Combined water valve for vehicle

Abstract

The invention relates to the technical field of vehicle water valve manufacturing, in particular to a vehicle combined water valve. Comprising a shell, a first valve cavity and a second valve cavity which are isolated from each other are formed in the shell, a connecting end is arranged on one side of the shell, a plurality of flow channel openings are formed in the connecting end, and the flow channel openings comprise a plurality of first flow channel openings and a plurality of second flow channel openings which are communicated with the first valve cavity and the second valve cavity respectively; the first valve element is rotationally arranged in the first valve cavity, a driving connection structure is arranged on the first valve element, and a first valve element flow channel is formed in the first valve element; the second valve element is rotationally arranged in the second valve cavity, and a second valve element flow channel is formed in the second valve element; in the rotating process of the first valve element, the transmission step abuts against the driving step to drive the second valve element to rotate, and a rotating neutral position is arranged between the driving step and the transmission step in the circumferential direction. The device has the advantage of high integration, can save installation space, and is convenient for pipeline connection.

Description

Technical Field

[0001] The invention relates to the technical field of combined water valve manufacturing, and in particular to a vehicle-used combined water valve. Background Art

[0002] With the gradual implementation of the national new energy strategy, the market penetration rate of new energy vehicles has increased by double digits year by year. The energy in traditional cars mainly comes from the residual heat energy after engine combustion, which can fully meet the needs of passengers in the cockpit. However, the energy of new energy vehicles mainly comes from batteries. How to make full use of energy and solve the problems of reduced mileage caused by cockpit comfort and battery power consumption is a major challenge in the design of thermal management systems for new energy vehicles. At present, the energy utilization rate of new energy vehicles is generally not high, and some energy is directly discharged into the atmosphere without waiting to be fully utilized.

[0003] The water valve is a key component of the thermal management system of new energy vehicles and a key component for controlling the flow of heat energy in the coolant. At present, in order to meet the switching of multiple flow channels, two sets of water valves are often required in the thermal management system, which leads to a high degree of complexity in the piping system and does not meet the requirements of the integration of lightweight and small volume of control components in new energy vehicle systems. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a vehicle-use combined water valve, which has the advantages of high integration, can save installation space, and is convenient for pipeline connection.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: A vehicle combined water valve, comprising: A housing, wherein a first valve cavity and a second valve cavity isolated from each other are provided in the housing, a connecting end portion is provided on one side of the housing, and a plurality of flow passages are provided on the connecting end portion, wherein the flow passages include a plurality of first flow passages and second flow passages respectively connected to the first valve cavity and the second valve cavity; A first valve core, the first valve core is rotatably disposed in the first valve cavity, a driving connection structure is provided on the first valve core, the driving connection structure is disposed outside the first valve cavity, a first valve core flow channel is provided in the first valve core, and the first valve core is rotated to switch the communication state between the first valve core flow channel and each first flow channel opening; A second valve core, the second valve core is rotatably disposed in the second valve cavity, a second valve core flow channel is disposed in the second valve core, and the second valve core is rotated to switch the communication state between the second valve core flow channel and each second flow channel opening; A driving step is provided on one side of the first valve core near the second valve core, and a transmission step corresponding to the driving step is provided on the second valve core. During the rotation of the first valve core, the transmission step conflicts with the driving step to drive the second valve core to rotate, and a rotation gap is provided between the driving step and the transmission step in the circumferential direction.

[0006] Furthermore, in the present application, a vehicle combined water valve, the housing includes a valve cover, a first valve housing, and a second valve housing connected in sequence axially, the first valve cavity is arranged between the valve cover and the first valve housing, the second valve cavity is arranged between the first valve housing and the second valve housing, the connecting end is arranged at an end of the second valve housing away from the first valve housing, the first valve housing is provided with an opening, the opening is used to pass through the transmission step and / or the driving step, and a first sealing ring is arranged between the opening and the second valve core. As a preferred embodiment of the present application, in this embodiment, the transmission step passes through the opening, a connecting column is arranged between the second valve core and the transmission step, and the connecting column is rotatably arranged in the opening.

