JPS58176491A - Rotary type compressor equipped with plural cylinders - Google Patents

Abstract

PURPOSE:To improve the lubricating property of the rotary compressor equipped with a plurality of cylinders by a method wherein a main crank shaft, rotating a rotor nearest to a motor, is connected to the motor directly and an oil pump is provided at the lower end of this main crank shaft. CONSTITUTION:The oil pump 33 is provided with a suction port 33a at the lower end thereof and is inserted into the lower end of the main crank shaft 4. An auxiliary crank shaft is bored with a hole 34 therein for the oil pump and is hollow. The oil pump 33 penetrates the hole 34 for the oil pump, rotates freely in the auxiliary crank shaft 16A and the suction port 33a therefor is opened at the bottom of an enclosed vessel 1, therefore, the lubricating property of the rotary compressor equipped with a plurality of cylinders may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-cylinder rotary compressor, and more particularly to a multi-cylinder rotary compressor intended to improve its lubrication state.

First, a conventional multiple cylinder rotary compressor will be explained.

FIG. 1 is a sectional view showing an example of a conventional multi-ring rotary compressor, and FIG. 2 is an enlarged sectional view showing details around the oil pump in FIG.

This multi-cylinder rotary compressor can be roughly divided into the following three elements depending on their functional differences.

One of them is rotor 2. A main compression element consisting of a motor that generates the shearing force from the stator 3, a main crankshaft 4, and a wide convex portion 15 provided on the end face of the main crankshaft, which is directly driven by the motor. , further comprising an auxiliary crankshaft 16 to a recess 27 provided on the end face of the auxiliary crankshaft and connected to the convex part to form a shaft joint, the auxiliary compression being driven by the main compression element by the shaft joint. is an element.

Reference numeral 1 denotes a closed container that houses the above three elements and seals the refrigerant gas to maintain a desired pressure; 28 is connected to the closed container 1, and the compressed refrigerant gas is transferred to a plurality of rotary cylinders. This is the discharge pipe that leads to the outside of the compressor.

To explain the main compression element, 4 is a main crankshaft that is directly connected to the rotor 2 of the motor and transmits the power of the motor to the main compression element.The main crankshaft 4 is shown in detail in FIG. As shown in a, a main crankshaft oil hole 4a is bored inside the main crankshaft oil hole 4a and is hollow, and the main crankshaft oil hole 4a communicates with the main crankshaft oil hole 4a at right angles to the main crankshaft oil hole 4a. 32 are drilled. 5'□ is the main crankshaft eccentric part of the main crankshaft 4, and 6 is the main cod/rotary shaft eccentric part 5.
The main roller rotates eccentrically around , 7 is the main cylinder, 8
9 is a main cylinder upper end face plate of the main cylinder 7; 9 is a main compression element upper bearing portion that is integrated with the main cylinder upper end face plate 8 and supports the rotor 2 of the motor and the rotating body of the main compression element; 1;
0 is a main cylinder lower end face plate of the main cylinder 7, 11 is a main compression element lower bearing part that is integrated with the main cylinder lower end face plate lO and supports the lower end of the main crankshaft 4, and 12 is a main cylinder opening to the main cylinder 7. A suction port 13 is a main suction pipe connected to the main suction port 12; 14 is a main discharge valve provided on the main cylinder lower end face plate 10 to prevent backflow of the refrigerant gas compressed in the main cylinder 7; 15 is a convex portion provided on the end surface of the main crankshaft 4 and forming a part of the n1-axis joint.

