Piping branch device and compressor

Abstract

Provided is a pipe branching device including a main pipe and a branch pipe branched from the main pipe, wherein the main pipe includes a first pipe and a second pipe fitted into the first pipe in an axial direction of the first pipe, a chamber communicating with the branch pipe is provided between the first pipe and the second pipe, and a flow path communicating from an inside of the second pipe to the chamber is provided.

Description

Technical Field

[0001] This invention relates to a piping branching device and a compressor.

[0002] This application claims priority based on patent application No. 2021-100383, filed on June 16, 2021, the contents of which are incorporated herein by reference. Background Technology

[0003] In fluid machinery such as turbomachinery, a branch pipe is used to extract the main flow in order to improve controllability. In this structure, if a valve is installed midway through the branch pipe, a pressure loss occurs due to the main flow entering the branch pipe.

[0004] Patent Document 1 discloses a valve body that fits into a flow divider hole provided on a scroll section to reduce pressure loss caused by the main flow into a branch pipe. The valve body is configured such that, in the closed state, it forms an inner surface along the inner wall of the scroll section.

[0005] Previous technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2012 / 157598 Summary of the Invention

[0008] The technical problem to be solved by the invention

[0009] However, in the conventional structure shown in Patent Document 1, the layout and shape of the valve body need to be designed according to the specifications of each compressor housing (fluid machinery), which is not suitable for mass production.

[0010] The present invention was made in view of the above-mentioned problems, and its purpose is to provide a piping branch device and compressor suitable for mass production.

[0011] means for solving technical problems

[0012] To achieve the above objectives, the piping branching device according to the present invention includes a main pipe and branch pipes branching from the main pipe, wherein,

[0013] The main pipe includes a first pipe and a second pipe axially fitted into the first pipe.

[0014] A chamber communicating with the branch pipe is provided between the first pipe and the second pipe.

[0015] It is also provided with a flow path that connects the inside of the second piping to the chamber.

[0016] Invention Effects

[0017] According to the piping branching device of the present invention, a piping branching device can be provided that does not require designing the layout and shape of the valve body for the specifications of each fluid machinery, and is suitable for mass production. Attached Figure Description

[0018] Figure 1 This is a longitudinal sectional view that roughly represents the piping branching device involved in Embodiment 1.

[0019] Figure 2 It is along Figure 1 The sectional view of the piping branch assembly shown is taken along line II-II.

[0020] Figure 3 It is along Figure 1 The sectional view of the piping branch assembly shown is taken along line III-III.

[0021] Figure 4 It means Figure 3 A diagram showing a modified example of a branch pipe in a piping branching device.

[0022] Figure 5 This is a longitudinal sectional view that schematically represents a variation of the piping branching device according to Embodiment 1.

[0023] Figure 6 This is a longitudinal sectional view of a modified example 2 of the piping branching device according to embodiment 1.

[0024] Figure 7 This is a longitudinal sectional view of a modified example 3 of the piping branching device according to embodiment 1.

[0025] Figure 8 This is a perspective view that roughly shows the appearance of the compressor using the piping branch device according to Embodiment 1.

[0026] Figure 9 This is a longitudinal sectional view that roughly represents the piping branching device involved in Embodiment 2.

[0027] Figure 10 It is along Figure 9 The sectional view of the piping branching device shown is taken along line XX.

[0028] Figure 11 It is along Figure 9 The sectional view of the piping branching device shown is taken along line XI-XI.

[0029] Figure 12 It means Figure 9 A diagram showing a modified example of the flow path of the piping branching device.

[0030] Figure 13This is a longitudinal sectional view that schematically represents a variation of the piping branching device according to Embodiment 2, Example 1.

[0031] Figure 14 This is a longitudinal sectional view of a modified example 2 of the piping branching device according to embodiment 2.

[0032] Figure 15 This is a longitudinal sectional view of a modified example 3 of the piping branching device according to embodiment 2.

