JPH07103171A - Refrigeration compressor - Google Patents

Abstract

PURPOSE:To secure a theoretical oil feed quantity as well as to eliminate a shortage of feed oil by preventing a reduction in the actual oil feeding quantity from occurring even at a time when pressure in a refrigerant goes down, in time of this refrigerant being largely melted into oil as reducing any supercharging oil at the time of steady operation without varying the theoretical oil feed quantity of a displacement type lubricating pump. CONSTITUTION:A pressurizer, consisting of, for example, an oil absorbent cylinder 20 and a spiral oil groove 22, a screw blade, a divider or the like, and pressurizing suction oil flowing in a inlet passage 11d, is installed in this inlet passage 11d of a displacement type lubricating oil 10, and any possible foaming in a refrigerant being melt in oil is reduced, thereby securing the actual oil feeding quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a refrigerant compressor, more specifically,
The present invention relates to a refrigerant compressor provided with a positive displacement oil supply pump, and by driving the pump, oil in an oil sump provided at the bottom of a casing is supplied to oil absorption points.

[0002]

2. Description of the Related Art Conventionally, an oil sump is provided at the bottom of a casing containing a compression element, and a displacement type oil supply pump is provided on a drive shaft for driving the compression element, and the oil in the oil sump is driven by the pump. A refrigerant compressor adapted to refuel oil at a refueling location is known, for example, as disclosed in Japanese Patent Laid-Open No. 64-3280.

The positive displacement oil supply pump used in this refrigerant compressor has a drive shaft A of a compression element as shown in FIG.
A pump housing C fixedly supported by a lower bearing B that supports the pump housing C, and a yoke E having an oval pump chamber D and reciprocally supported only in the minor axis direction by the pump housing C.
A cylindrical rotor G fixed to the lower end of the drive shaft A via a connecting cylinder F and eccentrically rotated in the pump chamber D of the yoke E; and the yoke E on the lower surface side of the rotor G. And a closing plate H that closes the pump chamber D by receiving the oil. An oil suction hole J and the rotor G provided in the closing plate H by the rotation of the rotor G accompanying the driving rotation of the drive shaft A. The lubricating oil in the oil sump is sucked into the pump chamber D from the suction port K through the suction passage L and is pressurized by the progress of the rotation of the rotor G, and is discharged from the discharge port M through the discharge passage N to the drive shaft A. The oil is supplied to the oil supply passage P. [Detailed Description of the Invention]

When the positive displacement oil pump having the above-mentioned structure is used, a constant volume oil supply operation can be performed in which a predetermined amount of oil can be obtained according to the rotation speed of the drive shaft A.
When the low-pressure refrigerant sucked into the compressor casing is highly melted into the lubricating oil and the low-pressure pressure (suction pressure) of this refrigerant is reduced, the melted refrigerant is foamed due to the suction pressure loss on the suction side of the pump chamber D. Therefore, there is a problem that the oil absorption amount is reduced and the actual oil supply amount is reduced.

That is, the suction side inlet of the pump chamber D is narrow, and a constant pressure loss occurs due to the resistance when passing through this inlet. Therefore, as shown in FIG. When the pressure P of the refrigerant is low, the amount of increase in the volume V of the melted refrigerant due to the pressure loss is larger than the amount of increase in the volume of the refrigerant when the pressure P is high. In other words, since the amount of foaming increases, the amount of oil absorbed into the pump chamber D decreases, and the actual amount of oil supplied decreases, resulting in insufficient oil supply to the oil supply location.

To solve this problem, it is conceivable to increase the volume of the pump chamber and increase the theoretical oil supply amount of the pump, but the pressure of the refrigerant (low pressure) is operated at a predetermined pressure or higher. The amount of lubrication becomes excessive during steady operation,
There is a problem that the amount of oil mixed in the discharge gas refrigerant increases, the refrigerating capacity decreases, and at the predetermined filling amount of lubricating oil, on the contrary, there is a problem that the oil rises, and There is no solution.

