JPH0560085A - Rotary compressor - Google Patents

Abstract

(57) [Summary] [Purpose] When the filter in the accumulator is clogged due to the inflow of a large amount of liquid refrigerant, the liquid refrigerant accumulated on the filter of the accumulator should be directly injected into the cylinder of the compressor. In this way, it is possible to prevent out-of-gas operation in the cylinder chamber, cool the cylinder at the same time, and prevent seizure of sliding parts. A compression element (4) is provided with an injection port (48) that opens into a cylinder chamber (44) before the end of the suction process and during the compression process. Inlet pipe 5 in accumulator K
The check valve 71 that allows only the flow from the primary side space 54 to the injection port 48 between the primary side space 54 and the injection port 48 of the filter 53 where 1 is opened.
Connect the bypass passage 7 with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor having a motor and a compression element in a hermetic casing and an accumulator on the side of the hermetic casing.

[0002]

2. Description of the Related Art A conventional compressor of this type is, for example, an actual Kaihei 2
No. 13182, and as shown in FIG. 4, an accumulator B is disposed on the side of a compressor body A including a motor M and a compression element CP in a closed casing C. An outlet pipe E connected to the compression element CP of the compressor body A,
The accumulator B has an inlet pipe D connected to the upper side of a cylindrical accumulator body B1 and an outlet pipe E connected to the lower side thereof, and the opening D1 and the outlet pipe E of the inlet pipe D of the accumulator body B1 are connected. Between the opening E1 of
A filter F bulging upward in a hemispherical shape is attached in a transverse shape so that foreign matters such as dust flowing in together with the gas refrigerant flowing in from the inlet pipe D are removed from the filter F.
And the gas refrigerant alone is supplied from the outlet pipe E to the compressor side, and when the liquid refrigerant flows into the accumulator body B1 together with the gas refrigerant, the liquid refrigerant contacts the filter F. By doing so, it is gasified to prevent the liquid refrigerant from being sucked into the compressor.

[0003]

However, in the accumulator described above, after performing reverse cycle defrost operation during heating operation, when returning to heating operation, or during excessive operation such as when the compressor starts sleeping, A large amount of liquid refrigerant may suddenly return from the evaporator into the accumulator body B1, and the liquid refrigerant may cause the filter F to be clogged. Therefore, the actual suction pressure of the compressor sharply decreases, and a large pressure difference occurs between the primary side space and the secondary side space before and after the filter F in the refrigerant flowing direction.
The secondary space is in a state close to vacuum, and the compressor is in vacuum operation. Therefore, the gas refrigerant is not sufficiently supplied to the compressor, the gas is out of operation, the refrigerating capacity is reduced, the effect of cooling the cylinder in the compressor with the gas refrigerant is reduced, and the internal temperature of the cylinder is reduced. Soaring up,
There is a problem that seizure occurs in the sliding portion in the compression element.

The present invention has been made in view of the above problems. An object of the present invention is to prevent a filter in an accumulator from being clogged by a large amount of liquid refrigerant flowing therein, so that a sufficient amount can be introduced into a compression element of a compressor. When the gas refrigerant is no longer supplied, by directly injecting the liquid refrigerant accumulated on the filter of the accumulator into the cylinder of the compressor, preventing out-of-gas operation, cooling the cylinder at the same time, Another object of the present invention is to provide a compressor capable of preventing the sliding portion from being seized.

[0005]

In order to achieve the above-mentioned object, the present invention has a compressor main body A in which a rotary type compression element 4 is installed in a hermetically sealed casing 1, an inlet pipe 51 and an outlet pipe 52. Between the inlet pipe 51 and the outlet pipe 52,
Consisting of an accumulator K with a filter 53 attached,
In the rotary compressor in which the outlet pipe 52 is connected to the suction port 46 of the compression element 4, the compression element 4 is provided with an injection port 48 that opens into the cylinder chamber 44 during the compression process, and the accumulator is provided. By-pass having a check valve 71 between the primary side space 54 of the filter 53 and the injection port 48 where the inlet pipe 51 in K is open, and allowing only the flow from the primary side space 54 to the injection port 48. The passage 7 was connected.

It is preferable that the liquid injection passage 6 is connected to the injection port 48 and the bypass passage 7 is connected to the liquid injection passage 6.

[0007]

Function: The filter 5 in the accumulator body 5
When 3 is clogged with a large amount of liquid refrigerant,
The liquid refrigerant accumulated in the primary side space 54 of the accumulator body 5 can be passed through the bypass passage 7 and injected into the cylinder chamber 44 from the injection port 48 to be gasified. And the compression element 4 can be cooled at the same time. As a result, it is possible to prevent deterioration of the refrigerating capacity and prevent seizure of each sliding portion of the compression element 4. ..

