Integrated pump

Abstract

The utility model provides an integrated pump which comprises a diaphragm pump assembly, a peristaltic pump assembly, a motor and a transmission part. The diaphragm pump assembly comprises a diaphragm pump driving part and a diaphragm pump functional part, and the peristaltic pump assembly comprises a peristaltic pump driving part and a peristaltic pump functional part. The motor drives the diaphragm pump driving part and the peristaltic pump driving part through the transmission part, and the diaphragm pump driving part and the peristaltic pump driving part respectively drive the diaphragm pump functional part and the peristaltic pump functional part to perform pumping action. The pump is an integrated pump, has the functions of a diaphragm pump and a peristaltic pump at the same time, is driven by the same motor, is simple in structure, low in cost, small in overall size and small in occupied installation space, in addition, the two pumps are driven by the same motor, and can work together in a fixed coordination rhythm all the time from the hardware structure, so that the cost is reduced, and the working efficiency is improved. The fixed output proportion is always kept, the proportion is not prone to being damaged, stability is high, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pump products, in particular to an integrated pump. Background Art

[0002] Diaphragm pumps and peristaltic pumps are two pumps with different operating principles. Diaphragm pumps have the advantage of large delivery volume, but their delivery force is relatively small. They are generally suitable for the delivery of water or gas. Although peristaltic pumps have a small delivery volume, they have a large delivery force and can be used for thicker or more viscous liquids, such as cleaning fluids, disinfectants, glues, etc. In most cases, only one type of pump is needed. However, in some cases, two pumps are still needed to work simultaneously or collaboratively. The most common example is the disinfectant water function or foam water seal function of an electric toilet, which requires the disinfectant / disinfectant and water to be output and mixed at the same time to form diluted disinfectant / foam water. For this reason, this type of application requires the installation of a diaphragm pump and a peristaltic pump at the same time. On the one hand, the simultaneous installation of the two pumps requires a larger installation space to be reserved. On the other hand, the two pumps require two motors, which increases the cost of accessories. Furthermore, although the two pumps work together, they may also be installed close to each other, but they still work independently. The overall coordination needs to be achieved through an electronic control system, which increases the difficulty of developing the electronic control system. In addition, the different usage of the motors of the two pumps may result in different motor aging speeds, which in turn causes the problem of hardware aging and poor coordination that is difficult to solve in software. For this reason, the utility model provides an integrated pump that can solve the above technical problems. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes an integrated pump structure having both a diaphragm pump and a peristaltic pump.

[0004] An integrated pump comprises a diaphragm pump assembly, a peristaltic pump assembly, a motor and a transmission member.

[0005] The diaphragm pump assembly includes a diaphragm pump driver and a diaphragm pump functional component, and the peristaltic pump assembly includes a peristaltic pump driver and a peristaltic pump functional component. The motor drives the diaphragm pump driver and the peristaltic pump driver through a transmission component, and the diaphragm pump driver drives the diaphragm pump functional component to perform a pumping action, and the peristaltic pump driver drives the peristaltic pump functional component to perform a pumping action, thereby achieving synchronous operation of the two pump assemblies driven by a single motor.

[0006] The pump provided by the utility model is an integrated pump, which combines a diaphragm pump and a peristaltic pump, and is driven synchronously by the same motor. On the one hand, it has the functions of a diaphragm pump and a peristaltic pump, with a streamlined structure and low cost. The overall size is also smaller than the sum of the sizes of the two traditional pumps, and the installation space it occupies is small. On the other hand, the two pumps are driven by the same motor. From the hardware structure, it can be achieved that they always work together in a fixed coordinated rhythm and always maintain a fixed output ratio. The ratio is not easily destroyed, and it has high stability and strong reliability.

[0007] Preferably, the transmission member directly connects to and drives the diaphragm pump driver and the peristaltic pump driver, or the transmission member directly connects to and drives one of the diaphragm pump driver and the peristaltic pump driver, and then connects to and drives the other through the driven driver. It can be seen that the installation method between the transmission member and the diaphragm pump driver and the peristaltic pump driver can be flexibly selected according to actual needs.

[0008] Preferably, the transmission member adopts a combination of one or two of the gear and gear, synchronous wheel and synchronous belt, or belt and pulley linkage structures, and the driving structure is flexible and can be selected according to actual needs.

[0009] Preferably, the transmission member includes a motor gear and a linkage gear. The motor gear is mounted on the rotating shaft of the motor and meshes with the rotatably mounted linkage gear, and the drive gear drives the diaphragm pump drive member and the peristaltic pump drive member respectively.

