Water pump and dishwasher

Abstract

The present application provides a water pump and a dishwasher. The water pump provided in the present application comprises a pump shell. The pump shell comprises a pump shell main body and a water outlet part which are connected together. A pump cavity and a water outlet communicated with the pump cavity are formed in the pump shell main body. A water outlet channel is formed in the water outlet part. One end of the water outlet channel forms a cavity inlet communicated with the pump cavity, the other end of the water outlet channel forms a water outlet, and the cavity inlet is located below the top cavity wall of the pump cavity. The pump shell is further provided with a gas discharge channel extending from the pump shell main body to the water outlet part, and the gas discharge channel is communicated with the top space of the pump cavity and the water outlet channel.

Description

Water pumps and dishwashers

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on January 15, 2024, with application numbers 202420100530.2 and 202410059881.8, both with the invention name “Water Pump and Dishwasher”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of dishwashers, and in particular to a water pump and a dishwasher using the water pump. Background Art

[0003] A dishwasher automatically washes dishes, including bowls, chopsticks, plates, dishes, knives, and forks. Currently, the most commonly used type is the spray-type dishwasher. When the dishwasher is operating, water enters the water cup through the water inlet pipe. Once the water reaches a certain level, the wash pump draws water from the cup and pressurizes it. The pressurized water then flows from the wash pump's outlet into the spray arms to clean the dishes. Therefore, the performance of the wash pump has a significant impact on the overall performance of the dishwasher.

[0004] In the related art, air entrapment is easily generated in the washing pump of the dishwasher, which affects the performance of the washing pump and further affects the performance of the dishwasher.

[0005] Summary of the Invention

[0006] The present application provides a water pump and a dishwasher, which are configured to solve the problem of air entrapment easily occurring in a washing pump in the related art.

[0007] On the one hand, the present application provides a water pump, including a pump casing, the pump casing including a pump casing main body and a water outlet, the pump casing main body and the water outlet are connected together; the pump casing main body is formed with a pump chamber and a water inlet, the water inlet is connected to the pump chamber, and a water outlet channel is formed in the water outlet, one end of the water outlet channel is formed as an intra-cavity inlet, the intra-cavity inlet is connected to the pump chamber, the other end of the water outlet channel is formed as a water outlet, and the intra-cavity inlet is located below the cavity top wall of the pump chamber; the pump casing is also provided with an exhaust channel, the exhaust channel extends from the pump casing main body to the water outlet, and the exhaust channel connects the top space of the pump chamber and the water outlet channel.

[0008] As an optional embodiment, the pump casing further includes a connecting portion, with two ends of the connecting portion respectively connected to the pump casing body and the water outlet.

[0009] As an optional embodiment, the shell wall of the pump housing, the shell wall of the water outlet portion, and the connecting portion define an exhaust channel. The exhaust channel can form the above-mentioned exhaust channel, and the gas located in the top space of the pump chamber can be discharged into the water outlet channel through the exhaust channel.

[0010] As an optional embodiment, the exhaust channel extends horizontally. This shortens the path for gas to escape from the top space into the water outlet channel. In other words, the time required for gas in the top space to escape into the water outlet channel is shorter, allowing gas in the top space to be quickly exhausted. This improves the stability of the water pump's operating power and reduces noise during operation. Furthermore, it prevents excessive gas from adhering to the surface of the heating tube, thereby preventing dry heating.

[0011] As an optional embodiment, the cavity wall of the pump cavity further includes a cavity side wall, and the cavity side wall is connected to the periphery of the cavity top wall.

[0012] As an optional embodiment, the cavity top wall and the cavity side wall at the top define a top space, and the exhaust channel runs through the cavity side wall defining the top space. Gas in the top space can be discharged into the water outlet channel through the exhaust channel.

[0013] As an optional embodiment, the sidewalls of the cavity defining the headspace are smooth. Even when the exhaust channel and the headspace are indirectly connected, the friction between the second cavity sidewall and the gas is low, reducing the resistance to gas flow through the second cavity sidewall. This improves exhaust efficiency and reduces noise generated by gas flow.

