Refrigerator pressure switch and refrigerator

Abstract

The application relates to the technical field of refrigerator air pressure switches, in particular to a refrigerator air pressure switch and a refrigerator. The refrigerator air pressure switch comprises a shell, a fixed electrode, a movable electrode and at least one connecting point, the shell has a cavity and is used for being mounted to a cabinet; the fixed electrode is fixedly mounted in the shell and divides the cavity into a first cavity and a second cavity, the second cavity is used for being communicated with the inside of the cabinet; the movable electrode is arranged in the second cavity and comprises a fixed ring and a movable piece, the fixed ring is fixed to the shell, the movable piece is located in the inner ring of the fixed ring and is arranged in a spaced mode with the fixed electrode; the fixed ring and the movable piece are connected through the connecting point; the movable piece can move towards the fixed electrode relative to the fixed ring with the connecting point as the moving point and change the distance between the movable piece and the fixed electrode in response to the pressure change in the second cavity. The application can improve the stability and reliability of the refrigerator air pressure switch in controlling the opening of the door.

Description

Technical Field

[0001] This application relates to the field of refrigerator pressure switch technology, and in particular to a refrigerator pressure switch and a refrigerator. Background Technology

[0002] In automatic door opening systems for refrigerators, pneumatic switches are a commonly used door status sensing element. When a user applies external force to the refrigerator door, a pressure difference quickly forms between the inside and outside of the refrigerator. This pressure difference acts on the internal mechanism of the switch, triggering a change in its state, which in turn outputs an electrical signal to drive the door to open automatically.

[0003] Existing solutions typically employ a movable metal sheet paired with a fixed electrode, maintaining a specific distance between them to form a variable capacitor. When the refrigerator door is pushed, the change in internal air pressure causes the metal sheet to shift, altering the distance between it and the fixed electrode, thus changing the capacitance value. The control system monitors this capacitance parameter change and outputs an opening command when the detected value exceeds a preset threshold. However, since the metal sheet can only undergo minute deformations, it is necessary to lower the circuit's detection threshold to improve the sensitivity to minute capacitance changes. This increased sensitivity makes the structure more susceptible to interference from environmental electromagnetic noise, component assembly deviations, and other factors. This can cause the system to misinterpret normal capacitance fluctuations as valid signals, increasing the risk of malfunctions and affecting the stability and reliability of the door opening control. Utility Model Content

[0004] Therefore, it is necessary to provide a refrigerator pressure switch and refrigerator with high stability and reliability.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A refrigerator pressure switch, installed on the refrigerator body, is capable of controlling the opening of the refrigerator door in response to airflow generated by changes in internal air pressure; the refrigerator pressure switch includes:

[0007] A housing having a cavity and for mounting to the enclosure;

[0008] A fixed electrode is fixedly installed inside the housing, and the chamber is divided into a first chamber and a second chamber, the second chamber being used to communicate with the interior of the housing;

[0009] A movable electrode is disposed in the second cavity and includes a fixed ring and a movable piece. The fixed ring is fixed to the housing. The movable piece is located in the inner ring of the fixed ring and is spaced apart from the fixed electrode. In the radial direction of the fixed ring, the outer peripheral wall of the movable piece is spaced apart from the inner ring of the fixed ring.

[0010] At least one connection point is provided between the fixed ring and the movable piece, connecting the fixed ring and the movable piece;

[0011] The movable piece is capable of responding to changes in the pressure within the second cavity by moving relative to the fixed ring towards the fixed electrode, with the connection point as its movable point, thereby changing the distance between the movable piece and the fixed electrode.

[0012] Understandably, this application, by setting a movable electrode including a fixed ring and a movable plate, utilizes the principle that when the internal air pressure of the refrigerator changes, airflow is generated due to the pressure difference between the inside and outside of the refrigerator. The movable plate responds to the airflow by changing its position, and the capacitance value can be altered by the amount of position change of the movable plate. Therefore, the threshold value of the capacitance value can be changed by altering the airflow rate without increasing the response sensitivity when testing capacitance changes. This avoids interference from factors such as electromagnetic interference and assembly deviations when measuring capacitance changes, thereby improving the stability and reliability of the refrigerator's pressure switch controlling the door opening.

[0013] In one embodiment, the number of connection points is set to one, and the movable piece is able to rotate relative to the fixed ring with the connection point as the rotation center in response to changes in the pressure inside the second cavity.

