JPH03241273A - Dehydrater for freezing cycle - Google Patents

Abstract

PURPOSE:To facilitate detaching and changing of a one-touch dryer by coupling a dryer to a jointing member arranged between a receiver and an expansion valve through a pair of quick joints. CONSTITUTION:A dehydrater 1 consists of a jointing member 5 interposed between a receiver 3 and an expansion valve 4 of a freezing cycle 2 for vehicle, a dryer 6 connected to the jointing member 5, and a quick joint 7 which has a pair of refrigerant leakage preventing mechanisms and connects the jointing member 5 and the dryer 6. The dryer 6 contains drying agent 15 sealingly for removing water contained in refrigerant within a container 14 having a refrigerant inlet 14a and a refrigerant outlet 14b, and is arranged upward of the jointing member 5 through the quick joint 7. Thus the detaching and changing of the dryer 6 can be easily with one-touch operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a dehydrating device for a refrigeration cycle for removing moisture contained in a refrigerant circulating in the cycle.

[Prior Art 1] In a vehicular refrigeration cycle, a certain amount of desiccant is sealed in a receiver in order to remove moisture during the cycle.

If the moisture absorption capacity of the desiccant decreases and moisture enters the refrigeration cycle, there is a risk that it will corrode various functional parts or freeze at the expansion valve nozzle, obstructing the flow of refrigerant. .

Therefore, conventionally, the receiver filled with the desiccant has to be replaced when the vehicle body is inspected.

Alternatively, in Japanese Utility Model Application Publication No. 63-92170 or No. 63-34969, a dryer containing a desiccant is provided separately from the receiver body, and the dryer is detachable from the side or bottom of the receiver body. A possible assembly technique is disclosed.

[Problem to be Solved by the Invention 1] However, in the conventional technology in which a dryer is assembled to enable deinking, it is necessary to perform the following two steps when replacing the dryer.

First, before removing the dryer, vent the gas in the refrigeration cycle. Next, after replacing the dryer, the inside of the refrigeration cycle is evacuated. Then, it is filled with refrigerant gas.

In this way, conventionally, when removing and replacing the dryer,
The problem was that it required very laborious work.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide a dehydrator for refrigeration cycles that eliminates the need to vent gas in the refrigeration cycle and allows for easy removal and replacement of the dryer (with one touch). The goal is to provide equipment.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention employs the following technical means.

Disposed between the receiver and the expansion valve of the refrigeration cycle,
an inlet refrigerant passage having one end communicating with the downstream refrigerant pipe of the receiver and the other end opening to the outside, and one end communicating with the upstream refrigerant pipe of the valve to the 1fill and the other end opening to the outside. A joint member in which an outlet side refrigerant passage is formed, a dryer in which a desiccant is sealed in a container in which a refrigerant inlet and an outlet are defined, and the other end side of the inlet side refrigerant passage and the outlet side refrigerant. Consists of one joint connected to the other end of the passage, and the other joint connected to the inlet and outlet of the dryer, respectively, and the one joint and the other joint can be attached and detached with one touch. A pair of refrigerant leak prevention devices installed in 11! It consists of a structured quick joint.

[Operation] In the present invention having the above configuration, the dryer is connected to a joint member disposed between the receiver and the expansion valve of the refrigeration cycle via a pair of quick joints.

The joint member has one joint connected to the other end of the artificial side refrigerant passage and the outlet side refrigerant passage, and the dryer has the other joint connected to the inlet and outlet formed in the container. It is connected.

The dryer can be replaced by attaching and detaching the dryer by attaching and detaching one joint and the other joint with a single touch.

[Effects of the Invention] According to the present invention having the above-mentioned effects, the dryer can be removed and replaced using a pair of quick joints with a refrigerant leakage prevention mechanism, so when replacing the dryer, gas can be removed from the refrigeration cycle. There is no need to do this. Additionally, the dryer can be easily attached and replaced with one touch.

[Example] Next, a dehydrating device for a refrigeration cycle according to the present invention will be described based on an example shown in the drawings.

FIG. 1 shows a partial sectional view of a dehydrating device for a refrigeration cycle.

The refrigeration cycle dehydrator 1 of this embodiment includes a joint member 5 interposed between a receiver 3 and an expansion valve 4 of a vehicle refrigeration cycle 2, a dryer 6 connected to the joint member 5, and a dryer 6 connected to the joint member 5.
It consists of a pair of quick joints 7 with a refrigerant leak prevention mechanism that connect the joint member 5 and the dryer 6.

