The specification relates generally to waste storage, and specifically to an actively cooled waste receptacle.
Various facilities, including commercial, industrial, medical, and residential locations, employ provisional waste storage prior to transporting the waste off-site. For example, some municipalities have implemented landfill diversion programs in which residents and businesses separate food and other organic waste from non-organic waste. The resulting collections of organic waste, which are typically stored in bins or bags prior to transportation to municipal composting facilities, can generate foul odors, attract pests, and potentially present a source of disease or infection.
Further examples of the collection of organic waste include the provisional storage of soiled diapers before municipal collection, and the provisional storage of various types of medical waste prior to permanent disposal (e.g. via incineration). These collections can lead to offensive odors, and can also present infection risks.
The above problems with provisional on-site storage of waste, and particularly organic waste, can lead to reduced compliance with municipal waste programs (e.g. users may simply stop sorting organic refuse), medical facility procedures (e.g. workers may improperly dispose of certain waste, or increase the frequency with which collection receptacles are emptied, raising labour and material costs) and the like.
Various attempts have been made to mitigate the above issues using refrigeration. For example, U.S. Pat. No. 3,041,852 describes a waste receptacle whose interior is cooled via refrigeration coils within the receptacle's walls. The coils, in turn, are cooled by a heat pump that is motivated by an external source such as a household refrigerator. U.S. Pat. No. 3,161,030 also describes a waste receptacle with refrigeration coils contained within the inner walls and cooled by a vapor refrigeration cycle employing a compressor.
U.S. Pat. No. 3,650,120 describes a system acting as a hybrid trash compactor and freezer, that generates frozen pucks of refuse by means of wetting, compressing, and freezing (rather than simply cooling).
U.S. Pat. No. 5,181,393 describes a waste container that reduces the growth of bacteria by storing organic waste materials such as compost, medical waste, and diapers in a cool, low humidity environment. In this instance a UV light is also incorporated to further reduce bacterial growth. As with the previous examples, the refrigeration coils are contained within the inner walls of the volume.
U.S. Pat. No. 5,614,107 describes an industrial method of processing liquid sewage sludge by freezing the sludge in order to draw out the moisture, effectively freeze-drying the sludge to transform the sewage into a powder. U.S. Pat. No. 6,092,382 proposes dehydrating household waste by chilling the waste to temperatures just above freezing and in a separate compartment sharing the same atmosphere, accumulating liquid water on refrigeration coils by condensation and then allowing the condensate to run off to a collector where it is evaporated into the atmosphere of the home.
As a further example, German Utility Model No. DE20311066U1 describes a waste receptacle for organic waste or compost, whose interior is cooled by a thermoelectric device employing the Peltier effect.
The above-mentioned attempts to handle organic waste while reducing the incidence of odors, pest attraction and the like suffer from various drawbacks. For example, the arrangement of refrigeration coils may complicate the manufacture and maintenance of such devices, as well as reduce the cooling effectiveness of the devices. Some of the above-mentioned devices may also be difficult for users to load and unload.
According to an aspect of the specification, an actively cooled waste receptacle is provided, comprising: an insulated container including (i) an inner wall defining a chamber having an opening for receiving the waste, and (ii) an outer wall surrounding the inner wall and joined to the inner wall at the opening; a cover configured to prevent access to the chamber via the opening in a closed position, and to allow access to the chamber via the opening in an open position; and a heat pump including an interior heat exchanger exposed to the chamber, the heat pump configured to cool the chamber by absorbing heat from air within the chamber via the interior heat exchanger, and transferring the heat outside the insulated container.
