JP2001082339A - Air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembling work efficiency of a pair of cylinder heads. SOLUTION: An air compressor 10 is provided with cylinder heads 52 and 54. The cylinder head 52 comprises a first line 53 communicating with a first intake chamber 52a; and a first hole 55 communicating with a first discharge chamber 52b. The other cylinder head 54 comprises a second line 57 communicating with a second discharge chamber 54b; and a second hole 59 communicating with the second intake chamber 54a and a second hole 59 communicating with a second intake chamber 54b. The first line 53 is inserted in the second hole 59 and the second line 57 is inserted in the first hole 55. This constitution performs intercommunication between the first and second intake chambers 52a and 54a through the first line 53 and the second hole 59 and between the first and second discharge chambers 52b and 54b through the second line 57 and the first hole 55 and improves the working efficiency of an assembly work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air compressor,
In particular, the present invention relates to an air compressor configured to drive a pair of air compressors with one motor.

[0002]

2. Description of the Related Art Generally, an air compressor has an air compressor for generating compressed air and a drive motor for driving a drive shaft of the air compressor. In the air compression section, the piston reciprocates due to the rotational driving force of the drive motor. The air is sucked and compressed by the reciprocation of the piston, and the compressed air is discharged.

There is also a two-cylinder air compressor in which a pair of air compressors are driven by one motor in order to reduce the size of the air compressor and stably supply compressed air.
Since this type of air compressor is installed inside the housing of a device that uses compressed air, such as a medical machine, it is required that the intake path and the discharge path have compact configurations.

Further, the piston, the cylinder, the cylinder head, the intake valve, the discharge valve and the like are shared by the pair of air compressors, and have the same configuration. And
The intake chamber and the discharge chamber of the pair of air compressors communicate with each other by pipes serving as an intake path and a discharge path, respectively.

[0005]

However, in the above-mentioned air compressor, since a pair of air compressors is connected by two pipes, two pipes separate from the air compressor are prepared. In addition to this, a seal member (four O-rings) for sealing the end of each pipe inserted into the hole provided in the air compressor must be installed.

Conventionally, two pipes are used to communicate between the intake chamber and the discharge chamber of the pair of air compressors, which increases the number of parts and the number of assembly steps. It was difficult to increase production efficiency. Therefore, an object of the present invention is to provide an air compressor that solves the above problems.

[0007]

In order to solve the above problems, the present invention has the following features. The present invention provides a pair of air compressors that generate compressed air, a drive motor that drives a drive shaft of the pair of air compressors, and first and second air compressors provided on top of each of the pair of air compressors. A second cylinder head, first and second intake chambers formed inside each of the first and second cylinder heads, and a second cylinder head formed inside each of the first and second cylinder heads. An air compressor having first and second discharge chambers for discharging compressed air generated by an air compression unit to the outside, wherein the air compressor is provided integrally with the first cylinder head and communicates with the first intake chamber. A first pipe line, a first hole provided in the first cylinder head and communicating with the first discharge chamber, and a first hole provided integrally with the second cylinder head in the second discharge chamber. A second conduit communicating with the second cylinder head; A second hole communicating with a second intake chamber, wherein the first conduit is inserted into the second hole and the second conduit is inserted into the first hole. It is characterized by the following.

Therefore, according to the present invention, the first and second cylinder heads communicate with each other via the pipe line provided integrally with the cylinder head, so that the number of parts can be reduced and the assembling work can be reduced. The number of steps can be reduced, and the production efficiency can be increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of the air compressor according to the present invention. FIG. 2 is a plan view showing a cross section of a part of the cylinder head of the air compressor shown in FIG. FIG. 3 is a front view of the air compressor. FIG. 4 is a plan view of the air compressor. FIG. 5 is a side view of the air compressor.

As shown in FIGS. 1 to 5, the air compressor 10 is a reciprocating compressor in which two cylinders including piston and cylinder mechanisms 12, 14 are driven by one drive motor 16. Piston-cylinder mechanism 1 as air compressor
The reference numerals 2 and 14 are disposed on both left and right sides of the drive motor 16 and are provided coaxially. The drive motor 16 generally includes a housing 18, a stator 20, and a motor shaft 22.
And a rotor 24. Housing 18
The motor shaft 2 is provided on the wall portions 18a and 18b arranged on both sides of the motor shaft 2.
Bearings 26 and 28 for rotatably supporting the bearing 2 are provided. The motor shaft 22 is coupled to the rotor 24 between the bearings 26 and 28, and is rotationally driven together with the rotor 24 when an electromagnetic torque is generated between the stator 20 having a coil and the rotor 24 made of a magnet. .

