Pump body assembly, heat exchange apparatus, fluid machine and operating method thereof

Patent metadata

Field	Value
Publication number	US-11971031-B2
Application number	US-202017639888-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Nov 22, 2019
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

The present disclosure provides a pump body assembly, a heat exchange apparatus, a fluid machine and an operating method thereof. The pump body assembly includes a piston, a shaft, a piston sheath, and a cylinder. The shaft drives the piston to rotate and reciprocate within the piston sheath while rotating. The piston sheath is located in the cylinder, and a compression chamber is defined between an outer circumferential wall of the piston and an inner wall of the cylinder. A pressure relief recess is defined in the outer circumferential wall of the piston or the inner wall of the cylinder at a position corresponding to the compression chamber.

First claim

What is claimed is:

1. A pump body assembly, comprising:
a piston;
a shaft;
a piston sheath, the shaft driving the piston to rotate and reciprocate in the piston sheath while rotating; and
a cylinder comprising an exhaust channel, the piston sheath being located in the cylinder, wherein a compression chamber is defined between an outer circumferential wall of the piston and an inner wall of the cylinder, and a pressure relief recess is defined in the outer circumferential wall of the piston, such that, on a condition that the pump body assembly is in an exhaust process, gas which is in the compression chamber and away from the exhaust channel is capable of being discharged from the exhaust channel through the pressure relief recess;
wherein other portions of the outer circumferential wall of the piston, except the position where the pressure relief recess is located, are capable of mating with the inner wall of the cylinder during movement.

2. The pump body assembly according to claim 1 , wherein the pressure relief recess extends along a circumferential direction of the piston.

3. The pump body assembly according to claim 2 , wherein a sum of arc lengths respectively between two ends of the pressure relief recess along a rotation direction of the piston and corresponding two ends of the compression chamber is greater than or equal to 2 mm.

4. The pump body assembly according to claim 2 , wherein the cylinder further comprises an exhaust channel, and in two ends of the pressure relief recess along a rotation direction of the piston, an arc length between an end adjacent to the exhaust channel and the exhaust channel is greater than or equal to 1 mm.

5. The pump body assembly according to claim 1 , wherein
in an axial direction of the shaft, a distance between the pressure relief recess and an edge of the piston is greater than or equal to 1 mm; or
in an axial direction of the shaft, a distance between the pressure relief recess and an edge of the cylinder is greater than or equal to 1 mm.

6. The pump body assembly according to claim 1 , wherein the pressure relief recess comprises at least one pressure relief groove; on a condition that the pressure relief grooves are multiple, the multiple pressure relief grooves are communicated with or separated from each other.

7. The pump body assembly according to claim 6 , wherein a groove width of each pressure relief groove is greater than or equal to 0.5 mm.

8. The pump body assembly according to claim 6 , wherein a groove depth of each pressure relief groove is greater than or equal to 0.1 mm.

9. The pump body assembly according to claim 6 , wherein a cross-sectional area of all pressure relief grooves is greater than or equal to 0.025 mm 2 .

10. The pump body assembly according to claim 6 , wherein a ratio of a sum of a cross-sectional area of all pressure relief grooves to a cross-sectional area of the piston along a direction perpendicular to an axis of the cylinder is greater than or equal to 0.001 and smaller than or equal to 0.5.

11. The pump body assembly according to claim 6 , wherein the cross-section of each pressure relief groove is rectangular or fan-shaped.

12. The pump body assembly according to claim 6 , wherein the number of the pressure relief groove is one, and the pressure relief groove extends along a circumferential direction of the piston; or
the number of the pressure relief grooves is two, and the two pressure relief grooves are crossed; or
the number of the pressure relief grooves is three, and the three pressure relief grooves are in a shape of H; or
the number of the pressure relief grooves is three, and the three pressure relief grooves are in a shape of I; or
the number of the pressure relief grooves is plural, and the pressure relief grooves are in a fishbone shape; or
the number of the pressure relief grooves is two, wherein a first pressure relief groove extends along a circumferential direction of the piston, and a second pressure relief groove has a ring shape and is crossed with the first pressure relief groove.

13. The pump body assembly according to claim 1 , wherein a ratio of a volume of the pressure relief recess to a cylinder displacement of the pump body assembly is greater than or equal to 0.001 and smaller than or equal to 0.02.

14. A fluid machine comprising the pump body assembly according to claim 1 .

15. The fluid machine according to claim 14 , wherein the fluid machine is a compressor.

16. A heat exchange apparatus, comprising the fluid machine according to claim 14 .

17. An operating method of the fluid machine according to claim 14 , wherein the cylinder of the fluid machine defines a suction channel, a pressure relief channel, and an exhaust channel spaced from each other; the pressure relief channel is communicated with the chamber of the cylinder through a pressure relief port, and the exhaust channel is communicated with the chamber of the cylinder through an exhaust port; the operating method comprises:
at the end of exhaust of the fluid machine, the pressure relief recess of the pump body assembly of the fluid machine is directly or indirectly communicated with the pressure relief port while isolated from the exhaust port.

18. A pump body assembly, comprising:
a piston;
a shaft;
a piston sheath, the shaft driving the piston to rotate and reciprocate in the piston sheath while rotating; and
a cylinder comprising an exhaust channel, the piston sheath being located in the cylinder, wherein a compression chamber is defined between an outer circumferential wall of the piston and an inner wall of the cylinder, and a pressure relief recess is defined in the outer circumferential wall of the piston such that, on a condition that the pump body is in an exhaust process, gas which is in the compression chamber and away from the exhaust channel is capable of being discharged from the exhaust channel through the pressure relief recess;
wherein the pressure relief recess extends along a circumferential direction of the piston.

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Dong Mingzhu
• Hu Yusheng
• Wei Huijun
• Xu Jia
• Du Zhongcheng
• Ren Liping
• Yang Sen
• Li Zhi
• Zhang Peilin
• Liang Shebing
• Shi Zhengliang
• Zhang Rongting
• Ding Ning

Classifications

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C18/22 Primary

  of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member · CPC title

• F04C29/00

  Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00 · CPC title