JP2006207471A - Turbo compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of superior cost performance in a turbo compressor of a type supporting a shaft on which compression blades are attached by rolling bearing mechanisms arranged at positions separate in an axial direction. <P>SOLUTION: The rolling bearing mechanism consists of one of a deep groove ball bearing 5a, a tapered roller baring 5c or a cylindrical roller bearing 5b in the turbo compressor of the type rotatably supporting the shaft 4 on which the compression blades 4a are attached by the rolling bearing mechanisms 5, 5 arranged at positions separate in the axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a turbo compressor used for air conditioning for air conditioning, and particularly to a bearing structure for supporting the impeller.

  As a relatively large-capacity air conditioning system device such as a building air conditioner or a district heat supply, there is a turbo refrigerator. In general, the structure and principle of the compressor of the turbo refrigerator is such that a rotation power source such as a drive motor is rotated directly or via a speed increaser to rotate the compression blades to a predetermined number of rotations to compress the refrigerant, The refrigerant is compressed to a high temperature and pressure, and is used for heating by exchanging heat with cooling water in a condenser (heat exchanger). In addition, the refrigerant passes through the condenser and then expands in the expander to become low temperature and low pressure. This time, the refrigerant (heat exchanger) exchanges heat with cold water, and this cold water is used for cooling. And the refrigerant | coolant which passed through the evaporator repeats the cycle of compressing with a compression blade again.

In order to increase the compression efficiency, the compression blade is commonly used at a rotational speed exceeding 10,000 rpm. The shaft of such a compression blade is usually supported by an oil-lubricated sliding bearing, and since oil film shearing occurs at the sliding bearing at high speed rotation, power loss due to increased rotational resistance is inevitably excessive. End up.
JP-A-5-223090 JP 2002-303298 A

In order to improve the power loss, Patent Document 2 discloses the use of an angular ball bearing. However, the angular ball bearing is expensive, so there is a problem in terms of cost performance.
In recent years, the thrust force acting on the compression blades tends to become stronger due to the adoption of a multistage compression mechanism or the like, and thus a bearing mechanism that can withstand a stronger thrust force is required.
The present invention has been made in order to solve such problems of the prior art, and the problem is that the shaft to which the compression blades are attached is disposed at a position separated in the axial direction. A turbo compressor of a type that is rotatably supported by a rolling bearing mechanism is to provide a configuration with excellent cost performance.

  The technical means made by the present invention to achieve the above object is a turbo compression of a type in which a shaft to which a compression blade is attached is rotatably supported by a rolling bearing mechanism arranged at a position separated in the axial direction. In this machine, the rolling bearing mechanism is a turbo compressor characterized in that it is composed of any one of a deep groove ball bearing, a tapered roller bearing, and a cylindrical roller bearing. According to this invention, it can be set as the structure excellent in cost performance, without using an expensive angular ball bearing.

  The configuration of the present invention is also effective in a turbo compressor having a mechanism for increasing the speed of an impeller shaft via a speed increasing mechanism. An example of the speed increasing mechanism is a speed increasing gear.

  Furthermore, at least one of the rolling bearing mechanisms arranged at positions distant from each other in the axial direction has a tapered roller bearing or a deep groove ball bearing, whereby durability against thrust force is improved.

  In addition, if at least one of the rolling bearing mechanisms arranged at positions separated in the axial direction is a bearing mechanism in which two or more rolling bearings are combined, durability against a stronger thrust force is improved.

  Moreover, if the rolling bearing mechanism arrange | positioned in the position distant from the axial direction is a bearing mechanism which combined the 2 or more rolling bearing, it is preferable in order to improve the durability with respect to thrust force.

  Further, each rolling bearing mechanism arranged at a position distant in the axial direction has one deep groove ball bearing, so that the durability against thrust force is not significantly impaired and can be used at higher speed.

  Furthermore, in a turbo compressor of a type in which a shaft to which a compression blade is attached is rotatably supported by a rolling bearing mechanism disposed at a position separated in the axial direction, a rolling element of a bearing constituting the rolling bearing mechanism is provided. If the structure is made of ceramic, the centrifugal force due to the revolution of the rolling elements can be reduced in use at high speed rotation, which is effective in improving durability.

  According to the present invention, in a turbo compressor of a type in which a shaft to which a compression blade is attached is rotatably supported by a rolling bearing mechanism arranged at a position separated in the axial direction, durability against thrust force is improved. A turbo compressor with excellent cost performance can be provided.

