JP2506174B2 - Vertical rotary compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical rotary compressor, and in particular, prevents resonance of a rotary shaft system during high-speed rotation, and further discharges refrigerating machine oil to the outside of the compressor. The present invention relates to a vertical rotary compressor suitable for prevention.

[Prior Art] A conventional vertical rotary compressor will be described with reference to FIG.

FIG. 10 is a vertical sectional view of a conventional vertical rotary compressor.

The vertical rotary compressor shown in FIG. 10 has a compression mechanism section 2 arranged in the lower part of a closed container 1, an electric motor section composed of a stator 3 and a rotor 4 arranged in the upper part thereof, and the rotor 4 has a rotating shaft 5 Is fitted to. The rotary shaft 5 has an eccentric portion 5a, and a roller 6 is rotatably fitted to the eccentric portion 5a. The roller 6 is configured to eccentrically rotate in a cylinder 7 as the rotary shaft 5 rotates. ing.

The upper bearing 8 is on the upper surface of the cylinder 7, and the lower bearing 9 is on the lower surface.
Is provided for supporting the rotating shaft 5 and forming a compression chamber in the cylinder 7.

The rotor 4 is composed of an iron core 10, an end ring 12, etc., and there is a rotor 4 equipped with a permanent magnet 11 on the outer side thereof. There is also an example in which a through hole 13 is formed in the iron core 10 so as to pass through the iron core 10 from above and below.

An example of forming the through hole 13 is, for example, the actual open sho 48-3040.
The techniques described in JP-A-7, JP-A-48-75205 and JP-A-60-45888 are known. Among the above three examples, the through holes described in Japanese Utility Model Laid-Open Nos. 48-30407 and 48-75205 are used as holes for passing a refrigerant gas. The through holes described are provided for the purpose of lubricating the upper bearing when assembling the compressor.
In any of the examples, the through hole is not provided for the purpose of reducing the weight of the rotor.

In the vertical rotary compressor shown in FIG. 10, the refrigerant gas is compressed by the compression mechanism section 2 and then discharged through the discharge valve (not shown) and the silencer chamber 14 below the electric motor section. Further, the refrigerant gas is the clearance between the stator 3 and the closed container 1, the clearance between the stator 3 and the rotor 4, or the through hole 13
Through the discharge pipe 15 to the outside of the compressor. Here, the refrigerating machine oil 16 is stored at the bottom of the closed container 1, but the refrigerating machine oil is mixed and atomized with the refrigerant gas due to foaming of the refrigerant gas dissolved in the refrigerating machine oil 16 and the stirring action of the rotor 4. In this state, it is wiped up above the electric motor section and discharged from the discharge pipe 15 to the outside of the compressor.

Here, the amount of refrigerating machine oil discharged to the outside of the compressor is related to the reliability of the compressor and the performance of the refrigerating machine connected to the compressor. That is, if the amount of refrigerating machine oil discharged to the outside of the compressor increases, the refrigerating machine oil stored in the bottom of the closed container 1 may decrease and lubrication to the bearing may become insufficient. Also,
Due to the refrigerating machine oil adhering to the inside of the heat exchanger constituting the refrigerating machine, the heat-penetrating rate of the heat exchanger is lowered and the capacity of the refrigerator is lowered.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, particularly when the compressor is used at high speed, the operating frequency and the eigenvalue of the shaft system composed of the rotating shaft and the rotor come close to each other, so that the resonance region may be reached. In this case, the whirling amount of the rotary shaft increases and the local load applied to the upper bearing and the lower bearing increases, so that the reliability of the bearing decreases.

In order to increase the eigenvalue of the shaft system, it is necessary to reduce the size and weight of the rotor and lower the fixed position of the rotor.However, if the size of the rotor is reduced, the performance of the motor will deteriorate, and the fixed rotor If the upper bearing is shortened in order to lower the position, the decrease in reliability becomes a problem.

