JP2519832B2 - Manufacturing method of rotary fluid compression / suction machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary fluid compression / suction machine, and more particularly, to a rotary fluid compression machine or fluid containing one or a pair of rotors in a casing. In the suction machine,
The present invention relates to a rotary fluid compression / suction machine capable of transferring fluid without leakage or oil contamination.

(Prior Art) As a rotary fluid compression / suction machine, a pump or compressor (hereinafter sometimes simply referred to as a screw pump) widely known as a screw pump, a screw compressor, or a screw compressor is typical. is there.

In many of these screw pumps, a pair of male and female screw rotors having a spiral tooth profile in which the outer peripheral tooth profile is appropriately twisted in the axial direction rotate while meshing with each other, and the outer periphery of the tooth profile, the inner surface of the casing, and the tooth profile of the pair of male and female screw rotors. The space formed by each part is sequentially reduced by the meshing of the teeth due to the rotation of the rotor to compress the fluid or increase the fluid to suck the fluid.

It should be noted that "rotating while meshing with each other" includes that the pair of screw rotors rotate in synchronization with each other while maintaining a small gap.

In such a rotary fluid compression / suction machine, the meshing gap between the rotors and the clearance between the rotor and the casing are extremely important from the viewpoint of the sealing property of the high-pressure fluid and the like. Influence the performance of. In particular, in screw pumps, the machining accuracy of the spiral tooth profile of a pair of male and female screw rotors greatly affects the compression / suction performance of fluid, so careful attention and high machining accuracy are required for machining the spiral tooth profile. To be done.

Further, in order to prevent backflow leakage of the high-pressure fluid from the meshing gap between the pair of rotors, measures such as oil injection and increasing the rotation speed of the rotor have been taken.

However, in order to inject a large amount of oil, an apparatus such as an oil separator is required, and increasing the rotor rotation speed causes various problems such as noise and increased mechanical loss such as a bearing portion.

In order to solve these problems, JP-B-56-17523 or JP-B-55-15639 discloses that electroplating is performed while rotating a pair of male and female rotor bases, or plating is applied to a rotor base in advance. It has been proposed to adjust the meshing gap between a pair of male and female rotor bases to an appropriate value while melting the layers.

Further, Japanese Patent Publication No. 56-21881 discloses that a pair of male and female rotor bases is dipped in a thermosetting resin to form a thermosetting synthetic resin coating layer having a different thickness according to the meshing gap between the male and female rotor bases. Then, the rotor base on the driving side can be rotated and coated while heating the rotor base. In Japanese Patent Publication No. 56-27712, metal molding is performed around the core of the rotor,
Moreover, methods of forming a metal plating layer on the surface thereof have been proposed, respectively.

(Problems to be Solved by the Invention) In a rotor manufacturing method for plating a rotor substrate proposed in the above Japanese Patent Publication No. 56-17523 or Japanese Patent Publication No. 55-15639, it is possible to achieve a high level of machining in the rotor. It has an advantage that it is easy to process without requiring the dimensional accuracy.

However, in these Japanese Patent Publications, even though the metal plating layer is required only on the rotor substrate,
It is not specifically shown how to remove the plating layer adhering to the jig and the supporting plate immersed in the plating solution as a conductor, and since the plating layer adheres to a uniform thickness, It has not been solved that it is not suitable for forming different plating layers to improve the meshing accuracy.

Further, the method of forming a coating layer of thermosetting resin on the outer surfaces of a pair of male and female rotor bases proposed in Japanese Patent Publication No. Sho 56-21881 makes it possible to make the mesh between rotor bases an appropriate small gap. However, the clearance between the rotor base and the casing base cannot be set to an appropriate small gap, and such a method causes a phenomenon in which resin adheres to the rotor base as well.

Further, in the method proposed in Japanese Examined Patent Publication No. 56-27712, unless the mold shape is accurately manufactured as a result, the dimensional accuracy of the rotor before plating is not maintained, resulting in a large number of man-hours and economic cost. Not the traditional way.

