CN2890378Y

CN2890378Y - Air inlet and fuel feeding device for gas engine

Info

Publication number: CN2890378Y
Application number: CNU2005200879941U
Authority: CN
Inventors: 张嗣钊
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-19
Filing date: 2005-10-19
Publication date: 2007-04-18
Anticipated expiration: 2015-10-19

Abstract

An air inlet and fuel feeding device for gas engine, which comprises a supercharger, a charge air cooler, a regulating valve, a equalizing pipe, a gas main, a controller, a distributor, a branch pipe, a governor and an intake manifold; the air inlet of the controller is connected with the charge air cooler of the supercharger; the air outlet of the controller is connected with the inlet collector; the gas inlet of the controller is connected with the governor; the gas outlet of the controller is connected with the inlet of the distributor; the outlet of the distributor is connected with the intake manifold in each cylinder through the branch pipe; the controller is connected with the governor driving axis; the air distribution panel cover of the distributor is fixed on the main body of the engine, the air distribution panel is connected with the transmission structure of the motor or the camshaft and synchronous rotates with the camshaft; an air channel and a gas channel with the same geometry and processing precision controlled by throttle valves respectively are arranged on the controller, the number of two kinds of channels is proportionate; the air control throttle valves and gas control throttle valves are controlled by the governor of the engine to move synchronously. The device is applicable to various gas sources, and is of smooth functioning and good comprehensive performance.

Description

The air inlet of gas engine and fuel supplying device

One, technical field

The utility model relates to the fuel supplying device of internal-combustion engine, specifically a kind of air inlet of gas engine and fuel supplying device.

Two, background technique

The air inlet of gas engine and fuel supplying device are the cores of gas engine, and its work characteristics fundamentally affects the overall performance of gas engine.

At present, the gas engine that uses on market mainly adopts following several air inlet and fuel supplying device:

1, the mixer premix is box-like, this air inlet and fuel supplying device have at home and abroad used for many years, be a kind of generally acknowledged maturation and reliable technique, as: 12V190 type gas engine, be characterized in that combustion gas and air all enter mixing in the mixer, the mixed gas of the basicly stable air fuel ratio that is maintained enters each cylinder through motor total inlet pipe and intake manifold again.The performance of the mixer that it disposed directly influences the performance index of motor.It is at present domestic that what generally use is the diaphragm type mixer.The advantage of this air inlet and fuel supply system is easy to be reliable, keeps the good stability of air fuel ratio; Shortcoming mainly contains 2 points: the one, can not be applicable to the combustion gas that velocity of combustion is fast, fire extend is big, and because it is premixing before the suction tude, all be full of inflammable mixture during engine operation in the whole suction tude, so big for fire extend, velocity of combustion is fast contains H ₂Or the combustion gas of CO, the tendency of its tempering and dangerous serious does not contain H so this intake method is suitable for ₂Or the higher inflammable gas of CO amount.The 2nd, even be not suitable for adopting the scheme of supercharging or adopt pressurized effect also not obvious, can not give full play to the advantage of supercharging type.Because all be full of inflammable mixture in the whole suction tude, so the valve overlap of motor can not be big, can not adopt the valve overlap of supercharging type, what still adopt is non-supercharging type valve overlap, supercharged diesel engine valve overlap as 12V190 is 128 °, and the overlapping angle of 12V190 gas engine supercharging and non pressurizedly all be ± 11 ° (22 °), if the pre-mixed gas motor also adopts big overlapping angle, just have combustible gas and directly overflow from outlet pipe when scavenging, this should be avoided.So the gas engine of supercharging still has to adopt unsupercharged valve overlap, cause arranging the temperature height, power is little, and the thermal efficiency is low.

2, divide regularly air intake type of cylinder, the structure of this intake method is that a gas valve is arranged near every cylinder, be generally the bacterium valve, the switching of gas valve is directly controlled (as U.S. COOPER12SGT type gas engine) or is controlled (patent: use the internal-combustion engine of gaseous fuel, ZL90200483.2) by the hydraulic jack of combustion gas camshaft actuated by the combustion gas camshaft.The switching that is characterized in gas valve is constantly opened Zao pass than the switching of intake valve is constantly late, can prevent that inflammable gas from directly escaping into outlet pipe when scavenging, and the suction tude tempering.This intake method can better be brought into play the advantage of supercharging type, mainly is fit to contain H ₂Or the higher combustion gas of CO amount, as coking gas.Its shortcoming is the measure that lacks effective control air fuel ratio, use fire extend is big, velocity of combustion is fast coking gas fashion can, and do not contain H using ₂Or when the combustion gas of CO such as rock gas, biogas etc., or starting difficulty, or can only use by constant load; If load one becomes, air fuel ratio changes greatly, is prone to catch fire, tempering, running such as blow out unusually.

