A kind of biomass solid fuel burner with high efficiency
Technical field
The invention belongs to technical field of burner, specifically a kind of biomass solid fuel burner with high efficiency.
Background technique
Biomass refers to the various organisms generated using big gas and water, soil etc. by photosynthesis, i.e., one cuts with life
The organic substance that can be grown of life is commonly referred to as biomass, and stalk is also a part for belonging to biomass, and stalk is mature farming
The general name of object stem and leaf part is often referred to wheat, rice, corn, potato, rape, cotton, sugarcane and other crops in harvest seed
Remainder after reality, the photosynthetic product of crops have more than half to be present in straw, stalk rich in nitrogen, phosphorus, potassium, calcium,
Magnesium and organic matter etc., be it is a kind of there are multiduty reproducible living resources, it is also a kind of that stalk is a kind of roughage simultaneously
Reproducible fuel.
Also occur the technical solution of some biomass solid fuel burner with high efficiency in the prior art, such as application No. is
2014103084441 Chinese patent discloses a kind of straw particle burner, including furnace body, feed bin and combustion chamber, institute
It states and is communicated in feed bin and furnace, pusher is equipped with below feed bin, the charging ram of pusher makees reciprocating linear fortune below feed bin
It is dynamic;It is equipped with an air compartment below the combustion chamber, air holes is equipped between air compartment and combustion chamber one time, is equipped with igniting above air holes
Hole;Secondary air chamber is communicated with combustion chamber, and towards fire hole, the air outlet of secondary air channel is located at two in the air pushing hole direction of secondary air chamber
In secondary air compartment.
A kind of straw particle burner of the technical solution burns to stalk particle by secondary air, stalk combustion
It is easy to be covered by plant ash during burning, causes part stalk that can not burn, combustion rate is low, when stalk is pushed into, since stalk is
Graininess, inside stalk is unable to fully burn when accumulation, and the thermal energy of burning can not utilize, and leads to the waste of the energy, and stalk fires
It burns the plant ash generated and is easy blocking air holes, cause oxygen in burner insufficient, burn insufficient, while it is not comprehensive enough to light a fire,
It is easy to cause part stalk that can not light, keeps straw burning insufficient.
Summary of the invention
In order to make up for the deficiencies of the prior art, it solves to be easy to be covered by plant ash during straw burning, leads to part straw
Stalk can not burn, stalk accumulation causes internal stalk to be unable to fully burning, the thermal energy of burning can not utilize, and lead to the wave of the energy
Take, the easy blocking air holes of plant ash that straw burning generates, causes oxygen in burner insufficient, burn insufficient and light a fire inadequate
Comprehensively, it is easy to cause part stalk that can not light, makes the problem that straw burning is insufficient, a kind of biomass proposed by the present invention is solid
Fluid fuel burner with high efficiency.
The technical solution adopted by the present invention to solve the technical problems is: a kind of biomass solid fuel of the present invention
Burner with high efficiency, including framework and controller;The controller is for controlling burner operation;Offered at the top of the framework into
Material mouth;The framework bottom is equipped with discharge nozzle;Pulverizing unit is equipped with below the feeding inlet, pulverizing unit is driven by a motor, and is used
It is crushed in by biomass, motor is located at framework outer right wall, and motor is clockwise and anticlockwise motor;The pulverizing unit includes the first shifting
Movable plate, the second movable plate and rotor plate;The first movement plate and the second movable plate are slidably connected to framework top inner wall, and
It is located at the two sides of feeding inlet;The rotor plate is between first movement plate and the second movable plate;The first movement plate
Left lateral sides are fixed with igniting plate;The igniter being evenly arranged, and leftmost side igniter and right side are equipped with below the igniting plate
Igniter is obliquely installed, and improves ignition range, prevents burning dead angle;The first movement plate and the second mobile plate surface are opened
Equipped with opening, it is screwed with thread groove in opening, and thread groove is oppositely oriented;The shaft of the motor penetrates framework setting, and
It is open across two;The shaft surface of the motor is screwed with screw thread, and screw thread is meshed with thread groove;The rotor plate is fixedly attached
In machine shaft surface;The first movement plate and the second movable plate opposite side are equipped with the first double wedge being evenly arranged;Institute
