WO2014101397A1

WO2014101397A1 - Instantaneous water heater

Info

Publication number: WO2014101397A1
Application number: PCT/CN2013/079871
Authority: WO
Inventors: 陈建亮
Original assignee: Chen Jianliang
Priority date: 2012-12-25
Filing date: 2013-07-23
Publication date: 2014-07-03
Also published as: CN103900250A

Abstract

An instantaneous water heater utilizing a heat pump for heating, comprising a controller, a water path, and two or more heat pump cycle loops. The water path comprises sequentially in the direction of water flow: a water inlet (6), a heating part (4), and a water outlet (5). The heat pump cycle loops comprise: compressors (1a), evaporators (2a), and condensers (3a). The compressors (1a) are connected to the controller. The condensers (3a) are thermal-conductively in contact with the heating part (4) in the water path. The controller is for use in: determining the states of the compressors (1a) and starting up or shutting down the compressors (1a), and, if the compressors (1a) are in a non-operating state, and the time interval from the previous startup is greater than a preset value, then determining that the compressors (1a) are standby compressors, otherwise, determining that the compressors (1a) are non-standby compressors. When the controller starts up the compressor (1a), a compressor is selected from the standby compressors to be started up.

Description

Instant water heater

The invention relates to an instant water heater, and to a water heater which is heated by a heat pump. Background

Usually, the instant water heater is also called a fast or fast-heating water heater. Its characteristics ^ cold water and hot water are discharged. As long as the water outlet valve is opened, the energy source continuously supplies hot water in a short time. When no hot water is used, the water outlet valve is closed. The water can be stopped in a short time by cutting off the water path. The current instant water heaters are mostly electric heating and gas.

The principle of the electric heating type instant water heater is to rapidly heat the cold water flowing through the heating zone with a relatively high-power electric heater, so that the predetermined use temperature is quickly reached, and the cold water is supplied to the hot water for the purpose of cancellation. The water storage device on the heat storage type water heater (for example, the volume of the water storage device of the household electric water heater is generally up to several tens of liters), so the volume is small and the installation is convenient. Moreover, since it is not necessary to heat the stored water in the water storage device to a certain temperature before use, the water consumption is not limited by the storage water amount and temperature, and can be used immediately, so it is more convenient than the heat storage type water heater. Moreover, its ready-to-use features eliminate the need to heat and store the stored water during standby, which greatly saves energy consumption and is more energy-saving and environmentally friendly.

However, the electric heating type instant water heater does not have installation conditions in some circuit environments due to its high power, and its heat conversion efficiency is not satisfactory due to the characteristics of electric heating.

Gas-fired hot water heaters are also widely used, but the gas (natural gas, liquefied petroleum gas or water gas) used is non-renewable energy, so it is a waste of valuable natural resources, and gas-fired water heaters are not fully burned. For other reasons, there is a risk of carbon monoxide poisoning.

Air energy water heaters, also known as air source heat pump water heaters, are a type of water heater that has sprung up in recent years. The principle is to use the refrigerant in the heat pump of the water heater to absorb the low-temperature heat energy in the air, and then convert it into high-temperature heat energy after compression by the compressor, thus The water is heated. Due to the heat transfer by the heat pump, the water heater has the characteristics of high efficiency and energy saving. It has been reported that its energy saving effect is four times that of the electric water heater and three times that of the gas water heater.