[0014] As an optional embodiment, the exhaust channel is an exhaust hole. That is, one end of the exhaust hole penetrates the side wall of the second chamber and communicates with the top space, and the other end of the exhaust hole penetrates the shell wall of the water outlet portion and communicates with the water outlet channel. Gas in the top space can be discharged into the water outlet channel through the exhaust hole.

[0015] As an optional embodiment, the wall of the exhaust hole is connected to the cavity top wall. There is no other transition wall between the wall surface of the cavity top wall and the wall surface of the exhaust hole. The gas in the top space can be quickly discharged into the exhaust hole, thereby improving the exhaust efficiency and further preventing the occurrence of air entrapment inside the pump cavity to a certain extent.

[0016] As an optional embodiment, the exhaust hole wall is a smooth wall. In other words, the exhaust hole wall has neither protrusions nor pits, so the friction between the airflow and the exhaust hole wall is small, which can reduce the resistance of the airflow when flowing through the exhaust hole, thereby improving the gas exhaust efficiency and reducing the noise generated by the gas flow.

[0017] As an optional implementation, the exhaust channel is an exhaust groove.

[0018] As an optional embodiment, the notch of the exhaust groove is connected to the inlet of the cavity, and the bottom of the exhaust groove extends toward the top wall of the cavity. Gas in the head space of the pump can be discharged into the water outlet channel through the exhaust groove to discharge the gas in the head space.

[0019] As an optional embodiment, the opening size of the exhaust groove gradually increases from top to bottom. Compared to the exhaust groove in which the opening size of the exhaust port gradually decreases or remains unchanged from top to bottom, in this application, the longitudinal cross-sectional area of ​​the exhaust groove is larger in the extension direction of the exhaust groove, and the amount of gas flowing through the exhaust groove per unit time will be greater, which can improve the gas exhaust efficiency and avoid the phenomenon of gas entrapment in the pump chamber to a certain extent.

[0020] As an optional embodiment, the bottom wall of the exhaust groove is a smooth wall surface, which can reduce the frictional force exerted by the bottom wall of the exhaust groove on the airflow and reduce the resistance of the airflow in the exhaust groove.

[0021] As an optional implementation, the bottom of the exhaust groove is located below the cavity top wall.

[0022] As an optional embodiment, the height difference between the bottom of the exhaust groove and the cavity top wall is within 5 mm. By limiting the range of the height difference between the bottom of the exhaust groove and the cavity top wall, even if there is a height difference between the bottom of the exhaust groove and the cavity top wall, it will not affect the gas in the top space from being discharged into the water outlet channel through the exhaust groove.

[0023] As an optional embodiment, the cavity top wall is a plane. When the gas flows in the top space, the resistance encountered by the gas during the flow can be reduced, thereby improving the exhaust efficiency.

[0024] As an optional embodiment, the water pump provided in the present application further includes an impeller and a heating tube arranged in the pump chamber, and the heating tube is located in the middle of the pump chamber in the axial direction of the impeller.

[0025] As an optional embodiment, the cavity sidewall includes two first cavity sidewalls and two second cavity sidewalls, the two first cavity sidewalls are arranged opposite to each other in the axial direction of the impeller, and the two second cavity sidewalls are arranged opposite to each other in the radial direction of the impeller.

[0026] As an optional embodiment, a first cavity side wall is provided with a water inlet, and the exhaust channel is provided at a corner formed by the first cavity side wall having the water inlet and a second cavity side wall connected to the first cavity side wall.

[0027] On the other hand, the present application provides a dishwasher, comprising a water cup, the above-mentioned water pump and a spray arm, wherein the water inlet is connected to the water cup through an inlet pipe, and the water outlet is connected to the spray arm through an outlet pipe.

[0028] As an optional implementation, the water pump is a washing pump.