Embodiments are described with reference to the following figures, in which:
The receptacle 100 also includes a cover, which in the present embodiment is an insulated lid 102, for sealing and enclosing the container 101 from the top (though as will be seen below, other orientations are also contemplated for the cover). The lid 102 is configured to prevent access to the chamber 101-2 via the opening 101-3 in a closed position, and to allow access to the chamber 101-2 via the opening 101-3 in an open position (shown in
The above-mentioned heat pump includes an interior heat exchanger, which in the present embodiment is an evaporator 105 (specifically, a roll-bond type evaporator, although other types of evaporators may also be employed) contained within the container 101 and exposed to the chamber 101-2 (that is, exposed directly to the air within the chamber 101-2 rather than being embedded between the inner and outer walls 101-1 and 101-4). Further, in the present embodiment, the evaporator 105 is supported by a mounting member (which may, for example, be a portion of the evaporator itself) within the chamber 101-2 spaced apart from the inner wall 101-1 (i.e. stood off from the rear wall of the container 101 as seen in
The interior heat exchanger (i.e. the evaporator 105, in the present embodiment) has a substantially planar configuration and is mounted substantially parallel to a surface of the inner wall 101-1. In particular, in the embodiment shown in
The heat pump can have a variety of configurations. As noted above, in the present example, the heat pump is a vapor compression heat pump, and thus the evaporator 105 is connected to a compressor 106 and an exterior heat exchanger in the form of a condenser 107 via connecting refrigeration tubing 108 (completing the heat pump circuit) through the walls of the container 101. The exterior heat exchanger exhausts heat absorbed by the interior heat exchanger from the chamber 101-2. More specifically, in the present embodiment a refrigerant fluid is metered by an expansion valve or capillary (not shown) into the evaporator 105, such that the fluid expands into a gas in the evaporator 105 and absorbs heat from the chamber 101-2. The fluid then travels to the compressor 106 and is compressed before travelling through the condenser 107, which removes heat from the fluid before the fluid returns to the evaporator 105 via the expansion valve or capillary.
The embodiment shown in
The receptacle 100 can include a lifting mechanism to lift the lid 102 (i.e. to move the lid 102 from the closed position to the open position) and permit access to the chamber 101-2. The lifting mechanism in the embodiment of
The receptacle 100 can also include a fan mounted within the chamber 101-2 and configured to circulate the air within the chamber 101-2. In the present example, a fan 117 is embedded in an inner surface of the lid 102 (that is, a surface facing the chamber 101-2 when the lid 102 is closed). In other embodiments, as will be discussed in greater detail below, the fan 117 can be embedded in the inner wall 101-1. The fan 117 preferably serves to cause air in the chamber 101-2 to flow directly over the evaporator 105. In the present embodiment, the fan 117 is enabled to direct air over the evaporator 105 by way of a duct 118 (most clearly seen in
In other embodiments, the duct 118 need not be embedded within the lid 102 or the walls of the container 101. Instead, for example, the duct can be mounted on the inner wall 101-1 (and therefore protrude into the chamber 101-2).
In the present embodiment, the interface between the lid 102 and the container 101 is shaped so that a portion (in the present example, that portion representing a majority of the volume of the lid 102) of the lid 102 is nested within the upper walls of the container 101. This is achieved by flaring the inner wall 101-1 outwards adjacent to the opening 101-3, and tapering the bottom of the lid 102 inwards, creating a tapered lid-volume interface. This creates a tapered baffle 119 (see
The receptacle 100 can also include a removable bin 121 (see
To aid in the loading and unloading of the bin 121 from the chamber 101-2, the bin 121 can include a handle 124 with opposing ends affixed to opposing sides of the bin 121. The handle 124 can be rotatable so as to permit raising the handle 124 to remove the bin 121 from the receptacle 100, and lowering the handle 124 upon placement of the bin 121 within the chamber 101-2. The bin 121 can include a handle stop 125 (see
The container 101 can include a guide structure within the chamber 101-2. For example, as seen in
The receptacle 100 also includes a defrosting mechanism removing accumulated frost build up, which in the present embodiment is a heating element 128 (also referred to as a defrost pad) affixed to the evaporator 105. Defrost pad 128 can be an electrically powered resistive strip, and serves to periodically raise the temperature of the evaporator 105 above the freezing point of water (in embodiments in which the temperature of the chamber 101-2 is brought below freezing). When the evaporator 105 is warmed by defrost pad 128, any frost built up on the evaporator 105 melts and runs off of the evaporator 105.
Formed into the bottom of the container 101 wall is a drainage trough 129 (most readily visible in
The receptacle 100 is powered by any suitable electrical power source, such as a standard home outlet through a power cord 134 (see
In operation, the receptacle 100 is provided with electrical power (if required, as noted above), for instance through the power cord 134. The control unit 135 samples the temperature of the chamber 101-2 through the primary temperature sensor 136 and initiates operation of the compressor 106. As a result, the evaporator 105 will become chilled, in the present embodiment to sub-zero (Celsius) temperatures. At the same time, the controller 135 is configured to enable the interior fan 117 to begin circulating air in the chamber 101-2, including passing air over the evaporator 105 via the duct 118. This will reduce the temperature of the air (and subsequently the waste) within the volume 101 to below the freezing point of water.
