CN211613106U

CN211613106U - Nozzle-adjusting desuperheater

Info

Publication number: CN211613106U
Application number: CN202020106206.3U
Authority: CN
Inventors: 袁宗久; 王连飞; 刘畅; 孙宇; 刘啸; 辛莘; 李林; 冀秀艳; 赵洪宇; 贾鲁男
Original assignee: Shenyang Jiuhe Fluid Technology Co ltd
Current assignee: Shenyang Jiuhe Fluid Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-10-02
Anticipated expiration: 2030-01-17

Abstract

A nozzle-adjusting desuperheater solves the problems that the existing desuperheater is too high in local position pressure, easy to scour and generate internal cavitation, easy to damage internal elements and uneven in nozzle atomization. Including the inside nozzle valve body that is provided with the desuperheating water chamber, its characterized in that: a plurality of groups of flow equalizing holes are formed in the side wall of the upper end of the flow equalizing bush in the temperature reducing water cavity of the nozzle valve body; an annular flow equalizing cavity arranged outside the flow equalizing hole is connected with a temperature reducing water connecting pipe on the side wall of the nozzle valve body; a regulating valve core is arranged at the upper part of the flow equalizing lining, and a sealing valve cover plate is arranged above the regulating valve core and at the upper end of the nozzle valve body; the lower part of the flow equalizing bush and the lower end of the nozzle valve body are provided with a micro-control nozzle. The high-temperature-resistant pipeline has the advantages of reasonable design, compact structure, capability of eliminating large temperature fluctuation, preventing two high and low temperature media from flowing, reducing the pipeline deformation phenomenon caused by overhigh temperature of the media, ensuring the use safety of the pipeline, occupying small space and effectively saving equipment cost.

Description

Nozzle-adjusting desuperheater

Technical Field

The utility model belongs to the technical field of the desuperheater, concretely relates to can eliminate great temperature and float, prevent that two kinds of high low temperature medium from flowing scurrying, reduce because of the pipeline deformation phenomenon that the medium high temperature leads to, guarantee the safe in utilization of pipeline, occupation space is little, can effectively practice thrift equipment cost's adjusting nozzle desuperheater.

Background

The temperature of the superheated steam is the highest temperature in a boiler system, and the overhigh steam temperature can reduce the strength of metal on the pipe wall of the superheater, easily cause the damage of the high-temperature section of the superheater and seriously affect the safe operation of the boiler. The desuperheater is generally applied to temperature reduction of a primary-secondary superheater and a reheater, a temperature reduction section of a steam turbine bypass system, a temperature reduction section in a desuperheater and other media, and is mainly used for controlling the front and rear temperatures of the media, adjusting the pressure of the desuperheating media and the flow of the desuperheating media, controlling the atomization effect of the desuperheating media and preventing the media from flowing back to the desuperheating media.

However, the existing structure of the desuperheater has too high pressure at local position, and the internal components are easy to damage; when the steam pipeline does not need temperature reduction, the temperature reduction water regulating valve is in a closed state, and steam is easy to enter the temperature reduction water pipeline because of high pressure; meanwhile, the common material of the temperature-reducing water pipeline cannot bear the temperature of steam, so that the metal strength of the pipe wall is reduced, the pipeline is cracked or the welding seam is cracked, and the safety of the unit equipment and the adjacent pipeline is damaged. In addition, the phenomena of scouring and internal cavitation are easy to occur in the process that the desuperheater water enters the nozzle valve of the desuperheater; moreover, because the desuperheating water can not flow uniformly when entering the nozzle cavity, the conditions of uneven atomization of the nozzle and unstable steam temperature at the outlet of the superheater can not be met, and the heat efficiency and the safety of the steam turbine are seriously affected. There is a need for an improved desuperheating device for reducing the temperature of a duct medium from a higher temperature to a temperature at which the apparatus is used.

SUMMERY OF THE UTILITY MODEL

The utility model discloses just to above-mentioned problem, provide one kind and can eliminate great temperature and float, prevent that two kinds of high low temperature medium from flowing scurrying, reduce because of the pipeline deformation phenomenon that the medium temperature is too high to result in, guarantee the safe in utilization of pipeline, occupation space is little, can effectively practice thrift equipment cost's regulation nozzle desuperheater.

