Machine head of air compressor with oil

Abstract

The utility model provides an oiled air compressor head which solves the problem that an existing head is complex in appearance. The oiled air compressor head comprises a box body and at least two air cylinders evenly distributed outside the box body in the circumferential direction, each air cylinder is provided with a cylinder cover, a crank is horizontally arranged in the box body, the crank drives the air cylinders to operate through a connecting rod, the front end of the crank extends out of the box body, the machine head further comprises a shell and a motor, and the motor and the box body are both arranged in the shell. The motor is used for driving the crank to rotate, the motor is further provided with an axial-flow fan blade driven by the motor to rotate, and the air cylinder is arranged right opposite to the axial-flow fan blade so that wind energy generated by the axial-flow fan blade can be directly blown to the air cylinder. An air inlet and an air outlet are formed in the front side and the rear side of the shell respectively; strip-shaped concave cavities are formed in the inner wall of the rear side of the box body, the number of the strip-shaped concave cavities is the same as that of the air cylinders, the front sides and the bottoms of the strip-shaped concave cavities are open, the cylinder covers are arranged in the corresponding strip-shaped concave cavities respectively, and exhaust ports are formed in the rear sides of the strip-shaped concave cavities. The oiled air compressor head is simple in appearance.

Description

Technical Field

[0001] The utility model belongs to the field of air compression equipment, and relates to an oil-injected air compressor, in particular to an oil-injected air compressor head. Background Technique

[0002] The oil-injected air compressor head is a key component in the air compressor system. It is responsible for converting the mechanical energy of a prime mover such as an electric motor or a diesel engine into the pressure energy of the gas. During the operation of this type of air compressor, lubricating oil is used to reduce friction, cool components, and seal the gas inside the head.

[0003] An existing oil-injected air compressor, such as a three-cylinder linked high-efficiency micro air compressor pump head (application number: 201821895160.7) disclosed in the Chinese patent database, includes a crankcase and cylinders provided on the crankcase. It is characterized in that: the cylinders are divided into a first cylinder, a second cylinder, and a third cylinder. Front bearings and rear bearings are respectively provided on both sides inside the crankcase. A rotatable crankshaft is arranged on the front bearing and the rear bearing. The outer end of the crankshaft is connected to an external pulley. Front covers and rear covers are respectively provided on both sides of the crankcase. An annular oil seal is provided at the connection between the front cover and the crankshaft. A breather is provided on the top of the front cover. The crankshaft is respectively connected to piston pins arranged in the first cylinder, the second cylinder, and the third cylinder through a first connecting rod, a second connecting rod, and a third connecting rod. Pistons are arranged on the piston pins. The first cylinder, the second cylinder, and the third cylinder are all provided with cylinder heads. An air filter and an exhaust pipe joint are provided on the cylinder head. The exhaust pipe joints are connected through an exhaust pipe. An oil filling hole is provided on the top of the crankcase, an oil level gauge is provided on the side, and an oil drain hole is provided at the bottom.

[0004] The above pump head is used in cooperation with an external motor, and the motor drives the pump head to operate through a belt drive mechanism. Among them, the pump head, the motor, and the belt drive mechanism are all independently arranged outside, resulting in a relatively complex and unattractive appearance of the air compressor. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose an oil-injected air compressor head with a simple appearance.

[0006] The object of the present utility model can be achieved by the following technical solutions: An oil-injected air compressor head includes a box body and at least two cylinders circumferentially and evenly distributed outside the box body. Each cylinder is provided with a cylinder head. A crank is horizontally arranged in the box body, and the crank drives the cylinders to operate through connecting rods. The number of connecting rods is the same as that of the cylinders and their positions correspond one by one. The front end of the crank extends out of the box body. Its characteristics are that this head further includes a housing and a motor. The motor and the box body are both arranged in the housing, and the motor and the box body are arranged in sequence along the axial direction of the crank before and after; the motor is used to drive the crank to rotate, and an axial flow fan blade driven by the motor is also arranged on the motor. The cylinders are arranged facing the axial flow fan blade so that the wind generated by the axial flow fan blade can directly blow towards the cylinders; an air inlet and an air outlet are respectively arranged on the front side and the rear side of the housing; a strip-shaped concave cavity is formed on the inner wall of the rear side of the box body, and the length of the strip-shaped concave cavity extends back and forth. The number of strip-shaped concave cavities is the same as that of the cylinders. The front side and the bottom of the strip-shaped concave cavity are both open. Each cylinder head is respectively arranged in the corresponding strip-shaped concave cavity, and an exhaust port is arranged on the rear side of the strip-shaped concave cavity.

