JPH0231588Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is based on a system in which a rotary compressor is coaxially attached to the crankshaft of a reciprocating compressor, and intake air is supercharged by the rotary compressor. This article relates to an intake supercharging compressor.

(Prior art) In the case of a reciprocating compressor that compresses gas by the reciprocating movement of a piston within a cylinder, there are many problems such as resistance from suction and discharge valves, gas leakage, and gaps within the cylinder at the end of the compression process ( The suction pressure and discharge pressure become lower than the theoretical values due to expansion of gas remaining in the top dead center clearance during the suction process. Particularly in the suction process, the suction pressure Pi in the cylinder is lower than the atmospheric pressure Pa by the pressure loss ΔP of the gas in the suction valve (Pi=Pa−ΔP), and becomes a negative pressure. This negative pressure then opens the intake valve, and fresh air is sucked into the cylinder.

By the way, the density ρ of a gas is generally expressed by the following equation of state: ρ=P/RT where: P: Absolute pressure R: Gas constant T: As is clear from the absolute temperature, it is proportional to the absolute pressure. Therefore, in order to increase the discharge efficiency (volume efficiency) of the compressor and increase the weight flow rate of the gas to be discharged,
It is necessary to keep the gas density ρ expressed by the previous equation high by increasing the gas suction pressure.

(Problem that the invention aims to solve) However, as mentioned above, the suction pressure of the compressor is generally negative pressure, so the problem is that the gas density cannot be maintained high and the discharge efficiency cannot be increased. There is. In addition, the flow of fresh air into the cylinder during the suction stroke is based on the pressure difference corresponding to the pressure loss at the suction valve, so the filling efficiency (suction efficiency) into the cylinder is poor, and as a result, the discharge efficiency is also low. There is also the problem of not being able to raise it.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to create an intake supercharging system with a simple and compact structure that can increase intake efficiency and discharge efficiency by supercharging intake air. We are in providing compressors.

(Means for Solving the Problems) In order to achieve the above object, the present invention uses a rubber ring valve as an intake valve, and uses a rotary compressor on the crankshaft of a reciprocating compressor that sucks fresh air from inside the crankcase. The rotary compressor was directly connected to the compressor, and the discharge port of the rotary compressor was opened into the crankcase of the reciprocating compressor, thereby constructing an intake supercharging compressor.

(Function) Since the fresh air is compressed and pressurized by the rotary compressor before being sucked into the reciprocating compressor, the suction pressure in the reciprocating compressor is increased and the amount of suction gas is increased. This increases the suction efficiency and discharge efficiency of the reciprocating compressor. In addition, since a reciprocating compressor uses a rubber ring valve for the suction valve and sucks fresh air from inside the crankcase, the rotary compressor is directly connected to the crankcase of the reciprocating compressor. The discharge port of the compressor can be opened directly into the crankcase, and the compressor itself has a simple structure.
Moreover, it can be configured compactly.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view of a main part of an intake supercharging compressor according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1. In the figure, reference numeral 1 denotes a reciprocating compressor, in which a piston 3 is fitted in a cylinder block 2 so as to be vertically slidable, and the upper part of the cylinder block 2 is closed by a cylinder head 4.
The piston 3 is connected to the upper end of a connecting rod 6 via a piston pin 5, and the lower end of the connecting rod 6 is connected to the outer periphery of an eccentric portion of a flywheel 8 fitted to a crankshaft 7 via a ball bearing 9. connected. A crankcase 10 is provided at the bottom of the cylinder block 2, and inside this crankcase 10 (crank chamber)
The connecting rod 6 and flywheel 8 are housed inside. Further, the crankshaft 7 is directly connected to an electric motor (not shown), and is rotationally driven by this electric motor.

In the cylinder block 2, there is a compression chamber _S1 defined by the piston 3 and the cylinder head 4.
is formed in the cylinder head 4, and a discharge chamber S ₂ ,
S ₃ is formed, and both discharge chambers S ₂ and S ₃ communicate with each other via a plurality of ventilation holes 11 formed in the partition wall 4a. The discharge chamber _S3 communicates with an air tank (not shown) through a discharge hole 12 formed at the top of the cylinder head 4.

Incidentally, a suction valve 20 is provided on the outer periphery of the upper end of the piston 3, and a discharge valve 30 is provided on the outer periphery of the upper end of the cylinder block 2. The suction valve 20 is constituted by a rubber ring valve 22 that is seated in a V-groove 21 formed on the entire circumference of the upper end of the piston 3, and the discharge valve 30 is likewise constructed of a rubber ring valve 22 that is seated in a V-groove 21 formed on the outer circumference of the upper end of the piston 3. It consists of a rubber ring valve 32 seated in a V-groove 31 formed in the valve. And piston 3, cylinder block 2
A plurality of through holes 23 . . . , 33 are bored in the peripheral wall of the V-grooves 21 , 31 respectively.

On the other hand, in the figure, 101 is a rotary compressor,
This is the crankcase 10 of the reciprocating compressor 1.
It is fixedly installed on the front surface (left end surface in Fig. 1).
This rotary compressor 101 has a cylindrical casing 1
02, a disc-shaped rotor 103 that sequentially slides on the inner peripheral surface of the casing 102, and side covers 104 and 105 that cover both sides of the casing 102. are bonded to each other with a predetermined eccentricity. Thus, the space surrounded by the casing 102 and the rotor 103 constitutes a compression chamber _S4 .

