CN1160161A - Storage tank water heater tempering system - Google Patents

Abstract

A hot water tempering system includes a heat exchanger interposed between the hot water outlet means and the cold water inlet means for transferring heat from hot water exiting from the tank to cold water entering the tank. In this way the temp. of the hot water is tempered. The system is characterized by the fact that the cold water inlet means comprises a first conduit which passes through the heat exchanger to receive heat transferred from the hot water, and a second conduit which bypasses the heat exchanger and delivers cold water directly to the tank. The two inlet conduits are connected to a cold water mains inlet by way of a diverter.

Description

The heating system of the box water heater of water storage

The present invention relates to the heating system of the box water heater of water storage, this system is in than higher temperature so that satisfy management of the use of water and the needs of bacteria growing inhibiting the water that is stored in the water storage tank, the water of supplying with the user will be heated to simultaneously and not scald dangerous temperature.

In straight consumption formula system, for example when domestic water is provided in the normally used system, can get off to reduce the danger of scalding to greatest extent by the maximum heating temperature of water being fixed on 60 ℃ of so lower temperature.The shortcoming of doing like this is the growth that can help bacterium under hypothermal water temperature; In addition, when needs heated continually again, above-mentioned way was wasted very much.

In order to overcome these shortcomings, the multiple heating system that is used for the box water heater of water storage has been proposed so far.Wherein at people's such as Perlman U.S5, disclose a kind of like this system in 115, No. 491 patents, the further advantage of this system is that it can improve original conventional water heaters system.

Disclosed heating system is a kind of like this system in people's such as above-mentioned Perlman the patent, it comprises: the water storage tank that has heater, cold water waterworks that hot water is delivered to the drainage arrangement of water distribution system and as required water storage tank filled again as required.Drainage arrangement and cold water waterworks link to each other by heat exchanger so that at the hot water of discharging with enter between the cold water of water storage tank and carry out heat exchange.When the temperature of the water of discharging from water tank is lower than certain value, make the cold water that enters walk around heat exchanger with starting valve.

The present invention is the improvement to systems that the people carries such as Perlman, system of the present invention makes temperature in the water maintenance that is stored in the water storage tank, this temperature is a little less than temperature required in the existed system but still can adapt to the needs of water and bacteria growing inhibiting, can provide simultaneously to avoid occurring scalding dangerous hot water.

According to the present invention, in the heating system of described type, the cold water waterworks comprise: first water pipe, the heat that it passes heat exchanger and absorb the hot water of discharging from water tank, second water pipe, it is walked around heat exchanger and is communicated with the lower area of water tank so that directly carry cold water to water tank, and three-way flow divider valve, and its first water pipe and second water pipe and a shared main entrance connect in each other.Can control flow divider so that between first and second water pipes, distribute cold water stream equably according to the temperature of the water of from water storage tank, discharging.Measure the hot water temperature who from water tank, discharges with temperature sensor.

In a preferred embodiment of the invention, flow divider is a threeway balanced hydraulic valve, and it has three operating positions, promptly, primary importance, the water temperature that records owing to temperature sensor on this position is higher than maximum set value, so flow divider opens first water pipe and cuts out second water pipe; The second place, the water temperature that records owing to temperature sensor on this position are lower than minimum setting value, so flow divider cuts out first water pipe and opens second water pipe; And the centre position, on this position since the water temperature that records between minimum and maximum setting value, flow divider is divided equally the cold water stream between first water pipe and second water pipe.

Illustrate the preferred embodiments of the present invention below with reference to accompanying drawings.

Fig. 1 is the schematic diagram of electrically operated straight consumption formula domestic hot water heating system of the present invention;

Fig. 2 represents identical with Fig. 1 but has changed the heating system of water inlet joint;

Fig. 3 is the schematic circuit diagram that expression is electrically connected with heater.

As mentioned above, heating system of the present invention is the U.S5 to people such as Perlman, the improvement of system described in 115, No. 491 patents, and this patent is incorporated herein by reference.As shown in Figure 1, the heating 11,12 that is located at respectively in water tank water storage space bottom and the upper area is housed in the hot water cistern 10, links to each other so that the water in the heating water tank with power supply 30 heating element heater resembles hereinafter described.Encase water tank 10 so that the heat leakage of depositing hot water is reduced to minimum with insulating materials 14 such as for example glass fibres.

This system is provided with a drainpipe 15 that is communicated with the water storage tank upper area, it is used for as required to water distribution system 16 delivering hot waters, also be provided with the cold water waterworks of as required water tank being filled once more 17,18, and drainpipe 15 and cold water waterworks are linked up so that a hot water heat of discharging from water tank is sent to the heat exchanger 19 in the cold water that enters water tank.According to the present invention, the cold water waterworks comprise first feed pipe 17 and second feed pipe 18, and are as described below, and these two feed pipes link to each other with a shared main-inlet 20 by a flow divider 21.