Also, both ends 22a, 22a of the motor shaft 22 are provided.
b extends through the bearings 26 and 28 in the left-right direction. And both ends 22a and 22b of the motor shaft 22 are
Crankshaft 3 of piston / cylinder mechanism 12, 14 respectively
0 and 32 are connected in an eccentric position and penetrated. Further, crank arms 34 and 36 are integrally formed on side surfaces of the crankshafts 30 and 32.

Further, on the outer periphery of the crankshafts 30 and 32,
The bearings 38 and 40 are fitted, and the large ends 42 a and 44 a of the connecting rods 42 and 44 are fitted around the bearings 38 and 40. Then, the small ends 42b of the connecting rods 42, 44,
44b is formed integrally with the pistons 45 and 46. Accordingly, the pistons 45, 46 are connected to the crankshaft 30,
32, the large ends 42a, 4 of the connecting rods 42, 44
When 4a moves circularly, it reciprocates in cylinders 48 and 50 while swinging together with small ends 42b and 44b.

At the top of the cylinders 48 and 50, intake valves 48a and 50a which open during the suction stroke of the pistons 45 and 46 are provided.
And discharge valves 48b and 50b that open during the discharge stroke (compression stroke) of the pistons 45 and 46. Further, a cylinder head 5 is provided above the cylinders 48 and 50.
2, 54 are mounted. This cylinder head 52,
54 is cut into a predetermined shape by machining after being cast. The cylinder heads 52 and 54 are fixed to the upper portions of the cylinders 48 and 50 by tightening the mounting bolts 63 in a state where the cylinder heads 52 and 54 are connected to each other.

A pair of cylinder heads 52, 54
Have first and second intake chambers 52a and 54a therein, respectively.
First and second discharge chambers 52b and 54b for discharging compressed air generated by reciprocating pistons 45 and 46 to the outside.
And suction ports 56a, 56b communicating with the first and second suction chambers 52a, 54a, and the first and second discharge chambers 52b, 5
4b, and has discharge ports 58a and 58b communicating with each other.

Here, the configuration of the cylinder heads 52 and 54 will be described. Since the cylinder heads 52 and 54 have the same configuration, only one cylinder head 52 will be described. FIG. 6 is a plan view of the cylinder head 52. FIG. 7 is a bottom view of the cylinder head 52. FIG. 8 is a longitudinal sectional view taken along line AA in FIG. FIG. 9 is a longitudinal sectional view taken along line BB in FIG.

As shown in FIGS. 6 to 9, the cylinder head 52 is provided integrally with a first conduit 53 communicating with a first intake chamber 52a. Further, the cylinder head 52 has a first hole 5 communicating with the first discharge chamber 52b.
5 are provided. The first suction chamber 52a and the first discharge chamber 52b of the cylinder head 52 are defined by a partition wall 52c, and open to the bottom side. Further, an outer peripheral wall 52 surrounding the first intake chamber 52a and the first discharge chamber 52b.
A bolt insertion hole 52e into which the mounting bolt 63 is inserted penetrates vertically around d.

The discharge port 58a and the passage 53a of the first conduit 53 are arranged coaxially and communicate with each other via a first intake chamber 52a. The intake port 56a and the first hole 55 are coaxially arranged and communicate with each other via the first discharge chamber 52b. Similarly to the cylinder head 52, the other cylinder head 54 is provided integrally with a second pipe 57 that is communicated with the second discharge chamber 54b. Further, the cylinder head 54 is
A second hole 59 communicating with the suction chamber 54a is provided. The cylinder head 54 has a second intake chamber 54a and a second discharge chamber 54b.

The first and second conduits 53 and 57 are formed in a cylindrical shape having communication passages 53a and 57a therein, and the first and second intake chambers 52 are formed through the communication passages 53a and 57a.
a and 54a, and between the first and second discharge chambers 52b and 54b. O-ring grooves 5 for mounting an O-ring (seal member) 61 are provided on the outer periphery of the distal ends of the conduits 53 and 57.
3b and 57b are provided.

