JPH0325097Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a refrigeration system, and particularly relates to a refrigeration system that performs both hot water supply and space heating.

(Prior Art) A refrigeration system that performs both heating of hot water supply and space heating using a discharged gas refrigerant as described above is well known, as described in, for example, Japanese Utility Model Application Publication No. 54-95059. . This refrigeration system will be briefly explained with reference to FIG. 1, which is an embodiment of this invention. Connected in series, the first heat exchanger 3 heats the water supplied from the water inlet 5, and takes out hot water from the water outlet 6 and supplies it to the hot water supply side, while the second heat exchanger 4, the water supplied from the water inlet 7 is heated, hot water is taken out from the water outlet 8, and this hot water is supplied to the fan coil or other heating side. And the water outlet 8 of the second heat exchanger 4
is equipped with a temperature measuring element 9 for detecting the temperature of hot water, and when the hot water temperature exceeds a reference temperature, the control means 10 controls the operation of the compressor 1, and the refrigerant from the compressor 1 is controlled. Reduces the discharge capacity of
The temperature of the hot water supplied from the second heat exchanger 4 can be maintained at a predetermined temperature. On the other hand, a three-way valve 11 is connected to the water outlet 6 of the first heat exchanger 3, and a part of the hot water from the water outlet 6 is supplied to the hot water supply user side, while a surplus flow is sent to the water inlet 5. By recirculating the hot water and adjusting the amount of hot water supplied to the hot water supply side, the temperature of the hot water supply can be controlled.

(Problem to be solved by the invention) By the way, in the above-mentioned refrigeration system, the three-way valve 1
1 to increase the temperature of hot water supplied from the first heat exchanger 3, the upper limit is set to the second temperature.
The drawback is that it is limited by the control means 10 on the heat exchanger 4 side. This is because when the temperature of hot water supplied from the first heat exchanger 3 is increased, the condensation temperature of the refrigerant increases accordingly, and as a result, the temperature of hot water from the second heat exchanger 4 rises above the reference temperature. The control means 10 causes the compressor 1 to
This is because the amount of refrigerant discharged from the tank will decrease. Therefore, a temperature measuring element 9 and a control means 1 for controlling the temperature of the hot water supplied from the second heat exchanger 4 are used.
It is also conceivable to provide another set of 0 for hot water supply from the first heat exchanger 3 and switch between them as necessary, but in this case, the device configuration would be complicated, and the device The drawback is that it is expensive.

This invention was made in order to solve the above-mentioned conventional drawbacks, and its purpose is to change the temperature of hot water supplied from the first heat exchanger by changing the temperature of hot water supplied from the second heat exchanger. To provide a refrigeration device which can relax regulations, set hot water supply temperature to a high temperature as required, and has a simple structure and can be constructed at low cost.

(Means for solving the problem) Therefore, in the refrigeration system of this invention, a first heat exchanger 3 and a second heat exchanger 4 are connected in series, and the first heat exchanger 3 is provided with a water inlet 5 and a water outlet 6, and the water outlet 6 is connected to the hot water supply side via a flow rate regulating means 11. In addition, the second heat exchanger 4 is provided with a water inlet 7 and a water outlet 8, and the water outlet 8 is connected to the heating use side. A temperature measuring element 9 that detects hot water temperature as a resistance change, and a control means 10 that controls the capacity of the compressor 1 to reduce the amount of refrigerant discharged from the compressor 1 when the detected temperature exceeds a reference temperature are provided. In the refrigeration system, a resistor 26 is connected to the opening/closing means 2 to shift the detected temperature to a lower temperature side when high-temperature hot water supply is required for the temperature detection element 9.
It is connected via 5.

(Function) In the above-mentioned refrigeration system, the first heat exchanger 3
When trying to increase the temperature of hot water from
The flow rate adjusting means 11 reduces the amount of hot water supplied, and the opening/closing means 25 connects the resistor 26 to the temperature measuring element 9. At this time, as the hot water temperature increases, the temperature of the hot water from the second heat exchanger 4 also increases, but the temperature output from the temperature measuring element 9 side to the control means 10 is 26
This results in a shift to the lower temperature side. In other words, even when the hot water temperature from the second heat exchanger 4 exceeds the reference temperature, a lower temperature is output to the control means 10, and as a result, the compressor is controlled by the control means 10. No. 1 capacity control is performed, and the temperature of hot water supplied from the first heat exchanger 3 can be increased.

