JPH08144968A - Scroll type compressor - Google Patents

Abstract

PURPOSE: To prevent the occurrence of gas leakage immediately after the start of operation, and the seizure or the like of a slide section by forming an intermediate pressure chamber on the back a rotary scroll, a communication port on the external surface of a bearing for keeping the low pressure side communicated to the chamber, and a communication hole in the external surface of a stationary scroll for keeping the high pressure side communicated to the chamber. CONSTITUTION: Regrding the scroll type compressor where a sealed vessel 1 houses a compression section 2 made a spiral stationary scroll 4 and a rotary scroll 5 cooperating therewith, and the rotary scroll 5 is rotated on the operation of an electric motor, an intermediate pressure chamber 6 is formed on the back of the scroll 5. In addition, the chamber 6 is kept communicated to the low pressure side via a communication port 7b formed on the outer surface of bearing 7. Also, communication port 4b of smaller diameter than the port 7b is formed on the external surface of the scroll 4 for communicating the high pressure side to the chamber 6. According to this construction, gas leakage or the like just after the start of operation, resulting from the wavy rotation of the scroll 5 due to unbalanced pressure, can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor, and more particularly to a structure for preventing unstable motion of an orbiting scroll.

[0002]

2. Description of the Related Art A conventional scroll compressor will be described with reference to FIG. 5 which is a vertical sectional view thereof and FIG. 6 which is an enlarged sectional view of a main portion thereof. The scroll type compressor has a hermetic container 1 in which a compression unit 2 and an electric motor 3 are built. The compression unit 2 is mainly composed of a fixed scroll 4, an orbiting scroll 5, an Oldham ring 12, a crankshaft 11, an eccentric bearing 13, a bearing 7, and a shaft 10. In this structure, the fixed end plate 4a has a fixed scroll wrap 4 having a spiral shape.
b is integrally formed and a fixed scroll fixed to the bearing,
A plurality of compression chambers 9 are formed by meshing a fixed scroll wrap 5b having a spiral shape with a revolving end plate 5a and a revolving scroll integrally formed with a revolving drive shaft 5c on the back surface with the scroll wrap inside. When the electric motor rotates, the orbiting scroll causes the orbiting scroll to orbit by the Oldham ring through the eccentric bearing fitted to the crankshaft formed in the upper part of the shaft attached to the bearing, while preventing rotation by the Oldham ring. The low-pressure refrigerant sucked from the suction pipe 15 into the compression section by the orbiting motion of the orbiting scroll is compressed while moving sequentially from the outer peripheral portion of the compression chamber to the central portion, and becomes high-pressure refrigerant, and from the discharge port 14 to the discharge chamber 16, the communication passage 18, And, it is sent out of the machine from the discharge pipe 19 through the space 17 between the compression unit and the electric motor.
Further, due to the refrigerant pressure that has risen in the center of the compression chamber, a separating force that pushes down the orbiting scroll 5 acts, and the fixed end plate 4a
In order to prevent a gap from being formed between the orbiting scroll wrap 5b and the orbiting end plate 5a and the fixed scroll wrap 4b, gas leakage may occur and compression efficiency may be deteriorated. The high-pressure refrigerant is introduced to provide the high-pressure portion 20, and the pushing force of the high-pressure refrigerant opposes the separating force to maintain the airtightness of the compression chamber. However, at the start of the operation when the refrigerant pressures on the suction side and the discharge side are almost equal, the pressure in the compression chamber rises first, and then the pressure in the sealed container rises from the discharge chamber, so the pressure balance inside the fuselage is not balanced. . At this time, as shown in FIG. 6, the orbiting force transmitted from the crankshaft acting on the orbiting drive shaft is divided into a force rotating in a direction orthogonal to the force pressing the orbiting scroll lap in the orbiting radial direction, and this pressing force is applied. The reaction point of the force is the orbiting scroll wrap that constitutes the compression chamber, and the action point (right arrow) and the reaction point (left arrow) are separated from each other in the axial direction of the orbiting drive shaft, so a twisting moment acts on the orbiting end plate and tilts. It will be. For this reason, there is a problem that waviness rotation occurs in the swivel end plate, gas leakage occurs in the compression chamber, and compression efficiency decreases, and at the same time, abnormal sliding occurs in each sliding part, causing seizure and abnormal wear. It was

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. A scroll which improves the stable operation performance and reliability by a mechanism for stabilizing the orbiting motion of the orbiting scroll. To provide a mold compressor.