The utility model adopts the technical proposal that: this adjust nozzle desuperheater is including setting up the nozzle valve body on the steam conduit pipe wall, its characterized in that: a temperature-reducing water cavity which is communicated up and down is arranged inside the nozzle valve body, a flow-equalizing bushing is arranged in the temperature-reducing water cavity of the nozzle valve body, a plurality of groups of flow-equalizing holes are arranged on the side wall of the upper end of the flow-equalizing bushing, an annular flow-equalizing cavity is arranged outside the flow-equalizing holes, and the annular flow-equalizing cavity is connected with a temperature-reducing water connecting pipe arranged on the side wall of the nozzle valve body; the upper part of the flow equalizing bush is provided with a regulating valve core, a sealing valve cover plate is arranged above the regulating valve core and at the upper end of the nozzle valve body, and a flow stabilizing cavity is arranged below the regulating valve core and in the middle of the inner side of the flow equalizing bush; the lower part of the flow equalizing bush and the lower end of the nozzle valve body are also provided with a micro-control nozzle, a flow guide cavity is arranged between the liquid inlet end of the micro-control nozzle and the inner side wall of the lower part of the flow equalizing bush, and the liquid outlet end of the micro-control nozzle is positioned outside the lower end of the nozzle valve body.

The regulating valve core arranged at the upper part of the flow equalizing bush is composed of an inverted-cone-shaped fluid characteristic valve core, a connecting body is arranged at the upper end of the fluid characteristic valve core, and an adjusting bolt which is vertically arranged is arranged at the upper part of the connecting body; the regulating valve core is movably arranged on the sealing valve cover plate through an adjusting bolt. The flow entering the nozzle valve body temperature reduction water cavity is adjusted and the pressure is controlled by adjusting and controlling the valve core to move up and down along the adjusting bolt; meanwhile, the inverted cone-shaped fluid characteristic valve core also plays a role in effective diversion, so that steam is forced to flow rapidly within a certain range, and the purpose of mixing and cooling is achieved.

The sealing valve cover plate arranged at the upper end of the nozzle valve body is composed of a cover plate main body, a valve core adjusting through hole is formed in the middle of the cover plate main body, and a valve core guide clamping groove is formed in the cover plate main body, and faces to the lower side of the nozzle valve body temperature reduction water cavity; the adjusting bolt at the upper part of the regulating valve core is movably inserted in the valve core adjusting through hole of the sealing valve cover plate, and the position of the regulating valve core is fixed by using an adjusting nut; meanwhile, the sealing valve cover plate is fixedly arranged at the upper end of the nozzle valve body through the stud bolts arranged in the connecting bolt holes. The adjusting nut is used for enabling the adjusting bolt of the adjusting valve core to flexibly lift along the valve core adjusting through hole in the middle of the sealing valve cover plate, so that the adjusting valve core is driven to move up and down in the valve core guiding clamping groove, and flow adjustment and pressure control of fluid entering the nozzle valve body temperature reduction water cavity are achieved.

The cover plate main body of the sealing valve cover plate is provided with a vent hole communicated with the valve core guide clamping groove; the vent hole is located the one end of apron main part upside, still is provided with sealed locking screw. Air is injected into the valve core guide clamping groove on the lower side of the sealing valve cover plate by utilizing the vent hole, so that a vacuum cavity formed between the upper end surface of the control valve core and the valve core guide clamping groove in the process of controlling the valve core to move up and down is eliminated, and the phenomenon that the control valve core cannot move normally due to the vacuum cavity is avoided.

The micro-control nozzle is composed of a sliding sleeve positioned in a flow guide cavity at the lower part of the flow equalizing bush, a nozzle valve core which is vertically arranged is fixedly arranged at the middle part of the sliding sleeve, and a fixed spray head which is fixedly connected with the lower end of the flow equalizing bush is sleeved at the lower end of the nozzle valve core; and a disk spring is arranged between the fixed spray head and the sliding sleeve which are mutually inserted. The nozzle valve core and the sliding sleeve are flushed away by utilizing the functions of the temperature reduction water pressure and the flow and overcoming the elasticity of the disc spring, so that the medium in the steam pipeline is cooled.

