JPH04128591A - Sealed rotary compressor - Google Patents

Abstract

PURPOSE:To improve lubrication and prevent the failure of an electric element by forming an oil shielding tube provided in a space between the coil end inner periphery of the electric element and the lower end section of a rotor with an electric insulating material, and fixing it to a discharge muffler via the elasticity of the oil shielding tube itself. CONSTITUTION:A discharge muffler 28, which is fixed with bolts to a frame 10 fixed at the upper section of the cylinder 9 of a compression element 5, is fixed so that the end section 30 of the discharge muffler 28 is located on the outer periphery of the flange section 19 of the frame 10, and an oil shielding tube 31 molded with an electric insulating material is inserted by utilizing this end section 30. The oil shielding tube 31 is hooked on the end section of the discharge muffler 28 to be fixed by utilizing the expansion of the inner diameter of the oil shielding tube 31 by the elastic opening and closing of a vertical notch 32 provided on the oil shielding tube 31. The lubricant quantity discharged to the outside of a compressor is reduced when the compressor is started and operated, and the burning of the electric element 4 is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention relates to a hermetic rotary compressor used in refrigeration or air-conditioning equipment, and particularly relates to a lubricating oil impregnated by discharge pressure fluid and rotation of a rotor. This relates to a function that prevents the occurrence of agitation. [Prior art] In a hermetic rotary electric compressor used for cooling and freezing,
As the amount of refrigerant sealed in the refrigerant circuit increases with the increase in output capacity, the amount of lubricating oil that is carried out of the compressor and circulated through the refrigerant circuit increases, which inevitably increases the amount of lubricating oil inside the compressor. The amount of lubricating oil stored in the compressor element decreases, resulting in insufficient oil supply to the compression element, which accelerates its wear. Furthermore, in order to maintain performance such as volumetric efficiency of the nine-rotation electric compressor, it is necessary to fill the gaps between the sliding parts of the compression element with lubricating oil. Therefore, it is necessary to increase the amount of lubricating oil sealed and to maintain the oil level with respect to the compression element during steady operation of the compressor.

However, simply increasing the amount of lubricating oil can be achieved by increasing the bottom of the closed container; however, as mentioned above, the amount of circulating lubricating oil also increases.

The oil level may drop and reduce compressor performance. In addition, if the initial amount of lubricating oil is simply increased, the compression element and the electric element will be engulfed in the lubricant, resulting in agitation of the lubricant by the rotation of the two rotors and a discharge port for discharging compressed gas from the compression element into the sealed container. When the compressor is below the oil level, compressed gas containing more lubricant than the allowable amount of refrigerant is discharged during startup or operation of the compressor, making the refrigerant circuit unstable. There is a drawback that the required characteristics cannot be exhibited.

Therefore, conventional efforts have been made to eliminate the above drawbacks.

For example, Publication of Utility Model Publication No. 58-30142, Publication of Utility Model Publication No. 58-30142
A hermetic rotary compressor described in Japanese Patent No. 111380 was considered.

The conventional hermetic compressor described in Japanese Utility Model Publication No. 58-30142 is as shown in Fig. 8, and in Fig. 1,
(1) is an airtight container composed of an upper shell (2) and a lower shell (3), and inside the airtight container (1) there is an electric element (4) in the upper part and a compression element (5) in the lower part. are stored in each. The electric element (4) includes a stator (6) fixed to a closed container (1), a rotor (7) fitted to the stator (6), and a crankshaft (1) fixed to the rotor (7). 8) extends downward. Compression element (5)
is a cylinder (9) fixed to a closed container f+, );
Frame α1 fixed above and below the cylinder (9) with
and a cylinder head 01. The crankshaft (8) is pivotally supported by the frame 0α and the cylinder head a1, and has an eccentric part in the cylinder (9), into which a rolling piston υ is fitted, and the rotor (7)
It is designed to be driven by Further, the cylinder head Qll is provided with a discharge boat 03 that communicates with the inside of the cylinder (9), and the boat 03 is opened and closed.
A discharge valve α4 consisting of a square meter is attached, and a discharge muffler (c) that airtightly covers the Norinder Rad 0]) is fixed. The discharge boat (to) connects gas holes αG, Qη, and (to) formed in the internal space of the head cover (to), the cylinder head 0, the cylinder (9), and the frame +1, respectively, through the discharge valve α. A discharge gas flow consisting of

connected to the road.