State the first double wedge annular design;The two sides side of the movable plate is equipped with the second double wedge being evenly arranged, the second double wedge annulus
Shape design, can engage with the first double wedge;By the positive and negative rotation of motor, realize that first movement plate and the second movable plate are opposite and opposite
Movement, passes through the engagement of the first double wedge and the second double wedge and the rotation of rotor plate, crushed biomass;Under the pulverizing unit
Side is equipped with fixed plate and filter plate;The filter plate is used to filter the plant ash generated after biomass combustion;The fixed plate
One end is fixed on inner wall on the right side of framework, and one end of the other end and filter plate is connected, and the other end of filter plate is fixed on the left of framework
Inner wall;The filter surface is evenly arranged with protrusion, and the contact area of biomass and air can be improved;Under the pulverizing unit
Side is equipped with elastic plate;The elastic plate is made of elastic heat-resisting material, and elastic plate is obliquely installed one end and is fixed on fixed plate
Upper surface, the other end are fixed on inner wall on the right side of framework;Through-hole is offered in the fixed plate;Is rotatably connected in the through-hole
One shaft;Fixed link is equipped with above the fixed plate;Described fixed link one end is fixed on elastic plate lower surface, and the other end is fixed on
First rotating shaft surface;The first rotating shaft and machine shaft are driven by the rope made of hemp;Sink is offered in the framework, sink is built-in
Full water, water float after being heated to be vapor, can preheat to the biomass of feeding inlet, while can connect outside, for generating electricity
It cooks, biomass preheats the rate of lighting that biomass can be improved, while realizing the recycling of water resource;When work, motor is rotated forward,
Relatively move first movement plate and the second movable plate by the engagement of screw thread and thread groove, while rotor plate rotates, by the
It is broken to carry out grinding to biomass for the engagement of one double wedge and the second double wedge and the rotation of rotor plate, and motor rotating forward passes through fiber crops
Rope rotates forward first rotating shaft, pulls elastic plate by fixed link, makes elastic plate bending, motor reversal, elastic plate momentary recovery will
The biomass of elastic plate surface bounces, and is lighted a fire by igniter, and igniting can be made more abundant, keep biomass combustion more abundant,
Motor reversal simultaneously, makes first movement plate and the second movable plate back movement, while rotating board reversal, and first movement plate or so moves
It is dynamic, it drives igniter to move left and right, to improve ignition range, prevents biomass igniting dead angle, improve biomass combustion efficiency.
Preferably, the filter plate is made of the ultralight aluminosilicate material of long filament, and the ultralight alumina silicate of long filament has performance steady
The feature fixed, the long tensile strength of fiber is big, thermal coefficient is low, heat-proof quality is good, sound absorption properties are excellent and anti-rapid heat cycle performance is good;Institute
It states filter plate lower surface and is fixed with iron plate, iron plate does not influence the filter effect of filter plate;The first rotating shaft surface, which is fixed with, to be hit
Make bar;The striking rod L shape design, and striking rod is fixed with convex block close to the side side of iron plate;When work, first rotating shaft
Rotating and reverse makes striking rod intermittence strike iron plate, shakes filter plate by iron plate, reinforces preventing while filter effect
Filter plate blocking, and filter plate shakes, and biomass can be made to shake, to increase the contact area of biomass and air, make biology
Matter burning is more abundant, while biomass shakes, and can shake off the plant ash that biological surface adheres to, preventing can not inside biomass
Burning, causes to burn insufficient.
Preferably, cavity is offered in the filter plate, and filter plate upper surface offers the solarization air cap being evenly arranged, expose
Stomata is connected to cavity;Side is fixed with pressure ram on the right side of the striking rod;The pressure ram upper surface is fixed with cam;It is described solid
Fixed board lower surface is equipped with air bag;The connected cam of the air bag and fixed plate, and air bag is connected to cavity and the external world, junction is set
There is check valve, guarantees that gas is entered in cavity from the external world by air bag;First rotating shaft inverts when work, makes cam engagement fixed plate
Extruding gasbag provides oxygen for biomass combustion, improves efficiency of combustion, together so that gas in air bag be made to expose by solarization air cap
When gas filter plate can be assisted to shake biomass when exposing.
