Rotary Four-way Reversing Valve with Low Pressure Drop and Low Leakage

摘要

The invention provides a rotary four-way reversing valve with low pressure drop and low leakage, comprising a valve body and a valve core arranged in the valve body through bearings. The valve body comprises a low-pressure exhaust tube, a high-pressure air inlet tube, a condenser tube and an evaporating tube. The valve core is slantingly divided by a U-shaped seal ring with a spring into a high-pressure chamber and a low-pressure chamber that are not communicated with each other. The valve core comprises a through hole arranged in the high-pressure chamber and aligned with the high-pressure air inlet tube of the valve body and an opening aligned with the condenser tube or the evaporating tube, an opening arranged in the low-pressure chamber and always aligned with the low-pressure exhaust tube and an opening aligned with the condenser tube or the evaporating tube. By rotating the valve core by about 180°, a high-pressure air inflow from the high-pressure chamber is switched from being aligned with the condenser tube to being aligned with the evaporating tube, and a low-pressure exhaust from the low-pressure chamber is switched from being aligned with the evaporating tube to being aligned with the condenser tube. With the four-way reversing valve of the invention, the loss in circulating pressure is low, there is almost no leakage in the valve, and reliable reversing is achieved.

主权项

1. A rotary four-way reversing valve with low pressure drop and low leakage, comprising a valve body (1) and a valve core assembly (2) capable of switching between a first stop position and a second stop position in the valve body (1) by rotation, a high-pressure air inlet tube (D), an evaporating tube (E), a condenser tube (C) and a low-pressure exhaust tube (S) communicated with the valve body (1) being arranged on the valve body (1), characterized in that the valve core assembly (2) is coaxially assembled in the valve body (1) through bearings; a gap is formed between the outer circumference of the valve core assembly (2) and the inner wall of the valve body (1); a circle of seal structure (3) is arranged on the outer circumference of the valve core assembly (2), and the outermost edge of the seal structure (3) is in tight fit with the inner wall of the valve body (1); the space formed by the valve body (1) and the valve core assembly (2) is (at least) divided by the seal structure (3) into a high pressure chamber (4) and a low pressure chamber (5) that are mutually independent;
when the valve core assembly (2) is rotated to the first stop position, the high-pressure air inlet tube (D) is communicated with the condenser tube (C) only through the high-pressure chamber (4), and the evaporating tube (E) is communicated with the low-pressure exhaust tube (S) only through the low-pressure chamber (5); and when the valve core assembly (2) is rotated to the second stop position, the high-pressure air inlet tube (D) is communicated with the evaporating tube (E) only through the high-pressure chamber (4), and the condenser tube (C) is communicated with the low-pressure exhaust tube (S) only through the low-pressure chamber (5).