[0007] Furthermore, in a vehicle combined water valve in the present application, a first pipeline cavity corresponding one-to-one to the first flow channel opening is provided on the second valve housing, a second pipeline cavity corresponding one-to-one to the first pipeline cavity is provided on the first valve housing, two ends of the second pipeline cavity are respectively connected to the first pipeline cavity and the first valve cavity, and a third sealing ring is provided between the second pipeline cavity and the first valve core.

[0008] Furthermore, in a vehicle-use combined water valve in the present application, the second pipe cavity is circumferentially arrayed on the outside of the first valve cavity, the second pipe cavity includes a longitudinal flow channel connected to the first pipe cavity and a transverse flow channel connected to the first valve cavity, and the opening of the first valve core flow channel on the first valve core corresponds to the transverse flow channel.

[0009] Furthermore, in the present application, a vehicle combined water valve has an opening at one end of the transverse flow channel near the valve cover, the valve cover includes a flow channel cover and a valve cavity cover, the flow channel cover is arranged on the first valve shell, the flow channel cover includes a cover body adapted to the open end of the transverse flow channel, the flow channel cover also includes a valve cavity wall which is circumferentially closed and axially open at both ends, the cover body is connected to the outside of the valve cavity wall, the first valve core is arranged on the inside of the valve cavity wall, the valve cavity cover is arranged on the end of the valve cavity wall away from the first valve shell, the valve cavity cover is provided with a through hole corresponding to the drive connection structure, and a second sealing ring is provided between the valve cavity cover and the drive connection structure. As a preferred embodiment of the present application, based on the above structure, the housing adopts a split component, which is easy to process and helps to reduce manufacturing costs.

[0010] Furthermore, in a vehicle combined water valve in the present application, the number of second pipe cavities is 4, which are evenly arranged in an array in the circumferential direction, the number of first valve core flow channels is 2, and the 4 ports corresponding to a pair of first valve core flow channels are evenly arranged circumferentially on the side of the first valve core.

[0011] Furthermore, in a vehicle combined water valve in the present application, the second valve core flow channel is arranged on the side of the second valve core near the connection end, and the opening of the second valve core flow channel faces the second flow channel port; a spring is arranged on the side of the second valve core away from the connection end, and the spring abuts between the second valve core and the first valve housing, and a sealing gasket is arranged on the side of the second valve cavity near the connection end. As a preferred solution of the present application, a spring is arranged to ensure that the second valve core is tightly fitted to the inner wall of the second valve cavity near the connection end.

[0012] Furthermore, in a vehicle combined water valve in the present application, a calibration step is provided on the side of the first valve housing near the second valve core, a limit step is provided on the second valve core corresponding to the calibration step, and a rotation gap is provided between the limit step and the calibration step in the circumferential direction; a circumferential positioning structure is provided on the drive connection structure, and the circumferential positioning structure is used to cooperate with the driver input shaft to determine the circumferential posture of the first valve core relative to the driver input shaft. As a preferred embodiment of the present application, when used for the first time, the second valve core is driven to rotate until the limit step conflicts with the calibration step, thereby determining the circumferential position of the second valve core. The provision of the circumferential positioning structure can determine the relative position of the drive connection structure and the driver input shaft, so there is no need to calibrate the posture of the first valve core, which has the advantage of simple control.

[0013] Furthermore, in a vehicle combined water valve in the present application, a pressure balancing chamber is provided between the second valve core and the first valve housing, and a through hole connected to the pressure balancing chamber is provided on a flow channel of the second valve core. As a preferred embodiment of the present application, the pressure balancing chamber is provided to balance the longitudinal water pressure received by the second valve core.

[0014] Furthermore, in the vehicle combined water valve of the present application, the number of second flow passages is 5, including a central flow passage and 4 outer flow passages arrayed circumferentially outside the central flow passage; the number of second valve core flow passages is 2, including flow passage A connecting the central flow passage and one outer flow passage, and flow passage B connecting a pair of outer flow passages. As a preferred solution of the present application, the second valve core thus realizes 5-way switching.

