GB2432594A

GB2432594A - Ballast system for a washing machine

Info

Publication number: GB2432594A
Application number: GB0613782A
Authority: GB
Inventors: Andrew Martin Reason; Mario Rabaiotti
Original assignee: Andrew Reason Ltd
Current assignee: Andrew Reason Ltd
Priority date: 2005-11-25
Filing date: 2006-07-12
Publication date: 2007-05-30
Also published as: GB0523978D0; GB0613782D0

Abstract

The system includes a reservoir 110 with means to permit water flow between the reservoir and a washing machine drum 130. The reservoir includes a water inlet, a water outlet and means to fill the reservoir and maintain it full between washing cycles. The weight of the reservoir acts to counter balance vibrations generated by rotation of the drum during a washing cycle. A pumping means may pump water between the reservoir and the drum. A heater 120 may be provided in the flow path between the reservoir and the drum or the reservoir may contain the heater. An alternative laundry appliance with ballast system includes transport members extending from its base and mounted via compressible means.

Description

Water Supply for Laundry Appliances The present invention relates

generally to laundry appliances and more specifically to a means for supplying water for use in a wash cycle of a laundry appliance.

In general, when a wash cycle is initiated in a washing machine, cold water is drawn into the rotational drum and heated therein to the required temperature prior to commencing the wash cycle. Hot, dirty water that has been used during the wash cycle is then drained out of the drum, to be replaced by a further quantity of cold water from the mains supply. Not only is this process wasteful of water, but it also requires a significant amount of energy to heat the very cold water being pumped directly from the mains supply in respect of eveiy wash cycle.

Furthermore, because the cold water is heated in the drum (with the laundry) the choice of heating means is limited to means that can be provided in the drum and can be used in close proximity to the laundry without damage to either the laundry or the heating means. Thus, it has not always been possible to use the most energy efficient water heating means in conventional laundry appliances.

It is an object of the present invention to provide a water supply system for a laundry appliance which overcomes at least some of the problems outlined above, and can significantly improve the energy efficiency of a laundry appliance relative to the prior art.

In accordance with the present invention there is provided a water supply system for a washing machine having a rotational drum for receiving laundry, the water supply system comprising a reservoir having means for permitting water to flow between said reservoir and said drum, the reservoir further comprising an inlet for enabling said reservoir to be filled with water and an outlet for enabling water to be drained from said reservoir, the system further comprising means for filling said reservoir and maintaining said reservoir substantially full of water between washing cycles of said washing machine, and means for transferring water from said reservoir into said drum for use in a wash cycle.

Thus the above-mentioned object is achieved by providing a reservoir, separate from the washing machine drum, that is filled with cold water (from the mains supply) between wash cycles. The water, which is held in the reservoir between washes will often have time to be heated to a temperature approaching the ambient temperature of the surroundings, so that it requires less energy to heat the water up to the correct temperature for the selected wash cycle.

In one exemplary embodiment, means may be provided for delaying commencement of a wash cycle until the water in the reservoir is at least a predetermined temperature. Preferably, heating means are provided for heating the water in the reservoir prior to transfer thereof to said drum. Because the water is heated in the reservoir and not in the drum, any energy efficient heating means can be used, e.g. microwave heating means. Such heating means may be provided in the flow path between said reservoir and said washing machine drum, or said reservoir may contain heating means, to heat water held therein. In the latter case, said reservoir may be divided into a plurality of sub-reservoirs, wherein one or more of said sub-reservoirs beneficially contain a heating means to heat water held therein.

Beneficially, pumping means are provided for pumping water between said reservoir and the drum of said washing machine.

In a preferred embodiment, the weight of the reservoir when it is substantially full of water acts to counter balance vibrations generated by rotation of said drum during a wash cycle.

Thus, the water supply system can conveniently double up as a ballast system for the washing machine. The water supply system is beneficially controlled by the control program of the washing machine.

Beneficially, the reservoir is mounted on or adjacent the outer wall of said drum, such that heat from the water therein during the wash cycle is transferred to the water in the reservoir, to aid in raising the temperature thereof.

The present invention extends to a washing machine having a drum and a water supply system as defined above.

The present invention further extends to a laundry appliance having a rotatable drum and a ballast system comprising a reservoir having an inlet for enabling said reservoir to be filled with water such that the weight thereof acts to counter-balance vibrations generated by rotation of said drum during a laundry cycle and an outlet to enable water to be drained from said reservoir, said laundry appliance further comprising transport members extending from the base thereof and resting on a support swface when said reservoir is empty, said transport members being mounted via compressible means relative to respective recesses in said base of said laundry appliance such that when said reservoir is filled with water, the weight thereof acts to compress said compressible means and cause said base of said laundry appliance to be lowered towards said support surface such that at least said compressible means enters said respective recesses and the base of said laundry appliance rests on said support surface.

