CN113027760A

CN113027760A - Shaft type fixed piston for air compressor and air compressor with same

Info

Publication number: CN113027760A
Application number: CN202110318809.9A
Authority: CN
Inventors: 郭金涛
Original assignee: Individual
Current assignee: Beijing Xuanhuan Technology Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-06-25
Anticipated expiration: 2041-03-25
Also published as: CN113027760B

Abstract

The invention discloses a shaft type fixed piston, which is in a semi-cylindrical shape, wherein a second piston shaft is arranged at the middle part in the axial direction of the shaft type fixed piston; the outer edge of the sealing knife part is arc-shaped, and a tangent sealing line is formed by the arc and the arc on the front surface of the rotor ring. The invention also discloses an air compressor, which comprises a shell assembly, a rotor assembly arranged in the shell assembly and a shaft type fixed piston assembly arranged at the top of the shell. The air compressor divides an annular air cylinder formed by a rotor and a shell ring into two relatively independent and airtight spaces by utilizing the matching of a first piston and a shaft type fixed piston; the rotor shaft where the first piston is located and the camshaft controlling the movement of the shaft type fixed piston are in transmission connection through a gear belt, when the first piston rotates clockwise, two spaces of the annular cylinder are reduced and expanded one by one, and gas compression is completed while air suction is performed.

Description

Shaft type fixed piston for air compressor and air compressor with same

Technical Field

The invention relates to the field of air compressors, in particular to a shaft type fixed piston for an air compressor and the air compressor.

Background

An air compressor, called an air compressor for short, is a device for converting mechanical energy of a motor or an engine into pressure energy or kinetic energy, and belongs to general machinery. The existing types of air compressors are reciprocating piston, diaphragm, screw, slide, centrifugal, axial. The common compressors are mainly reciprocating piston compressors, screw compressors, sliding vane compressors and centrifugal compressors.

EP2356317B1 discloses a rotary piston engine comprising a housing, an inlet port and an outlet port, said housing accommodating a cylindrical rotor in a given Direction of Rotation (DR) about a direction of rotation axis, at least one rotary piston, and at least one counter piston. However, the device is complicated in structure, difficult to control and implement, and insufficient in sealing effect.

CN203604149U discloses an air compressor piston, including piston body, spring, jump ring and buffer board, set up the spring between the inner chamber of piston body and buffer board to the pressure that produces to air compressor piston roof when buffer piston moves down. However, this device cannot create an effective pressure in the body, and cannot allow the gas entering from the gas inlet to completely enter the gas outlet.

Therefore, the shaft type fixed piston and the shaft type fixed piston rotor air compressor with high air tightness, high efficiency and low energy consumption are needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a shaft type fixed piston for an air compressor and the air compressor thereof, wherein the shaft type fixed piston is simple in structure, low in cost, high in efficiency and strong in air tightness.

A shaft type fixed piston for a rotor air compressor is of a semi-cylindrical shape and is arranged in a concave part of a second piston base, a second piston shaft is arranged along the middle part of the shaft type fixed piston in the axial direction and used for enabling the shaft type fixed piston to rotate along the shaft type fixed piston, and two ends of the second piston shaft are embedded into a groove in the inner wall of a second shell; the shaft type fixed piston is provided with a gap along the axial direction, and the sharp part of the gap forms a sealing knife; the end part of the sealing knife is tangent to the outer wall of the rotor body.

The air compressor utilizing the shaft type fixed piston comprises a shell assembly, a rotor assembly arranged inside the shell assembly and a shaft type fixed piston assembly arranged at the top of the shell. The housing assembly comprises a housing ring and two oppositely arranged annular housing side walls connected with the annular edge of the housing ring; the top of the shell ring is provided with a concave second piston base, the size and shape of the concave part of the concave second piston base are the same as the size of the excircle of the shaft type fixed piston, the second piston base is provided with a notch penetrating through the shell ring, and the notch is arranged along the axial direction of the shell ring; and the shell ring is provided with an air inlet and an air outlet which are respectively positioned at two sides of the second piston base.