It is an object of the present invention to prevent the excessive lubrication during steady operation without changing the theoretical amount of lubrication, and when the refrigerant is highly melted into the oil and the low pressure of the refrigerant is reduced, This is to prevent the amount of refueling from decreasing and to ensure a predetermined theoretical amount of refueling.

[0008]

In order to achieve the above object, the invention according to claim 1 has a compression element 2 installed in an upper portion of a casing 1 having an opening of a refrigerant suction pipe 1b and an oil sump 7 provided in a lower portion thereof. Together with a drive shaft 4 for driving the compression element 2.
In the refrigerant compressor provided with the positive displacement oil supply pump 10 opening to the oil sump 7, the pressurizing device for pressurizing the suction oil flowing through the intake passage 11d is provided in the intake passage 11d of the oil supply pump 10. .

According to the second aspect of the invention, the rotary body 11 of the positive displacement oil supply pump 10 is provided with an oil absorbing cylinder 20 having an oil absorbing passage 21 communicating with the suction passage 11d of the rotary body 11, and the oil absorbing cylinder 20 is provided. The spiral oil groove 22 for pressurizing the suction oil by the rotation of the oil absorbing cylinder 20 is provided in the cylinder 20.
According to the invention described in the above, the oil absorption cylinder 20 is provided with a screw blade 23 for pressurizing the suction oil by the rotation of the oil absorption cylinder 20, and the invention described in claim 4 is provided at the tip of the oil absorption cylinder 20. A divider 24 that acts as a centrifugal pump is installed, and the invention according to claim 5 is the oil absorbing cylinder 2
The throttling portion 25 capable of centrifugal pressurization is provided on the tip side of 0.

According to a sixth aspect of the present invention, the rotary body 11 of the positive displacement oil supply pump 10 is provided with an oil absorbing cylinder 20 having an oil absorbing passage 21 communicating with the suction passage 11d of the rotary body 11, and the oil absorbing cylinder 20 is provided. A discharge oil passage 27 that extends radially in the cylinder 20.
While installing the impeller 27 with a,
7, a pressurizing passage 28b communicating with the oil suction port 28a opening to the low pressure side of the discharge oil passage 27a and the discharge side of the discharge passage 27a and communicating with the oil suction passage 21 of the oil suction cylinder 20 is provided. The pressure case 28 is provided.

Further, in the invention according to claim 7, the positive displacement oil supply pump 10 is of a trochoid type, and the rotary body 31 of the pump 10 has an oil absorption protruding from the pump case 33 toward the oil sump 7. The oil suction cylinder 40 having the passage 41 is provided, and the oil suction passage 41 of the oil suction cylinder 40 is provided with the centrifugal pressurizing passage 42 that opens radially toward the suction chamber 36 of the pump casing 33.

[0012]

According to the first aspect of the invention, since the suction passage 11d of the pump 10 is provided with the pressurizing device for pressurizing the suction oil flowing through the suction passage 11d, the theoretical oil supply amount of the pump 10 can be increased. , It is possible to increase the suction pressure when the oil is sucked into the pump chamber, and suppress the foaming of the melted refrigerant. Therefore, even when the refrigerant melts into the lubricating oil to a large extent and the low pressure of the refrigerant decreases, the theoretical oil supply Quantity can be secured, and since the theoretical oil supply amount is not increased,
During steady operation, there will be no over-refueling and no problems due to over-refueling will occur.

Further, according to the second aspect of the present invention, since the spiral oil groove 22 is provided in the oil absorption cylinder 20, the suction pressure of the oil absorbed can be increased with a simple structure without increasing the number of parts. .

Further, according to the third aspect of the present invention, since the oil absorption cylinder 20 is provided with the screw blades 23, the pressurizing performance of the suction pressure can be increased and the foaming of the melted refrigerant can be further suppressed.