The lower end of a substantially cylindrical oil-shielding tube is airtightly fitted and fixed to the lower flange 09 of the frame α1, and the upper end of the oil-shielding tube 1 is connected to the lower end of the rotor (7) of the electric element (4). The oil shielding cylinder (1) is loosely inserted into the full opening formed between the end ring Q°C and the balance weight (A) provided in the stator (6) and the lower coil end of the stator (6). The top end of is open. There is an air gap (c) between the stator (6) and rotor (7).
is formed, and the rotor (7) is formed with a gas hole),
Air gap (c) inside the oil shielding cylinder ■ from the gas hole side of frame H.

A discharge gas passage is formed that reaches above the electric element (4) through the gas hole (A). A discharge pipe is provided on the earthen wall of the upper nonyl (2), and a portion of the lower part of the lower shell (3) corresponding to the compression element (5) is filled with lubricating oil.

Next, the operation of the compressor configured as above will be explained. The refrigerant gas compressed in the cylinder (9) of the compression element (5) pushes up the discharge valve a411 from the discharge boat (to), fills the internal space of the head cover, and enters the gas hole aO.
, a force, (to) is led to the space consisting of frame a1 and oil shielding cylinder (to), and some of the gas from the space goes through the gas hole (c), and the remaining gas goes through the air gap. It passes through each of the pipes, reaches the upper part of the closed container (1), and is discharged from the discharge pipe to the outside of the compressor. Also, frame α0. The bearings of the cylinder head α1 and the rolling piston 0 are supplied with lubricating oil to smooth their sliding movements, and the rolling piston (2), the frame α1, and the cylinder head 0 Even in the gaps between.

Lubricating oil is supplied to keep the piston (1) sliding smoothly and to form an oil film that keeps the compression chamber airtight.

In addition, even if the oil level in the lubricating oil tank rises near the lower end surface of the rotor (7), the rotation of the rotor (7) causes the lubricating oil (
b) The lubricating oil level is maintained without stirring, and as described above, the lubricating oil amount is supplied to the compression element (5) for sliding movement and oil film formation. Note that in FIG. 8, the flow of refrigerant gas discharged from the compression element (5) is indicated by arrows.

Furthermore, FIG. 9 is a diagram showing a hermetic rotary compressor described in Utility Model Application Publication No. 58-111380, and is the same as FIG. 8.
The corresponding part (explanation will be omitted) is a discharge muffler fixed to the frame αa in contact with the lower coil end of the electric element (4). The discharge muffler @ is integrally molded with the electrical insulating material (not shown) of the coil end (c) and must be compressed so that it comes into contact with the amount of electrical insulating material formed in the Electric element (
4) is placed in a closed container (1).

The conventional example shown in FIG. 9 also has the same effect as the case described in FIG. The discharge pressure fluid shown by the arrow does not stir the lubricating oil surface, and the balance weight b attached to the lower end surface of the rotor
By rotating υ, the amount of lubricating oil carried out of the compressor together with the refrigerant gas from the discharge pipe (E) can be reduced without disturbing the lubricating oil, and as a result, the amount of lubricating oil taken out of the compressor together with the refrigerant gas can be reduced. Lubricating oil is supplied to the bearings of the cylinder head 0 and the rolling piston 2 to smooth their sliding movements, and is also supplied to the gaps between these parts to ensure the airtightness of the compression chamber. An oil film is formed that retains the

[Problem to be solved by the invention]

In conventional hermetic rotary compressors, measures have been taken using the above two methods to reduce the amount of lubricating oil carried out to the outside of the compressor during startup and operation. In the case of the first conventional example, since the oil shielding cylinder is press-fitted into the frame and installed on the frame, the oil shielding cylinder must be formed of a metal material in order to maintain the fixing strength. This is because the coil end, which is just a bundle of wires, cannot perform sufficient dimensional control; therefore, it is necessary to loosely insert an oil shielding tube made of metallic material inside the coil end when starting the compressor. Or vibration during operation,
Alternatively, the jet gas and (,
2. If the oil shield tube is deflected or unfixed due to contact with the coil end, and the coil end is damaged, the insulation of the electric element is insufficient.

There is a risk of short-circuiting and ignition within the compressor.

In addition, the risk of the oil shield cylinder coming into contact with the coil end also exists in the compressor manufacturing process.
It is a common problem that the metal oil shielding tube damages the coil end when inserting the coil.