The best mode for carrying out the present invention will be described below. Note that the present embodiment is merely an embodiment of the present invention, and is not construed as being limited thereto. The design can be changed within the scope of the present invention.
Hereinafter, a turbo compressor with a speed increasing mechanism will be described as an example of the turbo compressor of the present invention. FIG. 1 is a schematic view showing a main part of a turbo compressor according to Embodiment 1 of the present invention, FIG. 2 is an enlarged schematic view showing a bearing mechanism portion of FIG. 1, and FIGS. 3 to 5 are other bearings of Embodiment 1. 6 to 11 are schematic views of the bearing mechanism in the second embodiment of the present invention, and FIG. 12 is a schematic view of the bearing mechanism in the third embodiment of the present invention.

  As shown in FIG. 1, a gear (helical gear) 3a is attached to the tip of an output shaft 2 of a rotary power source (drive motor) 1 that is rotatably supported by a bearing (not shown). On the other hand, the rotation shaft (impeller wheel shaft) 4 of the compression mechanism having the compression blade 4a attached to the tip is rotatably supported by two rolling bearing mechanisms 5 and 5 arranged at positions separated in the axial direction. A pinion (helical gear) 3b is attached between the two rolling bearing mechanisms 5 and 5 of the rotating shaft 4, and the pinion 3b meshes with the gear 3a. In the illustrated example, the speed of the speed increasing mechanism (speed increasing gear) 3 is configured by forming the diameter of the pinion 3b smaller than the diameter of the gear 3a. Therefore, the rotational force of the output shaft 2 of the motor 1 is transmitted to the rotating shaft 4 after being accelerated by the speed increasing mechanism 3.

As shown in FIG. 2, the rolling bearing mechanisms 5 and 5 are composed of deep groove ball bearings 5a and 5a. In addition, the rolling bearing mechanisms 5 and 5 of the present embodiment are not limited to the deep groove ball bearings, and it is also possible to apply cylindrical roller bearings 5b and tapered roller bearings 5c, and are within the scope of the present invention.
FIG. 3 shows an example of an embodiment in which a deep groove ball bearing 5a is arranged on one side and a cylindrical roller bearing 5b is arranged on the other side, and FIG. 4 shows an example of an embodiment in which a deep groove ball bearing 5a is arranged on one side and a tapered roller bearing 5c is arranged on the other side.
FIG. 5 shows an example in which a cylindrical roller bearing 5b is arranged on one side and a deep groove ball bearing 5a is arranged on the other side. As described above, any one of the rolling bearing mechanisms 5 and 5 may be provided with any one of the deep groove ball bearing 5a, the cylindrical roller bearing 5b, and the tapered roller bearing 5c. It is possible to change the design of such a bearing within the scope of the present invention.
According to the present embodiment, it is possible to obtain a configuration with excellent cost performance without using an expensive angular ball bearing.

  Further, if the rolling elements 5a-1 (5b-1, 5c-1) of the respective bearings constituting the rolling bearing mechanisms 5 and 5 are made of ceramic, the centrifugal force due to the revolution of the rolling elements when used at high speed rotation. This is effective in improving durability.

  In the present embodiment, as described above, the turbo compressor provided with the mechanism for increasing the speed of the rotating shaft 4 via the speed increasing mechanism 3 has been described. However, the turbo compressor of the present invention is not limited to this and is not limited thereto. Other configurations can be selected within the scope.

  6 to 11 are schematic views showing a bearing mechanism in Embodiment 2 of the turbo compressor of the present invention. In addition, since it is the same as that of Example 1 about the structure and effect other than the bearing mechanism which comprises the turbo compressor, the description is abbreviate | omitted.

The bearing mechanism in the present embodiment is an example of an embodiment in which one rolling bearing mechanism 5 is a bearing mechanism in which two or more rolling bearings are combined, and the other rolling bearing mechanism 5 is composed of one rolling bearing. In the present embodiment, it is within the scope of the present invention if at least one rolling bearing mechanism 5 is constituted by a combination of two or more rolling bearings.
According to the configuration of the present embodiment, durability against a stronger thrust force is improved.
Hereinafter, an example is specifically given based on drawing.

FIG. 6 shows an example in which two deep groove ball bearings 5 a, 5 a are arranged as one rolling bearing mechanism 5, and one deep groove ball bearing 5 a is arranged as the other rolling bearing mechanism 5.
FIG. 7 shows an example in which three deep groove ball bearings 5 a, 5 a, 5 a are arranged as one rolling bearing mechanism 5, and one deep groove ball bearing 5 a is arranged as the other rolling bearing mechanism 5.

