KR100685980B1 - Drainage pump euro casing of washing machine - Google Patents

Abstract

The present invention relates to a drainage pump casing of a washing machine, and more particularly, to pumping performance in all drainage strokes from initial drainage to dewatering by changing the position between the drainage pump hose, the pump casing, and the pump impeller in a forced drainage type using a centrifugal pump. To improve.

The configuration of the present invention has a hose for guiding the water drained from the washing tank to the drain pump side, and an inlet portion for receiving the water flowing out through the hose, the water flow space and the pump casing equipped with an impeller in the flow space In the drain pump casing of the washing machine, the drain pump flow passage casing has an arbitrary flow path angle at which an inlet portion of the pump casing connected with a hose which is a drain path between the washing tank and the drain pump induces the flow of water into the water flow space in the pump casing. This flow path angle is set based on the high level of the water flow space in the pump casing so that the water passing through the hose fills the pump casing flow space. Accordingly, the flow path of the pump casing is filled with water, so the cavitation phenomenon does not appear in the drain pump driving.

Description

Drainage pump euro casing of washing machine

The present invention relates to a drain pump flow casing of a washing machine, and more particularly, to pumping in all drainage strokes from initial drainage to dewatering through a change in position between a drain pump hose, a pump casing, and a pump impeller in a forced drainage type using a centrifugal pump. It is to improve performance.

In the natural drainage type drainage system of the washing machine, as shown in FIG. 1, a drain connector 3 is formed below the washing tank 2, and one side of the hose 4 is connected to the drain connector 3 by using a hose 4. The other side of the hose 4 is connected to the drain pipe 5 inserted into the outer case 1 so that water flowing from the washing tank 2 is discharged to the outside along the hose 4 to the outside. The drainage passage is provided with an electronic drainage valve 6 to open or block the drainage passage in accordance with a control signal of the drainage valve 6 of the microcomputer during the entire driving operation of the washing machine.

The control system detects the water level in the washing tank 2, a microcomputer for controlling the overall stroke of the washing machine, a drain valve driving unit for driving the drain valve 6 drained from the washing tank 2 by the control signal of the microcomputer. Water level detection unit for transmitting to the microcomputer, a motor driving unit for receiving the control signal from the microcomputer to rotate the induction motor 7, and detecting an unbalanced or door on / open state and transmitting an electrical signal to the microcomputer. Mechanically linked with the safety switch and the drain valve 6, the power of the motor 7 is transmitted only to the pulsator when the drain valve 6 is turned off, and the pulsator and inner tub are energized when the drain valve 6 is turned on. It consists of a clutch 8 which transmits simultaneously. When the washing machine control system sends a control signal from the microcomputer to the motor drive unit, dehydration starts while the induction motor is rotatable. When the dehydration time is set, it is checked by the control signal of the microcomputer to turn on the drain valve 6 and drain the water from the washing tank 2 while checking whether the water level is from the water level detection unit. When the airborne level is reached, time is initialized and intermittent dehydration corresponding to balance dehydration is performed while turning on / off the induction motor for several seconds.

After the intermittent dehydration time elapses, the induction motor is continuously turned on to rotate the motor speed at high speed to proceed with the main dehydration. This process continues, and when the dehydration is completed, the induction motor 7 and the drain valve 6 are turned off and the dehydration process is completed.

In this way, water in the washing tank 2 is drained by the control of the drain valve 6 during the washing stroke, which is similar to the natural drainage from the water drainage type. This is the type of drainage of most household washing machines, which has a microcomputer controllable valve in the washing tank for draining the water so that the water flows to the lower area lower than the washing tank 2 so as to flow directly into the sewer. .

Figure 2 shows a forced up-down drainage device, which is equipped with a separate drainage centrifugal pump as a drainage component to force the water in the washing tank.

The drainage type to which the drainage pump 10 is applied differs from the drainage type in which water is naturally drained under the control of the drainage valve 6. That is, it is applied to a condition in which natural drainage is impossible, for example, a drainage destination has to select a drainage direction in a distance or upward direction. Therefore, compared with the natural drainage type drainage system which performs drainage by the control of the drain valve 6, the drain valve 6 opening / closing timing and the drain pump 10 driving timing are approximately the same (actually, there may be a difference). It can be seen that there is no difference in the drainage time, and because the pumping force drains the water in the washing tank 2, the pumping force of the drainage pump 10 varies the amount of water drainage, and the difference affecting the dehydration performance especially in intermittent dehydration. have.

In intermittent dehydration, induction motors intermittently turn on / off operation to correct entanglement or straining, dehydrate water that has soaked in the cloth, and then spin the washing tank for a fixed period of time to complete dehydration. In particular, in the case of intermittent dehydration, the driving timing of the drain pump 10 is determined by adjusting the drainage timing to the water generated when the induction motor is driven, and the water in the washing tank 2 is set to drain every time.

