CN106110547B

CN106110547B - Spray head and fire-fighting lance

Info

Publication number: CN106110547B
Application number: CN201610649520.4A
Authority: CN
Inventors: 杨峰
Original assignee: Individual
Current assignee: Shanghai Huarui Rescue Equipment Co ltd
Priority date: 2016-08-10
Filing date: 2016-08-10
Publication date: 2021-08-27
Anticipated expiration: 2036-08-10
Also published as: CN106110547A

Abstract

The invention relates to the technical field of spray head structures, aims to solve the problems that the existing spray head is inconvenient to operate and is possibly damaged by water hammer impact during opening and closing, and provides a spray head which comprises a shell, a sliding part, a blocking part, an elastic part and a trigger. The sliding piece is in sliding sealing fit in the shell and is provided with a second channel. The plugging piece is fixedly arranged in the shell; a through flow port is arranged between the plugging piece and the inner surface of the shell; the elastic piece exerts an elastic force on the sliding piece, which is directed to the plugging piece; the trigger is in transmission connection with the sliding piece; the trigger has a first position and a second position; the sliding part has a first state of sealing and propping against the plugging piece and a second state of separating from the plugging piece; the trigger can drive the sliding piece to compress the elastic piece and change from the first state to the second state. The fire extinguishing device has the advantages that the fire extinguishing material can be quickly cut off, the operation is convenient, the device is not hammered by a water hammer when being opened and closed, and the use is safe. The invention also provides a fire-fighting lance.

Description

Spray head and fire-fighting lance

Technical Field

The invention relates to the technical field of spray head structures, in particular to a spray head; the invention also relates to a fire-fighting lance.

Background

A fire-fighting lance is a device for spraying fire-extinguishing substances for fire-fighting, which is generally constructed using a pipe for transporting the fire-extinguishing substances in connection with a spray head.

The fire-fighting lance in the prior art can realize the on-off of fire-fighting substances only by turning the switch ball valve, certain time is consumed, and a user needs to hold the lance body with one hand and operate the switch ball valve with the other hand when using the fire-fighting lance, so that the operation is inconvenient; and when the valve is closed or opened, the operator can be subjected to a recoil force due to the action of the water hammer, which may cause certain injuries to the operator and even more serious use accidents. These problems make the existing fire-fighting lance have the problems of inconvenient operation and possible damage caused by water hammer impact when opening and closing.

Disclosure of Invention

The invention aims to provide a spray head to solve the problems that the spray head in the prior art is inconvenient to operate and is possibly damaged by water hammer impact during opening and closing.

The invention also aims to provide the fire-fighting lance with the spray head.

The embodiment of the invention is realized by the following steps:

a spray head comprises a shell, a sliding part, a blocking part, an elastic part and a trigger. The housing has a first end, a second end, and a first passage extending through the first and second ends. The sliding piece is in sliding sealing fit with the inner circumferential surface of the first channel along the axial direction of the first channel, and the sliding piece is provided with a third end close to the first end, a fourth end close to the second end and a second channel penetrating through the third end and the fourth end. The plugging piece is arranged in the first channel and is positioned between the second end and the fourth end; the plugging piece is fixedly connected with the shell; a through flow port is arranged between the plugging piece and the inner surface of the shell; the elastic piece exerts an elastic force on the sliding piece, which is directed to the plugging piece; the trigger is in transmission connection with the sliding piece; the trigger has a first position and a second position; the sliding part has a first state of abutting against the closure piece and closing the second channel and a second state of separating from the closure piece and opening the second channel; the trigger can move from the first position to the second position, and drives the sliding piece to compress the elastic piece and change from the first state to the second state.

