JPH0410526Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a water heater with an ice maker that performs ice making operation, ice making hot water operation, and hot water operation in one unit, and in particular, when switching to hot water operation, the compressor This invention relates to a new improvement for ensuring the safety of the compressor by bringing the returned refrigerant to a sufficiently low pressure state.

b. Conventional technology Conventionally, in a water heater with an ice maker that has an auxiliary heat exchanger and is capable of ice making operation, ice making hot water operation, and hot water operation, when switching to hot water operation, the auxiliary heat exchanger connected to the hot water heat exchanger The exchanger was configured to act as an evaporator.

c. Problems to be solved by the present invention In the conventional configuration described above, if the auxiliary heat exchanger had previously acted as a condenser, the condensed and liquefied refrigerant would rapidly return to the compressor, causing If a large amount of liquid refrigerant returns to the inside of the machine, liquid compression will occur and high pressure will be applied directly to the suction side of the compressor, which will lock up the compressor motor and shorten the life of the equipment, as well as damage the compressor. It was also the cause of its own damage.

d Means for solving the problem The purpose of the present invention is to provide an extremely effective means for quickly eliminating the above-mentioned drawbacks, and its gist is to a first valve part connected to the discharge side; a hot water heat exchanger connected to the first valve part and provided in the hot water tank; an auxiliary heat exchanger connected to the hot water heat exchanger; a liquid receiver connected to a heat exchanger;
a first bypass pipe for directly connecting the compressor and the auxiliary heat exchanger; a second bypass pipe having a fourth valve part for directly connecting the hot water heat exchanger and the liquid receiver; a third bypass pipe that directly connects the liquid receiver and the compressor and has a fifth valve part;
an ice-making evaporator connected between the liquid receiver and the compressor and having a throttle device in series; and a timer section connected to the ice storage detector of the ice storage and the fifth valve section; The water heater with an ice maker is configured such that the fifth valve portion is opened in response to a time-up signal, and low-pressure refrigerant is returned to the compressor.

e. Effect Hot water operation is performed by closing the first and second bypass pipes and opening the third bypass pipe,
Ice-making hot water operation is performed by closing the first and third bypass pipes and opening the second bypass pipe, and closing the second and third bypass pipes and opening the first bypass pipe.
While operating the ice making operation with the bypass pipe open,
When switching to hot water operation, the timer section is activated by the output signal of the ice storage detector, and the fifth valve section is opened by the time-up signal of the timer section, and the low-pressure refrigerant is returned to the compressor. It is something.

f. Example Hereinafter, a preferred example of the water heater with ice maker according to the present invention will be described in detail with reference to the drawings.

A tubular first connecting means 3 connected to the discharge side 1a of the compressor 1 and having a first valve part 2 consisting of a three-way valve and a high pressure switch 1c is connected to an inlet side 5a of a hot water heat exchanger 5 in a hot water tank 4. has been done. A water supply pipe 7 having a second valve part 6 consisting of a water valve and a float switch 8 are provided at the top of the hot water tank 4, and an auxiliary heater 9, a hot water temperature detector 10, and a hot water spout are provided at the bottom. 11 is provided, and the outlet side 5 of the hot water heat exchanger 5
b is a tubular second connecting means 14 having a third valve part 12 consisting of a two-way valve and a first throttle device 13 in series;
It is connected to the inlet side 15a of the auxiliary heat exchanger 15 via.

The auxiliary heat exchanger 15 is equipped with a fan 16, and its outlet side 15b is connected to the inlet side 18 of the liquid receiver 18 via a tubular third connection means 17.
connected to a.

Furthermore, the bypass valve 2a of the first valve section 2 is
The second connecting means 1 via the first bypass pipe 19
The second bypass pipe 20 is connected to the branch part 14a of the third connecting means 17 through the fourth valve part 21, and is connected to the branch part 14a of the second connecting means 14. 22.

A third bypass pipe 25 having a fifth valve portion 24 provided in the liquid receiver 18 is connected to the suction side 1b of the compressor 1, and is connected to the liquid receiver 18.
A fourth connecting means 26 connected in parallel with the fifth valve part 24 is provided with an ice-making evaporator 27 and a second throttle device 28 in series, and is adjacent to the ice-making evaporator 27. An ice storage detector 30 is provided in the ice storage 29 provided in the ice storage.

Further, the output signal of the ice accumulation detector 30 is connected to a timer section (not shown), and this timer section starts counting based on the output signal, and the fifth valve section 24 connected to the timer section starts counting. This is a configuration in which opening and closing are performed by a time-up signal.