Further, according to the invention as set forth in claim 4, since the divider 24 is internally provided at the tip end portion of the oil absorbing cylinder 20, an existing product is used, and it is possible to suppress an increase in cost. In the invention, since the throttle portion 25 is provided on the tip end side of the oil absorbing cylinder 20, the oil absorbing cylinder 20 can be configured by simple processing without increasing the number of parts.
Refrigerant bubbling can be suppressed with a minimum cost increase by only providing 0.

In the invention according to claim 6, the impeller 27 and the pressure case 28 are provided, and the impeller 27 is provided.
By the centrifugal pump action by the rotation of the pressurizing case 28 to pressurize in the pressurizing passage 28b of the pressurizing case 28 and discharge the oil to the oil absorption cylinder 20, a sufficient increase in the suction pressure of oil is ensured while suppressing the vertical height. Therefore, the refrigerant bubbling can be reduced more effectively.

Further, in the seventh aspect of the present invention, the positive displacement oil supply pump 10 is of a trochoid type, and the oil absorption cylinder 40 is provided on the rotating body 31 which rotates together with the inner rotor 34, and the oil absorption cylinder 40 is centrifugally pressurized. Since the passage 42 is provided, the pump drive can be checked from the outside while using the trochoidal pump, and the spiral oil groove can be processed,
Even if components such as a screw blade and a divider are not added, the oil to be absorbed can be sufficiently pressurized with a simple structure in which the centrifugal pressure passage 42 is provided.
By providing a spiral oil groove, a screw blade, a divider, or the like, two-stage pressurization is possible, and refrigerant bubbling can be reduced more effectively.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The refrigerant compressor shown in FIG. 2 is a scroll compressor, and a compression element 2 consisting of a fixed screw and a movable screw below the inside of a closed casing 1 provided with an oil sump 7 at the bottom.
Further, an upper bearing housing 3 and a motor 5 having a drive shaft 4 are respectively arranged below them, and a partitioned discharge chamber is provided above the compression element 2 to provide a refrigerant discharge pipe. 1a is opened, and a refrigerant suction pipe 1b is opened below the compression element 2 to form a low-pressure dome inside the casing 1, while a lower bearing housing 6 is arranged below the motor 5. Supporting the lower end side of the drive shaft 4,
Furthermore, a positive displacement oil supply pump 10 that opens into the oil sump 7 is provided at the lower end of the drive shaft 4, and the pump 10 drives the pump 10 to drive an oil sump 7 in an oil supply passage 8 provided in the drive shaft 4. It is designed to pump oil and supply it to each lubrication point.

Further, the positive displacement oil supply pump 10 is a yoke type pump, and is a rotating body 11 which rotates together with the drive shaft 4.
And a yoke 12 fitted to the outer peripheral portion of the rotating body 11,
The rotating body 11 and the yoke 1 are received by receiving the rotating body 11.
A closing plate 14 for closing the pump chamber 13 formed between
And a thrust receiving plate 15 fixed to the lower bearing housing 6 with bolts 16.

More specifically, the rotating body 11 has a boss portion 11a inserted into the lower end portion of the oil supply passage 8 in the drive shaft 4 and a collar portion 11 abutting against the lower end surface of the drive shaft 4.
b, an eccentric portion 11c eccentric to the drive shaft 4, and a suction passage 11d and a discharge passage 11e for discharging the oil in the pump chamber 13 to the oil supply passage 8.

Further, the yoke 12 is provided with an elliptical elongated hole 12a in the central portion and a pair of keys (not shown) extending in the minor axis direction on the outer portion. The eccentric portion 11c of the rotating body 11 is inserted into the 12a to form the pump chamber 13 between the eccentric portion 11c and the elongated hole 12a, and each key is attached to the lower end of the lower bearing housing 6. The sliding grooves (not shown) formed in the respective parts are fitted to each other so as to reciprocate only in the minor axis direction.

