CN114679012B

CN114679012B - Space negative pressure heat dissipation motor

Info

Publication number: CN114679012B
Application number: CN202210269791.2A
Authority: CN
Inventors: 应镑蔚
Original assignee: Zhejiang Qiangsu Motor Manufacturing Co ltd
Current assignee: Zhejiang Qiangsu Motor Manufacturing Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2023-07-21
Anticipated expiration: 2042-03-18
Also published as: CN114679012A

Abstract

The application relates to a space negative pressure heat dissipation motor, which comprises a front end cover, a shell body, a rear end cover and a stator-rotor structure, wherein a heat dissipation fan is arranged in the rear end cover, the air inlet side of the heat dissipation fan faces the stator-rotor structure, an air outlet is arranged on the rear end cover, the air outlet side of the heat dissipation fan faces the air outlet, a clamping cavity is arranged in the front end cover, a water inlet connector is arranged on the front end cover and communicated with the clamping cavity, a plurality of water outlet channels are arranged on the front end cover, and a plurality of pressurizing cavities are arranged in the shell body; the shell body is provided with the bulge loop on being close to the lateral wall of front end housing, has offered the runner on the bulge loop, and the runner runs through the bulge loop along the direction of keeping away from the front end housing, runner and pressure boost chamber intercommunication, the clearance between the adjacent fin of runner one-to-one. Through leading to water to the front end housing, water cools off the shell body through the clearance department that pressure boost chamber and runner got into the fin, improves the cooling effect of shell body, makes the difficult overheated of motor, prolongs the life of motor.

Description

Space negative pressure heat dissipation motor

Technical Field

The application relates to the technical field of motor heat dissipation, in particular to a space negative pressure heat dissipation motor.

Background

The heat dissipation fans commonly used for the motor in the related art are two types, namely a centrifugal fan and an axial flow fan, wherein the centrifugal fan sucks one side of the motor to form negative pressure to help the motor to dissipate heat, but the air flow sucked by the centrifugal fan can be refracted by 90 degrees, so that the air flow loss is large due to one suction fold, the heat dissipation efficiency is seriously influenced, the heat dissipation efficiency is lower, the motor is easy to overheat and damage, and the service life of the motor is reduced.

Disclosure of Invention

In order to improve the service life of the motor, the application provides a space negative pressure heat dissipation motor.

The application provides a space negative pressure heat dissipation motor adopts following technical scheme:

the utility model provides a space negative pressure heat dissipation motor, includes front end housing, shell body, rear end housing and is located the stator-rotor structure of shell body, be provided with the radiator fan in the rear end housing, radiator fan's air inlet side is towards stator-rotor structure, be provided with the air outlet on the rear end housing, radiator fan's air outlet side is towards the air outlet, be provided with the clamp chamber in the front end housing, be provided with the water inlet connector that is used for connecting the water pipe on the front end housing, water inlet connector and clamp chamber intercommunication, be provided with a plurality of water outlet channel on the lateral wall of front end housing towards shell body, be provided with a plurality of pressure boost chamber in the shell body, a plurality of pressure boost chamber sets up along the circumference of shell body axis, pressure boost chamber and water outlet channel one-to-one intercommunication are set up;

the shell is provided with a convex ring on the outer side wall of the shell, which is close to the front end cover, a flow channel is arranged on the convex ring, the flow channel penetrates through the convex ring along the direction away from the front end cover, the flow channel is communicated with the pressurizing cavity, the shell is provided with a plurality of cooling fins arranged at intervals, and the flow channels are in one-to-one correspondence with gaps between adjacent cooling fins.

By adopting the technical scheme, the heat dissipation fan pumps air at the stator and rotor structure, so that space negative pressure is formed, and the stator and rotor is cooled;

when the motor is used, only the joint connecting pipe can be sold, the water pipe is connected with the water faucet, the water is injected into the clamping cavity of the faucet box, so that the temperature of the front end cover is kept low, after the water in the clamping cavity is full, the water in the clamping cavity is introduced into the pressurizing cavity from the water storage channel, and flows into the gap between the adjacent cooling fins through the runner on the convex ring, the water can dissipate heat of the outer wall of the shell body, the heat dissipation effect of the motor is improved, the motor is not easy to damage, and the service life of the motor is prolonged.