[0014] In one embodiment, the number of connection points is set to multiple, and the multiple connection points are arranged at circumferential intervals in the fixed ring;

[0015] The connection point is arranged in an arc shape, and the movable piece can respond to changes in pressure within the second cavity by raising or lowering relative to the fixed ring in the axial direction of the second cavity.

[0016] In one embodiment, the side wall of the housing has a through mounting cavity, and an extension piece is provided on the fixing ring, the extension piece extending into the mounting cavity for electrical connection of external devices.

[0017] In one embodiment, the refrigerator pressure switch further includes a first sealing ring disposed in the second cavity, which enables a sealed connection between the cavity wall of the second cavity and the fixing ring.

[0018] In one embodiment, the refrigerator pressure switch further includes an annular gasket and a compression post. The annular gasket is disposed between the fixed ring and the fixed electrode, and the compression post is disposed in the first cavity and is capable of applying a compression force to the fixed electrode along the axis of the cavity and toward the fixed ring.

[0019] In one embodiment, the housing includes an upper shell and a lower shell, the upper shell being mounted to the box body, the upper shell and the lower shell being detachably connected and forming the chamber;

[0020] The extrusion column is installed on the upper shell.

[0021] In one embodiment, the extrusion column is integrally formed with the upper shell.

[0022] This application also provides the following technical solutions:

[0023] A refrigerator includes a cabinet, a door, and a refrigerator pressure switch as described in any of the above embodiments. The door is mounted on the cabinet and can move relative to the cabinet in response to an external force to change the internal air pressure of the cabinet. The refrigerator pressure switch is mounted on the cabinet and is used to control the opening of the refrigerator door in response to the airflow generated by the change in internal air pressure.

[0024] In one embodiment, the refrigerator further includes a first embedded box, a second embedded box, and a connecting pipe. The first embedded box is installed on the cabinet and is provided with a first pipe interface. The second embedded box is installed inside the cabinet and is provided with a second pipe interface. One end of the connecting pipe is connected to the first pipe interface, and the other end is connected to the second pipe interface.

[0025] The housing is provided with a connector that communicates with the second cavity. The connector is inserted into the first pipeline interface and is connected to the connecting pipe.

[0026] Compared to existing technologies, the refrigerator pressure switch utilizes a movable electrode comprising a fixed ring and a movable plate. When the internal air pressure of the refrigerator changes, airflow is generated due to the pressure difference between the inside and outside of the refrigerator. The movable plate responds to the airflow by changing its position, and the capacitance value can be altered by the amount of position change of the movable plate. Therefore, the threshold value of the capacitance value can be changed by altering the airflow rate without increasing the response sensitivity when testing capacitance changes. This avoids interference from factors such as electromagnetic interference and assembly deviations when measuring capacitance changes, thereby improving the stability and reliability of the refrigerator pressure switch in controlling door opening. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the refrigerator structure provided in this application.

[0029] Figure 2 A top view of the refrigerator provided in this application.

[0030] Figure 3 For this application Figure 2 Sectional view at point AA.

[0031] Figure 4 For the purposes of this application Figure 3 Enlarged view of point B in the middle.

[0032] Figure 5 For the purposes of this application Figure 4 Enlarged view of point C in the middle.

[0033] Figure 6 This is a schematic diagram of the refrigerator pressure switch of this application.

[0034] Figure 7 An exploded view of the refrigerator pressure switch provided in this application.

[0035] Figure 8 This is a schematic diagram of the structure of the active electrode provided in this application.

[0036] The component labels are as follows:

[0037] 100. Refrigerator pressure switch; 10. Housing; 11. Chamber; 111. First chamber; 112. Second chamber; 12. Mounting chamber; 13. Upper shell; 14. Lower shell; 15. Connecting pipe; 20. Fixed electrode; 21. Through hole; 30. Movable electrode; 31. Fixing ring; 311. Extension piece; 32. Movable piece; 33. Connection point; 40. First sealing ring; 50. Annular gasket; 60. Extrusion column;

[0038] 200, Refrigerator; 201, Cabinet; 210, First Embedded Box; 211, First Pipe Interface; 220, Second Embedded Box; 221, Second Pipe Interface; 230, Connecting Pipe. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figures 1 to 8 This application provides a refrigerator pressure switch 100, which is installed on a refrigerator 200. When the refrigerator door is pushed, the internal air pressure of the refrigerator 200 changes, thereby generating airflow. The refrigerator pressure switch 100 can control the opening of the refrigerator 200 door in response to the airflow generated by the change in internal air pressure.