[0010] Preferably, the transmission member also includes a driving gear, which is sleeved on the input shaft of the diaphragm pump driver and / or the peristaltic pump driver and meshes with the linkage gear to form a stable power transmission trajectory, and is also convenient for designing the required deceleration or speed-up ratio requirements.

[0011] Preferably, there are at least two groups of diaphragm pump assemblies, and all are distributed around the linkage gear through a driving gear, and can transport different media respectively. For example, when there are two groups of diaphragm pump assemblies, water and air can be transported at the same time to provide water and bubbling air for the foam water seal.

[0012] Preferably, the diaphragm pump assembly and the motor are arranged at the same end of the motor gear, thereby making the overall structure of the integrated pump more compact.

[0013] Preferably, the input shaft of the peristaltic pump driver is coaxial with the linkage gear and is integrally formed or assembled together, so that the linkage gear directly drives the peristaltic pump driver without the need for additional connectors, thereby further streamlining the structure.

[0014] Preferably, there are at least two groups of peristaltic pump drive components, which are connected in series on the same input shaft, so that different media can be pumped simultaneously through different peristaltic pumps. For example, when there are two groups of peristaltic pump components, cleaning liquid and disinfectant can be delivered at the same time, or foaming liquid and disinfectant can be delivered at the same time.

[0015] Preferably, the diaphragm pump drive comprises an eccentric wheel and a swing frame, and the diaphragm pump functional part comprises a diaphragm and a diaphragm valve. The eccentric wheel is driven to rotate by the input shaft of the diaphragm pump drive, and the eccentric wheel drives the diaphragm to expand and contract through the swing frame, and the diaphragm sucks and discharges the medium to be transported through the diaphragm valve. The peristaltic pump drive comprises a runner and an extrusion wheel, and the peristaltic pump functional part comprises a pumping tube. The runner is driven to rotate by the input shaft of the peristaltic pump drive, and is provided with a coaxial annular groove. The at least one extrusion wheel is eccentrically mounted in the annular groove, and the pumping tube is U-shaped and wound around the annular groove and the outer periphery of the extrusion wheel. The extrusion wheel is driven to rotate by the runner, and drives the pumping tube to suck and discharge the medium to be transported by pushing.

[0016] Preferably, the peristaltic pump functional part further includes a peristaltic valve. In order to enable the same peristaltic pump functional part to transport different media, the peristaltic valve is provided with a first docking channel, a second docking channel, a first external channel, a second external channel, a third external channel and a fourth external channel. Wherein, the first docking channel and the second docking channel are respectively connected to the two ends of the pumping tube of the peristaltic pump functional part, and the first external channel and the second external channel are one-way channels in opposite directions, and one end is connected to the first docking channel, the third external channel and the fourth external channel are one-way channels in opposite directions, and one end is connected to the second docking channel. The first external channel and the fourth external channel are both feed channels, the second external channel and the third external channel are both discharge channels, the first external channel and the third external channel are used in conjunction with each other, and the fourth external channel and the second external channel are used in conjunction with each other. When the motor rotates forward, the first external channel sucks material, and the third external channel discharges material. When the motor rotates reversely, the fourth external channel sucks material, and the second external channel discharges material. It should be noted that no matter whether the motor rotates forward or reversely, the feed end and the discharge end of the diaphragm pump functional part remain unchanged. Therefore, when in use, the medium sucked by the diaphragm pump functional part and the first medium sucked by the peristaltic pump functional part can be used in combination through the forward rotation of the motor. After that, the medium sucked by the diaphragm pump functional part and the second medium sucked by the peristaltic pump functional part can be used in combination through the reverse rotation of the motor. For example, when the toilet is flushed, water and cleaning liquid are mixed first to form cleaning water for flushing the toilet, followed by a mixture of water and foaming liquid to form a foam water seal for the toilet.

[0017] From the above description of the utility model, it can be seen that the utility model has the following beneficial effects:

[0018] The pump provided by the utility model is an integrated pump, which combines a diaphragm pump and a peristaltic pump, and has the functions of a diaphragm pump and a peristaltic pump at the same time, with a streamlined structure. In addition, by adopting the same motor drive, the cost is also low, and the overall size is smaller than the sum of the sizes of the two traditional pumps, and the installation space occupied is small;

[0019] The two pumps are driven by the same motor. From the hardware structure, they can always work together in a fixed coordinated rhythm and always maintain a fixed output ratio. This ratio is not easily destroyed, and has high stability and strong reliability.

