JPH10153187A - Trochoid type gaseous compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a leaking rate from a clearance of a sliding-contact part airtightly at all times in a condition which is freely to control by moving a seal disk in an axial direction by pressure of control gas when control gas pressurized in a pressure chamber to a prescribed pressure, and push-pressing the seal disk on end surfaces of outer and inner rollers. SOLUTION: Gas led from an intake port 9 is entered into a intake hole 12 at the time of operation. When variable space and the intake hole 12 communicate with each other by rotation of inner and outer rotors 2, 1, the capacity of the variable space is compressed as well as contracting by relative rotation of both rotors 1, 2. When the variable space communicates with a substantially arc-shaped delivery hole 5, the variable space flows in an axial direction, gas is led to the seal disk 4, and is turned back. And then, gas is returned to an intake bracket 8 side, and flows out from a delivery hole 5. Control gas supplied to a control gas supplying port 13 arranged on the delivery bracket 6 flows in a pressure chamber 11, is acted on a plate surface 4c of the seal disk 4. The seal disk 4 is pushed on the end surface 29 of the outer and inner rotors 1, 2 by prescribed pressure to be regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotor formed by a rotating shaft and an outer rotor tooth profile provided on the outer side of the inner rotor so as to be eccentric and rotatable relative to the inner rotor. Gas into the variable space through the inlet,
The present invention relates to a gas compressor having a trochoid tooth profile that pressurizes the gas by a change in the volume of the variable space and sends the gas to a discharge port.

[0002]

SUMMARY OF THE INVENTION In a rotary gas machine for pumping gas by rotation of a pair of rotors, a trochoid compressor having a rotor having a trochoid tooth profile has recently been used as a compressor for gas pumping, Pumps have been widely used.

[0003] A trochoid type gas compressor for gas pressure feeding provided with a rotor having a trochoid tooth profile combines an inner rotor and an outer rotor having a trochoid tooth profile.
Due to the volume change of the trochoid tooth profile between the inner rotor connected to the rotating shaft and the outer rotor tooth profile eccentrically rotated relative to the inner rotor, the gas introduced from the suction port is pressurized and sent to the discharge port. Is configured.

In the gas-gas compressor provided with the trochoid tooth profile, the inner and outer rotors have axial suction-side and discharge-side end faces, and the suction port bracket and the inner face of the discharge-port bracket slidably contacting the end faces. In the gap with the plane perpendicular to the axis), more or less leakage of the gas compressed by the trochoid teeth occurs.

[0005] Such gas leakage causes a reduction in the compression efficiency of the trochoid type gas compressor. To prevent this, if the gap is excessively reduced, the inner and outer rotors are brought into sliding contact with the end faces of the inner and outer rotors. Galling occurs between the suction port and the inner surface of the discharge port bracket, leading to damage to the machine.

As means for preventing the occurrence of such galling and minimizing the leakage of the gas, an appropriate amount of clearance is provided by sliding between both end surfaces of the inner and outer rotors and the inner surfaces of the suction port and the discharge port bracket. Means are provided to ensure

However, such means requires a large number of man-hours in association with the rubbing operation, and after a long period of operation, the above-mentioned gap is enlarged due to wear of the sliding contact surface, and leakage is increased. Especially in small compressors, the discharge rate is small,
The ratio of the leakage amount to the discharge amount increases, and the compression efficiency decreases.

As described above, in the conventional trochoid type gas compressor, the width of the inner and outer rotors and the width of the casing accommodating the rotors, that is, the gap between the inner surface of the suction port bracket and the inner surface of the discharge port bracket. Is fixed and cannot be automatically adjusted, so that the amount of leakage cannot be controlled, and there is a problem that the leakage is unavoidable with the elapse of operation time.

According to the present invention, a gap between sliding contact portions between both end surfaces of the inner and outer rotors and inner surfaces of the suction port and the discharge port bracket is always kept gas-tight so that the amount of leakage from the gap can be controlled. Accordingly, it is an object of the present invention to provide a trochoid-type gas compressor in which compression efficiency is improved and occurrence of an accident such as galling of the sliding contact portion is prevented.