In addition, in the case of the second conventional example, in order to eliminate the risk of short-circuiting of the electric element due to damage to the coil end, or even ignition of the electric element, an electrical insulating material is provided at the contact part between the discharge muffler and the coil end. However, as shown in Figure 9, there must be an air gap (c) between the stator and rotor of the electric element, and the coil end of the electric element and the discharge muffler must be in contact with each other to ensure a sealed component. Storing it inside is
The compressor is manufactured by combining the compression element and the electric element, so in order to maintain a precise air gap, the individual compressor parts, such as the external dimensions of the coil end and the dimensions of the discharge muffler, must be adjusted. Must be strictly controlled1
Additionally, in the compressor manufacturing process, bringing the coil end into contact with the discharge muffler restricts the degree of freedom in assembling the compression element, posing problems such as the need to carefully and strictly check the air gear etc. .

The invention was made to solve the above problems, and aims to reduce the amount of lubricating oil taken out of the compressor when starting and operating the compressor, and to prevent burnout of electric elements. The purpose is to obtain a hermetic rotary compressor that can.

[Means for Solving the Eighth Patent Application] The invention of the nail described in claim 1 is such that the oil shielding cylinder is formed of an electrically insulating material, and the upper end of the oil shielding cylinder is provided without contacting the coil end of the electric element. It is fixed to the discharge muffler by its own elasticity before oil shielding.

In the invention as claimed in claim 2, the oil shielding cylinder is formed of an electrically insulating material, the upper end of the oil shielding cylinder is provided without contacting the coil end of the electric element, and the oil shielding cylinder is formed by the spring elastic force of the stopper. It is fixed to the discharge muffler.

[Effect]

In the invention as claimed in claim 1, the oil shielding tube is formed of an electrically insulating material, the upper end of the oil shielding tube is provided without contacting the coil end of the electric element, and the elasticity of the oil shielding tube itself prevents the discharge muffler. By fixing the
! I' absorbs the vibration of the oil shield cylinder during operation, and even if the coil end and oil shield cylinder come into contact, 'I' will not cause a short circuit of the moving element or ignition.

According to the second aspect of the invention, the oil shielding cylinder is fixed to the υ discharge muffler by the spring elastic force of the stopper, so that the oil shielding cylinder is easily fixed to the discharge muffler.

〔Example〕

A first embodiment of the invention will be described below with reference to FIGS. 1 to 4. The explanation of the upper part of FIG. 8, which is a conventional example, is omitted. @ is a discharge muffler fixed to the frame aB by bolts, and the discharge muffler @ is attached to the outer peripheral surface of the flange portion α9 of the frame αa. The end of the discharge muffler is fixed in position, and using the end button, 1! Qi P2
The oil shield vlO]) molded from the edge material is installed in such a way that it fits. As shown in the perspective view of Fig. 2 and Figs. 3 and 4, the oil shield cylinder Gll is fixed to the oil shield
il has a notch ω in the vertical direction, and by using the widening of the inner diameter of the notch to prevent oil shielding by elastically opening and closing the notch, the discharge muffler (To) and the oil shield cylinder C311 are fixed. Furthermore, on the inner surface of the oil shielding cylinder 011, there is a protrusion (
2 over the entire circumference.

In addition, by using these oil shielding joints and injection moldable electrical insulating material, it is possible to perform W production without performing any machining.

In addition, from Fig. 2 to Fig. 4, when fixing the oil shielding cylinder to the discharge muffler, the direction in which the oil shielding cylinder expands is (i), and the direction in which it closes is (
M).

Next, the operation will be explained.

The refrigerant gas compressed in the cylinder (9) of the compression element (5) pushes up the discharge valve 0 from the discharge boat a3, fills the internal space of the cylinder head side discharge muffler, and flows through the gas hole Qd.
, α ri, (to), it is led to the entire structure consisting of the frame side discharge muffler head, oil shielding tube C (υ), and the rotor (the lower end surface of the sword and the balance weight b), and a part from the space between Gas enters the gas hole (A).

The remaining gas passes through each air gap (2) and reaches the upper part of the closed container, and is discharged from the discharge pipe (A) to the outside of the compressor. In addition, a quantity of lubricating oil is supplied to the bearings of the frame αa, cylinder head 0, and rolling piston ■ in order to smooth their sliding movements. Lubricating oil is also supplied to the gap between the rolling piston 0 and the rolling piston 4 to keep the sliding movement of the rolling piston 0 smooth and to form an oil film to keep the compressor airtight.

Therefore, even if the lubricating oil level inside the compressor rises when the compressor is started or operating, the lubricating oil level is stirred by the refrigerant gas discharged from the compression element and carried out to the outside of the sealed container by the refrigerant gas. A stable lubricating oil level can be secured without increasing the amount of lubricating oil, and the lubrication fv! Similar agitation of the oil surface and lubricating oil can also be suppressed.

