CN112066372A - Spray gun and double-chamber kiln - Google Patents

Abstract

The application provides a spray gun and two thorax kilns belongs to two thorax kilns technical field. The spray gun comprises a spray gun box, a spray gun tube and a compensating tube. The spray gun box is provided with a cover plate, and the cover plate is provided with a mounting hole. The spray gun pipe has first end and second end, and the mounting hole is located to first end insertion, and the gap between the outer wall of first end and the apron has set up the sealed seat of packing that has the packing, and the second end is located the spray gun case outside. The compensating pipe is sleeved outside the second end, a gap is formed between the compensating pipe and the outer wall of the second end, and a sealing cavity is formed between the outer wall of the second end, the inner wall of the compensating pipe and the sealing filler seat. The double-chamber kiln comprises a kiln shell and a plurality of the spray guns, wherein the kiln shell is internally provided with a kiln chamber, and the spray gun box is arranged on the inner wall of the kiln shell and communicated with the kiln chamber. The spray gun is provided with the compensating pipe, so that air leakage between the spray gun pipe and the spray gun box can be avoided.

Description

Spray gun and double-chamber kiln

Technical Field

The application relates to the technical field of double-hearth kilns, in particular to a spray gun and a double-hearth kiln.

Background

The double-hearth kiln is an industrial kiln with the characteristics of heat accumulation and concurrent flow, and the fuel mainly comprises gas, solid and liquid. The double-chamber kiln consists of two chambers, each chamber is commonly provided with 33 spray guns, one kiln has 66 spray guns, and the spray guns of the double-chamber kiln using gas as fuel have the following functions: during combustion, coal gas is sprayed into the kiln, and the coal gas and the combustion-supporting air pressed by the empty top are mixed and then combusted to generate heat required for calcining limestone so as to decompose the limestone. The double-chamber kiln belongs to positive pressure operation, the kiln pressure is about 30kPa, so the sealing performance of the spray gun is required to be good.

The spray gun of the double-chamber kiln extends into the kiln from the outside of the kiln and is supported and protected by the spray gun box, in order to realize the sealing between the spray gun tube and the spray gun box, the sealing packing seat on the cover plate of the spray gun box is usually filled with the sealing packing (such as graphite packing), and the spray gun tube is tightly pressed by the graphite packing for sealing.

Because the working temperature in the kiln chamber is higher, the graphite packing can leak air at the contact position of the graphite packing and the outer wall of the spray gun tube after being used for 35 days.

Disclosure of Invention

The application aims to provide a spray gun and a double-chamber kiln, which can improve air leakage of a sealing filler after long-term use.

In a first aspect, the present application provides a spray gun comprising a spray gun housing, a spray gun tube, and a compensator tube. The spray gun box is provided with a cover plate, and the cover plate is provided with a mounting hole. The spray gun pipe has first end and second end, and the mounting hole is located to first end insertion, and the gap between the outer wall of first end and the apron has set up the sealed seat of packing that has the packing, and the second end is located the spray gun case outside. The compensating pipe is sleeved outside the second end, a gap is formed between the compensating pipe and the outer wall of the second end, and a sealing cavity is formed between the outer wall of the second end, the inner wall of the compensating pipe and the sealing filler seat.

The inventor researches and discovers that the temperature of the tube wall of the gun tube is higher due to the higher working temperature in the kiln chamber, and the higher temperature can damage the sealing filler after the sealing filler is used for a long time, so that the phenomenon of air leakage is generated at the contact position of the sealing filler and the outer wall of the gun tube. Therefore, in this application, establish the compensating pipe at the outer wall cover of spray gun pipe, form sealed chamber jointly between the inner wall of the outer wall of second end and compensating pipe and the sealing filler seat, when the air leakage after the long-time use of sealing filler, the gas that air leakage department spilt enters into sealed intracavity to after leaking gas a period, the pressure in the sealed intracavity is unanimous with the pressure of spray gun incasement, no longer lasts air leakage, can improve the air leakage problem between spray gun pipe and the spray gun case.