Optionally, a drain ring is arranged on the outer side wall of the shell far away from the front end cover, the drain ring extends along the circumferential direction of the shell, a drain channel is arranged inside the drain ring, and the drain channel is arranged along the circumferential direction of the drain ring axis; the water inlet is arranged on the side wall of the water draining ring, which faces the convex ring, the water inlets are in one-to-one correspondence with gaps between the radiating fins, the water draining ring is provided with water outlet joints on the side wall, and the water outlet joints are positioned at one end of the water draining ring, which is far away from the water inlet.

Through adopting above-mentioned technical scheme, set up the drainage ring in the one side of keeping away from the front end housing for the water from the runner flows from between the adjacent fin, and is longer to the interval of drainage ring, makes the area that water flowed through great, improves the radiating effect of shell body. The water flowing out of the flow passage enters the drainage ring through the water inlet and is discharged to corresponding places after being connected with the water pipe through the water storage joint. The water outlet connector is positioned at one end of the water draining ring, which is far away from the water inlet, because the axis of the water draining ring is in the horizontal direction when the motor is used, the water inlet is positioned at the top end of the water draining ring, and the water outlet connector is positioned at the bottom of the water draining ring, so that water in the water draining ring can flow out through the water outlet connector conveniently.

Optionally, a plurality of through holes are formed in the shell body, and the through holes are communicated with the pressurizing cavity; the shell is fixedly provided with a silica gel sleeve, a water-filling cavity is arranged in the silica gel sleeve, the water-filling cavity is communicated with the through hole, the silica gel sleeve is in sealing connection with the outer wall of the shell, and the silica gel sleeve is positioned between the adjacent radiating fins; after the silica gel sleeve is filled with water, the outer wall of the silica gel sleeve after being filled with water is abutted against the runner.

By adopting the technical scheme, when the water inlet connector is used for introducing water into the front end cover, the front end cover and the pressurizing cavity are in a state that the water pressure is high, and the silica gel sleeve is bulged after the water enters the water filling cavity, so that the silica gel sleeve can be abutted against the flow channel to control the water yield of the flow channel, prevent the water yield of the flow channel from being excessively high, and further the water is wasted, so that the water saving effect is achieved; the high water pressure is used for flushing the silica gel sleeve, so that water easily flows to the two sides of the silica gel sleeve, which are close to the radiating fins, so that the area of the water flushing on the radiating fins is increased, the radiating area of the shell is increased, and the radiating effect is improved.

Optionally, be provided with the accuse water board between two adjacent fin, the accuse water board is located the one side that the runner was kept away from to the silica gel cover, one side that the shell outer wall was kept away from to the fin is fixed with the connecting strip, the accuse water board is fixed in on the connecting strip, after the silica gel cover fills water, silica gel cover one side butt runner, opposite side butt accuse water board.

Through adopting above-mentioned technical scheme, through setting up the accuse water board for when water pressure is great, the silica gel cover is difficult for being washed away from the runner mouth by water pressure, makes the silica gel cover can better butt six crossing, thereby reaches the effect of control discharge, also makes the rivers wash to the silica gel cover after the convenience to the direction that is close to the fin flow simultaneously.

Optionally, still include the silica gel strip, the interval is equipped with a plurality of connectors on the silica gel strip, fill water chamber and connector one-to-one intercommunication, silica gel cover and silica gel strip integrated into one piece, the silica gel strip is fixed in the outer wall of casing.

Through adopting above-mentioned technical scheme, through with silica gel strip and silica gel cover integrated into one piece setting for when the silica gel cover was installed on the shell body, through with silica gel strip with shell body fixed can, need not to install silica gel cover one by one in the mouth department of using, thereby make silica gel cover simple to operate; meanwhile, the silica gel strip has certain hardness and certain toughness, so that the silica gel strip can be well abutted against the outer wall of the shell body, a good sealing effect is achieved, and water leakage is not easy to occur.

Optionally, be provided with the clamp piece on the silica gel strip, set up the breach that supplies the silica gel cover to pass on the clamp piece, set up the fixed orifices on clamp piece and the silica gel strip, shell, clamp piece and silica gel strip are through wearing to establish bolt or screw fixation in the fixed orifices, the silica gel strip is located between shell outer wall and the clamp piece.

