Water pump housing, water pump and coffee machine

Abstract

The utility model discloses part embodiments relate to a kind of pump liquid devices, especially a kind of shell of fixed water pump, water pump and coffee machine, the transmission assembly that can act on the drive unit of the water passing device of water pump is arranged in the shell, shell includes: bottom side, the top side parallel with bottom side and installation side opposite to bottom side along preset axis direction, installation side is detachably arranged for connecting the drive device of transmission assembly;The vertical distance from installation side to bottom side is less than the vertical distance from top side to bottom side, so that shell has part protruding from installation side along preset axis direction, forms the boss for supporting drive device.Compared with prior art, the volume of smaller water pump can be effectively reduced, so that the structure of portable coffee machine is more compact, more conducive to the miniaturization of portable coffee machine.

Description

Technical Field

[0001] Some embodiments of this utility model relate to a pumping device, and more particularly to a housing of a constant water pump, a water pump, and a coffee machine. Background Technology

[0002] A water pump, as a driving device for pumping liquids, can automatically draw in and pump out liquid media based on received control signals. Therefore, water pumps can be widely used in various fields.

[0003] Portable coffee machines, as portable devices that directly extract coffee from ground coffee or coffee capsules, are small and easy to carry, allowing users to enjoy freshly brewed coffee anytime, anywhere. However, to achieve an even smaller size, there are higher demands for miniaturization of various components, especially the water pump. Currently, water pumps for coffee machines are generally purchased directly, meaning their size hasn't been optimized for portable designs, thus hindering the miniaturization of portable coffee machines. Utility Model Content

[0004] The purpose of this invention is to design a water pump housing, a water pump, and a coffee machine, which can effectively reduce the size of the water pump, making the portable coffee machine more compact and facilitating its miniaturization.

[0005] To achieve the above objectives, some embodiments of this utility model provide a housing for a water pump, wherein a transmission component capable of acting on a water-passing device of the water pump is disposed within the housing, and the housing includes, along a predetermined axis, a bottom side, a top side opposite to and parallel to the bottom side, and a mounting side, wherein a drive device for connecting the transmission component is detachably disposed on the mounting side. Wherein, the vertical distance from the mounting side to the bottom side is less than the vertical distance from the top side to the bottom side, so that a portion of the housing protrudes from the mounting side along the preset axis direction, forming a boss for supporting the drive device.

[0006] In addition, some embodiments of this utility model also provide a water pump, the water pump comprising: The casing as described above; A water-passing device, detachably mounted on the housing, is used for the intake and pumping out of liquid media; A transmission component is disposed inside the housing and acts on the water-passing device during transmission, so that the water-passing device can circulate liquid medium. A drive unit is detachably mounted on the mounting side of the housing and connected to the transmission assembly; the drive unit is used to drive the transmission assembly, so that the transmission assembly acts on the water-passing device.

[0007] In addition, some embodiments of this utility model also provide a coffee machine, which includes: a water pump as described above.

[0008] Compared with the prior art, the embodiments of this utility model have the following advantages: the water pump housing includes a bottom side, a top side opposite to and parallel to the bottom side, and a mounting side along a preset axis. The mounting side can be used to install the water pump drive device, and the vertical distance between the mounting side and the bottom side is less than the vertical distance between the top side and the bottom side. This not only effectively reduces the overall height of the water pump, but also makes the structure of the coffee machine more compact when this type of water pump is applied to a portable coffee machine, which is more conducive to the miniaturization of the portable coffee machine. Furthermore, the housing can have a portion protruding from the mounting side along the preset axis, forming a boss. The boss can support the drive device, thereby effectively reducing the vibration generated by the drive device during operation, and making the water pump have better reliability and stability during operation. Attached Figure Description

[0009] Figure 1 This is an isometric view of the pump casing in some embodiments of the present invention; Figure 2 This is an isometric view of the water pump housing and water-passing device during assembly in some embodiments of the present invention; Figure 3 This is an isometric view of the water pump in some embodiments of the present invention; Figure 4 for Figure 3 A diagram showing the view from below; Figure 5 for Figure 4 Schematic diagram of the cross section at point AA; Figure 6 for Figure 4 Schematic diagram of the cross section at point BB; Figure 7 for Figure 3 A top-down view; Figure 8 for Figure 7 Cross-sectional view at point CC. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this utility model to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and with various changes and modifications based on the following embodiments.

