JP2001248581A - Positive displacement fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a necessary part alone. SOLUTION: A positive displacement fluid machine is provided with casings 7, 9 having a rotor chamber 11 and a suction port 13 and a discharge port 15 communicated with the rotor chamber 11, rotors 3, 5 housed in the rotor chamber 11, bearings 49, 51 supporting shafts 23, 25 of the rotors, and seals 55, 57 preventing fluid leakage from the rotor chamber 11. In this positive displacement fluid machine, a cooling means 21 is arranged around the bearing 49 and the seals 55, 57 on the discharge port side 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive displacement fluid machine, for example, a positive displacement fluid machine used for a fuel cell compressor of an electric vehicle.

[0002]

2. Description of the Related Art A supercharger 201 (mechanically driven supercharger) as shown in FIG. 4 is described in Japanese Utility Model Laid-Open Publication No. Hei 4-42284.

The supercharger 201 includes an input pulley 203, an electromagnetic clutch 205, a speed increasing gear set 207,
It comprises a timing gear set 209, a compressor 211 (screw type fluid machine: positive displacement fluid machine), and the like.

[0004] The compressor 211 includes a pair of screw rotors 213 and 215 and a compressor casing 21.
7 and the casing 217 includes
3 and 215, and a rotor chamber 219 and a rotor chamber 21.
9 is provided with a suction port 221 and a discharge port 223 which communicate with each other.

The shafts 225, 22 of the rotors 213, 215
7 is a casing 21 by bearings 229 and 231.
7 is supported.

The rotor chamber 219 and each of the rotors 213 and 215
A suitable gap is provided between the rotors 213 and 215 to prevent mutual interference while minimizing air leakage.

[0007] Speed increasing gear set 207 and timing gear set 20
9 is a gear chamber 235 provided in the gear casing 233.
And is lubricated and cooled by the oil sealed in the gear chamber 235.

The gear casing 233 (the gear chamber 23)
5) is a compressor casing 217 on the discharge port 223 side.
It is connected to.

A seal is provided between each of the shafts 225 and 227 and the casing 217. On the bearing 229 side, intake air leaks from the rotor chamber 219 to the gear chamber 235 and oil leaks from the gear chamber 235 to the rotor chamber 219. In the bearing 231, leakage of intake air from the rotor chamber 219 to the outside and entry of dust and dirt are prevented.

The driving force of the engine is input from the belt 237 to the pulley 203, the speed is increased by the speed increasing gear set 207, the rotors 213 and 215 are rotated via the timing gear set 209, and the compressor 211 is driven.

The driven compressor 211 has a suction port 2
The intake air sucked from the compressor 21 is compressed while moving to the left in the axial direction in FIG. 4 between the rotors 213 and 215 and the rotor chamber 219, and is discharged from the discharge port 223 to supercharge the engine.

[0012]

The screw type fluid machine (compressor 211) is a compression type fluid machine.
In a typical application, for example, the pressure ratio will be about 3.5,
The intake air temperature at the outlet 223 reaches 250 ° C. due to the heat of compression.

[0013] The compression type fluid machine is also used for applications requiring a high pressure ratio, such as a compressor for a fuel cell of an electric vehicle. In the case of this compressor, oxygen of fuel is supplied to the fuel cell. It is driven at high speed by an electric motor to supply a large amount of air at a high pressure ratio.

In such an application, the inside of the supercharger 201, particularly the intake air on the side of the discharge port 223 and its peripheral portion become extremely hot.

Exposure to high temperatures may cause the oil and seal to deteriorate beyond the heat resistance limit, and if the seal deteriorates, leakage of intake air and oil may occur, causing the supercharger 2 to leak.
01 deteriorates and the oil deteriorates, lubrication and cooling become insufficient, and the durability of the supercharger 201 decreases.

In particular, in the supercharger 201, since the gear casing 233 is disposed on the discharge port 223 side of the compressor casing 217, the oil in the gear chamber 235, each gear, bearings and the like are easily affected by the intake air temperature.

When the seal is a labyrinth seal, the gap varies depending on the difference in the thermal expansion coefficient, and the sealing performance may be reduced.

Further, as the temperature rises, the shafts 225, 22
Due to a difference in the coefficient of thermal expansion between the bearing 7 and the casing 217, an excessive force is applied to each of the bearings 229 and 231 and durability is reduced.