In a possible embodiment, the compensating pipe comprises a first horizontal section, a corrugated section and a second horizontal section which are connected in sequence, the first horizontal section and the second horizontal section are sleeved outside the second end at intervals, the first horizontal section is connected with the first end and the sealing packing seat in a sealing mode, the second horizontal section is connected with the second end in a sealing mode, and a protruding structure of the corrugated section protrudes outwards from the first horizontal section and the second horizontal section.

The two ends of the compensating pipe are horizontal sections, and are easily connected with the first end and the second end of the spray gun pipe in a sealing way; when the compensating pipe is heated and expands with heat and contract with cold, the middle ripple section has certain change to the length of compensating pipe to can make the length of compensating pipe have a small amount of changes, form sealed between easier and spray gun pipe and the sealing filler.

In one possible embodiment, the material of the compensating pipe is stainless steel, the length ratio of the first horizontal section, the corrugated section and the second horizontal section is (0.8-1.2): 1, (0.8-1.2), and the ratio of the protruding height of the corrugated section to the length of the corrugated section is (0.2-0.4): 1.

The compensating pipe is made of stainless steel, has high strength, is not easy to deform and is easy to be connected in a sealing manner. The size of the compensating pipe is in the range, the thermal deformation of the compensating pipe can be controlled, and the sealed cavity can be airtight regardless of whether the compensating pipe bears high temperature.

In a possible embodiment, the compensating pipe further comprises a first connecting ring and a second connecting ring, the first connecting ring is connected with one end of the first horizontal section far away from the corrugated section, and the first connecting ring is in sealing connection with the sealing packing seat; the second connecting ring is connected with one end of the second horizontal section far away from the corrugated section, and the second connecting ring is connected with the second end in a sealing mode.

Through the arrangement of the connecting ring, the compensation pipe, the spray gun pipe and the sealing packing seat are conveniently in sealing connection. Simultaneously, because the effect of go-between, realize sealed in go-between department, have certain distance between the sealed department that the go-between corresponds and the outer wall of spray gun pipe, can avoid the destruction of high temperature to sealed department to a certain extent, sealed effect is better.

In a possible embodiment, the sealing filler seat is arranged on the wall of the mounting hole, so that the sealing filler seat and the outer wall of the first end form an annular groove, the sealing filler is filled in the annular groove, and the first connecting ring is connected with the sealing filler seat in a sealing manner.

After the sealing filler is filled, the place where the damage of the sealing filler causes air leakage is the position where the sealing filler is contacted with the spray gun pipe, air leakage cannot occur between the sealing filler and the sealing filler seat, and after the compensation pipe is added, the air leaked from the air leakage position can enter the sealing cavity to avoid leakage to the external space. Simultaneously, have certain distance between the outer wall of the sealed department of first connecting ring and seal packing seat and spray gun pipe, can avoid the destruction of high temperature to sealed department to a certain extent, sealed effect is better.

In a possible embodiment, the first connecting ring comprises a connecting sub-ring and an annular fixing sleeve, the fixing sleeve is arranged on the surface of the connecting sub-ring close to the sealing packing seat, an annular first sealing element is arranged between the fixing sleeve and the sealing packing seat, and the first fixing element sequentially penetrates through the connecting sub-ring and the sealing packing seat. The sealing effect between the first connecting ring and the sealing packing seat can be better. And the annular first sealing member does not directly contact with the outer wall of the lance tube, and the sealing effect can be maintained for a long time.

In a possible embodiment, the first fixing ring is screwed outside the second end, and an annular second sealing member is arranged between the second connecting ring and the first fixing ring. The sealing effect between the second end and the second connection ring can be made better. And the first fixing ring is matched with the second connecting ring, so that the sealing position of the second sealing piece is not in direct contact with the outer wall of the spray gun pipe, the damage to the sealing position due to long-time contact high temperature is avoided, and the sealing effect can be kept for a long time.

In one possible embodiment, the inner annular wall of the first retaining ring is spot welded to the outer wall of the second end.

The connecting strength of the first fixing ring and the second end is increased, so that the annular second sealing element can play a long-time sealing effect.