[0029] As an optional embodiment, the dishwasher provided in the present application further includes a control unit.

[0030] As an optional embodiment, the control unit is configured to control the water pump motor to start and stop a preset number of times after the dishwasher is powered on, so that the gas in the pump chamber flows into the water outlet channel through the exhaust channel.

[0031] In the indoor unit and duct unit provided in the embodiments of the present application, by providing an exhaust channel connecting the top space of the pump chamber and the water outlet channel, the gas accumulated in the top space can be discharged into the water outlet channel through the exhaust channel, and then discharged into the washing chamber through the water outlet, the water outlet pipe and the spray arm in the dishwasher. In this way, the stability of the operating power of the water pump can be improved, and the noise generated by the water pump during operation can be reduced. In addition, it can also avoid a lot of gas adhering to the surface of the heating tube to a certain extent, so as to avoid the phenomenon of dry burning of the heating tube to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic structural diagram of a pump casing in a water pump provided in an embodiment of the present application;

[0033] FIG2 is another schematic structural diagram of a pump casing in a water pump provided in an embodiment of the present application;

[0034] FIG3 is a schematic diagram of the three-dimensional structure of FIG1 ;

[0035] FIG4 is a schematic diagram of the three-dimensional structure of FIG2;

[0036] FIG5 is a cross-sectional view of a dishwasher provided in an embodiment of the present application;

[0037] FIG6 is an enlarged schematic diagram of the local structure at point A in FIG5 ;

[0038] FIG7 is a schematic diagram of the structure of FIG1 in another direction;

[0039] FIG8 is a cross-sectional view taken along line BB of FIG7 ;

[0040] FIG9 is a schematic diagram of the structure of FIG2 in another direction;

[0041] FIG10 is a cross-sectional view taken along the CC direction of FIG9;

[0042] FIG11 is an enlarged schematic diagram of the local structure at D in FIG3 ;

[0043] FIG12 is an enlarged schematic diagram of the local structure at point E in FIG4 .

[0044] Reference numerals:

[0045] 1. Pump housing; 2. Water inlet pipe; 3. Water cup; 4. Water outlet pipe; 5. Washing chamber; 6. Exhaust channel; 7. Exhaust hole; 8. Exhaust slot;

[0046] 11. Pump casing; 12. Water outlet; 13. Connecting part;

[0047] 111, pump chamber; 112, water inlet; 121, water outlet;

[0048] 1111, cavity top wall; 1112, cavity side wall; 1113, first cavity side wall; 1114, second cavity side wall; 1115, top space; 1211, cavity inlet; 1212, water outlet. DETAILED DESCRIPTION

[0049] In the related art, a dishwasher includes a water cup, a washing pump, and a spray arm. The washing pump has a pump housing, which includes a pump housing body and a water outlet. The pump housing body and the water outlet are connected together. The pump housing body is formed with a water inlet and a pump cavity. A water outlet channel is formed in the water outlet. One end of the water outlet channel is formed as an inlet in the cavity, which is connected to the pump cavity. The other end of the water outlet channel forms a water outlet. The water inlet is connected to the water cup through an inlet pipe, and the water outlet is connected to the spray arm through an outlet pipe. There are generally two ways to set the water outlet. One is that the water outlet is set at the top position of the pump housing, and the direction of the water outlet is along the tangent direction of the top of the pump housing. The other is that the water outlet is set on the side of the pump housing, and the inlet in the cavity is set below the top wall of the pump cavity. However, when the water outlet is set in the latter way, air entrapment is likely to occur in the washing pump, which will affect the performance of the washing pump and thus affect the performance of the dishwasher.

[0050] Therefore, this embodiment provides a water pump and a dishwasher, which can solve the problem of air trapping generated by dishwashers in the related art, so as to improve the performance of the dishwasher provided by this embodiment.