As described above, in the prior art, only the meshing gap between the pair of male and female rotor bases is formed to a proper small gap, and the meshing gap between the rotor bases and the clearance between the rotor base and the casing base are both small. The compression / suction machine including a pair of rotors and the casing cannot easily be formed in the above-mentioned manner, and the fluid easily leaks from the clearance between the rotor and the casing during operation. It becomes one.

Therefore, an object of the present invention is to provide a rotary fluid compression / suction system in a fluid compressor or the like in which a rotating rotor is contained in a casing, in which fluid is unlikely to leak from a clearance between the rotor and the casing and which has excellent performance such as compression performance. It is to provide a method of manufacturing a machine.

(Means for Solving the Problems) The above-mentioned problem, that is, it is difficult to easily form a meshing gap between the rotor bases and a clearance between the rotor base and the casing base into an appropriate small gap. It can be solved by the present invention having the following configurations.

That is, according to the present invention, when manufacturing a fluid type compression / suction machine in which a rotor is contained in a casing, after assembling parts such as a rotor base forming the rotor and a casing base forming the casing, the rotor base is assembled. In order to make the clearance including the gap between the outer peripheral surface of the rotor base body and the inner peripheral surface of the casing base body an appropriate small gap while rotating the rotor in the direction of sucking fluid at a lower rotation speed than that during steady operation. A gaseous compound that adheres to the outer peripheral surface of the rotor base body and the inner peripheral surface of the casing base body to form an adhesion hardening layer is supplied from the fluid suction port of the casing base body and adheres to the outer peripheral surface of the rotor base body and the like. The residual gaseous compound discharged from the fluid discharge port of the casing base without being re-supplied to the fluid suction port and circulated for reuse. A valve provided to open and close the circulation circuit is closed on the fluid discharge port side of the circulation circuit to be used for circulation, and when the rotor base is set to the rotational speed during steady operation, the valve is closer to the fluid discharge port than the valve. The rotary fluid compression / suction is characterized in that an adhesion hardening layer is sequentially laminated on the outer peripheral surface of the rotor base body and the inner side surface of the casing base body until the ultimate pressure indicated by a pressure gauge provided to reach a predetermined pressure. It is in the manufacturing method of the machine.

In the present invention having such a configuration, supply of a gaseous compound that forms an adhesion hardening layer and supply of hot air that polymerizes and hardens the gaseous compound that adheres to the outer peripheral surface of the rotor base and the inner peripheral surface of the casing base by polymerization. By alternately performing the above steps, it is possible to reduce the amount of the gaseous compound-containing fluid supplied to the fluid suction port of the casing base, and it is possible to eliminate the fear of explosion due to the gaseous compounds floating in the casing base.

The "casing" in the present invention means that the rotor is included in the rotor without rotating or rotating slower than the rotor, and a groove or the like may be provided on the inner surface of the casing.

(Operation) According to the present invention, the adhesion hardening layer formed on the outer peripheral surface of the rotor base and the inner surface of the casing base while supplying the gaseous compound into the casing base is used, and the rotation speed of the rotor base is set to be lower than that during normal operation. Do as a number. Therefore, the temperature of the fluid discharged from the fluid discharge port of the casing base does not rise to a high temperature, and it is possible to eliminate the fear of explosion due to the gaseous compound floating in the casing base and form the adhesion hardening layer.

Furthermore, regarding the fact that the meshing distance between the pair of rotor bases became an appropriate small gap due to the adhesion hardening layer,
When the valve provided on the fluid discharge port side of the circulation circuit that circulates and uses the gaseous compound is closed and the rotor base is set to the rotational speed during steady operation, the pressure provided closer to the fluid discharge port than this valve. It can be easily checked by the ultimate pressure indicated by the gauge.

In a rotary fluid compression / suction machine, generally, the higher the rotational speed of the rotor base, the larger the amount of fluid to be sucked. Therefore, when the gaseous compound is supplied while rotating the rotor base at a high rotational speed as in normal operation, a large amount of the gaseous compound to be supplied to the fluid suction port must be supplied. The generator becomes significantly large.

On the other hand, when a gaseous compound is mixed with a suction fluid such as air and supplied to the fluid suction port, the formation speed of forming the adhered and hardened layer on the rotor substrate or the like becomes remarkably slow, and therefore it cannot be industrially adopted.