Further, as shown in the above-mentioned conventional example, when a hole penetrating up and down the rotor is formed, the refrigerant and the refrigerating machine oil discharged while being rotated from the lower part of the through hole to the upper part have a clearance between the stator and the closed container. , And the refrigerant and the refrigerating machine oil discharged through the gap between the stator and the rotor are mixed above the electric motor section, so that the refrigerating machine oil is atomized and the amount of refrigerating machine oil discharged to the outside of the compressor increases. However, there is a problem that the capacity of the refrigerator decreases.

Further, there is a problem that a refrigerant gas sound discharged from the through hole is generated.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and the eigenvalue of the shaft system can be increased without lowering the performance of the electric motor and the reliability of the bearing, and further discharged to the outside of the compressor. To provide a vertical rotary compressor that can reduce the amount of refrigerating machine oil and improve the performance of the refrigerating machine.
That is the purpose.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the vertical rotary compressor according to the present invention is such that a compression mechanism portion is provided in a lower portion in a hermetic container.
In a vertical rotary compressor that accommodates an electric motor section consisting of a stator and a rotor composed of at least an iron core and an end ring in the upper part, the iron core of the rotor is provided with a plurality of cavities that penetrate the entire length of the iron core. The upper end of this cavity is closed and the lower end is opened to the outside of the rotor.

[Operation] The operation of the above technical means is as follows.

Since the cavity formed in the iron core of the rotor can reduce the rotor mass without deteriorating the performance of the rotor, the eigenvalue of the shaft system can be increased and the reliability can be ensured.

Further, if the upper end of the hollow portion of the rotor is closed, the refrigerant and the refrigerating machine oil discharged through the hollow portion to the upper side of the electric motor section are blocked, so that the amount of refrigerating machine oil discharged to the outside of the compressor is reduced. It can be reduced and the performance of the refrigerator can be improved.

Further, by opening the lower end of the hollow portion of the rotor, air remaining in the hollow portion can be completely removed by vacuuming when the compressor is assembled, and reliability of the compressor and the refrigerator is not deteriorated. .

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 to 9.

FIG. 1 is a longitudinal sectional view according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a weight ratio of a stator in the apparatus of FIG. Fig. 4 shows the relationship between the fixed value of the shaft system and the ratio of the fixed value of the shaft system. Fig. 4 shows the discharge force of the refrigerating machine oil to the outside of the compressor and the EER of the refrigerating machine when the upper end of the cavity is closed and not closed. It is a diagram which shows the relationship with.

In FIG. 1, the same reference numerals as those in FIG. 10 are equivalent to those of the prior art, and the compression mechanism part is the same as that of the conventional example, so the description thereof will be omitted.

In the vertical rotary compressor shown in FIG. 1, the rotor 4 of the electric motor includes an iron core 10 and a permanent magnet 1 arranged outside the iron core 10.
1 and end ring 12 etc.

The iron core 10 is provided with a hollow portion 17 that penetrates the iron core 10 from above and below, and the upper end of the iron core 10 closes the hollow portion 17 and the space above the rotor with a closing plate 18. Further, the lower end of the hollow portion 17 is structured to communicate with the space below the rotor 4.

As shown in FIG. 2, the hollow portion 17 has a plurality of spaces arranged substantially on the circumference inside the iron core 10. By connecting the inside and the outside of the hollow portion with ribs 19, It has a structure in which it is partitioned into a plurality of cavities 17 while ensuring strength.

In this embodiment, the relationship between the weight ratio of the stator and the eigenvalue of the shaft system when the volume of the cavity 17 is changed is shown in FIG. 3 with the former as the horizontal axis and the latter as the vertical axis.

As shown in Fig. 3, the weight ratio of the stator is 0.85
By setting it to 85%, the eigenvalue of the shaft system can be increased by 8%. In this case, the allowable rotational speed of the compressor that reaches the resonance region of the shaft system and the shaft starts to resonate can be increased by 8%.