The rotor assembly includes a rotor body supported by and rotatable along a rotor shaft extending through the rotor body along an axis of the rotor body; one end of the rotor shaft is connected with a power source, and the other end of the rotor shaft is provided with a gear; both ends of the rotor body have flanges extending circumferentially outward at the ends of the rotor body. The side wall of the rotor body is provided with a first piston, two far ends of the first piston respectively abut against the flange, and the height of the first piston is the same as the height of the flange extending out of the rotor body.

The shaft type fixed piston assembly comprises a second shell, a shaft type fixed piston, a cam shaft and a return spring; the shaft type fixed piston is arranged in a concave part of a second piston base, and the second shell is connected with the second piston base in a matching way; the camshaft is arranged in a camshaft mounting hole in the inner wall of the second shell; two ends of the second piston shaft are embedded into the grooves in the inner wall of the second shell; the reset spring is arranged in a cavity between the shaft type fixed piston and the inner wall of the second shell, and the camshaft and the reset spring are matched to drive the shaft type fixed piston to axially reciprocate, so that the sealing knife is tangent to the excircle of the rotor body and the inner wall of the flange, and the first piston passes through the opening and the sealing knife.

Furthermore, a gap between the inner wall of the shell assembly and the rotor assembly forms a closed annular cylinder, the annular width of the annular cylinder is the same as the height of a first piston arranged on the side wall of the rotor assembly, the first piston and the shaft type fixed piston are matched to rotate to divide the annular cylinder into two independent cavities which are not communicated, and the spaces of the two independent cavities are changed in an equal ratio along with the rotation of the rotor body.

Further, the rotor shaft, the second piston shaft and the camshaft are arranged in parallel.

Furthermore, a pair of second piston shaft sleeves which are oppositely arranged along the axial direction of the shell ring is arranged at two ends of the inner side wall of the second piston base and used for installing the shaft type fixed piston.

Further, the camshaft is in transmission connection with the rotor shaft through a gear belt outside the second shell.

Furthermore, the return spring is fixed through a ball column pair, and the ball column pair is correspondingly arranged on the upper surface of the shaft type fixed piston and the top of the inner side of the second shell respectively.

Further, the first piston is a protrusion extending axially on a side wall of the rotor body.

Furthermore, the outer edge of the sealing knife part of the shaft type fixed piston, which is cut into the annular cylinder, is arc-shaped, and the arc on the front surface of the rotor ring form a tangent sealing line.

The structure of the axial fixed piston and the rotor air compressor thereof can be expanded to the application of an engine and a vacuum pump, and the cylinder number of the air compressor can be expanded to 2 cylinders or multiple cylinders.

The invention has good expansibility, the structure can be used for compressing air and can also be used for a vacuum pump, and the expanded invention can also be used for a fuel oil or gas engine by matching with a corresponding combustion part.

Compared with the prior art, the embodiment of the invention has the beneficial effects and obvious progress that:

the shaft type fixed piston rotor air compressor divides an annular air cylinder formed by a rotor and a shell ring into two relatively independent and airtight spaces A and B by utilizing the matching of a first piston and a shaft type fixed piston; the rotor shaft where the first piston is located is in transmission connection with the camshaft controlling the movement of the shaft type fixed piston through a gear belt, when the first piston rotates clockwise, two spaces of the annular cylinder are reduced and expanded one by one, and gas compression is completed while air suction is performed. The compressed gas is discharged out of the apparatus through a gas outlet valve. The invention has the advantages of simple structure, small volume, high efficiency, low noise, strong air tightness and wide application prospect.