The fixed sprayer is composed of a sprayer main body, the outer side of the sprayer main body is provided with a fixed thread used for being connected with the inner wall of the flow equalizing bush, the middle part of the sprayer main body is provided with a valve core telescopic hole, the lower end of the valve core telescopic hole is provided with a liquid spraying cavity, and the lower end of the liquid spraying cavity is provided with a horn-shaped liquid spraying outlet; a plurality of groups of flow guide holes communicated with the liquid spraying cavity are also arranged on the spray head main body and on the periphery of the outer side of the valve core telescopic hole; the valve core rod of the nozzle valve core penetrates through the valve core telescopic hole of the fixed spray head, the upper end of the valve core rod is connected with the sliding sleeve through a valve core fixing screw, and the linear sealing plug at the lower end of the valve core rod is matched and connected with the horn-shaped liquid spray outlet at the lower end of the fixed spray head. The atomizing effect of the desuperheating water is improved by increasing the flow speed of the desuperheating water, and the linear sealing plug at the lower end of the nozzle valve core is sealed with the linear of the horn-shaped liquid spraying outlet of the fixed spray head, so that the steam is effectively prevented from flowing backwards into the desuperheating water cavity of the nozzle valve body, the performance of metal materials in the desuperheater is prevented from being damaged by the steam, and the service life is prolonged.

The utility model has the advantages that: because the utility model adopts the nozzle valve body which is internally provided with the temperature-reducing water cavity which is communicated up and down, a plurality of groups of flow-equalizing holes are arranged on the side wall of the upper end of the flow-equalizing bush in the temperature-reducing water cavity of the nozzle valve body; an annular flow equalizing cavity is arranged outside the flow equalizing hole and is connected with a temperature reducing water connecting pipe arranged on the side wall of the nozzle valve body; the upper part of the flow equalizing bush is provided with a regulating valve core, a sealing valve cover plate is arranged above the regulating valve core and at the upper end of the nozzle valve body, and a flow stabilizing cavity is arranged below the regulating valve core and in the middle of the inner side of the flow equalizing bush; the lower part of the bush that flow equalizes, the lower extreme of nozzle valve body, still be provided with the micro-control nozzle, be provided with the water conservancy diversion chamber between the feed liquor end of micro-control nozzle and the inside wall of the bush lower part that flow equalizes, the play liquid end of micro-control nozzle is located the outside structural style of nozzle valve body lower extreme, so its reasonable in design, moreover, the steam generator is compact in structure, can eliminate great temperature and float, prevent that two kinds of high low temperature medium from flowing scurrying, reduce the pipeline deformation that leads to because of medium high temperature, impaired phenomenon, guarantee the safe in utilization of pipeline, the required installation space of device is little, and can effectively practice.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of an internal structure of the nozzle valve body of fig. 1.

Fig. 3 is a schematic diagram of a structure of the micro-control nozzle of fig. 2.

Fig. 4 is a schematic structural view of the fixed nozzle of fig. 3.

Fig. 5 is a schematic diagram of a construction of the regulator valve cartridge of fig. 2.

Fig. 6 is a schematic view of a structure of the sealing valve cover plate in fig. 2.

The sequence numbers in the figures illustrate: 1 steam pipeline, 2 nozzle valve body, 3 flow equalizing bush, 4 sealing valve cover plate, 5 regulating valve core, 6 temperature reducing water connecting pipe, 7 temperature reducing water inlet, 8 micro-control nozzle, 9 steam inlet, 10 steam outlet, 11 annular flow equalizing cavity, 12 flow equalizing hole, 13 flow stabilizing cavity, 14 flow guiding cavity, 15 vacuum cavity, 16 adjusting nut, 17 leakage preventing sealing ring, 18 temperature reducing water cavity sealing ring, 19 sliding sleeve, 20 fixed spray head, the spray head comprises a flow guide hole 21, a liquid spray cavity 22, a nozzle valve core 23, a valve core rod 24, a valve core fixing screw 25, a linear sealing plug 26, a disc spring 27, a spray head main body 28, a fixed thread 29, a valve core telescopic hole 30, a trumpet-shaped liquid spray outlet 31, a connecting body 32, a fluid characteristic valve core 33, an adjusting bolt 34, a cover plate main body 35, a valve core adjusting through hole 36, a valve core guide clamping groove 37, a vent hole 38, a connecting bolt hole 39 and a sealing locking screw 40.

