CN110230347A - A kind of rain sewage diversion device - Google Patents

Abstract

The invention discloses a kind of rain sewage diversion devices, including housing cavity to separate rainy dirty separation chamber and blowdown room；Water inlet pipe and drainpipe are separately positioned on the both ends of the separation chamber Yu Wu；Float component and baffle plate assembly are disposed on the direction that the separation chamber Yu Wu extends from water inlet pipe to drainpipe, rainwater enters shell by the dirt in float component and baffle plate assembly barrier rainwater from water inlet pipe and is discharged from drainpipe；The output end position of blowdown room is provided with buoyancy flow regulating valve, and buoyancy flow regulating valve is connected with the sewage pipe for being mounted on blowdown room one end.The configuration of the present invention is simple, targeted rain sewage diversion processing can be carried out according to the different times of rainwater, pass through the variation drive float component of water level and floating up and down for baffle plate assembly, suspended matter, floating material and the sediment in rainwater or sewage can be retained while not interfering rainwater or drainage flow, effectively avoid the problem that sediment etc. is discharged into river or downstream Storm Sewer Network water pollution.

Description

A rain and sewage diversion device

technical field

The invention relates to the technical field of rainwater treatment, in particular to a rainwater diversion device.

Background technique

The rain and sewage diversion device is a device used to divert rainwater and sewage. Since urban sewage is collected and directly discharged into rivers will cause pollution, it needs to be collected and treated. In rainy days, rainwater will also enter the sewage collection system. Since the rainwater does not need to be treated, it will increase the treatment cost when it flows into the sewage treatment system. The sewage diversion device is used to separate rainwater and sewage.

The Chinese patent with the notification number CN205917828U discloses a rain and sewage diversion switching device, which includes an interception well, and the interception well is provided with an interception pipe flowing to the sewage pump station and an outlet pipe flowing to the natural water body. A valve and a second valve are respectively connected with the first gate and the second gate that realize the opening and closing of the first valve and the second valve, and the interception well on the left side of the overflow weir is provided with a first liquid level The probe, the second liquid level probe and the third liquid level probe are respectively installed at 5.0m, 5.4m and 6.7m in the interception well, the first liquid level probe, the second liquid level probe and the third liquid level probe The signal output ends of the three liquid level probes are all connected to the signal input ends of the controller, and the signal input ends of the controller are respectively connected to the first shutter and the second shutter. However, in actual use, rain and sewage diversion devices need to be installed in multiple locations in the same area, and more rain and sewage diversion devices need to be used in the same area. The cost of probes, valves and controllers for the rain and sewage diversion switching device High, so it will lead to a high cost of drainage in the whole region, which needs to be improved. Moreover, the deposition at the mouth of the drain pipe is relatively serious, and blockage may occur.

In order to overcome the deficiencies and defects in the background technology, the present invention provides a rain and sewage diversion device, which can solve the problems of high device cost and serious sedimentation and blockage of drainage pipes in the prior art.

Contents of the invention

The object of the present invention is to provide a rain and sewage diversion device with simple structure, low cost and high working efficiency.

The present invention is achieved through the following technical solutions:

A rain and sewage diversion device, comprising a housing, a water inlet pipe, a drain pipe, a buoy assembly, a baffle assembly, a buoyancy regulating valve and a sewage pipe, wherein:

The inner cavity of the housing is divided into a rain and sewage separation chamber and a sewage discharge chamber, and the rain and sewage separation chamber and the sewage discharge chamber are separated by a partition, and a sewage discharge channel connecting the rain and sewage separation chamber and the sewage discharge chamber is reserved in the partition;

The water inlet pipe and the drain pipe are respectively arranged at both ends of the rain-sewage separation chamber and the water inlet pipe is arranged at one end of the rain-sewage separation chamber near the sewage channel;

The rain-sewage separation chamber is sequentially provided with a buoy assembly and a baffle assembly in the direction extending from the water inlet pipe to the drain pipe. Discharge into sewage works;

A buoyancy regulating valve is arranged at the output end of the sewage discharge chamber, and the buoyancy regulating valve communicates with the sewage pipe installed at one end of the sewage discharge chamber.

