JPS6160346B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a system that combines a freezing/refrigeration system and an air conditioning system for a show case, and its purpose is to simplify the system configuration by allowing both systems to share equipment. It's about doing.

To achieve this objective, the system of the present invention includes a condenser that is shared by the refrigeration and freezing systems, the condenser can be used as a heat suction device, and the heating and cooling coil can be used as a condenser during heating. An example of the configuration will be described with reference to the drawings.

In the figure, numerals 1 and 2 are a low-temperature cooler and a medium-temperature cooler of the show case, respectively, and the present invention is also applicable to cases where only one of these is provided. 3 is a heating and cooling coil, and these coolers 1 and 2
Expansion valves 4, 5, and 6 are provided corresponding to the coils 3 and 3, respectively, and a check valve 7 is provided in parallel to the expansion valve 6. 8, 9, and 10 are compressors for freezing, refrigeration, and air conditioning, respectively, and their discharge sides are commonly connected to piping 11.

12 is a condenser common to freezing, refrigeration, and air conditioning, 13
is also a common receiver, and one end of the condenser 12 and the receiver 13 are connected by a pipe 20 having a circuit in which an expansion valve 18 and a check valve 19 are arranged in parallel. End piping 14
and the piping 15 of the heating and cooling coil 3 are the four-way valve 1
7, it is connected to a discharge side pipe 11 common to each compressor or a suction side pipe 16 of a heating and cooling compressor. The receiver 13 and the expansion valves 4 and 5 for the low-temperature cooler and the medium-temperature cooler are connected by a common pipe 21, and the receiver 13
The parallel circuit of the expansion valve 6 and check valve 7 is connected to the piping 22.
connected by.

Next, the operation of this system will be explained. In the four-way valve 17, the refrigerant flows between the pipes 15 and 1 during cooling (summer season) as shown by the solid arrow.
6, 11 and 14 are connected. To explain the flow of the refrigerant during this cooling, the refrigerant liquid in the receiver 13 passes through the pipes 21, 22, and expands through the expansion valves 4, 5,
6, the gas is expanded and vaporized, and sent to the low-temperature cooler 1, medium-temperature cooler 2, and air-conditioning coil 3. In the compressors 8 and 9, the gas coming out of each cooler 1 and 2 is compressed, and the gas coming out of the air-conditioning coil 3 is compressed. is the compressor 1 through piping 15, four-way valve 17, and piping 16.
0 and is compressed. These compressors 8,
The refrigerant gas compressed by 9 and 10 passes through a common pipe 11, a four-way valve 17, and a pipe 14 to a condenser 1.
2 into the receiver 1 through the check valve 19.
Return to 3.

On the other hand, during heating, the four-way valve 17 is switched and the pipes 14 and 16, and 11 and 15 are brought into communication. Thereby, the flow of the refrigerant becomes as shown by the dotted arrow. That is, a part of the refrigerant liquid in the receiver 13 passes through the pipe 21 and passes through the expansion valves 4 and 5, the coolers 1 and 2, and the compressors 8 and 9 in the same manner as described above, but the other part passes through the pipe 20 and passes through the expansion valve 18. It expands here, absorbs heat in the condenser 12, and then flows through the pipes 14,
It is introduced into the compressor 10 through the four-way valve 17 and the piping 16, and is compressed here, and the gas is discharged from the piping 11, the four-way valve 17, and the piping 15 together with the gas discharged from the other compressors 8 and 9.
The refrigerant gas is guided through the air conditioning coil 3 to the heating and cooling coil 3, where the indoor air is heated, and the refrigerant gas itself is liquefied and returned to the receiver 13 through the check valve 7 and piping 22.

As described above, the system of the present invention has a common condenser and receiver for refrigeration, freezing, and air conditioning, and uses piping in which an expansion valve and a check valve are installed in parallel between one end of the condenser and the receiver. The receiver and one end of the air conditioning coil are connected by piping in which an expansion valve and a check valve are installed in parallel, and the other end of the air conditioning coil and the other end of the condenser are connected to each other during cooling and heating. Accordingly, we installed a valve device that switches each compressor to communicate with the common discharge side piping or the suction side piping of the cooling/heating compressor, so the condenser and receiver can be shared for each application, reducing the number of devices. Since the number of refrigerant pipes to the outdoor unit is reduced from six (in the case of the embodiment) or four (in the case where either cooler 1 or 2 is installed) to two, the system configuration is simplified. In addition, waste heat from refrigeration and refrigeration machines is effectively used for heating when air conditioning is used for heating, and the condenser used for air conditioning can be used for refrigeration when air conditioning is not in use. can be used effectively without waste, making it possible to save energy. Furthermore, during heating, the condenser used for freezing and refrigeration can also be used as a heat absorption device, improving heating efficiency. Furthermore, the air conditioner can easily switch between cooling and heating even when the product is being refrigerated or frozen.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of the present invention. 1...Low temperature cooler, 2...Medium temperature cooler, 3
...Coil for heating and cooling, 4 to 6, 18...Expansion valve,
7, 19...Check valve, 8-10...Compressor, 12
...Condenser, 13...Receiver.

Claims (1)

[Claims] 1. Connect the discharge ports of each compressor for freezing or refrigeration in the housing case, and for indoor heating and cooling to a four-way valve using common piping, and connect the four-way valve to a common condenser.
The condenser is connected to the receiver through piping that has an expansion valve with a check valve installed in parallel, and the receiver is connected to a low-temperature cooler for freezing or a medium-temperature cooler for refrigeration in the show case through piping each having an expansion valve, and vice versa. It is also connected to an indoor heating and cooling coil through piping having an expansion valve with a stop valve installed in parallel, and the low-temperature cooler for refrigeration or the medium-temperature cooler for refrigeration is connected to the inlet of each compressor for refrigeration or refrigeration. , the indoor cooling/heating coil is connected to the four-way valve, and the four-way valve is connected to the suction port of the indoor cooling/heating compressor, and the four-way valve supplies refrigerant from the compressor to the condenser during cooling/freezing operation. 2. A show case refrigeration or refrigeration/indoor air conditioning/heating device characterized in that during heating operation, the refrigerant from the compressor can be switched so as to be directly supplied to the indoor air conditioning/heating coil.