The air energy heat pump heating system used in the existing air energy water heater generally consists of three parts. - is the main part, the second is the water tank part, the third is the heating system part; for the household type water tank, ! The capacity is generally 150-320L. The water tank is bulky. It needs to occupy a large part of the building area when installing. Even if some water tanks are installed outside the wall by brackets, this type of installation is quite dangerous due to the weight of the water tank itself. 2. The material and process used in the tank liner itself, whether it is a stainless steel liner or an enamel liner, due to defects in the manufacturing process, water tank leakage is difficult to avoid; 3. The heat exchanger inside the tank generally uses copper tubes. Or stainless steel pipe, in areas with poor water quality, the heat exchange pipe will be rotted and perforated, resulting in cold leakage. Once the leakage occurs, it will be fatal to the unit; 4. The connection between the main unit and the water tank is required. This is difficult to avoid the artificial leakage of refrigerant during installation; 5, due to the characteristics of the storage heat pump, the water temperature needs to be raised to a higher temperature, and the time required is longer, can not meet the immediate water requirements, and to the late water use The water temperature fluctuates greatly, which affects the comfort of use; in addition, the condensing temperature determines the energy consumption of the unit, the traditional belt The unit of the box runs for a long time under high condensing temperature and high condensing pressure, which will be a big test for the life of the compressor. 6. Use a water storage type water tank. When using water, it is necessary to mix water. One problem, 1) the hot water usage rate in the water tank is not high; 2) the water tank is inevitably lowered in the heat preservation time, and the water temperature is inevitably decreased, increasing the energy. 3) When the user installs the water valve, the mixing valve must be installed. Material costs. 7. When the general heating system takes the heat in the water tank, it is necessary to install a heat exchange coil inside the water tank, and form a closed loop with the floor heating coil or the radiator and the circulating water pump, which increases the difficulty of the water tank production process and also occupies the Water tank capacity.

Therefore, various water heater solutions in the industry currently have incomplete principle defects. Summary of the invention

It is an object of the present invention to provide an instant water heater that utilizes a heat pump for heating.

In order to achieve the above object, the present invention provides an instant water heater comprising a controller, a water circuit and more than two heat pumps circulating back;

The waterway includes, in order of water flow direction, a water inlet, a heating part and a water outlet;

The heat pump circulation circuit includes: a compressor, an evaporator, and a condenser, wherein the compressor is connected to the controller, and the condenser is in heat conduction contact with the heating portion in the water path;

The controller is configured to: determine a state of the compressor and turn the compressor on or off, and determine the state of the compressor as: if the compressor is in an inoperative state, and the time from the last shutdown If the interval is greater than the preset value, the compressor is judged to be the standby compressor, otherwise the compressor is judged to be the non-standby compressor; when the controller turns on the compressor, the compressor is selected to be turned on in the standby compressor.

As a parallel scheme of the above solution, in some cases, when the compressor state is judged, the comparison of the preset time includes the current number, that is, if the compressor is in an inoperative state, and the time interval from the last shutdown is greater than or equal to The preset value determines that the compressor is a standby compressor, otherwise it is determined that the compressor is a non-standby compressor.

Preferably, the instant water heater further includes a first water outlet temperature sensor and an electric heating device; the electric heating device is disposed between the water outlet of the waterway and the heating portion, and the first outlet water temperature sensor is disposed in the waterway for heating Between the part and the electric heating device.

The first outlet water temperature sensor is connected to the controller for detecting the outlet water temperature of the water flowing out of the heating portion in the water passage;

The electric heating device is for heating a fluid in a waterway;

The controller is further configured to: when the first outlet water temperature sensor detects that the outlet water temperature is lower than the set outlet water temperature, turn on the electric heating device to heat the water flow in the waterway.

Preferably, the instant water heater further comprises a second outlet water temperature sensor, and the second outlet water temperature sensor is disposed between the electric heating device and the water outlet in the waterway.

The second outlet water temperature sensor is connected to the controller for detecting the outlet water temperature of the water flowing out of the electric heating device in the waterway;

The controller is configured to adjust the power of the electric heating device based on the temperature detected by the second outlet water temperature sensor.

Preferably, the controller is configured to turn on more compressors when the electric heating device is heated at maximum power, but the temperature detected by the second outlet water temperature sensor is lower than the set temperature. Connected to the controller to detect the water flow velocity in the waterway;

The controller is configured to turn on the compressor when the water flow sensor detects that the water flow velocity in the waterway is greater than a preset value.