In a possible implementation mode, the spray gun further comprises a spray gun head, a second fixing ring is sleeved at a position, close to the second end, of the spray gun head, and the second fixing piece sequentially penetrates through the second fixing ring, the first fixing ring and the second connecting ring.

The connection strength between the lance head and the lance tube is higher, connection deformation between the lance head and the lance tube is avoided, and therefore the time for keeping the seal between the second end and the compensating pipe is longer.

The second aspect, the application provides a two thorax kilns, including kiln shell and a plurality of above-mentioned spray gun, have the kiln thorax in the kiln shell, the spray gun case set up in the inner wall of kiln shell and with the kiln thorax intercommunication.

The air leakage between the spray gun box and the spray gun tube can be effectively avoided, so that the air flow leaking from the sealing filler is sealed in the sealing cavity formed by the outer wall of the spray gun tube, the kiln shell and the compensation tube, the air leakage between the spray gun and the kiln shell is ensured, the maintenance intensity during air leakage treatment is reduced, the noise caused by air leakage is eliminated, the influence of air leakage on the kiln calcination process is avoided, and the function precision of the double-chamber kiln equipment is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.

FIG. 1 is a cross-sectional view of a spray gun provided in an embodiment of the present application;

FIG. 2 is a partial cross-sectional view of a spray gun provided in accordance with an embodiment of the present application;

FIG. 3 is an enlarged view taken at III in FIG. 2;

FIG. 4 is a cross-sectional view of a compensating tube according to an embodiment of the present application;

fig. 5 is an enlarged view of v in fig. 2.

Icon: 110-a spray gun box; 120-a barrel; 130-a compensation pipe; 111-a cover plate; 112-a box body; 121-a first end; 122-a second end; 1111-mounting holes; 140-sealing packing; 150-sealing the packing seat; 151-annular groove; 152-a first ring; 153-a second ring; 154-third ring; 155-a first fixture; 156-a first seal; 131-a first horizontal segment; 132-a corrugated segment; 133-a second horizontal segment; 134-a sealed cavity; 135-linker ring; 136-a fixation sleeve; 137-a second connecting ring; 160-a first retaining ring; 161-a second seal; 170-lance head; 171-a second retaining ring; 172-a second mount; 173-third seal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The application provides a double-chamber kiln, including kiln shell and a plurality of spray gun, have the kiln chamber in the kiln shell, the spray gun is fixed on the kiln shell. And external fuel gas and combustion-supporting air enter the kiln chamber through the spray gun for combustion.

The double-chamber kiln is provided with two chambers, and a plurality of spray guns are arranged on a kiln shell of each chamber. Optionally, install 20 ~ 40 spray guns on the kiln shell of every kiln thorax, this application does not do the restriction, can be according to the size of kiln thorax and the quantity of the flow adjustment spray gun of spray gun.

FIG. 1 is a cross-sectional view of a spray gun provided in an embodiment of the present application; FIG. 2 is a partial cross-sectional view of a spray gun provided in an embodiment of the present application. Referring to fig. 1 and 2, in an embodiment of the present application, a spray gun includes a spray gun housing 110, a spray gun tube 120, and a compensating tube 130. The spray gun box 110 is arranged on the inner wall of the kiln shell and is communicated with the kiln chamber. The spray gun case 110 has a cover plate 111 and a case body 112, the case body 112 is welded to the inner wall of the kiln shell, and the cover plate 111 is fixed to the outer wall of the kiln shell. The external gas and combustion-supporting air enter the lance box 110 through the lance tube 120 and then enter the kiln chamber for combustion.

Optionally, the cover plate 111 has a mounting hole 1111, the barrel 120 has a first end 121 and a second end 122, the first end 121 is inserted into the mounting hole 1111, and a sealing packing 140 is sealingly connected to a gap between the outer wall of the first end 121 and the cover plate 111. The first end 121 of the lance tube 120 is inserted into the mounting hole 1111, the port of the first end 121 enters the lance box 110, and the gas ejected from the first end 121 enters the lance box 110, and if the sealing effect between the lance tube 120 at the mounting hole 1111 and the wall of the mounting hole 1111 of the cover plate 111 is not good, the gas in the lance box 110 may leak at the mounting hole 1111.