[0020] The transmission member includes a motor gear and a gear transmission structure, forming a stable power transmission trajectory and facilitating the design of the required deceleration or speed-up ratio requirements, thereby forming a specific pumping volume ratio of the two pumps;

[0021] There are at least two groups of diaphragm pump assemblies, which can respectively transport different media to meet the needs of complex material batching scenarios;

[0022] The diaphragm pump assembly and the motor are arranged at the same end of the motor gear, thereby making the overall structure of the integrated pump more compact;

[0023] There are at least two groups of peristaltic pump drivers, which are connected in series on the same input shaft, so that different media can be pumped simultaneously through different peristaltic pumps to meet the needs of complex material mixing scenarios;

[0024] The peristaltic pump functional component is provided with two groups of unidirectional external channels. When the motor rotates in different directions, different groups of external channels are enabled, thereby pumping different media, increasing the amount of pumping media of the integrated pump, thereby meeting the working scenario requiring two pumping steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] in:

[0027] Figure 1 An axial side view of an integrated pump Figure 1 ;

[0028] Figure 2 An axial side view of an integrated pump Figure 2 ;

[0029] Figure 3 An explosion with an integrated pump Figure 1 ;

[0030] Figure 4 An explosion with an integrated pump Figure 2 ;

[0031] Figure 5 It is a front view of an integrated pump;

[0032] Figure 6 A cross-sectional view of an integrated pump Figure 1 ;(about Figure 5 AA)

[0033] Figure 7 A cross-sectional view of an integrated pump Figure 2 ;(about Figure 5 BB)

[0034] Figure 8 This is the working diagram of the peristaltic pump assembly Figure 1 ;

[0035] Figure 9 This is the working diagram of the peristaltic pump assembly Figure 2 ;

[0036] Figures 1 to 9 The symbols in the figure are: diaphragm pump assembly 1, diaphragm pump driving part 11, eccentric wheel 111, swing frame 112, diaphragm pump functional part 12, diaphragm 121, diaphragm valve 122, peristaltic pump assembly 2, peristaltic pump driving part 21, rotating wheel 211, extrusion wheel 212, peristaltic pump functional part 22, pumping tube 221, peristaltic valve 222, first docking channel 2221, second docking channel 2222, first external channel 2223, second external channel 2224, third external channel 2225, fourth external channel 2226, motor 3, transmission part 4, motor gear 41, linkage gear 42, drive gear 43. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] See also Figures 1 to 9 , an integrated pump, including a diaphragm pump component 1, a peristaltic pump component 2, a motor 3 and a transmission component 4.

[0039] The diaphragm pump assembly 1 includes a diaphragm pump driver 11 and a diaphragm pump functional component 12, and the peristaltic pump assembly 2 includes a peristaltic pump driver 21 and a peristaltic pump functional component 22. The motor 3 drives the diaphragm pump driver 11 and the peristaltic pump driver 21 through the transmission member 4. The diaphragm pump driver 11 drives the diaphragm pump functional component 12 to perform a pumping action, and the peristaltic pump driver 21 drives the peristaltic pump functional component 22 to perform a pumping action, thereby achieving synchronous operation of the two pump assemblies driven by a single motor 3.

[0040] The transmission member 4 can be a combination of one or two of a gear-to-gear, a synchronous wheel-to-synchronous belt, or a belt-to-pulley linkage structure, and can be selected based on actual needs. Alternatively, the transmission member 4 can directly connect to and drive the diaphragm pump driver 11 and the peristaltic pump driver 21, or the transmission member 4 can directly connect to and drive either the diaphragm pump driver 11 or the peristaltic pump driver 21, and then connect to and drive the other through the driven driver. Clearly, the installation method between the transmission member 4 and the diaphragm pump driver 11 and the peristaltic pump driver 21 can be flexibly selected based on actual needs.

[0041] For example, in one embodiment, the transmission member 4 includes a motor gear 41 and a linkage gear 42. The motor gear 41 is mounted on the rotating shaft of the motor 3 and meshes with the rotatably mounted linkage gear 42, and the drive gear 43 drives the diaphragm pump driver 11 and the peristaltic pump driver 21 respectively.

[0042] In other embodiments, the transmission member 4 further includes a drive gear 43, which is mounted on the input shaft of the diaphragm pump driver 11 and meshes with the linkage gear 42. This forms a stable power transmission trajectory and facilitates the design of desired deceleration or acceleration ratios. Regarding the internal layout of the integrated pump, in one embodiment, the diaphragm pump assembly 1 and the motor 3 are disposed at the same end of the motor gear 41, making the overall structure of the integrated pump more compact.