Heat exchanger is contained between cold water feed pipe 17 and the drainpipe 15.The sort of copper coin heat exchanger that heat exchanger 19 is preferably described in people's such as above-mentioned Perlman the patent.Two water pipes 15,17 pass heat exchanger, and heat exchanger is provided with the heat transfer medium that is used for heat transfer between the drainpipe 15 and first feed pipe 17, and such two water pipes just can directly not contact but separate each other.By the best water flow of water pipe 15,17 by heat exchanger transmission being and stream, that is to say, is the current of equidirectional.

According to the order that flows through heat exchanger, the hot water in the drainpipe 15 is heated, and the cold water that enters is heated with the heat that is transferred to first feed pipe 17.Preferably making conducts heat carry out fully and make the water of discharging two water pipes, be in uniform temp from heat exchanger.

By the flow divider 21 with actuator 22 feed pipe 17,18 is connected on the shared main-inlet 20, actuator response is installed in the temperature sensor signal on the water tank 10 and is subjected to the control of this sensor.Make it the water temperature in the water tank upper zone is reacted on adorning temperature sensor in place.Flow divider is a threeway balanced hydraulic valve preferably, for example the VC series of valves of being produced by Honeywell.This valve has a main-inlet that directly links to each other with shared main-inlet 20, and first outlet that links to each other with first feed pipe 17 is with second outlet that links to each other with second feed pipe 18.Flow divider 21 has three operating positions, and each operating position is determined according to the hot water temperature that temperature sensor 23 records by actuator 20.Promptly, when the water temperature in the water tank upper zone that is recorded by temperature sensor 23 rises to when being higher than maximum set value, actuator moves on to first operating position to valve, makes all cold water of introducing flow through heat exchanger 19 thereby open first feed pipe 17 and close second feed pipe 18 on this position.When the hot water temperature in the water tank upper zone that is recorded by temperature sensor 23 is lower than minimum setting value, valve is moved on to second operating position, on this position, close first feed pipe 17 and open second feed pipe 18 so that make all cold water of introducing flow through feed pipe 18.Feed pipe 18 is walked around heat exchanger 19 and is linked to each other with tank entry 24, thereby this inlet is communicated with water tank 10 lower areas and can be delivered directly to the cold water of introducing in the water tank.

When the hot water temperature of temperature sensor 23 indication was between maximum set value and the minimum setting value, flow divider 21 moved on to the centre position, on this position flow divider with the cold water flow point introduced to first and second feed pipes.

On the zone line about first feed pipe 17 terminates in the water storage tank space 13 between the zone, and terminal diffusing globe 25 is housed on the clearing end of this feed pipe, diffusing globe is diffused into the preheating water of introducing in the zone line.

Enter an additional security feature of water distribution system as the water that prevents to cause scald, be provided with independently safety shut-off valve 26 and temperature sensor 27 in the drainpipe 15 between heat exchanger 19 and water distribution system 16.When the water that provides surpassed maximum set temperature value, shutoff valve 26 was with the signal of response temperature sensor 27 and close drainpipe 15, ends thus to supply water to water distribution system.

Referring now to Fig. 2, power supply 30 is connected on the high temperature limit control thermoregulator 31, when the water in detecting water tank 10 surpasses the greatest limit temperature of setting, thermoregulator 31 will cut off the electricity supply 30 automatically.Determine according to government standard with this greatest limit temperature in the hot water supply system in life.In North America, usually life is decided to be 90-96 ℃ (194-205 °F) with the standard of water heater, but industrial system is not so limited, if make water tank with suitable material then the greatest limit temperature can be established De Genggao.

The power supply that is connected on heating element heater and 12 is communicated with double-throw or bistable state multi-harmonic-oscillations relay 32, relay combines with thermoregulator so that the temperature of water drops to minimum setting value in water tank, that is, be generally 50-60 ℃ (122-140 °F) and disconnect itself and being connected of one of them heating element heater when following.

Once only start a heating element heater or 12.Normally make element 12 work up to the set point that the water in the water tank is heated to thermoregulator 31.Thermoregulator starting relay 32 makes between power supply and the element 12 and disconnects then, and power supply and thermoregulator 33 are connected.

According to the present invention, by relay 32 being connected on the thermoregulator 33 of bottom of normally closed box-like cut-out relay 34 forms with water controller.When closed, breaker can make thermoregulator 33 work detecting the water temperature around the element 11 in the water storage tank, and promptly is generally 50-60 ℃ (122-1400F) starting element 11 when following when water temperature drops to minimum the setting value.During disconnection, breaker 34 disconnects with thermosistor 33, thereby makes element 11 end to start indirectly.