[0051] It should be noted that when the water pump provided in this embodiment is applied to a dishwasher, the water pump should be a washing pump, and the above-mentioned water pump can also be applied to electrical products such as dehumidifiers and humidifiers. Here, there is no restriction on the type of water pump applied to other electrical products.

[0052] This embodiment will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] Please refer to Figures 1 to 4. Figure 1 is a structural schematic diagram of a pump casing in a water pump provided in an embodiment of the present application, Figure 2 is another structural schematic diagram of a pump casing in a water pump provided in an embodiment of the present application, Figure 3 is a three-dimensional structural schematic diagram of Figure 1, and Figure 4 is a three-dimensional structural schematic diagram of Figure 2. As shown in Figures 1 to 4, this embodiment provides a water pump, including a pump casing 1, the pump casing 1 includes a pump casing body 11 and a water outlet 12, the pump casing body 11 and the water outlet 12 are connected together, the pump casing body 11 is formed with a pump cavity 111 and a water inlet 112, the water inlet 112 is connected to the pump cavity 111, and a water outlet channel 121 is formed in the water outlet 12, one end of the water outlet channel 121 is formed as an intra-cavity inlet 1211, the intra-cavity inlet 1211 is connected to the pump cavity 111, and the other end of the water outlet channel 121 is formed as a water outlet 1212, and the intra-cavity inlet 1211 is located below the cavity top wall 1111 of the pump cavity 111.

[0054] Please continue to refer to Figures 5 and 6. Figure 5 is a cross-sectional view of a dishwasher provided in an embodiment of the present application, and Figure 6 is an enlarged schematic diagram of the partial structure at point A in Figure 5. In the dishwasher, the water inlet 112 is connected to the water cup 3 through the water inlet pipe 2, and the water outlet 1212 is connected to the spray arm (not shown) through the water outlet pipe 4. To ensure the normal operation of the water pump, an impeller (not shown) is also provided in the pump chamber 111. In the initial stage of executing the washing cycle, water needs to be first filled into the washing chamber 5 of the dishwasher. This stage is the water inlet stage. After the water is injected into the washing chamber 5, it will first gather toward the water cup 3 and enter the pump chamber 111 along the water inlet pipe 2 through the water inlet 112. Under the action of the impeller, the washing water in the pump chamber 111 is pumped out through the water outlet 1212 to the spray arm. The spray arm sprays the washing water onto the tableware placed in the washing chamber 5 to clean the tableware.

[0055] Generally, in order to improve the compactness of the internal structure of the dishwasher, a heating pipe (not shown in the figure) for heating water is set in the pump chamber 111, and the heating pipe is located in the middle of the pump chamber 111 in the axial direction of the impeller, which should be the optimal setting position for the water outlet 12. Therefore, in order to avoid the heating pipe, the water outlet 12 needs to be set at other positions.

[0056] Specifically, the cavity sidewall 1112 includes two first cavity sidewalls 1113 and two second cavity sidewalls 1114. The two first cavity sidewalls 1113 are arranged opposite each other in the axial direction of the impeller, and the two second cavity sidewalls 1114 are arranged opposite each other in the radial direction of the impeller. One of the first cavity sidewalls 1113 is provided with a water inlet 112, and the water outlet 12 is connected to the side of the pump housing body 11 near the water inlet 112. This not only avoids the heating pipe, but also ensures that the water outlet 1212 and the impeller are at an appropriate distance in the impeller axial direction, thereby maintaining good water flow characteristics in the pump cavity 111. Water flow characteristics can include the resistance encountered by water during flow and the flow velocity of the water.

[0057] It is understandable that during the washing process of the dishwasher, that is, during the operation of the water pump, the water entering the pump chamber 111 through the water inlet pipe 2 may carry gas, and due to the flow characteristics of the gas, the gas will accumulate in the top space 1115 of the pump chamber 111. If the gas accumulates in the top space 1115 for a long time, on the one hand, when gas and liquid coexist, the operating power of the water pump will be unstable, which will increase the operating power of the water pump; on the other hand, when gas and liquid coexist, the collision of water with gas during the flow process will generate a lot of noise; and, when more gas rather than water is attached to the surface of the heating tube, it may cause the heating tube to dry burn.

