JPH02277994A - Oil free screw type pump device - Google Patents

Abstract

PURPOSE:To prevent motor burning accidents by extending a shaft of a driving gear of an accelerator, by overhanging it in the cantilever state only with a bearing of a gear part to make it a motor shaft, and by providing a bypass flow passage which directly connects an inlet part to an outlet part of an oil cooler or an aftercooler so as to enable easy handling and simple structure. CONSTITUTION:One male rotor of a screw rotor 1 is formed so that it is driven by a motor 6 through an accelerator 5 in which a small gear 3 and a large gear 4 are combined. A shaft 13 of the large gear 4 to be engaged with the small gear 3 is supported by bearings 14 and 15, and by supporting this shaft by overhanging it exceeding the bearing 15 and by making this overhung part support a motor rotor 16 in the cantilever state, a bearing of a shaft 13 as a motor shaft is eliminated and disassembly of the motor 6 is facilitated. And by providing a cooling water flow passage 28 having a bypass flow passage 27 which directly connects an inlet part to an outlet part of a water-cooling part of an oil cooler 24, enough cooling water can be supplied to a water-cooling jacket of the motor through the bypass flow passage and burning accidents of the motor can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oil-free screw type pump device that does not inject 411 into the rotor chamber.

(Prior Art) Conventionally, there is a screw type pump body in which a pair of male and female screw rotors that mesh with each other are rotatably housed, and one of the screw rotors of the pump body is driven by a motor via a speed increasing means that is a combination of large and small gears. A pump device is known (Japanese Unexamined Patent Publication No. 54-42008, USP 476728).
Publication No. 4). In these devices, the motor arm of the -F motor is supported by bearings on both sides of the rotor.

On the other hand, as an oil-free screw type pump device using a water-cooled motor, one equipped with a cooling water flow path as shown in FIG. 6 is known. That is, after starting from the cooling water inlet and branching into two flow paths, one flow path passes through the pump body and the water cooling section of the aftercooler, and the other flow path passes through the ura cooler and the water cooling section of the water cooled motor. Both flow paths merge and reach the cooling water outlet.

(Problems to be Solved by the Invention) In the above-mentioned screw type pump device, the motor shaft has a RI'W construction in which both sides are supported by bearings. For this reason, there is a problem that the disassembly and reassembly work during maintenance and inspection of the motor section becomes complicated.

Another problem is that the more bearing parts there are, the more complex the lubrication system becomes.

Furthermore, if the gear shaft and the motor shaft are separate pieces, there is a problem in that centering work is required and assembly is time-consuming.

On the other hand, as shown in Figure 6, in a device equipped with a cooling water flow path from the water cooling part of the oil cooler to the water cooling part of the motor, if the quality of the cooling water is poor, for example, if it contains mud, etc. The problem with this is that it contaminates the inside of the pipe in the flow path, worsening the heat transfer coefficient, and if this worsens or progresses, the pipe becomes clogged, resulting in insufficient cooling of the motor, which can lead to burnout of the motor. be.

The present invention has been made to address the above-mentioned conventional problems, and is an oil-free screw pump device that is easy to handle during maintenance and inspection, has a simple structure, and prevents motor burnout accidents. This is what we are trying to provide.

(Means for Solving the Problems) In order to solve the above problems, a first invention provides a water-cooled pump main body rotatably housing a pair of male and female screw rotors that mesh with each other. In an oil-free screw type pump device configured to be driven by a motor via a combined speed increasing means, the shaft of the drive side gear of the speed increasing means is extended, and only by the bearing of the gear portion. The U was extended in a supported cantilevered state, and this extended portion was formed as the motor shaft of the motor.

Further, in a second aspect of the present invention, a discharge passage provided with a water-cooled aftercooler continues on the discharge port side of the pump body, and a water-cooled An oil circulation flow path equipped with a Shikiura cooler passes through the motor, the motor is water-cooled, a cooling water flow path passes through the oil cooler or the aftercooler, and passes through the water-cooled part of the motor, and the above /lJ] A bypass flow path that directly connects the inlet and outlet of the water cooling section of the cooler or aftercooler is formed in any way.