Therefore, a packing seat 150 filled with packing 140 (the outer wall of the first end 121 of the barrel 120 and the wall of the mounting hole 1111 of the cover plate 111 are sealed by the packing seat 150) is provided at the gap between the outer wall of the first end 121 of the barrel 120 and the cover plate 111.

In order to mount the packing 140, the packing holder 150 is disposed on the wall of the mounting hole 1111, so that the packing holder 150 and the outer wall of the first end 121 form an annular groove 151, and the packing 140 is filled in the annular groove 151.

Fig. 3 is an enlarged view of fig. 2 at iii. Referring to fig. 2 and 3, in the embodiment of the present application, the packing seat 150 is a revolving structure, and includes a first ring 152, a second ring 153, and a third ring 154 connected in sequence, as shown in fig. 3, the first ring 152 is vertically disposed, the second ring 153 is horizontally disposed, the third ring 154 is vertically disposed, one end of the first ring 152 and one end of the third ring 154 are respectively connected to two ends of the second ring 153, one end of the first ring 152 far from the second ring 153 extends in a direction far from an axis of the lance tube 120, and one end of the third ring 154 far from the second ring 153 extends in a direction near an axis of the lance tube 120.

After the sealing packing seat 150 is disposed in the mounting hole 1111, the third ring 154 is disposed on a side of the cover plate 111 close to the box 112, the first ring 152 is disposed on a side of the cover plate 111 away from the box 112, and two ends of the second ring 153 are disposed on two sides of the cover plate 111 respectively. The first end 121 of the lance tube 120 passes through the hole of the packing seat 150 such that the inner wall of the second ring 153, the left surface of the third ring 154, and the outer wall of the first end 121 of the lance tube 120 together form an annular groove 151, and the packing 140 is filled in the annular groove 151, thereby achieving sealing between the lance tube 120 and the cap plate 111. In the embodiment of the present application, the sealing packing seat 150 and the cover plate 111 may be two separate components or may be an integrally formed component, which is not limited in the present application.

Optionally, the packing seal 140 is a graphite packing, and after the dual-chamber kiln is used for a long time, the graphite packing reacts at a high temperature in a high environment for a long time and is damaged to a certain extent, so that an air leakage phenomenon (air leakage occurs between the lance tube 120 and the graphite packing in the packing seal holder 150) may occur at a joint between the lance tube 120 and the cover plate 111. Since the outer wall of the second ring 153 of the packing holder 150 is fixed to the wall of the mounting hole 1111 of the cover plate 111, when the graphite packing is damaged, the air leakage is easily generated at a position where the graphite packing contacts the outer wall of the first end 121 of the lance tube 120 (a position where the graphite packing contacts the outer wall of the lance tube 120).

Therefore, the second end 122 is located outside the spray gun box 110, the compensating pipe 130 is sleeved outside the second end 122, and a gap is formed between the outer wall of the second end 122 and the inner wall of the compensating pipe 130 and the sealing packing 140, so that a sealing cavity 134 is formed between the outer wall of the second end 122 and the sealing packing 140 (the compensating pipe 130 is located outside the spray gun box 110). The leakage of gas from the leak into the capsule 134 and after a period of leakage, the pressure in the capsule 134 is the same as the pressure in the gun housing 110 and there is no longer a continuous leakage, which improves the leakage problem between the gun tube 120 and the gun housing 110.

Fig. 4 is a cross-sectional view of a compensating pipe 130 according to an embodiment of the present application. Referring to fig. 2-4, in the embodiment of the present application, the compensating pipe 130 includes a first horizontal section 131, a corrugated section 132, and a second horizontal section 133, which are sequentially connected, and the first horizontal section 131 and the second horizontal section 133 are separately sleeved outside the second end 122 (there is a gap between the outer walls of the first horizontal section 131 and the second end 122, and there is a gap between the outer walls of the second horizontal section 133 and the second end 122), so that a cavity is formed between the compensating pipe 130 and the outer wall of the second end 122 of the lance tube 120, and then a sealed cavity 134 is formed by sealing connection.