In addition, by connecting the liquid injection passage 6 to the injection port 48 and connecting the bypass passage 7 to the liquid injection passage 6, the liquid injection passage is provided in a structure in which the liquid injection passage is provided. Since the bypass passage 7 can be communicated with the injection port 48 by utilizing it, the structure can be simplified accordingly.

[0009]

EXAMPLE FIG. 1 shows a refrigerating apparatus to which a hermetic rotary compressor is applied.
The condenser G, the expansion mechanism H, the evaporator I and the accumulator K are connected by a refrigerant pipe J as shown in the figure to form a refrigeration cycle, and the compressor body A of the rotary compressor is A motor 2 including a rotor 21 and a stator 22 is installed inside the closed casing 1, and a compression element 4 that is driven by a drive shaft 3 is installed below the motor 2. The accumulator K is arranged on the side of the closed casing 1.

The compression element 4 includes a front head 41,
A rear head 42 and a cylinder 43 sandwiched between the two heads 41, 42 are provided. Inside the cylinder chamber 44, an eccentric portion 31 of the drive shaft 3 and a roller 45 inserted into the eccentric portion 31 are installed. There is.

Further, in the cylinder chamber 44, as shown in FIGS. 2 and 3, an intake port 46 for supplying a low pressure gas refrigerant introduced from the accumulator K to the cylinder chamber 44, and a high pressure gas after compression. A discharge port 47 for discharging the refrigerant is opened, and by the eccentric rotation of the roller 45, the low-pressure gas refrigerant sucked from the suction port 46 is compressed in the cylinder chamber 44, and the compressed high-pressure gas refrigerant is discharged. Discharge from the discharge port 47 into the casing 1. Reference numeral 49 in the drawing denotes a blade that slides as the roller 45 eccentrically rotates.

The accumulator K arranged laterally of the casing 1 is provided with an inlet pipe 51 above the accumulator body 5 and an outlet pipe 52 below the accumulator body 5. The inlet pipe 51 and the outlet pipe 52 are connected to each other. An anti-spherical filter 53 that traverses the inside of the accumulator body 5 is attached between
The outlet pipe 52 is connected to the suction port 46 of the compression element 4.

Further, a liquid injection passage 6 having a two-way valve 61 and a capillary tube 62 interposed therein is connected to the refrigerant pipe J connecting the condenser G and the expansion mechanism H, and the liquid injection passage 6 is also connected. When the temperature of the cylinder chamber 44 rises abnormally, the two-way valve 61 is opened to communicate with the injection port 48 opening in the cylinder chamber 44 of the compression element 4 to open the condenser G.
The liquid refrigerant condensed in (1) is injected into the cylinder chamber 44 through the liquid injection passage 6 to be cooled.

Therefore, in the rotary compressor described above, the injection port 48 formed in the compression element 4 is provided in the cylinder chamber 44 immediately before the end of the low pressure gas refrigerant suction process to the middle of the compression process. The liquid injection passage 6 is connected to the injection port 48 while being formed at an opening position. In the embodiment shown in FIG. 1, the filter 5 in which the inlet pipe 51 of the accumulator K is opened.
3 between the primary side space 54 and the liquid injection passage 6 connected to the injection port 48, a bypass passage having a check valve 71 that allows only the flow from the primary side space 54 to the injection port 48. 7 was connected.

Specifically, with respect to the mounting position of the filter 53 in the accumulator body 5 of the accumulator K, the liquid refrigerant outlet port is located near the filter 53 installation position in the primary side space 54 in which the inlet pipe 51 opens. 56 is formed, and one end side of the bypass passage 7 is connected to the liquid refrigerant outlet 56. The other end of the bypass passage 7 is connected to the liquid injection passage 6 communicating with the injection port 48,
The connection to the liquid injection passage 6 is made downstream of the capillary tube 62, and between the connection position with the liquid injection passage 6 in the bypass passage 7 and the liquid refrigerant outlet 56. The check valve 71 is provided in the.

The opening position of the injection port 48 to the cylinder chamber 44 is, as shown in FIG. 2, when the low-pressure gas refrigerant is being sucked from the suction port 46, the injection port 48 is set to the roller 45. The liquid refrigerant is closed by the cylinder chamber 4
4, the injection port 48 is opened in the cylinder chamber 44 immediately before the suction process is finished as shown in FIG. 3, and the injection port 48 is opened to the middle of the compression process. Cylinder chamber 44
It is possible to inject the liquid refrigerant into.