Three, summary of the invention

The purpose of this utility model provides a kind of air inlet and fuel supplying device of new gas engine, overcomes the defective of above-mentioned prior art.This device is achieved through the following technical solutions:

The utility model comprises pressurized machine, intercooler, gas pressure regulating valve, balance tube, A/F ratio controller front and back combustion gas house steward, A/F ratio controller, gas distributor, combustion gas arm, engine governor, intake manifold; The air inlet that it is characterized in that A/F ratio controller is connected with the intercooler of pressurized machine; The air outlet slit of A/F ratio controller is connected with engine intake manifold; The fuel gas inlet of A/F ratio controller is connected with gas pressure regulator, governor; The gas outlet of A/F ratio controller is connected with the gas distributor inlet; The gas distributor outlet is connected with the intake manifold of every cylinder by the combustion gas arm; A/F ratio controller is connected with the engine governor live axle; The distribution disk cover of gas distributor is fixed on the engine main body, and the drive mechanism of gas distribution plate and motor or camshaft are connected with camshaft and rotate synchronously; A/F ratio controller is provided with the air passageways and the blast tube of identical physical dimension, machining accuracy, and the quantity of two kinds of passages is proportional, by throttle valve control separately; The throttle valve of control air is controlled synchronization motion with the throttle valve of control combustion gas by engine governor.A/F ratio controller is installed on before the intake manifold of motor, and after the pressurized machine, its throttle valve is connected with engine governor, is subjected to the driving of engine governor; The A/F ratio controller air inlet connects intercooler, and air outlet slit taps into the gas house steward; The A/F ratio controller fuel gas inlet connects gas pressure regulator, governor, and gas outlet connects gas distributor.A/F ratio controller blast tube and air passageways become the physical dimension and all identical passage of machining accuracy of flow area according to hydromechanical principle design, can be different shapes such as circle, rectangle, ellipse, rhombus, which kind of shape no matter, to guarantee that all blast tube is all identical with shape, size, the precision of air passageways, can eliminate the adverse effect of flow coefficient like this.The air fuel ratio of air passageways and the used combustion gas of ratio value representation of the quantity of blast tube.The form of each throttle valve can adopt various ways such as butterfly valve, gate valve, cone valve, stopcock.

Can be for every kind of combustion gas according to the numerical value of its chemically correct fuel, the ratio of the air passageways of corresponding definite A/F ratio controller and the quantity of blast tube generally also needs to revise with bulkfactor and excess air coefficient.For example: for rock gas, its chemically correct fuel is about 10: 1, considers its bulkfactor and excess air coefficient, can be decided to be 16 to the air passageways number, and the blast tube number is decided to be 1, and ratio is 16: 1; For liquefied petroleum gas (LPG), its chemically correct fuel is about 26: 1, considers its bulkfactor and excess air coefficient, and the air passageways number is decided to be 29, and the blast tube number is decided to be 1, and ratio is 29: 1; For biogas, its chemically correct fuel is about 1.1: 1, considers its bulkfactor and excess air coefficient, and the air passageways number is decided to be 11, and the blast tube number is decided to be 8, and ratio is 11: 8.These ratios are also just just fixed, and more definite ratio is definite by testing.

What come out from A/F ratio controller is to have air and the combustion gas of having determined air fuel ratio substantially, do not allow the two mixing only earlier, air enters engine intake manifold, intake manifold, until the cylinder cap aspirating unit, combustion gas enters every cylinder aspirating unit respectively after then will being introduced into the timing allocation that gas distributor carries out combustion gas again, and air is just being mixed through in the process of engine intake valve with combustion gas.