Through adopting above-mentioned technical scheme, through setting up the clamp piece, when the silica gel strip is installed on the shell body outer wall, the clamp piece presss from both sides the silica gel strip tight on the shell body, makes the silica gel strip everywhere hug closely the shell body outer wall that can be better, improves sealed effect, makes the junction of silica gel strip and shell body be difficult for leaking.

Optionally, a water outlet pipe is connected in the water outlet channel, the water outlet pipe is inserted in the pressurizing cavity, and the end part of the water outlet pipe is close to the through hole.

Through adopting above-mentioned technical scheme, outlet pipe tip is close to the opening for in the convenient entering silica gel cover of water, when making difficult appearance passageway interior water, the condition that the silica gel cover did not bulge.

Optionally, a sealing ring is sleeved on the water outlet pipe, and the joint of the pressurizing cavity and the water outlet pipe is sealed.

By adopting the technical scheme, the sealing ring is arranged, so that water leakage is not easy to occur at the joint of the pressurizing cavity and the water outlet pipe.

Optionally, one side of silica gel cover towards the runner is provided with two guide inclined planes, and two guide inclined planes are located the silica gel cover along being close to the both ends of fin, along being close to the direction of fin, guide inclined plane is along keeping away from the direction slope of bulge loop.

Through the technical scheme, the guide inclined plane enables water which is stamped on the silica gel sleeve to flow in the direction of the radiating fins easily, and the water is not easy to splash in the direction away from the shell.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through leading water into the front end cover, the water enters the gap of the cooling fin through the pressurizing cavity and the flow channel to cool the shell body, so that the cooling effect of the shell body is improved, the motor is not easy to overheat, and the service life of the motor is prolonged;

2. through setting up the silica gel cover, the silica gel cover can control rivers, places rivers great, practices thrift the water, and the silica gel cover changes the flow direction of rivers, and rivers can more contact fin, makes the radiating effect of fin better, makes the motor difficult overheated;

3. the water control plate enables the silica gel sleeve to be well abutted against the runner, so that the silica gel sleeve can keep a good water control effect.

Drawings

Fig. 1 is an overall schematic diagram of a heat dissipating motor of an embodiment of the present application.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is an enlarged view at a of fig. 2, mainly showing the structure at the flow passage.

Fig. 4 is a schematic structural view of the silica gel strip, the clamping piece and the silica gel cover of the embodiment.

Reference numerals illustrate: 1. a housing; 11. a front end cover; 111. clamping a cavity; 112. a water inlet joint; 113. a water outlet channel; 114. a water outlet pipe; 12. a shell body; 121. a pressurizing chamber; 122. a through port; 123. a heat sink; 13. a rear end cover; 131. an air outlet; 2. a stator-rotor structure; 3. a base; 4. a heat radiation fan; 5. a seal ring; 6. a convex ring; 61. a flow passage; 7. a connecting strip; 71. a water control plate; 8. a silica gel strip; 81. a connection port; 82. a silica gel sleeve; 822. a guide slope; 821. a water-filling cavity; 83. a clamping piece; 831. a notch; 9. a drainage ring; 91. a drainage channel; 92. a water inlet; 93. and a water outlet joint.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

The embodiment of the application discloses a space negative pressure heat dissipation motor. Referring to fig. 1 and 2, the space negative pressure heat dissipation motor includes a housing 1, a stator and rotor structure 2 located in the housing 1, and a base 3 located on an outer wall of the housing 1, and the housing 1 includes a front end cover 11, a housing body 12, and a rear end cover 13. The front end cover 11 and the rear end cover 13 are fixed at two axial ends of the shell 12 through bolts, and the stator and rotor structure 2 is installed in the shell 12.

Referring to fig. 1 and 2, the space negative pressure heat dissipation motor further comprises a heat dissipation fan 4, the heat dissipation fan 4 is rotatably connected in the rear end cover 13, an air outlet 131 is formed in one side, far away from the shell body 12, of the rear end cover 13, an air inlet side of the heat dissipation fan 4 faces the stator and rotor structure 2, and an air outlet side of the heat dissipation fan 4 faces the air outlet 131. The heat radiation fan 4 rotates and then pumps air to the inner cavity of the shell body 12 to form negative pressure, so that hot air in the shell body 12 is discharged out of the shell body 12, and the aim of cooling is fulfilled.