[0058] Please continue to refer to Figures 7 to 10. Figure 7 is a schematic diagram of the structure of Figure 1 from another direction, Figure 8 is a cross-sectional view of Figure 7 along the BB direction, Figure 9 is a schematic diagram of the structure of Figure 2 from another direction, and Figure 10 is a cross-sectional view of Figure 9 along the CC direction. Therefore, in order to avoid the occurrence of the above-mentioned phenomenon to a certain extent, an exhaust channel 6 can be provided. The exhaust channel 6 extends from the pump housing body 11 to the water outlet portion 12. The exhaust channel 6 connects the top space 1115 of the pump chamber 111 and the water outlet channel 121. The gas accumulated in the top space 1115 can be discharged into the water outlet channel 121 through the exhaust channel 6, and then discharged into the washing chamber 5 through the water outlet pipe 4 and the spray arm. This not only improves the stability of the operating power of the water pump, but also reduces the noise generated during the operation of the water pump. In addition, it can also prevent the phenomenon of dry burning of the heating tube to a certain extent.

[0059] The cavity top wall 1111 and the cavity side wall 1112 located at the top define the above-mentioned top space 1115 .

[0060] It should be noted that when the water outlet portion 12 is connected to the side of the pump housing body 11 near the water inlet 112, the exhaust channel 6 is arranged at the corner formed by the first cavity side wall 1113 having the water inlet 112 and the second cavity side wall 1114 connected to the first cavity side wall 1113. In this way, the exhaust channel 6 is provided while the location of the water outlet portion 12 is satisfied, and the gas in the top space 1115 can be discharged into the water outlet channel 121 through the exhaust channel 6.

[0061] To form the aforementioned exhaust passage 6, the pump housing 1 may further include a connecting portion 13, the ends of which are respectively connected to the pump housing body 11 and the water outlet portion 12. The housing wall of the pump housing body 11, the housing wall of the water outlet portion 12, and the connecting portion 13 define the exhaust passage 6. In this way, the aforementioned exhaust passage 6 is formed, and gas in the top space 1115 of the pump chamber 111 can be discharged through the exhaust passage 6 into the water outlet passage 121, and then discharged into the washing chamber 5 through the water outlet 1212, the water outlet pipe 4, and the spray arm.

[0062] It can be understood that when the exhaust channel 6 extends in a direction having a certain angle with the horizontal direction, that is, when the exhaust channel 6 extends in an inclined direction, the path of the gas in the exhaust channel 6 is longer than when the exhaust channel 6 extends in the horizontal direction, thereby prolonging the exhaust time and reducing the exhaust efficiency.

[0063] Therefore, in this embodiment, the horizontal extension of the exhaust passage 6 shortens the path of gas from the top space 1115 to the water outlet passage 121. In other words, the time required for gas in the top space 1115 to be exhausted into the water outlet passage 121 is shortened, thereby accelerating the exhaust rate of gas in the top space 1115. This improves the stability of the water pump's operating power and reduces noise generated during operation. Furthermore, it prevents excessive gas from adhering to the surface of the heating tube, thereby preventing dry heating of the heating tube.

[0064] Since the top space 1115 is enclosed by the chamber top wall 1111 and a portion of the chamber sidewall 1112 at the top, in order for the gas in the top space 1115 to be discharged into the water outlet channel 121 through the exhaust channel 6, the exhaust channel 6 needs to penetrate the chamber sidewall 1112 defining the top space 1115. Specifically, the exhaust channel 6 needs to penetrate the second chamber sidewall 1114 located near the water outlet 12. In this way, the gas in the top space 1115 can be discharged into the water outlet channel 121 through the exhaust channel 6, and then into the washing chamber 5.