In a word, this system is in the following manner.During non-maximum, the water in the water storage tank 10 is heated to 75 ℃ by the lower heating element of controlling by the thermoregulator 33 of bottom 11.When discharging hot water, the current of discharging from water tank 10 are through drainpipe 15, heat exchanger 19 and shutoff valve 26.As long as the water temperature that flows through shutoff valve 26 that recorded by temperature sensor 27 is lower than 65 ℃, shutoff valve will keep off-state, in case and temperature above 65 ℃, shutoff valve is with closure.Cold water from shared main-inlet 20 must flow through flow divider 21.If the hot water temperature who is recorded by temperature sensor 23 is higher than 77 ℃, then the cold water of introducing is turned to heat exchanger by feed pipe 17, at this original hot water from water tank 10 is heated.If water temperature is between 63 ℃ and 77 ℃, flow divider 21 will move on the centre position, so that distribute the current of introducing between two feed pipes 17,18.If the water temperature of discharging from water tank is lower than 63 ℃, flow divider will move to second operating position, by second feed pipe 18 all cold water of introducing all be delivered to tank entry 24 on this position.

During maximum, by the power supply of timing control switch 34 sever supply lower heating elements 11 and thermoregulator 34.If the water temperature that is recorded by upper temp adjuster 32 is lower than 50 ℃, then starts top heating element heater 12 water above the element is heated to 50 ℃.

If the water temperature of water tank upper is raised to more than 94 ℃, then start the power supply of limit for height temperature thermoregulator sever supply heating element heater.Disconnect after the power supply of supplying with heating element heater, flow divider 21 and safety shut-off valve 26 will remain on the preceding residing position of dump.Have the reserve battery that keeps clock time for the cycle of continuity on the timing controller, can guarantee when connecting power supply once more that like this water heater can carry out operate as normal again.

Claims (8)

1. the heating system of hot water water storage tank, it is provided with interior water storage space, at the lower area of interior water storage space a heater is housed, and the temperature sensor of a response water temperature is housed at the upper area of interior water storage space; With the drainage arrangement that the top of said water storage space is connected, it delivers to water distribution system to hot water as required; Cold water waterworks that water tank is filled again as required; With the heat exchanger that said drainage arrangement is connected with said cold water waterworks, its heat is transferred to the cold water that enters water tank from hot water, wherein the cold water waterworks comprise: first water pipe, and it passes heat exchanger and absorbs said transmission heat at this; Second water pipe, it is walked around heat exchanger and is communicated with so that directly deliver to water in the water storage space with the bottom of water storage space; And flow divider, it makes in said first and second water pipes and a shared main-inlet and connects together, the signal of flow divider response temperature sensor also is subjected to the control of temperature sensor, thereby can divide equally cold water stream between said first and second water pipes according to the temperature of the water of discharging from water storage tank.

2. heating system as claimed in claim 1, wherein flow divider is a threeway balanced hydraulic valve, this valve has an inlet that links to each other with said shared main-inlet, with first and second outlets that link to each other with said first and second water pipes respectively.

3. heating system as claimed in claim 2, wherein when the water temperature of temperature sensor indication is higher than maximum set value, flow divider moves on to first operating position, flow divider opens said first water pipe and cuts out said second water pipe on this position, and when the water temperature of temperature sensor indication is lower than minimum setting value, flow divider moves on to second operating position, flow divider cuts out said first water pipe and opens said second water pipe on this position, when the water temperature of temperature sensor indication is between said maximum set value and the minimum setting value, flow divider moves on to intermediate position, and flow divider distributes the cold water current to said first and second water pipes on this position.

4. heating system as claimed in claim 3, first water pipe of wherein said cold water waterworks enters said water storage space from the zone line between the zone, said upper and lower.

5. heating system as claimed in claim 4, wherein said first water pipe terminate in and are diffused into the interior device place of water storage tank space central region introducing water.

6. heating system as claimed in claim 1, comprise the shutoff valve and second temperature sensor that are located on the said drainage arrangement, shutoff valve will respond the signal of said second temperature sensor and cut out said drainage arrangement under its control when the hot water temperature who is carried by drainage arrangement surpasses maximum set value.

7. heating system as claimed in claim 1, wherein said heater comprises first electrical heating elements that is arranged in said water storage space lower area and said first electrical heating elements is linked circuit arrangement on the power supply that said circuit arrangement comprises can be at the timing control switch of selected time bar internal cutting off heating element heater.

8. heating system as claimed in claim 7, comprise second electrical heating elements that is arranged in the water storage tank upper area, wherein said circuit arrangement comprises the thermal control commutator, water temperature signal in this switching response water storage tank upper area and the water temperature in the water storage tank upper area drop to minimum setting value joins second heating element heater and power supply when following, makes the disconnection of first heating element heater and power supply simultaneously.

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