Preferably, it is equipped with agitating unit in the framework, biomass can be stirred, improves biomass combustion efficiency;
The agitating unit includes the second shaft, stirring rod and agitator arm;The framework top inner wall offers aperture, aperture inner wall
It is screwed with thread groove;Second shaft is vertically arranged, and is pierced by outside framework by aperture and is passed between machine shaft by the rope made of hemp
Dynamic, motor can be such that the second shaft rotates forward;Second shaft surface offers screw thread, and screw thread is meshed with thread groove;It is described to stir
It mixes bar and is fixed on the second shaft lower end, and stirring rod lower surface cambered surface designs, and filter plate is prevented to be destroyed;The agitator arm position
Above stirring rod, and it is fixedly sheathed in the second shaft surface;Second shaft surface is socketed with torsional spring, and one end of torsional spring is solid
It is connected in framework inner wall, the other end is fixed on the second shaft surface;When work, motor, which is rotated forward, is driving the second shaft just by the rope made of hemp
Turn, move down the second shaft while rotating forward by the engagement of screw thread and thread groove, so that agitator arm and stirring rod be made to rotate forward
While move down, agitator arm rotating forward can be to filter surface pectinid, to improve the efficiency of combustion of biomass, while wind can assist
Filter plate is helped, accelerates the filter effect of filter plate, and the plant ash that biological surface adheres to can be dispelled, stirring rod rotates forward same
When move down, can contact filter surface, stir biomass, the plant ash of biological surface can be shot down, while protrusion can be hit,
Assist filter plate vibration, accelerate filter effect, motor reversal, by the effect of torsional spring can make the second shaft invert while on
It moves.
Preferably, the both ends of the iron plate lower surface are fixed with plate conveyor;The plate conveyor and discharge nozzle are all made of bullet
Property material is made;The plate conveyor lower end is respectively fixedly connected in the two sides side of discharge nozzle;When work, iron plate can drive fortune when shaking
Input board vibration, so that discharge nozzle be driven to shake, can prevent plant ash adhesion plate conveyor and discharge nozzle.
Preferably, filter screen is fixed between the first movement plate and the second movable plate;The filter screen is using elasticity
Steel wire is worked out;The filter screen is located at below movable plate;Spring is fixed between the filter screen lower surface and elastic plate;
The spring is made of heat-resisting material;When work, first movement plate and the second movable plate drove with back movement relatively
Strainer shake, reaches lastics effect, guarantees that stalk crushes completely, and spring and elastic plate can assist the vibration of filter screen, improves
Vibration frequency, while spring can promote the elasticity of elastic plate, reinforce elastic plate lastics effect, reach mutually auxiliary facilitation.
Beneficial effects of the present invention are as follows:
1. a kind of biomass solid fuel burner with high efficiency of the present invention, by the way that pulverizing unit and igniter is arranged,
By the relative movement of first movement plate and the second movable plate, cooperate the rotation of rotor plate, nibbles the first double wedge and the second double wedge
It closes, biomass straw is sheared and is ground, crush biomass straw more thorough, prevent biomass straw is excessive from causing to fire
Burn insufficient, while igniter is removable, effectively prevent biomass straw to light and is not thorough, cause part biological matter stalk without
Method burning.
2. a kind of biomass solid fuel burner with high efficiency of the present invention, by the way that the second shaft, elastic plate, mistake is arranged
Filter plate and striking rod are made elastic plate bending and are stretched by rotating and reverse for the second shaft, by biomass straw bullet to filtering
Plate surface shakes filter plate by striking rod, and cooperation solarization air cap aeration improves the filter effect of filter plate, while making biology
Matter stalk surface plant ash is fallen, and solarization air cap can provide sufficient oxygen, keep straw burning abundant.
