Pressurizing, flushing and blowdown system for kitchen
By designing a kitchen pressurized flushing and drainage system including main drainage pipe, sub drainage pipe, one-way valve, transition pipe, cleaning components and flushing pipe, the problem of oily sewage in the kitchen is solved, and the complete cleaning and drainage of oil in the pipeline is achieved.
Patent Information
- Application Number
- CN202421789613.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The long-term discharge of oily sewage produced in the kitchen leads to blockage of sewage pipes, causing problems such as reflux, insects, poor drainage, odor and moldy and deformation of the cabinet.
Design a pressurized flushing and sewage discharge system for kitchens, including the main drainage pipe, the secondary drainage pipe, the one-way valve, the transition pipe, the cleaning assembly and the flushing pipe, which flows into the drainage pipe through the mixing of hot water and the cleaning agent, and the cleaning agent is stored in the cleaning assembly. The one-way valve ensures the one-way flow of hot water, and the spiral flow channel increases the flow rate of sewage.
Effectively clean the oil and dirt in the pipeline, avoid blockage of sewer pipes, prevent backwater, insects, poor drainage, odor, moldy and deformation of the cabinet, and ensure smooth drainage.
Smart Images

Figure CN222796607U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of kitchen drainage, in particular to a pressurized flushing and drainage system for a kitchen. Background Art
[0002] Kitchens will produce a lot of kitchen wastewater, which contains a lot of oil. At present, the oily wastewater produced by household kitchens and catering kitchens is mostly discharged directly into the sewer pipe.
[0003] Since oil becomes sticky and adherent after cooling, long-term discharge will cause the sewer pipe to become thinner. At this time, foreign matter such as domestic garbage and oil contained in the sewage will remain in the sewer pipe. If it exists for a long time, there will be odor, insects, poor drainage, overflow, etc. The overflow will also cause the cabinet to mold and deform. In high-rise residential buildings, blockage in the sewer pipes on the upper floors will backflow into the homes of residents on the lower floors, causing trouble for the owners, affecting their normal life experience, and also causing some economic losses (such as additional economic investment such as hiring professionals for maintenance). Utility Model Content
[0004] The utility model aims to provide a pressurized flushing and drainage system for the kitchen, which makes it more convenient and thorough to clean the oil stains in the pipes, avoids backflow, insects, poor drainage, odor caused by blockage of the sewer pipes, and cabinet mold and deformation caused by backflow.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the utility model provides a pressurized flushing and drainage system for a kitchen, which comprises:
[0006] A main drain pipe connected to the bottom of the cleaning tank;
[0007] A secondary drain pipe, which is connected to the bottom of the main drain pipe and is arranged obliquely;
[0008] A one-way valve connected to a hot water pipe;
[0009] A transition pipe connected to a side of the one-way valve away from the hot water pipe;
[0010] A cleaning component, wherein the cleaning component is connected to the transition pipe and a cleaning agent is stored in the cleaning component;
[0011] A flushing pipe is connected to the transition pipe and the main drainage pipe and is arranged obliquely.
[0012] Optimally, the inner side walls of the main drain pipe and the auxiliary drain pipe are provided with spiral flow channels.
[0013] Optimally, the one-way valve includes a valve body connecting an inlet pipe and a transition pipe, a liquid inlet groove and a liquid outlet groove opened in the valve body, a transition groove connecting the liquid inlet groove and the liquid outlet groove, and a blocking unit arranged in the liquid outlet groove, and the liquid in the liquid inlet groove flows unidirectionally to the liquid outlet groove through the blocking unit.
[0014] Optimally, the blocking unit includes a push pin elastically arranged in the liquid outlet groove, a liquid flow groove opened in the push pin, a liquid through hole arranged in a ring on the outside of the push pin, an abutment integrally connected to the side of the push pin close to the liquid inlet groove, an inner abutment obliquely arranged on the outside of the abutment, and an outer abutment connecting the liquid inlet groove and the transition groove and obliquely arranged, the liquid in the transition groove flows into the liquid flow groove through the liquid through hole, and the diameter of the push pin is equal to the inner diameter of the liquid outlet groove.