In this respect, as in the present invention, by supplying the gaseous compound to the fluid suction port while rotating the rotor base at a lower rotation speed than in the normal operation, the gaseous compound in the suction fluid can be easily made to have a high concentration. It is possible to improve the formation speed of the adhesion hardening layer.

Moreover, in the present invention, the discharge fluid discharged from the fluid discharge port of the casing substrate is circulated to the fluid suction port, and the residual gaseous compound discharged without forming the adhesion hardening layer is circulated and used, so The compound can be effectively used.

(Example) This invention demonstrates in detail about the screw type compressor represented as a rotary fluid compression machine.

FIG. 1 is a partially broken perspective view of a screw type compressor which is an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

Reference numeral 1 denotes a casing, which comprises a cylindrical chamber 8 composed of two intersecting cylindrical walls 2 and 3 having parallel axes and side walls 4 and 5 on both sides of the cylindrical chamber 8. The side wall 5 has a suction side cover 6, and a suction hole 7 is formed in the suction side cover 6. This suction hole 7 is a cylindrical chamber 8
One end is opened, and the discharge hole 9 is provided on the other end side of the cylindrical chamber 8.
Is open.

A male screw rotor 16 having a tooth profile formed by a spiral crest 12 and a spiral trough 14, and a female screw rotor 17 having a tooth profile formed by the spiral crest 13 and a spiral trough 15.
Are arranged in the cylindrical chamber 8 so that they rotate in mesh with each other, and the end rotation shaft of the male screw rotor 16 extends to penetrate / project the casing 1, and the protruding through shaft drives the drive gear 1
8 and 19 are provided. The gear 18 is divided into two pieces so as to minimize the backlash, and the shift in the rotational direction is adjustable.

The male screw rotor 16 passes through the drive gears 18 and 19,
It is driven by a suitable electric motor to drive the female screw rotor 17. The shaft portions of the pair of male and female screw rotors 16 and 17 are rotated to the casing 1 and the suction side cover 6 by an airtight seal member 20 and a bearing 21 which are arranged on the side walls 4 and 5 on both sides so that one side is flush with each other. It is pivotally supported.

The pair of screw rotors 16 and 17 rotate while meshing in the direction of the arrow shown in FIG. The suction gas flows into the space volume of the spiral troughs 14 and 15 communicating with the suction hole 7, and the rotation moves to a compression step where the communication with the suction hole 7 is cut off, and the meshing of the pair of screw rotors progresses. Accompanying valley 14,
The space volume of 15 is reduced, and the gas is compressed and discharged into the discharge hole 9 near the minimum volume.

The male screw rotor 16 and the female screw rotor 17 are made of an alloy material such as steel material, cast iron, aluminum,
It is manufactured by machining, precision casting (lost wax, etc.), rolling, etc.

The bases 16A and 17A of the pair of male and female screw rotors 16 and 17 according to the present embodiment manufactured in this manner are shown by a chain double-dashed line in FIG.

In addition, in FIG. 3, the base body 1A of the casing 1 is also shown by a chain double-dashed line.

As shown in FIG. 3, the screw rotor bases 16A, 17A and the casing base 1A have a meshing clearance between the rotor bases 16A, 17A and the rotor base 16A due to their processing accuracy.
The clearance between A and 17A and the casing base 1A is likely to be larger than an appropriate small gap in which fluid leakage is unlikely to occur.

Moreover, the size of these gaps generally differs depending on the location.

In this respect, in the screw type compressor according to the present embodiment, the adhesion hardening layer is formed on the outer peripheral surfaces of the rotor bases 16A and 17A and the inner side surface of the casing 1A, and the thickness of the adhesion hardening layer is the rotor base 16A. , 17A, and the rotor bases 16A, 17A and the casing base 1A, the rotors 16, 17 and the cylindrical wall 2 having the outer shapes shown by the solid lines 16a, 17a in FIG. A casing 1 having 3 is formed.

As a result, the outer shape of the tooth profile of the rotors 16 and 17 is
It is shaped into an ideal tooth profile curve that allows the meshing gap between 17 to be an appropriate small gap to the extent that an oil film is formed.