3. a kind of biomass solid fuel burner with high efficiency of the present invention, by the way that agitating unit and plate conveyor is arranged,
Biomass straw can be stirred by agitating unit, prevents biomass straw from accumulating, and assists filter plate vibration, improves biomass
The efficiency of combustion of stalk, and agitator arm can assist to be aerated, and flow gas, accelerate the burning velocity of stalk, while filter plate
Vibration can be such that plate conveyor shakes, and prevent plant ash adhesion.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is main view of the invention;
Fig. 2 is partial enlarged view at A in Fig. 1;
In figure: framework 1, feeding inlet 11, motor 12, discharge nozzle 13, plate conveyor 14, sink 15, pulverizing unit 2, first move
Movable plate 21, the second movable plate 22, rotor plate 23, igniting plate 24, igniter 25, the first double wedge 26, the second double wedge 27, filter screen
28, spring 29, fixed plate 3, elastic plate 31, through-hole 32, first rotating shaft 33, fixed link 34, pressure ram 35, cam 36, air bag 37,
Filter plate 4, iron plate 42, striking rod 43, convex block 44, cavity 45, solarization air cap 46, agitating unit 5, the second shaft 51, stirs protrusion 41
Mix bar 52, agitator arm 53, torsional spring 54.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
As shown in Figure 1 to Figure 2, a kind of biomass solid fuel burner with high efficiency, including framework 1 and controller;The control
Device processed is for controlling burner operation;Feeding inlet 11 is offered at the top of the framework 1;1 bottom of framework is equipped with discharge nozzle 13;
Pulverizing unit 2 is equipped with below the feeding inlet 11, pulverizing unit 2 is driven by motor 12, for biomass to be crushed, 12, motor
In 1 outer right wall of framework, and motor 12 is clockwise and anticlockwise motor;The pulverizing unit 2 includes first movement plate 21, the second movable plate
22 and rotor plate 23;The first movement plate 21 and the second movable plate 22 are slidably connected to 1 top inner wall of framework, and position respectively
In the two sides of feeding inlet 11;The rotor plate 23 is located between first movement plate 21 and the second movable plate 22;The first movement
21 left lateral sides of plate are fixed with igniting plate 24;The igniter 25 being evenly arranged, and leftmost side point are equipped with below the igniting plate 24
Firearm 25 is obliquely installed with right side igniter 25, improves ignition range, prevents burning dead angle;The first movement plate 21 and
Two movable plates, 22 surface offers opening, is screwed with thread groove in opening, and thread groove is oppositely oriented;The motor 12
Shaft penetrates the setting of framework 1, and passes through two openings;The shaft surface of the motor 12 is screwed with screw thread, screw thread and thread groove phase
Engagement;The rotor plate 23 is fixedly sheathed in 12 shaft surface of motor;The first movement plate 21 and the second movable plate 22 are opposite
It is equipped with the first double wedge 26 being evenly arranged on one side;First double wedge, 26 annular design;The two sides side of the movable plate is equal
Equipped with the second double wedge 27 being evenly arranged, the design of 27 circular ring shape of the second double wedge can be engaged with the first double wedge 26;Pass through motor 12
Positive and negative rotation, realizes first movement plate 21 and the second movable plate 22 is opposite and back movement, passes through the first double wedge 26 and the second double wedge
27 engagement and the rotation of rotor plate 23, crushed biomass;Fixed plate 3 and filter plate 4 are equipped with below the pulverizing unit 2;
The filter plate 4 is used to filter the plant ash generated after biomass combustion;Described 3 one end of fixed plate is fixed on 1 right side of framework
One end of inner wall, the other end and filter plate 4 is connected, and the other end of filter plate 4 is fixed on 1 inner left wall of framework;The filter plate 4
Surface is evenly arranged with protrusion 41, and the contact area of biomass and air can be improved;Elastic plate is equipped with below the pulverizing unit 2
31;The elastic plate 31 is made of elastic heat-resisting material, and elastic plate 31 is obliquely installed one end and is fixed on table in fixed plate 3
Face, the other end are fixed on 1 right side inner wall of framework;Through-hole 32 is offered in the fixed plate 3;It is rotatably connected in the through-hole 32
First rotating shaft 33;Fixed link 34 is equipped with above the fixed plate 3;Described 34 one end of fixed link is fixed on 31 lower surface of elastic plate,
The other end is fixed on 33 surface of first rotating shaft;The first rotating shaft 33 and 12 shaft of motor are driven by the rope made of hemp;In the framework 1
Sink 15, the built-in full water of sink 15 are offered, water floats after being heated to be vapor, can carry out to the biomass of feeding inlet 11 pre-
Heat, while outside can be connected, it cooks for generating electricity, biomass preheats the rate of lighting that biomass can be improved, while realizing that water provides
The recycling in source;When work, motor 12 is rotated forward, and makes first movement plate 21 and the second movable plate by the engagement of screw thread and thread groove
22 relative movements, while rotor plate 23 rotates, and passes through the engagement of the first double wedge 26 and the second double wedge 27 and turning for rotor plate 23
It is dynamic, it is broken that grinding is carried out to biomass, and the rotating forward of motor 12 rotates forward first rotating shaft 33 by the rope made of hemp, pulls by fixed link 34
Elastic plate 31 is bent elastic plate 31, and motor 12 inverts, 31 momentary recovery of elastic plate, by the biomass bullet on 31 surface of elastic plate
It rises, is lighted a fire by igniter 25, igniting can be made more abundant, keep biomass combustion more abundant, while motor 12 inverts, make the
22 back movement of one movable plate 21 and the second movable plate, while rotor plate 23 inverts, first movement plate 21 moves left and right, and drives point
Firearm 25 moves left and right, to improve ignition range, prevents biomass igniting dead angle, improves biomass combustion efficiency.