[0015] It can be seen from the above technical solution that the present invention has the following beneficial effects: The present invention provides a vehicle combined water valve, and the method of use is: when installing, the external pipeline can be integrated and connected to one side of the connection end, and connected to each flow channel one by one, so as to save installation space, and it has the advantage of convenient connection of pipelines. When working, the driver is connected to the driving connection structure, and the first valve core is driven to rotate by the input torque. When switching the flow channel, the first valve core is first rotated in one direction to drive the second valve core to a preset position to complete the flow channel switching of the second flow channel port and the second valve core flow channel, and then the first valve core is rotated in the opposite direction to the preset position to complete the flow channel switching of the first flow channel port and the first valve core flow channel. In this process, the driving step rotates in the rotation neutral position without affecting the position of the second valve core. It can realize that one driver controls the rotation of two valve cores, which can further save space and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic plan view of the connection end side of a vehicle combined water valve in an embodiment of the present application; Figure 2 for Figure 1 Sectional view in the AA direction; Figure 3 An exploded view of the components of a vehicle combined water valve in an embodiment of the present application; Figure 4 This is a schematic diagram of the connection between the first valve core and the second valve core in the embodiment of the present application; Figure 5 It is a schematic diagram of the connection between the driving step and the transmission step in the embodiment of the present application; Figure 6 This is a schematic diagram of the connection between the second valve core and the second valve housing in the embodiment of the present application; Figure 7 A schematic diagram of a first valve housing in an embodiment of the present application; Figure 8 It is a schematic plan view of the flow channel side corresponding to the second valve core in the embodiment of the present application; Fig. 9 A schematic diagram of the flow channel connection of a vehicle combined water valve corresponding to the first valve core flow channel in an embodiment of the present application; Fig.10 This is a schematic diagram of the flow channel connection corresponding to the second valve core flow channel of a vehicle combined water valve in an embodiment of the present application.

[0017] In the figure: 1-housing; 101-first valve cavity; 102-second valve cavity; 11-connecting end; 111-first flow channel opening; 112-second flow channel opening; 1121-central flow channel opening; 1122-outer flow channel opening; 12-first valve housing; 120-opening; 121-second pipeline cavity; 1211-longitudinal flow channel; 1212-transverse flow channel; 122-calibration step; 123-pressure balance cavity; 13-second valve housing; 131-first pipeline cavity; 14-valve cover; 141-flow channel cover; 1411-cover body; 1412-valve cavity wall; 142-valve cavity cover; 2-first valve core; 20-first valve core flow channel; 21-driving step; 22-driving connection structure; 221-circumferential positioning structure; 3-second valve core; 30-second valve core flow channel; 301-flow channel A; 302-flow channel B; 303-perforation; 31-transmission step; 32-limiting step; 4- Spring; 61 - first sealing ring; 62 - second sealing ring; 63 - third sealing ring; 64 - sealing gasket. DETAILED DESCRIPTION

[0018] Combination Figures 1 to 5 A vehicle combined water valve is shown, comprising: A housing 1, wherein a first valve cavity 101 and a second valve cavity 102 isolated from each other are provided in the housing 1, a connecting end 11 is provided on one side of the housing 1, and a plurality of flow passages are provided on the connecting end 11, and the flow passages include a plurality of first flow passages 111 and a second flow passage 112 respectively connected to the first valve cavity 101 and the second valve cavity 102; A first valve core 2, the first valve core 2 is rotatably disposed in the first valve cavity 101, a driving connection structure 22 is provided on the first valve core 2, the driving connection structure 22 is disposed outside the first valve cavity 101, a first valve core flow channel 20 is provided in the first valve core 2, and the first valve core 2 is rotated to switch the communication state between the first valve core flow channel 20 and each first flow channel opening 111; The second valve core 3 is rotatably disposed in the second valve cavity 102, and a second valve core flow channel 30 is disposed in the second valve core 3. The second valve core 3 is rotated to switch the communication state between the second valve core flow channel 30 and each second flow channel opening 112; A driving step 21 is provided on the side of the first valve core 2 near the second valve core 3, and a transmission step 31 corresponding to the driving step 21 is provided on the second valve core 3. During the rotation of the first valve core 2, the transmission step 31 conflicts with the driving step 21 to drive the second valve core 3 to rotate, and a rotation gap is provided between the driving step 21 and the transmission step 31 in the circumferential direction.