Optionally, the protruding structure of the corrugated section 132 protrudes outward from the first horizontal section 131 and the second horizontal section 133. The corrugated section 132 is arranged to allow the length of the compensating pipe 130 to change slightly when the compensating pipe 130 expands with heat and contracts with cold, so as to form a sealing connection between the lance tube 120 and the packing 140 more easily.

Referring to fig. 3, in order to achieve the sealing connection between the first horizontal section 131 and the first end 121 and the sealing packing seat 150, the compensating pipe 130 further includes a first connecting ring, the first connecting ring is connected to an end of the first horizontal section 131 far away from the corrugated section 132, and the first connecting ring is connected to the graphite packing in a sealing manner.

Optionally, the first connection ring is in sealing connection with the packing seat 150, the first connection ring is disposed opposite to the first ring 152 of the packing seat 150, in order to achieve the sealing connection between the first connection ring and the graphite packing, the first connection ring and the first ring 152 are fixedly connected, and the first fixing member 155 sequentially penetrates through the first connection ring and the first ring 152 of the packing seat 150, so as to achieve the connection between the compensating pipe 130 and the packing seat 150.

In order to make it easier to achieve a sealing connection between the first connecting ring and the packing seal holder 150, the first connecting ring comprises a connecting sub-ring 135 and an annular fixing sleeve 136, the fixing sleeve 136 is arranged on the surface of the connecting sub-ring 135 close to the packing seal holder 150, and an annular first sealing element 156 is arranged between the fixing sleeve 136 and the packing seal holder 150.

Optionally, the fixing sleeve 136 is connected to the connecting sub-ring 135, the fixing sleeve 136 may be integrally formed with the connecting sub-ring 135, and the fixing sleeve 136 and the connecting sub-ring 135 may also be two separate components connected to each other, which is not limited in this application. The connector sub-ring 135 and the securing sleeve 136 may be welded to the outer wall of the first horizontal section 131 for sealing.

The outer side (lower side in fig. 3) of the fixing sleeve 136 abuts against the left surface of the first ring 152, an annular first sealing member 156 (e.g., an asbestos gasket) is arranged between the outer side of the fixing sleeve 136 and the left surface of the first ring 152 to realize the sealing connection between the compensating pipe 130 and the sealing packing seat 150, and the inner side (upper side in fig. 3) of the fixing sleeve 136 abuts against the sealing packing 140 in the annular groove 151 to form an abutting force on the filled sealing packing 140, so that the installation of the sealing packing 140 is firmer. Optionally, the fixing sleeve 136 is spaced from the outer wall of the lance tube 120 to avoid the damage of high temperature to the sealing position, so that the sealing effect is better.

Alternatively, the connecting sub-ring 135 is a loose flange, the first fixing member 155 is a bolt, and the bolt passes through a hole of the loose flange and a hole of the first ring 152 of the packing seat 150, so as to realize the connection between the compensating pipe 130 and the packing seat 150, and the bolt is fixed by a nut, and a gasket is disposed between the nut and the loose flange, so that the installation is firmer.

Fig. 5 is an enlarged view of v in fig. 2. Referring to fig. 2-5, in order to connect the second end 122 of the lance tube 120 and the compensating tube 130, the second horizontal section 133 and the second end 122 are hermetically connected, the compensating tube 130 further includes a second connecting ring 137, the second connecting ring 137 is connected to an end of the second horizontal section 133 far away from the corrugated section 132, and the second connecting ring 137 is hermetically connected to the second end 122.

Optionally, the spray gun further comprises a first fixing ring 160, the first fixing ring 160 is screwed outside the second end 122 of the spray gun tube 120, so as to prevent air leakage at the joint of the first fixing ring 160 and the outer wall of the second end 122 of the spray gun tube 120, and an annular second sealing member 161 (e.g., an asbestos gasket) is disposed between the second connecting ring 137 and the first fixing ring 160, so as to prevent air leakage at the gap between the second connecting ring 137 and the first fixing ring 160, so as to improve the sealing effect between the second end 122 and the second connecting ring 137, thereby obtaining the sealed cavity 134.