[0033] Figure 16 This is a perspective view that roughly shows the appearance of the compressor using the piping branch device according to Embodiment 2. Detailed Implementation

[0034] Hereinafter, the piping branching device and compressor according to embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention; they are merely illustrative examples.

[0035] The piping branching device involved in the implementation can be used in fluid machinery such as turbomachinery, for example, as described later, in a compressor suitable for a turbocharger.

[0036] [Implementation Method 1]

[0037] Figure 1 This is a longitudinal sectional view that schematically represents the piping branching device 1A according to Embodiment 1. Figure 2 It is along Figure 1 The cross-sectional view of the piping branch assembly 1A shown is taken along line II-II. Figure 3 It is along Figure 1 The cross-sectional view of the piping branch unit 1A shown is taken along line III-III.

[0038] like Figure 1 As shown, the piping branching device 1A involved in Embodiment 1 is a piping branching device having a main pipe 3A and a branch pipe 5A branching from the main pipe 3A.

[0039] The main pipe 3A includes a first pipe 31A and a second pipe 35A axially fitted into the first pipe 31A. For example, the first pipe 31A and the second pipe 35A are round pipes and can use standard products specified in Japanese Industrial Standards (JIS).

[0040] exist Figure 1In the example shown, in the main flow direction of the main pipe 3A, the first pipe 31A is located downstream, and the second pipe 35A is located upstream. Furthermore, in Figure 1 In the example shown, a rectangular annular groove 351A is provided on the second pipe 35A, and the second pipe 35A and the first pipe 31A are sealed by an O-ring 36A fitted into the annular groove 351A.

[0041] A chamber 6A communicating with a branch pipe 5A is provided between the first pipe 31A and the second pipe 35A, and a flow path 4A is provided from the interior of the second pipe 35A to the chamber 6A. The chamber 6A is a space provided between the first pipe 31A and the second pipe 35A, for example, covering the entire outer circumference of the second pipe 35A. According to this structure, fluid from the main branch flowing in the main pipe 3A flows to the branch pipe 5A through the flow path 4A and the chamber 6A.

[0042] Based on this structure, a piping branching device 1A suitable for mass production can be provided.

[0043] The flow path 4A is divided by an expansion section 41A and an inclined section 43A. The expansion section 41A is provided on the first pipe 31A and gradually expands towards the second pipe 35A. The inclined section 43A is provided at the end of the second pipe 35A. The wall thickness of the inclined section 43A gradually decreases towards the pipe side towards the expansion section 41A. For example, the inner circumferential surface of the expansion section 41A is formed by a conical surface that expands towards the second pipe 35A at a certain proportion, and the surface of the inclined section 43A opposite to the expansion section 41A is formed by an inclined surface or a conical surface that is inclined towards the expansion section 41A at a certain proportion.

[0044] With this structure, a flow path 4A communicating with the chamber 6A is defined between the inclined portion 43A and the expansion portion 41A, thereby reducing pressure loss caused by the main flow into the chamber 6A. Therefore, a piping branch device 1A can be provided, which, like a valve body fitted into a branching orifice provided on the scroll portion, does not require designing the layout and shape of the valve body for the specifications of each fluid machine (e.g., compressor housing), making it suitable for mass production.

[0045] In the piping branching device 1A according to Embodiment 1, the branching position of the branch pipe 5A is set at a position upstream of the flow path 4A between the inclined section 43A and the expansion section 41A in the flow direction of the main flow in the main pipe 3A.

[0046] According to this structure, the fluid flowing in the branch pipe 5A, which draws out a portion of the main flow in the main pipe 3A, flows against the main flow at an acute angle. Therefore, by suppressing the main flow into the chamber 6A, the pressure loss caused by the main flow into the chamber 6A can be reduced.

[0047] like Figure 1 As shown, in the piping branch device 1A according to Embodiment 1, the first pipe 31A and the second pipe 35A are circular pipes. A fitting portion 313A is provided at the inlet end of the first pipe 31A to fit with the second pipe 35A, and the second pipe 35A and the first pipe 31A are sealed at the fitting portion 313A. Therefore, the inner diameter D1A of the fitting portion 313A at the inlet end of the first pipe 31A is the same as the outer diameter D2A of the fitting portion at the outlet end of the second pipe 35A.