Detailed Description

The specific structure of the present invention is described in detail with reference to fig. 1 to 6. The nozzle-regulated desuperheater comprises a nozzle valve body 2 arranged on the pipe wall of a steam pipeline 1, superheated steam enters the steam pipeline 1 through a steam inlet 9 and is discharged from a steam outlet 10. The interior of the nozzle valve body 2 is provided with a desuperheating water cavity which is communicated up and down, and the desuperheating water cavity of the nozzle valve body 2 is provided with a cylindrical flow equalizing bush 3 for shunting desuperheating water. A plurality of groups of flow equalizing holes 12 are formed in the side wall of the upper end of the flow equalizing bush 3, an annular flow equalizing cavity 11 is formed outside the flow equalizing holes 12, and the annular flow equalizing cavity 11 is connected with a temperature reducing water connecting pipe 6 arranged on the side wall of the nozzle valve body 2; so as to effectively counteract the scouring of the temperature-reducing water to the internal structural parts of the nozzle valve body 2 by utilizing the flow-equalizing bush 3.

The upper portion of the flow equalizing bush 3 is provided with a regulating valve core 5, the regulating valve core 5 is composed of an inverted-cone-shaped fluid characteristic valve core 33, the upper end of the fluid characteristic valve core 33 is provided with a connecting body 32, and the upper portion of the connecting body 32 is provided with an adjusting bolt 34 which is vertically arranged. A sealing valve cover plate 4 is arranged above the regulating valve core 5 and at the upper end of the nozzle valve body 2, the sealing valve cover plate 4 is composed of a cover plate main body 35, a valve core regulating through hole 36 is arranged in the middle of the cover plate main body 35, and a valve core guide clamping groove 37 is arranged on the lower side, facing the temperature reduction water cavity of the nozzle valve body 2, of the cover plate main body 35. An adjusting bolt 34 at the upper part of the regulating valve core 5 is movably inserted in a valve core adjusting through hole 36 of the sealing valve cover plate 4, and the position of the regulating valve core 5 is fixed by an adjusting nut 16; meanwhile, the sealing valve cover plate 4 is fixedly provided at the upper end of the nozzle valve body 2 by means of stud bolts provided in the connecting bolt holes 39. Therefore, the adjusting nut 16 is used to flexibly lift the adjusting bolt 34 of the regulating valve core 5 along the valve core adjusting through hole 36 in the middle of the sealing valve cover plate 4, so as to drive the regulating valve core 5 to move up and down in the valve core guide clamping groove 37, thereby realizing the flow regulation and pressure control of the desuperheating water entering the desuperheating water cavity of the nozzle valve body 2. Meanwhile, the inverted cone-shaped fluid characteristic valve core 33 also plays a role in effective diversion so as to force the steam to flow rapidly within a certain range, achieve the purpose of mixing and cooling, and does not influence the change of the pressure of the rear section of the pipeline.

In order to avoid the phenomenon that the regulating valve core 5 cannot normally move due to the vacuum cavity 15, the cover plate main body 35 of the sealing valve cover plate 4 is provided with a vent hole 38 communicated with the valve core guide clamping groove 37. The vent hole 38 is positioned at one end of the upper side of the cover plate main body 35, and is also provided with a sealing locking screw 40; further, air is injected into the valve core guide notch 37 on the lower side of the sealing valve cover plate 4 through the vent hole 38, so that the vacuum chamber 15 formed between the upper end surface of the control valve core 5 and the valve core guide notch 37 in the process of moving the control valve core 5 up and down is eliminated. It can be understood that, according to specific use requirements, an anti-leakage sealing ring 17 for preventing the temperature-reduced water from leaking out is arranged between the upper end of the flow-equalizing bush 3 and the sealing valve cover plate 4; a temperature-reducing water cavity sealing ring 18 for preventing steam from entering the temperature-reducing water cavity is arranged at the position on the outer side of the middle part of the flow-equalizing lining 3 and below the annular flow-equalizing cavity 11.