Preferably, the instant water heater further includes an inlet water temperature sensor, and the inlet water temperature sensor is connected to the controller, and is configured to detect an inlet water temperature of the water flow in the waterway; The controller is configured to calculate a compressor to be turned on according to the required outlet water temperature and water output amount, combined with the inlet water temperature fed back by the inlet water temperature sensor, and turn on the corresponding compressor.

Preferably, the number of the heat pump circulation circuits is two.

Because the water heater often encounters the problem of opening the waterway or closing the waterway when switching the waterway, the hot water heater is different from the heat storage water heater, and does not have a large-capacity water storage device, so the hot water heater is The heating device often needs to be frequently turned on or off, and the air pump can provide the heat source by the heat pump cycle. The refrigerant fluid in the heat pump circulation circuit after the shutdown needs a certain time to achieve the pressure balance, if the pressure of the refrigerant fluid in the circuit has not reached the equilibrium. At this time, the compressor is quickly turned on, which is very harmful to the equipment, and the work effect is not good. The instant water heater of the invention has more than two heat pump circulation loops. When the compressor needs to be turned on, the compressor state needs to be judged first. If the compressor just shuts down, the shutdown time has not yet reached the preset time. , then the compressor is a non-standby compressor, the controller does not choose to open the compressor, only the time interval is not working and the time interval from the last shutdown is greater than the preset value (or greater than or equal to the preset value) The compressor is the standby compressor, which is an alternative compressor that can be turned on. Thus, the present invention solves the problem that the instant water heater needs to supply hot water in real time by setting a plurality of heat pump circulation loops and whether it is a judgment mechanism of the compressor to be used, and can solve the problem that the compressor frequency switch is set when the hot water supply state is switched. The problem of damage.

The instant water heater of the present invention is different from the heat storage heat pump water heater. The water storage heat pump water heater is statically heated most of the time, so when the heat pump system is working, most of the time is at a higher condensation temperature (or condensing pressure), and this paper The instant water heater adopts dynamic heating mode when using water, and the condensing temperature (or condensing pressure) is low during operation, so the heat pump efficiency is higher, the heat pump system does not operate too badly, and the life of the compressor is longer. Enclosed description

1 is a schematic view showing the structure of a hot water heater module in a specific embodiment of the present invention;

Fig. 2 is a schematic view showing the structure of a hot water heater in the embodiment of the present invention.

Label description:

La, compressor, 2a, evaporator: 3a, condenser, 7a, throttling device,

Lb , compressor, 2b, evaporator 3b, condenser, 7b, throttling device, 4, heating section, 5, water outlet, 6, water inlet, 14, motor, 15, fan,

9, gas-liquid separator, 10, filter, 11, expansion valve, 17, pressure relief capillary,

8, the first outlet temperature sensor, 12, water flow sensor, 13, electric heating device, 18, the second outlet temperature sensor, 19, the inlet temperature sensor,

201, shower, 202, bath rainbow 203, water outlet valve, 204, inlet valve. detailed description

The detailed description of the technical contents, structural features, objects and effects of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, the embodiment provides an instant water heater, characterized in that

The waterway according to the direction of the water flow (indicated by the arrows in Figs. 1 and 2) includes: the water inlet 6, the heating portion 4 and the water outlet 5;

The first heat pump circulation circuit includes: a compressor la, an evaporator 2a, a condenser 3a, a throttle device 7a, and a second heat pump circulation circuit including: a compressor lb, an evaporator 2b, a condenser 3b, a throttle device 7b, a compressor La, lb are connected to the controller, and the condensers 3a, 3b are in thermal conduction contact with the heating portion in the water path; the condenser is in thermal contact with the heating portion, and the condenser can be placed in the heating portion directly with the water in the space inside the heating portion The heat exchange is performed by heat conduction; the condenser may be attached to the outer wall of the heating part pipeline or the container, and the heat exchange may be performed by the heat conduction between the pipeline and the outer wall, which may be a plate heat exchanger or a coil heat exchanger. Device.