[0048] like Figures 1 to 3 As shown, in the piping branching device 1A according to Embodiment 1, an abutment portion 45A is provided at a position different from the inclined portion 43A in the circumferential direction at the end of the second piping 35A, which abuts against the expansion portion 41A. Figure 2 As shown, for example, inclined portions 43A are provided at various positions where the end of the second pipe 35A is equally divided in the circumferential direction, and abutment portions 45A are provided over the entire area between the inclined portions 43A. Figure 2 In the example shown, inclined portions 43A are provided at each of the three circumferentially divided positions of the end of the second pipe 35A, and abutment portions 45A are provided over the entire area between the inclined portions 43A. For example, the front end of the abutment portion 45A is formed into a semi-circular cross-section.

[0049] According to this structure, by making the contact portion 45A abut against the expansion portion 41A, the flow path 4A can be provided only between the inclined portion 43A and the expansion portion 41A.

[0050] In the piping branch device 1A according to Embodiment 1, the cross-sectional area of ​​the flow path 4A is the same as the cross-sectional area of ​​the branch pipe 5A. For example, as Figure 2 As shown, when the end of the second pipe 35A is provided with inclined portions 43A at each of the three positions that are divided into three equal parts in the circumferential direction, and a flow path 4A is provided between the inclined portions 43A and the expansion portions 41A, the total flow path cross-sectional area of ​​these three flow paths 4A is the same as the flow path cross-sectional area of ​​the branch pipe 5A.

[0051] This structure allows the velocity of the fluid drawn from the main pipe 3A to the branch pipe 5A to be constant.

[0052] As described above, the branch pipe branches from the main pipe 3A, for example, such as Figure 2 and Figure 3 As shown, it extends radially outward from the main pipe 3A, but as Figure 4 As shown, it can also extend in the tangential direction to the annular chamber 6A located between the first pipe 31A and the second pipe 35A.

[0053] Figures 5 to 7This is a longitudinal sectional view of the piping branching device 1A1 to 1A3, which are modified examples of the piping branching device 1A according to Embodiment 1. Figures 5 to 7 As shown, flow path 4A is a hole 352A, an elongated hole 353A, or a slit 354A provided on the second pipe 35A.

[0054] like Figure 5 As shown, in the pipe branching device 1A1 according to Modified Example 1, the flow path 4A is a hole 352A provided on the second pipe 35A. The hole 352A can be one or more, for example, it can be an inclined hole that gradually slopes downstream of the main flow direction from the radially outer side of the second pipe 35A towards the inner side. When there are two or more holes 352A, they can be staggered in the axial direction of the second pipe 35A. Furthermore, although not specifically illustrated, the holes can be arranged in a row in the axial direction of the second pipe 35A, or they can be arranged in a row on each of the radial sides of the second pipe 35A (a total of two rows). Based on this structure, a pipe branching device 1A1 suitable for mass production can be provided.

[0055] Furthermore, in the piping branching device 1A1 according to Modified Example 1, the branching position of the branch pipe 5A is located upstream of the orifice 352A provided on the second pipe 35A in the direction of the main flow in the main pipe 3A. According to this structure, the flow of fluid in the flow path 4A, which draws out a portion of the main flow in the main pipe 3A, flows against the main flow. Therefore, by suppressing the main flow into the flow path 4A, pressure loss caused by the main flow into the chamber 6A can be reduced.

[0056] like Figure 6 As shown, in the piping branching device 1A2 of Modified Example 2, the flow path 4A is an elongated orifice 353A provided on the second piping 35A. The elongated orifice 353A can be one or more, for example, formed by an inclined orifice that gradually slopes downstream of the main flow direction from the radially outer side towards the inner side of the second piping 35A. When there are two or more elongated orifices 353A, they are provided at positions that are equally divided circumferentially on the second piping 35A.