Moreover, as shown in Figs. 2 to 4, by fixing the oil shielding tube cit+ to the frame side discharge muffler using its own elastic force, the oil shielding tube 0D due to compressor operation and discharged jet gas. As a result, it is not only possible to prevent the oil shield cylinder Gl) from falling from the discharge muffler (c), but also when the compressor is started or operated. L< means that even if the oil shielding tube 311 were to come into contact with the coil end (to) during the compressor manufacturing process, since the oil shielding tube 09 was molded with electrically insulating material, the coil end (to) It is possible to prevent short-circuiting and fire of the electric element αφ due to damage to the compressor without damaging the compressor, and it is possible to obtain a compressor with high reliability not only in lubrication performance but also in mechanical operation. It is a station.

Further, in the second embodiment of the invention of FIG. 5, the method and structure of fixing the oil shield cylinder is shown in a perspective view. In addition, sectional views of essential parts of the oil shield @knot fixing part in the second example are shown in FIGS. 6 and 7.

In the case of the example, multiple long holes 1 (
On the other hand, the discharge muffler ■ is provided with the same number of long and large 2 cans corresponding to approximately the same position as the original long hole 1, and these long holes 1
．． 1. The oil shielding tube is fixed to the discharge muffler using the spring elastic force of the stopper. In addition, stopper G with
By providing a groove in the oil-shielding cylinder, the portion 71 that does not have a convex portion is inserted into the groove, and has the effect of assisting in positioning the stopper Gη and preventing the stopper from falling.

Figure 6 shows the groove when the oil shield node is fixed to the discharge muffler.
FIG. 7 shows a cross section of the convex portion.

The second embodiment can also have the same effects as the first embodiment. Note that the first and second embodiments can exhibit similar effects not only in a vertical compressor but also in a horizontal compressor.

〔Effect of the invention〕

According to the invention as set forth in claim 1, the oil shield cylinder is formed of an elastic electrical insulating material and is fixed to the discharge muffler without contacting the coil end.

It is possible to obtain a highly reliable compressor that has good lubricity and does not cause defects in electric elements. However, since the oil shielding tube can be manufactured by injection molding, it can be produced at low cost, and the above-mentioned compressor can be obtained with almost no changes to the conventional machining process or machining accuracy. According to the invention recited in claim 2, the oil shielding cylinder is fixed to the discharge muffler by the spring elastic force of the stopper, so it can be fixed easily and manufactured, and is inexpensive and has stable quality. This has the effect of obtaining highly reliable products.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a hermetic rotary compressor according to the first embodiment of the invention, Fig. 2 is a perspective view showing the oil shield cylinder and discharge muffler of Fig. 1, and Figs. 3 and 4 are 1 is a cross-sectional view showing the elastic state of the oil shielding joint itself, FIG. 5 is a perspective view showing the oil shielding tube, discharge muffler, and stopper according to the second embodiment of the invention, and FIGS. 6 and 7 are 8 is a sectional view showing the first conventional example C' hermetic rotary compressor, and FIG. 9 is a sectional view of the second conventional example C' hermetic rotary compressor. FIG. (1) is a closed container, (4) is an electric element, (5) is a compression element, (7) is a rotor, (9) is a cylinder, ! IQ is a frame. α sword is cylinder head, ■ is rolling piston, (
) is the coil end, 011 is the oil shield node, and On is the stopper. In the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) The electric element and the compression element are integrally connected and housed in a closed container, and the compression element includes a rolling piston that rotates eccentrically within the cylinder, a frame that closes both end surfaces of the cylinder to form a cylinder chamber, and A closed type rotary compression having a cylinder header, a discharge muffler provided at the upper part of the frame, and an oil shield cylinder provided in a space formed by the inner periphery of the coil end of the electric element and the lower end of the rotor. In the machine, an oil shielding cylinder is formed of electrically insulating material,
A hermetic rotary compressor characterized in that the upper end of the oil shielding tube is provided without contacting the coil end of the electric element, and is fixed to the discharge muffler by the elasticity of the oil shielding tube itself. (2) The electric element and the compression element are integrally connected and housed in a sealed container, and the compression element includes a rolling piston that eccentrically rotates inside the cylinder and a frame that closes both end surfaces of the cylinder to form a cylinder chamber. and a cylinder head, a discharge muffler provided at the top of the frame, and an oil shielding tube provided in a space formed by the inner periphery of the coil end of the electric element and the lower end of the rotor. In the compressor, an oil shielding tube is formed of electrically insulating material,
A hermetic rotary compressor, characterized in that the upper end of the oil shield cylinder is provided without contacting the coil end of the electric element, and the oil shield cylinder is fixed to the discharge muffler by the spring elastic force of a stopper.