JPH0639797Y2 - Rotor cooling mechanism - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a rotor that is detachable from a rotating body used in a high-speed rotating (impact type) fine pulverizer and a fine powder surface reformer. The present invention relates to a mechanism for cooling a high-speed rotating rotor by providing a circuit for passing a refrigerant inside the rotor and supplying the refrigerant to the rotor using a rotating shaft.

b. Conventional technology The crushing operation is a unit operation in which substances are made small and accompanied by a large heat generation phenomenon due to collision between substances or between a device and a device, friction, agitation of air flow, and the like. Therefore, the inside of the mechanical device or the mechanical device itself (for example, a casing, a cover, a rotor, etc.) is heated to a high temperature, which often causes softening or fusion of the pulverized object, thermal deterioration, and the like. High-speed rotary fine pulverizer and fine powder surface reformer (device) described in the present invention
Since a similar phenomenon occurs in the past, the casing and front and rear covers are conventionally made into a jacket structure and cooled by passing a refrigerant through them, or by direct cooling air blowing, cooling by supplying a cold or warm substance such as dry ice or liquid nitrogen, or Deep-chilling and freeze-grinding, in which the entire processing equipment (process) is contained in a low temperature range, are carried out.

FIG. 4 shows an example of a conventional batch type surface reforming apparatus for fine powder having a rotor, in which 1a and 1b are casings, 2 is a front cover, and 3 is a ring-shaped stator. The space surrounded by these is the impact chamber 4 of the fine powder to be surface-modified, which rotates at high speed (5000
There is a rotor 5 for rotating the rotor 5 to 10,000 rpm), and the rotor 5 is fixed to a rotating shaft 6 by a nut 7.

Reference numeral 12 is a raw material feeding pipe, 14 is a circulation circuit that penetrates a part of the stator 3 through the center of the front cover 2 and communicates with the impact chamber 4, 45 is a raw material feeding port valve, and 46 is a notched portion of the stator 3. On-off valve for discharging modified powder, 47 is the valve shaft of the on-off valve, 48
Is a chute for discharging the modified powder.

The rotation of the motor 8 is transmitted to the rotating shaft 6 by the V belt 9 and the pulleys 10a and 10b, and is transmitted to the rotor 5 via the key 17.

The rotating shaft 6 is supported by bearings 11a and 11b so as to rotate smoothly, and the bearing portion is always lubricated with lubricating oil.

The object to be surface-modified, which is charged from the raw material charging pipe 12, enters the impact chamber 4 through the front cover 2 and is guided to the center of the rotor 5 and the rotary shaft 6, and the rotary shaft 6 of the rotor 5 is centered. Centrifugal force generated by the rotation of the blades 13 radially attached to the blades causes the blades to fly to the outer peripheral portion of the rotor 5, causing impact and shearing force by the blades 13, collision with the ring-shaped stator 3, or collision between powder-processed objects. And, after undergoing a complex interaction such as friction, it self-circulates through the circulation circuit 14. The air volume (volume) generated by the fan effect of the blades 13 is large compared to the total volume of the impact chamber 4 and the circulation circuit 14, and since this large amount of air (or inert gas) circulates in the system, The powder to be processed that circulates along with it is subjected to a huge number of impacts within a single time. And, the powder pair to be treated is reformed to a desired property by receiving a large number of impacts, but in such an apparatus, since the gas and powder in the apparatus are repeatedly circulated in the apparatus, Heat is generated due to friction, impact, compression, etc., and the temperature of the equipment itself such as the rotor, stator, and circulation circuit rises as well as the material to be treated and circulating gas, resulting in softening, fusing,
In many cases, adhesion to the inner wall of the device or thermal deterioration of the processed product occurred.

Therefore, conventionally, as described above, the stator 3 and the circulation circuit 14 are used.
Were made into jacket structures 15 and 16, and a cooling medium was passed through them to cool them. However, cooling of the rotor 5 was structurally impossible. Further, since the device is almost hermetically sealed and operated in batch, it was not possible to directly feed liquid nitrogen or dry ice into the device.

c. Problems to be solved by the invention As described above, in the conventional device, it is not possible to sufficiently cool the inside of the device by the jacket cooling of the casing or the cover or the blowing method of cold air, and the main source of heat is generated. However, it was difficult to effectively cool even the rotor having a large amount of heat storage. In addition, the cooling method by introducing cold air, dry ice, liquid nitrogen, etc. may be expected to have a considerable effect, and although further developed systems such as deep cooling and freeze pulverization have been developed and put into practical use, If all of these are intended for cooling the inside of the device, the cost spent for cooling is enormous (both equipment and operating costs), so the material to be processed is limited to expensive materials in terms of cost. Will be done. Further, as in a fine powder surface reformer (apparatus),
When the treatment object is processed in batch operation in a nearly sealed state,
In some cases, the refrigerant cannot be fed into the device during operation.