As shown in FIG. 2, the refrigeration cycle 2 includes a refrigerant compressor 10 driven by a driving engine 9 via an electromagnetic clutch 8, a refrigerant condenser 11, the above-mentioned receiver 3 and expansion valve 4, and a refrigerant evaporator 12. etc., each having a well-known configuration connected in an annular manner by a refrigerant pipe 13.

The joint member 5 is installed at a position higher than the receiver 3 in the vertical direction, and communicates with an inlet refrigerant passage 5a that communicates with an outlet pipe (downstream refrigerant pipe) 13a of the receiver 3 and an upstream refrigerant pipe 13b of the expansion valve 4. Outlet side refrigerant passage 5
b is formed.

The inlet a refrigerant passage 5a and the outlet refrigerant passage 5b each have a bent passage shape, and one end of each is connected to the outlet pipe 13a of the receiver 3 and the upstream refrigerant pipe 13b of the expansion valve 4, Each other end is opened above the joint member 5, respectively.

The dryer 6 is a container 14 in which a refrigerant inlet 14a and an outlet 14b are formed, and a desiccant 15 for removing moisture contained in the refrigerant is sealed in the container 14. It is installed above the joint member 5.

The desiccant 15 is held by a filter 16 fixed to the container 14. Additionally, inside the container 14, there is a dryer, as shown in FIG. A partition plate 11 is provided to partition the center part of the agent 15 halfway.

The surface of the desiccant 15 is coated with paint (which changes color depending on the moisture concentration).
For example, cobalt chloride) is applied.

Therefore, the moisture absorption ability of the desiccant 15 can be measured according to the degree of discoloration of the paint.

For this purpose, a sight glass 18 is fitted into the center of the top surface of the container 14 via a gasket for observing the discoloration state of the paint applied to the desiccant 15 6 Quick joint 7 allows one joint 7a and the other joint 7b to be attached and detached with one touch, and when one joint γa and the other joint 7b are separated, they are sealed together with both joints 1 to 7a and 7b. Monitor until tlI when leakage of C1 refrigerant can be prevented. Note that FIG. 1 shows a coupled state of a quick joint 7 having a well-known structure.

In this embodiment, one joint 7a is connected to each other end of the inlet side refrigerant passage 5a and the outlet side refrigerant passage 5b formed in the joint member 5, and the dryer 6
An inlet 14a and an outlet 14 formed in the container 14 of
The other joint 7b is connected to each joint 7b.

Next, the operation of this embodiment will be explained.

Due to the operation of the refrigeration cycle 2, the liquid refrigerant flowing out from the receiver 3 passes from the inlet side refrigerant passage 5a of the joint member 5 through the quick joint 7 that connects the artificial side refrigerant passage 5a and the inlet 14a of the dryer 6. , is guided to the dryer 6.

In the dryer 6, moisture is removed from the liquid refrigerant flowing from the inlet 14a toward the outlet 14b while coming into contact with the desiccant 15 due to the hygroscopic action of the desiccant 15 sealed in the container 14. At this time, by providing the partition plate 11 in the center of the container 14 to regulate the flow of the refrigerant (indicated by the arrow in FIG. 1), the contact between the refrigerant and the desiccant 15 moves to the right, and the refrigerant Dehumidification is carried out effectively.

The dehumidified refrigerant passes through the quick joint 7 that connects the outlet 14b of the dryer 6 and the outlet refrigerant passage 5b of the joint member 5, and flows out from the outlet refrigerant passage 5b toward the expansion valve 4.

In the above process, when the moisture absorption ability of the desiccant 15 decreases, the moisture concentration within the refrigeration cycle 2 increases, causing the paint applied to the surface of the desiccant 15 to change color. Since this state can be observed and identified through the sight glass 18 fitted into the top surface of the container 14 of the dryer 6, it is possible to appropriately know when to replace the dryer 6.

To remove and replace the dryer 6, after separating one joint 7a and the other joint 7b of the quick joint 7 with a single touch, replace the dryer 6 with a new one.
This is done again by connecting one joint 7a on the joint member 5 side and the other joint +-7b on the new dryer 6 side with one touch.

