Abstract: An open water pump comprises an upper casing, a lower casing, an impeller having a central shaft and a plurality of blades. Each blade has an upper portion and a lower portion. The upper casing has an upper chamber, the lower casing has a lower chamber. A plurality of inlets attached below and to a side of the lower casing, and a plurality of outlets attached to a side of the upper casing. At least the bottom portion of the lower portion of each blade which attached to the shaft gradually bends along a rotation direction of the impeller, and a ratio of a height of the lower portion of each blade to a height of the upper portion is between 1 and 5. The impeller can be allowed to draw water at a low water level, foam formed by washing liquid or food debris on the surface of water can be less likely to get into the impeller to influence the drawing of water, a sufficient amount of water can be drawn from the water inlets.

Abstract: A sink-type washing machine comprises a case having a sink body; the sink body has a recess at least at the center of the bottom portion; a drain board having a same shape as the recess which is covered on the recess; the drain board has a plurality of drain holes; the recess under the drain board defines into a drain region; the surface of the drain board is flush with the bottom portion of the sink body around the drain board; the water pump is disposed in the drain region for pumping the water in the drain region to above the drain board. By having the water pump arranged in the drain region of the sink body, the water pump is provided with a great water replenishment effect, arrangement of a water outlet component is facilitated, and an improved spraying effect can be acquired.

Abstract: A sink-type washing machine includes a case, a drain board, a water pump and a rotary spray arm; the case includes a sink body and a cover plate; the sink body has a recess which forms a drain region, the water pump is inside the drain region, the drain board covers the drain region, the rotary spray arm is above the drain board, water outlets being in communication with the flow channel in the water pump so that water in the drain region can be sprayed into the washing space and above the drain region. A drain board covers the drain region and a water pump is disposed inside the drain region, the water pump is isolated from the washing region by the drain board, so that the water flowing back to the water pump is firstly filtered by the drain board.

Abstract: A rotary spray arm for a washing device and a washing device, the rotary spray arm comprises a pair of an upper cover and a lower cover attached to the upper cover; a flow channel disposed between the upper cover and the lower cover, the water outlets are disposed on the upper cover; an upper chamber in communication with the flow channel is formed at a center of the lower cover; the flow channel is located at two sides of the upper chamber, and a hole matching to the upper chamber is formed on a bottom surface of the lower cover. The rotary spray arm is provided with a chamber for accommodating the water outlet portion of the water pump and the chamber is communicated to the water outlets, therefore, the rotary spray arm can be manufactured independently of the water pump, and both processing and mounting are very convenient.

Abstract: A sink-type washing machine includes a case, a drain board, a water pump and a rotary spray arm; the case includes a sink body and a cover plate; the sink body has a recess which forms a drain region, the water pump is inside the drain region, the drain board covers the drain region, the rotary spray arm is above the drain board, water outlets being in communication with the flow channel in the water pump, so that water in the drain region can be sprayed into the washing space and above the drain region. A drain board covers the drain region and a water pump is disposed inside the drain region, the water pump is isolated from the washing region by the drain board, so that the water flowing back to the water pump is firstly filtered by the drain board.

Abstract: A rotary spray arm for a washing device and a washing device, the rotary spray arm comprises a pair of an upper cover and a lower cover attached to the upper cover; a flow channel disposed between the upper cover and the lower cover, the water outlets are disposed on the upper cover an upper chamber in communication with the flow channel is formed at a center of the lower cover; the flow channel is located at two sides of the upper chamber, and a hole matching to the upper chamber is formed on a bottom surface of the lower cover. The rotary spray arm is provided with a chamber for accommodating the water outlet portion of the water pump and the chamber is communicated to the water outlets, therefore, the rotary spray arm can be manufactured independently of the water pump, and both processing and mounting are very convenient.

Abstract: A sink-type washing machine comprises a case having a sink body; the sink body has a recess at least at the center of the bottom portion; a drain board having a same shape as the recess which is covered on the recess; the drain board has a plurality of drain holes; the recess under the drain board defines into a drain region; the surface of the drain board is flush with the bottom portion of the sink body around the drain board; the water pump is disposed in the drain region for pumping the water in the drain region to above the drain board. By having the water pump arranged in the drain region of the sink body, the water pump is provided with a great water replenishment effect, arrangement of a water outlet component is facilitated, and an improved spraying effect can be acquired.

Abstract: An open water pump comprises an upper casing, a lower casing, an impeller having a central shaft and a plurality of blades. Each blade has an upper portion and a lower portion. The upper casing has an upper chamber, the lower casing has a lower chamber. A plurality of inlets attached below and to a side of the lower casing, and a plurality of outlets attached to a side of the upper casing. At least the bottom portion of the lower portion of each blade which attached to the shaft gradually bends along a rotation direction of the impeller, and a ratio of a height of the lower portion of each blade to a height of the upper portion is between 1 and 5. The impeller can be allowed to draw water at a low water level, foam formed by washing liquid or food debris on the surface of water can be less likely to get into the impeller to influence the drawing of water, a sufficient amount of water can be drawn from the water inlets.