JP2003161274A - Screw type fluid device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type fluid device easy to be manufactured and provided with a lubrication route capable of reducing the leak of a coolant from a discharge side clearance. <P>SOLUTION: This screw type fluid device comprises a screw rotor 20 comprising a male rotor 22 having a spiral screw 21 and a female rotor 24 having a screw 23 meshed with the spiral screw 21; a rotor driven part provided on one end part of the male rotor 22 to give a drive force to the male rotor 22; a front casing 40 for housing the screw rotor 20 and the rotor drive part; a rear casing 50 mounted in contact with the front casing 40; the lubrication route 100 for lubricating the screw rotor 20 and bearings 22a, 22b, 24a and 24b. The rear casing 50 comprises a lubricating oil passage 103 for constituting the lubrication route 100, which can directly supply lubricating oil to the bearing-side end surface 22a of the screw 21 of the male rotor 22. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type fluid device, and more particularly, to a compressor for compressing a refrigerant in a refrigeration cycle.

[0002]

2. Description of the Related Art FIG. 2 is a view showing a conventional screw type fluid device (particularly, a screw type compressor for compressing a refrigerant in a refrigeration cycle), in which (a) is a cross sectional view.
(B) is a side sectional view. The screw type fluid device 10 shown in the figure includes a screw rotor unit 20 and a rotor drive unit 3.
0, front casing 40, rear casing 50
It is composed mainly of and.

The screw rotor portion 20 has a male rotor 22 having a threaded portion 21 spirally cut in the center, and a female rotor 22 having a threaded portion 23 meshing with the threaded portion 21 spirally cut in the center. 24 and. Both ends of the male rotor 22 and the female rotor 24 are rotatably supported by bearings described later. Further, when the screw portion 21 of the male rotor 22 and the screw portion 23 of the female rotor 24 mesh with each other, a meshing space is formed between them.

The rotor drive unit 30 includes, for example, a rotor 31.
And the stator 32. A rotor 31 is fixed to one end of the male rotor 22, and a stator 32 is arranged so as to surround the rotor 31. Therefore, when a voltage is applied to the rotor drive unit 30 and the rotor 31 starts rotating, the male rotor 22 and the female rotor 24 rotate while meshing with each other.

The front casing 40 is a casing which surrounds the screw rotor portion 20 and the rotor driving portion 30 described above, and accommodates the screw rotor portion 20 and the rotor driving portion 30 inside. Also,
Bearings 22a and 24a for supporting one end portions (the end portions located on the left side in FIG. 2) of the male rotor 22 and the female rotor 24 are provided in the front casing 40, respectively.

The rear casing 50 is a casing provided in contact with the above-mentioned front casing 40, and forms the main body of the screw type fluid device 10 together with the front casing 40. Further, the rear casing 50 is provided with bearings 22b and 24b which respectively support the other ends (the ends located on the right side in FIG. 2) of the male rotor 22 and the female rotor 24. Further, a cover plate 60 is attached to the side of the rear casing 50 opposite to the front casing 40. The reference numeral 70 indicates the cover plate 6.
It is an oil separator attached to 0. Further, reference numeral 80 indicates the screw portion 21 of the male rotor 22 and the female rotor 24.
It is an oil pool formed below the threaded portion 23 and in the front casing 40.

FIG. 3 is an enlarged and detailed view of a portion surrounded by a circle A in FIG. 2 (a). As shown in FIG. 3, the screw type fluid device 10 is provided with an oil supply passage 90 for supplying the lubricating oil accumulated in the oil sump 80 described above to the screw rotor portion 20 and the bearings 22a, 22b, 24a, 24b. Has been.

The oil supply path 90 is provided with an introduction path 90a for guiding lubricating oil from the oil sump 80 to the side of the screw portion 23 of the female rotor 24 (downward in FIG. 3), and the bearings 22a and 24a from the side of the screw portion 23. The first path 91 extending to the side (left side in FIG. 3) and the bearings 22b and 2 from the side of the screw portion 23.
Second path 92 extending to the side of 4b (right side in FIG. 3)
And a fourth path 94 that guides the lubricating oil that has passed through these bearings 22b and 24b to the screw rotor portion 20, that is, the thread tip portion (hereinafter referred to as "chip") of the screw portion 23 of the female rotor 24 here. Be prepared.

