Flow path switching valve

• US 9,644,750 B2
• Filed: 03/03/2014
• Issued: 05/09/2017
• Est. Priority Date: 07/18/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seungjun
• Primary Examiner(s): KEASEL, ERIC S
• Application Number:
  US14/386,145
• Publication Number:
  US 20160238140A1
• Time in Patent Office: 1,163 Days
• Field of Search: 13762546, 251158-163
• CPC Class Codes: F16K 1/228 Movable sealing bodies
• CPC Class Codes: F16K 11/0525 the closure members being pivoted around an essentially central axis
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/02731 using one three-way valve
• CPC Class Codes: F25B 2313/02741 using one four-way valve
• CPC Class Codes: F25B 2500/221 Preventing leaks from developing
• CPC Class Codes: F25B 41/26 of fluid flow reversing valves

Abstract

Disclosed is a flow path switching valve. The flow path switching valve includes a housing provided with a plurality of ports in a peripheral direction thereof, the housing having a space in which fluid is received, a valve body including a disc configured to divide the space of the housing into a plurality of flow spaces and to switch a flow direction of fluid via rotation, and a sealing member configured to seal at least one of an upper end and a lower end of the flow spaces, and a pressure plate configured to pressurize the sealing member toward the valve body as the valve body is rotated.

Claims

1. A flow path switching valve comprising:

a housing having a cavity in which fluid is received, the housing having an opening on at least one of an upper end or a lower end and a plurality of ports on a lateral side;

a valve body rotatably provided in the cavity, the valve body including a divider that divides the cavity into a plurality of flow spaces and configured to switch a flow path through prescribed ones of the plurality of ports based on rotation of the divider; and

a sealing module provided over the opening to seal the opening of the housing,

wherein the sealing module is configured to move relative to the opening based on the rotation of the valve body such that the sealing module is separated from the valve body when the valve body is rotated and comes into contact with the valve body when rotation of the valve body stops.

2. The flow path switching valve according to claim 1, wherein the sealing module seals a gap between a peripheral portion of the valve body that corresponds to an inner circumferential surface of the cavity and the inner circumferential surface of the cavity.

3. The flow path switching valve according to claim 1, wherein the sealing module includes

a sealing member configured to seal the opening, and

a pressure plate provided over the sealing member,

wherein the pressure plate is configured to rotate with the valve body and to push the sealing member toward the valve body based on the rotation.

4. The flow path switching valve according to claim 3, wherein the pressure plate and the valve body are configured to rotate about a rotational axis of the valve body, and

wherein the sealing member is configured to move vertically along the rotational axis of the valve body as the valve body rotates.

5. The flow path switching valve according to claim 3, wherein the pressure plate pushes the sealing member toward the valve body as the valve body rotates to switch the flow path such that the sealing member is in contact with the valve body when the valve body completes the rotation to switch the flow path.

6. The flow path switching valve according to claim 3, wherein the sealing member has a plurality of first ridges that protrude toward the pressure plate and the pressure plate has a plurality of pressure portions in a mechanical linkage with the plurality of first ridges, the plurality of pressure portions configured to press against the first ridges during rotation of the pressure plate to push the sealing member against the valve body.

7. The flow path switching valve according to claim 6, wherein the valve body has a plurality of second ridges and the sealing member has a plurality of indentations in a mechanical linkage with the plurality of second ridges, wherein the plurality of second ridges and the plurality of indentations are configured to separate the sealing member from the valve body during rotation of the valve body and the second ridges are positioned in the plurality of indentations when the sealing member is in contact with the valve body.

8. The flow path switching valve according to claim 7, wherein the sealing member includes

an inner rim portion through which a rotation shaft passes, the inner rim portion having the plurality of indentations,

an outer rim portion having the plurality of first ridges, and

a plurality of connection rods that connect the inner rim portion and the outer rim portion to each other.