Further, in FIG. 4, the horizontal axis shows the case where the upper end of the hollow portion 17 is not closed and the case where it is closed, and the vertical axis is the amount of refrigerating machine oil discharged to the outside of the compressor and the energy efficiency ratio of the refrigerating machine. (Hereinafter referred to as EER).

As shown in FIG. 4, as a result of the experiment, by closing the upper end of the cavity 17, the discharge refrigerating machine oil amount can be reduced to 65%,
It was found that the EER of the refrigerator can be increased by 2.4%.

By the way, contrary to the present embodiment, when closing the lower end of the cavity 17 and opening the upper end, refrigerating machine oil is stored or scattered in the cavity, and the refrigerating machine oil discharge amount varies, The structure of this embodiment, in which the upper end of the cavity is closed and the lower end is opened, is superior because of the problem of scattering noise.

 According to this embodiment, there are the following effects.

(1) Since the amount of refrigerating machine oil discharged to the outside of the compressor can be reduced, the amount of residual refrigerating machine oil inside the compressor can be increased to increase reliability and improve the performance of the refrigerator. There is an effect that the heat exchanger of the refrigerator can be miniaturized to miniaturize the entire refrigerator.

(2) Since the eigenvalue of the shaft system can be increased without deteriorating the reliability of the bearing and the performance of the electric motor, the operating frequency of the compressor can be increased by the increase of the eigenvalue of the shaft system, and the refrigerating capacity can be increased. Since a compressor that is larger than the main compressor can be replaced with the main compressor, there is an effect that the refrigerator can be downsized.

(3) By closing the upper end of the hollow portion provided in the iron core, it is possible to avoid the problem of refrigerant gas noise discharged from the upper end of the hollow portion to the upper portion of the electric motor, and to reduce noise.

Next, FIG. 5 is a vertical cross-sectional view of a rotor portion of a vertical rotary compressor according to another embodiment of the present invention, in which the same reference numerals as those in FIG. 1 denote the same parts as those in the previous embodiment. Indicates. The compression mechanism portion and others not shown are the same as those in FIG.

The rotor 4A shown in FIG. 5 includes an iron core 10, a permanent magnet 11, an upper end ring 12A, a lower end ring 12 and the like. The iron core 10 is formed with a plurality of hollow portions 17 penetrating above and below the iron core, and the upper end of the hollow portion 17 has an end ring 12
It is closed by A, and the lower end communicates with the space below the rotor.

According to the embodiment of FIG. 5, the same effect as that of the embodiment of FIG. 1 can be expected.

Next, FIG. 6 is a vertical cross-sectional view of a rotor portion of a vertical rotary compressor according to still another embodiment of the present invention. In the drawing, the same reference numerals as those in FIG. The compression mechanism and others are the same as those in FIG.

The rotor 4B shown in FIG. 6 has a bush 20 that closes the hollow portions 17 at the upper ends of the hollow portions 17 provided in the iron core 10.
It is configured to be inserted and fixed. Materials suitable for the bush 20 include metals such as iron, aluminum, zinc, and brass, or resins exhibiting refrigerant resistance, and as a fixing method, press fitting or fixing with an adhesive is suitable.

According to the embodiment shown in FIG. 6, the same effect as that of the embodiment shown in FIG. 1 can be expected.

Next, FIG. 7 is a vertical sectional view of a rotor portion of a vertical rotary compressor according to still another embodiment of the present invention, and FIG. 8 is a sectional view taken along the line BB of FIG. The figure is a diagram showing the relationship between the cross-sectional area ratio of the small holes and the cavity and the refrigerator discharge amount to the outside of the compressor in the embodiment of FIG. In the figure, those having the same reference numerals as those in FIG. 1 indicate the same parts, and the compression mechanism portion and others not shown are the same as those in FIG.

In the iron core 10A of the rotor 4C shown in FIG. 7, the cavity 17 shown in each of the above-described embodiments is provided so that the upper end is closed by the closing plate 18 and the lower end is opened, and the core 17A is penetrated vertically above and below the iron core 10A. A plurality of (two in FIG. 8) small holes 21 are opened to the outside of the rotor 4C.