As shown by the arrow in FIG. 3, the lubricating oil that has passed through the first path 91 is guided to the refrigerant suction chamber (not shown) after passing through the bearing 22a or the bearing 24a. The lubricating oil that has passed through the second path 92 passes through the inlet 95 to the bearings 22b and 24b, and the bearings 22b and 24b.
b, respectively. Bearing 22b
The lubricating oil that has passed through is guided to the bearing 24b side through the recessed portion 60a formed on the inner surface of the cover plate 60, merges with the lubricating oil that has passed through the bearing 24b, and then from the cover plate 60 side to the fourth path 94. And is supplied to the tip of the screw portion 23 of the female rotor 24. The lubricating oil thus supplied to the tip of the screw portion 23 of the female rotor 24 is also supplied to the screw portion 21 of the male rotor 22 and is finally discharged together with the compressed refrigerant toward the oil separator 70. The Rukoto.

[0010]

However, since the lubricating oil is guided to the tip of the threaded portion of the female rotor in the above-described oil supply passage, at least one bend ( That is, it is necessary to provide a bent portion for directing a hole drilled from the end surface of the front casing on the rear casing side toward the tip side of the screw portion of the female rotor, and it takes a lot of time and labor to manufacture the fourth path, which complicates the working process. There was a problem that became.

Further, since the lubricating oil is guided to the tip of the rotor, there is a problem in that the lubricating oil does not reach the discharge side portion sufficiently and a seal leak occurs in the discharge side gap, resulting in a decrease in efficiency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a screw type fluid device having an oil supply passage which is easy to manufacture and can reduce discharge side leakage.

[0013]

In order to solve the above problems, the screw type fluid apparatus of the present invention employs the following means. That is, according to the screw type fluid device of claim 1, a male rotor having a spiral screw portion and a female rotor having a screw portion that meshes with the spiral screw portion are provided, and the screw portion of the male rotor is provided. When the screw portion of the female rotor meshes with each other, a screw rotor portion in which a meshing space is formed between the screw rotor portion and the female rotor is provided at one end portion of the male rotor or the female rotor, and the male rotor and the female rotor are mutually provided. A rotor driving unit that applies a driving force to the male rotor or the female rotor so as to rotate while meshing, a front casing that surrounds the screw rotor unit and the rotor driving unit, and the other ends of the male rotor and the female rotor. A rear casing for accommodating bearings for supporting the respective parts and being attached in contact with the front casing; In a screw type fluid device comprising a rew rotor part and an oil supply path for supplying oil to the bearing, the oil supply path is formed in the rear casing, and the screw part of the male rotor and / or the screw of the female rotor is formed. A lubricating oil flow path capable of directly supplying lubricating oil is provided on the end surface of the portion located on the bearing side.

In this screw type fluid device, the lubricating oil supplied to the screw portion of the screw rotor portion is supplied from the rear casing side to the bearing side end surface of the screw portion of the male rotor and / or the screw portion of the female rotor. Will be done.

According to a second aspect of the screw fluid device of the present invention, in the screw fluid device of the first aspect, the lubricating oil flow passage has the other end of the male rotor and the female rotor in the rear casing. It is characterized in that the lubricating oil that lubricates the bearings that respectively support the parts is introduced.

In this screw type fluid device, the lubricating oil is supplied after lubricating the bearings that respectively support the other ends of the male rotor and the female rotor. That is, as shown in FIG. 1, all the lubricating oil that lubricates the bearings that respectively support the other ends of the male rotor and the female rotor is supplied to the bearing-side end surface of the screw portion via the lubricating oil flow path. .

According to the screw type fluid device of the third aspect, in the screw type fluid device of the second aspect, the lubricating oil flow passage linearly penetrates one end surface and the other end surface of the rear casing. It is characterized by being a communication hole.

