JP2003286950A - Non-lubricant compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-lubricant compressor with improved delivery flow rate. <P>SOLUTION: This non-lubricant compressor is provided with a non-lubricant compressor part to discharge gas sucked from an inlet port to be compressed by a piston in a cylinder and discharged from a discharge port. At the inlet port and the discharge port, an inlet valve and a discharge valve are disposed to be opened and closed by motion of the piston. Area of the inlet port is set at 4-12% to compression area in the cylinder. Lift area of the discharge valve is set at 2-10% to the compression area. Pressure loss is restricted in suction and delivery. Relation between suction quantity and delivery quantity can be closer to the optimum, and delivery flow rate can be increased. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-lubricated compressor having a non-lubricated compression section.

[0002]

2. Description of the Related Art An unlubricated compressor for compressing gas is disclosed in Japanese Patent Laid-Open No. 2001-82328. This unlubricated compressor is equipped with four unlubricated compression parts. By connecting these compression parts in series, a gas such as air or nitrogen is compressed in four stages, and the gauge pressure is 30MP.
The pressure is increased to a and discharged.

The development of a gas filling device for compressing and supplying a fuel such as natural gas to a generator for a micro gas turbine by utilizing such a four-stage unlubricated compressor,
The applicant has tried.

Since the pressure becomes too high when the non-lubricated compressor for four-stage compression is used, the applicant has
A gas filling device was prototyped using a compressor modified so that the fuel flows in parallel to the four compression parts and the compressed fuel is collected and discharged from the four compression parts into one.

[0005]

In the modified compressor described above, the discharge flow rate of the compressed gas did not reach the target flow rate. This is probably because the inhalation efficiency is poor.

[0006] The applicant of the present invention determines the passage area of the suction port, the passage area of the discharge port, etc. so that the discharge flow rate becomes the target flow rate.
Designed to be optimal. However, since the structure of the suction valve and the discharge side is complicated, it is considered that the discharge flow rate does not reach the target flow rate because it is not as designed.

The present invention provides a non-lubricated compressor having an improved discharge flow rate.

[0008]

In order to solve the above problems, the present invention relates to a non-lubricated compressor provided with a non-lubricated compression part for compressing gas sucked from an intake port with a piston in a cylinder and discharging it from a discharge port. A suction valve and a discharge valve that are opened and closed by the movement of a piston are arranged at the suction port and the discharge port, and the area of the suction port is 4 to 12% of the compression area in the cylinder. The lift area is set to 2 to 10% with respect to the compressed area.

Further, in the non-lubricated compressor, a plurality of suction ports and discharge ports are respectively formed, and a suction valve and a discharge valve which are opened and closed by movement of a piston are arranged at each of the suction port and the discharge port. The total area of the suction port is 4 to 12% of the compressed area in the cylinder.
The total lift area of the discharge valve is set to 2 to 10% of the compressed area.

Further, the gas sucked from the suction port is used as a fuel gas, and the compressed fuel gas is supplied to the micro gas turbine.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

1 to 4 are views showing an embodiment of the present invention. FIG. 1 shows a front surface of a non-lubricated compressor of the present invention, FIG. 2 shows a plane of the same non-lubricated compressor, and FIG. 3 shows the same. FIG. 4 shows a cross section of a compression part of the unlubricated compressor, and FIG. 4 shows a structure of an intake valve of the unlubricated compressor.

In the figure, reference numeral 1 is a non-lubricated compressor main body, which is mainly an electric motor section 2 in which an electric motor is arranged.
And a compression part 3 composed of four non-lubricated compression parts. The compression unit 3 is provided with four unlubricated compression units 3A, 3B, 3C and 3D that are radially arranged, and the gas compressed by the compression unit 3A, the compression unit 3B, the compression unit 3C and the compression unit 3D is It is configured to be collected and discharged as one. Further, each of these compression units has a substantially identical structure.

The unlubricated compressor main body 1 shown in FIGS. 1 and 2 is shown only as a main body, but is actually used as a non-lubricated compressor unit with legs and cooling fans described later attached. Is.

That is, the unlubricated compressor body 1 is supported by a leg portion (not shown) so as to be floated from the arrangement surface, and this leg portion supports the side portion of the electric motor portion 2 via an elastic body. To do.

