JPS59157462A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigeration system that uses a refrigerant such as chlorofluorocarbon gas, and relates to the removal of water contained in a cold sore.

[Technical background of the invention and its problems]

FIG. 1 shows an example of the configuration of a conventional refrigeration system. A refrigerator (1) consisting of a compressor, a condenser, a receiver tank, an accumulator, etc., an expansion valve (3), a refrigeration section (4), and this 1. A dryer (2) is provided in the middle of the refrigerant pipe (5) of the refrigeration system, which is constituted by a refrigerant pipe (5) that connects the two in a closed loop.

The dryer (2) has a moisture adsorbent such as silica gel, molecular sieves, and activated alumina sealed therein, and the dryer (2) has a water absorbent such as silica gel, molecular sieves, activated alumina, etc. It plays the role of adsorbing and removing moisture contained in refrigerants such as fluorocarbon gas. In refrigeration systems that use refrigerants such as fluorocarbon gas, if the moisture in the refrigerant increases due to moisture remaining in the refrigerator or piping, or moisture entering from outside during operation, it may cause damage to throttle parts such as the expansion valve (3). It will precipitate and turn into ice, causing blockages and making it impossible to maintain normal refrigeration function.To prevent this, dryers (
2) is provided.

However, the water removal function of existing dryers has limitations, which is a factor that determines the performance and maintainability of refrigeration equipment. Here, an example of the functions of an existing dryer is shown below.

i [Moisture adsorption capacity: up to about 18% of the moisture absorption agent weight (6) Moisture removal capacity: about 30 ppm with crabmolecular sieves (weight ratio) 1 Among the above functions [':a], the adsorbed moisture is saturated If so, you will need to remove the dryer and replace it with a new one.

Further, the function port is an element that determines the lower limit of the temperature of the freezing section (4). The moisture content in the refrigerant is determined by the dryer's capacity, and when this moisture content exceeds the saturated moisture content of the refrigerant at a given temperature, an amount of moisture corresponding to the difference precipitates in the refrigerant, forming ice. As a result, the refrigerant flow rate decreases because the refrigerant adheres to the throttle part, and furthermore, trouble occurs in which the throttle part is blocked and the refrigerant stops flowing.

Taking Freon R502 as an example, the saturated moisture content at -50°C is about 24 ppm, and the moisture content in the medium is limited to 30 ppm by the dryer's ability. When cooled to 50℃,
There was a problem in that water equivalent to 330-24 = 6pp precipitated in the squeezed portion and turned into ice, blocking it.

[Purpose of the invention]

The present invention solves the drawback that in the prior art, the lower limit of the freezing temperature in a refrigeration apparatus is limited by the moisture removal ability of a dryer, and provides a refrigeration apparatus that can significantly lower the limit of the cooling temperature that can be achieved. The purpose is to

[Summary of the invention]

This 7-engine rJA is a refrigeration system in which a refrigerator, an expansion valve, and a refrigeration part are connected in a closed loop with a refrigerant pipe, and the refrigerant part is cooled by the refrigerant flowing in the refrigerant pipe. A refrigeration system is provided, comprising a bypass pipe provided therein, and an extremely low temperature cold trap provided in the middle of the bypass pipe for extracting moisture in the refrigerant flowing through the bypass pipe, The desired objective was achieved by removing moisture from the cold coal to a much lower level than conventional dryers.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

? Figure 2 shows the configuration of a refrigeration system according to the present invention. In addition to the conventional refrigeration system, which is composed of a refrigeration em, an expansion valve (3), a refrigeration section (4), and a refrigerant pipe (5) that connects these in a closed loop, a refrigerant pipe (5) is installed before the expansion valve (3). ), a bypass pipe (1, 81) is provided, an airtight container (10) is placed in the middle of the bypass pipe (1, 81), and a cold trap ring is attached therein via a backing 116) with bolts 05). cold trap (
11) There are 9 volumes of liquid in 1. Its role is to lower the temperature of the pipe wall of the cold trap to an extremely low temperature. +61. +71. (7') is a stop valve for switching the flow of refrigerant to bypass piping 0■, (8) is a drain valve for releasing the moisture collected in cold trap 01) from inside the bypass piping, (91 is piping An external vacuum pump (stop valve (14 is a pressure gauge), which is heard when vacuuming the inside, heater 03 installed in the cold trap cap) removes the refrigerant that adheres to the outer wall of the cold trap. This is for melting and vaporizing water. Also, a heater (1η) installed at the bypass pipe (marked 1) after passing through the cold trap circle (11) is used to heat the refrigerant cooled in the cold trap circle to almost room temperature. It is for heating.