(Example) Next, a specific example of the refrigeration system of this invention will be described in detail with reference to the drawings.

First, in FIG. 1, 1 is a compressor, and a first heat exchanger 3 for hot water supply is connected to a refrigerant discharge pipe 2 of this compressor 1, and is further located downstream of the flow of the refrigerant. is connected to a four-way switching valve 12. And this four-way switching valve 12 has three
Main gas pipes 31, 32, 33 are connected.
That is, a first gas pipe 31 connected to the second heat exchanger 4, a second gas pipe 32 connected to the air heat exchanger 16, and a third gas pipe connected to the suction port of the compressor 1. Gas pipe 33 and each gas pipe, and the above-mentioned third
The gas pipe 33 has a sanction accumulator 1.
7 is interposed. Further, the second heat exchanger 4 and the air-to-air heat exchanger 16 are connected by a liquid pipe 34, and the liquid pipe 34 is connected to the cooling air conditioner in order from the second heat exchanger 4 side. expansion valve 19, liquid receiver 1
4. A heating expansion valve 15 is provided. Note that the cooling expansion valve 19 and the heating expansion valve 1
Check valves 13 and 18 are connected in parallel to 5 and 5, respectively.

During the heating operation of the above-mentioned refrigeration equipment, the refrigerant is
The refrigerant discharge pipe 2 passes through the first heat exchanger 3 to the four-way switching valve 12, and then passes through the first gas pipe 31 to the second heat exchanger 4. The liquid then flows through the check valve 13 of the liquid pipe 34, the liquid receiving pipe 14, and the heating expansion valve 15 to the air heat exchanger 16. Thereafter, the gas is returned to the compressor 1 through the second gas pipe 32, the four-way switching valve 12, and the third gas pipe 33. On the other hand, during cooling operation, the refrigerant passes through the first heat exchanger 3 of the refrigerant discharge pipe 2 to the four-way switching valve 12, and then passes through the second gas pipe 32 to the air heat exchanger 16. . The liquid then flows through the check valve 18 of the liquid pipe 34, the liquid receiver 14, and the cooling expansion valve 19 to the second heat exchanger 4. Thereafter, the gas is returned to the compressor 1 through the first gas pipe 31, the four-way switching valve 12, and the third gas pipe 33.

The first heat exchanger 3 is provided with a water inlet 5 and a water outlet 6, the water outlet 6 is connected to a three-way switching valve 11, and one outlet of the three-way switching valve 11 is connected to a pipe 20. through the hot water supply side (not shown)
In addition, the other outlet is connected to the water inlet 5 via a pipe 21. This three-way switching valve 1
1 serves as a flow rate adjustment means for the hot water supply side, which increases the hot water temperature by decreasing the amount of hot water supplied to the hot water consumption side and increasing the amount of circulation to the water inlet 5 side; On the other hand, on the contrary, it increases the amount of hot water supplied to the hot water supply side and decreases the amount of recirculation to the water inlet 5 side, thereby lowering the hot water temperature. The hot water supply temperature is controlled by the controller 22 through the operation of the three-way switching valve 11 as described above. That is, a temperature detector 23 for detecting the hot water temperature is provided on the water outlet 6 side, and the controller 22 compares the set reference temperature with the detected temperature and detects the detected temperature. The operation of the three-way switching valve 11 is controlled so that the hot water supply temperature becomes the reference temperature.

On the other hand, the second heat exchanger 4 includes a water inlet 7,
A water outlet 8 is provided, and the water outlet 8 is connected to the piping 2.
4 to the user side of fan coil etc. (not shown)
It is connected to the. Hot water is supplied from this water outlet 8 during heating operation, and cold water is supplied during cooling operation, but the following explanation is for heating operation. A temperature measuring element 9 for detecting the hot water temperature as a resistance change is provided on the water outlet 8 side, and its temperature signal is outputted to the control means 10. This control means 10
compares the set reference temperature T and the hot water temperature detected above, and the hot water temperature is determined to be the reference temperature T.
When the amount exceeds 1, the slide valve of the compressor 1 is controlled to control the capacity of the compressor 1. Note that the output from the temperature detection element 9 is also input to the controller 22 of the three-way switching valve 11, which controls the water supply temperature to a predetermined temperature by the operation of the three-way switching valve 11. This is because, in other cases, the three-way switching valve 11 may be controlled so that the temperature of the hot water from the second heat exchanger 4 reaches the reference temperature T.

