Plasma ignition device

Abstract

The utility model provides a plasma ignition device. The plasma ignition device comprises a shell, a plasma generator, a primary air pipe, a secondary air pipe, an ignition cavity, a combustion stabilizing cavity and a device stabilizing structure. A nozzle of the plasma generator extends into an ignition cavity in the shell, the outlet end of the ignition cavity is communicated with the stable combustion cavity, the primary air pipe is communicated with an inlet of the ignition cavity, and the secondary air pipe is communicated with the stable combustion cavity. The device stabilizing structure comprises a fixing frame, a fixing table and elastic assemblies, one end of the fixing frame is connected with the boiler, the fixing table is perpendicularly arranged on the fixing frame, a circular groove capable of being arranged on the outer surface of the shell in a sleeving mode is formed in the fixing table, and the multiple elastic assemblies are arranged on the circumference of the surface of the circular groove. The elastic assembly comprises a spring and a positioning rod, the positioning rod is sleeved with the spring, one end of the positioning rod is fixedly connected with the surface of the circular groove, and the length of the positioning rod is one third of the length of the spring without stress. And stable ignition combustion of the plasma ignition device is realized.

Description

Technical Field

[0001] The present application relates to the technical field of pulverized coal combustion, and in particular to a plasma ignition device. Background Art

[0002] In coal-fired power plants, coal is burned in boilers to generate heat for power generation. When coal-fired units are in operation, in order to improve the operating flexibility of thermal power units and reduce the waste of coal, coal-fired units need to have fast start-stop and peak-shaving capabilities so that the units can operate stably under wide load conditions. In order to meet the needs of deep peak-shaving of units, plasma ignition devices are used to assist boilers in ignition and combustion under deep peak-shaving conditions.

[0003] The plasma ignition device allows the boiler fuel to enter the furnace to ignite and burn stably. The plasma ignition device uses direct current to contact the arc under the condition of 0.01MPa air medium pressure, and obtains a DC air plasma with stable power under the control of a strong magnetic field. The plasma forms a local high temperature area with a temperature of T>5000K and a large temperature gradient in the central combustion tube of a specially designed burner. The coal powder particles are subjected to high temperature through the plasma "fire core" and are heated to 10 -3 The volatiles are released quickly within seconds, causing the coal powder particles to break and crush and regenerate volatiles, thereby burning rapidly. Its ignition mechanism relies on the high-temperature plasma jet emitted by the plasma generator to directly ignite the primary air coal powder to achieve ignition.

[0004] During ignition, the ignited coal powder burns in stages and produces flames. The detonation caused by combustion at high temperature makes it difficult for the flame at the outlet of the plasma ignition device to maintain stability for a long time, which in turn causes unstable combustion of the coal powder in the boiler, which is not conducive to stable operation under deep peak regulation of the unit. Utility Model Content

[0005] The present application provides a plasma ignition device to solve the above-mentioned problems mentioned in the background technology.

[0006] The present application provides a plasma ignition device, comprising: a shell, a plasma generator, a primary air duct, a secondary air duct, an ignition chamber, a combustion stabilization chamber and a device stabilization structure.

[0007] The nozzle of the plasma generator extends into the ignition cavity in the shell, the outlet end of the ignition cavity is connected with the combustion stabilization cavity, the primary air duct is connected with the inlet of the ignition cavity, and the secondary air duct is connected with the combustion stabilization cavity.

[0008] The device stabilizing structure includes a fixing frame, a fixing platform and an elastic component. One end of the fixing frame is connected to the boiler. The fixing platform is vertically arranged on the fixing frame. A circular groove that can be sleeved on the outer surface of the shell is opened in the fixing platform. A plurality of elastic components are arranged on the surface circumference of the circular groove. The elastic component includes a spring and a positioning rod. The spring is sleeved outside the positioning rod. One end of the positioning rod is fixedly connected to the surface of the circular groove, and the length of the positioning rod is 1 / 3 of the length of the spring when it is not under force.

[0009] Optionally, a fixing rod is connected between the outer side of the combustion stabilization chamber and the inner side of the shell.