In removing and replacing the dryer 6, the quick joint 7 is equipped with a refrigerant leak prevention mechanism, and when one joint 7a and the other joint 7b are separated, both joints 7a and 7b are sealed. There is no need to vent gas in the refrigeration cycle 2 before separating the joints 7a and 7b.

Furthermore, by assembling the joint member 5 at a higher position than the receiver 3, when the refrigerant compressor 10 is stopped, the liquid refrigerant that was present inside the dryer 6 located above the joint member 5 and inside each quick joint 7 is removed. Since the refrigerant flows downward by gravity, only the gas refrigerant remains inside the dryer 6 and inside each quick joint 7.

Therefore, even when removing the dryer 6, the refrigeration cycle 2
All you need to do is remove a very small amount (1~2g or less) of the refrigerant inside.

By evacuating the new dryer 6 for replacement and filling the interior with a small amount of refrigerant, refrigerant can be replenished into the refrigeration cycle 2 at the same time.

As described above, in this embodiment, when the dryer 6 is to be removed and replaced, there is no need to vent the gas in the refrigeration cycle 2 in advance, and the removal and replacement can be easily performed (with one touch). Further, by introducing the joint member 5 at a higher position than the receiver 3, when the dryer 6 is removed, only a very small amount of gas refrigerant needs to be drained.

In addition, when replacing the dryer 6, if you forget to attach the dryer 6 and operate the refrigeration cycle 2, a low pressure switch (not shown) installed between the dryer 6 and the fj expansion valve 4 will be activated. Therefore, the refrigeration cycle 2 can be stopped immediately.

Further, the dryer 6 may be repurposed by heating (for example, by flowing dry high-temperature air) to remove moisture. 6 A modification of the present invention is shown in FIGS. 3 and 4.

FIG. 3 is a sectional view of the dryer, and FIG. 4 is a perspective view showing the internal structure of the container.

This modification is an example in which a part of the flange portion of the receiver 3 (not shown) is used as the joint member 5.

As shown in FIG. 3, the desiccant 15 is sealed in a container 14 partitioned by a partition plate 17 disposed in the center, and held by two upper and lower filters 20.16.

As shown in FIG. ,
A cylindrical portion 21 is provided for passing liquid refrigerant from the inlet 14a (l[ll) to the outlet 14b side.

Therefore, flow passage holes 21a and 21b are formed in the side surface of the cylindrical portion 21 on the inlet 14a side and the outlet 14b side, respectively, through which the liquid refrigerant passes. and cylindrical part 2
A paint (cobalt chloride) for detecting the water concentration contained in the refrigerant is applied to the inner surface of the center of the refrigerant.

Note that no paint is applied to the desiccant 15.

A sight glass 18 is fitted into the center of the top surface of the container 14. This sight glass 18 is provided for the purpose of observing the paint and checking the amount of refrigerant charged in order to know when to replace the dryer 6 according to the degree of discoloration of the paint applied inside the cylindrical part 21. It is being

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a partial sectional view of a dehydrating device for a refrigeration cycle, and FIG. 2 is a diagram of a refrigeration cycle. 3 and 4 show a modification of the present invention, in which FIG. 3 is a sectional view of the dryer, and FIG. 4 is a perspective view showing the internal structure of the container. In the figure 1... Dehydration device for refrigeration cycle 2... Refrigeration cycle 3... Receiver 4...
Expansion valve 5...Joint member 5a...Inlet side refrigerant passage 5b...Outlet side refrigerant passage 6...Dryer 7...Quick joint 7a...One joint 7b...1 side joint 13a・
・・Outlet piping (downstream refrigerant piping) 13b...” 1st flow 1
111+Refrigerant piping 14... Container 14a... Inlet 14b... Outlet 15... Desiccant

Claims (1)

[Scope of Claims] 1) (a) An inlet side disposed between a receiver and an expansion valve of a refrigeration cycle, one end communicating with a refrigerant pipe downstream of the receiver, and the other end opening to the outside. refrigerant passage,
and (b) a container having a refrigerant inlet and an outlet formed therein. (c) one joint connected to the other end of the inlet-side refrigerant passage and the other end of the outlet-side refrigerant passage, respectively, an inlet of the dryer and the dryer; A dewatering device for a refrigeration cycle, comprising a pair of quick joints with a refrigerant leak prevention mechanism, the other joint being connected to the outlet of the refrigerant, and the one joint and the other joint being detachable with a single touch.