When the bearings 229 and 231 deteriorate,
The distance between the axes of the rotors 213 and 215 changes,
3 and 215 and the gap between the rotors 213 and 215 and the rotor chamber 219 deviate from a normal range, and they interfere with each other to cause abnormal wear, which may reduce the durability and performance of the supercharger 201. There is.

Further, in the speed increasing gear set 207 and the timing gear set 209, the backlash between the gears changes due to the thermal expansion, the meshing condition is deteriorated, and gear noise and abnormal wear occur.

In order to prevent these problems caused by a rise in the temperature of the fluid, for example, a seal having high heat resistance and bearings 229 and 231 are used, a member having a small expansion coefficient is used, and a member having high wear resistance is used. , Or a heat countermeasure such as cooling the supercharger 201 is required.

However, measures using heat-resistant members are extremely expensive.

The supercharger 201 is cooled by externally cooling the casing 217 with cooling air or cooling water.

However, in the direction of cooling from the outside in this manner, the casing 217 contracts, and the rotors 213, 21
5, the rotors 213 and 215 and the rotor chamber 21.
9 becomes small, and these interferences become easy.

In the configuration in which the entire casing 217 is cooled from the outside, a large cooling capacity is required, so that the cooling mechanism becomes large and complicated, and the cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a positive displacement type fluid machine that can maintain high performance and durability while being small, light and low in cost by effectively cooling only necessary portions. .

[0027]

According to a first aspect of the present invention, there is provided a positive displacement fluid machine, comprising: a rotor; a casing having a rotor chamber accommodating the rotor; a fluid inlet and a discharge port communicating with the rotor chamber; Bearing to support the shaft of
A seal for preventing fluid leakage from the rotor chamber, wherein when the rotor is rotationally driven, fluid is sucked in from the suction port, moved in the rotor chamber and discharged from the discharge port, and the rotor end face side , A cooling means is arranged around the bearing and the seal.

As described above, the positive displacement fluid machine of the present invention
By arranging the cooling means around the bearings and seals arranged on the end face side of the rotor, only the portions that need to be cooled are partially cooled.

Therefore, in the case of a contact-type seal, deterioration of the seal member is prevented and the durability is improved. In the case of a labyrinth seal, a gap change due to temperature expansion is reduced.
In each case, the sealing performance is kept high, the leakage of fluid and oil is prevented, and the performance of the fluid machine can be kept high.

Further, since the deterioration of the oil is also prevented, each part of the fluid machine is sufficiently lubricated and cooled, so that the performance and the durability are prevented from deteriorating.

Further, since the relative position change between the shaft and the casing due to the temperature expansion is reduced, the bearing is released from an excessive force, and the function and the durability can be kept high.

Therefore, a change in the distance between the shafts of the rotors due to deterioration of the bearings is prevented, and a gap between the rotors and a gap between the rotor and the rotor chamber are normally maintained. Machine durability and performance can be kept high.

Further, the gear connected to the rotor is prevented from undergoing backlash change due to thermal expansion, and is kept in good meshing condition, thereby preventing abnormal wear and gear noise.

In the configuration in which the gear chamber is disposed on the discharge port side, the oil in the gear chamber is protected from the influence of high temperature and is prevented from deteriorating. Therefore, each gear is sufficiently lubricated and cooled, and the durability is improved. I do.

Further, as described above, since necessary portions are sufficiently cooled by the cooling means, it is not necessary to use expensive heat-resistant products or heat-resistant members for seals, bearings, shaft members, casing members and the like. Large cost increases associated with use are avoided.

Further, since the casing is not cooled from the outside, interference between the rotors due to shrinkage of the casing and interference between the rotor and the rotor chamber are prevented, and the durability and performance are further improved.

Further, unlike the conventional example in which the entire casing 217 is cooled, in the present invention in which only the necessary portions are cooled, it is not necessary to particularly increase the cooling capacity. It can be implemented at low cost.

Further, since the adverse effect of the high-temperature fluid is prevented, the positive displacement fluid machine of the present invention has a high pressure ratio at which the fluid on the discharge side has a high temperature, such as a compressor for a fuel cell of an electric vehicle. The range of application can be expanded to applications.

A second aspect of the present invention is the positive displacement fluid machine invention according to the first aspect, wherein the cooling means is arranged adjacent to the rotor. The same operation and effect can be obtained.

Further, since the fluid is cooled by the cooling means disposed adjacent to the rotor, when the positive displacement fluid machine of the present invention is used for a supercharger of a vehicle, for example, an intercooler for cooling intake air is used. It is possible to reduce the size, the supercharging system becomes more compact, and the on-board performance is improved.