[0007] The motor, the box body, the cylinders and the cylinder heads are all hidden in the housing, presenting the whole head in the shape of the housing, effectively enhancing the simplicity and beauty of the head's appearance.

[0008] In the above-mentioned oil-injected air compressor head, the air inlet and the air outlet are respectively arranged facing the motor and the box body.

[0009] An axial flow fan blade that makes the wind directly blow towards the cylinders is arranged on the motor, and the wind is guided through the strip-shaped concave cavity, greatly increasing the contact duration and area between the wind and the cylinders and the end covers, thereby effectively accelerating the heat dissipation of the cylinders and the cylinder heads and ensuring the service life and working stability of the head.

[0010] At the same time, the air inlet and the air outlet are respectively arranged facing the motor and the box body, so that the wind can better contact the motor and the box body during the flowing process to accelerate the heat dissipation of the motor and the box body, thereby further ensuring the service life and working stability of the head.

[0011] In the above-mentioned oil-injected air compressor head, the type of the above-mentioned motor is an external rotor motor. The external rotor motor is composed of a stator assembly fixed on the box body and a rotor assembly arranged outside the stator assembly. The rotor assembly is composed of a cylindrical rotor frame and a ring of magnetic steel arranged inside the rotor frame. The above-mentioned axial flow fan blade is arranged outside the rotor frame, and the front end of the crank extends into the stator assembly and is fixedly connected to the above-mentioned rotor frame. The use of an external rotor motor for the motor is not only convenient for installation, but also the external rotor motor itself is designed compactly, so as to effectively reduce the space it occupies, reduce the volume of the housing, and reduce the space occupied by the head.

[0012] At the same time, the front end of the crank directly extends into the stator assembly and is fixedly connected to the rotor frame, so that the front end of the crank replaces the motor rotor shaft. That is, in this application, the crank and the rotor shaft are the same component, so as to further shorten the distance between the motor and the box body, make the structure of the head more compact, and reduce the space occupation.

[0013] In the above-mentioned oil-injected air compressor head, the axial-flow fan blade includes an annular base body and a circle of blades integrally formed on the outer wall of the base body, and the front end of the rotor frame is the above-mentioned base body. That is, in the present application, the axial-flow fan blade and the rotor frame are an integral part, which not only facilitates processing and assembly, but also is beneficial to the stable rotation of the axial-flow fan blade and enhances the heat dissipation effect.

[0014] In the above-mentioned oil-injected air compressor head, a bushing coaxial with the crank is provided inside the stator assembly. The rear end of the bushing is sleeved and fixed on the front end of the crank, and the front end of the bushing is fixedly connected to the rotor frame. The crank is fixedly connected to the rotor frame by means of the bushing, which is convenient for the design and processing of the rotor frame.

[0015] In the above-mentioned oil-injected air compressor head, the outer wall of the front end of the crank and the inner wall of the rear end of the bushing are in close contact and cooperation through a conical surface, so as to effectively enhance the coaxiality of the connection between the crank and the bushing and improve the operation stability and accuracy of the head.

[0016] In the above-mentioned oil-injected air compressor head, an exhaust pipe is also provided inside the housing. The air outlet holes of each cylinder head are all communicated with the inner hole of the exhaust pipe, and one end of the exhaust pipe extends out of the housing to facilitate the connection of the head to the air storage tank.

[0017] In the above-mentioned oil-injected air compressor head, the air outlet hole and the air inlet hole of the cylinder head are respectively arranged forward and backward, and the exhaust pipe is arranged between the cylinder and the axial-flow fan blade. The exhaust pipe is arranged between the cylinder and the axial-flow fan blade, which can reduce the temperature of the compressed air in the exhaust pipe; the air inlet hole of the cylinder head is arranged backward, which can reduce the temperature of the gas entering the cylinder head and reduce the heat generated during the operation of the cylinder.