When the spray head in the embodiment is not used, the sliding piece is pressed on the sealing piece under the elastic force of the elastic piece to shut off the fire extinguishing substances in the first channel; when fire extinguishing substances need to be sprayed out, the trigger can be pulled to drive the sliding piece to slide in the first channel and compress the elastic piece, so that the fourth end of the sliding piece is separated from the blocking piece, and the fire extinguishing substances in the second channel can pass through a gap between the sliding piece and the blocking piece and can be sprayed out from the second end of the first channel through the through-flow port to extinguish fire; when the fire extinguishing substance needs to be turned off again, one hand does not need to be vacated to close the ball valve like a spray head in the prior art, only the trigger needs to be loosened, the sliding part can be pressed on the sealing part again under the elastic force of the elastic part, and the fire extinguishing substance is turned off in the second channel, so that the effect of rapidly turning off the fire extinguishing substance is realized, and the fire extinguishing substance has the advantages of convenience in operation and safety in use. In addition, at the in-process of opening and shutting off the fire extinguishing substance, elasticity in this embodiment can be compressed by appropriate amount, and suitable displacement can take place for the body simultaneously, and this can cushion well and alleviate the water hammer effect that the fire extinguishing substance produced when opening and shutting off, has guaranteed the security that the shower nozzle in this embodiment used.

Further:

the spray head also comprises a handle which is fixedly connected with the outer wall of the shell;

when the trigger is in the first position, the trigger is remote from the handle; when the trigger is in the second position, the trigger is proximate the handle.

Further:

the nozzle also comprises a clamping piece; the clamping piece is connected with the handle, and when the trigger is located at the second position, the trigger is clamped with the handle through the clamping piece.

Further:

the trigger comprises a connecting ring, a trigger rod and a connecting block which are connected with the connecting ring, and two hinge blocks which are connected with the connecting ring and are oppositely arranged;

the connecting ring is sleeved outside the peripheral surface of the shell; the inner surface of the connecting ring and the outer peripheral surface of the shell are mutually spaced; the connecting block is rotatably connected with the shell;

the two sides of the outer wall of the shell are respectively provided with a sliding chute extending along the axial direction of the shell;

the hinge blocks positioned at the two sides of the connecting ring are respectively connected with a connecting pin;

the connecting pin passes through the sliding groove and is rotatably connected with the sliding piece.

Further:

the shell is connected with a base, and the connecting block is rotatably connected with the shell through the base; the connecting block or the base is provided with a sliding hole and is rotatably connected through a pin shaft penetrating through the sliding hole; the cross section size of the sliding hole is larger than that of the pin shaft.

Further:

the inner side surface of the shell is fixedly connected with a supporting piece; the sliding piece is in sliding sealing fit with the shell through the supporting piece.

Further:

the supporting piece is of an annular structure, and the outer peripheral surface of the supporting piece is in sealing fit with the inner peripheral surface of the first channel; the support member has a fitting hole extending in the axial direction of the first passage, and the outer surface of the slide member is slidably and sealingly fitted in the fitting hole.

Further:

one end of the matching hole close to the first end is provided with a limiting ring which is inwards protruded along the radial direction;

the elastic piece is positioned in the matching hole and supported between the limiting ring and the sliding piece.

Further:

one side of the blocking piece close to the fourth end is provided with a blocking surface; the plugging surface is a conical surface with the diameter gradually increased from the first end to the second end; the opening of the sliding piece close to the fourth end is a conical opening matched with the plugging surface; when the sliding piece is in the first state, the conical opening is abutted against the blocking surface.

A fire-fighting lance comprising the spray head further comprises a pipeline and a connecting piece; the pipeline is connected with the first end of the shell through a connecting piece and is communicated with the second channel of the sliding piece.

In use, fire suppressant material supplied by the conduit enters the second passage of the spray head via the connection, in the manner described above.

In conclusion, the spray head in the embodiment controls the sliding part to press the blocking part or leave the blocking part respectively through the force of the trigger and the elastic force of the elastic part, so that the fire extinguishing substances are turned on and off, the spray head can be held by two hands all the time in the operation process, the ball valve for turning on and off the fire extinguishing substances does not need to be operated by the free hands, and the spray head has the advantages of capability of quickly turning off the fire extinguishing substances, convenience in operation and safety in use; in addition, in the opening and closing processes, the elastic piece can be compressed properly, and the body can move properly, so that the water hammer can be buffered and relieved, a user is protected, and the water hammer preventing device has the beneficial effect of safety in use.