[0015] Optimally, the blocking unit further comprises a baffle fixed in the liquid outlet groove, a through hole penetrating the baffle, and a return spring arranged in the liquid flow groove, wherein the return spring abuts between the abutment head and the baffle.
[0016] Optimally, the liquid inlet groove includes a first liquid inlet groove and a second liquid inlet groove opened in the valve body, a first liquid inlet portion obliquely arranged on one side of the first liquid inlet groove and gradually expanding in diameter, and a second liquid inlet portion connecting the first liquid inlet groove and the second liquid inlet groove, and the diameter of the first liquid inlet groove is larger than the diameter of the second liquid inlet groove.
[0017] Optimally, the one-way valve further comprises a liquid outlet portion which is obliquely arranged on one side of the liquid outlet groove and has a gradually expanding diameter, a sealing groove provided on both sides of the valve body, and a sealing ring arranged in the sealing groove.
[0018] Optimally, the cleaning assembly includes a fixed plate, a liquid storage tank rotatably arranged on the top of the fixed plate, a first through groove penetrating the liquid storage tank, a second through groove penetrating the fixed plate, a liquid drainage tank fixed at the bottom of the fixed plate, and a liquid drainage pipe integrally connected to the bottom of the liquid drainage tank, the liquid drainage pipe is connected to the transition pipe, and the rotation of the liquid storage tank will adjust the overlapping area of the first through groove and the second through groove.
[0019] Optimally, the cleaning assembly further comprises a limiting column fixed on the top of the fixing plate and penetrating the liquid storage bin, and a top plate fixed on the top of the limiting column, wherein the diameter of the top plate is greater than the diameter of the limiting column.
[0020] Optimally, it also includes a water inlet pipe connecting the hot water pipe and the one-way valve, a switch valve arranged on the water inlet pipe, and a water pipe joint connecting the transition pipe and the flushing pipe.
[0021] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:
[0022] When the utility model kitchen pressurized flushing and drainage system is used, the switch valve is first opened, and the hot water in the hot water pipe flows into the transition pipe in one direction through the water inlet pipe and the one-way valve, and the cleaning component injects a cleaning agent into the transition pipe, and the cleaning agent mixes with the hot water and flows to the main drainage pipe and the auxiliary drainage pipe at the same time, thereby completing the cleaning of the drainage pipe, and the oil and dirt in the pipe are cleaned more conveniently and thoroughly, avoiding backflow, insects, poor drainage, odor caused by blockage of the sewer pipe, and mold and deformation of the cabinet caused by backflow.
[0023] Furthermore, spiral flow channels are provided in the main drainage pipe and the auxiliary drainage pipe, which increases the flow rate of sewage and makes it easier to discharge foreign matter in the pipe;
[0024] Furthermore, the setting of the one-way valve ensures the one-way flow of hot water, preventing the sewage and exhaust gas in the drainage pipe from flowing back, thereby affecting the water quality in the hot water pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:
[0026] Figure 1 This is the main view of the utility model
[0027] Figure 2 It is a cross-sectional view of the one-way valve of the utility model;
[0028] Figure 3 It is a cross-sectional view of the cleaning component of the utility model;
[0029] Figure 4 It is a partial structural schematic diagram of the cleaning component of the utility model;
[0030] The reference numerals are described as follows:
[0031] 1. Countertop;
[0032] 2. Cleaning pool;
