Intermediate liquid-passing feed pipe structure of double-push double-out type pusher centrifuge

Abstract

The application discloses a middle liquid-passing feeding pipe structure of a double-push double-out type push feeding centrifuge, relates to the technical field of push feeding centrifuges, and has the advantages that the feeding pipe can also transport washing liquid and the inside of a screen drum can be conveniently cleaned, and the technical scheme is as follows: a main pipe for passing suspension slurry and a secondary pipe for passing washing liquid are arranged in the main pipe, one end of the secondary pipe is extended out of the main pipe through an elbow pipe, the other end of the secondary pipe is closed and penetrates through the main pipe and a push feeding disc, and a plurality of washing holes are arranged on the outer wall of the push feeding disc.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pusher centrifuges, in particular to a middle liquid-passing feed pipe structure of a double-push double-discharge type pusher centrifuge. BACKGROUND

[0002] A centrifuge is a machine for separating components in a mixture of solid particles and liquid or liquid and liquid by centrifugal force. A pusher centrifuge is a continuous operation filter type centrifuge and is widely applied in the field of solid-liquid separation.

[0003] A piston bidirectional pusher centrifuge is disclosed in Chinese Patent No. CN202121781704.9, which comprises a piston rotating rod body performing horizontal linear motion and rotary motion, an inner sleeve arranged between the piston rotating rod body and a bearing seat body, the bearing seat body arranged in an outer shell body, a rotating drum arranged on the side of the bearing seat body, a screen arranged in the rotating drum, a pusher arranged in the screen, a through hole arranged on the pusher close to the screen, the outer wall of the pusher in contact with the inner surface of the screen, the pusher performing repeated linear motion in the screen, the pusher connected to the side of the piston rotating rod body through a connecting piece, and a distribution hopper arranged on the side of the pusher away from the piston rotating rod body, wherein the distribution hopper is provided with a feed pipe.

[0004] The above-mentioned feed pipe only transports the suspension slurry and cannot transport the washing liquid for cleaning the screen cylinder.

[0005] Therefore, the applicant has developed a new technical solution in the actual production process to solve the above technical problems. SUMMARY

[0006] In view of the above technical deficiencies, the purpose of the present application is to provide a middle liquid-passing feed pipe structure of a double-push double-discharge type pusher centrifuge, which has the advantages of enabling the feed pipe to transport the washing liquid and facilitating the cleaning of the inside of the screen cylinder.

[0007] To solve the above technical problems, the application adopts the following technical solutions:

[0008] The application provides a middle liquid-passing feed pipe structure of a double-push double-discharge type pusher centrifuge, which comprises a main pipe for passing the suspension slurry and a secondary pipe located in the main pipe and used for passing the washing liquid, one end of the secondary pipe extends out of the main pipe through an elbow pipe, the other end of the secondary pipe is closed and penetrates the main pipe and the pusher disc, and a plurality of washing holes are formed in the outer wall of the pusher disc penetrated by the secondary pipe.

[0009] By adopting the technical scheme, the primary pipeline transports the suspension slurry into the centrifuge, the secondary pipeline transports the washing liquid into the centrifuge, the screen cylinder inside the pushing plate is cleaned through the washing holes, one side of the elbow and the primary pipeline is located outside the centrifuge wall, and the washing liquid and the suspension slurry are sequentially and conveniently introduced, so that the feeding pipe can also transport the washing liquid, and the screen cylinder inside is conveniently cleaned.

[0010] Preferably, the secondary pipeline is provided with an inverted cone disc on the outer wall penetrating out of the primary pipeline, one end of the inverted cone disc with a large taper is distributed towards the pushing plate, and the secondary pipeline is coaxially distributed with the primary pipeline.

[0011] Preferably, the secondary pipeline is provided with an adjusting member for alternately spraying the washing liquid sprayed from part of the washing holes on the pushing plate and the pushing base plate.

[0012] Preferably, the adjusting member comprises a moving pipe which is slidably connected to the outer wall of the secondary pipeline and has a semicircular longitudinal section, a plurality of eight-shaped flow guide holes are formed in the moving pipe, one flow guide hole in each pair of flow guide holes is distributed towards the pushing base plate, the other flow guide hole is distributed towards the pushing plate, each pair of flow guide holes is alternately communicated with one washing hole, and the secondary pipeline is provided with a pushing member for horizontally reciprocating the moving pipe.

