JPH0357394B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety valve operation confirmation device for a refrigeration system that quickly detects the operation of a safety valve in a refrigeration system and minimizes leakage of refrigerant gas from the refrigeration system. .

Conventionally, the main equipment of refrigeration equipment is equipped with a safety valve to protect the equipment and peripheral equipment and ensure safe operation when a pressure higher than the planned pressure is applied.
However, as shown in Fig. 3, this type of safety valve has safety valve main valves 8a, 9 in the condenser 4, liquid receiver 5, etc.
discharge ports 8b of safety valves 8 and 9 connected via a;
9b and released into the atmosphere from the outlet relief pipe 10, it is difficult to confirm the operation of the safety valve, and appropriate measures cannot be taken quickly, resulting in a large amount of refrigerant gas leaking. Also, due to the structure of the safety valve, once it operates, it may not be completely closed.If the safety valve temporarily operates and the refrigeration equipment continues to move, the working refrigerant gas circulating within the refrigeration equipment may This had major drawbacks, such as a small amount of refrigerant leaking into the atmosphere through the safety valve, resulting in a refrigerant gas shortage without anyone noticing.

However, in the present invention, a tank is provided in the outlet relief pipe of the safety valve, so that the operation of the safety valve and the slight leakage of refrigerant gas from the safety valve can be quickly detected. Appropriate measures such as replenishment can be taken. Reference will now be made in detail to the accompanying drawings, which illustrate embodiments of the invention.

Reference numeral 1 designates a known refrigeration system in which a compressor 2, an oil separator 3, a condenser 4, a liquid receiver 5, an expansion valve 6, and an evaporator 7 are piped as shown. 8,
Reference numeral 9 designates a known safety valve, which is connected to the condenser 4 and the liquid receiver 5 through safety valve main valves 8a and 9a, respectively. Reference numeral 10 denotes an outlet relief pipe, which is connected to the outlet ports 8b and 9b of the safety valves 8 and 9, and is connected to the outlet ports 8b and 9b of the safety valves 8 and 9.
b, 9b are combined into one.

Example 1 This example is as shown in Fig. 1.
Reference numeral 1 denotes a tank which is connected to the tip of the outlet relief pipe 10 and is used to stop the leaked refrigerant gas when the safety valves 8 and 9 are activated. 12 is a constant pressure valve,
It is connected to the tip of the tank 11, and the tank 1
When the pressure inside 1 exceeds a certain value (0.2 to 0.3 Kg/cm ² ), it opens and releases the refrigerant gas into the atmosphere. 13 is a pressure detection device, which detects a constant pressure (0.1
The pressure switch is connected to ^the tank 11 via a valve 13a. A signal board 14 is equipped with a lamp, a buzzer, etc., and emits a signal indicating the operation of the safety valves 8 and 9, and is connected to the pressure detection device 13 to confirm the operation of the safety valves 8 and 9.

Example 2 This example is as shown in Figure 2.
Reference numeral 5 designates a tank, which has an outlet relief pipe 10 and a constant pressure valve 12 at the tip, similar to the tank 11.
It is attached and installed consecutively. Reference numeral 16 designates a pressure switch similar to that described above, which is connected to the tank 15 via a valve 16a. Reference numeral 17 denotes a refrigerant gas detection sensor, which is installed inside the tank 15.
A signal board 18 is similar to the signal board 14, and is connected to the pressure switch 16 and the refrigerant gas detection sensor 17. Reference numerals 19 and 20 denote cleaning valves, which are installed in the tank 15 and at the connection between the outlet 9b of the safety valve 9 and the outlet relief pipe 10, respectively, and are used to clean the refrigerant gas in the tank 15.

The present invention has the above-described configuration, and when first using the first embodiment, if the pressure in the refrigeration system 1 rises to a predetermined pressure for some reason, either or both of the safety valves 8 and 9 are closed. is activated. When the safety valve is activated, the refrigerant gas is discharged from the outlet 8.
b, 9b and the tank 11 through the outlet relief pipe 10.
If the refrigerant gas accumulates in the refrigerant gas, the operation of the safety valve can be immediately detected by the pressure detection device 13, and appropriate measures such as replenishment of refrigerant gas can be taken, so that a shortage of refrigerant gas will never occur.

Next, when using the second embodiment, when the safety valve operates as in the first embodiment, the discharge port 8b,
9b and the outlet relief pipe 10, the refrigerant gas accumulates in the tank 15 and is detected by both the pressure switch 16 and the refrigerant gas detection sensor 17. At this time, if there is a slight leak due to failure of the safety valve to close, etc., even if it cannot be detected by the pressure switch 16, it can be detected by the refrigerant gas detection sensor 17, and the signal on the signal board 18 indicates whether the safety valve is activated. It is also possible to distinguish whether it is a leak or not. Furthermore, after confirming the leakage, measures can be taken to promptly replace the safety valve. Further, after activation of the safety valve or confirmation of leakage, fresh air is allowed to flow into the outlet relief pipe 10, tank 15, etc. through the cleaning valves 19 and 20 for recycling.

[Brief explanation of drawings]

The attached drawings show embodiments of the present invention, and the first
The figure shows the block piping and wiring diagram of the first embodiment, and the second figure shows the block piping and wiring diagram of the second embodiment.
FIG. 3 is a conventional block piping diagram. 1... Refrigeration system, 2... Compressor, 3... Oil separator, 4... Condenser, 5... Liquid receiver, 6
...expansion valve, 7...evaporator, 8,9...safety valve,
8a, 9a... safety valve main valve, 8b, 9b... discharge port, 10... outlet relief pipe, 11... tank, 12
...Constant pressure valve, 13...Pressure detection device, 13a...
Valve, 14... Signal board, 15... Tank, 16...
Pressure switch, 16a... Valve, 17... Refrigerant gas detection sensor, 18... Signal board, 19, 20...
Cleaning valve.

Claims (1)

[Claims] 1. A tank is provided at the tip of the outlet relief pipe of the safety valve of the refrigeration system, and a constant pressure valve is provided at the tip of the tank,
A safety valve operation confirmation device for a refrigeration system, characterized in that a pressure detection device is attached to the tank and connected to a signal board. 2. A tank is provided at the tip of the outlet relief pipe of the safety valve of the condenser and receiver of the refrigeration system, a constant pressure valve is provided at the tip of the tank, a pressure switch is attached to the tank, and a refrigerant gas sensor is installed inside the tank. 1. A safety valve operation confirmation device for a refrigeration system, characterized in that a sensor is provided, the tank is equipped with a cleaning valve, and the pressure switch and refrigerant gas detection sensor are connected to a signal board.