[0018] In the above-mentioned oil-injected air compressor head, a through hole is horizontally penetrated on the side wall of the lower end of the box body, an oil sight glass is installed in the through hole, and an observation port is horizontally penetrated on the side wall of the housing opposite to the oil sight glass, so that the operator can view the oil level in the box body through the observation port outside the housing, which is convenient for use.

[0019] In the above-mentioned oil-injected air compressor head, an installation hole is also penetrated on the side wall of the lower end of the box body. A liquid level sensor is provided outside the box body. The liquid level sensor includes a rod-shaped main body. One end of the main body is a detection end. The detection end passes through the installation hole and is located inside the box body, and the position of the detection end is lower than the center point position of the through hole. The main body is fixedly connected to the box body in a sealed manner. The liquid level sensor is provided, and the position of the detection end is lower than the center point position of the through hole. In this way, when in actual use, the liquid level sensor is connected to the controller to actively remind the user that the oil in the box body is insufficient, avoiding dry burning of the head due to negligence and effectively ensuring the service life of the head.

[0020] In the above-mentioned oil-injected air compressor head, the type of the installation hole is a threaded hole, and the main body is screwed into the installation hole, which effectively facilitates the installation of the liquid level sensor.

[0021] In the above-mentioned oil-injected air compressor head, the installation holes are arranged obliquely downward, which is beneficial to processing.

[0022] In the above-mentioned oil-injected air compressor head, a ring-shaped limit seat is formed on the outer wall of the main body, and the limit seat presses against the outer wall of the box body, so that the main body can be screwed in place at one time, further facilitating assembly.

[0023] In the above-mentioned oil-injected air compressor head, an annular groove coaxial with the limit seat is formed on the end face of the limit seat. An annular gasket is arranged in the annular groove, and both end faces of the gasket are tightly pressed against the bottom wall of the annular groove and the edge of the installation hole respectively. Under the action of the gasket, the sealing performance formed between the main body and the box body is effectively enhanced.

[0024] As another solution, in the above-mentioned oil-injected air compressor head, an annular positioning groove is formed on the outer side wall of the main body. An O-ring is arranged in the positioning groove, and the outer peripheral surface of the O-ring presses against the hole wall of the installation hole.

[0025] In the above-mentioned oil-injected air compressor head, an oil hole is further arranged on the side wall at the lower end of the box body, and the oil hole is arranged close to the bottom wall of the box body; a oil pipe is horizontally fixed in the outer shell, the inner end of the oil pipe is communicated with the oil hole, the outer end of the oil pipe extends out of the outer shell, and a plugging member for closing the outer end port of the oil pipe is detachably fixed on the outer end of the oil pipe. Under the action of the oil pipe, the oil hole is extended to the outside of the outer shell, facilitating oil discharge.

[0026] In the above-mentioned oil-injected air compressor head, the head further includes a circuit board, and the circuit board is arranged in the outer shell and vertically arranged between the air inlet and the motor.

[0027] Compared with the prior art, the above-mentioned oil-injected air compressor head has the following advantages:

[0028] 1. The motor, the box body, the cylinder and the cylinder head are all hidden in the outer shell, so that the whole head presents the shape of the outer shell, effectively enhancing the simplicity and beauty of the head shape.

[0029] 2. Axial flow blades for directly blowing air to the cylinder are arranged on the motor, and the air is guided through the strip-shaped concave cavity, greatly increasing the contact time and area between the air and the cylinder and the end cover, thereby effectively accelerating the heat dissipation of the cylinder and the cylinder head and ensuring the service life and working stability of the head.

[0030] 3. The air inlet and the air outlet are respectively arranged opposite to the motor and the box body, so that the air can better contact with the motor and the box body during the flowing process, so as to accelerate the heat dissipation of the motor and the box body, thereby further ensuring the service life and working stability of the head.

[0031] 4. The outer rotor motor is adopted for the motor, which is not only convenient for installation, but also the outer rotor motor itself is designed compactly, so as to effectively reduce the space occupied by it, reduce the volume of the outer shell, and reduce the space occupied by the head. Description of the Drawings

[0032] Figure 1 It is a three-dimensional schematic diagram of the head of the present oil-injected air compressor.

[0033] Figure 2 It is a three-dimensional schematic diagram of the head of the present oil-injected air compressor in another direction.