[0010]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides an outer rotor which is slidably contacted with the outer periphery of an inner rotor interlocked with a rotating shaft and the inner surface of a casing so as to be rotatable relative to the inner rotor. A gas is introduced into a variable space formed between the rotor and the inner periphery from a suction port in a suction port bracket disposed at one axial end of the rotors, and the variable space is caused by relative rotation of the rotors. In a trochoid type gas compressor which compresses a gas by a change in volume of a space and discharges the gas from a discharge port provided so as to be able to quickly pass through the variable space, a side end face of the outer rotor and the inner rotor and the suction of the casing. A seal disk that is movable in the axial direction of the rotating shaft and is not rotatable is provided between the inner surface of the discharge port bracket fixed to the opposite side of the discharge port bracket and the discharge port bracket. The gas that has reached the sealing disk via the variable space is turned back on the sealing disk and flows to a discharge port provided in the suction port bracket, and the side of the sealing disk is opposite to the side end surface side. A pressure chamber defined by the plate surface and the discharge port bracket, into which a control gas is introduced, and by a pressure of the control gas in the pressure chamber, the plate surface of the sealing disk is brought into sliding contact with the side end surface. A trochoid-type gas compressor characterized by being constituted is proposed.

Preferably, the pressure chamber is substantially a closed chamber so that the pressure of the seal disk can be controlled by the pressure of the chamber.

According to this invention, when the control gas pressurized to a predetermined pressure is introduced into the pressure chamber, the sealing disk moves in the axial direction by the pressure of the control gas, and is moved to the end faces of the outer rotor and the inner rotor. Pressed. Accordingly, the outer rotor and the inner rotor rotate while their end faces are in sliding contact with the seal disk at a predetermined pressure determined by the pressure of the control gas, and the gas from the sliding contact portion between the end face and the seal disk is rotated. Leakage is suppressed to a predetermined amount or less.

Therefore, the leakage of gas in the sliding contact portion can be adjusted by controlling the pressure in the pressure chamber. At full load, the pressure of the control gas is increased to reduce the pressing force of the sliding contact portion. It is said to increase the pressure, reduce the amount of leakage, operate at high compression efficiency, and reduce the pressure at the time of partial load or start-up, allow the leakage to some extent, and reduce the wear loss at the sliding contact part. In this way, the amount of leakage can be controlled to a level suitable for the operating state of the compressor.

In the present invention, as means for introducing a control gas into the pressure chamber, means for passing a control gas supply port through which a control gas pressurized to a predetermined pressure is supplied from the outside to the pressure chamber is provided. suggest.

According to this means, by providing the pressure control valve in the external control gas passage, it is possible to easily control the pressure of the control gas to a pressure suitable for the operation state.

Further, according to the present invention, in each of the above-mentioned means, a diaphragm with a communication hole for pressure balance, an inner peripheral side of which is fixed to the sealing disk and an outer peripheral side of which is fixed to the casing, may be provided in the pressure chamber. included.

According to this means, the rotation of the sealing disk can be easily prevented and the axial movement can be easily realized by the diaphragm, and the structure is simplified.

Further, according to the present invention, as a specific means (second means) for setting the gas flow direction to one direction, in the trochoid type gas compressor, the side end faces of the outer rotor and the inner rotor and the casing A seal disk, which is movable in the axial direction of the rotation shaft and is non-rotatable, is provided between the inner surface of the discharge port bracket fixed to the opposite side of the suction port bracket and the both sides of the seal disk. On the side surface of the rotor, a discharge hole with a bottom that can communicate with the variable space is provided, and a discharge port that communicates with the discharge hole is provided on the discharge port bracket, so that gas flows from the suction port into the variable space. Through the discharge hole of the sealing disk to be sent out to the outside.