In the above structure, when the rotating body 11 is rotated by the driving rotation of the driving shaft 4, the yoke 12 is reciprocally moved in the minor axis direction by the eccentric rotation of the eccentric portion 11c. The reciprocating movement of the eccentric part 11c and the eccentric part 11c of the eccentric part 11c change the volume of the pump chamber 13 formed between the eccentric part 11c and the elongated hole 12a of the yoke 12, and the pump chamber 13 is lubricated by the change in the volume. It sucks oil or pressurizes the sucked lubricating oil and discharges it from the pump chamber 13.

The first embodiment shown in FIG. 1 has an oil absorbing cylinder 20 having an oil absorbing passage 21 communicating with a rotating body 11 of the oil supply pump 10 constructed as described above and an intake passage 11d of the rotating body 11. Is integrally provided on the inner peripheral surface of the oil absorption cylinder 20,
A spiral oil groove 22 for pressurizing suction oil by rotation of the oil absorption cylinder 20
Is provided.

However, when the lubricating oil is sucked into the pump chamber 13 by the rotation of the rotating body 11, since the suction side inlet is narrow, a constant suction pressure loss occurs due to the resistance when passing through this inlet. , The pressure drop due to this pressure loss will increase the volume of the refrigerant that dissolves in the suction oil. Also, when the refrigerant melts heavily and the refrigerant pressure (low pressure) decreases, the amount of increase in the refrigerant that melts is large. Although the amount of oil absorbed into the pump chamber 13 is reduced and the actual amount of oil supplied is reduced due to the foaming, the oil suction cylinder 20 having the oil groove 22 is provided so that the suction passage 11d of the rotating body 11 is closed. The flowing suction oil can be pressurized, and even when the low pressure of the refrigerant is reduced by this pressurization, the foaming of the refrigerant that dissolves in the suction oil can be reduced, and the reduction of the oil absorption amount due to the refrigerant bubbling can be suppressed. It is.

Therefore, even if the theoretical oil supply amount of the pump 10 is not increased, the theoretical oil supply amount can be secured, and
Since the theoretical amount of oil supply is not increased, it is possible to avoid excessive refueling during steady operation, that is, during steady operation in which the low pressure of the refrigerant becomes equal to or higher than a predetermined pressure.

In the first embodiment described above, the spiral oil groove 22 is formed in the oil absorption cylinder 20 by recessing the thread groove, but other coil-shaped members such as a coil spring are inserted. It may be formed by fitting.

Next, a second embodiment shown in FIG. 3 will be described.
In the second embodiment, like the first embodiment, the positive displacement oil supply pump 10 is a yoke pump, and the oil absorption cylinder 20 provided in the rotating body 11 is provided with the screw blades 23. In this case, since the screw blades 23 are provided, the pump chamber 13 passes from the oil absorption cylinder 20 through the suction passage 11d.
Since the pressurized state of the oil sucked into the cylinder can be increased and the suction pressure thereof can be effectively increased, foaming of the melted refrigerant can be further suppressed.

Next, the third embodiment shown in FIG. 4 and the fourth embodiment shown in FIG. 5 will be described. Similar to the first and second embodiments, these third and fourth embodiments use the yoke type pump as the positive displacement oil supply pump 10, and the oil absorption cylinder 20 is provided on the rotating body 11 to form the third embodiment. Then, a divider 24 is internally provided at the tip of the oil absorbing cylinder 20, and in the fourth embodiment, a throttle portion 25 capable of centrifugal pressurization is provided at the tip of the oil absorbing cylinder 20.

The divider 24 has a notch 2 at the lower end.
4a, and is constructed by being fixed to the inner surface on the tip end side of the oil absorbing cylinder 20 by welding or the like. In the embodiment shown in FIG. 4, the oil absorbing port 26 is provided on the tip surface of the oil absorbing cylinder 20.
An oil supply plate 26 having a is attached so that the oil taken in from the oil absorption port 26a can be pressurized by the rotation of the oil absorption cylinder 20.