It is also conceivable to pass the refrigerant from the outside through the rotary joint through the rotary shaft of the rotating body to cool the rotor, but in this case, when the rotation of the rotor is in the high rotation range (3500 rpm or more), There was a problem with the sealability and it could not be applied.

For the above reasons, there has been no method for inexpensively and expensively cooling a rotor rotating at high speed.

d. Means for Solving Problems The present invention has been made to solve these problems, in which the refrigerant is directly supplied to the rotor part rotating at a high speed,
It is intended to provide a mechanism for directly cooling the rotor. That is, a shaft that rotates at high speed is hollow, and a circular tube that is fixed externally and does not rotate is inserted into the shaft. Further, in a rotor that is mounted on the high-speed rotating shaft and rotates, a coolant passage is provided inside the rotor. Further, by providing a refrigerant inlet / outlet passage at the joint between the hollow shaft and the rotor, and supplying the refrigerant directly to the rotor without using a rotary joint through a non-rotating circular tube inserted in the hollow shaft, the fixed circular tube This is a mechanism that cools the rotor by forming a circuit through which the refrigerant flows in the order of → rotor → hollow shaft.
This cools the rotor that rotates at high speed even during operation, and by using the conventional jacket cooling of the casing and cover together, a more sufficient cooling effect can be obtained, and the object to be processed having a low melting point or softening point (for example, natural wax). , Petroleum wax, synthetic wax and other waxes,
Various polymers such as polyethylene, polystyrene, PVC, polypropylene, etc., fatty acids, stearic acid, etc.), various pharmaceuticals that are prone to heat deterioration, temperature rise during processing of foods, and cooling of the rotating shaft (shaft) Lubricating oil can be cooled at the bearing portion (bearing portion) at the same time.

e. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3 show one embodiment of a batch type surface reforming apparatus for fine powder having a high speed rotating body for explaining the present invention.

In addition, in the figure, regarding the same member of the conventional example,
The same reference numerals are given and the description thereof is omitted.

In the drawing, 106 is a hollow rotating shaft, 105 is a rotor, and a passage for the refrigerant is provided inside the rotor 105,
The rotating shaft 6 and the rotor 5 shown in FIG. 4 have different structures. The rotation of the hollow rotary shaft 106 is
Without using the method of transmitting to the rotor 105 using a key, the collar 18 is fixed to the hollow rotary shaft 106 with the set screw 19, and the set screw 20 is embedded in the collar 18, and in the set hole 21 provided in the rotor 105, By inserting the set screw 20, the rotation of the hollow rotary shaft 106 is transmitted to the rotor 105. Hollow rotating shaft of rotor 105 1
Fixing to 06 is done with nut 7 as in the conventional example.

As shown in FIG. 2, inside the rotor 105, there are a ring-shaped space centered on the rotation axis, and two sets of four spaces orthogonal to the rotation axis and extending radially to the ring-shaped space. It is provided. That is, the ring-shaped space is a circulating water passage 34 for a refrigerant (mainly cooling water), and one set and two of the two sets of four spaces are for circulating the refrigerant supplied through the fixed water supply pipe 22. Waterway 35 to send to 34, the other one
The spaces of the two sets are likewise drainage channels 36 for delivering the refrigerant returning from the circulating water channel 34.

Inside the hollow rotary shaft 106, a pipe for feeding a refrigerant, that is, a cylindrical water supply pipe 22 is inserted, and one end of the water supply pipe 22 has the rotor 10 in the rotor assembly sectional view of FIG.
It extends a little further than the center line (AA) of 5 to the nut side. Further, the other end of the water supply pipe 22 is connected to a coolant supply source (cooling water supply source, etc.), and an adjuster ring
At the position 23, the adjuster ring 23 is fixed while being centered from three directions by a set bolt 24 provided on the adjuster ring 23.

