A four-way reversing valve, its pilot valve, and a processing method for the pilot valve

Abstract

The invention discloses a pilot valve for a four-way reversing valve. The pilot valve comprises a valve body (21) and a bushing (24) which are coaxially arranged, wherein the end part of the valve body (21) is provided with a cylindrical peripheral wall (211); one end of the bushing (24) is sleeved in the cylindrical peripheral wall (211); the cylindrical peripheral wall (211) is provided with at least one through hole (212) and / or at least one groove (213); and the through hole (212) and / or the groove (213) penetrate(s) the cylindrical peripheral wall (211). By using the pilot valve of the structure, a soldering flux and a soldering material during soldering can be prevented from losing due to the influence of dead weight, so that the soldering flux and the soldering material can fully fill a soldering seam to improve the forming effect and the stability of the soldering seam. The invention also discloses the four-way reversing valve comprising the pilot valve and a machining method of the pilot valve, which have the corresponding technical effects.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a four-way reversing valve and a pilot valve used in the above-mentioned equipment. In addition, the present invention also relates to a processing method of the above-mentioned pilot valve. Background technique [0002] The four-way reversing valve is an important part of refrigeration or heating equipment, which is installed in the refrigerant circuit composed of compressor, condenser, indoor heat exchanger and outdoor heat exchanger. The working principle of the four-way valve is to change the outflow direction of the internal refrigerant by switching the flow channel to achieve the above-mentioned cooling or heating effect. [0003] Please refer to figure 1 with figure 2 , figure 1 It is a structural schematic diagram of a four-way reversing valve in the prior art; figure 2 for figure 1 Schematic diagram of the pilot valve in . [0004] In the exis...

AI Technical Summary

Problems solved by technology

[0006] However, even if it is set in this way, the welding seam between the small valve body 21' and the casing 24' is still prone to the following adverse phenomena: ① The welding ring 25' is easy to spring out during the heating process of the welding seam between the small valve body 21' and the casing 24', and the solder melts Afterwards, it deviates from the weld seam, resulting in a lack of weld material; ②The flux added to the weld seam is easy to lose under the action of gravity during the heating process, resulting in poor weld formation due to the lack of flux on the upper part of the weld seam; ③The melted liquid solder must overcome the action of gravity Increased difficulty in capillary penetration of weld seams

Therefore, it is difficult to guarantee the first pass rate of the welding seam between the small valve body 21' and the casing 24' during the welding process, which brings market risks such as product weld leakage and high rework costs.

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