[0033] 3. Hot water pipe;
[0034] 4. Water inlet pipe;
[0035] 5. Switch valve;
[0036] 6. One-way valve; 601. Valve body; 602. Sealing groove; 603. Sealing ring; 604. First liquid inlet; 605. First liquid inlet groove; 606. Second liquid inlet; 607. Second liquid inlet groove; 608. External abutment; 609. Transition groove; 610. Liquid outlet groove; 611. Liquid outlet; 612. Push column; 613. Abutment; 614. Internal abutment; 615. Liquid flow groove; 616. Liquid passage hole; 617. Return spring; 618. Baffle; 619. Through hole;
[0037] 7. Transition pipe;
[0038] 8. Cleaning assembly; 801. Fixing plate; 802. Liquid storage bin; 803. Liquid storage tank; 804. Limiting column; 805. Top plate; 806. First through slot; 807. Second through slot; 808. Liquid drainage bin; 809. Liquid drainage pipe;
[0039] 9. Water pipe joint;
[0040] 10. Main drain pipe;
[0041] 11. Auxiliary drainage pipe;
[0042] 12. Flush the pipe. DETAILED DESCRIPTION
[0043] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0046] like Figure 1As shown, it is a front view of the pressurized flushing and drainage system for the kitchen of the utility model, which includes a countertop 1, a cleaning pool 2, a hot water pipe 3, a water inlet pipe 4, a switch valve 5, a one-way valve 6, a transition pipe 7, a cleaning assembly 8, a water pipe joint 9, a main drain pipe 10, a secondary drain pipe 11 and a flushing pipe 12. The countertop 1 is usually a marble slab, which is pasted on the surface of the kitchen counter by cement mortar. The cleaning pool 2 is embedded at the bottom of the countertop 1, and is used for indoor personnel to wash vegetables or dump leftovers and soup. The hot water pipe 3 is arranged above the countertop 1 and is connected to the water heater.
[0047] The main drain pipe 10 is vertically connected to the bottom of the cleaning pool 2, and the auxiliary drain pipe 11 is integrally connected to the bottom of the main drain pipe 10 and is arranged to be tilted downward. The oily dirt and leftover soup washed in the cleaning pool 2 pass through the main drain pipe 10 and then are discharged to the sewer through the auxiliary drain pipe 11. By setting the inclined auxiliary drain pipe 11, the discharge efficiency of domestic sewage is improved and the sewage backflow is avoided.
[0048] The inner walls of the main drainage pipe 10 and the auxiliary drainage pipe 11 are provided with spiral flow channels, which can make the gas or liquid in the pipe move along the spiral angle to achieve the effect of drainage and exhaust, increase the flow rate of sewage, and facilitate the discharge of domestic sewage.
[0049] The water inlet pipe 4 is connected to the hot water pipe 3, and a switch valve 5 is arranged on the water inlet pipe 4. When the drain pipe needs to be cleaned, the switch valve 5 is opened, and the hot water in the hot water pipe 3 flows to the water inlet pipe 4; after the cleaning is completed, the switch valve 5 is closed in time.
[0050] The one-way valve 6 is connected to the end of the water inlet pipe 4 away from the hot water pipe 3. By setting the one-way valve 6, the one-way flow of hot water is ensured to prevent the sewage and exhaust gas in the drain pipe from flowing back, thereby affecting the water quality in the hot water pipe 3. Figure 2 As shown, the one-way valve 6 comprises a valve body 601, a sealing groove 602, a sealing ring 603, a liquid inlet groove, a transition groove 609, a liquid outlet groove 610, a liquid outlet 611 and a blocking unit. Both ends of the valve body 601 are connected between the water inlet pipe 4 and the transition pipe 7 by raw tape.
[0051] The sealing grooves 602 are provided on both sides of the valve body 601 , and the sealing rings 603 are arranged in the sealing grooves 602 , so as to improve the sealing performance of the connection between the valve body 601 and the water inlet pipe 4 and the transition pipe 7 , and avoid the leakage of hot water and sewage.
