JPS6332942Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an air compressor, particularly an air compressor used to obtain compressed air for use in automobiles.

(Prior Art) An air compressor is equipped with an intake valve, a discharge valve, and a piston that slides inside a cylinder, and performs compression by reciprocating motion of the piston. can be mentioned.
In this example, the air compressor consists of a plate having a circular hole and a corresponding disc-shaped valve body.

(Problems to be Solved by the Invention) The relationship between rotational speed and suction efficiency is such that as the rotational speed increases, suction efficiency decreases, as shown by the solid line in FIG. This is mainly caused by backflow from the intake valve during the compression process in the high rotation range.

Therefore, in order to prevent backflow, it is preferable that the lift amount of the valve body is small, but since the suction efficiency is determined by the product of the opening area and the lift amount, in order to improve efficiency, the lift amount should be larger. good.

In the above examples, the suction valve and the discharge valve are arranged side by side on a valve plate provided on the cylinder, so there is a limit to the diameter of the circle. Therefore, it is not possible to increase the opening area with a circular shape.

Therefore, the purpose of this invention is to improve suction efficiency, particularly to prevent a drop in efficiency in the high rotation range.

(Means for Solving the Problems) The gist of this invention is that in an air compressor that is equipped with an intake valve, a discharge valve, and a piston that slides inside the cylinder, and performs a compression action by the reciprocating motion of the piston, the suction valve A plate is provided in the suction passage and serves as a valve seat having a rectangular hole, a rectangular valve body having a shape corresponding to the hole formed in the plate, and a spring that biases the valve body against the plate. It consists of more than one thing.

(Function) Therefore, since the suction valve is composed of a plate having a rectangular hole and a rectangular valve body corresponding to the hole, the opening area is increased, and as a result, the lift amount is reduced. This prevents a drop in efficiency in the high rotation range and provides flat characteristics.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIGS. 1 to 4, the cylinder head 1
is provided at the open end of the cylinder block 2 with a valve plate 3 interposed therebetween. This cylinder head 1 is provided with a suction port 4 and a discharge port 5, and a suction passage 7 connected to the suction port 4 through a partition wall 6.
and a discharge passage 8 connected to the discharge port 5.

The suction passage 7 is provided with a suction valve 9, and the suction valve 9 includes a rectangular plate 9a having a rectangular hole 9b in the center, a rectangular valve body 9c, and the valve body 9.
As shown in FIG. 3, the plate 9a has a rectangular hole 9b in the center and mounting bolt holes 9e, 9e at both ends. bolt 1
It is fixed to the cylinder head 1 at 1 and 11. Further, as shown in FIG. 4, the valve body 9c has a rectangular shape corresponding to the hole 9b of the plate 9a described above, and one end is connected to the valve body 9c, and the other end is connected to the valve plate 9c.
It is urged by a coiled spring 9d that is in contact with the plate 9a and is seated on the plate 9a. Therefore, the valve body 9c of the suction valve 9 opens against the spring 9d due to the pressure difference when the piston 21 descends and the compression chamber 22 of the cylinder becomes negative pressure.

Further, the suction passage 7 is provided with an unloading device 12 that forcibly opens the suction valve 9, and when compressed air is supplied from the unloading operation pressure connection port 13, the unloading device 12 An unload piston 14 that is displaced by air, a spring 15 that presses the unload piston 14,
It consists of a push rod 16 connected to an unload piston 14.

A cooling block 18 having holes 17 is disposed within the discharge passage 8, and a cooling water passage 19 is formed. Although not shown, cooling water is flowed into the cooling water passage 19 from the outside. Further, the discharge valve 20 is
It is composed of a reed-type valve body 20a and a retainer 20b.

In the air compressor, the piston 21 is moved up and down by the drive of the engine, and as the volume of the compression chamber 22 expands during its downward stroke, air flows from the intake port 4 through the intake passage 7 to the intake valve. 9 is opened and suction is drawn into the compression chamber 22 of the cylinder. During the upward stroke of the piston, air is compressed because the volume within the compression chamber 22 is reduced, and the discharge valve 20 is opened and the air is supplied from the discharge port 5 to a tank connected to an external device.

The suction valve 9 has a hole 9b formed in its plate 9a.
If the transverse dimension is the same as the conventional example, and the longitudinal dimension is increased by about 2.2 times than the conventional example, making it a rectangle as shown in Figure 3, the opening area will be about 3.2 times larger. , the inhalation efficiency can be increased by almost three times. As a result, the amount of lift of the suction valve 9 can be reduced, and due to the reduction in the amount of lift, the amount of backflow from the suction valve can be reduced. For this reason, the characteristic diagram of the rotational speed and suction efficiency according to this invention, as shown by the dotted line in FIG. 5, eliminates the drop in efficiency in the high rotational range and can provide almost flat characteristics.

(Effects of the invention) As described above, according to this invention, by making the hole formed in the plate of the suction valve rectangular, the opening area is expanded, and as a result, the amount of lift of the valve body of the suction valve is reduced. This makes it possible to reduce the amount of backflow from the suction valve. For this reason, it is possible to obtain characteristics of suction efficiency at high rotation speeds.

Further, the formation of rectangular holes has the advantage that it can be applied to conventional air compressors simply by changing the plate, and is extremely easy to apply.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of this invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a plan view of the plate of the suction valve, and Fig. 4 is a plan view of the valve body of the suction valve. 5 are characteristic diagrams showing the characteristics of this invention and the conventional example. 7... Suction passage, 9... Suction valve, 9a... Plate, 9b... Hole, 9c... Valve body, 9d... Spring, 20... Discharge valve, 21... Piston.

Claims (1)

[Scope of utility model registration request] In an air compressor that is equipped with a suction valve, a discharge valve, and a piston that slides inside the cylinder, and performs a compression action by the reciprocating motion of the piston, the suction valve is provided in the suction passage, and has a valve seat with a rectangular hole. An air compressor comprising: a rectangular valve body having a shape corresponding to a hole formed in the plate; and a spring that presses the valve body against the plate.