The fire-fighting lance in this embodiment has above-mentioned shower nozzle, consequently also has the beneficial effect that can turn off the material of putting out a fire fast, convenient operation, safe in utilization.

Drawings

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

Fig. 1 is a schematic structural diagram of a showerhead in an off state according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;

fig. 3 is a schematic view of fig. 2 when the number of the fixing blocks is changed to two;

FIG. 4 is a schematic view of the base of FIG. 1;

FIG. 5 is a schematic view of the trigger of FIG. 1;

FIG. 6 is a view taken along line A of FIG. 5;

FIG. 7 is a schematic structural view of the sprinkler head of FIG. 1 in an open state;

fig. 8 is a schematic structural view of a fire-fighting lance according to a second embodiment of the present invention.

In the figure:

a head 010;

a fire-fighting lance 020;

a housing 100;

a first end 101, a second end 102, a first channel 103;

a chute 104;

a pin 110;

a base 120, a seat plate 121, a base plate 122;

a screw 130;

a slider 200;

a third end 201, a fourth end 202, a second channel 203;

a tapered opening 204;

a convex ring 210;

a blocking piece 300;

a flow port 301;

a plugging surface 302;

a fixing block 310;

an elastic member 400;

a trigger 500;

a connection ring 510;

a connecting block 520, a sliding hole 521;

a lever 530;

a hinge block 540;

a connecting pin 550;

a handle 600;

a snap member 610;

a raised pattern 620;

a support member 700;

a mating hole 701;

a stop collar 710;

a first support ring 720, a second support ring 730;

a pipe 800;

a connector 810;

a foam generator 910;

a filter 920;

a flow regulator 930.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Example one

Referring to fig. 1, the embodiment provides a sprayer 010, and the sprayer 010 includes a housing 100, a sliding member 200, an elastic member 400, a blocking member 300, a trigger 500, and a handle 600.

The housing 100 has a first end 101, a second end 102, and a first passage 103 extending through the first end 101 and the second end 102.

The inner side surface of the housing 100 is fixedly connected with a supporting member 700, the supporting member 700 is an annular structure, the outer peripheral surface of the supporting member 700 is in sealing fit with the inner peripheral surface of the first channel 103, and the housing 100 and the supporting member 700 can be screwed together by a screw 130. The inner circumferential surface of the support 700 encloses a cylindrical fitting hole 701. The end of the mating bore 701 adjacent the first end 101 has a radially inwardly projecting stop collar 710.

Fig. 2 is a sectional view taken along line II-II of fig. 1, which mainly shows a connection relationship between the support 700 and the case 100. Referring to fig. 1 and fig. 2, the blocking member 300 is fixedly connected to the housing 100, and the blocking member 300 is disposed in the first channel 103 and located between the second end 102 and the fourth end 202. In this embodiment, the blocking member 300 is connected to the housing 100 through the fixing block 310 by a screw 130, for example, a through hole is formed in a sidewall of the housing 100, and then the connecting screw 130 is inserted through the through hole and driven into the connecting block 520 and the blocking member 300. The closure 300 has a flow opening 301 between it and the inner surface of the housing 100. In other embodiments, two fixing blocks 310 may be provided, referring to fig. 3, the two fixing blocks 310 are symmetrically connected to both sides of the blocking member 300, so that the blocking member 300 can be uniformly and evenly stressed.

The side of the blocking piece 300 close to the fourth end 202 has a blocking surface 302; the blocking surface 302 is a conical surface having a diameter gradually increasing from the first end 101 to the second end 102.

The slider 200 has a third end 201 near the first end 101, a fourth end 202 near the second end 102, and a second channel 203 extending through the third end 201 and the fourth end 202.