[0013] Preferably, the pushing member comprises a vertical column which is arranged on the outer wall of the secondary pipeline penetrating out of the pushing plate and is distributed perpendicular to the length direction of the secondary pipeline, a sliding groove is formed in the moving pipe for the vertical column to slide into, the sliding groove is distributed along the length direction of the secondary pipeline, a connecting rod is arranged on the outer wall of the moving pipe, one end of the connecting rod away from the moving pipe is provided with a horizontal rod between the pushing plate and the pushing base plate, the horizontal rod is provided with two rolling balls respectively sliding on the pushing plate and the pushing base plate, and annular driving grooves are formed in the pushing plate and the pushing base plate for the rolling balls to slide.

[0014] Preferably, when the pushing base plate drives the pushing plate and the horizontal rod to move towards the bottom of the screen cylinder, the flow guide hole in each pair of flow guide holes distributed towards the pushing plate is communicated with the washing hole; when the pushing base plate drives the pushing plate and the horizontal rod to move away from the bottom of the screen cylinder, the flow guide hole in each pair of flow guide holes distributed towards the surface of the pushing base plate is communicated with the washing hole.

[0015] Preferably, one end of the primary pipeline is communicated with a suspension slurry pipe through a feeding flange, the elbow is provided with a washing flange penetrating out of the primary pipeline away from the secondary pipeline, and the elbow is communicated with a washing liquid pipe through the washing flange.

[0016] Preferably, the installation method of the elbow and the secondary pipeline and the primary pipeline is as follows:

[0017] First step: one end of the elbow is welded on one side of the secondary pipeline;

[0018] Second step: the main pipeline is provided with a communication hole which is communicated with the bend pipe away from the secondary pipeline, and then the secondary pipeline and the bend pipe are inserted into the main pipeline, so that one end of the bend pipe is communicated with the communication hole, and at this time the bend pipe is welded on the hole wall of the communication hole outside the main pipeline;

[0019] Third step: a straight cylinder pipe is welded on the outer wall of the main pipeline, so that the straight cylinder pipe is communicated with the bend pipe, and at this time the washing flange is welded on the straight cylinder pipe.

[0020] Preferably, the outer wall of the secondary pipeline is circumferentially and uniformly provided with two or more equal-height reinforcing ribs, and when the secondary pipeline is inserted into the main pipeline, one end of each of the reinforcing ribs away from the secondary pipeline is in contact with the inner wall of the main pipeline.

[0021] Preferably, after the secondary pipeline is inserted into the main pipeline in the second step, the secondary pipeline is coaxial with the main pipeline through the equal-height reinforcing ribs, and the inner wall of the main pipeline is provided with a stopper located at one side of the equal-height reinforcing ribs, and when one side of the equal-height reinforcing ribs is in contact with the stopper, one end of the bend pipe is communicated with the communication hole.

[0022] The present application has the advantages that the main pipeline transports the suspension slurry into the centrifuge, the secondary pipeline transports the washing liquid into the centrifuge, the screen cylinder inside the pusher plate is cleaned through the washing hole, one side of the bend pipe and the main pipeline are located outside the wall of the centrifuge, and the washing liquid and the suspension slurry are sequentially and conveniently introduced, so that the feeding pipe can also transport the washing liquid, and the inside of the screen cylinder is conveniently cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] Figure 1 It is a structural schematic view of the embodiment;

[0025] Figure 2 It is a structural schematic view of the embodiment for embodying the feeding pipe in the centrifuge;

[0026] Figure 3 It is a structural schematic view of the embodiment for embodying the moving pipe;

[0027] Figure 4 It is Figure 3 It is an enlarged structural schematic view of part A;

[0028] Figure 5 It is a structural schematic view of the embodiment for embodying the vertical column;

[0029] Figure 6 Structure diagram of the embodiment for embodying the equal-height reinforcing rib;

[0030] Figure 7 For Figure 6 Structure diagram of the enlarged middle B part.