According to a third aspect of the present invention, in the first or second aspect, the cooling means comprises a cooling channel and a cooling fluid flowing through the cooling channel. Thus, the same operation and effect as those of the first and second aspects can be obtained.

Further, the cooling means for flowing the cooling fluid through the cooling flow path can concentrate the cooling function in a narrow place, so that only the necessary place can be sufficiently cooled, and only the necessary place can be cooled. Most suitable for the positive displacement fluid machine of the present invention that requires cooling.

Further, since the cooling means having this structure has a simple structure, it can be implemented at low cost.

The cooling fluid is not particularly limited. Therefore,
Common refrigerants such as water, oil, and liquefied gas (for example, chlorofluorocarbon) can be freely selected and used, and the cooling function can be arbitrarily adjusted as needed by selecting the refrigerant.

According to a fourth aspect of the present invention, there is provided the positive displacement fluid machine according to any one of the first to third aspects, wherein the cooling means is arranged on the discharge port side. Actions and effects equivalent to those of the first to third aspects can be obtained.

In a compression type positive displacement fluid machine in which a fluid is heated to a high temperature by compression heat, a particularly large cooling effect can be obtained since a high-temperature discharge fluid is directly cooled by disposing a cooling means on the discharge port side. Thus, the protection effect against high temperatures as described in claims 1 to 3 is further enhanced.

According to a fifth aspect of the present invention, in the positive displacement fluid machine according to the third or fourth aspect, the cooling flow path is provided with an uneven portion for increasing a contact area with the cooling fluid. In this case, the same operation and effect as those of the third or fourth aspect can be obtained.

Further, by providing the concave and convex portions for increasing the contact area with the cooling fluid in the cooling channel, the cooling capacity is greatly improved, and the protection effect against the high temperature as described above is further enhanced.

Further, if this uneven portion is provided on the discharge port side,
The cooling effect of the discharged fluid is particularly high, and when used for a supercharger, the intercooler can be further reduced in size.

In addition to the irregularities, the irregularities may be, for example, corrugated, or may have irregularities in height, irregularities pitch, or irregularities (grooves).
Can be freely selected, and furthermore, these can be combined, and the cooling capacity of the cooling means can be arbitrarily adjusted as needed.

According to a sixth aspect of the present invention, there is provided the positive displacement fluid machine according to any one of the first to fifth aspects, further comprising a pair of screw rotors which rotate while meshing with each other with screw-shaped teeth. This is a screw-type fluid machine that moves fluid in the axial direction between each rotor and the rotor chamber, and the same operations and effects as those of the first to fifth aspects can be obtained.

This screw type fluid machine is a kind of compression type positive displacement type fluid machine, and is frequently used in applications requiring a high pressure ratio. It is suitable for.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor 1 according to an embodiment of the present invention will be described with reference to FIGS.

This compressor 1 has the features of claims 1 to 6. The left and right directions are the left and right directions in FIGS. 1 and 2, and members and the like without reference numerals are not shown.

Compressor 1 (screw type fluid machine:
A positive displacement fluid machine) is used in a fuel cell for an electric vehicle, is driven to rotate at a high speed by an electric motor, and is configured to supply a large amount of air to the fuel cell.

As shown in FIG. 1, the compressor 1 includes a pair of screw rotors 3 and 5, a gear casing 7, a compressor casing 9, a rotor chamber 11, a suction port 13 and a discharge port 15 communicating with the rotor chamber 11, and a timing gear set. 17,
It comprises a joint 19, a cooling means 21 and the like.

The screw rotors 3 and 5 are composed of rotor shafts 23 and 25 and rotor bodies 27 and 29, respectively. Each of the rotor bodies 27 and 29 is rotated by the thrust force of the screw portion 31 so that the large-diameter and small-diameter press-fit portions 33 and 35 form the rotor shaft 2.
Screw-shaped teeth 37 and 39 are formed in the rotor main bodies 27 and 29 so as to mesh with each other.

The gear casing 7 and the compressor casing 9 are fixed to each other. These are accommodated in an outer case 43 attached with bolts 41, and a space between the outer case 43 and each of the casings 7, 9 is filled with a heat insulating material 45.

The rotor chamber 11 is formed between the gear casing 7 and the compressor casing 9, and the rotor bodies 27 and 29 are housed in the rotor chamber 11.