[0010] Optionally, the inner diameter of the combustion stabilization chamber is larger than the inner diameter of the ignition chamber.

[0011] Optionally, a heater is provided in the primary air duct, and a temperature sensor is provided in the ignition chamber.

[0012] Optionally, the connection between the ignition chamber and the combustion stabilization chamber is trumpet-shaped, and the larger opening end of the trumpet-shaped portion faces the combustion stabilization chamber.

[0013] Optionally, the plasma generator is also connected to a moving unit, which includes a support frame, a slide rail, a rolling ball and a telescopic cylinder.

[0014] One end of the telescopic cylinder is connected to an end of the support frame away from the plasma generator, and the other end of the telescopic cylinder is connected to the plasma generator. The slide rail is arranged on the support frame along the telescopic direction of the telescopic cylinder. Multiple rolling balls are located in the slide rail, and one end of the telescopic cylinder connected to the plasma generator abuts against the tops of the multiple rolling balls.

[0015] Optionally, the ignition device is also connected to a controller, and the controller is respectively connected to the plasma generator, the heater, the temperature sensor and the telescopic cylinder.

[0016] The plasma ignition device provided by the present application realizes stable ignition and combustion of the plasma ignition device, and has the following beneficial effects compared with the prior art:

[0017] (1) The present application realizes stable ignition and combustion of the plasma ignition device through the above scheme. A plasma generator is provided to generate a high-temperature plasma jet, which is ignited and burned with the primary air-powder mixed fluid from the primary air duct inside the ignition chamber to realize primary ignition. The flame moves into the stable combustion chamber and continues to mix with the secondary air-powder mixed fluid from the secondary air duct to realize secondary ignition, and the flame is more stable. The plasma ignition device is buffered and stabilized during ignition and combustion by providing a stable structure. When the shell near the outlet end of the flame produces a violent detonation and shaking at high temperature, the circular groove and the spring can limit and buffer the outlet end of the shell, greatly reducing the shaking amplitude of the outlet end of the shell, thereby making the flame more stable and the coal powder more stable when burning in the boiler. This is conducive to the stable operation of the boiler unit when participating in deep peak regulation, which not only saves the amount of coal used, but also improves the combustion efficiency of the boiler.

[0018] (2) A heater is installed in the primary air duct and a temperature sensor is installed in the ignition chamber. Before the plasma generator emits a high-temperature plasma jet, air is blown in through the primary air duct and heated by the heater to form hot air, which preheats the air in the ignition chamber and makes the coal powder easier to ignite. This avoids the situation where the plasma igniter fails to ignite when the temperature in the ignition chamber is too low.

[0019] (3) The plasma generator is moved by providing a moving unit, so that the plasma generator enters the shell when in use and exits the shell after use. The support frame is used to support the moving unit. The plasma generator is driven to move by the telescopic action of the telescopic cylinder to achieve movement of the plasma generator. The slide rail is used to support one end of the telescopic cylinder connected to the plasma generator and to enable the telescopic cylinder to move on the slide rail. A plurality of rolling balls are provided in the slide rail to reduce the friction between the output end of the telescopic cylinder and the slide rail, so that the telescopic movement of the telescopic cylinder is smoother and more stable, and power consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a plasma ignition device provided in one embodiment of the present application;

[0022] Figure 2 A schematic diagram of a stable structure provided in one embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a device provided in another embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of a mobile unit provided in one embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of a mobile unit provided in another embodiment of the present application;

[0026] Figure 6 A connection diagram of a controller provided in one embodiment of the present application;

[0027] Description of reference numerals:

[0028] 1: shell, 2: plasma generator, 3: primary air duct, 4: secondary air duct, 5: ignition chamber, 6: stable combustion chamber, 9: controller, 310: heater, 320: temperature sensor, 510: fixing rod, 710: fixing frame, 720: fixing table, 721: circular groove, 730: spring, 731: positioning rod, 810: supporting frame, 820: sliding rail, 30: rolling ball, 840: telescopic cylinder. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0030] like Figure 1 and Figure 2 As shown, the present application provides a plasma ignition device, including: a shell 1, a plasma generator 2, a primary air duct 3, a secondary air duct 4, an ignition chamber 5, a stabilizing chamber 6 and a stabilizing structure.

