Compressor

Abstract

A compressor (1) includes a stationary scroll (22) including a suction communication passage (40) formed such that a refrigerant flowing through a suction pipe (12) is guided to a compression chamber (28). The suction communication channel 40 is formed such that a cross-sectional shape of the suction communication channel 40 includes a stepped portion 42 formed of a plurality of steps 44.

Description

Technical Field

[0001] The present invention relates to a compressor. Background Art

[0002] There is known a compressor in which a suction communication passage is provided in a fixed scroll so that refrigerant flowing through a suction pipe is guided to a compression chamber, as disclosed in Japanese Unexamined Patent Application Publication No. 2017-53279A, hereinafter referred to as PTL 1.

[0003] In PTL 1, in order to suppress suction pressure loss in the suction communication channel, the upper portion of the suction communication channel is formed so that the cross-sectional shape of the suction communication channel in a vertical cross-sectional view taken along a plane in the direction of the flow path passing through the suction communication channel is flat and sloped.

[0004] However, it is difficult to form a flat and sloped suction communication passage in the fixed scroll using a conventional machining method such as an end mill machining method.

[0005] Therefore, there is a need to develop a compressor that can suppress the suction pressure loss in the suction communication passage and can easily form the suction communication passage in the fixed scroll.

[0006] Citation List

[0007] Patent Literature

[0008] PTL1: Japanese Unexamined Patent Application Publication No. 2017-53279A Summary of the Invention

[0009] An object of the present invention is to provide a compressor capable of suppressing a suction pressure loss in a suction communication passage and capable of easily forming the suction communication passage in a fixed scroll.

[0010] In order to achieve the above-mentioned object, an embodiment of the present invention provides a compressor, which includes: a sealed container; a motor element, which is accommodated in the sealed container; a scroll compression element, which is accommodated in the sealed container and is configured to be driven by the crankshaft of the motor element; a suction pipe, which is installed through the sealed container, and the gas refrigerant sucked from the outside flows into the scroll compression element in the suction pipe, and wherein the scroll compression element includes a fixed scroll member and a movable scroll member, the fixed scroll member includes a first scroll member body, and the movable scroll member includes a second scroll member. body, the second scroll body is configured to engage with the first scroll body to form a compression chamber between the first scroll body and the second scroll body, and the movable scroll is configured to orbit relative to the fixed scroll, wherein the fixed scroll includes a suction communication channel, the suction communication channel is formed so that the refrigerant flowing through the suction pipe is guided to the compression chamber, and wherein the suction communication channel is formed so that the cross-sectional shape of the suction communication channel includes a stepped portion, which is formed by a plurality of steps in a vertical cross-sectional view taken along a plane in the direction of the flow path passing through the suction communication channel.

[0011] First, according to an embodiment of the present invention, the cross-sectional shape of the suction communication passage includes a stepped portion formed of a plurality of steps in a vertical cross-sectional view taken along a plane in a direction passing through the flow path of the suction communication passage.

[0012] Thus, the suction pressure loss can be suppressed by suppressing a sudden change in the flow path of the refrigerant in the suction communication passage.

[0013] Secondly, since the cross-sectional shape of the suction communication passage includes a stepped portion formed of a plurality of steps, the suction communication passage including the stepped portion can be formed more easily than forming a flat, sloped suction communication passage.

[0014] Therefore, according to the embodiment of the compressor of the present invention, it is possible to suppress the suction pressure loss in the suction communication passage and to easily form the suction communication passage in the fixed scroll. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The principles of the present invention and the advantages of the present invention will become apparent in the following description taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is an explanatory diagram illustrating a schematic configuration of an embodiment of a compressor 1 according to the present invention;

[0017] Figure 2A yes Figure 1 An explanatory diagram of the fixed scroll member 22;

[0018] Figure 2Byes Figure 2A An enlarged view of the stepped portion 42 of the suction communication passage 40;

[0019] Figure 3 It is along Figure 2B a cross-sectional view taken along line III-III of ; and

[0020] Figure 4 yes Figure 1 An explanatory diagram of the movable scroll member 26. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] Figure 1 This is an explanatory diagram illustrating the schematic configuration of a scroll compressor 1 according to an embodiment. The scroll compressor 1 is a fluid machine configured to compress and discharge a fluid (i.e., a gas refrigerant) and can be a component of a refrigeration cycle device. The scroll compressor 1 according to the embodiment is a vertically mounted compressor.

