JPS5862463A - 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 The present invention relates to a refrigeration system using a rotary compressor, and is intended to save energy.

27.,-- Rotary compressors are widely used in room air conditioners in Japan because of their high efficiency and small size. On the other hand, for small compressors such as household refrigerators, reciprocating compressors have traditionally been more efficient in terms of processing accuracy, but with recent improvements in processing and design technology, rotary compressors have become more efficient even in the field of small compressors. Rice has become highly efficient. However, although a calorimeter test of a rotary compressor alone showed an efficiency improvement of about 20% compared to a reciprocating type, when actually installed in a household refrigerator, T I 5
When measured in the power consumption test of C960 electric refrigerators and electric freezers, the effect was halved to about a 10 factor reduction in power consumption at most. According to research conducted by the present inventor, the cause of this is that when the rotary compressor is stopped, excessive superheat gas that remains in the closed container flows into the evaporator, heats the evaporator, and becomes a heat load on the refrigerator. be. The flow has two paths; the first path flows into the mechanda chamber of the compression element, and the yarn path flows into the evaporator via the suction line.
The second circuit is a circuit in which the gas flows from the sealed container to the condenser, radiates heat in the condenser, becomes superheated gas at room temperature, and flows into the evaporator via the capillary tube.

The degree of influence of the superheat gas is on the first circuit, which has a high degree of superheating. As a general method for this improvement, a check valve is appropriate for the first circuit, and a solenoid valve that responds to the operation and stop of the compressor for the second circuit. This method has drawbacks such as the electromagnetic valve is expensive, consumes power, has a complicated electric circuit, and produces operating noise.

In view of the above drawbacks, the present invention aims to provide an energy-saving refrigeration system that is inexpensive, does not require electrical control, is quiet, and has an efficiency equal to or higher than that of a single compressor. It is.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 denotes a rotary compressor, which is comprised within a closed container 2 of a compression element 3 and an electric element (not shown). Furthermore, there is no check valve on the low pressure side inside the closed container. Refrigerant 1d lz - IJ - Compressor 1, condenser 4, first capillary tube 5a, inlet chamber 6a of fluid control valve 6, second capillary tube 5b, evaporator 7, refrigerant from evaporator 7 to suction line 9 A refrigeration cycle is constructed by sequentially connecting a check valve 8, a suction line 9, and a rotary compressor 1 in an annular manner, which opens when the fluid flows.

Note that the outlet chamber 6b of the fluid control valve 6 is connected to the suction line 9 via a branch pipe 9a. The fluid control valve 6 has an outer shell 1 formed by an inlet housing 1o and an outlet housing 11.
2 to maintain airtightness. An inlet pipe 10a, an outlet pipe iob, and a plunger 14 to which a ball valve 13 is fixed are slidably guided in the inlet side housing 1o,
It has a communication passage 1oC that communicates the inlet chamber 6a and the outlet chamber 6b, and a valve seat 10d. Further, a ball valve 13 is installed on the outlet chamber 6b side of the plunger 14 with a valve seat 1.
When the spring 14a has a force in the direction of closing by contacting the od, and the ball valve 13 is opened, the inlet chamber 6a and the outlet chamber 6b are closed.
It has a ring-shaped sealing material 14b that blocks the passage. On the other hand, the outlet side housing 11 has a pressure introduction pipe 11a for introducing suction pressure. Further, the outlet side housing 11 is formed at the boundary between the lower part of the communication passage 10c of the inlet chamber 6a and the upper part of the outlet chamber 6b so as to function as a retainer to restrict excessive movement of the plunger 14. .

Inlet chamber pressure is applied to the tip of the plunger 14, and outlet chamber pressure and the force of the spring 14a are applied to the rear end of the plunger 14, respectively.

Note that the gap between the inside of the communication passage 10c and the outside of the granger 14 communicates the inlet chamber 6a and the outlet chamber 6b, but the flow resistance for passing through this gap is greater than the flow resistance of the evaporator 7. It is formed to be much larger.

Next, the effect will be explained. 6 at the start of operation
First, as shown in FIG. 1, the high-temperature, high-pressure refrigerant discharged from the rotary compressor 1 radiates heat in the condenser 4, becomes a high-pressure liquid refrigerant, and passes through the capillary tube 5a. However, at this time, the plunger 14 in the inlet chamber 6a of the fluid control valve 6 is pushed up toward the inlet 6a, and the ball valve 1
3 is pressed against the valve seat 10a, the capillary tube 5 does not act as a pressure reducing device, but becomes a mere communication pipe, and the high pressure liquid refrigerant is introduced into the inlet chamber 6a, and the inside of the inlet chamber 6a becomes high pressure. Become. Also, since the rotary compressor 1 is being operated at this time, the suction line e
The pressure inside is also low. As a result, the plunger 14
The tip of the plunger 14 faces the inlet chamber 6a, and the rear end of the plunger 14 faces the outlet chamber 6b.
4a, the plunger 14 is pushed down toward the outlet chamber 6b by this pressure difference, the Borl valve 13 and the valve seat 10d are opened, and the second capillary tube 5b, It flows into the evaporator 7. For any refrigerant flow, check valve 8 is open 77. - The normal refrigerant circulation state is established, and the first capillary tube 5a and the second capillary tube 6b act as a normal depressurization and evaporation device (the state shown in FIG. 2). Therefore, the pressure in the inlet chamber 6a of the fluid control valve 60 becomes the pressure reduced by the first capillary tube 5a, and becomes higher than the pressure in the outlet chamber 6b, which has the same pressure as the evaporator 7, so that the rotary compressor 1 is operated. Inside, the pressure in the inlet chamber 6a is never lower than that in the outlet chamber 6b, so there is no possibility that the plunger will be pushed up and the valve closed. Next, we will discuss the effect when stopped. When the rotary compressor 1 stops, the high-temperature, high-pressure refrigerant gas in the closed container 2 flows into the cylinder chamber (not shown) through the mechanical seal of the compression element 3, and flows into the suction line 9.
through which it flows back to the check pulp 8. This backflow causes the check pulp 8 to close, so the pressure in the suction line 9 rapidly increases until it becomes equal to the pressure in the closed container 2, and the pressure in the outlet chamber 6b connected to the suction line 9 also increases. rise rapidly.