[0043] In another embodiment, the input shaft of the peristaltic pump driver 21 can also use the drive gear 43 to connect the linkage gear 42, or, in other embodiments, the input shaft of the peristaltic pump driver 21 is coaxial with the linkage gear 42 and is integrally formed or assembled together, so that the linkage gear 42 directly drives the peristaltic pump driver 21 without the need for additional connecting parts, thereby further streamlining the structure.

[0044] Based on the above embodiment, in one implementation, the diaphragm pump driver 11 includes an eccentric 111 and a swing frame 112, and the diaphragm pump functional component 12 includes a diaphragm 121 and a diaphragm valve 122. The eccentric 111 is driven to rotate by the input shaft of the diaphragm pump driver 11. The eccentric 111 drives the diaphragm 121 to expand and contract via the swing frame 112. The diaphragm 121 draws and discharges the medium to be transported via the diaphragm valve 122. The peristaltic pump driver 21 includes a rotating wheel 211 and an extrusion wheel 212, and the peristaltic pump functional component 22 includes a pumping tube 221. The rotating wheel 211 is driven to rotate by the input rotating shaft of the peristaltic pump driving member 21 and is provided with a coaxial annular groove. At least one extrusion wheel 212 is eccentrically mounted in the annular groove. The pumping tube 221 is U-shaped and wound around the annular groove and the outer periphery of the extrusion wheel 212. The extrusion wheel 212 is driven to rotate by the rotating wheel 211 and drives the pumping tube 221 to suck and discharge the medium to be transported by pushing.

[0045] In another embodiment, based on the above embodiment, the peristaltic pump function component 22 further includes a peristaltic valve 222. To enable the same peristaltic pump function component 22 to transport different media, the peristaltic valve 222 is provided with a first docking channel 2221, a second docking channel 2222, a first external channel 2223, a second external channel 2224, a third external channel 2225, and a fourth external channel 2226. The first docking channel 2221 and the second docking channel 2222 respectively connect to the two ends of the pumping tube 221 of the peristaltic pump function component 22. The first external channel 2223 and the second external channel 2224 are one-way channels in opposite directions (with springs and plugs installed therein to form one-way valve structures), and one end of each connects to the first docking channel 2221. The third external channel 2225 and the fourth external channel 2226 are one-way channels in opposite directions, and one end of each connects to the second docking channel 2222. The first external channel 2223 and the fourth external channel 2226 are both feed channels, the second external channel 2224 and the third external channel 2225 are both discharge channels, the first external channel 2223 and the third external channel 2225 are used in conjunction with each other, and the fourth external channel 2226 and the second external channel 2224 are used in conjunction with each other. When the motor 3 rotates forward, the first external channel 2223 sucks material, and the third external channel 2225 discharges material. When the motor 3 rotates reversely, the fourth external channel 2226 sucks material, and the second external channel 2224 discharges material. It should be noted that no matter whether the motor 3 rotates forward or reversely, the feed end and the discharge end of the diaphragm pump functional part 12 remain unchanged. Therefore, when in use, the medium sucked by the diaphragm pump functional part 12 and the first medium sucked by the peristaltic pump functional part 22 can be used together through the forward rotation of the motor 3. Thereafter, the medium sucked by the diaphragm pump functional part 12 and the second medium sucked by the peristaltic pump functional part 22 can be used together through the reverse rotation of the motor 3. For example, when the toilet is flushed, water and cleaning liquid are mixed first to form cleaning water for flushing the toilet, followed by a mixture of water and foaming liquid to form a foam water seal for the toilet.

[0046] In one embodiment, at least two diaphragm pump assemblies 1 are provided, each of which is distributed around the linkage gear 42 via a drive gear 43, capable of separately conveying different media. For example, with two diaphragm pump assemblies 1, water and air can be conveyed simultaneously, providing water and air for the foam water seal. Alternatively, in other embodiments, at least two peristaltic pump drive members 21 are provided, connected in series on the same input shaft, thereby simultaneously pumping different media through different peristaltic pumps. For example, with two peristaltic pump assemblies 2, cleaning liquid and disinfectant can be conveyed simultaneously, or foaming liquid and disinfectant can be conveyed simultaneously.