An appropriate gap is provided between the rotor chamber 11 and the rotor main bodies 27 and 29 in order to minimize the leakage of the intake air while preventing the mutual contact therebetween.

The suction port 13 is formed in the axial direction of the compressor casing 9.
Are connected. The discharge port 15 is, as shown in FIGS.
It is formed radially across the gear casing 7 and the compressor casing 9.

The rotor shaft 2 of each screw rotor 3, 5
The left and right ends of the gears 3 and 25 are supported on the gear casing 7 by an angular contact bearing 49, and the right end is supported on the compressor casing 9 by a roller bearing 51.

A gear chamber 53 is provided in the gear casing 7, and an oil reservoir is formed in the gear chamber 53.

Each rotor shaft 23, 25 and the gear casing 7
Between the contact type seal 55 and the labyrinth seal 5
7 prevent air leakage from the rotor chamber 11 to the gear chamber 53 and oil leakage from the gear chamber 53 to the rotor chamber 11.

A labyrinth seal 59 is provided between each of the rotor shafts 23 and 25 and the compressor gear casing 9.
Are arranged to prevent leakage of intake air from the rotor chamber 11 to the outside and entry of dust and dirt.

The timing gear set 17 is housed in a gear chamber 53 and is composed of large-diameter and small-diameter timing gears 61 and 63 meshing with each other.

The large-diameter timing gear 61 is press-fitted into the rotor shaft 23 of the input screw rotor 3, and the small-diameter timing gear 63 is fixed to the other rotor shaft 25 by a taper ring fixing mechanism 65.

The taper ring fixing mechanism 65 locks the timing gear 63 to the rotor shaft 25 and positions it in the rotational direction so that the tooth traces 37 and 39 of the screw rotors 3 and 5 do not contact each other.

The joint 19 connects the output shaft 67 of the electric motor and the rotor shaft 23 on the input side. The joint 19 has two sets of tapered portions 69 for centering both shafts 67 and 23 to prevent misalignment of these shafts and vibration of the compressor 1 due to misalignment.

When the compressor 1 is driven by the electric motor, the screw rotors 3, 5 rotate in the opposite directions via the timing gear set 17 while meshing with each other without contacting the teeth 37, 39. The air sucked from the port 13 is adiabatically compressed while moving to the right in the axial direction between the teeth 37, 39 and the wall surface of the rotor chamber 11, and is discharged from the discharge port 15 to the fuel cell.

At the discharge port 15, the temperature of the adiabatic compressed air is high.

The cooling means 21 includes a water jacket 7
1 (cooling flow path) and cooling water (cooling fluid) flowing through the water jacket 71.

The water jacket 71 is attached to the gear casing 7 (discharge port 15 side: end portions of the rotors 3 and 5).
It is formed so as to surround the angular contact bearing 49, the contact type seal 55 and the labyrinth seal 57.

As shown in FIG. 2, the portion adjacent to the discharge port 15 of the water jacket 71 (the portion of the gear casing 7 forming a semicircular portion of the discharge port 15 having a circular cross section) is provided with the cooling water side. Wavy irregularities 73 and 75 for increasing the contact area are formed on the air side.

The water jacket 71 has a water plug 7 attached to the gear casing 7.
7, 79 and pipes 81, 83 are connected, and a required flow rate of cooling water flows through the water jacket 71 through these flow paths.

The water jacket 71 (the uneven portion 73,
75), the discharge port 15 and the discharge air, the angular contact bearing 49, the contact-type seal 55, the labyrinth seal 57 and the peripheral portion thereof are sufficiently cooled by the cooling water circulating through 75), and are protected from the influence of the high-temperature discharge air. You.

Thus, the compressor 1 is configured.

The cooling function of the water jacket 71 prevents the contact-type seal 55 from deteriorating the seal member and improves the durability, and the labyrinth seal 57 suppresses a small change in the gap due to the temperature expansion. Since the compressor 1 is kept high to prevent air and oil from leaking, the performance of the compressor 1 is kept high.

Further, since the relative position change between the rotor shafts 23, 25 and the casings 7, 9 is suppressed to a small extent by suppressing the temperature expansion to a small extent, the angular contact bearing 49 does not receive an excessive force. Degradation is prevented, and the function and durability are kept high.

Accordingly, a change in the center distance of the rotors 3, 5 (rotor shafts 23, 25) due to the deterioration of the bearing 49 is prevented, and the gap between the rotor bodies 27, 29 (tooth traces 37, 39) and the rotor 3, 5 Since the gap between the rotor chambers 11 is maintained at a normal value, these interferences and abnormal wear are prevented, and the compressor 1 is maintained with high performance and durability.