Independently of the above, a user may remove the bin 121 from the container 101 and affix a bag 122 into the bin 121. This is accomplished by placing the bag 122 in the bin 121 and then forming the opening of the bag 122 around the top edges of the bin 121. The bag 122 is then retained to this shape by inserting portions of the bag (e.g. the handles of a grocery bag) into the retention holes 123. This is accomplished by rotating the handle 124 down and away from the retention holes 123 (as shown in dashed lines in
The user may open the lid 102 by depressing the pedal 113, which pivots the lid 102 about the hinge 116 via the mechanical linkage 114. Alternatively, the user may manually lift or remove the lid 102. The user may then deposit waste into the bag 122 contained within the bin 121 and then release the pedal 113 to close the lid 102 (or manually replace the lid 102, in embodiments where the lid 102 is manually operated).
With waste contained within the bag 122, inside the bin 121 in the loaded position in the container 101, the cooling of the waste, preferably to temperatures below freezing, reduces or eliminates decomposition and the emission of foul odors. Further, a process of sublimation and deposition may occur in the chamber 101-2, in which moisture from the waste is drawn into the cool, dry air in the chamber 101-2 and deposited on the colder surface of the evaporator 105. Periodic activation of the defrost pads 128 and 130 by the control unit 135 melts the frost deposited on the evaporator 105 into water, which runs off into the drainage trough 129. The water then exits through the drain 131 at the bottom of the trough, through the P-trap 132 and into the drain pan 133. As noted earlier, in the present embodiment, the drain pan 133 is located on the compressor 106, where the water evaporates into the atmosphere aided by the waste thermal energy from the compressor 106.
When the bin 121 is full, the user may remove the bin 121 from the container 101 via the opening 101-3 and remove the bag 122, now containing frozen waste, in the opposite order of installation (as detailed above) and then replace the bag 122 with a new one and place the bin 121 back into the container 101 for further waste collection.
The embodiment may also be operated without the bin 121 by placing a bag 122 directly in the chamber 101-2. In some embodiments, the bag 122 may also be omitted, and waste (such as soiled diapers) may be placed directly into the chamber 101-2. Such usage can increase the useable volume for waste within the chamber 101-2, but is not presently preferred, due to the potential for reduced air flow within the chamber 101-2 and the potential for soiling of the evaporator 105 and the inner wall 101-1.
Referring now to
Thus, the receptacle 200 includes a container 101a including an inner wall 101-1a defining a chamber 101-2a with an opening 101-3a and surrounded by an outer wall 101-4a (and joined to the outer wall 101-4a at the opening 101-3a). The opening 101-3a can be closed by a lid 102a having a gasket 103a that engages with an intermediate lip 104a. In addition, the lid 102a and the inner wall 101-1a are tapered near the opening 101-3a so as to provide a baffle 119a. The container 101a is supported by pylons 111a, and contains an interior heat exchanger 105a. In the present embodiment, the interior heat exchanger is an evaporator, and is a component of a heat pump including a compressor 106a and a condenser 107a connected to the evaporator 105a by fluid lines 108a and cooled by a condenser fan 109a.
The receptacle 200 can include a fan 117a mounted within the chamber 101-2a, as well as a duct 118a for directing air onto the evaporator 105a. The evaporator 105a can include a defrost pad (not shown), and the chamber 101-2a includes a drain trough 129a (which can also include a defrost pad, not shown) for directing defrost runoff fluid to a drain 131a for removal of the fluid from the chamber 101-2a and collection in drain pan 133a via a p-trap 132a.
A controller 135a can monitor chamber temperature via a sensor (not shown), and can also monitor the temperature of the evaporator 105a via another sensor (not shown). Based on the monitored state of the receptacle 200, the controller 135a can automatically enable and disable the above-mentioned heat pump and defrost pads.
A bin 121a having bag retention holes 123a and a handle 124a can be loaded into the chamber 101-2a to collect waste within a bag (not shown) supported in the bin 121a. The bin 121a can include indentations 127a for engaging with complementary protrusions 126a formed on the inner wall 101-1a of the container 101a to align the bin 121a.