[0031] The nozzle of the plasma generator 2 extends into the ignition chamber 5 in the shell 1 , the outlet end of the ignition chamber 5 is connected to the combustion stabilization chamber 6 , the primary air duct 3 is connected to the inlet of the ignition chamber 5 , and the secondary air duct 4 is connected to the combustion stabilization chamber 6 .

[0032] The stable structure includes a fixing frame 710, a fixing platform 720 and an elastic component. One end of the fixing frame 710 is connected to the boiler. The fixing platform 720 is vertically arranged on the fixing frame 710. A circular groove 721 capable of being sleeved on the outer surface of the shell 1 is provided in the fixing platform 720. A plurality of elastic components are arranged on the surface circumference of the circular groove 721. The elastic component includes a spring 730 and a positioning rod 731. The spring 730 is sleeved outside the positioning rod 731. One end of the positioning rod 731 is fixedly connected to the surface of the circular groove 721, and the length of the positioning rod 731 is 1 / 3 of the length of the spring 730 when it is not under force.

[0033] Specifically, the plasma generator 2 is used to generate a high-temperature plasma jet, the primary air duct 3 is used to input the primary air-powder mixed fluid of the primary air and coal powder into the ignition chamber 5, and the nozzle of the plasma generator 2 extends into the ignition chamber 5 in the shell 1, so that the primary air-powder mixed fluid in the primary air duct 3 ignites and burns under the action of the high-temperature plasma, and the first-level ignition is achieved in the ignition chamber 5. The secondary air duct 4 is used to pass the secondary air-powder mixed fluid into the stable combustion chamber 6. After the flame of the first-level ignition in the ignition chamber 5 moves to the stable combustion chamber 6, the secondary ignition is achieved with the secondary air-powder mixed fluid, and the flame is more stable. The flame is finally output from the outlet end of the stable combustion chamber 6 to the furnace. The outlet end of the stable combustion chamber 6 is located inside the outlet end of the shell 1.

[0034] When ignition is achieved, the flame is ejected from the outlet end of the stable combustion chamber 6. Since the flame temperature is high and has a certain pressure and speed, the outlet end of the shell 1 close to the flame will produce detonation at high temperature, which will cause violent shaking, resulting in flame instability. The stabilizing structure is used to buffer and stabilize the plasma ignition device during ignition and combustion. The stabilizing structure includes a fixed frame 710, a fixed platform 720 and an elastic component. One end of the fixed frame 710 is connected to the boiler so that the fixed frame 710 is stabilized. The fixed platform 720 is vertically arranged on the fixed frame 710, and a circular groove 721 that can be sleeved on the outer surface of the shell 1 is opened in the fixed platform 720. The circular groove 721 can fix the shell 1 and reduce the shaking of the end of the shell 1. At the same time, the surface circumference of the circular groove 721 is provided with a spring 730 and a positioning rod 731. The spring 730 is arranged between the outer surface of the shell 1 and the inner surface of the circular groove 721. The spring 730 has a certain elastic deformation. When the shell 1 is close to the flame outlet and violently shakes at high temperature, the circular groove 721 and the spring 730 can limit and buffer the outlet of the shell 1, greatly reducing the shaking amplitude of the outlet of the shell 1, thereby making the flame more stable, and the coal powder is more stable when burning in the boiler, which is conducive to the stable operation of the boiler unit when participating in deep peak regulation, not only saving the amount of coal, but also improving the combustion efficiency of the boiler. At the same time, the spring 730 has a certain tension to keep the stability of the shell 1 in real time.

[0035] The positioning rod 731 has a directional effect on the direction of the spring 730, preventing the spring 730 from shaking sideways when it is extended and retracted. At the same time, the length of the positioning rod 731 is 1 / 3 of the length of the spring 730 when it is not stressed, which reserves enough length for the elastic deformation of the spring, fully exerts the buffering effect of the spring 730, and prevents the housing 1 from colliding with the positioning rod 731 when the spring 730 is compressed.

