CN-224228833-U - Diaphragm compressor

CN224228833UCN 224228833 UCN224228833 UCN 224228833UCN-224228833-U

Abstract

The application discloses a diaphragm compressor which comprises an oil side membrane head and a piston assembly, wherein the oil side membrane head is provided with an oil side membrane cavity and a through hole which are arranged along the axial direction of the oil side membrane head and are communicated, the piston assembly comprises a piston rod, a first guide piece and a piston head, the piston rod is at least partially movably arranged in the through hole in a penetrating mode, the first guide piece is movably arranged in the through hole and is positioned at one side of the piston rod, which is close to the oil side membrane cavity, the piston head is arranged in the through hole and is positioned at one side of the first guide piece, which is close to the oil side membrane cavity, the piston head is in sealing connection with the oil side membrane head, the piston rod, the first guide piece and the piston head can move along the axial direction, and when the piston rod moves along the axial direction, the first guide piece is respectively abutted with the piston rod and the piston head. According to the piston head, the first guide piece and the piston rod are independent and not connected, the centering of the piston rod and the through hole does not directly influence the centering of the piston and the through hole, and the piston is prevented from being eccentrically worn and blocked.

Inventors

DIAO ANNA
ZENG YUEBO
Chen Kangbing
XU ZAN
REN SHENGDONG

Assignees

中国船舶集团有限公司第七一一研究所

Dates

Publication Date: 20260512
Application Date: 20250609

Claims (12)

1. A diaphragm compressor, comprising: an oil side membrane head having an oil side membrane chamber and a through hole provided along an axial direction of the oil side membrane head, the oil side membrane chamber communicating with the through hole; A piston assembly, comprising: the piston rod is at least partially movably arranged in the through hole in a penetrating way; The first guide piece is movably arranged in the through hole and is positioned at one side of the piston rod, which is close to the oil side membrane cavity; The piston head is movably arranged in the through hole and is positioned at one side of the first guide piece close to the oil side membrane cavity; The piston rod, the first guide piece and the piston head can all move along the axial direction, and when the piston rod moves along the axial direction towards the direction close to the oil side membrane cavity, the first guide piece is respectively abutted with the piston rod and the piston head.
2. The diaphragm compressor of claim 1, wherein the first guide is spherical and is capable of point contact with the piston head and the piston rod, respectively.
3. The diaphragm compressor of claim 2, wherein the piston rod comprises: the rod body is at least partially movably arranged in the through hole in a penetrating way; The second guide piece is connected to one side, close to the first guide piece, of the rod body, and the second guide piece can be abutted with the first guide piece.
4. The diaphragm compressor of claim 3, wherein, The second guide has a first side facing the first guide; the piston head has a second side facing the first guide; the first side and the second side are both planes perpendicular to the axial direction.
5. A diaphragm compressor according to claim 3, wherein the hardness of the piston head and the hardness of the second guide are both less than the hardness of the first guide.
6. The diaphragm compressor of claim 5, wherein the piston head and the second guide are both copper alloy pieces and the first guide is a steel alloy ball.
7. The diaphragm compressor of claim 3, wherein, A mounting hole is formed in one side, close to the first guide piece, of the rod body; The second guide includes: The body is connected with the rod body, and one side of the body, far away from the rod body, is used for being abutted with the first guide piece; The positioning protrusion is connected to one side, far away from the first guide piece, of the body, is inserted into the mounting hole and is connected with the rod body.
8. The diaphragm compressor of claim 2, wherein the diameter of the first guide is equal to the aperture of the through hole.
9. The diaphragm compressor of claim 8, wherein the piston head, the first guide, and the throughbore are concentric about a central axis.
10. The diaphragm compressor of claim 8, wherein an outer diameter of the piston rod is smaller than a bore diameter of the through hole.
11. The diaphragm compressor of claim 1, wherein the piston head is positioned within the throughbore when the piston rod is moved furthest in the axial direction.
12. The diaphragm compressor of claim 1, characterized in that the diaphragm compressor further comprises: The gas side membrane head is connected with the oil side membrane head and is arranged at one side of the oil side membrane cavity far away from the through hole; The membrane is arranged between the gas side membrane head and the oil side membrane head and respectively covers the gas side membrane cavity and the oil side membrane cavity with the gas side membrane head and the oil side membrane head; The driving structure is arranged on one side, far away from the air side membrane head, of the oil side membrane head, and the output end of the driving structure is connected with one end, far away from the first guide piece, of the piston rod and is used for driving the piston assembly to move along the axial direction.