[0011] Example 1 Embodiment 1 of this utility model relates to a water pump housing, such as... Figure 1 and Figure 6 As shown, the housing 1 contains a transmission assembly 3 that can act on the water pump's water-passing device 2. The housing 1, along a predetermined axis, includes: a bottom side 11, a top side 12 opposite to and parallel to the bottom side 11, and a mounting side 13. Figure 3 As shown, the mounting side 13 is detachably provided with a drive device 4 for connecting the transmission assembly 3.

[0012] Among them, such as Figure 1 and Figure 2 As shown, the vertical distance between the mounting side 13 and the bottom side 11 is less than the vertical distance between the top side 12 and the bottom side 11, so that the outer shell 1 protrudes from the mounting side 13 along the preset axis direction, forming a boss 14 for supporting the drive device 4.

[0013] As can be seen from the above, since the housing 1 of the water pump includes a bottom side 11, a top side 12 and a mounting side 13 arranged parallel to and opposite to the bottom side 11 along the preset axis, the mounting side 13 can be used to install the drive device 4 of the water pump, and the vertical distance between the mounting side 13 and the bottom side 11 is less than the vertical distance between the top side 12 and the bottom side 11, the overall height of the water pump can be effectively reduced. Therefore, when this type of water pump is applied to a portable coffee machine, the structure of the coffee machine can be made more compact, which is more conducive to the miniaturization of the portable coffee machine. Moreover, the housing 1 can have a part protruding from the mounting side 13 along the preset axis, so that the protruding part can form a boss 14. The boss 14 can support the drive device 4, thereby effectively reducing the vibration generated by the drive device 4 during operation, so that the water pump has better reliability and stability when working.

[0014] Specifically, in some embodiments, such as Figure 1 and Figure 2As shown, the housing 1 also includes a splicing side 15, which is located between the top side 12 and the bottom side 11, and is perpendicular to the top side 12 and the bottom side 11, so that the water pump's water-passing device 2 is detachably installed on the splicing side 15, and a seal is formed between the water pump and the water-passing device 2, so that the water-passing device 2 can realize the intake and pumping of liquid medium under the transmission action of the transmission component 3.

[0015] Furthermore, in order for the water-passing device 2 to achieve the intake and pumping of liquid media under the transmission action of the transmission component 3, in some embodiments, such as Figure 1 and Figure 5 As shown, a positioning groove 16 can be provided on the splicing side 15 of the outer shell 1. The positioning groove 16 can be used to install the diaphragm 31 of the transmission assembly 3. The positioning groove 16 can position the diaphragm 31 circumferentially, and at the same time, the positioning groove 16 is used for the displacement and deformation of the diaphragm 31 axially. It is easy to see that the diaphragm 31 of the transmission assembly 3 can be displaced and deformed axially under the driving action of the driving device 4, so that the diaphragm 31 can provide positive or negative pressure to the water-passing device 2. Therefore, the water-passing device 2 can realize the suction of liquid medium under negative pressure, and the pumping of liquid medium under positive pressure.

[0016] Example 2 Embodiment 2 of this utility model relates to a water pump, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the water pump includes: a housing 1, a water-passing device 2, a transmission assembly 3, and a drive device 4 as described in Embodiment 1.

[0017] Among them, such as Figure 2 As shown, the water-passing device 2 is detachably mounted on the housing 1, and is used for the intake and pumping out of the liquid medium. Furthermore, the transmission assembly 3 is disposed inside the housing 1, and during transmission, the transmission assembly 3 acts on the water-passing device 2, causing the water-passing device 2 to continuously intake and pump out the liquid medium.

[0018] In addition, such as Figure 2 As shown, the drive device 4 is detachably mounted on the mounting side 13 of the housing 1 and connected to the transmission assembly 3. The drive device 4 is used to drive the transmission assembly 3 so that the transmission assembly 3 can act on the water-passing device 2. Therefore, the water-passing device 2 can continuously generate negative pressure for sucking in liquid medium and continuously generate positive pressure for pumping out liquid medium.

