JP2010106789A - Air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a passage area of an inlet and rigidity of a valve plate. <P>SOLUTION: An air compressor is equipped with a cylinder chamber, a piston fit in the cylinder chamber and reciprocated in an engine, the valve plate 16 blocking off the cylinder chamber, the inlet 20 opened in the valve plate 16 and communicated with the cylinder chamber, an inlet valve 25 opening and closing the inlet 20, an outlet port opened in the valve plate 16 and communicated with the cylinder chamber, and a delivery valve 18 opening and closing the outlet port. The inlet 20 is composed by concentrically disposing three elliptical hole shaped intake holes 21A, 21B, 21C, a lead valve 26 of the inlet valve 25 is composed to concurrently opening and close the three intake holes by a free end outermost part, ribs 24, 24 are interposed between the intake holes 21A and 21B, and intake holes 21A and 21C, and thickness T24 of the ribs 24, 24 are provided thinner than thickness T21 of peripheries of the three intake holes 21A, 21B, 21C. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an air compressor.
For example, the present invention relates to an effective device for use in an air brake device of a vehicle such as an automobile.

  As an air compressor used in an air brake device of a vehicle such as an automobile, a cylinder chamber formed in a cylinder body, a piston that is slidably reciprocated in the cylinder chamber and reciprocated by a driving device, and a cylinder chamber A valve plate that is closed, a suction port that is opened in the valve plate and communicates with the cylinder chamber, a suction valve that opens and closes the suction port, a discharge port that is established in the valve plate and communicates with the cylinder chamber, and opens and closes the discharge port And a discharge valve.

In such an air compressor, the suction port is constituted by a perfect circular hole, and the suction valve is configured such that a lead type valve body (hereinafter referred to as a reed valve) is seated in a direction perpendicular to the valve seat. Thus, the suction port is configured to open and close. The reed valve as an intake valve is configured by a thin plate of about 0.3 to 0.5 mm, and only one end is fixed and the other end is configured as a free end. The valve opening and closing operation can be repeated at high speed. For example, see Patent Document 1.
JP-A-8-28450

However, in such an air compressor, since the suction port is configured by a true circular hole, the air (air) passage area is limited, which causes the following adverse effects. is there.
(1) When the passage area of the suction port is small, the pressure difference between the atmospheric pressure and the cylinder chamber increases, so that oil rises (a phenomenon in which lubricating oil in the cylinder chamber is mixed with air).
(2) When the air stays in the suction chamber connected to the suction port, the heat of the automobile radiator water that circulates in the air compressor for cooling increases the temperature of the air discharged from the discharge port through the air Let
(3) If the diameter of the true circular hole is designed to be large, the rigidity of the valve plate is lowered, and the gasket or the like is damaged.

  An object of the present invention is to provide an air compressor capable of increasing the passage area of the suction port and the rigidity of the valve plate.

Typical means for solving the above-described problems are as follows.
(1) A cylinder chamber formed in the cylinder body, a piston reciprocally fitted in the cylinder chamber and reciprocated by a driving device, a valve plate closing the cylinder chamber, and opening in the valve plate A suction port that communicates with the cylinder chamber, a suction valve that opens and closes the suction port, a discharge port that is opened in the valve plate and communicates with the cylinder chamber, and a discharge valve that opens and closes the discharge port. In the air compressor provided,
The suction port has a plurality of elongated holes, and the plurality of suction holes are arranged at the periphery of the valve plate and inside the outer edge of the suction valve. The air compressor is characterized in that a thickness around the suction hole is formed thinner than a thickness of the valve plate, and a rib is provided between the plurality of suction holes.
(2) The suction valve includes a valve body formed of a thin plate, and the valve body is configured so that one end is fixed and the plurality of suction holes are opened and closed at a free end. The air compressor according to (1), which is characterized.
(3) The air compressor according to (2), wherein the valve body is configured to face the plurality of suction holes on the outermost side of a free end portion.
(4) The air compressor according to (1), (2), or (3), wherein the suction hole is disposed concentrically with a center of the cylinder chamber.