Further, both ends of the buoy assembly are respectively mounted on the brackets on the inner wall of the housing through support rods, and the bracket and the support rods are hinged. When the buoy assembly moves up and down, the support rods are rotated relative to the bracket.

Further, the buoy assembly includes a buoy, a first buoy baffle and a second buoy baffle, the general structure of the buoy is a cylinder, and the outer edge end faces of the cylindrical buoy are cut off to form a pair of sections, a pair of sections The first buoy baffle and the second buoy baffle are respectively connected, and the area of the lower part of the first buoy baffle and the second buoy baffle relative to the buoy is larger than the area of the upper part.

Further, the baffle plate assembly includes a fixed plate and a moving plate, the fixed plate is fixedly installed in the rain and sewage separation chamber, and the moving plate is installed on the fixed plate and moves up and down relative to the fixed plate.

Further, the fixed plate includes a vertical surface and horizontal surfaces integrally formed at both ends of the vertical surface, the opposite surfaces of the pair of horizontal surfaces are provided with slide grooves matching the moving plate, and the pair of horizontal surfaces are bent and extended to form The limit stop used to prevent the movable plate from breaking away from the fixed plate.

Further, the fixed plate is also provided with a plurality of guide columns on the surface connected to the moving plate, and the moving plate is provided with guide grooves matching with the plurality of guide columns, and the guide columns of the fixed plate are embedded into the A connection is formed in the guide groove of the moving plate, and the moving plate moves up and down relative to the fixed plate under the guidance of the guide column and the guide groove.

Further, the moving plate is a floating plate, and the material of the moving plate is the same as that of the buoy.

Further, the rain-sewage separation chamber and the sewage discharge channel of the sewage chamber are provided with expanded grids, and the expanded grids are inclined relative to the direction in which rainwater enters the sewage chamber, and the inclination angle of the expanded grids is 60-80°.

Another object of the present invention is to provide a rain and sewage diversion method of a rain and sewage diversion device, comprising the following contents:

a. The initial rainwater or the sewage when it is not raining enters the shell from the water inlet pipe. Due to the small flow rate, the buoyancy regulating valve does not operate so that the valve is in an open state. The rainwater or sewage pretreated by the expanded grid is directly passed through the sewage pipe. into the sewage treatment plant;

b. The amount of rainwater or sewage in the middle period increases, and the action of the buoyancy regulating valve makes the opening angle of the valve very small. Only a small amount of rainwater or sewage enters the sewage plant through the sewage pipe, and most of the rainwater or sewage remains in the shell and passes through the rainwater. The sewage separation chamber is used for rain and sewage separation treatment, and the rainwater after rain and sewage separation is passed into the storage tank or water body through the drainage pipe;

c. The amount of rainwater or sewage increases significantly in the later period. The action of the buoyancy regulating valve makes the valves all closed. into storage tanks or bodies of water;

d. The amount of water without rain is greatly reduced, and the buoyancy regulating valve is opened to complete a cycle of rain and sewage diversion.

Further, the contents of the rain and sewage separation treatment described in b and c are as follows:

1) When the water level increases, the buoy floats up to drive the first buoy baffle and the second buoy baffle to float, and continuously intercepts the floating and suspended matter in the rainwater or sewage during the flow of rainwater or sewage;

2) When the water level increases, the moving plate will float up to intercept the sediment in the rainwater or sewage due to the buoyancy, and the fixed plate is fixed to block the sediment intercepted by the moving plate.