[0057] Furthermore, in the piping branching device 1A2 according to Modified Example 2, the branching position of the branch pipe 5A is located upstream of the main flow direction in the main pipe 3A, compared to the elongated orifice 353A provided on the second pipe 35A. With this structure, the flow of fluid in the flow path 4A, which draws out a portion of the main flow in the main pipe 3A, flows against the main flow. Therefore, by suppressing the main flow into the flow path 4A, pressure loss caused by the main flow into the chamber 6A can be reduced.

[0058] like Figure 7As shown, in the piping branch device 1A3 involved in Modified Example 3, the flow path 4A is a slit 354A provided at the end of the second piping 35A. There are one or more slits 354A. When there are two or more slits 354A, they are provided, for example, at positions that are equally divided in the circumference of the second piping 35A.

[0059] Furthermore, in the piping branching device 1A3 according to Modified Example 3, the branching position of the branch pipe 5A is located upstream of the slit 354A provided on the second pipe 35A in the flow direction of the main flow in the main pipe 3A. According to this structure, the flow of fluid in the flow path 4A, which draws out a portion of the main flow in the main pipe 3A, flows against the main flow. Therefore, by suppressing the main flow into the flow path 4A, pressure loss caused by the main flow into the chamber 6A can be reduced.

[0060] Figure 8 This is a perspective view that roughly shows the appearance of the compressor 7 using the piping branch device 1A according to Embodiment 1.

[0061] like Figure 8 As shown, the piping branch device 1A according to Embodiment 1 is provided, for example, on the compressor 7 constituting the turbocharger. In the piping branch device 1A according to Embodiment 1 provided on the compressor 7, the second piping 35A is the outlet piping 71, and the branch pipe 5A is a branch pipe 5A that draws out a portion of the main flow flowing in the outlet piping 71.

[0062] According to this structure, a portion of the compressed air (mainstream) can be drawn from the flow path 4A to the branch pipe 5A at the outlet of the compressor 7.

[0063] [Implementation Method 2] Figure 9 This is a longitudinal sectional view that schematically represents the piping branching device 1B according to Embodiment 2. Figure 10 It is along Figure 9 The sectional view of the piping branch device 1B shown is taken along line XX. Figure 11 It is along Figure 9 The cross-sectional view of the piping branch assembly 1B shown is taken along line XI-XI. (See attached image.) Figure 9 As shown, the piping branching device 1B involved in Embodiment 2 is a pipe having a main pipe 3B and a branch pipe 5B branching from the main pipe 3B (see reference). Figure 10 Piping branch unit 1B.

[0064] The main pipe 3B includes a first pipe 31B and a second pipe 35B axially fitted into the first pipe 31B. For example, the first pipe 31B and the second pipe 35B are round pipes and can use standard products specified in the Japanese Industrial Standards (JIS).

[0065] exist Figure 9 In the example shown, in the main flow direction of the main pipe 3B, the first pipe 31B is located on the upstream side, and the second pipe 35B is located on the downstream side. Furthermore, in... Figure 9 In the example shown, a rectangular annular groove 351B is provided on the second pipe 35B, and the second pipe 35B and the first pipe 31B are sealed by an O-ring 36B fitted into the annular groove 351B.

[0066] A chamber 6B communicating with a branch pipe 5B is provided between the first pipe 31B and the second pipe 35B, and a flow path 4B communicating from the interior of the second pipe 35B to the chamber 6B is provided. Figure 9 In the example shown, an outer peripheral end 311B and an inner peripheral end 312B are provided at the end of the first pipe 31B, and a chamber 6B is provided between the outer peripheral end 311B and the inner peripheral end 312B. The outer peripheral end 311B and the inner peripheral end 312B are double-layered pipes arranged around the same axis, and a flow path 4B is provided at the inner peripheral end 312B. According to this structure, the fluid flowing in the branch pipe 5B merges with the main flow flowing in the main pipe 3B through the chamber 6B and the flow path.

[0067] Based on this structure, a piping branching device 1B suitable for mass production can be provided.