[0034] Figure 3 It is a schematic diagram of the position distribution of the motor and the box body.

[0035] Figure 4 It is a sectional schematic diagram of the head of the present oil-injected air compressor.

[0036] Figure 5 It is a schematic diagram of the structure of the inner wall of the outer shell.

[0037] Figure 6 It is a sectional schematic diagram of the box body.

[0038] Figure 7 It is Figure 6 an enlarged schematic diagram of part A in

[0039] In the figure, 1 is the box body; 2 is the cylinder; 3 is the cylinder head; 4 is the crank; 5 is the connecting rod; 6 is the outer shell; 6a is the air inlet; 6b is the air outlet; 6c is the observation port; 6d is the strip-shaped concave cavity; 6e is the exhaust port; 7 is the motor; 7a is the stator assembly; 7b is the rotor frame; 8 is the axial flow fan blade; 8a is the blade; 9 is the shaft sleeve; 10 is the exhaust pipe; 11 is the oil pipe; 12 is the plugging member; 13 is the oil level gauge; 14 is the liquid level sensor; 14a is the main body; 14a1 is the detection end; 14a2 is the limit seat; 15 is the gasket; 16 is the circuit board. Specific Embodiments

[0040] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments. Embodiment 1

[0041] As Figure 1 , Figure 3 and Figure 4 shown, the head of the present oil-injected air compressor includes a box body 1 and at least two cylinders 2 circumferentially and evenly distributed outside the box body 1, and a cylinder head 3 is provided on each cylinder 2. A crank 4 is horizontally arranged in the box body 1, and the crank 4 drives the cylinder 2 to operate through a connecting rod 5. The number of the connecting rods 5 and the cylinders 2 is the same and the positions correspond one by one. The front end of the crank 4 is a shaft member, and the front end of the crank 4 extends out of the box body 1. Among them, both ends of the crank 4 are rotationally supported on the box body 1 through bearings; the structures and connection methods of the cylinder 2, the cylinder head 3, the crank 4 and the connecting rod 5 are all existing and will not be elaborated here. In this embodiment, the number of cylinders is 3, that is, the type of the present oil-injected air compressor is a three-cylinder oil-injected air compressor.

[0042] Specifically,

[0043] The machine head further includes a housing 6 and a motor 7. The motor 7, the box body 1, the cylinder 2, and the cylinder head 3 are all arranged inside the housing 6, and the motor 7 and the box body 1 are arranged in sequence along the axial direction of the crank 4 from front to back. Among them, the motor 7 is used to drive the crank 4 to rotate. An axial flow fan blade 8 driven by the motor 7 is also arranged on the motor 7, and the axial flow fan blade 8 and the motor 7 are coaxially arranged. As Figures 1 to 3 shown, the cylinder 2 is arranged opposite to the axial flow fan blade 8 so that the wind energy generated by the axial flow fan blade 8 can directly blow towards the cylinder 2; an air inlet 6a and an air outlet 6b are respectively arranged on the front side and the rear side of the housing 6, and the air inlet 6a and the air outlet 6b are respectively arranged opposite to the motor 7 and the box body 1. Preferably, grilles are arranged in both the air inlet 6a and the air outlet 6b to play a role in protection and dust prevention. In actual products, the grille and the housing 6 are of an integral structure.

[0044] The motor 7, the box body 1, the cylinder 2, and the cylinder head 3 are all hidden in the housing 6, so that the whole machine head presents the shape of the housing 6, effectively enhancing the simplicity and beauty of the appearance of the machine head.

[0045] As Figure 2 , Figure 4 and Figure 5 shown, a strip-shaped concave cavity 6d is formed on the inner wall of the rear side of the box body 1, and the length of the strip-shaped concave cavity 6d extends in the front-back direction. The number of the strip-shaped concave cavities 6d is the same as that of the cylinders 2 and the positions correspond one by one. The front side and the bottom of the strip-shaped concave cavity 6d are both open. Each cylinder head 3 is respectively arranged in the corresponding strip-shaped concave cavity 6d, and an exhaust port 6e is arranged at the rear side of each strip-shaped concave cavity 6d. Preferably, the exhaust port 6e is strip-shaped and its length extends in the left-right direction; a row of the above-mentioned exhaust ports 6e is arranged at the rear side of each strip-shaped concave cavity 6d.