A board is arranged at the lowermost portion of the leg portion, and a fan composed of a cooling fan and an electric motor is installed on the board to blow air to the surface of the electric motor section 2. . Duct plates are arranged at intervals on the side of the unlubricated compressor body 1, that is, on the sides of the electric motor unit 2 and the compressor unit 3, so that cooling air flows, and the duct plates are the unlubricated compressor. It serves as an exterior case for the unit.

Therefore, during operation of the unlubricated compressor main body 1, the electric motor is operated and air is blown from below the electric motor section by the cooling fan, and the electric motor section and the compressor section are cooled from the outer surface. .

At the outer peripheral portions of both ends of the cylinder 11 shown in FIG. 3, there are provided cut surfaces (commonly known as C chamfers) 12 at an angle of approximately 45 degrees with respect to the axial direction of the cylinder 11. Discharge plates 13 and 14 and suction plates 15 and 16 are arranged on the axial end surfaces of the cylinder 11, respectively. As a result, an annular groove seal space 31 having a substantially triangular cross section is formed between the cylinder 11, the discharge plate 14, and the cylinder head 17, and between the cylinder 11, the discharge plate 15, and the housing 18. Although not shown, an O-ring is arranged in this seal space 31.

Reference numeral 21 denotes a piston for compressing the sucked gas. A piston ring 22 is attached to the piston 21. Reference numeral 23 is a compression space, and the cross-sectional area of this compression space (also called compression area or bore diameter area)
However, it becomes important in relation to the intake area and lift area.

The suction port 24 is formed in the suction plate 16. The passage area of this suction port is the suction port area. Reference numeral 25 is a suction valve attached to the suction plate 15, and 26 is a space. The suction valve 25 can be moved to this space, and the movement amount thereof is set to a predetermined distance, for example, about 1 mm. Then, when the suction valve 25 moves into the space 26, the suction port 24 is opened.

27 is a discharge port formed in the discharge plate 13, 28 is a discharge valve attached to the discharge plate 13, 29 is a space, and the discharge port 27 is opened when the discharge valve moves to this space. Is.

Further, a value obtained by multiplying the moving dimension of the discharge valve 28 and the outer circumference of the space in which the discharge valve is arranged corresponds to the lift area, and this lift area, the above-mentioned compression area and the area of the suction port. The discharge flow rate can be changed by changing the relationship of

Reference numeral 30 denotes a discharge passage formed in a circular shape, and the inner diameter of this passage is set to 18 mm, for example.

The front side of the suction plates 15 and 16 is shown in the upper part (A) of FIG. 4, and the X of the upper part (A) is shown in the lower part (B).
The X-ray cross section is shown.

The suction plates 15 and 16 and the discharge plates 13 and 14 are basically the same. The differences are the presence and shape of the central through hole, and the number of valves installed.

As shown in (A), eight intake valves 25 are arranged on the same circle at equal intervals. The suction valve 25 is pressed downward from above in the drawing by a spring, and is set so as to be able to move upward by about 1 mm by a pressure change when the piston 21 moves upward in the drawing.

The four discharge valves 28 are arranged on the same circle at equal intervals. The discharge valve 28 is also pressed by a spring, and is set so as to be able to move to the spring side by about 1 mm due to the pressure fluctuation when the piston 21 moves.

Therefore, the lift area of the discharge valve 28 is
It is a value calculated by (movement distance) × (perimeter of valve).

Therefore, the total list area (four times the lift area) is set to 2 to 10% of the compression area, and the total area of the suction port 24 (the area of one suction port). 8 times) is set to 4 to 12% with respect to the compressed area.

In the non-lubricated compressor configured as described above, since the ratio of the suction area affecting the suction amount and the lift area affecting the discharge amount to the compression area is set appropriately, the suction efficiency is increased. However, the discharge flow rate can be brought close to the target value.

For example, the suction valve 25 having the same shape as that of the present application
Prototypes with 6 and 10 were
Comparison was made with the invention of the present application, that is, with eight provided.

It was confirmed that the discharge flow rate increased and the suction efficiency was improved in the case of the present invention in which eight pieces were provided, compared with the prototype in which six pieces were provided.