Referring to fig. 1 and 2, when the housing 1 is supported on the ground by the base 3, the axis of the housing 1 is in the horizontal direction. The front end cover 11 is internally provided with a clamping cavity 111, the bottom of the front end cover 11 is connected with a water inlet joint 112, and the water inlet joint 112 is communicated with the clamping cavity 111. Five water outlet channels 113 are formed in the side wall, facing the shell 12, of the top of the front end cover 11, five pressurizing cavities 121 are formed in the end face, facing the front end cover 11, of the shell 12, the pressurizing cavities 121 are in one-to-one correspondence with the water outlet channels 113, and when the front end cover 11 is installed on the shell 12, the pressurizing cavities 121 are communicated with the water outlet channels 113.

Referring to fig. 3, a water outlet pipe 114 is fixed in the water outlet channel 113, and the water outlet pipe 114 is inserted into the pressurizing cavity 121. The water outlet pipe 114 is sleeved with a sealing ring 5, the sealing ring 5 is clamped between the front end cover 11 and the shell 12, and the sealing ring 5 is used for sealing and connecting the pressurizing cavity 121 and the joint of the water outlet pipe 114.

Referring to fig. 1 and 3, a collar 6 is fixed to the end side wall of the housing body 12 near the front cover, and the collar 6 extends in the circumferential direction of the axis of the housing body 12. Five flow channels 61 are formed in the convex ring 6, one ends of the flow channels 61 are communicated with the pressurizing cavities 121 in a one-to-one correspondence mode, and the other ends of the flow channels 61 extend to one side, far away from the front section cover, of the convex ring 6.

Referring to fig. 1, a plurality of heat dissipation fins 123 are fixed on the circumferential outer wall of the housing 12 at intervals, and the length direction of the heat dissipation fins 123 is parallel to the length direction of the axis of the housing 12.

Referring to fig. 1 and 3, the flow channels 61 are in one-to-one correspondence with the gaps between the adjacent fins 123 and the end facing away from the front cover 11.

Referring to fig. 3 and 4, a silica gel strip 8 is fixed on the outer wall of the housing 12, five connection ports 81 are spaced apart from each other on the silica gel strip 8, and the connection ports 81 are arranged along the length direction of the silica gel strip 8. The silica gel strip 8 is integrally formed with a silica gel sleeve 82, the silica gel sleeve 82 is provided with a water filling cavity 821, the silica gel sleeve 82 is arranged in one-to-one correspondence with the connecting ports 81, and the water filling cavity 821 is communicated with the connecting ports 81 in one-to-one correspondence.

Referring to fig. 3 and 4, when the silica gel strip 8 is fixed on the shell 12, the silica gel sleeve 82 is located at one side of the silica gel strip 8 away from the outer wall of the shell 12, a clamping piece 83 is fixed at one side of the silica gel strip 8 away from the shell 12, and a notch 831 for the silica gel sleeve 82 to penetrate out is formed in the clamping piece 83. And all offered the fixed orifices on clamping piece 83 and the silica gel strip 8, clamping piece 83 and silica gel strip 8 are fixed in the outer wall of shell body 12 through wearing to establish screw or bolt, clamping piece 83 compresses tightly silica gel strip 8 on shell body 12 outer wall, and silica gel cover 82 passes through silica gel strip 8 and shell body 12 outer wall sealing connection.

Referring to fig. 1 and 3, the silicone jackets 82 are located between the heat dissipation fins 123 in a one-to-one correspondence.

Referring to fig. 3, a through hole 122 is formed in the inner wall of the pressurizing chamber 121 toward the water filling chamber 821, and the through hole 122 communicates the water filling chamber 821, the connection port 81 and the pressurizing chamber 121. The end of the outlet pipe 114 remote from the outlet channel 113 extends to a position close to the through opening 122.

Referring to fig. 3, the silica gel sleeve 82 has a certain toughness, after the water in the pressurizing cavity 121 enters the water filling cavity 821, the silica gel sleeve 82 bulges, the silica gel sleeve 82 abuts against the outer wall of the convex ring 6, and the side wall of the silica gel sleeve 82 abuts against the flow channel 61.