[0031] Explanation of the reference signs:

[0032] In the figure: 1, main pipeline; 11, secondary pipeline; 111, inverted cone disc; 112, moving pipe; 113, flow guide hole; 114, pushing bottom disc; 115, equal-height reinforcing rib; 116, support column; 12, elbow pipe; 13, pushing disc; 14, washing hole; 15, vertical column; 151, sliding groove; 16, connecting rod; 161, horizontal rod; 162, ball; 163, driving groove; 17, feeding flange; 18, washing flange; 19, communication hole; 191, straight cylinder pipe; 192, stop block; 2, screen drum; 3, rotary drum. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] A middle liquid-feeding pipe structure of a double-pushing and double-out type pushing centrifuge, as shown in Figure 1 and Figure 2 , comprises a main pipeline 1 for feeding the suspension slurry and a secondary pipeline 11 located in the main pipeline 1 and used for feeding the washing liquid, the main pipeline 1 extends into the screen drum 2 at one end and extends out of the centrifuge at the other end, the secondary pipeline 11 extends out of the main pipeline 1 at one end through the elbow pipe 12 and is closed at the other end and extends out of the pushing disc 13, and a plurality of washing holes 14 are formed in the outer wall of the pushing disc 13, at this time, the elbow pipe 12 can be a 90° elbow pipe 12.

[0035] As shown in Figure 1 and Figure 2 , the main pipeline 1 is used for feeding the suspension slurry into the centrifuge, and the secondary pipeline 11 is used for feeding the washing liquid into the centrifuge, the screen drum 2 inside the pushing disc 13 is cleaned through the washing holes 14, and the elbow pipe 12 and one side of the main pipeline 1 are located on the outer wall of the centrifuge, which facilitates the feeding of the washing liquid and the suspension slurry, respectively, at this time, the feeding pipe can also be used for feeding the washing liquid, which facilitates the cleaning of the inside of the screen drum 2. A plurality of spray holes can also be formed in the closed end of the secondary pipeline 11 according to requirements.

[0036] As shown in Figure 1 andFigure 2 The secondary pipeline 11 is provided with an inverted cone disc 111 on the outer wall of the main pipeline 1, and the larger end of the inverted cone disc 111 is distributed towards the pushing disc 13. The secondary pipeline 11 is coaxially distributed with the main pipeline 1. At this time, the inverted cone disc 111 can make the slurry of the suspension liquid from the feed pipe hit the inverted cone disc 111, and then enter the distributor for acceleration and distribution. This reduces the uneven distribution of the material, which can easily cause the centrifuge to vibrate. At this time, the inverted cone disc 111, the secondary pipeline 11 and the central axis of the main pipeline 1 are coaxially distributed.

[0037] As Figure 1 and Figure 2 In application, the parts around the main pipeline 1 are arranged as follows: the main pipeline 1 is installed in a feed pipe seat, the secondary pipeline 11 passes through a pushing disc 13, the pushing disc 13 is respectively provided with a main distributor and an auxiliary distributor on both sides (for details, please refer to the patent content of the application for a double-pushing double-out type solid-liquid separation structure for a pushing centrifuge and a centrifuge with the application number 2025102540479), an outer side of the pushing disc 13 is a rotary drum 3, the rotary drum 3 is provided with a screen drum 2, a pushing bottom disc 114 rotates and reciprocates, and the pushing bottom disc 114 is located in the rotary drum 3; the pushing bottom disc 114 is provided with eight supporting columns 116, and the pushing disc 13 is installed on the supporting columns 116. After the centrifuge is worked, the pushing disc 13 and the pushing bottom disc 114 will be left with materials.

[0038] As Figure 3 and Figure 4 and Figure 5 Therefore, in order to clean the materials on the pushing disc 13 and the pushing bottom disc 114, the secondary pipeline 11 is provided with an adjusting part for alternately spraying the washing liquid sprayed from part of the washing holes 14 on the secondary pipeline 11 on the pushing disc 13 and the pushing bottom disc 114.