A/F ratio controller can adopt the air outlet slit place to join the form of total road air control shutter, as Figure 12; Also can adopt each air passageways to join the form of a little air control shutter, i.e. the form of air control shutter along separate routes is as Figure 11.Rule of thumb first kind of the ratio of precision of second kind of form control air fuel ratio is high as can be known, but structure is than first kind of complexity, and cost is higher.No matter which kind of form all should make air passageways and blast tube physical dimension, machining accuracy identical, quantity is all proportional.Very little or near 1 combustion gas, as biogas, the blast tube number also is a plurality of for chemically correct fuel, gas valve also can adopt the form of total throttle valve or sub throttle valve.

A/F ratio controller can adopt various forms of throttle valve, for example can adopt butterfly valve,, in each air passageways He in the blast tube, a small butterfly valve be arranged all as Figure 13,14, channel cross-section shape among the figure is circular, and then the shape of small butterfly valve is to be close to circular ellipse.The all synchronous or coaxial rotation of all small butterfly valves.Can also adopt stopcock, as Figure 15,16, stopcock divides urceolus and inner core, have on the urceolus circumference and design air passageways and the blast tube that needs quantity, the circumference expansion shape of passage is rectangle or long-round-shape, and inner core is in the inner rotation of urceolus, along with the difference of rotation angle, make the air passageways that inner core opens or closes and the area change of blast tube, thus the variation of control air and gas flow.Can also adopt cone valve, as Figure 17,18, air passageways and blast tube all are circular, are provided with conical throttling valve core at its inlet or outlet port, control the size of air passageways and blast tube circulation area simultaneously along with cone poppet moves around at axial direction.Can also adopt gate valve, as Figure 19,20, air passageways and blast tube are rectangle or long-round-shape all, are provided with the size that a plane flashboard moves up and down the circulation area of controlling air passageways and blast tube simultaneously.The structural type of various valves belongs to known technology, no matter be which kind of valve, all should accomplish air and combustion gas are opened and closed simultaneously, makes each air passageways and blast tube all remain physical dimension, and shape, precision are identical, and do not allow air passageways to communicate with blast tube.

A/F ratio controller is different from mixer, and it only is applicable to that combustion gas divides the gas engine of cylinder air inlet, not at the premixed gas engine of suction tude.If the mode of A/F ratio controller with the cylinder timing air inlet in several existing minute described in the background technique combined, be that the mode that machinery or hydraulic driving gas valve regularly open and close the air inlet of branch cylinder is only established A/F ratio controller, can reach the technique effect same with the utility model.In addition, known technology jet in A/F ratio controller and the mechanical gas valve barrel is combined, have the technique effect of accurate control air fuel ratio too.

Sometimes, in order to make gas engine change amount on the diesel engine basis little, and it is less demanding to combustion gas air inlet accurate control constantly, when only needing accurately to control air fuel ratio, just can save gas distributor, keep A/F ratio controller, i.e. known technology combustion gas divides the method for salary distribution of cylinder negative pressure inlet only to establish A/F ratio controller, this is a simple scheme, and certain practicality and Economy are also arranged.

The similar of gas distributor is in the pneumatic starting dish of motor, and different is to use the characteristics difference.Gas distributor is a kind of fuel supplying device, is the combustion gas that distributes, and the air actuation dish is a kind of starting arrangement, distribution be air; Every cylinder air feed process of gas distributor is in the suction stroke of the every cylinder of motor, and every cylinder pressurized air of air actuation dish is connected the every cylinder expansion stroke of process at motor; Gas distributor also all the time at the timing fueling, guarantee the motor proper functioning, and the air actuation dish just makes engine start when gas engine is worked, it must quit work the starting back.

Gas distributor mainly is made up of gas distribution plate and distribution disk cover two-part, as Fig. 2; Combustion gas distribution disk cover is fixed on the engine main body, which is provided with the gas outlet with the cylinder number equal number of motor, and the interval angle of gas outlet is decided according to the cylinder firing interval angle of motor.For example: for the six-in-line machine, the gas outlet of combustion gas distribution disk cover is 6, at interval angle be 60 ° uniform, as Fig. 3,4; For 12 cylinder machines of v-angle, how many v-angles that also will see this type is is spent, and for example for the 12V190 h type engine h, the body v-angle is 60 °, and then the gas outlet of combustion gas distribution disk cover is 12, and angle is uniform 30 ° at interval, as Fig. 5,6; And if for the 12V135 h type engine h, the body v-angle is 75 °, then the gas outlet of combustion gas distribution disk cover is 12, and angle is 37.5 °, 22.5 °, 37.5 °, 22.5 ° at interval ..., as Fig. 7,8; For v-angle is 45 °, 90 °, 120 ° motor, in like manner analogizes.

