JPH09151890A - Hermetic type rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type rotary compressor to improve sealing ability, to reduce the generation of noise, and improve reliability. SOLUTION: Compressed gas is discharged in a muffler space 122 formed in each of the main bearing 105 side and the auxiliary bearing 106 side and a discharge gas passage 135 to intercommunicate the two muffler spaces through the main bearing 105, a cylinder, and the auxiliary bearing 106 is provided. The inside diameter d1 of the cylinder of the discharge gas passage 135 is set to a value higher than the inside diameters d2 of the main bearing 105 and the auxiliary bearing 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor used in a refrigerant circuit of a refrigerator or an air conditioner, and more particularly to a hermetic rotary compressor whose noise is reduced by improving a muffler structure.

[0002]

2. Description of the Related Art For example, a heat pump type air conditioner is
It is composed of a compressor, an indoor heat exchanger, a pressure reducing device, an outdoor heat exchanger, a four-way valve, and an accumulator, and the refrigerant is circulated in this order during heating operation, and in the cooling operation in the opposite direction to the heating operation. Is circulated. A hermetic rotary compressor is used as a compressor for compressing the refrigerant in this refrigerant circuit.

Conventionally, in this type of compressor, a rotary compression element and an electric element for driving the rotary compression element are housed in a sealed case. The rotary compression element includes a cylinder, rollers, blades,
A main bearing, a sub bearing, etc. are provided, and a roller that eccentrically inside the cylinder is attached to the eccentric portion of the rotating shaft.

In the hermetic rotary compressor, the gas discharged in the compression chamber of the cylinder is guided from the discharge port to the muffler through the discharge valve and is silenced by the muffler, after which the electric element is housed. It is guided to the motor chamber and discharged from the discharge pipe provided in the closed container to the refrigerant circuit.

Conventionally, as a muffler used to reduce the noise generated by the pressure pulsation of the discharge gas, a cup-shaped cup muffler made by press-forming a sheet metal is attached to the flange portions of the main bearing and the sub-bearing to provide a muffler chamber. The ones are common.

[0006]

However, in recent air conditioners, quieter operation is required. It has been pointed out that the simple muffler structure in which the conventional cup muffler is attached is advantageous in terms of cost, but its pulsation damping effect is insufficient in order to further improve the operation quietness.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to effectively attenuate the pressure pulsation of the discharge gas, and to provide a hermetic rotary compressor which reduces noise. is there.

[0008]

According to a first aspect of the present invention, there is provided an electric element in a closed container, and a rotary compression element that is driven by the electric element and compresses gas by a roller that eccentrically rotates in a cylinder. In a hermetic rotary compressor having a rotary compression element, in which a muffler that stores and muffles compressed gas is guided, the compressed gas is used as a main bearing,
A discharge gas passage that discharges the muffler space formed on the sub bearing side and communicates with the muffler space through the main bearing, the cylinder, and the sub bearing is provided, and the inner diameter of the discharge gas passage in the cylinder is the main bearing. , Larger than the inner diameter of the auxiliary bearing.

According to the invention described in claim 1, the pressure pulsation of the discharge gas is absorbed in each of the muffler spaces on the main bearing side and the sub bearing side, and the gas discharged to the muffler space on the sub bearing side is absorbed. In the process of being guided to the muffler chamber on the side of the main bearing through the discharge gas passage, the pressure pulsation is further attenuated in the passage forming the volume trap having a larger inner diameter in the middle cylinder, so that the sound deadening effect is enhanced.

According to a second aspect of the present invention, an electric element and a rotary compression element for compressing gas by a roller driven by the electric element and eccentrically rotating in the cylinder are housed in a closed container. In a hermetic rotary compressor provided with a muffler portion in which the compressed gas is guided and silenced in the rotary compression element, the compressed gas is formed by muffler cups attached to the flange portions of the main bearing and the auxiliary bearing, respectively. A discharge gas passage that discharges the muffler space through the main bearing, the cylinder, and the auxiliary bearing and connects the muffler space to each other is provided, and the inner diameter of the discharge gas passage in the cylinder is the inner diameter of the main bearing and the auxiliary bearing. It is set larger than.

The invention according to claim 2 specifically defines the invention according to claim 1, and the invention according to claim 1 is as follows.
It is possible to surely obtain the same effect as that of the invention described in (1).

According to a third aspect of the present invention, in the invention according to the first or second aspect, the inner diameters of the passages formed in the main bearing and the auxiliary bearing are different from the inner diameters of the passages formed in the cylinder in the discharge gas passage. The ratio is in the range of 1.1 to 20.

In the third aspect of the invention, the ratio of the inner diameters of the discharge gas passages is defined within this range.
This is because if it is less than 1.1, the pressure pulsation of the discharge gas cannot be sufficiently attenuated, and if it is more than 20, the pressure loss of the gas flowing through the discharge gas passage becomes too large.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a circuit of a refrigeration cycle of an air conditioner including a compressor of the present invention. This refrigerant circuit includes a compressor 1, an indoor heat exchanger 2, a pressure reducing device 3,
The outdoor heat exchanger 4, the four-way valve 5, and the accumulator 6 are arranged in this order. The indoor heat exchanger 2 and the outdoor heat exchanger 4 are each provided with a fan, and indoor air or outdoor air is heat-exchanged.