Drawings

FIG. 1 is a schematic structural diagram of a rotor air compressor according to the present invention;

fig. 2 shows a housing assembly of the rotor air compressor according to the present invention, wherein fig. 2a is a schematic structural diagram of the housing assembly; FIG. 2b is a schematic structural view of the housing ring and shaft-type stationary piston base in the housing assembly; FIG. 2c is a schematic view of the housing side wall of the housing assembly;

fig. 3 shows a rotor assembly of the rotor air compressor according to the present invention, wherein fig. 3a is a schematic structural view of the rotor assembly; FIG. 3b is a schematic view of a rotor ring; FIG. 3c is a schematic view of a first piston; FIG. 3d is a schematic view of a rotor shaft; FIG. 3e is a rotor side schematic view;

fig. 4 shows a shaft type fixed piston assembly of the rotor air compressor of the present invention, wherein fig. 4a is a schematic structural view of the shaft type fixed piston assembly; FIG. 4b is a schematic view of an axial fixed piston; FIG. 4c is a schematic view of a return spring; FIG. 4d is a schematic view of an axial fixed piston camshaft; FIG. 4e is a schematic view of the shaft-type stationary piston housing;

fig. 5 is a schematic view of the working principle of the rotor air compressor according to the present invention.

In the figure:

1: rotor air compressor

2: shell assembly

2.1: outer casing ring

2.2: side wall of the housing

2.3: air compressor base

2.4: second piston base

2.6: notch opening

2.7: second piston sleeve

2.8: air inlet

2.9: air outlet

3: rotor body

3.1: rotor ring

3.2: first piston

3.3: rotor shaft

3.4: rotor side

3.5: annular cylinder

3.6: first piston mounting groove

4: shaft type fixed piston assembly

4.1: shaft type fixed piston

4.2: sealing knife

4.3: opening of the container

4.4: second piston shaft

4.5: cam shaft

4.6,4.7: camshaft mounting hole

4.8: reset spring

4.9: ball column pair

4.10: second housing

4.11: second housing cavity

Detailed Description

In order to make the objects, technical solutions, advantages and significant progress of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings provided in the embodiments of the present invention, and it is obvious that all of the described embodiments are only some embodiments of the present invention, not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "fixed," "connected," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected or movably connected, or may be integrated; the connection may be direct, indirect through an intermediate medium, or intangible signal connection, and may be a connection within two elements or an interaction relationship between two elements; unless otherwise specifically defined, specific meanings of the above terms in the present invention can be understood as specific conditions by those of ordinary skill in the art.

It should be noted that the terms "first", "second", "third", etc. in the description and claims of the present invention are used for distinguishing different objects, and are not used for describing a specific order.

It should be further noted that the following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

As shown in fig. 1-5, the shaft type fixed piston rotor air compressor comprises a shell assembly 2, a rotor assembly and a shaft type fixed piston assembly 4 mounted on the shell. As shown in fig. 2a-2c, the housing assembly 2 comprises a housing ring 2.1 and two opposite annular housing side walls 2.2 connected to the annular rim thereof, the housing side walls 2.2 serving to fix the position of the rotor so that the rotor does not shift position. The bottom of the shell ring is provided with an air compressor base 2.3, and the base is used for fixing the air compressor when needed. The top of the outer shell ring is provided with a concave second piston base 2.4, the size and shape of the concave part of the outer shell ring are the same as the size of the excircle of the shaft type fixed piston, the second piston base 2.4 is provided with a notch penetrating through the outer shell ring, and the notch is arranged along the axial direction of the outer shell ring; and a pair of second piston shaft sleeves 2.7 which are oppositely arranged along the axial direction of the shell ring 2.1 are arranged at two ends of the inner side wall of the second piston base 2.4 and used for installing the shaft type fixed piston 4.1. And the shell ring 2.1 is provided with an air inlet 2.8 and an air outlet 2.9 which are respectively positioned at two sides of the second piston base 2.4.

