Metal powder injection molding integrated electromagnetic four-way reversing valve for refrigerating system

Abstract

The invention relates to the technical field of refrigerating system control parts, in particular to a metal powder injection molding integrated electromagnetic four-way reversing valve for a refrigerating system, which comprises a stainless steel valve body, a stainless steel valve seat, three stainless steel air outlet pipes and a stainless steel air inlet pipe, the stainless steel valve seat is integrally formed in the middle of the inner side wall of the stainless steel valve body in an injection molding mode. According to the metal powder injection molding integrally-formed electromagnetic four-way reversing valve for the refrigerating system, a valve body, a valve seat, three air outlet pipes and an air inlet pipe are integrally formed through the MIM technology, manufacturing of six key components is completed at a time, and traditional procedures such as multi-pass welding, acid pickling and cleaning are omitted; auxiliary materials such as silver welding wires, welding rings and scaling powder are not needed, the material utilization rate is increased, the comprehensive manufacturing cost is reduced, multiple welding lines are eliminated through the integrally-formed structure, the coefficient of thermal expansion of all stainless steel materials is consistent, the welding line fatigue cracking risk is avoided after long-term use, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of refrigeration system control components, specifically to an electromagnetic four-way reversing valve for refrigeration systems, which is integrally molded from metal powder. Background Technology

[0002] The electromagnetic four-way directional valve is a core component of a refrigeration system, enabling switching between cooling and heating modes. The manufacturing process of its valve body directly determines its performance and market competitiveness. Existing electromagnetic four-way directional valves for refrigeration systems have significant technical limitations:

[0003] Firstly, the manufacturing process of the valve body assembly is complex, resulting in high costs. Traditional electromagnetic four-way directional valves employ multi-material splicing and multi-stage welding processes for their valve body assemblies, primarily in two ways: one is by flame silver brazing of four copper tubes, a brass valve seat, and a brass main valve body; the other is by flame silver brazing or tunnel furnace silver brazing of four copper tubes, a stainless steel valve seat, and a stainless steel main valve body. This process requires the use of flammable gases such as oxygen, liquefied petroleum gas, and nitrogen, as well as protective gases, consuming large amounts of auxiliary materials such as silver solder wire, solder rings, and flux. Furthermore, each welding stage requires tedious manual processes such as pickling, cleaning, air blowing, and drying, leading to a significant increase in material and labor costs.

[0004] Secondly, multi-pass welding poses potential performance risks and safety hazards. Different materials (copper, brass, stainless steel) have significantly different coefficients of thermal expansion. During long-term use, the weld seams are prone to fatigue cracking due to temperature cycling, leading to refrigerant leakage. The use of flammable gases during the welding process increases production safety risks, and the weld seams are prone to defects such as porosity and inclusions, affecting the valve body's sealing performance and service life.

[0005] Third, material waste and environmental pressure are prominent. Traditional splicing structures require reserved welding allowance, resulting in low material utilization. Wastewater and exhaust gas generated by pickling and cleaning processes require additional investment in environmental protection equipment for treatment, which does not conform to the concept of green production. Therefore, it is proposed to use a metal powder injection molded one-piece electromagnetic four-way reversing valve for the refrigeration system. Summary of the Invention

[0006] In view of this, the present invention provides an integrally molded electromagnetic four-way reversing valve for refrigeration systems using metal powder injection molding, in order to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0007] The technical solution of the present invention is implemented as follows: a metal powder injection molded electromagnetic four-way reversing valve for refrigeration system includes a stainless steel valve body, a stainless steel valve seat, three stainless steel outlet pipes and one stainless steel inlet pipe; the stainless steel valve seat is integrally injection molded in the middle of the inner wall of the stainless steel valve body; the three stainless steel outlet pipes are evenly distributed along the top circumference of the stainless steel valve body and integrally injection molded with the stainless steel valve body; the stainless steel inlet pipe is integrally injection molded in the outer bottom wall of the stainless steel valve body.

[0008] More preferably, the stainless steel valve body, stainless steel valve seat, stainless steel outlet pipe, and stainless steel inlet pipe are made of stainless steel metal powder and integrally formed by MIM process.

[0009] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions:

[0010] This invention uses MIM technology to achieve integrated molding of the valve body, valve seat, three outlet pipes, and one inlet pipe, completing the manufacturing of six key components in one go, eliminating the need for traditional multi-stage welding, pickling, and cleaning processes; it eliminates the need for auxiliary materials such as silver solder wire, solder rings, and flux, improving material utilization and reducing overall manufacturing costs. The integrated molding structure eliminates multiple weld seams, and the all-stainless steel material has a consistent coefficient of thermal expansion, eliminating the risk of weld seam fatigue cracking during long-term use and extending service life.

[0011] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a structural diagram of the present invention;

[0014] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0015] Reference numerals: 1. Stainless steel valve body; 2. Stainless steel valve seat; 3. Stainless steel outlet pipe; 4. Stainless steel inlet pipe. Detailed Implementation

[0016] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, this embodiment of the invention provides an integrally molded electromagnetic four-way reversing valve for a refrigeration system using metal powder injection molding, comprising a stainless steel valve body 1, a stainless steel valve seat 2, three stainless steel outlet pipes 3 and one stainless steel inlet pipe 4; the stainless steel valve seat 2 is integrally injection molded in the middle of the inner side wall of the stainless steel valve body 1; the three stainless steel outlet pipes 3 are evenly distributed along the top circumference of the stainless steel valve body and integrally injection molded with the stainless steel valve body 1; the stainless steel inlet pipe 4 is integrally injection molded in the outer bottom wall of the stainless steel valve body 1.

[0019] In one embodiment, the stainless steel valve body 1, stainless steel valve seat 2, stainless steel outlet pipe 3, and stainless steel inlet pipe 4 are integrally formed using stainless steel metal powder through MIM process.

[0020] When the invention is in operation: during cooling, the electromagnetic coil is de-energized, and the refrigerant flows into the valve body cavity from the stainless steel inlet pipe 4, is guided by the valve core flow channel, and flows out from one of the stainless steel outlet pipes 3, entering the indoor heat exchanger to complete the cooling cycle. During heating, after the electromagnetic coil is energized, the refrigerant flows in from the stainless steel inlet pipe 4, is guided by the valve core, and flows out from the other stainless steel outlet pipe 3, switching to the outdoor heat exchanger to realize the heating cycle.

[0021] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A one-piece injection molded electromagnetic four-way reversing valve for refrigeration systems using metal powder, characterized in that: It includes a stainless steel valve body (1), a stainless steel valve seat (2), three stainless steel air outlet pipes (3) and a stainless steel air inlet pipe (4); the stainless steel valve seat (2) is integrally injection molded in the middle of the inner side wall of the stainless steel valve body (1); the three stainless steel air outlet pipes (3) are evenly distributed along the top circumference of the stainless steel valve body and integrally injection molded with the stainless steel valve body (1); the stainless steel air inlet pipe (4) is integrally injection molded on the outer bottom wall of the stainless steel valve body (1).

2. The electromagnetic four-way reversing valve for refrigeration systems, integrally molded from metal powder according to claim 1, is characterized in that: The stainless steel valve body (1), stainless steel valve seat (2), stainless steel outlet pipe (3), and stainless steel inlet pipe (4) are made of stainless steel metal powder and integrally formed by MIM process.

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