A partition plate 33 having flexibility on the inner surface of the hollow rotary shaft 106 near the end on the nut 7 side and the outer peripheral surface of the water supply pipe 22 is provided on approximately the center line (A-A) of the rotor assembly cross section. It is installed. The partition plate 33 is fixed to the inner surface side of the hollow rotary shaft 106, and is provided so as to maintain a slight gap with respect to the outer peripheral surface of the water supply pipe 22. That is, this partition plate 33
Is for preventing the refrigerant sent from the water supply pipe 22 from being discharged through the chute bath.

Two water supply ports 37 connected to the water supply path 35 of the rotor 105 are provided on the hollow rotating shaft 106 on the nut 7 side with the partition plate 33 as a boundary.
However, on the other side of the partition plate 33, the drainage channel 3 of the rotor 105 is also provided.
Two drain ports 38 connecting to 6 are open.

The refrigerant is a gap between the hollow rotary shaft 106 and the water supply pipe 22 (hereinafter referred to as the drainage channel 3
9)) and is discharged to the outside of the system, but in order to prevent the refrigerant from scattering, the drain flange 26 is provided with a ring-shaped member 40 and a flange that are spaced from the drain flange 26 at a constant interval.
A drainage sump 43 formed by fixing 41 and 41 with a bolt 42 is formed. In the center of the flange 41 forming the drainage puddle 43, there is a hole through which the water supply pipe 22 is inserted, and in the ring-shaped member 40, the refrigerant temporarily retained in the drainage drain 43 is discharged to the outside of the system. A drainage pipe 44 is attached to.

A plurality of rods 27 are fixed to the oil seal holder 25 connected to the casings 101a and 101b with bolts 28, and the drain flanges are attached to the fixed rods 27.
26 is fixed by a nut 29. The hollow rotary shaft 10 is provided between the oil seal holder 25 and the drainage flange 26.
A pulley 10b for transmitting the rotation is arranged on the 6th.

Also, fix the rod 30 to the drainage flange 26 with bolts 31,
The adjuster ring 23 is fixed to the rod 30 with bolts 32.

f. Operation The cooling mechanism of the present invention operates as follows.

First, the rotor 105 is rotated at a high speed, for example, the outer peripheral speed of the rotor is 80 m / s, and a constant flow rate of refrigerant, for example, cooling water is supplied from the water supply pipe 22. The cooling water reaches the circulating water passage 34 from the tip of the water supply pipe 22 through the water supply port 37 opened in the hollow rotary shaft 106, the water supply path 35 in the rotor 105 connected thereto, and cools the rotor 105 from the inside. After that, the cooling water circulates in the circulation water passage 34, while a part of the cooling water flows into the rotor 10.
It flows from the drainage channel 35 in 5 into the drainage channel 39 through the drainage port 38 opened in the hollow rotary shaft 106 connected thereto. The cooling water flowing into the drainage path 39 cools the hollow rotating shaft 106 here, and reaches the drainage pool 43 while cooling the bearing portions (bearing portions) 11a and 11b, the lubricating oil and the like, and is discharged from the drainage pipe 44 to the outside of the system. Is discharged to.

Next, the raw material charging port valve 45 is opened, a certain amount of the object to be processed is supplied into the apparatus through the raw material charging pipe 12, and the raw material charging port valve 45 is closed at the same time when the charging is completed. The object to be processed enters the impact chamber 4 from the front cover 2, is guided to the central portion of the rotor 105, and is rotated by the centrifugal force generated by the rotation of the blade 13 attached to the rotor 105, that is, the airflow generated by the centrifugal force. After passing through the outermost peripheral portion of 105, the stator 3, and the circulation circuit 14, the front cover 2 again returns to the impact chamber 4. By repeating this self-circulation, the blades 13 are modified by being subjected to complex interactions such as impact / shearing force by the blades 13, collision with the stator 3, or friction between the objects to be treated.

After a certain period of time, an opening / closing valve 46 for discharging the reformed powder, which is provided by cutting out a part of the stator, is opened by operating an actuator (not shown) via a valve shaft 47, and the reformed powder is opened. Is discharged and collected by a modified powder collecting device such as a bag filter (not shown).

At this time, if the flow rate of the cooling water is adjusted while measuring the temperature change of the cooling water discharged from the processing chamber 4 and the drainage pipe 44, the surface modification operation can be always performed under the same conditions.

g. Effect When the cooling mechanism of the present invention is used in combination with the cooling structure of the casing and the cover and is installed in a fine pulverizer or a batch type surface reforming device for fine powder, heat generation is usually extremely remarkable and Even under various conditions where the temperature could easily exceed 100 ° C, the temperature could be suppressed to a very low temperature of 60 ° C or less. Therefore, the object to be treated was not softened or fused, and was hardly adhered to the rotor or the stator. Furthermore, by cooling the hollow rotary shaft, the temperature rise of the bearing (bearing) and circulating oil can be suppressed, and the oil cooler that has been provided outside for cooling the rotor is no longer required. There are technical and economic implementation effects.