  According to the above-described means, the passage area of the suction port and the valve plate rigidity can be increased.

  In the present embodiment, the air compressor according to the present invention is configured to supply compressed air to an air brake device as shown in FIG.

  As shown in FIG. 1, an air brake device 1 includes an engine 2 for driving a vehicle, an air cleaner 3 for supplying clean air to the engine 2, and a cooling water system 4 for cooling the engine 2. A brake actuator 5, a reservoir 6 for supplying air to the brake actuator 5, a check valve 7 and an air dryer 8 interposed between the reservoir 6 and the air compressor 11, And a pressure regulator 9 for controlling the internal pressure.

  The air compressor 11 according to the present embodiment is configured to reciprocate and includes a cylinder body 12. A cylinder chamber 13 is formed in the main body 12, and a piston 14 is fitted in the cylinder chamber 13 so as to be slidable back and forth. The piston 14 is configured to be reciprocated linearly driven by the engine 2. Therefore, the engine 2 substantially constitutes a drive device for driving the air compressor 11.

  As shown in FIG. 2, a cylinder head 15 is fixed to one end (hereinafter referred to as an upper end side) of the cylinder chamber 13 with a valve plate 16 interposed therebetween. The valve plate 16 is provided with a discharge port 17 and a suction port 20 so as to communicate with the cylinder chamber 13, respectively, and is provided with a discharge valve 18 and a suction valve 25, respectively. That is, the valve plate 16 is configured to close one end of the cylinder chamber 13 and also serve as a valve plate (valve plate) for the discharge valve 18 and the suction valve 25.

The discharge port 17 is configured such that a pair of perfect circular holes are arranged close to each other in the front-rear direction at a position slightly closer to one side (hereinafter referred to as the left side) of the central portion of the valve plate 16. The discharge port 17 is connected to a discharge path 19 established in the cylinder head 15.
The discharge valve 18 includes a reed valve 18a whose one end is fixed and the other end is slidably supported, and a stopper 18b for regulating the position of the reed valve 18a on the opposite side of the valve plate 16 when the valve is opened. The reed valve 18a is disposed on the valve plate 16 in the cylinder head 15 so as to open and close a pair of true circular holes of the discharge port 17 simultaneously.
As shown in FIG. 1, the discharge passage 19 is connected to the reservoir 6 via the check valve 7 and the air dryer 8.

3 to 5, the suction port 20 includes three suction holes 21A, 21B, and 21C, and the three suction holes 21A, 21B, and 21C have an arc-shaped long hole shape. Are formed respectively. The three suction holes 21A, 21B, and 21C are arranged around the circumference of the valve plate 16 and inside the outer edge of the suction valve 25 and along the circumference formed by the cylinder chamber 13. That is, the three suction holes 21 </ b> A, 21 </ b> B, and 21 </ b> C are arranged in a line along an arc R centering on the axis O of the cylinder chamber 13.
On the cylinder chamber 13 side end surface of the valve plate 16 of the suction port 20, a seal groove 22 is provided so as to surround the opening edge portions of the three suction holes 21 </ b> A, 21 </ b> B, 21 </ b> C.

As shown in FIG. 3, the thickness T21 around the three suction holes 21A, 21B, and 21C is formed sufficiently thinner than the thickness T16 of the valve plate 16. That is, as shown in FIG. 3, the three suction holes 21 </ b> A, 21 </ b> B, and 21 </ b> C are formed in the bottom surface of the suction port forming hole 23 that is sunk in the cylinder head 15 side end surface of the valve plate 16. In other words, the thickness T21 around the three suction holes 21A, 21B, 21C is the difference between the thickness T16 of the valve plate 16 and the depth D of the suction port forming hole 23.
On the bottom surface of the suction port forming hole 23, a pair of ribs 24, 24 are formed between the central suction hole 21A and one suction hole 21B and between the central suction hole 21A and the other suction hole 21C, respectively. The thickness (height) T24 of the pair of ribs 24, 24 is set to be thinner than the thickness T21 around the three suction holes 21A, 21B, 21C.