[0023] like Figure 1 As shown, the scroll compressor 1 includes: a sealed container 10; a suction pipe 12, which is installed through the top surface of the sealed container 10 and is formed as a hollow cylindrical tube; a discharge pipe 14, which discharges the gas refrigerant to the outside; a scroll compression element 20, which is configured to compress the low-pressure gas refrigerant in the compression chamber 28; and a motor element 30, which is configured to drive the scroll compression element 20 accommodated in the sealed container 10.

[0024] The upper portion of the compression element 20 is supported by the intermediate housing 10a of the sealed container 10. The compression element 20 is fixed to the intermediate housing 10a of the sealed container 10 by shrink fitting or other methods. A subframe 16 is provided below the motor element 30. The subframe 16 is fixed to the inner peripheral surface of the sealed container 10.

[0025] A suction pipe 12 configured to draw low-pressure gas refrigerant from the outside into the compression element 20 is connected to a side surface of the sealed container 10. A discharge pipe 14 configured to discharge high-pressure gas refrigerant to the outside of the scroll compressor 1 is connected to a side surface of the sealed container 10.

[0026] The compression element 20 is housed in the sealed container 10 and is configured to compress the refrigerant sucked from the suction pipe 12 by the rotation of the crankshaft 36 driven by the motor element 30. Figure 1 As shown, the compression element 20 includes a non-orbiting scroll 22 and an orbiting scroll 26 .

[0027] like Figure 1and Figure 2A As shown, the fixed scroll 22 is fixed to the intermediate housing 10a at its lower end portion. The fixed scroll 22 includes a fixed scroll base plate 22a and a fixed scroll spiral wrap 22b having an involute shape to form a spiral body, and the fixed scroll spiral wrap 22b is erected on one surface of the fixed scroll base plate 22a. A discharge port 24 configured to discharge compressed refrigerant is formed in the central portion of the fixed scroll 22.

[0028] Furthermore, the fixed scroll 22 includes a suction communication passage 40 formed so that the refrigerant flowing through the suction pipe 12 is guided to the compression chamber 28 .

[0029] like Figure 1 and Figure 4 As shown, the movable scroll 26 is configured to orbit relative to the fixed scroll 22 without rotating via an Oldham mechanism (not shown). The movable scroll 26 includes an movable scroll base plate 26a and an movable scroll spiral wrap 26b having an involute shape to form a spiral body and standing upright on one surface of the movable scroll base plate 26a. An orbiting bearing 26c, formed in a bottomed cylindrical shape, is formed in a substantially central portion of the lower surface of the movable scroll base plate 26a. An eccentric shaft portion 36b, mounted on the upper end of a main shaft portion 36a described later, is inserted into the orbiting bearing 26c to cause the movable scroll 26 to orbit.

[0030] The orbiting scroll 26b is configured to engage with the fixed scroll 22b to form a compression chamber 28 therebetween. The orbiting scroll 26b is configured to orbit relative to the fixed scroll 22b.

[0031] The motor element 30 includes an electric motor stator 32 fixed to the inner peripheral surface of the sealed container 10 by shrink fitting or other methods, an electric motor rotor 34 rotatably accommodated on the inner peripheral side of the electric motor stator 32, and a crankshaft 36 (main shaft portion 36a) fixed to the electric motor rotor 34 by shrink fitting or other methods. The electric motor rotor 34 is configured to rotate when electric power is supplied to the electric motor stator 32 and transmit driving force to the movable scroll member 26 through the crankshaft 36.

[0032] The eccentric shaft portion 36b of the crankshaft 36, which is located above the electric motor rotor 34, is rotatably supported in the radial direction by a cylindrical orbiting bearing 26c mounted below the movable scroll base plate 26a. The main shaft portion 36a is fitted into the main bearing 39 and slides along the main bearing 39 via an oil film of lubricating oil. The eccentric shaft portion 36b is mounted on the upper end portion of the crankshaft 36, eccentric to the main shaft portion 36a.