In some embodiments, the throttling device includes an expansion valve 11 or a pressure relief capillary 17, and a gas-liquid separator 9 and a filter 10 are disposed in the heat pump circulation circuit.

In the embodiment shown in Fig. 2, the water inlet 6 is connected to the inlet valve 204, and the outlet 5 is connected to the outlet valve 203. The outlet valve can be connected to external water components such as the shower 201 or the bath 202.

In some embodiments, to facilitate heat exchange of the evaporator, a fan 15 and a motor 14 that rotates the fan are also provided, the motor being controlled by the controller. In order to facilitate installation, save space and reduce the number of devices, the evaporators 2a, 2b are arranged in the same air duct. The controller is configured to: determine a state of the compressor and turn the compressor on or off, and determine the state of the compressor as: if the compressor is in an unoperating state, and the time interval from the last shutdown is greater than the pre- If the value is set, the compressor is judged to be the standby compressor, otherwise the compressor is judged to be the non-standby compressor; when the controller turns on the compressor, the compressor is selected to be turned on in the standby compressor.

For example, the preset value is 1 minute, the first compressor is 30 seconds from the last shutdown, and the second compressor is 5 minutes from the last shutdown. Therefore, the second compressor is the standby compressor, and the first compressor is not waiting. Use a compressor. At this time, if the compressor needs to be turned on, the controller will turn on the second compressor, and after 30 seconds, it is possible to turn on the first compressor as needed.

In some embodiments, when the compressor state is judged, the comparison of the preset time includes the current number, that is, if the compressor is in an inoperative state, and the time interval from the last shutdown is greater than or equal to the preset value, then the judgment is made. The compressor is a standby compressor, otherwise it is judged that the compressor is a non-standby compressor.

In some embodiments, the instant water heater further includes a first outlet temperature sensor 8 and an electrical heating device! 3; The electric heating device 13 is disposed between the water outlet port 5 and the heating portion 4, and the first outlet water temperature sensor 8 is disposed between the heating portion 4 and the electric heating device 13 in the water path.

The first outlet water temperature sensor 8 is connected to the controller for detecting the outlet water temperature of the water flowing out of the heating portion in the water passage;

The electric heating device 13 is configured to heat the fluid in the waterway;

The instant water heater further includes a second outlet water temperature sensor 18, the second outlet water temperature sensor! 8 is disposed between the electric heating device 13 and the water outlet 5 in the waterway, wherein the second outlet water temperature sensor is connected to the controller for detecting the outlet water temperature of the water flowing out of the electric heating device in the waterway;

When the first outlet water temperature sensor 8 detects that the outlet water temperature is lower than the set outlet water temperature, the controller turns on the electric heating device 13 to heat the water flow in the water passage, and the controller according to the second outlet water temperature sensor! 8 The detected temperature adjusts the power of the electric heating unit. The electric compensation heating allows for a more flexible adjustment of the outlet water temperature to compensate for the problem of insufficient heating when the operable compressor is insufficient. When the electric heating device 13 is heated at the maximum power, but the temperature detected by the second outlet water temperature sensor 18 is lower than the set temperature, more compressors are turned on.

In some embodiments, the instant water heater is provided with a water flow sensor 12, and the water flow sensor 12 is disposed in the waterway and connected to the controller for detecting the water flow speed in the waterway; When the water flow sensor 12 detects that the water flow speed in the water path is greater than a preset value, the controller turns on the compressor. The preset value of the water flow rate can be 0 or other values. When the preset is 0, if the flow of water is detected, the controller will turn on the compressor. In order to prevent the interference signal, the preset value can also be a value greater than zero.

In some embodiments, the instant water heater further includes an inlet water temperature sensor 19 disposed between the water inlet 6 and the heating portion 4, the inlet water temperature sensor 19 being coupled to the controller for detecting water flow in the waterway Inlet temperature

The controller is configured to calculate a compressor to be turned on according to the required outlet water temperature and water output amount, combined with the inlet water temperature fed back by the inlet water temperature sensor, and turn on the corresponding compression: machine. Turn on the corresponding compressor, depending on the amount of heat required, select the appropriate compressor in the compressor with different power, or you can choose to open multiple compressors. This can be adjusted according to the set procedure and the parameters of the compressor. Set of.