9. The flow path switching valve according to claim 8, wherein the housing is provided with four or three ports arranged at a prescribed interval,

wherein the plurality of indentations are arranged at an interval of 90 degrees or more about the rotation shaft,

wherein the plurality of first ridges are arranged at an interval of 90 degrees or more about the rotation shaft, and

wherein the plurality of ports are arranged at an interval of 90 degrees or more about the rotation shaft.

10. The flow path switching valve according to claim 7, wherein the sealing member includes

an inner rim portion through which a rotation shaft passes, the inner rim portion having the plurality of first ridges,

an outer rim portion having the plurality of indentations, and

a plurality of connection rods that connect the inner rim portion and the outer rim portion to each other.

11. The flow path switching valve according to claim 10, wherein the housing is provided with four or three ports arranged at a prescribed interval,

wherein the plurality of indentations are arranged at an interval of 90 degrees or more about the rotation shaft,

wherein the plurality of first ridges are arranged at an interval of 90 degrees or more about the rotation shaft, and

wherein the plurality of ports are arranged at an interval of 90 degrees or more about the rotation shaft.

12. The flow path switching valve according to claim 7, wherein the second ridges cause the sealing member to be separated from the peripheral portion of the valve body corresponding to the inner circumferential surface of the housing during rotation of the valve body to switch the flow path, and

wherein the second ridges are positioned in the indentations such that the sealing member comes into contact with the peripheral portion of the valve body corresponding to the inner circumferential surface of the housing when the valve body completes the rotation to switch the flow path.

13. The flow path switching valve according to claim 7, wherein the second ridges of the valve body are positioned in the indentations when the pressure portions of the pressure plate presses against the first ridges of the sealing member.

14. The flow path switching valve according to claim 13, wherein the first ridges, the second ridges, and the indentations respectively have a prescribed inclination or curvature.

15. The flow path switching valve according to claim 6, wherein the pressure plate includes

a base portion having a through-hole for insertion of a rotation shaft, the plurality of pressure portions radially extending from the base portion, and

a reinforcement rib provided between two neighboring pressure portions.

16. The flow path switching valve according to claim 15, wherein the reinforcement rib has a protrusion that protrudes toward the valve body,

wherein the valve body has an insertion slot to accommodate the protrusion, and

wherein a torque of the pressure plate is transmitted to the valve body by the protrusion inserted into the insertion slot when the pressure plate is rotated via rotation of the rotation shaft.

17. The flow path switching valve according to claim 3, further including a guide pin mounted to the sealing member to prevent the sealing member from being rotated with the valve body when the valve body is rotated.

18. The flow path switching valve according to claim 17, wherein the pressure plate contacts the guide pin to limit rotation of the pressure plate corresponding to a prescribed position of the valve body for a prescribed flow path.

19. The flow path switching valve according to claim 1, wherein an elastic member is provided at a distal end of the divider and a sealing protrusion is provided on the inner circumferential surface of the housing to correspond to the elastic member, wherein the sealing protrusion is configured to contact the elastic member to provide a seal between the valve body and the inner circumferential surface of the housing when the valve body is rotated to a prescribed position.

20. An air conditioner comprising:

a cooling/heating cycle including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger; and

a flow path switching valve coupled to the cooling/heating cycle to change a direction of flow of refrigerant in the cooling/heating cycle,

wherein the flow path switching valve includes

a housing having a cavity in which fluid is received, the housing having an opening on an upper end and a plurality of ports on a lateral side,

a valve body rotatably provided in the cavity and configured to change the direction of flow of the refrigerant through respective ports based on a positon of the valve body, and

a sealing module provided over the opening to be in mechanical linkage with the valve body to seal the opening based on rotation of the valve body, wherein

when the valve body is in a first position, the sealing module is configured to contact the valve body to seal the opening, and

while the valve body is rotated from the first position to a second position, the valve body is configured to raise the sealing module away from the valve body such that the sealing module does not contact the valve body during the rotation.