As shown in fig. 3a-3e, the rotor assembly comprises a rotor body 3, the rotor body 3 comprising a rotor ring 3.1, two rotor sides 3.4, a first piston 3.2 and a rotor shaft 3.3. And a first piston mounting groove 3.6 is formed in the outer wall of the rotor ring 3.1 along the axial direction of the rotor ring and is used for fixedly connecting the first piston 3.2, and the height of the first piston 3.2 is equal to the height of the flanges 3.7 of the two rotor sides 3.4. Rotor sides 3.4 are installed on two sides of the rotor ring 3.1, the rotor sides 3.4 are disc-shaped, the diameter of each disc-shaped rotor side is larger than that of the rotor ring, the disc-shaped rotor sides and the rotor ring are installed in a concentric circle mode, and two circular-ring-shaped flanges 3.7 are formed on two sides of the rotor ring. The two flanges 3.7 cooperate with the outer wall of the rotor ring to form an annular groove, which cooperates with the housing ring to form a closed annular cylinder 3.5. The rotor shaft 3.3 is fixedly arranged at the center of the rotor side 3.4, penetrates through the rotor ring 3.1 and keeps concentric with the rotor ring 3.1. The rotor shaft 3.3 extends through the rotor body 3. One end of the rotor shaft 3.3 is connected with a power source, and the other end is provided with a gear which is connected with a gear on the second piston camshaft 4.5 through a gear belt.

The rotor assembly is concentrically arranged in the shell assembly, a gap between the inner wall of the shell assembly and the rotor assembly forms a closed annular cylinder 3.5, the annular width of the annular cylinder 3.5 is the same as the height of a first piston arranged on the side wall of the rotor body 3, the first piston 3.2 and the shaft type fixed piston 4.1 are matched to rotate to divide the annular cylinder 3.5 into two independent and non-communicated cavities, and the spaces of the two independent cavities are changed in an equal ratio along with the rotation of the rotor body.

As shown in fig. 4a-4e, the shaft-type fixed piston assembly 4. The shaft type fixed piston assembly comprises a second shell 4.10, a shaft type fixed piston 4.1, a camshaft 4.5, a return spring 4.8 and a ball column pair 4.9. The second outer shell 4.10 and the second piston base 2.4 are connected in a matched mode and are sealed; the shaft type fixed piston 4.1 is a semi-cylindrical shape and is arranged in the concave part of the second piston base 2.4, a second piston shaft 4.4 is arranged at the middle part of the shaft type fixed piston 4.1 along the axial direction of the shaft type fixed piston, and two ends of the second piston shaft 4.4 are embedded into the groove of the inner wall of the second shell 4.10; the shaft type fixed piston is provided with a gap 4.3 along the axial direction for the first piston to pass through, and the sharp part of the gap 4.3 forms a sealing knife 4.2 (edge); the end part of the sealing knife 4.2 is tangent to the outer wall of the rotor body 3 to form a sealing line, and the side wall of the shaft type fixed piston 4.1 is tangent to the inner part of the side wall of the rotor body to form a sealing surface. The sealing knife 4.2 cuts into the annular cylinder 3.5 through the slot 2.6 and is tangent to the front face of the rotor ring 3.1 and the two rotor side flanges 3.7, and an airtight state is achieved. The camshaft 4.5 and the return spring 4.8 are matched to enable the shaft type fixed piston 4.1 to be tangent to the outer circle of the rotor body and the inner wall of the flange through the opening 4.3, and therefore the shaft type fixed piston is opened and closed. The outer edge of the part, cut into the annular cylinder 3.5, of the sealing knife 4.2 of the shaft type fixed piston 4.1 module is a section of circular arc, and the circular arc and the front circular arc of the rotor ring 3.1 form a tangent line and a tangent sealing line. The axial reciprocating movement of the sealing knife ensures the sealing effect and at the same time can absolutely avoid the possible impact of the shaft-type fixed piston and the rotor ring 3.1.

Two opposite inner side walls of the shaft type fixed piston shell 4.10 are respectively provided with symmetrically arranged camshaft mounting holes 4.6 and 4.7 for mounting the camshaft 4.5, and the camshaft 4.5 rotates through a gear belt outside the second shell. The rotor shaft 3.3, the second piston shaft 4.4 and the camshaft 4.5 are arranged in parallel. The reset spring 4.8 is arranged in a cavity between the shaft type fixed piston and the inner wall of the second shell and is fixed through a ball column pair 4.9; the shaft type fixed piston shell 4.10 is provided with a second shell inner cavity 4.11, the top of the 4.11 of the second shell inner cavity is provided with at least one return spring ball seat pair 4.9, and the other ball seat pair is correspondingly arranged on the upper surface of the shaft type fixed piston 4.1. After the camshaft 4.5 is installed, the installation hole 4.7 at one end of the camshaft is sealed by a sealing bearing.