In the refrigeration system of the present invention, which is configured as described above, the stop valve (6) is opened during normal operation,
With the stop valves (7) and (7') closed, the refrigerant circulates in a closed loop through the same path as in a conventional refrigeration system.

If you want to remove the moisture in the refrigerant to a low concentration, close the stop valve (6), open the stop valve (71, (7'), and transfer the refrigerant to the airtight container (10) through the bypass pipe (1).
) into the cold trap 01). The outer wall of the cold trap o11 is cooled by the liquid nitrogen (14) contained therein to a temperature near the temperature (-195°C) of liquid nitrogen.

When a refrigerant containing moisture hits the outer wall of this cold trap (1), the moisture precipitates and forms ice, which adheres to the outer wall. The refrigerant from which water has been removed is heated to almost the same temperature by the heater UN, returns to the main pipe (5), and circulates within the refrigeration system. After continuing to operate in this state for a while and removing moisture in the refrigerant, the stop valve (6) is opened and the stop valves (7) and (7) are opened.
') close. The water separated from the refrigerant is now collected in the bypass pipe, mainly in the airtight container (1Ce).

Next, vaporize the liquid nitrogen using a heater (+3),
Next, the wall surface of the cold trap OD is heated to dissolve the attached moisture (ice) into the refrigerant in the bypass pipe, and the stop valve (9) is opened to release the refrigerant into the outside air.

If necessary, connect the stop valve (9) line to the 9 pump (1).
If you subtract by 9, the moisture in the bypass piping will be removed to an even lower level. Moreover, if the refrigerant in the bypass pipe is discharged from the drain valve (8) instead of the stop valve (9), moisture that cannot be dissolved in the refrigerant can be discharged to the outside of the system.

Thus, moisture within the closed loop of the refrigeration system can be vented out of the loop, and moisture within the loop can be kept at low levels (a few ppm).

The refrigeration system according to the present invention passes a refrigerant through bypass piping,
Even when moisture collection is being carried out, the operation of the refrigeration system does not occur due to IE, and the refrigeration section (4) can maintain normal refrigeration operation. In addition, only a small amount of refrigerant is lost when water is released from the system, so it must be replenished as needed.1. Bye.

〔Effect of the invention〕

As detailed above, according to the present invention, a bypass pipe is provided in the refrigerant pipe before the expansion valve in the refrigeration system, and a cold trap using liquid nitrogen is provided in the middle of the bypass pipe, and the cryogenic cold trap is used to immerse the refrigerant in the refrigerant pipe. Since the water content in the refrigerant is removed, the water content in the refrigerant can be lowered to a much lower level than when using a dryer. As a result, the temperature of the freezing section of this refrigeration system can be stably cooled to a much lower temperature than that of a conventional system using only a dryer. The refrigeration function can be maintained normally even during water removal operations without stopping the operation of the refrigeration equipment. Furthermore, the only consumables are liquid nitrogen and a refrigerant for the small bones, and the water removal operation can be repeated.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing the configuration of a conventional refrigeration system, and Figure M2 is a system diagram showing the configuration of the refrigeration system according to the present invention. 1... Refrigerator 3... Expansion valve 4... Refrigeration part 5... Refrigerant piping 6, 7.7', 9...
・Stop valve 10... Airtight container 11... Cold trap 13... Heater 14... Liquid nitrogen 17
... Heater 18 ... Bypass piping agent Patent attorney Inoue - Male No. 111A

Claims (3)

[Claims] (1) In a refrigeration system that connects a refrigerator, an expansion valve, and a refrigeration part in a closed loop with a refrigerant pipe, and cools the refrigeration part by the refrigerant flowing in the refrigerant pipe, the refrigerant pipe is provided in the refrigerant pipe before the expansion valve. A refrigeration system comprising a bypass pipe and an extremely low temperature cold trap provided in the middle of the bypass pipe to extract water from a refrigerant flowing through the bypass pipe. (2) The refrigeration system according to claim 1, wherein the cold trap has a heater for melting and vaporizing the collected moisture. (3) Have a heater for heating the refrigerant in the refrigerant pipe after passing through the gold trap? I? The refrigeration device 1 according to claim 1 or 2, defined as R? .