Since the water jacket 71 is adjacent to the gear chamber 53, the oil in the oil pool, the timing gear set 17 and the like are also cooled, and are protected from the influence of high-temperature discharge air.

As described above, since the deterioration of the oil is prevented, the meshing portions of the timing gears 61 and 63 are sufficiently lubricated and cooled, and the durability is improved.

Further, since the timing gears 61 and 63 are prevented from changing the backlash due to thermal expansion, the meshing state is favorably maintained, abnormal wear and gear noise are prevented, and the durability is further improved.

Further, by arranging the cooling means 21 on the side of the discharge port 15 where the air is compressed to a high temperature, a remarkable cooling effect is obtained, so that the protection effect against the high temperature as described above is extremely large.

Further, by providing the uneven portions 73 and 75 in the water jacket 71 and the discharge port 15 thereof, the contact area between the cooling water and the discharge air increases, and the cooling function is greatly improved. The protection effect is further improved.

The uneven portions 73 and 75 have the height of the unevenness,
It is possible to freely select the pitch of the unevenness or the pattern in which the unevenness (groove) intersects, and furthermore, it is also possible to combine these, so that the cooling capacity of the cooling means 21 can be optionally set as required. Can be adjusted.

Further, since only the necessary portions are cooled and the entire casings 7, 9 are not cooled, the rotors 3, 5 (the teeth 37, 3) due to the contraction of the casings 7, 9 are formed.
The interference of 9) and the interference between the teeth 37 and 39 and the rotor chamber 11 are prevented, and the durability and performance of the compressor 1 are further improved.

The cooling means 21 for flowing the cooling water through the water jacket 71 has a simple structure, is low in cost, and can concentrate the cooling function in a narrow place, so that a high cooling effect can be obtained. Therefore, only the necessary portions can be sufficiently cooled as described above.

Further, unlike the conventional example in which the entire casing 217 is cooled from the outside, it is not necessary to particularly increase the cooling capacity. Therefore, a sufficient cooling capacity can be obtained with the small-sized water jacket 71, and the cost can be reduced. be able to.

Further, since a sufficient cooling effect can be obtained by the cooling means 21, it is not necessary to use expensive heat-resistant products or heat-resistant members for the seal, bearing, shaft member, casing member and the like, and a large increase in cost can be avoided.

Since the high-temperature air is cooled by the cooling means 21 arranged close to the rotors 3, 5,
When the compressor 1 is used, for example, in a supercharger of a vehicle, the size of the intercooler for cooling the intake air can be reduced, so that the supercharging system can be made more compact and the on-board characteristics can be improved.

The uneven portion 7 provided at the discharge port 15
Since the cooling effect of the discharge air is particularly enhanced by 3,75, the effect of reducing the size of the intercooler when used in a supercharger is further improved.

Further, as described above, a sufficient cooling effect can be obtained by the cooling means 21. Therefore, the positive displacement fluid machine (compressor 1) of the present invention has a discharge side like a fuel cell for an electric vehicle. The range of application can be extended to applications where the fluid temperature is high and the pressure ratio is high.

The displacement type fluid machine of the present invention is not limited to a screw type fluid machine, but may be, for example, a roots type fluid machine,
A scroll type fluid machine, a rotary type fluid machine, a vane type fluid machine, etc. may be used.

Further, a screw type in which the fluid has a high temperature,
Particularly high effects can be obtained with each of the scroll-type, rotary-type, and vane-type compression-type fluid machines.

Further, as described in claim 3, as the cooling fluid, a general refrigerant such as water, oil, liquefied gas (for example, chlorofluorocarbon) can be freely selected and used.
By selecting these refrigerants, the cooling function can be arbitrarily adjusted as needed.

[0097]

According to the positive displacement fluid machine of the first aspect, only the necessary parts are sufficiently cooled, the performance and durability of the seal and bearing are normally maintained, and the performance and durability are maintained high. It is.

Further, the gear is prevented from undergoing backlash change, is kept in a good meshing state, and abnormal wear and gear noise are prevented.

In the configuration in which the gear chamber is arranged on the discharge port side, deterioration of oil is prevented, the gear is sufficiently lubricated and cooled, and durability is improved.