Further, to explain the auxiliary compression element, reference numeral 16 is an auxiliary crankshaft, and this auxiliary taranta shaft 16 has an oil-filled 4a inside the main shaft, as shown in detail in FIG. An auxiliary crankshaft oil filler 16a that communicates with the auxiliary crankshaft oil filler 16a is provided in a hollow shape, and an auxiliary crankshaft lubrication hole 31 is drilled at right angles to the auxiliary crankshaft oil filler 16a in communication with the auxiliary crankshaft oil filler 16a. . 17 is an auxiliary crankshaft eccentric portion of the auxiliary crankshaft 16; 18 is an auxiliary roller that rotates eccentrically around the auxiliary crankshaft eccentric portion 17; 19 is an auxiliary cylinder; and 20 is an auxiliary cylinder upper end plate of the auxiliary cylinder 19. , 21 is an auxiliary compression element upper bearing part that is integrated with the auxiliary cylinder upper end face plate 20 and supports the rotating body of the auxiliary compression element, 22 is an auxiliary cylinder lower end face plate of the auxiliary cylinder 19, and 23 is an auxiliary cylinder lower end face plate 22.
24 is an auxiliary suction port that opens into the auxiliary cylinder 19; 25 is an auxiliary suction pipe connected to the auxiliary suction port 24; 27 is an auxiliary discharge valve provided on the upper end face plate 20 of the auxiliary cylinder and completely prevents backflow of the refrigerant gas compressed in the auxiliary cylinder 19; auxiliary crankshaft 1
6, a convex portion 15 of the main crankshaft 4;
These are the four parts that form the shaft joint connected to the n. Reference numeral 29 denotes a parabolic oil pump that is fitted into the lower end of the auxiliary crankshaft 16 and has a suction port 29a'e at its lower end. A is
This is a curved surface of refrigerating machine oil, which is a lubricating oil for a multi-cylinder rotary compressor, stored at the bottom of a closed container 1.

The multi-cylinder rotary compressor configured as described above is lubricated by pumping the refrigerating machine oil with the oil pump 29.

That is, when the motor is driven to rotate the multi-cylinder rotary compressor, the oil pump 29 has a head H (m) expressed by the following equation.

H-(072g)(a2-r2) (m) -
(1) Here, the rotational angular velocity of the ω-2 auxiliary crankshaft 16 (
rad/s) g: Gravitational acceleration (m/SJ r: Inner radius of the suction port 29a of the oil pump 29 (m) R: Inner radius of the upper part of the oil pump 29 (m) This lift H is usually the same as that of the main crankshaft 4. The height is sufficient to reach the top, and the refrigerating machine oil is placed in the auxiliary crankshaft oil tank 1.
6a, ascends through the main crankshaft oil filler 4a, passes through the auxiliary crankshaft lubrication hole 31.degree. It lubricates the main crankshaft 4.

However, if there is a gap in the joint surface B of the shaft joint that connects the main crankshaft 4 and the auxiliary crankshaft 16, refrigeration oil will leak from this joint surface B and reach the main crankshaft lubrication hole 32. However, there was a problem in that the main compression element could not be lubricated.

The present invention eliminates the above-mentioned drawbacks of the prior art and prevents lubricating oil from leaking from the gap between the joint surfaces of the shaft joint, and all compression elements are sufficiently lubricated to maintain a good lubrication state. The objective is to provide a multi-cylinder rotary compressor that can.

The present invention is characterized by one motor, at least a cylinder, and a roller that rotates eccentrically within the cylinder.

a vane that divides the space inside the cylinder into two while contacting the roller; a crankshaft that rotates the roller; a bearing that supports the crankshaft; the cylinder, the roller;
A plurality of compression elements each having a cylinder end plate that maintains airtightness with a vane are stacked in a stack and stored in a sealed container, and the lubricating oil collected at the bottom of this sealed container is pumped up by an oil pump. In a multi-cylinder rotary compressor, the main crankshaft that rotates the roller of the main compression element closest to the motor is directly connected to the motor, and the lower end of the main crankshaft is lubricated with oil. In a multi-cylinder rotary compressor equipped with a pump.

More specifically, in order to ensure that all compression elements are sufficiently lubricated, an oil pump is installed on the main compression element that is directly driven by the motor, which is farthest from the refrigerant oil level, and the oil pump is installed directly on the main compression element that is directly driven by the motor. It is designed to pump up water.