[0039] As Figure 3 and Figure 4 and Figure 5, the adjusting member comprises a moving pipe 112 which is connected to the outer wall of the secondary pipeline 11 in a sliding manner and has a semicircular longitudinal section, the moving pipe 112 is distributed along the arc of the outer wall of the secondary pipeline 11 and is distributed on the upper semicircle of the secondary pipeline 11, a plurality of pairs of eight-shaped flow guide holes 113 are formed in the moving pipe 112, the outlet of one flow guide hole 113 in each pair of flow guide holes 113 faces the pushing base plate 114, the outlet of the other flow guide hole 113 in each pair of flow guide holes 113 faces the pushing plate 13, and each pair of flow guide holes 113 is alternately communicated with one washing hole 14, and the pushing member is arranged on the secondary pipeline 11 and is used for pushing the moving pipe 112 to move horizontally and reciprocally. At this time, the pushing member pushes the moving pipe 112 to move reciprocally, so that the flow guide holes 113 guide the washing liquid in the washing hole 14 to the pushing plate 13 or the pushing base plate 114, the density of the washing holes 14 located outside the moving pipe 112 is greater than the density of the washing holes 14 located inside the moving pipe 112, and the washing holes 14 located outside the moving pipe 112 are convenient for spraying the washing liquid into the screen drum 2 to wash the screen drum 2.

[0040] As Figure 3 and Figure 4 and Figure 5 , the pushing member comprises a vertical column 15 which is arranged on the outer wall of the secondary pipeline 11 penetrating the pushing plate 13 and is distributed vertically to the length direction of the secondary pipeline 11, a sliding groove 151 is formed in the moving pipe 112 and is used for sliding the vertical column 15, at this time, the vertical column 15 and the secondary pipeline 11 are stationary, the sliding groove 151 is distributed along the length direction of the secondary pipeline 11, a connecting rod 16 is arranged on the outer wall of the moving pipe 112, the connecting rod 16 is distributed in a staggered manner with the vertical column 15, one end of the connecting rod 16 away from the moving pipe 112 is provided with a horizontal rod 161 located between the pushing plate 13 and the pushing base plate 114, both ends of the horizontal rod 161 are respectively provided with a rolling ball 162 which slides on the pushing plate 13 and the pushing base plate 114, and annular driving grooves 163 are formed in the pushing plate 13 and the pushing base plate 114 and are used for sliding the rolling ball 162. When the pushing base plate 114 and the pushing plate 13 move horizontally and reciprocally, the horizontal rod 161 is also driven to move horizontally and reciprocally, at this time, the horizontal rod 161 drives the moving pipe 112 to move horizontally and reciprocally on the secondary pipeline 11 through the connecting rod 16, so as to facilitate the flow guide holes 113 on the moving pipe 112 to communicate with the washing holes 14 and change the spraying direction of the washing liquid, at this time, the driving grooves 163 are arranged to facilitate the rolling ball 162 to slide in the driving grooves 163 when the pushing base plate 114 and the pushing plate 13 rotate together, and the moving pipe 112 does not rotate together with the pushing base plate 114 and the pushing plate 13 under the limiting of the vertical column 15.

[0041] As Figure 3 and Figure 4 and Figure 5When the pushing base 114 drives the pushing disc 13 and the cross bar 161 to move towards the bottom of the screen cylinder 2, the guide holes 113 of each pair of guide holes 113, whose outlets are distributed towards the pushing disc 13, are communicated with the washing holes 14, and at this time, the pushing disc 13 moves towards the moving tube 112; when the pushing base 114 drives the pushing disc 13 and the cross bar 161 to move away from the bottom of the screen cylinder 2, the guide holes 113 of each pair of guide holes 113, whose outlets are distributed towards the pushing base 114, are communicated with the washing holes 14, and at this time, the pushing base 114 moves towards the moving tube 112, thereby facilitating the washing liquid to clean the pushing base 114.

[0042] As Figure 3 and Figure 4 and Figure 5 One end of the main pipeline 1 is communicated with the suspension slurry pipeline through the feeding flange 17, and the washing flange 18 is arranged on the bending tube 12 after the bending tube 12 is drawn out of the main pipeline 1 away from the secondary pipeline 11, and the bending tube 12 is communicated with the washing liquid pipeline through the washing flange 18, and at this time, the suspension slurry pipeline and the washing liquid pipeline are both provided with the pump for respectively pouring the suspension slurry and the washing liquid into the main pipeline 1 and the bending tube 12.