[0019] Based on the above structure, a method of using a vehicle combined water valve is: when installing, the external pipeline can be integrated and connected to one side of the connection end 11, and connected to each flow channel one by one, so as to save installation space and have the advantage of convenient connection of pipelines. When working, the driver is connected to the driving connection structure 22, and the first valve core 2 is driven to rotate by the input torque. When switching the flow channel, the first valve core 2 is first rotated in one direction to drive the second valve core 3 to a preset position to complete the flow channel switching of the second flow channel port 112 and the second valve core flow channel 30, and then the first valve core 2 is rotated in the opposite direction to the preset position to complete the flow channel switching of the first flow channel port 111 and the first valve core flow channel 20. In this process, the driving step 21 rotates in the rotation neutral position without affecting the position of the second valve core 3.

[0020] Combination Figure 2 and Figure 3 In the embodiment shown, the housing 1 includes a valve cover 14, a first valve housing 12, and a second valve housing 13 connected in sequence axially, a first valve cavity 101 is arranged between the valve cover 14 and the first valve housing 12, a second valve cavity 102 is arranged between the first valve housing 12 and the second valve housing 13, a connecting end 11 is arranged at an end of the second valve housing 13 away from the first valve housing 12, an opening 120 is arranged on the first valve housing 12, the opening 120 is used to pass through the transmission step 31 and / or the driving step 21, and a first sealing ring 61 is arranged between the opening 120 and the second valve core 3. In this embodiment, the transmission step 31 passes through the opening 120, a connecting column is arranged between the second valve core 3 and the transmission step 31, and the connecting column is rotatably arranged in the opening 120.

[0021] In this embodiment, the second valve housing 13 is provided with a first pipeline cavity 131 corresponding to the first flow channel opening 111, and the first valve housing 12 is provided with a second pipeline cavity 121 corresponding to the first pipeline cavity 131. The two ends of the second pipeline cavity 121 are respectively connected to the first pipeline cavity 131 and the first valve cavity 101, and a third sealing ring 63 is provided between the second pipeline cavity 121 and the first valve core 2. In addition, the second pipeline cavity 121 is circumferentially arrayed on the outside of the first valve cavity 101, and the second pipeline cavity 121 includes a longitudinal flow channel 1211 connected to the first pipeline cavity 131 and a transverse flow channel 1212 connected to the first valve cavity 101. The opening of the first valve core flow channel 20 on the first valve core 2 corresponds to the transverse flow channel 1212. Figure 2 and Figure 3In the embodiment shown, the transverse flow channel 1212 is open near one end of the valve cover 14, the valve cover 14 includes a flow channel cover 141 and a valve cavity cover 142, the flow channel cover 141 is covered on the first valve housing 12, the flow channel cover 141 includes a cover body 1411 adapted to the open end of the transverse flow channel 1212, the flow channel cover 141 also includes a valve cavity wall 1412 which is closed in the circumference and open at both ends in the axial direction, the cover body 1411 is connected to the outside of the valve cavity wall 1412, the first valve core 2 is arranged on the inside of the valve cavity wall 1412, the valve cavity cover 142 is covered at one end of the valve cavity wall 1412 away from the first valve housing 12, the valve cavity cover 142 is provided with a through hole corresponding to the drive connection structure 22, and a second sealing ring 62 is provided between the valve cavity cover 142 and the drive connection structure 22. Based on the above structure, the housing 1 adopts a split part, which is easy to process and helps to reduce the manufacturing cost.

[0022] Combination Fig. 9 As shown, in this embodiment, the number of second pipe cavities 121 is 4 and they are evenly arrayed in the circumferential direction, the number of first valve core flow channels 20 is 2, and the 4 ports corresponding to a pair of first valve core flow channels 20 are evenly arranged on the side of the first valve core 2 in the circumferential direction.

[0023] Combination Figure 2 and Figure 3 In the embodiment shown, the second valve core flow channel 30 is arranged on the side of the second valve core 3 near the connection end 11, and the opening of the second valve core flow channel 30 faces the second flow channel port 112; a spring 4 is arranged on the side of the second valve core 3 away from the connection end 11, and the spring 4 abuts between the second valve core 3 and the first valve housing 12, and a sealing gasket 64 is arranged on the side of the second valve cavity 102 near the connection end 11. The spring 4 is arranged to ensure that the second valve core 3 is closely attached to the inner wall of the second valve cavity 102 near the connection end 11. Specifically, the spring 4 is a wave spring.