By doing so, the primary side space 5 of the accumulator body 5 is activated when the compressor starts to lie down.
When a large amount of liquid refrigerant suddenly flows into the nozzle 4 from the inlet pipe 51 and the entire surface of the primary side space 54 of the filter 53 is covered with the liquid refrigerant to cause clogging, the liquid of the accumulator body 5 is discharged. From the refrigerant outlet 56, the liquid refrigerant flows into the bypass passage 7 and reaches the injection port 48 via the liquid injection passage 6, and in the compression element 4, from immediately before the end of the suction process to the middle of the compression process. In the meantime, the injection is carried out from the injection port 48 into the cylinder chamber 44. At this time, during the suction process into the cylinder chamber 44, the inside of the accumulator body 5 is
Since the secondary side space of the filter is in a substantially vacuum state due to the clogging of No. 3, the suction pressure to the cylinder chamber 44 drops sharply and the actual suction pressure becomes a low pressure close to a vacuum state. The liquid refrigerant accumulated in the primary space 54 of the filter 53 due to this pressure difference is injected from the injection port 48 through the bypass passage 7, and the injected liquid refrigerant is stored in the cylinder chamber 44. It is compressed and compressed.

When the pressure in the cylinder chamber 44 rises, the pressure in the bypass passage 7 becomes lower than the pressure in the cylinder chamber 44. Therefore, even if the injection port 48 is open, the injection port 48 is opened. The liquid refrigerant does not enter from 48. In this case, since the check valve 71 is provided in the bypass passage 7, there is no reverse flow from the high pressure side to the primary side space 54 of the filter 53.

As described above, even if the filter 53 in the accumulator body 5 is clogged with a large amount of liquid refrigerant, the liquid refrigerant accumulated in the primary side space 54 of the accumulator body 5 flows through the bypass passage 7. Since it can be passed and injected into the cylinder chamber 44 from the injection port 48 through the liquid injection passage 6 to be gasified, out-of-gas operation can be prevented, and at the same time, the compression element 4 can be cooled. As a result, it is possible to prevent the sliding capacity of the compression element 4 from being seized while reducing the deterioration of the refrigerating capacity.

Although the bypass passage 7 is connected to the liquid injection passage 6 in the above-described embodiment, the bypass passage 7 can be applied to a model without the liquid injection passage 6. In such a case, The injection port 48 may be specially provided in the compression element 4, and the bypass passage 7 may be directly connected to the port 48.

[0021]

As described above, in the rotary compressor of the present invention, the compression port 4 is provided with the injection port 48 that opens into the cylinder chamber 44 during the compression process, and the inlet pipe 51 of the accumulator K is provided. Between the primary side space 54 of the filter 53 and the injection port 48 where the primary side space 54 is open.
Since the bypass passage 7 having the check valve 71 which allows only the flow from the accumulator to the injection port 48 is connected, when the filter 53 in the accumulator body 5 is clogged with a large amount of liquid refrigerant, the accumulator body is 5, the liquid refrigerant accumulated in the primary side space 54 can be passed through the bypass passage 7 and injected into the cylinder chamber 44 from the injection port 48 to be gasified, so that a gas shortage operation can be prevented. At the same time, the compression element 4 can be cooled, and as a result, it is possible to prevent the sliding capacity of the compression element 4 from being burned while reducing the reduction in the refrigerating capacity.

Further, by connecting the liquid injection passage 6 to the injection port 48 and connecting the bypass passage 7 to the liquid injection passage 6, the liquid injection passage can be used in a structure in which the liquid injection passage is provided. However, since the bypass passage 7 can be communicated with the injection port 48, the structure can be simplified accordingly.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a refrigeration cycle of a refrigeration system using a rotary compressor of the present invention.

FIG. 2 is a sectional view of a cylinder showing a closed state of an injection port in the rotary compressor of the present invention.

FIG. 3 is a sectional view of a cylinder showing an opened state of an injection port in the rotary compressor of the present invention.

FIG. 4 is an explanatory view showing a conventional example.

[Explanation of symbols]

 A compressor body 1 closed casing 4 compression element 44 cylinder chamber 46 suction port 48 injection port K accumulator 51 inlet pipe 52 outlet pipe 53 filter 54 primary side space 6 liquid injection passage 7 bypass passage 71 check valve

Claims (2)

[Claims] 1. A compressor body A in which a rotary type compression element 4 is installed in a closed casing 1, an inlet pipe 51 and an outlet pipe 52, and between the inlet pipe 51 and the outlet pipe 52,
Consisting of an accumulator K with a filter 53 attached,
A rotary compressor in which the outlet pipe 52 is connected to a suction port 46 of the compression element 4, wherein the compression element 4 is provided with an injection port 48 that opens into the cylinder chamber 44 during the compression process, A check valve 71 that allows only a flow from the primary space 54 to the injection port 48 is provided between the injection port 48 and the primary space 54 of the filter 53 in which the inlet pipe 51 of the accumulator K opens. A rotary compressor having a bypass passage 7 connected thereto. 2. The rotary compressor according to claim 1, wherein the liquid injection passage 6 is connected to the injection port 48, and the bypass passage 7 is connected to the liquid injection passage 6.