This is due to the fact that there are multiple compressors in the system. When the system load is not large, it is not necessary to turn them all on to save energy and reduce equipment loss. More importantly, some of the compressors are not operated and become the compressors to be used. In order to prepare the compressors for the current operation, after the compressors need to be turned on in a short time, they can be used at any time, so that multiple compressors take turns. Work, can solve the problem of frequent switching of water heaters. When there is more hot water required, or the inlet water temperature is lower, and the hot water supply is insufficient, the controller opens multiple compressors to generate more heat.

In other embodiments, the number of heat pump circuit loops may be three, four or more, arranged in parallel, in accordance with the spirit of the present invention, to work in concert.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present invention.

Claims

claims

1. An instant water heater, characterized by including a controller, an ice circuit and more than two heat pump circulation loops;

The water path includes: water inlet, heating part and water outlet in order according to the direction of water flow;

The heat pump circulation loop includes: a compressor, an evaporator, a condenser, and a throttling device. The compressor is connected to a controller, and the condenser is in thermal conductive contact with the heating part in the ice circuit;

The controller is used to: judge the status of the compressor and turn on or off the compressor. The judgment of the status of the compressor is: if the compressor is not running, and the time interval since the last shutdown is greater than a predetermined time. If the set value or the time interval from the last shutdown is greater than or equal to the preset value, the compressor is judged to be a standby compressor, otherwise the compressor is judged to be a non-standby compressor; and when the compressor needs to be turned on, the compressor is judged to be on standby. Select Compressor to turn on the compressor.

2. The instant water heater according to claim 1, characterized in that, the instant water heater further includes a first outlet water temperature sensor and an electric heating device;

The electric heating device is disposed between the water outlet and the heating part in the water path, and the first water outlet temperature sensor is disposed between the heating part and the electric heating device in the water path;

The first outlet water temperature sensor is connected to the controller and is used to detect the outlet temperature of the water flowing out of the heating part in the water path;

The electric heating device is used to heat the fluid in the waterway;

The controller is also used to turn on the electric heating device to heat the water flow in the waterway when the first outlet water temperature sensor detects that the outlet water temperature is lower than the set outlet water temperature.

3. The instant water heater according to claim 2, characterized in that, the instant water heater further includes a second outlet water temperature sensor, and the second outlet water temperature sensor is arranged between the electric heating device and the water outlet in the waterway. between,

The second outlet water temperature sensor is connected to the controller and is used to detect the outlet water temperature of the water flowing out of the electric heating device in the waterway;

The controller is used to adjust the power of the electric heating device according to the temperature detected by the second outlet water temperature sensor.

4. The instant water heater according to claim 3, characterized in that the controller is used to: when the electric heating device is heated at maximum power, but the temperature detected by the second outlet water temperature sensor is still lower than When setting the temperature, switch on more compressors.

5. The instant water heater according to claim 1, characterized in that, the instant water heater is provided with a water flow sensor, and the water flow sensor is arranged in the water path and connected to the controller, and is used to detect the water flow in the water path. speed;

The controller is used to start the compressor when the water flow sensor detects that the water flow velocity in the waterway is greater than a preset value.

6. The instant water heater according to claim 1, characterized in that, the instant water heater further includes an inlet water temperature sensor, the inlet water temperature sensor is connected to the controller and is used to detect the flow of water in the waterway. Inlet water temperature;

The controller is used to calculate the compressor that needs to be turned on based on the required outlet water temperature and volume, combined with the inlet water temperature fed back by the inlet water temperature sensor, and turn on the corresponding compressor.

7. The instant water heater according to any one of claims 1 to 6, characterized in that the number of heat pump circulation loops is two.