The characteristic feature of this invention is that, as shown in FIG. 2, a resistor 26 is connected in parallel to the temperature measuring element 9 via a switch 25 as an opening/closing means. In this case, the temperature measuring element 9 used has the characteristic that the resistance value increases as the temperature rises, as shown in FIG. This means that the resistance value with respect to temperature decreases, and as a result, the temperature signal output to the control means 10 is shifted to the lower temperature side by the temperature ΔT corresponding to the resistor 26. Note that instead of the above resistor 26,
A variable resistor 27 as shown in FIG. 4 may be used, or if the temperature measuring element 9 has a thermistor-like characteristic in which the resistance value decreases as the temperature rises, a variable resistor 27 as shown in FIG. As shown in FIG. 5, the resistors 26 may be arranged in series.

In the above-mentioned refrigeration system, when the three-way switching valve 11 is operated to increase the hot water supply temperature, the condensation temperature of the refrigerant in the refrigerant discharge pipe 2 increases accordingly,
Therefore, the temperature from the second heat exchanger 4 will also rise. Conventionally, when the hot water temperature exceeds the reference temperature T, the compressor 1 is controlled by the control means 10.
However, in the refrigeration system, when hot water at such a high temperature is required, the switch 25 is closed (the switch 25 is closed). In the case of FIG. 5, it is opened), and the output from the temperature measuring element 9 is shifted to the low temperature side. In this case, the capacity control of the compressor 1 will not be performed until the temperature of the hot water from the second heat exchanger 4 reaches a temperature (T+ΔT) higher than the reference temperature T by the shift amount ΔT. As a result, it becomes possible to raise the temperature of hot water supply more than before. In the above device, when a high hot water supply temperature is not required as described above, the switch 25 is opened (fifth
In the case of a figure, you can close it).

In addition, in the above embodiment, a refrigeration system that performs both heating and cooling is shown, but it is also possible to implement the above in exactly the same way in a system that performs only heating.
In this case, the four-way switching valve 12, the cooling expansion valve 19
etc. are omitted, and two heat exchangers 3,
4 should be interposed.

(Effect of the invention) In the refrigeration system of this invention, the detected temperature of the hot water of the second heat exchanger for starting the capacity control of the compressor is shifted to the lower temperature side by the resistor. , it becomes possible to set the temperature of hot water supplied from the first heat exchanger higher than before. Moreover, in this case, since it is only necessary to connect a resistor or the like to the temperature measuring element, the structure becomes simple and can be constructed at low cost.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of an example of the refrigeration system of this invention.
Figure 2 is an enlarged view of the main parts, Figure 3 is a graph showing an example of the characteristics of the temperature sensing element, Figure 4 is a circuit diagram showing an example of a change in the connection structure of the resistor, and Figure 5 is another change. FIG. 3 is a circuit diagram showing an example. 1... Compressor, 2... Refrigerant discharge pipe, 3... First
Heat exchanger, 4...Second heat exchanger, 5...Water inlet,
6...Water outlet, 7...Water inlet, 8...Water outlet, 9
... Temperature measuring element, 10 ... Control means, 11 ... Three-way switching valve, 15 ... Expansion valve, 25 ... Switch, 2
6...Resistor, 31...First gas pipe, 34...Liquid pipe.

Claims (1)

[Scope of utility model registration request] A first heat exchanger 3 and a second heat exchanger 4 are connected in series to the pipes 2, 31, and 34 through which the discharged refrigerant passes from the compressor 1 to the heating expansion mechanism 15. 3 is provided with a water inlet 5 and a water outlet 6, and the water outlet 6 is connected to the hot water supply side via a flow rate adjusting means 11, and the second heat exchanger 4 is provided with a water inlet 7 and a water outlet 8. is provided, and the water outlet 8 is connected to the heating use side, and the second heat exchanger 4 is also connected to the heating side.
A temperature measuring element 9 detects the hot water temperature on the water outlet 8 side as a resistance change, and the capacity of the compressor 1 is controlled to reduce the amount of refrigerant discharged from the compressor 1 when the detected temperature exceeds a reference temperature. In the refrigeration system, a resistor 26 is connected to the temperature measuring element 9 via the opening/closing means 25 to shift the detected temperature to a lower temperature side when hot water supply at a higher temperature is required. A refrigeration device characterized in that it is connected to