Thus, by mounting a washing machine on a set of selectively contractible and extendable transport members, such as rollers, the rollers will protrude from the base of the machine when the weight of the ballast is below that required to counter-balance the rotation of the drum, in use, thereby allowing the machine to be moved easily on the rollers. When the weight of the ballast is mcreased to counterbalance rotation of the drum during use, a large downward force is created in respect of the washing machine, and the machine is lowered towards the ground, for stability during use. The washing machine is pushed down over the rollers so that they are retracted into respective recesses in the base of the machine.

Beneficially, said roller means comprises at least one castor wheel, and more preferably a plurality of castor wheels.

Preferably, said compressible means comprises at least one spring.

Beneficially, a set of pads or the like are provided on the base of the machine o increase friction between said machine and said support surface.

These and other aspects of the present invention will be apparent fIom, and elucidated with reference to, the embodiments described herein.

Embodiments of the present will now be described, with reference to the accompanying drawing, in which: Figure 1 is a perspective view of a drum and ballast tank of a washing machine according to a first exemplary embodiment of the present invention; Figure 2 is a schematic diagram ofa divided ballast chamber according to a second exemplary embodiment of the present invention; and Figures 3a and 3b are schematic diagrams illustrating a set of spring-loaded castor wheels that operate in relation to the ballast tanks in an exemplary embodiment of the present invention.

Referring to Figure 1 of the drawings, a washing machine according to an exemplary embodiment of the present invention comprises a drum 130 anchored to a base 150 via four separate damping means. As the drum 130 is actuated round its axis of rotation 200 it causes lateral vibrations that would, if anchored to the base 150 alone, cause the washing machine to fall over. A heater unit 120 is provided under the drum 130 for heating cold water for use during a wash cycle. Ballasting means 110 are provided comprising one or more interconnected hollow containers of a strong yet light material, such as a high density polymer.

The ballasting means 110 is connected to the cold water source at its inlet point and further connected to the drum at its outlet point, such that cold water enters via the inlet, fills the ballasting means 110 to a desirable level and may further overflow into the drum itself or be pumped there. There is a facility for the outlet of the ballasting means 110 to pass directly to the heater 120 prior to entering the drum 130, or alternatively the heater 120 may be provided within the ballasting means 110.

The heater unit 120 could comprise standard resistance elements, or possibly microwave heating means.

Referring now to Figure 2, a divided ballast tank according to a further exemplary embodiment of the present invention comprises a ballast tank 202 divided into three chambers 202a, 202b, 202c, each chamber being separate from one another, with the exception of a valve 208 that provides a connection between adjacent chambers. Each chamber 202a, 202b, 202c has an independent energy source 204a, 204b, 204c as well as an outlet pipe 206a, 206b, 206c through which water may pass to the drum. There is also provided a water input means 212a, 212b, 212c to each chamber 202a, 202b, 202c, so that cold water from the mains can be introduced to the chambers. Alternatively, there could be one water input per cluster of three chambers 202a, 202b, 202c and the internal valves 208 could be used to distribute the water therebetween. In this embodiment, the water contained in each chamber 202a, 202b, 202c can be heated independently from one another, such that if a wash cycle is chosen by a user that only requires a small quantity of water, a single chamber, say 202a, could be heated and pumped (not shown) to the drum by way of the outlet pipe 206a, rather than heating an equivalent chamber three times its volume and then only using a third of it. The programming system 210 of the washing machine controls when the energy sources 204a, 204b, 204c are turned on and off as well as the outlet functions 206a, 206b, 206c, in relation to a chosen input by a user. This presents obvious energy saving benefits as only the water required for an imminent wash is heated, thereby saving the energy necessary to heat the unused water.

The internal valves 208 help to maintain the stability of the machine by letting water flow between the ballast chambers 202a, 202b, 202c, such that there is no uneven weight distribution that could cause the machine to fall over as it operates. Ensuring the tanks are symmetrically drawn down also helps in this regard.

The chambers 202a, 202b, 202c may be of equal size or may be provided in different sizes to suit different wash cycles chosen by the user.

Referring now to Figure 3, in a further aspect of the present invention a set of four spring-loaded castor wheel arrangements are incorporated into the base of the washing machine body 302, being arranged with one in each corner. The spring loaded castor wheel arrangements each comprise a castor wheel 304, the top end of which is connected to a strong compressible spring 306 that sits within, and may be fixed to, the top inner face of a substantially vertical hole, recessed in the base of the washing machine body 302. Castor wheels are stated by way of example and may be replaced by any transport means that are not directionally fixed, to increase the manoeuverability of the washing machine.