[0043] As Figure 6 and Figure 7 The installation method of the bending tube 12 and the secondary pipeline 11 and the main pipeline 1 is as follows:

[0044] First step: one end of the bending tube 12 is welded on one side of the secondary pipeline 11;

[0045] Second step: the communication hole 19, which is communicated with the bending tube 12 drawn out of the secondary pipeline 11, is arranged on the main pipeline 1, and then the secondary pipeline 11 and the bending tube 12 are inserted into the main pipeline 1 together, so that one end of the bending tube 12 is communicated with the communication hole 19, and at this time, the bending tube 12 is welded on the hole wall of the communication hole 19 outside the main pipeline 1, and the welding seam is as shown in Figure 7 ;

[0046] Third step: the straight cylinder tube 191 is welded on the outer wall of the main pipeline 1, so that the straight cylinder tube 191 is communicated with the bending tube 12, and at this time, the washing flange 18 is welded on the straight cylinder tube 191, and the welding seam is as shown in Figure 7 , and at this time, the secondary pipeline 11 and the bending tube 12 are installed into the main pipeline 1.

[0047] As Figure 6 and Figure 7The outer wall of the secondary pipeline 11 is circumferentially provided with two or more equal-height reinforcing ribs 115. The height of each reinforcing rib is the same. When the secondary pipeline 11 is inserted into the main pipeline 1, the end of each reinforcing rib away from the secondary pipeline 11 is in contact with the inner wall of the main pipeline 1. After the secondary pipeline 11 is inserted into the main pipeline 1 in the second step, the equal-height reinforcing ribs 115 make the secondary pipeline 11 coaxial with the main pipeline 1. The inner wall of the main pipeline 1 is provided with a stopper 192 on the side of the equal-height reinforcing ribs 115. When the side of the equal-height reinforcing ribs 115 is in contact with the stopper 192, one end of the elbow 12 is in communication with the communication hole 19. At this time, the equal-height reinforcing ribs 115 make the secondary pipeline 11 coaxial with the main pipeline 1, which facilitates the guarantee of the coaxiality of the secondary pipeline 11 and the main pipeline 1 when the elbow 12 is welded on the hole wall of the communication hole 19. The equal-height reinforcing ribs 115 play a positioning role. The stopper 192 limits the length of the extension of the secondary pipeline 11, which facilitates the alignment of the elbow 12 and the communication hole 19.

[0048] Obviously, various modifications and changes can be made to the present application without departing from the spirit and scope of the application. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as expressed in the following claims and their equivalents.

Claims

1. A structure of a middle liquid-feeding pipe of a double-push double-discharge type pusher centrifuge, characterized in that, The main pipeline (1) for passing the suspension slurry and the secondary pipeline (11) for passing the washing liquid are arranged in the main pipeline (1), the secondary pipeline (11) extends out of the main pipeline (1) through the bend (12) at one end, is closed at the other end and penetrates the main pipeline (1) and the pushing disc (13), and a plurality of washing holes (14) are arranged on the outer wall of the pushing disc (13); The adjusting member is arranged on the secondary pipeline (11) and makes the washing liquid sprayed from the part of the washing holes (14) on the secondary pipeline (11) spray on the pushing disc (13) and the pushing base disc (114) alternately; The adjusting member comprises the moving pipe (112) which is connected to the outer wall of the secondary pipeline (11) in a sliding mode and has a semicircular longitudinal section, a plurality of pairs of eight-shaped flow guide holes (113) are arranged on the moving pipe (112), one flow guide hole (113) in each pair of flow guide holes (113) has an outlet facing the pushing base disc (114), the other flow guide hole (113) has an outlet facing the pushing disc (13) and is distributed, and each pair of flow guide holes (113) is in communication with one washing hole (14) alternately, and the pushing member is arranged on the secondary pipeline (11) and pushes the moving pipe (112) to move horizontally and reciprocally; The pushing member comprises the vertical column (15) which is arranged on the outer wall of the secondary pipeline (11) penetrating the pushing disc (13) and is distributed perpendicularly to the length direction of the secondary pipeline (11), the sliding groove (151) is arranged on the moving pipe (112) and is slid into the vertical column (15), the sliding groove (151) is distributed along the length direction of the secondary pipeline (11), the connecting rod (16) is arranged on the outer wall of the moving pipe (112), one end of the connecting rod (16) away from the moving pipe (112) is provided with the horizontal rod (161) between the pushing disc (13) and the pushing base disc (114), both ends of the horizontal rod (161) are provided with the rolling ball (162) which slides on the pushing disc (13) and the pushing base disc (114), and the annular driving groove (163) is arranged on the pushing disc (13) and the pushing base disc (114) and is slid by the rolling ball (162).