[0019] As can be seen from the above, the water pump housing 1 includes a bottom side 11, a top side 12 and a mounting side 13 arranged parallel to and opposite to the bottom side 11 along a preset axis direction, and the water-passing device 2 is detachably mounted on the housing 1. The transmission assembly 3 is located inside the housing 1. In addition, since the water pump drive device 4 is located on the mounting side 13 of the housing 1, the drive device 4 can be connected to the transmission assembly 3 and can be used to drive the transmission assembly 3. Therefore, the transmission assembly 4 can be driven by the drive device 4 to perform transmission and act on the water-passing device 2, so that the water-passing device 2 can continuously generate negative pressure for sucking in liquid medium and positive pressure for pumping out liquid medium. Therefore, when the water pump is applied to a coffee machine, the water pump can realize the sucking in and pumping out of liquid medium, thereby completing the extraction of coffee powder. In addition, since the vertical distance between the mounting side 13 and the bottom side 11 of the housing 1 is less than the vertical distance between the top side 12 and the bottom side 11, the overall height of the water pump can be effectively reduced. Furthermore, the housing 1 can protrude from the mounting side 13 along the preset axis, forming a boss 14. The boss 14 can support the drive device 4, thereby effectively reducing the vibration generated by the drive device 4 during operation, and making the water pump more reliable and stable during operation.

[0020] Specifically, in some embodiments, such as Figure 6 As shown, the transmission assembly 3 includes: a mounting base 32, an eccentric wheel 33, a bearing 34, and a diaphragm 31. Wherein, as... Figure 6 As shown, the mounting base 32 has a mounting hole 321 along a preset axis. Next, an eccentric wheel 33 is disposed within the mounting hole 321 and connected to the drive device 4, and this eccentric wheel 33 is used to rotate eccentrically around the preset axis under the drive of the drive device 4. Additionally, as... Figure 6 As shown, the bearing 34 is disposed within the mounting hole 321 and coaxially fixed with the mounting base 32. The bearing 34 includes an inner ring (not shown) rotatably connected to the eccentric wheel 33 and an outer ring (not shown) rotatably connected to the mounting base 32. Simultaneously, the bearing 34 is used to convert the eccentric rotation of the eccentric wheel 33 into linear motion of the mounting base 32, and the direction of the linear motion of the mounting base 32 is perpendicular to the preset axis direction. Finally, as... Figure 6As shown, the diaphragm 31 is disposed on the outer shell 1, and the diaphragm 31 is connected to the mounting base 32 along the linear movement direction of the mounting base 32. Therefore, when the mounting base 32 moves linearly, the diaphragm 31 can generate displacement and deformation on the outer shell 1, and can apply this displacement and deformation to the water-passing device 2, so that the water-passing device 2 can continuously draw in and pump out liquid medium. It is not difficult to find that, by means of the characteristic that the inner and outer rings of the bearing 34 rotate relative to each other, when the eccentric wheel 33 is driven by the driving device 4, the mounting base 32 can only bear the radial force of the eccentric wheel 33, and will not bear the torsional force of the eccentric wheel 33. This allows the mounting base 32 to only reciprocate linearly along its own radial direction without rotation. Therefore, the diaphragm 31 can generate displacement and deformation under the linear movement of the mounting base 32. Furthermore, in some embodiments, such as Figure 3 , Figure 5 and Figure 6 As shown, the drive device 4 is a motor mounted on the mounting side 13 of the housing 1, and the main shaft of the motor extends into the housing 1 and is connected to the eccentric wheel 33, so that the eccentric wheel 33 can rotate eccentrically around a preset axis under the drive of the motor. It should be noted that in this example, the drive device 4 is only described using a motor as an example. In other embodiments, the drive device 4 can also use other drive elements. However, in this embodiment, the type of drive device 4 is not specifically limited.

[0021] Furthermore, corresponding to the displacement and deformation direction of the diaphragm 31, in other embodiments, such as Figure 2 and Figure 3 As shown, the water distribution device 2 includes a water distributor 21 and a water distributor 22. The water distributor 21 is detachably connected to the outer casing 1 and faces the diaphragm 31. Meanwhile, as... Figure 5 and Figure 8 As shown, a liquid chamber 23 is also formed between the distributor 21 and the diaphragm 31. This liquid chamber 23 is used to generate positive or negative pressure when the diaphragm 31 undergoes displacement and deformation. For example, when the diaphragm 31 displaces and deforms away from the distributor 21, the liquid chamber 23 can generate negative pressure. Conversely, when the diaphragm 31 displaces and deforms towards the distributor 21, the liquid chamber 23 can generate positive pressure. Furthermore, in conjunction with... Figure 2 and Figure 3 As shown, the water distributor 22 is located on the side of the water distributor 21 facing away from the outer casing 1, and as... Figure 5 and Figure 8As shown, the water filter 22 has an inlet passage 221 and an outlet passage 222, which are separated from each other and not interconnected. Corresponding to the inlet passage 221 and the outlet passage 222, an inlet connector 223 communicating with the inlet passage 221 and an outlet connector 224 communicating with the outlet passage 222 can be respectively provided on the water filter 22. The inlet connector 223 and the outlet connector 224 can be connected to external devices. For example, when the water pump is used in a coffee machine, the inlet connector 223 can be connected to the coffee machine's inlet pipe, and the outlet connector 224 can be connected to the coffee machine's outlet pipe. This allows the coffee machine to draw liquid from its liquid tank and pump the drawn liquid into the coffee powder container, thereby extracting coffee powder from the coffee powder container.

