JPS6144123Y2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to an improved structure for a refrigeration system in which an air-cooled condenser and a water-cooled condenser are connected in series.

The condenser in conventional refrigeration equipment consisted only of air-cooled condensers or water-cooled condensers,
There has been a demand for a refrigeration system that can be used by automatically switching between an air-cooled type, a water-cooled type, or an air-water-cooled type depending on the surrounding conditions in which the refrigeration system is installed. For example, when the ambient temperature is low, you may want to use an air-cooled type because it has enough heat exchange capacity and there is no risk of freezing, and when the ambient temperature rises, you may want to automatically switch to a water-cooled type. This invention relates to a refrigeration system in which an air-cooled condenser and a water-cooled condenser are installed on a frame and connected in series in a refrigerant circuit. An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, 1 is a refrigerant compressor, 2 is an air-cooled condenser, 3 is a blower, 4 is a double-pipe water-cooled condenser, 5 is a first refrigerant passage, 6 is a second refrigerant passage,
7 is a solenoid valve for oil cooler bypass, 8 is a solenoid valve for water circuit, 9 is a liquid reservoir, 10 is an oil cooler, 11
1 is a liquid outlet operating valve, 12 is a throttle device, 13 is a cooler, and 14 is an inlet operating valve.

In Figures 2 and 3, 21R ₁ is the solenoid valve 8.
, 52F is the coil part of the contactor of blower 3, 21R ₂ is the coil part of solenoid valve 7, 23
R is a temperature sensing element that senses the ambient temperature and opens and closes the contacts, 52C is a coil portion of a contactor of a compressor motor, 15 is an a contact of the contactor, and 16 is a b contact of a safety device.

In Fig. 2, when the outside temperature is low, the contact point of the temperature sensing element 23R is connected to the coil portion 52F, 21R ₂
is closed to the excitation side, and the unit becomes air-cooled.
Refrigerant gas discharged from the compressor 1 is guided to an air-cooled condenser 2, where it is forcibly cooled by a blower 3 and liquefied. The refrigerant liquid flows through the pipe of the water-cooled condenser 4, is guided from an intermediate position of the condenser 4 to the first refrigerant passage 5, passes through the open bypass solenoid valve 7, and then passes through the second refrigerant passage 5. The refrigerant passes through the refrigerant passage 6, flows through the water-cooled condenser 4 again, and is stored in the liquid reservoir 9.
Note that at this time, since the compressor 1 is arranged so as to be forcibly cooled by the blower 3, there is no need to flow liquid refrigerant to the oil cooler 10.

Next, when the outside temperature rises, the contact of the temperature sensing element 23R closes to the side that excites the coil portion _21R1 .
The solenoid valve 8 opens, cooling water flows into the water circuit, the unit becomes water-cooled, and the refrigerant gas discharged from the compressor 1 radiates heat naturally in the air-cooled condenser 2, and then flows into the double-pipe water-cooled condenser 4. guided by. Then, the refrigerant liquefied by heat exchange with the cooling water is transferred to the bypass solenoid valve 7.
Since the refrigerant is closed, it flows into the oil cooler 10 in the compressor 1 through the first refrigerant passage 5 to lower the oil temperature at the bottom of the shell, and then flows back into the water-cooled condenser through the second refrigerant passage 6. The liquid is supercooled by exchanging heat with the cooling water in the liquid reservoir 9 and stored in the liquid reservoir 9. In addition,
In the case of the water-cooled type described above, since the blower 3 is stopped as described above, the compressor 1 is not cooled by it, so the bypass solenoid valve 7 is closed and the entire amount of refrigerant is circulated to the oil cooler 10. I try to let it flow. Further, the liquid refrigerant stored in the liquid reservoir 9 passes through the liquid outlet operation valve 11, is depressurized by the throttling device 12, and evaporates in the cooler 13, after which it passes from the suction pipe to the suction port operation valve 14, and is then inhaled by the compressor 1. It is returned to the mouth.