Further, comparing the prototype of 10 pieces and the one of 8 pieces of the present invention, the trial piece of 10 pieces each has almost the same discharge flow rate as that of the present application, and the suction efficiency is almost the same. It was confirmed that they are equivalent.

Therefore, by providing eight suction valves, the total area of the suction port is set to 4 to 12% of the compression area and the total lift area is set to 2 to 10% to maximize the discharge flow rate, It is thought that the inhalation efficiency can be almost maximized.

Thus, the effect of maximizing the discharge flow rate can be obtained by adjusting the number of suction valves and discharge valves, so that the discharge flow rate can be easily adjusted.

When this unlubricated compressor is used for compressing fuel such as natural gas and supplying it to the micro gas turbine, it is possible to supply the discharge flow rate close to the design, and the air-fuel ratio of the micro gas turbine. Can also keep good.

[0037]

As described above, according to the invention as set forth in claim 1, there is provided a non-lubricated compression portion for compressing the gas sucked from the suction port with the piston in the cylinder and discharging the gas from the discharge port. In the lubricating compressor, an intake valve and a discharge valve that are opened and closed by the movement of a piston are arranged at the intake port and the discharge port, and the area of the intake port is 4 to 12% of the compression area in the cylinder, The lift area of the discharge valve is 2 to 10% of the compressed area.
With this setting, the pressure loss of suction and discharge can be suppressed, and the relationship between the suction amount and the discharge amount can be made closer to the optimum and the discharge flow rate can be increased.

According to the second aspect of the invention, in the unlubricated compressor, a plurality of suction ports and discharge ports are formed, and the suction ports and the discharge ports are opened and closed by the movement of the piston. A suction valve and a discharge valve, the total area of the suction port is 4 to 12% with respect to the compression area in the cylinder, and the total lift area of the discharge valve is 2 with respect to the compression area. Since it is set to 10%, the pressure loss of suction and discharge can be suppressed, and the relationship between the suction amount and the discharge amount can be made closer to the optimum and the discharge flow rate can be increased. It can be easily obtained by adjusting the number.

According to the third aspect of the invention, the gas sucked from the suction port is used as the fuel gas, and the compressed fuel gas is supplied to the micro gas turbine. Therefore, the discharge flow rate close to the design is secured. Therefore, the air-fuel ratio of the micro gas turbine and the like can be kept good.

[Brief description of drawings]

FIG. 1 is a front view of a non-lubricated compressor of the present invention.

FIG. 2 is a plan view of the same unlubricated compressor.

FIG. 3 is a cross-sectional view showing a compression section of the unlubricated compressor.

FIG. 4 is an explanatory view showing a structure of an intake valve of the unlubricated compressor.

[Explanation of symbols]

1 Unlubricated compressor body 3A, 3B, 3C, 3D Compressor 11 cylinders 21 pistons 24 suction port 25 suction valve 27 outlet 28 Discharge valve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takehiro Nishikawa             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takashi Atomic             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hideyuki Inoue             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Shinya Itabashi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hirosuke Ogasawara             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F-term (reference) 3H003 AA02 AB07 AC02 CC07

Claims (3)

[Claims] 1. A non-lubricated compressor having a non-lubricated compression part for compressing a gas sucked from an intake port by a piston in a cylinder and discharging the gas from a discharge port, wherein the intake port and the discharge port are opened and closed by the movement of the piston. A suction valve and a discharge valve, the area of the suction port is 4 to 12% with respect to the compression area in the cylinder, and the lift area of the discharge valve is 2 to 10 with respect to the compression area. %
A non-lubricated compressor characterized by setting 2. In a non-lubricated compressor having a non-lubricated compression part for compressing a gas sucked from an intake port with a piston in a cylinder and discharging the gas from a discharge port, the suction port and the discharge port are each formed in plural, and An intake valve and a discharge valve, which are opened and closed by the movement of a piston, are arranged at the suction port and the discharge port, respectively, and the total area of the suction port is set to 4 to 12% of the compression area in the cylinder. The unlubricated compressor is characterized in that the total lift area of the discharge valve is set to 2 to 10% of the compressed area. 3. The non-lubricated compressor according to claim 1, wherein the gas sucked from the suction port is used as a fuel gas, and the compressed fuel gas is supplied to a micro gas turbine.