Assuming this condition, it is considered that the water is forcedly drained by adjusting the pumping force of the drainage pump 10 by considering the variation in the amount of water according to the amount of laundry and estimating the amount of water generated in the dehydration stroke. However, the amount of drained water is so variable that it may differ from the actual pumping pressure, which is likely to be a delayed drainage of the water in the drainage stage, which is greater in intermittent dewatering than main draining.

This point was introduced in Korean Patent Application Publication No. 97-27437, "Method for Controlling Drainage Pump for Intermittent Washing of Washer," which is proposed to facilitate drainage. It is to promote and is not related to the self pumping performance of the drain pump.

On the other hand, the pumping performance of the drain pump 10 is not only the performance of the pump itself but also the length and cross-sectional area of the drainage channel and the shape of the impeller carrying the fluid.

However, in the conventional drainage apparatus as shown in FIG. 2, a cavitation phenomenon that lowers the pumping performance of the drainage pump 10 occurs in the initial driving or every repetitive section of the intermittent dehydration, which is a difference in water drainage path and pump impeller. Formed structurally.

That is, in the drainage device, a drain connector 3 is formed on the lower side of the washing tank 2, and the drain pump 10 is coupled to the drain connector 3 through a hose 4. Outside of 10), the drain pipe 5 is connected.

The drain pump (10) is coupled to the drain connector (3) and is joined to a hose (4) to extend the flow path to guide the natural flow to guide the water through the hose (4) into the drain pump (10) A pump casing 11 providing a flow space 9 through which the water flows, and an impeller 12 pumping water flowing in the pump casing 11 to form a forced flow toward the drain pipe 5. In addition, the pump casing 11 has an inlet portion 13 for receiving water via the hose 4, and has a flow space 9 and a discharge port 14 that are larger than its diameter.

And in the flow path of the washing tank 2, the hose 4, the pump casing 11, first, the coupling portion of the drain connector 3 and the hose 4 is parallel to the y-axis in the vertical direction. Second, the hose 4 and the inlet 13 of the pump casing 11 are parallel to the x-axis in the horizontal direction. Third, the fluid flow space 9 formed in the pump casing 11 has a size larger than the fluid movement cross-sectional area of the inlet portion 13.

The cause of the cavitation is the water entering the pump casing 11 along the flow path of the inlet 13 of the pump casing among the flow paths of the washing tank 2, the hose 4, and the pump casing 11 as described above. This is caused by the inability to fill the upper space of the flow space 9 and the air gap G remaining in the flow space 9, where a large amount of water flows into the pump casing 11 instantaneously along the hose 4 The possibility of forming the air gap G in (9) is reduced, but in a stroke such as intermittent dehydration which repeats driving and rest, the flow of water after the pumping of the water drainage proceeds to a small amount of low water level. The likelihood of formation is high, which sometimes occurs in the initial start-up phase for drainage and in intermittent dewatering appears at every intermittent drive of the drain pump 10.

Such a conventional drainage device causes a cavitation phenomenon in the driving of the impeller, which results in the loss of fluid flow of the impeller, which lowers the pumping performance and increases the pumping power, thereby affecting the driving efficiency of the motor. It develops into abnormal noise and causes a disturbance in quiet operation.

In addition, there is a problem that the available pumping force is lowered by the fluid flow loss in intermittent dewatering than the actual drainage pump work, thereby lowering the dewatering performance.

These problems are mainly found in the pump casing of the drain pump, but since the installation conditions of the drain pump are installed in extremely limited conditions inside the washing machine casing, it is difficult to apply the method of removing the air gap in the pump casing by changing the drain flow channel.

Therefore, an object of the present invention is to prevent the cavitation phenomenon in the drain pump by eliminating the air gap represented by the drain pump casing flow path of the washing machine.

Another object of the present invention is to constantly maintain the dehydration performance of the drain pump without changing the performance of the drain pump applied to the forced drain type washing machine.

The present invention is a washing machine comprising a hose for guiding the water drained from the washing tank to the drain pump side, and an inlet for receiving the water flowing out through the hose, and a flow space of the water and a pump casing equipped with an impeller in the flow space. In the drain pump casing of;

The drain pump euro casing,

The inlet portion of the pump casing, which is connected to the hose, which is the drainage path between the washing tank and the drain pump, has an arbitrary flow path angle for directing the flow of water into the water flow space in the pump casing, which flows into the high water level region of the water flow space in the pump casing. By setting the standard, water passing through the hose fills the pump casing flow space.

Optionally, the pump casing inlet is formed with an upward slope that gives a drop in the flow of water so that the flow space of the pump casing is filled in the condition that the inlet flow path is full.

