JPS60134167A - Changeover device for refrigerant flow path - 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 Field of the Invention The present invention relates to a refrigerant flow switching device for a refrigerator-freezer or the like having two evaporators.

Conventional configuration and its problems Solenoid valves have traditionally been used as refrigerant flow switching devices.

Pressure-type on-off valves have been mainly used, but in recent years, refrigerant flow switching devices that utilize the paper lock phenomenon within the refrigerant flow path have been attracting attention from the viewpoint of quietness and simplification of the device. be.

The simplest and most typical example of a refrigerant flow switching device that utilizes this phenomenon will be explained below. Figure 1 shows a conventional paper lock type refrigerant flow switching device and a refrigerator-freezer to which it is applied. This shows the refrigerant circuit. In Fig. 1, a is a compressor controlled by a freezer thermostat (not shown) that detects the temperature of the freezer compartment, and normally the refrigerant is transferred to the condenser b The first one has a squeezing action.
Through capillary d, refrigerator compartment evaporator e1 freezing compartment evaporator f
and cooled at the same time. Next, when the refrigerator compartment temperature falls below the set temperature, the refrigerator compartment thermostat (not shown) energizes the heater q to heat the lower outlet vibe h of the paper lock type refrigerant flow switching device C. Air bubbles form in the pipes and the flow of refrigerant is blocked. However, since liquid refrigerant continues to be supplied to the condenser side and into the paper lock type refrigerant flow switching device C, the liquid level in the paper lock type refrigerant flow switching device C rises, and after a certain period of time, finally reaches the lower end of the upper lobe 5, and the refrigerant passes through the second capillary j and is supplied to the freezer compartment evaporator f to cool only the freezer compartment.

In this way, the conventional paper lock type refrigerant flow switching device switches the refrigerant flow path, but the problem is that after the heater q is energized, the liquid level rises and the upper outlet vibrator 1 It takes too long for the liquid level to reach
This means that the responsiveness of refrigerant flow path switching is poor. One way to improve this is to increase the insertion distance of the upper outlet vibrator i into the device, but if the insertion distance is too large, the tip of the upper outlet vibrator i will always be below the liquid level. In a situation where it is impossible to switch the refrigerant flow path, there is a limit to the insertion cost.

OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention provides a refrigerant flow switching device with good responsiveness.

Structure of the Invention In order to achieve this object, the refrigerant flow switching device of the present invention has the following features:
The inside of the refrigerant flow switching device is divided into two upper and lower chambers by a partition plate, and a cylinder housing a float valve is provided below the partition plate, and the two chambers above and below the partition plate are connected via this cylinder.
It is made by connecting rooms. Then, the lower outlet passage of the refrigerant flow switching device is heated by the heater, a paper lock occurs, and when the liquid level rises, the float valve rises and closes the valve seat of the cylinder. Since the liquid refrigerant is supplied to the upper chamber of the partition plate even if the refrigerant is not filled with liquid, the liquid level rises to the lower end of the upper outlet vibe and the refrigerant flow path is switched in a very short time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is a compressor, 2 is a condenser, 3 is a paper lock type refrigerant flow switching device, 4 is a first capillary, and 6 is a
6 is an evaporator for the refrigerator compartment, and 6 is an evaporator for the freezer compartment. Also, 7
9 is an upper outlet vibrator for supplying refrigerant to the freezer compartment cooler 6 when the heater 8 is energized, and 9 is a second capillary, and the basic configuration of the refrigerant circuit is almost the same as that of the conventional example.

Next, in the refrigerant flow switching device 3, the inside of the cylindrical container is divided vertically into two chambers A and B 12 by a partition plate 10, and a float valve 13 is installed on the bottom surface of the partition plate 1o. A housed cylinder 14 is provided, and a valve seat 1 is provided on the upper part of the cylinder 14.
6 is provided, and this cylinder 14 allows the A chamber 1°1.
Room B 12 is in communication. 16 is a refrigerant inlet vibe, 1
7 is a lower outlet vibe for refrigerant.

The operation of refrigerant flow path switching in the refrigerant circuit configured as described above will be described below.

First, when the temperature of the refrigerator compartment is higher than the set temperature, the heater 8 is not energized by the refrigerator compartment thermostat (not shown), so no air bubbles are generated in the refrigerant lower outlet vibe 1a.
The liquid level in the paper lock type refrigerant flow switching device is low, the float valve 13 is located below, and the A chamber 11 and the B chamber 12 are in communication with each other. Therefore, the liquid refrigerant flowing in from the refrigerant inlet vibrator is in the A chamber 11. Room B12. The refrigerant is supplied to the refrigerator compartment evaporator 5 and the freezer compartment evaporator 6 through the lower outlet vibrator 17 and the first capillary 4 to cool them.

Next, when the temperature of the refrigerator compartment falls below the set value, the refrigerator compartment thermostat energizes the heater 8 and heats the refrigerant lower outlet vibrator 17, which generates bubbles and blocks the flow of refrigerant. be done. Then, the liquid level in the B chamber 12 rises, causing the float valve 13 to float, and even though the B chamber 12 is not full of liquid, the valve seat 15 is closed, and refrigerant is supplied to the A chamber 11. 11 and the tip of the upper outlet vibe 7 is small, the liquid level reaches the tip of the upper outlet vibe 7 in a short time, the refrigerant is supplied to the upper outlet vibe 7, and the refrigerant flow path is switched. It is done.

As described above, in this embodiment, the interior of the refrigerant flow switching device is divided into upper and lower halves, and the float valve 13 divides the inside of the refrigerant flow path switching device into upper and lower halves.
Since the communication hole 2 is closed, it is not necessary to fill the refrigerant from the bottom of the cylindrical container 3' to the tip of the refrigerant upper outlet pipe 7, as in the conventional case, and the lower chamber B 12 is filled with liquid. Even if it is not full,
The refrigerant flow path is switched. Therefore, compared to the conventional method, the switching time of the refrigerant flow path is significantly shortened.

Effects of the Invention As described above, the present invention divides the inside of a cylindrical refrigerant flow switching device into two upper and lower chambers by a partition plate, and a cylinder housing a float valve that communicates and shuts off the upper and lower two chambers in the partition plate. Because it is installed, if the lower outlet vibe is heated by the heater and vapor lock occurs, the float valve will rise and cut off communication between the upper and lower chambers, even if the lower chamber is not full. The liquid refrigerant accumulates quickly in the upper chamber, and therefore the time required to switch the refrigerant flow path can be shortened, and the effect of eliminating the situation in which it becomes impossible to switch the flow path as in the past can be achieved. It is something.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram including a conventional refrigerant flow switching device, and FIG. 2 is a refrigerant circuit diagram including a refrigerant flow switching device showing an embodiment of the present invention. 3... Refrigerant flow path switching device, 3'... Oil container, 16... Refrigerant artificial vibe, 7...
... Refrigerant upper outlet vibrator, 8 ... Heater, 10
...Partition plate, 13...Float valve, 1
4...Cylinder, 17...Refrigerant lower outlet vibe.

Claims (1)

[Claims] A cylindrical container having a refrigerant artificial vibrator and a refrigerant upper outlet vibrator in the upper part, and a refrigerant lower outlet vibrator in the lower part, and a partition plate that divides the inside of the cylindrical container into two upper and lower chambers,
A refrigerant flow switching device comprising a cylinder housing a float valve for communicating and blocking the two chambers installed on the lower surface of the partition plate, and a heater installed in the lower refrigerant outlet vibrator.