, the pressing portion 911 is located above the second through hole 33, and the pressure relief portion 912 is located at the lower end of the second through hole 33. The second elastic member 92 is sleeved in the middle of the connecting rod 91, and the second elastic member 92 is located inside the second through hole 33. The inner side of the first sealing ring 93 is tightly attached to the connecting rod 91, and the outer side of the first sealing ring 93 sleeve is tightly attached to the inner side wall of the second through hole 33, and the first sealing ring 93 is arranged away from the pressure relief portion 912 and the air outlet of the second through hole 33. The pressing portion 911 is pressed downward, and the pressure relief portion 912 is separated from the lower end of the second through hole 33. The above structure makes it convenient for users to operate the manual pressure relief valve 9 and effectively prevents gas from flowing out of the upper end of the second through hole 33. In this embodiment, a third sealing ring 913 is preferably provided between the pressure relief portion 912 and the lower end of the second through hole 33.
[0036] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.
Claims
1. A bubble water bottle with a reflective structure, comprising a water bottle, wherein a containing chamber for containing liquid is formed inside the water bottle, an air inlet end is provided on the water bottle, an air inlet mechanism is connected to the air inlet end of the water bottle, and the air inlet mechanism is communicated with the containing chamber, wherein: A reflective structure is fixedly disposed inside the accommodating chamber, and the reflective structure corresponds to the air outlet of the air intake mechanism.
2. The bubble water bottle with a reflective structure according to claim 1, characterized in that: The reflective structure comprises a reflective cover, on which a reflective protrusion is provided, and the reflective protrusion corresponds to the air outlet of the air intake mechanism.
3. The bubble water bottle with a reflective structure according to claim 2, characterized in that: The edge of the reflector is chamfered.
4. The bubble water bottle with a reflective structure according to claim 1, characterized in that: It also includes a fixing seat, which is detachably fixedly connected to the air inlet end of the water bottle, and the air inlet mechanism includes a nozzle and an air guide channel, the nozzle is connected to the air guide channel, and the nozzle and the air guide channel are both formed on the fixing seat, and the air outlet of the air inlet mechanism is arranged on the nozzle.
5. The bubble water bottle with a reflective structure according to claim 4, characterized in that: The reflective structure is fixedly connected to the fixing seat via a fixing member, wherein the fixing member is a fixing column, one end of the fixing column is fixedly connected to the reflective structure, and the other end of the fixing column is fixedly connected to the fixing seat.
6. The bubble water bottle with a reflective structure according to claim 1, characterized in that: It also includes a bottle cap, and the water bottle is also provided with an exhaust end, the exhaust end is connected to a pressure relief mechanism, the pressure relief mechanism is communicated with the accommodating chamber, the bottle cap is detachably fixedly connected to the exhaust end of the water bottle, the pressure relief mechanism is arranged inside the bottle cap, a pressure relief chamber is formed inside the bottle cap, the pressure relief mechanism is communicated with the pressure relief chamber, and the pressure relief chamber is communicated with the outside.
7. The bubble water bottle with a reflective structure according to claim 6, characterized in that: The pressure relief mechanism includes an automatic pressure relief valve and a first through hole provided in the bottle cap, the air inlet end of the first through hole is connected to the accommodating chamber, the exhaust end of the first through hole is connected to the pressure relief chamber, and the automatic pressure relief valve is installed in the first through hole.
8. The bubble water bottle with a reflective structure according to claim 7, characterized in that: The automatic pressure relief valve includes an upper air relief seat, a first elastic member and a lower air relief seat, the upper air relief seat is provided with an air relief hole, the upper air relief seat is fixed to the exhaust end of the first through hole, one end of the air relief hole is connected to the pressure relief chamber, and the other end of the air relief hole is connected to the first through hole, the lower air relief seat is slidable up and down and is arranged at the air inlet end of the first through hole, the upper air relief seat is elastically connected to the lower air relief seat through the first elastic member, and when the gas pressure in the accommodating chamber is a safe air pressure, the lower air relief seat blocks the air inlet at the air inlet end of the first through hole.
9. The bubble water bottle with a reflective structure according to claim 6, characterized in that: The pressure relief mechanism includes a manual pressure relief valve, a second through hole provided in the bottle cap and a pressure relief channel provided in the bottle cap, the lower end of the second through hole is communicated with the accommodating chamber, the upper end of the second through hole is communicated with the outside, an air outlet is provided on the inner side wall of the second through hole, the air inlet of the pressure relief channel is connected with the air outlet of the second through hole, the exhaust end of the pressure relief channel is communicated with the pressure relief chamber, the manual pressure relief valve can be slidably installed in the second through hole up and down, and the upper end of the manual pressure relief valve is pressed, and the gas passes through the second through hole and the pressure relief channel in sequence to reach the pressure relief chamber.
10. The bubble water bottle with a reflective structure according to claim 9, characterized in that: The manual pressure relief valve includes a connecting rod, a second elastic member and a first sealing ring. A pressing portion is provided at the upper end of the connecting rod, and a pressure relief portion is provided at the lower end. The connecting rod is inserted into the second through hole, the pressing portion is located above the second through hole, and the pressure relief portion is located at the lower end of the second through hole. The second elastic member is sleeved on the middle part of the connecting rod, and the second elastic member is located inside the second through hole. The inner side of the first sealing ring is tightly against the connecting rod, and the outer side of the first sealing ring sleeve is tightly against the inner side wall of the second through hole, and the first sealing ring is arranged away from the pressure relief portion and the air outlet of the second through hole. The pressing portion is pressed downward, and the pressure relief portion is separated from the lower end of the second through hole.