Optionally, the flow path angle between the washing tank and the drain pump is characterized in that it overflows when the volume given to the pump casing is filled.

Optionally, a flexible non-linear margin is provided in the hose connecting the wash tub and the pump casing inlet.

Optionally, the drainage passage is characterized by forming one bend given to the hose consisting of the nonlinear portion and the other bend formed by an arbitrary angle θ of the pump casing inlet.

The drainage pump casing of the washing machine connects the hose to the washing tank and induces the flow of water into the flow space of the pump casing in the process of directing the drained water to the drainage pump side to block the inflow of air into the flow space to drain the pump. This function prevents the cavitation phenomenon that occurs during operation.

An embodiment of the present invention will be described with reference to the drawings.

Figure 4 is a drainage passage structure in the flow passage casing of the drainage pump to which the present invention is applied, Figure 5 shows the area of the drainage passage.

One end of the hose 4A is connected to the drain connector 3 for draining the water in the washing tank 2, and the other end is coupled to the inlet portion 13A of the pump casing 11A, and the washing tank 2 and the drain pump A drainage flow path between the 10A and the drainage pump 10A includes a pump casing 11A, an inlet 13A, and a flow space 9A connected to the inlet 13A, an outlet 14, and an impeller 12. It constitutes a common drainage channel consisting of.

The inlet portion 13A for introducing water into the pump casing 11A has a flow path angle at which an arbitrary inclination θ is given based on the horizontal x-axis, and the flow path of the inlet portion 13A is at full water level. 11A) was set based on the point of filling the flow space (9A), the flow path angle of the inlet portion (13A) is formed with an upward slope to give a drop in the flow of water to pump in the condition that the inlet (13A) flow path is full water level The flow space 9A of the casing 11A was naturally filled.

The hose 4A connecting the washing tank 2 and the inlet portion 13A of the pump casing 11A is connected to the inlet portion 13A in a straight line connection without a linear coupling to give a stretch margin. It is to apply flexible hose. This is represented by one bend "a" given to the hose 4A of which the entire drainage flow path is a non-linear part, and another bend "b" made by the angle [theta] of the pump casing inlet 13A.

The drainage flow path of the washing machine drainage pump configured as described above is filled with water in the air gap space of the pump casing in the initial stage of drainage or in the drainage stage from intermittent dehydration or intermittent dehydration to main dehydration. The specific action is as follows.

In the dehydration operation of the forced drain type washing machine, when the intermittent dewatering, the drain pump 10A repeats the on / off operation in accordance with the dehydration time and drains the water in the washing tank 2 with the hose 4A-pump casing inlet 13A. Drain through the impeller 12-the pump casing discharge port 14-the drain pipe 5.

Looking at the subsequent path of the water flowing into the pump casing inlet (13A) has a path to obtain the centrifugal force of the impeller 12 in the pump casing flow space (9A) to be sent to the discharge port (14) and discharged to the drain pipe (5).

Therefore, when the flow rate and the flow rate are constant, the drainage amount appears constant in proportion to the work amount of the impeller 12, but if there is a flow rate and the flow rate fluctuations, the drainage rate changes regardless of the work amount of the impeller 12.

The portion of the drain pump casing that can vary the flow rate is the flow space 9A of the pump casing 11A. This part is a space which transmits the centrifugal force of the impeller 12 to a fluid, and the water drained from the washing tank 2 necessarily passes through this space. In the conventional pump casing, when the flow rate of the water is sharply reversed, the upper portion is left as an empty space, and thus appears as a cavitation phenomenon when the impeller is driven. If the flow space 9A of the pump casing 11A is always filled with water, the empty space will disappear and no phenomenon such as bubble generation during driving of the impeller will appear.

The pump casing of the present invention allows the flow space 9A to be filled when only a certain amount of drainage flow rate from the washing tank 2 passes through the hose 4A. That is, the shape of the inlet portion 13A which receives the water passing through the hose 4A has an arbitrary inclination θ which collects the water into the flow space 9A, and positionally of the pump casing 11A. By creating a flow path at a point parallel to or at least exceeding the high-level "HL" line of the upper portion of the flow space 9A, if only the drainage air flow rate is provided at any time such as initial drainage, intermittent dehydration, and main dewatering, the flow space 9A is exceeded. The composition is formed in an overflow state.

This creates the condition that water is filled in the flow space 9A during the initial driving stage of the impeller, and thus the initial flow shortage affecting the drainage or the cavitation during the driving of the impeller 12 is suppressed. The pumping performance of draining the water generated by each washing tank 2 with sufficient pumping power improves the dewatering performance in relation to the optimum drainage of water, and maintains a constant work rate of the impeller 12 without lowering the pumping power caused by the cavitation phenomenon. It appears to act to preserve the pumping performance given to the drain pump (10A).