[0045] Specifically, the refrigerator pressure switch 100 includes a housing 10, a fixed electrode 20, a movable electrode 30, and at least one connection point 33. The housing 10 has a cavity 11 for installation onto the cabinet 201. The fixed electrode 20 is fixedly installed inside the housing 10 and divides the cavity 11 into a first cavity 111 and a second cavity 112, the second cavity 112 being used to communicate with the interior of the cabinet 201. The movable electrode 30 is disposed in the second cavity 112 and includes a fixed ring 31 and a movable piece 32. The fixed ring 31 is fixed to the housing 10, and the movable piece 32 is located in the fixed ring 10. The inner ring of the fixed ring 31 is spaced apart from the fixed electrode 20, and the outer peripheral wall of the movable piece 32 is spaced apart from the inner ring of the fixed ring 31 in the radial direction of the fixed ring 31. At least one connection point 33 is provided between the fixed ring 31 and the movable piece 32, connecting the fixed ring 31 and the movable piece 32. The movable piece 32 can respond to the pressure change in the second cavity 112, and move relative to the fixed ring 31 towards the fixed electrode 20 with the connection point 33 as the moving point, thereby changing the distance between the movable piece 32 and the fixed electrode 20. Thus, by providing the movable electrode 30 including the fixed ring 31 and the movable piece 32, when the air pressure inside the refrigerator 200 changes, airflow is generated due to the pressure difference between the inside and outside of the refrigerator 200. The movable piece 32 changes position in response to the airflow, and the capacitance value can be changed by the amount of position change of the movable piece 32. Therefore, the threshold of the capacitor can be changed by changing the air flow rate without increasing the response sensitivity when the test capacitor changes. This avoids interference from factors such as electromagnetic interference and assembly deviation when measuring capacitor changes, thereby improving the stability and reliability of the refrigerator pressure switch 100 in controlling the door opening.

[0046] In one embodiment, such as Figures 4 to 7 As shown, the housing 10 includes an upper housing 13 and a lower housing 14. The upper housing 13 is used to install onto the cabinet 201. The upper housing 13 and the lower housing 14 are detachably connected and form a chamber 11. Thus, by setting a split and detachable housing 10 structure, the internal components are easier to install, debug, and maintain when using the refrigerator pressure switch 100, thereby improving production and maintenance efficiency.

[0047] like Figure 5 As shown, a through mounting cavity 12 is provided on the side wall of the housing 10. An extension piece 311 is provided on the upper part of the fixing ring 31, extending into the mounting cavity 12 for electrical connection to external devices. Here, the external device can be a controller that controls the opening of the refrigerator door. The controller can be any component capable of controlling the refrigerator door, such as a control chip or microcontroller; this embodiment does not impose any specific limitations.

[0048] like Figure 4As shown, the fixed electrode 20 can be a metal sheet such as a copper sheet, aluminum sheet, or stainless steel sheet. The fixed electrode 20 and the movable electrode 30 form a capacitor structure, and the fixed electrode 20 and the movable electrode 30 can be connected to a circuit to collect signals, thereby outputting the signal. Here, the fixed electrode 20 can be integrated with the circuit to facilitate the reception and transmission of capacitance signals.

[0049] In this embodiment, a PCB circuit board is integrated on the fixed electrode 20. By integrating the fixed electrode 20 with the PCB circuit board, no additional circuitry is required, thus reducing assembly costs. The PCB circuit board collects capacitance signals and transmits them to the refrigerator's controller, which then uses these capacitance signals to control the refrigerator's opening and closing.

[0050] Furthermore, a through hole 21 is provided on the fixed electrode 20, through which the first cavity 111 communicates with the outside. Not limited to this, in other embodiments, a through hole can also be provided on the housing 10 to connect the first cavity 111 to the outside. By providing the through hole 21, airflow can flow out to the outside, facilitating gas circulation.

[0051] like Figure 8 As shown, the number of connection points 33 is set to one. The movable piece 32 can respond to pressure changes within the second cavity 112 and rotate relative to the fixed ring 31 with the connection point 33 as the rotation center. Thus, by setting a single connection point 33, when airflow is generated in the refrigerator 200 due to the pressure difference between the inside and outside, the movable piece 32 can deflect relative to the fixed ring 31. Furthermore, because there is only one connection point 33, the movable piece 32 can produce a larger offset when the airflow blows, making it more sensitive to changes in the internal and external pressure difference and effectively improving the threshold of capacitance change. It should be explained that when the movable piece 32 rotates with the connection point 33 as the center, the uneven change in distance between it and the fixed electrode 20 may lead to uneven capacitance changes. Therefore, the capacitance change may not accurately reflect the actual magnitude of the internal air pressure and external pressure difference of the refrigerator 200. Therefore, this situation needs to be considered during use, and the preset capacitance value needs to be adjusted appropriately to meet usage requirements.