According to this means, the one-way flow of gas flowing from the inlet bracket through the variable space to the discharge bracket through the variable space is achieved by simple means of providing discharge holes in the seal disk. Leakage can be prevented by the pressure chamber.

Further, as a third means, the present invention provides, as a third means, a discharge port bracket fixed to a side of the trochoid type gas compressor opposite to the side end faces of the outer rotor and the inner rotor and the suction port bracket of the casing. A seal disk that is movable in the axial direction of the rotating shaft and is not rotatable is provided between the inner surface and the inner surface, and a seal disk is provided between the plate surface of the seal disk on the discharge port bracket side and the discharge port bracket. The present invention proposes a trochoid-type gas compressor which is provided and is provided with a bag-like bellows which is made expandable and contractable by the movement of the sealing disk and in which a pressure chamber into which the control gas is introduced is formed.

According to the present invention, the bellows can form a completely independent pressure chamber without gas leakage, thereby preventing the gas leakage as described above.
Pressure control of the control gas can also be performed with high accuracy.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

FIG. 1 is a cross-sectional view of a trochoid type gas compressor according to a first embodiment of the present invention, taken along a rotation axis, and FIG.
5 is a sectional view taken along the line YY in FIG.

1 and 2, reference numeral 1 denotes an outer rotor, 2
Is an inner rotor that is non-rotatably and axially movably mounted on a rotating shaft 20 via a key 23, 3 is an annular casing, 8 is an inlet bracket, 6 is a discharge bracket, and 21 and 22 are rotating. This is a bearing for the shaft 20.

The outer rotor 1 is rotatably fitted to the inner peripheral surface 3a of the casing 3, and the outer rotor 1
The center 24 of the casing 3 is eccentric with respect to the rotation shaft 13 and the axis 23 of the inner rotor 2 by an eccentric amount e.

Accordingly, the outer rotor 1 slides on the inner peripheral surface 3a of the casing 3 and revolves around the inner rotor 2 while being driven by the rotation of the inner rotor 2, whereby the outer rotor 1 is provided on the outer periphery of the inner rotor 2. The gas in the variable space 10 is compressed by a change in volume of the variable space 10 formed on the inner periphery of the outer trochoid teeth 2a and the outer rotor 1.

The suction port bracket 8 is provided with a suction port 9 through which gas is introduced, and a bottomed rounded suction hole 12 communicating with the suction port 9, as shown in FIG. At a position substantially axially symmetrical with the suction hole 12, a discharge hole 5 having a bottom shape in the shape of a bead and a discharge port 7 communicating with the discharge hole 5 are provided. Then, the inlet bracket 8 and the casing 3
The discharge port bracket 6 is integrally fixed by a plurality of bolts 25.

Reference numeral 4 denotes a seal disk provided between the end surfaces 29 of the outer rotor 1 and the inner rotor 2 and the inner surface of the discharge bracket 6. The seal disk 4 is made of a material having high wear resistance, and is fitted to the rotary shaft 20 so as to be movable in the axial direction and non-rotatable.

A pressure chamber 11 is defined between the seal disk 4 and the inner surface of the discharge bracket 6 by the discharge port bracket side plate surface 4a of the seal disk 4 and the inner surface of the discharge port bracket 6. A control gas supply port 13 formed in the discharge port bracket 6 is connected to the pressure chamber 11.

During operation of the trochoid type gas compressor constructed as described above, the gas introduced from the suction port 9 enters the suction hole 12 in the shape of a bead. The rotation of the inner rotor 2 and the outer rotor 1 causes the variable space 10 and the suction port 1 to rotate.
2, the gas flows into the variable space 10 and is compressed as the volume of the variable space 10 is reduced by the relative rotation of the rotors 1 and 2, so that the variable space 10 is shaped like a bead. When the gas is communicated with the discharge hole 5, the gas flows into the variable space 10.
Flows in the axial direction to reach the sealing disk 4, where it is turned back to the suction port bracket 8 side, and the discharge hole 5
Through the outlet 7 and used outside (not shown)
Sent to

On the other hand, a control gas such as hydraulic oil or air is adjusted to a predetermined pressure by a pressure adjusting valve from a control gas supply source (not shown) to a control gas supply port 13 provided in the discharge port bracket 6. Supplied. Then, the control gas flows into the pressure chamber 11 and acts on the plate surface 4a of the sealing disk 4, and the sealing disk 4 is applied to the end surfaces 29 of the outer rotor 1 and the inner rotor 2 at the predetermined pressure adjusted as described above. Press.