The receptacle 200 is configured as a freezer appliance integrated into a cabinet 201, for example beneath a countertop 202. The receptacle 200 may be integrated vertically, as with the receptacle 100. Alternatively, as illustrated in
The compressor 106a, condenser 107a, and condenser fan 109a are mounted to a movable base 203. A thermal exhaust duct 204 is provided to the outside of the cabinet 201 to allow heat to be expelled by the condenser 107a. The base 203 is mounted on rails 205 that permit the base 203 to slide in and out of the cabinet 201. The container 101a, as noted above, is supported by the pylons 111a on the base 203, but in other embodiments, the container 101a may sit directly on the base 203. The configuration of supports for the container 101a may be dependent on the depth of the cabinet 201. The sliding motion of the base 203 may be passive and performed by the user, or active and performed via an electromechanical mechanism (e.g. a linear actuator activated by a switch, proximity sensor or the like).
Alternatively, the base 203 may be linked to the cabinet 201 by a hinge and pivot outward, also actuated by the user or performed via electromechanical means. In further variations, the base 203 may be linked to the cabinet 201 by both sliding rails 205 and a hinge so as to protrude and then pivot.
In the present embodiment, the lid 102a is retracted upwards (towards the countertop 202 and away from the opening 101-3a) by a retractor 206, such as a solenoid actuator, that is activated by a switch, such as a proximity sensor 207 (see
Alternatively, the lid 102a may be accessible via a cutout (not shown) in the cabinet countertop 202, in which case the lid 102a would need only pivot to open (similarly to the movement of the lid 102 described earlier in connection with
The exterior of the receptacle 200 that faces the outside of the cabinet 201 can have a cover or shell, which may be arranged to be flush with adjacent cupboards when the receptacle 200 is closed. For example, the receptacle 200 can include a cabinet face 208 fixed to the front of the container 101a so as to blend in directly with the adjacent cabinets. The face 208 can include one or more of the above-mentioned sensor 207, a handle 209, or other structures permitting a user to open the receptacle 200 (e.g. a pedal, not shown).
Operation of the receptacle 200 is similar to that of the receptacle 100. Power is provided (if required, e.g. via an electrical cord, not shown), the heat pump chills the chamber 101-2a, the interior fan 117a circulates air and the bin 121a is lined with a bag 122a.
In contrast to the operation of the receptacle 100, however, to access the receptacle 200 for provisional waste storage, one or more of the sensor 207, handle 209, pedal or the like is activated. Such activation triggers the solenoid 206 (e.g. the controller 135a can detect the activation and cause the solenoid 206) to disengage the lid 102a from the opening 101-3a and permit the base 203 to slide out from the cupboard 201 to expose the container 101a. The user may then deposit waste within the bag contained within the bin 121a and then slide and/or pivot the container 101a back into the cabinet 201. Alternatively, the user may remove the bin 121a from the container 101a and place it on the countertop 202 for collection of waste, re-inserting the bin 121 when they are finished. Once the container 101a is contained within the cabinet 201, the lid 102a re-engages (e.g. the controller 135a can detect the re-insertion of the container 101a and cause the solenoid 206 to move the lid 102a to the closed position), sealing the opening 101-3a. Once waste is contained within the interior volume, the process of freezing, sublimation, and deposition as described above takes place to retard odors and reduce or eliminate bacteria growth and decomposition of the waste. As also described earlier, automatic defrost can be initiated periodically to keep the evaporator 105 free from excessive frost build-up.
Referring now to
Thus, the receptacle 300 includes a container 101b including an inner wall 101-1b defining a chamber 101-2b with an opening 101-3b and surrounded by an outer wall 101-4b (and joined to the outer wall 101-4b at the opening 101-3b). The opening 101-3b can be closed by a lid 102b having a gasket 103b that engages with an intermediate lip 104b. The lid 102b moves between a closed position and an open position via a hinge 116b. In addition, the lid 102b and the inner wall 101-1b are tapered near the opening 101-3b so as to provide a baffle 119b. The container 101b contains an interior heat exchanger 105b, which is a component of a heat pump also including an exterior heat exchanger 107b cooled by a fan 109b. The receptacle 300 can include a fan 117b mounted within the chamber 101-2b, for directing air onto the heat exchanger 105b.
