<33 225
BEVERAGE CHILLER
FIELD OF THE INVENTION
The present invention relates to beverage chillers There is a need to chill carbonated and non-carbonated bulk beverages 5 such as, for example, beer and wine In some situations there is a requirement to produce a constant flow of chilled beverage at a temperature of as low as 2 to 3°C at a flow rate of up to 50 litres per hour These parameters place demanding requirements on suitable equipment
One known technique for chilling bulk beverages is to pass the beverage 10 through a continually refrigerated ice bag However this technique suffers from a limitation on the flow rate which can be achieved whilst maintaining the desired chilled temperatures
Another known beverage chiller is a product known as TEMPRITE In this product, the beverage passes through a single spiral coil that is immersed in 15 refrigerant In order to ensure a constant level of refrigerant this product uses a float in conjunction with a cartridge valve However a shortcoming with this equipment is that it requires frequent ongoing maintenance with the ensuing cost associated with servicing For example, the float and cartridge valve control utilised in the product is prone to sticking in an open position or leaking after a 20 period of use If such conditions are left unchecked, flooding of the refrigerant into the compressor can occur and can lead to compressor failure
It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative SUMMARY OF THE INVENTION 25 According to the present invention, there is provided a beverage chiller comprising at least two interconnected canisters, each canister defining a chamber for refrigerant, said chamber including a plurality of pipes extending along the length of the chamber for the flow of beverage therethrough, each canister including flow control means to ensure flow of beverage up and down the 30 refrigerant chamber in a plurality of cooling passes, said refrigerant chambers intellectual property office | of nz
2 1 DEC 1999 RECEIVED
2 2 5 P
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being pressure balanced and arranged to be coupled to a source of refrigeration via a thermostatic expansion valve
Unless the context clearly requires otherwise, throughout the description and the claims, the words 'comprise', 'comprising', and the like arc to be 5 construed in an inclusive sense as opposed to an exclusive or exhaustive sense, that is to say, in the sense of "including, but not limited to"
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2 I r:c 1993
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Preferably the canisters are interconnected such that the beverage completes its cooling passes in one canister before completing further cooling passes in the second canister
Preferably a flow control means is provided at each end of each canister 5 to ensure flow of beverage up and down the refngerant chamber in a plurality of cooling passes It is further preferable that the flow control means compnses a partitioned plate provided at each end of each canister
It is further preferable that each of the chambers is coupled to a source of refngerant and an evaporator pressure regulator valve 10 Preferably the refngerant chambers of the canisters are interconnected at three points along the length of the canister where a first connection is a suction connection that is in turn coupled to a compressor of a refrigeration circuit, a second connection is a balancing pipe that ensures pressure balance between said canisters, and a third connection is a thermal expansion valve feed 15 connection
It is also preferable that the pipes of each chamber are arranged in an array which is parallel to the principal axis of the canister BRIEF DESCRIPTION OF THE DRAWINGS
By way of example, a preferred embodiment of the present invention will 20 now be descnbed with reference to the accompanying drawings in which
Figure 1 is a side elevation view of a preferred embodiment of a beverage chiller according to the present invention,
Figure 2 is a plan view of the beverage chiller depicted in Figure 1, and Figures 3 and 4 are plan views of upper and lower directional flow plates 25 utilised in the preferred embodiment of the beverage chiller DISCUSSION OF THE PREFERRED EMBODIMENT
The beverage chiller 10 illustrated in the accompanying drawings compnses two stainless steel canisters 11 and 12 of approximately 100 millimetres (« 4 inches) in diameter and 350 millimetres (» 13 5 inches) in 30 length Each canister 11,12 preferably houses thirty two stainless steel pipes 20 of relatively small bore that are arranged in an array which is parallel to the pnncipal axis of the canister The pipes 20 are of 4 8 millimetres (3/16 inch)
Printed from Mimosa 16 39 43
3
nominal bore and approximately 300 millimetres (=12 inches) in length and are supported at either end by directional flow plates 21, 22 The directional flow plates 21, 22 are provided with thirty two small holes 23 and the ends of the pipes 20 are welded into these holes The upper flow plate 21 has its upper 5 surface 26 segmented into five compartments 30, 31, 32, 33, 34 by upwardly projecting and radially extending baffles 27 The lower plate 22 has its lower surface 28 segmented into four compartments 35, 36, 37, 38 by radially extending baffles 29 Each plate 21, 22 is welded to the interior of the canister 11 or 12 at a position approximately 10 millimetres (-0 5 inch) below the top 10 and bottom of the canister The canisters are closed and sealed at both ends 40, 41 Five segments 43 are individually welded to the upwardly projecting baffles 27 to seal the upper end 40 of each of the canisters, whilst four segments 44 are individually welded to the downwardly projecting baffles 29 to seal the lower end 41 of each of the canisters 15 The cavities 50 that house the pipes 20 between the directional flow plates 21, 22 of the canisters contain refngerant and are coupled to a standard refrigeration circuit which includes a source of refngerant and an evaporator pressure regulator valve It is understood that the design and operation of the refngeration circuit would be well known to those skilled in this art and therefore 20 it is not descnbed in detail in this specification