As a result, the outer rotor 1 and the inner rotor 2 rotate while their end faces 29 are constantly in sliding contact with the sealing disk 4 at a predetermined pressure, and the leakage of gas from the sliding contact portion is less than a predetermined amount. Is suppressed. That is, the amount of leakage of the gas is adjusted by controlling the pressure of the control gas in the pressure chamber 11 adjusted by the pressure adjusting valve and controlling the pressing force between the end face 29 and the sealing disk 4. The pressure of the control gas in the pressure chamber 11 is adjusted so that the leakage amount is always equal to or less than the allowable amount.

With respect to the control of the pressing force of the sealing disk 4, at the time of full load, the pressing force is increased to suppress the amount of leakage, to enable operation with high compression efficiency, and at the time of partial load (light load) and start-up. , To allow some amount of leakage,
The pressing force is suppressed, and the wear resistance loss due to the contact between the sealing disk 4 and the end face 29 of the outer and inner rotors is reduced.

3 and 4 show a second embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a main part, and FIG. 4 is a view taken in the direction of arrow X in FIG. In the present embodiment, in the first embodiment shown in FIGS.
The diaphragm 16
Has an inner periphery fixed to the rear plate surface of the sealing disk 4 and an outer periphery sandwiched between the casing 3 and the discharge port bracket 6. The diaphragm 16 is provided with a plurality of communication holes 16a for pressure balance at appropriate positions in the circumferential direction. In this case, the diaphragm 16 functions to stop the rotation of the sealing disk 4 and to allow the axial movement.
Further, since the inside of the pressure chamber 11 partitioned by the diaphragm 16 is provided with the communication hole 16 a in the diaphragm 16, the pressure becomes equal.

Further, a communication passage (not shown) between the pressure chamber 11 and the suction hole 12 is provided so that the pressure in the pressure chamber 11 can be released to the suction hole 12 side. The pressure in the pressure chamber 11 can be adjusted by controlling the amount of release from the pressure chamber 11 by providing an illustration (not shown).

5 to 8 show a third embodiment of the present invention. FIG. 5 is a sectional view taken along the axis of rotation of a trochoid type gas compressor. FIG. 6 is a sectional view taken along line WW of FIG. 7 is a sectional view of the seal disk, and FIG. 8 is a front view of the seal disk. In this embodiment, gas flows in the axial direction from the inlet bracket 8 and is led out from the sealing disk 4.

That is, in FIG. 5 to FIG.
On the inner side, that is, on the end face 29 side of the outer rotor 1 and the inner rotor 2, a discharge hole 5 having a beveled shape and a bottom similar to that of the first embodiment can communicate with the variable space 10 and is shown in FIG. Thus, it is engraved at a position substantially symmetrical with the suction hole 12. The discharge hole 5 communicates with the seal disk 4 and the discharge port 7 provided through the casing 3. 4C is a rotary shaft insertion hole of the seal disk. Other configurations are shown in FIGS.
Is the same as the first embodiment shown in FIG.

In the third embodiment, the variable space 1 is moved from the suction port 9 of the suction port bracket 8 through the suction hole 12.
The gas introduced into the outer rotor 1 and the inner rotor 2
When the discharge hole 5 provided in the sealing disk 4 is communicated with the variable space by the relative rotation of the seal disk 4, as shown by an arrow M in FIG. It is sent out from the discharge hole 7 to a use destination (not shown). On the other hand, similarly to the first embodiment shown in FIGS. 1 and 2, a control gas is introduced from a control gas inlet 13 into the pressure chamber 11 formed on the back of the seal disk 4, and the seal disk 4 is It presses against the end surface 29 to suppress gas leakage between both surfaces.