Description

Diaphragm compressor Technical Field The application belongs to the technical field of diaphragm compressors, and particularly relates to a diaphragm compressor. Background The diaphragm compressor is suitable for high-pressure and ultra-high-pressure working environments because of good sealing performance. The sealing of the oil piston under high pressure conditions is critical in determining the operating life of the diaphragm compressor. The oil piston is driven by a crank connecting rod mechanism, the centering of the oil piston and a piston cylinder is ensured by the machining and assembly precision of a crankcase, a middle body, a cross head, an oil cylinder and other parts of the compressor, and the higher the working pressure is, the harder the oil piston is sealed, and the higher the centering requirement on the oil piston and the piston cylinder is. When the centering between the oil piston and the piston cylinder cannot meet the requirement, the oil piston is biased, and the compressor cannot work normally. Disclosure of utility model The embodiment of the utility model provides a diaphragm compressor, which aims to solve the problem that when the centering between the existing oil piston and the existing piston cylinder cannot meet the requirement, the oil piston is eccentric, and the compressor cannot work normally. The technical scheme is that the diaphragm compressor provided by the embodiment of the application comprises the following components: an oil side membrane head having an oil side membrane chamber and a through hole provided along an axial direction of the oil side membrane head, the oil side membrane chamber communicating with the through hole; A piston assembly, comprising: the piston rod is at least partially movably arranged in the through hole in a penetrating way; The first guide piece is movably arranged in the through hole and is positioned at one side of the piston rod, which is close to the oil side membrane cavity; The piston head is arranged in the through hole and is positioned at one side of the first guide piece close to the oil side membrane cavity; The piston rod, the first guide piece and the piston head can all move along the axial direction, and when the piston rod moves along the axial direction towards the direction close to the oil side membrane cavity, the first guide piece is respectively abutted with the piston rod and the piston head. In some embodiments, the first guide is spherical, the first guide being capable of point contact with the piston head and the piston rod, respectively. In some embodiments, the piston rod comprises: the rod body is at least partially movably arranged in the through hole in a penetrating way; The second guide piece is connected to one side, close to the first guide piece, of the rod body, and the second guide piece can be abutted with the first guide piece. In some embodiments of the present invention, in some embodiments, The second guide has a first side facing the first guide; the piston head has a second side facing the first guide; the first side and the second side are both planes perpendicular to the axial direction. In some embodiments, the hardness of the piston head and the hardness of the second guide are both less than the hardness of the first guide. In some embodiments, the piston head and the second guide are both copper alloy pieces and the first guide is a steel alloy ball. In some embodiments of the present invention, in some embodiments, A mounting hole is formed in one side, close to the first guide piece, of the rod body; The second guide includes: The body is connected with the rod body, and one side of the body, far away from the rod body, is used for being abutted with the first guide piece; The positioning protrusion is connected to one side, far away from the first guide piece, of the body, is inserted into the mounting hole and is connected with the rod body. In some embodiments, the diameter of the first guide is equal to the aperture of the through hole. In some embodiments, the piston head, the first guide, and the through bore are concentric about a central axis. In some embodiments, the piston head is positioned within the through bore when the piston rod is moved to a furthest distance in the axial direction. In some embodiments, the outer diameter of the piston rod is smaller than the bore diameter of the through bore. In some embodiments, the diaphragm compressor further comprises: The air side membrane head is connected with the oil side membrane head and is arranged at one side of the oil side membrane cavity far away from the through hole; The membrane is arranged between the gas side membrane head and the oil side membrane head and respectively covers the gas side membrane cavity and the oil side membrane cavity with the gas side membrane head and the oil side membrane head; The driving structure is arranged on one side, far away from the air side membrane head, of the oil side membran