As one embodiment of the present invention, the filter plate 4 is made of the ultralight aluminosilicate material of long filament, and long filament is super
Light alumina silicate is with performance is stable, the long tensile strength of fiber is big, thermal coefficient is low, heat-proof quality is good, sound absorption properties are excellent and anti-chilling
The characteristics of anxious good in thermal property;4 lower surface of filter plate is fixed with iron plate 42, and iron plate 42 does not influence the filter effect of filter plate 4;
33 surface of first rotating shaft is fixed with striking rod 43;43 L shape of the striking rod design, and striking rod 43 is close to iron plate 42
Side side is fixed with convex block 44;When work, first rotating shaft 33, which rotates and reverse, makes the intermittent impact iron plate 42 of striking rod 43, leads to
Crossing iron plate 42 shakes filter plate 4, reinforces preventing filter plate 4 from blocking while filter effect, and filter plate 4 shakes, and can make to give birth to
Substance vibration, to increase the contact area of biomass and air, keeps biomass combustion more abundant, while biomass shakes, can
The plant ash that biological surface adheres to is shaken off, prevents from not burning inside biomass, causes to burn insufficient.
As one embodiment of the present invention, cavity 45 is offered in the filter plate 4, and 4 upper surface of filter plate is opened
Equipped with the solarization air cap 46 being evenly arranged, solarization air cap 46 is connected to cavity 45;The 43 right side side of striking rod is fixed with pressure ram 35;
35 upper surface of pressure ram is fixed with cam 36;3 lower surface of fixed plate is equipped with air bag 37;The air bag 37 is connected cam
36 and fixed plate 3, and air bag 37 and cavity 45 and it is extraneous be connected to, junction is equipped with check valve, guarantees that gas passes through from the external world
Air bag 37 enters in cavity 45;When work, first rotating shaft 33 is inverted, and so that cam 36 is cooperated 3 extruding gasbag 37 of fixed plate, to make
Gas is exposed by solarization air cap 46 in air bag 37, provides oxygen, raising efficiency of combustion for biomass combustion, while when gas exposes
Filter plate 4 can be assisted to shake biomass.