[0004]

In order to achieve the above object, a compression part and an electric motor are arranged vertically in a hermetically sealed container, and the compression part meshes with a spiral fixed scroll and the fixed scroll. An orbiting scroll that collectively forms a plurality of compression chambers, and a shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the upper end to orbitally drive the orbiting scroll,
In a scroll compressor including a bearing that supports the crankshaft, an intermediate pressure chamber is formed on the back surface of the orbiting scroll, and a low pressure side and the intermediate pressure chamber are communicated with an outer peripheral portion of the bearing. A communication hole A is formed in the outer peripheral portion of the fixed scroll, and has a cross section smaller than the communication hole A, and a communication hole B for communicating the high pressure side and the intermediate pressure chamber is formed in the contact surface of the bearing and the crankshaft. A groove is formed and a seal member is provided in the groove. In addition, a pair of the communication holes A are arranged symmetrically with respect to the center of the bearing. A pair of the communication holes B are arranged symmetrically with respect to the center of the bearing. Further, a filter is installed on the low pressure side of the communication hole A. A filter is installed on the intermediate pressure chamber side of the communication hole B. Further, the seal member is arranged on the outer peripheral surface of the crankshaft. Alternatively, the seal member is disposed on the lower thrust surface of the crankshaft. The seal member is substantially annular and has a cross section of a substantially quadrangular shape. Alternatively, it is characterized in that the seal member has a substantially annular shape and a cross section thereof is formed into a substantially trapezoidal shape.

[0005]

According to the above construction, the compression part and the electric motor are arranged vertically in the sealed container, and the compression part is engaged with the spiral fixed scroll and the fixed scroll to form a plurality of compression chambers. A scroll-type compressor formed of a orbiting scroll to be formed, a shaft for orbiting and driving a orbiting drive shaft of the orbiting scroll to form a crankshaft at the upper end, and a bearing for pivotally supporting the crankshaft, An intermediate pressure chamber is formed on the back surface of the orbiting scroll, and a communication hole A for communicating the low pressure side and the intermediate pressure chamber is formed in the outer peripheral portion of the bearing, and a cross section smaller than the communication hole A is formed in the outer peripheral portion of the fixed scroll. Communication holes B for communicating the high pressure side and the intermediate pressure chamber are formed respectively, a groove is formed in a contact surface between the bearing and the crankshaft, and a seal member is provided in the groove. Communicating A pair of holes A are symmetrically arranged with respect to the center of the bearing, a pair of communication holes B are symmetrically arranged with respect to the center of the bearing, and a filter is installed on the low pressure side of the communication hole A. A filter is installed on the intermediate pressure chamber side of the communication hole B, the seal member is arranged on the outer peripheral surface of the crankshaft, or the seal member is attached to the lower thrust surface of the crankshaft. And the seal member is substantially annular and has a substantially square cross section, or the seal member is substantially annular and has a substantially trapezoidal cross section. Therefore, the intermediate pressure chamber exerts a push-up force that presses the orbiting scroll against the bearing to stabilize the orbiting motion of the orbiting scroll, and prevents foreign matters such as chips from clogging the communication hole A. Can Come.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same parts as those in the conventional example are denoted by the same reference numerals. FIG. 1 is a vertical cross-sectional view of a scroll type compressor showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part thereof. A compression unit 2 and an electric motor 3 are arranged vertically inside a sealed container 1, and the compression unit is provided with a scroll-shaped fixed scroll 4 and an orbiting scroll 5 that meshes with the fixed scroll to form a plurality of compression chambers 9. A shaft 10 for orbiting by forming a crankshaft 11 on the upper end of an orbiting drive shaft 5c of the orbiting scroll, and a bearing 7 for supporting the crankshaft.
And form a scroll compressor. In this structure, a fixed scroll wrap 4b having a spiral shape is integrally formed on the fixed end plate 4a, and a fixed scroll pressed against a bearing and a fixed scroll wrap 5 having a spiral shape on the swivel end plate 5a.
A plurality of compression chambers 9 are formed by meshing b with the orbiting scroll having the orbiting drive shaft 5c integrally formed on the back surface with the scroll wrap inside.

Now, description will be made with reference to FIG. An intermediate pressure chamber 6 is formed on the back surface of the orbiting scroll. Further, a communication hole A7b that communicates the low pressure side and the intermediate pressure chamber is formed in the outer peripheral portion of the bearing. A communication hole B4d that communicates the high pressure side with the intermediate pressure chamber is formed in the outer peripheral portion of the fixed scroll with a cross section smaller than the communication hole A. Furthermore,
A seal member 8 is attached to the contact surface between the bearing and the crankshaft. Here, as shown in FIG. 3, the seal member is annular and has a substantially trapezoidal cross section, and is provided in grooves 11a and 7d formed in the cylindrical surfaces of the bearing and the crankshaft. Further, as shown in FIG. 4, a seal member having a substantially square cross section may be provided in the groove formed in the lower thrust surface of the bearing and the crankshaft. As a result, the communication hole A and the communication hole B are configured so that the pressure in the intermediate pressure chamber presses the orbiting scroll against the fixed scroll. Further, a pair of the communication holes A are arranged symmetrically with respect to the center of the bearing. Then, a pair of the communication holes B are arranged symmetrically with respect to the center of the bearing. On the other hand, the filter 4e is installed on the low pressure side of the communication hole A. Further, the filter 7c is installed on the intermediate pressure chamber side of the communication hole B. This filter can prevent foreign matters such as chips from clogging the communication hole A.