[0033] Next, refer to Figures 2A to 2B and Figure 3 The suction communication passage 40 formed in the fixed scroll is described in detail.

[0034] like Figures 2A to 2B and Figure 3 As shown, the suction communication passage 40 is formed so that the refrigerant flowing through the suction pipe 12 is guided to the compression chamber 28. A suction hole 22e is formed in the upper portion of the fixed scroll 22 (see FIG. Figure 3 ).exist Figure 2A and Figure 2B , the circumference of the suction hole 22e is shown as a circle drawn with a dotted line to illustrate the positional relationship between the suction hole 22e and the suction communication path.

[0035] The suction pipe 12 is fitted into the suction hole 22e. A check valve 25 is provided in the suction hole 22e to prevent reverse flow of refrigerant. The check valve 25 includes a valve body 25a and a spring 25b, which urges the valve body 25a toward the suction pipe 12. Refrigerant flowing through the suction pipe 12 is guided to the compression chamber 28 via the suction hole and the suction communication passage 40.

[0036] like Figure 3 As shown in a longitudinal cross-sectional view taken along a plane in the direction of the flow path of the refrigerant flowing through the suction communication channel 40, the suction communication channel 40 is formed so that the cross-sectional shape of the suction communication channel 40 includes a stepped portion 42 formed by a plurality of steps 44 in a vertical cross-sectional view taken along a plane in the direction of the flow path passing through the suction communication channel 40. Figure 2A and Figure 2B In FIG, the stepped portion 42 is colored light gray.

[0037] like Figure 2B As shown, when viewed from the side where the fixed scroll 22 is engaged with the movable scroll 26, the stepped portion 42 is formed so that the cross-sectional shape of the suction connecting channel 40 becomes lower with each step 44, and so that the length of the curve at the outermost point of each step 44 relative to the center of the fixed scroll 22 is longer than the length of the curve at the innermost point of each step 44 along the outer wall 22d of the fixed scroll 22.

[0038] Thus, the innermost point of each step 44 is positioned along the involute of the outer wall 22d of the fixed scroll 22. By forming each step 44 into the same shape, when viewed from the side where the fixed scroll 22 is engaged with the movable scroll 26, the area surrounded by the outermost point and the inner point of the step 44 is formed almost into a fan shape.

[0039] Thereby, it is possible to suppress the suction pressure loss by suppressing a sudden change in the flow path of the refrigerant in the suction communication passage 40. Therefore, the loss occurring during the process of sucking the gas refrigerant through the suction communication passage 40 can be reduced.

[0040] In addition, since the cross-sectional shape of the suction communication channel 40 includes a stepped portion 42 formed by a plurality of steps 44, the suction communication channel 40 including the stepped portion 42 can be more easily formed by using conventional processing methods such as end mill machining methods compared to forming a flat, sloped suction communication channel 40.

[0041] Next, a method for manufacturing the suction communication passage 40 of the scroll compressor 1 will be described.

[0042] First, the fixed scroll 22 formed of the fixed scroll base plate 22a and the fixed scroll spiral wrap 22b is prepared, and then, in order to machine the fixed scroll 22 using an end mill machining method, the fixed scroll 22 is fixed to a predetermined jig.

[0043] Next, a plurality of steps 44 are cut from the suction communication passage 40 of the fixed scroll 22 on the side where the fixed scroll 22 engages with the movable scroll 26. During the stage of applying the end mill machining method to the fixed scroll 22, the stepped portion 42 of the suction communication passage 40 is formed by cutting the suction communication passage 40 for each step 44. Therefore, compared with forming a flat, sloped suction communication passage 40, the suction communication passage 40 including the stepped portion 42 can be formed more easily by using a conventional machining method such as the end mill machining method.

[0044] Specifically, the suction communication passage 40 is cut sequentially from the lower step to the higher step for each step 44 from the side where the fixed scroll 22 and the movable scroll 26 are joined.