Optionally, the inner annular wall of the first fixing ring 160 is spot welded to the outer wall of the second end 122, so that the first fixing ring 160 is more firmly connected to the outer wall of the second end 122 of the barrel 120, the threads are not loosened, and air leakage is avoided. And the first fixing ring 160 and the second connecting ring 137 are matched, so that the sealing position of the second sealing member 161 is not in direct contact with the outer wall of the lance tube 120, the damage to the sealing position due to long-time contact high temperature is avoided, and the sealing effect can be maintained for a long time.

Optionally, the first fixed ring 160 is a detachable flange provided with internal threads, the end of the second end 122 of the lance tube 120 is provided with external threads, and the detachable flange is threadedly connected with the second end 122, thereby achieving a secure connection of the detachable flange with the second end 122.

Optionally, the first fixing ring 160 is spot-welded to the outer wall of the second end 122 of the barrel 120 at four welding points (four welding points are uniformly formed along the circumference), and the spot welding can be broken, so that the first fixing ring can be detached destructively while maintaining the firm connection, and the replacement of the parts is facilitated.

With continued reference to fig. 2 and 5, the lance further includes a lance head 170, the lance head 170 being in the form of a tee pipe having two ports for the combustion gases and the combustion supporting gases, respectively, and the other port communicating with the port at the first end 121 of the lance tube 120 for the combustion gases and the combustion supporting gases to enter the lance tube 120.

A second fixing ring 171 is fitted over the lance head 170 near the second end 122 of the lance tube 120, and a second fixing member 172 passes through the second fixing ring 171, the first fixing ring 160, and the second connecting ring 137 in this order. The connection between the lance head 170 and the lance tube 120 is made stronger and the connection between the lance head 170 and the lance tube 120 is prevented from deforming, so that the seal between the second end 122 and the compensating tube 130 is maintained for a longer time.

Alternatively, the second fixing ring 171 is a fixing flange, the second fixing member 172 is a screw, the screw passes through the fixing flange, the detachable flange, and the second connection ring 137 in this order, and a nut is sleeved on the screw, and a gasket is disposed between the nut and the flange, thereby achieving a firm connection between the second fixing ring 171, the first fixing ring 160, and the second connection ring 137.

Optionally, an annular third seal 173 is provided between the second retaining ring 171 and the first retaining ring 160, enabling the sealing connection of the lance head 170 and the second end 122 of the lance tube 120 by the third seal 173 between the outer retaining ring and the retaining ring.

The sealing connection between the compensating pipe 130 and the lance tube 120 is realized through the above structure, so that the sealing cavity 134 is formed between the compensating pipe 130 and the lance tube 120, and the gas leaked from the packing seal 140 enters the sealing cavity 134 without leaking.

In the embodiment of the present application, the compensating pipe 130 is made of stainless steel, and the compensating pipe 130 has high strength, is not easily deformed, and is easily connected in a sealing manner. In other embodiments, the material of the compensating pipe 130 may also be other metal materials, and the present application is not limited thereto, and the compensating pipe 130 that has certain strength and is not easy to deform is within the protection scope of the present application.

When the compensating pipe 130 is at a high temperature, the compensating pipe 130 expands due to heat, the connecting sub-ring 135 presses the sealing packing seat 150 rightwards, and the second connecting ring 137 presses the first fixing ring 160 leftwards, so that the sealing connection between the compensating pipe 130 and the lance tube 120 can be realized; when the compensating pipe 130 is at normal temperature, the compensating pipe 130 contracts cold, the length of the compensating pipe 130 is reduced, but due to the effect of the corrugated section 132, the protruding height of the corrugated section 132 is changed, the length of the compensating pipe 130 is not changed, the connector ring 135 of the compensating pipe 130 can still be pressed rightwards to seal the packing seat 150, the second connector ring 137 is pressed leftwards to press the first fixing ring 160, and the sealing connection between the compensating pipe 130 and the gun barrel 120 can be realized.