In the present embodiment, the slider 200 is slidably and sealingly fitted to the inner peripheral surface of the first passage 103 via the support 700 to achieve a sliding and sealing fit between the slider 200 and the inner peripheral surface of the first passage 103 in the axial direction of the first passage 103. In other embodiments, the slider 200 may effect a sealing sliding fit of the slider 200 in the first channel 103 directly by engagement of its outer surface with the inner surface of the housing 100, thus performing the function of a sealing sliding fit without the provision of the support 700. The opening of the slider 200 near the fourth end 202 is a tapered opening 204 that mates with the blocking surface 302; when the slider 200 is in the first state, the tapered opening 204 abuts against the blocking surface 302.

The elastic element 400 is disposed in the fitting hole 701, and one end of the elastic element 400 abuts against the limiting ring 710, and the other end of the elastic element 400 is elastically supported at the third end 201 of the sliding element 200, so as to apply an elastic force to the sliding element 200, which is directed to the plugging element 300. In this embodiment, the elastic member 400 is a compression spring. Of course, in other embodiments, the elastic member 400 may also be an elastic damper or other elastic structure.

In this embodiment, the supporting member 700 may be provided in a separate form, which may be composed of a first supporting ring 720 supported at the third end 201 of the slider 200 and a second supporting ring 730 supported at the fourth end 202 of the slider 200. The first support ring 720 and the second support ring 730 are respectively screwed with the housing 100 by screws 130, and the outer circumferential surfaces of both ends of the slider 200 are respectively fitted in sliding sealing manner on the inner surface of the first support ring 720 and the inner surface of the second support ring 730. The outer circumferential surface of the slider 200 may be fixedly coupled with a protruding ring 210 protruding from the outer circumferential surface, and the protruding ring 210 is located between the first support ring 720 and the second support ring 730. In other embodiments, the supporting member 700 may be provided in a manner that an inner surface of the supporting member 700 may be provided with a guide groove extending along an axial direction thereof, and an outer surface of the sliding member 200 is fixedly connected with a stopper protruding in a radial direction; when sliding in the fitting hole 701, the sliding member 200 drives the stopper fixedly connected to the outer surface thereof to slide in the guide groove, and since the stopper is stopped by the side edge of the guide groove and cannot rotate, the sliding member 200 cannot rotate around the axis thereof in the fitting hole 701, thereby preventing circumferential rotation of the sliding member 200 and ensuring sealing engagement between the sliding member 200 and the support member 700.

The handle 600 is fixedly connected to the outer wall of the housing 100, and the handle 600 is provided to facilitate holding in use. The handle 600 is provided with a plurality of ribs 620 for increasing grip and friction.

The base 120 is connected to the housing 100, and the base 120 and the handle 600 are respectively located at two sides of the axis of the housing 100. Fig. 4 is a schematic structural diagram of the base 120 in fig. 1. Referring to fig. 4, the base 120 includes two opposite seat plates 121; a pin 110 is connected between the two opposite seat plates 121. The base 120 may further include a base plate 122, the base plate 122 is fixedly connected with the housing 100, and the two seat plates 121 are oppositely and fixedly connected to the base plate 122.

Fig. 5 is a schematic view of the trigger 500 of fig. 1, and fig. 6 is a view taken along direction a of fig. 5. Referring to fig. 5 and 6, the trigger 500 includes a connection ring 510, a lever 530 and a connection block 520 connected to the connection ring 510, and two hinge blocks 540 connected to and opposed to the connection ring 510. The connection ring 510 is sleeved outside the outer circumferential surface of the housing 100; the inner surface of the connection ring 510 is spaced apart from the outer circumferential surface of the housing 100; the connecting block 520 is rotatably connected with the housing 100. The hinge blocks 540 located at both sides of the connection ring 510 are respectively connected with the connection pins 550.

Referring to fig. 1 again, the two sides of the outer wall of the housing 100 are respectively provided with sliding slots 104 extending along the axial direction thereof, and the connecting pin 550 passes through the sliding slots 104 and is connected with the sliding member 200.

The connecting block 520 is rotatably connected with the housing 100 through the base 120; the connecting block 520 or the base 120 is provided with a sliding hole 502, and the connecting block 520 or the base 120 is rotatably connected through a pin 110 penetrating through the sliding hole 502; the cross-sectional dimension of the slip hole 502 is greater than the cross-sectional dimension of the pin 110. The sliding hole 502 in this embodiment is disposed on the connecting block 520.