[0022] Additionally, it is worth mentioning that, in order for the distributor 21 to connect the inlet passage 221 to the liquid chamber 23 and simultaneously disconnect the outlet passage 222 from the liquid chamber 23 when a negative pressure is generated in the liquid chamber 23, and also to enable the distributor 21 to disconnect the inlet passage 221 from the liquid chamber 23 and simultaneously connect the outlet passage 222 to the liquid chamber 23 when a positive pressure is generated in the liquid chamber, in some other embodiments, such as Figure 5 and Figure 8 As shown, the water distributor 21 includes: a water distribution plate 211, a first check valve 212, and a second check valve 213. The water distribution plate 211 is provided with at least one inlet hole 214 and at least one outlet hole 215, and as shown... Figure 8 As shown, the first check valve 212 is installed on the water distribution plate 211. This first check valve 212 is used to open each inlet hole 214 when negative pressure is generated in the liquid chamber 23, thus connecting the liquid inlet passage 221 and the liquid chamber 23. Conversely, the first check valve 212 is also used to block each inlet hole 214 when positive pressure is generated in the liquid chamber 23, thus disconnecting the liquid inlet passage 221 and the liquid chamber 23. Additionally, as... Figure 5As shown, the second check valve 213 is installed on the water distribution plate 211. This second check valve 213 is used to block each outlet hole 215 when the liquid chamber 23 generates negative pressure, thus disconnecting the outlet passage 222 from the liquid chamber 23. Conversely, the second check valve 213 is also used to open each outlet hole 215 when the liquid chamber 23 generates positive pressure, thus connecting the outlet passage 222 to the liquid chamber 23. It is easy to see that when the liquid chamber 23 is under negative pressure, the opening of each inlet hole 214 by the first check valve 212 and the blocking of each outlet hole 215 by the second check valve 213 allow the liquid medium to enter the liquid chamber 23 through the inlet connector 223 and the inlet passage 221, thereby achieving the intake of the liquid medium. When the liquid chamber 23 is under positive pressure, the first check valve 212 blocks each liquid inlet hole 214, and the second check valve 213 opens each liquid outlet hole 215, so that the liquid medium entering the liquid chamber 23 can be discharged through the liquid outlet passage 222 and the liquid outlet connector 224, thereby realizing the pumping out of the liquid medium.

[0023] From the above, it can be seen that regardless of whether the liquid chamber 23 is under negative or positive pressure, the working states of the first check valve 212 and the second check valve 213 are opposite, thus enabling the water-passing device 2 to achieve the intake and pumping of the liquid medium. To ensure that the first check valve 212 and the second check valve 213 meet this working state, both the first check valve 212 and the second check valve 213 can be flexible components, and such as... Figure 8 As shown, the first check valve 212 includes: a first shaft 2121, a first sealing portion 2122 disposed at one end of the first shaft 2121, and a first limiting protrusion 2123 disposed on the first shaft 2121. Similarly, as Figure 5 As shown, the second check valve 213 includes: a second shaft 2131, a second sealing portion 2132 disposed at one end of the second shaft 2131, and a second limiting protrusion 2133 disposed on the second shaft 2131. The first shaft 2121 and the second shaft 2131 can both pass through the water distribution plate 211 in opposite directions, such that the first sealing portion 2122 and the first limiting protrusion 2123 of the first check valve 212, and the second sealing portion 2132 and the second limiting protrusion 2133 of the second check valve 213, can all be clamped on both sides of the water distribution plate 211. Furthermore, the first sealing portion 2122 of the first check valve 212 can block the outlet side of each inlet hole 214, and the second sealing portion 2132 of the second check valve 213 can block the outlet side of each storage hole 215. Therefore, when the liquid chamber 23 is in a negative pressure state, such as... Figure 5 and Figure 8As shown, the first sealing part 2122 can deform under the negative pressure and open each liquid inlet hole 214, while the second sealing part 2122 can stably block the liquid outlet side of each liquid outlet hole 215 under the negative pressure, allowing the water filter 22 to draw in the liquid medium. Conversely, when the liquid chamber 23 is under positive pressure, such as... Figure 5 and Figure 8 As shown, the first sealing part 2122 can stably block the liquid outlet side of each liquid inlet hole 214 under the positive pressure, while the second sealing part 2122 can deform under the positive pressure and open each liquid outlet hole 215, so that the water pump 22 can pump out the liquid.