[0052] The liquid inlet tank is provided on one side of the valve body 601 close to the water inlet pipe 4, the liquid outlet tank 610 is provided on one side of the valve body 601 close to the transition pipe 7, and the transition tank 609 is provided in the valve body 601 and connects the liquid inlet tank and the liquid outlet tank 610. The plugging unit is provided in the liquid outlet tank 610, and is used to unidirectionally plug the liquid outlet tank 610 and the transition tank 609. When cleaning the drain pipe, the switch valve 5 is opened, and the hot water in the hot water pipe 3 flows into the liquid inlet tank through the water inlet pipe 4, and then flows into the liquid outlet tank 610 unidirectionally through the transition tank 609, and finally flows into the transition pipe 7. By providing the plugging unit, the unidirectional flow of hot water can be ensured, and the sewage and exhaust gas in the drain pipe can be prevented from flowing back, thereby affecting the water quality in the hot water pipe 3.
[0053] The liquid inlet groove includes a first liquid inlet portion 604, a first liquid inlet groove 605, a second liquid inlet portion 606 and a second liquid inlet groove 607. The first liquid inlet groove 605 and the second liquid inlet groove 607 are horizontally opened in the valve body 601, and the diameter of the first liquid inlet groove 605 is larger than the diameter of the second liquid inlet groove 607. The first liquid inlet portion 604 is obliquely arranged on a side of the first liquid inlet groove 605 away from the second liquid inlet groove 607, and the second liquid inlet portion 606 is connected between the first liquid inlet groove 605 and the second liquid inlet groove 607 and is obliquely arranged.
[0054] exist Figure 2 In the perspective shown, from left to right, the diameter of the first liquid inlet portion 604 and the diameter of the second liquid inlet portion 606 gradually decrease, thereby gradually reducing the impact vibration of hot water on the blocking unit and increasing the service life of the one-way valve 6.
[0055] The blocking unit includes an outer abutment 608, a push post 612, a stopper 613, an inner abutment 614, a liquid flow groove 615, a liquid through hole 616, a return spring 617, a baffle 618 and a through hole 619. The push post 612 is disposed in the liquid outlet groove 610, and the diameter of the push post 612 is equal to the inner diameter of the liquid outlet groove 610. When the push post 612 moves in the liquid outlet groove 610, it is guided by the liquid outlet groove 610 to prevent the push post 612 from shaking when moving.
[0056] The push post 612 is connected to a side of the liquid inlet tank with a butt 613, and the outer peripheral surface of the butt 613 is provided with an inclined inner butt portion 614, and the outer butt portion 608 is used to connect the second liquid inlet tank 607 and the transition tank 609 and is inclined. When the drain pipe is cleaned, the push post 612 is reset under the action of the reset spring 617, and the inner butt portion 614 and the outer butt portion 608 are abutted and fit, thereby completing the blocking work of the liquid inlet tank and the transition tank 609, and preventing the sewage and exhaust gas in the drain pipe from flowing back.
[0057] The liquid flow groove 615 is opened in the push column 612, and the liquid hole 616 is arranged on the side of the push column 612 close to the head 613. The liquid in the liquid inlet groove flows to the liquid flow groove 615 through the transition groove 609 and the liquid hole 616, and finally flows into the transition pipe 7 through the liquid outlet groove 610.
[0058] The baffle 618 is fixed in the liquid outlet groove 610, the through hole 619 horizontally penetrates the baffle 618, the return spring 617 is arranged in the liquid flow groove 615, and the two sides of the return spring 617 are respectively abutted between the abutment head 613 and the baffle 618. When cleaning the drain pipe, the return spring 617 is compressed under the impact of hot water, and the one-way channel in the valve body 601 is opened; after cleaning, the one-way channel is closed under the reverse force of the return spring 617 to prevent the sewage and exhaust gas in the drain pipe from flowing back.
[0059] The liquid outlet portion 611 is disposed at one side of the liquid outlet tank 610 and has a gradually expanding diameter, so as to facilitate the hot water in the liquid outlet tank 610 to be discharged to the transition pipe 7 in a timely manner.