A pair of cylinder heads 52, 54
Is attached to the upper ends of the cylinders 48 and 50, the first conduit 53 is inserted into the second hole 59, and the second conduit 57 is inserted into the first hole 55. Thereby, the cylinder heads 52 and 54 are mutually connected. At the same time, the first, second
The first and second discharge chambers 5a and 54a communicate with each other through a first conduit 53 and a second hole 59.
2b and 54b are communicated via a second conduit 57 and a first hole 55.

Thus, the first and second conduits 53, 57
Are formed integrally with the cylinder heads 52 and 54, the number of parts can be reduced by that much, and the number of steps in the assembling process can be reduced, thereby increasing the production efficiency. Further, since only two O-rings 61 are mounted on the distal ends of the conduits 53 and 57, the mounting time of the O-rings 61 is also reduced.

The first conduit 53 of the cylinder head 52
Is slidably inserted into a second hole 59 of the cylinder head 54 and a second conduit 57 of the cylinder head 54.
Is slidably inserted into the first hole 55 of the cylinder head 52. Therefore, for example, drive motors 16 having different outputs
When the piston / cylinder mechanisms 12 and 14 are attached to both sides of the cylinder head 5, the insertion positions of the conduits 53 and 57 and the holes 55 and 59 are changed according to the total length of the motor shaft 22.
The separation between 2 and 54 can be adjusted.

For this reason, it is possible to select a drive motor 16 having a different output from that of the type in which the separation distance between the cylinder heads 52 and 54 is fixed by the length of the pipe to be connected. Regardless of the size of the motor 16, the cylinder heads 52, 54 can be used as common parts. Thereby, the production efficiency of the air compressor 10 can be improved.

Either the inlet port 56 or the outlet port 58 provided on the side of the cylinder heads 52 and 54 is opened, and the other is closed by a cap. still,
Regarding the intake port 56 and the discharge port 58, the intake port 56 and the discharge port 58 at arbitrary positions are selectively opened according to the usage of the user. In addition, an air inlet 5 used for sucking air.
A silencer (not shown) for reducing intake noise is connected to 6.

Further, a blower fan 64 for introducing outside air as a cooling airflow is provided at both ends 22a and 22b of the motor shaft 22 which penetrates the crank arms 34 and 36.
66 are fitted and fixed. Further, fan covers 68 and 70 that cover the blowing fans 64 and 66 are attached to both left and right sides of the housing 18. As shown in FIGS. 1 and 5, the fan covers 68 and 70 are engaged with flat portions 68 a and 70 a formed in the vertical direction so as to face the blowing fans 64 and 66, and are locked on the front side of the housing 18. Front locking portions 68b and 70b, and rear locking portions 68c and 70c locked on the rear surface side of the housing 18.

The fan covers 68 and 70 are integrally provided with protrusions 72 and 74 functioning as deformation preventing members at the center of the inner surfaces of the flat portions 68a and 70a. As shown in FIG. 1, the protrusions 72 and 74
2 protrudes so as to be close to the end surfaces of both end portions 22a and 22b, and is normally in a position where the end portions 22a and 22b of the motor shaft 22 are not in contact with each other. Therefore, between the protruding parts 72 and 74 and the end faces of both ends 22 a and 22 b of the motor shaft 22,
They face each other at a position close to each other with a small gap therebetween.

Therefore, when an external force acts on the fan covers 68 and 70, the flat portions 68 of the fan covers 68 and 70
The central portions of the flat portions 68a, 70a are immediately deformed inward, but immediately the protruding portions 72,
74 contacts the end faces of both ends 22a and 22b of the motor shaft 22. This prevents deformation of the central portions of the flat portions 68a, 70a of the fan covers 68, 70.

As described above, the flat portions 68a, 70a of the fan covers 68, 70 have the protrusions 72, 74 formed by the motor shaft 2
By contacting the end surfaces of both end portions 22a and 22b of the second member 2, the member is supported from the inside and the strength against external force is secured. As a result, the amount of deformation due to external force is suppressed to a very small value, and damage to the flat portions 68a and 70a is prevented. The first ribs 76 extending in the horizontal direction and extending in a direction inclined at an angle of 60 ° with respect to the extending direction of the first ribs 76 are provided on the flat portions 68a and 70a of the fan covers 68 and 70. A second rib 78 and a third rib 80 extending in a direction inclined at an angle of 60 ° with respect to the extending direction of the first rib 76 and the second rib 78 are provided.