In this screw type fluid device, the lubricating oil flow path is formed as a communication hole that linearly penetrates the one end surface and the other end surface of the rear casing.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The description of the main constituent elements of the screw fluid device 10 (see FIG. 2) is the same as the above-mentioned contents, and therefore the description thereof is omitted here. Therefore, only the features of the present invention will be described here. Further, the same members as those of the related art are designated by the same reference numerals.

FIG. 1 is a view showing an embodiment of the present invention and is similar to FIG. In FIG. 1, arrows indicate the flow of lubricating oil. As shown in FIG. 1, in the screw type fluid device according to the present invention, the lubricating oil accumulated in the oil pool 80 is used for the screw rotor portion 20 and the bearing 22.
An oil supply path 100 is provided for supplying the oil to a, 22b, 24a, and 24b.

The oil supply path 100 includes an introduction path 100a for guiding lubricating oil from the oil sump 80 to the side of the screw portion 23 of the female rotor 24 (downward in FIG. 1), and bearings 22a and 24a from the side of the screw portion 23. The first path 101 extending to the side (left side in FIG. 1) and the bearing 22 from the side of the screw portion 23.
The second path 102 extending to the sides b and 24b (right side in FIG. 1) and the lubricating oil that has passed through these bearings 22b and 24b is the bearing side end surface 2 of the screw portion 21 of the male rotor 22 described above.
And a third path (lubricating oil path) 103 that can be directly supplied to 2c.

The terminal end of the introduction path 100a and the first path 101 are flow paths formed in the wall of the front casing 40. As a result, the lubricating oil in the oil sump 80 is guided to the bearing 24a by the high pressure generated in the device. The lubricating oil guided to the bearing 24a lubricates the bearing 24a and then is guided to a refrigerant suction chamber (not shown). Further, a part of the lubricating oil guided to the bearing 24a is guided to the bearing 22a, and after lubricating the bearing 22a, is guided to a refrigerant suction chamber (not shown).

The second path 102 is the front casing 4
0 and the flow passage formed in the wall of the rear casing 50. As a result, the lubricating oil in the oil sump 80 is guided to the bearing 24b by the high pressure generated in the device. The lubricating oil guided to the bearing 24b lubricates the bearing 24b and then is guided to the bearing 22b side through the recess 60a formed on the inner surface side of the cover plate 60. Further, a part of the lubricating oil guided to the bearing 24b is guided to the bearing 22b, lubricates the bearing 22b, and then joins with the lubricating oil that has passed through the recess 60a.

The third path 103 is a flow path formed in the wall of the rear casing 50 on the side opposite to the second path 102 in FIG. 1, and has an end face (one end face) 50a in contact with the front casing 40 of the rear casing 50. And the end face (the other end face) 50b on the opposite side to each other. In addition, the end surface 50 in which the third flow path 103 contacts the cover plate 60
An enlarged diameter portion 103a is provided in b so that the lubricating oil that has passed through the bearings 22b and 24b and merged can be easily guided into the third flow path 103. As a result, the lubricating oil that has passed through the bearings 22b and 24b and merged is
After being introduced into the third flow path 103 through 03a, it is supplied to the bearing side end surface 22c of the screw portion 21 of the male rotor 22 through the third flow path 103. In this way the male rotor 2
The lubricating oil supplied to the bearing-side end surface 22c of the second screw portion 21 is also supplied to the screw portion 23 of the female rotor 24, and finally, together with the compressed refrigerant, the oil separator 70.
Will be discharged toward.

As described above, the lubricating oil in the oil sump 80 is introduced into the introduction passage 100a → the second passage 102 → the bearing 24.
b, 22b-> Through the third flow path (lubricating oil flow path) 103, the oil is supplied to the bearing side end surface 22c of the screw portion 21 of the male rotor 22. With this structure, it is possible to prevent the leakage of the refrigerant on the discharge side surface, and at the same time, the bearing 22
The lubrication of b and 24b is sufficiently performed.

It is further advantageous if the third flow path 103 is formed so as to connect the one end surface 50a and the other end surface 50b of the rear casing 50 in a straight line.