A controller 135b can monitor chamber temperature via a sensor (not shown), and can also monitor the temperature of the heat exchanger 105b via another sensor (not shown). Based on the monitored state of the receptacle 300, the controller 135b can automatically enable and disable refrigeration and defrosting functions of the receptacle 300. The controller 135b and other components can be powered via an electrical cord 134b, or any other suitable power source.
A bin 121b having bag retention holes 123b and a handle 124b can be loaded into the chamber 101-2b to collect waste within a bag (not shown) supported in the bin 121b. The bin 121b can include an indentation 127b for accommodating the heat exchanger 105b and fan 117b, and also for assisting in aligning the bin 121b within the chamber 101-2b.
The receptacle 300 is configured as a freezer appliance sized to fit on a counter (e.g. a kitchen counter). The interior heat exchanger 105a is a component of a thermoelectric (rather than vapor compression as in the previous embodiments) heat pump. The interior heat exchanger 105b is therefore implemented as a heatsink, and the heat pump also includes a thermoelectric device 301 employing the Peltier effect and having a hot side and a cold side. As will be apparent to those skilled in the art, the hot side and cold side of the device 301 are switchable, and the state of each side depends on whether the receptacle 300 is being refrigerated or defrosted, as described below.
The exterior heat exchanger 107b is also a heatsink, and can be covered by a protective cover 305. The heatsinks 105b and 107b are plate and fin heatsinks. In other embodiments, the heatsink 107b can be replaced by a liquid-cooled heatsink (e.g. having cooling block mounted on device 301 and circulating fluid therethrough, with the fluid being pumped through a radiator to dissipate heat collected by the fluid). In other embodiments, the heat pump of receptacle 300 may be replaced with a vapor compression heat pump such as those discussed earlier.
The bin 121b is provided in the form of a removable basket (and is therefore also referred to as a basket 121b). The basket is made from perforated or meshed sheet material (e.g. plastic, aluminum, or the like) to allow air to flow through, improving the cooling effect on the contents of the basket 121b. The basket 121b can be shaped to guide the convective airflow throughout the interior volume. Ducting or air-flow channels (not shown) may also be shaped into the walls of the lid 102b and basket 121b. This basket has a flat rim 307 that allows it to sit on the intermediate lip 104b of the container 101b. This suspends the remainder of the basket within the container 101b, allowing air to also circulate around and underneath the basket 121b and its contents. The basket 121b contains two cutout handles 308 to allow the removal of the basket 121b from the container 101b. A portion of a bag can be retained within these cutout handles 308 to conform the bag to the shape of the basket 121b (that is, the handles 308 can perform the same function as the retention holes 123 and 123a discussed earlier).
The lid 102b may be opened and closed via a tab 309. Alternatively, the lid 102b can be operated via a contact (a switch, button, or the like, not shown) or a proximity sensor (not shown) to actuate the lid 102b open by means of a solenoid 310 or other electromechanical means.
The receptacle 300 can include a removable drip cup 311 positioned below the interior heat exchanger 105b to collect defrosted water. The drip cup 311 made be made of silicon or other pliable material to allow ice to be easily removed therefrom.
The receptacle 300 is operated by first providing power (e.g. via cord 134b). The control unit 135s initiates the thermoelectric device 301. As a result, the interior heat exchanger 105b is cooled below a threshold temperature (preferably a sub-zero Celsius temperature). At the same time, the interior fan 117b begins circulating air throughout the chamber 101-2b. This will reduce the temperature of the air (and subsequently the waste) within the chamber 101-2b to below freezing. Independently of this, the user may remove the basket 121b and install a bag into the basket 121b and around the flat rim 307, inserting a portion of the bag through the cutout handles 308 to conform to the shape of the basket 306.
To access the receptacle 300, the user shall can lift the lid 102b via the tab 309 or the above-mentioned switch or proximity sensor. The user may then deposit waste within the bag and close the lid 102b. Once waste is contained within the chamber 101-2b, the process of freezing, sublimation, and deposition begins to retard odors and reduce or eliminate bacteria growth and decomposition of the waste as described earlier.
Periodically, the controller 135b can control the thermoelectric device 301 to switch the cold and hot sides thereof, to heat (rather than cool) the interior heat exchanger 105b for defrosting. This will cause the interior heat exchanger 105b to warm, melting any frost buildup into water. This water will drip into the drip cup 311 and may freeze into ice. This cup can be emptied periodically (e.g. by a user). When the basket 121b is full, the user may remove the bag containing frozen waste and then replace the bag with a new one.