Also, the cylindrical walls 2, 3 of the casing 1 are
It is formed in such a shape that the clearance with respect to 17 can be an appropriate small gap to the extent that an oil film is formed.

As the adhesion hardening layer that can be used for the rotors 16 and 17 and the casing 1 having such a shape, rotor bases 16A and 17
A, and that does not corrode the casing base 1A and does not change over time, as long as it has corrosion resistance and thermal stability to the fluid to be handled,
Inorganic substances such as ceramics, polyesters composed of a phthalic acid component and a glycerin component in which molecules are three-dimensionally cross-linked, or organic substances such as polymethylmethacrylate can be mentioned.

Next, a method for manufacturing the screw compressor will be described.

Casing base is a pair of male and female screw rotor bases 16A and 17A manufactured by machining, precision casting, rolling, etc.
This casing 1 is detachably attached to the support plate while being held in 1A.

Next, drive side rotor base (male rotor base 16 in the figure)
By rotating the rotor at a low speed
Rotate 16A and 17A.

Further, a gaseous compound that adheres to the rotor substrates 16A and 17A and the casing substrate 1A to form a hardened layer is supplied into the casing substrate 1A.

Such a gaseous compound does not adhere to the rotor substrate or the like and does not corrode the rotor substrate or the like and does not change with time, and is a curing agent having corrosion resistance and thermal stability against a fluid to be handled. Any material may be used as long as it forms a layer, and examples thereof include a reaction product of phthalic anhydride and glycerin and / or a low molecular weight compound thereof, or a methyl methacrylate monomer.

Such a gaseous compound adheres to the outer peripheral surfaces of the rotor bases 16A and 17A and the inner side surface of the casing base 1A to sequentially stack the hardened layers.

At this time, since the rotor bases 16A and 17A are rotating,
The thickness of the adhesion hardening layer formed on the inner surfaces of the rotor bases 16A, 17A and the casing 1A depends on the meshing gap between the rotor bases 16A, 17A and the size of the clearance between the rotor bases 16A, 17A and the casing 1A. As a result of the change, the meshing gap and the clearance can be formed in an appropriate small gap.

In this way, when the gaseous compound is supplied into the casing base 1A to form the adhesion hardened layer on the outer peripheral surfaces of the rotating rotor bases 16A, 17A and the inner side surface of the casing base 1A, the manufacturing process shown in FIG. It is convenient to use the device.

FIG. 4 is a schematic view of an apparatus for manufacturing the pump 25 which is a screw type compressor.

In order to obtain a gaseous compound that adheres to the rotor bases 16A, 17A and the casing base 1A to form a hardened layer, a liquid or solid compound is made into a gas using a mixed gas generator 22, and a valve 32 and a check valve are provided. It is sent to the pump 25 through 30 and 29 to circulate the circulation circuit 36, and the pump 25 is operated at a low speed according to the flow rate of the gaseous compound. Then, the gaseous compounds are sequentially mixed into a pair of male and female screw rotor substrates 16A, 1
Since it adheres to the outer peripheral surface of 7A and the inner surface of casing base 1A to form a hardened layer, it is circulated for a certain period of time while supplying the gaseous compound.

After that, the pair of rotors of the pump 25 are rotated up to the normal number of revolutions, the valve 27 is closed, and the gas pressure of the pressure gauge 26 is checked. In this case, when an adhesion hardening layer is formed in the gap between the rotor and the casing inside the pump to form a proper gap, the pressure rises to a predetermined pressure. Here, when the pressure does not reach the predetermined pressure, the valve 27 is opened, the pair of rotor rotation speeds are reduced again, and the circulation of the gaseous compound is continued.

Then, after a predetermined period of time, the valve 27 is closed in the same manner as described above, and the pressure of the pressure gauge is checked again.
The finishing process of the pump 25 is completed after further solidifying the adhesion hardening layer formed by operating only 25.

When a hardened layer made of a thermosetting resin is formed on the outer surface of the rotor substrate or the like, the hot air generator 23 is operated to send hot air to the pump 25 to keep the temperature inside the pump and the casing at a high temperature to cure the hot air. It can be promoted and shortened in time.