[0045] Although specific embodiments of the present invention have been disclosed, described, and illustrated in the accompanying drawings, this is only for a better understanding of the principles of the present invention and is not intended to limit the scope and spirit of the present invention. Without departing from the scope of the present invention as defined by the claims, it is possible and obvious for a skilled person to adapt and modify various structures such as the design or materials of the present invention, the installation mechanism of various components and elements, or the various embodiments of the present invention.

[0046] Reference numerals:

[0047] 1: Scroll compressor

[0048] 10: Sealed container

[0049] 10a: Intermediate housing

[0050] 12: Suction pipe

[0051] 14: Discharge pipe

[0052] 16: Subframe

[0053] 20: Compression element

[0054] 22: Fixed scroll

[0055] 22a: Fixed scroll base plate

[0056] 22b: Fixed scroll spiral scroll

[0057] 22c: Inner wall

[0058] 22d: outer wall

[0059] 22e: Suction hole

[0060] 24: Discharge port

[0061] 25: Check valve

[0062] 25a: Valve body

[0063] 25b: Spring

[0064] 26: Moving scroll

[0065] 26a: movable scroll substrate

[0066] 26b: Orbiting scroll spiral scroll

[0067] 26c: Orbiting bearing

[0068] 28: Compression chamber

[0069] 30: Motor components

[0070] 32: Electric motor stator

[0071] 34: Electric motor rotor

[0072] 36: Crankshaft

[0073] 36a: spindle part

[0074] 36b: Eccentric shaft part

[0075] 39: Main bearing

[0076] 40: Suction communication channel

[0077] 42: Stepped part

[0078] 44: Stairs

Claims

1. A compressor (1), comprising: a sealed container (10); a motor element (30), the motor element (30) being housed in the sealed container (10); a scroll compression element (20) housed in the sealed container (10) and configured to be driven by a crankshaft (36) of the motor element (30); a suction pipe (12) which is installed through the sealed container (10), wherein the gas refrigerant sucked from the outside flows into the scroll compression element (20), and The scroll compression element (20) includes a fixed scroll (22) and a movable scroll (26), wherein the fixed scroll (22) includes a fixed scroll spiral wrap (22b), and the movable scroll (26) includes a movable scroll spiral wrap (26b). The movable scroll spiral wrap (26b) is configured to engage with the fixed scroll spiral wrap (22b) to form a compression chamber (28) between the fixed scroll spiral wrap (22b) and the movable scroll spiral wrap (26b), and the movable scroll (26) is configured to orbit relative to the fixed scroll (22). wherein the fixed scroll (22) includes a suction communication passage (40) formed so that the refrigerant flowing through the suction pipe (12) is guided to the compression chamber (28); and The suction communication passage (40) is formed so that a cross-sectional shape of the suction communication passage (40) includes a stepped portion (42) formed by a plurality of steps (44) in a vertical cross-sectional view taken along a plane in a direction of a flow path passing through the suction communication passage (40).

2. The compressor (1) according to claim 1, wherein When viewed from the side where the fixed scroll (22) is engaged with the movable scroll (26), the stepped portion (42) is formed so that the cross-sectional shape of the suction communication passage (40) becomes lower with each step (44), and so that the length of the curve at the outermost point of each step (44) is longer than the length of the curve at the innermost point of each step (44) relative to the center of the fixed scroll (22).

3. The compressor (1) according to claim 2, wherein The stepped portion (42) is formed such that the stepped portion (42) has a stepped shape along an outer wall (22d) of the fixed scroll spiral wrap (22b).

4. A method for manufacturing a compressor (1) according to claim 1, the method comprising: The plurality of steps (44) are cut from the suction communication passage (40) of the fixed scroll (22) on the side where the fixed scroll (22) is engaged with the movable scroll (26), The stepped portion (42) of the suction communication passage (40) is formed by cutting the suction communication passage (40) for each step (44).

5. The method according to claim 4, wherein The suction communication passage (40) is cut for each step (44) in order from a lower step to a higher step from a side where the fixed scroll (22) and the movable scroll (26) are joined.

6. The method according to claim 4, wherein: The stepped portion (42) of the suction communication passage (40) can be formed by an end mill machining method.

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