The beneficial effects of the present invention are: the present invention is simple in structure, can carry out targeted rain and sewage diversion treatment according to different periods of rainwater, sets buoy components and baffle components at intervals, and drives the up and down of the buoy components and baffle components through the change of water level Floating, without interfering with the flow of rainwater or sewage, can intercept suspended solids, floating solids and sediments in rainwater or sewage, effectively avoiding the problem of sediments being discharged into rivers or downstream rainwater pipe network water quality pollution. , greatly improving work efficiency, and the whole device does not involve controllers, sensors and other equipment, which greatly reduces the equipment cost of rainwater treatment, which is convenient and practical.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a structural schematic diagram of the buoy assembly of the present invention.

Fig. 4 is a schematic structural diagram of the upper buoy and the first buoy baffle in Fig. 3 .

Fig. 5 is a schematic structural view of the baffle assembly of the present invention.

Fig. 6 is a schematic structural view of the fixed plate of the present invention.

Fig. 7 is another structural schematic diagram of the fixed plate of the present invention.

Fig. 8 is a schematic structural view of the moving plate of the present invention.

Fig. 9 is a schematic diagram of the floating state of the moving plate of the present invention.

Fig. 10 is a schematic diagram of a state in which the moving plate of the present invention floats up substantially.

Fig. 11 is a schematic flowchart of a rain and sewage diversion method of a rain and sewage diversion device according to the present invention.

in:

1. Shell;

101. Rain and sewage separation chamber;

102. Sewage room;

2. Partition;

3. Sewage channel;

4. Water inlet pipe;

5. Drainage pipe;

6. The buoy assembly;

601, buoy;

602. The first buoy baffle;

603, the second buoy baffle;

7. Baffle assembly;

701, fixed plate;

7011. Facade;

7012. Horizontal plane;

7013, limit gear;

7014, chute;

7015, guide column;

702, moving plate;

7021, guide groove;

8. Buoyancy regulating valve;

9. Sewage pipe;

10. Support rod;

11. Bracket;

12. Pulled grid.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Examples of the described embodiments are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

A rain and sewage diversion device as shown in Figures 1 to 10 includes a housing 1, a water inlet pipe 4, a drain pipe 5, a buoy assembly 6, a baffle assembly 7, a buoyancy regulating valve 8 and a sewage pipe 9, wherein the housing The inner cavity of the body 1 is divided into a rain and sewage separation chamber 101 and a sewage discharge chamber 102. The rain and sewage separation chamber 101 and the sewage discharge chamber 102 are separated by a partition 2, and the partition 2 is reserved for a communication between the rain and sewage separation chamber 101 and the sewage discharge chamber 102. Sewage channel 3; water inlet pipe 4 and drain pipe 5 are respectively arranged at the two ends of rain-sewage separation chamber 101 and water inlet pipe 4 is arranged at the end of rain-sewage separation chamber 101 close to sewage passage 3; 4 A buoy assembly 6 and a baffle assembly 7 are arranged in sequence in the direction extending toward the drain pipe 5. Rainwater enters the housing 1 from the water inlet pipe 4 and passes through the buoy assembly 6 and the baffle assembly 7 to block the dirt in the rainwater and discharge it from the drain pipe 5. Discharging: a buoyancy regulating valve 8 is provided at the output end of the sewage chamber 102 , and the buoyancy regulating valve 8 communicates with the sewage pipe 9 installed at one end of the sewage chamber 102 .

In this embodiment, the two ends of the buoy assembly 6 are respectively installed on the bracket 11 on the inner side wall of the housing 1 through the support rod 10. The bracket 11 and the support rod 10 are hingedly arranged. When the buoy assembly 6 moves up and down, the support The rod 10 is arranged to rotate relative to the bracket 11. More specifically, as shown in FIG. The outer edge end surface of the cylindrical buoy 601 is truncated to form a pair of sections, which are respectively connected to the first buoy baffle 602 and the second buoy baffle 603, and the first buoy baffle 602 and the second buoy baffle 603 are opposite to the buoy 601 The area of the lower part is greater than the area of the upper part;

When there is initial rain or no rain, the water level does not increase, and the buoy assembly 6 is in its original state, that is, the bottoms of the first buoy baffle 602 and the second buoy baffle 603 are against the bottom of the shell 1, and the rainwater or sewage is cut off and cannot pass through;