(Function) With the above configuration, in the first invention, the motor shaft is supported in a cantilevered state by the bearing of the gear part, and the coupling between the bearing of the motor shaft and the gear shaft and the motor shaft is no longer necessary, and the motor rotor can be assembled by simply attaching the motor rotor to the gear shaft.

Furthermore, in the second aspect of the invention, even if the water cooling section on the upstream side of the water cooling section of the motor becomes clogged, sufficient cooling water can be sent to the water cooling section of the motor through the bypass passage.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

. FIG. 1 shows an oil tree fluff according to the first invention.

A water-cooled pump body 2 rotatably houses a pair of male and female screw rotors l that engage with each other.
One male rotor of the screw rotor 1 is connected to a small gear 3.
It is configured to be driven by a motor 6 via a speed increasing means 5 combined with a large south car 4.

More specifically, the male and female screw rotors l are housed in a rotor chamber with one open to the suction lower and the other open to the discharge port 8, and are attached to the respective rotor shaft ends and engaged with each other.
In addition, a small gear 3 is attached to the shaft end of the male rotor on the opposite side from the synchronous gear 9.

Further, a water cooling jacket 10 for cooling the screw rotor 1 portion is provided in the pump body 2, and an aftercooler I2 is provided in the discharge passage 11 following the discharge port 8. The shaft 13 of the large float 4 that meshes with the small gear 3 is supported by bearings 14 and 15 on both sides of the large gear 4, and is further extended beyond the right side (') f+h bearing 15 in FIG. The motor rotor 16 is supported in a cantilevered manner by this overhang.

Further, the casing I7 of the motor 6 is composed of an outer casing 18 and an inner casing I9, and a water cooling jacket 20 is provided between the two, and a motor stator 21 is attached to the inner casing 19.

Furthermore, the lower part of the speed increasing means 5 is an oil reservoir part 22, from which the ura pump 23. Through the oil cooler 24, the synchronous gear 9 inside the pump body 2. Pass through lubrication points such as bearings,
An oil circulation channel 25 is provided which returns to the oil reservoir 22 again.

Then, the screw rotor l is rotated by the motor 6 via the speed increasing means 5, and the gas sucked in from the suction lower is compressed and discharged from the discharge port 8 to the discharge passage 11, and the discharged gas is cooled by the aftercooler 12. It is designed to do this. Also, the oil reservoir section 22 is connected to the oil pump 23. oil cooler 2
4 to the synchronous gear 9 in the pump body 2. It passes through oil supply points such as bearings and returns to the oil reservoir 22 for circulation.

Furthermore, by configuring as described above, the bearing at the right end in FIG. 1 of the sleeve 13 as the motor shaft is eliminated,
It makes it easy to disassemble the motor 6 and eliminates the need for oiling the bearings.
This makes it easy to change the motor core length and easily increase the capacity of the device.

2 and 3 show an oil-free screw type pump device according to a first embodiment of the second invention, and the device shown in FIG. 1 is different from the device shown in FIG. 1 except that a cooling water flow path is newly shown. Portions that are substantially the same and correspond to each other are designated by the same numbers and will not be described further.

That is, in this embodiment, the water cooling jacket 10. of the pump main body 2 is connected from the cooling water inlet. The cooling water passage 26 passes through the water cooling section of the aftercooler 12 to the cooling water outlet, and the cooling water flows from the above cooling water section through the water cooling section of the oil cooler 24 and the water cooling jacket 20 of the motor 6 to the cooling water outlet. A cooling water flow path 28 including a bypass flow path 27 that directly connects the water cooling channel inlet and outlet of the cooler 24 is provided.

Even if the pipe of the water cooling part of the oil cooler 24 becomes clogged and the flow of water in the pipe decreases, the bypass passage 27 can supply sufficient water to the water cooling jacket 20 of the motor 6. be.

4 and 5 show an oil-free screw pump device according to a second embodiment of the second invention, and are substantially the same as FIGS. 2 and 3 except for the cooling water flow path. Corresponding parts are given the same numbers and their explanation will be omitted.