In the above-mentioned method, air-cooled type and water-cooled type are used depending on the change in outside temperature, but in another embodiment of the present invention, as shown in Fig. 8, the blower 3 is used together with the compressor 1.
ON and OFF, and when the outside temperature rises above a predetermined temperature, the water circuit solenoid valve 21R ₁ is activated by the temperature sensing element 23R.
is opened and air-water cooled to lower the condensing temperature, while
Bypass solenoid valve _21R2 is closed, liquid refrigerant is guided to oil cooler 10, and compressor 1 is cooled. When the outside air temperature is lower than a predetermined temperature, only the air cooling system is used, and the compressor 1 is cooled only by fan cooling by the blower 1, without flowing cooling water to the water-cooled condenser 4, nor flowing liquid refrigerant to the oil cooler 10. You can do it like this.

Furthermore, in the above embodiment, a water circuit solenoid valve is used as the water circuit control valve, but a water saving valve can be used instead of the water circuit solenoid valve 8 to save a large amount of cooling water when the high pressure side pressure increases. It is also possible to use a sink air/water cooling type, and when the pressure on the high pressure side decreases, the cooling water is stopped and only the air cooling type is used. Bypass solenoid valve 7
There is also a method of closing when the system is air-water cooled using a temperature sensing element, and allowing refrigerant to flow through the oil cooler to cool the compressor, or opening when only air cooling is used, and cooling the compressor with fan cooling.

As described above, this invention detects the ambient temperature in which the refrigeration equipment is installed using a temperature sensing element, and when the ambient temperature is lower than a predetermined temperature, only air cooling is used, and the compressor 1 is cooled by the blower 3. The bypass solenoid valve 7 is opened so that liquid refrigerant does not flow into the oil cooler 10 of the compressor 1. On the other hand, if the ambient temperature is higher than the specified temperature, a water-cooled type or an air-water cooled type is used, and the compressor 1
The bypass solenoid valve 7 is closed to allow liquid refrigerant to flow into the oil cooler 10.

Therefore, according to this invention, air-cooled operation, water-cooled operation, or air-water-cooled operation is automatically performed in response to changes in ambient temperature, so when the ambient temperature rises, the pressure on the high pressure side becomes abnormally high, and the compressor This eliminates problems such as shutting down due to high-pressure switches. In addition, whether it is an air-cooled type or a water-cooled type, it is not only possible to effectively cool the refrigerant compressor, but also has an extremely simple configuration and has excellent practical effects that can be provided at low cost. .

It goes without saying that the same effect can be achieved by detecting the condensing temperature or condensing pressure instead of sensing the ambient temperature.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram showing an embodiment of this invention, and FIGS. 2 and 3 are sequence diagrams for its control. In the figure, 1 is a refrigerant compressor, 2 is an air-cooled condenser, 3 is a blower, 4 is a water-cooled condenser, 5 and 6 are refrigerant passages, 7 is a bypass solenoid valve, 8 is a water circuit solenoid valve, 10 is an oil cooler, and 23R is a temperature sensing element.

Claims (1)

[Claims for Utility Model Registration] (1) A first refrigerant passage that guides the discharge gas of the refrigerant compressor to the oil cooler of the compressor via an air-cooled condenser and a water-cooled condenser connected in series thereto. A bypass solenoid valve is provided between the oil cooler and a second refrigerant passage leading to the water-cooled condenser, and a water circuit control valve is provided in the middle of the water pipe of the water-cooled condenser, and , equipped with an element that senses the condensing temperature or condensing water force,
When the outside air temperature, condensation temperature, or condensation pressure drops below a predetermined value, the water circuit control valve is closed to operate the air-cooled condenser, and the bypass solenoid valve is released to cool the compressor using the blower. When the outside air temperature, condensation temperature, or condensation pressure becomes higher than a predetermined value, the bypass solenoid valve is closed and the water circuit control valve is opened to operate only the water-cooled condenser or the air-cooled condenser. 1. A refrigeration system comprising: a control circuit which operates together with the compressor and cools the compressor by flowing a liquid refrigerant through an oil cooler of the compressor. (2) The refrigeration system according to claim 1, wherein the water circuit control valve is a water circuit solenoid valve. (3) The refrigeration system according to claim 1, wherein the water circuit control valve is a water-saving valve that operates according to the pressure on the high pressure side of the refrigeration cycle.