[0024] Combination Figure 6 and 7 As shown, in this embodiment, a calibration step 122 is provided on the side of the first valve housing 12 near the second valve core 3, and a limiting step 32 is provided on the second valve core 3 corresponding to the calibration step 122, and a rotation gap is provided between the limiting step 32 and the calibration step 122 in the circumferential direction. Figure 4As shown, the drive connection structure 22 is provided with a circumferential positioning structure 221, and the circumferential positioning structure 221 is used to cooperate with the driver input shaft to adjust the circumferential posture of the first valve core 2 relative to the driver input shaft. When used for the first time, the second valve core 3 is driven to rotate until the limit step 32 conflicts with the calibration step 122, thereby determining the circumferential position of the second valve core 3. The provision of the circumferential positioning structure 221 can determine the relative position of the drive connection structure 22 and the driver input shaft, so there is no need to calibrate the posture of the first valve core 2, which has the advantage of simple control. In this embodiment, the drive connection structure 22 is a column that extends circumferentially out of the valve chamber cover 142, and the circumferential positioning structure 221 is a missing groove. In other embodiments, the circumferential positioning structure 221 can be a convex portion.

[0025] Combination Figure 2 and Figure 8 As shown, in this embodiment, a pressure balance chamber 123 is provided between the second valve core 3 and the first valve housing 12, and a through hole 303 connected to the pressure balance chamber 123 is provided on one of the second valve core flow channels 30. The pressure balance chamber 123 is provided to balance the longitudinal water pressure received by the second valve core 3.

[0026] Combination Figure 1 , Figure 8 and Fig.10 As shown, in this embodiment, the number of second flow channel openings 112 is 5, including a central flow channel opening 1121 and four outer flow channel openings 1122 arranged in a circumferential array outside the central flow channel opening 1121; the number of second valve core flow channels 30 is 2, including flow channel A 301 connecting the central flow channel opening 1121 and one outer flow channel opening 1122 and flow channel B 302 connecting a pair of outer flow channel openings 1122. Therefore, the second valve core 3 realizes 5-way switching. In this embodiment, the perforation 303 is set on the flow channel A 301.

[0027] The technical principles of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without creative work, and these methods will fall within the scope of protection of the present invention.

[0028] Without departing from the concept of the present invention, several modifications and improvements may be made, such as combining different features in various embodiments, etc., all of which fall within the protection scope of the present invention.

Claims

1. A vehicle combined water valve, characterized in that: include: A housing (1), wherein a first valve cavity (101) and a second valve cavity (102) isolated from each other are provided in the housing (1), a connecting end portion (11) is provided on one side of the housing (1), a plurality of flow passages are provided on the connecting end portion (11), the flow passages comprising a plurality of first flow passages (111) and second flow passages (112) respectively communicating with the first valve cavity (101) and the second valve cavity (102); a first valve core (2), the first valve core (2) being rotatably disposed in the first valve cavity (101), the first valve core (2) being provided with a driving connection structure (22), the first valve core (2) being provided with a first valve core flow channel (20), the first valve core (2) being rotated to switch the communication state between the first valve core flow channel (20) and each first flow channel opening (111); A second valve core (3), the second valve core (3) being rotatably disposed in the second valve cavity (102), a second valve core flow channel (30) being disposed in the second valve core (3), and the second valve core (3) being rotated to switch the communication state between the second valve core flow channel (30) and each second flow channel opening (112); A driving step (21) is provided on one side of the first valve core (2) close to the second valve core (3), and a transmission step (31) corresponding to the driving step (21) is provided on the second valve core (3). During the rotation of the first valve core (2), the transmission step (31) abuts against the driving step (21) to drive the second valve core (3) to rotate, and a rotation gap is provided between the driving step (21) and the transmission step (31) in the circumferential direction.

2. A vehicle combined water valve according to claim 1, characterized in that: The housing (1) comprises a valve cover (14), a first valve housing (12) and a second valve housing (13) which are axially connected in sequence, the first valve chamber (101) being arranged between the valve cover (14) and the first valve housing (12), the second valve chamber (102) being arranged between the first valve housing (12) and the second valve housing (13), the connecting end portion (11) being arranged at an end of the second valve housing (13) away from the first valve housing (12), the first valve housing (12) being provided with an opening (120), the opening (120) being used to pass through a transmission step (31) and / or a drive step (21), and a first sealing ring (61) being arranged between the opening (120) and the second valve core (3).