[0068] The flow path 4B is divided by an expansion section 41B and an inclined section 43B. The expansion section 41B is provided on the second pipe 35B and gradually expands towards the first pipe 31B. The inclined section 43B is provided at the inner circumferential end 312B of the first pipe 31B. The wall thickness of the inclined section 43B gradually decreases towards the pipe side towards the expansion section 41B. For example, the inner circumferential surface of the expansion section 41B is composed of a conical surface that expands towards the first pipe 31B at a certain proportion, and the surface of the inclined section 43B opposite to the expansion section 41B is composed of an inclined surface or a conical surface that is inclined towards the expansion section 41B at a certain proportion.

[0069] With this structure, a flow path 4B communicating with the chamber 6B is demarcated between the inclined portion 43B and the expansion portion 41B, thereby reducing interference when the fluid flowing in the chamber 6B merges with the main flow in the main pipe 3B. Furthermore, a piping branching device 1B can be provided that eliminates the need to design the layout and shape of the branch pipes 5B for the specifications of each fluid machine (e.g., compressor housing), making it suitable for mass production.

[0070] In the piping branch device 1B according to Embodiment 2, the branch position of the branch pipe 5B is set at a position upstream of the flow path 4B between the inclined part 43B and the expansion part 41B in the flow direction of the main flow in the main pipe 3B.

[0071] According to this structure, the flow of fluid in branch pipe 5B, which merges with the mainstream flow in main pipe 3B, merges with the mainstream at an acute angle. Therefore, the flow of fluid in branch pipe 5B is less likely to interfere with the flow of the mainstream, thus suppressing the reduction in efficiency.

[0072] In the piping branching device 1B according to Embodiment 2, the first pipe 31B and the second pipe 35B are circular pipes. A fitting portion 313B is provided at the outer peripheral end 311B of the first pipe 31B to fit with the second pipe 35B, and the second pipe 35B and the first pipe 31B are sealed at the fitting portion 313B. Therefore, the inner diameter D1B of the fitting portion 313B provided at the inlet end of the first pipe 31B is the same as the outer diameter D2B of the second pipe 35B.

[0073] like Figure 11 As shown, in the piping branch device 1B according to Embodiment 2, the inclined portion 43B is provided around the circumference of the inner circumferential end 312B. Figure 9 As shown, the surface of the inclined portion 43B opposite to the expanded portion 41B is composed of a conical surface inclined at a certain proportion toward the expanded portion 41B, and extends circumferentially throughout the flow path 4B at the inner circumferential end 312B. Figure 9 In the example shown, an inclined portion 43B is provided at the inner peripheral end 312B of the first pipe 31B, and the outer peripheral end 311B is fitted with the second pipe 35B. Furthermore, by making the outer peripheral end 311B of the first pipe 31B abut against the abutting portion 45B provided on the outer periphery of the second pipe 35B, a flow path 4B is defined between the expansion portion 41B and the inclined portion 43B.

[0074] Based on this structure, a circumferentially divided flow path 4B extends throughout the ends.

[0075] like Figure 12 As shown, in the piping branch device 1B according to Embodiment 2, a plurality of inclined portions 43B may be provided in the circumferential direction of the inner circumferential end 312B. The surface of the inclined portion 43B opposite to the expansion portion 41B is composed of a conical surface inclined toward the expansion portion 41B at a certain proportion, and flow paths 4B are divided at equal intervals in the circumferential direction of the inner circumferential end 312B. Figure 12 In the example shown, four inclined portions 43B are provided at equal intervals on the inner peripheral end 312B of the first pipe 31B, and the outer peripheral end 311B is fitted with the second pipe 35B. Moreover, by making the outer peripheral end 311B of the first pipe 31B abut against the abutting portion 45B provided on the outer periphery of the second pipe 35B, a flow path 4B is defined between the expansion portion 41B and the inclined portions 43B.

[0076] Figures 13 to 15This is a longitudinal sectional view of the piping branch device 1B1 to 1B3, which is a simplified representation of a modified example of the piping branch device 1B according to Embodiment 2. Figures 13 to 15 As shown, flow path 4B is a hole 315B, an elongated hole 316B, or a slit 317B located at the inner peripheral end 312B of the first pipe 31B.