Further, the throttle portion 25 is provided with the oil absorbing cylinder 20.
Although it may be formed by squeezing the tip side of the inside inward,
In the embodiment shown in (1), a trumpet-shaped throttle body 225A having a diameter that expands upward is formed, and the throttle body 25A is fixed to the tip end surface of the oil absorbing cylinder 20. According to the third embodiment described above, the existing divider 24 can be used, so that it is possible to suppress an increase in cost, and according to the fourth embodiment, the throttle body 27 is attached to the tip end surface of the oil absorbing cylinder 20. It can be configured only by itself, or it can be formed by narrowing down, so it can be configured by simple processing and without increasing the number of parts,
Refrigerant bubbling can be suppressed with the minimum cost increase.

Next, a fifth embodiment shown in FIGS. 6 and 7 will be described. In the fifth embodiment, the oil absorption cylinder 20 is provided on the rotary body 11 of the positive displacement oil supply pump 10 of the yoke type similar to each of the embodiments described above, and the oil absorption cylinder 20 is provided with a radial direction as shown in FIG. Impeller 27 having a discharge oil passage 27a extending to the
The oil suction port 28a, which opens to the low pressure side of the discharge passage 27a, communicates with the discharge side of the discharge passage 27a on the outside of the impeller 27, and the oil suction cylinder 20 is attached.
A pressure case 28 having a pressure passage 28b communicating with the oil suction passage 21 is provided, and the pressure case 28 is attached to the thrust bearing plate 15 fixed to the lower bearing housing 6 by a bolt 29.
It is fixed by.

A passage plate 30 is provided at the bottom of the pressurizing case 28 with a predetermined distance from the bottom surface of the case 28 via a spacer 30a, and is installed in close proximity to the impeller 27. Thus, the pressurizing passage 28b is provided between the outer peripheral portion of the impeller 27 and the lower end opening of the oil absorbing cylinder 20.
Is formed.

According to the fifth embodiment, the oil in the oil sump 7 sucked from the oil suction port 28a of the pressure case 28 by the centrifugal pump action by the rotation of the impeller 27 is discharged from the oil passage 27.
The pressure oil is pressurized and discharged through a, and the pressure oil is sucked into the pump chamber 13 of the pump 10 from the pressure passage 28b through the oil suction passage 21 of the oil suction cylinder 20. The length 20 in the axial direction is sufficient to mount the impeller 27, and the axial size of the impeller 28 can be short. Therefore, the spiral oil groove 22 is formed in the oil absorption cylinder 20 as in the embodiment described above. Since the vertical height (axial dimension) can be suppressed as compared with the case where the screw blades 23 are provided and the suction pressure of the oil can be sufficiently increased, the refrigerant bubbling can be more effectively reduced. is there.

The positive displacement oil supply pump 1 of the embodiment described above
Although 0 is a yoke type pump in all cases, it is also applicable to the case where a trochoid type pump is used as shown in FIG.

In the sixth embodiment shown in FIG. 8, the rotating body 3 serving as pump oil is provided in the oil supply passage 8 at the shaft end of the drive shaft 4.
1 is inserted and fixed, and a thrust receiving plate 32 and a pump casing 33 that receive the lower end surface of the drive shaft 4 are attached to the lower end portion of the lower bearing housing 6, while the rotary body 31 has a large number of outer peripheral portions. An inner rotor 34 having teeth is attached, and an outer rotor 35 having a large number of teeth, which is one more than the number of teeth of the inner rotor 34, is eccentrically arranged on the inner peripheral portion of the pump case 33 with respect to the axial center of the inner rotor 34. A trochoidal pump is configured to be attached rotatably about an axis, and an oil absorption cylinder 40 having an oil absorption passage 41 protruding from the pump casing 33 toward the oil sump 7 is integrally formed on the rotary body 31. The oil suction passage 41 of the oil suction cylinder 40 is provided with a centrifugal pressurizing passage 42 that opens radially toward the suction chamber 36 of the pump casing 33. It is.