That is, in this embodiment, the water cooling jacket 10. of the pump main body 2 is connected from the cooling water inlet. A cooling water passage 29 that passes through the water cooling section of the oil cooler 24 and reaches the cooling water outlet, and a water cooling section of the aftercooler 12 from the cooling water inlet to the water cooling jacket of the motor 6! A cooling water flow path 31 is provided, which includes a bypass flow path 31 that passes through 0 to reach the cooling water outlet and directly connects the inlet and outlet of the water cooling section of the aftercooler 12.

Similarly to the above, even if the pipe of the water cooling section of the aftercooler 12 becomes clogged and the flow of water in the pipe decreases, sufficient water can be supplied to the water cooling jacket IO of the motor 6 through the bypass passage 30. be.

In the above embodiment, the oil cooler 24. The cooling water flow path provided with the bypass flow path 27, 30 of the water cooling portion of the aftercooler 12 is not limited to the pump body 2, but can be applied to oil-free screw pump devices in general.

(Effects of the Invention) As is clear from the above description, according to the first invention, the shaft of the drive side gear of the speed increasing means is extended and extended in a cantilevered state supported only by the bearing of the gear part. This projecting portion is then formed as a motor shaft of the motor.

Therefore, the motor part can be easily disassembled, maintenance and inspection can be easily performed, and the number of couplings between the bearing part, the motor shaft and the gear shaft can be reduced, and this reduction simplifies the lubrication system. This reduces the burden of periodic lubrication work, eliminates the need for centering the motor shaft and gear shaft, and makes it possible to increase the capacity of the device by changing the length of the motor core.

Further, according to the second invention, a discharge flow path equipped with a water-cooled aftercooler continues on the discharge port side of the pump body, and oil supply points in the pump body, such as the screw rotor bearing and the shaft seal, are water-cooled. The motor is water-cooled, and the cooling water flow path passes through the above-mentioned cooler or the after-cooler and passes through the water-cooled part of the motor,
In addition, it is formed to have a bypass passage that directly connects the inlet and outlet of the above-mentioned cooler or aftercooler.

Therefore, even if the inside of the pipe of the water cooling part of the oil cooler 5 aftercooler becomes dirty or clogged if the quality of the cooling water is poor and sufficient maintenance and inspection is not performed, the bypass flow path will provide enough water for the water cooling jacket of the motor. This has the effect of supplying coolant water and preventing motor burnout.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of the device according to the first invention, FIG. 2 is an overall configuration diagram of the device according to the first embodiment of the second invention, and FIG. 3 is a cooling water system diagram of the device shown in FIG. 2. , FIG. 4 is an overall configuration diagram of a device according to a second embodiment of the second invention, FIG. 5 is a cooling water system diagram of the device shown in FIG. 4, and FIG. 6 is a cooling water system diagram of a conventional device. It is. ! ...Screw rotor, 2...Pump body, 3...
Small gear, 4...Large gear, 5...Speed-up means, 6...Motor, butt...Discharge port, 11...Discharge flow path, 12...Aftercooler, 13...Shaft, 14. 15...Bearing, 24
... Ura cooler, 25 ... Oil circulation flow path, 26, 28, 2
9.31 Cooling water flow path, 27.30... Bypass flow path. Patent applicant: Agent of Kobe Steel, Ltd.
Patent attorney Aohaku Ao and 1 other person Figure 1 + 1 Figure 2 Figure 63 Z/ Figure 3

Claims (2)

[Claims] (1) A water-cooled pump body rotatably housing a pair of male and female screw rotors that mesh with each other, and an oil-free pump body in which one of the screw rotors is driven by a motor via a speed increasing means that combines large and small gears. In the screw type pump device, the shaft of the driving gear of the speed increasing means is extended and extended in a cantilevered state supported only by the bearing of the gear portion, and this extended portion is connected to the motor shaft of the motor. An oil-free screw type pump device that is characterized by: (2) A discharge passage equipped with a water-cooled aftercooler continues on the discharge port side of the pump body, and a water-cooled oil cooler is installed at oil supply points in the pump body such as the screw rotor bearing and shaft seal. The motor is water-cooled, and the cooling water flow path passes through the oil cooler or the aftercooler and then through the water cooling section of the motor, and the motor is water-cooled. 2. The oil-free screw pump device according to claim 1, further comprising a bypass passage that directly connects an inlet portion and an outlet portion of the oil-free screw pump device.