And a flow stabilizing cavity 13 is arranged below the regulating valve core 5 at the upper part of the inner side of the nozzle valve body 2 and in the middle of the inner side of the flow equalizing bush 3. The lower part of the flow equalizing lining 3 and the lower end of the nozzle valve body 2 are provided with a micro-control nozzle 8, a flow guide cavity 14 is arranged between the liquid inlet end of the micro-control nozzle 8 and the inner side wall of the lower part of the flow equalizing lining 3, and the liquid outlet end of the micro-control nozzle 8 is positioned outside the lower end of the nozzle valve body 2. The micro-control nozzle 8 is composed of a sliding sleeve 19 positioned in a flow guide cavity 14 at the lower part of the flow equalizing bush 3; the middle part of the sliding sleeve 19 is fixedly provided with a vertically arranged nozzle valve core 23, and the lower end of the nozzle valve core 23 is sleeved with a fixed spray head 20 which is fixedly connected with the lower end of the flow equalizing bush 3 by using a fixed thread 29. A disc spring 27 is arranged between the fixed nozzle 20 and the sliding sleeve 19 which are inserted with each other; so as to overcome the elasticity of the disc spring 27 by utilizing the functions of the temperature-reducing water pressure and the flow, and to flush the nozzle valve core 23 and the sliding sleeve 19, thereby reducing the temperature of the medium in the steam pipeline 1.

The fixed nozzle 20 of the micro-control nozzle 8 is composed of a nozzle main body 28, the outer side of the nozzle main body 28 is provided with a fixed thread 29 for connecting with the inner wall of the flow equalizing bush 3, the middle part of the nozzle main body 28 is provided with a valve core telescopic hole 30, the lower end of the valve core telescopic hole 30 is provided with a liquid spraying cavity 22, and the lower end of the liquid spraying cavity 22 is provided with a horn-shaped liquid spraying outlet 31; the nozzle main body 28 and the periphery of the outer side of the valve core telescopic hole 30 are also provided with a plurality of groups of flow guide holes 21 communicated with the liquid spray cavity 22. A valve core rod 24 of the nozzle valve core 23 penetrates through a valve core telescopic hole 30 of the fixed spray head 20, and the upper end of the valve core rod 24 is connected with the sliding sleeve 19 through a valve core fixing screw 25; the linear sealing plug 26 at the lower end of the valve core rod 24 of the nozzle valve core 23 is matched and connected with the trumpet-shaped spray outlet 31 at the lower end of the fixed spray head 20. And then increase the velocity of flow of desuperheating water, promote the atomization effect of desuperheating water, and seal with the line type of the spray outlet 31 of the horn shape of the fixed spray head 20 through the line type of the line type seal end cap 26 of the lower end of the valve core 23 of the spray nozzle, prevent the steam from flowing backwards into the desuperheating water cavity of the valve body 2 of the spray nozzle, prevent the performance of the metal material in the desuperheater of the destruction of steam, lengthen life time.

When the temperature reducer with the adjusting nozzle is used, firstly, the temperature reducing water enters the temperature reducing water connecting pipe 6 through the temperature reducing water inlet 7, then the temperature reducing water enters the flow stabilizing cavity 13 of the flow equalizing bush 3 through the annular flow equalizing cavity 11 and the flow equalizing hole 12, meanwhile, the adjusting valve core 5 arranged on the upper portion of the flow equalizing bush 3 conducts flow guiding on the temperature reducing water entering the temperature reducing water cavity of the nozzle valve body 2, the flow and the pressure of the temperature reducing water are effectively adjusted and controlled, steam is forced to flow rapidly within a certain range, and the purpose of mixed cooling is achieved. Then, the desuperheating water enters the liquid spraying cavity 22 of the fixed nozzle 20 of the micro-control nozzle 8 through the flow guide hole 21, the opening stroke of the nozzle valve core 23 and the fixed nozzle 20 is reduced under the action of desuperheating water pressure and flow and the action of overcoming the elasticity of the disc spring 27, and the reverse pressure formed by the disc spring 27 pressed by the sliding sleeve 19 is reduced, so that the area between the nozzle valve core 23 and the fixed nozzle 20 through which the desuperheating water flows is smaller, the flow rate of the desuperheating water is increased, the desuperheating water achieves the atomization effect, and the medium in the steam pipeline 1 is cooled.