[0046] An axial flow fan blade 8 that makes the wind directly blow towards the cylinder 2 is arranged on the motor 7, and the wind is guided through the strip-shaped concave cavity 6d, greatly increasing the contact duration and area between the wind and the cylinder 2 and the end cover, thereby effectively accelerating the heat dissipation of the cylinder 2 and the cylinder head 3 and ensuring the service life and working stability of the machine head.

[0047] At the same time, the air inlet 6a and the air outlet 6b are respectively arranged opposite to the motor 7 and the box body 1, so that the wind can better contact the motor 7 and the box body 1 during the flowing process to accelerate the heat dissipation of the motor 7 and the box body 1, thereby further ensuring the service life and working stability of the machine head.

[0048] In this embodiment,

[0049] As Figure 2 and Figure 3As shown, the type of the motor 7 is an outer rotor motor, which is composed of a stator assembly 7a fixed on the box body 1 and a rotor assembly arranged outside the stator assembly 7a. Among them, the structure of the stator assembly 7a is prior art and will not be elaborated here. The rotor assembly consists of a cylindrical rotor frame 7b and a ring of permanent magnets arranged inside the rotor frame 7b. The above axial flow fan blade 8 is arranged outside the rotor frame 7b, and the front end of the crank 4 extends into the stator assembly 7a and is fixedly connected to the above rotor frame 7b. The use of an outer rotor motor for the motor 7 not only facilitates installation, but also the outer rotor motor itself is designed compactly, so as to effectively reduce the space it occupies, reduce the volume of the housing 6, and reduce the space occupied by the machine head.

[0050] At the same time, the front end of the crank 4 directly extends into the stator assembly 7a and is fixedly connected to the rotor frame 7b, so that the front end of the crank 4 replaces the rotor shaft of the motor 7. That is, in this application, the crank 4 and the rotor shaft are the same component, so as to further shorten the distance between the motor 7 and the box body 1, make the structure of the machine head more compact, and reduce the space occupation.

[0051] The installation method of the axial flow fan blade 8 is as follows: The axial flow fan blade 8 includes an annular base body and a ring of blades 8a integrally formed on the outer wall of the base body, and the front end of the rotor frame 7b is the above base body. That is, in this application, the axial flow fan blade 8 and the rotor frame 7b are integral parts, which not only facilitates processing and assembly, but also is conducive to the stable rotation of the axial flow fan blade 8 and enhances the heat dissipation effect.

[0052] The connection method of the crank 4 and the rotor frame 7b is as follows: A bushing 9 coaxially arranged with the crank 4 is provided inside the stator assembly 7a. The rear end of the bushing 9 is sleeved and fixed on the front end of the crank 4, and the front end of the bushing 9 is fixedly connected to the rotor frame 7b. The crank 4 is fixedly connected to the rotor frame 7b by means of the bushing 9, which is convenient for the design and processing of the rotor frame 7b. Preferably, the front end of the bushing 9 is fixedly connected to the rotor frame 7b through a flange. Further explanation, the outer wall of the front end of the crank 4 and the inner wall of the rear end of the bushing 9 are in close contact and cooperation through a conical surface, so as to effectively enhance the coaxiality of the connection between the crank 4 and the bushing 9 and improve the operation stability and accuracy of the machine head. In actual products, the bushing 9 and the crank 4 are fixedly connected by bolts.

[0053] As Figure 3 and Figure 4 shown, the machine head further includes an exhaust pipe 10. The exhaust pipe 10 is located inside the housing 6, and the air outlet holes of each cylinder head 3 communicate with the inner hole of the exhaust pipe 10. One end of the exhaust pipe 10 extends out of the housing 6 to facilitate the connection of the machine head to the air storage tank. Among them, the connection method between the air outlet hole of the cylinder head 3 and the exhaust pipe 10 is prior art and will not be elaborated here. Further explanation, the air outlet hole and the air inlet hole of the cylinder head 3 are arranged forward and backward respectively, and the exhaust pipe 10 is arranged between the cylinder 2 and the axial flow fan blade 8. The exhaust pipe 10 is arranged between the cylinder 2 and the axial flow fan blade 8, which can reduce the temperature of the compressed air in the exhaust pipe 10; the air inlet hole of the cylinder head 3 is arranged backward, which can reduce the temperature of the gas entering the cylinder head 3 and reduce the heat generated during the operation of the cylinder 2.