Further, in this embodiment, the discharge hole 5 and the discharge port 7 on the seal disk 4 side and the suction port bracket 8
By inverting the suction port 12 and the suction port 9 on the side, gas can be sucked from the seal disk 4 side and discharged to the suction port bracket 8 side.

9 and 10 show a trochoid-type gas compressor according to a fourth embodiment of the present invention. FIG. 9 is a sectional view taken along the axis of rotation, and FIG. 10 is a view taken in the direction of arrows V--V in FIG. is there.

In this embodiment, a bag-shaped bellows 30 is provided between the discharge port bracket 6 and the plate surface 4a of the seal disk 4 on the discharge port bracket 6 side.
Is provided with a pressure chamber.

9 and 10, reference numeral 30 denotes a bellows made of a flexible material that can expand and contract in the direction of the rotation axis 20. The bellows 30 has its bottom 33 fixed to the plate surface 4a of the sealing disk 4. The end of the outer bellows 32, which extends from the bottom 33 in the outer circumferential direction and is expandable and contractable, is clamped and fixed between the end surface of the discharge port bracket 6 and the end surface of the casing 3, and extends inward from the bottom 33. The extendable inner bellows 31 is fixed to the inner surface of the discharge port bracket 6.

A pressure chamber 11 is formed inside the bag-shaped bellows 30, and a control gas is supplied to the pressure chamber 11 from a control gas supply port formed in the discharge port bracket 6. Has become.

In the trochoid type gas compressor shown in FIGS. 9 and 10, when a control gas regulated by a pressure regulating valve (not shown) is introduced from the control gas supply port 13 into the pressure chamber 11, the control gas is released. The bellows 30 is extended by the pressure of the gas, and the sealing disk 4 is pressed against the side end surfaces of the inner rotor 2 and the outer rotor 1, and the gas leaks from the sliding contact surface between the sealing disk and the rotors. Is blocked. In this case, the pressure chamber 1 is provided inside the bag-shaped bellows 30.
Since the pressure chamber 1 is formed, the pressure chamber 11 is completely sealed, preventing leakage of the control gas and easily adjusting the pressure of the control gas.

In the first to fourth embodiments described above, when such a trochoid gas machine is used as a refrigeration compressor, a refrigeration load is detected by a sensor, and the pressure chamber 11 The pressure of the control gas supplied to the inside is controlled via a pressure control valve, and the leakage amount is adjusted according to the refrigeration load.

[0046]

As described above, according to the present invention, a sealing disk is provided inside the gas compressor so as to be in sliding contact with the outer and inner rotor end faces, and the sealing disk is pressed by the control gas in the pressure chamber. With such a configuration, the end surface and the plate surface of the sealing disk are always slid while being pressed with a predetermined pressing force by the pressure of the control gas in the pressure chamber, and the amount of gas leakage at the sliding contact portion , So that the trochoid-type gas compressor can be operated with high compression efficiency.

Further, by adjusting the pressure of the control gas, the amount of leakage of the sliding contact portion can be controlled according to the operation state, and the amount of leakage can be suppressed in the entire operation range.
In addition, it is possible to provide a trochoid type gas compressor in which the friction loss of the sliding contact portion is reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a trochoidal gas machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

4 is a view as viewed in the direction of the arrow X in FIG. 3;

FIG. 5 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line WW of FIG. 5;

FIG. 7 is a sectional view of a seal disk according to the third embodiment.

FIG. 8 is a front view of the seal disk.

FIG. 9 is a partial longitudinal sectional view showing a fourth embodiment of the present invention.