The lever 530 is disposed opposite to the handle 600. The trigger 500 is in transmission connection with the slide 200; the trigger 500 has a first position and a second position. The slider 200 has a first state abutting against the closure 300 and closing the second channel 203 and a second state moving away from the closure 300 and opening the second channel 203. The trigger 500 can move from the first position to the second position, causing the sliding member 200 to compress the elastic member 400 and move from the first state to the second state. When the trigger 500 is in the first position, the trigger 500 is distal from the handle 600; when the trigger 500 is in the second position, the trigger 500 is adjacent to the handle 600 and is engaged with the handle 600 by the engagement member 610. Referring to fig. 1, the structure of the nozzle 010 is schematically illustrated when the trigger 500 is at the first position and the slider 200 is in the first state of being tightly and sealingly abutted against the closure 300, and referring to fig. 7, the structure of the nozzle 010 is schematically illustrated when the trigger 500 is at the second position and the slider 200 is in the second state of being away from the closure 300.

The showerhead 010 of this embodiment may further include a bubble generator 910, and the bubble generator 910 is connected to the second end 102 of the first passage 103. The bubble generator 910 is used to generate bubbles so that the nozzle 010 can spray the bubble-shaped fire extinguishing substance.

To control the flow rate and the ejection speed of the fire extinguishing substance, the second end 102 of the first passage 103 may be provided with a flow regulator 930.

In actual implementation of fire fighting, fire extinguishing substance (e.g. water) enters the spray head 010 from the second channel 203. Under the action of the elastic force of the elastic element 400, the opening of the fourth end 202 of the sliding element 200 is abutted against and matched with the blocking surface 302 of the blocking element 300, the fire extinguishing substance is blocked in the second channel 203, and the spray head 010 is in a closed state; when the trigger 500 needs to be opened, the pulling rod 530 of the trigger 500 can be pulled toward the handle 600, the trigger 500 rotates about the matching position of the pin shaft 110 and the sliding hole 521 as a pivot to drive the pin shaft 110 on the hinge block 540 and the sliding element 200 connected with the pin shaft 110 to move in a direction away from the blocking element 300 and compress the elastic element 400, finally the pulling rod 530 is matched in the matching groove on the handle 600, and the clamping element 610 is used for clamping the pulling rod 530, so that the pulling rod 530 is kept fixed in the matching groove. At this time, the fourth end 202 of the slider 200 is disengaged from the sealing surface, and the second passage 203 is brought into communication with the through-flow port 301, so that the fire extinguishing substance in the second passage 203 can enter the first passage 103 through the through-flow port 301 and be sprayed out from the second end 102 of the housing 100 to extinguish the fire. When need suspend the fire extinguishing, only need buckle piece 610 down, loosen being connected of handle 600 and lever 530, trigger 500 will be rotatory to the direction that makes lever 530 keep away from handle 600 under the effect of the elastic force of elastic component 400 to support fast on sealed face, realize the shutoff of the material of putting out a fire, the operation of this process need not rotate the ball valve handle hard like prior art and just can realize the shutoff, and is consuming time long, and the operation is hard.

In addition, the prior art nozzle 010 produces a water hammer effect due to the impact of the water flow when the fire extinguishing substance is turned off and on, which gives a large inertial impact to the user. In the embodiment of the nozzle 010, when the fire extinguishing material is turned off or on, the elastic member 400 is compressed properly, and the sliding member 200 moves properly, so that the impact force of the water hammer is reduced, and the water hammer or the inertial impact force is not generated to the operator. Has the advantage of safe use.

Example two

Referring to fig. 8, the present embodiment provides a fire monitor 020, where fire monitor 020 includes a nozzle 010 according to one embodiment, a conduit 800 and a connector 810.

The conduit 800 is connected to the first end 101 of the housing 100 by a connector 810, and the conduit 800 communicates with the second channel 203 of the slider 200. A filter 920 may be further provided between the connection member 810 and the first end 101 of the housing 100 for filtering the fire extinguishing substance introduced into the head 010.