Next, a case will be described in which the water heater with ice maker according to the present invention is operated in the above configuration. Among the arrows in the drawings, dotted arrow A indicates ice making operation, dashed-dotted arrow B indicates hot water operation, and solid arrow C indicates ice making and hot water operation.

First, to explain the ice making hot water operation (in the case of solid line arrow C), the bypass valve 2a of the first valve part 2
By closing the first bypass pipe 1, opening the fourth valve part 21, and closing the third valve body 12, the first bypass pipe 1
9 is a closed circuit, the second bypass pipe 20 is an open circuit, and the second connecting means 14 is a closed circuit, so that no refrigerant flows into the auxiliary heat exchanger 15. Further, the third bypass pipe 25 is closed by closing the fifth valve portion 24,
During ice making hot water operation, the hot water heat exchanger 5 acts as a condenser, and the air-cooled auxiliary heat exchanger 15 is not used.

That is, the refrigerant discharged from the compressor 1 passes through the first valve part 2 and flows into the hot water heat exchanger 5 provided in the hot water tank 4, but during ice making hot water operation, the inside of the hot water tank 4 is filled with water. Therefore, the high-temperature, high-pressure refrigerant that has flowed into the hot water heat exchanger 5 exchanges heat with water and is condensed and liquefied. That is, the hot water heat exchanger 5 acts as a water-cooled condenser, and at the same time, the water is heated by the latent heat of condensation at this time, and the condensed and liquefied refrigerant passes through the second bypass pipe 20 and enters the liquid receiver 18. is stored in In this case, the second bypass pipe 2
The liquefied refrigerant that has passed through the auxiliary heat exchanger 15
A check valve 29 is provided to prevent water from flowing into the tank. Since the fifth valve body 24 is closed, the refrigerant stored in the liquid receiver 18 does not flow into the third bypass pipe 25, but is depressurized by the second throttle device 28 and passed through the ice-making evaporator 27. The water is evaporated and returned to the compressor 1, and hot water is produced in the hot water heat exchanger 5 and ice is made in the ice making evaporator 27.

When the ice-making hot water operation described above continues, the water in the hot water tank 4 is gradually heated, the hot water temperature becomes high, and at the same time, the condensation pressure of the refrigerant circuit becomes high. Since the relationship between hot water temperature and condensing pressure at this time is proportional, it is necessary to control the hot water temperature so that it does not rise above a predetermined temperature.
In response to a detection signal from a hot water temperature detector 10 provided therein, the ice-making hot water operation is stopped, the first valve section 2 is switched, the first bypass pipe 19 is opened, and the ice-making operation is switched to only the ice-making operation. In this ice-making operation, the refrigerant passes through the system shown by the dotted arrow A.

As described above, when switching to ice-making operation, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 enters the auxiliary heat exchanger 15 after passing through the first bypass pipe 19. Since this auxiliary heat exchanger 15 is an air-cooled heat exchanger, when the refrigerant circuit is switched to ice-making operation, the fan 16 operates and the refrigerant flowing into the auxiliary heat exchanger 15 exchanges heat with the air. The refrigerant is condensed and liquefied, and the condensed and liquefied refrigerant is stored in the receiver 18 , and after being depressurized by the second expansion device 28 , it returns to the compressor 1 via the ice-making evaporator 27 .

Next, when ice making is completed during ice making hot water operation, the completion of ice making is detected by the ice storage detector 30, and this detection signal causes the fourth valve part 21 to close and the third and fifth valve parts 12 and 24 to open. The refrigerant circuit then switches to hot water operation, and the refrigerant circuit becomes the path shown by the dashed line arrow B.

That is, the refrigerant discharged from the compressor 1 passes through the first valve part 2, flows into the hot water heat exchanger 5 provided in the hot water tank 4, exchanges heat with water, and is condensed and liquefied. In other words, this hot water heat exchanger 5 acts as a water-cooled condenser, and the water is heated by the latent heat of condensation at this time, and the condensed and liquefied refrigerant is transferred to the third valve part 1.
2 is open, the pressure is reduced by the first throttle device 13 and the heat enters the auxiliary heat exchanger 15. The fan 16 of this auxiliary heat exchanger 15 is operating, and the refrigerant evaporated in the auxiliary heat exchanger 15 is transferred to the receiver 18 and the third
It is sucked into the compressor 1 through the bypass pipe 25.