Claims

1. The utility model provides an adjust nozzle desuperheater, includes nozzle valve body (2) of setting on steam conduit (1) pipe wall, its characterized in that: a temperature-reducing water cavity which is communicated up and down is arranged in the nozzle valve body (2), a flow-equalizing bushing (3) is arranged in the temperature-reducing water cavity of the nozzle valve body (2), a plurality of groups of flow-equalizing holes (12) are arranged on the side wall of the upper end of the flow-equalizing bushing (3), an annular flow-equalizing cavity (11) is arranged outside the flow-equalizing holes (12), and the annular flow-equalizing cavity (11) is connected with a temperature-reducing water connecting pipe (6) arranged on the side wall of the nozzle valve body (2); a regulating valve core (5) is arranged at the upper part of the flow equalizing lining (3), a sealing valve cover plate (4) is arranged above the regulating valve core (5) and at the upper end of the nozzle valve body (2), and a flow stabilizing cavity (13) is arranged below the regulating valve core (5) and in the middle of the inner side of the flow equalizing lining (3); the lower part of the flow equalizing lining (3) and the lower end of the nozzle valve body (2) are also provided with a micro-control nozzle (8), a flow guide cavity (14) is arranged between the liquid inlet end of the micro-control nozzle (8) and the inner side wall of the lower part of the flow equalizing lining (3), and the liquid outlet end of the micro-control nozzle (8) is positioned outside the lower end of the nozzle valve body (2).

2. The regulated nozzle desuperheater of claim 1, wherein: the regulating valve core (5) arranged at the upper part of the flow equalizing bush (3) is composed of an inverted-cone-shaped fluid characteristic valve core (33), a connecting body (32) is arranged at the upper end of the fluid characteristic valve core (33), and an adjusting bolt (34) which is vertically arranged is arranged at the upper part of the connecting body (32); the regulating valve core (5) is movably arranged on the sealing valve cover plate (4) through an adjusting bolt (34).

3. The regulated nozzle desuperheater of claim 2, wherein: the sealing valve cover plate (4) arranged at the upper end of the nozzle valve body (2) is composed of a cover plate main body (35), a valve core adjusting through hole (36) is formed in the middle of the cover plate main body (35), and a valve core guide clamping groove (37) is formed in the position, facing the lower side of the temperature reduction water cavity of the nozzle valve body (2), of the cover plate main body (35); an adjusting bolt (34) at the upper part of the regulating valve core (5) is movably inserted in a valve core adjusting through hole (36) of the sealing valve cover plate (4), and the position of the regulating valve core (5) is fixed by an adjusting nut (16); meanwhile, the sealing valve cover plate (4) is fixedly arranged at the upper end of the nozzle valve body (2) through a stud bolt arranged in the connecting bolt hole (39).

4. The regulated nozzle desuperheater of claim 3, wherein: a vent hole (38) communicated with the valve core guide clamping groove (37) is formed in the cover plate main body (35) of the sealing valve cover plate (4); the vent hole (38) is positioned at one end of the upper side of the cover plate main body (35) and is also provided with a sealing locking screw (40).

5. The regulated nozzle desuperheater of claim 1, wherein: the micro-control nozzle (8) is composed of a sliding sleeve (19) positioned in a flow guide cavity (14) at the lower part of the flow equalizing bush (3), a nozzle valve core (23) which is vertically arranged is fixedly arranged in the middle of the sliding sleeve (19), and a fixed spray head (20) which is fixedly connected with the lower end of the flow equalizing bush (3) is sleeved at the lower end of the nozzle valve core (23); a disc spring (27) is provided between the fixed head (20) and the sliding sleeve (19) which are inserted into each other.

6. The regulated nozzle desuperheater of claim 5, wherein: the fixed spray head (20) is composed of a spray head main body (28), a fixed thread (29) used for being connected with the inner wall of the flow equalizing bush (3) is arranged on the outer side of the spray head main body (28), a valve core telescopic hole (30) is arranged in the middle of the spray head main body (28), a liquid spraying cavity (22) is arranged at the lower end of the valve core telescopic hole (30), and a horn-shaped liquid spraying outlet (31) is arranged at the lower end of the liquid spraying cavity (22); a plurality of groups of flow guide holes (21) communicated with the liquid spray cavity (22) are also arranged on the spray head main body (28) and on the periphery of the outer side of the valve core telescopic hole (30); a valve core rod (24) of the nozzle valve core (23) penetrates through a valve core telescopic hole (30) of the fixed spray head (20), the upper end of the valve core rod (24) is connected with the sliding sleeve (19) through a valve core fixing screw (25), and a linear sealing plug (26) at the lower end of the valve core rod (24) is matched and connected with a horn-shaped spray liquid outlet (31) at the lower end of the fixed spray head (20).