As shown in FIGS. 2 and 3, the suction valve 25 is disposed on the cylinder chamber 13 side end surface of the valve plate 16. The intake valve 25 includes a reed valve 26 as a valve body, and the reed valve 26 is formed in a generally donut shape using a thin elastic plate material of about 0.3 to 0.5 mm. The reed valve 26 is arranged concentrically with and in contact with the lower surface of the valve plate 16 and is fixed to the valve plate 16 by a screw member 27 at one end, and at the free end that is the other end. The suction port 20, that is, the three suction holes 21A, 21B, and 21C are opened and closed simultaneously. The reed valve 26 faces the three suction holes 21A, 21B, 21C on the outermost side of the free end.
The pair of discharge ports 17 and 17 are disposed on the left side in the inner diameter of the donut shape of the reed valve 26.

  As shown in FIG. 2, a suction passage 28 formed in the cylinder head 15 is connected to the suction port 20, that is, the three suction holes 21 </ b> A, 21 </ b> B, and 21 </ b> C. The suction path 28 is connected to the air cleaner 3 via an engine intake pipe.

  As shown in FIGS. 1 and 2, a cooling water passage 30 through which cooling water circulates is formed in the cylinder head 15, and a cooling water system 4 for cooling the engine 2 is connected to the cooling water passage 30. Has been.

  Next, the operation will be described.

When the piston 14 is moved from the top dead center to the bottom dead center in the cylinder chamber 13, the reed valve 26 of the suction valve 25 is bent in the axial direction of the suction port 20 and is separated (lifted) from the valve plate 16. Thus, air is sucked into the cylinder chamber 13 through the suction passage 28 and the suction port 20, that is, the three suction holes 21A, 21B, and 21C.
In this case, in the present embodiment, the three suction holes 21A, 21B, and 21C in which the suction port 20 is formed in the shape of an oval hole are arranged concentrically so that the air passage area is large. Therefore, air can be efficiently sucked into the cylinder chamber 13.
Here, the air passage area of the suction port 20 is determined by the following equation (1).
A ≧ (La + Lb + Lc) × H (1)
In the formula (1), La, Lb, and Lc are the lengths of the major axes of the three suction holes 21A, 21B, and 21C, as shown in FIG. H is the lift amount of the suction valve 25, that is, the reed valve 26 at the point O 'in FIG. 5B, and the reed valve 26 has three suction holes 21A, 21B, 21C on the outermost concentric circle at the free end. It is configured to open and close at the same time.
That is, in the present embodiment, the three suction holes 21A, 21B, and 21C are formed in an oval hole shape and are arranged concentrically, so that compared with a conventional suction hole formed in a true circular hole shape. Thus, the air passage area can be increased.

In the reverse compression stroke, the suction valve 25 is closed by returning the reed valve 26 of the suction valve 25 to its original position.
Subsequently, when the internal pressure of the cylinder chamber 13 reaches a predetermined pressure, the discharge valve 18 is opened, so that high-pressure air is supplied to the reservoir 6 through the discharge port 17 and the discharge path 19.

  The air in the reservoir 6 is appropriately supplied to the brake operating device 5 when the brake is operated under the control of a brake valve (not shown), and this is operated.

  According to the embodiment, the following effects can be obtained.

(1) A plurality of oval-shaped suction holes are arranged concentrically on the suction port, and the plurality of suction holes are simultaneously opened and closed by the outermost end of the free end of the reed valve (suction valve). As a result, the air passage area can be increased as compared with the conventional suction hole formed in a perfect circular hole shape.

(2) By increasing the air passage area, the pressure difference between the atmospheric pressure and the cylinder chamber can be suppressed to be small, so that the occurrence of oil rising can be prevented.

(3) If the air passage area is small, the air is relatively stagnated in the suction path 28, so that the heat of the cooling water in the cooling water path 30 is transmitted through the air stagnated in the suction path 28 and the air in the discharge path 19 Although a phenomenon that raises the temperature occurs, if the air passage area is large, the air does not stagnate in the suction passage 28, so that the phenomenon that the cooling water in the cooling water passage 30 raises the air temperature in the discharge passage 19 may occur. Can be prevented.