FIG. 8 shows an example in which two tapered roller bearings 5 c and 5 c are arranged as one rolling bearing mechanism 5, and one tapered roller bearing 5 c is arranged as the other rolling bearing mechanism 5.
FIG. 9 shows an example in which three tapered roller bearings 5 c, 5 c, 5 c are arranged as one rolling bearing mechanism 5, and one tapered roller bearing 5 c is arranged as the other rolling bearing mechanism 5.

  FIG. 10 is an example of an embodiment in which two tapered roller bearings 5 c and 5 c are arranged as one rolling bearing mechanism 5 and one cylindrical roller bearing 5 b is arranged as the other rolling bearing mechanism 5.

  FIG. 11 shows an example in which three cylindrical roller bearings 5 b, 5 b, 5 b are arranged as one rolling bearing mechanism 5, and one deep groove ball bearing 5 a is arranged as the other rolling bearing mechanism 5.

FIG. 12 is a schematic view showing a bearing mechanism in Embodiment 3 of the turbo compressor of the present invention.
The bearing mechanism in the present embodiment is an example of an implementation in which the two rolling bearing mechanisms 5 and 5 are combined with two or more rolling bearings. In addition, since it is the same as that of Example 1 about another structure and effect other than a bearing mechanism, the description is abbreviate | omitted.
In the present embodiment, one rolling bearing mechanism 5 is configured by a combination of two deep groove ball bearings 5a and 5a, and the other rolling bearing mechanism 5 includes one deep groove ball bearing 5a and The one constituted by a combination of one tapered roller bearing 5c is arranged.
According to the present embodiment, it is preferable in order to improve the durability against the thrust force.
Further, since each of the two rolling bearing mechanisms has one deep groove ball bearing, the durability against the thrust force is not significantly impaired, and the rolling bearing mechanism can be used at a higher speed.
The number of bearing arrangements of the two rolling bearing mechanisms 5 and 5 is not particularly limited as long as it is a combination of two or more, respectively. The design may be arbitrarily changed.
Also, the combination of the types of bearings can be changed within the scope of the present invention.

In the first to third embodiments, the tapered roller bearing 5c is employed as an example of the bearing that constitutes the rolling bearing mechanism 5. However, by employing the tapered roller bearing 5c in the present invention, the following operation is achieved. It may be effective.
For example, if a tapered roller bearing 5c having the same size as the deep groove ball bearing 5a is used, the thrust load capacity of the tapered roller bearing 5c is larger than the thrust load capacity of the deep groove ball bearing 5a. Even in such a case, the number of columns is smaller than that, and the effect that the device can be reduced in size can be expected.
In general, in the case of the same size, the tapered roller bearing 5c has a larger torque related to the rotation than the deep groove ball bearing 5a, but the same level of torque can be obtained by reducing the number of rows.

The principal part schematic of this invention turbocompressor. The schematic diagram which expands and shows the bearing mechanism part in FIG. 1 is a schematic diagram of a bearing mechanism in Embodiment 1. FIG. 1 is a schematic diagram of a bearing mechanism in Embodiment 1. FIG. 1 is a schematic diagram of a bearing mechanism in Embodiment 1. FIG. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 2. FIG. 6 is a schematic diagram of a bearing mechanism in Embodiment 3.

Explanation of symbols

3 Speed increasing mechanism 4 Rotating shaft 4a Compression blade 5 Rolling bearing mechanism

Claims (7)

In a turbo compressor of a type in which a shaft to which a compression blade is attached is rotatably supported by a rolling bearing mechanism arranged at a position separated in the axial direction.
A turbo compressor characterized in that the rolling bearing mechanism is formed of any one of a deep groove ball bearing, a tapered roller bearing, and a cylindrical roller bearing. The turbo compressor according to claim 1, further comprising a mechanism for accelerating the impeller shaft through a speed increasing mechanism. 3. The turbo compressor according to claim 2, wherein at least one of the rolling bearing mechanisms disposed at positions separated in the axial direction includes a tapered roller bearing or a deep groove ball bearing. 4. The turbo compressor according to claim 3, wherein at least one of the rolling bearing mechanisms arranged at positions separated in the axial direction is a bearing mechanism in which two or more rolling bearings are combined. The turbo compressor according to claim 4, wherein the rolling bearing mechanism disposed at a position separated in the axial direction is a bearing mechanism in which two or more rolling bearings are combined. 6. The turbo compressor according to claim 5, wherein each of the rolling bearing mechanisms arranged at positions separated in the axial direction has one or more deep groove ball bearings. In a turbo compressor of a type in which a shaft to which a compression blade is attached is rotatably supported by a rolling bearing mechanism arranged at a position separated in the axial direction.
A turbocompressor characterized in that a rolling element of a bearing constituting the rolling bearing mechanism is made of ceramic.

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