Compact motor driven four-way reversal valve

Abstract

The invention provides a motor driven four-way reversal valve which has the advantages of compact structure and lower manufacturing cost. The four-way reversal valve comprises a synchro motor and a cam member driven by the synchro motor, wherein the rotating angular velocity of the cam member is same to that of a reversing rotor, and a location switch with a normally open contact, a normally close contact and a public contact is arranged nearby the cam member; the cam member is provided with a cam used for leading the location switch to act and allowing the work position of the location switch to change once when the cam member rounds one-quarter circumference; when the reversing rotor is located in a heating position, the contact which is just switched to be disconnected with the public contact on the location switch is a heating contact, and the other contact is a refrigerating contact; and the heating contact is conducted with a heating supple line, the refrigerating contact is conducted with a refrigerating supple line, the public contact is conducted with one electrode of the synchro motor, and the other one electrode of the synchro motor is conducted with a concentric line. The four-way reversal valve provided by the invention has the advantages of short conduction time, high motion reliability, simple structure, simplified fitting process, lower cost and the like.

Description

technical field [0001] The invention relates to a four-way reversing valve for heating and cooling air conditioners. Background technique [0002] Such as figure 1 , figure 2 As shown, the heating and cooling air conditioner uses a traditional electromagnetic four-way reversing valve to change the flow direction of the refrigerant during the mutual conversion of cooling and heating. The shortcomings of the traditional electromagnetic four-way reversing valve are: [0003] 1) After the conversion from cooling to heating is completed, the electromagnetic coil is still energized, which does not save energy, and at the same time, it is easy to burn out due to the long power-on time; [0004] 2) The electromagnetic pilot valve is used to control the pressure difference on both sides of the spool valve to achieve reversing. There are many intermediate links, and the spool valve is easy to get stuck without reversing; [0005] 3) In addition to the electromagnetic coil, the nu...

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Problems solved by technology

[0005] 3) In addition to the electromagnetic coil, the number of other parts reaches more than 35, with many parts and complex structure;

[0006] 4) The assembly process is complicated, especially there are more than 16 welding parts, the requirements for welding equipment are high, and the quality is difficult to control;

[0007] 5) High material and processing costs

However, this patent document only discloses the structure of a four-way valve driven by a servo motor, but does not disclose the structure of a four-way valve driven by a motor with other characteristics

According to the structure of the four-way valve defined in the technical solution, those skilled in the art can also directly judge that the technical solution can only be driven by a servo motor. If a motor with other characteristics is used such as a synchronous motor to drive, There will be problems that the action timing, time and rotation angle of the reversing rotor cannot be controlled, so that it is impossible to ensure that the reversing rotor of the four-way valve is in the correct working position

In addition, those skilled in the art also know that the driving and control of the servo motor requires a relatively complicated control circuit, which makes such a four-way valve not actually cost-effective

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