(4) By providing a rib between the adjacent suction holes, it is possible to prevent the rigidity of the valve plate from being lowered, and thus it is possible to prevent the occurrence of adverse effects such as damage to the gasket.

(5) By arranging a plurality of suction holes concentrically near the outer peripheral edge of the valve plate, the suction valve can be reduced in size.

(6) By making the thickness around the plurality of suction holes thinner than the thickness of the entire valve plate, the weight of the entire air compressor can be reduced, and the flow resistance of the air can be reduced. Can do.

(7) A plurality of oblong hole-shaped suction holes are arranged concentrically on the suction port, and the plurality of suction holes are simultaneously opened and closed by the outermost free end of the reed valve (suction valve). Thus, the air passage area is the product of the sum of the major axes of the plurality of suction holes and the suction valve lift amount, so that the entire valve plate can be utilized and the shape of the valve plate can be optimized.

  In addition, this invention is not limited to the said embodiment, Of course, it can change variously in the range which does not deviate from the summary.

  The number of suction holes is not limited to three, and may be set to two or four or more.

  The arc R and the cylinder chamber are not necessarily concentric circles. That is, the plurality of suction holes need not be arranged concentrically with the center of the cylinder chamber.

  In the above-described embodiments, the air compressor used for the air brake device for automobiles has been described. However, the present invention is not limited to this, and can be applied to all air compressors such as an air compressor used for other purposes. .

It is a mimetic diagram showing an air brake device in which an air compressor which is one embodiment of the present invention was used. It is a partially omitted front sectional view showing an air compressor which is an embodiment of the present invention. The valve | bulb plate part is shown, (a) is front sectional drawing, (b) is a bottom view. The valve plate is shown, (a) is a top view, (b) is sectional drawing which follows the bb line of (a). The valve plate is shown, (a) is front sectional drawing, (b) is a bottom view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air brake device, 2 ... Engine (drive device), 3 ... Air cleaner, 4 ... Cooling water system, 5 ... Brake actuator, 6 ... Reservoir, 7 ... Check valve, 8 ... Air dryer, 9 ... Pressure regulator,
DESCRIPTION OF SYMBOLS 11 ... Air compressor, 12 ... Cylinder main body, 13 ... Cylinder chamber, 14 ... Piston, 15 ... Cylinder head, 16 ... Valve plate,
17 ... discharge port, 18 ... discharge valve, 19 ... discharge path,
20 ... Suction port, 21A, 21B, 21C ... Suction hole, 22 ... Seal groove, 23 ... Suction port forming hole, 24 ... Rib, 25 ... Suction valve, 26 ... Reed valve, 27 ... Screw member, 28 ... Suction passage, 30: Cooling water channel.

Claims (4)

A cylinder chamber formed in the cylinder body, a piston reciprocally fitted in the cylinder chamber and reciprocated by a driving device, a valve plate closing the cylinder chamber, and the valve plate opened to the valve A suction port that communicates with the cylinder chamber; a suction valve that opens and closes the suction port; a discharge port that is opened in the valve plate and communicates with the cylinder chamber; and a discharge valve that opens and closes the discharge port. In air compressor,
The suction port has a plurality of elongated holes, and the plurality of suction holes are arranged at the periphery of the valve plate and inside the outer edge of the suction valve. The air compressor is characterized in that a thickness around the suction hole is formed thinner than a thickness of the valve plate, and a rib is provided between the plurality of suction holes.   The suction valve includes a valve body formed of a thin plate, and the valve body is configured so that one end is fixed and the plurality of suction holes are opened and closed at a free end portion. The air compressor according to claim 1.   The air compressor according to claim 2, wherein the valve body is configured to face the plurality of suction holes on the outermost side of a free end portion.   The air compressor according to claim 1, wherein the suction hole is disposed concentrically with a center of the cylinder chamber.

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