Referring to fig. 3 and 4, the silica gel cover 82 is provided with two guide slopes 822 on a side facing the flow passage 61.

Referring to fig. 1 and 4, two guide inclined surfaces 822 are positioned at both ends of the silicone cover 82 near the heat sink 123, and the guide inclined surfaces 822 extend in a direction away from the convex ring 6 in a direction toward the heat sink 123.

Referring to fig. 3 and 4, the connecting strip 7 is fixed on the clamping piece 83, and the connecting strip 7 is located on one side of the silica gel sleeve 82 away from the convex ring 6.

Referring to fig. 1 and 4, the clamping piece 83 and the silicone strip 8 are tightly attached to the outer wall of the heat sink 123 to form a curve, both ends of the connecting strip 7 are fixed to the clamping piece 83 on both sides of the silicone sleeve 82 of the heat sink 123 tightly attached thereto, and the water control plate 71 is fixed to the connecting strip 7.

Referring to fig. 3 and 4, the water control plate 71 abuts against the side wall of the silica gel sleeve 82 away from the flow channel 61. The water control plate 71 supports the silica gel sleeve 82, so that the silica gel sleeve 82 can better abut against the flow channel 61.

Referring to fig. 1 and 2, a drain ring 9 is fixed on a side wall of the shell 12, which is close to the rear end cover 13, the drain ring 9 extends along the circumferential direction of the shell 12, a drain channel 91 for water supply flow is arranged inside the drain ring 9, the drain channel 91 and the drain ring 9 are coaxially arranged, five water inlets 92 are formed in one side, which is far away from the rear end cover 13, of the drain ring 9, the water inlets 92 are communicated with the drain channel 91, the water inlets 92 are in one-to-one correspondence with gaps between adjacent cooling fins 123, and the flow channels 61 are in one-to-one correspondence with the water inlets 92.

Referring to fig. 1 and 2, the end of the drain ring 9 away from the water inlet 92 is connected with a water outlet connector 93, and when the base 3 is supported on the ground, the water outlet connector 93 is located at the bottom of the drain ring 9.

The implementation principle of the space negative pressure heat dissipation motor provided by the embodiment of the application is as follows: when the motor is used, the heat radiation fan rotates and then pumps out hot air in the shell 12, so that the cooling effect is achieved;

meanwhile, the water inlet joint 112 is connected with a water pipe and is used for introducing water at a faster water flow rate, water fills the clamping cavity 111 and then enters the pressurizing cavity 121 through the water outlet channel 113 and the water storage pipe, the silica gel sleeve 82 is filled with water with stronger water pressure, the silica gel sleeve 82 is swelled, meanwhile, water can be sprayed out from the flow channel 61, the swelled silica gel sleeve 82 is abutted at the flow channel 61, the water outlet speed at the flow channel 61 is slower, and because the silica gel sleeve 82 is abutted against the flow channel 61, water is easily sprayed between the adjacent cooling fins 123 from the guide inclined plane 822, the contact area between the cooling fins 123 and the water is increased, and therefore the heat dissipation effect of the cooling fins 123 is improved. After water enters the gaps between the cooling fins 123, the water enters the drain ring 9 from the water inlet 92 along the gaps, and is discharged from the water outlet joint 93 through the drain ring 9.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The utility model provides a space negative pressure heat dissipation motor, includes front end housing (11), shell body (12), rear end housing (13) and is located interior rotor structure (2) of shell body (12), be provided with radiator fan (4) in rear end housing (13), the air inlet one side of radiator fan (4) is towards stator rotor structure (2), be provided with air outlet (131) on rear end housing (13), air outlet one side of radiator fan (4) is towards air outlet (131), its characterized in that: a clamping cavity (111) is formed in the front end cover (11), a water inlet joint (112) for connecting a water pipe is arranged on the front end cover (11), the water inlet joint (112) is communicated with the clamping cavity (111), a plurality of water outlet channels (113) are formed in the side wall, facing the shell body (12), of the front end cover (11), a plurality of pressurizing cavities (121) are formed in the shell body (12), the pressurizing cavities (121) are arranged along the circumferential direction of the axis of the shell body (12), and the pressurizing cavities (121) are communicated with the water outlet channels (113) in a one-to-one correspondence manner;

the shell body (12) is provided with a convex ring (6) on the outer side wall close to the front end cover (11), a flow channel (61) is arranged on the convex ring (6), the flow channel (61) penetrates through the convex ring (6) along the direction away from the front end cover (11), the flow channel (61) is communicated with the pressurizing cavity (121), a plurality of radiating fins (123) are arranged on the shell body (12) at intervals, and the flow channels (61) are in one-to-one correspondence with gaps between the adjacent radiating fins (123).