Here, a specific example of applying the present invention to a screw type compressor will be described.

(Example 1) As a gaseous compound, a reaction product of phthalic anhydride and glycerin and / or a low molecular weight compound thereof, which becomes a polyester in which molecular chains are three-dimensionally crosslinked and cured during polymerization, is used as follows. A screw type compressor was manufactured by the manufacturing apparatus shown in FIG.

The reaction product and / or its low molecular weight compound is made into a gas by using the mixed gas generating device 22, is sent to the pump 25 through the pulp 32, the check valves 30 and 29, and is circulated in the circulation circuit 36. Is operated at low speed according to the gas flow rate (rotor speed is set to about 1/2 of normal speed). Then, the gaseous substances are sequentially replenished and circulated for a certain period of time.

Then, the rotor speed of the pump 25 is raised to the normal speed, the valve 27 is closed, and the gas pressure of the pressure gauge 26 is checked. In this case, when polyester adheres to the space between the rotor and the casing inside the pump and the space becomes appropriate, the pressure rises to about 7 to 14 atm. Here, when the pressure has not reached the above value, the rotor speed is reduced and then the valve 27 is opened to continue the gas circulation again.

Then, after a predetermined time, the valve 27 is closed in the same manner as above, and the gas pressure of the pressure gauge is checked again, and when the predetermined constant pressure is reached, the valve of the gas generator 32 is closed and the valve 27 is opened, and only the pump 25 is operated and adhered. Waiting for the polyester layer to cure, the finishing of the pump 25 is completed.

At this time, the hot air generator 23 is operated to send hot air to the pump 25 to keep the temperature inside the pump and the casing at 80 to 100 ° C.
It is also possible to promote curing and shorten the time.

Further, a large number of = 0 of polyester is firmly adhered to the metal surface to complete a cured layer.

When the pump 25 manufactured in this way was disassembled and the adhesion hardening layer (polyester layer) was inspected, the polyester layer changed its thickness on the outer surface of the rotor base and the inner surface of the casing base. However, the meshing gap between the rotor bases and the clearance between the rotor base and the casing base are both appropriate small gaps.

When the pump 25 was operated, the rotation of the rotor was smooth and the compression ratio was good.

(Example 2) A methacrylic acid resin is used as a hardened layer.

Using a small amount of peroxide catalyst (BPO), polymethylmethacrylate monomer was polymerized into a syrup at 80-100 ° C to a polymerization rate of 10-20% to form a liquid prepolymer, which was prepared in the same manner as in Example 1. The gas is generated by using the gas generator 22, and is sent to the pump 25 through the valve 32 and the check valves 30 and 29 to circulate the circulation circuit 36, and the pump 25 is operated at a low speed. Then, when the monomer adheres to the rotor and casing of the pump 25, the valve 32 is closed and the hot air generator 23 is operated to send hot air into the pump to raise the temperature in the pump to 80 to 100 ° C. After proceeding, the hot air is stopped again to operate the gas generator 22 to circulate the gas. Then, the same operation is repeated several times. During that time, as in Example 1, the rotor speed of the pump 25 was increased to the normal speed, the valve 27 was closed, and the pressure was measured by the pressure gauge 26. When a constant pressure (7 to 14 atmospheres) was reached, gas was generated. The device 22 is stopped and hot air is circulated to complete the polymerization. This constant pressure state indicates the formation of a proper adhesion hardening layer on the inner surface of the pump,
The trouble of disassembling the machine and inspecting the precise finish of the rotor and casing is completely unnecessary.

Further, when the pump 25 was operated, the rotation of the rotor was smooth and the compression ratio was good.

In Example 2, a thermoplastic resin is used, and the adhesion hardening layer is formed by repeating the circulation of gas and the circulation of hot air into the circulation circuit 36.

The screw type compressor has been described above,
The present invention is not limited to screw type compressors, but can be applied to any type of rotary fluid compression machine,
It can be used not only for a gear pump, a helical gear pump, a roots blower, etc., but also for a screw compressor having a single rotor, a trochoid pump, etc.