In addition, by fixing the rotor that rotates at high speed and the hollow rotary bearing through the collar, the inlet and outlet of the refrigerant that is connected to the refrigerant circulation path inside the rotor is installed at the part (joint part) where the rotor is attached to the hollow rotary shaft. It can be provided, and the inside of the hollow rotary shaft can be used as a flow path for the refrigerant.

Further, a partition plate is provided on the inner wall of the hollow rotating shaft and the inner wall of the pipe for feeding the refrigerant inserted in the hollow rotating shaft, and the inlet and outlet of the refrigerant are provided by shifting the partition plate in the axial direction. Since it is placed between the mouth and the mouth, the refrigerant sent from the tip of the refrigerant inlet pipe does not flow into the drainage channel, but flows smoothly into the water outlet, and the refrigerant discharged from the drainage outlet It is discharged smoothly from the drainage channel without flowing to the side.

Also, since the base of the refrigerant feeding tube is fixed while being centered by a plurality of adjuster ring set bolts provided on the frame, the centering of the refrigerant feeding tube with the hollow rotating shaft rotating at high speed is performed. And can be fixed extremely easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a surface reforming apparatus provided with a cooling mechanism according to the present invention, FIG. 2 is a cross-sectional explanatory view near the AA portion of the rotor shown in FIG. 1, and FIG. 3 is FIG. Partly enlarged view of No. 4,
FIG. 1 is a sectional view of a main part of a conventional surface modification device. 1 ... Casing, 2 ... Front cover, 3 ... Stator, 4 ... Impact chamber, 5 ... Rotor, 105 ... Rotor, 6 ... Rotating shaft, 106 ... Hollow rotating shaft, 7 ... Nut, 8 ... Motor, 9 ... V-belt, 10a, 10b ... Pulley, 11a, 11b ... Bearing, 12 ... Raw material feeding pipe, 13 ... Blade 14 ... Circulation circuit, 15, 16 ... Cooling jacket, 17 …… Key, 18 …… Color, 19 …… Set screw, 20 …… Set screw, 21 …… Set hole, 22 …… Water pipe, 23 …… Adjuster ring, 24 …… Set bolt, 25 …… Oil Seal holder, 26 …… Drainage flange, 27 …… Rod, 28,29 …… Bolt, 30 …… Rod, 31,32 …… Bolt, 33 …… Partition plate, 34 …… Circulating water channel, 35 …… Water channel , 36 ... drainage channel, 37 ... water supply port, 38 ... drainage channel, 39 ... drainage channel, 40 ... ring member, 41 ... franc , 42 ...... volts, 43 ...... drainage reservoir, 44 ...... drainage pipes, 45 ...... material inlet valve, 46 ...... off valve, 47 ...... valve shaft, 48 ...... reforming powder discharge chute.

Claims (3)

[Scope of utility model registration request] 1. A mechanism for directly supplying a cooling medium to a rotor by using a hollow rotating shaft to cool the rotor, wherein the rotor is equipped with a cooling medium circulation passage and is removable from the hollow rotating shaft via a collar. A hollow rotating shaft portion fixed to the shaft and abutting on the rotor is provided with a refrigerant inlet and a drain port connected to the refrigerant circulation passage of the rotor, and a refrigerant inlet pipe is inserted into the hollow rotating shaft. At the same time, the cooling mechanism for the rotor is characterized in that a space formed between the pipe for feeding the refrigerant and the hollow rotating shaft is used as a drainage channel for the refrigerant. 2. A partition plate is provided between an inner wall of the hollow rotary shaft and an outer wall of a pipe for feeding the refrigerant which is inserted into the hollow rotary shaft, and the partition plate is provided on the hollow rotary shaft for feeding the refrigerant. The cooling mechanism for a rotor according to claim 1, wherein the cooling mechanism is arranged between the inlet and the drainage port. 3. A utility model registration claim according to claim 1, wherein the base of the pipe for feeding the refrigerant is fixed while being centered by a plurality of set bolts of adjuster rings provided on the frame. The cooling mechanism of the described rotor.