In the mid-term, the amount of rainwater or sewage water increases, and the water level increases. The buoy 601 floats up so that the first buoy baffle 602 and the second buoy baffle 603 move upward, and the floating objects in the rainwater or sewage will be removed in the process of not interfering with the flow of rainwater or sewage. and suspended solids;

In the later stage, the water volume of rainwater or sewage increases greatly, and the water level increases greatly. The buoy 601 continues to float up so that the first buoy baffle 602 and the second buoy baffle 603 continue to move upward, and the rainwater or sewage will be discharged in the process of not interfering with the flow of rainwater or sewage. Floating and suspended matter intercepted;

The amount of water stopped by the rain is greatly reduced, and the water level does not increase substantially. The buoy assembly 6 resets automatically, and the rainwater or sewage are cut off and cannot pass through.

In this embodiment, as shown in Figure 5, the baffle plate assembly 7 includes a fixed plate 701 and a moving plate 702, the fixed plate 701 is fixedly installed in the rain and sewage separation chamber 101, and the moving plate 702 is installed on the fixed plate 701 and relatively fixed The plate 701 moves up and down, the moving plate 702 is a floating plate, and the material of the moving plate 702 is the same as that of the buoy 601. More specifically, as shown in Figure 6, the fixed plate 701 includes a facade 7011 and an integrally formed surface The horizontal planes 7012 at both ends of the 7011, the opposite surfaces of the pair of horizontal planes 7012 are provided with slide grooves 7014 that match the moving plate 702, and the pair of horizontal planes 7012 are relatively bent and extended to form a limit for preventing the moving plate 702 from detaching from the fixed plate 701 Block 7013.

As shown in Figures 7 and 8, the fixed plate 701 is also provided with a plurality of guide columns 7015 on the surface connected to the moving plate 702, and the moving plate 702 is provided with guide grooves 7021 adapted to the plurality of guide columns 7015 , the guide column 7015 of the fixed plate 701 is embedded in the guide groove 7021 of the moving plate 702 to form a connection, and the moving plate 702 moves up and down relative to the fixed plate 701 under the guidance of the guide column 7015 and the guide groove 7021, and plays a guiding role at the same time It can also make the moving plate 702 not break away from the fixed plate 701 when moving up and down;

When there is initial rain or no rain, the water level does not increase, and the baffle plate assembly 7 is in the original state, that is, the bottom of the fixed plate 701 and the bottom of the housing 1 have a distance that does not interfere with the flow of rainwater or sewage when the maximum water level is allowed, and the moving plate 702 moves down to the bottom of the fixed plate 701 and the bottom of the moving plate 702 touches the bottom of the housing 1, and the rainwater or sewage is cut off and cannot pass through;

In the mid-term, the amount of rainwater or sewage water increases, and the water level increases. The moving plate 702 floats on the fixed plate 701 and moves upward, as shown in Figure 9. The sediment in the rainwater or sewage is intercepted in the process of not interfering with the circulation of rainwater or sewage. , the fixed plate 701 blocks the sediment retained by the movable plate 702 so that the sediment is trapped in the casing 1 and does not enter the drain pipe;

In the later period, the amount of rainwater or sewage water increases greatly, and the water level increases greatly. The moving plate 702 continues to float on the fixed plate 701 and continues to move upward, as shown in Figure 10. The fixed plate 701 blocks the sediment intercepted by the movable plate 702 so that the sediment is trapped in the housing 1 and does not enter the drain pipe;

The amount of water stopped by rain is greatly reduced, and the water level does not increase substantially. The baffle plate assembly 7 resets automatically, and rainwater or sewage are cut off and cannot pass through.

In this embodiment, the rain-sewage separation chamber 101 and the sewage channel 3 of the sewage chamber 102 are provided with an expanded grid 12, and the expanded grid 12 is obliquely arranged relative to the direction in which rainwater enters the sewage chamber 102, and the expanded grid 12 The inclination angle is 60-80°, and the preferred inclination angle of the expanded grid 12 is 70°, which can intercept some floating and suspended matter in rainwater or sewage.