In a screw compressor, trochond pump, or the like having only one rotor, no meshing gap is formed between the rotor bases, so that the clearance between the rotor base and the casing base is formed in an appropriate small gap.

Further, the present invention can be applied not only to the compression machine but also to the suction machine.

Further, the present invention can be applied to a fluid compression / suction machine in which a pair of rotor bases rotate while being in contact with each other.

(Effects of the Invention) According to the present invention, the meshing gap between rotors and the clearance between the rotor base and the casing base are set by using one or a pair of male and female rotor bases and casing bases manufactured to a certain degree of shape and dimensional accuracy. The proper small gap can be safely and easily made. Therefore, when the compressor or the like is operated, there is no fluid leakage from the meshing gap and the clearance, and the performance of the compressor or the like, especially the compression performance can be significantly improved, and a high pressure ratio can be obtained. .

As described above, according to the present invention, a high-performance rotary fluid compression / suction machine can be easily manufactured with a small number of processing man-hours without requiring a high processing accuracy.

Further, the compressor / suction machine of the present invention can remarkably improve its performance and can reduce the number of rotations of the rotor, so that it is possible to reduce noise and reduce the size and weight of the compression / suction machine. it can.

Furthermore, since the outer peripheral surface of the rotor and the inner surface of the casing are coated with resin, the rotor and the casing have an effect of preventing rust.

Furthermore, even for wear of the meshing part due to the aging of the compressor or the like, the repair for the proper small gap compensation is only the feeding of the gaseous compound, and it is shown in FIG. 4 near the compressor and the like. It can be easily repaired by installing a device or installing a loading facility on a moving vehicle and rushing to the site.

[Brief description of drawings]

FIG. 1 is a partially broken perspective view of a screw type compressor which is an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a rotor base and a casing base. FIG. 4 is an explanatory diagram showing the assembled state, and FIG. 4 is a schematic diagram illustrating the manufacturing apparatus of the present invention. 1 ... Casing, 1A ... Casing base, 2,3 ... Cylindrical wall, 4,5 ... Side wall, 6 ... Suction side cover, 7 ... Suction hole, 8 ... Cylindrical chamber, 9 ... Discharge hole, 12,13 …… Screw rotor crest, 14,15 …… Screw rotor trough, 1
6 …… Male screw rotor, 16A …… Male screw rotor base, 17 …… Female screw rotor, 17A …… Female screw rotor base, 18,19 …… Drive gear, 20 …… Airtight seal, 21 …… Bearing.

Claims (2)

(57) [Claims] 1. When manufacturing a fluid type compression / suction machine in which a rotor is contained in a casing, after assembling parts such as a rotor base constituting the rotor and a casing base constituting the casing, the rotor base is assembled. In order to make the clearance consisting of the gap between the outer peripheral surface of the rotor base body and the inner peripheral surface of the casing base body a proper small gap while rotating in the fluid suction direction at a lower rotation speed than the rotation speed during steady operation. A gaseous compound that adheres to the outer peripheral surface of the rotor base body and the inner peripheral surface of the casing base body to form an adhesion hardened layer is supplied from the fluid suction port of the casing base body and adheres to the outer peripheral surface of the rotor base body and the like. Residual gaseous compound discharged from the fluid discharge port of the casing base is re-supplied to the fluid suction port and circulated for reuse, and the gaseous compound is circulated. On the side of the fluid discharge port of the circulation circuit to be used, a valve provided so that the circulation circuit can be opened and closed is closed, and when the rotor base is set to the rotational speed during steady operation, it is closer to the fluid discharge port than the valve. A rotary fluid compression / suction machine characterized in that an adhering hardened layer is sequentially laminated on the outer peripheral surface of the rotor base and the inner side surface of the casing base until the ultimate pressure indicated by a pressure gauge provided on the rotor reaches a predetermined pressure. Manufacturing method. 2. A supply of a gaseous compound for forming an adhesion hardening layer and a supply of hot air for heating and curing the gaseous compound adhered to the outer peripheral surface of the rotor base and the inner peripheral surface of the casing base to alternate. A method of manufacturing a rotary fluid compression / suction machine according to claim 1, which is performed.