[0052] In one embodiment, the number of connection points 33 can be set to multiple, and the multiple connection points 33 are arranged circumferentially around the fixed ring 31. The connection points 33 are arranged in an arc shape, and the movable piece 32 can respond to pressure changes within the second cavity 112, rising or falling relative to the fixed ring 31 along the axis of the second cavity 112. With the multiple arc-shaped connection points 33, when air pressure changes inside and outside the refrigerator 200 generate airflow, the movable piece 32 is easily displaced by the airflow, which can increase the threshold of capacitance change. Simultaneously, when the movable piece 32 is displaced, the distance between each region and the fixed electrode 20 is the same, therefore the linear correspondence between the capacitance value change and the air pressure is strong, and the control accuracy of the refrigerator pressure switch 100 is high. Furthermore, the arrangement of multiple connection points 33 also makes the relative movement between the movable piece 32 and the fixed ring 31 more stable.

[0053] Here, the number of connection points 33 can be set to 2-10, such as 2, 3, 4, 5, etc.

[0054] like Figure 4 , Figure 5 and Figure 7 As shown, the refrigerator pressure switch 100 also includes a first sealing ring 40, which is disposed in the second cavity 112 and enables a sealed connection between the cavity wall of the second cavity 112 and the fixing ring 31. By setting the first sealing ring 40, the fixing ring 31 can be effectively fixed, preventing the refrigerator pressure switch 100 from having poor stability due to the offset of the fixing ring 31.

[0055] Specifically, the first sealing ring 40 can be a rubber ring or a silicone ring, etc.

[0056] In one embodiment, the refrigerator pressure switch 100 further includes an annular gasket 50 and a compression post 60. The annular gasket 50 is disposed between the fixed ring 31 and the fixed electrode 20, and the compression post 60 is disposed within the first cavity 111 and can apply a compression force to the fixed electrode 20 along the axis of the cavity 11 and toward the fixed ring 31. Thus, by providing the annular gasket 50 and the compression post 60, on the one hand, the fixed ring 31 and the fixed electrode 20 are fixed using the annular gasket 50 and the compression post 60, making the overall structure more stable; on the other hand, by providing the annular gasket 50 between the fixed ring 31 and the fixed electrode 20, the annular gasket 50 can separate the fixed electrode 20 and the movable electrode 30, allowing the movable piece 32 of the movable electrode 30 to move relative to the fixed electrode 20.

[0057] Optionally, the number of extrusion columns 60 can be set to multiple, ranging from 2 to 10, such as 2, 4, 6, etc.

[0058] In one embodiment, the extrusion column 60 is mounted on the upper shell 13.

[0059] In this embodiment, a plurality of extrusion columns 60 are spaced apart along the circumference of the upper shell 13. In this way, pressure can be applied to the fixed electrode 20 from all directions, improving the stability of the fixed electrode 20.

[0060] Furthermore, the extrusion column 60 is integrally formed with the upper shell 13. This reduces the number of parts, simplifies the assembly process, and improves the overall structural reliability.

[0061] This application also provides the following technical solutions:

[0062] A refrigerator 200 includes a cabinet 201, a door, and a refrigerator pressure switch 100 as described in any of the above embodiments. The door is mounted on the cabinet 201 and can move relative to the cabinet 201 in response to external force to change the internal air pressure of the cabinet 201. The refrigerator pressure switch 100 is mounted on the cabinet 201 and is used to control the opening of the refrigerator 200 door in response to the airflow generated by the change in internal air pressure.

[0063] like Figures 1 to 4 As shown, the refrigerator 200 also includes a first embedded box 210, a second embedded box 220, and a connecting pipe 230. The first embedded box 210 is installed on the cabinet 201 and is provided with a first pipe interface 211. The second embedded box 220 is installed inside the cabinet 201 and is provided with a second pipe interface 221. One end of the connecting pipe 230 is connected to the first pipe interface 211, and the other end is connected to the second pipe interface 221. The shell 10 is provided with a plug pipe 15 that communicates with the second cavity 112. The plug pipe 15 is inserted into the first pipe interface 211 and communicates with the connecting pipe 230.