[0054] In the actual product,

[0055] As Figure 4 shown, an oil hole also horizontally penetrates through the lower side wall of the box body 1, and the oil hole is arranged close to the bottom wall of the box body 1. A fuel pipe 11 is horizontally fixed inside the outer shell 6, the inner end of the fuel pipe 11 communicates with the oil hole, the outer end of the fuel pipe 11 extends out of the outer shell 6, and a plugging member 12 that closes the outer end port of the fuel pipe 11 is detachably fixed on the outer end of the fuel pipe 11. Under the action of the fuel pipe 11, the oil hole extends to the outside of the outer shell 6, facilitating oil discharge. In this embodiment, the inner end of the fuel pipe 11 is screwed into the oil hole; the plugging member 12 is a cock screwed into the outer end of the fuel pipe 11.

[0056] As Figure 2 , Figure 5 and Figure 6 shown, a through hole horizontally penetrates through the lower side wall of the box body 1, an oil sight glass 13 is installed in the through hole, and an observation port 6c that is arranged opposite to the oil sight glass 13 horizontally penetrates through the side wall of the outer shell 6, so that an operator can check the oil level in the box body 1 through the observation port 6c outside the outer shell 6, facilitating use. In the actual product, the oil sight glass 13 is screwed into the through hole.

[0057] Furthermore, to prevent the machine head from dry burning, as Figure 3 , Figure 6 and Figure 7 shown, an installation hole also penetrates through the lower side wall of the box body 1, a liquid level sensor 14 is arranged outside the box body 1, the liquid level sensor 14 is an existing product, and preferably the liquid level sensor 14 adopts a photoelectric liquid level sensor 14. The liquid level sensor 14 includes a rod-shaped main body 14a, one end of the main body 14a is a detection end 14a1, the detection end 14a1 passes through the installation hole and is inside the box body 1, and the position of the detection end 14a1 is lower than the center point position of the through hole, and the main body 14a is hermetically fixedly connected to the box body 1. By arranging the liquid level sensor 14 and the position of the detection end 14a1 being lower than the center point position of the through hole, when in actual use, the liquid level sensor 14 is connected to a controller to actively remind the user that the oil in the box body 1 is lacking, avoiding dry burning of the machine head due to negligence and effectively ensuring the service life of the machine head.

[0058] Among them,

[0059] The installation method of the main body 14a is as follows: The type of the installation hole is a threaded hole, and the main body 14a is screwed into the installation hole, effectively facilitating the installation of the liquid level sensor 14. Furthermore, an annular limiting seat 14a2 is formed on the outer wall of the main body 14a, the limiting seat 14a2 and the main body 14a are coaxially arranged, and the limiting seat 14a2 abuts against the outer wall of the box body 1, enabling the main body 14a to be screwed in place at one time, further facilitating assembly.

[0060] Preferably, the installation hole is arranged obliquely downward, which is beneficial to processing.

[0061] The main body 14a and the box body 1 are sealed as follows: an annular groove coaxial with the end face of the limit seat 14a2 is provided on the end face of the limit seat 14a2, an annular gasket 15 is arranged in the annular groove, and both end faces of the gasket 15 are tightly pressed against the bottom wall of the annular groove and the edge of the mounting hole. Under the action of the gasket 15, the sealing performance formed between the main body 14a and the box body 1 is effectively enhanced.

[0062] In the actual product, the machine head further includes a circuit board 16, and the circuit board 16 is located inside the housing 6 and is vertically arranged between the air inlet 6a and the motor 7. A chip is installed on the circuit board 16, and the chip can control the input voltage and the input current. Embodiment 2

[0063] The structure and principle of this Embodiment 2 are basically the same as those of Embodiment 1. The difference lies in that: an annular positioning groove is provided on the outer side wall of the main body 14a, an O-ring is arranged in the positioning groove, and the outer peripheral surface of the O-ring is pressed against the hole wall of the mounting hole.