The driving mechanism of gas distribution plate and motor or camshaft is connected and rotate synchronously, gas distribution plate is provided with annular fuel gas gas booking groove (slotted hole) and combustion gas house steward normal open, half of the corresponding crank angle of combustion gas valve timing that the angle of revolution of gas booking groove needs for design.For example: for 12V190 type supercharged engine, if the combustion gas valve timing angle that needs is 60 ° of the atdc of aspirating stroke, 40 ° after bottom dead center, crank angle is 160 °, and then the angle of revolution of combustion gas gas booking groove just is decided to be 80 °.When the combustion gas gas booking groove turns to the gas outlet that covers with gas distribution plate when being connected, combustion gas can enter the combustion gas arm of respective cylinder, supplies gas to each cylinder.

Sometimes the volume for the gas distributor that designs is littler, multicylinder engine for v-angle often adopts the middle gas distribution plate that a two sides all has the combustion gas gas booking groove that is equipped with, about the design of a distribution disk cover is respectively arranged, the gas outlet quantity that each gas distribution plate covers equals the single cylinder number of motor, its working principle with above-mentioned be identical.For example: for the 12V135 h type engine h, a combustion gas distribution disk cover is arranged respectively about can being designed to, each gas distribution plate has covered 6 uniform 60 ° of gas outlets; Combustion gas gas distribution plate two sides all has gas booking groove, and the angle of revolution of two gas booking grooves is identical, all is walk around half of angle of the song of the engine gas valve timing that needs, differs before and after two gas booking groove positions 37.5 ° (as Fig. 9,10).

Compared with the prior art the utility model has following beneficial effect:

The utility model has accomplished both effectively to control air fuel ratio, makes combustion gas divide cylinder timing air inlet to control the air inlet moment and the endurance of combustion gas again, and this is pursuing one's goal of all gas engine operation person.By A/F ratio controller the air fuel ratio of air and combustion gas is controlled effectively, makes air fuel ratio be unlikely to when engine operating condition changes, to have than great fluctuation process; Suitable air fuel ratio is provided all the time can for motor, makes motor keep technical performance index preferably.

By the timing allocation of gas distributor realization combustion gas, can make the pressurization gas motor adopt bigger valve overlap, use air scavenging, discharge combustion gas when avoiding scavenging, reduce delivery temperature, improve charging efficiency.Can use and contain H ₂Or the combustion gas of CO.The method of salary distribution of this combustion gas of gas distributor and existing camshaft gas valve formula in addition, camshaft hydraulic jack gas valve formula, branch prescription formulas such as electrically-controlled valve formula are compared, and have features simple structure, good reliability, to the little advantage of motor change amount.

By using this air inlet of the present utility model and fuel supplying device, can make gas engine can adapt to various gas sources preferably, comprise that calorific value is high, calorific value is low, fire extend is big, and fire extend is little, and velocity of combustion is fast, velocity of combustion slow or the like, as rock gas, biogas, coking gas, coal-seam gas, biogas, high furnace exhaust gas etc.; Can make the pressure-increasing machine type start easily, turn round steadily, the thermal efficiency is high, row's temperature is low, good combination property.

Four, description of drawings

Fig. 1 is installed in general arrangement structural representation on the motor for the utility model

Fig. 2 is gas distributor assembling schematic representation

Fig. 3 is 6 cylinder machine gas distributor schematic representation in upright arrangement or the single cylinder gas distributor of 12V machine schematic representation

Fig. 4 is 6 cylinder machine gas distributor gas distribution plate schematic representation in upright arrangement

Fig. 5 is 12V machine (60 ° of a body angles) gas distributor distribution disk cover schematic representation

Fig. 6 is 12V machine (60 ° of a body angles) gas distributor gas distribution plate schematic representation

Fig. 7 is 12V machine (75 ° of a body angles) gas distributor distribution disk cover schematic representation

Fig. 8 is 12V machine (75 ° of a body angles) gas distributor gas distribution plate schematic representation