[0036] The present application realizes the stable ignition and combustion of the plasma ignition device through the above scheme. The plasma generator is set to generate a high-temperature plasma jet, and the primary air-powder mixed fluid from the primary air duct is ignited and burned inside the ignition chamber to realize the first-level ignition. The flame moves to the stable combustion chamber and continues to mix with the secondary air-powder mixed fluid from the secondary air duct to realize the second-level ignition, and the flame is more stable. The plasma ignition device is buffered and stabilized during ignition and combustion by setting a stable structure. When the shell near the outlet end of the flame produces a violent detonation shake at high temperature, the circular groove and the spring can limit and buffer the outlet end of the shell, greatly reducing the shaking amplitude of the shell outlet end, thereby making the flame more stable, and the coal powder is more stable when burning in the boiler, which is conducive to the stable operation of the boiler unit when participating in deep peak regulation, which not only saves the amount of coal, but also improves the combustion efficiency of the boiler.

[0037] like Figure 2 As shown, optionally, a fixing rod 510 is connected between the outer side of the combustion stabilization chamber 6 and the inner side of the shell 1 .

[0038] Specifically, the fixing rod 510 is used to connect the outer side of the combustion stabilization chamber 6 with the inner side of the shell 1, which is beneficial to the stability of the combustion stabilization chamber 6, reduces the impact of the high-temperature flame on the combustion stabilization chamber 6, and reduces the shaking amplitude of the combustion stabilization chamber 6.

[0039] Optionally, the inner diameter of the combustion stabilization chamber 6 is larger than the inner diameter of the ignition chamber 5 .

[0040] Specifically, this arrangement widens the passage of the flame and the air-powder mixed fluid from the ignition chamber 5 when they enter the combustion stabilization chamber 6, thereby reducing the flow rate of the flame and the air-powder mixed fluid, thereby making the flame in the combustion stabilization chamber 6 more stable.

[0041] like Figure 3 As shown, optionally, a heater 310 is provided in the primary air duct 3 , and a temperature sensor 320 is provided in the ignition chamber 5 .

[0042] Specifically, the heater 310 is used to blow air through the primary air duct 3 before the plasma generator 2 emits a high-temperature plasma jet, and the air is heated by the heater 310 to form hot air. The hot air enters the ignition chamber 5 through the primary air duct 3, so that the temperature in the ignition chamber 5 increases. The temperature sensor 320 is used to detect the air temperature in the ignition chamber 5. When the temperature rises to a first preset value, a primary air-powder mixed fluid is input through the primary air duct 3, and the plasma generator 2 is turned on to emit a high-temperature plasma jet for ignition. The ignition chamber 5 is heated by the heater 310, and the air in the ignition chamber 5 is preheated, so that the coal powder is easier to ignite. This avoids the situation where the plasma generator 2 fails to ignite when the temperature in the ignition chamber 5 is too low.

[0043] like Figure 3 As shown, optionally, the connection between the ignition chamber 5 and the combustion stabilization chamber 6 is trumpet-shaped, and the larger opening end of the trumpet-shaped part faces the combustion stabilization chamber 6 .

[0044] Specifically, after the primary ignition is achieved in the ignition chamber 5, the flame and the air-powder mixed fluid move into the combustion stabilization chamber 6 to achieve the secondary ignition. The connection between the ignition chamber 5 and the combustion stabilization chamber 6 is trumpet-shaped, which is conducive to the smoother passage of the flame and the air-powder mixed fluid during movement, reduces the resistance during movement, and is conducive to the stability of the flame.

[0045] like Figure 3-Figure 5 As shown, optionally, the plasma generator 2 is further connected to a moving unit, and the moving unit includes a support frame 810, a slide rail 820, a rolling ball 830 and a telescopic cylinder 840.