However, at this time, the pressure within the inlet chamber Qa does not rise rapidly due to the resistance of the first capillary tube 5a. Therefore, the pressure at the tip of the plunger 14 is medium pressure, and the plunger 14
The pressure at the rear end becomes high due to the force of the spring 11, and this pressure difference pushes the plunger 14 upward toward the inlet chamber 6a, bringing the ball valve 13 into close contact with the valve seat 1od and closing the valve portion. (Situation shown in FIG. 1) As a result, the flow of refrigerant into the evaporator is also stopped. Note that as time passes, the gas pressures in the inlet chamber 6a and the outlet chamber 6b become equal, but the spring 14a
Since the force is acting in the direction of pushing up the plunger 14, the pressure actually applied to the front and rear ends of the plunger 14 is greater than the force applied to the rear end of the plunger 14 by the force of the spring 14a, which pushes down the plunger and closes the valve. There's no way it will open up. Next, when the thermostat or the like restarts the operation, the above-mentioned operation at the start of operation is repeated.

As is clear from the above description, the refrigeration system according to the present invention includes a port-to-tally compressor, a condenser, a first capillary tube, a second capillary tube, a suction line interposed in the second capillary tube, and a fluid control valve, The control valve is
It integrally includes an outlet chamber and an inlet chamber having a valve, the inlet chamber being interposed and connected between the first capillary tube and the second capillary tube, and the outlet chamber being connected to the check pulp downstream of the check pulp Connects to the suction line,
The valve operates based on the pressure difference between the inlet chamber and the outlet chamber, opens when the inlet chamber has a higher pressure than the outlet chamber, and closes when the inlet chamber has a lower pressure than the outlet chamber. When the compressor is stopped, the superheated gas in the sealed container is prevented from flowing into the evaporator through the suction line, and the check pulp prevents the superheated gas from flowing into the evaporator.
On the other hand, what flows in through the second capillary tube can be blocked by a fluid control valve.

That is, the pressure in the inlet chamber becomes high pressure when the valve device is closed and medium pressure when it is open, so the change is significant. In addition, the outlet chamber is equipped with a check pulp between the suction line and the evaporator outlet of a rotary compressor that does not have check valves, and is connected to the suction line downstream of this check pulp. Since the pressure is low during operation and high pressure when stopped, the pressure change with the inlet chamber is extremely large, with the inlet chamber becoming high pressure during operation and the outlet chamber becoming high pressure when stopped, which causes the valve device to operate. Because of this, its operation is very accurate, and it is possible to completely prevent superheated gas from flowing into the evaporator.

Also, during operation, the plunger is always pushed down due to the pressure difference between the medium pressure in the inlet chamber via the first capillary tube and the low pressure in the outlet chamber, completely opening the ball valve and reducing the refrigerant flow rate. The cooling capacity can be reliably compensated without decreasing. Furthermore, since the valve device is closed by the pressure between the check pulp provided in the suction line and the rotary compressor, the mounting direction of the valve device does not have much effect.

Therefore, the structure is simpler than that of conventional solenoid valves.

Furthermore, since no electric power is required for operation, numerous effects such as no need for extra electric power or electrical wiring can be obtained by adding a fluid control valve with a very simple structure.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention when the refrigeration system is stopped, and FIG. 2 is a circuit diagram when the refrigeration system is in operation. 1 ... o = evening l) - compressor, 4
...Capacitor, 5a...First capillary tube, 6b...Second capillary tube, 6...Fluid control valve, 6a...・・・
Inlet chamber, 6b...Outlet chamber, 7...Efforator, 8...Check valve, 9...
...Suction line, 13... Valve, 14a.
...Ring seal → Le material, 14b... Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] Rotary compressor, Contin 1. A first capillary tube, a second capillary tube, a suction line with a check valve interposed therein, and a fluid control valve, the fluid control valve integrally having an outlet chamber and an inlet chamber having a valve. , the inlet chamber is interposedly connected between the first capillary tube and the second capillary tube, the outlet chamber is in communication with the suction line downstream of the check pulp, and the valve is connected to the inlet chamber and the second capillary tube. A refrigeration system that operates based on the pressure difference between the outlet chambers, opens when the pressure in the inlet chamber becomes higher than the outlet chamber, and closes when the pressure in the inlet chamber becomes lower than the outlet chamber.