The four-way valve 5 is switched to the direction in which the refrigerant flows as indicated by the solid line during the cooling operation, and is switched to the direction in which the refrigerant flows as indicated by the broken line during the heating operation.

In the heat pump type air conditioner, when the indoor heat exchanger 2 acts as an evaporator during the cooling operation, the outdoor heat exchanger 4 acts as a condenser. During the heating operation, when the indoor heat exchanger 2 acts as a condenser, the outdoor heat exchanger 4 acts as an evaporator.

In the refrigerant circuit of FIG. 1, during cooling operation, the four-way valve 5 is switched in the direction shown by the solid line, so that the compressor 1, the outdoor heat exchanger 4, the pressure reducing device 3, the indoor heat exchanger 2,
The refrigerant is circulated in the order of the four-way valve 5 and the accumulator 6. That is, during the cooling operation, the outdoor heat exchanger 4 acts as a condenser, the indoor heat exchanger 2 acts as an evaporator, the refrigerant is vaporized, and heat is pumped up from the indoor air.

On the contrary, during the heating operation, the four-way valve 5 is switched in the direction shown by the broken line, and the compressor 1, the indoor heat exchanger 2, the pressure reducing device 3, the outdoor heat exchanger 4, the four-way valve 5 and the accumulator 6 are switched. Refrigerant is circulated in order. The refrigerant introduced into the indoor heat exchanger 2 from the compressor 1 during the heating operation is heat-exchanged with the indoor air and acts as a condenser.
The refrigerant that has passed through is introduced into the outdoor heat exchanger 4 via the pressure reducing device, and the outdoor heat exchanger 4 acts as an evaporator to vaporize the refrigerant and pump up heat from the outside air.

FIG. 2 shows the compressor 1 and the accumulator 6 of the refrigerant circuit of FIG. 1, and FIG. 3 shows an example of the internal structure of the compressor 1.

2 and 3, the hermetic container 21 of the hermetic rotary compressor 1 has an end cap 31 and a case 33. Inside the airtight container 21, an electric element D including a stator 102 and a rotor 103 shown in FIG. 3, and a rotary compression element A including a cylinder 107, a roller 109 and the like are housed.

The rotor 103 of the electric element D has a rotary shaft 10
4, which is connected to the upper part of the rotary shaft 104,
No. 05 and the sub bearing 106 are rotatably supported. The main bearing 105 and the sub bearing 106 are arranged in the cylinder 107 so as to seal the upper and lower openings of the cylinder 107.
It is fixed to. An eccentric portion 104a is formed on the rotating shaft 104 between the main bearing 105 and the sub bearing 106,
A roller 109 that is eccentrically rotated in the compression chamber of the cylinder 107 is fitted in the eccentric portion 104a.

The cylinder 107 incorporates a blade (not shown) which is kept in contact with the roller 109 at all times by a spring (not shown). The vertical dimension of the roller 109 is smaller than the vertical dimension of the cylinder 107, so that a gap is formed between the upper end surface of the roller 109 and the main bearing 105. A thin plate 118 is inserted in this gap. The refrigerant gas sucked into the cylinder 107 from the accumulator 6 via the suction pipe 113 is such that the volume of the compression chamber 117 surrounded by the blade and the roller 109, the thin plate 118, the auxiliary bearing 106 and the cylinder 107 is periodically generated by the rotation of the roller 109. When the muffler is compressed, it is compressed and discharged to the muffler shown in FIG. The refrigerant gas silenced in the muffler section is discharged from the discharge pipe 112 to the refrigeration cycle through the gap between the stator 102 and the rotor 103.

In FIG. 4, the main bearing 105 has an integral structure with the main frame 120 as a flange portion for sandwiching and fixing the cylinder 107 with the sub bearing 106. In this embodiment, the mainframe 120
A cup muffler 121 drawn into a cup shape is fixed to the inside of the cup muffler 121 with a plurality of bolts that are tightened at regular intervals in the circumferential direction, and a muffler chamber 122 is formed inside the cup muffler 121. ing. This muffler room 1
22 is a gas discharge port 1 that penetrates the main frame 120.
It is adapted to communicate with the compression chamber 124 in the cylinder 107 via 23. In addition, in the cup muffler 121,
A plurality of small holes (not shown) for leading out gas from the muffler chamber 122 are perforated.

On the other hand, the auxiliary bearing 106 also has an integral structure with the bearing plate 130 as a flange portion. The cup muffler 131 is fixed to the bearing plate 130, and the muffler chamber 132 is provided inside the cup muffler 131.
Are formed. The refrigerant gas compressed through the gas discharge port 133 penetrating the bearing plate 130 is introduced into the muffler chamber 132 from the compression chamber 124.

A discharge gas passage 135 is formed concentrically through the main frame 120, the bearing plate 130 and the cylinder 107. The discharge gas passage 135 has an inner diameter d1 in the cylinder 107 and an inner diameter d2 in the main frame 120 and the bearing plate 130, and is a passage having a changed inner diameter.