More specifically, the inner rotor 34 will be described.
And the outer rotor 35 in the upper axial direction, a discharge port 37a.
The discharge side end plate 37 with a suction port 38
A suction side end plate 38 having a is provided, a discharge chamber 39 is provided above the discharge side end plate 37, and a suction side end plate 3 is provided.
8, the suction chamber 36 is provided on the lower side, and the discharge chamber 39 is provided in the upper center part of the rotating body 31. The communication passage 31 is provided in the discharge passage 31a opening to the oil supply passage 8.
The centrifugal pressurizing passage 42 is opened to the suction chamber 36 by communicating with the inner rotor 34 and the outer rotor 35 by the rotation of the rotating body 31 due to the driving rotation of the drive shaft 4. And each of these rotors 3
4, 35 teeth rotate in mesh with each other, and the volume change of the pump chamber 43 formed between the contact portions of these teeth causes the oil in the oil reservoir 7 to absorb oil in the oil absorption passage 41 of the oil absorption cylinder 40 and the suction chamber. After being sucked into the pump chamber 43 and pressurized, the gas is discharged into the discharge chamber 39 through 36, and the communication passage 31b and the discharge passage 31 are discharged.
The oil is supplied to the oil supply passage 8 through a.

At this time, since the oil absorption cylinder 40 is provided with the centrifugal pressurizing passage 42 extending in the radial direction toward the suction chamber 36, the oil absorption cylinder 40 by the rotation of the rotating body 31.
The rotation allows the oil absorbed by the oil absorption passage 41 to be pressurized, and the pressure in the suction chamber 36 can be increased.
Therefore, since the suction oil sucked from the suction chamber 36 into the pump chamber 43 can be increased in pressure, even if the low pressure of the refrigerant is lowered, the foaming of the melted refrigerant due to the suction pressure loss can be reduced.

In the trochoidal pump constructed as described above, since the suction chamber 36 is formed around the rotating body 31, it is only necessary to provide the oil suction cylinder 40 with the centrifugal pressurizing passage 42 extending in the radial direction. The suction oil in the suction chamber 36 can be pressurized, and therefore, as in the first to fifth embodiments described above,
Even if the spiral oil groove 22 is not provided in the oil absorption cylinder 20 or the pressurizing means such as the screw blades 23 and the divider 24 is not provided, the pressurizing passage 42 is simply provided and the suction oil is sufficiently pressurized. Further, by providing the oil absorption cylinder 31 with the spiral oil groove 22, or by providing the screw blades 23, the divider 24, etc., two-stage pressurization is possible, and the suction pressure can be increased more effectively and the refrigerant It is possible to further reduce the foaming. Further, since the oil absorption cylinder 40 is projected from the pump casing 33 toward the oil sump 7, it is possible to check the rotation of the drive shaft 4 and thus the pump drive from the outside while using the trochoidal pump.

In each of the embodiments described above, the oil absorbing cylinder 20,
Although 40 is formed integrally with the rotating bodies 11 and 31, it may be attached as a separate member.

Further, the above-mentioned respective embodiments are provided with the oil absorption cylinders 20 and 4.
0 is provided, and a pressurizing device such as a spiral oil groove for performing a pressurizing action is provided on the oil absorption cylinders 20 and 40 to form a pressurizing device for pressurizing the suction oil flowing through the suction passage 11d of the pump 10. This pressurizing device may be configured by providing a pump separately from the pump 10.

[0041]

According to the invention of claim 1, the pump 1
Since the pressurizing device for pressurizing the suction oil flowing through the suction passage 11d is provided in the suction passage 11d of 0, the pump 10
Even if the theoretical oil supply amount is not increased, the suction pressure when the oil is absorbed in the pump chamber can be increased to suppress the foaming of the melted refrigerant, and therefore, when the refrigerant melts into the lubricating oil to a large extent, the low pressure of the refrigerant is reduced. Even if the pressure drops, the theoretical amount of oil supply can be secured, and since the amount of theoretical oil supply is not increased, there is no over-fueling during steady operation, and no problems due to over-fueling occur.