[0046] One end of the telescopic cylinder 840 is connected to the end of the support frame 810 away from the plasma generator 2, and the other end of the telescopic cylinder 840 is connected to the plasma generator 2. The slide rail 820 is arranged on the support frame 810 along the telescopic direction of the telescopic cylinder 840. Multiple rolling balls 830 are located in the slide rail 820, and the end of the telescopic cylinder 840 connected to the plasma generator 2 abuts against the tops of the multiple rolling balls 830.

[0047] Specifically, the moving unit is used to move the plasma generator 2, so that the plasma generator 2 enters the housing 1 when in use, and exits from the housing 1 after use. The support frame 810 is used to support the moving unit. The plasma generator 2 is driven to move by the telescopic action of the telescopic cylinder 840, thereby realizing the movement of the plasma generator 2. The slide rail 820 is used to support one end of the telescopic cylinder 840 connected to the plasma generator 2, and to enable the telescopic cylinder 840 to move on the slide rail 820. A plurality of rolling balls 830 are located in the slide rail 820, and are used to reduce the friction between the output end of the telescopic cylinder 840 and the slide rail 820, so that the telescopic movement of the telescopic cylinder 840 is smoother and reduces power consumption.

[0048] When the plasma generator 2 needs to be used, the telescopic cylinder 840 is opened to extend, and the output end of the telescopic cylinder 840 slides on the multiple rolling balls 830 in the slide rail 820, driving the plasma generator 2 to move toward the ignition chamber 5 to ignite the boiler. When the temperature signal value of the temperature sensor 320 is equal to the second preset temperature value, the ignition is completed. When the plasma generator 2 needs to be withdrawn from the housing 1, the telescopic cylinder 840 is shortened, and the output end of the telescopic cylinder 840 slides on the multiple rolling balls 830 in the slide rail 820, driving the plasma generator 2 to move away from the ignition chamber 5 to withdraw the plasma generator 2. To avoid the plasma generator 2 being in the boiler for a long time and receiving high temperature radiation, which causes damage to the plasma generator 2, the setting of the mobile unit prolongs the service life of the plasma generator 2.

[0049] like Figure 6 As shown, optionally, the ignition device is also connected to a controller 9, and the controller 9 is respectively connected to the plasma generator 2, the heater 310, the temperature sensor 320 and the telescopic cylinder 840.

[0050] Specifically, the controller 9 is used to determine whether to open or close the heater 310 and the plasma generator 2 based on the temperature signal received from the temperature sensor 320 , and to control the telescopic movement of the telescopic cylinder 840 to move the plasma generator 2 into or out of the housing 1 .

[0051] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0052] The plasma ignition device in this embodiment has the following operation flow during specific operation:

[0053] The controller 9 turns on the heater 310, and at the same time blows air into the ignition chamber 5 through the primary air duct 3, and heats the air through the heater 310 to form hot air, which enters the ignition chamber 5 through the primary air duct 3, so that the temperature in the ignition chamber 5 increases. The controller 9 receives the temperature signal from the temperature sensor 320 in real time. When the temperature signal value from the temperature sensor 320 received by the controller 9 is equal to the first preset temperature value, the plasma generator 2 needs to be used for ignition, and the primary air-powder mixed fluid is introduced into the primary air duct 3, and the secondary air-powder mixed fluid is introduced into the secondary air duct 4. The controller 9 turns on the telescopic cylinder 840 to extend, and the output end of the telescopic cylinder 840 slides on the multiple rolling balls 830 in the slide rail 820, driving the plasma generator 2 to move toward the ignition chamber 5. When the nozzle of the plasma generator 2 extends into the ignition chamber 5 in the housing 1, the controller 9 turns off the heater 310 and turns on the plasma generator 2 to generate a high-temperature plasma jet, so that the high-temperature plasma jet ignites the coal powder in the secondary air-powder mixed fluid. When the temperature signal value received by the controller 9 from the temperature sensor 320 is equal to the second preset temperature value, the ignition is completed. The controller 9 turns off the plasma generator 2 and controls the telescopic cylinder 840 to shorten. The output end of the telescopic cylinder 840 slides on the multiple rolling balls 830 in the slide rail 820, driving the plasma generator 2 to move away from the ignition chamber 5, so as to achieve the withdrawal of the plasma generator 2.