[0064] Here, since the inside of the refrigerator 200 is connected to the outside, in order to prevent the water vapor inside the refrigerator 200 from flowing into the refrigerator pressure switch 100 with the airflow and affecting the fixed electrode 20 or the movable electrode 30, causing the refrigerator pressure switch 100 to malfunction, a heating tube or dryer can be installed in the first embedded box 210 or the second embedded box 220 to dry the gas flowing to the refrigerator pressure switch 100.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A refrigerator pressure switch, disposed on the body (201) of a refrigerator (200), which is capable of controlling the opening of the refrigerator (200) door in response to airflow generated by changes in internal air pressure; characterized in that, The refrigerator pressure switch (100) includes: The housing (10) has a cavity (11) and is used for mounting to the enclosure (201). A fixed electrode (20) is fixedly installed inside the housing (10) and divides the chamber (11) into a first chamber (111) and a second chamber (112), the second chamber (112) being used to communicate with the interior of the box (201); An active electrode (30) is disposed in the second cavity (112) and includes a fixed ring (31) and a movable piece (32). The fixed ring (31) is fixed to the housing (10). The movable piece (32) is located in the inner ring of the fixed ring (31) and is spaced apart from the fixed electrode (20). In the radial direction of the fixed ring (31), the outer peripheral wall of the movable piece (32) is spaced apart from the inner ring of the fixed ring (31). At least one connection point (33) is provided between the fixed ring (31) and the movable piece (32) to connect the fixed ring (31) and the movable piece (32); The movable piece (32) is able to respond to the pressure change in the second cavity (112) and move relative to the fixed ring (31) toward the fixed electrode (20) with the connection point (33) as the movable point, thereby changing the distance between the movable piece (32) and the fixed electrode (20).

2. The refrigerator pressure switch according to claim 1, characterized in that, The number of connection points (33) is set to one, and the movable piece (32) can respond to the pressure change in the second cavity (112) and rotate relative to the fixed ring (31) with the connection point (33) as the rotation center.

3. The refrigerator pressure switch according to claim 1, characterized in that, The number of connection points (33) is set to multiple, and the multiple connection points (33) are arranged at circumferential intervals in the fixed ring (31); The connection point (33) is arranged in an arc shape, and the movable piece (32) can respond to the pressure change in the second cavity (112) and rise or fall relative to the fixed ring (31) in the axial direction of the second cavity (112).

4. The refrigerator pressure switch according to claim 1, characterized in that, The side wall of the housing (10) has a through mounting cavity (12), and an extension piece (311) is provided on the fixing ring (31). The extension piece (311) extends to the mounting cavity (12) for electrical connection of external devices.

5. The refrigerator pressure switch according to claim 1, characterized in that, The refrigerator pressure switch (100) also includes a first sealing ring (40), which is disposed in the second cavity (112) and enables the cavity wall of the second cavity (112) to be sealed to the fixed ring (31).

6. The refrigerator pressure switch according to claim 5, characterized in that, The refrigerator pressure switch (100) also includes an annular gasket (50) and a compression post (60). The annular gasket (50) is disposed between the fixed ring (31) and the fixed electrode (20). The compression post (60) is disposed in the first cavity (111) and can apply a compression force to the fixed electrode (20) along the axis of the cavity (11) and toward the fixed ring (31).

7. The refrigerator pressure switch according to claim 6, characterized in that, The housing (10) includes an upper shell (13) and a lower shell (14). The upper shell (13) is used to be installed on the box (201). The upper shell (13) and the lower shell (14) are detachably connected and form the chamber (11). The extrusion column (60) is installed on the upper shell (13).

8. The refrigerator pressure switch according to claim 7, characterized in that, The extrusion column (60) is integrally formed with the upper shell (13).

9. A refrigerator, characterized in that, The refrigerator includes a housing (201), a door, and a refrigerator pressure switch (100) as described in any one of claims 1-8. The door is mounted on the housing (201) and can move relative to the housing (201) in response to an external force to change the internal air pressure of the housing (201). The refrigerator pressure switch (100) is mounted on the housing (201) and is used to control the opening of the refrigerator (200) door in response to the airflow generated by the change in internal air pressure.

10. The refrigerator according to claim 9, characterized in that, The refrigerator (200) further includes a first embedded box (210), a second embedded box (220), and a connecting pipe (230). The first embedded box (210) is installed on the cabinet (201) and is provided with a first pipe interface (211). The second embedded box (220) is installed inside the cabinet (201) and is provided with a second pipe interface (221). One end of the connecting pipe (230) is connected to the first pipe interface (211), and the other end is connected to the second pipe interface (221). The housing (10) is provided with a plug tube (15) that communicates with the second cavity (112). The plug tube (15) is inserted into the first pipeline interface (211) and communicates with the connecting pipe (230).

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