As shown in Figure 1, the refngerant cavities 50 of canisters 11, 12 are interconnected at three points 53, 54, 56 along the length of the canisters The upper connection 53 is a suction connection that is in turn coupled to the compressor of the refngeration circuit The central connection 54 is a balancing 25 pipe that ensures pressure and refrigerant level balance between the canisters 11, 12 The lower connection 56 is a T.X (Thermostatic Expansion) valve feed connection The T X valve temperature control is located at a point approximately 300 millimetres (=> 12 inches) along on the upper connection 53 on the suction pipe to the compressor
Printed from Mimosa 16 39 43
PCT/AU97/MI53
4
The end segments 43, 44 are welded against the adjacent outer edges of the baffles 27, 29 to define segmented compartments 30 to 34 and 35 to 38 at each end of the canisters 11,12 As shown in Figure 2, one compartment 30 at the top of each canister has an opening which constitutes the beverage inlet 61 5 and beverage outlet 62 The compartments 34 are interconnected by a bndge 65
In use the beverage to be chilled enters the first canister 11 via the inlet 61 into compartment 30 The beverage then flows down the four small bore pipes 20 contained in segment 30 to reach the compartment 35 defined by the 10 lower directional flow plate 22 The beverage then flows up the four pipes to reach the upper compartment 31 It then flows down four pipes to reach compartment 36, back up to compartment 32, down to compartment 37, up to compartment 33, down to compartment 38 until it reaches upper compartment 34 from where it proceeds to the second canister 12 via bndge 65 where the 15 circulation operation is repeated
As the beverage passes through the chiller in each canister, it is passed through four single pipes concurrently and then returns to a separate set of four pipes that are all identical in size Consequently, the beverage is passed through eight sets of four pipes in each canister This lengthy and convoluted 20 route for the beverage to pass is contained within the source of refrigerant which means that there is an enormous opportunity for heat exchange between the refngerant and the beverage Consequently, the beverage chiller has the capacity to chill beverages to the desired temperatures of 2 to 3°C whilst providing a flow rate of 50 litres an hour The design of the beverage chiller 25 provides a heat exchanger of high efficiency which allows the performance cntena to be reached with a very compact unit that is very efficient in the use of power
This system is designed to operate on a variety of refngerants and especially 134A or R12 30 Each canister is mounted with its axis vertical and filled to 75% of full capacity with refngerant The T X valve controls throughput of refngerant whilst at the same time acting as a level control ATX valve is a simpler and more
Printed from Mimosa 16 39 43
efficient means of controlling refrigerant levels than the complicated float valve that is currently used The beverage chiller can be incorporated intc a refrigeration circuit or could be simply coupled to an existing refrigeration system
Overleaf are results of a test programme in which water was supplied into the beverage chiller at temperature of 17 5°C and a 10oz glass was drawn off every 20 seconds for one hour The temperature of each glass of water drawn off was noted as ranging from 0 7°C to 2 9°C at a delivery of 51 2 litres per hour (« 11 25 gallons per hour)
Although the invention has been described with reference to specific examples it will be appreciated by those skilled in the art that the invention may be embodied in many other forms intellectual pro^erttomcti OF wz |
2 I DEC 1009 RECEIVED
PCT/A1)97/00153
6
No
■C
Temp
No
"C Temp
No
<C Temp
No
<C Temp
No
«C Tamp
No
«C Temp
1
0 8
31
23
61
1 8
91
1 6
121
1 7
151
1 7
2
0 7
32
23
62
1 8
92
1 7
122
1 6
152
1 7
3
08
33
23
63
1 8
93
1 6
123
1 6
153
1 6
4
1 1
34
22
64
1 8
94
1 6
124
1 6
154
1 7
1 6
22
65
1 8
95
1 6
125
1 7
155
1 7
6
1 8
23
1 8
1 6
1 6
1 7
7
2.3
1 8
1 6
1 7
1 7
8
2 1
23
1 8
1 6
1 7
1 7
9
2 1
23
1 8
1 6
1 7
1 7
2 1
40
23
70
1 8
100
1 6
130
1 7
160
1 7
11
2 1
23
1 9
1 6
1 6
1 7
12
22
22
1 9
1 6
1 7
1 7
13
23
22
1 9
1 6
1 7
1 7
14
23
2 1
1 9
1 6
1 6
1 7
23
1 9
1.5
1 6
1 7
16
24
1 8
1 9
1 6
1 7
1 6
17
24
1 8
1 9
1 7
1 7
1 7
18
24
1 9
1 7
1 8
1 8
19
1 9
1 6
1 7
1 7
26
50
22
80
1 9
110
1 6
140
1 7
170
1 7
21
2 1
1 6
1 7
1 7
22
26
1 9
1 6
1 7
1 7
23
27
1 9
2 0
1 G
1 7
1 8
24
27
1 8
1 7
1 7
1 8
28
1 7
2 1
1 6
1 8
1 7
26
28
1 7
1 9
1 6
1 7
1 8
27
29
1 7
1 8
1 6
1 7
1 8
28
29
1 7
1 7
1 7
1 7
1 8
29
26
1 7
1 7
1 7
1 7
1 7
60
1 8
90
1 7
120
1 7
150
1 6
160
1 7
Supply Water at 17 5'C
1 x 10 oz Glass aamplos every 20 seconds for 1 hour
Total 180 Glasses (1 BOO fluid ounces) -11 25 Gallons -512 litres
SUBSTITUTE SHEET (RULE 26)
Printed from Mxmosa 16 39.43