[0077] like Figure 13 As shown, in the pipe branching device 1B1 according to Modification 1, the flow path 4B is a hole 315B provided at the inner circumferential end 312B of the first pipe 31B. The hole 315B can be one or more, for example, formed by an inclined hole that gradually slopes downstream of the main flow direction from the radially outer side of the inner circumferential end 312B of the first pipe 31B towards the inner side. When there are two or more holes 315B, they can be staggered axially in the first pipe 31B (inner circumferential end 312B). Furthermore, although not specifically illustrated, the holes can be arranged in a row axially in the first pipe 31B (inner circumferential end 312B), or they can be arranged in rows (two rows in total) on both radially sides of the first pipe 31B (inner circumferential end 312B). Based on this structure, a pipe branching device 1B1 suitable for mass production can be provided.

[0078] Furthermore, in the piping branching device 1B1 according to Modification 1, the branching position of the branch pipe 5B is located upstream of the orifice 315B on the first pipe 31B (inner circumferential end 312B) in the direction of the main flow in the main pipe 3B. According to this structure, the flow of fluid in the flow path 4B, which merges with the main flow in the main pipe 3B, merges with the main flow at an acute angle relative to the main flow. Therefore, the flow of fluid in the flow path 4B is less likely to interfere with the flow of the main flow, and the reduction in efficiency can be suppressed.

[0079] like Figure 14 As shown, in the piping branch device 1B2 of Modified Example 2, the flow path 4B is an elongated hole 316B provided at the inner circumferential end 312B of the first pipe 31B. The elongated hole 316B can be one or more, for example, formed by an inclined hole that gradually slopes downstream of the main flow direction from the radially outer side of the inner circumferential end 312B of the first pipe 31B towards the inner side. When there are two or more elongated holes 316B, they are provided at positions that are equally divided circumferentially at the inner circumferential end 312B of the first pipe 31B.

[0080] Furthermore, in the piping branching device 1B2 according to Modification Example 2, the branching position of the branch pipe 5B is located upstream of the elongated hole 316B located at the inner circumferential end 312B of the first pipe 31B, in the direction of the main flow in the main pipe 3B. According to this structure, the flow of fluid in the flow path 4B, which merges with the main flow in the main pipe 3B, merges with the main flow at an acute angle relative to the main flow. Therefore, the flow of fluid in the flow path 4B is less likely to interfere with the flow of the main flow, and the reduction in efficiency can be suppressed.

[0081] like Figure 15 As shown, in the piping branch device 1B3 of Modified Example 3, the flow path 4B is a slit 317B provided at the inner circumferential end 312B of the first pipe 31B. There are one or more slits 317B. When there are two or more slits 317B, for example, they are provided at positions that are equally divided in the circumferential direction at the inner circumferential end 312B of the first pipe 31B.

[0082] Furthermore, in the piping branching device 1B3 according to Modification 3, the branching position of the branch pipe 5B is located upstream of the slit 317B located at the inner circumferential end 312B of the first pipe 31B, in the direction of the main flow in the main pipe 3B. According to this structure, the flow of fluid in the flow path 4B, which merges with the main flow in the main pipe 3B, merges with the main flow at an acute angle relative to the main flow. Therefore, the flow of fluid in the flow path 4B is less likely to interfere with the flow of the main flow, and the reduction in efficiency can be suppressed.

[0083] Figure 16 This is a diagram that roughly shows the appearance of the compressor 8 using the piping branch device 1B according to Embodiment 2.

[0084] like Figure 16 As shown, the piping branch device 1B according to Embodiment 2 is provided, for example, on the compressor 8 constituting the turbocharger. In the piping branch device 1B according to Embodiment 2 provided on the compressor 8, the second piping 35B is the inlet piping 81, and the branch pipe 5B is the confluence pipe for fluid flowing into the main flow in the inlet piping 81.