Therefore, a plurality of ribs 76, 78, 8
Since the pieces 0 are integrally formed in a state where they are firmly connected to each other, the strength of the fan covers 68 and 70 themselves is increased. Further, a first intake hole 82 extends between the first ribs 76 and a second intake hole 84 extends between the second ribs 78.
Are formed so as to extend between the third ribs 80 and the third intake holes 8.
6 are formed to extend.

As described above, since the intake holes 82, 84, 86 are formed so as to extend in the inclined direction shifted by an angle of 60 °, they are provided along the rotation direction of the blower fans 64, 66. . Therefore, each rib 76, 78, 80
The angles in the respective extending directions are shifted so as to reduce the resistance to the swirling flow of the intake air accompanying the rotation of the blowing fans 64 and 66. That is, the plurality of intake holes 82, 84, 86 formed in the fan covers 68, 70 correspond to the blowing fans 64,
Since it has a predetermined inclination angle with respect to the direction orthogonal to the swirling flow of air accompanying the rotation of 66, the air suction resistance is reduced.

Therefore, the intake resistance of the air flow accompanying the rotation of the blowing fans 64 and 66 is reduced, and the amount of air to be sucked is increased by that amount, so that the cooling effect can be further enhanced.
The small holes 6 for screwing are formed in the flat portions 68a and 70a.
8d and 70d (see FIG. 5) are provided, and the front locking portion 68 is provided.
B, 70b and rear locking portions 68c, 70c have locking pins 88 projecting from the front and rear surfaces of the housing 18 (see FIG. 3).
Are provided with locking grooves 68e and 70e which are engaged with and locked to. Therefore, the fan covers 68 and 70 are
It can be easily mounted by screwing the small holes 68d, 70d of the a, 70a.

In the above-described embodiment, the air compression section including the piston / cylinder mechanisms 12, 14 has been described as an example. However, the present invention is not limited to this, and is applicable to an air compressor having another type of air compression section. Of course you can. In addition, the arrangement of the first conduit 53, the second conduit 57, the first hole 55, and the second hole 59 provided in the cylinder heads 52 and 54 of the above-described embodiment is in the above-described positional relationship. However, the arrangement of the first conduit 53 and the first hole 55 and the arrangement of the second conduit 57 and the second hole 59 may be reversed. In this case, the position of the first conduit 53 shown in FIG. 6 is as shown in FIG. 7, and the first conduit 53 shown in FIG.
Is reversed.

[0032]

As described above, according to the present invention, since the first and second cylinder heads are communicated with each other through a pipe provided integrally with the cylinder head, a pipe is prepared as in the prior art. Therefore, the number of parts is reduced, and the number of steps of the assembling work is reduced, so that the production efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an embodiment of an air compressor according to the present invention.

FIG. 2 is a plan view showing a cross section of a part of a cylinder head of the air compressor shown in FIG.

FIG. 3 is a front view of the air compressor.

FIG. 4 is a plan view of the air compressor.

FIG. 5 is a side view of the air compressor.

FIG. 6 is a plan view of the cylinder head 52.

FIG. 7 is a bottom view of the cylinder head 52.

8 is a longitudinal sectional view taken along line AA in FIG.

FIG. 9 is a longitudinal sectional view taken along line BB in FIG. 7;

[Explanation of symbols]

 Reference Signs List 10 air compressor 12, 14 piston / cylinder mechanism 16 drive motor 18 housing 22 motor shaft 26, 28 bearing 30, 32 crankshaft 45, 46 piston 48, 50 cylinder 52, 54 cylinder head 52a first intake chamber 52b first Discharge chamber 53 first pipe 54a second suction chamber 54b second discharge chamber 55 first hole 56a, 56b suction port 57 second pipe 58a, 58b discharge port 59 second hole

Claims (1)

[Claims] 1. A pair of air compressors for generating compressed air, a drive motor for driving a drive shaft of the pair of air compressors, and a first motor provided on an upper part of each of the pair of air compressors. A second cylinder head; first and second intake chambers formed inside each of the first and second cylinder heads; and a second cylinder head formed inside each of the first and second cylinder heads An air compressor having first and second discharge chambers for discharging compressed air generated by the air compression section to the outside, wherein the first air intake chamber is provided integrally with the first cylinder head. A first pipe communicating with the first cylinder, a first hole provided in the first cylinder head and communicating with the first discharge chamber, and a second discharge chamber integrally provided in the second cylinder head. A second conduit communicating with the second cylinder head; And a second hole communicating with the second intake chamber. The first line is inserted into the second hole, and the second line is inserted into the first hole. An air compressor characterized by being made to work.