[0024] Additionally, as a preferred embodiment, in other embodiments, such as Figure 6 As shown, the mounting base 32 and the diaphragm 31 can be detachably connected via a connecting assembly 36, which can be used to adjust the relative position between the diaphragm 31 and the housing 1. Therefore, by adjusting the position of the diaphragm 31 through the connecting assembly 36, the displacement and deformation of the diaphragm 31 on the housing 1 can be changed, thereby effectively adjusting the positive and negative pressures of the liquid chamber 23, allowing the water pump to meet the usage requirements of different equipment.

[0025] Furthermore, in order to enable the connecting assembly 36 to adjust the relative position between the diaphragm 31 and the housing 1, in some embodiments, such as Figure 6 As shown, the mounting base 32 includes a base body 322 and a connecting portion 323. The base body 322, about a predetermined axis, includes an inner surface 3221 forming a mounting hole 321 and an outer surface 3222 opposite to the inner surface 3221. The connecting portion 323 is formed by a portion of the outer surface 3222 of the base body 322 protruding away from the inner surface 3221. Furthermore, regarding the structure of the mounting base 32, as... Figure 6 As shown, the connecting assembly 36 includes: a threaded sleeve 361 disposed in the connecting part 323 and a screw connector 362 connected to the diaphragm 31. The screw connector 362 is used to insert into the threaded sleeve 361 and is threadedly connected to the threaded sleeve 361. Therefore, by means of the threaded connection between the screw connector 362 and the threaded sleeve 361, the relative position between the diaphragm 31 and the outer shell 1 can be adjusted when the diaphragm 31 rotates, thereby achieving the purpose of adjusting the positive pressure and negative pressure of the liquid chamber 23.

[0026] Example 3 Embodiment 3 of this utility model relates to a coffee machine, which includes a water pump as described in Embodiment 2.

[0027] As can be seen from the above, when a water pump is used in a portable coffee machine, the structure of the coffee machine can be made more compact, which is more conducive to the miniaturization of the portable coffee machine. Moreover, the outer shell 1 can protrude from the mounting side 13 along the preset axis direction, so that the protruding part can form a boss 14. The boss 14 can support the drive device 4, thereby effectively reducing the vibration generated by the drive device 4 during operation, so that the water pump has better reliability and stability when working.

[0028] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A housing for a water pump, wherein a transmission assembly (3) capable of acting on a water-passing device (2) of the water pump is disposed within the housing (1), characterized in that, The outer casing (1) includes, along a preset axis, a bottom side (11), a top side (12) opposite to and parallel to the bottom side (11), and a mounting side (13), and the mounting side (13) is detachably provided with a drive device (4) for connecting the transmission assembly (3). The vertical distance from the mounting side (13) to the bottom side (11) is less than the vertical distance from the top side (12) to the bottom side (11), so that the outer shell (1) protrudes from the mounting side (13) along the preset axis direction, forming a boss (14) for supporting the drive device (4).

2. The housing of the water pump according to claim 1, characterized in that, The outer shell (1) further includes a splicing side (15), which is located between the top side (12) and the bottom side (11) and is perpendicular to the top side (12) and the bottom side (11). The splicing side (15) is detachably equipped with a water pump water-passing device (2) and forms a seal with the water-passing device (2).

3. The housing of the water pump according to claim 2, characterized in that, The splicing side (15) is also provided with a positioning groove (16) for mounting the diaphragm (31) of the transmission assembly (3). The positioning groove (16) positions the diaphragm (31) circumferentially and is used for the displacement and deformation of the diaphragm (31) axially.