[0085] This structure allows the gas to merge with the mainstream at the inlet of compressor 8.

[0086] The present invention is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0087] The contents described in the above embodiments are as follows.

[0088] [1] One method involves a piping branching device (1A, 1B) comprising a main pipe (3A, 3B) and branch pipes (5A, 5B) branching from the main pipe (3A, 3B), wherein,

[0089] The main pipes (3A, 3B) include a first conduit (31A, 31B) and a second conduit (35A, 35B) axially fitted into the first conduit (31A, 31B).

[0090] A chamber (6A, 6B) communicating with the branch pipe (5A, 5B) is provided between the first pipe (31A, 31B) and the second pipe (35A, 35B).

[0091] It is also provided with flow paths (4A, 4B) connecting the inside of the second piping (35A, 35B) to the chamber (6A, 6B).

[0092] Based on this structure, a piping branching device (1A, 1B) suitable for mass production can be provided.

[0093] [2] The other method involves piping branching devices (1A, 1B) as described in [1], wherein,

[0094] The flow paths (4A, 4B) are divided by expansion sections (41A, 41B) and inclined sections (43A, 43B). The expansion sections (41A, 41B) are provided on either the first pipe (31A, 31B) or the second pipe (35A, 35B) and gradually expand towards the other. The inclined sections (43A, 43B) are provided at the end of the other of the first pipe (31A, 31B) or the second pipe (35A, 35B) and their wall thickness gradually decreases towards the expansion sections (41A, 41B).

[0095] With this structure, the flow paths (4A, 4B) are divided by inclined sections (43A, 43B) and expansion sections (41A, 41B), thus reducing pressure loss caused by the main flow into the branch pipes (5A, 5B). Therefore, it is possible to provide a piping branch device (1A, 1B) that, like a valve body fitted into a diversion hole provided on a scroll section, does not require designing the layout and shape of the valve body for the specifications of each fluid machine (e.g., compressor housing), making it suitable for mass production.

[0096] [3] The other method involves piping branching devices (1A, 1B) as described in [2], wherein,

[0097] The branch positions of the branch pipes (5A, 5B) are located upstream of the main flow path (4A, 4B) in the direction of the main flow in the main pipe (3A, 3B).

[0098] According to this structure, the fluid flowing in the branch pipe (5A), which extracts a portion of the mainstream flow in the main pipe (3A), flows against the mainstream at an acute angle. Therefore, the inflow of the mainstream into the branch pipe (5A) can be suppressed, reducing pressure loss caused by the mainstream flowing into the branch pipe (5A). Furthermore, the fluid flowing in the branch pipe (5B), which merges with the mainstream flow in the main pipe (3B), merges with the mainstream at an acute angle. Therefore, the fluid flow in the branch pipe (5B) is less likely to interfere with the mainstream flow, suppressing any reduction in efficiency.

[0099] [4] Another approach involves a piping branch device (1A) as described in [2] or [3], wherein,

[0100] An abutting portion (45A) is provided at a position on the end of the circumference that is different from that of the inclined portion (43A) to abut against the expansion portion (41A).

[0101] According to this structure, by abutting the abutting part (45A) and expanding part (41A), a flow path (4A) can be provided only between the inclined part (43A) and expanding part (41A).

[0102] [5] The other embodiment involves a piping branch device (1B) as described in any one of [1] to [4], wherein,

[0103] The inclined portion (43B) is disposed around the circumference of the end.

[0104] Based on this structure, a circumferentially full-circumference flow path (4B) is defined throughout the ends.

[0105] [6] The other embodiment involves a piping branching device (1A, 1B) as described in any one of [1] to [5], wherein,

[0106] The flow path cross-sectional area of ​​the flow path (4A, 4B) is the same as that of the branch pipe (5A, 5B).

[0107] According to this structure, the velocity of the fluid drawn from the main pipe (3A, 3B) to the branch pipe (5A, 5B) can be kept constant, and the velocity of the fluid flowing from the branch pipe (5A, 5B) back to the main pipe (3A, 3B) can be kept constant.