FIG. 3 is a sectional view of a multiple cylinder rotary compressor according to an embodiment of the present invention, and FIG. 4 is an enlarged sectional view showing details around the oil pump in FIG. 3.

In each figure, the same numbers as in FIGS. 1 and 2 indicate the same parts. A conical oil pump 33 is fitted into the lower end of the main crankshaft 4 and has a suction port 33a at its lower end. 16A is a hollow auxiliary crankshaft in which an oil pump hole 34 is bored, as shown in FIG. The oil pump 33 passes through the oil pump hole 34 and can freely rotate within the auxiliary crankshaft 16A, and its suction port 33a is connected to the closed container 1.
It is open at the bottom.

Lubrication of the multi-cylinder rotary compressor of this embodiment configured as described above is carried out by pumping up the refrigerating machine with an oil pump 33.

That is, when the motor is driven to rotate the multi-cylinder rotary compressor, the oil pump 33 rotates integrally with the main crankshaft 4, and the refrigerating machine oil pumped up by the oil pump 33 is transferred to the oil pump 33. Main crankshaft 4 which is the mounting part
The oil directly and reliably reaches the lower end surface of the engine, and is further pushed upward from there, passing through the main crankshaft lubrication hole 32 to lubricate the main crankshaft 4.

Therefore, the leakage of refrigerating machine oil from the joint surface B of the shaft joint connecting the main crankshaft 4 and the auxiliary crankshaft 16, which has been a problem in the prior art, is completely solved.

Lubrication of the auxiliary compression element does not need to be carried out particularly actively, since the refrigerating machine oil supplied to the main compression element from the main crankshaft lubrication hole 32 also flows to the auxiliary compression element, but the configuration shown in FIG. That will make it more certain.

FIG. 5 is an enlarged sectional view showing details around the oil pump of a multiple cylinder rotary compressor according to another embodiment of the present invention.

In FIG. 5, the same parts as in FIG. 4 are designated by the same numbers. Reference numeral 35 designates a conical oil pump that is fitted into the lower end of the main crankshaft 4, has a suction port 35a at its lower end, and has a curved shaft 36 bored in the middle. 16B is an auxiliary crankshaft, and the auxiliary crankshaft 16B is hollow with an oil pump hole 34 drilled inside.
In the oil pump hole 34, an auxiliary cod/shaft lubrication hole 31 is provided at a position facing the curved length 36, and connected to the oil receiver groove 37.

With this configuration, the oil cannot be pumped up by the oil pump 35.
A portion of the refrigerating machine oil is scattered in the circumferential direction from an oil container 36 provided in the middle of the oil pump 35 due to centrifugal force. This scattered refrigerating machine oil is received by the groove 37 in the oil receiver provided on the auxiliary crankshaft 16B, and further guided to the auxiliary crankshaft lubrication hole 31 to lubricate the auxiliary crankshaft 16B. On the other hand, lubricating the main crankshaft lubrication hole 32 is carried out in the same manner as in the embodiment shown in FIG.
There is no difference in lubricating the

The embodiment described above has the following effects.

(2) In a multi-cylinder rotary compressor in which the main compression element and the auxiliary compression element 9 are always connected through the convex portion 15 and concave portion 27 of the shaft joint, leakage of refrigerating machine oil from the joint surface B of the shaft joint. 'n can be eliminated and the lubrication of the main compression element can be improved.

2. In the embodiment according to FIG. 5, in addition to the above-mentioned effects, the auxiliary compression element can be more reliably lubricated.

(11) Each of the above embodiments relates to a multi-cylinder rotary compressor having two compression elements (that is, two cylinders), but the present invention is applicable to a multi-cylinder rotary compressor having three or more cylinders. The same applies to rotary compressors.