10 is a view taken in the direction of arrows VV in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer rotor 2 Inner rotor 3 Casing 4 Sealing disk 5 Discharge hole 6 Discharge port bracket 7 Discharge port 8 Suction port bracket 10 Variable space 11 Pressure chamber 12 Suction hole 13 Control gas supply port 16 Diaphragm 20 Rotating shaft 29 End face 30 Bellows

Claims (6)

[Claims] A variable space formed between an outer periphery of an inner rotor interlocked with a rotation shaft and an inner periphery of an outer rotor slidably in contact with an inner surface of a casing and rotatable relative to the inner rotor. A gas is introduced from a suction port in a suction port bracket disposed at one axial end of the two rotors, and the gas is compressed by a volume change of the variable space due to a relative rotation of the two rotors, whereby the variable space is compressed. A trochoid-type gas compressor that discharges from a discharge port provided so as to be able to quickly communicate with the inner surface of a discharge port bracket fixed to a side end face of the outer rotor and the inner rotor and a side of the casing opposite to the suction port bracket. A seal disk which is movable in the axial direction of the rotating shaft and is disabled from rotating is provided between
The gas that has reached the seal disk from the suction port via the variable space is turned back by the seal disk and flows to a discharge port provided in the suction port bracket, and the side end face side of the seal disk is configured. Is provided with a pressure chamber defined by the opposite plate surface and the discharge port bracket, and into which a control gas is introduced, and the pressure of the control gas in the pressure chamber causes the plate surface of the sealing disk to contact the side end surface. A trochoid-type gas compressor, which is configured to be brought into sliding contact. 2. The trochoidal gas compressor according to claim 1, wherein a control gas supply port through which a control gas pressurized to a predetermined pressure is supplied from outside to said pressure chamber. 3. The pressure chamber according to claim 1, wherein the pressure chamber is substantially a closed chamber so that the pressure of the seal disk can be controlled by the pressure of the chamber. Trochoid gas compressor. 4. The pressure chamber according to claim 1, further comprising a diaphragm having a communication hole for pressure balance, an inner peripheral side of which is fixed to the sealing disk and an outer peripheral side of which is fixed to the casing. Trochoid gas compressor. 5. A variable space formed between an outer periphery of an inner rotor interlocked with a rotation shaft and an inner periphery of an outer rotor slidably in contact with an inner surface of a casing and rotatable relative to the inner rotor. A gas is introduced from a suction port in a suction port bracket disposed at one axial end of the two rotors, and the gas is compressed by a volume change of the variable space due to the relative rotation of the two rotors, whereby the variable space is compressed. A trochoid-type gas compressor that discharges from a discharge port provided so as to be able to quickly pass through, and an inner surface of a discharge port bracket fixed to a side end face of the outer rotor and the inner rotor and a side of the casing opposite to the suction port bracket. A seal disk that is movable in the axial direction of the rotary shaft and that is not rotatable, and that is communicable with the variable space on the side surfaces of both the rotors of the seal disk. A discharge port is provided, and the discharge port bracket is provided with a discharge port communicating with the discharge port, and gas flows in the axial direction through the variable space from the suction port through the discharge hole of the seal disk. A trochoidal trochoidal gas compressor configured to be delivered to the outside. 6. A variable space formed between an outer periphery of an inner rotor interlocked with a rotating shaft and an inner periphery of an outer rotor slidably in contact with an inner surface of a casing and rotatable relative to the inner rotor. A gas is introduced from a suction port in a suction port bracket disposed at one axial end of the two rotors, and the gas is compressed by a volume change of the variable space due to the relative rotation of the two rotors, whereby the variable space is compressed. A trochoid-type gas compressor that discharges from a discharge port provided so as to be able to quickly pass through, and an inner surface of a discharge port bracket fixed to a side end face of the outer rotor and the inner rotor and a side of the casing opposite to the suction port bracket. A seal disk that is movable in the axial direction of the rotary shaft and that is not rotatable, between the plate surface of the seal disk on the discharge port bracket side and the discharge port bracket. A trochoid-type gas compressor, characterized in that the trochoid-type gas compressor is provided, and is provided with a bag-shaped bellows which is made expandable and contractable by the movement of the sealing disk and in which a pressure chamber into which the control gas is introduced is formed. .