In this embodiment, d1: d2 = 3: 1 is set, and the cylinder 107 is a passage having a large inner diameter. Regarding the ratio of the inner diameters d1 and d2, d1 / d2 may be in the range of 1.1 to 20 in order to reduce pressure pulsation as described later. The reason for setting such a range is that if it is less than 1.1, the pressure pulsation of the discharge gas cannot be sufficiently attenuated, and if it is more than 20, the pressure loss of the gas flowing through the discharge gas passage becomes too large. is there.

In the muffler section, the gas compressed in the compression chamber 124 is supplied to the gas discharge port 1 of the main frame 120.
23 is discharged into the muffler chamber 122, and is discharged from the gas discharge port 133 of the bearing plate 130 into the muffler chamber 132. At this time, the pressure pulsation of the compressed gas is narrow from the gas discharge ports 123 and 133 to the muffler chamber 12.
It is absorbed when it is led to 2,132.

Further, the gas discharged into the muffler chamber 132 is guided to the muffler chamber 122 through the discharge gas passage 135, and in the process, the gas forming a volume trap having a larger inner diameter d1 in the middle cylinder 107 is formed. Since it passes, the pressure pulsation is further attenuated, and the sound deadening effect is enhanced.

The present invention has been described above with reference to the best mode. However, the present invention does not use a cup muffler, for example, but is a closed structure in which a muffler chamber is formed inside the main frame and the bearing frame. It can also be applied to a rotary compressor. Further, as the hermetic rotary compressor, a two-cylinder compressor can be applied.

[0030]

As is apparent from the above description, according to the invention described in claim 1, the compressed gas is discharged into the muffler spaces formed on the main bearing side and the sub bearing side, respectively, and
A discharge gas passage that communicates the muffler spaces through the main bearing, the cylinder, and the sub bearing is provided, and the inner diameter of the discharge gas passage in the cylinder is set to be larger than the inner diameter of the main bearing and the sub bearing. In addition to the sound deadening effect in both muffler spaces, an appropriate volume trap is formed in the middle of the discharge gas passage to effectively attenuate the pressure pulsation of the discharge gas passing therethrough, so that noise can be reduced. .

According to the invention described in claim 2, according to claim 1
Since the invention described in (1) is specifically defined, it is possible to reliably obtain the same effect as the invention described in (1).

According to the third aspect of the present invention, the ratio of the inner diameter of the cylinder of the discharge gas passage to the inner diameter of the main bearing and the auxiliary bearing is set in the range of 1.1 to 20. The pulsation can be effectively damped to surely enhance the noise reduction effect.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigerant circuit of an air conditioner including a compressor according to an embodiment of the present invention.

FIG. 2 is a front view showing an example of a compressor of the refrigerant circuit shown in FIG.

3 is a cross-sectional view showing the inside of a rotary compression element of the compressor shown in FIG.

FIG. 4 is a cross-sectional view showing a configuration of a muffler portion.

[Explanation of symbols]

 1 Compressor 6 Accumulator 33 Airtight container 105 Main bearing 106 Secondary bearing 107 Cylinder 120 Main frame 121 Cup muffler 122 Muffler chamber 130 Bearing plate 131 Cup muffler 132 Muffler chamber 135 Discharge gas passage d1 Inner diameter of discharge gas passage in cylinder d2 Discharge gas passage Inner diameter of main bearing and sub bearing

Claims (3)

[Claims] 1. A hermetically sealed container accommodates an electric element and a rotary compression element that is driven by the electric element and that compresses gas by a roller that eccentrically rotates in a cylinder. The compressed gas is guided and silenced. In the hermetic rotary compressor having the muffler part in the rotary compression element, the compressed gas is discharged into the muffler spaces formed on the main bearing side and the sub bearing side, respectively, and penetrates the main bearing, the cylinder, and the sub bearing. Then, a discharge gas passage that connects the two muffler spaces is provided, and the inner diameter of the discharge gas passage in the cylinder is set to be larger than the inner diameters of the main bearing and the auxiliary bearing. 2. An electric element and a rotary compression element that is driven by the electric element and compresses gas by a roller that eccentrically rotates in a cylinder are housed in a hermetic container, and the compressed gas is guided and silenced. In the hermetic rotary compressor provided with the muffler part in the rotary compression element, the compressed gas is discharged into the muffler space formed by the muffler cups respectively attached to the flange parts of the main bearing and the auxiliary bearing, and the main gas is discharged. A discharge gas passage that communicates the muffler spaces through the bearing, the cylinder, and the sub bearing is provided, and the inner diameter of the discharge gas passage in the cylinder is set to be larger than the inner diameters of the main bearing and the sub bearing. Hermetic rotary compressor. 3. The ratio of the inner diameter of the passage formed in the main bearing and the auxiliary bearing to the inner diameter of the passage formed in the cylinder in the discharge gas passage is in the range of 1.1 to 20. The hermetic rotary compressor according to 1 or 2.