Fig. 9 is the two-sided gas distributor distribution disk cover schematic representation of 12V machine (75 ° of body angles)

Figure 10 is the two-sided gas distributor gas distribution plate schematic representation of 12V machine (75 ° of body angles)

Figure 11 is the A/F ratio controller schematic representation of band shunt air control shutter

Figure 12 is the A/F ratio controller schematic representation with total road air control shutter

Figure 13 throttle valve is the A/F ratio controller schematic representation of butterfly valve

Figure 14 is the left view of Figure 13

Figure 15 throttle valve is the A/F ratio controller schematic representation of stopcock

Figure 16 is the plan view of Figure 15

Figure 17 throttle valve is the A/F ratio controller schematic representation of cone valve

Figure 18 is the left view of Figure 17

Figure 19 throttle valve is the A/F ratio controller schematic representation of gate valve

Figure 20 is the left view of Figure 19

Figure 21 air passageways and blast tube are rectangle, and throttle valve also is the A/F ratio controller assembling schematic representation of rectangle butterfly valve

Among Fig. 1: A-increases device (original) B-balance tube (original) C-intercooler (original) D-gas pressure regulator, governor (original) E, H-combustion gas house steward F-air fuel ratio control G-engine governor (original) I-intake manifold (original) J-engine intake manifold (original) K-combustion gas air intake branch L-combustion gas distributes M-cylinder head (original)

Among Fig. 2: 1-distribution disk cover 2-gas outlet joint 3-oil sealing 4-bearing 5-axle 6-lubricates hydraulic fluid port 7-fuel gas inlet joint 8-pad 9-baffle ring 10-gas distribution plate 11-key 12-connecting body

Among Fig. 7,8,9,10: III-gas outlet IV-combustion gas gas booking groove

Among Figure 11,12,13,15,17,20,21: I-air passageways II-blast tube 20-air control shutter 21-gas throttle valve

Among Figure 16: 31-urceolus 32-inner core

Among Figure 21: the long key 49-of 41-woodruff key 42-axle spacer 43-oil sealing 44-valve handle 45-axle 46-bearing cap 47-valve body 48-back-up ring 50-bearing 51-lining 52-combustion gas lid 53-air cap 54-inner spacing collar 55-guard ring

Five, embodiment

The utility model is as follows at the embodiment of 12V135 charge inter cooling type:

The former diesel engine of this type is a 12V type two row cylinder, 75 ° of v-angles, and two row's suction tude are arranged in the v-angle, and former high-pressure fuel pump of diesel engine is single 12 in-line arrangement, and the driving mechanism by the diesel engine gear end is arranged in the v-angle.

The utility model at the general arrangement of this type as shown in Figure 1, its each several part annexation is: A/F ratio controller F is two of symmetry, and symmetry is installed on two intake manifolds, is middlely driven by speed regulator G; The air inlet of A/F ratio controller F is connected with the intercooler C of pressurized machine A; The air air outlet is connected with the end face of intake manifold J; Gas inlet is connected with gas pressure regulator, governor D by combustion gas house steward E before the controller; Gas outlet is connected with gas distributor L by combustion gas house steward H behind the controller.Pressurized machine A, intercooler C, gas pressure regulator, governor D, and connection and the handling characteristics of balance tube B belong to known technology.

Gas distributor L is arranged in the position of former high-pressure fuel pump of diesel engine, distributes disk cover 1 to be fixed on the engine main body, and gas distribution plate 10 drives by the driving mechanism of axle 5 by former diesel engine; Its fuel gas inlet by controller after combustion gas house steward H meet A/F ratio controller F, its gas outlet is 12, receives every cylinder air inlet manifold I place by combustion gas arm K (12) respectively, and reaches in the aspirating unit of cylinder cap M near the suction valve always.

The structural feature of A/F ratio controller F comprises as shown in figure 13: air control shutter 20, gas throttle valve 21, woodruff key 41, axle spacer 42, oil sealing 43, valve handle 44, axle 45, bearing cap 46, valve body 47, long key 48, back-up ring 49, bearing 50, lining 51, combustion gas lid 52, air cap 53, inner spacing collar 54, guard ring 55.