[0064] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. An oil-fired air compressor head, comprising a housing (1) and at least two cylinders (2) uniformly distributed outside the housing (1) in the circumferential direction, each cylinder (2) being provided with a cylinder head (3), a crank (4) being horizontally provided inside the housing (1), the crank (4) driving the cylinders (2) to operate via connecting rods (5), the connecting rods (5) being the same in number as the cylinders (2) and corresponding in position, the front end of the crank (4) extending out of the housing (1), characterized in that: The machine head further comprises a housing (6) and a motor (7), wherein the motor (7) and the housing (1) are both arranged in the housing (6), and the motor (7) and the housing (1) are arranged in a front-to-rear direction along the axis of the crank (4); the motor (7) is used to drive the crank (4) to rotate, and an axial flow fan blade (8) driven to rotate by the motor (7) is also arranged on the motor (7), and the cylinder (2) is arranged opposite to the axial flow fan blade (8) so that the wind energy generated by the axial flow fan blade (8) is directly blown toward the cylinder (2); The front and rear sides of the outer shell (6) are respectively provided with an air inlet (6a) and an air outlet (6b); a strip-shaped concave cavity (6d) is formed on the inner wall of the rear side of the box body (1); the length of the strip-shaped concave cavity (6d) extends forward and backward; the number of the strip-shaped concave cavities (6d) is the same as that of the cylinder (2); the front side and the bottom of the strip-shaped concave cavity (6d) are both open; each cylinder cover (3) is respectively arranged in a corresponding strip-shaped concave cavity (6d); and an exhaust port (6e) is provided on the rear side of the strip-shaped concave cavity (6d).

2. The oil-filled air compressor head according to claim 1, characterized in that: The air inlet (6a) and the air outlet (6b) are arranged facing the motor (7) and the box body (1) respectively.

3. The oil-filled air compressor head according to claim 1 or 2, characterized in that: The motor (7) is an external rotor motor, which is composed of a stator assembly (7a) fixed on a housing (1) and a rotor assembly arranged outside the stator assembly (7a), the rotor assembly being composed of a cylindrical rotor frame (7b) and a circle of magnetic steel arranged inside the rotor frame (7b), the axial flow fan blade (8) being arranged outside the rotor frame (7b), and the front end of the crank (4) extending into the stator assembly (7a) and being fixedly connected to the rotor frame (7b).

4. The oil-filled air compressor head according to claim 3, characterized in that: The axial flow fan blade (8) comprises an annular base and a circle of blades (8a) integrally formed on the outer wall of the base, and the front end of the rotor frame (7b) is the above-mentioned base.

5. The oil-filled air compressor head according to claim 1, characterized in that: A through hole is horizontally penetrated on the side wall at the lower end of the box body (1), an oil mirror (13) is installed in the through hole, and an observation port (6c) is horizontally penetrated on the side wall of the outer shell (6) and is arranged opposite to the oil mirror (13).

6. The oil-filled air compressor head according to claim 5, characterized in that: A mounting hole is also provided through the side wall at the lower end of the box body (1). A liquid level sensor (14) is provided outside the box body (1). The liquid level sensor (14) comprises a rod-shaped main body (14a). One end of the main body (14a) is a detection end (14a1). The detection end (14a1) passes through the mounting hole and is located inside the box body (1). The position of the detection end (14a1) is lower than the center point of the through hole. The main body (14a) is sealed and fixedly connected to the box body (1).

7. The oil-filled air compressor head according to claim 6, characterized in that: The mounting hole is a threaded hole, and the main body (14a) is screwed into the mounting hole.

8. The oil-filled air compressor head according to claim 6 or 7, characterized in that: The mounting holes are arranged obliquely downward.

9. The oil-filled air compressor head according to claim 1, characterized in that: An oil hole is also provided on the side wall at the lower end of the box body (1), and the oil hole is arranged close to the bottom wall of the box body (1); an oil pipe (11) is horizontally fixed in the outer shell (6), the inner end of the oil pipe (11) is connected to the oil hole, the outer end of the oil pipe (11) extends out of the outer shell (6), and a plugging member (12) for closing the outer end port of the oil pipe (11) is detachably fixed on the outer end of the oil pipe (11).

10. The oil-filled air compressor head according to claim 1, characterized in that: The machine head also comprises a circuit board (16), which is located in the housing (6) and vertically arranged between the air inlet (6a) and the motor (7).

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