Further, each of the embodiments described above relates to a multi-cylinder rotary compressor in which the main crankshaft 4 and the auxiliary crankshafts 16A, 16B are always connected through the convex portion 15 and concave portion 27 of the shaft joint. However, the present invention can also be applied to a type in which the auxiliary crankshaft can be operated separately from the main crankshaft. When applied to this type of multiple cylinder rotary compressor, the system differs from the conventional example shown in Fig. 1.
Even if the auxiliary crankshaft is disconnected and the auxiliary compression element is stopped, the oil pump can freely rotate within the auxiliary crankshaft and lubricate the main compression element.

As described above in detail, the present invention includes one motor, at least a cylinder, a roller that eccentrically rotates within the cylinder, and a vane that divides the space within the cylinder into two while contacting the roller.

(12) A crankshaft that rotates the roller, a bearing that supports the crankshaft, the cylinder, and the roller.

A plurality of compression elements each having cylinder end plates that maintain airtightness are stacked in a layered manner and stored in a sealed container, and the lubricating oil stored at the bottom of the sealed container is pumped by an oil pump. In a multi-cylinder rotary compressor that lubricates each compression element by pumping water, a main crankshaft that rotates the roller of the main compression element closest to the motor is directly connected to the motor, and a lower end of the main crankshaft is connected directly to the motor. Since an oil pump is installed, there is no possibility of lubricating oil leaking from the gaps between the joint surfaces of the shaft joints, and multiple pumps are installed to ensure that all compression elements are sufficiently lubricated and maintained in a good state of lubrication. A cylinder rotary compressor can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional multiple cylinder rotary compressor, Fig. 2 is an enlarged sectional view showing details around the oil pump in Fig. 1, and Fig. 3 is an embodiment of the present invention. Cross-sectional view of a multi-cylinder rotary compressor according to an example, No. 4
5 is an enlarged sectional view showing details of the oil pump rotation in FIG. 3, and FIG. 5 is an enlarged sectional view showing details of the oil pump rotation of a multiple cylinder rotary compressor according to another embodiment of the present invention. It is a diagram. ■...Airtight container, 2...Rotor, 3...Stator, 4...Main crankshaft, 6...Main roller, 7...
Main cylinder, 8... Main cylinder upper end face plate, 9... Main compression element upper bearing part, 10... Main cylinder lower end face plate, 1
DESCRIPTION OF SYMBOLS 1... Main compression element lower bearing part, 16A, 16B... Auxiliary crankshaft, 18... Auxiliary roller, 19... Auxiliary cylinder, 20... Auxiliary cylinder upper end face plate, 21...
- Auxiliary compression element upper bearing part, 22... Auxiliary cylinder lower end face plate, 23... Auxiliary compression element lower bearing part, 31... Auxiliary crankshaft lubrication hole, 33. 35... Oil pump, 36
...Oil filled, 37...The oil receiver is a groove. Agent Patent attorney Kosaku Fukuda (and 1 other person) No. 1 Socha 3 Part 507- No. 4

Claims (1)

[Claims] 1. One motor, at least a cylinder, a roller that rotates eccentrically within the cylinder, a vane that contacts the roller and divides the space within the cylinder into two, a crankshaft that rotates the roller, and a crankshaft that rotates the cylinder. A bearing portion for supporting the cylinder. A plurality of compression elements each having a cylinder end plate that is kept airtight by rollers and vanes are stacked in a layered manner and stored in a sealed container, and the lubricating oil stored at the bottom of the sealed container is pumped by an oil pump. In a multi-cylinder rotary compressor that pumps water to lubricate each of the compression elements,
A multi-cylinder rotary compressor, characterized in that a main crankshaft for rotating a roller of a main compression element closest to the motor is directly connected to the motor, and an oil pump is provided at the lower end of the main crankshaft. 2. Install an oil tank in the middle of the oil pump, and install the auxiliary crankshaft.
2. The multi-cylinder rotary compressor according to claim 1, wherein the oil receiver is provided with a groove and an auxiliary crankshaft lubrication hole connected to the oil receiver at a position facing the oil receiver.