[0060] The cleaning component 8 is connected to the transition pipe 7. When cleaning the drain pipe, the cleaning component 8 will inject cleaning agent into the transition pipe 7, and cooperate with hot water to improve the cleaning effect of the drain pipe. Figure 3 As shown, it is a cross-sectional view of the cleaning component 8, and the cleaning component 8 includes a fixing plate 801, a liquid storage bin 802, a liquid storage tank 803, a limiting column 804, a top plate 805, a first through groove 806, a second through groove 807, a liquid drainage bin 808 and a liquid drainage pipe 809.
[0061] The fixed plate 801 is fixed below the table 1, and the liquid storage tank 802 is rotatably arranged on the top of the fixed plate 801. The liquid storage tank 802 is provided with a liquid storage tank 803 for storing cleaning agent. The limiting column 804 is fixed on the top of the fixed plate 801 and passes through the liquid storage tank 802. The top plate 805 is fixed on the top of the limiting column 804, and the diameter of the top plate 805 is greater than the diameter of the limiting column 804.
[0062] When the liquid storage bin 802 rotates, it is limited by the limiting column 804 to prevent the liquid storage bin 802 from shaking. By setting the top plate 805, the liquid storage bin 802 is prevented from coming off the fixed plate 801.
[0063] The drain bin 808 is fixed at the bottom of the fixed plate 801 and is conical, which facilitates the cleaning agent to flow downward and flow into the transition pipe 7 through the drain pipe 809, thereby improving the cleaning effect of the drain pipe in combination with hot water.
[0064] like Figure 4As shown, the first through slot 806 penetrates the liquid storage bin 802, and the second through slot 807 penetrates the fixed plate 801, and the first through slot 806 and the second through slot 807 have the same shape, both of which are annular. By rotating the liquid storage bin 802, the overlapping area of the first through slot 806 and the second through slot 807 can be adjusted, thereby controlling the downflow of the cleaning agent in the liquid storage bin 802 or adjusting the amount of the cleaning agent downflow.
[0065] The flushing pipe 12 is integrally connected to one side of the main drain pipe 10 and is arranged at an angle. The inclined flushing pipe 12 can prevent the backflow of sewage in the drain pipe; at the same time, during cleaning, hot water containing cleaning agent flows from top to bottom to the drain pipe, thereby improving the cleaning effect.
[0066] The water pipe joint 9 is connected between the transition pipe 7 and the flushing pipe 12 so that the pipes are connected to each other.
[0067] The flushing and drainage principle of the pressurized flushing and drainage system for the kitchen of the utility model is as follows:
[0068] First, open the switch valve 5, and the hot water in the hot water pipe 3 passes through the water inlet pipe 4 and the one-way valve 6, and flows unidirectionally to the transition pipe 7. The cleaning component 8 injects cleaning agent into the transition pipe 7, and the cleaning agent mixed with hot water flows to the main drain pipe 10 and the secondary drain pipe 11 at the same time, thereby completing the cleaning work of the drain pipe.
[0069] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A pressurized flushing and drainage system for a kitchen, comprising a countertop (1), a cleaning pool (2) embedded at the bottom of the countertop (1), and a hot water pipe (3) arranged above the countertop (1), characterized in that: It also includes: A main drainage pipe (10), the main drainage pipe (10) being connected to the bottom of the cleaning tank (2); A secondary drainage pipe (11), the secondary drainage pipe (11) is connected to the bottom of the main drainage pipe (10) and is arranged obliquely; a one-way valve (6), wherein the one-way valve (6) is connected to the hot water pipe (3); A transition pipe (7), the transition pipe (7) being connected to a side of the one-way valve (6) away from the hot water pipe (3); A cleaning component (8), the cleaning component (8) being connected to the transition pipe (7), and a cleaning agent being stored in the cleaning component (8); A flushing pipe (12), wherein the flushing pipe (12) connects the transition pipe (7) and the main drainage pipe (10) and is arranged obliquely.
2. A kitchen pressurized flushing and drainage system according to claim 1, characterized in that: The inner side walls of the main drainage pipe (10) and the auxiliary drainage pipe (11) are provided with spiral flow channels.