Referring now to
Thus, the receptacle 400 includes a container 101c including an inner wall 101-1c defining a chamber 101-2c with an opening 101-3c and surrounded by an outer wall 101-4c (and joined to the outer wall 101-4c at the opening 101-3c). The opening 101-3c can be closed by a lid 102c having a gasket 103c that engages with an intermediate lip 104c. In addition, the lid 102c and the inner wall 101-1c are tapered near the opening 101-3c so as to provide a baffle 119c. The container 101c contains an interior heat exchanger 105c. In the present embodiment, the interior heat exchanger is an evaporator, and is a component of a heat pump including a compressor 106c and a condenser 107c connected to the evaporator 105c by fluid lines 108c and cooled by a condenser fan 109c.
The receptacle 400 can include a fan 117c (the present embodiment includes two fans 117c) mounted within the chamber 101-2c, each pulling air into a duct 118c for directing air onto the evaporator 105c. The evaporator 105c can include a defrost pad 128c (two pads 128c are shown), and the chamber 101-2c includes a drain trough 129c (which can also include a defrost pad, not shown) for directing defrost runoff fluid to a drain for removal of the fluid from the chamber 101-2c and collection in drain pan 133c via a p-trap 132c.
A controller 135c can monitor chamber temperature via a sensor (not shown), and can also monitor the temperature of the evaporator 105c via another sensor (not shown). Based on the monitored state of the receptacle 400, the controller 135c can automatically enable and disable the above-mentioned heat pump and defrost pads 128c. A removable bin 121c having bag retention holes 123c and a handle 124c can be loaded into the chamber 101-2c to collect waste within a bag 122c supported in the bin 121c.
The receptacle 400 is configured as a standalone freezer appliance, sized appropriately for industrial or commercial use in that its overall dimensions are suitable for use in the garbage room of an apartment complex, in a hospital/nursing home setting or other facility requiring provisional waste storage.
The container 101c extends to a base 110c of the embodiment. Instead of being vertically integrated, the compressor 106c, condenser 107c, and other refrigeration components are located behind the container 101c (as seen in
The container 101c is accessible through a secondary opening in the form of an insulated door 402 on the front of the receptacle 400, which swings open on door hinges 403. The door 402 has a door gasket 404 to seal the container 101c from the front, and can taper similarly to the lid 102c to form a baffle similar to baffle 119c with container 101c. The door 402 may be kept shut by a door latch 405 or magnet and can include a door handle 406 or other mechanism for opening the door 402. The door 402 may be configured as a double door, pivoting off of either side of the container 101c. In such embodiments the double doors would latch to each other.
In contrast to the bins of the previously discussed embodiments, removable bin 121c is implemented as a wheeled cart (and is therefore also referred to as a cart 121c). The cart 121c has walls, an open top, and locomotive devices such as castor wheels 408 on the bottom. The shape of the cart 121c conforms to the shape of the chamber 101-2c, with some allowance for air circulation. As noted above, the cart 121c can also include a handle 124c. In the present embodiment, two handles 124c are provided that also act, in combination with a protruded fulcrum feature 411, as pivot grips 412 that allow the cart 121c to pivot about an axis to facilitate dumping the contents of the cart 121c into a larger collection bin or chute.
The receptacle 400 includes a guide structure for aligning the cart 121c. Rather than the protrusions 126 and indentations 127 mentioned earlier, however, the container 101c defines raceways 413 for receiving the caster wheels 408. Further, at the bottom of the container 101c along the interface with the door 402 is a ramp 414 to facilitate rolling the cart 121c into and out of the container 101c. The cart 121c itself may also have a door (not shown) to allow easy unloading of heavy bags full of waste.
The receptacle 400 can include a volume sensor (e.g. a fill level proximity sensor 415), a weight sensor (e.g. a load sensor disposed within one or both of the raceways 413), or a combination thereof, permitting the controller 135c to determine the current fill level and/or weight of the bin 121c. In other embodiments, the above-mentioned sensors may be mounted on the cart 121c itself. The receptacle 400 can include an output device for indicating how full the cart 121c is. The output device can include any one of, or any suitable combination of, a light 417, a display panel 418, a speaker for generating an audible signal, a (wired or wireless) network interface integrated with or otherwise connected to the controller 135c, and the like.
