JPS608575A - Selector valve of four way type - Google Patents

Abstract

PURPOSE:To simplify construction of a valve so as to improve its reliability and reduce its cost, by reciprocally moving a slide valve through a piston, being actuated by two kinds of solenoid valves in high and low pressure sides and having different diameters, so as to select a flow of fluid in normal and reverse directions. CONSTITUTION:At room cooling operation, high pressure gas delivered from a compressor is allowed to flow into a valve structure 1' from an inflow pipe 4' and through a flow pipe 6', being allowed to flow in two kinds of heat exchangers and then becoming low pressure gas, thus the low pressure gas is allowed to flow again into the valve structure 1' from a flow pipe 7' and through a slide valve 2, being sucked to the compressor from an outflow pipe 5'. Here the gas is communicated through solenoid valves 14, 15 respectively in high and low pressure sides to the large bore side of a piston 3 with different diameters interlocking to the slide valve 2. Then for instance, at room heating operation, a pressure is applied to the large bore side of the piston 3 with different diameters so as to move the slide valve 2 leftward against piston force in the small bore side and selece a flow path by closing the low pressure side solenoid valve 14 further opening the high pressure side solenoid valve 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a reversible refrigeration system for air conditioners and refrigerators [Background of the Invention] A conventional four-way switching valve will be described with reference to FIG.

During cooling operation, the high pressure gas discharged from the compressor flows through the inflow pipe 4.
It enters the valve body 1, passes through the conduit pipe 6 as shown by the solid line arrow, communicates with the first heat exchanger (acts as a condenser), and then communicates with the second heat exchanger (acts as an evaporator). After passing through, the gas becomes a low-pressure gas and enters the four-way valve body again through the conduit pipe 7, passes through the passage of the slide valve 2 as shown by the arrow, and is sucked into the compressor through the outflow pipe 5.

During heating operation, the electromagnetic coil 8 is energized and the plunger 1
1 is sucked in, the ball valve 12 in the pilot valve 16 opens, and the high pressure gas communicated through the thin tube 13 pressurizes one end of the piston 3 with a different diameter, as shown by the broken line. Since the different diameter piston has a smaller diameter on the valve body side, it moves to the left due to the pressure difference, interlocking the slide valve. The flow of refrigerant gas in the conduction pipes 6 and 7 provided in the valve body is reversed as shown by the broken line, and the cycle is switched to the heating cycle.

As described above, in the past, a pilot valve 16 and an electromagnetic coil 8 for operating the pilot valve 16 were provided to switch the flow of fluid in the valve body, and a dual valve mechanism was required.

[Object of the Invention] The present invention was invented in view of the above, and an object of the present invention is to provide a four-way switching valve that reliably switches a flow path from cooling operation to heating operation, or from heating operation to cooling operation.

[Overview of the invention]

In order to achieve the above object, the present invention is characterized by eliminating the need for a pilot valve and using a small two-hole solenoid valve for reliable switching drive.

[Embodiments of the invention]

FIG. 2 shows the structure of a four-way switching valve showing one embodiment of the present invention. The structure of the valve body is the same as the conventional one, and the operation is also the same. This figure shows the valve position during cooling operation, and some counterfeit money has the solenoid valve 14 that communicates with the low pressure side open. Here, the large diameter end of the different diameter piston is under low pressure υ, and high pressure is applied to the small diameter side piston in the valve body, so the slide valve 2 is in the right position. During heating operation, by closing the low-pressure side solenoid valve 14 and opening the high-pressure side solenoid valve 15, the lower side is applied to the large diameter side of the different diameter piston, overcomes the force of the small diameter side piston, and the slide valve moves to the left. .

Therefore, the fluid passage is cut out as shown by the broken line.

〔Effect of the invention〕

As explained above, the present invention eliminates the need for a pilot valve, which is a problem with conventional four-way switching valves, so that the structure can be simplified, reliability can be improved, and production costs can be reduced. In addition, the solenoid valve coil uses a small manufactured solenoid valve that opens and closes the narrow tube passage, so it has the great effect of requiring less power and having fewer failures.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a conventional four-way switching valve, and FIG. 2 is a main body sectional view showing the structure of a four-way switching valve according to an embodiment of the present invention.

Claims (1)

[Claims] A four-way switching valve that has 24 passages of inlet, outlet, and separate passages, and can switch the flow of fluid in the two passages in forward and reverse directions using the pressure difference of the fluid, and works in conjunction with pistons of different diameters. The high-pressure and low-pressure sides are connected to the large-diameter end of the piston of different diameters via solenoid valves, and by alternately operating one of the solenoid valves, the slide valve can be moved back and forth. The four-way switching valve is characterized in that the flow direction of the fluid at the 1 m port is switched.