During assembly, the rotor assembly is continuously assembled with the shell ring after the assembly of the rotor assembly is completed. When the rotor assembly is tightly matched with the housing ring, the annular cylinder of the rotor assembly is matched with the housing ring to form an airtight annular cylinder, and then the shaft type fixed piston assembly is installed in the second piston base at the top of the housing ring. After the camshaft and the return spring are mounted in place, the second housing is connected and fixed in a fitting manner with the second piston base.

As shown in fig. 5, the second piston base 2.4 is provided with an air inlet 2.8 and an air outlet 2.9 on both sides. The shaft-type stationary piston 4.1 cuts into the annular cylinder 3.5 through a slot 2.6 in the second piston base 2.4 and the sealing knife 4.2 is tangential to the rotor ring 3.1 and the flange 3.7 of the rotor side 3.4 and is in a gas-tight state. The top face of the first piston 3.2 is tangent to the inner front face of the housing ring 2.1 and forms a gas-tight condition. The axially fixed piston 4.1 and the first piston 3.2 divide the annular cylinder 3.5 into a region a and a region B, the size of the two relatively independent regions varying with the rotation of the first piston. Zone a is from the shaft-wise stationary piston 4.1 to the first piston 3.2 and zone B is from the first piston 3.2 to the shaft-wise stationary piston 4.1. The rotor assembly rotates clockwise. When the first piston 3.2 is positioned at the air inlet end, the shaft type fixed piston 4.1 is in a sealed state, the air inlet valve is opened, the first piston 3.2 rotates clockwise, the annular cylinder space A of the first piston 3.2 and the shaft type fixed piston 4.1 is gradually enlarged, and air suction action is finished; meanwhile, at the air outlet end, the air outlet 2.9 is in a closed state, and as the first piston 3.2 approaches the shaft type fixed piston 4.1, the space of the annular cylinder 3.5 between the first piston 3.2 and the shaft type fixed piston 4.1 is gradually reduced, so that air is compressed. When the first piston 3.2 is close to the shaft type fixed piston 4.1, the air outlet 2.9 is opened, compressed air is discharged out of the annular cylinder 3.5, after the air exhaust is completed, the sealing knife 4.2 of the shaft type fixed piston 4.1 rotates anticlockwise under the action of the cam shaft 4.5 of the shaft type fixed piston 4.1, the sealing knife is lifted and pressed towards the direction of the return spring 4.8, and meanwhile, the first piston 3.2 passes through the gap 4.3 through which the first piston passes through and passes through the shaft type fixed piston 4.1; after the first piston 3.2 passes through, the sealing knife 4.2 rebounds back to the annular cylinder groove by the return spring 4.8 to form a sealing state with the rotor ring 3.1 again. And simultaneously, the air inlet valve is opened, the air outlet valve is closed, and the air compressor enters the next working cycle of air suction and compression. The arrows in the inlet 2.8 and outlet 2.9 indicate the direction of flow of the gas and the arrows around the rotor shaft 3.3 indicate the direction of rotation of said rotor shaft.

In practical application, each part of the shell assembly, the rotor assembly and the shaft type fixed piston assembly can be formed by casting or small-amount machining after casting, and can also be assembled by using each part.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the foregoing embodiments may be modified, or part or all of the technical features may be equivalently replaced, without departing from the spirit of the present invention, and that the present invention shall not be limited to the specific embodiments or the specific examples.

Claims

1. A shaft-type stationary piston for a rotor air compressor, characterized in that the shaft-type stationary piston (4.1) is of a semi-cylindrical type, the shaft-type stationary piston (4.1) being provided with a second piston shaft (4.4) along its axial middle portion for rotating the shaft-type stationary piston (4.1) therealong; the shaft type fixed piston (4.1) is provided with a gap (4.3) along the axial direction, and the sharp part of the gap (4.3) forms a sealing knife (4.2).