Another object of the present invention is to provide a rain and sewage diversion method for a rain and sewage diversion device, as shown in Figure 11, including the following:

a. The initial rainwater or the sewage when it is not raining enters the shell from the water inlet pipe. Due to the small flow rate, the buoyancy regulating valve 8 does not operate so that the valve is in an open state, and the rainwater or sewage pretreated by the expanded grid 12 directly passes through the sewage Pipe 9 passes into the sewage plant for treatment;

b. The amount of rainwater or sewage in the middle period increases, the buoyancy regulating valve 8 moves so that the opening angle of the valve is very small, only a small amount of rainwater or sewage enters the sewage plant through the sewage pipe 9, and most of the rainwater or sewage stays in the shell 1 The rain and sewage separation process is carried out through the rain and sewage separation chamber 101. When the water level increases, the buoy 601 floats up to drive the first buoy baffle 602 and the second buoy baffle 603 to float up, and the rainwater or sewage is continuously intercepted during the flow of rainwater or sewage. Floating and suspended solids in sewage; due to buoyancy, the moving plate 702 will float up to intercept the sediment in rainwater or sewage, and the fixed plate 701 will not move to block the sediment intercepted by the moving plate 702. After the rain and sewage are separated, the rainwater will pass through the drainage , 5 into the storage tank or water body;

c. In the later stage, the amount of rainwater or sewage increases greatly, and the action of the buoyancy regulating valve 8 makes the valves all closed. 601 continues to float up to drive the first buoy baffle 602 and the second buoy baffle 603 to continue to float up, and continuously intercept the floating and suspended matter in the rainwater or sewage during the flow of rainwater or sewage; the moving plate 702 will continue to float due to buoyancy. Float up to intercept the sediment in the rainwater or sewage, and the fixed plate 701 is fixed to block the sediment retained by the movable plate 702. After the rainwater is separated from the rainwater, the rainwater is passed into the storage tank or water body through the drain pipe 5;

d. The amount of water in case of rain is greatly reduced, and the buoyancy regulating valve 8 is opened to complete a cycle of rain and sewage diversion.

The beneficial effects of the present invention are: the present invention is simple in structure, can carry out targeted rain and sewage diversion treatment according to different periods of rainwater, sets buoy components and baffle components at intervals, and drives the up and down of the buoy components and baffle components through the change of water level Floating, without interfering with the flow of rainwater or sewage, can intercept suspended solids, floating solids and sediments in rainwater or sewage, effectively avoiding the problem of sediments being discharged into rivers or downstream rainwater pipe network water quality pollution. , greatly improving work efficiency, and the whole device does not involve controllers, sensors and other equipment, which greatly reduces the equipment cost of rainwater treatment, which is convenient and practical.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of rain sewage diversion device, it is characterised in that: including shell, water inlet pipe, drainpipe, float component, baffle plate assembly, float Power flow regulating valve and sewage pipe, in which:

The housing cavity separates rainy dirty separation chamber and blowdown room, between the separation chamber Yu Wu and blowdown room by partition every It opens and partition is reserved with the drain outlet of the separation chamber connection Yu Wu and blowdown room；

The water inlet pipe and drainpipe are separately positioned on the both ends of the separation chamber Yu Wu and water inlet pipe setting is close in the separation chamber Yu Wu One end of drain outlet；

Float component and baffle plate assembly, rain are disposed on the direction that the separation chamber Yu Wu extends from water inlet pipe to drainpipe Water enters shell by the dirt in float component and baffle plate assembly barrier rainwater from water inlet pipe and is discharged into sewage plant from sewage pipe；

The output end position of the blowdown room is provided with buoyancy flow regulating valve, buoyancy flow regulating valve and the sewage for being mounted on blowdown room one end Pipe is connected.