Further, it is not necessary to use expensive heat-resistant products or heat-resistant members for the seal, the bearing, the shaft member, the casing member, and the like, so that a large cost increase can be avoided.

Since the entire casing is not cooled,
Interference between the rotors due to shrinkage of the casing and between the rotor and the rotor chamber are prevented, and the durability and performance are further improved.

Further, since there is no need to particularly increase the cooling capacity, the cooling means is simpler in structure, more compact, and can be implemented at lower cost.

Further, the positive displacement fluid machine of the present invention, which can provide a sufficient cooling effect at a necessary place, has a pressure ratio of a fluid temperature on the discharge side which is high, such as a compressor for a fuel cell of an electric vehicle. Applicable to high applications.

According to the positive displacement fluid machine of the second aspect, the same effect as that of the first aspect can be obtained.

Further, since the fluid is cooled by the cooling means arranged adjacent to the rotor, when used in a vehicle supercharger, the size of the intercooler is reduced accordingly, the supercharging system is made compact, and the mountability is improved. I do.

The positive displacement fluid machine according to the third aspect can provide the same effects as those of the first or second aspect.

The cooling means composed of the cooling passage and the cooling fluid has a simple structure, is low in cost, and has a high cooling effect in a narrow place, so that only the necessary places are sufficiently cooled. Most suitable for the positive displacement fluid machine of the present invention.

Further, a general refrigerant can be freely selected and used as the cooling fluid, and the cooling function can be adjusted as required by selecting the refrigerant.

The positive displacement fluid machine according to the fourth aspect can provide the same effects as those of the first to third aspects.

Further, a large cooling effect is obtained by the cooling means arranged on the discharge port side where the temperature of the fluid becomes high, and the protection effect against high temperatures is further enhanced.

The positive displacement type fluid machine according to the fifth aspect can provide the same effects as those of the third or fourth aspect.

Further, the cooling function is greatly improved by the concave and convex portions provided in the cooling channel, and the effect of protecting against high temperatures is further enhanced.

Further, when the uneven portion is provided at the discharge port, the effect of cooling the discharged fluid is particularly enhanced, and when used for a supercharger, the size of the intercooler can be further reduced.

The cooling capacity of the cooling means can be arbitrarily adjusted by freely selecting the mode of the uneven portion.

The positive displacement fluid machine according to the sixth aspect can provide the same effects as those of the first to fifth aspects.

A screw type fluid machine, which is a kind of compression type positive displacement type fluid machine, is frequently used in applications requiring a high pressure ratio. Suitable for machines.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor (screw type fluid machine: positive displacement type fluid machine) 3,5 Screw rotor (rotor) 7 Gear casing (casing) 9 Compressor casing (casing) 11 Rotor chamber 13 Suction port 15 Discharge port 21 Cooling means 23,25 Rotor shaft 49 Angular contact bearing (Bearing) 55 Contact type seal (Seal) 57 Labyrinth seal (Seal) 71 Water jacket (Cooling channel) 73, 75 Wavy irregularities

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hikaru Hasegawa 2388 Omiyacho, Tochigi City, Tochigi Prefecture Tochigi Fuji Industrial Co., Ltd. F-term (reference) 3H029 AA03 AA18 AB02 BB12 CC48

Claims (6)

[Claims] A rotor, a rotor chamber accommodating the rotor, a casing having a suction port and a discharge port of a fluid communicating with the rotor chamber, a bearing for supporting a shaft of the rotor, and preventing leakage of fluid from the rotor chamber. When the rotor is driven to rotate, fluid is sucked in from the suction port, moved in the rotor chamber, and discharged from the discharge port, and cooled around bearings and seals on the rotor end face side. A positive displacement fluid machine characterized by disposing means. 2. The positive displacement fluid machine according to claim 1, wherein the cooling means is arranged adjacent to the rotor. 3. The positive displacement fluid machine according to claim 1, wherein the cooling means comprises a cooling flow path and a cooling fluid flowing through the cooling flow path. 4. The positive displacement fluid machine according to claim 1, wherein the cooling means is disposed on a discharge port side. 5. The positive displacement fluid machine according to claim 3, wherein the cooling flow path is provided with an uneven portion for increasing a contact area with the cooling fluid. 6. The invention according to claim 1, further comprising a pair of screw rotors that rotate while meshing with each other with screw-shaped teeth, wherein fluid flows between each rotor and the rotor chamber. A positive displacement fluid machine, which is a screw fluid machine that moves in the axial direction between the fluid machines.