[0108] [7] Another approach involves a piping branching device (1A1, 1A2, 1A3) that is the piping branching device (1A) described in [1], wherein,

[0109] The flow path (4A) is a hole (352A), an elongated hole (353A), or a slit (354A) provided on the second pipe (35A).

[0110] Based on this structure, a piping branching device (1A1, 1A2, 1A3) suitable for mass production can be provided.

[0111] [8] Another approach involves a piping branching device (1B1, 1B2, 1B3) that is the piping branching device (1B) described in [1], wherein,

[0112] The second pipe (35B) has:

[0113] The outer peripheral end (311B) is disposed on the outside of the second pipe (35B) and engages with the first pipe (31B); and

[0114] The inner peripheral end (312B) is located inside the second pipe (35B) and forms a double-layer pipe with the outer peripheral end (311B).

[0115] The flow path (4B) is a hole (315B), an elongated hole (316B), or a slit (317B) provided at the inner peripheral end (312B).

[0116] Based on this structure, a piping branching device (1B1, 1B2, 1B3) suitable for mass production can be provided.

[0117] [9] The compressor (7) involved includes the piping branching device (1A, 1A1, 1A2, 1A3) as described in any one of [1] to [7].

[0118] The second piping (35A) is the outlet piping (71).

[0119] According to this structure, a portion of the compressed air can be drawn from the flow path (4A) to the branch pipe (5A) at the outlet.

[0120]

[10] The compressor (8) involved has a piping branching device (1B, 1B1, 1B2, 1B3) as described in any one of [1] to [6] or [8].

[0121] The second piping (35B) is the inlet piping (81).

[0122] This structure allows the gas to merge with the mainstream at the inlet.

[0123] Symbol Explanation

[0124] 1A, 1B - Piping branch device; 3A, 3B - Main pipe; 31A, 31B - First piping; 311B - Outer peripheral end; 312B - Inner peripheral end; 313A, 313B - Fitting part; 315B - Hole; 316B - Long hole; 317B - Slit; 35A, 35B - Second piping; 351A, 351B - Ring groove; 352A - Hole; 353A - Long hole; 354A - Slit; 36A, 36B - O-ring; 4A, 4B - Flow path; 41A, 41B - Expansion part; 43A, 43B - Inclined part; 45A, 45B - Abutment part; 5A, 5B - Branch pipe; 6A, 6B - Chamber; 7 - Compressor; 71 - Outlet piping; 8 - Compressor; 81 - Inlet piping.

Claims

1. A piping branching device comprising a main pipe and branch pipes branching from the main pipe, wherein, The main pipe includes a first pipe and a second pipe axially fitted into the first pipe. A chamber communicating with the branch pipe is provided between the first pipe and the second pipe. Furthermore, a flow path is provided connecting the interior of the second piping to the chamber. The flow path is divided by an expansion section and an inclined section. The expansion section is located on either the first pipe or the second pipe and gradually expands towards the other. The inclined section is located at the end of the other pipe and its wall thickness gradually decreases towards the expansion section. An abutting portion that abuts against the expansion portion is provided at a position on the circumferential direction of the end portion, which is different from the inclined portion.

2. The piping branching device according to claim 1, wherein, The branch pipe is positioned upstream of the main flow path in the direction of the main flow.

3. The piping branching device according to claim 1, wherein, The cross-sectional area of ​​the flow path is the same as that of the branch pipe.

4. The piping branching device according to claim 1, wherein, The flow path is a hole or slit provided on the second pipe.

5. The piping branching device according to claim 1, wherein, The first piping has: The outer peripheral end is located on the outside of the second pipe and is fitted into the second pipe; and The inner circumferential end is located inside the second pipe and forms a double-layer pipe with the outer circumferential end. The flow path is a hole or slit located at the inner peripheral end.

6. A compressor comprising the piping branching device according to any one of claims 1 to 4, The second piping is the outlet piping.

7. A compressor comprising the piping branching device according to any one of claims 1 to 3 or 5, The second piping is the inlet piping.

Images