As described above, the intermediate pressure chamber exerts a push-up force that presses the pressure contact surface 7a of the bearing against the pressure contact surface 4c of the fixed scroll, and thus acts as a force for pressing the orbiting scroll against the fixed scroll and overturns the orbiting scroll. It is possible to counter the moment to be caused and prevent the force from becoming excessive.

[0009]

As described above, in the present invention, the compression section and the electric motor are arranged vertically in the sealed container, and the compression section is
A spiral fixed scroll, an orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, and a shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the upper end for orbiting drive. A scroll type compressor configured to include a bearing that supports the crankshaft, an intermediate pressure chamber is formed on a back surface of the orbiting scroll, and a low pressure side and the intermediate pressure chamber are communicated with an outer peripheral portion of the bearing. And a communication hole B for communicating the high pressure side and the intermediate pressure chamber with a cross section smaller than the communication hole A on the outer peripheral portion of the fixed scroll, and a contact surface between the bearing and the crankshaft. A groove is formed in the groove, and a seal member is provided in the groove. Further, a pair of the communication holes A are arranged symmetrically with respect to the center of the bearing, and the communication hole B is formed in the bearing. A pair arranged symmetrically with respect to mind, further, the low pressure side of the communication hole A, to install a filter, and the intermediate pressure chamber side of the communication hole B, set up a filter,
Further, the seal member is arranged on the outer peripheral surface of the crankshaft, or the seal member is arranged on the lower thrust surface of the crankshaft, and the seal member is substantially annular and has a cross section. Since the seal member is formed in a substantially quadrangular shape, or the seal member is formed in a substantially annular shape and its cross section is formed in a substantially trapezoidal shape, the orbiting scroll has a stable orbiting motion, and foreign matter such as chips is prevented. It is possible to prevent the communication hole A from being clogged, and as a result, the performance and efficiency of the scroll compressor can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of an essential part showing a seal member of one embodiment of FIG.

FIG. 4 is an enlarged sectional view of an essential part showing a seal member of another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a scroll compressor showing an outline of a conventional example.

FIG. 6 is an enlarged cross-sectional view of an essential part showing a state of stress at the start of operation of the orbiting scroll of the conventional example.

[Explanation of symbols]

 1 Sealed Container 2 Compressor 3 Electric Motor 4 Fixed Scroll 4a Fixed End Plate 4b Fixed Scroll Wrap 4c Pressure Contact Surface 4d Communication Hole B 4e Filter 5 Orbiting Scroll 5a Orbiting End Plate 5b Orbiting Scroll Wrap 5c Orbiting Drive Shaft 6 Intermediate Pressure Chamber 7 Bearing 7a Pressure Contacting Surface 7b communication hole A 7c filter 7d groove 8 seal member 9 compression chamber 10 shaft 11 crankshaft 11a groove

Claims (9)

[Claims] 1. A compression unit and an electric motor are arranged vertically in a sealed container, and the compression unit includes a spiral scroll and a orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers. A scroll-type compressor comprising a shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the upper end to drive the orbit, and a bearing that axially supports the crankshaft. An intermediate pressure chamber is formed, and a communication hole A that communicates the low pressure side and the intermediate pressure chamber is formed on the outer peripheral portion of the bearing, and a high pressure side and an intermediate portion are formed on the outer peripheral portion of the fixed scroll in a cross section smaller than the communication hole A. A scroll-type compressor characterized in that a communication hole B that communicates with a pressure chamber is formed, a groove is formed in a contact surface between the bearing and the crankshaft, and a seal member is provided in the groove. 2. The scroll compressor according to claim 1, wherein a pair of the communication holes A are arranged symmetrically with respect to the center of the bearing. 3. The scroll compressor according to claim 1, wherein a pair of the communication holes B are arranged symmetrically with respect to the center of the bearing. 4. The scroll compressor according to claim 1, wherein a filter is installed on the low pressure side of the communication hole A. 5. The scroll compressor according to claim 1, wherein a filter is installed on the side of the intermediate pressure chamber of the communication hole B. 6. The scroll compressor according to claim 1, wherein the seal member is arranged on an outer peripheral surface of the crank shaft. 7. The seal member is arranged on a lower thrust surface of the crankshaft.
The scroll compressor described. 8. The scroll compressor according to claim 1, wherein the seal member is substantially annular and has a cross section formed in a substantially square shape. 9. The scroll compressor according to claim 6, wherein the seal member is substantially annular and has a substantially trapezoidal cross section.