Further, an inlet 106 is formed in the one side cover 104 (see FIG. 2), and the peripheral side wall 104
An air filter 107 is attached to cover the intake port 106. And casing 1
A suction hole 108 and a discharge hole 109 are bored in the upper part of the suction port 1.
06, and the discharge hole 109 is connected to the side lid 1.
05, and the discharge port 110 opens directly into the crankcase 10. Note that 109a is a reed valve type discharge valve for opening and closing the discharge port 109. Also, the suction hole 10
8 and the discharge hole 109 are cut off from communication with each other by a vertically movable partition plate 112 whose ends are always abutted and engaged with the outer periphery of the rotor 103 by means of a spring 111.

In the above, the position of the rotor 103 of the rotary compressor 101 is adjusted so that the discharge is completed when the piston 3 of the reciprocating compressor 1 is at the bottom dead center.

Next, the operation of this intake supercharging compressor will be explained.

When the crankshaft 7 is rotationally driven by an electric motor (not shown), both the reciprocating compressor 1 and the rotary compressor 101 are driven. By rotating in the direction of the arrow shown in the figure (clockwise), fresh air is transferred to the air filter 107 and the intake port 10.
6 and the suction hole 108 into the compression chamber _S4 , where it is sequentially compressed and pressurized, and then passed through the discharge hole 109 and the discharge port 110 to the crankcase 1.
It is discharged within 0.

By the way, as mentioned above, when the discharge of the air compressed by the rotary compressor 101 into the crankcase 10 is completed, the piston 3 of the reciprocating compressor 1 is at the bottom dead center position as shown in the figure, that is, the suction Since it is in the position just before entering the stroke, the compressed air discharged into the crankcase 10 uses its pressure to push open the rubber ring valve 22 of the suction valve 20, passes through the through holes 23, and flows into the compression chamber _S1. do. Since the pressure of the incoming air at this time is higher than the conventional suction pressure, the air density is high and the amount of air filled into the compression chamber S ₁ is also large, which increases the suction efficiency (filling efficiency) of the reciprocating compressor 1.
becomes higher.

The air flowing into the compression chamber _S1 is compressed and pressurized by the rise of the piston 3 during the compression stroke, but when the pressure exceeds a specified value, the pressure causes the rubber ring of the discharge valve 30 to The valve 32 is pushed open, and the air is discharged into the discharge chambers S ₂ and S ₃ through the through holes 33 . . . , and filled into an air tank (not shown) through the discharge hole 12 .

In the above, since fresh air is compressed by the rotary compressor 101 before being sucked in by the reciprocating compressor 1, the suction efficiency can be increased as described above, and as a result, the discharge efficiency can also be increased. be able to. Furthermore, since the reciprocating compressor 1 uses a rubber ring valve 22 as the suction valve 20 and sucks fresh air from inside the crankcase 10, the rotary compressor 1
01 is directly connected to the crankcase 10 of the reciprocating compressor 1, and its discharge port 110 is connected directly to the crankcase 10 of the reciprocating compressor 1.
0, and the compressor can be constructed with a simple and compact structure. Furthermore, the cycle of the rotary compressor 101 is adjusted so that the discharge is completed when the piston 3 of the reciprocating compressor 1 is at the bottom dead center position. , the reciprocating compressor 1 is in the compression stroke with a heavy load, and conversely, when the rotary compressor 101 is in the compression stroke with a heavy load, the reciprocating compressor 1 is in the suction stroke with a light load. Load fluctuations during one cycle of the entire machine can be suppressed to a small level, which is advantageous in terms of load balance.

Although the above description has particularly been made of an air compressor that handles air, the present invention can be applied to compressors that handle various other gases.

(Effects of the invention) As is clear from the above explanation, according to the invention, a rubber ring valve is used as the suction valve, and a rotary compressor is attached to the crankshaft of a reciprocating compressor that sucks fresh air from inside the crankcase. Since the intake supercharging compressor is constructed by directly connecting the rotary compressor and opening the discharge port of the rotary compressor into the crankcase of the reciprocating compressor, fresh air is It is compressed and pressurized by the compressor, the suction pressure in the reciprocating compressor is increased, the amount of suction gas is also increased, the suction efficiency and discharge efficiency of the compressor are increased, and the compressor itself has a simple and compact structure. The effect is that it can be configured as follows.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of an intake supercharging compressor according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1. Explanation of symbols: 1... Reciprocating compressor, 3... Piston, 7... Crankshaft, 10... Crank case, 20... Suction valve, 22... Rubber ring valve, 101... Rotary compressor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A rotary compressor is directly connected to the crankshaft of a reciprocating compressor that uses a rubber ring valve as an intake valve to suck fresh air from inside the crankcase, and the rotary compressor An intake supercharging compressor characterized in that the discharge port of the compressor is opened in the crankcase of the reciprocating compressor. (2) The cycle of the rotary compressor is adjusted so that the discharge is completed when the piston of the reciprocating compressor is at the bottom dead center position. The intake supercharging compressor described in Section 1.