The strength of each spring is such that when the ballast of the machine is empty the castor wheels 304 protrude from the base of the washing machine body 302 and are in communication with the floor 308, allowing the machine to be easily movable across the floor 308 (as shown in Figure 3a). When the ballast within the machine is filled with liquid, the extra weight compresses the springs 306 such that the machine drops downwardly towards the floor 308 and engages the floor 308 with four protruding rubber studs 310 (see Figure 3b).

Although springs 306 are stated for use in the system, it should be noted that any means that provides a similar action may be used alternatively or in combination. A set of rubber, (or any material with a reasonable coefficient of friction), studs 310 are provided on the base of the machine, to provide friction that opposes any lateral movement generated when the machine is in use.

When it is required to move the washing machine, the ballast may be drained, thereby reducing the overall wei&lt acting on the springs 306 and as such the wheels 304 deploy from the base of the washing machine body 302 causing the washing machine body to raise from the floor 308 (and with it the rubber studs 310) so that the machine may be freely wheeled' to its desired position.

Because each castor wheel 304 is independently spring-loaded, it allows for any uneven areas in the floor to be compensated for, both when moving the machine and when it is stationary.

The system described could be replaced by having a common connection between the four castor wheels 304 that is itself spring loaded, but this would require a stronger spring and reduce the ability to compensate for uneven surfaces.

It should be noted that the above-mentioned embodiment illustrates rather than limits the invention, and that those skilled in the art will be capable of designing many alternative embodiments without departing from the scope of the invention as defined by the appended claims. In the claims, any reference signs placed in parentheses shall not be construed as limiting the claims. The word "comprising" and "comprises", and the like, does not exclude the presence of elements or steps other than those listed in any claim or the specification as a whole. The singular reference of an element does not exclude the plural reference of such elements and vice-versa. The invention may be implemented by means of hardware comprising several distinct elements. In a device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

CLAIMS: 1. A ballast system for a washing machine, the ballast system

comprising a reservoir having means for permitting water to flow between said reservoir and the washing machine drum, the reservoir further comprising an inlet for enabling said reservoir to be filled with water and an outlet for enabling water to be drained from said reservoir, the system further comprising means for filling said reservoir and maintaining said reservoir substantially full of water bçtween washingcycles of said washing machine, wherein the weight of said reservoir when it is substantially full of water acts to counter balance vibrations generated by rotation of said washing machine drum during io a washing cycle.

2. A ballast system according to claim 1, wherein said water is pumped, by a pumping means, between said reservoir and the drum of said washing machine.

3. A ballast system according to either of claims 1 or 2, wherein said ballast system is controlled by the control program of said washing machine.

4. A washing machine having a drum and a ballast system according to claim 1.

5. A washing machine according to claim 4, wherein said washing machine further comprises heating means for heating water from said reservoir for use in said washing machine drum.

6. A washing machine according to claim 5, wherein said heating means is provided in the flow path between said reservoir and said washing machine drum.

7. A washing machine according to claim 5, wherein said reservoir contains heating means, to heat water held therein.

8. A washing machine according to claim 7, wherein said reservoir may be divided into a plurality of sub-reservoirs.

9. A washing machine according to claim 8, wherein one or more of said sub-reservoirs contain a heating means to heat water held therein.

10. A washing machine according to any of claims 5 to 9, wherein said heating means comprises at least one heat generating resistance element.

11. A washing machine according to any of claims 5 to 9, wherein said heating means comprises at least one microwave heating means.

12. A laundry appliance having a rotatable drum and a ballast system comprising a io reservoir having an inlet for enabling said reservoir to be filled with water such that the weight thereof acts to counter-balance vibrations generated by rotation of said drum during a laundry cycle and an outlet to enable water to be drained from said reservoir, said laundry appliance further comprising transport members extending from the base thereof and resting on a support surface when said reservoir is empty, said transport is members being mounted via compressible means relative to respective recesses in said base of said laundry appliance such that when said reservoir is filled with water, the weight thereof acts to compress said compressible means and cause said base of said laundry appliance to be lowered towards said support surface such that at least said compressible means enters said respective recesses and the base of said laundry appliance rests on said support surface.

13. A laundry appliance according to either of claims 11 or 12, wherein said transport means comprises at least one castor wheel.

14. A laundry appliance according to claim 13, wherein said transport means comprises a plurality of castor wheels, being mounted via a respective plurality of compressible means relative to said respective recesses in said base of said laundry appliance.

15. A laundry appliance according to any of claims 12 to 14, wherein said compressible means comprises at least one spring.

16. A laundry appliance according to any of claims 12 to 15, wherein a set of pads are provided on the base of the machine to increase friction between said machine and said support surface.