According to the second aspect of the present invention, since the spiral oil groove 22 is provided in the oil absorption cylinder 20, the suction pressure of the oil absorbed can be increased with a simple structure without increasing the number of parts. .

According to the third aspect of the invention, since the oil absorption cylinder 20 is provided with the screw blades 23, the pressurizing performance of the suction pressure can be increased, and the foaming of the melted refrigerant can be further suppressed.

Further, in the invention according to claim 4, since the divider 24 is internally provided at the tip end portion of the oil absorbing cylinder 20, an existing product can be used, and it is possible to suppress an increase in cost. In the invention, since the throttle portion 25 is provided on the tip end side of the oil absorbing cylinder 20, the oil absorbing cylinder 20 can be configured by simple processing without increasing the number of parts.
Refrigerant bubbling can be suppressed with a minimum cost increase by only providing 0.

In the invention according to claim 6, the impeller 27 and the pressure case 28 are provided, and the impeller 27 is provided.
By the centrifugal pump action by the rotation of the pressurizing case 28 to pressurize in the pressurizing passage 28b of the pressurizing case 28 and discharge the oil to the oil absorption cylinder 20, a sufficient increase in the suction pressure of oil is ensured while suppressing the vertical height. Therefore, the refrigerant bubbling can be reduced more effectively.

Further, in the invention according to claim 7, the positive displacement oil supply pump 10 is of a trochoid type, and the oil absorption cylinder 40 is provided on the rotating body 31 which rotates together with the inner rotor 34, and the oil absorption cylinder 40 is centrifugally pressurized. Since the passage 42 is provided, the pump drive can be checked from the outside while using the trochoidal pump, and the spiral oil groove can be processed,
Even if components such as a screw blade and a divider are not added, the oil to be absorbed can be sufficiently pressurized with a simple structure in which the centrifugal pressure passage 42 is provided.
By providing a spiral oil groove, or by providing a screw blade or a divider, two-stage pressurization is possible, and refrigerant bubbling can be reduced more effectively.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the entire compressor of the first embodiment.

FIG. 3 is an enlarged cross-sectional view of the essential parts of the second embodiment.

FIG. 4 is an enlarged cross-sectional view of the essential parts of the third embodiment.

FIG. 5 is an enlarged cross-sectional view of the essential parts of the fourth embodiment.

FIG. 6 is an enlarged cross-sectional view of the essential parts of the fifth embodiment.

FIG. 7 is a sectional plan view of an impeller according to a fifth embodiment.

FIG. 8 is an enlarged cross-sectional view of the essential parts of the sixth embodiment.

FIG. 9 is a sectional view of a main part showing a conventional example.

FIG. 10 is a P-V diagram showing the relationship between the refrigerant pressure P and the change in the volume V.

[Explanation of symbols]

1 closed casing 2
Compression element 4 Drive shaft 7
Oil sump 8 Oil supply passage 10
Positive displacement lubrication pump 11,31 Rotating body 11d
Suction passage 20,40 Oil absorption cylinder 21,4
1 Oil absorption path 22 Spiral oil groove 23
Screw blade 24 Divider 25
Throttle section 25A Throttle body 27
Impeller 27a Discharge oil passage 28
Pressure case 28a Oil inlet 28b
Pressure passage 33 Pump casing 34
Inner rotor 35 Outer rotor 36
Suction chamber 42 Centrifugal pressure passage

Front Page Continuation (72) Inventor Takashi Kanayama 3-12 Chikko Shinmachi, Sakai City, Osaka Prefecture Daikin Industrial Co., Ltd. Sakai Manufacturing Co., Ltd. inside the seaside factory (72) Inventor Shusaku Ueda 3/12 Chikko Shinmachi, Sakai City, Osaka Daikin Industrial Co., Ltd. Company Sakai Plant inside the seaside factory (72) Inventor Toshiaki Yoshii, 3-12 Tsukiko Shinmachi, Sakai City, Osaka Prefecture Daikin Industrial Co., Ltd. Inside the seaside factory (72) Tomoyuki Akagawa 3-12 Tsukiko Shinmachi, Sakai City, Osaka Prefecture Daikin Sakai Works Co., Ltd.