The small hole 21 is provided for the purpose of oiling the upper bearing 5 (see FIG. 1) when assembling the compressor, and the small hole 21 has a cross-sectional area of 5% or less of the cross-sectional area of the cavity 17. It is set to be.

In FIG. 9, the horizontal axis indicates the small hole 21 with respect to the cross-sectional area of the cavity 17.
The experimental results are shown by taking the ratio (%) of the cross-sectional area of the cavity and the ratio of the discharge amount of the refrigerating machine oil to the outside of the compressor on the vertical axis. It is clear that when the amount is 5% or less, the discharge amount of refrigerating machine oil is not affected.

According to the embodiment shown in FIGS. 7 and 8, the same effect as that of the embodiment shown in FIG. 1 can be expected, and in addition, the present embodiment allows the upper bearing to be lubricated when the compressor is assembled. It has a unique effect.

In each of the above embodiments, a permanent magnet is provided outside the iron core 10.
Although the rotor having the configuration equipped with 11 is illustrated, the present invention is not limited to this, and it is needless to say that the present invention can be applied to a rotor having no permanent magnet on the outside of the iron core.

[Effects of the Invention] As described above, according to the present invention, the eigenvalue of the shaft system can be increased without lowering the performance of the electric motor and the reliability of the bearing, and the amount of refrigerating machine oil discharged to the outside of the compressor can be increased. Therefore, it is possible to provide a vertical rotary compressor that can improve the performance of the refrigerator.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a weight ratio of a stator in the apparatus of FIG. Fig. 4 shows the relationship between the fixed value of the shaft system and the ratio of the fixed value of the shaft system. Fig. 4 shows the discharge force of the refrigerating machine oil to the outside of the compressor and the EER of the refrigerating machine when the upper end of the cavity is closed and not closed. FIG. 5 is a longitudinal sectional view of a rotor portion of a vertical rotary compressor according to another embodiment of the present invention, and FIG. 6 is a still another embodiment of the present invention. FIG. 7 is a vertical sectional view of a rotor portion of a vertical rotary compressor, FIG. 7 is a vertical sectional view of a rotor portion of a vertical rotary compressor according to still another embodiment of the present invention, and FIG. 9 is a sectional view taken along the line BB, FIG. 9 is a diagram showing the relationship between the sectional area ratio of the small holes and the cavity and the refrigerating machine oil discharge amount to the outside of the compressor in the embodiment of FIG. 7, FIG. Is traditional It is a longitudinal sectional view of a vertical rotary compressor. 1 ... airtight container, 2 ... compression mechanism part, 3 ... stator, 4,
4A, 4B, 4C ... Rotor, 10,10A ... Iron core, 12 ... End ring, 17 ... Cavity, 18 ... Occlusion plate, 19 ... Rib, 20 ...
... Bush, 21 ... small hole.

Claims (3)

(57) [Claims] 1. A vertical rotary compressor in which a compressor unit is housed in a lower portion of an airtight container and an electric motor unit composed of a stator and a rotor composed of at least an iron core and an end ring is housed in an upper portion thereof. A vertical rotary compressor characterized in that an iron core is provided with a plurality of hollow portions penetrating the entire length of the iron core, an upper end portion of the hollow portion is closed, and a lower end portion is opened to the outside of the rotor. 2. A vertical rotary compressor in which a compressor unit is housed in a lower portion of an airtight container and an electric motor unit composed of a stator and a rotor composed of at least an iron core and an end ring is housed in an upper portion of the rotor. The iron core is provided with a plurality of hollow portions penetrating the entire length of the core, the upper end of the hollow portion is closed, the lower end is opened to the outside of the rotor, and a plurality of small holes penetrating the entire length of the iron core. A vertical rotary compressor characterized by being perforated. 3. The cavities according to claim 1 or 2, wherein a plurality of cavities are arranged substantially on the circumference, and a plurality of ribs are provided to connect the inside and the outside of the cavities. Vertical rotary compressor characterized by being divided into.