Air passageways I and blast tube II cross section all are rectangle, and its size and machining accuracy are all identical, and when using natural air-air source, the ratio of its quantity is 16: 1; When using liquefied gas source, if the ratio of its quantity is 29: 1.A throttle valve is arranged in the blast tube II, a throttle valve is all respectively arranged in each air passageways; The cross section of gas throttle valve and air control shutter also is a rectangle, and the assembling back is slightly gapped with passage separately on width; All throttle valve are subjected to speed regulator to drive all coaxial or synchronous rotation.

The structure of gas distributor L comprises as shown in Figure 2: distribution disk cover 1, gas outlet joint 2, oil sealing 3, bearing 4, axle 5, lubricated hydraulic fluid port 6, fuel gas inlet joint 7 and pad 8, baffle ring 9, gas distribution plate 10, key 11, connecting body 12.

Gas distribution plate in the middle of adopting with two-sided annular gas booking groove, respectively there is the form of a distribution disk cover at two ends, as Fig. 9,10, the gas outlet III that each gas distribution plate covers be 6 uniform, two circular groove IV angles of gas distribution plate differ 37.5 °.

When installing and use gas distributor, tackle it and carry out the timing adjustment, and according to the corresponding connection gas outlet of firing order and every cylinder intake duct, as: for the 12V135 type, its firing order is generally 1-12-5-8-3-10-6-7-2-11-4-9, then 1 cylinder jiggering a certain angle before or after the air-breathing top dead center; The gas distribution plate of gas distributor also turns to annular gas booking groove and a certain outlet of distribution disk cover has just begun to connect, and then this outlet is the gas outlet of 1 cylinder, and all the other each cylinders are pressed firing order and connected.

For the gas engine of supercharging, the intercooler outer pipe be the A/F ratio controller inlet tube with gas pressure regulator, governor between be connected balance tube, make the air pressure after gas pressure regulator, governor is experienced supercharging.The characteristics of installing and using and the engine air inlet tube of pressurized machine, intercooler and gas pressure regulator, governor, the installation of engine governor and handling characteristics all belong to known technology, do not give unnecessary details at this.

For unsupercharged gas engine, there are not pressurized machine, intercooler and balance tube, the A/F ratio controller import directly communicates with barometric pressure (air-strainer), and gas pressure regulator, governor is also directly experienced atmospheric pressure; The work characteristics of A/F ratio controller and gas distributor is identical with the type of supercharging.

When gas engine only is used for fire extend than large-scale combustion speed combustion gas faster (as coking gas), if abandon high requirement to the inflammable mixture air fuel ratio, just can save A/F ratio controller, general air control shutter and gas throttle valve are only installed in position at A/F ratio controller, the characteristics of gas distributor are constant, the cost of a kind of reduced form like this is lower, have with background technique in the same function of gas engine of said existing gas valve form.

When being used for diesel oil-combustion gas duel fuel engine, because the ignition energy of diesel oil much larger than spark plug, if the air fuel ratio of mixed gas is not put forward excessive demand, also can save A/F ratio controller, replace air control shutter or gas throttle valve, the characteristics of gas distributor are constant.

Claims

1, a kind of air inlet of gas engine and fuel supplying device comprise pressurized machine, intercooler, gas pressure regulating valve, balance tube, A/F ratio controller front and back combustion gas house steward, A/F ratio controller, gas distributor, combustion gas arm, engine governor, intake manifold; The air inlet that it is characterized in that A/F ratio controller is connected with the intercooler of pressurized machine; The air outlet slit of A/F ratio controller is connected with engine intake manifold; The fuel gas inlet of A/F ratio controller is connected with gas pressure regulator, governor; The gas outlet of A/F ratio controller is connected with the gas distributor inlet; The gas distributor outlet is connected with the intake manifold of every cylinder by the combustion gas arm; A/F ratio controller is connected with the engine governor live axle; The distribution disk cover of gas distributor is fixed on the engine main body, and the drive mechanism of gas distribution plate and motor or camshaft are connected with camshaft and rotate synchronously; A/F ratio controller is provided with the air passageways and the blast tube of identical physical dimension, machining accuracy, and the quantity of two kinds of passages is proportional, by throttle valve control separately; The throttle valve of control air is controlled synchronization motion with the throttle valve of control combustion gas by engine governor.

2, the air inlet of gas engine according to claim 1 and fuel supplying device is characterized in that A/F ratio controller is provided with the air control shutter with the air passageways number, has the gas throttle valve with the blast tube number.