The fire monitor 020 provided by the embodiment has the nozzle 010 of the first embodiment, so that the first embodiment has the beneficial effects of short time consumption for switching off the nozzle 010, convenience in operation and safety in use.

In summary, the nozzle 010 of the embodiment of the present invention controls the on/off of the fire extinguishing material by using the elastic force of the elastic member 400 to push the sliding member 200 to slide to achieve the off-state and using the trigger 500 to drive the sliding member 200 to compress the elastic member 400 so as to separate the sliding member 200 from the blocking member 300 to achieve the on-state, and has the advantages of being capable of rapidly achieving the on/off of the fire extinguishing material, convenient to operate, and safe to use; in addition, the nozzle 010 of the embodiment of the invention can buffer and reduce the water hammer phenomenon when the fire extinguishing substances are turned on and off, thereby improving the use safety of the nozzle 010.

The fire-fighting lance 020 in the embodiment of the invention has the beneficial effects of capability of quickly opening and closing fire-fighting substances, convenience in operation and safety in use due to the fact that the spray head 010 is arranged.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spray head, comprising:

a housing; the housing has a first end, a second end, and a first channel extending through the first end and the second end;

a slider; the sliding piece is in sliding and sealing fit with the inner circumferential surface of the first channel along the axial direction of the first channel, and the sliding piece is provided with a third end close to the first end, a fourth end close to the second end and a second channel penetrating through the third end and the fourth end;

a blocking member; the block is disposed in the first channel between the second end and the fourth end; the plugging piece is fixedly connected with the shell; a through flow port is formed between the plugging piece and the inner surface of the shell;

an elastic member; the elastic piece exerts an elastic force on the sliding piece, and the elastic force is directed to the plugging piece;

a trigger; the trigger is in transmission connection with the sliding piece; the trigger has a first position and a second position;

the sliding part has a first state of abutting against the block piece and closing the second channel and a second state of leaving the block piece and opening the second channel;

the trigger can move from the first position to the second position to drive the sliding piece to compress the elastic piece and change from the first state to the second state;

the sprayer also comprises a handle which is fixedly connected to the outer wall of the shell;

when the trigger is in the first position, the trigger is remote from the handle; when the trigger is in the second position, the trigger is proximate to the handle;

2. The spray head of claim 1, further comprising a snap; the clamping piece is connected with the handle, and when the trigger is located at the second position, the trigger is clamped with the handle through the clamping piece.

3. The spray head of claim 1, wherein:

the connecting ring is sleeved on the outer side of the outer peripheral surface of the shell; the inner surface of the connecting ring and the outer peripheral surface of the shell are mutually spaced; the connecting block is rotatably connected with the shell;

the hinge blocks positioned on the two sides of the connecting ring are respectively connected with a connecting pin;

4. The spray head of claim 3, wherein:

the shell is connected with a base, and the connecting block is rotatably connected with the shell through the base; the connecting block or the base is provided with a sliding hole, and the connecting block or the base is rotatably connected through a pin shaft penetrating through the sliding hole; the size of the cross section of the sliding hole is larger than that of the cross section of the pin shaft.

5. The spray head according to any one of claims 1 to 4, wherein:

6. The spray head of claim 5, wherein:

the supporting piece is of an annular structure, and the outer peripheral surface of the supporting piece is in sealing fit with the inner peripheral surface of the first channel; the support member has a fitting hole extending in the first passage axis direction, and an outer surface of the slide member is slidably and sealingly fitted in the fitting hole.

7. The spray head of claim 6, wherein:

one end of the matching hole close to the first end is provided with a limiting ring which protrudes inwards along the radial direction;

the elastic piece is located in the matching hole and supported between the limiting ring and the sliding piece.

8. A fire-fighting lance comprising a nozzle as claimed in any one of claims 1 to 7, said lance further comprising a conduit and a connector;

the pipeline passes through the connecting piece is connected the first end of casing, just the pipeline intercommunication the second passageway of slider.