2. A space negative pressure heat dissipation motor according to claim 1 and wherein: the novel water draining device is characterized in that a draining ring (9) is arranged on the outer side wall, far away from the front end cover (11), of the shell body (12), the draining ring (9) extends along the circumferential direction of the shell body (12), a draining channel (91) is arranged inside the draining ring (9), and the draining channel (91) is arranged along the circumferential direction of the axis of the draining ring (9); the water draining ring (9) is provided with a water inlet (92) towards the side wall of the convex ring (6), the water inlets (92) are in one-to-one correspondence with gaps between the radiating fins (123), the side wall of the water draining ring (9) is provided with a water outlet joint (93), and the water outlet joint (93) is located at one end, far away from the water inlet (92), of the water draining ring (9).

3. A space negative pressure heat dissipation motor according to claim 2, wherein: a plurality of through openings (122) are formed in the shell body (12), and the through openings (122) are communicated with the pressurizing cavity (121); a silica gel sleeve (82) is fixed on the shell body (12), a water filling cavity (821) is arranged in the silica gel sleeve (82), the water filling cavity (821) is communicated with the through hole (122), the silica gel sleeve (82) is connected with the outer wall of the shell body (12) in a sealing way, and the silica gel sleeve (82) is positioned between the adjacent radiating fins (123); after the silica gel sleeve (82) is filled with water, the outer wall of the silica gel sleeve (82) after the water is filled is abutted against the runner (61).

4. A space negative pressure heat dissipating motor according to claim 3, wherein: be provided with accuse water board (71) between two adjacent fin (123), accuse water board (71) are located one side that runner (61) was kept away from to silica gel cover (82), one side that shell (12) outer wall was kept away from to fin (123) is fixed with connecting strip (7), accuse water board (71) are fixed in on connecting strip (7), after silica gel cover (82) water, silica gel cover (82) one side butt runner (61), opposite side butt accuse water board (71).

5. A space negative pressure heat dissipating motor according to claim 4, wherein: still include silica gel strip (8), the interval is equipped with a plurality of connectors (81) on silica gel strip (8), fill water chamber (821) and connector (81) one-to-one intercommunication, silica gel cover (82) and silica gel strip (8) integrated into one piece, silica gel strip (8) are fixed in the outer wall of casing (12).

6. A space negative pressure heat dissipating motor according to claim 5, wherein: be provided with on silica gel strip (8) and press from both sides tight piece (83), set up breach (831) that supplies silica gel cover (82) to pass on pressing from both sides tight piece (83), set up the fixed orifices on pressing from both sides tight piece (83) and the silica gel strip (8), shell (12), press from both sides tight piece (83) and silica gel strip (8) through wearing to establish bolt or screw fixation in the fixed orifices, silica gel strip (8) are located between shell (12) outer wall and the tight piece (83).

7. A space negative pressure heat dissipation motor according to claim 1 and wherein: the water outlet channel (113) is internally connected with a water outlet pipe (114), the water outlet pipe (114) is inserted into the pressurizing cavity (121), and the end part of the water outlet pipe (114) is close to the through hole (122).

8. A space negative pressure heat dissipating motor according to claim 7, wherein: the water outlet pipe (114) is sleeved with a sealing ring (5), and the joint of the pressurizing cavity (121) and the water outlet pipe (114) is arranged in a sealing way.

9. A space negative pressure heat dissipating motor according to claim 3, wherein: the silica gel cover (82) is provided with two direction inclined planes (822) towards one side of runner (61), and two direction inclined planes (822) are located silica gel cover (82) along being close to the both ends of fin (123), along the direction that is close to fin (123), direction inclined planes (822) are along the direction that keeps away from bulge loop (6).