[0054] Ignition process: The plasma generator 2 generates a high-temperature plasma jet, and the primary air duct 3 inputs the primary air and coal powder mixed fluid into the ignition chamber 5. The nozzle of the plasma generator 2 extends into the ignition chamber 5 in the shell 1, so that the coal powder in the primary air powder mixed fluid of the primary air duct 3 ignites and burns under the action of high-temperature plasma, and the first-level ignition is achieved in the ignition chamber 5. The secondary air duct 4 introduces the secondary air powder mixed fluid into the stable combustion chamber 6. After the flame of the first-level ignition in the ignition chamber 5 moves to the stable combustion chamber 6, it realizes the second-level ignition with the secondary air powder mixed fluid, and the flame is more stable. The flame is finally output from the outlet of the stable combustion chamber 6 to the furnace, and the shaking of the outlet of the shell 1 is limited and buffered by the stabilizing structure, which greatly reduces the shaking amplitude of the outlet of the shell 1.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A plasma ignition device, characterized in that: include: A housing (1), a plasma generator (2), a primary air duct (3), a secondary air duct (4), an ignition chamber (5), a combustion stabilization chamber (6) and a device stabilization structure; The nozzle of the plasma generator (2) extends into the interior of the ignition chamber (5) in the shell (1); the outlet end of the ignition chamber (5) is connected to the combustion stabilization chamber (6); the primary air duct (3) is connected to the inlet end of the ignition chamber (5); and the secondary air duct (4) is connected to the combustion stabilization chamber (6); The stabilizing structure of the device comprises a fixing frame (710), a fixing platform (720) and an elastic component. One end of the fixing frame (710) is connected to the boiler. The fixing platform (720) is vertically arranged on the fixing frame (710). A circular groove (721) capable of being sleeved on the outer surface of the shell (1) is provided in the fixing platform (720). A plurality of elastic components are arranged on the circumference of the surface of the circular groove (721). The elastic component comprises a spring (730) and a positioning rod (731). The spring (730) is sleeved outside the positioning rod (731). One end of the positioning rod (731) is fixedly connected to the surface of the circular groove (721), and the length of the positioning rod (731) is 1 / 3 of the length of the spring (730) when it is not subjected to force.

2. The plasma ignition device according to claim 1, characterized in that: The outer side of the combustion stabilization chamber (6) and the inner side of the shell (1) are connected with a fixing rod (510).

3. The plasma ignition device according to claim 1, characterized in that: The inner diameter of the combustion stabilization chamber (6) is greater than the inner diameter of the ignition chamber (5).

4. The plasma ignition device according to any one of claims 1 to 3, characterized in that: A heater (310) is provided in the primary air duct (3), and a temperature sensor (320) is provided in the ignition chamber (5).

5. The plasma ignition device according to claim 4, characterized in that: The connection between the ignition chamber (5) and the combustion stabilization chamber (6) is in a trumpet shape, and the larger opening end of the trumpet shape faces the combustion stabilization chamber (6).

6. The plasma ignition device according to claim 5, characterized in that: The plasma generator (2) is also connected to a moving unit, which includes a support frame (810), a slide rail (820), a rolling ball (830) and a telescopic cylinder (840); One end of the telescopic cylinder (840) is connected to an end of the support frame (810) away from the plasma generator (2), and the other end of the telescopic cylinder (840) is connected to the plasma generator (2). The slide rail (820) is arranged on the support frame (810) along the telescopic direction of the telescopic cylinder (840), and the plurality of rolling balls (830) are located in the slide rail (820), and the end of the telescopic cylinder (840) connected to the plasma generator (2) abuts against the tops of the plurality of rolling balls (830).

7. The plasma ignition device according to claim 6, characterized in that: The ignition device is also connected to a controller (9), and the controller (9) is respectively connected to the plasma generator (2), the heater (310), the temperature sensor (320) and the telescopic cylinder (840).

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