Claims (7)

[Claims] 1. A compression element (2) is installed in an upper part of a casing (1) having an opening of a refrigerant suction pipe (1b), an oil sump (7) is provided in a lower part thereof, and the compression element (2) is driven. A refrigerant compressor having a drive shaft (4) provided with a positive displacement oil supply pump (10) opening to the oil sump (7), wherein the suction passage (11d) is provided in the suction passage (11d) of the oil supply pump (10). A refrigerant compressor provided with a pressurizing device for pressurizing suction oil flowing through the refrigerant compressor. 2. A rotary body (1) of a positive displacement oil supply pump (10).
1) is provided with an oil absorption cylinder (20) having an oil absorption passage (21) communicating with the suction passage (11d) of the rotating body (11),
The oil absorption cylinder (20) is provided with a spiral oil groove (22) for pressurizing the suction oil by the rotation of the oil absorption cylinder (20).
Refrigerant compressor described. 3. A rotary body (1) of a positive displacement oil supply pump (10).
1) is provided with an oil absorption cylinder (20) having an oil absorption passage (21) communicating with the suction passage (11d) of the rotating body (11),
The refrigerant compressor according to claim 1, wherein the oil absorption cylinder (20) is provided with screw blades (23) for pressurizing the suction oil by the rotation of the oil absorption cylinder (20). 4. A rotary body (1) of a positive displacement oil supply pump (10).
1) is provided with an oil absorption cylinder (20) having an oil absorption passage (21) communicating with the suction passage (11d) of the rotating body (11),
The refrigerant compressor according to claim 1, wherein a divider (24) is provided inside the tip of the oil absorbing cylinder (20). 5. A rotary body (1) of a positive displacement oil supply pump (10).
1) is provided with an oil absorption cylinder (20) having an oil absorption passage (21) communicating with the suction passage (11d) of the rotating body (11),
The refrigerant compressor according to claim 1, wherein a throttle portion (25) capable of centrifugally pressurizing is provided on a tip end side of the oil absorbing cylinder (20). 6. A rotary body (1) of a positive displacement oil supply pump (10).
1) is provided with an oil absorption cylinder (20) having an oil absorption passage (21) communicating with the suction passage (11d) of the rotating body (11),
A discharge oil passage (27) extending in a radial direction is provided in the oil absorption cylinder (20).
The impeller (27) having a) is attached, and the oil suction port (28a) opening to the low pressure side of the discharge oil passage (27a) and the discharge oil passage (27) are attached to the outside of the impeller (27).
The refrigerant compression according to claim 1, further comprising a pressurizing case (28) having a pressurizing passage (28b) communicating with the discharge side of (a) and communicating with the oil absorbing passage (21) of the oil absorbing cylinder (20). Machine. 7. A positive displacement oil pump (10) comprises an inner rotor (34) that rotates together with a rotating body (31), and an outer rotor () having an eccentric shaft center that is eccentric to the shaft center of the inner rotor (34). 35) and a trochoid pump in which the rotors (34) and (35) are housed in a pump casing (33), and the rotor (31)
Is provided with an oil absorption cylinder (40) having an oil absorption path (41) protruding from the pump case (33) toward the oil sump (7), and the oil absorption path (41) of the oil absorption tube (40) is The refrigerant compressor according to claim 1, wherein a centrifugal pressurizing passage (42) is provided which opens radially toward the suction chamber (36) of the pump casing (33).