Optionally, the length ratio of the first horizontal segment 131, the corrugated segment 132 and the second horizontal segment 133 is (0.8-1.2): 1 (0.8-1.2), and the ratio of the protruding height of the corrugated segment 132 to the length of the corrugated segment 132 is (0.2-0.4): 1. Further, the length ratio of the first horizontal segment 131, the corrugated segment 132 and the second horizontal segment 133 is 1:1:1, and the ratio of the protrusion height of the corrugated segment 132 to the length of the corrugated segment 132 is 0.3: 1. The amount of thermal deformation of the compensating pipe 130 can be controlled to make the sealed cavity 134 airtight regardless of whether the compensating pipe 130 is subjected to high temperature.

The mode that above-mentioned spray gun is installed in two thorax kilns includes: the spray gun box 110 is installed in the kiln chamber, the box body 112 is welded with the kiln shell, the cover plate 111 is positioned outside the kiln shell, the sealing filler seat 150 on the cover plate 111 and the first end 121 of the spray gun tube 120 are compressed and sealed by the sealing filler 140, the sealing filler 140 is required not to exceed the end surface of the sealing filler seat 150 after being compressed, and the sealing filler 140 does not need to be replaced after being installed. The annular first sealing member 156, the compensating tube 130 and the annular second sealing member 161 are sequentially inserted from the second end 122 to the exterior of the barrel 120 and pushed from the second end 122 toward the first end 121 of the barrel 120, and then the annular first sealing member 156 is disposed between the retaining sleeve 136 at the connection sub-ring 135 and the packing seat 150, and the connection sub-ring 135 and the first ring 152 of the packing seat 150 are fixed by the first fixing member 155. The first fixing ring 160 is in threaded connection with the second end 122 of the gun barrel 120, an annular second sealing piece 161 is arranged between the first fixing ring 160 and the second connecting ring 137, after the first fixing ring 160 is locked with the second end 122 of the gun barrel 120, the second fixing ring 171 is basically flush with the end face of the second end 122 of the gun barrel 120, 4 spot welding points are carried out at the connecting position of the two end faces, the welding points are evenly divided within 360 degrees, the welding points are lower than 5mm, and the threads between the second fixing ring 171 and the second end 122 of the gun barrel 120 can be guaranteed not to be loosened by the 4 spot welding points, so that the relative positions of the two parts are fixed. An annular third seal 173 is placed between the second fixed ring 171 on the lance head 170 and the first fixed ring 160 outside the lance tube 120, and a second fixed ring 172 passes through the second fixed ring 171, the first fixed ring 160 and the second connecting ring 137 in this order, thereby achieving a sealed connection between the compensating tube 130 and the lance tube 120 and forming the sealed chamber 134.

The beneficial effect of spray gun and two thorax kilns that this application embodiment provided includes:

(1) the compensation pipe 130 is added, so that a sealing cavity 134 is formed between the compensation pipe 130 and the lance pipe 120, and even if the sealing filler 140 leaks gas, the leaked gas also enters the sealing cavity 134, so that the connection between the lance and the kiln shell does not leak air, the maintenance intensity during air leakage treatment is reduced, the noise caused by air leakage is eliminated, the influence of air leakage on the kiln calcination process is avoided, and the function precision of the double-chamber kiln equipment is improved.

(2) Due to the arrangement of the sealing cavity 134, the sealing filler 140 does not need to be replaced, and certain damping is formed to reduce heat radiation transfer of air flow convection.

(3) The corrugated section 132 of the compensating tube 130 allows the length of the compensating tube 130 to be adjusted so that the sealing between the compensating tube 130 and the lance tube 120 is maintained at all times and the sealing chamber 134 remains sealed for a long period of time.

(4) The connection of the lance head 170 to the lance tube 120 also secures one end of the compensating tube 130, making the connection more compact.