3. A vehicle combined water valve according to claim 2, characterized in that: The second valve housing (13) is provided with a first pipeline cavity (131) corresponding one-to-one to the first flow channel opening (111), and the first valve housing (12) is provided with a second pipeline cavity (121) corresponding one-to-one to the first pipeline cavity (131), and the two ends of the second pipeline cavity (121) are respectively connected to the first pipeline cavity (131) and the first valve cavity (101), and a third sealing ring (63) is provided between the second pipeline cavity (121) and the first valve core (2).

4. A vehicle combined water valve according to claim 3, characterized in that: The second pipeline cavity (121) is arranged in a circumferential array on the outside of the first valve cavity (101), and the second pipeline cavity (121) includes a longitudinal flow channel (1211) connected to the first pipeline cavity (131) and a transverse flow channel (1212) connected to the first valve cavity (101), and the opening of the first valve core flow channel (20) on the first valve core (2) corresponds to the transverse flow channel (1212).

5. A vehicle combined water valve according to claim 4, characterized in that: The transverse flow channel (1212) is open at one end near the valve cover (14); the valve cover (14) comprises a flow channel cover (141) and a valve cavity cover (142); the flow channel cover (141) is disposed on the first valve housing (12); the flow channel cover (141) comprises a cover body (1411) adapted to the open end of the transverse flow channel (1212); the flow channel cover (141) further comprises a valve cavity wall (1412) which is closed in the circumferential direction and open at both ends in the axial direction; The cover body (1411) is connected to the outside of the valve chamber wall (1412), the first valve core (2) is arranged on the inside of the valve chamber wall (1412), the valve chamber cover (142) is arranged on the end of the valve chamber wall (1412) away from the first valve shell (12), the valve chamber cover (142) is provided with a through hole corresponding to the drive connection structure (22), and a second sealing ring (62) is provided between the valve chamber cover (142) and the drive connection structure (22).

6. A vehicle combined water valve according to claim 5, characterized in that: The number of the second pipeline cavities (121) is 4 and they are evenly arranged in an array in the circumferential direction; the number of the first valve core flow channels (20) is 2, and the four ports corresponding to a pair of first valve core flow channels (20) are evenly arranged on the side of the first valve core (2) in the circumferential direction.

7. The vehicle combined water valve according to claim 1, characterized in that: The second valve core flow channel (30) is arranged on a side of the second valve core (3) close to the connecting end (11), and the opening of the second valve core flow channel (30) faces the second flow channel opening (112); a spring (4) is provided on a side of the second valve core (3) away from the connecting end (11), and the spring (4) is in contact between the second valve core (3) and the first valve housing (12); and a sealing gasket (64) is provided on a side of the second valve chamber (102) close to the connecting end (11).

8. The vehicle combined water valve according to claim 1, characterized in that: A calibration step (122) is provided on one side of the first valve housing (12) close to the second valve core (3); a limit step (32) is provided on the second valve core (3) corresponding to the calibration step (122); and a rotation gap is provided between the limit step (32) and the calibration step (122) in the circumferential direction; The drive connection structure (22) is provided with a circumferential positioning structure (221), and the circumferential positioning structure (221) is used to cooperate with the driver input shaft to determine the circumferential posture of the circumferential first valve core (2) relative to the driver input shaft.

9. The vehicle combined water valve according to claim 7, characterized in that: A pressure balancing chamber (123) is provided between the second valve core (3) and the first valve housing (12), wherein a through hole (303) communicating with the pressure balancing chamber (123) is provided on one of the second valve core flow channels (30).

10. The vehicle combined water valve according to claim 7, characterized in that: The number of the second flow channel openings (112) is 5, including a central flow channel opening (1121) and 4 outer flow channel openings (1122) arranged in a circumferential array outside the central flow channel opening (1121); The number of the second valve core flow channels (30) is 2, including a flow channel A (301) connecting the central flow channel opening (1121) and an outer flow channel opening (1122), and a flow channel B (302) connecting a pair of outer flow channel openings (1122).

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