[0065] When the exhaust channel 6 passes through the cavity side wall 1112 that defines the top space 1115, that is, the exhaust channel 6 passes through the second cavity side wall 1114, the exhaust channel 6 and the top space 1115 may be directly connected or indirectly connected. When the exhaust channel 6 and the top space 1115 are directly connected, the gas in the top space 1115 will flow directly into the exhaust channel 6, and the gas will not flow over the second cavity side wall 1114; when the exhaust channel 6 and the top space 1115 are indirectly connected, the gas in the top space 1115 will not flow directly into the exhaust channel, that is, the gas in the top space 1115 will first flow through the second cavity side wall 1114 and then flow into the exhaust channel 6. When the gas flows through the second cavity side wall 1114, it will inevitably be affected by the friction force generated by the second cavity side wall 1114, thereby generating a certain resistance to the flow of the gas. Therefore, when the friction force generated by the second cavity side wall 1114 on the gas is small, the resistance of the gas flowing through the second cavity side wall 1114 will be reduced.

[0066] Therefore, in this embodiment, the surface of the second cavity sidewall 1114 is smooth. This reduces friction between the second cavity sidewall 1114 and the gas, even when the exhaust passage 6 and the top space 1115 are indirectly connected. Consequently, the gas experiences less resistance when flowing through the second cavity sidewall 1114. This improves exhaust efficiency and reduces noise generated by the gas flow.

[0067] Please continue to refer to Figure 11, which is an enlarged schematic diagram of the partial structure at point D in Figure 3. In some optional embodiments, the exhaust channel 6 can be a vent 7. That is, one end of the vent 7 penetrates the second chamber sidewall 1114 and communicates with the top space 1115; the other end of the vent 7 penetrates the shell wall of the water outlet portion 12 and communicates with the water outlet channel 121. The gas in the top space 1115 can be discharged into the water outlet channel 121 through the vent 7, and then discharged into the washing chamber 5.

[0068] It is understood that in order to improve exhaust efficiency, the gas in the top space 1115 can be directly discharged into the exhaust hole 7. Therefore, in some specific embodiments, the hole wall of the exhaust hole 7 is connected to the cavity top wall 1111. There is no other transition wall between the wall surface of the cavity top wall 1111 and the hole wall surface of the exhaust hole 7. The gas in the top space 1115 can be quickly discharged into the exhaust hole 7, thereby improving the exhaust efficiency and further avoiding the phenomenon of trapped gas inside the pump chamber 111 to a certain extent.

[0069] It should be noted that when the exhaust channel 6 extends in the horizontal direction, the axial direction of the exhaust hole 7 is also in the horizontal direction. The gas in the top space 1115 can quickly pass through the exhaust hole 7 and flow into the water outlet channel 121.

[0070] Regarding the flow state of the airflow in the exhaust hole 7, in order to further improve the exhaust efficiency, the resistance encountered by the airflow when flowing in the exhaust hole 7 can be reduced. For example, the friction generated between the airflow and the hole wall of the exhaust hole 7 can be reduced.

[0071] Therefore, in some embodiments, the wall of the exhaust hole 7 is a smooth wall, that is, there are neither protrusions nor pits on the wall of the exhaust hole 7, and the friction generated between the airflow and the wall of the exhaust hole 7 is relatively small, thereby reducing the resistance encountered by the airflow when flowing in the exhaust hole 7, thereby improving the gas discharge efficiency and reducing the noise generated by the gas during the flow process.

[0072] Please continue to refer to Figure 12, which is an enlarged schematic diagram of the partial structure at point E in Figure 4. In other optional embodiments, the exhaust channel 6 is an exhaust groove 8, the notch of the exhaust groove 8 is connected to the cavity inlet 1211, and the bottom of the exhaust groove 8 extends toward the cavity top wall 1111, wherein the notch of the exhaust groove 8 is located below the bottom of the exhaust groove 8. Gas in the top space 1115 of the pump cavity 111 can be discharged into the water outlet channel 121 through the exhaust groove 8, thereby exhausting the gas in the top space 1115.