[0047] The pump provided by the present invention is an integrated pump, which combines a diaphragm 121 pump and a peristaltic pump, and is driven synchronously by the same motor 3. On the one hand, it has the functions of the diaphragm 121 pump and the peristaltic pump, and has a streamlined structure. It is driven by the same motor 3, the cost is also low, and the overall size is smaller than the sum of the sizes of the two traditional pumps, and the installation space occupied is small. On the other hand, the two pumps are driven by the same motor 3. From the hardware structure, it can be achieved that they always work together in a fixed coordinated rhythm and always maintain a fixed output ratio. The ratio is not easily destroyed, and it has high stability and strong reliability.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0049] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] In the present invention, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0053] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present invention.

Claims

1. An integrated pump, characterized in that: Includes diaphragm pump assembly, peristaltic pump assembly, motor and transmission parts; The diaphragm pump assembly includes a diaphragm pump drive and a diaphragm pump functional part, and the peristaltic pump assembly includes a peristaltic pump drive and a peristaltic pump functional part; the motor drives the diaphragm pump drive and the peristaltic pump drive through the transmission part, the diaphragm pump drive drives the diaphragm pump functional part to perform pumping action, and the peristaltic pump drive drives the peristaltic pump functional part to perform pumping action.

2. An integrated pump according to claim 1, characterized in that: The transmission member directly connects with and drives the diaphragm pump driving member and the peristaltic pump driving member, or the transmission member directly connects with and drives any one of the diaphragm pump driving member and the peristaltic pump driving member, and then connects with and drives the other one through the driven driving member.

3. An integrated pump according to claim 1, characterized in that: The transmission member adopts one or a combination of two of the gear and gear, synchronous wheel and synchronous belt or belt and pulley linkage structure.

4. The integrated pump according to claim 1, characterized in that: The transmission member includes a motor gear and a linkage gear; the motor gear is installed on the rotating shaft of the motor and meshes with the rotatably installed linkage gear, and the linkage gear then drives the diaphragm pump drive member and the peristaltic pump drive member respectively.

5. An integrated pump according to claim 4, characterized in that: The transmission member further comprises a driving gear, which is sleeved on the input shaft of the diaphragm pump driving member and / or the peristaltic pump driving member and meshes with the linkage gear.

6. An integrated pump according to claim 5, characterized in that: There are at least two groups of diaphragm pump components, and both are distributed around the linkage gear through a driving gear.

7. An integrated pump according to claim 4 or 6, characterized in that: The diaphragm pump assembly and the motor are arranged on the same end of the motor gear.

8. The integrated pump according to claim 4, characterized in that: The input rotating shaft of the peristaltic pump driving member is coaxial with the linkage gear and is integrally formed or assembled together.

9. The integrated pump according to claim 8, characterized in that: There are at least two groups of peristaltic pump driving components, which are connected in series on the same input shaft.

10. The integrated pump according to claim 1, characterized in that: The diaphragm pump drive component includes an eccentric wheel and a swing frame, and the diaphragm pump functional parts include a diaphragm and a diaphragm valve; the eccentric wheel is driven to rotate by the input shaft of the diaphragm pump drive component, and the eccentric wheel drives the diaphragm to expand and contract through the swing frame, and the diaphragm sucks and discharges the medium to be transported through the diaphragm valve; the peristaltic pump drive component includes a rotating wheel and an extrusion wheel.

11. An integrated pump according to claim 10, characterized in that: The peristaltic pump functional part includes a pumping tube; the runner is driven to rotate by the input shaft of the peristaltic pump drive component and is provided with a coaxial annular groove. At least one extrusion wheel is eccentrically mounted in the annular groove. The pumping tube is U-shaped and wrapped around the annular groove and the outer periphery of the extrusion wheel. The extrusion wheel is driven to rotate by the runner and drives the pumping tube to suck and discharge the medium to be transported by pushing.

12. An integrated pump according to claim 1 or 11, characterized in that: The peristaltic pump functional part also includes a peristaltic valve, which is provided with a first docking channel, a second docking channel, a first external channel, a second external channel, a third external channel and a fourth external channel; the first docking channel and the second docking channel are respectively connected to the two ends of the pumping tube of the peristaltic pump functional part; the first external channel and the second external channel are one-way channels in opposite directions, and one end of each is connected to the first docking channel; the third external channel and the fourth external channel are one-way channels in opposite directions, and one end of each is connected to the second docking channel; the first external channel and the fourth external channel are both feed channels, the second external channel and the third external channel are both discharge channels, the first external channel and the third external channel are used in combination, and the fourth external channel and the second external channel are used in combination.

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