The ice making operation, hot water operation, and ice making hot water operation have been explained above, but to further explain the important operations of the present application, during the ice making hot water operation, the ice storage detector 30
When the auxiliary heat exchanger 15 detects ice accumulation and switches to hot water operation, the auxiliary heat exchanger 15 acts as an evaporator at the same time as the detection signal is generated, so if liquefied refrigerant is stored in the auxiliary heat exchanger 15, hot water operation starts. At this time, this liquefied refrigerant returns to the compressor 1, and the third connecting means 17, which has been a high-pressure line until now, becomes a low-pressure line, so there is a possibility that high pressure will suddenly be applied to the suction side 1b of the compressor 1. There is a risk of damage to the compressor 1.
As mentioned above, a means (control circuit unit not shown) for automatically selecting ice making operation, ice making warm water operation, and hot water operation is provided, and switching from ice making hot water operation to hot water operation and from ice making operation to hot water operation is provided. When the fifth valve part 24 is not opened immediately, it is on the low pressure side, that is,
The fifth valve portion 24 is opened after the pressure inside the auxiliary heat exchanger 15 and the liquid receiver 18 becomes sufficiently low. That is, after the ice storage detector 30 detects ice storage, the timer section (not shown) starts operating in response to the ice storage detection signal, and this timer section starts operating for about 1 minute (as a result of an experiment, the third connection When the time for which the inside of the means 17 and the liquid receiver 18 reach a sufficiently low pressure state is counted, the time-up signal opens the fifth valve section 24, preventing high-pressure refrigerant from being drawn into the compressor 1 and discharging the low-pressure refrigerant. is returned.

Furthermore, in the above-mentioned state, the high-pressure refrigerant in the third connecting means 17 and receiver 18 before being changed to low pressure returns to the compressor 1 via the fourth connecting means 26, which is another system. In this case, the second squeezing device 28
After being depressurized through the ice-making evaporator 27, the ice is sucked into the compressor 1, so the compressor 1 is not damaged in any way.

Although the first valve portion 2 in this embodiment is a three-way valve, the same effect can be obtained even if two-way valves are used for the first connecting means 3 and the first bypass pipe 19. , it goes without saying that it is within the scope of the present invention.

g. Effects of the invention Since the present invention has the above-mentioned configuration and operation, the refrigerant load condition when changing from ice making hot water operation to hot water operation, ice making operation to hot water operation, etc. can be controlled by timer section. By reading that the state of the refrigerant has changed to low-pressure refrigerant, the low-pressure refrigerant can be returned to the compressor, thereby preventing damage to the compressor and the entire equipment.

[Brief explanation of drawings]

FIG. 1 is an overall circuit diagram showing a water heater with ice maker according to the present invention. 1 is the compressor, 1a is the discharge side, 1b is the suction side, 2
1 is a first valve part, 2a is a bypass valve, 3 is a first connection means, 4 is a hot water tank, 5 is a hot water heat exchanger, 10 is a hot water temperature detector, 12 is a second valve part, 13 is a first throttle device , 14 is a second connection means, 15 is an auxiliary heat exchanger,
17 is a third connection means, 18 is a liquid receiver, and 19 is a first
Bypass pipe, 20 is the second bypass pipe, 21 is the fourth
A valve part, 24 is a fifth valve part, 25 is a third bypass pipe,
26 is a fourth connection means, 27 is an ice-making evaporator, 28
29 is an ice storage container, and 30 is an ice storage detector.

Claims (1)

[Scope of utility model registration request] A first valve part 2 connected to the discharge side 1a of the compressor 1
a hot water heat exchanger 5 connected to the first valve part 2 and provided in the hot water tank 4; an auxiliary heat exchanger 15 connected to the hot water heat exchanger 5; a connected liquid receiver 18, a first bypass pipe 19 for directly connecting the compressor 1 and the auxiliary heat exchanger 15, and the hot water heat exchanger 5.
and a second bypass pipe 20 that directly connects the liquid receiver 18 and has a fourth valve part 21; and a third bypass pipe that directly connects the liquid receiver 18 and the compressor and has a fifth valve part 24. 25, an ice-making evaporator 27 connected between the liquid receiver 18 and the compressor 1 and having a throttle device 28 in series, and an ice storage detector 3 of the ice storage 29.
0 and a timer section connected to the fifth valve section 24, hot water operation is performed by closing the first and second bypass pipes 19, 20 and opening the third bypass pipe 25, Ice making hot water operation is performed by closing the first and third bypass pipes 19 and 25 and opening the second bypass pipe 20, and closing the second and third bypass pipes 20 and 25 and opening the first bypass pipe. 19 is opened to perform ice making operation, and when switching to hot water operation, the ice storage detector 30
The timer section is activated by the output signal of the timer section, and the fifth valve section 25 is opened by the time-up signal of the timer section, so that the low-pressure refrigerant is returned to the compressor 1. Water heater with ice maker.