[0073] To improve the gas discharge efficiency, the opening size of the exhaust groove 8 gradually increases from top to bottom. Compared to the exhaust groove 8 having the exhaust opening size gradually decreasing or remaining unchanged from top to bottom, in this embodiment, the longitudinal cross-sectional area of ​​the exhaust groove 8 is larger in the extending direction of the exhaust groove 8, and the gas flow rate through the exhaust groove 8 per unit time is greater, thereby improving the gas discharge efficiency and avoiding the phenomenon of gas entrapment in the pump chamber 111 to a certain extent.

[0074] Furthermore, when the airflow flows in the exhaust groove 8, the airflow is subjected to the friction force exerted by the bottom wall of the exhaust groove 8, thereby increasing the resistance encountered by the airflow during the flow. Therefore, in some embodiments, the bottom wall of the exhaust groove 8 is a smooth wall surface. This reduces the friction force exerted by the bottom wall of the exhaust groove 8 on the airflow, thereby reducing the resistance encountered by the airflow in the exhaust groove 8.

[0075] It should be noted that when the exhaust channel 6 is an exhaust groove 8, due to limitations in the process for creating the exhaust groove 8 itself, the bottom of the exhaust groove 8 may not be at the same height as the cavity top wall 1111. Therefore, in some embodiments, when the bottom of the exhaust groove 8 is located below the cavity top wall 1111, the height difference between the bottom of the exhaust groove 8 and the cavity top wall 1111 is within 5 mm. Although there is a height difference between the bottom of the exhaust groove 8 and the cavity top wall 1111, it does not affect the gas in the top space 1115 from being discharged into the water outlet channel 121 through the exhaust groove 8.

[0076] As the gas in the top space 1115 flows into the exhaust channel 6, it will flow through the cavity top wall 1111. That is to say, the cavity top wall 1111 will generate a friction force on the gas. When the friction force is large, the resistance encountered by the gas during the flow process is large. Therefore, the resistance of the gas flowing in the top space 1115 can be reduced by reducing the friction force generated by the cavity top wall 1111 on the gas.

[0077] Therefore, in some embodiments, the cavity top wall 1111 is a plane. When the gas flows in the top space 1115, the resistance encountered by the gas during the flow can be reduced, thereby improving the exhaust efficiency.

[0078] For example, the cavity top wall 1111 may be a horizontal surface. Here, the shape of the cavity top wall 1111 is not particularly limited.

[0079] This embodiment also provides a dishwasher, including a water cup 3, the water pump and the spray arm in the above embodiment, the water inlet 112 is connected to the water cup 3 through the water inlet pipe 2, and the water outlet 1212 is connected to the spray arm through the water outlet pipe 4.

[0080] The dishwasher provided in this embodiment also includes a control unit, which is configured to control the motor of the washing pump to start and stop a preset number of times after the dishwasher is powered on, so that the gas in the pump chamber 111 flows into the water outlet channel 121 through the exhaust channel 6.

[0081] Specifically, after the start button of the dishwasher is pressed, the control unit first controls the washing pump to start running, continues running for a first time period, and then pauses. When the time period of inactivity reaches a second time period, the control unit controls the water pump to start running again, continues running for the first time period, and then pauses, until the washing pump has been started and stopped a preset number of times. During this process, when the washing pump starts running, the impeller will eject water from the pump chamber 111 upward. After the impeller stops, the ejected water flows back into the pump chamber 111 under the action of gravity, squeezing out the air in the top space 1115 through the exhaust channel 6. After a certain number of back-and-forth flushing, the air in the pump chamber 111 is substantially exhausted. The first time period, the second time period, and the preset number of times can be set and adjusted according to the specific performance of the washing pump.