4. A water pump, characterized in that, The water pump includes: The outer casing (1) as described in any one of claims 1-3; A water-passing device (2) is detachably mounted on the outer casing (1) for the intake and pumping out of liquid media; The transmission component (3) is disposed inside the housing (1) and acts on the water-passing device (2) during transmission, so that the water-passing device (2) continuously draws in and pumps out liquid medium; The drive device (4) is detachably disposed on the mounting side (13) of the housing (1) and connected to the transmission assembly (3); the drive device (4) is used to drive the transmission assembly (3) so that the transmission assembly (3) acts on the water-passing device (2).

5. The water pump according to claim 4, characterized in that, The transmission assembly (3) includes: Mounting base (32); the mounting base (32) is provided with mounting holes (321) along the preset axis direction; An eccentric wheel (33) is disposed in the mounting hole (321) and connected to the drive device (4), and is used to rotate eccentrically around the preset axis direction under the drive of the drive device (4). A bearing (34) is disposed in the mounting hole (321) and coaxially fixed with the mounting base (32); the bearing (34) includes: an inner ring rotatably connected to the eccentric wheel (33) and an outer ring rotatably connected to the mounting base (32). The bearing (34) is used to convert the eccentric rotation of the eccentric wheel (33) into the linear motion of the mounting base (32), and the direction of the linear motion of the mounting base (32) is perpendicular to the preset axis direction. A diaphragm (31) is disposed on the outer shell (1) and connected to the mounting base (32) along the linear movement direction of the mounting base (32); the diaphragm (31) is used to generate displacement and deformation on the outer shell (1) when the mounting base (32) moves in a straight line, and to act on the water-passing device (2) so that the water-passing device (2) can draw in and pump out liquid medium.

6. The water pump according to claim 5, characterized in that, The mounting base (32) and the diaphragm (31) are detachably connected by a connecting component (36), which is used to adjust the relative position between the diaphragm (31) and the outer shell (1).

7. The water pump according to claim 6, characterized in that, The mounting base (32) includes: The base body (322) includes, about the preset axis, an inner surface (3221) forming the mounting hole (321) and an outer surface (3222) opposite to the inner surface (3221). The connecting portion (323) is formed by a portion of the outer surface (3222) of the seat body (322) protruding away from the inner surface (3221); The connecting component (36) includes: a threaded sleeve (361) disposed in the connecting part (323) and a connecting screw connector (362) connected to the diaphragm (31), wherein the connecting screw connector (362) is used to insert into the threaded sleeve (361) and threadedly connected to the threaded sleeve (361).

8. The water pump according to claim 5, characterized in that, The water-passing device (2) includes: The water distributor (21) is detachably connected to the outer shell (1) and is opposite to the diaphragm (31); wherein, a liquid cavity (23) is formed between the water distributor (21) and the diaphragm (31), and the liquid cavity (23) is used to generate positive or negative pressure when the diaphragm (31) undergoes displacement and deformation; A water filter (22) is disposed on the side of the water distributor (21) away from the outer casing (1); the water filter (22) has an inlet passage (221) and an outlet passage (222). The water separator (21) is used to connect the liquid chamber (23) to the liquid inlet passage (221) and disconnect the liquid chamber (23) from the liquid outlet passage (222) when the liquid chamber (23) generates negative pressure. The water separator (21) is also used to connect the liquid chamber (23) to the liquid outlet passage (222) and disconnect the liquid chamber (23) from the liquid inlet passage (221) when the liquid chamber (23) generates positive pressure.

9. The water pump according to claim 8, characterized in that, The water distributor (21) includes: Water distribution plate (211); the water distribution plate (211) is provided with at least one liquid inlet hole (214) and at least one liquid outlet hole (215); A first check valve (212) is disposed on the water distribution plate (211); the first check valve (212) is used to open each of the liquid inlet holes (214) when the liquid chamber (23) generates negative pressure, so that the liquid inlet passage (221) and the liquid chamber (23) are connected; the first check valve (212) is also used to block each of the liquid inlet holes (214) when the liquid chamber (23) generates positive pressure, so that the liquid inlet passage (221) and the liquid chamber (23) are disconnected; The second check valve (213) is disposed on the water distribution plate (211); the second check valve (213) is used to block each of the liquid outlet holes (215) when the liquid chamber (23) generates negative pressure, so that the liquid outlet passage (222) and the liquid chamber (23) are disconnected; the second check valve (213) is also used to open each of the liquid outlet holes (215) when the liquid chamber (23) generates positive pressure, so that the liquid outlet passage (222) and the liquid chamber (23) are connected.

10. A coffee machine, characterized in that, The coffee machine includes a water pump as described in any one of claims 4-9.

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