That is, the third flow path 103 can be manufactured by a single drilling work or the like, which simplifies the manufacturing work.

The diameter (size) of the third flow path 103 can be appropriately selected as needed. Further, a throttle (orifice) can be provided in the third flow passage 103 for adjusting the flow rate.

The present invention is not limited to the compressor for compressing the refrigerant in the refrigeration cycle, but can be applied to a compressor for compressing other fluids such as an air compressor if necessary. Is. Further, not only those having a function as a compressor but also those having a function as a pump such as a vacuum pump can be applied.

[0030]

According to the screw type fluid apparatus of the present invention, the following effects can be obtained. That is, according to the screw type fluid device of the first aspect, the lubricating oil supplied to the screw portion of the screw rotor portion is applied to the bearing side end surface of the screw portion of the male rotor and / or the screw portion of the female rotor. Since it is supplied from the rear casing side, there is no need to provide an oil supply path for supplying lubricating oil to the screw part of the screw rotor part in the front casing, and the work time required to manufacture the front casing is shortened. In addition, it is possible to reduce the leakage (compressed leakage of the refrigerant) at the end surface of the discharge side and improve the compression efficiency.

According to the screw type fluid device of the second aspect, all the lubricating oil after lubricating the bearings which respectively support the other ends of the male rotor and the female rotor is passed through the lubricating oil flow path to the threaded portion. Will be supplied to the bearing side end surface of
In other words, the lubricating oil that has left the oil pool will be supplied to the bearing side end surface of the threaded portion through the bearing and the lubricating oil flow path without staying in the oil supply path, so that sufficient lubrication of the bearing can be achieved. It has the effect of being able to.

According to the screw type fluid device of the third aspect, the lubricating oil flow path is formed as a communication hole that linearly penetrates the one end surface and the other end surface of the rear casing. Since the lubricating oil flow path can be formed by the drilling work, the working process can be simplified, the working time can be shortened, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing an embodiment of a laminated heat exchanger according to the present invention.

2A and 2B are diagrams showing the outline of the overall configuration of a screw type fluid device, in which FIG. 2A is a lateral sectional view and FIG. 2B is a side sectional view.

FIG. 3 is an enlarged and detailed view of a portion surrounded by a circle A in FIG. 2 (a).

[Explanation of symbols]

10 Screw type fluid device 20 Screw rotor part 21 Thread 22 Male rotor 22a bearing 22b bearing 22c Bearing end face 23 Thread 24 female rotor 24a bearing 24b bearing 30 rotor drive 40 front casing 50 rear casing 50a One end surface 50b other end surface 90 Refueling route 100 refueling route 103 Third flow path (lubricating oil flow path)

Claims (3)

[Claims] 1. A male rotor having a spiral threaded portion and a female rotor having a threaded portion that meshes with the helical threaded portion, wherein the male rotor threaded portion and the female rotor threaded portion are meshed with each other. A screw rotor portion in which a meshing space is formed between them, and the screw rotor portion is provided at one end portion of the male rotor or the female rotor,
A rotor driving unit that applies a driving force to the male rotor or the female rotor such that the male rotor and the female rotor rotate while meshing with each other; a front casing that surrounds the screw rotor unit and the rotor driving unit; A rear casing that houses bearings that respectively support the other ends of the male rotor and the female rotor and that is attached in contact with the front casing, and an oil supply path for supplying oil to the screw rotor unit and the bearings are provided. In the screw fluid device, the lubricating oil passage is configured in the rear casing, and lubricating oil is directly supplied to an end surface of the male rotor screw portion and / or the female rotor screw portion located on the bearing side. A screw-type flow characterized by a lubricating oil flow path Body device. 2. The screw type fluid device according to claim 1, wherein the lubricating oil passage lubricates a bearing that supports the other end of each of the male rotor and the female rotor in the rear casing. A screw type fluid device, wherein the screw type fluid device is configured to be introduced. 3. The screw type fluid device according to claim 2, wherein the lubricating oil flow path is a communication hole that linearly penetrates one end surface and the other end surface of the rear casing. Fluid device.