[0082] After the above-mentioned exhaust operation is completed, the washing program is executed again. Water is first injected into the washing chamber 5 of the dishwasher. This stage is the water inlet stage. After the water is injected into the washing chamber 5, it will first gather toward the water cup 3 and enter the pump chamber 111 through the water inlet 112 along the water inlet pipe 2. Under the rotation of the impeller, the washing water in the pump chamber 111 is pumped out through the water outlet 1212 to the spray arm. The spray arm sprays the washing water onto the tableware placed in the washing chamber 5 to clean the tableware.

Claims

1. A water pump, wherein, Comprising a pump housing, the pump housing including a pump housing main body and a water outlet part connected together; The pump housing main body is formed with a pump chamber and a water inlet communicating with the pump chamber. An outlet passage is formed in the water outlet part. One end of the outlet passage is formed as an in-chamber inlet communicating with the pump chamber, and the other end of the outlet passage is formed as a water outlet. And the in-chamber inlet is located below the top wall of the pump chamber; The pump housing is further provided with an exhaust passage extending from the pump housing main body to the water outlet part, and the exhaust passage communicates the top space of the pump chamber and the outlet passage.

2. The water pump according to claim 1, wherein, The pump housing further includes a connecting part, and two ends of the connecting part are respectively connected to the pump housing main body and the water outlet part; The housing wall of the pump housing main body, the housing wall of the water outlet part and the connecting part define the exhaust passage therebetween.

3. The water pump according to claim 1, wherein, The exhaust passage extends in a horizontal direction.

4. The water pump according to any one of claims 1 to 3, wherein, The chamber wall of the pump chamber further includes a chamber side wall connected to the periphery of the top wall of the chamber; The top wall of the chamber and the chamber side wall at the top define the top space, and the exhaust passage penetrates through the chamber side wall defining the top space.

5. The water pump according to claim 4, wherein, The wall surface of the chamber side wall defining the top space is a smooth wall surface.

6. The water pump according to claim 4 or 5, wherein The exhaust passage is an exhaust hole.

7. The water pump according to claim 6, wherein, The hole wall of the exhaust hole is connected to the top wall of the chamber.

8. The water pump according to claim 6, wherein, The hole wall of the exhaust hole is a smooth wall surface.

9. The water pump according to any one of claims 4 to 8, wherein, The exhaust passage is an exhaust groove, the notch of the exhaust groove communicates with the in-chamber inlet, and the bottom of the exhaust groove extends towards the top wall of the chamber.

10. The water pump according to claim 9, wherein, In the direction from top to bottom, the opening size of the exhaust groove gradually increases.

11. The water pump according to claim 9, wherein, The bottom wall of the exhaust groove is a smooth wall surface.

12. The water pump according to claim 9, wherein, The bottom of the exhaust groove is located below the top wall of the chamber, and the height difference between the bottom of the exhaust groove and the top wall of the chamber is within 5 millimeters.

13. The water pump according to any one of claims 4 to 12, wherein, The top wall of the chamber is a plane.

14. The water pump according to any one of claims 4 to 13, wherein, Further including an impeller and a heating tube disposed in the pump chamber, and the heating tube is located at the middle position of the pump chamber in the axial direction of the impeller; The chamber side wall includes two first chamber side walls oppositely disposed in the axial direction of the impeller and two second chamber side walls oppositely disposed in the radial direction of the impeller; Wherein, one of the first chamber side walls is provided with the water inlet, and the exhaust passage is disposed at the corner formed by the first chamber side wall having the water inlet and the second chamber side wall connected to the first chamber side wall.

15. A dishwasher, wherein, Comprising a water cup, the water pump according to any one of claims 1 to 14, and a spray arm. The water inlet is communicated with the water cup through a water inlet pipe, and the water outlet is communicated with the spray arm through a water outlet pipe.

16. The dishwasher according to claim 15, wherein, Further including a control unit, and the control unit is configured to, after the dishwasher is powered on, control the motor of the water pump to perform a preset number of start-up operations and stop operations, so that the gas in the pump chamber flows into the outlet passage through the exhaust passage.

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