2. a kind of rain sewage diversion device according to claim 1, it is characterised in that: the both ends of the float component lead to respectively It crosses support rod to be mounted on the bracket of case inside wall, is hingedly to be arranged between bracket and support rod, is transported above and below float component When dynamic, support rod is arranged with respect to holder pivots.

3. a kind of rain sewage diversion device according to claim 2, it is characterised in that: the float component includes floating drum, One floating drum baffle and the second floating drum baffle, the general structure of the floating drum are in cylindrical body, and the outer rim end face quilt of cylindrical body floating drum Truncation forms a pair cross-section, and a pair cross-section is separately connected the first floating drum baffle and the second floating drum baffle, the first floating drum baffle and the Two floating drum baffles are greater than top area with respect to the lower part area of floating drum.

4. a kind of rain sewage diversion device according to claim 1, it is characterised in that: the baffle plate assembly includes fixed board and moves Plate, the fixed board are fixedly mounted in the separation chamber Yu Wu, and movable plate is mounted on fixed board and opposite fixed board moves up and down.

5. a kind of rain sewage diversion device according to claim 4, it is characterised in that: the fixed board includes a facade and one Body is formed in the horizontal plane at the facade both ends, and the opposite face of a pair of of horizontal plane is provided with sliding slot compatible with movable plate, and one The limiting block for stopping movable plate to be detached from fixed board is extended to form to the opposite bending of horizontal plane.

6. a kind of rain sewage diversion device according to claim 4, it is characterised in that: the fixed board is being connected with movable plate It is additionally provided with multiple guide posts on face, guide groove compatible with multiple guide posts, the guiding of fixed board are provided on the movable plate Column, which is embedded into the guide groove of movable plate, forms connection and movable plate opposite fixed board up and down motion under guide post and the guiding of guide groove.

7. a kind of rain sewage diversion device according to claim 6, it is characterised in that: the movable plate is kickboard, and movable plate Material is identical as the material of floating drum.

8. a kind of rain sewage diversion device according to claim 1, it is characterised in that: the separation chamber Yu Wu and blowdown room It is provided with seine grid on drain outlet, the direction that seine grid enters blowdown room with respect to rainwater is obliquely installed, and draws in the net grid Tilt angle is 60-80 °.

9. a kind of rain sewage diversion method of rain sewage diversion device according to any one of claims 1 to 8, it is characterised in that: Including following content:

A, initial rainwater or sewage when not raining enter shell from water inlet pipe, and since flow is small, buoyancy flow regulating valve is failure to actuate and is made It is in the open state to obtain valve, directly passes through sewage pipe by the pretreated rainwater of seine grid or sewage and is passed through sewage factory and office Reason；

B, the water of mid-term rainwater or sewage increases, and buoyancy flow regulating valve acts the angle very little so that valve opening, only on a small quantity Rainwater or sewage are passed through sewage plant by sewage pipe, and most of rainwater or sewage are stayed in shell and carried out by the separation chamber Yu Wu Rain dirt separating treatment, the rainwater after rain dirt separation are passed through storage pond or water body by drainpipe；

C, the water of later period rainwater or sewage is significantly increased, and buoyancy flow regulating valve acts so that valve all closings, rainwater or sewage It all stays in shell and rain dirt separating treatment is carried out by the separation chamber Yu Wu, the rainwater after rain dirt separation is passed through by drainpipe Storage pond or water body；

D, the rain amount of cutting off the water is greatly decreased, and buoyancy flow regulating valve opens a cycle for completing rain sewage diversion.

10. a kind of rain sewage diversion method of rain sewage diversion device according to claim 9, it is characterised in that: institute in b and c The content for the rain dirt separating treatment stated is as follows:

1) water level increases, and floating drum, which floats, drives the first floating drum baffle and the second floating drum baffle to float, in rainwater or drainage flow Continual retention rainwater or floating material and suspended matter in sewage in the process；

2) water level increases, movable plate since buoyancy can float the sediment retained in rainwater or sewage, fixed board is fixed stop it is dynamic The sediment that plate is retained down.