2. An air compressor utilizing a shaft fixed piston as claimed in claim 1, including a housing assembly, a rotor assembly disposed within said housing assembly and a shaft fixed piston assembly mounted on top of the housing;

the housing assembly comprises a housing ring (2.1) and two oppositely arranged annular housing side walls (2.2) connected with the annular edge of the housing ring; the top of the shell ring (2.1) is provided with a concave second piston base (2.4), the size and shape of the concave part of the second piston base are the same as the size of the excircle of the shaft type fixed piston (4.1), the second piston base (2.4) is provided with a notch (2.6) penetrating through the shell ring, and the notch (2.6) is arranged along the axial direction of the shell ring (2.1); the shell ring (2.1) is provided with an air inlet (2.8) and an air outlet (2.9) which are respectively positioned at two sides of the second piston base (2.4);

the rotor assembly comprises a rotor body (3), the rotor body (3) is supported by a rotor shaft (3.3) and rotates along the rotor shaft (3.3), and the rotor shaft (3.3) penetrates through the rotor body along the axis of the rotor body (3); both ends of the rotor body (3) have flanges (3.7), the flanges (3.7) extending outward in the circumferential direction at the ends of the rotor body (3); a first piston (3.1) is arranged on the side wall of the rotor body, two far ends of the first piston respectively abut against the flange, and the height of the first piston is the same as the height of the flange extending out of the rotor body;

the shaft type fixed piston assembly comprises a second shell (4.10), a shaft type fixed piston (4.1), a cam shaft (4.5) and a return spring (4.8); the shaft type fixed piston (4.1) is arranged in an inner concave part of a second piston base (2.4), and the second shell (4.10) is connected with the second piston base (2.4) in a matching way; the camshaft (4.5) is arranged in a camshaft mounting hole (4.6, 4.7) on the inner wall of the second housing; both ends of the second piston shaft (4.4) are embedded into grooves in the inner wall of the second shell (4.10); the reset spring (4.8) is arranged in a cavity between the shaft type fixed piston (4.1) and the inner wall of the second shell, the camshaft (4.5) and the reset spring (4.8) are matched to drive the shaft type fixed piston (4.1) to axially reciprocate, so that the sealing knife (4.2) is tangent to the outer circle of the rotor body (3) and the inner wall of the flange, and the first piston (3.1) passes through the notch (4.3) and the sealing knife (4.2).

3. The air compressor according to claim 2, characterized in that the gap between the inner wall of the housing assembly and the rotor assembly forms a closed annular cylinder (3.5), the annular cylinder (3.5) has the same annular width as the height of a first piston (3.2) arranged on the side wall of the rotor assembly, the first piston (3.2) and the shaft type fixed piston (4.1) are matched to rotate to divide the annular cylinder (3.5) into two independent and non-communicated cavities, and the spaces of the two independent cavities change in an equal ratio along with the rotation of the rotor body.

4. The air compressor as claimed in claim 2, characterized in that the second piston base (2.4) is provided at both ends of its inner side wall with a pair of second piston bosses (2.7) disposed oppositely in the axial direction of the housing ring for mounting the shaft-type fixed piston (4.1).

5. An air compressor according to claim 2, characterized in that one end of the rotor shaft (3.3) is connected to a power source and the other end is provided with a gear; the camshaft (4.5) is in drive connection with the rotor shaft (3.3) via a toothed belt outside the second housing (4.10).

6. The air compressor according to claim 2, characterized in that the return spring (4.8) is fixed by a ball-column pair (4.9), the ball-column pair (4.9) being respectively and correspondingly arranged on the upper surface of the shaft-type fixed piston (4.1) and the inside top of the second housing (4.10).

7. The air compressor according to claim 2, characterized in that the first piston (3.1) is a projection extending axially on the side wall of the rotor body (3).

8. The air compressor according to claim 2, characterized in that the outer edge of the sealing knife (4.2) part of the shaft-like fixed piston (4.1) that cuts into the annular cylinder (3.5) is circular-arc shaped, which forms a tangential sealing line with the front circular arc of the rotor ring (3.1).