Valve core for four-way switching valve and four-way switching valve thereof

Abstract

The present invention provides a valve core for a four-way switching valve, which can ensure smooth fluid movement in the valve core and can improve mechanical strength. The four-way switching valve (2) comprises the following components: a valve body (3) with a closed space; a first pipe (5) connected with one side of the valve body (3); a second pipe (7) connected with the other side of the valve body (3); a third pipe (11) and a fourth pipe (12) which are separated by the second pipe (7) and configured adjacently with two sides; a valve seat (16) which is provided in the valve body (3) andis provided with an opening communicated with each pipe; and a valve core (1) which is slidably configured to the valve seat (16). Through the sliding of the valve core (1), the communication state between the first pipe (5) and the third pipe (11) or between the first pipe (5) and the fourth pipe (12) is selectively switched. The valve core (1) comprises the following components: a supporting rod (1d) which is configured to penetrate an opening end face part (1j) adjacently with the opening end face part (1j) of a bowl-shaped body (1c); and a flange part (projected part) (1k) which is formedintegrally with the a main body (1c) at the position of the of the opening end face part (1j) that is next to the main body (1c). The flange part (1k) projects to a position that is next to the innerwall surface (3c) of the valve body (3) from the outer surface of the main body (1c) along the axial direction of the supporting rod (1d).

Description

technical field [0001] The present invention relates to a spool for a four-way switching valve and a four-way switching valve used in equipment using reversible refrigeration cycles such as refrigeration equipment and air conditioners. Background technique [0002] Conventionally, a four-way switching valve is arranged in the refrigerant passage of the refrigeration cycle to switch the refrigerant passage and switch between indoor cooling and heating. As such a four-way switching valve, various proposals are made in Patent Documents 1 to 3 and the like. [0003] As one of the above four-way switching valves, for example, Figure 12 The described four-way switching valve 61 is provided with a connection port 65 communicating with the discharge pipe 80 of the compressor 63 and a connection port communicating with the suction pipe 66 of the compressor 63 on the airtight and hollow cylinder-shaped valve body 62. Port 67, two connection ports 72, 73 communicating with conduits 7...

AI Technical Summary

Problems solved by technology

[0010] In the above-mentioned conventional structure, when high-pressure refrigerant (such as R410A, etc.) is used, the pressure difference between the inside and outside of the valve element 74 becomes large, so the valve element 74 is deformed, and the switching operation cannot be performed smoothly or fluid leakage and other problems occur.

Moreover, it is also possible that the spool 74 expands due to reverse pressure, causing the reinforcing strut 75 to fall off.

[0011] And, if Figure 14 As shown, the gap d between the peripheral portion of the connection port 65 of the conduit 64 and the outer peripheral surface 74d of the valve element 74 is narrow, so the pressure loss when the high-pressure refrigerant flows in the direction of the arrow in the figure becomes large, causing the refrigerant to Reduced flow, causing reduced efficiency in refrigeration units, etc.

[0012] In addition, if Figure 15 As shown, in the conventional four-way switching valve 61, since the interior of the spool 74 is narrow, the pressure loss when the low-pressure refrigerant flows in the direction of the arrow in the figure becomes large, resulting in a decrease in the flow rate of the refrigerant, which affects the efficiency of the refrigeration unit, etc. reduce

Images