2. A liquid feed pipe structure of a double-push double-discharge type pusher centrifuge according to claim 1, wherein The secondary pipeline (11) is provided with the inverted cone disc (111) on the outer wall penetrating the main pipeline (1), the inverted cone disc (111) is distributed with a larger taper at one end facing the pushing disc (13), and the secondary pipeline (11) is coaxially arranged with the main pipeline (1).

3. A double-push double-discharge pusher centrifuge intermediate liquid- passageway feed tube structure according to claim 1, characterized in that, When the pushing base disc (114) drives the pushing disc (13) and the horizontal rod (161) to move together towards the bottom of the screen cylinder (2), the flow guide hole (113) in each pair of flow guide holes (113) and having an outlet facing the pushing disc (13) is in communication with the washing hole (14); when the pushing base disc (114) drives the pushing disc (13) and the horizontal rod (161) to move away from the bottom of the screen cylinder (2), the flow guide hole (113) in each pair of flow guide holes (113) and having an outlet facing the pushing base disc (114) is in communication with the washing hole (14).

4. A double-push double-discharge pusher centrifuge intermediate liquid- passageway feed tube structure according to claim 2, characterized in that, One end of the main pipeline (1) is communicated with the suspension slurry pipeline through the feeding flange (17), and the elbow pipe (12) is provided with a washing flange (18) after penetrating out of the main pipeline (1) away from the secondary pipeline (11), and the elbow pipe (12) is communicated with the washing liquid pipeline through the washing flange (18).

5. A double-push double-discharge pusher centrifuge intermediate liquid- pass pipe structure according to claim 4, characterized in that, The installation method of the elbow pipe (12), the secondary pipeline (11) and the main pipeline (1) is as follows: First step: one end of the elbow pipe (12) is welded on one side of the secondary pipeline (11); Second step: the main pipeline (1) is provided with a communication hole (19) communicated with the elbow pipe (12) away from the secondary pipeline (11), and then the secondary pipeline (11) and the elbow pipe (12) are inserted into the main pipeline (1) together, so that one end of the elbow pipe (12) is communicated with the communication hole (19), and the elbow pipe (12) is welded on the hole wall of the communication hole (19) outside the main pipeline (1) at this time; Third step: a straight cylinder pipe (191) is welded on the outer wall of the main pipeline (1), so that the straight cylinder pipe (191) is communicated with the elbow pipe (12), and the washing flange (18) is welded on the straight cylinder pipe (191) at this time.

6. A liquid feed pipe structure for a double-push double-eject type pusher centrifuge according to claim 5, wherein The outer wall of the secondary pipeline (11) is circumferentially and uniformly provided with two or more than two equal-height reinforcing ribs (115), and when the secondary pipeline (11) enters the main pipeline (1), one end of each of the reinforcing ribs away from the secondary pipeline (11) is in contact with the inner wall of the main pipeline (1).

7. A double-push double-discharge pusher centrifuge intermediate liquid- passageway feed tube structure according to claim 6, characterized in that, After the secondary pipeline (11) is placed in the main pipeline (1) in the second step, the secondary pipeline (11) is coaxial with the main pipeline (1) through the equal-height reinforcing ribs (115), and the inner wall of the main pipeline (1) is provided with a stop block (192) located on one side of the equal-height reinforcing ribs (115), when one side of the equal-height reinforcing ribs (115) is in contact with the stop block (192), one end of the elbow pipe (12) is communicated with the communication hole (19).

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