3. A pressurized flushing and drainage system for a kitchen according to claim 1, characterized in that: The one-way valve (6) comprises a valve body (601) connected to a water inlet pipe (4) and a transition pipe (7), a liquid inlet groove and a liquid outlet groove (610) provided in the valve body (601), a transition groove (609) connecting the liquid inlet groove and the liquid outlet groove (610), and a blocking unit provided in the liquid outlet groove (610), wherein the liquid in the liquid inlet groove flows unidirectionally to the liquid outlet groove (610) through the blocking unit.
4. A kitchen pressurized flushing and drainage system according to claim 3, characterized in that: The blocking unit includes a push pin (612) elastically arranged in a liquid outlet groove (610), a liquid flow groove (615) provided in the push pin (612), a liquid through hole (616) arranged in a ring on the outside of the push pin (612), an abutment head (613) integrally connected to the push pin (612) on the side close to the liquid inlet groove, an inner abutment portion (614) obliquely arranged on the outside of the abutment head (613), and an outer abutment portion (608) connecting the liquid inlet groove and the transition groove (609) and being obliquely arranged. The liquid in the transition groove (609) flows into the liquid flow groove (615) through the liquid through hole (616). The diameter of the push pin (612) is equal to the inner diameter of the liquid outlet groove (610).
5. A kitchen pressurized flushing and drainage system according to claim 4, characterized in that: The blocking unit further comprises a baffle (618) fixed in the liquid outlet groove (610), a through hole (619) penetrating the baffle (618), and a return spring (617) arranged in the liquid flow groove (615), wherein the return spring (617) abuts between the abutment head (613) and the baffle (618).
6. A kitchen pressurized flushing and drainage system according to claim 3, characterized in that: The liquid inlet groove comprises a first liquid inlet groove (605) and a second liquid inlet groove (607) which are opened in the valve body (601), a first liquid inlet portion (604) which is obliquely arranged on one side of the first liquid inlet groove (605) and has a gradually expanding diameter, and a second liquid inlet portion (606) which connects the first liquid inlet groove (605) and the second liquid inlet groove (607), wherein the diameter of the first liquid inlet groove (605) is greater than the diameter of the second liquid inlet groove (607).
7. A kitchen pressurized flushing and drainage system according to claim 3, characterized in that: The one-way valve (6) further comprises a liquid outlet portion (611) which is arranged obliquely on one side of the liquid outlet groove (610) and has a gradually expanding diameter, a sealing groove (602) provided on both sides of the valve body (601), and a sealing ring (603) arranged in the sealing groove (602).
8. A kitchen pressurized flushing and drainage system according to claim 1, characterized in that: The cleaning assembly (8) comprises a fixed plate (801), a liquid storage bin (802) rotatably arranged on the top of the fixed plate (801), a first through groove (806) penetrating the liquid storage bin (802), a second through groove (807) penetrating the fixed plate (801), a liquid drainage bin (808) fixed to the bottom of the fixed plate (801), and a liquid drainage pipe (809) integrally connected to the bottom of the liquid drainage bin (808), wherein the liquid drainage pipe (809) is connected to the transition pipe (7), and the rotation of the liquid storage bin (802) can adjust the overlapping area of the first through groove (806) and the second through groove (807).
9. A kitchen pressurized flushing and drainage system according to claim 8, characterized in that: The cleaning assembly (8) further comprises a limiting column (804) fixed on the top of the fixing plate (801) and penetrating the liquid storage bin (802), and a top plate (805) fixed on the top of the limiting column (804), wherein the diameter of the top plate (805) is greater than the diameter of the limiting column (804).
10. A kitchen pressurized flushing and drainage system according to claim 1, characterized in that: It also includes a water inlet pipe (4) connecting the hot water pipe (3) and the one-way valve (6), a switch valve (5) arranged on the water inlet pipe (4), and a water pipe joint (9) connecting the transition pipe (7) and the flushing pipe (12).