As one embodiment of the present invention, it is equipped with agitating unit 5 in the framework 1, biomass can be stirred,
Improve biomass combustion efficiency;The agitating unit 5 includes the second shaft 51, stirring rod 52 and agitator arm 53;The framework 1
Top inner wall offers aperture, and aperture inner wall is screwed with thread groove;Second shaft 51 is vertically arranged, and is pierced by frame by aperture
Body 1 is outer to be driven between 12 shaft of motor by the rope made of hemp, and motor 12 can be such that the second shaft 51 rotates forward;Second shaft, 51 surface
Screw thread is offered, screw thread is meshed with thread groove;The stirring rod 52 is fixed on 51 lower end of the second shaft, and 52 following table of stirring rod
The design of face cambered surface, prevents filter plate 4 to be destroyed;The agitator arm 53 is located at 52 top of stirring rod, and is fixedly sheathed in second
51 surface of shaft;Second shaft, 51 surface is socketed with torsional spring 54, and one end of torsional spring 54 is fixed on 1 inner wall of framework, the other end
It is fixed on 51 surface of the second shaft;When work, motor 12 is rotated forward drives the second shaft 51 to rotate forward by the rope made of hemp, passes through screw thread and spiral shell
The engagement of groove moves down the second shaft 51 while rotating forward, thus under while rotating forward agitator arm 53 and stirring rod 52
It moves, agitator arm rotating forward can be to 4 surface pectinid of filter plate, to improve the efficiency of combustion of biomass, while wind can assist to filter
Plate 4 accelerates the filter effect of filter plate 4, and can dispel the plant ash that biological surface adheres to, while stirring rod 52 rotates forward
It moves down, can contact 4 surface of filter plate, stir biomass, the plant ash of biological surface can be shot down, while protrusion can be hit
41, it assists filter plate 4 to shake, accelerates filter effect, motor 12 inverts, and the second shaft 51 can be made to invert by the effect of torsional spring 54
While move up.
As one embodiment of the present invention, the both ends of 42 lower surface of iron plate are fixed with plate conveyor 14;It is described
Plate conveyor 14 and discharge nozzle 13 are all made of elastic material and are made;14 lower end of plate conveyor is respectively fixedly connected in the two sides of discharge nozzle 13
Side;When work, iron plate 42 can drive plate conveyor 14 to shake when shaking, so that discharge nozzle 13 be driven to shake, can prevent plant ash
Adhesion plate conveyor 14 and discharge nozzle 13.
As one embodiment of the present invention, filtering is fixed between the first movement plate 21 and the second movable plate 22
Net 28;The filter screen 28 is worked out using elastic wire;The filter screen 28 is located at 23 lower section of movable plate;The filter screen
Spring 29 is fixed between 28 lower surfaces and elastic plate 31;The spring 29 is made of heat-resisting material;When work, first is moved
Movable plate 21 and the second movable plate 22 are shaken with back movement drive filter screen 28 relatively, reach lastics effect, guarantee that stalk crushes
Completely, and spring 29 and elastic plate 31 can assist the vibration of filter screen 28, improve vibration frequency, while spring 29 can promote elasticity
The elasticity of plate 31 reinforces 31 lastics effect of elastic plate, reaches mutually auxiliary facilitation.
When work, motor 12 is rotated forward, and makes first movement plate 21 and the second movable plate 22 by the engagement of screw thread and thread groove
Relative movement, while rotor plate 23 rotates, and the rotating forward of motor 12 rotates forward first rotating shaft 33 by the rope made of hemp, is drawn by fixed link 34
Dynamic elasticity plate 31 is bent elastic plate 31, and motor 12 inverts, 31 momentary recovery of elastic plate, by the biomass on 31 surface of elastic plate
It bounces, motor 12 is rotated forward drives the second shaft 51 to rotate forward by the rope made of hemp, makes the second shaft 51 by the engagement of screw thread and thread groove
It is moved down while rotating forward, so that agitator arm 53 and stirring rod 52 be made to move down while rotating forward, motor 12 is inverted, and makes first movement
22 back movement of plate 21 and the second movable plate, while rotor plate 23 inverts, first movement plate 21 moves left and right, and drives igniter 25
It moves left and right, first rotating shaft 33 inverts, and so that cam 36 is cooperated 3 extruding gasbag 37 of fixed plate, so that gas in air bag 37 be made to pass through
Solarization air cap 46 exposes, while motor 12 inverts, and the second shaft 51 can be made to move up while reversion by the effect of torsional spring 54, and first
Shaft 33, which rotates and reverse, makes the intermittent impact iron plate 42 of striking rod 43, shakes filter plate 4 by iron plate 42, iron plate 42 is shaken
When plate conveyor 14 can be driven to shake, to drive discharge nozzle 13 to shake, while first movement plate 21 and the second movable plate 22 are opposite
The shake of filter screen 28 is driven with back movement, spring 29 and elastic plate 31 can assist the vibration of filter screen 28, while spring 29 can
Promote the elasticity of elastic plate 31.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.