(5) The first fixing member 155 sequentially penetrates through the connection sub ring 135 and the packing seat 150 of the compensating pipe 130, and an annular first sealing member 156 is disposed between the connection sub ring 135 and the packing seat 150, so that the one end of the compensating pipe 130 is hermetically connected to the packing seat 150. And a certain distance is arranged between the first sealing piece 156 and the outer wall of the lance tube 120, so that the damage of high temperature to the sealing part can be avoided to a certain extent, and the sealing effect is better.

(6) The sealing connection between the other end of the compensating pipe 130 and the second end 122 of the lance tube 120 is achieved by the second fixing member 172 sequentially passing through the second fixing ring 171, the first fixing ring 160 and the second connecting ring 137, and an annular second sealing member 161 disposed between the first fixing ring 160 and the second connecting ring 137; an annular third seal 173 is provided between the second retaining ring 171 and the first retaining ring 160 to provide a sealed connection between the lance head 170 and the lance tube 120 to prevent air leakage from the lance.

The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A spray gun, comprising:

the spray gun comprises a spray gun box, a spray gun body and a spray gun body, wherein the spray gun box is provided with a cover plate, and a mounting hole is formed in the cover plate;

the spray gun tube is provided with a first end and a second end, the first end is inserted into the mounting hole, a sealing filler seat filled with sealing filler is arranged in a gap between the outer wall of the first end and the cover plate, and the second end is positioned outside the spray gun box;

the compensating pipe is sleeved outside the second end, a gap is formed between the compensating pipe and the outer wall of the second end, and a sealing cavity is formed between the outer wall of the second end, the inner wall of the compensating pipe and the sealing packing seat.

2. The spray gun of claim 1 wherein said compensating tube comprises a first horizontal section, a corrugated section and a second horizontal section connected in series, said first horizontal section and said second horizontal section being spaced apart from said second end, said first horizontal section being sealingly connected to said first end and said packing seat, said second horizontal section being sealingly connected to said second end, said corrugated section having a protrusion projecting outwardly from said first horizontal section and said second horizontal section.

3. The spray gun according to claim 2, wherein the compensating pipe is made of stainless steel, the length ratio of the first horizontal section to the corrugated section to the second horizontal section is (0.8-1.2): 1, (0.8-1.2), and the ratio of the protruding height of the corrugated section to the length of the corrugated section is (0.2-0.4): 1.

4. The lance defined in claim 2 or claim 3 wherein the compensation tube further includes a first connecting ring connected to an end of the first horizontal section remote from the corrugated section and a second connecting ring sealingly connected to the seal packing seat; the second connecting ring is connected with one end of the second horizontal section far away from the corrugated section, and the second connecting ring is connected with the second end in a sealing mode.

5. The spray gun of claim 4, wherein the sealing packing seat is disposed on a wall of the mounting hole such that the sealing packing seat and an outer wall of the first end form an annular groove, the sealing packing is filled in the annular groove, and the first connecting ring is in sealing connection with the sealing packing seat.

6. The lance defined in claim 5 wherein the first connector ring includes a connector sub-ring and an annular retainer sleeve disposed on a surface of the connector sub-ring adjacent the packing seat with an annular first seal disposed therebetween, the first fastener passing through the connector sub-ring and the packing seat in sequence.

7. The spray gun of claim 4 further comprising a first retaining ring threadably connected outside said second end, an annular second seal being disposed between said second connecting ring and said first retaining ring.

8. The spray gun of claim 7 wherein said inner annular wall of said first retaining ring is spot welded to said outer wall of said second end.

9. The lance defined in claim 7 further comprises a lance head, a second retaining ring is sleeved on the lance head adjacent the second end, and a second fixing member passes through the second retaining ring, the first retaining ring and the second connecting ring in sequence.

10. A double-chamber kiln, characterized in that, comprises a kiln shell and a plurality of spray guns as claimed in any one of claims 1-9, wherein the kiln shell is internally provided with a kiln chamber, and a spray gun box is arranged on the inner wall of the kiln shell and is communicated with the kiln chamber.

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