In the case of the above-mentioned network interface, the controller 135c may be connected to a network and communicate with a central hub through a smartphone or computer application whereby a multitude of other receptacles may be connected, all displaying their current level of waste.
The receptacle 400 is operated by first providing power to the unit. If the receptacle 400 is network enabled, it will connect to the network at this time and initiate a flow of information. The heat pump is then initiated (e.g. by the controller 135), cooling the container 101c to below a threshold (e.g. 0 degrees Celsius).
Independent of this, the user may unlatch the door 402 of the receptacle 400 and roll out the cart 121c, making use of the ramp 414 for this purpose. Once removed, the user may insert a bag 122c into the cart 121c, making use of the retention features 123c to conform the bag 122c to the internal shape of the cart 121c. The user may then roll the cart 121c back into the container 101c and close the door 402, using the latch 405 to retain it shut.
In regular usage, if the user has a small item to deposit (such as a diaper or small bag of refuse) they may use the deposit hatch 401 located within the lid 102c to quickly deposit an item. The user may actuate the deposit hatch 401 by use of the proximity sensor 407. This will activate the mechanism that opens the deposit hatch 401 to allow the user to deposit the refuse. The refuse will fall into the bag 122c contained within the cart 121c, within the volume 101.
If the user has a larger item to deposit, such as a soiled bedsheet, they may lift the lid 102c up entirely. This may be done by hand or using another pedal, proximity sensor, or contact. The lid 102c may be kept open by a gas spring cylinder, stopper, tension spring, or other mechanism to allow the user to deposit the larger item into the bag 122c within the cart 121c.
At such a time as the waste within the cart 407 meets a predetermined volume or weight, as determined by the fill level proximity sensor 415, load sensor 416, or other means, the controller 135c is configured to communicate that it is at capacity and requires emptying. Such communication may be achieved by activating any one or more of the indicator light 417, the display panel 418, or any other output devices that are present. If linked to a network, the controller 135c can communicate via the network (e.g. to a client computing device such as a smartphone) that the receptacle 400 requires emptying. Such network communication permits, in the case of a plurality of receptacles 400 deployed throughout a health care facility apartment complex or other site, a user to plan their route based on which receptacles 400 are indicating that they require emptying.
Once waste is contained within the chamber 101-2c, the process of freezing, sublimation, and deposition begins to reduce or eliminate odors and stall bacteria growth and decomposition of the waste as in the first embodiment. As described earlier, automatic defrosting can be initiated periodically by the controller 135c to keep the evaporator 105c free from excessive frost build-up.
Other variations to the above embodiments are also contemplated. For example, the use of thermoelectric devices or other refrigeration methods are interchangeable with the refrigeration means described above. Alternative means of defrost such as electrical impulse, ice phobic coatings, and vibrations, or other means yet devised can be employed. Alternative means of power such as photovoltaic and wind turbines may be employed. Temperatures may be adjusted to above the freezing point of water for some applications.
Changes in size, shape, and appearance to accommodate different commercial applications such as restaurants, food trucks, nursing homes, hospitals, apartment complexes, and public spaces may be made.
Further embodiments can include two or more distinct compartments rather than a single chamber 101-2. At least one, and possibly (though not necessarily) all of the compartments can be refrigerated as described above. The number of distinct compartments can vary based on the number of different waste items requiring sorting. Each non-refrigerated volume is contained by a removable bin that holds provisions such as clips or holes to retain a waste bag to the shape of the bin. Each non-refrigerated compartment may also contain a lid, opening, trap door, or simple opening, and a means to access such as a pedal, linked to the lid by a mechanical linkage, a proximity sensor or contact motivated by electromechanical means, similar to existing multi-compartment waste receptacles found in the marketplace.
In other embodiments, the removable bin (e.g. the cart 121c) may tilt outwards rather than being removed entirely from the container 101c). Other modifications may also be made to the embodiments described herein; for example, an outdoor implementation of an actively cooled waste receptacle may be provided as an insulated dumpster, with a sufficiently robust exterior to resist damage from animals and the elements.
The scope of the claims should not be limited by the embodiments set forth in the above examples, but should be given the broadest interpretation consistent with the description as a whole.
Filing Document | Filing Date | Country | Kind |
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PCT/IB2016/054821 | 8/10/2016 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/029510 | 2/15/2018 | WO | A |
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