The hose 4A, which connects the washing tub 2 and the drain pump 10A to form a drainage flow path, is a flexible hose, and is treated non-linearly to give the hose 4A a stretch margin. This provides fluidity to the hose 4A against free movement such as limited rotation or linear movement of the washing tub 2 in the washing stroke, thereby preventing the free movement of the washing tub 2 by the drainage flow path.

As described above, the present invention shows a relatively simple type of drainage flow path in which the water supply direction to the drainage pump is changed upward. However, some of the following matters are not limited to the inlet 13A model of the pump casing. Note that it is not provided by a simple change of location.

The present invention contemplates the following limited conditions.

The position of the drain pumps 10 and 10A in the washing machine casing 1 is determined in the lower side than the washing tank 2 in consideration of the drop movement of the water and the connection of the drain pipe 5.

Since the vertical spacing between the washing tank 2 and the lower frame 15 affects the power efficiency between the drive system and the overall product size, the gap is formed as short as possible, so the position of the drain pumps 10 and 10A is naturally the washing tank 2. By placing it in the gap between the frame and the underframe, the positional freedom of installation is extremely low.

Therefore, in order to control the path of the drainage flow path causing the cavitation phenomenon, it is possible to approach the method of making the drainage flow path on the drainage pumps 10 and 10A, but there is no position control margin of the drainage pump in the entire casing 1. When the pump casing inlet (13) (13A) is placed in the upper position and the hose (4) (4A) is treated in a nonlinear manner, the natural flow of water from the washing tank (2) into the drain pump (10) (10A) is maintained. It is difficult to do and requires more pumping power so there is no comparative advantage.

In addition, there is also a method of setting the inlet angle of the water in the vertical direction by shortening the length of the hose (4) (4A), this method results in restraining the free movement of the washing tank (2) during dehydration administration.

As described above, the present invention takes the form of a relatively simple drainage flow path in which the drainage flow path between the washing tank and the drainage pump is designed by adjusting the water supply direction to the drainage pump upward, but without design changes in a limited washing machine casing. The water inflow angle of the drain channel was adjusted by applying various drain channel criteria considering the installation space of drain pump, characteristics of drain channel, and pumping performance of drain pump.

The present invention eliminates the air gap in the pre-pumping stage by the shape of the drain pump casing flow path of the forced drain type washing machine to prevent the cavitation phenomenon in the drainage pump driving to improve the pumping performance and at the same time reduce the water shock noise to help the quiet operation of the washing machine Can give

In addition, the present invention is effective to improve the dewatering performance of the performance appearing in connection with the pumping of the drainage pump by maintaining the pumping performance constant in each drainage stroke without changing the performance of the drainage pump applied to the forced drainage washing machine.

1 is a schematic diagram of a drainage system of a washing machine.

Figure 2 is a configuration of a conventional washing machine drain pump flow path casing.

3 is a view for explaining the flow of water in FIG.

Figure 4 is a configuration of the washing machine drain pump flow path casing of the present invention.

5 is a view for explaining the flow of water in FIG.

*** Explanation of symbols for the main parts of the drawing ***

2: washing tank 3: drain connector

4.4A: Hose 5: Drain Pipe

9.9 A: fluid space 10.10 A: drainage pump

11.11A: Pump casing 12: Impeller

13.13A: Entrance 14: Discharge outlet

15: lower frame

Claims (2)

In the drain pump casing of the washing machine comprising a hose for guiding the water drained from the washing tank to the drain pump side, and an inlet portion for receiving the water flowing out through the hose, and a pump casing with an impeller in the flow space of the water. In; The drain pump euro casing, An inlet portion of the pump casing connected to the hose, which is a drainage path between the washing tank and the drainage pump, has a flow path angle at which an inclination is given along the horizontal axis to induce the flow of water into the water flow space in the pump casing. An inlet for introducing water into the pump casing is one end is fastened to a level above the full water level of the pump casing, the other end is positioned above the one end is inclined so that the water flows from one end to the other end, The fastening position of the inlet portion is set based on the point of filling the flow space of the pump casing when the water level is full, Lean stretchable non-linear margin in the hose connecting the washing tank and the pump casing inlet, The hose between the washing tank and the drain pump is positioned so that the water overflowed from the pump casing in a portion of the hose when the pump casing becomes full water level, the drain pump flow path casing of the washing machine. The method of claim 1, Drainage pump flow casing of the washing machine characterized in that between the washing tank and the drain pump is provided with a drain passage consisting of one bent portion given to the hose made of a non-linear portion and the other bent portion formed by the angle of the pump casing inlet.